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