drivers/infiniband/core/cma.c

   1 /*
   2  * Copyright (c) 2005 Voltaire Inc.  All rights reserved.
   3  * Copyright (c) 2002-2005, Network Appliance, Inc. All rights reserved.
   4  * Copyright (c) 1999-2005, Mellanox Technologies, Inc. All rights reserved.
   5  * Copyright (c) 2005-2006 Intel Corporation.  All rights reserved.
   6  *
   7  * This software is available to you under a choice of one of two
   8  * licenses.  You may choose to be licensed under the terms of the GNU
   9  * General Public License (GPL) Version 2, available from the file
  10  * COPYING in the main directory of this source tree, or the
  11  * OpenIB.org BSD license below:
  12  *
  13  *     Redistribution and use in source and binary forms, with or
  14  *     without modification, are permitted provided that the following
  15  *     conditions are met:
  16  *
  17  *      - Redistributions of source code must retain the above
  18  *        copyright notice, this list of conditions and the following
  19  *        disclaimer.
  20  *
  21  *      - Redistributions in binary form must reproduce the above
  22  *        copyright notice, this list of conditions and the following
  23  *        disclaimer in the documentation and/or other materials
  24  *        provided with the distribution.
  25  *
  26  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  27  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  28  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  29  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  30  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  31  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  32  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  33  * SOFTWARE.
  34  */
  35
  36 #include <linux/completion.h>
  37 #include <linux/in.h>
  38 #include <linux/in6.h>
  39 #include <linux/mutex.h>
  40 #include <linux/random.h>
  41 #include <linux/igmp.h>
  42 #include <linux/xarray.h>
  43 #include <linux/inetdevice.h>
  44 #include <linux/slab.h>
  45 #include <linux/module.h>
  46 #include <net/route.h>
  47
  48 #include <net/net_namespace.h>
  49 #include <net/netns/generic.h>
  50 #include <net/tcp.h>
  51 #include <net/ipv6.h>
  52 #include <net/ip_fib.h>
  53 #include <net/ip6_route.h>
  54
  55 #include <rdma/rdma_cm.h>
  56 #include <rdma/rdma_cm_ib.h>
  57 #include <rdma/rdma_netlink.h>
  58 #include <rdma/ib.h>
  59 #include <rdma/ib_cache.h>
  60 #include <rdma/ib_cm.h>
  61 #include <rdma/ib_sa.h>
  62 #include <rdma/iw_cm.h>
  63
  64 #include "core_priv.h"
  65 #include "cma_priv.h"
  66
  67 MODULE_AUTHOR("Sean Hefty");
  68 MODULE_DESCRIPTION("Generic RDMA CM Agent");
  69 MODULE_LICENSE("Dual BSD/GPL");
  70
  71 #define CMA_CM_RESPONSE_TIMEOUT 20
  72 #define CMA_QUERY_CLASSPORT_INFO_TIMEOUT 3000
  73 #define CMA_MAX_CM_RETRIES 15
  74 #define CMA_CM_MRA_SETTING (IB_CM_MRA_FLAG_DELAY | 24)
  75 #define CMA_IBOE_PACKET_LIFETIME 18
  76 #define CMA_PREFERRED_ROCE_GID_TYPE IB_GID_TYPE_ROCE_UDP_ENCAP
  77
  78 static const char * const cma_events[] = {
  79         [RDMA_CM_EVENT_ADDR_RESOLVED]    = "address resolved",
  80         [RDMA_CM_EVENT_ADDR_ERROR]       = "address error",
  81         [RDMA_CM_EVENT_ROUTE_RESOLVED]   = "route resolved ",
  82         [RDMA_CM_EVENT_ROUTE_ERROR]      = "route error",
  83         [RDMA_CM_EVENT_CONNECT_REQUEST]  = "connect request",
  84         [RDMA_CM_EVENT_CONNECT_RESPONSE] = "connect response",
  85         [RDMA_CM_EVENT_CONNECT_ERROR]    = "connect error",
  86         [RDMA_CM_EVENT_UNREACHABLE]      = "unreachable",
  87         [RDMA_CM_EVENT_REJECTED]         = "rejected",
  88         [RDMA_CM_EVENT_ESTABLISHED]      = "established",
  89         [RDMA_CM_EVENT_DISCONNECTED]     = "disconnected",
  90         [RDMA_CM_EVENT_DEVICE_REMOVAL]   = "device removal",
  91         [RDMA_CM_EVENT_MULTICAST_JOIN]   = "multicast join",
  92         [RDMA_CM_EVENT_MULTICAST_ERROR]  = "multicast error",
  93         [RDMA_CM_EVENT_ADDR_CHANGE]      = "address change",
  94         [RDMA_CM_EVENT_TIMEWAIT_EXIT]    = "timewait exit",
  95 };
  96
  97 const char *__attribute_const__ rdma_event_msg(enum rdma_cm_event_type event)
  98 {
  99         size_t index = event;
 100
 101         return (index < ARRAY_SIZE(cma_events) && cma_events[index]) ?
 102                         cma_events[index] : "unrecognized event";
 103 }
 104 EXPORT_SYMBOL(rdma_event_msg);
 105
 106 const char *__attribute_const__ rdma_reject_msg(struct rdma_cm_id *id,
 107                                                 int reason)
 108 {
 109         if (rdma_ib_or_roce(id->device, id->port_num))
 110                 return ibcm_reject_msg(reason);
 111
 112         if (rdma_protocol_iwarp(id->device, id->port_num))
 113                 return iwcm_reject_msg(reason);
 114
 115         WARN_ON_ONCE(1);
 116         return "unrecognized transport";
 117 }
 118 EXPORT_SYMBOL(rdma_reject_msg);
 119
 120 bool rdma_is_consumer_reject(struct rdma_cm_id *id, int reason)
 121 {
 122         if (rdma_ib_or_roce(id->device, id->port_num))
 123                 return reason == IB_CM_REJ_CONSUMER_DEFINED;
 124
 125         if (rdma_protocol_iwarp(id->device, id->port_num))
 126                 return reason == -ECONNREFUSED;
 127
 128         WARN_ON_ONCE(1);
 129         return false;
 130 }
 131 EXPORT_SYMBOL(rdma_is_consumer_reject);
 132
 133 const void *rdma_consumer_reject_data(struct rdma_cm_id *id,
 134                                       struct rdma_cm_event *ev, u8 *data_len)
 135 {
 136         const void *p;
 137
 138         if (rdma_is_consumer_reject(id, ev->status)) {
 139                 *data_len = ev->param.conn.private_data_len;
 140                 p = ev->param.conn.private_data;
 141         } else {
 142                 *data_len = 0;
 143                 p = NULL;
 144         }
 145         return p;
 146 }
 147 EXPORT_SYMBOL(rdma_consumer_reject_data);
 148
 149 /**
 150  * rdma_iw_cm_id() - return the iw_cm_id pointer for this cm_id.
 151  * @id: Communication Identifier
 152  */
 153 struct iw_cm_id *rdma_iw_cm_id(struct rdma_cm_id *id)
 154 {
 155         struct rdma_id_private *id_priv;
 156
 157         id_priv = container_of(id, struct rdma_id_private, id);
 158         if (id->device->node_type == RDMA_NODE_RNIC)
 159                 return id_priv->cm_id.iw;
 160         return NULL;
 161 }
 162 EXPORT_SYMBOL(rdma_iw_cm_id);
 163
 164 /**
 165  * rdma_res_to_id() - return the rdma_cm_id pointer for this restrack.
 166  * @res: rdma resource tracking entry pointer
 167  */
 168 struct rdma_cm_id *rdma_res_to_id(struct rdma_restrack_entry *res)
 169 {
 170         struct rdma_id_private *id_priv =
 171                 container_of(res, struct rdma_id_private, res);
 172
 173         return &id_priv->id;
 174 }
 175 EXPORT_SYMBOL(rdma_res_to_id);
 176
 177 static void cma_add_one(struct ib_device *device);
 178 static void cma_remove_one(struct ib_device *device, void *client_data);
 179
 180 static struct ib_client cma_client = {
 181         .name   = "cma",
 182         .add    = cma_add_one,
 183         .remove = cma_remove_one
 184 };
 185
 186 static struct ib_sa_client sa_client;
 187 static LIST_HEAD(dev_list);
 188 static LIST_HEAD(listen_any_list);
 189 static DEFINE_MUTEX(lock);
 190 static struct workqueue_struct *cma_wq;
 191 static unsigned int cma_pernet_id;
 192
 193 struct cma_pernet {
 194         struct xarray tcp_ps;
 195         struct xarray udp_ps;
 196         struct xarray ipoib_ps;
 197         struct xarray ib_ps;
 198 };
 199
 200 static struct cma_pernet *cma_pernet(struct net *net)
 201 {
 202         return net_generic(net, cma_pernet_id);
 203 }
 204
 205 static
 206 struct xarray *cma_pernet_xa(struct net *net, enum rdma_ucm_port_space ps)
 207 {
 208         struct cma_pernet *pernet = cma_pernet(net);
 209
 210         switch (ps) {
 211         case RDMA_PS_TCP:
 212                 return &pernet->tcp_ps;
 213         case RDMA_PS_UDP:
 214                 return &pernet->udp_ps;
 215         case RDMA_PS_IPOIB:
 216                 return &pernet->ipoib_ps;
 217         case RDMA_PS_IB:
 218                 return &pernet->ib_ps;
 219         default:
 220                 return NULL;
 221         }
 222 }
 223
 224 struct cma_device {
 225         struct list_head        list;
 226         struct ib_device        *device;
 227         struct completion       comp;
 228         atomic_t                refcount;
 229         struct list_head        id_list;
 230         enum ib_gid_type        *default_gid_type;
 231         u8                      *default_roce_tos;
 232 };
 233
 234 struct rdma_bind_list {
 235         enum rdma_ucm_port_space ps;
 236         struct hlist_head       owners;
 237         unsigned short          port;
 238 };
 239
 240 struct class_port_info_context {
 241         struct ib_class_port_info       *class_port_info;
 242         struct ib_device                *device;
 243         struct completion               done;
 244         struct ib_sa_query              *sa_query;
 245         u8                              port_num;
 246 };
 247
 248 static int cma_ps_alloc(struct net *net, enum rdma_ucm_port_space ps,
 249                         struct rdma_bind_list *bind_list, int snum)
 250 {
 251         struct xarray *xa = cma_pernet_xa(net, ps);
 252
 253         return xa_insert(xa, snum, bind_list, GFP_KERNEL);
 254 }
 255
 256 static struct rdma_bind_list *cma_ps_find(struct net *net,
 257                                           enum rdma_ucm_port_space ps, int snum)
 258 {
 259         struct xarray *xa = cma_pernet_xa(net, ps);
 260
 261         return xa_load(xa, snum);
 262 }
 263
 264 static void cma_ps_remove(struct net *net, enum rdma_ucm_port_space ps,
 265                           int snum)
 266 {
 267         struct xarray *xa = cma_pernet_xa(net, ps);
 268
 269         xa_erase(xa, snum);
 270 }
 271
 272 enum {
 273         CMA_OPTION_AFONLY,
 274 };
 275
 276 void cma_ref_dev(struct cma_device *cma_dev)
 277 {
 278         atomic_inc(&cma_dev->refcount);
 279 }
 280
 281 struct cma_device *cma_enum_devices_by_ibdev(cma_device_filter  filter,
 282                                              void               *cookie)
 283 {
 284         struct cma_device *cma_dev;
 285         struct cma_device *found_cma_dev = NULL;
 286
 287         mutex_lock(&lock);
 288
 289         list_for_each_entry(cma_dev, &dev_list, list)
 290                 if (filter(cma_dev->device, cookie)) {
 291                         found_cma_dev = cma_dev;
 292                         break;
 293                 }
 294
 295         if (found_cma_dev)
 296                 cma_ref_dev(found_cma_dev);
 297         mutex_unlock(&lock);
 298         return found_cma_dev;
 299 }
 300
 301 int cma_get_default_gid_type(struct cma_device *cma_dev,
 302                              unsigned int port)
 303 {
 304         if (!rdma_is_port_valid(cma_dev->device, port))
 305                 return -EINVAL;
 306
 307         return cma_dev->default_gid_type[port - rdma_start_port(cma_dev->device)];
 308 }
 309
 310 int cma_set_default_gid_type(struct cma_device *cma_dev,
 311                              unsigned int port,
 312                              enum ib_gid_type default_gid_type)
 313 {
 314         unsigned long supported_gids;
 315
 316         if (!rdma_is_port_valid(cma_dev->device, port))
 317                 return -EINVAL;
 318
 319         supported_gids = roce_gid_type_mask_support(cma_dev->device, port);
 320
 321         if (!(supported_gids & 1 << default_gid_type))
 322                 return -EINVAL;
 323
 324         cma_dev->default_gid_type[port - rdma_start_port(cma_dev->device)] =
 325                 default_gid_type;
 326
 327         return 0;
 328 }
 329
 330 int cma_get_default_roce_tos(struct cma_device *cma_dev, unsigned int port)
 331 {
 332         if (!rdma_is_port_valid(cma_dev->device, port))
 333                 return -EINVAL;
 334
 335         return cma_dev->default_roce_tos[port - rdma_start_port(cma_dev->device)];
 336 }
 337
 338 int cma_set_default_roce_tos(struct cma_device *cma_dev, unsigned int port,
 339                              u8 default_roce_tos)
 340 {
 341         if (!rdma_is_port_valid(cma_dev->device, port))
 342                 return -EINVAL;
 343
 344         cma_dev->default_roce_tos[port - rdma_start_port(cma_dev->device)] =
 345                  default_roce_tos;
 346
 347         return 0;
 348 }
 349 struct ib_device *cma_get_ib_dev(struct cma_device *cma_dev)
 350 {
 351         return cma_dev->device;
 352 }
 353
 354 /*
 355  * Device removal can occur at anytime, so we need extra handling to
 356  * serialize notifying the user of device removal with other callbacks.
 357  * We do this by disabling removal notification while a callback is in process,
 358  * and reporting it after the callback completes.
 359  */
 360
 361 struct cma_multicast {
 362         struct rdma_id_private *id_priv;
 363         union {
 364                 struct ib_sa_multicast *ib;
 365         } multicast;
 366         struct list_head        list;
 367         void                    *context;
 368         struct sockaddr_storage addr;
 369         struct kref             mcref;
 370         u8                      join_state;
 371 };
 372
 373 struct cma_work {
 374         struct work_struct      work;
 375         struct rdma_id_private  *id;
 376         enum rdma_cm_state      old_state;
 377         enum rdma_cm_state      new_state;
 378         struct rdma_cm_event    event;
 379 };
 380
 381 struct cma_ndev_work {
 382         struct work_struct      work;
 383         struct rdma_id_private  *id;
 384         struct rdma_cm_event    event;
 385 };
 386
 387 struct iboe_mcast_work {
 388         struct work_struct       work;
 389         struct rdma_id_private  *id;
 390         struct cma_multicast    *mc;
 391 };
 392
 393 union cma_ip_addr {
 394         struct in6_addr ip6;
 395         struct {
 396                 __be32 pad[3];
 397                 __be32 addr;
 398         } ip4;
 399 };
 400
 401 struct cma_hdr {
 402         u8 cma_version;
 403         u8 ip_version;  /* IP version: 7:4 */
 404         __be16 port;
 405         union cma_ip_addr src_addr;
 406         union cma_ip_addr dst_addr;
 407 };
 408
 409 #define CMA_VERSION 0x00
 410
 411 struct cma_req_info {
 412         struct sockaddr_storage listen_addr_storage;
 413         struct sockaddr_storage src_addr_storage;
 414         struct ib_device *device;
 415         union ib_gid local_gid;
 416         __be64 service_id;
 417         int port;
 418         bool has_gid;
 419         u16 pkey;
 420 };
 421
 422 static int cma_comp(struct rdma_id_private *id_priv, enum rdma_cm_state comp)
 423 {
 424         unsigned long flags;
 425         int ret;
 426
 427         spin_lock_irqsave(&id_priv->lock, flags);
 428         ret = (id_priv->state == comp);
 429         spin_unlock_irqrestore(&id_priv->lock, flags);
 430         return ret;
 431 }
 432
 433 static int cma_comp_exch(struct rdma_id_private *id_priv,
 434                          enum rdma_cm_state comp, enum rdma_cm_state exch)
 435 {
 436         unsigned long flags;
 437         int ret;
 438
 439         spin_lock_irqsave(&id_priv->lock, flags);
 440         if ((ret = (id_priv->state == comp)))
 441                 id_priv->state = exch;
 442         spin_unlock_irqrestore(&id_priv->lock, flags);
 443         return ret;
 444 }
 445
 446 static enum rdma_cm_state cma_exch(struct rdma_id_private *id_priv,
 447                                    enum rdma_cm_state exch)
 448 {
 449         unsigned long flags;
 450         enum rdma_cm_state old;
 451
 452         spin_lock_irqsave(&id_priv->lock, flags);
 453         old = id_priv->state;
 454         id_priv->state = exch;
 455         spin_unlock_irqrestore(&id_priv->lock, flags);
 456         return old;
 457 }
 458
 459 static inline u8 cma_get_ip_ver(const struct cma_hdr *hdr)
 460 {
 461         return hdr->ip_version >> 4;
 462 }
 463
 464 static inline void cma_set_ip_ver(struct cma_hdr *hdr, u8 ip_ver)
 465 {
 466         hdr->ip_version = (ip_ver << 4) | (hdr->ip_version & 0xF);
 467 }
 468
 469 static int cma_igmp_send(struct net_device *ndev, union ib_gid *mgid, bool join)
 470 {
 471         struct in_device *in_dev = NULL;
 472
 473         if (ndev) {
 474                 rtnl_lock();
 475                 in_dev = __in_dev_get_rtnl(ndev);
 476                 if (in_dev) {
 477                         if (join)
 478                                 ip_mc_inc_group(in_dev,
 479                                                 *(__be32 *)(mgid->raw + 12));
 480                         else
 481                                 ip_mc_dec_group(in_dev,
 482                                                 *(__be32 *)(mgid->raw + 12));
 483                 }
 484                 rtnl_unlock();
 485         }
 486         return (in_dev) ? 0 : -ENODEV;
 487 }
 488
 489 static void _cma_attach_to_dev(struct rdma_id_private *id_priv,
 490                                struct cma_device *cma_dev)
 491 {
 492         cma_ref_dev(cma_dev);
 493         id_priv->cma_dev = cma_dev;
 494         id_priv->id.device = cma_dev->device;
 495         id_priv->id.route.addr.dev_addr.transport =
 496                 rdma_node_get_transport(cma_dev->device->node_type);
 497         list_add_tail(&id_priv->list, &cma_dev->id_list);
 498         if (id_priv->res.kern_name)
 499                 rdma_restrack_kadd(&id_priv->res);
 500         else
 501                 rdma_restrack_uadd(&id_priv->res);
 502 }
 503
 504 static void cma_attach_to_dev(struct rdma_id_private *id_priv,
 505                               struct cma_device *cma_dev)
 506 {
 507         _cma_attach_to_dev(id_priv, cma_dev);
 508         id_priv->gid_type =
 509                 cma_dev->default_gid_type[id_priv->id.port_num -
 510                                           rdma_start_port(cma_dev->device)];
 511 }
 512
 513 void cma_deref_dev(struct cma_device *cma_dev)
 514 {
 515         if (atomic_dec_and_test(&cma_dev->refcount))
 516                 complete(&cma_dev->comp);
 517 }
 518
 519 static inline void release_mc(struct kref *kref)
 520 {
 521         struct cma_multicast *mc = container_of(kref, struct cma_multicast, mcref);
 522
 523         kfree(mc->multicast.ib);
 524         kfree(mc);
 525 }
 526
 527 static void cma_release_dev(struct rdma_id_private *id_priv)
 528 {
 529         mutex_lock(&lock);
 530         list_del(&id_priv->list);
 531         cma_deref_dev(id_priv->cma_dev);
 532         id_priv->cma_dev = NULL;
 533         mutex_unlock(&lock);
 534 }
 535
 536 static inline struct sockaddr *cma_src_addr(struct rdma_id_private *id_priv)
 537 {
 538         return (struct sockaddr *) &id_priv->id.route.addr.src_addr;
 539 }
 540
 541 static inline struct sockaddr *cma_dst_addr(struct rdma_id_private *id_priv)
 542 {
 543         return (struct sockaddr *) &id_priv->id.route.addr.dst_addr;
 544 }
 545
 546 static inline unsigned short cma_family(struct rdma_id_private *id_priv)
 547 {
 548         return id_priv->id.route.addr.src_addr.ss_family;
 549 }
 550
 551 static int cma_set_qkey(struct rdma_id_private *id_priv, u32 qkey)
 552 {
 553         struct ib_sa_mcmember_rec rec;
 554         int ret = 0;
 555
 556         if (id_priv->qkey) {
 557                 if (qkey && id_priv->qkey != qkey)
 558                         return -EINVAL;
 559                 return 0;
 560         }
 561
 562         if (qkey) {
 563                 id_priv->qkey = qkey;
 564                 return 0;
 565         }
 566
 567         switch (id_priv->id.ps) {
 568         case RDMA_PS_UDP:
 569         case RDMA_PS_IB:
 570                 id_priv->qkey = RDMA_UDP_QKEY;
 571                 break;
 572         case RDMA_PS_IPOIB:
 573                 ib_addr_get_mgid(&id_priv->id.route.addr.dev_addr, &rec.mgid);
 574                 ret = ib_sa_get_mcmember_rec(id_priv->id.device,
 575                                              id_priv->id.port_num, &rec.mgid,
 576                                              &rec);
 577                 if (!ret)
 578                         id_priv->qkey = be32_to_cpu(rec.qkey);
 579                 break;
 580         default:
 581                 break;
 582         }
 583         return ret;
 584 }
 585
 586 static void cma_translate_ib(struct sockaddr_ib *sib, struct rdma_dev_addr *dev_addr)
 587 {
 588         dev_addr->dev_type = ARPHRD_INFINIBAND;
 589         rdma_addr_set_sgid(dev_addr, (union ib_gid *) &sib->sib_addr);
 590         ib_addr_set_pkey(dev_addr, ntohs(sib->sib_pkey));
 591 }
 592
 593 static int cma_translate_addr(struct sockaddr *addr, struct rdma_dev_addr *dev_addr)
 594 {
 595         int ret;
 596
 597         if (addr->sa_family != AF_IB) {
 598                 ret = rdma_translate_ip(addr, dev_addr);
 599         } else {
 600                 cma_translate_ib((struct sockaddr_ib *) addr, dev_addr);
 601                 ret = 0;
 602         }
 603
 604         return ret;
 605 }
 606
 607 static const struct ib_gid_attr *
 608 cma_validate_port(struct ib_device *device, u8 port,
 609                   enum ib_gid_type gid_type,
 610                   union ib_gid *gid,
 611                   struct rdma_id_private *id_priv)
 612 {
 613         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
 614         int bound_if_index = dev_addr->bound_dev_if;
 615         const struct ib_gid_attr *sgid_attr;
 616         int dev_type = dev_addr->dev_type;
 617         struct net_device *ndev = NULL;
 618
 619         if (!rdma_dev_access_netns(device, id_priv->id.route.addr.dev_addr.net))
 620                 return ERR_PTR(-ENODEV);
 621
 622         if ((dev_type == ARPHRD_INFINIBAND) && !rdma_protocol_ib(device, port))
 623                 return ERR_PTR(-ENODEV);
 624
 625         if ((dev_type != ARPHRD_INFINIBAND) && rdma_protocol_ib(device, port))
 626                 return ERR_PTR(-ENODEV);
 627
 628         if (dev_type == ARPHRD_ETHER && rdma_protocol_roce(device, port)) {
 629                 ndev = dev_get_by_index(dev_addr->net, bound_if_index);
 630                 if (!ndev)
 631                         return ERR_PTR(-ENODEV);
 632         } else {
 633                 gid_type = IB_GID_TYPE_IB;
 634         }
 635
 636         sgid_attr = rdma_find_gid_by_port(device, gid, gid_type, port, ndev);
 637         if (ndev)
 638                 dev_put(ndev);
 639         return sgid_attr;
 640 }
 641
 642 static void cma_bind_sgid_attr(struct rdma_id_private *id_priv,
 643                                const struct ib_gid_attr *sgid_attr)
 644 {
 645         WARN_ON(id_priv->id.route.addr.dev_addr.sgid_attr);
 646         id_priv->id.route.addr.dev_addr.sgid_attr = sgid_attr;
 647 }
 648
 649 /**
 650  * cma_acquire_dev_by_src_ip - Acquire cma device, port, gid attribute
 651  * based on source ip address.
 652  * @id_priv:    cm_id which should be bound to cma device
 653  *
 654  * cma_acquire_dev_by_src_ip() binds cm id to cma device, port and GID attribute
 655  * based on source IP address. It returns 0 on success or error code otherwise.
 656  * It is applicable to active and passive side cm_id.
 657  */
 658 static int cma_acquire_dev_by_src_ip(struct rdma_id_private *id_priv)
 659 {
 660         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
 661         const struct ib_gid_attr *sgid_attr;
 662         union ib_gid gid, iboe_gid, *gidp;
 663         struct cma_device *cma_dev;
 664         enum ib_gid_type gid_type;
 665         int ret = -ENODEV;
 666         unsigned int port;
 667
 668         if (dev_addr->dev_type != ARPHRD_INFINIBAND &&
 669             id_priv->id.ps == RDMA_PS_IPOIB)
 670                 return -EINVAL;
 671
 672         rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
 673                     &iboe_gid);
 674
 675         memcpy(&gid, dev_addr->src_dev_addr +
 676                rdma_addr_gid_offset(dev_addr), sizeof(gid));
 677
 678         mutex_lock(&lock);
 679         list_for_each_entry(cma_dev, &dev_list, list) {
 680                 rdma_for_each_port (cma_dev->device, port) {
 681                         gidp = rdma_protocol_roce(cma_dev->device, port) ?
 682                                &iboe_gid : &gid;
 683                         gid_type = cma_dev->default_gid_type[port - 1];
 684                         sgid_attr = cma_validate_port(cma_dev->device, port,
 685                                                       gid_type, gidp, id_priv);
 686                         if (!IS_ERR(sgid_attr)) {
 687                                 id_priv->id.port_num = port;
 688                                 cma_bind_sgid_attr(id_priv, sgid_attr);
 689                                 cma_attach_to_dev(id_priv, cma_dev);
 690                                 ret = 0;
 691                                 goto out;
 692                         }
 693                 }
 694         }
 695 out:
 696         mutex_unlock(&lock);
 697         return ret;
 698 }
 699
 700 /**
 701  * cma_ib_acquire_dev - Acquire cma device, port and SGID attribute
 702  * @id_priv:            cm id to bind to cma device
 703  * @listen_id_priv:     listener cm id to match against
 704  * @req:                Pointer to req structure containaining incoming
 705  *                      request information
 706  * cma_ib_acquire_dev() acquires cma device, port and SGID attribute when
 707  * rdma device matches for listen_id and incoming request. It also verifies
 708  * that a GID table entry is present for the source address.
 709  * Returns 0 on success, or returns error code otherwise.
 710  */
 711 static int cma_ib_acquire_dev(struct rdma_id_private *id_priv,
 712                               const struct rdma_id_private *listen_id_priv,
 713                               struct cma_req_info *req)
 714 {
 715         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
 716         const struct ib_gid_attr *sgid_attr;
 717         enum ib_gid_type gid_type;
 718         union ib_gid gid;
 719
 720         if (dev_addr->dev_type != ARPHRD_INFINIBAND &&
 721             id_priv->id.ps == RDMA_PS_IPOIB)
 722                 return -EINVAL;
 723
 724         if (rdma_protocol_roce(req->device, req->port))
 725                 rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
 726                             &gid);
 727         else
 728                 memcpy(&gid, dev_addr->src_dev_addr +
 729                        rdma_addr_gid_offset(dev_addr), sizeof(gid));
 730
 731         gid_type = listen_id_priv->cma_dev->default_gid_type[req->port - 1];
 732         sgid_attr = cma_validate_port(req->device, req->port,
 733                                       gid_type, &gid, id_priv);
 734         if (IS_ERR(sgid_attr))
 735                 return PTR_ERR(sgid_attr);
 736
 737         id_priv->id.port_num = req->port;
 738         cma_bind_sgid_attr(id_priv, sgid_attr);
 739         /* Need to acquire lock to protect against reader
 740          * of cma_dev->id_list such as cma_netdev_callback() and
 741          * cma_process_remove().
 742          */
 743         mutex_lock(&lock);
 744         cma_attach_to_dev(id_priv, listen_id_priv->cma_dev);
 745         mutex_unlock(&lock);
 746         return 0;
 747 }
 748
 749 static int cma_iw_acquire_dev(struct rdma_id_private *id_priv,
 750                               const struct rdma_id_private *listen_id_priv)
 751 {
 752         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
 753         const struct ib_gid_attr *sgid_attr;
 754         struct cma_device *cma_dev;
 755         enum ib_gid_type gid_type;
 756         int ret = -ENODEV;
 757         union ib_gid gid;
 758         u8 port;
 759
 760         if (dev_addr->dev_type != ARPHRD_INFINIBAND &&
 761             id_priv->id.ps == RDMA_PS_IPOIB)
 762                 return -EINVAL;
 763
 764         memcpy(&gid, dev_addr->src_dev_addr +
 765                rdma_addr_gid_offset(dev_addr), sizeof(gid));
 766
 767         mutex_lock(&lock);
 768
 769         cma_dev = listen_id_priv->cma_dev;
 770         port = listen_id_priv->id.port_num;
 771         gid_type = listen_id_priv->gid_type;
 772         sgid_attr = cma_validate_port(cma_dev->device, port,
 773                                       gid_type, &gid, id_priv);
 774         if (!IS_ERR(sgid_attr)) {
 775                 id_priv->id.port_num = port;
 776                 cma_bind_sgid_attr(id_priv, sgid_attr);
 777                 ret = 0;
 778                 goto out;
 779         }
 780
 781         list_for_each_entry(cma_dev, &dev_list, list) {
 782                 for (port = 1; port <= cma_dev->device->phys_port_cnt; ++port) {
 783                         if (listen_id_priv->cma_dev == cma_dev &&
 784                             listen_id_priv->id.port_num == port)
 785                                 continue;
 786
 787                         gid_type = cma_dev->default_gid_type[port - 1];
 788                         sgid_attr = cma_validate_port(cma_dev->device, port,
 789                                                       gid_type, &gid, id_priv);
 790                         if (!IS_ERR(sgid_attr)) {
 791                                 id_priv->id.port_num = port;
 792                                 cma_bind_sgid_attr(id_priv, sgid_attr);
 793                                 ret = 0;
 794                                 goto out;
 795                         }
 796                 }
 797         }
 798
 799 out:
 800         if (!ret)
 801                 cma_attach_to_dev(id_priv, cma_dev);
 802
 803         mutex_unlock(&lock);
 804         return ret;
 805 }
 806
 807 /*
 808  * Select the source IB device and address to reach the destination IB address.
 809  */
 810 static int cma_resolve_ib_dev(struct rdma_id_private *id_priv)
 811 {
 812         struct cma_device *cma_dev, *cur_dev;
 813         struct sockaddr_ib *addr;
 814         union ib_gid gid, sgid, *dgid;
 815         u16 pkey, index;
 816         u8 p;
 817         enum ib_port_state port_state;
 818         int i;
 819
 820         cma_dev = NULL;
 821         addr = (struct sockaddr_ib *) cma_dst_addr(id_priv);
 822         dgid = (union ib_gid *) &addr->sib_addr;
 823         pkey = ntohs(addr->sib_pkey);
 824
 825         mutex_lock(&lock);
 826         list_for_each_entry(cur_dev, &dev_list, list) {
 827                 for (p = 1; p <= cur_dev->device->phys_port_cnt; ++p) {
 828                         if (!rdma_cap_af_ib(cur_dev->device, p))
 829                                 continue;
 830
 831                         if (ib_find_cached_pkey(cur_dev->device, p, pkey, &index))
 832                                 continue;
 833
 834                         if (ib_get_cached_port_state(cur_dev->device, p, &port_state))
 835                                 continue;
 836                         for (i = 0; !rdma_query_gid(cur_dev->device,
 837                                                     p, i, &gid);
 838                              i++) {
 839                                 if (!memcmp(&gid, dgid, sizeof(gid))) {
 840                                         cma_dev = cur_dev;
 841                                         sgid = gid;
 842                                         id_priv->id.port_num = p;
 843                                         goto found;
 844                                 }
 845
 846                                 if (!cma_dev && (gid.global.subnet_prefix ==
 847                                     dgid->global.subnet_prefix) &&
 848                                     port_state == IB_PORT_ACTIVE) {
 849                                         cma_dev = cur_dev;
 850                                         sgid = gid;
 851                                         id_priv->id.port_num = p;
 852                                         goto found;
 853                                 }
 854                         }
 855                 }
 856         }
 857         mutex_unlock(&lock);
 858         return -ENODEV;
 859
 860 found:
 861         cma_attach_to_dev(id_priv, cma_dev);
 862         mutex_unlock(&lock);
 863         addr = (struct sockaddr_ib *)cma_src_addr(id_priv);
 864         memcpy(&addr->sib_addr, &sgid, sizeof(sgid));
 865         cma_translate_ib(addr, &id_priv->id.route.addr.dev_addr);
 866         return 0;
 867 }
 868
 869 static void cma_deref_id(struct rdma_id_private *id_priv)
 870 {
 871         if (atomic_dec_and_test(&id_priv->refcount))
 872                 complete(&id_priv->comp);
 873 }
 874
 875 struct rdma_cm_id *__rdma_create_id(struct net *net,
 876                                     rdma_cm_event_handler event_handler,
 877                                     void *context, enum rdma_ucm_port_space ps,
 878                                     enum ib_qp_type qp_type, const char *caller)
 879 {
 880         struct rdma_id_private *id_priv;
 881
 882         id_priv = kzalloc(sizeof *id_priv, GFP_KERNEL);
 883         if (!id_priv)
 884                 return ERR_PTR(-ENOMEM);
 885
 886         rdma_restrack_set_task(&id_priv->res, caller);
 887         id_priv->res.type = RDMA_RESTRACK_CM_ID;
 888         id_priv->state = RDMA_CM_IDLE;
 889         id_priv->id.context = context;
 890         id_priv->id.event_handler = event_handler;
 891         id_priv->id.ps = ps;
 892         id_priv->id.qp_type = qp_type;
 893         id_priv->tos_set = false;
 894         id_priv->timeout_set = false;
 895         id_priv->gid_type = IB_GID_TYPE_IB;
 896         spin_lock_init(&id_priv->lock);
 897         mutex_init(&id_priv->qp_mutex);
 898         init_completion(&id_priv->comp);
 899         atomic_set(&id_priv->refcount, 1);
 900         mutex_init(&id_priv->handler_mutex);
 901         INIT_LIST_HEAD(&id_priv->listen_list);
 902         INIT_LIST_HEAD(&id_priv->mc_list);
 903         get_random_bytes(&id_priv->seq_num, sizeof id_priv->seq_num);
 904         id_priv->id.route.addr.dev_addr.net = get_net(net);
 905         id_priv->seq_num &= 0x00ffffff;
 906
 907         return &id_priv->id;
 908 }
 909 EXPORT_SYMBOL(__rdma_create_id);
 910
 911 static int cma_init_ud_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
 912 {
 913         struct ib_qp_attr qp_attr;
 914         int qp_attr_mask, ret;
 915
 916         qp_attr.qp_state = IB_QPS_INIT;
 917         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 918         if (ret)
 919                 return ret;
 920
 921         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 922         if (ret)
 923                 return ret;
 924
 925         qp_attr.qp_state = IB_QPS_RTR;
 926         ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
 927         if (ret)
 928                 return ret;
 929
 930         qp_attr.qp_state = IB_QPS_RTS;
 931         qp_attr.sq_psn = 0;
 932         ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE | IB_QP_SQ_PSN);
 933
 934         return ret;
 935 }
 936
 937 static int cma_init_conn_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
 938 {
 939         struct ib_qp_attr qp_attr;
 940         int qp_attr_mask, ret;
 941
 942         qp_attr.qp_state = IB_QPS_INIT;
 943         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 944         if (ret)
 945                 return ret;
 946
 947         return ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 948 }
 949
 950 int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
 951                    struct ib_qp_init_attr *qp_init_attr)
 952 {
 953         struct rdma_id_private *id_priv;
 954         struct ib_qp *qp;
 955         int ret;
 956
 957         id_priv = container_of(id, struct rdma_id_private, id);
 958         if (id->device != pd->device)
 959                 return -EINVAL;
 960
 961         qp_init_attr->port_num = id->port_num;
 962         qp = ib_create_qp(pd, qp_init_attr);
 963         if (IS_ERR(qp))
 964                 return PTR_ERR(qp);
 965
 966         if (id->qp_type == IB_QPT_UD)
 967                 ret = cma_init_ud_qp(id_priv, qp);
 968         else
 969                 ret = cma_init_conn_qp(id_priv, qp);
 970         if (ret)
 971                 goto err;
 972
 973         id->qp = qp;
 974         id_priv->qp_num = qp->qp_num;
 975         id_priv->srq = (qp->srq != NULL);
 976         return 0;
 977 err:
 978         ib_destroy_qp(qp);
 979         return ret;
 980 }
 981 EXPORT_SYMBOL(rdma_create_qp);
 982
 983 void rdma_destroy_qp(struct rdma_cm_id *id)
 984 {
 985         struct rdma_id_private *id_priv;
 986
 987         id_priv = container_of(id, struct rdma_id_private, id);
 988         mutex_lock(&id_priv->qp_mutex);
 989         ib_destroy_qp(id_priv->id.qp);
 990         id_priv->id.qp = NULL;
 991         mutex_unlock(&id_priv->qp_mutex);
 992 }
 993 EXPORT_SYMBOL(rdma_destroy_qp);
 994
 995 static int cma_modify_qp_rtr(struct rdma_id_private *id_priv,
 996                              struct rdma_conn_param *conn_param)
 997 {
 998         struct ib_qp_attr qp_attr;
 999         int qp_attr_mask, ret;
1000
1001         mutex_lock(&id_priv->qp_mutex);
1002         if (!id_priv->id.qp) {
1003                 ret = 0;
1004                 goto out;
1005         }
1006
1007         /* Need to update QP attributes from default values. */
1008         qp_attr.qp_state = IB_QPS_INIT;
1009         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
1010         if (ret)
1011                 goto out;
1012
1013         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
1014         if (ret)
1015                 goto out;
1016
1017         qp_attr.qp_state = IB_QPS_RTR;
1018         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
1019         if (ret)
1020                 goto out;
1021
1022         BUG_ON(id_priv->cma_dev->device != id_priv->id.device);
1023
1024         if (conn_param)
1025                 qp_attr.max_dest_rd_atomic = conn_param->responder_resources;
1026         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
1027 out:
1028         mutex_unlock(&id_priv->qp_mutex);
1029         return ret;
1030 }
1031
1032 static int cma_modify_qp_rts(struct rdma_id_private *id_priv,
1033                              struct rdma_conn_param *conn_param)
1034 {
1035         struct ib_qp_attr qp_attr;
1036         int qp_attr_mask, ret;
1037
1038         mutex_lock(&id_priv->qp_mutex);
1039         if (!id_priv->id.qp) {
1040                 ret = 0;
1041                 goto out;
1042         }
1043
1044         qp_attr.qp_state = IB_QPS_RTS;
1045         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
1046         if (ret)
1047                 goto out;
1048
1049         if (conn_param)
1050                 qp_attr.max_rd_atomic = conn_param->initiator_depth;
1051         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
1052 out:
1053         mutex_unlock(&id_priv->qp_mutex);
1054         return ret;
1055 }
1056
1057 static int cma_modify_qp_err(struct rdma_id_private *id_priv)
1058 {
1059         struct ib_qp_attr qp_attr;
1060         int ret;
1061
1062         mutex_lock(&id_priv->qp_mutex);
1063         if (!id_priv->id.qp) {
1064                 ret = 0;
1065                 goto out;
1066         }
1067
1068         qp_attr.qp_state = IB_QPS_ERR;
1069         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, IB_QP_STATE);
1070 out:
1071         mutex_unlock(&id_priv->qp_mutex);
1072         return ret;
1073 }
1074
1075 static int cma_ib_init_qp_attr(struct rdma_id_private *id_priv,
1076                                struct ib_qp_attr *qp_attr, int *qp_attr_mask)
1077 {
1078         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
1079         int ret;
1080         u16 pkey;
1081
1082         if (rdma_cap_eth_ah(id_priv->id.device, id_priv->id.port_num))
1083                 pkey = 0xffff;
1084         else
1085                 pkey = ib_addr_get_pkey(dev_addr);
1086
1087         ret = ib_find_cached_pkey(id_priv->id.device, id_priv->id.port_num,
1088                                   pkey, &qp_attr->pkey_index);
1089         if (ret)
1090                 return ret;
1091
1092         qp_attr->port_num = id_priv->id.port_num;
1093         *qp_attr_mask = IB_QP_STATE | IB_QP_PKEY_INDEX | IB_QP_PORT;
1094
1095         if (id_priv->id.qp_type == IB_QPT_UD) {
1096                 ret = cma_set_qkey(id_priv, 0);
1097                 if (ret)
1098                         return ret;
1099
1100                 qp_attr->qkey = id_priv->qkey;
1101                 *qp_attr_mask |= IB_QP_QKEY;
1102         } else {
1103                 qp_attr->qp_access_flags = 0;
1104                 *qp_attr_mask |= IB_QP_ACCESS_FLAGS;
1105         }
1106         return 0;
1107 }
1108
1109 int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
1110                        int *qp_attr_mask)
1111 {
1112         struct rdma_id_private *id_priv;
1113         int ret = 0;
1114
1115         id_priv = container_of(id, struct rdma_id_private, id);
1116         if (rdma_cap_ib_cm(id->device, id->port_num)) {
1117                 if (!id_priv->cm_id.ib || (id_priv->id.qp_type == IB_QPT_UD))
1118                         ret = cma_ib_init_qp_attr(id_priv, qp_attr, qp_attr_mask);
1119                 else
1120                         ret = ib_cm_init_qp_attr(id_priv->cm_id.ib, qp_attr,
1121                                                  qp_attr_mask);
1122
1123                 if (qp_attr->qp_state == IB_QPS_RTR)
1124                         qp_attr->rq_psn = id_priv->seq_num;
1125         } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
1126                 if (!id_priv->cm_id.iw) {
1127                         qp_attr->qp_access_flags = 0;
1128                         *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS;
1129                 } else
1130                         ret = iw_cm_init_qp_attr(id_priv->cm_id.iw, qp_attr,
1131                                                  qp_attr_mask);
1132                 qp_attr->port_num = id_priv->id.port_num;
1133                 *qp_attr_mask |= IB_QP_PORT;
1134         } else
1135                 ret = -ENOSYS;
1136
1137         if ((*qp_attr_mask & IB_QP_TIMEOUT) && id_priv->timeout_set)
1138                 qp_attr->timeout = id_priv->timeout;
1139
1140         return ret;
1141 }
1142 EXPORT_SYMBOL(rdma_init_qp_attr);
1143
1144 static inline bool cma_zero_addr(const struct sockaddr *addr)
1145 {
1146         switch (addr->sa_family) {
1147         case AF_INET:
1148                 return ipv4_is_zeronet(((struct sockaddr_in *)addr)->sin_addr.s_addr);
1149         case AF_INET6:
1150                 return ipv6_addr_any(&((struct sockaddr_in6 *)addr)->sin6_addr);
1151         case AF_IB:
1152                 return ib_addr_any(&((struct sockaddr_ib *)addr)->sib_addr);
1153         default:
1154                 return false;
1155         }
1156 }
1157
1158 static inline bool cma_loopback_addr(const struct sockaddr *addr)
1159 {
1160         switch (addr->sa_family) {
1161         case AF_INET:
1162                 return ipv4_is_loopback(
1163                         ((struct sockaddr_in *)addr)->sin_addr.s_addr);
1164         case AF_INET6:
1165                 return ipv6_addr_loopback(
1166                         &((struct sockaddr_in6 *)addr)->sin6_addr);
1167         case AF_IB:
1168                 return ib_addr_loopback(
1169                         &((struct sockaddr_ib *)addr)->sib_addr);
1170         default:
1171                 return false;
1172         }
1173 }
1174
1175 static inline bool cma_any_addr(const struct sockaddr *addr)
1176 {
1177         return cma_zero_addr(addr) || cma_loopback_addr(addr);
1178 }
1179
1180 static int cma_addr_cmp(const struct sockaddr *src, const struct sockaddr *dst)
1181 {
1182         if (src->sa_family != dst->sa_family)
1183                 return -1;
1184
1185         switch (src->sa_family) {
1186         case AF_INET:
1187                 return ((struct sockaddr_in *)src)->sin_addr.s_addr !=
1188                        ((struct sockaddr_in *)dst)->sin_addr.s_addr;
1189         case AF_INET6: {
1190                 struct sockaddr_in6 *src_addr6 = (struct sockaddr_in6 *)src;
1191                 struct sockaddr_in6 *dst_addr6 = (struct sockaddr_in6 *)dst;
1192                 bool link_local;
1193
1194                 if (ipv6_addr_cmp(&src_addr6->sin6_addr,
1195                                           &dst_addr6->sin6_addr))
1196                         return 1;
1197                 link_local = ipv6_addr_type(&dst_addr6->sin6_addr) &
1198                              IPV6_ADDR_LINKLOCAL;
1199                 /* Link local must match their scope_ids */
1200                 return link_local ? (src_addr6->sin6_scope_id !=
1201                                      dst_addr6->sin6_scope_id) :
1202                                     0;
1203         }
1204
1205         default:
1206                 return ib_addr_cmp(&((struct sockaddr_ib *) src)->sib_addr,
1207                                    &((struct sockaddr_ib *) dst)->sib_addr);
1208         }
1209 }
1210
1211 static __be16 cma_port(const struct sockaddr *addr)
1212 {
1213         struct sockaddr_ib *sib;
1214
1215         switch (addr->sa_family) {
1216         case AF_INET:
1217                 return ((struct sockaddr_in *) addr)->sin_port;
1218         case AF_INET6:
1219                 return ((struct sockaddr_in6 *) addr)->sin6_port;
1220         case AF_IB:
1221                 sib = (struct sockaddr_ib *) addr;
1222                 return htons((u16) (be64_to_cpu(sib->sib_sid) &
1223                                     be64_to_cpu(sib->sib_sid_mask)));
1224         default:
1225                 return 0;
1226         }
1227 }
1228
1229 static inline int cma_any_port(const struct sockaddr *addr)
1230 {
1231         return !cma_port(addr);
1232 }
1233
1234 static void cma_save_ib_info(struct sockaddr *src_addr,
1235                              struct sockaddr *dst_addr,
1236                              const struct rdma_cm_id *listen_id,
1237                              const struct sa_path_rec *path)
1238 {
1239         struct sockaddr_ib *listen_ib, *ib;
1240
1241         listen_ib = (struct sockaddr_ib *) &listen_id->route.addr.src_addr;
1242         if (src_addr) {
1243                 ib = (struct sockaddr_ib *)src_addr;
1244                 ib->sib_family = AF_IB;
1245                 if (path) {
1246                         ib->sib_pkey = path->pkey;
1247                         ib->sib_flowinfo = path->flow_label;
1248                         memcpy(&ib->sib_addr, &path->sgid, 16);
1249                         ib->sib_sid = path->service_id;
1250                         ib->sib_scope_id = 0;
1251                 } else {
1252                         ib->sib_pkey = listen_ib->sib_pkey;
1253                         ib->sib_flowinfo = listen_ib->sib_flowinfo;
1254                         ib->sib_addr = listen_ib->sib_addr;
1255                         ib->sib_sid = listen_ib->sib_sid;
1256                         ib->sib_scope_id = listen_ib->sib_scope_id;
1257                 }
1258                 ib->sib_sid_mask = cpu_to_be64(0xffffffffffffffffULL);
1259         }
1260         if (dst_addr) {
1261                 ib = (struct sockaddr_ib *)dst_addr;
1262                 ib->sib_family = AF_IB;
1263                 if (path) {
1264                         ib->sib_pkey = path->pkey;
1265                         ib->sib_flowinfo = path->flow_label;
1266                         memcpy(&ib->sib_addr, &path->dgid, 16);
1267                 }
1268         }
1269 }
1270
1271 static void cma_save_ip4_info(struct sockaddr_in *src_addr,
1272                               struct sockaddr_in *dst_addr,
1273                               struct cma_hdr *hdr,
1274                               __be16 local_port)
1275 {
1276         if (src_addr) {
1277                 *src_addr = (struct sockaddr_in) {
1278                         .sin_family = AF_INET,
1279                         .sin_addr.s_addr = hdr->dst_addr.ip4.addr,
1280                         .sin_port = local_port,
1281                 };
1282         }
1283
1284         if (dst_addr) {
1285                 *dst_addr = (struct sockaddr_in) {
1286                         .sin_family = AF_INET,
1287                         .sin_addr.s_addr = hdr->src_addr.ip4.addr,
1288                         .sin_port = hdr->port,
1289                 };
1290         }
1291 }
1292
1293 static void cma_save_ip6_info(struct sockaddr_in6 *src_addr,
1294                               struct sockaddr_in6 *dst_addr,
1295                               struct cma_hdr *hdr,
1296                               __be16 local_port)
1297 {
1298         if (src_addr) {
1299                 *src_addr = (struct sockaddr_in6) {
1300                         .sin6_family = AF_INET6,
1301                         .sin6_addr = hdr->dst_addr.ip6,
1302                         .sin6_port = local_port,
1303                 };
1304         }
1305
1306         if (dst_addr) {
1307                 *dst_addr = (struct sockaddr_in6) {
1308                         .sin6_family = AF_INET6,
1309                         .sin6_addr = hdr->src_addr.ip6,
1310                         .sin6_port = hdr->port,
1311                 };
1312         }
1313 }
1314
1315 static u16 cma_port_from_service_id(__be64 service_id)
1316 {
1317         return (u16)be64_to_cpu(service_id);
1318 }
1319
1320 static int cma_save_ip_info(struct sockaddr *src_addr,
1321                             struct sockaddr *dst_addr,
1322                             const struct ib_cm_event *ib_event,
1323                             __be64 service_id)
1324 {
1325         struct cma_hdr *hdr;
1326         __be16 port;
1327
1328         hdr = ib_event->private_data;
1329         if (hdr->cma_version != CMA_VERSION)
1330                 return -EINVAL;
1331
1332         port = htons(cma_port_from_service_id(service_id));
1333
1334         switch (cma_get_ip_ver(hdr)) {
1335         case 4:
1336                 cma_save_ip4_info((struct sockaddr_in *)src_addr,
1337                                   (struct sockaddr_in *)dst_addr, hdr, port);
1338                 break;
1339         case 6:
1340                 cma_save_ip6_info((struct sockaddr_in6 *)src_addr,
1341                                   (struct sockaddr_in6 *)dst_addr, hdr, port);
1342                 break;
1343         default:
1344                 return -EAFNOSUPPORT;
1345         }
1346
1347         return 0;
1348 }
1349
1350 static int cma_save_net_info(struct sockaddr *src_addr,
1351                              struct sockaddr *dst_addr,
1352                              const struct rdma_cm_id *listen_id,
1353                              const struct ib_cm_event *ib_event,
1354                              sa_family_t sa_family, __be64 service_id)
1355 {
1356         if (sa_family == AF_IB) {
1357                 if (ib_event->event == IB_CM_REQ_RECEIVED)
1358                         cma_save_ib_info(src_addr, dst_addr, listen_id,
1359                                          ib_event->param.req_rcvd.primary_path);
1360                 else if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED)
1361                         cma_save_ib_info(src_addr, dst_addr, listen_id, NULL);
1362                 return 0;
1363         }
1364
1365         return cma_save_ip_info(src_addr, dst_addr, ib_event, service_id);
1366 }
1367
1368 static int cma_save_req_info(const struct ib_cm_event *ib_event,
1369                              struct cma_req_info *req)
1370 {
1371         const struct ib_cm_req_event_param *req_param =
1372                 &ib_event->param.req_rcvd;
1373         const struct ib_cm_sidr_req_event_param *sidr_param =
1374                 &ib_event->param.sidr_req_rcvd;
1375
1376         switch (ib_event->event) {
1377         case IB_CM_REQ_RECEIVED:
1378                 req->device     = req_param->listen_id->device;
1379                 req->port       = req_param->port;
1380                 memcpy(&req->local_gid, &req_param->primary_path->sgid,
1381                        sizeof(req->local_gid));
1382                 req->has_gid    = true;
1383                 req->service_id = req_param->primary_path->service_id;
1384                 req->pkey       = be16_to_cpu(req_param->primary_path->pkey);
1385                 if (req->pkey != req_param->bth_pkey)
1386                         pr_warn_ratelimited("RDMA CMA: got different BTH P_Key (0x%x) and primary path P_Key (0x%x)\n"
1387                                             "RDMA CMA: in the future this may cause the request to be dropped\n",
1388                                             req_param->bth_pkey, req->pkey);
1389                 break;
1390         case IB_CM_SIDR_REQ_RECEIVED:
1391                 req->device     = sidr_param->listen_id->device;
1392                 req->port       = sidr_param->port;
1393                 req->has_gid    = false;
1394                 req->service_id = sidr_param->service_id;
1395                 req->pkey       = sidr_param->pkey;
1396                 if (req->pkey != sidr_param->bth_pkey)
1397                         pr_warn_ratelimited("RDMA CMA: got different BTH P_Key (0x%x) and SIDR request payload P_Key (0x%x)\n"
1398                                             "RDMA CMA: in the future this may cause the request to be dropped\n",
1399                                             sidr_param->bth_pkey, req->pkey);
1400                 break;
1401         default:
1402                 return -EINVAL;
1403         }
1404
1405         return 0;
1406 }
1407
1408 static bool validate_ipv4_net_dev(struct net_device *net_dev,
1409                                   const struct sockaddr_in *dst_addr,
1410                                   const struct sockaddr_in *src_addr)
1411 {
1412         __be32 daddr = dst_addr->sin_addr.s_addr,
1413                saddr = src_addr->sin_addr.s_addr;
1414         struct fib_result res;
1415         struct flowi4 fl4;
1416         int err;
1417         bool ret;
1418
1419         if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) ||
1420             ipv4_is_lbcast(daddr) || ipv4_is_zeronet(saddr) ||
1421             ipv4_is_zeronet(daddr) || ipv4_is_loopback(daddr) ||
1422             ipv4_is_loopback(saddr))
1423                 return false;
1424
1425         memset(&fl4, 0, sizeof(fl4));
1426         fl4.flowi4_iif = net_dev->ifindex;
1427         fl4.daddr = daddr;
1428         fl4.saddr = saddr;
1429
1430         rcu_read_lock();
1431         err = fib_lookup(dev_net(net_dev), &fl4, &res, 0);
1432         ret = err == 0 && FIB_RES_DEV(res) == net_dev;
1433         rcu_read_unlock();
1434
1435         return ret;
1436 }
1437
1438 static bool validate_ipv6_net_dev(struct net_device *net_dev,
1439                                   const struct sockaddr_in6 *dst_addr,
1440                                   const struct sockaddr_in6 *src_addr)
1441 {
1442 #if IS_ENABLED(CONFIG_IPV6)
1443         const int strict = ipv6_addr_type(&dst_addr->sin6_addr) &
1444                            IPV6_ADDR_LINKLOCAL;
1445         struct rt6_info *rt = rt6_lookup(dev_net(net_dev), &dst_addr->sin6_addr,
1446                                          &src_addr->sin6_addr, net_dev->ifindex,
1447                                          NULL, strict);
1448         bool ret;
1449
1450         if (!rt)
1451                 return false;
1452
1453         ret = rt->rt6i_idev->dev == net_dev;
1454         ip6_rt_put(rt);
1455
1456         return ret;
1457 #else
1458         return false;
1459 #endif
1460 }
1461
1462 static bool validate_net_dev(struct net_device *net_dev,
1463                              const struct sockaddr *daddr,
1464                              const struct sockaddr *saddr)
1465 {
1466         const struct sockaddr_in *daddr4 = (const struct sockaddr_in *)daddr;
1467         const struct sockaddr_in *saddr4 = (const struct sockaddr_in *)saddr;
1468         const struct sockaddr_in6 *daddr6 = (const struct sockaddr_in6 *)daddr;
1469         const struct sockaddr_in6 *saddr6 = (const struct sockaddr_in6 *)saddr;
1470
1471         switch (daddr->sa_family) {
1472         case AF_INET:
1473                 return saddr->sa_family == AF_INET &&
1474                        validate_ipv4_net_dev(net_dev, daddr4, saddr4);
1475
1476         case AF_INET6:
1477                 return saddr->sa_family == AF_INET6 &&
1478                        validate_ipv6_net_dev(net_dev, daddr6, saddr6);
1479
1480         default:
1481                 return false;
1482         }
1483 }
1484
1485 static struct net_device *
1486 roce_get_net_dev_by_cm_event(const struct ib_cm_event *ib_event)
1487 {
1488         const struct ib_gid_attr *sgid_attr = NULL;
1489         struct net_device *ndev;
1490
1491         if (ib_event->event == IB_CM_REQ_RECEIVED)
1492                 sgid_attr = ib_event->param.req_rcvd.ppath_sgid_attr;
1493         else if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED)
1494                 sgid_attr = ib_event->param.sidr_req_rcvd.sgid_attr;
1495
1496         if (!sgid_attr)
1497                 return NULL;
1498
1499         rcu_read_lock();
1500         ndev = rdma_read_gid_attr_ndev_rcu(sgid_attr);
1501         if (IS_ERR(ndev))
1502                 ndev = NULL;
1503         else
1504                 dev_hold(ndev);
1505         rcu_read_unlock();
1506         return ndev;
1507 }
1508
1509 static struct net_device *cma_get_net_dev(const struct ib_cm_event *ib_event,
1510                                           struct cma_req_info *req)
1511 {
1512         struct sockaddr *listen_addr =
1513                         (struct sockaddr *)&req->listen_addr_storage;
1514         struct sockaddr *src_addr = (struct sockaddr *)&req->src_addr_storage;
1515         struct net_device *net_dev;
1516         const union ib_gid *gid = req->has_gid ? &req->local_gid : NULL;
1517         int err;
1518
1519         err = cma_save_ip_info(listen_addr, src_addr, ib_event,
1520                                req->service_id);
1521         if (err)
1522                 return ERR_PTR(err);
1523
1524         if (rdma_protocol_roce(req->device, req->port))
1525                 net_dev = roce_get_net_dev_by_cm_event(ib_event);
1526         else
1527                 net_dev = ib_get_net_dev_by_params(req->device, req->port,
1528                                                    req->pkey,
1529                                                    gid, listen_addr);
1530         if (!net_dev)
1531                 return ERR_PTR(-ENODEV);
1532
1533         return net_dev;
1534 }
1535
1536 static enum rdma_ucm_port_space rdma_ps_from_service_id(__be64 service_id)
1537 {
1538         return (be64_to_cpu(service_id) >> 16) & 0xffff;
1539 }
1540
1541 static bool cma_match_private_data(struct rdma_id_private *id_priv,
1542                                    const struct cma_hdr *hdr)
1543 {
1544         struct sockaddr *addr = cma_src_addr(id_priv);
1545         __be32 ip4_addr;
1546         struct in6_addr ip6_addr;
1547
1548         if (cma_any_addr(addr) && !id_priv->afonly)
1549                 return true;
1550
1551         switch (addr->sa_family) {
1552         case AF_INET:
1553                 ip4_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
1554                 if (cma_get_ip_ver(hdr) != 4)
1555                         return false;
1556                 if (!cma_any_addr(addr) &&
1557                     hdr->dst_addr.ip4.addr != ip4_addr)
1558                         return false;
1559                 break;
1560         case AF_INET6:
1561                 ip6_addr = ((struct sockaddr_in6 *)addr)->sin6_addr;
1562                 if (cma_get_ip_ver(hdr) != 6)
1563                         return false;
1564                 if (!cma_any_addr(addr) &&
1565                     memcmp(&hdr->dst_addr.ip6, &ip6_addr, sizeof(ip6_addr)))
1566                         return false;
1567                 break;
1568         case AF_IB:
1569                 return true;
1570         default:
1571                 return false;
1572         }
1573
1574         return true;
1575 }
1576
1577 static bool cma_protocol_roce(const struct rdma_cm_id *id)
1578 {
1579         struct ib_device *device = id->device;
1580         const int port_num = id->port_num ?: rdma_start_port(device);
1581
1582         return rdma_protocol_roce(device, port_num);
1583 }
1584
1585 static bool cma_is_req_ipv6_ll(const struct cma_req_info *req)
1586 {
1587         const struct sockaddr *daddr =
1588                         (const struct sockaddr *)&req->listen_addr_storage;
1589         const struct sockaddr_in6 *daddr6 = (const struct sockaddr_in6 *)daddr;
1590
1591         /* Returns true if the req is for IPv6 link local */
1592         return (daddr->sa_family == AF_INET6 &&
1593                 (ipv6_addr_type(&daddr6->sin6_addr) & IPV6_ADDR_LINKLOCAL));
1594 }
1595
1596 static bool cma_match_net_dev(const struct rdma_cm_id *id,
1597                               const struct net_device *net_dev,
1598                               const struct cma_req_info *req)
1599 {
1600         const struct rdma_addr *addr = &id->route.addr;
1601
1602         if (!net_dev)
1603                 /* This request is an AF_IB request */
1604                 return (!id->port_num || id->port_num == req->port) &&
1605                        (addr->src_addr.ss_family == AF_IB);
1606
1607         /*
1608          * If the request is not for IPv6 link local, allow matching
1609          * request to any netdevice of the one or multiport rdma device.
1610          */
1611         if (!cma_is_req_ipv6_ll(req))
1612                 return true;
1613         /*
1614          * Net namespaces must match, and if the listner is listening
1615          * on a specific netdevice than netdevice must match as well.
1616          */
1617         if (net_eq(dev_net(net_dev), addr->dev_addr.net) &&
1618             (!!addr->dev_addr.bound_dev_if ==
1619              (addr->dev_addr.bound_dev_if == net_dev->ifindex)))
1620                 return true;
1621         else
1622                 return false;
1623 }
1624
1625 static struct rdma_id_private *cma_find_listener(
1626                 const struct rdma_bind_list *bind_list,
1627                 const struct ib_cm_id *cm_id,
1628                 const struct ib_cm_event *ib_event,
1629                 const struct cma_req_info *req,
1630                 const struct net_device *net_dev)
1631 {
1632         struct rdma_id_private *id_priv, *id_priv_dev;
1633
1634         if (!bind_list)
1635                 return ERR_PTR(-EINVAL);
1636
1637         hlist_for_each_entry(id_priv, &bind_list->owners, node) {
1638                 if (cma_match_private_data(id_priv, ib_event->private_data)) {
1639                         if (id_priv->id.device == cm_id->device &&
1640                             cma_match_net_dev(&id_priv->id, net_dev, req))
1641                                 return id_priv;
1642                         list_for_each_entry(id_priv_dev,
1643                                             &id_priv->listen_list,
1644                                             listen_list) {
1645                                 if (id_priv_dev->id.device == cm_id->device &&
1646                                     cma_match_net_dev(&id_priv_dev->id,
1647                                                       net_dev, req))
1648                                         return id_priv_dev;
1649                         }
1650                 }
1651         }
1652
1653         return ERR_PTR(-EINVAL);
1654 }
1655
1656 static struct rdma_id_private *
1657 cma_ib_id_from_event(struct ib_cm_id *cm_id,
1658                      const struct ib_cm_event *ib_event,
1659                      struct cma_req_info *req,
1660                      struct net_device **net_dev)
1661 {
1662         struct rdma_bind_list *bind_list;
1663         struct rdma_id_private *id_priv;
1664         int err;
1665
1666         err = cma_save_req_info(ib_event, req);
1667         if (err)
1668                 return ERR_PTR(err);
1669
1670         *net_dev = cma_get_net_dev(ib_event, req);
1671         if (IS_ERR(*net_dev)) {
1672                 if (PTR_ERR(*net_dev) == -EAFNOSUPPORT) {
1673                         /* Assuming the protocol is AF_IB */
1674                         *net_dev = NULL;
1675                 } else {
1676                         return ERR_CAST(*net_dev);
1677                 }
1678         }
1679
1680         /*
1681          * Net namespace might be getting deleted while route lookup,
1682          * cm_id lookup is in progress. Therefore, perform netdevice
1683          * validation, cm_id lookup under rcu lock.
1684          * RCU lock along with netdevice state check, synchronizes with
1685          * netdevice migrating to different net namespace and also avoids
1686          * case where net namespace doesn't get deleted while lookup is in
1687          * progress.
1688          * If the device state is not IFF_UP, its properties such as ifindex
1689          * and nd_net cannot be trusted to remain valid without rcu lock.
1690          * net/core/dev.c change_net_namespace() ensures to synchronize with
1691          * ongoing operations on net device after device is closed using
1692          * synchronize_net().
1693          */
1694         rcu_read_lock();
1695         if (*net_dev) {
1696                 /*
1697                  * If netdevice is down, it is likely that it is administratively
1698                  * down or it might be migrating to different namespace.
1699                  * In that case avoid further processing, as the net namespace
1700                  * or ifindex may change.
1701                  */
1702                 if (((*net_dev)->flags & IFF_UP) == 0) {
1703                         id_priv = ERR_PTR(-EHOSTUNREACH);
1704                         goto err;
1705                 }
1706
1707                 if (!validate_net_dev(*net_dev,
1708                                  (struct sockaddr *)&req->listen_addr_storage,
1709                                  (struct sockaddr *)&req->src_addr_storage)) {
1710                         id_priv = ERR_PTR(-EHOSTUNREACH);
1711                         goto err;
1712                 }
1713         }
1714
1715         bind_list = cma_ps_find(*net_dev ? dev_net(*net_dev) : &init_net,
1716                                 rdma_ps_from_service_id(req->service_id),
1717                                 cma_port_from_service_id(req->service_id));
1718         id_priv = cma_find_listener(bind_list, cm_id, ib_event, req, *net_dev);
1719 err:
1720         rcu_read_unlock();
1721         if (IS_ERR(id_priv) && *net_dev) {
1722                 dev_put(*net_dev);
1723                 *net_dev = NULL;
1724         }
1725         return id_priv;
1726 }
1727
1728 static inline u8 cma_user_data_offset(struct rdma_id_private *id_priv)
1729 {
1730         return cma_family(id_priv) == AF_IB ? 0 : sizeof(struct cma_hdr);
1731 }
1732
1733 static void cma_cancel_route(struct rdma_id_private *id_priv)
1734 {
1735         if (rdma_cap_ib_sa(id_priv->id.device, id_priv->id.port_num)) {
1736                 if (id_priv->query)
1737                         ib_sa_cancel_query(id_priv->query_id, id_priv->query);
1738         }
1739 }
1740
1741 static void cma_cancel_listens(struct rdma_id_private *id_priv)
1742 {
1743         struct rdma_id_private *dev_id_priv;
1744
1745         /*
1746          * Remove from listen_any_list to prevent added devices from spawning
1747          * additional listen requests.
1748          */
1749         mutex_lock(&lock);
1750         list_del(&id_priv->list);
1751
1752         while (!list_empty(&id_priv->listen_list)) {
1753                 dev_id_priv = list_entry(id_priv->listen_list.next,
1754                                          struct rdma_id_private, listen_list);
1755                 /* sync with device removal to avoid duplicate destruction */
1756                 list_del_init(&dev_id_priv->list);
1757                 list_del(&dev_id_priv->listen_list);
1758                 mutex_unlock(&lock);
1759
1760                 rdma_destroy_id(&dev_id_priv->id);
1761                 mutex_lock(&lock);
1762         }
1763         mutex_unlock(&lock);
1764 }
1765
1766 static void cma_cancel_operation(struct rdma_id_private *id_priv,
1767                                  enum rdma_cm_state state)
1768 {
1769         switch (state) {
1770         case RDMA_CM_ADDR_QUERY:
1771                 rdma_addr_cancel(&id_priv->id.route.addr.dev_addr);
1772                 break;
1773         case RDMA_CM_ROUTE_QUERY:
1774                 cma_cancel_route(id_priv);
1775                 break;
1776         case RDMA_CM_LISTEN:
1777                 if (cma_any_addr(cma_src_addr(id_priv)) && !id_priv->cma_dev)
1778                         cma_cancel_listens(id_priv);
1779                 break;
1780         default:
1781                 break;
1782         }
1783 }
1784
1785 static void cma_release_port(struct rdma_id_private *id_priv)
1786 {
1787         struct rdma_bind_list *bind_list = id_priv->bind_list;
1788         struct net *net = id_priv->id.route.addr.dev_addr.net;
1789
1790         if (!bind_list)
1791                 return;
1792
1793         mutex_lock(&lock);
1794         hlist_del(&id_priv->node);
1795         if (hlist_empty(&bind_list->owners)) {
1796                 cma_ps_remove(net, bind_list->ps, bind_list->port);
1797                 kfree(bind_list);
1798         }
1799         mutex_unlock(&lock);
1800 }
1801
1802 static void cma_leave_roce_mc_group(struct rdma_id_private *id_priv,
1803                                     struct cma_multicast *mc)
1804 {
1805         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
1806         struct net_device *ndev = NULL;
1807
1808         if (dev_addr->bound_dev_if)
1809                 ndev = dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if);
1810         if (ndev) {
1811                 cma_igmp_send(ndev, &mc->multicast.ib->rec.mgid, false);
1812                 dev_put(ndev);
1813         }
1814         kref_put(&mc->mcref, release_mc);
1815 }
1816
1817 static void cma_leave_mc_groups(struct rdma_id_private *id_priv)
1818 {
1819         struct cma_multicast *mc;
1820
1821         while (!list_empty(&id_priv->mc_list)) {
1822                 mc = container_of(id_priv->mc_list.next,
1823                                   struct cma_multicast, list);
1824                 list_del(&mc->list);
1825                 if (rdma_cap_ib_mcast(id_priv->cma_dev->device,
1826                                       id_priv->id.port_num)) {
1827                         ib_sa_free_multicast(mc->multicast.ib);
1828                         kfree(mc);
1829                 } else {
1830                         cma_leave_roce_mc_group(id_priv, mc);
1831                 }
1832         }
1833 }
1834
1835 void rdma_destroy_id(struct rdma_cm_id *id)
1836 {
1837         struct rdma_id_private *id_priv;
1838         enum rdma_cm_state state;
1839
1840         id_priv = container_of(id, struct rdma_id_private, id);
1841         state = cma_exch(id_priv, RDMA_CM_DESTROYING);
1842         cma_cancel_operation(id_priv, state);
1843
1844         /*
1845          * Wait for any active callback to finish.  New callbacks will find
1846          * the id_priv state set to destroying and abort.
1847          */
1848         mutex_lock(&id_priv->handler_mutex);
1849         mutex_unlock(&id_priv->handler_mutex);
1850
1851         rdma_restrack_del(&id_priv->res);
1852         if (id_priv->cma_dev) {
1853                 if (rdma_cap_ib_cm(id_priv->id.device, 1)) {
1854                         if (id_priv->cm_id.ib)
1855                                 ib_destroy_cm_id(id_priv->cm_id.ib);
1856                 } else if (rdma_cap_iw_cm(id_priv->id.device, 1)) {
1857                         if (id_priv->cm_id.iw)
1858                                 iw_destroy_cm_id(id_priv->cm_id.iw);
1859                 }
1860                 cma_leave_mc_groups(id_priv);
1861                 cma_release_dev(id_priv);
1862         }
1863
1864         cma_release_port(id_priv);
1865         cma_deref_id(id_priv);
1866         wait_for_completion(&id_priv->comp);
1867
1868         if (id_priv->internal_id)
1869                 cma_deref_id(id_priv->id.context);
1870
1871         kfree(id_priv->id.route.path_rec);
1872
1873         if (id_priv->id.route.addr.dev_addr.sgid_attr)
1874                 rdma_put_gid_attr(id_priv->id.route.addr.dev_addr.sgid_attr);
1875
1876         put_net(id_priv->id.route.addr.dev_addr.net);
1877         kfree(id_priv);
1878 }
1879 EXPORT_SYMBOL(rdma_destroy_id);
1880
1881 static int cma_rep_recv(struct rdma_id_private *id_priv)
1882 {
1883         int ret;
1884
1885         ret = cma_modify_qp_rtr(id_priv, NULL);
1886         if (ret)
1887                 goto reject;
1888
1889         ret = cma_modify_qp_rts(id_priv, NULL);
1890         if (ret)
1891                 goto reject;
1892
1893         ret = ib_send_cm_rtu(id_priv->cm_id.ib, NULL, 0);
1894         if (ret)
1895                 goto reject;
1896
1897         return 0;
1898 reject:
1899         pr_debug_ratelimited("RDMA CM: CONNECT_ERROR: failed to handle reply. status %d\n", ret);
1900         cma_modify_qp_err(id_priv);
1901         ib_send_cm_rej(id_priv->cm_id.ib, IB_CM_REJ_CONSUMER_DEFINED,
1902                        NULL, 0, NULL, 0);
1903         return ret;
1904 }
1905
1906 static void cma_set_rep_event_data(struct rdma_cm_event *event,
1907                                    const struct ib_cm_rep_event_param *rep_data,
1908                                    void *private_data)
1909 {
1910         event->param.conn.private_data = private_data;
1911         event->param.conn.private_data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
1912         event->param.conn.responder_resources = rep_data->responder_resources;
1913         event->param.conn.initiator_depth = rep_data->initiator_depth;
1914         event->param.conn.flow_control = rep_data->flow_control;
1915         event->param.conn.rnr_retry_count = rep_data->rnr_retry_count;
1916         event->param.conn.srq = rep_data->srq;
1917         event->param.conn.qp_num = rep_data->remote_qpn;
1918 }
1919
1920 static int cma_ib_handler(struct ib_cm_id *cm_id,
1921                           const struct ib_cm_event *ib_event)
1922 {
1923         struct rdma_id_private *id_priv = cm_id->context;
1924         struct rdma_cm_event event = {};
1925         int ret = 0;
1926
1927         mutex_lock(&id_priv->handler_mutex);
1928         if ((ib_event->event != IB_CM_TIMEWAIT_EXIT &&
1929              id_priv->state != RDMA_CM_CONNECT) ||
1930             (ib_event->event == IB_CM_TIMEWAIT_EXIT &&
1931              id_priv->state != RDMA_CM_DISCONNECT))
1932                 goto out;
1933
1934         switch (ib_event->event) {
1935         case IB_CM_REQ_ERROR:
1936         case IB_CM_REP_ERROR:
1937                 event.event = RDMA_CM_EVENT_UNREACHABLE;
1938                 event.status = -ETIMEDOUT;
1939                 break;
1940         case IB_CM_REP_RECEIVED:
1941                 if (cma_comp(id_priv, RDMA_CM_CONNECT) &&
1942                     (id_priv->id.qp_type != IB_QPT_UD))
1943                         ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
1944                 if (id_priv->id.qp) {
1945                         event.status = cma_rep_recv(id_priv);
1946                         event.event = event.status ? RDMA_CM_EVENT_CONNECT_ERROR :
1947                                                      RDMA_CM_EVENT_ESTABLISHED;
1948                 } else {
1949                         event.event = RDMA_CM_EVENT_CONNECT_RESPONSE;
1950                 }
1951                 cma_set_rep_event_data(&event, &ib_event->param.rep_rcvd,
1952                                        ib_event->private_data);
1953                 break;
1954         case IB_CM_RTU_RECEIVED:
1955         case IB_CM_USER_ESTABLISHED:
1956                 event.event = RDMA_CM_EVENT_ESTABLISHED;
1957                 break;
1958         case IB_CM_DREQ_ERROR:
1959                 event.status = -ETIMEDOUT; /* fall through */
1960         case IB_CM_DREQ_RECEIVED:
1961         case IB_CM_DREP_RECEIVED:
1962                 if (!cma_comp_exch(id_priv, RDMA_CM_CONNECT,
1963                                    RDMA_CM_DISCONNECT))
1964                         goto out;
1965                 event.event = RDMA_CM_EVENT_DISCONNECTED;
1966                 break;
1967         case IB_CM_TIMEWAIT_EXIT:
1968                 event.event = RDMA_CM_EVENT_TIMEWAIT_EXIT;
1969                 break;
1970         case IB_CM_MRA_RECEIVED:
1971                 /* ignore event */
1972                 goto out;
1973         case IB_CM_REJ_RECEIVED:
1974                 pr_debug_ratelimited("RDMA CM: REJECTED: %s\n", rdma_reject_msg(&id_priv->id,
1975                                                                                 ib_event->param.rej_rcvd.reason));
1976                 cma_modify_qp_err(id_priv);
1977                 event.status = ib_event->param.rej_rcvd.reason;
1978                 event.event = RDMA_CM_EVENT_REJECTED;
1979                 event.param.conn.private_data = ib_event->private_data;
1980                 event.param.conn.private_data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
1981                 break;
1982         default:
1983                 pr_err("RDMA CMA: unexpected IB CM event: %d\n",
1984                        ib_event->event);
1985                 goto out;
1986         }
1987
1988         ret = id_priv->id.event_handler(&id_priv->id, &event);
1989         if (ret) {
1990                 /* Destroy the CM ID by returning a non-zero value. */
1991                 id_priv->cm_id.ib = NULL;
1992                 cma_exch(id_priv, RDMA_CM_DESTROYING);
1993                 mutex_unlock(&id_priv->handler_mutex);
1994                 rdma_destroy_id(&id_priv->id);
1995                 return ret;
1996         }
1997 out:
1998         mutex_unlock(&id_priv->handler_mutex);
1999         return ret;
2000 }
2001
2002 static struct rdma_id_private *
2003 cma_ib_new_conn_id(const struct rdma_cm_id *listen_id,
2004                    const struct ib_cm_event *ib_event,
2005                    struct net_device *net_dev)
2006 {
2007         struct rdma_id_private *listen_id_priv;
2008         struct rdma_id_private *id_priv;
2009         struct rdma_cm_id *id;
2010         struct rdma_route *rt;
2011         const sa_family_t ss_family = listen_id->route.addr.src_addr.ss_family;
2012         struct sa_path_rec *path = ib_event->param.req_rcvd.primary_path;
2013         const __be64 service_id =
2014                 ib_event->param.req_rcvd.primary_path->service_id;
2015         int ret;
2016
2017         listen_id_priv = container_of(listen_id, struct rdma_id_private, id);
2018         id = __rdma_create_id(listen_id->route.addr.dev_addr.net,
2019                             listen_id->event_handler, listen_id->context,
2020                             listen_id->ps, ib_event->param.req_rcvd.qp_type,
2021                             listen_id_priv->res.kern_name);
2022         if (IS_ERR(id))
2023                 return NULL;
2024
2025         id_priv = container_of(id, struct rdma_id_private, id);
2026         if (cma_save_net_info((struct sockaddr *)&id->route.addr.src_addr,
2027                               (struct sockaddr *)&id->route.addr.dst_addr,
2028                               listen_id, ib_event, ss_family, service_id))
2029                 goto err;
2030
2031         rt = &id->route;
2032         rt->num_paths = ib_event->param.req_rcvd.alternate_path ? 2 : 1;
2033         rt->path_rec = kmalloc_array(rt->num_paths, sizeof(*rt->path_rec),
2034                                      GFP_KERNEL);
2035         if (!rt->path_rec)
2036                 goto err;
2037
2038         rt->path_rec[0] = *path;
2039         if (rt->num_paths == 2)
2040                 rt->path_rec[1] = *ib_event->param.req_rcvd.alternate_path;
2041
2042         if (net_dev) {
2043                 rdma_copy_src_l2_addr(&rt->addr.dev_addr, net_dev);
2044         } else {
2045                 if (!cma_protocol_roce(listen_id) &&
2046                     cma_any_addr(cma_src_addr(id_priv))) {
2047                         rt->addr.dev_addr.dev_type = ARPHRD_INFINIBAND;
2048                         rdma_addr_set_sgid(&rt->addr.dev_addr, &rt->path_rec[0].sgid);
2049                         ib_addr_set_pkey(&rt->addr.dev_addr, be16_to_cpu(rt->path_rec[0].pkey));
2050                 } else if (!cma_any_addr(cma_src_addr(id_priv))) {
2051                         ret = cma_translate_addr(cma_src_addr(id_priv), &rt->addr.dev_addr);
2052                         if (ret)
2053                                 goto err;
2054                 }
2055         }
2056         rdma_addr_set_dgid(&rt->addr.dev_addr, &rt->path_rec[0].dgid);
2057
2058         id_priv->state = RDMA_CM_CONNECT;
2059         return id_priv;
2060
2061 err:
2062         rdma_destroy_id(id);
2063         return NULL;
2064 }
2065
2066 static struct rdma_id_private *
2067 cma_ib_new_udp_id(const struct rdma_cm_id *listen_id,
2068                   const struct ib_cm_event *ib_event,
2069                   struct net_device *net_dev)
2070 {
2071         const struct rdma_id_private *listen_id_priv;
2072         struct rdma_id_private *id_priv;
2073         struct rdma_cm_id *id;
2074         const sa_family_t ss_family = listen_id->route.addr.src_addr.ss_family;
2075         struct net *net = listen_id->route.addr.dev_addr.net;
2076         int ret;
2077
2078         listen_id_priv = container_of(listen_id, struct rdma_id_private, id);
2079         id = __rdma_create_id(net, listen_id->event_handler, listen_id->context,
2080                               listen_id->ps, IB_QPT_UD,
2081                               listen_id_priv->res.kern_name);
2082         if (IS_ERR(id))
2083                 return NULL;
2084
2085         id_priv = container_of(id, struct rdma_id_private, id);
2086         if (cma_save_net_info((struct sockaddr *)&id->route.addr.src_addr,
2087                               (struct sockaddr *)&id->route.addr.dst_addr,
2088                               listen_id, ib_event, ss_family,
2089                               ib_event->param.sidr_req_rcvd.service_id))
2090                 goto err;
2091
2092         if (net_dev) {
2093                 rdma_copy_src_l2_addr(&id->route.addr.dev_addr, net_dev);
2094         } else {
2095                 if (!cma_any_addr(cma_src_addr(id_priv))) {
2096                         ret = cma_translate_addr(cma_src_addr(id_priv),
2097                                                  &id->route.addr.dev_addr);
2098                         if (ret)
2099                                 goto err;
2100                 }
2101         }
2102
2103         id_priv->state = RDMA_CM_CONNECT;
2104         return id_priv;
2105 err:
2106         rdma_destroy_id(id);
2107         return NULL;
2108 }
2109
2110 static void cma_set_req_event_data(struct rdma_cm_event *event,
2111                                    const struct ib_cm_req_event_param *req_data,
2112                                    void *private_data, int offset)
2113 {
2114         event->param.conn.private_data = private_data + offset;
2115         event->param.conn.private_data_len = IB_CM_REQ_PRIVATE_DATA_SIZE - offset;
2116         event->param.conn.responder_resources = req_data->responder_resources;
2117         event->param.conn.initiator_depth = req_data->initiator_depth;
2118         event->param.conn.flow_control = req_data->flow_control;
2119         event->param.conn.retry_count = req_data->retry_count;
2120         event->param.conn.rnr_retry_count = req_data->rnr_retry_count;
2121         event->param.conn.srq = req_data->srq;
2122         event->param.conn.qp_num = req_data->remote_qpn;
2123 }
2124
2125 static int cma_ib_check_req_qp_type(const struct rdma_cm_id *id,
2126                                     const struct ib_cm_event *ib_event)
2127 {
2128         return (((ib_event->event == IB_CM_REQ_RECEIVED) &&
2129                  (ib_event->param.req_rcvd.qp_type == id->qp_type)) ||
2130                 ((ib_event->event == IB_CM_SIDR_REQ_RECEIVED) &&
2131                  (id->qp_type == IB_QPT_UD)) ||
2132                 (!id->qp_type));
2133 }
2134
2135 static int cma_ib_req_handler(struct ib_cm_id *cm_id,
2136                               const struct ib_cm_event *ib_event)
2137 {
2138         struct rdma_id_private *listen_id, *conn_id = NULL;
2139         struct rdma_cm_event event = {};
2140         struct cma_req_info req = {};
2141         struct net_device *net_dev;
2142         u8 offset;
2143         int ret;
2144
2145         listen_id = cma_ib_id_from_event(cm_id, ib_event, &req, &net_dev);
2146         if (IS_ERR(listen_id))
2147                 return PTR_ERR(listen_id);
2148
2149         if (!cma_ib_check_req_qp_type(&listen_id->id, ib_event)) {
2150                 ret = -EINVAL;
2151                 goto net_dev_put;
2152         }
2153
2154         mutex_lock(&listen_id->handler_mutex);
2155         if (listen_id->state != RDMA_CM_LISTEN) {
2156                 ret = -ECONNABORTED;
2157                 goto err1;
2158         }
2159
2160         offset = cma_user_data_offset(listen_id);
2161         event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
2162         if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED) {
2163                 conn_id = cma_ib_new_udp_id(&listen_id->id, ib_event, net_dev);
2164                 event.param.ud.private_data = ib_event->private_data + offset;
2165                 event.param.ud.private_data_len =
2166                                 IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE - offset;
2167         } else {
2168                 conn_id = cma_ib_new_conn_id(&listen_id->id, ib_event, net_dev);
2169                 cma_set_req_event_data(&event, &ib_event->param.req_rcvd,
2170                                        ib_event->private_data, offset);
2171         }
2172         if (!conn_id) {
2173                 ret = -ENOMEM;
2174                 goto err1;
2175         }
2176
2177         mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
2178         ret = cma_ib_acquire_dev(conn_id, listen_id, &req);
2179         if (ret)
2180                 goto err2;
2181
2182         conn_id->cm_id.ib = cm_id;
2183         cm_id->context = conn_id;
2184         cm_id->cm_handler = cma_ib_handler;
2185
2186         /*
2187          * Protect against the user destroying conn_id from another thread
2188          * until we're done accessing it.
2189          */
2190         atomic_inc(&conn_id->refcount);
2191         ret = conn_id->id.event_handler(&conn_id->id, &event);
2192         if (ret)
2193                 goto err3;
2194         /*
2195          * Acquire mutex to prevent user executing rdma_destroy_id()
2196          * while we're accessing the cm_id.
2197          */
2198         mutex_lock(&lock);
2199         if (cma_comp(conn_id, RDMA_CM_CONNECT) &&
2200             (conn_id->id.qp_type != IB_QPT_UD))
2201                 ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
2202         mutex_unlock(&lock);
2203         mutex_unlock(&conn_id->handler_mutex);
2204         mutex_unlock(&listen_id->handler_mutex);
2205         cma_deref_id(conn_id);
2206         if (net_dev)
2207                 dev_put(net_dev);
2208         return 0;
2209
2210 err3:
2211         cma_deref_id(conn_id);
2212         /* Destroy the CM ID by returning a non-zero value. */
2213         conn_id->cm_id.ib = NULL;
2214 err2:
2215         cma_exch(conn_id, RDMA_CM_DESTROYING);
2216         mutex_unlock(&conn_id->handler_mutex);
2217 err1:
2218         mutex_unlock(&listen_id->handler_mutex);
2219         if (conn_id)
2220                 rdma_destroy_id(&conn_id->id);
2221
2222 net_dev_put:
2223         if (net_dev)
2224                 dev_put(net_dev);
2225
2226         return ret;
2227 }
2228
2229 __be64 rdma_get_service_id(struct rdma_cm_id *id, struct sockaddr *addr)
2230 {
2231         if (addr->sa_family == AF_IB)
2232                 return ((struct sockaddr_ib *) addr)->sib_sid;
2233
2234         return cpu_to_be64(((u64)id->ps << 16) + be16_to_cpu(cma_port(addr)));
2235 }
2236 EXPORT_SYMBOL(rdma_get_service_id);
2237
2238 void rdma_read_gids(struct rdma_cm_id *cm_id, union ib_gid *sgid,
2239                     union ib_gid *dgid)
2240 {
2241         struct rdma_addr *addr = &cm_id->route.addr;
2242
2243         if (!cm_id->device) {
2244                 if (sgid)
2245                         memset(sgid, 0, sizeof(*sgid));
2246                 if (dgid)
2247                         memset(dgid, 0, sizeof(*dgid));
2248                 return;
2249         }
2250
2251         if (rdma_protocol_roce(cm_id->device, cm_id->port_num)) {
2252                 if (sgid)
2253                         rdma_ip2gid((struct sockaddr *)&addr->src_addr, sgid);
2254                 if (dgid)
2255                         rdma_ip2gid((struct sockaddr *)&addr->dst_addr, dgid);
2256         } else {
2257                 if (sgid)
2258                         rdma_addr_get_sgid(&addr->dev_addr, sgid);
2259                 if (dgid)
2260                         rdma_addr_get_dgid(&addr->dev_addr, dgid);
2261         }
2262 }
2263 EXPORT_SYMBOL(rdma_read_gids);
2264
2265 static int cma_iw_handler(struct iw_cm_id *iw_id, struct iw_cm_event *iw_event)
2266 {
2267         struct rdma_id_private *id_priv = iw_id->context;
2268         struct rdma_cm_event event = {};
2269         int ret = 0;
2270         struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr;
2271         struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr;
2272
2273         mutex_lock(&id_priv->handler_mutex);
2274         if (id_priv->state != RDMA_CM_CONNECT)
2275                 goto out;
2276
2277         switch (iw_event->event) {
2278         case IW_CM_EVENT_CLOSE:
2279                 event.event = RDMA_CM_EVENT_DISCONNECTED;
2280                 break;
2281         case IW_CM_EVENT_CONNECT_REPLY:
2282                 memcpy(cma_src_addr(id_priv), laddr,
2283                        rdma_addr_size(laddr));
2284                 memcpy(cma_dst_addr(id_priv), raddr,
2285                        rdma_addr_size(raddr));
2286                 switch (iw_event->status) {
2287                 case 0:
2288                         event.event = RDMA_CM_EVENT_ESTABLISHED;
2289                         event.param.conn.initiator_depth = iw_event->ird;
2290                         event.param.conn.responder_resources = iw_event->ord;
2291                         break;
2292                 case -ECONNRESET:
2293                 case -ECONNREFUSED:
2294                         event.event = RDMA_CM_EVENT_REJECTED;
2295                         break;
2296                 case -ETIMEDOUT:
2297                         event.event = RDMA_CM_EVENT_UNREACHABLE;
2298                         break;
2299                 default:
2300                         event.event = RDMA_CM_EVENT_CONNECT_ERROR;
2301                         break;
2302                 }
2303                 break;
2304         case IW_CM_EVENT_ESTABLISHED:
2305                 event.event = RDMA_CM_EVENT_ESTABLISHED;
2306                 event.param.conn.initiator_depth = iw_event->ird;
2307                 event.param.conn.responder_resources = iw_event->ord;
2308                 break;
2309         default:
2310                 goto out;
2311         }
2312
2313         event.status = iw_event->status;
2314         event.param.conn.private_data = iw_event->private_data;
2315         event.param.conn.private_data_len = iw_event->private_data_len;
2316         ret = id_priv->id.event_handler(&id_priv->id, &event);
2317         if (ret) {
2318                 /* Destroy the CM ID by returning a non-zero value. */
2319                 id_priv->cm_id.iw = NULL;
2320                 cma_exch(id_priv, RDMA_CM_DESTROYING);
2321                 mutex_unlock(&id_priv->handler_mutex);
2322                 rdma_destroy_id(&id_priv->id);
2323                 return ret;
2324         }
2325
2326 out:
2327         mutex_unlock(&id_priv->handler_mutex);
2328         return ret;
2329 }
2330
2331 static int iw_conn_req_handler(struct iw_cm_id *cm_id,
2332                                struct iw_cm_event *iw_event)
2333 {
2334         struct rdma_cm_id *new_cm_id;
2335         struct rdma_id_private *listen_id, *conn_id;
2336         struct rdma_cm_event event = {};
2337         int ret = -ECONNABORTED;
2338         struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr;
2339         struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr;
2340
2341         event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
2342         event.param.conn.private_data = iw_event->private_data;
2343         event.param.conn.private_data_len = iw_event->private_data_len;
2344         event.param.conn.initiator_depth = iw_event->ird;
2345         event.param.conn.responder_resources = iw_event->ord;
2346
2347         listen_id = cm_id->context;
2348
2349         mutex_lock(&listen_id->handler_mutex);
2350         if (listen_id->state != RDMA_CM_LISTEN)
2351                 goto out;
2352
2353         /* Create a new RDMA id for the new IW CM ID */
2354         new_cm_id = __rdma_create_id(listen_id->id.route.addr.dev_addr.net,
2355                                      listen_id->id.event_handler,
2356                                      listen_id->id.context,
2357                                      RDMA_PS_TCP, IB_QPT_RC,
2358                                      listen_id->res.kern_name);
2359         if (IS_ERR(new_cm_id)) {
2360                 ret = -ENOMEM;
2361                 goto out;
2362         }
2363         conn_id = container_of(new_cm_id, struct rdma_id_private, id);
2364         mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
2365         conn_id->state = RDMA_CM_CONNECT;
2366
2367         ret = rdma_translate_ip(laddr, &conn_id->id.route.addr.dev_addr);
2368         if (ret) {
2369                 mutex_unlock(&conn_id->handler_mutex);
2370                 rdma_destroy_id(new_cm_id);
2371                 goto out;
2372         }
2373
2374         ret = cma_iw_acquire_dev(conn_id, listen_id);
2375         if (ret) {
2376                 mutex_unlock(&conn_id->handler_mutex);
2377                 rdma_destroy_id(new_cm_id);
2378                 goto out;
2379         }
2380
2381         conn_id->cm_id.iw = cm_id;
2382         cm_id->context = conn_id;
2383         cm_id->cm_handler = cma_iw_handler;
2384
2385         memcpy(cma_src_addr(conn_id), laddr, rdma_addr_size(laddr));
2386         memcpy(cma_dst_addr(conn_id), raddr, rdma_addr_size(raddr));
2387
2388         /*
2389          * Protect against the user destroying conn_id from another thread
2390          * until we're done accessing it.
2391          */
2392         atomic_inc(&conn_id->refcount);
2393         ret = conn_id->id.event_handler(&conn_id->id, &event);
2394         if (ret) {
2395                 /* User wants to destroy the CM ID */
2396                 conn_id->cm_id.iw = NULL;
2397                 cma_exch(conn_id, RDMA_CM_DESTROYING);
2398                 mutex_unlock(&conn_id->handler_mutex);
2399                 cma_deref_id(conn_id);
2400                 rdma_destroy_id(&conn_id->id);
2401                 goto out;
2402         }
2403
2404         mutex_unlock(&conn_id->handler_mutex);
2405         cma_deref_id(conn_id);
2406
2407 out:
2408         mutex_unlock(&listen_id->handler_mutex);
2409         return ret;
2410 }
2411
2412 static int cma_ib_listen(struct rdma_id_private *id_priv)
2413 {
2414         struct sockaddr *addr;
2415         struct ib_cm_id *id;
2416         __be64 svc_id;
2417
2418         addr = cma_src_addr(id_priv);
2419         svc_id = rdma_get_service_id(&id_priv->id, addr);
2420         id = ib_cm_insert_listen(id_priv->id.device,
2421                                  cma_ib_req_handler, svc_id);
2422         if (IS_ERR(id))
2423                 return PTR_ERR(id);
2424         id_priv->cm_id.ib = id;
2425
2426         return 0;
2427 }
2428
2429 static int cma_iw_listen(struct rdma_id_private *id_priv, int backlog)
2430 {
2431         int ret;
2432         struct iw_cm_id *id;
2433
2434         id = iw_create_cm_id(id_priv->id.device,
2435                              iw_conn_req_handler,
2436                              id_priv);
2437         if (IS_ERR(id))
2438                 return PTR_ERR(id);
2439
2440         id->tos = id_priv->tos;
2441         id->tos_set = id_priv->tos_set;
2442         id_priv->cm_id.iw = id;
2443
2444         memcpy(&id_priv->cm_id.iw->local_addr, cma_src_addr(id_priv),
2445                rdma_addr_size(cma_src_addr(id_priv)));
2446
2447         ret = iw_cm_listen(id_priv->cm_id.iw, backlog);
2448
2449         if (ret) {
2450                 iw_destroy_cm_id(id_priv->cm_id.iw);
2451                 id_priv->cm_id.iw = NULL;
2452         }
2453
2454         return ret;
2455 }
2456
2457 static int cma_listen_handler(struct rdma_cm_id *id,
2458                               struct rdma_cm_event *event)
2459 {
2460         struct rdma_id_private *id_priv = id->context;
2461
2462         id->context = id_priv->id.context;
2463         id->event_handler = id_priv->id.event_handler;
2464         return id_priv->id.event_handler(id, event);
2465 }
2466
2467 static void cma_listen_on_dev(struct rdma_id_private *id_priv,
2468                               struct cma_device *cma_dev)
2469 {
2470         struct rdma_id_private *dev_id_priv;
2471         struct rdma_cm_id *id;
2472         struct net *net = id_priv->id.route.addr.dev_addr.net;
2473         int ret;
2474
2475         if (cma_family(id_priv) == AF_IB && !rdma_cap_ib_cm(cma_dev->device, 1))
2476                 return;
2477
2478         id = __rdma_create_id(net, cma_listen_handler, id_priv, id_priv->id.ps,
2479                               id_priv->id.qp_type, id_priv->res.kern_name);
2480         if (IS_ERR(id))
2481                 return;
2482
2483         dev_id_priv = container_of(id, struct rdma_id_private, id);
2484
2485         dev_id_priv->state = RDMA_CM_ADDR_BOUND;
2486         memcpy(cma_src_addr(dev_id_priv), cma_src_addr(id_priv),
2487                rdma_addr_size(cma_src_addr(id_priv)));
2488
2489         _cma_attach_to_dev(dev_id_priv, cma_dev);
2490         list_add_tail(&dev_id_priv->listen_list, &id_priv->listen_list);
2491         atomic_inc(&id_priv->refcount);
2492         dev_id_priv->internal_id = 1;
2493         dev_id_priv->afonly = id_priv->afonly;
2494         dev_id_priv->tos_set = id_priv->tos_set;
2495         dev_id_priv->tos = id_priv->tos;
2496
2497         ret = rdma_listen(id, id_priv->backlog);
2498         if (ret)
2499                 dev_warn(&cma_dev->device->dev,
2500                          "RDMA CMA: cma_listen_on_dev, error %d\n", ret);
2501 }
2502
2503 static void cma_listen_on_all(struct rdma_id_private *id_priv)
2504 {
2505         struct cma_device *cma_dev;
2506
2507         mutex_lock(&lock);
2508         list_add_tail(&id_priv->list, &listen_any_list);
2509         list_for_each_entry(cma_dev, &dev_list, list)
2510                 cma_listen_on_dev(id_priv, cma_dev);
2511         mutex_unlock(&lock);
2512 }
2513
2514 void rdma_set_service_type(struct rdma_cm_id *id, int tos)
2515 {
2516         struct rdma_id_private *id_priv;
2517
2518         id_priv = container_of(id, struct rdma_id_private, id);
2519         id_priv->tos = (u8) tos;
2520         id_priv->tos_set = true;
2521 }
2522 EXPORT_SYMBOL(rdma_set_service_type);
2523
2524 /**
2525  * rdma_set_ack_timeout() - Set the ack timeout of QP associated
2526  *                          with a connection identifier.
2527  * @id: Communication identifier to associated with service type.
2528  * @timeout: Ack timeout to set a QP, expressed as 4.096 * 2^(timeout) usec.
2529  *
2530  * This function should be called before rdma_connect() on active side,
2531  * and on passive side before rdma_accept(). It is applicable to primary
2532  * path only. The timeout will affect the local side of the QP, it is not
2533  * negotiated with remote side and zero disables the timer.
2534  *
2535  * Return: 0 for success
2536  */
2537 int rdma_set_ack_timeout(struct rdma_cm_id *id, u8 timeout)
2538 {
2539         struct rdma_id_private *id_priv;
2540
2541         if (id->qp_type != IB_QPT_RC)
2542                 return -EINVAL;
2543
2544         id_priv = container_of(id, struct rdma_id_private, id);
2545         id_priv->timeout = timeout;
2546         id_priv->timeout_set = true;
2547
2548         return 0;
2549 }
2550 EXPORT_SYMBOL(rdma_set_ack_timeout);
2551
2552 static void cma_query_handler(int status, struct sa_path_rec *path_rec,
2553                               void *context)
2554 {
2555         struct cma_work *work = context;
2556         struct rdma_route *route;
2557
2558         route = &work->id->id.route;
2559
2560         if (!status) {
2561                 route->num_paths = 1;
2562                 *route->path_rec = *path_rec;
2563         } else {
2564                 work->old_state = RDMA_CM_ROUTE_QUERY;
2565                 work->new_state = RDMA_CM_ADDR_RESOLVED;
2566                 work->event.event = RDMA_CM_EVENT_ROUTE_ERROR;
2567                 work->event.status = status;
2568                 pr_debug_ratelimited("RDMA CM: ROUTE_ERROR: failed to query path. status %d\n",
2569                                      status);
2570         }
2571
2572         queue_work(cma_wq, &work->work);
2573 }
2574
2575 static int cma_query_ib_route(struct rdma_id_private *id_priv,
2576                               unsigned long timeout_ms, struct cma_work *work)
2577 {
2578         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
2579         struct sa_path_rec path_rec;
2580         ib_sa_comp_mask comp_mask;
2581         struct sockaddr_in6 *sin6;
2582         struct sockaddr_ib *sib;
2583
2584         memset(&path_rec, 0, sizeof path_rec);
2585
2586         if (rdma_cap_opa_ah(id_priv->id.device, id_priv->id.port_num))
2587                 path_rec.rec_type = SA_PATH_REC_TYPE_OPA;
2588         else
2589                 path_rec.rec_type = SA_PATH_REC_TYPE_IB;
2590         rdma_addr_get_sgid(dev_addr, &path_rec.sgid);
2591         rdma_addr_get_dgid(dev_addr, &path_rec.dgid);
2592         path_rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
2593         path_rec.numb_path = 1;
2594         path_rec.reversible = 1;
2595         path_rec.service_id = rdma_get_service_id(&id_priv->id,
2596                                                   cma_dst_addr(id_priv));
2597
2598         comp_mask = IB_SA_PATH_REC_DGID | IB_SA_PATH_REC_SGID |
2599                     IB_SA_PATH_REC_PKEY | IB_SA_PATH_REC_NUMB_PATH |
2600                     IB_SA_PATH_REC_REVERSIBLE | IB_SA_PATH_REC_SERVICE_ID;
2601
2602         switch (cma_family(id_priv)) {
2603         case AF_INET:
2604                 path_rec.qos_class = cpu_to_be16((u16) id_priv->tos);
2605                 comp_mask |= IB_SA_PATH_REC_QOS_CLASS;
2606                 break;
2607         case AF_INET6:
2608                 sin6 = (struct sockaddr_in6 *) cma_src_addr(id_priv);
2609                 path_rec.traffic_class = (u8) (be32_to_cpu(sin6->sin6_flowinfo) >> 20);
2610                 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
2611                 break;
2612         case AF_IB:
2613                 sib = (struct sockaddr_ib *) cma_src_addr(id_priv);
2614                 path_rec.traffic_class = (u8) (be32_to_cpu(sib->sib_flowinfo) >> 20);
2615                 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
2616                 break;
2617         }
2618
2619         id_priv->query_id = ib_sa_path_rec_get(&sa_client, id_priv->id.device,
2620                                                id_priv->id.port_num, &path_rec,
2621                                                comp_mask, timeout_ms,
2622                                                GFP_KERNEL, cma_query_handler,
2623                                                work, &id_priv->query);
2624
2625         return (id_priv->query_id < 0) ? id_priv->query_id : 0;
2626 }
2627
2628 static void cma_work_handler(struct work_struct *_work)
2629 {
2630         struct cma_work *work = container_of(_work, struct cma_work, work);
2631         struct rdma_id_private *id_priv = work->id;
2632         int destroy = 0;
2633
2634         mutex_lock(&id_priv->handler_mutex);
2635         if (!cma_comp_exch(id_priv, work->old_state, work->new_state))
2636                 goto out;
2637
2638         if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
2639                 cma_exch(id_priv, RDMA_CM_DESTROYING);
2640                 destroy = 1;
2641         }
2642 out:
2643         mutex_unlock(&id_priv->handler_mutex);
2644         cma_deref_id(id_priv);
2645         if (destroy)
2646                 rdma_destroy_id(&id_priv->id);
2647         kfree(work);
2648 }
2649
2650 static void cma_ndev_work_handler(struct work_struct *_work)
2651 {
2652         struct cma_ndev_work *work = container_of(_work, struct cma_ndev_work, work);
2653         struct rdma_id_private *id_priv = work->id;
2654         int destroy = 0;
2655
2656         mutex_lock(&id_priv->handler_mutex);
2657         if (id_priv->state == RDMA_CM_DESTROYING ||
2658             id_priv->state == RDMA_CM_DEVICE_REMOVAL)
2659                 goto out;
2660
2661         if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
2662                 cma_exch(id_priv, RDMA_CM_DESTROYING);
2663                 destroy = 1;
2664         }
2665
2666 out:
2667         mutex_unlock(&id_priv->handler_mutex);
2668         cma_deref_id(id_priv);
2669         if (destroy)
2670                 rdma_destroy_id(&id_priv->id);
2671         kfree(work);
2672 }
2673
2674 static void cma_init_resolve_route_work(struct cma_work *work,
2675                                         struct rdma_id_private *id_priv)
2676 {
2677         work->id = id_priv;
2678         INIT_WORK(&work->work, cma_work_handler);
2679         work->old_state = RDMA_CM_ROUTE_QUERY;
2680         work->new_state = RDMA_CM_ROUTE_RESOLVED;
2681         work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
2682 }
2683
2684 static void cma_init_resolve_addr_work(struct cma_work *work,
2685                                        struct rdma_id_private *id_priv)
2686 {
2687         work->id = id_priv;
2688         INIT_WORK(&work->work, cma_work_handler);
2689         work->old_state = RDMA_CM_ADDR_QUERY;
2690         work->new_state = RDMA_CM_ADDR_RESOLVED;
2691         work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
2692 }
2693
2694 static int cma_resolve_ib_route(struct rdma_id_private *id_priv,
2695                                 unsigned long timeout_ms)
2696 {
2697         struct rdma_route *route = &id_priv->id.route;
2698         struct cma_work *work;
2699         int ret;
2700
2701         work = kzalloc(sizeof *work, GFP_KERNEL);
2702         if (!work)
2703                 return -ENOMEM;
2704
2705         cma_init_resolve_route_work(work, id_priv);
2706
2707         route->path_rec = kmalloc(sizeof *route->path_rec, GFP_KERNEL);
2708         if (!route->path_rec) {
2709                 ret = -ENOMEM;
2710                 goto err1;
2711         }
2712
2713         ret = cma_query_ib_route(id_priv, timeout_ms, work);
2714         if (ret)
2715                 goto err2;
2716
2717         return 0;
2718 err2:
2719         kfree(route->path_rec);
2720         route->path_rec = NULL;
2721 err1:
2722         kfree(work);
2723         return ret;
2724 }
2725
2726 static enum ib_gid_type cma_route_gid_type(enum rdma_network_type network_type,
2727                                            unsigned long supported_gids,
2728                                            enum ib_gid_type default_gid)
2729 {
2730         if ((network_type == RDMA_NETWORK_IPV4 ||
2731              network_type == RDMA_NETWORK_IPV6) &&
2732             test_bit(IB_GID_TYPE_ROCE_UDP_ENCAP, &supported_gids))
2733                 return IB_GID_TYPE_ROCE_UDP_ENCAP;
2734
2735         return default_gid;
2736 }
2737
2738 /*
2739  * cma_iboe_set_path_rec_l2_fields() is helper function which sets
2740  * path record type based on GID type.
2741  * It also sets up other L2 fields which includes destination mac address
2742  * netdev ifindex, of the path record.
2743  * It returns the netdev of the bound interface for this path record entry.
2744  */
2745 static struct net_device *
2746 cma_iboe_set_path_rec_l2_fields(struct rdma_id_private *id_priv)
2747 {
2748         struct rdma_route *route = &id_priv->id.route;
2749         enum ib_gid_type gid_type = IB_GID_TYPE_ROCE;
2750         struct rdma_addr *addr = &route->addr;
2751         unsigned long supported_gids;
2752         struct net_device *ndev;
2753
2754         if (!addr->dev_addr.bound_dev_if)
2755                 return NULL;
2756
2757         ndev = dev_get_by_index(addr->dev_addr.net,
2758                                 addr->dev_addr.bound_dev_if);
2759         if (!ndev)
2760                 return NULL;
2761
2762         supported_gids = roce_gid_type_mask_support(id_priv->id.device,
2763                                                     id_priv->id.port_num);
2764         gid_type = cma_route_gid_type(addr->dev_addr.network,
2765                                       supported_gids,
2766                                       id_priv->gid_type);
2767         /* Use the hint from IP Stack to select GID Type */
2768         if (gid_type < ib_network_to_gid_type(addr->dev_addr.network))
2769                 gid_type = ib_network_to_gid_type(addr->dev_addr.network);
2770         route->path_rec->rec_type = sa_conv_gid_to_pathrec_type(gid_type);
2771
2772         route->path_rec->roce.route_resolved = true;
2773         sa_path_set_dmac(route->path_rec, addr->dev_addr.dst_dev_addr);
2774         return ndev;
2775 }
2776
2777 int rdma_set_ib_path(struct rdma_cm_id *id,
2778                      struct sa_path_rec *path_rec)
2779 {
2780         struct rdma_id_private *id_priv;
2781         struct net_device *ndev;
2782         int ret;
2783
2784         id_priv = container_of(id, struct rdma_id_private, id);
2785         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
2786                            RDMA_CM_ROUTE_RESOLVED))
2787                 return -EINVAL;
2788
2789         id->route.path_rec = kmemdup(path_rec, sizeof(*path_rec),
2790                                      GFP_KERNEL);
2791         if (!id->route.path_rec) {
2792                 ret = -ENOMEM;
2793                 goto err;
2794         }
2795
2796         if (rdma_protocol_roce(id->device, id->port_num)) {
2797                 ndev = cma_iboe_set_path_rec_l2_fields(id_priv);
2798                 if (!ndev) {
2799                         ret = -ENODEV;
2800                         goto err_free;
2801                 }
2802                 dev_put(ndev);
2803         }
2804
2805         id->route.num_paths = 1;
2806         return 0;
2807
2808 err_free:
2809         kfree(id->route.path_rec);
2810         id->route.path_rec = NULL;
2811 err:
2812         cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_ADDR_RESOLVED);
2813         return ret;
2814 }
2815 EXPORT_SYMBOL(rdma_set_ib_path);
2816
2817 static int cma_resolve_iw_route(struct rdma_id_private *id_priv)
2818 {
2819         struct cma_work *work;
2820
2821         work = kzalloc(sizeof *work, GFP_KERNEL);
2822         if (!work)
2823                 return -ENOMEM;
2824
2825         cma_init_resolve_route_work(work, id_priv);
2826         queue_work(cma_wq, &work->work);
2827         return 0;
2828 }
2829
2830 static int iboe_tos_to_sl(struct net_device *ndev, int tos)
2831 {
2832         int prio;
2833         struct net_device *dev;
2834
2835         prio = rt_tos2priority(tos);
2836         dev = is_vlan_dev(ndev) ? vlan_dev_real_dev(ndev) : ndev;
2837         if (dev->num_tc)
2838                 return netdev_get_prio_tc_map(dev, prio);
2839
2840 #if IS_ENABLED(CONFIG_VLAN_8021Q)
2841         if (is_vlan_dev(ndev))
2842                 return (vlan_dev_get_egress_qos_mask(ndev, prio) &
2843                         VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
2844 #endif
2845         return 0;
2846 }
2847
2848 static int cma_resolve_iboe_route(struct rdma_id_private *id_priv)
2849 {
2850         struct rdma_route *route = &id_priv->id.route;
2851         struct rdma_addr *addr = &route->addr;
2852         struct cma_work *work;
2853         int ret;
2854         struct net_device *ndev;
2855
2856         u8 default_roce_tos = id_priv->cma_dev->default_roce_tos[id_priv->id.port_num -
2857                                         rdma_start_port(id_priv->cma_dev->device)];
2858         u8 tos = id_priv->tos_set ? id_priv->tos : default_roce_tos;
2859
2860
2861         work = kzalloc(sizeof *work, GFP_KERNEL);
2862         if (!work)
2863                 return -ENOMEM;
2864
2865         route->path_rec = kzalloc(sizeof *route->path_rec, GFP_KERNEL);
2866         if (!route->path_rec) {
2867                 ret = -ENOMEM;
2868                 goto err1;
2869         }
2870
2871         route->num_paths = 1;
2872
2873         ndev = cma_iboe_set_path_rec_l2_fields(id_priv);
2874         if (!ndev) {
2875                 ret = -ENODEV;
2876                 goto err2;
2877         }
2878
2879         rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
2880                     &route->path_rec->sgid);
2881         rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.dst_addr,
2882                     &route->path_rec->dgid);
2883
2884         if (((struct sockaddr *)&id_priv->id.route.addr.dst_addr)->sa_family != AF_IB)
2885                 /* TODO: get the hoplimit from the inet/inet6 device */
2886                 route->path_rec->hop_limit = addr->dev_addr.hoplimit;
2887         else
2888                 route->path_rec->hop_limit = 1;
2889         route->path_rec->reversible = 1;
2890         route->path_rec->pkey = cpu_to_be16(0xffff);
2891         route->path_rec->mtu_selector = IB_SA_EQ;
2892         route->path_rec->sl = iboe_tos_to_sl(ndev, tos);
2893         route->path_rec->traffic_class = tos;
2894         route->path_rec->mtu = iboe_get_mtu(ndev->mtu);
2895         route->path_rec->rate_selector = IB_SA_EQ;
2896         route->path_rec->rate = iboe_get_rate(ndev);
2897         dev_put(ndev);
2898         route->path_rec->packet_life_time_selector = IB_SA_EQ;
2899         route->path_rec->packet_life_time = CMA_IBOE_PACKET_LIFETIME;
2900         if (!route->path_rec->mtu) {
2901                 ret = -EINVAL;
2902                 goto err2;
2903         }
2904
2905         cma_init_resolve_route_work(work, id_priv);
2906         queue_work(cma_wq, &work->work);
2907
2908         return 0;
2909
2910 err2:
2911         kfree(route->path_rec);
2912         route->path_rec = NULL;
2913 err1:
2914         kfree(work);
2915         return ret;
2916 }
2917
2918 int rdma_resolve_route(struct rdma_cm_id *id, unsigned long timeout_ms)
2919 {
2920         struct rdma_id_private *id_priv;
2921         int ret;
2922
2923         id_priv = container_of(id, struct rdma_id_private, id);
2924         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED, RDMA_CM_ROUTE_QUERY))
2925                 return -EINVAL;
2926
2927         atomic_inc(&id_priv->refcount);
2928         if (rdma_cap_ib_sa(id->device, id->port_num))
2929                 ret = cma_resolve_ib_route(id_priv, timeout_ms);
2930         else if (rdma_protocol_roce(id->device, id->port_num))
2931                 ret = cma_resolve_iboe_route(id_priv);
2932         else if (rdma_protocol_iwarp(id->device, id->port_num))
2933                 ret = cma_resolve_iw_route(id_priv);
2934         else
2935                 ret = -ENOSYS;
2936
2937         if (ret)
2938                 goto err;
2939
2940         return 0;
2941 err:
2942         cma_comp_exch(id_priv, RDMA_CM_ROUTE_QUERY, RDMA_CM_ADDR_RESOLVED);
2943         cma_deref_id(id_priv);
2944         return ret;
2945 }
2946 EXPORT_SYMBOL(rdma_resolve_route);
2947
2948 static void cma_set_loopback(struct sockaddr *addr)
2949 {
2950         switch (addr->sa_family) {
2951         case AF_INET:
2952                 ((struct sockaddr_in *) addr)->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
2953                 break;
2954         case AF_INET6:
2955                 ipv6_addr_set(&((struct sockaddr_in6 *) addr)->sin6_addr,
2956                               0, 0, 0, htonl(1));
2957                 break;
2958         default:
2959                 ib_addr_set(&((struct sockaddr_ib *) addr)->sib_addr,
2960                             0, 0, 0, htonl(1));
2961                 break;
2962         }
2963 }
2964
2965 static int cma_bind_loopback(struct rdma_id_private *id_priv)
2966 {
2967         struct cma_device *cma_dev, *cur_dev;
2968         union ib_gid gid;
2969         enum ib_port_state port_state;
2970         u16 pkey;
2971         int ret;
2972         u8 p;
2973
2974         cma_dev = NULL;
2975         mutex_lock(&lock);
2976         list_for_each_entry(cur_dev, &dev_list, list) {
2977                 if (cma_family(id_priv) == AF_IB &&
2978                     !rdma_cap_ib_cm(cur_dev->device, 1))
2979                         continue;
2980
2981                 if (!cma_dev)
2982                         cma_dev = cur_dev;
2983
2984                 for (p = 1; p <= cur_dev->device->phys_port_cnt; ++p) {
2985                         if (!ib_get_cached_port_state(cur_dev->device, p, &port_state) &&
2986                             port_state == IB_PORT_ACTIVE) {
2987                                 cma_dev = cur_dev;
2988                                 goto port_found;
2989                         }
2990                 }
2991         }
2992
2993         if (!cma_dev) {
2994                 ret = -ENODEV;
2995                 goto out;
2996         }
2997
2998         p = 1;
2999
3000 port_found:
3001         ret = rdma_query_gid(cma_dev->device, p, 0, &gid);
3002         if (ret)
3003                 goto out;
3004
3005         ret = ib_get_cached_pkey(cma_dev->device, p, 0, &pkey);
3006         if (ret)
3007                 goto out;
3008
3009         id_priv->id.route.addr.dev_addr.dev_type =
3010                 (rdma_protocol_ib(cma_dev->device, p)) ?
3011                 ARPHRD_INFINIBAND : ARPHRD_ETHER;
3012
3013         rdma_addr_set_sgid(&id_priv->id.route.addr.dev_addr, &gid);
3014         ib_addr_set_pkey(&id_priv->id.route.addr.dev_addr, pkey);
3015         id_priv->id.port_num = p;
3016         cma_attach_to_dev(id_priv, cma_dev);
3017         cma_set_loopback(cma_src_addr(id_priv));
3018 out:
3019         mutex_unlock(&lock);
3020         return ret;
3021 }
3022
3023 static void addr_handler(int status, struct sockaddr *src_addr,
3024                          struct rdma_dev_addr *dev_addr, void *context)
3025 {
3026         struct rdma_id_private *id_priv = context;
3027         struct rdma_cm_event event = {};
3028         struct sockaddr *addr;
3029         struct sockaddr_storage old_addr;
3030
3031         mutex_lock(&id_priv->handler_mutex);
3032         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY,
3033                            RDMA_CM_ADDR_RESOLVED))
3034                 goto out;
3035
3036         /*
3037          * Store the previous src address, so that if we fail to acquire
3038          * matching rdma device, old address can be restored back, which helps
3039          * to cancel the cma listen operation correctly.
3040          */
3041         addr = cma_src_addr(id_priv);
3042         memcpy(&old_addr, addr, rdma_addr_size(addr));
3043         memcpy(addr, src_addr, rdma_addr_size(src_addr));
3044         if (!status && !id_priv->cma_dev) {
3045                 status = cma_acquire_dev_by_src_ip(id_priv);
3046                 if (status)
3047                         pr_debug_ratelimited("RDMA CM: ADDR_ERROR: failed to acquire device. status %d\n",
3048                                              status);
3049         } else if (status) {
3050                 pr_debug_ratelimited("RDMA CM: ADDR_ERROR: failed to resolve IP. status %d\n", status);
3051         }
3052
3053         if (status) {
3054                 memcpy(addr, &old_addr,
3055                        rdma_addr_size((struct sockaddr *)&old_addr));
3056                 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
3057                                    RDMA_CM_ADDR_BOUND))
3058                         goto out;
3059                 event.event = RDMA_CM_EVENT_ADDR_ERROR;
3060                 event.status = status;
3061         } else
3062                 event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
3063
3064         if (id_priv->id.event_handler(&id_priv->id, &event)) {
3065                 cma_exch(id_priv, RDMA_CM_DESTROYING);
3066                 mutex_unlock(&id_priv->handler_mutex);
3067                 rdma_destroy_id(&id_priv->id);
3068                 return;
3069         }
3070 out:
3071         mutex_unlock(&id_priv->handler_mutex);
3072 }
3073
3074 static int cma_resolve_loopback(struct rdma_id_private *id_priv)
3075 {
3076         struct cma_work *work;
3077         union ib_gid gid;
3078         int ret;
3079
3080         work = kzalloc(sizeof *work, GFP_KERNEL);
3081         if (!work)
3082                 return -ENOMEM;
3083
3084         if (!id_priv->cma_dev) {
3085                 ret = cma_bind_loopback(id_priv);
3086                 if (ret)
3087                         goto err;
3088         }
3089
3090         rdma_addr_get_sgid(&id_priv->id.route.addr.dev_addr, &gid);
3091         rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, &gid);
3092
3093         cma_init_resolve_addr_work(work, id_priv);
3094         queue_work(cma_wq, &work->work);
3095         return 0;
3096 err:
3097         kfree(work);
3098         return ret;
3099 }
3100
3101 static int cma_resolve_ib_addr(struct rdma_id_private *id_priv)
3102 {
3103         struct cma_work *work;
3104         int ret;
3105
3106         work = kzalloc(sizeof *work, GFP_KERNEL);
3107         if (!work)
3108                 return -ENOMEM;
3109
3110         if (!id_priv->cma_dev) {
3111                 ret = cma_resolve_ib_dev(id_priv);
3112                 if (ret)
3113                         goto err;
3114         }
3115
3116         rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, (union ib_gid *)
3117                 &(((struct sockaddr_ib *) &id_priv->id.route.addr.dst_addr)->sib_addr));
3118
3119         cma_init_resolve_addr_work(work, id_priv);
3120         queue_work(cma_wq, &work->work);
3121         return 0;
3122 err:
3123         kfree(work);
3124         return ret;
3125 }
3126
3127 static int cma_bind_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
3128                          const struct sockaddr *dst_addr)
3129 {
3130         if (!src_addr || !src_addr->sa_family) {
3131                 src_addr = (struct sockaddr *) &id->route.addr.src_addr;
3132                 src_addr->sa_family = dst_addr->sa_family;
3133                 if (IS_ENABLED(CONFIG_IPV6) &&
3134                     dst_addr->sa_family == AF_INET6) {
3135                         struct sockaddr_in6 *src_addr6 = (struct sockaddr_in6 *) src_addr;
3136                         struct sockaddr_in6 *dst_addr6 = (struct sockaddr_in6 *) dst_addr;
3137                         src_addr6->sin6_scope_id = dst_addr6->sin6_scope_id;
3138                         if (ipv6_addr_type(&dst_addr6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
3139                                 id->route.addr.dev_addr.bound_dev_if = dst_addr6->sin6_scope_id;
3140                 } else if (dst_addr->sa_family == AF_IB) {
3141                         ((struct sockaddr_ib *) src_addr)->sib_pkey =
3142                                 ((struct sockaddr_ib *) dst_addr)->sib_pkey;
3143                 }
3144         }
3145         return rdma_bind_addr(id, src_addr);
3146 }
3147
3148 int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
3149                       const struct sockaddr *dst_addr, unsigned long timeout_ms)
3150 {
3151         struct rdma_id_private *id_priv;
3152         int ret;
3153
3154         id_priv = container_of(id, struct rdma_id_private, id);
3155         if (id_priv->state == RDMA_CM_IDLE) {
3156                 ret = cma_bind_addr(id, src_addr, dst_addr);
3157                 if (ret)
3158                         return ret;
3159         }
3160
3161         if (cma_family(id_priv) != dst_addr->sa_family)
3162                 return -EINVAL;
3163
3164         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_ADDR_QUERY))
3165                 return -EINVAL;
3166
3167         memcpy(cma_dst_addr(id_priv), dst_addr, rdma_addr_size(dst_addr));
3168         if (cma_any_addr(dst_addr)) {
3169                 ret = cma_resolve_loopback(id_priv);
3170         } else {
3171                 if (dst_addr->sa_family == AF_IB) {
3172                         ret = cma_resolve_ib_addr(id_priv);
3173                 } else {
3174                         ret = rdma_resolve_ip(cma_src_addr(id_priv), dst_addr,
3175                                               &id->route.addr.dev_addr,
3176                                               timeout_ms, addr_handler,
3177                                               false, id_priv);
3178                 }
3179         }
3180         if (ret)
3181                 goto err;
3182
3183         return 0;
3184 err:
3185         cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY, RDMA_CM_ADDR_BOUND);
3186         return ret;
3187 }
3188 EXPORT_SYMBOL(rdma_resolve_addr);
3189
3190 int rdma_set_reuseaddr(struct rdma_cm_id *id, int reuse)
3191 {
3192         struct rdma_id_private *id_priv;
3193         unsigned long flags;
3194         int ret;
3195
3196         id_priv = container_of(id, struct rdma_id_private, id);
3197         spin_lock_irqsave(&id_priv->lock, flags);
3198         if (reuse || id_priv->state == RDMA_CM_IDLE) {
3199                 id_priv->reuseaddr = reuse;
3200                 ret = 0;
3201         } else {
3202                 ret = -EINVAL;
3203         }
3204         spin_unlock_irqrestore(&id_priv->lock, flags);
3205         return ret;
3206 }
3207 EXPORT_SYMBOL(rdma_set_reuseaddr);
3208
3209 int rdma_set_afonly(struct rdma_cm_id *id, int afonly)
3210 {
3211         struct rdma_id_private *id_priv;
3212         unsigned long flags;
3213         int ret;
3214
3215         id_priv = container_of(id, struct rdma_id_private, id);
3216         spin_lock_irqsave(&id_priv->lock, flags);
3217         if (id_priv->state == RDMA_CM_IDLE || id_priv->state == RDMA_CM_ADDR_BOUND) {
3218                 id_priv->options |= (1 << CMA_OPTION_AFONLY);
3219                 id_priv->afonly = afonly;
3220                 ret = 0;
3221         } else {
3222                 ret = -EINVAL;
3223         }
3224         spin_unlock_irqrestore(&id_priv->lock, flags);
3225         return ret;
3226 }
3227 EXPORT_SYMBOL(rdma_set_afonly);
3228
3229 static void cma_bind_port(struct rdma_bind_list *bind_list,
3230                           struct rdma_id_private *id_priv)
3231 {
3232         struct sockaddr *addr;
3233         struct sockaddr_ib *sib;
3234         u64 sid, mask;
3235         __be16 port;
3236
3237         addr = cma_src_addr(id_priv);
3238         port = htons(bind_list->port);
3239
3240         switch (addr->sa_family) {
3241         case AF_INET:
3242                 ((struct sockaddr_in *) addr)->sin_port = port;
3243                 break;
3244         case AF_INET6:
3245                 ((struct sockaddr_in6 *) addr)->sin6_port = port;
3246                 break;
3247         case AF_IB:
3248                 sib = (struct sockaddr_ib *) addr;
3249                 sid = be64_to_cpu(sib->sib_sid);
3250                 mask = be64_to_cpu(sib->sib_sid_mask);
3251                 sib->sib_sid = cpu_to_be64((sid & mask) | (u64) ntohs(port));
3252                 sib->sib_sid_mask = cpu_to_be64(~0ULL);
3253                 break;
3254         }
3255         id_priv->bind_list = bind_list;
3256         hlist_add_head(&id_priv->node, &bind_list->owners);
3257 }
3258
3259 static int cma_alloc_port(enum rdma_ucm_port_space ps,
3260                           struct rdma_id_private *id_priv, unsigned short snum)
3261 {
3262         struct rdma_bind_list *bind_list;
3263         int ret;
3264
3265         bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL);
3266         if (!bind_list)
3267                 return -ENOMEM;
3268
3269         ret = cma_ps_alloc(id_priv->id.route.addr.dev_addr.net, ps, bind_list,
3270                            snum);
3271         if (ret < 0)
3272                 goto err;
3273
3274         bind_list->ps = ps;
3275         bind_list->port = snum;
3276         cma_bind_port(bind_list, id_priv);
3277         return 0;
3278 err:
3279         kfree(bind_list);
3280         return ret == -ENOSPC ? -EADDRNOTAVAIL : ret;
3281 }
3282
3283 static int cma_port_is_unique(struct rdma_bind_list *bind_list,
3284                               struct rdma_id_private *id_priv)
3285 {
3286         struct rdma_id_private *cur_id;
3287         struct sockaddr  *daddr = cma_dst_addr(id_priv);
3288         struct sockaddr  *saddr = cma_src_addr(id_priv);
3289         __be16 dport = cma_port(daddr);
3290
3291         hlist_for_each_entry(cur_id, &bind_list->owners, node) {
3292                 struct sockaddr  *cur_daddr = cma_dst_addr(cur_id);
3293                 struct sockaddr  *cur_saddr = cma_src_addr(cur_id);
3294                 __be16 cur_dport = cma_port(cur_daddr);
3295
3296                 if (id_priv == cur_id)
3297                         continue;
3298
3299                 /* different dest port -> unique */
3300                 if (!cma_any_port(daddr) &&
3301                     !cma_any_port(cur_daddr) &&
3302                     (dport != cur_dport))
3303                         continue;
3304
3305                 /* different src address -> unique */
3306                 if (!cma_any_addr(saddr) &&
3307                     !cma_any_addr(cur_saddr) &&
3308                     cma_addr_cmp(saddr, cur_saddr))
3309                         continue;
3310
3311                 /* different dst address -> unique */
3312                 if (!cma_any_addr(daddr) &&
3313                     !cma_any_addr(cur_daddr) &&
3314                     cma_addr_cmp(daddr, cur_daddr))
3315                         continue;
3316
3317                 return -EADDRNOTAVAIL;
3318         }
3319         return 0;
3320 }
3321
3322 static int cma_alloc_any_port(enum rdma_ucm_port_space ps,
3323                               struct rdma_id_private *id_priv)
3324 {
3325         static unsigned int last_used_port;
3326         int low, high, remaining;
3327         unsigned int rover;
3328         struct net *net = id_priv->id.route.addr.dev_addr.net;
3329
3330         inet_get_local_port_range(net, &low, &high);
3331         remaining = (high - low) + 1;
3332         rover = prandom_u32() % remaining + low;
3333 retry:
3334         if (last_used_port != rover) {
3335                 struct rdma_bind_list *bind_list;
3336                 int ret;
3337
3338                 bind_list = cma_ps_find(net, ps, (unsigned short)rover);
3339
3340                 if (!bind_list) {
3341                         ret = cma_alloc_port(ps, id_priv, rover);
3342                 } else {
3343                         ret = cma_port_is_unique(bind_list, id_priv);
3344                         if (!ret)
3345                                 cma_bind_port(bind_list, id_priv);
3346                 }
3347                 /*
3348                  * Remember previously used port number in order to avoid
3349                  * re-using same port immediately after it is closed.
3350                  */
3351                 if (!ret)
3352                         last_used_port = rover;
3353                 if (ret != -EADDRNOTAVAIL)
3354                         return ret;
3355         }
3356         if (--remaining) {
3357                 rover++;
3358                 if ((rover < low) || (rover > high))
3359                         rover = low;
3360                 goto retry;
3361         }
3362         return -EADDRNOTAVAIL;
3363 }
3364
3365 /*
3366  * Check that the requested port is available.  This is called when trying to
3367  * bind to a specific port, or when trying to listen on a bound port.  In
3368  * the latter case, the provided id_priv may already be on the bind_list, but
3369  * we still need to check that it's okay to start listening.
3370  */
3371 static int cma_check_port(struct rdma_bind_list *bind_list,
3372                           struct rdma_id_private *id_priv, uint8_t reuseaddr)
3373 {
3374         struct rdma_id_private *cur_id;
3375         struct sockaddr *addr, *cur_addr;
3376
3377         addr = cma_src_addr(id_priv);
3378         hlist_for_each_entry(cur_id, &bind_list->owners, node) {
3379                 if (id_priv == cur_id)
3380                         continue;
3381
3382                 if ((cur_id->state != RDMA_CM_LISTEN) && reuseaddr &&
3383                     cur_id->reuseaddr)
3384                         continue;
3385
3386                 cur_addr = cma_src_addr(cur_id);
3387                 if (id_priv->afonly && cur_id->afonly &&
3388                     (addr->sa_family != cur_addr->sa_family))
3389                         continue;
3390
3391                 if (cma_any_addr(addr) || cma_any_addr(cur_addr))
3392                         return -EADDRNOTAVAIL;
3393
3394                 if (!cma_addr_cmp(addr, cur_addr))
3395                         return -EADDRINUSE;
3396         }
3397         return 0;
3398 }
3399
3400 static int cma_use_port(enum rdma_ucm_port_space ps,
3401                         struct rdma_id_private *id_priv)
3402 {
3403         struct rdma_bind_list *bind_list;
3404         unsigned short snum;
3405         int ret;
3406
3407         snum = ntohs(cma_port(cma_src_addr(id_priv)));
3408         if (snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
3409                 return -EACCES;
3410
3411         bind_list = cma_ps_find(id_priv->id.route.addr.dev_addr.net, ps, snum);
3412         if (!bind_list) {
3413                 ret = cma_alloc_port(ps, id_priv, snum);
3414         } else {
3415                 ret = cma_check_port(bind_list, id_priv, id_priv->reuseaddr);
3416                 if (!ret)
3417                         cma_bind_port(bind_list, id_priv);
3418         }
3419         return ret;
3420 }
3421
3422 static int cma_bind_listen(struct rdma_id_private *id_priv)
3423 {
3424         struct rdma_bind_list *bind_list = id_priv->bind_list;
3425         int ret = 0;
3426
3427         mutex_lock(&lock);
3428         if (bind_list->owners.first->next)
3429                 ret = cma_check_port(bind_list, id_priv, 0);
3430         mutex_unlock(&lock);
3431         return ret;
3432 }
3433
3434 static enum rdma_ucm_port_space
3435 cma_select_inet_ps(struct rdma_id_private *id_priv)
3436 {
3437         switch (id_priv->id.ps) {
3438         case RDMA_PS_TCP:
3439         case RDMA_PS_UDP:
3440         case RDMA_PS_IPOIB:
3441         case RDMA_PS_IB:
3442                 return id_priv->id.ps;
3443         default:
3444
3445                 return 0;
3446         }
3447 }
3448
3449 static enum rdma_ucm_port_space
3450 cma_select_ib_ps(struct rdma_id_private *id_priv)
3451 {
3452         enum rdma_ucm_port_space ps = 0;
3453         struct sockaddr_ib *sib;
3454         u64 sid_ps, mask, sid;
3455
3456         sib = (struct sockaddr_ib *) cma_src_addr(id_priv);
3457         mask = be64_to_cpu(sib->sib_sid_mask) & RDMA_IB_IP_PS_MASK;
3458         sid = be64_to_cpu(sib->sib_sid) & mask;
3459
3460         if ((id_priv->id.ps == RDMA_PS_IB) && (sid == (RDMA_IB_IP_PS_IB & mask))) {
3461                 sid_ps = RDMA_IB_IP_PS_IB;
3462                 ps = RDMA_PS_IB;
3463         } else if (((id_priv->id.ps == RDMA_PS_IB) || (id_priv->id.ps == RDMA_PS_TCP)) &&
3464                    (sid == (RDMA_IB_IP_PS_TCP & mask))) {
3465                 sid_ps = RDMA_IB_IP_PS_TCP;
3466                 ps = RDMA_PS_TCP;
3467         } else if (((id_priv->id.ps == RDMA_PS_IB) || (id_priv->id.ps == RDMA_PS_UDP)) &&
3468                    (sid == (RDMA_IB_IP_PS_UDP & mask))) {
3469                 sid_ps = RDMA_IB_IP_PS_UDP;
3470                 ps = RDMA_PS_UDP;
3471         }
3472
3473         if (ps) {
3474                 sib->sib_sid = cpu_to_be64(sid_ps | ntohs(cma_port((struct sockaddr *) sib)));
3475                 sib->sib_sid_mask = cpu_to_be64(RDMA_IB_IP_PS_MASK |
3476                                                 be64_to_cpu(sib->sib_sid_mask));
3477         }
3478         return ps;
3479 }
3480
3481 static int cma_get_port(struct rdma_id_private *id_priv)
3482 {
3483         enum rdma_ucm_port_space ps;
3484         int ret;
3485
3486         if (cma_family(id_priv) != AF_IB)
3487                 ps = cma_select_inet_ps(id_priv);
3488         else
3489                 ps = cma_select_ib_ps(id_priv);
3490         if (!ps)
3491                 return -EPROTONOSUPPORT;
3492
3493         mutex_lock(&lock);
3494         if (cma_any_port(cma_src_addr(id_priv)))
3495                 ret = cma_alloc_any_port(ps, id_priv);
3496         else
3497                 ret = cma_use_port(ps, id_priv);
3498         mutex_unlock(&lock);
3499
3500         return ret;
3501 }
3502
3503 static int cma_check_linklocal(struct rdma_dev_addr *dev_addr,
3504                                struct sockaddr *addr)
3505 {
3506 #if IS_ENABLED(CONFIG_IPV6)
3507         struct sockaddr_in6 *sin6;
3508
3509         if (addr->sa_family != AF_INET6)
3510                 return 0;
3511
3512         sin6 = (struct sockaddr_in6 *) addr;
3513
3514         if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
3515                 return 0;
3516
3517         if (!sin6->sin6_scope_id)
3518                         return -EINVAL;
3519
3520         dev_addr->bound_dev_if = sin6->sin6_scope_id;
3521 #endif
3522         return 0;
3523 }
3524
3525 int rdma_listen(struct rdma_cm_id *id, int backlog)
3526 {
3527         struct rdma_id_private *id_priv;
3528         int ret;
3529
3530         id_priv = container_of(id, struct rdma_id_private, id);
3531         if (id_priv->state == RDMA_CM_IDLE) {
3532                 id->route.addr.src_addr.ss_family = AF_INET;
3533                 ret = rdma_bind_addr(id, cma_src_addr(id_priv));
3534                 if (ret)
3535                         return ret;
3536         }
3537
3538         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_LISTEN))
3539                 return -EINVAL;
3540
3541         if (id_priv->reuseaddr) {
3542                 ret = cma_bind_listen(id_priv);
3543                 if (ret)
3544                         goto err;
3545         }
3546
3547         id_priv->backlog = backlog;
3548         if (id->device) {
3549                 if (rdma_cap_ib_cm(id->device, 1)) {
3550                         ret = cma_ib_listen(id_priv);
3551                         if (ret)
3552                                 goto err;
3553                 } else if (rdma_cap_iw_cm(id->device, 1)) {
3554                         ret = cma_iw_listen(id_priv, backlog);
3555                         if (ret)
3556                                 goto err;
3557                 } else {
3558                         ret = -ENOSYS;
3559                         goto err;
3560                 }
3561         } else
3562                 cma_listen_on_all(id_priv);
3563
3564         return 0;
3565 err:
3566         id_priv->backlog = 0;
3567         cma_comp_exch(id_priv, RDMA_CM_LISTEN, RDMA_CM_ADDR_BOUND);
3568         return ret;
3569 }
3570 EXPORT_SYMBOL(rdma_listen);
3571
3572 int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr)
3573 {
3574         struct rdma_id_private *id_priv;
3575         int ret;
3576         struct sockaddr  *daddr;
3577
3578         if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6 &&
3579             addr->sa_family != AF_IB)
3580                 return -EAFNOSUPPORT;
3581
3582         id_priv = container_of(id, struct rdma_id_private, id);
3583         if (!cma_comp_exch(id_priv, RDMA_CM_IDLE, RDMA_CM_ADDR_BOUND))
3584                 return -EINVAL;
3585
3586         ret = cma_check_linklocal(&id->route.addr.dev_addr, addr);
3587         if (ret)
3588                 goto err1;
3589
3590         memcpy(cma_src_addr(id_priv), addr, rdma_addr_size(addr));
3591         if (!cma_any_addr(addr)) {
3592                 ret = cma_translate_addr(addr, &id->route.addr.dev_addr);
3593                 if (ret)
3594                         goto err1;
3595
3596                 ret = cma_acquire_dev_by_src_ip(id_priv);
3597                 if (ret)
3598                         goto err1;
3599         }
3600
3601         if (!(id_priv->options & (1 << CMA_OPTION_AFONLY))) {
3602                 if (addr->sa_family == AF_INET)
3603                         id_priv->afonly = 1;
3604 #if IS_ENABLED(CONFIG_IPV6)
3605                 else if (addr->sa_family == AF_INET6) {
3606                         struct net *net = id_priv->id.route.addr.dev_addr.net;
3607
3608                         id_priv->afonly = net->ipv6.sysctl.bindv6only;
3609                 }
3610 #endif
3611         }
3612         daddr = cma_dst_addr(id_priv);
3613         daddr->sa_family = addr->sa_family;
3614
3615         ret = cma_get_port(id_priv);
3616         if (ret)
3617                 goto err2;
3618
3619         return 0;
3620 err2:
3621         rdma_restrack_del(&id_priv->res);
3622         if (id_priv->cma_dev)
3623                 cma_release_dev(id_priv);
3624 err1:
3625         cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_IDLE);
3626         return ret;
3627 }
3628 EXPORT_SYMBOL(rdma_bind_addr);
3629
3630 static int cma_format_hdr(void *hdr, struct rdma_id_private *id_priv)
3631 {
3632         struct cma_hdr *cma_hdr;
3633
3634         cma_hdr = hdr;
3635         cma_hdr->cma_version = CMA_VERSION;
3636         if (cma_family(id_priv) == AF_INET) {
3637                 struct sockaddr_in *src4, *dst4;
3638
3639                 src4 = (struct sockaddr_in *) cma_src_addr(id_priv);
3640                 dst4 = (struct sockaddr_in *) cma_dst_addr(id_priv);
3641
3642                 cma_set_ip_ver(cma_hdr, 4);
3643                 cma_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
3644                 cma_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
3645                 cma_hdr->port = src4->sin_port;
3646         } else if (cma_family(id_priv) == AF_INET6) {
3647                 struct sockaddr_in6 *src6, *dst6;
3648
3649                 src6 = (struct sockaddr_in6 *) cma_src_addr(id_priv);
3650                 dst6 = (struct sockaddr_in6 *) cma_dst_addr(id_priv);
3651
3652                 cma_set_ip_ver(cma_hdr, 6);
3653                 cma_hdr->src_addr.ip6 = src6->sin6_addr;
3654                 cma_hdr->dst_addr.ip6 = dst6->sin6_addr;
3655                 cma_hdr->port = src6->sin6_port;
3656         }
3657         return 0;
3658 }
3659
3660 static int cma_sidr_rep_handler(struct ib_cm_id *cm_id,
3661                                 const struct ib_cm_event *ib_event)
3662 {
3663         struct rdma_id_private *id_priv = cm_id->context;
3664         struct rdma_cm_event event = {};
3665         const struct ib_cm_sidr_rep_event_param *rep =
3666                                 &ib_event->param.sidr_rep_rcvd;
3667         int ret = 0;
3668
3669         mutex_lock(&id_priv->handler_mutex);
3670         if (id_priv->state != RDMA_CM_CONNECT)
3671                 goto out;
3672
3673         switch (ib_event->event) {
3674         case IB_CM_SIDR_REQ_ERROR:
3675                 event.event = RDMA_CM_EVENT_UNREACHABLE;
3676                 event.status = -ETIMEDOUT;
3677                 break;
3678         case IB_CM_SIDR_REP_RECEIVED:
3679                 event.param.ud.private_data = ib_event->private_data;
3680                 event.param.ud.private_data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
3681                 if (rep->status != IB_SIDR_SUCCESS) {
3682                         event.event = RDMA_CM_EVENT_UNREACHABLE;
3683                         event.status = ib_event->param.sidr_rep_rcvd.status;
3684                         pr_debug_ratelimited("RDMA CM: UNREACHABLE: bad SIDR reply. status %d\n",
3685                                              event.status);
3686                         break;
3687                 }
3688                 ret = cma_set_qkey(id_priv, rep->qkey);
3689                 if (ret) {
3690                         pr_debug_ratelimited("RDMA CM: ADDR_ERROR: failed to set qkey. status %d\n", ret);
3691                         event.event = RDMA_CM_EVENT_ADDR_ERROR;
3692                         event.status = ret;
3693                         break;
3694                 }
3695                 ib_init_ah_attr_from_path(id_priv->id.device,
3696                                           id_priv->id.port_num,
3697                                           id_priv->id.route.path_rec,
3698                                           &event.param.ud.ah_attr,
3699                                           rep->sgid_attr);
3700                 event.param.ud.qp_num = rep->qpn;
3701                 event.param.ud.qkey = rep->qkey;
3702                 event.event = RDMA_CM_EVENT_ESTABLISHED;
3703                 event.status = 0;
3704                 break;
3705         default:
3706                 pr_err("RDMA CMA: unexpected IB CM event: %d\n",
3707                        ib_event->event);
3708                 goto out;
3709         }
3710
3711         ret = id_priv->id.event_handler(&id_priv->id, &event);
3712
3713         rdma_destroy_ah_attr(&event.param.ud.ah_attr);
3714         if (ret) {
3715                 /* Destroy the CM ID by returning a non-zero value. */
3716                 id_priv->cm_id.ib = NULL;
3717                 cma_exch(id_priv, RDMA_CM_DESTROYING);
3718                 mutex_unlock(&id_priv->handler_mutex);
3719                 rdma_destroy_id(&id_priv->id);
3720                 return ret;
3721         }
3722 out:
3723         mutex_unlock(&id_priv->handler_mutex);
3724         return ret;
3725 }
3726
3727 static int cma_resolve_ib_udp(struct rdma_id_private *id_priv,
3728                               struct rdma_conn_param *conn_param)
3729 {
3730         struct ib_cm_sidr_req_param req;
3731         struct ib_cm_id *id;
3732         void *private_data;
3733         u8 offset;
3734         int ret;
3735
3736         memset(&req, 0, sizeof req);
3737         offset = cma_user_data_offset(id_priv);
3738         req.private_data_len = offset + conn_param->private_data_len;
3739         if (req.private_data_len < conn_param->private_data_len)
3740                 return -EINVAL;
3741
3742         if (req.private_data_len) {
3743                 private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
3744                 if (!private_data)
3745                         return -ENOMEM;
3746         } else {
3747                 private_data = NULL;
3748         }
3749
3750         if (conn_param->private_data && conn_param->private_data_len)
3751                 memcpy(private_data + offset, conn_param->private_data,
3752                        conn_param->private_data_len);
3753
3754         if (private_data) {
3755                 ret = cma_format_hdr(private_data, id_priv);
3756                 if (ret)
3757                         goto out;
3758                 req.private_data = private_data;
3759         }
3760
3761         id = ib_create_cm_id(id_priv->id.device, cma_sidr_rep_handler,
3762                              id_priv);
3763         if (IS_ERR(id)) {
3764                 ret = PTR_ERR(id);
3765                 goto out;
3766         }
3767         id_priv->cm_id.ib = id;
3768
3769         req.path = id_priv->id.route.path_rec;
3770         req.sgid_attr = id_priv->id.route.addr.dev_addr.sgid_attr;
3771         req.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
3772         req.timeout_ms = 1 << (CMA_CM_RESPONSE_TIMEOUT - 8);
3773         req.max_cm_retries = CMA_MAX_CM_RETRIES;
3774
3775         ret = ib_send_cm_sidr_req(id_priv->cm_id.ib, &req);
3776         if (ret) {
3777                 ib_destroy_cm_id(id_priv->cm_id.ib);
3778                 id_priv->cm_id.ib = NULL;
3779         }
3780 out:
3781         kfree(private_data);
3782         return ret;
3783 }
3784
3785 static int cma_connect_ib(struct rdma_id_private *id_priv,
3786                           struct rdma_conn_param *conn_param)
3787 {
3788         struct ib_cm_req_param req;
3789         struct rdma_route *route;
3790         void *private_data;
3791         struct ib_cm_id *id;
3792         u8 offset;
3793         int ret;
3794
3795         memset(&req, 0, sizeof req);
3796         offset = cma_user_data_offset(id_priv);
3797         req.private_data_len = offset + conn_param->private_data_len;
3798         if (req.private_data_len < conn_param->private_data_len)
3799                 return -EINVAL;
3800
3801         if (req.private_data_len) {
3802                 private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
3803                 if (!private_data)
3804                         return -ENOMEM;
3805         } else {
3806                 private_data = NULL;
3807         }
3808
3809         if (conn_param->private_data && conn_param->private_data_len)
3810                 memcpy(private_data + offset, conn_param->private_data,
3811                        conn_param->private_data_len);
3812
3813         id = ib_create_cm_id(id_priv->id.device, cma_ib_handler, id_priv);
3814         if (IS_ERR(id)) {
3815                 ret = PTR_ERR(id);
3816                 goto out;
3817         }
3818         id_priv->cm_id.ib = id;
3819
3820         route = &id_priv->id.route;
3821         if (private_data) {
3822                 ret = cma_format_hdr(private_data, id_priv);
3823                 if (ret)
3824                         goto out;
3825                 req.private_data = private_data;
3826         }
3827
3828         req.primary_path = &route->path_rec[0];
3829         if (route->num_paths == 2)
3830                 req.alternate_path = &route->path_rec[1];
3831
3832         req.ppath_sgid_attr = id_priv->id.route.addr.dev_addr.sgid_attr;
3833         /* Alternate path SGID attribute currently unsupported */
3834         req.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
3835         req.qp_num = id_priv->qp_num;
3836         req.qp_type = id_priv->id.qp_type;
3837         req.starting_psn = id_priv->seq_num;
3838         req.responder_resources = conn_param->responder_resources;
3839         req.initiator_depth = conn_param->initiator_depth;
3840         req.flow_control = conn_param->flow_control;
3841         req.retry_count = min_t(u8, 7, conn_param->retry_count);
3842         req.rnr_retry_count = min_t(u8, 7, conn_param->rnr_retry_count);
3843         req.remote_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
3844         req.local_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
3845         req.max_cm_retries = CMA_MAX_CM_RETRIES;
3846         req.srq = id_priv->srq ? 1 : 0;
3847
3848         ret = ib_send_cm_req(id_priv->cm_id.ib, &req);
3849 out:
3850         if (ret && !IS_ERR(id)) {
3851                 ib_destroy_cm_id(id);
3852                 id_priv->cm_id.ib = NULL;
3853         }
3854
3855         kfree(private_data);
3856         return ret;
3857 }
3858
3859 static int cma_connect_iw(struct rdma_id_private *id_priv,
3860                           struct rdma_conn_param *conn_param)
3861 {
3862         struct iw_cm_id *cm_id;
3863         int ret;
3864         struct iw_cm_conn_param iw_param;
3865
3866         cm_id = iw_create_cm_id(id_priv->id.device, cma_iw_handler, id_priv);
3867         if (IS_ERR(cm_id))
3868                 return PTR_ERR(cm_id);
3869
3870         cm_id->tos = id_priv->tos;
3871         cm_id->tos_set = id_priv->tos_set;
3872         id_priv->cm_id.iw = cm_id;
3873
3874         memcpy(&cm_id->local_addr, cma_src_addr(id_priv),
3875                rdma_addr_size(cma_src_addr(id_priv)));
3876         memcpy(&cm_id->remote_addr, cma_dst_addr(id_priv),
3877                rdma_addr_size(cma_dst_addr(id_priv)));
3878
3879         ret = cma_modify_qp_rtr(id_priv, conn_param);
3880         if (ret)
3881                 goto out;
3882
3883         if (conn_param) {
3884                 iw_param.ord = conn_param->initiator_depth;
3885                 iw_param.ird = conn_param->responder_resources;
3886                 iw_param.private_data = conn_param->private_data;
3887                 iw_param.private_data_len = conn_param->private_data_len;
3888                 iw_param.qpn = id_priv->id.qp ? id_priv->qp_num : conn_param->qp_num;
3889         } else {
3890                 memset(&iw_param, 0, sizeof iw_param);
3891                 iw_param.qpn = id_priv->qp_num;
3892         }
3893         ret = iw_cm_connect(cm_id, &iw_param);
3894 out:
3895         if (ret) {
3896                 iw_destroy_cm_id(cm_id);
3897                 id_priv->cm_id.iw = NULL;
3898         }
3899         return ret;
3900 }
3901
3902 int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
3903 {
3904         struct rdma_id_private *id_priv;
3905         int ret;
3906
3907         id_priv = container_of(id, struct rdma_id_private, id);
3908         if (!cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_CONNECT))
3909                 return -EINVAL;
3910
3911         if (!id->qp) {
3912                 id_priv->qp_num = conn_param->qp_num;
3913                 id_priv->srq = conn_param->srq;
3914         }
3915
3916         if (rdma_cap_ib_cm(id->device, id->port_num)) {
3917                 if (id->qp_type == IB_QPT_UD)
3918                         ret = cma_resolve_ib_udp(id_priv, conn_param);
3919                 else
3920                         ret = cma_connect_ib(id_priv, conn_param);
3921         } else if (rdma_cap_iw_cm(id->device, id->port_num))
3922                 ret = cma_connect_iw(id_priv, conn_param);
3923         else
3924                 ret = -ENOSYS;
3925         if (ret)
3926                 goto err;
3927
3928         return 0;
3929 err:
3930         cma_comp_exch(id_priv, RDMA_CM_CONNECT, RDMA_CM_ROUTE_RESOLVED);
3931         return ret;
3932 }
3933 EXPORT_SYMBOL(rdma_connect);
3934
3935 static int cma_accept_ib(struct rdma_id_private *id_priv,
3936                          struct rdma_conn_param *conn_param)
3937 {
3938         struct ib_cm_rep_param rep;
3939         int ret;
3940
3941         ret = cma_modify_qp_rtr(id_priv, conn_param);
3942         if (ret)
3943                 goto out;
3944
3945         ret = cma_modify_qp_rts(id_priv, conn_param);
3946         if (ret)
3947                 goto out;
3948
3949         memset(&rep, 0, sizeof rep);
3950         rep.qp_num = id_priv->qp_num;
3951         rep.starting_psn = id_priv->seq_num;
3952         rep.private_data = conn_param->private_data;
3953         rep.private_data_len = conn_param->private_data_len;
3954         rep.responder_resources = conn_param->responder_resources;
3955         rep.initiator_depth = conn_param->initiator_depth;
3956         rep.failover_accepted = 0;
3957         rep.flow_control = conn_param->flow_control;
3958         rep.rnr_retry_count = min_t(u8, 7, conn_param->rnr_retry_count);
3959         rep.srq = id_priv->srq ? 1 : 0;
3960
3961         ret = ib_send_cm_rep(id_priv->cm_id.ib, &rep);
3962 out:
3963         return ret;
3964 }
3965
3966 static int cma_accept_iw(struct rdma_id_private *id_priv,
3967                   struct rdma_conn_param *conn_param)
3968 {
3969         struct iw_cm_conn_param iw_param;
3970         int ret;
3971
3972         if (!conn_param)
3973                 return -EINVAL;
3974
3975         ret = cma_modify_qp_rtr(id_priv, conn_param);
3976         if (ret)
3977                 return ret;
3978
3979         iw_param.ord = conn_param->initiator_depth;
3980         iw_param.ird = conn_param->responder_resources;
3981         iw_param.private_data = conn_param->private_data;
3982         iw_param.private_data_len = conn_param->private_data_len;
3983         if (id_priv->id.qp) {
3984                 iw_param.qpn = id_priv->qp_num;
3985         } else
3986                 iw_param.qpn = conn_param->qp_num;
3987
3988         return iw_cm_accept(id_priv->cm_id.iw, &iw_param);
3989 }
3990
3991 static int cma_send_sidr_rep(struct rdma_id_private *id_priv,
3992                              enum ib_cm_sidr_status status, u32 qkey,
3993                              const void *private_data, int private_data_len)
3994 {
3995         struct ib_cm_sidr_rep_param rep;
3996         int ret;
3997
3998         memset(&rep, 0, sizeof rep);
3999         rep.status = status;
4000         if (status == IB_SIDR_SUCCESS) {
4001                 ret = cma_set_qkey(id_priv, qkey);
4002                 if (ret)
4003                         return ret;
4004                 rep.qp_num = id_priv->qp_num;
4005                 rep.qkey = id_priv->qkey;
4006         }
4007         rep.private_data = private_data;
4008         rep.private_data_len = private_data_len;
4009
4010         return ib_send_cm_sidr_rep(id_priv->cm_id.ib, &rep);
4011 }
4012
4013 int __rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param,
4014                   const char *caller)
4015 {
4016         struct rdma_id_private *id_priv;
4017         int ret;
4018
4019         id_priv = container_of(id, struct rdma_id_private, id);
4020
4021         rdma_restrack_set_task(&id_priv->res, caller);
4022
4023         if (!cma_comp(id_priv, RDMA_CM_CONNECT))
4024                 return -EINVAL;
4025
4026         if (!id->qp && conn_param) {
4027                 id_priv->qp_num = conn_param->qp_num;
4028                 id_priv->srq = conn_param->srq;
4029         }
4030
4031         if (rdma_cap_ib_cm(id->device, id->port_num)) {
4032                 if (id->qp_type == IB_QPT_UD) {
4033                         if (conn_param)
4034                                 ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
4035                                                         conn_param->qkey,
4036                                                         conn_param->private_data,
4037                                                         conn_param->private_data_len);
4038                         else
4039                                 ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
4040                                                         0, NULL, 0);
4041                 } else {
4042                         if (conn_param)
4043                                 ret = cma_accept_ib(id_priv, conn_param);
4044                         else
4045                                 ret = cma_rep_recv(id_priv);
4046                 }
4047         } else if (rdma_cap_iw_cm(id->device, id->port_num))
4048                 ret = cma_accept_iw(id_priv, conn_param);
4049         else
4050                 ret = -ENOSYS;
4051
4052         if (ret)
4053                 goto reject;
4054
4055         return 0;
4056 reject:
4057         cma_modify_qp_err(id_priv);
4058         rdma_reject(id, NULL, 0);
4059         return ret;
4060 }
4061 EXPORT_SYMBOL(__rdma_accept);
4062
4063 int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event)
4064 {
4065         struct rdma_id_private *id_priv;
4066         int ret;
4067
4068         id_priv = container_of(id, struct rdma_id_private, id);
4069         if (!id_priv->cm_id.ib)
4070                 return -EINVAL;
4071
4072         switch (id->device->node_type) {
4073         case RDMA_NODE_IB_CA:
4074                 ret = ib_cm_notify(id_priv->cm_id.ib, event);
4075                 break;
4076         default:
4077                 ret = 0;
4078                 break;
4079         }
4080         return ret;
4081 }
4082 EXPORT_SYMBOL(rdma_notify);
4083
4084 int rdma_reject(struct rdma_cm_id *id, const void *private_data,
4085                 u8 private_data_len)
4086 {
4087         struct rdma_id_private *id_priv;
4088         int ret;
4089
4090         id_priv = container_of(id, struct rdma_id_private, id);
4091         if (!id_priv->cm_id.ib)
4092                 return -EINVAL;
4093
4094         if (rdma_cap_ib_cm(id->device, id->port_num)) {
4095                 if (id->qp_type == IB_QPT_UD)
4096                         ret = cma_send_sidr_rep(id_priv, IB_SIDR_REJECT, 0,
4097                                                 private_data, private_data_len);
4098                 else
4099                         ret = ib_send_cm_rej(id_priv->cm_id.ib,
4100                                              IB_CM_REJ_CONSUMER_DEFINED, NULL,
4101                                              0, private_data, private_data_len);
4102         } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
4103                 ret = iw_cm_reject(id_priv->cm_id.iw,
4104                                    private_data, private_data_len);
4105         } else
4106                 ret = -ENOSYS;
4107
4108         return ret;
4109 }
4110 EXPORT_SYMBOL(rdma_reject);
4111
4112 int rdma_disconnect(struct rdma_cm_id *id)
4113 {
4114         struct rdma_id_private *id_priv;
4115         int ret;
4116
4117         id_priv = container_of(id, struct rdma_id_private, id);
4118         if (!id_priv->cm_id.ib)
4119                 return -EINVAL;
4120
4121         if (rdma_cap_ib_cm(id->device, id->port_num)) {
4122                 ret = cma_modify_qp_err(id_priv);
4123                 if (ret)
4124                         goto out;
4125                 /* Initiate or respond to a disconnect. */
4126                 if (ib_send_cm_dreq(id_priv->cm_id.ib, NULL, 0))
4127                         ib_send_cm_drep(id_priv->cm_id.ib, NULL, 0);
4128         } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
4129                 ret = iw_cm_disconnect(id_priv->cm_id.iw, 0);
4130         } else
4131                 ret = -EINVAL;
4132
4133 out:
4134         return ret;
4135 }
4136 EXPORT_SYMBOL(rdma_disconnect);
4137
4138 static int cma_ib_mc_handler(int status, struct ib_sa_multicast *multicast)
4139 {
4140         struct rdma_id_private *id_priv;
4141         struct cma_multicast *mc = multicast->context;
4142         struct rdma_cm_event event = {};
4143         int ret = 0;
4144
4145         id_priv = mc->id_priv;
4146         mutex_lock(&id_priv->handler_mutex);
4147         if (id_priv->state != RDMA_CM_ADDR_BOUND &&
4148             id_priv->state != RDMA_CM_ADDR_RESOLVED)
4149                 goto out;
4150
4151         if (!status)
4152                 status = cma_set_qkey(id_priv, be32_to_cpu(multicast->rec.qkey));
4153         else
4154                 pr_debug_ratelimited("RDMA CM: MULTICAST_ERROR: failed to join multicast. status %d\n",
4155                                      status);
4156         mutex_lock(&id_priv->qp_mutex);
4157         if (!status && id_priv->id.qp) {
4158                 status = ib_attach_mcast(id_priv->id.qp, &multicast->rec.mgid,
4159                                          be16_to_cpu(multicast->rec.mlid));
4160                 if (status)
4161                         pr_debug_ratelimited("RDMA CM: MULTICAST_ERROR: failed to attach QP. status %d\n",
4162                                              status);
4163         }
4164         mutex_unlock(&id_priv->qp_mutex);
4165
4166         event.status = status;
4167         event.param.ud.private_data = mc->context;
4168         if (!status) {
4169                 struct rdma_dev_addr *dev_addr =
4170                         &id_priv->id.route.addr.dev_addr;
4171                 struct net_device *ndev =
4172                         dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if);
4173                 enum ib_gid_type gid_type =
4174                         id_priv->cma_dev->default_gid_type[id_priv->id.port_num -
4175                         rdma_start_port(id_priv->cma_dev->device)];
4176
4177                 event.event = RDMA_CM_EVENT_MULTICAST_JOIN;
4178                 ret = ib_init_ah_from_mcmember(id_priv->id.device,
4179                                                id_priv->id.port_num,
4180                                                &multicast->rec,
4181                                                ndev, gid_type,
4182                                                &event.param.ud.ah_attr);
4183                 if (ret)
4184                         event.event = RDMA_CM_EVENT_MULTICAST_ERROR;
4185
4186                 event.param.ud.qp_num = 0xFFFFFF;
4187                 event.param.ud.qkey = be32_to_cpu(multicast->rec.qkey);
4188                 if (ndev)
4189                         dev_put(ndev);
4190         } else
4191                 event.event = RDMA_CM_EVENT_MULTICAST_ERROR;
4192
4193         ret = id_priv->id.event_handler(&id_priv->id, &event);
4194
4195         rdma_destroy_ah_attr(&event.param.ud.ah_attr);
4196         if (ret) {
4197                 cma_exch(id_priv, RDMA_CM_DESTROYING);
4198                 mutex_unlock(&id_priv->handler_mutex);
4199                 rdma_destroy_id(&id_priv->id);
4200                 return 0;
4201         }
4202
4203 out:
4204         mutex_unlock(&id_priv->handler_mutex);
4205         return 0;
4206 }
4207
4208 static void cma_set_mgid(struct rdma_id_private *id_priv,
4209                          struct sockaddr *addr, union ib_gid *mgid)
4210 {
4211         unsigned char mc_map[MAX_ADDR_LEN];
4212         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
4213         struct sockaddr_in *sin = (struct sockaddr_in *) addr;
4214         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) addr;
4215
4216         if (cma_any_addr(addr)) {
4217                 memset(mgid, 0, sizeof *mgid);
4218         } else if ((addr->sa_family == AF_INET6) &&
4219                    ((be32_to_cpu(sin6->sin6_addr.s6_addr32[0]) & 0xFFF0FFFF) ==
4220                                                                  0xFF10A01B)) {
4221                 /* IPv6 address is an SA assigned MGID. */
4222                 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
4223         } else if (addr->sa_family == AF_IB) {
4224                 memcpy(mgid, &((struct sockaddr_ib *) addr)->sib_addr, sizeof *mgid);
4225         } else if (addr->sa_family == AF_INET6) {
4226                 ipv6_ib_mc_map(&sin6->sin6_addr, dev_addr->broadcast, mc_map);
4227                 if (id_priv->id.ps == RDMA_PS_UDP)
4228                         mc_map[7] = 0x01;       /* Use RDMA CM signature */
4229                 *mgid = *(union ib_gid *) (mc_map + 4);
4230         } else {
4231                 ip_ib_mc_map(sin->sin_addr.s_addr, dev_addr->broadcast, mc_map);
4232                 if (id_priv->id.ps == RDMA_PS_UDP)
4233                         mc_map[7] = 0x01;       /* Use RDMA CM signature */
4234                 *mgid = *(union ib_gid *) (mc_map + 4);
4235         }
4236 }
4237
4238 static int cma_join_ib_multicast(struct rdma_id_private *id_priv,
4239                                  struct cma_multicast *mc)
4240 {
4241         struct ib_sa_mcmember_rec rec;
4242         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
4243         ib_sa_comp_mask comp_mask;
4244         int ret;
4245
4246         ib_addr_get_mgid(dev_addr, &rec.mgid);
4247         ret = ib_sa_get_mcmember_rec(id_priv->id.device, id_priv->id.port_num,
4248                                      &rec.mgid, &rec);
4249         if (ret)
4250                 return ret;
4251
4252         ret = cma_set_qkey(id_priv, 0);
4253         if (ret)
4254                 return ret;
4255
4256         cma_set_mgid(id_priv, (struct sockaddr *) &mc->addr, &rec.mgid);
4257         rec.qkey = cpu_to_be32(id_priv->qkey);
4258         rdma_addr_get_sgid(dev_addr, &rec.port_gid);
4259         rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
4260         rec.join_state = mc->join_state;
4261
4262         if ((rec.join_state == BIT(SENDONLY_FULLMEMBER_JOIN)) &&
4263             (!ib_sa_sendonly_fullmem_support(&sa_client,
4264                                              id_priv->id.device,
4265                                              id_priv->id.port_num))) {
4266                 dev_warn(
4267                         &id_priv->id.device->dev,
4268                         "RDMA CM: port %u Unable to multicast join: SM doesn't support Send Only Full Member option\n",
4269                         id_priv->id.port_num);
4270                 return -EOPNOTSUPP;
4271         }
4272
4273         comp_mask = IB_SA_MCMEMBER_REC_MGID | IB_SA_MCMEMBER_REC_PORT_GID |
4274                     IB_SA_MCMEMBER_REC_PKEY | IB_SA_MCMEMBER_REC_JOIN_STATE |
4275                     IB_SA_MCMEMBER_REC_QKEY | IB_SA_MCMEMBER_REC_SL |
4276                     IB_SA_MCMEMBER_REC_FLOW_LABEL |
4277                     IB_SA_MCMEMBER_REC_TRAFFIC_CLASS;
4278
4279         if (id_priv->id.ps == RDMA_PS_IPOIB)
4280                 comp_mask |= IB_SA_MCMEMBER_REC_RATE |
4281                              IB_SA_MCMEMBER_REC_RATE_SELECTOR |
4282                              IB_SA_MCMEMBER_REC_MTU_SELECTOR |
4283                              IB_SA_MCMEMBER_REC_MTU |
4284                              IB_SA_MCMEMBER_REC_HOP_LIMIT;
4285
4286         mc->multicast.ib = ib_sa_join_multicast(&sa_client, id_priv->id.device,
4287                                                 id_priv->id.port_num, &rec,
4288                                                 comp_mask, GFP_KERNEL,
4289                                                 cma_ib_mc_handler, mc);
4290         return PTR_ERR_OR_ZERO(mc->multicast.ib);
4291 }
4292
4293 static void iboe_mcast_work_handler(struct work_struct *work)
4294 {
4295         struct iboe_mcast_work *mw = container_of(work, struct iboe_mcast_work, work);
4296         struct cma_multicast *mc = mw->mc;
4297         struct ib_sa_multicast *m = mc->multicast.ib;
4298
4299         mc->multicast.ib->context = mc;
4300         cma_ib_mc_handler(0, m);
4301         kref_put(&mc->mcref, release_mc);
4302         kfree(mw);
4303 }
4304
4305 static void cma_iboe_set_mgid(struct sockaddr *addr, union ib_gid *mgid,
4306                               enum ib_gid_type gid_type)
4307 {
4308         struct sockaddr_in *sin = (struct sockaddr_in *)addr;
4309         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr;
4310
4311         if (cma_any_addr(addr)) {
4312                 memset(mgid, 0, sizeof *mgid);
4313         } else if (addr->sa_family == AF_INET6) {
4314                 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
4315         } else {
4316                 mgid->raw[0] =
4317                         (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) ? 0 : 0xff;
4318                 mgid->raw[1] =
4319                         (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) ? 0 : 0x0e;
4320                 mgid->raw[2] = 0;
4321                 mgid->raw[3] = 0;
4322                 mgid->raw[4] = 0;
4323                 mgid->raw[5] = 0;
4324                 mgid->raw[6] = 0;
4325                 mgid->raw[7] = 0;
4326                 mgid->raw[8] = 0;
4327                 mgid->raw[9] = 0;
4328                 mgid->raw[10] = 0xff;
4329                 mgid->raw[11] = 0xff;
4330                 *(__be32 *)(&mgid->raw[12]) = sin->sin_addr.s_addr;
4331         }
4332 }
4333
4334 static int cma_iboe_join_multicast(struct rdma_id_private *id_priv,
4335                                    struct cma_multicast *mc)
4336 {
4337         struct iboe_mcast_work *work;
4338         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
4339         int err = 0;
4340         struct sockaddr *addr = (struct sockaddr *)&mc->addr;
4341         struct net_device *ndev = NULL;
4342         enum ib_gid_type gid_type;
4343         bool send_only;
4344
4345         send_only = mc->join_state == BIT(SENDONLY_FULLMEMBER_JOIN);
4346
4347         if (cma_zero_addr((struct sockaddr *)&mc->addr))
4348                 return -EINVAL;
4349
4350         work = kzalloc(sizeof *work, GFP_KERNEL);
4351         if (!work)
4352                 return -ENOMEM;
4353
4354         mc->multicast.ib = kzalloc(sizeof(struct ib_sa_multicast), GFP_KERNEL);
4355         if (!mc->multicast.ib) {
4356                 err = -ENOMEM;
4357                 goto out1;
4358         }
4359
4360         gid_type = id_priv->cma_dev->default_gid_type[id_priv->id.port_num -
4361                    rdma_start_port(id_priv->cma_dev->device)];
4362         cma_iboe_set_mgid(addr, &mc->multicast.ib->rec.mgid, gid_type);
4363
4364         mc->multicast.ib->rec.pkey = cpu_to_be16(0xffff);
4365         if (id_priv->id.ps == RDMA_PS_UDP)
4366                 mc->multicast.ib->rec.qkey = cpu_to_be32(RDMA_UDP_QKEY);
4367
4368         if (dev_addr->bound_dev_if)
4369                 ndev = dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if);
4370         if (!ndev) {
4371                 err = -ENODEV;
4372                 goto out2;
4373         }
4374         mc->multicast.ib->rec.rate = iboe_get_rate(ndev);
4375         mc->multicast.ib->rec.hop_limit = 1;
4376         mc->multicast.ib->rec.mtu = iboe_get_mtu(ndev->mtu);
4377
4378         if (addr->sa_family == AF_INET) {
4379                 if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) {
4380                         mc->multicast.ib->rec.hop_limit = IPV6_DEFAULT_HOPLIMIT;
4381                         if (!send_only) {
4382                                 err = cma_igmp_send(ndev, &mc->multicast.ib->rec.mgid,
4383                                                     true);
4384                         }
4385                 }
4386         } else {
4387                 if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP)
4388                         err = -ENOTSUPP;
4389         }
4390         dev_put(ndev);
4391         if (err || !mc->multicast.ib->rec.mtu) {
4392                 if (!err)
4393                         err = -EINVAL;
4394                 goto out2;
4395         }
4396         rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
4397                     &mc->multicast.ib->rec.port_gid);
4398         work->id = id_priv;
4399         work->mc = mc;
4400         INIT_WORK(&work->work, iboe_mcast_work_handler);
4401         kref_get(&mc->mcref);
4402         queue_work(cma_wq, &work->work);
4403
4404         return 0;
4405
4406 out2:
4407         kfree(mc->multicast.ib);
4408 out1:
4409         kfree(work);
4410         return err;
4411 }
4412
4413 int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
4414                         u8 join_state, void *context)
4415 {
4416         struct rdma_id_private *id_priv;
4417         struct cma_multicast *mc;
4418         int ret;
4419
4420         if (!id->device)
4421                 return -EINVAL;
4422
4423         id_priv = container_of(id, struct rdma_id_private, id);
4424         if (!cma_comp(id_priv, RDMA_CM_ADDR_BOUND) &&
4425             !cma_comp(id_priv, RDMA_CM_ADDR_RESOLVED))
4426                 return -EINVAL;
4427
4428         mc = kmalloc(sizeof *mc, GFP_KERNEL);
4429         if (!mc)
4430                 return -ENOMEM;
4431
4432         memcpy(&mc->addr, addr, rdma_addr_size(addr));
4433         mc->context = context;
4434         mc->id_priv = id_priv;
4435         mc->join_state = join_state;
4436
4437         if (rdma_protocol_roce(id->device, id->port_num)) {
4438                 kref_init(&mc->mcref);
4439                 ret = cma_iboe_join_multicast(id_priv, mc);
4440                 if (ret)
4441                         goto out_err;
4442         } else if (rdma_cap_ib_mcast(id->device, id->port_num)) {
4443                 ret = cma_join_ib_multicast(id_priv, mc);
4444                 if (ret)
4445                         goto out_err;
4446         } else {
4447                 ret = -ENOSYS;
4448                 goto out_err;
4449         }
4450
4451         spin_lock(&id_priv->lock);
4452         list_add(&mc->list, &id_priv->mc_list);
4453         spin_unlock(&id_priv->lock);
4454
4455         return 0;
4456 out_err:
4457         kfree(mc);
4458         return ret;
4459 }
4460 EXPORT_SYMBOL(rdma_join_multicast);
4461
4462 void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr)
4463 {
4464         struct rdma_id_private *id_priv;
4465         struct cma_multicast *mc;
4466
4467         id_priv = container_of(id, struct rdma_id_private, id);
4468         spin_lock_irq(&id_priv->lock);
4469         list_for_each_entry(mc, &id_priv->mc_list, list) {
4470                 if (!memcmp(&mc->addr, addr, rdma_addr_size(addr))) {
4471                         list_del(&mc->list);
4472                         spin_unlock_irq(&id_priv->lock);
4473
4474                         if (id->qp)
4475                                 ib_detach_mcast(id->qp,
4476                                                 &mc->multicast.ib->rec.mgid,
4477                                                 be16_to_cpu(mc->multicast.ib->rec.mlid));
4478
4479                         BUG_ON(id_priv->cma_dev->device != id->device);
4480
4481                         if (rdma_cap_ib_mcast(id->device, id->port_num)) {
4482                                 ib_sa_free_multicast(mc->multicast.ib);
4483                                 kfree(mc);
4484                         } else if (rdma_protocol_roce(id->device, id->port_num)) {
4485                                 cma_leave_roce_mc_group(id_priv, mc);
4486                         }
4487                         return;
4488                 }
4489         }
4490         spin_unlock_irq(&id_priv->lock);
4491 }
4492 EXPORT_SYMBOL(rdma_leave_multicast);
4493
4494 static int cma_netdev_change(struct net_device *ndev, struct rdma_id_private *id_priv)
4495 {
4496         struct rdma_dev_addr *dev_addr;
4497         struct cma_ndev_work *work;
4498
4499         dev_addr = &id_priv->id.route.addr.dev_addr;
4500
4501         if ((dev_addr->bound_dev_if == ndev->ifindex) &&
4502             (net_eq(dev_net(ndev), dev_addr->net)) &&
4503             memcmp(dev_addr->src_dev_addr, ndev->dev_addr, ndev->addr_len)) {
4504                 pr_info("RDMA CM addr change for ndev %s used by id %p\n",
4505                         ndev->name, &id_priv->id);
4506                 work = kzalloc(sizeof *work, GFP_KERNEL);
4507                 if (!work)
4508                         return -ENOMEM;
4509
4510                 INIT_WORK(&work->work, cma_ndev_work_handler);
4511                 work->id = id_priv;
4512                 work->event.event = RDMA_CM_EVENT_ADDR_CHANGE;
4513                 atomic_inc(&id_priv->refcount);
4514                 queue_work(cma_wq, &work->work);
4515         }
4516
4517         return 0;
4518 }
4519
4520 static int cma_netdev_callback(struct notifier_block *self, unsigned long event,
4521                                void *ptr)
4522 {
4523         struct net_device *ndev = netdev_notifier_info_to_dev(ptr);
4524         struct cma_device *cma_dev;
4525         struct rdma_id_private *id_priv;
4526         int ret = NOTIFY_DONE;
4527
4528         if (event != NETDEV_BONDING_FAILOVER)
4529                 return NOTIFY_DONE;
4530
4531         if (!netif_is_bond_master(ndev))
4532                 return NOTIFY_DONE;
4533
4534         mutex_lock(&lock);
4535         list_for_each_entry(cma_dev, &dev_list, list)
4536                 list_for_each_entry(id_priv, &cma_dev->id_list, list) {
4537                         ret = cma_netdev_change(ndev, id_priv);
4538                         if (ret)
4539                                 goto out;
4540                 }
4541
4542 out:
4543         mutex_unlock(&lock);
4544         return ret;
4545 }
4546
4547 static struct notifier_block cma_nb = {
4548         .notifier_call = cma_netdev_callback
4549 };
4550
4551 static void cma_add_one(struct ib_device *device)
4552 {
4553         struct cma_device *cma_dev;
4554         struct rdma_id_private *id_priv;
4555         unsigned int i;
4556         unsigned long supported_gids = 0;
4557
4558         cma_dev = kmalloc(sizeof *cma_dev, GFP_KERNEL);
4559         if (!cma_dev)
4560                 return;
4561
4562         cma_dev->device = device;
4563         cma_dev->default_gid_type = kcalloc(device->phys_port_cnt,
4564                                             sizeof(*cma_dev->default_gid_type),
4565                                             GFP_KERNEL);
4566         if (!cma_dev->default_gid_type)
4567                 goto free_cma_dev;
4568
4569         cma_dev->default_roce_tos = kcalloc(device->phys_port_cnt,
4570                                             sizeof(*cma_dev->default_roce_tos),
4571                                             GFP_KERNEL);
4572         if (!cma_dev->default_roce_tos)
4573                 goto free_gid_type;
4574
4575         rdma_for_each_port (device, i) {
4576                 supported_gids = roce_gid_type_mask_support(device, i);
4577                 WARN_ON(!supported_gids);
4578                 if (supported_gids & (1 << CMA_PREFERRED_ROCE_GID_TYPE))
4579                         cma_dev->default_gid_type[i - rdma_start_port(device)] =
4580                                 CMA_PREFERRED_ROCE_GID_TYPE;
4581                 else
4582                         cma_dev->default_gid_type[i - rdma_start_port(device)] =
4583                                 find_first_bit(&supported_gids, BITS_PER_LONG);
4584                 cma_dev->default_roce_tos[i - rdma_start_port(device)] = 0;
4585         }
4586
4587         init_completion(&cma_dev->comp);
4588         atomic_set(&cma_dev->refcount, 1);
4589         INIT_LIST_HEAD(&cma_dev->id_list);
4590         ib_set_client_data(device, &cma_client, cma_dev);
4591
4592         mutex_lock(&lock);
4593         list_add_tail(&cma_dev->list, &dev_list);
4594         list_for_each_entry(id_priv, &listen_any_list, list)
4595                 cma_listen_on_dev(id_priv, cma_dev);
4596         mutex_unlock(&lock);
4597
4598         return;
4599
4600 free_gid_type:
4601         kfree(cma_dev->default_gid_type);
4602
4603 free_cma_dev:
4604         kfree(cma_dev);
4605
4606         return;
4607 }
4608
4609 static int cma_remove_id_dev(struct rdma_id_private *id_priv)
4610 {
4611         struct rdma_cm_event event = {};
4612         enum rdma_cm_state state;
4613         int ret = 0;
4614
4615         /* Record that we want to remove the device */
4616         state = cma_exch(id_priv, RDMA_CM_DEVICE_REMOVAL);
4617         if (state == RDMA_CM_DESTROYING)
4618                 return 0;
4619
4620         cma_cancel_operation(id_priv, state);
4621         mutex_lock(&id_priv->handler_mutex);
4622
4623         /* Check for destruction from another callback. */
4624         if (!cma_comp(id_priv, RDMA_CM_DEVICE_REMOVAL))
4625                 goto out;
4626
4627         event.event = RDMA_CM_EVENT_DEVICE_REMOVAL;
4628         ret = id_priv->id.event_handler(&id_priv->id, &event);
4629 out:
4630         mutex_unlock(&id_priv->handler_mutex);
4631         return ret;
4632 }
4633
4634 static void cma_process_remove(struct cma_device *cma_dev)
4635 {
4636         struct rdma_id_private *id_priv;
4637         int ret;
4638
4639         mutex_lock(&lock);
4640         while (!list_empty(&cma_dev->id_list)) {
4641                 id_priv = list_entry(cma_dev->id_list.next,
4642                                      struct rdma_id_private, list);
4643
4644                 list_del(&id_priv->listen_list);
4645                 list_del_init(&id_priv->list);
4646                 atomic_inc(&id_priv->refcount);
4647                 mutex_unlock(&lock);
4648
4649                 ret = id_priv->internal_id ? 1 : cma_remove_id_dev(id_priv);
4650                 cma_deref_id(id_priv);
4651                 if (ret)
4652                         rdma_destroy_id(&id_priv->id);
4653
4654                 mutex_lock(&lock);
4655         }
4656         mutex_unlock(&lock);
4657
4658         cma_deref_dev(cma_dev);
4659         wait_for_completion(&cma_dev->comp);
4660 }
4661
4662 static void cma_remove_one(struct ib_device *device, void *client_data)
4663 {
4664         struct cma_device *cma_dev = client_data;
4665
4666         if (!cma_dev)
4667                 return;
4668
4669         mutex_lock(&lock);
4670         list_del(&cma_dev->list);
4671         mutex_unlock(&lock);
4672
4673         cma_process_remove(cma_dev);
4674         kfree(cma_dev->default_roce_tos);
4675         kfree(cma_dev->default_gid_type);
4676         kfree(cma_dev);
4677 }
4678
4679 static int cma_init_net(struct net *net)
4680 {
4681         struct cma_pernet *pernet = cma_pernet(net);
4682
4683         xa_init(&pernet->tcp_ps);
4684         xa_init(&pernet->udp_ps);
4685         xa_init(&pernet->ipoib_ps);
4686         xa_init(&pernet->ib_ps);
4687
4688         return 0;
4689 }
4690
4691 static void cma_exit_net(struct net *net)
4692 {
4693         struct cma_pernet *pernet = cma_pernet(net);
4694
4695         WARN_ON(!xa_empty(&pernet->tcp_ps));
4696         WARN_ON(!xa_empty(&pernet->udp_ps));
4697         WARN_ON(!xa_empty(&pernet->ipoib_ps));
4698         WARN_ON(!xa_empty(&pernet->ib_ps));
4699 }
4700
4701 static struct pernet_operations cma_pernet_operations = {
4702         .init = cma_init_net,
4703         .exit = cma_exit_net,
4704         .id = &cma_pernet_id,
4705         .size = sizeof(struct cma_pernet),
4706 };
4707
4708 static int __init cma_init(void)
4709 {
4710         int ret;
4711
4712         cma_wq = alloc_ordered_workqueue("rdma_cm", WQ_MEM_RECLAIM);
4713         if (!cma_wq)
4714                 return -ENOMEM;
4715
4716         ret = register_pernet_subsys(&cma_pernet_operations);
4717         if (ret)
4718                 goto err_wq;
4719
4720         ib_sa_register_client(&sa_client);
4721         register_netdevice_notifier(&cma_nb);
4722
4723         ret = ib_register_client(&cma_client);
4724         if (ret)
4725                 goto err;
4726
4727         ret = cma_configfs_init();
4728         if (ret)
4729                 goto err_ib;
4730
4731         return 0;
4732
4733 err_ib:
4734         ib_unregister_client(&cma_client);
4735 err:
4736         unregister_netdevice_notifier(&cma_nb);
4737         ib_sa_unregister_client(&sa_client);
4738 err_wq:
4739         destroy_workqueue(cma_wq);
4740         return ret;
4741 }
4742
4743 static void __exit cma_cleanup(void)
4744 {
4745         cma_configfs_exit();
4746         ib_unregister_client(&cma_client);
4747         unregister_netdevice_notifier(&cma_nb);
4748         ib_sa_unregister_client(&sa_client);
4749         unregister_pernet_subsys(&cma_pernet_operations);
4750         destroy_workqueue(cma_wq);
4751 }
4752
4753 module_init(cma_init);
4754 module_exit(cma_cleanup);