lnet/klnds/socklnd/socklnd.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * GPL HEADER START
   5  *
   6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 only,
  10  * as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License version 2 for more details (a copy is included
  16  * in the LICENSE file that accompanied this code).
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * version 2 along with this program; If not, see
  20  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  21  *
  22  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  23  * CA 95054 USA or visit www.sun.com if you need additional information or
  24  * have any questions.
  25  *
  26  * GPL HEADER END
  27  */
  28 /*
  29  * Copyright  2008 Sun Microsystems, Inc. All rights reserved
  30  * Use is subject to license terms.
  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 lnd_t the_ksocklnd = {
  47         .lnd_type       = SOCKLND,
  48         .lnd_startup    = ksocknal_startup,
  49         .lnd_shutdown   = ksocknal_shutdown,
  50         .lnd_ctl        = ksocknal_ctl,
  51         .lnd_send       = ksocknal_send,
  52         .lnd_recv       = ksocknal_recv,
  53         .lnd_notify     = ksocknal_notify,
  54         .lnd_accept     = ksocknal_accept,
  55 };
  56
  57 ksock_nal_data_t        ksocknal_data;
  58
  59 ksock_interface_t *
  60 ksocknal_ip2iface(lnet_ni_t *ni, __u32 ip)
  61 {
  62         ksock_net_t       *net = ni->ni_data;
  63         int                i;
  64         ksock_interface_t *iface;
  65
  66         for (i = 0; i < net->ksnn_ninterfaces; i++) {
  67                 LASSERT(i < LNET_MAX_INTERFACES);
  68                 iface = &net->ksnn_interfaces[i];
  69
  70                 if (iface->ksni_ipaddr == ip)
  71                         return (iface);
  72         }
  73
  74         return (NULL);
  75 }
  76
  77 ksock_route_t *
  78 ksocknal_create_route (__u32 ipaddr, int port)
  79 {
  80         ksock_route_t *route;
  81
  82         LIBCFS_ALLOC (route, sizeof (*route));
  83         if (route == NULL)
  84                 return (NULL);
  85
  86         atomic_set (&route->ksnr_refcount, 1);
  87         route->ksnr_peer = NULL;
  88         route->ksnr_retry_interval = 0;         /* OK to connect at any time */
  89         route->ksnr_ipaddr = ipaddr;
  90         route->ksnr_port = port;
  91         route->ksnr_scheduled = 0;
  92         route->ksnr_connecting = 0;
  93         route->ksnr_connected = 0;
  94         route->ksnr_deleted = 0;
  95         route->ksnr_conn_count = 0;
  96         route->ksnr_share_count = 0;
  97
  98         return (route);
  99 }
 100
 101 void
 102 ksocknal_destroy_route (ksock_route_t *route)
 103 {
 104         LASSERT (atomic_read(&route->ksnr_refcount) == 0);
 105
 106         if (route->ksnr_peer != NULL)
 107                 ksocknal_peer_decref(route->ksnr_peer);
 108
 109         LIBCFS_FREE (route, sizeof (*route));
 110 }
 111
 112 int
 113 ksocknal_create_peer (ksock_peer_t **peerp, lnet_ni_t *ni, lnet_process_id_t id)
 114 {
 115         ksock_net_t   *net = ni->ni_data;
 116         ksock_peer_t  *peer;
 117
 118         LASSERT (id.nid != LNET_NID_ANY);
 119         LASSERT (id.pid != LNET_PID_ANY);
 120         LASSERT (!in_interrupt());
 121
 122         LIBCFS_ALLOC (peer, sizeof (*peer));
 123         if (peer == NULL)
 124                 return -ENOMEM;
 125
 126         memset (peer, 0, sizeof (*peer));       /* NULL pointers/clear flags etc */
 127
 128         peer->ksnp_ni = ni;
 129         peer->ksnp_id = id;
 130         atomic_set (&peer->ksnp_refcount, 1);   /* 1 ref for caller */
 131         peer->ksnp_closing = 0;
 132         peer->ksnp_accepting = 0;
 133         peer->ksnp_zc_next_cookie = 1;
 134         peer->ksnp_proto = NULL;
 135         CFS_INIT_LIST_HEAD (&peer->ksnp_conns);
 136         CFS_INIT_LIST_HEAD (&peer->ksnp_routes);
 137         CFS_INIT_LIST_HEAD (&peer->ksnp_tx_queue);
 138         CFS_INIT_LIST_HEAD (&peer->ksnp_zc_req_list);
 139         spin_lock_init(&peer->ksnp_lock);
 140
 141         spin_lock_bh (&net->ksnn_lock);
 142
 143         if (net->ksnn_shutdown) {
 144                 spin_unlock_bh (&net->ksnn_lock);
 145
 146                 LIBCFS_FREE(peer, sizeof(*peer));
 147                 CERROR("Can't create peer: network shutdown\n");
 148                 return -ESHUTDOWN;
 149         }
 150
 151         net->ksnn_npeers++;
 152
 153         spin_unlock_bh (&net->ksnn_lock);
 154
 155         *peerp = peer;
 156         return 0;
 157 }
 158
 159 void
 160 ksocknal_destroy_peer (ksock_peer_t *peer)
 161 {
 162         ksock_net_t    *net = peer->ksnp_ni->ni_data;
 163
 164         CDEBUG (D_NET, "peer %s %p deleted\n",
 165                 libcfs_id2str(peer->ksnp_id), peer);
 166
 167         LASSERT (atomic_read (&peer->ksnp_refcount) == 0);
 168         LASSERT (peer->ksnp_accepting == 0);
 169         LASSERT (list_empty (&peer->ksnp_conns));
 170         LASSERT (list_empty (&peer->ksnp_routes));
 171         LASSERT (list_empty (&peer->ksnp_tx_queue));
 172         LASSERT (list_empty (&peer->ksnp_zc_req_list));
 173
 174         LIBCFS_FREE (peer, sizeof (*peer));
 175
 176         /* NB a peer's connections and routes keep a reference on their peer
 177          * until they are destroyed, so we can be assured that _all_ state to
 178          * do with this peer has been cleaned up when its refcount drops to
 179          * zero. */
 180         spin_lock_bh (&net->ksnn_lock);
 181         net->ksnn_npeers--;
 182         spin_unlock_bh (&net->ksnn_lock);
 183 }
 184
 185 ksock_peer_t *
 186 ksocknal_find_peer_locked (lnet_ni_t *ni, lnet_process_id_t id)
 187 {
 188         struct list_head *peer_list = ksocknal_nid2peerlist(id.nid);
 189         struct list_head *tmp;
 190         ksock_peer_t     *peer;
 191
 192         list_for_each (tmp, peer_list) {
 193
 194                 peer = list_entry (tmp, ksock_peer_t, ksnp_list);
 195
 196                 LASSERT (!peer->ksnp_closing);
 197
 198                 if (peer->ksnp_ni != ni)
 199                         continue;
 200
 201                 if (peer->ksnp_id.nid != id.nid ||
 202                     peer->ksnp_id.pid != id.pid)
 203                         continue;
 204
 205                 CDEBUG(D_NET, "got peer [%p] -> %s (%d)\n",
 206                        peer, libcfs_id2str(id),
 207                        atomic_read(&peer->ksnp_refcount));
 208                 return (peer);
 209         }
 210         return (NULL);
 211 }
 212
 213 ksock_peer_t *
 214 ksocknal_find_peer (lnet_ni_t *ni, lnet_process_id_t id)
 215 {
 216         ksock_peer_t     *peer;
 217
 218         read_lock (&ksocknal_data.ksnd_global_lock);
 219         peer = ksocknal_find_peer_locked (ni, id);
 220         if (peer != NULL)                       /* +1 ref for caller? */
 221                 ksocknal_peer_addref(peer);
 222         read_unlock (&ksocknal_data.ksnd_global_lock);
 223
 224         return (peer);
 225 }
 226
 227 void
 228 ksocknal_unlink_peer_locked (ksock_peer_t *peer)
 229 {
 230         int                i;
 231         __u32              ip;
 232         ksock_interface_t *iface;
 233
 234         for (i = 0; i < peer->ksnp_n_passive_ips; i++) {
 235                 LASSERT (i < LNET_MAX_INTERFACES);
 236                 ip = peer->ksnp_passive_ips[i];
 237
 238                 iface = ksocknal_ip2iface(peer->ksnp_ni, ip);
 239                 /* All IPs in peer->ksnp_passive_ips[] come from the
 240                  * interface list, therefore the call must succeed. */
 241                 LASSERT (iface != NULL);
 242
 243                 CDEBUG(D_NET, "peer=%p iface=%p ksni_nroutes=%d\n",
 244                        peer, iface, iface->ksni_nroutes);
 245                 iface->ksni_npeers--;
 246         }
 247
 248         LASSERT (list_empty(&peer->ksnp_conns));
 249         LASSERT (list_empty(&peer->ksnp_routes));
 250         LASSERT (!peer->ksnp_closing);
 251         peer->ksnp_closing = 1;
 252         list_del (&peer->ksnp_list);
 253         /* lose peerlist's ref */
 254         ksocknal_peer_decref(peer);
 255 }
 256
 257 int
 258 ksocknal_get_peer_info (lnet_ni_t *ni, int index,
 259                         lnet_process_id_t *id, __u32 *myip, __u32 *peer_ip, int *port,
 260                         int *conn_count, int *share_count)
 261 {
 262         ksock_peer_t      *peer;
 263         struct list_head  *ptmp;
 264         ksock_route_t     *route;
 265         struct list_head  *rtmp;
 266         int                i;
 267         int                j;
 268         int                rc = -ENOENT;
 269
 270         read_lock (&ksocknal_data.ksnd_global_lock);
 271
 272         for (i = 0; i < ksocknal_data.ksnd_peer_hash_size; i++) {
 273
 274                 list_for_each (ptmp, &ksocknal_data.ksnd_peers[i]) {
 275                         peer = list_entry (ptmp, ksock_peer_t, ksnp_list);
 276
 277                         if (peer->ksnp_ni != ni)
 278                                 continue;
 279
 280                         if (peer->ksnp_n_passive_ips == 0 &&
 281                             list_empty(&peer->ksnp_routes)) {
 282                                 if (index-- > 0)
 283                                         continue;
 284
 285                                 *id = peer->ksnp_id;
 286                                 *myip = 0;
 287                                 *peer_ip = 0;
 288                                 *port = 0;
 289                                 *conn_count = 0;
 290                                 *share_count = 0;
 291                                 rc = 0;
 292                                 goto out;
 293                         }
 294
 295                         for (j = 0; j < peer->ksnp_n_passive_ips; j++) {
 296                                 if (index-- > 0)
 297                                         continue;
 298
 299                                 *id = peer->ksnp_id;
 300                                 *myip = peer->ksnp_passive_ips[j];
 301                                 *peer_ip = 0;
 302                                 *port = 0;
 303                                 *conn_count = 0;
 304                                 *share_count = 0;
 305                                 rc = 0;
 306                                 goto out;
 307                         }
 308
 309                         list_for_each (rtmp, &peer->ksnp_routes) {
 310                                 if (index-- > 0)
 311                                         continue;
 312
 313                                 route = list_entry(rtmp, ksock_route_t,
 314                                                    ksnr_list);
 315
 316                                 *id = peer->ksnp_id;
 317                                 *myip = route->ksnr_myipaddr;
 318                                 *peer_ip = route->ksnr_ipaddr;
 319                                 *port = route->ksnr_port;
 320                                 *conn_count = route->ksnr_conn_count;
 321                                 *share_count = route->ksnr_share_count;
 322                                 rc = 0;
 323                                 goto out;
 324                         }
 325                 }
 326         }
 327  out:
 328         read_unlock (&ksocknal_data.ksnd_global_lock);
 329         return (rc);
 330 }
 331
 332 void
 333 ksocknal_associate_route_conn_locked(ksock_route_t *route, ksock_conn_t *conn)
 334 {
 335         ksock_peer_t      *peer = route->ksnr_peer;
 336         int                type = conn->ksnc_type;
 337         ksock_interface_t *iface;
 338
 339         conn->ksnc_route = route;
 340         ksocknal_route_addref(route);
 341
 342         if (route->ksnr_myipaddr != conn->ksnc_myipaddr) {
 343                 if (route->ksnr_myipaddr == 0) {
 344                         /* route wasn't bound locally yet (the initial route) */
 345                         CDEBUG(D_NET, "Binding %s %u.%u.%u.%u to %u.%u.%u.%u\n",
 346                                libcfs_id2str(peer->ksnp_id),
 347                                HIPQUAD(route->ksnr_ipaddr),
 348                                HIPQUAD(conn->ksnc_myipaddr));
 349                 } else {
 350                         CDEBUG(D_NET, "Rebinding %s %u.%u.%u.%u from "
 351                                "%u.%u.%u.%u to %u.%u.%u.%u\n",
 352                                libcfs_id2str(peer->ksnp_id),
 353                                HIPQUAD(route->ksnr_ipaddr),
 354                                HIPQUAD(route->ksnr_myipaddr),
 355                                HIPQUAD(conn->ksnc_myipaddr));
 356
 357                         iface = ksocknal_ip2iface(route->ksnr_peer->ksnp_ni,
 358                                                   route->ksnr_myipaddr);
 359                         if (iface != NULL)
 360                                 iface->ksni_nroutes--;
 361                 }
 362                 route->ksnr_myipaddr = conn->ksnc_myipaddr;
 363                 iface = ksocknal_ip2iface(route->ksnr_peer->ksnp_ni,
 364                                           route->ksnr_myipaddr);
 365                 if (iface != NULL)
 366                         iface->ksni_nroutes++;
 367         }
 368
 369         route->ksnr_connected |= (1<<type);
 370         route->ksnr_conn_count++;
 371
 372         /* Successful connection => further attempts can
 373          * proceed immediately */
 374         route->ksnr_retry_interval = 0;
 375 }
 376
 377 void
 378 ksocknal_add_route_locked (ksock_peer_t *peer, ksock_route_t *route)
 379 {
 380         struct list_head  *tmp;
 381         ksock_conn_t      *conn;
 382         ksock_route_t     *route2;
 383
 384         LASSERT (!peer->ksnp_closing);
 385         LASSERT (route->ksnr_peer == NULL);
 386         LASSERT (!route->ksnr_scheduled);
 387         LASSERT (!route->ksnr_connecting);
 388         LASSERT (route->ksnr_connected == 0);
 389
 390         /* LASSERT(unique) */
 391         list_for_each(tmp, &peer->ksnp_routes) {
 392                 route2 = list_entry(tmp, ksock_route_t, ksnr_list);
 393
 394                 if (route2->ksnr_ipaddr == route->ksnr_ipaddr) {
 395                         CERROR ("Duplicate route %s %u.%u.%u.%u\n",
 396                                 libcfs_id2str(peer->ksnp_id),
 397                                 HIPQUAD(route->ksnr_ipaddr));
 398                         LBUG();
 399                 }
 400         }
 401
 402         route->ksnr_peer = peer;
 403         ksocknal_peer_addref(peer);
 404         /* peer's routelist takes over my ref on 'route' */
 405         list_add_tail(&route->ksnr_list, &peer->ksnp_routes);
 406
 407         list_for_each(tmp, &peer->ksnp_conns) {
 408                 conn = list_entry(tmp, ksock_conn_t, ksnc_list);
 409
 410                 if (conn->ksnc_ipaddr != route->ksnr_ipaddr)
 411                         continue;
 412
 413                 ksocknal_associate_route_conn_locked(route, conn);
 414                 /* keep going (typed routes) */
 415         }
 416 }
 417
 418 void
 419 ksocknal_del_route_locked (ksock_route_t *route)
 420 {
 421         ksock_peer_t      *peer = route->ksnr_peer;
 422         ksock_interface_t *iface;
 423         ksock_conn_t      *conn;
 424         struct list_head  *ctmp;
 425         struct list_head  *cnxt;
 426
 427         LASSERT (!route->ksnr_deleted);
 428
 429         /* Close associated conns */
 430         list_for_each_safe (ctmp, cnxt, &peer->ksnp_conns) {
 431                 conn = list_entry(ctmp, ksock_conn_t, ksnc_list);
 432
 433                 if (conn->ksnc_route != route)
 434                         continue;
 435
 436                 ksocknal_close_conn_locked (conn, 0);
 437         }
 438
 439         if (route->ksnr_myipaddr != 0) {
 440                 iface = ksocknal_ip2iface(route->ksnr_peer->ksnp_ni,
 441                                           route->ksnr_myipaddr);
 442                 if (iface != NULL)
 443                         iface->ksni_nroutes--;
 444         }
 445
 446         route->ksnr_deleted = 1;
 447         list_del (&route->ksnr_list);
 448         ksocknal_route_decref(route);             /* drop peer's ref */
 449
 450         if (list_empty (&peer->ksnp_routes) &&
 451             list_empty (&peer->ksnp_conns)) {
 452                 /* I've just removed the last route to a peer with no active
 453                  * connections */
 454                 ksocknal_unlink_peer_locked (peer);
 455         }
 456 }
 457
 458 int
 459 ksocknal_add_peer (lnet_ni_t *ni, lnet_process_id_t id, __u32 ipaddr, int port)
 460 {
 461         struct list_head  *tmp;
 462         ksock_peer_t      *peer;
 463         ksock_peer_t      *peer2;
 464         ksock_route_t     *route;
 465         ksock_route_t     *route2;
 466         int                rc;
 467
 468         if (id.nid == LNET_NID_ANY ||
 469             id.pid == LNET_PID_ANY)
 470                 return (-EINVAL);
 471
 472         /* Have a brand new peer ready... */
 473         rc = ksocknal_create_peer(&peer, ni, id);
 474         if (rc != 0)
 475                 return rc;
 476
 477         route = ksocknal_create_route (ipaddr, port);
 478         if (route == NULL) {
 479                 ksocknal_peer_decref(peer);
 480                 return (-ENOMEM);
 481         }
 482
 483         write_lock_bh (&ksocknal_data.ksnd_global_lock);
 484
 485         /* always called with a ref on ni, so shutdown can't have started */
 486         LASSERT (((ksock_net_t *) ni->ni_data)->ksnn_shutdown == 0);
 487
 488         peer2 = ksocknal_find_peer_locked (ni, id);
 489         if (peer2 != NULL) {
 490                 ksocknal_peer_decref(peer);
 491                 peer = peer2;
 492         } else {
 493                 /* peer table takes my ref on peer */
 494                 list_add_tail (&peer->ksnp_list,
 495                                ksocknal_nid2peerlist (id.nid));
 496         }
 497
 498         route2 = NULL;
 499         list_for_each (tmp, &peer->ksnp_routes) {
 500                 route2 = list_entry(tmp, ksock_route_t, ksnr_list);
 501
 502                 if (route2->ksnr_ipaddr == ipaddr)
 503                         break;
 504
 505                 route2 = NULL;
 506         }
 507         if (route2 == NULL) {
 508                 ksocknal_add_route_locked(peer, route);
 509                 route->ksnr_share_count++;
 510         } else {
 511                 ksocknal_route_decref(route);
 512                 route2->ksnr_share_count++;
 513         }
 514
 515         write_unlock_bh (&ksocknal_data.ksnd_global_lock);
 516
 517         return (0);
 518 }
 519
 520 void
 521 ksocknal_del_peer_locked (ksock_peer_t *peer, __u32 ip)
 522 {
 523         ksock_conn_t     *conn;
 524         ksock_route_t    *route;
 525         struct list_head *tmp;
 526         struct list_head *nxt;
 527         int               nshared;
 528
 529         LASSERT (!peer->ksnp_closing);
 530
 531         /* Extra ref prevents peer disappearing until I'm done with it */
 532         ksocknal_peer_addref(peer);
 533
 534         list_for_each_safe (tmp, nxt, &peer->ksnp_routes) {
 535                 route = list_entry(tmp, ksock_route_t, ksnr_list);
 536
 537                 /* no match */
 538                 if (!(ip == 0 || route->ksnr_ipaddr == ip))
 539                         continue;
 540
 541                 route->ksnr_share_count = 0;
 542                 /* This deletes associated conns too */
 543                 ksocknal_del_route_locked (route);
 544         }
 545
 546         nshared = 0;
 547         list_for_each_safe (tmp, nxt, &peer->ksnp_routes) {
 548                 route = list_entry(tmp, ksock_route_t, ksnr_list);
 549                 nshared += route->ksnr_share_count;
 550         }
 551
 552         if (nshared == 0) {
 553                 /* remove everything else if there are no explicit entries
 554                  * left */
 555
 556                 list_for_each_safe (tmp, nxt, &peer->ksnp_routes) {
 557                         route = list_entry(tmp, ksock_route_t, ksnr_list);
 558
 559                         /* we should only be removing auto-entries */
 560                         LASSERT(route->ksnr_share_count == 0);
 561                         ksocknal_del_route_locked (route);
 562                 }
 563
 564                 list_for_each_safe (tmp, nxt, &peer->ksnp_conns) {
 565                         conn = list_entry(tmp, ksock_conn_t, ksnc_list);
 566
 567                         ksocknal_close_conn_locked(conn, 0);
 568                 }
 569         }
 570
 571         ksocknal_peer_decref(peer);
 572         /* NB peer unlinks itself when last conn/route is removed */
 573 }
 574
 575 int
 576 ksocknal_del_peer (lnet_ni_t *ni, lnet_process_id_t id, __u32 ip)
 577 {
 578         CFS_LIST_HEAD     (zombies);
 579         struct list_head  *ptmp;
 580         struct list_head  *pnxt;
 581         ksock_peer_t      *peer;
 582         int                lo;
 583         int                hi;
 584         int                i;
 585         int                rc = -ENOENT;
 586
 587         write_lock_bh (&ksocknal_data.ksnd_global_lock);
 588
 589         if (id.nid != LNET_NID_ANY)
 590                 lo = hi = ksocknal_nid2peerlist(id.nid) - ksocknal_data.ksnd_peers;
 591         else {
 592                 lo = 0;
 593                 hi = ksocknal_data.ksnd_peer_hash_size - 1;
 594         }
 595
 596         for (i = lo; i <= hi; i++) {
 597                 list_for_each_safe (ptmp, pnxt, &ksocknal_data.ksnd_peers[i]) {
 598                         peer = list_entry (ptmp, ksock_peer_t, ksnp_list);
 599
 600                         if (peer->ksnp_ni != ni)
 601                                 continue;
 602
 603                         if (!((id.nid == LNET_NID_ANY || peer->ksnp_id.nid == id.nid) &&
 604                               (id.pid == LNET_PID_ANY || peer->ksnp_id.pid == id.pid)))
 605                                 continue;
 606
 607                         ksocknal_peer_addref(peer);     /* a ref for me... */
 608
 609                         ksocknal_del_peer_locked (peer, ip);
 610
 611                         if (peer->ksnp_closing && !list_empty(&peer->ksnp_tx_queue)) {
 612                                 LASSERT (list_empty(&peer->ksnp_conns));
 613                                 LASSERT (list_empty(&peer->ksnp_routes));
 614
 615                                 list_splice_init(&peer->ksnp_tx_queue, &zombies);
 616                         }
 617
 618                         ksocknal_peer_decref(peer);     /* ...till here */
 619
 620                         rc = 0;                 /* matched! */
 621                 }
 622         }
 623
 624         write_unlock_bh (&ksocknal_data.ksnd_global_lock);
 625
 626         ksocknal_txlist_done(ni, &zombies, 1);
 627
 628         return (rc);
 629 }
 630
 631 ksock_conn_t *
 632 ksocknal_get_conn_by_idx (lnet_ni_t *ni, int index)
 633 {
 634         ksock_peer_t      *peer;
 635         struct list_head  *ptmp;
 636         ksock_conn_t      *conn;
 637         struct list_head  *ctmp;
 638         int                i;
 639
 640         read_lock (&ksocknal_data.ksnd_global_lock);
 641
 642         for (i = 0; i < ksocknal_data.ksnd_peer_hash_size; i++) {
 643                 list_for_each (ptmp, &ksocknal_data.ksnd_peers[i]) {
 644                         peer = list_entry (ptmp, ksock_peer_t, ksnp_list);
 645
 646                         LASSERT (!peer->ksnp_closing);
 647
 648                         if (peer->ksnp_ni != ni)
 649                                 continue;
 650
 651                         list_for_each (ctmp, &peer->ksnp_conns) {
 652                                 if (index-- > 0)
 653                                         continue;
 654
 655                                 conn = list_entry (ctmp, ksock_conn_t, ksnc_list);
 656                                 ksocknal_conn_addref(conn);
 657                                 read_unlock (&ksocknal_data.ksnd_global_lock);
 658                                 return (conn);
 659                         }
 660                 }
 661         }
 662
 663         read_unlock (&ksocknal_data.ksnd_global_lock);
 664         return (NULL);
 665 }
 666
 667 ksock_sched_t *
 668 ksocknal_choose_scheduler_locked (unsigned int irq)
 669 {
 670         ksock_sched_t    *sched;
 671         ksock_irqinfo_t  *info;
 672         int               i;
 673
 674         LASSERT (irq < NR_IRQS);
 675         info = &ksocknal_data.ksnd_irqinfo[irq];
 676
 677         if (irq != 0 &&                         /* hardware NIC */
 678             info->ksni_valid) {                 /* already set up */
 679                 return (&ksocknal_data.ksnd_schedulers[info->ksni_sched]);
 680         }
 681
 682         /* software NIC (irq == 0) || not associated with a scheduler yet.
 683          * Choose the CPU with the fewest connections... */
 684         sched = &ksocknal_data.ksnd_schedulers[0];
 685         for (i = 1; i < ksocknal_data.ksnd_nschedulers; i++)
 686                 if (sched->kss_nconns >
 687                     ksocknal_data.ksnd_schedulers[i].kss_nconns)
 688                         sched = &ksocknal_data.ksnd_schedulers[i];
 689
 690         if (irq != 0) {                         /* Hardware NIC */
 691                 info->ksni_valid = 1;
 692                 info->ksni_sched = sched - ksocknal_data.ksnd_schedulers;
 693
 694                 /* no overflow... */
 695                 LASSERT (info->ksni_sched == sched - ksocknal_data.ksnd_schedulers);
 696         }
 697
 698         return (sched);
 699 }
 700
 701 int
 702 ksocknal_local_ipvec (lnet_ni_t *ni, __u32 *ipaddrs)
 703 {
 704         ksock_net_t       *net = ni->ni_data;
 705         int                i;
 706         int                nip;
 707
 708         read_lock (&ksocknal_data.ksnd_global_lock);
 709
 710         nip = net->ksnn_ninterfaces;
 711         LASSERT (nip <= LNET_MAX_INTERFACES);
 712
 713         /* Only offer interfaces for additional connections if I have
 714          * more than one. */
 715         if (nip < 2) {
 716                 read_unlock (&ksocknal_data.ksnd_global_lock);
 717                 return 0;
 718         }
 719
 720         for (i = 0; i < nip; i++) {
 721                 ipaddrs[i] = net->ksnn_interfaces[i].ksni_ipaddr;
 722                 LASSERT (ipaddrs[i] != 0);
 723         }
 724
 725         read_unlock (&ksocknal_data.ksnd_global_lock);
 726         return (nip);
 727 }
 728
 729 int
 730 ksocknal_match_peerip (ksock_interface_t *iface, __u32 *ips, int nips)
 731 {
 732         int   best_netmatch = 0;
 733         int   best_xor      = 0;
 734         int   best          = -1;
 735         int   this_xor;
 736         int   this_netmatch;
 737         int   i;
 738
 739         for (i = 0; i < nips; i++) {
 740                 if (ips[i] == 0)
 741                         continue;
 742
 743                 this_xor = (ips[i] ^ iface->ksni_ipaddr);
 744                 this_netmatch = ((this_xor & iface->ksni_netmask) == 0) ? 1 : 0;
 745
 746                 if (!(best < 0 ||
 747                       best_netmatch < this_netmatch ||
 748                       (best_netmatch == this_netmatch &&
 749                        best_xor > this_xor)))
 750                         continue;
 751
 752                 best = i;
 753                 best_netmatch = this_netmatch;
 754                 best_xor = this_xor;
 755         }
 756
 757         LASSERT (best >= 0);
 758         return (best);
 759 }
 760
 761 int
 762 ksocknal_select_ips(ksock_peer_t *peer, __u32 *peerips, int n_peerips)
 763 {
 764         rwlock_t           *global_lock = &ksocknal_data.ksnd_global_lock;
 765         ksock_net_t        *net = peer->ksnp_ni->ni_data;
 766         ksock_interface_t  *iface;
 767         ksock_interface_t  *best_iface;
 768         int                 n_ips;
 769         int                 i;
 770         int                 j;
 771         int                 k;
 772         __u32               ip;
 773         __u32               xor;
 774         int                 this_netmatch;
 775         int                 best_netmatch;
 776         int                 best_npeers;
 777
 778         /* CAVEAT EMPTOR: We do all our interface matching with an
 779          * exclusive hold of global lock at IRQ priority.  We're only
 780          * expecting to be dealing with small numbers of interfaces, so the
 781          * O(n**3)-ness shouldn't matter */
 782
 783         /* Also note that I'm not going to return more than n_peerips
 784          * interfaces, even if I have more myself */
 785
 786         write_lock_bh (global_lock);
 787
 788         LASSERT (n_peerips <= LNET_MAX_INTERFACES);
 789         LASSERT (net->ksnn_ninterfaces <= LNET_MAX_INTERFACES);
 790
 791         /* Only match interfaces for additional connections
 792          * if I have > 1 interface */
 793         n_ips = (net->ksnn_ninterfaces < 2) ? 0 :
 794                 MIN(n_peerips, net->ksnn_ninterfaces);
 795
 796         for (i = 0; peer->ksnp_n_passive_ips < n_ips; i++) {
 797                 /*              ^ yes really... */
 798
 799                 /* If we have any new interfaces, first tick off all the
 800                  * peer IPs that match old interfaces, then choose new
 801                  * interfaces to match the remaining peer IPS.
 802                  * We don't forget interfaces we've stopped using; we might
 803                  * start using them again... */
 804
 805                 if (i < peer->ksnp_n_passive_ips) {
 806                         /* Old interface. */
 807                         ip = peer->ksnp_passive_ips[i];
 808                         best_iface = ksocknal_ip2iface(peer->ksnp_ni, ip);
 809
 810                         /* peer passive ips are kept up to date */
 811                         LASSERT(best_iface != NULL);
 812                 } else {
 813                         /* choose a new interface */
 814                         LASSERT (i == peer->ksnp_n_passive_ips);
 815
 816                         best_iface = NULL;
 817                         best_netmatch = 0;
 818                         best_npeers = 0;
 819
 820                         for (j = 0; j < net->ksnn_ninterfaces; j++) {
 821                                 iface = &net->ksnn_interfaces[j];
 822                                 ip = iface->ksni_ipaddr;
 823
 824                                 for (k = 0; k < peer->ksnp_n_passive_ips; k++)
 825                                         if (peer->ksnp_passive_ips[k] == ip)
 826                                                 break;
 827
 828                                 if (k < peer->ksnp_n_passive_ips) /* using it already */
 829                                         continue;
 830
 831                                 k = ksocknal_match_peerip(iface, peerips, n_peerips);
 832                                 xor = (ip ^ peerips[k]);
 833                                 this_netmatch = ((xor & iface->ksni_netmask) == 0) ? 1 : 0;
 834
 835                                 if (!(best_iface == NULL ||
 836                                       best_netmatch < this_netmatch ||
 837                                       (best_netmatch == this_netmatch &&
 838                                        best_npeers > iface->ksni_npeers)))
 839                                         continue;
 840
 841                                 best_iface = iface;
 842                                 best_netmatch = this_netmatch;
 843                                 best_npeers = iface->ksni_npeers;
 844                         }
 845
 846                         best_iface->ksni_npeers++;
 847                         ip = best_iface->ksni_ipaddr;
 848                         peer->ksnp_passive_ips[i] = ip;
 849                         peer->ksnp_n_passive_ips = i+1;
 850                 }
 851
 852                 LASSERT (best_iface != NULL);
 853
 854                 /* mark the best matching peer IP used */
 855                 j = ksocknal_match_peerip(best_iface, peerips, n_peerips);
 856                 peerips[j] = 0;
 857         }
 858
 859         /* Overwrite input peer IP addresses */
 860         memcpy(peerips, peer->ksnp_passive_ips, n_ips * sizeof(*peerips));
 861
 862         write_unlock_bh (global_lock);
 863
 864         return (n_ips);
 865 }
 866
 867 void
 868 ksocknal_create_routes(ksock_peer_t *peer, int port,
 869                        __u32 *peer_ipaddrs, int npeer_ipaddrs)
 870 {
 871         ksock_route_t      *newroute = NULL;
 872         rwlock_t           *global_lock = &ksocknal_data.ksnd_global_lock;
 873         lnet_ni_t          *ni = peer->ksnp_ni;
 874         ksock_net_t        *net = ni->ni_data;
 875         struct list_head   *rtmp;
 876         ksock_route_t      *route;
 877         ksock_interface_t  *iface;
 878         ksock_interface_t  *best_iface;
 879         int                 best_netmatch;
 880         int                 this_netmatch;
 881         int                 best_nroutes;
 882         int                 i;
 883         int                 j;
 884
 885         /* CAVEAT EMPTOR: We do all our interface matching with an
 886          * exclusive hold of global lock at IRQ priority.  We're only
 887          * expecting to be dealing with small numbers of interfaces, so the
 888          * O(n**3)-ness here shouldn't matter */
 889
 890         write_lock_bh (global_lock);
 891
 892         if (net->ksnn_ninterfaces < 2) {
 893                 /* Only create additional connections
 894                  * if I have > 1 interface */
 895                 write_unlock_bh (global_lock);
 896                 return;
 897         }
 898
 899         LASSERT (npeer_ipaddrs <= LNET_MAX_INTERFACES);
 900
 901         for (i = 0; i < npeer_ipaddrs; i++) {
 902                 if (newroute != NULL) {
 903                         newroute->ksnr_ipaddr = peer_ipaddrs[i];
 904                 } else {
 905                         write_unlock_bh (global_lock);
 906
 907                         newroute = ksocknal_create_route(peer_ipaddrs[i], port);
 908                         if (newroute == NULL)
 909                                 return;
 910
 911                         write_lock_bh (global_lock);
 912                 }
 913
 914                 if (peer->ksnp_closing) {
 915                         /* peer got closed under me */
 916                         break;
 917                 }
 918
 919                 /* Already got a route? */
 920                 route = NULL;
 921                 list_for_each(rtmp, &peer->ksnp_routes) {
 922                         route = list_entry(rtmp, ksock_route_t, ksnr_list);
 923
 924                         if (route->ksnr_ipaddr == newroute->ksnr_ipaddr)
 925                                 break;
 926
 927                         route = NULL;
 928                 }
 929                 if (route != NULL)
 930                         continue;
 931
 932                 best_iface = NULL;
 933                 best_nroutes = 0;
 934                 best_netmatch = 0;
 935
 936                 LASSERT (net->ksnn_ninterfaces <= LNET_MAX_INTERFACES);
 937
 938                 /* Select interface to connect from */
 939                 for (j = 0; j < net->ksnn_ninterfaces; j++) {
 940                         iface = &net->ksnn_interfaces[j];
 941
 942                         /* Using this interface already? */
 943                         list_for_each(rtmp, &peer->ksnp_routes) {
 944                                 route = list_entry(rtmp, ksock_route_t, ksnr_list);
 945
 946                                 if (route->ksnr_myipaddr == iface->ksni_ipaddr)
 947                                         break;
 948
 949                                 route = NULL;
 950                         }
 951                         if (route != NULL)
 952                                 continue;
 953
 954                         this_netmatch = (((iface->ksni_ipaddr ^
 955                                            newroute->ksnr_ipaddr) &
 956                                            iface->ksni_netmask) == 0) ? 1 : 0;
 957
 958                         if (!(best_iface == NULL ||
 959                               best_netmatch < this_netmatch ||
 960                               (best_netmatch == this_netmatch &&
 961                                best_nroutes > iface->ksni_nroutes)))
 962                                 continue;
 963
 964                         best_iface = iface;
 965                         best_netmatch = this_netmatch;
 966                         best_nroutes = iface->ksni_nroutes;
 967                 }
 968
 969                 if (best_iface == NULL)
 970                         continue;
 971
 972                 newroute->ksnr_myipaddr = best_iface->ksni_ipaddr;
 973                 best_iface->ksni_nroutes++;
 974
 975                 ksocknal_add_route_locked(peer, newroute);
 976                 newroute = NULL;
 977         }
 978
 979         write_unlock_bh (global_lock);
 980         if (newroute != NULL)
 981                 ksocknal_route_decref(newroute);
 982 }
 983
 984 int
 985 ksocknal_accept (lnet_ni_t *ni, cfs_socket_t *sock)
 986 {
 987         ksock_connreq_t    *cr;
 988         int                 rc;
 989         __u32               peer_ip;
 990         int                 peer_port;
 991
 992         rc = libcfs_sock_getaddr(sock, 1, &peer_ip, &peer_port);
 993         LASSERT (rc == 0);                      /* we succeeded before */
 994
 995         LIBCFS_ALLOC(cr, sizeof(*cr));
 996         if (cr == NULL) {
 997                 LCONSOLE_ERROR_MSG(0x12f, "Dropping connection request from "
 998                                    "%u.%u.%u.%u: memory exhausted\n",
 999                                    HIPQUAD(peer_ip));
1000                 return -ENOMEM;
1001         }
1002
1003         lnet_ni_addref(ni);
1004         cr->ksncr_ni   = ni;
1005         cr->ksncr_sock = sock;
1006
1007         spin_lock_bh (&ksocknal_data.ksnd_connd_lock);
1008
1009         list_add_tail(&cr->ksncr_list, &ksocknal_data.ksnd_connd_connreqs);
1010         cfs_waitq_signal(&ksocknal_data.ksnd_connd_waitq);
1011
1012         spin_unlock_bh (&ksocknal_data.ksnd_connd_lock);
1013         return 0;
1014 }
1015
1016 int
1017 ksocknal_connecting (ksock_peer_t *peer, __u32 ipaddr)
1018 {
1019         ksock_route_t   *route;
1020
1021         list_for_each_entry (route, &peer->ksnp_routes, ksnr_list) {
1022
1023                 if (route->ksnr_ipaddr == ipaddr)
1024                         return route->ksnr_connecting;
1025         }
1026         return 0;
1027 }
1028
1029 int
1030 ksocknal_create_conn (lnet_ni_t *ni, ksock_route_t *route,
1031                       cfs_socket_t *sock, int type)
1032 {
1033         rwlock_t          *global_lock = &ksocknal_data.ksnd_global_lock;
1034         CFS_LIST_HEAD     (zombies);
1035         lnet_process_id_t  peerid;
1036         struct list_head  *tmp;
1037         __u64              incarnation;
1038         ksock_conn_t      *conn;
1039         ksock_conn_t      *conn2;
1040         ksock_peer_t      *peer = NULL;
1041         ksock_peer_t      *peer2;
1042         ksock_sched_t     *sched;
1043         ksock_hello_msg_t *hello;
1044         unsigned int       irq;
1045         ksock_tx_t        *tx;
1046         int                rc;
1047         int                active;
1048         char              *warn = NULL;
1049
1050         active = (route != NULL);
1051
1052         LASSERT (active == (type != SOCKLND_CONN_NONE));
1053
1054         irq = ksocknal_lib_sock_irq (sock);
1055
1056         LIBCFS_ALLOC(conn, sizeof(*conn));
1057         if (conn == NULL) {
1058                 rc = -ENOMEM;
1059                 goto failed_0;
1060         }
1061
1062         memset (conn, 0, sizeof (*conn));
1063         conn->ksnc_peer = NULL;
1064         conn->ksnc_route = NULL;
1065         conn->ksnc_sock = sock;
1066         /* 2 ref, 1 for conn, another extra ref prevents socket
1067          * being closed before establishment of connection */
1068         atomic_set (&conn->ksnc_sock_refcount, 2);
1069         conn->ksnc_type = type;
1070         ksocknal_lib_save_callback(sock, conn);
1071         atomic_set (&conn->ksnc_conn_refcount, 1); /* 1 ref for me */
1072
1073         conn->ksnc_zc_capable = ksocknal_lib_zc_capable(sock);
1074         conn->ksnc_rx_ready = 0;
1075         conn->ksnc_rx_scheduled = 0;
1076
1077         CFS_INIT_LIST_HEAD (&conn->ksnc_tx_queue);
1078         conn->ksnc_tx_ready = 0;
1079         conn->ksnc_tx_scheduled = 0;
1080         conn->ksnc_tx_mono = NULL;
1081         atomic_set (&conn->ksnc_tx_nob, 0);
1082
1083         LIBCFS_ALLOC(hello, offsetof(ksock_hello_msg_t,
1084                                      kshm_ips[LNET_MAX_INTERFACES]));
1085         if (hello == NULL) {
1086                 rc = -ENOMEM;
1087                 goto failed_1;
1088         }
1089
1090         /* stash conn's local and remote addrs */
1091         rc = ksocknal_lib_get_conn_addrs (conn);
1092         if (rc != 0)
1093                 goto failed_1;
1094
1095         /* Find out/confirm peer's NID and connection type and get the
1096          * vector of interfaces she's willing to let me connect to.
1097          * Passive connections use the listener timeout since the peer sends
1098          * eagerly */
1099
1100         if (active) {
1101                 peer = route->ksnr_peer;
1102                 LASSERT(ni == peer->ksnp_ni);
1103
1104                 /* Active connection sends HELLO eagerly */
1105                 hello->kshm_nips = ksocknal_local_ipvec(ni, hello->kshm_ips);
1106                 peerid = peer->ksnp_id;
1107
1108                 write_lock_bh(global_lock);
1109                 conn->ksnc_proto = peer->ksnp_proto;
1110                 write_unlock_bh(global_lock);
1111
1112                 if (conn->ksnc_proto == NULL) {
1113                         conn->ksnc_proto = &ksocknal_protocol_v2x;
1114 #if SOCKNAL_VERSION_DEBUG
1115                         if (*ksocknal_tunables.ksnd_protocol != 2)
1116                                 conn->ksnc_proto = &ksocknal_protocol_v1x;
1117 #endif
1118                 }
1119
1120                 rc = ksocknal_send_hello (ni, conn, peerid.nid, hello);
1121                 if (rc != 0)
1122                         goto failed_1;
1123         } else {
1124                 peerid.nid = LNET_NID_ANY;
1125                 peerid.pid = LNET_PID_ANY;
1126
1127                 /* Passive, get protocol from peer */
1128                 conn->ksnc_proto = NULL;
1129         }
1130
1131         rc = ksocknal_recv_hello (ni, conn, hello, &peerid, &incarnation);
1132         if (rc < 0)
1133                 goto failed_1;
1134
1135         LASSERT (rc == 0 || active);
1136         LASSERT (conn->ksnc_proto != NULL);
1137         LASSERT (peerid.nid != LNET_NID_ANY);
1138
1139         if (active) {
1140                 ksocknal_peer_addref(peer);
1141                 write_lock_bh (global_lock);
1142         } else {
1143                 rc = ksocknal_create_peer(&peer, ni, peerid);
1144                 if (rc != 0)
1145                         goto failed_1;
1146
1147                 write_lock_bh (global_lock);
1148
1149                 /* called with a ref on ni, so shutdown can't have started */
1150                 LASSERT (((ksock_net_t *) ni->ni_data)->ksnn_shutdown == 0);
1151
1152                 peer2 = ksocknal_find_peer_locked(ni, peerid);
1153                 if (peer2 == NULL) {
1154                         /* NB this puts an "empty" peer in the peer
1155                          * table (which takes my ref) */
1156                         list_add_tail(&peer->ksnp_list,
1157                                       ksocknal_nid2peerlist(peerid.nid));
1158                 } else {
1159                         ksocknal_peer_decref(peer);
1160                         peer = peer2;
1161                 }
1162
1163                 /* +1 ref for me */
1164                 ksocknal_peer_addref(peer);
1165                 peer->ksnp_accepting++;
1166
1167                 /* Am I already connecting to this guy?  Resolve in
1168                  * favour of higher NID... */
1169                 if (peerid.nid < ni->ni_nid &&
1170                     ksocknal_connecting(peer, conn->ksnc_ipaddr)) {
1171                         rc = EALREADY;
1172                         warn = "connection race resolution";
1173                         goto failed_2;
1174                 }
1175         }
1176
1177         if (peer->ksnp_closing ||
1178             (active && route->ksnr_deleted)) {
1179                 /* peer/route got closed under me */
1180                 rc = -ESTALE;
1181                 warn = "peer/route removed";
1182                 goto failed_2;
1183         }
1184
1185         if (peer->ksnp_proto == NULL) {
1186                 /* Never connected before.
1187                  * NB recv_hello may have returned EPROTO to signal my peer
1188                  * wants a different protocol than the one I asked for.
1189                  */
1190                 LASSERT (list_empty(&peer->ksnp_conns));
1191
1192                 peer->ksnp_proto = conn->ksnc_proto;
1193                 peer->ksnp_incarnation = incarnation;
1194         }
1195
1196         if (peer->ksnp_proto != conn->ksnc_proto ||
1197             peer->ksnp_incarnation != incarnation) {
1198                 /* Peer rebooted or I've got the wrong protocol version */
1199                 ksocknal_close_peer_conns_locked(peer, 0, 0);
1200
1201                 peer->ksnp_proto = NULL;
1202                 rc = ESTALE;
1203                 warn = peer->ksnp_incarnation != incarnation ?
1204                        "peer rebooted" :
1205                        "wrong proto version";
1206                 goto failed_2;
1207         }
1208
1209         switch (rc) {
1210         default:
1211                 LBUG();
1212         case 0:
1213                 break;
1214         case EALREADY:
1215                 warn = "lost conn race";
1216                 goto failed_2;
1217         case EPROTO:
1218                 warn = "retry with different protocol version";
1219                 goto failed_2;
1220         }
1221
1222         /* Refuse to duplicate an existing connection, unless this is a
1223          * loopback connection */
1224         if (conn->ksnc_ipaddr != conn->ksnc_myipaddr) {
1225                 list_for_each(tmp, &peer->ksnp_conns) {
1226                         conn2 = list_entry(tmp, ksock_conn_t, ksnc_list);
1227
1228                         if (conn2->ksnc_ipaddr != conn->ksnc_ipaddr ||
1229                             conn2->ksnc_myipaddr != conn->ksnc_myipaddr ||
1230                             conn2->ksnc_type != conn->ksnc_type)
1231                                 continue;
1232
1233                         /* Reply on a passive connection attempt so the peer
1234                          * realises we're connected. */
1235                         LASSERT (rc == 0);
1236                         if (!active)
1237                                 rc = EALREADY;
1238
1239                         warn = "duplicate";
1240                         goto failed_2;
1241                 }
1242         }
1243
1244         /* If the connection created by this route didn't bind to the IP
1245          * address the route connected to, the connection/route matching
1246          * code below probably isn't going to work. */
1247         if (active &&
1248             route->ksnr_ipaddr != conn->ksnc_ipaddr) {
1249                 CERROR("Route %s %u.%u.%u.%u connected to %u.%u.%u.%u\n",
1250                        libcfs_id2str(peer->ksnp_id),
1251                        HIPQUAD(route->ksnr_ipaddr),
1252                        HIPQUAD(conn->ksnc_ipaddr));
1253         }
1254
1255         /* Search for a route corresponding to the new connection and
1256          * create an association.  This allows incoming connections created
1257          * by routes in my peer to match my own route entries so I don't
1258          * continually create duplicate routes. */
1259         list_for_each (tmp, &peer->ksnp_routes) {
1260                 route = list_entry(tmp, ksock_route_t, ksnr_list);
1261
1262                 if (route->ksnr_ipaddr != conn->ksnc_ipaddr)
1263                         continue;
1264
1265                 ksocknal_associate_route_conn_locked(route, conn);
1266                 break;
1267         }
1268
1269         conn->ksnc_peer = peer;                 /* conn takes my ref on peer */
1270         peer->ksnp_last_alive = cfs_time_current();
1271         peer->ksnp_error = 0;
1272
1273         sched = ksocknal_choose_scheduler_locked (irq);
1274         sched->kss_nconns++;
1275         conn->ksnc_scheduler = sched;
1276
1277         /* Set the deadline for the outgoing HELLO to drain */
1278         conn->ksnc_tx_bufnob = SOCK_WMEM_QUEUED(sock);
1279         conn->ksnc_tx_deadline = cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
1280         mb();       /* order with adding to peer's conn list */
1281
1282         list_add (&conn->ksnc_list, &peer->ksnp_conns);
1283         ksocknal_conn_addref(conn);
1284
1285         ksocknal_new_packet(conn, 0);
1286
1287         /* Take all the packets blocking for a connection.
1288          * NB, it might be nicer to share these blocked packets among any
1289          * other connections that are becoming established. */
1290         while (!list_empty (&peer->ksnp_tx_queue)) {
1291                 tx = list_entry (peer->ksnp_tx_queue.next,
1292                                  ksock_tx_t, tx_list);
1293
1294                 list_del (&tx->tx_list);
1295                 ksocknal_queue_tx_locked (tx, conn);
1296         }
1297
1298         write_unlock_bh (global_lock);
1299
1300         /* We've now got a new connection.  Any errors from here on are just
1301          * like "normal" comms errors and we close the connection normally.
1302          * NB (a) we still have to send the reply HELLO for passive
1303          *        connections,
1304          *    (b) normal I/O on the conn is blocked until I setup and call the
1305          *        socket callbacks.
1306          */
1307
1308         ksocknal_lib_bind_irq (irq);
1309
1310         CDEBUG(D_NET, "New conn %s p %d.x %u.%u.%u.%u -> %u.%u.%u.%u/%d"
1311                " incarnation:"LPD64" sched[%d]/%d\n",
1312                libcfs_id2str(peerid), conn->ksnc_proto->pro_version,
1313                HIPQUAD(conn->ksnc_myipaddr), HIPQUAD(conn->ksnc_ipaddr),
1314                conn->ksnc_port, incarnation,
1315                (int)(conn->ksnc_scheduler - ksocknal_data.ksnd_schedulers), irq);
1316
1317         if (active) {
1318                 /* additional routes after interface exchange? */
1319                 ksocknal_create_routes(peer, conn->ksnc_port,
1320                                        hello->kshm_ips, hello->kshm_nips);
1321         } else {
1322                 hello->kshm_nips = ksocknal_select_ips(peer, hello->kshm_ips,
1323                                                        hello->kshm_nips);
1324                 rc = ksocknal_send_hello(ni, conn, peerid.nid, hello);
1325         }
1326
1327         LIBCFS_FREE(hello, offsetof(ksock_hello_msg_t,
1328                                     kshm_ips[LNET_MAX_INTERFACES]));
1329
1330         /* setup the socket AFTER I've received hello (it disables
1331          * SO_LINGER).  I might call back to the acceptor who may want
1332          * to send a protocol version response and then close the
1333          * socket; this ensures the socket only tears down after the
1334          * response has been sent. */
1335         if (rc == 0)
1336                 rc = ksocknal_lib_setup_sock(sock);
1337
1338         write_lock_bh(global_lock);
1339
1340         /* NB my callbacks block while I hold ksnd_global_lock */
1341         ksocknal_lib_set_callback(sock, conn);
1342
1343         if (!active)
1344                 peer->ksnp_accepting--;
1345
1346         write_unlock_bh(global_lock);
1347
1348         if (rc != 0) {
1349                 write_lock_bh(global_lock);
1350                 ksocknal_close_conn_locked(conn, rc);
1351                 write_unlock_bh(global_lock);
1352         } else if (ksocknal_connsock_addref(conn) == 0) {
1353                 /* Allow I/O to proceed. */
1354                 ksocknal_read_callback(conn);
1355                 ksocknal_write_callback(conn);
1356                 ksocknal_connsock_decref(conn);
1357         }
1358
1359         ksocknal_connsock_decref(conn);
1360         ksocknal_conn_decref(conn);
1361         return rc;
1362
1363  failed_2:
1364         if (!peer->ksnp_closing &&
1365             list_empty (&peer->ksnp_conns) &&
1366             list_empty (&peer->ksnp_routes)) {
1367                 list_add(&zombies, &peer->ksnp_tx_queue);
1368                 list_del_init(&peer->ksnp_tx_queue);
1369                 ksocknal_unlink_peer_locked(peer);
1370         }
1371
1372         write_unlock_bh (global_lock);
1373
1374         if (warn != NULL) {
1375                 if (rc < 0)
1376                         CERROR("Not creating conn %s type %d: %s\n",
1377                                libcfs_id2str(peerid), conn->ksnc_type, warn);
1378                 else
1379                         CDEBUG(D_NET, "Not creating conn %s type %d: %s\n",
1380                               libcfs_id2str(peerid), conn->ksnc_type, warn);
1381         }
1382
1383         if (!active) {
1384                 if (rc > 0) {
1385                         /* Request retry by replying with CONN_NONE
1386                          * ksnc_proto has been set already */
1387                         conn->ksnc_type = SOCKLND_CONN_NONE;
1388                         hello->kshm_nips = 0;
1389                         ksocknal_send_hello(ni, conn, peerid.nid, hello);
1390                 }
1391
1392                 write_lock_bh(global_lock);
1393                 peer->ksnp_accepting--;
1394                 write_unlock_bh(global_lock);
1395         }
1396
1397         ksocknal_txlist_done(ni, &zombies, 1);
1398         ksocknal_peer_decref(peer);
1399
1400  failed_1:
1401         if (hello != NULL)
1402                 LIBCFS_FREE(hello, offsetof(ksock_hello_msg_t,
1403                                             kshm_ips[LNET_MAX_INTERFACES]));
1404
1405         LIBCFS_FREE (conn, sizeof(*conn));
1406
1407  failed_0:
1408         libcfs_sock_release(sock);
1409         return rc;
1410 }
1411
1412 void
1413 ksocknal_close_conn_locked (ksock_conn_t *conn, int error)
1414 {
1415         /* This just does the immmediate housekeeping, and queues the
1416          * connection for the reaper to terminate.
1417          * Caller holds ksnd_global_lock exclusively in irq context */
1418         ksock_peer_t      *peer = conn->ksnc_peer;
1419         ksock_route_t     *route;
1420         ksock_conn_t      *conn2;
1421         struct list_head  *tmp;
1422
1423         LASSERT (peer->ksnp_error == 0);
1424         LASSERT (!conn->ksnc_closing);
1425         conn->ksnc_closing = 1;
1426
1427         /* ksnd_deathrow_conns takes over peer's ref */
1428         list_del (&conn->ksnc_list);
1429
1430         route = conn->ksnc_route;
1431         if (route != NULL) {
1432                 /* dissociate conn from route... */
1433                 LASSERT (!route->ksnr_deleted);
1434                 LASSERT ((route->ksnr_connected & (1 << conn->ksnc_type)) != 0);
1435
1436                 conn2 = NULL;
1437                 list_for_each(tmp, &peer->ksnp_conns) {
1438                         conn2 = list_entry(tmp, ksock_conn_t, ksnc_list);
1439
1440                         if (conn2->ksnc_route == route &&
1441                             conn2->ksnc_type == conn->ksnc_type)
1442                                 break;
1443
1444                         conn2 = NULL;
1445                 }
1446                 if (conn2 == NULL)
1447                         route->ksnr_connected &= ~(1 << conn->ksnc_type);
1448
1449                 conn->ksnc_route = NULL;
1450
1451 #if 0           /* irrelevent with only eager routes */
1452                 list_del (&route->ksnr_list);   /* make route least favourite */
1453                 list_add_tail (&route->ksnr_list, &peer->ksnp_routes);
1454 #endif
1455                 ksocknal_route_decref(route);     /* drop conn's ref on route */
1456         }
1457
1458         if (list_empty (&peer->ksnp_conns)) {
1459                 /* No more connections to this peer */
1460
1461                 peer->ksnp_proto = NULL;        /* renegotiate protocol version */
1462                 peer->ksnp_error = error;       /* stash last conn close reason */
1463
1464                 if (list_empty (&peer->ksnp_routes)) {
1465                         /* I've just closed last conn belonging to a
1466                          * peer with no routes to it */
1467                         ksocknal_unlink_peer_locked (peer);
1468                 }
1469         }
1470
1471         spin_lock_bh (&ksocknal_data.ksnd_reaper_lock);
1472
1473         list_add_tail (&conn->ksnc_list, &ksocknal_data.ksnd_deathrow_conns);
1474         cfs_waitq_signal (&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         time_t    last_alive = 0;
1483         int       notify = 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 existance. */
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 = cfs_time_current_sec() -
1497                         cfs_duration_sec(cfs_time_current() -
1498                                          peer->ksnp_last_alive);
1499         }
1500
1501         read_unlock (&ksocknal_data.ksnd_global_lock);
1502
1503         if (notify)
1504                 lnet_notify (peer->ksnp_ni, peer->ksnp_id.nid, 0,
1505                              last_alive);
1506 }
1507
1508 void
1509 ksocknal_terminate_conn (ksock_conn_t *conn)
1510 {
1511         /* This gets called by the reaper (guaranteed thread context) to
1512          * disengage the socket from its callbacks and close it.
1513          * ksnc_refcount will eventually hit zero, and then the reaper will
1514          * destroy it. */
1515         ksock_peer_t     *peer = conn->ksnc_peer;
1516         ksock_sched_t    *sched = conn->ksnc_scheduler;
1517         int               failed = 0;
1518         struct list_head *tmp;
1519         struct list_head *nxt;
1520         ksock_tx_t       *tx;
1521         LIST_HEAD        (zlist);
1522
1523         LASSERT(conn->ksnc_closing);
1524
1525         /* wake up the scheduler to "send" all remaining packets to /dev/null */
1526         spin_lock_bh (&sched->kss_lock);
1527
1528         /* a closing conn is always ready to tx */
1529         conn->ksnc_tx_ready = 1;
1530
1531         if (!conn->ksnc_tx_scheduled &&
1532             !list_empty(&conn->ksnc_tx_queue)){
1533                 list_add_tail (&conn->ksnc_tx_list,
1534                                &sched->kss_tx_conns);
1535                 conn->ksnc_tx_scheduled = 1;
1536                 /* extra ref for scheduler */
1537                 ksocknal_conn_addref(conn);
1538
1539                 cfs_waitq_signal (&sched->kss_waitq);
1540         }
1541
1542         spin_unlock_bh (&sched->kss_lock);
1543
1544         spin_lock(&peer->ksnp_lock);
1545
1546         list_for_each_safe(tmp, nxt, &peer->ksnp_zc_req_list) {
1547                 tx = list_entry(tmp, ksock_tx_t, tx_zc_list);
1548
1549                 if (tx->tx_conn != conn)
1550                         continue;
1551
1552                 LASSERT (tx->tx_msg.ksm_zc_req_cookie != 0);
1553
1554                 tx->tx_msg.ksm_zc_req_cookie = 0;
1555                 list_del(&tx->tx_zc_list);
1556                 list_add(&tx->tx_zc_list, &zlist);
1557         }
1558
1559         spin_unlock(&peer->ksnp_lock);
1560
1561         list_for_each_safe(tmp, nxt, &zlist) {
1562                 tx = list_entry(tmp, ksock_tx_t, tx_zc_list);
1563
1564                 list_del(&tx->tx_zc_list);
1565                 ksocknal_tx_decref(tx);
1566         }
1567
1568         /* serialise with callbacks */
1569         write_lock_bh (&ksocknal_data.ksnd_global_lock);
1570
1571         ksocknal_lib_reset_callback(conn->ksnc_sock, conn);
1572
1573         /* OK, so this conn may not be completely disengaged from its
1574          * scheduler yet, but it _has_ committed to terminate... */
1575         conn->ksnc_scheduler->kss_nconns--;
1576
1577         if (peer->ksnp_error != 0) {
1578                 /* peer's last conn closed in error */
1579                 LASSERT (list_empty (&peer->ksnp_conns));
1580                 failed = 1;
1581                 peer->ksnp_error = 0;     /* avoid multiple notifications */
1582         }
1583
1584         write_unlock_bh (&ksocknal_data.ksnd_global_lock);
1585
1586         if (failed)
1587                 ksocknal_peer_failed(peer);
1588
1589         /* The socket is closed on the final put; either here, or in
1590          * ksocknal_{send,recv}msg().  Since we set up the linger2 option
1591          * when the connection was established, this will close the socket
1592          * immediately, aborting anything buffered in it. Any hung
1593          * zero-copy transmits will therefore complete in finite time. */
1594         ksocknal_connsock_decref(conn);
1595 }
1596
1597 void
1598 ksocknal_queue_zombie_conn (ksock_conn_t *conn)
1599 {
1600         /* Queue the conn for the reaper to destroy */
1601
1602         LASSERT (atomic_read(&conn->ksnc_conn_refcount) == 0);
1603         spin_lock_bh (&ksocknal_data.ksnd_reaper_lock);
1604
1605         list_add_tail(&conn->ksnc_list, &ksocknal_data.ksnd_zombie_conns);
1606         cfs_waitq_signal(&ksocknal_data.ksnd_reaper_waitq);
1607
1608         spin_unlock_bh (&ksocknal_data.ksnd_reaper_lock);
1609 }
1610
1611 void
1612 ksocknal_destroy_conn (ksock_conn_t *conn)
1613 {
1614         /* Final coup-de-grace of the reaper */
1615         CDEBUG (D_NET, "connection %p\n", conn);
1616
1617         LASSERT (atomic_read (&conn->ksnc_conn_refcount) == 0);
1618         LASSERT (atomic_read (&conn->ksnc_sock_refcount) == 0);
1619         LASSERT (conn->ksnc_sock == NULL);
1620         LASSERT (conn->ksnc_route == NULL);
1621         LASSERT (!conn->ksnc_tx_scheduled);
1622         LASSERT (!conn->ksnc_rx_scheduled);
1623         LASSERT (list_empty(&conn->ksnc_tx_queue));
1624
1625         /* complete current receive if any */
1626         switch (conn->ksnc_rx_state) {
1627         case SOCKNAL_RX_LNET_PAYLOAD:
1628                 CERROR("Completing partial receive from %s"
1629                        ", ip %d.%d.%d.%d:%d, with error\n",
1630                        libcfs_id2str(conn->ksnc_peer->ksnp_id),
1631                        HIPQUAD(conn->ksnc_ipaddr), conn->ksnc_port);
1632                 lnet_finalize (conn->ksnc_peer->ksnp_ni,
1633                                conn->ksnc_cookie, -EIO);
1634                 break;
1635         case SOCKNAL_RX_LNET_HEADER:
1636                 if (conn->ksnc_rx_started)
1637                         CERROR("Incomplete receive of lnet header from %s"
1638                                ", ip %d.%d.%d.%d:%d, with error, protocol: %d.x.\n",
1639                                libcfs_id2str(conn->ksnc_peer->ksnp_id),
1640                                HIPQUAD(conn->ksnc_ipaddr), conn->ksnc_port,
1641                                conn->ksnc_proto->pro_version);
1642                 break;
1643         case SOCKNAL_RX_KSM_HEADER:
1644                 if (conn->ksnc_rx_started)
1645                         CERROR("Incomplete receive of ksock message from %s"
1646                                ", ip %d.%d.%d.%d:%d, with error, protocol: %d.x.\n",
1647                                libcfs_id2str(conn->ksnc_peer->ksnp_id),
1648                                HIPQUAD(conn->ksnc_ipaddr), conn->ksnc_port,
1649                                conn->ksnc_proto->pro_version);
1650                 break;
1651         case SOCKNAL_RX_SLOP:
1652                 if (conn->ksnc_rx_started)
1653                         CERROR("Incomplete receive of slops from %s"
1654                                ", ip %d.%d.%d.%d:%d, with error\n",
1655                                libcfs_id2str(conn->ksnc_peer->ksnp_id),
1656                                HIPQUAD(conn->ksnc_ipaddr), conn->ksnc_port);
1657                break;
1658         default:
1659                 LBUG ();
1660                 break;
1661         }
1662
1663         ksocknal_peer_decref(conn->ksnc_peer);
1664
1665         LIBCFS_FREE (conn, sizeof (*conn));
1666 }
1667
1668 int
1669 ksocknal_close_peer_conns_locked (ksock_peer_t *peer, __u32 ipaddr, int why)
1670 {
1671         ksock_conn_t       *conn;
1672         struct list_head   *ctmp;
1673         struct list_head   *cnxt;
1674         int                 count = 0;
1675
1676         list_for_each_safe (ctmp, cnxt, &peer->ksnp_conns) {
1677                 conn = list_entry (ctmp, ksock_conn_t, ksnc_list);
1678
1679                 if (ipaddr == 0 ||
1680                     conn->ksnc_ipaddr == ipaddr) {
1681                         count++;
1682                         ksocknal_close_conn_locked (conn, why);
1683                 }
1684         }
1685
1686         return (count);
1687 }
1688
1689 int
1690 ksocknal_close_conn_and_siblings (ksock_conn_t *conn, int why)
1691 {
1692         ksock_peer_t     *peer = conn->ksnc_peer;
1693         __u32             ipaddr = conn->ksnc_ipaddr;
1694         int               count;
1695
1696         write_lock_bh (&ksocknal_data.ksnd_global_lock);
1697
1698         count = ksocknal_close_peer_conns_locked (peer, ipaddr, why);
1699
1700         write_unlock_bh (&ksocknal_data.ksnd_global_lock);
1701
1702         return (count);
1703 }
1704
1705 int
1706 ksocknal_close_matching_conns (lnet_process_id_t id, __u32 ipaddr)
1707 {
1708         ksock_peer_t       *peer;
1709         struct list_head   *ptmp;
1710         struct list_head   *pnxt;
1711         int                 lo;
1712         int                 hi;
1713         int                 i;
1714         int                 count = 0;
1715
1716         write_lock_bh (&ksocknal_data.ksnd_global_lock);
1717
1718         if (id.nid != LNET_NID_ANY)
1719                 lo = hi = ksocknal_nid2peerlist(id.nid) - ksocknal_data.ksnd_peers;
1720         else {
1721                 lo = 0;
1722                 hi = ksocknal_data.ksnd_peer_hash_size - 1;
1723         }
1724
1725         for (i = lo; i <= hi; i++) {
1726                 list_for_each_safe (ptmp, pnxt, &ksocknal_data.ksnd_peers[i]) {
1727
1728                         peer = list_entry (ptmp, ksock_peer_t, ksnp_list);
1729
1730                         if (!((id.nid == LNET_NID_ANY || id.nid == peer->ksnp_id.nid) &&
1731                               (id.pid == LNET_PID_ANY || id.pid == peer->ksnp_id.pid)))
1732                                 continue;
1733
1734                         count += ksocknal_close_peer_conns_locked (peer, ipaddr, 0);
1735                 }
1736         }
1737
1738         write_unlock_bh (&ksocknal_data.ksnd_global_lock);
1739
1740         /* wildcards always succeed */
1741         if (id.nid == LNET_NID_ANY || id.pid == LNET_PID_ANY || ipaddr == 0)
1742                 return (0);
1743
1744         return (count == 0 ? -ENOENT : 0);
1745 }
1746
1747 void
1748 ksocknal_notify (lnet_ni_t *ni, lnet_nid_t gw_nid, int alive)
1749 {
1750         /* The router is telling me she's been notified of a change in
1751          * gateway state.... */
1752         lnet_process_id_t  id = {.nid = gw_nid, .pid = LNET_PID_ANY};
1753
1754         CDEBUG (D_NET, "gw %s %s\n", libcfs_nid2str(gw_nid),
1755                 alive ? "up" : "down");
1756
1757         if (!alive) {
1758                 /* If the gateway crashed, close all open connections... */
1759                 ksocknal_close_matching_conns (id, 0);
1760                 return;
1761         }
1762
1763         /* ...otherwise do nothing.  We can only establish new connections
1764          * if we have autroutes, and these connect on demand. */
1765 }
1766
1767 void
1768 ksocknal_push_peer (ksock_peer_t *peer)
1769 {
1770         int               index;
1771         int               i;
1772         struct list_head *tmp;
1773         ksock_conn_t     *conn;
1774
1775         for (index = 0; ; index++) {
1776                 read_lock (&ksocknal_data.ksnd_global_lock);
1777
1778                 i = 0;
1779                 conn = NULL;
1780
1781                 list_for_each (tmp, &peer->ksnp_conns) {
1782                         if (i++ == index) {
1783                                 conn = list_entry (tmp, ksock_conn_t, ksnc_list);
1784                                 ksocknal_conn_addref(conn);
1785                                 break;
1786                         }
1787                 }
1788
1789                 read_unlock (&ksocknal_data.ksnd_global_lock);
1790
1791                 if (conn == NULL)
1792                         break;
1793
1794                 ksocknal_lib_push_conn (conn);
1795                 ksocknal_conn_decref(conn);
1796         }
1797 }
1798
1799 int
1800 ksocknal_push (lnet_ni_t *ni, lnet_process_id_t id)
1801 {
1802         ksock_peer_t      *peer;
1803         struct list_head  *tmp;
1804         int                index;
1805         int                i;
1806         int                j;
1807         int                rc = -ENOENT;
1808
1809         for (i = 0; i < ksocknal_data.ksnd_peer_hash_size; i++) {
1810                 for (j = 0; ; j++) {
1811                         read_lock (&ksocknal_data.ksnd_global_lock);
1812
1813                         index = 0;
1814                         peer = NULL;
1815
1816                         list_for_each (tmp, &ksocknal_data.ksnd_peers[i]) {
1817                                 peer = list_entry(tmp, ksock_peer_t,
1818                                                   ksnp_list);
1819
1820                                 if (!((id.nid == LNET_NID_ANY ||
1821                                        id.nid == peer->ksnp_id.nid) &&
1822                                       (id.pid == LNET_PID_ANY ||
1823                                        id.pid == peer->ksnp_id.pid))) {
1824                                         peer = NULL;
1825                                         continue;
1826                                 }
1827
1828                                 if (index++ == j) {
1829                                         ksocknal_peer_addref(peer);
1830                                         break;
1831                                 }
1832                         }
1833
1834                         read_unlock (&ksocknal_data.ksnd_global_lock);
1835
1836                         if (peer != NULL) {
1837                                 rc = 0;
1838                                 ksocknal_push_peer (peer);
1839                                 ksocknal_peer_decref(peer);
1840                         }
1841                 }
1842
1843         }
1844
1845         return (rc);
1846 }
1847
1848 int
1849 ksocknal_add_interface(lnet_ni_t *ni, __u32 ipaddress, __u32 netmask)
1850 {
1851         ksock_net_t       *net = ni->ni_data;
1852         ksock_interface_t *iface;
1853         int                rc;
1854         int                i;
1855         int                j;
1856         struct list_head  *ptmp;
1857         ksock_peer_t      *peer;
1858         struct list_head  *rtmp;
1859         ksock_route_t     *route;
1860
1861         if (ipaddress == 0 ||
1862             netmask == 0)
1863                 return (-EINVAL);
1864
1865         write_lock_bh (&ksocknal_data.ksnd_global_lock);
1866
1867         iface = ksocknal_ip2iface(ni, ipaddress);
1868         if (iface != NULL) {
1869                 /* silently ignore dups */
1870                 rc = 0;
1871         } else if (net->ksnn_ninterfaces == LNET_MAX_INTERFACES) {
1872                 rc = -ENOSPC;
1873         } else {
1874                 iface = &net->ksnn_interfaces[net->ksnn_ninterfaces++];
1875
1876                 iface->ksni_ipaddr = ipaddress;
1877                 iface->ksni_netmask = netmask;
1878                 iface->ksni_nroutes = 0;
1879                 iface->ksni_npeers = 0;
1880
1881                 for (i = 0; i < ksocknal_data.ksnd_peer_hash_size; i++) {
1882                         list_for_each(ptmp, &ksocknal_data.ksnd_peers[i]) {
1883                                 peer = list_entry(ptmp, ksock_peer_t, ksnp_list);
1884
1885                                 for (j = 0; j < peer->ksnp_n_passive_ips; j++)
1886                                         if (peer->ksnp_passive_ips[j] == ipaddress)
1887                                                 iface->ksni_npeers++;
1888
1889                                 list_for_each(rtmp, &peer->ksnp_routes) {
1890                                         route = list_entry(rtmp, ksock_route_t, ksnr_list);
1891
1892                                         if (route->ksnr_myipaddr == ipaddress)
1893                                                 iface->ksni_nroutes++;
1894                                 }
1895                         }
1896                 }
1897
1898                 rc = 0;
1899                 /* NB only new connections will pay attention to the new interface! */
1900         }
1901
1902         write_unlock_bh (&ksocknal_data.ksnd_global_lock);
1903
1904         return (rc);
1905 }
1906
1907 void
1908 ksocknal_peer_del_interface_locked(ksock_peer_t *peer, __u32 ipaddr)
1909 {
1910         struct list_head   *tmp;
1911         struct list_head   *nxt;
1912         ksock_route_t      *route;
1913         ksock_conn_t       *conn;
1914         int                 i;
1915         int                 j;
1916
1917         for (i = 0; i < peer->ksnp_n_passive_ips; i++)
1918                 if (peer->ksnp_passive_ips[i] == ipaddr) {
1919                         for (j = i+1; j < peer->ksnp_n_passive_ips; j++)
1920                                 peer->ksnp_passive_ips[j-1] =
1921                                         peer->ksnp_passive_ips[j];
1922                         peer->ksnp_n_passive_ips--;
1923                         break;
1924                 }
1925
1926         list_for_each_safe(tmp, nxt, &peer->ksnp_routes) {
1927                 route = list_entry (tmp, ksock_route_t, ksnr_list);
1928
1929                 if (route->ksnr_myipaddr != ipaddr)
1930                         continue;
1931
1932                 if (route->ksnr_share_count != 0) {
1933                         /* Manually created; keep, but unbind */
1934                         route->ksnr_myipaddr = 0;
1935                 } else {
1936                         ksocknal_del_route_locked(route);
1937                 }
1938         }
1939
1940         list_for_each_safe(tmp, nxt, &peer->ksnp_conns) {
1941                 conn = list_entry(tmp, ksock_conn_t, ksnc_list);
1942
1943                 if (conn->ksnc_myipaddr == ipaddr)
1944                         ksocknal_close_conn_locked (conn, 0);
1945         }
1946 }
1947
1948 int
1949 ksocknal_del_interface(lnet_ni_t *ni, __u32 ipaddress)
1950 {
1951         ksock_net_t       *net = ni->ni_data;
1952         int                rc = -ENOENT;
1953         struct list_head  *tmp;
1954         struct list_head  *nxt;
1955         ksock_peer_t      *peer;
1956         __u32              this_ip;
1957         int                i;
1958         int                j;
1959
1960         write_lock_bh (&ksocknal_data.ksnd_global_lock);
1961
1962         for (i = 0; i < net->ksnn_ninterfaces; i++) {
1963                 this_ip = net->ksnn_interfaces[i].ksni_ipaddr;
1964
1965                 if (!(ipaddress == 0 ||
1966                       ipaddress == this_ip))
1967                         continue;
1968
1969                 rc = 0;
1970
1971                 for (j = i+1; j < net->ksnn_ninterfaces; j++)
1972                         net->ksnn_interfaces[j-1] =
1973                                 net->ksnn_interfaces[j];
1974
1975                 net->ksnn_ninterfaces--;
1976
1977                 for (j = 0; j < ksocknal_data.ksnd_peer_hash_size; j++) {
1978                         list_for_each_safe(tmp, nxt, &ksocknal_data.ksnd_peers[j]) {
1979                                 peer = list_entry(tmp, ksock_peer_t, ksnp_list);
1980
1981                                 if (peer->ksnp_ni != ni)
1982                                         continue;
1983
1984                                 ksocknal_peer_del_interface_locked(peer, this_ip);
1985                         }
1986                 }
1987         }
1988
1989         write_unlock_bh (&ksocknal_data.ksnd_global_lock);
1990
1991         return (rc);
1992 }
1993
1994 int
1995 ksocknal_ctl(lnet_ni_t *ni, unsigned int cmd, void *arg)
1996 {
1997         struct libcfs_ioctl_data *data = arg;
1998         int rc;
1999
2000         switch(cmd) {
2001         case IOC_LIBCFS_GET_INTERFACE: {
2002                 ksock_net_t       *net = ni->ni_data;
2003                 ksock_interface_t *iface;
2004
2005                 read_lock (&ksocknal_data.ksnd_global_lock);
2006
2007                 if (data->ioc_count < 0 ||
2008                     data->ioc_count >= net->ksnn_ninterfaces) {
2009                         rc = -ENOENT;
2010                 } else {
2011                         rc = 0;
2012                         iface = &net->ksnn_interfaces[data->ioc_count];
2013
2014                         data->ioc_u32[0] = iface->ksni_ipaddr;
2015                         data->ioc_u32[1] = iface->ksni_netmask;
2016                         data->ioc_u32[2] = iface->ksni_npeers;
2017                         data->ioc_u32[3] = iface->ksni_nroutes;
2018                 }
2019
2020                 read_unlock (&ksocknal_data.ksnd_global_lock);
2021                 return rc;
2022         }
2023
2024         case IOC_LIBCFS_ADD_INTERFACE:
2025                 return ksocknal_add_interface(ni,
2026                                               data->ioc_u32[0], /* IP address */
2027                                               data->ioc_u32[1]); /* net mask */
2028
2029         case IOC_LIBCFS_DEL_INTERFACE:
2030                 return ksocknal_del_interface(ni,
2031                                               data->ioc_u32[0]); /* IP address */
2032
2033         case IOC_LIBCFS_GET_PEER: {
2034                 lnet_process_id_t id = {0,};
2035                 __u32            myip = 0;
2036                 __u32            ip = 0;
2037                 int              port = 0;
2038                 int              conn_count = 0;
2039                 int              share_count = 0;
2040
2041                 rc = ksocknal_get_peer_info(ni, data->ioc_count,
2042                                             &id, &myip, &ip, &port,
2043                                             &conn_count,  &share_count);
2044                 if (rc != 0)
2045                         return rc;
2046
2047                 data->ioc_nid    = id.nid;
2048                 data->ioc_count  = share_count;
2049                 data->ioc_u32[0] = ip;
2050                 data->ioc_u32[1] = port;
2051                 data->ioc_u32[2] = myip;
2052                 data->ioc_u32[3] = conn_count;
2053                 data->ioc_u32[4] = id.pid;
2054                 return 0;
2055         }
2056
2057         case IOC_LIBCFS_ADD_PEER: {
2058                 lnet_process_id_t  id = {.nid = data->ioc_nid,
2059                                          .pid = LUSTRE_SRV_LNET_PID};
2060                 return ksocknal_add_peer (ni, id,
2061                                           data->ioc_u32[0], /* IP */
2062                                           data->ioc_u32[1]); /* port */
2063         }
2064         case IOC_LIBCFS_DEL_PEER: {
2065                 lnet_process_id_t  id = {.nid = data->ioc_nid,
2066                                          .pid = LNET_PID_ANY};
2067                 return ksocknal_del_peer (ni, id,
2068                                           data->ioc_u32[0]); /* IP */
2069         }
2070         case IOC_LIBCFS_GET_CONN: {
2071                 int           txmem;
2072                 int           rxmem;
2073                 int           nagle;
2074                 ksock_conn_t *conn = ksocknal_get_conn_by_idx (ni, data->ioc_count);
2075
2076                 if (conn == NULL)
2077                         return -ENOENT;
2078
2079                 ksocknal_lib_get_conn_tunables(conn, &txmem, &rxmem, &nagle);
2080
2081                 data->ioc_count  = txmem;
2082                 data->ioc_nid    = conn->ksnc_peer->ksnp_id.nid;
2083                 data->ioc_flags  = nagle;
2084                 data->ioc_u32[0] = conn->ksnc_ipaddr;
2085                 data->ioc_u32[1] = conn->ksnc_port;
2086                 data->ioc_u32[2] = conn->ksnc_myipaddr;
2087                 data->ioc_u32[3] = conn->ksnc_type;
2088                 data->ioc_u32[4] = conn->ksnc_scheduler -
2089                                    ksocknal_data.ksnd_schedulers;
2090                 data->ioc_u32[5] = rxmem;
2091                 data->ioc_u32[6] = conn->ksnc_peer->ksnp_id.pid;
2092                 ksocknal_conn_decref(conn);
2093                 return 0;
2094         }
2095
2096         case IOC_LIBCFS_CLOSE_CONNECTION: {
2097                 lnet_process_id_t  id = {.nid = data->ioc_nid,
2098                                         .pid = LNET_PID_ANY};
2099
2100                 return ksocknal_close_matching_conns (id,
2101                                                       data->ioc_u32[0]);
2102         }
2103         case IOC_LIBCFS_REGISTER_MYNID:
2104                 /* Ignore if this is a noop */
2105                 if (data->ioc_nid == ni->ni_nid)
2106                         return 0;
2107
2108                 CERROR("obsolete IOC_LIBCFS_REGISTER_MYNID: %s(%s)\n",
2109                        libcfs_nid2str(data->ioc_nid),
2110                        libcfs_nid2str(ni->ni_nid));
2111                 return -EINVAL;
2112
2113         case IOC_LIBCFS_PUSH_CONNECTION: {
2114                 lnet_process_id_t  id = {.nid = data->ioc_nid,
2115                                         .pid = LNET_PID_ANY};
2116
2117                 return ksocknal_push(ni, id);
2118         }
2119         default:
2120                 return -EINVAL;
2121         }
2122         /* not reached */
2123 }
2124
2125 void
2126 ksocknal_free_buffers (void)
2127 {
2128         LASSERT (atomic_read(&ksocknal_data.ksnd_nactive_txs) == 0);
2129
2130         if (ksocknal_data.ksnd_schedulers != NULL)
2131                 LIBCFS_FREE (ksocknal_data.ksnd_schedulers,
2132                              sizeof (ksock_sched_t) * ksocknal_data.ksnd_nschedulers);
2133
2134         LIBCFS_FREE (ksocknal_data.ksnd_peers,
2135                      sizeof (struct list_head) *
2136                      ksocknal_data.ksnd_peer_hash_size);
2137
2138         spin_lock(&ksocknal_data.ksnd_tx_lock);
2139
2140         if (!list_empty(&ksocknal_data.ksnd_idle_noop_txs)) {
2141                 struct list_head  zlist;
2142                 ksock_tx_t       *tx;
2143
2144                 list_add(&zlist, &ksocknal_data.ksnd_idle_noop_txs);
2145                 list_del_init(&ksocknal_data.ksnd_idle_noop_txs);
2146                 spin_unlock(&ksocknal_data.ksnd_tx_lock);
2147
2148                 while(!list_empty(&zlist)) {
2149                         tx = list_entry(zlist.next, ksock_tx_t, tx_list);
2150                         list_del(&tx->tx_list);
2151                         LIBCFS_FREE(tx, tx->tx_desc_size);
2152                 }
2153         } else {
2154                 spin_unlock(&ksocknal_data.ksnd_tx_lock);
2155         }
2156 }
2157
2158 void
2159 ksocknal_base_shutdown (void)
2160 {
2161         ksock_sched_t *sched;
2162         int            i;
2163
2164         CDEBUG(D_MALLOC, "before NAL cleanup: kmem %d\n",
2165                atomic_read (&libcfs_kmemory));
2166         LASSERT (ksocknal_data.ksnd_nnets == 0);
2167
2168         switch (ksocknal_data.ksnd_init) {
2169         default:
2170                 LASSERT (0);
2171
2172         case SOCKNAL_INIT_ALL:
2173         case SOCKNAL_INIT_DATA:
2174                 LASSERT (ksocknal_data.ksnd_peers != NULL);
2175                 for (i = 0; i < ksocknal_data.ksnd_peer_hash_size; i++) {
2176                         LASSERT (list_empty (&ksocknal_data.ksnd_peers[i]));
2177                 }
2178                 LASSERT (list_empty (&ksocknal_data.ksnd_enomem_conns));
2179                 LASSERT (list_empty (&ksocknal_data.ksnd_zombie_conns));
2180                 LASSERT (list_empty (&ksocknal_data.ksnd_connd_connreqs));
2181                 LASSERT (list_empty (&ksocknal_data.ksnd_connd_routes));
2182
2183                 if (ksocknal_data.ksnd_schedulers != NULL)
2184                         for (i = 0; i < ksocknal_data.ksnd_nschedulers; i++) {
2185                                 ksock_sched_t *kss =
2186                                         &ksocknal_data.ksnd_schedulers[i];
2187
2188                                 LASSERT (list_empty (&kss->kss_tx_conns));
2189                                 LASSERT (list_empty (&kss->kss_rx_conns));
2190                                 LASSERT (list_empty (&kss->kss_zombie_noop_txs));
2191                                 LASSERT (kss->kss_nconns == 0);
2192                         }
2193
2194                 /* flag threads to terminate; wake and wait for them to die */
2195                 ksocknal_data.ksnd_shuttingdown = 1;
2196                 cfs_waitq_broadcast (&ksocknal_data.ksnd_connd_waitq);
2197                 cfs_waitq_broadcast (&ksocknal_data.ksnd_reaper_waitq);
2198
2199                 if (ksocknal_data.ksnd_schedulers != NULL)
2200                         for (i = 0; i < ksocknal_data.ksnd_nschedulers; i++) {
2201                                 sched = &ksocknal_data.ksnd_schedulers[i];
2202                                 cfs_waitq_broadcast(&sched->kss_waitq);
2203                         }
2204
2205                 i = 4;
2206                 read_lock (&ksocknal_data.ksnd_global_lock);
2207                 while (ksocknal_data.ksnd_nthreads != 0) {
2208                         i++;
2209                         CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET, /* power of 2? */
2210                                "waiting for %d threads to terminate\n",
2211                                 ksocknal_data.ksnd_nthreads);
2212                         read_unlock (&ksocknal_data.ksnd_global_lock);
2213                         cfs_pause(cfs_time_seconds(1));
2214                         read_lock (&ksocknal_data.ksnd_global_lock);
2215                 }
2216                 read_unlock (&ksocknal_data.ksnd_global_lock);
2217
2218                 ksocknal_free_buffers();
2219
2220                 ksocknal_data.ksnd_init = SOCKNAL_INIT_NOTHING;
2221                 break;
2222         }
2223
2224         CDEBUG(D_MALLOC, "after NAL cleanup: kmem %d\n",
2225                atomic_read (&libcfs_kmemory));
2226
2227         PORTAL_MODULE_UNUSE;
2228 }
2229
2230
2231 __u64
2232 ksocknal_new_incarnation (void)
2233 {
2234         struct timeval tv;
2235
2236         /* The incarnation number is the time this module loaded and it
2237          * identifies this particular instance of the socknal.  Hopefully
2238          * we won't be able to reboot more frequently than 1MHz for the
2239          * forseeable future :) */
2240
2241         do_gettimeofday(&tv);
2242
2243         return (((__u64)tv.tv_sec) * 1000000) + tv.tv_usec;
2244 }
2245
2246 int
2247 ksocknal_base_startup (void)
2248 {
2249         int               rc;
2250         int               i;
2251
2252         LASSERT (ksocknal_data.ksnd_init == SOCKNAL_INIT_NOTHING);
2253         LASSERT (ksocknal_data.ksnd_nnets == 0);
2254
2255         memset (&ksocknal_data, 0, sizeof (ksocknal_data)); /* zero pointers */
2256
2257         ksocknal_data.ksnd_peer_hash_size = SOCKNAL_PEER_HASH_SIZE;
2258         LIBCFS_ALLOC (ksocknal_data.ksnd_peers,
2259                       sizeof (struct list_head) * ksocknal_data.ksnd_peer_hash_size);
2260         if (ksocknal_data.ksnd_peers == NULL)
2261                 return -ENOMEM;
2262
2263         for (i = 0; i < ksocknal_data.ksnd_peer_hash_size; i++)
2264                 CFS_INIT_LIST_HEAD(&ksocknal_data.ksnd_peers[i]);
2265
2266         rwlock_init(&ksocknal_data.ksnd_global_lock);
2267
2268         spin_lock_init (&ksocknal_data.ksnd_reaper_lock);
2269         CFS_INIT_LIST_HEAD (&ksocknal_data.ksnd_enomem_conns);
2270         CFS_INIT_LIST_HEAD (&ksocknal_data.ksnd_zombie_conns);
2271         CFS_INIT_LIST_HEAD (&ksocknal_data.ksnd_deathrow_conns);
2272         cfs_waitq_init(&ksocknal_data.ksnd_reaper_waitq);
2273
2274         spin_lock_init (&ksocknal_data.ksnd_connd_lock);
2275         CFS_INIT_LIST_HEAD (&ksocknal_data.ksnd_connd_connreqs);
2276         CFS_INIT_LIST_HEAD (&ksocknal_data.ksnd_connd_routes);
2277         cfs_waitq_init(&ksocknal_data.ksnd_connd_waitq);
2278
2279         spin_lock_init (&ksocknal_data.ksnd_tx_lock);
2280         CFS_INIT_LIST_HEAD (&ksocknal_data.ksnd_idle_noop_txs);
2281
2282         /* NB memset above zeros whole of ksocknal_data, including
2283          * ksocknal_data.ksnd_irqinfo[all].ksni_valid */
2284
2285         /* flag lists/ptrs/locks initialised */
2286         ksocknal_data.ksnd_init = SOCKNAL_INIT_DATA;
2287         PORTAL_MODULE_USE;
2288
2289         ksocknal_data.ksnd_nschedulers = ksocknal_nsched();
2290         LIBCFS_ALLOC(ksocknal_data.ksnd_schedulers,
2291                      sizeof(ksock_sched_t) * ksocknal_data.ksnd_nschedulers);
2292         if (ksocknal_data.ksnd_schedulers == NULL)
2293                 goto failed;
2294
2295         for (i = 0; i < ksocknal_data.ksnd_nschedulers; i++) {
2296                 ksock_sched_t *kss = &ksocknal_data.ksnd_schedulers[i];
2297
2298                 spin_lock_init (&kss->kss_lock);
2299                 CFS_INIT_LIST_HEAD (&kss->kss_rx_conns);
2300                 CFS_INIT_LIST_HEAD (&kss->kss_tx_conns);
2301                 CFS_INIT_LIST_HEAD (&kss->kss_zombie_noop_txs);
2302                 cfs_waitq_init (&kss->kss_waitq);
2303         }
2304
2305         for (i = 0; i < ksocknal_data.ksnd_nschedulers; i++) {
2306                 rc = ksocknal_thread_start (ksocknal_scheduler,
2307                                             &ksocknal_data.ksnd_schedulers[i]);
2308                 if (rc != 0) {
2309                         CERROR("Can't spawn socknal scheduler[%d]: %d\n",
2310                                i, rc);
2311                         goto failed;
2312                 }
2313         }
2314
2315         /* must have at least 2 connds to remain responsive to accepts while
2316          * connecting */
2317         if (*ksocknal_tunables.ksnd_nconnds < 2)
2318                 *ksocknal_tunables.ksnd_nconnds = 2;
2319
2320         for (i = 0; i < *ksocknal_tunables.ksnd_nconnds; i++) {
2321                 rc = ksocknal_thread_start (ksocknal_connd, (void *)((long)i));
2322                 if (rc != 0) {
2323                         CERROR("Can't spawn socknal connd: %d\n", rc);
2324                         goto failed;
2325                 }
2326         }
2327
2328         rc = ksocknal_thread_start (ksocknal_reaper, NULL);
2329         if (rc != 0) {
2330                 CERROR ("Can't spawn socknal reaper: %d\n", rc);
2331                 goto failed;
2332         }
2333
2334         /* flag everything initialised */
2335         ksocknal_data.ksnd_init = SOCKNAL_INIT_ALL;
2336
2337         return 0;
2338
2339  failed:
2340         ksocknal_base_shutdown();
2341         return -ENETDOWN;
2342 }
2343
2344 void
2345 ksocknal_debug_peerhash (lnet_ni_t *ni)
2346 {
2347         ksock_peer_t     *peer = NULL;
2348         struct list_head *tmp;
2349         int               i;
2350
2351         read_lock (&ksocknal_data.ksnd_global_lock);
2352
2353         for (i = 0; i < ksocknal_data.ksnd_peer_hash_size; i++) {
2354                 list_for_each (tmp, &ksocknal_data.ksnd_peers[i]) {
2355                         peer = list_entry (tmp, ksock_peer_t, ksnp_list);
2356
2357                         if (peer->ksnp_ni == ni) break;
2358
2359                         peer = NULL;
2360                 }
2361         }
2362
2363         if (peer != NULL) {
2364                 ksock_route_t *route;
2365                 ksock_conn_t  *conn;
2366
2367                 CWARN ("Active peer on shutdown: %s, ref %d, scnt %d, "
2368                        "closing %d, accepting %d, err %d, zcookie "LPU64", "
2369                        "txq %d, zc_req %d\n", libcfs_id2str(peer->ksnp_id),
2370                        atomic_read(&peer->ksnp_refcount),
2371                        peer->ksnp_sharecount, peer->ksnp_closing,
2372                        peer->ksnp_accepting, peer->ksnp_error,
2373                        peer->ksnp_zc_next_cookie,
2374                        !list_empty(&peer->ksnp_tx_queue),
2375                        !list_empty(&peer->ksnp_zc_req_list));
2376
2377                 list_for_each (tmp, &peer->ksnp_routes) {
2378                         route = list_entry(tmp, ksock_route_t, ksnr_list);
2379                         CWARN ("Route: ref %d, schd %d, conn %d, cnted %d, "
2380                                "del %d\n", atomic_read(&route->ksnr_refcount),
2381                                route->ksnr_scheduled, route->ksnr_connecting,
2382                                route->ksnr_connected, route->ksnr_deleted);
2383                 }
2384
2385                 list_for_each (tmp, &peer->ksnp_conns) {
2386                         conn = list_entry(tmp, ksock_conn_t, ksnc_list);
2387                         CWARN ("Conn: ref %d, sref %d, t %d, c %d\n",
2388                                atomic_read(&conn->ksnc_conn_refcount),
2389                                atomic_read(&conn->ksnc_sock_refcount),
2390                                conn->ksnc_type, conn->ksnc_closing);
2391                 }
2392         }
2393
2394         read_unlock (&ksocknal_data.ksnd_global_lock);
2395         return;
2396 }
2397
2398 void
2399 ksocknal_shutdown (lnet_ni_t *ni)
2400 {
2401         ksock_net_t      *net = ni->ni_data;
2402         int               i;
2403         lnet_process_id_t  anyid = {.nid = LNET_NID_ANY,
2404                                    .pid = LNET_PID_ANY};
2405
2406         LASSERT(ksocknal_data.ksnd_init == SOCKNAL_INIT_ALL);
2407         LASSERT(ksocknal_data.ksnd_nnets > 0);
2408
2409         spin_lock_bh (&net->ksnn_lock);
2410         net->ksnn_shutdown = 1;                 /* prevent new peers */
2411         spin_unlock_bh (&net->ksnn_lock);
2412
2413         /* Delete all peers */
2414         ksocknal_del_peer(ni, anyid, 0);
2415
2416         /* Wait for all peer state to clean up */
2417         i = 2;
2418         spin_lock_bh (&net->ksnn_lock);
2419         while (net->ksnn_npeers != 0) {
2420                 spin_unlock_bh (&net->ksnn_lock);
2421
2422                 i++;
2423                 CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET, /* power of 2? */
2424                        "waiting for %d peers to disconnect\n",
2425                        net->ksnn_npeers);
2426                 cfs_pause(cfs_time_seconds(1));
2427
2428                 ksocknal_debug_peerhash(ni);
2429
2430                 spin_lock_bh (&net->ksnn_lock);
2431         }
2432         spin_unlock_bh (&net->ksnn_lock);
2433
2434         for (i = 0; i < net->ksnn_ninterfaces; i++) {
2435                 LASSERT (net->ksnn_interfaces[i].ksni_npeers == 0);
2436                 LASSERT (net->ksnn_interfaces[i].ksni_nroutes == 0);
2437         }
2438
2439         LIBCFS_FREE(net, sizeof(*net));
2440
2441         ksocknal_data.ksnd_nnets--;
2442         if (ksocknal_data.ksnd_nnets == 0)
2443                 ksocknal_base_shutdown();
2444 }
2445
2446 int
2447 ksocknal_enumerate_interfaces(ksock_net_t *net)
2448 {
2449         char      **names;
2450         int         i;
2451         int         j;
2452         int         rc;
2453         int         n;
2454
2455         n = libcfs_ipif_enumerate(&names);
2456         if (n <= 0) {
2457                 CERROR("Can't enumerate interfaces: %d\n", n);
2458                 return n;
2459         }
2460
2461         for (i = j = 0; i < n; i++) {
2462                 int        up;
2463                 __u32      ip;
2464                 __u32      mask;
2465
2466                 if (!strcmp(names[i], "lo")) /* skip the loopback IF */
2467                         continue;
2468
2469                 rc = libcfs_ipif_query(names[i], &up, &ip, &mask);
2470                 if (rc != 0) {
2471                         CWARN("Can't get interface %s info: %d\n",
2472                               names[i], rc);
2473                         continue;
2474                 }
2475
2476                 if (!up) {
2477                         CWARN("Ignoring interface %s (down)\n",
2478                               names[i]);
2479                         continue;
2480                 }
2481
2482                 if (j == LNET_MAX_INTERFACES) {
2483                         CWARN("Ignoring interface %s (too many interfaces)\n",
2484                               names[i]);
2485                         continue;
2486                 }
2487
2488                 net->ksnn_interfaces[j].ksni_ipaddr = ip;
2489                 net->ksnn_interfaces[j].ksni_netmask = mask;
2490                 j++;
2491         }
2492
2493         libcfs_ipif_free_enumeration(names, n);
2494
2495         if (j == 0)
2496                 CERROR("Can't find any usable interfaces\n");
2497
2498         return j;
2499 }
2500
2501 int
2502 ksocknal_startup (lnet_ni_t *ni)
2503 {
2504         ksock_net_t  *net;
2505         int           rc;
2506         int           i;
2507
2508         LASSERT (ni->ni_lnd == &the_ksocklnd);
2509
2510         if (ksocknal_data.ksnd_init == SOCKNAL_INIT_NOTHING) {
2511                 rc = ksocknal_base_startup();
2512                 if (rc != 0)
2513                         return rc;
2514         }
2515
2516         LIBCFS_ALLOC(net, sizeof(*net));
2517         if (net == NULL)
2518                 goto fail_0;
2519
2520         memset(net, 0, sizeof(*net));
2521         spin_lock_init(&net->ksnn_lock);
2522         net->ksnn_incarnation = ksocknal_new_incarnation();
2523         ni->ni_data = net;
2524         ni->ni_maxtxcredits = *ksocknal_tunables.ksnd_credits;
2525         ni->ni_peertxcredits = *ksocknal_tunables.ksnd_peercredits;
2526
2527         if (ni->ni_interfaces[0] == NULL) {
2528                 rc = ksocknal_enumerate_interfaces(net);
2529                 if (rc <= 0)
2530                         goto fail_1;
2531
2532                 net->ksnn_ninterfaces = 1;
2533         } else {
2534                 for (i = 0; i < LNET_MAX_INTERFACES; i++) {
2535                         int    up;
2536
2537                         if (ni->ni_interfaces[i] == NULL)
2538                                 break;
2539
2540                         rc = libcfs_ipif_query(
2541                                 ni->ni_interfaces[i], &up,
2542                                 &net->ksnn_interfaces[i].ksni_ipaddr,
2543                                 &net->ksnn_interfaces[i].ksni_netmask);
2544
2545                         if (rc != 0) {
2546                                 CERROR("Can't get interface %s info: %d\n",
2547                                        ni->ni_interfaces[i], rc);
2548                                 goto fail_1;
2549                         }
2550
2551                         if (!up) {
2552                                 CERROR("Interface %s is down\n",
2553                                        ni->ni_interfaces[i]);
2554                                 goto fail_1;
2555                         }
2556                 }
2557                 net->ksnn_ninterfaces = i;
2558         }
2559
2560         ni->ni_nid = LNET_MKNID(LNET_NIDNET(ni->ni_nid),
2561                                 net->ksnn_interfaces[0].ksni_ipaddr);
2562
2563         ksocknal_data.ksnd_nnets++;
2564
2565         return 0;
2566
2567  fail_1:
2568         LIBCFS_FREE(net, sizeof(*net));
2569  fail_0:
2570         if (ksocknal_data.ksnd_nnets == 0)
2571                 ksocknal_base_shutdown();
2572
2573         return -ENETDOWN;
2574 }
2575
2576
2577 void __exit
2578 ksocknal_module_fini (void)
2579 {
2580         lnet_unregister_lnd(&the_ksocklnd);
2581         ksocknal_lib_tunables_fini();
2582 }
2583
2584 int __init
2585 ksocknal_module_init (void)
2586 {
2587         int    rc;
2588
2589         /* check ksnr_connected/connecting field large enough */
2590         CLASSERT(SOCKLND_CONN_NTYPES <= 4);
2591
2592         rc = ksocknal_lib_tunables_init();
2593         if (rc != 0)
2594                 return rc;
2595
2596         lnet_register_lnd(&the_ksocklnd);
2597
2598         return 0;
2599 }
2600
2601 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
2602 MODULE_DESCRIPTION("Kernel TCP Socket LND v2.0.0");
2603 MODULE_LICENSE("GPL");
2604
2605 cfs_module(ksocknal, "2.0.0", ksocknal_module_init, ksocknal_module_fini);