drivers/infiniband/core/cma.c

   1 // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
   2 /*
   3  * Copyright (c) 2005 Voltaire Inc.  All rights reserved.
   4  * Copyright (c) 2002-2005, Network Appliance, Inc. All rights reserved.
   5  * Copyright (c) 1999-2019, Mellanox Technologies, Inc. All rights reserved.
   6  * Copyright (c) 2005-2006 Intel Corporation.  All rights reserved.
   7  */
   8
   9 #include <linux/completion.h>
  10 #include <linux/in.h>
  11 #include <linux/in6.h>
  12 #include <linux/mutex.h>
  13 #include <linux/random.h>
  14 #include <linux/igmp.h>
  15 #include <linux/xarray.h>
  16 #include <linux/inetdevice.h>
  17 #include <linux/slab.h>
  18 #include <linux/module.h>
  19 #include <net/route.h>
  20
  21 #include <net/net_namespace.h>
  22 #include <net/netns/generic.h>
  23 #include <net/tcp.h>
  24 #include <net/ipv6.h>
  25 #include <net/ip_fib.h>
  26 #include <net/ip6_route.h>
  27
  28 #include <rdma/rdma_cm.h>
  29 #include <rdma/rdma_cm_ib.h>
  30 #include <rdma/rdma_netlink.h>
  31 #include <rdma/ib.h>
  32 #include <rdma/ib_cache.h>
  33 #include <rdma/ib_cm.h>
  34 #include <rdma/ib_sa.h>
  35 #include <rdma/iw_cm.h>
  36
  37 #include "core_priv.h"
  38 #include "cma_priv.h"
  39 #include "cma_trace.h"
  40
  41 MODULE_AUTHOR("Sean Hefty");
  42 MODULE_DESCRIPTION("Generic RDMA CM Agent");
  43 MODULE_LICENSE("Dual BSD/GPL");
  44
  45 #define CMA_CM_RESPONSE_TIMEOUT 20
  46 #define CMA_QUERY_CLASSPORT_INFO_TIMEOUT 3000
  47 #define CMA_MAX_CM_RETRIES 15
  48 #define CMA_CM_MRA_SETTING (IB_CM_MRA_FLAG_DELAY | 24)
  49 #define CMA_IBOE_PACKET_LIFETIME 18
  50 #define CMA_PREFERRED_ROCE_GID_TYPE IB_GID_TYPE_ROCE_UDP_ENCAP
  51
  52 static const char * const cma_events[] = {
  53         [RDMA_CM_EVENT_ADDR_RESOLVED]    = "address resolved",
  54         [RDMA_CM_EVENT_ADDR_ERROR]       = "address error",
  55         [RDMA_CM_EVENT_ROUTE_RESOLVED]   = "route resolved ",
  56         [RDMA_CM_EVENT_ROUTE_ERROR]      = "route error",
  57         [RDMA_CM_EVENT_CONNECT_REQUEST]  = "connect request",
  58         [RDMA_CM_EVENT_CONNECT_RESPONSE] = "connect response",
  59         [RDMA_CM_EVENT_CONNECT_ERROR]    = "connect error",
  60         [RDMA_CM_EVENT_UNREACHABLE]      = "unreachable",
  61         [RDMA_CM_EVENT_REJECTED]         = "rejected",
  62         [RDMA_CM_EVENT_ESTABLISHED]      = "established",
  63         [RDMA_CM_EVENT_DISCONNECTED]     = "disconnected",
  64         [RDMA_CM_EVENT_DEVICE_REMOVAL]   = "device removal",
  65         [RDMA_CM_EVENT_MULTICAST_JOIN]   = "multicast join",
  66         [RDMA_CM_EVENT_MULTICAST_ERROR]  = "multicast error",
  67         [RDMA_CM_EVENT_ADDR_CHANGE]      = "address change",
  68         [RDMA_CM_EVENT_TIMEWAIT_EXIT]    = "timewait exit",
  69 };
  70
  71 const char *__attribute_const__ rdma_event_msg(enum rdma_cm_event_type event)
  72 {
  73         size_t index = event;
  74
  75         return (index < ARRAY_SIZE(cma_events) && cma_events[index]) ?
  76                         cma_events[index] : "unrecognized event";
  77 }
  78 EXPORT_SYMBOL(rdma_event_msg);
  79
  80 const char *__attribute_const__ rdma_reject_msg(struct rdma_cm_id *id,
  81                                                 int reason)
  82 {
  83         if (rdma_ib_or_roce(id->device, id->port_num))
  84                 return ibcm_reject_msg(reason);
  85
  86         if (rdma_protocol_iwarp(id->device, id->port_num))
  87                 return iwcm_reject_msg(reason);
  88
  89         WARN_ON_ONCE(1);
  90         return "unrecognized transport";
  91 }
  92 EXPORT_SYMBOL(rdma_reject_msg);
  93
  94 bool rdma_is_consumer_reject(struct rdma_cm_id *id, int reason)
  95 {
  96         if (rdma_ib_or_roce(id->device, id->port_num))
  97                 return reason == IB_CM_REJ_CONSUMER_DEFINED;
  98
  99         if (rdma_protocol_iwarp(id->device, id->port_num))
 100                 return reason == -ECONNREFUSED;
 101
 102         WARN_ON_ONCE(1);
 103         return false;
 104 }
 105 EXPORT_SYMBOL(rdma_is_consumer_reject);
 106
 107 const void *rdma_consumer_reject_data(struct rdma_cm_id *id,
 108                                       struct rdma_cm_event *ev, u8 *data_len)
 109 {
 110         const void *p;
 111
 112         if (rdma_is_consumer_reject(id, ev->status)) {
 113                 *data_len = ev->param.conn.private_data_len;
 114                 p = ev->param.conn.private_data;
 115         } else {
 116                 *data_len = 0;
 117                 p = NULL;
 118         }
 119         return p;
 120 }
 121 EXPORT_SYMBOL(rdma_consumer_reject_data);
 122
 123 /**
 124  * rdma_iw_cm_id() - return the iw_cm_id pointer for this cm_id.
 125  * @id: Communication Identifier
 126  */
 127 struct iw_cm_id *rdma_iw_cm_id(struct rdma_cm_id *id)
 128 {
 129         struct rdma_id_private *id_priv;
 130
 131         id_priv = container_of(id, struct rdma_id_private, id);
 132         if (id->device->node_type == RDMA_NODE_RNIC)
 133                 return id_priv->cm_id.iw;
 134         return NULL;
 135 }
 136 EXPORT_SYMBOL(rdma_iw_cm_id);
 137
 138 /**
 139  * rdma_res_to_id() - return the rdma_cm_id pointer for this restrack.
 140  * @res: rdma resource tracking entry pointer
 141  */
 142 struct rdma_cm_id *rdma_res_to_id(struct rdma_restrack_entry *res)
 143 {
 144         struct rdma_id_private *id_priv =
 145                 container_of(res, struct rdma_id_private, res);
 146
 147         return &id_priv->id;
 148 }
 149 EXPORT_SYMBOL(rdma_res_to_id);
 150
 151 static void cma_add_one(struct ib_device *device);
 152 static void cma_remove_one(struct ib_device *device, void *client_data);
 153
 154 static struct ib_client cma_client = {
 155         .name   = "cma",
 156         .add    = cma_add_one,
 157         .remove = cma_remove_one
 158 };
 159
 160 static struct ib_sa_client sa_client;
 161 static LIST_HEAD(dev_list);
 162 static LIST_HEAD(listen_any_list);
 163 static DEFINE_MUTEX(lock);
 164 static struct workqueue_struct *cma_wq;
 165 static unsigned int cma_pernet_id;
 166
 167 struct cma_pernet {
 168         struct xarray tcp_ps;
 169         struct xarray udp_ps;
 170         struct xarray ipoib_ps;
 171         struct xarray ib_ps;
 172 };
 173
 174 static struct cma_pernet *cma_pernet(struct net *net)
 175 {
 176         return net_generic(net, cma_pernet_id);
 177 }
 178
 179 static
 180 struct xarray *cma_pernet_xa(struct net *net, enum rdma_ucm_port_space ps)
 181 {
 182         struct cma_pernet *pernet = cma_pernet(net);
 183
 184         switch (ps) {
 185         case RDMA_PS_TCP:
 186                 return &pernet->tcp_ps;
 187         case RDMA_PS_UDP:
 188                 return &pernet->udp_ps;
 189         case RDMA_PS_IPOIB:
 190                 return &pernet->ipoib_ps;
 191         case RDMA_PS_IB:
 192                 return &pernet->ib_ps;
 193         default:
 194                 return NULL;
 195         }
 196 }
 197
 198 struct cma_device {
 199         struct list_head        list;
 200         struct ib_device        *device;
 201         struct completion       comp;
 202         refcount_t refcount;
 203         struct list_head        id_list;
 204         enum ib_gid_type        *default_gid_type;
 205         u8                      *default_roce_tos;
 206 };
 207
 208 struct rdma_bind_list {
 209         enum rdma_ucm_port_space ps;
 210         struct hlist_head       owners;
 211         unsigned short          port;
 212 };
 213
 214 struct class_port_info_context {
 215         struct ib_class_port_info       *class_port_info;
 216         struct ib_device                *device;
 217         struct completion               done;
 218         struct ib_sa_query              *sa_query;
 219         u8                              port_num;
 220 };
 221
 222 static int cma_ps_alloc(struct net *net, enum rdma_ucm_port_space ps,
 223                         struct rdma_bind_list *bind_list, int snum)
 224 {
 225         struct xarray *xa = cma_pernet_xa(net, ps);
 226
 227         return xa_insert(xa, snum, bind_list, GFP_KERNEL);
 228 }
 229
 230 static struct rdma_bind_list *cma_ps_find(struct net *net,
 231                                           enum rdma_ucm_port_space ps, int snum)
 232 {
 233         struct xarray *xa = cma_pernet_xa(net, ps);
 234
 235         return xa_load(xa, snum);
 236 }
 237
 238 static void cma_ps_remove(struct net *net, enum rdma_ucm_port_space ps,
 239                           int snum)
 240 {
 241         struct xarray *xa = cma_pernet_xa(net, ps);
 242
 243         xa_erase(xa, snum);
 244 }
 245
 246 enum {
 247         CMA_OPTION_AFONLY,
 248 };
 249
 250 void cma_dev_get(struct cma_device *cma_dev)
 251 {
 252         refcount_inc(&cma_dev->refcount);
 253 }
 254
 255 void cma_dev_put(struct cma_device *cma_dev)
 256 {
 257         if (refcount_dec_and_test(&cma_dev->refcount))
 258                 complete(&cma_dev->comp);
 259 }
 260
 261 struct cma_device *cma_enum_devices_by_ibdev(cma_device_filter  filter,
 262                                              void               *cookie)
 263 {
 264         struct cma_device *cma_dev;
 265         struct cma_device *found_cma_dev = NULL;
 266
 267         mutex_lock(&lock);
 268
 269         list_for_each_entry(cma_dev, &dev_list, list)
 270                 if (filter(cma_dev->device, cookie)) {
 271                         found_cma_dev = cma_dev;
 272                         break;
 273                 }
 274
 275         if (found_cma_dev)
 276                 cma_dev_get(found_cma_dev);
 277         mutex_unlock(&lock);
 278         return found_cma_dev;
 279 }
 280
 281 int cma_get_default_gid_type(struct cma_device *cma_dev,
 282                              unsigned int port)
 283 {
 284         if (!rdma_is_port_valid(cma_dev->device, port))
 285                 return -EINVAL;
 286
 287         return cma_dev->default_gid_type[port - rdma_start_port(cma_dev->device)];
 288 }
 289
 290 int cma_set_default_gid_type(struct cma_device *cma_dev,
 291                              unsigned int port,
 292                              enum ib_gid_type default_gid_type)
 293 {
 294         unsigned long supported_gids;
 295
 296         if (!rdma_is_port_valid(cma_dev->device, port))
 297                 return -EINVAL;
 298
 299         supported_gids = roce_gid_type_mask_support(cma_dev->device, port);
 300
 301         if (!(supported_gids & 1 << default_gid_type))
 302                 return -EINVAL;
 303
 304         cma_dev->default_gid_type[port - rdma_start_port(cma_dev->device)] =
 305                 default_gid_type;
 306
 307         return 0;
 308 }
 309
 310 int cma_get_default_roce_tos(struct cma_device *cma_dev, unsigned int port)
 311 {
 312         if (!rdma_is_port_valid(cma_dev->device, port))
 313                 return -EINVAL;
 314
 315         return cma_dev->default_roce_tos[port - rdma_start_port(cma_dev->device)];
 316 }
 317
 318 int cma_set_default_roce_tos(struct cma_device *cma_dev, unsigned int port,
 319                              u8 default_roce_tos)
 320 {
 321         if (!rdma_is_port_valid(cma_dev->device, port))
 322                 return -EINVAL;
 323
 324         cma_dev->default_roce_tos[port - rdma_start_port(cma_dev->device)] =
 325                  default_roce_tos;
 326
 327         return 0;
 328 }
 329 struct ib_device *cma_get_ib_dev(struct cma_device *cma_dev)
 330 {
 331         return cma_dev->device;
 332 }
 333
 334 /*
 335  * Device removal can occur at anytime, so we need extra handling to
 336  * serialize notifying the user of device removal with other callbacks.
 337  * We do this by disabling removal notification while a callback is in process,
 338  * and reporting it after the callback completes.
 339  */
 340
 341 struct cma_multicast {
 342         struct rdma_id_private *id_priv;
 343         union {
 344                 struct ib_sa_multicast *ib;
 345         } multicast;
 346         struct list_head        list;
 347         void                    *context;
 348         struct sockaddr_storage addr;
 349         struct kref             mcref;
 350         u8                      join_state;
 351 };
 352
 353 struct cma_work {
 354         struct work_struct      work;
 355         struct rdma_id_private  *id;
 356         enum rdma_cm_state      old_state;
 357         enum rdma_cm_state      new_state;
 358         struct rdma_cm_event    event;
 359 };
 360
 361 struct cma_ndev_work {
 362         struct work_struct      work;
 363         struct rdma_id_private  *id;
 364         struct rdma_cm_event    event;
 365 };
 366
 367 struct iboe_mcast_work {
 368         struct work_struct       work;
 369         struct rdma_id_private  *id;
 370         struct cma_multicast    *mc;
 371 };
 372
 373 union cma_ip_addr {
 374         struct in6_addr ip6;
 375         struct {
 376                 __be32 pad[3];
 377                 __be32 addr;
 378         } ip4;
 379 };
 380
 381 struct cma_hdr {
 382         u8 cma_version;
 383         u8 ip_version;  /* IP version: 7:4 */
 384         __be16 port;
 385         union cma_ip_addr src_addr;
 386         union cma_ip_addr dst_addr;
 387 };
 388
 389 #define CMA_VERSION 0x00
 390
 391 struct cma_req_info {
 392         struct sockaddr_storage listen_addr_storage;
 393         struct sockaddr_storage src_addr_storage;
 394         struct ib_device *device;
 395         union ib_gid local_gid;
 396         __be64 service_id;
 397         int port;
 398         bool has_gid;
 399         u16 pkey;
 400 };
 401
 402 static int cma_comp(struct rdma_id_private *id_priv, enum rdma_cm_state comp)
 403 {
 404         unsigned long flags;
 405         int ret;
 406
 407         spin_lock_irqsave(&id_priv->lock, flags);
 408         ret = (id_priv->state == comp);
 409         spin_unlock_irqrestore(&id_priv->lock, flags);
 410         return ret;
 411 }
 412
 413 static int cma_comp_exch(struct rdma_id_private *id_priv,
 414                          enum rdma_cm_state comp, enum rdma_cm_state exch)
 415 {
 416         unsigned long flags;
 417         int ret;
 418
 419         spin_lock_irqsave(&id_priv->lock, flags);
 420         if ((ret = (id_priv->state == comp)))
 421                 id_priv->state = exch;
 422         spin_unlock_irqrestore(&id_priv->lock, flags);
 423         return ret;
 424 }
 425
 426 static enum rdma_cm_state cma_exch(struct rdma_id_private *id_priv,
 427                                    enum rdma_cm_state exch)
 428 {
 429         unsigned long flags;
 430         enum rdma_cm_state old;
 431
 432         spin_lock_irqsave(&id_priv->lock, flags);
 433         old = id_priv->state;
 434         id_priv->state = exch;
 435         spin_unlock_irqrestore(&id_priv->lock, flags);
 436         return old;
 437 }
 438
 439 static inline u8 cma_get_ip_ver(const struct cma_hdr *hdr)
 440 {
 441         return hdr->ip_version >> 4;
 442 }
 443
 444 static inline void cma_set_ip_ver(struct cma_hdr *hdr, u8 ip_ver)
 445 {
 446         hdr->ip_version = (ip_ver << 4) | (hdr->ip_version & 0xF);
 447 }
 448
 449 static int cma_igmp_send(struct net_device *ndev, union ib_gid *mgid, bool join)
 450 {
 451         struct in_device *in_dev = NULL;
 452
 453         if (ndev) {
 454                 rtnl_lock();
 455                 in_dev = __in_dev_get_rtnl(ndev);
 456                 if (in_dev) {
 457                         if (join)
 458                                 ip_mc_inc_group(in_dev,
 459                                                 *(__be32 *)(mgid->raw + 12));
 460                         else
 461                                 ip_mc_dec_group(in_dev,
 462                                                 *(__be32 *)(mgid->raw + 12));
 463                 }
 464                 rtnl_unlock();
 465         }
 466         return (in_dev) ? 0 : -ENODEV;
 467 }
 468
 469 static void _cma_attach_to_dev(struct rdma_id_private *id_priv,
 470                                struct cma_device *cma_dev)
 471 {
 472         cma_dev_get(cma_dev);
 473         id_priv->cma_dev = cma_dev;
 474         id_priv->id.device = cma_dev->device;
 475         id_priv->id.route.addr.dev_addr.transport =
 476                 rdma_node_get_transport(cma_dev->device->node_type);
 477         list_add_tail(&id_priv->list, &cma_dev->id_list);
 478         if (id_priv->res.kern_name)
 479                 rdma_restrack_kadd(&id_priv->res);
 480         else
 481                 rdma_restrack_uadd(&id_priv->res);
 482 }
 483
 484 static void cma_attach_to_dev(struct rdma_id_private *id_priv,
 485                               struct cma_device *cma_dev)
 486 {
 487         _cma_attach_to_dev(id_priv, cma_dev);
 488         id_priv->gid_type =
 489                 cma_dev->default_gid_type[id_priv->id.port_num -
 490                                           rdma_start_port(cma_dev->device)];
 491 }
 492
 493 static inline void release_mc(struct kref *kref)
 494 {
 495         struct cma_multicast *mc = container_of(kref, struct cma_multicast, mcref);
 496
 497         kfree(mc->multicast.ib);
 498         kfree(mc);
 499 }
 500
 501 static void cma_release_dev(struct rdma_id_private *id_priv)
 502 {
 503         mutex_lock(&lock);
 504         list_del(&id_priv->list);
 505         cma_dev_put(id_priv->cma_dev);
 506         id_priv->cma_dev = NULL;
 507         mutex_unlock(&lock);
 508 }
 509
 510 static inline struct sockaddr *cma_src_addr(struct rdma_id_private *id_priv)
 511 {
 512         return (struct sockaddr *) &id_priv->id.route.addr.src_addr;
 513 }
 514
 515 static inline struct sockaddr *cma_dst_addr(struct rdma_id_private *id_priv)
 516 {
 517         return (struct sockaddr *) &id_priv->id.route.addr.dst_addr;
 518 }
 519
 520 static inline unsigned short cma_family(struct rdma_id_private *id_priv)
 521 {
 522         return id_priv->id.route.addr.src_addr.ss_family;
 523 }
 524
 525 static int cma_set_qkey(struct rdma_id_private *id_priv, u32 qkey)
 526 {
 527         struct ib_sa_mcmember_rec rec;
 528         int ret = 0;
 529
 530         if (id_priv->qkey) {
 531                 if (qkey && id_priv->qkey != qkey)
 532                         return -EINVAL;
 533                 return 0;
 534         }
 535
 536         if (qkey) {
 537                 id_priv->qkey = qkey;
 538                 return 0;
 539         }
 540
 541         switch (id_priv->id.ps) {
 542         case RDMA_PS_UDP:
 543         case RDMA_PS_IB:
 544                 id_priv->qkey = RDMA_UDP_QKEY;
 545                 break;
 546         case RDMA_PS_IPOIB:
 547                 ib_addr_get_mgid(&id_priv->id.route.addr.dev_addr, &rec.mgid);
 548                 ret = ib_sa_get_mcmember_rec(id_priv->id.device,
 549                                              id_priv->id.port_num, &rec.mgid,
 550                                              &rec);
 551                 if (!ret)
 552                         id_priv->qkey = be32_to_cpu(rec.qkey);
 553                 break;
 554         default:
 555                 break;
 556         }
 557         return ret;
 558 }
 559
 560 static void cma_translate_ib(struct sockaddr_ib *sib, struct rdma_dev_addr *dev_addr)
 561 {
 562         dev_addr->dev_type = ARPHRD_INFINIBAND;
 563         rdma_addr_set_sgid(dev_addr, (union ib_gid *) &sib->sib_addr);
 564         ib_addr_set_pkey(dev_addr, ntohs(sib->sib_pkey));
 565 }
 566
 567 static int cma_translate_addr(struct sockaddr *addr, struct rdma_dev_addr *dev_addr)
 568 {
 569         int ret;
 570
 571         if (addr->sa_family != AF_IB) {
 572                 ret = rdma_translate_ip(addr, dev_addr);
 573         } else {
 574                 cma_translate_ib((struct sockaddr_ib *) addr, dev_addr);
 575                 ret = 0;
 576         }
 577
 578         return ret;
 579 }
 580
 581 static const struct ib_gid_attr *
 582 cma_validate_port(struct ib_device *device, u8 port,
 583                   enum ib_gid_type gid_type,
 584                   union ib_gid *gid,
 585                   struct rdma_id_private *id_priv)
 586 {
 587         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
 588         int bound_if_index = dev_addr->bound_dev_if;
 589         const struct ib_gid_attr *sgid_attr;
 590         int dev_type = dev_addr->dev_type;
 591         struct net_device *ndev = NULL;
 592
 593         if (!rdma_dev_access_netns(device, id_priv->id.route.addr.dev_addr.net))
 594                 return ERR_PTR(-ENODEV);
 595
 596         if ((dev_type == ARPHRD_INFINIBAND) && !rdma_protocol_ib(device, port))
 597                 return ERR_PTR(-ENODEV);
 598
 599         if ((dev_type != ARPHRD_INFINIBAND) && rdma_protocol_ib(device, port))
 600                 return ERR_PTR(-ENODEV);
 601
 602         if (dev_type == ARPHRD_ETHER && rdma_protocol_roce(device, port)) {
 603                 ndev = dev_get_by_index(dev_addr->net, bound_if_index);
 604                 if (!ndev)
 605                         return ERR_PTR(-ENODEV);
 606         } else {
 607                 gid_type = IB_GID_TYPE_IB;
 608         }
 609
 610         sgid_attr = rdma_find_gid_by_port(device, gid, gid_type, port, ndev);
 611         if (ndev)
 612                 dev_put(ndev);
 613         return sgid_attr;
 614 }
 615
 616 static void cma_bind_sgid_attr(struct rdma_id_private *id_priv,
 617                                const struct ib_gid_attr *sgid_attr)
 618 {
 619         WARN_ON(id_priv->id.route.addr.dev_addr.sgid_attr);
 620         id_priv->id.route.addr.dev_addr.sgid_attr = sgid_attr;
 621 }
 622
 623 /**
 624  * cma_acquire_dev_by_src_ip - Acquire cma device, port, gid attribute
 625  * based on source ip address.
 626  * @id_priv:    cm_id which should be bound to cma device
 627  *
 628  * cma_acquire_dev_by_src_ip() binds cm id to cma device, port and GID attribute
 629  * based on source IP address. It returns 0 on success or error code otherwise.
 630  * It is applicable to active and passive side cm_id.
 631  */
 632 static int cma_acquire_dev_by_src_ip(struct rdma_id_private *id_priv)
 633 {
 634         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
 635         const struct ib_gid_attr *sgid_attr;
 636         union ib_gid gid, iboe_gid, *gidp;
 637         struct cma_device *cma_dev;
 638         enum ib_gid_type gid_type;
 639         int ret = -ENODEV;
 640         unsigned int port;
 641
 642         if (dev_addr->dev_type != ARPHRD_INFINIBAND &&
 643             id_priv->id.ps == RDMA_PS_IPOIB)
 644                 return -EINVAL;
 645
 646         rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
 647                     &iboe_gid);
 648
 649         memcpy(&gid, dev_addr->src_dev_addr +
 650                rdma_addr_gid_offset(dev_addr), sizeof(gid));
 651
 652         mutex_lock(&lock);
 653         list_for_each_entry(cma_dev, &dev_list, list) {
 654                 rdma_for_each_port (cma_dev->device, port) {
 655                         gidp = rdma_protocol_roce(cma_dev->device, port) ?
 656                                &iboe_gid : &gid;
 657                         gid_type = cma_dev->default_gid_type[port - 1];
 658                         sgid_attr = cma_validate_port(cma_dev->device, port,
 659                                                       gid_type, gidp, id_priv);
 660                         if (!IS_ERR(sgid_attr)) {
 661                                 id_priv->id.port_num = port;
 662                                 cma_bind_sgid_attr(id_priv, sgid_attr);
 663                                 cma_attach_to_dev(id_priv, cma_dev);
 664                                 ret = 0;
 665                                 goto out;
 666                         }
 667                 }
 668         }
 669 out:
 670         mutex_unlock(&lock);
 671         return ret;
 672 }
 673
 674 /**
 675  * cma_ib_acquire_dev - Acquire cma device, port and SGID attribute
 676  * @id_priv:            cm id to bind to cma device
 677  * @listen_id_priv:     listener cm id to match against
 678  * @req:                Pointer to req structure containaining incoming
 679  *                      request information
 680  * cma_ib_acquire_dev() acquires cma device, port and SGID attribute when
 681  * rdma device matches for listen_id and incoming request. It also verifies
 682  * that a GID table entry is present for the source address.
 683  * Returns 0 on success, or returns error code otherwise.
 684  */
 685 static int cma_ib_acquire_dev(struct rdma_id_private *id_priv,
 686                               const struct rdma_id_private *listen_id_priv,
 687                               struct cma_req_info *req)
 688 {
 689         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
 690         const struct ib_gid_attr *sgid_attr;
 691         enum ib_gid_type gid_type;
 692         union ib_gid gid;
 693
 694         if (dev_addr->dev_type != ARPHRD_INFINIBAND &&
 695             id_priv->id.ps == RDMA_PS_IPOIB)
 696                 return -EINVAL;
 697
 698         if (rdma_protocol_roce(req->device, req->port))
 699                 rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
 700                             &gid);
 701         else
 702                 memcpy(&gid, dev_addr->src_dev_addr +
 703                        rdma_addr_gid_offset(dev_addr), sizeof(gid));
 704
 705         gid_type = listen_id_priv->cma_dev->default_gid_type[req->port - 1];
 706         sgid_attr = cma_validate_port(req->device, req->port,
 707                                       gid_type, &gid, id_priv);
 708         if (IS_ERR(sgid_attr))
 709                 return PTR_ERR(sgid_attr);
 710
 711         id_priv->id.port_num = req->port;
 712         cma_bind_sgid_attr(id_priv, sgid_attr);
 713         /* Need to acquire lock to protect against reader
 714          * of cma_dev->id_list such as cma_netdev_callback() and
 715          * cma_process_remove().
 716          */
 717         mutex_lock(&lock);
 718         cma_attach_to_dev(id_priv, listen_id_priv->cma_dev);
 719         mutex_unlock(&lock);
 720         return 0;
 721 }
 722
 723 static int cma_iw_acquire_dev(struct rdma_id_private *id_priv,
 724                               const struct rdma_id_private *listen_id_priv)
 725 {
 726         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
 727         const struct ib_gid_attr *sgid_attr;
 728         struct cma_device *cma_dev;
 729         enum ib_gid_type gid_type;
 730         int ret = -ENODEV;
 731         unsigned int port;
 732         union ib_gid gid;
 733
 734         if (dev_addr->dev_type != ARPHRD_INFINIBAND &&
 735             id_priv->id.ps == RDMA_PS_IPOIB)
 736                 return -EINVAL;
 737
 738         memcpy(&gid, dev_addr->src_dev_addr +
 739                rdma_addr_gid_offset(dev_addr), sizeof(gid));
 740
 741         mutex_lock(&lock);
 742
 743         cma_dev = listen_id_priv->cma_dev;
 744         port = listen_id_priv->id.port_num;
 745         gid_type = listen_id_priv->gid_type;
 746         sgid_attr = cma_validate_port(cma_dev->device, port,
 747                                       gid_type, &gid, id_priv);
 748         if (!IS_ERR(sgid_attr)) {
 749                 id_priv->id.port_num = port;
 750                 cma_bind_sgid_attr(id_priv, sgid_attr);
 751                 ret = 0;
 752                 goto out;
 753         }
 754
 755         list_for_each_entry(cma_dev, &dev_list, list) {
 756                 rdma_for_each_port (cma_dev->device, port) {
 757                         if (listen_id_priv->cma_dev == cma_dev &&
 758                             listen_id_priv->id.port_num == port)
 759                                 continue;
 760
 761                         gid_type = cma_dev->default_gid_type[port - 1];
 762                         sgid_attr = cma_validate_port(cma_dev->device, port,
 763                                                       gid_type, &gid, id_priv);
 764                         if (!IS_ERR(sgid_attr)) {
 765                                 id_priv->id.port_num = port;
 766                                 cma_bind_sgid_attr(id_priv, sgid_attr);
 767                                 ret = 0;
 768                                 goto out;
 769                         }
 770                 }
 771         }
 772
 773 out:
 774         if (!ret)
 775                 cma_attach_to_dev(id_priv, cma_dev);
 776
 777         mutex_unlock(&lock);
 778         return ret;
 779 }
 780
 781 /*
 782  * Select the source IB device and address to reach the destination IB address.
 783  */
 784 static int cma_resolve_ib_dev(struct rdma_id_private *id_priv)
 785 {
 786         struct cma_device *cma_dev, *cur_dev;
 787         struct sockaddr_ib *addr;
 788         union ib_gid gid, sgid, *dgid;
 789         unsigned int p;
 790         u16 pkey, index;
 791         enum ib_port_state port_state;
 792         int i;
 793
 794         cma_dev = NULL;
 795         addr = (struct sockaddr_ib *) cma_dst_addr(id_priv);
 796         dgid = (union ib_gid *) &addr->sib_addr;
 797         pkey = ntohs(addr->sib_pkey);
 798
 799         mutex_lock(&lock);
 800         list_for_each_entry(cur_dev, &dev_list, list) {
 801                 rdma_for_each_port (cur_dev->device, p) {
 802                         if (!rdma_cap_af_ib(cur_dev->device, p))
 803                                 continue;
 804
 805                         if (ib_find_cached_pkey(cur_dev->device, p, pkey, &index))
 806                                 continue;
 807
 808                         if (ib_get_cached_port_state(cur_dev->device, p, &port_state))
 809                                 continue;
 810                         for (i = 0; !rdma_query_gid(cur_dev->device,
 811                                                     p, i, &gid);
 812                              i++) {
 813                                 if (!memcmp(&gid, dgid, sizeof(gid))) {
 814                                         cma_dev = cur_dev;
 815                                         sgid = gid;
 816                                         id_priv->id.port_num = p;
 817                                         goto found;
 818                                 }
 819
 820                                 if (!cma_dev && (gid.global.subnet_prefix ==
 821                                     dgid->global.subnet_prefix) &&
 822                                     port_state == IB_PORT_ACTIVE) {
 823                                         cma_dev = cur_dev;
 824                                         sgid = gid;
 825                                         id_priv->id.port_num = p;
 826                                         goto found;
 827                                 }
 828                         }
 829                 }
 830         }
 831         mutex_unlock(&lock);
 832         return -ENODEV;
 833
 834 found:
 835         cma_attach_to_dev(id_priv, cma_dev);
 836         mutex_unlock(&lock);
 837         addr = (struct sockaddr_ib *)cma_src_addr(id_priv);
 838         memcpy(&addr->sib_addr, &sgid, sizeof(sgid));
 839         cma_translate_ib(addr, &id_priv->id.route.addr.dev_addr);
 840         return 0;
 841 }
 842
 843 static void cma_id_get(struct rdma_id_private *id_priv)
 844 {
 845         refcount_inc(&id_priv->refcount);
 846 }
 847
 848 static void cma_id_put(struct rdma_id_private *id_priv)
 849 {
 850         if (refcount_dec_and_test(&id_priv->refcount))
 851                 complete(&id_priv->comp);
 852 }
 853
 854 struct rdma_cm_id *__rdma_create_id(struct net *net,
 855                                     rdma_cm_event_handler event_handler,
 856                                     void *context, enum rdma_ucm_port_space ps,
 857                                     enum ib_qp_type qp_type, const char *caller)
 858 {
 859         struct rdma_id_private *id_priv;
 860
 861         id_priv = kzalloc(sizeof *id_priv, GFP_KERNEL);
 862         if (!id_priv)
 863                 return ERR_PTR(-ENOMEM);
 864
 865         rdma_restrack_set_task(&id_priv->res, caller);
 866         id_priv->res.type = RDMA_RESTRACK_CM_ID;
 867         id_priv->state = RDMA_CM_IDLE;
 868         id_priv->id.context = context;
 869         id_priv->id.event_handler = event_handler;
 870         id_priv->id.ps = ps;
 871         id_priv->id.qp_type = qp_type;
 872         id_priv->tos_set = false;
 873         id_priv->timeout_set = false;
 874         id_priv->gid_type = IB_GID_TYPE_IB;
 875         spin_lock_init(&id_priv->lock);
 876         mutex_init(&id_priv->qp_mutex);
 877         init_completion(&id_priv->comp);
 878         refcount_set(&id_priv->refcount, 1);
 879         mutex_init(&id_priv->handler_mutex);
 880         INIT_LIST_HEAD(&id_priv->listen_list);
 881         INIT_LIST_HEAD(&id_priv->mc_list);
 882         get_random_bytes(&id_priv->seq_num, sizeof id_priv->seq_num);
 883         id_priv->id.route.addr.dev_addr.net = get_net(net);
 884         id_priv->seq_num &= 0x00ffffff;
 885
 886         trace_cm_id_create(id_priv);
 887         return &id_priv->id;
 888 }
 889 EXPORT_SYMBOL(__rdma_create_id);
 890
 891 static int cma_init_ud_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
 892 {
 893         struct ib_qp_attr qp_attr;
 894         int qp_attr_mask, ret;
 895
 896         qp_attr.qp_state = IB_QPS_INIT;
 897         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 898         if (ret)
 899                 return ret;
 900
 901         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 902         if (ret)
 903                 return ret;
 904
 905         qp_attr.qp_state = IB_QPS_RTR;
 906         ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
 907         if (ret)
 908                 return ret;
 909
 910         qp_attr.qp_state = IB_QPS_RTS;
 911         qp_attr.sq_psn = 0;
 912         ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE | IB_QP_SQ_PSN);
 913
 914         return ret;
 915 }
 916
 917 static int cma_init_conn_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
 918 {
 919         struct ib_qp_attr qp_attr;
 920         int qp_attr_mask, ret;
 921
 922         qp_attr.qp_state = IB_QPS_INIT;
 923         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 924         if (ret)
 925                 return ret;
 926
 927         return ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 928 }
 929
 930 int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
 931                    struct ib_qp_init_attr *qp_init_attr)
 932 {
 933         struct rdma_id_private *id_priv;
 934         struct ib_qp *qp;
 935         int ret;
 936
 937         id_priv = container_of(id, struct rdma_id_private, id);
 938         if (id->device != pd->device) {
 939                 ret = -EINVAL;
 940                 goto out_err;
 941         }
 942
 943         qp_init_attr->port_num = id->port_num;
 944         qp = ib_create_qp(pd, qp_init_attr);
 945         if (IS_ERR(qp)) {
 946                 ret = PTR_ERR(qp);
 947                 goto out_err;
 948         }
 949
 950         if (id->qp_type == IB_QPT_UD)
 951                 ret = cma_init_ud_qp(id_priv, qp);
 952         else
 953                 ret = cma_init_conn_qp(id_priv, qp);
 954         if (ret)
 955                 goto out_destroy;
 956
 957         id->qp = qp;
 958         id_priv->qp_num = qp->qp_num;
 959         id_priv->srq = (qp->srq != NULL);
 960         trace_cm_qp_create(id_priv, pd, qp_init_attr, 0);
 961         return 0;
 962 out_destroy:
 963         ib_destroy_qp(qp);
 964 out_err:
 965         trace_cm_qp_create(id_priv, pd, qp_init_attr, ret);
 966         return ret;
 967 }
 968 EXPORT_SYMBOL(rdma_create_qp);
 969
 970 void rdma_destroy_qp(struct rdma_cm_id *id)
 971 {
 972         struct rdma_id_private *id_priv;
 973
 974         id_priv = container_of(id, struct rdma_id_private, id);
 975         trace_cm_qp_destroy(id_priv);
 976         mutex_lock(&id_priv->qp_mutex);
 977         ib_destroy_qp(id_priv->id.qp);
 978         id_priv->id.qp = NULL;
 979         mutex_unlock(&id_priv->qp_mutex);
 980 }
 981 EXPORT_SYMBOL(rdma_destroy_qp);
 982
 983 static int cma_modify_qp_rtr(struct rdma_id_private *id_priv,
 984                              struct rdma_conn_param *conn_param)
 985 {
 986         struct ib_qp_attr qp_attr;
 987         int qp_attr_mask, ret;
 988
 989         mutex_lock(&id_priv->qp_mutex);
 990         if (!id_priv->id.qp) {
 991                 ret = 0;
 992                 goto out;
 993         }
 994
 995         /* Need to update QP attributes from default values. */
 996         qp_attr.qp_state = IB_QPS_INIT;
 997         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 998         if (ret)
 999                 goto out;
1000
1001         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
1002         if (ret)
1003                 goto out;
1004
1005         qp_attr.qp_state = IB_QPS_RTR;
1006         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
1007         if (ret)
1008                 goto out;
1009
1010         BUG_ON(id_priv->cma_dev->device != id_priv->id.device);
1011
1012         if (conn_param)
1013                 qp_attr.max_dest_rd_atomic = conn_param->responder_resources;
1014         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
1015 out:
1016         mutex_unlock(&id_priv->qp_mutex);
1017         return ret;
1018 }
1019
1020 static int cma_modify_qp_rts(struct rdma_id_private *id_priv,
1021                              struct rdma_conn_param *conn_param)
1022 {
1023         struct ib_qp_attr qp_attr;
1024         int qp_attr_mask, ret;
1025
1026         mutex_lock(&id_priv->qp_mutex);
1027         if (!id_priv->id.qp) {
1028                 ret = 0;
1029                 goto out;
1030         }
1031
1032         qp_attr.qp_state = IB_QPS_RTS;
1033         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
1034         if (ret)
1035                 goto out;
1036
1037         if (conn_param)
1038                 qp_attr.max_rd_atomic = conn_param->initiator_depth;
1039         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
1040 out:
1041         mutex_unlock(&id_priv->qp_mutex);
1042         return ret;
1043 }
1044
1045 static int cma_modify_qp_err(struct rdma_id_private *id_priv)
1046 {
1047         struct ib_qp_attr qp_attr;
1048         int ret;
1049
1050         mutex_lock(&id_priv->qp_mutex);
1051         if (!id_priv->id.qp) {
1052                 ret = 0;
1053                 goto out;
1054         }
1055
1056         qp_attr.qp_state = IB_QPS_ERR;
1057         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, IB_QP_STATE);
1058 out:
1059         mutex_unlock(&id_priv->qp_mutex);
1060         return ret;
1061 }
1062
1063 static int cma_ib_init_qp_attr(struct rdma_id_private *id_priv,
1064                                struct ib_qp_attr *qp_attr, int *qp_attr_mask)
1065 {
1066         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
1067         int ret;
1068         u16 pkey;
1069
1070         if (rdma_cap_eth_ah(id_priv->id.device, id_priv->id.port_num))
1071                 pkey = 0xffff;
1072         else
1073                 pkey = ib_addr_get_pkey(dev_addr);
1074
1075         ret = ib_find_cached_pkey(id_priv->id.device, id_priv->id.port_num,
1076                                   pkey, &qp_attr->pkey_index);
1077         if (ret)
1078                 return ret;
1079
1080         qp_attr->port_num = id_priv->id.port_num;
1081         *qp_attr_mask = IB_QP_STATE | IB_QP_PKEY_INDEX | IB_QP_PORT;
1082
1083         if (id_priv->id.qp_type == IB_QPT_UD) {
1084                 ret = cma_set_qkey(id_priv, 0);
1085                 if (ret)
1086                         return ret;
1087
1088                 qp_attr->qkey = id_priv->qkey;
1089                 *qp_attr_mask |= IB_QP_QKEY;
1090         } else {
1091                 qp_attr->qp_access_flags = 0;
1092                 *qp_attr_mask |= IB_QP_ACCESS_FLAGS;
1093         }
1094         return 0;
1095 }
1096
1097 int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
1098                        int *qp_attr_mask)
1099 {
1100         struct rdma_id_private *id_priv;
1101         int ret = 0;
1102
1103         id_priv = container_of(id, struct rdma_id_private, id);
1104         if (rdma_cap_ib_cm(id->device, id->port_num)) {
1105                 if (!id_priv->cm_id.ib || (id_priv->id.qp_type == IB_QPT_UD))
1106                         ret = cma_ib_init_qp_attr(id_priv, qp_attr, qp_attr_mask);
1107                 else
1108                         ret = ib_cm_init_qp_attr(id_priv->cm_id.ib, qp_attr,
1109                                                  qp_attr_mask);
1110
1111                 if (qp_attr->qp_state == IB_QPS_RTR)
1112                         qp_attr->rq_psn = id_priv->seq_num;
1113         } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
1114                 if (!id_priv->cm_id.iw) {
1115                         qp_attr->qp_access_flags = 0;
1116                         *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS;
1117                 } else
1118                         ret = iw_cm_init_qp_attr(id_priv->cm_id.iw, qp_attr,
1119                                                  qp_attr_mask);
1120                 qp_attr->port_num = id_priv->id.port_num;
1121                 *qp_attr_mask |= IB_QP_PORT;
1122         } else
1123                 ret = -ENOSYS;
1124
1125         if ((*qp_attr_mask & IB_QP_TIMEOUT) && id_priv->timeout_set)
1126                 qp_attr->timeout = id_priv->timeout;
1127
1128         return ret;
1129 }
1130 EXPORT_SYMBOL(rdma_init_qp_attr);
1131
1132 static inline bool cma_zero_addr(const struct sockaddr *addr)
1133 {
1134         switch (addr->sa_family) {
1135         case AF_INET:
1136                 return ipv4_is_zeronet(((struct sockaddr_in *)addr)->sin_addr.s_addr);
1137         case AF_INET6:
1138                 return ipv6_addr_any(&((struct sockaddr_in6 *)addr)->sin6_addr);
1139         case AF_IB:
1140                 return ib_addr_any(&((struct sockaddr_ib *)addr)->sib_addr);
1141         default:
1142                 return false;
1143         }
1144 }
1145
1146 static inline bool cma_loopback_addr(const struct sockaddr *addr)
1147 {
1148         switch (addr->sa_family) {
1149         case AF_INET:
1150                 return ipv4_is_loopback(
1151                         ((struct sockaddr_in *)addr)->sin_addr.s_addr);
1152         case AF_INET6:
1153                 return ipv6_addr_loopback(
1154                         &((struct sockaddr_in6 *)addr)->sin6_addr);
1155         case AF_IB:
1156                 return ib_addr_loopback(
1157                         &((struct sockaddr_ib *)addr)->sib_addr);
1158         default:
1159                 return false;
1160         }
1161 }
1162
1163 static inline bool cma_any_addr(const struct sockaddr *addr)
1164 {
1165         return cma_zero_addr(addr) || cma_loopback_addr(addr);
1166 }
1167
1168 static int cma_addr_cmp(const struct sockaddr *src, const struct sockaddr *dst)
1169 {
1170         if (src->sa_family != dst->sa_family)
1171                 return -1;
1172
1173         switch (src->sa_family) {
1174         case AF_INET:
1175                 return ((struct sockaddr_in *)src)->sin_addr.s_addr !=
1176                        ((struct sockaddr_in *)dst)->sin_addr.s_addr;
1177         case AF_INET6: {
1178                 struct sockaddr_in6 *src_addr6 = (struct sockaddr_in6 *)src;
1179                 struct sockaddr_in6 *dst_addr6 = (struct sockaddr_in6 *)dst;
1180                 bool link_local;
1181
1182                 if (ipv6_addr_cmp(&src_addr6->sin6_addr,
1183                                           &dst_addr6->sin6_addr))
1184                         return 1;
1185                 link_local = ipv6_addr_type(&dst_addr6->sin6_addr) &
1186                              IPV6_ADDR_LINKLOCAL;
1187                 /* Link local must match their scope_ids */
1188                 return link_local ? (src_addr6->sin6_scope_id !=
1189                                      dst_addr6->sin6_scope_id) :
1190                                     0;
1191         }
1192
1193         default:
1194                 return ib_addr_cmp(&((struct sockaddr_ib *) src)->sib_addr,
1195                                    &((struct sockaddr_ib *) dst)->sib_addr);
1196         }
1197 }
1198
1199 static __be16 cma_port(const struct sockaddr *addr)
1200 {
1201         struct sockaddr_ib *sib;
1202
1203         switch (addr->sa_family) {
1204         case AF_INET:
1205                 return ((struct sockaddr_in *) addr)->sin_port;
1206         case AF_INET6:
1207                 return ((struct sockaddr_in6 *) addr)->sin6_port;
1208         case AF_IB:
1209                 sib = (struct sockaddr_ib *) addr;
1210                 return htons((u16) (be64_to_cpu(sib->sib_sid) &
1211                                     be64_to_cpu(sib->sib_sid_mask)));
1212         default:
1213                 return 0;
1214         }
1215 }
1216
1217 static inline int cma_any_port(const struct sockaddr *addr)
1218 {
1219         return !cma_port(addr);
1220 }
1221
1222 static void cma_save_ib_info(struct sockaddr *src_addr,
1223                              struct sockaddr *dst_addr,
1224                              const struct rdma_cm_id *listen_id,
1225                              const struct sa_path_rec *path)
1226 {
1227         struct sockaddr_ib *listen_ib, *ib;
1228
1229         listen_ib = (struct sockaddr_ib *) &listen_id->route.addr.src_addr;
1230         if (src_addr) {
1231                 ib = (struct sockaddr_ib *)src_addr;
1232                 ib->sib_family = AF_IB;
1233                 if (path) {
1234                         ib->sib_pkey = path->pkey;
1235                         ib->sib_flowinfo = path->flow_label;
1236                         memcpy(&ib->sib_addr, &path->sgid, 16);
1237                         ib->sib_sid = path->service_id;
1238                         ib->sib_scope_id = 0;
1239                 } else {
1240                         ib->sib_pkey = listen_ib->sib_pkey;
1241                         ib->sib_flowinfo = listen_ib->sib_flowinfo;
1242                         ib->sib_addr = listen_ib->sib_addr;
1243                         ib->sib_sid = listen_ib->sib_sid;
1244                         ib->sib_scope_id = listen_ib->sib_scope_id;
1245                 }
1246                 ib->sib_sid_mask = cpu_to_be64(0xffffffffffffffffULL);
1247         }
1248         if (dst_addr) {
1249                 ib = (struct sockaddr_ib *)dst_addr;
1250                 ib->sib_family = AF_IB;
1251                 if (path) {
1252                         ib->sib_pkey = path->pkey;
1253                         ib->sib_flowinfo = path->flow_label;
1254                         memcpy(&ib->sib_addr, &path->dgid, 16);
1255                 }
1256         }
1257 }
1258
1259 static void cma_save_ip4_info(struct sockaddr_in *src_addr,
1260                               struct sockaddr_in *dst_addr,
1261                               struct cma_hdr *hdr,
1262                               __be16 local_port)
1263 {
1264         if (src_addr) {
1265                 *src_addr = (struct sockaddr_in) {
1266                         .sin_family = AF_INET,
1267                         .sin_addr.s_addr = hdr->dst_addr.ip4.addr,
1268                         .sin_port = local_port,
1269                 };
1270         }
1271
1272         if (dst_addr) {
1273                 *dst_addr = (struct sockaddr_in) {
1274                         .sin_family = AF_INET,
1275                         .sin_addr.s_addr = hdr->src_addr.ip4.addr,
1276                         .sin_port = hdr->port,
1277                 };
1278         }
1279 }
1280
1281 static void cma_save_ip6_info(struct sockaddr_in6 *src_addr,
1282                               struct sockaddr_in6 *dst_addr,
1283                               struct cma_hdr *hdr,
1284                               __be16 local_port)
1285 {
1286         if (src_addr) {
1287                 *src_addr = (struct sockaddr_in6) {
1288                         .sin6_family = AF_INET6,
1289                         .sin6_addr = hdr->dst_addr.ip6,
1290                         .sin6_port = local_port,
1291                 };
1292         }
1293
1294         if (dst_addr) {
1295                 *dst_addr = (struct sockaddr_in6) {
1296                         .sin6_family = AF_INET6,
1297                         .sin6_addr = hdr->src_addr.ip6,
1298                         .sin6_port = hdr->port,
1299                 };
1300         }
1301 }
1302
1303 static u16 cma_port_from_service_id(__be64 service_id)
1304 {
1305         return (u16)be64_to_cpu(service_id);
1306 }
1307
1308 static int cma_save_ip_info(struct sockaddr *src_addr,
1309                             struct sockaddr *dst_addr,
1310                             const struct ib_cm_event *ib_event,
1311                             __be64 service_id)
1312 {
1313         struct cma_hdr *hdr;
1314         __be16 port;
1315
1316         hdr = ib_event->private_data;
1317         if (hdr->cma_version != CMA_VERSION)
1318                 return -EINVAL;
1319
1320         port = htons(cma_port_from_service_id(service_id));
1321
1322         switch (cma_get_ip_ver(hdr)) {
1323         case 4:
1324                 cma_save_ip4_info((struct sockaddr_in *)src_addr,
1325                                   (struct sockaddr_in *)dst_addr, hdr, port);
1326                 break;
1327         case 6:
1328                 cma_save_ip6_info((struct sockaddr_in6 *)src_addr,
1329                                   (struct sockaddr_in6 *)dst_addr, hdr, port);
1330                 break;
1331         default:
1332                 return -EAFNOSUPPORT;
1333         }
1334
1335         return 0;
1336 }
1337
1338 static int cma_save_net_info(struct sockaddr *src_addr,
1339                              struct sockaddr *dst_addr,
1340                              const struct rdma_cm_id *listen_id,
1341                              const struct ib_cm_event *ib_event,
1342                              sa_family_t sa_family, __be64 service_id)
1343 {
1344         if (sa_family == AF_IB) {
1345                 if (ib_event->event == IB_CM_REQ_RECEIVED)
1346                         cma_save_ib_info(src_addr, dst_addr, listen_id,
1347                                          ib_event->param.req_rcvd.primary_path);
1348                 else if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED)
1349                         cma_save_ib_info(src_addr, dst_addr, listen_id, NULL);
1350                 return 0;
1351         }
1352
1353         return cma_save_ip_info(src_addr, dst_addr, ib_event, service_id);
1354 }
1355
1356 static int cma_save_req_info(const struct ib_cm_event *ib_event,
1357                              struct cma_req_info *req)
1358 {
1359         const struct ib_cm_req_event_param *req_param =
1360                 &ib_event->param.req_rcvd;
1361         const struct ib_cm_sidr_req_event_param *sidr_param =
1362                 &ib_event->param.sidr_req_rcvd;
1363
1364         switch (ib_event->event) {
1365         case IB_CM_REQ_RECEIVED:
1366                 req->device     = req_param->listen_id->device;
1367                 req->port       = req_param->port;
1368                 memcpy(&req->local_gid, &req_param->primary_path->sgid,
1369                        sizeof(req->local_gid));
1370                 req->has_gid    = true;
1371                 req->service_id = req_param->primary_path->service_id;
1372                 req->pkey       = be16_to_cpu(req_param->primary_path->pkey);
1373                 if (req->pkey != req_param->bth_pkey)
1374                         pr_warn_ratelimited("RDMA CMA: got different BTH P_Key (0x%x) and primary path P_Key (0x%x)\n"
1375                                             "RDMA CMA: in the future this may cause the request to be dropped\n",
1376                                             req_param->bth_pkey, req->pkey);
1377                 break;
1378         case IB_CM_SIDR_REQ_RECEIVED:
1379                 req->device     = sidr_param->listen_id->device;
1380                 req->port       = sidr_param->port;
1381                 req->has_gid    = false;
1382                 req->service_id = sidr_param->service_id;
1383                 req->pkey       = sidr_param->pkey;
1384                 if (req->pkey != sidr_param->bth_pkey)
1385                         pr_warn_ratelimited("RDMA CMA: got different BTH P_Key (0x%x) and SIDR request payload P_Key (0x%x)\n"
1386                                             "RDMA CMA: in the future this may cause the request to be dropped\n",
1387                                             sidr_param->bth_pkey, req->pkey);
1388                 break;
1389         default:
1390                 return -EINVAL;
1391         }
1392
1393         return 0;
1394 }
1395
1396 static bool validate_ipv4_net_dev(struct net_device *net_dev,
1397                                   const struct sockaddr_in *dst_addr,
1398                                   const struct sockaddr_in *src_addr)
1399 {
1400         __be32 daddr = dst_addr->sin_addr.s_addr,
1401                saddr = src_addr->sin_addr.s_addr;
1402         struct fib_result res;
1403         struct flowi4 fl4;
1404         int err;
1405         bool ret;
1406
1407         if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) ||
1408             ipv4_is_lbcast(daddr) || ipv4_is_zeronet(saddr) ||
1409             ipv4_is_zeronet(daddr) || ipv4_is_loopback(daddr) ||
1410             ipv4_is_loopback(saddr))
1411                 return false;
1412
1413         memset(&fl4, 0, sizeof(fl4));
1414         fl4.flowi4_iif = net_dev->ifindex;
1415         fl4.daddr = daddr;
1416         fl4.saddr = saddr;
1417
1418         rcu_read_lock();
1419         err = fib_lookup(dev_net(net_dev), &fl4, &res, 0);
1420         ret = err == 0 && FIB_RES_DEV(res) == net_dev;
1421         rcu_read_unlock();
1422
1423         return ret;
1424 }
1425
1426 static bool validate_ipv6_net_dev(struct net_device *net_dev,
1427                                   const struct sockaddr_in6 *dst_addr,
1428                                   const struct sockaddr_in6 *src_addr)
1429 {
1430 #if IS_ENABLED(CONFIG_IPV6)
1431         const int strict = ipv6_addr_type(&dst_addr->sin6_addr) &
1432                            IPV6_ADDR_LINKLOCAL;
1433         struct rt6_info *rt = rt6_lookup(dev_net(net_dev), &dst_addr->sin6_addr,
1434                                          &src_addr->sin6_addr, net_dev->ifindex,
1435                                          NULL, strict);
1436         bool ret;
1437
1438         if (!rt)
1439                 return false;
1440
1441         ret = rt->rt6i_idev->dev == net_dev;
1442         ip6_rt_put(rt);
1443
1444         return ret;
1445 #else
1446         return false;
1447 #endif
1448 }
1449
1450 static bool validate_net_dev(struct net_device *net_dev,
1451                              const struct sockaddr *daddr,
1452                              const struct sockaddr *saddr)
1453 {
1454         const struct sockaddr_in *daddr4 = (const struct sockaddr_in *)daddr;
1455         const struct sockaddr_in *saddr4 = (const struct sockaddr_in *)saddr;
1456         const struct sockaddr_in6 *daddr6 = (const struct sockaddr_in6 *)daddr;
1457         const struct sockaddr_in6 *saddr6 = (const struct sockaddr_in6 *)saddr;
1458
1459         switch (daddr->sa_family) {
1460         case AF_INET:
1461                 return saddr->sa_family == AF_INET &&
1462                        validate_ipv4_net_dev(net_dev, daddr4, saddr4);
1463
1464         case AF_INET6:
1465                 return saddr->sa_family == AF_INET6 &&
1466                        validate_ipv6_net_dev(net_dev, daddr6, saddr6);
1467
1468         default:
1469                 return false;
1470         }
1471 }
1472
1473 static struct net_device *
1474 roce_get_net_dev_by_cm_event(const struct ib_cm_event *ib_event)
1475 {
1476         const struct ib_gid_attr *sgid_attr = NULL;
1477         struct net_device *ndev;
1478
1479         if (ib_event->event == IB_CM_REQ_RECEIVED)
1480                 sgid_attr = ib_event->param.req_rcvd.ppath_sgid_attr;
1481         else if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED)
1482                 sgid_attr = ib_event->param.sidr_req_rcvd.sgid_attr;
1483
1484         if (!sgid_attr)
1485                 return NULL;
1486
1487         rcu_read_lock();
1488         ndev = rdma_read_gid_attr_ndev_rcu(sgid_attr);
1489         if (IS_ERR(ndev))
1490                 ndev = NULL;
1491         else
1492                 dev_hold(ndev);
1493         rcu_read_unlock();
1494         return ndev;
1495 }
1496
1497 static struct net_device *cma_get_net_dev(const struct ib_cm_event *ib_event,
1498                                           struct cma_req_info *req)
1499 {
1500         struct sockaddr *listen_addr =
1501                         (struct sockaddr *)&req->listen_addr_storage;
1502         struct sockaddr *src_addr = (struct sockaddr *)&req->src_addr_storage;
1503         struct net_device *net_dev;
1504         const union ib_gid *gid = req->has_gid ? &req->local_gid : NULL;
1505         int err;
1506
1507         err = cma_save_ip_info(listen_addr, src_addr, ib_event,
1508                                req->service_id);
1509         if (err)
1510                 return ERR_PTR(err);
1511
1512         if (rdma_protocol_roce(req->device, req->port))
1513                 net_dev = roce_get_net_dev_by_cm_event(ib_event);
1514         else
1515                 net_dev = ib_get_net_dev_by_params(req->device, req->port,
1516                                                    req->pkey,
1517                                                    gid, listen_addr);
1518         if (!net_dev)
1519                 return ERR_PTR(-ENODEV);
1520
1521         return net_dev;
1522 }
1523
1524 static enum rdma_ucm_port_space rdma_ps_from_service_id(__be64 service_id)
1525 {
1526         return (be64_to_cpu(service_id) >> 16) & 0xffff;
1527 }
1528
1529 static bool cma_match_private_data(struct rdma_id_private *id_priv,
1530                                    const struct cma_hdr *hdr)
1531 {
1532         struct sockaddr *addr = cma_src_addr(id_priv);
1533         __be32 ip4_addr;
1534         struct in6_addr ip6_addr;
1535
1536         if (cma_any_addr(addr) && !id_priv->afonly)
1537                 return true;
1538
1539         switch (addr->sa_family) {
1540         case AF_INET:
1541                 ip4_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
1542                 if (cma_get_ip_ver(hdr) != 4)
1543                         return false;
1544                 if (!cma_any_addr(addr) &&
1545                     hdr->dst_addr.ip4.addr != ip4_addr)
1546                         return false;
1547                 break;
1548         case AF_INET6:
1549                 ip6_addr = ((struct sockaddr_in6 *)addr)->sin6_addr;
1550                 if (cma_get_ip_ver(hdr) != 6)
1551                         return false;
1552                 if (!cma_any_addr(addr) &&
1553                     memcmp(&hdr->dst_addr.ip6, &ip6_addr, sizeof(ip6_addr)))
1554                         return false;
1555                 break;
1556         case AF_IB:
1557                 return true;
1558         default:
1559                 return false;
1560         }
1561
1562         return true;
1563 }
1564
1565 static bool cma_protocol_roce(const struct rdma_cm_id *id)
1566 {
1567         struct ib_device *device = id->device;
1568         const int port_num = id->port_num ?: rdma_start_port(device);
1569
1570         return rdma_protocol_roce(device, port_num);
1571 }
1572
1573 static bool cma_is_req_ipv6_ll(const struct cma_req_info *req)
1574 {
1575         const struct sockaddr *daddr =
1576                         (const struct sockaddr *)&req->listen_addr_storage;
1577         const struct sockaddr_in6 *daddr6 = (const struct sockaddr_in6 *)daddr;
1578
1579         /* Returns true if the req is for IPv6 link local */
1580         return (daddr->sa_family == AF_INET6 &&
1581                 (ipv6_addr_type(&daddr6->sin6_addr) & IPV6_ADDR_LINKLOCAL));
1582 }
1583
1584 static bool cma_match_net_dev(const struct rdma_cm_id *id,
1585                               const struct net_device *net_dev,
1586                               const struct cma_req_info *req)
1587 {
1588         const struct rdma_addr *addr = &id->route.addr;
1589
1590         if (!net_dev)
1591                 /* This request is an AF_IB request */
1592                 return (!id->port_num || id->port_num == req->port) &&
1593                        (addr->src_addr.ss_family == AF_IB);
1594
1595         /*
1596          * If the request is not for IPv6 link local, allow matching
1597          * request to any netdevice of the one or multiport rdma device.
1598          */
1599         if (!cma_is_req_ipv6_ll(req))
1600                 return true;
1601         /*
1602          * Net namespaces must match, and if the listner is listening
1603          * on a specific netdevice than netdevice must match as well.
1604          */
1605         if (net_eq(dev_net(net_dev), addr->dev_addr.net) &&
1606             (!!addr->dev_addr.bound_dev_if ==
1607              (addr->dev_addr.bound_dev_if == net_dev->ifindex)))
1608                 return true;
1609         else
1610                 return false;
1611 }
1612
1613 static struct rdma_id_private *cma_find_listener(
1614                 const struct rdma_bind_list *bind_list,
1615                 const struct ib_cm_id *cm_id,
1616                 const struct ib_cm_event *ib_event,
1617                 const struct cma_req_info *req,
1618                 const struct net_device *net_dev)
1619 {
1620         struct rdma_id_private *id_priv, *id_priv_dev;
1621
1622         if (!bind_list)
1623                 return ERR_PTR(-EINVAL);
1624
1625         hlist_for_each_entry(id_priv, &bind_list->owners, node) {
1626                 if (cma_match_private_data(id_priv, ib_event->private_data)) {
1627                         if (id_priv->id.device == cm_id->device &&
1628                             cma_match_net_dev(&id_priv->id, net_dev, req))
1629                                 return id_priv;
1630                         list_for_each_entry(id_priv_dev,
1631                                             &id_priv->listen_list,
1632                                             listen_list) {
1633                                 if (id_priv_dev->id.device == cm_id->device &&
1634                                     cma_match_net_dev(&id_priv_dev->id,
1635                                                       net_dev, req))
1636                                         return id_priv_dev;
1637                         }
1638                 }
1639         }
1640
1641         return ERR_PTR(-EINVAL);
1642 }
1643
1644 static struct rdma_id_private *
1645 cma_ib_id_from_event(struct ib_cm_id *cm_id,
1646                      const struct ib_cm_event *ib_event,
1647                      struct cma_req_info *req,
1648                      struct net_device **net_dev)
1649 {
1650         struct rdma_bind_list *bind_list;
1651         struct rdma_id_private *id_priv;
1652         int err;
1653
1654         err = cma_save_req_info(ib_event, req);
1655         if (err)
1656                 return ERR_PTR(err);
1657
1658         *net_dev = cma_get_net_dev(ib_event, req);
1659         if (IS_ERR(*net_dev)) {
1660                 if (PTR_ERR(*net_dev) == -EAFNOSUPPORT) {
1661                         /* Assuming the protocol is AF_IB */
1662                         *net_dev = NULL;
1663                 } else {
1664                         return ERR_CAST(*net_dev);
1665                 }
1666         }
1667
1668         /*
1669          * Net namespace might be getting deleted while route lookup,
1670          * cm_id lookup is in progress. Therefore, perform netdevice
1671          * validation, cm_id lookup under rcu lock.
1672          * RCU lock along with netdevice state check, synchronizes with
1673          * netdevice migrating to different net namespace and also avoids
1674          * case where net namespace doesn't get deleted while lookup is in
1675          * progress.
1676          * If the device state is not IFF_UP, its properties such as ifindex
1677          * and nd_net cannot be trusted to remain valid without rcu lock.
1678          * net/core/dev.c change_net_namespace() ensures to synchronize with
1679          * ongoing operations on net device after device is closed using
1680          * synchronize_net().
1681          */
1682         rcu_read_lock();
1683         if (*net_dev) {
1684                 /*
1685                  * If netdevice is down, it is likely that it is administratively
1686                  * down or it might be migrating to different namespace.
1687                  * In that case avoid further processing, as the net namespace
1688                  * or ifindex may change.
1689                  */
1690                 if (((*net_dev)->flags & IFF_UP) == 0) {
1691                         id_priv = ERR_PTR(-EHOSTUNREACH);
1692                         goto err;
1693                 }
1694
1695                 if (!validate_net_dev(*net_dev,
1696                                  (struct sockaddr *)&req->listen_addr_storage,
1697                                  (struct sockaddr *)&req->src_addr_storage)) {
1698                         id_priv = ERR_PTR(-EHOSTUNREACH);
1699                         goto err;
1700                 }
1701         }
1702
1703         bind_list = cma_ps_find(*net_dev ? dev_net(*net_dev) : &init_net,
1704                                 rdma_ps_from_service_id(req->service_id),
1705                                 cma_port_from_service_id(req->service_id));
1706         id_priv = cma_find_listener(bind_list, cm_id, ib_event, req, *net_dev);
1707 err:
1708         rcu_read_unlock();
1709         if (IS_ERR(id_priv) && *net_dev) {
1710                 dev_put(*net_dev);
1711                 *net_dev = NULL;
1712         }
1713         return id_priv;
1714 }
1715
1716 static inline u8 cma_user_data_offset(struct rdma_id_private *id_priv)
1717 {
1718         return cma_family(id_priv) == AF_IB ? 0 : sizeof(struct cma_hdr);
1719 }
1720
1721 static void cma_cancel_route(struct rdma_id_private *id_priv)
1722 {
1723         if (rdma_cap_ib_sa(id_priv->id.device, id_priv->id.port_num)) {
1724                 if (id_priv->query)
1725                         ib_sa_cancel_query(id_priv->query_id, id_priv->query);
1726         }
1727 }
1728
1729 static void cma_cancel_listens(struct rdma_id_private *id_priv)
1730 {
1731         struct rdma_id_private *dev_id_priv;
1732
1733         /*
1734          * Remove from listen_any_list to prevent added devices from spawning
1735          * additional listen requests.
1736          */
1737         mutex_lock(&lock);
1738         list_del(&id_priv->list);
1739
1740         while (!list_empty(&id_priv->listen_list)) {
1741                 dev_id_priv = list_entry(id_priv->listen_list.next,
1742                                          struct rdma_id_private, listen_list);
1743                 /* sync with device removal to avoid duplicate destruction */
1744                 list_del_init(&dev_id_priv->list);
1745                 list_del(&dev_id_priv->listen_list);
1746                 mutex_unlock(&lock);
1747
1748                 rdma_destroy_id(&dev_id_priv->id);
1749                 mutex_lock(&lock);
1750         }
1751         mutex_unlock(&lock);
1752 }
1753
1754 static void cma_cancel_operation(struct rdma_id_private *id_priv,
1755                                  enum rdma_cm_state state)
1756 {
1757         switch (state) {
1758         case RDMA_CM_ADDR_QUERY:
1759                 rdma_addr_cancel(&id_priv->id.route.addr.dev_addr);
1760                 break;
1761         case RDMA_CM_ROUTE_QUERY:
1762                 cma_cancel_route(id_priv);
1763                 break;
1764         case RDMA_CM_LISTEN:
1765                 if (cma_any_addr(cma_src_addr(id_priv)) && !id_priv->cma_dev)
1766                         cma_cancel_listens(id_priv);
1767                 break;
1768         default:
1769                 break;
1770         }
1771 }
1772
1773 static void cma_release_port(struct rdma_id_private *id_priv)
1774 {
1775         struct rdma_bind_list *bind_list = id_priv->bind_list;
1776         struct net *net = id_priv->id.route.addr.dev_addr.net;
1777
1778         if (!bind_list)
1779                 return;
1780
1781         mutex_lock(&lock);
1782         hlist_del(&id_priv->node);
1783         if (hlist_empty(&bind_list->owners)) {
1784                 cma_ps_remove(net, bind_list->ps, bind_list->port);
1785                 kfree(bind_list);
1786         }
1787         mutex_unlock(&lock);
1788 }
1789
1790 static void cma_leave_roce_mc_group(struct rdma_id_private *id_priv,
1791                                     struct cma_multicast *mc)
1792 {
1793         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
1794         struct net_device *ndev = NULL;
1795
1796         if (dev_addr->bound_dev_if)
1797                 ndev = dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if);
1798         if (ndev) {
1799                 cma_igmp_send(ndev, &mc->multicast.ib->rec.mgid, false);
1800                 dev_put(ndev);
1801         }
1802         kref_put(&mc->mcref, release_mc);
1803 }
1804
1805 static void cma_leave_mc_groups(struct rdma_id_private *id_priv)
1806 {
1807         struct cma_multicast *mc;
1808
1809         while (!list_empty(&id_priv->mc_list)) {
1810                 mc = container_of(id_priv->mc_list.next,
1811                                   struct cma_multicast, list);
1812                 list_del(&mc->list);
1813                 if (rdma_cap_ib_mcast(id_priv->cma_dev->device,
1814                                       id_priv->id.port_num)) {
1815                         ib_sa_free_multicast(mc->multicast.ib);
1816                         kfree(mc);
1817                 } else {
1818                         cma_leave_roce_mc_group(id_priv, mc);
1819                 }
1820         }
1821 }
1822
1823 void rdma_destroy_id(struct rdma_cm_id *id)
1824 {
1825         struct rdma_id_private *id_priv;
1826         enum rdma_cm_state state;
1827
1828         id_priv = container_of(id, struct rdma_id_private, id);
1829         trace_cm_id_destroy(id_priv);
1830         state = cma_exch(id_priv, RDMA_CM_DESTROYING);
1831         cma_cancel_operation(id_priv, state);
1832
1833         /*
1834          * Wait for any active callback to finish.  New callbacks will find
1835          * the id_priv state set to destroying and abort.
1836          */
1837         mutex_lock(&id_priv->handler_mutex);
1838         mutex_unlock(&id_priv->handler_mutex);
1839
1840         rdma_restrack_del(&id_priv->res);
1841         if (id_priv->cma_dev) {
1842                 if (rdma_cap_ib_cm(id_priv->id.device, 1)) {
1843                         if (id_priv->cm_id.ib)
1844                                 ib_destroy_cm_id(id_priv->cm_id.ib);
1845                 } else if (rdma_cap_iw_cm(id_priv->id.device, 1)) {
1846                         if (id_priv->cm_id.iw)
1847                                 iw_destroy_cm_id(id_priv->cm_id.iw);
1848                 }
1849                 cma_leave_mc_groups(id_priv);
1850                 cma_release_dev(id_priv);
1851         }
1852
1853         cma_release_port(id_priv);
1854         cma_id_put(id_priv);
1855         wait_for_completion(&id_priv->comp);
1856
1857         if (id_priv->internal_id)
1858                 cma_id_put(id_priv->id.context);
1859
1860         kfree(id_priv->id.route.path_rec);
1861
1862         if (id_priv->id.route.addr.dev_addr.sgid_attr)
1863                 rdma_put_gid_attr(id_priv->id.route.addr.dev_addr.sgid_attr);
1864
1865         put_net(id_priv->id.route.addr.dev_addr.net);
1866         kfree(id_priv);
1867 }
1868 EXPORT_SYMBOL(rdma_destroy_id);
1869
1870 static int cma_rep_recv(struct rdma_id_private *id_priv)
1871 {
1872         int ret;
1873
1874         ret = cma_modify_qp_rtr(id_priv, NULL);
1875         if (ret)
1876                 goto reject;
1877
1878         ret = cma_modify_qp_rts(id_priv, NULL);
1879         if (ret)
1880                 goto reject;
1881
1882         trace_cm_send_rtu(id_priv);
1883         ret = ib_send_cm_rtu(id_priv->cm_id.ib, NULL, 0);
1884         if (ret)
1885                 goto reject;
1886
1887         return 0;
1888 reject:
1889         pr_debug_ratelimited("RDMA CM: CONNECT_ERROR: failed to handle reply. status %d\n", ret);
1890         cma_modify_qp_err(id_priv);
1891         trace_cm_send_rej(id_priv);
1892         ib_send_cm_rej(id_priv->cm_id.ib, IB_CM_REJ_CONSUMER_DEFINED,
1893                        NULL, 0, NULL, 0);
1894         return ret;
1895 }
1896
1897 static void cma_set_rep_event_data(struct rdma_cm_event *event,
1898                                    const struct ib_cm_rep_event_param *rep_data,
1899                                    void *private_data)
1900 {
1901         event->param.conn.private_data = private_data;
1902         event->param.conn.private_data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
1903         event->param.conn.responder_resources = rep_data->responder_resources;
1904         event->param.conn.initiator_depth = rep_data->initiator_depth;
1905         event->param.conn.flow_control = rep_data->flow_control;
1906         event->param.conn.rnr_retry_count = rep_data->rnr_retry_count;
1907         event->param.conn.srq = rep_data->srq;
1908         event->param.conn.qp_num = rep_data->remote_qpn;
1909 }
1910
1911 static int cma_cm_event_handler(struct rdma_id_private *id_priv,
1912                                 struct rdma_cm_event *event)
1913 {
1914         int ret;
1915
1916         trace_cm_event_handler(id_priv, event);
1917         ret = id_priv->id.event_handler(&id_priv->id, event);
1918         trace_cm_event_done(id_priv, event, ret);
1919         return ret;
1920 }
1921
1922 static int cma_ib_handler(struct ib_cm_id *cm_id,
1923                           const struct ib_cm_event *ib_event)
1924 {
1925         struct rdma_id_private *id_priv = cm_id->context;
1926         struct rdma_cm_event event = {};
1927         int ret = 0;
1928
1929         mutex_lock(&id_priv->handler_mutex);
1930         if ((ib_event->event != IB_CM_TIMEWAIT_EXIT &&
1931              id_priv->state != RDMA_CM_CONNECT) ||
1932             (ib_event->event == IB_CM_TIMEWAIT_EXIT &&
1933              id_priv->state != RDMA_CM_DISCONNECT))
1934                 goto out;
1935
1936         switch (ib_event->event) {
1937         case IB_CM_REQ_ERROR:
1938         case IB_CM_REP_ERROR:
1939                 event.event = RDMA_CM_EVENT_UNREACHABLE;
1940                 event.status = -ETIMEDOUT;
1941                 break;
1942         case IB_CM_REP_RECEIVED:
1943                 if (cma_comp(id_priv, RDMA_CM_CONNECT) &&
1944                     (id_priv->id.qp_type != IB_QPT_UD)) {
1945                         trace_cm_send_mra(id_priv);
1946                         ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
1947                 }
1948                 if (id_priv->id.qp) {
1949                         event.status = cma_rep_recv(id_priv);
1950                         event.event = event.status ? RDMA_CM_EVENT_CONNECT_ERROR :
1951                                                      RDMA_CM_EVENT_ESTABLISHED;
1952                 } else {
1953                         event.event = RDMA_CM_EVENT_CONNECT_RESPONSE;
1954                 }
1955                 cma_set_rep_event_data(&event, &ib_event->param.rep_rcvd,
1956                                        ib_event->private_data);
1957                 break;
1958         case IB_CM_RTU_RECEIVED:
1959         case IB_CM_USER_ESTABLISHED:
1960                 event.event = RDMA_CM_EVENT_ESTABLISHED;
1961                 break;
1962         case IB_CM_DREQ_ERROR:
1963                 event.status = -ETIMEDOUT; /* fall through */
1964         case IB_CM_DREQ_RECEIVED:
1965         case IB_CM_DREP_RECEIVED:
1966                 if (!cma_comp_exch(id_priv, RDMA_CM_CONNECT,
1967                                    RDMA_CM_DISCONNECT))
1968                         goto out;
1969                 event.event = RDMA_CM_EVENT_DISCONNECTED;
1970                 break;
1971         case IB_CM_TIMEWAIT_EXIT:
1972                 event.event = RDMA_CM_EVENT_TIMEWAIT_EXIT;
1973                 break;
1974         case IB_CM_MRA_RECEIVED:
1975                 /* ignore event */
1976                 goto out;
1977         case IB_CM_REJ_RECEIVED:
1978                 pr_debug_ratelimited("RDMA CM: REJECTED: %s\n", rdma_reject_msg(&id_priv->id,
1979                                                                                 ib_event->param.rej_rcvd.reason));
1980                 cma_modify_qp_err(id_priv);
1981                 event.status = ib_event->param.rej_rcvd.reason;
1982                 event.event = RDMA_CM_EVENT_REJECTED;
1983                 event.param.conn.private_data = ib_event->private_data;
1984                 event.param.conn.private_data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
1985                 break;
1986         default:
1987                 pr_err("RDMA CMA: unexpected IB CM event: %d\n",
1988                        ib_event->event);
1989                 goto out;
1990         }
1991
1992         ret = cma_cm_event_handler(id_priv, &event);
1993         if (ret) {
1994                 /* Destroy the CM ID by returning a non-zero value. */
1995                 id_priv->cm_id.ib = NULL;
1996                 cma_exch(id_priv, RDMA_CM_DESTROYING);
1997                 mutex_unlock(&id_priv->handler_mutex);
1998                 rdma_destroy_id(&id_priv->id);
1999                 return ret;
2000         }
2001 out:
2002         mutex_unlock(&id_priv->handler_mutex);
2003         return ret;
2004 }
2005
2006 static struct rdma_id_private *
2007 cma_ib_new_conn_id(const struct rdma_cm_id *listen_id,
2008                    const struct ib_cm_event *ib_event,
2009                    struct net_device *net_dev)
2010 {
2011         struct rdma_id_private *listen_id_priv;
2012         struct rdma_id_private *id_priv;
2013         struct rdma_cm_id *id;
2014         struct rdma_route *rt;
2015         const sa_family_t ss_family = listen_id->route.addr.src_addr.ss_family;
2016         struct sa_path_rec *path = ib_event->param.req_rcvd.primary_path;
2017         const __be64 service_id =
2018                 ib_event->param.req_rcvd.primary_path->service_id;
2019         int ret;
2020
2021         listen_id_priv = container_of(listen_id, struct rdma_id_private, id);
2022         id = __rdma_create_id(listen_id->route.addr.dev_addr.net,
2023                             listen_id->event_handler, listen_id->context,
2024                             listen_id->ps, ib_event->param.req_rcvd.qp_type,
2025                             listen_id_priv->res.kern_name);
2026         if (IS_ERR(id))
2027                 return NULL;
2028
2029         id_priv = container_of(id, struct rdma_id_private, id);
2030         if (cma_save_net_info((struct sockaddr *)&id->route.addr.src_addr,
2031                               (struct sockaddr *)&id->route.addr.dst_addr,
2032                               listen_id, ib_event, ss_family, service_id))
2033                 goto err;
2034
2035         rt = &id->route;
2036         rt->num_paths = ib_event->param.req_rcvd.alternate_path ? 2 : 1;
2037         rt->path_rec = kmalloc_array(rt->num_paths, sizeof(*rt->path_rec),
2038                                      GFP_KERNEL);
2039         if (!rt->path_rec)
2040                 goto err;
2041
2042         rt->path_rec[0] = *path;
2043         if (rt->num_paths == 2)
2044                 rt->path_rec[1] = *ib_event->param.req_rcvd.alternate_path;
2045
2046         if (net_dev) {
2047                 rdma_copy_src_l2_addr(&rt->addr.dev_addr, net_dev);
2048         } else {
2049                 if (!cma_protocol_roce(listen_id) &&
2050                     cma_any_addr(cma_src_addr(id_priv))) {
2051                         rt->addr.dev_addr.dev_type = ARPHRD_INFINIBAND;
2052                         rdma_addr_set_sgid(&rt->addr.dev_addr, &rt->path_rec[0].sgid);
2053                         ib_addr_set_pkey(&rt->addr.dev_addr, be16_to_cpu(rt->path_rec[0].pkey));
2054                 } else if (!cma_any_addr(cma_src_addr(id_priv))) {
2055                         ret = cma_translate_addr(cma_src_addr(id_priv), &rt->addr.dev_addr);
2056                         if (ret)
2057                                 goto err;
2058                 }
2059         }
2060         rdma_addr_set_dgid(&rt->addr.dev_addr, &rt->path_rec[0].dgid);
2061
2062         id_priv->state = RDMA_CM_CONNECT;
2063         return id_priv;
2064
2065 err:
2066         rdma_destroy_id(id);
2067         return NULL;
2068 }
2069
2070 static struct rdma_id_private *
2071 cma_ib_new_udp_id(const struct rdma_cm_id *listen_id,
2072                   const struct ib_cm_event *ib_event,
2073                   struct net_device *net_dev)
2074 {
2075         const struct rdma_id_private *listen_id_priv;
2076         struct rdma_id_private *id_priv;
2077         struct rdma_cm_id *id;
2078         const sa_family_t ss_family = listen_id->route.addr.src_addr.ss_family;
2079         struct net *net = listen_id->route.addr.dev_addr.net;
2080         int ret;
2081
2082         listen_id_priv = container_of(listen_id, struct rdma_id_private, id);
2083         id = __rdma_create_id(net, listen_id->event_handler, listen_id->context,
2084                               listen_id->ps, IB_QPT_UD,
2085                               listen_id_priv->res.kern_name);
2086         if (IS_ERR(id))
2087                 return NULL;
2088
2089         id_priv = container_of(id, struct rdma_id_private, id);
2090         if (cma_save_net_info((struct sockaddr *)&id->route.addr.src_addr,
2091                               (struct sockaddr *)&id->route.addr.dst_addr,
2092                               listen_id, ib_event, ss_family,
2093                               ib_event->param.sidr_req_rcvd.service_id))
2094                 goto err;
2095
2096         if (net_dev) {
2097                 rdma_copy_src_l2_addr(&id->route.addr.dev_addr, net_dev);
2098         } else {
2099                 if (!cma_any_addr(cma_src_addr(id_priv))) {
2100                         ret = cma_translate_addr(cma_src_addr(id_priv),
2101                                                  &id->route.addr.dev_addr);
2102                         if (ret)
2103                                 goto err;
2104                 }
2105         }
2106
2107         id_priv->state = RDMA_CM_CONNECT;
2108         return id_priv;
2109 err:
2110         rdma_destroy_id(id);
2111         return NULL;
2112 }
2113
2114 static void cma_set_req_event_data(struct rdma_cm_event *event,
2115                                    const struct ib_cm_req_event_param *req_data,
2116                                    void *private_data, int offset)
2117 {
2118         event->param.conn.private_data = private_data + offset;
2119         event->param.conn.private_data_len = IB_CM_REQ_PRIVATE_DATA_SIZE - offset;
2120         event->param.conn.responder_resources = req_data->responder_resources;
2121         event->param.conn.initiator_depth = req_data->initiator_depth;
2122         event->param.conn.flow_control = req_data->flow_control;
2123         event->param.conn.retry_count = req_data->retry_count;
2124         event->param.conn.rnr_retry_count = req_data->rnr_retry_count;
2125         event->param.conn.srq = req_data->srq;
2126         event->param.conn.qp_num = req_data->remote_qpn;
2127 }
2128
2129 static int cma_ib_check_req_qp_type(const struct rdma_cm_id *id,
2130                                     const struct ib_cm_event *ib_event)
2131 {
2132         return (((ib_event->event == IB_CM_REQ_RECEIVED) &&
2133                  (ib_event->param.req_rcvd.qp_type == id->qp_type)) ||
2134                 ((ib_event->event == IB_CM_SIDR_REQ_RECEIVED) &&
2135                  (id->qp_type == IB_QPT_UD)) ||
2136                 (!id->qp_type));
2137 }
2138
2139 static int cma_ib_req_handler(struct ib_cm_id *cm_id,
2140                               const struct ib_cm_event *ib_event)
2141 {
2142         struct rdma_id_private *listen_id, *conn_id = NULL;
2143         struct rdma_cm_event event = {};
2144         struct cma_req_info req = {};
2145         struct net_device *net_dev;
2146         u8 offset;
2147         int ret;
2148
2149         listen_id = cma_ib_id_from_event(cm_id, ib_event, &req, &net_dev);
2150         if (IS_ERR(listen_id))
2151                 return PTR_ERR(listen_id);
2152
2153         trace_cm_req_handler(listen_id, ib_event->event);
2154         if (!cma_ib_check_req_qp_type(&listen_id->id, ib_event)) {
2155                 ret = -EINVAL;
2156                 goto net_dev_put;
2157         }
2158
2159         mutex_lock(&listen_id->handler_mutex);
2160         if (listen_id->state != RDMA_CM_LISTEN) {
2161                 ret = -ECONNABORTED;
2162                 goto err1;
2163         }
2164
2165         offset = cma_user_data_offset(listen_id);
2166         event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
2167         if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED) {
2168                 conn_id = cma_ib_new_udp_id(&listen_id->id, ib_event, net_dev);
2169                 event.param.ud.private_data = ib_event->private_data + offset;
2170                 event.param.ud.private_data_len =
2171                                 IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE - offset;
2172         } else {
2173                 conn_id = cma_ib_new_conn_id(&listen_id->id, ib_event, net_dev);
2174                 cma_set_req_event_data(&event, &ib_event->param.req_rcvd,
2175                                        ib_event->private_data, offset);
2176         }
2177         if (!conn_id) {
2178                 ret = -ENOMEM;
2179                 goto err1;
2180         }
2181
2182         mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
2183         ret = cma_ib_acquire_dev(conn_id, listen_id, &req);
2184         if (ret)
2185                 goto err2;
2186
2187         conn_id->cm_id.ib = cm_id;
2188         cm_id->context = conn_id;
2189         cm_id->cm_handler = cma_ib_handler;
2190
2191         /*
2192          * Protect against the user destroying conn_id from another thread
2193          * until we're done accessing it.
2194          */
2195         cma_id_get(conn_id);
2196         ret = cma_cm_event_handler(conn_id, &event);
2197         if (ret)
2198                 goto err3;
2199         /*
2200          * Acquire mutex to prevent user executing rdma_destroy_id()
2201          * while we're accessing the cm_id.
2202          */
2203         mutex_lock(&lock);
2204         if (cma_comp(conn_id, RDMA_CM_CONNECT) &&
2205             (conn_id->id.qp_type != IB_QPT_UD)) {
2206                 trace_cm_send_mra(cm_id->context);
2207                 ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
2208         }
2209         mutex_unlock(&lock);
2210         mutex_unlock(&conn_id->handler_mutex);
2211         mutex_unlock(&listen_id->handler_mutex);
2212         cma_id_put(conn_id);
2213         if (net_dev)
2214                 dev_put(net_dev);
2215         return 0;
2216
2217 err3:
2218         cma_id_put(conn_id);
2219         /* Destroy the CM ID by returning a non-zero value. */
2220         conn_id->cm_id.ib = NULL;
2221 err2:
2222         cma_exch(conn_id, RDMA_CM_DESTROYING);
2223         mutex_unlock(&conn_id->handler_mutex);
2224 err1:
2225         mutex_unlock(&listen_id->handler_mutex);
2226         if (conn_id)
2227                 rdma_destroy_id(&conn_id->id);
2228
2229 net_dev_put:
2230         if (net_dev)
2231                 dev_put(net_dev);
2232
2233         return ret;
2234 }
2235
2236 __be64 rdma_get_service_id(struct rdma_cm_id *id, struct sockaddr *addr)
2237 {
2238         if (addr->sa_family == AF_IB)
2239                 return ((struct sockaddr_ib *) addr)->sib_sid;
2240
2241         return cpu_to_be64(((u64)id->ps << 16) + be16_to_cpu(cma_port(addr)));
2242 }
2243 EXPORT_SYMBOL(rdma_get_service_id);
2244
2245 void rdma_read_gids(struct rdma_cm_id *cm_id, union ib_gid *sgid,
2246                     union ib_gid *dgid)
2247 {
2248         struct rdma_addr *addr = &cm_id->route.addr;
2249
2250         if (!cm_id->device) {
2251                 if (sgid)
2252                         memset(sgid, 0, sizeof(*sgid));
2253                 if (dgid)
2254                         memset(dgid, 0, sizeof(*dgid));
2255                 return;
2256         }
2257
2258         if (rdma_protocol_roce(cm_id->device, cm_id->port_num)) {
2259                 if (sgid)
2260                         rdma_ip2gid((struct sockaddr *)&addr->src_addr, sgid);
2261                 if (dgid)
2262                         rdma_ip2gid((struct sockaddr *)&addr->dst_addr, dgid);
2263         } else {
2264                 if (sgid)
2265                         rdma_addr_get_sgid(&addr->dev_addr, sgid);
2266                 if (dgid)
2267                         rdma_addr_get_dgid(&addr->dev_addr, dgid);
2268         }
2269 }
2270 EXPORT_SYMBOL(rdma_read_gids);
2271
2272 static int cma_iw_handler(struct iw_cm_id *iw_id, struct iw_cm_event *iw_event)
2273 {
2274         struct rdma_id_private *id_priv = iw_id->context;
2275         struct rdma_cm_event event = {};
2276         int ret = 0;
2277         struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr;
2278         struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr;
2279
2280         mutex_lock(&id_priv->handler_mutex);
2281         if (id_priv->state != RDMA_CM_CONNECT)
2282                 goto out;
2283
2284         switch (iw_event->event) {
2285         case IW_CM_EVENT_CLOSE:
2286                 event.event = RDMA_CM_EVENT_DISCONNECTED;
2287                 break;
2288         case IW_CM_EVENT_CONNECT_REPLY:
2289                 memcpy(cma_src_addr(id_priv), laddr,
2290                        rdma_addr_size(laddr));
2291                 memcpy(cma_dst_addr(id_priv), raddr,
2292                        rdma_addr_size(raddr));
2293                 switch (iw_event->status) {
2294                 case 0:
2295                         event.event = RDMA_CM_EVENT_ESTABLISHED;
2296                         event.param.conn.initiator_depth = iw_event->ird;
2297                         event.param.conn.responder_resources = iw_event->ord;
2298                         break;
2299                 case -ECONNRESET:
2300                 case -ECONNREFUSED:
2301                         event.event = RDMA_CM_EVENT_REJECTED;
2302                         break;
2303                 case -ETIMEDOUT:
2304                         event.event = RDMA_CM_EVENT_UNREACHABLE;
2305                         break;
2306                 default:
2307                         event.event = RDMA_CM_EVENT_CONNECT_ERROR;
2308                         break;
2309                 }
2310                 break;
2311         case IW_CM_EVENT_ESTABLISHED:
2312                 event.event = RDMA_CM_EVENT_ESTABLISHED;
2313                 event.param.conn.initiator_depth = iw_event->ird;
2314                 event.param.conn.responder_resources = iw_event->ord;
2315                 break;
2316         default:
2317                 goto out;
2318         }
2319
2320         event.status = iw_event->status;
2321         event.param.conn.private_data = iw_event->private_data;
2322         event.param.conn.private_data_len = iw_event->private_data_len;
2323         ret = cma_cm_event_handler(id_priv, &event);
2324         if (ret) {
2325                 /* Destroy the CM ID by returning a non-zero value. */
2326                 id_priv->cm_id.iw = NULL;
2327                 cma_exch(id_priv, RDMA_CM_DESTROYING);
2328                 mutex_unlock(&id_priv->handler_mutex);
2329                 rdma_destroy_id(&id_priv->id);
2330                 return ret;
2331         }
2332
2333 out:
2334         mutex_unlock(&id_priv->handler_mutex);
2335         return ret;
2336 }
2337
2338 static int iw_conn_req_handler(struct iw_cm_id *cm_id,
2339                                struct iw_cm_event *iw_event)
2340 {
2341         struct rdma_cm_id *new_cm_id;
2342         struct rdma_id_private *listen_id, *conn_id;
2343         struct rdma_cm_event event = {};
2344         int ret = -ECONNABORTED;
2345         struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr;
2346         struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr;
2347
2348         event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
2349         event.param.conn.private_data = iw_event->private_data;
2350         event.param.conn.private_data_len = iw_event->private_data_len;
2351         event.param.conn.initiator_depth = iw_event->ird;
2352         event.param.conn.responder_resources = iw_event->ord;
2353
2354         listen_id = cm_id->context;
2355
2356         mutex_lock(&listen_id->handler_mutex);
2357         if (listen_id->state != RDMA_CM_LISTEN)
2358                 goto out;
2359
2360         /* Create a new RDMA id for the new IW CM ID */
2361         new_cm_id = __rdma_create_id(listen_id->id.route.addr.dev_addr.net,
2362                                      listen_id->id.event_handler,
2363                                      listen_id->id.context,
2364                                      RDMA_PS_TCP, IB_QPT_RC,
2365                                      listen_id->res.kern_name);
2366         if (IS_ERR(new_cm_id)) {
2367                 ret = -ENOMEM;
2368                 goto out;
2369         }
2370         conn_id = container_of(new_cm_id, struct rdma_id_private, id);
2371         mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
2372         conn_id->state = RDMA_CM_CONNECT;
2373
2374         ret = rdma_translate_ip(laddr, &conn_id->id.route.addr.dev_addr);
2375         if (ret) {
2376                 mutex_unlock(&conn_id->handler_mutex);
2377                 rdma_destroy_id(new_cm_id);
2378                 goto out;
2379         }
2380
2381         ret = cma_iw_acquire_dev(conn_id, listen_id);
2382         if (ret) {
2383                 mutex_unlock(&conn_id->handler_mutex);
2384                 rdma_destroy_id(new_cm_id);
2385                 goto out;
2386         }
2387
2388         conn_id->cm_id.iw = cm_id;
2389         cm_id->context = conn_id;
2390         cm_id->cm_handler = cma_iw_handler;
2391
2392         memcpy(cma_src_addr(conn_id), laddr, rdma_addr_size(laddr));
2393         memcpy(cma_dst_addr(conn_id), raddr, rdma_addr_size(raddr));
2394
2395         /*
2396          * Protect against the user destroying conn_id from another thread
2397          * until we're done accessing it.
2398          */
2399         cma_id_get(conn_id);
2400         ret = cma_cm_event_handler(conn_id, &event);
2401         if (ret) {
2402                 /* User wants to destroy the CM ID */
2403                 conn_id->cm_id.iw = NULL;
2404                 cma_exch(conn_id, RDMA_CM_DESTROYING);
2405                 mutex_unlock(&conn_id->handler_mutex);
2406                 mutex_unlock(&listen_id->handler_mutex);
2407                 cma_id_put(conn_id);
2408                 rdma_destroy_id(&conn_id->id);
2409                 return ret;
2410         }
2411
2412         mutex_unlock(&conn_id->handler_mutex);
2413         cma_id_put(conn_id);
2414
2415 out:
2416         mutex_unlock(&listen_id->handler_mutex);
2417         return ret;
2418 }
2419
2420 static int cma_ib_listen(struct rdma_id_private *id_priv)
2421 {
2422         struct sockaddr *addr;
2423         struct ib_cm_id *id;
2424         __be64 svc_id;
2425
2426         addr = cma_src_addr(id_priv);
2427         svc_id = rdma_get_service_id(&id_priv->id, addr);
2428         id = ib_cm_insert_listen(id_priv->id.device,
2429                                  cma_ib_req_handler, svc_id);
2430         if (IS_ERR(id))
2431                 return PTR_ERR(id);
2432         id_priv->cm_id.ib = id;
2433
2434         return 0;
2435 }
2436
2437 static int cma_iw_listen(struct rdma_id_private *id_priv, int backlog)
2438 {
2439         int ret;
2440         struct iw_cm_id *id;
2441
2442         id = iw_create_cm_id(id_priv->id.device,
2443                              iw_conn_req_handler,
2444                              id_priv);
2445         if (IS_ERR(id))
2446                 return PTR_ERR(id);
2447
2448         id->tos = id_priv->tos;
2449         id->tos_set = id_priv->tos_set;
2450         id_priv->cm_id.iw = id;
2451
2452         memcpy(&id_priv->cm_id.iw->local_addr, cma_src_addr(id_priv),
2453                rdma_addr_size(cma_src_addr(id_priv)));
2454
2455         ret = iw_cm_listen(id_priv->cm_id.iw, backlog);
2456
2457         if (ret) {
2458                 iw_destroy_cm_id(id_priv->cm_id.iw);
2459                 id_priv->cm_id.iw = NULL;
2460         }
2461
2462         return ret;
2463 }
2464
2465 static int cma_listen_handler(struct rdma_cm_id *id,
2466                               struct rdma_cm_event *event)
2467 {
2468         struct rdma_id_private *id_priv = id->context;
2469
2470         id->context = id_priv->id.context;
2471         id->event_handler = id_priv->id.event_handler;
2472         trace_cm_event_handler(id_priv, event);
2473         return id_priv->id.event_handler(id, event);
2474 }
2475
2476 static void cma_listen_on_dev(struct rdma_id_private *id_priv,
2477                               struct cma_device *cma_dev)
2478 {
2479         struct rdma_id_private *dev_id_priv;
2480         struct rdma_cm_id *id;
2481         struct net *net = id_priv->id.route.addr.dev_addr.net;
2482         int ret;
2483
2484         if (cma_family(id_priv) == AF_IB && !rdma_cap_ib_cm(cma_dev->device, 1))
2485                 return;
2486
2487         id = __rdma_create_id(net, cma_listen_handler, id_priv, id_priv->id.ps,
2488                               id_priv->id.qp_type, id_priv->res.kern_name);
2489         if (IS_ERR(id))
2490                 return;
2491
2492         dev_id_priv = container_of(id, struct rdma_id_private, id);
2493
2494         dev_id_priv->state = RDMA_CM_ADDR_BOUND;
2495         memcpy(cma_src_addr(dev_id_priv), cma_src_addr(id_priv),
2496                rdma_addr_size(cma_src_addr(id_priv)));
2497
2498         _cma_attach_to_dev(dev_id_priv, cma_dev);
2499         list_add_tail(&dev_id_priv->listen_list, &id_priv->listen_list);
2500         cma_id_get(id_priv);
2501         dev_id_priv->internal_id = 1;
2502         dev_id_priv->afonly = id_priv->afonly;
2503         dev_id_priv->tos_set = id_priv->tos_set;
2504         dev_id_priv->tos = id_priv->tos;
2505
2506         ret = rdma_listen(id, id_priv->backlog);
2507         if (ret)
2508                 dev_warn(&cma_dev->device->dev,
2509                          "RDMA CMA: cma_listen_on_dev, error %d\n", ret);
2510 }
2511
2512 static void cma_listen_on_all(struct rdma_id_private *id_priv)
2513 {
2514         struct cma_device *cma_dev;
2515
2516         mutex_lock(&lock);
2517         list_add_tail(&id_priv->list, &listen_any_list);
2518         list_for_each_entry(cma_dev, &dev_list, list)
2519                 cma_listen_on_dev(id_priv, cma_dev);
2520         mutex_unlock(&lock);
2521 }
2522
2523 void rdma_set_service_type(struct rdma_cm_id *id, int tos)
2524 {
2525         struct rdma_id_private *id_priv;
2526
2527         id_priv = container_of(id, struct rdma_id_private, id);
2528         id_priv->tos = (u8) tos;
2529         id_priv->tos_set = true;
2530 }
2531 EXPORT_SYMBOL(rdma_set_service_type);
2532
2533 /**
2534  * rdma_set_ack_timeout() - Set the ack timeout of QP associated
2535  *                          with a connection identifier.
2536  * @id: Communication identifier to associated with service type.
2537  * @timeout: Ack timeout to set a QP, expressed as 4.096 * 2^(timeout) usec.
2538  *
2539  * This function should be called before rdma_connect() on active side,
2540  * and on passive side before rdma_accept(). It is applicable to primary
2541  * path only. The timeout will affect the local side of the QP, it is not
2542  * negotiated with remote side and zero disables the timer. In case it is
2543  * set before rdma_resolve_route, the value will also be used to determine
2544  * PacketLifeTime for RoCE.
2545  *
2546  * Return: 0 for success
2547  */
2548 int rdma_set_ack_timeout(struct rdma_cm_id *id, u8 timeout)
2549 {
2550         struct rdma_id_private *id_priv;
2551
2552         if (id->qp_type != IB_QPT_RC)
2553                 return -EINVAL;
2554
2555         id_priv = container_of(id, struct rdma_id_private, id);
2556         id_priv->timeout = timeout;
2557         id_priv->timeout_set = true;
2558
2559         return 0;
2560 }
2561 EXPORT_SYMBOL(rdma_set_ack_timeout);
2562
2563 static void cma_query_handler(int status, struct sa_path_rec *path_rec,
2564                               void *context)
2565 {
2566         struct cma_work *work = context;
2567         struct rdma_route *route;
2568
2569         route = &work->id->id.route;
2570
2571         if (!status) {
2572                 route->num_paths = 1;
2573                 *route->path_rec = *path_rec;
2574         } else {
2575                 work->old_state = RDMA_CM_ROUTE_QUERY;
2576                 work->new_state = RDMA_CM_ADDR_RESOLVED;
2577                 work->event.event = RDMA_CM_EVENT_ROUTE_ERROR;
2578                 work->event.status = status;
2579                 pr_debug_ratelimited("RDMA CM: ROUTE_ERROR: failed to query path. status %d\n",
2580                                      status);
2581         }
2582
2583         queue_work(cma_wq, &work->work);
2584 }
2585
2586 static int cma_query_ib_route(struct rdma_id_private *id_priv,
2587                               unsigned long timeout_ms, struct cma_work *work)
2588 {
2589         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
2590         struct sa_path_rec path_rec;
2591         ib_sa_comp_mask comp_mask;
2592         struct sockaddr_in6 *sin6;
2593         struct sockaddr_ib *sib;
2594
2595         memset(&path_rec, 0, sizeof path_rec);
2596
2597         if (rdma_cap_opa_ah(id_priv->id.device, id_priv->id.port_num))
2598                 path_rec.rec_type = SA_PATH_REC_TYPE_OPA;
2599         else
2600                 path_rec.rec_type = SA_PATH_REC_TYPE_IB;
2601         rdma_addr_get_sgid(dev_addr, &path_rec.sgid);
2602         rdma_addr_get_dgid(dev_addr, &path_rec.dgid);
2603         path_rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
2604         path_rec.numb_path = 1;
2605         path_rec.reversible = 1;
2606         path_rec.service_id = rdma_get_service_id(&id_priv->id,
2607                                                   cma_dst_addr(id_priv));
2608
2609         comp_mask = IB_SA_PATH_REC_DGID | IB_SA_PATH_REC_SGID |
2610                     IB_SA_PATH_REC_PKEY | IB_SA_PATH_REC_NUMB_PATH |
2611                     IB_SA_PATH_REC_REVERSIBLE | IB_SA_PATH_REC_SERVICE_ID;
2612
2613         switch (cma_family(id_priv)) {
2614         case AF_INET:
2615                 path_rec.qos_class = cpu_to_be16((u16) id_priv->tos);
2616                 comp_mask |= IB_SA_PATH_REC_QOS_CLASS;
2617                 break;
2618         case AF_INET6:
2619                 sin6 = (struct sockaddr_in6 *) cma_src_addr(id_priv);
2620                 path_rec.traffic_class = (u8) (be32_to_cpu(sin6->sin6_flowinfo) >> 20);
2621                 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
2622                 break;
2623         case AF_IB:
2624                 sib = (struct sockaddr_ib *) cma_src_addr(id_priv);
2625                 path_rec.traffic_class = (u8) (be32_to_cpu(sib->sib_flowinfo) >> 20);
2626                 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
2627                 break;
2628         }
2629
2630         id_priv->query_id = ib_sa_path_rec_get(&sa_client, id_priv->id.device,
2631                                                id_priv->id.port_num, &path_rec,
2632                                                comp_mask, timeout_ms,
2633                                                GFP_KERNEL, cma_query_handler,
2634                                                work, &id_priv->query);
2635
2636         return (id_priv->query_id < 0) ? id_priv->query_id : 0;
2637 }
2638
2639 static void cma_work_handler(struct work_struct *_work)
2640 {
2641         struct cma_work *work = container_of(_work, struct cma_work, work);
2642         struct rdma_id_private *id_priv = work->id;
2643         int destroy = 0;
2644
2645         mutex_lock(&id_priv->handler_mutex);
2646         if (!cma_comp_exch(id_priv, work->old_state, work->new_state))
2647                 goto out;
2648
2649         if (cma_cm_event_handler(id_priv, &work->event)) {
2650                 cma_exch(id_priv, RDMA_CM_DESTROYING);
2651                 destroy = 1;
2652         }
2653 out:
2654         mutex_unlock(&id_priv->handler_mutex);
2655         cma_id_put(id_priv);
2656         if (destroy)
2657                 rdma_destroy_id(&id_priv->id);
2658         kfree(work);
2659 }
2660
2661 static void cma_ndev_work_handler(struct work_struct *_work)
2662 {
2663         struct cma_ndev_work *work = container_of(_work, struct cma_ndev_work, work);
2664         struct rdma_id_private *id_priv = work->id;
2665         int destroy = 0;
2666
2667         mutex_lock(&id_priv->handler_mutex);
2668         if (id_priv->state == RDMA_CM_DESTROYING ||
2669             id_priv->state == RDMA_CM_DEVICE_REMOVAL)
2670                 goto out;
2671
2672         if (cma_cm_event_handler(id_priv, &work->event)) {
2673                 cma_exch(id_priv, RDMA_CM_DESTROYING);
2674                 destroy = 1;
2675         }
2676
2677 out:
2678         mutex_unlock(&id_priv->handler_mutex);
2679         cma_id_put(id_priv);
2680         if (destroy)
2681                 rdma_destroy_id(&id_priv->id);
2682         kfree(work);
2683 }
2684
2685 static void cma_init_resolve_route_work(struct cma_work *work,
2686                                         struct rdma_id_private *id_priv)
2687 {
2688         work->id = id_priv;
2689         INIT_WORK(&work->work, cma_work_handler);
2690         work->old_state = RDMA_CM_ROUTE_QUERY;
2691         work->new_state = RDMA_CM_ROUTE_RESOLVED;
2692         work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
2693 }
2694
2695 static void enqueue_resolve_addr_work(struct cma_work *work,
2696                                       struct rdma_id_private *id_priv)
2697 {
2698         /* Balances with cma_id_put() in cma_work_handler */
2699         cma_id_get(id_priv);
2700
2701         work->id = id_priv;
2702         INIT_WORK(&work->work, cma_work_handler);
2703         work->old_state = RDMA_CM_ADDR_QUERY;
2704         work->new_state = RDMA_CM_ADDR_RESOLVED;
2705         work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
2706
2707         queue_work(cma_wq, &work->work);
2708 }
2709
2710 static int cma_resolve_ib_route(struct rdma_id_private *id_priv,
2711                                 unsigned long timeout_ms)
2712 {
2713         struct rdma_route *route = &id_priv->id.route;
2714         struct cma_work *work;
2715         int ret;
2716
2717         work = kzalloc(sizeof *work, GFP_KERNEL);
2718         if (!work)
2719                 return -ENOMEM;
2720
2721         cma_init_resolve_route_work(work, id_priv);
2722
2723         route->path_rec = kmalloc(sizeof *route->path_rec, GFP_KERNEL);
2724         if (!route->path_rec) {
2725                 ret = -ENOMEM;
2726                 goto err1;
2727         }
2728
2729         ret = cma_query_ib_route(id_priv, timeout_ms, work);
2730         if (ret)
2731                 goto err2;
2732
2733         return 0;
2734 err2:
2735         kfree(route->path_rec);
2736         route->path_rec = NULL;
2737 err1:
2738         kfree(work);
2739         return ret;
2740 }
2741
2742 static enum ib_gid_type cma_route_gid_type(enum rdma_network_type network_type,
2743                                            unsigned long supported_gids,
2744                                            enum ib_gid_type default_gid)
2745 {
2746         if ((network_type == RDMA_NETWORK_IPV4 ||
2747              network_type == RDMA_NETWORK_IPV6) &&
2748             test_bit(IB_GID_TYPE_ROCE_UDP_ENCAP, &supported_gids))
2749                 return IB_GID_TYPE_ROCE_UDP_ENCAP;
2750
2751         return default_gid;
2752 }
2753
2754 /*
2755  * cma_iboe_set_path_rec_l2_fields() is helper function which sets
2756  * path record type based on GID type.
2757  * It also sets up other L2 fields which includes destination mac address
2758  * netdev ifindex, of the path record.
2759  * It returns the netdev of the bound interface for this path record entry.
2760  */
2761 static struct net_device *
2762 cma_iboe_set_path_rec_l2_fields(struct rdma_id_private *id_priv)
2763 {
2764         struct rdma_route *route = &id_priv->id.route;
2765         enum ib_gid_type gid_type = IB_GID_TYPE_ROCE;
2766         struct rdma_addr *addr = &route->addr;
2767         unsigned long supported_gids;
2768         struct net_device *ndev;
2769
2770         if (!addr->dev_addr.bound_dev_if)
2771                 return NULL;
2772
2773         ndev = dev_get_by_index(addr->dev_addr.net,
2774                                 addr->dev_addr.bound_dev_if);
2775         if (!ndev)
2776                 return NULL;
2777
2778         supported_gids = roce_gid_type_mask_support(id_priv->id.device,
2779                                                     id_priv->id.port_num);
2780         gid_type = cma_route_gid_type(addr->dev_addr.network,
2781                                       supported_gids,
2782                                       id_priv->gid_type);
2783         /* Use the hint from IP Stack to select GID Type */
2784         if (gid_type < ib_network_to_gid_type(addr->dev_addr.network))
2785                 gid_type = ib_network_to_gid_type(addr->dev_addr.network);
2786         route->path_rec->rec_type = sa_conv_gid_to_pathrec_type(gid_type);
2787
2788         route->path_rec->roce.route_resolved = true;
2789         sa_path_set_dmac(route->path_rec, addr->dev_addr.dst_dev_addr);
2790         return ndev;
2791 }
2792
2793 int rdma_set_ib_path(struct rdma_cm_id *id,
2794                      struct sa_path_rec *path_rec)
2795 {
2796         struct rdma_id_private *id_priv;
2797         struct net_device *ndev;
2798         int ret;
2799
2800         id_priv = container_of(id, struct rdma_id_private, id);
2801         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
2802                            RDMA_CM_ROUTE_RESOLVED))
2803                 return -EINVAL;
2804
2805         id->route.path_rec = kmemdup(path_rec, sizeof(*path_rec),
2806                                      GFP_KERNEL);
2807         if (!id->route.path_rec) {
2808                 ret = -ENOMEM;
2809                 goto err;
2810         }
2811
2812         if (rdma_protocol_roce(id->device, id->port_num)) {
2813                 ndev = cma_iboe_set_path_rec_l2_fields(id_priv);
2814                 if (!ndev) {
2815                         ret = -ENODEV;
2816                         goto err_free;
2817                 }
2818                 dev_put(ndev);
2819         }
2820
2821         id->route.num_paths = 1;
2822         return 0;
2823
2824 err_free:
2825         kfree(id->route.path_rec);
2826         id->route.path_rec = NULL;
2827 err:
2828         cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_ADDR_RESOLVED);
2829         return ret;
2830 }
2831 EXPORT_SYMBOL(rdma_set_ib_path);
2832
2833 static int cma_resolve_iw_route(struct rdma_id_private *id_priv)
2834 {
2835         struct cma_work *work;
2836
2837         work = kzalloc(sizeof *work, GFP_KERNEL);
2838         if (!work)
2839                 return -ENOMEM;
2840
2841         cma_init_resolve_route_work(work, id_priv);
2842         queue_work(cma_wq, &work->work);
2843         return 0;
2844 }
2845
2846 static int get_vlan_ndev_tc(struct net_device *vlan_ndev, int prio)
2847 {
2848         struct net_device *dev;
2849
2850         dev = vlan_dev_real_dev(vlan_ndev);
2851         if (dev->num_tc)
2852                 return netdev_get_prio_tc_map(dev, prio);
2853
2854         return (vlan_dev_get_egress_qos_mask(vlan_ndev, prio) &
2855                 VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
2856 }
2857
2858 struct iboe_prio_tc_map {
2859         int input_prio;
2860         int output_tc;
2861         bool found;
2862 };
2863
2864 static int get_lower_vlan_dev_tc(struct net_device *dev, void *data)
2865 {
2866         struct iboe_prio_tc_map *map = data;
2867
2868         if (is_vlan_dev(dev))
2869                 map->output_tc = get_vlan_ndev_tc(dev, map->input_prio);
2870         else if (dev->num_tc)
2871                 map->output_tc = netdev_get_prio_tc_map(dev, map->input_prio);
2872         else
2873                 map->output_tc = 0;
2874         /* We are interested only in first level VLAN device, so always
2875          * return 1 to stop iterating over next level devices.
2876          */
2877         map->found = true;
2878         return 1;
2879 }
2880
2881 static int iboe_tos_to_sl(struct net_device *ndev, int tos)
2882 {
2883         struct iboe_prio_tc_map prio_tc_map = {};
2884         int prio = rt_tos2priority(tos);
2885
2886         /* If VLAN device, get it directly from the VLAN netdev */
2887         if (is_vlan_dev(ndev))
2888                 return get_vlan_ndev_tc(ndev, prio);
2889
2890         prio_tc_map.input_prio = prio;
2891         rcu_read_lock();
2892         netdev_walk_all_lower_dev_rcu(ndev,
2893                                       get_lower_vlan_dev_tc,
2894                                       &prio_tc_map);
2895         rcu_read_unlock();
2896         /* If map is found from lower device, use it; Otherwise
2897          * continue with the current netdevice to get priority to tc map.
2898          */
2899         if (prio_tc_map.found)
2900                 return prio_tc_map.output_tc;
2901         else if (ndev->num_tc)
2902                 return netdev_get_prio_tc_map(ndev, prio);
2903         else
2904                 return 0;
2905 }
2906
2907 static int cma_resolve_iboe_route(struct rdma_id_private *id_priv)
2908 {
2909         struct rdma_route *route = &id_priv->id.route;
2910         struct rdma_addr *addr = &route->addr;
2911         struct cma_work *work;
2912         int ret;
2913         struct net_device *ndev;
2914
2915         u8 default_roce_tos = id_priv->cma_dev->default_roce_tos[id_priv->id.port_num -
2916                                         rdma_start_port(id_priv->cma_dev->device)];
2917         u8 tos = id_priv->tos_set ? id_priv->tos : default_roce_tos;
2918
2919
2920         work = kzalloc(sizeof *work, GFP_KERNEL);
2921         if (!work)
2922                 return -ENOMEM;
2923
2924         route->path_rec = kzalloc(sizeof *route->path_rec, GFP_KERNEL);
2925         if (!route->path_rec) {
2926                 ret = -ENOMEM;
2927                 goto err1;
2928         }
2929
2930         route->num_paths = 1;
2931
2932         ndev = cma_iboe_set_path_rec_l2_fields(id_priv);
2933         if (!ndev) {
2934                 ret = -ENODEV;
2935                 goto err2;
2936         }
2937
2938         rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
2939                     &route->path_rec->sgid);
2940         rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.dst_addr,
2941                     &route->path_rec->dgid);
2942
2943         if (((struct sockaddr *)&id_priv->id.route.addr.dst_addr)->sa_family != AF_IB)
2944                 /* TODO: get the hoplimit from the inet/inet6 device */
2945                 route->path_rec->hop_limit = addr->dev_addr.hoplimit;
2946         else
2947                 route->path_rec->hop_limit = 1;
2948         route->path_rec->reversible = 1;
2949         route->path_rec->pkey = cpu_to_be16(0xffff);
2950         route->path_rec->mtu_selector = IB_SA_EQ;
2951         route->path_rec->sl = iboe_tos_to_sl(ndev, tos);
2952         route->path_rec->traffic_class = tos;
2953         route->path_rec->mtu = iboe_get_mtu(ndev->mtu);
2954         route->path_rec->rate_selector = IB_SA_EQ;
2955         route->path_rec->rate = iboe_get_rate(ndev);
2956         dev_put(ndev);
2957         route->path_rec->packet_life_time_selector = IB_SA_EQ;
2958         /* In case ACK timeout is set, use this value to calculate
2959          * PacketLifeTime.  As per IBTA 12.7.34,
2960          * local ACK timeout = (2 * PacketLifeTime + Local CA’s ACK delay).
2961          * Assuming a negligible local ACK delay, we can use
2962          * PacketLifeTime = local ACK timeout/2
2963          * as a reasonable approximation for RoCE networks.
2964          */
2965         route->path_rec->packet_life_time = id_priv->timeout_set ?
2966                 id_priv->timeout - 1 : CMA_IBOE_PACKET_LIFETIME;
2967
2968         if (!route->path_rec->mtu) {
2969                 ret = -EINVAL;
2970                 goto err2;
2971         }
2972
2973         cma_init_resolve_route_work(work, id_priv);
2974         queue_work(cma_wq, &work->work);
2975
2976         return 0;
2977
2978 err2:
2979         kfree(route->path_rec);
2980         route->path_rec = NULL;
2981         route->num_paths = 0;
2982 err1:
2983         kfree(work);
2984         return ret;
2985 }
2986
2987 int rdma_resolve_route(struct rdma_cm_id *id, unsigned long timeout_ms)
2988 {
2989         struct rdma_id_private *id_priv;
2990         int ret;
2991
2992         id_priv = container_of(id, struct rdma_id_private, id);
2993         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED, RDMA_CM_ROUTE_QUERY))
2994                 return -EINVAL;
2995
2996         cma_id_get(id_priv);
2997         if (rdma_cap_ib_sa(id->device, id->port_num))
2998                 ret = cma_resolve_ib_route(id_priv, timeout_ms);
2999         else if (rdma_protocol_roce(id->device, id->port_num))
3000                 ret = cma_resolve_iboe_route(id_priv);
3001         else if (rdma_protocol_iwarp(id->device, id->port_num))
3002                 ret = cma_resolve_iw_route(id_priv);
3003         else
3004                 ret = -ENOSYS;
3005
3006         if (ret)
3007                 goto err;
3008
3009         return 0;
3010 err:
3011         cma_comp_exch(id_priv, RDMA_CM_ROUTE_QUERY, RDMA_CM_ADDR_RESOLVED);
3012         cma_id_put(id_priv);
3013         return ret;
3014 }
3015 EXPORT_SYMBOL(rdma_resolve_route);
3016
3017 static void cma_set_loopback(struct sockaddr *addr)
3018 {
3019         switch (addr->sa_family) {
3020         case AF_INET:
3021                 ((struct sockaddr_in *) addr)->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
3022                 break;
3023         case AF_INET6:
3024                 ipv6_addr_set(&((struct sockaddr_in6 *) addr)->sin6_addr,
3025                               0, 0, 0, htonl(1));
3026                 break;
3027         default:
3028                 ib_addr_set(&((struct sockaddr_ib *) addr)->sib_addr,
3029                             0, 0, 0, htonl(1));
3030                 break;
3031         }
3032 }
3033
3034 static int cma_bind_loopback(struct rdma_id_private *id_priv)
3035 {
3036         struct cma_device *cma_dev, *cur_dev;
3037         union ib_gid gid;
3038         enum ib_port_state port_state;
3039         unsigned int p;
3040         u16 pkey;
3041         int ret;
3042
3043         cma_dev = NULL;
3044         mutex_lock(&lock);
3045         list_for_each_entry(cur_dev, &dev_list, list) {
3046                 if (cma_family(id_priv) == AF_IB &&
3047                     !rdma_cap_ib_cm(cur_dev->device, 1))
3048                         continue;
3049
3050                 if (!cma_dev)
3051                         cma_dev = cur_dev;
3052
3053                 rdma_for_each_port (cur_dev->device, p) {
3054                         if (!ib_get_cached_port_state(cur_dev->device, p, &port_state) &&
3055                             port_state == IB_PORT_ACTIVE) {
3056                                 cma_dev = cur_dev;
3057                                 goto port_found;
3058                         }
3059                 }
3060         }
3061
3062         if (!cma_dev) {
3063                 ret = -ENODEV;
3064                 goto out;
3065         }
3066
3067         p = 1;
3068
3069 port_found:
3070         ret = rdma_query_gid(cma_dev->device, p, 0, &gid);
3071         if (ret)
3072                 goto out;
3073
3074         ret = ib_get_cached_pkey(cma_dev->device, p, 0, &pkey);
3075         if (ret)
3076                 goto out;
3077
3078         id_priv->id.route.addr.dev_addr.dev_type =
3079                 (rdma_protocol_ib(cma_dev->device, p)) ?
3080                 ARPHRD_INFINIBAND : ARPHRD_ETHER;
3081
3082         rdma_addr_set_sgid(&id_priv->id.route.addr.dev_addr, &gid);
3083         ib_addr_set_pkey(&id_priv->id.route.addr.dev_addr, pkey);
3084         id_priv->id.port_num = p;
3085         cma_attach_to_dev(id_priv, cma_dev);
3086         cma_set_loopback(cma_src_addr(id_priv));
3087 out:
3088         mutex_unlock(&lock);
3089         return ret;
3090 }
3091
3092 static void addr_handler(int status, struct sockaddr *src_addr,
3093                          struct rdma_dev_addr *dev_addr, void *context)
3094 {
3095         struct rdma_id_private *id_priv = context;
3096         struct rdma_cm_event event = {};
3097         struct sockaddr *addr;
3098         struct sockaddr_storage old_addr;
3099
3100         mutex_lock(&id_priv->handler_mutex);
3101         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY,
3102                            RDMA_CM_ADDR_RESOLVED))
3103                 goto out;
3104
3105         /*
3106          * Store the previous src address, so that if we fail to acquire
3107          * matching rdma device, old address can be restored back, which helps
3108          * to cancel the cma listen operation correctly.
3109          */
3110         addr = cma_src_addr(id_priv);
3111         memcpy(&old_addr, addr, rdma_addr_size(addr));
3112         memcpy(addr, src_addr, rdma_addr_size(src_addr));
3113         if (!status && !id_priv->cma_dev) {
3114                 status = cma_acquire_dev_by_src_ip(id_priv);
3115                 if (status)
3116                         pr_debug_ratelimited("RDMA CM: ADDR_ERROR: failed to acquire device. status %d\n",
3117                                              status);
3118         } else if (status) {
3119                 pr_debug_ratelimited("RDMA CM: ADDR_ERROR: failed to resolve IP. status %d\n", status);
3120         }
3121
3122         if (status) {
3123                 memcpy(addr, &old_addr,
3124                        rdma_addr_size((struct sockaddr *)&old_addr));
3125                 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
3126                                    RDMA_CM_ADDR_BOUND))
3127                         goto out;
3128                 event.event = RDMA_CM_EVENT_ADDR_ERROR;
3129                 event.status = status;
3130         } else
3131                 event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
3132
3133         if (cma_cm_event_handler(id_priv, &event)) {
3134                 cma_exch(id_priv, RDMA_CM_DESTROYING);
3135                 mutex_unlock(&id_priv->handler_mutex);
3136                 rdma_destroy_id(&id_priv->id);
3137                 return;
3138         }
3139 out:
3140         mutex_unlock(&id_priv->handler_mutex);
3141 }
3142
3143 static int cma_resolve_loopback(struct rdma_id_private *id_priv)
3144 {
3145         struct cma_work *work;
3146         union ib_gid gid;
3147         int ret;
3148
3149         work = kzalloc(sizeof *work, GFP_KERNEL);
3150         if (!work)
3151                 return -ENOMEM;
3152
3153         if (!id_priv->cma_dev) {
3154                 ret = cma_bind_loopback(id_priv);
3155                 if (ret)
3156                         goto err;
3157         }
3158
3159         rdma_addr_get_sgid(&id_priv->id.route.addr.dev_addr, &gid);
3160         rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, &gid);
3161
3162         enqueue_resolve_addr_work(work, id_priv);
3163         return 0;
3164 err:
3165         kfree(work);
3166         return ret;
3167 }
3168
3169 static int cma_resolve_ib_addr(struct rdma_id_private *id_priv)
3170 {
3171         struct cma_work *work;
3172         int ret;
3173
3174         work = kzalloc(sizeof *work, GFP_KERNEL);
3175         if (!work)
3176                 return -ENOMEM;
3177
3178         if (!id_priv->cma_dev) {
3179                 ret = cma_resolve_ib_dev(id_priv);
3180                 if (ret)
3181                         goto err;
3182         }
3183
3184         rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, (union ib_gid *)
3185                 &(((struct sockaddr_ib *) &id_priv->id.route.addr.dst_addr)->sib_addr));
3186
3187         enqueue_resolve_addr_work(work, id_priv);
3188         return 0;
3189 err:
3190         kfree(work);
3191         return ret;
3192 }
3193
3194 static int cma_bind_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
3195                          const struct sockaddr *dst_addr)
3196 {
3197         if (!src_addr || !src_addr->sa_family) {
3198                 src_addr = (struct sockaddr *) &id->route.addr.src_addr;
3199                 src_addr->sa_family = dst_addr->sa_family;
3200                 if (IS_ENABLED(CONFIG_IPV6) &&
3201                     dst_addr->sa_family == AF_INET6) {
3202                         struct sockaddr_in6 *src_addr6 = (struct sockaddr_in6 *) src_addr;
3203                         struct sockaddr_in6 *dst_addr6 = (struct sockaddr_in6 *) dst_addr;
3204                         src_addr6->sin6_scope_id = dst_addr6->sin6_scope_id;
3205                         if (ipv6_addr_type(&dst_addr6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
3206                                 id->route.addr.dev_addr.bound_dev_if = dst_addr6->sin6_scope_id;
3207                 } else if (dst_addr->sa_family == AF_IB) {
3208                         ((struct sockaddr_ib *) src_addr)->sib_pkey =
3209                                 ((struct sockaddr_ib *) dst_addr)->sib_pkey;
3210                 }
3211         }
3212         return rdma_bind_addr(id, src_addr);
3213 }
3214
3215 int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
3216                       const struct sockaddr *dst_addr, unsigned long timeout_ms)
3217 {
3218         struct rdma_id_private *id_priv;
3219         int ret;
3220
3221         id_priv = container_of(id, struct rdma_id_private, id);
3222         memcpy(cma_dst_addr(id_priv), dst_addr, rdma_addr_size(dst_addr));
3223         if (id_priv->state == RDMA_CM_IDLE) {
3224                 ret = cma_bind_addr(id, src_addr, dst_addr);
3225                 if (ret) {
3226                         memset(cma_dst_addr(id_priv), 0,
3227                                rdma_addr_size(dst_addr));
3228                         return ret;
3229                 }
3230         }
3231
3232         if (cma_family(id_priv) != dst_addr->sa_family) {
3233                 memset(cma_dst_addr(id_priv), 0, rdma_addr_size(dst_addr));
3234                 return -EINVAL;
3235         }
3236
3237         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_ADDR_QUERY)) {
3238                 memset(cma_dst_addr(id_priv), 0, rdma_addr_size(dst_addr));
3239                 return -EINVAL;
3240         }
3241
3242         if (cma_any_addr(dst_addr)) {
3243                 ret = cma_resolve_loopback(id_priv);
3244         } else {
3245                 if (dst_addr->sa_family == AF_IB) {
3246                         ret = cma_resolve_ib_addr(id_priv);
3247                 } else {
3248                         ret = rdma_resolve_ip(cma_src_addr(id_priv), dst_addr,
3249                                               &id->route.addr.dev_addr,
3250                                               timeout_ms, addr_handler,
3251                                               false, id_priv);
3252                 }
3253         }
3254         if (ret)
3255                 goto err;
3256
3257         return 0;
3258 err:
3259         cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY, RDMA_CM_ADDR_BOUND);
3260         return ret;
3261 }
3262 EXPORT_SYMBOL(rdma_resolve_addr);
3263
3264 int rdma_set_reuseaddr(struct rdma_cm_id *id, int reuse)
3265 {
3266         struct rdma_id_private *id_priv;
3267         unsigned long flags;
3268         int ret;
3269
3270         id_priv = container_of(id, struct rdma_id_private, id);
3271         spin_lock_irqsave(&id_priv->lock, flags);
3272         if (reuse || id_priv->state == RDMA_CM_IDLE) {
3273                 id_priv->reuseaddr = reuse;
3274                 ret = 0;
3275         } else {
3276                 ret = -EINVAL;
3277         }
3278         spin_unlock_irqrestore(&id_priv->lock, flags);
3279         return ret;
3280 }
3281 EXPORT_SYMBOL(rdma_set_reuseaddr);
3282
3283 int rdma_set_afonly(struct rdma_cm_id *id, int afonly)
3284 {
3285         struct rdma_id_private *id_priv;
3286         unsigned long flags;
3287         int ret;
3288
3289         id_priv = container_of(id, struct rdma_id_private, id);
3290         spin_lock_irqsave(&id_priv->lock, flags);
3291         if (id_priv->state == RDMA_CM_IDLE || id_priv->state == RDMA_CM_ADDR_BOUND) {
3292                 id_priv->options |= (1 << CMA_OPTION_AFONLY);
3293                 id_priv->afonly = afonly;
3294                 ret = 0;
3295         } else {
3296                 ret = -EINVAL;
3297         }
3298         spin_unlock_irqrestore(&id_priv->lock, flags);
3299         return ret;
3300 }
3301 EXPORT_SYMBOL(rdma_set_afonly);
3302
3303 static void cma_bind_port(struct rdma_bind_list *bind_list,
3304                           struct rdma_id_private *id_priv)
3305 {
3306         struct sockaddr *addr;
3307         struct sockaddr_ib *sib;
3308         u64 sid, mask;
3309         __be16 port;
3310
3311         addr = cma_src_addr(id_priv);
3312         port = htons(bind_list->port);
3313
3314         switch (addr->sa_family) {
3315         case AF_INET:
3316                 ((struct sockaddr_in *) addr)->sin_port = port;
3317                 break;
3318         case AF_INET6:
3319                 ((struct sockaddr_in6 *) addr)->sin6_port = port;
3320                 break;
3321         case AF_IB:
3322                 sib = (struct sockaddr_ib *) addr;
3323                 sid = be64_to_cpu(sib->sib_sid);
3324                 mask = be64_to_cpu(sib->sib_sid_mask);
3325                 sib->sib_sid = cpu_to_be64((sid & mask) | (u64) ntohs(port));
3326                 sib->sib_sid_mask = cpu_to_be64(~0ULL);
3327                 break;
3328         }
3329         id_priv->bind_list = bind_list;
3330         hlist_add_head(&id_priv->node, &bind_list->owners);
3331 }
3332
3333 static int cma_alloc_port(enum rdma_ucm_port_space ps,
3334                           struct rdma_id_private *id_priv, unsigned short snum)
3335 {
3336         struct rdma_bind_list *bind_list;
3337         int ret;
3338
3339         bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL);
3340         if (!bind_list)
3341                 return -ENOMEM;
3342
3343         ret = cma_ps_alloc(id_priv->id.route.addr.dev_addr.net, ps, bind_list,
3344                            snum);
3345         if (ret < 0)
3346                 goto err;
3347
3348         bind_list->ps = ps;
3349         bind_list->port = snum;
3350         cma_bind_port(bind_list, id_priv);
3351         return 0;
3352 err:
3353         kfree(bind_list);
3354         return ret == -ENOSPC ? -EADDRNOTAVAIL : ret;
3355 }
3356
3357 static int cma_port_is_unique(struct rdma_bind_list *bind_list,
3358                               struct rdma_id_private *id_priv)
3359 {
3360         struct rdma_id_private *cur_id;
3361         struct sockaddr  *daddr = cma_dst_addr(id_priv);
3362         struct sockaddr  *saddr = cma_src_addr(id_priv);
3363         __be16 dport = cma_port(daddr);
3364
3365         hlist_for_each_entry(cur_id, &bind_list->owners, node) {
3366                 struct sockaddr  *cur_daddr = cma_dst_addr(cur_id);
3367                 struct sockaddr  *cur_saddr = cma_src_addr(cur_id);
3368                 __be16 cur_dport = cma_port(cur_daddr);
3369
3370                 if (id_priv == cur_id)
3371                         continue;
3372
3373                 /* different dest port -> unique */
3374                 if (!cma_any_port(daddr) &&
3375                     !cma_any_port(cur_daddr) &&
3376                     (dport != cur_dport))
3377                         continue;
3378
3379                 /* different src address -> unique */
3380                 if (!cma_any_addr(saddr) &&
3381                     !cma_any_addr(cur_saddr) &&
3382                     cma_addr_cmp(saddr, cur_saddr))
3383                         continue;
3384
3385                 /* different dst address -> unique */
3386                 if (!cma_any_addr(daddr) &&
3387                     !cma_any_addr(cur_daddr) &&
3388                     cma_addr_cmp(daddr, cur_daddr))
3389                         continue;
3390
3391                 return -EADDRNOTAVAIL;
3392         }
3393         return 0;
3394 }
3395
3396 static int cma_alloc_any_port(enum rdma_ucm_port_space ps,
3397                               struct rdma_id_private *id_priv)
3398 {
3399         static unsigned int last_used_port;
3400         int low, high, remaining;
3401         unsigned int rover;
3402         struct net *net = id_priv->id.route.addr.dev_addr.net;
3403
3404         inet_get_local_port_range(net, &low, &high);
3405         remaining = (high - low) + 1;
3406         rover = prandom_u32() % remaining + low;
3407 retry:
3408         if (last_used_port != rover) {
3409                 struct rdma_bind_list *bind_list;
3410                 int ret;
3411
3412                 bind_list = cma_ps_find(net, ps, (unsigned short)rover);
3413
3414                 if (!bind_list) {
3415                         ret = cma_alloc_port(ps, id_priv, rover);
3416                 } else {
3417                         ret = cma_port_is_unique(bind_list, id_priv);
3418                         if (!ret)
3419                                 cma_bind_port(bind_list, id_priv);
3420                 }
3421                 /*
3422                  * Remember previously used port number in order to avoid
3423                  * re-using same port immediately after it is closed.
3424                  */
3425                 if (!ret)
3426                         last_used_port = rover;
3427                 if (ret != -EADDRNOTAVAIL)
3428                         return ret;
3429         }
3430         if (--remaining) {
3431                 rover++;
3432                 if ((rover < low) || (rover > high))
3433                         rover = low;
3434                 goto retry;
3435         }
3436         return -EADDRNOTAVAIL;
3437 }
3438
3439 /*
3440  * Check that the requested port is available.  This is called when trying to
3441  * bind to a specific port, or when trying to listen on a bound port.  In
3442  * the latter case, the provided id_priv may already be on the bind_list, but
3443  * we still need to check that it's okay to start listening.
3444  */
3445 static int cma_check_port(struct rdma_bind_list *bind_list,
3446                           struct rdma_id_private *id_priv, uint8_t reuseaddr)
3447 {
3448         struct rdma_id_private *cur_id;
3449         struct sockaddr *addr, *cur_addr;
3450
3451         addr = cma_src_addr(id_priv);
3452         hlist_for_each_entry(cur_id, &bind_list->owners, node) {
3453                 if (id_priv == cur_id)
3454                         continue;
3455
3456                 if ((cur_id->state != RDMA_CM_LISTEN) && reuseaddr &&
3457                     cur_id->reuseaddr)
3458                         continue;
3459
3460                 cur_addr = cma_src_addr(cur_id);
3461                 if (id_priv->afonly && cur_id->afonly &&
3462                     (addr->sa_family != cur_addr->sa_family))
3463                         continue;
3464
3465                 if (cma_any_addr(addr) || cma_any_addr(cur_addr))
3466                         return -EADDRNOTAVAIL;
3467
3468                 if (!cma_addr_cmp(addr, cur_addr))
3469                         return -EADDRINUSE;
3470         }
3471         return 0;
3472 }
3473
3474 static int cma_use_port(enum rdma_ucm_port_space ps,
3475                         struct rdma_id_private *id_priv)
3476 {
3477         struct rdma_bind_list *bind_list;
3478         unsigned short snum;
3479         int ret;
3480
3481         snum = ntohs(cma_port(cma_src_addr(id_priv)));
3482         if (snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
3483                 return -EACCES;
3484
3485         bind_list = cma_ps_find(id_priv->id.route.addr.dev_addr.net, ps, snum);
3486         if (!bind_list) {
3487                 ret = cma_alloc_port(ps, id_priv, snum);
3488         } else {
3489                 ret = cma_check_port(bind_list, id_priv, id_priv->reuseaddr);
3490                 if (!ret)
3491                         cma_bind_port(bind_list, id_priv);
3492         }
3493         return ret;
3494 }
3495
3496 static int cma_bind_listen(struct rdma_id_private *id_priv)
3497 {
3498         struct rdma_bind_list *bind_list = id_priv->bind_list;
3499         int ret = 0;
3500
3501         mutex_lock(&lock);
3502         if (bind_list->owners.first->next)
3503                 ret = cma_check_port(bind_list, id_priv, 0);
3504         mutex_unlock(&lock);
3505         return ret;
3506 }
3507
3508 static enum rdma_ucm_port_space
3509 cma_select_inet_ps(struct rdma_id_private *id_priv)
3510 {
3511         switch (id_priv->id.ps) {
3512         case RDMA_PS_TCP:
3513         case RDMA_PS_UDP:
3514         case RDMA_PS_IPOIB:
3515         case RDMA_PS_IB:
3516                 return id_priv->id.ps;
3517         default:
3518
3519                 return 0;
3520         }
3521 }
3522
3523 static enum rdma_ucm_port_space
3524 cma_select_ib_ps(struct rdma_id_private *id_priv)
3525 {
3526         enum rdma_ucm_port_space ps = 0;
3527         struct sockaddr_ib *sib;
3528         u64 sid_ps, mask, sid;
3529
3530         sib = (struct sockaddr_ib *) cma_src_addr(id_priv);
3531         mask = be64_to_cpu(sib->sib_sid_mask) & RDMA_IB_IP_PS_MASK;
3532         sid = be64_to_cpu(sib->sib_sid) & mask;
3533
3534         if ((id_priv->id.ps == RDMA_PS_IB) && (sid == (RDMA_IB_IP_PS_IB & mask))) {
3535                 sid_ps = RDMA_IB_IP_PS_IB;
3536                 ps = RDMA_PS_IB;
3537         } else if (((id_priv->id.ps == RDMA_PS_IB) || (id_priv->id.ps == RDMA_PS_TCP)) &&
3538                    (sid == (RDMA_IB_IP_PS_TCP & mask))) {
3539                 sid_ps = RDMA_IB_IP_PS_TCP;
3540                 ps = RDMA_PS_TCP;
3541         } else if (((id_priv->id.ps == RDMA_PS_IB) || (id_priv->id.ps == RDMA_PS_UDP)) &&
3542                    (sid == (RDMA_IB_IP_PS_UDP & mask))) {
3543                 sid_ps = RDMA_IB_IP_PS_UDP;
3544                 ps = RDMA_PS_UDP;
3545         }
3546
3547         if (ps) {
3548                 sib->sib_sid = cpu_to_be64(sid_ps | ntohs(cma_port((struct sockaddr *) sib)));
3549                 sib->sib_sid_mask = cpu_to_be64(RDMA_IB_IP_PS_MASK |
3550                                                 be64_to_cpu(sib->sib_sid_mask));
3551         }
3552         return ps;
3553 }
3554
3555 static int cma_get_port(struct rdma_id_private *id_priv)
3556 {
3557         enum rdma_ucm_port_space ps;
3558         int ret;
3559
3560         if (cma_family(id_priv) != AF_IB)
3561                 ps = cma_select_inet_ps(id_priv);
3562         else
3563                 ps = cma_select_ib_ps(id_priv);
3564         if (!ps)
3565                 return -EPROTONOSUPPORT;
3566
3567         mutex_lock(&lock);
3568         if (cma_any_port(cma_src_addr(id_priv)))
3569                 ret = cma_alloc_any_port(ps, id_priv);
3570         else
3571                 ret = cma_use_port(ps, id_priv);
3572         mutex_unlock(&lock);
3573
3574         return ret;
3575 }
3576
3577 static int cma_check_linklocal(struct rdma_dev_addr *dev_addr,
3578                                struct sockaddr *addr)
3579 {
3580 #if IS_ENABLED(CONFIG_IPV6)
3581         struct sockaddr_in6 *sin6;
3582
3583         if (addr->sa_family != AF_INET6)
3584                 return 0;
3585
3586         sin6 = (struct sockaddr_in6 *) addr;
3587
3588         if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
3589                 return 0;
3590
3591         if (!sin6->sin6_scope_id)
3592                         return -EINVAL;
3593
3594         dev_addr->bound_dev_if = sin6->sin6_scope_id;
3595 #endif
3596         return 0;
3597 }
3598
3599 int rdma_listen(struct rdma_cm_id *id, int backlog)
3600 {
3601         struct rdma_id_private *id_priv;
3602         int ret;
3603
3604         id_priv = container_of(id, struct rdma_id_private, id);
3605         if (id_priv->state == RDMA_CM_IDLE) {
3606                 id->route.addr.src_addr.ss_family = AF_INET;
3607                 ret = rdma_bind_addr(id, cma_src_addr(id_priv));
3608                 if (ret)
3609                         return ret;
3610         }
3611
3612         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_LISTEN))
3613                 return -EINVAL;
3614
3615         if (id_priv->reuseaddr) {
3616                 ret = cma_bind_listen(id_priv);
3617                 if (ret)
3618                         goto err;
3619         }
3620
3621         id_priv->backlog = backlog;
3622         if (id->device) {
3623                 if (rdma_cap_ib_cm(id->device, 1)) {
3624                         ret = cma_ib_listen(id_priv);
3625                         if (ret)
3626                                 goto err;
3627                 } else if (rdma_cap_iw_cm(id->device, 1)) {
3628                         ret = cma_iw_listen(id_priv, backlog);
3629                         if (ret)
3630                                 goto err;
3631                 } else {
3632                         ret = -ENOSYS;
3633                         goto err;
3634                 }
3635         } else
3636                 cma_listen_on_all(id_priv);
3637
3638         return 0;
3639 err:
3640         id_priv->backlog = 0;
3641         cma_comp_exch(id_priv, RDMA_CM_LISTEN, RDMA_CM_ADDR_BOUND);
3642         return ret;
3643 }
3644 EXPORT_SYMBOL(rdma_listen);
3645
3646 int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr)
3647 {
3648         struct rdma_id_private *id_priv;
3649         int ret;
3650         struct sockaddr  *daddr;
3651
3652         if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6 &&
3653             addr->sa_family != AF_IB)
3654                 return -EAFNOSUPPORT;
3655
3656         id_priv = container_of(id, struct rdma_id_private, id);
3657         if (!cma_comp_exch(id_priv, RDMA_CM_IDLE, RDMA_CM_ADDR_BOUND))
3658                 return -EINVAL;
3659
3660         ret = cma_check_linklocal(&id->route.addr.dev_addr, addr);
3661         if (ret)
3662                 goto err1;
3663
3664         memcpy(cma_src_addr(id_priv), addr, rdma_addr_size(addr));
3665         if (!cma_any_addr(addr)) {
3666                 ret = cma_translate_addr(addr, &id->route.addr.dev_addr);
3667                 if (ret)
3668                         goto err1;
3669
3670                 ret = cma_acquire_dev_by_src_ip(id_priv);
3671                 if (ret)
3672                         goto err1;
3673         }
3674
3675         if (!(id_priv->options & (1 << CMA_OPTION_AFONLY))) {
3676                 if (addr->sa_family == AF_INET)
3677                         id_priv->afonly = 1;
3678 #if IS_ENABLED(CONFIG_IPV6)
3679                 else if (addr->sa_family == AF_INET6) {
3680                         struct net *net = id_priv->id.route.addr.dev_addr.net;
3681
3682                         id_priv->afonly = net->ipv6.sysctl.bindv6only;
3683                 }
3684 #endif
3685         }
3686         daddr = cma_dst_addr(id_priv);
3687         daddr->sa_family = addr->sa_family;
3688
3689         ret = cma_get_port(id_priv);
3690         if (ret)
3691                 goto err2;
3692
3693         return 0;
3694 err2:
3695         rdma_restrack_del(&id_priv->res);
3696         if (id_priv->cma_dev)
3697                 cma_release_dev(id_priv);
3698 err1:
3699         cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_IDLE);
3700         return ret;
3701 }
3702 EXPORT_SYMBOL(rdma_bind_addr);
3703
3704 static int cma_format_hdr(void *hdr, struct rdma_id_private *id_priv)
3705 {
3706         struct cma_hdr *cma_hdr;
3707
3708         cma_hdr = hdr;
3709         cma_hdr->cma_version = CMA_VERSION;
3710         if (cma_family(id_priv) == AF_INET) {
3711                 struct sockaddr_in *src4, *dst4;
3712
3713                 src4 = (struct sockaddr_in *) cma_src_addr(id_priv);
3714                 dst4 = (struct sockaddr_in *) cma_dst_addr(id_priv);
3715
3716                 cma_set_ip_ver(cma_hdr, 4);
3717                 cma_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
3718                 cma_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
3719                 cma_hdr->port = src4->sin_port;
3720         } else if (cma_family(id_priv) == AF_INET6) {
3721                 struct sockaddr_in6 *src6, *dst6;
3722
3723                 src6 = (struct sockaddr_in6 *) cma_src_addr(id_priv);
3724                 dst6 = (struct sockaddr_in6 *) cma_dst_addr(id_priv);
3725
3726                 cma_set_ip_ver(cma_hdr, 6);
3727                 cma_hdr->src_addr.ip6 = src6->sin6_addr;
3728                 cma_hdr->dst_addr.ip6 = dst6->sin6_addr;
3729                 cma_hdr->port = src6->sin6_port;
3730         }
3731         return 0;
3732 }
3733
3734 static int cma_sidr_rep_handler(struct ib_cm_id *cm_id,
3735                                 const struct ib_cm_event *ib_event)
3736 {
3737         struct rdma_id_private *id_priv = cm_id->context;
3738         struct rdma_cm_event event = {};
3739         const struct ib_cm_sidr_rep_event_param *rep =
3740                                 &ib_event->param.sidr_rep_rcvd;
3741         int ret = 0;
3742
3743         mutex_lock(&id_priv->handler_mutex);
3744         if (id_priv->state != RDMA_CM_CONNECT)
3745                 goto out;
3746
3747         switch (ib_event->event) {
3748         case IB_CM_SIDR_REQ_ERROR:
3749                 event.event = RDMA_CM_EVENT_UNREACHABLE;
3750                 event.status = -ETIMEDOUT;
3751                 break;
3752         case IB_CM_SIDR_REP_RECEIVED:
3753                 event.param.ud.private_data = ib_event->private_data;
3754                 event.param.ud.private_data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
3755                 if (rep->status != IB_SIDR_SUCCESS) {
3756                         event.event = RDMA_CM_EVENT_UNREACHABLE;
3757                         event.status = ib_event->param.sidr_rep_rcvd.status;
3758                         pr_debug_ratelimited("RDMA CM: UNREACHABLE: bad SIDR reply. status %d\n",
3759                                              event.status);
3760                         break;
3761                 }
3762                 ret = cma_set_qkey(id_priv, rep->qkey);
3763                 if (ret) {
3764                         pr_debug_ratelimited("RDMA CM: ADDR_ERROR: failed to set qkey. status %d\n", ret);
3765                         event.event = RDMA_CM_EVENT_ADDR_ERROR;
3766                         event.status = ret;
3767                         break;
3768                 }
3769                 ib_init_ah_attr_from_path(id_priv->id.device,
3770                                           id_priv->id.port_num,
3771                                           id_priv->id.route.path_rec,
3772                                           &event.param.ud.ah_attr,
3773                                           rep->sgid_attr);
3774                 event.param.ud.qp_num = rep->qpn;
3775                 event.param.ud.qkey = rep->qkey;
3776                 event.event = RDMA_CM_EVENT_ESTABLISHED;
3777                 event.status = 0;
3778                 break;
3779         default:
3780                 pr_err("RDMA CMA: unexpected IB CM event: %d\n",
3781                        ib_event->event);
3782                 goto out;
3783         }
3784
3785         ret = cma_cm_event_handler(id_priv, &event);
3786
3787         rdma_destroy_ah_attr(&event.param.ud.ah_attr);
3788         if (ret) {
3789                 /* Destroy the CM ID by returning a non-zero value. */
3790                 id_priv->cm_id.ib = NULL;
3791                 cma_exch(id_priv, RDMA_CM_DESTROYING);
3792                 mutex_unlock(&id_priv->handler_mutex);
3793                 rdma_destroy_id(&id_priv->id);
3794                 return ret;
3795         }
3796 out:
3797         mutex_unlock(&id_priv->handler_mutex);
3798         return ret;
3799 }
3800
3801 static int cma_resolve_ib_udp(struct rdma_id_private *id_priv,
3802                               struct rdma_conn_param *conn_param)
3803 {
3804         struct ib_cm_sidr_req_param req;
3805         struct ib_cm_id *id;
3806         void *private_data;
3807         u8 offset;
3808         int ret;
3809
3810         memset(&req, 0, sizeof req);
3811         offset = cma_user_data_offset(id_priv);
3812         req.private_data_len = offset + conn_param->private_data_len;
3813         if (req.private_data_len < conn_param->private_data_len)
3814                 return -EINVAL;
3815
3816         if (req.private_data_len) {
3817                 private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
3818                 if (!private_data)
3819                         return -ENOMEM;
3820         } else {
3821                 private_data = NULL;
3822         }
3823
3824         if (conn_param->private_data && conn_param->private_data_len)
3825                 memcpy(private_data + offset, conn_param->private_data,
3826                        conn_param->private_data_len);
3827
3828         if (private_data) {
3829                 ret = cma_format_hdr(private_data, id_priv);
3830                 if (ret)
3831                         goto out;
3832                 req.private_data = private_data;
3833         }
3834
3835         id = ib_create_cm_id(id_priv->id.device, cma_sidr_rep_handler,
3836                              id_priv);
3837         if (IS_ERR(id)) {
3838                 ret = PTR_ERR(id);
3839                 goto out;
3840         }
3841         id_priv->cm_id.ib = id;
3842
3843         req.path = id_priv->id.route.path_rec;
3844         req.sgid_attr = id_priv->id.route.addr.dev_addr.sgid_attr;
3845         req.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
3846         req.timeout_ms = 1 << (CMA_CM_RESPONSE_TIMEOUT - 8);
3847         req.max_cm_retries = CMA_MAX_CM_RETRIES;
3848
3849         trace_cm_send_sidr_req(id_priv);
3850         ret = ib_send_cm_sidr_req(id_priv->cm_id.ib, &req);
3851         if (ret) {
3852                 ib_destroy_cm_id(id_priv->cm_id.ib);
3853                 id_priv->cm_id.ib = NULL;
3854         }
3855 out:
3856         kfree(private_data);
3857         return ret;
3858 }
3859
3860 static int cma_connect_ib(struct rdma_id_private *id_priv,
3861                           struct rdma_conn_param *conn_param)
3862 {
3863         struct ib_cm_req_param req;
3864         struct rdma_route *route;
3865         void *private_data;
3866         struct ib_cm_id *id;
3867         u8 offset;
3868         int ret;
3869
3870         memset(&req, 0, sizeof req);
3871         offset = cma_user_data_offset(id_priv);
3872         req.private_data_len = offset + conn_param->private_data_len;
3873         if (req.private_data_len < conn_param->private_data_len)
3874                 return -EINVAL;
3875
3876         if (req.private_data_len) {
3877                 private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
3878                 if (!private_data)
3879                         return -ENOMEM;
3880         } else {
3881                 private_data = NULL;
3882         }
3883
3884         if (conn_param->private_data && conn_param->private_data_len)
3885                 memcpy(private_data + offset, conn_param->private_data,
3886                        conn_param->private_data_len);
3887
3888         id = ib_create_cm_id(id_priv->id.device, cma_ib_handler, id_priv);
3889         if (IS_ERR(id)) {
3890                 ret = PTR_ERR(id);
3891                 goto out;
3892         }
3893         id_priv->cm_id.ib = id;
3894
3895         route = &id_priv->id.route;
3896         if (private_data) {
3897                 ret = cma_format_hdr(private_data, id_priv);
3898                 if (ret)
3899                         goto out;
3900                 req.private_data = private_data;
3901         }
3902
3903         req.primary_path = &route->path_rec[0];
3904         if (route->num_paths == 2)
3905                 req.alternate_path = &route->path_rec[1];
3906
3907         req.ppath_sgid_attr = id_priv->id.route.addr.dev_addr.sgid_attr;
3908         /* Alternate path SGID attribute currently unsupported */
3909         req.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
3910         req.qp_num = id_priv->qp_num;
3911         req.qp_type = id_priv->id.qp_type;
3912         req.starting_psn = id_priv->seq_num;
3913         req.responder_resources = conn_param->responder_resources;
3914         req.initiator_depth = conn_param->initiator_depth;
3915         req.flow_control = conn_param->flow_control;
3916         req.retry_count = min_t(u8, 7, conn_param->retry_count);
3917         req.rnr_retry_count = min_t(u8, 7, conn_param->rnr_retry_count);
3918         req.remote_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
3919         req.local_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
3920         req.max_cm_retries = CMA_MAX_CM_RETRIES;
3921         req.srq = id_priv->srq ? 1 : 0;
3922
3923         trace_cm_send_req(id_priv);
3924         ret = ib_send_cm_req(id_priv->cm_id.ib, &req);
3925 out:
3926         if (ret && !IS_ERR(id)) {
3927                 ib_destroy_cm_id(id);
3928                 id_priv->cm_id.ib = NULL;
3929         }
3930
3931         kfree(private_data);
3932         return ret;
3933 }
3934
3935 static int cma_connect_iw(struct rdma_id_private *id_priv,
3936                           struct rdma_conn_param *conn_param)
3937 {
3938         struct iw_cm_id *cm_id;
3939         int ret;
3940         struct iw_cm_conn_param iw_param;
3941
3942         cm_id = iw_create_cm_id(id_priv->id.device, cma_iw_handler, id_priv);
3943         if (IS_ERR(cm_id))
3944                 return PTR_ERR(cm_id);
3945
3946         cm_id->tos = id_priv->tos;
3947         cm_id->tos_set = id_priv->tos_set;
3948         id_priv->cm_id.iw = cm_id;
3949
3950         memcpy(&cm_id->local_addr, cma_src_addr(id_priv),
3951                rdma_addr_size(cma_src_addr(id_priv)));
3952         memcpy(&cm_id->remote_addr, cma_dst_addr(id_priv),
3953                rdma_addr_size(cma_dst_addr(id_priv)));
3954
3955         ret = cma_modify_qp_rtr(id_priv, conn_param);
3956         if (ret)
3957                 goto out;
3958
3959         if (conn_param) {
3960                 iw_param.ord = conn_param->initiator_depth;
3961                 iw_param.ird = conn_param->responder_resources;
3962                 iw_param.private_data = conn_param->private_data;
3963                 iw_param.private_data_len = conn_param->private_data_len;
3964                 iw_param.qpn = id_priv->id.qp ? id_priv->qp_num : conn_param->qp_num;
3965         } else {
3966                 memset(&iw_param, 0, sizeof iw_param);
3967                 iw_param.qpn = id_priv->qp_num;
3968         }
3969         ret = iw_cm_connect(cm_id, &iw_param);
3970 out:
3971         if (ret) {
3972                 iw_destroy_cm_id(cm_id);
3973                 id_priv->cm_id.iw = NULL;
3974         }
3975         return ret;
3976 }
3977
3978 int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
3979 {
3980         struct rdma_id_private *id_priv;
3981         int ret;
3982
3983         id_priv = container_of(id, struct rdma_id_private, id);
3984         if (!cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_CONNECT))
3985                 return -EINVAL;
3986
3987         if (!id->qp) {
3988                 id_priv->qp_num = conn_param->qp_num;
3989                 id_priv->srq = conn_param->srq;
3990         }
3991
3992         if (rdma_cap_ib_cm(id->device, id->port_num)) {
3993                 if (id->qp_type == IB_QPT_UD)
3994                         ret = cma_resolve_ib_udp(id_priv, conn_param);
3995                 else
3996                         ret = cma_connect_ib(id_priv, conn_param);
3997         } else if (rdma_cap_iw_cm(id->device, id->port_num))
3998                 ret = cma_connect_iw(id_priv, conn_param);
3999         else
4000                 ret = -ENOSYS;
4001         if (ret)
4002                 goto err;
4003
4004         return 0;
4005 err:
4006         cma_comp_exch(id_priv, RDMA_CM_CONNECT, RDMA_CM_ROUTE_RESOLVED);
4007         return ret;
4008 }
4009 EXPORT_SYMBOL(rdma_connect);
4010
4011 static int cma_accept_ib(struct rdma_id_private *id_priv,
4012                          struct rdma_conn_param *conn_param)
4013 {
4014         struct ib_cm_rep_param rep;
4015         int ret;
4016
4017         ret = cma_modify_qp_rtr(id_priv, conn_param);
4018         if (ret)
4019                 goto out;
4020
4021         ret = cma_modify_qp_rts(id_priv, conn_param);
4022         if (ret)
4023                 goto out;
4024
4025         memset(&rep, 0, sizeof rep);
4026         rep.qp_num = id_priv->qp_num;
4027         rep.starting_psn = id_priv->seq_num;
4028         rep.private_data = conn_param->private_data;
4029         rep.private_data_len = conn_param->private_data_len;
4030         rep.responder_resources = conn_param->responder_resources;
4031         rep.initiator_depth = conn_param->initiator_depth;
4032         rep.failover_accepted = 0;
4033         rep.flow_control = conn_param->flow_control;
4034         rep.rnr_retry_count = min_t(u8, 7, conn_param->rnr_retry_count);
4035         rep.srq = id_priv->srq ? 1 : 0;
4036
4037         trace_cm_send_rep(id_priv);
4038         ret = ib_send_cm_rep(id_priv->cm_id.ib, &rep);
4039 out:
4040         return ret;
4041 }
4042
4043 static int cma_accept_iw(struct rdma_id_private *id_priv,
4044                   struct rdma_conn_param *conn_param)
4045 {
4046         struct iw_cm_conn_param iw_param;
4047         int ret;
4048
4049         if (!conn_param)
4050                 return -EINVAL;
4051
4052         ret = cma_modify_qp_rtr(id_priv, conn_param);
4053         if (ret)
4054                 return ret;
4055
4056         iw_param.ord = conn_param->initiator_depth;
4057         iw_param.ird = conn_param->responder_resources;
4058         iw_param.private_data = conn_param->private_data;
4059         iw_param.private_data_len = conn_param->private_data_len;
4060         if (id_priv->id.qp) {
4061                 iw_param.qpn = id_priv->qp_num;
4062         } else
4063                 iw_param.qpn = conn_param->qp_num;
4064
4065         return iw_cm_accept(id_priv->cm_id.iw, &iw_param);
4066 }
4067
4068 static int cma_send_sidr_rep(struct rdma_id_private *id_priv,
4069                              enum ib_cm_sidr_status status, u32 qkey,
4070                              const void *private_data, int private_data_len)
4071 {
4072         struct ib_cm_sidr_rep_param rep;
4073         int ret;
4074
4075         memset(&rep, 0, sizeof rep);
4076         rep.status = status;
4077         if (status == IB_SIDR_SUCCESS) {
4078                 ret = cma_set_qkey(id_priv, qkey);
4079                 if (ret)
4080                         return ret;
4081                 rep.qp_num = id_priv->qp_num;
4082                 rep.qkey = id_priv->qkey;
4083         }
4084         rep.private_data = private_data;
4085         rep.private_data_len = private_data_len;
4086
4087         trace_cm_send_sidr_rep(id_priv);
4088         return ib_send_cm_sidr_rep(id_priv->cm_id.ib, &rep);
4089 }
4090
4091 int __rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param,
4092                   const char *caller)
4093 {
4094         struct rdma_id_private *id_priv;
4095         int ret;
4096
4097         id_priv = container_of(id, struct rdma_id_private, id);
4098
4099         rdma_restrack_set_task(&id_priv->res, caller);
4100
4101         if (!cma_comp(id_priv, RDMA_CM_CONNECT))
4102                 return -EINVAL;
4103
4104         if (!id->qp && conn_param) {
4105                 id_priv->qp_num = conn_param->qp_num;
4106                 id_priv->srq = conn_param->srq;
4107         }
4108
4109         if (rdma_cap_ib_cm(id->device, id->port_num)) {
4110                 if (id->qp_type == IB_QPT_UD) {
4111                         if (conn_param)
4112                                 ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
4113                                                         conn_param->qkey,
4114                                                         conn_param->private_data,
4115                                                         conn_param->private_data_len);
4116                         else
4117                                 ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
4118                                                         0, NULL, 0);
4119                 } else {
4120                         if (conn_param)
4121                                 ret = cma_accept_ib(id_priv, conn_param);
4122                         else
4123                                 ret = cma_rep_recv(id_priv);
4124                 }
4125         } else if (rdma_cap_iw_cm(id->device, id->port_num))
4126                 ret = cma_accept_iw(id_priv, conn_param);
4127         else
4128                 ret = -ENOSYS;
4129
4130         if (ret)
4131                 goto reject;
4132
4133         return 0;
4134 reject:
4135         cma_modify_qp_err(id_priv);
4136         rdma_reject(id, NULL, 0);
4137         return ret;
4138 }
4139 EXPORT_SYMBOL(__rdma_accept);
4140
4141 int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event)
4142 {
4143         struct rdma_id_private *id_priv;
4144         int ret;
4145
4146         id_priv = container_of(id, struct rdma_id_private, id);
4147         if (!id_priv->cm_id.ib)
4148                 return -EINVAL;
4149
4150         switch (id->device->node_type) {
4151         case RDMA_NODE_IB_CA:
4152                 ret = ib_cm_notify(id_priv->cm_id.ib, event);
4153                 break;
4154         default:
4155                 ret = 0;
4156                 break;
4157         }
4158         return ret;
4159 }
4160 EXPORT_SYMBOL(rdma_notify);
4161
4162 int rdma_reject(struct rdma_cm_id *id, const void *private_data,
4163                 u8 private_data_len)
4164 {
4165         struct rdma_id_private *id_priv;
4166         int ret;
4167
4168         id_priv = container_of(id, struct rdma_id_private, id);
4169         if (!id_priv->cm_id.ib)
4170                 return -EINVAL;
4171
4172         if (rdma_cap_ib_cm(id->device, id->port_num)) {
4173                 if (id->qp_type == IB_QPT_UD) {
4174                         ret = cma_send_sidr_rep(id_priv, IB_SIDR_REJECT, 0,
4175                                                 private_data, private_data_len);
4176                 } else {
4177                         trace_cm_send_rej(id_priv);
4178                         ret = ib_send_cm_rej(id_priv->cm_id.ib,
4179                                              IB_CM_REJ_CONSUMER_DEFINED, NULL,
4180                                              0, private_data, private_data_len);
4181                 }
4182         } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
4183                 ret = iw_cm_reject(id_priv->cm_id.iw,
4184                                    private_data, private_data_len);
4185         } else
4186                 ret = -ENOSYS;
4187
4188         return ret;
4189 }
4190 EXPORT_SYMBOL(rdma_reject);
4191
4192 int rdma_disconnect(struct rdma_cm_id *id)
4193 {
4194         struct rdma_id_private *id_priv;
4195         int ret;
4196
4197         id_priv = container_of(id, struct rdma_id_private, id);
4198         if (!id_priv->cm_id.ib)
4199                 return -EINVAL;
4200
4201         if (rdma_cap_ib_cm(id->device, id->port_num)) {
4202                 ret = cma_modify_qp_err(id_priv);
4203                 if (ret)
4204                         goto out;
4205                 /* Initiate or respond to a disconnect. */
4206                 trace_cm_disconnect(id_priv);
4207                 if (ib_send_cm_dreq(id_priv->cm_id.ib, NULL, 0)) {
4208                         if (!ib_send_cm_drep(id_priv->cm_id.ib, NULL, 0))
4209                                 trace_cm_sent_drep(id_priv);
4210                 } else {
4211                         trace_cm_sent_dreq(id_priv);
4212                 }
4213         } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
4214                 ret = iw_cm_disconnect(id_priv->cm_id.iw, 0);
4215         } else
4216                 ret = -EINVAL;
4217
4218 out:
4219         return ret;
4220 }
4221 EXPORT_SYMBOL(rdma_disconnect);
4222
4223 static int cma_ib_mc_handler(int status, struct ib_sa_multicast *multicast)
4224 {
4225         struct rdma_id_private *id_priv;
4226         struct cma_multicast *mc = multicast->context;
4227         struct rdma_cm_event event = {};
4228         int ret = 0;
4229
4230         id_priv = mc->id_priv;
4231         mutex_lock(&id_priv->handler_mutex);
4232         if (id_priv->state != RDMA_CM_ADDR_BOUND &&
4233             id_priv->state != RDMA_CM_ADDR_RESOLVED)
4234                 goto out;
4235
4236         if (!status)
4237                 status = cma_set_qkey(id_priv, be32_to_cpu(multicast->rec.qkey));
4238         else
4239                 pr_debug_ratelimited("RDMA CM: MULTICAST_ERROR: failed to join multicast. status %d\n",
4240                                      status);
4241         mutex_lock(&id_priv->qp_mutex);
4242         if (!status && id_priv->id.qp) {
4243                 status = ib_attach_mcast(id_priv->id.qp, &multicast->rec.mgid,
4244                                          be16_to_cpu(multicast->rec.mlid));
4245                 if (status)
4246                         pr_debug_ratelimited("RDMA CM: MULTICAST_ERROR: failed to attach QP. status %d\n",
4247                                              status);
4248         }
4249         mutex_unlock(&id_priv->qp_mutex);
4250
4251         event.status = status;
4252         event.param.ud.private_data = mc->context;
4253         if (!status) {
4254                 struct rdma_dev_addr *dev_addr =
4255                         &id_priv->id.route.addr.dev_addr;
4256                 struct net_device *ndev =
4257                         dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if);
4258                 enum ib_gid_type gid_type =
4259                         id_priv->cma_dev->default_gid_type[id_priv->id.port_num -
4260                         rdma_start_port(id_priv->cma_dev->device)];
4261
4262                 event.event = RDMA_CM_EVENT_MULTICAST_JOIN;
4263                 ret = ib_init_ah_from_mcmember(id_priv->id.device,
4264                                                id_priv->id.port_num,
4265                                                &multicast->rec,
4266                                                ndev, gid_type,
4267                                                &event.param.ud.ah_attr);
4268                 if (ret)
4269                         event.event = RDMA_CM_EVENT_MULTICAST_ERROR;
4270
4271                 event.param.ud.qp_num = 0xFFFFFF;
4272                 event.param.ud.qkey = be32_to_cpu(multicast->rec.qkey);
4273                 if (ndev)
4274                         dev_put(ndev);
4275         } else
4276                 event.event = RDMA_CM_EVENT_MULTICAST_ERROR;
4277
4278         ret = cma_cm_event_handler(id_priv, &event);
4279
4280         rdma_destroy_ah_attr(&event.param.ud.ah_attr);
4281         if (ret) {
4282                 cma_exch(id_priv, RDMA_CM_DESTROYING);
4283                 mutex_unlock(&id_priv->handler_mutex);
4284                 rdma_destroy_id(&id_priv->id);
4285                 return 0;
4286         }
4287
4288 out:
4289         mutex_unlock(&id_priv->handler_mutex);
4290         return 0;
4291 }
4292
4293 static void cma_set_mgid(struct rdma_id_private *id_priv,
4294                          struct sockaddr *addr, union ib_gid *mgid)
4295 {
4296         unsigned char mc_map[MAX_ADDR_LEN];
4297         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
4298         struct sockaddr_in *sin = (struct sockaddr_in *) addr;
4299         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) addr;
4300
4301         if (cma_any_addr(addr)) {
4302                 memset(mgid, 0, sizeof *mgid);
4303         } else if ((addr->sa_family == AF_INET6) &&
4304                    ((be32_to_cpu(sin6->sin6_addr.s6_addr32[0]) & 0xFFF0FFFF) ==
4305                                                                  0xFF10A01B)) {
4306                 /* IPv6 address is an SA assigned MGID. */
4307                 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
4308         } else if (addr->sa_family == AF_IB) {
4309                 memcpy(mgid, &((struct sockaddr_ib *) addr)->sib_addr, sizeof *mgid);
4310         } else if (addr->sa_family == AF_INET6) {
4311                 ipv6_ib_mc_map(&sin6->sin6_addr, dev_addr->broadcast, mc_map);
4312                 if (id_priv->id.ps == RDMA_PS_UDP)
4313                         mc_map[7] = 0x01;       /* Use RDMA CM signature */
4314                 *mgid = *(union ib_gid *) (mc_map + 4);
4315         } else {
4316                 ip_ib_mc_map(sin->sin_addr.s_addr, dev_addr->broadcast, mc_map);
4317                 if (id_priv->id.ps == RDMA_PS_UDP)
4318                         mc_map[7] = 0x01;       /* Use RDMA CM signature */
4319                 *mgid = *(union ib_gid *) (mc_map + 4);
4320         }
4321 }
4322
4323 static int cma_join_ib_multicast(struct rdma_id_private *id_priv,
4324                                  struct cma_multicast *mc)
4325 {
4326         struct ib_sa_mcmember_rec rec;
4327         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
4328         ib_sa_comp_mask comp_mask;
4329         int ret;
4330
4331         ib_addr_get_mgid(dev_addr, &rec.mgid);
4332         ret = ib_sa_get_mcmember_rec(id_priv->id.device, id_priv->id.port_num,
4333                                      &rec.mgid, &rec);
4334         if (ret)
4335                 return ret;
4336
4337         ret = cma_set_qkey(id_priv, 0);
4338         if (ret)
4339                 return ret;
4340
4341         cma_set_mgid(id_priv, (struct sockaddr *) &mc->addr, &rec.mgid);
4342         rec.qkey = cpu_to_be32(id_priv->qkey);
4343         rdma_addr_get_sgid(dev_addr, &rec.port_gid);
4344         rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
4345         rec.join_state = mc->join_state;
4346
4347         if ((rec.join_state == BIT(SENDONLY_FULLMEMBER_JOIN)) &&
4348             (!ib_sa_sendonly_fullmem_support(&sa_client,
4349                                              id_priv->id.device,
4350                                              id_priv->id.port_num))) {
4351                 dev_warn(
4352                         &id_priv->id.device->dev,
4353                         "RDMA CM: port %u Unable to multicast join: SM doesn't support Send Only Full Member option\n",
4354                         id_priv->id.port_num);
4355                 return -EOPNOTSUPP;
4356         }
4357
4358         comp_mask = IB_SA_MCMEMBER_REC_MGID | IB_SA_MCMEMBER_REC_PORT_GID |
4359                     IB_SA_MCMEMBER_REC_PKEY | IB_SA_MCMEMBER_REC_JOIN_STATE |
4360                     IB_SA_MCMEMBER_REC_QKEY | IB_SA_MCMEMBER_REC_SL |
4361                     IB_SA_MCMEMBER_REC_FLOW_LABEL |
4362                     IB_SA_MCMEMBER_REC_TRAFFIC_CLASS;
4363
4364         if (id_priv->id.ps == RDMA_PS_IPOIB)
4365                 comp_mask |= IB_SA_MCMEMBER_REC_RATE |
4366                              IB_SA_MCMEMBER_REC_RATE_SELECTOR |
4367                              IB_SA_MCMEMBER_REC_MTU_SELECTOR |
4368                              IB_SA_MCMEMBER_REC_MTU |
4369                              IB_SA_MCMEMBER_REC_HOP_LIMIT;
4370
4371         mc->multicast.ib = ib_sa_join_multicast(&sa_client, id_priv->id.device,
4372                                                 id_priv->id.port_num, &rec,
4373                                                 comp_mask, GFP_KERNEL,
4374                                                 cma_ib_mc_handler, mc);
4375         return PTR_ERR_OR_ZERO(mc->multicast.ib);
4376 }
4377
4378 static void iboe_mcast_work_handler(struct work_struct *work)
4379 {
4380         struct iboe_mcast_work *mw = container_of(work, struct iboe_mcast_work, work);
4381         struct cma_multicast *mc = mw->mc;
4382         struct ib_sa_multicast *m = mc->multicast.ib;
4383
4384         mc->multicast.ib->context = mc;
4385         cma_ib_mc_handler(0, m);
4386         kref_put(&mc->mcref, release_mc);
4387         kfree(mw);
4388 }
4389
4390 static void cma_iboe_set_mgid(struct sockaddr *addr, union ib_gid *mgid,
4391                               enum ib_gid_type gid_type)
4392 {
4393         struct sockaddr_in *sin = (struct sockaddr_in *)addr;
4394         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr;
4395
4396         if (cma_any_addr(addr)) {
4397                 memset(mgid, 0, sizeof *mgid);
4398         } else if (addr->sa_family == AF_INET6) {
4399                 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
4400         } else {
4401                 mgid->raw[0] =
4402                         (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) ? 0 : 0xff;
4403                 mgid->raw[1] =
4404                         (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) ? 0 : 0x0e;
4405                 mgid->raw[2] = 0;
4406                 mgid->raw[3] = 0;
4407                 mgid->raw[4] = 0;
4408                 mgid->raw[5] = 0;
4409                 mgid->raw[6] = 0;
4410                 mgid->raw[7] = 0;
4411                 mgid->raw[8] = 0;
4412                 mgid->raw[9] = 0;
4413                 mgid->raw[10] = 0xff;
4414                 mgid->raw[11] = 0xff;
4415                 *(__be32 *)(&mgid->raw[12]) = sin->sin_addr.s_addr;
4416         }
4417 }
4418
4419 static int cma_iboe_join_multicast(struct rdma_id_private *id_priv,
4420                                    struct cma_multicast *mc)
4421 {
4422         struct iboe_mcast_work *work;
4423         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
4424         int err = 0;
4425         struct sockaddr *addr = (struct sockaddr *)&mc->addr;
4426         struct net_device *ndev = NULL;
4427         enum ib_gid_type gid_type;
4428         bool send_only;
4429
4430         send_only = mc->join_state == BIT(SENDONLY_FULLMEMBER_JOIN);
4431
4432         if (cma_zero_addr((struct sockaddr *)&mc->addr))
4433                 return -EINVAL;
4434
4435         work = kzalloc(sizeof *work, GFP_KERNEL);
4436         if (!work)
4437                 return -ENOMEM;
4438
4439         mc->multicast.ib = kzalloc(sizeof(struct ib_sa_multicast), GFP_KERNEL);
4440         if (!mc->multicast.ib) {
4441                 err = -ENOMEM;
4442                 goto out1;
4443         }
4444
4445         gid_type = id_priv->cma_dev->default_gid_type[id_priv->id.port_num -
4446                    rdma_start_port(id_priv->cma_dev->device)];
4447         cma_iboe_set_mgid(addr, &mc->multicast.ib->rec.mgid, gid_type);
4448
4449         mc->multicast.ib->rec.pkey = cpu_to_be16(0xffff);
4450         if (id_priv->id.ps == RDMA_PS_UDP)
4451                 mc->multicast.ib->rec.qkey = cpu_to_be32(RDMA_UDP_QKEY);
4452
4453         if (dev_addr->bound_dev_if)
4454                 ndev = dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if);
4455         if (!ndev) {
4456                 err = -ENODEV;
4457                 goto out2;
4458         }
4459         mc->multicast.ib->rec.rate = iboe_get_rate(ndev);
4460         mc->multicast.ib->rec.hop_limit = 1;
4461         mc->multicast.ib->rec.mtu = iboe_get_mtu(ndev->mtu);
4462
4463         if (addr->sa_family == AF_INET) {
4464                 if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) {
4465                         mc->multicast.ib->rec.hop_limit = IPV6_DEFAULT_HOPLIMIT;
4466                         if (!send_only) {
4467                                 err = cma_igmp_send(ndev, &mc->multicast.ib->rec.mgid,
4468                                                     true);
4469                         }
4470                 }
4471         } else {
4472                 if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP)
4473                         err = -ENOTSUPP;
4474         }
4475         dev_put(ndev);
4476         if (err || !mc->multicast.ib->rec.mtu) {
4477                 if (!err)
4478                         err = -EINVAL;
4479                 goto out2;
4480         }
4481         rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
4482                     &mc->multicast.ib->rec.port_gid);
4483         work->id = id_priv;
4484         work->mc = mc;
4485         INIT_WORK(&work->work, iboe_mcast_work_handler);
4486         kref_get(&mc->mcref);
4487         queue_work(cma_wq, &work->work);
4488
4489         return 0;
4490
4491 out2:
4492         kfree(mc->multicast.ib);
4493 out1:
4494         kfree(work);
4495         return err;
4496 }
4497
4498 int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
4499                         u8 join_state, void *context)
4500 {
4501         struct rdma_id_private *id_priv;
4502         struct cma_multicast *mc;
4503         int ret;
4504
4505         if (!id->device)
4506                 return -EINVAL;
4507
4508         id_priv = container_of(id, struct rdma_id_private, id);
4509         if (!cma_comp(id_priv, RDMA_CM_ADDR_BOUND) &&
4510             !cma_comp(id_priv, RDMA_CM_ADDR_RESOLVED))
4511                 return -EINVAL;
4512
4513         mc = kmalloc(sizeof *mc, GFP_KERNEL);
4514         if (!mc)
4515                 return -ENOMEM;
4516
4517         memcpy(&mc->addr, addr, rdma_addr_size(addr));
4518         mc->context = context;
4519         mc->id_priv = id_priv;
4520         mc->join_state = join_state;
4521
4522         if (rdma_protocol_roce(id->device, id->port_num)) {
4523                 kref_init(&mc->mcref);
4524                 ret = cma_iboe_join_multicast(id_priv, mc);
4525                 if (ret)
4526                         goto out_err;
4527         } else if (rdma_cap_ib_mcast(id->device, id->port_num)) {
4528                 ret = cma_join_ib_multicast(id_priv, mc);
4529                 if (ret)
4530                         goto out_err;
4531         } else {
4532                 ret = -ENOSYS;
4533                 goto out_err;
4534         }
4535
4536         spin_lock(&id_priv->lock);
4537         list_add(&mc->list, &id_priv->mc_list);
4538         spin_unlock(&id_priv->lock);
4539
4540         return 0;
4541 out_err:
4542         kfree(mc);
4543         return ret;
4544 }
4545 EXPORT_SYMBOL(rdma_join_multicast);
4546
4547 void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr)
4548 {
4549         struct rdma_id_private *id_priv;
4550         struct cma_multicast *mc;
4551
4552         id_priv = container_of(id, struct rdma_id_private, id);
4553         spin_lock_irq(&id_priv->lock);
4554         list_for_each_entry(mc, &id_priv->mc_list, list) {
4555                 if (!memcmp(&mc->addr, addr, rdma_addr_size(addr))) {
4556                         list_del(&mc->list);
4557                         spin_unlock_irq(&id_priv->lock);
4558
4559                         if (id->qp)
4560                                 ib_detach_mcast(id->qp,
4561                                                 &mc->multicast.ib->rec.mgid,
4562                                                 be16_to_cpu(mc->multicast.ib->rec.mlid));
4563
4564                         BUG_ON(id_priv->cma_dev->device != id->device);
4565
4566                         if (rdma_cap_ib_mcast(id->device, id->port_num)) {
4567                                 ib_sa_free_multicast(mc->multicast.ib);
4568                                 kfree(mc);
4569                         } else if (rdma_protocol_roce(id->device, id->port_num)) {
4570                                 cma_leave_roce_mc_group(id_priv, mc);
4571                         }
4572                         return;
4573                 }
4574         }
4575         spin_unlock_irq(&id_priv->lock);
4576 }
4577 EXPORT_SYMBOL(rdma_leave_multicast);
4578
4579 static int cma_netdev_change(struct net_device *ndev, struct rdma_id_private *id_priv)
4580 {
4581         struct rdma_dev_addr *dev_addr;
4582         struct cma_ndev_work *work;
4583
4584         dev_addr = &id_priv->id.route.addr.dev_addr;
4585
4586         if ((dev_addr->bound_dev_if == ndev->ifindex) &&
4587             (net_eq(dev_net(ndev), dev_addr->net)) &&
4588             memcmp(dev_addr->src_dev_addr, ndev->dev_addr, ndev->addr_len)) {
4589                 pr_info("RDMA CM addr change for ndev %s used by id %p\n",
4590                         ndev->name, &id_priv->id);
4591                 work = kzalloc(sizeof *work, GFP_KERNEL);
4592                 if (!work)
4593                         return -ENOMEM;
4594
4595                 INIT_WORK(&work->work, cma_ndev_work_handler);
4596                 work->id = id_priv;
4597                 work->event.event = RDMA_CM_EVENT_ADDR_CHANGE;
4598                 cma_id_get(id_priv);
4599                 queue_work(cma_wq, &work->work);
4600         }
4601
4602         return 0;
4603 }
4604
4605 static int cma_netdev_callback(struct notifier_block *self, unsigned long event,
4606                                void *ptr)
4607 {
4608         struct net_device *ndev = netdev_notifier_info_to_dev(ptr);
4609         struct cma_device *cma_dev;
4610         struct rdma_id_private *id_priv;
4611         int ret = NOTIFY_DONE;
4612
4613         if (event != NETDEV_BONDING_FAILOVER)
4614                 return NOTIFY_DONE;
4615
4616         if (!netif_is_bond_master(ndev))
4617                 return NOTIFY_DONE;
4618
4619         mutex_lock(&lock);
4620         list_for_each_entry(cma_dev, &dev_list, list)
4621                 list_for_each_entry(id_priv, &cma_dev->id_list, list) {
4622                         ret = cma_netdev_change(ndev, id_priv);
4623                         if (ret)
4624                                 goto out;
4625                 }
4626
4627 out:
4628         mutex_unlock(&lock);
4629         return ret;
4630 }
4631
4632 static struct notifier_block cma_nb = {
4633         .notifier_call = cma_netdev_callback
4634 };
4635
4636 static void cma_add_one(struct ib_device *device)
4637 {
4638         struct cma_device *cma_dev;
4639         struct rdma_id_private *id_priv;
4640         unsigned int i;
4641         unsigned long supported_gids = 0;
4642
4643         cma_dev = kmalloc(sizeof *cma_dev, GFP_KERNEL);
4644         if (!cma_dev)
4645                 return;
4646
4647         cma_dev->device = device;
4648         cma_dev->default_gid_type = kcalloc(device->phys_port_cnt,
4649                                             sizeof(*cma_dev->default_gid_type),
4650                                             GFP_KERNEL);
4651         if (!cma_dev->default_gid_type)
4652                 goto free_cma_dev;
4653
4654         cma_dev->default_roce_tos = kcalloc(device->phys_port_cnt,
4655                                             sizeof(*cma_dev->default_roce_tos),
4656                                             GFP_KERNEL);
4657         if (!cma_dev->default_roce_tos)
4658                 goto free_gid_type;
4659
4660         rdma_for_each_port (device, i) {
4661                 supported_gids = roce_gid_type_mask_support(device, i);
4662                 WARN_ON(!supported_gids);
4663                 if (supported_gids & (1 << CMA_PREFERRED_ROCE_GID_TYPE))
4664                         cma_dev->default_gid_type[i - rdma_start_port(device)] =
4665                                 CMA_PREFERRED_ROCE_GID_TYPE;
4666                 else
4667                         cma_dev->default_gid_type[i - rdma_start_port(device)] =
4668                                 find_first_bit(&supported_gids, BITS_PER_LONG);
4669                 cma_dev->default_roce_tos[i - rdma_start_port(device)] = 0;
4670         }
4671
4672         init_completion(&cma_dev->comp);
4673         refcount_set(&cma_dev->refcount, 1);
4674         INIT_LIST_HEAD(&cma_dev->id_list);
4675         ib_set_client_data(device, &cma_client, cma_dev);
4676
4677         mutex_lock(&lock);
4678         list_add_tail(&cma_dev->list, &dev_list);
4679         list_for_each_entry(id_priv, &listen_any_list, list)
4680                 cma_listen_on_dev(id_priv, cma_dev);
4681         mutex_unlock(&lock);
4682
4683         trace_cm_add_one(device);
4684         return;
4685
4686 free_gid_type:
4687         kfree(cma_dev->default_gid_type);
4688
4689 free_cma_dev:
4690         kfree(cma_dev);
4691
4692         return;
4693 }
4694
4695 static int cma_remove_id_dev(struct rdma_id_private *id_priv)
4696 {
4697         struct rdma_cm_event event = {};
4698         enum rdma_cm_state state;
4699         int ret = 0;
4700
4701         /* Record that we want to remove the device */
4702         state = cma_exch(id_priv, RDMA_CM_DEVICE_REMOVAL);
4703         if (state == RDMA_CM_DESTROYING)
4704                 return 0;
4705
4706         cma_cancel_operation(id_priv, state);
4707         mutex_lock(&id_priv->handler_mutex);
4708
4709         /* Check for destruction from another callback. */
4710         if (!cma_comp(id_priv, RDMA_CM_DEVICE_REMOVAL))
4711                 goto out;
4712
4713         event.event = RDMA_CM_EVENT_DEVICE_REMOVAL;
4714         ret = cma_cm_event_handler(id_priv, &event);
4715 out:
4716         mutex_unlock(&id_priv->handler_mutex);
4717         return ret;
4718 }
4719
4720 static void cma_process_remove(struct cma_device *cma_dev)
4721 {
4722         struct rdma_id_private *id_priv;
4723         int ret;
4724
4725         mutex_lock(&lock);
4726         while (!list_empty(&cma_dev->id_list)) {
4727                 id_priv = list_entry(cma_dev->id_list.next,
4728                                      struct rdma_id_private, list);
4729
4730                 list_del(&id_priv->listen_list);
4731                 list_del_init(&id_priv->list);
4732                 cma_id_get(id_priv);
4733                 mutex_unlock(&lock);
4734
4735                 ret = id_priv->internal_id ? 1 : cma_remove_id_dev(id_priv);
4736                 cma_id_put(id_priv);
4737                 if (ret)
4738                         rdma_destroy_id(&id_priv->id);
4739
4740                 mutex_lock(&lock);
4741         }
4742         mutex_unlock(&lock);
4743
4744         cma_dev_put(cma_dev);
4745         wait_for_completion(&cma_dev->comp);
4746 }
4747
4748 static void cma_remove_one(struct ib_device *device, void *client_data)
4749 {
4750         struct cma_device *cma_dev = client_data;
4751
4752         trace_cm_remove_one(device);
4753
4754         if (!cma_dev)
4755                 return;
4756
4757         mutex_lock(&lock);
4758         list_del(&cma_dev->list);
4759         mutex_unlock(&lock);
4760
4761         cma_process_remove(cma_dev);
4762         kfree(cma_dev->default_roce_tos);
4763         kfree(cma_dev->default_gid_type);
4764         kfree(cma_dev);
4765 }
4766
4767 static int cma_init_net(struct net *net)
4768 {
4769         struct cma_pernet *pernet = cma_pernet(net);
4770
4771         xa_init(&pernet->tcp_ps);
4772         xa_init(&pernet->udp_ps);
4773         xa_init(&pernet->ipoib_ps);
4774         xa_init(&pernet->ib_ps);
4775
4776         return 0;
4777 }
4778
4779 static void cma_exit_net(struct net *net)
4780 {
4781         struct cma_pernet *pernet = cma_pernet(net);
4782
4783         WARN_ON(!xa_empty(&pernet->tcp_ps));
4784         WARN_ON(!xa_empty(&pernet->udp_ps));
4785         WARN_ON(!xa_empty(&pernet->ipoib_ps));
4786         WARN_ON(!xa_empty(&pernet->ib_ps));
4787 }
4788
4789 static struct pernet_operations cma_pernet_operations = {
4790         .init = cma_init_net,
4791         .exit = cma_exit_net,
4792         .id = &cma_pernet_id,
4793         .size = sizeof(struct cma_pernet),
4794 };
4795
4796 static int __init cma_init(void)
4797 {
4798         int ret;
4799
4800         /*
4801          * There is a rare lock ordering dependency in cma_netdev_callback()
4802          * that only happens when bonding is enabled. Teach lockdep that rtnl
4803          * must never be nested under lock so it can find these without having
4804          * to test with bonding.
4805          */
4806         if (IS_ENABLED(CONFIG_LOCKDEP)) {
4807                 rtnl_lock();
4808                 mutex_lock(&lock);
4809                 mutex_unlock(&lock);
4810                 rtnl_unlock();
4811         }
4812
4813         cma_wq = alloc_ordered_workqueue("rdma_cm", WQ_MEM_RECLAIM);
4814         if (!cma_wq)
4815                 return -ENOMEM;
4816
4817         ret = register_pernet_subsys(&cma_pernet_operations);
4818         if (ret)
4819                 goto err_wq;
4820
4821         ib_sa_register_client(&sa_client);
4822         register_netdevice_notifier(&cma_nb);
4823
4824         ret = ib_register_client(&cma_client);
4825         if (ret)
4826                 goto err;
4827
4828         ret = cma_configfs_init();
4829         if (ret)
4830                 goto err_ib;
4831
4832         return 0;
4833
4834 err_ib:
4835         ib_unregister_client(&cma_client);
4836 err:
4837         unregister_netdevice_notifier(&cma_nb);
4838         ib_sa_unregister_client(&sa_client);
4839         unregister_pernet_subsys(&cma_pernet_operations);
4840 err_wq:
4841         destroy_workqueue(cma_wq);
4842         return ret;
4843 }
4844
4845 static void __exit cma_cleanup(void)
4846 {
4847         cma_configfs_exit();
4848         ib_unregister_client(&cma_client);
4849         unregister_netdevice_notifier(&cma_nb);
4850         ib_sa_unregister_client(&sa_client);
4851         unregister_pernet_subsys(&cma_pernet_operations);
4852         destroy_workqueue(cma_wq);
4853 }
4854
4855 module_init(cma_init);
4856 module_exit(cma_cleanup);