lnet/klnds/socklnd/socklnd_cb.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * Copyright  2008 Sun Microsystems, Inc. All rights reserved
   5  *
   6  *   Author: Zach Brown <zab@zabbo.net>
   7  *   Author: Peter J. Braam <braam@clusterfs.com>
   8  *   Author: Phil Schwan <phil@clusterfs.com>
   9  *   Author: Eric Barton <eric@bartonsoftware.com>
  10  *
  11  *   This file is part of Portals, http://www.sf.net/projects/sandiaportals/
  12  *
  13  *   Portals is free software; you can redistribute it and/or
  14  *   modify it under the terms of version 2 of the GNU General Public
  15  *   License as published by the Free Software Foundation.
  16  *
  17  *   Portals is distributed in the hope that it will be useful,
  18  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  *   GNU General Public License for more details.
  21  *
  22  *   You should have received a copy of the GNU General Public License
  23  *   along with Portals; if not, write to the Free Software
  24  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  25  */
  26
  27 #include "socklnd.h"
  28
  29 ksock_tx_t *
  30 ksocknal_alloc_tx(int type, int size)
  31 {
  32         ksock_tx_t *tx = NULL;
  33
  34         if (type == KSOCK_MSG_NOOP) {
  35                 LASSERT (size == KSOCK_NOOP_TX_SIZE);
  36
  37                 /* searching for a noop tx in free list */
  38                 cfs_spin_lock(&ksocknal_data.ksnd_tx_lock);
  39
  40                 if (!cfs_list_empty(&ksocknal_data.ksnd_idle_noop_txs)) {
  41                         tx = cfs_list_entry(ksocknal_data.ksnd_idle_noop_txs. \
  42                                             next, ksock_tx_t, tx_list);
  43                         LASSERT(tx->tx_desc_size == size);
  44                         cfs_list_del(&tx->tx_list);
  45                 }
  46
  47                 cfs_spin_unlock(&ksocknal_data.ksnd_tx_lock);
  48         }
  49
  50         if (tx == NULL)
  51                 LIBCFS_ALLOC(tx, size);
  52
  53         if (tx == NULL)
  54                 return NULL;
  55
  56         cfs_atomic_set(&tx->tx_refcount, 1);
  57         tx->tx_zc_capable = 0;
  58         tx->tx_zc_checked = 0;
  59         tx->tx_desc_size  = size;
  60
  61         cfs_atomic_inc(&ksocknal_data.ksnd_nactive_txs);
  62
  63         return tx;
  64 }
  65
  66 ksock_tx_t *
  67 ksocknal_alloc_tx_noop(__u64 cookie, int nonblk)
  68 {
  69         ksock_tx_t *tx;
  70
  71         tx = ksocknal_alloc_tx(KSOCK_MSG_NOOP, KSOCK_NOOP_TX_SIZE);
  72         if (tx == NULL) {
  73                 CERROR("Can't allocate noop tx desc\n");
  74                 return NULL;
  75         }
  76
  77         tx->tx_conn     = NULL;
  78         tx->tx_lnetmsg  = NULL;
  79         tx->tx_kiov     = NULL;
  80         tx->tx_nkiov    = 0;
  81         tx->tx_iov      = tx->tx_frags.virt.iov;
  82         tx->tx_niov     = 1;
  83         tx->tx_nonblk   = nonblk;
  84
  85         socklnd_init_msg(&tx->tx_msg, KSOCK_MSG_NOOP);
  86         tx->tx_msg.ksm_zc_cookies[1] = cookie;
  87
  88         return tx;
  89 }
  90
  91
  92 void
  93 ksocknal_free_tx (ksock_tx_t *tx)
  94 {
  95         cfs_atomic_dec(&ksocknal_data.ksnd_nactive_txs);
  96
  97         if (tx->tx_lnetmsg == NULL && tx->tx_desc_size == KSOCK_NOOP_TX_SIZE) {
  98                 /* it's a noop tx */
  99                 cfs_spin_lock(&ksocknal_data.ksnd_tx_lock);
 100
 101                 cfs_list_add(&tx->tx_list, &ksocknal_data.ksnd_idle_noop_txs);
 102
 103                 cfs_spin_unlock(&ksocknal_data.ksnd_tx_lock);
 104         } else {
 105                 LIBCFS_FREE(tx, tx->tx_desc_size);
 106         }
 107 }
 108
 109 int
 110 ksocknal_send_iov (ksock_conn_t *conn, ksock_tx_t *tx)
 111 {
 112         struct iovec  *iov = tx->tx_iov;
 113         int    nob;
 114         int    rc;
 115
 116         LASSERT (tx->tx_niov > 0);
 117
 118         /* Never touch tx->tx_iov inside ksocknal_lib_send_iov() */
 119         rc = ksocknal_lib_send_iov(conn, tx);
 120
 121         if (rc <= 0)                            /* sent nothing? */
 122                 return (rc);
 123
 124         nob = rc;
 125         LASSERT (nob <= tx->tx_resid);
 126         tx->tx_resid -= nob;
 127
 128         /* "consume" iov */
 129         do {
 130                 LASSERT (tx->tx_niov > 0);
 131
 132                 if (nob < (int) iov->iov_len) {
 133                         iov->iov_base = (void *)((char *)iov->iov_base + nob);
 134                         iov->iov_len -= nob;
 135                         return (rc);
 136                 }
 137
 138                 nob -= iov->iov_len;
 139                 tx->tx_iov = ++iov;
 140                 tx->tx_niov--;
 141         } while (nob != 0);
 142
 143         return (rc);
 144 }
 145
 146 int
 147 ksocknal_send_kiov (ksock_conn_t *conn, ksock_tx_t *tx)
 148 {
 149         lnet_kiov_t    *kiov = tx->tx_kiov;
 150         int     nob;
 151         int     rc;
 152
 153         LASSERT (tx->tx_niov == 0);
 154         LASSERT (tx->tx_nkiov > 0);
 155
 156         /* Never touch tx->tx_kiov inside ksocknal_lib_send_kiov() */
 157         rc = ksocknal_lib_send_kiov(conn, tx);
 158
 159         if (rc <= 0)                            /* sent nothing? */
 160                 return (rc);
 161
 162         nob = rc;
 163         LASSERT (nob <= tx->tx_resid);
 164         tx->tx_resid -= nob;
 165
 166         /* "consume" kiov */
 167         do {
 168                 LASSERT(tx->tx_nkiov > 0);
 169
 170                 if (nob < (int)kiov->kiov_len) {
 171                         kiov->kiov_offset += nob;
 172                         kiov->kiov_len -= nob;
 173                         return rc;
 174                 }
 175
 176                 nob -= (int)kiov->kiov_len;
 177                 tx->tx_kiov = ++kiov;
 178                 tx->tx_nkiov--;
 179         } while (nob != 0);
 180
 181         return (rc);
 182 }
 183
 184 int
 185 ksocknal_transmit (ksock_conn_t *conn, ksock_tx_t *tx)
 186 {
 187         int      rc;
 188         int      bufnob;
 189
 190         if (ksocknal_data.ksnd_stall_tx != 0) {
 191                 cfs_pause(cfs_time_seconds(ksocknal_data.ksnd_stall_tx));
 192         }
 193
 194         LASSERT (tx->tx_resid != 0);
 195
 196         rc = ksocknal_connsock_addref(conn);
 197         if (rc != 0) {
 198                 LASSERT (conn->ksnc_closing);
 199                 return (-ESHUTDOWN);
 200         }
 201
 202         do {
 203                 if (ksocknal_data.ksnd_enomem_tx > 0) {
 204                         /* testing... */
 205                         ksocknal_data.ksnd_enomem_tx--;
 206                         rc = -EAGAIN;
 207                 } else if (tx->tx_niov != 0) {
 208                         rc = ksocknal_send_iov (conn, tx);
 209                 } else {
 210                         rc = ksocknal_send_kiov (conn, tx);
 211                 }
 212
 213                 bufnob = libcfs_sock_wmem_queued(conn->ksnc_sock);
 214                 if (rc > 0)                     /* sent something? */
 215                         conn->ksnc_tx_bufnob += rc; /* account it */
 216
 217                 if (bufnob < conn->ksnc_tx_bufnob) {
 218                         /* allocated send buffer bytes < computed; infer
 219                          * something got ACKed */
 220                         conn->ksnc_tx_deadline =
 221                                 cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
 222                         conn->ksnc_peer->ksnp_last_alive = cfs_time_current();
 223                         conn->ksnc_tx_bufnob = bufnob;
 224                         cfs_mb();
 225                 }
 226
 227                 if (rc <= 0) { /* Didn't write anything? */
 228
 229                         if (rc == 0) /* some stacks return 0 instead of -EAGAIN */
 230                                 rc = -EAGAIN;
 231
 232                         /* Check if EAGAIN is due to memory pressure */
 233                         if(rc == -EAGAIN && ksocknal_lib_memory_pressure(conn))
 234                                 rc = -ENOMEM;
 235
 236                         break;
 237                 }
 238
 239                 /* socket's wmem_queued now includes 'rc' bytes */
 240                 cfs_atomic_sub (rc, &conn->ksnc_tx_nob);
 241                 rc = 0;
 242
 243         } while (tx->tx_resid != 0);
 244
 245         ksocknal_connsock_decref(conn);
 246         return (rc);
 247 }
 248
 249 int
 250 ksocknal_recv_iov (ksock_conn_t *conn)
 251 {
 252         struct iovec *iov = conn->ksnc_rx_iov;
 253         int     nob;
 254         int     rc;
 255
 256         LASSERT (conn->ksnc_rx_niov > 0);
 257
 258         /* Never touch conn->ksnc_rx_iov or change connection
 259          * status inside ksocknal_lib_recv_iov */
 260         rc = ksocknal_lib_recv_iov(conn);
 261
 262         if (rc <= 0)
 263                 return (rc);
 264
 265         /* received something... */
 266         nob = rc;
 267
 268         conn->ksnc_peer->ksnp_last_alive = cfs_time_current();
 269         conn->ksnc_rx_deadline =
 270                 cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
 271         cfs_mb();                       /* order with setting rx_started */
 272         conn->ksnc_rx_started = 1;
 273
 274         conn->ksnc_rx_nob_wanted -= nob;
 275         conn->ksnc_rx_nob_left -= nob;
 276
 277         do {
 278                 LASSERT (conn->ksnc_rx_niov > 0);
 279
 280                 if (nob < (int)iov->iov_len) {
 281                         iov->iov_len -= nob;
 282                         iov->iov_base = (void *)((char *)iov->iov_base + nob);
 283                         return (-EAGAIN);
 284                 }
 285
 286                 nob -= iov->iov_len;
 287                 conn->ksnc_rx_iov = ++iov;
 288                 conn->ksnc_rx_niov--;
 289         } while (nob != 0);
 290
 291         return (rc);
 292 }
 293
 294 int
 295 ksocknal_recv_kiov (ksock_conn_t *conn)
 296 {
 297         lnet_kiov_t   *kiov = conn->ksnc_rx_kiov;
 298         int     nob;
 299         int     rc;
 300         LASSERT (conn->ksnc_rx_nkiov > 0);
 301
 302         /* Never touch conn->ksnc_rx_kiov or change connection
 303          * status inside ksocknal_lib_recv_iov */
 304         rc = ksocknal_lib_recv_kiov(conn);
 305
 306         if (rc <= 0)
 307                 return (rc);
 308
 309         /* received something... */
 310         nob = rc;
 311
 312         conn->ksnc_peer->ksnp_last_alive = cfs_time_current();
 313         conn->ksnc_rx_deadline =
 314                 cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
 315         cfs_mb();                       /* order with setting rx_started */
 316         conn->ksnc_rx_started = 1;
 317
 318         conn->ksnc_rx_nob_wanted -= nob;
 319         conn->ksnc_rx_nob_left -= nob;
 320
 321         do {
 322                 LASSERT (conn->ksnc_rx_nkiov > 0);
 323
 324                 if (nob < (int) kiov->kiov_len) {
 325                         kiov->kiov_offset += nob;
 326                         kiov->kiov_len -= nob;
 327                         return -EAGAIN;
 328                 }
 329
 330                 nob -= kiov->kiov_len;
 331                 conn->ksnc_rx_kiov = ++kiov;
 332                 conn->ksnc_rx_nkiov--;
 333         } while (nob != 0);
 334
 335         return 1;
 336 }
 337
 338 int
 339 ksocknal_receive (ksock_conn_t *conn)
 340 {
 341         /* Return 1 on success, 0 on EOF, < 0 on error.
 342          * Caller checks ksnc_rx_nob_wanted to determine
 343          * progress/completion. */
 344         int     rc;
 345         ENTRY;
 346
 347         if (ksocknal_data.ksnd_stall_rx != 0) {
 348                 cfs_pause(cfs_time_seconds (ksocknal_data.ksnd_stall_rx));
 349         }
 350
 351         rc = ksocknal_connsock_addref(conn);
 352         if (rc != 0) {
 353                 LASSERT (conn->ksnc_closing);
 354                 return (-ESHUTDOWN);
 355         }
 356
 357         for (;;) {
 358                 if (conn->ksnc_rx_niov != 0)
 359                         rc = ksocknal_recv_iov (conn);
 360                 else
 361                         rc = ksocknal_recv_kiov (conn);
 362
 363                 if (rc <= 0) {
 364                         /* error/EOF or partial receive */
 365                         if (rc == -EAGAIN) {
 366                                 rc = 1;
 367                         } else if (rc == 0 && conn->ksnc_rx_started) {
 368                                 /* EOF in the middle of a message */
 369                                 rc = -EPROTO;
 370                         }
 371                         break;
 372                 }
 373
 374                 /* Completed a fragment */
 375
 376                 if (conn->ksnc_rx_nob_wanted == 0) {
 377                         rc = 1;
 378                         break;
 379                 }
 380         }
 381
 382         ksocknal_connsock_decref(conn);
 383         RETURN (rc);
 384 }
 385
 386 void
 387 ksocknal_tx_done (lnet_ni_t *ni, ksock_tx_t *tx)
 388 {
 389         lnet_msg_t  *lnetmsg = tx->tx_lnetmsg;
 390         int          rc = (tx->tx_resid == 0) ? 0 : -EIO;
 391         ENTRY;
 392
 393         LASSERT(ni != NULL || tx->tx_conn != NULL);
 394
 395         if (tx->tx_conn != NULL)
 396                 ksocknal_conn_decref(tx->tx_conn);
 397
 398         if (ni == NULL && tx->tx_conn != NULL)
 399                 ni = tx->tx_conn->ksnc_peer->ksnp_ni;
 400
 401         ksocknal_free_tx (tx);
 402         if (lnetmsg != NULL) /* KSOCK_MSG_NOOP go without lnetmsg */
 403                 lnet_finalize (ni, lnetmsg, rc);
 404
 405         EXIT;
 406 }
 407
 408 void
 409 ksocknal_txlist_done (lnet_ni_t *ni, cfs_list_t *txlist, int error)
 410 {
 411         ksock_tx_t *tx;
 412
 413         while (!cfs_list_empty (txlist)) {
 414                 tx = cfs_list_entry (txlist->next, ksock_tx_t, tx_list);
 415
 416                 if (error && tx->tx_lnetmsg != NULL) {
 417                         CDEBUG (D_NETERROR, "Deleting packet type %d len %d %s->%s\n",
 418                                 le32_to_cpu (tx->tx_lnetmsg->msg_hdr.type),
 419                                 le32_to_cpu (tx->tx_lnetmsg->msg_hdr.payload_length),
 420                                 libcfs_nid2str(le64_to_cpu(tx->tx_lnetmsg->msg_hdr.src_nid)),
 421                                 libcfs_nid2str(le64_to_cpu(tx->tx_lnetmsg->msg_hdr.dest_nid)));
 422                 } else if (error) {
 423                         CDEBUG (D_NETERROR, "Deleting noop packet\n");
 424                 }
 425
 426                 cfs_list_del (&tx->tx_list);
 427
 428                 LASSERT (cfs_atomic_read(&tx->tx_refcount) == 1);
 429                 ksocknal_tx_done (ni, tx);
 430         }
 431 }
 432
 433 static void
 434 ksocknal_check_zc_req(ksock_tx_t *tx)
 435 {
 436         ksock_conn_t   *conn = tx->tx_conn;
 437         ksock_peer_t   *peer = conn->ksnc_peer;
 438
 439         /* Set tx_msg.ksm_zc_cookies[0] to a unique non-zero cookie and add tx
 440          * to ksnp_zc_req_list if some fragment of this message should be sent
 441          * zero-copy.  Our peer will send an ACK containing this cookie when
 442          * she has received this message to tell us we can signal completion.
 443          * tx_msg.ksm_zc_cookies[0] remains non-zero while tx is on
 444          * ksnp_zc_req_list. */
 445         LASSERT (tx->tx_msg.ksm_type != KSOCK_MSG_NOOP);
 446         LASSERT (tx->tx_zc_capable);
 447
 448         tx->tx_zc_checked = 1;
 449
 450         if (conn->ksnc_proto == &ksocknal_protocol_v1x ||
 451             !conn->ksnc_zc_capable)
 452                 return;
 453
 454         /* assign cookie and queue tx to pending list, it will be released when
 455          * a matching ack is received. See ksocknal_handle_zcack() */
 456
 457         ksocknal_tx_addref(tx);
 458
 459         cfs_spin_lock(&peer->ksnp_lock);
 460
 461         /* ZC_REQ is going to be pinned to the peer */
 462         tx->tx_deadline =
 463                 cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
 464
 465         LASSERT (tx->tx_msg.ksm_zc_cookies[0] == 0);
 466
 467         tx->tx_msg.ksm_zc_cookies[0] = peer->ksnp_zc_next_cookie++;
 468
 469         if (peer->ksnp_zc_next_cookie == 0)
 470                 peer->ksnp_zc_next_cookie = SOCKNAL_KEEPALIVE_PING + 1;
 471
 472         cfs_list_add_tail(&tx->tx_zc_list, &peer->ksnp_zc_req_list);
 473
 474         cfs_spin_unlock(&peer->ksnp_lock);
 475 }
 476
 477 static void
 478 ksocknal_uncheck_zc_req(ksock_tx_t *tx)
 479 {
 480         ksock_peer_t   *peer = tx->tx_conn->ksnc_peer;
 481
 482         LASSERT (tx->tx_msg.ksm_type != KSOCK_MSG_NOOP);
 483         LASSERT (tx->tx_zc_capable);
 484
 485         tx->tx_zc_checked = 0;
 486
 487         cfs_spin_lock(&peer->ksnp_lock);
 488
 489         if (tx->tx_msg.ksm_zc_cookies[0] == 0) {
 490                 /* Not waiting for an ACK */
 491                 cfs_spin_unlock(&peer->ksnp_lock);
 492                 return;
 493         }
 494
 495         tx->tx_msg.ksm_zc_cookies[0] = 0;
 496         cfs_list_del(&tx->tx_zc_list);
 497
 498         cfs_spin_unlock(&peer->ksnp_lock);
 499
 500         ksocknal_tx_decref(tx);
 501 }
 502
 503 int
 504 ksocknal_process_transmit (ksock_conn_t *conn, ksock_tx_t *tx)
 505 {
 506         int            rc;
 507
 508         if (tx->tx_zc_capable && !tx->tx_zc_checked)
 509                 ksocknal_check_zc_req(tx);
 510
 511         rc = ksocknal_transmit (conn, tx);
 512
 513         CDEBUG (D_NET, "send(%d) %d\n", tx->tx_resid, rc);
 514
 515         if (tx->tx_resid == 0) {
 516                 /* Sent everything OK */
 517                 LASSERT (rc == 0);
 518
 519                 return (0);
 520         }
 521
 522         if (rc == -EAGAIN)
 523                 return (rc);
 524
 525         if (rc == -ENOMEM) {
 526                 static int counter;
 527
 528                 counter++;   /* exponential backoff warnings */
 529                 if ((counter & (-counter)) == counter)
 530                         CWARN("%u ENOMEM tx %p (%u allocated)\n",
 531                               counter, conn, cfs_atomic_read(&libcfs_kmemory));
 532
 533                 /* Queue on ksnd_enomem_conns for retry after a timeout */
 534                 cfs_spin_lock_bh (&ksocknal_data.ksnd_reaper_lock);
 535
 536                 /* enomem list takes over scheduler's ref... */
 537                 LASSERT (conn->ksnc_tx_scheduled);
 538                 cfs_list_add_tail(&conn->ksnc_tx_list,
 539                                   &ksocknal_data.ksnd_enomem_conns);
 540                 if (!cfs_time_aftereq(cfs_time_add(cfs_time_current(),
 541                                                    SOCKNAL_ENOMEM_RETRY),
 542                                    ksocknal_data.ksnd_reaper_waketime))
 543                         cfs_waitq_signal (&ksocknal_data.ksnd_reaper_waitq);
 544
 545                 cfs_spin_unlock_bh (&ksocknal_data.ksnd_reaper_lock);
 546                 return (rc);
 547         }
 548
 549         /* Actual error */
 550         LASSERT (rc < 0);
 551
 552         if (!conn->ksnc_closing) {
 553                 switch (rc) {
 554                 case -ECONNRESET:
 555                         LCONSOLE_WARN("Host %u.%u.%u.%u reset our connection "
 556                                       "while we were sending data; it may have "
 557                                       "rebooted.\n",
 558                                       HIPQUAD(conn->ksnc_ipaddr));
 559                         break;
 560                 default:
 561                         LCONSOLE_WARN("There was an unexpected network error "
 562                                       "while writing to %u.%u.%u.%u: %d.\n",
 563                                       HIPQUAD(conn->ksnc_ipaddr), rc);
 564                         break;
 565                 }
 566                 CDEBUG(D_NET, "[%p] Error %d on write to %s"
 567                        " ip %d.%d.%d.%d:%d\n", conn, rc,
 568                        libcfs_id2str(conn->ksnc_peer->ksnp_id),
 569                        HIPQUAD(conn->ksnc_ipaddr),
 570                        conn->ksnc_port);
 571         }
 572
 573         if (tx->tx_zc_checked)
 574                 ksocknal_uncheck_zc_req(tx);
 575
 576         /* it's not an error if conn is being closed */
 577         ksocknal_close_conn_and_siblings (conn,
 578                                           (conn->ksnc_closing) ? 0 : rc);
 579
 580         return (rc);
 581 }
 582
 583 void
 584 ksocknal_launch_connection_locked (ksock_route_t *route)
 585 {
 586
 587         /* called holding write lock on ksnd_global_lock */
 588
 589         LASSERT (!route->ksnr_scheduled);
 590         LASSERT (!route->ksnr_connecting);
 591         LASSERT ((ksocknal_route_mask() & ~route->ksnr_connected) != 0);
 592
 593         route->ksnr_scheduled = 1;              /* scheduling conn for connd */
 594         ksocknal_route_addref(route);           /* extra ref for connd */
 595
 596         cfs_spin_lock_bh (&ksocknal_data.ksnd_connd_lock);
 597
 598         cfs_list_add_tail (&route->ksnr_connd_list,
 599                            &ksocknal_data.ksnd_connd_routes);
 600         cfs_waitq_signal (&ksocknal_data.ksnd_connd_waitq);
 601
 602         cfs_spin_unlock_bh (&ksocknal_data.ksnd_connd_lock);
 603 }
 604
 605 void
 606 ksocknal_launch_all_connections_locked (ksock_peer_t *peer)
 607 {
 608         ksock_route_t *route;
 609
 610         /* called holding write lock on ksnd_global_lock */
 611         for (;;) {
 612                 /* launch any/all connections that need it */
 613                 route = ksocknal_find_connectable_route_locked(peer);
 614                 if (route == NULL)
 615                         return;
 616
 617                 ksocknal_launch_connection_locked(route);
 618         }
 619 }
 620
 621 ksock_conn_t *
 622 ksocknal_find_conn_locked(ksock_peer_t *peer, ksock_tx_t *tx, int nonblk)
 623 {
 624         cfs_list_t       *tmp;
 625         ksock_conn_t     *conn;
 626         ksock_conn_t     *typed = NULL;
 627         ksock_conn_t     *fallback = NULL;
 628         int               tnob     = 0;
 629         int               fnob     = 0;
 630
 631         cfs_list_for_each (tmp, &peer->ksnp_conns) {
 632                 ksock_conn_t *c  = cfs_list_entry(tmp, ksock_conn_t, ksnc_list);
 633                 int           nob = cfs_atomic_read(&c->ksnc_tx_nob) +
 634                                     libcfs_sock_wmem_queued(c->ksnc_sock);
 635                 int           rc;
 636
 637                 LASSERT (!c->ksnc_closing);
 638                 LASSERT (c->ksnc_proto != NULL &&
 639                          c->ksnc_proto->pro_match_tx != NULL);
 640
 641                 rc = c->ksnc_proto->pro_match_tx(c, tx, nonblk);
 642
 643                 switch (rc) {
 644                 default:
 645                         LBUG();
 646                 case SOCKNAL_MATCH_NO: /* protocol rejected the tx */
 647                         continue;
 648
 649                 case SOCKNAL_MATCH_YES: /* typed connection */
 650                         if (typed == NULL || tnob > nob ||
 651                             (tnob == nob && *ksocknal_tunables.ksnd_round_robin &&
 652                              cfs_time_after(typed->ksnc_tx_last_post, c->ksnc_tx_last_post))) {
 653                                 typed = c;
 654                                 tnob  = nob;
 655                         }
 656                         break;
 657
 658                 case SOCKNAL_MATCH_MAY: /* fallback connection */
 659                         if (fallback == NULL || fnob > nob ||
 660                             (fnob == nob && *ksocknal_tunables.ksnd_round_robin &&
 661                              cfs_time_after(fallback->ksnc_tx_last_post, c->ksnc_tx_last_post))) {
 662                                 fallback = c;
 663                                 fnob     = nob;
 664                         }
 665                         break;
 666                 }
 667         }
 668
 669         /* prefer the typed selection */
 670         conn = (typed != NULL) ? typed : fallback;
 671
 672         if (conn != NULL)
 673                 conn->ksnc_tx_last_post = cfs_time_current();
 674
 675         return conn;
 676 }
 677
 678 void
 679 ksocknal_tx_prep(ksock_conn_t *conn, ksock_tx_t *tx)
 680 {
 681         conn->ksnc_proto->pro_pack(tx);
 682
 683         cfs_atomic_add (tx->tx_nob, &conn->ksnc_tx_nob);
 684         ksocknal_conn_addref(conn); /* +1 ref for tx */
 685         tx->tx_conn = conn;
 686 }
 687
 688 void
 689 ksocknal_queue_tx_locked (ksock_tx_t *tx, ksock_conn_t *conn)
 690 {
 691         ksock_sched_t *sched = conn->ksnc_scheduler;
 692         ksock_msg_t   *msg = &tx->tx_msg;
 693         ksock_tx_t    *ztx = NULL;
 694         int            bufnob = 0;
 695
 696         /* called holding global lock (read or irq-write) and caller may
 697          * not have dropped this lock between finding conn and calling me,
 698          * so we don't need the {get,put}connsock dance to deref
 699          * ksnc_sock... */
 700         LASSERT(!conn->ksnc_closing);
 701
 702         CDEBUG (D_NET, "Sending to %s ip %d.%d.%d.%d:%d\n",
 703                 libcfs_id2str(conn->ksnc_peer->ksnp_id),
 704                 HIPQUAD(conn->ksnc_ipaddr),
 705                 conn->ksnc_port);
 706
 707         ksocknal_tx_prep(conn, tx);
 708
 709         /* Ensure the frags we've been given EXACTLY match the number of
 710          * bytes we want to send.  Many TCP/IP stacks disregard any total
 711          * size parameters passed to them and just look at the frags.
 712          *
 713          * We always expect at least 1 mapped fragment containing the
 714          * complete ksocknal message header. */
 715         LASSERT (lnet_iov_nob (tx->tx_niov, tx->tx_iov) +
 716                  lnet_kiov_nob(tx->tx_nkiov, tx->tx_kiov) ==
 717                  (unsigned int)tx->tx_nob);
 718         LASSERT (tx->tx_niov >= 1);
 719         LASSERT (tx->tx_resid == tx->tx_nob);
 720
 721         CDEBUG (D_NET, "Packet %p type %d, nob %d niov %d nkiov %d\n",
 722                 tx, (tx->tx_lnetmsg != NULL) ? tx->tx_lnetmsg->msg_hdr.type:
 723                                                KSOCK_MSG_NOOP,
 724                 tx->tx_nob, tx->tx_niov, tx->tx_nkiov);
 725
 726         /*
 727          * FIXME: SOCK_WMEM_QUEUED and SOCK_ERROR could block in __DARWIN8__
 728          * but they're used inside spinlocks a lot.
 729          */
 730         bufnob = libcfs_sock_wmem_queued(conn->ksnc_sock);
 731         cfs_spin_lock_bh (&sched->kss_lock);
 732
 733         if (cfs_list_empty(&conn->ksnc_tx_queue) && bufnob == 0) {
 734                 /* First packet starts the timeout */
 735                 conn->ksnc_tx_deadline =
 736                         cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
 737                 if (conn->ksnc_tx_bufnob > 0) /* something got ACKed */
 738                         conn->ksnc_peer->ksnp_last_alive = cfs_time_current();
 739                 conn->ksnc_tx_bufnob = 0;
 740                 cfs_mb(); /* order with adding to tx_queue */
 741         }
 742
 743         if (msg->ksm_type == KSOCK_MSG_NOOP) {
 744                 /* The packet is noop ZC ACK, try to piggyback the ack_cookie
 745                  * on a normal packet so I don't need to send it */
 746                 LASSERT (msg->ksm_zc_cookies[1] != 0);
 747                 LASSERT (conn->ksnc_proto->pro_queue_tx_zcack != NULL);
 748
 749                 if (conn->ksnc_proto->pro_queue_tx_zcack(conn, tx, 0))
 750                         ztx = tx; /* ZC ACK piggybacked on ztx release tx later */
 751
 752         } else {
 753                 /* It's a normal packet - can it piggback a noop zc-ack that
 754                  * has been queued already? */
 755                 LASSERT (msg->ksm_zc_cookies[1] == 0);
 756                 LASSERT (conn->ksnc_proto->pro_queue_tx_msg != NULL);
 757
 758                 ztx = conn->ksnc_proto->pro_queue_tx_msg(conn, tx);
 759                 /* ztx will be released later */
 760         }
 761
 762         if (ztx != NULL) {
 763                 cfs_atomic_sub (ztx->tx_nob, &conn->ksnc_tx_nob);
 764                 cfs_list_add_tail(&ztx->tx_list, &sched->kss_zombie_noop_txs);
 765         }
 766
 767         if (conn->ksnc_tx_ready &&      /* able to send */
 768             !conn->ksnc_tx_scheduled) { /* not scheduled to send */
 769                 /* +1 ref for scheduler */
 770                 ksocknal_conn_addref(conn);
 771                 cfs_list_add_tail (&conn->ksnc_tx_list,
 772                                    &sched->kss_tx_conns);
 773                 conn->ksnc_tx_scheduled = 1;
 774                 cfs_waitq_signal (&sched->kss_waitq);
 775         }
 776
 777         cfs_spin_unlock_bh (&sched->kss_lock);
 778 }
 779
 780
 781 ksock_route_t *
 782 ksocknal_find_connectable_route_locked (ksock_peer_t *peer)
 783 {
 784         cfs_list_t        *tmp;
 785         ksock_route_t     *route;
 786
 787         cfs_list_for_each (tmp, &peer->ksnp_routes) {
 788                 route = cfs_list_entry (tmp, ksock_route_t, ksnr_list);
 789
 790                 LASSERT (!route->ksnr_connecting || route->ksnr_scheduled);
 791
 792                 if (route->ksnr_scheduled)      /* connections being established */
 793                         continue;
 794
 795                 /* all route types connected ? */
 796                 if ((ksocknal_route_mask() & ~route->ksnr_connected) == 0)
 797                         continue;
 798
 799                 /* too soon to retry this guy? */
 800                 if (!(route->ksnr_retry_interval == 0 || /* first attempt */
 801                       cfs_time_aftereq (cfs_time_current(),
 802                                         route->ksnr_timeout)))
 803                         continue;
 804
 805                 return (route);
 806         }
 807
 808         return (NULL);
 809 }
 810
 811 ksock_route_t *
 812 ksocknal_find_connecting_route_locked (ksock_peer_t *peer)
 813 {
 814         cfs_list_t        *tmp;
 815         ksock_route_t     *route;
 816
 817         cfs_list_for_each (tmp, &peer->ksnp_routes) {
 818                 route = cfs_list_entry (tmp, ksock_route_t, ksnr_list);
 819
 820                 LASSERT (!route->ksnr_connecting || route->ksnr_scheduled);
 821
 822                 if (route->ksnr_scheduled)
 823                         return (route);
 824         }
 825
 826         return (NULL);
 827 }
 828
 829 int
 830 ksocknal_launch_packet (lnet_ni_t *ni, ksock_tx_t *tx, lnet_process_id_t id)
 831 {
 832         ksock_peer_t     *peer;
 833         ksock_conn_t     *conn;
 834         cfs_rwlock_t     *g_lock;
 835         int               retry;
 836         int               rc;
 837
 838         LASSERT (tx->tx_conn == NULL);
 839
 840         g_lock = &ksocknal_data.ksnd_global_lock;
 841
 842         for (retry = 0;; retry = 1) {
 843                 cfs_read_lock (g_lock);
 844                 peer = ksocknal_find_peer_locked(ni, id);
 845                 if (peer != NULL) {
 846                         if (ksocknal_find_connectable_route_locked(peer) == NULL) {
 847                                 conn = ksocknal_find_conn_locked(peer, tx, tx->tx_nonblk);
 848                                 if (conn != NULL) {
 849                                         /* I've got no routes that need to be
 850                                          * connecting and I do have an actual
 851                                          * connection... */
 852                                         ksocknal_queue_tx_locked (tx, conn);
 853                                         cfs_read_unlock (g_lock);
 854                                         return (0);
 855                                 }
 856                         }
 857                 }
 858
 859                 /* I'll need a write lock... */
 860                 cfs_read_unlock (g_lock);
 861
 862                 cfs_write_lock_bh (g_lock);
 863
 864                 peer = ksocknal_find_peer_locked(ni, id);
 865                 if (peer != NULL)
 866                         break;
 867
 868                 cfs_write_unlock_bh (g_lock);
 869
 870                 if ((id.pid & LNET_PID_USERFLAG) != 0) {
 871                         CERROR("Refusing to create a connection to "
 872                                "userspace process %s\n", libcfs_id2str(id));
 873                         return -EHOSTUNREACH;
 874                 }
 875
 876                 if (retry) {
 877                         CERROR("Can't find peer %s\n", libcfs_id2str(id));
 878                         return -EHOSTUNREACH;
 879                 }
 880
 881                 rc = ksocknal_add_peer(ni, id,
 882                                        LNET_NIDADDR(id.nid),
 883                                        lnet_acceptor_port());
 884                 if (rc != 0) {
 885                         CERROR("Can't add peer %s: %d\n",
 886                                libcfs_id2str(id), rc);
 887                         return rc;
 888                 }
 889         }
 890
 891         ksocknal_launch_all_connections_locked(peer);
 892
 893         conn = ksocknal_find_conn_locked(peer, tx, tx->tx_nonblk);
 894         if (conn != NULL) {
 895                 /* Connection exists; queue message on it */
 896                 ksocknal_queue_tx_locked (tx, conn);
 897                 cfs_write_unlock_bh (g_lock);
 898                 return (0);
 899         }
 900
 901         if (peer->ksnp_accepting > 0 ||
 902             ksocknal_find_connecting_route_locked (peer) != NULL) {
 903                 /* the message is going to be pinned to the peer */
 904                 tx->tx_deadline =
 905                         cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
 906
 907                 /* Queue the message until a connection is established */
 908                 cfs_list_add_tail (&tx->tx_list, &peer->ksnp_tx_queue);
 909                 cfs_write_unlock_bh (g_lock);
 910                 return 0;
 911         }
 912
 913         cfs_write_unlock_bh (g_lock);
 914
 915         /* NB Routes may be ignored if connections to them failed recently */
 916         CDEBUG(D_NETERROR, "No usable routes to %s\n", libcfs_id2str(id));
 917         return (-EHOSTUNREACH);
 918 }
 919
 920 int
 921 ksocknal_send(lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg)
 922 {
 923         int               type = lntmsg->msg_type;
 924         lnet_process_id_t target = lntmsg->msg_target;
 925         unsigned int      payload_niov = lntmsg->msg_niov;
 926         struct iovec     *payload_iov = lntmsg->msg_iov;
 927         lnet_kiov_t      *payload_kiov = lntmsg->msg_kiov;
 928         unsigned int      payload_offset = lntmsg->msg_offset;
 929         unsigned int      payload_nob = lntmsg->msg_len;
 930         ksock_tx_t       *tx;
 931         int               desc_size;
 932         int               rc;
 933
 934         /* NB 'private' is different depending on what we're sending.
 935          * Just ignore it... */
 936
 937         CDEBUG(D_NET, "sending %u bytes in %d frags to %s\n",
 938                payload_nob, payload_niov, libcfs_id2str(target));
 939
 940         LASSERT (payload_nob == 0 || payload_niov > 0);
 941         LASSERT (payload_niov <= LNET_MAX_IOV);
 942         /* payload is either all vaddrs or all pages */
 943         LASSERT (!(payload_kiov != NULL && payload_iov != NULL));
 944         LASSERT (!cfs_in_interrupt ());
 945
 946         if (payload_iov != NULL)
 947                 desc_size = offsetof(ksock_tx_t,
 948                                      tx_frags.virt.iov[1 + payload_niov]);
 949         else
 950                 desc_size = offsetof(ksock_tx_t,
 951                                      tx_frags.paged.kiov[payload_niov]);
 952
 953         tx = ksocknal_alloc_tx(KSOCK_MSG_LNET, desc_size);
 954         if (tx == NULL) {
 955                 CERROR("Can't allocate tx desc type %d size %d\n",
 956                        type, desc_size);
 957                 return (-ENOMEM);
 958         }
 959
 960         tx->tx_conn = NULL;                     /* set when assigned a conn */
 961         tx->tx_lnetmsg = lntmsg;
 962
 963         if (payload_iov != NULL) {
 964                 tx->tx_kiov = NULL;
 965                 tx->tx_nkiov = 0;
 966                 tx->tx_iov = tx->tx_frags.virt.iov;
 967                 tx->tx_niov = 1 +
 968                               lnet_extract_iov(payload_niov, &tx->tx_iov[1],
 969                                                payload_niov, payload_iov,
 970                                                payload_offset, payload_nob);
 971         } else {
 972                 tx->tx_niov = 1;
 973                 tx->tx_iov = &tx->tx_frags.paged.iov;
 974                 tx->tx_kiov = tx->tx_frags.paged.kiov;
 975                 tx->tx_nkiov = lnet_extract_kiov(payload_niov, tx->tx_kiov,
 976                                                  payload_niov, payload_kiov,
 977                                                  payload_offset, payload_nob);
 978
 979                 if (payload_nob >= *ksocknal_tunables.ksnd_zc_min_payload)
 980                         tx->tx_zc_capable = 1;
 981         }
 982
 983         socklnd_init_msg(&tx->tx_msg, KSOCK_MSG_LNET);
 984
 985         /* The first fragment will be set later in pro_pack */
 986         rc = ksocknal_launch_packet(ni, tx, target);
 987         if (rc == 0)
 988                 return (0);
 989
 990         ksocknal_free_tx(tx);
 991         return (-EIO);
 992 }
 993
 994 int
 995 ksocknal_thread_start (int (*fn)(void *arg), void *arg)
 996 {
 997         long          pid = cfs_kernel_thread (fn, arg, 0);
 998
 999         if (pid < 0)
1000                 return ((int)pid);
1001
1002         cfs_write_lock_bh (&ksocknal_data.ksnd_global_lock);
1003         ksocknal_data.ksnd_nthreads++;
1004         cfs_write_unlock_bh (&ksocknal_data.ksnd_global_lock);
1005         return (0);
1006 }
1007
1008 void
1009 ksocknal_thread_fini (void)
1010 {
1011         cfs_write_lock_bh (&ksocknal_data.ksnd_global_lock);
1012         ksocknal_data.ksnd_nthreads--;
1013         cfs_write_unlock_bh (&ksocknal_data.ksnd_global_lock);
1014 }
1015
1016 int
1017 ksocknal_new_packet (ksock_conn_t *conn, int nob_to_skip)
1018 {
1019         static char ksocknal_slop_buffer[4096];
1020
1021         int            nob;
1022         unsigned int   niov;
1023         int            skipped;
1024
1025         LASSERT(conn->ksnc_proto != NULL);
1026
1027         if ((*ksocknal_tunables.ksnd_eager_ack & conn->ksnc_type) != 0) {
1028                 /* Remind the socket to ack eagerly... */
1029                 ksocknal_lib_eager_ack(conn);
1030         }
1031
1032         if (nob_to_skip == 0) {         /* right at next packet boundary now */
1033                 conn->ksnc_rx_started = 0;
1034                 cfs_mb();                       /* racing with timeout thread */
1035
1036                 switch (conn->ksnc_proto->pro_version) {
1037                 case  KSOCK_PROTO_V2:
1038                 case  KSOCK_PROTO_V3:
1039                         conn->ksnc_rx_state = SOCKNAL_RX_KSM_HEADER;
1040                         conn->ksnc_rx_iov = (struct iovec *)&conn->ksnc_rx_iov_space;
1041                         conn->ksnc_rx_iov[0].iov_base = (char *)&conn->ksnc_msg;
1042
1043                         conn->ksnc_rx_nob_wanted = offsetof(ksock_msg_t, ksm_u);
1044                         conn->ksnc_rx_nob_left = offsetof(ksock_msg_t, ksm_u);
1045                         conn->ksnc_rx_iov[0].iov_len  = offsetof(ksock_msg_t, ksm_u);
1046                         break;
1047
1048                 case KSOCK_PROTO_V1:
1049                         /* Receiving bare lnet_hdr_t */
1050                         conn->ksnc_rx_state = SOCKNAL_RX_LNET_HEADER;
1051                         conn->ksnc_rx_nob_wanted = sizeof(lnet_hdr_t);
1052                         conn->ksnc_rx_nob_left = sizeof(lnet_hdr_t);
1053
1054                         conn->ksnc_rx_iov = (struct iovec *)&conn->ksnc_rx_iov_space;
1055                         conn->ksnc_rx_iov[0].iov_base = (char *)&conn->ksnc_msg.ksm_u.lnetmsg;
1056                         conn->ksnc_rx_iov[0].iov_len  = sizeof (lnet_hdr_t);
1057                         break;
1058
1059                 default:
1060                         LBUG ();
1061                 }
1062                 conn->ksnc_rx_niov = 1;
1063
1064                 conn->ksnc_rx_kiov = NULL;
1065                 conn->ksnc_rx_nkiov = 0;
1066                 conn->ksnc_rx_csum = ~0;
1067                 return (1);
1068         }
1069
1070         /* Set up to skip as much as possible now.  If there's more left
1071          * (ran out of iov entries) we'll get called again */
1072
1073         conn->ksnc_rx_state = SOCKNAL_RX_SLOP;
1074         conn->ksnc_rx_nob_left = nob_to_skip;
1075         conn->ksnc_rx_iov = (struct iovec *)&conn->ksnc_rx_iov_space;
1076         skipped = 0;
1077         niov = 0;
1078
1079         do {
1080                 nob = MIN (nob_to_skip, sizeof (ksocknal_slop_buffer));
1081
1082                 conn->ksnc_rx_iov[niov].iov_base = ksocknal_slop_buffer;
1083                 conn->ksnc_rx_iov[niov].iov_len  = nob;
1084                 niov++;
1085                 skipped += nob;
1086                 nob_to_skip -=nob;
1087
1088         } while (nob_to_skip != 0 &&    /* mustn't overflow conn's rx iov */
1089                  niov < sizeof(conn->ksnc_rx_iov_space) / sizeof (struct iovec));
1090
1091         conn->ksnc_rx_niov = niov;
1092         conn->ksnc_rx_kiov = NULL;
1093         conn->ksnc_rx_nkiov = 0;
1094         conn->ksnc_rx_nob_wanted = skipped;
1095         return (0);
1096 }
1097
1098 int
1099 ksocknal_process_receive (ksock_conn_t *conn)
1100 {
1101         lnet_hdr_t        *lhdr;
1102         lnet_process_id_t *id;
1103         int                rc;
1104
1105         LASSERT (cfs_atomic_read(&conn->ksnc_conn_refcount) > 0);
1106
1107         /* NB: sched lock NOT held */
1108         /* SOCKNAL_RX_LNET_HEADER is here for backward compatability */
1109         LASSERT (conn->ksnc_rx_state == SOCKNAL_RX_KSM_HEADER ||
1110                  conn->ksnc_rx_state == SOCKNAL_RX_LNET_PAYLOAD ||
1111                  conn->ksnc_rx_state == SOCKNAL_RX_LNET_HEADER ||
1112                  conn->ksnc_rx_state == SOCKNAL_RX_SLOP);
1113  again:
1114         if (conn->ksnc_rx_nob_wanted != 0) {
1115                 rc = ksocknal_receive(conn);
1116
1117                 if (rc <= 0) {
1118                         LASSERT (rc != -EAGAIN);
1119
1120                         if (rc == 0)
1121                                 CDEBUG (D_NET, "[%p] EOF from %s"
1122                                         " ip %d.%d.%d.%d:%d\n", conn,
1123                                         libcfs_id2str(conn->ksnc_peer->ksnp_id),
1124                                         HIPQUAD(conn->ksnc_ipaddr),
1125                                         conn->ksnc_port);
1126                         else if (!conn->ksnc_closing)
1127                                 CERROR ("[%p] Error %d on read from %s"
1128                                         " ip %d.%d.%d.%d:%d\n",
1129                                         conn, rc,
1130                                         libcfs_id2str(conn->ksnc_peer->ksnp_id),
1131                                         HIPQUAD(conn->ksnc_ipaddr),
1132                                         conn->ksnc_port);
1133
1134                         /* it's not an error if conn is being closed */
1135                         ksocknal_close_conn_and_siblings (conn,
1136                                                           (conn->ksnc_closing) ? 0 : rc);
1137                         return (rc == 0 ? -ESHUTDOWN : rc);
1138                 }
1139
1140                 if (conn->ksnc_rx_nob_wanted != 0) {
1141                         /* short read */
1142                         return (-EAGAIN);
1143                 }
1144         }
1145         switch (conn->ksnc_rx_state) {
1146         case SOCKNAL_RX_KSM_HEADER:
1147                 if (conn->ksnc_flip) {
1148                         __swab32s(&conn->ksnc_msg.ksm_type);
1149                         __swab32s(&conn->ksnc_msg.ksm_csum);
1150                         __swab64s(&conn->ksnc_msg.ksm_zc_cookies[0]);
1151                         __swab64s(&conn->ksnc_msg.ksm_zc_cookies[1]);
1152                 }
1153
1154                 if (conn->ksnc_msg.ksm_type != KSOCK_MSG_NOOP &&
1155                     conn->ksnc_msg.ksm_type != KSOCK_MSG_LNET) {
1156                         CERROR("%s: Unknown message type: %x\n",
1157                                libcfs_id2str(conn->ksnc_peer->ksnp_id),
1158                                conn->ksnc_msg.ksm_type);
1159                         ksocknal_new_packet(conn, 0);
1160                         ksocknal_close_conn_and_siblings(conn, -EPROTO);
1161                         return (-EPROTO);
1162                 }
1163
1164                 if (conn->ksnc_msg.ksm_type == KSOCK_MSG_NOOP &&
1165                     conn->ksnc_msg.ksm_csum != 0 &&     /* has checksum */
1166                     conn->ksnc_msg.ksm_csum != conn->ksnc_rx_csum) {
1167                         /* NOOP Checksum error */
1168                         CERROR("%s: Checksum error, wire:0x%08X data:0x%08X\n",
1169                                libcfs_id2str(conn->ksnc_peer->ksnp_id),
1170                                conn->ksnc_msg.ksm_csum, conn->ksnc_rx_csum);
1171                         ksocknal_new_packet(conn, 0);
1172                         ksocknal_close_conn_and_siblings(conn, -EPROTO);
1173                         return (-EIO);
1174                 }
1175
1176                 if (conn->ksnc_msg.ksm_zc_cookies[1] != 0) {
1177                         __u64 cookie = 0;
1178
1179                         LASSERT (conn->ksnc_proto != &ksocknal_protocol_v1x);
1180
1181                         if (conn->ksnc_msg.ksm_type == KSOCK_MSG_NOOP)
1182                                 cookie = conn->ksnc_msg.ksm_zc_cookies[0];
1183
1184                         rc = conn->ksnc_proto->pro_handle_zcack(conn, cookie,
1185                                                conn->ksnc_msg.ksm_zc_cookies[1]);
1186
1187                         if (rc != 0) {
1188                                 CERROR("%s: Unknown ZC-ACK cookie: "LPU64", "LPU64"\n",
1189                                        libcfs_id2str(conn->ksnc_peer->ksnp_id),
1190                                        cookie, conn->ksnc_msg.ksm_zc_cookies[1]);
1191                                 ksocknal_new_packet(conn, 0);
1192                                 ksocknal_close_conn_and_siblings(conn, -EPROTO);
1193                                 return (rc);
1194                         }
1195                 }
1196
1197                 if (conn->ksnc_msg.ksm_type == KSOCK_MSG_NOOP) {
1198                         ksocknal_new_packet (conn, 0);
1199                         return 0;       /* NOOP is done and just return */
1200                 }
1201
1202                 conn->ksnc_rx_state = SOCKNAL_RX_LNET_HEADER;
1203                 conn->ksnc_rx_nob_wanted = sizeof(ksock_lnet_msg_t);
1204                 conn->ksnc_rx_nob_left = sizeof(ksock_lnet_msg_t);
1205
1206                 conn->ksnc_rx_iov = (struct iovec *)&conn->ksnc_rx_iov_space;
1207                 conn->ksnc_rx_iov[0].iov_base = (char *)&conn->ksnc_msg.ksm_u.lnetmsg;
1208                 conn->ksnc_rx_iov[0].iov_len  = sizeof(ksock_lnet_msg_t);
1209
1210                 conn->ksnc_rx_niov = 1;
1211                 conn->ksnc_rx_kiov = NULL;
1212                 conn->ksnc_rx_nkiov = 0;
1213
1214                 goto again;     /* read lnet header now */
1215
1216         case SOCKNAL_RX_LNET_HEADER:
1217                 /* unpack message header */
1218                 conn->ksnc_proto->pro_unpack(&conn->ksnc_msg);
1219
1220                 if ((conn->ksnc_peer->ksnp_id.pid & LNET_PID_USERFLAG) != 0) {
1221                         /* Userspace peer */
1222                         lhdr = &conn->ksnc_msg.ksm_u.lnetmsg.ksnm_hdr;
1223                         id   = &conn->ksnc_peer->ksnp_id;
1224
1225                         /* Substitute process ID assigned at connection time */
1226                         lhdr->src_pid = cpu_to_le32(id->pid);
1227                         lhdr->src_nid = cpu_to_le64(id->nid);
1228                 }
1229
1230                 conn->ksnc_rx_state = SOCKNAL_RX_PARSE;
1231                 ksocknal_conn_addref(conn);     /* ++ref while parsing */
1232
1233                 rc = lnet_parse(conn->ksnc_peer->ksnp_ni,
1234                                 &conn->ksnc_msg.ksm_u.lnetmsg.ksnm_hdr,
1235                                 conn->ksnc_peer->ksnp_id.nid, conn, 0);
1236                 if (rc < 0) {
1237                         /* I just received garbage: give up on this conn */
1238                         ksocknal_new_packet(conn, 0);
1239                         ksocknal_close_conn_and_siblings (conn, rc);
1240                         ksocknal_conn_decref(conn);
1241                         return (-EPROTO);
1242                 }
1243
1244                 /* I'm racing with ksocknal_recv() */
1245                 LASSERT (conn->ksnc_rx_state == SOCKNAL_RX_PARSE ||
1246                          conn->ksnc_rx_state == SOCKNAL_RX_LNET_PAYLOAD);
1247
1248                 if (conn->ksnc_rx_state != SOCKNAL_RX_LNET_PAYLOAD)
1249                         return 0;
1250
1251                 /* ksocknal_recv() got called */
1252                 goto again;
1253
1254         case SOCKNAL_RX_LNET_PAYLOAD:
1255                 /* payload all received */
1256                 rc = 0;
1257
1258                 if (conn->ksnc_rx_nob_left == 0 &&   /* not truncating */
1259                     conn->ksnc_msg.ksm_csum != 0 &&  /* has checksum */
1260                     conn->ksnc_msg.ksm_csum != conn->ksnc_rx_csum) {
1261                         CERROR("%s: Checksum error, wire:0x%08X data:0x%08X\n",
1262                                libcfs_id2str(conn->ksnc_peer->ksnp_id),
1263                                conn->ksnc_msg.ksm_csum, conn->ksnc_rx_csum);
1264                         rc = -EIO;
1265                 }
1266
1267                 if (rc == 0 && conn->ksnc_msg.ksm_zc_cookies[0] != 0) {
1268                         LASSERT(conn->ksnc_proto != &ksocknal_protocol_v1x);
1269
1270                         lhdr = &conn->ksnc_msg.ksm_u.lnetmsg.ksnm_hdr;
1271                         id   = &conn->ksnc_peer->ksnp_id;
1272
1273                         rc = conn->ksnc_proto->pro_handle_zcreq(conn,
1274                                                conn->ksnc_msg.ksm_zc_cookies[0],
1275                                                le64_to_cpu(lhdr->src_nid) != id->nid);
1276                 }
1277
1278                 lnet_finalize(conn->ksnc_peer->ksnp_ni, conn->ksnc_cookie, rc);
1279
1280                 if (rc != 0) {
1281                         ksocknal_new_packet(conn, 0);
1282                         ksocknal_close_conn_and_siblings (conn, rc);
1283                         return (-EPROTO);
1284                 }
1285                 /* Fall through */
1286
1287         case SOCKNAL_RX_SLOP:
1288                 /* starting new packet? */
1289                 if (ksocknal_new_packet (conn, conn->ksnc_rx_nob_left))
1290                         return 0;       /* come back later */
1291                 goto again;             /* try to finish reading slop now */
1292
1293         default:
1294                 break;
1295         }
1296
1297         /* Not Reached */
1298         LBUG ();
1299         return (-EINVAL);                       /* keep gcc happy */
1300 }
1301
1302 int
1303 ksocknal_recv (lnet_ni_t *ni, void *private, lnet_msg_t *msg, int delayed,
1304                unsigned int niov, struct iovec *iov, lnet_kiov_t *kiov,
1305                unsigned int offset, unsigned int mlen, unsigned int rlen)
1306 {
1307         ksock_conn_t  *conn = (ksock_conn_t *)private;
1308         ksock_sched_t *sched = conn->ksnc_scheduler;
1309
1310         LASSERT (mlen <= rlen);
1311         LASSERT (niov <= LNET_MAX_IOV);
1312
1313         conn->ksnc_cookie = msg;
1314         conn->ksnc_rx_nob_wanted = mlen;
1315         conn->ksnc_rx_nob_left   = rlen;
1316
1317         if (mlen == 0 || iov != NULL) {
1318                 conn->ksnc_rx_nkiov = 0;
1319                 conn->ksnc_rx_kiov = NULL;
1320                 conn->ksnc_rx_iov = conn->ksnc_rx_iov_space.iov;
1321                 conn->ksnc_rx_niov =
1322                         lnet_extract_iov(LNET_MAX_IOV, conn->ksnc_rx_iov,
1323                                          niov, iov, offset, mlen);
1324         } else {
1325                 conn->ksnc_rx_niov = 0;
1326                 conn->ksnc_rx_iov  = NULL;
1327                 conn->ksnc_rx_kiov = conn->ksnc_rx_iov_space.kiov;
1328                 conn->ksnc_rx_nkiov =
1329                         lnet_extract_kiov(LNET_MAX_IOV, conn->ksnc_rx_kiov,
1330                                           niov, kiov, offset, mlen);
1331         }
1332
1333         LASSERT (mlen ==
1334                  lnet_iov_nob (conn->ksnc_rx_niov, conn->ksnc_rx_iov) +
1335                  lnet_kiov_nob (conn->ksnc_rx_nkiov, conn->ksnc_rx_kiov));
1336
1337         LASSERT (conn->ksnc_rx_scheduled);
1338
1339         cfs_spin_lock_bh (&sched->kss_lock);
1340
1341         switch (conn->ksnc_rx_state) {
1342         case SOCKNAL_RX_PARSE_WAIT:
1343                 cfs_list_add_tail(&conn->ksnc_rx_list, &sched->kss_rx_conns);
1344                 cfs_waitq_signal (&sched->kss_waitq);
1345                 LASSERT (conn->ksnc_rx_ready);
1346                 break;
1347
1348         case SOCKNAL_RX_PARSE:
1349                 /* scheduler hasn't noticed I'm parsing yet */
1350                 break;
1351         }
1352
1353         conn->ksnc_rx_state = SOCKNAL_RX_LNET_PAYLOAD;
1354
1355         cfs_spin_unlock_bh (&sched->kss_lock);
1356         ksocknal_conn_decref(conn);
1357         return (0);
1358 }
1359
1360 static inline int
1361 ksocknal_sched_cansleep(ksock_sched_t *sched)
1362 {
1363         int           rc;
1364
1365         cfs_spin_lock_bh (&sched->kss_lock);
1366
1367         rc = (!ksocknal_data.ksnd_shuttingdown &&
1368               cfs_list_empty(&sched->kss_rx_conns) &&
1369               cfs_list_empty(&sched->kss_tx_conns));
1370
1371         cfs_spin_unlock_bh (&sched->kss_lock);
1372         return (rc);
1373 }
1374
1375 int ksocknal_scheduler (void *arg)
1376 {
1377         ksock_sched_t     *sched = (ksock_sched_t *)arg;
1378         ksock_conn_t      *conn;
1379         ksock_tx_t        *tx;
1380         int                rc;
1381         int                nloops = 0;
1382         int                id = (int)(sched - ksocknal_data.ksnd_schedulers);
1383         char               name[16];
1384
1385         snprintf (name, sizeof (name),"socknal_sd%02d", id);
1386         cfs_daemonize (name);
1387         cfs_block_allsigs ();
1388
1389         if (ksocknal_lib_bind_thread_to_cpu(id))
1390                 CERROR ("Can't set CPU affinity for %s to %d\n", name, id);
1391
1392         cfs_spin_lock_bh (&sched->kss_lock);
1393
1394         while (!ksocknal_data.ksnd_shuttingdown) {
1395                 int did_something = 0;
1396
1397                 /* Ensure I progress everything semi-fairly */
1398
1399                 if (!cfs_list_empty (&sched->kss_rx_conns)) {
1400                         conn = cfs_list_entry(sched->kss_rx_conns.next,
1401                                               ksock_conn_t, ksnc_rx_list);
1402                         cfs_list_del(&conn->ksnc_rx_list);
1403
1404                         LASSERT(conn->ksnc_rx_scheduled);
1405                         LASSERT(conn->ksnc_rx_ready);
1406
1407                         /* clear rx_ready in case receive isn't complete.
1408                          * Do it BEFORE we call process_recv, since
1409                          * data_ready can set it any time after we release
1410                          * kss_lock. */
1411                         conn->ksnc_rx_ready = 0;
1412                         cfs_spin_unlock_bh (&sched->kss_lock);
1413
1414                         rc = ksocknal_process_receive(conn);
1415
1416                         cfs_spin_lock_bh (&sched->kss_lock);
1417
1418                         /* I'm the only one that can clear this flag */
1419                         LASSERT(conn->ksnc_rx_scheduled);
1420
1421                         /* Did process_receive get everything it wanted? */
1422                         if (rc == 0)
1423                                 conn->ksnc_rx_ready = 1;
1424
1425                         if (conn->ksnc_rx_state == SOCKNAL_RX_PARSE) {
1426                                 /* Conn blocked waiting for ksocknal_recv()
1427                                  * I change its state (under lock) to signal
1428                                  * it can be rescheduled */
1429                                 conn->ksnc_rx_state = SOCKNAL_RX_PARSE_WAIT;
1430                         } else if (conn->ksnc_rx_ready) {
1431                                 /* reschedule for rx */
1432                                 cfs_list_add_tail (&conn->ksnc_rx_list,
1433                                                    &sched->kss_rx_conns);
1434                         } else {
1435                                 conn->ksnc_rx_scheduled = 0;
1436                                 /* drop my ref */
1437                                 ksocknal_conn_decref(conn);
1438                         }
1439
1440                         did_something = 1;
1441                 }
1442
1443                 if (!cfs_list_empty (&sched->kss_tx_conns)) {
1444                         CFS_LIST_HEAD    (zlist);
1445
1446                         if (!cfs_list_empty(&sched->kss_zombie_noop_txs)) {
1447                                 cfs_list_add(&zlist,
1448                                              &sched->kss_zombie_noop_txs);
1449                                 cfs_list_del_init(&sched->kss_zombie_noop_txs);
1450                         }
1451
1452                         conn = cfs_list_entry(sched->kss_tx_conns.next,
1453                                               ksock_conn_t, ksnc_tx_list);
1454                         cfs_list_del (&conn->ksnc_tx_list);
1455
1456                         LASSERT(conn->ksnc_tx_scheduled);
1457                         LASSERT(conn->ksnc_tx_ready);
1458                         LASSERT(!cfs_list_empty(&conn->ksnc_tx_queue));
1459
1460                         tx = cfs_list_entry(conn->ksnc_tx_queue.next,
1461                                             ksock_tx_t, tx_list);
1462
1463                         if (conn->ksnc_tx_carrier == tx)
1464                                 ksocknal_next_tx_carrier(conn);
1465
1466                         /* dequeue now so empty list => more to send */
1467                         cfs_list_del(&tx->tx_list);
1468
1469                         /* Clear tx_ready in case send isn't complete.  Do
1470                          * it BEFORE we call process_transmit, since
1471                          * write_space can set it any time after we release
1472                          * kss_lock. */
1473                         conn->ksnc_tx_ready = 0;
1474                         cfs_spin_unlock_bh (&sched->kss_lock);
1475
1476                         if (!cfs_list_empty(&zlist)) {
1477                                 /* free zombie noop txs, it's fast because
1478                                  * noop txs are just put in freelist */
1479                                 ksocknal_txlist_done(NULL, &zlist, 0);
1480                         }
1481
1482                         rc = ksocknal_process_transmit(conn, tx);
1483
1484                         if (rc == -ENOMEM || rc == -EAGAIN) {
1485                                 /* Incomplete send: replace tx on HEAD of tx_queue */
1486                                 cfs_spin_lock_bh (&sched->kss_lock);
1487                                 cfs_list_add (&tx->tx_list,
1488                                               &conn->ksnc_tx_queue);
1489                         } else {
1490                                 /* Complete send; tx -ref */
1491                                 ksocknal_tx_decref (tx);
1492
1493                                 cfs_spin_lock_bh (&sched->kss_lock);
1494                                 /* assume space for more */
1495                                 conn->ksnc_tx_ready = 1;
1496                         }
1497
1498                         if (rc == -ENOMEM) {
1499                                 /* Do nothing; after a short timeout, this
1500                                  * conn will be reposted on kss_tx_conns. */
1501                         } else if (conn->ksnc_tx_ready &&
1502                                    !cfs_list_empty (&conn->ksnc_tx_queue)) {
1503                                 /* reschedule for tx */
1504                                 cfs_list_add_tail (&conn->ksnc_tx_list,
1505                                                    &sched->kss_tx_conns);
1506                         } else {
1507                                 conn->ksnc_tx_scheduled = 0;
1508                                 /* drop my ref */
1509                                 ksocknal_conn_decref(conn);
1510                         }
1511
1512                         did_something = 1;
1513                 }
1514                 if (!did_something ||           /* nothing to do */
1515                     ++nloops == SOCKNAL_RESCHED) { /* hogging CPU? */
1516                         cfs_spin_unlock_bh (&sched->kss_lock);
1517
1518                         nloops = 0;
1519
1520                         if (!did_something) {   /* wait for something to do */
1521                                 cfs_wait_event_interruptible_exclusive(
1522                                         sched->kss_waitq,
1523                                         !ksocknal_sched_cansleep(sched), rc);
1524                                 LASSERT (rc == 0);
1525                         } else {
1526                                 cfs_cond_resched();
1527                         }
1528
1529                         cfs_spin_lock_bh (&sched->kss_lock);
1530                 }
1531         }
1532
1533         cfs_spin_unlock_bh (&sched->kss_lock);
1534         ksocknal_thread_fini ();
1535         return (0);
1536 }
1537
1538 /*
1539  * Add connection to kss_rx_conns of scheduler
1540  * and wakeup the scheduler.
1541  */
1542 void ksocknal_read_callback (ksock_conn_t *conn)
1543 {
1544         ksock_sched_t *sched;
1545         ENTRY;
1546
1547         sched = conn->ksnc_scheduler;
1548
1549         cfs_spin_lock_bh (&sched->kss_lock);
1550
1551         conn->ksnc_rx_ready = 1;
1552
1553         if (!conn->ksnc_rx_scheduled) {  /* not being progressed */
1554                 cfs_list_add_tail(&conn->ksnc_rx_list,
1555                                   &sched->kss_rx_conns);
1556                 conn->ksnc_rx_scheduled = 1;
1557                 /* extra ref for scheduler */
1558                 ksocknal_conn_addref(conn);
1559
1560                 cfs_waitq_signal (&sched->kss_waitq);
1561         }
1562         cfs_spin_unlock_bh (&sched->kss_lock);
1563
1564         EXIT;
1565 }
1566
1567 /*
1568  * Add connection to kss_tx_conns of scheduler
1569  * and wakeup the scheduler.
1570  */
1571 void ksocknal_write_callback (ksock_conn_t *conn)
1572 {
1573         ksock_sched_t *sched;
1574         ENTRY;
1575
1576         sched = conn->ksnc_scheduler;
1577
1578         cfs_spin_lock_bh (&sched->kss_lock);
1579
1580         conn->ksnc_tx_ready = 1;
1581
1582         if (!conn->ksnc_tx_scheduled && // not being progressed
1583             !cfs_list_empty(&conn->ksnc_tx_queue)){//packets to send
1584                 cfs_list_add_tail (&conn->ksnc_tx_list,
1585                                    &sched->kss_tx_conns);
1586                 conn->ksnc_tx_scheduled = 1;
1587                 /* extra ref for scheduler */
1588                 ksocknal_conn_addref(conn);
1589
1590                 cfs_waitq_signal (&sched->kss_waitq);
1591         }
1592
1593         cfs_spin_unlock_bh (&sched->kss_lock);
1594
1595         EXIT;
1596 }
1597
1598 ksock_proto_t *
1599 ksocknal_parse_proto_version (ksock_hello_msg_t *hello)
1600 {
1601         __u32   version = 0;
1602
1603         if (hello->kshm_magic == LNET_PROTO_MAGIC)
1604                 version = hello->kshm_version;
1605         else if (hello->kshm_magic == __swab32(LNET_PROTO_MAGIC))
1606                 version = __swab32(hello->kshm_version);
1607
1608         if (version != 0) {
1609 #if SOCKNAL_VERSION_DEBUG
1610                 if (*ksocknal_tunables.ksnd_protocol == 1)
1611                         return NULL;
1612
1613                 if (*ksocknal_tunables.ksnd_protocol == 2 &&
1614                     version == KSOCK_PROTO_V3)
1615                         return NULL;
1616 #endif
1617                 if (version == KSOCK_PROTO_V2)
1618                         return &ksocknal_protocol_v2x;
1619
1620                 if (version == KSOCK_PROTO_V3)
1621                         return &ksocknal_protocol_v3x;
1622
1623                 return NULL;
1624         }
1625
1626         if (hello->kshm_magic == le32_to_cpu(LNET_PROTO_TCP_MAGIC)) {
1627                 lnet_magicversion_t *hmv = (lnet_magicversion_t *)hello;
1628
1629                 CLASSERT (sizeof (lnet_magicversion_t) ==
1630                           offsetof (ksock_hello_msg_t, kshm_src_nid));
1631
1632                 if (hmv->version_major == cpu_to_le16 (KSOCK_PROTO_V1_MAJOR) &&
1633                     hmv->version_minor == cpu_to_le16 (KSOCK_PROTO_V1_MINOR))
1634                         return &ksocknal_protocol_v1x;
1635         }
1636
1637         return NULL;
1638 }
1639
1640 int
1641 ksocknal_send_hello (lnet_ni_t *ni, ksock_conn_t *conn,
1642                      lnet_nid_t peer_nid, ksock_hello_msg_t *hello)
1643 {
1644         /* CAVEAT EMPTOR: this byte flips 'ipaddrs' */
1645         ksock_net_t         *net = (ksock_net_t *)ni->ni_data;
1646
1647         LASSERT (hello->kshm_nips <= LNET_MAX_INTERFACES);
1648
1649         /* rely on caller to hold a ref on socket so it wouldn't disappear */
1650         LASSERT (conn->ksnc_proto != NULL);
1651
1652         hello->kshm_src_nid         = ni->ni_nid;
1653         hello->kshm_dst_nid         = peer_nid;
1654         hello->kshm_src_pid         = the_lnet.ln_pid;
1655
1656         hello->kshm_src_incarnation = net->ksnn_incarnation;
1657         hello->kshm_ctype           = conn->ksnc_type;
1658
1659         return conn->ksnc_proto->pro_send_hello(conn, hello);
1660 }
1661
1662 int
1663 ksocknal_invert_type(int type)
1664 {
1665         switch (type)
1666         {
1667         case SOCKLND_CONN_ANY:
1668         case SOCKLND_CONN_CONTROL:
1669                 return (type);
1670         case SOCKLND_CONN_BULK_IN:
1671                 return SOCKLND_CONN_BULK_OUT;
1672         case SOCKLND_CONN_BULK_OUT:
1673                 return SOCKLND_CONN_BULK_IN;
1674         default:
1675                 return (SOCKLND_CONN_NONE);
1676         }
1677 }
1678
1679 int
1680 ksocknal_recv_hello (lnet_ni_t *ni, ksock_conn_t *conn,
1681                      ksock_hello_msg_t *hello, lnet_process_id_t *peerid,
1682                      __u64 *incarnation)
1683 {
1684         /* Return < 0        fatal error
1685          *        0          success
1686          *        EALREADY   lost connection race
1687          *        EPROTO     protocol version mismatch
1688          */
1689         cfs_socket_t        *sock = conn->ksnc_sock;
1690         int                  active = (conn->ksnc_proto != NULL);
1691         int                  timeout;
1692         int                  proto_match;
1693         int                  rc;
1694         ksock_proto_t       *proto;
1695         lnet_process_id_t    recv_id;
1696
1697         /* socket type set on active connections - not set on passive */
1698         LASSERT (!active == !(conn->ksnc_type != SOCKLND_CONN_NONE));
1699
1700         timeout = active ? *ksocknal_tunables.ksnd_timeout :
1701                             lnet_acceptor_timeout();
1702
1703         rc = libcfs_sock_read(sock, &hello->kshm_magic, sizeof (hello->kshm_magic), timeout);
1704         if (rc != 0) {
1705                 CERROR ("Error %d reading HELLO from %u.%u.%u.%u\n",
1706                         rc, HIPQUAD(conn->ksnc_ipaddr));
1707                 LASSERT (rc < 0);
1708                 return rc;
1709         }
1710
1711         if (hello->kshm_magic != LNET_PROTO_MAGIC &&
1712             hello->kshm_magic != __swab32(LNET_PROTO_MAGIC) &&
1713             hello->kshm_magic != le32_to_cpu (LNET_PROTO_TCP_MAGIC)) {
1714                 /* Unexpected magic! */
1715                 CERROR ("Bad magic(1) %#08x (%#08x expected) from "
1716                         "%u.%u.%u.%u\n", __cpu_to_le32 (hello->kshm_magic),
1717                         LNET_PROTO_TCP_MAGIC,
1718                         HIPQUAD(conn->ksnc_ipaddr));
1719                 return -EPROTO;
1720         }
1721
1722         rc = libcfs_sock_read(sock, &hello->kshm_version,
1723                               sizeof(hello->kshm_version), timeout);
1724         if (rc != 0) {
1725                 CERROR ("Error %d reading HELLO from %u.%u.%u.%u\n",
1726                         rc, HIPQUAD(conn->ksnc_ipaddr));
1727                 LASSERT (rc < 0);
1728                 return rc;
1729         }
1730
1731         proto = ksocknal_parse_proto_version(hello);
1732         if (proto == NULL) {
1733                 if (!active) {
1734                         /* unknown protocol from peer, tell peer my protocol */
1735                         conn->ksnc_proto = &ksocknal_protocol_v3x;
1736 #if SOCKNAL_VERSION_DEBUG
1737                         if (*ksocknal_tunables.ksnd_protocol == 2)
1738                                 conn->ksnc_proto = &ksocknal_protocol_v2x;
1739                         else if (*ksocknal_tunables.ksnd_protocol == 1)
1740                                 conn->ksnc_proto = &ksocknal_protocol_v1x;
1741 #endif
1742                         hello->kshm_nips = 0;
1743                         ksocknal_send_hello(ni, conn, ni->ni_nid, hello);
1744                 }
1745
1746                 CERROR ("Unknown protocol version (%d.x expected)"
1747                         " from %u.%u.%u.%u\n",
1748                         conn->ksnc_proto->pro_version,
1749                         HIPQUAD(conn->ksnc_ipaddr));
1750
1751                 return -EPROTO;
1752         }
1753
1754         proto_match = (conn->ksnc_proto == proto);
1755         conn->ksnc_proto = proto;
1756
1757         /* receive the rest of hello message anyway */
1758         rc = conn->ksnc_proto->pro_recv_hello(conn, hello, timeout);
1759         if (rc != 0) {
1760                 CERROR("Error %d reading or checking hello from from %u.%u.%u.%u\n",
1761                        rc, HIPQUAD(conn->ksnc_ipaddr));
1762                 LASSERT (rc < 0);
1763                 return rc;
1764         }
1765
1766         *incarnation = hello->kshm_src_incarnation;
1767
1768         if (hello->kshm_src_nid == LNET_NID_ANY) {
1769                 CERROR("Expecting a HELLO hdr with a NID, but got LNET_NID_ANY"
1770                        "from %u.%u.%u.%u\n", HIPQUAD(conn->ksnc_ipaddr));
1771                 return -EPROTO;
1772         }
1773
1774         if (!active &&
1775             conn->ksnc_port > LNET_ACCEPTOR_MAX_RESERVED_PORT) {
1776                 /* Userspace NAL assigns peer process ID from socket */
1777                 recv_id.pid = conn->ksnc_port | LNET_PID_USERFLAG;
1778                 recv_id.nid = LNET_MKNID(LNET_NIDNET(ni->ni_nid), conn->ksnc_ipaddr);
1779         } else {
1780                 recv_id.nid = hello->kshm_src_nid;
1781                 recv_id.pid = hello->kshm_src_pid;
1782         }
1783
1784         if (!active) {
1785                 *peerid = recv_id;
1786
1787                 /* peer determines type */
1788                 conn->ksnc_type = ksocknal_invert_type(hello->kshm_ctype);
1789                 if (conn->ksnc_type == SOCKLND_CONN_NONE) {
1790                         CERROR ("Unexpected type %d from %s ip %u.%u.%u.%u\n",
1791                                 hello->kshm_ctype, libcfs_id2str(*peerid),
1792                                 HIPQUAD(conn->ksnc_ipaddr));
1793                         return -EPROTO;
1794                 }
1795
1796                 return 0;
1797         }
1798
1799         if (peerid->pid != recv_id.pid ||
1800             peerid->nid != recv_id.nid) {
1801                 LCONSOLE_ERROR_MSG(0x130, "Connected successfully to %s on host"
1802                                    " %u.%u.%u.%u, but they claimed they were "
1803                                    "%s; please check your Lustre "
1804                                    "configuration.\n",
1805                                    libcfs_id2str(*peerid),
1806                                    HIPQUAD(conn->ksnc_ipaddr),
1807                                    libcfs_id2str(recv_id));
1808                 return -EPROTO;
1809         }
1810
1811         if (hello->kshm_ctype == SOCKLND_CONN_NONE) {
1812                 /* Possible protocol mismatch or I lost the connection race */
1813                 return proto_match ? EALREADY : EPROTO;
1814         }
1815
1816         if (ksocknal_invert_type(hello->kshm_ctype) != conn->ksnc_type) {
1817                 CERROR ("Mismatched types: me %d, %s ip %u.%u.%u.%u %d\n",
1818                         conn->ksnc_type, libcfs_id2str(*peerid),
1819                         HIPQUAD(conn->ksnc_ipaddr),
1820                         hello->kshm_ctype);
1821                 return -EPROTO;
1822         }
1823
1824         return 0;
1825 }
1826
1827 int
1828 ksocknal_connect (ksock_route_t *route)
1829 {
1830         CFS_LIST_HEAD    (zombies);
1831         ksock_peer_t     *peer = route->ksnr_peer;
1832         int               type;
1833         int               wanted;
1834         cfs_socket_t     *sock;
1835         cfs_time_t        deadline;
1836         int               retry_later = 0;
1837         int               rc = 0;
1838
1839         deadline = cfs_time_add(cfs_time_current(),
1840                                 cfs_time_seconds(*ksocknal_tunables.ksnd_timeout));
1841
1842         cfs_write_lock_bh (&ksocknal_data.ksnd_global_lock);
1843
1844         LASSERT (route->ksnr_scheduled);
1845         LASSERT (!route->ksnr_connecting);
1846
1847         route->ksnr_connecting = 1;
1848
1849         for (;;) {
1850                 wanted = ksocknal_route_mask() & ~route->ksnr_connected;
1851
1852                 /* stop connecting if peer/route got closed under me, or
1853                  * route got connected while queued */
1854                 if (peer->ksnp_closing || route->ksnr_deleted ||
1855                     wanted == 0) {
1856                         retry_later = 0;
1857                         break;
1858                 }
1859
1860                 /* reschedule if peer is connecting to me */
1861                 if (peer->ksnp_accepting > 0) {
1862                         CDEBUG(D_NET,
1863                                "peer %s(%d) already connecting to me, retry later.\n",
1864                                libcfs_nid2str(peer->ksnp_id.nid), peer->ksnp_accepting);
1865                         retry_later = 1;
1866                 }
1867
1868                 if (retry_later) /* needs reschedule */
1869                         break;
1870
1871                 if ((wanted & (1 << SOCKLND_CONN_ANY)) != 0) {
1872                         type = SOCKLND_CONN_ANY;
1873                 } else if ((wanted & (1 << SOCKLND_CONN_CONTROL)) != 0) {
1874                         type = SOCKLND_CONN_CONTROL;
1875                 } else if ((wanted & (1 << SOCKLND_CONN_BULK_IN)) != 0) {
1876                         type = SOCKLND_CONN_BULK_IN;
1877                 } else {
1878                         LASSERT ((wanted & (1 << SOCKLND_CONN_BULK_OUT)) != 0);
1879                         type = SOCKLND_CONN_BULK_OUT;
1880                 }
1881
1882                 cfs_write_unlock_bh (&ksocknal_data.ksnd_global_lock);
1883
1884                 if (cfs_time_aftereq(cfs_time_current(), deadline)) {
1885                         rc = -ETIMEDOUT;
1886                         lnet_connect_console_error(rc, peer->ksnp_id.nid,
1887                                                    route->ksnr_ipaddr,
1888                                                    route->ksnr_port);
1889                         goto failed;
1890                 }
1891
1892                 rc = lnet_connect(&sock, peer->ksnp_id.nid,
1893                                   route->ksnr_myipaddr,
1894                                   route->ksnr_ipaddr, route->ksnr_port);
1895                 if (rc != 0)
1896                         goto failed;
1897
1898                 rc = ksocknal_create_conn(peer->ksnp_ni, route, sock, type);
1899                 if (rc < 0) {
1900                         lnet_connect_console_error(rc, peer->ksnp_id.nid,
1901                                                    route->ksnr_ipaddr,
1902                                                    route->ksnr_port);
1903                         goto failed;
1904                 }
1905
1906                 /* A +ve RC means I have to retry because I lost the connection
1907                  * race or I have to renegotiate protocol version */
1908                 retry_later = (rc != 0);
1909                 if (retry_later)
1910                         CDEBUG(D_NET, "peer %s: conn race, retry later.\n",
1911                                libcfs_nid2str(peer->ksnp_id.nid));
1912
1913                 cfs_write_lock_bh (&ksocknal_data.ksnd_global_lock);
1914         }
1915
1916         route->ksnr_scheduled = 0;
1917         route->ksnr_connecting = 0;
1918
1919         if (retry_later) {
1920                 /* re-queue for attention; this frees me up to handle
1921                  * the peer's incoming connection request */
1922
1923                 if (rc == EALREADY ||
1924                     (rc == 0 && peer->ksnp_accepting > 0)) {
1925                         /* We want to introduce a delay before next
1926                          * attempt to connect if we lost conn race,
1927                          * but the race is resolved quickly usually,
1928                          * so min_reconnectms should be good heuristic */
1929                         route->ksnr_retry_interval =
1930                                 cfs_time_seconds(*ksocknal_tunables.ksnd_min_reconnectms)/1000;
1931                         route->ksnr_timeout = cfs_time_add(cfs_time_current(),
1932                                                            route->ksnr_retry_interval);
1933                 }
1934
1935                 ksocknal_launch_connection_locked(route);
1936         }
1937
1938         cfs_write_unlock_bh (&ksocknal_data.ksnd_global_lock);
1939         return retry_later;
1940
1941  failed:
1942         cfs_write_lock_bh (&ksocknal_data.ksnd_global_lock);
1943
1944         route->ksnr_scheduled = 0;
1945         route->ksnr_connecting = 0;
1946
1947         /* This is a retry rather than a new connection */
1948         route->ksnr_retry_interval *= 2;
1949         route->ksnr_retry_interval =
1950                 MAX(route->ksnr_retry_interval,
1951                     cfs_time_seconds(*ksocknal_tunables.ksnd_min_reconnectms)/1000);
1952         route->ksnr_retry_interval =
1953                 MIN(route->ksnr_retry_interval,
1954                     cfs_time_seconds(*ksocknal_tunables.ksnd_max_reconnectms)/1000);
1955
1956         LASSERT (route->ksnr_retry_interval != 0);
1957         route->ksnr_timeout = cfs_time_add(cfs_time_current(),
1958                                            route->ksnr_retry_interval);
1959
1960         if (!cfs_list_empty(&peer->ksnp_tx_queue) &&
1961             peer->ksnp_accepting == 0 &&
1962             ksocknal_find_connecting_route_locked(peer) == NULL) {
1963                 ksock_conn_t *conn;
1964
1965                 /* ksnp_tx_queue is queued on a conn on successful
1966                  * connection for V1.x and V2.x */
1967                 if (!cfs_list_empty (&peer->ksnp_conns)) {
1968                         conn = cfs_list_entry(peer->ksnp_conns.next,
1969                                               ksock_conn_t, ksnc_list);
1970                         LASSERT (conn->ksnc_proto == &ksocknal_protocol_v3x);
1971                 }
1972
1973                 /* take all the blocked packets while I've got the lock and
1974                  * complete below... */
1975                 cfs_list_splice_init(&peer->ksnp_tx_queue, &zombies);
1976         }
1977
1978 #if 0           /* irrelevent with only eager routes */
1979         if (!route->ksnr_deleted) {
1980                 /* make this route least-favourite for re-selection */
1981                 cfs_list_del(&route->ksnr_list);
1982                 cfs_list_add_tail(&route->ksnr_list, &peer->ksnp_routes);
1983         }
1984 #endif
1985         cfs_write_unlock_bh (&ksocknal_data.ksnd_global_lock);
1986
1987         ksocknal_peer_failed(peer);
1988         ksocknal_txlist_done(peer->ksnp_ni, &zombies, 1);
1989         return 0;
1990 }
1991
1992 /* Go through connd_routes queue looking for a route that
1993    we can process right now */
1994 static ksock_route_t *
1995 ksocknal_connd_get_route_locked(signed long *timeout_p)
1996 {
1997         ksock_route_t *route;
1998         cfs_time_t     now;
1999
2000         /* Only handle an outgoing connection request if there
2001          * is someone left to handle incoming connections */
2002         if ((ksocknal_data.ksnd_connd_connecting + 1) >=
2003             *ksocknal_tunables.ksnd_nconnds)
2004                 return NULL;
2005
2006         now = cfs_time_current();
2007
2008         /* connd_routes can contain both pending and ordinary routes */
2009         cfs_list_for_each_entry (route, &ksocknal_data.ksnd_connd_routes,
2010                                  ksnr_connd_list) {
2011
2012                 if (route->ksnr_retry_interval == 0 ||
2013                     cfs_time_aftereq(now, route->ksnr_timeout))
2014                         return route;
2015
2016                 if (*timeout_p == CFS_MAX_SCHEDULE_TIMEOUT ||
2017                     (int)*timeout_p > (int)(route->ksnr_timeout - now))
2018                         *timeout_p = (int)(route->ksnr_timeout - now);
2019         }
2020
2021         return NULL;
2022 }
2023
2024 int
2025 ksocknal_connd (void *arg)
2026 {
2027         long               id = (long)(long_ptr_t)arg;
2028         char               name[16];
2029         ksock_connreq_t   *cr;
2030         ksock_route_t     *route;
2031         cfs_waitlink_t     wait;
2032         signed long        timeout;
2033         int                nloops = 0;
2034         int                cons_retry = 0;
2035         int                dropped_lock;
2036
2037         snprintf (name, sizeof (name), "socknal_cd%02ld", id);
2038         cfs_daemonize (name);
2039         cfs_block_allsigs ();
2040
2041         cfs_waitlink_init (&wait);
2042
2043         cfs_spin_lock_bh (&ksocknal_data.ksnd_connd_lock);
2044
2045         while (!ksocknal_data.ksnd_shuttingdown) {
2046
2047                 dropped_lock = 0;
2048
2049                 if (!cfs_list_empty(&ksocknal_data.ksnd_connd_connreqs)) {
2050                         /* Connection accepted by the listener */
2051                         cr = cfs_list_entry(ksocknal_data.ksnd_connd_connreqs. \
2052                                             next, ksock_connreq_t, ksncr_list);
2053
2054                         cfs_list_del(&cr->ksncr_list);
2055                         cfs_spin_unlock_bh (&ksocknal_data.ksnd_connd_lock);
2056                         dropped_lock = 1;
2057
2058                         ksocknal_create_conn(cr->ksncr_ni, NULL,
2059                                              cr->ksncr_sock, SOCKLND_CONN_NONE);
2060                         lnet_ni_decref(cr->ksncr_ni);
2061                         LIBCFS_FREE(cr, sizeof(*cr));
2062
2063                         cfs_spin_lock_bh (&ksocknal_data.ksnd_connd_lock);
2064                 }
2065
2066                 /* Sleep till explicit wake_up if no pending routes present */
2067                 timeout = CFS_MAX_SCHEDULE_TIMEOUT;
2068
2069                 /* Connection request */
2070                 route = ksocknal_connd_get_route_locked(&timeout);
2071
2072                 if (route != NULL) {
2073                         cfs_list_del (&route->ksnr_connd_list);
2074                         ksocknal_data.ksnd_connd_connecting++;
2075                         cfs_spin_unlock_bh (&ksocknal_data.ksnd_connd_lock);
2076                         dropped_lock = 1;
2077
2078                         if (ksocknal_connect(route)) {
2079                                 /* consecutive retry */
2080                                 if (cons_retry++ > SOCKNAL_INSANITY_RECONN) {
2081                                         CWARN("massive consecutive "
2082                                               "re-connecting to %u.%u.%u.%u\n",
2083                                               HIPQUAD(route->ksnr_ipaddr));
2084                                         cons_retry = 0;
2085                                 }
2086                         } else {
2087                                 cons_retry = 0;
2088                         }
2089
2090                         ksocknal_route_decref(route);
2091
2092                         cfs_spin_lock_bh (&ksocknal_data.ksnd_connd_lock);
2093                         ksocknal_data.ksnd_connd_connecting--;
2094                 }
2095
2096                 if (dropped_lock) {
2097                         if (++nloops < SOCKNAL_RESCHED)
2098                                 continue;
2099                         cfs_spin_unlock_bh(&ksocknal_data.ksnd_connd_lock);
2100                         nloops = 0;
2101                         cfs_cond_resched();
2102                         cfs_spin_lock_bh(&ksocknal_data.ksnd_connd_lock);
2103                         continue;
2104                 }
2105
2106                 /* Nothing to do for 'timeout'  */
2107                 cfs_set_current_state (CFS_TASK_INTERRUPTIBLE);
2108                 cfs_waitq_add_exclusive (&ksocknal_data.ksnd_connd_waitq,
2109                                          &wait);
2110                 cfs_spin_unlock_bh (&ksocknal_data.ksnd_connd_lock);
2111
2112                 nloops = 0;
2113                 cfs_waitq_timedwait (&wait, CFS_TASK_INTERRUPTIBLE, timeout);
2114
2115                 cfs_set_current_state (CFS_TASK_RUNNING);
2116                 cfs_waitq_del (&ksocknal_data.ksnd_connd_waitq, &wait);
2117                 cfs_spin_lock_bh (&ksocknal_data.ksnd_connd_lock);
2118         }
2119
2120         cfs_spin_unlock_bh (&ksocknal_data.ksnd_connd_lock);
2121
2122         ksocknal_thread_fini ();
2123         return (0);
2124 }
2125
2126 ksock_conn_t *
2127 ksocknal_find_timed_out_conn (ksock_peer_t *peer)
2128 {
2129         /* We're called with a shared lock on ksnd_global_lock */
2130         ksock_conn_t      *conn;
2131         cfs_list_t        *ctmp;
2132
2133         cfs_list_for_each (ctmp, &peer->ksnp_conns) {
2134                 int     error;
2135                 conn = cfs_list_entry (ctmp, ksock_conn_t, ksnc_list);
2136
2137                 /* Don't need the {get,put}connsock dance to deref ksnc_sock */
2138                 LASSERT (!conn->ksnc_closing);
2139
2140                 /* SOCK_ERROR will reset error code of socket in
2141                  * some platform (like Darwin8.x) */
2142                 error = libcfs_sock_error(conn->ksnc_sock);
2143                 if (error != 0) {
2144                         ksocknal_conn_addref(conn);
2145
2146                         switch (error) {
2147                         case ECONNRESET:
2148                                 CDEBUG(D_NETERROR, "A connection with %s "
2149                                        "(%u.%u.%u.%u:%d) was reset; "
2150                                        "it may have rebooted.\n",
2151                                        libcfs_id2str(peer->ksnp_id),
2152                                        HIPQUAD(conn->ksnc_ipaddr),
2153                                        conn->ksnc_port);
2154                                 break;
2155                         case ETIMEDOUT:
2156                                 CDEBUG(D_NETERROR, "A connection with %s "
2157                                        "(%u.%u.%u.%u:%d) timed out; the "
2158                                        "network or node may be down.\n",
2159                                        libcfs_id2str(peer->ksnp_id),
2160                                        HIPQUAD(conn->ksnc_ipaddr),
2161                                        conn->ksnc_port);
2162                                 break;
2163                         default:
2164                                 CDEBUG(D_NETERROR, "An unexpected network error %d "
2165                                        "occurred with %s "
2166                                        "(%u.%u.%u.%u:%d\n", error,
2167                                        libcfs_id2str(peer->ksnp_id),
2168                                        HIPQUAD(conn->ksnc_ipaddr),
2169                                        conn->ksnc_port);
2170                                 break;
2171                         }
2172
2173                         return (conn);
2174                 }
2175
2176                 if (conn->ksnc_rx_started &&
2177                     cfs_time_aftereq(cfs_time_current(),
2178                                      conn->ksnc_rx_deadline)) {
2179                         /* Timed out incomplete incoming message */
2180                         ksocknal_conn_addref(conn);
2181                         CDEBUG(D_NETERROR, "Timeout receiving from %s "
2182                                "(%u.%u.%u.%u:%d), state %d wanted %d left %d\n",
2183                                libcfs_id2str(peer->ksnp_id),
2184                                HIPQUAD(conn->ksnc_ipaddr),
2185                                conn->ksnc_port,
2186                                conn->ksnc_rx_state,
2187                                conn->ksnc_rx_nob_wanted,
2188                                conn->ksnc_rx_nob_left);
2189                         return (conn);
2190                 }
2191
2192                 if ((!cfs_list_empty(&conn->ksnc_tx_queue) ||
2193                      libcfs_sock_wmem_queued(conn->ksnc_sock) != 0) &&
2194                     cfs_time_aftereq(cfs_time_current(),
2195                                      conn->ksnc_tx_deadline)) {
2196                         /* Timed out messages queued for sending or
2197                          * buffered in the socket's send buffer */
2198                         ksocknal_conn_addref(conn);
2199                         CDEBUG(D_NETERROR, "Timeout sending data to %s "
2200                                "(%u.%u.%u.%u:%d) the network or that "
2201                                "node may be down.\n",
2202                                libcfs_id2str(peer->ksnp_id),
2203                                HIPQUAD(conn->ksnc_ipaddr),
2204                                conn->ksnc_port);
2205                         return (conn);
2206                 }
2207         }
2208
2209         return (NULL);
2210 }
2211
2212 static inline void
2213 ksocknal_flush_stale_txs(ksock_peer_t *peer)
2214 {
2215         ksock_tx_t        *tx;
2216         CFS_LIST_HEAD      (stale_txs);
2217
2218         cfs_write_lock_bh (&ksocknal_data.ksnd_global_lock);
2219
2220         while (!cfs_list_empty (&peer->ksnp_tx_queue)) {
2221                 tx = cfs_list_entry (peer->ksnp_tx_queue.next,
2222                                      ksock_tx_t, tx_list);
2223
2224                 if (!cfs_time_aftereq(cfs_time_current(),
2225                                       tx->tx_deadline))
2226                         break;
2227
2228                 cfs_list_del (&tx->tx_list);
2229                 cfs_list_add_tail (&tx->tx_list, &stale_txs);
2230         }
2231
2232         cfs_write_unlock_bh (&ksocknal_data.ksnd_global_lock);
2233
2234         ksocknal_txlist_done(peer->ksnp_ni, &stale_txs, 1);
2235 }
2236
2237 int
2238 ksocknal_send_keepalive_locked(ksock_peer_t *peer)
2239 {
2240         ksock_sched_t  *sched;
2241         ksock_conn_t   *conn;
2242         ksock_tx_t     *tx;
2243
2244         if (cfs_list_empty(&peer->ksnp_conns)) /* last_alive will be updated by create_conn */
2245                 return 0;
2246
2247         if (peer->ksnp_proto != &ksocknal_protocol_v3x)
2248                 return 0;
2249
2250         if (*ksocknal_tunables.ksnd_keepalive <= 0 ||
2251             cfs_time_before(cfs_time_current(),
2252                             cfs_time_add(peer->ksnp_last_alive,
2253                                          cfs_time_seconds(*ksocknal_tunables.ksnd_keepalive))))
2254                 return 0;
2255
2256         if (cfs_time_before(cfs_time_current(),
2257                             peer->ksnp_send_keepalive))
2258                 return 0;
2259
2260         /* retry 10 secs later, so we wouldn't put pressure
2261          * on this peer if we failed to send keepalive this time */
2262         peer->ksnp_send_keepalive = cfs_time_shift(10);
2263
2264         conn = ksocknal_find_conn_locked(peer, NULL, 1);
2265         if (conn != NULL) {
2266                 sched = conn->ksnc_scheduler;
2267
2268                 cfs_spin_lock_bh (&sched->kss_lock);
2269                 if (!cfs_list_empty(&conn->ksnc_tx_queue)) {
2270                         cfs_spin_unlock_bh(&sched->kss_lock);
2271                         /* there is an queued ACK, don't need keepalive */
2272                         return 0;
2273                 }
2274
2275                 cfs_spin_unlock_bh(&sched->kss_lock);
2276         }
2277
2278         cfs_read_unlock(&ksocknal_data.ksnd_global_lock);
2279
2280         /* cookie = 1 is reserved for keepalive PING */
2281         tx = ksocknal_alloc_tx_noop(1, 1);
2282         if (tx == NULL) {
2283                 cfs_read_lock(&ksocknal_data.ksnd_global_lock);
2284                 return -ENOMEM;
2285         }
2286
2287         if (ksocknal_launch_packet(peer->ksnp_ni, tx, peer->ksnp_id) == 0) {
2288                 cfs_read_lock(&ksocknal_data.ksnd_global_lock);
2289                 return 1;
2290         }
2291
2292         ksocknal_free_tx(tx);
2293         cfs_read_lock(&ksocknal_data.ksnd_global_lock);
2294
2295         return -EIO;
2296 }
2297
2298
2299 void
2300 ksocknal_check_peer_timeouts (int idx)
2301 {
2302         cfs_list_t       *peers = &ksocknal_data.ksnd_peers[idx];
2303         ksock_peer_t     *peer;
2304         ksock_conn_t     *conn;
2305
2306  again:
2307         /* NB. We expect to have a look at all the peers and not find any
2308          * connections to time out, so we just use a shared lock while we
2309          * take a look... */
2310         cfs_read_lock (&ksocknal_data.ksnd_global_lock);
2311
2312         cfs_list_for_each_entry_typed(peer, peers, ksock_peer_t, ksnp_list) {
2313                 if (ksocknal_send_keepalive_locked(peer) != 0) {
2314                         cfs_read_unlock (&ksocknal_data.ksnd_global_lock);
2315                         goto again;
2316                 }
2317
2318                 conn = ksocknal_find_timed_out_conn (peer);
2319
2320                 if (conn != NULL) {
2321                         cfs_read_unlock (&ksocknal_data.ksnd_global_lock);
2322
2323                         ksocknal_close_conn_and_siblings (conn, -ETIMEDOUT);
2324
2325                         /* NB we won't find this one again, but we can't
2326                          * just proceed with the next peer, since we dropped
2327                          * ksnd_global_lock and it might be dead already! */
2328                         ksocknal_conn_decref(conn);
2329                         goto again;
2330                 }
2331
2332                 /* we can't process stale txs right here because we're
2333                  * holding only shared lock */
2334                 if (!cfs_list_empty (&peer->ksnp_tx_queue)) {
2335                         ksock_tx_t *tx =
2336                                 cfs_list_entry (peer->ksnp_tx_queue.next,
2337                                                 ksock_tx_t, tx_list);
2338
2339                         if (cfs_time_aftereq(cfs_time_current(),
2340                                              tx->tx_deadline)) {
2341
2342                                 ksocknal_peer_addref(peer);
2343                                 cfs_read_unlock (&ksocknal_data.ksnd_global_lock);
2344
2345                                 ksocknal_flush_stale_txs(peer);
2346
2347                                 ksocknal_peer_decref(peer);
2348                                 goto again;
2349                         }
2350                 }
2351         }
2352
2353         /* print out warnings about stale ZC_REQs */
2354         cfs_list_for_each_entry_typed(peer, peers, ksock_peer_t, ksnp_list) {
2355                 ksock_tx_t *tx;
2356                 int         n = 0;
2357
2358                 cfs_list_for_each_entry_typed(tx, &peer->ksnp_zc_req_list,
2359                                               ksock_tx_t, tx_zc_list) {
2360                         if (!cfs_time_aftereq(cfs_time_current(),
2361                                               tx->tx_deadline))
2362                                 break;
2363                         n++;
2364                 }
2365
2366                 if (n != 0) {
2367                         tx = cfs_list_entry (peer->ksnp_zc_req_list.next,
2368                                              ksock_tx_t, tx_zc_list);
2369                         CWARN("Stale ZC_REQs for peer %s detected: %d; the "
2370                               "oldest (%p) timed out %ld secs ago\n",
2371                               libcfs_nid2str(peer->ksnp_id.nid), n, tx,
2372                               cfs_duration_sec(cfs_time_current() -
2373                                                tx->tx_deadline));
2374                 }
2375         }
2376
2377         cfs_read_unlock (&ksocknal_data.ksnd_global_lock);
2378 }
2379
2380 int
2381 ksocknal_reaper (void *arg)
2382 {
2383         cfs_waitlink_t     wait;
2384         ksock_conn_t      *conn;
2385         ksock_sched_t     *sched;
2386         cfs_list_t         enomem_conns;
2387         int                nenomem_conns;
2388         cfs_duration_t     timeout;
2389         int                i;
2390         int                peer_index = 0;
2391         cfs_time_t         deadline = cfs_time_current();
2392
2393         cfs_daemonize ("socknal_reaper");
2394         cfs_block_allsigs ();
2395
2396         CFS_INIT_LIST_HEAD(&enomem_conns);
2397         cfs_waitlink_init (&wait);
2398
2399         cfs_spin_lock_bh (&ksocknal_data.ksnd_reaper_lock);
2400
2401         while (!ksocknal_data.ksnd_shuttingdown) {
2402
2403                 if (!cfs_list_empty (&ksocknal_data.ksnd_deathrow_conns)) {
2404                         conn = cfs_list_entry (ksocknal_data. \
2405                                                ksnd_deathrow_conns.next,
2406                                                ksock_conn_t, ksnc_list);
2407                         cfs_list_del (&conn->ksnc_list);
2408
2409                         cfs_spin_unlock_bh (&ksocknal_data.ksnd_reaper_lock);
2410
2411                         ksocknal_terminate_conn (conn);
2412                         ksocknal_conn_decref(conn);
2413
2414                         cfs_spin_lock_bh (&ksocknal_data.ksnd_reaper_lock);
2415                         continue;
2416                 }
2417
2418                 if (!cfs_list_empty (&ksocknal_data.ksnd_zombie_conns)) {
2419                         conn = cfs_list_entry (ksocknal_data.ksnd_zombie_conns.\
2420                                                next, ksock_conn_t, ksnc_list);
2421                         cfs_list_del (&conn->ksnc_list);
2422
2423                         cfs_spin_unlock_bh (&ksocknal_data.ksnd_reaper_lock);
2424
2425                         ksocknal_destroy_conn (conn);
2426
2427                         cfs_spin_lock_bh (&ksocknal_data.ksnd_reaper_lock);
2428                         continue;
2429                 }
2430
2431                 if (!cfs_list_empty (&ksocknal_data.ksnd_enomem_conns)) {
2432                         cfs_list_add(&enomem_conns,
2433                                      &ksocknal_data.ksnd_enomem_conns);
2434                         cfs_list_del_init(&ksocknal_data.ksnd_enomem_conns);
2435                 }
2436
2437                 cfs_spin_unlock_bh (&ksocknal_data.ksnd_reaper_lock);
2438
2439                 /* reschedule all the connections that stalled with ENOMEM... */
2440                 nenomem_conns = 0;
2441                 while (!cfs_list_empty (&enomem_conns)) {
2442                         conn = cfs_list_entry (enomem_conns.next,
2443                                                ksock_conn_t, ksnc_tx_list);
2444                         cfs_list_del (&conn->ksnc_tx_list);
2445
2446                         sched = conn->ksnc_scheduler;
2447
2448                         cfs_spin_lock_bh (&sched->kss_lock);
2449
2450                         LASSERT (conn->ksnc_tx_scheduled);
2451                         conn->ksnc_tx_ready = 1;
2452                         cfs_list_add_tail(&conn->ksnc_tx_list,
2453                                           &sched->kss_tx_conns);
2454                         cfs_waitq_signal (&sched->kss_waitq);
2455
2456                         cfs_spin_unlock_bh (&sched->kss_lock);
2457                         nenomem_conns++;
2458                 }
2459
2460                 /* careful with the jiffy wrap... */
2461                 while ((timeout = cfs_time_sub(deadline,
2462                                                cfs_time_current())) <= 0) {
2463                         const int n = 4;
2464                         const int p = 1;
2465                         int       chunk = ksocknal_data.ksnd_peer_hash_size;
2466
2467                         /* Time to check for timeouts on a few more peers: I do
2468                          * checks every 'p' seconds on a proportion of the peer
2469                          * table and I need to check every connection 'n' times
2470                          * within a timeout interval, to ensure I detect a
2471                          * timeout on any connection within (n+1)/n times the
2472                          * timeout interval. */
2473
2474                         if (*ksocknal_tunables.ksnd_timeout > n * p)
2475                                 chunk = (chunk * n * p) /
2476                                         *ksocknal_tunables.ksnd_timeout;
2477                         if (chunk == 0)
2478                                 chunk = 1;
2479
2480                         for (i = 0; i < chunk; i++) {
2481                                 ksocknal_check_peer_timeouts (peer_index);
2482                                 peer_index = (peer_index + 1) %
2483                                              ksocknal_data.ksnd_peer_hash_size;
2484                         }
2485
2486                         deadline = cfs_time_add(deadline, cfs_time_seconds(p));
2487                 }
2488
2489                 if (nenomem_conns != 0) {
2490                         /* Reduce my timeout if I rescheduled ENOMEM conns.
2491                          * This also prevents me getting woken immediately
2492                          * if any go back on my enomem list. */
2493                         timeout = SOCKNAL_ENOMEM_RETRY;
2494                 }
2495                 ksocknal_data.ksnd_reaper_waketime =
2496                         cfs_time_add(cfs_time_current(), timeout);
2497
2498                 cfs_set_current_state (CFS_TASK_INTERRUPTIBLE);
2499                 cfs_waitq_add (&ksocknal_data.ksnd_reaper_waitq, &wait);
2500
2501                 if (!ksocknal_data.ksnd_shuttingdown &&
2502                     cfs_list_empty (&ksocknal_data.ksnd_deathrow_conns) &&
2503                     cfs_list_empty (&ksocknal_data.ksnd_zombie_conns))
2504                         cfs_waitq_timedwait (&wait, CFS_TASK_INTERRUPTIBLE,
2505                                              timeout);
2506
2507                 cfs_set_current_state (CFS_TASK_RUNNING);
2508                 cfs_waitq_del (&ksocknal_data.ksnd_reaper_waitq, &wait);
2509
2510                 cfs_spin_lock_bh (&ksocknal_data.ksnd_reaper_lock);
2511         }
2512
2513         cfs_spin_unlock_bh (&ksocknal_data.ksnd_reaper_lock);
2514
2515         ksocknal_thread_fini ();
2516         return (0);
2517 }