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
  76 static const char * const cma_events[] = {
  77         [RDMA_CM_EVENT_ADDR_RESOLVED]    = "address resolved",
  78         [RDMA_CM_EVENT_ADDR_ERROR]       = "address error",
  79         [RDMA_CM_EVENT_ROUTE_RESOLVED]   = "route resolved ",
  80         [RDMA_CM_EVENT_ROUTE_ERROR]      = "route error",
  81         [RDMA_CM_EVENT_CONNECT_REQUEST]  = "connect request",
  82         [RDMA_CM_EVENT_CONNECT_RESPONSE] = "connect response",
  83         [RDMA_CM_EVENT_CONNECT_ERROR]    = "connect error",
  84         [RDMA_CM_EVENT_UNREACHABLE]      = "unreachable",
  85         [RDMA_CM_EVENT_REJECTED]         = "rejected",
  86         [RDMA_CM_EVENT_ESTABLISHED]      = "established",
  87         [RDMA_CM_EVENT_DISCONNECTED]     = "disconnected",
  88         [RDMA_CM_EVENT_DEVICE_REMOVAL]   = "device removal",
  89         [RDMA_CM_EVENT_MULTICAST_JOIN]   = "multicast join",
  90         [RDMA_CM_EVENT_MULTICAST_ERROR]  = "multicast error",
  91         [RDMA_CM_EVENT_ADDR_CHANGE]      = "address change",
  92         [RDMA_CM_EVENT_TIMEWAIT_EXIT]    = "timewait exit",
  93 };
  94
  95 const char *__attribute_const__ rdma_event_msg(enum rdma_cm_event_type event)
  96 {
  97         size_t index = event;
  98
  99         return (index < ARRAY_SIZE(cma_events) && cma_events[index]) ?
 100                         cma_events[index] : "unrecognized event";
 101 }
 102 EXPORT_SYMBOL(rdma_event_msg);
 103
 104 static void cma_add_one(struct ib_device *device);
 105 static void cma_remove_one(struct ib_device *device, void *client_data);
 106
 107 static struct ib_client cma_client = {
 108         .name   = "cma",
 109         .add    = cma_add_one,
 110         .remove = cma_remove_one
 111 };
 112
 113 static struct ib_sa_client sa_client;
 114 static struct rdma_addr_client addr_client;
 115 static LIST_HEAD(dev_list);
 116 static LIST_HEAD(listen_any_list);
 117 static DEFINE_MUTEX(lock);
 118 static struct workqueue_struct *cma_wq;
 119 static int cma_pernet_id;
 120
 121 struct cma_pernet {
 122         struct idr tcp_ps;
 123         struct idr udp_ps;
 124         struct idr ipoib_ps;
 125         struct idr ib_ps;
 126 };
 127
 128 static struct cma_pernet *cma_pernet(struct net *net)
 129 {
 130         return net_generic(net, cma_pernet_id);
 131 }
 132
 133 static struct idr *cma_pernet_idr(struct net *net, enum rdma_port_space ps)
 134 {
 135         struct cma_pernet *pernet = cma_pernet(net);
 136
 137         switch (ps) {
 138         case RDMA_PS_TCP:
 139                 return &pernet->tcp_ps;
 140         case RDMA_PS_UDP:
 141                 return &pernet->udp_ps;
 142         case RDMA_PS_IPOIB:
 143                 return &pernet->ipoib_ps;
 144         case RDMA_PS_IB:
 145                 return &pernet->ib_ps;
 146         default:
 147                 return NULL;
 148         }
 149 }
 150
 151 struct cma_device {
 152         struct list_head        list;
 153         struct ib_device        *device;
 154         struct completion       comp;
 155         atomic_t                refcount;
 156         struct list_head        id_list;
 157         enum ib_gid_type        *default_gid_type;
 158 };
 159
 160 struct rdma_bind_list {
 161         enum rdma_port_space    ps;
 162         struct hlist_head       owners;
 163         unsigned short          port;
 164 };
 165
 166 struct class_port_info_context {
 167         struct ib_class_port_info       *class_port_info;
 168         struct ib_device                *device;
 169         struct completion               done;
 170         struct ib_sa_query              *sa_query;
 171         u8                              port_num;
 172 };
 173
 174 static int cma_ps_alloc(struct net *net, enum rdma_port_space ps,
 175                         struct rdma_bind_list *bind_list, int snum)
 176 {
 177         struct idr *idr = cma_pernet_idr(net, ps);
 178
 179         return idr_alloc(idr, bind_list, snum, snum + 1, GFP_KERNEL);
 180 }
 181
 182 static struct rdma_bind_list *cma_ps_find(struct net *net,
 183                                           enum rdma_port_space ps, int snum)
 184 {
 185         struct idr *idr = cma_pernet_idr(net, ps);
 186
 187         return idr_find(idr, snum);
 188 }
 189
 190 static void cma_ps_remove(struct net *net, enum rdma_port_space ps, int snum)
 191 {
 192         struct idr *idr = cma_pernet_idr(net, ps);
 193
 194         idr_remove(idr, snum);
 195 }
 196
 197 enum {
 198         CMA_OPTION_AFONLY,
 199 };
 200
 201 void cma_ref_dev(struct cma_device *cma_dev)
 202 {
 203         atomic_inc(&cma_dev->refcount);
 204 }
 205
 206 struct cma_device *cma_enum_devices_by_ibdev(cma_device_filter  filter,
 207                                              void               *cookie)
 208 {
 209         struct cma_device *cma_dev;
 210         struct cma_device *found_cma_dev = NULL;
 211
 212         mutex_lock(&lock);
 213
 214         list_for_each_entry(cma_dev, &dev_list, list)
 215                 if (filter(cma_dev->device, cookie)) {
 216                         found_cma_dev = cma_dev;
 217                         break;
 218                 }
 219
 220         if (found_cma_dev)
 221                 cma_ref_dev(found_cma_dev);
 222         mutex_unlock(&lock);
 223         return found_cma_dev;
 224 }
 225
 226 int cma_get_default_gid_type(struct cma_device *cma_dev,
 227                              unsigned int port)
 228 {
 229         if (port < rdma_start_port(cma_dev->device) ||
 230             port > rdma_end_port(cma_dev->device))
 231                 return -EINVAL;
 232
 233         return cma_dev->default_gid_type[port - rdma_start_port(cma_dev->device)];
 234 }
 235
 236 int cma_set_default_gid_type(struct cma_device *cma_dev,
 237                              unsigned int port,
 238                              enum ib_gid_type default_gid_type)
 239 {
 240         unsigned long supported_gids;
 241
 242         if (port < rdma_start_port(cma_dev->device) ||
 243             port > rdma_end_port(cma_dev->device))
 244                 return -EINVAL;
 245
 246         supported_gids = roce_gid_type_mask_support(cma_dev->device, port);
 247
 248         if (!(supported_gids & 1 << default_gid_type))
 249                 return -EINVAL;
 250
 251         cma_dev->default_gid_type[port - rdma_start_port(cma_dev->device)] =
 252                 default_gid_type;
 253
 254         return 0;
 255 }
 256
 257 struct ib_device *cma_get_ib_dev(struct cma_device *cma_dev)
 258 {
 259         return cma_dev->device;
 260 }
 261
 262 /*
 263  * Device removal can occur at anytime, so we need extra handling to
 264  * serialize notifying the user of device removal with other callbacks.
 265  * We do this by disabling removal notification while a callback is in process,
 266  * and reporting it after the callback completes.
 267  */
 268 struct rdma_id_private {
 269         struct rdma_cm_id       id;
 270
 271         struct rdma_bind_list   *bind_list;
 272         struct hlist_node       node;
 273         struct list_head        list; /* listen_any_list or cma_device.list */
 274         struct list_head        listen_list; /* per device listens */
 275         struct cma_device       *cma_dev;
 276         struct list_head        mc_list;
 277
 278         int                     internal_id;
 279         enum rdma_cm_state      state;
 280         spinlock_t              lock;
 281         struct mutex            qp_mutex;
 282
 283         struct completion       comp;
 284         atomic_t                refcount;
 285         struct mutex            handler_mutex;
 286
 287         int                     backlog;
 288         int                     timeout_ms;
 289         struct ib_sa_query      *query;
 290         int                     query_id;
 291         union {
 292                 struct ib_cm_id *ib;
 293                 struct iw_cm_id *iw;
 294         } cm_id;
 295
 296         u32                     seq_num;
 297         u32                     qkey;
 298         u32                     qp_num;
 299         pid_t                   owner;
 300         u32                     options;
 301         u8                      srq;
 302         u8                      tos;
 303         u8                      reuseaddr;
 304         u8                      afonly;
 305         enum ib_gid_type        gid_type;
 306 };
 307
 308 struct cma_multicast {
 309         struct rdma_id_private *id_priv;
 310         union {
 311                 struct ib_sa_multicast *ib;
 312         } multicast;
 313         struct list_head        list;
 314         void                    *context;
 315         struct sockaddr_storage addr;
 316         struct kref             mcref;
 317         bool                    igmp_joined;
 318         u8                      join_state;
 319 };
 320
 321 struct cma_work {
 322         struct work_struct      work;
 323         struct rdma_id_private  *id;
 324         enum rdma_cm_state      old_state;
 325         enum rdma_cm_state      new_state;
 326         struct rdma_cm_event    event;
 327 };
 328
 329 struct cma_ndev_work {
 330         struct work_struct      work;
 331         struct rdma_id_private  *id;
 332         struct rdma_cm_event    event;
 333 };
 334
 335 struct iboe_mcast_work {
 336         struct work_struct       work;
 337         struct rdma_id_private  *id;
 338         struct cma_multicast    *mc;
 339 };
 340
 341 union cma_ip_addr {
 342         struct in6_addr ip6;
 343         struct {
 344                 __be32 pad[3];
 345                 __be32 addr;
 346         } ip4;
 347 };
 348
 349 struct cma_hdr {
 350         u8 cma_version;
 351         u8 ip_version;  /* IP version: 7:4 */
 352         __be16 port;
 353         union cma_ip_addr src_addr;
 354         union cma_ip_addr dst_addr;
 355 };
 356
 357 #define CMA_VERSION 0x00
 358
 359 struct cma_req_info {
 360         struct ib_device *device;
 361         int port;
 362         union ib_gid local_gid;
 363         __be64 service_id;
 364         u16 pkey;
 365         bool has_gid:1;
 366 };
 367
 368 static int cma_comp(struct rdma_id_private *id_priv, enum rdma_cm_state comp)
 369 {
 370         unsigned long flags;
 371         int ret;
 372
 373         spin_lock_irqsave(&id_priv->lock, flags);
 374         ret = (id_priv->state == comp);
 375         spin_unlock_irqrestore(&id_priv->lock, flags);
 376         return ret;
 377 }
 378
 379 static int cma_comp_exch(struct rdma_id_private *id_priv,
 380                          enum rdma_cm_state comp, enum rdma_cm_state exch)
 381 {
 382         unsigned long flags;
 383         int ret;
 384
 385         spin_lock_irqsave(&id_priv->lock, flags);
 386         if ((ret = (id_priv->state == comp)))
 387                 id_priv->state = exch;
 388         spin_unlock_irqrestore(&id_priv->lock, flags);
 389         return ret;
 390 }
 391
 392 static enum rdma_cm_state cma_exch(struct rdma_id_private *id_priv,
 393                                    enum rdma_cm_state exch)
 394 {
 395         unsigned long flags;
 396         enum rdma_cm_state old;
 397
 398         spin_lock_irqsave(&id_priv->lock, flags);
 399         old = id_priv->state;
 400         id_priv->state = exch;
 401         spin_unlock_irqrestore(&id_priv->lock, flags);
 402         return old;
 403 }
 404
 405 static inline u8 cma_get_ip_ver(const struct cma_hdr *hdr)
 406 {
 407         return hdr->ip_version >> 4;
 408 }
 409
 410 static inline void cma_set_ip_ver(struct cma_hdr *hdr, u8 ip_ver)
 411 {
 412         hdr->ip_version = (ip_ver << 4) | (hdr->ip_version & 0xF);
 413 }
 414
 415 static int cma_igmp_send(struct net_device *ndev, union ib_gid *mgid, bool join)
 416 {
 417         struct in_device *in_dev = NULL;
 418
 419         if (ndev) {
 420                 rtnl_lock();
 421                 in_dev = __in_dev_get_rtnl(ndev);
 422                 if (in_dev) {
 423                         if (join)
 424                                 ip_mc_inc_group(in_dev,
 425                                                 *(__be32 *)(mgid->raw + 12));
 426                         else
 427                                 ip_mc_dec_group(in_dev,
 428                                                 *(__be32 *)(mgid->raw + 12));
 429                 }
 430                 rtnl_unlock();
 431         }
 432         return (in_dev) ? 0 : -ENODEV;
 433 }
 434
 435 static void _cma_attach_to_dev(struct rdma_id_private *id_priv,
 436                                struct cma_device *cma_dev)
 437 {
 438         cma_ref_dev(cma_dev);
 439         id_priv->cma_dev = cma_dev;
 440         id_priv->gid_type = 0;
 441         id_priv->id.device = cma_dev->device;
 442         id_priv->id.route.addr.dev_addr.transport =
 443                 rdma_node_get_transport(cma_dev->device->node_type);
 444         list_add_tail(&id_priv->list, &cma_dev->id_list);
 445 }
 446
 447 static void cma_attach_to_dev(struct rdma_id_private *id_priv,
 448                               struct cma_device *cma_dev)
 449 {
 450         _cma_attach_to_dev(id_priv, cma_dev);
 451         id_priv->gid_type =
 452                 cma_dev->default_gid_type[id_priv->id.port_num -
 453                                           rdma_start_port(cma_dev->device)];
 454 }
 455
 456 void cma_deref_dev(struct cma_device *cma_dev)
 457 {
 458         if (atomic_dec_and_test(&cma_dev->refcount))
 459                 complete(&cma_dev->comp);
 460 }
 461
 462 static inline void release_mc(struct kref *kref)
 463 {
 464         struct cma_multicast *mc = container_of(kref, struct cma_multicast, mcref);
 465
 466         kfree(mc->multicast.ib);
 467         kfree(mc);
 468 }
 469
 470 static void cma_release_dev(struct rdma_id_private *id_priv)
 471 {
 472         mutex_lock(&lock);
 473         list_del(&id_priv->list);
 474         cma_deref_dev(id_priv->cma_dev);
 475         id_priv->cma_dev = NULL;
 476         mutex_unlock(&lock);
 477 }
 478
 479 static inline struct sockaddr *cma_src_addr(struct rdma_id_private *id_priv)
 480 {
 481         return (struct sockaddr *) &id_priv->id.route.addr.src_addr;
 482 }
 483
 484 static inline struct sockaddr *cma_dst_addr(struct rdma_id_private *id_priv)
 485 {
 486         return (struct sockaddr *) &id_priv->id.route.addr.dst_addr;
 487 }
 488
 489 static inline unsigned short cma_family(struct rdma_id_private *id_priv)
 490 {
 491         return id_priv->id.route.addr.src_addr.ss_family;
 492 }
 493
 494 static int cma_set_qkey(struct rdma_id_private *id_priv, u32 qkey)
 495 {
 496         struct ib_sa_mcmember_rec rec;
 497         int ret = 0;
 498
 499         if (id_priv->qkey) {
 500                 if (qkey && id_priv->qkey != qkey)
 501                         return -EINVAL;
 502                 return 0;
 503         }
 504
 505         if (qkey) {
 506                 id_priv->qkey = qkey;
 507                 return 0;
 508         }
 509
 510         switch (id_priv->id.ps) {
 511         case RDMA_PS_UDP:
 512         case RDMA_PS_IB:
 513                 id_priv->qkey = RDMA_UDP_QKEY;
 514                 break;
 515         case RDMA_PS_IPOIB:
 516                 ib_addr_get_mgid(&id_priv->id.route.addr.dev_addr, &rec.mgid);
 517                 ret = ib_sa_get_mcmember_rec(id_priv->id.device,
 518                                              id_priv->id.port_num, &rec.mgid,
 519                                              &rec);
 520                 if (!ret)
 521                         id_priv->qkey = be32_to_cpu(rec.qkey);
 522                 break;
 523         default:
 524                 break;
 525         }
 526         return ret;
 527 }
 528
 529 static void cma_translate_ib(struct sockaddr_ib *sib, struct rdma_dev_addr *dev_addr)
 530 {
 531         dev_addr->dev_type = ARPHRD_INFINIBAND;
 532         rdma_addr_set_sgid(dev_addr, (union ib_gid *) &sib->sib_addr);
 533         ib_addr_set_pkey(dev_addr, ntohs(sib->sib_pkey));
 534 }
 535
 536 static int cma_translate_addr(struct sockaddr *addr, struct rdma_dev_addr *dev_addr)
 537 {
 538         int ret;
 539
 540         if (addr->sa_family != AF_IB) {
 541                 ret = rdma_translate_ip(addr, dev_addr, NULL);
 542         } else {
 543                 cma_translate_ib((struct sockaddr_ib *) addr, dev_addr);
 544                 ret = 0;
 545         }
 546
 547         return ret;
 548 }
 549
 550 static inline int cma_validate_port(struct ib_device *device, u8 port,
 551                                     enum ib_gid_type gid_type,
 552                                       union ib_gid *gid, int dev_type,
 553                                       int bound_if_index)
 554 {
 555         int ret = -ENODEV;
 556         struct net_device *ndev = NULL;
 557
 558         if ((dev_type == ARPHRD_INFINIBAND) && !rdma_protocol_ib(device, port))
 559                 return ret;
 560
 561         if ((dev_type != ARPHRD_INFINIBAND) && rdma_protocol_ib(device, port))
 562                 return ret;
 563
 564         if (dev_type == ARPHRD_ETHER && rdma_protocol_roce(device, port)) {
 565                 ndev = dev_get_by_index(&init_net, bound_if_index);
 566                 if (ndev && ndev->flags & IFF_LOOPBACK) {
 567                         pr_info("detected loopback device\n");
 568                         dev_put(ndev);
 569
 570                         if (!device->get_netdev)
 571                                 return -EOPNOTSUPP;
 572
 573                         ndev = device->get_netdev(device, port);
 574                         if (!ndev)
 575                                 return -ENODEV;
 576                 }
 577         } else {
 578                 gid_type = IB_GID_TYPE_IB;
 579         }
 580
 581         ret = ib_find_cached_gid_by_port(device, gid, gid_type, port,
 582                                          ndev, NULL);
 583
 584         if (ndev)
 585                 dev_put(ndev);
 586
 587         return ret;
 588 }
 589
 590 static int cma_acquire_dev(struct rdma_id_private *id_priv,
 591                            struct rdma_id_private *listen_id_priv)
 592 {
 593         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
 594         struct cma_device *cma_dev;
 595         union ib_gid gid, iboe_gid, *gidp;
 596         int ret = -ENODEV;
 597         u8 port;
 598
 599         if (dev_addr->dev_type != ARPHRD_INFINIBAND &&
 600             id_priv->id.ps == RDMA_PS_IPOIB)
 601                 return -EINVAL;
 602
 603         mutex_lock(&lock);
 604         rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
 605                     &iboe_gid);
 606
 607         memcpy(&gid, dev_addr->src_dev_addr +
 608                rdma_addr_gid_offset(dev_addr), sizeof gid);
 609
 610         if (listen_id_priv) {
 611                 cma_dev = listen_id_priv->cma_dev;
 612                 port = listen_id_priv->id.port_num;
 613                 gidp = rdma_protocol_roce(cma_dev->device, port) ?
 614                        &iboe_gid : &gid;
 615
 616                 ret = cma_validate_port(cma_dev->device, port,
 617                                         rdma_protocol_ib(cma_dev->device, port) ?
 618                                         IB_GID_TYPE_IB :
 619                                         listen_id_priv->gid_type, gidp,
 620                                         dev_addr->dev_type,
 621                                         dev_addr->bound_dev_if);
 622                 if (!ret) {
 623                         id_priv->id.port_num = port;
 624                         goto out;
 625                 }
 626         }
 627
 628         list_for_each_entry(cma_dev, &dev_list, list) {
 629                 for (port = 1; port <= cma_dev->device->phys_port_cnt; ++port) {
 630                         if (listen_id_priv &&
 631                             listen_id_priv->cma_dev == cma_dev &&
 632                             listen_id_priv->id.port_num == port)
 633                                 continue;
 634
 635                         gidp = rdma_protocol_roce(cma_dev->device, port) ?
 636                                &iboe_gid : &gid;
 637
 638                         ret = cma_validate_port(cma_dev->device, port,
 639                                                 rdma_protocol_ib(cma_dev->device, port) ?
 640                                                 IB_GID_TYPE_IB :
 641                                                 cma_dev->default_gid_type[port - 1],
 642                                                 gidp, dev_addr->dev_type,
 643                                                 dev_addr->bound_dev_if);
 644                         if (!ret) {
 645                                 id_priv->id.port_num = port;
 646                                 goto out;
 647                         }
 648                 }
 649         }
 650
 651 out:
 652         if (!ret)
 653                 cma_attach_to_dev(id_priv, cma_dev);
 654
 655         mutex_unlock(&lock);
 656         return ret;
 657 }
 658
 659 /*
 660  * Select the source IB device and address to reach the destination IB address.
 661  */
 662 static int cma_resolve_ib_dev(struct rdma_id_private *id_priv)
 663 {
 664         struct cma_device *cma_dev, *cur_dev;
 665         struct sockaddr_ib *addr;
 666         union ib_gid gid, sgid, *dgid;
 667         u16 pkey, index;
 668         u8 p;
 669         int i;
 670
 671         cma_dev = NULL;
 672         addr = (struct sockaddr_ib *) cma_dst_addr(id_priv);
 673         dgid = (union ib_gid *) &addr->sib_addr;
 674         pkey = ntohs(addr->sib_pkey);
 675
 676         mutex_lock(&lock);
 677         list_for_each_entry(cur_dev, &dev_list, list) {
 678                 for (p = 1; p <= cur_dev->device->phys_port_cnt; ++p) {
 679                         if (!rdma_cap_af_ib(cur_dev->device, p))
 680                                 continue;
 681
 682                         if (ib_find_cached_pkey(cur_dev->device, p, pkey, &index))
 683                                 continue;
 684
 685                         for (i = 0; !ib_get_cached_gid(cur_dev->device, p, i,
 686                                                        &gid, NULL);
 687                              i++) {
 688                                 if (!memcmp(&gid, dgid, sizeof(gid))) {
 689                                         cma_dev = cur_dev;
 690                                         sgid = gid;
 691                                         id_priv->id.port_num = p;
 692                                         goto found;
 693                                 }
 694
 695                                 if (!cma_dev && (gid.global.subnet_prefix ==
 696                                                  dgid->global.subnet_prefix)) {
 697                                         cma_dev = cur_dev;
 698                                         sgid = gid;
 699                                         id_priv->id.port_num = p;
 700                                         goto found;
 701                                 }
 702                         }
 703                 }
 704         }
 705         mutex_unlock(&lock);
 706         return -ENODEV;
 707
 708 found:
 709         cma_attach_to_dev(id_priv, cma_dev);
 710         mutex_unlock(&lock);
 711         addr = (struct sockaddr_ib *)cma_src_addr(id_priv);
 712         memcpy(&addr->sib_addr, &sgid, sizeof(sgid));
 713         cma_translate_ib(addr, &id_priv->id.route.addr.dev_addr);
 714         return 0;
 715 }
 716
 717 static void cma_deref_id(struct rdma_id_private *id_priv)
 718 {
 719         if (atomic_dec_and_test(&id_priv->refcount))
 720                 complete(&id_priv->comp);
 721 }
 722
 723 struct rdma_cm_id *rdma_create_id(struct net *net,
 724                                   rdma_cm_event_handler event_handler,
 725                                   void *context, enum rdma_port_space ps,
 726                                   enum ib_qp_type qp_type)
 727 {
 728         struct rdma_id_private *id_priv;
 729
 730         id_priv = kzalloc(sizeof *id_priv, GFP_KERNEL);
 731         if (!id_priv)
 732                 return ERR_PTR(-ENOMEM);
 733
 734         id_priv->owner = task_pid_nr(current);
 735         id_priv->state = RDMA_CM_IDLE;
 736         id_priv->id.context = context;
 737         id_priv->id.event_handler = event_handler;
 738         id_priv->id.ps = ps;
 739         id_priv->id.qp_type = qp_type;
 740         spin_lock_init(&id_priv->lock);
 741         mutex_init(&id_priv->qp_mutex);
 742         init_completion(&id_priv->comp);
 743         atomic_set(&id_priv->refcount, 1);
 744         mutex_init(&id_priv->handler_mutex);
 745         INIT_LIST_HEAD(&id_priv->listen_list);
 746         INIT_LIST_HEAD(&id_priv->mc_list);
 747         get_random_bytes(&id_priv->seq_num, sizeof id_priv->seq_num);
 748         id_priv->id.route.addr.dev_addr.net = get_net(net);
 749         id_priv->seq_num &= 0x00ffffff;
 750
 751         return &id_priv->id;
 752 }
 753 EXPORT_SYMBOL(rdma_create_id);
 754
 755 static int cma_init_ud_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
 756 {
 757         struct ib_qp_attr qp_attr;
 758         int qp_attr_mask, ret;
 759
 760         qp_attr.qp_state = IB_QPS_INIT;
 761         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 762         if (ret)
 763                 return ret;
 764
 765         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 766         if (ret)
 767                 return ret;
 768
 769         qp_attr.qp_state = IB_QPS_RTR;
 770         ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
 771         if (ret)
 772                 return ret;
 773
 774         qp_attr.qp_state = IB_QPS_RTS;
 775         qp_attr.sq_psn = 0;
 776         ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE | IB_QP_SQ_PSN);
 777
 778         return ret;
 779 }
 780
 781 static int cma_init_conn_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
 782 {
 783         struct ib_qp_attr qp_attr;
 784         int qp_attr_mask, ret;
 785
 786         qp_attr.qp_state = IB_QPS_INIT;
 787         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 788         if (ret)
 789                 return ret;
 790
 791         return ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 792 }
 793
 794 int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
 795                    struct ib_qp_init_attr *qp_init_attr)
 796 {
 797         struct rdma_id_private *id_priv;
 798         struct ib_qp *qp;
 799         int ret;
 800
 801         id_priv = container_of(id, struct rdma_id_private, id);
 802         if (id->device != pd->device)
 803                 return -EINVAL;
 804
 805         qp_init_attr->port_num = id->port_num;
 806         qp = ib_create_qp(pd, qp_init_attr);
 807         if (IS_ERR(qp))
 808                 return PTR_ERR(qp);
 809
 810         if (id->qp_type == IB_QPT_UD)
 811                 ret = cma_init_ud_qp(id_priv, qp);
 812         else
 813                 ret = cma_init_conn_qp(id_priv, qp);
 814         if (ret)
 815                 goto err;
 816
 817         id->qp = qp;
 818         id_priv->qp_num = qp->qp_num;
 819         id_priv->srq = (qp->srq != NULL);
 820         return 0;
 821 err:
 822         ib_destroy_qp(qp);
 823         return ret;
 824 }
 825 EXPORT_SYMBOL(rdma_create_qp);
 826
 827 void rdma_destroy_qp(struct rdma_cm_id *id)
 828 {
 829         struct rdma_id_private *id_priv;
 830
 831         id_priv = container_of(id, struct rdma_id_private, id);
 832         mutex_lock(&id_priv->qp_mutex);
 833         ib_destroy_qp(id_priv->id.qp);
 834         id_priv->id.qp = NULL;
 835         mutex_unlock(&id_priv->qp_mutex);
 836 }
 837 EXPORT_SYMBOL(rdma_destroy_qp);
 838
 839 static int cma_modify_qp_rtr(struct rdma_id_private *id_priv,
 840                              struct rdma_conn_param *conn_param)
 841 {
 842         struct ib_qp_attr qp_attr;
 843         int qp_attr_mask, ret;
 844         union ib_gid sgid;
 845
 846         mutex_lock(&id_priv->qp_mutex);
 847         if (!id_priv->id.qp) {
 848                 ret = 0;
 849                 goto out;
 850         }
 851
 852         /* Need to update QP attributes from default values. */
 853         qp_attr.qp_state = IB_QPS_INIT;
 854         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 855         if (ret)
 856                 goto out;
 857
 858         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
 859         if (ret)
 860                 goto out;
 861
 862         qp_attr.qp_state = IB_QPS_RTR;
 863         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 864         if (ret)
 865                 goto out;
 866
 867         ret = ib_query_gid(id_priv->id.device, id_priv->id.port_num,
 868                            qp_attr.ah_attr.grh.sgid_index, &sgid, NULL);
 869         if (ret)
 870                 goto out;
 871
 872         BUG_ON(id_priv->cma_dev->device != id_priv->id.device);
 873
 874         if (conn_param)
 875                 qp_attr.max_dest_rd_atomic = conn_param->responder_resources;
 876         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
 877 out:
 878         mutex_unlock(&id_priv->qp_mutex);
 879         return ret;
 880 }
 881
 882 static int cma_modify_qp_rts(struct rdma_id_private *id_priv,
 883                              struct rdma_conn_param *conn_param)
 884 {
 885         struct ib_qp_attr qp_attr;
 886         int qp_attr_mask, ret;
 887
 888         mutex_lock(&id_priv->qp_mutex);
 889         if (!id_priv->id.qp) {
 890                 ret = 0;
 891                 goto out;
 892         }
 893
 894         qp_attr.qp_state = IB_QPS_RTS;
 895         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 896         if (ret)
 897                 goto out;
 898
 899         if (conn_param)
 900                 qp_attr.max_rd_atomic = conn_param->initiator_depth;
 901         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
 902 out:
 903         mutex_unlock(&id_priv->qp_mutex);
 904         return ret;
 905 }
 906
 907 static int cma_modify_qp_err(struct rdma_id_private *id_priv)
 908 {
 909         struct ib_qp_attr qp_attr;
 910         int ret;
 911
 912         mutex_lock(&id_priv->qp_mutex);
 913         if (!id_priv->id.qp) {
 914                 ret = 0;
 915                 goto out;
 916         }
 917
 918         qp_attr.qp_state = IB_QPS_ERR;
 919         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, IB_QP_STATE);
 920 out:
 921         mutex_unlock(&id_priv->qp_mutex);
 922         return ret;
 923 }
 924
 925 static int cma_ib_init_qp_attr(struct rdma_id_private *id_priv,
 926                                struct ib_qp_attr *qp_attr, int *qp_attr_mask)
 927 {
 928         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
 929         int ret;
 930         u16 pkey;
 931
 932         if (rdma_cap_eth_ah(id_priv->id.device, id_priv->id.port_num))
 933                 pkey = 0xffff;
 934         else
 935                 pkey = ib_addr_get_pkey(dev_addr);
 936
 937         ret = ib_find_cached_pkey(id_priv->id.device, id_priv->id.port_num,
 938                                   pkey, &qp_attr->pkey_index);
 939         if (ret)
 940                 return ret;
 941
 942         qp_attr->port_num = id_priv->id.port_num;
 943         *qp_attr_mask = IB_QP_STATE | IB_QP_PKEY_INDEX | IB_QP_PORT;
 944
 945         if (id_priv->id.qp_type == IB_QPT_UD) {
 946                 ret = cma_set_qkey(id_priv, 0);
 947                 if (ret)
 948                         return ret;
 949
 950                 qp_attr->qkey = id_priv->qkey;
 951                 *qp_attr_mask |= IB_QP_QKEY;
 952         } else {
 953                 qp_attr->qp_access_flags = 0;
 954                 *qp_attr_mask |= IB_QP_ACCESS_FLAGS;
 955         }
 956         return 0;
 957 }
 958
 959 int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
 960                        int *qp_attr_mask)
 961 {
 962         struct rdma_id_private *id_priv;
 963         int ret = 0;
 964
 965         id_priv = container_of(id, struct rdma_id_private, id);
 966         if (rdma_cap_ib_cm(id->device, id->port_num)) {
 967                 if (!id_priv->cm_id.ib || (id_priv->id.qp_type == IB_QPT_UD))
 968                         ret = cma_ib_init_qp_attr(id_priv, qp_attr, qp_attr_mask);
 969                 else
 970                         ret = ib_cm_init_qp_attr(id_priv->cm_id.ib, qp_attr,
 971                                                  qp_attr_mask);
 972
 973                 if (qp_attr->qp_state == IB_QPS_RTR)
 974                         qp_attr->rq_psn = id_priv->seq_num;
 975         } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
 976                 if (!id_priv->cm_id.iw) {
 977                         qp_attr->qp_access_flags = 0;
 978                         *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS;
 979                 } else
 980                         ret = iw_cm_init_qp_attr(id_priv->cm_id.iw, qp_attr,
 981                                                  qp_attr_mask);
 982                 qp_attr->port_num = id_priv->id.port_num;
 983                 *qp_attr_mask |= IB_QP_PORT;
 984         } else
 985                 ret = -ENOSYS;
 986
 987         return ret;
 988 }
 989 EXPORT_SYMBOL(rdma_init_qp_attr);
 990
 991 static inline int cma_zero_addr(struct sockaddr *addr)
 992 {
 993         switch (addr->sa_family) {
 994         case AF_INET:
 995                 return ipv4_is_zeronet(((struct sockaddr_in *)addr)->sin_addr.s_addr);
 996         case AF_INET6:
 997                 return ipv6_addr_any(&((struct sockaddr_in6 *) addr)->sin6_addr);
 998         case AF_IB:
 999                 return ib_addr_any(&((struct sockaddr_ib *) addr)->sib_addr);
1000         default:
1001                 return 0;
1002         }
1003 }
1004
1005 static inline int cma_loopback_addr(struct sockaddr *addr)
1006 {
1007         switch (addr->sa_family) {
1008         case AF_INET:
1009                 return ipv4_is_loopback(((struct sockaddr_in *) addr)->sin_addr.s_addr);
1010         case AF_INET6:
1011                 return ipv6_addr_loopback(&((struct sockaddr_in6 *) addr)->sin6_addr);
1012         case AF_IB:
1013                 return ib_addr_loopback(&((struct sockaddr_ib *) addr)->sib_addr);
1014         default:
1015                 return 0;
1016         }
1017 }
1018
1019 static inline int cma_any_addr(struct sockaddr *addr)
1020 {
1021         return cma_zero_addr(addr) || cma_loopback_addr(addr);
1022 }
1023
1024 static int cma_addr_cmp(struct sockaddr *src, struct sockaddr *dst)
1025 {
1026         if (src->sa_family != dst->sa_family)
1027                 return -1;
1028
1029         switch (src->sa_family) {
1030         case AF_INET:
1031                 return ((struct sockaddr_in *) src)->sin_addr.s_addr !=
1032                        ((struct sockaddr_in *) dst)->sin_addr.s_addr;
1033         case AF_INET6:
1034                 return ipv6_addr_cmp(&((struct sockaddr_in6 *) src)->sin6_addr,
1035                                      &((struct sockaddr_in6 *) dst)->sin6_addr);
1036         default:
1037                 return ib_addr_cmp(&((struct sockaddr_ib *) src)->sib_addr,
1038                                    &((struct sockaddr_ib *) dst)->sib_addr);
1039         }
1040 }
1041
1042 static __be16 cma_port(struct sockaddr *addr)
1043 {
1044         struct sockaddr_ib *sib;
1045
1046         switch (addr->sa_family) {
1047         case AF_INET:
1048                 return ((struct sockaddr_in *) addr)->sin_port;
1049         case AF_INET6:
1050                 return ((struct sockaddr_in6 *) addr)->sin6_port;
1051         case AF_IB:
1052                 sib = (struct sockaddr_ib *) addr;
1053                 return htons((u16) (be64_to_cpu(sib->sib_sid) &
1054                                     be64_to_cpu(sib->sib_sid_mask)));
1055         default:
1056                 return 0;
1057         }
1058 }
1059
1060 static inline int cma_any_port(struct sockaddr *addr)
1061 {
1062         return !cma_port(addr);
1063 }
1064
1065 static void cma_save_ib_info(struct sockaddr *src_addr,
1066                              struct sockaddr *dst_addr,
1067                              struct rdma_cm_id *listen_id,
1068                              struct ib_sa_path_rec *path)
1069 {
1070         struct sockaddr_ib *listen_ib, *ib;
1071
1072         listen_ib = (struct sockaddr_ib *) &listen_id->route.addr.src_addr;
1073         if (src_addr) {
1074                 ib = (struct sockaddr_ib *)src_addr;
1075                 ib->sib_family = AF_IB;
1076                 if (path) {
1077                         ib->sib_pkey = path->pkey;
1078                         ib->sib_flowinfo = path->flow_label;
1079                         memcpy(&ib->sib_addr, &path->sgid, 16);
1080                         ib->sib_sid = path->service_id;
1081                         ib->sib_scope_id = 0;
1082                 } else {
1083                         ib->sib_pkey = listen_ib->sib_pkey;
1084                         ib->sib_flowinfo = listen_ib->sib_flowinfo;
1085                         ib->sib_addr = listen_ib->sib_addr;
1086                         ib->sib_sid = listen_ib->sib_sid;
1087                         ib->sib_scope_id = listen_ib->sib_scope_id;
1088                 }
1089                 ib->sib_sid_mask = cpu_to_be64(0xffffffffffffffffULL);
1090         }
1091         if (dst_addr) {
1092                 ib = (struct sockaddr_ib *)dst_addr;
1093                 ib->sib_family = AF_IB;
1094                 if (path) {
1095                         ib->sib_pkey = path->pkey;
1096                         ib->sib_flowinfo = path->flow_label;
1097                         memcpy(&ib->sib_addr, &path->dgid, 16);
1098                 }
1099         }
1100 }
1101
1102 static void cma_save_ip4_info(struct sockaddr_in *src_addr,
1103                               struct sockaddr_in *dst_addr,
1104                               struct cma_hdr *hdr,
1105                               __be16 local_port)
1106 {
1107         if (src_addr) {
1108                 *src_addr = (struct sockaddr_in) {
1109                         .sin_family = AF_INET,
1110                         .sin_addr.s_addr = hdr->dst_addr.ip4.addr,
1111                         .sin_port = local_port,
1112                 };
1113         }
1114
1115         if (dst_addr) {
1116                 *dst_addr = (struct sockaddr_in) {
1117                         .sin_family = AF_INET,
1118                         .sin_addr.s_addr = hdr->src_addr.ip4.addr,
1119                         .sin_port = hdr->port,
1120                 };
1121         }
1122 }
1123
1124 static void cma_save_ip6_info(struct sockaddr_in6 *src_addr,
1125                               struct sockaddr_in6 *dst_addr,
1126                               struct cma_hdr *hdr,
1127                               __be16 local_port)
1128 {
1129         if (src_addr) {
1130                 *src_addr = (struct sockaddr_in6) {
1131                         .sin6_family = AF_INET6,
1132                         .sin6_addr = hdr->dst_addr.ip6,
1133                         .sin6_port = local_port,
1134                 };
1135         }
1136
1137         if (dst_addr) {
1138                 *dst_addr = (struct sockaddr_in6) {
1139                         .sin6_family = AF_INET6,
1140                         .sin6_addr = hdr->src_addr.ip6,
1141                         .sin6_port = hdr->port,
1142                 };
1143         }
1144 }
1145
1146 static u16 cma_port_from_service_id(__be64 service_id)
1147 {
1148         return (u16)be64_to_cpu(service_id);
1149 }
1150
1151 static int cma_save_ip_info(struct sockaddr *src_addr,
1152                             struct sockaddr *dst_addr,
1153                             struct ib_cm_event *ib_event,
1154                             __be64 service_id)
1155 {
1156         struct cma_hdr *hdr;
1157         __be16 port;
1158
1159         hdr = ib_event->private_data;
1160         if (hdr->cma_version != CMA_VERSION)
1161                 return -EINVAL;
1162
1163         port = htons(cma_port_from_service_id(service_id));
1164
1165         switch (cma_get_ip_ver(hdr)) {
1166         case 4:
1167                 cma_save_ip4_info((struct sockaddr_in *)src_addr,
1168                                   (struct sockaddr_in *)dst_addr, hdr, port);
1169                 break;
1170         case 6:
1171                 cma_save_ip6_info((struct sockaddr_in6 *)src_addr,
1172                                   (struct sockaddr_in6 *)dst_addr, hdr, port);
1173                 break;
1174         default:
1175                 return -EAFNOSUPPORT;
1176         }
1177
1178         return 0;
1179 }
1180
1181 static int cma_save_net_info(struct sockaddr *src_addr,
1182                              struct sockaddr *dst_addr,
1183                              struct rdma_cm_id *listen_id,
1184                              struct ib_cm_event *ib_event,
1185                              sa_family_t sa_family, __be64 service_id)
1186 {
1187         if (sa_family == AF_IB) {
1188                 if (ib_event->event == IB_CM_REQ_RECEIVED)
1189                         cma_save_ib_info(src_addr, dst_addr, listen_id,
1190                                          ib_event->param.req_rcvd.primary_path);
1191                 else if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED)
1192                         cma_save_ib_info(src_addr, dst_addr, listen_id, NULL);
1193                 return 0;
1194         }
1195
1196         return cma_save_ip_info(src_addr, dst_addr, ib_event, service_id);
1197 }
1198
1199 static int cma_save_req_info(const struct ib_cm_event *ib_event,
1200                              struct cma_req_info *req)
1201 {
1202         const struct ib_cm_req_event_param *req_param =
1203                 &ib_event->param.req_rcvd;
1204         const struct ib_cm_sidr_req_event_param *sidr_param =
1205                 &ib_event->param.sidr_req_rcvd;
1206
1207         switch (ib_event->event) {
1208         case IB_CM_REQ_RECEIVED:
1209                 req->device     = req_param->listen_id->device;
1210                 req->port       = req_param->port;
1211                 memcpy(&req->local_gid, &req_param->primary_path->sgid,
1212                        sizeof(req->local_gid));
1213                 req->has_gid    = true;
1214                 req->service_id = req_param->primary_path->service_id;
1215                 req->pkey       = be16_to_cpu(req_param->primary_path->pkey);
1216                 if (req->pkey != req_param->bth_pkey)
1217                         pr_warn_ratelimited("RDMA CMA: got different BTH P_Key (0x%x) and primary path P_Key (0x%x)\n"
1218                                             "RDMA CMA: in the future this may cause the request to be dropped\n",
1219                                             req_param->bth_pkey, req->pkey);
1220                 break;
1221         case IB_CM_SIDR_REQ_RECEIVED:
1222                 req->device     = sidr_param->listen_id->device;
1223                 req->port       = sidr_param->port;
1224                 req->has_gid    = false;
1225                 req->service_id = sidr_param->service_id;
1226                 req->pkey       = sidr_param->pkey;
1227                 if (req->pkey != sidr_param->bth_pkey)
1228                         pr_warn_ratelimited("RDMA CMA: got different BTH P_Key (0x%x) and SIDR request payload P_Key (0x%x)\n"
1229                                             "RDMA CMA: in the future this may cause the request to be dropped\n",
1230                                             sidr_param->bth_pkey, req->pkey);
1231                 break;
1232         default:
1233                 return -EINVAL;
1234         }
1235
1236         return 0;
1237 }
1238
1239 static bool validate_ipv4_net_dev(struct net_device *net_dev,
1240                                   const struct sockaddr_in *dst_addr,
1241                                   const struct sockaddr_in *src_addr)
1242 {
1243         __be32 daddr = dst_addr->sin_addr.s_addr,
1244                saddr = src_addr->sin_addr.s_addr;
1245         struct fib_result res;
1246         struct flowi4 fl4;
1247         int err;
1248         bool ret;
1249
1250         if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) ||
1251             ipv4_is_lbcast(daddr) || ipv4_is_zeronet(saddr) ||
1252             ipv4_is_zeronet(daddr) || ipv4_is_loopback(daddr) ||
1253             ipv4_is_loopback(saddr))
1254                 return false;
1255
1256         memset(&fl4, 0, sizeof(fl4));
1257         fl4.flowi4_iif = net_dev->ifindex;
1258         fl4.daddr = daddr;
1259         fl4.saddr = saddr;
1260
1261         rcu_read_lock();
1262         err = fib_lookup(dev_net(net_dev), &fl4, &res, 0);
1263         ret = err == 0 && FIB_RES_DEV(res) == net_dev;
1264         rcu_read_unlock();
1265
1266         return ret;
1267 }
1268
1269 static bool validate_ipv6_net_dev(struct net_device *net_dev,
1270                                   const struct sockaddr_in6 *dst_addr,
1271                                   const struct sockaddr_in6 *src_addr)
1272 {
1273 #if IS_ENABLED(CONFIG_IPV6)
1274         const int strict = ipv6_addr_type(&dst_addr->sin6_addr) &
1275                            IPV6_ADDR_LINKLOCAL;
1276         struct rt6_info *rt = rt6_lookup(dev_net(net_dev), &dst_addr->sin6_addr,
1277                                          &src_addr->sin6_addr, net_dev->ifindex,
1278                                          strict);
1279         bool ret;
1280
1281         if (!rt)
1282                 return false;
1283
1284         ret = rt->rt6i_idev->dev == net_dev;
1285         ip6_rt_put(rt);
1286
1287         return ret;
1288 #else
1289         return false;
1290 #endif
1291 }
1292
1293 static bool validate_net_dev(struct net_device *net_dev,
1294                              const struct sockaddr *daddr,
1295                              const struct sockaddr *saddr)
1296 {
1297         const struct sockaddr_in *daddr4 = (const struct sockaddr_in *)daddr;
1298         const struct sockaddr_in *saddr4 = (const struct sockaddr_in *)saddr;
1299         const struct sockaddr_in6 *daddr6 = (const struct sockaddr_in6 *)daddr;
1300         const struct sockaddr_in6 *saddr6 = (const struct sockaddr_in6 *)saddr;
1301
1302         switch (daddr->sa_family) {
1303         case AF_INET:
1304                 return saddr->sa_family == AF_INET &&
1305                        validate_ipv4_net_dev(net_dev, daddr4, saddr4);
1306
1307         case AF_INET6:
1308                 return saddr->sa_family == AF_INET6 &&
1309                        validate_ipv6_net_dev(net_dev, daddr6, saddr6);
1310
1311         default:
1312                 return false;
1313         }
1314 }
1315
1316 static struct net_device *cma_get_net_dev(struct ib_cm_event *ib_event,
1317                                           const struct cma_req_info *req)
1318 {
1319         struct sockaddr_storage listen_addr_storage, src_addr_storage;
1320         struct sockaddr *listen_addr = (struct sockaddr *)&listen_addr_storage,
1321                         *src_addr = (struct sockaddr *)&src_addr_storage;
1322         struct net_device *net_dev;
1323         const union ib_gid *gid = req->has_gid ? &req->local_gid : NULL;
1324         int err;
1325
1326         err = cma_save_ip_info(listen_addr, src_addr, ib_event,
1327                                req->service_id);
1328         if (err)
1329                 return ERR_PTR(err);
1330
1331         net_dev = ib_get_net_dev_by_params(req->device, req->port, req->pkey,
1332                                            gid, listen_addr);
1333         if (!net_dev)
1334                 return ERR_PTR(-ENODEV);
1335
1336         if (!validate_net_dev(net_dev, listen_addr, src_addr)) {
1337                 dev_put(net_dev);
1338                 return ERR_PTR(-EHOSTUNREACH);
1339         }
1340
1341         return net_dev;
1342 }
1343
1344 static enum rdma_port_space rdma_ps_from_service_id(__be64 service_id)
1345 {
1346         return (be64_to_cpu(service_id) >> 16) & 0xffff;
1347 }
1348
1349 static bool cma_match_private_data(struct rdma_id_private *id_priv,
1350                                    const struct cma_hdr *hdr)
1351 {
1352         struct sockaddr *addr = cma_src_addr(id_priv);
1353         __be32 ip4_addr;
1354         struct in6_addr ip6_addr;
1355
1356         if (cma_any_addr(addr) && !id_priv->afonly)
1357                 return true;
1358
1359         switch (addr->sa_family) {
1360         case AF_INET:
1361                 ip4_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
1362                 if (cma_get_ip_ver(hdr) != 4)
1363                         return false;
1364                 if (!cma_any_addr(addr) &&
1365                     hdr->dst_addr.ip4.addr != ip4_addr)
1366                         return false;
1367                 break;
1368         case AF_INET6:
1369                 ip6_addr = ((struct sockaddr_in6 *)addr)->sin6_addr;
1370                 if (cma_get_ip_ver(hdr) != 6)
1371                         return false;
1372                 if (!cma_any_addr(addr) &&
1373                     memcmp(&hdr->dst_addr.ip6, &ip6_addr, sizeof(ip6_addr)))
1374                         return false;
1375                 break;
1376         case AF_IB:
1377                 return true;
1378         default:
1379                 return false;
1380         }
1381
1382         return true;
1383 }
1384
1385 static bool cma_protocol_roce_dev_port(struct ib_device *device, int port_num)
1386 {
1387         enum rdma_link_layer ll = rdma_port_get_link_layer(device, port_num);
1388         enum rdma_transport_type transport =
1389                 rdma_node_get_transport(device->node_type);
1390
1391         return ll == IB_LINK_LAYER_ETHERNET && transport == RDMA_TRANSPORT_IB;
1392 }
1393
1394 static bool cma_protocol_roce(const struct rdma_cm_id *id)
1395 {
1396         struct ib_device *device = id->device;
1397         const int port_num = id->port_num ?: rdma_start_port(device);
1398
1399         return cma_protocol_roce_dev_port(device, port_num);
1400 }
1401
1402 static bool cma_match_net_dev(const struct rdma_cm_id *id,
1403                               const struct net_device *net_dev,
1404                               u8 port_num)
1405 {
1406         const struct rdma_addr *addr = &id->route.addr;
1407
1408         if (!net_dev)
1409                 /* This request is an AF_IB request or a RoCE request */
1410                 return (!id->port_num || id->port_num == port_num) &&
1411                        (addr->src_addr.ss_family == AF_IB ||
1412                         cma_protocol_roce_dev_port(id->device, port_num));
1413
1414         /*
1415          * Net namespaces must match, and if the listner is listening
1416          * on a specific netdevice than netdevice must match as well.
1417          */
1418         if (net_eq(dev_net(net_dev), addr->dev_addr.net) &&
1419             (!!addr->dev_addr.bound_dev_if ==
1420              (addr->dev_addr.bound_dev_if == net_dev->ifindex)))
1421                 return true;
1422         else
1423                 return false;
1424 }
1425
1426 static struct rdma_id_private *cma_find_listener(
1427                 const struct rdma_bind_list *bind_list,
1428                 const struct ib_cm_id *cm_id,
1429                 const struct ib_cm_event *ib_event,
1430                 const struct cma_req_info *req,
1431                 const struct net_device *net_dev)
1432 {
1433         struct rdma_id_private *id_priv, *id_priv_dev;
1434
1435         if (!bind_list)
1436                 return ERR_PTR(-EINVAL);
1437
1438         hlist_for_each_entry(id_priv, &bind_list->owners, node) {
1439                 if (cma_match_private_data(id_priv, ib_event->private_data)) {
1440                         if (id_priv->id.device == cm_id->device &&
1441                             cma_match_net_dev(&id_priv->id, net_dev, req->port))
1442                                 return id_priv;
1443                         list_for_each_entry(id_priv_dev,
1444                                             &id_priv->listen_list,
1445                                             listen_list) {
1446                                 if (id_priv_dev->id.device == cm_id->device &&
1447                                     cma_match_net_dev(&id_priv_dev->id, net_dev, req->port))
1448                                         return id_priv_dev;
1449                         }
1450                 }
1451         }
1452
1453         return ERR_PTR(-EINVAL);
1454 }
1455
1456 static struct rdma_id_private *cma_id_from_event(struct ib_cm_id *cm_id,
1457                                                  struct ib_cm_event *ib_event,
1458                                                  struct net_device **net_dev)
1459 {
1460         struct cma_req_info req;
1461         struct rdma_bind_list *bind_list;
1462         struct rdma_id_private *id_priv;
1463         int err;
1464
1465         err = cma_save_req_info(ib_event, &req);
1466         if (err)
1467                 return ERR_PTR(err);
1468
1469         *net_dev = cma_get_net_dev(ib_event, &req);
1470         if (IS_ERR(*net_dev)) {
1471                 if (PTR_ERR(*net_dev) == -EAFNOSUPPORT) {
1472                         /* Assuming the protocol is AF_IB */
1473                         *net_dev = NULL;
1474                 } else if (cma_protocol_roce_dev_port(req.device, req.port)) {
1475                         /* TODO find the net dev matching the request parameters
1476                          * through the RoCE GID table */
1477                         *net_dev = NULL;
1478                 } else {
1479                         return ERR_CAST(*net_dev);
1480                 }
1481         }
1482
1483         bind_list = cma_ps_find(*net_dev ? dev_net(*net_dev) : &init_net,
1484                                 rdma_ps_from_service_id(req.service_id),
1485                                 cma_port_from_service_id(req.service_id));
1486         id_priv = cma_find_listener(bind_list, cm_id, ib_event, &req, *net_dev);
1487         if (IS_ERR(id_priv) && *net_dev) {
1488                 dev_put(*net_dev);
1489                 *net_dev = NULL;
1490         }
1491
1492         return id_priv;
1493 }
1494
1495 static inline u8 cma_user_data_offset(struct rdma_id_private *id_priv)
1496 {
1497         return cma_family(id_priv) == AF_IB ? 0 : sizeof(struct cma_hdr);
1498 }
1499
1500 static void cma_cancel_route(struct rdma_id_private *id_priv)
1501 {
1502         if (rdma_cap_ib_sa(id_priv->id.device, id_priv->id.port_num)) {
1503                 if (id_priv->query)
1504                         ib_sa_cancel_query(id_priv->query_id, id_priv->query);
1505         }
1506 }
1507
1508 static void cma_cancel_listens(struct rdma_id_private *id_priv)
1509 {
1510         struct rdma_id_private *dev_id_priv;
1511
1512         /*
1513          * Remove from listen_any_list to prevent added devices from spawning
1514          * additional listen requests.
1515          */
1516         mutex_lock(&lock);
1517         list_del(&id_priv->list);
1518
1519         while (!list_empty(&id_priv->listen_list)) {
1520                 dev_id_priv = list_entry(id_priv->listen_list.next,
1521                                          struct rdma_id_private, listen_list);
1522                 /* sync with device removal to avoid duplicate destruction */
1523                 list_del_init(&dev_id_priv->list);
1524                 list_del(&dev_id_priv->listen_list);
1525                 mutex_unlock(&lock);
1526
1527                 rdma_destroy_id(&dev_id_priv->id);
1528                 mutex_lock(&lock);
1529         }
1530         mutex_unlock(&lock);
1531 }
1532
1533 static void cma_cancel_operation(struct rdma_id_private *id_priv,
1534                                  enum rdma_cm_state state)
1535 {
1536         switch (state) {
1537         case RDMA_CM_ADDR_QUERY:
1538                 rdma_addr_cancel(&id_priv->id.route.addr.dev_addr);
1539                 break;
1540         case RDMA_CM_ROUTE_QUERY:
1541                 cma_cancel_route(id_priv);
1542                 break;
1543         case RDMA_CM_LISTEN:
1544                 if (cma_any_addr(cma_src_addr(id_priv)) && !id_priv->cma_dev)
1545                         cma_cancel_listens(id_priv);
1546                 break;
1547         default:
1548                 break;
1549         }
1550 }
1551
1552 static void cma_release_port(struct rdma_id_private *id_priv)
1553 {
1554         struct rdma_bind_list *bind_list = id_priv->bind_list;
1555         struct net *net = id_priv->id.route.addr.dev_addr.net;
1556
1557         if (!bind_list)
1558                 return;
1559
1560         mutex_lock(&lock);
1561         hlist_del(&id_priv->node);
1562         if (hlist_empty(&bind_list->owners)) {
1563                 cma_ps_remove(net, bind_list->ps, bind_list->port);
1564                 kfree(bind_list);
1565         }
1566         mutex_unlock(&lock);
1567 }
1568
1569 static void cma_leave_mc_groups(struct rdma_id_private *id_priv)
1570 {
1571         struct cma_multicast *mc;
1572
1573         while (!list_empty(&id_priv->mc_list)) {
1574                 mc = container_of(id_priv->mc_list.next,
1575                                   struct cma_multicast, list);
1576                 list_del(&mc->list);
1577                 if (rdma_cap_ib_mcast(id_priv->cma_dev->device,
1578                                       id_priv->id.port_num)) {
1579                         ib_sa_free_multicast(mc->multicast.ib);
1580                         kfree(mc);
1581                 } else {
1582                         if (mc->igmp_joined) {
1583                                 struct rdma_dev_addr *dev_addr =
1584                                         &id_priv->id.route.addr.dev_addr;
1585                                 struct net_device *ndev = NULL;
1586
1587                                 if (dev_addr->bound_dev_if)
1588                                         ndev = dev_get_by_index(&init_net,
1589                                                                 dev_addr->bound_dev_if);
1590                                 if (ndev) {
1591                                         cma_igmp_send(ndev,
1592                                                       &mc->multicast.ib->rec.mgid,
1593                                                       false);
1594                                         dev_put(ndev);
1595                                 }
1596                         }
1597                         kref_put(&mc->mcref, release_mc);
1598                 }
1599         }
1600 }
1601
1602 void rdma_destroy_id(struct rdma_cm_id *id)
1603 {
1604         struct rdma_id_private *id_priv;
1605         enum rdma_cm_state state;
1606
1607         id_priv = container_of(id, struct rdma_id_private, id);
1608         state = cma_exch(id_priv, RDMA_CM_DESTROYING);
1609         cma_cancel_operation(id_priv, state);
1610
1611         /*
1612          * Wait for any active callback to finish.  New callbacks will find
1613          * the id_priv state set to destroying and abort.
1614          */
1615         mutex_lock(&id_priv->handler_mutex);
1616         mutex_unlock(&id_priv->handler_mutex);
1617
1618         if (id_priv->cma_dev) {
1619                 if (rdma_cap_ib_cm(id_priv->id.device, 1)) {
1620                         if (id_priv->cm_id.ib)
1621                                 ib_destroy_cm_id(id_priv->cm_id.ib);
1622                 } else if (rdma_cap_iw_cm(id_priv->id.device, 1)) {
1623                         if (id_priv->cm_id.iw)
1624                                 iw_destroy_cm_id(id_priv->cm_id.iw);
1625                 }
1626                 cma_leave_mc_groups(id_priv);
1627                 cma_release_dev(id_priv);
1628         }
1629
1630         cma_release_port(id_priv);
1631         cma_deref_id(id_priv);
1632         wait_for_completion(&id_priv->comp);
1633
1634         if (id_priv->internal_id)
1635                 cma_deref_id(id_priv->id.context);
1636
1637         kfree(id_priv->id.route.path_rec);
1638         put_net(id_priv->id.route.addr.dev_addr.net);
1639         kfree(id_priv);
1640 }
1641 EXPORT_SYMBOL(rdma_destroy_id);
1642
1643 static int cma_rep_recv(struct rdma_id_private *id_priv)
1644 {
1645         int ret;
1646
1647         ret = cma_modify_qp_rtr(id_priv, NULL);
1648         if (ret)
1649                 goto reject;
1650
1651         ret = cma_modify_qp_rts(id_priv, NULL);
1652         if (ret)
1653                 goto reject;
1654
1655         ret = ib_send_cm_rtu(id_priv->cm_id.ib, NULL, 0);
1656         if (ret)
1657                 goto reject;
1658
1659         return 0;
1660 reject:
1661         cma_modify_qp_err(id_priv);
1662         ib_send_cm_rej(id_priv->cm_id.ib, IB_CM_REJ_CONSUMER_DEFINED,
1663                        NULL, 0, NULL, 0);
1664         return ret;
1665 }
1666
1667 static void cma_set_rep_event_data(struct rdma_cm_event *event,
1668                                    struct ib_cm_rep_event_param *rep_data,
1669                                    void *private_data)
1670 {
1671         event->param.conn.private_data = private_data;
1672         event->param.conn.private_data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
1673         event->param.conn.responder_resources = rep_data->responder_resources;
1674         event->param.conn.initiator_depth = rep_data->initiator_depth;
1675         event->param.conn.flow_control = rep_data->flow_control;
1676         event->param.conn.rnr_retry_count = rep_data->rnr_retry_count;
1677         event->param.conn.srq = rep_data->srq;
1678         event->param.conn.qp_num = rep_data->remote_qpn;
1679 }
1680
1681 static int cma_ib_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
1682 {
1683         struct rdma_id_private *id_priv = cm_id->context;
1684         struct rdma_cm_event event;
1685         int ret = 0;
1686
1687         mutex_lock(&id_priv->handler_mutex);
1688         if ((ib_event->event != IB_CM_TIMEWAIT_EXIT &&
1689              id_priv->state != RDMA_CM_CONNECT) ||
1690             (ib_event->event == IB_CM_TIMEWAIT_EXIT &&
1691              id_priv->state != RDMA_CM_DISCONNECT))
1692                 goto out;
1693
1694         memset(&event, 0, sizeof event);
1695         switch (ib_event->event) {
1696         case IB_CM_REQ_ERROR:
1697         case IB_CM_REP_ERROR:
1698                 event.event = RDMA_CM_EVENT_UNREACHABLE;
1699                 event.status = -ETIMEDOUT;
1700                 break;
1701         case IB_CM_REP_RECEIVED:
1702                 if (id_priv->id.qp) {
1703                         event.status = cma_rep_recv(id_priv);
1704                         event.event = event.status ? RDMA_CM_EVENT_CONNECT_ERROR :
1705                                                      RDMA_CM_EVENT_ESTABLISHED;
1706                 } else {
1707                         event.event = RDMA_CM_EVENT_CONNECT_RESPONSE;
1708                 }
1709                 cma_set_rep_event_data(&event, &ib_event->param.rep_rcvd,
1710                                        ib_event->private_data);
1711                 break;
1712         case IB_CM_RTU_RECEIVED:
1713         case IB_CM_USER_ESTABLISHED:
1714                 event.event = RDMA_CM_EVENT_ESTABLISHED;
1715                 break;
1716         case IB_CM_DREQ_ERROR:
1717                 event.status = -ETIMEDOUT; /* fall through */
1718         case IB_CM_DREQ_RECEIVED:
1719         case IB_CM_DREP_RECEIVED:
1720                 if (!cma_comp_exch(id_priv, RDMA_CM_CONNECT,
1721                                    RDMA_CM_DISCONNECT))
1722                         goto out;
1723                 event.event = RDMA_CM_EVENT_DISCONNECTED;
1724                 break;
1725         case IB_CM_TIMEWAIT_EXIT:
1726                 event.event = RDMA_CM_EVENT_TIMEWAIT_EXIT;
1727                 break;
1728         case IB_CM_MRA_RECEIVED:
1729                 /* ignore event */
1730                 goto out;
1731         case IB_CM_REJ_RECEIVED:
1732                 cma_modify_qp_err(id_priv);
1733                 event.status = ib_event->param.rej_rcvd.reason;
1734                 event.event = RDMA_CM_EVENT_REJECTED;
1735                 event.param.conn.private_data = ib_event->private_data;
1736                 event.param.conn.private_data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
1737                 break;
1738         default:
1739                 pr_err("RDMA CMA: unexpected IB CM event: %d\n",
1740                        ib_event->event);
1741                 goto out;
1742         }
1743
1744         ret = id_priv->id.event_handler(&id_priv->id, &event);
1745         if (ret) {
1746                 /* Destroy the CM ID by returning a non-zero value. */
1747                 id_priv->cm_id.ib = NULL;
1748                 cma_exch(id_priv, RDMA_CM_DESTROYING);
1749                 mutex_unlock(&id_priv->handler_mutex);
1750                 rdma_destroy_id(&id_priv->id);
1751                 return ret;
1752         }
1753 out:
1754         mutex_unlock(&id_priv->handler_mutex);
1755         return ret;
1756 }
1757
1758 static struct rdma_id_private *cma_new_conn_id(struct rdma_cm_id *listen_id,
1759                                                struct ib_cm_event *ib_event,
1760                                                struct net_device *net_dev)
1761 {
1762         struct rdma_id_private *id_priv;
1763         struct rdma_cm_id *id;
1764         struct rdma_route *rt;
1765         const sa_family_t ss_family = listen_id->route.addr.src_addr.ss_family;
1766         const __be64 service_id =
1767                       ib_event->param.req_rcvd.primary_path->service_id;
1768         int ret;
1769
1770         id = rdma_create_id(listen_id->route.addr.dev_addr.net,
1771                             listen_id->event_handler, listen_id->context,
1772                             listen_id->ps, ib_event->param.req_rcvd.qp_type);
1773         if (IS_ERR(id))
1774                 return NULL;
1775
1776         id_priv = container_of(id, struct rdma_id_private, id);
1777         if (cma_save_net_info((struct sockaddr *)&id->route.addr.src_addr,
1778                               (struct sockaddr *)&id->route.addr.dst_addr,
1779                               listen_id, ib_event, ss_family, service_id))
1780                 goto err;
1781
1782         rt = &id->route;
1783         rt->num_paths = ib_event->param.req_rcvd.alternate_path ? 2 : 1;
1784         rt->path_rec = kmalloc(sizeof *rt->path_rec * rt->num_paths,
1785                                GFP_KERNEL);
1786         if (!rt->path_rec)
1787                 goto err;
1788
1789         rt->path_rec[0] = *ib_event->param.req_rcvd.primary_path;
1790         if (rt->num_paths == 2)
1791                 rt->path_rec[1] = *ib_event->param.req_rcvd.alternate_path;
1792
1793         if (net_dev) {
1794                 ret = rdma_copy_addr(&rt->addr.dev_addr, net_dev, NULL);
1795                 if (ret)
1796                         goto err;
1797         } else {
1798                 if (!cma_protocol_roce(listen_id) &&
1799                     cma_any_addr(cma_src_addr(id_priv))) {
1800                         rt->addr.dev_addr.dev_type = ARPHRD_INFINIBAND;
1801                         rdma_addr_set_sgid(&rt->addr.dev_addr, &rt->path_rec[0].sgid);
1802                         ib_addr_set_pkey(&rt->addr.dev_addr, be16_to_cpu(rt->path_rec[0].pkey));
1803                 } else if (!cma_any_addr(cma_src_addr(id_priv))) {
1804                         ret = cma_translate_addr(cma_src_addr(id_priv), &rt->addr.dev_addr);
1805                         if (ret)
1806                                 goto err;
1807                 }
1808         }
1809         rdma_addr_set_dgid(&rt->addr.dev_addr, &rt->path_rec[0].dgid);
1810
1811         id_priv->state = RDMA_CM_CONNECT;
1812         return id_priv;
1813
1814 err:
1815         rdma_destroy_id(id);
1816         return NULL;
1817 }
1818
1819 static struct rdma_id_private *cma_new_udp_id(struct rdma_cm_id *listen_id,
1820                                               struct ib_cm_event *ib_event,
1821                                               struct net_device *net_dev)
1822 {
1823         struct rdma_id_private *id_priv;
1824         struct rdma_cm_id *id;
1825         const sa_family_t ss_family = listen_id->route.addr.src_addr.ss_family;
1826         struct net *net = listen_id->route.addr.dev_addr.net;
1827         int ret;
1828
1829         id = rdma_create_id(net, listen_id->event_handler, listen_id->context,
1830                             listen_id->ps, IB_QPT_UD);
1831         if (IS_ERR(id))
1832                 return NULL;
1833
1834         id_priv = container_of(id, struct rdma_id_private, id);
1835         if (cma_save_net_info((struct sockaddr *)&id->route.addr.src_addr,
1836                               (struct sockaddr *)&id->route.addr.dst_addr,
1837                               listen_id, ib_event, ss_family,
1838                               ib_event->param.sidr_req_rcvd.service_id))
1839                 goto err;
1840
1841         if (net_dev) {
1842                 ret = rdma_copy_addr(&id->route.addr.dev_addr, net_dev, NULL);
1843                 if (ret)
1844                         goto err;
1845         } else {
1846                 if (!cma_any_addr(cma_src_addr(id_priv))) {
1847                         ret = cma_translate_addr(cma_src_addr(id_priv),
1848                                                  &id->route.addr.dev_addr);
1849                         if (ret)
1850                                 goto err;
1851                 }
1852         }
1853
1854         id_priv->state = RDMA_CM_CONNECT;
1855         return id_priv;
1856 err:
1857         rdma_destroy_id(id);
1858         return NULL;
1859 }
1860
1861 static void cma_set_req_event_data(struct rdma_cm_event *event,
1862                                    struct ib_cm_req_event_param *req_data,
1863                                    void *private_data, int offset)
1864 {
1865         event->param.conn.private_data = private_data + offset;
1866         event->param.conn.private_data_len = IB_CM_REQ_PRIVATE_DATA_SIZE - offset;
1867         event->param.conn.responder_resources = req_data->responder_resources;
1868         event->param.conn.initiator_depth = req_data->initiator_depth;
1869         event->param.conn.flow_control = req_data->flow_control;
1870         event->param.conn.retry_count = req_data->retry_count;
1871         event->param.conn.rnr_retry_count = req_data->rnr_retry_count;
1872         event->param.conn.srq = req_data->srq;
1873         event->param.conn.qp_num = req_data->remote_qpn;
1874 }
1875
1876 static int cma_check_req_qp_type(struct rdma_cm_id *id, struct ib_cm_event *ib_event)
1877 {
1878         return (((ib_event->event == IB_CM_REQ_RECEIVED) &&
1879                  (ib_event->param.req_rcvd.qp_type == id->qp_type)) ||
1880                 ((ib_event->event == IB_CM_SIDR_REQ_RECEIVED) &&
1881                  (id->qp_type == IB_QPT_UD)) ||
1882                 (!id->qp_type));
1883 }
1884
1885 static int cma_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
1886 {
1887         struct rdma_id_private *listen_id, *conn_id = NULL;
1888         struct rdma_cm_event event;
1889         struct net_device *net_dev;
1890         u8 offset;
1891         int ret;
1892
1893         listen_id = cma_id_from_event(cm_id, ib_event, &net_dev);
1894         if (IS_ERR(listen_id))
1895                 return PTR_ERR(listen_id);
1896
1897         if (!cma_check_req_qp_type(&listen_id->id, ib_event)) {
1898                 ret = -EINVAL;
1899                 goto net_dev_put;
1900         }
1901
1902         mutex_lock(&listen_id->handler_mutex);
1903         if (listen_id->state != RDMA_CM_LISTEN) {
1904                 ret = -ECONNABORTED;
1905                 goto err1;
1906         }
1907
1908         memset(&event, 0, sizeof event);
1909         offset = cma_user_data_offset(listen_id);
1910         event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
1911         if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED) {
1912                 conn_id = cma_new_udp_id(&listen_id->id, ib_event, net_dev);
1913                 event.param.ud.private_data = ib_event->private_data + offset;
1914                 event.param.ud.private_data_len =
1915                                 IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE - offset;
1916         } else {
1917                 conn_id = cma_new_conn_id(&listen_id->id, ib_event, net_dev);
1918                 cma_set_req_event_data(&event, &ib_event->param.req_rcvd,
1919                                        ib_event->private_data, offset);
1920         }
1921         if (!conn_id) {
1922                 ret = -ENOMEM;
1923                 goto err1;
1924         }
1925
1926         mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
1927         ret = cma_acquire_dev(conn_id, listen_id);
1928         if (ret)
1929                 goto err2;
1930
1931         conn_id->cm_id.ib = cm_id;
1932         cm_id->context = conn_id;
1933         cm_id->cm_handler = cma_ib_handler;
1934
1935         /*
1936          * Protect against the user destroying conn_id from another thread
1937          * until we're done accessing it.
1938          */
1939         atomic_inc(&conn_id->refcount);
1940         ret = conn_id->id.event_handler(&conn_id->id, &event);
1941         if (ret)
1942                 goto err3;
1943         /*
1944          * Acquire mutex to prevent user executing rdma_destroy_id()
1945          * while we're accessing the cm_id.
1946          */
1947         mutex_lock(&lock);
1948         if (cma_comp(conn_id, RDMA_CM_CONNECT) &&
1949             (conn_id->id.qp_type != IB_QPT_UD))
1950                 ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
1951         mutex_unlock(&lock);
1952         mutex_unlock(&conn_id->handler_mutex);
1953         mutex_unlock(&listen_id->handler_mutex);
1954         cma_deref_id(conn_id);
1955         if (net_dev)
1956                 dev_put(net_dev);
1957         return 0;
1958
1959 err3:
1960         cma_deref_id(conn_id);
1961         /* Destroy the CM ID by returning a non-zero value. */
1962         conn_id->cm_id.ib = NULL;
1963 err2:
1964         cma_exch(conn_id, RDMA_CM_DESTROYING);
1965         mutex_unlock(&conn_id->handler_mutex);
1966 err1:
1967         mutex_unlock(&listen_id->handler_mutex);
1968         if (conn_id)
1969                 rdma_destroy_id(&conn_id->id);
1970
1971 net_dev_put:
1972         if (net_dev)
1973                 dev_put(net_dev);
1974
1975         return ret;
1976 }
1977
1978 __be64 rdma_get_service_id(struct rdma_cm_id *id, struct sockaddr *addr)
1979 {
1980         if (addr->sa_family == AF_IB)
1981                 return ((struct sockaddr_ib *) addr)->sib_sid;
1982
1983         return cpu_to_be64(((u64)id->ps << 16) + be16_to_cpu(cma_port(addr)));
1984 }
1985 EXPORT_SYMBOL(rdma_get_service_id);
1986
1987 static int cma_iw_handler(struct iw_cm_id *iw_id, struct iw_cm_event *iw_event)
1988 {
1989         struct rdma_id_private *id_priv = iw_id->context;
1990         struct rdma_cm_event event;
1991         int ret = 0;
1992         struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr;
1993         struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr;
1994
1995         mutex_lock(&id_priv->handler_mutex);
1996         if (id_priv->state != RDMA_CM_CONNECT)
1997                 goto out;
1998
1999         memset(&event, 0, sizeof event);
2000         switch (iw_event->event) {
2001         case IW_CM_EVENT_CLOSE:
2002                 event.event = RDMA_CM_EVENT_DISCONNECTED;
2003                 break;
2004         case IW_CM_EVENT_CONNECT_REPLY:
2005                 memcpy(cma_src_addr(id_priv), laddr,
2006                        rdma_addr_size(laddr));
2007                 memcpy(cma_dst_addr(id_priv), raddr,
2008                        rdma_addr_size(raddr));
2009                 switch (iw_event->status) {
2010                 case 0:
2011                         event.event = RDMA_CM_EVENT_ESTABLISHED;
2012                         event.param.conn.initiator_depth = iw_event->ird;
2013                         event.param.conn.responder_resources = iw_event->ord;
2014                         break;
2015                 case -ECONNRESET:
2016                 case -ECONNREFUSED:
2017                         event.event = RDMA_CM_EVENT_REJECTED;
2018                         break;
2019                 case -ETIMEDOUT:
2020                         event.event = RDMA_CM_EVENT_UNREACHABLE;
2021                         break;
2022                 default:
2023                         event.event = RDMA_CM_EVENT_CONNECT_ERROR;
2024                         break;
2025                 }
2026                 break;
2027         case IW_CM_EVENT_ESTABLISHED:
2028                 event.event = RDMA_CM_EVENT_ESTABLISHED;
2029                 event.param.conn.initiator_depth = iw_event->ird;
2030                 event.param.conn.responder_resources = iw_event->ord;
2031                 break;
2032         default:
2033                 BUG_ON(1);
2034         }
2035
2036         event.status = iw_event->status;
2037         event.param.conn.private_data = iw_event->private_data;
2038         event.param.conn.private_data_len = iw_event->private_data_len;
2039         ret = id_priv->id.event_handler(&id_priv->id, &event);
2040         if (ret) {
2041                 /* Destroy the CM ID by returning a non-zero value. */
2042                 id_priv->cm_id.iw = NULL;
2043                 cma_exch(id_priv, RDMA_CM_DESTROYING);
2044                 mutex_unlock(&id_priv->handler_mutex);
2045                 rdma_destroy_id(&id_priv->id);
2046                 return ret;
2047         }
2048
2049 out:
2050         mutex_unlock(&id_priv->handler_mutex);
2051         return ret;
2052 }
2053
2054 static int iw_conn_req_handler(struct iw_cm_id *cm_id,
2055                                struct iw_cm_event *iw_event)
2056 {
2057         struct rdma_cm_id *new_cm_id;
2058         struct rdma_id_private *listen_id, *conn_id;
2059         struct rdma_cm_event event;
2060         int ret = -ECONNABORTED;
2061         struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr;
2062         struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr;
2063
2064         listen_id = cm_id->context;
2065
2066         mutex_lock(&listen_id->handler_mutex);
2067         if (listen_id->state != RDMA_CM_LISTEN)
2068                 goto out;
2069
2070         /* Create a new RDMA id for the new IW CM ID */
2071         new_cm_id = rdma_create_id(listen_id->id.route.addr.dev_addr.net,
2072                                    listen_id->id.event_handler,
2073                                    listen_id->id.context,
2074                                    RDMA_PS_TCP, IB_QPT_RC);
2075         if (IS_ERR(new_cm_id)) {
2076                 ret = -ENOMEM;
2077                 goto out;
2078         }
2079         conn_id = container_of(new_cm_id, struct rdma_id_private, id);
2080         mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
2081         conn_id->state = RDMA_CM_CONNECT;
2082
2083         ret = rdma_translate_ip(laddr, &conn_id->id.route.addr.dev_addr, NULL);
2084         if (ret) {
2085                 mutex_unlock(&conn_id->handler_mutex);
2086                 rdma_destroy_id(new_cm_id);
2087                 goto out;
2088         }
2089
2090         ret = cma_acquire_dev(conn_id, listen_id);
2091         if (ret) {
2092                 mutex_unlock(&conn_id->handler_mutex);
2093                 rdma_destroy_id(new_cm_id);
2094                 goto out;
2095         }
2096
2097         conn_id->cm_id.iw = cm_id;
2098         cm_id->context = conn_id;
2099         cm_id->cm_handler = cma_iw_handler;
2100
2101         memcpy(cma_src_addr(conn_id), laddr, rdma_addr_size(laddr));
2102         memcpy(cma_dst_addr(conn_id), raddr, rdma_addr_size(raddr));
2103
2104         memset(&event, 0, sizeof event);
2105         event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
2106         event.param.conn.private_data = iw_event->private_data;
2107         event.param.conn.private_data_len = iw_event->private_data_len;
2108         event.param.conn.initiator_depth = iw_event->ird;
2109         event.param.conn.responder_resources = iw_event->ord;
2110
2111         /*
2112          * Protect against the user destroying conn_id from another thread
2113          * until we're done accessing it.
2114          */
2115         atomic_inc(&conn_id->refcount);
2116         ret = conn_id->id.event_handler(&conn_id->id, &event);
2117         if (ret) {
2118                 /* User wants to destroy the CM ID */
2119                 conn_id->cm_id.iw = NULL;
2120                 cma_exch(conn_id, RDMA_CM_DESTROYING);
2121                 mutex_unlock(&conn_id->handler_mutex);
2122                 mutex_unlock(&listen_id->handler_mutex);
2123                 cma_deref_id(conn_id);
2124                 rdma_destroy_id(&conn_id->id);
2125                 return ret;
2126         }
2127
2128         mutex_unlock(&conn_id->handler_mutex);
2129         cma_deref_id(conn_id);
2130
2131 out:
2132         mutex_unlock(&listen_id->handler_mutex);
2133         return ret;
2134 }
2135
2136 static int cma_ib_listen(struct rdma_id_private *id_priv)
2137 {
2138         struct sockaddr *addr;
2139         struct ib_cm_id *id;
2140         __be64 svc_id;
2141
2142         addr = cma_src_addr(id_priv);
2143         svc_id = rdma_get_service_id(&id_priv->id, addr);
2144         id = ib_cm_insert_listen(id_priv->id.device, cma_req_handler, svc_id);
2145         if (IS_ERR(id))
2146                 return PTR_ERR(id);
2147         id_priv->cm_id.ib = id;
2148
2149         return 0;
2150 }
2151
2152 static int cma_iw_listen(struct rdma_id_private *id_priv, int backlog)
2153 {
2154         int ret;
2155         struct iw_cm_id *id;
2156
2157         id = iw_create_cm_id(id_priv->id.device,
2158                              iw_conn_req_handler,
2159                              id_priv);
2160         if (IS_ERR(id))
2161                 return PTR_ERR(id);
2162
2163         id->tos = id_priv->tos;
2164         id_priv->cm_id.iw = id;
2165
2166         memcpy(&id_priv->cm_id.iw->local_addr, cma_src_addr(id_priv),
2167                rdma_addr_size(cma_src_addr(id_priv)));
2168
2169         ret = iw_cm_listen(id_priv->cm_id.iw, backlog);
2170
2171         if (ret) {
2172                 iw_destroy_cm_id(id_priv->cm_id.iw);
2173                 id_priv->cm_id.iw = NULL;
2174         }
2175
2176         return ret;
2177 }
2178
2179 static int cma_listen_handler(struct rdma_cm_id *id,
2180                               struct rdma_cm_event *event)
2181 {
2182         struct rdma_id_private *id_priv = id->context;
2183
2184         id->context = id_priv->id.context;
2185         id->event_handler = id_priv->id.event_handler;
2186         return id_priv->id.event_handler(id, event);
2187 }
2188
2189 static void cma_listen_on_dev(struct rdma_id_private *id_priv,
2190                               struct cma_device *cma_dev)
2191 {
2192         struct rdma_id_private *dev_id_priv;
2193         struct rdma_cm_id *id;
2194         struct net *net = id_priv->id.route.addr.dev_addr.net;
2195         int ret;
2196
2197         if (cma_family(id_priv) == AF_IB && !rdma_cap_ib_cm(cma_dev->device, 1))
2198                 return;
2199
2200         id = rdma_create_id(net, cma_listen_handler, id_priv, id_priv->id.ps,
2201                             id_priv->id.qp_type);
2202         if (IS_ERR(id))
2203                 return;
2204
2205         dev_id_priv = container_of(id, struct rdma_id_private, id);
2206
2207         dev_id_priv->state = RDMA_CM_ADDR_BOUND;
2208         memcpy(cma_src_addr(dev_id_priv), cma_src_addr(id_priv),
2209                rdma_addr_size(cma_src_addr(id_priv)));
2210
2211         _cma_attach_to_dev(dev_id_priv, cma_dev);
2212         list_add_tail(&dev_id_priv->listen_list, &id_priv->listen_list);
2213         atomic_inc(&id_priv->refcount);
2214         dev_id_priv->internal_id = 1;
2215         dev_id_priv->afonly = id_priv->afonly;
2216
2217         ret = rdma_listen(id, id_priv->backlog);
2218         if (ret)
2219                 pr_warn("RDMA CMA: cma_listen_on_dev, error %d, listening on device %s\n",
2220                         ret, cma_dev->device->name);
2221 }
2222
2223 static void cma_listen_on_all(struct rdma_id_private *id_priv)
2224 {
2225         struct cma_device *cma_dev;
2226
2227         mutex_lock(&lock);
2228         list_add_tail(&id_priv->list, &listen_any_list);
2229         list_for_each_entry(cma_dev, &dev_list, list)
2230                 cma_listen_on_dev(id_priv, cma_dev);
2231         mutex_unlock(&lock);
2232 }
2233
2234 void rdma_set_service_type(struct rdma_cm_id *id, int tos)
2235 {
2236         struct rdma_id_private *id_priv;
2237
2238         id_priv = container_of(id, struct rdma_id_private, id);
2239         id_priv->tos = (u8) tos;
2240 }
2241 EXPORT_SYMBOL(rdma_set_service_type);
2242
2243 static void cma_query_handler(int status, struct ib_sa_path_rec *path_rec,
2244                               void *context)
2245 {
2246         struct cma_work *work = context;
2247         struct rdma_route *route;
2248
2249         route = &work->id->id.route;
2250
2251         if (!status) {
2252                 route->num_paths = 1;
2253                 *route->path_rec = *path_rec;
2254         } else {
2255                 work->old_state = RDMA_CM_ROUTE_QUERY;
2256                 work->new_state = RDMA_CM_ADDR_RESOLVED;
2257                 work->event.event = RDMA_CM_EVENT_ROUTE_ERROR;
2258                 work->event.status = status;
2259         }
2260
2261         queue_work(cma_wq, &work->work);
2262 }
2263
2264 static int cma_query_ib_route(struct rdma_id_private *id_priv, int timeout_ms,
2265                               struct cma_work *work)
2266 {
2267         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
2268         struct ib_sa_path_rec path_rec;
2269         ib_sa_comp_mask comp_mask;
2270         struct sockaddr_in6 *sin6;
2271         struct sockaddr_ib *sib;
2272
2273         memset(&path_rec, 0, sizeof path_rec);
2274         rdma_addr_get_sgid(dev_addr, &path_rec.sgid);
2275         rdma_addr_get_dgid(dev_addr, &path_rec.dgid);
2276         path_rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
2277         path_rec.numb_path = 1;
2278         path_rec.reversible = 1;
2279         path_rec.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
2280
2281         comp_mask = IB_SA_PATH_REC_DGID | IB_SA_PATH_REC_SGID |
2282                     IB_SA_PATH_REC_PKEY | IB_SA_PATH_REC_NUMB_PATH |
2283                     IB_SA_PATH_REC_REVERSIBLE | IB_SA_PATH_REC_SERVICE_ID;
2284
2285         switch (cma_family(id_priv)) {
2286         case AF_INET:
2287                 path_rec.qos_class = cpu_to_be16((u16) id_priv->tos);
2288                 comp_mask |= IB_SA_PATH_REC_QOS_CLASS;
2289                 break;
2290         case AF_INET6:
2291                 sin6 = (struct sockaddr_in6 *) cma_src_addr(id_priv);
2292                 path_rec.traffic_class = (u8) (be32_to_cpu(sin6->sin6_flowinfo) >> 20);
2293                 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
2294                 break;
2295         case AF_IB:
2296                 sib = (struct sockaddr_ib *) cma_src_addr(id_priv);
2297                 path_rec.traffic_class = (u8) (be32_to_cpu(sib->sib_flowinfo) >> 20);
2298                 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
2299                 break;
2300         }
2301
2302         id_priv->query_id = ib_sa_path_rec_get(&sa_client, id_priv->id.device,
2303                                                id_priv->id.port_num, &path_rec,
2304                                                comp_mask, timeout_ms,
2305                                                GFP_KERNEL, cma_query_handler,
2306                                                work, &id_priv->query);
2307
2308         return (id_priv->query_id < 0) ? id_priv->query_id : 0;
2309 }
2310
2311 static void cma_work_handler(struct work_struct *_work)
2312 {
2313         struct cma_work *work = container_of(_work, struct cma_work, work);
2314         struct rdma_id_private *id_priv = work->id;
2315         int destroy = 0;
2316
2317         mutex_lock(&id_priv->handler_mutex);
2318         if (!cma_comp_exch(id_priv, work->old_state, work->new_state))
2319                 goto out;
2320
2321         if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
2322                 cma_exch(id_priv, RDMA_CM_DESTROYING);
2323                 destroy = 1;
2324         }
2325 out:
2326         mutex_unlock(&id_priv->handler_mutex);
2327         cma_deref_id(id_priv);
2328         if (destroy)
2329                 rdma_destroy_id(&id_priv->id);
2330         kfree(work);
2331 }
2332
2333 static void cma_ndev_work_handler(struct work_struct *_work)
2334 {
2335         struct cma_ndev_work *work = container_of(_work, struct cma_ndev_work, work);
2336         struct rdma_id_private *id_priv = work->id;
2337         int destroy = 0;
2338
2339         mutex_lock(&id_priv->handler_mutex);
2340         if (id_priv->state == RDMA_CM_DESTROYING ||
2341             id_priv->state == RDMA_CM_DEVICE_REMOVAL)
2342                 goto out;
2343
2344         if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
2345                 cma_exch(id_priv, RDMA_CM_DESTROYING);
2346                 destroy = 1;
2347         }
2348
2349 out:
2350         mutex_unlock(&id_priv->handler_mutex);
2351         cma_deref_id(id_priv);
2352         if (destroy)
2353                 rdma_destroy_id(&id_priv->id);
2354         kfree(work);
2355 }
2356
2357 static int cma_resolve_ib_route(struct rdma_id_private *id_priv, int timeout_ms)
2358 {
2359         struct rdma_route *route = &id_priv->id.route;
2360         struct cma_work *work;
2361         int ret;
2362
2363         work = kzalloc(sizeof *work, GFP_KERNEL);
2364         if (!work)
2365                 return -ENOMEM;
2366
2367         work->id = id_priv;
2368         INIT_WORK(&work->work, cma_work_handler);
2369         work->old_state = RDMA_CM_ROUTE_QUERY;
2370         work->new_state = RDMA_CM_ROUTE_RESOLVED;
2371         work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
2372
2373         if (!route->path_rec)
2374                 route->path_rec = kmalloc(sizeof *route->path_rec, GFP_KERNEL);
2375         if (!route->path_rec) {
2376                 ret = -ENOMEM;
2377                 goto err1;
2378         }
2379
2380         ret = cma_query_ib_route(id_priv, timeout_ms, work);
2381         if (ret)
2382                 goto err2;
2383
2384         return 0;
2385 err2:
2386         kfree(route->path_rec);
2387         route->path_rec = NULL;
2388 err1:
2389         kfree(work);
2390         return ret;
2391 }
2392
2393 int rdma_set_ib_paths(struct rdma_cm_id *id,
2394                       struct ib_sa_path_rec *path_rec, int num_paths)
2395 {
2396         struct rdma_id_private *id_priv;
2397         int ret;
2398
2399         id_priv = container_of(id, struct rdma_id_private, id);
2400         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
2401                            RDMA_CM_ROUTE_RESOLVED))
2402                 return -EINVAL;
2403
2404         id->route.path_rec = kmemdup(path_rec, sizeof *path_rec * num_paths,
2405                                      GFP_KERNEL);
2406         if (!id->route.path_rec) {
2407                 ret = -ENOMEM;
2408                 goto err;
2409         }
2410
2411         id->route.num_paths = num_paths;
2412         return 0;
2413 err:
2414         cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_ADDR_RESOLVED);
2415         return ret;
2416 }
2417 EXPORT_SYMBOL(rdma_set_ib_paths);
2418
2419 static int cma_resolve_iw_route(struct rdma_id_private *id_priv, int timeout_ms)
2420 {
2421         struct cma_work *work;
2422
2423         work = kzalloc(sizeof *work, GFP_KERNEL);
2424         if (!work)
2425                 return -ENOMEM;
2426
2427         work->id = id_priv;
2428         INIT_WORK(&work->work, cma_work_handler);
2429         work->old_state = RDMA_CM_ROUTE_QUERY;
2430         work->new_state = RDMA_CM_ROUTE_RESOLVED;
2431         work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
2432         queue_work(cma_wq, &work->work);
2433         return 0;
2434 }
2435
2436 static int iboe_tos_to_sl(struct net_device *ndev, int tos)
2437 {
2438         int prio;
2439         struct net_device *dev;
2440
2441         prio = rt_tos2priority(tos);
2442         dev = ndev->priv_flags & IFF_802_1Q_VLAN ?
2443                 vlan_dev_real_dev(ndev) : ndev;
2444
2445         if (dev->num_tc)
2446                 return netdev_get_prio_tc_map(dev, prio);
2447
2448 #if IS_ENABLED(CONFIG_VLAN_8021Q)
2449         if (ndev->priv_flags & IFF_802_1Q_VLAN)
2450                 return (vlan_dev_get_egress_qos_mask(ndev, prio) &
2451                         VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
2452 #endif
2453         return 0;
2454 }
2455
2456 static enum ib_gid_type cma_route_gid_type(enum rdma_network_type network_type,
2457                                            unsigned long supported_gids,
2458                                            enum ib_gid_type default_gid)
2459 {
2460         if ((network_type == RDMA_NETWORK_IPV4 ||
2461              network_type == RDMA_NETWORK_IPV6) &&
2462             test_bit(IB_GID_TYPE_ROCE_UDP_ENCAP, &supported_gids))
2463                 return IB_GID_TYPE_ROCE_UDP_ENCAP;
2464
2465         return default_gid;
2466 }
2467
2468 static int cma_resolve_iboe_route(struct rdma_id_private *id_priv)
2469 {
2470         struct rdma_route *route = &id_priv->id.route;
2471         struct rdma_addr *addr = &route->addr;
2472         struct cma_work *work;
2473         int ret;
2474         struct net_device *ndev = NULL;
2475
2476
2477         work = kzalloc(sizeof *work, GFP_KERNEL);
2478         if (!work)
2479                 return -ENOMEM;
2480
2481         work->id = id_priv;
2482         INIT_WORK(&work->work, cma_work_handler);
2483
2484         route->path_rec = kzalloc(sizeof *route->path_rec, GFP_KERNEL);
2485         if (!route->path_rec) {
2486                 ret = -ENOMEM;
2487                 goto err1;
2488         }
2489
2490         route->num_paths = 1;
2491
2492         if (addr->dev_addr.bound_dev_if) {
2493                 unsigned long supported_gids;
2494
2495                 ndev = dev_get_by_index(&init_net, addr->dev_addr.bound_dev_if);
2496                 if (!ndev) {
2497                         ret = -ENODEV;
2498                         goto err2;
2499                 }
2500
2501                 if (ndev->flags & IFF_LOOPBACK) {
2502                         dev_put(ndev);
2503                         if (!id_priv->id.device->get_netdev) {
2504                                 ret = -EOPNOTSUPP;
2505                                 goto err2;
2506                         }
2507
2508                         ndev = id_priv->id.device->get_netdev(id_priv->id.device,
2509                                                               id_priv->id.port_num);
2510                         if (!ndev) {
2511                                 ret = -ENODEV;
2512                                 goto err2;
2513                         }
2514                 }
2515
2516                 route->path_rec->net = &init_net;
2517                 route->path_rec->ifindex = ndev->ifindex;
2518                 supported_gids = roce_gid_type_mask_support(id_priv->id.device,
2519                                                             id_priv->id.port_num);
2520                 route->path_rec->gid_type =
2521                         cma_route_gid_type(addr->dev_addr.network,
2522                                            supported_gids,
2523                                            id_priv->gid_type);
2524         }
2525         if (!ndev) {
2526                 ret = -ENODEV;
2527                 goto err2;
2528         }
2529
2530         memcpy(route->path_rec->dmac, addr->dev_addr.dst_dev_addr, ETH_ALEN);
2531
2532         rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
2533                     &route->path_rec->sgid);
2534         rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.dst_addr,
2535                     &route->path_rec->dgid);
2536
2537         /* Use the hint from IP Stack to select GID Type */
2538         if (route->path_rec->gid_type < ib_network_to_gid_type(addr->dev_addr.network))
2539                 route->path_rec->gid_type = ib_network_to_gid_type(addr->dev_addr.network);
2540         if (((struct sockaddr *)&id_priv->id.route.addr.dst_addr)->sa_family != AF_IB)
2541                 /* TODO: get the hoplimit from the inet/inet6 device */
2542                 route->path_rec->hop_limit = addr->dev_addr.hoplimit;
2543         else
2544                 route->path_rec->hop_limit = 1;
2545         route->path_rec->reversible = 1;
2546         route->path_rec->pkey = cpu_to_be16(0xffff);
2547         route->path_rec->mtu_selector = IB_SA_EQ;
2548         route->path_rec->sl = iboe_tos_to_sl(ndev, id_priv->tos);
2549         route->path_rec->mtu = iboe_get_mtu(ndev->mtu);
2550         route->path_rec->rate_selector = IB_SA_EQ;
2551         route->path_rec->rate = iboe_get_rate(ndev);
2552         dev_put(ndev);
2553         route->path_rec->packet_life_time_selector = IB_SA_EQ;
2554         route->path_rec->packet_life_time = CMA_IBOE_PACKET_LIFETIME;
2555         if (!route->path_rec->mtu) {
2556                 ret = -EINVAL;
2557                 goto err2;
2558         }
2559
2560         work->old_state = RDMA_CM_ROUTE_QUERY;
2561         work->new_state = RDMA_CM_ROUTE_RESOLVED;
2562         work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
2563         work->event.status = 0;
2564
2565         queue_work(cma_wq, &work->work);
2566
2567         return 0;
2568
2569 err2:
2570         kfree(route->path_rec);
2571         route->path_rec = NULL;
2572         route->num_paths = 0;
2573 err1:
2574         kfree(work);
2575         return ret;
2576 }
2577
2578 int rdma_resolve_route(struct rdma_cm_id *id, int timeout_ms)
2579 {
2580         struct rdma_id_private *id_priv;
2581         int ret;
2582
2583         id_priv = container_of(id, struct rdma_id_private, id);
2584         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED, RDMA_CM_ROUTE_QUERY))
2585                 return -EINVAL;
2586
2587         atomic_inc(&id_priv->refcount);
2588         if (rdma_cap_ib_sa(id->device, id->port_num))
2589                 ret = cma_resolve_ib_route(id_priv, timeout_ms);
2590         else if (rdma_protocol_roce(id->device, id->port_num))
2591                 ret = cma_resolve_iboe_route(id_priv);
2592         else if (rdma_protocol_iwarp(id->device, id->port_num))
2593                 ret = cma_resolve_iw_route(id_priv, timeout_ms);
2594         else
2595                 ret = -ENOSYS;
2596
2597         if (ret)
2598                 goto err;
2599
2600         return 0;
2601 err:
2602         cma_comp_exch(id_priv, RDMA_CM_ROUTE_QUERY, RDMA_CM_ADDR_RESOLVED);
2603         cma_deref_id(id_priv);
2604         return ret;
2605 }
2606 EXPORT_SYMBOL(rdma_resolve_route);
2607
2608 static void cma_set_loopback(struct sockaddr *addr)
2609 {
2610         switch (addr->sa_family) {
2611         case AF_INET:
2612                 ((struct sockaddr_in *) addr)->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
2613                 break;
2614         case AF_INET6:
2615                 ipv6_addr_set(&((struct sockaddr_in6 *) addr)->sin6_addr,
2616                               0, 0, 0, htonl(1));
2617                 break;
2618         default:
2619                 ib_addr_set(&((struct sockaddr_ib *) addr)->sib_addr,
2620                             0, 0, 0, htonl(1));
2621                 break;
2622         }
2623 }
2624
2625 static int cma_bind_loopback(struct rdma_id_private *id_priv)
2626 {
2627         struct cma_device *cma_dev, *cur_dev;
2628         struct ib_port_attr port_attr;
2629         union ib_gid gid;
2630         u16 pkey;
2631         int ret;
2632         u8 p;
2633
2634         cma_dev = NULL;
2635         mutex_lock(&lock);
2636         list_for_each_entry(cur_dev, &dev_list, list) {
2637                 if (cma_family(id_priv) == AF_IB &&
2638                     !rdma_cap_ib_cm(cur_dev->device, 1))
2639                         continue;
2640
2641                 if (!cma_dev)
2642                         cma_dev = cur_dev;
2643
2644                 for (p = 1; p <= cur_dev->device->phys_port_cnt; ++p) {
2645                         if (!ib_query_port(cur_dev->device, p, &port_attr) &&
2646                             port_attr.state == IB_PORT_ACTIVE) {
2647                                 cma_dev = cur_dev;
2648                                 goto port_found;
2649                         }
2650                 }
2651         }
2652
2653         if (!cma_dev) {
2654                 ret = -ENODEV;
2655                 goto out;
2656         }
2657
2658         p = 1;
2659
2660 port_found:
2661         ret = ib_get_cached_gid(cma_dev->device, p, 0, &gid, NULL);
2662         if (ret)
2663                 goto out;
2664
2665         ret = ib_get_cached_pkey(cma_dev->device, p, 0, &pkey);
2666         if (ret)
2667                 goto out;
2668
2669         id_priv->id.route.addr.dev_addr.dev_type =
2670                 (rdma_protocol_ib(cma_dev->device, p)) ?
2671                 ARPHRD_INFINIBAND : ARPHRD_ETHER;
2672
2673         rdma_addr_set_sgid(&id_priv->id.route.addr.dev_addr, &gid);
2674         ib_addr_set_pkey(&id_priv->id.route.addr.dev_addr, pkey);
2675         id_priv->id.port_num = p;
2676         cma_attach_to_dev(id_priv, cma_dev);
2677         cma_set_loopback(cma_src_addr(id_priv));
2678 out:
2679         mutex_unlock(&lock);
2680         return ret;
2681 }
2682
2683 static void addr_handler(int status, struct sockaddr *src_addr,
2684                          struct rdma_dev_addr *dev_addr, void *context)
2685 {
2686         struct rdma_id_private *id_priv = context;
2687         struct rdma_cm_event event;
2688
2689         memset(&event, 0, sizeof event);
2690         mutex_lock(&id_priv->handler_mutex);
2691         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY,
2692                            RDMA_CM_ADDR_RESOLVED))
2693                 goto out;
2694
2695         memcpy(cma_src_addr(id_priv), src_addr, rdma_addr_size(src_addr));
2696         if (!status && !id_priv->cma_dev)
2697                 status = cma_acquire_dev(id_priv, NULL);
2698
2699         if (status) {
2700                 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
2701                                    RDMA_CM_ADDR_BOUND))
2702                         goto out;
2703                 event.event = RDMA_CM_EVENT_ADDR_ERROR;
2704                 event.status = status;
2705         } else
2706                 event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
2707
2708         if (id_priv->id.event_handler(&id_priv->id, &event)) {
2709                 cma_exch(id_priv, RDMA_CM_DESTROYING);
2710                 mutex_unlock(&id_priv->handler_mutex);
2711                 cma_deref_id(id_priv);
2712                 rdma_destroy_id(&id_priv->id);
2713                 return;
2714         }
2715 out:
2716         mutex_unlock(&id_priv->handler_mutex);
2717         cma_deref_id(id_priv);
2718 }
2719
2720 static int cma_resolve_loopback(struct rdma_id_private *id_priv)
2721 {
2722         struct cma_work *work;
2723         union ib_gid gid;
2724         int ret;
2725
2726         work = kzalloc(sizeof *work, GFP_KERNEL);
2727         if (!work)
2728                 return -ENOMEM;
2729
2730         if (!id_priv->cma_dev) {
2731                 ret = cma_bind_loopback(id_priv);
2732                 if (ret)
2733                         goto err;
2734         }
2735
2736         rdma_addr_get_sgid(&id_priv->id.route.addr.dev_addr, &gid);
2737         rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, &gid);
2738
2739         work->id = id_priv;
2740         INIT_WORK(&work->work, cma_work_handler);
2741         work->old_state = RDMA_CM_ADDR_QUERY;
2742         work->new_state = RDMA_CM_ADDR_RESOLVED;
2743         work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
2744         queue_work(cma_wq, &work->work);
2745         return 0;
2746 err:
2747         kfree(work);
2748         return ret;
2749 }
2750
2751 static int cma_resolve_ib_addr(struct rdma_id_private *id_priv)
2752 {
2753         struct cma_work *work;
2754         int ret;
2755
2756         work = kzalloc(sizeof *work, GFP_KERNEL);
2757         if (!work)
2758                 return -ENOMEM;
2759
2760         if (!id_priv->cma_dev) {
2761                 ret = cma_resolve_ib_dev(id_priv);
2762                 if (ret)
2763                         goto err;
2764         }
2765
2766         rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, (union ib_gid *)
2767                 &(((struct sockaddr_ib *) &id_priv->id.route.addr.dst_addr)->sib_addr));
2768
2769         work->id = id_priv;
2770         INIT_WORK(&work->work, cma_work_handler);
2771         work->old_state = RDMA_CM_ADDR_QUERY;
2772         work->new_state = RDMA_CM_ADDR_RESOLVED;
2773         work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
2774         queue_work(cma_wq, &work->work);
2775         return 0;
2776 err:
2777         kfree(work);
2778         return ret;
2779 }
2780
2781 static int cma_bind_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
2782                          struct sockaddr *dst_addr)
2783 {
2784         if (!src_addr || !src_addr->sa_family) {
2785                 src_addr = (struct sockaddr *) &id->route.addr.src_addr;
2786                 src_addr->sa_family = dst_addr->sa_family;
2787                 if (IS_ENABLED(CONFIG_IPV6) &&
2788                     dst_addr->sa_family == AF_INET6) {
2789                         struct sockaddr_in6 *src_addr6 = (struct sockaddr_in6 *) src_addr;
2790                         struct sockaddr_in6 *dst_addr6 = (struct sockaddr_in6 *) dst_addr;
2791                         src_addr6->sin6_scope_id = dst_addr6->sin6_scope_id;
2792                         if (ipv6_addr_type(&dst_addr6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
2793                                 id->route.addr.dev_addr.bound_dev_if = dst_addr6->sin6_scope_id;
2794                 } else if (dst_addr->sa_family == AF_IB) {
2795                         ((struct sockaddr_ib *) src_addr)->sib_pkey =
2796                                 ((struct sockaddr_ib *) dst_addr)->sib_pkey;
2797                 }
2798         }
2799         return rdma_bind_addr(id, src_addr);
2800 }
2801
2802 int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
2803                       struct sockaddr *dst_addr, int timeout_ms)
2804 {
2805         struct rdma_id_private *id_priv;
2806         int ret;
2807
2808         id_priv = container_of(id, struct rdma_id_private, id);
2809         if (id_priv->state == RDMA_CM_IDLE) {
2810                 ret = cma_bind_addr(id, src_addr, dst_addr);
2811                 if (ret)
2812                         return ret;
2813         }
2814
2815         if (cma_family(id_priv) != dst_addr->sa_family)
2816                 return -EINVAL;
2817
2818         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_ADDR_QUERY))
2819                 return -EINVAL;
2820
2821         atomic_inc(&id_priv->refcount);
2822         memcpy(cma_dst_addr(id_priv), dst_addr, rdma_addr_size(dst_addr));
2823         if (cma_any_addr(dst_addr)) {
2824                 ret = cma_resolve_loopback(id_priv);
2825         } else {
2826                 if (dst_addr->sa_family == AF_IB) {
2827                         ret = cma_resolve_ib_addr(id_priv);
2828                 } else {
2829                         ret = rdma_resolve_ip(&addr_client, cma_src_addr(id_priv),
2830                                               dst_addr, &id->route.addr.dev_addr,
2831                                               timeout_ms, addr_handler, id_priv);
2832                 }
2833         }
2834         if (ret)
2835                 goto err;
2836
2837         return 0;
2838 err:
2839         cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY, RDMA_CM_ADDR_BOUND);
2840         cma_deref_id(id_priv);
2841         return ret;
2842 }
2843 EXPORT_SYMBOL(rdma_resolve_addr);
2844
2845 int rdma_set_reuseaddr(struct rdma_cm_id *id, int reuse)
2846 {
2847         struct rdma_id_private *id_priv;
2848         unsigned long flags;
2849         int ret;
2850
2851         id_priv = container_of(id, struct rdma_id_private, id);
2852         spin_lock_irqsave(&id_priv->lock, flags);
2853         if (reuse || id_priv->state == RDMA_CM_IDLE) {
2854                 id_priv->reuseaddr = reuse;
2855                 ret = 0;
2856         } else {
2857                 ret = -EINVAL;
2858         }
2859         spin_unlock_irqrestore(&id_priv->lock, flags);
2860         return ret;
2861 }
2862 EXPORT_SYMBOL(rdma_set_reuseaddr);
2863
2864 int rdma_set_afonly(struct rdma_cm_id *id, int afonly)
2865 {
2866         struct rdma_id_private *id_priv;
2867         unsigned long flags;
2868         int ret;
2869
2870         id_priv = container_of(id, struct rdma_id_private, id);
2871         spin_lock_irqsave(&id_priv->lock, flags);
2872         if (id_priv->state == RDMA_CM_IDLE || id_priv->state == RDMA_CM_ADDR_BOUND) {
2873                 id_priv->options |= (1 << CMA_OPTION_AFONLY);
2874                 id_priv->afonly = afonly;
2875                 ret = 0;
2876         } else {
2877                 ret = -EINVAL;
2878         }
2879         spin_unlock_irqrestore(&id_priv->lock, flags);
2880         return ret;
2881 }
2882 EXPORT_SYMBOL(rdma_set_afonly);
2883
2884 static void cma_bind_port(struct rdma_bind_list *bind_list,
2885                           struct rdma_id_private *id_priv)
2886 {
2887         struct sockaddr *addr;
2888         struct sockaddr_ib *sib;
2889         u64 sid, mask;
2890         __be16 port;
2891
2892         addr = cma_src_addr(id_priv);
2893         port = htons(bind_list->port);
2894
2895         switch (addr->sa_family) {
2896         case AF_INET:
2897                 ((struct sockaddr_in *) addr)->sin_port = port;
2898                 break;
2899         case AF_INET6:
2900                 ((struct sockaddr_in6 *) addr)->sin6_port = port;
2901                 break;
2902         case AF_IB:
2903                 sib = (struct sockaddr_ib *) addr;
2904                 sid = be64_to_cpu(sib->sib_sid);
2905                 mask = be64_to_cpu(sib->sib_sid_mask);
2906                 sib->sib_sid = cpu_to_be64((sid & mask) | (u64) ntohs(port));
2907                 sib->sib_sid_mask = cpu_to_be64(~0ULL);
2908                 break;
2909         }
2910         id_priv->bind_list = bind_list;
2911         hlist_add_head(&id_priv->node, &bind_list->owners);
2912 }
2913
2914 static int cma_alloc_port(enum rdma_port_space ps,
2915                           struct rdma_id_private *id_priv, unsigned short snum)
2916 {
2917         struct rdma_bind_list *bind_list;
2918         int ret;
2919
2920         bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL);
2921         if (!bind_list)
2922                 return -ENOMEM;
2923
2924         ret = cma_ps_alloc(id_priv->id.route.addr.dev_addr.net, ps, bind_list,
2925                            snum);
2926         if (ret < 0)
2927                 goto err;
2928
2929         bind_list->ps = ps;
2930         bind_list->port = (unsigned short)ret;
2931         cma_bind_port(bind_list, id_priv);
2932         return 0;
2933 err:
2934         kfree(bind_list);
2935         return ret == -ENOSPC ? -EADDRNOTAVAIL : ret;
2936 }
2937
2938 static int cma_alloc_any_port(enum rdma_port_space ps,
2939                               struct rdma_id_private *id_priv)
2940 {
2941         static unsigned int last_used_port;
2942         int low, high, remaining;
2943         unsigned int rover;
2944         struct net *net = id_priv->id.route.addr.dev_addr.net;
2945
2946         inet_get_local_port_range(net, &low, &high);
2947         remaining = (high - low) + 1;
2948         rover = prandom_u32() % remaining + low;
2949 retry:
2950         if (last_used_port != rover &&
2951             !cma_ps_find(net, ps, (unsigned short)rover)) {
2952                 int ret = cma_alloc_port(ps, id_priv, rover);
2953                 /*
2954                  * Remember previously used port number in order to avoid
2955                  * re-using same port immediately after it is closed.
2956                  */
2957                 if (!ret)
2958                         last_used_port = rover;
2959                 if (ret != -EADDRNOTAVAIL)
2960                         return ret;
2961         }
2962         if (--remaining) {
2963                 rover++;
2964                 if ((rover < low) || (rover > high))
2965                         rover = low;
2966                 goto retry;
2967         }
2968         return -EADDRNOTAVAIL;
2969 }
2970
2971 /*
2972  * Check that the requested port is available.  This is called when trying to
2973  * bind to a specific port, or when trying to listen on a bound port.  In
2974  * the latter case, the provided id_priv may already be on the bind_list, but
2975  * we still need to check that it's okay to start listening.
2976  */
2977 static int cma_check_port(struct rdma_bind_list *bind_list,
2978                           struct rdma_id_private *id_priv, uint8_t reuseaddr)
2979 {
2980         struct rdma_id_private *cur_id;
2981         struct sockaddr *addr, *cur_addr;
2982
2983         addr = cma_src_addr(id_priv);
2984         hlist_for_each_entry(cur_id, &bind_list->owners, node) {
2985                 if (id_priv == cur_id)
2986                         continue;
2987
2988                 if ((cur_id->state != RDMA_CM_LISTEN) && reuseaddr &&
2989                     cur_id->reuseaddr)
2990                         continue;
2991
2992                 cur_addr = cma_src_addr(cur_id);
2993                 if (id_priv->afonly && cur_id->afonly &&
2994                     (addr->sa_family != cur_addr->sa_family))
2995                         continue;
2996
2997                 if (cma_any_addr(addr) || cma_any_addr(cur_addr))
2998                         return -EADDRNOTAVAIL;
2999
3000                 if (!cma_addr_cmp(addr, cur_addr))
3001                         return -EADDRINUSE;
3002         }
3003         return 0;
3004 }
3005
3006 static int cma_use_port(enum rdma_port_space ps,
3007                         struct rdma_id_private *id_priv)
3008 {
3009         struct rdma_bind_list *bind_list;
3010         unsigned short snum;
3011         int ret;
3012
3013         snum = ntohs(cma_port(cma_src_addr(id_priv)));
3014         if (snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
3015                 return -EACCES;
3016
3017         bind_list = cma_ps_find(id_priv->id.route.addr.dev_addr.net, ps, snum);
3018         if (!bind_list) {
3019                 ret = cma_alloc_port(ps, id_priv, snum);
3020         } else {
3021                 ret = cma_check_port(bind_list, id_priv, id_priv->reuseaddr);
3022                 if (!ret)
3023                         cma_bind_port(bind_list, id_priv);
3024         }
3025         return ret;
3026 }
3027
3028 static int cma_bind_listen(struct rdma_id_private *id_priv)
3029 {
3030         struct rdma_bind_list *bind_list = id_priv->bind_list;
3031         int ret = 0;
3032
3033         mutex_lock(&lock);
3034         if (bind_list->owners.first->next)
3035                 ret = cma_check_port(bind_list, id_priv, 0);
3036         mutex_unlock(&lock);
3037         return ret;
3038 }
3039
3040 static enum rdma_port_space cma_select_inet_ps(
3041                 struct rdma_id_private *id_priv)
3042 {
3043         switch (id_priv->id.ps) {
3044         case RDMA_PS_TCP:
3045         case RDMA_PS_UDP:
3046         case RDMA_PS_IPOIB:
3047         case RDMA_PS_IB:
3048                 return id_priv->id.ps;
3049         default:
3050
3051                 return 0;
3052         }
3053 }
3054
3055 static enum rdma_port_space cma_select_ib_ps(struct rdma_id_private *id_priv)
3056 {
3057         enum rdma_port_space ps = 0;
3058         struct sockaddr_ib *sib;
3059         u64 sid_ps, mask, sid;
3060
3061         sib = (struct sockaddr_ib *) cma_src_addr(id_priv);
3062         mask = be64_to_cpu(sib->sib_sid_mask) & RDMA_IB_IP_PS_MASK;
3063         sid = be64_to_cpu(sib->sib_sid) & mask;
3064
3065         if ((id_priv->id.ps == RDMA_PS_IB) && (sid == (RDMA_IB_IP_PS_IB & mask))) {
3066                 sid_ps = RDMA_IB_IP_PS_IB;
3067                 ps = RDMA_PS_IB;
3068         } else if (((id_priv->id.ps == RDMA_PS_IB) || (id_priv->id.ps == RDMA_PS_TCP)) &&
3069                    (sid == (RDMA_IB_IP_PS_TCP & mask))) {
3070                 sid_ps = RDMA_IB_IP_PS_TCP;
3071                 ps = RDMA_PS_TCP;
3072         } else if (((id_priv->id.ps == RDMA_PS_IB) || (id_priv->id.ps == RDMA_PS_UDP)) &&
3073                    (sid == (RDMA_IB_IP_PS_UDP & mask))) {
3074                 sid_ps = RDMA_IB_IP_PS_UDP;
3075                 ps = RDMA_PS_UDP;
3076         }
3077
3078         if (ps) {
3079                 sib->sib_sid = cpu_to_be64(sid_ps | ntohs(cma_port((struct sockaddr *) sib)));
3080                 sib->sib_sid_mask = cpu_to_be64(RDMA_IB_IP_PS_MASK |
3081                                                 be64_to_cpu(sib->sib_sid_mask));
3082         }
3083         return ps;
3084 }
3085
3086 static int cma_get_port(struct rdma_id_private *id_priv)
3087 {
3088         enum rdma_port_space ps;
3089         int ret;
3090
3091         if (cma_family(id_priv) != AF_IB)
3092                 ps = cma_select_inet_ps(id_priv);
3093         else
3094                 ps = cma_select_ib_ps(id_priv);
3095         if (!ps)
3096                 return -EPROTONOSUPPORT;
3097
3098         mutex_lock(&lock);
3099         if (cma_any_port(cma_src_addr(id_priv)))
3100                 ret = cma_alloc_any_port(ps, id_priv);
3101         else
3102                 ret = cma_use_port(ps, id_priv);
3103         mutex_unlock(&lock);
3104
3105         return ret;
3106 }
3107
3108 static int cma_check_linklocal(struct rdma_dev_addr *dev_addr,
3109                                struct sockaddr *addr)
3110 {
3111 #if IS_ENABLED(CONFIG_IPV6)
3112         struct sockaddr_in6 *sin6;
3113
3114         if (addr->sa_family != AF_INET6)
3115                 return 0;
3116
3117         sin6 = (struct sockaddr_in6 *) addr;
3118
3119         if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
3120                 return 0;
3121
3122         if (!sin6->sin6_scope_id)
3123                         return -EINVAL;
3124
3125         dev_addr->bound_dev_if = sin6->sin6_scope_id;
3126 #endif
3127         return 0;
3128 }
3129
3130 int rdma_listen(struct rdma_cm_id *id, int backlog)
3131 {
3132         struct rdma_id_private *id_priv;
3133         int ret;
3134
3135         id_priv = container_of(id, struct rdma_id_private, id);
3136         if (id_priv->state == RDMA_CM_IDLE) {
3137                 id->route.addr.src_addr.ss_family = AF_INET;
3138                 ret = rdma_bind_addr(id, cma_src_addr(id_priv));
3139                 if (ret)
3140                         return ret;
3141         }
3142
3143         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_LISTEN))
3144                 return -EINVAL;
3145
3146         if (id_priv->reuseaddr) {
3147                 ret = cma_bind_listen(id_priv);
3148                 if (ret)
3149                         goto err;
3150         }
3151
3152         id_priv->backlog = backlog;
3153         if (id->device) {
3154                 if (rdma_cap_ib_cm(id->device, 1)) {
3155                         ret = cma_ib_listen(id_priv);
3156                         if (ret)
3157                                 goto err;
3158                 } else if (rdma_cap_iw_cm(id->device, 1)) {
3159                         ret = cma_iw_listen(id_priv, backlog);
3160                         if (ret)
3161                                 goto err;
3162                 } else {
3163                         ret = -ENOSYS;
3164                         goto err;
3165                 }
3166         } else
3167                 cma_listen_on_all(id_priv);
3168
3169         return 0;
3170 err:
3171         id_priv->backlog = 0;
3172         cma_comp_exch(id_priv, RDMA_CM_LISTEN, RDMA_CM_ADDR_BOUND);
3173         return ret;
3174 }
3175 EXPORT_SYMBOL(rdma_listen);
3176
3177 int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr)
3178 {
3179         struct rdma_id_private *id_priv;
3180         int ret;
3181
3182         if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6 &&
3183             addr->sa_family != AF_IB)
3184                 return -EAFNOSUPPORT;
3185
3186         id_priv = container_of(id, struct rdma_id_private, id);
3187         if (!cma_comp_exch(id_priv, RDMA_CM_IDLE, RDMA_CM_ADDR_BOUND))
3188                 return -EINVAL;
3189
3190         ret = cma_check_linklocal(&id->route.addr.dev_addr, addr);
3191         if (ret)
3192                 goto err1;
3193
3194         memcpy(cma_src_addr(id_priv), addr, rdma_addr_size(addr));
3195         if (!cma_any_addr(addr)) {
3196                 ret = cma_translate_addr(addr, &id->route.addr.dev_addr);
3197                 if (ret)
3198                         goto err1;
3199
3200                 ret = cma_acquire_dev(id_priv, NULL);
3201                 if (ret)
3202                         goto err1;
3203         }
3204
3205         if (!(id_priv->options & (1 << CMA_OPTION_AFONLY))) {
3206                 if (addr->sa_family == AF_INET)
3207                         id_priv->afonly = 1;
3208 #if IS_ENABLED(CONFIG_IPV6)
3209                 else if (addr->sa_family == AF_INET6) {
3210                         struct net *net = id_priv->id.route.addr.dev_addr.net;
3211
3212                         id_priv->afonly = net->ipv6.sysctl.bindv6only;
3213                 }
3214 #endif
3215         }
3216         ret = cma_get_port(id_priv);
3217         if (ret)
3218                 goto err2;
3219
3220         return 0;
3221 err2:
3222         if (id_priv->cma_dev)
3223                 cma_release_dev(id_priv);
3224 err1:
3225         cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_IDLE);
3226         return ret;
3227 }
3228 EXPORT_SYMBOL(rdma_bind_addr);
3229
3230 static int cma_format_hdr(void *hdr, struct rdma_id_private *id_priv)
3231 {
3232         struct cma_hdr *cma_hdr;
3233
3234         cma_hdr = hdr;
3235         cma_hdr->cma_version = CMA_VERSION;
3236         if (cma_family(id_priv) == AF_INET) {
3237                 struct sockaddr_in *src4, *dst4;
3238
3239                 src4 = (struct sockaddr_in *) cma_src_addr(id_priv);
3240                 dst4 = (struct sockaddr_in *) cma_dst_addr(id_priv);
3241
3242                 cma_set_ip_ver(cma_hdr, 4);
3243                 cma_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
3244                 cma_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
3245                 cma_hdr->port = src4->sin_port;
3246         } else if (cma_family(id_priv) == AF_INET6) {
3247                 struct sockaddr_in6 *src6, *dst6;
3248
3249                 src6 = (struct sockaddr_in6 *) cma_src_addr(id_priv);
3250                 dst6 = (struct sockaddr_in6 *) cma_dst_addr(id_priv);
3251
3252                 cma_set_ip_ver(cma_hdr, 6);
3253                 cma_hdr->src_addr.ip6 = src6->sin6_addr;
3254                 cma_hdr->dst_addr.ip6 = dst6->sin6_addr;
3255                 cma_hdr->port = src6->sin6_port;
3256         }
3257         return 0;
3258 }
3259
3260 static int cma_sidr_rep_handler(struct ib_cm_id *cm_id,
3261                                 struct ib_cm_event *ib_event)
3262 {
3263         struct rdma_id_private *id_priv = cm_id->context;
3264         struct rdma_cm_event event;
3265         struct ib_cm_sidr_rep_event_param *rep = &ib_event->param.sidr_rep_rcvd;
3266         int ret = 0;
3267
3268         mutex_lock(&id_priv->handler_mutex);
3269         if (id_priv->state != RDMA_CM_CONNECT)
3270                 goto out;
3271
3272         memset(&event, 0, sizeof event);
3273         switch (ib_event->event) {
3274         case IB_CM_SIDR_REQ_ERROR:
3275                 event.event = RDMA_CM_EVENT_UNREACHABLE;
3276                 event.status = -ETIMEDOUT;
3277                 break;
3278         case IB_CM_SIDR_REP_RECEIVED:
3279                 event.param.ud.private_data = ib_event->private_data;
3280                 event.param.ud.private_data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
3281                 if (rep->status != IB_SIDR_SUCCESS) {
3282                         event.event = RDMA_CM_EVENT_UNREACHABLE;
3283                         event.status = ib_event->param.sidr_rep_rcvd.status;
3284                         break;
3285                 }
3286                 ret = cma_set_qkey(id_priv, rep->qkey);
3287                 if (ret) {
3288                         event.event = RDMA_CM_EVENT_ADDR_ERROR;
3289                         event.status = ret;
3290                         break;
3291                 }
3292                 ib_init_ah_from_path(id_priv->id.device, id_priv->id.port_num,
3293                                      id_priv->id.route.path_rec,
3294                                      &event.param.ud.ah_attr);
3295                 event.param.ud.qp_num = rep->qpn;
3296                 event.param.ud.qkey = rep->qkey;
3297                 event.event = RDMA_CM_EVENT_ESTABLISHED;
3298                 event.status = 0;
3299                 break;
3300         default:
3301                 pr_err("RDMA CMA: unexpected IB CM event: %d\n",
3302                        ib_event->event);
3303                 goto out;
3304         }
3305
3306         ret = id_priv->id.event_handler(&id_priv->id, &event);
3307         if (ret) {
3308                 /* Destroy the CM ID by returning a non-zero value. */
3309                 id_priv->cm_id.ib = NULL;
3310                 cma_exch(id_priv, RDMA_CM_DESTROYING);
3311                 mutex_unlock(&id_priv->handler_mutex);
3312                 rdma_destroy_id(&id_priv->id);
3313                 return ret;
3314         }
3315 out:
3316         mutex_unlock(&id_priv->handler_mutex);
3317         return ret;
3318 }
3319
3320 static int cma_resolve_ib_udp(struct rdma_id_private *id_priv,
3321                               struct rdma_conn_param *conn_param)
3322 {
3323         struct ib_cm_sidr_req_param req;
3324         struct ib_cm_id *id;
3325         void *private_data;
3326         u8 offset;
3327         int ret;
3328
3329         memset(&req, 0, sizeof req);
3330         offset = cma_user_data_offset(id_priv);
3331         req.private_data_len = offset + conn_param->private_data_len;
3332         if (req.private_data_len < conn_param->private_data_len)
3333                 return -EINVAL;
3334
3335         if (req.private_data_len) {
3336                 private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
3337                 if (!private_data)
3338                         return -ENOMEM;
3339         } else {
3340                 private_data = NULL;
3341         }
3342
3343         if (conn_param->private_data && conn_param->private_data_len)
3344                 memcpy(private_data + offset, conn_param->private_data,
3345                        conn_param->private_data_len);
3346
3347         if (private_data) {
3348                 ret = cma_format_hdr(private_data, id_priv);
3349                 if (ret)
3350                         goto out;
3351                 req.private_data = private_data;
3352         }
3353
3354         id = ib_create_cm_id(id_priv->id.device, cma_sidr_rep_handler,
3355                              id_priv);
3356         if (IS_ERR(id)) {
3357                 ret = PTR_ERR(id);
3358                 goto out;
3359         }
3360         id_priv->cm_id.ib = id;
3361
3362         req.path = id_priv->id.route.path_rec;
3363         req.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
3364         req.timeout_ms = 1 << (CMA_CM_RESPONSE_TIMEOUT - 8);
3365         req.max_cm_retries = CMA_MAX_CM_RETRIES;
3366
3367         ret = ib_send_cm_sidr_req(id_priv->cm_id.ib, &req);
3368         if (ret) {
3369                 ib_destroy_cm_id(id_priv->cm_id.ib);
3370                 id_priv->cm_id.ib = NULL;
3371         }
3372 out:
3373         kfree(private_data);
3374         return ret;
3375 }
3376
3377 static int cma_connect_ib(struct rdma_id_private *id_priv,
3378                           struct rdma_conn_param *conn_param)
3379 {
3380         struct ib_cm_req_param req;
3381         struct rdma_route *route;
3382         void *private_data;
3383         struct ib_cm_id *id;
3384         u8 offset;
3385         int ret;
3386
3387         memset(&req, 0, sizeof req);
3388         offset = cma_user_data_offset(id_priv);
3389         req.private_data_len = offset + conn_param->private_data_len;
3390         if (req.private_data_len < conn_param->private_data_len)
3391                 return -EINVAL;
3392
3393         if (req.private_data_len) {
3394                 private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
3395                 if (!private_data)
3396                         return -ENOMEM;
3397         } else {
3398                 private_data = NULL;
3399         }
3400
3401         if (conn_param->private_data && conn_param->private_data_len)
3402                 memcpy(private_data + offset, conn_param->private_data,
3403                        conn_param->private_data_len);
3404
3405         id = ib_create_cm_id(id_priv->id.device, cma_ib_handler, id_priv);
3406         if (IS_ERR(id)) {
3407                 ret = PTR_ERR(id);
3408                 goto out;
3409         }
3410         id_priv->cm_id.ib = id;
3411
3412         route = &id_priv->id.route;
3413         if (private_data) {
3414                 ret = cma_format_hdr(private_data, id_priv);
3415                 if (ret)
3416                         goto out;
3417                 req.private_data = private_data;
3418         }
3419
3420         req.primary_path = &route->path_rec[0];
3421         if (route->num_paths == 2)
3422                 req.alternate_path = &route->path_rec[1];
3423
3424         req.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
3425         req.qp_num = id_priv->qp_num;
3426         req.qp_type = id_priv->id.qp_type;
3427         req.starting_psn = id_priv->seq_num;
3428         req.responder_resources = conn_param->responder_resources;
3429         req.initiator_depth = conn_param->initiator_depth;
3430         req.flow_control = conn_param->flow_control;
3431         req.retry_count = min_t(u8, 7, conn_param->retry_count);
3432         req.rnr_retry_count = min_t(u8, 7, conn_param->rnr_retry_count);
3433         req.remote_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
3434         req.local_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
3435         req.max_cm_retries = CMA_MAX_CM_RETRIES;
3436         req.srq = id_priv->srq ? 1 : 0;
3437
3438         ret = ib_send_cm_req(id_priv->cm_id.ib, &req);
3439 out:
3440         if (ret && !IS_ERR(id)) {
3441                 ib_destroy_cm_id(id);
3442                 id_priv->cm_id.ib = NULL;
3443         }
3444
3445         kfree(private_data);
3446         return ret;
3447 }
3448
3449 static int cma_connect_iw(struct rdma_id_private *id_priv,
3450                           struct rdma_conn_param *conn_param)
3451 {
3452         struct iw_cm_id *cm_id;
3453         int ret;
3454         struct iw_cm_conn_param iw_param;
3455
3456         cm_id = iw_create_cm_id(id_priv->id.device, cma_iw_handler, id_priv);
3457         if (IS_ERR(cm_id))
3458                 return PTR_ERR(cm_id);
3459
3460         cm_id->tos = id_priv->tos;
3461         id_priv->cm_id.iw = cm_id;
3462
3463         memcpy(&cm_id->local_addr, cma_src_addr(id_priv),
3464                rdma_addr_size(cma_src_addr(id_priv)));
3465         memcpy(&cm_id->remote_addr, cma_dst_addr(id_priv),
3466                rdma_addr_size(cma_dst_addr(id_priv)));
3467
3468         ret = cma_modify_qp_rtr(id_priv, conn_param);
3469         if (ret)
3470                 goto out;
3471
3472         if (conn_param) {
3473                 iw_param.ord = conn_param->initiator_depth;
3474                 iw_param.ird = conn_param->responder_resources;
3475                 iw_param.private_data = conn_param->private_data;
3476                 iw_param.private_data_len = conn_param->private_data_len;
3477                 iw_param.qpn = id_priv->id.qp ? id_priv->qp_num : conn_param->qp_num;
3478         } else {
3479                 memset(&iw_param, 0, sizeof iw_param);
3480                 iw_param.qpn = id_priv->qp_num;
3481         }
3482         ret = iw_cm_connect(cm_id, &iw_param);
3483 out:
3484         if (ret) {
3485                 iw_destroy_cm_id(cm_id);
3486                 id_priv->cm_id.iw = NULL;
3487         }
3488         return ret;
3489 }
3490
3491 int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
3492 {
3493         struct rdma_id_private *id_priv;
3494         int ret;
3495
3496         id_priv = container_of(id, struct rdma_id_private, id);
3497         if (!cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_CONNECT))
3498                 return -EINVAL;
3499
3500         if (!id->qp) {
3501                 id_priv->qp_num = conn_param->qp_num;
3502                 id_priv->srq = conn_param->srq;
3503         }
3504
3505         if (rdma_cap_ib_cm(id->device, id->port_num)) {
3506                 if (id->qp_type == IB_QPT_UD)
3507                         ret = cma_resolve_ib_udp(id_priv, conn_param);
3508                 else
3509                         ret = cma_connect_ib(id_priv, conn_param);
3510         } else if (rdma_cap_iw_cm(id->device, id->port_num))
3511                 ret = cma_connect_iw(id_priv, conn_param);
3512         else
3513                 ret = -ENOSYS;
3514         if (ret)
3515                 goto err;
3516
3517         return 0;
3518 err:
3519         cma_comp_exch(id_priv, RDMA_CM_CONNECT, RDMA_CM_ROUTE_RESOLVED);
3520         return ret;
3521 }
3522 EXPORT_SYMBOL(rdma_connect);
3523
3524 static int cma_accept_ib(struct rdma_id_private *id_priv,
3525                          struct rdma_conn_param *conn_param)
3526 {
3527         struct ib_cm_rep_param rep;
3528         int ret;
3529
3530         ret = cma_modify_qp_rtr(id_priv, conn_param);
3531         if (ret)
3532                 goto out;
3533
3534         ret = cma_modify_qp_rts(id_priv, conn_param);
3535         if (ret)
3536                 goto out;
3537
3538         memset(&rep, 0, sizeof rep);
3539         rep.qp_num = id_priv->qp_num;
3540         rep.starting_psn = id_priv->seq_num;
3541         rep.private_data = conn_param->private_data;
3542         rep.private_data_len = conn_param->private_data_len;
3543         rep.responder_resources = conn_param->responder_resources;
3544         rep.initiator_depth = conn_param->initiator_depth;
3545         rep.failover_accepted = 0;
3546         rep.flow_control = conn_param->flow_control;
3547         rep.rnr_retry_count = min_t(u8, 7, conn_param->rnr_retry_count);
3548         rep.srq = id_priv->srq ? 1 : 0;
3549
3550         ret = ib_send_cm_rep(id_priv->cm_id.ib, &rep);
3551 out:
3552         return ret;
3553 }
3554
3555 static int cma_accept_iw(struct rdma_id_private *id_priv,
3556                   struct rdma_conn_param *conn_param)
3557 {
3558         struct iw_cm_conn_param iw_param;
3559         int ret;
3560
3561         if (!conn_param)
3562                 return -EINVAL;
3563
3564         ret = cma_modify_qp_rtr(id_priv, conn_param);
3565         if (ret)
3566                 return ret;
3567
3568         iw_param.ord = conn_param->initiator_depth;
3569         iw_param.ird = conn_param->responder_resources;
3570         iw_param.private_data = conn_param->private_data;
3571         iw_param.private_data_len = conn_param->private_data_len;
3572         if (id_priv->id.qp) {
3573                 iw_param.qpn = id_priv->qp_num;
3574         } else
3575                 iw_param.qpn = conn_param->qp_num;
3576
3577         return iw_cm_accept(id_priv->cm_id.iw, &iw_param);
3578 }
3579
3580 static int cma_send_sidr_rep(struct rdma_id_private *id_priv,
3581                              enum ib_cm_sidr_status status, u32 qkey,
3582                              const void *private_data, int private_data_len)
3583 {
3584         struct ib_cm_sidr_rep_param rep;
3585         int ret;
3586
3587         memset(&rep, 0, sizeof rep);
3588         rep.status = status;
3589         if (status == IB_SIDR_SUCCESS) {
3590                 ret = cma_set_qkey(id_priv, qkey);
3591                 if (ret)
3592                         return ret;
3593                 rep.qp_num = id_priv->qp_num;
3594                 rep.qkey = id_priv->qkey;
3595         }
3596         rep.private_data = private_data;
3597         rep.private_data_len = private_data_len;
3598
3599         return ib_send_cm_sidr_rep(id_priv->cm_id.ib, &rep);
3600 }
3601
3602 int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
3603 {
3604         struct rdma_id_private *id_priv;
3605         int ret;
3606
3607         id_priv = container_of(id, struct rdma_id_private, id);
3608
3609         id_priv->owner = task_pid_nr(current);
3610
3611         if (!cma_comp(id_priv, RDMA_CM_CONNECT))
3612                 return -EINVAL;
3613
3614         if (!id->qp && conn_param) {
3615                 id_priv->qp_num = conn_param->qp_num;
3616                 id_priv->srq = conn_param->srq;
3617         }
3618
3619         if (rdma_cap_ib_cm(id->device, id->port_num)) {
3620                 if (id->qp_type == IB_QPT_UD) {
3621                         if (conn_param)
3622                                 ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
3623                                                         conn_param->qkey,
3624                                                         conn_param->private_data,
3625                                                         conn_param->private_data_len);
3626                         else
3627                                 ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
3628                                                         0, NULL, 0);
3629                 } else {
3630                         if (conn_param)
3631                                 ret = cma_accept_ib(id_priv, conn_param);
3632                         else
3633                                 ret = cma_rep_recv(id_priv);
3634                 }
3635         } else if (rdma_cap_iw_cm(id->device, id->port_num))
3636                 ret = cma_accept_iw(id_priv, conn_param);
3637         else
3638                 ret = -ENOSYS;
3639
3640         if (ret)
3641                 goto reject;
3642
3643         return 0;
3644 reject:
3645         cma_modify_qp_err(id_priv);
3646         rdma_reject(id, NULL, 0);
3647         return ret;
3648 }
3649 EXPORT_SYMBOL(rdma_accept);
3650
3651 int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event)
3652 {
3653         struct rdma_id_private *id_priv;
3654         int ret;
3655
3656         id_priv = container_of(id, struct rdma_id_private, id);
3657         if (!id_priv->cm_id.ib)
3658                 return -EINVAL;
3659
3660         switch (id->device->node_type) {
3661         case RDMA_NODE_IB_CA:
3662                 ret = ib_cm_notify(id_priv->cm_id.ib, event);
3663                 break;
3664         default:
3665                 ret = 0;
3666                 break;
3667         }
3668         return ret;
3669 }
3670 EXPORT_SYMBOL(rdma_notify);
3671
3672 int rdma_reject(struct rdma_cm_id *id, const void *private_data,
3673                 u8 private_data_len)
3674 {
3675         struct rdma_id_private *id_priv;
3676         int ret;
3677
3678         id_priv = container_of(id, struct rdma_id_private, id);
3679         if (!id_priv->cm_id.ib)
3680                 return -EINVAL;
3681
3682         if (rdma_cap_ib_cm(id->device, id->port_num)) {
3683                 if (id->qp_type == IB_QPT_UD)
3684                         ret = cma_send_sidr_rep(id_priv, IB_SIDR_REJECT, 0,
3685                                                 private_data, private_data_len);
3686                 else
3687                         ret = ib_send_cm_rej(id_priv->cm_id.ib,
3688                                              IB_CM_REJ_CONSUMER_DEFINED, NULL,
3689                                              0, private_data, private_data_len);
3690         } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
3691                 ret = iw_cm_reject(id_priv->cm_id.iw,
3692                                    private_data, private_data_len);
3693         } else
3694                 ret = -ENOSYS;
3695
3696         return ret;
3697 }
3698 EXPORT_SYMBOL(rdma_reject);
3699
3700 int rdma_disconnect(struct rdma_cm_id *id)
3701 {
3702         struct rdma_id_private *id_priv;
3703         int ret;
3704
3705         id_priv = container_of(id, struct rdma_id_private, id);
3706         if (!id_priv->cm_id.ib)
3707                 return -EINVAL;
3708
3709         if (rdma_cap_ib_cm(id->device, id->port_num)) {
3710                 ret = cma_modify_qp_err(id_priv);
3711                 if (ret)
3712                         goto out;
3713                 /* Initiate or respond to a disconnect. */
3714                 if (ib_send_cm_dreq(id_priv->cm_id.ib, NULL, 0))
3715                         ib_send_cm_drep(id_priv->cm_id.ib, NULL, 0);
3716         } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
3717                 ret = iw_cm_disconnect(id_priv->cm_id.iw, 0);
3718         } else
3719                 ret = -EINVAL;
3720
3721 out:
3722         return ret;
3723 }
3724 EXPORT_SYMBOL(rdma_disconnect);
3725
3726 static int cma_ib_mc_handler(int status, struct ib_sa_multicast *multicast)
3727 {
3728         struct rdma_id_private *id_priv;
3729         struct cma_multicast *mc = multicast->context;
3730         struct rdma_cm_event event;
3731         int ret = 0;
3732
3733         id_priv = mc->id_priv;
3734         mutex_lock(&id_priv->handler_mutex);
3735         if (id_priv->state != RDMA_CM_ADDR_BOUND &&
3736             id_priv->state != RDMA_CM_ADDR_RESOLVED)
3737                 goto out;
3738
3739         if (!status)
3740                 status = cma_set_qkey(id_priv, be32_to_cpu(multicast->rec.qkey));
3741         mutex_lock(&id_priv->qp_mutex);
3742         if (!status && id_priv->id.qp)
3743                 status = ib_attach_mcast(id_priv->id.qp, &multicast->rec.mgid,
3744                                          be16_to_cpu(multicast->rec.mlid));
3745         mutex_unlock(&id_priv->qp_mutex);
3746
3747         memset(&event, 0, sizeof event);
3748         event.status = status;
3749         event.param.ud.private_data = mc->context;
3750         if (!status) {
3751                 struct rdma_dev_addr *dev_addr =
3752                         &id_priv->id.route.addr.dev_addr;
3753                 struct net_device *ndev =
3754                         dev_get_by_index(&init_net, dev_addr->bound_dev_if);
3755                 enum ib_gid_type gid_type =
3756                         id_priv->cma_dev->default_gid_type[id_priv->id.port_num -
3757                         rdma_start_port(id_priv->cma_dev->device)];
3758
3759                 event.event = RDMA_CM_EVENT_MULTICAST_JOIN;
3760                 ib_init_ah_from_mcmember(id_priv->id.device,
3761                                          id_priv->id.port_num, &multicast->rec,
3762                                          ndev, gid_type,
3763                                          &event.param.ud.ah_attr);
3764                 event.param.ud.qp_num = 0xFFFFFF;
3765                 event.param.ud.qkey = be32_to_cpu(multicast->rec.qkey);
3766                 if (ndev)
3767                         dev_put(ndev);
3768         } else
3769                 event.event = RDMA_CM_EVENT_MULTICAST_ERROR;
3770
3771         ret = id_priv->id.event_handler(&id_priv->id, &event);
3772         if (ret) {
3773                 cma_exch(id_priv, RDMA_CM_DESTROYING);
3774                 mutex_unlock(&id_priv->handler_mutex);
3775                 rdma_destroy_id(&id_priv->id);
3776                 return 0;
3777         }
3778
3779 out:
3780         mutex_unlock(&id_priv->handler_mutex);
3781         return 0;
3782 }
3783
3784 static void cma_set_mgid(struct rdma_id_private *id_priv,
3785                          struct sockaddr *addr, union ib_gid *mgid)
3786 {
3787         unsigned char mc_map[MAX_ADDR_LEN];
3788         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
3789         struct sockaddr_in *sin = (struct sockaddr_in *) addr;
3790         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) addr;
3791
3792         if (cma_any_addr(addr)) {
3793                 memset(mgid, 0, sizeof *mgid);
3794         } else if ((addr->sa_family == AF_INET6) &&
3795                    ((be32_to_cpu(sin6->sin6_addr.s6_addr32[0]) & 0xFFF0FFFF) ==
3796                                                                  0xFF10A01B)) {
3797                 /* IPv6 address is an SA assigned MGID. */
3798                 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
3799         } else if (addr->sa_family == AF_IB) {
3800                 memcpy(mgid, &((struct sockaddr_ib *) addr)->sib_addr, sizeof *mgid);
3801         } else if ((addr->sa_family == AF_INET6)) {
3802                 ipv6_ib_mc_map(&sin6->sin6_addr, dev_addr->broadcast, mc_map);
3803                 if (id_priv->id.ps == RDMA_PS_UDP)
3804                         mc_map[7] = 0x01;       /* Use RDMA CM signature */
3805                 *mgid = *(union ib_gid *) (mc_map + 4);
3806         } else {
3807                 ip_ib_mc_map(sin->sin_addr.s_addr, dev_addr->broadcast, mc_map);
3808                 if (id_priv->id.ps == RDMA_PS_UDP)
3809                         mc_map[7] = 0x01;       /* Use RDMA CM signature */
3810                 *mgid = *(union ib_gid *) (mc_map + 4);
3811         }
3812 }
3813
3814 static void cma_query_sa_classport_info_cb(int status,
3815                                            struct ib_class_port_info *rec,
3816                                            void *context)
3817 {
3818         struct class_port_info_context *cb_ctx = context;
3819
3820         WARN_ON(!context);
3821
3822         if (status || !rec) {
3823                 pr_debug("RDMA CM: %s port %u failed query ClassPortInfo status: %d\n",
3824                          cb_ctx->device->name, cb_ctx->port_num, status);
3825                 goto out;
3826         }
3827
3828         memcpy(cb_ctx->class_port_info, rec, sizeof(struct ib_class_port_info));
3829
3830 out:
3831         complete(&cb_ctx->done);
3832 }
3833
3834 static int cma_query_sa_classport_info(struct ib_device *device, u8 port_num,
3835                                        struct ib_class_port_info *class_port_info)
3836 {
3837         struct class_port_info_context *cb_ctx;
3838         int ret;
3839
3840         cb_ctx = kmalloc(sizeof(*cb_ctx), GFP_KERNEL);
3841         if (!cb_ctx)
3842                 return -ENOMEM;
3843
3844         cb_ctx->device = device;
3845         cb_ctx->class_port_info = class_port_info;
3846         cb_ctx->port_num = port_num;
3847         init_completion(&cb_ctx->done);
3848
3849         ret = ib_sa_classport_info_rec_query(&sa_client, device, port_num,
3850                                              CMA_QUERY_CLASSPORT_INFO_TIMEOUT,
3851                                              GFP_KERNEL, cma_query_sa_classport_info_cb,
3852                                              cb_ctx, &cb_ctx->sa_query);
3853         if (ret < 0) {
3854                 pr_err("RDMA CM: %s port %u failed to send ClassPortInfo query, ret: %d\n",
3855                        device->name, port_num, ret);
3856                 goto out;
3857         }
3858
3859         wait_for_completion(&cb_ctx->done);
3860
3861 out:
3862         kfree(cb_ctx);
3863         return ret;
3864 }
3865
3866 static int cma_join_ib_multicast(struct rdma_id_private *id_priv,
3867                                  struct cma_multicast *mc)
3868 {
3869         struct ib_sa_mcmember_rec rec;
3870         struct ib_class_port_info class_port_info;
3871         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
3872         ib_sa_comp_mask comp_mask;
3873         int ret;
3874
3875         ib_addr_get_mgid(dev_addr, &rec.mgid);
3876         ret = ib_sa_get_mcmember_rec(id_priv->id.device, id_priv->id.port_num,
3877                                      &rec.mgid, &rec);
3878         if (ret)
3879                 return ret;
3880
3881         ret = cma_set_qkey(id_priv, 0);
3882         if (ret)
3883                 return ret;
3884
3885         cma_set_mgid(id_priv, (struct sockaddr *) &mc->addr, &rec.mgid);
3886         rec.qkey = cpu_to_be32(id_priv->qkey);
3887         rdma_addr_get_sgid(dev_addr, &rec.port_gid);
3888         rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
3889         rec.join_state = mc->join_state;
3890
3891         if (rec.join_state == BIT(SENDONLY_FULLMEMBER_JOIN)) {
3892                 ret = cma_query_sa_classport_info(id_priv->id.device,
3893                                                   id_priv->id.port_num,
3894                                                   &class_port_info);
3895
3896                 if (ret)
3897                         return ret;
3898
3899                 if (!(ib_get_cpi_capmask2(&class_port_info) &
3900                       IB_SA_CAP_MASK2_SENDONLY_FULL_MEM_SUPPORT)) {
3901                         pr_warn("RDMA CM: %s port %u Unable to multicast join\n"
3902                                 "RDMA CM: SM doesn't support Send Only Full Member option\n",
3903                                 id_priv->id.device->name, id_priv->id.port_num);
3904                         return -EOPNOTSUPP;
3905                 }
3906         }
3907
3908         comp_mask = IB_SA_MCMEMBER_REC_MGID | IB_SA_MCMEMBER_REC_PORT_GID |
3909                     IB_SA_MCMEMBER_REC_PKEY | IB_SA_MCMEMBER_REC_JOIN_STATE |
3910                     IB_SA_MCMEMBER_REC_QKEY | IB_SA_MCMEMBER_REC_SL |
3911                     IB_SA_MCMEMBER_REC_FLOW_LABEL |
3912                     IB_SA_MCMEMBER_REC_TRAFFIC_CLASS;
3913
3914         if (id_priv->id.ps == RDMA_PS_IPOIB)
3915                 comp_mask |= IB_SA_MCMEMBER_REC_RATE |
3916                              IB_SA_MCMEMBER_REC_RATE_SELECTOR |
3917                              IB_SA_MCMEMBER_REC_MTU_SELECTOR |
3918                              IB_SA_MCMEMBER_REC_MTU |
3919                              IB_SA_MCMEMBER_REC_HOP_LIMIT;
3920
3921         mc->multicast.ib = ib_sa_join_multicast(&sa_client, id_priv->id.device,
3922                                                 id_priv->id.port_num, &rec,
3923                                                 comp_mask, GFP_KERNEL,
3924                                                 cma_ib_mc_handler, mc);
3925         return PTR_ERR_OR_ZERO(mc->multicast.ib);
3926 }
3927
3928 static void iboe_mcast_work_handler(struct work_struct *work)
3929 {
3930         struct iboe_mcast_work *mw = container_of(work, struct iboe_mcast_work, work);
3931         struct cma_multicast *mc = mw->mc;
3932         struct ib_sa_multicast *m = mc->multicast.ib;
3933
3934         mc->multicast.ib->context = mc;
3935         cma_ib_mc_handler(0, m);
3936         kref_put(&mc->mcref, release_mc);
3937         kfree(mw);
3938 }
3939
3940 static void cma_iboe_set_mgid(struct sockaddr *addr, union ib_gid *mgid)
3941 {
3942         struct sockaddr_in *sin = (struct sockaddr_in *)addr;
3943         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr;
3944
3945         if (cma_any_addr(addr)) {
3946                 memset(mgid, 0, sizeof *mgid);
3947         } else if (addr->sa_family == AF_INET6) {
3948                 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
3949         } else {
3950                 mgid->raw[0] = 0xff;
3951                 mgid->raw[1] = 0x0e;
3952                 mgid->raw[2] = 0;
3953                 mgid->raw[3] = 0;
3954                 mgid->raw[4] = 0;
3955                 mgid->raw[5] = 0;
3956                 mgid->raw[6] = 0;
3957                 mgid->raw[7] = 0;
3958                 mgid->raw[8] = 0;
3959                 mgid->raw[9] = 0;
3960                 mgid->raw[10] = 0xff;
3961                 mgid->raw[11] = 0xff;
3962                 *(__be32 *)(&mgid->raw[12]) = sin->sin_addr.s_addr;
3963         }
3964 }
3965
3966 static int cma_iboe_join_multicast(struct rdma_id_private *id_priv,
3967                                    struct cma_multicast *mc)
3968 {
3969         struct iboe_mcast_work *work;
3970         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
3971         int err = 0;
3972         struct sockaddr *addr = (struct sockaddr *)&mc->addr;
3973         struct net_device *ndev = NULL;
3974         enum ib_gid_type gid_type;
3975         bool send_only;
3976
3977         send_only = mc->join_state == BIT(SENDONLY_FULLMEMBER_JOIN);
3978
3979         if (cma_zero_addr((struct sockaddr *)&mc->addr))
3980                 return -EINVAL;
3981
3982         work = kzalloc(sizeof *work, GFP_KERNEL);
3983         if (!work)
3984                 return -ENOMEM;
3985
3986         mc->multicast.ib = kzalloc(sizeof(struct ib_sa_multicast), GFP_KERNEL);
3987         if (!mc->multicast.ib) {
3988                 err = -ENOMEM;
3989                 goto out1;
3990         }
3991
3992         cma_iboe_set_mgid(addr, &mc->multicast.ib->rec.mgid);
3993
3994         mc->multicast.ib->rec.pkey = cpu_to_be16(0xffff);
3995         if (id_priv->id.ps == RDMA_PS_UDP)
3996                 mc->multicast.ib->rec.qkey = cpu_to_be32(RDMA_UDP_QKEY);
3997
3998         if (dev_addr->bound_dev_if)
3999                 ndev = dev_get_by_index(&init_net, dev_addr->bound_dev_if);
4000         if (!ndev) {
4001                 err = -ENODEV;
4002                 goto out2;
4003         }
4004         mc->multicast.ib->rec.rate = iboe_get_rate(ndev);
4005         mc->multicast.ib->rec.hop_limit = 1;
4006         mc->multicast.ib->rec.mtu = iboe_get_mtu(ndev->mtu);
4007
4008         gid_type = id_priv->cma_dev->default_gid_type[id_priv->id.port_num -
4009                    rdma_start_port(id_priv->cma_dev->device)];
4010         if (addr->sa_family == AF_INET) {
4011                 if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) {
4012                         mc->multicast.ib->rec.hop_limit = IPV6_DEFAULT_HOPLIMIT;
4013                         if (!send_only) {
4014                                 err = cma_igmp_send(ndev, &mc->multicast.ib->rec.mgid,
4015                                                     true);
4016                                 if (!err)
4017                                         mc->igmp_joined = true;
4018                         }
4019                 }
4020         } else {
4021                 if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP)
4022                         err = -ENOTSUPP;
4023         }
4024         dev_put(ndev);
4025         if (err || !mc->multicast.ib->rec.mtu) {
4026                 if (!err)
4027                         err = -EINVAL;
4028                 goto out2;
4029         }
4030         rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
4031                     &mc->multicast.ib->rec.port_gid);
4032         work->id = id_priv;
4033         work->mc = mc;
4034         INIT_WORK(&work->work, iboe_mcast_work_handler);
4035         kref_get(&mc->mcref);
4036         queue_work(cma_wq, &work->work);
4037
4038         return 0;
4039
4040 out2:
4041         kfree(mc->multicast.ib);
4042 out1:
4043         kfree(work);
4044         return err;
4045 }
4046
4047 int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
4048                         u8 join_state, void *context)
4049 {
4050         struct rdma_id_private *id_priv;
4051         struct cma_multicast *mc;
4052         int ret;
4053
4054         if (!id->device)
4055                 return -EINVAL;
4056
4057         id_priv = container_of(id, struct rdma_id_private, id);
4058         if (!cma_comp(id_priv, RDMA_CM_ADDR_BOUND) &&
4059             !cma_comp(id_priv, RDMA_CM_ADDR_RESOLVED))
4060                 return -EINVAL;
4061
4062         mc = kmalloc(sizeof *mc, GFP_KERNEL);
4063         if (!mc)
4064                 return -ENOMEM;
4065
4066         memcpy(&mc->addr, addr, rdma_addr_size(addr));
4067         mc->context = context;
4068         mc->id_priv = id_priv;
4069         mc->igmp_joined = false;
4070         mc->join_state = join_state;
4071         spin_lock(&id_priv->lock);
4072         list_add(&mc->list, &id_priv->mc_list);
4073         spin_unlock(&id_priv->lock);
4074
4075         if (rdma_protocol_roce(id->device, id->port_num)) {
4076                 kref_init(&mc->mcref);
4077                 ret = cma_iboe_join_multicast(id_priv, mc);
4078         } else if (rdma_cap_ib_mcast(id->device, id->port_num))
4079                 ret = cma_join_ib_multicast(id_priv, mc);
4080         else
4081                 ret = -ENOSYS;
4082
4083         if (ret) {
4084                 spin_lock_irq(&id_priv->lock);
4085                 list_del(&mc->list);
4086                 spin_unlock_irq(&id_priv->lock);
4087                 kfree(mc);
4088         }
4089         return ret;
4090 }
4091 EXPORT_SYMBOL(rdma_join_multicast);
4092
4093 void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr)
4094 {
4095         struct rdma_id_private *id_priv;
4096         struct cma_multicast *mc;
4097
4098         id_priv = container_of(id, struct rdma_id_private, id);
4099         spin_lock_irq(&id_priv->lock);
4100         list_for_each_entry(mc, &id_priv->mc_list, list) {
4101                 if (!memcmp(&mc->addr, addr, rdma_addr_size(addr))) {
4102                         list_del(&mc->list);
4103                         spin_unlock_irq(&id_priv->lock);
4104
4105                         if (id->qp)
4106                                 ib_detach_mcast(id->qp,
4107                                                 &mc->multicast.ib->rec.mgid,
4108                                                 be16_to_cpu(mc->multicast.ib->rec.mlid));
4109
4110                         BUG_ON(id_priv->cma_dev->device != id->device);
4111
4112                         if (rdma_cap_ib_mcast(id->device, id->port_num)) {
4113                                 ib_sa_free_multicast(mc->multicast.ib);
4114                                 kfree(mc);
4115                         } else if (rdma_protocol_roce(id->device, id->port_num)) {
4116                                 if (mc->igmp_joined) {
4117                                         struct rdma_dev_addr *dev_addr =
4118                                                 &id->route.addr.dev_addr;
4119                                         struct net_device *ndev = NULL;
4120
4121                                         if (dev_addr->bound_dev_if)
4122                                                 ndev = dev_get_by_index(&init_net,
4123                                                                         dev_addr->bound_dev_if);
4124                                         if (ndev) {
4125                                                 cma_igmp_send(ndev,
4126                                                               &mc->multicast.ib->rec.mgid,
4127                                                               false);
4128                                                 dev_put(ndev);
4129                                         }
4130                                         mc->igmp_joined = false;
4131                                 }
4132                                 kref_put(&mc->mcref, release_mc);
4133                         }
4134                         return;
4135                 }
4136         }
4137         spin_unlock_irq(&id_priv->lock);
4138 }
4139 EXPORT_SYMBOL(rdma_leave_multicast);
4140
4141 static int cma_netdev_change(struct net_device *ndev, struct rdma_id_private *id_priv)
4142 {
4143         struct rdma_dev_addr *dev_addr;
4144         struct cma_ndev_work *work;
4145
4146         dev_addr = &id_priv->id.route.addr.dev_addr;
4147
4148         if ((dev_addr->bound_dev_if == ndev->ifindex) &&
4149             (net_eq(dev_net(ndev), dev_addr->net)) &&
4150             memcmp(dev_addr->src_dev_addr, ndev->dev_addr, ndev->addr_len)) {
4151                 pr_info("RDMA CM addr change for ndev %s used by id %p\n",
4152                         ndev->name, &id_priv->id);
4153                 work = kzalloc(sizeof *work, GFP_KERNEL);
4154                 if (!work)
4155                         return -ENOMEM;
4156
4157                 INIT_WORK(&work->work, cma_ndev_work_handler);
4158                 work->id = id_priv;
4159                 work->event.event = RDMA_CM_EVENT_ADDR_CHANGE;
4160                 atomic_inc(&id_priv->refcount);
4161                 queue_work(cma_wq, &work->work);
4162         }
4163
4164         return 0;
4165 }
4166
4167 static int cma_netdev_callback(struct notifier_block *self, unsigned long event,
4168                                void *ptr)
4169 {
4170         struct net_device *ndev = netdev_notifier_info_to_dev(ptr);
4171         struct cma_device *cma_dev;
4172         struct rdma_id_private *id_priv;
4173         int ret = NOTIFY_DONE;
4174
4175         if (event != NETDEV_BONDING_FAILOVER)
4176                 return NOTIFY_DONE;
4177
4178         if (!(ndev->flags & IFF_MASTER) || !(ndev->priv_flags & IFF_BONDING))
4179                 return NOTIFY_DONE;
4180
4181         mutex_lock(&lock);
4182         list_for_each_entry(cma_dev, &dev_list, list)
4183                 list_for_each_entry(id_priv, &cma_dev->id_list, list) {
4184                         ret = cma_netdev_change(ndev, id_priv);
4185                         if (ret)
4186                                 goto out;
4187                 }
4188
4189 out:
4190         mutex_unlock(&lock);
4191         return ret;
4192 }
4193
4194 static struct notifier_block cma_nb = {
4195         .notifier_call = cma_netdev_callback
4196 };
4197
4198 static void cma_add_one(struct ib_device *device)
4199 {
4200         struct cma_device *cma_dev;
4201         struct rdma_id_private *id_priv;
4202         unsigned int i;
4203         unsigned long supported_gids = 0;
4204
4205         cma_dev = kmalloc(sizeof *cma_dev, GFP_KERNEL);
4206         if (!cma_dev)
4207                 return;
4208
4209         cma_dev->device = device;
4210         cma_dev->default_gid_type = kcalloc(device->phys_port_cnt,
4211                                             sizeof(*cma_dev->default_gid_type),
4212                                             GFP_KERNEL);
4213         if (!cma_dev->default_gid_type) {
4214                 kfree(cma_dev);
4215                 return;
4216         }
4217         for (i = rdma_start_port(device); i <= rdma_end_port(device); i++) {
4218                 supported_gids = roce_gid_type_mask_support(device, i);
4219                 WARN_ON(!supported_gids);
4220                 cma_dev->default_gid_type[i - rdma_start_port(device)] =
4221                         find_first_bit(&supported_gids, BITS_PER_LONG);
4222         }
4223
4224         init_completion(&cma_dev->comp);
4225         atomic_set(&cma_dev->refcount, 1);
4226         INIT_LIST_HEAD(&cma_dev->id_list);
4227         ib_set_client_data(device, &cma_client, cma_dev);
4228
4229         mutex_lock(&lock);
4230         list_add_tail(&cma_dev->list, &dev_list);
4231         list_for_each_entry(id_priv, &listen_any_list, list)
4232                 cma_listen_on_dev(id_priv, cma_dev);
4233         mutex_unlock(&lock);
4234 }
4235
4236 static int cma_remove_id_dev(struct rdma_id_private *id_priv)
4237 {
4238         struct rdma_cm_event event;
4239         enum rdma_cm_state state;
4240         int ret = 0;
4241
4242         /* Record that we want to remove the device */
4243         state = cma_exch(id_priv, RDMA_CM_DEVICE_REMOVAL);
4244         if (state == RDMA_CM_DESTROYING)
4245                 return 0;
4246
4247         cma_cancel_operation(id_priv, state);
4248         mutex_lock(&id_priv->handler_mutex);
4249
4250         /* Check for destruction from another callback. */
4251         if (!cma_comp(id_priv, RDMA_CM_DEVICE_REMOVAL))
4252                 goto out;
4253
4254         memset(&event, 0, sizeof event);
4255         event.event = RDMA_CM_EVENT_DEVICE_REMOVAL;
4256         ret = id_priv->id.event_handler(&id_priv->id, &event);
4257 out:
4258         mutex_unlock(&id_priv->handler_mutex);
4259         return ret;
4260 }
4261
4262 static void cma_process_remove(struct cma_device *cma_dev)
4263 {
4264         struct rdma_id_private *id_priv;
4265         int ret;
4266
4267         mutex_lock(&lock);
4268         while (!list_empty(&cma_dev->id_list)) {
4269                 id_priv = list_entry(cma_dev->id_list.next,
4270                                      struct rdma_id_private, list);
4271
4272                 list_del(&id_priv->listen_list);
4273                 list_del_init(&id_priv->list);
4274                 atomic_inc(&id_priv->refcount);
4275                 mutex_unlock(&lock);
4276
4277                 ret = id_priv->internal_id ? 1 : cma_remove_id_dev(id_priv);
4278                 cma_deref_id(id_priv);
4279                 if (ret)
4280                         rdma_destroy_id(&id_priv->id);
4281
4282                 mutex_lock(&lock);
4283         }
4284         mutex_unlock(&lock);
4285
4286         cma_deref_dev(cma_dev);
4287         wait_for_completion(&cma_dev->comp);
4288 }
4289
4290 static void cma_remove_one(struct ib_device *device, void *client_data)
4291 {
4292         struct cma_device *cma_dev = client_data;
4293
4294         if (!cma_dev)
4295                 return;
4296
4297         mutex_lock(&lock);
4298         list_del(&cma_dev->list);
4299         mutex_unlock(&lock);
4300
4301         cma_process_remove(cma_dev);
4302         kfree(cma_dev->default_gid_type);
4303         kfree(cma_dev);
4304 }
4305
4306 static int cma_get_id_stats(struct sk_buff *skb, struct netlink_callback *cb)
4307 {
4308         struct nlmsghdr *nlh;
4309         struct rdma_cm_id_stats *id_stats;
4310         struct rdma_id_private *id_priv;
4311         struct rdma_cm_id *id = NULL;
4312         struct cma_device *cma_dev;
4313         int i_dev = 0, i_id = 0;
4314
4315         /*
4316          * We export all of the IDs as a sequence of messages.  Each
4317          * ID gets its own netlink message.
4318          */
4319         mutex_lock(&lock);
4320
4321         list_for_each_entry(cma_dev, &dev_list, list) {
4322                 if (i_dev < cb->args[0]) {
4323                         i_dev++;
4324                         continue;
4325                 }
4326
4327                 i_id = 0;
4328                 list_for_each_entry(id_priv, &cma_dev->id_list, list) {
4329                         if (i_id < cb->args[1]) {
4330                                 i_id++;
4331                                 continue;
4332                         }
4333
4334                         id_stats = ibnl_put_msg(skb, &nlh, cb->nlh->nlmsg_seq,
4335                                                 sizeof *id_stats, RDMA_NL_RDMA_CM,
4336                                                 RDMA_NL_RDMA_CM_ID_STATS,
4337                                                 NLM_F_MULTI);
4338                         if (!id_stats)
4339                                 goto out;
4340
4341                         memset(id_stats, 0, sizeof *id_stats);
4342                         id = &id_priv->id;
4343                         id_stats->node_type = id->route.addr.dev_addr.dev_type;
4344                         id_stats->port_num = id->port_num;
4345                         id_stats->bound_dev_if =
4346                                 id->route.addr.dev_addr.bound_dev_if;
4347
4348                         if (ibnl_put_attr(skb, nlh,
4349                                           rdma_addr_size(cma_src_addr(id_priv)),
4350                                           cma_src_addr(id_priv),
4351                                           RDMA_NL_RDMA_CM_ATTR_SRC_ADDR))
4352                                 goto out;
4353                         if (ibnl_put_attr(skb, nlh,
4354                                           rdma_addr_size(cma_dst_addr(id_priv)),
4355                                           cma_dst_addr(id_priv),
4356                                           RDMA_NL_RDMA_CM_ATTR_DST_ADDR))
4357                                 goto out;
4358
4359                         id_stats->pid           = id_priv->owner;
4360                         id_stats->port_space    = id->ps;
4361                         id_stats->cm_state      = id_priv->state;
4362                         id_stats->qp_num        = id_priv->qp_num;
4363                         id_stats->qp_type       = id->qp_type;
4364
4365                         i_id++;
4366                 }
4367
4368                 cb->args[1] = 0;
4369                 i_dev++;
4370         }
4371
4372 out:
4373         mutex_unlock(&lock);
4374         cb->args[0] = i_dev;
4375         cb->args[1] = i_id;
4376
4377         return skb->len;
4378 }
4379
4380 static const struct ibnl_client_cbs cma_cb_table[] = {
4381         [RDMA_NL_RDMA_CM_ID_STATS] = { .dump = cma_get_id_stats,
4382                                        .module = THIS_MODULE },
4383 };
4384
4385 static int cma_init_net(struct net *net)
4386 {
4387         struct cma_pernet *pernet = cma_pernet(net);
4388
4389         idr_init(&pernet->tcp_ps);
4390         idr_init(&pernet->udp_ps);
4391         idr_init(&pernet->ipoib_ps);
4392         idr_init(&pernet->ib_ps);
4393
4394         return 0;
4395 }
4396
4397 static void cma_exit_net(struct net *net)
4398 {
4399         struct cma_pernet *pernet = cma_pernet(net);
4400
4401         idr_destroy(&pernet->tcp_ps);
4402         idr_destroy(&pernet->udp_ps);
4403         idr_destroy(&pernet->ipoib_ps);
4404         idr_destroy(&pernet->ib_ps);
4405 }
4406
4407 static struct pernet_operations cma_pernet_operations = {
4408         .init = cma_init_net,
4409         .exit = cma_exit_net,
4410         .id = &cma_pernet_id,
4411         .size = sizeof(struct cma_pernet),
4412 };
4413
4414 static int __init cma_init(void)
4415 {
4416         int ret;
4417
4418         cma_wq = alloc_ordered_workqueue("rdma_cm", WQ_MEM_RECLAIM);
4419         if (!cma_wq)
4420                 return -ENOMEM;
4421
4422         ret = register_pernet_subsys(&cma_pernet_operations);
4423         if (ret)
4424                 goto err_wq;
4425
4426         ib_sa_register_client(&sa_client);
4427         rdma_addr_register_client(&addr_client);
4428         register_netdevice_notifier(&cma_nb);
4429
4430         ret = ib_register_client(&cma_client);
4431         if (ret)
4432                 goto err;
4433
4434         if (ibnl_add_client(RDMA_NL_RDMA_CM, ARRAY_SIZE(cma_cb_table),
4435                             cma_cb_table))
4436                 pr_warn("RDMA CMA: failed to add netlink callback\n");
4437         cma_configfs_init();
4438
4439         return 0;
4440
4441 err:
4442         unregister_netdevice_notifier(&cma_nb);
4443         rdma_addr_unregister_client(&addr_client);
4444         ib_sa_unregister_client(&sa_client);
4445         unregister_pernet_subsys(&cma_pernet_operations);
4446 err_wq:
4447         destroy_workqueue(cma_wq);
4448         return ret;
4449 }
4450
4451 static void __exit cma_cleanup(void)
4452 {
4453         cma_configfs_exit();
4454         ibnl_remove_client(RDMA_NL_RDMA_CM);
4455         ib_unregister_client(&cma_client);
4456         unregister_netdevice_notifier(&cma_nb);
4457         rdma_addr_unregister_client(&addr_client);
4458         ib_sa_unregister_client(&sa_client);
4459         unregister_pernet_subsys(&cma_pernet_operations);
4460         destroy_workqueue(cma_wq);
4461 }
4462
4463 module_init(cma_init);
4464 module_exit(cma_cleanup);