lnet/klnds/socklnd/socklnd.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, Whamcloud, Inc.
  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 ksock_nal_data_t        ksocknal_data;
  48
  49 ksock_interface_t *
  50 ksocknal_ip2iface(lnet_ni_t *ni, __u32 ip)
  51 {
  52         ksock_net_t       *net = ni->ni_data;
  53         int                i;
  54         ksock_interface_t *iface;
  55
  56         for (i = 0; i < net->ksnn_ninterfaces; i++) {
  57                 LASSERT(i < LNET_MAX_INTERFACES);
  58                 iface = &net->ksnn_interfaces[i];
  59
  60                 if (iface->ksni_ipaddr == ip)
  61                         return (iface);
  62         }
  63
  64         return (NULL);
  65 }
  66
  67 ksock_route_t *
  68 ksocknal_create_route (__u32 ipaddr, int port)
  69 {
  70         ksock_route_t *route;
  71
  72         LIBCFS_ALLOC (route, sizeof (*route));
  73         if (route == NULL)
  74                 return (NULL);
  75
  76         cfs_atomic_set (&route->ksnr_refcount, 1);
  77         route->ksnr_peer = NULL;
  78         route->ksnr_retry_interval = 0;         /* OK to connect at any time */
  79         route->ksnr_ipaddr = ipaddr;
  80         route->ksnr_port = port;
  81         route->ksnr_scheduled = 0;
  82         route->ksnr_connecting = 0;
  83         route->ksnr_connected = 0;
  84         route->ksnr_deleted = 0;
  85         route->ksnr_conn_count = 0;
  86         route->ksnr_share_count = 0;
  87
  88         return (route);
  89 }
  90
  91 void
  92 ksocknal_destroy_route (ksock_route_t *route)
  93 {
  94         LASSERT (cfs_atomic_read(&route->ksnr_refcount) == 0);
  95
  96         if (route->ksnr_peer != NULL)
  97                 ksocknal_peer_decref(route->ksnr_peer);
  98
  99         LIBCFS_FREE (route, sizeof (*route));
 100 }
 101
 102 int
 103 ksocknal_create_peer (ksock_peer_t **peerp, lnet_ni_t *ni, lnet_process_id_t id)
 104 {
 105         ksock_net_t   *net = ni->ni_data;
 106         ksock_peer_t  *peer;
 107
 108         LASSERT (id.nid != LNET_NID_ANY);
 109         LASSERT (id.pid != LNET_PID_ANY);
 110         LASSERT (!cfs_in_interrupt());
 111
 112         LIBCFS_ALLOC (peer, sizeof (*peer));
 113         if (peer == NULL)
 114                 return -ENOMEM;
 115
 116         memset (peer, 0, sizeof (*peer));       /* NULL pointers/clear flags etc */
 117
 118         peer->ksnp_ni = ni;
 119         peer->ksnp_id = id;
 120         cfs_atomic_set (&peer->ksnp_refcount, 1);   /* 1 ref for caller */
 121         peer->ksnp_closing = 0;
 122         peer->ksnp_accepting = 0;
 123         peer->ksnp_proto = NULL;
 124         peer->ksnp_last_alive = 0;
 125         peer->ksnp_zc_next_cookie = SOCKNAL_KEEPALIVE_PING + 1;
 126
 127         CFS_INIT_LIST_HEAD (&peer->ksnp_conns);
 128         CFS_INIT_LIST_HEAD (&peer->ksnp_routes);
 129         CFS_INIT_LIST_HEAD (&peer->ksnp_tx_queue);
 130         CFS_INIT_LIST_HEAD (&peer->ksnp_zc_req_list);
 131         spin_lock_init(&peer->ksnp_lock);
 132
 133         spin_lock_bh(&net->ksnn_lock);
 134
 135         if (net->ksnn_shutdown) {
 136                 spin_unlock_bh(&net->ksnn_lock);
 137
 138                 LIBCFS_FREE(peer, sizeof(*peer));
 139                 CERROR("Can't create peer: network shutdown\n");
 140                 return -ESHUTDOWN;
 141         }
 142
 143         net->ksnn_npeers++;
 144
 145         spin_unlock_bh(&net->ksnn_lock);
 146
 147         *peerp = peer;
 148         return 0;
 149 }
 150
 151 void
 152 ksocknal_destroy_peer (ksock_peer_t *peer)
 153 {
 154         ksock_net_t    *net = peer->ksnp_ni->ni_data;
 155
 156         CDEBUG (D_NET, "peer %s %p deleted\n",
 157                 libcfs_id2str(peer->ksnp_id), peer);
 158
 159         LASSERT (cfs_atomic_read (&peer->ksnp_refcount) == 0);
 160         LASSERT (peer->ksnp_accepting == 0);
 161         LASSERT (cfs_list_empty (&peer->ksnp_conns));
 162         LASSERT (cfs_list_empty (&peer->ksnp_routes));
 163         LASSERT (cfs_list_empty (&peer->ksnp_tx_queue));
 164         LASSERT (cfs_list_empty (&peer->ksnp_zc_req_list));
 165
 166         LIBCFS_FREE (peer, sizeof (*peer));
 167
 168         /* NB a peer's connections and routes keep a reference on their peer
 169          * until they are destroyed, so we can be assured that _all_ state to
 170          * do with this peer has been cleaned up when its refcount drops to
 171          * zero. */
 172         spin_lock_bh(&net->ksnn_lock);
 173         net->ksnn_npeers--;
 174         spin_unlock_bh(&net->ksnn_lock);
 175 }
 176
 177 ksock_peer_t *
 178 ksocknal_find_peer_locked (lnet_ni_t *ni, lnet_process_id_t id)
 179 {
 180         cfs_list_t       *peer_list = ksocknal_nid2peerlist(id.nid);
 181         cfs_list_t       *tmp;
 182         ksock_peer_t     *peer;
 183
 184         cfs_list_for_each (tmp, peer_list) {
 185
 186                 peer = cfs_list_entry (tmp, ksock_peer_t, ksnp_list);
 187
 188                 LASSERT (!peer->ksnp_closing);
 189
 190                 if (peer->ksnp_ni != ni)
 191                         continue;
 192
 193                 if (peer->ksnp_id.nid != id.nid ||
 194                     peer->ksnp_id.pid != id.pid)
 195                         continue;
 196
 197                 CDEBUG(D_NET, "got peer [%p] -> %s (%d)\n",
 198                        peer, libcfs_id2str(id),
 199                        cfs_atomic_read(&peer->ksnp_refcount));
 200                 return (peer);
 201         }
 202         return (NULL);
 203 }
 204
 205 ksock_peer_t *
 206 ksocknal_find_peer (lnet_ni_t *ni, lnet_process_id_t id)
 207 {
 208         ksock_peer_t     *peer;
 209
 210         read_lock(&ksocknal_data.ksnd_global_lock);
 211         peer = ksocknal_find_peer_locked(ni, id);
 212         if (peer != NULL)                       /* +1 ref for caller? */
 213                 ksocknal_peer_addref(peer);
 214         read_unlock(&ksocknal_data.ksnd_global_lock);
 215
 216         return (peer);
 217 }
 218
 219 void
 220 ksocknal_unlink_peer_locked (ksock_peer_t *peer)
 221 {
 222         int                i;
 223         __u32              ip;
 224         ksock_interface_t *iface;
 225
 226         for (i = 0; i < peer->ksnp_n_passive_ips; i++) {
 227                 LASSERT (i < LNET_MAX_INTERFACES);
 228                 ip = peer->ksnp_passive_ips[i];
 229
 230                 iface = ksocknal_ip2iface(peer->ksnp_ni, ip);
 231                 /* All IPs in peer->ksnp_passive_ips[] come from the
 232                  * interface list, therefore the call must succeed. */
 233                 LASSERT (iface != NULL);
 234
 235                 CDEBUG(D_NET, "peer=%p iface=%p ksni_nroutes=%d\n",
 236                        peer, iface, iface->ksni_nroutes);
 237                 iface->ksni_npeers--;
 238         }
 239
 240         LASSERT (cfs_list_empty(&peer->ksnp_conns));
 241         LASSERT (cfs_list_empty(&peer->ksnp_routes));
 242         LASSERT (!peer->ksnp_closing);
 243         peer->ksnp_closing = 1;
 244         cfs_list_del (&peer->ksnp_list);
 245         /* lose peerlist's ref */
 246         ksocknal_peer_decref(peer);
 247 }
 248
 249 int
 250 ksocknal_get_peer_info (lnet_ni_t *ni, int index,
 251                         lnet_process_id_t *id, __u32 *myip, __u32 *peer_ip,
 252                         int *port, int *conn_count, int *share_count)
 253 {
 254         ksock_peer_t      *peer;
 255         cfs_list_t        *ptmp;
 256         ksock_route_t     *route;
 257         cfs_list_t        *rtmp;
 258         int                i;
 259         int                j;
 260         int                rc = -ENOENT;
 261
 262         read_lock(&ksocknal_data.ksnd_global_lock);
 263
 264         for (i = 0; i < ksocknal_data.ksnd_peer_hash_size; i++) {
 265
 266                 cfs_list_for_each (ptmp, &ksocknal_data.ksnd_peers[i]) {
 267                         peer = cfs_list_entry (ptmp, ksock_peer_t, ksnp_list);
 268
 269                         if (peer->ksnp_ni != ni)
 270                                 continue;
 271
 272                         if (peer->ksnp_n_passive_ips == 0 &&
 273                             cfs_list_empty(&peer->ksnp_routes)) {
 274                                 if (index-- > 0)
 275                                         continue;
 276
 277                                 *id = peer->ksnp_id;
 278                                 *myip = 0;
 279                                 *peer_ip = 0;
 280                                 *port = 0;
 281                                 *conn_count = 0;
 282                                 *share_count = 0;
 283                                 rc = 0;
 284                                 goto out;
 285                         }
 286
 287                         for (j = 0; j < peer->ksnp_n_passive_ips; j++) {
 288                                 if (index-- > 0)
 289                                         continue;
 290
 291                                 *id = peer->ksnp_id;
 292                                 *myip = peer->ksnp_passive_ips[j];
 293                                 *peer_ip = 0;
 294                                 *port = 0;
 295                                 *conn_count = 0;
 296                                 *share_count = 0;
 297                                 rc = 0;
 298                                 goto out;
 299                         }
 300
 301                         cfs_list_for_each (rtmp, &peer->ksnp_routes) {
 302                                 if (index-- > 0)
 303                                         continue;
 304
 305                                 route = cfs_list_entry(rtmp, ksock_route_t,
 306                                                        ksnr_list);
 307
 308                                 *id = peer->ksnp_id;
 309                                 *myip = route->ksnr_myipaddr;
 310                                 *peer_ip = route->ksnr_ipaddr;
 311                                 *port = route->ksnr_port;
 312                                 *conn_count = route->ksnr_conn_count;
 313                                 *share_count = route->ksnr_share_count;
 314                                 rc = 0;
 315                                 goto out;
 316                         }
 317                 }
 318         }
 319  out:
 320         read_unlock(&ksocknal_data.ksnd_global_lock);
 321         return (rc);
 322 }
 323
 324 void
 325 ksocknal_associate_route_conn_locked(ksock_route_t *route, ksock_conn_t *conn)
 326 {
 327         ksock_peer_t      *peer = route->ksnr_peer;
 328         int                type = conn->ksnc_type;
 329         ksock_interface_t *iface;
 330
 331         conn->ksnc_route = route;
 332         ksocknal_route_addref(route);
 333
 334         if (route->ksnr_myipaddr != conn->ksnc_myipaddr) {
 335                 if (route->ksnr_myipaddr == 0) {
 336                         /* route wasn't bound locally yet (the initial route) */
 337                         CDEBUG(D_NET, "Binding %s %u.%u.%u.%u to %u.%u.%u.%u\n",
 338                                libcfs_id2str(peer->ksnp_id),
 339                                HIPQUAD(route->ksnr_ipaddr),
 340                                HIPQUAD(conn->ksnc_myipaddr));
 341                 } else {
 342                         CDEBUG(D_NET, "Rebinding %s %u.%u.%u.%u from "
 343                                "%u.%u.%u.%u to %u.%u.%u.%u\n",
 344                                libcfs_id2str(peer->ksnp_id),
 345                                HIPQUAD(route->ksnr_ipaddr),
 346                                HIPQUAD(route->ksnr_myipaddr),
 347                                HIPQUAD(conn->ksnc_myipaddr));
 348
 349                         iface = ksocknal_ip2iface(route->ksnr_peer->ksnp_ni,
 350                                                   route->ksnr_myipaddr);
 351                         if (iface != NULL)
 352                                 iface->ksni_nroutes--;
 353                 }
 354                 route->ksnr_myipaddr = conn->ksnc_myipaddr;
 355                 iface = ksocknal_ip2iface(route->ksnr_peer->ksnp_ni,
 356                                           route->ksnr_myipaddr);
 357                 if (iface != NULL)
 358                         iface->ksni_nroutes++;
 359         }
 360
 361         route->ksnr_connected |= (1<<type);
 362         route->ksnr_conn_count++;
 363
 364         /* Successful connection => further attempts can
 365          * proceed immediately */
 366         route->ksnr_retry_interval = 0;
 367 }
 368
 369 void
 370 ksocknal_add_route_locked (ksock_peer_t *peer, ksock_route_t *route)
 371 {
 372         cfs_list_t        *tmp;
 373         ksock_conn_t      *conn;
 374         ksock_route_t     *route2;
 375
 376         LASSERT (!peer->ksnp_closing);
 377         LASSERT (route->ksnr_peer == NULL);
 378         LASSERT (!route->ksnr_scheduled);
 379         LASSERT (!route->ksnr_connecting);
 380         LASSERT (route->ksnr_connected == 0);
 381
 382         /* LASSERT(unique) */
 383         cfs_list_for_each(tmp, &peer->ksnp_routes) {
 384                 route2 = cfs_list_entry(tmp, ksock_route_t, ksnr_list);
 385
 386                 if (route2->ksnr_ipaddr == route->ksnr_ipaddr) {
 387                         CERROR ("Duplicate route %s %u.%u.%u.%u\n",
 388                                 libcfs_id2str(peer->ksnp_id),
 389                                 HIPQUAD(route->ksnr_ipaddr));
 390                         LBUG();
 391                 }
 392         }
 393
 394         route->ksnr_peer = peer;
 395         ksocknal_peer_addref(peer);
 396         /* peer's routelist takes over my ref on 'route' */
 397         cfs_list_add_tail(&route->ksnr_list, &peer->ksnp_routes);
 398
 399         cfs_list_for_each(tmp, &peer->ksnp_conns) {
 400                 conn = cfs_list_entry(tmp, ksock_conn_t, ksnc_list);
 401
 402                 if (conn->ksnc_ipaddr != route->ksnr_ipaddr)
 403                         continue;
 404
 405                 ksocknal_associate_route_conn_locked(route, conn);
 406                 /* keep going (typed routes) */
 407         }
 408 }
 409
 410 void
 411 ksocknal_del_route_locked (ksock_route_t *route)
 412 {
 413         ksock_peer_t      *peer = route->ksnr_peer;
 414         ksock_interface_t *iface;
 415         ksock_conn_t      *conn;
 416         cfs_list_t        *ctmp;
 417         cfs_list_t        *cnxt;
 418
 419         LASSERT (!route->ksnr_deleted);
 420
 421         /* Close associated conns */
 422         cfs_list_for_each_safe (ctmp, cnxt, &peer->ksnp_conns) {
 423                 conn = cfs_list_entry(ctmp, ksock_conn_t, ksnc_list);
 424
 425                 if (conn->ksnc_route != route)
 426                         continue;
 427
 428                 ksocknal_close_conn_locked (conn, 0);
 429         }
 430
 431         if (route->ksnr_myipaddr != 0) {
 432                 iface = ksocknal_ip2iface(route->ksnr_peer->ksnp_ni,
 433                                           route->ksnr_myipaddr);
 434                 if (iface != NULL)
 435                         iface->ksni_nroutes--;
 436         }
 437
 438         route->ksnr_deleted = 1;
 439         cfs_list_del (&route->ksnr_list);
 440         ksocknal_route_decref(route);             /* drop peer's ref */
 441
 442         if (cfs_list_empty (&peer->ksnp_routes) &&
 443             cfs_list_empty (&peer->ksnp_conns)) {
 444                 /* I've just removed the last route to a peer with no active
 445                  * connections */
 446                 ksocknal_unlink_peer_locked (peer);
 447         }
 448 }
 449
 450 int
 451 ksocknal_add_peer (lnet_ni_t *ni, lnet_process_id_t id, __u32 ipaddr, int port)
 452 {
 453         cfs_list_t        *tmp;
 454         ksock_peer_t      *peer;
 455         ksock_peer_t      *peer2;
 456         ksock_route_t     *route;
 457         ksock_route_t     *route2;
 458         int                rc;
 459
 460         if (id.nid == LNET_NID_ANY ||
 461             id.pid == LNET_PID_ANY)
 462                 return (-EINVAL);
 463
 464         /* Have a brand new peer ready... */
 465         rc = ksocknal_create_peer(&peer, ni, id);
 466         if (rc != 0)
 467                 return rc;
 468
 469         route = ksocknal_create_route (ipaddr, port);
 470         if (route == NULL) {
 471                 ksocknal_peer_decref(peer);
 472                 return (-ENOMEM);
 473         }
 474
 475         write_lock_bh(&ksocknal_data.ksnd_global_lock);
 476
 477         /* always called with a ref on ni, so shutdown can't have started */
 478         LASSERT (((ksock_net_t *) ni->ni_data)->ksnn_shutdown == 0);
 479
 480         peer2 = ksocknal_find_peer_locked (ni, id);
 481         if (peer2 != NULL) {
 482                 ksocknal_peer_decref(peer);
 483                 peer = peer2;
 484         } else {
 485                 /* peer table takes my ref on peer */
 486                 cfs_list_add_tail (&peer->ksnp_list,
 487                                    ksocknal_nid2peerlist (id.nid));
 488         }
 489
 490         route2 = NULL;
 491         cfs_list_for_each (tmp, &peer->ksnp_routes) {
 492                 route2 = cfs_list_entry(tmp, ksock_route_t, ksnr_list);
 493
 494                 if (route2->ksnr_ipaddr == ipaddr)
 495                         break;
 496
 497                 route2 = NULL;
 498         }
 499         if (route2 == NULL) {
 500                 ksocknal_add_route_locked(peer, route);
 501                 route->ksnr_share_count++;
 502         } else {
 503                 ksocknal_route_decref(route);
 504                 route2->ksnr_share_count++;
 505         }
 506
 507         write_unlock_bh(&ksocknal_data.ksnd_global_lock);
 508
 509         return (0);
 510 }
 511
 512 void
 513 ksocknal_del_peer_locked (ksock_peer_t *peer, __u32 ip)
 514 {
 515         ksock_conn_t     *conn;
 516         ksock_route_t    *route;
 517         cfs_list_t       *tmp;
 518         cfs_list_t       *nxt;
 519         int               nshared;
 520
 521         LASSERT (!peer->ksnp_closing);
 522
 523         /* Extra ref prevents peer disappearing until I'm done with it */
 524         ksocknal_peer_addref(peer);
 525
 526         cfs_list_for_each_safe (tmp, nxt, &peer->ksnp_routes) {
 527                 route = cfs_list_entry(tmp, ksock_route_t, ksnr_list);
 528
 529                 /* no match */
 530                 if (!(ip == 0 || route->ksnr_ipaddr == ip))
 531                         continue;
 532
 533                 route->ksnr_share_count = 0;
 534                 /* This deletes associated conns too */
 535                 ksocknal_del_route_locked (route);
 536         }
 537
 538         nshared = 0;
 539         cfs_list_for_each_safe (tmp, nxt, &peer->ksnp_routes) {
 540                 route = cfs_list_entry(tmp, ksock_route_t, ksnr_list);
 541                 nshared += route->ksnr_share_count;
 542         }
 543
 544         if (nshared == 0) {
 545                 /* remove everything else if there are no explicit entries
 546                  * left */
 547
 548                 cfs_list_for_each_safe (tmp, nxt, &peer->ksnp_routes) {
 549                         route = cfs_list_entry(tmp, ksock_route_t, ksnr_list);
 550
 551                         /* we should only be removing auto-entries */
 552                         LASSERT(route->ksnr_share_count == 0);
 553                         ksocknal_del_route_locked (route);
 554                 }
 555
 556                 cfs_list_for_each_safe (tmp, nxt, &peer->ksnp_conns) {
 557                         conn = cfs_list_entry(tmp, ksock_conn_t, ksnc_list);
 558
 559                         ksocknal_close_conn_locked(conn, 0);
 560                 }
 561         }
 562
 563         ksocknal_peer_decref(peer);
 564         /* NB peer unlinks itself when last conn/route is removed */
 565 }
 566
 567 int
 568 ksocknal_del_peer (lnet_ni_t *ni, lnet_process_id_t id, __u32 ip)
 569 {
 570         CFS_LIST_HEAD     (zombies);
 571         cfs_list_t        *ptmp;
 572         cfs_list_t        *pnxt;
 573         ksock_peer_t      *peer;
 574         int                lo;
 575         int                hi;
 576         int                i;
 577         int                rc = -ENOENT;
 578
 579         write_lock_bh(&ksocknal_data.ksnd_global_lock);
 580
 581         if (id.nid != LNET_NID_ANY)
 582                 lo = hi = (int)(ksocknal_nid2peerlist(id.nid) - ksocknal_data.ksnd_peers);
 583         else {
 584                 lo = 0;
 585                 hi = ksocknal_data.ksnd_peer_hash_size - 1;
 586         }
 587
 588         for (i = lo; i <= hi; i++) {
 589                 cfs_list_for_each_safe (ptmp, pnxt,
 590                                         &ksocknal_data.ksnd_peers[i]) {
 591                         peer = cfs_list_entry (ptmp, ksock_peer_t, ksnp_list);
 592
 593                         if (peer->ksnp_ni != ni)
 594                                 continue;
 595
 596                         if (!((id.nid == LNET_NID_ANY || peer->ksnp_id.nid == id.nid) &&
 597                               (id.pid == LNET_PID_ANY || peer->ksnp_id.pid == id.pid)))
 598                                 continue;
 599
 600                         ksocknal_peer_addref(peer);     /* a ref for me... */
 601
 602                         ksocknal_del_peer_locked (peer, ip);
 603
 604                         if (peer->ksnp_closing &&
 605                             !cfs_list_empty(&peer->ksnp_tx_queue)) {
 606                                 LASSERT (cfs_list_empty(&peer->ksnp_conns));
 607                                 LASSERT (cfs_list_empty(&peer->ksnp_routes));
 608
 609                                 cfs_list_splice_init(&peer->ksnp_tx_queue,
 610                                                      &zombies);
 611                         }
 612
 613                         ksocknal_peer_decref(peer);     /* ...till here */
 614
 615                         rc = 0;                 /* matched! */
 616                 }
 617         }
 618
 619         write_unlock_bh(&ksocknal_data.ksnd_global_lock);
 620
 621         ksocknal_txlist_done(ni, &zombies, 1);
 622
 623         return (rc);
 624 }
 625
 626 ksock_conn_t *
 627 ksocknal_get_conn_by_idx (lnet_ni_t *ni, int index)
 628 {
 629         ksock_peer_t      *peer;
 630         cfs_list_t        *ptmp;
 631         ksock_conn_t      *conn;
 632         cfs_list_t        *ctmp;
 633         int                i;
 634
 635         read_lock(&ksocknal_data.ksnd_global_lock);
 636
 637         for (i = 0; i < ksocknal_data.ksnd_peer_hash_size; i++) {
 638                 cfs_list_for_each (ptmp, &ksocknal_data.ksnd_peers[i]) {
 639                         peer = cfs_list_entry (ptmp, ksock_peer_t, ksnp_list);
 640
 641                         LASSERT (!peer->ksnp_closing);
 642
 643                         if (peer->ksnp_ni != ni)
 644                                 continue;
 645
 646                         cfs_list_for_each (ctmp, &peer->ksnp_conns) {
 647                                 if (index-- > 0)
 648                                         continue;
 649
 650                                 conn = cfs_list_entry (ctmp, ksock_conn_t,
 651                                                        ksnc_list);
 652                                 ksocknal_conn_addref(conn);
 653                                 read_unlock(&ksocknal_data. \
 654                                                  ksnd_global_lock);
 655                                 return (conn);
 656                         }
 657                 }
 658         }
 659
 660         read_unlock(&ksocknal_data.ksnd_global_lock);
 661         return (NULL);
 662 }
 663
 664 ksock_sched_t *
 665 ksocknal_choose_scheduler_locked(unsigned int cpt)
 666 {
 667         struct ksock_sched_info *info = ksocknal_data.ksnd_sched_info[cpt];
 668         ksock_sched_t           *sched;
 669         int                     i;
 670
 671         LASSERT(info->ksi_nthreads > 0);
 672
 673         sched = &info->ksi_scheds[0];
 674         /*
 675          * NB: it's safe so far, but info->ksi_nthreads could be changed
 676          * at runtime when we have dynamic LNet configuration, then we
 677          * need to take care of this.
 678          */
 679         for (i = 1; i < info->ksi_nthreads; i++) {
 680                 if (sched->kss_nconns > info->ksi_scheds[i].kss_nconns)
 681                         sched = &info->ksi_scheds[i];
 682         }
 683
 684         return sched;
 685 }
 686
 687 int
 688 ksocknal_local_ipvec (lnet_ni_t *ni, __u32 *ipaddrs)
 689 {
 690         ksock_net_t       *net = ni->ni_data;
 691         int                i;
 692         int                nip;
 693
 694         read_lock(&ksocknal_data.ksnd_global_lock);
 695
 696         nip = net->ksnn_ninterfaces;
 697         LASSERT (nip <= LNET_MAX_INTERFACES);
 698
 699         /* Only offer interfaces for additional connections if I have
 700          * more than one. */
 701         if (nip < 2) {
 702                 read_unlock(&ksocknal_data.ksnd_global_lock);
 703                 return 0;
 704         }
 705
 706         for (i = 0; i < nip; i++) {
 707                 ipaddrs[i] = net->ksnn_interfaces[i].ksni_ipaddr;
 708                 LASSERT (ipaddrs[i] != 0);
 709         }
 710
 711         read_unlock(&ksocknal_data.ksnd_global_lock);
 712         return (nip);
 713 }
 714
 715 int
 716 ksocknal_match_peerip (ksock_interface_t *iface, __u32 *ips, int nips)
 717 {
 718         int   best_netmatch = 0;
 719         int   best_xor      = 0;
 720         int   best          = -1;
 721         int   this_xor;
 722         int   this_netmatch;
 723         int   i;
 724
 725         for (i = 0; i < nips; i++) {
 726                 if (ips[i] == 0)
 727                         continue;
 728
 729                 this_xor = (ips[i] ^ iface->ksni_ipaddr);
 730                 this_netmatch = ((this_xor & iface->ksni_netmask) == 0) ? 1 : 0;
 731
 732                 if (!(best < 0 ||
 733                       best_netmatch < this_netmatch ||
 734                       (best_netmatch == this_netmatch &&
 735                        best_xor > this_xor)))
 736                         continue;
 737
 738                 best = i;
 739                 best_netmatch = this_netmatch;
 740                 best_xor = this_xor;
 741         }
 742
 743         LASSERT (best >= 0);
 744         return (best);
 745 }
 746
 747 int
 748 ksocknal_select_ips(ksock_peer_t *peer, __u32 *peerips, int n_peerips)
 749 {
 750         rwlock_t                *global_lock = &ksocknal_data.ksnd_global_lock;
 751         ksock_net_t        *net = peer->ksnp_ni->ni_data;
 752         ksock_interface_t  *iface;
 753         ksock_interface_t  *best_iface;
 754         int                 n_ips;
 755         int                 i;
 756         int                 j;
 757         int                 k;
 758         __u32               ip;
 759         __u32               xor;
 760         int                 this_netmatch;
 761         int                 best_netmatch;
 762         int                 best_npeers;
 763
 764         /* CAVEAT EMPTOR: We do all our interface matching with an
 765          * exclusive hold of global lock at IRQ priority.  We're only
 766          * expecting to be dealing with small numbers of interfaces, so the
 767          * O(n**3)-ness shouldn't matter */
 768
 769         /* Also note that I'm not going to return more than n_peerips
 770          * interfaces, even if I have more myself */
 771
 772         write_lock_bh(global_lock);
 773
 774         LASSERT (n_peerips <= LNET_MAX_INTERFACES);
 775         LASSERT (net->ksnn_ninterfaces <= LNET_MAX_INTERFACES);
 776
 777         /* Only match interfaces for additional connections
 778          * if I have > 1 interface */
 779         n_ips = (net->ksnn_ninterfaces < 2) ? 0 :
 780                 MIN(n_peerips, net->ksnn_ninterfaces);
 781
 782         for (i = 0; peer->ksnp_n_passive_ips < n_ips; i++) {
 783                 /*              ^ yes really... */
 784
 785                 /* If we have any new interfaces, first tick off all the
 786                  * peer IPs that match old interfaces, then choose new
 787                  * interfaces to match the remaining peer IPS.
 788                  * We don't forget interfaces we've stopped using; we might
 789                  * start using them again... */
 790
 791                 if (i < peer->ksnp_n_passive_ips) {
 792                         /* Old interface. */
 793                         ip = peer->ksnp_passive_ips[i];
 794                         best_iface = ksocknal_ip2iface(peer->ksnp_ni, ip);
 795
 796                         /* peer passive ips are kept up to date */
 797                         LASSERT(best_iface != NULL);
 798                 } else {
 799                         /* choose a new interface */
 800                         LASSERT (i == peer->ksnp_n_passive_ips);
 801
 802                         best_iface = NULL;
 803                         best_netmatch = 0;
 804                         best_npeers = 0;
 805
 806                         for (j = 0; j < net->ksnn_ninterfaces; j++) {
 807                                 iface = &net->ksnn_interfaces[j];
 808                                 ip = iface->ksni_ipaddr;
 809
 810                                 for (k = 0; k < peer->ksnp_n_passive_ips; k++)
 811                                         if (peer->ksnp_passive_ips[k] == ip)
 812                                                 break;
 813
 814                                 if (k < peer->ksnp_n_passive_ips) /* using it already */
 815                                         continue;
 816
 817                                 k = ksocknal_match_peerip(iface, peerips, n_peerips);
 818                                 xor = (ip ^ peerips[k]);
 819                                 this_netmatch = ((xor & iface->ksni_netmask) == 0) ? 1 : 0;
 820
 821                                 if (!(best_iface == NULL ||
 822                                       best_netmatch < this_netmatch ||
 823                                       (best_netmatch == this_netmatch &&
 824                                        best_npeers > iface->ksni_npeers)))
 825                                         continue;
 826
 827                                 best_iface = iface;
 828                                 best_netmatch = this_netmatch;
 829                                 best_npeers = iface->ksni_npeers;
 830                         }
 831
 832                         best_iface->ksni_npeers++;
 833                         ip = best_iface->ksni_ipaddr;
 834                         peer->ksnp_passive_ips[i] = ip;
 835                         peer->ksnp_n_passive_ips = i+1;
 836                 }
 837
 838                 LASSERT (best_iface != NULL);
 839
 840                 /* mark the best matching peer IP used */
 841                 j = ksocknal_match_peerip(best_iface, peerips, n_peerips);
 842                 peerips[j] = 0;
 843         }
 844
 845         /* Overwrite input peer IP addresses */
 846         memcpy(peerips, peer->ksnp_passive_ips, n_ips * sizeof(*peerips));
 847
 848         write_unlock_bh(global_lock);
 849
 850         return (n_ips);
 851 }
 852
 853 void
 854 ksocknal_create_routes(ksock_peer_t *peer, int port,
 855                        __u32 *peer_ipaddrs, int npeer_ipaddrs)
 856 {
 857         ksock_route_t       *newroute = NULL;
 858         rwlock_t                *global_lock = &ksocknal_data.ksnd_global_lock;
 859         lnet_ni_t           *ni = peer->ksnp_ni;
 860         ksock_net_t         *net = ni->ni_data;
 861         cfs_list_t          *rtmp;
 862         ksock_route_t       *route;
 863         ksock_interface_t   *iface;
 864         ksock_interface_t   *best_iface;
 865         int                  best_netmatch;
 866         int                  this_netmatch;
 867         int                  best_nroutes;
 868         int                  i;
 869         int                  j;
 870
 871         /* CAVEAT EMPTOR: We do all our interface matching with an
 872          * exclusive hold of global lock at IRQ priority.  We're only
 873          * expecting to be dealing with small numbers of interfaces, so the
 874          * O(n**3)-ness here shouldn't matter */
 875
 876         write_lock_bh(global_lock);
 877
 878         if (net->ksnn_ninterfaces < 2) {
 879                 /* Only create additional connections
 880                  * if I have > 1 interface */
 881                 write_unlock_bh(global_lock);
 882                 return;
 883         }
 884
 885         LASSERT (npeer_ipaddrs <= LNET_MAX_INTERFACES);
 886
 887         for (i = 0; i < npeer_ipaddrs; i++) {
 888                 if (newroute != NULL) {
 889                         newroute->ksnr_ipaddr = peer_ipaddrs[i];
 890                 } else {
 891                         write_unlock_bh(global_lock);
 892
 893                         newroute = ksocknal_create_route(peer_ipaddrs[i], port);
 894                         if (newroute == NULL)
 895                                 return;
 896
 897                         write_lock_bh(global_lock);
 898                 }
 899
 900                 if (peer->ksnp_closing) {
 901                         /* peer got closed under me */
 902                         break;
 903                 }
 904
 905                 /* Already got a route? */
 906                 route = NULL;
 907                 cfs_list_for_each(rtmp, &peer->ksnp_routes) {
 908                         route = cfs_list_entry(rtmp, ksock_route_t, ksnr_list);
 909
 910                         if (route->ksnr_ipaddr == newroute->ksnr_ipaddr)
 911                                 break;
 912
 913                         route = NULL;
 914                 }
 915                 if (route != NULL)
 916                         continue;
 917
 918                 best_iface = NULL;
 919                 best_nroutes = 0;
 920                 best_netmatch = 0;
 921
 922                 LASSERT (net->ksnn_ninterfaces <= LNET_MAX_INTERFACES);
 923
 924                 /* Select interface to connect from */
 925                 for (j = 0; j < net->ksnn_ninterfaces; j++) {
 926                         iface = &net->ksnn_interfaces[j];
 927
 928                         /* Using this interface already? */
 929                         cfs_list_for_each(rtmp, &peer->ksnp_routes) {
 930                                 route = cfs_list_entry(rtmp, ksock_route_t,
 931                                                        ksnr_list);
 932
 933                                 if (route->ksnr_myipaddr == iface->ksni_ipaddr)
 934                                         break;
 935
 936                                 route = NULL;
 937                         }
 938                         if (route != NULL)
 939                                 continue;
 940
 941                         this_netmatch = (((iface->ksni_ipaddr ^
 942                                            newroute->ksnr_ipaddr) &
 943                                            iface->ksni_netmask) == 0) ? 1 : 0;
 944
 945                         if (!(best_iface == NULL ||
 946                               best_netmatch < this_netmatch ||
 947                               (best_netmatch == this_netmatch &&
 948                                best_nroutes > iface->ksni_nroutes)))
 949                                 continue;
 950
 951                         best_iface = iface;
 952                         best_netmatch = this_netmatch;
 953                         best_nroutes = iface->ksni_nroutes;
 954                 }
 955
 956                 if (best_iface == NULL)
 957                         continue;
 958
 959                 newroute->ksnr_myipaddr = best_iface->ksni_ipaddr;
 960                 best_iface->ksni_nroutes++;
 961
 962                 ksocknal_add_route_locked(peer, newroute);
 963                 newroute = NULL;
 964         }
 965
 966         write_unlock_bh(global_lock);
 967         if (newroute != NULL)
 968                 ksocknal_route_decref(newroute);
 969 }
 970
 971 int
 972 ksocknal_accept (lnet_ni_t *ni, cfs_socket_t *sock)
 973 {
 974         ksock_connreq_t    *cr;
 975         int                 rc;
 976         __u32               peer_ip;
 977         int                 peer_port;
 978
 979         rc = libcfs_sock_getaddr(sock, 1, &peer_ip, &peer_port);
 980         LASSERT (rc == 0);                      /* we succeeded before */
 981
 982         LIBCFS_ALLOC(cr, sizeof(*cr));
 983         if (cr == NULL) {
 984                 LCONSOLE_ERROR_MSG(0x12f, "Dropping connection request from "
 985                                    "%u.%u.%u.%u: memory exhausted\n",
 986                                    HIPQUAD(peer_ip));
 987                 return -ENOMEM;
 988         }
 989
 990         lnet_ni_addref(ni);
 991         cr->ksncr_ni   = ni;
 992         cr->ksncr_sock = sock;
 993
 994         spin_lock_bh(&ksocknal_data.ksnd_connd_lock);
 995
 996         cfs_list_add_tail(&cr->ksncr_list, &ksocknal_data.ksnd_connd_connreqs);
 997         cfs_waitq_signal(&ksocknal_data.ksnd_connd_waitq);
 998
 999         spin_unlock_bh(&ksocknal_data.ksnd_connd_lock);
1000         return 0;
1001 }
1002
1003 int
1004 ksocknal_connecting (ksock_peer_t *peer, __u32 ipaddr)
1005 {
1006         ksock_route_t   *route;
1007
1008         cfs_list_for_each_entry_typed (route, &peer->ksnp_routes,
1009                                        ksock_route_t, ksnr_list) {
1010
1011                 if (route->ksnr_ipaddr == ipaddr)
1012                         return route->ksnr_connecting;
1013         }
1014         return 0;
1015 }
1016
1017 int
1018 ksocknal_create_conn (lnet_ni_t *ni, ksock_route_t *route,
1019                       cfs_socket_t *sock, int type)
1020 {
1021         rwlock_t                *global_lock = &ksocknal_data.ksnd_global_lock;
1022         CFS_LIST_HEAD     (zombies);
1023         lnet_process_id_t  peerid;
1024         cfs_list_t        *tmp;
1025         __u64              incarnation;
1026         ksock_conn_t      *conn;
1027         ksock_conn_t      *conn2;
1028         ksock_peer_t      *peer = NULL;
1029         ksock_peer_t      *peer2;
1030         ksock_sched_t     *sched;
1031         ksock_hello_msg_t *hello;
1032         int                cpt;
1033         ksock_tx_t        *tx;
1034         ksock_tx_t        *txtmp;
1035         int                rc;
1036         int                active;
1037         char              *warn = NULL;
1038
1039         active = (route != NULL);
1040
1041         LASSERT (active == (type != SOCKLND_CONN_NONE));
1042
1043         LIBCFS_ALLOC(conn, sizeof(*conn));
1044         if (conn == NULL) {
1045                 rc = -ENOMEM;
1046                 goto failed_0;
1047         }
1048
1049         memset (conn, 0, sizeof (*conn));
1050
1051         conn->ksnc_peer = NULL;
1052         conn->ksnc_route = NULL;
1053         conn->ksnc_sock = sock;
1054         /* 2 ref, 1 for conn, another extra ref prevents socket
1055          * being closed before establishment of connection */
1056         cfs_atomic_set (&conn->ksnc_sock_refcount, 2);
1057         conn->ksnc_type = type;
1058         ksocknal_lib_save_callback(sock, conn);
1059         cfs_atomic_set (&conn->ksnc_conn_refcount, 1); /* 1 ref for me */
1060
1061         conn->ksnc_rx_ready = 0;
1062         conn->ksnc_rx_scheduled = 0;
1063
1064         CFS_INIT_LIST_HEAD (&conn->ksnc_tx_queue);
1065         conn->ksnc_tx_ready = 0;
1066         conn->ksnc_tx_scheduled = 0;
1067         conn->ksnc_tx_carrier = NULL;
1068         cfs_atomic_set (&conn->ksnc_tx_nob, 0);
1069
1070         LIBCFS_ALLOC(hello, offsetof(ksock_hello_msg_t,
1071                                      kshm_ips[LNET_MAX_INTERFACES]));
1072         if (hello == NULL) {
1073                 rc = -ENOMEM;
1074                 goto failed_1;
1075         }
1076
1077         /* stash conn's local and remote addrs */
1078         rc = ksocknal_lib_get_conn_addrs (conn);
1079         if (rc != 0)
1080                 goto failed_1;
1081
1082         /* Find out/confirm peer's NID and connection type and get the
1083          * vector of interfaces she's willing to let me connect to.
1084          * Passive connections use the listener timeout since the peer sends
1085          * eagerly */
1086
1087         if (active) {
1088                 peer = route->ksnr_peer;
1089                 LASSERT(ni == peer->ksnp_ni);
1090
1091                 /* Active connection sends HELLO eagerly */
1092                 hello->kshm_nips = ksocknal_local_ipvec(ni, hello->kshm_ips);
1093                 peerid = peer->ksnp_id;
1094
1095                 write_lock_bh(global_lock);
1096                 conn->ksnc_proto = peer->ksnp_proto;
1097                 write_unlock_bh(global_lock);
1098
1099                 if (conn->ksnc_proto == NULL) {
1100                          conn->ksnc_proto = &ksocknal_protocol_v3x;
1101 #if SOCKNAL_VERSION_DEBUG
1102                          if (*ksocknal_tunables.ksnd_protocol == 2)
1103                                  conn->ksnc_proto = &ksocknal_protocol_v2x;
1104                          else if (*ksocknal_tunables.ksnd_protocol == 1)
1105                                  conn->ksnc_proto = &ksocknal_protocol_v1x;
1106 #endif
1107                 }
1108
1109                 rc = ksocknal_send_hello (ni, conn, peerid.nid, hello);
1110                 if (rc != 0)
1111                         goto failed_1;
1112         } else {
1113                 peerid.nid = LNET_NID_ANY;
1114                 peerid.pid = LNET_PID_ANY;
1115
1116                 /* Passive, get protocol from peer */
1117                 conn->ksnc_proto = NULL;
1118         }
1119
1120         rc = ksocknal_recv_hello (ni, conn, hello, &peerid, &incarnation);
1121         if (rc < 0)
1122                 goto failed_1;
1123
1124         LASSERT (rc == 0 || active);
1125         LASSERT (conn->ksnc_proto != NULL);
1126         LASSERT (peerid.nid != LNET_NID_ANY);
1127
1128         cpt = lnet_cpt_of_nid(peerid.nid);
1129
1130         if (active) {
1131                 ksocknal_peer_addref(peer);
1132                 write_lock_bh(global_lock);
1133         } else {
1134                 rc = ksocknal_create_peer(&peer, ni, peerid);
1135                 if (rc != 0)
1136                         goto failed_1;
1137
1138                 write_lock_bh(global_lock);
1139
1140                 /* called with a ref on ni, so shutdown can't have started */
1141                 LASSERT (((ksock_net_t *) ni->ni_data)->ksnn_shutdown == 0);
1142
1143                 peer2 = ksocknal_find_peer_locked(ni, peerid);
1144                 if (peer2 == NULL) {
1145                         /* NB this puts an "empty" peer in the peer
1146                          * table (which takes my ref) */
1147                         cfs_list_add_tail(&peer->ksnp_list,
1148                                           ksocknal_nid2peerlist(peerid.nid));
1149                 } else {
1150                         ksocknal_peer_decref(peer);
1151                         peer = peer2;
1152                 }
1153
1154                 /* +1 ref for me */
1155                 ksocknal_peer_addref(peer);
1156                 peer->ksnp_accepting++;
1157
1158                 /* Am I already connecting to this guy?  Resolve in
1159                  * favour of higher NID... */
1160                 if (peerid.nid < ni->ni_nid &&
1161                     ksocknal_connecting(peer, conn->ksnc_ipaddr)) {
1162                         rc = EALREADY;
1163                         warn = "connection race resolution";
1164                         goto failed_2;
1165                 }
1166         }
1167
1168         if (peer->ksnp_closing ||
1169             (active && route->ksnr_deleted)) {
1170                 /* peer/route got closed under me */
1171                 rc = -ESTALE;
1172                 warn = "peer/route removed";
1173                 goto failed_2;
1174         }
1175
1176         if (peer->ksnp_proto == NULL) {
1177                 /* Never connected before.
1178                  * NB recv_hello may have returned EPROTO to signal my peer
1179                  * wants a different protocol than the one I asked for.
1180                  */
1181                 LASSERT (cfs_list_empty(&peer->ksnp_conns));
1182
1183                 peer->ksnp_proto = conn->ksnc_proto;
1184                 peer->ksnp_incarnation = incarnation;
1185         }
1186
1187         if (peer->ksnp_proto != conn->ksnc_proto ||
1188             peer->ksnp_incarnation != incarnation) {
1189                 /* Peer rebooted or I've got the wrong protocol version */
1190                 ksocknal_close_peer_conns_locked(peer, 0, 0);
1191
1192                 peer->ksnp_proto = NULL;
1193                 rc = ESTALE;
1194                 warn = peer->ksnp_incarnation != incarnation ?
1195                        "peer rebooted" :
1196                        "wrong proto version";
1197                 goto failed_2;
1198         }
1199
1200         switch (rc) {
1201         default:
1202                 LBUG();
1203         case 0:
1204                 break;
1205         case EALREADY:
1206                 warn = "lost conn race";
1207                 goto failed_2;
1208         case EPROTO:
1209                 warn = "retry with different protocol version";
1210                 goto failed_2;
1211         }
1212
1213         /* Refuse to duplicate an existing connection, unless this is a
1214          * loopback connection */
1215         if (conn->ksnc_ipaddr != conn->ksnc_myipaddr) {
1216                 cfs_list_for_each(tmp, &peer->ksnp_conns) {
1217                         conn2 = cfs_list_entry(tmp, ksock_conn_t, ksnc_list);
1218
1219                         if (conn2->ksnc_ipaddr != conn->ksnc_ipaddr ||
1220                             conn2->ksnc_myipaddr != conn->ksnc_myipaddr ||
1221                             conn2->ksnc_type != conn->ksnc_type)
1222                                 continue;
1223
1224                         /* Reply on a passive connection attempt so the peer
1225                          * realises we're connected. */
1226                         LASSERT (rc == 0);
1227                         if (!active)
1228                                 rc = EALREADY;
1229
1230                         warn = "duplicate";
1231                         goto failed_2;
1232                 }
1233         }
1234
1235         /* If the connection created by this route didn't bind to the IP
1236          * address the route connected to, the connection/route matching
1237          * code below probably isn't going to work. */
1238         if (active &&
1239             route->ksnr_ipaddr != conn->ksnc_ipaddr) {
1240                 CERROR("Route %s %u.%u.%u.%u connected to %u.%u.%u.%u\n",
1241                        libcfs_id2str(peer->ksnp_id),
1242                        HIPQUAD(route->ksnr_ipaddr),
1243                        HIPQUAD(conn->ksnc_ipaddr));
1244         }
1245
1246         /* Search for a route corresponding to the new connection and
1247          * create an association.  This allows incoming connections created
1248          * by routes in my peer to match my own route entries so I don't
1249          * continually create duplicate routes. */
1250         cfs_list_for_each (tmp, &peer->ksnp_routes) {
1251                 route = cfs_list_entry(tmp, ksock_route_t, ksnr_list);
1252
1253                 if (route->ksnr_ipaddr != conn->ksnc_ipaddr)
1254                         continue;
1255
1256                 ksocknal_associate_route_conn_locked(route, conn);
1257                 break;
1258         }
1259
1260         conn->ksnc_peer = peer;                 /* conn takes my ref on peer */
1261         peer->ksnp_last_alive = cfs_time_current();
1262         peer->ksnp_send_keepalive = 0;
1263         peer->ksnp_error = 0;
1264
1265         sched = ksocknal_choose_scheduler_locked(cpt);
1266         sched->kss_nconns++;
1267         conn->ksnc_scheduler = sched;
1268
1269         conn->ksnc_tx_last_post = cfs_time_current();
1270         /* Set the deadline for the outgoing HELLO to drain */
1271         conn->ksnc_tx_bufnob = libcfs_sock_wmem_queued(sock);
1272         conn->ksnc_tx_deadline = cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
1273         cfs_mb();   /* order with adding to peer's conn list */
1274
1275         cfs_list_add (&conn->ksnc_list, &peer->ksnp_conns);
1276         ksocknal_conn_addref(conn);
1277
1278         ksocknal_new_packet(conn, 0);
1279
1280         conn->ksnc_zc_capable = ksocknal_lib_zc_capable(conn);
1281
1282         /* Take packets blocking for this connection. */
1283         cfs_list_for_each_entry_safe(tx, txtmp, &peer->ksnp_tx_queue, tx_list) {
1284                 if (conn->ksnc_proto->pro_match_tx(conn, tx, tx->tx_nonblk) == SOCKNAL_MATCH_NO)
1285                                 continue;
1286
1287                 cfs_list_del (&tx->tx_list);
1288                 ksocknal_queue_tx_locked (tx, conn);
1289         }
1290
1291         write_unlock_bh(global_lock);
1292
1293         /* We've now got a new connection.  Any errors from here on are just
1294          * like "normal" comms errors and we close the connection normally.
1295          * NB (a) we still have to send the reply HELLO for passive
1296          *        connections,
1297          *    (b) normal I/O on the conn is blocked until I setup and call the
1298          *        socket callbacks.
1299          */
1300
1301         CDEBUG(D_NET, "New conn %s p %d.x %u.%u.%u.%u -> %u.%u.%u.%u/%d"
1302                " incarnation:"LPD64" sched[%d:%d]\n",
1303                libcfs_id2str(peerid), conn->ksnc_proto->pro_version,
1304                HIPQUAD(conn->ksnc_myipaddr), HIPQUAD(conn->ksnc_ipaddr),
1305                conn->ksnc_port, incarnation, cpt,
1306                (int)(sched - &sched->kss_info->ksi_scheds[0]));
1307
1308         if (active) {
1309                 /* additional routes after interface exchange? */
1310                 ksocknal_create_routes(peer, conn->ksnc_port,
1311                                        hello->kshm_ips, hello->kshm_nips);
1312         } else {
1313                 hello->kshm_nips = ksocknal_select_ips(peer, hello->kshm_ips,
1314                                                        hello->kshm_nips);
1315                 rc = ksocknal_send_hello(ni, conn, peerid.nid, hello);
1316         }
1317
1318         LIBCFS_FREE(hello, offsetof(ksock_hello_msg_t,
1319                                     kshm_ips[LNET_MAX_INTERFACES]));
1320
1321         /* setup the socket AFTER I've received hello (it disables
1322          * SO_LINGER).  I might call back to the acceptor who may want
1323          * to send a protocol version response and then close the
1324          * socket; this ensures the socket only tears down after the
1325          * response has been sent. */
1326         if (rc == 0)
1327                 rc = ksocknal_lib_setup_sock(sock);
1328
1329         write_lock_bh(global_lock);
1330
1331         /* NB my callbacks block while I hold ksnd_global_lock */
1332         ksocknal_lib_set_callback(sock, conn);
1333
1334         if (!active)
1335                 peer->ksnp_accepting--;
1336
1337         write_unlock_bh(global_lock);
1338
1339         if (rc != 0) {
1340                 write_lock_bh(global_lock);
1341                 if (!conn->ksnc_closing) {
1342                         /* could be closed by another thread */
1343                         ksocknal_close_conn_locked(conn, rc);
1344                 }
1345                 write_unlock_bh(global_lock);
1346         } else if (ksocknal_connsock_addref(conn) == 0) {
1347                 /* Allow I/O to proceed. */
1348                 ksocknal_read_callback(conn);
1349                 ksocknal_write_callback(conn);
1350                 ksocknal_connsock_decref(conn);
1351         }
1352
1353         ksocknal_connsock_decref(conn);
1354         ksocknal_conn_decref(conn);
1355         return rc;
1356
1357  failed_2:
1358         if (!peer->ksnp_closing &&
1359             cfs_list_empty (&peer->ksnp_conns) &&
1360             cfs_list_empty (&peer->ksnp_routes)) {
1361                 cfs_list_add(&zombies, &peer->ksnp_tx_queue);
1362                 cfs_list_del_init(&peer->ksnp_tx_queue);
1363                 ksocknal_unlink_peer_locked(peer);
1364         }
1365
1366         write_unlock_bh(global_lock);
1367
1368         if (warn != NULL) {
1369                 if (rc < 0)
1370                         CERROR("Not creating conn %s type %d: %s\n",
1371                                libcfs_id2str(peerid), conn->ksnc_type, warn);
1372                 else
1373                         CDEBUG(D_NET, "Not creating conn %s type %d: %s\n",
1374                               libcfs_id2str(peerid), conn->ksnc_type, warn);
1375         }
1376
1377         if (!active) {
1378                 if (rc > 0) {
1379                         /* Request retry by replying with CONN_NONE
1380                          * ksnc_proto has been set already */
1381                         conn->ksnc_type = SOCKLND_CONN_NONE;
1382                         hello->kshm_nips = 0;
1383                         ksocknal_send_hello(ni, conn, peerid.nid, hello);
1384                 }
1385
1386                 write_lock_bh(global_lock);
1387                 peer->ksnp_accepting--;
1388                 write_unlock_bh(global_lock);
1389         }
1390
1391         ksocknal_txlist_done(ni, &zombies, 1);
1392         ksocknal_peer_decref(peer);
1393
1394  failed_1:
1395         if (hello != NULL)
1396                 LIBCFS_FREE(hello, offsetof(ksock_hello_msg_t,
1397                                             kshm_ips[LNET_MAX_INTERFACES]));
1398
1399         LIBCFS_FREE (conn, sizeof(*conn));
1400
1401  failed_0:
1402         libcfs_sock_release(sock);
1403         return rc;
1404 }
1405
1406 void
1407 ksocknal_close_conn_locked (ksock_conn_t *conn, int error)
1408 {
1409         /* This just does the immmediate housekeeping, and queues the
1410          * connection for the reaper to terminate.
1411          * Caller holds ksnd_global_lock exclusively in irq context */
1412         ksock_peer_t      *peer = conn->ksnc_peer;
1413         ksock_route_t     *route;
1414         ksock_conn_t      *conn2;
1415         cfs_list_t        *tmp;
1416
1417         LASSERT (peer->ksnp_error == 0);
1418         LASSERT (!conn->ksnc_closing);
1419         conn->ksnc_closing = 1;
1420
1421         /* ksnd_deathrow_conns takes over peer's ref */
1422         cfs_list_del (&conn->ksnc_list);
1423
1424         route = conn->ksnc_route;
1425         if (route != NULL) {
1426                 /* dissociate conn from route... */
1427                 LASSERT (!route->ksnr_deleted);
1428                 LASSERT ((route->ksnr_connected & (1 << conn->ksnc_type)) != 0);
1429
1430                 conn2 = NULL;
1431                 cfs_list_for_each(tmp, &peer->ksnp_conns) {
1432                         conn2 = cfs_list_entry(tmp, ksock_conn_t, ksnc_list);
1433
1434                         if (conn2->ksnc_route == route &&
1435                             conn2->ksnc_type == conn->ksnc_type)
1436                                 break;
1437
1438                         conn2 = NULL;
1439                 }
1440                 if (conn2 == NULL)
1441                         route->ksnr_connected &= ~(1 << conn->ksnc_type);
1442
1443                 conn->ksnc_route = NULL;
1444
1445 #if 0           /* irrelevent with only eager routes */
1446                 /* make route least favourite */
1447                 cfs_list_del (&route->ksnr_list);
1448                 cfs_list_add_tail (&route->ksnr_list, &peer->ksnp_routes);
1449 #endif
1450                 ksocknal_route_decref(route);     /* drop conn's ref on route */
1451         }
1452
1453         if (cfs_list_empty (&peer->ksnp_conns)) {
1454                 /* No more connections to this peer */
1455
1456                 if (!cfs_list_empty(&peer->ksnp_tx_queue)) {
1457                         ksock_tx_t *tx;
1458
1459                         LASSERT (conn->ksnc_proto == &ksocknal_protocol_v3x);
1460
1461                         /* throw them to the last connection...,
1462                          * these TXs will be send to /dev/null by scheduler */
1463                         cfs_list_for_each_entry(tx, &peer->ksnp_tx_queue,
1464                                                 tx_list)
1465                                 ksocknal_tx_prep(conn, tx);
1466
1467                         spin_lock_bh(&conn->ksnc_scheduler->kss_lock);
1468                         cfs_list_splice_init(&peer->ksnp_tx_queue,
1469                                              &conn->ksnc_tx_queue);
1470                         spin_unlock_bh(&conn->ksnc_scheduler->kss_lock);
1471                 }
1472
1473                 peer->ksnp_proto = NULL;        /* renegotiate protocol version */
1474                 peer->ksnp_error = error;       /* stash last conn close reason */
1475
1476                 if (cfs_list_empty (&peer->ksnp_routes)) {
1477                         /* I've just closed last conn belonging to a
1478                          * peer with no routes to it */
1479                         ksocknal_unlink_peer_locked (peer);
1480                 }
1481         }
1482
1483         spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
1484
1485         cfs_list_add_tail(&conn->ksnc_list,
1486                           &ksocknal_data.ksnd_deathrow_conns);
1487         cfs_waitq_signal(&ksocknal_data.ksnd_reaper_waitq);
1488
1489         spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
1490 }
1491
1492 void
1493 ksocknal_peer_failed (ksock_peer_t *peer)
1494 {
1495         int        notify = 0;
1496         cfs_time_t last_alive = 0;
1497
1498         /* There has been a connection failure or comms error; but I'll only
1499          * tell LNET I think the peer is dead if it's to another kernel and
1500          * there are no connections or connection attempts in existance. */
1501
1502         read_lock(&ksocknal_data.ksnd_global_lock);
1503
1504         if ((peer->ksnp_id.pid & LNET_PID_USERFLAG) == 0 &&
1505             cfs_list_empty(&peer->ksnp_conns) &&
1506             peer->ksnp_accepting == 0 &&
1507             ksocknal_find_connecting_route_locked(peer) == NULL) {
1508                 notify = 1;
1509                 last_alive = peer->ksnp_last_alive;
1510         }
1511
1512         read_unlock(&ksocknal_data.ksnd_global_lock);
1513
1514         if (notify)
1515                 lnet_notify (peer->ksnp_ni, peer->ksnp_id.nid, 0,
1516                              last_alive);
1517 }
1518
1519 void
1520 ksocknal_finalize_zcreq(ksock_conn_t *conn)
1521 {
1522         ksock_peer_t     *peer = conn->ksnc_peer;
1523         ksock_tx_t       *tx;
1524         ksock_tx_t       *tmp;
1525         CFS_LIST_HEAD    (zlist);
1526
1527         /* NB safe to finalize TXs because closing of socket will
1528          * abort all buffered data */
1529         LASSERT (conn->ksnc_sock == NULL);
1530
1531         spin_lock(&peer->ksnp_lock);
1532
1533         cfs_list_for_each_entry_safe_typed(tx, tmp, &peer->ksnp_zc_req_list,
1534                                            ksock_tx_t, tx_zc_list) {
1535                 if (tx->tx_conn != conn)
1536                         continue;
1537
1538                 LASSERT (tx->tx_msg.ksm_zc_cookies[0] != 0);
1539
1540                 tx->tx_msg.ksm_zc_cookies[0] = 0;
1541                 tx->tx_zc_aborted = 1; /* mark it as not-acked */
1542                 cfs_list_del(&tx->tx_zc_list);
1543                 cfs_list_add(&tx->tx_zc_list, &zlist);
1544         }
1545
1546         spin_unlock(&peer->ksnp_lock);
1547
1548         while (!cfs_list_empty(&zlist)) {
1549                 tx = cfs_list_entry(zlist.next, ksock_tx_t, tx_zc_list);
1550
1551                 cfs_list_del(&tx->tx_zc_list);
1552                 ksocknal_tx_decref(tx);
1553         }
1554 }
1555
1556 void
1557 ksocknal_terminate_conn (ksock_conn_t *conn)
1558 {
1559         /* This gets called by the reaper (guaranteed thread context) to
1560          * disengage the socket from its callbacks and close it.
1561          * ksnc_refcount will eventually hit zero, and then the reaper will
1562          * destroy it. */
1563         ksock_peer_t     *peer = conn->ksnc_peer;
1564         ksock_sched_t    *sched = conn->ksnc_scheduler;
1565         int               failed = 0;
1566
1567         LASSERT(conn->ksnc_closing);
1568
1569         /* wake up the scheduler to "send" all remaining packets to /dev/null */
1570         spin_lock_bh(&sched->kss_lock);
1571
1572         /* a closing conn is always ready to tx */
1573         conn->ksnc_tx_ready = 1;
1574
1575         if (!conn->ksnc_tx_scheduled &&
1576             !cfs_list_empty(&conn->ksnc_tx_queue)){
1577                 cfs_list_add_tail (&conn->ksnc_tx_list,
1578                                &sched->kss_tx_conns);
1579                 conn->ksnc_tx_scheduled = 1;
1580                 /* extra ref for scheduler */
1581                 ksocknal_conn_addref(conn);
1582
1583                 cfs_waitq_signal (&sched->kss_waitq);
1584         }
1585
1586         spin_unlock_bh(&sched->kss_lock);
1587
1588         /* serialise with callbacks */
1589         write_lock_bh(&ksocknal_data.ksnd_global_lock);
1590
1591         ksocknal_lib_reset_callback(conn->ksnc_sock, conn);
1592
1593         /* OK, so this conn may not be completely disengaged from its
1594          * scheduler yet, but it _has_ committed to terminate... */
1595         conn->ksnc_scheduler->kss_nconns--;
1596
1597         if (peer->ksnp_error != 0) {
1598                 /* peer's last conn closed in error */
1599                 LASSERT (cfs_list_empty (&peer->ksnp_conns));
1600                 failed = 1;
1601                 peer->ksnp_error = 0;     /* avoid multiple notifications */
1602         }
1603
1604         write_unlock_bh(&ksocknal_data.ksnd_global_lock);
1605
1606         if (failed)
1607                 ksocknal_peer_failed(peer);
1608
1609         /* The socket is closed on the final put; either here, or in
1610          * ksocknal_{send,recv}msg().  Since we set up the linger2 option
1611          * when the connection was established, this will close the socket
1612          * immediately, aborting anything buffered in it. Any hung
1613          * zero-copy transmits will therefore complete in finite time. */
1614         ksocknal_connsock_decref(conn);
1615 }
1616
1617 void
1618 ksocknal_queue_zombie_conn (ksock_conn_t *conn)
1619 {
1620         /* Queue the conn for the reaper to destroy */
1621
1622         LASSERT(cfs_atomic_read(&conn->ksnc_conn_refcount) == 0);
1623         spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
1624
1625         cfs_list_add_tail(&conn->ksnc_list, &ksocknal_data.ksnd_zombie_conns);
1626         cfs_waitq_signal(&ksocknal_data.ksnd_reaper_waitq);
1627
1628         spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
1629 }
1630
1631 void
1632 ksocknal_destroy_conn (ksock_conn_t *conn)
1633 {
1634         cfs_time_t      last_rcv;
1635
1636         /* Final coup-de-grace of the reaper */
1637         CDEBUG (D_NET, "connection %p\n", conn);
1638
1639         LASSERT (cfs_atomic_read (&conn->ksnc_conn_refcount) == 0);
1640         LASSERT (cfs_atomic_read (&conn->ksnc_sock_refcount) == 0);
1641         LASSERT (conn->ksnc_sock == NULL);
1642         LASSERT (conn->ksnc_route == NULL);
1643         LASSERT (!conn->ksnc_tx_scheduled);
1644         LASSERT (!conn->ksnc_rx_scheduled);
1645         LASSERT (cfs_list_empty(&conn->ksnc_tx_queue));
1646
1647         /* complete current receive if any */
1648         switch (conn->ksnc_rx_state) {
1649         case SOCKNAL_RX_LNET_PAYLOAD:
1650                 last_rcv = conn->ksnc_rx_deadline -
1651                            cfs_time_seconds(*ksocknal_tunables.ksnd_timeout);
1652                 CERROR("Completing partial receive from %s[%d]"
1653                        ", ip %d.%d.%d.%d:%d, with error, wanted: %d, left: %d, "
1654                        "last alive is %ld secs ago\n",
1655                        libcfs_id2str(conn->ksnc_peer->ksnp_id), conn->ksnc_type,
1656                        HIPQUAD(conn->ksnc_ipaddr), conn->ksnc_port,
1657                        conn->ksnc_rx_nob_wanted, conn->ksnc_rx_nob_left,
1658                        cfs_duration_sec(cfs_time_sub(cfs_time_current(),
1659                                         last_rcv)));
1660                 lnet_finalize (conn->ksnc_peer->ksnp_ni,
1661                                conn->ksnc_cookie, -EIO);
1662                 break;
1663         case SOCKNAL_RX_LNET_HEADER:
1664                 if (conn->ksnc_rx_started)
1665                         CERROR("Incomplete receive of lnet header from %s"
1666                                ", ip %d.%d.%d.%d:%d, with error, protocol: %d.x.\n",
1667                                libcfs_id2str(conn->ksnc_peer->ksnp_id),
1668                                HIPQUAD(conn->ksnc_ipaddr), conn->ksnc_port,
1669                                conn->ksnc_proto->pro_version);
1670                 break;
1671         case SOCKNAL_RX_KSM_HEADER:
1672                 if (conn->ksnc_rx_started)
1673                         CERROR("Incomplete receive of ksock message from %s"
1674                                ", ip %d.%d.%d.%d:%d, with error, protocol: %d.x.\n",
1675                                libcfs_id2str(conn->ksnc_peer->ksnp_id),
1676                                HIPQUAD(conn->ksnc_ipaddr), conn->ksnc_port,
1677                                conn->ksnc_proto->pro_version);
1678                 break;
1679         case SOCKNAL_RX_SLOP:
1680                 if (conn->ksnc_rx_started)
1681                         CERROR("Incomplete receive of slops from %s"
1682                                ", ip %d.%d.%d.%d:%d, with error\n",
1683                                libcfs_id2str(conn->ksnc_peer->ksnp_id),
1684                                HIPQUAD(conn->ksnc_ipaddr), conn->ksnc_port);
1685                break;
1686         default:
1687                 LBUG ();
1688                 break;
1689         }
1690
1691         ksocknal_peer_decref(conn->ksnc_peer);
1692
1693         LIBCFS_FREE (conn, sizeof (*conn));
1694 }
1695
1696 int
1697 ksocknal_close_peer_conns_locked (ksock_peer_t *peer, __u32 ipaddr, int why)
1698 {
1699         ksock_conn_t       *conn;
1700         cfs_list_t         *ctmp;
1701         cfs_list_t         *cnxt;
1702         int                 count = 0;
1703
1704         cfs_list_for_each_safe (ctmp, cnxt, &peer->ksnp_conns) {
1705                 conn = cfs_list_entry (ctmp, ksock_conn_t, ksnc_list);
1706
1707                 if (ipaddr == 0 ||
1708                     conn->ksnc_ipaddr == ipaddr) {
1709                         count++;
1710                         ksocknal_close_conn_locked (conn, why);
1711                 }
1712         }
1713
1714         return (count);
1715 }
1716
1717 int
1718 ksocknal_close_conn_and_siblings (ksock_conn_t *conn, int why)
1719 {
1720         ksock_peer_t     *peer = conn->ksnc_peer;
1721         __u32             ipaddr = conn->ksnc_ipaddr;
1722         int               count;
1723
1724         write_lock_bh(&ksocknal_data.ksnd_global_lock);
1725
1726         count = ksocknal_close_peer_conns_locked (peer, ipaddr, why);
1727
1728         write_unlock_bh(&ksocknal_data.ksnd_global_lock);
1729
1730         return (count);
1731 }
1732
1733 int
1734 ksocknal_close_matching_conns (lnet_process_id_t id, __u32 ipaddr)
1735 {
1736         ksock_peer_t       *peer;
1737         cfs_list_t         *ptmp;
1738         cfs_list_t         *pnxt;
1739         int                 lo;
1740         int                 hi;
1741         int                 i;
1742         int                 count = 0;
1743
1744         write_lock_bh(&ksocknal_data.ksnd_global_lock);
1745
1746         if (id.nid != LNET_NID_ANY)
1747                 lo = hi = (int)(ksocknal_nid2peerlist(id.nid) - ksocknal_data.ksnd_peers);
1748         else {
1749                 lo = 0;
1750                 hi = ksocknal_data.ksnd_peer_hash_size - 1;
1751         }
1752
1753         for (i = lo; i <= hi; i++) {
1754                 cfs_list_for_each_safe (ptmp, pnxt,
1755                                         &ksocknal_data.ksnd_peers[i]) {
1756
1757                         peer = cfs_list_entry (ptmp, ksock_peer_t, ksnp_list);
1758
1759                         if (!((id.nid == LNET_NID_ANY || id.nid == peer->ksnp_id.nid) &&
1760                               (id.pid == LNET_PID_ANY || id.pid == peer->ksnp_id.pid)))
1761                                 continue;
1762
1763                         count += ksocknal_close_peer_conns_locked (peer, ipaddr, 0);
1764                 }
1765         }
1766
1767         write_unlock_bh(&ksocknal_data.ksnd_global_lock);
1768
1769         /* wildcards always succeed */
1770         if (id.nid == LNET_NID_ANY || id.pid == LNET_PID_ANY || ipaddr == 0)
1771                 return (0);
1772
1773         return (count == 0 ? -ENOENT : 0);
1774 }
1775
1776 void
1777 ksocknal_notify (lnet_ni_t *ni, lnet_nid_t gw_nid, int alive)
1778 {
1779         /* The router is telling me she's been notified of a change in
1780          * gateway state.... */
1781         lnet_process_id_t  id = {0};
1782
1783         id.nid = gw_nid;
1784         id.pid = LNET_PID_ANY;
1785
1786         CDEBUG (D_NET, "gw %s %s\n", libcfs_nid2str(gw_nid),
1787                 alive ? "up" : "down");
1788
1789         if (!alive) {
1790                 /* If the gateway crashed, close all open connections... */
1791                 ksocknal_close_matching_conns (id, 0);
1792                 return;
1793         }
1794
1795         /* ...otherwise do nothing.  We can only establish new connections
1796          * if we have autroutes, and these connect on demand. */
1797 }
1798
1799 void
1800 ksocknal_query (lnet_ni_t *ni, lnet_nid_t nid, cfs_time_t *when)
1801 {
1802         int                connect = 1;
1803         cfs_time_t         last_alive = 0;
1804         cfs_time_t         now = cfs_time_current();
1805         ksock_peer_t      *peer = NULL;
1806         rwlock_t                *glock = &ksocknal_data.ksnd_global_lock;
1807         lnet_process_id_t  id = {.nid = nid, .pid = LUSTRE_SRV_LNET_PID};
1808
1809         read_lock(glock);
1810
1811         peer = ksocknal_find_peer_locked(ni, id);
1812         if (peer != NULL) {
1813                 cfs_list_t       *tmp;
1814                 ksock_conn_t     *conn;
1815                 int               bufnob;
1816
1817                 cfs_list_for_each (tmp, &peer->ksnp_conns) {
1818                         conn = cfs_list_entry(tmp, ksock_conn_t, ksnc_list);
1819                         bufnob = libcfs_sock_wmem_queued(conn->ksnc_sock);
1820
1821                         if (bufnob < conn->ksnc_tx_bufnob) {
1822                                 /* something got ACKed */
1823                                 conn->ksnc_tx_deadline =
1824                                         cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
1825                                 peer->ksnp_last_alive = now;
1826                                 conn->ksnc_tx_bufnob = bufnob;
1827                         }
1828                 }
1829
1830                 last_alive = peer->ksnp_last_alive;
1831                 if (ksocknal_find_connectable_route_locked(peer) == NULL)
1832                         connect = 0;
1833         }
1834
1835         read_unlock(glock);
1836
1837         if (last_alive != 0)
1838                 *when = last_alive;
1839
1840         CDEBUG(D_NET, "Peer %s %p, alive %ld secs ago, connect %d\n",
1841                libcfs_nid2str(nid), peer,
1842                last_alive ? cfs_duration_sec(now - last_alive) : -1,
1843                connect);
1844
1845         if (!connect)
1846                 return;
1847
1848         ksocknal_add_peer(ni, id, LNET_NIDADDR(nid), lnet_acceptor_port());
1849
1850         write_lock_bh(glock);
1851
1852         peer = ksocknal_find_peer_locked(ni, id);
1853         if (peer != NULL)
1854                 ksocknal_launch_all_connections_locked(peer);
1855
1856         write_unlock_bh(glock);
1857         return;
1858 }
1859
1860 void
1861 ksocknal_push_peer (ksock_peer_t *peer)
1862 {
1863         int               index;
1864         int               i;
1865         cfs_list_t       *tmp;
1866         ksock_conn_t     *conn;
1867
1868         for (index = 0; ; index++) {
1869                 read_lock(&ksocknal_data.ksnd_global_lock);
1870
1871                 i = 0;
1872                 conn = NULL;
1873
1874                 cfs_list_for_each (tmp, &peer->ksnp_conns) {
1875                         if (i++ == index) {
1876                                 conn = cfs_list_entry (tmp, ksock_conn_t,
1877                                                        ksnc_list);
1878                                 ksocknal_conn_addref(conn);
1879                                 break;
1880                         }
1881                 }
1882
1883                 read_unlock(&ksocknal_data.ksnd_global_lock);
1884
1885                 if (conn == NULL)
1886                         break;
1887
1888                 ksocknal_lib_push_conn (conn);
1889                 ksocknal_conn_decref(conn);
1890         }
1891 }
1892
1893 int
1894 ksocknal_push (lnet_ni_t *ni, lnet_process_id_t id)
1895 {
1896         ksock_peer_t      *peer;
1897         cfs_list_t        *tmp;
1898         int                index;
1899         int                i;
1900         int                j;
1901         int                rc = -ENOENT;
1902
1903         for (i = 0; i < ksocknal_data.ksnd_peer_hash_size; i++) {
1904                 for (j = 0; ; j++) {
1905                         read_lock(&ksocknal_data.ksnd_global_lock);
1906
1907                         index = 0;
1908                         peer = NULL;
1909
1910                         cfs_list_for_each (tmp, &ksocknal_data.ksnd_peers[i]) {
1911                                 peer = cfs_list_entry(tmp, ksock_peer_t,
1912                                                       ksnp_list);
1913
1914                                 if (!((id.nid == LNET_NID_ANY ||
1915                                        id.nid == peer->ksnp_id.nid) &&
1916                                       (id.pid == LNET_PID_ANY ||
1917                                        id.pid == peer->ksnp_id.pid))) {
1918                                         peer = NULL;
1919                                         continue;
1920                                 }
1921
1922                                 if (index++ == j) {
1923                                         ksocknal_peer_addref(peer);
1924                                         break;
1925                                 }
1926                         }
1927
1928                         read_unlock(&ksocknal_data.ksnd_global_lock);
1929
1930                         if (peer != NULL) {
1931                                 rc = 0;
1932                                 ksocknal_push_peer (peer);
1933                                 ksocknal_peer_decref(peer);
1934                         }
1935                 }
1936
1937         }
1938
1939         return (rc);
1940 }
1941
1942 int
1943 ksocknal_add_interface(lnet_ni_t *ni, __u32 ipaddress, __u32 netmask)
1944 {
1945         ksock_net_t       *net = ni->ni_data;
1946         ksock_interface_t *iface;
1947         int                rc;
1948         int                i;
1949         int                j;
1950         cfs_list_t        *ptmp;
1951         ksock_peer_t      *peer;
1952         cfs_list_t        *rtmp;
1953         ksock_route_t     *route;
1954
1955         if (ipaddress == 0 ||
1956             netmask == 0)
1957                 return (-EINVAL);
1958
1959         write_lock_bh(&ksocknal_data.ksnd_global_lock);
1960
1961         iface = ksocknal_ip2iface(ni, ipaddress);
1962         if (iface != NULL) {
1963                 /* silently ignore dups */
1964                 rc = 0;
1965         } else if (net->ksnn_ninterfaces == LNET_MAX_INTERFACES) {
1966                 rc = -ENOSPC;
1967         } else {
1968                 iface = &net->ksnn_interfaces[net->ksnn_ninterfaces++];
1969
1970                 iface->ksni_ipaddr = ipaddress;
1971                 iface->ksni_netmask = netmask;
1972                 iface->ksni_nroutes = 0;
1973                 iface->ksni_npeers = 0;
1974
1975                 for (i = 0; i < ksocknal_data.ksnd_peer_hash_size; i++) {
1976                         cfs_list_for_each(ptmp, &ksocknal_data.ksnd_peers[i]) {
1977                                 peer = cfs_list_entry(ptmp, ksock_peer_t,
1978                                                       ksnp_list);
1979
1980                                 for (j = 0; j < peer->ksnp_n_passive_ips; j++)
1981                                         if (peer->ksnp_passive_ips[j] == ipaddress)
1982                                                 iface->ksni_npeers++;
1983
1984                                 cfs_list_for_each(rtmp, &peer->ksnp_routes) {
1985                                         route = cfs_list_entry(rtmp,
1986                                                                ksock_route_t,
1987                                                                ksnr_list);
1988
1989                                         if (route->ksnr_myipaddr == ipaddress)
1990                                                 iface->ksni_nroutes++;
1991                                 }
1992                         }
1993                 }
1994
1995                 rc = 0;
1996                 /* NB only new connections will pay attention to the new interface! */
1997         }
1998
1999         write_unlock_bh(&ksocknal_data.ksnd_global_lock);
2000
2001         return (rc);
2002 }
2003
2004 void
2005 ksocknal_peer_del_interface_locked(ksock_peer_t *peer, __u32 ipaddr)
2006 {
2007         cfs_list_t         *tmp;
2008         cfs_list_t         *nxt;
2009         ksock_route_t      *route;
2010         ksock_conn_t       *conn;
2011         int                 i;
2012         int                 j;
2013
2014         for (i = 0; i < peer->ksnp_n_passive_ips; i++)
2015                 if (peer->ksnp_passive_ips[i] == ipaddr) {
2016                         for (j = i+1; j < peer->ksnp_n_passive_ips; j++)
2017                                 peer->ksnp_passive_ips[j-1] =
2018                                         peer->ksnp_passive_ips[j];
2019                         peer->ksnp_n_passive_ips--;
2020                         break;
2021                 }
2022
2023         cfs_list_for_each_safe(tmp, nxt, &peer->ksnp_routes) {
2024                 route = cfs_list_entry (tmp, ksock_route_t, ksnr_list);
2025
2026                 if (route->ksnr_myipaddr != ipaddr)
2027                         continue;
2028
2029                 if (route->ksnr_share_count != 0) {
2030                         /* Manually created; keep, but unbind */
2031                         route->ksnr_myipaddr = 0;
2032                 } else {
2033                         ksocknal_del_route_locked(route);
2034                 }
2035         }
2036
2037         cfs_list_for_each_safe(tmp, nxt, &peer->ksnp_conns) {
2038                 conn = cfs_list_entry(tmp, ksock_conn_t, ksnc_list);
2039
2040                 if (conn->ksnc_myipaddr == ipaddr)
2041                         ksocknal_close_conn_locked (conn, 0);
2042         }
2043 }
2044
2045 int
2046 ksocknal_del_interface(lnet_ni_t *ni, __u32 ipaddress)
2047 {
2048         ksock_net_t       *net = ni->ni_data;
2049         int                rc = -ENOENT;
2050         cfs_list_t        *tmp;
2051         cfs_list_t        *nxt;
2052         ksock_peer_t      *peer;
2053         __u32              this_ip;
2054         int                i;
2055         int                j;
2056
2057         write_lock_bh(&ksocknal_data.ksnd_global_lock);
2058
2059         for (i = 0; i < net->ksnn_ninterfaces; i++) {
2060                 this_ip = net->ksnn_interfaces[i].ksni_ipaddr;
2061
2062                 if (!(ipaddress == 0 ||
2063                       ipaddress == this_ip))
2064                         continue;
2065
2066                 rc = 0;
2067
2068                 for (j = i+1; j < net->ksnn_ninterfaces; j++)
2069                         net->ksnn_interfaces[j-1] =
2070                                 net->ksnn_interfaces[j];
2071
2072                 net->ksnn_ninterfaces--;
2073
2074                 for (j = 0; j < ksocknal_data.ksnd_peer_hash_size; j++) {
2075                         cfs_list_for_each_safe(tmp, nxt,
2076                                                &ksocknal_data.ksnd_peers[j]) {
2077                                 peer = cfs_list_entry(tmp, ksock_peer_t,
2078                                                       ksnp_list);
2079
2080                                 if (peer->ksnp_ni != ni)
2081                                         continue;
2082
2083                                 ksocknal_peer_del_interface_locked(peer, this_ip);
2084                         }
2085                 }
2086         }
2087
2088         write_unlock_bh(&ksocknal_data.ksnd_global_lock);
2089
2090         return (rc);
2091 }
2092
2093 int
2094 ksocknal_ctl(lnet_ni_t *ni, unsigned int cmd, void *arg)
2095 {
2096         lnet_process_id_t id = {0};
2097         struct libcfs_ioctl_data *data = arg;
2098         int rc;
2099
2100         switch(cmd) {
2101         case IOC_LIBCFS_GET_INTERFACE: {
2102                 ksock_net_t       *net = ni->ni_data;
2103                 ksock_interface_t *iface;
2104
2105                 read_lock(&ksocknal_data.ksnd_global_lock);
2106
2107                 if (data->ioc_count >= (__u32)net->ksnn_ninterfaces) {
2108                         rc = -ENOENT;
2109                 } else {
2110                         rc = 0;
2111                         iface = &net->ksnn_interfaces[data->ioc_count];
2112
2113                         data->ioc_u32[0] = iface->ksni_ipaddr;
2114                         data->ioc_u32[1] = iface->ksni_netmask;
2115                         data->ioc_u32[2] = iface->ksni_npeers;
2116                         data->ioc_u32[3] = iface->ksni_nroutes;
2117                 }
2118
2119                 read_unlock(&ksocknal_data.ksnd_global_lock);
2120                 return rc;
2121         }
2122
2123         case IOC_LIBCFS_ADD_INTERFACE:
2124                 return ksocknal_add_interface(ni,
2125                                               data->ioc_u32[0], /* IP address */
2126                                               data->ioc_u32[1]); /* net mask */
2127
2128         case IOC_LIBCFS_DEL_INTERFACE:
2129                 return ksocknal_del_interface(ni,
2130                                               data->ioc_u32[0]); /* IP address */
2131
2132         case IOC_LIBCFS_GET_PEER: {
2133                 __u32            myip = 0;
2134                 __u32            ip = 0;
2135                 int              port = 0;
2136                 int              conn_count = 0;
2137                 int              share_count = 0;
2138
2139                 rc = ksocknal_get_peer_info(ni, data->ioc_count,
2140                                             &id, &myip, &ip, &port,
2141                                             &conn_count,  &share_count);
2142                 if (rc != 0)
2143                         return rc;
2144
2145                 data->ioc_nid    = id.nid;
2146                 data->ioc_count  = share_count;
2147                 data->ioc_u32[0] = ip;
2148                 data->ioc_u32[1] = port;
2149                 data->ioc_u32[2] = myip;
2150                 data->ioc_u32[3] = conn_count;
2151                 data->ioc_u32[4] = id.pid;
2152                 return 0;
2153         }
2154
2155         case IOC_LIBCFS_ADD_PEER:
2156                 id.nid = data->ioc_nid;
2157                 id.pid = LUSTRE_SRV_LNET_PID;
2158                 return ksocknal_add_peer (ni, id,
2159                                           data->ioc_u32[0], /* IP */
2160                                           data->ioc_u32[1]); /* port */
2161
2162         case IOC_LIBCFS_DEL_PEER:
2163                 id.nid = data->ioc_nid;
2164                 id.pid = LNET_PID_ANY;
2165                 return ksocknal_del_peer (ni, id,
2166                                           data->ioc_u32[0]); /* IP */
2167
2168         case IOC_LIBCFS_GET_CONN: {
2169                 int           txmem;
2170                 int           rxmem;
2171                 int           nagle;
2172                 ksock_conn_t *conn = ksocknal_get_conn_by_idx (ni, data->ioc_count);
2173
2174                 if (conn == NULL)
2175                         return -ENOENT;
2176
2177                 ksocknal_lib_get_conn_tunables(conn, &txmem, &rxmem, &nagle);
2178
2179                 data->ioc_count  = txmem;
2180                 data->ioc_nid    = conn->ksnc_peer->ksnp_id.nid;
2181                 data->ioc_flags  = nagle;
2182                 data->ioc_u32[0] = conn->ksnc_ipaddr;
2183                 data->ioc_u32[1] = conn->ksnc_port;
2184                 data->ioc_u32[2] = conn->ksnc_myipaddr;
2185                 data->ioc_u32[3] = conn->ksnc_type;
2186                 data->ioc_u32[4] = conn->ksnc_scheduler->kss_info->ksi_cpt;
2187                 data->ioc_u32[5] = rxmem;
2188                 data->ioc_u32[6] = conn->ksnc_peer->ksnp_id.pid;
2189                 ksocknal_conn_decref(conn);
2190                 return 0;
2191         }
2192
2193         case IOC_LIBCFS_CLOSE_CONNECTION:
2194                 id.nid = data->ioc_nid;
2195                 id.pid = LNET_PID_ANY;
2196                 return ksocknal_close_matching_conns (id,
2197                                                       data->ioc_u32[0]);
2198
2199         case IOC_LIBCFS_REGISTER_MYNID:
2200                 /* Ignore if this is a noop */
2201                 if (data->ioc_nid == ni->ni_nid)
2202                         return 0;
2203
2204                 CERROR("obsolete IOC_LIBCFS_REGISTER_MYNID: %s(%s)\n",
2205                        libcfs_nid2str(data->ioc_nid),
2206                        libcfs_nid2str(ni->ni_nid));
2207                 return -EINVAL;
2208
2209         case IOC_LIBCFS_PUSH_CONNECTION:
2210                 id.nid = data->ioc_nid;
2211                 id.pid = LNET_PID_ANY;
2212                 return ksocknal_push(ni, id);
2213
2214         default:
2215                 return -EINVAL;
2216         }
2217         /* not reached */
2218 }
2219
2220 void
2221 ksocknal_free_buffers (void)
2222 {
2223         LASSERT (cfs_atomic_read(&ksocknal_data.ksnd_nactive_txs) == 0);
2224
2225         if (ksocknal_data.ksnd_sched_info != NULL) {
2226                 struct ksock_sched_info *info;
2227                 int                     i;
2228
2229                 cfs_percpt_for_each(info, i, ksocknal_data.ksnd_sched_info) {
2230                         if (info->ksi_scheds != NULL) {
2231                                 LIBCFS_FREE(info->ksi_scheds,
2232                                             info->ksi_nthreads_max *
2233                                             sizeof(info->ksi_scheds[0]));
2234                         }
2235                 }
2236                 cfs_percpt_free(ksocknal_data.ksnd_sched_info);
2237         }
2238
2239         LIBCFS_FREE (ksocknal_data.ksnd_peers,
2240                      sizeof (cfs_list_t) *
2241                      ksocknal_data.ksnd_peer_hash_size);
2242
2243         spin_lock(&ksocknal_data.ksnd_tx_lock);
2244
2245         if (!cfs_list_empty(&ksocknal_data.ksnd_idle_noop_txs)) {
2246                 cfs_list_t      zlist;
2247                 ksock_tx_t      *tx;
2248
2249                 cfs_list_add(&zlist, &ksocknal_data.ksnd_idle_noop_txs);
2250                 cfs_list_del_init(&ksocknal_data.ksnd_idle_noop_txs);
2251                 spin_unlock(&ksocknal_data.ksnd_tx_lock);
2252
2253                 while (!cfs_list_empty(&zlist)) {
2254                         tx = cfs_list_entry(zlist.next, ksock_tx_t, tx_list);
2255                         cfs_list_del(&tx->tx_list);
2256                         LIBCFS_FREE(tx, tx->tx_desc_size);
2257                 }
2258         } else {
2259                 spin_unlock(&ksocknal_data.ksnd_tx_lock);
2260         }
2261 }
2262
2263 void
2264 ksocknal_base_shutdown(void)
2265 {
2266         struct ksock_sched_info *info;
2267         ksock_sched_t           *sched;
2268         int                     i;
2269         int                     j;
2270
2271         CDEBUG(D_MALLOC, "before NAL cleanup: kmem %d\n",
2272                cfs_atomic_read (&libcfs_kmemory));
2273         LASSERT (ksocknal_data.ksnd_nnets == 0);
2274
2275         switch (ksocknal_data.ksnd_init) {
2276         default:
2277                 LASSERT (0);
2278
2279         case SOCKNAL_INIT_ALL:
2280         case SOCKNAL_INIT_DATA:
2281                 LASSERT (ksocknal_data.ksnd_peers != NULL);
2282                 for (i = 0; i < ksocknal_data.ksnd_peer_hash_size; i++) {
2283                         LASSERT (cfs_list_empty (&ksocknal_data.ksnd_peers[i]));
2284                 }
2285
2286                 LASSERT(cfs_list_empty(&ksocknal_data.ksnd_nets));
2287                 LASSERT (cfs_list_empty (&ksocknal_data.ksnd_enomem_conns));
2288                 LASSERT (cfs_list_empty (&ksocknal_data.ksnd_zombie_conns));
2289                 LASSERT (cfs_list_empty (&ksocknal_data.ksnd_connd_connreqs));
2290                 LASSERT (cfs_list_empty (&ksocknal_data.ksnd_connd_routes));
2291
2292                 if (ksocknal_data.ksnd_sched_info != NULL) {
2293                         cfs_percpt_for_each(info, i,
2294                                             ksocknal_data.ksnd_sched_info) {
2295                                 if (info->ksi_scheds == NULL)
2296                                         continue;
2297
2298                                 for (j = 0; j < info->ksi_nthreads_max; j++) {
2299
2300                                         sched = &info->ksi_scheds[j];
2301                                         LASSERT(cfs_list_empty(&sched->\
2302                                                                kss_tx_conns));
2303                                         LASSERT(cfs_list_empty(&sched->\
2304                                                                kss_rx_conns));
2305                                         LASSERT(cfs_list_empty(&sched-> \
2306                                                   kss_zombie_noop_txs));
2307                                         LASSERT(sched->kss_nconns == 0);
2308                                 }
2309                         }
2310                 }
2311
2312                 /* flag threads to terminate; wake and wait for them to die */
2313                 ksocknal_data.ksnd_shuttingdown = 1;
2314                 cfs_waitq_broadcast(&ksocknal_data.ksnd_connd_waitq);
2315                 cfs_waitq_broadcast(&ksocknal_data.ksnd_reaper_waitq);
2316
2317                 if (ksocknal_data.ksnd_sched_info != NULL) {
2318                         cfs_percpt_for_each(info, i,
2319                                             ksocknal_data.ksnd_sched_info) {
2320                                 if (info->ksi_scheds == NULL)
2321                                         continue;
2322
2323                                 for (j = 0; j < info->ksi_nthreads_max; j++) {
2324                                         sched = &info->ksi_scheds[j];
2325                                         cfs_waitq_broadcast(&sched->kss_waitq);
2326                                 }
2327                         }
2328                 }
2329
2330                 i = 4;
2331                 read_lock(&ksocknal_data.ksnd_global_lock);
2332                 while (ksocknal_data.ksnd_nthreads != 0) {
2333                         i++;
2334                         CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET, /* power of 2? */
2335                                "waiting for %d threads to terminate\n",
2336                                 ksocknal_data.ksnd_nthreads);
2337                         read_unlock(&ksocknal_data.ksnd_global_lock);
2338                         cfs_pause(cfs_time_seconds(1));
2339                         read_lock(&ksocknal_data.ksnd_global_lock);
2340                 }
2341                 read_unlock(&ksocknal_data.ksnd_global_lock);
2342
2343                 ksocknal_free_buffers();
2344
2345                 ksocknal_data.ksnd_init = SOCKNAL_INIT_NOTHING;
2346                 break;
2347         }
2348
2349         CDEBUG(D_MALLOC, "after NAL cleanup: kmem %d\n",
2350                cfs_atomic_read (&libcfs_kmemory));
2351
2352         PORTAL_MODULE_UNUSE;
2353 }
2354
2355 __u64
2356 ksocknal_new_incarnation (void)
2357 {
2358         struct timeval tv;
2359
2360         /* The incarnation number is the time this module loaded and it
2361          * identifies this particular instance of the socknal.  Hopefully
2362          * we won't be able to reboot more frequently than 1MHz for the
2363          * forseeable future :) */
2364
2365         cfs_gettimeofday(&tv);
2366
2367         return (((__u64)tv.tv_sec) * 1000000) + tv.tv_usec;
2368 }
2369
2370 int
2371 ksocknal_base_startup(void)
2372 {
2373         struct ksock_sched_info *info;
2374         int                     rc;
2375         int                     i;
2376
2377         LASSERT (ksocknal_data.ksnd_init == SOCKNAL_INIT_NOTHING);
2378         LASSERT (ksocknal_data.ksnd_nnets == 0);
2379
2380         memset (&ksocknal_data, 0, sizeof (ksocknal_data)); /* zero pointers */
2381
2382         ksocknal_data.ksnd_peer_hash_size = SOCKNAL_PEER_HASH_SIZE;
2383         LIBCFS_ALLOC (ksocknal_data.ksnd_peers,
2384                       sizeof (cfs_list_t) *
2385                       ksocknal_data.ksnd_peer_hash_size);
2386         if (ksocknal_data.ksnd_peers == NULL)
2387                 return -ENOMEM;
2388
2389         for (i = 0; i < ksocknal_data.ksnd_peer_hash_size; i++)
2390                 CFS_INIT_LIST_HEAD(&ksocknal_data.ksnd_peers[i]);
2391
2392         rwlock_init(&ksocknal_data.ksnd_global_lock);
2393         CFS_INIT_LIST_HEAD(&ksocknal_data.ksnd_nets);
2394
2395         spin_lock_init(&ksocknal_data.ksnd_reaper_lock);
2396         CFS_INIT_LIST_HEAD (&ksocknal_data.ksnd_enomem_conns);
2397         CFS_INIT_LIST_HEAD (&ksocknal_data.ksnd_zombie_conns);
2398         CFS_INIT_LIST_HEAD (&ksocknal_data.ksnd_deathrow_conns);
2399         cfs_waitq_init(&ksocknal_data.ksnd_reaper_waitq);
2400
2401         spin_lock_init(&ksocknal_data.ksnd_connd_lock);
2402         CFS_INIT_LIST_HEAD (&ksocknal_data.ksnd_connd_connreqs);
2403         CFS_INIT_LIST_HEAD (&ksocknal_data.ksnd_connd_routes);
2404         cfs_waitq_init(&ksocknal_data.ksnd_connd_waitq);
2405
2406         spin_lock_init(&ksocknal_data.ksnd_tx_lock);
2407         CFS_INIT_LIST_HEAD (&ksocknal_data.ksnd_idle_noop_txs);
2408
2409         /* NB memset above zeros whole of ksocknal_data */
2410
2411         /* flag lists/ptrs/locks initialised */
2412         ksocknal_data.ksnd_init = SOCKNAL_INIT_DATA;
2413         PORTAL_MODULE_USE;
2414
2415         ksocknal_data.ksnd_sched_info = cfs_percpt_alloc(lnet_cpt_table(),
2416                                                          sizeof(*info));
2417         if (ksocknal_data.ksnd_sched_info == NULL)
2418                 goto failed;
2419
2420         cfs_percpt_for_each(info, i, ksocknal_data.ksnd_sched_info) {
2421                 ksock_sched_t   *sched;
2422                 int             nthrs;
2423
2424                 nthrs = cfs_cpt_weight(lnet_cpt_table(), i);
2425                 if (*ksocknal_tunables.ksnd_nscheds > 0) {
2426                         nthrs = min(nthrs, *ksocknal_tunables.ksnd_nscheds);
2427                 } else {
2428                         /* max to half of CPUs, assume another half should be
2429                          * reserved for upper layer modules */
2430                         nthrs = min(max(SOCKNAL_NSCHEDS, nthrs >> 1), nthrs);
2431                 }
2432
2433                 info->ksi_nthreads_max = nthrs;
2434                 info->ksi_cpt = i;
2435
2436                 LIBCFS_CPT_ALLOC(info->ksi_scheds, lnet_cpt_table(), i,
2437                                  info->ksi_nthreads_max * sizeof(*sched));
2438                 if (info->ksi_scheds == NULL)
2439                         goto failed;
2440
2441                 for (; nthrs > 0; nthrs--) {
2442                         sched = &info->ksi_scheds[nthrs - 1];
2443
2444                         sched->kss_info = info;
2445                         spin_lock_init(&sched->kss_lock);
2446                         CFS_INIT_LIST_HEAD(&sched->kss_rx_conns);
2447                         CFS_INIT_LIST_HEAD(&sched->kss_tx_conns);
2448                         CFS_INIT_LIST_HEAD(&sched->kss_zombie_noop_txs);
2449                         cfs_waitq_init(&sched->kss_waitq);
2450                 }
2451         }
2452
2453         ksocknal_data.ksnd_connd_starting         = 0;
2454         ksocknal_data.ksnd_connd_failed_stamp     = 0;
2455         ksocknal_data.ksnd_connd_starting_stamp   = cfs_time_current_sec();
2456         /* must have at least 2 connds to remain responsive to accepts while
2457          * connecting */
2458         if (*ksocknal_tunables.ksnd_nconnds < SOCKNAL_CONND_RESV + 1)
2459                 *ksocknal_tunables.ksnd_nconnds = SOCKNAL_CONND_RESV + 1;
2460
2461         if (*ksocknal_tunables.ksnd_nconnds_max <
2462             *ksocknal_tunables.ksnd_nconnds) {
2463                 ksocknal_tunables.ksnd_nconnds_max =
2464                         ksocknal_tunables.ksnd_nconnds;
2465         }
2466
2467         for (i = 0; i < *ksocknal_tunables.ksnd_nconnds; i++) {
2468                 spin_lock_bh(&ksocknal_data.ksnd_connd_lock);
2469                 ksocknal_data.ksnd_connd_starting++;
2470                 spin_unlock_bh(&ksocknal_data.ksnd_connd_lock);
2471
2472                 rc = ksocknal_thread_start(ksocknal_connd,
2473                                            (void *)((ulong_ptr_t)i));
2474                 if (rc != 0) {
2475                         spin_lock_bh(&ksocknal_data.ksnd_connd_lock);
2476                         ksocknal_data.ksnd_connd_starting--;
2477                         spin_unlock_bh(&ksocknal_data.ksnd_connd_lock);
2478                         CERROR("Can't spawn socknal connd: %d\n", rc);
2479                         goto failed;
2480                 }
2481         }
2482
2483         rc = ksocknal_thread_start (ksocknal_reaper, NULL);
2484         if (rc != 0) {
2485                 CERROR ("Can't spawn socknal reaper: %d\n", rc);
2486                 goto failed;
2487         }
2488
2489         /* flag everything initialised */
2490         ksocknal_data.ksnd_init = SOCKNAL_INIT_ALL;
2491
2492         return 0;
2493
2494  failed:
2495         ksocknal_base_shutdown();
2496         return -ENETDOWN;
2497 }
2498
2499 void
2500 ksocknal_debug_peerhash (lnet_ni_t *ni)
2501 {
2502         ksock_peer_t    *peer = NULL;
2503         cfs_list_t      *tmp;
2504         int             i;
2505
2506         read_lock(&ksocknal_data.ksnd_global_lock);
2507
2508         for (i = 0; i < ksocknal_data.ksnd_peer_hash_size; i++) {
2509                 cfs_list_for_each (tmp, &ksocknal_data.ksnd_peers[i]) {
2510                         peer = cfs_list_entry (tmp, ksock_peer_t, ksnp_list);
2511
2512                         if (peer->ksnp_ni == ni) break;
2513
2514                         peer = NULL;
2515                 }
2516         }
2517
2518         if (peer != NULL) {
2519                 ksock_route_t *route;
2520                 ksock_conn_t  *conn;
2521
2522                 CWARN ("Active peer on shutdown: %s, ref %d, scnt %d, "
2523                        "closing %d, accepting %d, err %d, zcookie "LPU64", "
2524                        "txq %d, zc_req %d\n", libcfs_id2str(peer->ksnp_id),
2525                        cfs_atomic_read(&peer->ksnp_refcount),
2526                        peer->ksnp_sharecount, peer->ksnp_closing,
2527                        peer->ksnp_accepting, peer->ksnp_error,
2528                        peer->ksnp_zc_next_cookie,
2529                        !cfs_list_empty(&peer->ksnp_tx_queue),
2530                        !cfs_list_empty(&peer->ksnp_zc_req_list));
2531
2532                 cfs_list_for_each (tmp, &peer->ksnp_routes) {
2533                         route = cfs_list_entry(tmp, ksock_route_t, ksnr_list);
2534                         CWARN ("Route: ref %d, schd %d, conn %d, cnted %d, "
2535                                "del %d\n", cfs_atomic_read(&route->ksnr_refcount),
2536                                route->ksnr_scheduled, route->ksnr_connecting,
2537                                route->ksnr_connected, route->ksnr_deleted);
2538                 }
2539
2540                 cfs_list_for_each (tmp, &peer->ksnp_conns) {
2541                         conn = cfs_list_entry(tmp, ksock_conn_t, ksnc_list);
2542                         CWARN ("Conn: ref %d, sref %d, t %d, c %d\n",
2543                                cfs_atomic_read(&conn->ksnc_conn_refcount),
2544                                cfs_atomic_read(&conn->ksnc_sock_refcount),
2545                                conn->ksnc_type, conn->ksnc_closing);
2546                 }
2547         }
2548
2549         read_unlock(&ksocknal_data.ksnd_global_lock);
2550         return;
2551 }
2552
2553 void
2554 ksocknal_shutdown (lnet_ni_t *ni)
2555 {
2556         ksock_net_t      *net = ni->ni_data;
2557         int               i;
2558         lnet_process_id_t anyid = {0};
2559
2560         anyid.nid =  LNET_NID_ANY;
2561         anyid.pid =  LNET_PID_ANY;
2562
2563         LASSERT(ksocknal_data.ksnd_init == SOCKNAL_INIT_ALL);
2564         LASSERT(ksocknal_data.ksnd_nnets > 0);
2565
2566         spin_lock_bh(&net->ksnn_lock);
2567         net->ksnn_shutdown = 1;                 /* prevent new peers */
2568         spin_unlock_bh(&net->ksnn_lock);
2569
2570         /* Delete all peers */
2571         ksocknal_del_peer(ni, anyid, 0);
2572
2573         /* Wait for all peer state to clean up */
2574         i = 2;
2575         spin_lock_bh(&net->ksnn_lock);
2576         while (net->ksnn_npeers != 0) {
2577                 spin_unlock_bh(&net->ksnn_lock);
2578
2579                 i++;
2580                 CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET, /* power of 2? */
2581                        "waiting for %d peers to disconnect\n",
2582                        net->ksnn_npeers);
2583                 cfs_pause(cfs_time_seconds(1));
2584
2585                 ksocknal_debug_peerhash(ni);
2586
2587                 spin_lock_bh(&net->ksnn_lock);
2588         }
2589         spin_unlock_bh(&net->ksnn_lock);
2590
2591         for (i = 0; i < net->ksnn_ninterfaces; i++) {
2592                 LASSERT (net->ksnn_interfaces[i].ksni_npeers == 0);
2593                 LASSERT (net->ksnn_interfaces[i].ksni_nroutes == 0);
2594         }
2595
2596         cfs_list_del(&net->ksnn_list);
2597         LIBCFS_FREE(net, sizeof(*net));
2598
2599         ksocknal_data.ksnd_nnets--;
2600         if (ksocknal_data.ksnd_nnets == 0)
2601                 ksocknal_base_shutdown();
2602 }
2603
2604 int
2605 ksocknal_enumerate_interfaces(ksock_net_t *net)
2606 {
2607         char      **names;
2608         int         i;
2609         int         j;
2610         int         rc;
2611         int         n;
2612
2613         n = libcfs_ipif_enumerate(&names);
2614         if (n <= 0) {
2615                 CERROR("Can't enumerate interfaces: %d\n", n);
2616                 return n;
2617         }
2618
2619         for (i = j = 0; i < n; i++) {
2620                 int        up;
2621                 __u32      ip;
2622                 __u32      mask;
2623
2624                 if (!strcmp(names[i], "lo")) /* skip the loopback IF */
2625                         continue;
2626
2627                 rc = libcfs_ipif_query(names[i], &up, &ip, &mask);
2628                 if (rc != 0) {
2629                         CWARN("Can't get interface %s info: %d\n",
2630                               names[i], rc);
2631                         continue;
2632                 }
2633
2634                 if (!up) {
2635                         CWARN("Ignoring interface %s (down)\n",
2636                               names[i]);
2637                         continue;
2638                 }
2639
2640                 if (j == LNET_MAX_INTERFACES) {
2641                         CWARN("Ignoring interface %s (too many interfaces)\n",
2642                               names[i]);
2643                         continue;
2644                 }
2645
2646                 net->ksnn_interfaces[j].ksni_ipaddr = ip;
2647                 net->ksnn_interfaces[j].ksni_netmask = mask;
2648                 strncpy(&net->ksnn_interfaces[j].ksni_name[0],
2649                         names[i], IFNAMSIZ);
2650                 j++;
2651         }
2652
2653         libcfs_ipif_free_enumeration(names, n);
2654
2655         if (j == 0)
2656                 CERROR("Can't find any usable interfaces\n");
2657
2658         return j;
2659 }
2660
2661 int
2662 ksocknal_search_new_ipif(ksock_net_t *net)
2663 {
2664         int     new_ipif = 0;
2665         int     i;
2666
2667         for (i = 0; i < net->ksnn_ninterfaces; i++) {
2668                 char            *ifnam = &net->ksnn_interfaces[i].ksni_name[0];
2669                 char            *colon = strchr(ifnam, ':');
2670                 int             found  = 0;
2671                 ksock_net_t     *tmp;
2672                 int             j;
2673
2674                 if (colon != NULL) /* ignore alias device */
2675                         *colon = 0;
2676
2677                 cfs_list_for_each_entry(tmp, &ksocknal_data.ksnd_nets,
2678                                         ksnn_list) {
2679                         for (j = 0; !found && j < tmp->ksnn_ninterfaces; j++) {
2680                                 char *ifnam2 = &tmp->ksnn_interfaces[j].\
2681                                              ksni_name[0];
2682                                 char *colon2 = strchr(ifnam2, ':');
2683
2684                                 if (colon2 != NULL)
2685                                         *colon2 = 0;
2686
2687                                 found = strcmp(ifnam, ifnam2) == 0;
2688                                 if (colon2 != NULL)
2689                                         *colon2 = ':';
2690                         }
2691                         if (found)
2692                                 break;
2693                 }
2694
2695                 new_ipif += !found;
2696                 if (colon != NULL)
2697                         *colon = ':';
2698         }
2699
2700         return new_ipif;
2701 }
2702
2703 int
2704 ksocknal_start_schedulers(struct ksock_sched_info *info)
2705 {
2706         int     nthrs;
2707         int     rc = 0;
2708         int     i;
2709
2710         if (info->ksi_nthreads == 0) {
2711                 if (*ksocknal_tunables.ksnd_nscheds > 0) {
2712                         nthrs = info->ksi_nthreads_max;
2713                 } else {
2714                         nthrs = cfs_cpt_weight(lnet_cpt_table(),
2715                                                info->ksi_cpt);
2716                         nthrs = min(max(SOCKNAL_NSCHEDS, nthrs >> 1), nthrs);
2717                         nthrs = min(SOCKNAL_NSCHEDS_HIGH, nthrs);
2718                 }
2719                 nthrs = min(nthrs, info->ksi_nthreads_max);
2720         } else {
2721                 LASSERT(info->ksi_nthreads <= info->ksi_nthreads_max);
2722                 /* increase two threads if there is new interface */
2723                 nthrs = min(2, info->ksi_nthreads_max - info->ksi_nthreads);
2724         }
2725
2726         for (i = 0; i < nthrs; i++) {
2727                 long    id;
2728
2729                 id = KSOCK_THREAD_ID(info->ksi_cpt, info->ksi_nthreads + i);
2730                 rc = ksocknal_thread_start(ksocknal_scheduler, (void *)id);
2731                 if (rc == 0)
2732                         continue;
2733
2734                 CERROR("Can't spawn thread %d for scheduler[%d]: %d\n",
2735                        info->ksi_cpt, info->ksi_nthreads + i, rc);
2736                 break;
2737         }
2738
2739         info->ksi_nthreads += i;
2740         return rc;
2741 }
2742
2743 int
2744 ksocknal_net_start_threads(ksock_net_t *net, __u32 *cpts, int ncpts)
2745 {
2746         int     newif = ksocknal_search_new_ipif(net);
2747         int     rc;
2748         int     i;
2749
2750         LASSERT(ncpts > 0 && ncpts <= cfs_cpt_number(lnet_cpt_table()));
2751
2752         for (i = 0; i < ncpts; i++) {
2753                 struct ksock_sched_info *info;
2754                 int cpt = (cpts == NULL) ? i : cpts[i];
2755
2756                 LASSERT(cpt < cfs_cpt_number(lnet_cpt_table()));
2757                 info = ksocknal_data.ksnd_sched_info[cpt];
2758
2759                 if (!newif && info->ksi_nthreads > 0)
2760                         continue;
2761
2762                 rc = ksocknal_start_schedulers(info);
2763                 if (rc != 0)
2764                         return rc;
2765         }
2766         return 0;
2767 }
2768
2769 int
2770 ksocknal_startup (lnet_ni_t *ni)
2771 {
2772         ksock_net_t  *net;
2773         int           rc;
2774         int           i;
2775
2776         LASSERT (ni->ni_lnd == &the_ksocklnd);
2777
2778         if (ksocknal_data.ksnd_init == SOCKNAL_INIT_NOTHING) {
2779                 rc = ksocknal_base_startup();
2780                 if (rc != 0)
2781                         return rc;
2782         }
2783
2784         LIBCFS_ALLOC(net, sizeof(*net));
2785         if (net == NULL)
2786                 goto fail_0;
2787
2788         spin_lock_init(&net->ksnn_lock);
2789         net->ksnn_incarnation = ksocknal_new_incarnation();
2790         ni->ni_data = net;
2791         ni->ni_peertimeout    = *ksocknal_tunables.ksnd_peertimeout;
2792         ni->ni_maxtxcredits   = *ksocknal_tunables.ksnd_credits;
2793         ni->ni_peertxcredits  = *ksocknal_tunables.ksnd_peertxcredits;
2794         ni->ni_peerrtrcredits = *ksocknal_tunables.ksnd_peerrtrcredits;
2795
2796         if (ni->ni_interfaces[0] == NULL) {
2797                 rc = ksocknal_enumerate_interfaces(net);
2798                 if (rc <= 0)
2799                         goto fail_1;
2800
2801                 net->ksnn_ninterfaces = 1;
2802         } else {
2803                 for (i = 0; i < LNET_MAX_INTERFACES; i++) {
2804                         int    up;
2805
2806                         if (ni->ni_interfaces[i] == NULL)
2807                                 break;
2808
2809                         rc = libcfs_ipif_query(
2810                                 ni->ni_interfaces[i], &up,
2811                                 &net->ksnn_interfaces[i].ksni_ipaddr,
2812                                 &net->ksnn_interfaces[i].ksni_netmask);
2813
2814                         if (rc != 0) {
2815                                 CERROR("Can't get interface %s info: %d\n",
2816                                        ni->ni_interfaces[i], rc);
2817                                 goto fail_1;
2818                         }
2819
2820                         if (!up) {
2821                                 CERROR("Interface %s is down\n",
2822                                        ni->ni_interfaces[i]);
2823                                 goto fail_1;
2824                         }
2825
2826                         strncpy(&net->ksnn_interfaces[i].ksni_name[0],
2827                                 ni->ni_interfaces[i], IFNAMSIZ);
2828                 }
2829                 net->ksnn_ninterfaces = i;
2830         }
2831
2832         /* call it before add it to ksocknal_data.ksnd_nets */
2833         rc = ksocknal_net_start_threads(net, ni->ni_cpts, ni->ni_ncpts);
2834         if (rc != 0)
2835                 goto fail_1;
2836
2837         ni->ni_nid = LNET_MKNID(LNET_NIDNET(ni->ni_nid),
2838                                 net->ksnn_interfaces[0].ksni_ipaddr);
2839         cfs_list_add(&net->ksnn_list, &ksocknal_data.ksnd_nets);
2840
2841         ksocknal_data.ksnd_nnets++;
2842
2843         return 0;
2844
2845  fail_1:
2846         LIBCFS_FREE(net, sizeof(*net));
2847  fail_0:
2848         if (ksocknal_data.ksnd_nnets == 0)
2849                 ksocknal_base_shutdown();
2850
2851         return -ENETDOWN;
2852 }
2853
2854
2855 void __exit
2856 ksocknal_module_fini (void)
2857 {
2858         lnet_unregister_lnd(&the_ksocklnd);
2859         ksocknal_tunables_fini();
2860 }
2861
2862 int __init
2863 ksocknal_module_init (void)
2864 {
2865         int    rc;
2866
2867         /* check ksnr_connected/connecting field large enough */
2868         CLASSERT (SOCKLND_CONN_NTYPES <= 4);
2869         CLASSERT (SOCKLND_CONN_ACK == SOCKLND_CONN_BULK_IN);
2870
2871         /* initialize the_ksocklnd */
2872         the_ksocklnd.lnd_type     = SOCKLND;
2873         the_ksocklnd.lnd_startup  = ksocknal_startup;
2874         the_ksocklnd.lnd_shutdown = ksocknal_shutdown;
2875         the_ksocklnd.lnd_ctl      = ksocknal_ctl;
2876         the_ksocklnd.lnd_send     = ksocknal_send;
2877         the_ksocklnd.lnd_recv     = ksocknal_recv;
2878         the_ksocklnd.lnd_notify   = ksocknal_notify;
2879         the_ksocklnd.lnd_query    = ksocknal_query;
2880         the_ksocklnd.lnd_accept   = ksocknal_accept;
2881
2882         rc = ksocknal_tunables_init();
2883         if (rc != 0)
2884                 return rc;
2885
2886         lnet_register_lnd(&the_ksocklnd);
2887
2888         return 0;
2889 }
2890
2891 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
2892 MODULE_DESCRIPTION("Kernel TCP Socket LND v3.0.0");
2893 MODULE_LICENSE("GPL");
2894
2895 cfs_module(ksocknal, "3.0.0", ksocknal_module_init, ksocknal_module_fini);