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.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2011, 2015, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  *
  32  * lnet/klnds/socklnd/socklnd.c
  33  *
  34  * Author: Zach Brown <zab@zabbo.net>
  35  * Author: Peter J. Braam <braam@clusterfs.com>
  36  * Author: Phil Schwan <phil@clusterfs.com>
  37  * Author: Eric Barton <eric@bartonsoftware.com>
  38  */
  39
  40 #include <linux/pci.h>
  41 #include "socklnd.h"
  42
  43 static struct lnet_lnd the_ksocklnd;
  44 ksock_nal_data_t        ksocknal_data;
  45
  46 static ksock_interface_t *
  47 ksocknal_ip2iface(struct lnet_ni *ni, __u32 ip)
  48 {
  49         ksock_net_t       *net = ni->ni_data;
  50         int                i;
  51         ksock_interface_t *iface;
  52
  53         for (i = 0; i < net->ksnn_ninterfaces; i++) {
  54                 LASSERT(i < LNET_MAX_INTERFACES);
  55                 iface = &net->ksnn_interfaces[i];
  56
  57                 if (iface->ksni_ipaddr == ip)
  58                         return (iface);
  59         }
  60
  61         return (NULL);
  62 }
  63
  64 static ksock_route_t *
  65 ksocknal_create_route (__u32 ipaddr, int port)
  66 {
  67         ksock_route_t *route;
  68
  69         LIBCFS_ALLOC (route, sizeof (*route));
  70         if (route == NULL)
  71                 return (NULL);
  72
  73         atomic_set (&route->ksnr_refcount, 1);
  74         route->ksnr_peer = NULL;
  75         route->ksnr_retry_interval = 0;         /* OK to connect at any time */
  76         route->ksnr_ipaddr = ipaddr;
  77         route->ksnr_port = port;
  78         route->ksnr_scheduled = 0;
  79         route->ksnr_connecting = 0;
  80         route->ksnr_connected = 0;
  81         route->ksnr_deleted = 0;
  82         route->ksnr_conn_count = 0;
  83         route->ksnr_share_count = 0;
  84
  85         return (route);
  86 }
  87
  88 void
  89 ksocknal_destroy_route (ksock_route_t *route)
  90 {
  91         LASSERT (atomic_read(&route->ksnr_refcount) == 0);
  92
  93         if (route->ksnr_peer != NULL)
  94                 ksocknal_peer_decref(route->ksnr_peer);
  95
  96         LIBCFS_FREE (route, sizeof (*route));
  97 }
  98
  99 static int
 100 ksocknal_create_peer(ksock_peer_ni_t **peerp, struct lnet_ni *ni,
 101                      struct lnet_process_id id)
 102 {
 103         int             cpt = lnet_cpt_of_nid(id.nid, ni);
 104         ksock_net_t     *net = ni->ni_data;
 105         ksock_peer_ni_t *peer_ni;
 106
 107         LASSERT(id.nid != LNET_NID_ANY);
 108         LASSERT(id.pid != LNET_PID_ANY);
 109         LASSERT(!in_interrupt());
 110
 111         LIBCFS_CPT_ALLOC(peer_ni, lnet_cpt_table(), cpt, sizeof(*peer_ni));
 112         if (peer_ni == NULL)
 113                 return -ENOMEM;
 114
 115         peer_ni->ksnp_ni = ni;
 116         peer_ni->ksnp_id = id;
 117         atomic_set(&peer_ni->ksnp_refcount, 1); /* 1 ref for caller */
 118         peer_ni->ksnp_closing = 0;
 119         peer_ni->ksnp_accepting = 0;
 120         peer_ni->ksnp_proto = NULL;
 121         peer_ni->ksnp_last_alive = 0;
 122         peer_ni->ksnp_zc_next_cookie = SOCKNAL_KEEPALIVE_PING + 1;
 123
 124         INIT_LIST_HEAD(&peer_ni->ksnp_conns);
 125         INIT_LIST_HEAD(&peer_ni->ksnp_routes);
 126         INIT_LIST_HEAD(&peer_ni->ksnp_tx_queue);
 127         INIT_LIST_HEAD(&peer_ni->ksnp_zc_req_list);
 128         spin_lock_init(&peer_ni->ksnp_lock);
 129
 130         spin_lock_bh(&net->ksnn_lock);
 131
 132         if (net->ksnn_shutdown) {
 133                 spin_unlock_bh(&net->ksnn_lock);
 134
 135                 LIBCFS_FREE(peer_ni, sizeof(*peer_ni));
 136                 CERROR("Can't create peer_ni: network shutdown\n");
 137                 return -ESHUTDOWN;
 138         }
 139
 140         net->ksnn_npeers++;
 141
 142         spin_unlock_bh(&net->ksnn_lock);
 143
 144         *peerp = peer_ni;
 145         return 0;
 146 }
 147
 148 void
 149 ksocknal_destroy_peer (ksock_peer_ni_t *peer_ni)
 150 {
 151         ksock_net_t    *net = peer_ni->ksnp_ni->ni_data;
 152
 153         CDEBUG (D_NET, "peer_ni %s %p deleted\n",
 154                 libcfs_id2str(peer_ni->ksnp_id), peer_ni);
 155
 156         LASSERT(atomic_read(&peer_ni->ksnp_refcount) == 0);
 157         LASSERT(peer_ni->ksnp_accepting == 0);
 158         LASSERT(list_empty(&peer_ni->ksnp_conns));
 159         LASSERT(list_empty(&peer_ni->ksnp_routes));
 160         LASSERT(list_empty(&peer_ni->ksnp_tx_queue));
 161         LASSERT(list_empty(&peer_ni->ksnp_zc_req_list));
 162
 163         LIBCFS_FREE(peer_ni, sizeof(*peer_ni));
 164
 165         /* NB a peer_ni's connections and routes keep a reference on their peer_ni
 166          * until they are destroyed, so we can be assured that _all_ state to
 167          * do with this peer_ni has been cleaned up when its refcount drops to
 168          * zero. */
 169         spin_lock_bh(&net->ksnn_lock);
 170         net->ksnn_npeers--;
 171         spin_unlock_bh(&net->ksnn_lock);
 172 }
 173
 174 ksock_peer_ni_t *
 175 ksocknal_find_peer_locked(struct lnet_ni *ni, struct lnet_process_id id)
 176 {
 177         struct list_head *peer_list = ksocknal_nid2peerlist(id.nid);
 178         struct list_head *tmp;
 179         ksock_peer_ni_t  *peer_ni;
 180
 181         list_for_each(tmp, peer_list) {
 182
 183                 peer_ni = list_entry(tmp, ksock_peer_ni_t, ksnp_list);
 184
 185                 LASSERT(!peer_ni->ksnp_closing);
 186
 187                 if (peer_ni->ksnp_ni != ni)
 188                         continue;
 189
 190                 if (peer_ni->ksnp_id.nid != id.nid ||
 191                     peer_ni->ksnp_id.pid != id.pid)
 192                         continue;
 193
 194                 CDEBUG(D_NET, "got peer_ni [%p] -> %s (%d)\n",
 195                        peer_ni, libcfs_id2str(id),
 196                        atomic_read(&peer_ni->ksnp_refcount));
 197                 return peer_ni;
 198         }
 199         return NULL;
 200 }
 201
 202 ksock_peer_ni_t *
 203 ksocknal_find_peer(struct lnet_ni *ni, struct lnet_process_id id)
 204 {
 205         ksock_peer_ni_t     *peer_ni;
 206
 207         read_lock(&ksocknal_data.ksnd_global_lock);
 208         peer_ni = ksocknal_find_peer_locked(ni, id);
 209         if (peer_ni != NULL)                    /* +1 ref for caller? */
 210                 ksocknal_peer_addref(peer_ni);
 211         read_unlock(&ksocknal_data.ksnd_global_lock);
 212
 213         return (peer_ni);
 214 }
 215
 216 static void
 217 ksocknal_unlink_peer_locked (ksock_peer_ni_t *peer_ni)
 218 {
 219         int                i;
 220         __u32              ip;
 221         ksock_interface_t *iface;
 222
 223         for (i = 0; i < peer_ni->ksnp_n_passive_ips; i++) {
 224                 LASSERT (i < LNET_MAX_INTERFACES);
 225                 ip = peer_ni->ksnp_passive_ips[i];
 226
 227                 iface = ksocknal_ip2iface(peer_ni->ksnp_ni, ip);
 228                 /* All IPs in peer_ni->ksnp_passive_ips[] come from the
 229                  * interface list, therefore the call must succeed. */
 230                 LASSERT (iface != NULL);
 231
 232                 CDEBUG(D_NET, "peer_ni=%p iface=%p ksni_nroutes=%d\n",
 233                        peer_ni, iface, iface->ksni_nroutes);
 234                 iface->ksni_npeers--;
 235         }
 236
 237         LASSERT(list_empty(&peer_ni->ksnp_conns));
 238         LASSERT(list_empty(&peer_ni->ksnp_routes));
 239         LASSERT(!peer_ni->ksnp_closing);
 240         peer_ni->ksnp_closing = 1;
 241         list_del(&peer_ni->ksnp_list);
 242         /* lose peerlist's ref */
 243         ksocknal_peer_decref(peer_ni);
 244 }
 245
 246 static int
 247 ksocknal_get_peer_info(struct lnet_ni *ni, int index,
 248                        struct lnet_process_id *id, __u32 *myip, __u32 *peer_ip,
 249                        int *port, int *conn_count, int *share_count)
 250 {
 251         ksock_peer_ni_t   *peer_ni;
 252         struct list_head  *ptmp;
 253         ksock_route_t     *route;
 254         struct list_head  *rtmp;
 255         int                i;
 256         int                j;
 257         int                rc = -ENOENT;
 258
 259         read_lock(&ksocknal_data.ksnd_global_lock);
 260
 261         for (i = 0; i < ksocknal_data.ksnd_peer_hash_size; i++) {
 262                 list_for_each(ptmp, &ksocknal_data.ksnd_peers[i]) {
 263                         peer_ni = list_entry(ptmp, ksock_peer_ni_t, ksnp_list);
 264
 265                         if (peer_ni->ksnp_ni != ni)
 266                                 continue;
 267
 268                         if (peer_ni->ksnp_n_passive_ips == 0 &&
 269                             list_empty(&peer_ni->ksnp_routes)) {
 270                                 if (index-- > 0)
 271                                         continue;
 272
 273                                 *id = peer_ni->ksnp_id;
 274                                 *myip = 0;
 275                                 *peer_ip = 0;
 276                                 *port = 0;
 277                                 *conn_count = 0;
 278                                 *share_count = 0;
 279                                 rc = 0;
 280                                 goto out;
 281                         }
 282
 283                         for (j = 0; j < peer_ni->ksnp_n_passive_ips; j++) {
 284                                 if (index-- > 0)
 285                                         continue;
 286
 287                                 *id = peer_ni->ksnp_id;
 288                                 *myip = peer_ni->ksnp_passive_ips[j];
 289                                 *peer_ip = 0;
 290                                 *port = 0;
 291                                 *conn_count = 0;
 292                                 *share_count = 0;
 293                                 rc = 0;
 294                                 goto out;
 295                         }
 296
 297                         list_for_each(rtmp, &peer_ni->ksnp_routes) {
 298                                 if (index-- > 0)
 299                                         continue;
 300
 301                                 route = list_entry(rtmp, ksock_route_t,
 302                                                    ksnr_list);
 303
 304                                 *id = peer_ni->ksnp_id;
 305                                 *myip = route->ksnr_myipaddr;
 306                                 *peer_ip = route->ksnr_ipaddr;
 307                                 *port = route->ksnr_port;
 308                                 *conn_count = route->ksnr_conn_count;
 309                                 *share_count = route->ksnr_share_count;
 310                                 rc = 0;
 311                                 goto out;
 312                         }
 313                 }
 314         }
 315 out:
 316         read_unlock(&ksocknal_data.ksnd_global_lock);
 317         return rc;
 318 }
 319
 320 static void
 321 ksocknal_associate_route_conn_locked(ksock_route_t *route, ksock_conn_t *conn)
 322 {
 323         ksock_peer_ni_t   *peer_ni = route->ksnr_peer;
 324         int                type = conn->ksnc_type;
 325         ksock_interface_t *iface;
 326
 327         conn->ksnc_route = route;
 328         ksocknal_route_addref(route);
 329
 330         if (route->ksnr_myipaddr != conn->ksnc_myipaddr) {
 331                 if (route->ksnr_myipaddr == 0) {
 332                         /* route wasn't bound locally yet (the initial route) */
 333                         CDEBUG(D_NET, "Binding %s %pI4h to %pI4h\n",
 334                                libcfs_id2str(peer_ni->ksnp_id),
 335                                &route->ksnr_ipaddr,
 336                                &conn->ksnc_myipaddr);
 337                 } else {
 338                         CDEBUG(D_NET, "Rebinding %s %pI4h from %pI4h "
 339                                "to %pI4h\n", libcfs_id2str(peer_ni->ksnp_id),
 340                                &route->ksnr_ipaddr,
 341                                &route->ksnr_myipaddr,
 342                                &conn->ksnc_myipaddr);
 343
 344                         iface = ksocknal_ip2iface(route->ksnr_peer->ksnp_ni,
 345                                                   route->ksnr_myipaddr);
 346                         if (iface != NULL)
 347                                 iface->ksni_nroutes--;
 348                 }
 349                 route->ksnr_myipaddr = conn->ksnc_myipaddr;
 350                 iface = ksocknal_ip2iface(route->ksnr_peer->ksnp_ni,
 351                                           route->ksnr_myipaddr);
 352                 if (iface != NULL)
 353                         iface->ksni_nroutes++;
 354         }
 355
 356         route->ksnr_connected |= (1<<type);
 357         route->ksnr_conn_count++;
 358
 359         /* Successful connection => further attempts can
 360          * proceed immediately */
 361         route->ksnr_retry_interval = 0;
 362 }
 363
 364 static void
 365 ksocknal_add_route_locked (ksock_peer_ni_t *peer_ni, ksock_route_t *route)
 366 {
 367         struct list_head *tmp;
 368         ksock_conn_t     *conn;
 369         ksock_route_t    *route2;
 370
 371         LASSERT(!peer_ni->ksnp_closing);
 372         LASSERT(route->ksnr_peer == NULL);
 373         LASSERT(!route->ksnr_scheduled);
 374         LASSERT(!route->ksnr_connecting);
 375         LASSERT(route->ksnr_connected == 0);
 376
 377         /* LASSERT(unique) */
 378         list_for_each(tmp, &peer_ni->ksnp_routes) {
 379                 route2 = list_entry(tmp, ksock_route_t, ksnr_list);
 380
 381                 if (route2->ksnr_ipaddr == route->ksnr_ipaddr) {
 382                         CERROR("Duplicate route %s %pI4h\n",
 383                                libcfs_id2str(peer_ni->ksnp_id),
 384                                &route->ksnr_ipaddr);
 385                         LBUG();
 386                 }
 387         }
 388
 389         route->ksnr_peer = peer_ni;
 390         ksocknal_peer_addref(peer_ni);
 391         /* peer_ni's routelist takes over my ref on 'route' */
 392         list_add_tail(&route->ksnr_list, &peer_ni->ksnp_routes);
 393
 394         list_for_each(tmp, &peer_ni->ksnp_conns) {
 395                 conn = list_entry(tmp, ksock_conn_t, ksnc_list);
 396
 397                 if (conn->ksnc_ipaddr != route->ksnr_ipaddr)
 398                         continue;
 399
 400                 ksocknal_associate_route_conn_locked(route, conn);
 401                 /* keep going (typed routes) */
 402         }
 403 }
 404
 405 static void
 406 ksocknal_del_route_locked (ksock_route_t *route)
 407 {
 408         ksock_peer_ni_t   *peer_ni = route->ksnr_peer;
 409         ksock_interface_t *iface;
 410         ksock_conn_t      *conn;
 411         struct list_head  *ctmp;
 412         struct list_head  *cnxt;
 413
 414         LASSERT(!route->ksnr_deleted);
 415
 416         /* Close associated conns */
 417         list_for_each_safe(ctmp, cnxt, &peer_ni->ksnp_conns) {
 418                 conn = list_entry(ctmp, ksock_conn_t, ksnc_list);
 419
 420                 if (conn->ksnc_route != route)
 421                         continue;
 422
 423                 ksocknal_close_conn_locked(conn, 0);
 424         }
 425
 426         if (route->ksnr_myipaddr != 0) {
 427                 iface = ksocknal_ip2iface(route->ksnr_peer->ksnp_ni,
 428                                           route->ksnr_myipaddr);
 429                 if (iface != NULL)
 430                         iface->ksni_nroutes--;
 431         }
 432
 433         route->ksnr_deleted = 1;
 434         list_del(&route->ksnr_list);
 435         ksocknal_route_decref(route);           /* drop peer_ni's ref */
 436
 437         if (list_empty(&peer_ni->ksnp_routes) &&
 438             list_empty(&peer_ni->ksnp_conns)) {
 439                 /* I've just removed the last route to a peer_ni with no active
 440                  * connections */
 441                 ksocknal_unlink_peer_locked(peer_ni);
 442         }
 443 }
 444
 445 int
 446 ksocknal_add_peer(struct lnet_ni *ni, struct lnet_process_id id, __u32 ipaddr,
 447                   int port)
 448 {
 449         struct list_head *tmp;
 450         ksock_peer_ni_t  *peer_ni;
 451         ksock_peer_ni_t  *peer2;
 452         ksock_route_t    *route;
 453         ksock_route_t    *route2;
 454         int               rc;
 455
 456         if (id.nid == LNET_NID_ANY ||
 457             id.pid == LNET_PID_ANY)
 458                 return (-EINVAL);
 459
 460         /* Have a brand new peer_ni ready... */
 461         rc = ksocknal_create_peer(&peer_ni, ni, id);
 462         if (rc != 0)
 463                 return rc;
 464
 465         route = ksocknal_create_route (ipaddr, port);
 466         if (route == NULL) {
 467                 ksocknal_peer_decref(peer_ni);
 468                 return (-ENOMEM);
 469         }
 470
 471         write_lock_bh(&ksocknal_data.ksnd_global_lock);
 472
 473         /* always called with a ref on ni, so shutdown can't have started */
 474         LASSERT (((ksock_net_t *) ni->ni_data)->ksnn_shutdown == 0);
 475
 476         peer2 = ksocknal_find_peer_locked(ni, id);
 477         if (peer2 != NULL) {
 478                 ksocknal_peer_decref(peer_ni);
 479                 peer_ni = peer2;
 480         } else {
 481                 /* peer_ni table takes my ref on peer_ni */
 482                 list_add_tail(&peer_ni->ksnp_list,
 483                               ksocknal_nid2peerlist(id.nid));
 484         }
 485
 486         route2 = NULL;
 487         list_for_each(tmp, &peer_ni->ksnp_routes) {
 488                 route2 = list_entry(tmp, ksock_route_t, ksnr_list);
 489
 490                 if (route2->ksnr_ipaddr == ipaddr)
 491                         break;
 492
 493                 route2 = NULL;
 494         }
 495         if (route2 == NULL) {
 496                 ksocknal_add_route_locked(peer_ni, route);
 497                 route->ksnr_share_count++;
 498         } else {
 499                 ksocknal_route_decref(route);
 500                 route2->ksnr_share_count++;
 501         }
 502
 503         write_unlock_bh(&ksocknal_data.ksnd_global_lock);
 504
 505         return 0;
 506 }
 507
 508 static void
 509 ksocknal_del_peer_locked (ksock_peer_ni_t *peer_ni, __u32 ip)
 510 {
 511         ksock_conn_t     *conn;
 512         ksock_route_t    *route;
 513         struct list_head *tmp;
 514         struct list_head *nxt;
 515         int               nshared;
 516
 517         LASSERT(!peer_ni->ksnp_closing);
 518
 519         /* Extra ref prevents peer_ni disappearing until I'm done with it */
 520         ksocknal_peer_addref(peer_ni);
 521
 522         list_for_each_safe(tmp, nxt, &peer_ni->ksnp_routes) {
 523                 route = list_entry(tmp, ksock_route_t, ksnr_list);
 524
 525                 /* no match */
 526                 if (!(ip == 0 || route->ksnr_ipaddr == ip))
 527                         continue;
 528
 529                 route->ksnr_share_count = 0;
 530                 /* This deletes associated conns too */
 531                 ksocknal_del_route_locked(route);
 532         }
 533
 534         nshared = 0;
 535         list_for_each_safe(tmp, nxt, &peer_ni->ksnp_routes) {
 536                 route = list_entry(tmp, ksock_route_t, ksnr_list);
 537                 nshared += route->ksnr_share_count;
 538         }
 539
 540         if (nshared == 0) {
 541                 /* remove everything else if there are no explicit entries
 542                  * left */
 543
 544                 list_for_each_safe(tmp, nxt, &peer_ni->ksnp_routes) {
 545                         route = list_entry(tmp, ksock_route_t, ksnr_list);
 546
 547                         /* we should only be removing auto-entries */
 548                         LASSERT(route->ksnr_share_count == 0);
 549                         ksocknal_del_route_locked(route);
 550                 }
 551
 552                 list_for_each_safe(tmp, nxt, &peer_ni->ksnp_conns) {
 553                         conn = list_entry(tmp, ksock_conn_t, ksnc_list);
 554
 555                         ksocknal_close_conn_locked(conn, 0);
 556                 }
 557         }
 558
 559         ksocknal_peer_decref(peer_ni);
 560                 /* NB peer_ni unlinks itself when last conn/route is removed */
 561 }
 562
 563 static int
 564 ksocknal_del_peer(struct lnet_ni *ni, struct lnet_process_id id, __u32 ip)
 565 {
 566         struct list_head  zombies = LIST_HEAD_INIT(zombies);
 567         struct list_head *ptmp;
 568         struct list_head *pnxt;
 569         ksock_peer_ni_t     *peer_ni;
 570         int               lo;
 571         int               hi;
 572         int               i;
 573         int               rc = -ENOENT;
 574
 575         write_lock_bh(&ksocknal_data.ksnd_global_lock);
 576
 577         if (id.nid != LNET_NID_ANY) {
 578                 hi = (int)(ksocknal_nid2peerlist(id.nid) -
 579                            ksocknal_data.ksnd_peers);
 580                 lo = hi;
 581         } else {
 582                 lo = 0;
 583                 hi = ksocknal_data.ksnd_peer_hash_size - 1;
 584         }
 585
 586         for (i = lo; i <= hi; i++) {
 587                 list_for_each_safe(ptmp, pnxt,
 588                                    &ksocknal_data.ksnd_peers[i]) {
 589                         peer_ni = list_entry(ptmp, ksock_peer_ni_t, ksnp_list);
 590
 591                         if (peer_ni->ksnp_ni != ni)
 592                                 continue;
 593
 594                         if (!((id.nid == LNET_NID_ANY ||
 595                                peer_ni->ksnp_id.nid == id.nid) &&
 596                               (id.pid == LNET_PID_ANY ||
 597                                peer_ni->ksnp_id.pid == id.pid)))
 598                                 continue;
 599
 600                         ksocknal_peer_addref(peer_ni);  /* a ref for me... */
 601
 602                         ksocknal_del_peer_locked(peer_ni, ip);
 603
 604                         if (peer_ni->ksnp_closing &&
 605                             !list_empty(&peer_ni->ksnp_tx_queue)) {
 606                                 LASSERT(list_empty(&peer_ni->ksnp_conns));
 607                                 LASSERT(list_empty(&peer_ni->ksnp_routes));
 608
 609                                 list_splice_init(&peer_ni->ksnp_tx_queue,
 610                                                  &zombies);
 611                         }
 612
 613                         ksocknal_peer_decref(peer_ni);  /* ...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 static ksock_conn_t *
 627 ksocknal_get_conn_by_idx(struct lnet_ni *ni, int index)
 628 {
 629         ksock_peer_ni_t  *peer_ni;
 630         struct list_head *ptmp;
 631         ksock_conn_t     *conn;
 632         struct list_head *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                 list_for_each(ptmp, &ksocknal_data.ksnd_peers[i]) {
 639                         peer_ni = list_entry(ptmp, ksock_peer_ni_t, ksnp_list);
 640
 641                         LASSERT(!peer_ni->ksnp_closing);
 642
 643                         if (peer_ni->ksnp_ni != ni)
 644                                 continue;
 645
 646                         list_for_each(ctmp, &peer_ni->ksnp_conns) {
 647                                 if (index-- > 0)
 648                                         continue;
 649
 650                                 conn = 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 static 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 static int
 688 ksocknal_local_ipvec(struct lnet_ni *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 static 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 static int
 748 ksocknal_select_ips(ksock_peer_ni_t *peer_ni, __u32 *peerips, int n_peerips)
 749 {
 750         rwlock_t                *global_lock = &ksocknal_data.ksnd_global_lock;
 751         ksock_net_t        *net = peer_ni->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_ni->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_ni IPs that match old interfaces, then choose new
 787                  * interfaces to match the remaining peer_ni IPS.
 788                  * We don't forget interfaces we've stopped using; we might
 789                  * start using them again... */
 790
 791                 if (i < peer_ni->ksnp_n_passive_ips) {
 792                         /* Old interface. */
 793                         ip = peer_ni->ksnp_passive_ips[i];
 794                         best_iface = ksocknal_ip2iface(peer_ni->ksnp_ni, ip);
 795
 796                         /* peer_ni passive ips are kept up to date */
 797                         LASSERT(best_iface != NULL);
 798                 } else {
 799                         /* choose a new interface */
 800                         LASSERT (i == peer_ni->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_ni->ksnp_n_passive_ips; k++)
 811                                         if (peer_ni->ksnp_passive_ips[k] == ip)
 812                                                 break;
 813
 814                                 if (k < peer_ni->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                         LASSERT(best_iface != NULL);
 833
 834                         best_iface->ksni_npeers++;
 835                         ip = best_iface->ksni_ipaddr;
 836                         peer_ni->ksnp_passive_ips[i] = ip;
 837                         peer_ni->ksnp_n_passive_ips = i+1;
 838                 }
 839
 840                 /* mark the best matching peer_ni IP used */
 841                 j = ksocknal_match_peerip(best_iface, peerips, n_peerips);
 842                 peerips[j] = 0;
 843         }
 844
 845         /* Overwrite input peer_ni IP addresses */
 846         memcpy(peerips, peer_ni->ksnp_passive_ips, n_ips * sizeof(*peerips));
 847
 848         write_unlock_bh(global_lock);
 849
 850         return (n_ips);
 851 }
 852
 853 static void
 854 ksocknal_create_routes(ksock_peer_ni_t *peer_ni, 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         struct lnet_ni *ni = peer_ni->ksnp_ni;
 860         ksock_net_t             *net = ni->ni_data;
 861         struct list_head        *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_ni->ksnp_closing) {
 901                         /* peer_ni got closed under me */
 902                         break;
 903                 }
 904
 905                 /* Already got a route? */
 906                 route = NULL;
 907                 list_for_each(rtmp, &peer_ni->ksnp_routes) {
 908                         route = 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                         list_for_each(rtmp, &peer_ni->ksnp_routes) {
 930                                 route = 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_ni, 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(struct lnet_ni *ni, struct socket *sock)
 973 {
 974         ksock_connreq_t *cr;
 975         int              rc;
 976         __u32            peer_ip;
 977         int              peer_port;
 978
 979         rc = lnet_sock_getaddr(sock, true, &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                                    "%pI4h: memory exhausted\n", &peer_ip);
 986                 return -ENOMEM;
 987         }
 988
 989         lnet_ni_addref(ni);
 990         cr->ksncr_ni   = ni;
 991         cr->ksncr_sock = sock;
 992
 993         spin_lock_bh(&ksocknal_data.ksnd_connd_lock);
 994
 995         list_add_tail(&cr->ksncr_list, &ksocknal_data.ksnd_connd_connreqs);
 996         wake_up(&ksocknal_data.ksnd_connd_waitq);
 997
 998         spin_unlock_bh(&ksocknal_data.ksnd_connd_lock);
 999         return 0;
1000 }
1001
1002 static int
1003 ksocknal_connecting (ksock_peer_ni_t *peer_ni, __u32 ipaddr)
1004 {
1005         ksock_route_t *route;
1006
1007         list_for_each_entry(route, &peer_ni->ksnp_routes, ksnr_list) {
1008                 if (route->ksnr_ipaddr == ipaddr)
1009                         return route->ksnr_connecting;
1010         }
1011         return 0;
1012 }
1013
1014 int
1015 ksocknal_create_conn(struct lnet_ni *ni, ksock_route_t *route,
1016                      struct socket *sock, int type)
1017 {
1018         rwlock_t                *global_lock = &ksocknal_data.ksnd_global_lock;
1019         struct list_head        zombies = LIST_HEAD_INIT(zombies);
1020         struct lnet_process_id peerid;
1021         struct list_head        *tmp;
1022         __u64              incarnation;
1023         ksock_conn_t      *conn;
1024         ksock_conn_t      *conn2;
1025         ksock_peer_ni_t      *peer_ni = NULL;
1026         ksock_peer_ni_t      *peer2;
1027         ksock_sched_t     *sched;
1028         struct ksock_hello_msg *hello;
1029         int                cpt;
1030         ksock_tx_t        *tx;
1031         ksock_tx_t        *txtmp;
1032         int                rc;
1033         int                active;
1034         char              *warn = NULL;
1035
1036         active = (route != NULL);
1037
1038         LASSERT (active == (type != SOCKLND_CONN_NONE));
1039
1040         LIBCFS_ALLOC(conn, sizeof(*conn));
1041         if (conn == NULL) {
1042                 rc = -ENOMEM;
1043                 goto failed_0;
1044         }
1045
1046         conn->ksnc_peer = NULL;
1047         conn->ksnc_route = NULL;
1048         conn->ksnc_sock = sock;
1049         /* 2 ref, 1 for conn, another extra ref prevents socket
1050          * being closed before establishment of connection */
1051         atomic_set (&conn->ksnc_sock_refcount, 2);
1052         conn->ksnc_type = type;
1053         ksocknal_lib_save_callback(sock, conn);
1054         atomic_set (&conn->ksnc_conn_refcount, 1); /* 1 ref for me */
1055
1056         conn->ksnc_rx_ready = 0;
1057         conn->ksnc_rx_scheduled = 0;
1058
1059         INIT_LIST_HEAD(&conn->ksnc_tx_queue);
1060         conn->ksnc_tx_ready = 0;
1061         conn->ksnc_tx_scheduled = 0;
1062         conn->ksnc_tx_carrier = NULL;
1063         atomic_set (&conn->ksnc_tx_nob, 0);
1064
1065         LIBCFS_ALLOC(hello, offsetof(struct ksock_hello_msg,
1066                                      kshm_ips[LNET_MAX_INTERFACES]));
1067         if (hello == NULL) {
1068                 rc = -ENOMEM;
1069                 goto failed_1;
1070         }
1071
1072         /* stash conn's local and remote addrs */
1073         rc = ksocknal_lib_get_conn_addrs (conn);
1074         if (rc != 0)
1075                 goto failed_1;
1076
1077         /* Find out/confirm peer_ni's NID and connection type and get the
1078          * vector of interfaces she's willing to let me connect to.
1079          * Passive connections use the listener timeout since the peer_ni sends
1080          * eagerly */
1081
1082         if (active) {
1083                 peer_ni = route->ksnr_peer;
1084                 LASSERT(ni == peer_ni->ksnp_ni);
1085
1086                 /* Active connection sends HELLO eagerly */
1087                 hello->kshm_nips = ksocknal_local_ipvec(ni, hello->kshm_ips);
1088                 peerid = peer_ni->ksnp_id;
1089
1090                 write_lock_bh(global_lock);
1091                 conn->ksnc_proto = peer_ni->ksnp_proto;
1092                 write_unlock_bh(global_lock);
1093
1094                 if (conn->ksnc_proto == NULL) {
1095                          conn->ksnc_proto = &ksocknal_protocol_v3x;
1096 #if SOCKNAL_VERSION_DEBUG
1097                          if (*ksocknal_tunables.ksnd_protocol == 2)
1098                                  conn->ksnc_proto = &ksocknal_protocol_v2x;
1099                          else if (*ksocknal_tunables.ksnd_protocol == 1)
1100                                  conn->ksnc_proto = &ksocknal_protocol_v1x;
1101 #endif
1102                 }
1103
1104                 rc = ksocknal_send_hello (ni, conn, peerid.nid, hello);
1105                 if (rc != 0)
1106                         goto failed_1;
1107         } else {
1108                 peerid.nid = LNET_NID_ANY;
1109                 peerid.pid = LNET_PID_ANY;
1110
1111                 /* Passive, get protocol from peer_ni */
1112                 conn->ksnc_proto = NULL;
1113         }
1114
1115         rc = ksocknal_recv_hello (ni, conn, hello, &peerid, &incarnation);
1116         if (rc < 0)
1117                 goto failed_1;
1118
1119         LASSERT (rc == 0 || active);
1120         LASSERT (conn->ksnc_proto != NULL);
1121         LASSERT (peerid.nid != LNET_NID_ANY);
1122
1123         cpt = lnet_cpt_of_nid(peerid.nid, ni);
1124
1125         if (active) {
1126                 ksocknal_peer_addref(peer_ni);
1127                 write_lock_bh(global_lock);
1128         } else {
1129                 rc = ksocknal_create_peer(&peer_ni, ni, peerid);
1130                 if (rc != 0)
1131                         goto failed_1;
1132
1133                 write_lock_bh(global_lock);
1134
1135                 /* called with a ref on ni, so shutdown can't have started */
1136                 LASSERT (((ksock_net_t *) ni->ni_data)->ksnn_shutdown == 0);
1137
1138                 peer2 = ksocknal_find_peer_locked(ni, peerid);
1139                 if (peer2 == NULL) {
1140                         /* NB this puts an "empty" peer_ni in the peer_ni
1141                          * table (which takes my ref) */
1142                         list_add_tail(&peer_ni->ksnp_list,
1143                                       ksocknal_nid2peerlist(peerid.nid));
1144                 } else {
1145                         ksocknal_peer_decref(peer_ni);
1146                         peer_ni = peer2;
1147                 }
1148
1149                 /* +1 ref for me */
1150                 ksocknal_peer_addref(peer_ni);
1151                 peer_ni->ksnp_accepting++;
1152
1153                 /* Am I already connecting to this guy?  Resolve in
1154                  * favour of higher NID... */
1155                 if (peerid.nid < ni->ni_nid &&
1156                     ksocknal_connecting(peer_ni, conn->ksnc_ipaddr)) {
1157                         rc = EALREADY;
1158                         warn = "connection race resolution";
1159                         goto failed_2;
1160                 }
1161         }
1162
1163         if (peer_ni->ksnp_closing ||
1164             (active && route->ksnr_deleted)) {
1165                 /* peer_ni/route got closed under me */
1166                 rc = -ESTALE;
1167                 warn = "peer_ni/route removed";
1168                 goto failed_2;
1169         }
1170
1171         if (peer_ni->ksnp_proto == NULL) {
1172                 /* Never connected before.
1173                  * NB recv_hello may have returned EPROTO to signal my peer_ni
1174                  * wants a different protocol than the one I asked for.
1175                  */
1176                 LASSERT(list_empty(&peer_ni->ksnp_conns));
1177
1178                 peer_ni->ksnp_proto = conn->ksnc_proto;
1179                 peer_ni->ksnp_incarnation = incarnation;
1180         }
1181
1182         if (peer_ni->ksnp_proto != conn->ksnc_proto ||
1183             peer_ni->ksnp_incarnation != incarnation) {
1184                 /* peer_ni rebooted or I've got the wrong protocol version */
1185                 ksocknal_close_peer_conns_locked(peer_ni, 0, 0);
1186
1187                 peer_ni->ksnp_proto = NULL;
1188                 rc = ESTALE;
1189                 warn = peer_ni->ksnp_incarnation != incarnation ?
1190                        "peer_ni rebooted" :
1191                        "wrong proto version";
1192                 goto failed_2;
1193         }
1194
1195         switch (rc) {
1196         default:
1197                 LBUG();
1198         case 0:
1199                 break;
1200         case EALREADY:
1201                 warn = "lost conn race";
1202                 goto failed_2;
1203         case EPROTO:
1204                 warn = "retry with different protocol version";
1205                 goto failed_2;
1206         }
1207
1208         /* Refuse to duplicate an existing connection, unless this is a
1209          * loopback connection */
1210         if (conn->ksnc_ipaddr != conn->ksnc_myipaddr) {
1211                 list_for_each(tmp, &peer_ni->ksnp_conns) {
1212                         conn2 = list_entry(tmp, ksock_conn_t, ksnc_list);
1213
1214                         if (conn2->ksnc_ipaddr != conn->ksnc_ipaddr ||
1215                             conn2->ksnc_myipaddr != conn->ksnc_myipaddr ||
1216                             conn2->ksnc_type != conn->ksnc_type)
1217                                 continue;
1218
1219                         /* Reply on a passive connection attempt so the peer_ni
1220                          * realises we're connected. */
1221                         LASSERT (rc == 0);
1222                         if (!active)
1223                                 rc = EALREADY;
1224
1225                         warn = "duplicate";
1226                         goto failed_2;
1227                 }
1228         }
1229
1230         /* If the connection created by this route didn't bind to the IP
1231          * address the route connected to, the connection/route matching
1232          * code below probably isn't going to work. */
1233         if (active &&
1234             route->ksnr_ipaddr != conn->ksnc_ipaddr) {
1235                 CERROR("Route %s %pI4h connected to %pI4h\n",
1236                        libcfs_id2str(peer_ni->ksnp_id),
1237                        &route->ksnr_ipaddr,
1238                        &conn->ksnc_ipaddr);
1239         }
1240
1241         /* Search for a route corresponding to the new connection and
1242          * create an association.  This allows incoming connections created
1243          * by routes in my peer_ni to match my own route entries so I don't
1244          * continually create duplicate routes. */
1245         list_for_each(tmp, &peer_ni->ksnp_routes) {
1246                 route = list_entry(tmp, ksock_route_t, ksnr_list);
1247
1248                 if (route->ksnr_ipaddr != conn->ksnc_ipaddr)
1249                         continue;
1250
1251                 ksocknal_associate_route_conn_locked(route, conn);
1252                 break;
1253         }
1254
1255         conn->ksnc_peer = peer_ni;                 /* conn takes my ref on peer_ni */
1256         peer_ni->ksnp_last_alive = ktime_get_real_seconds();
1257         peer_ni->ksnp_send_keepalive = 0;
1258         peer_ni->ksnp_error = 0;
1259
1260         sched = ksocknal_choose_scheduler_locked(cpt);
1261         sched->kss_nconns++;
1262         conn->ksnc_scheduler = sched;
1263
1264         conn->ksnc_tx_last_post = ktime_get_real_seconds();
1265         /* Set the deadline for the outgoing HELLO to drain */
1266         conn->ksnc_tx_bufnob = sock->sk->sk_wmem_queued;
1267         conn->ksnc_tx_deadline = cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
1268         smp_mb();   /* order with adding to peer_ni's conn list */
1269
1270         list_add(&conn->ksnc_list, &peer_ni->ksnp_conns);
1271         ksocknal_conn_addref(conn);
1272
1273         ksocknal_new_packet(conn, 0);
1274
1275         conn->ksnc_zc_capable = ksocknal_lib_zc_capable(conn);
1276
1277         /* Take packets blocking for this connection. */
1278         list_for_each_entry_safe(tx, txtmp, &peer_ni->ksnp_tx_queue, tx_list) {
1279                 if (conn->ksnc_proto->pro_match_tx(conn, tx, tx->tx_nonblk) ==
1280                     SOCKNAL_MATCH_NO)
1281                         continue;
1282
1283                 list_del(&tx->tx_list);
1284                 ksocknal_queue_tx_locked(tx, conn);
1285         }
1286
1287         write_unlock_bh(global_lock);
1288
1289         /* We've now got a new connection.  Any errors from here on are just
1290          * like "normal" comms errors and we close the connection normally.
1291          * NB (a) we still have to send the reply HELLO for passive
1292          *        connections,
1293          *    (b) normal I/O on the conn is blocked until I setup and call the
1294          *        socket callbacks.
1295          */
1296
1297         CDEBUG(D_NET, "New conn %s p %d.x %pI4h -> %pI4h/%d"
1298                " incarnation:%lld sched[%d:%d]\n",
1299                libcfs_id2str(peerid), conn->ksnc_proto->pro_version,
1300                &conn->ksnc_myipaddr, &conn->ksnc_ipaddr,
1301                conn->ksnc_port, incarnation, cpt,
1302                (int)(sched - &sched->kss_info->ksi_scheds[0]));
1303
1304         if (active) {
1305                 /* additional routes after interface exchange? */
1306                 ksocknal_create_routes(peer_ni, conn->ksnc_port,
1307                                        hello->kshm_ips, hello->kshm_nips);
1308         } else {
1309                 hello->kshm_nips = ksocknal_select_ips(peer_ni, hello->kshm_ips,
1310                                                        hello->kshm_nips);
1311                 rc = ksocknal_send_hello(ni, conn, peerid.nid, hello);
1312         }
1313
1314         LIBCFS_FREE(hello, offsetof(struct ksock_hello_msg,
1315                                     kshm_ips[LNET_MAX_INTERFACES]));
1316
1317         /* setup the socket AFTER I've received hello (it disables
1318          * SO_LINGER).  I might call back to the acceptor who may want
1319          * to send a protocol version response and then close the
1320          * socket; this ensures the socket only tears down after the
1321          * response has been sent. */
1322         if (rc == 0)
1323                 rc = ksocknal_lib_setup_sock(sock);
1324
1325         write_lock_bh(global_lock);
1326
1327         /* NB my callbacks block while I hold ksnd_global_lock */
1328         ksocknal_lib_set_callback(sock, conn);
1329
1330         if (!active)
1331                 peer_ni->ksnp_accepting--;
1332
1333         write_unlock_bh(global_lock);
1334
1335         if (rc != 0) {
1336                 write_lock_bh(global_lock);
1337                 if (!conn->ksnc_closing) {
1338                         /* could be closed by another thread */
1339                         ksocknal_close_conn_locked(conn, rc);
1340                 }
1341                 write_unlock_bh(global_lock);
1342         } else if (ksocknal_connsock_addref(conn) == 0) {
1343                 /* Allow I/O to proceed. */
1344                 ksocknal_read_callback(conn);
1345                 ksocknal_write_callback(conn);
1346                 ksocknal_connsock_decref(conn);
1347         }
1348
1349         ksocknal_connsock_decref(conn);
1350         ksocknal_conn_decref(conn);
1351         return rc;
1352
1353 failed_2:
1354         if (!peer_ni->ksnp_closing &&
1355             list_empty(&peer_ni->ksnp_conns) &&
1356             list_empty(&peer_ni->ksnp_routes)) {
1357                 list_add(&zombies, &peer_ni->ksnp_tx_queue);
1358                 list_del_init(&peer_ni->ksnp_tx_queue);
1359                 ksocknal_unlink_peer_locked(peer_ni);
1360         }
1361
1362         write_unlock_bh(global_lock);
1363
1364         if (warn != NULL) {
1365                 if (rc < 0)
1366                         CERROR("Not creating conn %s type %d: %s\n",
1367                                libcfs_id2str(peerid), conn->ksnc_type, warn);
1368                 else
1369                         CDEBUG(D_NET, "Not creating conn %s type %d: %s\n",
1370                               libcfs_id2str(peerid), conn->ksnc_type, warn);
1371         }
1372
1373         if (!active) {
1374                 if (rc > 0) {
1375                         /* Request retry by replying with CONN_NONE
1376                          * ksnc_proto has been set already */
1377                         conn->ksnc_type = SOCKLND_CONN_NONE;
1378                         hello->kshm_nips = 0;
1379                         ksocknal_send_hello(ni, conn, peerid.nid, hello);
1380                 }
1381
1382                 write_lock_bh(global_lock);
1383                 peer_ni->ksnp_accepting--;
1384                 write_unlock_bh(global_lock);
1385         }
1386
1387         ksocknal_txlist_done(ni, &zombies, 1);
1388         ksocknal_peer_decref(peer_ni);
1389
1390 failed_1:
1391         if (hello != NULL)
1392                 LIBCFS_FREE(hello, offsetof(struct ksock_hello_msg,
1393                                             kshm_ips[LNET_MAX_INTERFACES]));
1394
1395         LIBCFS_FREE(conn, sizeof(*conn));
1396
1397 failed_0:
1398         sock_release(sock);
1399         return rc;
1400 }
1401
1402 void
1403 ksocknal_close_conn_locked (ksock_conn_t *conn, int error)
1404 {
1405         /* This just does the immmediate housekeeping, and queues the
1406          * connection for the reaper to terminate.
1407          * Caller holds ksnd_global_lock exclusively in irq context */
1408         ksock_peer_ni_t      *peer_ni = conn->ksnc_peer;
1409         ksock_route_t     *route;
1410         ksock_conn_t      *conn2;
1411         struct list_head  *tmp;
1412
1413         LASSERT(peer_ni->ksnp_error == 0);
1414         LASSERT(!conn->ksnc_closing);
1415         conn->ksnc_closing = 1;
1416
1417         /* ksnd_deathrow_conns takes over peer_ni's ref */
1418         list_del(&conn->ksnc_list);
1419
1420         route = conn->ksnc_route;
1421         if (route != NULL) {
1422                 /* dissociate conn from route... */
1423                 LASSERT(!route->ksnr_deleted);
1424                 LASSERT((route->ksnr_connected & (1 << conn->ksnc_type)) != 0);
1425
1426                 conn2 = NULL;
1427                 list_for_each(tmp, &peer_ni->ksnp_conns) {
1428                         conn2 = list_entry(tmp, ksock_conn_t, ksnc_list);
1429
1430                         if (conn2->ksnc_route == route &&
1431                             conn2->ksnc_type == conn->ksnc_type)
1432                                 break;
1433
1434                         conn2 = NULL;
1435                 }
1436                 if (conn2 == NULL)
1437                         route->ksnr_connected &= ~(1 << conn->ksnc_type);
1438
1439                 conn->ksnc_route = NULL;
1440
1441                 ksocknal_route_decref(route);   /* drop conn's ref on route */
1442         }
1443
1444         if (list_empty(&peer_ni->ksnp_conns)) {
1445                 /* No more connections to this peer_ni */
1446
1447                 if (!list_empty(&peer_ni->ksnp_tx_queue)) {
1448                                 ksock_tx_t *tx;
1449
1450                         LASSERT(conn->ksnc_proto == &ksocknal_protocol_v3x);
1451
1452                         /* throw them to the last connection...,
1453                          * these TXs will be send to /dev/null by scheduler */
1454                         list_for_each_entry(tx, &peer_ni->ksnp_tx_queue,
1455                                             tx_list)
1456                                 ksocknal_tx_prep(conn, tx);
1457
1458                         spin_lock_bh(&conn->ksnc_scheduler->kss_lock);
1459                         list_splice_init(&peer_ni->ksnp_tx_queue,
1460                                          &conn->ksnc_tx_queue);
1461                         spin_unlock_bh(&conn->ksnc_scheduler->kss_lock);
1462                 }
1463
1464                 /* renegotiate protocol version */
1465                 peer_ni->ksnp_proto = NULL;
1466                 /* stash last conn close reason */
1467                 peer_ni->ksnp_error = error;
1468
1469                 if (list_empty(&peer_ni->ksnp_routes)) {
1470                         /* I've just closed last conn belonging to a
1471                          * peer_ni with no routes to it */
1472                         ksocknal_unlink_peer_locked(peer_ni);
1473                 }
1474         }
1475
1476         spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
1477
1478         list_add_tail(&conn->ksnc_list,
1479                       &ksocknal_data.ksnd_deathrow_conns);
1480         wake_up(&ksocknal_data.ksnd_reaper_waitq);
1481
1482         spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
1483 }
1484
1485 void
1486 ksocknal_peer_failed (ksock_peer_ni_t *peer_ni)
1487 {
1488         int        notify = 0;
1489         cfs_time_t last_alive = 0;
1490
1491         /* There has been a connection failure or comms error; but I'll only
1492          * tell LNET I think the peer_ni is dead if it's to another kernel and
1493          * there are no connections or connection attempts in existence. */
1494
1495         read_lock(&ksocknal_data.ksnd_global_lock);
1496
1497         if ((peer_ni->ksnp_id.pid & LNET_PID_USERFLAG) == 0 &&
1498              list_empty(&peer_ni->ksnp_conns) &&
1499              peer_ni->ksnp_accepting == 0 &&
1500              ksocknal_find_connecting_route_locked(peer_ni) == NULL) {
1501                 notify = 1;
1502                 last_alive = peer_ni->ksnp_last_alive;
1503         }
1504
1505         read_unlock(&ksocknal_data.ksnd_global_lock);
1506
1507         if (notify)
1508                 lnet_notify(peer_ni->ksnp_ni, peer_ni->ksnp_id.nid, 0,
1509                             last_alive);
1510 }
1511
1512 void
1513 ksocknal_finalize_zcreq(ksock_conn_t *conn)
1514 {
1515         ksock_peer_ni_t  *peer_ni = conn->ksnc_peer;
1516         ksock_tx_t       *tx;
1517         ksock_tx_t       *tmp;
1518         struct list_head  zlist = LIST_HEAD_INIT(zlist);
1519
1520         /* NB safe to finalize TXs because closing of socket will
1521          * abort all buffered data */
1522         LASSERT(conn->ksnc_sock == NULL);
1523
1524         spin_lock(&peer_ni->ksnp_lock);
1525
1526         list_for_each_entry_safe(tx, tmp, &peer_ni->ksnp_zc_req_list, tx_zc_list) {
1527                 if (tx->tx_conn != conn)
1528                         continue;
1529
1530                 LASSERT(tx->tx_msg.ksm_zc_cookies[0] != 0);
1531
1532                 tx->tx_msg.ksm_zc_cookies[0] = 0;
1533                 tx->tx_zc_aborted = 1;  /* mark it as not-acked */
1534                 list_del(&tx->tx_zc_list);
1535                 list_add(&tx->tx_zc_list, &zlist);
1536         }
1537
1538         spin_unlock(&peer_ni->ksnp_lock);
1539
1540         while (!list_empty(&zlist)) {
1541                 tx = list_entry(zlist.next, ksock_tx_t, tx_zc_list);
1542
1543                 list_del(&tx->tx_zc_list);
1544                 ksocknal_tx_decref(tx);
1545         }
1546 }
1547
1548 void
1549 ksocknal_terminate_conn(ksock_conn_t *conn)
1550 {
1551         /* This gets called by the reaper (guaranteed thread context) to
1552          * disengage the socket from its callbacks and close it.
1553          * ksnc_refcount will eventually hit zero, and then the reaper will
1554          * destroy it. */
1555         ksock_peer_ni_t     *peer_ni = conn->ksnc_peer;
1556         ksock_sched_t    *sched = conn->ksnc_scheduler;
1557         int               failed = 0;
1558
1559         LASSERT(conn->ksnc_closing);
1560
1561         /* wake up the scheduler to "send" all remaining packets to /dev/null */
1562         spin_lock_bh(&sched->kss_lock);
1563
1564         /* a closing conn is always ready to tx */
1565         conn->ksnc_tx_ready = 1;
1566
1567         if (!conn->ksnc_tx_scheduled &&
1568             !list_empty(&conn->ksnc_tx_queue)) {
1569                 list_add_tail(&conn->ksnc_tx_list,
1570                                &sched->kss_tx_conns);
1571                 conn->ksnc_tx_scheduled = 1;
1572                 /* extra ref for scheduler */
1573                 ksocknal_conn_addref(conn);
1574
1575                 wake_up (&sched->kss_waitq);
1576         }
1577
1578         spin_unlock_bh(&sched->kss_lock);
1579
1580         /* serialise with callbacks */
1581         write_lock_bh(&ksocknal_data.ksnd_global_lock);
1582
1583         ksocknal_lib_reset_callback(conn->ksnc_sock, conn);
1584
1585         /* OK, so this conn may not be completely disengaged from its
1586          * scheduler yet, but it _has_ committed to terminate... */
1587         conn->ksnc_scheduler->kss_nconns--;
1588
1589         if (peer_ni->ksnp_error != 0) {
1590                 /* peer_ni's last conn closed in error */
1591                 LASSERT(list_empty(&peer_ni->ksnp_conns));
1592                 failed = 1;
1593                 peer_ni->ksnp_error = 0;     /* avoid multiple notifications */
1594         }
1595
1596         write_unlock_bh(&ksocknal_data.ksnd_global_lock);
1597
1598         if (failed)
1599                 ksocknal_peer_failed(peer_ni);
1600
1601         /* The socket is closed on the final put; either here, or in
1602          * ksocknal_{send,recv}msg().  Since we set up the linger2 option
1603          * when the connection was established, this will close the socket
1604          * immediately, aborting anything buffered in it. Any hung
1605          * zero-copy transmits will therefore complete in finite time. */
1606         ksocknal_connsock_decref(conn);
1607 }
1608
1609 void
1610 ksocknal_queue_zombie_conn (ksock_conn_t *conn)
1611 {
1612         /* Queue the conn for the reaper to destroy */
1613
1614         LASSERT(atomic_read(&conn->ksnc_conn_refcount) == 0);
1615         spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
1616
1617         list_add_tail(&conn->ksnc_list, &ksocknal_data.ksnd_zombie_conns);
1618         wake_up(&ksocknal_data.ksnd_reaper_waitq);
1619
1620         spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
1621 }
1622
1623 void
1624 ksocknal_destroy_conn (ksock_conn_t *conn)
1625 {
1626         cfs_time_t      last_rcv;
1627
1628         /* Final coup-de-grace of the reaper */
1629         CDEBUG (D_NET, "connection %p\n", conn);
1630
1631         LASSERT (atomic_read (&conn->ksnc_conn_refcount) == 0);
1632         LASSERT (atomic_read (&conn->ksnc_sock_refcount) == 0);
1633         LASSERT (conn->ksnc_sock == NULL);
1634         LASSERT (conn->ksnc_route == NULL);
1635         LASSERT (!conn->ksnc_tx_scheduled);
1636         LASSERT (!conn->ksnc_rx_scheduled);
1637         LASSERT(list_empty(&conn->ksnc_tx_queue));
1638
1639         /* complete current receive if any */
1640         switch (conn->ksnc_rx_state) {
1641         case SOCKNAL_RX_LNET_PAYLOAD:
1642                 last_rcv = conn->ksnc_rx_deadline -
1643                            cfs_time_seconds(*ksocknal_tunables.ksnd_timeout);
1644                 CERROR("Completing partial receive from %s[%d], "
1645                        "ip %pI4h:%d, with error, wanted: %d, left: %d, "
1646                        "last alive is %ld secs ago\n",
1647                        libcfs_id2str(conn->ksnc_peer->ksnp_id), conn->ksnc_type,
1648                        &conn->ksnc_ipaddr, conn->ksnc_port,
1649                        conn->ksnc_rx_nob_wanted, conn->ksnc_rx_nob_left,
1650                        cfs_duration_sec(cfs_time_sub(ktime_get_real_seconds(),
1651                                         last_rcv)));
1652                 lnet_finalize (conn->ksnc_peer->ksnp_ni,
1653                                conn->ksnc_cookie, -EIO);
1654                 break;
1655         case SOCKNAL_RX_LNET_HEADER:
1656                 if (conn->ksnc_rx_started)
1657                         CERROR("Incomplete receive of lnet header from %s, "
1658                                "ip %pI4h:%d, with error, protocol: %d.x.\n",
1659                                libcfs_id2str(conn->ksnc_peer->ksnp_id),
1660                                &conn->ksnc_ipaddr, conn->ksnc_port,
1661                                conn->ksnc_proto->pro_version);
1662                 break;
1663         case SOCKNAL_RX_KSM_HEADER:
1664                 if (conn->ksnc_rx_started)
1665                         CERROR("Incomplete receive of ksock message from %s, "
1666                                "ip %pI4h:%d, with error, protocol: %d.x.\n",
1667                                libcfs_id2str(conn->ksnc_peer->ksnp_id),
1668                                &conn->ksnc_ipaddr, conn->ksnc_port,
1669                                conn->ksnc_proto->pro_version);
1670                 break;
1671         case SOCKNAL_RX_SLOP:
1672                 if (conn->ksnc_rx_started)
1673                         CERROR("Incomplete receive of slops from %s, "
1674                                "ip %pI4h:%d, with error\n",
1675                                libcfs_id2str(conn->ksnc_peer->ksnp_id),
1676                                &conn->ksnc_ipaddr, conn->ksnc_port);
1677                break;
1678         default:
1679                 LBUG ();
1680                 break;
1681         }
1682
1683         ksocknal_peer_decref(conn->ksnc_peer);
1684
1685         LIBCFS_FREE (conn, sizeof (*conn));
1686 }
1687
1688 int
1689 ksocknal_close_peer_conns_locked (ksock_peer_ni_t *peer_ni, __u32 ipaddr, int why)
1690 {
1691         ksock_conn_t       *conn;
1692         struct list_head         *ctmp;
1693         struct list_head         *cnxt;
1694         int                 count = 0;
1695
1696         list_for_each_safe(ctmp, cnxt, &peer_ni->ksnp_conns) {
1697                 conn = list_entry(ctmp, ksock_conn_t, ksnc_list);
1698
1699                 if (ipaddr == 0 ||
1700                     conn->ksnc_ipaddr == ipaddr) {
1701                         count++;
1702                         ksocknal_close_conn_locked (conn, why);
1703                 }
1704         }
1705
1706         return (count);
1707 }
1708
1709 int
1710 ksocknal_close_conn_and_siblings (ksock_conn_t *conn, int why)
1711 {
1712         ksock_peer_ni_t     *peer_ni = conn->ksnc_peer;
1713         __u32             ipaddr = conn->ksnc_ipaddr;
1714         int               count;
1715
1716         write_lock_bh(&ksocknal_data.ksnd_global_lock);
1717
1718         count = ksocknal_close_peer_conns_locked (peer_ni, ipaddr, why);
1719
1720         write_unlock_bh(&ksocknal_data.ksnd_global_lock);
1721
1722         return (count);
1723 }
1724
1725 int
1726 ksocknal_close_matching_conns(struct lnet_process_id id, __u32 ipaddr)
1727 {
1728         ksock_peer_ni_t       *peer_ni;
1729         struct list_head         *ptmp;
1730         struct list_head         *pnxt;
1731         int                 lo;
1732         int                 hi;
1733         int                 i;
1734         int                 count = 0;
1735
1736         write_lock_bh(&ksocknal_data.ksnd_global_lock);
1737
1738         if (id.nid != LNET_NID_ANY)
1739                 lo = hi = (int)(ksocknal_nid2peerlist(id.nid) - ksocknal_data.ksnd_peers);
1740         else {
1741                 lo = 0;
1742                 hi = ksocknal_data.ksnd_peer_hash_size - 1;
1743         }
1744
1745         for (i = lo; i <= hi; i++) {
1746                 list_for_each_safe(ptmp, pnxt, &ksocknal_data.ksnd_peers[i]) {
1747
1748                         peer_ni = list_entry(ptmp, ksock_peer_ni_t, ksnp_list);
1749
1750                         if (!((id.nid == LNET_NID_ANY || id.nid == peer_ni->ksnp_id.nid) &&
1751                               (id.pid == LNET_PID_ANY || id.pid == peer_ni->ksnp_id.pid)))
1752                                 continue;
1753
1754                         count += ksocknal_close_peer_conns_locked (peer_ni, ipaddr, 0);
1755                 }
1756         }
1757
1758         write_unlock_bh(&ksocknal_data.ksnd_global_lock);
1759
1760         /* wildcards always succeed */
1761         if (id.nid == LNET_NID_ANY || id.pid == LNET_PID_ANY || ipaddr == 0)
1762                 return (0);
1763
1764         return (count == 0 ? -ENOENT : 0);
1765 }
1766
1767 void
1768 ksocknal_notify(struct lnet_ni *ni, lnet_nid_t gw_nid, int alive)
1769 {
1770         /* The router is telling me she's been notified of a change in
1771          * gateway state....
1772          */
1773         struct lnet_process_id id = {
1774                 .nid    = gw_nid,
1775                 .pid    = LNET_PID_ANY,
1776         };
1777
1778         CDEBUG (D_NET, "gw %s %s\n", libcfs_nid2str(gw_nid),
1779                 alive ? "up" : "down");
1780
1781         if (!alive) {
1782                 /* If the gateway crashed, close all open connections... */
1783                 ksocknal_close_matching_conns (id, 0);
1784                 return;
1785         }
1786
1787         /* ...otherwise do nothing.  We can only establish new connections
1788          * if we have autroutes, and these connect on demand. */
1789 }
1790
1791 void
1792 ksocknal_query(struct lnet_ni *ni, lnet_nid_t nid, cfs_time_t *when)
1793 {
1794         int connect = 1;
1795         time64_t last_alive = 0;
1796         time64_t now = ktime_get_real_seconds();
1797         ksock_peer_ni_t *peer_ni = NULL;
1798         rwlock_t *glock = &ksocknal_data.ksnd_global_lock;
1799         struct lnet_process_id id = {
1800                 .nid = nid,
1801                 .pid = LNET_PID_LUSTRE,
1802         };
1803
1804         read_lock(glock);
1805
1806         peer_ni = ksocknal_find_peer_locked(ni, id);
1807         if (peer_ni != NULL) {
1808                 struct list_head       *tmp;
1809                 ksock_conn_t     *conn;
1810                 int               bufnob;
1811
1812                 list_for_each(tmp, &peer_ni->ksnp_conns) {
1813                         conn = list_entry(tmp, ksock_conn_t, ksnc_list);
1814                         bufnob = conn->ksnc_sock->sk->sk_wmem_queued;
1815
1816                         if (bufnob < conn->ksnc_tx_bufnob) {
1817                                 /* something got ACKed */
1818                                 conn->ksnc_tx_deadline =
1819                                         cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
1820                                 peer_ni->ksnp_last_alive = now;
1821                                 conn->ksnc_tx_bufnob = bufnob;
1822                         }
1823                 }
1824
1825                 last_alive = peer_ni->ksnp_last_alive;
1826                 if (ksocknal_find_connectable_route_locked(peer_ni) == NULL)
1827                         connect = 0;
1828         }
1829
1830         read_unlock(glock);
1831
1832         if (last_alive != 0)
1833                 *when = last_alive;
1834
1835         CDEBUG(D_NET, "peer_ni %s %p, alive %ld secs ago, connect %d\n",
1836                libcfs_nid2str(nid), peer_ni,
1837                last_alive ? cfs_duration_sec(now - last_alive) : -1,
1838                connect);
1839
1840         if (!connect)
1841                 return;
1842
1843         ksocknal_add_peer(ni, id, LNET_NIDADDR(nid), lnet_acceptor_port());
1844
1845         write_lock_bh(glock);
1846
1847         peer_ni = ksocknal_find_peer_locked(ni, id);
1848         if (peer_ni != NULL)
1849                 ksocknal_launch_all_connections_locked(peer_ni);
1850
1851         write_unlock_bh(glock);
1852         return;
1853 }
1854
1855 static void
1856 ksocknal_push_peer (ksock_peer_ni_t *peer_ni)
1857 {
1858         int               index;
1859         int               i;
1860         struct list_head       *tmp;
1861         ksock_conn_t     *conn;
1862
1863         for (index = 0; ; index++) {
1864                 read_lock(&ksocknal_data.ksnd_global_lock);
1865
1866                 i = 0;
1867                 conn = NULL;
1868
1869                 list_for_each(tmp, &peer_ni->ksnp_conns) {
1870                         if (i++ == index) {
1871                                 conn = list_entry(tmp, ksock_conn_t,
1872                                                        ksnc_list);
1873                                 ksocknal_conn_addref(conn);
1874                                 break;
1875                         }
1876                 }
1877
1878                 read_unlock(&ksocknal_data.ksnd_global_lock);
1879
1880                 if (conn == NULL)
1881                         break;
1882
1883                 ksocknal_lib_push_conn (conn);
1884                 ksocknal_conn_decref(conn);
1885         }
1886 }
1887
1888 static int
1889 ksocknal_push(struct lnet_ni *ni, struct lnet_process_id id)
1890 {
1891         struct list_head *start;
1892         struct list_head *end;
1893         struct list_head *tmp;
1894         int               rc = -ENOENT;
1895         unsigned int      hsize = ksocknal_data.ksnd_peer_hash_size;
1896
1897         if (id.nid == LNET_NID_ANY) {
1898                 start = &ksocknal_data.ksnd_peers[0];
1899                 end = &ksocknal_data.ksnd_peers[hsize - 1];
1900         } else {
1901                 start = end = ksocknal_nid2peerlist(id.nid);
1902         }
1903
1904         for (tmp = start; tmp <= end; tmp++) {
1905                 int     peer_off; /* searching offset in peer_ni hash table */
1906
1907                 for (peer_off = 0; ; peer_off++) {
1908                         ksock_peer_ni_t *peer_ni;
1909                         int           i = 0;
1910
1911                         read_lock(&ksocknal_data.ksnd_global_lock);
1912                         list_for_each_entry(peer_ni, tmp, ksnp_list) {
1913                                 if (!((id.nid == LNET_NID_ANY ||
1914                                        id.nid == peer_ni->ksnp_id.nid) &&
1915                                       (id.pid == LNET_PID_ANY ||
1916                                        id.pid == peer_ni->ksnp_id.pid)))
1917                                         continue;
1918
1919                                 if (i++ == peer_off) {
1920                                         ksocknal_peer_addref(peer_ni);
1921                                         break;
1922                                 }
1923                         }
1924                         read_unlock(&ksocknal_data.ksnd_global_lock);
1925
1926                         if (i == 0) /* no match */
1927                                 break;
1928
1929                         rc = 0;
1930                         ksocknal_push_peer(peer_ni);
1931                         ksocknal_peer_decref(peer_ni);
1932                 }
1933         }
1934         return rc;
1935 }
1936
1937 static int
1938 ksocknal_add_interface(struct lnet_ni *ni, __u32 ipaddress, __u32 netmask)
1939 {
1940         ksock_net_t       *net = ni->ni_data;
1941         ksock_interface_t *iface;
1942         int                rc;
1943         int                i;
1944         int                j;
1945         struct list_head        *ptmp;
1946         ksock_peer_ni_t      *peer_ni;
1947         struct list_head        *rtmp;
1948         ksock_route_t     *route;
1949
1950         if (ipaddress == 0 ||
1951             netmask == 0)
1952                 return (-EINVAL);
1953
1954         write_lock_bh(&ksocknal_data.ksnd_global_lock);
1955
1956         iface = ksocknal_ip2iface(ni, ipaddress);
1957         if (iface != NULL) {
1958                 /* silently ignore dups */
1959                 rc = 0;
1960         } else if (net->ksnn_ninterfaces == LNET_MAX_INTERFACES) {
1961                 rc = -ENOSPC;
1962         } else {
1963                 iface = &net->ksnn_interfaces[net->ksnn_ninterfaces++];
1964
1965                 iface->ksni_ipaddr = ipaddress;
1966                 iface->ksni_netmask = netmask;
1967                 iface->ksni_nroutes = 0;
1968                 iface->ksni_npeers = 0;
1969
1970                 for (i = 0; i < ksocknal_data.ksnd_peer_hash_size; i++) {
1971                         list_for_each(ptmp, &ksocknal_data.ksnd_peers[i]) {
1972                                 peer_ni = list_entry(ptmp, ksock_peer_ni_t,
1973                                                       ksnp_list);
1974
1975                                 for (j = 0; j < peer_ni->ksnp_n_passive_ips; j++)
1976                                         if (peer_ni->ksnp_passive_ips[j] == ipaddress)
1977                                                 iface->ksni_npeers++;
1978
1979                                 list_for_each(rtmp, &peer_ni->ksnp_routes) {
1980                                         route = list_entry(rtmp,
1981                                                                ksock_route_t,
1982                                                                ksnr_list);
1983
1984                                         if (route->ksnr_myipaddr == ipaddress)
1985                                                 iface->ksni_nroutes++;
1986                                 }
1987                         }
1988                 }
1989
1990                 rc = 0;
1991                 /* NB only new connections will pay attention to the new interface! */
1992         }
1993
1994         write_unlock_bh(&ksocknal_data.ksnd_global_lock);
1995
1996         return (rc);
1997 }
1998
1999 static void
2000 ksocknal_peer_del_interface_locked(ksock_peer_ni_t *peer_ni, __u32 ipaddr)
2001 {
2002         struct list_head         *tmp;
2003         struct list_head         *nxt;
2004         ksock_route_t      *route;
2005         ksock_conn_t       *conn;
2006         int                 i;
2007         int                 j;
2008
2009         for (i = 0; i < peer_ni->ksnp_n_passive_ips; i++)
2010                 if (peer_ni->ksnp_passive_ips[i] == ipaddr) {
2011                         for (j = i+1; j < peer_ni->ksnp_n_passive_ips; j++)
2012                                 peer_ni->ksnp_passive_ips[j-1] =
2013                                         peer_ni->ksnp_passive_ips[j];
2014                         peer_ni->ksnp_n_passive_ips--;
2015                         break;
2016                 }
2017
2018         list_for_each_safe(tmp, nxt, &peer_ni->ksnp_routes) {
2019                 route = list_entry(tmp, ksock_route_t, ksnr_list);
2020
2021                 if (route->ksnr_myipaddr != ipaddr)
2022                         continue;
2023
2024                 if (route->ksnr_share_count != 0) {
2025                         /* Manually created; keep, but unbind */
2026                         route->ksnr_myipaddr = 0;
2027                 } else {
2028                         ksocknal_del_route_locked(route);
2029                 }
2030         }
2031
2032         list_for_each_safe(tmp, nxt, &peer_ni->ksnp_conns) {
2033                 conn = list_entry(tmp, ksock_conn_t, ksnc_list);
2034
2035                 if (conn->ksnc_myipaddr == ipaddr)
2036                         ksocknal_close_conn_locked (conn, 0);
2037         }
2038 }
2039
2040 static int
2041 ksocknal_del_interface(struct lnet_ni *ni, __u32 ipaddress)
2042 {
2043         ksock_net_t       *net = ni->ni_data;
2044         int                rc = -ENOENT;
2045         struct list_head        *tmp;
2046         struct list_head        *nxt;
2047         ksock_peer_ni_t      *peer_ni;
2048         __u32              this_ip;
2049         int                i;
2050         int                j;
2051
2052         write_lock_bh(&ksocknal_data.ksnd_global_lock);
2053
2054         for (i = 0; i < net->ksnn_ninterfaces; i++) {
2055                 this_ip = net->ksnn_interfaces[i].ksni_ipaddr;
2056
2057                 if (!(ipaddress == 0 ||
2058                       ipaddress == this_ip))
2059                         continue;
2060
2061                 rc = 0;
2062
2063                 for (j = i+1; j < net->ksnn_ninterfaces; j++)
2064                         net->ksnn_interfaces[j-1] =
2065                                 net->ksnn_interfaces[j];
2066
2067                 net->ksnn_ninterfaces--;
2068
2069                 for (j = 0; j < ksocknal_data.ksnd_peer_hash_size; j++) {
2070                         list_for_each_safe(tmp, nxt,
2071                                                &ksocknal_data.ksnd_peers[j]) {
2072                                 peer_ni = list_entry(tmp, ksock_peer_ni_t,
2073                                                       ksnp_list);
2074
2075                                 if (peer_ni->ksnp_ni != ni)
2076                                         continue;
2077
2078                                 ksocknal_peer_del_interface_locked(peer_ni, this_ip);
2079                         }
2080                 }
2081         }
2082
2083         write_unlock_bh(&ksocknal_data.ksnd_global_lock);
2084
2085         return (rc);
2086 }
2087
2088 int
2089 ksocknal_ctl(struct lnet_ni *ni, unsigned int cmd, void *arg)
2090 {
2091         struct lnet_process_id id = {0};
2092         struct libcfs_ioctl_data *data = arg;
2093         int rc;
2094
2095         switch(cmd) {
2096         case IOC_LIBCFS_GET_INTERFACE: {
2097                 ksock_net_t       *net = ni->ni_data;
2098                 ksock_interface_t *iface;
2099
2100                 read_lock(&ksocknal_data.ksnd_global_lock);
2101
2102                 if (data->ioc_count >= (__u32)net->ksnn_ninterfaces) {
2103                         rc = -ENOENT;
2104                 } else {
2105                         rc = 0;
2106                         iface = &net->ksnn_interfaces[data->ioc_count];
2107
2108                         data->ioc_u32[0] = iface->ksni_ipaddr;
2109                         data->ioc_u32[1] = iface->ksni_netmask;
2110                         data->ioc_u32[2] = iface->ksni_npeers;
2111                         data->ioc_u32[3] = iface->ksni_nroutes;
2112                 }
2113
2114                 read_unlock(&ksocknal_data.ksnd_global_lock);
2115                 return rc;
2116         }
2117
2118         case IOC_LIBCFS_ADD_INTERFACE:
2119                 return ksocknal_add_interface(ni,
2120                                               data->ioc_u32[0], /* IP address */
2121                                               data->ioc_u32[1]); /* net mask */
2122
2123         case IOC_LIBCFS_DEL_INTERFACE:
2124                 return ksocknal_del_interface(ni,
2125                                               data->ioc_u32[0]); /* IP address */
2126
2127         case IOC_LIBCFS_GET_PEER: {
2128                 __u32            myip = 0;
2129                 __u32            ip = 0;
2130                 int              port = 0;
2131                 int              conn_count = 0;
2132                 int              share_count = 0;
2133
2134                 rc = ksocknal_get_peer_info(ni, data->ioc_count,
2135                                             &id, &myip, &ip, &port,
2136                                             &conn_count,  &share_count);
2137                 if (rc != 0)
2138                         return rc;
2139
2140                 data->ioc_nid    = id.nid;
2141                 data->ioc_count  = share_count;
2142                 data->ioc_u32[0] = ip;
2143                 data->ioc_u32[1] = port;
2144                 data->ioc_u32[2] = myip;
2145                 data->ioc_u32[3] = conn_count;
2146                 data->ioc_u32[4] = id.pid;
2147                 return 0;
2148         }
2149
2150         case IOC_LIBCFS_ADD_PEER:
2151                 id.nid = data->ioc_nid;
2152                 id.pid = LNET_PID_LUSTRE;
2153                 return ksocknal_add_peer (ni, id,
2154                                           data->ioc_u32[0], /* IP */
2155                                           data->ioc_u32[1]); /* port */
2156
2157         case IOC_LIBCFS_DEL_PEER:
2158                 id.nid = data->ioc_nid;
2159                 id.pid = LNET_PID_ANY;
2160                 return ksocknal_del_peer (ni, id,
2161                                           data->ioc_u32[0]); /* IP */
2162
2163         case IOC_LIBCFS_GET_CONN: {
2164                 int           txmem;
2165                 int           rxmem;
2166                 int           nagle;
2167                 ksock_conn_t *conn = ksocknal_get_conn_by_idx (ni, data->ioc_count);
2168
2169                 if (conn == NULL)
2170                         return -ENOENT;
2171
2172                 ksocknal_lib_get_conn_tunables(conn, &txmem, &rxmem, &nagle);
2173
2174                 data->ioc_count  = txmem;
2175                 data->ioc_nid    = conn->ksnc_peer->ksnp_id.nid;
2176                 data->ioc_flags  = nagle;
2177                 data->ioc_u32[0] = conn->ksnc_ipaddr;
2178                 data->ioc_u32[1] = conn->ksnc_port;
2179                 data->ioc_u32[2] = conn->ksnc_myipaddr;
2180                 data->ioc_u32[3] = conn->ksnc_type;
2181                 data->ioc_u32[4] = conn->ksnc_scheduler->kss_info->ksi_cpt;
2182                 data->ioc_u32[5] = rxmem;
2183                 data->ioc_u32[6] = conn->ksnc_peer->ksnp_id.pid;
2184                 ksocknal_conn_decref(conn);
2185                 return 0;
2186         }
2187
2188         case IOC_LIBCFS_CLOSE_CONNECTION:
2189                 id.nid = data->ioc_nid;
2190                 id.pid = LNET_PID_ANY;
2191                 return ksocknal_close_matching_conns (id,
2192                                                       data->ioc_u32[0]);
2193
2194         case IOC_LIBCFS_REGISTER_MYNID:
2195                 /* Ignore if this is a noop */
2196                 if (data->ioc_nid == ni->ni_nid)
2197                         return 0;
2198
2199                 CERROR("obsolete IOC_LIBCFS_REGISTER_MYNID: %s(%s)\n",
2200                        libcfs_nid2str(data->ioc_nid),
2201                        libcfs_nid2str(ni->ni_nid));
2202                 return -EINVAL;
2203
2204         case IOC_LIBCFS_PUSH_CONNECTION:
2205                 id.nid = data->ioc_nid;
2206                 id.pid = LNET_PID_ANY;
2207                 return ksocknal_push(ni, id);
2208
2209         default:
2210                 return -EINVAL;
2211         }
2212         /* not reached */
2213 }
2214
2215 static void
2216 ksocknal_free_buffers (void)
2217 {
2218         LASSERT (atomic_read(&ksocknal_data.ksnd_nactive_txs) == 0);
2219
2220         if (ksocknal_data.ksnd_sched_info != NULL) {
2221                 struct ksock_sched_info *info;
2222                 int                     i;
2223
2224                 cfs_percpt_for_each(info, i, ksocknal_data.ksnd_sched_info) {
2225                         if (info->ksi_scheds != NULL) {
2226                                 LIBCFS_FREE(info->ksi_scheds,
2227                                             info->ksi_nthreads_max *
2228                                             sizeof(info->ksi_scheds[0]));
2229                         }
2230                 }
2231                 cfs_percpt_free(ksocknal_data.ksnd_sched_info);
2232         }
2233
2234         LIBCFS_FREE (ksocknal_data.ksnd_peers,
2235                      sizeof(struct list_head) *
2236                      ksocknal_data.ksnd_peer_hash_size);
2237
2238         spin_lock(&ksocknal_data.ksnd_tx_lock);
2239
2240         if (!list_empty(&ksocknal_data.ksnd_idle_noop_txs)) {
2241                 struct list_head        zlist;
2242                 ksock_tx_t      *tx;
2243
2244                 list_add(&zlist, &ksocknal_data.ksnd_idle_noop_txs);
2245                 list_del_init(&ksocknal_data.ksnd_idle_noop_txs);
2246                 spin_unlock(&ksocknal_data.ksnd_tx_lock);
2247
2248                 while (!list_empty(&zlist)) {
2249                         tx = list_entry(zlist.next, ksock_tx_t, tx_list);
2250                         list_del(&tx->tx_list);
2251                         LIBCFS_FREE(tx, tx->tx_desc_size);
2252                 }
2253         } else {
2254                 spin_unlock(&ksocknal_data.ksnd_tx_lock);
2255         }
2256 }
2257
2258 static void
2259 ksocknal_base_shutdown(void)
2260 {
2261         struct ksock_sched_info *info;
2262         ksock_sched_t           *sched;
2263         int                     i;
2264         int                     j;
2265
2266         CDEBUG(D_MALLOC, "before NAL cleanup: kmem %d\n",
2267                atomic_read (&libcfs_kmemory));
2268         LASSERT (ksocknal_data.ksnd_nnets == 0);
2269
2270         switch (ksocknal_data.ksnd_init) {
2271         default:
2272                 LASSERT (0);
2273
2274         case SOCKNAL_INIT_ALL:
2275         case SOCKNAL_INIT_DATA:
2276                 LASSERT (ksocknal_data.ksnd_peers != NULL);
2277                 for (i = 0; i < ksocknal_data.ksnd_peer_hash_size; i++) {
2278                         LASSERT(list_empty(&ksocknal_data.ksnd_peers[i]));
2279                 }
2280
2281                 LASSERT(list_empty(&ksocknal_data.ksnd_nets));
2282                 LASSERT(list_empty(&ksocknal_data.ksnd_enomem_conns));
2283                 LASSERT(list_empty(&ksocknal_data.ksnd_zombie_conns));
2284                 LASSERT(list_empty(&ksocknal_data.ksnd_connd_connreqs));
2285                 LASSERT(list_empty(&ksocknal_data.ksnd_connd_routes));
2286
2287                 if (ksocknal_data.ksnd_sched_info != NULL) {
2288                         cfs_percpt_for_each(info, i,
2289                                             ksocknal_data.ksnd_sched_info) {
2290                                 if (info->ksi_scheds == NULL)
2291                                         continue;
2292
2293                                 for (j = 0; j < info->ksi_nthreads_max; j++) {
2294
2295                                         sched = &info->ksi_scheds[j];
2296                                         LASSERT(list_empty(&sched->\
2297                                                                kss_tx_conns));
2298                                         LASSERT(list_empty(&sched->\
2299                                                                kss_rx_conns));
2300                                         LASSERT(list_empty(&sched-> \
2301                                                   kss_zombie_noop_txs));
2302                                         LASSERT(sched->kss_nconns == 0);
2303                                 }
2304                         }
2305                 }
2306
2307                 /* flag threads to terminate; wake and wait for them to die */
2308                 ksocknal_data.ksnd_shuttingdown = 1;
2309                 wake_up_all(&ksocknal_data.ksnd_connd_waitq);
2310                 wake_up_all(&ksocknal_data.ksnd_reaper_waitq);
2311
2312                 if (ksocknal_data.ksnd_sched_info != NULL) {
2313                         cfs_percpt_for_each(info, i,
2314                                             ksocknal_data.ksnd_sched_info) {
2315                                 if (info->ksi_scheds == NULL)
2316                                         continue;
2317
2318                                 for (j = 0; j < info->ksi_nthreads_max; j++) {
2319                                         sched = &info->ksi_scheds[j];
2320                                         wake_up_all(&sched->kss_waitq);
2321                                 }
2322                         }
2323                 }
2324
2325                 i = 4;
2326                 read_lock(&ksocknal_data.ksnd_global_lock);
2327                 while (ksocknal_data.ksnd_nthreads != 0) {
2328                         i++;
2329                         /* power of 2? */
2330                         CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET,
2331                                 "waiting for %d threads to terminate\n",
2332                                 ksocknal_data.ksnd_nthreads);
2333                         read_unlock(&ksocknal_data.ksnd_global_lock);
2334                         set_current_state(TASK_UNINTERRUPTIBLE);
2335                         schedule_timeout(cfs_time_seconds(1));
2336                         read_lock(&ksocknal_data.ksnd_global_lock);
2337                 }
2338                 read_unlock(&ksocknal_data.ksnd_global_lock);
2339
2340                 ksocknal_free_buffers();
2341
2342                 ksocknal_data.ksnd_init = SOCKNAL_INIT_NOTHING;
2343                 break;
2344         }
2345
2346         CDEBUG(D_MALLOC, "after NAL cleanup: kmem %d\n",
2347                atomic_read (&libcfs_kmemory));
2348
2349         module_put(THIS_MODULE);
2350 }
2351
2352 static __u64 ksocknal_new_incarnation(void)
2353 {
2354         struct timeval tv;
2355
2356         /* The incarnation number is the time this module loaded and it
2357          * identifies this particular instance of the socknal.  Hopefully
2358          * we won't be able to reboot more frequently than 1MHz for the
2359          * forseeable future :) */
2360
2361         do_gettimeofday(&tv);
2362
2363         return (((__u64)tv.tv_sec) * 1000000) + tv.tv_usec;
2364 }
2365
2366 static int
2367 ksocknal_base_startup(void)
2368 {
2369         struct ksock_sched_info *info;
2370         int                     rc;
2371         int                     i;
2372
2373         LASSERT (ksocknal_data.ksnd_init == SOCKNAL_INIT_NOTHING);
2374         LASSERT (ksocknal_data.ksnd_nnets == 0);
2375
2376         memset (&ksocknal_data, 0, sizeof (ksocknal_data)); /* zero pointers */
2377
2378         ksocknal_data.ksnd_peer_hash_size = SOCKNAL_PEER_HASH_SIZE;
2379         LIBCFS_ALLOC(ksocknal_data.ksnd_peers,
2380                      sizeof(struct list_head) *
2381                      ksocknal_data.ksnd_peer_hash_size);
2382         if (ksocknal_data.ksnd_peers == NULL)
2383                 return -ENOMEM;
2384
2385         for (i = 0; i < ksocknal_data.ksnd_peer_hash_size; i++)
2386                 INIT_LIST_HEAD(&ksocknal_data.ksnd_peers[i]);
2387
2388         rwlock_init(&ksocknal_data.ksnd_global_lock);
2389         INIT_LIST_HEAD(&ksocknal_data.ksnd_nets);
2390
2391         spin_lock_init(&ksocknal_data.ksnd_reaper_lock);
2392         INIT_LIST_HEAD(&ksocknal_data.ksnd_enomem_conns);
2393         INIT_LIST_HEAD(&ksocknal_data.ksnd_zombie_conns);
2394         INIT_LIST_HEAD(&ksocknal_data.ksnd_deathrow_conns);
2395         init_waitqueue_head(&ksocknal_data.ksnd_reaper_waitq);
2396
2397         spin_lock_init(&ksocknal_data.ksnd_connd_lock);
2398         INIT_LIST_HEAD(&ksocknal_data.ksnd_connd_connreqs);
2399         INIT_LIST_HEAD(&ksocknal_data.ksnd_connd_routes);
2400         init_waitqueue_head(&ksocknal_data.ksnd_connd_waitq);
2401
2402         spin_lock_init(&ksocknal_data.ksnd_tx_lock);
2403         INIT_LIST_HEAD(&ksocknal_data.ksnd_idle_noop_txs);
2404
2405         /* NB memset above zeros whole of ksocknal_data */
2406
2407         /* flag lists/ptrs/locks initialised */
2408         ksocknal_data.ksnd_init = SOCKNAL_INIT_DATA;
2409         try_module_get(THIS_MODULE);
2410
2411         ksocknal_data.ksnd_sched_info = cfs_percpt_alloc(lnet_cpt_table(),
2412                                                          sizeof(*info));
2413         if (ksocknal_data.ksnd_sched_info == NULL)
2414                 goto failed;
2415
2416         cfs_percpt_for_each(info, i, ksocknal_data.ksnd_sched_info) {
2417                 ksock_sched_t   *sched;
2418                 int             nthrs;
2419
2420                 nthrs = cfs_cpt_weight(lnet_cpt_table(), i);
2421                 if (*ksocknal_tunables.ksnd_nscheds > 0) {
2422                         nthrs = min(nthrs, *ksocknal_tunables.ksnd_nscheds);
2423                 } else {
2424                         /* max to half of CPUs, assume another half should be
2425                          * reserved for upper layer modules */
2426                         nthrs = min(max(SOCKNAL_NSCHEDS, nthrs >> 1), nthrs);
2427                 }
2428
2429                 info->ksi_nthreads_max = nthrs;
2430                 info->ksi_cpt = i;
2431
2432                 LIBCFS_CPT_ALLOC(info->ksi_scheds, lnet_cpt_table(), i,
2433                                  info->ksi_nthreads_max * sizeof(*sched));
2434                 if (info->ksi_scheds == NULL)
2435                         goto failed;
2436
2437                 for (; nthrs > 0; nthrs--) {
2438                         sched = &info->ksi_scheds[nthrs - 1];
2439
2440                         sched->kss_info = info;
2441                         spin_lock_init(&sched->kss_lock);
2442                         INIT_LIST_HEAD(&sched->kss_rx_conns);
2443                         INIT_LIST_HEAD(&sched->kss_tx_conns);
2444                         INIT_LIST_HEAD(&sched->kss_zombie_noop_txs);
2445                         init_waitqueue_head(&sched->kss_waitq);
2446                 }
2447         }
2448
2449         ksocknal_data.ksnd_connd_starting         = 0;
2450         ksocknal_data.ksnd_connd_failed_stamp     = 0;
2451         ksocknal_data.ksnd_connd_starting_stamp   = ktime_get_real_seconds();
2452         /* must have at least 2 connds to remain responsive to accepts while
2453          * connecting */
2454         if (*ksocknal_tunables.ksnd_nconnds < SOCKNAL_CONND_RESV + 1)
2455                 *ksocknal_tunables.ksnd_nconnds = SOCKNAL_CONND_RESV + 1;
2456
2457         if (*ksocknal_tunables.ksnd_nconnds_max <
2458             *ksocknal_tunables.ksnd_nconnds) {
2459                 ksocknal_tunables.ksnd_nconnds_max =
2460                         ksocknal_tunables.ksnd_nconnds;
2461         }
2462
2463         for (i = 0; i < *ksocknal_tunables.ksnd_nconnds; i++) {
2464                 char name[16];
2465                 spin_lock_bh(&ksocknal_data.ksnd_connd_lock);
2466                 ksocknal_data.ksnd_connd_starting++;
2467                 spin_unlock_bh(&ksocknal_data.ksnd_connd_lock);
2468
2469
2470                 snprintf(name, sizeof(name), "socknal_cd%02d", i);
2471                 rc = ksocknal_thread_start(ksocknal_connd,
2472                                            (void *)((uintptr_t)i), name);
2473                 if (rc != 0) {
2474                         spin_lock_bh(&ksocknal_data.ksnd_connd_lock);
2475                         ksocknal_data.ksnd_connd_starting--;
2476                         spin_unlock_bh(&ksocknal_data.ksnd_connd_lock);
2477                         CERROR("Can't spawn socknal connd: %d\n", rc);
2478                         goto failed;
2479                 }
2480         }
2481
2482         rc = ksocknal_thread_start(ksocknal_reaper, NULL, "socknal_reaper");
2483         if (rc != 0) {
2484                 CERROR ("Can't spawn socknal reaper: %d\n", rc);
2485                 goto failed;
2486         }
2487
2488         /* flag everything initialised */
2489         ksocknal_data.ksnd_init = SOCKNAL_INIT_ALL;
2490
2491         return 0;
2492
2493  failed:
2494         ksocknal_base_shutdown();
2495         return -ENETDOWN;
2496 }
2497
2498 static void
2499 ksocknal_debug_peerhash(struct lnet_ni *ni)
2500 {
2501         ksock_peer_ni_t *peer_ni = NULL;
2502         struct list_head        *tmp;
2503         int             i;
2504
2505         read_lock(&ksocknal_data.ksnd_global_lock);
2506
2507         for (i = 0; i < ksocknal_data.ksnd_peer_hash_size; i++) {
2508                 list_for_each(tmp, &ksocknal_data.ksnd_peers[i]) {
2509                         peer_ni = list_entry(tmp, ksock_peer_ni_t, ksnp_list);
2510
2511                         if (peer_ni->ksnp_ni == ni) break;
2512
2513                         peer_ni = NULL;
2514                 }
2515         }
2516
2517         if (peer_ni != NULL) {
2518                 ksock_route_t *route;
2519                 ksock_conn_t  *conn;
2520
2521                 CWARN ("Active peer_ni on shutdown: %s, ref %d, scnt %d, "
2522                        "closing %d, accepting %d, err %d, zcookie %llu, "
2523                        "txq %d, zc_req %d\n", libcfs_id2str(peer_ni->ksnp_id),
2524                        atomic_read(&peer_ni->ksnp_refcount),
2525                        peer_ni->ksnp_sharecount, peer_ni->ksnp_closing,
2526                        peer_ni->ksnp_accepting, peer_ni->ksnp_error,
2527                        peer_ni->ksnp_zc_next_cookie,
2528                        !list_empty(&peer_ni->ksnp_tx_queue),
2529                        !list_empty(&peer_ni->ksnp_zc_req_list));
2530
2531                 list_for_each(tmp, &peer_ni->ksnp_routes) {
2532                         route = list_entry(tmp, ksock_route_t, ksnr_list);
2533                         CWARN ("Route: ref %d, schd %d, conn %d, cnted %d, "
2534                                "del %d\n", atomic_read(&route->ksnr_refcount),
2535                                route->ksnr_scheduled, route->ksnr_connecting,
2536                                route->ksnr_connected, route->ksnr_deleted);
2537                 }
2538
2539                 list_for_each(tmp, &peer_ni->ksnp_conns) {
2540                         conn = list_entry(tmp, ksock_conn_t, ksnc_list);
2541                         CWARN ("Conn: ref %d, sref %d, t %d, c %d\n",
2542                                atomic_read(&conn->ksnc_conn_refcount),
2543                                atomic_read(&conn->ksnc_sock_refcount),
2544                                conn->ksnc_type, conn->ksnc_closing);
2545                 }
2546         }
2547
2548         read_unlock(&ksocknal_data.ksnd_global_lock);
2549         return;
2550 }
2551
2552 void
2553 ksocknal_shutdown(struct lnet_ni *ni)
2554 {
2555         ksock_net_t *net = ni->ni_data;
2556         struct lnet_process_id anyid = {
2557                 .nid = LNET_NID_ANY,
2558                 .pid = LNET_PID_ANY,
2559         };
2560         int i;
2561
2562         LASSERT(ksocknal_data.ksnd_init == SOCKNAL_INIT_ALL);
2563         LASSERT(ksocknal_data.ksnd_nnets > 0);
2564
2565         spin_lock_bh(&net->ksnn_lock);
2566         net->ksnn_shutdown = 1;                 /* prevent new peers */
2567         spin_unlock_bh(&net->ksnn_lock);
2568
2569         /* Delete all peers */
2570         ksocknal_del_peer(ni, anyid, 0);
2571
2572         /* Wait for all peer_ni state to clean up */
2573         i = 2;
2574         spin_lock_bh(&net->ksnn_lock);
2575         while (net->ksnn_npeers != 0) {
2576                 spin_unlock_bh(&net->ksnn_lock);
2577
2578                 i++;
2579                 CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET, /* power of 2? */
2580                        "waiting for %d peers to disconnect\n",
2581                        net->ksnn_npeers);
2582                 set_current_state(TASK_UNINTERRUPTIBLE);
2583                 schedule_timeout(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         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 static 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 = lnet_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 = lnet_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                 strlcpy(net->ksnn_interfaces[j].ksni_name,
2649                         names[i], sizeof(net->ksnn_interfaces[j].ksni_name));
2650                 j++;
2651         }
2652
2653         lnet_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 static 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                 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 static 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                 char            name[20];
2729                 ksock_sched_t   *sched;
2730                 id = KSOCK_THREAD_ID(info->ksi_cpt, info->ksi_nthreads + i);
2731                 sched = &info->ksi_scheds[KSOCK_THREAD_SID(id)];
2732                 snprintf(name, sizeof(name), "socknal_sd%02d_%02d",
2733                          info->ksi_cpt, (int)(sched - &info->ksi_scheds[0]));
2734
2735                 rc = ksocknal_thread_start(ksocknal_scheduler,
2736                                            (void *)id, name);
2737                 if (rc == 0)
2738                         continue;
2739
2740                 CERROR("Can't spawn thread %d for scheduler[%d]: %d\n",
2741                        info->ksi_cpt, info->ksi_nthreads + i, rc);
2742                 break;
2743         }
2744
2745         info->ksi_nthreads += i;
2746         return rc;
2747 }
2748
2749 static int
2750 ksocknal_net_start_threads(ksock_net_t *net, __u32 *cpts, int ncpts)
2751 {
2752         int     newif = ksocknal_search_new_ipif(net);
2753         int     rc;
2754         int     i;
2755
2756         if (ncpts > 0 && ncpts > cfs_cpt_number(lnet_cpt_table()))
2757                 return -EINVAL;
2758
2759         for (i = 0; i < ncpts; i++) {
2760                 struct ksock_sched_info *info;
2761                 int cpt = (cpts == NULL) ? i : cpts[i];
2762
2763                 LASSERT(cpt < cfs_cpt_number(lnet_cpt_table()));
2764                 info = ksocknal_data.ksnd_sched_info[cpt];
2765
2766                 if (!newif && info->ksi_nthreads > 0)
2767                         continue;
2768
2769                 rc = ksocknal_start_schedulers(info);
2770                 if (rc != 0)
2771                         return rc;
2772         }
2773         return 0;
2774 }
2775
2776 int
2777 ksocknal_startup(struct lnet_ni *ni)
2778 {
2779         ksock_net_t  *net;
2780         int           rc;
2781         int           i;
2782         struct net_device *net_dev;
2783         int node_id;
2784
2785         LASSERT (ni->ni_net->net_lnd == &the_ksocklnd);
2786
2787         if (ksocknal_data.ksnd_init == SOCKNAL_INIT_NOTHING) {
2788                 rc = ksocknal_base_startup();
2789                 if (rc != 0)
2790                         return rc;
2791         }
2792
2793         LIBCFS_ALLOC(net, sizeof(*net));
2794         if (net == NULL)
2795                 goto fail_0;
2796
2797         spin_lock_init(&net->ksnn_lock);
2798         net->ksnn_incarnation = ksocknal_new_incarnation();
2799         ni->ni_data = net;
2800         if (!ni->ni_net->net_tunables_set) {
2801                 ni->ni_net->net_tunables.lct_peer_timeout =
2802                         *ksocknal_tunables.ksnd_peertimeout;
2803                 ni->ni_net->net_tunables.lct_max_tx_credits =
2804                         *ksocknal_tunables.ksnd_credits;
2805                 ni->ni_net->net_tunables.lct_peer_tx_credits =
2806                         *ksocknal_tunables.ksnd_peertxcredits;
2807                 ni->ni_net->net_tunables.lct_peer_rtr_credits =
2808                         *ksocknal_tunables.ksnd_peerrtrcredits;
2809                 ni->ni_net->net_tunables_set = true;
2810         }
2811
2812
2813         if (ni->ni_interfaces[0] == NULL) {
2814                 rc = ksocknal_enumerate_interfaces(net);
2815                 if (rc <= 0)
2816                         goto fail_1;
2817
2818                 net->ksnn_ninterfaces = 1;
2819         } else {
2820                 for (i = 0; i < LNET_MAX_INTERFACES; i++) {
2821                         int    up;
2822
2823                         if (ni->ni_interfaces[i] == NULL)
2824                                 break;
2825
2826                         rc = lnet_ipif_query(ni->ni_interfaces[i], &up,
2827                                 &net->ksnn_interfaces[i].ksni_ipaddr,
2828                                 &net->ksnn_interfaces[i].ksni_netmask);
2829
2830                         if (rc != 0) {
2831                                 CERROR("Can't get interface %s info: %d\n",
2832                                        ni->ni_interfaces[i], rc);
2833                                 goto fail_1;
2834                         }
2835
2836                         if (!up) {
2837                                 CERROR("Interface %s is down\n",
2838                                        ni->ni_interfaces[i]);
2839                                 goto fail_1;
2840                         }
2841
2842                         strlcpy(net->ksnn_interfaces[i].ksni_name,
2843                                 ni->ni_interfaces[i],
2844                                 sizeof(net->ksnn_interfaces[i].ksni_name));
2845
2846                 }
2847                 net->ksnn_ninterfaces = i;
2848         }
2849
2850         net_dev = dev_get_by_name(&init_net,
2851                                   net->ksnn_interfaces[0].ksni_name);
2852         if (net_dev != NULL) {
2853                 node_id = dev_to_node(&net_dev->dev);
2854                 ni->ni_dev_cpt = cfs_cpt_of_node(lnet_cpt_table(), node_id);
2855                 dev_put(net_dev);
2856         } else {
2857                 ni->ni_dev_cpt = CFS_CPT_ANY;
2858         }
2859
2860         /* call it before add it to ksocknal_data.ksnd_nets */
2861         rc = ksocknal_net_start_threads(net, ni->ni_cpts, ni->ni_ncpts);
2862         if (rc != 0)
2863                 goto fail_1;
2864
2865         ni->ni_nid = LNET_MKNID(LNET_NIDNET(ni->ni_nid),
2866                                 net->ksnn_interfaces[0].ksni_ipaddr);
2867         list_add(&net->ksnn_list, &ksocknal_data.ksnd_nets);
2868
2869         ksocknal_data.ksnd_nnets++;
2870
2871         return 0;
2872
2873  fail_1:
2874         LIBCFS_FREE(net, sizeof(*net));
2875  fail_0:
2876         if (ksocknal_data.ksnd_nnets == 0)
2877                 ksocknal_base_shutdown();
2878
2879         return -ENETDOWN;
2880 }
2881
2882
2883 static void __exit ksocklnd_exit(void)
2884 {
2885         lnet_unregister_lnd(&the_ksocklnd);
2886 }
2887
2888 static int __init ksocklnd_init(void)
2889 {
2890         int rc;
2891
2892         /* check ksnr_connected/connecting field large enough */
2893         CLASSERT(SOCKLND_CONN_NTYPES <= 4);
2894         CLASSERT(SOCKLND_CONN_ACK == SOCKLND_CONN_BULK_IN);
2895
2896         /* initialize the_ksocklnd */
2897         the_ksocklnd.lnd_type     = SOCKLND;
2898         the_ksocklnd.lnd_startup  = ksocknal_startup;
2899         the_ksocklnd.lnd_shutdown = ksocknal_shutdown;
2900         the_ksocklnd.lnd_ctl      = ksocknal_ctl;
2901         the_ksocklnd.lnd_send     = ksocknal_send;
2902         the_ksocklnd.lnd_recv     = ksocknal_recv;
2903         the_ksocklnd.lnd_notify   = ksocknal_notify;
2904         the_ksocklnd.lnd_query    = ksocknal_query;
2905         the_ksocklnd.lnd_accept   = ksocknal_accept;
2906
2907         rc = ksocknal_tunables_init();
2908         if (rc != 0)
2909                 return rc;
2910
2911         lnet_register_lnd(&the_ksocklnd);
2912
2913         return 0;
2914 }
2915
2916 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
2917 MODULE_DESCRIPTION("TCP Socket LNet Network Driver");
2918 MODULE_VERSION("2.8.0");
2919 MODULE_LICENSE("GPL");
2920
2921 module_init(ksocklnd_init);
2922 module_exit(ksocklnd_exit);