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 /*
  31  * This file is part of Lustre, http://www.lustre.org/
  32  * Lustre is a trademark of Sun Microsystems, Inc.
  33  *
  34  * lnet/klnds/o2iblnd/o2iblnd_cb.c
  35  *
  36  * Author: Eric Barton <eric@bartonsoftware.com>
  37  */
  38
  39 #include "o2iblnd.h"
  40
  41 void
  42 kiblnd_tx_done (lnet_ni_t *ni, kib_tx_t *tx)
  43 {
  44         lnet_msg_t *lntmsg[2];
  45         kib_net_t  *net = ni->ni_data;
  46         int         rc;
  47         int         i;
  48
  49         LASSERT (net != NULL);
  50         LASSERT (!cfs_in_interrupt());
  51         LASSERT (!tx->tx_queued);               /* mustn't be queued for sending */
  52         LASSERT (tx->tx_sending == 0);          /* mustn't be awaiting sent callback */
  53         LASSERT (!tx->tx_waiting);              /* mustn't be awaiting peer response */
  54         LASSERT (tx->tx_pool != NULL);
  55
  56         kiblnd_unmap_tx(ni, tx);
  57
  58         /* tx may have up to 2 lnet msgs to finalise */
  59         lntmsg[0] = tx->tx_lntmsg[0]; tx->tx_lntmsg[0] = NULL;
  60         lntmsg[1] = tx->tx_lntmsg[1]; tx->tx_lntmsg[1] = NULL;
  61         rc = tx->tx_status;
  62
  63         if (tx->tx_conn != NULL) {
  64                 LASSERT (ni == tx->tx_conn->ibc_peer->ibp_ni);
  65
  66                 kiblnd_conn_decref(tx->tx_conn);
  67                 tx->tx_conn = NULL;
  68         }
  69
  70         tx->tx_nwrq = 0;
  71         tx->tx_status = 0;
  72
  73         kiblnd_pool_free_node(&tx->tx_pool->tpo_pool, &tx->tx_list);
  74
  75         /* delay finalize until my descs have been freed */
  76         for (i = 0; i < 2; i++) {
  77                 if (lntmsg[i] == NULL)
  78                         continue;
  79
  80                 lnet_finalize(ni, lntmsg[i], rc);
  81         }
  82 }
  83
  84 void
  85 kiblnd_txlist_done (lnet_ni_t *ni, cfs_list_t *txlist, int status)
  86 {
  87         kib_tx_t *tx;
  88
  89         while (!cfs_list_empty (txlist)) {
  90                 tx = cfs_list_entry (txlist->next, kib_tx_t, tx_list);
  91
  92                 cfs_list_del(&tx->tx_list);
  93                 /* complete now */
  94                 tx->tx_waiting = 0;
  95                 tx->tx_status = status;
  96                 kiblnd_tx_done(ni, tx);
  97         }
  98 }
  99
 100 kib_tx_t *
 101 kiblnd_get_idle_tx(lnet_ni_t *ni, lnet_nid_t target)
 102 {
 103         kib_net_t               *net = (kib_net_t *)ni->ni_data;
 104         cfs_list_t              *node;
 105         kib_tx_t                *tx;
 106         kib_tx_poolset_t        *tps;
 107
 108         tps = net->ibn_tx_ps[lnet_cpt_of_nid(target)];
 109         node = kiblnd_pool_alloc_node(&tps->tps_poolset);
 110         if (node == NULL)
 111                 return NULL;
 112         tx = container_of(node, kib_tx_t, tx_list);
 113
 114         LASSERT (tx->tx_nwrq == 0);
 115         LASSERT (!tx->tx_queued);
 116         LASSERT (tx->tx_sending == 0);
 117         LASSERT (!tx->tx_waiting);
 118         LASSERT (tx->tx_status == 0);
 119         LASSERT (tx->tx_conn == NULL);
 120         LASSERT (tx->tx_lntmsg[0] == NULL);
 121         LASSERT (tx->tx_lntmsg[1] == NULL);
 122         LASSERT (tx->tx_u.pmr == NULL);
 123         LASSERT (tx->tx_nfrags == 0);
 124
 125         return tx;
 126 }
 127
 128 void
 129 kiblnd_drop_rx(kib_rx_t *rx)
 130 {
 131         kib_conn_t              *conn   = rx->rx_conn;
 132         struct kib_sched_info   *sched  = conn->ibc_sched;
 133         unsigned long           flags;
 134
 135         spin_lock_irqsave(&sched->ibs_lock, flags);
 136         LASSERT(conn->ibc_nrx > 0);
 137         conn->ibc_nrx--;
 138         spin_unlock_irqrestore(&sched->ibs_lock, flags);
 139
 140         kiblnd_conn_decref(conn);
 141 }
 142
 143 int
 144 kiblnd_post_rx (kib_rx_t *rx, int credit)
 145 {
 146         kib_conn_t         *conn = rx->rx_conn;
 147         kib_net_t          *net = conn->ibc_peer->ibp_ni->ni_data;
 148         struct ib_recv_wr  *bad_wrq = NULL;
 149         struct ib_mr       *mr;
 150         int                 rc;
 151
 152         LASSERT (net != NULL);
 153         LASSERT (!cfs_in_interrupt());
 154         LASSERT (credit == IBLND_POSTRX_NO_CREDIT ||
 155                  credit == IBLND_POSTRX_PEER_CREDIT ||
 156                  credit == IBLND_POSTRX_RSRVD_CREDIT);
 157
 158         mr = kiblnd_find_dma_mr(conn->ibc_hdev, rx->rx_msgaddr, IBLND_MSG_SIZE);
 159         LASSERT (mr != NULL);
 160
 161         rx->rx_sge.lkey   = mr->lkey;
 162         rx->rx_sge.addr   = rx->rx_msgaddr;
 163         rx->rx_sge.length = IBLND_MSG_SIZE;
 164
 165         rx->rx_wrq.next = NULL;
 166         rx->rx_wrq.sg_list = &rx->rx_sge;
 167         rx->rx_wrq.num_sge = 1;
 168         rx->rx_wrq.wr_id = kiblnd_ptr2wreqid(rx, IBLND_WID_RX);
 169
 170         LASSERT (conn->ibc_state >= IBLND_CONN_INIT);
 171         LASSERT (rx->rx_nob >= 0);              /* not posted */
 172
 173         if (conn->ibc_state > IBLND_CONN_ESTABLISHED) {
 174                 kiblnd_drop_rx(rx);             /* No more posts for this rx */
 175                 return 0;
 176         }
 177
 178         rx->rx_nob = -1;                        /* flag posted */
 179
 180         rc = ib_post_recv(conn->ibc_cmid->qp, &rx->rx_wrq, &bad_wrq);
 181         if (rc != 0) {
 182                 CERROR("Can't post rx for %s: %d, bad_wrq: %p\n",
 183                        libcfs_nid2str(conn->ibc_peer->ibp_nid), rc, bad_wrq);
 184                 rx->rx_nob = 0;
 185         }
 186
 187         if (conn->ibc_state < IBLND_CONN_ESTABLISHED) /* Initial post */
 188                 return rc;
 189
 190         if (rc != 0) {
 191                 kiblnd_close_conn(conn, rc);
 192                 kiblnd_drop_rx(rx);             /* No more posts for this rx */
 193                 return rc;
 194         }
 195
 196         if (credit == IBLND_POSTRX_NO_CREDIT)
 197                 return 0;
 198
 199         spin_lock(&conn->ibc_lock);
 200         if (credit == IBLND_POSTRX_PEER_CREDIT)
 201                 conn->ibc_outstanding_credits++;
 202         else
 203                 conn->ibc_reserved_credits++;
 204         spin_unlock(&conn->ibc_lock);
 205
 206         kiblnd_check_sends(conn);
 207         return 0;
 208 }
 209
 210 kib_tx_t *
 211 kiblnd_find_waiting_tx_locked(kib_conn_t *conn, int txtype, __u64 cookie)
 212 {
 213         cfs_list_t   *tmp;
 214
 215         cfs_list_for_each(tmp, &conn->ibc_active_txs) {
 216                 kib_tx_t *tx = cfs_list_entry(tmp, kib_tx_t, tx_list);
 217
 218                 LASSERT (!tx->tx_queued);
 219                 LASSERT (tx->tx_sending != 0 || tx->tx_waiting);
 220
 221                 if (tx->tx_cookie != cookie)
 222                         continue;
 223
 224                 if (tx->tx_waiting &&
 225                     tx->tx_msg->ibm_type == txtype)
 226                         return tx;
 227
 228                 CWARN("Bad completion: %swaiting, type %x (wanted %x)\n",
 229                       tx->tx_waiting ? "" : "NOT ",
 230                       tx->tx_msg->ibm_type, txtype);
 231         }
 232         return NULL;
 233 }
 234
 235 void
 236 kiblnd_handle_completion(kib_conn_t *conn, int txtype, int status, __u64 cookie)
 237 {
 238         kib_tx_t    *tx;
 239         lnet_ni_t   *ni = conn->ibc_peer->ibp_ni;
 240         int          idle;
 241
 242         spin_lock(&conn->ibc_lock);
 243
 244         tx = kiblnd_find_waiting_tx_locked(conn, txtype, cookie);
 245         if (tx == NULL) {
 246                 spin_unlock(&conn->ibc_lock);
 247
 248                 CWARN("Unmatched completion type %x cookie "LPX64" from %s\n",
 249                       txtype, cookie, libcfs_nid2str(conn->ibc_peer->ibp_nid));
 250                 kiblnd_close_conn(conn, -EPROTO);
 251                 return;
 252         }
 253
 254         if (tx->tx_status == 0) {               /* success so far */
 255                 if (status < 0) {               /* failed? */
 256                         tx->tx_status = status;
 257                 } else if (txtype == IBLND_MSG_GET_REQ) {
 258                         lnet_set_reply_msg_len(ni, tx->tx_lntmsg[1], status);
 259                 }
 260         }
 261
 262         tx->tx_waiting = 0;
 263
 264         idle = !tx->tx_queued && (tx->tx_sending == 0);
 265         if (idle)
 266                 cfs_list_del(&tx->tx_list);
 267
 268         spin_unlock(&conn->ibc_lock);
 269
 270         if (idle)
 271                 kiblnd_tx_done(ni, tx);
 272 }
 273
 274 void
 275 kiblnd_send_completion(kib_conn_t *conn, int type, int status, __u64 cookie)
 276 {
 277         lnet_ni_t   *ni = conn->ibc_peer->ibp_ni;
 278         kib_tx_t    *tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
 279
 280         if (tx == NULL) {
 281                 CERROR("Can't get tx for completion %x for %s\n",
 282                        type, libcfs_nid2str(conn->ibc_peer->ibp_nid));
 283                 return;
 284         }
 285
 286         tx->tx_msg->ibm_u.completion.ibcm_status = status;
 287         tx->tx_msg->ibm_u.completion.ibcm_cookie = cookie;
 288         kiblnd_init_tx_msg(ni, tx, type, sizeof(kib_completion_msg_t));
 289
 290         kiblnd_queue_tx(tx, conn);
 291 }
 292
 293 void
 294 kiblnd_handle_rx (kib_rx_t *rx)
 295 {
 296         kib_msg_t    *msg = rx->rx_msg;
 297         kib_conn_t   *conn = rx->rx_conn;
 298         lnet_ni_t    *ni = conn->ibc_peer->ibp_ni;
 299         int           credits = msg->ibm_credits;
 300         kib_tx_t     *tx;
 301         int           rc = 0;
 302         int           rc2;
 303         int           post_credit;
 304
 305         LASSERT (conn->ibc_state >= IBLND_CONN_ESTABLISHED);
 306
 307         CDEBUG (D_NET, "Received %x[%d] from %s\n",
 308                 msg->ibm_type, credits,
 309                 libcfs_nid2str(conn->ibc_peer->ibp_nid));
 310
 311         if (credits != 0) {
 312                 /* Have I received credits that will let me send? */
 313                 spin_lock(&conn->ibc_lock);
 314
 315                 if (conn->ibc_credits + credits >
 316                     IBLND_MSG_QUEUE_SIZE(conn->ibc_version)) {
 317                         rc2 = conn->ibc_credits;
 318                         spin_unlock(&conn->ibc_lock);
 319
 320                         CERROR("Bad credits from %s: %d + %d > %d\n",
 321                                libcfs_nid2str(conn->ibc_peer->ibp_nid),
 322                                rc2, credits,
 323                                IBLND_MSG_QUEUE_SIZE(conn->ibc_version));
 324
 325                         kiblnd_close_conn(conn, -EPROTO);
 326                         kiblnd_post_rx(rx, IBLND_POSTRX_NO_CREDIT);
 327                         return;
 328                 }
 329
 330                 conn->ibc_credits += credits;
 331
 332                 /* This ensures the credit taken by NOOP can be returned */
 333                 if (msg->ibm_type == IBLND_MSG_NOOP &&
 334                     !IBLND_OOB_CAPABLE(conn->ibc_version)) /* v1 only */
 335                         conn->ibc_outstanding_credits++;
 336
 337                 spin_unlock(&conn->ibc_lock);
 338                 kiblnd_check_sends(conn);
 339         }
 340
 341         switch (msg->ibm_type) {
 342         default:
 343                 CERROR("Bad IBLND message type %x from %s\n",
 344                        msg->ibm_type, libcfs_nid2str(conn->ibc_peer->ibp_nid));
 345                 post_credit = IBLND_POSTRX_NO_CREDIT;
 346                 rc = -EPROTO;
 347                 break;
 348
 349         case IBLND_MSG_NOOP:
 350                 if (IBLND_OOB_CAPABLE(conn->ibc_version)) {
 351                         post_credit = IBLND_POSTRX_NO_CREDIT;
 352                         break;
 353                 }
 354
 355                 if (credits != 0) /* credit already posted */
 356                         post_credit = IBLND_POSTRX_NO_CREDIT;
 357                 else              /* a keepalive NOOP */
 358                         post_credit = IBLND_POSTRX_PEER_CREDIT;
 359                 break;
 360
 361         case IBLND_MSG_IMMEDIATE:
 362                 post_credit = IBLND_POSTRX_DONT_POST;
 363                 rc = lnet_parse(ni, &msg->ibm_u.immediate.ibim_hdr,
 364                                 msg->ibm_srcnid, rx, 0);
 365                 if (rc < 0)                     /* repost on error */
 366                         post_credit = IBLND_POSTRX_PEER_CREDIT;
 367                 break;
 368
 369         case IBLND_MSG_PUT_REQ:
 370                 post_credit = IBLND_POSTRX_DONT_POST;
 371                 rc = lnet_parse(ni, &msg->ibm_u.putreq.ibprm_hdr,
 372                                 msg->ibm_srcnid, rx, 1);
 373                 if (rc < 0)                     /* repost on error */
 374                         post_credit = IBLND_POSTRX_PEER_CREDIT;
 375                 break;
 376
 377         case IBLND_MSG_PUT_NAK:
 378                 CWARN ("PUT_NACK from %s\n",
 379                        libcfs_nid2str(conn->ibc_peer->ibp_nid));
 380                 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
 381                 kiblnd_handle_completion(conn, IBLND_MSG_PUT_REQ,
 382                                          msg->ibm_u.completion.ibcm_status,
 383                                          msg->ibm_u.completion.ibcm_cookie);
 384                 break;
 385
 386         case IBLND_MSG_PUT_ACK:
 387                 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
 388
 389                 spin_lock(&conn->ibc_lock);
 390                 tx = kiblnd_find_waiting_tx_locked(conn, IBLND_MSG_PUT_REQ,
 391                                         msg->ibm_u.putack.ibpam_src_cookie);
 392                 if (tx != NULL)
 393                         cfs_list_del(&tx->tx_list);
 394                 spin_unlock(&conn->ibc_lock);
 395
 396                 if (tx == NULL) {
 397                         CERROR("Unmatched PUT_ACK from %s\n",
 398                                libcfs_nid2str(conn->ibc_peer->ibp_nid));
 399                         rc = -EPROTO;
 400                         break;
 401                 }
 402
 403                 LASSERT (tx->tx_waiting);
 404                 /* CAVEAT EMPTOR: I could be racing with tx_complete, but...
 405                  * (a) I can overwrite tx_msg since my peer has received it!
 406                  * (b) tx_waiting set tells tx_complete() it's not done. */
 407
 408                 tx->tx_nwrq = 0;                /* overwrite PUT_REQ */
 409
 410                 rc2 = kiblnd_init_rdma(conn, tx, IBLND_MSG_PUT_DONE,
 411                                        kiblnd_rd_size(&msg->ibm_u.putack.ibpam_rd),
 412                                        &msg->ibm_u.putack.ibpam_rd,
 413                                        msg->ibm_u.putack.ibpam_dst_cookie);
 414                 if (rc2 < 0)
 415                         CERROR("Can't setup rdma for PUT to %s: %d\n",
 416                                libcfs_nid2str(conn->ibc_peer->ibp_nid), rc2);
 417
 418                 spin_lock(&conn->ibc_lock);
 419                 tx->tx_waiting = 0;     /* clear waiting and queue atomically */
 420                 kiblnd_queue_tx_locked(tx, conn);
 421                 spin_unlock(&conn->ibc_lock);
 422                 break;
 423
 424         case IBLND_MSG_PUT_DONE:
 425                 post_credit = IBLND_POSTRX_PEER_CREDIT;
 426                 kiblnd_handle_completion(conn, IBLND_MSG_PUT_ACK,
 427                                          msg->ibm_u.completion.ibcm_status,
 428                                          msg->ibm_u.completion.ibcm_cookie);
 429                 break;
 430
 431         case IBLND_MSG_GET_REQ:
 432                 post_credit = IBLND_POSTRX_DONT_POST;
 433                 rc = lnet_parse(ni, &msg->ibm_u.get.ibgm_hdr,
 434                                 msg->ibm_srcnid, rx, 1);
 435                 if (rc < 0)                     /* repost on error */
 436                         post_credit = IBLND_POSTRX_PEER_CREDIT;
 437                 break;
 438
 439         case IBLND_MSG_GET_DONE:
 440                 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
 441                 kiblnd_handle_completion(conn, IBLND_MSG_GET_REQ,
 442                                          msg->ibm_u.completion.ibcm_status,
 443                                          msg->ibm_u.completion.ibcm_cookie);
 444                 break;
 445         }
 446
 447         if (rc < 0)                             /* protocol error */
 448                 kiblnd_close_conn(conn, rc);
 449
 450         if (post_credit != IBLND_POSTRX_DONT_POST)
 451                 kiblnd_post_rx(rx, post_credit);
 452 }
 453
 454 void
 455 kiblnd_rx_complete (kib_rx_t *rx, int status, int nob)
 456 {
 457         kib_msg_t    *msg = rx->rx_msg;
 458         kib_conn_t   *conn = rx->rx_conn;
 459         lnet_ni_t    *ni = conn->ibc_peer->ibp_ni;
 460         kib_net_t    *net = ni->ni_data;
 461         int           rc;
 462         int           err = -EIO;
 463
 464         LASSERT (net != NULL);
 465         LASSERT (rx->rx_nob < 0);               /* was posted */
 466         rx->rx_nob = 0;                         /* isn't now */
 467
 468         if (conn->ibc_state > IBLND_CONN_ESTABLISHED)
 469                 goto ignore;
 470
 471         if (status != IB_WC_SUCCESS) {
 472                 CNETERR("Rx from %s failed: %d\n",
 473                         libcfs_nid2str(conn->ibc_peer->ibp_nid), status);
 474                 goto failed;
 475         }
 476
 477         LASSERT (nob >= 0);
 478         rx->rx_nob = nob;
 479
 480         rc = kiblnd_unpack_msg(msg, rx->rx_nob);
 481         if (rc != 0) {
 482                 CERROR ("Error %d unpacking rx from %s\n",
 483                         rc, libcfs_nid2str(conn->ibc_peer->ibp_nid));
 484                 goto failed;
 485         }
 486
 487         if (msg->ibm_srcnid != conn->ibc_peer->ibp_nid ||
 488             msg->ibm_dstnid != ni->ni_nid ||
 489             msg->ibm_srcstamp != conn->ibc_incarnation ||
 490             msg->ibm_dststamp != net->ibn_incarnation) {
 491                 CERROR ("Stale rx from %s\n",
 492                         libcfs_nid2str(conn->ibc_peer->ibp_nid));
 493                 err = -ESTALE;
 494                 goto failed;
 495         }
 496
 497         /* set time last known alive */
 498         kiblnd_peer_alive(conn->ibc_peer);
 499
 500         /* racing with connection establishment/teardown! */
 501
 502         if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
 503                 rwlock_t  *g_lock = &kiblnd_data.kib_global_lock;
 504                 unsigned long  flags;
 505
 506                 write_lock_irqsave(g_lock, flags);
 507                 /* must check holding global lock to eliminate race */
 508                 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
 509                         cfs_list_add_tail(&rx->rx_list, &conn->ibc_early_rxs);
 510                         write_unlock_irqrestore(g_lock, flags);
 511                         return;
 512                 }
 513                 write_unlock_irqrestore(g_lock, flags);
 514         }
 515         kiblnd_handle_rx(rx);
 516         return;
 517
 518  failed:
 519         CDEBUG(D_NET, "rx %p conn %p\n", rx, conn);
 520         kiblnd_close_conn(conn, err);
 521  ignore:
 522         kiblnd_drop_rx(rx);                     /* Don't re-post rx. */
 523 }
 524
 525 struct page *
 526 kiblnd_kvaddr_to_page (unsigned long vaddr)
 527 {
 528         struct page *page;
 529
 530         if (vaddr >= VMALLOC_START &&
 531             vaddr < VMALLOC_END) {
 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  = tx->tx_pool->tpo_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         for (i = 0, npages = 0; i < rd->rd_nfrags; i++) {
 562                 for (size = 0; size <  rd->rd_frags[i].rf_nob;
 563                                size += hdev->ibh_page_size) {
 564                         pages[npages ++] = (rd->rd_frags[i].rf_addr &
 565                                             hdev->ibh_page_mask) + size;
 566                 }
 567         }
 568
 569         LASSERT(tx->tx_pool != NULL);
 570         LASSERT(tx->tx_pool->tpo_pool.po_owner != NULL);
 571
 572         cpt = tx->tx_pool->tpo_pool.po_owner->ps_cpt;
 573
 574         fps = net->ibn_fmr_ps[cpt];
 575         rc = kiblnd_fmr_pool_map(fps, pages, npages, 0, &tx->tx_u.fmr);
 576         if (rc != 0) {
 577                 CERROR ("Can't map %d pages: %d\n", npages, rc);
 578                 return rc;
 579         }
 580
 581         /* If rd is not tx_rd, it's going to get sent to a peer, who will need
 582          * the rkey */
 583         rd->rd_key = (rd != tx->tx_rd) ? tx->tx_u.fmr.fmr_pfmr->fmr->rkey :
 584                                          tx->tx_u.fmr.fmr_pfmr->fmr->lkey;
 585         rd->rd_frags[0].rf_addr &= ~hdev->ibh_page_mask;
 586         rd->rd_frags[0].rf_nob   = nob;
 587         rd->rd_nfrags = 1;
 588
 589         return 0;
 590 }
 591
 592 static int
 593 kiblnd_pmr_map_tx(kib_net_t *net, kib_tx_t *tx, kib_rdma_desc_t *rd, int nob)
 594 {
 595         kib_hca_dev_t           *hdev = tx->tx_pool->tpo_hdev;
 596         kib_pmr_poolset_t       *pps;
 597         __u64                   iova;
 598         int                     cpt;
 599         int                     rc;
 600
 601         iova = rd->rd_frags[0].rf_addr & ~hdev->ibh_page_mask;
 602
 603         LASSERT(tx->tx_pool != NULL);
 604         LASSERT(tx->tx_pool->tpo_pool.po_owner != NULL);
 605
 606         cpt = tx->tx_pool->tpo_pool.po_owner->ps_cpt;
 607
 608         pps = net->ibn_pmr_ps[cpt];
 609         rc = kiblnd_pmr_pool_map(pps, hdev, rd, &iova, &tx->tx_u.pmr);
 610         if (rc != 0) {
 611                 CERROR("Failed to create MR by phybuf: %d\n", rc);
 612                 return rc;
 613         }
 614
 615         /* If rd is not tx_rd, it's going to get sent to a peer, who will need
 616          * the rkey */
 617         rd->rd_key = (rd != tx->tx_rd) ? tx->tx_u.pmr->pmr_mr->rkey :
 618                                          tx->tx_u.pmr->pmr_mr->lkey;
 619         rd->rd_nfrags = 1;
 620         rd->rd_frags[0].rf_addr = iova;
 621         rd->rd_frags[0].rf_nob  = nob;
 622
 623         return 0;
 624 }
 625
 626 void
 627 kiblnd_unmap_tx(lnet_ni_t *ni, kib_tx_t *tx)
 628 {
 629         kib_net_t  *net = ni->ni_data;
 630
 631         LASSERT(net != NULL);
 632
 633         if (net->ibn_fmr_ps != NULL && tx->tx_u.fmr.fmr_pfmr != NULL) {
 634                 kiblnd_fmr_pool_unmap(&tx->tx_u.fmr, tx->tx_status);
 635                 tx->tx_u.fmr.fmr_pfmr = NULL;
 636
 637         } else if (net->ibn_pmr_ps != NULL && tx->tx_u.pmr != NULL) {
 638                 kiblnd_pmr_pool_unmap(tx->tx_u.pmr);
 639                 tx->tx_u.pmr = NULL;
 640         }
 641
 642         if (tx->tx_nfrags != 0) {
 643                 kiblnd_dma_unmap_sg(tx->tx_pool->tpo_hdev->ibh_ibdev,
 644                                     tx->tx_frags, tx->tx_nfrags, tx->tx_dmadir);
 645                 tx->tx_nfrags = 0;
 646         }
 647 }
 648
 649 int
 650 kiblnd_map_tx(lnet_ni_t *ni, kib_tx_t *tx,
 651               kib_rdma_desc_t *rd, int nfrags)
 652 {
 653         kib_hca_dev_t      *hdev  = tx->tx_pool->tpo_hdev;
 654         kib_net_t          *net   = ni->ni_data;
 655         struct ib_mr       *mr    = NULL;
 656         __u32               nob;
 657         int                 i;
 658
 659         /* If rd is not tx_rd, it's going to get sent to a peer and I'm the
 660          * RDMA sink */
 661         tx->tx_dmadir = (rd != tx->tx_rd) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
 662         tx->tx_nfrags = nfrags;
 663
 664         rd->rd_nfrags =
 665                 kiblnd_dma_map_sg(hdev->ibh_ibdev,
 666                                   tx->tx_frags, tx->tx_nfrags, tx->tx_dmadir);
 667
 668         for (i = 0, nob = 0; i < rd->rd_nfrags; i++) {
 669                 rd->rd_frags[i].rf_nob  = kiblnd_sg_dma_len(
 670                         hdev->ibh_ibdev, &tx->tx_frags[i]);
 671                 rd->rd_frags[i].rf_addr = kiblnd_sg_dma_address(
 672                         hdev->ibh_ibdev, &tx->tx_frags[i]);
 673                 nob += rd->rd_frags[i].rf_nob;
 674         }
 675
 676         /* looking for pre-mapping MR */
 677         mr = kiblnd_find_rd_dma_mr(hdev, rd);
 678         if (mr != NULL) {
 679                 /* found pre-mapping MR */
 680                 rd->rd_key = (rd != tx->tx_rd) ? mr->rkey : mr->lkey;
 681                 return 0;
 682         }
 683
 684         if (net->ibn_fmr_ps != NULL)
 685                 return kiblnd_fmr_map_tx(net, tx, rd, nob);
 686         else if (net->ibn_pmr_ps != NULL)
 687                 return kiblnd_pmr_map_tx(net, tx, rd, nob);
 688
 689         return -EINVAL;
 690 }
 691
 692
 693 int
 694 kiblnd_setup_rd_iov(lnet_ni_t *ni, kib_tx_t *tx, kib_rdma_desc_t *rd,
 695                     unsigned int niov, struct iovec *iov, int offset, int nob)
 696 {
 697         kib_net_t          *net = ni->ni_data;
 698         struct page        *page;
 699         struct scatterlist *sg;
 700         unsigned long       vaddr;
 701         int                 fragnob;
 702         int                 page_offset;
 703
 704         LASSERT (nob > 0);
 705         LASSERT (niov > 0);
 706         LASSERT (net != NULL);
 707
 708         while (offset >= iov->iov_len) {
 709                 offset -= iov->iov_len;
 710                 niov--;
 711                 iov++;
 712                 LASSERT (niov > 0);
 713         }
 714
 715         sg = tx->tx_frags;
 716         do {
 717                 LASSERT (niov > 0);
 718
 719                 vaddr = ((unsigned long)iov->iov_base) + offset;
 720                 page_offset = vaddr & (PAGE_SIZE - 1);
 721                 page = kiblnd_kvaddr_to_page(vaddr);
 722                 if (page == NULL) {
 723                         CERROR ("Can't find page\n");
 724                         return -EFAULT;
 725                 }
 726
 727                 fragnob = min((int)(iov->iov_len - offset), nob);
 728                 fragnob = min(fragnob, (int)PAGE_SIZE - page_offset);
 729
 730                 sg_set_page(sg, page, fragnob, page_offset);
 731                 sg++;
 732
 733                 if (offset + fragnob < iov->iov_len) {
 734                         offset += fragnob;
 735                 } else {
 736                         offset = 0;
 737                         iov++;
 738                         niov--;
 739                 }
 740                 nob -= fragnob;
 741         } while (nob > 0);
 742
 743         return kiblnd_map_tx(ni, tx, rd, sg - tx->tx_frags);
 744 }
 745
 746 int
 747 kiblnd_setup_rd_kiov (lnet_ni_t *ni, kib_tx_t *tx, kib_rdma_desc_t *rd,
 748                       int nkiov, lnet_kiov_t *kiov, int offset, int nob)
 749 {
 750         kib_net_t          *net = ni->ni_data;
 751         struct scatterlist *sg;
 752         int                 fragnob;
 753
 754         CDEBUG(D_NET, "niov %d offset %d nob %d\n", nkiov, offset, nob);
 755
 756         LASSERT (nob > 0);
 757         LASSERT (nkiov > 0);
 758         LASSERT (net != NULL);
 759
 760         while (offset >= kiov->kiov_len) {
 761                 offset -= kiov->kiov_len;
 762                 nkiov--;
 763                 kiov++;
 764                 LASSERT (nkiov > 0);
 765         }
 766
 767         sg = tx->tx_frags;
 768         do {
 769                 LASSERT (nkiov > 0);
 770
 771                 fragnob = min((int)(kiov->kiov_len - offset), nob);
 772
 773                 sg_set_page(sg, kiov->kiov_page, fragnob,
 774                             kiov->kiov_offset + offset);
 775                 sg++;
 776
 777                 offset = 0;
 778                 kiov++;
 779                 nkiov--;
 780                 nob -= fragnob;
 781         } while (nob > 0);
 782
 783         return kiblnd_map_tx(ni, tx, rd, sg - tx->tx_frags);
 784 }
 785
 786 int
 787 kiblnd_post_tx_locked (kib_conn_t *conn, kib_tx_t *tx, int credit)
 788 {
 789         kib_msg_t         *msg = tx->tx_msg;
 790         kib_peer_t        *peer = conn->ibc_peer;
 791         int                ver = conn->ibc_version;
 792         int                rc;
 793         int                done;
 794         struct ib_send_wr *bad_wrq;
 795
 796         LASSERT (tx->tx_queued);
 797         /* We rely on this for QP sizing */
 798         LASSERT (tx->tx_nwrq > 0);
 799         LASSERT (tx->tx_nwrq <= 1 + IBLND_RDMA_FRAGS(ver));
 800
 801         LASSERT (credit == 0 || credit == 1);
 802         LASSERT (conn->ibc_outstanding_credits >= 0);
 803         LASSERT (conn->ibc_outstanding_credits <= IBLND_MSG_QUEUE_SIZE(ver));
 804         LASSERT (conn->ibc_credits >= 0);
 805         LASSERT (conn->ibc_credits <= IBLND_MSG_QUEUE_SIZE(ver));
 806
 807         if (conn->ibc_nsends_posted == IBLND_CONCURRENT_SENDS(ver)) {
 808                 /* tx completions outstanding... */
 809                 CDEBUG(D_NET, "%s: posted enough\n",
 810                        libcfs_nid2str(peer->ibp_nid));
 811                 return -EAGAIN;
 812         }
 813
 814         if (credit != 0 && conn->ibc_credits == 0) {   /* no credits */
 815                 CDEBUG(D_NET, "%s: no credits\n",
 816                        libcfs_nid2str(peer->ibp_nid));
 817                 return -EAGAIN;
 818         }
 819
 820         if (credit != 0 && !IBLND_OOB_CAPABLE(ver) &&
 821             conn->ibc_credits == 1 &&   /* last credit reserved */
 822             msg->ibm_type != IBLND_MSG_NOOP) {      /* for NOOP */
 823                 CDEBUG(D_NET, "%s: not using last credit\n",
 824                        libcfs_nid2str(peer->ibp_nid));
 825                 return -EAGAIN;
 826         }
 827
 828         /* NB don't drop ibc_lock before bumping tx_sending */
 829         cfs_list_del(&tx->tx_list);
 830         tx->tx_queued = 0;
 831
 832         if (msg->ibm_type == IBLND_MSG_NOOP &&
 833             (!kiblnd_need_noop(conn) ||     /* redundant NOOP */
 834              (IBLND_OOB_CAPABLE(ver) && /* posted enough NOOP */
 835               conn->ibc_noops_posted == IBLND_OOB_MSGS(ver)))) {
 836                 /* OK to drop when posted enough NOOPs, since
 837                  * kiblnd_check_sends will queue NOOP again when
 838                  * posted NOOPs complete */
 839                 spin_unlock(&conn->ibc_lock);
 840                 kiblnd_tx_done(peer->ibp_ni, tx);
 841                 spin_lock(&conn->ibc_lock);
 842                 CDEBUG(D_NET, "%s(%d): redundant or enough NOOP\n",
 843                        libcfs_nid2str(peer->ibp_nid),
 844                        conn->ibc_noops_posted);
 845                 return 0;
 846         }
 847
 848         kiblnd_pack_msg(peer->ibp_ni, msg, ver, conn->ibc_outstanding_credits,
 849                         peer->ibp_nid, conn->ibc_incarnation);
 850
 851         conn->ibc_credits -= credit;
 852         conn->ibc_outstanding_credits = 0;
 853         conn->ibc_nsends_posted++;
 854         if (msg->ibm_type == IBLND_MSG_NOOP)
 855                 conn->ibc_noops_posted++;
 856
 857         /* CAVEAT EMPTOR!  This tx could be the PUT_DONE of an RDMA
 858          * PUT.  If so, it was first queued here as a PUT_REQ, sent and
 859          * stashed on ibc_active_txs, matched by an incoming PUT_ACK,
 860          * and then re-queued here.  It's (just) possible that
 861          * tx_sending is non-zero if we've not done the tx_complete()
 862          * from the first send; hence the ++ rather than = below. */
 863         tx->tx_sending++;
 864         cfs_list_add(&tx->tx_list, &conn->ibc_active_txs);
 865
 866         /* I'm still holding ibc_lock! */
 867         if (conn->ibc_state != IBLND_CONN_ESTABLISHED) {
 868                 rc = -ECONNABORTED;
 869         } else if (tx->tx_pool->tpo_pool.po_failed ||
 870                  conn->ibc_hdev != tx->tx_pool->tpo_hdev) {
 871                 /* close_conn will launch failover */
 872                 rc = -ENETDOWN;
 873         } else {
 874                 rc = ib_post_send(conn->ibc_cmid->qp,
 875                                   tx->tx_wrq, &bad_wrq);
 876         }
 877
 878         conn->ibc_last_send = jiffies;
 879
 880         if (rc == 0)
 881                 return 0;
 882
 883         /* NB credits are transferred in the actual
 884          * message, which can only be the last work item */
 885         conn->ibc_credits += credit;
 886         conn->ibc_outstanding_credits += msg->ibm_credits;
 887         conn->ibc_nsends_posted--;
 888         if (msg->ibm_type == IBLND_MSG_NOOP)
 889                 conn->ibc_noops_posted--;
 890
 891         tx->tx_status = rc;
 892         tx->tx_waiting = 0;
 893         tx->tx_sending--;
 894
 895         done = (tx->tx_sending == 0);
 896         if (done)
 897                 cfs_list_del(&tx->tx_list);
 898
 899         spin_unlock(&conn->ibc_lock);
 900
 901         if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
 902                 CERROR("Error %d posting transmit to %s\n",
 903                        rc, libcfs_nid2str(peer->ibp_nid));
 904         else
 905                 CDEBUG(D_NET, "Error %d posting transmit to %s\n",
 906                        rc, libcfs_nid2str(peer->ibp_nid));
 907
 908         kiblnd_close_conn(conn, rc);
 909
 910         if (done)
 911                 kiblnd_tx_done(peer->ibp_ni, tx);
 912
 913         spin_lock(&conn->ibc_lock);
 914
 915         return -EIO;
 916 }
 917
 918 void
 919 kiblnd_check_sends (kib_conn_t *conn)
 920 {
 921         int        ver = conn->ibc_version;
 922         lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
 923         kib_tx_t  *tx;
 924
 925         /* Don't send anything until after the connection is established */
 926         if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
 927                 CDEBUG(D_NET, "%s too soon\n",
 928                        libcfs_nid2str(conn->ibc_peer->ibp_nid));
 929                 return;
 930         }
 931
 932         spin_lock(&conn->ibc_lock);
 933
 934         LASSERT (conn->ibc_nsends_posted <= IBLND_CONCURRENT_SENDS(ver));
 935         LASSERT (!IBLND_OOB_CAPABLE(ver) ||
 936                  conn->ibc_noops_posted <= IBLND_OOB_MSGS(ver));
 937         LASSERT (conn->ibc_reserved_credits >= 0);
 938
 939         while (conn->ibc_reserved_credits > 0 &&
 940                !cfs_list_empty(&conn->ibc_tx_queue_rsrvd)) {
 941                 tx = cfs_list_entry(conn->ibc_tx_queue_rsrvd.next,
 942                                     kib_tx_t, tx_list);
 943                 cfs_list_del(&tx->tx_list);
 944                 cfs_list_add_tail(&tx->tx_list, &conn->ibc_tx_queue);
 945                 conn->ibc_reserved_credits--;
 946         }
 947
 948         if (kiblnd_need_noop(conn)) {
 949                 spin_unlock(&conn->ibc_lock);
 950
 951                 tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
 952                 if (tx != NULL)
 953                         kiblnd_init_tx_msg(ni, tx, IBLND_MSG_NOOP, 0);
 954
 955                 spin_lock(&conn->ibc_lock);
 956                 if (tx != NULL)
 957                         kiblnd_queue_tx_locked(tx, conn);
 958         }
 959
 960         kiblnd_conn_addref(conn); /* 1 ref for me.... (see b21911) */
 961
 962         for (;;) {
 963                 int credit;
 964
 965                 if (!cfs_list_empty(&conn->ibc_tx_queue_nocred)) {
 966                         credit = 0;
 967                         tx = cfs_list_entry(conn->ibc_tx_queue_nocred.next,
 968                                             kib_tx_t, tx_list);
 969                 } else if (!cfs_list_empty(&conn->ibc_tx_noops)) {
 970                         LASSERT (!IBLND_OOB_CAPABLE(ver));
 971                         credit = 1;
 972                         tx = cfs_list_entry(conn->ibc_tx_noops.next,
 973                                         kib_tx_t, tx_list);
 974                 } else if (!cfs_list_empty(&conn->ibc_tx_queue)) {
 975                         credit = 1;
 976                         tx = cfs_list_entry(conn->ibc_tx_queue.next,
 977                                             kib_tx_t, tx_list);
 978                 } else
 979                         break;
 980
 981                 if (kiblnd_post_tx_locked(conn, tx, credit) != 0)
 982                         break;
 983         }
 984
 985         spin_unlock(&conn->ibc_lock);
 986
 987         kiblnd_conn_decref(conn); /* ...until here */
 988 }
 989
 990 void
 991 kiblnd_tx_complete (kib_tx_t *tx, int status)
 992 {
 993         int           failed = (status != IB_WC_SUCCESS);
 994         kib_conn_t   *conn = tx->tx_conn;
 995         int           idle;
 996
 997         LASSERT (tx->tx_sending > 0);
 998
 999         if (failed) {
1000                 if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
1001                         CNETERR("Tx -> %s cookie "LPX64
1002                                 " sending %d waiting %d: failed %d\n",
1003                                 libcfs_nid2str(conn->ibc_peer->ibp_nid),
1004                                 tx->tx_cookie, tx->tx_sending, tx->tx_waiting,
1005                                 status);
1006
1007                 kiblnd_close_conn(conn, -EIO);
1008         } else {
1009                 kiblnd_peer_alive(conn->ibc_peer);
1010         }
1011
1012         spin_lock(&conn->ibc_lock);
1013
1014         /* I could be racing with rdma completion.  Whoever makes 'tx' idle
1015          * gets to free it, which also drops its ref on 'conn'. */
1016
1017         tx->tx_sending--;
1018         conn->ibc_nsends_posted--;
1019         if (tx->tx_msg->ibm_type == IBLND_MSG_NOOP)
1020                 conn->ibc_noops_posted--;
1021
1022         if (failed) {
1023                 tx->tx_waiting = 0;             /* don't wait for peer */
1024                 tx->tx_status = -EIO;
1025         }
1026
1027         idle = (tx->tx_sending == 0) &&         /* This is the final callback */
1028                !tx->tx_waiting &&               /* Not waiting for peer */
1029                !tx->tx_queued;                  /* Not re-queued (PUT_DONE) */
1030         if (idle)
1031                 cfs_list_del(&tx->tx_list);
1032
1033         kiblnd_conn_addref(conn);               /* 1 ref for me.... */
1034
1035         spin_unlock(&conn->ibc_lock);
1036
1037         if (idle)
1038                 kiblnd_tx_done(conn->ibc_peer->ibp_ni, tx);
1039
1040         kiblnd_check_sends(conn);
1041
1042         kiblnd_conn_decref(conn);               /* ...until here */
1043 }
1044
1045 void
1046 kiblnd_init_tx_msg (lnet_ni_t *ni, kib_tx_t *tx, int type, int body_nob)
1047 {
1048         kib_hca_dev_t     *hdev = tx->tx_pool->tpo_hdev;
1049         struct ib_sge     *sge = &tx->tx_sge[tx->tx_nwrq];
1050         struct ib_send_wr *wrq = &tx->tx_wrq[tx->tx_nwrq];
1051         int                nob = offsetof (kib_msg_t, ibm_u) + body_nob;
1052         struct ib_mr      *mr;
1053
1054         LASSERT (tx->tx_nwrq >= 0);
1055         LASSERT (tx->tx_nwrq < IBLND_MAX_RDMA_FRAGS + 1);
1056         LASSERT (nob <= IBLND_MSG_SIZE);
1057
1058         kiblnd_init_msg(tx->tx_msg, type, body_nob);
1059
1060         mr = kiblnd_find_dma_mr(hdev, tx->tx_msgaddr, nob);
1061         LASSERT (mr != NULL);
1062
1063         sge->lkey   = mr->lkey;
1064         sge->addr   = tx->tx_msgaddr;
1065         sge->length = nob;
1066
1067         memset(wrq, 0, sizeof(*wrq));
1068
1069         wrq->next       = NULL;
1070         wrq->wr_id      = kiblnd_ptr2wreqid(tx, IBLND_WID_TX);
1071         wrq->sg_list    = sge;
1072         wrq->num_sge    = 1;
1073         wrq->opcode     = IB_WR_SEND;
1074         wrq->send_flags = IB_SEND_SIGNALED;
1075
1076         tx->tx_nwrq++;
1077 }
1078
1079 int
1080 kiblnd_init_rdma (kib_conn_t *conn, kib_tx_t *tx, int type,
1081                   int resid, kib_rdma_desc_t *dstrd, __u64 dstcookie)
1082 {
1083         kib_msg_t         *ibmsg = tx->tx_msg;
1084         kib_rdma_desc_t   *srcrd = tx->tx_rd;
1085         struct ib_sge     *sge = &tx->tx_sge[0];
1086         struct ib_send_wr *wrq = &tx->tx_wrq[0];
1087         int                rc  = resid;
1088         int                srcidx;
1089         int                dstidx;
1090         int                wrknob;
1091
1092         LASSERT (!cfs_in_interrupt());
1093         LASSERT (tx->tx_nwrq == 0);
1094         LASSERT (type == IBLND_MSG_GET_DONE ||
1095                  type == IBLND_MSG_PUT_DONE);
1096
1097         srcidx = dstidx = 0;
1098
1099         while (resid > 0) {
1100                 if (srcidx >= srcrd->rd_nfrags) {
1101                         CERROR("Src buffer exhausted: %d frags\n", srcidx);
1102                         rc = -EPROTO;
1103                         break;
1104                 }
1105
1106                 if (dstidx == dstrd->rd_nfrags) {
1107                         CERROR("Dst buffer exhausted: %d frags\n", dstidx);
1108                         rc = -EPROTO;
1109                         break;
1110                 }
1111
1112                 if (tx->tx_nwrq == IBLND_RDMA_FRAGS(conn->ibc_version)) {
1113                         CERROR("RDMA too fragmented for %s (%d): "
1114                                "%d/%d src %d/%d dst frags\n",
1115                                libcfs_nid2str(conn->ibc_peer->ibp_nid),
1116                                IBLND_RDMA_FRAGS(conn->ibc_version),
1117                                srcidx, srcrd->rd_nfrags,
1118                                dstidx, dstrd->rd_nfrags);
1119                         rc = -EMSGSIZE;
1120                         break;
1121                 }
1122
1123                 wrknob = MIN(MIN(kiblnd_rd_frag_size(srcrd, srcidx),
1124                                  kiblnd_rd_frag_size(dstrd, dstidx)), resid);
1125
1126                 sge = &tx->tx_sge[tx->tx_nwrq];
1127                 sge->addr   = kiblnd_rd_frag_addr(srcrd, srcidx);
1128                 sge->lkey   = kiblnd_rd_frag_key(srcrd, srcidx);
1129                 sge->length = wrknob;
1130
1131                 wrq = &tx->tx_wrq[tx->tx_nwrq];
1132
1133                 wrq->next       = wrq + 1;
1134                 wrq->wr_id      = kiblnd_ptr2wreqid(tx, IBLND_WID_RDMA);
1135                 wrq->sg_list    = sge;
1136                 wrq->num_sge    = 1;
1137                 wrq->opcode     = IB_WR_RDMA_WRITE;
1138                 wrq->send_flags = 0;
1139
1140                 wrq->wr.rdma.remote_addr = kiblnd_rd_frag_addr(dstrd, dstidx);
1141                 wrq->wr.rdma.rkey        = kiblnd_rd_frag_key(dstrd, dstidx);
1142
1143                 srcidx = kiblnd_rd_consume_frag(srcrd, srcidx, wrknob);
1144                 dstidx = kiblnd_rd_consume_frag(dstrd, dstidx, wrknob);
1145
1146                 resid -= wrknob;
1147
1148                 tx->tx_nwrq++;
1149                 wrq++;
1150                 sge++;
1151         }
1152
1153         if (rc < 0)                             /* no RDMA if completing with failure */
1154                 tx->tx_nwrq = 0;
1155
1156         ibmsg->ibm_u.completion.ibcm_status = rc;
1157         ibmsg->ibm_u.completion.ibcm_cookie = dstcookie;
1158         kiblnd_init_tx_msg(conn->ibc_peer->ibp_ni, tx,
1159                            type, sizeof (kib_completion_msg_t));
1160
1161         return rc;
1162 }
1163
1164 void
1165 kiblnd_queue_tx_locked (kib_tx_t *tx, kib_conn_t *conn)
1166 {
1167         cfs_list_t   *q;
1168
1169         LASSERT (tx->tx_nwrq > 0);              /* work items set up */
1170         LASSERT (!tx->tx_queued);               /* not queued for sending already */
1171         LASSERT (conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1172
1173         tx->tx_queued = 1;
1174         tx->tx_deadline = jiffies + (*kiblnd_tunables.kib_timeout * CFS_HZ);
1175
1176         if (tx->tx_conn == NULL) {
1177                 kiblnd_conn_addref(conn);
1178                 tx->tx_conn = conn;
1179                 LASSERT (tx->tx_msg->ibm_type != IBLND_MSG_PUT_DONE);
1180         } else {
1181                 /* PUT_DONE first attached to conn as a PUT_REQ */
1182                 LASSERT (tx->tx_conn == conn);
1183                 LASSERT (tx->tx_msg->ibm_type == IBLND_MSG_PUT_DONE);
1184         }
1185
1186         switch (tx->tx_msg->ibm_type) {
1187         default:
1188                 LBUG();
1189
1190         case IBLND_MSG_PUT_REQ:
1191         case IBLND_MSG_GET_REQ:
1192                 q = &conn->ibc_tx_queue_rsrvd;
1193                 break;
1194
1195         case IBLND_MSG_PUT_NAK:
1196         case IBLND_MSG_PUT_ACK:
1197         case IBLND_MSG_PUT_DONE:
1198         case IBLND_MSG_GET_DONE:
1199                 q = &conn->ibc_tx_queue_nocred;
1200                 break;
1201
1202         case IBLND_MSG_NOOP:
1203                 if (IBLND_OOB_CAPABLE(conn->ibc_version))
1204                         q = &conn->ibc_tx_queue_nocred;
1205                 else
1206                         q = &conn->ibc_tx_noops;
1207                 break;
1208
1209         case IBLND_MSG_IMMEDIATE:
1210                 q = &conn->ibc_tx_queue;
1211                 break;
1212         }
1213
1214         cfs_list_add_tail(&tx->tx_list, q);
1215 }
1216
1217 void
1218 kiblnd_queue_tx (kib_tx_t *tx, kib_conn_t *conn)
1219 {
1220         spin_lock(&conn->ibc_lock);
1221         kiblnd_queue_tx_locked(tx, conn);
1222         spin_unlock(&conn->ibc_lock);
1223
1224         kiblnd_check_sends(conn);
1225 }
1226
1227 static int kiblnd_resolve_addr(struct rdma_cm_id *cmid,
1228                                struct sockaddr_in *srcaddr,
1229                                struct sockaddr_in *dstaddr,
1230                                int timeout_ms)
1231 {
1232         unsigned short port;
1233         int rc;
1234
1235 #ifdef HAVE_OFED_RDMA_SET_REUSEADDR
1236         /* allow the port to be reused */
1237         rc = rdma_set_reuseaddr(cmid, 1);
1238         if (rc != 0) {
1239                 CERROR("Unable to set reuse on cmid: %d\n", rc);
1240                 return rc;
1241         }
1242 #endif
1243
1244         /* look for a free privileged port */
1245         for (port = PROT_SOCK-1; port > 0; port--) {
1246                 srcaddr->sin_port = htons(port);
1247                 rc = rdma_resolve_addr(cmid,
1248                                        (struct sockaddr *)srcaddr,
1249                                        (struct sockaddr *)dstaddr,
1250                                        timeout_ms);
1251                 if (rc == 0) {
1252                         CDEBUG(D_NET, "bound to port %hu\n", port);
1253                         return 0;
1254                 } else if (rc == -EADDRINUSE || rc == -EADDRNOTAVAIL) {
1255                         CDEBUG(D_NET, "bind to port %hu failed: %d\n",
1256                                port, rc);
1257                 } else {
1258                         return rc;
1259                 }
1260         }
1261
1262         CERROR("Failed to bind to a free privileged port\n");
1263 #ifndef HAVE_OFED_RDMA_SET_REUSEADDR
1264         CERROR("You may need IB verbs that supports rdma_set_reuseaddr()\n");
1265 #endif
1266         return rc;
1267 }
1268
1269 void
1270 kiblnd_connect_peer (kib_peer_t *peer)
1271 {
1272         struct rdma_cm_id *cmid;
1273         kib_dev_t         *dev;
1274         kib_net_t         *net = peer->ibp_ni->ni_data;
1275         struct sockaddr_in srcaddr;
1276         struct sockaddr_in dstaddr;
1277         int                rc;
1278
1279         LASSERT (net != NULL);
1280         LASSERT (peer->ibp_connecting > 0);
1281
1282         cmid = kiblnd_rdma_create_id(kiblnd_cm_callback, peer, RDMA_PS_TCP,
1283                                      IB_QPT_RC);
1284
1285         if (IS_ERR(cmid)) {
1286                 CERROR("Can't create CMID for %s: %ld\n",
1287                        libcfs_nid2str(peer->ibp_nid), PTR_ERR(cmid));
1288                 rc = PTR_ERR(cmid);
1289                 goto failed;
1290         }
1291
1292         dev = net->ibn_dev;
1293         memset(&srcaddr, 0, sizeof(srcaddr));
1294         srcaddr.sin_family = AF_INET;
1295         srcaddr.sin_addr.s_addr = htonl(dev->ibd_ifip);
1296
1297         memset(&dstaddr, 0, sizeof(dstaddr));
1298         dstaddr.sin_family = AF_INET;
1299         dstaddr.sin_port = htons(*kiblnd_tunables.kib_service);
1300         dstaddr.sin_addr.s_addr = htonl(LNET_NIDADDR(peer->ibp_nid));
1301
1302         kiblnd_peer_addref(peer);               /* cmid's ref */
1303
1304         if (*kiblnd_tunables.kib_use_priv_port) {
1305                 rc = kiblnd_resolve_addr(cmid, &srcaddr, &dstaddr,
1306                                          *kiblnd_tunables.kib_timeout * 1000);
1307         } else {
1308                 rc = rdma_resolve_addr(cmid,
1309                                        (struct sockaddr *)&srcaddr,
1310                                        (struct sockaddr *)&dstaddr,
1311                                        *kiblnd_tunables.kib_timeout * 1000);
1312         }
1313         if (rc != 0) {
1314                 /* Can't initiate address resolution:  */
1315                 CERROR("Can't resolve addr for %s: %d\n",
1316                        libcfs_nid2str(peer->ibp_nid), rc);
1317                 goto failed2;
1318         }
1319
1320         LASSERT (cmid->device != NULL);
1321         CDEBUG(D_NET, "%s: connection bound to %s:%u.%u.%u.%u:%s\n",
1322                libcfs_nid2str(peer->ibp_nid), dev->ibd_ifname,
1323                HIPQUAD(dev->ibd_ifip), cmid->device->name);
1324
1325         return;
1326
1327  failed2:
1328         kiblnd_peer_decref(peer);               /* cmid's ref */
1329         rdma_destroy_id(cmid);
1330  failed:
1331         kiblnd_peer_connect_failed(peer, 1, rc);
1332 }
1333
1334 void
1335 kiblnd_launch_tx (lnet_ni_t *ni, kib_tx_t *tx, lnet_nid_t nid)
1336 {
1337         kib_peer_t        *peer;
1338         kib_peer_t        *peer2;
1339         kib_conn_t        *conn;
1340         rwlock_t        *g_lock = &kiblnd_data.kib_global_lock;
1341         unsigned long      flags;
1342         int                rc;
1343
1344         /* If I get here, I've committed to send, so I complete the tx with
1345          * failure on any problems */
1346
1347         LASSERT (tx == NULL || tx->tx_conn == NULL); /* only set when assigned a conn */
1348         LASSERT (tx == NULL || tx->tx_nwrq > 0);     /* work items have been set up */
1349
1350         /* First time, just use a read lock since I expect to find my peer
1351          * connected */
1352         read_lock_irqsave(g_lock, flags);
1353
1354         peer = kiblnd_find_peer_locked(nid);
1355         if (peer != NULL && !cfs_list_empty(&peer->ibp_conns)) {
1356                 /* Found a peer with an established connection */
1357                 conn = kiblnd_get_conn_locked(peer);
1358                 kiblnd_conn_addref(conn); /* 1 ref for me... */
1359
1360                 read_unlock_irqrestore(g_lock, flags);
1361
1362                 if (tx != NULL)
1363                         kiblnd_queue_tx(tx, conn);
1364                 kiblnd_conn_decref(conn); /* ...to here */
1365                 return;
1366         }
1367
1368         read_unlock(g_lock);
1369         /* Re-try with a write lock */
1370         write_lock(g_lock);
1371
1372         peer = kiblnd_find_peer_locked(nid);
1373         if (peer != NULL) {
1374                 if (cfs_list_empty(&peer->ibp_conns)) {
1375                         /* found a peer, but it's still connecting... */
1376                         LASSERT (peer->ibp_connecting != 0 ||
1377                                  peer->ibp_accepting != 0);
1378                         if (tx != NULL)
1379                                 cfs_list_add_tail(&tx->tx_list,
1380                                                   &peer->ibp_tx_queue);
1381                         write_unlock_irqrestore(g_lock, flags);
1382                 } else {
1383                         conn = kiblnd_get_conn_locked(peer);
1384                         kiblnd_conn_addref(conn); /* 1 ref for me... */
1385
1386                         write_unlock_irqrestore(g_lock, flags);
1387
1388                         if (tx != NULL)
1389                                 kiblnd_queue_tx(tx, conn);
1390                         kiblnd_conn_decref(conn); /* ...to here */
1391                 }
1392                 return;
1393         }
1394
1395         write_unlock_irqrestore(g_lock, flags);
1396
1397         /* Allocate a peer ready to add to the peer table and retry */
1398         rc = kiblnd_create_peer(ni, &peer, nid);
1399         if (rc != 0) {
1400                 CERROR("Can't create peer %s\n", libcfs_nid2str(nid));
1401                 if (tx != NULL) {
1402                         tx->tx_status = -EHOSTUNREACH;
1403                         tx->tx_waiting = 0;
1404                         kiblnd_tx_done(ni, tx);
1405                 }
1406                 return;
1407         }
1408
1409         write_lock_irqsave(g_lock, flags);
1410
1411         peer2 = kiblnd_find_peer_locked(nid);
1412         if (peer2 != NULL) {
1413                 if (cfs_list_empty(&peer2->ibp_conns)) {
1414                         /* found a peer, but it's still connecting... */
1415                         LASSERT (peer2->ibp_connecting != 0 ||
1416                                  peer2->ibp_accepting != 0);
1417                         if (tx != NULL)
1418                                 cfs_list_add_tail(&tx->tx_list,
1419                                                   &peer2->ibp_tx_queue);
1420                         write_unlock_irqrestore(g_lock, flags);
1421                 } else {
1422                         conn = kiblnd_get_conn_locked(peer2);
1423                         kiblnd_conn_addref(conn); /* 1 ref for me... */
1424
1425                         write_unlock_irqrestore(g_lock, flags);
1426
1427                         if (tx != NULL)
1428                                 kiblnd_queue_tx(tx, conn);
1429                         kiblnd_conn_decref(conn); /* ...to here */
1430                 }
1431
1432                 kiblnd_peer_decref(peer);
1433                 return;
1434         }
1435
1436         /* Brand new peer */
1437         LASSERT (peer->ibp_connecting == 0);
1438         peer->ibp_connecting = 1;
1439
1440         /* always called with a ref on ni, which prevents ni being shutdown */
1441         LASSERT (((kib_net_t *)ni->ni_data)->ibn_shutdown == 0);
1442
1443         if (tx != NULL)
1444                 cfs_list_add_tail(&tx->tx_list, &peer->ibp_tx_queue);
1445
1446         kiblnd_peer_addref(peer);
1447         cfs_list_add_tail(&peer->ibp_list, kiblnd_nid2peerlist(nid));
1448
1449         write_unlock_irqrestore(g_lock, flags);
1450
1451         kiblnd_connect_peer(peer);
1452         kiblnd_peer_decref(peer);
1453 }
1454
1455 int
1456 kiblnd_send (lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg)
1457 {
1458         lnet_hdr_t       *hdr = &lntmsg->msg_hdr;
1459         int               type = lntmsg->msg_type;
1460         lnet_process_id_t target = lntmsg->msg_target;
1461         int               target_is_router = lntmsg->msg_target_is_router;
1462         int               routing = lntmsg->msg_routing;
1463         unsigned int      payload_niov = lntmsg->msg_niov;
1464         struct iovec     *payload_iov = lntmsg->msg_iov;
1465         lnet_kiov_t      *payload_kiov = lntmsg->msg_kiov;
1466         unsigned int      payload_offset = lntmsg->msg_offset;
1467         unsigned int      payload_nob = lntmsg->msg_len;
1468         kib_msg_t        *ibmsg;
1469         kib_tx_t         *tx;
1470         int               nob;
1471         int               rc;
1472
1473         /* NB 'private' is different depending on what we're sending.... */
1474
1475         CDEBUG(D_NET, "sending %d bytes in %d frags to %s\n",
1476                payload_nob, payload_niov, libcfs_id2str(target));
1477
1478         LASSERT (payload_nob == 0 || payload_niov > 0);
1479         LASSERT (payload_niov <= LNET_MAX_IOV);
1480
1481         /* Thread context */
1482         LASSERT (!cfs_in_interrupt());
1483         /* payload is either all vaddrs or all pages */
1484         LASSERT (!(payload_kiov != NULL && payload_iov != NULL));
1485
1486         switch (type) {
1487         default:
1488                 LBUG();
1489                 return (-EIO);
1490
1491         case LNET_MSG_ACK:
1492                 LASSERT (payload_nob == 0);
1493                 break;
1494
1495         case LNET_MSG_GET:
1496                 if (routing || target_is_router)
1497                         break;                  /* send IMMEDIATE */
1498
1499                 /* is the REPLY message too small for RDMA? */
1500                 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[lntmsg->msg_md->md_length]);
1501                 if (nob <= IBLND_MSG_SIZE)
1502                         break;                  /* send IMMEDIATE */
1503
1504                 tx = kiblnd_get_idle_tx(ni, target.nid);
1505                 if (tx == NULL) {
1506                         CERROR("Can't allocate txd for GET to %s\n",
1507                                libcfs_nid2str(target.nid));
1508                         return -ENOMEM;
1509                 }
1510
1511                 ibmsg = tx->tx_msg;
1512
1513                 if ((lntmsg->msg_md->md_options & LNET_MD_KIOV) == 0)
1514                         rc = kiblnd_setup_rd_iov(ni, tx,
1515                                                  &ibmsg->ibm_u.get.ibgm_rd,
1516                                                  lntmsg->msg_md->md_niov,
1517                                                  lntmsg->msg_md->md_iov.iov,
1518                                                  0, lntmsg->msg_md->md_length);
1519                 else
1520                         rc = kiblnd_setup_rd_kiov(ni, tx,
1521                                                   &ibmsg->ibm_u.get.ibgm_rd,
1522                                                   lntmsg->msg_md->md_niov,
1523                                                   lntmsg->msg_md->md_iov.kiov,
1524                                                   0, lntmsg->msg_md->md_length);
1525                 if (rc != 0) {
1526                         CERROR("Can't setup GET sink for %s: %d\n",
1527                                libcfs_nid2str(target.nid), rc);
1528                         kiblnd_tx_done(ni, tx);
1529                         return -EIO;
1530                 }
1531
1532                 nob = offsetof(kib_get_msg_t, ibgm_rd.rd_frags[tx->tx_nfrags]);
1533                 ibmsg->ibm_u.get.ibgm_cookie = tx->tx_cookie;
1534                 ibmsg->ibm_u.get.ibgm_hdr = *hdr;
1535
1536                 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_GET_REQ, nob);
1537
1538                 tx->tx_lntmsg[1] = lnet_create_reply_msg(ni, lntmsg);
1539                 if (tx->tx_lntmsg[1] == NULL) {
1540                         CERROR("Can't create reply for GET -> %s\n",
1541                                libcfs_nid2str(target.nid));
1542                         kiblnd_tx_done(ni, tx);
1543                         return -EIO;
1544                 }
1545
1546                 tx->tx_lntmsg[0] = lntmsg;      /* finalise lntmsg[0,1] on completion */
1547                 tx->tx_waiting = 1;             /* waiting for GET_DONE */
1548                 kiblnd_launch_tx(ni, tx, target.nid);
1549                 return 0;
1550
1551         case LNET_MSG_REPLY:
1552         case LNET_MSG_PUT:
1553                 /* Is the payload small enough not to need RDMA? */
1554                 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[payload_nob]);
1555                 if (nob <= IBLND_MSG_SIZE)
1556                         break;                  /* send IMMEDIATE */
1557
1558                 tx = kiblnd_get_idle_tx(ni, target.nid);
1559                 if (tx == NULL) {
1560                         CERROR("Can't allocate %s txd for %s\n",
1561                                type == LNET_MSG_PUT ? "PUT" : "REPLY",
1562                                libcfs_nid2str(target.nid));
1563                         return -ENOMEM;
1564                 }
1565
1566                 if (payload_kiov == NULL)
1567                         rc = kiblnd_setup_rd_iov(ni, tx, tx->tx_rd,
1568                                                  payload_niov, payload_iov,
1569                                                  payload_offset, payload_nob);
1570                 else
1571                         rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
1572                                                   payload_niov, payload_kiov,
1573                                                   payload_offset, payload_nob);
1574                 if (rc != 0) {
1575                         CERROR("Can't setup PUT src for %s: %d\n",
1576                                libcfs_nid2str(target.nid), rc);
1577                         kiblnd_tx_done(ni, tx);
1578                         return -EIO;
1579                 }
1580
1581                 ibmsg = tx->tx_msg;
1582                 ibmsg->ibm_u.putreq.ibprm_hdr = *hdr;
1583                 ibmsg->ibm_u.putreq.ibprm_cookie = tx->tx_cookie;
1584                 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_REQ, sizeof(kib_putreq_msg_t));
1585
1586                 tx->tx_lntmsg[0] = lntmsg;      /* finalise lntmsg on completion */
1587                 tx->tx_waiting = 1;             /* waiting for PUT_{ACK,NAK} */
1588                 kiblnd_launch_tx(ni, tx, target.nid);
1589                 return 0;
1590         }
1591
1592         /* send IMMEDIATE */
1593
1594         LASSERT (offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[payload_nob])
1595                  <= IBLND_MSG_SIZE);
1596
1597         tx = kiblnd_get_idle_tx(ni, target.nid);
1598         if (tx == NULL) {
1599                 CERROR ("Can't send %d to %s: tx descs exhausted\n",
1600                         type, libcfs_nid2str(target.nid));
1601                 return -ENOMEM;
1602         }
1603
1604         ibmsg = tx->tx_msg;
1605         ibmsg->ibm_u.immediate.ibim_hdr = *hdr;
1606
1607         if (payload_kiov != NULL)
1608                 lnet_copy_kiov2flat(IBLND_MSG_SIZE, ibmsg,
1609                                     offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1610                                     payload_niov, payload_kiov,
1611                                     payload_offset, payload_nob);
1612         else
1613                 lnet_copy_iov2flat(IBLND_MSG_SIZE, ibmsg,
1614                                    offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1615                                    payload_niov, payload_iov,
1616                                    payload_offset, payload_nob);
1617
1618         nob = offsetof(kib_immediate_msg_t, ibim_payload[payload_nob]);
1619         kiblnd_init_tx_msg(ni, tx, IBLND_MSG_IMMEDIATE, nob);
1620
1621         tx->tx_lntmsg[0] = lntmsg;              /* finalise lntmsg on completion */
1622         kiblnd_launch_tx(ni, tx, target.nid);
1623         return 0;
1624 }
1625
1626 void
1627 kiblnd_reply (lnet_ni_t *ni, kib_rx_t *rx, lnet_msg_t *lntmsg)
1628 {
1629         lnet_process_id_t target = lntmsg->msg_target;
1630         unsigned int      niov = lntmsg->msg_niov;
1631         struct iovec     *iov = lntmsg->msg_iov;
1632         lnet_kiov_t      *kiov = lntmsg->msg_kiov;
1633         unsigned int      offset = lntmsg->msg_offset;
1634         unsigned int      nob = lntmsg->msg_len;
1635         kib_tx_t         *tx;
1636         int               rc;
1637
1638         tx = kiblnd_get_idle_tx(ni, rx->rx_conn->ibc_peer->ibp_nid);
1639         if (tx == NULL) {
1640                 CERROR("Can't get tx for REPLY to %s\n",
1641                        libcfs_nid2str(target.nid));
1642                 goto failed_0;
1643         }
1644
1645         if (nob == 0)
1646                 rc = 0;
1647         else if (kiov == NULL)
1648                 rc = kiblnd_setup_rd_iov(ni, tx, tx->tx_rd,
1649                                          niov, iov, offset, nob);
1650         else
1651                 rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
1652                                           niov, kiov, offset, nob);
1653
1654         if (rc != 0) {
1655                 CERROR("Can't setup GET src for %s: %d\n",
1656                        libcfs_nid2str(target.nid), rc);
1657                 goto failed_1;
1658         }
1659
1660         rc = kiblnd_init_rdma(rx->rx_conn, tx,
1661                               IBLND_MSG_GET_DONE, nob,
1662                               &rx->rx_msg->ibm_u.get.ibgm_rd,
1663                               rx->rx_msg->ibm_u.get.ibgm_cookie);
1664         if (rc < 0) {
1665                 CERROR("Can't setup rdma for GET from %s: %d\n",
1666                        libcfs_nid2str(target.nid), rc);
1667                 goto failed_1;
1668         }
1669
1670         if (nob == 0) {
1671                 /* No RDMA: local completion may happen now! */
1672                 lnet_finalize(ni, lntmsg, 0);
1673         } else {
1674                 /* RDMA: lnet_finalize(lntmsg) when it
1675                  * completes */
1676                 tx->tx_lntmsg[0] = lntmsg;
1677         }
1678
1679         kiblnd_queue_tx(tx, rx->rx_conn);
1680         return;
1681
1682  failed_1:
1683         kiblnd_tx_done(ni, tx);
1684  failed_0:
1685         lnet_finalize(ni, lntmsg, -EIO);
1686 }
1687
1688 int
1689 kiblnd_recv (lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg, int delayed,
1690              unsigned int niov, struct iovec *iov, lnet_kiov_t *kiov,
1691              unsigned int offset, unsigned int mlen, unsigned int rlen)
1692 {
1693         kib_rx_t    *rx = private;
1694         kib_msg_t   *rxmsg = rx->rx_msg;
1695         kib_conn_t  *conn = rx->rx_conn;
1696         kib_tx_t    *tx;
1697         kib_msg_t   *txmsg;
1698         int          nob;
1699         int          post_credit = IBLND_POSTRX_PEER_CREDIT;
1700         int          rc = 0;
1701
1702         LASSERT (mlen <= rlen);
1703         LASSERT (!cfs_in_interrupt());
1704         /* Either all pages or all vaddrs */
1705         LASSERT (!(kiov != NULL && iov != NULL));
1706
1707         switch (rxmsg->ibm_type) {
1708         default:
1709                 LBUG();
1710
1711         case IBLND_MSG_IMMEDIATE:
1712                 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[rlen]);
1713                 if (nob > rx->rx_nob) {
1714                         CERROR ("Immediate message from %s too big: %d(%d)\n",
1715                                 libcfs_nid2str(rxmsg->ibm_u.immediate.ibim_hdr.src_nid),
1716                                 nob, rx->rx_nob);
1717                         rc = -EPROTO;
1718                         break;
1719                 }
1720
1721                 if (kiov != NULL)
1722                         lnet_copy_flat2kiov(niov, kiov, offset,
1723                                             IBLND_MSG_SIZE, rxmsg,
1724                                             offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1725                                             mlen);
1726                 else
1727                         lnet_copy_flat2iov(niov, iov, offset,
1728                                            IBLND_MSG_SIZE, rxmsg,
1729                                            offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1730                                            mlen);
1731                 lnet_finalize (ni, lntmsg, 0);
1732                 break;
1733
1734         case IBLND_MSG_PUT_REQ:
1735                 if (mlen == 0) {
1736                         lnet_finalize(ni, lntmsg, 0);
1737                         kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK, 0,
1738                                                rxmsg->ibm_u.putreq.ibprm_cookie);
1739                         break;
1740                 }
1741
1742                 tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
1743                 if (tx == NULL) {
1744                         CERROR("Can't allocate tx for %s\n",
1745                                libcfs_nid2str(conn->ibc_peer->ibp_nid));
1746                         /* Not replying will break the connection */
1747                         rc = -ENOMEM;
1748                         break;
1749                 }
1750
1751                 txmsg = tx->tx_msg;
1752                 if (kiov == NULL)
1753                         rc = kiblnd_setup_rd_iov(ni, tx,
1754                                                  &txmsg->ibm_u.putack.ibpam_rd,
1755                                                  niov, iov, offset, mlen);
1756                 else
1757                         rc = kiblnd_setup_rd_kiov(ni, tx,
1758                                                   &txmsg->ibm_u.putack.ibpam_rd,
1759                                                   niov, kiov, offset, mlen);
1760                 if (rc != 0) {
1761                         CERROR("Can't setup PUT sink for %s: %d\n",
1762                                libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
1763                         kiblnd_tx_done(ni, tx);
1764                         /* tell peer it's over */
1765                         kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK, rc,
1766                                                rxmsg->ibm_u.putreq.ibprm_cookie);
1767                         break;
1768                 }
1769
1770                 nob = offsetof(kib_putack_msg_t, ibpam_rd.rd_frags[tx->tx_nfrags]);
1771                 txmsg->ibm_u.putack.ibpam_src_cookie = rxmsg->ibm_u.putreq.ibprm_cookie;
1772                 txmsg->ibm_u.putack.ibpam_dst_cookie = tx->tx_cookie;
1773
1774                 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_ACK, nob);
1775
1776                 tx->tx_lntmsg[0] = lntmsg;      /* finalise lntmsg on completion */
1777                 tx->tx_waiting = 1;             /* waiting for PUT_DONE */
1778                 kiblnd_queue_tx(tx, conn);
1779
1780                 /* reposted buffer reserved for PUT_DONE */
1781                 post_credit = IBLND_POSTRX_NO_CREDIT;
1782                 break;
1783
1784         case IBLND_MSG_GET_REQ:
1785                 if (lntmsg != NULL) {
1786                         /* Optimized GET; RDMA lntmsg's payload */
1787                         kiblnd_reply(ni, rx, lntmsg);
1788                 } else {
1789                         /* GET didn't match anything */
1790                         kiblnd_send_completion(rx->rx_conn, IBLND_MSG_GET_DONE,
1791                                                -ENODATA,
1792                                                rxmsg->ibm_u.get.ibgm_cookie);
1793                 }
1794                 break;
1795         }
1796
1797         kiblnd_post_rx(rx, post_credit);
1798         return rc;
1799 }
1800
1801 int
1802 kiblnd_thread_start (int (*fn)(void *arg), void *arg)
1803 {
1804         long    pid = cfs_create_thread (fn, arg, 0);
1805
1806         if (pid < 0)
1807                 return ((int)pid);
1808
1809         cfs_atomic_inc (&kiblnd_data.kib_nthreads);
1810         return (0);
1811 }
1812
1813 void
1814 kiblnd_thread_fini (void)
1815 {
1816         cfs_atomic_dec (&kiblnd_data.kib_nthreads);
1817 }
1818
1819 void
1820 kiblnd_peer_alive (kib_peer_t *peer)
1821 {
1822         /* This is racy, but everyone's only writing cfs_time_current() */
1823         peer->ibp_last_alive = cfs_time_current();
1824         cfs_mb();
1825 }
1826
1827 void
1828 kiblnd_peer_notify (kib_peer_t *peer)
1829 {
1830         int           error = 0;
1831         cfs_time_t    last_alive = 0;
1832         unsigned long flags;
1833
1834         read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1835
1836         if (cfs_list_empty(&peer->ibp_conns) &&
1837             peer->ibp_accepting == 0 &&
1838             peer->ibp_connecting == 0 &&
1839             peer->ibp_error != 0) {
1840                 error = peer->ibp_error;
1841                 peer->ibp_error = 0;
1842
1843                 last_alive = peer->ibp_last_alive;
1844         }
1845
1846         read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1847
1848         if (error != 0)
1849                 lnet_notify(peer->ibp_ni,
1850                             peer->ibp_nid, 0, last_alive);
1851 }
1852
1853 void
1854 kiblnd_close_conn_locked (kib_conn_t *conn, int error)
1855 {
1856         /* This just does the immediate housekeeping.  'error' is zero for a
1857          * normal shutdown which can happen only after the connection has been
1858          * established.  If the connection is established, schedule the
1859          * connection to be finished off by the connd.  Otherwise the connd is
1860          * already dealing with it (either to set it up or tear it down).
1861          * Caller holds kib_global_lock exclusively in irq context */
1862         kib_peer_t       *peer = conn->ibc_peer;
1863         kib_dev_t        *dev;
1864         unsigned long     flags;
1865
1866         LASSERT (error != 0 || conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1867
1868         if (error != 0 && conn->ibc_comms_error == 0)
1869                 conn->ibc_comms_error = error;
1870
1871         if (conn->ibc_state != IBLND_CONN_ESTABLISHED)
1872                 return; /* already being handled  */
1873
1874         if (error == 0 &&
1875             cfs_list_empty(&conn->ibc_tx_noops) &&
1876             cfs_list_empty(&conn->ibc_tx_queue) &&
1877             cfs_list_empty(&conn->ibc_tx_queue_rsrvd) &&
1878             cfs_list_empty(&conn->ibc_tx_queue_nocred) &&
1879             cfs_list_empty(&conn->ibc_active_txs)) {
1880                 CDEBUG(D_NET, "closing conn to %s\n",
1881                        libcfs_nid2str(peer->ibp_nid));
1882         } else {
1883                 CNETERR("Closing conn to %s: error %d%s%s%s%s%s\n",
1884                        libcfs_nid2str(peer->ibp_nid), error,
1885                        cfs_list_empty(&conn->ibc_tx_queue) ? "" : "(sending)",
1886                        cfs_list_empty(&conn->ibc_tx_noops) ? "" : "(sending_noops)",
1887                        cfs_list_empty(&conn->ibc_tx_queue_rsrvd) ? "" : "(sending_rsrvd)",
1888                        cfs_list_empty(&conn->ibc_tx_queue_nocred) ? "" : "(sending_nocred)",
1889                        cfs_list_empty(&conn->ibc_active_txs) ? "" : "(waiting)");
1890         }
1891
1892         dev = ((kib_net_t *)peer->ibp_ni->ni_data)->ibn_dev;
1893         cfs_list_del(&conn->ibc_list);
1894         /* connd (see below) takes over ibc_list's ref */
1895
1896         if (cfs_list_empty (&peer->ibp_conns) &&    /* no more conns */
1897             kiblnd_peer_active(peer)) {         /* still in peer table */
1898                 kiblnd_unlink_peer_locked(peer);
1899
1900                 /* set/clear error on last conn */
1901                 peer->ibp_error = conn->ibc_comms_error;
1902         }
1903
1904         kiblnd_set_conn_state(conn, IBLND_CONN_CLOSING);
1905
1906         if (error != 0 &&
1907             kiblnd_dev_can_failover(dev)) {
1908                 cfs_list_add_tail(&dev->ibd_fail_list,
1909                               &kiblnd_data.kib_failed_devs);
1910                 cfs_waitq_signal(&kiblnd_data.kib_failover_waitq);
1911         }
1912
1913         spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
1914
1915         cfs_list_add_tail(&conn->ibc_list, &kiblnd_data.kib_connd_conns);
1916         cfs_waitq_signal(&kiblnd_data.kib_connd_waitq);
1917
1918         spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock, flags);
1919 }
1920
1921 void
1922 kiblnd_close_conn(kib_conn_t *conn, int error)
1923 {
1924         unsigned long flags;
1925
1926         write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1927
1928         kiblnd_close_conn_locked(conn, error);
1929
1930         write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1931 }
1932
1933 void
1934 kiblnd_handle_early_rxs(kib_conn_t *conn)
1935 {
1936         unsigned long    flags;
1937         kib_rx_t        *rx;
1938
1939         LASSERT(!cfs_in_interrupt());
1940         LASSERT(conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1941
1942         write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1943         while (!cfs_list_empty(&conn->ibc_early_rxs)) {
1944                 rx = cfs_list_entry(conn->ibc_early_rxs.next,
1945                                     kib_rx_t, rx_list);
1946                 cfs_list_del(&rx->rx_list);
1947                 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1948
1949                 kiblnd_handle_rx(rx);
1950
1951                 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1952         }
1953         write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1954 }
1955
1956 void
1957 kiblnd_abort_txs(kib_conn_t *conn, cfs_list_t *txs)
1958 {
1959         CFS_LIST_HEAD       (zombies);
1960         cfs_list_t          *tmp;
1961         cfs_list_t          *nxt;
1962         kib_tx_t            *tx;
1963
1964         spin_lock(&conn->ibc_lock);
1965
1966         cfs_list_for_each_safe (tmp, nxt, txs) {
1967                 tx = cfs_list_entry (tmp, kib_tx_t, tx_list);
1968
1969                 if (txs == &conn->ibc_active_txs) {
1970                         LASSERT (!tx->tx_queued);
1971                         LASSERT (tx->tx_waiting ||
1972                                  tx->tx_sending != 0);
1973                 } else {
1974                         LASSERT (tx->tx_queued);
1975                 }
1976
1977                 tx->tx_status = -ECONNABORTED;
1978                 tx->tx_waiting = 0;
1979
1980                 if (tx->tx_sending == 0) {
1981                         tx->tx_queued = 0;
1982                         cfs_list_del (&tx->tx_list);
1983                         cfs_list_add (&tx->tx_list, &zombies);
1984                 }
1985         }
1986
1987         spin_unlock(&conn->ibc_lock);
1988
1989         kiblnd_txlist_done(conn->ibc_peer->ibp_ni, &zombies, -ECONNABORTED);
1990 }
1991
1992 void
1993 kiblnd_finalise_conn (kib_conn_t *conn)
1994 {
1995         LASSERT (!cfs_in_interrupt());
1996         LASSERT (conn->ibc_state > IBLND_CONN_INIT);
1997
1998         kiblnd_set_conn_state(conn, IBLND_CONN_DISCONNECTED);
1999
2000         /* abort_receives moves QP state to IB_QPS_ERR.  This is only required
2001          * for connections that didn't get as far as being connected, because
2002          * rdma_disconnect() does this for free. */
2003         kiblnd_abort_receives(conn);
2004
2005         /* Complete all tx descs not waiting for sends to complete.
2006          * NB we should be safe from RDMA now that the QP has changed state */
2007
2008         kiblnd_abort_txs(conn, &conn->ibc_tx_noops);
2009         kiblnd_abort_txs(conn, &conn->ibc_tx_queue);
2010         kiblnd_abort_txs(conn, &conn->ibc_tx_queue_rsrvd);
2011         kiblnd_abort_txs(conn, &conn->ibc_tx_queue_nocred);
2012         kiblnd_abort_txs(conn, &conn->ibc_active_txs);
2013
2014         kiblnd_handle_early_rxs(conn);
2015 }
2016
2017 void
2018 kiblnd_peer_connect_failed (kib_peer_t *peer, int active, int error)
2019 {
2020         CFS_LIST_HEAD    (zombies);
2021         unsigned long     flags;
2022
2023         LASSERT (error != 0);
2024         LASSERT (!cfs_in_interrupt());
2025
2026         write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2027
2028         if (active) {
2029                 LASSERT (peer->ibp_connecting > 0);
2030                 peer->ibp_connecting--;
2031         } else {
2032                 LASSERT (peer->ibp_accepting > 0);
2033                 peer->ibp_accepting--;
2034         }
2035
2036         if (peer->ibp_connecting != 0 ||
2037             peer->ibp_accepting != 0) {
2038                 /* another connection attempt under way... */
2039                 write_unlock_irqrestore(&kiblnd_data.kib_global_lock,
2040                                             flags);
2041                 return;
2042         }
2043
2044         if (cfs_list_empty(&peer->ibp_conns)) {
2045                 /* Take peer's blocked transmits to complete with error */
2046                 cfs_list_add(&zombies, &peer->ibp_tx_queue);
2047                 cfs_list_del_init(&peer->ibp_tx_queue);
2048
2049                 if (kiblnd_peer_active(peer))
2050                         kiblnd_unlink_peer_locked(peer);
2051
2052                 peer->ibp_error = error;
2053         } else {
2054                 /* Can't have blocked transmits if there are connections */
2055                 LASSERT (cfs_list_empty(&peer->ibp_tx_queue));
2056         }
2057
2058         write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2059
2060         kiblnd_peer_notify(peer);
2061
2062         if (cfs_list_empty (&zombies))
2063                 return;
2064
2065         CNETERR("Deleting messages for %s: connection failed\n",
2066                 libcfs_nid2str(peer->ibp_nid));
2067
2068         kiblnd_txlist_done(peer->ibp_ni, &zombies, -EHOSTUNREACH);
2069 }
2070
2071 void
2072 kiblnd_connreq_done(kib_conn_t *conn, int status)
2073 {
2074         kib_peer_t        *peer = conn->ibc_peer;
2075         kib_tx_t          *tx;
2076         cfs_list_t         txs;
2077         unsigned long      flags;
2078         int                active;
2079
2080         active = (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2081
2082         CDEBUG(D_NET,"%s: active(%d), version(%x), status(%d)\n",
2083                libcfs_nid2str(peer->ibp_nid), active,
2084                conn->ibc_version, status);
2085
2086         LASSERT (!cfs_in_interrupt());
2087         LASSERT ((conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT &&
2088                   peer->ibp_connecting > 0) ||
2089                  (conn->ibc_state == IBLND_CONN_PASSIVE_WAIT &&
2090                   peer->ibp_accepting > 0));
2091
2092         LIBCFS_FREE(conn->ibc_connvars, sizeof(*conn->ibc_connvars));
2093         conn->ibc_connvars = NULL;
2094
2095         if (status != 0) {
2096                 /* failed to establish connection */
2097                 kiblnd_peer_connect_failed(peer, active, status);
2098                 kiblnd_finalise_conn(conn);
2099                 return;
2100         }
2101
2102         /* connection established */
2103         write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2104
2105         conn->ibc_last_send = jiffies;
2106         kiblnd_set_conn_state(conn, IBLND_CONN_ESTABLISHED);
2107         kiblnd_peer_alive(peer);
2108
2109         /* Add conn to peer's list and nuke any dangling conns from a different
2110          * peer instance... */
2111         kiblnd_conn_addref(conn);               /* +1 ref for ibc_list */
2112         cfs_list_add(&conn->ibc_list, &peer->ibp_conns);
2113         if (active)
2114                 peer->ibp_connecting--;
2115         else
2116                 peer->ibp_accepting--;
2117
2118         if (peer->ibp_version == 0) {
2119                 peer->ibp_version     = conn->ibc_version;
2120                 peer->ibp_incarnation = conn->ibc_incarnation;
2121         }
2122
2123         if (peer->ibp_version     != conn->ibc_version ||
2124             peer->ibp_incarnation != conn->ibc_incarnation) {
2125                 kiblnd_close_stale_conns_locked(peer, conn->ibc_version,
2126                                                 conn->ibc_incarnation);
2127                 peer->ibp_version     = conn->ibc_version;
2128                 peer->ibp_incarnation = conn->ibc_incarnation;
2129         }
2130
2131         /* grab pending txs while I have the lock */
2132         cfs_list_add(&txs, &peer->ibp_tx_queue);
2133         cfs_list_del_init(&peer->ibp_tx_queue);
2134
2135         if (!kiblnd_peer_active(peer) ||        /* peer has been deleted */
2136             conn->ibc_comms_error != 0) {       /* error has happened already */
2137                 lnet_ni_t *ni = peer->ibp_ni;
2138
2139                 /* start to shut down connection */
2140                 kiblnd_close_conn_locked(conn, -ECONNABORTED);
2141                 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2142
2143                 kiblnd_txlist_done(ni, &txs, -ECONNABORTED);
2144
2145                 return;
2146         }
2147
2148         write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2149
2150         /* Schedule blocked txs */
2151         spin_lock(&conn->ibc_lock);
2152         while (!cfs_list_empty(&txs)) {
2153                 tx = cfs_list_entry(txs.next, kib_tx_t, tx_list);
2154                 cfs_list_del(&tx->tx_list);
2155
2156                 kiblnd_queue_tx_locked(tx, conn);
2157         }
2158         spin_unlock(&conn->ibc_lock);
2159
2160         kiblnd_check_sends(conn);
2161
2162         /* schedule blocked rxs */
2163         kiblnd_handle_early_rxs(conn);
2164 }
2165
2166 void
2167 kiblnd_reject(struct rdma_cm_id *cmid, kib_rej_t *rej)
2168 {
2169         int          rc;
2170
2171         rc = rdma_reject(cmid, rej, sizeof(*rej));
2172
2173         if (rc != 0)
2174                 CWARN("Error %d sending reject\n", rc);
2175 }
2176
2177 int
2178 kiblnd_passive_connect (struct rdma_cm_id *cmid, void *priv, int priv_nob)
2179 {
2180         rwlock_t                *g_lock = &kiblnd_data.kib_global_lock;
2181         kib_msg_t             *reqmsg = priv;
2182         kib_msg_t             *ackmsg;
2183         kib_dev_t             *ibdev;
2184         kib_peer_t            *peer;
2185         kib_peer_t            *peer2;
2186         kib_conn_t            *conn;
2187         lnet_ni_t             *ni  = NULL;
2188         kib_net_t             *net = NULL;
2189         lnet_nid_t             nid;
2190         struct rdma_conn_param cp;
2191         kib_rej_t              rej;
2192         int                    version = IBLND_MSG_VERSION;
2193         unsigned long          flags;
2194         int                    rc;
2195         struct sockaddr_in    *peer_addr;
2196         LASSERT (!cfs_in_interrupt());
2197
2198         /* cmid inherits 'context' from the corresponding listener id */
2199         ibdev = (kib_dev_t *)cmid->context;
2200         LASSERT (ibdev != NULL);
2201
2202         memset(&rej, 0, sizeof(rej));
2203         rej.ibr_magic                = IBLND_MSG_MAGIC;
2204         rej.ibr_why                  = IBLND_REJECT_FATAL;
2205         rej.ibr_cp.ibcp_max_msg_size = IBLND_MSG_SIZE;
2206
2207         peer_addr = (struct sockaddr_in *)&(cmid->route.addr.dst_addr);
2208         if (*kiblnd_tunables.kib_require_priv_port &&
2209             ntohs(peer_addr->sin_port) >= PROT_SOCK) {
2210                 __u32 ip = ntohl(peer_addr->sin_addr.s_addr);
2211                 CERROR("Peer's port (%u.%u.%u.%u:%hu) is not privileged\n",
2212                        HIPQUAD(ip), ntohs(peer_addr->sin_port));
2213                 goto failed;
2214         }
2215
2216         if (priv_nob < offsetof(kib_msg_t, ibm_type)) {
2217                 CERROR("Short connection request\n");
2218                 goto failed;
2219         }
2220
2221         /* Future protocol version compatibility support!  If the
2222          * o2iblnd-specific protocol changes, or when LNET unifies
2223          * protocols over all LNDs, the initial connection will
2224          * negotiate a protocol version.  I trap this here to avoid
2225          * console errors; the reject tells the peer which protocol I
2226          * speak. */
2227         if (reqmsg->ibm_magic == LNET_PROTO_MAGIC ||
2228             reqmsg->ibm_magic == __swab32(LNET_PROTO_MAGIC))
2229                 goto failed;
2230         if (reqmsg->ibm_magic == IBLND_MSG_MAGIC &&
2231             reqmsg->ibm_version != IBLND_MSG_VERSION &&
2232             reqmsg->ibm_version != IBLND_MSG_VERSION_1)
2233                 goto failed;
2234         if (reqmsg->ibm_magic == __swab32(IBLND_MSG_MAGIC) &&
2235             reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION) &&
2236             reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION_1))
2237                 goto failed;
2238
2239         rc = kiblnd_unpack_msg(reqmsg, priv_nob);
2240         if (rc != 0) {
2241                 CERROR("Can't parse connection request: %d\n", rc);
2242                 goto failed;
2243         }
2244
2245         nid = reqmsg->ibm_srcnid;
2246         ni  = lnet_net2ni(LNET_NIDNET(reqmsg->ibm_dstnid));
2247
2248         if (ni != NULL) {
2249                 net = (kib_net_t *)ni->ni_data;
2250                 rej.ibr_incarnation = net->ibn_incarnation;
2251         }
2252
2253         if (ni == NULL ||                         /* no matching net */
2254             ni->ni_nid != reqmsg->ibm_dstnid ||   /* right NET, wrong NID! */
2255             net->ibn_dev != ibdev) {              /* wrong device */
2256                 CERROR("Can't accept %s on %s (%s:%d:%u.%u.%u.%u): "
2257                        "bad dst nid %s\n", libcfs_nid2str(nid),
2258                        ni == NULL ? "NA" : libcfs_nid2str(ni->ni_nid),
2259                        ibdev->ibd_ifname, ibdev->ibd_nnets,
2260                        HIPQUAD(ibdev->ibd_ifip),
2261                        libcfs_nid2str(reqmsg->ibm_dstnid));
2262
2263                 goto failed;
2264         }
2265
2266        /* check time stamp as soon as possible */
2267         if (reqmsg->ibm_dststamp != 0 &&
2268             reqmsg->ibm_dststamp != net->ibn_incarnation) {
2269                 CWARN("Stale connection request\n");
2270                 rej.ibr_why = IBLND_REJECT_CONN_STALE;
2271                 goto failed;
2272         }
2273
2274         /* I can accept peer's version */
2275         version = reqmsg->ibm_version;
2276
2277         if (reqmsg->ibm_type != IBLND_MSG_CONNREQ) {
2278                 CERROR("Unexpected connreq msg type: %x from %s\n",
2279                        reqmsg->ibm_type, libcfs_nid2str(nid));
2280                 goto failed;
2281         }
2282
2283         if (reqmsg->ibm_u.connparams.ibcp_queue_depth !=
2284             IBLND_MSG_QUEUE_SIZE(version)) {
2285                 CERROR("Can't accept %s: incompatible queue depth %d (%d wanted)\n",
2286                        libcfs_nid2str(nid), reqmsg->ibm_u.connparams.ibcp_queue_depth,
2287                        IBLND_MSG_QUEUE_SIZE(version));
2288
2289                 if (version == IBLND_MSG_VERSION)
2290                         rej.ibr_why = IBLND_REJECT_MSG_QUEUE_SIZE;
2291
2292                 goto failed;
2293         }
2294
2295         if (reqmsg->ibm_u.connparams.ibcp_max_frags !=
2296             IBLND_RDMA_FRAGS(version)) {
2297                 CERROR("Can't accept %s(version %x): "
2298                        "incompatible max_frags %d (%d wanted)\n",
2299                        libcfs_nid2str(nid), version,
2300                        reqmsg->ibm_u.connparams.ibcp_max_frags,
2301                        IBLND_RDMA_FRAGS(version));
2302
2303                 if (version == IBLND_MSG_VERSION)
2304                         rej.ibr_why = IBLND_REJECT_RDMA_FRAGS;
2305
2306                 goto failed;
2307
2308         }
2309
2310         if (reqmsg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
2311                 CERROR("Can't accept %s: message size %d too big (%d max)\n",
2312                        libcfs_nid2str(nid),
2313                        reqmsg->ibm_u.connparams.ibcp_max_msg_size,
2314                        IBLND_MSG_SIZE);
2315                 goto failed;
2316         }
2317
2318         /* assume 'nid' is a new peer; create  */
2319         rc = kiblnd_create_peer(ni, &peer, nid);
2320         if (rc != 0) {
2321                 CERROR("Can't create peer for %s\n", libcfs_nid2str(nid));
2322                 rej.ibr_why = IBLND_REJECT_NO_RESOURCES;
2323                 goto failed;
2324         }
2325
2326         write_lock_irqsave(g_lock, flags);
2327
2328         peer2 = kiblnd_find_peer_locked(nid);
2329         if (peer2 != NULL) {
2330                 if (peer2->ibp_version == 0) {
2331                         peer2->ibp_version     = version;
2332                         peer2->ibp_incarnation = reqmsg->ibm_srcstamp;
2333                 }
2334
2335                 /* not the guy I've talked with */
2336                 if (peer2->ibp_incarnation != reqmsg->ibm_srcstamp ||
2337                     peer2->ibp_version     != version) {
2338                         kiblnd_close_peer_conns_locked(peer2, -ESTALE);
2339                         write_unlock_irqrestore(g_lock, flags);
2340
2341                         CWARN("Conn stale %s [old ver: %x, new ver: %x]\n",
2342                               libcfs_nid2str(nid), peer2->ibp_version, version);
2343
2344                         kiblnd_peer_decref(peer);
2345                         rej.ibr_why = IBLND_REJECT_CONN_STALE;
2346                         goto failed;
2347                 }
2348
2349                 /* tie-break connection race in favour of the higher NID */
2350                 if (peer2->ibp_connecting != 0 &&
2351                     nid < ni->ni_nid) {
2352                         write_unlock_irqrestore(g_lock, flags);
2353
2354                         CWARN("Conn race %s\n", libcfs_nid2str(peer2->ibp_nid));
2355
2356                         kiblnd_peer_decref(peer);
2357                         rej.ibr_why = IBLND_REJECT_CONN_RACE;
2358                         goto failed;
2359                 }
2360
2361                 peer2->ibp_accepting++;
2362                 kiblnd_peer_addref(peer2);
2363
2364                 write_unlock_irqrestore(g_lock, flags);
2365                 kiblnd_peer_decref(peer);
2366                 peer = peer2;
2367         } else {
2368                 /* Brand new peer */
2369                 LASSERT (peer->ibp_accepting == 0);
2370                 LASSERT (peer->ibp_version == 0 &&
2371                          peer->ibp_incarnation == 0);
2372
2373                 peer->ibp_accepting   = 1;
2374                 peer->ibp_version     = version;
2375                 peer->ibp_incarnation = reqmsg->ibm_srcstamp;
2376
2377                 /* I have a ref on ni that prevents it being shutdown */
2378                 LASSERT (net->ibn_shutdown == 0);
2379
2380                 kiblnd_peer_addref(peer);
2381                 cfs_list_add_tail(&peer->ibp_list, kiblnd_nid2peerlist(nid));
2382
2383                 write_unlock_irqrestore(g_lock, flags);
2384         }
2385
2386         conn = kiblnd_create_conn(peer, cmid, IBLND_CONN_PASSIVE_WAIT, version);
2387         if (conn == NULL) {
2388                 kiblnd_peer_connect_failed(peer, 0, -ENOMEM);
2389                 kiblnd_peer_decref(peer);
2390                 rej.ibr_why = IBLND_REJECT_NO_RESOURCES;
2391                 goto failed;
2392         }
2393
2394         /* conn now "owns" cmid, so I return success from here on to ensure the
2395          * CM callback doesn't destroy cmid. */
2396
2397         conn->ibc_incarnation      = reqmsg->ibm_srcstamp;
2398         conn->ibc_credits          = IBLND_MSG_QUEUE_SIZE(version);
2399         conn->ibc_reserved_credits = IBLND_MSG_QUEUE_SIZE(version);
2400         LASSERT (conn->ibc_credits + conn->ibc_reserved_credits + IBLND_OOB_MSGS(version)
2401                  <= IBLND_RX_MSGS(version));
2402
2403         ackmsg = &conn->ibc_connvars->cv_msg;
2404         memset(ackmsg, 0, sizeof(*ackmsg));
2405
2406         kiblnd_init_msg(ackmsg, IBLND_MSG_CONNACK,
2407                         sizeof(ackmsg->ibm_u.connparams));
2408         ackmsg->ibm_u.connparams.ibcp_queue_depth  = IBLND_MSG_QUEUE_SIZE(version);
2409         ackmsg->ibm_u.connparams.ibcp_max_msg_size = IBLND_MSG_SIZE;
2410         ackmsg->ibm_u.connparams.ibcp_max_frags    = IBLND_RDMA_FRAGS(version);
2411
2412         kiblnd_pack_msg(ni, ackmsg, version, 0, nid, reqmsg->ibm_srcstamp);
2413
2414         memset(&cp, 0, sizeof(cp));
2415         cp.private_data        = ackmsg;
2416         cp.private_data_len    = ackmsg->ibm_nob;
2417         cp.responder_resources = 0;             /* No atomic ops or RDMA reads */
2418         cp.initiator_depth     = 0;
2419         cp.flow_control        = 1;
2420         cp.retry_count         = *kiblnd_tunables.kib_retry_count;
2421         cp.rnr_retry_count     = *kiblnd_tunables.kib_rnr_retry_count;
2422
2423         CDEBUG(D_NET, "Accept %s\n", libcfs_nid2str(nid));
2424
2425         rc = rdma_accept(cmid, &cp);
2426         if (rc != 0) {
2427                 CERROR("Can't accept %s: %d\n", libcfs_nid2str(nid), rc);
2428                 rej.ibr_version = version;
2429                 rej.ibr_why     = IBLND_REJECT_FATAL;
2430
2431                 kiblnd_reject(cmid, &rej);
2432                 kiblnd_connreq_done(conn, rc);
2433                 kiblnd_conn_decref(conn);
2434         }
2435
2436         lnet_ni_decref(ni);
2437         return 0;
2438
2439  failed:
2440         if (ni != NULL)
2441                 lnet_ni_decref(ni);
2442
2443         rej.ibr_version = version;
2444         rej.ibr_cp.ibcp_queue_depth = IBLND_MSG_QUEUE_SIZE(version);
2445         rej.ibr_cp.ibcp_max_frags   = IBLND_RDMA_FRAGS(version);
2446         kiblnd_reject(cmid, &rej);
2447
2448         return -ECONNREFUSED;
2449 }
2450
2451 void
2452 kiblnd_reconnect (kib_conn_t *conn, int version,
2453                   __u64 incarnation, int why, kib_connparams_t *cp)
2454 {
2455         kib_peer_t    *peer = conn->ibc_peer;
2456         char          *reason;
2457         int            retry = 0;
2458         unsigned long  flags;
2459
2460         LASSERT (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2461         LASSERT (peer->ibp_connecting > 0);     /* 'conn' at least */
2462
2463         write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2464
2465         /* retry connection if it's still needed and no other connection
2466          * attempts (active or passive) are in progress
2467          * NB: reconnect is still needed even when ibp_tx_queue is
2468          * empty if ibp_version != version because reconnect may be
2469          * initiated by kiblnd_query() */
2470         if ((!cfs_list_empty(&peer->ibp_tx_queue) ||
2471              peer->ibp_version != version) &&
2472             peer->ibp_connecting == 1 &&
2473             peer->ibp_accepting == 0) {
2474                 retry = 1;
2475                 peer->ibp_connecting++;
2476
2477                 peer->ibp_version     = version;
2478                 peer->ibp_incarnation = incarnation;
2479         }
2480
2481         write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2482
2483         if (!retry)
2484                 return;
2485
2486         switch (why) {
2487         default:
2488                 reason = "Unknown";
2489                 break;
2490
2491         case IBLND_REJECT_CONN_STALE:
2492                 reason = "stale";
2493                 break;
2494
2495         case IBLND_REJECT_CONN_RACE:
2496                 reason = "conn race";
2497                 break;
2498
2499         case IBLND_REJECT_CONN_UNCOMPAT:
2500                 reason = "version negotiation";
2501                 break;
2502         }
2503
2504         CNETERR("%s: retrying (%s), %x, %x, "
2505                 "queue_dep: %d, max_frag: %d, msg_size: %d\n",
2506                 libcfs_nid2str(peer->ibp_nid),
2507                 reason, IBLND_MSG_VERSION, version,
2508                 cp != NULL? cp->ibcp_queue_depth :IBLND_MSG_QUEUE_SIZE(version),
2509                 cp != NULL? cp->ibcp_max_frags   : IBLND_RDMA_FRAGS(version),
2510                 cp != NULL? cp->ibcp_max_msg_size: IBLND_MSG_SIZE);
2511
2512         kiblnd_connect_peer(peer);
2513 }
2514
2515 void
2516 kiblnd_rejected (kib_conn_t *conn, int reason, void *priv, int priv_nob)
2517 {
2518         kib_peer_t    *peer = conn->ibc_peer;
2519
2520         LASSERT (!cfs_in_interrupt());
2521         LASSERT (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2522
2523         switch (reason) {
2524         case IB_CM_REJ_STALE_CONN:
2525                 kiblnd_reconnect(conn, IBLND_MSG_VERSION, 0,
2526                                  IBLND_REJECT_CONN_STALE, NULL);
2527                 break;
2528
2529         case IB_CM_REJ_INVALID_SERVICE_ID:
2530                 CNETERR("%s rejected: no listener at %d\n",
2531                         libcfs_nid2str(peer->ibp_nid),
2532                         *kiblnd_tunables.kib_service);
2533                 break;
2534
2535         case IB_CM_REJ_CONSUMER_DEFINED:
2536                 if (priv_nob >= offsetof(kib_rej_t, ibr_padding)) {
2537                         kib_rej_t        *rej         = priv;
2538                         kib_connparams_t *cp          = NULL;
2539                         int               flip        = 0;
2540                         __u64             incarnation = -1;
2541
2542                         /* NB. default incarnation is -1 because:
2543                          * a) V1 will ignore dst incarnation in connreq.
2544                          * b) V2 will provide incarnation while rejecting me,
2545                          *    -1 will be overwrote.
2546                          *
2547                          * if I try to connect to a V1 peer with V2 protocol,
2548                          * it rejected me then upgrade to V2, I have no idea
2549                          * about the upgrading and try to reconnect with V1,
2550                          * in this case upgraded V2 can find out I'm trying to
2551                          * talk to the old guy and reject me(incarnation is -1).
2552                          */
2553
2554                         if (rej->ibr_magic == __swab32(IBLND_MSG_MAGIC) ||
2555                             rej->ibr_magic == __swab32(LNET_PROTO_MAGIC)) {
2556                                 __swab32s(&rej->ibr_magic);
2557                                 __swab16s(&rej->ibr_version);
2558                                 flip = 1;
2559                         }
2560
2561                         if (priv_nob >= sizeof(kib_rej_t) &&
2562                             rej->ibr_version > IBLND_MSG_VERSION_1) {
2563                                 /* priv_nob is always 148 in current version
2564                                  * of OFED, so we still need to check version.
2565                                  * (define of IB_CM_REJ_PRIVATE_DATA_SIZE) */
2566                                 cp = &rej->ibr_cp;
2567
2568                                 if (flip) {
2569                                         __swab64s(&rej->ibr_incarnation);
2570                                         __swab16s(&cp->ibcp_queue_depth);
2571                                         __swab16s(&cp->ibcp_max_frags);
2572                                         __swab32s(&cp->ibcp_max_msg_size);
2573                                 }
2574
2575                                 incarnation = rej->ibr_incarnation;
2576                         }
2577
2578                         if (rej->ibr_magic != IBLND_MSG_MAGIC &&
2579                             rej->ibr_magic != LNET_PROTO_MAGIC) {
2580                                 CERROR("%s rejected: consumer defined fatal error\n",
2581                                        libcfs_nid2str(peer->ibp_nid));
2582                                 break;
2583                         }
2584
2585                         if (rej->ibr_version != IBLND_MSG_VERSION &&
2586                             rej->ibr_version != IBLND_MSG_VERSION_1) {
2587                                 CERROR("%s rejected: o2iblnd version %x error\n",
2588                                        libcfs_nid2str(peer->ibp_nid),
2589                                        rej->ibr_version);
2590                                 break;
2591                         }
2592
2593                         if (rej->ibr_why     == IBLND_REJECT_FATAL &&
2594                             rej->ibr_version == IBLND_MSG_VERSION_1) {
2595                                 CDEBUG(D_NET, "rejected by old version peer %s: %x\n",
2596                                        libcfs_nid2str(peer->ibp_nid), rej->ibr_version);
2597
2598                                 if (conn->ibc_version != IBLND_MSG_VERSION_1)
2599                                         rej->ibr_why = IBLND_REJECT_CONN_UNCOMPAT;
2600                         }
2601
2602                         switch (rej->ibr_why) {
2603                         case IBLND_REJECT_CONN_RACE:
2604                         case IBLND_REJECT_CONN_STALE:
2605                         case IBLND_REJECT_CONN_UNCOMPAT:
2606                                 kiblnd_reconnect(conn, rej->ibr_version,
2607                                                  incarnation, rej->ibr_why, cp);
2608                                 break;
2609
2610                         case IBLND_REJECT_MSG_QUEUE_SIZE:
2611                                 CERROR("%s rejected: incompatible message queue depth %d, %d\n",
2612                                        libcfs_nid2str(peer->ibp_nid), cp->ibcp_queue_depth,
2613                                        IBLND_MSG_QUEUE_SIZE(conn->ibc_version));
2614                                 break;
2615
2616                         case IBLND_REJECT_RDMA_FRAGS:
2617                                 CERROR("%s rejected: incompatible # of RDMA fragments %d, %d\n",
2618                                        libcfs_nid2str(peer->ibp_nid), cp->ibcp_max_frags,
2619                                        IBLND_RDMA_FRAGS(conn->ibc_version));
2620                                 break;
2621
2622                         case IBLND_REJECT_NO_RESOURCES:
2623                                 CERROR("%s rejected: o2iblnd no resources\n",
2624                                        libcfs_nid2str(peer->ibp_nid));
2625                                 break;
2626
2627                         case IBLND_REJECT_FATAL:
2628                                 CERROR("%s rejected: o2iblnd fatal error\n",
2629                                        libcfs_nid2str(peer->ibp_nid));
2630                                 break;
2631
2632                         default:
2633                                 CERROR("%s rejected: o2iblnd reason %d\n",
2634                                        libcfs_nid2str(peer->ibp_nid),
2635                                        rej->ibr_why);
2636                                 break;
2637                         }
2638                         break;
2639                 }
2640                 /* fall through */
2641         default:
2642                 CNETERR("%s rejected: reason %d, size %d\n",
2643                         libcfs_nid2str(peer->ibp_nid), reason, priv_nob);
2644                 break;
2645         }
2646
2647         kiblnd_connreq_done(conn, -ECONNREFUSED);
2648 }
2649
2650 void
2651 kiblnd_check_connreply (kib_conn_t *conn, void *priv, int priv_nob)
2652 {
2653         kib_peer_t    *peer = conn->ibc_peer;
2654         lnet_ni_t     *ni   = peer->ibp_ni;
2655         kib_net_t     *net  = ni->ni_data;
2656         kib_msg_t     *msg  = priv;
2657         int            ver  = conn->ibc_version;
2658         int            rc   = kiblnd_unpack_msg(msg, priv_nob);
2659         unsigned long  flags;
2660
2661         LASSERT (net != NULL);
2662
2663         if (rc != 0) {
2664                 CERROR("Can't unpack connack from %s: %d\n",
2665                        libcfs_nid2str(peer->ibp_nid), rc);
2666                 goto failed;
2667         }
2668
2669         if (msg->ibm_type != IBLND_MSG_CONNACK) {
2670                 CERROR("Unexpected message %d from %s\n",
2671                        msg->ibm_type, libcfs_nid2str(peer->ibp_nid));
2672                 rc = -EPROTO;
2673                 goto failed;
2674         }
2675
2676         if (ver != msg->ibm_version) {
2677                 CERROR("%s replied version %x is different with "
2678                        "requested version %x\n",
2679                        libcfs_nid2str(peer->ibp_nid), msg->ibm_version, ver);
2680                 rc = -EPROTO;
2681                 goto failed;
2682         }
2683
2684         if (msg->ibm_u.connparams.ibcp_queue_depth !=
2685             IBLND_MSG_QUEUE_SIZE(ver)) {
2686                 CERROR("%s has incompatible queue depth %d(%d wanted)\n",
2687                        libcfs_nid2str(peer->ibp_nid),
2688                        msg->ibm_u.connparams.ibcp_queue_depth,
2689                        IBLND_MSG_QUEUE_SIZE(ver));
2690                 rc = -EPROTO;
2691                 goto failed;
2692         }
2693
2694         if (msg->ibm_u.connparams.ibcp_max_frags !=
2695             IBLND_RDMA_FRAGS(ver)) {
2696                 CERROR("%s has incompatible max_frags %d (%d wanted)\n",
2697                        libcfs_nid2str(peer->ibp_nid),
2698                        msg->ibm_u.connparams.ibcp_max_frags,
2699                        IBLND_RDMA_FRAGS(ver));
2700                 rc = -EPROTO;
2701                 goto failed;
2702         }
2703
2704         if (msg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
2705                 CERROR("%s max message size %d too big (%d max)\n",
2706                        libcfs_nid2str(peer->ibp_nid),
2707                        msg->ibm_u.connparams.ibcp_max_msg_size,
2708                        IBLND_MSG_SIZE);
2709                 rc = -EPROTO;
2710                 goto failed;
2711         }
2712
2713         read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2714         if (msg->ibm_dstnid == ni->ni_nid &&
2715             msg->ibm_dststamp == net->ibn_incarnation)
2716                 rc = 0;
2717         else
2718                 rc = -ESTALE;
2719         read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2720
2721         if (rc != 0) {
2722                 CERROR("Bad connection reply from %s, rc = %d, "
2723                        "version: %x max_frags: %d\n",
2724                        libcfs_nid2str(peer->ibp_nid), rc,
2725                        msg->ibm_version, msg->ibm_u.connparams.ibcp_max_frags);
2726                 goto failed;
2727         }
2728
2729         conn->ibc_incarnation      = msg->ibm_srcstamp;
2730         conn->ibc_credits          =
2731         conn->ibc_reserved_credits = IBLND_MSG_QUEUE_SIZE(ver);
2732         LASSERT (conn->ibc_credits + conn->ibc_reserved_credits + IBLND_OOB_MSGS(ver)
2733                  <= IBLND_RX_MSGS(ver));
2734
2735         kiblnd_connreq_done(conn, 0);
2736         return;
2737
2738  failed:
2739         /* NB My QP has already established itself, so I handle anything going
2740          * wrong here by setting ibc_comms_error.
2741          * kiblnd_connreq_done(0) moves the conn state to ESTABLISHED, but then
2742          * immediately tears it down. */
2743
2744         LASSERT (rc != 0);
2745         conn->ibc_comms_error = rc;
2746         kiblnd_connreq_done(conn, 0);
2747 }
2748
2749 int
2750 kiblnd_active_connect (struct rdma_cm_id *cmid)
2751 {
2752         kib_peer_t              *peer = (kib_peer_t *)cmid->context;
2753         kib_conn_t              *conn;
2754         kib_msg_t               *msg;
2755         struct rdma_conn_param   cp;
2756         int                      version;
2757         __u64                    incarnation;
2758         unsigned long            flags;
2759         int                      rc;
2760
2761         read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2762
2763         incarnation = peer->ibp_incarnation;
2764         version     = (peer->ibp_version == 0) ? IBLND_MSG_VERSION :
2765                                                  peer->ibp_version;
2766
2767         read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2768
2769         conn = kiblnd_create_conn(peer, cmid, IBLND_CONN_ACTIVE_CONNECT, version);
2770         if (conn == NULL) {
2771                 kiblnd_peer_connect_failed(peer, 1, -ENOMEM);
2772                 kiblnd_peer_decref(peer); /* lose cmid's ref */
2773                 return -ENOMEM;
2774         }
2775
2776         /* conn "owns" cmid now, so I return success from here on to ensure the
2777          * CM callback doesn't destroy cmid. conn also takes over cmid's ref
2778          * on peer */
2779
2780         msg = &conn->ibc_connvars->cv_msg;
2781
2782         memset(msg, 0, sizeof(*msg));
2783         kiblnd_init_msg(msg, IBLND_MSG_CONNREQ, sizeof(msg->ibm_u.connparams));
2784         msg->ibm_u.connparams.ibcp_queue_depth  = IBLND_MSG_QUEUE_SIZE(version);
2785         msg->ibm_u.connparams.ibcp_max_frags    = IBLND_RDMA_FRAGS(version);
2786         msg->ibm_u.connparams.ibcp_max_msg_size = IBLND_MSG_SIZE;
2787
2788         kiblnd_pack_msg(peer->ibp_ni, msg, version,
2789                         0, peer->ibp_nid, incarnation);
2790
2791         memset(&cp, 0, sizeof(cp));
2792         cp.private_data        = msg;
2793         cp.private_data_len    = msg->ibm_nob;
2794         cp.responder_resources = 0;             /* No atomic ops or RDMA reads */
2795         cp.initiator_depth     = 0;
2796         cp.flow_control        = 1;
2797         cp.retry_count         = *kiblnd_tunables.kib_retry_count;
2798         cp.rnr_retry_count     = *kiblnd_tunables.kib_rnr_retry_count;
2799
2800         LASSERT(cmid->context == (void *)conn);
2801         LASSERT(conn->ibc_cmid == cmid);
2802
2803         rc = rdma_connect(cmid, &cp);
2804         if (rc != 0) {
2805                 CERROR("Can't connect to %s: %d\n",
2806                        libcfs_nid2str(peer->ibp_nid), rc);
2807                 kiblnd_connreq_done(conn, rc);
2808                 kiblnd_conn_decref(conn);
2809         }
2810
2811         return 0;
2812 }
2813
2814 int
2815 kiblnd_cm_callback(struct rdma_cm_id *cmid, struct rdma_cm_event *event)
2816 {
2817         kib_peer_t  *peer;
2818         kib_conn_t  *conn;
2819         int          rc;
2820
2821         switch (event->event) {
2822         default:
2823                 CERROR("Unexpected event: %d, status: %d\n",
2824                        event->event, event->status);
2825                 LBUG();
2826
2827         case RDMA_CM_EVENT_CONNECT_REQUEST:
2828                 /* destroy cmid on failure */
2829                 rc = kiblnd_passive_connect(cmid,
2830                                             (void *)KIBLND_CONN_PARAM(event),
2831                                             KIBLND_CONN_PARAM_LEN(event));
2832                 CDEBUG(D_NET, "connreq: %d\n", rc);
2833                 return rc;
2834
2835         case RDMA_CM_EVENT_ADDR_ERROR:
2836                 peer = (kib_peer_t *)cmid->context;
2837                 CNETERR("%s: ADDR ERROR %d\n",
2838                        libcfs_nid2str(peer->ibp_nid), event->status);
2839                 kiblnd_peer_connect_failed(peer, 1, -EHOSTUNREACH);
2840                 kiblnd_peer_decref(peer);
2841                 return -EHOSTUNREACH;      /* rc != 0 destroys cmid */
2842
2843         case RDMA_CM_EVENT_ADDR_RESOLVED:
2844                 peer = (kib_peer_t *)cmid->context;
2845
2846                 CDEBUG(D_NET,"%s Addr resolved: %d\n",
2847                        libcfs_nid2str(peer->ibp_nid), event->status);
2848
2849                 if (event->status != 0) {
2850                         CNETERR("Can't resolve address for %s: %d\n",
2851                                 libcfs_nid2str(peer->ibp_nid), event->status);
2852                         rc = event->status;
2853                 } else {
2854                         rc = rdma_resolve_route(
2855                                 cmid, *kiblnd_tunables.kib_timeout * 1000);
2856                         if (rc == 0)
2857                                 return 0;
2858                         /* Can't initiate route resolution */
2859                         CERROR("Can't resolve route for %s: %d\n",
2860                                libcfs_nid2str(peer->ibp_nid), rc);
2861                 }
2862                 kiblnd_peer_connect_failed(peer, 1, rc);
2863                 kiblnd_peer_decref(peer);
2864                 return rc;                      /* rc != 0 destroys cmid */
2865
2866         case RDMA_CM_EVENT_ROUTE_ERROR:
2867                 peer = (kib_peer_t *)cmid->context;
2868                 CNETERR("%s: ROUTE ERROR %d\n",
2869                         libcfs_nid2str(peer->ibp_nid), event->status);
2870                 kiblnd_peer_connect_failed(peer, 1, -EHOSTUNREACH);
2871                 kiblnd_peer_decref(peer);
2872                 return -EHOSTUNREACH;           /* rc != 0 destroys cmid */
2873
2874         case RDMA_CM_EVENT_ROUTE_RESOLVED:
2875                 peer = (kib_peer_t *)cmid->context;
2876                 CDEBUG(D_NET,"%s Route resolved: %d\n",
2877                        libcfs_nid2str(peer->ibp_nid), event->status);
2878
2879                 if (event->status == 0)
2880                         return kiblnd_active_connect(cmid);
2881
2882                 CNETERR("Can't resolve route for %s: %d\n",
2883                        libcfs_nid2str(peer->ibp_nid), event->status);
2884                 kiblnd_peer_connect_failed(peer, 1, event->status);
2885                 kiblnd_peer_decref(peer);
2886                 return event->status;           /* rc != 0 destroys cmid */
2887
2888         case RDMA_CM_EVENT_UNREACHABLE:
2889                 conn = (kib_conn_t *)cmid->context;
2890                 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
2891                         conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);
2892                 CNETERR("%s: UNREACHABLE %d\n",
2893                        libcfs_nid2str(conn->ibc_peer->ibp_nid), event->status);
2894                 kiblnd_connreq_done(conn, -ENETDOWN);
2895                 kiblnd_conn_decref(conn);
2896                 return 0;
2897
2898         case RDMA_CM_EVENT_CONNECT_ERROR:
2899                 conn = (kib_conn_t *)cmid->context;
2900                 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
2901                         conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);
2902                 CNETERR("%s: CONNECT ERROR %d\n",
2903                         libcfs_nid2str(conn->ibc_peer->ibp_nid), event->status);
2904                 kiblnd_connreq_done(conn, -ENOTCONN);
2905                 kiblnd_conn_decref(conn);
2906                 return 0;
2907
2908         case RDMA_CM_EVENT_REJECTED:
2909                 conn = (kib_conn_t *)cmid->context;
2910                 switch (conn->ibc_state) {
2911                 default:
2912                         LBUG();
2913
2914                 case IBLND_CONN_PASSIVE_WAIT:
2915                         CERROR ("%s: REJECTED %d\n",
2916                                 libcfs_nid2str(conn->ibc_peer->ibp_nid),
2917                                 event->status);
2918                         kiblnd_connreq_done(conn, -ECONNRESET);
2919                         break;
2920
2921                 case IBLND_CONN_ACTIVE_CONNECT:
2922                         kiblnd_rejected(conn, event->status,
2923                                         (void *)KIBLND_CONN_PARAM(event),
2924                                         KIBLND_CONN_PARAM_LEN(event));
2925                         break;
2926                 }
2927                 kiblnd_conn_decref(conn);
2928                 return 0;
2929
2930         case RDMA_CM_EVENT_ESTABLISHED:
2931                 conn = (kib_conn_t *)cmid->context;
2932                 switch (conn->ibc_state) {
2933                 default:
2934                         LBUG();
2935
2936                 case IBLND_CONN_PASSIVE_WAIT:
2937                         CDEBUG(D_NET, "ESTABLISHED (passive): %s\n",
2938                                libcfs_nid2str(conn->ibc_peer->ibp_nid));
2939                         kiblnd_connreq_done(conn, 0);
2940                         break;
2941
2942                 case IBLND_CONN_ACTIVE_CONNECT:
2943                         CDEBUG(D_NET, "ESTABLISHED(active): %s\n",
2944                                libcfs_nid2str(conn->ibc_peer->ibp_nid));
2945                         kiblnd_check_connreply(conn,
2946                                                (void *)KIBLND_CONN_PARAM(event),
2947                                                KIBLND_CONN_PARAM_LEN(event));
2948                         break;
2949                 }
2950                 /* net keeps its ref on conn! */
2951                 return 0;
2952
2953 #ifdef HAVE_OFED_RDMA_CMEV_TIMEWAIT_EXIT
2954         case RDMA_CM_EVENT_TIMEWAIT_EXIT:
2955                 CDEBUG(D_NET, "Ignore TIMEWAIT_EXIT event\n");
2956                 return 0;
2957 #endif
2958         case RDMA_CM_EVENT_DISCONNECTED:
2959                 conn = (kib_conn_t *)cmid->context;
2960                 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
2961                         CERROR("%s DISCONNECTED\n",
2962                                libcfs_nid2str(conn->ibc_peer->ibp_nid));
2963                         kiblnd_connreq_done(conn, -ECONNRESET);
2964                 } else {
2965                         kiblnd_close_conn(conn, 0);
2966                 }
2967                 kiblnd_conn_decref(conn);
2968                 cmid->context = NULL;
2969                 return 0;
2970
2971         case RDMA_CM_EVENT_DEVICE_REMOVAL:
2972                 LCONSOLE_ERROR_MSG(0x131,
2973                                    "Received notification of device removal\n"
2974                                    "Please shutdown LNET to allow this to proceed\n");
2975                 /* Can't remove network from underneath LNET for now, so I have
2976                  * to ignore this */
2977                 return 0;
2978
2979 #ifdef HAVE_OFED_RDMA_CMEV_ADDRCHANGE
2980         case RDMA_CM_EVENT_ADDR_CHANGE:
2981                 LCONSOLE_INFO("Physical link changed (eg hca/port)\n");
2982                 return 0;
2983 #endif
2984         }
2985 }
2986
2987 static int
2988 kiblnd_check_txs_locked(kib_conn_t *conn, cfs_list_t *txs)
2989 {
2990         kib_tx_t          *tx;
2991         cfs_list_t        *ttmp;
2992
2993         cfs_list_for_each (ttmp, txs) {
2994                 tx = cfs_list_entry (ttmp, kib_tx_t, tx_list);
2995
2996                 if (txs != &conn->ibc_active_txs) {
2997                         LASSERT (tx->tx_queued);
2998                 } else {
2999                         LASSERT (!tx->tx_queued);
3000                         LASSERT (tx->tx_waiting || tx->tx_sending != 0);
3001                 }
3002
3003                 if (cfs_time_aftereq (jiffies, tx->tx_deadline)) {
3004                         CERROR("Timed out tx: %s, %lu seconds\n",
3005                                kiblnd_queue2str(conn, txs),
3006                                cfs_duration_sec(jiffies - tx->tx_deadline));
3007                         return 1;
3008                 }
3009         }
3010
3011         return 0;
3012 }
3013
3014 static int
3015 kiblnd_conn_timed_out_locked(kib_conn_t *conn)
3016 {
3017         return  kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue) ||
3018                 kiblnd_check_txs_locked(conn, &conn->ibc_tx_noops) ||
3019                 kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue_rsrvd) ||
3020                 kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue_nocred) ||
3021                 kiblnd_check_txs_locked(conn, &conn->ibc_active_txs);
3022 }
3023
3024 void
3025 kiblnd_check_conns (int idx)
3026 {
3027         CFS_LIST_HEAD (closes);
3028         CFS_LIST_HEAD (checksends);
3029         cfs_list_t    *peers = &kiblnd_data.kib_peers[idx];
3030         cfs_list_t    *ptmp;
3031         kib_peer_t    *peer;
3032         kib_conn_t    *conn;
3033         cfs_list_t    *ctmp;
3034         unsigned long  flags;
3035
3036         /* NB. We expect to have a look at all the peers and not find any
3037          * RDMAs to time out, so we just use a shared lock while we
3038          * take a look... */
3039         read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
3040
3041         cfs_list_for_each (ptmp, peers) {
3042                 peer = cfs_list_entry (ptmp, kib_peer_t, ibp_list);
3043
3044                 cfs_list_for_each (ctmp, &peer->ibp_conns) {
3045                         int timedout;
3046                         int sendnoop;
3047
3048                         conn = cfs_list_entry(ctmp, kib_conn_t, ibc_list);
3049
3050                         LASSERT (conn->ibc_state == IBLND_CONN_ESTABLISHED);
3051
3052                         spin_lock(&conn->ibc_lock);
3053
3054                         sendnoop = kiblnd_need_noop(conn);
3055                         timedout = kiblnd_conn_timed_out_locked(conn);
3056                         if (!sendnoop && !timedout) {
3057                                 spin_unlock(&conn->ibc_lock);
3058                                 continue;
3059                         }
3060
3061                         if (timedout) {
3062                                 CERROR("Timed out RDMA with %s (%lu): "
3063                                        "c: %u, oc: %u, rc: %u\n",
3064                                        libcfs_nid2str(peer->ibp_nid),
3065                                        cfs_duration_sec(cfs_time_current() -
3066                                                         peer->ibp_last_alive),
3067                                        conn->ibc_credits,
3068                                        conn->ibc_outstanding_credits,
3069                                        conn->ibc_reserved_credits);
3070                                 cfs_list_add(&conn->ibc_connd_list, &closes);
3071                         } else {
3072                                 cfs_list_add(&conn->ibc_connd_list,
3073                                              &checksends);
3074                         }
3075                         /* +ref for 'closes' or 'checksends' */
3076                         kiblnd_conn_addref(conn);
3077
3078                         spin_unlock(&conn->ibc_lock);
3079                 }
3080         }
3081
3082         read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
3083
3084         /* Handle timeout by closing the whole
3085          * connection. We can only be sure RDMA activity
3086          * has ceased once the QP has been modified. */
3087         while (!cfs_list_empty(&closes)) {
3088                 conn = cfs_list_entry(closes.next,
3089                                       kib_conn_t, ibc_connd_list);
3090                 cfs_list_del(&conn->ibc_connd_list);
3091                 kiblnd_close_conn(conn, -ETIMEDOUT);
3092                 kiblnd_conn_decref(conn);
3093         }
3094
3095         /* In case we have enough credits to return via a
3096          * NOOP, but there were no non-blocking tx descs
3097          * free to do it last time... */
3098         while (!cfs_list_empty(&checksends)) {
3099                 conn = cfs_list_entry(checksends.next,
3100                                       kib_conn_t, ibc_connd_list);
3101                 cfs_list_del(&conn->ibc_connd_list);
3102                 kiblnd_check_sends(conn);
3103                 kiblnd_conn_decref(conn);
3104         }
3105 }
3106
3107 void
3108 kiblnd_disconnect_conn (kib_conn_t *conn)
3109 {
3110         LASSERT (!cfs_in_interrupt());
3111         LASSERT (current == kiblnd_data.kib_connd);
3112         LASSERT (conn->ibc_state == IBLND_CONN_CLOSING);
3113
3114         rdma_disconnect(conn->ibc_cmid);
3115         kiblnd_finalise_conn(conn);
3116
3117         kiblnd_peer_notify(conn->ibc_peer);
3118 }
3119
3120 int
3121 kiblnd_connd (void *arg)
3122 {
3123         cfs_waitlink_t     wait;
3124         unsigned long      flags;
3125         kib_conn_t        *conn;
3126         int                timeout;
3127         int                i;
3128         int                dropped_lock;
3129         int                peer_index = 0;
3130         unsigned long      deadline = jiffies;
3131
3132         cfs_daemonize ("kiblnd_connd");
3133         cfs_block_allsigs ();
3134
3135         cfs_waitlink_init (&wait);
3136         kiblnd_data.kib_connd = current;
3137
3138         spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
3139
3140         while (!kiblnd_data.kib_shutdown) {
3141
3142                 dropped_lock = 0;
3143
3144                 if (!cfs_list_empty (&kiblnd_data.kib_connd_zombies)) {
3145                         conn = cfs_list_entry(kiblnd_data. \
3146                                               kib_connd_zombies.next,
3147                                               kib_conn_t, ibc_list);
3148                         cfs_list_del(&conn->ibc_list);
3149
3150                         spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock,
3151                                                flags);
3152                         dropped_lock = 1;
3153
3154                         kiblnd_destroy_conn(conn);
3155
3156                         spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
3157                 }
3158
3159                 if (!cfs_list_empty(&kiblnd_data.kib_connd_conns)) {
3160                         conn = cfs_list_entry(kiblnd_data.kib_connd_conns.next,
3161                                               kib_conn_t, ibc_list);
3162                         cfs_list_del(&conn->ibc_list);
3163
3164                         spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock,
3165                                                flags);
3166                         dropped_lock = 1;
3167
3168                         kiblnd_disconnect_conn(conn);
3169                         kiblnd_conn_decref(conn);
3170
3171                         spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
3172                 }
3173
3174                 /* careful with the jiffy wrap... */
3175                 timeout = (int)(deadline - jiffies);
3176                 if (timeout <= 0) {
3177                         const int n = 4;
3178                         const int p = 1;
3179                         int       chunk = kiblnd_data.kib_peer_hash_size;
3180
3181                         spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock, flags);
3182                         dropped_lock = 1;
3183
3184                         /* Time to check for RDMA timeouts on a few more
3185                          * peers: I do checks every 'p' seconds on a
3186                          * proportion of the peer table and I need to check
3187                          * every connection 'n' times within a timeout
3188                          * interval, to ensure I detect a timeout on any
3189                          * connection within (n+1)/n times the timeout
3190                          * interval. */
3191
3192                         if (*kiblnd_tunables.kib_timeout > n * p)
3193                                 chunk = (chunk * n * p) /
3194                                         *kiblnd_tunables.kib_timeout;
3195                         if (chunk == 0)
3196                                 chunk = 1;
3197
3198                         for (i = 0; i < chunk; i++) {
3199                                 kiblnd_check_conns(peer_index);
3200                                 peer_index = (peer_index + 1) %
3201                                              kiblnd_data.kib_peer_hash_size;
3202                         }
3203
3204                         deadline += p * CFS_HZ;
3205                         spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
3206                 }
3207
3208                 if (dropped_lock)
3209                         continue;
3210
3211                 /* Nothing to do for 'timeout'  */
3212                 cfs_set_current_state(CFS_TASK_INTERRUPTIBLE);
3213                 cfs_waitq_add(&kiblnd_data.kib_connd_waitq, &wait);
3214                 spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock, flags);
3215
3216                 cfs_waitq_timedwait(&wait, CFS_TASK_INTERRUPTIBLE, timeout);
3217
3218                 cfs_set_current_state(CFS_TASK_RUNNING);
3219                 cfs_waitq_del(&kiblnd_data.kib_connd_waitq, &wait);
3220                 spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
3221         }
3222
3223         spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock, flags);
3224
3225         kiblnd_thread_fini();
3226         return 0;
3227 }
3228
3229 void
3230 kiblnd_qp_event(struct ib_event *event, void *arg)
3231 {
3232         kib_conn_t *conn = arg;
3233
3234         switch (event->event) {
3235         case IB_EVENT_COMM_EST:
3236                 CDEBUG(D_NET, "%s established\n",
3237                        libcfs_nid2str(conn->ibc_peer->ibp_nid));
3238                 return;
3239
3240         default:
3241                 CERROR("%s: Async QP event type %d\n",
3242                        libcfs_nid2str(conn->ibc_peer->ibp_nid), event->event);
3243                 return;
3244         }
3245 }
3246
3247 void
3248 kiblnd_complete (struct ib_wc *wc)
3249 {
3250         switch (kiblnd_wreqid2type(wc->wr_id)) {
3251         default:
3252                 LBUG();
3253
3254         case IBLND_WID_RDMA:
3255                 /* We only get RDMA completion notification if it fails.  All
3256                  * subsequent work items, including the final SEND will fail
3257                  * too.  However we can't print out any more info about the
3258                  * failing RDMA because 'tx' might be back on the idle list or
3259                  * even reused already if we didn't manage to post all our work
3260                  * items */
3261                 CNETERR("RDMA (tx: %p) failed: %d\n",
3262                         kiblnd_wreqid2ptr(wc->wr_id), wc->status);
3263                 return;
3264
3265         case IBLND_WID_TX:
3266                 kiblnd_tx_complete(kiblnd_wreqid2ptr(wc->wr_id), wc->status);
3267                 return;
3268
3269         case IBLND_WID_RX:
3270                 kiblnd_rx_complete(kiblnd_wreqid2ptr(wc->wr_id), wc->status,
3271                                    wc->byte_len);
3272                 return;
3273         }
3274 }
3275
3276 void
3277 kiblnd_cq_completion(struct ib_cq *cq, void *arg)
3278 {
3279         /* NB I'm not allowed to schedule this conn once its refcount has
3280          * reached 0.  Since fundamentally I'm racing with scheduler threads
3281          * consuming my CQ I could be called after all completions have
3282          * occurred.  But in this case, ibc_nrx == 0 && ibc_nsends_posted == 0
3283          * and this CQ is about to be destroyed so I NOOP. */
3284         kib_conn_t              *conn = (kib_conn_t *)arg;
3285         struct kib_sched_info   *sched = conn->ibc_sched;
3286         unsigned long           flags;
3287
3288         LASSERT(cq == conn->ibc_cq);
3289
3290         spin_lock_irqsave(&sched->ibs_lock, flags);
3291
3292         conn->ibc_ready = 1;
3293
3294         if (!conn->ibc_scheduled &&
3295             (conn->ibc_nrx > 0 ||
3296              conn->ibc_nsends_posted > 0)) {
3297                 kiblnd_conn_addref(conn); /* +1 ref for sched_conns */
3298                 conn->ibc_scheduled = 1;
3299                 cfs_list_add_tail(&conn->ibc_sched_list, &sched->ibs_conns);
3300
3301                 if (cfs_waitq_active(&sched->ibs_waitq))
3302                         cfs_waitq_signal(&sched->ibs_waitq);
3303         }
3304
3305         spin_unlock_irqrestore(&sched->ibs_lock, flags);
3306 }
3307
3308 void
3309 kiblnd_cq_event(struct ib_event *event, void *arg)
3310 {
3311         kib_conn_t *conn = arg;
3312
3313         CERROR("%s: async CQ event type %d\n",
3314                libcfs_nid2str(conn->ibc_peer->ibp_nid), event->event);
3315 }
3316
3317 int
3318 kiblnd_scheduler(void *arg)
3319 {
3320         long                    id = (long)arg;
3321         struct kib_sched_info   *sched;
3322         kib_conn_t              *conn;
3323         cfs_waitlink_t          wait;
3324         unsigned long           flags;
3325         struct ib_wc            wc;
3326         char                    name[20];
3327         int                     did_something;
3328         int                     busy_loops = 0;
3329         int                     rc;
3330
3331         snprintf(name, sizeof(name), "kiblnd_sd_%02ld_%02ld",
3332                  KIB_THREAD_CPT(id), KIB_THREAD_TID(id));
3333
3334         cfs_daemonize(name);
3335         cfs_block_allsigs();
3336
3337         cfs_waitlink_init(&wait);
3338
3339         sched = kiblnd_data.kib_scheds[KIB_THREAD_CPT(id)];
3340
3341         rc = cfs_cpt_bind(lnet_cpt_table(), sched->ibs_cpt);
3342         if (rc != 0) {
3343                 CWARN("Failed to bind %s on CPT %d, please verify whether "
3344                       "all CPUs are healthy and reload modules if necessary, "
3345                       "otherwise your system might under risk of low "
3346                       "performance\n", name, sched->ibs_cpt);
3347         }
3348
3349         spin_lock_irqsave(&sched->ibs_lock, flags);
3350
3351         while (!kiblnd_data.kib_shutdown) {
3352                 if (busy_loops++ >= IBLND_RESCHED) {
3353                         spin_unlock_irqrestore(&sched->ibs_lock, flags);
3354
3355                         cfs_cond_resched();
3356                         busy_loops = 0;
3357
3358                         spin_lock_irqsave(&sched->ibs_lock, flags);
3359                 }
3360
3361                 did_something = 0;
3362
3363                 if (!cfs_list_empty(&sched->ibs_conns)) {
3364                         conn = cfs_list_entry(sched->ibs_conns.next,
3365                                               kib_conn_t, ibc_sched_list);
3366                         /* take over kib_sched_conns' ref on conn... */
3367                         LASSERT(conn->ibc_scheduled);
3368                         cfs_list_del(&conn->ibc_sched_list);
3369                         conn->ibc_ready = 0;
3370
3371                         spin_unlock_irqrestore(&sched->ibs_lock, flags);
3372
3373                         rc = ib_poll_cq(conn->ibc_cq, 1, &wc);
3374                         if (rc == 0) {
3375                                 rc = ib_req_notify_cq(conn->ibc_cq,
3376                                                       IB_CQ_NEXT_COMP);
3377                                 if (rc < 0) {
3378                                         CWARN("%s: ib_req_notify_cq failed: %d, "
3379                                               "closing connection\n",
3380                                               libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
3381                                         kiblnd_close_conn(conn, -EIO);
3382                                         kiblnd_conn_decref(conn);
3383                                         spin_lock_irqsave(&sched->ibs_lock,
3384                                                               flags);
3385                                         continue;
3386                                 }
3387
3388                                 rc = ib_poll_cq(conn->ibc_cq, 1, &wc);
3389                         }
3390
3391                         if (rc < 0) {
3392                                 CWARN("%s: ib_poll_cq failed: %d, "
3393                                       "closing connection\n",
3394                                       libcfs_nid2str(conn->ibc_peer->ibp_nid),
3395                                       rc);
3396                                 kiblnd_close_conn(conn, -EIO);
3397                                 kiblnd_conn_decref(conn);
3398                                 spin_lock_irqsave(&sched->ibs_lock, flags);
3399                                 continue;
3400                         }
3401
3402                         spin_lock_irqsave(&sched->ibs_lock, flags);
3403
3404                         if (rc != 0 || conn->ibc_ready) {
3405                                 /* There may be another completion waiting; get
3406                                  * another scheduler to check while I handle
3407                                  * this one... */
3408                                 /* +1 ref for sched_conns */
3409                                 kiblnd_conn_addref(conn);
3410                                 cfs_list_add_tail(&conn->ibc_sched_list,
3411                                                   &sched->ibs_conns);
3412                                 if (cfs_waitq_active(&sched->ibs_waitq))
3413                                         cfs_waitq_signal(&sched->ibs_waitq);
3414                         } else {
3415                                 conn->ibc_scheduled = 0;
3416                         }
3417
3418                         if (rc != 0) {
3419                                 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3420                                 kiblnd_complete(&wc);
3421
3422                                 spin_lock_irqsave(&sched->ibs_lock, flags);
3423                         }
3424
3425                         kiblnd_conn_decref(conn); /* ...drop my ref from above */
3426                         did_something = 1;
3427                 }
3428
3429                 if (did_something)
3430                         continue;
3431
3432                 cfs_set_current_state(CFS_TASK_INTERRUPTIBLE);
3433                 cfs_waitq_add_exclusive(&sched->ibs_waitq, &wait);
3434                 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3435
3436                 cfs_waitq_wait(&wait, CFS_TASK_INTERRUPTIBLE);
3437                 busy_loops = 0;
3438
3439                 cfs_waitq_del(&sched->ibs_waitq, &wait);
3440                 cfs_set_current_state(CFS_TASK_RUNNING);
3441                 spin_lock_irqsave(&sched->ibs_lock, flags);
3442         }
3443
3444         spin_unlock_irqrestore(&sched->ibs_lock, flags);
3445
3446         kiblnd_thread_fini();
3447         return 0;
3448 }
3449
3450 int
3451 kiblnd_failover_thread(void *arg)
3452 {
3453         rwlock_t                *glock = &kiblnd_data.kib_global_lock;
3454         kib_dev_t         *dev;
3455         cfs_waitlink_t     wait;
3456         unsigned long      flags;
3457         int                rc;
3458
3459         LASSERT (*kiblnd_tunables.kib_dev_failover != 0);
3460
3461         cfs_daemonize ("kiblnd_failover");
3462         cfs_block_allsigs ();
3463
3464         cfs_waitlink_init(&wait);
3465         write_lock_irqsave(glock, flags);
3466
3467         while (!kiblnd_data.kib_shutdown) {
3468                 int     do_failover = 0;
3469                 int     long_sleep;
3470
3471                 cfs_list_for_each_entry(dev, &kiblnd_data.kib_failed_devs,
3472                                     ibd_fail_list) {
3473                         if (cfs_time_before(cfs_time_current(),
3474                                             dev->ibd_next_failover))
3475                                 continue;
3476                         do_failover = 1;
3477                         break;
3478                 }
3479
3480                 if (do_failover) {
3481                         cfs_list_del_init(&dev->ibd_fail_list);
3482                         dev->ibd_failover = 1;
3483                         write_unlock_irqrestore(glock, flags);
3484
3485                         rc = kiblnd_dev_failover(dev);
3486
3487                         write_lock_irqsave(glock, flags);
3488
3489                         LASSERT (dev->ibd_failover);
3490                         dev->ibd_failover = 0;
3491                         if (rc >= 0) { /* Device is OK or failover succeed */
3492                                 dev->ibd_next_failover = cfs_time_shift(3);
3493                                 continue;
3494                         }
3495
3496                         /* failed to failover, retry later */
3497                         dev->ibd_next_failover =
3498                                 cfs_time_shift(min(dev->ibd_failed_failover, 10));
3499                         if (kiblnd_dev_can_failover(dev)) {
3500                                 cfs_list_add_tail(&dev->ibd_fail_list,
3501                                               &kiblnd_data.kib_failed_devs);
3502                         }
3503
3504                         continue;
3505                 }
3506
3507                 /* long sleep if no more pending failover */
3508                 long_sleep = cfs_list_empty(&kiblnd_data.kib_failed_devs);
3509
3510                 cfs_set_current_state(CFS_TASK_INTERRUPTIBLE);
3511                 cfs_waitq_add(&kiblnd_data.kib_failover_waitq, &wait);
3512                 write_unlock_irqrestore(glock, flags);
3513
3514                 rc = schedule_timeout(long_sleep ? cfs_time_seconds(10) :
3515                                                    cfs_time_seconds(1));
3516                 cfs_set_current_state(CFS_TASK_RUNNING);
3517                 cfs_waitq_del(&kiblnd_data.kib_failover_waitq, &wait);
3518                 write_lock_irqsave(glock, flags);
3519
3520                 if (!long_sleep || rc != 0)
3521                         continue;
3522
3523                 /* have a long sleep, routine check all active devices,
3524                  * we need checking like this because if there is not active
3525                  * connection on the dev and no SEND from local, we may listen
3526                  * on wrong HCA for ever while there is a bonding failover */
3527                 cfs_list_for_each_entry(dev, &kiblnd_data.kib_devs, ibd_list) {
3528                         if (kiblnd_dev_can_failover(dev)) {
3529                                 cfs_list_add_tail(&dev->ibd_fail_list,
3530                                               &kiblnd_data.kib_failed_devs);
3531                         }
3532                 }
3533         }
3534
3535         write_unlock_irqrestore(glock, flags);
3536
3537         kiblnd_thread_fini();
3538         return 0;
3539 }