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 static void cma_set_mgid(struct rdma_id_private *id_priv, struct sockaddr *addr,
  72                          union ib_gid *mgid);
  73
  74 const char *__attribute_const__ rdma_event_msg(enum rdma_cm_event_type event)
  75 {
  76         size_t index = event;
  77
  78         return (index < ARRAY_SIZE(cma_events) && cma_events[index]) ?
  79                         cma_events[index] : "unrecognized event";
  80 }
  81 EXPORT_SYMBOL(rdma_event_msg);
  82
  83 const char *__attribute_const__ rdma_reject_msg(struct rdma_cm_id *id,
  84                                                 int reason)
  85 {
  86         if (rdma_ib_or_roce(id->device, id->port_num))
  87                 return ibcm_reject_msg(reason);
  88
  89         if (rdma_protocol_iwarp(id->device, id->port_num))
  90                 return iwcm_reject_msg(reason);
  91
  92         WARN_ON_ONCE(1);
  93         return "unrecognized transport";
  94 }
  95 EXPORT_SYMBOL(rdma_reject_msg);
  96
  97 /**
  98  * rdma_is_consumer_reject - return true if the consumer rejected the connect
  99  *                           request.
 100  * @id: Communication identifier that received the REJECT event.
 101  * @reason: Value returned in the REJECT event status field.
 102  */
 103 static bool rdma_is_consumer_reject(struct rdma_cm_id *id, int reason)
 104 {
 105         if (rdma_ib_or_roce(id->device, id->port_num))
 106                 return reason == IB_CM_REJ_CONSUMER_DEFINED;
 107
 108         if (rdma_protocol_iwarp(id->device, id->port_num))
 109                 return reason == -ECONNREFUSED;
 110
 111         WARN_ON_ONCE(1);
 112         return false;
 113 }
 114
 115 const void *rdma_consumer_reject_data(struct rdma_cm_id *id,
 116                                       struct rdma_cm_event *ev, u8 *data_len)
 117 {
 118         const void *p;
 119
 120         if (rdma_is_consumer_reject(id, ev->status)) {
 121                 *data_len = ev->param.conn.private_data_len;
 122                 p = ev->param.conn.private_data;
 123         } else {
 124                 *data_len = 0;
 125                 p = NULL;
 126         }
 127         return p;
 128 }
 129 EXPORT_SYMBOL(rdma_consumer_reject_data);
 130
 131 /**
 132  * rdma_iw_cm_id() - return the iw_cm_id pointer for this cm_id.
 133  * @id: Communication Identifier
 134  */
 135 struct iw_cm_id *rdma_iw_cm_id(struct rdma_cm_id *id)
 136 {
 137         struct rdma_id_private *id_priv;
 138
 139         id_priv = container_of(id, struct rdma_id_private, id);
 140         if (id->device->node_type == RDMA_NODE_RNIC)
 141                 return id_priv->cm_id.iw;
 142         return NULL;
 143 }
 144 EXPORT_SYMBOL(rdma_iw_cm_id);
 145
 146 /**
 147  * rdma_res_to_id() - return the rdma_cm_id pointer for this restrack.
 148  * @res: rdma resource tracking entry pointer
 149  */
 150 struct rdma_cm_id *rdma_res_to_id(struct rdma_restrack_entry *res)
 151 {
 152         struct rdma_id_private *id_priv =
 153                 container_of(res, struct rdma_id_private, res);
 154
 155         return &id_priv->id;
 156 }
 157 EXPORT_SYMBOL(rdma_res_to_id);
 158
 159 static int cma_add_one(struct ib_device *device);
 160 static void cma_remove_one(struct ib_device *device, void *client_data);
 161
 162 static struct ib_client cma_client = {
 163         .name   = "cma",
 164         .add    = cma_add_one,
 165         .remove = cma_remove_one
 166 };
 167
 168 static struct ib_sa_client sa_client;
 169 static LIST_HEAD(dev_list);
 170 static LIST_HEAD(listen_any_list);
 171 static DEFINE_MUTEX(lock);
 172 static struct workqueue_struct *cma_wq;
 173 static unsigned int cma_pernet_id;
 174
 175 struct cma_pernet {
 176         struct xarray tcp_ps;
 177         struct xarray udp_ps;
 178         struct xarray ipoib_ps;
 179         struct xarray ib_ps;
 180 };
 181
 182 static struct cma_pernet *cma_pernet(struct net *net)
 183 {
 184         return net_generic(net, cma_pernet_id);
 185 }
 186
 187 static
 188 struct xarray *cma_pernet_xa(struct net *net, enum rdma_ucm_port_space ps)
 189 {
 190         struct cma_pernet *pernet = cma_pernet(net);
 191
 192         switch (ps) {
 193         case RDMA_PS_TCP:
 194                 return &pernet->tcp_ps;
 195         case RDMA_PS_UDP:
 196                 return &pernet->udp_ps;
 197         case RDMA_PS_IPOIB:
 198                 return &pernet->ipoib_ps;
 199         case RDMA_PS_IB:
 200                 return &pernet->ib_ps;
 201         default:
 202                 return NULL;
 203         }
 204 }
 205
 206 struct cma_device {
 207         struct list_head        list;
 208         struct ib_device        *device;
 209         struct completion       comp;
 210         refcount_t refcount;
 211         struct list_head        id_list;
 212         enum ib_gid_type        *default_gid_type;
 213         u8                      *default_roce_tos;
 214 };
 215
 216 struct rdma_bind_list {
 217         enum rdma_ucm_port_space ps;
 218         struct hlist_head       owners;
 219         unsigned short          port;
 220 };
 221
 222 struct class_port_info_context {
 223         struct ib_class_port_info       *class_port_info;
 224         struct ib_device                *device;
 225         struct completion               done;
 226         struct ib_sa_query              *sa_query;
 227         u8                              port_num;
 228 };
 229
 230 static int cma_ps_alloc(struct net *net, enum rdma_ucm_port_space ps,
 231                         struct rdma_bind_list *bind_list, int snum)
 232 {
 233         struct xarray *xa = cma_pernet_xa(net, ps);
 234
 235         return xa_insert(xa, snum, bind_list, GFP_KERNEL);
 236 }
 237
 238 static struct rdma_bind_list *cma_ps_find(struct net *net,
 239                                           enum rdma_ucm_port_space ps, int snum)
 240 {
 241         struct xarray *xa = cma_pernet_xa(net, ps);
 242
 243         return xa_load(xa, snum);
 244 }
 245
 246 static void cma_ps_remove(struct net *net, enum rdma_ucm_port_space ps,
 247                           int snum)
 248 {
 249         struct xarray *xa = cma_pernet_xa(net, ps);
 250
 251         xa_erase(xa, snum);
 252 }
 253
 254 enum {
 255         CMA_OPTION_AFONLY,
 256 };
 257
 258 void cma_dev_get(struct cma_device *cma_dev)
 259 {
 260         refcount_inc(&cma_dev->refcount);
 261 }
 262
 263 void cma_dev_put(struct cma_device *cma_dev)
 264 {
 265         if (refcount_dec_and_test(&cma_dev->refcount))
 266                 complete(&cma_dev->comp);
 267 }
 268
 269 struct cma_device *cma_enum_devices_by_ibdev(cma_device_filter  filter,
 270                                              void               *cookie)
 271 {
 272         struct cma_device *cma_dev;
 273         struct cma_device *found_cma_dev = NULL;
 274
 275         mutex_lock(&lock);
 276
 277         list_for_each_entry(cma_dev, &dev_list, list)
 278                 if (filter(cma_dev->device, cookie)) {
 279                         found_cma_dev = cma_dev;
 280                         break;
 281                 }
 282
 283         if (found_cma_dev)
 284                 cma_dev_get(found_cma_dev);
 285         mutex_unlock(&lock);
 286         return found_cma_dev;
 287 }
 288
 289 int cma_get_default_gid_type(struct cma_device *cma_dev,
 290                              unsigned int port)
 291 {
 292         if (!rdma_is_port_valid(cma_dev->device, port))
 293                 return -EINVAL;
 294
 295         return cma_dev->default_gid_type[port - rdma_start_port(cma_dev->device)];
 296 }
 297
 298 int cma_set_default_gid_type(struct cma_device *cma_dev,
 299                              unsigned int port,
 300                              enum ib_gid_type default_gid_type)
 301 {
 302         unsigned long supported_gids;
 303
 304         if (!rdma_is_port_valid(cma_dev->device, port))
 305                 return -EINVAL;
 306
 307         if (default_gid_type == IB_GID_TYPE_IB &&
 308             rdma_protocol_roce_eth_encap(cma_dev->device, port))
 309                 default_gid_type = IB_GID_TYPE_ROCE;
 310
 311         supported_gids = roce_gid_type_mask_support(cma_dev->device, port);
 312
 313         if (!(supported_gids & 1 << default_gid_type))
 314                 return -EINVAL;
 315
 316         cma_dev->default_gid_type[port - rdma_start_port(cma_dev->device)] =
 317                 default_gid_type;
 318
 319         return 0;
 320 }
 321
 322 int cma_get_default_roce_tos(struct cma_device *cma_dev, unsigned int port)
 323 {
 324         if (!rdma_is_port_valid(cma_dev->device, port))
 325                 return -EINVAL;
 326
 327         return cma_dev->default_roce_tos[port - rdma_start_port(cma_dev->device)];
 328 }
 329
 330 int cma_set_default_roce_tos(struct cma_device *cma_dev, unsigned int port,
 331                              u8 default_roce_tos)
 332 {
 333         if (!rdma_is_port_valid(cma_dev->device, port))
 334                 return -EINVAL;
 335
 336         cma_dev->default_roce_tos[port - rdma_start_port(cma_dev->device)] =
 337                  default_roce_tos;
 338
 339         return 0;
 340 }
 341 struct ib_device *cma_get_ib_dev(struct cma_device *cma_dev)
 342 {
 343         return cma_dev->device;
 344 }
 345
 346 /*
 347  * Device removal can occur at anytime, so we need extra handling to
 348  * serialize notifying the user of device removal with other callbacks.
 349  * We do this by disabling removal notification while a callback is in process,
 350  * and reporting it after the callback completes.
 351  */
 352
 353 struct cma_multicast {
 354         struct rdma_id_private *id_priv;
 355         struct ib_sa_multicast *sa_mc;
 356         struct list_head        list;
 357         void                    *context;
 358         struct sockaddr_storage addr;
 359         u8                      join_state;
 360 };
 361
 362 struct cma_work {
 363         struct work_struct      work;
 364         struct rdma_id_private  *id;
 365         enum rdma_cm_state      old_state;
 366         enum rdma_cm_state      new_state;
 367         struct rdma_cm_event    event;
 368 };
 369
 370 union cma_ip_addr {
 371         struct in6_addr ip6;
 372         struct {
 373                 __be32 pad[3];
 374                 __be32 addr;
 375         } ip4;
 376 };
 377
 378 struct cma_hdr {
 379         u8 cma_version;
 380         u8 ip_version;  /* IP version: 7:4 */
 381         __be16 port;
 382         union cma_ip_addr src_addr;
 383         union cma_ip_addr dst_addr;
 384 };
 385
 386 #define CMA_VERSION 0x00
 387
 388 struct cma_req_info {
 389         struct sockaddr_storage listen_addr_storage;
 390         struct sockaddr_storage src_addr_storage;
 391         struct ib_device *device;
 392         union ib_gid local_gid;
 393         __be64 service_id;
 394         int port;
 395         bool has_gid;
 396         u16 pkey;
 397 };
 398
 399 static int cma_comp_exch(struct rdma_id_private *id_priv,
 400                          enum rdma_cm_state comp, enum rdma_cm_state exch)
 401 {
 402         unsigned long flags;
 403         int ret;
 404
 405         /*
 406          * The FSM uses a funny double locking where state is protected by both
 407          * the handler_mutex and the spinlock. State is not allowed to change
 408          * to/from a handler_mutex protected value without also holding
 409          * handler_mutex.
 410          */
 411         if (comp == RDMA_CM_CONNECT || exch == RDMA_CM_CONNECT)
 412                 lockdep_assert_held(&id_priv->handler_mutex);
 413
 414         spin_lock_irqsave(&id_priv->lock, flags);
 415         if ((ret = (id_priv->state == comp)))
 416                 id_priv->state = exch;
 417         spin_unlock_irqrestore(&id_priv->lock, flags);
 418         return ret;
 419 }
 420
 421 static inline u8 cma_get_ip_ver(const struct cma_hdr *hdr)
 422 {
 423         return hdr->ip_version >> 4;
 424 }
 425
 426 static inline void cma_set_ip_ver(struct cma_hdr *hdr, u8 ip_ver)
 427 {
 428         hdr->ip_version = (ip_ver << 4) | (hdr->ip_version & 0xF);
 429 }
 430
 431 static int cma_igmp_send(struct net_device *ndev, union ib_gid *mgid, bool join)
 432 {
 433         struct in_device *in_dev = NULL;
 434
 435         if (ndev) {
 436                 rtnl_lock();
 437                 in_dev = __in_dev_get_rtnl(ndev);
 438                 if (in_dev) {
 439                         if (join)
 440                                 ip_mc_inc_group(in_dev,
 441                                                 *(__be32 *)(mgid->raw + 12));
 442                         else
 443                                 ip_mc_dec_group(in_dev,
 444                                                 *(__be32 *)(mgid->raw + 12));
 445                 }
 446                 rtnl_unlock();
 447         }
 448         return (in_dev) ? 0 : -ENODEV;
 449 }
 450
 451 static void _cma_attach_to_dev(struct rdma_id_private *id_priv,
 452                                struct cma_device *cma_dev)
 453 {
 454         cma_dev_get(cma_dev);
 455         id_priv->cma_dev = cma_dev;
 456         id_priv->id.device = cma_dev->device;
 457         id_priv->id.route.addr.dev_addr.transport =
 458                 rdma_node_get_transport(cma_dev->device->node_type);
 459         list_add_tail(&id_priv->list, &cma_dev->id_list);
 460         rdma_restrack_add(&id_priv->res);
 461
 462         trace_cm_id_attach(id_priv, cma_dev->device);
 463 }
 464
 465 static void cma_attach_to_dev(struct rdma_id_private *id_priv,
 466                               struct cma_device *cma_dev)
 467 {
 468         _cma_attach_to_dev(id_priv, cma_dev);
 469         id_priv->gid_type =
 470                 cma_dev->default_gid_type[id_priv->id.port_num -
 471                                           rdma_start_port(cma_dev->device)];
 472 }
 473
 474 static void cma_release_dev(struct rdma_id_private *id_priv)
 475 {
 476         mutex_lock(&lock);
 477         list_del(&id_priv->list);
 478         cma_dev_put(id_priv->cma_dev);
 479         id_priv->cma_dev = NULL;
 480         mutex_unlock(&lock);
 481 }
 482
 483 static inline struct sockaddr *cma_src_addr(struct rdma_id_private *id_priv)
 484 {
 485         return (struct sockaddr *) &id_priv->id.route.addr.src_addr;
 486 }
 487
 488 static inline struct sockaddr *cma_dst_addr(struct rdma_id_private *id_priv)
 489 {
 490         return (struct sockaddr *) &id_priv->id.route.addr.dst_addr;
 491 }
 492
 493 static inline unsigned short cma_family(struct rdma_id_private *id_priv)
 494 {
 495         return id_priv->id.route.addr.src_addr.ss_family;
 496 }
 497
 498 static int cma_set_qkey(struct rdma_id_private *id_priv, u32 qkey)
 499 {
 500         struct ib_sa_mcmember_rec rec;
 501         int ret = 0;
 502
 503         if (id_priv->qkey) {
 504                 if (qkey && id_priv->qkey != qkey)
 505                         return -EINVAL;
 506                 return 0;
 507         }
 508
 509         if (qkey) {
 510                 id_priv->qkey = qkey;
 511                 return 0;
 512         }
 513
 514         switch (id_priv->id.ps) {
 515         case RDMA_PS_UDP:
 516         case RDMA_PS_IB:
 517                 id_priv->qkey = RDMA_UDP_QKEY;
 518                 break;
 519         case RDMA_PS_IPOIB:
 520                 ib_addr_get_mgid(&id_priv->id.route.addr.dev_addr, &rec.mgid);
 521                 ret = ib_sa_get_mcmember_rec(id_priv->id.device,
 522                                              id_priv->id.port_num, &rec.mgid,
 523                                              &rec);
 524                 if (!ret)
 525                         id_priv->qkey = be32_to_cpu(rec.qkey);
 526                 break;
 527         default:
 528                 break;
 529         }
 530         return ret;
 531 }
 532
 533 static void cma_translate_ib(struct sockaddr_ib *sib, struct rdma_dev_addr *dev_addr)
 534 {
 535         dev_addr->dev_type = ARPHRD_INFINIBAND;
 536         rdma_addr_set_sgid(dev_addr, (union ib_gid *) &sib->sib_addr);
 537         ib_addr_set_pkey(dev_addr, ntohs(sib->sib_pkey));
 538 }
 539
 540 static int cma_translate_addr(struct sockaddr *addr, struct rdma_dev_addr *dev_addr)
 541 {
 542         int ret;
 543
 544         if (addr->sa_family != AF_IB) {
 545                 ret = rdma_translate_ip(addr, dev_addr);
 546         } else {
 547                 cma_translate_ib((struct sockaddr_ib *) addr, dev_addr);
 548                 ret = 0;
 549         }
 550
 551         return ret;
 552 }
 553
 554 static const struct ib_gid_attr *
 555 cma_validate_port(struct ib_device *device, u8 port,
 556                   enum ib_gid_type gid_type,
 557                   union ib_gid *gid,
 558                   struct rdma_id_private *id_priv)
 559 {
 560         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
 561         int bound_if_index = dev_addr->bound_dev_if;
 562         const struct ib_gid_attr *sgid_attr;
 563         int dev_type = dev_addr->dev_type;
 564         struct net_device *ndev = NULL;
 565
 566         if (!rdma_dev_access_netns(device, id_priv->id.route.addr.dev_addr.net))
 567                 return ERR_PTR(-ENODEV);
 568
 569         if ((dev_type == ARPHRD_INFINIBAND) && !rdma_protocol_ib(device, port))
 570                 return ERR_PTR(-ENODEV);
 571
 572         if ((dev_type != ARPHRD_INFINIBAND) && rdma_protocol_ib(device, port))
 573                 return ERR_PTR(-ENODEV);
 574
 575         if (dev_type == ARPHRD_ETHER && rdma_protocol_roce(device, port)) {
 576                 ndev = dev_get_by_index(dev_addr->net, bound_if_index);
 577                 if (!ndev)
 578                         return ERR_PTR(-ENODEV);
 579         } else {
 580                 gid_type = IB_GID_TYPE_IB;
 581         }
 582
 583         sgid_attr = rdma_find_gid_by_port(device, gid, gid_type, port, ndev);
 584         if (ndev)
 585                 dev_put(ndev);
 586         return sgid_attr;
 587 }
 588
 589 static void cma_bind_sgid_attr(struct rdma_id_private *id_priv,
 590                                const struct ib_gid_attr *sgid_attr)
 591 {
 592         WARN_ON(id_priv->id.route.addr.dev_addr.sgid_attr);
 593         id_priv->id.route.addr.dev_addr.sgid_attr = sgid_attr;
 594 }
 595
 596 /**
 597  * cma_acquire_dev_by_src_ip - Acquire cma device, port, gid attribute
 598  * based on source ip address.
 599  * @id_priv:    cm_id which should be bound to cma device
 600  *
 601  * cma_acquire_dev_by_src_ip() binds cm id to cma device, port and GID attribute
 602  * based on source IP address. It returns 0 on success or error code otherwise.
 603  * It is applicable to active and passive side cm_id.
 604  */
 605 static int cma_acquire_dev_by_src_ip(struct rdma_id_private *id_priv)
 606 {
 607         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
 608         const struct ib_gid_attr *sgid_attr;
 609         union ib_gid gid, iboe_gid, *gidp;
 610         struct cma_device *cma_dev;
 611         enum ib_gid_type gid_type;
 612         int ret = -ENODEV;
 613         unsigned int port;
 614
 615         if (dev_addr->dev_type != ARPHRD_INFINIBAND &&
 616             id_priv->id.ps == RDMA_PS_IPOIB)
 617                 return -EINVAL;
 618
 619         rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
 620                     &iboe_gid);
 621
 622         memcpy(&gid, dev_addr->src_dev_addr +
 623                rdma_addr_gid_offset(dev_addr), sizeof(gid));
 624
 625         mutex_lock(&lock);
 626         list_for_each_entry(cma_dev, &dev_list, list) {
 627                 rdma_for_each_port (cma_dev->device, port) {
 628                         gidp = rdma_protocol_roce(cma_dev->device, port) ?
 629                                &iboe_gid : &gid;
 630                         gid_type = cma_dev->default_gid_type[port - 1];
 631                         sgid_attr = cma_validate_port(cma_dev->device, port,
 632                                                       gid_type, gidp, id_priv);
 633                         if (!IS_ERR(sgid_attr)) {
 634                                 id_priv->id.port_num = port;
 635                                 cma_bind_sgid_attr(id_priv, sgid_attr);
 636                                 cma_attach_to_dev(id_priv, cma_dev);
 637                                 ret = 0;
 638                                 goto out;
 639                         }
 640                 }
 641         }
 642 out:
 643         mutex_unlock(&lock);
 644         return ret;
 645 }
 646
 647 /**
 648  * cma_ib_acquire_dev - Acquire cma device, port and SGID attribute
 649  * @id_priv:            cm id to bind to cma device
 650  * @listen_id_priv:     listener cm id to match against
 651  * @req:                Pointer to req structure containaining incoming
 652  *                      request information
 653  * cma_ib_acquire_dev() acquires cma device, port and SGID attribute when
 654  * rdma device matches for listen_id and incoming request. It also verifies
 655  * that a GID table entry is present for the source address.
 656  * Returns 0 on success, or returns error code otherwise.
 657  */
 658 static int cma_ib_acquire_dev(struct rdma_id_private *id_priv,
 659                               const struct rdma_id_private *listen_id_priv,
 660                               struct cma_req_info *req)
 661 {
 662         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
 663         const struct ib_gid_attr *sgid_attr;
 664         enum ib_gid_type gid_type;
 665         union ib_gid gid;
 666
 667         if (dev_addr->dev_type != ARPHRD_INFINIBAND &&
 668             id_priv->id.ps == RDMA_PS_IPOIB)
 669                 return -EINVAL;
 670
 671         if (rdma_protocol_roce(req->device, req->port))
 672                 rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
 673                             &gid);
 674         else
 675                 memcpy(&gid, dev_addr->src_dev_addr +
 676                        rdma_addr_gid_offset(dev_addr), sizeof(gid));
 677
 678         gid_type = listen_id_priv->cma_dev->default_gid_type[req->port - 1];
 679         sgid_attr = cma_validate_port(req->device, req->port,
 680                                       gid_type, &gid, id_priv);
 681         if (IS_ERR(sgid_attr))
 682                 return PTR_ERR(sgid_attr);
 683
 684         id_priv->id.port_num = req->port;
 685         cma_bind_sgid_attr(id_priv, sgid_attr);
 686         /* Need to acquire lock to protect against reader
 687          * of cma_dev->id_list such as cma_netdev_callback() and
 688          * cma_process_remove().
 689          */
 690         mutex_lock(&lock);
 691         cma_attach_to_dev(id_priv, listen_id_priv->cma_dev);
 692         mutex_unlock(&lock);
 693         return 0;
 694 }
 695
 696 static int cma_iw_acquire_dev(struct rdma_id_private *id_priv,
 697                               const struct rdma_id_private *listen_id_priv)
 698 {
 699         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
 700         const struct ib_gid_attr *sgid_attr;
 701         struct cma_device *cma_dev;
 702         enum ib_gid_type gid_type;
 703         int ret = -ENODEV;
 704         unsigned int port;
 705         union ib_gid gid;
 706
 707         if (dev_addr->dev_type != ARPHRD_INFINIBAND &&
 708             id_priv->id.ps == RDMA_PS_IPOIB)
 709                 return -EINVAL;
 710
 711         memcpy(&gid, dev_addr->src_dev_addr +
 712                rdma_addr_gid_offset(dev_addr), sizeof(gid));
 713
 714         mutex_lock(&lock);
 715
 716         cma_dev = listen_id_priv->cma_dev;
 717         port = listen_id_priv->id.port_num;
 718         gid_type = listen_id_priv->gid_type;
 719         sgid_attr = cma_validate_port(cma_dev->device, port,
 720                                       gid_type, &gid, id_priv);
 721         if (!IS_ERR(sgid_attr)) {
 722                 id_priv->id.port_num = port;
 723                 cma_bind_sgid_attr(id_priv, sgid_attr);
 724                 ret = 0;
 725                 goto out;
 726         }
 727
 728         list_for_each_entry(cma_dev, &dev_list, list) {
 729                 rdma_for_each_port (cma_dev->device, port) {
 730                         if (listen_id_priv->cma_dev == cma_dev &&
 731                             listen_id_priv->id.port_num == port)
 732                                 continue;
 733
 734                         gid_type = cma_dev->default_gid_type[port - 1];
 735                         sgid_attr = cma_validate_port(cma_dev->device, port,
 736                                                       gid_type, &gid, id_priv);
 737                         if (!IS_ERR(sgid_attr)) {
 738                                 id_priv->id.port_num = port;
 739                                 cma_bind_sgid_attr(id_priv, sgid_attr);
 740                                 ret = 0;
 741                                 goto out;
 742                         }
 743                 }
 744         }
 745
 746 out:
 747         if (!ret)
 748                 cma_attach_to_dev(id_priv, cma_dev);
 749
 750         mutex_unlock(&lock);
 751         return ret;
 752 }
 753
 754 /*
 755  * Select the source IB device and address to reach the destination IB address.
 756  */
 757 static int cma_resolve_ib_dev(struct rdma_id_private *id_priv)
 758 {
 759         struct cma_device *cma_dev, *cur_dev;
 760         struct sockaddr_ib *addr;
 761         union ib_gid gid, sgid, *dgid;
 762         unsigned int p;
 763         u16 pkey, index;
 764         enum ib_port_state port_state;
 765         int i;
 766
 767         cma_dev = NULL;
 768         addr = (struct sockaddr_ib *) cma_dst_addr(id_priv);
 769         dgid = (union ib_gid *) &addr->sib_addr;
 770         pkey = ntohs(addr->sib_pkey);
 771
 772         mutex_lock(&lock);
 773         list_for_each_entry(cur_dev, &dev_list, list) {
 774                 rdma_for_each_port (cur_dev->device, p) {
 775                         if (!rdma_cap_af_ib(cur_dev->device, p))
 776                                 continue;
 777
 778                         if (ib_find_cached_pkey(cur_dev->device, p, pkey, &index))
 779                                 continue;
 780
 781                         if (ib_get_cached_port_state(cur_dev->device, p, &port_state))
 782                                 continue;
 783                         for (i = 0; !rdma_query_gid(cur_dev->device,
 784                                                     p, i, &gid);
 785                              i++) {
 786                                 if (!memcmp(&gid, dgid, sizeof(gid))) {
 787                                         cma_dev = cur_dev;
 788                                         sgid = gid;
 789                                         id_priv->id.port_num = p;
 790                                         goto found;
 791                                 }
 792
 793                                 if (!cma_dev && (gid.global.subnet_prefix ==
 794                                     dgid->global.subnet_prefix) &&
 795                                     port_state == IB_PORT_ACTIVE) {
 796                                         cma_dev = cur_dev;
 797                                         sgid = gid;
 798                                         id_priv->id.port_num = p;
 799                                         goto found;
 800                                 }
 801                         }
 802                 }
 803         }
 804         mutex_unlock(&lock);
 805         return -ENODEV;
 806
 807 found:
 808         cma_attach_to_dev(id_priv, cma_dev);
 809         mutex_unlock(&lock);
 810         addr = (struct sockaddr_ib *)cma_src_addr(id_priv);
 811         memcpy(&addr->sib_addr, &sgid, sizeof(sgid));
 812         cma_translate_ib(addr, &id_priv->id.route.addr.dev_addr);
 813         return 0;
 814 }
 815
 816 static void cma_id_get(struct rdma_id_private *id_priv)
 817 {
 818         refcount_inc(&id_priv->refcount);
 819 }
 820
 821 static void cma_id_put(struct rdma_id_private *id_priv)
 822 {
 823         if (refcount_dec_and_test(&id_priv->refcount))
 824                 complete(&id_priv->comp);
 825 }
 826
 827 static struct rdma_id_private *
 828 __rdma_create_id(struct net *net, rdma_cm_event_handler event_handler,
 829                  void *context, enum rdma_ucm_port_space ps,
 830                  enum ib_qp_type qp_type, const struct rdma_id_private *parent)
 831 {
 832         struct rdma_id_private *id_priv;
 833
 834         id_priv = kzalloc(sizeof *id_priv, GFP_KERNEL);
 835         if (!id_priv)
 836                 return ERR_PTR(-ENOMEM);
 837
 838         id_priv->state = RDMA_CM_IDLE;
 839         id_priv->id.context = context;
 840         id_priv->id.event_handler = event_handler;
 841         id_priv->id.ps = ps;
 842         id_priv->id.qp_type = qp_type;
 843         id_priv->tos_set = false;
 844         id_priv->timeout_set = false;
 845         id_priv->gid_type = IB_GID_TYPE_IB;
 846         spin_lock_init(&id_priv->lock);
 847         mutex_init(&id_priv->qp_mutex);
 848         init_completion(&id_priv->comp);
 849         refcount_set(&id_priv->refcount, 1);
 850         mutex_init(&id_priv->handler_mutex);
 851         INIT_LIST_HEAD(&id_priv->listen_list);
 852         INIT_LIST_HEAD(&id_priv->mc_list);
 853         get_random_bytes(&id_priv->seq_num, sizeof id_priv->seq_num);
 854         id_priv->id.route.addr.dev_addr.net = get_net(net);
 855         id_priv->seq_num &= 0x00ffffff;
 856
 857         rdma_restrack_new(&id_priv->res, RDMA_RESTRACK_CM_ID);
 858         if (parent)
 859                 rdma_restrack_parent_name(&id_priv->res, &parent->res);
 860
 861         return id_priv;
 862 }
 863
 864 struct rdma_cm_id *
 865 __rdma_create_kernel_id(struct net *net, rdma_cm_event_handler event_handler,
 866                         void *context, enum rdma_ucm_port_space ps,
 867                         enum ib_qp_type qp_type, const char *caller)
 868 {
 869         struct rdma_id_private *ret;
 870
 871         ret = __rdma_create_id(net, event_handler, context, ps, qp_type, NULL);
 872         if (IS_ERR(ret))
 873                 return ERR_CAST(ret);
 874
 875         rdma_restrack_set_name(&ret->res, caller);
 876         return &ret->id;
 877 }
 878 EXPORT_SYMBOL(__rdma_create_kernel_id);
 879
 880 struct rdma_cm_id *rdma_create_user_id(rdma_cm_event_handler event_handler,
 881                                        void *context,
 882                                        enum rdma_ucm_port_space ps,
 883                                        enum ib_qp_type qp_type)
 884 {
 885         struct rdma_id_private *ret;
 886
 887         ret = __rdma_create_id(current->nsproxy->net_ns, event_handler, context,
 888                                ps, qp_type, NULL);
 889         if (IS_ERR(ret))
 890                 return ERR_CAST(ret);
 891
 892         rdma_restrack_set_name(&ret->res, NULL);
 893         return &ret->id;
 894 }
 895 EXPORT_SYMBOL(rdma_create_user_id);
 896
 897 static int cma_init_ud_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
 898 {
 899         struct ib_qp_attr qp_attr;
 900         int qp_attr_mask, ret;
 901
 902         qp_attr.qp_state = IB_QPS_INIT;
 903         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 904         if (ret)
 905                 return ret;
 906
 907         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 908         if (ret)
 909                 return ret;
 910
 911         qp_attr.qp_state = IB_QPS_RTR;
 912         ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
 913         if (ret)
 914                 return ret;
 915
 916         qp_attr.qp_state = IB_QPS_RTS;
 917         qp_attr.sq_psn = 0;
 918         ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE | IB_QP_SQ_PSN);
 919
 920         return ret;
 921 }
 922
 923 static int cma_init_conn_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
 924 {
 925         struct ib_qp_attr qp_attr;
 926         int qp_attr_mask, ret;
 927
 928         qp_attr.qp_state = IB_QPS_INIT;
 929         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 930         if (ret)
 931                 return ret;
 932
 933         return ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 934 }
 935
 936 int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
 937                    struct ib_qp_init_attr *qp_init_attr)
 938 {
 939         struct rdma_id_private *id_priv;
 940         struct ib_qp *qp;
 941         int ret;
 942
 943         id_priv = container_of(id, struct rdma_id_private, id);
 944         if (id->device != pd->device) {
 945                 ret = -EINVAL;
 946                 goto out_err;
 947         }
 948
 949         qp_init_attr->port_num = id->port_num;
 950         qp = ib_create_qp(pd, qp_init_attr);
 951         if (IS_ERR(qp)) {
 952                 ret = PTR_ERR(qp);
 953                 goto out_err;
 954         }
 955
 956         if (id->qp_type == IB_QPT_UD)
 957                 ret = cma_init_ud_qp(id_priv, qp);
 958         else
 959                 ret = cma_init_conn_qp(id_priv, qp);
 960         if (ret)
 961                 goto out_destroy;
 962
 963         id->qp = qp;
 964         id_priv->qp_num = qp->qp_num;
 965         id_priv->srq = (qp->srq != NULL);
 966         trace_cm_qp_create(id_priv, pd, qp_init_attr, 0);
 967         return 0;
 968 out_destroy:
 969         ib_destroy_qp(qp);
 970 out_err:
 971         trace_cm_qp_create(id_priv, pd, qp_init_attr, ret);
 972         return ret;
 973 }
 974 EXPORT_SYMBOL(rdma_create_qp);
 975
 976 void rdma_destroy_qp(struct rdma_cm_id *id)
 977 {
 978         struct rdma_id_private *id_priv;
 979
 980         id_priv = container_of(id, struct rdma_id_private, id);
 981         trace_cm_qp_destroy(id_priv);
 982         mutex_lock(&id_priv->qp_mutex);
 983         ib_destroy_qp(id_priv->id.qp);
 984         id_priv->id.qp = NULL;
 985         mutex_unlock(&id_priv->qp_mutex);
 986 }
 987 EXPORT_SYMBOL(rdma_destroy_qp);
 988
 989 static int cma_modify_qp_rtr(struct rdma_id_private *id_priv,
 990                              struct rdma_conn_param *conn_param)
 991 {
 992         struct ib_qp_attr qp_attr;
 993         int qp_attr_mask, ret;
 994
 995         mutex_lock(&id_priv->qp_mutex);
 996         if (!id_priv->id.qp) {
 997                 ret = 0;
 998                 goto out;
 999         }
1000
1001         /* Need to update QP attributes from default values. */
1002         qp_attr.qp_state = IB_QPS_INIT;
1003         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
1004         if (ret)
1005                 goto out;
1006
1007         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
1008         if (ret)
1009                 goto out;
1010
1011         qp_attr.qp_state = IB_QPS_RTR;
1012         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
1013         if (ret)
1014                 goto out;
1015
1016         BUG_ON(id_priv->cma_dev->device != id_priv->id.device);
1017
1018         if (conn_param)
1019                 qp_attr.max_dest_rd_atomic = conn_param->responder_resources;
1020         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
1021 out:
1022         mutex_unlock(&id_priv->qp_mutex);
1023         return ret;
1024 }
1025
1026 static int cma_modify_qp_rts(struct rdma_id_private *id_priv,
1027                              struct rdma_conn_param *conn_param)
1028 {
1029         struct ib_qp_attr qp_attr;
1030         int qp_attr_mask, ret;
1031
1032         mutex_lock(&id_priv->qp_mutex);
1033         if (!id_priv->id.qp) {
1034                 ret = 0;
1035                 goto out;
1036         }
1037
1038         qp_attr.qp_state = IB_QPS_RTS;
1039         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
1040         if (ret)
1041                 goto out;
1042
1043         if (conn_param)
1044                 qp_attr.max_rd_atomic = conn_param->initiator_depth;
1045         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
1046 out:
1047         mutex_unlock(&id_priv->qp_mutex);
1048         return ret;
1049 }
1050
1051 static int cma_modify_qp_err(struct rdma_id_private *id_priv)
1052 {
1053         struct ib_qp_attr qp_attr;
1054         int ret;
1055
1056         mutex_lock(&id_priv->qp_mutex);
1057         if (!id_priv->id.qp) {
1058                 ret = 0;
1059                 goto out;
1060         }
1061
1062         qp_attr.qp_state = IB_QPS_ERR;
1063         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, IB_QP_STATE);
1064 out:
1065         mutex_unlock(&id_priv->qp_mutex);
1066         return ret;
1067 }
1068
1069 static int cma_ib_init_qp_attr(struct rdma_id_private *id_priv,
1070                                struct ib_qp_attr *qp_attr, int *qp_attr_mask)
1071 {
1072         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
1073         int ret;
1074         u16 pkey;
1075
1076         if (rdma_cap_eth_ah(id_priv->id.device, id_priv->id.port_num))
1077                 pkey = 0xffff;
1078         else
1079                 pkey = ib_addr_get_pkey(dev_addr);
1080
1081         ret = ib_find_cached_pkey(id_priv->id.device, id_priv->id.port_num,
1082                                   pkey, &qp_attr->pkey_index);
1083         if (ret)
1084                 return ret;
1085
1086         qp_attr->port_num = id_priv->id.port_num;
1087         *qp_attr_mask = IB_QP_STATE | IB_QP_PKEY_INDEX | IB_QP_PORT;
1088
1089         if (id_priv->id.qp_type == IB_QPT_UD) {
1090                 ret = cma_set_qkey(id_priv, 0);
1091                 if (ret)
1092                         return ret;
1093
1094                 qp_attr->qkey = id_priv->qkey;
1095                 *qp_attr_mask |= IB_QP_QKEY;
1096         } else {
1097                 qp_attr->qp_access_flags = 0;
1098                 *qp_attr_mask |= IB_QP_ACCESS_FLAGS;
1099         }
1100         return 0;
1101 }
1102
1103 int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
1104                        int *qp_attr_mask)
1105 {
1106         struct rdma_id_private *id_priv;
1107         int ret = 0;
1108
1109         id_priv = container_of(id, struct rdma_id_private, id);
1110         if (rdma_cap_ib_cm(id->device, id->port_num)) {
1111                 if (!id_priv->cm_id.ib || (id_priv->id.qp_type == IB_QPT_UD))
1112                         ret = cma_ib_init_qp_attr(id_priv, qp_attr, qp_attr_mask);
1113                 else
1114                         ret = ib_cm_init_qp_attr(id_priv->cm_id.ib, qp_attr,
1115                                                  qp_attr_mask);
1116
1117                 if (qp_attr->qp_state == IB_QPS_RTR)
1118                         qp_attr->rq_psn = id_priv->seq_num;
1119         } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
1120                 if (!id_priv->cm_id.iw) {
1121                         qp_attr->qp_access_flags = 0;
1122                         *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS;
1123                 } else
1124                         ret = iw_cm_init_qp_attr(id_priv->cm_id.iw, qp_attr,
1125                                                  qp_attr_mask);
1126                 qp_attr->port_num = id_priv->id.port_num;
1127                 *qp_attr_mask |= IB_QP_PORT;
1128         } else
1129                 ret = -ENOSYS;
1130
1131         if ((*qp_attr_mask & IB_QP_TIMEOUT) && id_priv->timeout_set)
1132                 qp_attr->timeout = id_priv->timeout;
1133
1134         return ret;
1135 }
1136 EXPORT_SYMBOL(rdma_init_qp_attr);
1137
1138 static inline bool cma_zero_addr(const struct sockaddr *addr)
1139 {
1140         switch (addr->sa_family) {
1141         case AF_INET:
1142                 return ipv4_is_zeronet(((struct sockaddr_in *)addr)->sin_addr.s_addr);
1143         case AF_INET6:
1144                 return ipv6_addr_any(&((struct sockaddr_in6 *)addr)->sin6_addr);
1145         case AF_IB:
1146                 return ib_addr_any(&((struct sockaddr_ib *)addr)->sib_addr);
1147         default:
1148                 return false;
1149         }
1150 }
1151
1152 static inline bool cma_loopback_addr(const struct sockaddr *addr)
1153 {
1154         switch (addr->sa_family) {
1155         case AF_INET:
1156                 return ipv4_is_loopback(
1157                         ((struct sockaddr_in *)addr)->sin_addr.s_addr);
1158         case AF_INET6:
1159                 return ipv6_addr_loopback(
1160                         &((struct sockaddr_in6 *)addr)->sin6_addr);
1161         case AF_IB:
1162                 return ib_addr_loopback(
1163                         &((struct sockaddr_ib *)addr)->sib_addr);
1164         default:
1165                 return false;
1166         }
1167 }
1168
1169 static inline bool cma_any_addr(const struct sockaddr *addr)
1170 {
1171         return cma_zero_addr(addr) || cma_loopback_addr(addr);
1172 }
1173
1174 static int cma_addr_cmp(const struct sockaddr *src, const struct sockaddr *dst)
1175 {
1176         if (src->sa_family != dst->sa_family)
1177                 return -1;
1178
1179         switch (src->sa_family) {
1180         case AF_INET:
1181                 return ((struct sockaddr_in *)src)->sin_addr.s_addr !=
1182                        ((struct sockaddr_in *)dst)->sin_addr.s_addr;
1183         case AF_INET6: {
1184                 struct sockaddr_in6 *src_addr6 = (struct sockaddr_in6 *)src;
1185                 struct sockaddr_in6 *dst_addr6 = (struct sockaddr_in6 *)dst;
1186                 bool link_local;
1187
1188                 if (ipv6_addr_cmp(&src_addr6->sin6_addr,
1189                                           &dst_addr6->sin6_addr))
1190                         return 1;
1191                 link_local = ipv6_addr_type(&dst_addr6->sin6_addr) &
1192                              IPV6_ADDR_LINKLOCAL;
1193                 /* Link local must match their scope_ids */
1194                 return link_local ? (src_addr6->sin6_scope_id !=
1195                                      dst_addr6->sin6_scope_id) :
1196                                     0;
1197         }
1198
1199         default:
1200                 return ib_addr_cmp(&((struct sockaddr_ib *) src)->sib_addr,
1201                                    &((struct sockaddr_ib *) dst)->sib_addr);
1202         }
1203 }
1204
1205 static __be16 cma_port(const struct sockaddr *addr)
1206 {
1207         struct sockaddr_ib *sib;
1208
1209         switch (addr->sa_family) {
1210         case AF_INET:
1211                 return ((struct sockaddr_in *) addr)->sin_port;
1212         case AF_INET6:
1213                 return ((struct sockaddr_in6 *) addr)->sin6_port;
1214         case AF_IB:
1215                 sib = (struct sockaddr_ib *) addr;
1216                 return htons((u16) (be64_to_cpu(sib->sib_sid) &
1217                                     be64_to_cpu(sib->sib_sid_mask)));
1218         default:
1219                 return 0;
1220         }
1221 }
1222
1223 static inline int cma_any_port(const struct sockaddr *addr)
1224 {
1225         return !cma_port(addr);
1226 }
1227
1228 static void cma_save_ib_info(struct sockaddr *src_addr,
1229                              struct sockaddr *dst_addr,
1230                              const struct rdma_cm_id *listen_id,
1231                              const struct sa_path_rec *path)
1232 {
1233         struct sockaddr_ib *listen_ib, *ib;
1234
1235         listen_ib = (struct sockaddr_ib *) &listen_id->route.addr.src_addr;
1236         if (src_addr) {
1237                 ib = (struct sockaddr_ib *)src_addr;
1238                 ib->sib_family = AF_IB;
1239                 if (path) {
1240                         ib->sib_pkey = path->pkey;
1241                         ib->sib_flowinfo = path->flow_label;
1242                         memcpy(&ib->sib_addr, &path->sgid, 16);
1243                         ib->sib_sid = path->service_id;
1244                         ib->sib_scope_id = 0;
1245                 } else {
1246                         ib->sib_pkey = listen_ib->sib_pkey;
1247                         ib->sib_flowinfo = listen_ib->sib_flowinfo;
1248                         ib->sib_addr = listen_ib->sib_addr;
1249                         ib->sib_sid = listen_ib->sib_sid;
1250                         ib->sib_scope_id = listen_ib->sib_scope_id;
1251                 }
1252                 ib->sib_sid_mask = cpu_to_be64(0xffffffffffffffffULL);
1253         }
1254         if (dst_addr) {
1255                 ib = (struct sockaddr_ib *)dst_addr;
1256                 ib->sib_family = AF_IB;
1257                 if (path) {
1258                         ib->sib_pkey = path->pkey;
1259                         ib->sib_flowinfo = path->flow_label;
1260                         memcpy(&ib->sib_addr, &path->dgid, 16);
1261                 }
1262         }
1263 }
1264
1265 static void cma_save_ip4_info(struct sockaddr_in *src_addr,
1266                               struct sockaddr_in *dst_addr,
1267                               struct cma_hdr *hdr,
1268                               __be16 local_port)
1269 {
1270         if (src_addr) {
1271                 *src_addr = (struct sockaddr_in) {
1272                         .sin_family = AF_INET,
1273                         .sin_addr.s_addr = hdr->dst_addr.ip4.addr,
1274                         .sin_port = local_port,
1275                 };
1276         }
1277
1278         if (dst_addr) {
1279                 *dst_addr = (struct sockaddr_in) {
1280                         .sin_family = AF_INET,
1281                         .sin_addr.s_addr = hdr->src_addr.ip4.addr,
1282                         .sin_port = hdr->port,
1283                 };
1284         }
1285 }
1286
1287 static void cma_save_ip6_info(struct sockaddr_in6 *src_addr,
1288                               struct sockaddr_in6 *dst_addr,
1289                               struct cma_hdr *hdr,
1290                               __be16 local_port)
1291 {
1292         if (src_addr) {
1293                 *src_addr = (struct sockaddr_in6) {
1294                         .sin6_family = AF_INET6,
1295                         .sin6_addr = hdr->dst_addr.ip6,
1296                         .sin6_port = local_port,
1297                 };
1298         }
1299
1300         if (dst_addr) {
1301                 *dst_addr = (struct sockaddr_in6) {
1302                         .sin6_family = AF_INET6,
1303                         .sin6_addr = hdr->src_addr.ip6,
1304                         .sin6_port = hdr->port,
1305                 };
1306         }
1307 }
1308
1309 static u16 cma_port_from_service_id(__be64 service_id)
1310 {
1311         return (u16)be64_to_cpu(service_id);
1312 }
1313
1314 static int cma_save_ip_info(struct sockaddr *src_addr,
1315                             struct sockaddr *dst_addr,
1316                             const struct ib_cm_event *ib_event,
1317                             __be64 service_id)
1318 {
1319         struct cma_hdr *hdr;
1320         __be16 port;
1321
1322         hdr = ib_event->private_data;
1323         if (hdr->cma_version != CMA_VERSION)
1324                 return -EINVAL;
1325
1326         port = htons(cma_port_from_service_id(service_id));
1327
1328         switch (cma_get_ip_ver(hdr)) {
1329         case 4:
1330                 cma_save_ip4_info((struct sockaddr_in *)src_addr,
1331                                   (struct sockaddr_in *)dst_addr, hdr, port);
1332                 break;
1333         case 6:
1334                 cma_save_ip6_info((struct sockaddr_in6 *)src_addr,
1335                                   (struct sockaddr_in6 *)dst_addr, hdr, port);
1336                 break;
1337         default:
1338                 return -EAFNOSUPPORT;
1339         }
1340
1341         return 0;
1342 }
1343
1344 static int cma_save_net_info(struct sockaddr *src_addr,
1345                              struct sockaddr *dst_addr,
1346                              const struct rdma_cm_id *listen_id,
1347                              const struct ib_cm_event *ib_event,
1348                              sa_family_t sa_family, __be64 service_id)
1349 {
1350         if (sa_family == AF_IB) {
1351                 if (ib_event->event == IB_CM_REQ_RECEIVED)
1352                         cma_save_ib_info(src_addr, dst_addr, listen_id,
1353                                          ib_event->param.req_rcvd.primary_path);
1354                 else if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED)
1355                         cma_save_ib_info(src_addr, dst_addr, listen_id, NULL);
1356                 return 0;
1357         }
1358
1359         return cma_save_ip_info(src_addr, dst_addr, ib_event, service_id);
1360 }
1361
1362 static int cma_save_req_info(const struct ib_cm_event *ib_event,
1363                              struct cma_req_info *req)
1364 {
1365         const struct ib_cm_req_event_param *req_param =
1366                 &ib_event->param.req_rcvd;
1367         const struct ib_cm_sidr_req_event_param *sidr_param =
1368                 &ib_event->param.sidr_req_rcvd;
1369
1370         switch (ib_event->event) {
1371         case IB_CM_REQ_RECEIVED:
1372                 req->device     = req_param->listen_id->device;
1373                 req->port       = req_param->port;
1374                 memcpy(&req->local_gid, &req_param->primary_path->sgid,
1375                        sizeof(req->local_gid));
1376                 req->has_gid    = true;
1377                 req->service_id = req_param->primary_path->service_id;
1378                 req->pkey       = be16_to_cpu(req_param->primary_path->pkey);
1379                 if (req->pkey != req_param->bth_pkey)
1380                         pr_warn_ratelimited("RDMA CMA: got different BTH P_Key (0x%x) and primary path P_Key (0x%x)\n"
1381                                             "RDMA CMA: in the future this may cause the request to be dropped\n",
1382                                             req_param->bth_pkey, req->pkey);
1383                 break;
1384         case IB_CM_SIDR_REQ_RECEIVED:
1385                 req->device     = sidr_param->listen_id->device;
1386                 req->port       = sidr_param->port;
1387                 req->has_gid    = false;
1388                 req->service_id = sidr_param->service_id;
1389                 req->pkey       = sidr_param->pkey;
1390                 if (req->pkey != sidr_param->bth_pkey)
1391                         pr_warn_ratelimited("RDMA CMA: got different BTH P_Key (0x%x) and SIDR request payload P_Key (0x%x)\n"
1392                                             "RDMA CMA: in the future this may cause the request to be dropped\n",
1393                                             sidr_param->bth_pkey, req->pkey);
1394                 break;
1395         default:
1396                 return -EINVAL;
1397         }
1398
1399         return 0;
1400 }
1401
1402 static bool validate_ipv4_net_dev(struct net_device *net_dev,
1403                                   const struct sockaddr_in *dst_addr,
1404                                   const struct sockaddr_in *src_addr)
1405 {
1406         __be32 daddr = dst_addr->sin_addr.s_addr,
1407                saddr = src_addr->sin_addr.s_addr;
1408         struct fib_result res;
1409         struct flowi4 fl4;
1410         int err;
1411         bool ret;
1412
1413         if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) ||
1414             ipv4_is_lbcast(daddr) || ipv4_is_zeronet(saddr) ||
1415             ipv4_is_zeronet(daddr) || ipv4_is_loopback(daddr) ||
1416             ipv4_is_loopback(saddr))
1417                 return false;
1418
1419         memset(&fl4, 0, sizeof(fl4));
1420         fl4.flowi4_iif = net_dev->ifindex;
1421         fl4.daddr = daddr;
1422         fl4.saddr = saddr;
1423
1424         rcu_read_lock();
1425         err = fib_lookup(dev_net(net_dev), &fl4, &res, 0);
1426         ret = err == 0 && FIB_RES_DEV(res) == net_dev;
1427         rcu_read_unlock();
1428
1429         return ret;
1430 }
1431
1432 static bool validate_ipv6_net_dev(struct net_device *net_dev,
1433                                   const struct sockaddr_in6 *dst_addr,
1434                                   const struct sockaddr_in6 *src_addr)
1435 {
1436 #if IS_ENABLED(CONFIG_IPV6)
1437         const int strict = ipv6_addr_type(&dst_addr->sin6_addr) &
1438                            IPV6_ADDR_LINKLOCAL;
1439         struct rt6_info *rt = rt6_lookup(dev_net(net_dev), &dst_addr->sin6_addr,
1440                                          &src_addr->sin6_addr, net_dev->ifindex,
1441                                          NULL, strict);
1442         bool ret;
1443
1444         if (!rt)
1445                 return false;
1446
1447         ret = rt->rt6i_idev->dev == net_dev;
1448         ip6_rt_put(rt);
1449
1450         return ret;
1451 #else
1452         return false;
1453 #endif
1454 }
1455
1456 static bool validate_net_dev(struct net_device *net_dev,
1457                              const struct sockaddr *daddr,
1458                              const struct sockaddr *saddr)
1459 {
1460         const struct sockaddr_in *daddr4 = (const struct sockaddr_in *)daddr;
1461         const struct sockaddr_in *saddr4 = (const struct sockaddr_in *)saddr;
1462         const struct sockaddr_in6 *daddr6 = (const struct sockaddr_in6 *)daddr;
1463         const struct sockaddr_in6 *saddr6 = (const struct sockaddr_in6 *)saddr;
1464
1465         switch (daddr->sa_family) {
1466         case AF_INET:
1467                 return saddr->sa_family == AF_INET &&
1468                        validate_ipv4_net_dev(net_dev, daddr4, saddr4);
1469
1470         case AF_INET6:
1471                 return saddr->sa_family == AF_INET6 &&
1472                        validate_ipv6_net_dev(net_dev, daddr6, saddr6);
1473
1474         default:
1475                 return false;
1476         }
1477 }
1478
1479 static struct net_device *
1480 roce_get_net_dev_by_cm_event(const struct ib_cm_event *ib_event)
1481 {
1482         const struct ib_gid_attr *sgid_attr = NULL;
1483         struct net_device *ndev;
1484
1485         if (ib_event->event == IB_CM_REQ_RECEIVED)
1486                 sgid_attr = ib_event->param.req_rcvd.ppath_sgid_attr;
1487         else if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED)
1488                 sgid_attr = ib_event->param.sidr_req_rcvd.sgid_attr;
1489
1490         if (!sgid_attr)
1491                 return NULL;
1492
1493         rcu_read_lock();
1494         ndev = rdma_read_gid_attr_ndev_rcu(sgid_attr);
1495         if (IS_ERR(ndev))
1496                 ndev = NULL;
1497         else
1498                 dev_hold(ndev);
1499         rcu_read_unlock();
1500         return ndev;
1501 }
1502
1503 static struct net_device *cma_get_net_dev(const struct ib_cm_event *ib_event,
1504                                           struct cma_req_info *req)
1505 {
1506         struct sockaddr *listen_addr =
1507                         (struct sockaddr *)&req->listen_addr_storage;
1508         struct sockaddr *src_addr = (struct sockaddr *)&req->src_addr_storage;
1509         struct net_device *net_dev;
1510         const union ib_gid *gid = req->has_gid ? &req->local_gid : NULL;
1511         int err;
1512
1513         err = cma_save_ip_info(listen_addr, src_addr, ib_event,
1514                                req->service_id);
1515         if (err)
1516                 return ERR_PTR(err);
1517
1518         if (rdma_protocol_roce(req->device, req->port))
1519                 net_dev = roce_get_net_dev_by_cm_event(ib_event);
1520         else
1521                 net_dev = ib_get_net_dev_by_params(req->device, req->port,
1522                                                    req->pkey,
1523                                                    gid, listen_addr);
1524         if (!net_dev)
1525                 return ERR_PTR(-ENODEV);
1526
1527         return net_dev;
1528 }
1529
1530 static enum rdma_ucm_port_space rdma_ps_from_service_id(__be64 service_id)
1531 {
1532         return (be64_to_cpu(service_id) >> 16) & 0xffff;
1533 }
1534
1535 static bool cma_match_private_data(struct rdma_id_private *id_priv,
1536                                    const struct cma_hdr *hdr)
1537 {
1538         struct sockaddr *addr = cma_src_addr(id_priv);
1539         __be32 ip4_addr;
1540         struct in6_addr ip6_addr;
1541
1542         if (cma_any_addr(addr) && !id_priv->afonly)
1543                 return true;
1544
1545         switch (addr->sa_family) {
1546         case AF_INET:
1547                 ip4_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
1548                 if (cma_get_ip_ver(hdr) != 4)
1549                         return false;
1550                 if (!cma_any_addr(addr) &&
1551                     hdr->dst_addr.ip4.addr != ip4_addr)
1552                         return false;
1553                 break;
1554         case AF_INET6:
1555                 ip6_addr = ((struct sockaddr_in6 *)addr)->sin6_addr;
1556                 if (cma_get_ip_ver(hdr) != 6)
1557                         return false;
1558                 if (!cma_any_addr(addr) &&
1559                     memcmp(&hdr->dst_addr.ip6, &ip6_addr, sizeof(ip6_addr)))
1560                         return false;
1561                 break;
1562         case AF_IB:
1563                 return true;
1564         default:
1565                 return false;
1566         }
1567
1568         return true;
1569 }
1570
1571 static bool cma_protocol_roce(const struct rdma_cm_id *id)
1572 {
1573         struct ib_device *device = id->device;
1574         const int port_num = id->port_num ?: rdma_start_port(device);
1575
1576         return rdma_protocol_roce(device, port_num);
1577 }
1578
1579 static bool cma_is_req_ipv6_ll(const struct cma_req_info *req)
1580 {
1581         const struct sockaddr *daddr =
1582                         (const struct sockaddr *)&req->listen_addr_storage;
1583         const struct sockaddr_in6 *daddr6 = (const struct sockaddr_in6 *)daddr;
1584
1585         /* Returns true if the req is for IPv6 link local */
1586         return (daddr->sa_family == AF_INET6 &&
1587                 (ipv6_addr_type(&daddr6->sin6_addr) & IPV6_ADDR_LINKLOCAL));
1588 }
1589
1590 static bool cma_match_net_dev(const struct rdma_cm_id *id,
1591                               const struct net_device *net_dev,
1592                               const struct cma_req_info *req)
1593 {
1594         const struct rdma_addr *addr = &id->route.addr;
1595
1596         if (!net_dev)
1597                 /* This request is an AF_IB request */
1598                 return (!id->port_num || id->port_num == req->port) &&
1599                        (addr->src_addr.ss_family == AF_IB);
1600
1601         /*
1602          * If the request is not for IPv6 link local, allow matching
1603          * request to any netdevice of the one or multiport rdma device.
1604          */
1605         if (!cma_is_req_ipv6_ll(req))
1606                 return true;
1607         /*
1608          * Net namespaces must match, and if the listner is listening
1609          * on a specific netdevice than netdevice must match as well.
1610          */
1611         if (net_eq(dev_net(net_dev), addr->dev_addr.net) &&
1612             (!!addr->dev_addr.bound_dev_if ==
1613              (addr->dev_addr.bound_dev_if == net_dev->ifindex)))
1614                 return true;
1615         else
1616                 return false;
1617 }
1618
1619 static struct rdma_id_private *cma_find_listener(
1620                 const struct rdma_bind_list *bind_list,
1621                 const struct ib_cm_id *cm_id,
1622                 const struct ib_cm_event *ib_event,
1623                 const struct cma_req_info *req,
1624                 const struct net_device *net_dev)
1625 {
1626         struct rdma_id_private *id_priv, *id_priv_dev;
1627
1628         lockdep_assert_held(&lock);
1629
1630         if (!bind_list)
1631                 return ERR_PTR(-EINVAL);
1632
1633         hlist_for_each_entry(id_priv, &bind_list->owners, node) {
1634                 if (cma_match_private_data(id_priv, ib_event->private_data)) {
1635                         if (id_priv->id.device == cm_id->device &&
1636                             cma_match_net_dev(&id_priv->id, net_dev, req))
1637                                 return id_priv;
1638                         list_for_each_entry(id_priv_dev,
1639                                             &id_priv->listen_list,
1640                                             listen_list) {
1641                                 if (id_priv_dev->id.device == cm_id->device &&
1642                                     cma_match_net_dev(&id_priv_dev->id,
1643                                                       net_dev, req))
1644                                         return id_priv_dev;
1645                         }
1646                 }
1647         }
1648
1649         return ERR_PTR(-EINVAL);
1650 }
1651
1652 static struct rdma_id_private *
1653 cma_ib_id_from_event(struct ib_cm_id *cm_id,
1654                      const struct ib_cm_event *ib_event,
1655                      struct cma_req_info *req,
1656                      struct net_device **net_dev)
1657 {
1658         struct rdma_bind_list *bind_list;
1659         struct rdma_id_private *id_priv;
1660         int err;
1661
1662         err = cma_save_req_info(ib_event, req);
1663         if (err)
1664                 return ERR_PTR(err);
1665
1666         *net_dev = cma_get_net_dev(ib_event, req);
1667         if (IS_ERR(*net_dev)) {
1668                 if (PTR_ERR(*net_dev) == -EAFNOSUPPORT) {
1669                         /* Assuming the protocol is AF_IB */
1670                         *net_dev = NULL;
1671                 } else {
1672                         return ERR_CAST(*net_dev);
1673                 }
1674         }
1675
1676         mutex_lock(&lock);
1677         /*
1678          * Net namespace might be getting deleted while route lookup,
1679          * cm_id lookup is in progress. Therefore, perform netdevice
1680          * validation, cm_id lookup under rcu lock.
1681          * RCU lock along with netdevice state check, synchronizes with
1682          * netdevice migrating to different net namespace and also avoids
1683          * case where net namespace doesn't get deleted while lookup is in
1684          * progress.
1685          * If the device state is not IFF_UP, its properties such as ifindex
1686          * and nd_net cannot be trusted to remain valid without rcu lock.
1687          * net/core/dev.c change_net_namespace() ensures to synchronize with
1688          * ongoing operations on net device after device is closed using
1689          * synchronize_net().
1690          */
1691         rcu_read_lock();
1692         if (*net_dev) {
1693                 /*
1694                  * If netdevice is down, it is likely that it is administratively
1695                  * down or it might be migrating to different namespace.
1696                  * In that case avoid further processing, as the net namespace
1697                  * or ifindex may change.
1698                  */
1699                 if (((*net_dev)->flags & IFF_UP) == 0) {
1700                         id_priv = ERR_PTR(-EHOSTUNREACH);
1701                         goto err;
1702                 }
1703
1704                 if (!validate_net_dev(*net_dev,
1705                                  (struct sockaddr *)&req->listen_addr_storage,
1706                                  (struct sockaddr *)&req->src_addr_storage)) {
1707                         id_priv = ERR_PTR(-EHOSTUNREACH);
1708                         goto err;
1709                 }
1710         }
1711
1712         bind_list = cma_ps_find(*net_dev ? dev_net(*net_dev) : &init_net,
1713                                 rdma_ps_from_service_id(req->service_id),
1714                                 cma_port_from_service_id(req->service_id));
1715         id_priv = cma_find_listener(bind_list, cm_id, ib_event, req, *net_dev);
1716 err:
1717         rcu_read_unlock();
1718         mutex_unlock(&lock);
1719         if (IS_ERR(id_priv) && *net_dev) {
1720                 dev_put(*net_dev);
1721                 *net_dev = NULL;
1722         }
1723         return id_priv;
1724 }
1725
1726 static inline u8 cma_user_data_offset(struct rdma_id_private *id_priv)
1727 {
1728         return cma_family(id_priv) == AF_IB ? 0 : sizeof(struct cma_hdr);
1729 }
1730
1731 static void cma_cancel_route(struct rdma_id_private *id_priv)
1732 {
1733         if (rdma_cap_ib_sa(id_priv->id.device, id_priv->id.port_num)) {
1734                 if (id_priv->query)
1735                         ib_sa_cancel_query(id_priv->query_id, id_priv->query);
1736         }
1737 }
1738
1739 static void cma_cancel_listens(struct rdma_id_private *id_priv)
1740 {
1741         struct rdma_id_private *dev_id_priv;
1742
1743         /*
1744          * Remove from listen_any_list to prevent added devices from spawning
1745          * additional listen requests.
1746          */
1747         mutex_lock(&lock);
1748         list_del(&id_priv->list);
1749
1750         while (!list_empty(&id_priv->listen_list)) {
1751                 dev_id_priv = list_entry(id_priv->listen_list.next,
1752                                          struct rdma_id_private, listen_list);
1753                 /* sync with device removal to avoid duplicate destruction */
1754                 list_del_init(&dev_id_priv->list);
1755                 list_del(&dev_id_priv->listen_list);
1756                 mutex_unlock(&lock);
1757
1758                 rdma_destroy_id(&dev_id_priv->id);
1759                 mutex_lock(&lock);
1760         }
1761         mutex_unlock(&lock);
1762 }
1763
1764 static void cma_cancel_operation(struct rdma_id_private *id_priv,
1765                                  enum rdma_cm_state state)
1766 {
1767         switch (state) {
1768         case RDMA_CM_ADDR_QUERY:
1769                 rdma_addr_cancel(&id_priv->id.route.addr.dev_addr);
1770                 break;
1771         case RDMA_CM_ROUTE_QUERY:
1772                 cma_cancel_route(id_priv);
1773                 break;
1774         case RDMA_CM_LISTEN:
1775                 if (cma_any_addr(cma_src_addr(id_priv)) && !id_priv->cma_dev)
1776                         cma_cancel_listens(id_priv);
1777                 break;
1778         default:
1779                 break;
1780         }
1781 }
1782
1783 static void cma_release_port(struct rdma_id_private *id_priv)
1784 {
1785         struct rdma_bind_list *bind_list = id_priv->bind_list;
1786         struct net *net = id_priv->id.route.addr.dev_addr.net;
1787
1788         if (!bind_list)
1789                 return;
1790
1791         mutex_lock(&lock);
1792         hlist_del(&id_priv->node);
1793         if (hlist_empty(&bind_list->owners)) {
1794                 cma_ps_remove(net, bind_list->ps, bind_list->port);
1795                 kfree(bind_list);
1796         }
1797         mutex_unlock(&lock);
1798 }
1799
1800 static void destroy_mc(struct rdma_id_private *id_priv,
1801                        struct cma_multicast *mc)
1802 {
1803         if (rdma_cap_ib_mcast(id_priv->id.device, id_priv->id.port_num))
1804                 ib_sa_free_multicast(mc->sa_mc);
1805
1806         if (rdma_protocol_roce(id_priv->id.device, id_priv->id.port_num)) {
1807                 struct rdma_dev_addr *dev_addr =
1808                         &id_priv->id.route.addr.dev_addr;
1809                 struct net_device *ndev = NULL;
1810
1811                 if (dev_addr->bound_dev_if)
1812                         ndev = dev_get_by_index(dev_addr->net,
1813                                                 dev_addr->bound_dev_if);
1814                 if (ndev) {
1815                         union ib_gid mgid;
1816
1817                         cma_set_mgid(id_priv, (struct sockaddr *)&mc->addr,
1818                                      &mgid);
1819                         cma_igmp_send(ndev, &mgid, false);
1820                         dev_put(ndev);
1821                 }
1822         }
1823         kfree(mc);
1824 }
1825
1826 static void cma_leave_mc_groups(struct rdma_id_private *id_priv)
1827 {
1828         struct cma_multicast *mc;
1829
1830         while (!list_empty(&id_priv->mc_list)) {
1831                 mc = list_first_entry(&id_priv->mc_list, struct cma_multicast,
1832                                       list);
1833                 list_del(&mc->list);
1834                 destroy_mc(id_priv, mc);
1835         }
1836 }
1837
1838 static void _destroy_id(struct rdma_id_private *id_priv,
1839                         enum rdma_cm_state state)
1840 {
1841         cma_cancel_operation(id_priv, state);
1842
1843         if (id_priv->cma_dev) {
1844                 if (rdma_cap_ib_cm(id_priv->id.device, 1)) {
1845                         if (id_priv->cm_id.ib)
1846                                 ib_destroy_cm_id(id_priv->cm_id.ib);
1847                 } else if (rdma_cap_iw_cm(id_priv->id.device, 1)) {
1848                         if (id_priv->cm_id.iw)
1849                                 iw_destroy_cm_id(id_priv->cm_id.iw);
1850                 }
1851                 cma_leave_mc_groups(id_priv);
1852                 cma_release_dev(id_priv);
1853         }
1854
1855         cma_release_port(id_priv);
1856         cma_id_put(id_priv);
1857         wait_for_completion(&id_priv->comp);
1858
1859         if (id_priv->internal_id)
1860                 cma_id_put(id_priv->id.context);
1861
1862         kfree(id_priv->id.route.path_rec);
1863
1864         if (id_priv->id.route.addr.dev_addr.sgid_attr)
1865                 rdma_put_gid_attr(id_priv->id.route.addr.dev_addr.sgid_attr);
1866
1867         put_net(id_priv->id.route.addr.dev_addr.net);
1868         rdma_restrack_del(&id_priv->res);
1869         kfree(id_priv);
1870 }
1871
1872 /*
1873  * destroy an ID from within the handler_mutex. This ensures that no other
1874  * handlers can start running concurrently.
1875  */
1876 static void destroy_id_handler_unlock(struct rdma_id_private *id_priv)
1877         __releases(&idprv->handler_mutex)
1878 {
1879         enum rdma_cm_state state;
1880         unsigned long flags;
1881
1882         trace_cm_id_destroy(id_priv);
1883
1884         /*
1885          * Setting the state to destroyed under the handler mutex provides a
1886          * fence against calling handler callbacks. If this is invoked due to
1887          * the failure of a handler callback then it guarentees that no future
1888          * handlers will be called.
1889          */
1890         lockdep_assert_held(&id_priv->handler_mutex);
1891         spin_lock_irqsave(&id_priv->lock, flags);
1892         state = id_priv->state;
1893         id_priv->state = RDMA_CM_DESTROYING;
1894         spin_unlock_irqrestore(&id_priv->lock, flags);
1895         mutex_unlock(&id_priv->handler_mutex);
1896         _destroy_id(id_priv, state);
1897 }
1898
1899 void rdma_destroy_id(struct rdma_cm_id *id)
1900 {
1901         struct rdma_id_private *id_priv =
1902                 container_of(id, struct rdma_id_private, id);
1903
1904         mutex_lock(&id_priv->handler_mutex);
1905         destroy_id_handler_unlock(id_priv);
1906 }
1907 EXPORT_SYMBOL(rdma_destroy_id);
1908
1909 static int cma_rep_recv(struct rdma_id_private *id_priv)
1910 {
1911         int ret;
1912
1913         ret = cma_modify_qp_rtr(id_priv, NULL);
1914         if (ret)
1915                 goto reject;
1916
1917         ret = cma_modify_qp_rts(id_priv, NULL);
1918         if (ret)
1919                 goto reject;
1920
1921         trace_cm_send_rtu(id_priv);
1922         ret = ib_send_cm_rtu(id_priv->cm_id.ib, NULL, 0);
1923         if (ret)
1924                 goto reject;
1925
1926         return 0;
1927 reject:
1928         pr_debug_ratelimited("RDMA CM: CONNECT_ERROR: failed to handle reply. status %d\n", ret);
1929         cma_modify_qp_err(id_priv);
1930         trace_cm_send_rej(id_priv);
1931         ib_send_cm_rej(id_priv->cm_id.ib, IB_CM_REJ_CONSUMER_DEFINED,
1932                        NULL, 0, NULL, 0);
1933         return ret;
1934 }
1935
1936 static void cma_set_rep_event_data(struct rdma_cm_event *event,
1937                                    const struct ib_cm_rep_event_param *rep_data,
1938                                    void *private_data)
1939 {
1940         event->param.conn.private_data = private_data;
1941         event->param.conn.private_data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
1942         event->param.conn.responder_resources = rep_data->responder_resources;
1943         event->param.conn.initiator_depth = rep_data->initiator_depth;
1944         event->param.conn.flow_control = rep_data->flow_control;
1945         event->param.conn.rnr_retry_count = rep_data->rnr_retry_count;
1946         event->param.conn.srq = rep_data->srq;
1947         event->param.conn.qp_num = rep_data->remote_qpn;
1948
1949         event->ece.vendor_id = rep_data->ece.vendor_id;
1950         event->ece.attr_mod = rep_data->ece.attr_mod;
1951 }
1952
1953 static int cma_cm_event_handler(struct rdma_id_private *id_priv,
1954                                 struct rdma_cm_event *event)
1955 {
1956         int ret;
1957
1958         lockdep_assert_held(&id_priv->handler_mutex);
1959
1960         trace_cm_event_handler(id_priv, event);
1961         ret = id_priv->id.event_handler(&id_priv->id, event);
1962         trace_cm_event_done(id_priv, event, ret);
1963         return ret;
1964 }
1965
1966 static int cma_ib_handler(struct ib_cm_id *cm_id,
1967                           const struct ib_cm_event *ib_event)
1968 {
1969         struct rdma_id_private *id_priv = cm_id->context;
1970         struct rdma_cm_event event = {};
1971         enum rdma_cm_state state;
1972         int ret;
1973
1974         mutex_lock(&id_priv->handler_mutex);
1975         state = READ_ONCE(id_priv->state);
1976         if ((ib_event->event != IB_CM_TIMEWAIT_EXIT &&
1977              state != RDMA_CM_CONNECT) ||
1978             (ib_event->event == IB_CM_TIMEWAIT_EXIT &&
1979              state != RDMA_CM_DISCONNECT))
1980                 goto out;
1981
1982         switch (ib_event->event) {
1983         case IB_CM_REQ_ERROR:
1984         case IB_CM_REP_ERROR:
1985                 event.event = RDMA_CM_EVENT_UNREACHABLE;
1986                 event.status = -ETIMEDOUT;
1987                 break;
1988         case IB_CM_REP_RECEIVED:
1989                 if (state == RDMA_CM_CONNECT &&
1990                     (id_priv->id.qp_type != IB_QPT_UD)) {
1991                         trace_cm_send_mra(id_priv);
1992                         ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
1993                 }
1994                 if (id_priv->id.qp) {
1995                         event.status = cma_rep_recv(id_priv);
1996                         event.event = event.status ? RDMA_CM_EVENT_CONNECT_ERROR :
1997                                                      RDMA_CM_EVENT_ESTABLISHED;
1998                 } else {
1999                         event.event = RDMA_CM_EVENT_CONNECT_RESPONSE;
2000                 }
2001                 cma_set_rep_event_data(&event, &ib_event->param.rep_rcvd,
2002                                        ib_event->private_data);
2003                 break;
2004         case IB_CM_RTU_RECEIVED:
2005         case IB_CM_USER_ESTABLISHED:
2006                 event.event = RDMA_CM_EVENT_ESTABLISHED;
2007                 break;
2008         case IB_CM_DREQ_ERROR:
2009                 event.status = -ETIMEDOUT;
2010                 fallthrough;
2011         case IB_CM_DREQ_RECEIVED:
2012         case IB_CM_DREP_RECEIVED:
2013                 if (!cma_comp_exch(id_priv, RDMA_CM_CONNECT,
2014                                    RDMA_CM_DISCONNECT))
2015                         goto out;
2016                 event.event = RDMA_CM_EVENT_DISCONNECTED;
2017                 break;
2018         case IB_CM_TIMEWAIT_EXIT:
2019                 event.event = RDMA_CM_EVENT_TIMEWAIT_EXIT;
2020                 break;
2021         case IB_CM_MRA_RECEIVED:
2022                 /* ignore event */
2023                 goto out;
2024         case IB_CM_REJ_RECEIVED:
2025                 pr_debug_ratelimited("RDMA CM: REJECTED: %s\n", rdma_reject_msg(&id_priv->id,
2026                                                                                 ib_event->param.rej_rcvd.reason));
2027                 cma_modify_qp_err(id_priv);
2028                 event.status = ib_event->param.rej_rcvd.reason;
2029                 event.event = RDMA_CM_EVENT_REJECTED;
2030                 event.param.conn.private_data = ib_event->private_data;
2031                 event.param.conn.private_data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
2032                 break;
2033         default:
2034                 pr_err("RDMA CMA: unexpected IB CM event: %d\n",
2035                        ib_event->event);
2036                 goto out;
2037         }
2038
2039         ret = cma_cm_event_handler(id_priv, &event);
2040         if (ret) {
2041                 /* Destroy the CM ID by returning a non-zero value. */
2042                 id_priv->cm_id.ib = NULL;
2043                 destroy_id_handler_unlock(id_priv);
2044                 return ret;
2045         }
2046 out:
2047         mutex_unlock(&id_priv->handler_mutex);
2048         return 0;
2049 }
2050
2051 static struct rdma_id_private *
2052 cma_ib_new_conn_id(const struct rdma_cm_id *listen_id,
2053                    const struct ib_cm_event *ib_event,
2054                    struct net_device *net_dev)
2055 {
2056         struct rdma_id_private *listen_id_priv;
2057         struct rdma_id_private *id_priv;
2058         struct rdma_cm_id *id;
2059         struct rdma_route *rt;
2060         const sa_family_t ss_family = listen_id->route.addr.src_addr.ss_family;
2061         struct sa_path_rec *path = ib_event->param.req_rcvd.primary_path;
2062         const __be64 service_id =
2063                 ib_event->param.req_rcvd.primary_path->service_id;
2064         int ret;
2065
2066         listen_id_priv = container_of(listen_id, struct rdma_id_private, id);
2067         id_priv = __rdma_create_id(listen_id->route.addr.dev_addr.net,
2068                                    listen_id->event_handler, listen_id->context,
2069                                    listen_id->ps,
2070                                    ib_event->param.req_rcvd.qp_type,
2071                                    listen_id_priv);
2072         if (IS_ERR(id_priv))
2073                 return NULL;
2074
2075         id = &id_priv->id;
2076         if (cma_save_net_info((struct sockaddr *)&id->route.addr.src_addr,
2077                               (struct sockaddr *)&id->route.addr.dst_addr,
2078                               listen_id, ib_event, ss_family, service_id))
2079                 goto err;
2080
2081         rt = &id->route;
2082         rt->num_paths = ib_event->param.req_rcvd.alternate_path ? 2 : 1;
2083         rt->path_rec = kmalloc_array(rt->num_paths, sizeof(*rt->path_rec),
2084                                      GFP_KERNEL);
2085         if (!rt->path_rec)
2086                 goto err;
2087
2088         rt->path_rec[0] = *path;
2089         if (rt->num_paths == 2)
2090                 rt->path_rec[1] = *ib_event->param.req_rcvd.alternate_path;
2091
2092         if (net_dev) {
2093                 rdma_copy_src_l2_addr(&rt->addr.dev_addr, net_dev);
2094         } else {
2095                 if (!cma_protocol_roce(listen_id) &&
2096                     cma_any_addr(cma_src_addr(id_priv))) {
2097                         rt->addr.dev_addr.dev_type = ARPHRD_INFINIBAND;
2098                         rdma_addr_set_sgid(&rt->addr.dev_addr, &rt->path_rec[0].sgid);
2099                         ib_addr_set_pkey(&rt->addr.dev_addr, be16_to_cpu(rt->path_rec[0].pkey));
2100                 } else if (!cma_any_addr(cma_src_addr(id_priv))) {
2101                         ret = cma_translate_addr(cma_src_addr(id_priv), &rt->addr.dev_addr);
2102                         if (ret)
2103                                 goto err;
2104                 }
2105         }
2106         rdma_addr_set_dgid(&rt->addr.dev_addr, &rt->path_rec[0].dgid);
2107
2108         id_priv->state = RDMA_CM_CONNECT;
2109         return id_priv;
2110
2111 err:
2112         rdma_destroy_id(id);
2113         return NULL;
2114 }
2115
2116 static struct rdma_id_private *
2117 cma_ib_new_udp_id(const struct rdma_cm_id *listen_id,
2118                   const struct ib_cm_event *ib_event,
2119                   struct net_device *net_dev)
2120 {
2121         const struct rdma_id_private *listen_id_priv;
2122         struct rdma_id_private *id_priv;
2123         struct rdma_cm_id *id;
2124         const sa_family_t ss_family = listen_id->route.addr.src_addr.ss_family;
2125         struct net *net = listen_id->route.addr.dev_addr.net;
2126         int ret;
2127
2128         listen_id_priv = container_of(listen_id, struct rdma_id_private, id);
2129         id_priv = __rdma_create_id(net, listen_id->event_handler,
2130                                    listen_id->context, listen_id->ps, IB_QPT_UD,
2131                                    listen_id_priv);
2132         if (IS_ERR(id_priv))
2133                 return NULL;
2134
2135         id = &id_priv->id;
2136         if (cma_save_net_info((struct sockaddr *)&id->route.addr.src_addr,
2137                               (struct sockaddr *)&id->route.addr.dst_addr,
2138                               listen_id, ib_event, ss_family,
2139                               ib_event->param.sidr_req_rcvd.service_id))
2140                 goto err;
2141
2142         if (net_dev) {
2143                 rdma_copy_src_l2_addr(&id->route.addr.dev_addr, net_dev);
2144         } else {
2145                 if (!cma_any_addr(cma_src_addr(id_priv))) {
2146                         ret = cma_translate_addr(cma_src_addr(id_priv),
2147                                                  &id->route.addr.dev_addr);
2148                         if (ret)
2149                                 goto err;
2150                 }
2151         }
2152
2153         id_priv->state = RDMA_CM_CONNECT;
2154         return id_priv;
2155 err:
2156         rdma_destroy_id(id);
2157         return NULL;
2158 }
2159
2160 static void cma_set_req_event_data(struct rdma_cm_event *event,
2161                                    const struct ib_cm_req_event_param *req_data,
2162                                    void *private_data, int offset)
2163 {
2164         event->param.conn.private_data = private_data + offset;
2165         event->param.conn.private_data_len = IB_CM_REQ_PRIVATE_DATA_SIZE - offset;
2166         event->param.conn.responder_resources = req_data->responder_resources;
2167         event->param.conn.initiator_depth = req_data->initiator_depth;
2168         event->param.conn.flow_control = req_data->flow_control;
2169         event->param.conn.retry_count = req_data->retry_count;
2170         event->param.conn.rnr_retry_count = req_data->rnr_retry_count;
2171         event->param.conn.srq = req_data->srq;
2172         event->param.conn.qp_num = req_data->remote_qpn;
2173
2174         event->ece.vendor_id = req_data->ece.vendor_id;
2175         event->ece.attr_mod = req_data->ece.attr_mod;
2176 }
2177
2178 static int cma_ib_check_req_qp_type(const struct rdma_cm_id *id,
2179                                     const struct ib_cm_event *ib_event)
2180 {
2181         return (((ib_event->event == IB_CM_REQ_RECEIVED) &&
2182                  (ib_event->param.req_rcvd.qp_type == id->qp_type)) ||
2183                 ((ib_event->event == IB_CM_SIDR_REQ_RECEIVED) &&
2184                  (id->qp_type == IB_QPT_UD)) ||
2185                 (!id->qp_type));
2186 }
2187
2188 static int cma_ib_req_handler(struct ib_cm_id *cm_id,
2189                               const struct ib_cm_event *ib_event)
2190 {
2191         struct rdma_id_private *listen_id, *conn_id = NULL;
2192         struct rdma_cm_event event = {};
2193         struct cma_req_info req = {};
2194         struct net_device *net_dev;
2195         u8 offset;
2196         int ret;
2197
2198         listen_id = cma_ib_id_from_event(cm_id, ib_event, &req, &net_dev);
2199         if (IS_ERR(listen_id))
2200                 return PTR_ERR(listen_id);
2201
2202         trace_cm_req_handler(listen_id, ib_event->event);
2203         if (!cma_ib_check_req_qp_type(&listen_id->id, ib_event)) {
2204                 ret = -EINVAL;
2205                 goto net_dev_put;
2206         }
2207
2208         mutex_lock(&listen_id->handler_mutex);
2209         if (READ_ONCE(listen_id->state) != RDMA_CM_LISTEN) {
2210                 ret = -ECONNABORTED;
2211                 goto err_unlock;
2212         }
2213
2214         offset = cma_user_data_offset(listen_id);
2215         event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
2216         if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED) {
2217                 conn_id = cma_ib_new_udp_id(&listen_id->id, ib_event, net_dev);
2218                 event.param.ud.private_data = ib_event->private_data + offset;
2219                 event.param.ud.private_data_len =
2220                                 IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE - offset;
2221         } else {
2222                 conn_id = cma_ib_new_conn_id(&listen_id->id, ib_event, net_dev);
2223                 cma_set_req_event_data(&event, &ib_event->param.req_rcvd,
2224                                        ib_event->private_data, offset);
2225         }
2226         if (!conn_id) {
2227                 ret = -ENOMEM;
2228                 goto err_unlock;
2229         }
2230
2231         mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
2232         ret = cma_ib_acquire_dev(conn_id, listen_id, &req);
2233         if (ret) {
2234                 destroy_id_handler_unlock(conn_id);
2235                 goto err_unlock;
2236         }
2237
2238         conn_id->cm_id.ib = cm_id;
2239         cm_id->context = conn_id;
2240         cm_id->cm_handler = cma_ib_handler;
2241
2242         ret = cma_cm_event_handler(conn_id, &event);
2243         if (ret) {
2244                 /* Destroy the CM ID by returning a non-zero value. */
2245                 conn_id->cm_id.ib = NULL;
2246                 mutex_unlock(&listen_id->handler_mutex);
2247                 destroy_id_handler_unlock(conn_id);
2248                 goto net_dev_put;
2249         }
2250
2251         if (READ_ONCE(conn_id->state) == RDMA_CM_CONNECT &&
2252             conn_id->id.qp_type != IB_QPT_UD) {
2253                 trace_cm_send_mra(cm_id->context);
2254                 ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
2255         }
2256         mutex_unlock(&conn_id->handler_mutex);
2257
2258 err_unlock:
2259         mutex_unlock(&listen_id->handler_mutex);
2260
2261 net_dev_put:
2262         if (net_dev)
2263                 dev_put(net_dev);
2264
2265         return ret;
2266 }
2267
2268 __be64 rdma_get_service_id(struct rdma_cm_id *id, struct sockaddr *addr)
2269 {
2270         if (addr->sa_family == AF_IB)
2271                 return ((struct sockaddr_ib *) addr)->sib_sid;
2272
2273         return cpu_to_be64(((u64)id->ps << 16) + be16_to_cpu(cma_port(addr)));
2274 }
2275 EXPORT_SYMBOL(rdma_get_service_id);
2276
2277 void rdma_read_gids(struct rdma_cm_id *cm_id, union ib_gid *sgid,
2278                     union ib_gid *dgid)
2279 {
2280         struct rdma_addr *addr = &cm_id->route.addr;
2281
2282         if (!cm_id->device) {
2283                 if (sgid)
2284                         memset(sgid, 0, sizeof(*sgid));
2285                 if (dgid)
2286                         memset(dgid, 0, sizeof(*dgid));
2287                 return;
2288         }
2289
2290         if (rdma_protocol_roce(cm_id->device, cm_id->port_num)) {
2291                 if (sgid)
2292                         rdma_ip2gid((struct sockaddr *)&addr->src_addr, sgid);
2293                 if (dgid)
2294                         rdma_ip2gid((struct sockaddr *)&addr->dst_addr, dgid);
2295         } else {
2296                 if (sgid)
2297                         rdma_addr_get_sgid(&addr->dev_addr, sgid);
2298                 if (dgid)
2299                         rdma_addr_get_dgid(&addr->dev_addr, dgid);
2300         }
2301 }
2302 EXPORT_SYMBOL(rdma_read_gids);
2303
2304 static int cma_iw_handler(struct iw_cm_id *iw_id, struct iw_cm_event *iw_event)
2305 {
2306         struct rdma_id_private *id_priv = iw_id->context;
2307         struct rdma_cm_event event = {};
2308         int ret = 0;
2309         struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr;
2310         struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr;
2311
2312         mutex_lock(&id_priv->handler_mutex);
2313         if (READ_ONCE(id_priv->state) != RDMA_CM_CONNECT)
2314                 goto out;
2315
2316         switch (iw_event->event) {
2317         case IW_CM_EVENT_CLOSE:
2318                 event.event = RDMA_CM_EVENT_DISCONNECTED;
2319                 break;
2320         case IW_CM_EVENT_CONNECT_REPLY:
2321                 memcpy(cma_src_addr(id_priv), laddr,
2322                        rdma_addr_size(laddr));
2323                 memcpy(cma_dst_addr(id_priv), raddr,
2324                        rdma_addr_size(raddr));
2325                 switch (iw_event->status) {
2326                 case 0:
2327                         event.event = RDMA_CM_EVENT_ESTABLISHED;
2328                         event.param.conn.initiator_depth = iw_event->ird;
2329                         event.param.conn.responder_resources = iw_event->ord;
2330                         break;
2331                 case -ECONNRESET:
2332                 case -ECONNREFUSED:
2333                         event.event = RDMA_CM_EVENT_REJECTED;
2334                         break;
2335                 case -ETIMEDOUT:
2336                         event.event = RDMA_CM_EVENT_UNREACHABLE;
2337                         break;
2338                 default:
2339                         event.event = RDMA_CM_EVENT_CONNECT_ERROR;
2340                         break;
2341                 }
2342                 break;
2343         case IW_CM_EVENT_ESTABLISHED:
2344                 event.event = RDMA_CM_EVENT_ESTABLISHED;
2345                 event.param.conn.initiator_depth = iw_event->ird;
2346                 event.param.conn.responder_resources = iw_event->ord;
2347                 break;
2348         default:
2349                 goto out;
2350         }
2351
2352         event.status = iw_event->status;
2353         event.param.conn.private_data = iw_event->private_data;
2354         event.param.conn.private_data_len = iw_event->private_data_len;
2355         ret = cma_cm_event_handler(id_priv, &event);
2356         if (ret) {
2357                 /* Destroy the CM ID by returning a non-zero value. */
2358                 id_priv->cm_id.iw = NULL;
2359                 destroy_id_handler_unlock(id_priv);
2360                 return ret;
2361         }
2362
2363 out:
2364         mutex_unlock(&id_priv->handler_mutex);
2365         return ret;
2366 }
2367
2368 static int iw_conn_req_handler(struct iw_cm_id *cm_id,
2369                                struct iw_cm_event *iw_event)
2370 {
2371         struct rdma_id_private *listen_id, *conn_id;
2372         struct rdma_cm_event event = {};
2373         int ret = -ECONNABORTED;
2374         struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr;
2375         struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr;
2376
2377         event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
2378         event.param.conn.private_data = iw_event->private_data;
2379         event.param.conn.private_data_len = iw_event->private_data_len;
2380         event.param.conn.initiator_depth = iw_event->ird;
2381         event.param.conn.responder_resources = iw_event->ord;
2382
2383         listen_id = cm_id->context;
2384
2385         mutex_lock(&listen_id->handler_mutex);
2386         if (READ_ONCE(listen_id->state) != RDMA_CM_LISTEN)
2387                 goto out;
2388
2389         /* Create a new RDMA id for the new IW CM ID */
2390         conn_id = __rdma_create_id(listen_id->id.route.addr.dev_addr.net,
2391                                    listen_id->id.event_handler,
2392                                    listen_id->id.context, RDMA_PS_TCP,
2393                                    IB_QPT_RC, listen_id);
2394         if (IS_ERR(conn_id)) {
2395                 ret = -ENOMEM;
2396                 goto out;
2397         }
2398         mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
2399         conn_id->state = RDMA_CM_CONNECT;
2400
2401         ret = rdma_translate_ip(laddr, &conn_id->id.route.addr.dev_addr);
2402         if (ret) {
2403                 mutex_unlock(&listen_id->handler_mutex);
2404                 destroy_id_handler_unlock(conn_id);
2405                 return ret;
2406         }
2407
2408         ret = cma_iw_acquire_dev(conn_id, listen_id);
2409         if (ret) {
2410                 mutex_unlock(&listen_id->handler_mutex);
2411                 destroy_id_handler_unlock(conn_id);
2412                 return ret;
2413         }
2414
2415         conn_id->cm_id.iw = cm_id;
2416         cm_id->context = conn_id;
2417         cm_id->cm_handler = cma_iw_handler;
2418
2419         memcpy(cma_src_addr(conn_id), laddr, rdma_addr_size(laddr));
2420         memcpy(cma_dst_addr(conn_id), raddr, rdma_addr_size(raddr));
2421
2422         ret = cma_cm_event_handler(conn_id, &event);
2423         if (ret) {
2424                 /* User wants to destroy the CM ID */
2425                 conn_id->cm_id.iw = NULL;
2426                 mutex_unlock(&listen_id->handler_mutex);
2427                 destroy_id_handler_unlock(conn_id);
2428                 return ret;
2429         }
2430
2431         mutex_unlock(&conn_id->handler_mutex);
2432
2433 out:
2434         mutex_unlock(&listen_id->handler_mutex);
2435         return ret;
2436 }
2437
2438 static int cma_ib_listen(struct rdma_id_private *id_priv)
2439 {
2440         struct sockaddr *addr;
2441         struct ib_cm_id *id;
2442         __be64 svc_id;
2443
2444         addr = cma_src_addr(id_priv);
2445         svc_id = rdma_get_service_id(&id_priv->id, addr);
2446         id = ib_cm_insert_listen(id_priv->id.device,
2447                                  cma_ib_req_handler, svc_id);
2448         if (IS_ERR(id))
2449                 return PTR_ERR(id);
2450         id_priv->cm_id.ib = id;
2451
2452         return 0;
2453 }
2454
2455 static int cma_iw_listen(struct rdma_id_private *id_priv, int backlog)
2456 {
2457         int ret;
2458         struct iw_cm_id *id;
2459
2460         id = iw_create_cm_id(id_priv->id.device,
2461                              iw_conn_req_handler,
2462                              id_priv);
2463         if (IS_ERR(id))
2464                 return PTR_ERR(id);
2465
2466         id->tos = id_priv->tos;
2467         id->tos_set = id_priv->tos_set;
2468         id_priv->cm_id.iw = id;
2469
2470         memcpy(&id_priv->cm_id.iw->local_addr, cma_src_addr(id_priv),
2471                rdma_addr_size(cma_src_addr(id_priv)));
2472
2473         ret = iw_cm_listen(id_priv->cm_id.iw, backlog);
2474
2475         if (ret) {
2476                 iw_destroy_cm_id(id_priv->cm_id.iw);
2477                 id_priv->cm_id.iw = NULL;
2478         }
2479
2480         return ret;
2481 }
2482
2483 static int cma_listen_handler(struct rdma_cm_id *id,
2484                               struct rdma_cm_event *event)
2485 {
2486         struct rdma_id_private *id_priv = id->context;
2487
2488         /* Listening IDs are always destroyed on removal */
2489         if (event->event == RDMA_CM_EVENT_DEVICE_REMOVAL)
2490                 return -1;
2491
2492         id->context = id_priv->id.context;
2493         id->event_handler = id_priv->id.event_handler;
2494         trace_cm_event_handler(id_priv, event);
2495         return id_priv->id.event_handler(id, event);
2496 }
2497
2498 static void cma_listen_on_dev(struct rdma_id_private *id_priv,
2499                               struct cma_device *cma_dev)
2500 {
2501         struct rdma_id_private *dev_id_priv;
2502         struct net *net = id_priv->id.route.addr.dev_addr.net;
2503         int ret;
2504
2505         lockdep_assert_held(&lock);
2506
2507         if (cma_family(id_priv) == AF_IB && !rdma_cap_ib_cm(cma_dev->device, 1))
2508                 return;
2509
2510         dev_id_priv =
2511                 __rdma_create_id(net, cma_listen_handler, id_priv,
2512                                  id_priv->id.ps, id_priv->id.qp_type, id_priv);
2513         if (IS_ERR(dev_id_priv))
2514                 return;
2515
2516         dev_id_priv->state = RDMA_CM_ADDR_BOUND;
2517         memcpy(cma_src_addr(dev_id_priv), cma_src_addr(id_priv),
2518                rdma_addr_size(cma_src_addr(id_priv)));
2519
2520         _cma_attach_to_dev(dev_id_priv, cma_dev);
2521         list_add_tail(&dev_id_priv->listen_list, &id_priv->listen_list);
2522         cma_id_get(id_priv);
2523         dev_id_priv->internal_id = 1;
2524         dev_id_priv->afonly = id_priv->afonly;
2525         dev_id_priv->tos_set = id_priv->tos_set;
2526         dev_id_priv->tos = id_priv->tos;
2527
2528         ret = rdma_listen(&dev_id_priv->id, id_priv->backlog);
2529         if (ret)
2530                 dev_warn(&cma_dev->device->dev,
2531                          "RDMA CMA: cma_listen_on_dev, error %d\n", ret);
2532 }
2533
2534 static void cma_listen_on_all(struct rdma_id_private *id_priv)
2535 {
2536         struct cma_device *cma_dev;
2537
2538         mutex_lock(&lock);
2539         list_add_tail(&id_priv->list, &listen_any_list);
2540         list_for_each_entry(cma_dev, &dev_list, list)
2541                 cma_listen_on_dev(id_priv, cma_dev);
2542         mutex_unlock(&lock);
2543 }
2544
2545 void rdma_set_service_type(struct rdma_cm_id *id, int tos)
2546 {
2547         struct rdma_id_private *id_priv;
2548
2549         id_priv = container_of(id, struct rdma_id_private, id);
2550         id_priv->tos = (u8) tos;
2551         id_priv->tos_set = true;
2552 }
2553 EXPORT_SYMBOL(rdma_set_service_type);
2554
2555 /**
2556  * rdma_set_ack_timeout() - Set the ack timeout of QP associated
2557  *                          with a connection identifier.
2558  * @id: Communication identifier to associated with service type.
2559  * @timeout: Ack timeout to set a QP, expressed as 4.096 * 2^(timeout) usec.
2560  *
2561  * This function should be called before rdma_connect() on active side,
2562  * and on passive side before rdma_accept(). It is applicable to primary
2563  * path only. The timeout will affect the local side of the QP, it is not
2564  * negotiated with remote side and zero disables the timer. In case it is
2565  * set before rdma_resolve_route, the value will also be used to determine
2566  * PacketLifeTime for RoCE.
2567  *
2568  * Return: 0 for success
2569  */
2570 int rdma_set_ack_timeout(struct rdma_cm_id *id, u8 timeout)
2571 {
2572         struct rdma_id_private *id_priv;
2573
2574         if (id->qp_type != IB_QPT_RC)
2575                 return -EINVAL;
2576
2577         id_priv = container_of(id, struct rdma_id_private, id);
2578         id_priv->timeout = timeout;
2579         id_priv->timeout_set = true;
2580
2581         return 0;
2582 }
2583 EXPORT_SYMBOL(rdma_set_ack_timeout);
2584
2585 static void cma_query_handler(int status, struct sa_path_rec *path_rec,
2586                               void *context)
2587 {
2588         struct cma_work *work = context;
2589         struct rdma_route *route;
2590
2591         route = &work->id->id.route;
2592
2593         if (!status) {
2594                 route->num_paths = 1;
2595                 *route->path_rec = *path_rec;
2596         } else {
2597                 work->old_state = RDMA_CM_ROUTE_QUERY;
2598                 work->new_state = RDMA_CM_ADDR_RESOLVED;
2599                 work->event.event = RDMA_CM_EVENT_ROUTE_ERROR;
2600                 work->event.status = status;
2601                 pr_debug_ratelimited("RDMA CM: ROUTE_ERROR: failed to query path. status %d\n",
2602                                      status);
2603         }
2604
2605         queue_work(cma_wq, &work->work);
2606 }
2607
2608 static int cma_query_ib_route(struct rdma_id_private *id_priv,
2609                               unsigned long timeout_ms, struct cma_work *work)
2610 {
2611         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
2612         struct sa_path_rec path_rec;
2613         ib_sa_comp_mask comp_mask;
2614         struct sockaddr_in6 *sin6;
2615         struct sockaddr_ib *sib;
2616
2617         memset(&path_rec, 0, sizeof path_rec);
2618
2619         if (rdma_cap_opa_ah(id_priv->id.device, id_priv->id.port_num))
2620                 path_rec.rec_type = SA_PATH_REC_TYPE_OPA;
2621         else
2622                 path_rec.rec_type = SA_PATH_REC_TYPE_IB;
2623         rdma_addr_get_sgid(dev_addr, &path_rec.sgid);
2624         rdma_addr_get_dgid(dev_addr, &path_rec.dgid);
2625         path_rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
2626         path_rec.numb_path = 1;
2627         path_rec.reversible = 1;
2628         path_rec.service_id = rdma_get_service_id(&id_priv->id,
2629                                                   cma_dst_addr(id_priv));
2630
2631         comp_mask = IB_SA_PATH_REC_DGID | IB_SA_PATH_REC_SGID |
2632                     IB_SA_PATH_REC_PKEY | IB_SA_PATH_REC_NUMB_PATH |
2633                     IB_SA_PATH_REC_REVERSIBLE | IB_SA_PATH_REC_SERVICE_ID;
2634
2635         switch (cma_family(id_priv)) {
2636         case AF_INET:
2637                 path_rec.qos_class = cpu_to_be16((u16) id_priv->tos);
2638                 comp_mask |= IB_SA_PATH_REC_QOS_CLASS;
2639                 break;
2640         case AF_INET6:
2641                 sin6 = (struct sockaddr_in6 *) cma_src_addr(id_priv);
2642                 path_rec.traffic_class = (u8) (be32_to_cpu(sin6->sin6_flowinfo) >> 20);
2643                 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
2644                 break;
2645         case AF_IB:
2646                 sib = (struct sockaddr_ib *) cma_src_addr(id_priv);
2647                 path_rec.traffic_class = (u8) (be32_to_cpu(sib->sib_flowinfo) >> 20);
2648                 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
2649                 break;
2650         }
2651
2652         id_priv->query_id = ib_sa_path_rec_get(&sa_client, id_priv->id.device,
2653                                                id_priv->id.port_num, &path_rec,
2654                                                comp_mask, timeout_ms,
2655                                                GFP_KERNEL, cma_query_handler,
2656                                                work, &id_priv->query);
2657
2658         return (id_priv->query_id < 0) ? id_priv->query_id : 0;
2659 }
2660
2661 static void cma_work_handler(struct work_struct *_work)
2662 {
2663         struct cma_work *work = container_of(_work, struct cma_work, work);
2664         struct rdma_id_private *id_priv = work->id;
2665
2666         mutex_lock(&id_priv->handler_mutex);
2667         if (READ_ONCE(id_priv->state) == RDMA_CM_DESTROYING ||
2668             READ_ONCE(id_priv->state) == RDMA_CM_DEVICE_REMOVAL)
2669                 goto out_unlock;
2670         if (work->old_state != 0 || work->new_state != 0) {
2671                 if (!cma_comp_exch(id_priv, work->old_state, work->new_state))
2672                         goto out_unlock;
2673         }
2674
2675         if (cma_cm_event_handler(id_priv, &work->event)) {
2676                 cma_id_put(id_priv);
2677                 destroy_id_handler_unlock(id_priv);
2678                 goto out_free;
2679         }
2680
2681 out_unlock:
2682         mutex_unlock(&id_priv->handler_mutex);
2683         cma_id_put(id_priv);
2684 out_free:
2685         if (work->event.event == RDMA_CM_EVENT_MULTICAST_JOIN)
2686                 rdma_destroy_ah_attr(&work->event.param.ud.ah_attr);
2687         kfree(work);
2688 }
2689
2690 static void cma_init_resolve_route_work(struct cma_work *work,
2691                                         struct rdma_id_private *id_priv)
2692 {
2693         work->id = id_priv;
2694         INIT_WORK(&work->work, cma_work_handler);
2695         work->old_state = RDMA_CM_ROUTE_QUERY;
2696         work->new_state = RDMA_CM_ROUTE_RESOLVED;
2697         work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
2698 }
2699
2700 static void enqueue_resolve_addr_work(struct cma_work *work,
2701                                       struct rdma_id_private *id_priv)
2702 {
2703         /* Balances with cma_id_put() in cma_work_handler */
2704         cma_id_get(id_priv);
2705
2706         work->id = id_priv;
2707         INIT_WORK(&work->work, cma_work_handler);
2708         work->old_state = RDMA_CM_ADDR_QUERY;
2709         work->new_state = RDMA_CM_ADDR_RESOLVED;
2710         work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
2711
2712         queue_work(cma_wq, &work->work);
2713 }
2714
2715 static int cma_resolve_ib_route(struct rdma_id_private *id_priv,
2716                                 unsigned long timeout_ms)
2717 {
2718         struct rdma_route *route = &id_priv->id.route;
2719         struct cma_work *work;
2720         int ret;
2721
2722         work = kzalloc(sizeof *work, GFP_KERNEL);
2723         if (!work)
2724                 return -ENOMEM;
2725
2726         cma_init_resolve_route_work(work, id_priv);
2727
2728         route->path_rec = kmalloc(sizeof *route->path_rec, GFP_KERNEL);
2729         if (!route->path_rec) {
2730                 ret = -ENOMEM;
2731                 goto err1;
2732         }
2733
2734         ret = cma_query_ib_route(id_priv, timeout_ms, work);
2735         if (ret)
2736                 goto err2;
2737
2738         return 0;
2739 err2:
2740         kfree(route->path_rec);
2741         route->path_rec = NULL;
2742 err1:
2743         kfree(work);
2744         return ret;
2745 }
2746
2747 static enum ib_gid_type cma_route_gid_type(enum rdma_network_type network_type,
2748                                            unsigned long supported_gids,
2749                                            enum ib_gid_type default_gid)
2750 {
2751         if ((network_type == RDMA_NETWORK_IPV4 ||
2752              network_type == RDMA_NETWORK_IPV6) &&
2753             test_bit(IB_GID_TYPE_ROCE_UDP_ENCAP, &supported_gids))
2754                 return IB_GID_TYPE_ROCE_UDP_ENCAP;
2755
2756         return default_gid;
2757 }
2758
2759 /*
2760  * cma_iboe_set_path_rec_l2_fields() is helper function which sets
2761  * path record type based on GID type.
2762  * It also sets up other L2 fields which includes destination mac address
2763  * netdev ifindex, of the path record.
2764  * It returns the netdev of the bound interface for this path record entry.
2765  */
2766 static struct net_device *
2767 cma_iboe_set_path_rec_l2_fields(struct rdma_id_private *id_priv)
2768 {
2769         struct rdma_route *route = &id_priv->id.route;
2770         enum ib_gid_type gid_type = IB_GID_TYPE_ROCE;
2771         struct rdma_addr *addr = &route->addr;
2772         unsigned long supported_gids;
2773         struct net_device *ndev;
2774
2775         if (!addr->dev_addr.bound_dev_if)
2776                 return NULL;
2777
2778         ndev = dev_get_by_index(addr->dev_addr.net,
2779                                 addr->dev_addr.bound_dev_if);
2780         if (!ndev)
2781                 return NULL;
2782
2783         supported_gids = roce_gid_type_mask_support(id_priv->id.device,
2784                                                     id_priv->id.port_num);
2785         gid_type = cma_route_gid_type(addr->dev_addr.network,
2786                                       supported_gids,
2787                                       id_priv->gid_type);
2788         /* Use the hint from IP Stack to select GID Type */
2789         if (gid_type < ib_network_to_gid_type(addr->dev_addr.network))
2790                 gid_type = ib_network_to_gid_type(addr->dev_addr.network);
2791         route->path_rec->rec_type = sa_conv_gid_to_pathrec_type(gid_type);
2792
2793         route->path_rec->roce.route_resolved = true;
2794         sa_path_set_dmac(route->path_rec, addr->dev_addr.dst_dev_addr);
2795         return ndev;
2796 }
2797
2798 int rdma_set_ib_path(struct rdma_cm_id *id,
2799                      struct sa_path_rec *path_rec)
2800 {
2801         struct rdma_id_private *id_priv;
2802         struct net_device *ndev;
2803         int ret;
2804
2805         id_priv = container_of(id, struct rdma_id_private, id);
2806         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
2807                            RDMA_CM_ROUTE_RESOLVED))
2808                 return -EINVAL;
2809
2810         id->route.path_rec = kmemdup(path_rec, sizeof(*path_rec),
2811                                      GFP_KERNEL);
2812         if (!id->route.path_rec) {
2813                 ret = -ENOMEM;
2814                 goto err;
2815         }
2816
2817         if (rdma_protocol_roce(id->device, id->port_num)) {
2818                 ndev = cma_iboe_set_path_rec_l2_fields(id_priv);
2819                 if (!ndev) {
2820                         ret = -ENODEV;
2821                         goto err_free;
2822                 }
2823                 dev_put(ndev);
2824         }
2825
2826         id->route.num_paths = 1;
2827         return 0;
2828
2829 err_free:
2830         kfree(id->route.path_rec);
2831         id->route.path_rec = NULL;
2832 err:
2833         cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_ADDR_RESOLVED);
2834         return ret;
2835 }
2836 EXPORT_SYMBOL(rdma_set_ib_path);
2837
2838 static int cma_resolve_iw_route(struct rdma_id_private *id_priv)
2839 {
2840         struct cma_work *work;
2841
2842         work = kzalloc(sizeof *work, GFP_KERNEL);
2843         if (!work)
2844                 return -ENOMEM;
2845
2846         cma_init_resolve_route_work(work, id_priv);
2847         queue_work(cma_wq, &work->work);
2848         return 0;
2849 }
2850
2851 static int get_vlan_ndev_tc(struct net_device *vlan_ndev, int prio)
2852 {
2853         struct net_device *dev;
2854
2855         dev = vlan_dev_real_dev(vlan_ndev);
2856         if (dev->num_tc)
2857                 return netdev_get_prio_tc_map(dev, prio);
2858
2859         return (vlan_dev_get_egress_qos_mask(vlan_ndev, prio) &
2860                 VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
2861 }
2862
2863 struct iboe_prio_tc_map {
2864         int input_prio;
2865         int output_tc;
2866         bool found;
2867 };
2868
2869 static int get_lower_vlan_dev_tc(struct net_device *dev,
2870                                  struct netdev_nested_priv *priv)
2871 {
2872         struct iboe_prio_tc_map *map = (struct iboe_prio_tc_map *)priv->data;
2873
2874         if (is_vlan_dev(dev))
2875                 map->output_tc = get_vlan_ndev_tc(dev, map->input_prio);
2876         else if (dev->num_tc)
2877                 map->output_tc = netdev_get_prio_tc_map(dev, map->input_prio);
2878         else
2879                 map->output_tc = 0;
2880         /* We are interested only in first level VLAN device, so always
2881          * return 1 to stop iterating over next level devices.
2882          */
2883         map->found = true;
2884         return 1;
2885 }
2886
2887 static int iboe_tos_to_sl(struct net_device *ndev, int tos)
2888 {
2889         struct iboe_prio_tc_map prio_tc_map = {};
2890         int prio = rt_tos2priority(tos);
2891         struct netdev_nested_priv priv;
2892
2893         /* If VLAN device, get it directly from the VLAN netdev */
2894         if (is_vlan_dev(ndev))
2895                 return get_vlan_ndev_tc(ndev, prio);
2896
2897         prio_tc_map.input_prio = prio;
2898         priv.data = (void *)&prio_tc_map;
2899         rcu_read_lock();
2900         netdev_walk_all_lower_dev_rcu(ndev,
2901                                       get_lower_vlan_dev_tc,
2902                                       &priv);
2903         rcu_read_unlock();
2904         /* If map is found from lower device, use it; Otherwise
2905          * continue with the current netdevice to get priority to tc map.
2906          */
2907         if (prio_tc_map.found)
2908                 return prio_tc_map.output_tc;
2909         else if (ndev->num_tc)
2910                 return netdev_get_prio_tc_map(ndev, prio);
2911         else
2912                 return 0;
2913 }
2914
2915 static __be32 cma_get_roce_udp_flow_label(struct rdma_id_private *id_priv)
2916 {
2917         struct sockaddr_in6 *addr6;
2918         u16 dport, sport;
2919         u32 hash, fl;
2920
2921         addr6 = (struct sockaddr_in6 *)cma_src_addr(id_priv);
2922         fl = be32_to_cpu(addr6->sin6_flowinfo) & IB_GRH_FLOWLABEL_MASK;
2923         if ((cma_family(id_priv) != AF_INET6) || !fl) {
2924                 dport = be16_to_cpu(cma_port(cma_dst_addr(id_priv)));
2925                 sport = be16_to_cpu(cma_port(cma_src_addr(id_priv)));
2926                 hash = (u32)sport * 31 + dport;
2927                 fl = hash & IB_GRH_FLOWLABEL_MASK;
2928         }
2929
2930         return cpu_to_be32(fl);
2931 }
2932
2933 static int cma_resolve_iboe_route(struct rdma_id_private *id_priv)
2934 {
2935         struct rdma_route *route = &id_priv->id.route;
2936         struct rdma_addr *addr = &route->addr;
2937         struct cma_work *work;
2938         int ret;
2939         struct net_device *ndev;
2940
2941         u8 default_roce_tos = id_priv->cma_dev->default_roce_tos[id_priv->id.port_num -
2942                                         rdma_start_port(id_priv->cma_dev->device)];
2943         u8 tos = id_priv->tos_set ? id_priv->tos : default_roce_tos;
2944
2945
2946         work = kzalloc(sizeof *work, GFP_KERNEL);
2947         if (!work)
2948                 return -ENOMEM;
2949
2950         route->path_rec = kzalloc(sizeof *route->path_rec, GFP_KERNEL);
2951         if (!route->path_rec) {
2952                 ret = -ENOMEM;
2953                 goto err1;
2954         }
2955
2956         route->num_paths = 1;
2957
2958         ndev = cma_iboe_set_path_rec_l2_fields(id_priv);
2959         if (!ndev) {
2960                 ret = -ENODEV;
2961                 goto err2;
2962         }
2963
2964         rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
2965                     &route->path_rec->sgid);
2966         rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.dst_addr,
2967                     &route->path_rec->dgid);
2968
2969         if (((struct sockaddr *)&id_priv->id.route.addr.dst_addr)->sa_family != AF_IB)
2970                 /* TODO: get the hoplimit from the inet/inet6 device */
2971                 route->path_rec->hop_limit = addr->dev_addr.hoplimit;
2972         else
2973                 route->path_rec->hop_limit = 1;
2974         route->path_rec->reversible = 1;
2975         route->path_rec->pkey = cpu_to_be16(0xffff);
2976         route->path_rec->mtu_selector = IB_SA_EQ;
2977         route->path_rec->sl = iboe_tos_to_sl(ndev, tos);
2978         route->path_rec->traffic_class = tos;
2979         route->path_rec->mtu = iboe_get_mtu(ndev->mtu);
2980         route->path_rec->rate_selector = IB_SA_EQ;
2981         route->path_rec->rate = iboe_get_rate(ndev);
2982         dev_put(ndev);
2983         route->path_rec->packet_life_time_selector = IB_SA_EQ;
2984         /* In case ACK timeout is set, use this value to calculate
2985          * PacketLifeTime.  As per IBTA 12.7.34,
2986          * local ACK timeout = (2 * PacketLifeTime + Local CA’s ACK delay).
2987          * Assuming a negligible local ACK delay, we can use
2988          * PacketLifeTime = local ACK timeout/2
2989          * as a reasonable approximation for RoCE networks.
2990          */
2991         route->path_rec->packet_life_time = id_priv->timeout_set ?
2992                 id_priv->timeout - 1 : CMA_IBOE_PACKET_LIFETIME;
2993
2994         if (!route->path_rec->mtu) {
2995                 ret = -EINVAL;
2996                 goto err2;
2997         }
2998
2999         if (rdma_protocol_roce_udp_encap(id_priv->id.device,
3000                                          id_priv->id.port_num))
3001                 route->path_rec->flow_label =
3002                         cma_get_roce_udp_flow_label(id_priv);
3003
3004         cma_init_resolve_route_work(work, id_priv);
3005         queue_work(cma_wq, &work->work);
3006
3007         return 0;
3008
3009 err2:
3010         kfree(route->path_rec);
3011         route->path_rec = NULL;
3012         route->num_paths = 0;
3013 err1:
3014         kfree(work);
3015         return ret;
3016 }
3017
3018 int rdma_resolve_route(struct rdma_cm_id *id, unsigned long timeout_ms)
3019 {
3020         struct rdma_id_private *id_priv;
3021         int ret;
3022
3023         id_priv = container_of(id, struct rdma_id_private, id);
3024         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED, RDMA_CM_ROUTE_QUERY))
3025                 return -EINVAL;
3026
3027         cma_id_get(id_priv);
3028         if (rdma_cap_ib_sa(id->device, id->port_num))
3029                 ret = cma_resolve_ib_route(id_priv, timeout_ms);
3030         else if (rdma_protocol_roce(id->device, id->port_num))
3031                 ret = cma_resolve_iboe_route(id_priv);
3032         else if (rdma_protocol_iwarp(id->device, id->port_num))
3033                 ret = cma_resolve_iw_route(id_priv);
3034         else
3035                 ret = -ENOSYS;
3036
3037         if (ret)
3038                 goto err;
3039
3040         return 0;
3041 err:
3042         cma_comp_exch(id_priv, RDMA_CM_ROUTE_QUERY, RDMA_CM_ADDR_RESOLVED);
3043         cma_id_put(id_priv);
3044         return ret;
3045 }
3046 EXPORT_SYMBOL(rdma_resolve_route);
3047
3048 static void cma_set_loopback(struct sockaddr *addr)
3049 {
3050         switch (addr->sa_family) {
3051         case AF_INET:
3052                 ((struct sockaddr_in *) addr)->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
3053                 break;
3054         case AF_INET6:
3055                 ipv6_addr_set(&((struct sockaddr_in6 *) addr)->sin6_addr,
3056                               0, 0, 0, htonl(1));
3057                 break;
3058         default:
3059                 ib_addr_set(&((struct sockaddr_ib *) addr)->sib_addr,
3060                             0, 0, 0, htonl(1));
3061                 break;
3062         }
3063 }
3064
3065 static int cma_bind_loopback(struct rdma_id_private *id_priv)
3066 {
3067         struct cma_device *cma_dev, *cur_dev;
3068         union ib_gid gid;
3069         enum ib_port_state port_state;
3070         unsigned int p;
3071         u16 pkey;
3072         int ret;
3073
3074         cma_dev = NULL;
3075         mutex_lock(&lock);
3076         list_for_each_entry(cur_dev, &dev_list, list) {
3077                 if (cma_family(id_priv) == AF_IB &&
3078                     !rdma_cap_ib_cm(cur_dev->device, 1))
3079                         continue;
3080
3081                 if (!cma_dev)
3082                         cma_dev = cur_dev;
3083
3084                 rdma_for_each_port (cur_dev->device, p) {
3085                         if (!ib_get_cached_port_state(cur_dev->device, p, &port_state) &&
3086                             port_state == IB_PORT_ACTIVE) {
3087                                 cma_dev = cur_dev;
3088                                 goto port_found;
3089                         }
3090                 }
3091         }
3092
3093         if (!cma_dev) {
3094                 ret = -ENODEV;
3095                 goto out;
3096         }
3097
3098         p = 1;
3099
3100 port_found:
3101         ret = rdma_query_gid(cma_dev->device, p, 0, &gid);
3102         if (ret)
3103                 goto out;
3104
3105         ret = ib_get_cached_pkey(cma_dev->device, p, 0, &pkey);
3106         if (ret)
3107                 goto out;
3108
3109         id_priv->id.route.addr.dev_addr.dev_type =
3110                 (rdma_protocol_ib(cma_dev->device, p)) ?
3111                 ARPHRD_INFINIBAND : ARPHRD_ETHER;
3112
3113         rdma_addr_set_sgid(&id_priv->id.route.addr.dev_addr, &gid);
3114         ib_addr_set_pkey(&id_priv->id.route.addr.dev_addr, pkey);
3115         id_priv->id.port_num = p;
3116         cma_attach_to_dev(id_priv, cma_dev);
3117         cma_set_loopback(cma_src_addr(id_priv));
3118 out:
3119         mutex_unlock(&lock);
3120         return ret;
3121 }
3122
3123 static void addr_handler(int status, struct sockaddr *src_addr,
3124                          struct rdma_dev_addr *dev_addr, void *context)
3125 {
3126         struct rdma_id_private *id_priv = context;
3127         struct rdma_cm_event event = {};
3128         struct sockaddr *addr;
3129         struct sockaddr_storage old_addr;
3130
3131         mutex_lock(&id_priv->handler_mutex);
3132         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY,
3133                            RDMA_CM_ADDR_RESOLVED))
3134                 goto out;
3135
3136         /*
3137          * Store the previous src address, so that if we fail to acquire
3138          * matching rdma device, old address can be restored back, which helps
3139          * to cancel the cma listen operation correctly.
3140          */
3141         addr = cma_src_addr(id_priv);
3142         memcpy(&old_addr, addr, rdma_addr_size(addr));
3143         memcpy(addr, src_addr, rdma_addr_size(src_addr));
3144         if (!status && !id_priv->cma_dev) {
3145                 status = cma_acquire_dev_by_src_ip(id_priv);
3146                 if (status)
3147                         pr_debug_ratelimited("RDMA CM: ADDR_ERROR: failed to acquire device. status %d\n",
3148                                              status);
3149         } else if (status) {
3150                 pr_debug_ratelimited("RDMA CM: ADDR_ERROR: failed to resolve IP. status %d\n", status);
3151         }
3152
3153         if (status) {
3154                 memcpy(addr, &old_addr,
3155                        rdma_addr_size((struct sockaddr *)&old_addr));
3156                 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
3157                                    RDMA_CM_ADDR_BOUND))
3158                         goto out;
3159                 event.event = RDMA_CM_EVENT_ADDR_ERROR;
3160                 event.status = status;
3161         } else
3162                 event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
3163
3164         if (cma_cm_event_handler(id_priv, &event)) {
3165                 destroy_id_handler_unlock(id_priv);
3166                 return;
3167         }
3168 out:
3169         mutex_unlock(&id_priv->handler_mutex);
3170 }
3171
3172 static int cma_resolve_loopback(struct rdma_id_private *id_priv)
3173 {
3174         struct cma_work *work;
3175         union ib_gid gid;
3176         int ret;
3177
3178         work = kzalloc(sizeof *work, GFP_KERNEL);
3179         if (!work)
3180                 return -ENOMEM;
3181
3182         if (!id_priv->cma_dev) {
3183                 ret = cma_bind_loopback(id_priv);
3184                 if (ret)
3185                         goto err;
3186         }
3187
3188         rdma_addr_get_sgid(&id_priv->id.route.addr.dev_addr, &gid);
3189         rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, &gid);
3190
3191         enqueue_resolve_addr_work(work, id_priv);
3192         return 0;
3193 err:
3194         kfree(work);
3195         return ret;
3196 }
3197
3198 static int cma_resolve_ib_addr(struct rdma_id_private *id_priv)
3199 {
3200         struct cma_work *work;
3201         int ret;
3202
3203         work = kzalloc(sizeof *work, GFP_KERNEL);
3204         if (!work)
3205                 return -ENOMEM;
3206
3207         if (!id_priv->cma_dev) {
3208                 ret = cma_resolve_ib_dev(id_priv);
3209                 if (ret)
3210                         goto err;
3211         }
3212
3213         rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, (union ib_gid *)
3214                 &(((struct sockaddr_ib *) &id_priv->id.route.addr.dst_addr)->sib_addr));
3215
3216         enqueue_resolve_addr_work(work, id_priv);
3217         return 0;
3218 err:
3219         kfree(work);
3220         return ret;
3221 }
3222
3223 static int cma_bind_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
3224                          const struct sockaddr *dst_addr)
3225 {
3226         if (!src_addr || !src_addr->sa_family) {
3227                 src_addr = (struct sockaddr *) &id->route.addr.src_addr;
3228                 src_addr->sa_family = dst_addr->sa_family;
3229                 if (IS_ENABLED(CONFIG_IPV6) &&
3230                     dst_addr->sa_family == AF_INET6) {
3231                         struct sockaddr_in6 *src_addr6 = (struct sockaddr_in6 *) src_addr;
3232                         struct sockaddr_in6 *dst_addr6 = (struct sockaddr_in6 *) dst_addr;
3233                         src_addr6->sin6_scope_id = dst_addr6->sin6_scope_id;
3234                         if (ipv6_addr_type(&dst_addr6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
3235                                 id->route.addr.dev_addr.bound_dev_if = dst_addr6->sin6_scope_id;
3236                 } else if (dst_addr->sa_family == AF_IB) {
3237                         ((struct sockaddr_ib *) src_addr)->sib_pkey =
3238                                 ((struct sockaddr_ib *) dst_addr)->sib_pkey;
3239                 }
3240         }
3241         return rdma_bind_addr(id, src_addr);
3242 }
3243
3244 /*
3245  * If required, resolve the source address for bind and leave the id_priv in
3246  * state RDMA_CM_ADDR_BOUND. This oddly uses the state to determine the prior
3247  * calls made by ULP, a previously bound ID will not be re-bound and src_addr is
3248  * ignored.
3249  */
3250 static int resolve_prepare_src(struct rdma_id_private *id_priv,
3251                                struct sockaddr *src_addr,
3252                                const struct sockaddr *dst_addr)
3253 {
3254         int ret;
3255
3256         memcpy(cma_dst_addr(id_priv), dst_addr, rdma_addr_size(dst_addr));
3257         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_ADDR_QUERY)) {
3258                 /* For a well behaved ULP state will be RDMA_CM_IDLE */
3259                 ret = cma_bind_addr(&id_priv->id, src_addr, dst_addr);
3260                 if (ret)
3261                         goto err_dst;
3262                 if (WARN_ON(!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND,
3263                                            RDMA_CM_ADDR_QUERY))) {
3264                         ret = -EINVAL;
3265                         goto err_dst;
3266                 }
3267         }
3268
3269         if (cma_family(id_priv) != dst_addr->sa_family) {
3270                 ret = -EINVAL;
3271                 goto err_state;
3272         }
3273         return 0;
3274
3275 err_state:
3276         cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY, RDMA_CM_ADDR_BOUND);
3277 err_dst:
3278         memset(cma_dst_addr(id_priv), 0, rdma_addr_size(dst_addr));
3279         return ret;
3280 }
3281
3282 int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
3283                       const struct sockaddr *dst_addr, unsigned long timeout_ms)
3284 {
3285         struct rdma_id_private *id_priv =
3286                 container_of(id, struct rdma_id_private, id);
3287         int ret;
3288
3289         ret = resolve_prepare_src(id_priv, src_addr, dst_addr);
3290         if (ret)
3291                 return ret;
3292
3293         if (cma_any_addr(dst_addr)) {
3294                 ret = cma_resolve_loopback(id_priv);
3295         } else {
3296                 if (dst_addr->sa_family == AF_IB) {
3297                         ret = cma_resolve_ib_addr(id_priv);
3298                 } else {
3299                         ret = rdma_resolve_ip(cma_src_addr(id_priv), dst_addr,
3300                                               &id->route.addr.dev_addr,
3301                                               timeout_ms, addr_handler,
3302                                               false, id_priv);
3303                 }
3304         }
3305         if (ret)
3306                 goto err;
3307
3308         return 0;
3309 err:
3310         cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY, RDMA_CM_ADDR_BOUND);
3311         return ret;
3312 }
3313 EXPORT_SYMBOL(rdma_resolve_addr);
3314
3315 int rdma_set_reuseaddr(struct rdma_cm_id *id, int reuse)
3316 {
3317         struct rdma_id_private *id_priv;
3318         unsigned long flags;
3319         int ret;
3320
3321         id_priv = container_of(id, struct rdma_id_private, id);
3322         spin_lock_irqsave(&id_priv->lock, flags);
3323         if ((reuse && id_priv->state != RDMA_CM_LISTEN) ||
3324             id_priv->state == RDMA_CM_IDLE) {
3325                 id_priv->reuseaddr = reuse;
3326                 ret = 0;
3327         } else {
3328                 ret = -EINVAL;
3329         }
3330         spin_unlock_irqrestore(&id_priv->lock, flags);
3331         return ret;
3332 }
3333 EXPORT_SYMBOL(rdma_set_reuseaddr);
3334
3335 int rdma_set_afonly(struct rdma_cm_id *id, int afonly)
3336 {
3337         struct rdma_id_private *id_priv;
3338         unsigned long flags;
3339         int ret;
3340
3341         id_priv = container_of(id, struct rdma_id_private, id);
3342         spin_lock_irqsave(&id_priv->lock, flags);
3343         if (id_priv->state == RDMA_CM_IDLE || id_priv->state == RDMA_CM_ADDR_BOUND) {
3344                 id_priv->options |= (1 << CMA_OPTION_AFONLY);
3345                 id_priv->afonly = afonly;
3346                 ret = 0;
3347         } else {
3348                 ret = -EINVAL;
3349         }
3350         spin_unlock_irqrestore(&id_priv->lock, flags);
3351         return ret;
3352 }
3353 EXPORT_SYMBOL(rdma_set_afonly);
3354
3355 static void cma_bind_port(struct rdma_bind_list *bind_list,
3356                           struct rdma_id_private *id_priv)
3357 {
3358         struct sockaddr *addr;
3359         struct sockaddr_ib *sib;
3360         u64 sid, mask;
3361         __be16 port;
3362
3363         lockdep_assert_held(&lock);
3364
3365         addr = cma_src_addr(id_priv);
3366         port = htons(bind_list->port);
3367
3368         switch (addr->sa_family) {
3369         case AF_INET:
3370                 ((struct sockaddr_in *) addr)->sin_port = port;
3371                 break;
3372         case AF_INET6:
3373                 ((struct sockaddr_in6 *) addr)->sin6_port = port;
3374                 break;
3375         case AF_IB:
3376                 sib = (struct sockaddr_ib *) addr;
3377                 sid = be64_to_cpu(sib->sib_sid);
3378                 mask = be64_to_cpu(sib->sib_sid_mask);
3379                 sib->sib_sid = cpu_to_be64((sid & mask) | (u64) ntohs(port));
3380                 sib->sib_sid_mask = cpu_to_be64(~0ULL);
3381                 break;
3382         }
3383         id_priv->bind_list = bind_list;
3384         hlist_add_head(&id_priv->node, &bind_list->owners);
3385 }
3386
3387 static int cma_alloc_port(enum rdma_ucm_port_space ps,
3388                           struct rdma_id_private *id_priv, unsigned short snum)
3389 {
3390         struct rdma_bind_list *bind_list;
3391         int ret;
3392
3393         lockdep_assert_held(&lock);
3394
3395         bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL);
3396         if (!bind_list)
3397                 return -ENOMEM;
3398
3399         ret = cma_ps_alloc(id_priv->id.route.addr.dev_addr.net, ps, bind_list,
3400                            snum);
3401         if (ret < 0)
3402                 goto err;
3403
3404         bind_list->ps = ps;
3405         bind_list->port = snum;
3406         cma_bind_port(bind_list, id_priv);
3407         return 0;
3408 err:
3409         kfree(bind_list);
3410         return ret == -ENOSPC ? -EADDRNOTAVAIL : ret;
3411 }
3412
3413 static int cma_port_is_unique(struct rdma_bind_list *bind_list,
3414                               struct rdma_id_private *id_priv)
3415 {
3416         struct rdma_id_private *cur_id;
3417         struct sockaddr  *daddr = cma_dst_addr(id_priv);
3418         struct sockaddr  *saddr = cma_src_addr(id_priv);
3419         __be16 dport = cma_port(daddr);
3420
3421         lockdep_assert_held(&lock);
3422
3423         hlist_for_each_entry(cur_id, &bind_list->owners, node) {
3424                 struct sockaddr  *cur_daddr = cma_dst_addr(cur_id);
3425                 struct sockaddr  *cur_saddr = cma_src_addr(cur_id);
3426                 __be16 cur_dport = cma_port(cur_daddr);
3427
3428                 if (id_priv == cur_id)
3429                         continue;
3430
3431                 /* different dest port -> unique */
3432                 if (!cma_any_port(daddr) &&
3433                     !cma_any_port(cur_daddr) &&
3434                     (dport != cur_dport))
3435                         continue;
3436
3437                 /* different src address -> unique */
3438                 if (!cma_any_addr(saddr) &&
3439                     !cma_any_addr(cur_saddr) &&
3440                     cma_addr_cmp(saddr, cur_saddr))
3441                         continue;
3442
3443                 /* different dst address -> unique */
3444                 if (!cma_any_addr(daddr) &&
3445                     !cma_any_addr(cur_daddr) &&
3446                     cma_addr_cmp(daddr, cur_daddr))
3447                         continue;
3448
3449                 return -EADDRNOTAVAIL;
3450         }
3451         return 0;
3452 }
3453
3454 static int cma_alloc_any_port(enum rdma_ucm_port_space ps,
3455                               struct rdma_id_private *id_priv)
3456 {
3457         static unsigned int last_used_port;
3458         int low, high, remaining;
3459         unsigned int rover;
3460         struct net *net = id_priv->id.route.addr.dev_addr.net;
3461
3462         lockdep_assert_held(&lock);
3463
3464         inet_get_local_port_range(net, &low, &high);
3465         remaining = (high - low) + 1;
3466         rover = prandom_u32() % remaining + low;
3467 retry:
3468         if (last_used_port != rover) {
3469                 struct rdma_bind_list *bind_list;
3470                 int ret;
3471
3472                 bind_list = cma_ps_find(net, ps, (unsigned short)rover);
3473
3474                 if (!bind_list) {
3475                         ret = cma_alloc_port(ps, id_priv, rover);
3476                 } else {
3477                         ret = cma_port_is_unique(bind_list, id_priv);
3478                         if (!ret)
3479                                 cma_bind_port(bind_list, id_priv);
3480                 }
3481                 /*
3482                  * Remember previously used port number in order to avoid
3483                  * re-using same port immediately after it is closed.
3484                  */
3485                 if (!ret)
3486                         last_used_port = rover;
3487                 if (ret != -EADDRNOTAVAIL)
3488                         return ret;
3489         }
3490         if (--remaining) {
3491                 rover++;
3492                 if ((rover < low) || (rover > high))
3493                         rover = low;
3494                 goto retry;
3495         }
3496         return -EADDRNOTAVAIL;
3497 }
3498
3499 /*
3500  * Check that the requested port is available.  This is called when trying to
3501  * bind to a specific port, or when trying to listen on a bound port.  In
3502  * the latter case, the provided id_priv may already be on the bind_list, but
3503  * we still need to check that it's okay to start listening.
3504  */
3505 static int cma_check_port(struct rdma_bind_list *bind_list,
3506                           struct rdma_id_private *id_priv, uint8_t reuseaddr)
3507 {
3508         struct rdma_id_private *cur_id;
3509         struct sockaddr *addr, *cur_addr;
3510
3511         lockdep_assert_held(&lock);
3512
3513         addr = cma_src_addr(id_priv);
3514         hlist_for_each_entry(cur_id, &bind_list->owners, node) {
3515                 if (id_priv == cur_id)
3516                         continue;
3517
3518                 if (reuseaddr && cur_id->reuseaddr)
3519                         continue;
3520
3521                 cur_addr = cma_src_addr(cur_id);
3522                 if (id_priv->afonly && cur_id->afonly &&
3523                     (addr->sa_family != cur_addr->sa_family))
3524                         continue;
3525
3526                 if (cma_any_addr(addr) || cma_any_addr(cur_addr))
3527                         return -EADDRNOTAVAIL;
3528
3529                 if (!cma_addr_cmp(addr, cur_addr))
3530                         return -EADDRINUSE;
3531         }
3532         return 0;
3533 }
3534
3535 static int cma_use_port(enum rdma_ucm_port_space ps,
3536                         struct rdma_id_private *id_priv)
3537 {
3538         struct rdma_bind_list *bind_list;
3539         unsigned short snum;
3540         int ret;
3541
3542         lockdep_assert_held(&lock);
3543
3544         snum = ntohs(cma_port(cma_src_addr(id_priv)));
3545         if (snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
3546                 return -EACCES;
3547
3548         bind_list = cma_ps_find(id_priv->id.route.addr.dev_addr.net, ps, snum);
3549         if (!bind_list) {
3550                 ret = cma_alloc_port(ps, id_priv, snum);
3551         } else {
3552                 ret = cma_check_port(bind_list, id_priv, id_priv->reuseaddr);
3553                 if (!ret)
3554                         cma_bind_port(bind_list, id_priv);
3555         }
3556         return ret;
3557 }
3558
3559 static enum rdma_ucm_port_space
3560 cma_select_inet_ps(struct rdma_id_private *id_priv)
3561 {
3562         switch (id_priv->id.ps) {
3563         case RDMA_PS_TCP:
3564         case RDMA_PS_UDP:
3565         case RDMA_PS_IPOIB:
3566         case RDMA_PS_IB:
3567                 return id_priv->id.ps;
3568         default:
3569
3570                 return 0;
3571         }
3572 }
3573
3574 static enum rdma_ucm_port_space
3575 cma_select_ib_ps(struct rdma_id_private *id_priv)
3576 {
3577         enum rdma_ucm_port_space ps = 0;
3578         struct sockaddr_ib *sib;
3579         u64 sid_ps, mask, sid;
3580
3581         sib = (struct sockaddr_ib *) cma_src_addr(id_priv);
3582         mask = be64_to_cpu(sib->sib_sid_mask) & RDMA_IB_IP_PS_MASK;
3583         sid = be64_to_cpu(sib->sib_sid) & mask;
3584
3585         if ((id_priv->id.ps == RDMA_PS_IB) && (sid == (RDMA_IB_IP_PS_IB & mask))) {
3586                 sid_ps = RDMA_IB_IP_PS_IB;
3587                 ps = RDMA_PS_IB;
3588         } else if (((id_priv->id.ps == RDMA_PS_IB) || (id_priv->id.ps == RDMA_PS_TCP)) &&
3589                    (sid == (RDMA_IB_IP_PS_TCP & mask))) {
3590                 sid_ps = RDMA_IB_IP_PS_TCP;
3591                 ps = RDMA_PS_TCP;
3592         } else if (((id_priv->id.ps == RDMA_PS_IB) || (id_priv->id.ps == RDMA_PS_UDP)) &&
3593                    (sid == (RDMA_IB_IP_PS_UDP & mask))) {
3594                 sid_ps = RDMA_IB_IP_PS_UDP;
3595                 ps = RDMA_PS_UDP;
3596         }
3597
3598         if (ps) {
3599                 sib->sib_sid = cpu_to_be64(sid_ps | ntohs(cma_port((struct sockaddr *) sib)));
3600                 sib->sib_sid_mask = cpu_to_be64(RDMA_IB_IP_PS_MASK |
3601                                                 be64_to_cpu(sib->sib_sid_mask));
3602         }
3603         return ps;
3604 }
3605
3606 static int cma_get_port(struct rdma_id_private *id_priv)
3607 {
3608         enum rdma_ucm_port_space ps;
3609         int ret;
3610
3611         if (cma_family(id_priv) != AF_IB)
3612                 ps = cma_select_inet_ps(id_priv);
3613         else
3614                 ps = cma_select_ib_ps(id_priv);
3615         if (!ps)
3616                 return -EPROTONOSUPPORT;
3617
3618         mutex_lock(&lock);
3619         if (cma_any_port(cma_src_addr(id_priv)))
3620                 ret = cma_alloc_any_port(ps, id_priv);
3621         else
3622                 ret = cma_use_port(ps, id_priv);
3623         mutex_unlock(&lock);
3624
3625         return ret;
3626 }
3627
3628 static int cma_check_linklocal(struct rdma_dev_addr *dev_addr,
3629                                struct sockaddr *addr)
3630 {
3631 #if IS_ENABLED(CONFIG_IPV6)
3632         struct sockaddr_in6 *sin6;
3633
3634         if (addr->sa_family != AF_INET6)
3635                 return 0;
3636
3637         sin6 = (struct sockaddr_in6 *) addr;
3638
3639         if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
3640                 return 0;
3641
3642         if (!sin6->sin6_scope_id)
3643                         return -EINVAL;
3644
3645         dev_addr->bound_dev_if = sin6->sin6_scope_id;
3646 #endif
3647         return 0;
3648 }
3649
3650 int rdma_listen(struct rdma_cm_id *id, int backlog)
3651 {
3652         struct rdma_id_private *id_priv =
3653                 container_of(id, struct rdma_id_private, id);
3654         int ret;
3655
3656         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_LISTEN)) {
3657                 /* For a well behaved ULP state will be RDMA_CM_IDLE */
3658                 id->route.addr.src_addr.ss_family = AF_INET;
3659                 ret = rdma_bind_addr(id, cma_src_addr(id_priv));
3660                 if (ret)
3661                         return ret;
3662                 if (WARN_ON(!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND,
3663                                            RDMA_CM_LISTEN)))
3664                         return -EINVAL;
3665         }
3666
3667         /*
3668          * Once the ID reaches RDMA_CM_LISTEN it is not allowed to be reusable
3669          * any more, and has to be unique in the bind list.
3670          */
3671         if (id_priv->reuseaddr) {
3672                 mutex_lock(&lock);
3673                 ret = cma_check_port(id_priv->bind_list, id_priv, 0);
3674                 if (!ret)
3675                         id_priv->reuseaddr = 0;
3676                 mutex_unlock(&lock);
3677                 if (ret)
3678                         goto err;
3679         }
3680
3681         id_priv->backlog = backlog;
3682         if (id->device) {
3683                 if (rdma_cap_ib_cm(id->device, 1)) {
3684                         ret = cma_ib_listen(id_priv);
3685                         if (ret)
3686                                 goto err;
3687                 } else if (rdma_cap_iw_cm(id->device, 1)) {
3688                         ret = cma_iw_listen(id_priv, backlog);
3689                         if (ret)
3690                                 goto err;
3691                 } else {
3692                         ret = -ENOSYS;
3693                         goto err;
3694                 }
3695         } else
3696                 cma_listen_on_all(id_priv);
3697
3698         return 0;
3699 err:
3700         id_priv->backlog = 0;
3701         /*
3702          * All the failure paths that lead here will not allow the req_handler's
3703          * to have run.
3704          */
3705         cma_comp_exch(id_priv, RDMA_CM_LISTEN, RDMA_CM_ADDR_BOUND);
3706         return ret;
3707 }
3708 EXPORT_SYMBOL(rdma_listen);
3709
3710 int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr)
3711 {
3712         struct rdma_id_private *id_priv;
3713         int ret;
3714         struct sockaddr  *daddr;
3715
3716         if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6 &&
3717             addr->sa_family != AF_IB)
3718                 return -EAFNOSUPPORT;
3719
3720         id_priv = container_of(id, struct rdma_id_private, id);
3721         if (!cma_comp_exch(id_priv, RDMA_CM_IDLE, RDMA_CM_ADDR_BOUND))
3722                 return -EINVAL;
3723
3724         ret = cma_check_linklocal(&id->route.addr.dev_addr, addr);
3725         if (ret)
3726                 goto err1;
3727
3728         memcpy(cma_src_addr(id_priv), addr, rdma_addr_size(addr));
3729         if (!cma_any_addr(addr)) {
3730                 ret = cma_translate_addr(addr, &id->route.addr.dev_addr);
3731                 if (ret)
3732                         goto err1;
3733
3734                 ret = cma_acquire_dev_by_src_ip(id_priv);
3735                 if (ret)
3736                         goto err1;
3737         }
3738
3739         if (!(id_priv->options & (1 << CMA_OPTION_AFONLY))) {
3740                 if (addr->sa_family == AF_INET)
3741                         id_priv->afonly = 1;
3742 #if IS_ENABLED(CONFIG_IPV6)
3743                 else if (addr->sa_family == AF_INET6) {
3744                         struct net *net = id_priv->id.route.addr.dev_addr.net;
3745
3746                         id_priv->afonly = net->ipv6.sysctl.bindv6only;
3747                 }
3748 #endif
3749         }
3750         daddr = cma_dst_addr(id_priv);
3751         daddr->sa_family = addr->sa_family;
3752
3753         ret = cma_get_port(id_priv);
3754         if (ret)
3755                 goto err2;
3756
3757         return 0;
3758 err2:
3759         if (id_priv->cma_dev)
3760                 cma_release_dev(id_priv);
3761 err1:
3762         cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_IDLE);
3763         return ret;
3764 }
3765 EXPORT_SYMBOL(rdma_bind_addr);
3766
3767 static int cma_format_hdr(void *hdr, struct rdma_id_private *id_priv)
3768 {
3769         struct cma_hdr *cma_hdr;
3770
3771         cma_hdr = hdr;
3772         cma_hdr->cma_version = CMA_VERSION;
3773         if (cma_family(id_priv) == AF_INET) {
3774                 struct sockaddr_in *src4, *dst4;
3775
3776                 src4 = (struct sockaddr_in *) cma_src_addr(id_priv);
3777                 dst4 = (struct sockaddr_in *) cma_dst_addr(id_priv);
3778
3779                 cma_set_ip_ver(cma_hdr, 4);
3780                 cma_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
3781                 cma_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
3782                 cma_hdr->port = src4->sin_port;
3783         } else if (cma_family(id_priv) == AF_INET6) {
3784                 struct sockaddr_in6 *src6, *dst6;
3785
3786                 src6 = (struct sockaddr_in6 *) cma_src_addr(id_priv);
3787                 dst6 = (struct sockaddr_in6 *) cma_dst_addr(id_priv);
3788
3789                 cma_set_ip_ver(cma_hdr, 6);
3790                 cma_hdr->src_addr.ip6 = src6->sin6_addr;
3791                 cma_hdr->dst_addr.ip6 = dst6->sin6_addr;
3792                 cma_hdr->port = src6->sin6_port;
3793         }
3794         return 0;
3795 }
3796
3797 static int cma_sidr_rep_handler(struct ib_cm_id *cm_id,
3798                                 const struct ib_cm_event *ib_event)
3799 {
3800         struct rdma_id_private *id_priv = cm_id->context;
3801         struct rdma_cm_event event = {};
3802         const struct ib_cm_sidr_rep_event_param *rep =
3803                                 &ib_event->param.sidr_rep_rcvd;
3804         int ret;
3805
3806         mutex_lock(&id_priv->handler_mutex);
3807         if (READ_ONCE(id_priv->state) != RDMA_CM_CONNECT)
3808                 goto out;
3809
3810         switch (ib_event->event) {
3811         case IB_CM_SIDR_REQ_ERROR:
3812                 event.event = RDMA_CM_EVENT_UNREACHABLE;
3813                 event.status = -ETIMEDOUT;
3814                 break;
3815         case IB_CM_SIDR_REP_RECEIVED:
3816                 event.param.ud.private_data = ib_event->private_data;
3817                 event.param.ud.private_data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
3818                 if (rep->status != IB_SIDR_SUCCESS) {
3819                         event.event = RDMA_CM_EVENT_UNREACHABLE;
3820                         event.status = ib_event->param.sidr_rep_rcvd.status;
3821                         pr_debug_ratelimited("RDMA CM: UNREACHABLE: bad SIDR reply. status %d\n",
3822                                              event.status);
3823                         break;
3824                 }
3825                 ret = cma_set_qkey(id_priv, rep->qkey);
3826                 if (ret) {
3827                         pr_debug_ratelimited("RDMA CM: ADDR_ERROR: failed to set qkey. status %d\n", ret);
3828                         event.event = RDMA_CM_EVENT_ADDR_ERROR;
3829                         event.status = ret;
3830                         break;
3831                 }
3832                 ib_init_ah_attr_from_path(id_priv->id.device,
3833                                           id_priv->id.port_num,
3834                                           id_priv->id.route.path_rec,
3835                                           &event.param.ud.ah_attr,
3836                                           rep->sgid_attr);
3837                 event.param.ud.qp_num = rep->qpn;
3838                 event.param.ud.qkey = rep->qkey;
3839                 event.event = RDMA_CM_EVENT_ESTABLISHED;
3840                 event.status = 0;
3841                 break;
3842         default:
3843                 pr_err("RDMA CMA: unexpected IB CM event: %d\n",
3844                        ib_event->event);
3845                 goto out;
3846         }
3847
3848         ret = cma_cm_event_handler(id_priv, &event);
3849
3850         rdma_destroy_ah_attr(&event.param.ud.ah_attr);
3851         if (ret) {
3852                 /* Destroy the CM ID by returning a non-zero value. */
3853                 id_priv->cm_id.ib = NULL;
3854                 destroy_id_handler_unlock(id_priv);
3855                 return ret;
3856         }
3857 out:
3858         mutex_unlock(&id_priv->handler_mutex);
3859         return 0;
3860 }
3861
3862 static int cma_resolve_ib_udp(struct rdma_id_private *id_priv,
3863                               struct rdma_conn_param *conn_param)
3864 {
3865         struct ib_cm_sidr_req_param req;
3866         struct ib_cm_id *id;
3867         void *private_data;
3868         u8 offset;
3869         int ret;
3870
3871         memset(&req, 0, sizeof req);
3872         offset = cma_user_data_offset(id_priv);
3873         req.private_data_len = offset + conn_param->private_data_len;
3874         if (req.private_data_len < conn_param->private_data_len)
3875                 return -EINVAL;
3876
3877         if (req.private_data_len) {
3878                 private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
3879                 if (!private_data)
3880                         return -ENOMEM;
3881         } else {
3882                 private_data = NULL;
3883         }
3884
3885         if (conn_param->private_data && conn_param->private_data_len)
3886                 memcpy(private_data + offset, conn_param->private_data,
3887                        conn_param->private_data_len);
3888
3889         if (private_data) {
3890                 ret = cma_format_hdr(private_data, id_priv);
3891                 if (ret)
3892                         goto out;
3893                 req.private_data = private_data;
3894         }
3895
3896         id = ib_create_cm_id(id_priv->id.device, cma_sidr_rep_handler,
3897                              id_priv);
3898         if (IS_ERR(id)) {
3899                 ret = PTR_ERR(id);
3900                 goto out;
3901         }
3902         id_priv->cm_id.ib = id;
3903
3904         req.path = id_priv->id.route.path_rec;
3905         req.sgid_attr = id_priv->id.route.addr.dev_addr.sgid_attr;
3906         req.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
3907         req.timeout_ms = 1 << (CMA_CM_RESPONSE_TIMEOUT - 8);
3908         req.max_cm_retries = CMA_MAX_CM_RETRIES;
3909
3910         trace_cm_send_sidr_req(id_priv);
3911         ret = ib_send_cm_sidr_req(id_priv->cm_id.ib, &req);
3912         if (ret) {
3913                 ib_destroy_cm_id(id_priv->cm_id.ib);
3914                 id_priv->cm_id.ib = NULL;
3915         }
3916 out:
3917         kfree(private_data);
3918         return ret;
3919 }
3920
3921 static int cma_connect_ib(struct rdma_id_private *id_priv,
3922                           struct rdma_conn_param *conn_param)
3923 {
3924         struct ib_cm_req_param req;
3925         struct rdma_route *route;
3926         void *private_data;
3927         struct ib_cm_id *id;
3928         u8 offset;
3929         int ret;
3930
3931         memset(&req, 0, sizeof req);
3932         offset = cma_user_data_offset(id_priv);
3933         req.private_data_len = offset + conn_param->private_data_len;
3934         if (req.private_data_len < conn_param->private_data_len)
3935                 return -EINVAL;
3936
3937         if (req.private_data_len) {
3938                 private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
3939                 if (!private_data)
3940                         return -ENOMEM;
3941         } else {
3942                 private_data = NULL;
3943         }
3944
3945         if (conn_param->private_data && conn_param->private_data_len)
3946                 memcpy(private_data + offset, conn_param->private_data,
3947                        conn_param->private_data_len);
3948
3949         id = ib_create_cm_id(id_priv->id.device, cma_ib_handler, id_priv);
3950         if (IS_ERR(id)) {
3951                 ret = PTR_ERR(id);
3952                 goto out;
3953         }
3954         id_priv->cm_id.ib = id;
3955
3956         route = &id_priv->id.route;
3957         if (private_data) {
3958                 ret = cma_format_hdr(private_data, id_priv);
3959                 if (ret)
3960                         goto out;
3961                 req.private_data = private_data;
3962         }
3963
3964         req.primary_path = &route->path_rec[0];
3965         if (route->num_paths == 2)
3966                 req.alternate_path = &route->path_rec[1];
3967
3968         req.ppath_sgid_attr = id_priv->id.route.addr.dev_addr.sgid_attr;
3969         /* Alternate path SGID attribute currently unsupported */
3970         req.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
3971         req.qp_num = id_priv->qp_num;
3972         req.qp_type = id_priv->id.qp_type;
3973         req.starting_psn = id_priv->seq_num;
3974         req.responder_resources = conn_param->responder_resources;
3975         req.initiator_depth = conn_param->initiator_depth;
3976         req.flow_control = conn_param->flow_control;
3977         req.retry_count = min_t(u8, 7, conn_param->retry_count);
3978         req.rnr_retry_count = min_t(u8, 7, conn_param->rnr_retry_count);
3979         req.remote_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
3980         req.local_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
3981         req.max_cm_retries = CMA_MAX_CM_RETRIES;
3982         req.srq = id_priv->srq ? 1 : 0;
3983         req.ece.vendor_id = id_priv->ece.vendor_id;
3984         req.ece.attr_mod = id_priv->ece.attr_mod;
3985
3986         trace_cm_send_req(id_priv);
3987         ret = ib_send_cm_req(id_priv->cm_id.ib, &req);
3988 out:
3989         if (ret && !IS_ERR(id)) {
3990                 ib_destroy_cm_id(id);
3991                 id_priv->cm_id.ib = NULL;
3992         }
3993
3994         kfree(private_data);
3995         return ret;
3996 }
3997
3998 static int cma_connect_iw(struct rdma_id_private *id_priv,
3999                           struct rdma_conn_param *conn_param)
4000 {
4001         struct iw_cm_id *cm_id;
4002         int ret;
4003         struct iw_cm_conn_param iw_param;
4004
4005         cm_id = iw_create_cm_id(id_priv->id.device, cma_iw_handler, id_priv);
4006         if (IS_ERR(cm_id))
4007                 return PTR_ERR(cm_id);
4008
4009         cm_id->tos = id_priv->tos;
4010         cm_id->tos_set = id_priv->tos_set;
4011         id_priv->cm_id.iw = cm_id;
4012
4013         memcpy(&cm_id->local_addr, cma_src_addr(id_priv),
4014                rdma_addr_size(cma_src_addr(id_priv)));
4015         memcpy(&cm_id->remote_addr, cma_dst_addr(id_priv),
4016                rdma_addr_size(cma_dst_addr(id_priv)));
4017
4018         ret = cma_modify_qp_rtr(id_priv, conn_param);
4019         if (ret)
4020                 goto out;
4021
4022         if (conn_param) {
4023                 iw_param.ord = conn_param->initiator_depth;
4024                 iw_param.ird = conn_param->responder_resources;
4025                 iw_param.private_data = conn_param->private_data;
4026                 iw_param.private_data_len = conn_param->private_data_len;
4027                 iw_param.qpn = id_priv->id.qp ? id_priv->qp_num : conn_param->qp_num;
4028         } else {
4029                 memset(&iw_param, 0, sizeof iw_param);
4030                 iw_param.qpn = id_priv->qp_num;
4031         }
4032         ret = iw_cm_connect(cm_id, &iw_param);
4033 out:
4034         if (ret) {
4035                 iw_destroy_cm_id(cm_id);
4036                 id_priv->cm_id.iw = NULL;
4037         }
4038         return ret;
4039 }
4040
4041 /**
4042  * rdma_connect_locked - Initiate an active connection request.
4043  * @id: Connection identifier to connect.
4044  * @conn_param: Connection information used for connected QPs.
4045  *
4046  * Same as rdma_connect() but can only be called from the
4047  * RDMA_CM_EVENT_ROUTE_RESOLVED handler callback.
4048  */
4049 int rdma_connect_locked(struct rdma_cm_id *id,
4050                         struct rdma_conn_param *conn_param)
4051 {
4052         struct rdma_id_private *id_priv =
4053                 container_of(id, struct rdma_id_private, id);
4054         int ret;
4055
4056         if (!cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_CONNECT))
4057                 return -EINVAL;
4058
4059         if (!id->qp) {
4060                 id_priv->qp_num = conn_param->qp_num;
4061                 id_priv->srq = conn_param->srq;
4062         }
4063
4064         if (rdma_cap_ib_cm(id->device, id->port_num)) {
4065                 if (id->qp_type == IB_QPT_UD)
4066                         ret = cma_resolve_ib_udp(id_priv, conn_param);
4067                 else
4068                         ret = cma_connect_ib(id_priv, conn_param);
4069         } else if (rdma_cap_iw_cm(id->device, id->port_num))
4070                 ret = cma_connect_iw(id_priv, conn_param);
4071         else
4072                 ret = -ENOSYS;
4073         if (ret)
4074                 goto err_state;
4075         return 0;
4076 err_state:
4077         cma_comp_exch(id_priv, RDMA_CM_CONNECT, RDMA_CM_ROUTE_RESOLVED);
4078         return ret;
4079 }
4080 EXPORT_SYMBOL(rdma_connect_locked);
4081
4082 /**
4083  * rdma_connect - Initiate an active connection request.
4084  * @id: Connection identifier to connect.
4085  * @conn_param: Connection information used for connected QPs.
4086  *
4087  * Users must have resolved a route for the rdma_cm_id to connect with by having
4088  * called rdma_resolve_route before calling this routine.
4089  *
4090  * This call will either connect to a remote QP or obtain remote QP information
4091  * for unconnected rdma_cm_id's.  The actual operation is based on the
4092  * rdma_cm_id's port space.
4093  */
4094 int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
4095 {
4096         struct rdma_id_private *id_priv =
4097                 container_of(id, struct rdma_id_private, id);
4098         int ret;
4099
4100         mutex_lock(&id_priv->handler_mutex);
4101         ret = rdma_connect_locked(id, conn_param);
4102         mutex_unlock(&id_priv->handler_mutex);
4103         return ret;
4104 }
4105 EXPORT_SYMBOL(rdma_connect);
4106
4107 /**
4108  * rdma_connect_ece - Initiate an active connection request with ECE data.
4109  * @id: Connection identifier to connect.
4110  * @conn_param: Connection information used for connected QPs.
4111  * @ece: ECE parameters
4112  *
4113  * See rdma_connect() explanation.
4114  */
4115 int rdma_connect_ece(struct rdma_cm_id *id, struct rdma_conn_param *conn_param,
4116                      struct rdma_ucm_ece *ece)
4117 {
4118         struct rdma_id_private *id_priv =
4119                 container_of(id, struct rdma_id_private, id);
4120
4121         id_priv->ece.vendor_id = ece->vendor_id;
4122         id_priv->ece.attr_mod = ece->attr_mod;
4123
4124         return rdma_connect(id, conn_param);
4125 }
4126 EXPORT_SYMBOL(rdma_connect_ece);
4127
4128 static int cma_accept_ib(struct rdma_id_private *id_priv,
4129                          struct rdma_conn_param *conn_param)
4130 {
4131         struct ib_cm_rep_param rep;
4132         int ret;
4133
4134         ret = cma_modify_qp_rtr(id_priv, conn_param);
4135         if (ret)
4136                 goto out;
4137
4138         ret = cma_modify_qp_rts(id_priv, conn_param);
4139         if (ret)
4140                 goto out;
4141
4142         memset(&rep, 0, sizeof rep);
4143         rep.qp_num = id_priv->qp_num;
4144         rep.starting_psn = id_priv->seq_num;
4145         rep.private_data = conn_param->private_data;
4146         rep.private_data_len = conn_param->private_data_len;
4147         rep.responder_resources = conn_param->responder_resources;
4148         rep.initiator_depth = conn_param->initiator_depth;
4149         rep.failover_accepted = 0;
4150         rep.flow_control = conn_param->flow_control;
4151         rep.rnr_retry_count = min_t(u8, 7, conn_param->rnr_retry_count);
4152         rep.srq = id_priv->srq ? 1 : 0;
4153         rep.ece.vendor_id = id_priv->ece.vendor_id;
4154         rep.ece.attr_mod = id_priv->ece.attr_mod;
4155
4156         trace_cm_send_rep(id_priv);
4157         ret = ib_send_cm_rep(id_priv->cm_id.ib, &rep);
4158 out:
4159         return ret;
4160 }
4161
4162 static int cma_accept_iw(struct rdma_id_private *id_priv,
4163                   struct rdma_conn_param *conn_param)
4164 {
4165         struct iw_cm_conn_param iw_param;
4166         int ret;
4167
4168         if (!conn_param)
4169                 return -EINVAL;
4170
4171         ret = cma_modify_qp_rtr(id_priv, conn_param);
4172         if (ret)
4173                 return ret;
4174
4175         iw_param.ord = conn_param->initiator_depth;
4176         iw_param.ird = conn_param->responder_resources;
4177         iw_param.private_data = conn_param->private_data;
4178         iw_param.private_data_len = conn_param->private_data_len;
4179         if (id_priv->id.qp) {
4180                 iw_param.qpn = id_priv->qp_num;
4181         } else
4182                 iw_param.qpn = conn_param->qp_num;
4183
4184         return iw_cm_accept(id_priv->cm_id.iw, &iw_param);
4185 }
4186
4187 static int cma_send_sidr_rep(struct rdma_id_private *id_priv,
4188                              enum ib_cm_sidr_status status, u32 qkey,
4189                              const void *private_data, int private_data_len)
4190 {
4191         struct ib_cm_sidr_rep_param rep;
4192         int ret;
4193
4194         memset(&rep, 0, sizeof rep);
4195         rep.status = status;
4196         if (status == IB_SIDR_SUCCESS) {
4197                 ret = cma_set_qkey(id_priv, qkey);
4198                 if (ret)
4199                         return ret;
4200                 rep.qp_num = id_priv->qp_num;
4201                 rep.qkey = id_priv->qkey;
4202
4203                 rep.ece.vendor_id = id_priv->ece.vendor_id;
4204                 rep.ece.attr_mod = id_priv->ece.attr_mod;
4205         }
4206
4207         rep.private_data = private_data;
4208         rep.private_data_len = private_data_len;
4209
4210         trace_cm_send_sidr_rep(id_priv);
4211         return ib_send_cm_sidr_rep(id_priv->cm_id.ib, &rep);
4212 }
4213
4214 /**
4215  * rdma_accept - Called to accept a connection request or response.
4216  * @id: Connection identifier associated with the request.
4217  * @conn_param: Information needed to establish the connection.  This must be
4218  *   provided if accepting a connection request.  If accepting a connection
4219  *   response, this parameter must be NULL.
4220  *
4221  * Typically, this routine is only called by the listener to accept a connection
4222  * request.  It must also be called on the active side of a connection if the
4223  * user is performing their own QP transitions.
4224  *
4225  * In the case of error, a reject message is sent to the remote side and the
4226  * state of the qp associated with the id is modified to error, such that any
4227  * previously posted receive buffers would be flushed.
4228  *
4229  * This function is for use by kernel ULPs and must be called from under the
4230  * handler callback.
4231  */
4232 int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
4233 {
4234         struct rdma_id_private *id_priv =
4235                 container_of(id, struct rdma_id_private, id);
4236         int ret;
4237
4238         lockdep_assert_held(&id_priv->handler_mutex);
4239
4240         if (READ_ONCE(id_priv->state) != RDMA_CM_CONNECT)
4241                 return -EINVAL;
4242
4243         if (!id->qp && conn_param) {
4244                 id_priv->qp_num = conn_param->qp_num;
4245                 id_priv->srq = conn_param->srq;
4246         }
4247
4248         if (rdma_cap_ib_cm(id->device, id->port_num)) {
4249                 if (id->qp_type == IB_QPT_UD) {
4250                         if (conn_param)
4251                                 ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
4252                                                         conn_param->qkey,
4253                                                         conn_param->private_data,
4254                                                         conn_param->private_data_len);
4255                         else
4256                                 ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
4257                                                         0, NULL, 0);
4258                 } else {
4259                         if (conn_param)
4260                                 ret = cma_accept_ib(id_priv, conn_param);
4261                         else
4262                                 ret = cma_rep_recv(id_priv);
4263                 }
4264         } else if (rdma_cap_iw_cm(id->device, id->port_num))
4265                 ret = cma_accept_iw(id_priv, conn_param);
4266         else
4267                 ret = -ENOSYS;
4268
4269         if (ret)
4270                 goto reject;
4271
4272         return 0;
4273 reject:
4274         cma_modify_qp_err(id_priv);
4275         rdma_reject(id, NULL, 0, IB_CM_REJ_CONSUMER_DEFINED);
4276         return ret;
4277 }
4278 EXPORT_SYMBOL(rdma_accept);
4279
4280 int rdma_accept_ece(struct rdma_cm_id *id, struct rdma_conn_param *conn_param,
4281                     struct rdma_ucm_ece *ece)
4282 {
4283         struct rdma_id_private *id_priv =
4284                 container_of(id, struct rdma_id_private, id);
4285
4286         id_priv->ece.vendor_id = ece->vendor_id;
4287         id_priv->ece.attr_mod = ece->attr_mod;
4288
4289         return rdma_accept(id, conn_param);
4290 }
4291 EXPORT_SYMBOL(rdma_accept_ece);
4292
4293 void rdma_lock_handler(struct rdma_cm_id *id)
4294 {
4295         struct rdma_id_private *id_priv =
4296                 container_of(id, struct rdma_id_private, id);
4297
4298         mutex_lock(&id_priv->handler_mutex);
4299 }
4300 EXPORT_SYMBOL(rdma_lock_handler);
4301
4302 void rdma_unlock_handler(struct rdma_cm_id *id)
4303 {
4304         struct rdma_id_private *id_priv =
4305                 container_of(id, struct rdma_id_private, id);
4306
4307         mutex_unlock(&id_priv->handler_mutex);
4308 }
4309 EXPORT_SYMBOL(rdma_unlock_handler);
4310
4311 int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event)
4312 {
4313         struct rdma_id_private *id_priv;
4314         int ret;
4315
4316         id_priv = container_of(id, struct rdma_id_private, id);
4317         if (!id_priv->cm_id.ib)
4318                 return -EINVAL;
4319
4320         switch (id->device->node_type) {
4321         case RDMA_NODE_IB_CA:
4322                 ret = ib_cm_notify(id_priv->cm_id.ib, event);
4323                 break;
4324         default:
4325                 ret = 0;
4326                 break;
4327         }
4328         return ret;
4329 }
4330 EXPORT_SYMBOL(rdma_notify);
4331
4332 int rdma_reject(struct rdma_cm_id *id, const void *private_data,
4333                 u8 private_data_len, u8 reason)
4334 {
4335         struct rdma_id_private *id_priv;
4336         int ret;
4337
4338         id_priv = container_of(id, struct rdma_id_private, id);
4339         if (!id_priv->cm_id.ib)
4340                 return -EINVAL;
4341
4342         if (rdma_cap_ib_cm(id->device, id->port_num)) {
4343                 if (id->qp_type == IB_QPT_UD) {
4344                         ret = cma_send_sidr_rep(id_priv, IB_SIDR_REJECT, 0,
4345                                                 private_data, private_data_len);
4346                 } else {
4347                         trace_cm_send_rej(id_priv);
4348                         ret = ib_send_cm_rej(id_priv->cm_id.ib, reason, NULL, 0,
4349                                              private_data, private_data_len);
4350                 }
4351         } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
4352                 ret = iw_cm_reject(id_priv->cm_id.iw,
4353                                    private_data, private_data_len);
4354         } else
4355                 ret = -ENOSYS;
4356
4357         return ret;
4358 }
4359 EXPORT_SYMBOL(rdma_reject);
4360
4361 int rdma_disconnect(struct rdma_cm_id *id)
4362 {
4363         struct rdma_id_private *id_priv;
4364         int ret;
4365
4366         id_priv = container_of(id, struct rdma_id_private, id);
4367         if (!id_priv->cm_id.ib)
4368                 return -EINVAL;
4369
4370         if (rdma_cap_ib_cm(id->device, id->port_num)) {
4371                 ret = cma_modify_qp_err(id_priv);
4372                 if (ret)
4373                         goto out;
4374                 /* Initiate or respond to a disconnect. */
4375                 trace_cm_disconnect(id_priv);
4376                 if (ib_send_cm_dreq(id_priv->cm_id.ib, NULL, 0)) {
4377                         if (!ib_send_cm_drep(id_priv->cm_id.ib, NULL, 0))
4378                                 trace_cm_sent_drep(id_priv);
4379                 } else {
4380                         trace_cm_sent_dreq(id_priv);
4381                 }
4382         } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
4383                 ret = iw_cm_disconnect(id_priv->cm_id.iw, 0);
4384         } else
4385                 ret = -EINVAL;
4386
4387 out:
4388         return ret;
4389 }
4390 EXPORT_SYMBOL(rdma_disconnect);
4391
4392 static void cma_make_mc_event(int status, struct rdma_id_private *id_priv,
4393                               struct ib_sa_multicast *multicast,
4394                               struct rdma_cm_event *event,
4395                               struct cma_multicast *mc)
4396 {
4397         struct rdma_dev_addr *dev_addr;
4398         enum ib_gid_type gid_type;
4399         struct net_device *ndev;
4400
4401         if (!status)
4402                 status = cma_set_qkey(id_priv, be32_to_cpu(multicast->rec.qkey));
4403         else
4404                 pr_debug_ratelimited("RDMA CM: MULTICAST_ERROR: failed to join multicast. status %d\n",
4405                                      status);
4406
4407         event->status = status;
4408         event->param.ud.private_data = mc->context;
4409         if (status) {
4410                 event->event = RDMA_CM_EVENT_MULTICAST_ERROR;
4411                 return;
4412         }
4413
4414         dev_addr = &id_priv->id.route.addr.dev_addr;
4415         ndev = dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if);
4416         gid_type =
4417                 id_priv->cma_dev
4418                         ->default_gid_type[id_priv->id.port_num -
4419                                            rdma_start_port(
4420                                                    id_priv->cma_dev->device)];
4421
4422         event->event = RDMA_CM_EVENT_MULTICAST_JOIN;
4423         if (ib_init_ah_from_mcmember(id_priv->id.device, id_priv->id.port_num,
4424                                      &multicast->rec, ndev, gid_type,
4425                                      &event->param.ud.ah_attr)) {
4426                 event->event = RDMA_CM_EVENT_MULTICAST_ERROR;
4427                 goto out;
4428         }
4429
4430         event->param.ud.qp_num = 0xFFFFFF;
4431         event->param.ud.qkey = be32_to_cpu(multicast->rec.qkey);
4432
4433 out:
4434         if (ndev)
4435                 dev_put(ndev);
4436 }
4437
4438 static int cma_ib_mc_handler(int status, struct ib_sa_multicast *multicast)
4439 {
4440         struct cma_multicast *mc = multicast->context;
4441         struct rdma_id_private *id_priv = mc->id_priv;
4442         struct rdma_cm_event event = {};
4443         int ret = 0;
4444
4445         mutex_lock(&id_priv->handler_mutex);
4446         if (READ_ONCE(id_priv->state) == RDMA_CM_DEVICE_REMOVAL ||
4447             READ_ONCE(id_priv->state) == RDMA_CM_DESTROYING)
4448                 goto out;
4449
4450         cma_make_mc_event(status, id_priv, multicast, &event, mc);
4451         ret = cma_cm_event_handler(id_priv, &event);
4452         rdma_destroy_ah_attr(&event.param.ud.ah_attr);
4453         if (ret) {
4454                 destroy_id_handler_unlock(id_priv);
4455                 return 0;
4456         }
4457
4458 out:
4459         mutex_unlock(&id_priv->handler_mutex);
4460         return 0;
4461 }
4462
4463 static void cma_set_mgid(struct rdma_id_private *id_priv,
4464                          struct sockaddr *addr, union ib_gid *mgid)
4465 {
4466         unsigned char mc_map[MAX_ADDR_LEN];
4467         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
4468         struct sockaddr_in *sin = (struct sockaddr_in *) addr;
4469         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) addr;
4470
4471         if (cma_any_addr(addr)) {
4472                 memset(mgid, 0, sizeof *mgid);
4473         } else if ((addr->sa_family == AF_INET6) &&
4474                    ((be32_to_cpu(sin6->sin6_addr.s6_addr32[0]) & 0xFFF0FFFF) ==
4475                                                                  0xFF10A01B)) {
4476                 /* IPv6 address is an SA assigned MGID. */
4477                 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
4478         } else if (addr->sa_family == AF_IB) {
4479                 memcpy(mgid, &((struct sockaddr_ib *) addr)->sib_addr, sizeof *mgid);
4480         } else if (addr->sa_family == AF_INET6) {
4481                 ipv6_ib_mc_map(&sin6->sin6_addr, dev_addr->broadcast, mc_map);
4482                 if (id_priv->id.ps == RDMA_PS_UDP)
4483                         mc_map[7] = 0x01;       /* Use RDMA CM signature */
4484                 *mgid = *(union ib_gid *) (mc_map + 4);
4485         } else {
4486                 ip_ib_mc_map(sin->sin_addr.s_addr, dev_addr->broadcast, mc_map);
4487                 if (id_priv->id.ps == RDMA_PS_UDP)
4488                         mc_map[7] = 0x01;       /* Use RDMA CM signature */
4489                 *mgid = *(union ib_gid *) (mc_map + 4);
4490         }
4491 }
4492
4493 static int cma_join_ib_multicast(struct rdma_id_private *id_priv,
4494                                  struct cma_multicast *mc)
4495 {
4496         struct ib_sa_mcmember_rec rec;
4497         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
4498         ib_sa_comp_mask comp_mask;
4499         int ret;
4500
4501         ib_addr_get_mgid(dev_addr, &rec.mgid);
4502         ret = ib_sa_get_mcmember_rec(id_priv->id.device, id_priv->id.port_num,
4503                                      &rec.mgid, &rec);
4504         if (ret)
4505                 return ret;
4506
4507         ret = cma_set_qkey(id_priv, 0);
4508         if (ret)
4509                 return ret;
4510
4511         cma_set_mgid(id_priv, (struct sockaddr *) &mc->addr, &rec.mgid);
4512         rec.qkey = cpu_to_be32(id_priv->qkey);
4513         rdma_addr_get_sgid(dev_addr, &rec.port_gid);
4514         rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
4515         rec.join_state = mc->join_state;
4516
4517         if ((rec.join_state == BIT(SENDONLY_FULLMEMBER_JOIN)) &&
4518             (!ib_sa_sendonly_fullmem_support(&sa_client,
4519                                              id_priv->id.device,
4520                                              id_priv->id.port_num))) {
4521                 dev_warn(
4522                         &id_priv->id.device->dev,
4523                         "RDMA CM: port %u Unable to multicast join: SM doesn't support Send Only Full Member option\n",
4524                         id_priv->id.port_num);
4525                 return -EOPNOTSUPP;
4526         }
4527
4528         comp_mask = IB_SA_MCMEMBER_REC_MGID | IB_SA_MCMEMBER_REC_PORT_GID |
4529                     IB_SA_MCMEMBER_REC_PKEY | IB_SA_MCMEMBER_REC_JOIN_STATE |
4530                     IB_SA_MCMEMBER_REC_QKEY | IB_SA_MCMEMBER_REC_SL |
4531                     IB_SA_MCMEMBER_REC_FLOW_LABEL |
4532                     IB_SA_MCMEMBER_REC_TRAFFIC_CLASS;
4533
4534         if (id_priv->id.ps == RDMA_PS_IPOIB)
4535                 comp_mask |= IB_SA_MCMEMBER_REC_RATE |
4536                              IB_SA_MCMEMBER_REC_RATE_SELECTOR |
4537                              IB_SA_MCMEMBER_REC_MTU_SELECTOR |
4538                              IB_SA_MCMEMBER_REC_MTU |
4539                              IB_SA_MCMEMBER_REC_HOP_LIMIT;
4540
4541         mc->sa_mc = ib_sa_join_multicast(&sa_client, id_priv->id.device,
4542                                          id_priv->id.port_num, &rec, comp_mask,
4543                                          GFP_KERNEL, cma_ib_mc_handler, mc);
4544         return PTR_ERR_OR_ZERO(mc->sa_mc);
4545 }
4546
4547 static void cma_iboe_set_mgid(struct sockaddr *addr, union ib_gid *mgid,
4548                               enum ib_gid_type gid_type)
4549 {
4550         struct sockaddr_in *sin = (struct sockaddr_in *)addr;
4551         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr;
4552
4553         if (cma_any_addr(addr)) {
4554                 memset(mgid, 0, sizeof *mgid);
4555         } else if (addr->sa_family == AF_INET6) {
4556                 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
4557         } else {
4558                 mgid->raw[0] =
4559                         (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) ? 0 : 0xff;
4560                 mgid->raw[1] =
4561                         (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) ? 0 : 0x0e;
4562                 mgid->raw[2] = 0;
4563                 mgid->raw[3] = 0;
4564                 mgid->raw[4] = 0;
4565                 mgid->raw[5] = 0;
4566                 mgid->raw[6] = 0;
4567                 mgid->raw[7] = 0;
4568                 mgid->raw[8] = 0;
4569                 mgid->raw[9] = 0;
4570                 mgid->raw[10] = 0xff;
4571                 mgid->raw[11] = 0xff;
4572                 *(__be32 *)(&mgid->raw[12]) = sin->sin_addr.s_addr;
4573         }
4574 }
4575
4576 static int cma_iboe_join_multicast(struct rdma_id_private *id_priv,
4577                                    struct cma_multicast *mc)
4578 {
4579         struct cma_work *work;
4580         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
4581         int err = 0;
4582         struct sockaddr *addr = (struct sockaddr *)&mc->addr;
4583         struct net_device *ndev = NULL;
4584         struct ib_sa_multicast ib;
4585         enum ib_gid_type gid_type;
4586         bool send_only;
4587
4588         send_only = mc->join_state == BIT(SENDONLY_FULLMEMBER_JOIN);
4589
4590         if (cma_zero_addr(addr))
4591                 return -EINVAL;
4592
4593         work = kzalloc(sizeof *work, GFP_KERNEL);
4594         if (!work)
4595                 return -ENOMEM;
4596
4597         gid_type = id_priv->cma_dev->default_gid_type[id_priv->id.port_num -
4598                    rdma_start_port(id_priv->cma_dev->device)];
4599         cma_iboe_set_mgid(addr, &ib.rec.mgid, gid_type);
4600
4601         ib.rec.pkey = cpu_to_be16(0xffff);
4602         if (id_priv->id.ps == RDMA_PS_UDP)
4603                 ib.rec.qkey = cpu_to_be32(RDMA_UDP_QKEY);
4604
4605         if (dev_addr->bound_dev_if)
4606                 ndev = dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if);
4607         if (!ndev) {
4608                 err = -ENODEV;
4609                 goto err_free;
4610         }
4611         ib.rec.rate = iboe_get_rate(ndev);
4612         ib.rec.hop_limit = 1;
4613         ib.rec.mtu = iboe_get_mtu(ndev->mtu);
4614
4615         if (addr->sa_family == AF_INET) {
4616                 if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) {
4617                         ib.rec.hop_limit = IPV6_DEFAULT_HOPLIMIT;
4618                         if (!send_only) {
4619                                 err = cma_igmp_send(ndev, &ib.rec.mgid,
4620                                                     true);
4621                         }
4622                 }
4623         } else {
4624                 if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP)
4625                         err = -ENOTSUPP;
4626         }
4627         dev_put(ndev);
4628         if (err || !ib.rec.mtu) {
4629                 if (!err)
4630                         err = -EINVAL;
4631                 goto err_free;
4632         }
4633         rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
4634                     &ib.rec.port_gid);
4635         work->id = id_priv;
4636         INIT_WORK(&work->work, cma_work_handler);
4637         cma_make_mc_event(0, id_priv, &ib, &work->event, mc);
4638         /* Balances with cma_id_put() in cma_work_handler */
4639         cma_id_get(id_priv);
4640         queue_work(cma_wq, &work->work);
4641         return 0;
4642
4643 err_free:
4644         kfree(work);
4645         return err;
4646 }
4647
4648 int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
4649                         u8 join_state, void *context)
4650 {
4651         struct rdma_id_private *id_priv =
4652                 container_of(id, struct rdma_id_private, id);
4653         struct cma_multicast *mc;
4654         int ret;
4655
4656         /* Not supported for kernel QPs */
4657         if (WARN_ON(id->qp))
4658                 return -EINVAL;
4659
4660         /* ULP is calling this wrong. */
4661         if (!id->device || (READ_ONCE(id_priv->state) != RDMA_CM_ADDR_BOUND &&
4662                             READ_ONCE(id_priv->state) != RDMA_CM_ADDR_RESOLVED))
4663                 return -EINVAL;
4664
4665         mc = kzalloc(sizeof(*mc), GFP_KERNEL);
4666         if (!mc)
4667                 return -ENOMEM;
4668
4669         memcpy(&mc->addr, addr, rdma_addr_size(addr));
4670         mc->context = context;
4671         mc->id_priv = id_priv;
4672         mc->join_state = join_state;
4673
4674         if (rdma_protocol_roce(id->device, id->port_num)) {
4675                 ret = cma_iboe_join_multicast(id_priv, mc);
4676                 if (ret)
4677                         goto out_err;
4678         } else if (rdma_cap_ib_mcast(id->device, id->port_num)) {
4679                 ret = cma_join_ib_multicast(id_priv, mc);
4680                 if (ret)
4681                         goto out_err;
4682         } else {
4683                 ret = -ENOSYS;
4684                 goto out_err;
4685         }
4686
4687         spin_lock(&id_priv->lock);
4688         list_add(&mc->list, &id_priv->mc_list);
4689         spin_unlock(&id_priv->lock);
4690
4691         return 0;
4692 out_err:
4693         kfree(mc);
4694         return ret;
4695 }
4696 EXPORT_SYMBOL(rdma_join_multicast);
4697
4698 void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr)
4699 {
4700         struct rdma_id_private *id_priv;
4701         struct cma_multicast *mc;
4702
4703         id_priv = container_of(id, struct rdma_id_private, id);
4704         spin_lock_irq(&id_priv->lock);
4705         list_for_each_entry(mc, &id_priv->mc_list, list) {
4706                 if (memcmp(&mc->addr, addr, rdma_addr_size(addr)) != 0)
4707                         continue;
4708                 list_del(&mc->list);
4709                 spin_unlock_irq(&id_priv->lock);
4710
4711                 WARN_ON(id_priv->cma_dev->device != id->device);
4712                 destroy_mc(id_priv, mc);
4713                 return;
4714         }
4715         spin_unlock_irq(&id_priv->lock);
4716 }
4717 EXPORT_SYMBOL(rdma_leave_multicast);
4718
4719 static int cma_netdev_change(struct net_device *ndev, struct rdma_id_private *id_priv)
4720 {
4721         struct rdma_dev_addr *dev_addr;
4722         struct cma_work *work;
4723
4724         dev_addr = &id_priv->id.route.addr.dev_addr;
4725
4726         if ((dev_addr->bound_dev_if == ndev->ifindex) &&
4727             (net_eq(dev_net(ndev), dev_addr->net)) &&
4728             memcmp(dev_addr->src_dev_addr, ndev->dev_addr, ndev->addr_len)) {
4729                 pr_info("RDMA CM addr change for ndev %s used by id %p\n",
4730                         ndev->name, &id_priv->id);
4731                 work = kzalloc(sizeof *work, GFP_KERNEL);
4732                 if (!work)
4733                         return -ENOMEM;
4734
4735                 INIT_WORK(&work->work, cma_work_handler);
4736                 work->id = id_priv;
4737                 work->event.event = RDMA_CM_EVENT_ADDR_CHANGE;
4738                 cma_id_get(id_priv);
4739                 queue_work(cma_wq, &work->work);
4740         }
4741
4742         return 0;
4743 }
4744
4745 static int cma_netdev_callback(struct notifier_block *self, unsigned long event,
4746                                void *ptr)
4747 {
4748         struct net_device *ndev = netdev_notifier_info_to_dev(ptr);
4749         struct cma_device *cma_dev;
4750         struct rdma_id_private *id_priv;
4751         int ret = NOTIFY_DONE;
4752
4753         if (event != NETDEV_BONDING_FAILOVER)
4754                 return NOTIFY_DONE;
4755
4756         if (!netif_is_bond_master(ndev))
4757                 return NOTIFY_DONE;
4758
4759         mutex_lock(&lock);
4760         list_for_each_entry(cma_dev, &dev_list, list)
4761                 list_for_each_entry(id_priv, &cma_dev->id_list, list) {
4762                         ret = cma_netdev_change(ndev, id_priv);
4763                         if (ret)
4764                                 goto out;
4765                 }
4766
4767 out:
4768         mutex_unlock(&lock);
4769         return ret;
4770 }
4771
4772 static struct notifier_block cma_nb = {
4773         .notifier_call = cma_netdev_callback
4774 };
4775
4776 static int cma_add_one(struct ib_device *device)
4777 {
4778         struct cma_device *cma_dev;
4779         struct rdma_id_private *id_priv;
4780         unsigned int i;
4781         unsigned long supported_gids = 0;
4782         int ret;
4783
4784         cma_dev = kmalloc(sizeof *cma_dev, GFP_KERNEL);
4785         if (!cma_dev)
4786                 return -ENOMEM;
4787
4788         cma_dev->device = device;
4789         cma_dev->default_gid_type = kcalloc(device->phys_port_cnt,
4790                                             sizeof(*cma_dev->default_gid_type),
4791                                             GFP_KERNEL);
4792         if (!cma_dev->default_gid_type) {
4793                 ret = -ENOMEM;
4794                 goto free_cma_dev;
4795         }
4796
4797         cma_dev->default_roce_tos = kcalloc(device->phys_port_cnt,
4798                                             sizeof(*cma_dev->default_roce_tos),
4799                                             GFP_KERNEL);
4800         if (!cma_dev->default_roce_tos) {
4801                 ret = -ENOMEM;
4802                 goto free_gid_type;
4803         }
4804
4805         rdma_for_each_port (device, i) {
4806                 supported_gids = roce_gid_type_mask_support(device, i);
4807                 WARN_ON(!supported_gids);
4808                 if (supported_gids & (1 << CMA_PREFERRED_ROCE_GID_TYPE))
4809                         cma_dev->default_gid_type[i - rdma_start_port(device)] =
4810                                 CMA_PREFERRED_ROCE_GID_TYPE;
4811                 else
4812                         cma_dev->default_gid_type[i - rdma_start_port(device)] =
4813                                 find_first_bit(&supported_gids, BITS_PER_LONG);
4814                 cma_dev->default_roce_tos[i - rdma_start_port(device)] = 0;
4815         }
4816
4817         init_completion(&cma_dev->comp);
4818         refcount_set(&cma_dev->refcount, 1);
4819         INIT_LIST_HEAD(&cma_dev->id_list);
4820         ib_set_client_data(device, &cma_client, cma_dev);
4821
4822         mutex_lock(&lock);
4823         list_add_tail(&cma_dev->list, &dev_list);
4824         list_for_each_entry(id_priv, &listen_any_list, list)
4825                 cma_listen_on_dev(id_priv, cma_dev);
4826         mutex_unlock(&lock);
4827
4828         trace_cm_add_one(device);
4829         return 0;
4830
4831 free_gid_type:
4832         kfree(cma_dev->default_gid_type);
4833
4834 free_cma_dev:
4835         kfree(cma_dev);
4836         return ret;
4837 }
4838
4839 static void cma_send_device_removal_put(struct rdma_id_private *id_priv)
4840 {
4841         struct rdma_cm_event event = { .event = RDMA_CM_EVENT_DEVICE_REMOVAL };
4842         enum rdma_cm_state state;
4843         unsigned long flags;
4844
4845         mutex_lock(&id_priv->handler_mutex);
4846         /* Record that we want to remove the device */
4847         spin_lock_irqsave(&id_priv->lock, flags);
4848         state = id_priv->state;
4849         if (state == RDMA_CM_DESTROYING || state == RDMA_CM_DEVICE_REMOVAL) {
4850                 spin_unlock_irqrestore(&id_priv->lock, flags);
4851                 mutex_unlock(&id_priv->handler_mutex);
4852                 cma_id_put(id_priv);
4853                 return;
4854         }
4855         id_priv->state = RDMA_CM_DEVICE_REMOVAL;
4856         spin_unlock_irqrestore(&id_priv->lock, flags);
4857
4858         if (cma_cm_event_handler(id_priv, &event)) {
4859                 /*
4860                  * At this point the ULP promises it won't call
4861                  * rdma_destroy_id() concurrently
4862                  */
4863                 cma_id_put(id_priv);
4864                 mutex_unlock(&id_priv->handler_mutex);
4865                 trace_cm_id_destroy(id_priv);
4866                 _destroy_id(id_priv, state);
4867                 return;
4868         }
4869         mutex_unlock(&id_priv->handler_mutex);
4870
4871         /*
4872          * If this races with destroy then the thread that first assigns state
4873          * to a destroying does the cancel.
4874          */
4875         cma_cancel_operation(id_priv, state);
4876         cma_id_put(id_priv);
4877 }
4878
4879 static void cma_process_remove(struct cma_device *cma_dev)
4880 {
4881         mutex_lock(&lock);
4882         while (!list_empty(&cma_dev->id_list)) {
4883                 struct rdma_id_private *id_priv = list_first_entry(
4884                         &cma_dev->id_list, struct rdma_id_private, list);
4885
4886                 list_del(&id_priv->listen_list);
4887                 list_del_init(&id_priv->list);
4888                 cma_id_get(id_priv);
4889                 mutex_unlock(&lock);
4890
4891                 cma_send_device_removal_put(id_priv);
4892
4893                 mutex_lock(&lock);
4894         }
4895         mutex_unlock(&lock);
4896
4897         cma_dev_put(cma_dev);
4898         wait_for_completion(&cma_dev->comp);
4899 }
4900
4901 static void cma_remove_one(struct ib_device *device, void *client_data)
4902 {
4903         struct cma_device *cma_dev = client_data;
4904
4905         trace_cm_remove_one(device);
4906
4907         mutex_lock(&lock);
4908         list_del(&cma_dev->list);
4909         mutex_unlock(&lock);
4910
4911         cma_process_remove(cma_dev);
4912         kfree(cma_dev->default_roce_tos);
4913         kfree(cma_dev->default_gid_type);
4914         kfree(cma_dev);
4915 }
4916
4917 static int cma_init_net(struct net *net)
4918 {
4919         struct cma_pernet *pernet = cma_pernet(net);
4920
4921         xa_init(&pernet->tcp_ps);
4922         xa_init(&pernet->udp_ps);
4923         xa_init(&pernet->ipoib_ps);
4924         xa_init(&pernet->ib_ps);
4925
4926         return 0;
4927 }
4928
4929 static void cma_exit_net(struct net *net)
4930 {
4931         struct cma_pernet *pernet = cma_pernet(net);
4932
4933         WARN_ON(!xa_empty(&pernet->tcp_ps));
4934         WARN_ON(!xa_empty(&pernet->udp_ps));
4935         WARN_ON(!xa_empty(&pernet->ipoib_ps));
4936         WARN_ON(!xa_empty(&pernet->ib_ps));
4937 }
4938
4939 static struct pernet_operations cma_pernet_operations = {
4940         .init = cma_init_net,
4941         .exit = cma_exit_net,
4942         .id = &cma_pernet_id,
4943         .size = sizeof(struct cma_pernet),
4944 };
4945
4946 static int __init cma_init(void)
4947 {
4948         int ret;
4949
4950         /*
4951          * There is a rare lock ordering dependency in cma_netdev_callback()
4952          * that only happens when bonding is enabled. Teach lockdep that rtnl
4953          * must never be nested under lock so it can find these without having
4954          * to test with bonding.
4955          */
4956         if (IS_ENABLED(CONFIG_LOCKDEP)) {
4957                 rtnl_lock();
4958                 mutex_lock(&lock);
4959                 mutex_unlock(&lock);
4960                 rtnl_unlock();
4961         }
4962
4963         cma_wq = alloc_ordered_workqueue("rdma_cm", WQ_MEM_RECLAIM);
4964         if (!cma_wq)
4965                 return -ENOMEM;
4966
4967         ret = register_pernet_subsys(&cma_pernet_operations);
4968         if (ret)
4969                 goto err_wq;
4970
4971         ib_sa_register_client(&sa_client);
4972         register_netdevice_notifier(&cma_nb);
4973
4974         ret = ib_register_client(&cma_client);
4975         if (ret)
4976                 goto err;
4977
4978         ret = cma_configfs_init();
4979         if (ret)
4980                 goto err_ib;
4981
4982         return 0;
4983
4984 err_ib:
4985         ib_unregister_client(&cma_client);
4986 err:
4987         unregister_netdevice_notifier(&cma_nb);
4988         ib_sa_unregister_client(&sa_client);
4989         unregister_pernet_subsys(&cma_pernet_operations);
4990 err_wq:
4991         destroy_workqueue(cma_wq);
4992         return ret;
4993 }
4994
4995 static void __exit cma_cleanup(void)
4996 {
4997         cma_configfs_exit();
4998         ib_unregister_client(&cma_client);
4999         unregister_netdevice_notifier(&cma_nb);
5000         ib_sa_unregister_client(&sa_client);
5001         unregister_pernet_subsys(&cma_pernet_operations);
5002         destroy_workqueue(cma_wq);
5003 }
5004
5005 module_init(cma_init);
5006 module_exit(cma_cleanup);