lnet/klnds/socklnd/socklnd.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, 2014, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lnet/klnds/socklnd/socklnd.c
  37  *
  38  * Author: Zach Brown <zab@zabbo.net>
  39  * Author: Peter J. Braam <braam@clusterfs.com>
  40  * Author: Phil Schwan <phil@clusterfs.com>
  41  * Author: Eric Barton <eric@bartonsoftware.com>
  42  */
  43
  44 #include "socklnd.h"
  45
  46 static lnd_t                   the_ksocklnd;
  47 ksock_nal_data_t        ksocknal_data;
  48
  49 static ksock_interface_t *
  50 ksocknal_ip2iface(lnet_ni_t *ni, __u32 ip)
  51 {
  52         ksock_net_t       *net = ni->ni_data;
  53         int                i;
  54         ksock_interface_t *iface;
  55
  56         for (i = 0; i < net->ksnn_ninterfaces; i++) {
  57                 LASSERT(i < LNET_MAX_INTERFACES);
  58                 iface = &net->ksnn_interfaces[i];
  59
  60                 if (iface->ksni_ipaddr == ip)
  61                         return (iface);
  62         }
  63
  64         return (NULL);
  65 }
  66
  67 static ksock_route_t *
  68 ksocknal_create_route (__u32 ipaddr, int port)
  69 {
  70         ksock_route_t *route;
  71
  72         LIBCFS_ALLOC (route, sizeof (*route));
  73         if (route == NULL)
  74                 return (NULL);
  75
  76         atomic_set (&route->ksnr_refcount, 1);
  77         route->ksnr_peer = NULL;
  78         route->ksnr_retry_interval = 0;         /* OK to connect at any time */
  79         route->ksnr_ipaddr = ipaddr;
  80         route->ksnr_port = port;
  81         route->ksnr_scheduled = 0;
  82         route->ksnr_connecting = 0;
  83         route->ksnr_connected = 0;
  84         route->ksnr_deleted = 0;
  85         route->ksnr_conn_count = 0;
  86         route->ksnr_share_count = 0;
  87
  88         return (route);
  89 }
  90
  91 void
  92 ksocknal_destroy_route (ksock_route_t *route)
  93 {
  94         LASSERT (atomic_read(&route->ksnr_refcount) == 0);
  95
  96         if (route->ksnr_peer != NULL)
  97                 ksocknal_peer_decref(route->ksnr_peer);
  98
  99         LIBCFS_FREE (route, sizeof (*route));
 100 }
 101
 102 static int
 103 ksocknal_create_peer(ksock_peer_t **peerp, lnet_ni_t *ni, lnet_process_id_t id)
 104 {
 105         int             cpt = lnet_cpt_of_nid(id.nid);
 106         ksock_net_t     *net = ni->ni_data;
 107         ksock_peer_t    *peer;
 108
 109         LASSERT(id.nid != LNET_NID_ANY);
 110         LASSERT(id.pid != LNET_PID_ANY);
 111         LASSERT(!in_interrupt());
 112
 113         LIBCFS_CPT_ALLOC(peer, lnet_cpt_table(), cpt, sizeof(*peer));
 114         if (peer == NULL)
 115                 return -ENOMEM;
 116
 117         peer->ksnp_ni = ni;
 118         peer->ksnp_id = id;
 119         atomic_set(&peer->ksnp_refcount, 1);    /* 1 ref for caller */
 120         peer->ksnp_closing = 0;
 121         peer->ksnp_accepting = 0;
 122         peer->ksnp_proto = NULL;
 123         peer->ksnp_last_alive = 0;
 124         peer->ksnp_zc_next_cookie = SOCKNAL_KEEPALIVE_PING + 1;
 125
 126         INIT_LIST_HEAD(&peer->ksnp_conns);
 127         INIT_LIST_HEAD(&peer->ksnp_routes);
 128         INIT_LIST_HEAD(&peer->ksnp_tx_queue);
 129         INIT_LIST_HEAD(&peer->ksnp_zc_req_list);
 130         spin_lock_init(&peer->ksnp_lock);
 131
 132         spin_lock_bh(&net->ksnn_lock);
 133
 134         if (net->ksnn_shutdown) {
 135                 spin_unlock_bh(&net->ksnn_lock);
 136
 137                 LIBCFS_FREE(peer, sizeof(*peer));
 138                 CERROR("Can't create peer: network shutdown\n");
 139                 return -ESHUTDOWN;
 140         }
 141
 142         net->ksnn_npeers++;
 143
 144         spin_unlock_bh(&net->ksnn_lock);
 145
 146         *peerp = peer;
 147         return 0;
 148 }
 149
 150 void
 151 ksocknal_destroy_peer (ksock_peer_t *peer)
 152 {
 153         ksock_net_t    *net = peer->ksnp_ni->ni_data;
 154
 155         CDEBUG (D_NET, "peer %s %p deleted\n",
 156                 libcfs_id2str(peer->ksnp_id), peer);
 157
 158         LASSERT(atomic_read(&peer->ksnp_refcount) == 0);
 159         LASSERT(peer->ksnp_accepting == 0);
 160         LASSERT(list_empty(&peer->ksnp_conns));
 161         LASSERT(list_empty(&peer->ksnp_routes));
 162         LASSERT(list_empty(&peer->ksnp_tx_queue));
 163         LASSERT(list_empty(&peer->ksnp_zc_req_list));
 164
 165         LIBCFS_FREE(peer, sizeof(*peer));
 166
 167         /* NB a peer's connections and routes keep a reference on their peer
 168          * until they are destroyed, so we can be assured that _all_ state to
 169          * do with this peer has been cleaned up when its refcount drops to
 170          * zero. */
 171         spin_lock_bh(&net->ksnn_lock);
 172         net->ksnn_npeers--;
 173         spin_unlock_bh(&net->ksnn_lock);
 174 }
 175
 176 ksock_peer_t *
 177 ksocknal_find_peer_locked (lnet_ni_t *ni, lnet_process_id_t id)
 178 {
 179         struct list_head *peer_list = ksocknal_nid2peerlist(id.nid);
 180         struct list_head *tmp;
 181         ksock_peer_t     *peer;
 182
 183         list_for_each(tmp, peer_list) {
 184
 185                 peer = list_entry(tmp, ksock_peer_t, ksnp_list);
 186
 187                 LASSERT(!peer->ksnp_closing);
 188
 189                 if (peer->ksnp_ni != ni)
 190                         continue;
 191
 192                 if (peer->ksnp_id.nid != id.nid ||
 193                     peer->ksnp_id.pid != id.pid)
 194                         continue;
 195
 196                 CDEBUG(D_NET, "got peer [%p] -> %s (%d)\n",
 197                        peer, libcfs_id2str(id),
 198                        atomic_read(&peer->ksnp_refcount));
 199                 return peer;
 200         }
 201         return NULL;
 202 }
 203
 204 ksock_peer_t *
 205 ksocknal_find_peer (lnet_ni_t *ni, lnet_process_id_t id)
 206 {
 207         ksock_peer_t     *peer;
 208
 209         read_lock(&ksocknal_data.ksnd_global_lock);
 210         peer = ksocknal_find_peer_locked(ni, id);
 211         if (peer != NULL)                       /* +1 ref for caller? */
 212                 ksocknal_peer_addref(peer);
 213         read_unlock(&ksocknal_data.ksnd_global_lock);
 214
 215         return (peer);
 216 }
 217
 218 static void
 219 ksocknal_unlink_peer_locked (ksock_peer_t *peer)
 220 {
 221         int                i;
 222         __u32              ip;
 223         ksock_interface_t *iface;
 224
 225         for (i = 0; i < peer->ksnp_n_passive_ips; i++) {
 226                 LASSERT (i < LNET_MAX_INTERFACES);
 227                 ip = peer->ksnp_passive_ips[i];
 228
 229                 iface = ksocknal_ip2iface(peer->ksnp_ni, ip);
 230                 /* All IPs in peer->ksnp_passive_ips[] come from the
 231                  * interface list, therefore the call must succeed. */
 232                 LASSERT (iface != NULL);
 233
 234                 CDEBUG(D_NET, "peer=%p iface=%p ksni_nroutes=%d\n",
 235                        peer, iface, iface->ksni_nroutes);
 236                 iface->ksni_npeers--;
 237         }
 238
 239         LASSERT(list_empty(&peer->ksnp_conns));
 240         LASSERT(list_empty(&peer->ksnp_routes));
 241         LASSERT(!peer->ksnp_closing);
 242         peer->ksnp_closing = 1;
 243         list_del(&peer->ksnp_list);
 244         /* lose peerlist's ref */
 245         ksocknal_peer_decref(peer);
 246 }
 247
 248 static int
 249 ksocknal_get_peer_info (lnet_ni_t *ni, int index,
 250                         lnet_process_id_t *id, __u32 *myip, __u32 *peer_ip,
 251                         int *port, int *conn_count, int *share_count)
 252 {
 253         ksock_peer_t      *peer;
 254         struct list_head  *ptmp;
 255         ksock_route_t     *route;
 256         struct list_head  *rtmp;
 257         int                i;
 258         int                j;
 259         int                rc = -ENOENT;
 260
 261         read_lock(&ksocknal_data.ksnd_global_lock);
 262
 263         for (i = 0; i < ksocknal_data.ksnd_peer_hash_size; i++) {
 264                 list_for_each(ptmp, &ksocknal_data.ksnd_peers[i]) {
 265                         peer = list_entry(ptmp, ksock_peer_t, ksnp_list);
 266
 267                         if (peer->ksnp_ni != ni)
 268                                 continue;
 269
 270                         if (peer->ksnp_n_passive_ips == 0 &&
 271                             list_empty(&peer->ksnp_routes)) {
 272                                 if (index-- > 0)
 273                                         continue;
 274
 275                                 *id = peer->ksnp_id;
 276                                 *myip = 0;
 277                                 *peer_ip = 0;
 278                                 *port = 0;
 279                                 *conn_count = 0;
 280                                 *share_count = 0;
 281                                 rc = 0;
 282                                 goto out;
 283                         }
 284
 285                         for (j = 0; j < peer->ksnp_n_passive_ips; j++) {
 286                                 if (index-- > 0)
 287                                         continue;
 288
 289                                 *id = peer->ksnp_id;
 290                                 *myip = peer->ksnp_passive_ips[j];
 291                                 *peer_ip = 0;
 292                                 *port = 0;
 293                                 *conn_count = 0;
 294                                 *share_count = 0;
 295                                 rc = 0;
 296                                 goto out;
 297                         }
 298
 299                         list_for_each(rtmp, &peer->ksnp_routes) {
 300                                 if (index-- > 0)
 301                                         continue;
 302
 303                                 route = list_entry(rtmp, ksock_route_t,
 304                                                    ksnr_list);
 305
 306                                 *id = peer->ksnp_id;
 307                                 *myip = route->ksnr_myipaddr;
 308                                 *peer_ip = route->ksnr_ipaddr;
 309                                 *port = route->ksnr_port;
 310                                 *conn_count = route->ksnr_conn_count;
 311                                 *share_count = route->ksnr_share_count;
 312                                 rc = 0;
 313                                 goto out;
 314                         }
 315                 }
 316         }
 317 out:
 318         read_unlock(&ksocknal_data.ksnd_global_lock);
 319         return rc;
 320 }
 321
 322 static void
 323 ksocknal_associate_route_conn_locked(ksock_route_t *route, ksock_conn_t *conn)
 324 {
 325         ksock_peer_t      *peer = route->ksnr_peer;
 326         int                type = conn->ksnc_type;
 327         ksock_interface_t *iface;
 328
 329         conn->ksnc_route = route;
 330         ksocknal_route_addref(route);
 331
 332         if (route->ksnr_myipaddr != conn->ksnc_myipaddr) {
 333                 if (route->ksnr_myipaddr == 0) {
 334                         /* route wasn't bound locally yet (the initial route) */
 335                         CDEBUG(D_NET, "Binding %s %pI4h to %pI4h\n",
 336                                libcfs_id2str(peer->ksnp_id),
 337                                &route->ksnr_ipaddr,
 338                                &conn->ksnc_myipaddr);
 339                 } else {
 340                         CDEBUG(D_NET, "Rebinding %s %pI4h from %pI4h "
 341                                "to %pI4h\n", libcfs_id2str(peer->ksnp_id),
 342                                &route->ksnr_ipaddr,
 343                                &route->ksnr_myipaddr,
 344                                &conn->ksnc_myipaddr);
 345
 346                         iface = ksocknal_ip2iface(route->ksnr_peer->ksnp_ni,
 347                                                   route->ksnr_myipaddr);
 348                         if (iface != NULL)
 349                                 iface->ksni_nroutes--;
 350                 }
 351                 route->ksnr_myipaddr = conn->ksnc_myipaddr;
 352                 iface = ksocknal_ip2iface(route->ksnr_peer->ksnp_ni,
 353                                           route->ksnr_myipaddr);
 354                 if (iface != NULL)
 355                         iface->ksni_nroutes++;
 356         }
 357
 358         route->ksnr_connected |= (1<<type);
 359         route->ksnr_conn_count++;
 360
 361         /* Successful connection => further attempts can
 362          * proceed immediately */
 363         route->ksnr_retry_interval = 0;
 364 }
 365
 366 static void
 367 ksocknal_add_route_locked (ksock_peer_t *peer, ksock_route_t *route)
 368 {
 369         struct list_head *tmp;
 370         ksock_conn_t     *conn;
 371         ksock_route_t    *route2;
 372
 373         LASSERT(!peer->ksnp_closing);
 374         LASSERT(route->ksnr_peer == NULL);
 375         LASSERT(!route->ksnr_scheduled);
 376         LASSERT(!route->ksnr_connecting);
 377         LASSERT(route->ksnr_connected == 0);
 378
 379         /* LASSERT(unique) */
 380         list_for_each(tmp, &peer->ksnp_routes) {
 381                 route2 = list_entry(tmp, ksock_route_t, ksnr_list);
 382
 383                 if (route2->ksnr_ipaddr == route->ksnr_ipaddr) {
 384                         CERROR("Duplicate route %s %pI4h\n",
 385                                libcfs_id2str(peer->ksnp_id),
 386                                &route->ksnr_ipaddr);
 387                         LBUG();
 388                 }
 389         }
 390
 391         route->ksnr_peer = peer;
 392         ksocknal_peer_addref(peer);
 393         /* peer's routelist takes over my ref on 'route' */
 394         list_add_tail(&route->ksnr_list, &peer->ksnp_routes);
 395
 396         list_for_each(tmp, &peer->ksnp_conns) {
 397                 conn = list_entry(tmp, ksock_conn_t, ksnc_list);
 398
 399                 if (conn->ksnc_ipaddr != route->ksnr_ipaddr)
 400                         continue;
 401
 402                 ksocknal_associate_route_conn_locked(route, conn);
 403                 /* keep going (typed routes) */
 404         }
 405 }
 406
 407 static void
 408 ksocknal_del_route_locked (ksock_route_t *route)
 409 {
 410         ksock_peer_t      *peer = route->ksnr_peer;
 411         ksock_interface_t *iface;
 412         ksock_conn_t      *conn;
 413         struct list_head  *ctmp;
 414         struct list_head  *cnxt;
 415
 416         LASSERT(!route->ksnr_deleted);
 417
 418         /* Close associated conns */
 419         list_for_each_safe(ctmp, cnxt, &peer->ksnp_conns) {
 420                 conn = list_entry(ctmp, ksock_conn_t, ksnc_list);
 421
 422                 if (conn->ksnc_route != route)
 423                         continue;
 424
 425                 ksocknal_close_conn_locked(conn, 0);
 426         }
 427
 428         if (route->ksnr_myipaddr != 0) {
 429                 iface = ksocknal_ip2iface(route->ksnr_peer->ksnp_ni,
 430                                           route->ksnr_myipaddr);
 431                 if (iface != NULL)
 432                         iface->ksni_nroutes--;
 433         }
 434
 435         route->ksnr_deleted = 1;
 436         list_del(&route->ksnr_list);
 437         ksocknal_route_decref(route);           /* drop peer's ref */
 438
 439         if (list_empty(&peer->ksnp_routes) &&
 440             list_empty(&peer->ksnp_conns)) {
 441                 /* I've just removed the last route to a peer with no active
 442                  * connections */
 443                 ksocknal_unlink_peer_locked(peer);
 444         }
 445 }
 446
 447 int
 448 ksocknal_add_peer(lnet_ni_t *ni, lnet_process_id_t id, __u32 ipaddr, int port)
 449 {
 450         struct list_head *tmp;
 451         ksock_peer_t     *peer;
 452         ksock_peer_t     *peer2;
 453         ksock_route_t    *route;
 454         ksock_route_t    *route2;
 455         int               rc;
 456
 457         if (id.nid == LNET_NID_ANY ||
 458             id.pid == LNET_PID_ANY)
 459                 return (-EINVAL);
 460
 461         /* Have a brand new peer ready... */
 462         rc = ksocknal_create_peer(&peer, ni, id);
 463         if (rc != 0)
 464                 return rc;
 465
 466         route = ksocknal_create_route (ipaddr, port);
 467         if (route == NULL) {
 468                 ksocknal_peer_decref(peer);
 469                 return (-ENOMEM);
 470         }
 471
 472         write_lock_bh(&ksocknal_data.ksnd_global_lock);
 473
 474         /* always called with a ref on ni, so shutdown can't have started */
 475         LASSERT (((ksock_net_t *) ni->ni_data)->ksnn_shutdown == 0);
 476
 477         peer2 = ksocknal_find_peer_locked(ni, id);
 478         if (peer2 != NULL) {
 479                 ksocknal_peer_decref(peer);
 480                 peer = peer2;
 481         } else {
 482                 /* peer table takes my ref on peer */
 483                 list_add_tail(&peer->ksnp_list,
 484                               ksocknal_nid2peerlist(id.nid));
 485         }
 486
 487         route2 = NULL;
 488         list_for_each(tmp, &peer->ksnp_routes) {
 489                 route2 = list_entry(tmp, ksock_route_t, ksnr_list);
 490
 491                 if (route2->ksnr_ipaddr == ipaddr)
 492                         break;
 493
 494                 route2 = NULL;
 495         }
 496         if (route2 == NULL) {
 497                 ksocknal_add_route_locked(peer, route);
 498                 route->ksnr_share_count++;
 499         } else {
 500                 ksocknal_route_decref(route);
 501                 route2->ksnr_share_count++;
 502         }
 503
 504         write_unlock_bh(&ksocknal_data.ksnd_global_lock);
 505
 506         return 0;
 507 }
 508
 509 static void
 510 ksocknal_del_peer_locked (ksock_peer_t *peer, __u32 ip)
 511 {
 512         ksock_conn_t     *conn;
 513         ksock_route_t    *route;
 514         struct list_head *tmp;
 515         struct list_head *nxt;
 516         int               nshared;
 517
 518         LASSERT(!peer->ksnp_closing);
 519
 520         /* Extra ref prevents peer disappearing until I'm done with it */
 521         ksocknal_peer_addref(peer);
 522
 523         list_for_each_safe(tmp, nxt, &peer->ksnp_routes) {
 524                 route = list_entry(tmp, ksock_route_t, ksnr_list);
 525
 526                 /* no match */
 527                 if (!(ip == 0 || route->ksnr_ipaddr == ip))
 528                         continue;
 529
 530                 route->ksnr_share_count = 0;
 531                 /* This deletes associated conns too */
 532                 ksocknal_del_route_locked(route);
 533         }
 534
 535         nshared = 0;
 536         list_for_each_safe(tmp, nxt, &peer->ksnp_routes) {
 537                 route = list_entry(tmp, ksock_route_t, ksnr_list);
 538                 nshared += route->ksnr_share_count;
 539         }
 540
 541         if (nshared == 0) {
 542                 /* remove everything else if there are no explicit entries
 543                  * left */
 544
 545                 list_for_each_safe(tmp, nxt, &peer->ksnp_routes) {
 546                         route = list_entry(tmp, ksock_route_t, ksnr_list);
 547
 548                         /* we should only be removing auto-entries */
 549                         LASSERT(route->ksnr_share_count == 0);
 550                         ksocknal_del_route_locked(route);
 551                 }
 552
 553                 list_for_each_safe(tmp, nxt, &peer->ksnp_conns) {
 554                         conn = list_entry(tmp, ksock_conn_t, ksnc_list);
 555
 556                         ksocknal_close_conn_locked(conn, 0);
 557                 }
 558         }
 559
 560         ksocknal_peer_decref(peer);
 561                 /* NB peer unlinks itself when last conn/route is removed */
 562 }
 563
 564 static int
 565 ksocknal_del_peer (lnet_ni_t *ni, lnet_process_id_t id, __u32 ip)
 566 {
 567         struct list_head  zombies = LIST_HEAD_INIT(zombies);
 568         struct list_head *ptmp;
 569         struct list_head *pnxt;
 570         ksock_peer_t     *peer;
 571         int               lo;
 572         int               hi;
 573         int               i;
 574         int               rc = -ENOENT;
 575
 576         write_lock_bh(&ksocknal_data.ksnd_global_lock);
 577
 578         if (id.nid != LNET_NID_ANY) {
 579                 hi = (int)(ksocknal_nid2peerlist(id.nid) -
 580                            ksocknal_data.ksnd_peers);
 581                 lo = hi;
 582         } else {
 583                 lo = 0;
 584                 hi = ksocknal_data.ksnd_peer_hash_size - 1;
 585         }
 586
 587         for (i = lo; i <= hi; i++) {
 588                 list_for_each_safe(ptmp, pnxt,
 589                                    &ksocknal_data.ksnd_peers[i]) {
 590                         peer = list_entry(ptmp, ksock_peer_t, ksnp_list);
 591
 592                         if (peer->ksnp_ni != ni)
 593                                 continue;
 594
 595                         if (!((id.nid == LNET_NID_ANY ||
 596                                peer->ksnp_id.nid == id.nid) &&
 597                               (id.pid == LNET_PID_ANY ||
 598                                peer->ksnp_id.pid == id.pid)))
 599                                 continue;
 600
 601                         ksocknal_peer_addref(peer);     /* a ref for me... */
 602
 603                         ksocknal_del_peer_locked(peer, ip);
 604
 605                         if (peer->ksnp_closing &&
 606                             !list_empty(&peer->ksnp_tx_queue)) {
 607                                 LASSERT(list_empty(&peer->ksnp_conns));
 608                                 LASSERT(list_empty(&peer->ksnp_routes));
 609
 610                                 list_splice_init(&peer->ksnp_tx_queue,
 611                                                  &zombies);
 612                         }
 613
 614                         ksocknal_peer_decref(peer);     /* ...till here */
 615
 616                         rc = 0;                         /* matched! */
 617                 }
 618         }
 619
 620         write_unlock_bh(&ksocknal_data.ksnd_global_lock);
 621
 622         ksocknal_txlist_done(ni, &zombies, 1);
 623
 624         return rc;
 625 }
 626
 627 static ksock_conn_t *
 628 ksocknal_get_conn_by_idx (lnet_ni_t *ni, int index)
 629 {
 630         ksock_peer_t     *peer;
 631         struct list_head *ptmp;
 632         ksock_conn_t     *conn;
 633         struct list_head *ctmp;
 634         int               i;
 635
 636         read_lock(&ksocknal_data.ksnd_global_lock);
 637
 638         for (i = 0; i < ksocknal_data.ksnd_peer_hash_size; i++) {
 639                 list_for_each(ptmp, &ksocknal_data.ksnd_peers[i]) {
 640                         peer = list_entry(ptmp, ksock_peer_t, ksnp_list);
 641
 642                         LASSERT(!peer->ksnp_closing);
 643
 644                         if (peer->ksnp_ni != ni)
 645                                 continue;
 646
 647                         list_for_each(ctmp, &peer->ksnp_conns) {
 648                                 if (index-- > 0)
 649                                         continue;
 650
 651                                 conn = list_entry(ctmp, ksock_conn_t,
 652                                                   ksnc_list);
 653                                 ksocknal_conn_addref(conn);
 654                                 read_unlock(&ksocknal_data. \
 655                                             ksnd_global_lock);
 656                                 return conn;
 657                         }
 658                 }
 659         }
 660
 661         read_unlock(&ksocknal_data.ksnd_global_lock);
 662         return NULL;
 663 }
 664
 665 static ksock_sched_t *
 666 ksocknal_choose_scheduler_locked(unsigned int cpt)
 667 {
 668         struct ksock_sched_info *info = ksocknal_data.ksnd_sched_info[cpt];
 669         ksock_sched_t           *sched;
 670         int                     i;
 671
 672         LASSERT(info->ksi_nthreads > 0);
 673
 674         sched = &info->ksi_scheds[0];
 675         /*
 676          * NB: it's safe so far, but info->ksi_nthreads could be changed
 677          * at runtime when we have dynamic LNet configuration, then we
 678          * need to take care of this.
 679          */
 680         for (i = 1; i < info->ksi_nthreads; i++) {
 681                 if (sched->kss_nconns > info->ksi_scheds[i].kss_nconns)
 682                         sched = &info->ksi_scheds[i];
 683         }
 684
 685         return sched;
 686 }
 687
 688 static int
 689 ksocknal_local_ipvec (lnet_ni_t *ni, __u32 *ipaddrs)
 690 {
 691         ksock_net_t       *net = ni->ni_data;
 692         int                i;
 693         int                nip;
 694
 695         read_lock(&ksocknal_data.ksnd_global_lock);
 696
 697         nip = net->ksnn_ninterfaces;
 698         LASSERT (nip <= LNET_MAX_INTERFACES);
 699
 700         /* Only offer interfaces for additional connections if I have
 701          * more than one. */
 702         if (nip < 2) {
 703                 read_unlock(&ksocknal_data.ksnd_global_lock);
 704                 return 0;
 705         }
 706
 707         for (i = 0; i < nip; i++) {
 708                 ipaddrs[i] = net->ksnn_interfaces[i].ksni_ipaddr;
 709                 LASSERT (ipaddrs[i] != 0);
 710         }
 711
 712         read_unlock(&ksocknal_data.ksnd_global_lock);
 713         return (nip);
 714 }
 715
 716 static int
 717 ksocknal_match_peerip (ksock_interface_t *iface, __u32 *ips, int nips)
 718 {
 719         int   best_netmatch = 0;
 720         int   best_xor      = 0;
 721         int   best          = -1;
 722         int   this_xor;
 723         int   this_netmatch;
 724         int   i;
 725
 726         for (i = 0; i < nips; i++) {
 727                 if (ips[i] == 0)
 728                         continue;
 729
 730                 this_xor = (ips[i] ^ iface->ksni_ipaddr);
 731                 this_netmatch = ((this_xor & iface->ksni_netmask) == 0) ? 1 : 0;
 732
 733                 if (!(best < 0 ||
 734                       best_netmatch < this_netmatch ||
 735                       (best_netmatch == this_netmatch &&
 736                        best_xor > this_xor)))
 737                         continue;
 738
 739                 best = i;
 740                 best_netmatch = this_netmatch;
 741                 best_xor = this_xor;
 742         }
 743
 744         LASSERT (best >= 0);
 745         return (best);
 746 }
 747
 748 static int
 749 ksocknal_select_ips(ksock_peer_t *peer, __u32 *peerips, int n_peerips)
 750 {
 751         rwlock_t                *global_lock = &ksocknal_data.ksnd_global_lock;
 752         ksock_net_t        *net = peer->ksnp_ni->ni_data;
 753         ksock_interface_t  *iface;
 754         ksock_interface_t  *best_iface;
 755         int                 n_ips;
 756         int                 i;
 757         int                 j;
 758         int                 k;
 759         __u32               ip;
 760         __u32               xor;
 761         int                 this_netmatch;
 762         int                 best_netmatch;
 763         int                 best_npeers;
 764
 765         /* CAVEAT EMPTOR: We do all our interface matching with an
 766          * exclusive hold of global lock at IRQ priority.  We're only
 767          * expecting to be dealing with small numbers of interfaces, so the
 768          * O(n**3)-ness shouldn't matter */
 769
 770         /* Also note that I'm not going to return more than n_peerips
 771          * interfaces, even if I have more myself */
 772
 773         write_lock_bh(global_lock);
 774
 775         LASSERT (n_peerips <= LNET_MAX_INTERFACES);
 776         LASSERT (net->ksnn_ninterfaces <= LNET_MAX_INTERFACES);
 777
 778         /* Only match interfaces for additional connections
 779          * if I have > 1 interface */
 780         n_ips = (net->ksnn_ninterfaces < 2) ? 0 :
 781                 MIN(n_peerips, net->ksnn_ninterfaces);
 782
 783         for (i = 0; peer->ksnp_n_passive_ips < n_ips; i++) {
 784                 /*              ^ yes really... */
 785
 786                 /* If we have any new interfaces, first tick off all the
 787                  * peer IPs that match old interfaces, then choose new
 788                  * interfaces to match the remaining peer IPS.
 789                  * We don't forget interfaces we've stopped using; we might
 790                  * start using them again... */
 791
 792                 if (i < peer->ksnp_n_passive_ips) {
 793                         /* Old interface. */
 794                         ip = peer->ksnp_passive_ips[i];
 795                         best_iface = ksocknal_ip2iface(peer->ksnp_ni, ip);
 796
 797                         /* peer passive ips are kept up to date */
 798                         LASSERT(best_iface != NULL);
 799                 } else {
 800                         /* choose a new interface */
 801                         LASSERT (i == peer->ksnp_n_passive_ips);
 802
 803                         best_iface = NULL;
 804                         best_netmatch = 0;
 805                         best_npeers = 0;
 806
 807                         for (j = 0; j < net->ksnn_ninterfaces; j++) {
 808                                 iface = &net->ksnn_interfaces[j];
 809                                 ip = iface->ksni_ipaddr;
 810
 811                                 for (k = 0; k < peer->ksnp_n_passive_ips; k++)
 812                                         if (peer->ksnp_passive_ips[k] == ip)
 813                                                 break;
 814
 815                                 if (k < peer->ksnp_n_passive_ips) /* using it already */
 816                                         continue;
 817
 818                                 k = ksocknal_match_peerip(iface, peerips, n_peerips);
 819                                 xor = (ip ^ peerips[k]);
 820                                 this_netmatch = ((xor & iface->ksni_netmask) == 0) ? 1 : 0;
 821
 822                                 if (!(best_iface == NULL ||
 823                                       best_netmatch < this_netmatch ||
 824                                       (best_netmatch == this_netmatch &&
 825                                        best_npeers > iface->ksni_npeers)))
 826                                         continue;
 827
 828                                 best_iface = iface;
 829                                 best_netmatch = this_netmatch;
 830                                 best_npeers = iface->ksni_npeers;
 831                         }
 832
 833                         LASSERT(best_iface != NULL);
 834
 835                         best_iface->ksni_npeers++;
 836                         ip = best_iface->ksni_ipaddr;
 837                         peer->ksnp_passive_ips[i] = ip;
 838                         peer->ksnp_n_passive_ips = i+1;
 839                 }
 840
 841                 /* mark the best matching peer IP used */
 842                 j = ksocknal_match_peerip(best_iface, peerips, n_peerips);
 843                 peerips[j] = 0;
 844         }
 845
 846         /* Overwrite input peer IP addresses */
 847         memcpy(peerips, peer->ksnp_passive_ips, n_ips * sizeof(*peerips));
 848
 849         write_unlock_bh(global_lock);
 850
 851         return (n_ips);
 852 }
 853
 854 static void
 855 ksocknal_create_routes(ksock_peer_t *peer, int port,
 856                        __u32 *peer_ipaddrs, int npeer_ipaddrs)
 857 {
 858         ksock_route_t           *newroute = NULL;
 859         rwlock_t                *global_lock = &ksocknal_data.ksnd_global_lock;
 860         lnet_ni_t               *ni = peer->ksnp_ni;
 861         ksock_net_t             *net = ni->ni_data;
 862         struct list_head        *rtmp;
 863         ksock_route_t           *route;
 864         ksock_interface_t       *iface;
 865         ksock_interface_t       *best_iface;
 866         int                     best_netmatch;
 867         int                     this_netmatch;
 868         int                     best_nroutes;
 869         int                     i;
 870         int                     j;
 871
 872         /* CAVEAT EMPTOR: We do all our interface matching with an
 873          * exclusive hold of global lock at IRQ priority.  We're only
 874          * expecting to be dealing with small numbers of interfaces, so the
 875          * O(n**3)-ness here shouldn't matter */
 876
 877         write_lock_bh(global_lock);
 878
 879         if (net->ksnn_ninterfaces < 2) {
 880                 /* Only create additional connections
 881                  * if I have > 1 interface */
 882                 write_unlock_bh(global_lock);
 883                 return;
 884         }
 885
 886         LASSERT (npeer_ipaddrs <= LNET_MAX_INTERFACES);
 887
 888         for (i = 0; i < npeer_ipaddrs; i++) {
 889                 if (newroute != NULL) {
 890                         newroute->ksnr_ipaddr = peer_ipaddrs[i];
 891                 } else {
 892                         write_unlock_bh(global_lock);
 893
 894                         newroute = ksocknal_create_route(peer_ipaddrs[i], port);
 895                         if (newroute == NULL)
 896                                 return;
 897
 898                         write_lock_bh(global_lock);
 899                 }
 900
 901                 if (peer->ksnp_closing) {
 902                         /* peer got closed under me */
 903                         break;
 904                 }
 905
 906                 /* Already got a route? */
 907                 route = NULL;
 908                 list_for_each(rtmp, &peer->ksnp_routes) {
 909                         route = list_entry(rtmp, ksock_route_t, ksnr_list);
 910
 911                         if (route->ksnr_ipaddr == newroute->ksnr_ipaddr)
 912                                 break;
 913
 914                         route = NULL;
 915                 }
 916                 if (route != NULL)
 917                         continue;
 918
 919                 best_iface = NULL;
 920                 best_nroutes = 0;
 921                 best_netmatch = 0;
 922
 923                 LASSERT(net->ksnn_ninterfaces <= LNET_MAX_INTERFACES);
 924
 925                 /* Select interface to connect from */
 926                 for (j = 0; j < net->ksnn_ninterfaces; j++) {
 927                         iface = &net->ksnn_interfaces[j];
 928
 929                         /* Using this interface already? */
 930                         list_for_each(rtmp, &peer->ksnp_routes) {
 931                                 route = list_entry(rtmp, ksock_route_t,
 932                                                    ksnr_list);
 933
 934                                 if (route->ksnr_myipaddr == iface->ksni_ipaddr)
 935                                         break;
 936
 937                                 route = NULL;
 938                         }
 939                         if (route != NULL)
 940                                 continue;
 941
 942                         this_netmatch = (((iface->ksni_ipaddr ^
 943                                            newroute->ksnr_ipaddr) &
 944                                            iface->ksni_netmask) == 0) ? 1 : 0;
 945
 946                         if (!(best_iface == NULL ||
 947                               best_netmatch < this_netmatch ||
 948                               (best_netmatch == this_netmatch &&
 949                                best_nroutes > iface->ksni_nroutes)))
 950                                 continue;
 951
 952                         best_iface = iface;
 953                         best_netmatch = this_netmatch;
 954                         best_nroutes = iface->ksni_nroutes;
 955                 }
 956
 957                 if (best_iface == NULL)
 958                         continue;
 959
 960                 newroute->ksnr_myipaddr = best_iface->ksni_ipaddr;
 961                 best_iface->ksni_nroutes++;
 962
 963                 ksocknal_add_route_locked(peer, newroute);
 964                 newroute = NULL;
 965         }
 966
 967         write_unlock_bh(global_lock);
 968         if (newroute != NULL)
 969                 ksocknal_route_decref(newroute);
 970 }
 971
 972 int
 973 ksocknal_accept(lnet_ni_t *ni, struct socket *sock)
 974 {
 975         ksock_connreq_t *cr;
 976         int              rc;
 977         __u32            peer_ip;
 978         int              peer_port;
 979
 980         rc = lnet_sock_getaddr(sock, true, &peer_ip, &peer_port);
 981         LASSERT(rc == 0);               /* we succeeded before */
 982
 983         LIBCFS_ALLOC(cr, sizeof(*cr));
 984         if (cr == NULL) {
 985                 LCONSOLE_ERROR_MSG(0x12f, "Dropping connection request from "
 986                                    "%pI4h: memory exhausted\n", &peer_ip);
 987                 return -ENOMEM;
 988         }
 989
 990         lnet_ni_addref(ni);
 991         cr->ksncr_ni   = ni;
 992         cr->ksncr_sock = sock;
 993
 994         spin_lock_bh(&ksocknal_data.ksnd_connd_lock);
 995
 996         list_add_tail(&cr->ksncr_list, &ksocknal_data.ksnd_connd_connreqs);
 997         wake_up(&ksocknal_data.ksnd_connd_waitq);
 998
 999         spin_unlock_bh(&ksocknal_data.ksnd_connd_lock);
1000         return 0;
1001 }
1002
1003 static int
1004 ksocknal_connecting (ksock_peer_t *peer, __u32 ipaddr)
1005 {
1006         ksock_route_t *route;
1007
1008         list_for_each_entry(route, &peer->ksnp_routes, ksnr_list) {
1009                 if (route->ksnr_ipaddr == ipaddr)
1010                         return route->ksnr_connecting;
1011         }
1012         return 0;
1013 }
1014
1015 int
1016 ksocknal_create_conn(lnet_ni_t *ni, ksock_route_t *route,
1017                      struct socket *sock, int type)
1018 {
1019         rwlock_t                *global_lock = &ksocknal_data.ksnd_global_lock;
1020         struct list_head        zombies = LIST_HEAD_INIT(zombies);
1021         lnet_process_id_t       peerid;
1022         struct list_head        *tmp;
1023         __u64              incarnation;
1024         ksock_conn_t      *conn;
1025         ksock_conn_t      *conn2;
1026         ksock_peer_t      *peer = NULL;
1027         ksock_peer_t      *peer2;
1028         ksock_sched_t     *sched;
1029         ksock_hello_msg_t *hello;
1030         int                cpt;
1031         ksock_tx_t        *tx;
1032         ksock_tx_t        *txtmp;
1033         int                rc;
1034         int                active;
1035         char              *warn = NULL;
1036
1037         active = (route != NULL);
1038
1039         LASSERT (active == (type != SOCKLND_CONN_NONE));
1040
1041         LIBCFS_ALLOC(conn, sizeof(*conn));
1042         if (conn == NULL) {
1043                 rc = -ENOMEM;
1044                 goto failed_0;
1045         }
1046
1047         memset (conn, 0, sizeof (*conn));
1048
1049         conn->ksnc_peer = NULL;
1050         conn->ksnc_route = NULL;
1051         conn->ksnc_sock = sock;
1052         /* 2 ref, 1 for conn, another extra ref prevents socket
1053          * being closed before establishment of connection */
1054         atomic_set (&conn->ksnc_sock_refcount, 2);
1055         conn->ksnc_type = type;
1056         ksocknal_lib_save_callback(sock, conn);
1057         atomic_set (&conn->ksnc_conn_refcount, 1); /* 1 ref for me */
1058
1059         conn->ksnc_rx_ready = 0;
1060         conn->ksnc_rx_scheduled = 0;
1061
1062         INIT_LIST_HEAD(&conn->ksnc_tx_queue);
1063         conn->ksnc_tx_ready = 0;
1064         conn->ksnc_tx_scheduled = 0;
1065         conn->ksnc_tx_carrier = NULL;
1066         atomic_set (&conn->ksnc_tx_nob, 0);
1067
1068         LIBCFS_ALLOC(hello, offsetof(ksock_hello_msg_t,
1069                                      kshm_ips[LNET_MAX_INTERFACES]));
1070         if (hello == NULL) {
1071                 rc = -ENOMEM;
1072                 goto failed_1;
1073         }
1074
1075         /* stash conn's local and remote addrs */
1076         rc = ksocknal_lib_get_conn_addrs (conn);
1077         if (rc != 0)
1078                 goto failed_1;
1079
1080         /* Find out/confirm peer's NID and connection type and get the
1081          * vector of interfaces she's willing to let me connect to.
1082          * Passive connections use the listener timeout since the peer sends
1083          * eagerly */
1084
1085         if (active) {
1086                 peer = route->ksnr_peer;
1087                 LASSERT(ni == peer->ksnp_ni);
1088
1089                 /* Active connection sends HELLO eagerly */
1090                 hello->kshm_nips = ksocknal_local_ipvec(ni, hello->kshm_ips);
1091                 peerid = peer->ksnp_id;
1092
1093                 write_lock_bh(global_lock);
1094                 conn->ksnc_proto = peer->ksnp_proto;
1095                 write_unlock_bh(global_lock);
1096
1097                 if (conn->ksnc_proto == NULL) {
1098                          conn->ksnc_proto = &ksocknal_protocol_v3x;
1099 #if SOCKNAL_VERSION_DEBUG
1100                          if (*ksocknal_tunables.ksnd_protocol == 2)
1101                                  conn->ksnc_proto = &ksocknal_protocol_v2x;
1102                          else if (*ksocknal_tunables.ksnd_protocol == 1)
1103                                  conn->ksnc_proto = &ksocknal_protocol_v1x;
1104 #endif
1105                 }
1106
1107                 rc = ksocknal_send_hello (ni, conn, peerid.nid, hello);
1108                 if (rc != 0)
1109                         goto failed_1;
1110         } else {
1111                 peerid.nid = LNET_NID_ANY;
1112                 peerid.pid = LNET_PID_ANY;
1113
1114                 /* Passive, get protocol from peer */
1115                 conn->ksnc_proto = NULL;
1116         }
1117
1118         rc = ksocknal_recv_hello (ni, conn, hello, &peerid, &incarnation);
1119         if (rc < 0)
1120                 goto failed_1;
1121
1122         LASSERT (rc == 0 || active);
1123         LASSERT (conn->ksnc_proto != NULL);
1124         LASSERT (peerid.nid != LNET_NID_ANY);
1125
1126         cpt = lnet_cpt_of_nid(peerid.nid);
1127
1128         if (active) {
1129                 ksocknal_peer_addref(peer);
1130                 write_lock_bh(global_lock);
1131         } else {
1132                 rc = ksocknal_create_peer(&peer, ni, peerid);
1133                 if (rc != 0)
1134                         goto failed_1;
1135
1136                 write_lock_bh(global_lock);
1137
1138                 /* called with a ref on ni, so shutdown can't have started */
1139                 LASSERT (((ksock_net_t *) ni->ni_data)->ksnn_shutdown == 0);
1140
1141                 peer2 = ksocknal_find_peer_locked(ni, peerid);
1142                 if (peer2 == NULL) {
1143                         /* NB this puts an "empty" peer in the peer
1144                          * table (which takes my ref) */
1145                         list_add_tail(&peer->ksnp_list,
1146                                       ksocknal_nid2peerlist(peerid.nid));
1147                 } else {
1148                         ksocknal_peer_decref(peer);
1149                         peer = peer2;
1150                 }
1151
1152                 /* +1 ref for me */
1153                 ksocknal_peer_addref(peer);
1154                 peer->ksnp_accepting++;
1155
1156                 /* Am I already connecting to this guy?  Resolve in
1157                  * favour of higher NID... */
1158                 if (peerid.nid < ni->ni_nid &&
1159                     ksocknal_connecting(peer, conn->ksnc_ipaddr)) {
1160                         rc = EALREADY;
1161                         warn = "connection race resolution";
1162                         goto failed_2;
1163                 }
1164         }
1165
1166         if (peer->ksnp_closing ||
1167             (active && route->ksnr_deleted)) {
1168                 /* peer/route got closed under me */
1169                 rc = -ESTALE;
1170                 warn = "peer/route removed";
1171                 goto failed_2;
1172         }
1173
1174         if (peer->ksnp_proto == NULL) {
1175                 /* Never connected before.
1176                  * NB recv_hello may have returned EPROTO to signal my peer
1177                  * wants a different protocol than the one I asked for.
1178                  */
1179                 LASSERT(list_empty(&peer->ksnp_conns));
1180
1181                 peer->ksnp_proto = conn->ksnc_proto;
1182                 peer->ksnp_incarnation = incarnation;
1183         }
1184
1185         if (peer->ksnp_proto != conn->ksnc_proto ||
1186             peer->ksnp_incarnation != incarnation) {
1187                 /* Peer rebooted or I've got the wrong protocol version */
1188                 ksocknal_close_peer_conns_locked(peer, 0, 0);
1189
1190                 peer->ksnp_proto = NULL;
1191                 rc = ESTALE;
1192                 warn = peer->ksnp_incarnation != incarnation ?
1193                        "peer rebooted" :
1194                        "wrong proto version";
1195                 goto failed_2;
1196         }
1197
1198         switch (rc) {
1199         default:
1200                 LBUG();
1201         case 0:
1202                 break;
1203         case EALREADY:
1204                 warn = "lost conn race";
1205                 goto failed_2;
1206         case EPROTO:
1207                 warn = "retry with different protocol version";
1208                 goto failed_2;
1209         }
1210
1211         /* Refuse to duplicate an existing connection, unless this is a
1212          * loopback connection */
1213         if (conn->ksnc_ipaddr != conn->ksnc_myipaddr) {
1214                 list_for_each(tmp, &peer->ksnp_conns) {
1215                         conn2 = list_entry(tmp, ksock_conn_t, ksnc_list);
1216
1217                         if (conn2->ksnc_ipaddr != conn->ksnc_ipaddr ||
1218                             conn2->ksnc_myipaddr != conn->ksnc_myipaddr ||
1219                             conn2->ksnc_type != conn->ksnc_type)
1220                                 continue;
1221
1222                         /* Reply on a passive connection attempt so the peer
1223                          * realises we're connected. */
1224                         LASSERT (rc == 0);
1225                         if (!active)
1226                                 rc = EALREADY;
1227
1228                         warn = "duplicate";
1229                         goto failed_2;
1230                 }
1231         }
1232
1233         /* If the connection created by this route didn't bind to the IP
1234          * address the route connected to, the connection/route matching
1235          * code below probably isn't going to work. */
1236         if (active &&
1237             route->ksnr_ipaddr != conn->ksnc_ipaddr) {
1238                 CERROR("Route %s %pI4h connected to %pI4h\n",
1239                        libcfs_id2str(peer->ksnp_id),
1240                        &route->ksnr_ipaddr,
1241                        &conn->ksnc_ipaddr);
1242         }
1243
1244         /* Search for a route corresponding to the new connection and
1245          * create an association.  This allows incoming connections created
1246          * by routes in my peer to match my own route entries so I don't
1247          * continually create duplicate routes. */
1248         list_for_each(tmp, &peer->ksnp_routes) {
1249                 route = list_entry(tmp, ksock_route_t, ksnr_list);
1250
1251                 if (route->ksnr_ipaddr != conn->ksnc_ipaddr)
1252                         continue;
1253
1254                 ksocknal_associate_route_conn_locked(route, conn);
1255                 break;
1256         }
1257
1258         conn->ksnc_peer = peer;                 /* conn takes my ref on peer */
1259         peer->ksnp_last_alive = cfs_time_current();
1260         peer->ksnp_send_keepalive = 0;
1261         peer->ksnp_error = 0;
1262
1263         sched = ksocknal_choose_scheduler_locked(cpt);
1264         sched->kss_nconns++;
1265         conn->ksnc_scheduler = sched;
1266
1267         conn->ksnc_tx_last_post = cfs_time_current();
1268         /* Set the deadline for the outgoing HELLO to drain */
1269         conn->ksnc_tx_bufnob = sock->sk->sk_wmem_queued;
1270         conn->ksnc_tx_deadline = cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
1271         smp_mb();   /* order with adding to peer's conn list */
1272
1273         list_add(&conn->ksnc_list, &peer->ksnp_conns);
1274         ksocknal_conn_addref(conn);
1275
1276         ksocknal_new_packet(conn, 0);
1277
1278         conn->ksnc_zc_capable = ksocknal_lib_zc_capable(conn);
1279
1280         /* Take packets blocking for this connection. */
1281         list_for_each_entry_safe(tx, txtmp, &peer->ksnp_tx_queue, tx_list) {
1282                 if (conn->ksnc_proto->pro_match_tx(conn, tx, tx->tx_nonblk) ==
1283                     SOCKNAL_MATCH_NO)
1284                         continue;
1285
1286                 list_del(&tx->tx_list);
1287                 ksocknal_queue_tx_locked(tx, conn);
1288         }
1289
1290         write_unlock_bh(global_lock);
1291
1292         /* We've now got a new connection.  Any errors from here on are just
1293          * like "normal" comms errors and we close the connection normally.
1294          * NB (a) we still have to send the reply HELLO for passive
1295          *        connections,
1296          *    (b) normal I/O on the conn is blocked until I setup and call the
1297          *        socket callbacks.
1298          */
1299
1300         CDEBUG(D_NET, "New conn %s p %d.x %pI4h -> %pI4h/%d"
1301                " incarnation:%lld sched[%d:%d]\n",
1302                libcfs_id2str(peerid), conn->ksnc_proto->pro_version,
1303                &conn->ksnc_myipaddr, &conn->ksnc_ipaddr,
1304                conn->ksnc_port, incarnation, cpt,
1305                (int)(sched - &sched->kss_info->ksi_scheds[0]));
1306
1307         if (active) {
1308                 /* additional routes after interface exchange? */
1309                 ksocknal_create_routes(peer, conn->ksnc_port,
1310                                        hello->kshm_ips, hello->kshm_nips);
1311         } else {
1312                 hello->kshm_nips = ksocknal_select_ips(peer, hello->kshm_ips,
1313                                                        hello->kshm_nips);
1314                 rc = ksocknal_send_hello(ni, conn, peerid.nid, hello);
1315         }
1316
1317         LIBCFS_FREE(hello, offsetof(ksock_hello_msg_t,
1318                                     kshm_ips[LNET_MAX_INTERFACES]));
1319
1320         /* setup the socket AFTER I've received hello (it disables
1321          * SO_LINGER).  I might call back to the acceptor who may want
1322          * to send a protocol version response and then close the
1323          * socket; this ensures the socket only tears down after the
1324          * response has been sent. */
1325         if (rc == 0)
1326                 rc = ksocknal_lib_setup_sock(sock);
1327
1328         write_lock_bh(global_lock);
1329
1330         /* NB my callbacks block while I hold ksnd_global_lock */
1331         ksocknal_lib_set_callback(sock, conn);
1332
1333         if (!active)
1334                 peer->ksnp_accepting--;
1335
1336         write_unlock_bh(global_lock);
1337
1338         if (rc != 0) {
1339                 write_lock_bh(global_lock);
1340                 if (!conn->ksnc_closing) {
1341                         /* could be closed by another thread */
1342                         ksocknal_close_conn_locked(conn, rc);
1343                 }
1344                 write_unlock_bh(global_lock);
1345         } else if (ksocknal_connsock_addref(conn) == 0) {
1346                 /* Allow I/O to proceed. */
1347                 ksocknal_read_callback(conn);
1348                 ksocknal_write_callback(conn);
1349                 ksocknal_connsock_decref(conn);
1350         }
1351
1352         ksocknal_connsock_decref(conn);
1353         ksocknal_conn_decref(conn);
1354         return rc;
1355
1356 failed_2:
1357         if (!peer->ksnp_closing &&
1358             list_empty(&peer->ksnp_conns) &&
1359             list_empty(&peer->ksnp_routes)) {
1360                 list_add(&zombies, &peer->ksnp_tx_queue);
1361                 list_del_init(&peer->ksnp_tx_queue);
1362                 ksocknal_unlink_peer_locked(peer);
1363         }
1364
1365         write_unlock_bh(global_lock);
1366
1367         if (warn != NULL) {
1368                 if (rc < 0)
1369                         CERROR("Not creating conn %s type %d: %s\n",
1370                                libcfs_id2str(peerid), conn->ksnc_type, warn);
1371                 else
1372                         CDEBUG(D_NET, "Not creating conn %s type %d: %s\n",
1373                               libcfs_id2str(peerid), conn->ksnc_type, warn);
1374         }
1375
1376         if (!active) {
1377                 if (rc > 0) {
1378                         /* Request retry by replying with CONN_NONE
1379                          * ksnc_proto has been set already */
1380                         conn->ksnc_type = SOCKLND_CONN_NONE;
1381                         hello->kshm_nips = 0;
1382                         ksocknal_send_hello(ni, conn, peerid.nid, hello);
1383                 }
1384
1385                 write_lock_bh(global_lock);
1386                 peer->ksnp_accepting--;
1387                 write_unlock_bh(global_lock);
1388         }
1389
1390         ksocknal_txlist_done(ni, &zombies, 1);
1391         ksocknal_peer_decref(peer);
1392
1393  failed_1:
1394         if (hello != NULL)
1395                 LIBCFS_FREE(hello, offsetof(ksock_hello_msg_t,
1396                                             kshm_ips[LNET_MAX_INTERFACES]));
1397
1398         LIBCFS_FREE(conn, sizeof(*conn));
1399
1400 failed_0:
1401         sock_release(sock);
1402         return rc;
1403 }
1404
1405 void
1406 ksocknal_close_conn_locked (ksock_conn_t *conn, int error)
1407 {
1408         /* This just does the immmediate housekeeping, and queues the
1409          * connection for the reaper to terminate.
1410          * Caller holds ksnd_global_lock exclusively in irq context */
1411         ksock_peer_t      *peer = conn->ksnc_peer;
1412         ksock_route_t     *route;
1413         ksock_conn_t      *conn2;
1414         struct list_head  *tmp;
1415
1416         LASSERT(peer->ksnp_error == 0);
1417         LASSERT(!conn->ksnc_closing);
1418         conn->ksnc_closing = 1;
1419
1420         /* ksnd_deathrow_conns takes over peer's ref */
1421         list_del(&conn->ksnc_list);
1422
1423         route = conn->ksnc_route;
1424         if (route != NULL) {
1425                 /* dissociate conn from route... */
1426                 LASSERT(!route->ksnr_deleted);
1427                 LASSERT((route->ksnr_connected & (1 << conn->ksnc_type)) != 0);
1428
1429                 conn2 = NULL;
1430                 list_for_each(tmp, &peer->ksnp_conns) {
1431                         conn2 = list_entry(tmp, ksock_conn_t, ksnc_list);
1432
1433                         if (conn2->ksnc_route == route &&
1434                             conn2->ksnc_type == conn->ksnc_type)
1435                                 break;
1436
1437                         conn2 = NULL;
1438                 }
1439                 if (conn2 == NULL)
1440                         route->ksnr_connected &= ~(1 << conn->ksnc_type);
1441
1442                 conn->ksnc_route = NULL;
1443
1444 #if 0           /* irrelevent with only eager routes */
1445                 /* make route least favourite */
1446                 list_del(&route->ksnr_list);
1447                 list_add_tail(&route->ksnr_list, &peer->ksnp_routes);
1448 #endif
1449                 ksocknal_route_decref(route);   /* drop conn's ref on route */
1450         }
1451
1452         if (list_empty(&peer->ksnp_conns)) {
1453                 /* No more connections to this peer */
1454
1455                 if (!list_empty(&peer->ksnp_tx_queue)) {
1456                                 ksock_tx_t *tx;
1457
1458                         LASSERT(conn->ksnc_proto == &ksocknal_protocol_v3x);
1459
1460                         /* throw them to the last connection...,
1461                          * these TXs will be send to /dev/null by scheduler */
1462                         list_for_each_entry(tx, &peer->ksnp_tx_queue,
1463                                             tx_list)
1464                                 ksocknal_tx_prep(conn, tx);
1465
1466                         spin_lock_bh(&conn->ksnc_scheduler->kss_lock);
1467                         list_splice_init(&peer->ksnp_tx_queue,
1468                                          &conn->ksnc_tx_queue);
1469                         spin_unlock_bh(&conn->ksnc_scheduler->kss_lock);
1470                 }
1471
1472                 /* renegotiate protocol version */
1473                 peer->ksnp_proto = NULL;
1474                 /* stash last conn close reason */
1475                 peer->ksnp_error = error;
1476
1477                 if (list_empty(&peer->ksnp_routes)) {
1478                         /* I've just closed last conn belonging to a
1479                          * peer with no routes to it */
1480                         ksocknal_unlink_peer_locked(peer);
1481                 }
1482         }
1483
1484         spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
1485
1486         list_add_tail(&conn->ksnc_list,
1487                       &ksocknal_data.ksnd_deathrow_conns);
1488         wake_up(&ksocknal_data.ksnd_reaper_waitq);
1489
1490         spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
1491 }
1492
1493 void
1494 ksocknal_peer_failed (ksock_peer_t *peer)
1495 {
1496         int        notify = 0;
1497         cfs_time_t last_alive = 0;
1498
1499         /* There has been a connection failure or comms error; but I'll only
1500          * tell LNET I think the peer is dead if it's to another kernel and
1501          * there are no connections or connection attempts in existence. */
1502
1503         read_lock(&ksocknal_data.ksnd_global_lock);
1504
1505         if ((peer->ksnp_id.pid & LNET_PID_USERFLAG) == 0 &&
1506              list_empty(&peer->ksnp_conns) &&
1507              peer->ksnp_accepting == 0 &&
1508              ksocknal_find_connecting_route_locked(peer) == NULL) {
1509                 notify = 1;
1510                 last_alive = peer->ksnp_last_alive;
1511         }
1512
1513         read_unlock(&ksocknal_data.ksnd_global_lock);
1514
1515         if (notify)
1516                 lnet_notify(peer->ksnp_ni, peer->ksnp_id.nid, 0,
1517                             last_alive);
1518 }
1519
1520 void
1521 ksocknal_finalize_zcreq(ksock_conn_t *conn)
1522 {
1523         ksock_peer_t     *peer = conn->ksnc_peer;
1524         ksock_tx_t       *tx;
1525         ksock_tx_t       *tmp;
1526         struct list_head  zlist = LIST_HEAD_INIT(zlist);
1527
1528         /* NB safe to finalize TXs because closing of socket will
1529          * abort all buffered data */
1530         LASSERT(conn->ksnc_sock == NULL);
1531
1532         spin_lock(&peer->ksnp_lock);
1533
1534         list_for_each_entry_safe(tx, tmp, &peer->ksnp_zc_req_list, tx_zc_list) {
1535                 if (tx->tx_conn != conn)
1536                         continue;
1537
1538                 LASSERT(tx->tx_msg.ksm_zc_cookies[0] != 0);
1539
1540                 tx->tx_msg.ksm_zc_cookies[0] = 0;
1541                 tx->tx_zc_aborted = 1;  /* mark it as not-acked */
1542                 list_del(&tx->tx_zc_list);
1543                 list_add(&tx->tx_zc_list, &zlist);
1544         }
1545
1546         spin_unlock(&peer->ksnp_lock);
1547
1548         while (!list_empty(&zlist)) {
1549                 tx = list_entry(zlist.next, ksock_tx_t, tx_zc_list);
1550
1551                 list_del(&tx->tx_zc_list);
1552                 ksocknal_tx_decref(tx);
1553         }
1554 }
1555
1556 void
1557 ksocknal_terminate_conn(ksock_conn_t *conn)
1558 {
1559         /* This gets called by the reaper (guaranteed thread context) to
1560          * disengage the socket from its callbacks and close it.
1561          * ksnc_refcount will eventually hit zero, and then the reaper will
1562          * destroy it. */
1563         ksock_peer_t     *peer = conn->ksnc_peer;
1564         ksock_sched_t    *sched = conn->ksnc_scheduler;
1565         int               failed = 0;
1566
1567         LASSERT(conn->ksnc_closing);
1568
1569         /* wake up the scheduler to "send" all remaining packets to /dev/null */
1570         spin_lock_bh(&sched->kss_lock);
1571
1572         /* a closing conn is always ready to tx */
1573         conn->ksnc_tx_ready = 1;
1574
1575         if (!conn->ksnc_tx_scheduled &&
1576             !list_empty(&conn->ksnc_tx_queue)) {
1577                 list_add_tail(&conn->ksnc_tx_list,
1578                                &sched->kss_tx_conns);
1579                 conn->ksnc_tx_scheduled = 1;
1580                 /* extra ref for scheduler */
1581                 ksocknal_conn_addref(conn);
1582
1583                 wake_up (&sched->kss_waitq);
1584         }
1585
1586         spin_unlock_bh(&sched->kss_lock);
1587
1588         /* serialise with callbacks */
1589         write_lock_bh(&ksocknal_data.ksnd_global_lock);
1590
1591         ksocknal_lib_reset_callback(conn->ksnc_sock, conn);
1592
1593         /* OK, so this conn may not be completely disengaged from its
1594          * scheduler yet, but it _has_ committed to terminate... */
1595         conn->ksnc_scheduler->kss_nconns--;
1596
1597         if (peer->ksnp_error != 0) {
1598                 /* peer's last conn closed in error */
1599                 LASSERT(list_empty(&peer->ksnp_conns));
1600                 failed = 1;
1601                 peer->ksnp_error = 0;     /* avoid multiple notifications */
1602         }
1603
1604         write_unlock_bh(&ksocknal_data.ksnd_global_lock);
1605
1606         if (failed)
1607                 ksocknal_peer_failed(peer);
1608
1609         /* The socket is closed on the final put; either here, or in
1610          * ksocknal_{send,recv}msg().  Since we set up the linger2 option
1611          * when the connection was established, this will close the socket
1612          * immediately, aborting anything buffered in it. Any hung
1613          * zero-copy transmits will therefore complete in finite time. */
1614         ksocknal_connsock_decref(conn);
1615 }
1616
1617 void
1618 ksocknal_queue_zombie_conn (ksock_conn_t *conn)
1619 {
1620         /* Queue the conn for the reaper to destroy */
1621
1622         LASSERT(atomic_read(&conn->ksnc_conn_refcount) == 0);
1623         spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
1624
1625         list_add_tail(&conn->ksnc_list, &ksocknal_data.ksnd_zombie_conns);
1626         wake_up(&ksocknal_data.ksnd_reaper_waitq);
1627
1628         spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
1629 }
1630
1631 void
1632 ksocknal_destroy_conn (ksock_conn_t *conn)
1633 {
1634         cfs_time_t      last_rcv;
1635
1636         /* Final coup-de-grace of the reaper */
1637         CDEBUG (D_NET, "connection %p\n", conn);
1638
1639         LASSERT (atomic_read (&conn->ksnc_conn_refcount) == 0);
1640         LASSERT (atomic_read (&conn->ksnc_sock_refcount) == 0);
1641         LASSERT (conn->ksnc_sock == NULL);
1642         LASSERT (conn->ksnc_route == NULL);
1643         LASSERT (!conn->ksnc_tx_scheduled);
1644         LASSERT (!conn->ksnc_rx_scheduled);
1645         LASSERT(list_empty(&conn->ksnc_tx_queue));
1646
1647         /* complete current receive if any */
1648         switch (conn->ksnc_rx_state) {
1649         case SOCKNAL_RX_LNET_PAYLOAD:
1650                 last_rcv = conn->ksnc_rx_deadline -
1651                            cfs_time_seconds(*ksocknal_tunables.ksnd_timeout);
1652                 CERROR("Completing partial receive from %s[%d], "
1653                        "ip %pI4h:%d, with error, wanted: %d, left: %d, "
1654                        "last alive is %ld secs ago\n",
1655                        libcfs_id2str(conn->ksnc_peer->ksnp_id), conn->ksnc_type,
1656                        &conn->ksnc_ipaddr, conn->ksnc_port,
1657                        conn->ksnc_rx_nob_wanted, conn->ksnc_rx_nob_left,
1658                        cfs_duration_sec(cfs_time_sub(cfs_time_current(),
1659                                         last_rcv)));
1660                 lnet_finalize (conn->ksnc_peer->ksnp_ni,
1661                                conn->ksnc_cookie, -EIO);
1662                 break;
1663         case SOCKNAL_RX_LNET_HEADER:
1664                 if (conn->ksnc_rx_started)
1665                         CERROR("Incomplete receive of lnet header from %s, "
1666                                "ip %pI4h:%d, with error, protocol: %d.x.\n",
1667                                libcfs_id2str(conn->ksnc_peer->ksnp_id),
1668                                &conn->ksnc_ipaddr, conn->ksnc_port,
1669                                conn->ksnc_proto->pro_version);
1670                 break;
1671         case SOCKNAL_RX_KSM_HEADER:
1672                 if (conn->ksnc_rx_started)
1673                         CERROR("Incomplete receive of ksock message from %s, "
1674                                "ip %pI4h:%d, with error, protocol: %d.x.\n",
1675                                libcfs_id2str(conn->ksnc_peer->ksnp_id),
1676                                &conn->ksnc_ipaddr, conn->ksnc_port,
1677                                conn->ksnc_proto->pro_version);
1678                 break;
1679         case SOCKNAL_RX_SLOP:
1680                 if (conn->ksnc_rx_started)
1681                         CERROR("Incomplete receive of slops from %s, "
1682                                "ip %pI4h:%d, with error\n",
1683                                libcfs_id2str(conn->ksnc_peer->ksnp_id),
1684                                &conn->ksnc_ipaddr, conn->ksnc_port);
1685                break;
1686         default:
1687                 LBUG ();
1688                 break;
1689         }
1690
1691         ksocknal_peer_decref(conn->ksnc_peer);
1692
1693         LIBCFS_FREE (conn, sizeof (*conn));
1694 }
1695
1696 int
1697 ksocknal_close_peer_conns_locked (ksock_peer_t *peer, __u32 ipaddr, int why)
1698 {
1699         ksock_conn_t       *conn;
1700         struct list_head         *ctmp;
1701         struct list_head         *cnxt;
1702         int                 count = 0;
1703
1704         list_for_each_safe(ctmp, cnxt, &peer->ksnp_conns) {
1705                 conn = list_entry(ctmp, ksock_conn_t, ksnc_list);
1706
1707                 if (ipaddr == 0 ||
1708                     conn->ksnc_ipaddr == ipaddr) {
1709                         count++;
1710                         ksocknal_close_conn_locked (conn, why);
1711                 }
1712         }
1713
1714         return (count);
1715 }
1716
1717 int
1718 ksocknal_close_conn_and_siblings (ksock_conn_t *conn, int why)
1719 {
1720         ksock_peer_t     *peer = conn->ksnc_peer;
1721         __u32             ipaddr = conn->ksnc_ipaddr;
1722         int               count;
1723
1724         write_lock_bh(&ksocknal_data.ksnd_global_lock);
1725
1726         count = ksocknal_close_peer_conns_locked (peer, ipaddr, why);
1727
1728         write_unlock_bh(&ksocknal_data.ksnd_global_lock);
1729
1730         return (count);
1731 }
1732
1733 int
1734 ksocknal_close_matching_conns (lnet_process_id_t id, __u32 ipaddr)
1735 {
1736         ksock_peer_t       *peer;
1737         struct list_head         *ptmp;
1738         struct list_head         *pnxt;
1739         int                 lo;
1740         int                 hi;
1741         int                 i;
1742         int                 count = 0;
1743
1744         write_lock_bh(&ksocknal_data.ksnd_global_lock);
1745
1746         if (id.nid != LNET_NID_ANY)
1747                 lo = hi = (int)(ksocknal_nid2peerlist(id.nid) - ksocknal_data.ksnd_peers);
1748         else {
1749                 lo = 0;
1750                 hi = ksocknal_data.ksnd_peer_hash_size - 1;
1751         }
1752
1753         for (i = lo; i <= hi; i++) {
1754                 list_for_each_safe(ptmp, pnxt, &ksocknal_data.ksnd_peers[i]) {
1755
1756                         peer = list_entry(ptmp, ksock_peer_t, ksnp_list);
1757
1758                         if (!((id.nid == LNET_NID_ANY || id.nid == peer->ksnp_id.nid) &&
1759                               (id.pid == LNET_PID_ANY || id.pid == peer->ksnp_id.pid)))
1760                                 continue;
1761
1762                         count += ksocknal_close_peer_conns_locked (peer, ipaddr, 0);
1763                 }
1764         }
1765
1766         write_unlock_bh(&ksocknal_data.ksnd_global_lock);
1767
1768         /* wildcards always succeed */
1769         if (id.nid == LNET_NID_ANY || id.pid == LNET_PID_ANY || ipaddr == 0)
1770                 return (0);
1771
1772         return (count == 0 ? -ENOENT : 0);
1773 }
1774
1775 void
1776 ksocknal_notify (lnet_ni_t *ni, lnet_nid_t gw_nid, int alive)
1777 {
1778         /* The router is telling me she's been notified of a change in
1779          * gateway state.... */
1780         lnet_process_id_t  id = {0};
1781
1782         id.nid = gw_nid;
1783         id.pid = LNET_PID_ANY;
1784
1785         CDEBUG (D_NET, "gw %s %s\n", libcfs_nid2str(gw_nid),
1786                 alive ? "up" : "down");
1787
1788         if (!alive) {
1789                 /* If the gateway crashed, close all open connections... */
1790                 ksocknal_close_matching_conns (id, 0);
1791                 return;
1792         }
1793
1794         /* ...otherwise do nothing.  We can only establish new connections
1795          * if we have autroutes, and these connect on demand. */
1796 }
1797
1798 void
1799 ksocknal_query (lnet_ni_t *ni, lnet_nid_t nid, cfs_time_t *when)
1800 {
1801         int                connect = 1;
1802         cfs_time_t         last_alive = 0;
1803         cfs_time_t         now = cfs_time_current();
1804         ksock_peer_t      *peer = NULL;
1805         rwlock_t                *glock = &ksocknal_data.ksnd_global_lock;
1806         lnet_process_id_t  id = {
1807                 .nid = nid,
1808                 .pid = LNET_PID_LUSTRE,
1809         };
1810
1811         read_lock(glock);
1812
1813         peer = ksocknal_find_peer_locked(ni, id);
1814         if (peer != NULL) {
1815                 struct list_head       *tmp;
1816                 ksock_conn_t     *conn;
1817                 int               bufnob;
1818
1819                 list_for_each(tmp, &peer->ksnp_conns) {
1820                         conn = list_entry(tmp, ksock_conn_t, ksnc_list);
1821                         bufnob = conn->ksnc_sock->sk->sk_wmem_queued;
1822
1823                         if (bufnob < conn->ksnc_tx_bufnob) {
1824                                 /* something got ACKed */
1825                                 conn->ksnc_tx_deadline =
1826                                         cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
1827                                 peer->ksnp_last_alive = now;
1828                                 conn->ksnc_tx_bufnob = bufnob;
1829                         }
1830                 }
1831
1832                 last_alive = peer->ksnp_last_alive;
1833                 if (ksocknal_find_connectable_route_locked(peer) == NULL)
1834                         connect = 0;
1835         }
1836
1837         read_unlock(glock);
1838
1839         if (last_alive != 0)
1840                 *when = last_alive;
1841
1842         CDEBUG(D_NET, "Peer %s %p, alive %ld secs ago, connect %d\n",
1843                libcfs_nid2str(nid), peer,
1844                last_alive ? cfs_duration_sec(now - last_alive) : -1,
1845                connect);
1846
1847         if (!connect)
1848                 return;
1849
1850         ksocknal_add_peer(ni, id, LNET_NIDADDR(nid), lnet_acceptor_port());
1851
1852         write_lock_bh(glock);
1853
1854         peer = ksocknal_find_peer_locked(ni, id);
1855         if (peer != NULL)
1856                 ksocknal_launch_all_connections_locked(peer);
1857
1858         write_unlock_bh(glock);
1859         return;
1860 }
1861
1862 static void
1863 ksocknal_push_peer (ksock_peer_t *peer)
1864 {
1865         int               index;
1866         int               i;
1867         struct list_head       *tmp;
1868         ksock_conn_t     *conn;
1869
1870         for (index = 0; ; index++) {
1871                 read_lock(&ksocknal_data.ksnd_global_lock);
1872
1873                 i = 0;
1874                 conn = NULL;
1875
1876                 list_for_each(tmp, &peer->ksnp_conns) {
1877                         if (i++ == index) {
1878                                 conn = list_entry(tmp, ksock_conn_t,
1879                                                        ksnc_list);
1880                                 ksocknal_conn_addref(conn);
1881                                 break;
1882                         }
1883                 }
1884
1885                 read_unlock(&ksocknal_data.ksnd_global_lock);
1886
1887                 if (conn == NULL)
1888                         break;
1889
1890                 ksocknal_lib_push_conn (conn);
1891                 ksocknal_conn_decref(conn);
1892         }
1893 }
1894
1895 static int
1896 ksocknal_push (lnet_ni_t *ni, lnet_process_id_t id)
1897 {
1898         struct list_head *start;
1899         struct list_head *end;
1900         struct list_head *tmp;
1901         int               rc = -ENOENT;
1902         unsigned int      hsize = ksocknal_data.ksnd_peer_hash_size;
1903
1904         if (id.nid == LNET_NID_ANY) {
1905                 start = &ksocknal_data.ksnd_peers[0];
1906                 end = &ksocknal_data.ksnd_peers[hsize - 1];
1907         } else {
1908                 start = end = ksocknal_nid2peerlist(id.nid);
1909         }
1910
1911         for (tmp = start; tmp <= end; tmp++) {
1912                 int     peer_off; /* searching offset in peer hash table */
1913
1914                 for (peer_off = 0; ; peer_off++) {
1915                         ksock_peer_t *peer;
1916                         int           i = 0;
1917
1918                         read_lock(&ksocknal_data.ksnd_global_lock);
1919                         list_for_each_entry(peer, tmp, ksnp_list) {
1920                                 if (!((id.nid == LNET_NID_ANY ||
1921                                        id.nid == peer->ksnp_id.nid) &&
1922                                       (id.pid == LNET_PID_ANY ||
1923                                        id.pid == peer->ksnp_id.pid)))
1924                                         continue;
1925
1926                                 if (i++ == peer_off) {
1927                                         ksocknal_peer_addref(peer);
1928                                         break;
1929                                 }
1930                         }
1931                         read_unlock(&ksocknal_data.ksnd_global_lock);
1932
1933                         if (i == 0) /* no match */
1934                                 break;
1935
1936                         rc = 0;
1937                         ksocknal_push_peer(peer);
1938                         ksocknal_peer_decref(peer);
1939                 }
1940         }
1941         return rc;
1942 }
1943
1944 static int
1945 ksocknal_add_interface(lnet_ni_t *ni, __u32 ipaddress, __u32 netmask)
1946 {
1947         ksock_net_t       *net = ni->ni_data;
1948         ksock_interface_t *iface;
1949         int                rc;
1950         int                i;
1951         int                j;
1952         struct list_head        *ptmp;
1953         ksock_peer_t      *peer;
1954         struct list_head        *rtmp;
1955         ksock_route_t     *route;
1956
1957         if (ipaddress == 0 ||
1958             netmask == 0)
1959                 return (-EINVAL);
1960
1961         write_lock_bh(&ksocknal_data.ksnd_global_lock);
1962
1963         iface = ksocknal_ip2iface(ni, ipaddress);
1964         if (iface != NULL) {
1965                 /* silently ignore dups */
1966                 rc = 0;
1967         } else if (net->ksnn_ninterfaces == LNET_MAX_INTERFACES) {
1968                 rc = -ENOSPC;
1969         } else {
1970                 iface = &net->ksnn_interfaces[net->ksnn_ninterfaces++];
1971
1972                 iface->ksni_ipaddr = ipaddress;
1973                 iface->ksni_netmask = netmask;
1974                 iface->ksni_nroutes = 0;
1975                 iface->ksni_npeers = 0;
1976
1977                 for (i = 0; i < ksocknal_data.ksnd_peer_hash_size; i++) {
1978                         list_for_each(ptmp, &ksocknal_data.ksnd_peers[i]) {
1979                                 peer = list_entry(ptmp, ksock_peer_t,
1980                                                       ksnp_list);
1981
1982                                 for (j = 0; j < peer->ksnp_n_passive_ips; j++)
1983                                         if (peer->ksnp_passive_ips[j] == ipaddress)
1984                                                 iface->ksni_npeers++;
1985
1986                                 list_for_each(rtmp, &peer->ksnp_routes) {
1987                                         route = list_entry(rtmp,
1988                                                                ksock_route_t,
1989                                                                ksnr_list);
1990
1991                                         if (route->ksnr_myipaddr == ipaddress)
1992                                                 iface->ksni_nroutes++;
1993                                 }
1994                         }
1995                 }
1996
1997                 rc = 0;
1998                 /* NB only new connections will pay attention to the new interface! */
1999         }
2000
2001         write_unlock_bh(&ksocknal_data.ksnd_global_lock);
2002
2003         return (rc);
2004 }
2005
2006 static void
2007 ksocknal_peer_del_interface_locked(ksock_peer_t *peer, __u32 ipaddr)
2008 {
2009         struct list_head         *tmp;
2010         struct list_head         *nxt;
2011         ksock_route_t      *route;
2012         ksock_conn_t       *conn;
2013         int                 i;
2014         int                 j;
2015
2016         for (i = 0; i < peer->ksnp_n_passive_ips; i++)
2017                 if (peer->ksnp_passive_ips[i] == ipaddr) {
2018                         for (j = i+1; j < peer->ksnp_n_passive_ips; j++)
2019                                 peer->ksnp_passive_ips[j-1] =
2020                                         peer->ksnp_passive_ips[j];
2021                         peer->ksnp_n_passive_ips--;
2022                         break;
2023                 }
2024
2025         list_for_each_safe(tmp, nxt, &peer->ksnp_routes) {
2026                 route = list_entry(tmp, ksock_route_t, ksnr_list);
2027
2028                 if (route->ksnr_myipaddr != ipaddr)
2029                         continue;
2030
2031                 if (route->ksnr_share_count != 0) {
2032                         /* Manually created; keep, but unbind */
2033                         route->ksnr_myipaddr = 0;
2034                 } else {
2035                         ksocknal_del_route_locked(route);
2036                 }
2037         }
2038
2039         list_for_each_safe(tmp, nxt, &peer->ksnp_conns) {
2040                 conn = list_entry(tmp, ksock_conn_t, ksnc_list);
2041
2042                 if (conn->ksnc_myipaddr == ipaddr)
2043                         ksocknal_close_conn_locked (conn, 0);
2044         }
2045 }
2046
2047 static int
2048 ksocknal_del_interface(lnet_ni_t *ni, __u32 ipaddress)
2049 {
2050         ksock_net_t       *net = ni->ni_data;
2051         int                rc = -ENOENT;
2052         struct list_head        *tmp;
2053         struct list_head        *nxt;
2054         ksock_peer_t      *peer;
2055         __u32              this_ip;
2056         int                i;
2057         int                j;
2058
2059         write_lock_bh(&ksocknal_data.ksnd_global_lock);
2060
2061         for (i = 0; i < net->ksnn_ninterfaces; i++) {
2062                 this_ip = net->ksnn_interfaces[i].ksni_ipaddr;
2063
2064                 if (!(ipaddress == 0 ||
2065                       ipaddress == this_ip))
2066                         continue;
2067
2068                 rc = 0;
2069
2070                 for (j = i+1; j < net->ksnn_ninterfaces; j++)
2071                         net->ksnn_interfaces[j-1] =
2072                                 net->ksnn_interfaces[j];
2073
2074                 net->ksnn_ninterfaces--;
2075
2076                 for (j = 0; j < ksocknal_data.ksnd_peer_hash_size; j++) {
2077                         list_for_each_safe(tmp, nxt,
2078                                                &ksocknal_data.ksnd_peers[j]) {
2079                                 peer = list_entry(tmp, ksock_peer_t,
2080                                                       ksnp_list);
2081
2082                                 if (peer->ksnp_ni != ni)
2083                                         continue;
2084
2085                                 ksocknal_peer_del_interface_locked(peer, this_ip);
2086                         }
2087                 }
2088         }
2089
2090         write_unlock_bh(&ksocknal_data.ksnd_global_lock);
2091
2092         return (rc);
2093 }
2094
2095 int
2096 ksocknal_ctl(lnet_ni_t *ni, unsigned int cmd, void *arg)
2097 {
2098         lnet_process_id_t id = {0};
2099         struct libcfs_ioctl_data *data = arg;
2100         int rc;
2101
2102         switch(cmd) {
2103         case IOC_LIBCFS_GET_INTERFACE: {
2104                 ksock_net_t       *net = ni->ni_data;
2105                 ksock_interface_t *iface;
2106
2107                 read_lock(&ksocknal_data.ksnd_global_lock);
2108
2109                 if (data->ioc_count >= (__u32)net->ksnn_ninterfaces) {
2110                         rc = -ENOENT;
2111                 } else {
2112                         rc = 0;
2113                         iface = &net->ksnn_interfaces[data->ioc_count];
2114
2115                         data->ioc_u32[0] = iface->ksni_ipaddr;
2116                         data->ioc_u32[1] = iface->ksni_netmask;
2117                         data->ioc_u32[2] = iface->ksni_npeers;
2118                         data->ioc_u32[3] = iface->ksni_nroutes;
2119                 }
2120
2121                 read_unlock(&ksocknal_data.ksnd_global_lock);
2122                 return rc;
2123         }
2124
2125         case IOC_LIBCFS_ADD_INTERFACE:
2126                 return ksocknal_add_interface(ni,
2127                                               data->ioc_u32[0], /* IP address */
2128                                               data->ioc_u32[1]); /* net mask */
2129
2130         case IOC_LIBCFS_DEL_INTERFACE:
2131                 return ksocknal_del_interface(ni,
2132                                               data->ioc_u32[0]); /* IP address */
2133
2134         case IOC_LIBCFS_GET_PEER: {
2135                 __u32            myip = 0;
2136                 __u32            ip = 0;
2137                 int              port = 0;
2138                 int              conn_count = 0;
2139                 int              share_count = 0;
2140
2141                 rc = ksocknal_get_peer_info(ni, data->ioc_count,
2142                                             &id, &myip, &ip, &port,
2143                                             &conn_count,  &share_count);
2144                 if (rc != 0)
2145                         return rc;
2146
2147                 data->ioc_nid    = id.nid;
2148                 data->ioc_count  = share_count;
2149                 data->ioc_u32[0] = ip;
2150                 data->ioc_u32[1] = port;
2151                 data->ioc_u32[2] = myip;
2152                 data->ioc_u32[3] = conn_count;
2153                 data->ioc_u32[4] = id.pid;
2154                 return 0;
2155         }
2156
2157         case IOC_LIBCFS_ADD_PEER:
2158                 id.nid = data->ioc_nid;
2159                 id.pid = LNET_PID_LUSTRE;
2160                 return ksocknal_add_peer (ni, id,
2161                                           data->ioc_u32[0], /* IP */
2162                                           data->ioc_u32[1]); /* port */
2163
2164         case IOC_LIBCFS_DEL_PEER:
2165                 id.nid = data->ioc_nid;
2166                 id.pid = LNET_PID_ANY;
2167                 return ksocknal_del_peer (ni, id,
2168                                           data->ioc_u32[0]); /* IP */
2169
2170         case IOC_LIBCFS_GET_CONN: {
2171                 int           txmem;
2172                 int           rxmem;
2173                 int           nagle;
2174                 ksock_conn_t *conn = ksocknal_get_conn_by_idx (ni, data->ioc_count);
2175
2176                 if (conn == NULL)
2177                         return -ENOENT;
2178
2179                 ksocknal_lib_get_conn_tunables(conn, &txmem, &rxmem, &nagle);
2180
2181                 data->ioc_count  = txmem;
2182                 data->ioc_nid    = conn->ksnc_peer->ksnp_id.nid;
2183                 data->ioc_flags  = nagle;
2184                 data->ioc_u32[0] = conn->ksnc_ipaddr;
2185                 data->ioc_u32[1] = conn->ksnc_port;
2186                 data->ioc_u32[2] = conn->ksnc_myipaddr;
2187                 data->ioc_u32[3] = conn->ksnc_type;
2188                 data->ioc_u32[4] = conn->ksnc_scheduler->kss_info->ksi_cpt;
2189                 data->ioc_u32[5] = rxmem;
2190                 data->ioc_u32[6] = conn->ksnc_peer->ksnp_id.pid;
2191                 ksocknal_conn_decref(conn);
2192                 return 0;
2193         }
2194
2195         case IOC_LIBCFS_CLOSE_CONNECTION:
2196                 id.nid = data->ioc_nid;
2197                 id.pid = LNET_PID_ANY;
2198                 return ksocknal_close_matching_conns (id,
2199                                                       data->ioc_u32[0]);
2200
2201         case IOC_LIBCFS_REGISTER_MYNID:
2202                 /* Ignore if this is a noop */
2203                 if (data->ioc_nid == ni->ni_nid)
2204                         return 0;
2205
2206                 CERROR("obsolete IOC_LIBCFS_REGISTER_MYNID: %s(%s)\n",
2207                        libcfs_nid2str(data->ioc_nid),
2208                        libcfs_nid2str(ni->ni_nid));
2209                 return -EINVAL;
2210
2211         case IOC_LIBCFS_PUSH_CONNECTION:
2212                 id.nid = data->ioc_nid;
2213                 id.pid = LNET_PID_ANY;
2214                 return ksocknal_push(ni, id);
2215
2216         default:
2217                 return -EINVAL;
2218         }
2219         /* not reached */
2220 }
2221
2222 static void
2223 ksocknal_free_buffers (void)
2224 {
2225         LASSERT (atomic_read(&ksocknal_data.ksnd_nactive_txs) == 0);
2226
2227         if (ksocknal_data.ksnd_sched_info != NULL) {
2228                 struct ksock_sched_info *info;
2229                 int                     i;
2230
2231                 cfs_percpt_for_each(info, i, ksocknal_data.ksnd_sched_info) {
2232                         if (info->ksi_scheds != NULL) {
2233                                 LIBCFS_FREE(info->ksi_scheds,
2234                                             info->ksi_nthreads_max *
2235                                             sizeof(info->ksi_scheds[0]));
2236                         }
2237                 }
2238                 cfs_percpt_free(ksocknal_data.ksnd_sched_info);
2239         }
2240
2241         LIBCFS_FREE (ksocknal_data.ksnd_peers,
2242                      sizeof(struct list_head) *
2243                      ksocknal_data.ksnd_peer_hash_size);
2244
2245         spin_lock(&ksocknal_data.ksnd_tx_lock);
2246
2247         if (!list_empty(&ksocknal_data.ksnd_idle_noop_txs)) {
2248                 struct list_head        zlist;
2249                 ksock_tx_t      *tx;
2250
2251                 list_add(&zlist, &ksocknal_data.ksnd_idle_noop_txs);
2252                 list_del_init(&ksocknal_data.ksnd_idle_noop_txs);
2253                 spin_unlock(&ksocknal_data.ksnd_tx_lock);
2254
2255                 while (!list_empty(&zlist)) {
2256                         tx = list_entry(zlist.next, ksock_tx_t, tx_list);
2257                         list_del(&tx->tx_list);
2258                         LIBCFS_FREE(tx, tx->tx_desc_size);
2259                 }
2260         } else {
2261                 spin_unlock(&ksocknal_data.ksnd_tx_lock);
2262         }
2263 }
2264
2265 static void
2266 ksocknal_base_shutdown(void)
2267 {
2268         struct ksock_sched_info *info;
2269         ksock_sched_t           *sched;
2270         int                     i;
2271         int                     j;
2272
2273         CDEBUG(D_MALLOC, "before NAL cleanup: kmem %d\n",
2274                atomic_read (&libcfs_kmemory));
2275         LASSERT (ksocknal_data.ksnd_nnets == 0);
2276
2277         switch (ksocknal_data.ksnd_init) {
2278         default:
2279                 LASSERT (0);
2280
2281         case SOCKNAL_INIT_ALL:
2282         case SOCKNAL_INIT_DATA:
2283                 LASSERT (ksocknal_data.ksnd_peers != NULL);
2284                 for (i = 0; i < ksocknal_data.ksnd_peer_hash_size; i++) {
2285                         LASSERT(list_empty(&ksocknal_data.ksnd_peers[i]));
2286                 }
2287
2288                 LASSERT(list_empty(&ksocknal_data.ksnd_nets));
2289                 LASSERT(list_empty(&ksocknal_data.ksnd_enomem_conns));
2290                 LASSERT(list_empty(&ksocknal_data.ksnd_zombie_conns));
2291                 LASSERT(list_empty(&ksocknal_data.ksnd_connd_connreqs));
2292                 LASSERT(list_empty(&ksocknal_data.ksnd_connd_routes));
2293
2294                 if (ksocknal_data.ksnd_sched_info != NULL) {
2295                         cfs_percpt_for_each(info, i,
2296                                             ksocknal_data.ksnd_sched_info) {
2297                                 if (info->ksi_scheds == NULL)
2298                                         continue;
2299
2300                                 for (j = 0; j < info->ksi_nthreads_max; j++) {
2301
2302                                         sched = &info->ksi_scheds[j];
2303                                         LASSERT(list_empty(&sched->\
2304                                                                kss_tx_conns));
2305                                         LASSERT(list_empty(&sched->\
2306                                                                kss_rx_conns));
2307                                         LASSERT(list_empty(&sched-> \
2308                                                   kss_zombie_noop_txs));
2309                                         LASSERT(sched->kss_nconns == 0);
2310                                 }
2311                         }
2312                 }
2313
2314                 /* flag threads to terminate; wake and wait for them to die */
2315                 ksocknal_data.ksnd_shuttingdown = 1;
2316                 wake_up_all(&ksocknal_data.ksnd_connd_waitq);
2317                 wake_up_all(&ksocknal_data.ksnd_reaper_waitq);
2318
2319                 if (ksocknal_data.ksnd_sched_info != NULL) {
2320                         cfs_percpt_for_each(info, i,
2321                                             ksocknal_data.ksnd_sched_info) {
2322                                 if (info->ksi_scheds == NULL)
2323                                         continue;
2324
2325                                 for (j = 0; j < info->ksi_nthreads_max; j++) {
2326                                         sched = &info->ksi_scheds[j];
2327                                         wake_up_all(&sched->kss_waitq);
2328                                 }
2329                         }
2330                 }
2331
2332                 i = 4;
2333                 read_lock(&ksocknal_data.ksnd_global_lock);
2334                 while (ksocknal_data.ksnd_nthreads != 0) {
2335                         i++;
2336                         /* power of 2? */
2337                         CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET,
2338                                 "waiting for %d threads to terminate\n",
2339                                 ksocknal_data.ksnd_nthreads);
2340                         read_unlock(&ksocknal_data.ksnd_global_lock);
2341                         set_current_state(TASK_UNINTERRUPTIBLE);
2342                         schedule_timeout(cfs_time_seconds(1));
2343                         read_lock(&ksocknal_data.ksnd_global_lock);
2344                 }
2345                 read_unlock(&ksocknal_data.ksnd_global_lock);
2346
2347                 ksocknal_free_buffers();
2348
2349                 ksocknal_data.ksnd_init = SOCKNAL_INIT_NOTHING;
2350                 break;
2351         }
2352
2353         CDEBUG(D_MALLOC, "after NAL cleanup: kmem %d\n",
2354                atomic_read (&libcfs_kmemory));
2355
2356         module_put(THIS_MODULE);
2357 }
2358
2359 static __u64 ksocknal_new_incarnation(void)
2360 {
2361         struct timeval tv;
2362
2363         /* The incarnation number is the time this module loaded and it
2364          * identifies this particular instance of the socknal.  Hopefully
2365          * we won't be able to reboot more frequently than 1MHz for the
2366          * forseeable future :) */
2367
2368         do_gettimeofday(&tv);
2369
2370         return (((__u64)tv.tv_sec) * 1000000) + tv.tv_usec;
2371 }
2372
2373 static int
2374 ksocknal_base_startup(void)
2375 {
2376         struct ksock_sched_info *info;
2377         int                     rc;
2378         int                     i;
2379
2380         LASSERT (ksocknal_data.ksnd_init == SOCKNAL_INIT_NOTHING);
2381         LASSERT (ksocknal_data.ksnd_nnets == 0);
2382
2383         memset (&ksocknal_data, 0, sizeof (ksocknal_data)); /* zero pointers */
2384
2385         ksocknal_data.ksnd_peer_hash_size = SOCKNAL_PEER_HASH_SIZE;
2386         LIBCFS_ALLOC(ksocknal_data.ksnd_peers,
2387                      sizeof(struct list_head) *
2388                      ksocknal_data.ksnd_peer_hash_size);
2389         if (ksocknal_data.ksnd_peers == NULL)
2390                 return -ENOMEM;
2391
2392         for (i = 0; i < ksocknal_data.ksnd_peer_hash_size; i++)
2393                 INIT_LIST_HEAD(&ksocknal_data.ksnd_peers[i]);
2394
2395         rwlock_init(&ksocknal_data.ksnd_global_lock);
2396         INIT_LIST_HEAD(&ksocknal_data.ksnd_nets);
2397
2398         spin_lock_init(&ksocknal_data.ksnd_reaper_lock);
2399         INIT_LIST_HEAD(&ksocknal_data.ksnd_enomem_conns);
2400         INIT_LIST_HEAD(&ksocknal_data.ksnd_zombie_conns);
2401         INIT_LIST_HEAD(&ksocknal_data.ksnd_deathrow_conns);
2402         init_waitqueue_head(&ksocknal_data.ksnd_reaper_waitq);
2403
2404         spin_lock_init(&ksocknal_data.ksnd_connd_lock);
2405         INIT_LIST_HEAD(&ksocknal_data.ksnd_connd_connreqs);
2406         INIT_LIST_HEAD(&ksocknal_data.ksnd_connd_routes);
2407         init_waitqueue_head(&ksocknal_data.ksnd_connd_waitq);
2408
2409         spin_lock_init(&ksocknal_data.ksnd_tx_lock);
2410         INIT_LIST_HEAD(&ksocknal_data.ksnd_idle_noop_txs);
2411
2412         /* NB memset above zeros whole of ksocknal_data */
2413
2414         /* flag lists/ptrs/locks initialised */
2415         ksocknal_data.ksnd_init = SOCKNAL_INIT_DATA;
2416         try_module_get(THIS_MODULE);
2417
2418         ksocknal_data.ksnd_sched_info = cfs_percpt_alloc(lnet_cpt_table(),
2419                                                          sizeof(*info));
2420         if (ksocknal_data.ksnd_sched_info == NULL)
2421                 goto failed;
2422
2423         cfs_percpt_for_each(info, i, ksocknal_data.ksnd_sched_info) {
2424                 ksock_sched_t   *sched;
2425                 int             nthrs;
2426
2427                 nthrs = cfs_cpt_weight(lnet_cpt_table(), i);
2428                 if (*ksocknal_tunables.ksnd_nscheds > 0) {
2429                         nthrs = min(nthrs, *ksocknal_tunables.ksnd_nscheds);
2430                 } else {
2431                         /* max to half of CPUs, assume another half should be
2432                          * reserved for upper layer modules */
2433                         nthrs = min(max(SOCKNAL_NSCHEDS, nthrs >> 1), nthrs);
2434                 }
2435
2436                 info->ksi_nthreads_max = nthrs;
2437                 info->ksi_cpt = i;
2438
2439                 LIBCFS_CPT_ALLOC(info->ksi_scheds, lnet_cpt_table(), i,
2440                                  info->ksi_nthreads_max * sizeof(*sched));
2441                 if (info->ksi_scheds == NULL)
2442                         goto failed;
2443
2444                 for (; nthrs > 0; nthrs--) {
2445                         sched = &info->ksi_scheds[nthrs - 1];
2446
2447                         sched->kss_info = info;
2448                         spin_lock_init(&sched->kss_lock);
2449                         INIT_LIST_HEAD(&sched->kss_rx_conns);
2450                         INIT_LIST_HEAD(&sched->kss_tx_conns);
2451                         INIT_LIST_HEAD(&sched->kss_zombie_noop_txs);
2452                         init_waitqueue_head(&sched->kss_waitq);
2453                 }
2454         }
2455
2456         ksocknal_data.ksnd_connd_starting         = 0;
2457         ksocknal_data.ksnd_connd_failed_stamp     = 0;
2458         ksocknal_data.ksnd_connd_starting_stamp   = cfs_time_current_sec();
2459         /* must have at least 2 connds to remain responsive to accepts while
2460          * connecting */
2461         if (*ksocknal_tunables.ksnd_nconnds < SOCKNAL_CONND_RESV + 1)
2462                 *ksocknal_tunables.ksnd_nconnds = SOCKNAL_CONND_RESV + 1;
2463
2464         if (*ksocknal_tunables.ksnd_nconnds_max <
2465             *ksocknal_tunables.ksnd_nconnds) {
2466                 ksocknal_tunables.ksnd_nconnds_max =
2467                         ksocknal_tunables.ksnd_nconnds;
2468         }
2469
2470         for (i = 0; i < *ksocknal_tunables.ksnd_nconnds; i++) {
2471                 char name[16];
2472                 spin_lock_bh(&ksocknal_data.ksnd_connd_lock);
2473                 ksocknal_data.ksnd_connd_starting++;
2474                 spin_unlock_bh(&ksocknal_data.ksnd_connd_lock);
2475
2476
2477                 snprintf(name, sizeof(name), "socknal_cd%02d", i);
2478                 rc = ksocknal_thread_start(ksocknal_connd,
2479                                            (void *)((ulong_ptr_t)i), name);
2480                 if (rc != 0) {
2481                         spin_lock_bh(&ksocknal_data.ksnd_connd_lock);
2482                         ksocknal_data.ksnd_connd_starting--;
2483                         spin_unlock_bh(&ksocknal_data.ksnd_connd_lock);
2484                         CERROR("Can't spawn socknal connd: %d\n", rc);
2485                         goto failed;
2486                 }
2487         }
2488
2489         rc = ksocknal_thread_start(ksocknal_reaper, NULL, "socknal_reaper");
2490         if (rc != 0) {
2491                 CERROR ("Can't spawn socknal reaper: %d\n", rc);
2492                 goto failed;
2493         }
2494
2495         /* flag everything initialised */
2496         ksocknal_data.ksnd_init = SOCKNAL_INIT_ALL;
2497
2498         return 0;
2499
2500  failed:
2501         ksocknal_base_shutdown();
2502         return -ENETDOWN;
2503 }
2504
2505 static void
2506 ksocknal_debug_peerhash (lnet_ni_t *ni)
2507 {
2508         ksock_peer_t    *peer = NULL;
2509         struct list_head        *tmp;
2510         int             i;
2511
2512         read_lock(&ksocknal_data.ksnd_global_lock);
2513
2514         for (i = 0; i < ksocknal_data.ksnd_peer_hash_size; i++) {
2515                 list_for_each(tmp, &ksocknal_data.ksnd_peers[i]) {
2516                         peer = list_entry(tmp, ksock_peer_t, ksnp_list);
2517
2518                         if (peer->ksnp_ni == ni) break;
2519
2520                         peer = NULL;
2521                 }
2522         }
2523
2524         if (peer != NULL) {
2525                 ksock_route_t *route;
2526                 ksock_conn_t  *conn;
2527
2528                 CWARN ("Active peer on shutdown: %s, ref %d, scnt %d, "
2529                        "closing %d, accepting %d, err %d, zcookie "LPU64", "
2530                        "txq %d, zc_req %d\n", libcfs_id2str(peer->ksnp_id),
2531                        atomic_read(&peer->ksnp_refcount),
2532                        peer->ksnp_sharecount, peer->ksnp_closing,
2533                        peer->ksnp_accepting, peer->ksnp_error,
2534                        peer->ksnp_zc_next_cookie,
2535                        !list_empty(&peer->ksnp_tx_queue),
2536                        !list_empty(&peer->ksnp_zc_req_list));
2537
2538                 list_for_each(tmp, &peer->ksnp_routes) {
2539                         route = list_entry(tmp, ksock_route_t, ksnr_list);
2540                         CWARN ("Route: ref %d, schd %d, conn %d, cnted %d, "
2541                                "del %d\n", atomic_read(&route->ksnr_refcount),
2542                                route->ksnr_scheduled, route->ksnr_connecting,
2543                                route->ksnr_connected, route->ksnr_deleted);
2544                 }
2545
2546                 list_for_each(tmp, &peer->ksnp_conns) {
2547                         conn = list_entry(tmp, ksock_conn_t, ksnc_list);
2548                         CWARN ("Conn: ref %d, sref %d, t %d, c %d\n",
2549                                atomic_read(&conn->ksnc_conn_refcount),
2550                                atomic_read(&conn->ksnc_sock_refcount),
2551                                conn->ksnc_type, conn->ksnc_closing);
2552                 }
2553         }
2554
2555         read_unlock(&ksocknal_data.ksnd_global_lock);
2556         return;
2557 }
2558
2559 void
2560 ksocknal_shutdown (lnet_ni_t *ni)
2561 {
2562         ksock_net_t      *net = ni->ni_data;
2563         int               i;
2564         lnet_process_id_t anyid = {0};
2565
2566         anyid.nid =  LNET_NID_ANY;
2567         anyid.pid =  LNET_PID_ANY;
2568
2569         LASSERT(ksocknal_data.ksnd_init == SOCKNAL_INIT_ALL);
2570         LASSERT(ksocknal_data.ksnd_nnets > 0);
2571
2572         spin_lock_bh(&net->ksnn_lock);
2573         net->ksnn_shutdown = 1;                 /* prevent new peers */
2574         spin_unlock_bh(&net->ksnn_lock);
2575
2576         /* Delete all peers */
2577         ksocknal_del_peer(ni, anyid, 0);
2578
2579         /* Wait for all peer state to clean up */
2580         i = 2;
2581         spin_lock_bh(&net->ksnn_lock);
2582         while (net->ksnn_npeers != 0) {
2583                 spin_unlock_bh(&net->ksnn_lock);
2584
2585                 i++;
2586                 CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET, /* power of 2? */
2587                        "waiting for %d peers to disconnect\n",
2588                        net->ksnn_npeers);
2589                 set_current_state(TASK_UNINTERRUPTIBLE);
2590                 schedule_timeout(cfs_time_seconds(1));
2591
2592                 ksocknal_debug_peerhash(ni);
2593
2594                 spin_lock_bh(&net->ksnn_lock);
2595         }
2596         spin_unlock_bh(&net->ksnn_lock);
2597
2598         for (i = 0; i < net->ksnn_ninterfaces; i++) {
2599                 LASSERT (net->ksnn_interfaces[i].ksni_npeers == 0);
2600                 LASSERT (net->ksnn_interfaces[i].ksni_nroutes == 0);
2601         }
2602
2603         list_del(&net->ksnn_list);
2604         LIBCFS_FREE(net, sizeof(*net));
2605
2606         ksocknal_data.ksnd_nnets--;
2607         if (ksocknal_data.ksnd_nnets == 0)
2608                 ksocknal_base_shutdown();
2609 }
2610
2611 static int
2612 ksocknal_enumerate_interfaces(ksock_net_t *net)
2613 {
2614         char      **names;
2615         int         i;
2616         int         j;
2617         int         rc;
2618         int         n;
2619
2620         n = lnet_ipif_enumerate(&names);
2621         if (n <= 0) {
2622                 CERROR("Can't enumerate interfaces: %d\n", n);
2623                 return n;
2624         }
2625
2626         for (i = j = 0; i < n; i++) {
2627                 int        up;
2628                 __u32      ip;
2629                 __u32      mask;
2630
2631                 if (!strcmp(names[i], "lo")) /* skip the loopback IF */
2632                         continue;
2633
2634                 rc = lnet_ipif_query(names[i], &up, &ip, &mask);
2635                 if (rc != 0) {
2636                         CWARN("Can't get interface %s info: %d\n",
2637                               names[i], rc);
2638                         continue;
2639                 }
2640
2641                 if (!up) {
2642                         CWARN("Ignoring interface %s (down)\n",
2643                               names[i]);
2644                         continue;
2645                 }
2646
2647                 if (j == LNET_MAX_INTERFACES) {
2648                         CWARN("Ignoring interface %s (too many interfaces)\n",
2649                               names[i]);
2650                         continue;
2651                 }
2652
2653                 net->ksnn_interfaces[j].ksni_ipaddr = ip;
2654                 net->ksnn_interfaces[j].ksni_netmask = mask;
2655                 strlcpy(net->ksnn_interfaces[j].ksni_name,
2656                         names[i], sizeof(net->ksnn_interfaces[j].ksni_name));
2657                 j++;
2658         }
2659
2660         lnet_ipif_free_enumeration(names, n);
2661
2662         if (j == 0)
2663                 CERROR("Can't find any usable interfaces\n");
2664
2665         return j;
2666 }
2667
2668 static int
2669 ksocknal_search_new_ipif(ksock_net_t *net)
2670 {
2671         int     new_ipif = 0;
2672         int     i;
2673
2674         for (i = 0; i < net->ksnn_ninterfaces; i++) {
2675                 char            *ifnam = &net->ksnn_interfaces[i].ksni_name[0];
2676                 char            *colon = strchr(ifnam, ':');
2677                 int             found  = 0;
2678                 ksock_net_t     *tmp;
2679                 int             j;
2680
2681                 if (colon != NULL) /* ignore alias device */
2682                         *colon = 0;
2683
2684                 list_for_each_entry(tmp, &ksocknal_data.ksnd_nets,
2685                                         ksnn_list) {
2686                         for (j = 0; !found && j < tmp->ksnn_ninterfaces; j++) {
2687                                 char *ifnam2 = &tmp->ksnn_interfaces[j].\
2688                                              ksni_name[0];
2689                                 char *colon2 = strchr(ifnam2, ':');
2690
2691                                 if (colon2 != NULL)
2692                                         *colon2 = 0;
2693
2694                                 found = strcmp(ifnam, ifnam2) == 0;
2695                                 if (colon2 != NULL)
2696                                         *colon2 = ':';
2697                         }
2698                         if (found)
2699                                 break;
2700                 }
2701
2702                 new_ipif += !found;
2703                 if (colon != NULL)
2704                         *colon = ':';
2705         }
2706
2707         return new_ipif;
2708 }
2709
2710 static int
2711 ksocknal_start_schedulers(struct ksock_sched_info *info)
2712 {
2713         int     nthrs;
2714         int     rc = 0;
2715         int     i;
2716
2717         if (info->ksi_nthreads == 0) {
2718                 if (*ksocknal_tunables.ksnd_nscheds > 0) {
2719                         nthrs = info->ksi_nthreads_max;
2720                 } else {
2721                         nthrs = cfs_cpt_weight(lnet_cpt_table(),
2722                                                info->ksi_cpt);
2723                         nthrs = min(max(SOCKNAL_NSCHEDS, nthrs >> 1), nthrs);
2724                         nthrs = min(SOCKNAL_NSCHEDS_HIGH, nthrs);
2725                 }
2726                 nthrs = min(nthrs, info->ksi_nthreads_max);
2727         } else {
2728                 LASSERT(info->ksi_nthreads <= info->ksi_nthreads_max);
2729                 /* increase two threads if there is new interface */
2730                 nthrs = min(2, info->ksi_nthreads_max - info->ksi_nthreads);
2731         }
2732
2733         for (i = 0; i < nthrs; i++) {
2734                 long            id;
2735                 char            name[20];
2736                 ksock_sched_t   *sched;
2737                 id = KSOCK_THREAD_ID(info->ksi_cpt, info->ksi_nthreads + i);
2738                 sched = &info->ksi_scheds[KSOCK_THREAD_SID(id)];
2739                 snprintf(name, sizeof(name), "socknal_sd%02d_%02d",
2740                          info->ksi_cpt, (int)(sched - &info->ksi_scheds[0]));
2741
2742                 rc = ksocknal_thread_start(ksocknal_scheduler,
2743                                            (void *)id, name);
2744                 if (rc == 0)
2745                         continue;
2746
2747                 CERROR("Can't spawn thread %d for scheduler[%d]: %d\n",
2748                        info->ksi_cpt, info->ksi_nthreads + i, rc);
2749                 break;
2750         }
2751
2752         info->ksi_nthreads += i;
2753         return rc;
2754 }
2755
2756 static int
2757 ksocknal_net_start_threads(ksock_net_t *net, __u32 *cpts, int ncpts)
2758 {
2759         int     newif = ksocknal_search_new_ipif(net);
2760         int     rc;
2761         int     i;
2762
2763         LASSERT(ncpts > 0 && ncpts <= cfs_cpt_number(lnet_cpt_table()));
2764
2765         for (i = 0; i < ncpts; i++) {
2766                 struct ksock_sched_info *info;
2767                 int cpt = (cpts == NULL) ? i : cpts[i];
2768
2769                 LASSERT(cpt < cfs_cpt_number(lnet_cpt_table()));
2770                 info = ksocknal_data.ksnd_sched_info[cpt];
2771
2772                 if (!newif && info->ksi_nthreads > 0)
2773                         continue;
2774
2775                 rc = ksocknal_start_schedulers(info);
2776                 if (rc != 0)
2777                         return rc;
2778         }
2779         return 0;
2780 }
2781
2782 int
2783 ksocknal_startup (lnet_ni_t *ni)
2784 {
2785         ksock_net_t  *net;
2786         int           rc;
2787         int           i;
2788
2789         LASSERT (ni->ni_lnd == &the_ksocklnd);
2790
2791         if (ksocknal_data.ksnd_init == SOCKNAL_INIT_NOTHING) {
2792                 rc = ksocknal_base_startup();
2793                 if (rc != 0)
2794                         return rc;
2795         }
2796
2797         LIBCFS_ALLOC(net, sizeof(*net));
2798         if (net == NULL)
2799                 goto fail_0;
2800
2801         spin_lock_init(&net->ksnn_lock);
2802         net->ksnn_incarnation = ksocknal_new_incarnation();
2803         ni->ni_data = net;
2804         ni->ni_peertimeout    = *ksocknal_tunables.ksnd_peertimeout;
2805         ni->ni_maxtxcredits   = *ksocknal_tunables.ksnd_credits;
2806         ni->ni_peertxcredits  = *ksocknal_tunables.ksnd_peertxcredits;
2807         ni->ni_peerrtrcredits = *ksocknal_tunables.ksnd_peerrtrcredits;
2808
2809         if (ni->ni_interfaces[0] == NULL) {
2810                 rc = ksocknal_enumerate_interfaces(net);
2811                 if (rc <= 0)
2812                         goto fail_1;
2813
2814                 net->ksnn_ninterfaces = 1;
2815         } else {
2816                 for (i = 0; i < LNET_MAX_INTERFACES; i++) {
2817                         int    up;
2818
2819                         if (ni->ni_interfaces[i] == NULL)
2820                                 break;
2821
2822                         rc = lnet_ipif_query(ni->ni_interfaces[i], &up,
2823                                 &net->ksnn_interfaces[i].ksni_ipaddr,
2824                                 &net->ksnn_interfaces[i].ksni_netmask);
2825
2826                         if (rc != 0) {
2827                                 CERROR("Can't get interface %s info: %d\n",
2828                                        ni->ni_interfaces[i], rc);
2829                                 goto fail_1;
2830                         }
2831
2832                         if (!up) {
2833                                 CERROR("Interface %s is down\n",
2834                                        ni->ni_interfaces[i]);
2835                                 goto fail_1;
2836                         }
2837
2838                         strlcpy(net->ksnn_interfaces[i].ksni_name,
2839                                 ni->ni_interfaces[i],
2840                                 sizeof(net->ksnn_interfaces[i].ksni_name));
2841                 }
2842                 net->ksnn_ninterfaces = i;
2843         }
2844
2845         /* call it before add it to ksocknal_data.ksnd_nets */
2846         rc = ksocknal_net_start_threads(net, ni->ni_cpts, ni->ni_ncpts);
2847         if (rc != 0)
2848                 goto fail_1;
2849
2850         ni->ni_nid = LNET_MKNID(LNET_NIDNET(ni->ni_nid),
2851                                 net->ksnn_interfaces[0].ksni_ipaddr);
2852         list_add(&net->ksnn_list, &ksocknal_data.ksnd_nets);
2853
2854         ksocknal_data.ksnd_nnets++;
2855
2856         return 0;
2857
2858  fail_1:
2859         LIBCFS_FREE(net, sizeof(*net));
2860  fail_0:
2861         if (ksocknal_data.ksnd_nnets == 0)
2862                 ksocknal_base_shutdown();
2863
2864         return -ENETDOWN;
2865 }
2866
2867
2868 static void __exit
2869 ksocknal_module_fini (void)
2870 {
2871         lnet_unregister_lnd(&the_ksocklnd);
2872         ksocknal_tunables_fini();
2873 }
2874
2875 static int __init
2876 ksocknal_module_init (void)
2877 {
2878         int    rc;
2879
2880         /* check ksnr_connected/connecting field large enough */
2881         CLASSERT (SOCKLND_CONN_NTYPES <= 4);
2882         CLASSERT (SOCKLND_CONN_ACK == SOCKLND_CONN_BULK_IN);
2883
2884         /* initialize the_ksocklnd */
2885         the_ksocklnd.lnd_type     = SOCKLND;
2886         the_ksocklnd.lnd_startup  = ksocknal_startup;
2887         the_ksocklnd.lnd_shutdown = ksocknal_shutdown;
2888         the_ksocklnd.lnd_ctl      = ksocknal_ctl;
2889         the_ksocklnd.lnd_send     = ksocknal_send;
2890         the_ksocklnd.lnd_recv     = ksocknal_recv;
2891         the_ksocklnd.lnd_notify   = ksocknal_notify;
2892         the_ksocklnd.lnd_query    = ksocknal_query;
2893         the_ksocklnd.lnd_accept   = ksocknal_accept;
2894
2895         rc = ksocknal_tunables_init();
2896         if (rc != 0)
2897                 return rc;
2898
2899         lnet_register_lnd(&the_ksocklnd);
2900
2901         return 0;
2902 }
2903
2904 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
2905 MODULE_DESCRIPTION("Kernel TCP Socket LND v3.0.0");
2906 MODULE_VERSION("3.0.0");
2907 MODULE_LICENSE("GPL");
2908
2909 module_init(ksocknal_module_init);
2910 module_exit(ksocknal_module_fini);