drivers/infiniband/core/cma.c

   1 /*
   2  * Copyright (c) 2005 Voltaire Inc.  All rights reserved.
   3  * Copyright (c) 2002-2005, Network Appliance, Inc. All rights reserved.
   4  * Copyright (c) 1999-2005, Mellanox Technologies, Inc. All rights reserved.
   5  * Copyright (c) 2005-2006 Intel Corporation.  All rights reserved.
   6  *
   7  * This software is available to you under a choice of one of two
   8  * licenses.  You may choose to be licensed under the terms of the GNU
   9  * General Public License (GPL) Version 2, available from the file
  10  * COPYING in the main directory of this source tree, or the
  11  * OpenIB.org BSD license below:
  12  *
  13  *     Redistribution and use in source and binary forms, with or
  14  *     without modification, are permitted provided that the following
  15  *     conditions are met:
  16  *
  17  *      - Redistributions of source code must retain the above
  18  *        copyright notice, this list of conditions and the following
  19  *        disclaimer.
  20  *
  21  *      - Redistributions in binary form must reproduce the above
  22  *        copyright notice, this list of conditions and the following
  23  *        disclaimer in the documentation and/or other materials
  24  *        provided with the distribution.
  25  *
  26  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  27  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  28  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  29  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  30  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  31  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  32  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  33  * SOFTWARE.
  34  */
  35
  36 #include <linux/completion.h>
  37 #include <linux/in.h>
  38 #include <linux/in6.h>
  39 #include <linux/mutex.h>
  40 #include <linux/random.h>
  41 #include <linux/igmp.h>
  42 #include <linux/idr.h>
  43 #include <linux/inetdevice.h>
  44 #include <linux/slab.h>
  45 #include <linux/module.h>
  46 #include <net/route.h>
  47
  48 #include <net/net_namespace.h>
  49 #include <net/netns/generic.h>
  50 #include <net/tcp.h>
  51 #include <net/ipv6.h>
  52 #include <net/ip_fib.h>
  53 #include <net/ip6_route.h>
  54
  55 #include <rdma/rdma_cm.h>
  56 #include <rdma/rdma_cm_ib.h>
  57 #include <rdma/rdma_netlink.h>
  58 #include <rdma/ib.h>
  59 #include <rdma/ib_cache.h>
  60 #include <rdma/ib_cm.h>
  61 #include <rdma/ib_sa.h>
  62 #include <rdma/iw_cm.h>
  63
  64 #include "core_priv.h"
  65
  66 MODULE_AUTHOR("Sean Hefty");
  67 MODULE_DESCRIPTION("Generic RDMA CM Agent");
  68 MODULE_LICENSE("Dual BSD/GPL");
  69
  70 #define CMA_CM_RESPONSE_TIMEOUT 20
  71 #define CMA_MAX_CM_RETRIES 15
  72 #define CMA_CM_MRA_SETTING (IB_CM_MRA_FLAG_DELAY | 24)
  73 #define CMA_IBOE_PACKET_LIFETIME 18
  74
  75 static const char * const cma_events[] = {
  76         [RDMA_CM_EVENT_ADDR_RESOLVED]    = "address resolved",
  77         [RDMA_CM_EVENT_ADDR_ERROR]       = "address error",
  78         [RDMA_CM_EVENT_ROUTE_RESOLVED]   = "route resolved ",
  79         [RDMA_CM_EVENT_ROUTE_ERROR]      = "route error",
  80         [RDMA_CM_EVENT_CONNECT_REQUEST]  = "connect request",
  81         [RDMA_CM_EVENT_CONNECT_RESPONSE] = "connect response",
  82         [RDMA_CM_EVENT_CONNECT_ERROR]    = "connect error",
  83         [RDMA_CM_EVENT_UNREACHABLE]      = "unreachable",
  84         [RDMA_CM_EVENT_REJECTED]         = "rejected",
  85         [RDMA_CM_EVENT_ESTABLISHED]      = "established",
  86         [RDMA_CM_EVENT_DISCONNECTED]     = "disconnected",
  87         [RDMA_CM_EVENT_DEVICE_REMOVAL]   = "device removal",
  88         [RDMA_CM_EVENT_MULTICAST_JOIN]   = "multicast join",
  89         [RDMA_CM_EVENT_MULTICAST_ERROR]  = "multicast error",
  90         [RDMA_CM_EVENT_ADDR_CHANGE]      = "address change",
  91         [RDMA_CM_EVENT_TIMEWAIT_EXIT]    = "timewait exit",
  92 };
  93
  94 const char *__attribute_const__ rdma_event_msg(enum rdma_cm_event_type event)
  95 {
  96         size_t index = event;
  97
  98         return (index < ARRAY_SIZE(cma_events) && cma_events[index]) ?
  99                         cma_events[index] : "unrecognized event";
 100 }
 101 EXPORT_SYMBOL(rdma_event_msg);
 102
 103 static void cma_add_one(struct ib_device *device);
 104 static void cma_remove_one(struct ib_device *device, void *client_data);
 105
 106 static struct ib_client cma_client = {
 107         .name   = "cma",
 108         .add    = cma_add_one,
 109         .remove = cma_remove_one
 110 };
 111
 112 static struct ib_sa_client sa_client;
 113 static struct rdma_addr_client addr_client;
 114 static LIST_HEAD(dev_list);
 115 static LIST_HEAD(listen_any_list);
 116 static DEFINE_MUTEX(lock);
 117 static struct workqueue_struct *cma_wq;
 118 static int cma_pernet_id;
 119
 120 struct cma_pernet {
 121         struct idr tcp_ps;
 122         struct idr udp_ps;
 123         struct idr ipoib_ps;
 124         struct idr ib_ps;
 125 };
 126
 127 static struct cma_pernet *cma_pernet(struct net *net)
 128 {
 129         return net_generic(net, cma_pernet_id);
 130 }
 131
 132 static struct idr *cma_pernet_idr(struct net *net, enum rdma_port_space ps)
 133 {
 134         struct cma_pernet *pernet = cma_pernet(net);
 135
 136         switch (ps) {
 137         case RDMA_PS_TCP:
 138                 return &pernet->tcp_ps;
 139         case RDMA_PS_UDP:
 140                 return &pernet->udp_ps;
 141         case RDMA_PS_IPOIB:
 142                 return &pernet->ipoib_ps;
 143         case RDMA_PS_IB:
 144                 return &pernet->ib_ps;
 145         default:
 146                 return NULL;
 147         }
 148 }
 149
 150 struct cma_device {
 151         struct list_head        list;
 152         struct ib_device        *device;
 153         struct completion       comp;
 154         atomic_t                refcount;
 155         struct list_head        id_list;
 156         enum ib_gid_type        *default_gid_type;
 157 };
 158
 159 struct rdma_bind_list {
 160         enum rdma_port_space    ps;
 161         struct hlist_head       owners;
 162         unsigned short          port;
 163 };
 164
 165 static int cma_ps_alloc(struct net *net, enum rdma_port_space ps,
 166                         struct rdma_bind_list *bind_list, int snum)
 167 {
 168         struct idr *idr = cma_pernet_idr(net, ps);
 169
 170         return idr_alloc(idr, bind_list, snum, snum + 1, GFP_KERNEL);
 171 }
 172
 173 static struct rdma_bind_list *cma_ps_find(struct net *net,
 174                                           enum rdma_port_space ps, int snum)
 175 {
 176         struct idr *idr = cma_pernet_idr(net, ps);
 177
 178         return idr_find(idr, snum);
 179 }
 180
 181 static void cma_ps_remove(struct net *net, enum rdma_port_space ps, int snum)
 182 {
 183         struct idr *idr = cma_pernet_idr(net, ps);
 184
 185         idr_remove(idr, snum);
 186 }
 187
 188 enum {
 189         CMA_OPTION_AFONLY,
 190 };
 191
 192 void cma_ref_dev(struct cma_device *cma_dev)
 193 {
 194         atomic_inc(&cma_dev->refcount);
 195 }
 196
 197 struct cma_device *cma_enum_devices_by_ibdev(cma_device_filter  filter,
 198                                              void               *cookie)
 199 {
 200         struct cma_device *cma_dev;
 201         struct cma_device *found_cma_dev = NULL;
 202
 203         mutex_lock(&lock);
 204
 205         list_for_each_entry(cma_dev, &dev_list, list)
 206                 if (filter(cma_dev->device, cookie)) {
 207                         found_cma_dev = cma_dev;
 208                         break;
 209                 }
 210
 211         if (found_cma_dev)
 212                 cma_ref_dev(found_cma_dev);
 213         mutex_unlock(&lock);
 214         return found_cma_dev;
 215 }
 216
 217 int cma_get_default_gid_type(struct cma_device *cma_dev,
 218                              unsigned int port)
 219 {
 220         if (port < rdma_start_port(cma_dev->device) ||
 221             port > rdma_end_port(cma_dev->device))
 222                 return -EINVAL;
 223
 224         return cma_dev->default_gid_type[port - rdma_start_port(cma_dev->device)];
 225 }
 226
 227 int cma_set_default_gid_type(struct cma_device *cma_dev,
 228                              unsigned int port,
 229                              enum ib_gid_type default_gid_type)
 230 {
 231         unsigned long supported_gids;
 232
 233         if (port < rdma_start_port(cma_dev->device) ||
 234             port > rdma_end_port(cma_dev->device))
 235                 return -EINVAL;
 236
 237         supported_gids = roce_gid_type_mask_support(cma_dev->device, port);
 238
 239         if (!(supported_gids & 1 << default_gid_type))
 240                 return -EINVAL;
 241
 242         cma_dev->default_gid_type[port - rdma_start_port(cma_dev->device)] =
 243                 default_gid_type;
 244
 245         return 0;
 246 }
 247
 248 struct ib_device *cma_get_ib_dev(struct cma_device *cma_dev)
 249 {
 250         return cma_dev->device;
 251 }
 252
 253 /*
 254  * Device removal can occur at anytime, so we need extra handling to
 255  * serialize notifying the user of device removal with other callbacks.
 256  * We do this by disabling removal notification while a callback is in process,
 257  * and reporting it after the callback completes.
 258  */
 259 struct rdma_id_private {
 260         struct rdma_cm_id       id;
 261
 262         struct rdma_bind_list   *bind_list;
 263         struct hlist_node       node;
 264         struct list_head        list; /* listen_any_list or cma_device.list */
 265         struct list_head        listen_list; /* per device listens */
 266         struct cma_device       *cma_dev;
 267         struct list_head        mc_list;
 268
 269         int                     internal_id;
 270         enum rdma_cm_state      state;
 271         spinlock_t              lock;
 272         struct mutex            qp_mutex;
 273
 274         struct completion       comp;
 275         atomic_t                refcount;
 276         struct mutex            handler_mutex;
 277
 278         int                     backlog;
 279         int                     timeout_ms;
 280         struct ib_sa_query      *query;
 281         int                     query_id;
 282         union {
 283                 struct ib_cm_id *ib;
 284                 struct iw_cm_id *iw;
 285         } cm_id;
 286
 287         u32                     seq_num;
 288         u32                     qkey;
 289         u32                     qp_num;
 290         pid_t                   owner;
 291         u32                     options;
 292         u8                      srq;
 293         u8                      tos;
 294         u8                      reuseaddr;
 295         u8                      afonly;
 296         enum ib_gid_type        gid_type;
 297 };
 298
 299 struct cma_multicast {
 300         struct rdma_id_private *id_priv;
 301         union {
 302                 struct ib_sa_multicast *ib;
 303         } multicast;
 304         struct list_head        list;
 305         void                    *context;
 306         struct sockaddr_storage addr;
 307         struct kref             mcref;
 308         bool                    igmp_joined;
 309 };
 310
 311 struct cma_work {
 312         struct work_struct      work;
 313         struct rdma_id_private  *id;
 314         enum rdma_cm_state      old_state;
 315         enum rdma_cm_state      new_state;
 316         struct rdma_cm_event    event;
 317 };
 318
 319 struct cma_ndev_work {
 320         struct work_struct      work;
 321         struct rdma_id_private  *id;
 322         struct rdma_cm_event    event;
 323 };
 324
 325 struct iboe_mcast_work {
 326         struct work_struct       work;
 327         struct rdma_id_private  *id;
 328         struct cma_multicast    *mc;
 329 };
 330
 331 union cma_ip_addr {
 332         struct in6_addr ip6;
 333         struct {
 334                 __be32 pad[3];
 335                 __be32 addr;
 336         } ip4;
 337 };
 338
 339 struct cma_hdr {
 340         u8 cma_version;
 341         u8 ip_version;  /* IP version: 7:4 */
 342         __be16 port;
 343         union cma_ip_addr src_addr;
 344         union cma_ip_addr dst_addr;
 345 };
 346
 347 #define CMA_VERSION 0x00
 348
 349 struct cma_req_info {
 350         struct ib_device *device;
 351         int port;
 352         union ib_gid local_gid;
 353         __be64 service_id;
 354         u16 pkey;
 355         bool has_gid:1;
 356 };
 357
 358 static int cma_comp(struct rdma_id_private *id_priv, enum rdma_cm_state comp)
 359 {
 360         unsigned long flags;
 361         int ret;
 362
 363         spin_lock_irqsave(&id_priv->lock, flags);
 364         ret = (id_priv->state == comp);
 365         spin_unlock_irqrestore(&id_priv->lock, flags);
 366         return ret;
 367 }
 368
 369 static int cma_comp_exch(struct rdma_id_private *id_priv,
 370                          enum rdma_cm_state comp, enum rdma_cm_state exch)
 371 {
 372         unsigned long flags;
 373         int ret;
 374
 375         spin_lock_irqsave(&id_priv->lock, flags);
 376         if ((ret = (id_priv->state == comp)))
 377                 id_priv->state = exch;
 378         spin_unlock_irqrestore(&id_priv->lock, flags);
 379         return ret;
 380 }
 381
 382 static enum rdma_cm_state cma_exch(struct rdma_id_private *id_priv,
 383                                    enum rdma_cm_state exch)
 384 {
 385         unsigned long flags;
 386         enum rdma_cm_state old;
 387
 388         spin_lock_irqsave(&id_priv->lock, flags);
 389         old = id_priv->state;
 390         id_priv->state = exch;
 391         spin_unlock_irqrestore(&id_priv->lock, flags);
 392         return old;
 393 }
 394
 395 static inline u8 cma_get_ip_ver(const struct cma_hdr *hdr)
 396 {
 397         return hdr->ip_version >> 4;
 398 }
 399
 400 static inline void cma_set_ip_ver(struct cma_hdr *hdr, u8 ip_ver)
 401 {
 402         hdr->ip_version = (ip_ver << 4) | (hdr->ip_version & 0xF);
 403 }
 404
 405 static int cma_igmp_send(struct net_device *ndev, union ib_gid *mgid, bool join)
 406 {
 407         struct in_device *in_dev = NULL;
 408
 409         if (ndev) {
 410                 rtnl_lock();
 411                 in_dev = __in_dev_get_rtnl(ndev);
 412                 if (in_dev) {
 413                         if (join)
 414                                 ip_mc_inc_group(in_dev,
 415                                                 *(__be32 *)(mgid->raw + 12));
 416                         else
 417                                 ip_mc_dec_group(in_dev,
 418                                                 *(__be32 *)(mgid->raw + 12));
 419                 }
 420                 rtnl_unlock();
 421         }
 422         return (in_dev) ? 0 : -ENODEV;
 423 }
 424
 425 static void _cma_attach_to_dev(struct rdma_id_private *id_priv,
 426                                struct cma_device *cma_dev)
 427 {
 428         cma_ref_dev(cma_dev);
 429         id_priv->cma_dev = cma_dev;
 430         id_priv->gid_type = 0;
 431         id_priv->id.device = cma_dev->device;
 432         id_priv->id.route.addr.dev_addr.transport =
 433                 rdma_node_get_transport(cma_dev->device->node_type);
 434         list_add_tail(&id_priv->list, &cma_dev->id_list);
 435 }
 436
 437 static void cma_attach_to_dev(struct rdma_id_private *id_priv,
 438                               struct cma_device *cma_dev)
 439 {
 440         _cma_attach_to_dev(id_priv, cma_dev);
 441         id_priv->gid_type =
 442                 cma_dev->default_gid_type[id_priv->id.port_num -
 443                                           rdma_start_port(cma_dev->device)];
 444 }
 445
 446 void cma_deref_dev(struct cma_device *cma_dev)
 447 {
 448         if (atomic_dec_and_test(&cma_dev->refcount))
 449                 complete(&cma_dev->comp);
 450 }
 451
 452 static inline void release_mc(struct kref *kref)
 453 {
 454         struct cma_multicast *mc = container_of(kref, struct cma_multicast, mcref);
 455
 456         kfree(mc->multicast.ib);
 457         kfree(mc);
 458 }
 459
 460 static void cma_release_dev(struct rdma_id_private *id_priv)
 461 {
 462         mutex_lock(&lock);
 463         list_del(&id_priv->list);
 464         cma_deref_dev(id_priv->cma_dev);
 465         id_priv->cma_dev = NULL;
 466         mutex_unlock(&lock);
 467 }
 468
 469 static inline struct sockaddr *cma_src_addr(struct rdma_id_private *id_priv)
 470 {
 471         return (struct sockaddr *) &id_priv->id.route.addr.src_addr;
 472 }
 473
 474 static inline struct sockaddr *cma_dst_addr(struct rdma_id_private *id_priv)
 475 {
 476         return (struct sockaddr *) &id_priv->id.route.addr.dst_addr;
 477 }
 478
 479 static inline unsigned short cma_family(struct rdma_id_private *id_priv)
 480 {
 481         return id_priv->id.route.addr.src_addr.ss_family;
 482 }
 483
 484 static int cma_set_qkey(struct rdma_id_private *id_priv, u32 qkey)
 485 {
 486         struct ib_sa_mcmember_rec rec;
 487         int ret = 0;
 488
 489         if (id_priv->qkey) {
 490                 if (qkey && id_priv->qkey != qkey)
 491                         return -EINVAL;
 492                 return 0;
 493         }
 494
 495         if (qkey) {
 496                 id_priv->qkey = qkey;
 497                 return 0;
 498         }
 499
 500         switch (id_priv->id.ps) {
 501         case RDMA_PS_UDP:
 502         case RDMA_PS_IB:
 503                 id_priv->qkey = RDMA_UDP_QKEY;
 504                 break;
 505         case RDMA_PS_IPOIB:
 506                 ib_addr_get_mgid(&id_priv->id.route.addr.dev_addr, &rec.mgid);
 507                 ret = ib_sa_get_mcmember_rec(id_priv->id.device,
 508                                              id_priv->id.port_num, &rec.mgid,
 509                                              &rec);
 510                 if (!ret)
 511                         id_priv->qkey = be32_to_cpu(rec.qkey);
 512                 break;
 513         default:
 514                 break;
 515         }
 516         return ret;
 517 }
 518
 519 static void cma_translate_ib(struct sockaddr_ib *sib, struct rdma_dev_addr *dev_addr)
 520 {
 521         dev_addr->dev_type = ARPHRD_INFINIBAND;
 522         rdma_addr_set_sgid(dev_addr, (union ib_gid *) &sib->sib_addr);
 523         ib_addr_set_pkey(dev_addr, ntohs(sib->sib_pkey));
 524 }
 525
 526 static int cma_translate_addr(struct sockaddr *addr, struct rdma_dev_addr *dev_addr)
 527 {
 528         int ret;
 529
 530         if (addr->sa_family != AF_IB) {
 531                 ret = rdma_translate_ip(addr, dev_addr, NULL);
 532         } else {
 533                 cma_translate_ib((struct sockaddr_ib *) addr, dev_addr);
 534                 ret = 0;
 535         }
 536
 537         return ret;
 538 }
 539
 540 static inline int cma_validate_port(struct ib_device *device, u8 port,
 541                                     enum ib_gid_type gid_type,
 542                                       union ib_gid *gid, int dev_type,
 543                                       int bound_if_index)
 544 {
 545         int ret = -ENODEV;
 546         struct net_device *ndev = NULL;
 547
 548         if ((dev_type == ARPHRD_INFINIBAND) && !rdma_protocol_ib(device, port))
 549                 return ret;
 550
 551         if ((dev_type != ARPHRD_INFINIBAND) && rdma_protocol_ib(device, port))
 552                 return ret;
 553
 554         if (dev_type == ARPHRD_ETHER && rdma_protocol_roce(device, port)) {
 555                 ndev = dev_get_by_index(&init_net, bound_if_index);
 556                 if (ndev && ndev->flags & IFF_LOOPBACK) {
 557                         pr_info("detected loopback device\n");
 558                         dev_put(ndev);
 559
 560                         if (!device->get_netdev)
 561                                 return -EOPNOTSUPP;
 562
 563                         ndev = device->get_netdev(device, port);
 564                         if (!ndev)
 565                                 return -ENODEV;
 566                 }
 567         } else {
 568                 gid_type = IB_GID_TYPE_IB;
 569         }
 570
 571         ret = ib_find_cached_gid_by_port(device, gid, gid_type, port,
 572                                          ndev, NULL);
 573
 574         if (ndev)
 575                 dev_put(ndev);
 576
 577         return ret;
 578 }
 579
 580 static int cma_acquire_dev(struct rdma_id_private *id_priv,
 581                            struct rdma_id_private *listen_id_priv)
 582 {
 583         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
 584         struct cma_device *cma_dev;
 585         union ib_gid gid, iboe_gid, *gidp;
 586         int ret = -ENODEV;
 587         u8 port;
 588
 589         if (dev_addr->dev_type != ARPHRD_INFINIBAND &&
 590             id_priv->id.ps == RDMA_PS_IPOIB)
 591                 return -EINVAL;
 592
 593         mutex_lock(&lock);
 594         rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
 595                     &iboe_gid);
 596
 597         memcpy(&gid, dev_addr->src_dev_addr +
 598                rdma_addr_gid_offset(dev_addr), sizeof gid);
 599
 600         if (listen_id_priv) {
 601                 cma_dev = listen_id_priv->cma_dev;
 602                 port = listen_id_priv->id.port_num;
 603                 gidp = rdma_protocol_roce(cma_dev->device, port) ?
 604                        &iboe_gid : &gid;
 605
 606                 ret = cma_validate_port(cma_dev->device, port,
 607                                         rdma_protocol_ib(cma_dev->device, port) ?
 608                                         IB_GID_TYPE_IB :
 609                                         listen_id_priv->gid_type, gidp,
 610                                         dev_addr->dev_type,
 611                                         dev_addr->bound_dev_if);
 612                 if (!ret) {
 613                         id_priv->id.port_num = port;
 614                         goto out;
 615                 }
 616         }
 617
 618         list_for_each_entry(cma_dev, &dev_list, list) {
 619                 for (port = 1; port <= cma_dev->device->phys_port_cnt; ++port) {
 620                         if (listen_id_priv &&
 621                             listen_id_priv->cma_dev == cma_dev &&
 622                             listen_id_priv->id.port_num == port)
 623                                 continue;
 624
 625                         gidp = rdma_protocol_roce(cma_dev->device, port) ?
 626                                &iboe_gid : &gid;
 627
 628                         ret = cma_validate_port(cma_dev->device, port,
 629                                                 rdma_protocol_ib(cma_dev->device, port) ?
 630                                                 IB_GID_TYPE_IB :
 631                                                 cma_dev->default_gid_type[port - 1],
 632                                                 gidp, dev_addr->dev_type,
 633                                                 dev_addr->bound_dev_if);
 634                         if (!ret) {
 635                                 id_priv->id.port_num = port;
 636                                 goto out;
 637                         }
 638                 }
 639         }
 640
 641 out:
 642         if (!ret)
 643                 cma_attach_to_dev(id_priv, cma_dev);
 644
 645         mutex_unlock(&lock);
 646         return ret;
 647 }
 648
 649 /*
 650  * Select the source IB device and address to reach the destination IB address.
 651  */
 652 static int cma_resolve_ib_dev(struct rdma_id_private *id_priv)
 653 {
 654         struct cma_device *cma_dev, *cur_dev;
 655         struct sockaddr_ib *addr;
 656         union ib_gid gid, sgid, *dgid;
 657         u16 pkey, index;
 658         u8 p;
 659         int i;
 660
 661         cma_dev = NULL;
 662         addr = (struct sockaddr_ib *) cma_dst_addr(id_priv);
 663         dgid = (union ib_gid *) &addr->sib_addr;
 664         pkey = ntohs(addr->sib_pkey);
 665
 666         list_for_each_entry(cur_dev, &dev_list, list) {
 667                 for (p = 1; p <= cur_dev->device->phys_port_cnt; ++p) {
 668                         if (!rdma_cap_af_ib(cur_dev->device, p))
 669                                 continue;
 670
 671                         if (ib_find_cached_pkey(cur_dev->device, p, pkey, &index))
 672                                 continue;
 673
 674                         for (i = 0; !ib_get_cached_gid(cur_dev->device, p, i,
 675                                                        &gid, NULL);
 676                              i++) {
 677                                 if (!memcmp(&gid, dgid, sizeof(gid))) {
 678                                         cma_dev = cur_dev;
 679                                         sgid = gid;
 680                                         id_priv->id.port_num = p;
 681                                         goto found;
 682                                 }
 683
 684                                 if (!cma_dev && (gid.global.subnet_prefix ==
 685                                                  dgid->global.subnet_prefix)) {
 686                                         cma_dev = cur_dev;
 687                                         sgid = gid;
 688                                         id_priv->id.port_num = p;
 689                                 }
 690                         }
 691                 }
 692         }
 693
 694         if (!cma_dev)
 695                 return -ENODEV;
 696
 697 found:
 698         cma_attach_to_dev(id_priv, cma_dev);
 699         addr = (struct sockaddr_ib *) cma_src_addr(id_priv);
 700         memcpy(&addr->sib_addr, &sgid, sizeof sgid);
 701         cma_translate_ib(addr, &id_priv->id.route.addr.dev_addr);
 702         return 0;
 703 }
 704
 705 static void cma_deref_id(struct rdma_id_private *id_priv)
 706 {
 707         if (atomic_dec_and_test(&id_priv->refcount))
 708                 complete(&id_priv->comp);
 709 }
 710
 711 struct rdma_cm_id *rdma_create_id(struct net *net,
 712                                   rdma_cm_event_handler event_handler,
 713                                   void *context, enum rdma_port_space ps,
 714                                   enum ib_qp_type qp_type)
 715 {
 716         struct rdma_id_private *id_priv;
 717
 718         id_priv = kzalloc(sizeof *id_priv, GFP_KERNEL);
 719         if (!id_priv)
 720                 return ERR_PTR(-ENOMEM);
 721
 722         id_priv->owner = task_pid_nr(current);
 723         id_priv->state = RDMA_CM_IDLE;
 724         id_priv->id.context = context;
 725         id_priv->id.event_handler = event_handler;
 726         id_priv->id.ps = ps;
 727         id_priv->id.qp_type = qp_type;
 728         spin_lock_init(&id_priv->lock);
 729         mutex_init(&id_priv->qp_mutex);
 730         init_completion(&id_priv->comp);
 731         atomic_set(&id_priv->refcount, 1);
 732         mutex_init(&id_priv->handler_mutex);
 733         INIT_LIST_HEAD(&id_priv->listen_list);
 734         INIT_LIST_HEAD(&id_priv->mc_list);
 735         get_random_bytes(&id_priv->seq_num, sizeof id_priv->seq_num);
 736         id_priv->id.route.addr.dev_addr.net = get_net(net);
 737
 738         return &id_priv->id;
 739 }
 740 EXPORT_SYMBOL(rdma_create_id);
 741
 742 static int cma_init_ud_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
 743 {
 744         struct ib_qp_attr qp_attr;
 745         int qp_attr_mask, ret;
 746
 747         qp_attr.qp_state = IB_QPS_INIT;
 748         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 749         if (ret)
 750                 return ret;
 751
 752         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 753         if (ret)
 754                 return ret;
 755
 756         qp_attr.qp_state = IB_QPS_RTR;
 757         ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
 758         if (ret)
 759                 return ret;
 760
 761         qp_attr.qp_state = IB_QPS_RTS;
 762         qp_attr.sq_psn = 0;
 763         ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE | IB_QP_SQ_PSN);
 764
 765         return ret;
 766 }
 767
 768 static int cma_init_conn_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
 769 {
 770         struct ib_qp_attr qp_attr;
 771         int qp_attr_mask, ret;
 772
 773         qp_attr.qp_state = IB_QPS_INIT;
 774         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 775         if (ret)
 776                 return ret;
 777
 778         return ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 779 }
 780
 781 int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
 782                    struct ib_qp_init_attr *qp_init_attr)
 783 {
 784         struct rdma_id_private *id_priv;
 785         struct ib_qp *qp;
 786         int ret;
 787
 788         id_priv = container_of(id, struct rdma_id_private, id);
 789         if (id->device != pd->device)
 790                 return -EINVAL;
 791
 792         qp_init_attr->port_num = id->port_num;
 793         qp = ib_create_qp(pd, qp_init_attr);
 794         if (IS_ERR(qp))
 795                 return PTR_ERR(qp);
 796
 797         if (id->qp_type == IB_QPT_UD)
 798                 ret = cma_init_ud_qp(id_priv, qp);
 799         else
 800                 ret = cma_init_conn_qp(id_priv, qp);
 801         if (ret)
 802                 goto err;
 803
 804         id->qp = qp;
 805         id_priv->qp_num = qp->qp_num;
 806         id_priv->srq = (qp->srq != NULL);
 807         return 0;
 808 err:
 809         ib_destroy_qp(qp);
 810         return ret;
 811 }
 812 EXPORT_SYMBOL(rdma_create_qp);
 813
 814 void rdma_destroy_qp(struct rdma_cm_id *id)
 815 {
 816         struct rdma_id_private *id_priv;
 817
 818         id_priv = container_of(id, struct rdma_id_private, id);
 819         mutex_lock(&id_priv->qp_mutex);
 820         ib_destroy_qp(id_priv->id.qp);
 821         id_priv->id.qp = NULL;
 822         mutex_unlock(&id_priv->qp_mutex);
 823 }
 824 EXPORT_SYMBOL(rdma_destroy_qp);
 825
 826 static int cma_modify_qp_rtr(struct rdma_id_private *id_priv,
 827                              struct rdma_conn_param *conn_param)
 828 {
 829         struct ib_qp_attr qp_attr;
 830         int qp_attr_mask, ret;
 831         union ib_gid sgid;
 832
 833         mutex_lock(&id_priv->qp_mutex);
 834         if (!id_priv->id.qp) {
 835                 ret = 0;
 836                 goto out;
 837         }
 838
 839         /* Need to update QP attributes from default values. */
 840         qp_attr.qp_state = IB_QPS_INIT;
 841         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 842         if (ret)
 843                 goto out;
 844
 845         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
 846         if (ret)
 847                 goto out;
 848
 849         qp_attr.qp_state = IB_QPS_RTR;
 850         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 851         if (ret)
 852                 goto out;
 853
 854         ret = ib_query_gid(id_priv->id.device, id_priv->id.port_num,
 855                            qp_attr.ah_attr.grh.sgid_index, &sgid, NULL);
 856         if (ret)
 857                 goto out;
 858
 859         BUG_ON(id_priv->cma_dev->device != id_priv->id.device);
 860
 861         if (conn_param)
 862                 qp_attr.max_dest_rd_atomic = conn_param->responder_resources;
 863         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
 864 out:
 865         mutex_unlock(&id_priv->qp_mutex);
 866         return ret;
 867 }
 868
 869 static int cma_modify_qp_rts(struct rdma_id_private *id_priv,
 870                              struct rdma_conn_param *conn_param)
 871 {
 872         struct ib_qp_attr qp_attr;
 873         int qp_attr_mask, ret;
 874
 875         mutex_lock(&id_priv->qp_mutex);
 876         if (!id_priv->id.qp) {
 877                 ret = 0;
 878                 goto out;
 879         }
 880
 881         qp_attr.qp_state = IB_QPS_RTS;
 882         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 883         if (ret)
 884                 goto out;
 885
 886         if (conn_param)
 887                 qp_attr.max_rd_atomic = conn_param->initiator_depth;
 888         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
 889 out:
 890         mutex_unlock(&id_priv->qp_mutex);
 891         return ret;
 892 }
 893
 894 static int cma_modify_qp_err(struct rdma_id_private *id_priv)
 895 {
 896         struct ib_qp_attr qp_attr;
 897         int ret;
 898
 899         mutex_lock(&id_priv->qp_mutex);
 900         if (!id_priv->id.qp) {
 901                 ret = 0;
 902                 goto out;
 903         }
 904
 905         qp_attr.qp_state = IB_QPS_ERR;
 906         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, IB_QP_STATE);
 907 out:
 908         mutex_unlock(&id_priv->qp_mutex);
 909         return ret;
 910 }
 911
 912 static int cma_ib_init_qp_attr(struct rdma_id_private *id_priv,
 913                                struct ib_qp_attr *qp_attr, int *qp_attr_mask)
 914 {
 915         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
 916         int ret;
 917         u16 pkey;
 918
 919         if (rdma_cap_eth_ah(id_priv->id.device, id_priv->id.port_num))
 920                 pkey = 0xffff;
 921         else
 922                 pkey = ib_addr_get_pkey(dev_addr);
 923
 924         ret = ib_find_cached_pkey(id_priv->id.device, id_priv->id.port_num,
 925                                   pkey, &qp_attr->pkey_index);
 926         if (ret)
 927                 return ret;
 928
 929         qp_attr->port_num = id_priv->id.port_num;
 930         *qp_attr_mask = IB_QP_STATE | IB_QP_PKEY_INDEX | IB_QP_PORT;
 931
 932         if (id_priv->id.qp_type == IB_QPT_UD) {
 933                 ret = cma_set_qkey(id_priv, 0);
 934                 if (ret)
 935                         return ret;
 936
 937                 qp_attr->qkey = id_priv->qkey;
 938                 *qp_attr_mask |= IB_QP_QKEY;
 939         } else {
 940                 qp_attr->qp_access_flags = 0;
 941                 *qp_attr_mask |= IB_QP_ACCESS_FLAGS;
 942         }
 943         return 0;
 944 }
 945
 946 int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
 947                        int *qp_attr_mask)
 948 {
 949         struct rdma_id_private *id_priv;
 950         int ret = 0;
 951
 952         id_priv = container_of(id, struct rdma_id_private, id);
 953         if (rdma_cap_ib_cm(id->device, id->port_num)) {
 954                 if (!id_priv->cm_id.ib || (id_priv->id.qp_type == IB_QPT_UD))
 955                         ret = cma_ib_init_qp_attr(id_priv, qp_attr, qp_attr_mask);
 956                 else
 957                         ret = ib_cm_init_qp_attr(id_priv->cm_id.ib, qp_attr,
 958                                                  qp_attr_mask);
 959
 960                 if (qp_attr->qp_state == IB_QPS_RTR)
 961                         qp_attr->rq_psn = id_priv->seq_num;
 962         } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
 963                 if (!id_priv->cm_id.iw) {
 964                         qp_attr->qp_access_flags = 0;
 965                         *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS;
 966                 } else
 967                         ret = iw_cm_init_qp_attr(id_priv->cm_id.iw, qp_attr,
 968                                                  qp_attr_mask);
 969         } else
 970                 ret = -ENOSYS;
 971
 972         return ret;
 973 }
 974 EXPORT_SYMBOL(rdma_init_qp_attr);
 975
 976 static inline int cma_zero_addr(struct sockaddr *addr)
 977 {
 978         switch (addr->sa_family) {
 979         case AF_INET:
 980                 return ipv4_is_zeronet(((struct sockaddr_in *)addr)->sin_addr.s_addr);
 981         case AF_INET6:
 982                 return ipv6_addr_any(&((struct sockaddr_in6 *) addr)->sin6_addr);
 983         case AF_IB:
 984                 return ib_addr_any(&((struct sockaddr_ib *) addr)->sib_addr);
 985         default:
 986                 return 0;
 987         }
 988 }
 989
 990 static inline int cma_loopback_addr(struct sockaddr *addr)
 991 {
 992         switch (addr->sa_family) {
 993         case AF_INET:
 994                 return ipv4_is_loopback(((struct sockaddr_in *) addr)->sin_addr.s_addr);
 995         case AF_INET6:
 996                 return ipv6_addr_loopback(&((struct sockaddr_in6 *) addr)->sin6_addr);
 997         case AF_IB:
 998                 return ib_addr_loopback(&((struct sockaddr_ib *) addr)->sib_addr);
 999         default:
1000                 return 0;
1001         }
1002 }
1003
1004 static inline int cma_any_addr(struct sockaddr *addr)
1005 {
1006         return cma_zero_addr(addr) || cma_loopback_addr(addr);
1007 }
1008
1009 static int cma_addr_cmp(struct sockaddr *src, struct sockaddr *dst)
1010 {
1011         if (src->sa_family != dst->sa_family)
1012                 return -1;
1013
1014         switch (src->sa_family) {
1015         case AF_INET:
1016                 return ((struct sockaddr_in *) src)->sin_addr.s_addr !=
1017                        ((struct sockaddr_in *) dst)->sin_addr.s_addr;
1018         case AF_INET6:
1019                 return ipv6_addr_cmp(&((struct sockaddr_in6 *) src)->sin6_addr,
1020                                      &((struct sockaddr_in6 *) dst)->sin6_addr);
1021         default:
1022                 return ib_addr_cmp(&((struct sockaddr_ib *) src)->sib_addr,
1023                                    &((struct sockaddr_ib *) dst)->sib_addr);
1024         }
1025 }
1026
1027 static __be16 cma_port(struct sockaddr *addr)
1028 {
1029         struct sockaddr_ib *sib;
1030
1031         switch (addr->sa_family) {
1032         case AF_INET:
1033                 return ((struct sockaddr_in *) addr)->sin_port;
1034         case AF_INET6:
1035                 return ((struct sockaddr_in6 *) addr)->sin6_port;
1036         case AF_IB:
1037                 sib = (struct sockaddr_ib *) addr;
1038                 return htons((u16) (be64_to_cpu(sib->sib_sid) &
1039                                     be64_to_cpu(sib->sib_sid_mask)));
1040         default:
1041                 return 0;
1042         }
1043 }
1044
1045 static inline int cma_any_port(struct sockaddr *addr)
1046 {
1047         return !cma_port(addr);
1048 }
1049
1050 static void cma_save_ib_info(struct sockaddr *src_addr,
1051                              struct sockaddr *dst_addr,
1052                              struct rdma_cm_id *listen_id,
1053                              struct ib_sa_path_rec *path)
1054 {
1055         struct sockaddr_ib *listen_ib, *ib;
1056
1057         listen_ib = (struct sockaddr_ib *) &listen_id->route.addr.src_addr;
1058         if (src_addr) {
1059                 ib = (struct sockaddr_ib *)src_addr;
1060                 ib->sib_family = AF_IB;
1061                 if (path) {
1062                         ib->sib_pkey = path->pkey;
1063                         ib->sib_flowinfo = path->flow_label;
1064                         memcpy(&ib->sib_addr, &path->sgid, 16);
1065                         ib->sib_sid = path->service_id;
1066                         ib->sib_scope_id = 0;
1067                 } else {
1068                         ib->sib_pkey = listen_ib->sib_pkey;
1069                         ib->sib_flowinfo = listen_ib->sib_flowinfo;
1070                         ib->sib_addr = listen_ib->sib_addr;
1071                         ib->sib_sid = listen_ib->sib_sid;
1072                         ib->sib_scope_id = listen_ib->sib_scope_id;
1073                 }
1074                 ib->sib_sid_mask = cpu_to_be64(0xffffffffffffffffULL);
1075         }
1076         if (dst_addr) {
1077                 ib = (struct sockaddr_ib *)dst_addr;
1078                 ib->sib_family = AF_IB;
1079                 if (path) {
1080                         ib->sib_pkey = path->pkey;
1081                         ib->sib_flowinfo = path->flow_label;
1082                         memcpy(&ib->sib_addr, &path->dgid, 16);
1083                 }
1084         }
1085 }
1086
1087 static void cma_save_ip4_info(struct sockaddr *src_addr,
1088                               struct sockaddr *dst_addr,
1089                               struct cma_hdr *hdr,
1090                               __be16 local_port)
1091 {
1092         struct sockaddr_in *ip4;
1093
1094         if (src_addr) {
1095                 ip4 = (struct sockaddr_in *)src_addr;
1096                 ip4->sin_family = AF_INET;
1097                 ip4->sin_addr.s_addr = hdr->dst_addr.ip4.addr;
1098                 ip4->sin_port = local_port;
1099         }
1100
1101         if (dst_addr) {
1102                 ip4 = (struct sockaddr_in *)dst_addr;
1103                 ip4->sin_family = AF_INET;
1104                 ip4->sin_addr.s_addr = hdr->src_addr.ip4.addr;
1105                 ip4->sin_port = hdr->port;
1106         }
1107 }
1108
1109 static void cma_save_ip6_info(struct sockaddr *src_addr,
1110                               struct sockaddr *dst_addr,
1111                               struct cma_hdr *hdr,
1112                               __be16 local_port)
1113 {
1114         struct sockaddr_in6 *ip6;
1115
1116         if (src_addr) {
1117                 ip6 = (struct sockaddr_in6 *)src_addr;
1118                 ip6->sin6_family = AF_INET6;
1119                 ip6->sin6_addr = hdr->dst_addr.ip6;
1120                 ip6->sin6_port = local_port;
1121         }
1122
1123         if (dst_addr) {
1124                 ip6 = (struct sockaddr_in6 *)dst_addr;
1125                 ip6->sin6_family = AF_INET6;
1126                 ip6->sin6_addr = hdr->src_addr.ip6;
1127                 ip6->sin6_port = hdr->port;
1128         }
1129 }
1130
1131 static u16 cma_port_from_service_id(__be64 service_id)
1132 {
1133         return (u16)be64_to_cpu(service_id);
1134 }
1135
1136 static int cma_save_ip_info(struct sockaddr *src_addr,
1137                             struct sockaddr *dst_addr,
1138                             struct ib_cm_event *ib_event,
1139                             __be64 service_id)
1140 {
1141         struct cma_hdr *hdr;
1142         __be16 port;
1143
1144         hdr = ib_event->private_data;
1145         if (hdr->cma_version != CMA_VERSION)
1146                 return -EINVAL;
1147
1148         port = htons(cma_port_from_service_id(service_id));
1149
1150         switch (cma_get_ip_ver(hdr)) {
1151         case 4:
1152                 cma_save_ip4_info(src_addr, dst_addr, hdr, port);
1153                 break;
1154         case 6:
1155                 cma_save_ip6_info(src_addr, dst_addr, hdr, port);
1156                 break;
1157         default:
1158                 return -EAFNOSUPPORT;
1159         }
1160
1161         return 0;
1162 }
1163
1164 static int cma_save_net_info(struct sockaddr *src_addr,
1165                              struct sockaddr *dst_addr,
1166                              struct rdma_cm_id *listen_id,
1167                              struct ib_cm_event *ib_event,
1168                              sa_family_t sa_family, __be64 service_id)
1169 {
1170         if (sa_family == AF_IB) {
1171                 if (ib_event->event == IB_CM_REQ_RECEIVED)
1172                         cma_save_ib_info(src_addr, dst_addr, listen_id,
1173                                          ib_event->param.req_rcvd.primary_path);
1174                 else if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED)
1175                         cma_save_ib_info(src_addr, dst_addr, listen_id, NULL);
1176                 return 0;
1177         }
1178
1179         return cma_save_ip_info(src_addr, dst_addr, ib_event, service_id);
1180 }
1181
1182 static int cma_save_req_info(const struct ib_cm_event *ib_event,
1183                              struct cma_req_info *req)
1184 {
1185         const struct ib_cm_req_event_param *req_param =
1186                 &ib_event->param.req_rcvd;
1187         const struct ib_cm_sidr_req_event_param *sidr_param =
1188                 &ib_event->param.sidr_req_rcvd;
1189
1190         switch (ib_event->event) {
1191         case IB_CM_REQ_RECEIVED:
1192                 req->device     = req_param->listen_id->device;
1193                 req->port       = req_param->port;
1194                 memcpy(&req->local_gid, &req_param->primary_path->sgid,
1195                        sizeof(req->local_gid));
1196                 req->has_gid    = true;
1197                 req->service_id = req_param->primary_path->service_id;
1198                 req->pkey       = be16_to_cpu(req_param->primary_path->pkey);
1199                 if (req->pkey != req_param->bth_pkey)
1200                         pr_warn_ratelimited("RDMA CMA: got different BTH P_Key (0x%x) and primary path P_Key (0x%x)\n"
1201                                             "RDMA CMA: in the future this may cause the request to be dropped\n",
1202                                             req_param->bth_pkey, req->pkey);
1203                 break;
1204         case IB_CM_SIDR_REQ_RECEIVED:
1205                 req->device     = sidr_param->listen_id->device;
1206                 req->port       = sidr_param->port;
1207                 req->has_gid    = false;
1208                 req->service_id = sidr_param->service_id;
1209                 req->pkey       = sidr_param->pkey;
1210                 if (req->pkey != sidr_param->bth_pkey)
1211                         pr_warn_ratelimited("RDMA CMA: got different BTH P_Key (0x%x) and SIDR request payload P_Key (0x%x)\n"
1212                                             "RDMA CMA: in the future this may cause the request to be dropped\n",
1213                                             sidr_param->bth_pkey, req->pkey);
1214                 break;
1215         default:
1216                 return -EINVAL;
1217         }
1218
1219         return 0;
1220 }
1221
1222 static bool validate_ipv4_net_dev(struct net_device *net_dev,
1223                                   const struct sockaddr_in *dst_addr,
1224                                   const struct sockaddr_in *src_addr)
1225 {
1226         __be32 daddr = dst_addr->sin_addr.s_addr,
1227                saddr = src_addr->sin_addr.s_addr;
1228         struct fib_result res;
1229         struct flowi4 fl4;
1230         int err;
1231         bool ret;
1232
1233         if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) ||
1234             ipv4_is_lbcast(daddr) || ipv4_is_zeronet(saddr) ||
1235             ipv4_is_zeronet(daddr) || ipv4_is_loopback(daddr) ||
1236             ipv4_is_loopback(saddr))
1237                 return false;
1238
1239         memset(&fl4, 0, sizeof(fl4));
1240         fl4.flowi4_iif = net_dev->ifindex;
1241         fl4.daddr = daddr;
1242         fl4.saddr = saddr;
1243
1244         rcu_read_lock();
1245         err = fib_lookup(dev_net(net_dev), &fl4, &res, 0);
1246         ret = err == 0 && FIB_RES_DEV(res) == net_dev;
1247         rcu_read_unlock();
1248
1249         return ret;
1250 }
1251
1252 static bool validate_ipv6_net_dev(struct net_device *net_dev,
1253                                   const struct sockaddr_in6 *dst_addr,
1254                                   const struct sockaddr_in6 *src_addr)
1255 {
1256 #if IS_ENABLED(CONFIG_IPV6)
1257         const int strict = ipv6_addr_type(&dst_addr->sin6_addr) &
1258                            IPV6_ADDR_LINKLOCAL;
1259         struct rt6_info *rt = rt6_lookup(dev_net(net_dev), &dst_addr->sin6_addr,
1260                                          &src_addr->sin6_addr, net_dev->ifindex,
1261                                          strict);
1262         bool ret;
1263
1264         if (!rt)
1265                 return false;
1266
1267         ret = rt->rt6i_idev->dev == net_dev;
1268         ip6_rt_put(rt);
1269
1270         return ret;
1271 #else
1272         return false;
1273 #endif
1274 }
1275
1276 static bool validate_net_dev(struct net_device *net_dev,
1277                              const struct sockaddr *daddr,
1278                              const struct sockaddr *saddr)
1279 {
1280         const struct sockaddr_in *daddr4 = (const struct sockaddr_in *)daddr;
1281         const struct sockaddr_in *saddr4 = (const struct sockaddr_in *)saddr;
1282         const struct sockaddr_in6 *daddr6 = (const struct sockaddr_in6 *)daddr;
1283         const struct sockaddr_in6 *saddr6 = (const struct sockaddr_in6 *)saddr;
1284
1285         switch (daddr->sa_family) {
1286         case AF_INET:
1287                 return saddr->sa_family == AF_INET &&
1288                        validate_ipv4_net_dev(net_dev, daddr4, saddr4);
1289
1290         case AF_INET6:
1291                 return saddr->sa_family == AF_INET6 &&
1292                        validate_ipv6_net_dev(net_dev, daddr6, saddr6);
1293
1294         default:
1295                 return false;
1296         }
1297 }
1298
1299 static struct net_device *cma_get_net_dev(struct ib_cm_event *ib_event,
1300                                           const struct cma_req_info *req)
1301 {
1302         struct sockaddr_storage listen_addr_storage, src_addr_storage;
1303         struct sockaddr *listen_addr = (struct sockaddr *)&listen_addr_storage,
1304                         *src_addr = (struct sockaddr *)&src_addr_storage;
1305         struct net_device *net_dev;
1306         const union ib_gid *gid = req->has_gid ? &req->local_gid : NULL;
1307         int err;
1308
1309         err = cma_save_ip_info(listen_addr, src_addr, ib_event,
1310                                req->service_id);
1311         if (err)
1312                 return ERR_PTR(err);
1313
1314         net_dev = ib_get_net_dev_by_params(req->device, req->port, req->pkey,
1315                                            gid, listen_addr);
1316         if (!net_dev)
1317                 return ERR_PTR(-ENODEV);
1318
1319         if (!validate_net_dev(net_dev, listen_addr, src_addr)) {
1320                 dev_put(net_dev);
1321                 return ERR_PTR(-EHOSTUNREACH);
1322         }
1323
1324         return net_dev;
1325 }
1326
1327 static enum rdma_port_space rdma_ps_from_service_id(__be64 service_id)
1328 {
1329         return (be64_to_cpu(service_id) >> 16) & 0xffff;
1330 }
1331
1332 static bool cma_match_private_data(struct rdma_id_private *id_priv,
1333                                    const struct cma_hdr *hdr)
1334 {
1335         struct sockaddr *addr = cma_src_addr(id_priv);
1336         __be32 ip4_addr;
1337         struct in6_addr ip6_addr;
1338
1339         if (cma_any_addr(addr) && !id_priv->afonly)
1340                 return true;
1341
1342         switch (addr->sa_family) {
1343         case AF_INET:
1344                 ip4_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
1345                 if (cma_get_ip_ver(hdr) != 4)
1346                         return false;
1347                 if (!cma_any_addr(addr) &&
1348                     hdr->dst_addr.ip4.addr != ip4_addr)
1349                         return false;
1350                 break;
1351         case AF_INET6:
1352                 ip6_addr = ((struct sockaddr_in6 *)addr)->sin6_addr;
1353                 if (cma_get_ip_ver(hdr) != 6)
1354                         return false;
1355                 if (!cma_any_addr(addr) &&
1356                     memcmp(&hdr->dst_addr.ip6, &ip6_addr, sizeof(ip6_addr)))
1357                         return false;
1358                 break;
1359         case AF_IB:
1360                 return true;
1361         default:
1362                 return false;
1363         }
1364
1365         return true;
1366 }
1367
1368 static bool cma_protocol_roce_dev_port(struct ib_device *device, int port_num)
1369 {
1370         enum rdma_link_layer ll = rdma_port_get_link_layer(device, port_num);
1371         enum rdma_transport_type transport =
1372                 rdma_node_get_transport(device->node_type);
1373
1374         return ll == IB_LINK_LAYER_ETHERNET && transport == RDMA_TRANSPORT_IB;
1375 }
1376
1377 static bool cma_protocol_roce(const struct rdma_cm_id *id)
1378 {
1379         struct ib_device *device = id->device;
1380         const int port_num = id->port_num ?: rdma_start_port(device);
1381
1382         return cma_protocol_roce_dev_port(device, port_num);
1383 }
1384
1385 static bool cma_match_net_dev(const struct rdma_cm_id *id,
1386                               const struct net_device *net_dev,
1387                               u8 port_num)
1388 {
1389         const struct rdma_addr *addr = &id->route.addr;
1390
1391         if (!net_dev)
1392                 /* This request is an AF_IB request or a RoCE request */
1393                 return (!id->port_num || id->port_num == port_num) &&
1394                        (addr->src_addr.ss_family == AF_IB ||
1395                         cma_protocol_roce_dev_port(id->device, port_num));
1396
1397         return !addr->dev_addr.bound_dev_if ||
1398                (net_eq(dev_net(net_dev), addr->dev_addr.net) &&
1399                 addr->dev_addr.bound_dev_if == net_dev->ifindex);
1400 }
1401
1402 static struct rdma_id_private *cma_find_listener(
1403                 const struct rdma_bind_list *bind_list,
1404                 const struct ib_cm_id *cm_id,
1405                 const struct ib_cm_event *ib_event,
1406                 const struct cma_req_info *req,
1407                 const struct net_device *net_dev)
1408 {
1409         struct rdma_id_private *id_priv, *id_priv_dev;
1410
1411         if (!bind_list)
1412                 return ERR_PTR(-EINVAL);
1413
1414         hlist_for_each_entry(id_priv, &bind_list->owners, node) {
1415                 if (cma_match_private_data(id_priv, ib_event->private_data)) {
1416                         if (id_priv->id.device == cm_id->device &&
1417                             cma_match_net_dev(&id_priv->id, net_dev, req->port))
1418                                 return id_priv;
1419                         list_for_each_entry(id_priv_dev,
1420                                             &id_priv->listen_list,
1421                                             listen_list) {
1422                                 if (id_priv_dev->id.device == cm_id->device &&
1423                                     cma_match_net_dev(&id_priv_dev->id, net_dev, req->port))
1424                                         return id_priv_dev;
1425                         }
1426                 }
1427         }
1428
1429         return ERR_PTR(-EINVAL);
1430 }
1431
1432 static struct rdma_id_private *cma_id_from_event(struct ib_cm_id *cm_id,
1433                                                  struct ib_cm_event *ib_event,
1434                                                  struct net_device **net_dev)
1435 {
1436         struct cma_req_info req;
1437         struct rdma_bind_list *bind_list;
1438         struct rdma_id_private *id_priv;
1439         int err;
1440
1441         err = cma_save_req_info(ib_event, &req);
1442         if (err)
1443                 return ERR_PTR(err);
1444
1445         *net_dev = cma_get_net_dev(ib_event, &req);
1446         if (IS_ERR(*net_dev)) {
1447                 if (PTR_ERR(*net_dev) == -EAFNOSUPPORT) {
1448                         /* Assuming the protocol is AF_IB */
1449                         *net_dev = NULL;
1450                 } else if (cma_protocol_roce_dev_port(req.device, req.port)) {
1451                         /* TODO find the net dev matching the request parameters
1452                          * through the RoCE GID table */
1453                         *net_dev = NULL;
1454                 } else {
1455                         return ERR_CAST(*net_dev);
1456                 }
1457         }
1458
1459         bind_list = cma_ps_find(*net_dev ? dev_net(*net_dev) : &init_net,
1460                                 rdma_ps_from_service_id(req.service_id),
1461                                 cma_port_from_service_id(req.service_id));
1462         id_priv = cma_find_listener(bind_list, cm_id, ib_event, &req, *net_dev);
1463         if (IS_ERR(id_priv) && *net_dev) {
1464                 dev_put(*net_dev);
1465                 *net_dev = NULL;
1466         }
1467
1468         return id_priv;
1469 }
1470
1471 static inline int cma_user_data_offset(struct rdma_id_private *id_priv)
1472 {
1473         return cma_family(id_priv) == AF_IB ? 0 : sizeof(struct cma_hdr);
1474 }
1475
1476 static void cma_cancel_route(struct rdma_id_private *id_priv)
1477 {
1478         if (rdma_cap_ib_sa(id_priv->id.device, id_priv->id.port_num)) {
1479                 if (id_priv->query)
1480                         ib_sa_cancel_query(id_priv->query_id, id_priv->query);
1481         }
1482 }
1483
1484 static void cma_cancel_listens(struct rdma_id_private *id_priv)
1485 {
1486         struct rdma_id_private *dev_id_priv;
1487
1488         /*
1489          * Remove from listen_any_list to prevent added devices from spawning
1490          * additional listen requests.
1491          */
1492         mutex_lock(&lock);
1493         list_del(&id_priv->list);
1494
1495         while (!list_empty(&id_priv->listen_list)) {
1496                 dev_id_priv = list_entry(id_priv->listen_list.next,
1497                                          struct rdma_id_private, listen_list);
1498                 /* sync with device removal to avoid duplicate destruction */
1499                 list_del_init(&dev_id_priv->list);
1500                 list_del(&dev_id_priv->listen_list);
1501                 mutex_unlock(&lock);
1502
1503                 rdma_destroy_id(&dev_id_priv->id);
1504                 mutex_lock(&lock);
1505         }
1506         mutex_unlock(&lock);
1507 }
1508
1509 static void cma_cancel_operation(struct rdma_id_private *id_priv,
1510                                  enum rdma_cm_state state)
1511 {
1512         switch (state) {
1513         case RDMA_CM_ADDR_QUERY:
1514                 rdma_addr_cancel(&id_priv->id.route.addr.dev_addr);
1515                 break;
1516         case RDMA_CM_ROUTE_QUERY:
1517                 cma_cancel_route(id_priv);
1518                 break;
1519         case RDMA_CM_LISTEN:
1520                 if (cma_any_addr(cma_src_addr(id_priv)) && !id_priv->cma_dev)
1521                         cma_cancel_listens(id_priv);
1522                 break;
1523         default:
1524                 break;
1525         }
1526 }
1527
1528 static void cma_release_port(struct rdma_id_private *id_priv)
1529 {
1530         struct rdma_bind_list *bind_list = id_priv->bind_list;
1531         struct net *net = id_priv->id.route.addr.dev_addr.net;
1532
1533         if (!bind_list)
1534                 return;
1535
1536         mutex_lock(&lock);
1537         hlist_del(&id_priv->node);
1538         if (hlist_empty(&bind_list->owners)) {
1539                 cma_ps_remove(net, bind_list->ps, bind_list->port);
1540                 kfree(bind_list);
1541         }
1542         mutex_unlock(&lock);
1543 }
1544
1545 static void cma_leave_mc_groups(struct rdma_id_private *id_priv)
1546 {
1547         struct cma_multicast *mc;
1548
1549         while (!list_empty(&id_priv->mc_list)) {
1550                 mc = container_of(id_priv->mc_list.next,
1551                                   struct cma_multicast, list);
1552                 list_del(&mc->list);
1553                 if (rdma_cap_ib_mcast(id_priv->cma_dev->device,
1554                                       id_priv->id.port_num)) {
1555                         ib_sa_free_multicast(mc->multicast.ib);
1556                         kfree(mc);
1557                 } else {
1558                         if (mc->igmp_joined) {
1559                                 struct rdma_dev_addr *dev_addr =
1560                                         &id_priv->id.route.addr.dev_addr;
1561                                 struct net_device *ndev = NULL;
1562
1563                                 if (dev_addr->bound_dev_if)
1564                                         ndev = dev_get_by_index(&init_net,
1565                                                                 dev_addr->bound_dev_if);
1566                                 if (ndev) {
1567                                         cma_igmp_send(ndev,
1568                                                       &mc->multicast.ib->rec.mgid,
1569                                                       false);
1570                                         dev_put(ndev);
1571                                 }
1572                         }
1573                         kref_put(&mc->mcref, release_mc);
1574                 }
1575         }
1576 }
1577
1578 void rdma_destroy_id(struct rdma_cm_id *id)
1579 {
1580         struct rdma_id_private *id_priv;
1581         enum rdma_cm_state state;
1582
1583         id_priv = container_of(id, struct rdma_id_private, id);
1584         state = cma_exch(id_priv, RDMA_CM_DESTROYING);
1585         cma_cancel_operation(id_priv, state);
1586
1587         /*
1588          * Wait for any active callback to finish.  New callbacks will find
1589          * the id_priv state set to destroying and abort.
1590          */
1591         mutex_lock(&id_priv->handler_mutex);
1592         mutex_unlock(&id_priv->handler_mutex);
1593
1594         if (id_priv->cma_dev) {
1595                 if (rdma_cap_ib_cm(id_priv->id.device, 1)) {
1596                         if (id_priv->cm_id.ib)
1597                                 ib_destroy_cm_id(id_priv->cm_id.ib);
1598                 } else if (rdma_cap_iw_cm(id_priv->id.device, 1)) {
1599                         if (id_priv->cm_id.iw)
1600                                 iw_destroy_cm_id(id_priv->cm_id.iw);
1601                 }
1602                 cma_leave_mc_groups(id_priv);
1603                 cma_release_dev(id_priv);
1604         }
1605
1606         cma_release_port(id_priv);
1607         cma_deref_id(id_priv);
1608         wait_for_completion(&id_priv->comp);
1609
1610         if (id_priv->internal_id)
1611                 cma_deref_id(id_priv->id.context);
1612
1613         kfree(id_priv->id.route.path_rec);
1614         put_net(id_priv->id.route.addr.dev_addr.net);
1615         kfree(id_priv);
1616 }
1617 EXPORT_SYMBOL(rdma_destroy_id);
1618
1619 static int cma_rep_recv(struct rdma_id_private *id_priv)
1620 {
1621         int ret;
1622
1623         ret = cma_modify_qp_rtr(id_priv, NULL);
1624         if (ret)
1625                 goto reject;
1626
1627         ret = cma_modify_qp_rts(id_priv, NULL);
1628         if (ret)
1629                 goto reject;
1630
1631         ret = ib_send_cm_rtu(id_priv->cm_id.ib, NULL, 0);
1632         if (ret)
1633                 goto reject;
1634
1635         return 0;
1636 reject:
1637         cma_modify_qp_err(id_priv);
1638         ib_send_cm_rej(id_priv->cm_id.ib, IB_CM_REJ_CONSUMER_DEFINED,
1639                        NULL, 0, NULL, 0);
1640         return ret;
1641 }
1642
1643 static void cma_set_rep_event_data(struct rdma_cm_event *event,
1644                                    struct ib_cm_rep_event_param *rep_data,
1645                                    void *private_data)
1646 {
1647         event->param.conn.private_data = private_data;
1648         event->param.conn.private_data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
1649         event->param.conn.responder_resources = rep_data->responder_resources;
1650         event->param.conn.initiator_depth = rep_data->initiator_depth;
1651         event->param.conn.flow_control = rep_data->flow_control;
1652         event->param.conn.rnr_retry_count = rep_data->rnr_retry_count;
1653         event->param.conn.srq = rep_data->srq;
1654         event->param.conn.qp_num = rep_data->remote_qpn;
1655 }
1656
1657 static int cma_ib_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
1658 {
1659         struct rdma_id_private *id_priv = cm_id->context;
1660         struct rdma_cm_event event;
1661         int ret = 0;
1662
1663         mutex_lock(&id_priv->handler_mutex);
1664         if ((ib_event->event != IB_CM_TIMEWAIT_EXIT &&
1665              id_priv->state != RDMA_CM_CONNECT) ||
1666             (ib_event->event == IB_CM_TIMEWAIT_EXIT &&
1667              id_priv->state != RDMA_CM_DISCONNECT))
1668                 goto out;
1669
1670         memset(&event, 0, sizeof event);
1671         switch (ib_event->event) {
1672         case IB_CM_REQ_ERROR:
1673         case IB_CM_REP_ERROR:
1674                 event.event = RDMA_CM_EVENT_UNREACHABLE;
1675                 event.status = -ETIMEDOUT;
1676                 break;
1677         case IB_CM_REP_RECEIVED:
1678                 if (id_priv->id.qp) {
1679                         event.status = cma_rep_recv(id_priv);
1680                         event.event = event.status ? RDMA_CM_EVENT_CONNECT_ERROR :
1681                                                      RDMA_CM_EVENT_ESTABLISHED;
1682                 } else {
1683                         event.event = RDMA_CM_EVENT_CONNECT_RESPONSE;
1684                 }
1685                 cma_set_rep_event_data(&event, &ib_event->param.rep_rcvd,
1686                                        ib_event->private_data);
1687                 break;
1688         case IB_CM_RTU_RECEIVED:
1689         case IB_CM_USER_ESTABLISHED:
1690                 event.event = RDMA_CM_EVENT_ESTABLISHED;
1691                 break;
1692         case IB_CM_DREQ_ERROR:
1693                 event.status = -ETIMEDOUT; /* fall through */
1694         case IB_CM_DREQ_RECEIVED:
1695         case IB_CM_DREP_RECEIVED:
1696                 if (!cma_comp_exch(id_priv, RDMA_CM_CONNECT,
1697                                    RDMA_CM_DISCONNECT))
1698                         goto out;
1699                 event.event = RDMA_CM_EVENT_DISCONNECTED;
1700                 break;
1701         case IB_CM_TIMEWAIT_EXIT:
1702                 event.event = RDMA_CM_EVENT_TIMEWAIT_EXIT;
1703                 break;
1704         case IB_CM_MRA_RECEIVED:
1705                 /* ignore event */
1706                 goto out;
1707         case IB_CM_REJ_RECEIVED:
1708                 cma_modify_qp_err(id_priv);
1709                 event.status = ib_event->param.rej_rcvd.reason;
1710                 event.event = RDMA_CM_EVENT_REJECTED;
1711                 event.param.conn.private_data = ib_event->private_data;
1712                 event.param.conn.private_data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
1713                 break;
1714         default:
1715                 pr_err("RDMA CMA: unexpected IB CM event: %d\n",
1716                        ib_event->event);
1717                 goto out;
1718         }
1719
1720         ret = id_priv->id.event_handler(&id_priv->id, &event);
1721         if (ret) {
1722                 /* Destroy the CM ID by returning a non-zero value. */
1723                 id_priv->cm_id.ib = NULL;
1724                 cma_exch(id_priv, RDMA_CM_DESTROYING);
1725                 mutex_unlock(&id_priv->handler_mutex);
1726                 rdma_destroy_id(&id_priv->id);
1727                 return ret;
1728         }
1729 out:
1730         mutex_unlock(&id_priv->handler_mutex);
1731         return ret;
1732 }
1733
1734 static struct rdma_id_private *cma_new_conn_id(struct rdma_cm_id *listen_id,
1735                                                struct ib_cm_event *ib_event,
1736                                                struct net_device *net_dev)
1737 {
1738         struct rdma_id_private *id_priv;
1739         struct rdma_cm_id *id;
1740         struct rdma_route *rt;
1741         const sa_family_t ss_family = listen_id->route.addr.src_addr.ss_family;
1742         const __be64 service_id =
1743                       ib_event->param.req_rcvd.primary_path->service_id;
1744         int ret;
1745
1746         id = rdma_create_id(listen_id->route.addr.dev_addr.net,
1747                             listen_id->event_handler, listen_id->context,
1748                             listen_id->ps, ib_event->param.req_rcvd.qp_type);
1749         if (IS_ERR(id))
1750                 return NULL;
1751
1752         id_priv = container_of(id, struct rdma_id_private, id);
1753         if (cma_save_net_info((struct sockaddr *)&id->route.addr.src_addr,
1754                               (struct sockaddr *)&id->route.addr.dst_addr,
1755                               listen_id, ib_event, ss_family, service_id))
1756                 goto err;
1757
1758         rt = &id->route;
1759         rt->num_paths = ib_event->param.req_rcvd.alternate_path ? 2 : 1;
1760         rt->path_rec = kmalloc(sizeof *rt->path_rec * rt->num_paths,
1761                                GFP_KERNEL);
1762         if (!rt->path_rec)
1763                 goto err;
1764
1765         rt->path_rec[0] = *ib_event->param.req_rcvd.primary_path;
1766         if (rt->num_paths == 2)
1767                 rt->path_rec[1] = *ib_event->param.req_rcvd.alternate_path;
1768
1769         if (net_dev) {
1770                 ret = rdma_copy_addr(&rt->addr.dev_addr, net_dev, NULL);
1771                 if (ret)
1772                         goto err;
1773         } else {
1774                 if (!cma_protocol_roce(listen_id) &&
1775                     cma_any_addr(cma_src_addr(id_priv))) {
1776                         rt->addr.dev_addr.dev_type = ARPHRD_INFINIBAND;
1777                         rdma_addr_set_sgid(&rt->addr.dev_addr, &rt->path_rec[0].sgid);
1778                         ib_addr_set_pkey(&rt->addr.dev_addr, be16_to_cpu(rt->path_rec[0].pkey));
1779                 } else if (!cma_any_addr(cma_src_addr(id_priv))) {
1780                         ret = cma_translate_addr(cma_src_addr(id_priv), &rt->addr.dev_addr);
1781                         if (ret)
1782                                 goto err;
1783                 }
1784         }
1785         rdma_addr_set_dgid(&rt->addr.dev_addr, &rt->path_rec[0].dgid);
1786
1787         id_priv->state = RDMA_CM_CONNECT;
1788         return id_priv;
1789
1790 err:
1791         rdma_destroy_id(id);
1792         return NULL;
1793 }
1794
1795 static struct rdma_id_private *cma_new_udp_id(struct rdma_cm_id *listen_id,
1796                                               struct ib_cm_event *ib_event,
1797                                               struct net_device *net_dev)
1798 {
1799         struct rdma_id_private *id_priv;
1800         struct rdma_cm_id *id;
1801         const sa_family_t ss_family = listen_id->route.addr.src_addr.ss_family;
1802         struct net *net = listen_id->route.addr.dev_addr.net;
1803         int ret;
1804
1805         id = rdma_create_id(net, listen_id->event_handler, listen_id->context,
1806                             listen_id->ps, IB_QPT_UD);
1807         if (IS_ERR(id))
1808                 return NULL;
1809
1810         id_priv = container_of(id, struct rdma_id_private, id);
1811         if (cma_save_net_info((struct sockaddr *)&id->route.addr.src_addr,
1812                               (struct sockaddr *)&id->route.addr.dst_addr,
1813                               listen_id, ib_event, ss_family,
1814                               ib_event->param.sidr_req_rcvd.service_id))
1815                 goto err;
1816
1817         if (net_dev) {
1818                 ret = rdma_copy_addr(&id->route.addr.dev_addr, net_dev, NULL);
1819                 if (ret)
1820                         goto err;
1821         } else {
1822                 if (!cma_any_addr(cma_src_addr(id_priv))) {
1823                         ret = cma_translate_addr(cma_src_addr(id_priv),
1824                                                  &id->route.addr.dev_addr);
1825                         if (ret)
1826                                 goto err;
1827                 }
1828         }
1829
1830         id_priv->state = RDMA_CM_CONNECT;
1831         return id_priv;
1832 err:
1833         rdma_destroy_id(id);
1834         return NULL;
1835 }
1836
1837 static void cma_set_req_event_data(struct rdma_cm_event *event,
1838                                    struct ib_cm_req_event_param *req_data,
1839                                    void *private_data, int offset)
1840 {
1841         event->param.conn.private_data = private_data + offset;
1842         event->param.conn.private_data_len = IB_CM_REQ_PRIVATE_DATA_SIZE - offset;
1843         event->param.conn.responder_resources = req_data->responder_resources;
1844         event->param.conn.initiator_depth = req_data->initiator_depth;
1845         event->param.conn.flow_control = req_data->flow_control;
1846         event->param.conn.retry_count = req_data->retry_count;
1847         event->param.conn.rnr_retry_count = req_data->rnr_retry_count;
1848         event->param.conn.srq = req_data->srq;
1849         event->param.conn.qp_num = req_data->remote_qpn;
1850 }
1851
1852 static int cma_check_req_qp_type(struct rdma_cm_id *id, struct ib_cm_event *ib_event)
1853 {
1854         return (((ib_event->event == IB_CM_REQ_RECEIVED) &&
1855                  (ib_event->param.req_rcvd.qp_type == id->qp_type)) ||
1856                 ((ib_event->event == IB_CM_SIDR_REQ_RECEIVED) &&
1857                  (id->qp_type == IB_QPT_UD)) ||
1858                 (!id->qp_type));
1859 }
1860
1861 static int cma_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
1862 {
1863         struct rdma_id_private *listen_id, *conn_id = NULL;
1864         struct rdma_cm_event event;
1865         struct net_device *net_dev;
1866         int offset, ret;
1867
1868         listen_id = cma_id_from_event(cm_id, ib_event, &net_dev);
1869         if (IS_ERR(listen_id))
1870                 return PTR_ERR(listen_id);
1871
1872         if (!cma_check_req_qp_type(&listen_id->id, ib_event)) {
1873                 ret = -EINVAL;
1874                 goto net_dev_put;
1875         }
1876
1877         mutex_lock(&listen_id->handler_mutex);
1878         if (listen_id->state != RDMA_CM_LISTEN) {
1879                 ret = -ECONNABORTED;
1880                 goto err1;
1881         }
1882
1883         memset(&event, 0, sizeof event);
1884         offset = cma_user_data_offset(listen_id);
1885         event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
1886         if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED) {
1887                 conn_id = cma_new_udp_id(&listen_id->id, ib_event, net_dev);
1888                 event.param.ud.private_data = ib_event->private_data + offset;
1889                 event.param.ud.private_data_len =
1890                                 IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE - offset;
1891         } else {
1892                 conn_id = cma_new_conn_id(&listen_id->id, ib_event, net_dev);
1893                 cma_set_req_event_data(&event, &ib_event->param.req_rcvd,
1894                                        ib_event->private_data, offset);
1895         }
1896         if (!conn_id) {
1897                 ret = -ENOMEM;
1898                 goto err1;
1899         }
1900
1901         mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
1902         ret = cma_acquire_dev(conn_id, listen_id);
1903         if (ret)
1904                 goto err2;
1905
1906         conn_id->cm_id.ib = cm_id;
1907         cm_id->context = conn_id;
1908         cm_id->cm_handler = cma_ib_handler;
1909
1910         /*
1911          * Protect against the user destroying conn_id from another thread
1912          * until we're done accessing it.
1913          */
1914         atomic_inc(&conn_id->refcount);
1915         ret = conn_id->id.event_handler(&conn_id->id, &event);
1916         if (ret)
1917                 goto err3;
1918         /*
1919          * Acquire mutex to prevent user executing rdma_destroy_id()
1920          * while we're accessing the cm_id.
1921          */
1922         mutex_lock(&lock);
1923         if (cma_comp(conn_id, RDMA_CM_CONNECT) &&
1924             (conn_id->id.qp_type != IB_QPT_UD))
1925                 ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
1926         mutex_unlock(&lock);
1927         mutex_unlock(&conn_id->handler_mutex);
1928         mutex_unlock(&listen_id->handler_mutex);
1929         cma_deref_id(conn_id);
1930         if (net_dev)
1931                 dev_put(net_dev);
1932         return 0;
1933
1934 err3:
1935         cma_deref_id(conn_id);
1936         /* Destroy the CM ID by returning a non-zero value. */
1937         conn_id->cm_id.ib = NULL;
1938 err2:
1939         cma_exch(conn_id, RDMA_CM_DESTROYING);
1940         mutex_unlock(&conn_id->handler_mutex);
1941 err1:
1942         mutex_unlock(&listen_id->handler_mutex);
1943         if (conn_id)
1944                 rdma_destroy_id(&conn_id->id);
1945
1946 net_dev_put:
1947         if (net_dev)
1948                 dev_put(net_dev);
1949
1950         return ret;
1951 }
1952
1953 __be64 rdma_get_service_id(struct rdma_cm_id *id, struct sockaddr *addr)
1954 {
1955         if (addr->sa_family == AF_IB)
1956                 return ((struct sockaddr_ib *) addr)->sib_sid;
1957
1958         return cpu_to_be64(((u64)id->ps << 16) + be16_to_cpu(cma_port(addr)));
1959 }
1960 EXPORT_SYMBOL(rdma_get_service_id);
1961
1962 static int cma_iw_handler(struct iw_cm_id *iw_id, struct iw_cm_event *iw_event)
1963 {
1964         struct rdma_id_private *id_priv = iw_id->context;
1965         struct rdma_cm_event event;
1966         int ret = 0;
1967         struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr;
1968         struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr;
1969
1970         mutex_lock(&id_priv->handler_mutex);
1971         if (id_priv->state != RDMA_CM_CONNECT)
1972                 goto out;
1973
1974         memset(&event, 0, sizeof event);
1975         switch (iw_event->event) {
1976         case IW_CM_EVENT_CLOSE:
1977                 event.event = RDMA_CM_EVENT_DISCONNECTED;
1978                 break;
1979         case IW_CM_EVENT_CONNECT_REPLY:
1980                 memcpy(cma_src_addr(id_priv), laddr,
1981                        rdma_addr_size(laddr));
1982                 memcpy(cma_dst_addr(id_priv), raddr,
1983                        rdma_addr_size(raddr));
1984                 switch (iw_event->status) {
1985                 case 0:
1986                         event.event = RDMA_CM_EVENT_ESTABLISHED;
1987                         event.param.conn.initiator_depth = iw_event->ird;
1988                         event.param.conn.responder_resources = iw_event->ord;
1989                         break;
1990                 case -ECONNRESET:
1991                 case -ECONNREFUSED:
1992                         event.event = RDMA_CM_EVENT_REJECTED;
1993                         break;
1994                 case -ETIMEDOUT:
1995                         event.event = RDMA_CM_EVENT_UNREACHABLE;
1996                         break;
1997                 default:
1998                         event.event = RDMA_CM_EVENT_CONNECT_ERROR;
1999                         break;
2000                 }
2001                 break;
2002         case IW_CM_EVENT_ESTABLISHED:
2003                 event.event = RDMA_CM_EVENT_ESTABLISHED;
2004                 event.param.conn.initiator_depth = iw_event->ird;
2005                 event.param.conn.responder_resources = iw_event->ord;
2006                 break;
2007         default:
2008                 BUG_ON(1);
2009         }
2010
2011         event.status = iw_event->status;
2012         event.param.conn.private_data = iw_event->private_data;
2013         event.param.conn.private_data_len = iw_event->private_data_len;
2014         ret = id_priv->id.event_handler(&id_priv->id, &event);
2015         if (ret) {
2016                 /* Destroy the CM ID by returning a non-zero value. */
2017                 id_priv->cm_id.iw = NULL;
2018                 cma_exch(id_priv, RDMA_CM_DESTROYING);
2019                 mutex_unlock(&id_priv->handler_mutex);
2020                 rdma_destroy_id(&id_priv->id);
2021                 return ret;
2022         }
2023
2024 out:
2025         mutex_unlock(&id_priv->handler_mutex);
2026         return ret;
2027 }
2028
2029 static int iw_conn_req_handler(struct iw_cm_id *cm_id,
2030                                struct iw_cm_event *iw_event)
2031 {
2032         struct rdma_cm_id *new_cm_id;
2033         struct rdma_id_private *listen_id, *conn_id;
2034         struct rdma_cm_event event;
2035         int ret = -ECONNABORTED;
2036         struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr;
2037         struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr;
2038
2039         listen_id = cm_id->context;
2040
2041         mutex_lock(&listen_id->handler_mutex);
2042         if (listen_id->state != RDMA_CM_LISTEN)
2043                 goto out;
2044
2045         /* Create a new RDMA id for the new IW CM ID */
2046         new_cm_id = rdma_create_id(listen_id->id.route.addr.dev_addr.net,
2047                                    listen_id->id.event_handler,
2048                                    listen_id->id.context,
2049                                    RDMA_PS_TCP, IB_QPT_RC);
2050         if (IS_ERR(new_cm_id)) {
2051                 ret = -ENOMEM;
2052                 goto out;
2053         }
2054         conn_id = container_of(new_cm_id, struct rdma_id_private, id);
2055         mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
2056         conn_id->state = RDMA_CM_CONNECT;
2057
2058         ret = rdma_translate_ip(laddr, &conn_id->id.route.addr.dev_addr, NULL);
2059         if (ret) {
2060                 mutex_unlock(&conn_id->handler_mutex);
2061                 rdma_destroy_id(new_cm_id);
2062                 goto out;
2063         }
2064
2065         ret = cma_acquire_dev(conn_id, listen_id);
2066         if (ret) {
2067                 mutex_unlock(&conn_id->handler_mutex);
2068                 rdma_destroy_id(new_cm_id);
2069                 goto out;
2070         }
2071
2072         conn_id->cm_id.iw = cm_id;
2073         cm_id->context = conn_id;
2074         cm_id->cm_handler = cma_iw_handler;
2075
2076         memcpy(cma_src_addr(conn_id), laddr, rdma_addr_size(laddr));
2077         memcpy(cma_dst_addr(conn_id), raddr, rdma_addr_size(raddr));
2078
2079         memset(&event, 0, sizeof event);
2080         event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
2081         event.param.conn.private_data = iw_event->private_data;
2082         event.param.conn.private_data_len = iw_event->private_data_len;
2083         event.param.conn.initiator_depth = iw_event->ird;
2084         event.param.conn.responder_resources = iw_event->ord;
2085
2086         /*
2087          * Protect against the user destroying conn_id from another thread
2088          * until we're done accessing it.
2089          */
2090         atomic_inc(&conn_id->refcount);
2091         ret = conn_id->id.event_handler(&conn_id->id, &event);
2092         if (ret) {
2093                 /* User wants to destroy the CM ID */
2094                 conn_id->cm_id.iw = NULL;
2095                 cma_exch(conn_id, RDMA_CM_DESTROYING);
2096                 mutex_unlock(&conn_id->handler_mutex);
2097                 cma_deref_id(conn_id);
2098                 rdma_destroy_id(&conn_id->id);
2099                 goto out;
2100         }
2101
2102         mutex_unlock(&conn_id->handler_mutex);
2103         cma_deref_id(conn_id);
2104
2105 out:
2106         mutex_unlock(&listen_id->handler_mutex);
2107         return ret;
2108 }
2109
2110 static int cma_ib_listen(struct rdma_id_private *id_priv)
2111 {
2112         struct sockaddr *addr;
2113         struct ib_cm_id *id;
2114         __be64 svc_id;
2115
2116         addr = cma_src_addr(id_priv);
2117         svc_id = rdma_get_service_id(&id_priv->id, addr);
2118         id = ib_cm_insert_listen(id_priv->id.device, cma_req_handler, svc_id);
2119         if (IS_ERR(id))
2120                 return PTR_ERR(id);
2121         id_priv->cm_id.ib = id;
2122
2123         return 0;
2124 }
2125
2126 static int cma_iw_listen(struct rdma_id_private *id_priv, int backlog)
2127 {
2128         int ret;
2129         struct iw_cm_id *id;
2130
2131         id = iw_create_cm_id(id_priv->id.device,
2132                              iw_conn_req_handler,
2133                              id_priv);
2134         if (IS_ERR(id))
2135                 return PTR_ERR(id);
2136
2137         id->tos = id_priv->tos;
2138         id_priv->cm_id.iw = id;
2139
2140         memcpy(&id_priv->cm_id.iw->local_addr, cma_src_addr(id_priv),
2141                rdma_addr_size(cma_src_addr(id_priv)));
2142
2143         ret = iw_cm_listen(id_priv->cm_id.iw, backlog);
2144
2145         if (ret) {
2146                 iw_destroy_cm_id(id_priv->cm_id.iw);
2147                 id_priv->cm_id.iw = NULL;
2148         }
2149
2150         return ret;
2151 }
2152
2153 static int cma_listen_handler(struct rdma_cm_id *id,
2154                               struct rdma_cm_event *event)
2155 {
2156         struct rdma_id_private *id_priv = id->context;
2157
2158         id->context = id_priv->id.context;
2159         id->event_handler = id_priv->id.event_handler;
2160         return id_priv->id.event_handler(id, event);
2161 }
2162
2163 static void cma_listen_on_dev(struct rdma_id_private *id_priv,
2164                               struct cma_device *cma_dev)
2165 {
2166         struct rdma_id_private *dev_id_priv;
2167         struct rdma_cm_id *id;
2168         struct net *net = id_priv->id.route.addr.dev_addr.net;
2169         int ret;
2170
2171         if (cma_family(id_priv) == AF_IB && !rdma_cap_ib_cm(cma_dev->device, 1))
2172                 return;
2173
2174         id = rdma_create_id(net, cma_listen_handler, id_priv, id_priv->id.ps,
2175                             id_priv->id.qp_type);
2176         if (IS_ERR(id))
2177                 return;
2178
2179         dev_id_priv = container_of(id, struct rdma_id_private, id);
2180
2181         dev_id_priv->state = RDMA_CM_ADDR_BOUND;
2182         memcpy(cma_src_addr(dev_id_priv), cma_src_addr(id_priv),
2183                rdma_addr_size(cma_src_addr(id_priv)));
2184
2185         _cma_attach_to_dev(dev_id_priv, cma_dev);
2186         list_add_tail(&dev_id_priv->listen_list, &id_priv->listen_list);
2187         atomic_inc(&id_priv->refcount);
2188         dev_id_priv->internal_id = 1;
2189         dev_id_priv->afonly = id_priv->afonly;
2190
2191         ret = rdma_listen(id, id_priv->backlog);
2192         if (ret)
2193                 pr_warn("RDMA CMA: cma_listen_on_dev, error %d, listening on device %s\n",
2194                         ret, cma_dev->device->name);
2195 }
2196
2197 static void cma_listen_on_all(struct rdma_id_private *id_priv)
2198 {
2199         struct cma_device *cma_dev;
2200
2201         mutex_lock(&lock);
2202         list_add_tail(&id_priv->list, &listen_any_list);
2203         list_for_each_entry(cma_dev, &dev_list, list)
2204                 cma_listen_on_dev(id_priv, cma_dev);
2205         mutex_unlock(&lock);
2206 }
2207
2208 void rdma_set_service_type(struct rdma_cm_id *id, int tos)
2209 {
2210         struct rdma_id_private *id_priv;
2211
2212         id_priv = container_of(id, struct rdma_id_private, id);
2213         id_priv->tos = (u8) tos;
2214 }
2215 EXPORT_SYMBOL(rdma_set_service_type);
2216
2217 static void cma_query_handler(int status, struct ib_sa_path_rec *path_rec,
2218                               void *context)
2219 {
2220         struct cma_work *work = context;
2221         struct rdma_route *route;
2222
2223         route = &work->id->id.route;
2224
2225         if (!status) {
2226                 route->num_paths = 1;
2227                 *route->path_rec = *path_rec;
2228         } else {
2229                 work->old_state = RDMA_CM_ROUTE_QUERY;
2230                 work->new_state = RDMA_CM_ADDR_RESOLVED;
2231                 work->event.event = RDMA_CM_EVENT_ROUTE_ERROR;
2232                 work->event.status = status;
2233         }
2234
2235         queue_work(cma_wq, &work->work);
2236 }
2237
2238 static int cma_query_ib_route(struct rdma_id_private *id_priv, int timeout_ms,
2239                               struct cma_work *work)
2240 {
2241         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
2242         struct ib_sa_path_rec path_rec;
2243         ib_sa_comp_mask comp_mask;
2244         struct sockaddr_in6 *sin6;
2245         struct sockaddr_ib *sib;
2246
2247         memset(&path_rec, 0, sizeof path_rec);
2248         rdma_addr_get_sgid(dev_addr, &path_rec.sgid);
2249         rdma_addr_get_dgid(dev_addr, &path_rec.dgid);
2250         path_rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
2251         path_rec.numb_path = 1;
2252         path_rec.reversible = 1;
2253         path_rec.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
2254
2255         comp_mask = IB_SA_PATH_REC_DGID | IB_SA_PATH_REC_SGID |
2256                     IB_SA_PATH_REC_PKEY | IB_SA_PATH_REC_NUMB_PATH |
2257                     IB_SA_PATH_REC_REVERSIBLE | IB_SA_PATH_REC_SERVICE_ID;
2258
2259         switch (cma_family(id_priv)) {
2260         case AF_INET:
2261                 path_rec.qos_class = cpu_to_be16((u16) id_priv->tos);
2262                 comp_mask |= IB_SA_PATH_REC_QOS_CLASS;
2263                 break;
2264         case AF_INET6:
2265                 sin6 = (struct sockaddr_in6 *) cma_src_addr(id_priv);
2266                 path_rec.traffic_class = (u8) (be32_to_cpu(sin6->sin6_flowinfo) >> 20);
2267                 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
2268                 break;
2269         case AF_IB:
2270                 sib = (struct sockaddr_ib *) cma_src_addr(id_priv);
2271                 path_rec.traffic_class = (u8) (be32_to_cpu(sib->sib_flowinfo) >> 20);
2272                 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
2273                 break;
2274         }
2275
2276         id_priv->query_id = ib_sa_path_rec_get(&sa_client, id_priv->id.device,
2277                                                id_priv->id.port_num, &path_rec,
2278                                                comp_mask, timeout_ms,
2279                                                GFP_KERNEL, cma_query_handler,
2280                                                work, &id_priv->query);
2281
2282         return (id_priv->query_id < 0) ? id_priv->query_id : 0;
2283 }
2284
2285 static void cma_work_handler(struct work_struct *_work)
2286 {
2287         struct cma_work *work = container_of(_work, struct cma_work, work);
2288         struct rdma_id_private *id_priv = work->id;
2289         int destroy = 0;
2290
2291         mutex_lock(&id_priv->handler_mutex);
2292         if (!cma_comp_exch(id_priv, work->old_state, work->new_state))
2293                 goto out;
2294
2295         if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
2296                 cma_exch(id_priv, RDMA_CM_DESTROYING);
2297                 destroy = 1;
2298         }
2299 out:
2300         mutex_unlock(&id_priv->handler_mutex);
2301         cma_deref_id(id_priv);
2302         if (destroy)
2303                 rdma_destroy_id(&id_priv->id);
2304         kfree(work);
2305 }
2306
2307 static void cma_ndev_work_handler(struct work_struct *_work)
2308 {
2309         struct cma_ndev_work *work = container_of(_work, struct cma_ndev_work, work);
2310         struct rdma_id_private *id_priv = work->id;
2311         int destroy = 0;
2312
2313         mutex_lock(&id_priv->handler_mutex);
2314         if (id_priv->state == RDMA_CM_DESTROYING ||
2315             id_priv->state == RDMA_CM_DEVICE_REMOVAL)
2316                 goto out;
2317
2318         if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
2319                 cma_exch(id_priv, RDMA_CM_DESTROYING);
2320                 destroy = 1;
2321         }
2322
2323 out:
2324         mutex_unlock(&id_priv->handler_mutex);
2325         cma_deref_id(id_priv);
2326         if (destroy)
2327                 rdma_destroy_id(&id_priv->id);
2328         kfree(work);
2329 }
2330
2331 static int cma_resolve_ib_route(struct rdma_id_private *id_priv, int timeout_ms)
2332 {
2333         struct rdma_route *route = &id_priv->id.route;
2334         struct cma_work *work;
2335         int ret;
2336
2337         work = kzalloc(sizeof *work, GFP_KERNEL);
2338         if (!work)
2339                 return -ENOMEM;
2340
2341         work->id = id_priv;
2342         INIT_WORK(&work->work, cma_work_handler);
2343         work->old_state = RDMA_CM_ROUTE_QUERY;
2344         work->new_state = RDMA_CM_ROUTE_RESOLVED;
2345         work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
2346
2347         route->path_rec = kmalloc(sizeof *route->path_rec, GFP_KERNEL);
2348         if (!route->path_rec) {
2349                 ret = -ENOMEM;
2350                 goto err1;
2351         }
2352
2353         ret = cma_query_ib_route(id_priv, timeout_ms, work);
2354         if (ret)
2355                 goto err2;
2356
2357         return 0;
2358 err2:
2359         kfree(route->path_rec);
2360         route->path_rec = NULL;
2361 err1:
2362         kfree(work);
2363         return ret;
2364 }
2365
2366 int rdma_set_ib_paths(struct rdma_cm_id *id,
2367                       struct ib_sa_path_rec *path_rec, int num_paths)
2368 {
2369         struct rdma_id_private *id_priv;
2370         int ret;
2371
2372         id_priv = container_of(id, struct rdma_id_private, id);
2373         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
2374                            RDMA_CM_ROUTE_RESOLVED))
2375                 return -EINVAL;
2376
2377         id->route.path_rec = kmemdup(path_rec, sizeof *path_rec * num_paths,
2378                                      GFP_KERNEL);
2379         if (!id->route.path_rec) {
2380                 ret = -ENOMEM;
2381                 goto err;
2382         }
2383
2384         id->route.num_paths = num_paths;
2385         return 0;
2386 err:
2387         cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_ADDR_RESOLVED);
2388         return ret;
2389 }
2390 EXPORT_SYMBOL(rdma_set_ib_paths);
2391
2392 static int cma_resolve_iw_route(struct rdma_id_private *id_priv, int timeout_ms)
2393 {
2394         struct cma_work *work;
2395
2396         work = kzalloc(sizeof *work, GFP_KERNEL);
2397         if (!work)
2398                 return -ENOMEM;
2399
2400         work->id = id_priv;
2401         INIT_WORK(&work->work, cma_work_handler);
2402         work->old_state = RDMA_CM_ROUTE_QUERY;
2403         work->new_state = RDMA_CM_ROUTE_RESOLVED;
2404         work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
2405         queue_work(cma_wq, &work->work);
2406         return 0;
2407 }
2408
2409 static int iboe_tos_to_sl(struct net_device *ndev, int tos)
2410 {
2411         int prio;
2412         struct net_device *dev;
2413
2414         prio = rt_tos2priority(tos);
2415         dev = ndev->priv_flags & IFF_802_1Q_VLAN ?
2416                 vlan_dev_real_dev(ndev) : ndev;
2417
2418         if (dev->num_tc)
2419                 return netdev_get_prio_tc_map(dev, prio);
2420
2421 #if IS_ENABLED(CONFIG_VLAN_8021Q)
2422         if (ndev->priv_flags & IFF_802_1Q_VLAN)
2423                 return (vlan_dev_get_egress_qos_mask(ndev, prio) &
2424                         VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
2425 #endif
2426         return 0;
2427 }
2428
2429 static int cma_resolve_iboe_route(struct rdma_id_private *id_priv)
2430 {
2431         struct rdma_route *route = &id_priv->id.route;
2432         struct rdma_addr *addr = &route->addr;
2433         struct cma_work *work;
2434         int ret;
2435         struct net_device *ndev = NULL;
2436
2437
2438         work = kzalloc(sizeof *work, GFP_KERNEL);
2439         if (!work)
2440                 return -ENOMEM;
2441
2442         work->id = id_priv;
2443         INIT_WORK(&work->work, cma_work_handler);
2444
2445         route->path_rec = kzalloc(sizeof *route->path_rec, GFP_KERNEL);
2446         if (!route->path_rec) {
2447                 ret = -ENOMEM;
2448                 goto err1;
2449         }
2450
2451         route->num_paths = 1;
2452
2453         if (addr->dev_addr.bound_dev_if) {
2454                 ndev = dev_get_by_index(&init_net, addr->dev_addr.bound_dev_if);
2455                 if (!ndev)
2456                         return -ENODEV;
2457
2458                 if (ndev->flags & IFF_LOOPBACK) {
2459                         dev_put(ndev);
2460                         if (!id_priv->id.device->get_netdev)
2461                                 return -EOPNOTSUPP;
2462
2463                         ndev = id_priv->id.device->get_netdev(id_priv->id.device,
2464                                                               id_priv->id.port_num);
2465                         if (!ndev)
2466                                 return -ENODEV;
2467                 }
2468
2469                 route->path_rec->net = &init_net;
2470                 route->path_rec->ifindex = ndev->ifindex;
2471                 route->path_rec->gid_type = id_priv->gid_type;
2472         }
2473         if (!ndev) {
2474                 ret = -ENODEV;
2475                 goto err2;
2476         }
2477
2478         memcpy(route->path_rec->dmac, addr->dev_addr.dst_dev_addr, ETH_ALEN);
2479
2480         rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
2481                     &route->path_rec->sgid);
2482         rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.dst_addr,
2483                     &route->path_rec->dgid);
2484
2485         /* Use the hint from IP Stack to select GID Type */
2486         if (route->path_rec->gid_type < ib_network_to_gid_type(addr->dev_addr.network))
2487                 route->path_rec->gid_type = ib_network_to_gid_type(addr->dev_addr.network);
2488         if (((struct sockaddr *)&id_priv->id.route.addr.dst_addr)->sa_family != AF_IB)
2489                 /* TODO: get the hoplimit from the inet/inet6 device */
2490                 route->path_rec->hop_limit = addr->dev_addr.hoplimit;
2491         else
2492                 route->path_rec->hop_limit = 1;
2493         route->path_rec->reversible = 1;
2494         route->path_rec->pkey = cpu_to_be16(0xffff);
2495         route->path_rec->mtu_selector = IB_SA_EQ;
2496         route->path_rec->sl = iboe_tos_to_sl(ndev, id_priv->tos);
2497         route->path_rec->mtu = iboe_get_mtu(ndev->mtu);
2498         route->path_rec->rate_selector = IB_SA_EQ;
2499         route->path_rec->rate = iboe_get_rate(ndev);
2500         dev_put(ndev);
2501         route->path_rec->packet_life_time_selector = IB_SA_EQ;
2502         route->path_rec->packet_life_time = CMA_IBOE_PACKET_LIFETIME;
2503         if (!route->path_rec->mtu) {
2504                 ret = -EINVAL;
2505                 goto err2;
2506         }
2507
2508         work->old_state = RDMA_CM_ROUTE_QUERY;
2509         work->new_state = RDMA_CM_ROUTE_RESOLVED;
2510         work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
2511         work->event.status = 0;
2512
2513         queue_work(cma_wq, &work->work);
2514
2515         return 0;
2516
2517 err2:
2518         kfree(route->path_rec);
2519         route->path_rec = NULL;
2520 err1:
2521         kfree(work);
2522         return ret;
2523 }
2524
2525 int rdma_resolve_route(struct rdma_cm_id *id, int timeout_ms)
2526 {
2527         struct rdma_id_private *id_priv;
2528         int ret;
2529
2530         id_priv = container_of(id, struct rdma_id_private, id);
2531         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED, RDMA_CM_ROUTE_QUERY))
2532                 return -EINVAL;
2533
2534         atomic_inc(&id_priv->refcount);
2535         if (rdma_cap_ib_sa(id->device, id->port_num))
2536                 ret = cma_resolve_ib_route(id_priv, timeout_ms);
2537         else if (rdma_protocol_roce(id->device, id->port_num))
2538                 ret = cma_resolve_iboe_route(id_priv);
2539         else if (rdma_protocol_iwarp(id->device, id->port_num))
2540                 ret = cma_resolve_iw_route(id_priv, timeout_ms);
2541         else
2542                 ret = -ENOSYS;
2543
2544         if (ret)
2545                 goto err;
2546
2547         return 0;
2548 err:
2549         cma_comp_exch(id_priv, RDMA_CM_ROUTE_QUERY, RDMA_CM_ADDR_RESOLVED);
2550         cma_deref_id(id_priv);
2551         return ret;
2552 }
2553 EXPORT_SYMBOL(rdma_resolve_route);
2554
2555 static void cma_set_loopback(struct sockaddr *addr)
2556 {
2557         switch (addr->sa_family) {
2558         case AF_INET:
2559                 ((struct sockaddr_in *) addr)->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
2560                 break;
2561         case AF_INET6:
2562                 ipv6_addr_set(&((struct sockaddr_in6 *) addr)->sin6_addr,
2563                               0, 0, 0, htonl(1));
2564                 break;
2565         default:
2566                 ib_addr_set(&((struct sockaddr_ib *) addr)->sib_addr,
2567                             0, 0, 0, htonl(1));
2568                 break;
2569         }
2570 }
2571
2572 static int cma_bind_loopback(struct rdma_id_private *id_priv)
2573 {
2574         struct cma_device *cma_dev, *cur_dev;
2575         struct ib_port_attr port_attr;
2576         union ib_gid gid;
2577         u16 pkey;
2578         int ret;
2579         u8 p;
2580
2581         cma_dev = NULL;
2582         mutex_lock(&lock);
2583         list_for_each_entry(cur_dev, &dev_list, list) {
2584                 if (cma_family(id_priv) == AF_IB &&
2585                     !rdma_cap_ib_cm(cur_dev->device, 1))
2586                         continue;
2587
2588                 if (!cma_dev)
2589                         cma_dev = cur_dev;
2590
2591                 for (p = 1; p <= cur_dev->device->phys_port_cnt; ++p) {
2592                         if (!ib_query_port(cur_dev->device, p, &port_attr) &&
2593                             port_attr.state == IB_PORT_ACTIVE) {
2594                                 cma_dev = cur_dev;
2595                                 goto port_found;
2596                         }
2597                 }
2598         }
2599
2600         if (!cma_dev) {
2601                 ret = -ENODEV;
2602                 goto out;
2603         }
2604
2605         p = 1;
2606
2607 port_found:
2608         ret = ib_get_cached_gid(cma_dev->device, p, 0, &gid, NULL);
2609         if (ret)
2610                 goto out;
2611
2612         ret = ib_get_cached_pkey(cma_dev->device, p, 0, &pkey);
2613         if (ret)
2614                 goto out;
2615
2616         id_priv->id.route.addr.dev_addr.dev_type =
2617                 (rdma_protocol_ib(cma_dev->device, p)) ?
2618                 ARPHRD_INFINIBAND : ARPHRD_ETHER;
2619
2620         rdma_addr_set_sgid(&id_priv->id.route.addr.dev_addr, &gid);
2621         ib_addr_set_pkey(&id_priv->id.route.addr.dev_addr, pkey);
2622         id_priv->id.port_num = p;
2623         cma_attach_to_dev(id_priv, cma_dev);
2624         cma_set_loopback(cma_src_addr(id_priv));
2625 out:
2626         mutex_unlock(&lock);
2627         return ret;
2628 }
2629
2630 static void addr_handler(int status, struct sockaddr *src_addr,
2631                          struct rdma_dev_addr *dev_addr, void *context)
2632 {
2633         struct rdma_id_private *id_priv = context;
2634         struct rdma_cm_event event;
2635
2636         memset(&event, 0, sizeof event);
2637         mutex_lock(&id_priv->handler_mutex);
2638         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY,
2639                            RDMA_CM_ADDR_RESOLVED))
2640                 goto out;
2641
2642         memcpy(cma_src_addr(id_priv), src_addr, rdma_addr_size(src_addr));
2643         if (!status && !id_priv->cma_dev)
2644                 status = cma_acquire_dev(id_priv, NULL);
2645
2646         if (status) {
2647                 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
2648                                    RDMA_CM_ADDR_BOUND))
2649                         goto out;
2650                 event.event = RDMA_CM_EVENT_ADDR_ERROR;
2651                 event.status = status;
2652         } else
2653                 event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
2654
2655         if (id_priv->id.event_handler(&id_priv->id, &event)) {
2656                 cma_exch(id_priv, RDMA_CM_DESTROYING);
2657                 mutex_unlock(&id_priv->handler_mutex);
2658                 cma_deref_id(id_priv);
2659                 rdma_destroy_id(&id_priv->id);
2660                 return;
2661         }
2662 out:
2663         mutex_unlock(&id_priv->handler_mutex);
2664         cma_deref_id(id_priv);
2665 }
2666
2667 static int cma_resolve_loopback(struct rdma_id_private *id_priv)
2668 {
2669         struct cma_work *work;
2670         union ib_gid gid;
2671         int ret;
2672
2673         work = kzalloc(sizeof *work, GFP_KERNEL);
2674         if (!work)
2675                 return -ENOMEM;
2676
2677         if (!id_priv->cma_dev) {
2678                 ret = cma_bind_loopback(id_priv);
2679                 if (ret)
2680                         goto err;
2681         }
2682
2683         rdma_addr_get_sgid(&id_priv->id.route.addr.dev_addr, &gid);
2684         rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, &gid);
2685
2686         work->id = id_priv;
2687         INIT_WORK(&work->work, cma_work_handler);
2688         work->old_state = RDMA_CM_ADDR_QUERY;
2689         work->new_state = RDMA_CM_ADDR_RESOLVED;
2690         work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
2691         queue_work(cma_wq, &work->work);
2692         return 0;
2693 err:
2694         kfree(work);
2695         return ret;
2696 }
2697
2698 static int cma_resolve_ib_addr(struct rdma_id_private *id_priv)
2699 {
2700         struct cma_work *work;
2701         int ret;
2702
2703         work = kzalloc(sizeof *work, GFP_KERNEL);
2704         if (!work)
2705                 return -ENOMEM;
2706
2707         if (!id_priv->cma_dev) {
2708                 ret = cma_resolve_ib_dev(id_priv);
2709                 if (ret)
2710                         goto err;
2711         }
2712
2713         rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, (union ib_gid *)
2714                 &(((struct sockaddr_ib *) &id_priv->id.route.addr.dst_addr)->sib_addr));
2715
2716         work->id = id_priv;
2717         INIT_WORK(&work->work, cma_work_handler);
2718         work->old_state = RDMA_CM_ADDR_QUERY;
2719         work->new_state = RDMA_CM_ADDR_RESOLVED;
2720         work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
2721         queue_work(cma_wq, &work->work);
2722         return 0;
2723 err:
2724         kfree(work);
2725         return ret;
2726 }
2727
2728 static int cma_bind_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
2729                          struct sockaddr *dst_addr)
2730 {
2731         if (!src_addr || !src_addr->sa_family) {
2732                 src_addr = (struct sockaddr *) &id->route.addr.src_addr;
2733                 src_addr->sa_family = dst_addr->sa_family;
2734                 if (dst_addr->sa_family == AF_INET6) {
2735                         struct sockaddr_in6 *src_addr6 = (struct sockaddr_in6 *) src_addr;
2736                         struct sockaddr_in6 *dst_addr6 = (struct sockaddr_in6 *) dst_addr;
2737                         src_addr6->sin6_scope_id = dst_addr6->sin6_scope_id;
2738                         if (ipv6_addr_type(&dst_addr6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
2739                                 id->route.addr.dev_addr.bound_dev_if = dst_addr6->sin6_scope_id;
2740                 } else if (dst_addr->sa_family == AF_IB) {
2741                         ((struct sockaddr_ib *) src_addr)->sib_pkey =
2742                                 ((struct sockaddr_ib *) dst_addr)->sib_pkey;
2743                 }
2744         }
2745         return rdma_bind_addr(id, src_addr);
2746 }
2747
2748 int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
2749                       struct sockaddr *dst_addr, int timeout_ms)
2750 {
2751         struct rdma_id_private *id_priv;
2752         int ret;
2753
2754         id_priv = container_of(id, struct rdma_id_private, id);
2755         if (id_priv->state == RDMA_CM_IDLE) {
2756                 ret = cma_bind_addr(id, src_addr, dst_addr);
2757                 if (ret)
2758                         return ret;
2759         }
2760
2761         if (cma_family(id_priv) != dst_addr->sa_family)
2762                 return -EINVAL;
2763
2764         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_ADDR_QUERY))
2765                 return -EINVAL;
2766
2767         atomic_inc(&id_priv->refcount);
2768         memcpy(cma_dst_addr(id_priv), dst_addr, rdma_addr_size(dst_addr));
2769         if (cma_any_addr(dst_addr)) {
2770                 ret = cma_resolve_loopback(id_priv);
2771         } else {
2772                 if (dst_addr->sa_family == AF_IB) {
2773                         ret = cma_resolve_ib_addr(id_priv);
2774                 } else {
2775                         ret = rdma_resolve_ip(&addr_client, cma_src_addr(id_priv),
2776                                               dst_addr, &id->route.addr.dev_addr,
2777                                               timeout_ms, addr_handler, id_priv);
2778                 }
2779         }
2780         if (ret)
2781                 goto err;
2782
2783         return 0;
2784 err:
2785         cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY, RDMA_CM_ADDR_BOUND);
2786         cma_deref_id(id_priv);
2787         return ret;
2788 }
2789 EXPORT_SYMBOL(rdma_resolve_addr);
2790
2791 int rdma_set_reuseaddr(struct rdma_cm_id *id, int reuse)
2792 {
2793         struct rdma_id_private *id_priv;
2794         unsigned long flags;
2795         int ret;
2796
2797         id_priv = container_of(id, struct rdma_id_private, id);
2798         spin_lock_irqsave(&id_priv->lock, flags);
2799         if (reuse || id_priv->state == RDMA_CM_IDLE) {
2800                 id_priv->reuseaddr = reuse;
2801                 ret = 0;
2802         } else {
2803                 ret = -EINVAL;
2804         }
2805         spin_unlock_irqrestore(&id_priv->lock, flags);
2806         return ret;
2807 }
2808 EXPORT_SYMBOL(rdma_set_reuseaddr);
2809
2810 int rdma_set_afonly(struct rdma_cm_id *id, int afonly)
2811 {
2812         struct rdma_id_private *id_priv;
2813         unsigned long flags;
2814         int ret;
2815
2816         id_priv = container_of(id, struct rdma_id_private, id);
2817         spin_lock_irqsave(&id_priv->lock, flags);
2818         if (id_priv->state == RDMA_CM_IDLE || id_priv->state == RDMA_CM_ADDR_BOUND) {
2819                 id_priv->options |= (1 << CMA_OPTION_AFONLY);
2820                 id_priv->afonly = afonly;
2821                 ret = 0;
2822         } else {
2823                 ret = -EINVAL;
2824         }
2825         spin_unlock_irqrestore(&id_priv->lock, flags);
2826         return ret;
2827 }
2828 EXPORT_SYMBOL(rdma_set_afonly);
2829
2830 static void cma_bind_port(struct rdma_bind_list *bind_list,
2831                           struct rdma_id_private *id_priv)
2832 {
2833         struct sockaddr *addr;
2834         struct sockaddr_ib *sib;
2835         u64 sid, mask;
2836         __be16 port;
2837
2838         addr = cma_src_addr(id_priv);
2839         port = htons(bind_list->port);
2840
2841         switch (addr->sa_family) {
2842         case AF_INET:
2843                 ((struct sockaddr_in *) addr)->sin_port = port;
2844                 break;
2845         case AF_INET6:
2846                 ((struct sockaddr_in6 *) addr)->sin6_port = port;
2847                 break;
2848         case AF_IB:
2849                 sib = (struct sockaddr_ib *) addr;
2850                 sid = be64_to_cpu(sib->sib_sid);
2851                 mask = be64_to_cpu(sib->sib_sid_mask);
2852                 sib->sib_sid = cpu_to_be64((sid & mask) | (u64) ntohs(port));
2853                 sib->sib_sid_mask = cpu_to_be64(~0ULL);
2854                 break;
2855         }
2856         id_priv->bind_list = bind_list;
2857         hlist_add_head(&id_priv->node, &bind_list->owners);
2858 }
2859
2860 static int cma_alloc_port(enum rdma_port_space ps,
2861                           struct rdma_id_private *id_priv, unsigned short snum)
2862 {
2863         struct rdma_bind_list *bind_list;
2864         int ret;
2865
2866         bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL);
2867         if (!bind_list)
2868                 return -ENOMEM;
2869
2870         ret = cma_ps_alloc(id_priv->id.route.addr.dev_addr.net, ps, bind_list,
2871                            snum);
2872         if (ret < 0)
2873                 goto err;
2874
2875         bind_list->ps = ps;
2876         bind_list->port = (unsigned short)ret;
2877         cma_bind_port(bind_list, id_priv);
2878         return 0;
2879 err:
2880         kfree(bind_list);
2881         return ret == -ENOSPC ? -EADDRNOTAVAIL : ret;
2882 }
2883
2884 static int cma_alloc_any_port(enum rdma_port_space ps,
2885                               struct rdma_id_private *id_priv)
2886 {
2887         static unsigned int last_used_port;
2888         int low, high, remaining;
2889         unsigned int rover;
2890         struct net *net = id_priv->id.route.addr.dev_addr.net;
2891
2892         inet_get_local_port_range(net, &low, &high);
2893         remaining = (high - low) + 1;
2894         rover = prandom_u32() % remaining + low;
2895 retry:
2896         if (last_used_port != rover &&
2897             !cma_ps_find(net, ps, (unsigned short)rover)) {
2898                 int ret = cma_alloc_port(ps, id_priv, rover);
2899                 /*
2900                  * Remember previously used port number in order to avoid
2901                  * re-using same port immediately after it is closed.
2902                  */
2903                 if (!ret)
2904                         last_used_port = rover;
2905                 if (ret != -EADDRNOTAVAIL)
2906                         return ret;
2907         }
2908         if (--remaining) {
2909                 rover++;
2910                 if ((rover < low) || (rover > high))
2911                         rover = low;
2912                 goto retry;
2913         }
2914         return -EADDRNOTAVAIL;
2915 }
2916
2917 /*
2918  * Check that the requested port is available.  This is called when trying to
2919  * bind to a specific port, or when trying to listen on a bound port.  In
2920  * the latter case, the provided id_priv may already be on the bind_list, but
2921  * we still need to check that it's okay to start listening.
2922  */
2923 static int cma_check_port(struct rdma_bind_list *bind_list,
2924                           struct rdma_id_private *id_priv, uint8_t reuseaddr)
2925 {
2926         struct rdma_id_private *cur_id;
2927         struct sockaddr *addr, *cur_addr;
2928
2929         addr = cma_src_addr(id_priv);
2930         hlist_for_each_entry(cur_id, &bind_list->owners, node) {
2931                 if (id_priv == cur_id)
2932                         continue;
2933
2934                 if ((cur_id->state != RDMA_CM_LISTEN) && reuseaddr &&
2935                     cur_id->reuseaddr)
2936                         continue;
2937
2938                 cur_addr = cma_src_addr(cur_id);
2939                 if (id_priv->afonly && cur_id->afonly &&
2940                     (addr->sa_family != cur_addr->sa_family))
2941                         continue;
2942
2943                 if (cma_any_addr(addr) || cma_any_addr(cur_addr))
2944                         return -EADDRNOTAVAIL;
2945
2946                 if (!cma_addr_cmp(addr, cur_addr))
2947                         return -EADDRINUSE;
2948         }
2949         return 0;
2950 }
2951
2952 static int cma_use_port(enum rdma_port_space ps,
2953                         struct rdma_id_private *id_priv)
2954 {
2955         struct rdma_bind_list *bind_list;
2956         unsigned short snum;
2957         int ret;
2958
2959         snum = ntohs(cma_port(cma_src_addr(id_priv)));
2960         if (snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
2961                 return -EACCES;
2962
2963         bind_list = cma_ps_find(id_priv->id.route.addr.dev_addr.net, ps, snum);
2964         if (!bind_list) {
2965                 ret = cma_alloc_port(ps, id_priv, snum);
2966         } else {
2967                 ret = cma_check_port(bind_list, id_priv, id_priv->reuseaddr);
2968                 if (!ret)
2969                         cma_bind_port(bind_list, id_priv);
2970         }
2971         return ret;
2972 }
2973
2974 static int cma_bind_listen(struct rdma_id_private *id_priv)
2975 {
2976         struct rdma_bind_list *bind_list = id_priv->bind_list;
2977         int ret = 0;
2978
2979         mutex_lock(&lock);
2980         if (bind_list->owners.first->next)
2981                 ret = cma_check_port(bind_list, id_priv, 0);
2982         mutex_unlock(&lock);
2983         return ret;
2984 }
2985
2986 static enum rdma_port_space cma_select_inet_ps(
2987                 struct rdma_id_private *id_priv)
2988 {
2989         switch (id_priv->id.ps) {
2990         case RDMA_PS_TCP:
2991         case RDMA_PS_UDP:
2992         case RDMA_PS_IPOIB:
2993         case RDMA_PS_IB:
2994                 return id_priv->id.ps;
2995         default:
2996
2997                 return 0;
2998         }
2999 }
3000
3001 static enum rdma_port_space cma_select_ib_ps(struct rdma_id_private *id_priv)
3002 {
3003         enum rdma_port_space ps = 0;
3004         struct sockaddr_ib *sib;
3005         u64 sid_ps, mask, sid;
3006
3007         sib = (struct sockaddr_ib *) cma_src_addr(id_priv);
3008         mask = be64_to_cpu(sib->sib_sid_mask) & RDMA_IB_IP_PS_MASK;
3009         sid = be64_to_cpu(sib->sib_sid) & mask;
3010
3011         if ((id_priv->id.ps == RDMA_PS_IB) && (sid == (RDMA_IB_IP_PS_IB & mask))) {
3012                 sid_ps = RDMA_IB_IP_PS_IB;
3013                 ps = RDMA_PS_IB;
3014         } else if (((id_priv->id.ps == RDMA_PS_IB) || (id_priv->id.ps == RDMA_PS_TCP)) &&
3015                    (sid == (RDMA_IB_IP_PS_TCP & mask))) {
3016                 sid_ps = RDMA_IB_IP_PS_TCP;
3017                 ps = RDMA_PS_TCP;
3018         } else if (((id_priv->id.ps == RDMA_PS_IB) || (id_priv->id.ps == RDMA_PS_UDP)) &&
3019                    (sid == (RDMA_IB_IP_PS_UDP & mask))) {
3020                 sid_ps = RDMA_IB_IP_PS_UDP;
3021                 ps = RDMA_PS_UDP;
3022         }
3023
3024         if (ps) {
3025                 sib->sib_sid = cpu_to_be64(sid_ps | ntohs(cma_port((struct sockaddr *) sib)));
3026                 sib->sib_sid_mask = cpu_to_be64(RDMA_IB_IP_PS_MASK |
3027                                                 be64_to_cpu(sib->sib_sid_mask));
3028         }
3029         return ps;
3030 }
3031
3032 static int cma_get_port(struct rdma_id_private *id_priv)
3033 {
3034         enum rdma_port_space ps;
3035         int ret;
3036
3037         if (cma_family(id_priv) != AF_IB)
3038                 ps = cma_select_inet_ps(id_priv);
3039         else
3040                 ps = cma_select_ib_ps(id_priv);
3041         if (!ps)
3042                 return -EPROTONOSUPPORT;
3043
3044         mutex_lock(&lock);
3045         if (cma_any_port(cma_src_addr(id_priv)))
3046                 ret = cma_alloc_any_port(ps, id_priv);
3047         else
3048                 ret = cma_use_port(ps, id_priv);
3049         mutex_unlock(&lock);
3050
3051         return ret;
3052 }
3053
3054 static int cma_check_linklocal(struct rdma_dev_addr *dev_addr,
3055                                struct sockaddr *addr)
3056 {
3057 #if IS_ENABLED(CONFIG_IPV6)
3058         struct sockaddr_in6 *sin6;
3059
3060         if (addr->sa_family != AF_INET6)
3061                 return 0;
3062
3063         sin6 = (struct sockaddr_in6 *) addr;
3064
3065         if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
3066                 return 0;
3067
3068         if (!sin6->sin6_scope_id)
3069                         return -EINVAL;
3070
3071         dev_addr->bound_dev_if = sin6->sin6_scope_id;
3072 #endif
3073         return 0;
3074 }
3075
3076 int rdma_listen(struct rdma_cm_id *id, int backlog)
3077 {
3078         struct rdma_id_private *id_priv;
3079         int ret;
3080
3081         id_priv = container_of(id, struct rdma_id_private, id);
3082         if (id_priv->state == RDMA_CM_IDLE) {
3083                 id->route.addr.src_addr.ss_family = AF_INET;
3084                 ret = rdma_bind_addr(id, cma_src_addr(id_priv));
3085                 if (ret)
3086                         return ret;
3087         }
3088
3089         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_LISTEN))
3090                 return -EINVAL;
3091
3092         if (id_priv->reuseaddr) {
3093                 ret = cma_bind_listen(id_priv);
3094                 if (ret)
3095                         goto err;
3096         }
3097
3098         id_priv->backlog = backlog;
3099         if (id->device) {
3100                 if (rdma_cap_ib_cm(id->device, 1)) {
3101                         ret = cma_ib_listen(id_priv);
3102                         if (ret)
3103                                 goto err;
3104                 } else if (rdma_cap_iw_cm(id->device, 1)) {
3105                         ret = cma_iw_listen(id_priv, backlog);
3106                         if (ret)
3107                                 goto err;
3108                 } else {
3109                         ret = -ENOSYS;
3110                         goto err;
3111                 }
3112         } else
3113                 cma_listen_on_all(id_priv);
3114
3115         return 0;
3116 err:
3117         id_priv->backlog = 0;
3118         cma_comp_exch(id_priv, RDMA_CM_LISTEN, RDMA_CM_ADDR_BOUND);
3119         return ret;
3120 }
3121 EXPORT_SYMBOL(rdma_listen);
3122
3123 int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr)
3124 {
3125         struct rdma_id_private *id_priv;
3126         int ret;
3127
3128         if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6 &&
3129             addr->sa_family != AF_IB)
3130                 return -EAFNOSUPPORT;
3131
3132         id_priv = container_of(id, struct rdma_id_private, id);
3133         if (!cma_comp_exch(id_priv, RDMA_CM_IDLE, RDMA_CM_ADDR_BOUND))
3134                 return -EINVAL;
3135
3136         ret = cma_check_linklocal(&id->route.addr.dev_addr, addr);
3137         if (ret)
3138                 goto err1;
3139
3140         memcpy(cma_src_addr(id_priv), addr, rdma_addr_size(addr));
3141         if (!cma_any_addr(addr)) {
3142                 ret = cma_translate_addr(addr, &id->route.addr.dev_addr);
3143                 if (ret)
3144                         goto err1;
3145
3146                 ret = cma_acquire_dev(id_priv, NULL);
3147                 if (ret)
3148                         goto err1;
3149         }
3150
3151         if (!(id_priv->options & (1 << CMA_OPTION_AFONLY))) {
3152                 if (addr->sa_family == AF_INET)
3153                         id_priv->afonly = 1;
3154 #if IS_ENABLED(CONFIG_IPV6)
3155                 else if (addr->sa_family == AF_INET6) {
3156                         struct net *net = id_priv->id.route.addr.dev_addr.net;
3157
3158                         id_priv->afonly = net->ipv6.sysctl.bindv6only;
3159                 }
3160 #endif
3161         }
3162         ret = cma_get_port(id_priv);
3163         if (ret)
3164                 goto err2;
3165
3166         return 0;
3167 err2:
3168         if (id_priv->cma_dev)
3169                 cma_release_dev(id_priv);
3170 err1:
3171         cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_IDLE);
3172         return ret;
3173 }
3174 EXPORT_SYMBOL(rdma_bind_addr);
3175
3176 static int cma_format_hdr(void *hdr, struct rdma_id_private *id_priv)
3177 {
3178         struct cma_hdr *cma_hdr;
3179
3180         cma_hdr = hdr;
3181         cma_hdr->cma_version = CMA_VERSION;
3182         if (cma_family(id_priv) == AF_INET) {
3183                 struct sockaddr_in *src4, *dst4;
3184
3185                 src4 = (struct sockaddr_in *) cma_src_addr(id_priv);
3186                 dst4 = (struct sockaddr_in *) cma_dst_addr(id_priv);
3187
3188                 cma_set_ip_ver(cma_hdr, 4);
3189                 cma_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
3190                 cma_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
3191                 cma_hdr->port = src4->sin_port;
3192         } else if (cma_family(id_priv) == AF_INET6) {
3193                 struct sockaddr_in6 *src6, *dst6;
3194
3195                 src6 = (struct sockaddr_in6 *) cma_src_addr(id_priv);
3196                 dst6 = (struct sockaddr_in6 *) cma_dst_addr(id_priv);
3197
3198                 cma_set_ip_ver(cma_hdr, 6);
3199                 cma_hdr->src_addr.ip6 = src6->sin6_addr;
3200                 cma_hdr->dst_addr.ip6 = dst6->sin6_addr;
3201                 cma_hdr->port = src6->sin6_port;
3202         }
3203         return 0;
3204 }
3205
3206 static int cma_sidr_rep_handler(struct ib_cm_id *cm_id,
3207                                 struct ib_cm_event *ib_event)
3208 {
3209         struct rdma_id_private *id_priv = cm_id->context;
3210         struct rdma_cm_event event;
3211         struct ib_cm_sidr_rep_event_param *rep = &ib_event->param.sidr_rep_rcvd;
3212         int ret = 0;
3213
3214         mutex_lock(&id_priv->handler_mutex);
3215         if (id_priv->state != RDMA_CM_CONNECT)
3216                 goto out;
3217
3218         memset(&event, 0, sizeof event);
3219         switch (ib_event->event) {
3220         case IB_CM_SIDR_REQ_ERROR:
3221                 event.event = RDMA_CM_EVENT_UNREACHABLE;
3222                 event.status = -ETIMEDOUT;
3223                 break;
3224         case IB_CM_SIDR_REP_RECEIVED:
3225                 event.param.ud.private_data = ib_event->private_data;
3226                 event.param.ud.private_data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
3227                 if (rep->status != IB_SIDR_SUCCESS) {
3228                         event.event = RDMA_CM_EVENT_UNREACHABLE;
3229                         event.status = ib_event->param.sidr_rep_rcvd.status;
3230                         break;
3231                 }
3232                 ret = cma_set_qkey(id_priv, rep->qkey);
3233                 if (ret) {
3234                         event.event = RDMA_CM_EVENT_ADDR_ERROR;
3235                         event.status = ret;
3236                         break;
3237                 }
3238                 ib_init_ah_from_path(id_priv->id.device, id_priv->id.port_num,
3239                                      id_priv->id.route.path_rec,
3240                                      &event.param.ud.ah_attr);
3241                 event.param.ud.qp_num = rep->qpn;
3242                 event.param.ud.qkey = rep->qkey;
3243                 event.event = RDMA_CM_EVENT_ESTABLISHED;
3244                 event.status = 0;
3245                 break;
3246         default:
3247                 pr_err("RDMA CMA: unexpected IB CM event: %d\n",
3248                        ib_event->event);
3249                 goto out;
3250         }
3251
3252         ret = id_priv->id.event_handler(&id_priv->id, &event);
3253         if (ret) {
3254                 /* Destroy the CM ID by returning a non-zero value. */
3255                 id_priv->cm_id.ib = NULL;
3256                 cma_exch(id_priv, RDMA_CM_DESTROYING);
3257                 mutex_unlock(&id_priv->handler_mutex);
3258                 rdma_destroy_id(&id_priv->id);
3259                 return ret;
3260         }
3261 out:
3262         mutex_unlock(&id_priv->handler_mutex);
3263         return ret;
3264 }
3265
3266 static int cma_resolve_ib_udp(struct rdma_id_private *id_priv,
3267                               struct rdma_conn_param *conn_param)
3268 {
3269         struct ib_cm_sidr_req_param req;
3270         struct ib_cm_id *id;
3271         void *private_data;
3272         int offset, ret;
3273
3274         memset(&req, 0, sizeof req);
3275         offset = cma_user_data_offset(id_priv);
3276         req.private_data_len = offset + conn_param->private_data_len;
3277         if (req.private_data_len < conn_param->private_data_len)
3278                 return -EINVAL;
3279
3280         if (req.private_data_len) {
3281                 private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
3282                 if (!private_data)
3283                         return -ENOMEM;
3284         } else {
3285                 private_data = NULL;
3286         }
3287
3288         if (conn_param->private_data && conn_param->private_data_len)
3289                 memcpy(private_data + offset, conn_param->private_data,
3290                        conn_param->private_data_len);
3291
3292         if (private_data) {
3293                 ret = cma_format_hdr(private_data, id_priv);
3294                 if (ret)
3295                         goto out;
3296                 req.private_data = private_data;
3297         }
3298
3299         id = ib_create_cm_id(id_priv->id.device, cma_sidr_rep_handler,
3300                              id_priv);
3301         if (IS_ERR(id)) {
3302                 ret = PTR_ERR(id);
3303                 goto out;
3304         }
3305         id_priv->cm_id.ib = id;
3306
3307         req.path = id_priv->id.route.path_rec;
3308         req.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
3309         req.timeout_ms = 1 << (CMA_CM_RESPONSE_TIMEOUT - 8);
3310         req.max_cm_retries = CMA_MAX_CM_RETRIES;
3311
3312         ret = ib_send_cm_sidr_req(id_priv->cm_id.ib, &req);
3313         if (ret) {
3314                 ib_destroy_cm_id(id_priv->cm_id.ib);
3315                 id_priv->cm_id.ib = NULL;
3316         }
3317 out:
3318         kfree(private_data);
3319         return ret;
3320 }
3321
3322 static int cma_connect_ib(struct rdma_id_private *id_priv,
3323                           struct rdma_conn_param *conn_param)
3324 {
3325         struct ib_cm_req_param req;
3326         struct rdma_route *route;
3327         void *private_data;
3328         struct ib_cm_id *id;
3329         int offset, ret;
3330
3331         memset(&req, 0, sizeof req);
3332         offset = cma_user_data_offset(id_priv);
3333         req.private_data_len = offset + conn_param->private_data_len;
3334         if (req.private_data_len < conn_param->private_data_len)
3335                 return -EINVAL;
3336
3337         if (req.private_data_len) {
3338                 private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
3339                 if (!private_data)
3340                         return -ENOMEM;
3341         } else {
3342                 private_data = NULL;
3343         }
3344
3345         if (conn_param->private_data && conn_param->private_data_len)
3346                 memcpy(private_data + offset, conn_param->private_data,
3347                        conn_param->private_data_len);
3348
3349         id = ib_create_cm_id(id_priv->id.device, cma_ib_handler, id_priv);
3350         if (IS_ERR(id)) {
3351                 ret = PTR_ERR(id);
3352                 goto out;
3353         }
3354         id_priv->cm_id.ib = id;
3355
3356         route = &id_priv->id.route;
3357         if (private_data) {
3358                 ret = cma_format_hdr(private_data, id_priv);
3359                 if (ret)
3360                         goto out;
3361                 req.private_data = private_data;
3362         }
3363
3364         req.primary_path = &route->path_rec[0];
3365         if (route->num_paths == 2)
3366                 req.alternate_path = &route->path_rec[1];
3367
3368         req.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
3369         req.qp_num = id_priv->qp_num;
3370         req.qp_type = id_priv->id.qp_type;
3371         req.starting_psn = id_priv->seq_num;
3372         req.responder_resources = conn_param->responder_resources;
3373         req.initiator_depth = conn_param->initiator_depth;
3374         req.flow_control = conn_param->flow_control;
3375         req.retry_count = min_t(u8, 7, conn_param->retry_count);
3376         req.rnr_retry_count = min_t(u8, 7, conn_param->rnr_retry_count);
3377         req.remote_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
3378         req.local_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
3379         req.max_cm_retries = CMA_MAX_CM_RETRIES;
3380         req.srq = id_priv->srq ? 1 : 0;
3381
3382         ret = ib_send_cm_req(id_priv->cm_id.ib, &req);
3383 out:
3384         if (ret && !IS_ERR(id)) {
3385                 ib_destroy_cm_id(id);
3386                 id_priv->cm_id.ib = NULL;
3387         }
3388
3389         kfree(private_data);
3390         return ret;
3391 }
3392
3393 static int cma_connect_iw(struct rdma_id_private *id_priv,
3394                           struct rdma_conn_param *conn_param)
3395 {
3396         struct iw_cm_id *cm_id;
3397         int ret;
3398         struct iw_cm_conn_param iw_param;
3399
3400         cm_id = iw_create_cm_id(id_priv->id.device, cma_iw_handler, id_priv);
3401         if (IS_ERR(cm_id))
3402                 return PTR_ERR(cm_id);
3403
3404         cm_id->tos = id_priv->tos;
3405         id_priv->cm_id.iw = cm_id;
3406
3407         memcpy(&cm_id->local_addr, cma_src_addr(id_priv),
3408                rdma_addr_size(cma_src_addr(id_priv)));
3409         memcpy(&cm_id->remote_addr, cma_dst_addr(id_priv),
3410                rdma_addr_size(cma_dst_addr(id_priv)));
3411
3412         ret = cma_modify_qp_rtr(id_priv, conn_param);
3413         if (ret)
3414                 goto out;
3415
3416         if (conn_param) {
3417                 iw_param.ord = conn_param->initiator_depth;
3418                 iw_param.ird = conn_param->responder_resources;
3419                 iw_param.private_data = conn_param->private_data;
3420                 iw_param.private_data_len = conn_param->private_data_len;
3421                 iw_param.qpn = id_priv->id.qp ? id_priv->qp_num : conn_param->qp_num;
3422         } else {
3423                 memset(&iw_param, 0, sizeof iw_param);
3424                 iw_param.qpn = id_priv->qp_num;
3425         }
3426         ret = iw_cm_connect(cm_id, &iw_param);
3427 out:
3428         if (ret) {
3429                 iw_destroy_cm_id(cm_id);
3430                 id_priv->cm_id.iw = NULL;
3431         }
3432         return ret;
3433 }
3434
3435 int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
3436 {
3437         struct rdma_id_private *id_priv;
3438         int ret;
3439
3440         id_priv = container_of(id, struct rdma_id_private, id);
3441         if (!cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_CONNECT))
3442                 return -EINVAL;
3443
3444         if (!id->qp) {
3445                 id_priv->qp_num = conn_param->qp_num;
3446                 id_priv->srq = conn_param->srq;
3447         }
3448
3449         if (rdma_cap_ib_cm(id->device, id->port_num)) {
3450                 if (id->qp_type == IB_QPT_UD)
3451                         ret = cma_resolve_ib_udp(id_priv, conn_param);
3452                 else
3453                         ret = cma_connect_ib(id_priv, conn_param);
3454         } else if (rdma_cap_iw_cm(id->device, id->port_num))
3455                 ret = cma_connect_iw(id_priv, conn_param);
3456         else
3457                 ret = -ENOSYS;
3458         if (ret)
3459                 goto err;
3460
3461         return 0;
3462 err:
3463         cma_comp_exch(id_priv, RDMA_CM_CONNECT, RDMA_CM_ROUTE_RESOLVED);
3464         return ret;
3465 }
3466 EXPORT_SYMBOL(rdma_connect);
3467
3468 static int cma_accept_ib(struct rdma_id_private *id_priv,
3469                          struct rdma_conn_param *conn_param)
3470 {
3471         struct ib_cm_rep_param rep;
3472         int ret;
3473
3474         ret = cma_modify_qp_rtr(id_priv, conn_param);
3475         if (ret)
3476                 goto out;
3477
3478         ret = cma_modify_qp_rts(id_priv, conn_param);
3479         if (ret)
3480                 goto out;
3481
3482         memset(&rep, 0, sizeof rep);
3483         rep.qp_num = id_priv->qp_num;
3484         rep.starting_psn = id_priv->seq_num;
3485         rep.private_data = conn_param->private_data;
3486         rep.private_data_len = conn_param->private_data_len;
3487         rep.responder_resources = conn_param->responder_resources;
3488         rep.initiator_depth = conn_param->initiator_depth;
3489         rep.failover_accepted = 0;
3490         rep.flow_control = conn_param->flow_control;
3491         rep.rnr_retry_count = min_t(u8, 7, conn_param->rnr_retry_count);
3492         rep.srq = id_priv->srq ? 1 : 0;
3493
3494         ret = ib_send_cm_rep(id_priv->cm_id.ib, &rep);
3495 out:
3496         return ret;
3497 }
3498
3499 static int cma_accept_iw(struct rdma_id_private *id_priv,
3500                   struct rdma_conn_param *conn_param)
3501 {
3502         struct iw_cm_conn_param iw_param;
3503         int ret;
3504
3505         ret = cma_modify_qp_rtr(id_priv, conn_param);
3506         if (ret)
3507                 return ret;
3508
3509         iw_param.ord = conn_param->initiator_depth;
3510         iw_param.ird = conn_param->responder_resources;
3511         iw_param.private_data = conn_param->private_data;
3512         iw_param.private_data_len = conn_param->private_data_len;
3513         if (id_priv->id.qp) {
3514                 iw_param.qpn = id_priv->qp_num;
3515         } else
3516                 iw_param.qpn = conn_param->qp_num;
3517
3518         return iw_cm_accept(id_priv->cm_id.iw, &iw_param);
3519 }
3520
3521 static int cma_send_sidr_rep(struct rdma_id_private *id_priv,
3522                              enum ib_cm_sidr_status status, u32 qkey,
3523                              const void *private_data, int private_data_len)
3524 {
3525         struct ib_cm_sidr_rep_param rep;
3526         int ret;
3527
3528         memset(&rep, 0, sizeof rep);
3529         rep.status = status;
3530         if (status == IB_SIDR_SUCCESS) {
3531                 ret = cma_set_qkey(id_priv, qkey);
3532                 if (ret)
3533                         return ret;
3534                 rep.qp_num = id_priv->qp_num;
3535                 rep.qkey = id_priv->qkey;
3536         }
3537         rep.private_data = private_data;
3538         rep.private_data_len = private_data_len;
3539
3540         return ib_send_cm_sidr_rep(id_priv->cm_id.ib, &rep);
3541 }
3542
3543 int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
3544 {
3545         struct rdma_id_private *id_priv;
3546         int ret;
3547
3548         id_priv = container_of(id, struct rdma_id_private, id);
3549
3550         id_priv->owner = task_pid_nr(current);
3551
3552         if (!cma_comp(id_priv, RDMA_CM_CONNECT))
3553                 return -EINVAL;
3554
3555         if (!id->qp && conn_param) {
3556                 id_priv->qp_num = conn_param->qp_num;
3557                 id_priv->srq = conn_param->srq;
3558         }
3559
3560         if (rdma_cap_ib_cm(id->device, id->port_num)) {
3561                 if (id->qp_type == IB_QPT_UD) {
3562                         if (conn_param)
3563                                 ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
3564                                                         conn_param->qkey,
3565                                                         conn_param->private_data,
3566                                                         conn_param->private_data_len);
3567                         else
3568                                 ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
3569                                                         0, NULL, 0);
3570                 } else {
3571                         if (conn_param)
3572                                 ret = cma_accept_ib(id_priv, conn_param);
3573                         else
3574                                 ret = cma_rep_recv(id_priv);
3575                 }
3576         } else if (rdma_cap_iw_cm(id->device, id->port_num))
3577                 ret = cma_accept_iw(id_priv, conn_param);
3578         else
3579                 ret = -ENOSYS;
3580
3581         if (ret)
3582                 goto reject;
3583
3584         return 0;
3585 reject:
3586         cma_modify_qp_err(id_priv);
3587         rdma_reject(id, NULL, 0);
3588         return ret;
3589 }
3590 EXPORT_SYMBOL(rdma_accept);
3591
3592 int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event)
3593 {
3594         struct rdma_id_private *id_priv;
3595         int ret;
3596
3597         id_priv = container_of(id, struct rdma_id_private, id);
3598         if (!id_priv->cm_id.ib)
3599                 return -EINVAL;
3600
3601         switch (id->device->node_type) {
3602         case RDMA_NODE_IB_CA:
3603                 ret = ib_cm_notify(id_priv->cm_id.ib, event);
3604                 break;
3605         default:
3606                 ret = 0;
3607                 break;
3608         }
3609         return ret;
3610 }
3611 EXPORT_SYMBOL(rdma_notify);
3612
3613 int rdma_reject(struct rdma_cm_id *id, const void *private_data,
3614                 u8 private_data_len)
3615 {
3616         struct rdma_id_private *id_priv;
3617         int ret;
3618
3619         id_priv = container_of(id, struct rdma_id_private, id);
3620         if (!id_priv->cm_id.ib)
3621                 return -EINVAL;
3622
3623         if (rdma_cap_ib_cm(id->device, id->port_num)) {
3624                 if (id->qp_type == IB_QPT_UD)
3625                         ret = cma_send_sidr_rep(id_priv, IB_SIDR_REJECT, 0,
3626                                                 private_data, private_data_len);
3627                 else
3628                         ret = ib_send_cm_rej(id_priv->cm_id.ib,
3629                                              IB_CM_REJ_CONSUMER_DEFINED, NULL,
3630                                              0, private_data, private_data_len);
3631         } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
3632                 ret = iw_cm_reject(id_priv->cm_id.iw,
3633                                    private_data, private_data_len);
3634         } else
3635                 ret = -ENOSYS;
3636
3637         return ret;
3638 }
3639 EXPORT_SYMBOL(rdma_reject);
3640
3641 int rdma_disconnect(struct rdma_cm_id *id)
3642 {
3643         struct rdma_id_private *id_priv;
3644         int ret;
3645
3646         id_priv = container_of(id, struct rdma_id_private, id);
3647         if (!id_priv->cm_id.ib)
3648                 return -EINVAL;
3649
3650         if (rdma_cap_ib_cm(id->device, id->port_num)) {
3651                 ret = cma_modify_qp_err(id_priv);
3652                 if (ret)
3653                         goto out;
3654                 /* Initiate or respond to a disconnect. */
3655                 if (ib_send_cm_dreq(id_priv->cm_id.ib, NULL, 0))
3656                         ib_send_cm_drep(id_priv->cm_id.ib, NULL, 0);
3657         } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
3658                 ret = iw_cm_disconnect(id_priv->cm_id.iw, 0);
3659         } else
3660                 ret = -EINVAL;
3661
3662 out:
3663         return ret;
3664 }
3665 EXPORT_SYMBOL(rdma_disconnect);
3666
3667 static int cma_ib_mc_handler(int status, struct ib_sa_multicast *multicast)
3668 {
3669         struct rdma_id_private *id_priv;
3670         struct cma_multicast *mc = multicast->context;
3671         struct rdma_cm_event event;
3672         int ret = 0;
3673
3674         id_priv = mc->id_priv;
3675         mutex_lock(&id_priv->handler_mutex);
3676         if (id_priv->state != RDMA_CM_ADDR_BOUND &&
3677             id_priv->state != RDMA_CM_ADDR_RESOLVED)
3678                 goto out;
3679
3680         if (!status)
3681                 status = cma_set_qkey(id_priv, be32_to_cpu(multicast->rec.qkey));
3682         mutex_lock(&id_priv->qp_mutex);
3683         if (!status && id_priv->id.qp)
3684                 status = ib_attach_mcast(id_priv->id.qp, &multicast->rec.mgid,
3685                                          be16_to_cpu(multicast->rec.mlid));
3686         mutex_unlock(&id_priv->qp_mutex);
3687
3688         memset(&event, 0, sizeof event);
3689         event.status = status;
3690         event.param.ud.private_data = mc->context;
3691         if (!status) {
3692                 struct rdma_dev_addr *dev_addr =
3693                         &id_priv->id.route.addr.dev_addr;
3694                 struct net_device *ndev =
3695                         dev_get_by_index(&init_net, dev_addr->bound_dev_if);
3696                 enum ib_gid_type gid_type =
3697                         id_priv->cma_dev->default_gid_type[id_priv->id.port_num -
3698                         rdma_start_port(id_priv->cma_dev->device)];
3699
3700                 event.event = RDMA_CM_EVENT_MULTICAST_JOIN;
3701                 ib_init_ah_from_mcmember(id_priv->id.device,
3702                                          id_priv->id.port_num, &multicast->rec,
3703                                          ndev, gid_type,
3704                                          &event.param.ud.ah_attr);
3705                 event.param.ud.qp_num = 0xFFFFFF;
3706                 event.param.ud.qkey = be32_to_cpu(multicast->rec.qkey);
3707                 if (ndev)
3708                         dev_put(ndev);
3709         } else
3710                 event.event = RDMA_CM_EVENT_MULTICAST_ERROR;
3711
3712         ret = id_priv->id.event_handler(&id_priv->id, &event);
3713         if (ret) {
3714                 cma_exch(id_priv, RDMA_CM_DESTROYING);
3715                 mutex_unlock(&id_priv->handler_mutex);
3716                 rdma_destroy_id(&id_priv->id);
3717                 return 0;
3718         }
3719
3720 out:
3721         mutex_unlock(&id_priv->handler_mutex);
3722         return 0;
3723 }
3724
3725 static void cma_set_mgid(struct rdma_id_private *id_priv,
3726                          struct sockaddr *addr, union ib_gid *mgid)
3727 {
3728         unsigned char mc_map[MAX_ADDR_LEN];
3729         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
3730         struct sockaddr_in *sin = (struct sockaddr_in *) addr;
3731         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) addr;
3732
3733         if (cma_any_addr(addr)) {
3734                 memset(mgid, 0, sizeof *mgid);
3735         } else if ((addr->sa_family == AF_INET6) &&
3736                    ((be32_to_cpu(sin6->sin6_addr.s6_addr32[0]) & 0xFFF0FFFF) ==
3737                                                                  0xFF10A01B)) {
3738                 /* IPv6 address is an SA assigned MGID. */
3739                 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
3740         } else if (addr->sa_family == AF_IB) {
3741                 memcpy(mgid, &((struct sockaddr_ib *) addr)->sib_addr, sizeof *mgid);
3742         } else if ((addr->sa_family == AF_INET6)) {
3743                 ipv6_ib_mc_map(&sin6->sin6_addr, dev_addr->broadcast, mc_map);
3744                 if (id_priv->id.ps == RDMA_PS_UDP)
3745                         mc_map[7] = 0x01;       /* Use RDMA CM signature */
3746                 *mgid = *(union ib_gid *) (mc_map + 4);
3747         } else {
3748                 ip_ib_mc_map(sin->sin_addr.s_addr, dev_addr->broadcast, mc_map);
3749                 if (id_priv->id.ps == RDMA_PS_UDP)
3750                         mc_map[7] = 0x01;       /* Use RDMA CM signature */
3751                 *mgid = *(union ib_gid *) (mc_map + 4);
3752         }
3753 }
3754
3755 static int cma_join_ib_multicast(struct rdma_id_private *id_priv,
3756                                  struct cma_multicast *mc)
3757 {
3758         struct ib_sa_mcmember_rec rec;
3759         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
3760         ib_sa_comp_mask comp_mask;
3761         int ret;
3762
3763         ib_addr_get_mgid(dev_addr, &rec.mgid);
3764         ret = ib_sa_get_mcmember_rec(id_priv->id.device, id_priv->id.port_num,
3765                                      &rec.mgid, &rec);
3766         if (ret)
3767                 return ret;
3768
3769         ret = cma_set_qkey(id_priv, 0);
3770         if (ret)
3771                 return ret;
3772
3773         cma_set_mgid(id_priv, (struct sockaddr *) &mc->addr, &rec.mgid);
3774         rec.qkey = cpu_to_be32(id_priv->qkey);
3775         rdma_addr_get_sgid(dev_addr, &rec.port_gid);
3776         rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
3777         rec.join_state = 1;
3778
3779         comp_mask = IB_SA_MCMEMBER_REC_MGID | IB_SA_MCMEMBER_REC_PORT_GID |
3780                     IB_SA_MCMEMBER_REC_PKEY | IB_SA_MCMEMBER_REC_JOIN_STATE |
3781                     IB_SA_MCMEMBER_REC_QKEY | IB_SA_MCMEMBER_REC_SL |
3782                     IB_SA_MCMEMBER_REC_FLOW_LABEL |
3783                     IB_SA_MCMEMBER_REC_TRAFFIC_CLASS;
3784
3785         if (id_priv->id.ps == RDMA_PS_IPOIB)
3786                 comp_mask |= IB_SA_MCMEMBER_REC_RATE |
3787                              IB_SA_MCMEMBER_REC_RATE_SELECTOR |
3788                              IB_SA_MCMEMBER_REC_MTU_SELECTOR |
3789                              IB_SA_MCMEMBER_REC_MTU |
3790                              IB_SA_MCMEMBER_REC_HOP_LIMIT;
3791
3792         mc->multicast.ib = ib_sa_join_multicast(&sa_client, id_priv->id.device,
3793                                                 id_priv->id.port_num, &rec,
3794                                                 comp_mask, GFP_KERNEL,
3795                                                 cma_ib_mc_handler, mc);
3796         return PTR_ERR_OR_ZERO(mc->multicast.ib);
3797 }
3798
3799 static void iboe_mcast_work_handler(struct work_struct *work)
3800 {
3801         struct iboe_mcast_work *mw = container_of(work, struct iboe_mcast_work, work);
3802         struct cma_multicast *mc = mw->mc;
3803         struct ib_sa_multicast *m = mc->multicast.ib;
3804
3805         mc->multicast.ib->context = mc;
3806         cma_ib_mc_handler(0, m);
3807         kref_put(&mc->mcref, release_mc);
3808         kfree(mw);
3809 }
3810
3811 static void cma_iboe_set_mgid(struct sockaddr *addr, union ib_gid *mgid)
3812 {
3813         struct sockaddr_in *sin = (struct sockaddr_in *)addr;
3814         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr;
3815
3816         if (cma_any_addr(addr)) {
3817                 memset(mgid, 0, sizeof *mgid);
3818         } else if (addr->sa_family == AF_INET6) {
3819                 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
3820         } else {
3821                 mgid->raw[0] = 0xff;
3822                 mgid->raw[1] = 0x0e;
3823                 mgid->raw[2] = 0;
3824                 mgid->raw[3] = 0;
3825                 mgid->raw[4] = 0;
3826                 mgid->raw[5] = 0;
3827                 mgid->raw[6] = 0;
3828                 mgid->raw[7] = 0;
3829                 mgid->raw[8] = 0;
3830                 mgid->raw[9] = 0;
3831                 mgid->raw[10] = 0xff;
3832                 mgid->raw[11] = 0xff;
3833                 *(__be32 *)(&mgid->raw[12]) = sin->sin_addr.s_addr;
3834         }
3835 }
3836
3837 static int cma_iboe_join_multicast(struct rdma_id_private *id_priv,
3838                                    struct cma_multicast *mc)
3839 {
3840         struct iboe_mcast_work *work;
3841         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
3842         int err = 0;
3843         struct sockaddr *addr = (struct sockaddr *)&mc->addr;
3844         struct net_device *ndev = NULL;
3845         enum ib_gid_type gid_type;
3846
3847         if (cma_zero_addr((struct sockaddr *)&mc->addr))
3848                 return -EINVAL;
3849
3850         work = kzalloc(sizeof *work, GFP_KERNEL);
3851         if (!work)
3852                 return -ENOMEM;
3853
3854         mc->multicast.ib = kzalloc(sizeof(struct ib_sa_multicast), GFP_KERNEL);
3855         if (!mc->multicast.ib) {
3856                 err = -ENOMEM;
3857                 goto out1;
3858         }
3859
3860         cma_iboe_set_mgid(addr, &mc->multicast.ib->rec.mgid);
3861
3862         mc->multicast.ib->rec.pkey = cpu_to_be16(0xffff);
3863         if (id_priv->id.ps == RDMA_PS_UDP)
3864                 mc->multicast.ib->rec.qkey = cpu_to_be32(RDMA_UDP_QKEY);
3865
3866         if (dev_addr->bound_dev_if)
3867                 ndev = dev_get_by_index(&init_net, dev_addr->bound_dev_if);
3868         if (!ndev) {
3869                 err = -ENODEV;
3870                 goto out2;
3871         }
3872         mc->multicast.ib->rec.rate = iboe_get_rate(ndev);
3873         mc->multicast.ib->rec.hop_limit = 1;
3874         mc->multicast.ib->rec.mtu = iboe_get_mtu(ndev->mtu);
3875
3876         gid_type = id_priv->cma_dev->default_gid_type[id_priv->id.port_num -
3877                    rdma_start_port(id_priv->cma_dev->device)];
3878         if (addr->sa_family == AF_INET) {
3879                 if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) {
3880                         mc->multicast.ib->rec.hop_limit = IPV6_DEFAULT_HOPLIMIT;
3881                         err = cma_igmp_send(ndev, &mc->multicast.ib->rec.mgid,
3882                                             true);
3883                         if (!err)
3884                                 mc->igmp_joined = true;
3885                 }
3886         } else {
3887                 if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP)
3888                         err = -ENOTSUPP;
3889         }
3890         dev_put(ndev);
3891         if (err || !mc->multicast.ib->rec.mtu) {
3892                 if (!err)
3893                         err = -EINVAL;
3894                 goto out2;
3895         }
3896         rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
3897                     &mc->multicast.ib->rec.port_gid);
3898         work->id = id_priv;
3899         work->mc = mc;
3900         INIT_WORK(&work->work, iboe_mcast_work_handler);
3901         kref_get(&mc->mcref);
3902         queue_work(cma_wq, &work->work);
3903
3904         return 0;
3905
3906 out2:
3907         kfree(mc->multicast.ib);
3908 out1:
3909         kfree(work);
3910         return err;
3911 }
3912
3913 int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
3914                         void *context)
3915 {
3916         struct rdma_id_private *id_priv;
3917         struct cma_multicast *mc;
3918         int ret;
3919
3920         id_priv = container_of(id, struct rdma_id_private, id);
3921         if (!cma_comp(id_priv, RDMA_CM_ADDR_BOUND) &&
3922             !cma_comp(id_priv, RDMA_CM_ADDR_RESOLVED))
3923                 return -EINVAL;
3924
3925         mc = kmalloc(sizeof *mc, GFP_KERNEL);
3926         if (!mc)
3927                 return -ENOMEM;
3928
3929         memcpy(&mc->addr, addr, rdma_addr_size(addr));
3930         mc->context = context;
3931         mc->id_priv = id_priv;
3932         mc->igmp_joined = false;
3933         spin_lock(&id_priv->lock);
3934         list_add(&mc->list, &id_priv->mc_list);
3935         spin_unlock(&id_priv->lock);
3936
3937         if (rdma_protocol_roce(id->device, id->port_num)) {
3938                 kref_init(&mc->mcref);
3939                 ret = cma_iboe_join_multicast(id_priv, mc);
3940         } else if (rdma_cap_ib_mcast(id->device, id->port_num))
3941                 ret = cma_join_ib_multicast(id_priv, mc);
3942         else
3943                 ret = -ENOSYS;
3944
3945         if (ret) {
3946                 spin_lock_irq(&id_priv->lock);
3947                 list_del(&mc->list);
3948                 spin_unlock_irq(&id_priv->lock);
3949                 kfree(mc);
3950         }
3951         return ret;
3952 }
3953 EXPORT_SYMBOL(rdma_join_multicast);
3954
3955 void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr)
3956 {
3957         struct rdma_id_private *id_priv;
3958         struct cma_multicast *mc;
3959
3960         id_priv = container_of(id, struct rdma_id_private, id);
3961         spin_lock_irq(&id_priv->lock);
3962         list_for_each_entry(mc, &id_priv->mc_list, list) {
3963                 if (!memcmp(&mc->addr, addr, rdma_addr_size(addr))) {
3964                         list_del(&mc->list);
3965                         spin_unlock_irq(&id_priv->lock);
3966
3967                         if (id->qp)
3968                                 ib_detach_mcast(id->qp,
3969                                                 &mc->multicast.ib->rec.mgid,
3970                                                 be16_to_cpu(mc->multicast.ib->rec.mlid));
3971
3972                         BUG_ON(id_priv->cma_dev->device != id->device);
3973
3974                         if (rdma_cap_ib_mcast(id->device, id->port_num)) {
3975                                 ib_sa_free_multicast(mc->multicast.ib);
3976                                 kfree(mc);
3977                         } else if (rdma_protocol_roce(id->device, id->port_num)) {
3978                                 if (mc->igmp_joined) {
3979                                         struct rdma_dev_addr *dev_addr =
3980                                                 &id->route.addr.dev_addr;
3981                                         struct net_device *ndev = NULL;
3982
3983                                         if (dev_addr->bound_dev_if)
3984                                                 ndev = dev_get_by_index(&init_net,
3985                                                                         dev_addr->bound_dev_if);
3986                                         if (ndev) {
3987                                                 cma_igmp_send(ndev,
3988                                                               &mc->multicast.ib->rec.mgid,
3989                                                               false);
3990                                                 dev_put(ndev);
3991                                         }
3992                                         mc->igmp_joined = false;
3993                                 }
3994                                 kref_put(&mc->mcref, release_mc);
3995                         }
3996                         return;
3997                 }
3998         }
3999         spin_unlock_irq(&id_priv->lock);
4000 }
4001 EXPORT_SYMBOL(rdma_leave_multicast);
4002
4003 static int cma_netdev_change(struct net_device *ndev, struct rdma_id_private *id_priv)
4004 {
4005         struct rdma_dev_addr *dev_addr;
4006         struct cma_ndev_work *work;
4007
4008         dev_addr = &id_priv->id.route.addr.dev_addr;
4009
4010         if ((dev_addr->bound_dev_if == ndev->ifindex) &&
4011             (net_eq(dev_net(ndev), dev_addr->net)) &&
4012             memcmp(dev_addr->src_dev_addr, ndev->dev_addr, ndev->addr_len)) {
4013                 pr_info("RDMA CM addr change for ndev %s used by id %p\n",
4014                         ndev->name, &id_priv->id);
4015                 work = kzalloc(sizeof *work, GFP_KERNEL);
4016                 if (!work)
4017                         return -ENOMEM;
4018
4019                 INIT_WORK(&work->work, cma_ndev_work_handler);
4020                 work->id = id_priv;
4021                 work->event.event = RDMA_CM_EVENT_ADDR_CHANGE;
4022                 atomic_inc(&id_priv->refcount);
4023                 queue_work(cma_wq, &work->work);
4024         }
4025
4026         return 0;
4027 }
4028
4029 static int cma_netdev_callback(struct notifier_block *self, unsigned long event,
4030                                void *ptr)
4031 {
4032         struct net_device *ndev = netdev_notifier_info_to_dev(ptr);
4033         struct cma_device *cma_dev;
4034         struct rdma_id_private *id_priv;
4035         int ret = NOTIFY_DONE;
4036
4037         if (event != NETDEV_BONDING_FAILOVER)
4038                 return NOTIFY_DONE;
4039
4040         if (!(ndev->flags & IFF_MASTER) || !(ndev->priv_flags & IFF_BONDING))
4041                 return NOTIFY_DONE;
4042
4043         mutex_lock(&lock);
4044         list_for_each_entry(cma_dev, &dev_list, list)
4045                 list_for_each_entry(id_priv, &cma_dev->id_list, list) {
4046                         ret = cma_netdev_change(ndev, id_priv);
4047                         if (ret)
4048                                 goto out;
4049                 }
4050
4051 out:
4052         mutex_unlock(&lock);
4053         return ret;
4054 }
4055
4056 static struct notifier_block cma_nb = {
4057         .notifier_call = cma_netdev_callback
4058 };
4059
4060 static void cma_add_one(struct ib_device *device)
4061 {
4062         struct cma_device *cma_dev;
4063         struct rdma_id_private *id_priv;
4064         unsigned int i;
4065         unsigned long supported_gids = 0;
4066
4067         cma_dev = kmalloc(sizeof *cma_dev, GFP_KERNEL);
4068         if (!cma_dev)
4069                 return;
4070
4071         cma_dev->device = device;
4072         cma_dev->default_gid_type = kcalloc(device->phys_port_cnt,
4073                                             sizeof(*cma_dev->default_gid_type),
4074                                             GFP_KERNEL);
4075         if (!cma_dev->default_gid_type) {
4076                 kfree(cma_dev);
4077                 return;
4078         }
4079         for (i = rdma_start_port(device); i <= rdma_end_port(device); i++) {
4080                 supported_gids = roce_gid_type_mask_support(device, i);
4081                 WARN_ON(!supported_gids);
4082                 cma_dev->default_gid_type[i - rdma_start_port(device)] =
4083                         find_first_bit(&supported_gids, BITS_PER_LONG);
4084         }
4085
4086         init_completion(&cma_dev->comp);
4087         atomic_set(&cma_dev->refcount, 1);
4088         INIT_LIST_HEAD(&cma_dev->id_list);
4089         ib_set_client_data(device, &cma_client, cma_dev);
4090
4091         mutex_lock(&lock);
4092         list_add_tail(&cma_dev->list, &dev_list);
4093         list_for_each_entry(id_priv, &listen_any_list, list)
4094                 cma_listen_on_dev(id_priv, cma_dev);
4095         mutex_unlock(&lock);
4096 }
4097
4098 static int cma_remove_id_dev(struct rdma_id_private *id_priv)
4099 {
4100         struct rdma_cm_event event;
4101         enum rdma_cm_state state;
4102         int ret = 0;
4103
4104         /* Record that we want to remove the device */
4105         state = cma_exch(id_priv, RDMA_CM_DEVICE_REMOVAL);
4106         if (state == RDMA_CM_DESTROYING)
4107                 return 0;
4108
4109         cma_cancel_operation(id_priv, state);
4110         mutex_lock(&id_priv->handler_mutex);
4111
4112         /* Check for destruction from another callback. */
4113         if (!cma_comp(id_priv, RDMA_CM_DEVICE_REMOVAL))
4114                 goto out;
4115
4116         memset(&event, 0, sizeof event);
4117         event.event = RDMA_CM_EVENT_DEVICE_REMOVAL;
4118         ret = id_priv->id.event_handler(&id_priv->id, &event);
4119 out:
4120         mutex_unlock(&id_priv->handler_mutex);
4121         return ret;
4122 }
4123
4124 static void cma_process_remove(struct cma_device *cma_dev)
4125 {
4126         struct rdma_id_private *id_priv;
4127         int ret;
4128
4129         mutex_lock(&lock);
4130         while (!list_empty(&cma_dev->id_list)) {
4131                 id_priv = list_entry(cma_dev->id_list.next,
4132                                      struct rdma_id_private, list);
4133
4134                 list_del(&id_priv->listen_list);
4135                 list_del_init(&id_priv->list);
4136                 atomic_inc(&id_priv->refcount);
4137                 mutex_unlock(&lock);
4138
4139                 ret = id_priv->internal_id ? 1 : cma_remove_id_dev(id_priv);
4140                 cma_deref_id(id_priv);
4141                 if (ret)
4142                         rdma_destroy_id(&id_priv->id);
4143
4144                 mutex_lock(&lock);
4145         }
4146         mutex_unlock(&lock);
4147
4148         cma_deref_dev(cma_dev);
4149         wait_for_completion(&cma_dev->comp);
4150 }
4151
4152 static void cma_remove_one(struct ib_device *device, void *client_data)
4153 {
4154         struct cma_device *cma_dev = client_data;
4155
4156         if (!cma_dev)
4157                 return;
4158
4159         mutex_lock(&lock);
4160         list_del(&cma_dev->list);
4161         mutex_unlock(&lock);
4162
4163         cma_process_remove(cma_dev);
4164         kfree(cma_dev->default_gid_type);
4165         kfree(cma_dev);
4166 }
4167
4168 static int cma_get_id_stats(struct sk_buff *skb, struct netlink_callback *cb)
4169 {
4170         struct nlmsghdr *nlh;
4171         struct rdma_cm_id_stats *id_stats;
4172         struct rdma_id_private *id_priv;
4173         struct rdma_cm_id *id = NULL;
4174         struct cma_device *cma_dev;
4175         int i_dev = 0, i_id = 0;
4176
4177         /*
4178          * We export all of the IDs as a sequence of messages.  Each
4179          * ID gets its own netlink message.
4180          */
4181         mutex_lock(&lock);
4182
4183         list_for_each_entry(cma_dev, &dev_list, list) {
4184                 if (i_dev < cb->args[0]) {
4185                         i_dev++;
4186                         continue;
4187                 }
4188
4189                 i_id = 0;
4190                 list_for_each_entry(id_priv, &cma_dev->id_list, list) {
4191                         if (i_id < cb->args[1]) {
4192                                 i_id++;
4193                                 continue;
4194                         }
4195
4196                         id_stats = ibnl_put_msg(skb, &nlh, cb->nlh->nlmsg_seq,
4197                                                 sizeof *id_stats, RDMA_NL_RDMA_CM,
4198                                                 RDMA_NL_RDMA_CM_ID_STATS,
4199                                                 NLM_F_MULTI);
4200                         if (!id_stats)
4201                                 goto out;
4202
4203                         memset(id_stats, 0, sizeof *id_stats);
4204                         id = &id_priv->id;
4205                         id_stats->node_type = id->route.addr.dev_addr.dev_type;
4206                         id_stats->port_num = id->port_num;
4207                         id_stats->bound_dev_if =
4208                                 id->route.addr.dev_addr.bound_dev_if;
4209
4210                         if (ibnl_put_attr(skb, nlh,
4211                                           rdma_addr_size(cma_src_addr(id_priv)),
4212                                           cma_src_addr(id_priv),
4213                                           RDMA_NL_RDMA_CM_ATTR_SRC_ADDR))
4214                                 goto out;
4215                         if (ibnl_put_attr(skb, nlh,
4216                                           rdma_addr_size(cma_src_addr(id_priv)),
4217                                           cma_dst_addr(id_priv),
4218                                           RDMA_NL_RDMA_CM_ATTR_DST_ADDR))
4219                                 goto out;
4220
4221                         id_stats->pid           = id_priv->owner;
4222                         id_stats->port_space    = id->ps;
4223                         id_stats->cm_state      = id_priv->state;
4224                         id_stats->qp_num        = id_priv->qp_num;
4225                         id_stats->qp_type       = id->qp_type;
4226
4227                         i_id++;
4228                 }
4229
4230                 cb->args[1] = 0;
4231                 i_dev++;
4232         }
4233
4234 out:
4235         mutex_unlock(&lock);
4236         cb->args[0] = i_dev;
4237         cb->args[1] = i_id;
4238
4239         return skb->len;
4240 }
4241
4242 static const struct ibnl_client_cbs cma_cb_table[] = {
4243         [RDMA_NL_RDMA_CM_ID_STATS] = { .dump = cma_get_id_stats,
4244                                        .module = THIS_MODULE },
4245 };
4246
4247 static int cma_init_net(struct net *net)
4248 {
4249         struct cma_pernet *pernet = cma_pernet(net);
4250
4251         idr_init(&pernet->tcp_ps);
4252         idr_init(&pernet->udp_ps);
4253         idr_init(&pernet->ipoib_ps);
4254         idr_init(&pernet->ib_ps);
4255
4256         return 0;
4257 }
4258
4259 static void cma_exit_net(struct net *net)
4260 {
4261         struct cma_pernet *pernet = cma_pernet(net);
4262
4263         idr_destroy(&pernet->tcp_ps);
4264         idr_destroy(&pernet->udp_ps);
4265         idr_destroy(&pernet->ipoib_ps);
4266         idr_destroy(&pernet->ib_ps);
4267 }
4268
4269 static struct pernet_operations cma_pernet_operations = {
4270         .init = cma_init_net,
4271         .exit = cma_exit_net,
4272         .id = &cma_pernet_id,
4273         .size = sizeof(struct cma_pernet),
4274 };
4275
4276 static int __init cma_init(void)
4277 {
4278         int ret;
4279
4280         cma_wq = create_singlethread_workqueue("rdma_cm");
4281         if (!cma_wq)
4282                 return -ENOMEM;
4283
4284         ret = register_pernet_subsys(&cma_pernet_operations);
4285         if (ret)
4286                 goto err_wq;
4287
4288         ib_sa_register_client(&sa_client);
4289         rdma_addr_register_client(&addr_client);
4290         register_netdevice_notifier(&cma_nb);
4291
4292         ret = ib_register_client(&cma_client);
4293         if (ret)
4294                 goto err;
4295
4296         if (ibnl_add_client(RDMA_NL_RDMA_CM, ARRAY_SIZE(cma_cb_table),
4297                             cma_cb_table))
4298                 pr_warn("RDMA CMA: failed to add netlink callback\n");
4299         cma_configfs_init();
4300
4301         return 0;
4302
4303 err:
4304         unregister_netdevice_notifier(&cma_nb);
4305         rdma_addr_unregister_client(&addr_client);
4306         ib_sa_unregister_client(&sa_client);
4307 err_wq:
4308         destroy_workqueue(cma_wq);
4309         return ret;
4310 }
4311
4312 static void __exit cma_cleanup(void)
4313 {
4314         cma_configfs_exit();
4315         ibnl_remove_client(RDMA_NL_RDMA_CM);
4316         ib_unregister_client(&cma_client);
4317         unregister_netdevice_notifier(&cma_nb);
4318         rdma_addr_unregister_client(&addr_client);
4319         ib_sa_unregister_client(&sa_client);
4320         unregister_pernet_subsys(&cma_pernet_operations);
4321         destroy_workqueue(cma_wq);
4322 }
4323
4324 module_init(cma_init);
4325 module_exit(cma_cleanup);