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_QUERY_CLASSPORT_INFO_TIMEOUT 3000
  72 #define CMA_MAX_CM_RETRIES 15
  73 #define CMA_CM_MRA_SETTING (IB_CM_MRA_FLAG_DELAY | 24)
  74 #define CMA_IBOE_PACKET_LIFETIME 18
  75 #define CMA_PREFERRED_ROCE_GID_TYPE IB_GID_TYPE_ROCE_UDP_ENCAP
  76
  77 static const char * const cma_events[] = {
  78         [RDMA_CM_EVENT_ADDR_RESOLVED]    = "address resolved",
  79         [RDMA_CM_EVENT_ADDR_ERROR]       = "address error",
  80         [RDMA_CM_EVENT_ROUTE_RESOLVED]   = "route resolved ",
  81         [RDMA_CM_EVENT_ROUTE_ERROR]      = "route error",
  82         [RDMA_CM_EVENT_CONNECT_REQUEST]  = "connect request",
  83         [RDMA_CM_EVENT_CONNECT_RESPONSE] = "connect response",
  84         [RDMA_CM_EVENT_CONNECT_ERROR]    = "connect error",
  85         [RDMA_CM_EVENT_UNREACHABLE]      = "unreachable",
  86         [RDMA_CM_EVENT_REJECTED]         = "rejected",
  87         [RDMA_CM_EVENT_ESTABLISHED]      = "established",
  88         [RDMA_CM_EVENT_DISCONNECTED]     = "disconnected",
  89         [RDMA_CM_EVENT_DEVICE_REMOVAL]   = "device removal",
  90         [RDMA_CM_EVENT_MULTICAST_JOIN]   = "multicast join",
  91         [RDMA_CM_EVENT_MULTICAST_ERROR]  = "multicast error",
  92         [RDMA_CM_EVENT_ADDR_CHANGE]      = "address change",
  93         [RDMA_CM_EVENT_TIMEWAIT_EXIT]    = "timewait exit",
  94 };
  95
  96 const char *__attribute_const__ rdma_event_msg(enum rdma_cm_event_type event)
  97 {
  98         size_t index = event;
  99
 100         return (index < ARRAY_SIZE(cma_events) && cma_events[index]) ?
 101                         cma_events[index] : "unrecognized event";
 102 }
 103 EXPORT_SYMBOL(rdma_event_msg);
 104
 105 const char *__attribute_const__ rdma_reject_msg(struct rdma_cm_id *id,
 106                                                 int reason)
 107 {
 108         if (rdma_ib_or_roce(id->device, id->port_num))
 109                 return ibcm_reject_msg(reason);
 110
 111         if (rdma_protocol_iwarp(id->device, id->port_num))
 112                 return iwcm_reject_msg(reason);
 113
 114         WARN_ON_ONCE(1);
 115         return "unrecognized transport";
 116 }
 117 EXPORT_SYMBOL(rdma_reject_msg);
 118
 119 bool rdma_is_consumer_reject(struct rdma_cm_id *id, int reason)
 120 {
 121         if (rdma_ib_or_roce(id->device, id->port_num))
 122                 return reason == IB_CM_REJ_CONSUMER_DEFINED;
 123
 124         if (rdma_protocol_iwarp(id->device, id->port_num))
 125                 return reason == -ECONNREFUSED;
 126
 127         WARN_ON_ONCE(1);
 128         return false;
 129 }
 130 EXPORT_SYMBOL(rdma_is_consumer_reject);
 131
 132 const void *rdma_consumer_reject_data(struct rdma_cm_id *id,
 133                                       struct rdma_cm_event *ev, u8 *data_len)
 134 {
 135         const void *p;
 136
 137         if (rdma_is_consumer_reject(id, ev->status)) {
 138                 *data_len = ev->param.conn.private_data_len;
 139                 p = ev->param.conn.private_data;
 140         } else {
 141                 *data_len = 0;
 142                 p = NULL;
 143         }
 144         return p;
 145 }
 146 EXPORT_SYMBOL(rdma_consumer_reject_data);
 147
 148 static void cma_add_one(struct ib_device *device);
 149 static void cma_remove_one(struct ib_device *device, void *client_data);
 150
 151 static struct ib_client cma_client = {
 152         .name   = "cma",
 153         .add    = cma_add_one,
 154         .remove = cma_remove_one
 155 };
 156
 157 static struct ib_sa_client sa_client;
 158 static struct rdma_addr_client addr_client;
 159 static LIST_HEAD(dev_list);
 160 static LIST_HEAD(listen_any_list);
 161 static DEFINE_MUTEX(lock);
 162 static struct workqueue_struct *cma_wq;
 163 static unsigned int cma_pernet_id;
 164
 165 struct cma_pernet {
 166         struct idr tcp_ps;
 167         struct idr udp_ps;
 168         struct idr ipoib_ps;
 169         struct idr ib_ps;
 170 };
 171
 172 static struct cma_pernet *cma_pernet(struct net *net)
 173 {
 174         return net_generic(net, cma_pernet_id);
 175 }
 176
 177 static struct idr *cma_pernet_idr(struct net *net, enum rdma_port_space ps)
 178 {
 179         struct cma_pernet *pernet = cma_pernet(net);
 180
 181         switch (ps) {
 182         case RDMA_PS_TCP:
 183                 return &pernet->tcp_ps;
 184         case RDMA_PS_UDP:
 185                 return &pernet->udp_ps;
 186         case RDMA_PS_IPOIB:
 187                 return &pernet->ipoib_ps;
 188         case RDMA_PS_IB:
 189                 return &pernet->ib_ps;
 190         default:
 191                 return NULL;
 192         }
 193 }
 194
 195 struct cma_device {
 196         struct list_head        list;
 197         struct ib_device        *device;
 198         struct completion       comp;
 199         atomic_t                refcount;
 200         struct list_head        id_list;
 201         enum ib_gid_type        *default_gid_type;
 202         u8                      *default_roce_tos;
 203 };
 204
 205 struct rdma_bind_list {
 206         enum rdma_port_space    ps;
 207         struct hlist_head       owners;
 208         unsigned short          port;
 209 };
 210
 211 struct class_port_info_context {
 212         struct ib_class_port_info       *class_port_info;
 213         struct ib_device                *device;
 214         struct completion               done;
 215         struct ib_sa_query              *sa_query;
 216         u8                              port_num;
 217 };
 218
 219 static int cma_ps_alloc(struct net *net, enum rdma_port_space ps,
 220                         struct rdma_bind_list *bind_list, int snum)
 221 {
 222         struct idr *idr = cma_pernet_idr(net, ps);
 223
 224         return idr_alloc(idr, bind_list, snum, snum + 1, GFP_KERNEL);
 225 }
 226
 227 static struct rdma_bind_list *cma_ps_find(struct net *net,
 228                                           enum rdma_port_space ps, int snum)
 229 {
 230         struct idr *idr = cma_pernet_idr(net, ps);
 231
 232         return idr_find(idr, snum);
 233 }
 234
 235 static void cma_ps_remove(struct net *net, enum rdma_port_space ps, int snum)
 236 {
 237         struct idr *idr = cma_pernet_idr(net, ps);
 238
 239         idr_remove(idr, snum);
 240 }
 241
 242 enum {
 243         CMA_OPTION_AFONLY,
 244 };
 245
 246 void cma_ref_dev(struct cma_device *cma_dev)
 247 {
 248         atomic_inc(&cma_dev->refcount);
 249 }
 250
 251 struct cma_device *cma_enum_devices_by_ibdev(cma_device_filter  filter,
 252                                              void               *cookie)
 253 {
 254         struct cma_device *cma_dev;
 255         struct cma_device *found_cma_dev = NULL;
 256
 257         mutex_lock(&lock);
 258
 259         list_for_each_entry(cma_dev, &dev_list, list)
 260                 if (filter(cma_dev->device, cookie)) {
 261                         found_cma_dev = cma_dev;
 262                         break;
 263                 }
 264
 265         if (found_cma_dev)
 266                 cma_ref_dev(found_cma_dev);
 267         mutex_unlock(&lock);
 268         return found_cma_dev;
 269 }
 270
 271 int cma_get_default_gid_type(struct cma_device *cma_dev,
 272                              unsigned int port)
 273 {
 274         if (!rdma_is_port_valid(cma_dev->device, port))
 275                 return -EINVAL;
 276
 277         return cma_dev->default_gid_type[port - rdma_start_port(cma_dev->device)];
 278 }
 279
 280 int cma_set_default_gid_type(struct cma_device *cma_dev,
 281                              unsigned int port,
 282                              enum ib_gid_type default_gid_type)
 283 {
 284         unsigned long supported_gids;
 285
 286         if (!rdma_is_port_valid(cma_dev->device, port))
 287                 return -EINVAL;
 288
 289         supported_gids = roce_gid_type_mask_support(cma_dev->device, port);
 290
 291         if (!(supported_gids & 1 << default_gid_type))
 292                 return -EINVAL;
 293
 294         cma_dev->default_gid_type[port - rdma_start_port(cma_dev->device)] =
 295                 default_gid_type;
 296
 297         return 0;
 298 }
 299
 300 int cma_get_default_roce_tos(struct cma_device *cma_dev, unsigned int port)
 301 {
 302         if (!rdma_is_port_valid(cma_dev->device, port))
 303                 return -EINVAL;
 304
 305         return cma_dev->default_roce_tos[port - rdma_start_port(cma_dev->device)];
 306 }
 307
 308 int cma_set_default_roce_tos(struct cma_device *cma_dev, unsigned int port,
 309                              u8 default_roce_tos)
 310 {
 311         if (!rdma_is_port_valid(cma_dev->device, port))
 312                 return -EINVAL;
 313
 314         cma_dev->default_roce_tos[port - rdma_start_port(cma_dev->device)] =
 315                  default_roce_tos;
 316
 317         return 0;
 318 }
 319 struct ib_device *cma_get_ib_dev(struct cma_device *cma_dev)
 320 {
 321         return cma_dev->device;
 322 }
 323
 324 /*
 325  * Device removal can occur at anytime, so we need extra handling to
 326  * serialize notifying the user of device removal with other callbacks.
 327  * We do this by disabling removal notification while a callback is in process,
 328  * and reporting it after the callback completes.
 329  */
 330 struct rdma_id_private {
 331         struct rdma_cm_id       id;
 332
 333         struct rdma_bind_list   *bind_list;
 334         struct hlist_node       node;
 335         struct list_head        list; /* listen_any_list or cma_device.list */
 336         struct list_head        listen_list; /* per device listens */
 337         struct cma_device       *cma_dev;
 338         struct list_head        mc_list;
 339
 340         int                     internal_id;
 341         enum rdma_cm_state      state;
 342         spinlock_t              lock;
 343         struct mutex            qp_mutex;
 344
 345         struct completion       comp;
 346         atomic_t                refcount;
 347         struct mutex            handler_mutex;
 348
 349         int                     backlog;
 350         int                     timeout_ms;
 351         struct ib_sa_query      *query;
 352         int                     query_id;
 353         union {
 354                 struct ib_cm_id *ib;
 355                 struct iw_cm_id *iw;
 356         } cm_id;
 357
 358         u32                     seq_num;
 359         u32                     qkey;
 360         u32                     qp_num;
 361         pid_t                   owner;
 362         u32                     options;
 363         u8                      srq;
 364         u8                      tos;
 365         bool                    tos_set;
 366         u8                      reuseaddr;
 367         u8                      afonly;
 368         enum ib_gid_type        gid_type;
 369 };
 370
 371 struct cma_multicast {
 372         struct rdma_id_private *id_priv;
 373         union {
 374                 struct ib_sa_multicast *ib;
 375         } multicast;
 376         struct list_head        list;
 377         void                    *context;
 378         struct sockaddr_storage addr;
 379         struct kref             mcref;
 380         bool                    igmp_joined;
 381         u8                      join_state;
 382 };
 383
 384 struct cma_work {
 385         struct work_struct      work;
 386         struct rdma_id_private  *id;
 387         enum rdma_cm_state      old_state;
 388         enum rdma_cm_state      new_state;
 389         struct rdma_cm_event    event;
 390 };
 391
 392 struct cma_ndev_work {
 393         struct work_struct      work;
 394         struct rdma_id_private  *id;
 395         struct rdma_cm_event    event;
 396 };
 397
 398 struct iboe_mcast_work {
 399         struct work_struct       work;
 400         struct rdma_id_private  *id;
 401         struct cma_multicast    *mc;
 402 };
 403
 404 union cma_ip_addr {
 405         struct in6_addr ip6;
 406         struct {
 407                 __be32 pad[3];
 408                 __be32 addr;
 409         } ip4;
 410 };
 411
 412 struct cma_hdr {
 413         u8 cma_version;
 414         u8 ip_version;  /* IP version: 7:4 */
 415         __be16 port;
 416         union cma_ip_addr src_addr;
 417         union cma_ip_addr dst_addr;
 418 };
 419
 420 #define CMA_VERSION 0x00
 421
 422 struct cma_req_info {
 423         struct sockaddr_storage listen_addr_storage;
 424         struct sockaddr_storage src_addr_storage;
 425         struct ib_device *device;
 426         int port;
 427         union ib_gid local_gid;
 428         __be64 service_id;
 429         u16 pkey;
 430         bool has_gid:1;
 431 };
 432
 433 static int cma_comp(struct rdma_id_private *id_priv, enum rdma_cm_state comp)
 434 {
 435         unsigned long flags;
 436         int ret;
 437
 438         spin_lock_irqsave(&id_priv->lock, flags);
 439         ret = (id_priv->state == comp);
 440         spin_unlock_irqrestore(&id_priv->lock, flags);
 441         return ret;
 442 }
 443
 444 static int cma_comp_exch(struct rdma_id_private *id_priv,
 445                          enum rdma_cm_state comp, enum rdma_cm_state exch)
 446 {
 447         unsigned long flags;
 448         int ret;
 449
 450         spin_lock_irqsave(&id_priv->lock, flags);
 451         if ((ret = (id_priv->state == comp)))
 452                 id_priv->state = exch;
 453         spin_unlock_irqrestore(&id_priv->lock, flags);
 454         return ret;
 455 }
 456
 457 static enum rdma_cm_state cma_exch(struct rdma_id_private *id_priv,
 458                                    enum rdma_cm_state exch)
 459 {
 460         unsigned long flags;
 461         enum rdma_cm_state old;
 462
 463         spin_lock_irqsave(&id_priv->lock, flags);
 464         old = id_priv->state;
 465         id_priv->state = exch;
 466         spin_unlock_irqrestore(&id_priv->lock, flags);
 467         return old;
 468 }
 469
 470 static inline u8 cma_get_ip_ver(const struct cma_hdr *hdr)
 471 {
 472         return hdr->ip_version >> 4;
 473 }
 474
 475 static inline void cma_set_ip_ver(struct cma_hdr *hdr, u8 ip_ver)
 476 {
 477         hdr->ip_version = (ip_ver << 4) | (hdr->ip_version & 0xF);
 478 }
 479
 480 static int cma_igmp_send(struct net_device *ndev, union ib_gid *mgid, bool join)
 481 {
 482         struct in_device *in_dev = NULL;
 483
 484         if (ndev) {
 485                 rtnl_lock();
 486                 in_dev = __in_dev_get_rtnl(ndev);
 487                 if (in_dev) {
 488                         if (join)
 489                                 ip_mc_inc_group(in_dev,
 490                                                 *(__be32 *)(mgid->raw + 12));
 491                         else
 492                                 ip_mc_dec_group(in_dev,
 493                                                 *(__be32 *)(mgid->raw + 12));
 494                 }
 495                 rtnl_unlock();
 496         }
 497         return (in_dev) ? 0 : -ENODEV;
 498 }
 499
 500 static void _cma_attach_to_dev(struct rdma_id_private *id_priv,
 501                                struct cma_device *cma_dev)
 502 {
 503         cma_ref_dev(cma_dev);
 504         id_priv->cma_dev = cma_dev;
 505         id_priv->gid_type = 0;
 506         id_priv->id.device = cma_dev->device;
 507         id_priv->id.route.addr.dev_addr.transport =
 508                 rdma_node_get_transport(cma_dev->device->node_type);
 509         list_add_tail(&id_priv->list, &cma_dev->id_list);
 510 }
 511
 512 static void cma_attach_to_dev(struct rdma_id_private *id_priv,
 513                               struct cma_device *cma_dev)
 514 {
 515         _cma_attach_to_dev(id_priv, cma_dev);
 516         id_priv->gid_type =
 517                 cma_dev->default_gid_type[id_priv->id.port_num -
 518                                           rdma_start_port(cma_dev->device)];
 519 }
 520
 521 void cma_deref_dev(struct cma_device *cma_dev)
 522 {
 523         if (atomic_dec_and_test(&cma_dev->refcount))
 524                 complete(&cma_dev->comp);
 525 }
 526
 527 static inline void release_mc(struct kref *kref)
 528 {
 529         struct cma_multicast *mc = container_of(kref, struct cma_multicast, mcref);
 530
 531         kfree(mc->multicast.ib);
 532         kfree(mc);
 533 }
 534
 535 static void cma_release_dev(struct rdma_id_private *id_priv)
 536 {
 537         mutex_lock(&lock);
 538         list_del(&id_priv->list);
 539         cma_deref_dev(id_priv->cma_dev);
 540         id_priv->cma_dev = NULL;
 541         mutex_unlock(&lock);
 542 }
 543
 544 static inline struct sockaddr *cma_src_addr(struct rdma_id_private *id_priv)
 545 {
 546         return (struct sockaddr *) &id_priv->id.route.addr.src_addr;
 547 }
 548
 549 static inline struct sockaddr *cma_dst_addr(struct rdma_id_private *id_priv)
 550 {
 551         return (struct sockaddr *) &id_priv->id.route.addr.dst_addr;
 552 }
 553
 554 static inline unsigned short cma_family(struct rdma_id_private *id_priv)
 555 {
 556         return id_priv->id.route.addr.src_addr.ss_family;
 557 }
 558
 559 static int cma_set_qkey(struct rdma_id_private *id_priv, u32 qkey)
 560 {
 561         struct ib_sa_mcmember_rec rec;
 562         int ret = 0;
 563
 564         if (id_priv->qkey) {
 565                 if (qkey && id_priv->qkey != qkey)
 566                         return -EINVAL;
 567                 return 0;
 568         }
 569
 570         if (qkey) {
 571                 id_priv->qkey = qkey;
 572                 return 0;
 573         }
 574
 575         switch (id_priv->id.ps) {
 576         case RDMA_PS_UDP:
 577         case RDMA_PS_IB:
 578                 id_priv->qkey = RDMA_UDP_QKEY;
 579                 break;
 580         case RDMA_PS_IPOIB:
 581                 ib_addr_get_mgid(&id_priv->id.route.addr.dev_addr, &rec.mgid);
 582                 ret = ib_sa_get_mcmember_rec(id_priv->id.device,
 583                                              id_priv->id.port_num, &rec.mgid,
 584                                              &rec);
 585                 if (!ret)
 586                         id_priv->qkey = be32_to_cpu(rec.qkey);
 587                 break;
 588         default:
 589                 break;
 590         }
 591         return ret;
 592 }
 593
 594 static void cma_translate_ib(struct sockaddr_ib *sib, struct rdma_dev_addr *dev_addr)
 595 {
 596         dev_addr->dev_type = ARPHRD_INFINIBAND;
 597         rdma_addr_set_sgid(dev_addr, (union ib_gid *) &sib->sib_addr);
 598         ib_addr_set_pkey(dev_addr, ntohs(sib->sib_pkey));
 599 }
 600
 601 static int cma_translate_addr(struct sockaddr *addr, struct rdma_dev_addr *dev_addr)
 602 {
 603         int ret;
 604
 605         if (addr->sa_family != AF_IB) {
 606                 ret = rdma_translate_ip(addr, dev_addr, NULL);
 607         } else {
 608                 cma_translate_ib((struct sockaddr_ib *) addr, dev_addr);
 609                 ret = 0;
 610         }
 611
 612         return ret;
 613 }
 614
 615 static inline int cma_validate_port(struct ib_device *device, u8 port,
 616                                     enum ib_gid_type gid_type,
 617                                       union ib_gid *gid, int dev_type,
 618                                       int bound_if_index)
 619 {
 620         int ret = -ENODEV;
 621         struct net_device *ndev = NULL;
 622
 623         if ((dev_type == ARPHRD_INFINIBAND) && !rdma_protocol_ib(device, port))
 624                 return ret;
 625
 626         if ((dev_type != ARPHRD_INFINIBAND) && rdma_protocol_ib(device, port))
 627                 return ret;
 628
 629         if (dev_type == ARPHRD_ETHER && rdma_protocol_roce(device, port)) {
 630                 ndev = dev_get_by_index(&init_net, bound_if_index);
 631                 if (!ndev)
 632                         return ret;
 633         } else {
 634                 gid_type = IB_GID_TYPE_IB;
 635         }
 636
 637         ret = ib_find_cached_gid_by_port(device, gid, gid_type, port,
 638                                          ndev, NULL);
 639
 640         if (ndev)
 641                 dev_put(ndev);
 642
 643         return ret;
 644 }
 645
 646 static int cma_acquire_dev(struct rdma_id_private *id_priv,
 647                            struct rdma_id_private *listen_id_priv)
 648 {
 649         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
 650         struct cma_device *cma_dev;
 651         union ib_gid gid, iboe_gid, *gidp;
 652         int ret = -ENODEV;
 653         u8 port;
 654
 655         if (dev_addr->dev_type != ARPHRD_INFINIBAND &&
 656             id_priv->id.ps == RDMA_PS_IPOIB)
 657                 return -EINVAL;
 658
 659         mutex_lock(&lock);
 660         rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
 661                     &iboe_gid);
 662
 663         memcpy(&gid, dev_addr->src_dev_addr +
 664                rdma_addr_gid_offset(dev_addr), sizeof gid);
 665
 666         if (listen_id_priv) {
 667                 cma_dev = listen_id_priv->cma_dev;
 668                 port = listen_id_priv->id.port_num;
 669                 gidp = rdma_protocol_roce(cma_dev->device, port) ?
 670                        &iboe_gid : &gid;
 671
 672                 ret = cma_validate_port(cma_dev->device, port,
 673                                         rdma_protocol_ib(cma_dev->device, port) ?
 674                                         IB_GID_TYPE_IB :
 675                                         listen_id_priv->gid_type, gidp,
 676                                         dev_addr->dev_type,
 677                                         dev_addr->bound_dev_if);
 678                 if (!ret) {
 679                         id_priv->id.port_num = port;
 680                         goto out;
 681                 }
 682         }
 683
 684         list_for_each_entry(cma_dev, &dev_list, list) {
 685                 for (port = 1; port <= cma_dev->device->phys_port_cnt; ++port) {
 686                         if (listen_id_priv &&
 687                             listen_id_priv->cma_dev == cma_dev &&
 688                             listen_id_priv->id.port_num == port)
 689                                 continue;
 690
 691                         gidp = rdma_protocol_roce(cma_dev->device, port) ?
 692                                &iboe_gid : &gid;
 693
 694                         ret = cma_validate_port(cma_dev->device, port,
 695                                                 rdma_protocol_ib(cma_dev->device, port) ?
 696                                                 IB_GID_TYPE_IB :
 697                                                 cma_dev->default_gid_type[port - 1],
 698                                                 gidp, dev_addr->dev_type,
 699                                                 dev_addr->bound_dev_if);
 700                         if (!ret) {
 701                                 id_priv->id.port_num = port;
 702                                 goto out;
 703                         }
 704                 }
 705         }
 706
 707 out:
 708         if (!ret)
 709                 cma_attach_to_dev(id_priv, cma_dev);
 710
 711         mutex_unlock(&lock);
 712         return ret;
 713 }
 714
 715 /*
 716  * Select the source IB device and address to reach the destination IB address.
 717  */
 718 static int cma_resolve_ib_dev(struct rdma_id_private *id_priv)
 719 {
 720         struct cma_device *cma_dev, *cur_dev;
 721         struct sockaddr_ib *addr;
 722         union ib_gid gid, sgid, *dgid;
 723         u16 pkey, index;
 724         u8 p;
 725         enum ib_port_state port_state;
 726         int i;
 727
 728         cma_dev = NULL;
 729         addr = (struct sockaddr_ib *) cma_dst_addr(id_priv);
 730         dgid = (union ib_gid *) &addr->sib_addr;
 731         pkey = ntohs(addr->sib_pkey);
 732
 733         mutex_lock(&lock);
 734         list_for_each_entry(cur_dev, &dev_list, list) {
 735                 for (p = 1; p <= cur_dev->device->phys_port_cnt; ++p) {
 736                         if (!rdma_cap_af_ib(cur_dev->device, p))
 737                                 continue;
 738
 739                         if (ib_find_cached_pkey(cur_dev->device, p, pkey, &index))
 740                                 continue;
 741
 742                         if (ib_get_cached_port_state(cur_dev->device, p, &port_state))
 743                                 continue;
 744                         for (i = 0; !ib_get_cached_gid(cur_dev->device, p, i,
 745                                                        &gid, NULL);
 746                              i++) {
 747                                 if (!memcmp(&gid, dgid, sizeof(gid))) {
 748                                         cma_dev = cur_dev;
 749                                         sgid = gid;
 750                                         id_priv->id.port_num = p;
 751                                         goto found;
 752                                 }
 753
 754                                 if (!cma_dev && (gid.global.subnet_prefix ==
 755                                     dgid->global.subnet_prefix) &&
 756                                     port_state == IB_PORT_ACTIVE) {
 757                                         cma_dev = cur_dev;
 758                                         sgid = gid;
 759                                         id_priv->id.port_num = p;
 760                                         goto found;
 761                                 }
 762                         }
 763                 }
 764         }
 765         mutex_unlock(&lock);
 766         return -ENODEV;
 767
 768 found:
 769         cma_attach_to_dev(id_priv, cma_dev);
 770         mutex_unlock(&lock);
 771         addr = (struct sockaddr_ib *)cma_src_addr(id_priv);
 772         memcpy(&addr->sib_addr, &sgid, sizeof(sgid));
 773         cma_translate_ib(addr, &id_priv->id.route.addr.dev_addr);
 774         return 0;
 775 }
 776
 777 static void cma_deref_id(struct rdma_id_private *id_priv)
 778 {
 779         if (atomic_dec_and_test(&id_priv->refcount))
 780                 complete(&id_priv->comp);
 781 }
 782
 783 struct rdma_cm_id *rdma_create_id(struct net *net,
 784                                   rdma_cm_event_handler event_handler,
 785                                   void *context, enum rdma_port_space ps,
 786                                   enum ib_qp_type qp_type)
 787 {
 788         struct rdma_id_private *id_priv;
 789
 790         id_priv = kzalloc(sizeof *id_priv, GFP_KERNEL);
 791         if (!id_priv)
 792                 return ERR_PTR(-ENOMEM);
 793
 794         id_priv->owner = task_pid_nr(current);
 795         id_priv->state = RDMA_CM_IDLE;
 796         id_priv->id.context = context;
 797         id_priv->id.event_handler = event_handler;
 798         id_priv->id.ps = ps;
 799         id_priv->id.qp_type = qp_type;
 800         id_priv->tos_set = false;
 801         spin_lock_init(&id_priv->lock);
 802         mutex_init(&id_priv->qp_mutex);
 803         init_completion(&id_priv->comp);
 804         atomic_set(&id_priv->refcount, 1);
 805         mutex_init(&id_priv->handler_mutex);
 806         INIT_LIST_HEAD(&id_priv->listen_list);
 807         INIT_LIST_HEAD(&id_priv->mc_list);
 808         get_random_bytes(&id_priv->seq_num, sizeof id_priv->seq_num);
 809         id_priv->id.route.addr.dev_addr.net = get_net(net);
 810         id_priv->seq_num &= 0x00ffffff;
 811
 812         return &id_priv->id;
 813 }
 814 EXPORT_SYMBOL(rdma_create_id);
 815
 816 static int cma_init_ud_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
 817 {
 818         struct ib_qp_attr qp_attr;
 819         int qp_attr_mask, ret;
 820
 821         qp_attr.qp_state = IB_QPS_INIT;
 822         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 823         if (ret)
 824                 return ret;
 825
 826         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 827         if (ret)
 828                 return ret;
 829
 830         qp_attr.qp_state = IB_QPS_RTR;
 831         ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
 832         if (ret)
 833                 return ret;
 834
 835         qp_attr.qp_state = IB_QPS_RTS;
 836         qp_attr.sq_psn = 0;
 837         ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE | IB_QP_SQ_PSN);
 838
 839         return ret;
 840 }
 841
 842 static int cma_init_conn_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
 843 {
 844         struct ib_qp_attr qp_attr;
 845         int qp_attr_mask, ret;
 846
 847         qp_attr.qp_state = IB_QPS_INIT;
 848         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 849         if (ret)
 850                 return ret;
 851
 852         return ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 853 }
 854
 855 int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
 856                    struct ib_qp_init_attr *qp_init_attr)
 857 {
 858         struct rdma_id_private *id_priv;
 859         struct ib_qp *qp;
 860         int ret;
 861
 862         id_priv = container_of(id, struct rdma_id_private, id);
 863         if (id->device != pd->device)
 864                 return -EINVAL;
 865
 866         qp_init_attr->port_num = id->port_num;
 867         qp = ib_create_qp(pd, qp_init_attr);
 868         if (IS_ERR(qp))
 869                 return PTR_ERR(qp);
 870
 871         if (id->qp_type == IB_QPT_UD)
 872                 ret = cma_init_ud_qp(id_priv, qp);
 873         else
 874                 ret = cma_init_conn_qp(id_priv, qp);
 875         if (ret)
 876                 goto err;
 877
 878         id->qp = qp;
 879         id_priv->qp_num = qp->qp_num;
 880         id_priv->srq = (qp->srq != NULL);
 881         return 0;
 882 err:
 883         ib_destroy_qp(qp);
 884         return ret;
 885 }
 886 EXPORT_SYMBOL(rdma_create_qp);
 887
 888 void rdma_destroy_qp(struct rdma_cm_id *id)
 889 {
 890         struct rdma_id_private *id_priv;
 891
 892         id_priv = container_of(id, struct rdma_id_private, id);
 893         mutex_lock(&id_priv->qp_mutex);
 894         ib_destroy_qp(id_priv->id.qp);
 895         id_priv->id.qp = NULL;
 896         mutex_unlock(&id_priv->qp_mutex);
 897 }
 898 EXPORT_SYMBOL(rdma_destroy_qp);
 899
 900 static int cma_modify_qp_rtr(struct rdma_id_private *id_priv,
 901                              struct rdma_conn_param *conn_param)
 902 {
 903         struct ib_qp_attr qp_attr;
 904         int qp_attr_mask, ret;
 905
 906         mutex_lock(&id_priv->qp_mutex);
 907         if (!id_priv->id.qp) {
 908                 ret = 0;
 909                 goto out;
 910         }
 911
 912         /* Need to update QP attributes from default values. */
 913         qp_attr.qp_state = IB_QPS_INIT;
 914         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 915         if (ret)
 916                 goto out;
 917
 918         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
 919         if (ret)
 920                 goto out;
 921
 922         qp_attr.qp_state = IB_QPS_RTR;
 923         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 924         if (ret)
 925                 goto out;
 926
 927         BUG_ON(id_priv->cma_dev->device != id_priv->id.device);
 928
 929         if (conn_param)
 930                 qp_attr.max_dest_rd_atomic = conn_param->responder_resources;
 931         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
 932 out:
 933         mutex_unlock(&id_priv->qp_mutex);
 934         return ret;
 935 }
 936
 937 static int cma_modify_qp_rts(struct rdma_id_private *id_priv,
 938                              struct rdma_conn_param *conn_param)
 939 {
 940         struct ib_qp_attr qp_attr;
 941         int qp_attr_mask, ret;
 942
 943         mutex_lock(&id_priv->qp_mutex);
 944         if (!id_priv->id.qp) {
 945                 ret = 0;
 946                 goto out;
 947         }
 948
 949         qp_attr.qp_state = IB_QPS_RTS;
 950         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 951         if (ret)
 952                 goto out;
 953
 954         if (conn_param)
 955                 qp_attr.max_rd_atomic = conn_param->initiator_depth;
 956         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
 957 out:
 958         mutex_unlock(&id_priv->qp_mutex);
 959         return ret;
 960 }
 961
 962 static int cma_modify_qp_err(struct rdma_id_private *id_priv)
 963 {
 964         struct ib_qp_attr qp_attr;
 965         int ret;
 966
 967         mutex_lock(&id_priv->qp_mutex);
 968         if (!id_priv->id.qp) {
 969                 ret = 0;
 970                 goto out;
 971         }
 972
 973         qp_attr.qp_state = IB_QPS_ERR;
 974         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, IB_QP_STATE);
 975 out:
 976         mutex_unlock(&id_priv->qp_mutex);
 977         return ret;
 978 }
 979
 980 static int cma_ib_init_qp_attr(struct rdma_id_private *id_priv,
 981                                struct ib_qp_attr *qp_attr, int *qp_attr_mask)
 982 {
 983         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
 984         int ret;
 985         u16 pkey;
 986
 987         if (rdma_cap_eth_ah(id_priv->id.device, id_priv->id.port_num))
 988                 pkey = 0xffff;
 989         else
 990                 pkey = ib_addr_get_pkey(dev_addr);
 991
 992         ret = ib_find_cached_pkey(id_priv->id.device, id_priv->id.port_num,
 993                                   pkey, &qp_attr->pkey_index);
 994         if (ret)
 995                 return ret;
 996
 997         qp_attr->port_num = id_priv->id.port_num;
 998         *qp_attr_mask = IB_QP_STATE | IB_QP_PKEY_INDEX | IB_QP_PORT;
 999
1000         if (id_priv->id.qp_type == IB_QPT_UD) {
1001                 ret = cma_set_qkey(id_priv, 0);
1002                 if (ret)
1003                         return ret;
1004
1005                 qp_attr->qkey = id_priv->qkey;
1006                 *qp_attr_mask |= IB_QP_QKEY;
1007         } else {
1008                 qp_attr->qp_access_flags = 0;
1009                 *qp_attr_mask |= IB_QP_ACCESS_FLAGS;
1010         }
1011         return 0;
1012 }
1013
1014 int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
1015                        int *qp_attr_mask)
1016 {
1017         struct rdma_id_private *id_priv;
1018         int ret = 0;
1019
1020         id_priv = container_of(id, struct rdma_id_private, id);
1021         if (rdma_cap_ib_cm(id->device, id->port_num)) {
1022                 if (!id_priv->cm_id.ib || (id_priv->id.qp_type == IB_QPT_UD))
1023                         ret = cma_ib_init_qp_attr(id_priv, qp_attr, qp_attr_mask);
1024                 else
1025                         ret = ib_cm_init_qp_attr(id_priv->cm_id.ib, qp_attr,
1026                                                  qp_attr_mask);
1027
1028                 if (qp_attr->qp_state == IB_QPS_RTR)
1029                         qp_attr->rq_psn = id_priv->seq_num;
1030         } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
1031                 if (!id_priv->cm_id.iw) {
1032                         qp_attr->qp_access_flags = 0;
1033                         *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS;
1034                 } else
1035                         ret = iw_cm_init_qp_attr(id_priv->cm_id.iw, qp_attr,
1036                                                  qp_attr_mask);
1037                 qp_attr->port_num = id_priv->id.port_num;
1038                 *qp_attr_mask |= IB_QP_PORT;
1039         } else
1040                 ret = -ENOSYS;
1041
1042         return ret;
1043 }
1044 EXPORT_SYMBOL(rdma_init_qp_attr);
1045
1046 static inline int cma_zero_addr(struct sockaddr *addr)
1047 {
1048         switch (addr->sa_family) {
1049         case AF_INET:
1050                 return ipv4_is_zeronet(((struct sockaddr_in *)addr)->sin_addr.s_addr);
1051         case AF_INET6:
1052                 return ipv6_addr_any(&((struct sockaddr_in6 *) addr)->sin6_addr);
1053         case AF_IB:
1054                 return ib_addr_any(&((struct sockaddr_ib *) addr)->sib_addr);
1055         default:
1056                 return 0;
1057         }
1058 }
1059
1060 static inline int cma_loopback_addr(struct sockaddr *addr)
1061 {
1062         switch (addr->sa_family) {
1063         case AF_INET:
1064                 return ipv4_is_loopback(((struct sockaddr_in *) addr)->sin_addr.s_addr);
1065         case AF_INET6:
1066                 return ipv6_addr_loopback(&((struct sockaddr_in6 *) addr)->sin6_addr);
1067         case AF_IB:
1068                 return ib_addr_loopback(&((struct sockaddr_ib *) addr)->sib_addr);
1069         default:
1070                 return 0;
1071         }
1072 }
1073
1074 static inline int cma_any_addr(struct sockaddr *addr)
1075 {
1076         return cma_zero_addr(addr) || cma_loopback_addr(addr);
1077 }
1078
1079 static int cma_addr_cmp(struct sockaddr *src, struct sockaddr *dst)
1080 {
1081         if (src->sa_family != dst->sa_family)
1082                 return -1;
1083
1084         switch (src->sa_family) {
1085         case AF_INET:
1086                 return ((struct sockaddr_in *) src)->sin_addr.s_addr !=
1087                        ((struct sockaddr_in *) dst)->sin_addr.s_addr;
1088         case AF_INET6:
1089                 return ipv6_addr_cmp(&((struct sockaddr_in6 *) src)->sin6_addr,
1090                                      &((struct sockaddr_in6 *) dst)->sin6_addr);
1091         default:
1092                 return ib_addr_cmp(&((struct sockaddr_ib *) src)->sib_addr,
1093                                    &((struct sockaddr_ib *) dst)->sib_addr);
1094         }
1095 }
1096
1097 static __be16 cma_port(struct sockaddr *addr)
1098 {
1099         struct sockaddr_ib *sib;
1100
1101         switch (addr->sa_family) {
1102         case AF_INET:
1103                 return ((struct sockaddr_in *) addr)->sin_port;
1104         case AF_INET6:
1105                 return ((struct sockaddr_in6 *) addr)->sin6_port;
1106         case AF_IB:
1107                 sib = (struct sockaddr_ib *) addr;
1108                 return htons((u16) (be64_to_cpu(sib->sib_sid) &
1109                                     be64_to_cpu(sib->sib_sid_mask)));
1110         default:
1111                 return 0;
1112         }
1113 }
1114
1115 static inline int cma_any_port(struct sockaddr *addr)
1116 {
1117         return !cma_port(addr);
1118 }
1119
1120 static void cma_save_ib_info(struct sockaddr *src_addr,
1121                              struct sockaddr *dst_addr,
1122                              struct rdma_cm_id *listen_id,
1123                              struct sa_path_rec *path)
1124 {
1125         struct sockaddr_ib *listen_ib, *ib;
1126
1127         listen_ib = (struct sockaddr_ib *) &listen_id->route.addr.src_addr;
1128         if (src_addr) {
1129                 ib = (struct sockaddr_ib *)src_addr;
1130                 ib->sib_family = AF_IB;
1131                 if (path) {
1132                         ib->sib_pkey = path->pkey;
1133                         ib->sib_flowinfo = path->flow_label;
1134                         memcpy(&ib->sib_addr, &path->sgid, 16);
1135                         ib->sib_sid = path->service_id;
1136                         ib->sib_scope_id = 0;
1137                 } else {
1138                         ib->sib_pkey = listen_ib->sib_pkey;
1139                         ib->sib_flowinfo = listen_ib->sib_flowinfo;
1140                         ib->sib_addr = listen_ib->sib_addr;
1141                         ib->sib_sid = listen_ib->sib_sid;
1142                         ib->sib_scope_id = listen_ib->sib_scope_id;
1143                 }
1144                 ib->sib_sid_mask = cpu_to_be64(0xffffffffffffffffULL);
1145         }
1146         if (dst_addr) {
1147                 ib = (struct sockaddr_ib *)dst_addr;
1148                 ib->sib_family = AF_IB;
1149                 if (path) {
1150                         ib->sib_pkey = path->pkey;
1151                         ib->sib_flowinfo = path->flow_label;
1152                         memcpy(&ib->sib_addr, &path->dgid, 16);
1153                 }
1154         }
1155 }
1156
1157 static void cma_save_ip4_info(struct sockaddr_in *src_addr,
1158                               struct sockaddr_in *dst_addr,
1159                               struct cma_hdr *hdr,
1160                               __be16 local_port)
1161 {
1162         if (src_addr) {
1163                 *src_addr = (struct sockaddr_in) {
1164                         .sin_family = AF_INET,
1165                         .sin_addr.s_addr = hdr->dst_addr.ip4.addr,
1166                         .sin_port = local_port,
1167                 };
1168         }
1169
1170         if (dst_addr) {
1171                 *dst_addr = (struct sockaddr_in) {
1172                         .sin_family = AF_INET,
1173                         .sin_addr.s_addr = hdr->src_addr.ip4.addr,
1174                         .sin_port = hdr->port,
1175                 };
1176         }
1177 }
1178
1179 static void cma_save_ip6_info(struct sockaddr_in6 *src_addr,
1180                               struct sockaddr_in6 *dst_addr,
1181                               struct cma_hdr *hdr,
1182                               __be16 local_port)
1183 {
1184         if (src_addr) {
1185                 *src_addr = (struct sockaddr_in6) {
1186                         .sin6_family = AF_INET6,
1187                         .sin6_addr = hdr->dst_addr.ip6,
1188                         .sin6_port = local_port,
1189                 };
1190         }
1191
1192         if (dst_addr) {
1193                 *dst_addr = (struct sockaddr_in6) {
1194                         .sin6_family = AF_INET6,
1195                         .sin6_addr = hdr->src_addr.ip6,
1196                         .sin6_port = hdr->port,
1197                 };
1198         }
1199 }
1200
1201 static u16 cma_port_from_service_id(__be64 service_id)
1202 {
1203         return (u16)be64_to_cpu(service_id);
1204 }
1205
1206 static int cma_save_ip_info(struct sockaddr *src_addr,
1207                             struct sockaddr *dst_addr,
1208                             struct ib_cm_event *ib_event,
1209                             __be64 service_id)
1210 {
1211         struct cma_hdr *hdr;
1212         __be16 port;
1213
1214         hdr = ib_event->private_data;
1215         if (hdr->cma_version != CMA_VERSION)
1216                 return -EINVAL;
1217
1218         port = htons(cma_port_from_service_id(service_id));
1219
1220         switch (cma_get_ip_ver(hdr)) {
1221         case 4:
1222                 cma_save_ip4_info((struct sockaddr_in *)src_addr,
1223                                   (struct sockaddr_in *)dst_addr, hdr, port);
1224                 break;
1225         case 6:
1226                 cma_save_ip6_info((struct sockaddr_in6 *)src_addr,
1227                                   (struct sockaddr_in6 *)dst_addr, hdr, port);
1228                 break;
1229         default:
1230                 return -EAFNOSUPPORT;
1231         }
1232
1233         return 0;
1234 }
1235
1236 static int cma_save_net_info(struct sockaddr *src_addr,
1237                              struct sockaddr *dst_addr,
1238                              struct rdma_cm_id *listen_id,
1239                              struct ib_cm_event *ib_event,
1240                              sa_family_t sa_family, __be64 service_id)
1241 {
1242         if (sa_family == AF_IB) {
1243                 if (ib_event->event == IB_CM_REQ_RECEIVED)
1244                         cma_save_ib_info(src_addr, dst_addr, listen_id,
1245                                          ib_event->param.req_rcvd.primary_path);
1246                 else if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED)
1247                         cma_save_ib_info(src_addr, dst_addr, listen_id, NULL);
1248                 return 0;
1249         }
1250
1251         return cma_save_ip_info(src_addr, dst_addr, ib_event, service_id);
1252 }
1253
1254 static int cma_save_req_info(const struct ib_cm_event *ib_event,
1255                              struct cma_req_info *req)
1256 {
1257         const struct ib_cm_req_event_param *req_param =
1258                 &ib_event->param.req_rcvd;
1259         const struct ib_cm_sidr_req_event_param *sidr_param =
1260                 &ib_event->param.sidr_req_rcvd;
1261
1262         switch (ib_event->event) {
1263         case IB_CM_REQ_RECEIVED:
1264                 req->device     = req_param->listen_id->device;
1265                 req->port       = req_param->port;
1266                 memcpy(&req->local_gid, &req_param->primary_path->sgid,
1267                        sizeof(req->local_gid));
1268                 req->has_gid    = true;
1269                 req->service_id = req_param->primary_path->service_id;
1270                 req->pkey       = be16_to_cpu(req_param->primary_path->pkey);
1271                 if (req->pkey != req_param->bth_pkey)
1272                         pr_warn_ratelimited("RDMA CMA: got different BTH P_Key (0x%x) and primary path P_Key (0x%x)\n"
1273                                             "RDMA CMA: in the future this may cause the request to be dropped\n",
1274                                             req_param->bth_pkey, req->pkey);
1275                 break;
1276         case IB_CM_SIDR_REQ_RECEIVED:
1277                 req->device     = sidr_param->listen_id->device;
1278                 req->port       = sidr_param->port;
1279                 req->has_gid    = false;
1280                 req->service_id = sidr_param->service_id;
1281                 req->pkey       = sidr_param->pkey;
1282                 if (req->pkey != sidr_param->bth_pkey)
1283                         pr_warn_ratelimited("RDMA CMA: got different BTH P_Key (0x%x) and SIDR request payload P_Key (0x%x)\n"
1284                                             "RDMA CMA: in the future this may cause the request to be dropped\n",
1285                                             sidr_param->bth_pkey, req->pkey);
1286                 break;
1287         default:
1288                 return -EINVAL;
1289         }
1290
1291         return 0;
1292 }
1293
1294 static bool validate_ipv4_net_dev(struct net_device *net_dev,
1295                                   const struct sockaddr_in *dst_addr,
1296                                   const struct sockaddr_in *src_addr)
1297 {
1298         __be32 daddr = dst_addr->sin_addr.s_addr,
1299                saddr = src_addr->sin_addr.s_addr;
1300         struct fib_result res;
1301         struct flowi4 fl4;
1302         int err;
1303         bool ret;
1304
1305         if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) ||
1306             ipv4_is_lbcast(daddr) || ipv4_is_zeronet(saddr) ||
1307             ipv4_is_zeronet(daddr) || ipv4_is_loopback(daddr) ||
1308             ipv4_is_loopback(saddr))
1309                 return false;
1310
1311         memset(&fl4, 0, sizeof(fl4));
1312         fl4.flowi4_iif = net_dev->ifindex;
1313         fl4.daddr = daddr;
1314         fl4.saddr = saddr;
1315
1316         rcu_read_lock();
1317         err = fib_lookup(dev_net(net_dev), &fl4, &res, 0);
1318         ret = err == 0 && FIB_RES_DEV(res) == net_dev;
1319         rcu_read_unlock();
1320
1321         return ret;
1322 }
1323
1324 static bool validate_ipv6_net_dev(struct net_device *net_dev,
1325                                   const struct sockaddr_in6 *dst_addr,
1326                                   const struct sockaddr_in6 *src_addr)
1327 {
1328 #if IS_ENABLED(CONFIG_IPV6)
1329         const int strict = ipv6_addr_type(&dst_addr->sin6_addr) &
1330                            IPV6_ADDR_LINKLOCAL;
1331         struct rt6_info *rt = rt6_lookup(dev_net(net_dev), &dst_addr->sin6_addr,
1332                                          &src_addr->sin6_addr, net_dev->ifindex,
1333                                          strict);
1334         bool ret;
1335
1336         if (!rt)
1337                 return false;
1338
1339         ret = rt->rt6i_idev->dev == net_dev;
1340         ip6_rt_put(rt);
1341
1342         return ret;
1343 #else
1344         return false;
1345 #endif
1346 }
1347
1348 static bool validate_net_dev(struct net_device *net_dev,
1349                              const struct sockaddr *daddr,
1350                              const struct sockaddr *saddr)
1351 {
1352         const struct sockaddr_in *daddr4 = (const struct sockaddr_in *)daddr;
1353         const struct sockaddr_in *saddr4 = (const struct sockaddr_in *)saddr;
1354         const struct sockaddr_in6 *daddr6 = (const struct sockaddr_in6 *)daddr;
1355         const struct sockaddr_in6 *saddr6 = (const struct sockaddr_in6 *)saddr;
1356
1357         switch (daddr->sa_family) {
1358         case AF_INET:
1359                 return saddr->sa_family == AF_INET &&
1360                        validate_ipv4_net_dev(net_dev, daddr4, saddr4);
1361
1362         case AF_INET6:
1363                 return saddr->sa_family == AF_INET6 &&
1364                        validate_ipv6_net_dev(net_dev, daddr6, saddr6);
1365
1366         default:
1367                 return false;
1368         }
1369 }
1370
1371 static struct net_device *cma_get_net_dev(struct ib_cm_event *ib_event,
1372                                           struct cma_req_info *req)
1373 {
1374         struct sockaddr *listen_addr =
1375                         (struct sockaddr *)&req->listen_addr_storage;
1376         struct sockaddr *src_addr = (struct sockaddr *)&req->src_addr_storage;
1377         struct net_device *net_dev;
1378         const union ib_gid *gid = req->has_gid ? &req->local_gid : NULL;
1379         int err;
1380
1381         err = cma_save_ip_info(listen_addr, src_addr, ib_event,
1382                                req->service_id);
1383         if (err)
1384                 return ERR_PTR(err);
1385
1386         net_dev = ib_get_net_dev_by_params(req->device, req->port, req->pkey,
1387                                            gid, listen_addr);
1388         if (!net_dev)
1389                 return ERR_PTR(-ENODEV);
1390
1391         return net_dev;
1392 }
1393
1394 static enum rdma_port_space rdma_ps_from_service_id(__be64 service_id)
1395 {
1396         return (be64_to_cpu(service_id) >> 16) & 0xffff;
1397 }
1398
1399 static bool cma_match_private_data(struct rdma_id_private *id_priv,
1400                                    const struct cma_hdr *hdr)
1401 {
1402         struct sockaddr *addr = cma_src_addr(id_priv);
1403         __be32 ip4_addr;
1404         struct in6_addr ip6_addr;
1405
1406         if (cma_any_addr(addr) && !id_priv->afonly)
1407                 return true;
1408
1409         switch (addr->sa_family) {
1410         case AF_INET:
1411                 ip4_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
1412                 if (cma_get_ip_ver(hdr) != 4)
1413                         return false;
1414                 if (!cma_any_addr(addr) &&
1415                     hdr->dst_addr.ip4.addr != ip4_addr)
1416                         return false;
1417                 break;
1418         case AF_INET6:
1419                 ip6_addr = ((struct sockaddr_in6 *)addr)->sin6_addr;
1420                 if (cma_get_ip_ver(hdr) != 6)
1421                         return false;
1422                 if (!cma_any_addr(addr) &&
1423                     memcmp(&hdr->dst_addr.ip6, &ip6_addr, sizeof(ip6_addr)))
1424                         return false;
1425                 break;
1426         case AF_IB:
1427                 return true;
1428         default:
1429                 return false;
1430         }
1431
1432         return true;
1433 }
1434
1435 static bool cma_protocol_roce_dev_port(struct ib_device *device, int port_num)
1436 {
1437         enum rdma_link_layer ll = rdma_port_get_link_layer(device, port_num);
1438         enum rdma_transport_type transport =
1439                 rdma_node_get_transport(device->node_type);
1440
1441         return ll == IB_LINK_LAYER_ETHERNET && transport == RDMA_TRANSPORT_IB;
1442 }
1443
1444 static bool cma_protocol_roce(const struct rdma_cm_id *id)
1445 {
1446         struct ib_device *device = id->device;
1447         const int port_num = id->port_num ?: rdma_start_port(device);
1448
1449         return cma_protocol_roce_dev_port(device, port_num);
1450 }
1451
1452 static bool cma_match_net_dev(const struct rdma_cm_id *id,
1453                               const struct net_device *net_dev,
1454                               u8 port_num)
1455 {
1456         const struct rdma_addr *addr = &id->route.addr;
1457
1458         if (!net_dev)
1459                 /* This request is an AF_IB request or a RoCE request */
1460                 return (!id->port_num || id->port_num == port_num) &&
1461                        (addr->src_addr.ss_family == AF_IB ||
1462                         cma_protocol_roce_dev_port(id->device, port_num));
1463
1464         /*
1465          * Net namespaces must match, and if the listner is listening
1466          * on a specific netdevice than netdevice must match as well.
1467          */
1468         if (net_eq(dev_net(net_dev), addr->dev_addr.net) &&
1469             (!!addr->dev_addr.bound_dev_if ==
1470              (addr->dev_addr.bound_dev_if == net_dev->ifindex)))
1471                 return true;
1472         else
1473                 return false;
1474 }
1475
1476 static struct rdma_id_private *cma_find_listener(
1477                 const struct rdma_bind_list *bind_list,
1478                 const struct ib_cm_id *cm_id,
1479                 const struct ib_cm_event *ib_event,
1480                 const struct cma_req_info *req,
1481                 const struct net_device *net_dev)
1482 {
1483         struct rdma_id_private *id_priv, *id_priv_dev;
1484
1485         lockdep_assert_held(&lock);
1486
1487         if (!bind_list)
1488                 return ERR_PTR(-EINVAL);
1489
1490         hlist_for_each_entry(id_priv, &bind_list->owners, node) {
1491                 if (cma_match_private_data(id_priv, ib_event->private_data)) {
1492                         if (id_priv->id.device == cm_id->device &&
1493                             cma_match_net_dev(&id_priv->id, net_dev, req->port))
1494                                 return id_priv;
1495                         list_for_each_entry(id_priv_dev,
1496                                             &id_priv->listen_list,
1497                                             listen_list) {
1498                                 if (id_priv_dev->id.device == cm_id->device &&
1499                                     cma_match_net_dev(&id_priv_dev->id, net_dev, req->port))
1500                                         return id_priv_dev;
1501                         }
1502                 }
1503         }
1504
1505         return ERR_PTR(-EINVAL);
1506 }
1507
1508 static struct rdma_id_private *cma_id_from_event(struct ib_cm_id *cm_id,
1509                                                  struct ib_cm_event *ib_event,
1510                                                  struct net_device **net_dev)
1511 {
1512         struct cma_req_info req;
1513         struct rdma_bind_list *bind_list;
1514         struct rdma_id_private *id_priv;
1515         int err;
1516
1517         err = cma_save_req_info(ib_event, &req);
1518         if (err)
1519                 return ERR_PTR(err);
1520
1521         *net_dev = cma_get_net_dev(ib_event, &req);
1522         if (IS_ERR(*net_dev)) {
1523                 if (PTR_ERR(*net_dev) == -EAFNOSUPPORT) {
1524                         /* Assuming the protocol is AF_IB */
1525                         *net_dev = NULL;
1526                 } else if (cma_protocol_roce_dev_port(req.device, req.port)) {
1527                         /* TODO find the net dev matching the request parameters
1528                          * through the RoCE GID table */
1529                         *net_dev = NULL;
1530                 } else {
1531                         return ERR_CAST(*net_dev);
1532                 }
1533         }
1534
1535         mutex_lock(&lock);
1536         /*
1537          * Net namespace might be getting deleted while route lookup,
1538          * cm_id lookup is in progress. Therefore, perform netdevice
1539          * validation, cm_id lookup under rcu lock.
1540          * RCU lock along with netdevice state check, synchronizes with
1541          * netdevice migrating to different net namespace and also avoids
1542          * case where net namespace doesn't get deleted while lookup is in
1543          * progress.
1544          * If the device state is not IFF_UP, its properties such as ifindex
1545          * and nd_net cannot be trusted to remain valid without rcu lock.
1546          * net/core/dev.c change_net_namespace() ensures to synchronize with
1547          * ongoing operations on net device after device is closed using
1548          * synchronize_net().
1549          */
1550         rcu_read_lock();
1551         if (*net_dev) {
1552                 /*
1553                  * If netdevice is down, it is likely that it is administratively
1554                  * down or it might be migrating to different namespace.
1555                  * In that case avoid further processing, as the net namespace
1556                  * or ifindex may change.
1557                  */
1558                 if (((*net_dev)->flags & IFF_UP) == 0) {
1559                         id_priv = ERR_PTR(-EHOSTUNREACH);
1560                         goto err;
1561                 }
1562
1563                 if (!validate_net_dev(*net_dev,
1564                                  (struct sockaddr *)&req.listen_addr_storage,
1565                                  (struct sockaddr *)&req.src_addr_storage)) {
1566                         id_priv = ERR_PTR(-EHOSTUNREACH);
1567                         goto err;
1568                 }
1569         }
1570
1571         bind_list = cma_ps_find(*net_dev ? dev_net(*net_dev) : &init_net,
1572                                 rdma_ps_from_service_id(req.service_id),
1573                                 cma_port_from_service_id(req.service_id));
1574         id_priv = cma_find_listener(bind_list, cm_id, ib_event, &req, *net_dev);
1575 err:
1576         rcu_read_unlock();
1577         mutex_unlock(&lock);
1578         if (IS_ERR(id_priv) && *net_dev) {
1579                 dev_put(*net_dev);
1580                 *net_dev = NULL;
1581         }
1582         return id_priv;
1583 }
1584
1585 static inline u8 cma_user_data_offset(struct rdma_id_private *id_priv)
1586 {
1587         return cma_family(id_priv) == AF_IB ? 0 : sizeof(struct cma_hdr);
1588 }
1589
1590 static void cma_cancel_route(struct rdma_id_private *id_priv)
1591 {
1592         if (rdma_cap_ib_sa(id_priv->id.device, id_priv->id.port_num)) {
1593                 if (id_priv->query)
1594                         ib_sa_cancel_query(id_priv->query_id, id_priv->query);
1595         }
1596 }
1597
1598 static void cma_cancel_listens(struct rdma_id_private *id_priv)
1599 {
1600         struct rdma_id_private *dev_id_priv;
1601
1602         /*
1603          * Remove from listen_any_list to prevent added devices from spawning
1604          * additional listen requests.
1605          */
1606         mutex_lock(&lock);
1607         list_del(&id_priv->list);
1608
1609         while (!list_empty(&id_priv->listen_list)) {
1610                 dev_id_priv = list_entry(id_priv->listen_list.next,
1611                                          struct rdma_id_private, listen_list);
1612                 /* sync with device removal to avoid duplicate destruction */
1613                 list_del_init(&dev_id_priv->list);
1614                 list_del(&dev_id_priv->listen_list);
1615                 mutex_unlock(&lock);
1616
1617                 rdma_destroy_id(&dev_id_priv->id);
1618                 mutex_lock(&lock);
1619         }
1620         mutex_unlock(&lock);
1621 }
1622
1623 static void cma_cancel_operation(struct rdma_id_private *id_priv,
1624                                  enum rdma_cm_state state)
1625 {
1626         switch (state) {
1627         case RDMA_CM_ADDR_QUERY:
1628                 rdma_addr_cancel(&id_priv->id.route.addr.dev_addr);
1629                 break;
1630         case RDMA_CM_ROUTE_QUERY:
1631                 cma_cancel_route(id_priv);
1632                 break;
1633         case RDMA_CM_LISTEN:
1634                 if (cma_any_addr(cma_src_addr(id_priv)) && !id_priv->cma_dev)
1635                         cma_cancel_listens(id_priv);
1636                 break;
1637         default:
1638                 break;
1639         }
1640 }
1641
1642 static void cma_release_port(struct rdma_id_private *id_priv)
1643 {
1644         struct rdma_bind_list *bind_list = id_priv->bind_list;
1645         struct net *net = id_priv->id.route.addr.dev_addr.net;
1646
1647         if (!bind_list)
1648                 return;
1649
1650         mutex_lock(&lock);
1651         hlist_del(&id_priv->node);
1652         if (hlist_empty(&bind_list->owners)) {
1653                 cma_ps_remove(net, bind_list->ps, bind_list->port);
1654                 kfree(bind_list);
1655         }
1656         mutex_unlock(&lock);
1657 }
1658
1659 static void cma_leave_mc_groups(struct rdma_id_private *id_priv)
1660 {
1661         struct cma_multicast *mc;
1662
1663         while (!list_empty(&id_priv->mc_list)) {
1664                 mc = container_of(id_priv->mc_list.next,
1665                                   struct cma_multicast, list);
1666                 list_del(&mc->list);
1667                 if (rdma_cap_ib_mcast(id_priv->cma_dev->device,
1668                                       id_priv->id.port_num)) {
1669                         ib_sa_free_multicast(mc->multicast.ib);
1670                         kfree(mc);
1671                 } else {
1672                         if (mc->igmp_joined) {
1673                                 struct rdma_dev_addr *dev_addr =
1674                                         &id_priv->id.route.addr.dev_addr;
1675                                 struct net_device *ndev = NULL;
1676
1677                                 if (dev_addr->bound_dev_if)
1678                                         ndev = dev_get_by_index(&init_net,
1679                                                                 dev_addr->bound_dev_if);
1680                                 if (ndev) {
1681                                         cma_igmp_send(ndev,
1682                                                       &mc->multicast.ib->rec.mgid,
1683                                                       false);
1684                                         dev_put(ndev);
1685                                 }
1686                         }
1687                         kref_put(&mc->mcref, release_mc);
1688                 }
1689         }
1690 }
1691
1692 void rdma_destroy_id(struct rdma_cm_id *id)
1693 {
1694         struct rdma_id_private *id_priv;
1695         enum rdma_cm_state state;
1696
1697         id_priv = container_of(id, struct rdma_id_private, id);
1698         state = cma_exch(id_priv, RDMA_CM_DESTROYING);
1699         cma_cancel_operation(id_priv, state);
1700
1701         /*
1702          * Wait for any active callback to finish.  New callbacks will find
1703          * the id_priv state set to destroying and abort.
1704          */
1705         mutex_lock(&id_priv->handler_mutex);
1706         mutex_unlock(&id_priv->handler_mutex);
1707
1708         if (id_priv->cma_dev) {
1709                 if (rdma_cap_ib_cm(id_priv->id.device, 1)) {
1710                         if (id_priv->cm_id.ib)
1711                                 ib_destroy_cm_id(id_priv->cm_id.ib);
1712                 } else if (rdma_cap_iw_cm(id_priv->id.device, 1)) {
1713                         if (id_priv->cm_id.iw)
1714                                 iw_destroy_cm_id(id_priv->cm_id.iw);
1715                 }
1716                 cma_leave_mc_groups(id_priv);
1717                 cma_release_dev(id_priv);
1718         }
1719
1720         cma_release_port(id_priv);
1721         cma_deref_id(id_priv);
1722         wait_for_completion(&id_priv->comp);
1723
1724         if (id_priv->internal_id)
1725                 cma_deref_id(id_priv->id.context);
1726
1727         kfree(id_priv->id.route.path_rec);
1728         put_net(id_priv->id.route.addr.dev_addr.net);
1729         kfree(id_priv);
1730 }
1731 EXPORT_SYMBOL(rdma_destroy_id);
1732
1733 static int cma_rep_recv(struct rdma_id_private *id_priv)
1734 {
1735         int ret;
1736
1737         ret = cma_modify_qp_rtr(id_priv, NULL);
1738         if (ret)
1739                 goto reject;
1740
1741         ret = cma_modify_qp_rts(id_priv, NULL);
1742         if (ret)
1743                 goto reject;
1744
1745         ret = ib_send_cm_rtu(id_priv->cm_id.ib, NULL, 0);
1746         if (ret)
1747                 goto reject;
1748
1749         return 0;
1750 reject:
1751         pr_debug_ratelimited("RDMA CM: CONNECT_ERROR: failed to handle reply. status %d\n", ret);
1752         cma_modify_qp_err(id_priv);
1753         ib_send_cm_rej(id_priv->cm_id.ib, IB_CM_REJ_CONSUMER_DEFINED,
1754                        NULL, 0, NULL, 0);
1755         return ret;
1756 }
1757
1758 static void cma_set_rep_event_data(struct rdma_cm_event *event,
1759                                    struct ib_cm_rep_event_param *rep_data,
1760                                    void *private_data)
1761 {
1762         event->param.conn.private_data = private_data;
1763         event->param.conn.private_data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
1764         event->param.conn.responder_resources = rep_data->responder_resources;
1765         event->param.conn.initiator_depth = rep_data->initiator_depth;
1766         event->param.conn.flow_control = rep_data->flow_control;
1767         event->param.conn.rnr_retry_count = rep_data->rnr_retry_count;
1768         event->param.conn.srq = rep_data->srq;
1769         event->param.conn.qp_num = rep_data->remote_qpn;
1770 }
1771
1772 static int cma_ib_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
1773 {
1774         struct rdma_id_private *id_priv = cm_id->context;
1775         struct rdma_cm_event event;
1776         int ret = 0;
1777
1778         mutex_lock(&id_priv->handler_mutex);
1779         if ((ib_event->event != IB_CM_TIMEWAIT_EXIT &&
1780              id_priv->state != RDMA_CM_CONNECT) ||
1781             (ib_event->event == IB_CM_TIMEWAIT_EXIT &&
1782              id_priv->state != RDMA_CM_DISCONNECT))
1783                 goto out;
1784
1785         memset(&event, 0, sizeof event);
1786         switch (ib_event->event) {
1787         case IB_CM_REQ_ERROR:
1788         case IB_CM_REP_ERROR:
1789                 event.event = RDMA_CM_EVENT_UNREACHABLE;
1790                 event.status = -ETIMEDOUT;
1791                 break;
1792         case IB_CM_REP_RECEIVED:
1793                 if (cma_comp(id_priv, RDMA_CM_CONNECT) &&
1794                     (id_priv->id.qp_type != IB_QPT_UD))
1795                         ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
1796                 if (id_priv->id.qp) {
1797                         event.status = cma_rep_recv(id_priv);
1798                         event.event = event.status ? RDMA_CM_EVENT_CONNECT_ERROR :
1799                                                      RDMA_CM_EVENT_ESTABLISHED;
1800                 } else {
1801                         event.event = RDMA_CM_EVENT_CONNECT_RESPONSE;
1802                 }
1803                 cma_set_rep_event_data(&event, &ib_event->param.rep_rcvd,
1804                                        ib_event->private_data);
1805                 break;
1806         case IB_CM_RTU_RECEIVED:
1807         case IB_CM_USER_ESTABLISHED:
1808                 event.event = RDMA_CM_EVENT_ESTABLISHED;
1809                 break;
1810         case IB_CM_DREQ_ERROR:
1811                 event.status = -ETIMEDOUT; /* fall through */
1812         case IB_CM_DREQ_RECEIVED:
1813         case IB_CM_DREP_RECEIVED:
1814                 if (!cma_comp_exch(id_priv, RDMA_CM_CONNECT,
1815                                    RDMA_CM_DISCONNECT))
1816                         goto out;
1817                 event.event = RDMA_CM_EVENT_DISCONNECTED;
1818                 break;
1819         case IB_CM_TIMEWAIT_EXIT:
1820                 event.event = RDMA_CM_EVENT_TIMEWAIT_EXIT;
1821                 break;
1822         case IB_CM_MRA_RECEIVED:
1823                 /* ignore event */
1824                 goto out;
1825         case IB_CM_REJ_RECEIVED:
1826                 pr_debug_ratelimited("RDMA CM: REJECTED: %s\n", rdma_reject_msg(&id_priv->id,
1827                                                                                 ib_event->param.rej_rcvd.reason));
1828                 cma_modify_qp_err(id_priv);
1829                 event.status = ib_event->param.rej_rcvd.reason;
1830                 event.event = RDMA_CM_EVENT_REJECTED;
1831                 event.param.conn.private_data = ib_event->private_data;
1832                 event.param.conn.private_data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
1833                 break;
1834         default:
1835                 pr_err("RDMA CMA: unexpected IB CM event: %d\n",
1836                        ib_event->event);
1837                 goto out;
1838         }
1839
1840         ret = id_priv->id.event_handler(&id_priv->id, &event);
1841         if (ret) {
1842                 /* Destroy the CM ID by returning a non-zero value. */
1843                 id_priv->cm_id.ib = NULL;
1844                 cma_exch(id_priv, RDMA_CM_DESTROYING);
1845                 mutex_unlock(&id_priv->handler_mutex);
1846                 rdma_destroy_id(&id_priv->id);
1847                 return ret;
1848         }
1849 out:
1850         mutex_unlock(&id_priv->handler_mutex);
1851         return ret;
1852 }
1853
1854 static struct rdma_id_private *cma_new_conn_id(struct rdma_cm_id *listen_id,
1855                                                struct ib_cm_event *ib_event,
1856                                                struct net_device *net_dev)
1857 {
1858         struct rdma_id_private *id_priv;
1859         struct rdma_cm_id *id;
1860         struct rdma_route *rt;
1861         const sa_family_t ss_family = listen_id->route.addr.src_addr.ss_family;
1862         struct sa_path_rec *path = ib_event->param.req_rcvd.primary_path;
1863         const __be64 service_id =
1864                 ib_event->param.req_rcvd.primary_path->service_id;
1865         int ret;
1866
1867         id = rdma_create_id(listen_id->route.addr.dev_addr.net,
1868                             listen_id->event_handler, listen_id->context,
1869                             listen_id->ps, ib_event->param.req_rcvd.qp_type);
1870         if (IS_ERR(id))
1871                 return NULL;
1872
1873         id_priv = container_of(id, struct rdma_id_private, id);
1874         if (cma_save_net_info((struct sockaddr *)&id->route.addr.src_addr,
1875                               (struct sockaddr *)&id->route.addr.dst_addr,
1876                               listen_id, ib_event, ss_family, service_id))
1877                 goto err;
1878
1879         rt = &id->route;
1880         rt->num_paths = ib_event->param.req_rcvd.alternate_path ? 2 : 1;
1881         rt->path_rec = kmalloc(sizeof *rt->path_rec * rt->num_paths,
1882                                GFP_KERNEL);
1883         if (!rt->path_rec)
1884                 goto err;
1885
1886         rt->path_rec[0] = *path;
1887         if (rt->num_paths == 2)
1888                 rt->path_rec[1] = *ib_event->param.req_rcvd.alternate_path;
1889
1890         if (net_dev) {
1891                 ret = rdma_copy_addr(&rt->addr.dev_addr, net_dev, NULL);
1892                 if (ret)
1893                         goto err;
1894         } else {
1895                 if (!cma_protocol_roce(listen_id) &&
1896                     cma_any_addr(cma_src_addr(id_priv))) {
1897                         rt->addr.dev_addr.dev_type = ARPHRD_INFINIBAND;
1898                         rdma_addr_set_sgid(&rt->addr.dev_addr, &rt->path_rec[0].sgid);
1899                         ib_addr_set_pkey(&rt->addr.dev_addr, be16_to_cpu(rt->path_rec[0].pkey));
1900                 } else if (!cma_any_addr(cma_src_addr(id_priv))) {
1901                         ret = cma_translate_addr(cma_src_addr(id_priv), &rt->addr.dev_addr);
1902                         if (ret)
1903                                 goto err;
1904                 }
1905         }
1906         rdma_addr_set_dgid(&rt->addr.dev_addr, &rt->path_rec[0].dgid);
1907
1908         id_priv->state = RDMA_CM_CONNECT;
1909         return id_priv;
1910
1911 err:
1912         rdma_destroy_id(id);
1913         return NULL;
1914 }
1915
1916 static struct rdma_id_private *cma_new_udp_id(struct rdma_cm_id *listen_id,
1917                                               struct ib_cm_event *ib_event,
1918                                               struct net_device *net_dev)
1919 {
1920         struct rdma_id_private *id_priv;
1921         struct rdma_cm_id *id;
1922         const sa_family_t ss_family = listen_id->route.addr.src_addr.ss_family;
1923         struct net *net = listen_id->route.addr.dev_addr.net;
1924         int ret;
1925
1926         id = rdma_create_id(net, listen_id->event_handler, listen_id->context,
1927                             listen_id->ps, IB_QPT_UD);
1928         if (IS_ERR(id))
1929                 return NULL;
1930
1931         id_priv = container_of(id, struct rdma_id_private, id);
1932         if (cma_save_net_info((struct sockaddr *)&id->route.addr.src_addr,
1933                               (struct sockaddr *)&id->route.addr.dst_addr,
1934                               listen_id, ib_event, ss_family,
1935                               ib_event->param.sidr_req_rcvd.service_id))
1936                 goto err;
1937
1938         if (net_dev) {
1939                 ret = rdma_copy_addr(&id->route.addr.dev_addr, net_dev, NULL);
1940                 if (ret)
1941                         goto err;
1942         } else {
1943                 if (!cma_any_addr(cma_src_addr(id_priv))) {
1944                         ret = cma_translate_addr(cma_src_addr(id_priv),
1945                                                  &id->route.addr.dev_addr);
1946                         if (ret)
1947                                 goto err;
1948                 }
1949         }
1950
1951         id_priv->state = RDMA_CM_CONNECT;
1952         return id_priv;
1953 err:
1954         rdma_destroy_id(id);
1955         return NULL;
1956 }
1957
1958 static void cma_set_req_event_data(struct rdma_cm_event *event,
1959                                    struct ib_cm_req_event_param *req_data,
1960                                    void *private_data, int offset)
1961 {
1962         event->param.conn.private_data = private_data + offset;
1963         event->param.conn.private_data_len = IB_CM_REQ_PRIVATE_DATA_SIZE - offset;
1964         event->param.conn.responder_resources = req_data->responder_resources;
1965         event->param.conn.initiator_depth = req_data->initiator_depth;
1966         event->param.conn.flow_control = req_data->flow_control;
1967         event->param.conn.retry_count = req_data->retry_count;
1968         event->param.conn.rnr_retry_count = req_data->rnr_retry_count;
1969         event->param.conn.srq = req_data->srq;
1970         event->param.conn.qp_num = req_data->remote_qpn;
1971 }
1972
1973 static int cma_check_req_qp_type(struct rdma_cm_id *id, struct ib_cm_event *ib_event)
1974 {
1975         return (((ib_event->event == IB_CM_REQ_RECEIVED) &&
1976                  (ib_event->param.req_rcvd.qp_type == id->qp_type)) ||
1977                 ((ib_event->event == IB_CM_SIDR_REQ_RECEIVED) &&
1978                  (id->qp_type == IB_QPT_UD)) ||
1979                 (!id->qp_type));
1980 }
1981
1982 static int cma_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
1983 {
1984         struct rdma_id_private *listen_id, *conn_id = NULL;
1985         struct rdma_cm_event event;
1986         struct net_device *net_dev;
1987         u8 offset;
1988         int ret;
1989
1990         listen_id = cma_id_from_event(cm_id, ib_event, &net_dev);
1991         if (IS_ERR(listen_id))
1992                 return PTR_ERR(listen_id);
1993
1994         if (!cma_check_req_qp_type(&listen_id->id, ib_event)) {
1995                 ret = -EINVAL;
1996                 goto net_dev_put;
1997         }
1998
1999         mutex_lock(&listen_id->handler_mutex);
2000         if (listen_id->state != RDMA_CM_LISTEN) {
2001                 ret = -ECONNABORTED;
2002                 goto err1;
2003         }
2004
2005         memset(&event, 0, sizeof event);
2006         offset = cma_user_data_offset(listen_id);
2007         event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
2008         if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED) {
2009                 conn_id = cma_new_udp_id(&listen_id->id, ib_event, net_dev);
2010                 event.param.ud.private_data = ib_event->private_data + offset;
2011                 event.param.ud.private_data_len =
2012                                 IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE - offset;
2013         } else {
2014                 conn_id = cma_new_conn_id(&listen_id->id, ib_event, net_dev);
2015                 cma_set_req_event_data(&event, &ib_event->param.req_rcvd,
2016                                        ib_event->private_data, offset);
2017         }
2018         if (!conn_id) {
2019                 ret = -ENOMEM;
2020                 goto err1;
2021         }
2022
2023         mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
2024         ret = cma_acquire_dev(conn_id, listen_id);
2025         if (ret)
2026                 goto err2;
2027
2028         conn_id->cm_id.ib = cm_id;
2029         cm_id->context = conn_id;
2030         cm_id->cm_handler = cma_ib_handler;
2031
2032         /*
2033          * Protect against the user destroying conn_id from another thread
2034          * until we're done accessing it.
2035          */
2036         atomic_inc(&conn_id->refcount);
2037         ret = conn_id->id.event_handler(&conn_id->id, &event);
2038         if (ret)
2039                 goto err3;
2040         /*
2041          * Acquire mutex to prevent user executing rdma_destroy_id()
2042          * while we're accessing the cm_id.
2043          */
2044         mutex_lock(&lock);
2045         if (cma_comp(conn_id, RDMA_CM_CONNECT) &&
2046             (conn_id->id.qp_type != IB_QPT_UD))
2047                 ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
2048         mutex_unlock(&lock);
2049         mutex_unlock(&conn_id->handler_mutex);
2050         mutex_unlock(&listen_id->handler_mutex);
2051         cma_deref_id(conn_id);
2052         if (net_dev)
2053                 dev_put(net_dev);
2054         return 0;
2055
2056 err3:
2057         cma_deref_id(conn_id);
2058         /* Destroy the CM ID by returning a non-zero value. */
2059         conn_id->cm_id.ib = NULL;
2060 err2:
2061         cma_exch(conn_id, RDMA_CM_DESTROYING);
2062         mutex_unlock(&conn_id->handler_mutex);
2063 err1:
2064         mutex_unlock(&listen_id->handler_mutex);
2065         if (conn_id)
2066                 rdma_destroy_id(&conn_id->id);
2067
2068 net_dev_put:
2069         if (net_dev)
2070                 dev_put(net_dev);
2071
2072         return ret;
2073 }
2074
2075 __be64 rdma_get_service_id(struct rdma_cm_id *id, struct sockaddr *addr)
2076 {
2077         if (addr->sa_family == AF_IB)
2078                 return ((struct sockaddr_ib *) addr)->sib_sid;
2079
2080         return cpu_to_be64(((u64)id->ps << 16) + be16_to_cpu(cma_port(addr)));
2081 }
2082 EXPORT_SYMBOL(rdma_get_service_id);
2083
2084 static int cma_iw_handler(struct iw_cm_id *iw_id, struct iw_cm_event *iw_event)
2085 {
2086         struct rdma_id_private *id_priv = iw_id->context;
2087         struct rdma_cm_event event;
2088         int ret = 0;
2089         struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr;
2090         struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr;
2091
2092         mutex_lock(&id_priv->handler_mutex);
2093         if (id_priv->state != RDMA_CM_CONNECT)
2094                 goto out;
2095
2096         memset(&event, 0, sizeof event);
2097         switch (iw_event->event) {
2098         case IW_CM_EVENT_CLOSE:
2099                 event.event = RDMA_CM_EVENT_DISCONNECTED;
2100                 break;
2101         case IW_CM_EVENT_CONNECT_REPLY:
2102                 memcpy(cma_src_addr(id_priv), laddr,
2103                        rdma_addr_size(laddr));
2104                 memcpy(cma_dst_addr(id_priv), raddr,
2105                        rdma_addr_size(raddr));
2106                 switch (iw_event->status) {
2107                 case 0:
2108                         event.event = RDMA_CM_EVENT_ESTABLISHED;
2109                         event.param.conn.initiator_depth = iw_event->ird;
2110                         event.param.conn.responder_resources = iw_event->ord;
2111                         break;
2112                 case -ECONNRESET:
2113                 case -ECONNREFUSED:
2114                         event.event = RDMA_CM_EVENT_REJECTED;
2115                         break;
2116                 case -ETIMEDOUT:
2117                         event.event = RDMA_CM_EVENT_UNREACHABLE;
2118                         break;
2119                 default:
2120                         event.event = RDMA_CM_EVENT_CONNECT_ERROR;
2121                         break;
2122                 }
2123                 break;
2124         case IW_CM_EVENT_ESTABLISHED:
2125                 event.event = RDMA_CM_EVENT_ESTABLISHED;
2126                 event.param.conn.initiator_depth = iw_event->ird;
2127                 event.param.conn.responder_resources = iw_event->ord;
2128                 break;
2129         default:
2130                 BUG_ON(1);
2131         }
2132
2133         event.status = iw_event->status;
2134         event.param.conn.private_data = iw_event->private_data;
2135         event.param.conn.private_data_len = iw_event->private_data_len;
2136         ret = id_priv->id.event_handler(&id_priv->id, &event);
2137         if (ret) {
2138                 /* Destroy the CM ID by returning a non-zero value. */
2139                 id_priv->cm_id.iw = NULL;
2140                 cma_exch(id_priv, RDMA_CM_DESTROYING);
2141                 mutex_unlock(&id_priv->handler_mutex);
2142                 rdma_destroy_id(&id_priv->id);
2143                 return ret;
2144         }
2145
2146 out:
2147         mutex_unlock(&id_priv->handler_mutex);
2148         return ret;
2149 }
2150
2151 static int iw_conn_req_handler(struct iw_cm_id *cm_id,
2152                                struct iw_cm_event *iw_event)
2153 {
2154         struct rdma_cm_id *new_cm_id;
2155         struct rdma_id_private *listen_id, *conn_id;
2156         struct rdma_cm_event event;
2157         int ret = -ECONNABORTED;
2158         struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr;
2159         struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr;
2160
2161         listen_id = cm_id->context;
2162
2163         mutex_lock(&listen_id->handler_mutex);
2164         if (listen_id->state != RDMA_CM_LISTEN)
2165                 goto out;
2166
2167         /* Create a new RDMA id for the new IW CM ID */
2168         new_cm_id = rdma_create_id(listen_id->id.route.addr.dev_addr.net,
2169                                    listen_id->id.event_handler,
2170                                    listen_id->id.context,
2171                                    RDMA_PS_TCP, IB_QPT_RC);
2172         if (IS_ERR(new_cm_id)) {
2173                 ret = -ENOMEM;
2174                 goto out;
2175         }
2176         conn_id = container_of(new_cm_id, struct rdma_id_private, id);
2177         mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
2178         conn_id->state = RDMA_CM_CONNECT;
2179
2180         ret = rdma_translate_ip(laddr, &conn_id->id.route.addr.dev_addr, NULL);
2181         if (ret) {
2182                 mutex_unlock(&conn_id->handler_mutex);
2183                 rdma_destroy_id(new_cm_id);
2184                 goto out;
2185         }
2186
2187         ret = cma_acquire_dev(conn_id, listen_id);
2188         if (ret) {
2189                 mutex_unlock(&conn_id->handler_mutex);
2190                 rdma_destroy_id(new_cm_id);
2191                 goto out;
2192         }
2193
2194         conn_id->cm_id.iw = cm_id;
2195         cm_id->context = conn_id;
2196         cm_id->cm_handler = cma_iw_handler;
2197
2198         memcpy(cma_src_addr(conn_id), laddr, rdma_addr_size(laddr));
2199         memcpy(cma_dst_addr(conn_id), raddr, rdma_addr_size(raddr));
2200
2201         memset(&event, 0, sizeof event);
2202         event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
2203         event.param.conn.private_data = iw_event->private_data;
2204         event.param.conn.private_data_len = iw_event->private_data_len;
2205         event.param.conn.initiator_depth = iw_event->ird;
2206         event.param.conn.responder_resources = iw_event->ord;
2207
2208         /*
2209          * Protect against the user destroying conn_id from another thread
2210          * until we're done accessing it.
2211          */
2212         atomic_inc(&conn_id->refcount);
2213         ret = conn_id->id.event_handler(&conn_id->id, &event);
2214         if (ret) {
2215                 /* User wants to destroy the CM ID */
2216                 conn_id->cm_id.iw = NULL;
2217                 cma_exch(conn_id, RDMA_CM_DESTROYING);
2218                 mutex_unlock(&conn_id->handler_mutex);
2219                 mutex_unlock(&listen_id->handler_mutex);
2220                 cma_deref_id(conn_id);
2221                 rdma_destroy_id(&conn_id->id);
2222                 return ret;
2223         }
2224
2225         mutex_unlock(&conn_id->handler_mutex);
2226         cma_deref_id(conn_id);
2227
2228 out:
2229         mutex_unlock(&listen_id->handler_mutex);
2230         return ret;
2231 }
2232
2233 static int cma_ib_listen(struct rdma_id_private *id_priv)
2234 {
2235         struct sockaddr *addr;
2236         struct ib_cm_id *id;
2237         __be64 svc_id;
2238
2239         addr = cma_src_addr(id_priv);
2240         svc_id = rdma_get_service_id(&id_priv->id, addr);
2241         id = ib_cm_insert_listen(id_priv->id.device, cma_req_handler, svc_id);
2242         if (IS_ERR(id))
2243                 return PTR_ERR(id);
2244         id_priv->cm_id.ib = id;
2245
2246         return 0;
2247 }
2248
2249 static int cma_iw_listen(struct rdma_id_private *id_priv, int backlog)
2250 {
2251         int ret;
2252         struct iw_cm_id *id;
2253
2254         id = iw_create_cm_id(id_priv->id.device,
2255                              iw_conn_req_handler,
2256                              id_priv);
2257         if (IS_ERR(id))
2258                 return PTR_ERR(id);
2259
2260         id->tos = id_priv->tos;
2261         id_priv->cm_id.iw = id;
2262
2263         memcpy(&id_priv->cm_id.iw->local_addr, cma_src_addr(id_priv),
2264                rdma_addr_size(cma_src_addr(id_priv)));
2265
2266         ret = iw_cm_listen(id_priv->cm_id.iw, backlog);
2267
2268         if (ret) {
2269                 iw_destroy_cm_id(id_priv->cm_id.iw);
2270                 id_priv->cm_id.iw = NULL;
2271         }
2272
2273         return ret;
2274 }
2275
2276 static int cma_listen_handler(struct rdma_cm_id *id,
2277                               struct rdma_cm_event *event)
2278 {
2279         struct rdma_id_private *id_priv = id->context;
2280
2281         id->context = id_priv->id.context;
2282         id->event_handler = id_priv->id.event_handler;
2283         return id_priv->id.event_handler(id, event);
2284 }
2285
2286 static void cma_listen_on_dev(struct rdma_id_private *id_priv,
2287                               struct cma_device *cma_dev)
2288 {
2289         struct rdma_id_private *dev_id_priv;
2290         struct rdma_cm_id *id;
2291         struct net *net = id_priv->id.route.addr.dev_addr.net;
2292         int ret;
2293
2294         lockdep_assert_held(&lock);
2295
2296         if (cma_family(id_priv) == AF_IB && !rdma_cap_ib_cm(cma_dev->device, 1))
2297                 return;
2298
2299         id = rdma_create_id(net, cma_listen_handler, id_priv, id_priv->id.ps,
2300                             id_priv->id.qp_type);
2301         if (IS_ERR(id))
2302                 return;
2303
2304         dev_id_priv = container_of(id, struct rdma_id_private, id);
2305
2306         dev_id_priv->state = RDMA_CM_ADDR_BOUND;
2307         memcpy(cma_src_addr(dev_id_priv), cma_src_addr(id_priv),
2308                rdma_addr_size(cma_src_addr(id_priv)));
2309
2310         _cma_attach_to_dev(dev_id_priv, cma_dev);
2311         list_add_tail(&dev_id_priv->listen_list, &id_priv->listen_list);
2312         atomic_inc(&id_priv->refcount);
2313         dev_id_priv->internal_id = 1;
2314         dev_id_priv->afonly = id_priv->afonly;
2315
2316         ret = rdma_listen(id, id_priv->backlog);
2317         if (ret)
2318                 pr_warn("RDMA CMA: cma_listen_on_dev, error %d, listening on device %s\n",
2319                         ret, cma_dev->device->name);
2320 }
2321
2322 static void cma_listen_on_all(struct rdma_id_private *id_priv)
2323 {
2324         struct cma_device *cma_dev;
2325
2326         mutex_lock(&lock);
2327         list_add_tail(&id_priv->list, &listen_any_list);
2328         list_for_each_entry(cma_dev, &dev_list, list)
2329                 cma_listen_on_dev(id_priv, cma_dev);
2330         mutex_unlock(&lock);
2331 }
2332
2333 void rdma_set_service_type(struct rdma_cm_id *id, int tos)
2334 {
2335         struct rdma_id_private *id_priv;
2336
2337         id_priv = container_of(id, struct rdma_id_private, id);
2338         id_priv->tos = (u8) tos;
2339         id_priv->tos_set = true;
2340 }
2341 EXPORT_SYMBOL(rdma_set_service_type);
2342
2343 static void cma_query_handler(int status, struct sa_path_rec *path_rec,
2344                               void *context)
2345 {
2346         struct cma_work *work = context;
2347         struct rdma_route *route;
2348
2349         route = &work->id->id.route;
2350
2351         if (!status) {
2352                 route->num_paths = 1;
2353                 *route->path_rec = *path_rec;
2354         } else {
2355                 work->old_state = RDMA_CM_ROUTE_QUERY;
2356                 work->new_state = RDMA_CM_ADDR_RESOLVED;
2357                 work->event.event = RDMA_CM_EVENT_ROUTE_ERROR;
2358                 work->event.status = status;
2359                 pr_debug_ratelimited("RDMA CM: ROUTE_ERROR: failed to query path. status %d\n",
2360                                      status);
2361         }
2362
2363         queue_work(cma_wq, &work->work);
2364 }
2365
2366 static int cma_query_ib_route(struct rdma_id_private *id_priv, int timeout_ms,
2367                               struct cma_work *work)
2368 {
2369         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
2370         struct sa_path_rec path_rec;
2371         ib_sa_comp_mask comp_mask;
2372         struct sockaddr_in6 *sin6;
2373         struct sockaddr_ib *sib;
2374
2375         memset(&path_rec, 0, sizeof path_rec);
2376
2377         if (rdma_cap_opa_ah(id_priv->id.device, id_priv->id.port_num))
2378                 path_rec.rec_type = SA_PATH_REC_TYPE_OPA;
2379         else
2380                 path_rec.rec_type = SA_PATH_REC_TYPE_IB;
2381         rdma_addr_get_sgid(dev_addr, &path_rec.sgid);
2382         rdma_addr_get_dgid(dev_addr, &path_rec.dgid);
2383         path_rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
2384         path_rec.numb_path = 1;
2385         path_rec.reversible = 1;
2386         path_rec.service_id = rdma_get_service_id(&id_priv->id,
2387                                                   cma_dst_addr(id_priv));
2388
2389         comp_mask = IB_SA_PATH_REC_DGID | IB_SA_PATH_REC_SGID |
2390                     IB_SA_PATH_REC_PKEY | IB_SA_PATH_REC_NUMB_PATH |
2391                     IB_SA_PATH_REC_REVERSIBLE | IB_SA_PATH_REC_SERVICE_ID;
2392
2393         switch (cma_family(id_priv)) {
2394         case AF_INET:
2395                 path_rec.qos_class = cpu_to_be16((u16) id_priv->tos);
2396                 comp_mask |= IB_SA_PATH_REC_QOS_CLASS;
2397                 break;
2398         case AF_INET6:
2399                 sin6 = (struct sockaddr_in6 *) cma_src_addr(id_priv);
2400                 path_rec.traffic_class = (u8) (be32_to_cpu(sin6->sin6_flowinfo) >> 20);
2401                 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
2402                 break;
2403         case AF_IB:
2404                 sib = (struct sockaddr_ib *) cma_src_addr(id_priv);
2405                 path_rec.traffic_class = (u8) (be32_to_cpu(sib->sib_flowinfo) >> 20);
2406                 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
2407                 break;
2408         }
2409
2410         id_priv->query_id = ib_sa_path_rec_get(&sa_client, id_priv->id.device,
2411                                                id_priv->id.port_num, &path_rec,
2412                                                comp_mask, timeout_ms,
2413                                                GFP_KERNEL, cma_query_handler,
2414                                                work, &id_priv->query);
2415
2416         return (id_priv->query_id < 0) ? id_priv->query_id : 0;
2417 }
2418
2419 static void cma_work_handler(struct work_struct *_work)
2420 {
2421         struct cma_work *work = container_of(_work, struct cma_work, work);
2422         struct rdma_id_private *id_priv = work->id;
2423         int destroy = 0;
2424
2425         mutex_lock(&id_priv->handler_mutex);
2426         if (!cma_comp_exch(id_priv, work->old_state, work->new_state))
2427                 goto out;
2428
2429         if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
2430                 cma_exch(id_priv, RDMA_CM_DESTROYING);
2431                 destroy = 1;
2432         }
2433 out:
2434         mutex_unlock(&id_priv->handler_mutex);
2435         cma_deref_id(id_priv);
2436         if (destroy)
2437                 rdma_destroy_id(&id_priv->id);
2438         kfree(work);
2439 }
2440
2441 static void cma_ndev_work_handler(struct work_struct *_work)
2442 {
2443         struct cma_ndev_work *work = container_of(_work, struct cma_ndev_work, work);
2444         struct rdma_id_private *id_priv = work->id;
2445         int destroy = 0;
2446
2447         mutex_lock(&id_priv->handler_mutex);
2448         if (id_priv->state == RDMA_CM_DESTROYING ||
2449             id_priv->state == RDMA_CM_DEVICE_REMOVAL)
2450                 goto out;
2451
2452         if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
2453                 cma_exch(id_priv, RDMA_CM_DESTROYING);
2454                 destroy = 1;
2455         }
2456
2457 out:
2458         mutex_unlock(&id_priv->handler_mutex);
2459         cma_deref_id(id_priv);
2460         if (destroy)
2461                 rdma_destroy_id(&id_priv->id);
2462         kfree(work);
2463 }
2464
2465 static int cma_resolve_ib_route(struct rdma_id_private *id_priv, int timeout_ms)
2466 {
2467         struct rdma_route *route = &id_priv->id.route;
2468         struct cma_work *work;
2469         int ret;
2470
2471         work = kzalloc(sizeof *work, GFP_KERNEL);
2472         if (!work)
2473                 return -ENOMEM;
2474
2475         work->id = id_priv;
2476         INIT_WORK(&work->work, cma_work_handler);
2477         work->old_state = RDMA_CM_ROUTE_QUERY;
2478         work->new_state = RDMA_CM_ROUTE_RESOLVED;
2479         work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
2480
2481         if (!route->path_rec)
2482                 route->path_rec = kmalloc(sizeof *route->path_rec, GFP_KERNEL);
2483         if (!route->path_rec) {
2484                 ret = -ENOMEM;
2485                 goto err1;
2486         }
2487
2488         ret = cma_query_ib_route(id_priv, timeout_ms, work);
2489         if (ret)
2490                 goto err2;
2491
2492         return 0;
2493 err2:
2494         kfree(route->path_rec);
2495         route->path_rec = NULL;
2496 err1:
2497         kfree(work);
2498         return ret;
2499 }
2500
2501 int rdma_set_ib_paths(struct rdma_cm_id *id,
2502                       struct sa_path_rec *path_rec, int num_paths)
2503 {
2504         struct rdma_id_private *id_priv;
2505         int ret;
2506
2507         id_priv = container_of(id, struct rdma_id_private, id);
2508         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
2509                            RDMA_CM_ROUTE_RESOLVED))
2510                 return -EINVAL;
2511
2512         id->route.path_rec = kmemdup(path_rec, sizeof *path_rec * num_paths,
2513                                      GFP_KERNEL);
2514         if (!id->route.path_rec) {
2515                 ret = -ENOMEM;
2516                 goto err;
2517         }
2518
2519         id->route.num_paths = num_paths;
2520         return 0;
2521 err:
2522         cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_ADDR_RESOLVED);
2523         return ret;
2524 }
2525 EXPORT_SYMBOL(rdma_set_ib_paths);
2526
2527 static int cma_resolve_iw_route(struct rdma_id_private *id_priv, int timeout_ms)
2528 {
2529         struct cma_work *work;
2530
2531         work = kzalloc(sizeof *work, GFP_KERNEL);
2532         if (!work)
2533                 return -ENOMEM;
2534
2535         work->id = id_priv;
2536         INIT_WORK(&work->work, cma_work_handler);
2537         work->old_state = RDMA_CM_ROUTE_QUERY;
2538         work->new_state = RDMA_CM_ROUTE_RESOLVED;
2539         work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
2540         queue_work(cma_wq, &work->work);
2541         return 0;
2542 }
2543
2544 static int iboe_tos_to_sl(struct net_device *ndev, int tos)
2545 {
2546         int prio;
2547         struct net_device *dev;
2548
2549         prio = rt_tos2priority(tos);
2550         dev = is_vlan_dev(ndev) ? vlan_dev_real_dev(ndev) : ndev;
2551         if (dev->num_tc)
2552                 return netdev_get_prio_tc_map(dev, prio);
2553
2554 #if IS_ENABLED(CONFIG_VLAN_8021Q)
2555         if (is_vlan_dev(ndev))
2556                 return (vlan_dev_get_egress_qos_mask(ndev, prio) &
2557                         VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
2558 #endif
2559         return 0;
2560 }
2561
2562 static enum ib_gid_type cma_route_gid_type(enum rdma_network_type network_type,
2563                                            unsigned long supported_gids,
2564                                            enum ib_gid_type default_gid)
2565 {
2566         if ((network_type == RDMA_NETWORK_IPV4 ||
2567              network_type == RDMA_NETWORK_IPV6) &&
2568             test_bit(IB_GID_TYPE_ROCE_UDP_ENCAP, &supported_gids))
2569                 return IB_GID_TYPE_ROCE_UDP_ENCAP;
2570
2571         return default_gid;
2572 }
2573
2574 static int cma_resolve_iboe_route(struct rdma_id_private *id_priv)
2575 {
2576         struct rdma_route *route = &id_priv->id.route;
2577         struct rdma_addr *addr = &route->addr;
2578         struct cma_work *work;
2579         int ret;
2580         struct net_device *ndev = NULL;
2581         enum ib_gid_type gid_type = IB_GID_TYPE_IB;
2582         u8 default_roce_tos = id_priv->cma_dev->default_roce_tos[id_priv->id.port_num -
2583                                         rdma_start_port(id_priv->cma_dev->device)];
2584         u8 tos = id_priv->tos_set ? id_priv->tos : default_roce_tos;
2585
2586
2587         work = kzalloc(sizeof *work, GFP_KERNEL);
2588         if (!work)
2589                 return -ENOMEM;
2590
2591         work->id = id_priv;
2592         INIT_WORK(&work->work, cma_work_handler);
2593
2594         route->path_rec = kzalloc(sizeof *route->path_rec, GFP_KERNEL);
2595         if (!route->path_rec) {
2596                 ret = -ENOMEM;
2597                 goto err1;
2598         }
2599
2600         route->num_paths = 1;
2601
2602         if (addr->dev_addr.bound_dev_if) {
2603                 unsigned long supported_gids;
2604
2605                 ndev = dev_get_by_index(&init_net, addr->dev_addr.bound_dev_if);
2606                 if (!ndev) {
2607                         ret = -ENODEV;
2608                         goto err2;
2609                 }
2610
2611                 supported_gids = roce_gid_type_mask_support(id_priv->id.device,
2612                                                             id_priv->id.port_num);
2613                 gid_type = cma_route_gid_type(addr->dev_addr.network,
2614                                               supported_gids,
2615                                               id_priv->gid_type);
2616                 route->path_rec->rec_type =
2617                         sa_conv_gid_to_pathrec_type(gid_type);
2618                 sa_path_set_ndev(route->path_rec, &init_net);
2619                 sa_path_set_ifindex(route->path_rec, ndev->ifindex);
2620         }
2621         if (!ndev) {
2622                 ret = -ENODEV;
2623                 goto err2;
2624         }
2625
2626         sa_path_set_dmac(route->path_rec, addr->dev_addr.dst_dev_addr);
2627
2628         rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
2629                     &route->path_rec->sgid);
2630         rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.dst_addr,
2631                     &route->path_rec->dgid);
2632
2633         /* Use the hint from IP Stack to select GID Type */
2634         if (gid_type < ib_network_to_gid_type(addr->dev_addr.network))
2635                 gid_type = ib_network_to_gid_type(addr->dev_addr.network);
2636         route->path_rec->rec_type = sa_conv_gid_to_pathrec_type(gid_type);
2637
2638         if (((struct sockaddr *)&id_priv->id.route.addr.dst_addr)->sa_family != AF_IB)
2639                 /* TODO: get the hoplimit from the inet/inet6 device */
2640                 route->path_rec->hop_limit = addr->dev_addr.hoplimit;
2641         else
2642                 route->path_rec->hop_limit = 1;
2643         route->path_rec->reversible = 1;
2644         route->path_rec->pkey = cpu_to_be16(0xffff);
2645         route->path_rec->mtu_selector = IB_SA_EQ;
2646         route->path_rec->sl = iboe_tos_to_sl(ndev, tos);
2647         route->path_rec->traffic_class = tos;
2648         route->path_rec->mtu = iboe_get_mtu(ndev->mtu);
2649         route->path_rec->rate_selector = IB_SA_EQ;
2650         route->path_rec->rate = iboe_get_rate(ndev);
2651         dev_put(ndev);
2652         route->path_rec->packet_life_time_selector = IB_SA_EQ;
2653         route->path_rec->packet_life_time = CMA_IBOE_PACKET_LIFETIME;
2654         if (!route->path_rec->mtu) {
2655                 ret = -EINVAL;
2656                 goto err2;
2657         }
2658
2659         work->old_state = RDMA_CM_ROUTE_QUERY;
2660         work->new_state = RDMA_CM_ROUTE_RESOLVED;
2661         work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
2662         work->event.status = 0;
2663
2664         queue_work(cma_wq, &work->work);
2665
2666         return 0;
2667
2668 err2:
2669         kfree(route->path_rec);
2670         route->path_rec = NULL;
2671         route->num_paths = 0;
2672 err1:
2673         kfree(work);
2674         return ret;
2675 }
2676
2677 int rdma_resolve_route(struct rdma_cm_id *id, int timeout_ms)
2678 {
2679         struct rdma_id_private *id_priv;
2680         int ret;
2681
2682         id_priv = container_of(id, struct rdma_id_private, id);
2683         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED, RDMA_CM_ROUTE_QUERY))
2684                 return -EINVAL;
2685
2686         atomic_inc(&id_priv->refcount);
2687         if (rdma_cap_ib_sa(id->device, id->port_num))
2688                 ret = cma_resolve_ib_route(id_priv, timeout_ms);
2689         else if (rdma_protocol_roce(id->device, id->port_num))
2690                 ret = cma_resolve_iboe_route(id_priv);
2691         else if (rdma_protocol_iwarp(id->device, id->port_num))
2692                 ret = cma_resolve_iw_route(id_priv, timeout_ms);
2693         else
2694                 ret = -ENOSYS;
2695
2696         if (ret)
2697                 goto err;
2698
2699         return 0;
2700 err:
2701         cma_comp_exch(id_priv, RDMA_CM_ROUTE_QUERY, RDMA_CM_ADDR_RESOLVED);
2702         cma_deref_id(id_priv);
2703         return ret;
2704 }
2705 EXPORT_SYMBOL(rdma_resolve_route);
2706
2707 static void cma_set_loopback(struct sockaddr *addr)
2708 {
2709         switch (addr->sa_family) {
2710         case AF_INET:
2711                 ((struct sockaddr_in *) addr)->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
2712                 break;
2713         case AF_INET6:
2714                 ipv6_addr_set(&((struct sockaddr_in6 *) addr)->sin6_addr,
2715                               0, 0, 0, htonl(1));
2716                 break;
2717         default:
2718                 ib_addr_set(&((struct sockaddr_ib *) addr)->sib_addr,
2719                             0, 0, 0, htonl(1));
2720                 break;
2721         }
2722 }
2723
2724 static int cma_bind_loopback(struct rdma_id_private *id_priv)
2725 {
2726         struct cma_device *cma_dev, *cur_dev;
2727         union ib_gid gid;
2728         enum ib_port_state port_state;
2729         u16 pkey;
2730         int ret;
2731         u8 p;
2732
2733         cma_dev = NULL;
2734         mutex_lock(&lock);
2735         list_for_each_entry(cur_dev, &dev_list, list) {
2736                 if (cma_family(id_priv) == AF_IB &&
2737                     !rdma_cap_ib_cm(cur_dev->device, 1))
2738                         continue;
2739
2740                 if (!cma_dev)
2741                         cma_dev = cur_dev;
2742
2743                 for (p = 1; p <= cur_dev->device->phys_port_cnt; ++p) {
2744                         if (!ib_get_cached_port_state(cur_dev->device, p, &port_state) &&
2745                             port_state == IB_PORT_ACTIVE) {
2746                                 cma_dev = cur_dev;
2747                                 goto port_found;
2748                         }
2749                 }
2750         }
2751
2752         if (!cma_dev) {
2753                 ret = -ENODEV;
2754                 goto out;
2755         }
2756
2757         p = 1;
2758
2759 port_found:
2760         ret = ib_get_cached_gid(cma_dev->device, p, 0, &gid, NULL);
2761         if (ret)
2762                 goto out;
2763
2764         ret = ib_get_cached_pkey(cma_dev->device, p, 0, &pkey);
2765         if (ret)
2766                 goto out;
2767
2768         id_priv->id.route.addr.dev_addr.dev_type =
2769                 (rdma_protocol_ib(cma_dev->device, p)) ?
2770                 ARPHRD_INFINIBAND : ARPHRD_ETHER;
2771
2772         rdma_addr_set_sgid(&id_priv->id.route.addr.dev_addr, &gid);
2773         ib_addr_set_pkey(&id_priv->id.route.addr.dev_addr, pkey);
2774         id_priv->id.port_num = p;
2775         cma_attach_to_dev(id_priv, cma_dev);
2776         cma_set_loopback(cma_src_addr(id_priv));
2777 out:
2778         mutex_unlock(&lock);
2779         return ret;
2780 }
2781
2782 static void addr_handler(int status, struct sockaddr *src_addr,
2783                          struct rdma_dev_addr *dev_addr, void *context)
2784 {
2785         struct rdma_id_private *id_priv = context;
2786         struct rdma_cm_event event;
2787
2788         memset(&event, 0, sizeof event);
2789         mutex_lock(&id_priv->handler_mutex);
2790         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY,
2791                            RDMA_CM_ADDR_RESOLVED))
2792                 goto out;
2793
2794         memcpy(cma_src_addr(id_priv), src_addr, rdma_addr_size(src_addr));
2795         if (!status && !id_priv->cma_dev) {
2796                 status = cma_acquire_dev(id_priv, NULL);
2797                 if (status)
2798                         pr_debug_ratelimited("RDMA CM: ADDR_ERROR: failed to acquire device. status %d\n",
2799                                              status);
2800         } else if (status) {
2801                 pr_debug_ratelimited("RDMA CM: ADDR_ERROR: failed to resolve IP. status %d\n", status);
2802         }
2803
2804         if (status) {
2805                 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
2806                                    RDMA_CM_ADDR_BOUND))
2807                         goto out;
2808                 event.event = RDMA_CM_EVENT_ADDR_ERROR;
2809                 event.status = status;
2810         } else
2811                 event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
2812
2813         if (id_priv->id.event_handler(&id_priv->id, &event)) {
2814                 cma_exch(id_priv, RDMA_CM_DESTROYING);
2815                 mutex_unlock(&id_priv->handler_mutex);
2816                 cma_deref_id(id_priv);
2817                 rdma_destroy_id(&id_priv->id);
2818                 return;
2819         }
2820 out:
2821         mutex_unlock(&id_priv->handler_mutex);
2822         cma_deref_id(id_priv);
2823 }
2824
2825 static int cma_resolve_loopback(struct rdma_id_private *id_priv)
2826 {
2827         struct cma_work *work;
2828         union ib_gid gid;
2829         int ret;
2830
2831         work = kzalloc(sizeof *work, GFP_KERNEL);
2832         if (!work)
2833                 return -ENOMEM;
2834
2835         if (!id_priv->cma_dev) {
2836                 ret = cma_bind_loopback(id_priv);
2837                 if (ret)
2838                         goto err;
2839         }
2840
2841         rdma_addr_get_sgid(&id_priv->id.route.addr.dev_addr, &gid);
2842         rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, &gid);
2843
2844         work->id = id_priv;
2845         INIT_WORK(&work->work, cma_work_handler);
2846         work->old_state = RDMA_CM_ADDR_QUERY;
2847         work->new_state = RDMA_CM_ADDR_RESOLVED;
2848         work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
2849         queue_work(cma_wq, &work->work);
2850         return 0;
2851 err:
2852         kfree(work);
2853         return ret;
2854 }
2855
2856 static int cma_resolve_ib_addr(struct rdma_id_private *id_priv)
2857 {
2858         struct cma_work *work;
2859         int ret;
2860
2861         work = kzalloc(sizeof *work, GFP_KERNEL);
2862         if (!work)
2863                 return -ENOMEM;
2864
2865         if (!id_priv->cma_dev) {
2866                 ret = cma_resolve_ib_dev(id_priv);
2867                 if (ret)
2868                         goto err;
2869         }
2870
2871         rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, (union ib_gid *)
2872                 &(((struct sockaddr_ib *) &id_priv->id.route.addr.dst_addr)->sib_addr));
2873
2874         work->id = id_priv;
2875         INIT_WORK(&work->work, cma_work_handler);
2876         work->old_state = RDMA_CM_ADDR_QUERY;
2877         work->new_state = RDMA_CM_ADDR_RESOLVED;
2878         work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
2879         queue_work(cma_wq, &work->work);
2880         return 0;
2881 err:
2882         kfree(work);
2883         return ret;
2884 }
2885
2886 static int cma_bind_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
2887                          struct sockaddr *dst_addr)
2888 {
2889         if (!src_addr || !src_addr->sa_family) {
2890                 src_addr = (struct sockaddr *) &id->route.addr.src_addr;
2891                 src_addr->sa_family = dst_addr->sa_family;
2892                 if (IS_ENABLED(CONFIG_IPV6) &&
2893                     dst_addr->sa_family == AF_INET6) {
2894                         struct sockaddr_in6 *src_addr6 = (struct sockaddr_in6 *) src_addr;
2895                         struct sockaddr_in6 *dst_addr6 = (struct sockaddr_in6 *) dst_addr;
2896                         src_addr6->sin6_scope_id = dst_addr6->sin6_scope_id;
2897                         if (ipv6_addr_type(&dst_addr6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
2898                                 id->route.addr.dev_addr.bound_dev_if = dst_addr6->sin6_scope_id;
2899                 } else if (dst_addr->sa_family == AF_IB) {
2900                         ((struct sockaddr_ib *) src_addr)->sib_pkey =
2901                                 ((struct sockaddr_ib *) dst_addr)->sib_pkey;
2902                 }
2903         }
2904         return rdma_bind_addr(id, src_addr);
2905 }
2906
2907 int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
2908                       struct sockaddr *dst_addr, int timeout_ms)
2909 {
2910         struct rdma_id_private *id_priv;
2911         int ret;
2912
2913         id_priv = container_of(id, struct rdma_id_private, id);
2914         memcpy(cma_dst_addr(id_priv), dst_addr, rdma_addr_size(dst_addr));
2915         if (id_priv->state == RDMA_CM_IDLE) {
2916                 ret = cma_bind_addr(id, src_addr, dst_addr);
2917                 if (ret) {
2918                         memset(cma_dst_addr(id_priv), 0, rdma_addr_size(dst_addr));
2919                         return ret;
2920                 }
2921         }
2922
2923         if (cma_family(id_priv) != dst_addr->sa_family) {
2924                 memset(cma_dst_addr(id_priv), 0, rdma_addr_size(dst_addr));
2925                 return -EINVAL;
2926         }
2927
2928         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_ADDR_QUERY)) {
2929                 memset(cma_dst_addr(id_priv), 0, rdma_addr_size(dst_addr));
2930                 return -EINVAL;
2931         }
2932
2933         atomic_inc(&id_priv->refcount);
2934         if (cma_any_addr(dst_addr)) {
2935                 ret = cma_resolve_loopback(id_priv);
2936         } else {
2937                 if (dst_addr->sa_family == AF_IB) {
2938                         ret = cma_resolve_ib_addr(id_priv);
2939                 } else {
2940                         ret = rdma_resolve_ip(&addr_client, cma_src_addr(id_priv),
2941                                               dst_addr, &id->route.addr.dev_addr,
2942                                               timeout_ms, addr_handler, id_priv);
2943                 }
2944         }
2945         if (ret)
2946                 goto err;
2947
2948         return 0;
2949 err:
2950         cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY, RDMA_CM_ADDR_BOUND);
2951         cma_deref_id(id_priv);
2952         return ret;
2953 }
2954 EXPORT_SYMBOL(rdma_resolve_addr);
2955
2956 int rdma_set_reuseaddr(struct rdma_cm_id *id, int reuse)
2957 {
2958         struct rdma_id_private *id_priv;
2959         unsigned long flags;
2960         int ret;
2961
2962         id_priv = container_of(id, struct rdma_id_private, id);
2963         spin_lock_irqsave(&id_priv->lock, flags);
2964         if (reuse || id_priv->state == RDMA_CM_IDLE) {
2965                 id_priv->reuseaddr = reuse;
2966                 ret = 0;
2967         } else {
2968                 ret = -EINVAL;
2969         }
2970         spin_unlock_irqrestore(&id_priv->lock, flags);
2971         return ret;
2972 }
2973 EXPORT_SYMBOL(rdma_set_reuseaddr);
2974
2975 int rdma_set_afonly(struct rdma_cm_id *id, int afonly)
2976 {
2977         struct rdma_id_private *id_priv;
2978         unsigned long flags;
2979         int ret;
2980
2981         id_priv = container_of(id, struct rdma_id_private, id);
2982         spin_lock_irqsave(&id_priv->lock, flags);
2983         if (id_priv->state == RDMA_CM_IDLE || id_priv->state == RDMA_CM_ADDR_BOUND) {
2984                 id_priv->options |= (1 << CMA_OPTION_AFONLY);
2985                 id_priv->afonly = afonly;
2986                 ret = 0;
2987         } else {
2988                 ret = -EINVAL;
2989         }
2990         spin_unlock_irqrestore(&id_priv->lock, flags);
2991         return ret;
2992 }
2993 EXPORT_SYMBOL(rdma_set_afonly);
2994
2995 static void cma_bind_port(struct rdma_bind_list *bind_list,
2996                           struct rdma_id_private *id_priv)
2997 {
2998         struct sockaddr *addr;
2999         struct sockaddr_ib *sib;
3000         u64 sid, mask;
3001         __be16 port;
3002
3003         lockdep_assert_held(&lock);
3004
3005         addr = cma_src_addr(id_priv);
3006         port = htons(bind_list->port);
3007
3008         switch (addr->sa_family) {
3009         case AF_INET:
3010                 ((struct sockaddr_in *) addr)->sin_port = port;
3011                 break;
3012         case AF_INET6:
3013                 ((struct sockaddr_in6 *) addr)->sin6_port = port;
3014                 break;
3015         case AF_IB:
3016                 sib = (struct sockaddr_ib *) addr;
3017                 sid = be64_to_cpu(sib->sib_sid);
3018                 mask = be64_to_cpu(sib->sib_sid_mask);
3019                 sib->sib_sid = cpu_to_be64((sid & mask) | (u64) ntohs(port));
3020                 sib->sib_sid_mask = cpu_to_be64(~0ULL);
3021                 break;
3022         }
3023         id_priv->bind_list = bind_list;
3024         hlist_add_head(&id_priv->node, &bind_list->owners);
3025 }
3026
3027 static int cma_alloc_port(enum rdma_port_space ps,
3028                           struct rdma_id_private *id_priv, unsigned short snum)
3029 {
3030         struct rdma_bind_list *bind_list;
3031         int ret;
3032
3033         lockdep_assert_held(&lock);
3034
3035         bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL);
3036         if (!bind_list)
3037                 return -ENOMEM;
3038
3039         ret = cma_ps_alloc(id_priv->id.route.addr.dev_addr.net, ps, bind_list,
3040                            snum);
3041         if (ret < 0)
3042                 goto err;
3043
3044         bind_list->ps = ps;
3045         bind_list->port = (unsigned short)ret;
3046         cma_bind_port(bind_list, id_priv);
3047         return 0;
3048 err:
3049         kfree(bind_list);
3050         return ret == -ENOSPC ? -EADDRNOTAVAIL : ret;
3051 }
3052
3053 static int cma_port_is_unique(struct rdma_bind_list *bind_list,
3054                               struct rdma_id_private *id_priv)
3055 {
3056         struct rdma_id_private *cur_id;
3057         struct sockaddr  *daddr = cma_dst_addr(id_priv);
3058         struct sockaddr  *saddr = cma_src_addr(id_priv);
3059         __be16 dport = cma_port(daddr);
3060
3061         lockdep_assert_held(&lock);
3062
3063         hlist_for_each_entry(cur_id, &bind_list->owners, node) {
3064                 struct sockaddr  *cur_daddr = cma_dst_addr(cur_id);
3065                 struct sockaddr  *cur_saddr = cma_src_addr(cur_id);
3066                 __be16 cur_dport = cma_port(cur_daddr);
3067
3068                 if (id_priv == cur_id)
3069                         continue;
3070
3071                 /* different dest port -> unique */
3072                 if (!cma_any_port(daddr) &&
3073                     !cma_any_port(cur_daddr) &&
3074                     (dport != cur_dport))
3075                         continue;
3076
3077                 /* different src address -> unique */
3078                 if (!cma_any_addr(saddr) &&
3079                     !cma_any_addr(cur_saddr) &&
3080                     cma_addr_cmp(saddr, cur_saddr))
3081                         continue;
3082
3083                 /* different dst address -> unique */
3084                 if (!cma_any_addr(daddr) &&
3085                     !cma_any_addr(cur_daddr) &&
3086                     cma_addr_cmp(daddr, cur_daddr))
3087                         continue;
3088
3089                 return -EADDRNOTAVAIL;
3090         }
3091         return 0;
3092 }
3093
3094 static int cma_alloc_any_port(enum rdma_port_space ps,
3095                               struct rdma_id_private *id_priv)
3096 {
3097         static unsigned int last_used_port;
3098         int low, high, remaining;
3099         unsigned int rover;
3100         struct net *net = id_priv->id.route.addr.dev_addr.net;
3101
3102         lockdep_assert_held(&lock);
3103
3104         inet_get_local_port_range(net, &low, &high);
3105         remaining = (high - low) + 1;
3106         rover = prandom_u32() % remaining + low;
3107 retry:
3108         if (last_used_port != rover) {
3109                 struct rdma_bind_list *bind_list;
3110                 int ret;
3111
3112                 bind_list = cma_ps_find(net, ps, (unsigned short)rover);
3113
3114                 if (!bind_list) {
3115                         ret = cma_alloc_port(ps, id_priv, rover);
3116                 } else {
3117                         ret = cma_port_is_unique(bind_list, id_priv);
3118                         if (!ret)
3119                                 cma_bind_port(bind_list, id_priv);
3120                 }
3121                 /*
3122                  * Remember previously used port number in order to avoid
3123                  * re-using same port immediately after it is closed.
3124                  */
3125                 if (!ret)
3126                         last_used_port = rover;
3127                 if (ret != -EADDRNOTAVAIL)
3128                         return ret;
3129         }
3130         if (--remaining) {
3131                 rover++;
3132                 if ((rover < low) || (rover > high))
3133                         rover = low;
3134                 goto retry;
3135         }
3136         return -EADDRNOTAVAIL;
3137 }
3138
3139 /*
3140  * Check that the requested port is available.  This is called when trying to
3141  * bind to a specific port, or when trying to listen on a bound port.  In
3142  * the latter case, the provided id_priv may already be on the bind_list, but
3143  * we still need to check that it's okay to start listening.
3144  */
3145 static int cma_check_port(struct rdma_bind_list *bind_list,
3146                           struct rdma_id_private *id_priv, uint8_t reuseaddr)
3147 {
3148         struct rdma_id_private *cur_id;
3149         struct sockaddr *addr, *cur_addr;
3150
3151         lockdep_assert_held(&lock);
3152
3153         addr = cma_src_addr(id_priv);
3154         hlist_for_each_entry(cur_id, &bind_list->owners, node) {
3155                 if (id_priv == cur_id)
3156                         continue;
3157
3158                 if ((cur_id->state != RDMA_CM_LISTEN) && reuseaddr &&
3159                     cur_id->reuseaddr)
3160                         continue;
3161
3162                 cur_addr = cma_src_addr(cur_id);
3163                 if (id_priv->afonly && cur_id->afonly &&
3164                     (addr->sa_family != cur_addr->sa_family))
3165                         continue;
3166
3167                 if (cma_any_addr(addr) || cma_any_addr(cur_addr))
3168                         return -EADDRNOTAVAIL;
3169
3170                 if (!cma_addr_cmp(addr, cur_addr))
3171                         return -EADDRINUSE;
3172         }
3173         return 0;
3174 }
3175
3176 static int cma_use_port(enum rdma_port_space ps,
3177                         struct rdma_id_private *id_priv)
3178 {
3179         struct rdma_bind_list *bind_list;
3180         unsigned short snum;
3181         int ret;
3182
3183         lockdep_assert_held(&lock);
3184
3185         snum = ntohs(cma_port(cma_src_addr(id_priv)));
3186         if (snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
3187                 return -EACCES;
3188
3189         bind_list = cma_ps_find(id_priv->id.route.addr.dev_addr.net, ps, snum);
3190         if (!bind_list) {
3191                 ret = cma_alloc_port(ps, id_priv, snum);
3192         } else {
3193                 ret = cma_check_port(bind_list, id_priv, id_priv->reuseaddr);
3194                 if (!ret)
3195                         cma_bind_port(bind_list, id_priv);
3196         }
3197         return ret;
3198 }
3199
3200 static int cma_bind_listen(struct rdma_id_private *id_priv)
3201 {
3202         struct rdma_bind_list *bind_list = id_priv->bind_list;
3203         int ret = 0;
3204
3205         mutex_lock(&lock);
3206         if (bind_list->owners.first->next)
3207                 ret = cma_check_port(bind_list, id_priv, 0);
3208         mutex_unlock(&lock);
3209         return ret;
3210 }
3211
3212 static enum rdma_port_space cma_select_inet_ps(
3213                 struct rdma_id_private *id_priv)
3214 {
3215         switch (id_priv->id.ps) {
3216         case RDMA_PS_TCP:
3217         case RDMA_PS_UDP:
3218         case RDMA_PS_IPOIB:
3219         case RDMA_PS_IB:
3220                 return id_priv->id.ps;
3221         default:
3222
3223                 return 0;
3224         }
3225 }
3226
3227 static enum rdma_port_space cma_select_ib_ps(struct rdma_id_private *id_priv)
3228 {
3229         enum rdma_port_space ps = 0;
3230         struct sockaddr_ib *sib;
3231         u64 sid_ps, mask, sid;
3232
3233         sib = (struct sockaddr_ib *) cma_src_addr(id_priv);
3234         mask = be64_to_cpu(sib->sib_sid_mask) & RDMA_IB_IP_PS_MASK;
3235         sid = be64_to_cpu(sib->sib_sid) & mask;
3236
3237         if ((id_priv->id.ps == RDMA_PS_IB) && (sid == (RDMA_IB_IP_PS_IB & mask))) {
3238                 sid_ps = RDMA_IB_IP_PS_IB;
3239                 ps = RDMA_PS_IB;
3240         } else if (((id_priv->id.ps == RDMA_PS_IB) || (id_priv->id.ps == RDMA_PS_TCP)) &&
3241                    (sid == (RDMA_IB_IP_PS_TCP & mask))) {
3242                 sid_ps = RDMA_IB_IP_PS_TCP;
3243                 ps = RDMA_PS_TCP;
3244         } else if (((id_priv->id.ps == RDMA_PS_IB) || (id_priv->id.ps == RDMA_PS_UDP)) &&
3245                    (sid == (RDMA_IB_IP_PS_UDP & mask))) {
3246                 sid_ps = RDMA_IB_IP_PS_UDP;
3247                 ps = RDMA_PS_UDP;
3248         }
3249
3250         if (ps) {
3251                 sib->sib_sid = cpu_to_be64(sid_ps | ntohs(cma_port((struct sockaddr *) sib)));
3252                 sib->sib_sid_mask = cpu_to_be64(RDMA_IB_IP_PS_MASK |
3253                                                 be64_to_cpu(sib->sib_sid_mask));
3254         }
3255         return ps;
3256 }
3257
3258 static int cma_get_port(struct rdma_id_private *id_priv)
3259 {
3260         enum rdma_port_space ps;
3261         int ret;
3262
3263         if (cma_family(id_priv) != AF_IB)
3264                 ps = cma_select_inet_ps(id_priv);
3265         else
3266                 ps = cma_select_ib_ps(id_priv);
3267         if (!ps)
3268                 return -EPROTONOSUPPORT;
3269
3270         mutex_lock(&lock);
3271         if (cma_any_port(cma_src_addr(id_priv)))
3272                 ret = cma_alloc_any_port(ps, id_priv);
3273         else
3274                 ret = cma_use_port(ps, id_priv);
3275         mutex_unlock(&lock);
3276
3277         return ret;
3278 }
3279
3280 static int cma_check_linklocal(struct rdma_dev_addr *dev_addr,
3281                                struct sockaddr *addr)
3282 {
3283 #if IS_ENABLED(CONFIG_IPV6)
3284         struct sockaddr_in6 *sin6;
3285
3286         if (addr->sa_family != AF_INET6)
3287                 return 0;
3288
3289         sin6 = (struct sockaddr_in6 *) addr;
3290
3291         if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
3292                 return 0;
3293
3294         if (!sin6->sin6_scope_id)
3295                         return -EINVAL;
3296
3297         dev_addr->bound_dev_if = sin6->sin6_scope_id;
3298 #endif
3299         return 0;
3300 }
3301
3302 int rdma_listen(struct rdma_cm_id *id, int backlog)
3303 {
3304         struct rdma_id_private *id_priv;
3305         int ret;
3306
3307         id_priv = container_of(id, struct rdma_id_private, id);
3308         if (id_priv->state == RDMA_CM_IDLE) {
3309                 id->route.addr.src_addr.ss_family = AF_INET;
3310                 ret = rdma_bind_addr(id, cma_src_addr(id_priv));
3311                 if (ret)
3312                         return ret;
3313         }
3314
3315         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_LISTEN))
3316                 return -EINVAL;
3317
3318         if (id_priv->reuseaddr) {
3319                 ret = cma_bind_listen(id_priv);
3320                 if (ret)
3321                         goto err;
3322         }
3323
3324         id_priv->backlog = backlog;
3325         if (id->device) {
3326                 if (rdma_cap_ib_cm(id->device, 1)) {
3327                         ret = cma_ib_listen(id_priv);
3328                         if (ret)
3329                                 goto err;
3330                 } else if (rdma_cap_iw_cm(id->device, 1)) {
3331                         ret = cma_iw_listen(id_priv, backlog);
3332                         if (ret)
3333                                 goto err;
3334                 } else {
3335                         ret = -ENOSYS;
3336                         goto err;
3337                 }
3338         } else
3339                 cma_listen_on_all(id_priv);
3340
3341         return 0;
3342 err:
3343         id_priv->backlog = 0;
3344         cma_comp_exch(id_priv, RDMA_CM_LISTEN, RDMA_CM_ADDR_BOUND);
3345         return ret;
3346 }
3347 EXPORT_SYMBOL(rdma_listen);
3348
3349 int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr)
3350 {
3351         struct rdma_id_private *id_priv;
3352         int ret;
3353         struct sockaddr  *daddr;
3354
3355         if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6 &&
3356             addr->sa_family != AF_IB)
3357                 return -EAFNOSUPPORT;
3358
3359         id_priv = container_of(id, struct rdma_id_private, id);
3360         if (!cma_comp_exch(id_priv, RDMA_CM_IDLE, RDMA_CM_ADDR_BOUND))
3361                 return -EINVAL;
3362
3363         ret = cma_check_linklocal(&id->route.addr.dev_addr, addr);
3364         if (ret)
3365                 goto err1;
3366
3367         memcpy(cma_src_addr(id_priv), addr, rdma_addr_size(addr));
3368         if (!cma_any_addr(addr)) {
3369                 ret = cma_translate_addr(addr, &id->route.addr.dev_addr);
3370                 if (ret)
3371                         goto err1;
3372
3373                 ret = cma_acquire_dev(id_priv, NULL);
3374                 if (ret)
3375                         goto err1;
3376         }
3377
3378         if (!(id_priv->options & (1 << CMA_OPTION_AFONLY))) {
3379                 if (addr->sa_family == AF_INET)
3380                         id_priv->afonly = 1;
3381 #if IS_ENABLED(CONFIG_IPV6)
3382                 else if (addr->sa_family == AF_INET6) {
3383                         struct net *net = id_priv->id.route.addr.dev_addr.net;
3384
3385                         id_priv->afonly = net->ipv6.sysctl.bindv6only;
3386                 }
3387 #endif
3388         }
3389         daddr = cma_dst_addr(id_priv);
3390         daddr->sa_family = addr->sa_family;
3391
3392         ret = cma_get_port(id_priv);
3393         if (ret)
3394                 goto err2;
3395
3396         return 0;
3397 err2:
3398         if (id_priv->cma_dev)
3399                 cma_release_dev(id_priv);
3400 err1:
3401         cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_IDLE);
3402         return ret;
3403 }
3404 EXPORT_SYMBOL(rdma_bind_addr);
3405
3406 static int cma_format_hdr(void *hdr, struct rdma_id_private *id_priv)
3407 {
3408         struct cma_hdr *cma_hdr;
3409
3410         cma_hdr = hdr;
3411         cma_hdr->cma_version = CMA_VERSION;
3412         if (cma_family(id_priv) == AF_INET) {
3413                 struct sockaddr_in *src4, *dst4;
3414
3415                 src4 = (struct sockaddr_in *) cma_src_addr(id_priv);
3416                 dst4 = (struct sockaddr_in *) cma_dst_addr(id_priv);
3417
3418                 cma_set_ip_ver(cma_hdr, 4);
3419                 cma_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
3420                 cma_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
3421                 cma_hdr->port = src4->sin_port;
3422         } else if (cma_family(id_priv) == AF_INET6) {
3423                 struct sockaddr_in6 *src6, *dst6;
3424
3425                 src6 = (struct sockaddr_in6 *) cma_src_addr(id_priv);
3426                 dst6 = (struct sockaddr_in6 *) cma_dst_addr(id_priv);
3427
3428                 cma_set_ip_ver(cma_hdr, 6);
3429                 cma_hdr->src_addr.ip6 = src6->sin6_addr;
3430                 cma_hdr->dst_addr.ip6 = dst6->sin6_addr;
3431                 cma_hdr->port = src6->sin6_port;
3432         }
3433         return 0;
3434 }
3435
3436 static int cma_sidr_rep_handler(struct ib_cm_id *cm_id,
3437                                 struct ib_cm_event *ib_event)
3438 {
3439         struct rdma_id_private *id_priv = cm_id->context;
3440         struct rdma_cm_event event;
3441         struct ib_cm_sidr_rep_event_param *rep = &ib_event->param.sidr_rep_rcvd;
3442         int ret = 0;
3443
3444         mutex_lock(&id_priv->handler_mutex);
3445         if (id_priv->state != RDMA_CM_CONNECT)
3446                 goto out;
3447
3448         memset(&event, 0, sizeof event);
3449         switch (ib_event->event) {
3450         case IB_CM_SIDR_REQ_ERROR:
3451                 event.event = RDMA_CM_EVENT_UNREACHABLE;
3452                 event.status = -ETIMEDOUT;
3453                 break;
3454         case IB_CM_SIDR_REP_RECEIVED:
3455                 event.param.ud.private_data = ib_event->private_data;
3456                 event.param.ud.private_data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
3457                 if (rep->status != IB_SIDR_SUCCESS) {
3458                         event.event = RDMA_CM_EVENT_UNREACHABLE;
3459                         event.status = ib_event->param.sidr_rep_rcvd.status;
3460                         pr_debug_ratelimited("RDMA CM: UNREACHABLE: bad SIDR reply. status %d\n",
3461                                              event.status);
3462                         break;
3463                 }
3464                 ret = cma_set_qkey(id_priv, rep->qkey);
3465                 if (ret) {
3466                         pr_debug_ratelimited("RDMA CM: ADDR_ERROR: failed to set qkey. status %d\n", ret);
3467                         event.event = RDMA_CM_EVENT_ADDR_ERROR;
3468                         event.status = ret;
3469                         break;
3470                 }
3471                 ib_init_ah_from_path(id_priv->id.device, id_priv->id.port_num,
3472                                      id_priv->id.route.path_rec,
3473                                      &event.param.ud.ah_attr);
3474                 event.param.ud.qp_num = rep->qpn;
3475                 event.param.ud.qkey = rep->qkey;
3476                 event.event = RDMA_CM_EVENT_ESTABLISHED;
3477                 event.status = 0;
3478                 break;
3479         default:
3480                 pr_err("RDMA CMA: unexpected IB CM event: %d\n",
3481                        ib_event->event);
3482                 goto out;
3483         }
3484
3485         ret = id_priv->id.event_handler(&id_priv->id, &event);
3486         if (ret) {
3487                 /* Destroy the CM ID by returning a non-zero value. */
3488                 id_priv->cm_id.ib = NULL;
3489                 cma_exch(id_priv, RDMA_CM_DESTROYING);
3490                 mutex_unlock(&id_priv->handler_mutex);
3491                 rdma_destroy_id(&id_priv->id);
3492                 return ret;
3493         }
3494 out:
3495         mutex_unlock(&id_priv->handler_mutex);
3496         return ret;
3497 }
3498
3499 static int cma_resolve_ib_udp(struct rdma_id_private *id_priv,
3500                               struct rdma_conn_param *conn_param)
3501 {
3502         struct ib_cm_sidr_req_param req;
3503         struct ib_cm_id *id;
3504         void *private_data;
3505         u8 offset;
3506         int ret;
3507
3508         memset(&req, 0, sizeof req);
3509         offset = cma_user_data_offset(id_priv);
3510         req.private_data_len = offset + conn_param->private_data_len;
3511         if (req.private_data_len < conn_param->private_data_len)
3512                 return -EINVAL;
3513
3514         if (req.private_data_len) {
3515                 private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
3516                 if (!private_data)
3517                         return -ENOMEM;
3518         } else {
3519                 private_data = NULL;
3520         }
3521
3522         if (conn_param->private_data && conn_param->private_data_len)
3523                 memcpy(private_data + offset, conn_param->private_data,
3524                        conn_param->private_data_len);
3525
3526         if (private_data) {
3527                 ret = cma_format_hdr(private_data, id_priv);
3528                 if (ret)
3529                         goto out;
3530                 req.private_data = private_data;
3531         }
3532
3533         id = ib_create_cm_id(id_priv->id.device, cma_sidr_rep_handler,
3534                              id_priv);
3535         if (IS_ERR(id)) {
3536                 ret = PTR_ERR(id);
3537                 goto out;
3538         }
3539         id_priv->cm_id.ib = id;
3540
3541         req.path = id_priv->id.route.path_rec;
3542         req.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
3543         req.timeout_ms = 1 << (CMA_CM_RESPONSE_TIMEOUT - 8);
3544         req.max_cm_retries = CMA_MAX_CM_RETRIES;
3545
3546         ret = ib_send_cm_sidr_req(id_priv->cm_id.ib, &req);
3547         if (ret) {
3548                 ib_destroy_cm_id(id_priv->cm_id.ib);
3549                 id_priv->cm_id.ib = NULL;
3550         }
3551 out:
3552         kfree(private_data);
3553         return ret;
3554 }
3555
3556 static int cma_connect_ib(struct rdma_id_private *id_priv,
3557                           struct rdma_conn_param *conn_param)
3558 {
3559         struct ib_cm_req_param req;
3560         struct rdma_route *route;
3561         void *private_data;
3562         struct ib_cm_id *id;
3563         u8 offset;
3564         int ret;
3565
3566         memset(&req, 0, sizeof req);
3567         offset = cma_user_data_offset(id_priv);
3568         req.private_data_len = offset + conn_param->private_data_len;
3569         if (req.private_data_len < conn_param->private_data_len)
3570                 return -EINVAL;
3571
3572         if (req.private_data_len) {
3573                 private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
3574                 if (!private_data)
3575                         return -ENOMEM;
3576         } else {
3577                 private_data = NULL;
3578         }
3579
3580         if (conn_param->private_data && conn_param->private_data_len)
3581                 memcpy(private_data + offset, conn_param->private_data,
3582                        conn_param->private_data_len);
3583
3584         id = ib_create_cm_id(id_priv->id.device, cma_ib_handler, id_priv);
3585         if (IS_ERR(id)) {
3586                 ret = PTR_ERR(id);
3587                 goto out;
3588         }
3589         id_priv->cm_id.ib = id;
3590
3591         route = &id_priv->id.route;
3592         if (private_data) {
3593                 ret = cma_format_hdr(private_data, id_priv);
3594                 if (ret)
3595                         goto out;
3596                 req.private_data = private_data;
3597         }
3598
3599         req.primary_path = &route->path_rec[0];
3600         if (route->num_paths == 2)
3601                 req.alternate_path = &route->path_rec[1];
3602
3603         req.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
3604         req.qp_num = id_priv->qp_num;
3605         req.qp_type = id_priv->id.qp_type;
3606         req.starting_psn = id_priv->seq_num;
3607         req.responder_resources = conn_param->responder_resources;
3608         req.initiator_depth = conn_param->initiator_depth;
3609         req.flow_control = conn_param->flow_control;
3610         req.retry_count = min_t(u8, 7, conn_param->retry_count);
3611         req.rnr_retry_count = min_t(u8, 7, conn_param->rnr_retry_count);
3612         req.remote_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
3613         req.local_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
3614         req.max_cm_retries = CMA_MAX_CM_RETRIES;
3615         req.srq = id_priv->srq ? 1 : 0;
3616
3617         ret = ib_send_cm_req(id_priv->cm_id.ib, &req);
3618 out:
3619         if (ret && !IS_ERR(id)) {
3620                 ib_destroy_cm_id(id);
3621                 id_priv->cm_id.ib = NULL;
3622         }
3623
3624         kfree(private_data);
3625         return ret;
3626 }
3627
3628 static int cma_connect_iw(struct rdma_id_private *id_priv,
3629                           struct rdma_conn_param *conn_param)
3630 {
3631         struct iw_cm_id *cm_id;
3632         int ret;
3633         struct iw_cm_conn_param iw_param;
3634
3635         cm_id = iw_create_cm_id(id_priv->id.device, cma_iw_handler, id_priv);
3636         if (IS_ERR(cm_id))
3637                 return PTR_ERR(cm_id);
3638
3639         cm_id->tos = id_priv->tos;
3640         id_priv->cm_id.iw = cm_id;
3641
3642         memcpy(&cm_id->local_addr, cma_src_addr(id_priv),
3643                rdma_addr_size(cma_src_addr(id_priv)));
3644         memcpy(&cm_id->remote_addr, cma_dst_addr(id_priv),
3645                rdma_addr_size(cma_dst_addr(id_priv)));
3646
3647         ret = cma_modify_qp_rtr(id_priv, conn_param);
3648         if (ret)
3649                 goto out;
3650
3651         if (conn_param) {
3652                 iw_param.ord = conn_param->initiator_depth;
3653                 iw_param.ird = conn_param->responder_resources;
3654                 iw_param.private_data = conn_param->private_data;
3655                 iw_param.private_data_len = conn_param->private_data_len;
3656                 iw_param.qpn = id_priv->id.qp ? id_priv->qp_num : conn_param->qp_num;
3657         } else {
3658                 memset(&iw_param, 0, sizeof iw_param);
3659                 iw_param.qpn = id_priv->qp_num;
3660         }
3661         ret = iw_cm_connect(cm_id, &iw_param);
3662 out:
3663         if (ret) {
3664                 iw_destroy_cm_id(cm_id);
3665                 id_priv->cm_id.iw = NULL;
3666         }
3667         return ret;
3668 }
3669
3670 int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
3671 {
3672         struct rdma_id_private *id_priv;
3673         int ret;
3674
3675         id_priv = container_of(id, struct rdma_id_private, id);
3676         if (!cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_CONNECT))
3677                 return -EINVAL;
3678
3679         if (!id->qp) {
3680                 id_priv->qp_num = conn_param->qp_num;
3681                 id_priv->srq = conn_param->srq;
3682         }
3683
3684         if (rdma_cap_ib_cm(id->device, id->port_num)) {
3685                 if (id->qp_type == IB_QPT_UD)
3686                         ret = cma_resolve_ib_udp(id_priv, conn_param);
3687                 else
3688                         ret = cma_connect_ib(id_priv, conn_param);
3689         } else if (rdma_cap_iw_cm(id->device, id->port_num))
3690                 ret = cma_connect_iw(id_priv, conn_param);
3691         else
3692                 ret = -ENOSYS;
3693         if (ret)
3694                 goto err;
3695
3696         return 0;
3697 err:
3698         cma_comp_exch(id_priv, RDMA_CM_CONNECT, RDMA_CM_ROUTE_RESOLVED);
3699         return ret;
3700 }
3701 EXPORT_SYMBOL(rdma_connect);
3702
3703 static int cma_accept_ib(struct rdma_id_private *id_priv,
3704                          struct rdma_conn_param *conn_param)
3705 {
3706         struct ib_cm_rep_param rep;
3707         int ret;
3708
3709         ret = cma_modify_qp_rtr(id_priv, conn_param);
3710         if (ret)
3711                 goto out;
3712
3713         ret = cma_modify_qp_rts(id_priv, conn_param);
3714         if (ret)
3715                 goto out;
3716
3717         memset(&rep, 0, sizeof rep);
3718         rep.qp_num = id_priv->qp_num;
3719         rep.starting_psn = id_priv->seq_num;
3720         rep.private_data = conn_param->private_data;
3721         rep.private_data_len = conn_param->private_data_len;
3722         rep.responder_resources = conn_param->responder_resources;
3723         rep.initiator_depth = conn_param->initiator_depth;
3724         rep.failover_accepted = 0;
3725         rep.flow_control = conn_param->flow_control;
3726         rep.rnr_retry_count = min_t(u8, 7, conn_param->rnr_retry_count);
3727         rep.srq = id_priv->srq ? 1 : 0;
3728
3729         ret = ib_send_cm_rep(id_priv->cm_id.ib, &rep);
3730 out:
3731         return ret;
3732 }
3733
3734 static int cma_accept_iw(struct rdma_id_private *id_priv,
3735                   struct rdma_conn_param *conn_param)
3736 {
3737         struct iw_cm_conn_param iw_param;
3738         int ret;
3739
3740         if (!conn_param)
3741                 return -EINVAL;
3742
3743         ret = cma_modify_qp_rtr(id_priv, conn_param);
3744         if (ret)
3745                 return ret;
3746
3747         iw_param.ord = conn_param->initiator_depth;
3748         iw_param.ird = conn_param->responder_resources;
3749         iw_param.private_data = conn_param->private_data;
3750         iw_param.private_data_len = conn_param->private_data_len;
3751         if (id_priv->id.qp) {
3752                 iw_param.qpn = id_priv->qp_num;
3753         } else
3754                 iw_param.qpn = conn_param->qp_num;
3755
3756         return iw_cm_accept(id_priv->cm_id.iw, &iw_param);
3757 }
3758
3759 static int cma_send_sidr_rep(struct rdma_id_private *id_priv,
3760                              enum ib_cm_sidr_status status, u32 qkey,
3761                              const void *private_data, int private_data_len)
3762 {
3763         struct ib_cm_sidr_rep_param rep;
3764         int ret;
3765
3766         memset(&rep, 0, sizeof rep);
3767         rep.status = status;
3768         if (status == IB_SIDR_SUCCESS) {
3769                 ret = cma_set_qkey(id_priv, qkey);
3770                 if (ret)
3771                         return ret;
3772                 rep.qp_num = id_priv->qp_num;
3773                 rep.qkey = id_priv->qkey;
3774         }
3775         rep.private_data = private_data;
3776         rep.private_data_len = private_data_len;
3777
3778         return ib_send_cm_sidr_rep(id_priv->cm_id.ib, &rep);
3779 }
3780
3781 int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
3782 {
3783         struct rdma_id_private *id_priv;
3784         int ret;
3785
3786         id_priv = container_of(id, struct rdma_id_private, id);
3787
3788         id_priv->owner = task_pid_nr(current);
3789
3790         if (!cma_comp(id_priv, RDMA_CM_CONNECT))
3791                 return -EINVAL;
3792
3793         if (!id->qp && conn_param) {
3794                 id_priv->qp_num = conn_param->qp_num;
3795                 id_priv->srq = conn_param->srq;
3796         }
3797
3798         if (rdma_cap_ib_cm(id->device, id->port_num)) {
3799                 if (id->qp_type == IB_QPT_UD) {
3800                         if (conn_param)
3801                                 ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
3802                                                         conn_param->qkey,
3803                                                         conn_param->private_data,
3804                                                         conn_param->private_data_len);
3805                         else
3806                                 ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
3807                                                         0, NULL, 0);
3808                 } else {
3809                         if (conn_param)
3810                                 ret = cma_accept_ib(id_priv, conn_param);
3811                         else
3812                                 ret = cma_rep_recv(id_priv);
3813                 }
3814         } else if (rdma_cap_iw_cm(id->device, id->port_num))
3815                 ret = cma_accept_iw(id_priv, conn_param);
3816         else
3817                 ret = -ENOSYS;
3818
3819         if (ret)
3820                 goto reject;
3821
3822         return 0;
3823 reject:
3824         cma_modify_qp_err(id_priv);
3825         rdma_reject(id, NULL, 0);
3826         return ret;
3827 }
3828 EXPORT_SYMBOL(rdma_accept);
3829
3830 int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event)
3831 {
3832         struct rdma_id_private *id_priv;
3833         int ret;
3834
3835         id_priv = container_of(id, struct rdma_id_private, id);
3836         if (!id_priv->cm_id.ib)
3837                 return -EINVAL;
3838
3839         switch (id->device->node_type) {
3840         case RDMA_NODE_IB_CA:
3841                 ret = ib_cm_notify(id_priv->cm_id.ib, event);
3842                 break;
3843         default:
3844                 ret = 0;
3845                 break;
3846         }
3847         return ret;
3848 }
3849 EXPORT_SYMBOL(rdma_notify);
3850
3851 int rdma_reject(struct rdma_cm_id *id, const void *private_data,
3852                 u8 private_data_len)
3853 {
3854         struct rdma_id_private *id_priv;
3855         int ret;
3856
3857         id_priv = container_of(id, struct rdma_id_private, id);
3858         if (!id_priv->cm_id.ib)
3859                 return -EINVAL;
3860
3861         if (rdma_cap_ib_cm(id->device, id->port_num)) {
3862                 if (id->qp_type == IB_QPT_UD)
3863                         ret = cma_send_sidr_rep(id_priv, IB_SIDR_REJECT, 0,
3864                                                 private_data, private_data_len);
3865                 else
3866                         ret = ib_send_cm_rej(id_priv->cm_id.ib,
3867                                              IB_CM_REJ_CONSUMER_DEFINED, NULL,
3868                                              0, private_data, private_data_len);
3869         } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
3870                 ret = iw_cm_reject(id_priv->cm_id.iw,
3871                                    private_data, private_data_len);
3872         } else
3873                 ret = -ENOSYS;
3874
3875         return ret;
3876 }
3877 EXPORT_SYMBOL(rdma_reject);
3878
3879 int rdma_disconnect(struct rdma_cm_id *id)
3880 {
3881         struct rdma_id_private *id_priv;
3882         int ret;
3883
3884         id_priv = container_of(id, struct rdma_id_private, id);
3885         if (!id_priv->cm_id.ib)
3886                 return -EINVAL;
3887
3888         if (rdma_cap_ib_cm(id->device, id->port_num)) {
3889                 ret = cma_modify_qp_err(id_priv);
3890                 if (ret)
3891                         goto out;
3892                 /* Initiate or respond to a disconnect. */
3893                 if (ib_send_cm_dreq(id_priv->cm_id.ib, NULL, 0))
3894                         ib_send_cm_drep(id_priv->cm_id.ib, NULL, 0);
3895         } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
3896                 ret = iw_cm_disconnect(id_priv->cm_id.iw, 0);
3897         } else
3898                 ret = -EINVAL;
3899
3900 out:
3901         return ret;
3902 }
3903 EXPORT_SYMBOL(rdma_disconnect);
3904
3905 static int cma_ib_mc_handler(int status, struct ib_sa_multicast *multicast)
3906 {
3907         struct rdma_id_private *id_priv;
3908         struct cma_multicast *mc = multicast->context;
3909         struct rdma_cm_event event;
3910         int ret = 0;
3911
3912         id_priv = mc->id_priv;
3913         mutex_lock(&id_priv->handler_mutex);
3914         if (id_priv->state != RDMA_CM_ADDR_BOUND &&
3915             id_priv->state != RDMA_CM_ADDR_RESOLVED)
3916                 goto out;
3917
3918         if (!status)
3919                 status = cma_set_qkey(id_priv, be32_to_cpu(multicast->rec.qkey));
3920         else
3921                 pr_debug_ratelimited("RDMA CM: MULTICAST_ERROR: failed to join multicast. status %d\n",
3922                                      status);
3923         mutex_lock(&id_priv->qp_mutex);
3924         if (!status && id_priv->id.qp) {
3925                 status = ib_attach_mcast(id_priv->id.qp, &multicast->rec.mgid,
3926                                          be16_to_cpu(multicast->rec.mlid));
3927                 if (status)
3928                         pr_debug_ratelimited("RDMA CM: MULTICAST_ERROR: failed to attach QP. status %d\n",
3929                                              status);
3930         }
3931         mutex_unlock(&id_priv->qp_mutex);
3932
3933         memset(&event, 0, sizeof event);
3934         event.status = status;
3935         event.param.ud.private_data = mc->context;
3936         if (!status) {
3937                 struct rdma_dev_addr *dev_addr =
3938                         &id_priv->id.route.addr.dev_addr;
3939                 struct net_device *ndev =
3940                         dev_get_by_index(&init_net, dev_addr->bound_dev_if);
3941                 enum ib_gid_type gid_type =
3942                         id_priv->cma_dev->default_gid_type[id_priv->id.port_num -
3943                         rdma_start_port(id_priv->cma_dev->device)];
3944
3945                 event.event = RDMA_CM_EVENT_MULTICAST_JOIN;
3946                 ib_init_ah_from_mcmember(id_priv->id.device,
3947                                          id_priv->id.port_num, &multicast->rec,
3948                                          ndev, gid_type,
3949                                          &event.param.ud.ah_attr);
3950                 event.param.ud.qp_num = 0xFFFFFF;
3951                 event.param.ud.qkey = be32_to_cpu(multicast->rec.qkey);
3952                 if (ndev)
3953                         dev_put(ndev);
3954         } else
3955                 event.event = RDMA_CM_EVENT_MULTICAST_ERROR;
3956
3957         ret = id_priv->id.event_handler(&id_priv->id, &event);
3958         if (ret) {
3959                 cma_exch(id_priv, RDMA_CM_DESTROYING);
3960                 mutex_unlock(&id_priv->handler_mutex);
3961                 rdma_destroy_id(&id_priv->id);
3962                 return 0;
3963         }
3964
3965 out:
3966         mutex_unlock(&id_priv->handler_mutex);
3967         return 0;
3968 }
3969
3970 static void cma_set_mgid(struct rdma_id_private *id_priv,
3971                          struct sockaddr *addr, union ib_gid *mgid)
3972 {
3973         unsigned char mc_map[MAX_ADDR_LEN];
3974         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
3975         struct sockaddr_in *sin = (struct sockaddr_in *) addr;
3976         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) addr;
3977
3978         if (cma_any_addr(addr)) {
3979                 memset(mgid, 0, sizeof *mgid);
3980         } else if ((addr->sa_family == AF_INET6) &&
3981                    ((be32_to_cpu(sin6->sin6_addr.s6_addr32[0]) & 0xFFF0FFFF) ==
3982                                                                  0xFF10A01B)) {
3983                 /* IPv6 address is an SA assigned MGID. */
3984                 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
3985         } else if (addr->sa_family == AF_IB) {
3986                 memcpy(mgid, &((struct sockaddr_ib *) addr)->sib_addr, sizeof *mgid);
3987         } else if ((addr->sa_family == AF_INET6)) {
3988                 ipv6_ib_mc_map(&sin6->sin6_addr, dev_addr->broadcast, mc_map);
3989                 if (id_priv->id.ps == RDMA_PS_UDP)
3990                         mc_map[7] = 0x01;       /* Use RDMA CM signature */
3991                 *mgid = *(union ib_gid *) (mc_map + 4);
3992         } else {
3993                 ip_ib_mc_map(sin->sin_addr.s_addr, dev_addr->broadcast, mc_map);
3994                 if (id_priv->id.ps == RDMA_PS_UDP)
3995                         mc_map[7] = 0x01;       /* Use RDMA CM signature */
3996                 *mgid = *(union ib_gid *) (mc_map + 4);
3997         }
3998 }
3999
4000 static int cma_join_ib_multicast(struct rdma_id_private *id_priv,
4001                                  struct cma_multicast *mc)
4002 {
4003         struct ib_sa_mcmember_rec rec;
4004         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
4005         ib_sa_comp_mask comp_mask;
4006         int ret;
4007
4008         ib_addr_get_mgid(dev_addr, &rec.mgid);
4009         ret = ib_sa_get_mcmember_rec(id_priv->id.device, id_priv->id.port_num,
4010                                      &rec.mgid, &rec);
4011         if (ret)
4012                 return ret;
4013
4014         ret = cma_set_qkey(id_priv, 0);
4015         if (ret)
4016                 return ret;
4017
4018         cma_set_mgid(id_priv, (struct sockaddr *) &mc->addr, &rec.mgid);
4019         rec.qkey = cpu_to_be32(id_priv->qkey);
4020         rdma_addr_get_sgid(dev_addr, &rec.port_gid);
4021         rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
4022         rec.join_state = mc->join_state;
4023
4024         if ((rec.join_state == BIT(SENDONLY_FULLMEMBER_JOIN)) &&
4025             (!ib_sa_sendonly_fullmem_support(&sa_client,
4026                                              id_priv->id.device,
4027                                              id_priv->id.port_num))) {
4028                 pr_warn("RDMA CM: %s port %u Unable to multicast join\n"
4029                         "RDMA CM: SM doesn't support Send Only Full Member option\n",
4030                         id_priv->id.device->name, id_priv->id.port_num);
4031                 return -EOPNOTSUPP;
4032         }
4033
4034         comp_mask = IB_SA_MCMEMBER_REC_MGID | IB_SA_MCMEMBER_REC_PORT_GID |
4035                     IB_SA_MCMEMBER_REC_PKEY | IB_SA_MCMEMBER_REC_JOIN_STATE |
4036                     IB_SA_MCMEMBER_REC_QKEY | IB_SA_MCMEMBER_REC_SL |
4037                     IB_SA_MCMEMBER_REC_FLOW_LABEL |
4038                     IB_SA_MCMEMBER_REC_TRAFFIC_CLASS;
4039
4040         if (id_priv->id.ps == RDMA_PS_IPOIB)
4041                 comp_mask |= IB_SA_MCMEMBER_REC_RATE |
4042                              IB_SA_MCMEMBER_REC_RATE_SELECTOR |
4043                              IB_SA_MCMEMBER_REC_MTU_SELECTOR |
4044                              IB_SA_MCMEMBER_REC_MTU |
4045                              IB_SA_MCMEMBER_REC_HOP_LIMIT;
4046
4047         mc->multicast.ib = ib_sa_join_multicast(&sa_client, id_priv->id.device,
4048                                                 id_priv->id.port_num, &rec,
4049                                                 comp_mask, GFP_KERNEL,
4050                                                 cma_ib_mc_handler, mc);
4051         return PTR_ERR_OR_ZERO(mc->multicast.ib);
4052 }
4053
4054 static void iboe_mcast_work_handler(struct work_struct *work)
4055 {
4056         struct iboe_mcast_work *mw = container_of(work, struct iboe_mcast_work, work);
4057         struct cma_multicast *mc = mw->mc;
4058         struct ib_sa_multicast *m = mc->multicast.ib;
4059
4060         mc->multicast.ib->context = mc;
4061         cma_ib_mc_handler(0, m);
4062         kref_put(&mc->mcref, release_mc);
4063         kfree(mw);
4064 }
4065
4066 static void cma_iboe_set_mgid(struct sockaddr *addr, union ib_gid *mgid,
4067                               enum ib_gid_type gid_type)
4068 {
4069         struct sockaddr_in *sin = (struct sockaddr_in *)addr;
4070         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr;
4071
4072         if (cma_any_addr(addr)) {
4073                 memset(mgid, 0, sizeof *mgid);
4074         } else if (addr->sa_family == AF_INET6) {
4075                 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
4076         } else {
4077                 mgid->raw[0] = (gid_type == IB_GID_TYPE_IB) ? 0xff : 0;
4078                 mgid->raw[1] = (gid_type == IB_GID_TYPE_IB) ? 0x0e : 0;
4079                 mgid->raw[2] = 0;
4080                 mgid->raw[3] = 0;
4081                 mgid->raw[4] = 0;
4082                 mgid->raw[5] = 0;
4083                 mgid->raw[6] = 0;
4084                 mgid->raw[7] = 0;
4085                 mgid->raw[8] = 0;
4086                 mgid->raw[9] = 0;
4087                 mgid->raw[10] = 0xff;
4088                 mgid->raw[11] = 0xff;
4089                 *(__be32 *)(&mgid->raw[12]) = sin->sin_addr.s_addr;
4090         }
4091 }
4092
4093 static int cma_iboe_join_multicast(struct rdma_id_private *id_priv,
4094                                    struct cma_multicast *mc)
4095 {
4096         struct iboe_mcast_work *work;
4097         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
4098         int err = 0;
4099         struct sockaddr *addr = (struct sockaddr *)&mc->addr;
4100         struct net_device *ndev = NULL;
4101         enum ib_gid_type gid_type;
4102         bool send_only;
4103
4104         send_only = mc->join_state == BIT(SENDONLY_FULLMEMBER_JOIN);
4105
4106         if (cma_zero_addr((struct sockaddr *)&mc->addr))
4107                 return -EINVAL;
4108
4109         work = kzalloc(sizeof *work, GFP_KERNEL);
4110         if (!work)
4111                 return -ENOMEM;
4112
4113         mc->multicast.ib = kzalloc(sizeof(struct ib_sa_multicast), GFP_KERNEL);
4114         if (!mc->multicast.ib) {
4115                 err = -ENOMEM;
4116                 goto out1;
4117         }
4118
4119         gid_type = id_priv->cma_dev->default_gid_type[id_priv->id.port_num -
4120                    rdma_start_port(id_priv->cma_dev->device)];
4121         cma_iboe_set_mgid(addr, &mc->multicast.ib->rec.mgid, gid_type);
4122
4123         mc->multicast.ib->rec.pkey = cpu_to_be16(0xffff);
4124         if (id_priv->id.ps == RDMA_PS_UDP)
4125                 mc->multicast.ib->rec.qkey = cpu_to_be32(RDMA_UDP_QKEY);
4126
4127         if (dev_addr->bound_dev_if)
4128                 ndev = dev_get_by_index(&init_net, dev_addr->bound_dev_if);
4129         if (!ndev) {
4130                 err = -ENODEV;
4131                 goto out2;
4132         }
4133         mc->multicast.ib->rec.rate = iboe_get_rate(ndev);
4134         mc->multicast.ib->rec.hop_limit = 1;
4135         mc->multicast.ib->rec.mtu = iboe_get_mtu(ndev->mtu);
4136
4137         if (addr->sa_family == AF_INET) {
4138                 if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) {
4139                         mc->multicast.ib->rec.hop_limit = IPV6_DEFAULT_HOPLIMIT;
4140                         if (!send_only) {
4141                                 err = cma_igmp_send(ndev, &mc->multicast.ib->rec.mgid,
4142                                                     true);
4143                                 if (!err)
4144                                         mc->igmp_joined = true;
4145                         }
4146                 }
4147         } else {
4148                 if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP)
4149                         err = -ENOTSUPP;
4150         }
4151         dev_put(ndev);
4152         if (err || !mc->multicast.ib->rec.mtu) {
4153                 if (!err)
4154                         err = -EINVAL;
4155                 goto out2;
4156         }
4157         rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
4158                     &mc->multicast.ib->rec.port_gid);
4159         work->id = id_priv;
4160         work->mc = mc;
4161         INIT_WORK(&work->work, iboe_mcast_work_handler);
4162         kref_get(&mc->mcref);
4163         queue_work(cma_wq, &work->work);
4164
4165         return 0;
4166
4167 out2:
4168         kfree(mc->multicast.ib);
4169 out1:
4170         kfree(work);
4171         return err;
4172 }
4173
4174 int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
4175                         u8 join_state, void *context)
4176 {
4177         struct rdma_id_private *id_priv;
4178         struct cma_multicast *mc;
4179         int ret;
4180
4181         if (!id->device)
4182                 return -EINVAL;
4183
4184         id_priv = container_of(id, struct rdma_id_private, id);
4185         if (!cma_comp(id_priv, RDMA_CM_ADDR_BOUND) &&
4186             !cma_comp(id_priv, RDMA_CM_ADDR_RESOLVED))
4187                 return -EINVAL;
4188
4189         mc = kmalloc(sizeof *mc, GFP_KERNEL);
4190         if (!mc)
4191                 return -ENOMEM;
4192
4193         memcpy(&mc->addr, addr, rdma_addr_size(addr));
4194         mc->context = context;
4195         mc->id_priv = id_priv;
4196         mc->igmp_joined = false;
4197         mc->join_state = join_state;
4198         spin_lock(&id_priv->lock);
4199         list_add(&mc->list, &id_priv->mc_list);
4200         spin_unlock(&id_priv->lock);
4201
4202         if (rdma_protocol_roce(id->device, id->port_num)) {
4203                 kref_init(&mc->mcref);
4204                 ret = cma_iboe_join_multicast(id_priv, mc);
4205         } else if (rdma_cap_ib_mcast(id->device, id->port_num))
4206                 ret = cma_join_ib_multicast(id_priv, mc);
4207         else
4208                 ret = -ENOSYS;
4209
4210         if (ret) {
4211                 spin_lock_irq(&id_priv->lock);
4212                 list_del(&mc->list);
4213                 spin_unlock_irq(&id_priv->lock);
4214                 kfree(mc);
4215         }
4216         return ret;
4217 }
4218 EXPORT_SYMBOL(rdma_join_multicast);
4219
4220 void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr)
4221 {
4222         struct rdma_id_private *id_priv;
4223         struct cma_multicast *mc;
4224
4225         id_priv = container_of(id, struct rdma_id_private, id);
4226         spin_lock_irq(&id_priv->lock);
4227         list_for_each_entry(mc, &id_priv->mc_list, list) {
4228                 if (!memcmp(&mc->addr, addr, rdma_addr_size(addr))) {
4229                         list_del(&mc->list);
4230                         spin_unlock_irq(&id_priv->lock);
4231
4232                         if (id->qp)
4233                                 ib_detach_mcast(id->qp,
4234                                                 &mc->multicast.ib->rec.mgid,
4235                                                 be16_to_cpu(mc->multicast.ib->rec.mlid));
4236
4237                         BUG_ON(id_priv->cma_dev->device != id->device);
4238
4239                         if (rdma_cap_ib_mcast(id->device, id->port_num)) {
4240                                 ib_sa_free_multicast(mc->multicast.ib);
4241                                 kfree(mc);
4242                         } else if (rdma_protocol_roce(id->device, id->port_num)) {
4243                                 if (mc->igmp_joined) {
4244                                         struct rdma_dev_addr *dev_addr =
4245                                                 &id->route.addr.dev_addr;
4246                                         struct net_device *ndev = NULL;
4247
4248                                         if (dev_addr->bound_dev_if)
4249                                                 ndev = dev_get_by_index(&init_net,
4250                                                                         dev_addr->bound_dev_if);
4251                                         if (ndev) {
4252                                                 cma_igmp_send(ndev,
4253                                                               &mc->multicast.ib->rec.mgid,
4254                                                               false);
4255                                                 dev_put(ndev);
4256                                         }
4257                                         mc->igmp_joined = false;
4258                                 }
4259                                 kref_put(&mc->mcref, release_mc);
4260                         }
4261                         return;
4262                 }
4263         }
4264         spin_unlock_irq(&id_priv->lock);
4265 }
4266 EXPORT_SYMBOL(rdma_leave_multicast);
4267
4268 static int cma_netdev_change(struct net_device *ndev, struct rdma_id_private *id_priv)
4269 {
4270         struct rdma_dev_addr *dev_addr;
4271         struct cma_ndev_work *work;
4272
4273         dev_addr = &id_priv->id.route.addr.dev_addr;
4274
4275         if ((dev_addr->bound_dev_if == ndev->ifindex) &&
4276             (net_eq(dev_net(ndev), dev_addr->net)) &&
4277             memcmp(dev_addr->src_dev_addr, ndev->dev_addr, ndev->addr_len)) {
4278                 pr_info("RDMA CM addr change for ndev %s used by id %p\n",
4279                         ndev->name, &id_priv->id);
4280                 work = kzalloc(sizeof *work, GFP_KERNEL);
4281                 if (!work)
4282                         return -ENOMEM;
4283
4284                 INIT_WORK(&work->work, cma_ndev_work_handler);
4285                 work->id = id_priv;
4286                 work->event.event = RDMA_CM_EVENT_ADDR_CHANGE;
4287                 atomic_inc(&id_priv->refcount);
4288                 queue_work(cma_wq, &work->work);
4289         }
4290
4291         return 0;
4292 }
4293
4294 static int cma_netdev_callback(struct notifier_block *self, unsigned long event,
4295                                void *ptr)
4296 {
4297         struct net_device *ndev = netdev_notifier_info_to_dev(ptr);
4298         struct cma_device *cma_dev;
4299         struct rdma_id_private *id_priv;
4300         int ret = NOTIFY_DONE;
4301
4302         if (event != NETDEV_BONDING_FAILOVER)
4303                 return NOTIFY_DONE;
4304
4305         if (!(ndev->flags & IFF_MASTER) || !(ndev->priv_flags & IFF_BONDING))
4306                 return NOTIFY_DONE;
4307
4308         mutex_lock(&lock);
4309         list_for_each_entry(cma_dev, &dev_list, list)
4310                 list_for_each_entry(id_priv, &cma_dev->id_list, list) {
4311                         ret = cma_netdev_change(ndev, id_priv);
4312                         if (ret)
4313                                 goto out;
4314                 }
4315
4316 out:
4317         mutex_unlock(&lock);
4318         return ret;
4319 }
4320
4321 static struct notifier_block cma_nb = {
4322         .notifier_call = cma_netdev_callback
4323 };
4324
4325 static void cma_add_one(struct ib_device *device)
4326 {
4327         struct cma_device *cma_dev;
4328         struct rdma_id_private *id_priv;
4329         unsigned int i;
4330         unsigned long supported_gids = 0;
4331
4332         cma_dev = kmalloc(sizeof *cma_dev, GFP_KERNEL);
4333         if (!cma_dev)
4334                 return;
4335
4336         cma_dev->device = device;
4337         cma_dev->default_gid_type = kcalloc(device->phys_port_cnt,
4338                                             sizeof(*cma_dev->default_gid_type),
4339                                             GFP_KERNEL);
4340         if (!cma_dev->default_gid_type)
4341                 goto free_cma_dev;
4342
4343         cma_dev->default_roce_tos = kcalloc(device->phys_port_cnt,
4344                                             sizeof(*cma_dev->default_roce_tos),
4345                                             GFP_KERNEL);
4346         if (!cma_dev->default_roce_tos)
4347                 goto free_gid_type;
4348
4349         for (i = rdma_start_port(device); i <= rdma_end_port(device); i++) {
4350                 supported_gids = roce_gid_type_mask_support(device, i);
4351                 WARN_ON(!supported_gids);
4352                 if (supported_gids & (1 << CMA_PREFERRED_ROCE_GID_TYPE))
4353                         cma_dev->default_gid_type[i - rdma_start_port(device)] =
4354                                 CMA_PREFERRED_ROCE_GID_TYPE;
4355                 else
4356                         cma_dev->default_gid_type[i - rdma_start_port(device)] =
4357                                 find_first_bit(&supported_gids, BITS_PER_LONG);
4358                 cma_dev->default_roce_tos[i - rdma_start_port(device)] = 0;
4359         }
4360
4361         init_completion(&cma_dev->comp);
4362         atomic_set(&cma_dev->refcount, 1);
4363         INIT_LIST_HEAD(&cma_dev->id_list);
4364         ib_set_client_data(device, &cma_client, cma_dev);
4365
4366         mutex_lock(&lock);
4367         list_add_tail(&cma_dev->list, &dev_list);
4368         list_for_each_entry(id_priv, &listen_any_list, list)
4369                 cma_listen_on_dev(id_priv, cma_dev);
4370         mutex_unlock(&lock);
4371
4372         return;
4373
4374 free_gid_type:
4375         kfree(cma_dev->default_gid_type);
4376
4377 free_cma_dev:
4378         kfree(cma_dev);
4379
4380         return;
4381 }
4382
4383 static int cma_remove_id_dev(struct rdma_id_private *id_priv)
4384 {
4385         struct rdma_cm_event event;
4386         enum rdma_cm_state state;
4387         int ret = 0;
4388
4389         /* Record that we want to remove the device */
4390         state = cma_exch(id_priv, RDMA_CM_DEVICE_REMOVAL);
4391         if (state == RDMA_CM_DESTROYING)
4392                 return 0;
4393
4394         cma_cancel_operation(id_priv, state);
4395         mutex_lock(&id_priv->handler_mutex);
4396
4397         /* Check for destruction from another callback. */
4398         if (!cma_comp(id_priv, RDMA_CM_DEVICE_REMOVAL))
4399                 goto out;
4400
4401         memset(&event, 0, sizeof event);
4402         event.event = RDMA_CM_EVENT_DEVICE_REMOVAL;
4403         ret = id_priv->id.event_handler(&id_priv->id, &event);
4404 out:
4405         mutex_unlock(&id_priv->handler_mutex);
4406         return ret;
4407 }
4408
4409 static void cma_process_remove(struct cma_device *cma_dev)
4410 {
4411         struct rdma_id_private *id_priv;
4412         int ret;
4413
4414         mutex_lock(&lock);
4415         while (!list_empty(&cma_dev->id_list)) {
4416                 id_priv = list_entry(cma_dev->id_list.next,
4417                                      struct rdma_id_private, list);
4418
4419                 list_del(&id_priv->listen_list);
4420                 list_del_init(&id_priv->list);
4421                 atomic_inc(&id_priv->refcount);
4422                 mutex_unlock(&lock);
4423
4424                 ret = id_priv->internal_id ? 1 : cma_remove_id_dev(id_priv);
4425                 cma_deref_id(id_priv);
4426                 if (ret)
4427                         rdma_destroy_id(&id_priv->id);
4428
4429                 mutex_lock(&lock);
4430         }
4431         mutex_unlock(&lock);
4432
4433         cma_deref_dev(cma_dev);
4434         wait_for_completion(&cma_dev->comp);
4435 }
4436
4437 static void cma_remove_one(struct ib_device *device, void *client_data)
4438 {
4439         struct cma_device *cma_dev = client_data;
4440
4441         if (!cma_dev)
4442                 return;
4443
4444         mutex_lock(&lock);
4445         list_del(&cma_dev->list);
4446         mutex_unlock(&lock);
4447
4448         cma_process_remove(cma_dev);
4449         kfree(cma_dev->default_roce_tos);
4450         kfree(cma_dev->default_gid_type);
4451         kfree(cma_dev);
4452 }
4453
4454 static int cma_get_id_stats(struct sk_buff *skb, struct netlink_callback *cb)
4455 {
4456         struct nlmsghdr *nlh;
4457         struct rdma_cm_id_stats *id_stats;
4458         struct rdma_id_private *id_priv;
4459         struct rdma_cm_id *id = NULL;
4460         struct cma_device *cma_dev;
4461         int i_dev = 0, i_id = 0;
4462
4463         /*
4464          * We export all of the IDs as a sequence of messages.  Each
4465          * ID gets its own netlink message.
4466          */
4467         mutex_lock(&lock);
4468
4469         list_for_each_entry(cma_dev, &dev_list, list) {
4470                 if (i_dev < cb->args[0]) {
4471                         i_dev++;
4472                         continue;
4473                 }
4474
4475                 i_id = 0;
4476                 list_for_each_entry(id_priv, &cma_dev->id_list, list) {
4477                         if (i_id < cb->args[1]) {
4478                                 i_id++;
4479                                 continue;
4480                         }
4481
4482                         id_stats = ibnl_put_msg(skb, &nlh, cb->nlh->nlmsg_seq,
4483                                                 sizeof *id_stats, RDMA_NL_RDMA_CM,
4484                                                 RDMA_NL_RDMA_CM_ID_STATS,
4485                                                 NLM_F_MULTI);
4486                         if (!id_stats)
4487                                 goto out;
4488
4489                         memset(id_stats, 0, sizeof *id_stats);
4490                         id = &id_priv->id;
4491                         id_stats->node_type = id->route.addr.dev_addr.dev_type;
4492                         id_stats->port_num = id->port_num;
4493                         id_stats->bound_dev_if =
4494                                 id->route.addr.dev_addr.bound_dev_if;
4495
4496                         if (ibnl_put_attr(skb, nlh,
4497                                           rdma_addr_size(cma_src_addr(id_priv)),
4498                                           cma_src_addr(id_priv),
4499                                           RDMA_NL_RDMA_CM_ATTR_SRC_ADDR))
4500                                 goto out;
4501                         if (ibnl_put_attr(skb, nlh,
4502                                           rdma_addr_size(cma_dst_addr(id_priv)),
4503                                           cma_dst_addr(id_priv),
4504                                           RDMA_NL_RDMA_CM_ATTR_DST_ADDR))
4505                                 goto out;
4506
4507                         id_stats->pid           = id_priv->owner;
4508                         id_stats->port_space    = id->ps;
4509                         id_stats->cm_state      = id_priv->state;
4510                         id_stats->qp_num        = id_priv->qp_num;
4511                         id_stats->qp_type       = id->qp_type;
4512
4513                         i_id++;
4514                         nlmsg_end(skb, nlh);
4515                 }
4516
4517                 cb->args[1] = 0;
4518                 i_dev++;
4519         }
4520
4521 out:
4522         mutex_unlock(&lock);
4523         cb->args[0] = i_dev;
4524         cb->args[1] = i_id;
4525
4526         return skb->len;
4527 }
4528
4529 static const struct rdma_nl_cbs cma_cb_table[RDMA_NL_RDMA_CM_NUM_OPS] = {
4530         [RDMA_NL_RDMA_CM_ID_STATS] = { .dump = cma_get_id_stats},
4531 };
4532
4533 static int cma_init_net(struct net *net)
4534 {
4535         struct cma_pernet *pernet = cma_pernet(net);
4536
4537         idr_init(&pernet->tcp_ps);
4538         idr_init(&pernet->udp_ps);
4539         idr_init(&pernet->ipoib_ps);
4540         idr_init(&pernet->ib_ps);
4541
4542         return 0;
4543 }
4544
4545 static void cma_exit_net(struct net *net)
4546 {
4547         struct cma_pernet *pernet = cma_pernet(net);
4548
4549         idr_destroy(&pernet->tcp_ps);
4550         idr_destroy(&pernet->udp_ps);
4551         idr_destroy(&pernet->ipoib_ps);
4552         idr_destroy(&pernet->ib_ps);
4553 }
4554
4555 static struct pernet_operations cma_pernet_operations = {
4556         .init = cma_init_net,
4557         .exit = cma_exit_net,
4558         .id = &cma_pernet_id,
4559         .size = sizeof(struct cma_pernet),
4560 };
4561
4562 static int __init cma_init(void)
4563 {
4564         int ret;
4565
4566         cma_wq = alloc_ordered_workqueue("rdma_cm", WQ_MEM_RECLAIM);
4567         if (!cma_wq)
4568                 return -ENOMEM;
4569
4570         ret = register_pernet_subsys(&cma_pernet_operations);
4571         if (ret)
4572                 goto err_wq;
4573
4574         ib_sa_register_client(&sa_client);
4575         rdma_addr_register_client(&addr_client);
4576         register_netdevice_notifier(&cma_nb);
4577
4578         ret = ib_register_client(&cma_client);
4579         if (ret)
4580                 goto err;
4581
4582         rdma_nl_register(RDMA_NL_RDMA_CM, cma_cb_table);
4583         cma_configfs_init();
4584
4585         return 0;
4586
4587 err:
4588         unregister_netdevice_notifier(&cma_nb);
4589         rdma_addr_unregister_client(&addr_client);
4590         ib_sa_unregister_client(&sa_client);
4591         unregister_pernet_subsys(&cma_pernet_operations);
4592 err_wq:
4593         destroy_workqueue(cma_wq);
4594         return ret;
4595 }
4596
4597 static void __exit cma_cleanup(void)
4598 {
4599         cma_configfs_exit();
4600         rdma_nl_unregister(RDMA_NL_RDMA_CM);
4601         ib_unregister_client(&cma_client);
4602         unregister_netdevice_notifier(&cma_nb);
4603         rdma_addr_unregister_client(&addr_client);
4604         ib_sa_unregister_client(&sa_client);
4605         unregister_pernet_subsys(&cma_pernet_operations);
4606         destroy_workqueue(cma_wq);
4607 }
4608
4609 MODULE_ALIAS_RDMA_NETLINK(RDMA_NL_RDMA_CM, 1);
4610
4611 module_init(cma_init);
4612 module_exit(cma_cleanup);