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, 2017, 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/inetdevice.h>
  41 #include "socklnd.h"
  42 #include <linux/sunrpc/addr.h>
  43
  44 static const struct lnet_lnd the_ksocklnd;
  45 struct ksock_nal_data ksocknal_data;
  46
  47 static struct ksock_interface *
  48 ksocknal_ip2iface(struct lnet_ni *ni, struct sockaddr *addr)
  49 {
  50         struct ksock_net *net = ni->ni_data;
  51         int i;
  52         struct ksock_interface *iface;
  53
  54         for (i = 0; i < net->ksnn_ninterfaces; i++) {
  55                 LASSERT(i < LNET_INTERFACES_NUM);
  56                 iface = &net->ksnn_interfaces[i];
  57
  58                 if (rpc_cmp_addr((struct sockaddr *)&iface->ksni_addr, addr))
  59                         return iface;
  60         }
  61
  62         return NULL;
  63 }
  64
  65 static struct ksock_interface *
  66 ksocknal_index2iface(struct lnet_ni *ni, int index)
  67 {
  68         struct ksock_net *net = ni->ni_data;
  69         int i;
  70         struct ksock_interface *iface;
  71
  72         for (i = 0; i < net->ksnn_ninterfaces; i++) {
  73                 LASSERT(i < LNET_INTERFACES_NUM);
  74                 iface = &net->ksnn_interfaces[i];
  75
  76                 if (iface->ksni_index == index)
  77                         return iface;
  78         }
  79
  80         return NULL;
  81 }
  82
  83 static int ksocknal_ip2index(struct sockaddr *addr, struct lnet_ni *ni)
  84 {
  85         struct net_device *dev;
  86         int ret = -1;
  87         DECLARE_CONST_IN_IFADDR(ifa);
  88
  89         if (addr->sa_family != AF_INET)
  90                 /* No IPv6 support yet */
  91                 return ret;
  92
  93         rcu_read_lock();
  94         for_each_netdev(ni->ni_net_ns, dev) {
  95                 int flags = dev_get_flags(dev);
  96                 struct in_device *in_dev;
  97
  98                 if (flags & IFF_LOOPBACK) /* skip the loopback IF */
  99                         continue;
 100
 101                 if (!(flags & IFF_UP))
 102                         continue;
 103
 104                 in_dev = __in_dev_get_rcu(dev);
 105                 if (!in_dev)
 106                         continue;
 107
 108                 in_dev_for_each_ifa_rcu(ifa, in_dev) {
 109                         if (ifa->ifa_local ==
 110                             ((struct sockaddr_in *)addr)->sin_addr.s_addr)
 111                                 ret = dev->ifindex;
 112                 }
 113                 endfor_ifa(in_dev);
 114                 if (ret >= 0)
 115                         break;
 116         }
 117         rcu_read_unlock();
 118
 119         return ret;
 120 }
 121
 122 static struct ksock_route *
 123 ksocknal_create_route(struct sockaddr *addr)
 124 {
 125         struct ksock_route *route;
 126
 127         LIBCFS_ALLOC (route, sizeof (*route));
 128         if (route == NULL)
 129                 return (NULL);
 130
 131         refcount_set(&route->ksnr_refcount, 1);
 132         route->ksnr_peer = NULL;
 133         route->ksnr_retry_interval = 0;         /* OK to connect at any time */
 134         rpc_copy_addr((struct sockaddr *)&route->ksnr_addr, addr);
 135         rpc_set_port((struct sockaddr *)&route->ksnr_addr, rpc_get_port(addr));
 136         route->ksnr_myiface = -1;
 137         route->ksnr_scheduled = 0;
 138         route->ksnr_connecting = 0;
 139         route->ksnr_connected = 0;
 140         route->ksnr_deleted = 0;
 141         route->ksnr_conn_count = 0;
 142         route->ksnr_share_count = 0;
 143
 144         return route;
 145 }
 146
 147 void
 148 ksocknal_destroy_route(struct ksock_route *route)
 149 {
 150         LASSERT(refcount_read(&route->ksnr_refcount) == 0);
 151
 152         if (route->ksnr_peer != NULL)
 153                 ksocknal_peer_decref(route->ksnr_peer);
 154
 155         LIBCFS_FREE (route, sizeof (*route));
 156 }
 157
 158 static struct ksock_peer_ni *
 159 ksocknal_create_peer(struct lnet_ni *ni, struct lnet_process_id id)
 160 {
 161         int cpt = lnet_cpt_of_nid(id.nid, ni);
 162         struct ksock_net *net = ni->ni_data;
 163         struct ksock_peer_ni *peer_ni;
 164
 165         LASSERT(id.nid != LNET_NID_ANY);
 166         LASSERT(id.pid != LNET_PID_ANY);
 167         LASSERT(!in_interrupt());
 168
 169         if (!atomic_inc_unless_negative(&net->ksnn_npeers)) {
 170                 CERROR("Can't create peer_ni: network shutdown\n");
 171                 return ERR_PTR(-ESHUTDOWN);
 172         }
 173
 174         LIBCFS_CPT_ALLOC(peer_ni, lnet_cpt_table(), cpt, sizeof(*peer_ni));
 175         if (!peer_ni) {
 176                 atomic_dec(&net->ksnn_npeers);
 177                 return ERR_PTR(-ENOMEM);
 178         }
 179
 180         peer_ni->ksnp_ni = ni;
 181         peer_ni->ksnp_id = id;
 182         refcount_set(&peer_ni->ksnp_refcount, 1); /* 1 ref for caller */
 183         peer_ni->ksnp_closing = 0;
 184         peer_ni->ksnp_accepting = 0;
 185         peer_ni->ksnp_proto = NULL;
 186         peer_ni->ksnp_last_alive = 0;
 187         peer_ni->ksnp_zc_next_cookie = SOCKNAL_KEEPALIVE_PING + 1;
 188
 189         INIT_LIST_HEAD(&peer_ni->ksnp_conns);
 190         INIT_LIST_HEAD(&peer_ni->ksnp_routes);
 191         INIT_LIST_HEAD(&peer_ni->ksnp_tx_queue);
 192         INIT_LIST_HEAD(&peer_ni->ksnp_zc_req_list);
 193         spin_lock_init(&peer_ni->ksnp_lock);
 194
 195         return peer_ni;
 196 }
 197
 198 void
 199 ksocknal_destroy_peer(struct ksock_peer_ni *peer_ni)
 200 {
 201         struct ksock_net *net = peer_ni->ksnp_ni->ni_data;
 202
 203         CDEBUG (D_NET, "peer_ni %s %p deleted\n",
 204                 libcfs_id2str(peer_ni->ksnp_id), peer_ni);
 205
 206         LASSERT(refcount_read(&peer_ni->ksnp_refcount) == 0);
 207         LASSERT(peer_ni->ksnp_accepting == 0);
 208         LASSERT(list_empty(&peer_ni->ksnp_conns));
 209         LASSERT(list_empty(&peer_ni->ksnp_routes));
 210         LASSERT(list_empty(&peer_ni->ksnp_tx_queue));
 211         LASSERT(list_empty(&peer_ni->ksnp_zc_req_list));
 212
 213         LIBCFS_FREE(peer_ni, sizeof(*peer_ni));
 214
 215         /* NB a peer_ni's connections and routes keep a reference on their
 216          * peer_ni until they are destroyed, so we can be assured that _all_
 217          * state to do with this peer_ni has been cleaned up when its refcount
 218          * drops to zero.
 219          */
 220         if (atomic_dec_and_test(&net->ksnn_npeers))
 221                 wake_up_var(&net->ksnn_npeers);
 222 }
 223
 224 struct ksock_peer_ni *
 225 ksocknal_find_peer_locked(struct lnet_ni *ni, struct lnet_process_id id)
 226 {
 227         struct ksock_peer_ni *peer_ni;
 228
 229         hash_for_each_possible(ksocknal_data.ksnd_peers, peer_ni,
 230                                ksnp_list, id.nid) {
 231                 LASSERT(!peer_ni->ksnp_closing);
 232
 233                 if (peer_ni->ksnp_ni != ni)
 234                         continue;
 235
 236                 if (peer_ni->ksnp_id.nid != id.nid ||
 237                     peer_ni->ksnp_id.pid != id.pid)
 238                         continue;
 239
 240                 CDEBUG(D_NET, "got peer_ni [%p] -> %s (%d)\n",
 241                        peer_ni, libcfs_id2str(id),
 242                        refcount_read(&peer_ni->ksnp_refcount));
 243                 return peer_ni;
 244         }
 245         return NULL;
 246 }
 247
 248 struct ksock_peer_ni *
 249 ksocknal_find_peer(struct lnet_ni *ni, struct lnet_process_id id)
 250 {
 251         struct ksock_peer_ni *peer_ni;
 252
 253         read_lock(&ksocknal_data.ksnd_global_lock);
 254         peer_ni = ksocknal_find_peer_locked(ni, id);
 255         if (peer_ni != NULL)                    /* +1 ref for caller? */
 256                 ksocknal_peer_addref(peer_ni);
 257         read_unlock(&ksocknal_data.ksnd_global_lock);
 258
 259         return (peer_ni);
 260 }
 261
 262 static void
 263 ksocknal_unlink_peer_locked(struct ksock_peer_ni *peer_ni)
 264 {
 265         int i;
 266         struct ksock_interface *iface;
 267
 268         for (i = 0; i < peer_ni->ksnp_n_passive_ips; i++) {
 269                 struct sockaddr_in sa = { .sin_family = AF_INET };
 270                 LASSERT(i < LNET_INTERFACES_NUM);
 271                 sa.sin_addr.s_addr = htonl(peer_ni->ksnp_passive_ips[i]);
 272
 273                 iface = ksocknal_ip2iface(peer_ni->ksnp_ni,
 274                                           (struct sockaddr *)&sa);
 275                 /*
 276                  * All IPs in peer_ni->ksnp_passive_ips[] come from the
 277                  * interface list, therefore the call must succeed.
 278                  */
 279                 LASSERT(iface != NULL);
 280
 281                 CDEBUG(D_NET, "peer_ni=%p iface=%p ksni_nroutes=%d\n",
 282                        peer_ni, iface, iface->ksni_nroutes);
 283                 iface->ksni_npeers--;
 284         }
 285
 286         LASSERT(list_empty(&peer_ni->ksnp_conns));
 287         LASSERT(list_empty(&peer_ni->ksnp_routes));
 288         LASSERT(!peer_ni->ksnp_closing);
 289         peer_ni->ksnp_closing = 1;
 290         hlist_del(&peer_ni->ksnp_list);
 291         /* lose peerlist's ref */
 292         ksocknal_peer_decref(peer_ni);
 293 }
 294
 295 static int
 296 ksocknal_get_peer_info(struct lnet_ni *ni, int index,
 297                        struct lnet_process_id *id, __u32 *myip, __u32 *peer_ip,
 298                        int *port, int *conn_count, int *share_count)
 299 {
 300         struct ksock_peer_ni *peer_ni;
 301         struct ksock_route *route;
 302         struct list_head *rtmp;
 303         int i;
 304         int j;
 305         int rc = -ENOENT;
 306
 307         read_lock(&ksocknal_data.ksnd_global_lock);
 308
 309         hash_for_each(ksocknal_data.ksnd_peers, i, peer_ni, ksnp_list) {
 310
 311                 if (peer_ni->ksnp_ni != ni)
 312                         continue;
 313
 314                 if (peer_ni->ksnp_n_passive_ips == 0 &&
 315                     list_empty(&peer_ni->ksnp_routes)) {
 316                         if (index-- > 0)
 317                                 continue;
 318
 319                         *id = peer_ni->ksnp_id;
 320                         *myip = 0;
 321                         *peer_ip = 0;
 322                         *port = 0;
 323                         *conn_count = 0;
 324                         *share_count = 0;
 325                         rc = 0;
 326                         goto out;
 327                 }
 328
 329                 for (j = 0; j < peer_ni->ksnp_n_passive_ips; j++) {
 330                         if (index-- > 0)
 331                                 continue;
 332
 333                         *id = peer_ni->ksnp_id;
 334                         *myip = peer_ni->ksnp_passive_ips[j];
 335                         *peer_ip = 0;
 336                         *port = 0;
 337                         *conn_count = 0;
 338                         *share_count = 0;
 339                         rc = 0;
 340                         goto out;
 341                 }
 342
 343                 list_for_each(rtmp, &peer_ni->ksnp_routes) {
 344                         if (index-- > 0)
 345                                 continue;
 346
 347                         route = list_entry(rtmp, struct ksock_route,
 348                                            ksnr_list);
 349
 350                         *id = peer_ni->ksnp_id;
 351                         if (route->ksnr_addr.ss_family == AF_INET) {
 352                                 struct sockaddr_in *sa =
 353                                         (void *)&route->ksnr_addr;
 354                                 rc = choose_ipv4_src(
 355                                         myip,
 356                                         route->ksnr_myiface,
 357                                         ntohl(sa->sin_addr.s_addr),
 358                                         ni->ni_net_ns);
 359                                 *peer_ip = ntohl(sa->sin_addr.s_addr);
 360                                 *port = ntohs(sa->sin_port);
 361                         } else {
 362                                 *myip = 0xFFFFFFFF;
 363                                 *peer_ip = 0xFFFFFFFF;
 364                                 *port = 0;
 365                                 rc = -ENOTSUPP;
 366                         }
 367                         *conn_count = route->ksnr_conn_count;
 368                         *share_count = route->ksnr_share_count;
 369                         goto out;
 370                 }
 371         }
 372 out:
 373         read_unlock(&ksocknal_data.ksnd_global_lock);
 374         return rc;
 375 }
 376
 377 static void
 378 ksocknal_associate_route_conn_locked(struct ksock_route *route,
 379                                      struct ksock_conn *conn)
 380 {
 381         struct ksock_peer_ni *peer_ni = route->ksnr_peer;
 382         int type = conn->ksnc_type;
 383         struct ksock_interface *iface;
 384         int conn_iface =
 385                 ksocknal_ip2index((struct sockaddr *)&conn->ksnc_myaddr,
 386                                   route->ksnr_peer->ksnp_ni);
 387
 388         conn->ksnc_route = route;
 389         ksocknal_route_addref(route);
 390
 391         if (route->ksnr_myiface != conn_iface) {
 392                 if (route->ksnr_myiface < 0) {
 393                         /* route wasn't bound locally yet (the initial route) */
 394                         CDEBUG(D_NET, "Binding %s %pIS to interface %d\n",
 395                                libcfs_id2str(peer_ni->ksnp_id),
 396                                &route->ksnr_addr,
 397                                conn_iface);
 398                 } else {
 399                         CDEBUG(D_NET,
 400                                "Rebinding %s %pIS from interface %d to %d\n",
 401                                libcfs_id2str(peer_ni->ksnp_id),
 402                                &route->ksnr_addr,
 403                                route->ksnr_myiface,
 404                                conn_iface);
 405
 406                         iface = ksocknal_index2iface(route->ksnr_peer->ksnp_ni,
 407                                                      route->ksnr_myiface);
 408                         if (iface)
 409                                 iface->ksni_nroutes--;
 410                 }
 411                 route->ksnr_myiface = conn_iface;
 412                 iface = ksocknal_index2iface(route->ksnr_peer->ksnp_ni,
 413                                              route->ksnr_myiface);
 414                 if (iface)
 415                         iface->ksni_nroutes++;
 416         }
 417
 418         route->ksnr_connected |= (1<<type);
 419         route->ksnr_conn_count++;
 420
 421         /* Successful connection => further attempts can
 422          * proceed immediately
 423          */
 424         route->ksnr_retry_interval = 0;
 425 }
 426
 427 static void
 428 ksocknal_add_route_locked(struct ksock_peer_ni *peer_ni, struct ksock_route *route)
 429 {
 430         struct list_head *tmp;
 431         struct ksock_conn *conn;
 432         struct ksock_route *route2;
 433         struct ksock_net *net = peer_ni->ksnp_ni->ni_data;
 434
 435         LASSERT(!peer_ni->ksnp_closing);
 436         LASSERT(route->ksnr_peer == NULL);
 437         LASSERT(!route->ksnr_scheduled);
 438         LASSERT(!route->ksnr_connecting);
 439         LASSERT(route->ksnr_connected == 0);
 440         LASSERT(net->ksnn_ninterfaces > 0);
 441
 442         /* LASSERT(unique) */
 443         list_for_each(tmp, &peer_ni->ksnp_routes) {
 444                 route2 = list_entry(tmp, struct ksock_route, ksnr_list);
 445
 446                 if (rpc_cmp_addr((struct sockaddr *)&route2->ksnr_addr,
 447                                  (struct sockaddr *)&route->ksnr_addr)) {
 448                         CERROR("Duplicate route %s %pI4h\n",
 449                                libcfs_id2str(peer_ni->ksnp_id),
 450                                &route->ksnr_addr);
 451                         LBUG();
 452                 }
 453         }
 454
 455         route->ksnr_peer = peer_ni;
 456         ksocknal_peer_addref(peer_ni);
 457
 458         /* set the route's interface to the current net's interface */
 459         route->ksnr_myiface = net->ksnn_interfaces[0].ksni_index;
 460         net->ksnn_interfaces[0].ksni_nroutes++;
 461
 462         /* peer_ni's routelist takes over my ref on 'route' */
 463         list_add_tail(&route->ksnr_list, &peer_ni->ksnp_routes);
 464
 465         list_for_each(tmp, &peer_ni->ksnp_conns) {
 466                 conn = list_entry(tmp, struct ksock_conn, ksnc_list);
 467
 468                 if (!rpc_cmp_addr((struct sockaddr *)&conn->ksnc_peeraddr,
 469                                   (struct sockaddr *)&route->ksnr_addr))
 470                         continue;
 471
 472                 ksocknal_associate_route_conn_locked(route, conn);
 473                 /* keep going (typed routes) */
 474         }
 475 }
 476
 477 static void
 478 ksocknal_del_route_locked(struct ksock_route *route)
 479 {
 480         struct ksock_peer_ni *peer_ni = route->ksnr_peer;
 481         struct ksock_interface *iface;
 482         struct ksock_conn *conn;
 483         struct ksock_conn *cnxt;
 484
 485         LASSERT(!route->ksnr_deleted);
 486
 487         /* Close associated conns */
 488         list_for_each_entry_safe(conn, cnxt, &peer_ni->ksnp_conns, ksnc_list) {
 489                 if (conn->ksnc_route != route)
 490                         continue;
 491
 492                 ksocknal_close_conn_locked(conn, 0);
 493         }
 494
 495         if (route->ksnr_myiface >= 0) {
 496                 iface = ksocknal_index2iface(route->ksnr_peer->ksnp_ni,
 497                                              route->ksnr_myiface);
 498                 if (iface)
 499                         iface->ksni_nroutes--;
 500         }
 501
 502         route->ksnr_deleted = 1;
 503         list_del(&route->ksnr_list);
 504         ksocknal_route_decref(route);           /* drop peer_ni's ref */
 505
 506         if (list_empty(&peer_ni->ksnp_routes) &&
 507             list_empty(&peer_ni->ksnp_conns)) {
 508                 /* I've just removed the last route to a peer_ni with no active
 509                  * connections */
 510                 ksocknal_unlink_peer_locked(peer_ni);
 511         }
 512 }
 513
 514 int
 515 ksocknal_add_peer(struct lnet_ni *ni, struct lnet_process_id id, __u32 ipaddr,
 516                   int port)
 517 {
 518         struct list_head *tmp;
 519         struct ksock_peer_ni *peer_ni;
 520         struct ksock_peer_ni *peer2;
 521         struct ksock_route *route;
 522         struct ksock_route *route2;
 523         struct sockaddr_in sa = {.sin_family = AF_INET};
 524
 525         if (id.nid == LNET_NID_ANY ||
 526             id.pid == LNET_PID_ANY)
 527                 return (-EINVAL);
 528
 529         /* Have a brand new peer_ni ready... */
 530         peer_ni = ksocknal_create_peer(ni, id);
 531         if (IS_ERR(peer_ni))
 532                 return PTR_ERR(peer_ni);
 533
 534         sa.sin_addr.s_addr = htonl(ipaddr);
 535         sa.sin_port = htons(port);
 536         route = ksocknal_create_route((struct sockaddr *)&sa);
 537         if (route == NULL) {
 538                 ksocknal_peer_decref(peer_ni);
 539                 return (-ENOMEM);
 540         }
 541
 542         write_lock_bh(&ksocknal_data.ksnd_global_lock);
 543
 544         /* always called with a ref on ni, so shutdown can't have started */
 545         LASSERT(atomic_read(&((struct ksock_net *)ni->ni_data)->ksnn_npeers)
 546                 >= 0);
 547
 548         peer2 = ksocknal_find_peer_locked(ni, id);
 549         if (peer2 != NULL) {
 550                 ksocknal_peer_decref(peer_ni);
 551                 peer_ni = peer2;
 552         } else {
 553                 /* peer_ni table takes my ref on peer_ni */
 554                 hash_add(ksocknal_data.ksnd_peers, &peer_ni->ksnp_list, id.nid);
 555         }
 556
 557         route2 = NULL;
 558         list_for_each(tmp, &peer_ni->ksnp_routes) {
 559                 route2 = list_entry(tmp, struct ksock_route, ksnr_list);
 560
 561                 if (route2->ksnr_addr.ss_family == AF_INET &&
 562                     ((struct sockaddr_in *)&route2->ksnr_addr)->sin_addr.s_addr
 563                     == htonl(ipaddr))
 564                         break;
 565
 566                 route2 = NULL;
 567         }
 568         if (route2 == NULL) {
 569                 ksocknal_add_route_locked(peer_ni, route);
 570                 route->ksnr_share_count++;
 571         } else {
 572                 ksocknal_route_decref(route);
 573                 route2->ksnr_share_count++;
 574         }
 575
 576         write_unlock_bh(&ksocknal_data.ksnd_global_lock);
 577
 578         return 0;
 579 }
 580
 581 static void
 582 ksocknal_del_peer_locked(struct ksock_peer_ni *peer_ni, __u32 ip)
 583 {
 584         struct ksock_conn *conn;
 585         struct ksock_conn *cnxt;
 586         struct ksock_route *route;
 587         struct ksock_route *rnxt;
 588         int nshared;
 589
 590         LASSERT(!peer_ni->ksnp_closing);
 591
 592         /* Extra ref prevents peer_ni disappearing until I'm done with it */
 593         ksocknal_peer_addref(peer_ni);
 594
 595         list_for_each_entry_safe(route, rnxt, &peer_ni->ksnp_routes,
 596                                  ksnr_list) {
 597                 /* no match */
 598                 if (ip) {
 599                         if (route->ksnr_addr.ss_family != AF_INET)
 600                                 continue;
 601                         if (((struct sockaddr_in *)&route->ksnr_addr)
 602                                         ->sin_addr.s_addr != htonl(ip))
 603                                 continue;
 604                 }
 605
 606                 route->ksnr_share_count = 0;
 607                 /* This deletes associated conns too */
 608                 ksocknal_del_route_locked(route);
 609         }
 610
 611         nshared = 0;
 612         list_for_each_entry(route, &peer_ni->ksnp_routes, ksnr_list)
 613                 nshared += route->ksnr_share_count;
 614
 615         if (nshared == 0) {
 616                 /* remove everything else if there are no explicit entries
 617                  * left
 618                  */
 619                 list_for_each_entry_safe(route, rnxt, &peer_ni->ksnp_routes,
 620                                          ksnr_list) {
 621                         /* we should only be removing auto-entries */
 622                         LASSERT(route->ksnr_share_count == 0);
 623                         ksocknal_del_route_locked(route);
 624                 }
 625
 626                 list_for_each_entry_safe(conn, cnxt, &peer_ni->ksnp_conns,
 627                                          ksnc_list)
 628                         ksocknal_close_conn_locked(conn, 0);
 629         }
 630
 631         ksocknal_peer_decref(peer_ni);
 632         /* NB peer_ni unlinks itself when last conn/route is removed */
 633 }
 634
 635 static int
 636 ksocknal_del_peer(struct lnet_ni *ni, struct lnet_process_id id, __u32 ip)
 637 {
 638         LIST_HEAD(zombies);
 639         struct hlist_node *pnxt;
 640         struct ksock_peer_ni *peer_ni;
 641         int lo;
 642         int hi;
 643         int i;
 644         int rc = -ENOENT;
 645
 646         write_lock_bh(&ksocknal_data.ksnd_global_lock);
 647
 648         if (id.nid != LNET_NID_ANY) {
 649                 lo = hash_min(id.nid, HASH_BITS(ksocknal_data.ksnd_peers));
 650                 hi = lo;
 651         } else {
 652                 lo = 0;
 653                 hi = HASH_SIZE(ksocknal_data.ksnd_peers) - 1;
 654         }
 655
 656         for (i = lo; i <= hi; i++) {
 657                 hlist_for_each_entry_safe(peer_ni, pnxt,
 658                                           &ksocknal_data.ksnd_peers[i],
 659                                           ksnp_list) {
 660                         if (peer_ni->ksnp_ni != ni)
 661                                 continue;
 662
 663                         if (!((id.nid == LNET_NID_ANY ||
 664                                peer_ni->ksnp_id.nid == id.nid) &&
 665                               (id.pid == LNET_PID_ANY ||
 666                                peer_ni->ksnp_id.pid == id.pid)))
 667                                 continue;
 668
 669                         ksocknal_peer_addref(peer_ni);  /* a ref for me... */
 670
 671                         ksocknal_del_peer_locked(peer_ni, ip);
 672
 673                         if (peer_ni->ksnp_closing &&
 674                             !list_empty(&peer_ni->ksnp_tx_queue)) {
 675                                 LASSERT(list_empty(&peer_ni->ksnp_conns));
 676                                 LASSERT(list_empty(&peer_ni->ksnp_routes));
 677
 678                                 list_splice_init(&peer_ni->ksnp_tx_queue,
 679                                                  &zombies);
 680                         }
 681
 682                         ksocknal_peer_decref(peer_ni);  /* ...till here */
 683
 684                         rc = 0;                         /* matched! */
 685                 }
 686         }
 687
 688         write_unlock_bh(&ksocknal_data.ksnd_global_lock);
 689
 690         ksocknal_txlist_done(ni, &zombies, -ENETDOWN);
 691
 692         return rc;
 693 }
 694
 695 static struct ksock_conn *
 696 ksocknal_get_conn_by_idx(struct lnet_ni *ni, int index)
 697 {
 698         struct ksock_peer_ni *peer_ni;
 699         struct ksock_conn *conn;
 700         struct list_head *ctmp;
 701         int i;
 702
 703         read_lock(&ksocknal_data.ksnd_global_lock);
 704
 705         hash_for_each(ksocknal_data.ksnd_peers, i, peer_ni, ksnp_list) {
 706                 LASSERT(!peer_ni->ksnp_closing);
 707
 708                 if (peer_ni->ksnp_ni != ni)
 709                         continue;
 710
 711                 list_for_each(ctmp, &peer_ni->ksnp_conns) {
 712                         if (index-- > 0)
 713                                 continue;
 714
 715                         conn = list_entry(ctmp, struct ksock_conn,
 716                                           ksnc_list);
 717                         ksocknal_conn_addref(conn);
 718                         read_unlock(&ksocknal_data.ksnd_global_lock);
 719                         return conn;
 720                 }
 721         }
 722
 723         read_unlock(&ksocknal_data.ksnd_global_lock);
 724         return NULL;
 725 }
 726
 727 static struct ksock_sched *
 728 ksocknal_choose_scheduler_locked(unsigned int cpt)
 729 {
 730         struct ksock_sched *sched = ksocknal_data.ksnd_schedulers[cpt];
 731         int i;
 732
 733         if (sched->kss_nthreads == 0) {
 734                 cfs_percpt_for_each(sched, i, ksocknal_data.ksnd_schedulers) {
 735                         if (sched->kss_nthreads > 0) {
 736                                 CDEBUG(D_NET, "scheduler[%d] has no threads. selected scheduler[%d]\n",
 737                                        cpt, sched->kss_cpt);
 738                                 return sched;
 739                         }
 740                 }
 741                 return NULL;
 742         }
 743
 744         return sched;
 745 }
 746
 747 static int
 748 ksocknal_local_ipvec(struct lnet_ni *ni, __u32 *ipaddrs)
 749 {
 750         struct ksock_net *net = ni->ni_data;
 751         int i, j;
 752         int nip;
 753
 754         read_lock(&ksocknal_data.ksnd_global_lock);
 755
 756         nip = net->ksnn_ninterfaces;
 757         LASSERT(nip <= LNET_INTERFACES_NUM);
 758
 759         for (i = 0, j = 0; i < nip; i++)
 760                 if (net->ksnn_interfaces[i].ksni_addr.ss_family == AF_INET) {
 761                         struct sockaddr_in *sa =
 762                                 (void *)&net->ksnn_interfaces[i].ksni_addr;
 763
 764                         ipaddrs[j] = ntohl(sa->sin_addr.s_addr);
 765                         LASSERT(ipaddrs[j] != 0);
 766                         j += 1;
 767                 }
 768         nip = j;
 769
 770         read_unlock(&ksocknal_data.ksnd_global_lock);
 771         /*
 772          * Only offer interfaces for additional connections if I have
 773          * more than one.
 774          */
 775         return nip < 2 ? 0 : nip;
 776 }
 777
 778 static int
 779 ksocknal_match_peerip(struct ksock_interface *iface, __u32 *ips, int nips)
 780 {
 781         int best_netmatch = 0;
 782         int best_xor = 0;
 783         int best = -1;
 784         int this_xor;
 785         int this_netmatch;
 786         int i;
 787         struct sockaddr_in *sa;
 788         __u32 ip;
 789
 790         sa = (struct sockaddr_in *)&iface->ksni_addr;
 791         LASSERT(sa->sin_family == AF_INET);
 792         ip = ntohl(sa->sin_addr.s_addr);
 793
 794         for (i = 0; i < nips; i++) {
 795                 if (ips[i] == 0)
 796                         continue;
 797
 798                 this_xor = ips[i] ^ ip;
 799                 this_netmatch = ((this_xor & iface->ksni_netmask) == 0) ? 1 : 0;
 800
 801                 if (!(best < 0 ||
 802                       best_netmatch < this_netmatch ||
 803                       (best_netmatch == this_netmatch &&
 804                        best_xor > this_xor)))
 805                         continue;
 806
 807                 best = i;
 808                 best_netmatch = this_netmatch;
 809                 best_xor = this_xor;
 810         }
 811
 812         LASSERT(best >= 0);
 813         return best;
 814 }
 815
 816 static int
 817 ksocknal_select_ips(struct ksock_peer_ni *peer_ni, __u32 *peerips, int n_peerips)
 818 {
 819         rwlock_t *global_lock = &ksocknal_data.ksnd_global_lock;
 820         struct ksock_net *net = peer_ni->ksnp_ni->ni_data;
 821         struct ksock_interface *iface;
 822         struct ksock_interface *best_iface;
 823         int n_ips;
 824         int i;
 825         int j;
 826         int k;
 827         u32 ip;
 828         u32 xor;
 829         int this_netmatch;
 830         int best_netmatch;
 831         int best_npeers;
 832
 833         /* CAVEAT EMPTOR: We do all our interface matching with an
 834          * exclusive hold of global lock at IRQ priority.  We're only
 835          * expecting to be dealing with small numbers of interfaces, so the
 836          * O(n**3)-ness shouldn't matter */
 837
 838         /* Also note that I'm not going to return more than n_peerips
 839          * interfaces, even if I have more myself */
 840
 841         write_lock_bh(global_lock);
 842
 843         LASSERT(n_peerips <= LNET_INTERFACES_NUM);
 844         LASSERT(net->ksnn_ninterfaces <= LNET_INTERFACES_NUM);
 845
 846         /* Only match interfaces for additional connections
 847          * if I have > 1 interface
 848          */
 849         n_ips = (net->ksnn_ninterfaces < 2) ? 0 :
 850                 min(n_peerips, net->ksnn_ninterfaces);
 851
 852         for (i = 0; peer_ni->ksnp_n_passive_ips < n_ips; i++) {
 853                 /*              ^ yes really... */
 854
 855                 /* If we have any new interfaces, first tick off all the
 856                  * peer_ni IPs that match old interfaces, then choose new
 857                  * interfaces to match the remaining peer_ni IPS.
 858                  * We don't forget interfaces we've stopped using; we might
 859                  * start using them again... */
 860
 861                 if (i < peer_ni->ksnp_n_passive_ips) {
 862                         /* Old interface. */
 863                         struct sockaddr_in sa = { .sin_family = AF_INET};
 864
 865                         sa.sin_addr.s_addr =
 866                                 htonl(peer_ni->ksnp_passive_ips[i]);
 867                         best_iface = ksocknal_ip2iface(peer_ni->ksnp_ni,
 868                                                        (struct sockaddr *)&sa);
 869
 870                         /* peer_ni passive ips are kept up to date */
 871                         LASSERT(best_iface != NULL);
 872                 } else {
 873                         /* choose a new interface */
 874                         struct sockaddr_in *sa;
 875
 876                         LASSERT (i == peer_ni->ksnp_n_passive_ips);
 877
 878                         best_iface = NULL;
 879                         best_netmatch = 0;
 880                         best_npeers = 0;
 881
 882                         for (j = 0; j < net->ksnn_ninterfaces; j++) {
 883                                 iface = &net->ksnn_interfaces[j];
 884                                 sa = (void *)&iface->ksni_addr;
 885                                 if (sa->sin_family != AF_INET)
 886                                         continue;
 887                                 ip = ntohl(sa->sin_addr.s_addr);
 888
 889                                 for (k = 0; k < peer_ni->ksnp_n_passive_ips; k++)
 890                                         if (peer_ni->ksnp_passive_ips[k] == ip)
 891                                                 break;
 892
 893                                 if (k < peer_ni->ksnp_n_passive_ips) /* using it already */
 894                                         continue;
 895
 896                                 k = ksocknal_match_peerip(iface, peerips, n_peerips);
 897                                 xor = (ip ^ peerips[k]);
 898                                 this_netmatch = ((xor & iface->ksni_netmask) == 0) ? 1 : 0;
 899
 900                                 if (!(best_iface == NULL ||
 901                                       best_netmatch < this_netmatch ||
 902                                       (best_netmatch == this_netmatch &&
 903                                        best_npeers > iface->ksni_npeers)))
 904                                         continue;
 905
 906                                 best_iface = iface;
 907                                 best_netmatch = this_netmatch;
 908                                 best_npeers = iface->ksni_npeers;
 909                         }
 910
 911                         LASSERT(best_iface != NULL);
 912
 913                         best_iface->ksni_npeers++;
 914                         sa = (void *)&best_iface->ksni_addr;
 915                         ip = ntohl(sa->sin_addr.s_addr);
 916                         peer_ni->ksnp_passive_ips[i] = ip;
 917                         peer_ni->ksnp_n_passive_ips = i+1;
 918                 }
 919
 920                 /* mark the best matching peer_ni IP used */
 921                 j = ksocknal_match_peerip(best_iface, peerips, n_peerips);
 922                 peerips[j] = 0;
 923         }
 924
 925         /* Overwrite input peer_ni IP addresses */
 926         memcpy(peerips, peer_ni->ksnp_passive_ips, n_ips * sizeof(*peerips));
 927
 928         write_unlock_bh(global_lock);
 929
 930         return (n_ips);
 931 }
 932
 933 static void
 934 ksocknal_create_routes(struct ksock_peer_ni *peer_ni, int port,
 935                        __u32 *peer_ipaddrs, int npeer_ipaddrs)
 936 {
 937         struct ksock_route              *newroute = NULL;
 938         rwlock_t                *global_lock = &ksocknal_data.ksnd_global_lock;
 939         struct lnet_ni *ni = peer_ni->ksnp_ni;
 940         struct ksock_net                *net = ni->ni_data;
 941         struct list_head        *rtmp;
 942         struct ksock_route              *route;
 943         struct ksock_interface  *iface;
 944         struct ksock_interface  *best_iface;
 945         int                     best_netmatch;
 946         int                     this_netmatch;
 947         int                     best_nroutes;
 948         int                     i;
 949         int                     j;
 950
 951         /* CAVEAT EMPTOR: We do all our interface matching with an
 952          * exclusive hold of global lock at IRQ priority.  We're only
 953          * expecting to be dealing with small numbers of interfaces, so the
 954          * O(n**3)-ness here shouldn't matter */
 955
 956         write_lock_bh(global_lock);
 957
 958         if (net->ksnn_ninterfaces < 2) {
 959                 /* Only create additional connections
 960                  * if I have > 1 interface */
 961                 write_unlock_bh(global_lock);
 962                 return;
 963         }
 964
 965         LASSERT(npeer_ipaddrs <= LNET_INTERFACES_NUM);
 966
 967         for (i = 0; i < npeer_ipaddrs; i++) {
 968                 if (newroute) {
 969                         struct sockaddr_in *sa = (void *)&newroute->ksnr_addr;
 970
 971                         memset(sa, 0, sizeof(*sa));
 972                         sa->sin_family = AF_INET;
 973                         sa->sin_addr.s_addr = htonl(peer_ipaddrs[i]);
 974                 } else {
 975                         struct sockaddr_in sa = {.sin_family = AF_INET};
 976
 977                         write_unlock_bh(global_lock);
 978
 979                         sa.sin_addr.s_addr = htonl(peer_ipaddrs[i]);
 980                         sa.sin_port = htons(port);
 981                         newroute =
 982                                 ksocknal_create_route((struct sockaddr *)&sa);
 983                         if (!newroute)
 984                                 return;
 985
 986                         write_lock_bh(global_lock);
 987                 }
 988
 989                 if (peer_ni->ksnp_closing) {
 990                         /* peer_ni got closed under me */
 991                         break;
 992                 }
 993
 994                 /* Already got a route? */
 995                 route = NULL;
 996                 list_for_each(rtmp, &peer_ni->ksnp_routes) {
 997                         route = list_entry(rtmp, struct ksock_route, ksnr_list);
 998
 999                         if (rpc_cmp_addr(
1000                                     (struct sockaddr *)&route->ksnr_addr,
1001                                     (struct sockaddr *)&newroute->ksnr_addr))
1002                                 break;
1003
1004                         route = NULL;
1005                 }
1006                 if (route != NULL)
1007                         continue;
1008
1009                 best_iface = NULL;
1010                 best_nroutes = 0;
1011                 best_netmatch = 0;
1012
1013                 LASSERT(net->ksnn_ninterfaces <= LNET_INTERFACES_NUM);
1014
1015                 /* Select interface to connect from */
1016                 for (j = 0; j < net->ksnn_ninterfaces; j++) {
1017                         __u32 iface_ip, route_ip;
1018
1019                         iface = &net->ksnn_interfaces[j];
1020
1021                         /* Using this interface already? */
1022                         list_for_each(rtmp, &peer_ni->ksnp_routes) {
1023                                 route = list_entry(rtmp, struct ksock_route,
1024                                                    ksnr_list);
1025
1026                                 if (route->ksnr_myiface == iface->ksni_index)
1027                                         break;
1028
1029                                 route = NULL;
1030                         }
1031                         if (route != NULL)
1032                                 continue;
1033                         if (iface->ksni_addr.ss_family != AF_INET)
1034                                 continue;
1035                         if (newroute->ksnr_addr.ss_family != AF_INET)
1036                                 continue;
1037
1038                         iface_ip =
1039                                 ntohl(((struct sockaddr_in *)
1040                                        &iface->ksni_addr)->sin_addr.s_addr);
1041                         route_ip =
1042                                 ntohl(((struct sockaddr_in *)
1043                                        &newroute->ksnr_addr)->sin_addr.s_addr);
1044
1045                         this_netmatch = (((iface_ip ^ route_ip) &
1046                                           iface->ksni_netmask) == 0) ? 1 : 0;
1047
1048                         if (!(best_iface == NULL ||
1049                               best_netmatch < this_netmatch ||
1050                               (best_netmatch == this_netmatch &&
1051                                best_nroutes > iface->ksni_nroutes)))
1052                                 continue;
1053
1054                         best_iface = iface;
1055                         best_netmatch = this_netmatch;
1056                         best_nroutes = iface->ksni_nroutes;
1057                 }
1058
1059                 if (best_iface == NULL)
1060                         continue;
1061
1062                 newroute->ksnr_myiface = best_iface->ksni_index;
1063                 best_iface->ksni_nroutes++;
1064
1065                 ksocknal_add_route_locked(peer_ni, newroute);
1066                 newroute = NULL;
1067         }
1068
1069         write_unlock_bh(global_lock);
1070         if (newroute != NULL)
1071                 ksocknal_route_decref(newroute);
1072 }
1073
1074 int
1075 ksocknal_accept(struct lnet_ni *ni, struct socket *sock)
1076 {
1077         struct ksock_connreq *cr;
1078         int rc;
1079         struct sockaddr_storage peer;
1080
1081         rc = lnet_sock_getaddr(sock, true, &peer);
1082         LASSERT(rc == 0);               /* we succeeded before */
1083
1084         LIBCFS_ALLOC(cr, sizeof(*cr));
1085         if (cr == NULL) {
1086                 LCONSOLE_ERROR_MSG(0x12f,
1087                                    "Dropping connection request from %pIS: memory exhausted\n",
1088                                    &peer);
1089                 return -ENOMEM;
1090         }
1091
1092         lnet_ni_addref(ni);
1093         cr->ksncr_ni   = ni;
1094         cr->ksncr_sock = sock;
1095
1096         spin_lock_bh(&ksocknal_data.ksnd_connd_lock);
1097
1098         list_add_tail(&cr->ksncr_list, &ksocknal_data.ksnd_connd_connreqs);
1099         wake_up(&ksocknal_data.ksnd_connd_waitq);
1100
1101         spin_unlock_bh(&ksocknal_data.ksnd_connd_lock);
1102         return 0;
1103 }
1104
1105 static int
1106 ksocknal_connecting(struct ksock_peer_ni *peer_ni, struct sockaddr *sa)
1107 {
1108         struct ksock_route *route;
1109
1110         list_for_each_entry(route, &peer_ni->ksnp_routes, ksnr_list) {
1111                 if (rpc_cmp_addr((struct sockaddr *)&route->ksnr_addr, sa))
1112                         return route->ksnr_connecting;
1113         }
1114         return 0;
1115 }
1116
1117 int
1118 ksocknal_create_conn(struct lnet_ni *ni, struct ksock_route *route,
1119                      struct socket *sock, int type)
1120 {
1121         rwlock_t *global_lock = &ksocknal_data.ksnd_global_lock;
1122         LIST_HEAD(zombies);
1123         struct lnet_process_id peerid;
1124         struct list_head *tmp;
1125         u64 incarnation;
1126         struct ksock_conn *conn;
1127         struct ksock_conn *conn2;
1128         struct ksock_peer_ni *peer_ni = NULL;
1129         struct ksock_peer_ni *peer2;
1130         struct ksock_sched *sched;
1131         struct ksock_hello_msg *hello;
1132         int cpt;
1133         struct ksock_tx *tx;
1134         struct ksock_tx *txtmp;
1135         int rc;
1136         int rc2;
1137         int active;
1138         char *warn = NULL;
1139
1140         active = (route != NULL);
1141
1142         LASSERT (active == (type != SOCKLND_CONN_NONE));
1143
1144         LIBCFS_ALLOC(conn, sizeof(*conn));
1145         if (conn == NULL) {
1146                 rc = -ENOMEM;
1147                 goto failed_0;
1148         }
1149
1150         conn->ksnc_peer = NULL;
1151         conn->ksnc_route = NULL;
1152         conn->ksnc_sock = sock;
1153         /* 2 ref, 1 for conn, another extra ref prevents socket
1154          * being closed before establishment of connection */
1155         refcount_set(&conn->ksnc_sock_refcount, 2);
1156         conn->ksnc_type = type;
1157         ksocknal_lib_save_callback(sock, conn);
1158         refcount_set(&conn->ksnc_conn_refcount, 1); /* 1 ref for me */
1159
1160         conn->ksnc_rx_ready = 0;
1161         conn->ksnc_rx_scheduled = 0;
1162
1163         INIT_LIST_HEAD(&conn->ksnc_tx_queue);
1164         conn->ksnc_tx_ready = 0;
1165         conn->ksnc_tx_scheduled = 0;
1166         conn->ksnc_tx_carrier = NULL;
1167         atomic_set (&conn->ksnc_tx_nob, 0);
1168
1169         LIBCFS_ALLOC(hello, offsetof(struct ksock_hello_msg,
1170                                      kshm_ips[LNET_INTERFACES_NUM]));
1171         if (hello == NULL) {
1172                 rc = -ENOMEM;
1173                 goto failed_1;
1174         }
1175
1176         /* stash conn's local and remote addrs */
1177         rc = ksocknal_lib_get_conn_addrs (conn);
1178         if (rc != 0)
1179                 goto failed_1;
1180
1181         /* Find out/confirm peer_ni's NID and connection type and get the
1182          * vector of interfaces she's willing to let me connect to.
1183          * Passive connections use the listener timeout since the peer_ni sends
1184          * eagerly */
1185
1186         if (active) {
1187                 peer_ni = route->ksnr_peer;
1188                 LASSERT(ni == peer_ni->ksnp_ni);
1189
1190                 /* Active connection sends HELLO eagerly */
1191                 hello->kshm_nips = ksocknal_local_ipvec(ni, hello->kshm_ips);
1192                 peerid = peer_ni->ksnp_id;
1193
1194                 write_lock_bh(global_lock);
1195                 conn->ksnc_proto = peer_ni->ksnp_proto;
1196                 write_unlock_bh(global_lock);
1197
1198                 if (conn->ksnc_proto == NULL) {
1199                          conn->ksnc_proto = &ksocknal_protocol_v3x;
1200 #if SOCKNAL_VERSION_DEBUG
1201                          if (*ksocknal_tunables.ksnd_protocol == 2)
1202                                  conn->ksnc_proto = &ksocknal_protocol_v2x;
1203                          else if (*ksocknal_tunables.ksnd_protocol == 1)
1204                                  conn->ksnc_proto = &ksocknal_protocol_v1x;
1205 #endif
1206                 }
1207
1208                 rc = ksocknal_send_hello (ni, conn, peerid.nid, hello);
1209                 if (rc != 0)
1210                         goto failed_1;
1211         } else {
1212                 peerid.nid = LNET_NID_ANY;
1213                 peerid.pid = LNET_PID_ANY;
1214
1215                 /* Passive, get protocol from peer_ni */
1216                 conn->ksnc_proto = NULL;
1217         }
1218
1219         rc = ksocknal_recv_hello (ni, conn, hello, &peerid, &incarnation);
1220         if (rc < 0)
1221                 goto failed_1;
1222
1223         LASSERT (rc == 0 || active);
1224         LASSERT (conn->ksnc_proto != NULL);
1225         LASSERT (peerid.nid != LNET_NID_ANY);
1226
1227         cpt = lnet_cpt_of_nid(peerid.nid, ni);
1228
1229         if (active) {
1230                 ksocknal_peer_addref(peer_ni);
1231                 write_lock_bh(global_lock);
1232         } else {
1233                 peer_ni = ksocknal_create_peer(ni, peerid);
1234                 if (IS_ERR(peer_ni)) {
1235                         rc = PTR_ERR(peer_ni);
1236                         goto failed_1;
1237                 }
1238
1239                 write_lock_bh(global_lock);
1240
1241                 /* called with a ref on ni, so shutdown can't have started */
1242                 LASSERT(atomic_read(&((struct ksock_net *)ni->ni_data)->ksnn_npeers) >= 0);
1243
1244                 peer2 = ksocknal_find_peer_locked(ni, peerid);
1245                 if (peer2 == NULL) {
1246                         /* NB this puts an "empty" peer_ni in the peer_ni
1247                          * table (which takes my ref) */
1248                         hash_add(ksocknal_data.ksnd_peers,
1249                                  &peer_ni->ksnp_list, peerid.nid);
1250                 } else {
1251                         ksocknal_peer_decref(peer_ni);
1252                         peer_ni = peer2;
1253                 }
1254
1255                 /* +1 ref for me */
1256                 ksocknal_peer_addref(peer_ni);
1257                 peer_ni->ksnp_accepting++;
1258
1259                 /* Am I already connecting to this guy?  Resolve in
1260                  * favour of higher NID...
1261                  */
1262                 if (peerid.nid < ni->ni_nid &&
1263                     ksocknal_connecting(peer_ni, ((struct sockaddr *)
1264                                                   &conn->ksnc_peeraddr))) {
1265                         rc = EALREADY;
1266                         warn = "connection race resolution";
1267                         goto failed_2;
1268                 }
1269         }
1270
1271         if (peer_ni->ksnp_closing ||
1272             (active && route->ksnr_deleted)) {
1273                 /* peer_ni/route got closed under me */
1274                 rc = -ESTALE;
1275                 warn = "peer_ni/route removed";
1276                 goto failed_2;
1277         }
1278
1279         if (peer_ni->ksnp_proto == NULL) {
1280                 /* Never connected before.
1281                  * NB recv_hello may have returned EPROTO to signal my peer_ni
1282                  * wants a different protocol than the one I asked for.
1283                  */
1284                 LASSERT(list_empty(&peer_ni->ksnp_conns));
1285
1286                 peer_ni->ksnp_proto = conn->ksnc_proto;
1287                 peer_ni->ksnp_incarnation = incarnation;
1288         }
1289
1290         if (peer_ni->ksnp_proto != conn->ksnc_proto ||
1291             peer_ni->ksnp_incarnation != incarnation) {
1292                 /* peer_ni rebooted or I've got the wrong protocol version */
1293                 ksocknal_close_peer_conns_locked(peer_ni, NULL, 0);
1294
1295                 peer_ni->ksnp_proto = NULL;
1296                 rc = ESTALE;
1297                 warn = peer_ni->ksnp_incarnation != incarnation ?
1298                         "peer_ni rebooted" :
1299                         "wrong proto version";
1300                 goto failed_2;
1301         }
1302
1303         switch (rc) {
1304         default:
1305                 LBUG();
1306         case 0:
1307                 break;
1308         case EALREADY:
1309                 warn = "lost conn race";
1310                 goto failed_2;
1311         case EPROTO:
1312                 warn = "retry with different protocol version";
1313                 goto failed_2;
1314         }
1315
1316         /* Refuse to duplicate an existing connection, unless this is a
1317          * loopback connection */
1318         if (!rpc_cmp_addr((struct sockaddr *)&conn->ksnc_peeraddr,
1319                           (struct sockaddr *)&conn->ksnc_myaddr)) {
1320                 list_for_each(tmp, &peer_ni->ksnp_conns) {
1321                         conn2 = list_entry(tmp, struct ksock_conn, ksnc_list);
1322
1323                         if (!rpc_cmp_addr(
1324                                     (struct sockaddr *)&conn2->ksnc_peeraddr,
1325                                     (struct sockaddr *)&conn->ksnc_peeraddr) ||
1326                             !rpc_cmp_addr(
1327                                     (struct sockaddr *)&conn2->ksnc_myaddr,
1328                                     (struct sockaddr *)&conn->ksnc_myaddr) ||
1329                             conn2->ksnc_type != conn->ksnc_type)
1330                                 continue;
1331
1332                         /* Reply on a passive connection attempt so the peer_ni
1333                          * realises we're connected. */
1334                         LASSERT (rc == 0);
1335                         if (!active)
1336                                 rc = EALREADY;
1337
1338                         warn = "duplicate";
1339                         goto failed_2;
1340                 }
1341         }
1342
1343         /* If the connection created by this route didn't bind to the IP
1344          * address the route connected to, the connection/route matching
1345          * code below probably isn't going to work. */
1346         if (active &&
1347             !rpc_cmp_addr((struct sockaddr *)&route->ksnr_addr,
1348                           (struct sockaddr *)&conn->ksnc_peeraddr)) {
1349                 CERROR("Route %s %pIS connected to %pIS\n",
1350                        libcfs_id2str(peer_ni->ksnp_id),
1351                        &route->ksnr_addr,
1352                        &conn->ksnc_peeraddr);
1353         }
1354
1355         /* Search for a route corresponding to the new connection and
1356          * create an association.  This allows incoming connections created
1357          * by routes in my peer_ni to match my own route entries so I don't
1358          * continually create duplicate routes. */
1359         list_for_each(tmp, &peer_ni->ksnp_routes) {
1360                 route = list_entry(tmp, struct ksock_route, ksnr_list);
1361
1362                 if (!rpc_cmp_addr((struct sockaddr *)&route->ksnr_addr,
1363                                   (struct sockaddr *)&conn->ksnc_peeraddr))
1364                         continue;
1365
1366                 ksocknal_associate_route_conn_locked(route, conn);
1367                 break;
1368         }
1369
1370         conn->ksnc_peer = peer_ni;                 /* conn takes my ref on peer_ni */
1371         peer_ni->ksnp_last_alive = ktime_get_seconds();
1372         peer_ni->ksnp_send_keepalive = 0;
1373         peer_ni->ksnp_error = 0;
1374
1375         sched = ksocknal_choose_scheduler_locked(cpt);
1376         if (!sched) {
1377                 CERROR("no schedulers available. node is unhealthy\n");
1378                 goto failed_2;
1379         }
1380         /*
1381          * The cpt might have changed if we ended up selecting a non cpt
1382          * native scheduler. So use the scheduler's cpt instead.
1383          */
1384         cpt = sched->kss_cpt;
1385         sched->kss_nconns++;
1386         conn->ksnc_scheduler = sched;
1387
1388         conn->ksnc_tx_last_post = ktime_get_seconds();
1389         /* Set the deadline for the outgoing HELLO to drain */
1390         conn->ksnc_tx_bufnob = sock->sk->sk_wmem_queued;
1391         conn->ksnc_tx_deadline = ktime_get_seconds() +
1392                                  ksocknal_timeout();
1393         smp_mb();   /* order with adding to peer_ni's conn list */
1394
1395         list_add(&conn->ksnc_list, &peer_ni->ksnp_conns);
1396         ksocknal_conn_addref(conn);
1397
1398         ksocknal_new_packet(conn, 0);
1399
1400         conn->ksnc_zc_capable = ksocknal_lib_zc_capable(conn);
1401
1402         /* Take packets blocking for this connection. */
1403         list_for_each_entry_safe(tx, txtmp, &peer_ni->ksnp_tx_queue, tx_list) {
1404                 if (conn->ksnc_proto->pro_match_tx(conn, tx, tx->tx_nonblk) ==
1405                     SOCKNAL_MATCH_NO)
1406                         continue;
1407
1408                 list_del(&tx->tx_list);
1409                 ksocknal_queue_tx_locked(tx, conn);
1410         }
1411
1412         write_unlock_bh(global_lock);
1413
1414         /* We've now got a new connection.  Any errors from here on are just
1415          * like "normal" comms errors and we close the connection normally.
1416          * NB (a) we still have to send the reply HELLO for passive
1417          *        connections,
1418          *    (b) normal I/O on the conn is blocked until I setup and call the
1419          *        socket callbacks.
1420          */
1421
1422         CDEBUG(D_NET, "New conn %s p %d.x %pIS -> %pISp"
1423                " incarnation:%lld sched[%d]\n",
1424                libcfs_id2str(peerid), conn->ksnc_proto->pro_version,
1425                &conn->ksnc_myaddr, &conn->ksnc_peeraddr,
1426                incarnation, cpt);
1427
1428         if (active) {
1429                 /* additional routes after interface exchange? */
1430                 ksocknal_create_routes(
1431                         peer_ni,
1432                         rpc_get_port((struct sockaddr *)&conn->ksnc_peeraddr),
1433                         hello->kshm_ips, hello->kshm_nips);
1434         } else {
1435                 hello->kshm_nips = ksocknal_select_ips(peer_ni, hello->kshm_ips,
1436                                                        hello->kshm_nips);
1437                 rc = ksocknal_send_hello(ni, conn, peerid.nid, hello);
1438         }
1439
1440         LIBCFS_FREE(hello, offsetof(struct ksock_hello_msg,
1441                                     kshm_ips[LNET_INTERFACES_NUM]));
1442
1443         /* setup the socket AFTER I've received hello (it disables
1444          * SO_LINGER).  I might call back to the acceptor who may want
1445          * to send a protocol version response and then close the
1446          * socket; this ensures the socket only tears down after the
1447          * response has been sent. */
1448         if (rc == 0)
1449                 rc = ksocknal_lib_setup_sock(sock);
1450
1451         write_lock_bh(global_lock);
1452
1453         /* NB my callbacks block while I hold ksnd_global_lock */
1454         ksocknal_lib_set_callback(sock, conn);
1455
1456         if (!active)
1457                 peer_ni->ksnp_accepting--;
1458
1459         write_unlock_bh(global_lock);
1460
1461         if (rc != 0) {
1462                 write_lock_bh(global_lock);
1463                 if (!conn->ksnc_closing) {
1464                         /* could be closed by another thread */
1465                         ksocknal_close_conn_locked(conn, rc);
1466                 }
1467                 write_unlock_bh(global_lock);
1468         } else if (ksocknal_connsock_addref(conn) == 0) {
1469                 /* Allow I/O to proceed. */
1470                 ksocknal_read_callback(conn);
1471                 ksocknal_write_callback(conn);
1472                 ksocknal_connsock_decref(conn);
1473         }
1474
1475         ksocknal_connsock_decref(conn);
1476         ksocknal_conn_decref(conn);
1477         return rc;
1478
1479 failed_2:
1480         if (!peer_ni->ksnp_closing &&
1481             list_empty(&peer_ni->ksnp_conns) &&
1482             list_empty(&peer_ni->ksnp_routes)) {
1483                 list_splice_init(&peer_ni->ksnp_tx_queue, &zombies);
1484                 ksocknal_unlink_peer_locked(peer_ni);
1485         }
1486
1487         write_unlock_bh(global_lock);
1488
1489         if (warn != NULL) {
1490                 if (rc < 0)
1491                         CERROR("Not creating conn %s type %d: %s\n",
1492                                libcfs_id2str(peerid), conn->ksnc_type, warn);
1493                 else
1494                         CDEBUG(D_NET, "Not creating conn %s type %d: %s\n",
1495                               libcfs_id2str(peerid), conn->ksnc_type, warn);
1496         }
1497
1498         if (!active) {
1499                 if (rc > 0) {
1500                         /* Request retry by replying with CONN_NONE
1501                          * ksnc_proto has been set already */
1502                         conn->ksnc_type = SOCKLND_CONN_NONE;
1503                         hello->kshm_nips = 0;
1504                         ksocknal_send_hello(ni, conn, peerid.nid, hello);
1505                 }
1506
1507                 write_lock_bh(global_lock);
1508                 peer_ni->ksnp_accepting--;
1509                 write_unlock_bh(global_lock);
1510         }
1511
1512         /*
1513          * If we get here without an error code, just use -EALREADY.
1514          * Depending on how we got here, the error may be positive
1515          * or negative. Normalize the value for ksocknal_txlist_done().
1516          */
1517         rc2 = (rc == 0 ? -EALREADY : (rc > 0 ? -rc : rc));
1518         ksocknal_txlist_done(ni, &zombies, rc2);
1519         ksocknal_peer_decref(peer_ni);
1520
1521 failed_1:
1522         if (hello != NULL)
1523                 LIBCFS_FREE(hello, offsetof(struct ksock_hello_msg,
1524                                             kshm_ips[LNET_INTERFACES_NUM]));
1525
1526         LIBCFS_FREE(conn, sizeof(*conn));
1527
1528 failed_0:
1529         sock_release(sock);
1530         return rc;
1531 }
1532
1533 void
1534 ksocknal_close_conn_locked(struct ksock_conn *conn, int error)
1535 {
1536         /* This just does the immmediate housekeeping, and queues the
1537          * connection for the reaper to terminate.
1538          * Caller holds ksnd_global_lock exclusively in irq context */
1539         struct ksock_peer_ni *peer_ni = conn->ksnc_peer;
1540         struct ksock_route *route;
1541         struct ksock_conn *conn2;
1542         struct list_head *tmp;
1543
1544         LASSERT(peer_ni->ksnp_error == 0);
1545         LASSERT(!conn->ksnc_closing);
1546         conn->ksnc_closing = 1;
1547
1548         /* ksnd_deathrow_conns takes over peer_ni's ref */
1549         list_del(&conn->ksnc_list);
1550
1551         route = conn->ksnc_route;
1552         if (route != NULL) {
1553                 /* dissociate conn from route... */
1554                 LASSERT(!route->ksnr_deleted);
1555                 LASSERT((route->ksnr_connected & BIT(conn->ksnc_type)) != 0);
1556
1557                 conn2 = NULL;
1558                 list_for_each(tmp, &peer_ni->ksnp_conns) {
1559                         conn2 = list_entry(tmp, struct ksock_conn, ksnc_list);
1560
1561                         if (conn2->ksnc_route == route &&
1562                             conn2->ksnc_type == conn->ksnc_type)
1563                                 break;
1564
1565                         conn2 = NULL;
1566                 }
1567                 if (conn2 == NULL)
1568                         route->ksnr_connected &= ~BIT(conn->ksnc_type);
1569
1570                 conn->ksnc_route = NULL;
1571
1572                 ksocknal_route_decref(route);   /* drop conn's ref on route */
1573         }
1574
1575         if (list_empty(&peer_ni->ksnp_conns)) {
1576                 /* No more connections to this peer_ni */
1577
1578                 if (!list_empty(&peer_ni->ksnp_tx_queue)) {
1579                         struct ksock_tx *tx;
1580
1581                         LASSERT(conn->ksnc_proto == &ksocknal_protocol_v3x);
1582
1583                         /* throw them to the last connection...,
1584                          * these TXs will be send to /dev/null by scheduler */
1585                         list_for_each_entry(tx, &peer_ni->ksnp_tx_queue,
1586                                             tx_list)
1587                                 ksocknal_tx_prep(conn, tx);
1588
1589                         spin_lock_bh(&conn->ksnc_scheduler->kss_lock);
1590                         list_splice_init(&peer_ni->ksnp_tx_queue,
1591                                          &conn->ksnc_tx_queue);
1592                         spin_unlock_bh(&conn->ksnc_scheduler->kss_lock);
1593                 }
1594
1595                 /* renegotiate protocol version */
1596                 peer_ni->ksnp_proto = NULL;
1597                 /* stash last conn close reason */
1598                 peer_ni->ksnp_error = error;
1599
1600                 if (list_empty(&peer_ni->ksnp_routes)) {
1601                         /* I've just closed last conn belonging to a
1602                          * peer_ni with no routes to it */
1603                         ksocknal_unlink_peer_locked(peer_ni);
1604                 }
1605         }
1606
1607         spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
1608
1609         list_add_tail(&conn->ksnc_list, &ksocknal_data.ksnd_deathrow_conns);
1610         wake_up(&ksocknal_data.ksnd_reaper_waitq);
1611
1612         spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
1613 }
1614
1615 void
1616 ksocknal_peer_failed(struct ksock_peer_ni *peer_ni)
1617 {
1618         int notify = 0;
1619         time64_t last_alive = 0;
1620
1621         /* There has been a connection failure or comms error; but I'll only
1622          * tell LNET I think the peer_ni is dead if it's to another kernel and
1623          * there are no connections or connection attempts in existence. */
1624
1625         read_lock(&ksocknal_data.ksnd_global_lock);
1626
1627         if ((peer_ni->ksnp_id.pid & LNET_PID_USERFLAG) == 0 &&
1628              list_empty(&peer_ni->ksnp_conns) &&
1629              peer_ni->ksnp_accepting == 0 &&
1630              ksocknal_find_connecting_route_locked(peer_ni) == NULL) {
1631                 notify = 1;
1632                 last_alive = peer_ni->ksnp_last_alive;
1633         }
1634
1635         read_unlock(&ksocknal_data.ksnd_global_lock);
1636
1637         if (notify)
1638                 lnet_notify(peer_ni->ksnp_ni, peer_ni->ksnp_id.nid,
1639                             false, false, last_alive);
1640 }
1641
1642 void
1643 ksocknal_finalize_zcreq(struct ksock_conn *conn)
1644 {
1645         struct ksock_peer_ni *peer_ni = conn->ksnc_peer;
1646         struct ksock_tx *tx;
1647         struct ksock_tx *tmp;
1648         LIST_HEAD(zlist);
1649
1650         /* NB safe to finalize TXs because closing of socket will
1651          * abort all buffered data */
1652         LASSERT(conn->ksnc_sock == NULL);
1653
1654         spin_lock(&peer_ni->ksnp_lock);
1655
1656         list_for_each_entry_safe(tx, tmp, &peer_ni->ksnp_zc_req_list, tx_zc_list) {
1657                 if (tx->tx_conn != conn)
1658                         continue;
1659
1660                 LASSERT(tx->tx_msg.ksm_zc_cookies[0] != 0);
1661
1662                 tx->tx_msg.ksm_zc_cookies[0] = 0;
1663                 tx->tx_zc_aborted = 1;  /* mark it as not-acked */
1664                 list_move(&tx->tx_zc_list, &zlist);
1665         }
1666
1667         spin_unlock(&peer_ni->ksnp_lock);
1668
1669         while (!list_empty(&zlist)) {
1670                 tx = list_entry(zlist.next, struct ksock_tx, tx_zc_list);
1671
1672                 list_del(&tx->tx_zc_list);
1673                 ksocknal_tx_decref(tx);
1674         }
1675 }
1676
1677 void
1678 ksocknal_terminate_conn(struct ksock_conn *conn)
1679 {
1680         /* This gets called by the reaper (guaranteed thread context) to
1681          * disengage the socket from its callbacks and close it.
1682          * ksnc_refcount will eventually hit zero, and then the reaper will
1683          * destroy it. */
1684         struct ksock_peer_ni *peer_ni = conn->ksnc_peer;
1685         struct ksock_sched *sched = conn->ksnc_scheduler;
1686         int failed = 0;
1687
1688         LASSERT(conn->ksnc_closing);
1689
1690         /* wake up the scheduler to "send" all remaining packets to /dev/null */
1691         spin_lock_bh(&sched->kss_lock);
1692
1693         /* a closing conn is always ready to tx */
1694         conn->ksnc_tx_ready = 1;
1695
1696         if (!conn->ksnc_tx_scheduled &&
1697             !list_empty(&conn->ksnc_tx_queue)) {
1698                 list_add_tail(&conn->ksnc_tx_list,
1699                                &sched->kss_tx_conns);
1700                 conn->ksnc_tx_scheduled = 1;
1701                 /* extra ref for scheduler */
1702                 ksocknal_conn_addref(conn);
1703
1704                 wake_up (&sched->kss_waitq);
1705         }
1706
1707         spin_unlock_bh(&sched->kss_lock);
1708
1709         /* serialise with callbacks */
1710         write_lock_bh(&ksocknal_data.ksnd_global_lock);
1711
1712         ksocknal_lib_reset_callback(conn->ksnc_sock, conn);
1713
1714         /* OK, so this conn may not be completely disengaged from its
1715          * scheduler yet, but it _has_ committed to terminate... */
1716         conn->ksnc_scheduler->kss_nconns--;
1717
1718         if (peer_ni->ksnp_error != 0) {
1719                 /* peer_ni's last conn closed in error */
1720                 LASSERT(list_empty(&peer_ni->ksnp_conns));
1721                 failed = 1;
1722                 peer_ni->ksnp_error = 0;     /* avoid multiple notifications */
1723         }
1724
1725         write_unlock_bh(&ksocknal_data.ksnd_global_lock);
1726
1727         if (failed)
1728                 ksocknal_peer_failed(peer_ni);
1729
1730         /* The socket is closed on the final put; either here, or in
1731          * ksocknal_{send,recv}msg().  Since we set up the linger2 option
1732          * when the connection was established, this will close the socket
1733          * immediately, aborting anything buffered in it. Any hung
1734          * zero-copy transmits will therefore complete in finite time. */
1735         ksocknal_connsock_decref(conn);
1736 }
1737
1738 void
1739 ksocknal_queue_zombie_conn(struct ksock_conn *conn)
1740 {
1741         /* Queue the conn for the reaper to destroy */
1742         LASSERT(refcount_read(&conn->ksnc_conn_refcount) == 0);
1743         spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
1744
1745         list_add_tail(&conn->ksnc_list, &ksocknal_data.ksnd_zombie_conns);
1746         wake_up(&ksocknal_data.ksnd_reaper_waitq);
1747
1748         spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
1749 }
1750
1751 void
1752 ksocknal_destroy_conn(struct ksock_conn *conn)
1753 {
1754         time64_t last_rcv;
1755
1756         /* Final coup-de-grace of the reaper */
1757         CDEBUG (D_NET, "connection %p\n", conn);
1758
1759         LASSERT(refcount_read(&conn->ksnc_conn_refcount) == 0);
1760         LASSERT(refcount_read(&conn->ksnc_sock_refcount) == 0);
1761         LASSERT (conn->ksnc_sock == NULL);
1762         LASSERT (conn->ksnc_route == NULL);
1763         LASSERT (!conn->ksnc_tx_scheduled);
1764         LASSERT (!conn->ksnc_rx_scheduled);
1765         LASSERT(list_empty(&conn->ksnc_tx_queue));
1766
1767         /* complete current receive if any */
1768         switch (conn->ksnc_rx_state) {
1769         case SOCKNAL_RX_LNET_PAYLOAD:
1770                 last_rcv = conn->ksnc_rx_deadline -
1771                            ksocknal_timeout();
1772                 CERROR("Completing partial receive from %s[%d], ip %pISp, with error, wanted: %d, left: %d, last alive is %lld secs ago\n",
1773                        libcfs_id2str(conn->ksnc_peer->ksnp_id), conn->ksnc_type,
1774                        &conn->ksnc_peeraddr,
1775                        conn->ksnc_rx_nob_wanted, conn->ksnc_rx_nob_left,
1776                        ktime_get_seconds() - last_rcv);
1777                 if (conn->ksnc_lnet_msg)
1778                         conn->ksnc_lnet_msg->msg_health_status =
1779                                 LNET_MSG_STATUS_REMOTE_ERROR;
1780                 lnet_finalize(conn->ksnc_lnet_msg, -EIO);
1781                 break;
1782         case SOCKNAL_RX_LNET_HEADER:
1783                 if (conn->ksnc_rx_started)
1784                         CERROR("Incomplete receive of lnet header from %s, ip %pISp, with error, protocol: %d.x.\n",
1785                                libcfs_id2str(conn->ksnc_peer->ksnp_id),
1786                                &conn->ksnc_peeraddr,
1787                                conn->ksnc_proto->pro_version);
1788                 break;
1789         case SOCKNAL_RX_KSM_HEADER:
1790                 if (conn->ksnc_rx_started)
1791                         CERROR("Incomplete receive of ksock message from %s, ip %pISp, with error, protocol: %d.x.\n",
1792                                libcfs_id2str(conn->ksnc_peer->ksnp_id),
1793                                &conn->ksnc_peeraddr,
1794                                conn->ksnc_proto->pro_version);
1795                 break;
1796         case SOCKNAL_RX_SLOP:
1797                 if (conn->ksnc_rx_started)
1798                         CERROR("Incomplete receive of slops from %s, ip %pISp, with error\n",
1799                                libcfs_id2str(conn->ksnc_peer->ksnp_id),
1800                                &conn->ksnc_peeraddr);
1801                break;
1802         default:
1803                 LBUG ();
1804                 break;
1805         }
1806
1807         ksocknal_peer_decref(conn->ksnc_peer);
1808
1809         LIBCFS_FREE (conn, sizeof (*conn));
1810 }
1811
1812 int
1813 ksocknal_close_peer_conns_locked(struct ksock_peer_ni *peer_ni,
1814                                  struct sockaddr *addr, int why)
1815 {
1816         struct ksock_conn *conn;
1817         struct ksock_conn *cnxt;
1818         int count = 0;
1819
1820         list_for_each_entry_safe(conn, cnxt, &peer_ni->ksnp_conns, ksnc_list) {
1821                 if (!addr ||
1822                     rpc_cmp_addr(addr,
1823                                  (struct sockaddr *)&conn->ksnc_peeraddr)) {
1824                         count++;
1825                         ksocknal_close_conn_locked(conn, why);
1826                 }
1827         }
1828
1829         return count;
1830 }
1831
1832 int
1833 ksocknal_close_conn_and_siblings(struct ksock_conn *conn, int why)
1834 {
1835         struct ksock_peer_ni *peer_ni = conn->ksnc_peer;
1836         int count;
1837
1838         write_lock_bh(&ksocknal_data.ksnd_global_lock);
1839
1840         count = ksocknal_close_peer_conns_locked(
1841                 peer_ni, (struct sockaddr *)&conn->ksnc_peeraddr, why);
1842
1843         write_unlock_bh(&ksocknal_data.ksnd_global_lock);
1844
1845         return count;
1846 }
1847
1848 int
1849 ksocknal_close_matching_conns(struct lnet_process_id id, __u32 ipaddr)
1850 {
1851         struct ksock_peer_ni *peer_ni;
1852         struct hlist_node *pnxt;
1853         int lo;
1854         int hi;
1855         int i;
1856         int count = 0;
1857         struct sockaddr_in sa = {.sin_family = AF_INET};
1858
1859         write_lock_bh(&ksocknal_data.ksnd_global_lock);
1860
1861         if (id.nid != LNET_NID_ANY) {
1862                 lo = hash_min(id.nid, HASH_BITS(ksocknal_data.ksnd_peers));
1863                 hi = lo;
1864         } else {
1865                 lo = 0;
1866                 hi = HASH_SIZE(ksocknal_data.ksnd_peers) - 1;
1867         }
1868
1869         sa.sin_addr.s_addr = htonl(ipaddr);
1870         for (i = lo; i <= hi; i++) {
1871                 hlist_for_each_entry_safe(peer_ni, pnxt,
1872                                           &ksocknal_data.ksnd_peers[i],
1873                                           ksnp_list) {
1874
1875                         if (!((id.nid == LNET_NID_ANY ||
1876                                id.nid == peer_ni->ksnp_id.nid) &&
1877                               (id.pid == LNET_PID_ANY ||
1878                                id.pid == peer_ni->ksnp_id.pid)))
1879                                 continue;
1880
1881                         count += ksocknal_close_peer_conns_locked(
1882                                 peer_ni,
1883                                 ipaddr ? (struct sockaddr *)&sa : NULL, 0);
1884                 }
1885         }
1886
1887         write_unlock_bh(&ksocknal_data.ksnd_global_lock);
1888
1889         /* wildcards always succeed */
1890         if (id.nid == LNET_NID_ANY || id.pid == LNET_PID_ANY || ipaddr == 0)
1891                 return 0;
1892
1893         return (count == 0 ? -ENOENT : 0);
1894 }
1895
1896 void
1897 ksocknal_notify_gw_down(lnet_nid_t gw_nid)
1898 {
1899         /* The router is telling me she's been notified of a change in
1900          * gateway state....
1901          */
1902         struct lnet_process_id id = {
1903                 .nid    = gw_nid,
1904                 .pid    = LNET_PID_ANY,
1905         };
1906
1907         CDEBUG(D_NET, "gw %s down\n", libcfs_nid2str(gw_nid));
1908
1909         /* If the gateway crashed, close all open connections... */
1910         ksocknal_close_matching_conns(id, 0);
1911         return;
1912
1913         /* We can only establish new connections
1914          * if we have autroutes, and these connect on demand. */
1915 }
1916
1917 static void
1918 ksocknal_push_peer(struct ksock_peer_ni *peer_ni)
1919 {
1920         int index;
1921         int i;
1922         struct list_head *tmp;
1923         struct ksock_conn *conn;
1924
1925         for (index = 0; ; index++) {
1926                 read_lock(&ksocknal_data.ksnd_global_lock);
1927
1928                 i = 0;
1929                 conn = NULL;
1930
1931                 list_for_each(tmp, &peer_ni->ksnp_conns) {
1932                         if (i++ == index) {
1933                                 conn = list_entry(tmp, struct ksock_conn,
1934                                                   ksnc_list);
1935                                 ksocknal_conn_addref(conn);
1936                                 break;
1937                         }
1938                 }
1939
1940                 read_unlock(&ksocknal_data.ksnd_global_lock);
1941
1942                 if (conn == NULL)
1943                         break;
1944
1945                 ksocknal_lib_push_conn (conn);
1946                 ksocknal_conn_decref(conn);
1947         }
1948 }
1949
1950 static int
1951 ksocknal_push(struct lnet_ni *ni, struct lnet_process_id id)
1952 {
1953         int lo;
1954         int hi;
1955         int bkt;
1956         int rc = -ENOENT;
1957
1958         if (id.nid != LNET_NID_ANY) {
1959                 lo = hash_min(id.nid, HASH_BITS(ksocknal_data.ksnd_peers));
1960                 hi = lo;
1961         } else {
1962                 lo = 0;
1963                 hi = HASH_SIZE(ksocknal_data.ksnd_peers) - 1;
1964         }
1965
1966         for (bkt = lo; bkt <= hi; bkt++) {
1967                 int peer_off; /* searching offset in peer_ni hash table */
1968
1969                 for (peer_off = 0; ; peer_off++) {
1970                         struct ksock_peer_ni *peer_ni;
1971                         int           i = 0;
1972
1973                         read_lock(&ksocknal_data.ksnd_global_lock);
1974                         hlist_for_each_entry(peer_ni,
1975                                              &ksocknal_data.ksnd_peers[bkt],
1976                                              ksnp_list) {
1977                                 if (!((id.nid == LNET_NID_ANY ||
1978                                        id.nid == peer_ni->ksnp_id.nid) &&
1979                                       (id.pid == LNET_PID_ANY ||
1980                                        id.pid == peer_ni->ksnp_id.pid)))
1981                                         continue;
1982
1983                                 if (i++ == peer_off) {
1984                                         ksocknal_peer_addref(peer_ni);
1985                                         break;
1986                                 }
1987                         }
1988                         read_unlock(&ksocknal_data.ksnd_global_lock);
1989
1990                         if (i <= peer_off) /* no match */
1991                                 break;
1992
1993                         rc = 0;
1994                         ksocknal_push_peer(peer_ni);
1995                         ksocknal_peer_decref(peer_ni);
1996                 }
1997         }
1998         return rc;
1999 }
2000
2001 static int
2002 ksocknal_add_interface(struct lnet_ni *ni, __u32 ipaddress, __u32 netmask)
2003 {
2004         struct ksock_net *net = ni->ni_data;
2005         struct ksock_interface *iface;
2006         struct sockaddr_in sa = { .sin_family = AF_INET };
2007         int rc;
2008         int i;
2009         int j;
2010         struct ksock_peer_ni *peer_ni;
2011         struct list_head *rtmp;
2012         struct ksock_route *route;
2013
2014         if (ipaddress == 0 ||
2015             netmask == 0)
2016                 return -EINVAL;
2017
2018         write_lock_bh(&ksocknal_data.ksnd_global_lock);
2019
2020         sa.sin_addr.s_addr = htonl(ipaddress);
2021         iface = ksocknal_ip2iface(ni, (struct sockaddr *)&sa);
2022         if (iface != NULL) {
2023                 /* silently ignore dups */
2024                 rc = 0;
2025         } else if (net->ksnn_ninterfaces == LNET_INTERFACES_NUM) {
2026                 rc = -ENOSPC;
2027         } else {
2028                 iface = &net->ksnn_interfaces[net->ksnn_ninterfaces++];
2029
2030                 iface->ksni_index = ksocknal_ip2index((struct sockaddr *)&sa,
2031                                                       ni);
2032                 rpc_copy_addr((struct sockaddr *)&iface->ksni_addr,
2033                               (struct sockaddr *)&sa);
2034                 iface->ksni_netmask = netmask;
2035                 iface->ksni_nroutes = 0;
2036                 iface->ksni_npeers = 0;
2037
2038                 hash_for_each(ksocknal_data.ksnd_peers, i, peer_ni, ksnp_list) {
2039                         for (j = 0; j < peer_ni->ksnp_n_passive_ips; j++)
2040                                 if (peer_ni->ksnp_passive_ips[j] == ipaddress)
2041                                         iface->ksni_npeers++;
2042
2043                         list_for_each(rtmp, &peer_ni->ksnp_routes) {
2044                                 route = list_entry(rtmp,
2045                                                    struct ksock_route,
2046                                                    ksnr_list);
2047
2048                                 if (route->ksnr_myiface ==
2049                                             iface->ksni_index)
2050                                         iface->ksni_nroutes++;
2051                         }
2052                 }
2053
2054                 rc = 0;
2055                 /* NB only new connections will pay attention to the new
2056                  * interface!
2057                  */
2058         }
2059
2060         write_unlock_bh(&ksocknal_data.ksnd_global_lock);
2061
2062         return rc;
2063 }
2064
2065 static void
2066 ksocknal_peer_del_interface_locked(struct ksock_peer_ni *peer_ni,
2067                                    __u32 ipaddr, int index)
2068 {
2069         struct ksock_route *route;
2070         struct ksock_route *rnxt;
2071         struct ksock_conn *conn;
2072         struct ksock_conn *cnxt;
2073         int i;
2074         int j;
2075
2076         for (i = 0; i < peer_ni->ksnp_n_passive_ips; i++)
2077                 if (peer_ni->ksnp_passive_ips[i] == ipaddr) {
2078                         for (j = i+1; j < peer_ni->ksnp_n_passive_ips; j++)
2079                                 peer_ni->ksnp_passive_ips[j-1] =
2080                                         peer_ni->ksnp_passive_ips[j];
2081                         peer_ni->ksnp_n_passive_ips--;
2082                         break;
2083                 }
2084
2085         list_for_each_entry_safe(route, rnxt, &peer_ni->ksnp_routes,
2086                                  ksnr_list) {
2087                 if (route->ksnr_myiface != index)
2088                         continue;
2089
2090                 if (route->ksnr_share_count != 0) {
2091                         /* Manually created; keep, but unbind */
2092                         route->ksnr_myiface = -1;
2093                 } else {
2094                         ksocknal_del_route_locked(route);
2095                 }
2096         }
2097
2098         list_for_each_entry_safe(conn, cnxt, &peer_ni->ksnp_conns, ksnc_list)
2099                 if (conn->ksnc_route->ksnr_myiface == index)
2100                         ksocknal_close_conn_locked (conn, 0);
2101 }
2102
2103 static int
2104 ksocknal_del_interface(struct lnet_ni *ni, __u32 ipaddress)
2105 {
2106         struct ksock_net *net = ni->ni_data;
2107         int rc = -ENOENT;
2108         struct hlist_node *nxt;
2109         struct ksock_peer_ni *peer_ni;
2110         u32 this_ip;
2111         struct sockaddr_in sa = {.sin_family = AF_INET };
2112         int index;
2113         int i;
2114         int j;
2115
2116         sa.sin_addr.s_addr = htonl(ipaddress);
2117         index = ksocknal_ip2index((struct sockaddr *)&sa, ni);
2118
2119         write_lock_bh(&ksocknal_data.ksnd_global_lock);
2120
2121         for (i = 0; i < net->ksnn_ninterfaces; i++) {
2122                 struct sockaddr_in *sa =
2123                         (void *)&net->ksnn_interfaces[i].ksni_addr;
2124
2125                 if (sa->sin_family != AF_INET)
2126                         continue;
2127                 this_ip = ntohl(sa->sin_addr.s_addr);
2128
2129                 if (!(ipaddress == 0 ||
2130                       ipaddress == this_ip))
2131                         continue;
2132
2133                 rc = 0;
2134
2135                 for (j = i+1; j < net->ksnn_ninterfaces; j++)
2136                         net->ksnn_interfaces[j-1] =
2137                                 net->ksnn_interfaces[j];
2138
2139                 net->ksnn_ninterfaces--;
2140
2141                 hash_for_each_safe(ksocknal_data.ksnd_peers, j,
2142                                    nxt, peer_ni, ksnp_list) {
2143                         if (peer_ni->ksnp_ni != ni)
2144                                 continue;
2145
2146                         ksocknal_peer_del_interface_locked(peer_ni,
2147                                                            this_ip, index);
2148                 }
2149         }
2150
2151         write_unlock_bh(&ksocknal_data.ksnd_global_lock);
2152
2153         return rc;
2154 }
2155
2156 int
2157 ksocknal_ctl(struct lnet_ni *ni, unsigned int cmd, void *arg)
2158 {
2159         struct lnet_process_id id = {0};
2160         struct libcfs_ioctl_data *data = arg;
2161         int rc;
2162
2163         switch(cmd) {
2164         case IOC_LIBCFS_GET_INTERFACE: {
2165                 struct ksock_net *net = ni->ni_data;
2166                 struct ksock_interface *iface;
2167                 struct sockaddr_in *sa;
2168
2169                 read_lock(&ksocknal_data.ksnd_global_lock);
2170
2171                 if (data->ioc_count >= (__u32)net->ksnn_ninterfaces) {
2172                         rc = -ENOENT;
2173                 } else {
2174                         rc = 0;
2175                         iface = &net->ksnn_interfaces[data->ioc_count];
2176
2177                         sa = (void *)&iface->ksni_addr;
2178                         if (sa->sin_family == AF_INET)
2179                                 data->ioc_u32[0] = ntohl(sa->sin_addr.s_addr);
2180                         else
2181                                 data->ioc_u32[0] = 0xFFFFFFFF;
2182                         data->ioc_u32[1] = iface->ksni_netmask;
2183                         data->ioc_u32[2] = iface->ksni_npeers;
2184                         data->ioc_u32[3] = iface->ksni_nroutes;
2185                 }
2186
2187                 read_unlock(&ksocknal_data.ksnd_global_lock);
2188                 return rc;
2189         }
2190
2191         case IOC_LIBCFS_ADD_INTERFACE:
2192                 return ksocknal_add_interface(ni,
2193                                               data->ioc_u32[0], /* IP address */
2194                                               data->ioc_u32[1]); /* net mask */
2195
2196         case IOC_LIBCFS_DEL_INTERFACE:
2197                 return ksocknal_del_interface(ni,
2198                                               data->ioc_u32[0]); /* IP address */
2199
2200         case IOC_LIBCFS_GET_PEER: {
2201                 __u32            myip = 0;
2202                 __u32            ip = 0;
2203                 int              port = 0;
2204                 int              conn_count = 0;
2205                 int              share_count = 0;
2206
2207                 rc = ksocknal_get_peer_info(ni, data->ioc_count,
2208                                             &id, &myip, &ip, &port,
2209                                             &conn_count,  &share_count);
2210                 if (rc != 0)
2211                         return rc;
2212
2213                 data->ioc_nid    = id.nid;
2214                 data->ioc_count  = share_count;
2215                 data->ioc_u32[0] = ip;
2216                 data->ioc_u32[1] = port;
2217                 data->ioc_u32[2] = myip;
2218                 data->ioc_u32[3] = conn_count;
2219                 data->ioc_u32[4] = id.pid;
2220                 return 0;
2221         }
2222
2223         case IOC_LIBCFS_ADD_PEER:
2224                 id.nid = data->ioc_nid;
2225                 id.pid = LNET_PID_LUSTRE;
2226                 return ksocknal_add_peer (ni, id,
2227                                           data->ioc_u32[0], /* IP */
2228                                           data->ioc_u32[1]); /* port */
2229
2230         case IOC_LIBCFS_DEL_PEER:
2231                 id.nid = data->ioc_nid;
2232                 id.pid = LNET_PID_ANY;
2233                 return ksocknal_del_peer (ni, id,
2234                                           data->ioc_u32[0]); /* IP */
2235
2236         case IOC_LIBCFS_GET_CONN: {
2237                 int           txmem;
2238                 int           rxmem;
2239                 int           nagle;
2240                 struct ksock_conn *conn = ksocknal_get_conn_by_idx(ni, data->ioc_count);
2241                 struct sockaddr_in *psa = (void *)&conn->ksnc_peeraddr;
2242                 struct sockaddr_in *mysa = (void *)&conn->ksnc_myaddr;
2243
2244                 if (conn == NULL)
2245                         return -ENOENT;
2246
2247                 ksocknal_lib_get_conn_tunables(conn, &txmem, &rxmem, &nagle);
2248
2249                 data->ioc_count  = txmem;
2250                 data->ioc_nid    = conn->ksnc_peer->ksnp_id.nid;
2251                 data->ioc_flags  = nagle;
2252                 if (psa->sin_family == AF_INET)
2253                         data->ioc_u32[0] = ntohl(psa->sin_addr.s_addr);
2254                 else
2255                         data->ioc_u32[0] = 0xFFFFFFFF;
2256                 data->ioc_u32[1] = rpc_get_port((struct sockaddr *)
2257                                                 &conn->ksnc_peeraddr);
2258                 if (mysa->sin_family == AF_INET)
2259                         data->ioc_u32[2] = ntohl(mysa->sin_addr.s_addr);
2260                 else
2261                         data->ioc_u32[2] = 0xFFFFFFFF;
2262                 data->ioc_u32[3] = conn->ksnc_type;
2263                 data->ioc_u32[4] = conn->ksnc_scheduler->kss_cpt;
2264                 data->ioc_u32[5] = rxmem;
2265                 data->ioc_u32[6] = conn->ksnc_peer->ksnp_id.pid;
2266                 ksocknal_conn_decref(conn);
2267                 return 0;
2268         }
2269
2270         case IOC_LIBCFS_CLOSE_CONNECTION:
2271                 id.nid = data->ioc_nid;
2272                 id.pid = LNET_PID_ANY;
2273                 return ksocknal_close_matching_conns (id,
2274                                                       data->ioc_u32[0]);
2275
2276         case IOC_LIBCFS_REGISTER_MYNID:
2277                 /* Ignore if this is a noop */
2278                 if (data->ioc_nid == ni->ni_nid)
2279                         return 0;
2280
2281                 CERROR("obsolete IOC_LIBCFS_REGISTER_MYNID: %s(%s)\n",
2282                        libcfs_nid2str(data->ioc_nid),
2283                        libcfs_nid2str(ni->ni_nid));
2284                 return -EINVAL;
2285
2286         case IOC_LIBCFS_PUSH_CONNECTION:
2287                 id.nid = data->ioc_nid;
2288                 id.pid = LNET_PID_ANY;
2289                 return ksocknal_push(ni, id);
2290
2291         default:
2292                 return -EINVAL;
2293         }
2294         /* not reached */
2295 }
2296
2297 static void
2298 ksocknal_free_buffers (void)
2299 {
2300         LASSERT (atomic_read(&ksocknal_data.ksnd_nactive_txs) == 0);
2301
2302         if (ksocknal_data.ksnd_schedulers != NULL)
2303                 cfs_percpt_free(ksocknal_data.ksnd_schedulers);
2304
2305         spin_lock(&ksocknal_data.ksnd_tx_lock);
2306
2307         if (!list_empty(&ksocknal_data.ksnd_idle_noop_txs)) {
2308                 LIST_HEAD(zlist);
2309                 struct ksock_tx *tx;
2310
2311                 list_splice_init(&ksocknal_data.ksnd_idle_noop_txs, &zlist);
2312                 spin_unlock(&ksocknal_data.ksnd_tx_lock);
2313
2314                 while (!list_empty(&zlist)) {
2315                         tx = list_entry(zlist.next, struct ksock_tx, tx_list);
2316                         list_del(&tx->tx_list);
2317                         LIBCFS_FREE(tx, tx->tx_desc_size);
2318                 }
2319         } else {
2320                 spin_unlock(&ksocknal_data.ksnd_tx_lock);
2321         }
2322 }
2323
2324 static void
2325 ksocknal_base_shutdown(void)
2326 {
2327         struct ksock_sched *sched;
2328         struct ksock_peer_ni *peer_ni;
2329         int i;
2330
2331         CDEBUG(D_MALLOC, "before NAL cleanup: kmem %lld\n",
2332                libcfs_kmem_read());
2333         LASSERT (ksocknal_data.ksnd_nnets == 0);
2334
2335         switch (ksocknal_data.ksnd_init) {
2336         default:
2337                 LASSERT(0);
2338                 /* fallthrough */
2339
2340         case SOCKNAL_INIT_ALL:
2341         case SOCKNAL_INIT_DATA:
2342                 hash_for_each(ksocknal_data.ksnd_peers, i, peer_ni, ksnp_list)
2343                         LASSERT(0);
2344
2345                 LASSERT(list_empty(&ksocknal_data.ksnd_nets));
2346                 LASSERT(list_empty(&ksocknal_data.ksnd_enomem_conns));
2347                 LASSERT(list_empty(&ksocknal_data.ksnd_zombie_conns));
2348                 LASSERT(list_empty(&ksocknal_data.ksnd_connd_connreqs));
2349                 LASSERT(list_empty(&ksocknal_data.ksnd_connd_routes));
2350
2351                 if (ksocknal_data.ksnd_schedulers != NULL) {
2352                         cfs_percpt_for_each(sched, i,
2353                                             ksocknal_data.ksnd_schedulers) {
2354
2355                                 LASSERT(list_empty(&sched->kss_tx_conns));
2356                                 LASSERT(list_empty(&sched->kss_rx_conns));
2357                                 LASSERT(list_empty(&sched->kss_zombie_noop_txs));
2358                                 LASSERT(sched->kss_nconns == 0);
2359                         }
2360                 }
2361
2362                 /* flag threads to terminate; wake and wait for them to die */
2363                 ksocknal_data.ksnd_shuttingdown = 1;
2364                 wake_up_all(&ksocknal_data.ksnd_connd_waitq);
2365                 wake_up_all(&ksocknal_data.ksnd_reaper_waitq);
2366
2367                 if (ksocknal_data.ksnd_schedulers != NULL) {
2368                         cfs_percpt_for_each(sched, i,
2369                                             ksocknal_data.ksnd_schedulers)
2370                                         wake_up_all(&sched->kss_waitq);
2371                 }
2372
2373                 wait_var_event_warning(&ksocknal_data.ksnd_nthreads,
2374                                        atomic_read(&ksocknal_data.ksnd_nthreads) == 0,
2375                                        "waiting for %d threads to terminate\n",
2376                                        atomic_read(&ksocknal_data.ksnd_nthreads));
2377
2378                 ksocknal_free_buffers();
2379
2380                 ksocknal_data.ksnd_init = SOCKNAL_INIT_NOTHING;
2381                 break;
2382         }
2383
2384         CDEBUG(D_MALLOC, "after NAL cleanup: kmem %lld\n",
2385                libcfs_kmem_read());
2386
2387         module_put(THIS_MODULE);
2388 }
2389
2390 static int
2391 ksocknal_base_startup(void)
2392 {
2393         struct ksock_sched *sched;
2394         int rc;
2395         int i;
2396
2397         LASSERT(ksocknal_data.ksnd_init == SOCKNAL_INIT_NOTHING);
2398         LASSERT(ksocknal_data.ksnd_nnets == 0);
2399
2400         memset(&ksocknal_data, 0, sizeof(ksocknal_data)); /* zero pointers */
2401
2402         hash_init(ksocknal_data.ksnd_peers);
2403
2404         rwlock_init(&ksocknal_data.ksnd_global_lock);
2405         INIT_LIST_HEAD(&ksocknal_data.ksnd_nets);
2406
2407         spin_lock_init(&ksocknal_data.ksnd_reaper_lock);
2408         INIT_LIST_HEAD(&ksocknal_data.ksnd_enomem_conns);
2409         INIT_LIST_HEAD(&ksocknal_data.ksnd_zombie_conns);
2410         INIT_LIST_HEAD(&ksocknal_data.ksnd_deathrow_conns);
2411         init_waitqueue_head(&ksocknal_data.ksnd_reaper_waitq);
2412
2413         spin_lock_init(&ksocknal_data.ksnd_connd_lock);
2414         INIT_LIST_HEAD(&ksocknal_data.ksnd_connd_connreqs);
2415         INIT_LIST_HEAD(&ksocknal_data.ksnd_connd_routes);
2416         init_waitqueue_head(&ksocknal_data.ksnd_connd_waitq);
2417
2418         spin_lock_init(&ksocknal_data.ksnd_tx_lock);
2419         INIT_LIST_HEAD(&ksocknal_data.ksnd_idle_noop_txs);
2420
2421         /* NB memset above zeros whole of ksocknal_data */
2422
2423         /* flag lists/ptrs/locks initialised */
2424         ksocknal_data.ksnd_init = SOCKNAL_INIT_DATA;
2425         if (!try_module_get(THIS_MODULE))
2426                 goto failed;
2427
2428         /* Create a scheduler block per available CPT */
2429         ksocknal_data.ksnd_schedulers = cfs_percpt_alloc(lnet_cpt_table(),
2430                                                          sizeof(*sched));
2431         if (ksocknal_data.ksnd_schedulers == NULL)
2432                 goto failed;
2433
2434         cfs_percpt_for_each(sched, i, ksocknal_data.ksnd_schedulers) {
2435                 int nthrs;
2436
2437                 /*
2438                  * make sure not to allocate more threads than there are
2439                  * cores/CPUs in teh CPT
2440                  */
2441                 nthrs = cfs_cpt_weight(lnet_cpt_table(), i);
2442                 if (*ksocknal_tunables.ksnd_nscheds > 0) {
2443                         nthrs = min(nthrs, *ksocknal_tunables.ksnd_nscheds);
2444                 } else {
2445                         /*
2446                          * max to half of CPUs, assume another half should be
2447                          * reserved for upper layer modules
2448                          */
2449                         nthrs = min(max(SOCKNAL_NSCHEDS, nthrs >> 1), nthrs);
2450                 }
2451
2452                 sched->kss_nthreads_max = nthrs;
2453                 sched->kss_cpt = i;
2454
2455                 spin_lock_init(&sched->kss_lock);
2456                 INIT_LIST_HEAD(&sched->kss_rx_conns);
2457                 INIT_LIST_HEAD(&sched->kss_tx_conns);
2458                 INIT_LIST_HEAD(&sched->kss_zombie_noop_txs);
2459                 init_waitqueue_head(&sched->kss_waitq);
2460         }
2461
2462         ksocknal_data.ksnd_connd_starting         = 0;
2463         ksocknal_data.ksnd_connd_failed_stamp     = 0;
2464         ksocknal_data.ksnd_connd_starting_stamp   = ktime_get_real_seconds();
2465         /* must have at least 2 connds to remain responsive to accepts while
2466          * connecting */
2467         if (*ksocknal_tunables.ksnd_nconnds < SOCKNAL_CONND_RESV + 1)
2468                 *ksocknal_tunables.ksnd_nconnds = SOCKNAL_CONND_RESV + 1;
2469
2470         if (*ksocknal_tunables.ksnd_nconnds_max <
2471             *ksocknal_tunables.ksnd_nconnds) {
2472                 ksocknal_tunables.ksnd_nconnds_max =
2473                         ksocknal_tunables.ksnd_nconnds;
2474         }
2475
2476         for (i = 0; i < *ksocknal_tunables.ksnd_nconnds; i++) {
2477                 char name[16];
2478                 spin_lock_bh(&ksocknal_data.ksnd_connd_lock);
2479                 ksocknal_data.ksnd_connd_starting++;
2480                 spin_unlock_bh(&ksocknal_data.ksnd_connd_lock);
2481
2482
2483                 snprintf(name, sizeof(name), "socknal_cd%02d", i);
2484                 rc = ksocknal_thread_start(ksocknal_connd,
2485                                            (void *)((uintptr_t)i), name);
2486                 if (rc != 0) {
2487                         spin_lock_bh(&ksocknal_data.ksnd_connd_lock);
2488                         ksocknal_data.ksnd_connd_starting--;
2489                         spin_unlock_bh(&ksocknal_data.ksnd_connd_lock);
2490                         CERROR("Can't spawn socknal connd: %d\n", rc);
2491                         goto failed;
2492                 }
2493         }
2494
2495         rc = ksocknal_thread_start(ksocknal_reaper, NULL, "socknal_reaper");
2496         if (rc != 0) {
2497                 CERROR ("Can't spawn socknal reaper: %d\n", rc);
2498                 goto failed;
2499         }
2500
2501         /* flag everything initialised */
2502         ksocknal_data.ksnd_init = SOCKNAL_INIT_ALL;
2503
2504         return 0;
2505
2506  failed:
2507         ksocknal_base_shutdown();
2508         return -ENETDOWN;
2509 }
2510
2511 static int
2512 ksocknal_debug_peerhash(struct lnet_ni *ni)
2513 {
2514         struct ksock_peer_ni *peer_ni;
2515         int i;
2516
2517         read_lock(&ksocknal_data.ksnd_global_lock);
2518
2519         hash_for_each(ksocknal_data.ksnd_peers, i, peer_ni, ksnp_list) {
2520                 struct ksock_route *route;
2521                 struct ksock_conn *conn;
2522
2523                 if (peer_ni->ksnp_ni != ni)
2524                         continue;
2525
2526                 CWARN("Active peer_ni on shutdown: %s, ref %d, "
2527                       "closing %d, accepting %d, err %d, zcookie %llu, "
2528                       "txq %d, zc_req %d\n", libcfs_id2str(peer_ni->ksnp_id),
2529                       refcount_read(&peer_ni->ksnp_refcount),
2530                       peer_ni->ksnp_closing,
2531                       peer_ni->ksnp_accepting, peer_ni->ksnp_error,
2532                       peer_ni->ksnp_zc_next_cookie,
2533                       !list_empty(&peer_ni->ksnp_tx_queue),
2534                       !list_empty(&peer_ni->ksnp_zc_req_list));
2535
2536                 list_for_each_entry(route, &peer_ni->ksnp_routes, ksnr_list) {
2537                         CWARN("Route: ref %d, schd %d, conn %d, cnted %d, del %d\n",
2538                               refcount_read(&route->ksnr_refcount),
2539                               route->ksnr_scheduled, route->ksnr_connecting,
2540                               route->ksnr_connected, route->ksnr_deleted);
2541                 }
2542
2543                 list_for_each_entry(conn, &peer_ni->ksnp_conns, ksnc_list) {
2544                         CWARN("Conn: ref %d, sref %d, t %d, c %d\n",
2545                               refcount_read(&conn->ksnc_conn_refcount),
2546                               refcount_read(&conn->ksnc_sock_refcount),
2547                               conn->ksnc_type, conn->ksnc_closing);
2548                 }
2549                 break;
2550         }
2551
2552         read_unlock(&ksocknal_data.ksnd_global_lock);
2553         return 0;
2554 }
2555
2556 void
2557 ksocknal_shutdown(struct lnet_ni *ni)
2558 {
2559         struct ksock_net *net = ni->ni_data;
2560         struct lnet_process_id anyid = {
2561                 .nid = LNET_NID_ANY,
2562                 .pid = LNET_PID_ANY,
2563         };
2564         int i;
2565
2566         LASSERT(ksocknal_data.ksnd_init == SOCKNAL_INIT_ALL);
2567         LASSERT(ksocknal_data.ksnd_nnets > 0);
2568
2569         /* prevent new peers */
2570         atomic_add(SOCKNAL_SHUTDOWN_BIAS, &net->ksnn_npeers);
2571
2572         /* Delete all peers */
2573         ksocknal_del_peer(ni, anyid, 0);
2574
2575         /* Wait for all peer_ni state to clean up */
2576         wait_var_event_warning(&net->ksnn_npeers,
2577                                atomic_read(&net->ksnn_npeers) ==
2578                                SOCKNAL_SHUTDOWN_BIAS,
2579                                "waiting for %d peers to disconnect\n",
2580                                ksocknal_debug_peerhash(ni) +
2581                                atomic_read(&net->ksnn_npeers) -
2582                                SOCKNAL_SHUTDOWN_BIAS);
2583
2584         for (i = 0; i < net->ksnn_ninterfaces; i++) {
2585                 LASSERT(net->ksnn_interfaces[i].ksni_npeers == 0);
2586                 LASSERT(net->ksnn_interfaces[i].ksni_nroutes == 0);
2587         }
2588
2589         list_del(&net->ksnn_list);
2590         LIBCFS_FREE(net, sizeof(*net));
2591
2592         ksocknal_data.ksnd_nnets--;
2593         if (ksocknal_data.ksnd_nnets == 0)
2594                 ksocknal_base_shutdown();
2595 }
2596
2597 static int
2598 ksocknal_search_new_ipif(struct ksock_net *net)
2599 {
2600         int new_ipif = 0;
2601         int i;
2602
2603         for (i = 0; i < net->ksnn_ninterfaces; i++) {
2604                 char *ifnam = &net->ksnn_interfaces[i].ksni_name[0];
2605                 char *colon = strchr(ifnam, ':');
2606                 int found  = 0;
2607                 struct ksock_net *tmp;
2608                 int j;
2609
2610                 if (colon != NULL) /* ignore alias device */
2611                         *colon = 0;
2612
2613                 list_for_each_entry(tmp, &ksocknal_data.ksnd_nets,
2614                                         ksnn_list) {
2615                         for (j = 0; !found && j < tmp->ksnn_ninterfaces; j++) {
2616                                 char *ifnam2 = &tmp->ksnn_interfaces[j].\
2617                                              ksni_name[0];
2618                                 char *colon2 = strchr(ifnam2, ':');
2619
2620                                 if (colon2 != NULL)
2621                                         *colon2 = 0;
2622
2623                                 found = strcmp(ifnam, ifnam2) == 0;
2624                                 if (colon2 != NULL)
2625                                         *colon2 = ':';
2626                         }
2627                         if (found)
2628                                 break;
2629                 }
2630
2631                 new_ipif += !found;
2632                 if (colon != NULL)
2633                         *colon = ':';
2634         }
2635
2636         return new_ipif;
2637 }
2638
2639 static int
2640 ksocknal_start_schedulers(struct ksock_sched *sched)
2641 {
2642         int     nthrs;
2643         int     rc = 0;
2644         int     i;
2645
2646         if (sched->kss_nthreads == 0) {
2647                 if (*ksocknal_tunables.ksnd_nscheds > 0) {
2648                         nthrs = sched->kss_nthreads_max;
2649                 } else {
2650                         nthrs = cfs_cpt_weight(lnet_cpt_table(),
2651                                                sched->kss_cpt);
2652                         nthrs = min(max(SOCKNAL_NSCHEDS, nthrs >> 1), nthrs);
2653                         nthrs = min(SOCKNAL_NSCHEDS_HIGH, nthrs);
2654                 }
2655                 nthrs = min(nthrs, sched->kss_nthreads_max);
2656         } else {
2657                 LASSERT(sched->kss_nthreads <= sched->kss_nthreads_max);
2658                 /* increase two threads if there is new interface */
2659                 nthrs = min(2, sched->kss_nthreads_max - sched->kss_nthreads);
2660         }
2661
2662         for (i = 0; i < nthrs; i++) {
2663                 long id;
2664                 char name[20];
2665
2666                 id = KSOCK_THREAD_ID(sched->kss_cpt, sched->kss_nthreads + i);
2667                 snprintf(name, sizeof(name), "socknal_sd%02d_%02d",
2668                          sched->kss_cpt, (int)KSOCK_THREAD_SID(id));
2669
2670                 rc = ksocknal_thread_start(ksocknal_scheduler,
2671                                            (void *)id, name);
2672                 if (rc == 0)
2673                         continue;
2674
2675                 CERROR("Can't spawn thread %d for scheduler[%d]: %d\n",
2676                        sched->kss_cpt, (int) KSOCK_THREAD_SID(id), rc);
2677                 break;
2678         }
2679
2680         sched->kss_nthreads += i;
2681         return rc;
2682 }
2683
2684 static int
2685 ksocknal_net_start_threads(struct ksock_net *net, __u32 *cpts, int ncpts)
2686 {
2687         int newif = ksocknal_search_new_ipif(net);
2688         int rc;
2689         int i;
2690
2691         if (ncpts > 0 && ncpts > cfs_cpt_number(lnet_cpt_table()))
2692                 return -EINVAL;
2693
2694         for (i = 0; i < ncpts; i++) {
2695                 struct ksock_sched *sched;
2696                 int cpt = (cpts == NULL) ? i : cpts[i];
2697
2698                 LASSERT(cpt < cfs_cpt_number(lnet_cpt_table()));
2699                 sched = ksocknal_data.ksnd_schedulers[cpt];
2700
2701                 if (!newif && sched->kss_nthreads > 0)
2702                         continue;
2703
2704                 rc = ksocknal_start_schedulers(sched);
2705                 if (rc != 0)
2706                         return rc;
2707         }
2708         return 0;
2709 }
2710
2711 int
2712 ksocknal_startup(struct lnet_ni *ni)
2713 {
2714         struct ksock_net *net;
2715         struct lnet_ioctl_config_lnd_cmn_tunables *net_tunables;
2716         struct ksock_interface *ksi = NULL;
2717         struct lnet_inetdev *ifaces = NULL;
2718         int i = 0;
2719         int rc;
2720
2721         LASSERT (ni->ni_net->net_lnd == &the_ksocklnd);
2722
2723         if (ksocknal_data.ksnd_init == SOCKNAL_INIT_NOTHING) {
2724                 rc = ksocknal_base_startup();
2725                 if (rc != 0)
2726                         return rc;
2727         }
2728
2729         LIBCFS_ALLOC(net, sizeof(*net));
2730         if (net == NULL)
2731                 goto fail_0;
2732
2733         net->ksnn_incarnation = ktime_get_real_ns();
2734         ni->ni_data = net;
2735         net_tunables = &ni->ni_net->net_tunables;
2736
2737         if (net_tunables->lct_peer_timeout == -1)
2738                 net_tunables->lct_peer_timeout =
2739                         *ksocknal_tunables.ksnd_peertimeout;
2740
2741         if (net_tunables->lct_max_tx_credits == -1)
2742                 net_tunables->lct_max_tx_credits =
2743                         *ksocknal_tunables.ksnd_credits;
2744
2745         if (net_tunables->lct_peer_tx_credits == -1)
2746                 net_tunables->lct_peer_tx_credits =
2747                         *ksocknal_tunables.ksnd_peertxcredits;
2748
2749         if (net_tunables->lct_peer_tx_credits >
2750             net_tunables->lct_max_tx_credits)
2751                 net_tunables->lct_peer_tx_credits =
2752                         net_tunables->lct_max_tx_credits;
2753
2754         if (net_tunables->lct_peer_rtr_credits == -1)
2755                 net_tunables->lct_peer_rtr_credits =
2756                         *ksocknal_tunables.ksnd_peerrtrcredits;
2757
2758         rc = lnet_inet_enumerate(&ifaces, ni->ni_net_ns);
2759         if (rc < 0)
2760                 goto fail_1;
2761
2762         if (!ni->ni_interfaces[0]) {
2763                 struct sockaddr_in *sa;
2764
2765                 ksi = &net->ksnn_interfaces[0];
2766                 sa = (void *)&ksi->ksni_addr;
2767
2768                 /* Use the first discovered interface */
2769                 net->ksnn_ninterfaces = 1;
2770                 ni->ni_dev_cpt = ifaces[0].li_cpt;
2771                 memset(sa, 0, sizeof(*sa));
2772                 sa->sin_family = AF_INET;
2773                 sa->sin_addr.s_addr = htonl(ifaces[0].li_ipaddr);
2774                 ksi->ksni_index = ksocknal_ip2index((struct sockaddr *)sa, ni);
2775                 ksi->ksni_netmask = ifaces[0].li_netmask;
2776                 strlcpy(ksi->ksni_name, ifaces[0].li_name,
2777                         sizeof(ksi->ksni_name));
2778         } else {
2779                 /* Before Multi-Rail ksocklnd would manage
2780                  * multiple interfaces with its own tcp bonding.
2781                  * If we encounter an old configuration using
2782                  * this tcp bonding approach then we need to
2783                  * handle more than one ni_interfaces.
2784                  *
2785                  * In Multi-Rail configuration only ONE ni_interface
2786                  * should exist. Each IP alias should be mapped to
2787                  * each 'struct net_ni'.
2788                  */
2789                 for (i = 0; i < LNET_INTERFACES_NUM; i++) {
2790                         int j;
2791
2792                         if (!ni->ni_interfaces[i])
2793                                 break;
2794
2795                         for (j = 0; j < LNET_INTERFACES_NUM;  j++) {
2796                                 if (i != j && ni->ni_interfaces[j] &&
2797                                     strcmp(ni->ni_interfaces[i],
2798                                            ni->ni_interfaces[j]) == 0) {
2799                                         rc = -EEXIST;
2800                                         CERROR("ksocklnd: found duplicate %s at %d and %d, rc = %d\n",
2801                                                ni->ni_interfaces[i], i, j, rc);
2802                                         goto fail_1;
2803                                 }
2804                         }
2805
2806                         for (j = 0; j < rc; j++) {
2807                                 struct sockaddr_in *sa;
2808
2809                                 if (strcmp(ifaces[j].li_name,
2810                                            ni->ni_interfaces[i]) != 0)
2811                                         continue;
2812
2813                                 ksi =
2814                                   &net->ksnn_interfaces[net->ksnn_ninterfaces];
2815                                 sa = (void *)&ksi->ksni_addr;
2816                                 ni->ni_dev_cpt = ifaces[j].li_cpt;
2817                                 memset(sa, 0, sizeof(*sa));
2818                                 sa->sin_family = AF_INET;
2819                                 sa->sin_addr.s_addr =
2820                                         htonl(ifaces[j].li_ipaddr);
2821                                 ksi->ksni_index = ksocknal_ip2index(
2822                                         (struct sockaddr *)sa, ni);
2823                                 ksi->ksni_netmask = ifaces[j].li_netmask;
2824                                 strlcpy(ksi->ksni_name, ifaces[j].li_name,
2825                                         sizeof(ksi->ksni_name));
2826                                 net->ksnn_ninterfaces++;
2827                                 break;
2828                         }
2829                 }
2830                 /* ni_interfaces don't map to all network interfaces */
2831                 if (!ksi || net->ksnn_ninterfaces != i) {
2832                         CERROR("ksocklnd: requested %d but only %d interfaces found\n",
2833                                i, net->ksnn_ninterfaces);
2834                         goto fail_1;
2835                 }
2836         }
2837
2838         /* call it before add it to ksocknal_data.ksnd_nets */
2839         rc = ksocknal_net_start_threads(net, ni->ni_cpts, ni->ni_ncpts);
2840         if (rc != 0)
2841                 goto fail_1;
2842
2843         LASSERT(ksi);
2844         LASSERT(ksi->ksni_addr.ss_family == AF_INET);
2845         ni->ni_nid = LNET_MKNID(
2846                 LNET_NIDNET(ni->ni_nid),
2847                 ntohl(((struct sockaddr_in *)
2848                        &ksi->ksni_addr)->sin_addr.s_addr));
2849         list_add(&net->ksnn_list, &ksocknal_data.ksnd_nets);
2850
2851         ksocknal_data.ksnd_nnets++;
2852
2853         return 0;
2854
2855 fail_1:
2856         LIBCFS_FREE(net, sizeof(*net));
2857 fail_0:
2858         if (ksocknal_data.ksnd_nnets == 0)
2859                 ksocknal_base_shutdown();
2860
2861         return -ENETDOWN;
2862 }
2863
2864
2865 static void __exit ksocklnd_exit(void)
2866 {
2867         lnet_unregister_lnd(&the_ksocklnd);
2868 }
2869
2870 static const struct lnet_lnd the_ksocklnd = {
2871         .lnd_type               = SOCKLND,
2872         .lnd_startup            = ksocknal_startup,
2873         .lnd_shutdown           = ksocknal_shutdown,
2874         .lnd_ctl                = ksocknal_ctl,
2875         .lnd_send               = ksocknal_send,
2876         .lnd_recv               = ksocknal_recv,
2877         .lnd_notify_peer_down   = ksocknal_notify_gw_down,
2878         .lnd_accept             = ksocknal_accept,
2879 };
2880
2881 static int __init ksocklnd_init(void)
2882 {
2883         int rc;
2884
2885         /* check ksnr_connected/connecting field large enough */
2886         BUILD_BUG_ON(SOCKLND_CONN_NTYPES > 4);
2887         BUILD_BUG_ON(SOCKLND_CONN_ACK != SOCKLND_CONN_BULK_IN);
2888
2889         rc = ksocknal_tunables_init();
2890         if (rc != 0)
2891                 return rc;
2892
2893         lnet_register_lnd(&the_ksocklnd);
2894
2895         return 0;
2896 }
2897
2898 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
2899 MODULE_DESCRIPTION("TCP Socket LNet Network Driver");
2900 MODULE_VERSION("2.8.0");
2901 MODULE_LICENSE("GPL");
2902
2903 module_init(ksocklnd_init);
2904 module_exit(ksocklnd_exit);