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