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/rbtree.h>
  15 #include <linux/igmp.h>
  16 #include <linux/xarray.h>
  17 #include <linux/inetdevice.h>
  18 #include <linux/slab.h>
  19 #include <linux/module.h>
  20 #include <net/route.h>
  21
  22 #include <net/net_namespace.h>
  23 #include <net/netns/generic.h>
  24 #include <net/netevent.h>
  25 #include <net/tcp.h>
  26 #include <net/ipv6.h>
  27 #include <net/ip_fib.h>
  28 #include <net/ip6_route.h>
  29
  30 #include <rdma/rdma_cm.h>
  31 #include <rdma/rdma_cm_ib.h>
  32 #include <rdma/rdma_netlink.h>
  33 #include <rdma/ib.h>
  34 #include <rdma/ib_cache.h>
  35 #include <rdma/ib_cm.h>
  36 #include <rdma/ib_sa.h>
  37 #include <rdma/iw_cm.h>
  38
  39 #include "core_priv.h"
  40 #include "cma_priv.h"
  41 #include "cma_trace.h"
  42
  43 MODULE_AUTHOR("Sean Hefty");
  44 MODULE_DESCRIPTION("Generic RDMA CM Agent");
  45 MODULE_LICENSE("Dual BSD/GPL");
  46
  47 #define CMA_CM_RESPONSE_TIMEOUT 20
  48 #define CMA_MAX_CM_RETRIES 15
  49 #define CMA_CM_MRA_SETTING (IB_CM_MRA_FLAG_DELAY | 24)
  50 #define CMA_IBOE_PACKET_LIFETIME 18
  51 #define CMA_PREFERRED_ROCE_GID_TYPE IB_GID_TYPE_ROCE_UDP_ENCAP
  52
  53 static const char * const cma_events[] = {
  54         [RDMA_CM_EVENT_ADDR_RESOLVED]    = "address resolved",
  55         [RDMA_CM_EVENT_ADDR_ERROR]       = "address error",
  56         [RDMA_CM_EVENT_ROUTE_RESOLVED]   = "route resolved ",
  57         [RDMA_CM_EVENT_ROUTE_ERROR]      = "route error",
  58         [RDMA_CM_EVENT_CONNECT_REQUEST]  = "connect request",
  59         [RDMA_CM_EVENT_CONNECT_RESPONSE] = "connect response",
  60         [RDMA_CM_EVENT_CONNECT_ERROR]    = "connect error",
  61         [RDMA_CM_EVENT_UNREACHABLE]      = "unreachable",
  62         [RDMA_CM_EVENT_REJECTED]         = "rejected",
  63         [RDMA_CM_EVENT_ESTABLISHED]      = "established",
  64         [RDMA_CM_EVENT_DISCONNECTED]     = "disconnected",
  65         [RDMA_CM_EVENT_DEVICE_REMOVAL]   = "device removal",
  66         [RDMA_CM_EVENT_MULTICAST_JOIN]   = "multicast join",
  67         [RDMA_CM_EVENT_MULTICAST_ERROR]  = "multicast error",
  68         [RDMA_CM_EVENT_ADDR_CHANGE]      = "address change",
  69         [RDMA_CM_EVENT_TIMEWAIT_EXIT]    = "timewait exit",
  70 };
  71
  72 static void cma_iboe_set_mgid(struct sockaddr *addr, union ib_gid *mgid,
  73                               enum ib_gid_type gid_type);
  74
  75 const char *__attribute_const__ rdma_event_msg(enum rdma_cm_event_type event)
  76 {
  77         size_t index = event;
  78
  79         return (index < ARRAY_SIZE(cma_events) && cma_events[index]) ?
  80                         cma_events[index] : "unrecognized event";
  81 }
  82 EXPORT_SYMBOL(rdma_event_msg);
  83
  84 const char *__attribute_const__ rdma_reject_msg(struct rdma_cm_id *id,
  85                                                 int reason)
  86 {
  87         if (rdma_ib_or_roce(id->device, id->port_num))
  88                 return ibcm_reject_msg(reason);
  89
  90         if (rdma_protocol_iwarp(id->device, id->port_num))
  91                 return iwcm_reject_msg(reason);
  92
  93         WARN_ON_ONCE(1);
  94         return "unrecognized transport";
  95 }
  96 EXPORT_SYMBOL(rdma_reject_msg);
  97
  98 /**
  99  * rdma_is_consumer_reject - return true if the consumer rejected the connect
 100  *                           request.
 101  * @id: Communication identifier that received the REJECT event.
 102  * @reason: Value returned in the REJECT event status field.
 103  */
 104 static bool rdma_is_consumer_reject(struct rdma_cm_id *id, int reason)
 105 {
 106         if (rdma_ib_or_roce(id->device, id->port_num))
 107                 return reason == IB_CM_REJ_CONSUMER_DEFINED;
 108
 109         if (rdma_protocol_iwarp(id->device, id->port_num))
 110                 return reason == -ECONNREFUSED;
 111
 112         WARN_ON_ONCE(1);
 113         return false;
 114 }
 115
 116 const void *rdma_consumer_reject_data(struct rdma_cm_id *id,
 117                                       struct rdma_cm_event *ev, u8 *data_len)
 118 {
 119         const void *p;
 120
 121         if (rdma_is_consumer_reject(id, ev->status)) {
 122                 *data_len = ev->param.conn.private_data_len;
 123                 p = ev->param.conn.private_data;
 124         } else {
 125                 *data_len = 0;
 126                 p = NULL;
 127         }
 128         return p;
 129 }
 130 EXPORT_SYMBOL(rdma_consumer_reject_data);
 131
 132 /**
 133  * rdma_iw_cm_id() - return the iw_cm_id pointer for this cm_id.
 134  * @id: Communication Identifier
 135  */
 136 struct iw_cm_id *rdma_iw_cm_id(struct rdma_cm_id *id)
 137 {
 138         struct rdma_id_private *id_priv;
 139
 140         id_priv = container_of(id, struct rdma_id_private, id);
 141         if (id->device->node_type == RDMA_NODE_RNIC)
 142                 return id_priv->cm_id.iw;
 143         return NULL;
 144 }
 145 EXPORT_SYMBOL(rdma_iw_cm_id);
 146
 147 /**
 148  * rdma_res_to_id() - return the rdma_cm_id pointer for this restrack.
 149  * @res: rdma resource tracking entry pointer
 150  */
 151 struct rdma_cm_id *rdma_res_to_id(struct rdma_restrack_entry *res)
 152 {
 153         struct rdma_id_private *id_priv =
 154                 container_of(res, struct rdma_id_private, res);
 155
 156         return &id_priv->id;
 157 }
 158 EXPORT_SYMBOL(rdma_res_to_id);
 159
 160 static int cma_add_one(struct ib_device *device);
 161 static void cma_remove_one(struct ib_device *device, void *client_data);
 162
 163 static struct ib_client cma_client = {
 164         .name   = "cma",
 165         .add    = cma_add_one,
 166         .remove = cma_remove_one
 167 };
 168
 169 static struct ib_sa_client sa_client;
 170 static LIST_HEAD(dev_list);
 171 static LIST_HEAD(listen_any_list);
 172 static DEFINE_MUTEX(lock);
 173 static struct rb_root id_table = RB_ROOT;
 174 /* Serialize operations of id_table tree */
 175 static DEFINE_SPINLOCK(id_table_lock);
 176 static struct workqueue_struct *cma_wq;
 177 static unsigned int cma_pernet_id;
 178
 179 struct cma_pernet {
 180         struct xarray tcp_ps;
 181         struct xarray udp_ps;
 182         struct xarray ipoib_ps;
 183         struct xarray ib_ps;
 184 };
 185
 186 static struct cma_pernet *cma_pernet(struct net *net)
 187 {
 188         return net_generic(net, cma_pernet_id);
 189 }
 190
 191 static
 192 struct xarray *cma_pernet_xa(struct net *net, enum rdma_ucm_port_space ps)
 193 {
 194         struct cma_pernet *pernet = cma_pernet(net);
 195
 196         switch (ps) {
 197         case RDMA_PS_TCP:
 198                 return &pernet->tcp_ps;
 199         case RDMA_PS_UDP:
 200                 return &pernet->udp_ps;
 201         case RDMA_PS_IPOIB:
 202                 return &pernet->ipoib_ps;
 203         case RDMA_PS_IB:
 204                 return &pernet->ib_ps;
 205         default:
 206                 return NULL;
 207         }
 208 }
 209
 210 struct id_table_entry {
 211         struct list_head id_list;
 212         struct rb_node rb_node;
 213 };
 214
 215 struct cma_device {
 216         struct list_head        list;
 217         struct ib_device        *device;
 218         struct completion       comp;
 219         refcount_t refcount;
 220         struct list_head        id_list;
 221         enum ib_gid_type        *default_gid_type;
 222         u8                      *default_roce_tos;
 223 };
 224
 225 struct rdma_bind_list {
 226         enum rdma_ucm_port_space ps;
 227         struct hlist_head       owners;
 228         unsigned short          port;
 229 };
 230
 231 static int cma_ps_alloc(struct net *net, enum rdma_ucm_port_space ps,
 232                         struct rdma_bind_list *bind_list, int snum)
 233 {
 234         struct xarray *xa = cma_pernet_xa(net, ps);
 235
 236         return xa_insert(xa, snum, bind_list, GFP_KERNEL);
 237 }
 238
 239 static struct rdma_bind_list *cma_ps_find(struct net *net,
 240                                           enum rdma_ucm_port_space ps, int snum)
 241 {
 242         struct xarray *xa = cma_pernet_xa(net, ps);
 243
 244         return xa_load(xa, snum);
 245 }
 246
 247 static void cma_ps_remove(struct net *net, enum rdma_ucm_port_space ps,
 248                           int snum)
 249 {
 250         struct xarray *xa = cma_pernet_xa(net, ps);
 251
 252         xa_erase(xa, snum);
 253 }
 254
 255 enum {
 256         CMA_OPTION_AFONLY,
 257 };
 258
 259 void cma_dev_get(struct cma_device *cma_dev)
 260 {
 261         refcount_inc(&cma_dev->refcount);
 262 }
 263
 264 void cma_dev_put(struct cma_device *cma_dev)
 265 {
 266         if (refcount_dec_and_test(&cma_dev->refcount))
 267                 complete(&cma_dev->comp);
 268 }
 269
 270 struct cma_device *cma_enum_devices_by_ibdev(cma_device_filter  filter,
 271                                              void               *cookie)
 272 {
 273         struct cma_device *cma_dev;
 274         struct cma_device *found_cma_dev = NULL;
 275
 276         mutex_lock(&lock);
 277
 278         list_for_each_entry(cma_dev, &dev_list, list)
 279                 if (filter(cma_dev->device, cookie)) {
 280                         found_cma_dev = cma_dev;
 281                         break;
 282                 }
 283
 284         if (found_cma_dev)
 285                 cma_dev_get(found_cma_dev);
 286         mutex_unlock(&lock);
 287         return found_cma_dev;
 288 }
 289
 290 int cma_get_default_gid_type(struct cma_device *cma_dev,
 291                              u32 port)
 292 {
 293         if (!rdma_is_port_valid(cma_dev->device, port))
 294                 return -EINVAL;
 295
 296         return cma_dev->default_gid_type[port - rdma_start_port(cma_dev->device)];
 297 }
 298
 299 int cma_set_default_gid_type(struct cma_device *cma_dev,
 300                              u32 port,
 301                              enum ib_gid_type default_gid_type)
 302 {
 303         unsigned long supported_gids;
 304
 305         if (!rdma_is_port_valid(cma_dev->device, port))
 306                 return -EINVAL;
 307
 308         if (default_gid_type == IB_GID_TYPE_IB &&
 309             rdma_protocol_roce_eth_encap(cma_dev->device, port))
 310                 default_gid_type = IB_GID_TYPE_ROCE;
 311
 312         supported_gids = roce_gid_type_mask_support(cma_dev->device, port);
 313
 314         if (!(supported_gids & 1 << default_gid_type))
 315                 return -EINVAL;
 316
 317         cma_dev->default_gid_type[port - rdma_start_port(cma_dev->device)] =
 318                 default_gid_type;
 319
 320         return 0;
 321 }
 322
 323 int cma_get_default_roce_tos(struct cma_device *cma_dev, u32 port)
 324 {
 325         if (!rdma_is_port_valid(cma_dev->device, port))
 326                 return -EINVAL;
 327
 328         return cma_dev->default_roce_tos[port - rdma_start_port(cma_dev->device)];
 329 }
 330
 331 int cma_set_default_roce_tos(struct cma_device *cma_dev, u32 port,
 332                              u8 default_roce_tos)
 333 {
 334         if (!rdma_is_port_valid(cma_dev->device, port))
 335                 return -EINVAL;
 336
 337         cma_dev->default_roce_tos[port - rdma_start_port(cma_dev->device)] =
 338                  default_roce_tos;
 339
 340         return 0;
 341 }
 342 struct ib_device *cma_get_ib_dev(struct cma_device *cma_dev)
 343 {
 344         return cma_dev->device;
 345 }
 346
 347 /*
 348  * Device removal can occur at anytime, so we need extra handling to
 349  * serialize notifying the user of device removal with other callbacks.
 350  * We do this by disabling removal notification while a callback is in process,
 351  * and reporting it after the callback completes.
 352  */
 353
 354 struct cma_multicast {
 355         struct rdma_id_private *id_priv;
 356         union {
 357                 struct ib_sa_multicast *sa_mc;
 358                 struct {
 359                         struct work_struct work;
 360                         struct rdma_cm_event event;
 361                 } iboe_join;
 362         };
 363         struct list_head        list;
 364         void                    *context;
 365         struct sockaddr_storage addr;
 366         u8                      join_state;
 367 };
 368
 369 struct cma_work {
 370         struct work_struct      work;
 371         struct rdma_id_private  *id;
 372         enum rdma_cm_state      old_state;
 373         enum rdma_cm_state      new_state;
 374         struct rdma_cm_event    event;
 375 };
 376
 377 union cma_ip_addr {
 378         struct in6_addr ip6;
 379         struct {
 380                 __be32 pad[3];
 381                 __be32 addr;
 382         } ip4;
 383 };
 384
 385 struct cma_hdr {
 386         u8 cma_version;
 387         u8 ip_version;  /* IP version: 7:4 */
 388         __be16 port;
 389         union cma_ip_addr src_addr;
 390         union cma_ip_addr dst_addr;
 391 };
 392
 393 #define CMA_VERSION 0x00
 394
 395 struct cma_req_info {
 396         struct sockaddr_storage listen_addr_storage;
 397         struct sockaddr_storage src_addr_storage;
 398         struct ib_device *device;
 399         union ib_gid local_gid;
 400         __be64 service_id;
 401         int port;
 402         bool has_gid;
 403         u16 pkey;
 404 };
 405
 406 static int cma_comp_exch(struct rdma_id_private *id_priv,
 407                          enum rdma_cm_state comp, enum rdma_cm_state exch)
 408 {
 409         unsigned long flags;
 410         int ret;
 411
 412         /*
 413          * The FSM uses a funny double locking where state is protected by both
 414          * the handler_mutex and the spinlock. State is not allowed to change
 415          * to/from a handler_mutex protected value without also holding
 416          * handler_mutex.
 417          */
 418         if (comp == RDMA_CM_CONNECT || exch == RDMA_CM_CONNECT)
 419                 lockdep_assert_held(&id_priv->handler_mutex);
 420
 421         spin_lock_irqsave(&id_priv->lock, flags);
 422         if ((ret = (id_priv->state == comp)))
 423                 id_priv->state = exch;
 424         spin_unlock_irqrestore(&id_priv->lock, flags);
 425         return ret;
 426 }
 427
 428 static inline u8 cma_get_ip_ver(const struct cma_hdr *hdr)
 429 {
 430         return hdr->ip_version >> 4;
 431 }
 432
 433 static void cma_set_ip_ver(struct cma_hdr *hdr, u8 ip_ver)
 434 {
 435         hdr->ip_version = (ip_ver << 4) | (hdr->ip_version & 0xF);
 436 }
 437
 438 static struct sockaddr *cma_src_addr(struct rdma_id_private *id_priv)
 439 {
 440         return (struct sockaddr *)&id_priv->id.route.addr.src_addr;
 441 }
 442
 443 static inline struct sockaddr *cma_dst_addr(struct rdma_id_private *id_priv)
 444 {
 445         return (struct sockaddr *)&id_priv->id.route.addr.dst_addr;
 446 }
 447
 448 static int cma_igmp_send(struct net_device *ndev, union ib_gid *mgid, bool join)
 449 {
 450         struct in_device *in_dev = NULL;
 451
 452         if (ndev) {
 453                 rtnl_lock();
 454                 in_dev = __in_dev_get_rtnl(ndev);
 455                 if (in_dev) {
 456                         if (join)
 457                                 ip_mc_inc_group(in_dev,
 458                                                 *(__be32 *)(mgid->raw + 12));
 459                         else
 460                                 ip_mc_dec_group(in_dev,
 461                                                 *(__be32 *)(mgid->raw + 12));
 462                 }
 463                 rtnl_unlock();
 464         }
 465         return (in_dev) ? 0 : -ENODEV;
 466 }
 467
 468 static int compare_netdev_and_ip(int ifindex_a, struct sockaddr *sa,
 469                                  struct id_table_entry *entry_b)
 470 {
 471         struct rdma_id_private *id_priv = list_first_entry(
 472                 &entry_b->id_list, struct rdma_id_private, id_list_entry);
 473         int ifindex_b = id_priv->id.route.addr.dev_addr.bound_dev_if;
 474         struct sockaddr *sb = cma_dst_addr(id_priv);
 475
 476         if (ifindex_a != ifindex_b)
 477                 return (ifindex_a > ifindex_b) ? 1 : -1;
 478
 479         if (sa->sa_family != sb->sa_family)
 480                 return sa->sa_family - sb->sa_family;
 481
 482         if (sa->sa_family == AF_INET)
 483                 return memcmp((char *)&((struct sockaddr_in *)sa)->sin_addr,
 484                               (char *)&((struct sockaddr_in *)sb)->sin_addr,
 485                               sizeof(((struct sockaddr_in *)sa)->sin_addr));
 486
 487         return ipv6_addr_cmp(&((struct sockaddr_in6 *)sa)->sin6_addr,
 488                              &((struct sockaddr_in6 *)sb)->sin6_addr);
 489 }
 490
 491 static int cma_add_id_to_tree(struct rdma_id_private *node_id_priv)
 492 {
 493         struct rb_node **new, *parent = NULL;
 494         struct id_table_entry *this, *node;
 495         unsigned long flags;
 496         int result;
 497
 498         node = kzalloc(sizeof(*node), GFP_KERNEL);
 499         if (!node)
 500                 return -ENOMEM;
 501
 502         spin_lock_irqsave(&id_table_lock, flags);
 503         new = &id_table.rb_node;
 504         while (*new) {
 505                 this = container_of(*new, struct id_table_entry, rb_node);
 506                 result = compare_netdev_and_ip(
 507                         node_id_priv->id.route.addr.dev_addr.bound_dev_if,
 508                         cma_dst_addr(node_id_priv), this);
 509
 510                 parent = *new;
 511                 if (result < 0)
 512                         new = &((*new)->rb_left);
 513                 else if (result > 0)
 514                         new = &((*new)->rb_right);
 515                 else {
 516                         list_add_tail(&node_id_priv->id_list_entry,
 517                                       &this->id_list);
 518                         kfree(node);
 519                         goto unlock;
 520                 }
 521         }
 522
 523         INIT_LIST_HEAD(&node->id_list);
 524         list_add_tail(&node_id_priv->id_list_entry, &node->id_list);
 525
 526         rb_link_node(&node->rb_node, parent, new);
 527         rb_insert_color(&node->rb_node, &id_table);
 528
 529 unlock:
 530         spin_unlock_irqrestore(&id_table_lock, flags);
 531         return 0;
 532 }
 533
 534 static struct id_table_entry *
 535 node_from_ndev_ip(struct rb_root *root, int ifindex, struct sockaddr *sa)
 536 {
 537         struct rb_node *node = root->rb_node;
 538         struct id_table_entry *data;
 539         int result;
 540
 541         while (node) {
 542                 data = container_of(node, struct id_table_entry, rb_node);
 543                 result = compare_netdev_and_ip(ifindex, sa, data);
 544                 if (result < 0)
 545                         node = node->rb_left;
 546                 else if (result > 0)
 547                         node = node->rb_right;
 548                 else
 549                         return data;
 550         }
 551
 552         return NULL;
 553 }
 554
 555 static void cma_remove_id_from_tree(struct rdma_id_private *id_priv)
 556 {
 557         struct id_table_entry *data;
 558         unsigned long flags;
 559
 560         spin_lock_irqsave(&id_table_lock, flags);
 561         if (list_empty(&id_priv->id_list_entry))
 562                 goto out;
 563
 564         data = node_from_ndev_ip(&id_table,
 565                                  id_priv->id.route.addr.dev_addr.bound_dev_if,
 566                                  cma_dst_addr(id_priv));
 567         if (!data)
 568                 goto out;
 569
 570         list_del_init(&id_priv->id_list_entry);
 571         if (list_empty(&data->id_list)) {
 572                 rb_erase(&data->rb_node, &id_table);
 573                 kfree(data);
 574         }
 575 out:
 576         spin_unlock_irqrestore(&id_table_lock, flags);
 577 }
 578
 579 static void _cma_attach_to_dev(struct rdma_id_private *id_priv,
 580                                struct cma_device *cma_dev)
 581 {
 582         cma_dev_get(cma_dev);
 583         id_priv->cma_dev = cma_dev;
 584         id_priv->id.device = cma_dev->device;
 585         id_priv->id.route.addr.dev_addr.transport =
 586                 rdma_node_get_transport(cma_dev->device->node_type);
 587         list_add_tail(&id_priv->device_item, &cma_dev->id_list);
 588
 589         trace_cm_id_attach(id_priv, cma_dev->device);
 590 }
 591
 592 static void cma_attach_to_dev(struct rdma_id_private *id_priv,
 593                               struct cma_device *cma_dev)
 594 {
 595         _cma_attach_to_dev(id_priv, cma_dev);
 596         id_priv->gid_type =
 597                 cma_dev->default_gid_type[id_priv->id.port_num -
 598                                           rdma_start_port(cma_dev->device)];
 599 }
 600
 601 static void cma_release_dev(struct rdma_id_private *id_priv)
 602 {
 603         mutex_lock(&lock);
 604         list_del_init(&id_priv->device_item);
 605         cma_dev_put(id_priv->cma_dev);
 606         id_priv->cma_dev = NULL;
 607         id_priv->id.device = NULL;
 608         if (id_priv->id.route.addr.dev_addr.sgid_attr) {
 609                 rdma_put_gid_attr(id_priv->id.route.addr.dev_addr.sgid_attr);
 610                 id_priv->id.route.addr.dev_addr.sgid_attr = NULL;
 611         }
 612         mutex_unlock(&lock);
 613 }
 614
 615 static inline unsigned short cma_family(struct rdma_id_private *id_priv)
 616 {
 617         return id_priv->id.route.addr.src_addr.ss_family;
 618 }
 619
 620 static int cma_set_qkey(struct rdma_id_private *id_priv, u32 qkey)
 621 {
 622         struct ib_sa_mcmember_rec rec;
 623         int ret = 0;
 624
 625         if (id_priv->qkey) {
 626                 if (qkey && id_priv->qkey != qkey)
 627                         return -EINVAL;
 628                 return 0;
 629         }
 630
 631         if (qkey) {
 632                 id_priv->qkey = qkey;
 633                 return 0;
 634         }
 635
 636         switch (id_priv->id.ps) {
 637         case RDMA_PS_UDP:
 638         case RDMA_PS_IB:
 639                 id_priv->qkey = RDMA_UDP_QKEY;
 640                 break;
 641         case RDMA_PS_IPOIB:
 642                 ib_addr_get_mgid(&id_priv->id.route.addr.dev_addr, &rec.mgid);
 643                 ret = ib_sa_get_mcmember_rec(id_priv->id.device,
 644                                              id_priv->id.port_num, &rec.mgid,
 645                                              &rec);
 646                 if (!ret)
 647                         id_priv->qkey = be32_to_cpu(rec.qkey);
 648                 break;
 649         default:
 650                 break;
 651         }
 652         return ret;
 653 }
 654
 655 static void cma_translate_ib(struct sockaddr_ib *sib, struct rdma_dev_addr *dev_addr)
 656 {
 657         dev_addr->dev_type = ARPHRD_INFINIBAND;
 658         rdma_addr_set_sgid(dev_addr, (union ib_gid *) &sib->sib_addr);
 659         ib_addr_set_pkey(dev_addr, ntohs(sib->sib_pkey));
 660 }
 661
 662 static int cma_translate_addr(struct sockaddr *addr, struct rdma_dev_addr *dev_addr)
 663 {
 664         int ret;
 665
 666         if (addr->sa_family != AF_IB) {
 667                 ret = rdma_translate_ip(addr, dev_addr);
 668         } else {
 669                 cma_translate_ib((struct sockaddr_ib *) addr, dev_addr);
 670                 ret = 0;
 671         }
 672
 673         return ret;
 674 }
 675
 676 static const struct ib_gid_attr *
 677 cma_validate_port(struct ib_device *device, u32 port,
 678                   enum ib_gid_type gid_type,
 679                   union ib_gid *gid,
 680                   struct rdma_id_private *id_priv)
 681 {
 682         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
 683         int bound_if_index = dev_addr->bound_dev_if;
 684         const struct ib_gid_attr *sgid_attr;
 685         int dev_type = dev_addr->dev_type;
 686         struct net_device *ndev = NULL;
 687
 688         if (!rdma_dev_access_netns(device, id_priv->id.route.addr.dev_addr.net))
 689                 return ERR_PTR(-ENODEV);
 690
 691         if ((dev_type == ARPHRD_INFINIBAND) && !rdma_protocol_ib(device, port))
 692                 return ERR_PTR(-ENODEV);
 693
 694         if ((dev_type != ARPHRD_INFINIBAND) && rdma_protocol_ib(device, port))
 695                 return ERR_PTR(-ENODEV);
 696
 697         if (dev_type == ARPHRD_ETHER && rdma_protocol_roce(device, port)) {
 698                 ndev = dev_get_by_index(dev_addr->net, bound_if_index);
 699                 if (!ndev)
 700                         return ERR_PTR(-ENODEV);
 701         } else {
 702                 gid_type = IB_GID_TYPE_IB;
 703         }
 704
 705         sgid_attr = rdma_find_gid_by_port(device, gid, gid_type, port, ndev);
 706         if (ndev)
 707                 dev_put(ndev);
 708         return sgid_attr;
 709 }
 710
 711 static void cma_bind_sgid_attr(struct rdma_id_private *id_priv,
 712                                const struct ib_gid_attr *sgid_attr)
 713 {
 714         WARN_ON(id_priv->id.route.addr.dev_addr.sgid_attr);
 715         id_priv->id.route.addr.dev_addr.sgid_attr = sgid_attr;
 716 }
 717
 718 /**
 719  * cma_acquire_dev_by_src_ip - Acquire cma device, port, gid attribute
 720  * based on source ip address.
 721  * @id_priv:    cm_id which should be bound to cma device
 722  *
 723  * cma_acquire_dev_by_src_ip() binds cm id to cma device, port and GID attribute
 724  * based on source IP address. It returns 0 on success or error code otherwise.
 725  * It is applicable to active and passive side cm_id.
 726  */
 727 static int cma_acquire_dev_by_src_ip(struct rdma_id_private *id_priv)
 728 {
 729         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
 730         const struct ib_gid_attr *sgid_attr;
 731         union ib_gid gid, iboe_gid, *gidp;
 732         struct cma_device *cma_dev;
 733         enum ib_gid_type gid_type;
 734         int ret = -ENODEV;
 735         u32 port;
 736
 737         if (dev_addr->dev_type != ARPHRD_INFINIBAND &&
 738             id_priv->id.ps == RDMA_PS_IPOIB)
 739                 return -EINVAL;
 740
 741         rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
 742                     &iboe_gid);
 743
 744         memcpy(&gid, dev_addr->src_dev_addr +
 745                rdma_addr_gid_offset(dev_addr), sizeof(gid));
 746
 747         mutex_lock(&lock);
 748         list_for_each_entry(cma_dev, &dev_list, list) {
 749                 rdma_for_each_port (cma_dev->device, port) {
 750                         gidp = rdma_protocol_roce(cma_dev->device, port) ?
 751                                &iboe_gid : &gid;
 752                         gid_type = cma_dev->default_gid_type[port - 1];
 753                         sgid_attr = cma_validate_port(cma_dev->device, port,
 754                                                       gid_type, gidp, id_priv);
 755                         if (!IS_ERR(sgid_attr)) {
 756                                 id_priv->id.port_num = port;
 757                                 cma_bind_sgid_attr(id_priv, sgid_attr);
 758                                 cma_attach_to_dev(id_priv, cma_dev);
 759                                 ret = 0;
 760                                 goto out;
 761                         }
 762                 }
 763         }
 764 out:
 765         mutex_unlock(&lock);
 766         return ret;
 767 }
 768
 769 /**
 770  * cma_ib_acquire_dev - Acquire cma device, port and SGID attribute
 771  * @id_priv:            cm id to bind to cma device
 772  * @listen_id_priv:     listener cm id to match against
 773  * @req:                Pointer to req structure containaining incoming
 774  *                      request information
 775  * cma_ib_acquire_dev() acquires cma device, port and SGID attribute when
 776  * rdma device matches for listen_id and incoming request. It also verifies
 777  * that a GID table entry is present for the source address.
 778  * Returns 0 on success, or returns error code otherwise.
 779  */
 780 static int cma_ib_acquire_dev(struct rdma_id_private *id_priv,
 781                               const struct rdma_id_private *listen_id_priv,
 782                               struct cma_req_info *req)
 783 {
 784         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
 785         const struct ib_gid_attr *sgid_attr;
 786         enum ib_gid_type gid_type;
 787         union ib_gid gid;
 788
 789         if (dev_addr->dev_type != ARPHRD_INFINIBAND &&
 790             id_priv->id.ps == RDMA_PS_IPOIB)
 791                 return -EINVAL;
 792
 793         if (rdma_protocol_roce(req->device, req->port))
 794                 rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
 795                             &gid);
 796         else
 797                 memcpy(&gid, dev_addr->src_dev_addr +
 798                        rdma_addr_gid_offset(dev_addr), sizeof(gid));
 799
 800         gid_type = listen_id_priv->cma_dev->default_gid_type[req->port - 1];
 801         sgid_attr = cma_validate_port(req->device, req->port,
 802                                       gid_type, &gid, id_priv);
 803         if (IS_ERR(sgid_attr))
 804                 return PTR_ERR(sgid_attr);
 805
 806         id_priv->id.port_num = req->port;
 807         cma_bind_sgid_attr(id_priv, sgid_attr);
 808         /* Need to acquire lock to protect against reader
 809          * of cma_dev->id_list such as cma_netdev_callback() and
 810          * cma_process_remove().
 811          */
 812         mutex_lock(&lock);
 813         cma_attach_to_dev(id_priv, listen_id_priv->cma_dev);
 814         mutex_unlock(&lock);
 815         rdma_restrack_add(&id_priv->res);
 816         return 0;
 817 }
 818
 819 static int cma_iw_acquire_dev(struct rdma_id_private *id_priv,
 820                               const struct rdma_id_private *listen_id_priv)
 821 {
 822         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
 823         const struct ib_gid_attr *sgid_attr;
 824         struct cma_device *cma_dev;
 825         enum ib_gid_type gid_type;
 826         int ret = -ENODEV;
 827         union ib_gid gid;
 828         u32 port;
 829
 830         if (dev_addr->dev_type != ARPHRD_INFINIBAND &&
 831             id_priv->id.ps == RDMA_PS_IPOIB)
 832                 return -EINVAL;
 833
 834         memcpy(&gid, dev_addr->src_dev_addr +
 835                rdma_addr_gid_offset(dev_addr), sizeof(gid));
 836
 837         mutex_lock(&lock);
 838
 839         cma_dev = listen_id_priv->cma_dev;
 840         port = listen_id_priv->id.port_num;
 841         gid_type = listen_id_priv->gid_type;
 842         sgid_attr = cma_validate_port(cma_dev->device, port,
 843                                       gid_type, &gid, id_priv);
 844         if (!IS_ERR(sgid_attr)) {
 845                 id_priv->id.port_num = port;
 846                 cma_bind_sgid_attr(id_priv, sgid_attr);
 847                 ret = 0;
 848                 goto out;
 849         }
 850
 851         list_for_each_entry(cma_dev, &dev_list, list) {
 852                 rdma_for_each_port (cma_dev->device, port) {
 853                         if (listen_id_priv->cma_dev == cma_dev &&
 854                             listen_id_priv->id.port_num == port)
 855                                 continue;
 856
 857                         gid_type = cma_dev->default_gid_type[port - 1];
 858                         sgid_attr = cma_validate_port(cma_dev->device, port,
 859                                                       gid_type, &gid, id_priv);
 860                         if (!IS_ERR(sgid_attr)) {
 861                                 id_priv->id.port_num = port;
 862                                 cma_bind_sgid_attr(id_priv, sgid_attr);
 863                                 ret = 0;
 864                                 goto out;
 865                         }
 866                 }
 867         }
 868
 869 out:
 870         if (!ret) {
 871                 cma_attach_to_dev(id_priv, cma_dev);
 872                 rdma_restrack_add(&id_priv->res);
 873         }
 874
 875         mutex_unlock(&lock);
 876         return ret;
 877 }
 878
 879 /*
 880  * Select the source IB device and address to reach the destination IB address.
 881  */
 882 static int cma_resolve_ib_dev(struct rdma_id_private *id_priv)
 883 {
 884         struct cma_device *cma_dev, *cur_dev;
 885         struct sockaddr_ib *addr;
 886         union ib_gid gid, sgid, *dgid;
 887         unsigned int p;
 888         u16 pkey, index;
 889         enum ib_port_state port_state;
 890         int ret;
 891         int i;
 892
 893         cma_dev = NULL;
 894         addr = (struct sockaddr_ib *) cma_dst_addr(id_priv);
 895         dgid = (union ib_gid *) &addr->sib_addr;
 896         pkey = ntohs(addr->sib_pkey);
 897
 898         mutex_lock(&lock);
 899         list_for_each_entry(cur_dev, &dev_list, list) {
 900                 rdma_for_each_port (cur_dev->device, p) {
 901                         if (!rdma_cap_af_ib(cur_dev->device, p))
 902                                 continue;
 903
 904                         if (ib_find_cached_pkey(cur_dev->device, p, pkey, &index))
 905                                 continue;
 906
 907                         if (ib_get_cached_port_state(cur_dev->device, p, &port_state))
 908                                 continue;
 909
 910                         for (i = 0; i < cur_dev->device->port_data[p].immutable.gid_tbl_len;
 911                              ++i) {
 912                                 ret = rdma_query_gid(cur_dev->device, p, i,
 913                                                      &gid);
 914                                 if (ret)
 915                                         continue;
 916
 917                                 if (!memcmp(&gid, dgid, sizeof(gid))) {
 918                                         cma_dev = cur_dev;
 919                                         sgid = gid;
 920                                         id_priv->id.port_num = p;
 921                                         goto found;
 922                                 }
 923
 924                                 if (!cma_dev && (gid.global.subnet_prefix ==
 925                                     dgid->global.subnet_prefix) &&
 926                                     port_state == IB_PORT_ACTIVE) {
 927                                         cma_dev = cur_dev;
 928                                         sgid = gid;
 929                                         id_priv->id.port_num = p;
 930                                         goto found;
 931                                 }
 932                         }
 933                 }
 934         }
 935         mutex_unlock(&lock);
 936         return -ENODEV;
 937
 938 found:
 939         cma_attach_to_dev(id_priv, cma_dev);
 940         rdma_restrack_add(&id_priv->res);
 941         mutex_unlock(&lock);
 942         addr = (struct sockaddr_ib *)cma_src_addr(id_priv);
 943         memcpy(&addr->sib_addr, &sgid, sizeof(sgid));
 944         cma_translate_ib(addr, &id_priv->id.route.addr.dev_addr);
 945         return 0;
 946 }
 947
 948 static void cma_id_get(struct rdma_id_private *id_priv)
 949 {
 950         refcount_inc(&id_priv->refcount);
 951 }
 952
 953 static void cma_id_put(struct rdma_id_private *id_priv)
 954 {
 955         if (refcount_dec_and_test(&id_priv->refcount))
 956                 complete(&id_priv->comp);
 957 }
 958
 959 static struct rdma_id_private *
 960 __rdma_create_id(struct net *net, rdma_cm_event_handler event_handler,
 961                  void *context, enum rdma_ucm_port_space ps,
 962                  enum ib_qp_type qp_type, const struct rdma_id_private *parent)
 963 {
 964         struct rdma_id_private *id_priv;
 965
 966         id_priv = kzalloc(sizeof *id_priv, GFP_KERNEL);
 967         if (!id_priv)
 968                 return ERR_PTR(-ENOMEM);
 969
 970         id_priv->state = RDMA_CM_IDLE;
 971         id_priv->id.context = context;
 972         id_priv->id.event_handler = event_handler;
 973         id_priv->id.ps = ps;
 974         id_priv->id.qp_type = qp_type;
 975         id_priv->tos_set = false;
 976         id_priv->timeout_set = false;
 977         id_priv->min_rnr_timer_set = false;
 978         id_priv->gid_type = IB_GID_TYPE_IB;
 979         spin_lock_init(&id_priv->lock);
 980         mutex_init(&id_priv->qp_mutex);
 981         init_completion(&id_priv->comp);
 982         refcount_set(&id_priv->refcount, 1);
 983         mutex_init(&id_priv->handler_mutex);
 984         INIT_LIST_HEAD(&id_priv->device_item);
 985         INIT_LIST_HEAD(&id_priv->id_list_entry);
 986         INIT_LIST_HEAD(&id_priv->listen_list);
 987         INIT_LIST_HEAD(&id_priv->mc_list);
 988         get_random_bytes(&id_priv->seq_num, sizeof id_priv->seq_num);
 989         id_priv->id.route.addr.dev_addr.net = get_net(net);
 990         id_priv->seq_num &= 0x00ffffff;
 991
 992         rdma_restrack_new(&id_priv->res, RDMA_RESTRACK_CM_ID);
 993         if (parent)
 994                 rdma_restrack_parent_name(&id_priv->res, &parent->res);
 995
 996         return id_priv;
 997 }
 998
 999 struct rdma_cm_id *
1000 __rdma_create_kernel_id(struct net *net, rdma_cm_event_handler event_handler,
1001                         void *context, enum rdma_ucm_port_space ps,
1002                         enum ib_qp_type qp_type, const char *caller)
1003 {
1004         struct rdma_id_private *ret;
1005
1006         ret = __rdma_create_id(net, event_handler, context, ps, qp_type, NULL);
1007         if (IS_ERR(ret))
1008                 return ERR_CAST(ret);
1009
1010         rdma_restrack_set_name(&ret->res, caller);
1011         return &ret->id;
1012 }
1013 EXPORT_SYMBOL(__rdma_create_kernel_id);
1014
1015 struct rdma_cm_id *rdma_create_user_id(rdma_cm_event_handler event_handler,
1016                                        void *context,
1017                                        enum rdma_ucm_port_space ps,
1018                                        enum ib_qp_type qp_type)
1019 {
1020         struct rdma_id_private *ret;
1021
1022         ret = __rdma_create_id(current->nsproxy->net_ns, event_handler, context,
1023                                ps, qp_type, NULL);
1024         if (IS_ERR(ret))
1025                 return ERR_CAST(ret);
1026
1027         rdma_restrack_set_name(&ret->res, NULL);
1028         return &ret->id;
1029 }
1030 EXPORT_SYMBOL(rdma_create_user_id);
1031
1032 static int cma_init_ud_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
1033 {
1034         struct ib_qp_attr qp_attr;
1035         int qp_attr_mask, ret;
1036
1037         qp_attr.qp_state = IB_QPS_INIT;
1038         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
1039         if (ret)
1040                 return ret;
1041
1042         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
1043         if (ret)
1044                 return ret;
1045
1046         qp_attr.qp_state = IB_QPS_RTR;
1047         ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
1048         if (ret)
1049                 return ret;
1050
1051         qp_attr.qp_state = IB_QPS_RTS;
1052         qp_attr.sq_psn = 0;
1053         ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE | IB_QP_SQ_PSN);
1054
1055         return ret;
1056 }
1057
1058 static int cma_init_conn_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
1059 {
1060         struct ib_qp_attr qp_attr;
1061         int qp_attr_mask, ret;
1062
1063         qp_attr.qp_state = IB_QPS_INIT;
1064         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
1065         if (ret)
1066                 return ret;
1067
1068         return ib_modify_qp(qp, &qp_attr, qp_attr_mask);
1069 }
1070
1071 int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
1072                    struct ib_qp_init_attr *qp_init_attr)
1073 {
1074         struct rdma_id_private *id_priv;
1075         struct ib_qp *qp;
1076         int ret;
1077
1078         id_priv = container_of(id, struct rdma_id_private, id);
1079         if (id->device != pd->device) {
1080                 ret = -EINVAL;
1081                 goto out_err;
1082         }
1083
1084         qp_init_attr->port_num = id->port_num;
1085         qp = ib_create_qp(pd, qp_init_attr);
1086         if (IS_ERR(qp)) {
1087                 ret = PTR_ERR(qp);
1088                 goto out_err;
1089         }
1090
1091         if (id->qp_type == IB_QPT_UD)
1092                 ret = cma_init_ud_qp(id_priv, qp);
1093         else
1094                 ret = cma_init_conn_qp(id_priv, qp);
1095         if (ret)
1096                 goto out_destroy;
1097
1098         id->qp = qp;
1099         id_priv->qp_num = qp->qp_num;
1100         id_priv->srq = (qp->srq != NULL);
1101         trace_cm_qp_create(id_priv, pd, qp_init_attr, 0);
1102         return 0;
1103 out_destroy:
1104         ib_destroy_qp(qp);
1105 out_err:
1106         trace_cm_qp_create(id_priv, pd, qp_init_attr, ret);
1107         return ret;
1108 }
1109 EXPORT_SYMBOL(rdma_create_qp);
1110
1111 void rdma_destroy_qp(struct rdma_cm_id *id)
1112 {
1113         struct rdma_id_private *id_priv;
1114
1115         id_priv = container_of(id, struct rdma_id_private, id);
1116         trace_cm_qp_destroy(id_priv);
1117         mutex_lock(&id_priv->qp_mutex);
1118         ib_destroy_qp(id_priv->id.qp);
1119         id_priv->id.qp = NULL;
1120         mutex_unlock(&id_priv->qp_mutex);
1121 }
1122 EXPORT_SYMBOL(rdma_destroy_qp);
1123
1124 static int cma_modify_qp_rtr(struct rdma_id_private *id_priv,
1125                              struct rdma_conn_param *conn_param)
1126 {
1127         struct ib_qp_attr qp_attr;
1128         int qp_attr_mask, ret;
1129
1130         mutex_lock(&id_priv->qp_mutex);
1131         if (!id_priv->id.qp) {
1132                 ret = 0;
1133                 goto out;
1134         }
1135
1136         /* Need to update QP attributes from default values. */
1137         qp_attr.qp_state = IB_QPS_INIT;
1138         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
1139         if (ret)
1140                 goto out;
1141
1142         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
1143         if (ret)
1144                 goto out;
1145
1146         qp_attr.qp_state = IB_QPS_RTR;
1147         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
1148         if (ret)
1149                 goto out;
1150
1151         BUG_ON(id_priv->cma_dev->device != id_priv->id.device);
1152
1153         if (conn_param)
1154                 qp_attr.max_dest_rd_atomic = conn_param->responder_resources;
1155         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
1156 out:
1157         mutex_unlock(&id_priv->qp_mutex);
1158         return ret;
1159 }
1160
1161 static int cma_modify_qp_rts(struct rdma_id_private *id_priv,
1162                              struct rdma_conn_param *conn_param)
1163 {
1164         struct ib_qp_attr qp_attr;
1165         int qp_attr_mask, ret;
1166
1167         mutex_lock(&id_priv->qp_mutex);
1168         if (!id_priv->id.qp) {
1169                 ret = 0;
1170                 goto out;
1171         }
1172
1173         qp_attr.qp_state = IB_QPS_RTS;
1174         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
1175         if (ret)
1176                 goto out;
1177
1178         if (conn_param)
1179                 qp_attr.max_rd_atomic = conn_param->initiator_depth;
1180         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
1181 out:
1182         mutex_unlock(&id_priv->qp_mutex);
1183         return ret;
1184 }
1185
1186 static int cma_modify_qp_err(struct rdma_id_private *id_priv)
1187 {
1188         struct ib_qp_attr qp_attr;
1189         int ret;
1190
1191         mutex_lock(&id_priv->qp_mutex);
1192         if (!id_priv->id.qp) {
1193                 ret = 0;
1194                 goto out;
1195         }
1196
1197         qp_attr.qp_state = IB_QPS_ERR;
1198         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, IB_QP_STATE);
1199 out:
1200         mutex_unlock(&id_priv->qp_mutex);
1201         return ret;
1202 }
1203
1204 static int cma_ib_init_qp_attr(struct rdma_id_private *id_priv,
1205                                struct ib_qp_attr *qp_attr, int *qp_attr_mask)
1206 {
1207         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
1208         int ret;
1209         u16 pkey;
1210
1211         if (rdma_cap_eth_ah(id_priv->id.device, id_priv->id.port_num))
1212                 pkey = 0xffff;
1213         else
1214                 pkey = ib_addr_get_pkey(dev_addr);
1215
1216         ret = ib_find_cached_pkey(id_priv->id.device, id_priv->id.port_num,
1217                                   pkey, &qp_attr->pkey_index);
1218         if (ret)
1219                 return ret;
1220
1221         qp_attr->port_num = id_priv->id.port_num;
1222         *qp_attr_mask = IB_QP_STATE | IB_QP_PKEY_INDEX | IB_QP_PORT;
1223
1224         if (id_priv->id.qp_type == IB_QPT_UD) {
1225                 ret = cma_set_qkey(id_priv, 0);
1226                 if (ret)
1227                         return ret;
1228
1229                 qp_attr->qkey = id_priv->qkey;
1230                 *qp_attr_mask |= IB_QP_QKEY;
1231         } else {
1232                 qp_attr->qp_access_flags = 0;
1233                 *qp_attr_mask |= IB_QP_ACCESS_FLAGS;
1234         }
1235         return 0;
1236 }
1237
1238 int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
1239                        int *qp_attr_mask)
1240 {
1241         struct rdma_id_private *id_priv;
1242         int ret = 0;
1243
1244         id_priv = container_of(id, struct rdma_id_private, id);
1245         if (rdma_cap_ib_cm(id->device, id->port_num)) {
1246                 if (!id_priv->cm_id.ib || (id_priv->id.qp_type == IB_QPT_UD))
1247                         ret = cma_ib_init_qp_attr(id_priv, qp_attr, qp_attr_mask);
1248                 else
1249                         ret = ib_cm_init_qp_attr(id_priv->cm_id.ib, qp_attr,
1250                                                  qp_attr_mask);
1251
1252                 if (qp_attr->qp_state == IB_QPS_RTR)
1253                         qp_attr->rq_psn = id_priv->seq_num;
1254         } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
1255                 if (!id_priv->cm_id.iw) {
1256                         qp_attr->qp_access_flags = 0;
1257                         *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS;
1258                 } else
1259                         ret = iw_cm_init_qp_attr(id_priv->cm_id.iw, qp_attr,
1260                                                  qp_attr_mask);
1261                 qp_attr->port_num = id_priv->id.port_num;
1262                 *qp_attr_mask |= IB_QP_PORT;
1263         } else {
1264                 ret = -ENOSYS;
1265         }
1266
1267         if ((*qp_attr_mask & IB_QP_TIMEOUT) && id_priv->timeout_set)
1268                 qp_attr->timeout = id_priv->timeout;
1269
1270         if ((*qp_attr_mask & IB_QP_MIN_RNR_TIMER) && id_priv->min_rnr_timer_set)
1271                 qp_attr->min_rnr_timer = id_priv->min_rnr_timer;
1272
1273         return ret;
1274 }
1275 EXPORT_SYMBOL(rdma_init_qp_attr);
1276
1277 static inline bool cma_zero_addr(const struct sockaddr *addr)
1278 {
1279         switch (addr->sa_family) {
1280         case AF_INET:
1281                 return ipv4_is_zeronet(((struct sockaddr_in *)addr)->sin_addr.s_addr);
1282         case AF_INET6:
1283                 return ipv6_addr_any(&((struct sockaddr_in6 *)addr)->sin6_addr);
1284         case AF_IB:
1285                 return ib_addr_any(&((struct sockaddr_ib *)addr)->sib_addr);
1286         default:
1287                 return false;
1288         }
1289 }
1290
1291 static inline bool cma_loopback_addr(const struct sockaddr *addr)
1292 {
1293         switch (addr->sa_family) {
1294         case AF_INET:
1295                 return ipv4_is_loopback(
1296                         ((struct sockaddr_in *)addr)->sin_addr.s_addr);
1297         case AF_INET6:
1298                 return ipv6_addr_loopback(
1299                         &((struct sockaddr_in6 *)addr)->sin6_addr);
1300         case AF_IB:
1301                 return ib_addr_loopback(
1302                         &((struct sockaddr_ib *)addr)->sib_addr);
1303         default:
1304                 return false;
1305         }
1306 }
1307
1308 static inline bool cma_any_addr(const struct sockaddr *addr)
1309 {
1310         return cma_zero_addr(addr) || cma_loopback_addr(addr);
1311 }
1312
1313 static int cma_addr_cmp(const struct sockaddr *src, const struct sockaddr *dst)
1314 {
1315         if (src->sa_family != dst->sa_family)
1316                 return -1;
1317
1318         switch (src->sa_family) {
1319         case AF_INET:
1320                 return ((struct sockaddr_in *)src)->sin_addr.s_addr !=
1321                        ((struct sockaddr_in *)dst)->sin_addr.s_addr;
1322         case AF_INET6: {
1323                 struct sockaddr_in6 *src_addr6 = (struct sockaddr_in6 *)src;
1324                 struct sockaddr_in6 *dst_addr6 = (struct sockaddr_in6 *)dst;
1325                 bool link_local;
1326
1327                 if (ipv6_addr_cmp(&src_addr6->sin6_addr,
1328                                           &dst_addr6->sin6_addr))
1329                         return 1;
1330                 link_local = ipv6_addr_type(&dst_addr6->sin6_addr) &
1331                              IPV6_ADDR_LINKLOCAL;
1332                 /* Link local must match their scope_ids */
1333                 return link_local ? (src_addr6->sin6_scope_id !=
1334                                      dst_addr6->sin6_scope_id) :
1335                                     0;
1336         }
1337
1338         default:
1339                 return ib_addr_cmp(&((struct sockaddr_ib *) src)->sib_addr,
1340                                    &((struct sockaddr_ib *) dst)->sib_addr);
1341         }
1342 }
1343
1344 static __be16 cma_port(const struct sockaddr *addr)
1345 {
1346         struct sockaddr_ib *sib;
1347
1348         switch (addr->sa_family) {
1349         case AF_INET:
1350                 return ((struct sockaddr_in *) addr)->sin_port;
1351         case AF_INET6:
1352                 return ((struct sockaddr_in6 *) addr)->sin6_port;
1353         case AF_IB:
1354                 sib = (struct sockaddr_ib *) addr;
1355                 return htons((u16) (be64_to_cpu(sib->sib_sid) &
1356                                     be64_to_cpu(sib->sib_sid_mask)));
1357         default:
1358                 return 0;
1359         }
1360 }
1361
1362 static inline int cma_any_port(const struct sockaddr *addr)
1363 {
1364         return !cma_port(addr);
1365 }
1366
1367 static void cma_save_ib_info(struct sockaddr *src_addr,
1368                              struct sockaddr *dst_addr,
1369                              const struct rdma_cm_id *listen_id,
1370                              const struct sa_path_rec *path)
1371 {
1372         struct sockaddr_ib *listen_ib, *ib;
1373
1374         listen_ib = (struct sockaddr_ib *) &listen_id->route.addr.src_addr;
1375         if (src_addr) {
1376                 ib = (struct sockaddr_ib *)src_addr;
1377                 ib->sib_family = AF_IB;
1378                 if (path) {
1379                         ib->sib_pkey = path->pkey;
1380                         ib->sib_flowinfo = path->flow_label;
1381                         memcpy(&ib->sib_addr, &path->sgid, 16);
1382                         ib->sib_sid = path->service_id;
1383                         ib->sib_scope_id = 0;
1384                 } else {
1385                         ib->sib_pkey = listen_ib->sib_pkey;
1386                         ib->sib_flowinfo = listen_ib->sib_flowinfo;
1387                         ib->sib_addr = listen_ib->sib_addr;
1388                         ib->sib_sid = listen_ib->sib_sid;
1389                         ib->sib_scope_id = listen_ib->sib_scope_id;
1390                 }
1391                 ib->sib_sid_mask = cpu_to_be64(0xffffffffffffffffULL);
1392         }
1393         if (dst_addr) {
1394                 ib = (struct sockaddr_ib *)dst_addr;
1395                 ib->sib_family = AF_IB;
1396                 if (path) {
1397                         ib->sib_pkey = path->pkey;
1398                         ib->sib_flowinfo = path->flow_label;
1399                         memcpy(&ib->sib_addr, &path->dgid, 16);
1400                 }
1401         }
1402 }
1403
1404 static void cma_save_ip4_info(struct sockaddr_in *src_addr,
1405                               struct sockaddr_in *dst_addr,
1406                               struct cma_hdr *hdr,
1407                               __be16 local_port)
1408 {
1409         if (src_addr) {
1410                 *src_addr = (struct sockaddr_in) {
1411                         .sin_family = AF_INET,
1412                         .sin_addr.s_addr = hdr->dst_addr.ip4.addr,
1413                         .sin_port = local_port,
1414                 };
1415         }
1416
1417         if (dst_addr) {
1418                 *dst_addr = (struct sockaddr_in) {
1419                         .sin_family = AF_INET,
1420                         .sin_addr.s_addr = hdr->src_addr.ip4.addr,
1421                         .sin_port = hdr->port,
1422                 };
1423         }
1424 }
1425
1426 static void cma_save_ip6_info(struct sockaddr_in6 *src_addr,
1427                               struct sockaddr_in6 *dst_addr,
1428                               struct cma_hdr *hdr,
1429                               __be16 local_port)
1430 {
1431         if (src_addr) {
1432                 *src_addr = (struct sockaddr_in6) {
1433                         .sin6_family = AF_INET6,
1434                         .sin6_addr = hdr->dst_addr.ip6,
1435                         .sin6_port = local_port,
1436                 };
1437         }
1438
1439         if (dst_addr) {
1440                 *dst_addr = (struct sockaddr_in6) {
1441                         .sin6_family = AF_INET6,
1442                         .sin6_addr = hdr->src_addr.ip6,
1443                         .sin6_port = hdr->port,
1444                 };
1445         }
1446 }
1447
1448 static u16 cma_port_from_service_id(__be64 service_id)
1449 {
1450         return (u16)be64_to_cpu(service_id);
1451 }
1452
1453 static int cma_save_ip_info(struct sockaddr *src_addr,
1454                             struct sockaddr *dst_addr,
1455                             const struct ib_cm_event *ib_event,
1456                             __be64 service_id)
1457 {
1458         struct cma_hdr *hdr;
1459         __be16 port;
1460
1461         hdr = ib_event->private_data;
1462         if (hdr->cma_version != CMA_VERSION)
1463                 return -EINVAL;
1464
1465         port = htons(cma_port_from_service_id(service_id));
1466
1467         switch (cma_get_ip_ver(hdr)) {
1468         case 4:
1469                 cma_save_ip4_info((struct sockaddr_in *)src_addr,
1470                                   (struct sockaddr_in *)dst_addr, hdr, port);
1471                 break;
1472         case 6:
1473                 cma_save_ip6_info((struct sockaddr_in6 *)src_addr,
1474                                   (struct sockaddr_in6 *)dst_addr, hdr, port);
1475                 break;
1476         default:
1477                 return -EAFNOSUPPORT;
1478         }
1479
1480         return 0;
1481 }
1482
1483 static int cma_save_net_info(struct sockaddr *src_addr,
1484                              struct sockaddr *dst_addr,
1485                              const struct rdma_cm_id *listen_id,
1486                              const struct ib_cm_event *ib_event,
1487                              sa_family_t sa_family, __be64 service_id)
1488 {
1489         if (sa_family == AF_IB) {
1490                 if (ib_event->event == IB_CM_REQ_RECEIVED)
1491                         cma_save_ib_info(src_addr, dst_addr, listen_id,
1492                                          ib_event->param.req_rcvd.primary_path);
1493                 else if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED)
1494                         cma_save_ib_info(src_addr, dst_addr, listen_id, NULL);
1495                 return 0;
1496         }
1497
1498         return cma_save_ip_info(src_addr, dst_addr, ib_event, service_id);
1499 }
1500
1501 static int cma_save_req_info(const struct ib_cm_event *ib_event,
1502                              struct cma_req_info *req)
1503 {
1504         const struct ib_cm_req_event_param *req_param =
1505                 &ib_event->param.req_rcvd;
1506         const struct ib_cm_sidr_req_event_param *sidr_param =
1507                 &ib_event->param.sidr_req_rcvd;
1508
1509         switch (ib_event->event) {
1510         case IB_CM_REQ_RECEIVED:
1511                 req->device     = req_param->listen_id->device;
1512                 req->port       = req_param->port;
1513                 memcpy(&req->local_gid, &req_param->primary_path->sgid,
1514                        sizeof(req->local_gid));
1515                 req->has_gid    = true;
1516                 req->service_id = req_param->primary_path->service_id;
1517                 req->pkey       = be16_to_cpu(req_param->primary_path->pkey);
1518                 if (req->pkey != req_param->bth_pkey)
1519                         pr_warn_ratelimited("RDMA CMA: got different BTH P_Key (0x%x) and primary path P_Key (0x%x)\n"
1520                                             "RDMA CMA: in the future this may cause the request to be dropped\n",
1521                                             req_param->bth_pkey, req->pkey);
1522                 break;
1523         case IB_CM_SIDR_REQ_RECEIVED:
1524                 req->device     = sidr_param->listen_id->device;
1525                 req->port       = sidr_param->port;
1526                 req->has_gid    = false;
1527                 req->service_id = sidr_param->service_id;
1528                 req->pkey       = sidr_param->pkey;
1529                 if (req->pkey != sidr_param->bth_pkey)
1530                         pr_warn_ratelimited("RDMA CMA: got different BTH P_Key (0x%x) and SIDR request payload P_Key (0x%x)\n"
1531                                             "RDMA CMA: in the future this may cause the request to be dropped\n",
1532                                             sidr_param->bth_pkey, req->pkey);
1533                 break;
1534         default:
1535                 return -EINVAL;
1536         }
1537
1538         return 0;
1539 }
1540
1541 static bool validate_ipv4_net_dev(struct net_device *net_dev,
1542                                   const struct sockaddr_in *dst_addr,
1543                                   const struct sockaddr_in *src_addr)
1544 {
1545         __be32 daddr = dst_addr->sin_addr.s_addr,
1546                saddr = src_addr->sin_addr.s_addr;
1547         struct fib_result res;
1548         struct flowi4 fl4;
1549         int err;
1550         bool ret;
1551
1552         if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) ||
1553             ipv4_is_lbcast(daddr) || ipv4_is_zeronet(saddr) ||
1554             ipv4_is_zeronet(daddr) || ipv4_is_loopback(daddr) ||
1555             ipv4_is_loopback(saddr))
1556                 return false;
1557
1558         memset(&fl4, 0, sizeof(fl4));
1559         fl4.flowi4_oif = net_dev->ifindex;
1560         fl4.daddr = daddr;
1561         fl4.saddr = saddr;
1562
1563         rcu_read_lock();
1564         err = fib_lookup(dev_net(net_dev), &fl4, &res, 0);
1565         ret = err == 0 && FIB_RES_DEV(res) == net_dev;
1566         rcu_read_unlock();
1567
1568         return ret;
1569 }
1570
1571 static bool validate_ipv6_net_dev(struct net_device *net_dev,
1572                                   const struct sockaddr_in6 *dst_addr,
1573                                   const struct sockaddr_in6 *src_addr)
1574 {
1575 #if IS_ENABLED(CONFIG_IPV6)
1576         const int strict = ipv6_addr_type(&dst_addr->sin6_addr) &
1577                            IPV6_ADDR_LINKLOCAL;
1578         struct rt6_info *rt = rt6_lookup(dev_net(net_dev), &dst_addr->sin6_addr,
1579                                          &src_addr->sin6_addr, net_dev->ifindex,
1580                                          NULL, strict);
1581         bool ret;
1582
1583         if (!rt)
1584                 return false;
1585
1586         ret = rt->rt6i_idev->dev == net_dev;
1587         ip6_rt_put(rt);
1588
1589         return ret;
1590 #else
1591         return false;
1592 #endif
1593 }
1594
1595 static bool validate_net_dev(struct net_device *net_dev,
1596                              const struct sockaddr *daddr,
1597                              const struct sockaddr *saddr)
1598 {
1599         const struct sockaddr_in *daddr4 = (const struct sockaddr_in *)daddr;
1600         const struct sockaddr_in *saddr4 = (const struct sockaddr_in *)saddr;
1601         const struct sockaddr_in6 *daddr6 = (const struct sockaddr_in6 *)daddr;
1602         const struct sockaddr_in6 *saddr6 = (const struct sockaddr_in6 *)saddr;
1603
1604         switch (daddr->sa_family) {
1605         case AF_INET:
1606                 return saddr->sa_family == AF_INET &&
1607                        validate_ipv4_net_dev(net_dev, daddr4, saddr4);
1608
1609         case AF_INET6:
1610                 return saddr->sa_family == AF_INET6 &&
1611                        validate_ipv6_net_dev(net_dev, daddr6, saddr6);
1612
1613         default:
1614                 return false;
1615         }
1616 }
1617
1618 static struct net_device *
1619 roce_get_net_dev_by_cm_event(const struct ib_cm_event *ib_event)
1620 {
1621         const struct ib_gid_attr *sgid_attr = NULL;
1622         struct net_device *ndev;
1623
1624         if (ib_event->event == IB_CM_REQ_RECEIVED)
1625                 sgid_attr = ib_event->param.req_rcvd.ppath_sgid_attr;
1626         else if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED)
1627                 sgid_attr = ib_event->param.sidr_req_rcvd.sgid_attr;
1628
1629         if (!sgid_attr)
1630                 return NULL;
1631
1632         rcu_read_lock();
1633         ndev = rdma_read_gid_attr_ndev_rcu(sgid_attr);
1634         if (IS_ERR(ndev))
1635                 ndev = NULL;
1636         else
1637                 dev_hold(ndev);
1638         rcu_read_unlock();
1639         return ndev;
1640 }
1641
1642 static struct net_device *cma_get_net_dev(const struct ib_cm_event *ib_event,
1643                                           struct cma_req_info *req)
1644 {
1645         struct sockaddr *listen_addr =
1646                         (struct sockaddr *)&req->listen_addr_storage;
1647         struct sockaddr *src_addr = (struct sockaddr *)&req->src_addr_storage;
1648         struct net_device *net_dev;
1649         const union ib_gid *gid = req->has_gid ? &req->local_gid : NULL;
1650         int err;
1651
1652         err = cma_save_ip_info(listen_addr, src_addr, ib_event,
1653                                req->service_id);
1654         if (err)
1655                 return ERR_PTR(err);
1656
1657         if (rdma_protocol_roce(req->device, req->port))
1658                 net_dev = roce_get_net_dev_by_cm_event(ib_event);
1659         else
1660                 net_dev = ib_get_net_dev_by_params(req->device, req->port,
1661                                                    req->pkey,
1662                                                    gid, listen_addr);
1663         if (!net_dev)
1664                 return ERR_PTR(-ENODEV);
1665
1666         return net_dev;
1667 }
1668
1669 static enum rdma_ucm_port_space rdma_ps_from_service_id(__be64 service_id)
1670 {
1671         return (be64_to_cpu(service_id) >> 16) & 0xffff;
1672 }
1673
1674 static bool cma_match_private_data(struct rdma_id_private *id_priv,
1675                                    const struct cma_hdr *hdr)
1676 {
1677         struct sockaddr *addr = cma_src_addr(id_priv);
1678         __be32 ip4_addr;
1679         struct in6_addr ip6_addr;
1680
1681         if (cma_any_addr(addr) && !id_priv->afonly)
1682                 return true;
1683
1684         switch (addr->sa_family) {
1685         case AF_INET:
1686                 ip4_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
1687                 if (cma_get_ip_ver(hdr) != 4)
1688                         return false;
1689                 if (!cma_any_addr(addr) &&
1690                     hdr->dst_addr.ip4.addr != ip4_addr)
1691                         return false;
1692                 break;
1693         case AF_INET6:
1694                 ip6_addr = ((struct sockaddr_in6 *)addr)->sin6_addr;
1695                 if (cma_get_ip_ver(hdr) != 6)
1696                         return false;
1697                 if (!cma_any_addr(addr) &&
1698                     memcmp(&hdr->dst_addr.ip6, &ip6_addr, sizeof(ip6_addr)))
1699                         return false;
1700                 break;
1701         case AF_IB:
1702                 return true;
1703         default:
1704                 return false;
1705         }
1706
1707         return true;
1708 }
1709
1710 static bool cma_protocol_roce(const struct rdma_cm_id *id)
1711 {
1712         struct ib_device *device = id->device;
1713         const u32 port_num = id->port_num ?: rdma_start_port(device);
1714
1715         return rdma_protocol_roce(device, port_num);
1716 }
1717
1718 static bool cma_is_req_ipv6_ll(const struct cma_req_info *req)
1719 {
1720         const struct sockaddr *daddr =
1721                         (const struct sockaddr *)&req->listen_addr_storage;
1722         const struct sockaddr_in6 *daddr6 = (const struct sockaddr_in6 *)daddr;
1723
1724         /* Returns true if the req is for IPv6 link local */
1725         return (daddr->sa_family == AF_INET6 &&
1726                 (ipv6_addr_type(&daddr6->sin6_addr) & IPV6_ADDR_LINKLOCAL));
1727 }
1728
1729 static bool cma_match_net_dev(const struct rdma_cm_id *id,
1730                               const struct net_device *net_dev,
1731                               const struct cma_req_info *req)
1732 {
1733         const struct rdma_addr *addr = &id->route.addr;
1734
1735         if (!net_dev)
1736                 /* This request is an AF_IB request */
1737                 return (!id->port_num || id->port_num == req->port) &&
1738                        (addr->src_addr.ss_family == AF_IB);
1739
1740         /*
1741          * If the request is not for IPv6 link local, allow matching
1742          * request to any netdevice of the one or multiport rdma device.
1743          */
1744         if (!cma_is_req_ipv6_ll(req))
1745                 return true;
1746         /*
1747          * Net namespaces must match, and if the listner is listening
1748          * on a specific netdevice than netdevice must match as well.
1749          */
1750         if (net_eq(dev_net(net_dev), addr->dev_addr.net) &&
1751             (!!addr->dev_addr.bound_dev_if ==
1752              (addr->dev_addr.bound_dev_if == net_dev->ifindex)))
1753                 return true;
1754         else
1755                 return false;
1756 }
1757
1758 static struct rdma_id_private *cma_find_listener(
1759                 const struct rdma_bind_list *bind_list,
1760                 const struct ib_cm_id *cm_id,
1761                 const struct ib_cm_event *ib_event,
1762                 const struct cma_req_info *req,
1763                 const struct net_device *net_dev)
1764 {
1765         struct rdma_id_private *id_priv, *id_priv_dev;
1766
1767         lockdep_assert_held(&lock);
1768
1769         if (!bind_list)
1770                 return ERR_PTR(-EINVAL);
1771
1772         hlist_for_each_entry(id_priv, &bind_list->owners, node) {
1773                 if (cma_match_private_data(id_priv, ib_event->private_data)) {
1774                         if (id_priv->id.device == cm_id->device &&
1775                             cma_match_net_dev(&id_priv->id, net_dev, req))
1776                                 return id_priv;
1777                         list_for_each_entry(id_priv_dev,
1778                                             &id_priv->listen_list,
1779                                             listen_item) {
1780                                 if (id_priv_dev->id.device == cm_id->device &&
1781                                     cma_match_net_dev(&id_priv_dev->id,
1782                                                       net_dev, req))
1783                                         return id_priv_dev;
1784                         }
1785                 }
1786         }
1787
1788         return ERR_PTR(-EINVAL);
1789 }
1790
1791 static struct rdma_id_private *
1792 cma_ib_id_from_event(struct ib_cm_id *cm_id,
1793                      const struct ib_cm_event *ib_event,
1794                      struct cma_req_info *req,
1795                      struct net_device **net_dev)
1796 {
1797         struct rdma_bind_list *bind_list;
1798         struct rdma_id_private *id_priv;
1799         int err;
1800
1801         err = cma_save_req_info(ib_event, req);
1802         if (err)
1803                 return ERR_PTR(err);
1804
1805         *net_dev = cma_get_net_dev(ib_event, req);
1806         if (IS_ERR(*net_dev)) {
1807                 if (PTR_ERR(*net_dev) == -EAFNOSUPPORT) {
1808                         /* Assuming the protocol is AF_IB */
1809                         *net_dev = NULL;
1810                 } else {
1811                         return ERR_CAST(*net_dev);
1812                 }
1813         }
1814
1815         mutex_lock(&lock);
1816         /*
1817          * Net namespace might be getting deleted while route lookup,
1818          * cm_id lookup is in progress. Therefore, perform netdevice
1819          * validation, cm_id lookup under rcu lock.
1820          * RCU lock along with netdevice state check, synchronizes with
1821          * netdevice migrating to different net namespace and also avoids
1822          * case where net namespace doesn't get deleted while lookup is in
1823          * progress.
1824          * If the device state is not IFF_UP, its properties such as ifindex
1825          * and nd_net cannot be trusted to remain valid without rcu lock.
1826          * net/core/dev.c change_net_namespace() ensures to synchronize with
1827          * ongoing operations on net device after device is closed using
1828          * synchronize_net().
1829          */
1830         rcu_read_lock();
1831         if (*net_dev) {
1832                 /*
1833                  * If netdevice is down, it is likely that it is administratively
1834                  * down or it might be migrating to different namespace.
1835                  * In that case avoid further processing, as the net namespace
1836                  * or ifindex may change.
1837                  */
1838                 if (((*net_dev)->flags & IFF_UP) == 0) {
1839                         id_priv = ERR_PTR(-EHOSTUNREACH);
1840                         goto err;
1841                 }
1842
1843                 if (!validate_net_dev(*net_dev,
1844                                  (struct sockaddr *)&req->src_addr_storage,
1845                                  (struct sockaddr *)&req->listen_addr_storage)) {
1846                         id_priv = ERR_PTR(-EHOSTUNREACH);
1847                         goto err;
1848                 }
1849         }
1850
1851         bind_list = cma_ps_find(*net_dev ? dev_net(*net_dev) : &init_net,
1852                                 rdma_ps_from_service_id(req->service_id),
1853                                 cma_port_from_service_id(req->service_id));
1854         id_priv = cma_find_listener(bind_list, cm_id, ib_event, req, *net_dev);
1855 err:
1856         rcu_read_unlock();
1857         mutex_unlock(&lock);
1858         if (IS_ERR(id_priv) && *net_dev) {
1859                 dev_put(*net_dev);
1860                 *net_dev = NULL;
1861         }
1862         return id_priv;
1863 }
1864
1865 static inline u8 cma_user_data_offset(struct rdma_id_private *id_priv)
1866 {
1867         return cma_family(id_priv) == AF_IB ? 0 : sizeof(struct cma_hdr);
1868 }
1869
1870 static void cma_cancel_route(struct rdma_id_private *id_priv)
1871 {
1872         if (rdma_cap_ib_sa(id_priv->id.device, id_priv->id.port_num)) {
1873                 if (id_priv->query)
1874                         ib_sa_cancel_query(id_priv->query_id, id_priv->query);
1875         }
1876 }
1877
1878 static void _cma_cancel_listens(struct rdma_id_private *id_priv)
1879 {
1880         struct rdma_id_private *dev_id_priv;
1881
1882         lockdep_assert_held(&lock);
1883
1884         /*
1885          * Remove from listen_any_list to prevent added devices from spawning
1886          * additional listen requests.
1887          */
1888         list_del_init(&id_priv->listen_any_item);
1889
1890         while (!list_empty(&id_priv->listen_list)) {
1891                 dev_id_priv =
1892                         list_first_entry(&id_priv->listen_list,
1893                                          struct rdma_id_private, listen_item);
1894                 /* sync with device removal to avoid duplicate destruction */
1895                 list_del_init(&dev_id_priv->device_item);
1896                 list_del_init(&dev_id_priv->listen_item);
1897                 mutex_unlock(&lock);
1898
1899                 rdma_destroy_id(&dev_id_priv->id);
1900                 mutex_lock(&lock);
1901         }
1902 }
1903
1904 static void cma_cancel_listens(struct rdma_id_private *id_priv)
1905 {
1906         mutex_lock(&lock);
1907         _cma_cancel_listens(id_priv);
1908         mutex_unlock(&lock);
1909 }
1910
1911 static void cma_cancel_operation(struct rdma_id_private *id_priv,
1912                                  enum rdma_cm_state state)
1913 {
1914         switch (state) {
1915         case RDMA_CM_ADDR_QUERY:
1916                 /*
1917                  * We can avoid doing the rdma_addr_cancel() based on state,
1918                  * only RDMA_CM_ADDR_QUERY has a work that could still execute.
1919                  * Notice that the addr_handler work could still be exiting
1920                  * outside this state, however due to the interaction with the
1921                  * handler_mutex the work is guaranteed not to touch id_priv
1922                  * during exit.
1923                  */
1924                 rdma_addr_cancel(&id_priv->id.route.addr.dev_addr);
1925                 break;
1926         case RDMA_CM_ROUTE_QUERY:
1927                 cma_cancel_route(id_priv);
1928                 break;
1929         case RDMA_CM_LISTEN:
1930                 if (cma_any_addr(cma_src_addr(id_priv)) && !id_priv->cma_dev)
1931                         cma_cancel_listens(id_priv);
1932                 break;
1933         default:
1934                 break;
1935         }
1936 }
1937
1938 static void cma_release_port(struct rdma_id_private *id_priv)
1939 {
1940         struct rdma_bind_list *bind_list = id_priv->bind_list;
1941         struct net *net = id_priv->id.route.addr.dev_addr.net;
1942
1943         if (!bind_list)
1944                 return;
1945
1946         mutex_lock(&lock);
1947         hlist_del(&id_priv->node);
1948         if (hlist_empty(&bind_list->owners)) {
1949                 cma_ps_remove(net, bind_list->ps, bind_list->port);
1950                 kfree(bind_list);
1951         }
1952         mutex_unlock(&lock);
1953 }
1954
1955 static void destroy_mc(struct rdma_id_private *id_priv,
1956                        struct cma_multicast *mc)
1957 {
1958         bool send_only = mc->join_state == BIT(SENDONLY_FULLMEMBER_JOIN);
1959
1960         if (rdma_cap_ib_mcast(id_priv->id.device, id_priv->id.port_num))
1961                 ib_sa_free_multicast(mc->sa_mc);
1962
1963         if (rdma_protocol_roce(id_priv->id.device, id_priv->id.port_num)) {
1964                 struct rdma_dev_addr *dev_addr =
1965                         &id_priv->id.route.addr.dev_addr;
1966                 struct net_device *ndev = NULL;
1967
1968                 if (dev_addr->bound_dev_if)
1969                         ndev = dev_get_by_index(dev_addr->net,
1970                                                 dev_addr->bound_dev_if);
1971                 if (ndev && !send_only) {
1972                         enum ib_gid_type gid_type;
1973                         union ib_gid mgid;
1974
1975                         gid_type = id_priv->cma_dev->default_gid_type
1976                                            [id_priv->id.port_num -
1977                                             rdma_start_port(
1978                                                     id_priv->cma_dev->device)];
1979                         cma_iboe_set_mgid((struct sockaddr *)&mc->addr, &mgid,
1980                                           gid_type);
1981                         cma_igmp_send(ndev, &mgid, false);
1982                 }
1983                 dev_put(ndev);
1984
1985                 cancel_work_sync(&mc->iboe_join.work);
1986         }
1987         kfree(mc);
1988 }
1989
1990 static void cma_leave_mc_groups(struct rdma_id_private *id_priv)
1991 {
1992         struct cma_multicast *mc;
1993
1994         while (!list_empty(&id_priv->mc_list)) {
1995                 mc = list_first_entry(&id_priv->mc_list, struct cma_multicast,
1996                                       list);
1997                 list_del(&mc->list);
1998                 destroy_mc(id_priv, mc);
1999         }
2000 }
2001
2002 static void _destroy_id(struct rdma_id_private *id_priv,
2003                         enum rdma_cm_state state)
2004 {
2005         cma_cancel_operation(id_priv, state);
2006
2007         rdma_restrack_del(&id_priv->res);
2008         cma_remove_id_from_tree(id_priv);
2009         if (id_priv->cma_dev) {
2010                 if (rdma_cap_ib_cm(id_priv->id.device, 1)) {
2011                         if (id_priv->cm_id.ib)
2012                                 ib_destroy_cm_id(id_priv->cm_id.ib);
2013                 } else if (rdma_cap_iw_cm(id_priv->id.device, 1)) {
2014                         if (id_priv->cm_id.iw)
2015                                 iw_destroy_cm_id(id_priv->cm_id.iw);
2016                 }
2017                 cma_leave_mc_groups(id_priv);
2018                 cma_release_dev(id_priv);
2019         }
2020
2021         cma_release_port(id_priv);
2022         cma_id_put(id_priv);
2023         wait_for_completion(&id_priv->comp);
2024
2025         if (id_priv->internal_id)
2026                 cma_id_put(id_priv->id.context);
2027
2028         kfree(id_priv->id.route.path_rec);
2029         kfree(id_priv->id.route.path_rec_inbound);
2030         kfree(id_priv->id.route.path_rec_outbound);
2031
2032         put_net(id_priv->id.route.addr.dev_addr.net);
2033         kfree(id_priv);
2034 }
2035
2036 /*
2037  * destroy an ID from within the handler_mutex. This ensures that no other
2038  * handlers can start running concurrently.
2039  */
2040 static void destroy_id_handler_unlock(struct rdma_id_private *id_priv)
2041         __releases(&idprv->handler_mutex)
2042 {
2043         enum rdma_cm_state state;
2044         unsigned long flags;
2045
2046         trace_cm_id_destroy(id_priv);
2047
2048         /*
2049          * Setting the state to destroyed under the handler mutex provides a
2050          * fence against calling handler callbacks. If this is invoked due to
2051          * the failure of a handler callback then it guarentees that no future
2052          * handlers will be called.
2053          */
2054         lockdep_assert_held(&id_priv->handler_mutex);
2055         spin_lock_irqsave(&id_priv->lock, flags);
2056         state = id_priv->state;
2057         id_priv->state = RDMA_CM_DESTROYING;
2058         spin_unlock_irqrestore(&id_priv->lock, flags);
2059         mutex_unlock(&id_priv->handler_mutex);
2060         _destroy_id(id_priv, state);
2061 }
2062
2063 void rdma_destroy_id(struct rdma_cm_id *id)
2064 {
2065         struct rdma_id_private *id_priv =
2066                 container_of(id, struct rdma_id_private, id);
2067
2068         mutex_lock(&id_priv->handler_mutex);
2069         destroy_id_handler_unlock(id_priv);
2070 }
2071 EXPORT_SYMBOL(rdma_destroy_id);
2072
2073 static int cma_rep_recv(struct rdma_id_private *id_priv)
2074 {
2075         int ret;
2076
2077         ret = cma_modify_qp_rtr(id_priv, NULL);
2078         if (ret)
2079                 goto reject;
2080
2081         ret = cma_modify_qp_rts(id_priv, NULL);
2082         if (ret)
2083                 goto reject;
2084
2085         trace_cm_send_rtu(id_priv);
2086         ret = ib_send_cm_rtu(id_priv->cm_id.ib, NULL, 0);
2087         if (ret)
2088                 goto reject;
2089
2090         return 0;
2091 reject:
2092         pr_debug_ratelimited("RDMA CM: CONNECT_ERROR: failed to handle reply. status %d\n", ret);
2093         cma_modify_qp_err(id_priv);
2094         trace_cm_send_rej(id_priv);
2095         ib_send_cm_rej(id_priv->cm_id.ib, IB_CM_REJ_CONSUMER_DEFINED,
2096                        NULL, 0, NULL, 0);
2097         return ret;
2098 }
2099
2100 static void cma_set_rep_event_data(struct rdma_cm_event *event,
2101                                    const struct ib_cm_rep_event_param *rep_data,
2102                                    void *private_data)
2103 {
2104         event->param.conn.private_data = private_data;
2105         event->param.conn.private_data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
2106         event->param.conn.responder_resources = rep_data->responder_resources;
2107         event->param.conn.initiator_depth = rep_data->initiator_depth;
2108         event->param.conn.flow_control = rep_data->flow_control;
2109         event->param.conn.rnr_retry_count = rep_data->rnr_retry_count;
2110         event->param.conn.srq = rep_data->srq;
2111         event->param.conn.qp_num = rep_data->remote_qpn;
2112
2113         event->ece.vendor_id = rep_data->ece.vendor_id;
2114         event->ece.attr_mod = rep_data->ece.attr_mod;
2115 }
2116
2117 static int cma_cm_event_handler(struct rdma_id_private *id_priv,
2118                                 struct rdma_cm_event *event)
2119 {
2120         int ret;
2121
2122         lockdep_assert_held(&id_priv->handler_mutex);
2123
2124         trace_cm_event_handler(id_priv, event);
2125         ret = id_priv->id.event_handler(&id_priv->id, event);
2126         trace_cm_event_done(id_priv, event, ret);
2127         return ret;
2128 }
2129
2130 static int cma_ib_handler(struct ib_cm_id *cm_id,
2131                           const struct ib_cm_event *ib_event)
2132 {
2133         struct rdma_id_private *id_priv = cm_id->context;
2134         struct rdma_cm_event event = {};
2135         enum rdma_cm_state state;
2136         int ret;
2137
2138         mutex_lock(&id_priv->handler_mutex);
2139         state = READ_ONCE(id_priv->state);
2140         if ((ib_event->event != IB_CM_TIMEWAIT_EXIT &&
2141              state != RDMA_CM_CONNECT) ||
2142             (ib_event->event == IB_CM_TIMEWAIT_EXIT &&
2143              state != RDMA_CM_DISCONNECT))
2144                 goto out;
2145
2146         switch (ib_event->event) {
2147         case IB_CM_REQ_ERROR:
2148         case IB_CM_REP_ERROR:
2149                 event.event = RDMA_CM_EVENT_UNREACHABLE;
2150                 event.status = -ETIMEDOUT;
2151                 break;
2152         case IB_CM_REP_RECEIVED:
2153                 if (state == RDMA_CM_CONNECT &&
2154                     (id_priv->id.qp_type != IB_QPT_UD)) {
2155                         trace_cm_send_mra(id_priv);
2156                         ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
2157                 }
2158                 if (id_priv->id.qp) {
2159                         event.status = cma_rep_recv(id_priv);
2160                         event.event = event.status ? RDMA_CM_EVENT_CONNECT_ERROR :
2161                                                      RDMA_CM_EVENT_ESTABLISHED;
2162                 } else {
2163                         event.event = RDMA_CM_EVENT_CONNECT_RESPONSE;
2164                 }
2165                 cma_set_rep_event_data(&event, &ib_event->param.rep_rcvd,
2166                                        ib_event->private_data);
2167                 break;
2168         case IB_CM_RTU_RECEIVED:
2169         case IB_CM_USER_ESTABLISHED:
2170                 event.event = RDMA_CM_EVENT_ESTABLISHED;
2171                 break;
2172         case IB_CM_DREQ_ERROR:
2173                 event.status = -ETIMEDOUT;
2174                 fallthrough;
2175         case IB_CM_DREQ_RECEIVED:
2176         case IB_CM_DREP_RECEIVED:
2177                 if (!cma_comp_exch(id_priv, RDMA_CM_CONNECT,
2178                                    RDMA_CM_DISCONNECT))
2179                         goto out;
2180                 event.event = RDMA_CM_EVENT_DISCONNECTED;
2181                 break;
2182         case IB_CM_TIMEWAIT_EXIT:
2183                 event.event = RDMA_CM_EVENT_TIMEWAIT_EXIT;
2184                 break;
2185         case IB_CM_MRA_RECEIVED:
2186                 /* ignore event */
2187                 goto out;
2188         case IB_CM_REJ_RECEIVED:
2189                 pr_debug_ratelimited("RDMA CM: REJECTED: %s\n", rdma_reject_msg(&id_priv->id,
2190                                                                                 ib_event->param.rej_rcvd.reason));
2191                 cma_modify_qp_err(id_priv);
2192                 event.status = ib_event->param.rej_rcvd.reason;
2193                 event.event = RDMA_CM_EVENT_REJECTED;
2194                 event.param.conn.private_data = ib_event->private_data;
2195                 event.param.conn.private_data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
2196                 break;
2197         default:
2198                 pr_err("RDMA CMA: unexpected IB CM event: %d\n",
2199                        ib_event->event);
2200                 goto out;
2201         }
2202
2203         ret = cma_cm_event_handler(id_priv, &event);
2204         if (ret) {
2205                 /* Destroy the CM ID by returning a non-zero value. */
2206                 id_priv->cm_id.ib = NULL;
2207                 destroy_id_handler_unlock(id_priv);
2208                 return ret;
2209         }
2210 out:
2211         mutex_unlock(&id_priv->handler_mutex);
2212         return 0;
2213 }
2214
2215 static struct rdma_id_private *
2216 cma_ib_new_conn_id(const struct rdma_cm_id *listen_id,
2217                    const struct ib_cm_event *ib_event,
2218                    struct net_device *net_dev)
2219 {
2220         struct rdma_id_private *listen_id_priv;
2221         struct rdma_id_private *id_priv;
2222         struct rdma_cm_id *id;
2223         struct rdma_route *rt;
2224         const sa_family_t ss_family = listen_id->route.addr.src_addr.ss_family;
2225         struct sa_path_rec *path = ib_event->param.req_rcvd.primary_path;
2226         const __be64 service_id =
2227                 ib_event->param.req_rcvd.primary_path->service_id;
2228         int ret;
2229
2230         listen_id_priv = container_of(listen_id, struct rdma_id_private, id);
2231         id_priv = __rdma_create_id(listen_id->route.addr.dev_addr.net,
2232                                    listen_id->event_handler, listen_id->context,
2233                                    listen_id->ps,
2234                                    ib_event->param.req_rcvd.qp_type,
2235                                    listen_id_priv);
2236         if (IS_ERR(id_priv))
2237                 return NULL;
2238
2239         id = &id_priv->id;
2240         if (cma_save_net_info((struct sockaddr *)&id->route.addr.src_addr,
2241                               (struct sockaddr *)&id->route.addr.dst_addr,
2242                               listen_id, ib_event, ss_family, service_id))
2243                 goto err;
2244
2245         rt = &id->route;
2246         rt->num_pri_alt_paths = ib_event->param.req_rcvd.alternate_path ? 2 : 1;
2247         rt->path_rec = kmalloc_array(rt->num_pri_alt_paths,
2248                                      sizeof(*rt->path_rec), GFP_KERNEL);
2249         if (!rt->path_rec)
2250                 goto err;
2251
2252         rt->path_rec[0] = *path;
2253         if (rt->num_pri_alt_paths == 2)
2254                 rt->path_rec[1] = *ib_event->param.req_rcvd.alternate_path;
2255
2256         if (net_dev) {
2257                 rdma_copy_src_l2_addr(&rt->addr.dev_addr, net_dev);
2258         } else {
2259                 if (!cma_protocol_roce(listen_id) &&
2260                     cma_any_addr(cma_src_addr(id_priv))) {
2261                         rt->addr.dev_addr.dev_type = ARPHRD_INFINIBAND;
2262                         rdma_addr_set_sgid(&rt->addr.dev_addr, &rt->path_rec[0].sgid);
2263                         ib_addr_set_pkey(&rt->addr.dev_addr, be16_to_cpu(rt->path_rec[0].pkey));
2264                 } else if (!cma_any_addr(cma_src_addr(id_priv))) {
2265                         ret = cma_translate_addr(cma_src_addr(id_priv), &rt->addr.dev_addr);
2266                         if (ret)
2267                                 goto err;
2268                 }
2269         }
2270         rdma_addr_set_dgid(&rt->addr.dev_addr, &rt->path_rec[0].dgid);
2271
2272         id_priv->state = RDMA_CM_CONNECT;
2273         return id_priv;
2274
2275 err:
2276         rdma_destroy_id(id);
2277         return NULL;
2278 }
2279
2280 static struct rdma_id_private *
2281 cma_ib_new_udp_id(const struct rdma_cm_id *listen_id,
2282                   const struct ib_cm_event *ib_event,
2283                   struct net_device *net_dev)
2284 {
2285         const struct rdma_id_private *listen_id_priv;
2286         struct rdma_id_private *id_priv;
2287         struct rdma_cm_id *id;
2288         const sa_family_t ss_family = listen_id->route.addr.src_addr.ss_family;
2289         struct net *net = listen_id->route.addr.dev_addr.net;
2290         int ret;
2291
2292         listen_id_priv = container_of(listen_id, struct rdma_id_private, id);
2293         id_priv = __rdma_create_id(net, listen_id->event_handler,
2294                                    listen_id->context, listen_id->ps, IB_QPT_UD,
2295                                    listen_id_priv);
2296         if (IS_ERR(id_priv))
2297                 return NULL;
2298
2299         id = &id_priv->id;
2300         if (cma_save_net_info((struct sockaddr *)&id->route.addr.src_addr,
2301                               (struct sockaddr *)&id->route.addr.dst_addr,
2302                               listen_id, ib_event, ss_family,
2303                               ib_event->param.sidr_req_rcvd.service_id))
2304                 goto err;
2305
2306         if (net_dev) {
2307                 rdma_copy_src_l2_addr(&id->route.addr.dev_addr, net_dev);
2308         } else {
2309                 if (!cma_any_addr(cma_src_addr(id_priv))) {
2310                         ret = cma_translate_addr(cma_src_addr(id_priv),
2311                                                  &id->route.addr.dev_addr);
2312                         if (ret)
2313                                 goto err;
2314                 }
2315         }
2316
2317         id_priv->state = RDMA_CM_CONNECT;
2318         return id_priv;
2319 err:
2320         rdma_destroy_id(id);
2321         return NULL;
2322 }
2323
2324 static void cma_set_req_event_data(struct rdma_cm_event *event,
2325                                    const struct ib_cm_req_event_param *req_data,
2326                                    void *private_data, int offset)
2327 {
2328         event->param.conn.private_data = private_data + offset;
2329         event->param.conn.private_data_len = IB_CM_REQ_PRIVATE_DATA_SIZE - offset;
2330         event->param.conn.responder_resources = req_data->responder_resources;
2331         event->param.conn.initiator_depth = req_data->initiator_depth;
2332         event->param.conn.flow_control = req_data->flow_control;
2333         event->param.conn.retry_count = req_data->retry_count;
2334         event->param.conn.rnr_retry_count = req_data->rnr_retry_count;
2335         event->param.conn.srq = req_data->srq;
2336         event->param.conn.qp_num = req_data->remote_qpn;
2337
2338         event->ece.vendor_id = req_data->ece.vendor_id;
2339         event->ece.attr_mod = req_data->ece.attr_mod;
2340 }
2341
2342 static int cma_ib_check_req_qp_type(const struct rdma_cm_id *id,
2343                                     const struct ib_cm_event *ib_event)
2344 {
2345         return (((ib_event->event == IB_CM_REQ_RECEIVED) &&
2346                  (ib_event->param.req_rcvd.qp_type == id->qp_type)) ||
2347                 ((ib_event->event == IB_CM_SIDR_REQ_RECEIVED) &&
2348                  (id->qp_type == IB_QPT_UD)) ||
2349                 (!id->qp_type));
2350 }
2351
2352 static int cma_ib_req_handler(struct ib_cm_id *cm_id,
2353                               const struct ib_cm_event *ib_event)
2354 {
2355         struct rdma_id_private *listen_id, *conn_id = NULL;
2356         struct rdma_cm_event event = {};
2357         struct cma_req_info req = {};
2358         struct net_device *net_dev;
2359         u8 offset;
2360         int ret;
2361
2362         listen_id = cma_ib_id_from_event(cm_id, ib_event, &req, &net_dev);
2363         if (IS_ERR(listen_id))
2364                 return PTR_ERR(listen_id);
2365
2366         trace_cm_req_handler(listen_id, ib_event->event);
2367         if (!cma_ib_check_req_qp_type(&listen_id->id, ib_event)) {
2368                 ret = -EINVAL;
2369                 goto net_dev_put;
2370         }
2371
2372         mutex_lock(&listen_id->handler_mutex);
2373         if (READ_ONCE(listen_id->state) != RDMA_CM_LISTEN) {
2374                 ret = -ECONNABORTED;
2375                 goto err_unlock;
2376         }
2377
2378         offset = cma_user_data_offset(listen_id);
2379         event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
2380         if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED) {
2381                 conn_id = cma_ib_new_udp_id(&listen_id->id, ib_event, net_dev);
2382                 event.param.ud.private_data = ib_event->private_data + offset;
2383                 event.param.ud.private_data_len =
2384                                 IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE - offset;
2385         } else {
2386                 conn_id = cma_ib_new_conn_id(&listen_id->id, ib_event, net_dev);
2387                 cma_set_req_event_data(&event, &ib_event->param.req_rcvd,
2388                                        ib_event->private_data, offset);
2389         }
2390         if (!conn_id) {
2391                 ret = -ENOMEM;
2392                 goto err_unlock;
2393         }
2394
2395         mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
2396         ret = cma_ib_acquire_dev(conn_id, listen_id, &req);
2397         if (ret) {
2398                 destroy_id_handler_unlock(conn_id);
2399                 goto err_unlock;
2400         }
2401
2402         conn_id->cm_id.ib = cm_id;
2403         cm_id->context = conn_id;
2404         cm_id->cm_handler = cma_ib_handler;
2405
2406         ret = cma_cm_event_handler(conn_id, &event);
2407         if (ret) {
2408                 /* Destroy the CM ID by returning a non-zero value. */
2409                 conn_id->cm_id.ib = NULL;
2410                 mutex_unlock(&listen_id->handler_mutex);
2411                 destroy_id_handler_unlock(conn_id);
2412                 goto net_dev_put;
2413         }
2414
2415         if (READ_ONCE(conn_id->state) == RDMA_CM_CONNECT &&
2416             conn_id->id.qp_type != IB_QPT_UD) {
2417                 trace_cm_send_mra(cm_id->context);
2418                 ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
2419         }
2420         mutex_unlock(&conn_id->handler_mutex);
2421
2422 err_unlock:
2423         mutex_unlock(&listen_id->handler_mutex);
2424
2425 net_dev_put:
2426         if (net_dev)
2427                 dev_put(net_dev);
2428
2429         return ret;
2430 }
2431
2432 __be64 rdma_get_service_id(struct rdma_cm_id *id, struct sockaddr *addr)
2433 {
2434         if (addr->sa_family == AF_IB)
2435                 return ((struct sockaddr_ib *) addr)->sib_sid;
2436
2437         return cpu_to_be64(((u64)id->ps << 16) + be16_to_cpu(cma_port(addr)));
2438 }
2439 EXPORT_SYMBOL(rdma_get_service_id);
2440
2441 void rdma_read_gids(struct rdma_cm_id *cm_id, union ib_gid *sgid,
2442                     union ib_gid *dgid)
2443 {
2444         struct rdma_addr *addr = &cm_id->route.addr;
2445
2446         if (!cm_id->device) {
2447                 if (sgid)
2448                         memset(sgid, 0, sizeof(*sgid));
2449                 if (dgid)
2450                         memset(dgid, 0, sizeof(*dgid));
2451                 return;
2452         }
2453
2454         if (rdma_protocol_roce(cm_id->device, cm_id->port_num)) {
2455                 if (sgid)
2456                         rdma_ip2gid((struct sockaddr *)&addr->src_addr, sgid);
2457                 if (dgid)
2458                         rdma_ip2gid((struct sockaddr *)&addr->dst_addr, dgid);
2459         } else {
2460                 if (sgid)
2461                         rdma_addr_get_sgid(&addr->dev_addr, sgid);
2462                 if (dgid)
2463                         rdma_addr_get_dgid(&addr->dev_addr, dgid);
2464         }
2465 }
2466 EXPORT_SYMBOL(rdma_read_gids);
2467
2468 static int cma_iw_handler(struct iw_cm_id *iw_id, struct iw_cm_event *iw_event)
2469 {
2470         struct rdma_id_private *id_priv = iw_id->context;
2471         struct rdma_cm_event event = {};
2472         int ret = 0;
2473         struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr;
2474         struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr;
2475
2476         mutex_lock(&id_priv->handler_mutex);
2477         if (READ_ONCE(id_priv->state) != RDMA_CM_CONNECT)
2478                 goto out;
2479
2480         switch (iw_event->event) {
2481         case IW_CM_EVENT_CLOSE:
2482                 event.event = RDMA_CM_EVENT_DISCONNECTED;
2483                 break;
2484         case IW_CM_EVENT_CONNECT_REPLY:
2485                 memcpy(cma_src_addr(id_priv), laddr,
2486                        rdma_addr_size(laddr));
2487                 memcpy(cma_dst_addr(id_priv), raddr,
2488                        rdma_addr_size(raddr));
2489                 switch (iw_event->status) {
2490                 case 0:
2491                         event.event = RDMA_CM_EVENT_ESTABLISHED;
2492                         event.param.conn.initiator_depth = iw_event->ird;
2493                         event.param.conn.responder_resources = iw_event->ord;
2494                         break;
2495                 case -ECONNRESET:
2496                 case -ECONNREFUSED:
2497                         event.event = RDMA_CM_EVENT_REJECTED;
2498                         break;
2499                 case -ETIMEDOUT:
2500                         event.event = RDMA_CM_EVENT_UNREACHABLE;
2501                         break;
2502                 default:
2503                         event.event = RDMA_CM_EVENT_CONNECT_ERROR;
2504                         break;
2505                 }
2506                 break;
2507         case IW_CM_EVENT_ESTABLISHED:
2508                 event.event = RDMA_CM_EVENT_ESTABLISHED;
2509                 event.param.conn.initiator_depth = iw_event->ird;
2510                 event.param.conn.responder_resources = iw_event->ord;
2511                 break;
2512         default:
2513                 goto out;
2514         }
2515
2516         event.status = iw_event->status;
2517         event.param.conn.private_data = iw_event->private_data;
2518         event.param.conn.private_data_len = iw_event->private_data_len;
2519         ret = cma_cm_event_handler(id_priv, &event);
2520         if (ret) {
2521                 /* Destroy the CM ID by returning a non-zero value. */
2522                 id_priv->cm_id.iw = NULL;
2523                 destroy_id_handler_unlock(id_priv);
2524                 return ret;
2525         }
2526
2527 out:
2528         mutex_unlock(&id_priv->handler_mutex);
2529         return ret;
2530 }
2531
2532 static int iw_conn_req_handler(struct iw_cm_id *cm_id,
2533                                struct iw_cm_event *iw_event)
2534 {
2535         struct rdma_id_private *listen_id, *conn_id;
2536         struct rdma_cm_event event = {};
2537         int ret = -ECONNABORTED;
2538         struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr;
2539         struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr;
2540
2541         event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
2542         event.param.conn.private_data = iw_event->private_data;
2543         event.param.conn.private_data_len = iw_event->private_data_len;
2544         event.param.conn.initiator_depth = iw_event->ird;
2545         event.param.conn.responder_resources = iw_event->ord;
2546
2547         listen_id = cm_id->context;
2548
2549         mutex_lock(&listen_id->handler_mutex);
2550         if (READ_ONCE(listen_id->state) != RDMA_CM_LISTEN)
2551                 goto out;
2552
2553         /* Create a new RDMA id for the new IW CM ID */
2554         conn_id = __rdma_create_id(listen_id->id.route.addr.dev_addr.net,
2555                                    listen_id->id.event_handler,
2556                                    listen_id->id.context, RDMA_PS_TCP,
2557                                    IB_QPT_RC, listen_id);
2558         if (IS_ERR(conn_id)) {
2559                 ret = -ENOMEM;
2560                 goto out;
2561         }
2562         mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
2563         conn_id->state = RDMA_CM_CONNECT;
2564
2565         ret = rdma_translate_ip(laddr, &conn_id->id.route.addr.dev_addr);
2566         if (ret) {
2567                 mutex_unlock(&listen_id->handler_mutex);
2568                 destroy_id_handler_unlock(conn_id);
2569                 return ret;
2570         }
2571
2572         ret = cma_iw_acquire_dev(conn_id, listen_id);
2573         if (ret) {
2574                 mutex_unlock(&listen_id->handler_mutex);
2575                 destroy_id_handler_unlock(conn_id);
2576                 return ret;
2577         }
2578
2579         conn_id->cm_id.iw = cm_id;
2580         cm_id->context = conn_id;
2581         cm_id->cm_handler = cma_iw_handler;
2582
2583         memcpy(cma_src_addr(conn_id), laddr, rdma_addr_size(laddr));
2584         memcpy(cma_dst_addr(conn_id), raddr, rdma_addr_size(raddr));
2585
2586         ret = cma_cm_event_handler(conn_id, &event);
2587         if (ret) {
2588                 /* User wants to destroy the CM ID */
2589                 conn_id->cm_id.iw = NULL;
2590                 mutex_unlock(&listen_id->handler_mutex);
2591                 destroy_id_handler_unlock(conn_id);
2592                 return ret;
2593         }
2594
2595         mutex_unlock(&conn_id->handler_mutex);
2596
2597 out:
2598         mutex_unlock(&listen_id->handler_mutex);
2599         return ret;
2600 }
2601
2602 static int cma_ib_listen(struct rdma_id_private *id_priv)
2603 {
2604         struct sockaddr *addr;
2605         struct ib_cm_id *id;
2606         __be64 svc_id;
2607
2608         addr = cma_src_addr(id_priv);
2609         svc_id = rdma_get_service_id(&id_priv->id, addr);
2610         id = ib_cm_insert_listen(id_priv->id.device,
2611                                  cma_ib_req_handler, svc_id);
2612         if (IS_ERR(id))
2613                 return PTR_ERR(id);
2614         id_priv->cm_id.ib = id;
2615
2616         return 0;
2617 }
2618
2619 static int cma_iw_listen(struct rdma_id_private *id_priv, int backlog)
2620 {
2621         int ret;
2622         struct iw_cm_id *id;
2623
2624         id = iw_create_cm_id(id_priv->id.device,
2625                              iw_conn_req_handler,
2626                              id_priv);
2627         if (IS_ERR(id))
2628                 return PTR_ERR(id);
2629
2630         mutex_lock(&id_priv->qp_mutex);
2631         id->tos = id_priv->tos;
2632         id->tos_set = id_priv->tos_set;
2633         mutex_unlock(&id_priv->qp_mutex);
2634         id->afonly = id_priv->afonly;
2635         id_priv->cm_id.iw = id;
2636
2637         memcpy(&id_priv->cm_id.iw->local_addr, cma_src_addr(id_priv),
2638                rdma_addr_size(cma_src_addr(id_priv)));
2639
2640         ret = iw_cm_listen(id_priv->cm_id.iw, backlog);
2641
2642         if (ret) {
2643                 iw_destroy_cm_id(id_priv->cm_id.iw);
2644                 id_priv->cm_id.iw = NULL;
2645         }
2646
2647         return ret;
2648 }
2649
2650 static int cma_listen_handler(struct rdma_cm_id *id,
2651                               struct rdma_cm_event *event)
2652 {
2653         struct rdma_id_private *id_priv = id->context;
2654
2655         /* Listening IDs are always destroyed on removal */
2656         if (event->event == RDMA_CM_EVENT_DEVICE_REMOVAL)
2657                 return -1;
2658
2659         id->context = id_priv->id.context;
2660         id->event_handler = id_priv->id.event_handler;
2661         trace_cm_event_handler(id_priv, event);
2662         return id_priv->id.event_handler(id, event);
2663 }
2664
2665 static int cma_listen_on_dev(struct rdma_id_private *id_priv,
2666                              struct cma_device *cma_dev,
2667                              struct rdma_id_private **to_destroy)
2668 {
2669         struct rdma_id_private *dev_id_priv;
2670         struct net *net = id_priv->id.route.addr.dev_addr.net;
2671         int ret;
2672
2673         lockdep_assert_held(&lock);
2674
2675         *to_destroy = NULL;
2676         if (cma_family(id_priv) == AF_IB && !rdma_cap_ib_cm(cma_dev->device, 1))
2677                 return 0;
2678
2679         dev_id_priv =
2680                 __rdma_create_id(net, cma_listen_handler, id_priv,
2681                                  id_priv->id.ps, id_priv->id.qp_type, id_priv);
2682         if (IS_ERR(dev_id_priv))
2683                 return PTR_ERR(dev_id_priv);
2684
2685         dev_id_priv->state = RDMA_CM_ADDR_BOUND;
2686         memcpy(cma_src_addr(dev_id_priv), cma_src_addr(id_priv),
2687                rdma_addr_size(cma_src_addr(id_priv)));
2688
2689         _cma_attach_to_dev(dev_id_priv, cma_dev);
2690         rdma_restrack_add(&dev_id_priv->res);
2691         cma_id_get(id_priv);
2692         dev_id_priv->internal_id = 1;
2693         dev_id_priv->afonly = id_priv->afonly;
2694         mutex_lock(&id_priv->qp_mutex);
2695         dev_id_priv->tos_set = id_priv->tos_set;
2696         dev_id_priv->tos = id_priv->tos;
2697         mutex_unlock(&id_priv->qp_mutex);
2698
2699         ret = rdma_listen(&dev_id_priv->id, id_priv->backlog);
2700         if (ret)
2701                 goto err_listen;
2702         list_add_tail(&dev_id_priv->listen_item, &id_priv->listen_list);
2703         return 0;
2704 err_listen:
2705         /* Caller must destroy this after releasing lock */
2706         *to_destroy = dev_id_priv;
2707         dev_warn(&cma_dev->device->dev, "RDMA CMA: %s, error %d\n", __func__, ret);
2708         return ret;
2709 }
2710
2711 static int cma_listen_on_all(struct rdma_id_private *id_priv)
2712 {
2713         struct rdma_id_private *to_destroy;
2714         struct cma_device *cma_dev;
2715         int ret;
2716
2717         mutex_lock(&lock);
2718         list_add_tail(&id_priv->listen_any_item, &listen_any_list);
2719         list_for_each_entry(cma_dev, &dev_list, list) {
2720                 ret = cma_listen_on_dev(id_priv, cma_dev, &to_destroy);
2721                 if (ret) {
2722                         /* Prevent racing with cma_process_remove() */
2723                         if (to_destroy)
2724                                 list_del_init(&to_destroy->device_item);
2725                         goto err_listen;
2726                 }
2727         }
2728         mutex_unlock(&lock);
2729         return 0;
2730
2731 err_listen:
2732         _cma_cancel_listens(id_priv);
2733         mutex_unlock(&lock);
2734         if (to_destroy)
2735                 rdma_destroy_id(&to_destroy->id);
2736         return ret;
2737 }
2738
2739 void rdma_set_service_type(struct rdma_cm_id *id, int tos)
2740 {
2741         struct rdma_id_private *id_priv;
2742
2743         id_priv = container_of(id, struct rdma_id_private, id);
2744         mutex_lock(&id_priv->qp_mutex);
2745         id_priv->tos = (u8) tos;
2746         id_priv->tos_set = true;
2747         mutex_unlock(&id_priv->qp_mutex);
2748 }
2749 EXPORT_SYMBOL(rdma_set_service_type);
2750
2751 /**
2752  * rdma_set_ack_timeout() - Set the ack timeout of QP associated
2753  *                          with a connection identifier.
2754  * @id: Communication identifier to associated with service type.
2755  * @timeout: Ack timeout to set a QP, expressed as 4.096 * 2^(timeout) usec.
2756  *
2757  * This function should be called before rdma_connect() on active side,
2758  * and on passive side before rdma_accept(). It is applicable to primary
2759  * path only. The timeout will affect the local side of the QP, it is not
2760  * negotiated with remote side and zero disables the timer. In case it is
2761  * set before rdma_resolve_route, the value will also be used to determine
2762  * PacketLifeTime for RoCE.
2763  *
2764  * Return: 0 for success
2765  */
2766 int rdma_set_ack_timeout(struct rdma_cm_id *id, u8 timeout)
2767 {
2768         struct rdma_id_private *id_priv;
2769
2770         if (id->qp_type != IB_QPT_RC && id->qp_type != IB_QPT_XRC_INI)
2771                 return -EINVAL;
2772
2773         id_priv = container_of(id, struct rdma_id_private, id);
2774         mutex_lock(&id_priv->qp_mutex);
2775         id_priv->timeout = timeout;
2776         id_priv->timeout_set = true;
2777         mutex_unlock(&id_priv->qp_mutex);
2778
2779         return 0;
2780 }
2781 EXPORT_SYMBOL(rdma_set_ack_timeout);
2782
2783 /**
2784  * rdma_set_min_rnr_timer() - Set the minimum RNR Retry timer of the
2785  *                            QP associated with a connection identifier.
2786  * @id: Communication identifier to associated with service type.
2787  * @min_rnr_timer: 5-bit value encoded as Table 45: "Encoding for RNR NAK
2788  *                 Timer Field" in the IBTA specification.
2789  *
2790  * This function should be called before rdma_connect() on active
2791  * side, and on passive side before rdma_accept(). The timer value
2792  * will be associated with the local QP. When it receives a send it is
2793  * not read to handle, typically if the receive queue is empty, an RNR
2794  * Retry NAK is returned to the requester with the min_rnr_timer
2795  * encoded. The requester will then wait at least the time specified
2796  * in the NAK before retrying. The default is zero, which translates
2797  * to a minimum RNR Timer value of 655 ms.
2798  *
2799  * Return: 0 for success
2800  */
2801 int rdma_set_min_rnr_timer(struct rdma_cm_id *id, u8 min_rnr_timer)
2802 {
2803         struct rdma_id_private *id_priv;
2804
2805         /* It is a five-bit value */
2806         if (min_rnr_timer & 0xe0)
2807                 return -EINVAL;
2808
2809         if (WARN_ON(id->qp_type != IB_QPT_RC && id->qp_type != IB_QPT_XRC_TGT))
2810                 return -EINVAL;
2811
2812         id_priv = container_of(id, struct rdma_id_private, id);
2813         mutex_lock(&id_priv->qp_mutex);
2814         id_priv->min_rnr_timer = min_rnr_timer;
2815         id_priv->min_rnr_timer_set = true;
2816         mutex_unlock(&id_priv->qp_mutex);
2817
2818         return 0;
2819 }
2820 EXPORT_SYMBOL(rdma_set_min_rnr_timer);
2821
2822 static void route_set_path_rec_inbound(struct cma_work *work,
2823                                        struct sa_path_rec *path_rec)
2824 {
2825         struct rdma_route *route = &work->id->id.route;
2826
2827         if (!route->path_rec_inbound) {
2828                 route->path_rec_inbound =
2829                         kzalloc(sizeof(*route->path_rec_inbound), GFP_KERNEL);
2830                 if (!route->path_rec_inbound)
2831                         return;
2832         }
2833
2834         *route->path_rec_inbound = *path_rec;
2835 }
2836
2837 static void route_set_path_rec_outbound(struct cma_work *work,
2838                                         struct sa_path_rec *path_rec)
2839 {
2840         struct rdma_route *route = &work->id->id.route;
2841
2842         if (!route->path_rec_outbound) {
2843                 route->path_rec_outbound =
2844                         kzalloc(sizeof(*route->path_rec_outbound), GFP_KERNEL);
2845                 if (!route->path_rec_outbound)
2846                         return;
2847         }
2848
2849         *route->path_rec_outbound = *path_rec;
2850 }
2851
2852 static void cma_query_handler(int status, struct sa_path_rec *path_rec,
2853                               int num_prs, void *context)
2854 {
2855         struct cma_work *work = context;
2856         struct rdma_route *route;
2857         int i;
2858
2859         route = &work->id->id.route;
2860
2861         if (status)
2862                 goto fail;
2863
2864         for (i = 0; i < num_prs; i++) {
2865                 if (!path_rec[i].flags || (path_rec[i].flags & IB_PATH_GMP))
2866                         *route->path_rec = path_rec[i];
2867                 else if (path_rec[i].flags & IB_PATH_INBOUND)
2868                         route_set_path_rec_inbound(work, &path_rec[i]);
2869                 else if (path_rec[i].flags & IB_PATH_OUTBOUND)
2870                         route_set_path_rec_outbound(work, &path_rec[i]);
2871         }
2872         if (!route->path_rec) {
2873                 status = -EINVAL;
2874                 goto fail;
2875         }
2876
2877         route->num_pri_alt_paths = 1;
2878         queue_work(cma_wq, &work->work);
2879         return;
2880
2881 fail:
2882         work->old_state = RDMA_CM_ROUTE_QUERY;
2883         work->new_state = RDMA_CM_ADDR_RESOLVED;
2884         work->event.event = RDMA_CM_EVENT_ROUTE_ERROR;
2885         work->event.status = status;
2886         pr_debug_ratelimited("RDMA CM: ROUTE_ERROR: failed to query path. status %d\n",
2887                              status);
2888         queue_work(cma_wq, &work->work);
2889 }
2890
2891 static int cma_query_ib_route(struct rdma_id_private *id_priv,
2892                               unsigned long timeout_ms, struct cma_work *work)
2893 {
2894         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
2895         struct sa_path_rec path_rec;
2896         ib_sa_comp_mask comp_mask;
2897         struct sockaddr_in6 *sin6;
2898         struct sockaddr_ib *sib;
2899
2900         memset(&path_rec, 0, sizeof path_rec);
2901
2902         if (rdma_cap_opa_ah(id_priv->id.device, id_priv->id.port_num))
2903                 path_rec.rec_type = SA_PATH_REC_TYPE_OPA;
2904         else
2905                 path_rec.rec_type = SA_PATH_REC_TYPE_IB;
2906         rdma_addr_get_sgid(dev_addr, &path_rec.sgid);
2907         rdma_addr_get_dgid(dev_addr, &path_rec.dgid);
2908         path_rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
2909         path_rec.numb_path = 1;
2910         path_rec.reversible = 1;
2911         path_rec.service_id = rdma_get_service_id(&id_priv->id,
2912                                                   cma_dst_addr(id_priv));
2913
2914         comp_mask = IB_SA_PATH_REC_DGID | IB_SA_PATH_REC_SGID |
2915                     IB_SA_PATH_REC_PKEY | IB_SA_PATH_REC_NUMB_PATH |
2916                     IB_SA_PATH_REC_REVERSIBLE | IB_SA_PATH_REC_SERVICE_ID;
2917
2918         switch (cma_family(id_priv)) {
2919         case AF_INET:
2920                 path_rec.qos_class = cpu_to_be16((u16) id_priv->tos);
2921                 comp_mask |= IB_SA_PATH_REC_QOS_CLASS;
2922                 break;
2923         case AF_INET6:
2924                 sin6 = (struct sockaddr_in6 *) cma_src_addr(id_priv);
2925                 path_rec.traffic_class = (u8) (be32_to_cpu(sin6->sin6_flowinfo) >> 20);
2926                 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
2927                 break;
2928         case AF_IB:
2929                 sib = (struct sockaddr_ib *) cma_src_addr(id_priv);
2930                 path_rec.traffic_class = (u8) (be32_to_cpu(sib->sib_flowinfo) >> 20);
2931                 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
2932                 break;
2933         }
2934
2935         id_priv->query_id = ib_sa_path_rec_get(&sa_client, id_priv->id.device,
2936                                                id_priv->id.port_num, &path_rec,
2937                                                comp_mask, timeout_ms,
2938                                                GFP_KERNEL, cma_query_handler,
2939                                                work, &id_priv->query);
2940
2941         return (id_priv->query_id < 0) ? id_priv->query_id : 0;
2942 }
2943
2944 static void cma_iboe_join_work_handler(struct work_struct *work)
2945 {
2946         struct cma_multicast *mc =
2947                 container_of(work, struct cma_multicast, iboe_join.work);
2948         struct rdma_cm_event *event = &mc->iboe_join.event;
2949         struct rdma_id_private *id_priv = mc->id_priv;
2950         int ret;
2951
2952         mutex_lock(&id_priv->handler_mutex);
2953         if (READ_ONCE(id_priv->state) == RDMA_CM_DESTROYING ||
2954             READ_ONCE(id_priv->state) == RDMA_CM_DEVICE_REMOVAL)
2955                 goto out_unlock;
2956
2957         ret = cma_cm_event_handler(id_priv, event);
2958         WARN_ON(ret);
2959
2960 out_unlock:
2961         mutex_unlock(&id_priv->handler_mutex);
2962         if (event->event == RDMA_CM_EVENT_MULTICAST_JOIN)
2963                 rdma_destroy_ah_attr(&event->param.ud.ah_attr);
2964 }
2965
2966 static void cma_work_handler(struct work_struct *_work)
2967 {
2968         struct cma_work *work = container_of(_work, struct cma_work, work);
2969         struct rdma_id_private *id_priv = work->id;
2970
2971         mutex_lock(&id_priv->handler_mutex);
2972         if (READ_ONCE(id_priv->state) == RDMA_CM_DESTROYING ||
2973             READ_ONCE(id_priv->state) == RDMA_CM_DEVICE_REMOVAL)
2974                 goto out_unlock;
2975         if (work->old_state != 0 || work->new_state != 0) {
2976                 if (!cma_comp_exch(id_priv, work->old_state, work->new_state))
2977                         goto out_unlock;
2978         }
2979
2980         if (cma_cm_event_handler(id_priv, &work->event)) {
2981                 cma_id_put(id_priv);
2982                 destroy_id_handler_unlock(id_priv);
2983                 goto out_free;
2984         }
2985
2986 out_unlock:
2987         mutex_unlock(&id_priv->handler_mutex);
2988         cma_id_put(id_priv);
2989 out_free:
2990         if (work->event.event == RDMA_CM_EVENT_MULTICAST_JOIN)
2991                 rdma_destroy_ah_attr(&work->event.param.ud.ah_attr);
2992         kfree(work);
2993 }
2994
2995 static void cma_init_resolve_route_work(struct cma_work *work,
2996                                         struct rdma_id_private *id_priv)
2997 {
2998         work->id = id_priv;
2999         INIT_WORK(&work->work, cma_work_handler);
3000         work->old_state = RDMA_CM_ROUTE_QUERY;
3001         work->new_state = RDMA_CM_ROUTE_RESOLVED;
3002         work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
3003 }
3004
3005 static void enqueue_resolve_addr_work(struct cma_work *work,
3006                                       struct rdma_id_private *id_priv)
3007 {
3008         /* Balances with cma_id_put() in cma_work_handler */
3009         cma_id_get(id_priv);
3010
3011         work->id = id_priv;
3012         INIT_WORK(&work->work, cma_work_handler);
3013         work->old_state = RDMA_CM_ADDR_QUERY;
3014         work->new_state = RDMA_CM_ADDR_RESOLVED;
3015         work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
3016
3017         queue_work(cma_wq, &work->work);
3018 }
3019
3020 static int cma_resolve_ib_route(struct rdma_id_private *id_priv,
3021                                 unsigned long timeout_ms)
3022 {
3023         struct rdma_route *route = &id_priv->id.route;
3024         struct cma_work *work;
3025         int ret;
3026
3027         work = kzalloc(sizeof *work, GFP_KERNEL);
3028         if (!work)
3029                 return -ENOMEM;
3030
3031         cma_init_resolve_route_work(work, id_priv);
3032
3033         if (!route->path_rec)
3034                 route->path_rec = kmalloc(sizeof *route->path_rec, GFP_KERNEL);
3035         if (!route->path_rec) {
3036                 ret = -ENOMEM;
3037                 goto err1;
3038         }
3039
3040         ret = cma_query_ib_route(id_priv, timeout_ms, work);
3041         if (ret)
3042                 goto err2;
3043
3044         return 0;
3045 err2:
3046         kfree(route->path_rec);
3047         route->path_rec = NULL;
3048 err1:
3049         kfree(work);
3050         return ret;
3051 }
3052
3053 static enum ib_gid_type cma_route_gid_type(enum rdma_network_type network_type,
3054                                            unsigned long supported_gids,
3055                                            enum ib_gid_type default_gid)
3056 {
3057         if ((network_type == RDMA_NETWORK_IPV4 ||
3058              network_type == RDMA_NETWORK_IPV6) &&
3059             test_bit(IB_GID_TYPE_ROCE_UDP_ENCAP, &supported_gids))
3060                 return IB_GID_TYPE_ROCE_UDP_ENCAP;
3061
3062         return default_gid;
3063 }
3064
3065 /*
3066  * cma_iboe_set_path_rec_l2_fields() is helper function which sets
3067  * path record type based on GID type.
3068  * It also sets up other L2 fields which includes destination mac address
3069  * netdev ifindex, of the path record.
3070  * It returns the netdev of the bound interface for this path record entry.
3071  */
3072 static struct net_device *
3073 cma_iboe_set_path_rec_l2_fields(struct rdma_id_private *id_priv)
3074 {
3075         struct rdma_route *route = &id_priv->id.route;
3076         enum ib_gid_type gid_type = IB_GID_TYPE_ROCE;
3077         struct rdma_addr *addr = &route->addr;
3078         unsigned long supported_gids;
3079         struct net_device *ndev;
3080
3081         if (!addr->dev_addr.bound_dev_if)
3082                 return NULL;
3083
3084         ndev = dev_get_by_index(addr->dev_addr.net,
3085                                 addr->dev_addr.bound_dev_if);
3086         if (!ndev)
3087                 return NULL;
3088
3089         supported_gids = roce_gid_type_mask_support(id_priv->id.device,
3090                                                     id_priv->id.port_num);
3091         gid_type = cma_route_gid_type(addr->dev_addr.network,
3092                                       supported_gids,
3093                                       id_priv->gid_type);
3094         /* Use the hint from IP Stack to select GID Type */
3095         if (gid_type < ib_network_to_gid_type(addr->dev_addr.network))
3096                 gid_type = ib_network_to_gid_type(addr->dev_addr.network);
3097         route->path_rec->rec_type = sa_conv_gid_to_pathrec_type(gid_type);
3098
3099         route->path_rec->roce.route_resolved = true;
3100         sa_path_set_dmac(route->path_rec, addr->dev_addr.dst_dev_addr);
3101         return ndev;
3102 }
3103
3104 int rdma_set_ib_path(struct rdma_cm_id *id,
3105                      struct sa_path_rec *path_rec)
3106 {
3107         struct rdma_id_private *id_priv;
3108         struct net_device *ndev;
3109         int ret;
3110
3111         id_priv = container_of(id, struct rdma_id_private, id);
3112         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
3113                            RDMA_CM_ROUTE_RESOLVED))
3114                 return -EINVAL;
3115
3116         id->route.path_rec = kmemdup(path_rec, sizeof(*path_rec),
3117                                      GFP_KERNEL);
3118         if (!id->route.path_rec) {
3119                 ret = -ENOMEM;
3120                 goto err;
3121         }
3122
3123         if (rdma_protocol_roce(id->device, id->port_num)) {
3124                 ndev = cma_iboe_set_path_rec_l2_fields(id_priv);
3125                 if (!ndev) {
3126                         ret = -ENODEV;
3127                         goto err_free;
3128                 }
3129                 dev_put(ndev);
3130         }
3131
3132         id->route.num_pri_alt_paths = 1;
3133         return 0;
3134
3135 err_free:
3136         kfree(id->route.path_rec);
3137         id->route.path_rec = NULL;
3138 err:
3139         cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_ADDR_RESOLVED);
3140         return ret;
3141 }
3142 EXPORT_SYMBOL(rdma_set_ib_path);
3143
3144 static int cma_resolve_iw_route(struct rdma_id_private *id_priv)
3145 {
3146         struct cma_work *work;
3147
3148         work = kzalloc(sizeof *work, GFP_KERNEL);
3149         if (!work)
3150                 return -ENOMEM;
3151
3152         cma_init_resolve_route_work(work, id_priv);
3153         queue_work(cma_wq, &work->work);
3154         return 0;
3155 }
3156
3157 static int get_vlan_ndev_tc(struct net_device *vlan_ndev, int prio)
3158 {
3159         struct net_device *dev;
3160
3161         dev = vlan_dev_real_dev(vlan_ndev);
3162         if (dev->num_tc)
3163                 return netdev_get_prio_tc_map(dev, prio);
3164
3165         return (vlan_dev_get_egress_qos_mask(vlan_ndev, prio) &
3166                 VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
3167 }
3168
3169 struct iboe_prio_tc_map {
3170         int input_prio;
3171         int output_tc;
3172         bool found;
3173 };
3174
3175 static int get_lower_vlan_dev_tc(struct net_device *dev,
3176                                  struct netdev_nested_priv *priv)
3177 {
3178         struct iboe_prio_tc_map *map = (struct iboe_prio_tc_map *)priv->data;
3179
3180         if (is_vlan_dev(dev))
3181                 map->output_tc = get_vlan_ndev_tc(dev, map->input_prio);
3182         else if (dev->num_tc)
3183                 map->output_tc = netdev_get_prio_tc_map(dev, map->input_prio);
3184         else
3185                 map->output_tc = 0;
3186         /* We are interested only in first level VLAN device, so always
3187          * return 1 to stop iterating over next level devices.
3188          */
3189         map->found = true;
3190         return 1;
3191 }
3192
3193 static int iboe_tos_to_sl(struct net_device *ndev, int tos)
3194 {
3195         struct iboe_prio_tc_map prio_tc_map = {};
3196         int prio = rt_tos2priority(tos);
3197         struct netdev_nested_priv priv;
3198
3199         /* If VLAN device, get it directly from the VLAN netdev */
3200         if (is_vlan_dev(ndev))
3201                 return get_vlan_ndev_tc(ndev, prio);
3202
3203         prio_tc_map.input_prio = prio;
3204         priv.data = (void *)&prio_tc_map;
3205         rcu_read_lock();
3206         netdev_walk_all_lower_dev_rcu(ndev,
3207                                       get_lower_vlan_dev_tc,
3208                                       &priv);
3209         rcu_read_unlock();
3210         /* If map is found from lower device, use it; Otherwise
3211          * continue with the current netdevice to get priority to tc map.
3212          */
3213         if (prio_tc_map.found)
3214                 return prio_tc_map.output_tc;
3215         else if (ndev->num_tc)
3216                 return netdev_get_prio_tc_map(ndev, prio);
3217         else
3218                 return 0;
3219 }
3220
3221 static __be32 cma_get_roce_udp_flow_label(struct rdma_id_private *id_priv)
3222 {
3223         struct sockaddr_in6 *addr6;
3224         u16 dport, sport;
3225         u32 hash, fl;
3226
3227         addr6 = (struct sockaddr_in6 *)cma_src_addr(id_priv);
3228         fl = be32_to_cpu(addr6->sin6_flowinfo) & IB_GRH_FLOWLABEL_MASK;
3229         if ((cma_family(id_priv) != AF_INET6) || !fl) {
3230                 dport = be16_to_cpu(cma_port(cma_dst_addr(id_priv)));
3231                 sport = be16_to_cpu(cma_port(cma_src_addr(id_priv)));
3232                 hash = (u32)sport * 31 + dport;
3233                 fl = hash & IB_GRH_FLOWLABEL_MASK;
3234         }
3235
3236         return cpu_to_be32(fl);
3237 }
3238
3239 static int cma_resolve_iboe_route(struct rdma_id_private *id_priv)
3240 {
3241         struct rdma_route *route = &id_priv->id.route;
3242         struct rdma_addr *addr = &route->addr;
3243         struct cma_work *work;
3244         int ret;
3245         struct net_device *ndev;
3246
3247         u8 default_roce_tos = id_priv->cma_dev->default_roce_tos[id_priv->id.port_num -
3248                                         rdma_start_port(id_priv->cma_dev->device)];
3249         u8 tos;
3250
3251         mutex_lock(&id_priv->qp_mutex);
3252         tos = id_priv->tos_set ? id_priv->tos : default_roce_tos;
3253         mutex_unlock(&id_priv->qp_mutex);
3254
3255         work = kzalloc(sizeof *work, GFP_KERNEL);
3256         if (!work)
3257                 return -ENOMEM;
3258
3259         route->path_rec = kzalloc(sizeof *route->path_rec, GFP_KERNEL);
3260         if (!route->path_rec) {
3261                 ret = -ENOMEM;
3262                 goto err1;
3263         }
3264
3265         route->num_pri_alt_paths = 1;
3266
3267         ndev = cma_iboe_set_path_rec_l2_fields(id_priv);
3268         if (!ndev) {
3269                 ret = -ENODEV;
3270                 goto err2;
3271         }
3272
3273         rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
3274                     &route->path_rec->sgid);
3275         rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.dst_addr,
3276                     &route->path_rec->dgid);
3277
3278         if (((struct sockaddr *)&id_priv->id.route.addr.dst_addr)->sa_family != AF_IB)
3279                 /* TODO: get the hoplimit from the inet/inet6 device */
3280                 route->path_rec->hop_limit = addr->dev_addr.hoplimit;
3281         else
3282                 route->path_rec->hop_limit = 1;
3283         route->path_rec->reversible = 1;
3284         route->path_rec->pkey = cpu_to_be16(0xffff);
3285         route->path_rec->mtu_selector = IB_SA_EQ;
3286         route->path_rec->sl = iboe_tos_to_sl(ndev, tos);
3287         route->path_rec->traffic_class = tos;
3288         route->path_rec->mtu = iboe_get_mtu(ndev->mtu);
3289         route->path_rec->rate_selector = IB_SA_EQ;
3290         route->path_rec->rate = iboe_get_rate(ndev);
3291         dev_put(ndev);
3292         route->path_rec->packet_life_time_selector = IB_SA_EQ;
3293         /* In case ACK timeout is set, use this value to calculate
3294          * PacketLifeTime.  As per IBTA 12.7.34,
3295          * local ACK timeout = (2 * PacketLifeTime + Local CA’s ACK delay).
3296          * Assuming a negligible local ACK delay, we can use
3297          * PacketLifeTime = local ACK timeout/2
3298          * as a reasonable approximation for RoCE networks.
3299          */
3300         mutex_lock(&id_priv->qp_mutex);
3301         if (id_priv->timeout_set && id_priv->timeout)
3302                 route->path_rec->packet_life_time = id_priv->timeout - 1;
3303         else
3304                 route->path_rec->packet_life_time = CMA_IBOE_PACKET_LIFETIME;
3305         mutex_unlock(&id_priv->qp_mutex);
3306
3307         if (!route->path_rec->mtu) {
3308                 ret = -EINVAL;
3309                 goto err2;
3310         }
3311
3312         if (rdma_protocol_roce_udp_encap(id_priv->id.device,
3313                                          id_priv->id.port_num))
3314                 route->path_rec->flow_label =
3315                         cma_get_roce_udp_flow_label(id_priv);
3316
3317         cma_init_resolve_route_work(work, id_priv);
3318         queue_work(cma_wq, &work->work);
3319
3320         return 0;
3321
3322 err2:
3323         kfree(route->path_rec);
3324         route->path_rec = NULL;
3325         route->num_pri_alt_paths = 0;
3326 err1:
3327         kfree(work);
3328         return ret;
3329 }
3330
3331 int rdma_resolve_route(struct rdma_cm_id *id, unsigned long timeout_ms)
3332 {
3333         struct rdma_id_private *id_priv;
3334         int ret;
3335
3336         if (!timeout_ms)
3337                 return -EINVAL;
3338
3339         id_priv = container_of(id, struct rdma_id_private, id);
3340         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED, RDMA_CM_ROUTE_QUERY))
3341                 return -EINVAL;
3342
3343         cma_id_get(id_priv);
3344         if (rdma_cap_ib_sa(id->device, id->port_num))
3345                 ret = cma_resolve_ib_route(id_priv, timeout_ms);
3346         else if (rdma_protocol_roce(id->device, id->port_num)) {
3347                 ret = cma_resolve_iboe_route(id_priv);
3348                 if (!ret)
3349                         cma_add_id_to_tree(id_priv);
3350         }
3351         else if (rdma_protocol_iwarp(id->device, id->port_num))
3352                 ret = cma_resolve_iw_route(id_priv);
3353         else
3354                 ret = -ENOSYS;
3355
3356         if (ret)
3357                 goto err;
3358
3359         return 0;
3360 err:
3361         cma_comp_exch(id_priv, RDMA_CM_ROUTE_QUERY, RDMA_CM_ADDR_RESOLVED);
3362         cma_id_put(id_priv);
3363         return ret;
3364 }
3365 EXPORT_SYMBOL(rdma_resolve_route);
3366
3367 static void cma_set_loopback(struct sockaddr *addr)
3368 {
3369         switch (addr->sa_family) {
3370         case AF_INET:
3371                 ((struct sockaddr_in *) addr)->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
3372                 break;
3373         case AF_INET6:
3374                 ipv6_addr_set(&((struct sockaddr_in6 *) addr)->sin6_addr,
3375                               0, 0, 0, htonl(1));
3376                 break;
3377         default:
3378                 ib_addr_set(&((struct sockaddr_ib *) addr)->sib_addr,
3379                             0, 0, 0, htonl(1));
3380                 break;
3381         }
3382 }
3383
3384 static int cma_bind_loopback(struct rdma_id_private *id_priv)
3385 {
3386         struct cma_device *cma_dev, *cur_dev;
3387         union ib_gid gid;
3388         enum ib_port_state port_state;
3389         unsigned int p;
3390         u16 pkey;
3391         int ret;
3392
3393         cma_dev = NULL;
3394         mutex_lock(&lock);
3395         list_for_each_entry(cur_dev, &dev_list, list) {
3396                 if (cma_family(id_priv) == AF_IB &&
3397                     !rdma_cap_ib_cm(cur_dev->device, 1))
3398                         continue;
3399
3400                 if (!cma_dev)
3401                         cma_dev = cur_dev;
3402
3403                 rdma_for_each_port (cur_dev->device, p) {
3404                         if (!ib_get_cached_port_state(cur_dev->device, p, &port_state) &&
3405                             port_state == IB_PORT_ACTIVE) {
3406                                 cma_dev = cur_dev;
3407                                 goto port_found;
3408                         }
3409                 }
3410         }
3411
3412         if (!cma_dev) {
3413                 ret = -ENODEV;
3414                 goto out;
3415         }
3416
3417         p = 1;
3418
3419 port_found:
3420         ret = rdma_query_gid(cma_dev->device, p, 0, &gid);
3421         if (ret)
3422                 goto out;
3423
3424         ret = ib_get_cached_pkey(cma_dev->device, p, 0, &pkey);
3425         if (ret)
3426                 goto out;
3427
3428         id_priv->id.route.addr.dev_addr.dev_type =
3429                 (rdma_protocol_ib(cma_dev->device, p)) ?
3430                 ARPHRD_INFINIBAND : ARPHRD_ETHER;
3431
3432         rdma_addr_set_sgid(&id_priv->id.route.addr.dev_addr, &gid);
3433         ib_addr_set_pkey(&id_priv->id.route.addr.dev_addr, pkey);
3434         id_priv->id.port_num = p;
3435         cma_attach_to_dev(id_priv, cma_dev);
3436         rdma_restrack_add(&id_priv->res);
3437         cma_set_loopback(cma_src_addr(id_priv));
3438 out:
3439         mutex_unlock(&lock);
3440         return ret;
3441 }
3442
3443 static void addr_handler(int status, struct sockaddr *src_addr,
3444                          struct rdma_dev_addr *dev_addr, void *context)
3445 {
3446         struct rdma_id_private *id_priv = context;
3447         struct rdma_cm_event event = {};
3448         struct sockaddr *addr;
3449         struct sockaddr_storage old_addr;
3450
3451         mutex_lock(&id_priv->handler_mutex);
3452         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY,
3453                            RDMA_CM_ADDR_RESOLVED))
3454                 goto out;
3455
3456         /*
3457          * Store the previous src address, so that if we fail to acquire
3458          * matching rdma device, old address can be restored back, which helps
3459          * to cancel the cma listen operation correctly.
3460          */
3461         addr = cma_src_addr(id_priv);
3462         memcpy(&old_addr, addr, rdma_addr_size(addr));
3463         memcpy(addr, src_addr, rdma_addr_size(src_addr));
3464         if (!status && !id_priv->cma_dev) {
3465                 status = cma_acquire_dev_by_src_ip(id_priv);
3466                 if (status)
3467                         pr_debug_ratelimited("RDMA CM: ADDR_ERROR: failed to acquire device. status %d\n",
3468                                              status);
3469                 rdma_restrack_add(&id_priv->res);
3470         } else if (status) {
3471                 pr_debug_ratelimited("RDMA CM: ADDR_ERROR: failed to resolve IP. status %d\n", status);
3472         }
3473
3474         if (status) {
3475                 memcpy(addr, &old_addr,
3476                        rdma_addr_size((struct sockaddr *)&old_addr));
3477                 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
3478                                    RDMA_CM_ADDR_BOUND))
3479                         goto out;
3480                 event.event = RDMA_CM_EVENT_ADDR_ERROR;
3481                 event.status = status;
3482         } else
3483                 event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
3484
3485         if (cma_cm_event_handler(id_priv, &event)) {
3486                 destroy_id_handler_unlock(id_priv);
3487                 return;
3488         }
3489 out:
3490         mutex_unlock(&id_priv->handler_mutex);
3491 }
3492
3493 static int cma_resolve_loopback(struct rdma_id_private *id_priv)
3494 {
3495         struct cma_work *work;
3496         union ib_gid gid;
3497         int ret;
3498
3499         work = kzalloc(sizeof *work, GFP_KERNEL);
3500         if (!work)
3501                 return -ENOMEM;
3502
3503         if (!id_priv->cma_dev) {
3504                 ret = cma_bind_loopback(id_priv);
3505                 if (ret)
3506                         goto err;
3507         }
3508
3509         rdma_addr_get_sgid(&id_priv->id.route.addr.dev_addr, &gid);
3510         rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, &gid);
3511
3512         enqueue_resolve_addr_work(work, id_priv);
3513         return 0;
3514 err:
3515         kfree(work);
3516         return ret;
3517 }
3518
3519 static int cma_resolve_ib_addr(struct rdma_id_private *id_priv)
3520 {
3521         struct cma_work *work;
3522         int ret;
3523
3524         work = kzalloc(sizeof *work, GFP_KERNEL);
3525         if (!work)
3526                 return -ENOMEM;
3527
3528         if (!id_priv->cma_dev) {
3529                 ret = cma_resolve_ib_dev(id_priv);
3530                 if (ret)
3531                         goto err;
3532         }
3533
3534         rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, (union ib_gid *)
3535                 &(((struct sockaddr_ib *) &id_priv->id.route.addr.dst_addr)->sib_addr));
3536
3537         enqueue_resolve_addr_work(work, id_priv);
3538         return 0;
3539 err:
3540         kfree(work);
3541         return ret;
3542 }
3543
3544 static int cma_bind_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
3545                          const struct sockaddr *dst_addr)
3546 {
3547         struct sockaddr_storage zero_sock = {};
3548
3549         if (src_addr && src_addr->sa_family)
3550                 return rdma_bind_addr(id, src_addr);
3551
3552         /*
3553          * When the src_addr is not specified, automatically supply an any addr
3554          */
3555         zero_sock.ss_family = dst_addr->sa_family;
3556         if (IS_ENABLED(CONFIG_IPV6) && dst_addr->sa_family == AF_INET6) {
3557                 struct sockaddr_in6 *src_addr6 =
3558                         (struct sockaddr_in6 *)&zero_sock;
3559                 struct sockaddr_in6 *dst_addr6 =
3560                         (struct sockaddr_in6 *)dst_addr;
3561
3562                 src_addr6->sin6_scope_id = dst_addr6->sin6_scope_id;
3563                 if (ipv6_addr_type(&dst_addr6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
3564                         id->route.addr.dev_addr.bound_dev_if =
3565                                 dst_addr6->sin6_scope_id;
3566         } else if (dst_addr->sa_family == AF_IB) {
3567                 ((struct sockaddr_ib *)&zero_sock)->sib_pkey =
3568                         ((struct sockaddr_ib *)dst_addr)->sib_pkey;
3569         }
3570         return rdma_bind_addr(id, (struct sockaddr *)&zero_sock);
3571 }
3572
3573 /*
3574  * If required, resolve the source address for bind and leave the id_priv in
3575  * state RDMA_CM_ADDR_BOUND. This oddly uses the state to determine the prior
3576  * calls made by ULP, a previously bound ID will not be re-bound and src_addr is
3577  * ignored.
3578  */
3579 static int resolve_prepare_src(struct rdma_id_private *id_priv,
3580                                struct sockaddr *src_addr,
3581                                const struct sockaddr *dst_addr)
3582 {
3583         int ret;
3584
3585         memcpy(cma_dst_addr(id_priv), dst_addr, rdma_addr_size(dst_addr));
3586         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_ADDR_QUERY)) {
3587                 /* For a well behaved ULP state will be RDMA_CM_IDLE */
3588                 ret = cma_bind_addr(&id_priv->id, src_addr, dst_addr);
3589                 if (ret)
3590                         goto err_dst;
3591                 if (WARN_ON(!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND,
3592                                            RDMA_CM_ADDR_QUERY))) {
3593                         ret = -EINVAL;
3594                         goto err_dst;
3595                 }
3596         }
3597
3598         if (cma_family(id_priv) != dst_addr->sa_family) {
3599                 ret = -EINVAL;
3600                 goto err_state;
3601         }
3602         return 0;
3603
3604 err_state:
3605         cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY, RDMA_CM_ADDR_BOUND);
3606 err_dst:
3607         memset(cma_dst_addr(id_priv), 0, rdma_addr_size(dst_addr));
3608         return ret;
3609 }
3610
3611 int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
3612                       const struct sockaddr *dst_addr, unsigned long timeout_ms)
3613 {
3614         struct rdma_id_private *id_priv =
3615                 container_of(id, struct rdma_id_private, id);
3616         int ret;
3617
3618         ret = resolve_prepare_src(id_priv, src_addr, dst_addr);
3619         if (ret)
3620                 return ret;
3621
3622         if (cma_any_addr(dst_addr)) {
3623                 ret = cma_resolve_loopback(id_priv);
3624         } else {
3625                 if (dst_addr->sa_family == AF_IB) {
3626                         ret = cma_resolve_ib_addr(id_priv);
3627                 } else {
3628                         /*
3629                          * The FSM can return back to RDMA_CM_ADDR_BOUND after
3630                          * rdma_resolve_ip() is called, eg through the error
3631                          * path in addr_handler(). If this happens the existing
3632                          * request must be canceled before issuing a new one.
3633                          * Since canceling a request is a bit slow and this
3634                          * oddball path is rare, keep track once a request has
3635                          * been issued. The track turns out to be a permanent
3636                          * state since this is the only cancel as it is
3637                          * immediately before rdma_resolve_ip().
3638                          */
3639                         if (id_priv->used_resolve_ip)
3640                                 rdma_addr_cancel(&id->route.addr.dev_addr);
3641                         else
3642                                 id_priv->used_resolve_ip = 1;
3643                         ret = rdma_resolve_ip(cma_src_addr(id_priv), dst_addr,
3644                                               &id->route.addr.dev_addr,
3645                                               timeout_ms, addr_handler,
3646                                               false, id_priv);
3647                 }
3648         }
3649         if (ret)
3650                 goto err;
3651
3652         return 0;
3653 err:
3654         cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY, RDMA_CM_ADDR_BOUND);
3655         return ret;
3656 }
3657 EXPORT_SYMBOL(rdma_resolve_addr);
3658
3659 int rdma_set_reuseaddr(struct rdma_cm_id *id, int reuse)
3660 {
3661         struct rdma_id_private *id_priv;
3662         unsigned long flags;
3663         int ret;
3664
3665         id_priv = container_of(id, struct rdma_id_private, id);
3666         spin_lock_irqsave(&id_priv->lock, flags);
3667         if ((reuse && id_priv->state != RDMA_CM_LISTEN) ||
3668             id_priv->state == RDMA_CM_IDLE) {
3669                 id_priv->reuseaddr = reuse;
3670                 ret = 0;
3671         } else {
3672                 ret = -EINVAL;
3673         }
3674         spin_unlock_irqrestore(&id_priv->lock, flags);
3675         return ret;
3676 }
3677 EXPORT_SYMBOL(rdma_set_reuseaddr);
3678
3679 int rdma_set_afonly(struct rdma_cm_id *id, int afonly)
3680 {
3681         struct rdma_id_private *id_priv;
3682         unsigned long flags;
3683         int ret;
3684
3685         id_priv = container_of(id, struct rdma_id_private, id);
3686         spin_lock_irqsave(&id_priv->lock, flags);
3687         if (id_priv->state == RDMA_CM_IDLE || id_priv->state == RDMA_CM_ADDR_BOUND) {
3688                 id_priv->options |= (1 << CMA_OPTION_AFONLY);
3689                 id_priv->afonly = afonly;
3690                 ret = 0;
3691         } else {
3692                 ret = -EINVAL;
3693         }
3694         spin_unlock_irqrestore(&id_priv->lock, flags);
3695         return ret;
3696 }
3697 EXPORT_SYMBOL(rdma_set_afonly);
3698
3699 static void cma_bind_port(struct rdma_bind_list *bind_list,
3700                           struct rdma_id_private *id_priv)
3701 {
3702         struct sockaddr *addr;
3703         struct sockaddr_ib *sib;
3704         u64 sid, mask;
3705         __be16 port;
3706
3707         lockdep_assert_held(&lock);
3708
3709         addr = cma_src_addr(id_priv);
3710         port = htons(bind_list->port);
3711
3712         switch (addr->sa_family) {
3713         case AF_INET:
3714                 ((struct sockaddr_in *) addr)->sin_port = port;
3715                 break;
3716         case AF_INET6:
3717                 ((struct sockaddr_in6 *) addr)->sin6_port = port;
3718                 break;
3719         case AF_IB:
3720                 sib = (struct sockaddr_ib *) addr;
3721                 sid = be64_to_cpu(sib->sib_sid);
3722                 mask = be64_to_cpu(sib->sib_sid_mask);
3723                 sib->sib_sid = cpu_to_be64((sid & mask) | (u64) ntohs(port));
3724                 sib->sib_sid_mask = cpu_to_be64(~0ULL);
3725                 break;
3726         }
3727         id_priv->bind_list = bind_list;
3728         hlist_add_head(&id_priv->node, &bind_list->owners);
3729 }
3730
3731 static int cma_alloc_port(enum rdma_ucm_port_space ps,
3732                           struct rdma_id_private *id_priv, unsigned short snum)
3733 {
3734         struct rdma_bind_list *bind_list;
3735         int ret;
3736
3737         lockdep_assert_held(&lock);
3738
3739         bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL);
3740         if (!bind_list)
3741                 return -ENOMEM;
3742
3743         ret = cma_ps_alloc(id_priv->id.route.addr.dev_addr.net, ps, bind_list,
3744                            snum);
3745         if (ret < 0)
3746                 goto err;
3747
3748         bind_list->ps = ps;
3749         bind_list->port = snum;
3750         cma_bind_port(bind_list, id_priv);
3751         return 0;
3752 err:
3753         kfree(bind_list);
3754         return ret == -ENOSPC ? -EADDRNOTAVAIL : ret;
3755 }
3756
3757 static int cma_port_is_unique(struct rdma_bind_list *bind_list,
3758                               struct rdma_id_private *id_priv)
3759 {
3760         struct rdma_id_private *cur_id;
3761         struct sockaddr  *daddr = cma_dst_addr(id_priv);
3762         struct sockaddr  *saddr = cma_src_addr(id_priv);
3763         __be16 dport = cma_port(daddr);
3764
3765         lockdep_assert_held(&lock);
3766
3767         hlist_for_each_entry(cur_id, &bind_list->owners, node) {
3768                 struct sockaddr  *cur_daddr = cma_dst_addr(cur_id);
3769                 struct sockaddr  *cur_saddr = cma_src_addr(cur_id);
3770                 __be16 cur_dport = cma_port(cur_daddr);
3771
3772                 if (id_priv == cur_id)
3773                         continue;
3774
3775                 /* different dest port -> unique */
3776                 if (!cma_any_port(daddr) &&
3777                     !cma_any_port(cur_daddr) &&
3778                     (dport != cur_dport))
3779                         continue;
3780
3781                 /* different src address -> unique */
3782                 if (!cma_any_addr(saddr) &&
3783                     !cma_any_addr(cur_saddr) &&
3784                     cma_addr_cmp(saddr, cur_saddr))
3785                         continue;
3786
3787                 /* different dst address -> unique */
3788                 if (!cma_any_addr(daddr) &&
3789                     !cma_any_addr(cur_daddr) &&
3790                     cma_addr_cmp(daddr, cur_daddr))
3791                         continue;
3792
3793                 return -EADDRNOTAVAIL;
3794         }
3795         return 0;
3796 }
3797
3798 static int cma_alloc_any_port(enum rdma_ucm_port_space ps,
3799                               struct rdma_id_private *id_priv)
3800 {
3801         static unsigned int last_used_port;
3802         int low, high, remaining;
3803         unsigned int rover;
3804         struct net *net = id_priv->id.route.addr.dev_addr.net;
3805
3806         lockdep_assert_held(&lock);
3807
3808         inet_get_local_port_range(net, &low, &high);
3809         remaining = (high - low) + 1;
3810         rover = prandom_u32_max(remaining) + low;
3811 retry:
3812         if (last_used_port != rover) {
3813                 struct rdma_bind_list *bind_list;
3814                 int ret;
3815
3816                 bind_list = cma_ps_find(net, ps, (unsigned short)rover);
3817
3818                 if (!bind_list) {
3819                         ret = cma_alloc_port(ps, id_priv, rover);
3820                 } else {
3821                         ret = cma_port_is_unique(bind_list, id_priv);
3822                         if (!ret)
3823                                 cma_bind_port(bind_list, id_priv);
3824                 }
3825                 /*
3826                  * Remember previously used port number in order to avoid
3827                  * re-using same port immediately after it is closed.
3828                  */
3829                 if (!ret)
3830                         last_used_port = rover;
3831                 if (ret != -EADDRNOTAVAIL)
3832                         return ret;
3833         }
3834         if (--remaining) {
3835                 rover++;
3836                 if ((rover < low) || (rover > high))
3837                         rover = low;
3838                 goto retry;
3839         }
3840         return -EADDRNOTAVAIL;
3841 }
3842
3843 /*
3844  * Check that the requested port is available.  This is called when trying to
3845  * bind to a specific port, or when trying to listen on a bound port.  In
3846  * the latter case, the provided id_priv may already be on the bind_list, but
3847  * we still need to check that it's okay to start listening.
3848  */
3849 static int cma_check_port(struct rdma_bind_list *bind_list,
3850                           struct rdma_id_private *id_priv, uint8_t reuseaddr)
3851 {
3852         struct rdma_id_private *cur_id;
3853         struct sockaddr *addr, *cur_addr;
3854
3855         lockdep_assert_held(&lock);
3856
3857         addr = cma_src_addr(id_priv);
3858         hlist_for_each_entry(cur_id, &bind_list->owners, node) {
3859                 if (id_priv == cur_id)
3860                         continue;
3861
3862                 if (reuseaddr && cur_id->reuseaddr)
3863                         continue;
3864
3865                 cur_addr = cma_src_addr(cur_id);
3866                 if (id_priv->afonly && cur_id->afonly &&
3867                     (addr->sa_family != cur_addr->sa_family))
3868                         continue;
3869
3870                 if (cma_any_addr(addr) || cma_any_addr(cur_addr))
3871                         return -EADDRNOTAVAIL;
3872
3873                 if (!cma_addr_cmp(addr, cur_addr))
3874                         return -EADDRINUSE;
3875         }
3876         return 0;
3877 }
3878
3879 static int cma_use_port(enum rdma_ucm_port_space ps,
3880                         struct rdma_id_private *id_priv)
3881 {
3882         struct rdma_bind_list *bind_list;
3883         unsigned short snum;
3884         int ret;
3885
3886         lockdep_assert_held(&lock);
3887
3888         snum = ntohs(cma_port(cma_src_addr(id_priv)));
3889         if (snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
3890                 return -EACCES;
3891
3892         bind_list = cma_ps_find(id_priv->id.route.addr.dev_addr.net, ps, snum);
3893         if (!bind_list) {
3894                 ret = cma_alloc_port(ps, id_priv, snum);
3895         } else {
3896                 ret = cma_check_port(bind_list, id_priv, id_priv->reuseaddr);
3897                 if (!ret)
3898                         cma_bind_port(bind_list, id_priv);
3899         }
3900         return ret;
3901 }
3902
3903 static enum rdma_ucm_port_space
3904 cma_select_inet_ps(struct rdma_id_private *id_priv)
3905 {
3906         switch (id_priv->id.ps) {
3907         case RDMA_PS_TCP:
3908         case RDMA_PS_UDP:
3909         case RDMA_PS_IPOIB:
3910         case RDMA_PS_IB:
3911                 return id_priv->id.ps;
3912         default:
3913
3914                 return 0;
3915         }
3916 }
3917
3918 static enum rdma_ucm_port_space
3919 cma_select_ib_ps(struct rdma_id_private *id_priv)
3920 {
3921         enum rdma_ucm_port_space ps = 0;
3922         struct sockaddr_ib *sib;
3923         u64 sid_ps, mask, sid;
3924
3925         sib = (struct sockaddr_ib *) cma_src_addr(id_priv);
3926         mask = be64_to_cpu(sib->sib_sid_mask) & RDMA_IB_IP_PS_MASK;
3927         sid = be64_to_cpu(sib->sib_sid) & mask;
3928
3929         if ((id_priv->id.ps == RDMA_PS_IB) && (sid == (RDMA_IB_IP_PS_IB & mask))) {
3930                 sid_ps = RDMA_IB_IP_PS_IB;
3931                 ps = RDMA_PS_IB;
3932         } else if (((id_priv->id.ps == RDMA_PS_IB) || (id_priv->id.ps == RDMA_PS_TCP)) &&
3933                    (sid == (RDMA_IB_IP_PS_TCP & mask))) {
3934                 sid_ps = RDMA_IB_IP_PS_TCP;
3935                 ps = RDMA_PS_TCP;
3936         } else if (((id_priv->id.ps == RDMA_PS_IB) || (id_priv->id.ps == RDMA_PS_UDP)) &&
3937                    (sid == (RDMA_IB_IP_PS_UDP & mask))) {
3938                 sid_ps = RDMA_IB_IP_PS_UDP;
3939                 ps = RDMA_PS_UDP;
3940         }
3941
3942         if (ps) {
3943                 sib->sib_sid = cpu_to_be64(sid_ps | ntohs(cma_port((struct sockaddr *) sib)));
3944                 sib->sib_sid_mask = cpu_to_be64(RDMA_IB_IP_PS_MASK |
3945                                                 be64_to_cpu(sib->sib_sid_mask));
3946         }
3947         return ps;
3948 }
3949
3950 static int cma_get_port(struct rdma_id_private *id_priv)
3951 {
3952         enum rdma_ucm_port_space ps;
3953         int ret;
3954
3955         if (cma_family(id_priv) != AF_IB)
3956                 ps = cma_select_inet_ps(id_priv);
3957         else
3958                 ps = cma_select_ib_ps(id_priv);
3959         if (!ps)
3960                 return -EPROTONOSUPPORT;
3961
3962         mutex_lock(&lock);
3963         if (cma_any_port(cma_src_addr(id_priv)))
3964                 ret = cma_alloc_any_port(ps, id_priv);
3965         else
3966                 ret = cma_use_port(ps, id_priv);
3967         mutex_unlock(&lock);
3968
3969         return ret;
3970 }
3971
3972 static int cma_check_linklocal(struct rdma_dev_addr *dev_addr,
3973                                struct sockaddr *addr)
3974 {
3975 #if IS_ENABLED(CONFIG_IPV6)
3976         struct sockaddr_in6 *sin6;
3977
3978         if (addr->sa_family != AF_INET6)
3979                 return 0;
3980
3981         sin6 = (struct sockaddr_in6 *) addr;
3982
3983         if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
3984                 return 0;
3985
3986         if (!sin6->sin6_scope_id)
3987                         return -EINVAL;
3988
3989         dev_addr->bound_dev_if = sin6->sin6_scope_id;
3990 #endif
3991         return 0;
3992 }
3993
3994 int rdma_listen(struct rdma_cm_id *id, int backlog)
3995 {
3996         struct rdma_id_private *id_priv =
3997                 container_of(id, struct rdma_id_private, id);
3998         int ret;
3999
4000         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_LISTEN)) {
4001                 struct sockaddr_in any_in = {
4002                         .sin_family = AF_INET,
4003                         .sin_addr.s_addr = htonl(INADDR_ANY),
4004                 };
4005
4006                 /* For a well behaved ULP state will be RDMA_CM_IDLE */
4007                 ret = rdma_bind_addr(id, (struct sockaddr *)&any_in);
4008                 if (ret)
4009                         return ret;
4010                 if (WARN_ON(!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND,
4011                                            RDMA_CM_LISTEN)))
4012                         return -EINVAL;
4013         }
4014
4015         /*
4016          * Once the ID reaches RDMA_CM_LISTEN it is not allowed to be reusable
4017          * any more, and has to be unique in the bind list.
4018          */
4019         if (id_priv->reuseaddr) {
4020                 mutex_lock(&lock);
4021                 ret = cma_check_port(id_priv->bind_list, id_priv, 0);
4022                 if (!ret)
4023                         id_priv->reuseaddr = 0;
4024                 mutex_unlock(&lock);
4025                 if (ret)
4026                         goto err;
4027         }
4028
4029         id_priv->backlog = backlog;
4030         if (id_priv->cma_dev) {
4031                 if (rdma_cap_ib_cm(id->device, 1)) {
4032                         ret = cma_ib_listen(id_priv);
4033                         if (ret)
4034                                 goto err;
4035                 } else if (rdma_cap_iw_cm(id->device, 1)) {
4036                         ret = cma_iw_listen(id_priv, backlog);
4037                         if (ret)
4038                                 goto err;
4039                 } else {
4040                         ret = -ENOSYS;
4041                         goto err;
4042                 }
4043         } else {
4044                 ret = cma_listen_on_all(id_priv);
4045                 if (ret)
4046                         goto err;
4047         }
4048
4049         return 0;
4050 err:
4051         id_priv->backlog = 0;
4052         /*
4053          * All the failure paths that lead here will not allow the req_handler's
4054          * to have run.
4055          */
4056         cma_comp_exch(id_priv, RDMA_CM_LISTEN, RDMA_CM_ADDR_BOUND);
4057         return ret;
4058 }
4059 EXPORT_SYMBOL(rdma_listen);
4060
4061 int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr)
4062 {
4063         struct rdma_id_private *id_priv;
4064         int ret;
4065         struct sockaddr  *daddr;
4066
4067         if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6 &&
4068             addr->sa_family != AF_IB)
4069                 return -EAFNOSUPPORT;
4070
4071         id_priv = container_of(id, struct rdma_id_private, id);
4072         if (!cma_comp_exch(id_priv, RDMA_CM_IDLE, RDMA_CM_ADDR_BOUND))
4073                 return -EINVAL;
4074
4075         ret = cma_check_linklocal(&id->route.addr.dev_addr, addr);
4076         if (ret)
4077                 goto err1;
4078
4079         memcpy(cma_src_addr(id_priv), addr, rdma_addr_size(addr));
4080         if (!cma_any_addr(addr)) {
4081                 ret = cma_translate_addr(addr, &id->route.addr.dev_addr);
4082                 if (ret)
4083                         goto err1;
4084
4085                 ret = cma_acquire_dev_by_src_ip(id_priv);
4086                 if (ret)
4087                         goto err1;
4088         }
4089
4090         if (!(id_priv->options & (1 << CMA_OPTION_AFONLY))) {
4091                 if (addr->sa_family == AF_INET)
4092                         id_priv->afonly = 1;
4093 #if IS_ENABLED(CONFIG_IPV6)
4094                 else if (addr->sa_family == AF_INET6) {
4095                         struct net *net = id_priv->id.route.addr.dev_addr.net;
4096
4097                         id_priv->afonly = net->ipv6.sysctl.bindv6only;
4098                 }
4099 #endif
4100         }
4101         daddr = cma_dst_addr(id_priv);
4102         daddr->sa_family = addr->sa_family;
4103
4104         ret = cma_get_port(id_priv);
4105         if (ret)
4106                 goto err2;
4107
4108         if (!cma_any_addr(addr))
4109                 rdma_restrack_add(&id_priv->res);
4110         return 0;
4111 err2:
4112         if (id_priv->cma_dev)
4113                 cma_release_dev(id_priv);
4114 err1:
4115         cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_IDLE);
4116         return ret;
4117 }
4118 EXPORT_SYMBOL(rdma_bind_addr);
4119
4120 static int cma_format_hdr(void *hdr, struct rdma_id_private *id_priv)
4121 {
4122         struct cma_hdr *cma_hdr;
4123
4124         cma_hdr = hdr;
4125         cma_hdr->cma_version = CMA_VERSION;
4126         if (cma_family(id_priv) == AF_INET) {
4127                 struct sockaddr_in *src4, *dst4;
4128
4129                 src4 = (struct sockaddr_in *) cma_src_addr(id_priv);
4130                 dst4 = (struct sockaddr_in *) cma_dst_addr(id_priv);
4131
4132                 cma_set_ip_ver(cma_hdr, 4);
4133                 cma_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
4134                 cma_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
4135                 cma_hdr->port = src4->sin_port;
4136         } else if (cma_family(id_priv) == AF_INET6) {
4137                 struct sockaddr_in6 *src6, *dst6;
4138
4139                 src6 = (struct sockaddr_in6 *) cma_src_addr(id_priv);
4140                 dst6 = (struct sockaddr_in6 *) cma_dst_addr(id_priv);
4141
4142                 cma_set_ip_ver(cma_hdr, 6);
4143                 cma_hdr->src_addr.ip6 = src6->sin6_addr;
4144                 cma_hdr->dst_addr.ip6 = dst6->sin6_addr;
4145                 cma_hdr->port = src6->sin6_port;
4146         }
4147         return 0;
4148 }
4149
4150 static int cma_sidr_rep_handler(struct ib_cm_id *cm_id,
4151                                 const struct ib_cm_event *ib_event)
4152 {
4153         struct rdma_id_private *id_priv = cm_id->context;
4154         struct rdma_cm_event event = {};
4155         const struct ib_cm_sidr_rep_event_param *rep =
4156                                 &ib_event->param.sidr_rep_rcvd;
4157         int ret;
4158
4159         mutex_lock(&id_priv->handler_mutex);
4160         if (READ_ONCE(id_priv->state) != RDMA_CM_CONNECT)
4161                 goto out;
4162
4163         switch (ib_event->event) {
4164         case IB_CM_SIDR_REQ_ERROR:
4165                 event.event = RDMA_CM_EVENT_UNREACHABLE;
4166                 event.status = -ETIMEDOUT;
4167                 break;
4168         case IB_CM_SIDR_REP_RECEIVED:
4169                 event.param.ud.private_data = ib_event->private_data;
4170                 event.param.ud.private_data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
4171                 if (rep->status != IB_SIDR_SUCCESS) {
4172                         event.event = RDMA_CM_EVENT_UNREACHABLE;
4173                         event.status = ib_event->param.sidr_rep_rcvd.status;
4174                         pr_debug_ratelimited("RDMA CM: UNREACHABLE: bad SIDR reply. status %d\n",
4175                                              event.status);
4176                         break;
4177                 }
4178                 ret = cma_set_qkey(id_priv, rep->qkey);
4179                 if (ret) {
4180                         pr_debug_ratelimited("RDMA CM: ADDR_ERROR: failed to set qkey. status %d\n", ret);
4181                         event.event = RDMA_CM_EVENT_ADDR_ERROR;
4182                         event.status = ret;
4183                         break;
4184                 }
4185                 ib_init_ah_attr_from_path(id_priv->id.device,
4186                                           id_priv->id.port_num,
4187                                           id_priv->id.route.path_rec,
4188                                           &event.param.ud.ah_attr,
4189                                           rep->sgid_attr);
4190                 event.param.ud.qp_num = rep->qpn;
4191                 event.param.ud.qkey = rep->qkey;
4192                 event.event = RDMA_CM_EVENT_ESTABLISHED;
4193                 event.status = 0;
4194                 break;
4195         default:
4196                 pr_err("RDMA CMA: unexpected IB CM event: %d\n",
4197                        ib_event->event);
4198                 goto out;
4199         }
4200
4201         ret = cma_cm_event_handler(id_priv, &event);
4202
4203         rdma_destroy_ah_attr(&event.param.ud.ah_attr);
4204         if (ret) {
4205                 /* Destroy the CM ID by returning a non-zero value. */
4206                 id_priv->cm_id.ib = NULL;
4207                 destroy_id_handler_unlock(id_priv);
4208                 return ret;
4209         }
4210 out:
4211         mutex_unlock(&id_priv->handler_mutex);
4212         return 0;
4213 }
4214
4215 static int cma_resolve_ib_udp(struct rdma_id_private *id_priv,
4216                               struct rdma_conn_param *conn_param)
4217 {
4218         struct ib_cm_sidr_req_param req;
4219         struct ib_cm_id *id;
4220         void *private_data;
4221         u8 offset;
4222         int ret;
4223
4224         memset(&req, 0, sizeof req);
4225         offset = cma_user_data_offset(id_priv);
4226         if (check_add_overflow(offset, conn_param->private_data_len, &req.private_data_len))
4227                 return -EINVAL;
4228
4229         if (req.private_data_len) {
4230                 private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
4231                 if (!private_data)
4232                         return -ENOMEM;
4233         } else {
4234                 private_data = NULL;
4235         }
4236
4237         if (conn_param->private_data && conn_param->private_data_len)
4238                 memcpy(private_data + offset, conn_param->private_data,
4239                        conn_param->private_data_len);
4240
4241         if (private_data) {
4242                 ret = cma_format_hdr(private_data, id_priv);
4243                 if (ret)
4244                         goto out;
4245                 req.private_data = private_data;
4246         }
4247
4248         id = ib_create_cm_id(id_priv->id.device, cma_sidr_rep_handler,
4249                              id_priv);
4250         if (IS_ERR(id)) {
4251                 ret = PTR_ERR(id);
4252                 goto out;
4253         }
4254         id_priv->cm_id.ib = id;
4255
4256         req.path = id_priv->id.route.path_rec;
4257         req.sgid_attr = id_priv->id.route.addr.dev_addr.sgid_attr;
4258         req.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
4259         req.timeout_ms = 1 << (CMA_CM_RESPONSE_TIMEOUT - 8);
4260         req.max_cm_retries = CMA_MAX_CM_RETRIES;
4261
4262         trace_cm_send_sidr_req(id_priv);
4263         ret = ib_send_cm_sidr_req(id_priv->cm_id.ib, &req);
4264         if (ret) {
4265                 ib_destroy_cm_id(id_priv->cm_id.ib);
4266                 id_priv->cm_id.ib = NULL;
4267         }
4268 out:
4269         kfree(private_data);
4270         return ret;
4271 }
4272
4273 static int cma_connect_ib(struct rdma_id_private *id_priv,
4274                           struct rdma_conn_param *conn_param)
4275 {
4276         struct ib_cm_req_param req;
4277         struct rdma_route *route;
4278         void *private_data;
4279         struct ib_cm_id *id;
4280         u8 offset;
4281         int ret;
4282
4283         memset(&req, 0, sizeof req);
4284         offset = cma_user_data_offset(id_priv);
4285         if (check_add_overflow(offset, conn_param->private_data_len, &req.private_data_len))
4286                 return -EINVAL;
4287
4288         if (req.private_data_len) {
4289                 private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
4290                 if (!private_data)
4291                         return -ENOMEM;
4292         } else {
4293                 private_data = NULL;
4294         }
4295
4296         if (conn_param->private_data && conn_param->private_data_len)
4297                 memcpy(private_data + offset, conn_param->private_data,
4298                        conn_param->private_data_len);
4299
4300         id = ib_create_cm_id(id_priv->id.device, cma_ib_handler, id_priv);
4301         if (IS_ERR(id)) {
4302                 ret = PTR_ERR(id);
4303                 goto out;
4304         }
4305         id_priv->cm_id.ib = id;
4306
4307         route = &id_priv->id.route;
4308         if (private_data) {
4309                 ret = cma_format_hdr(private_data, id_priv);
4310                 if (ret)
4311                         goto out;
4312                 req.private_data = private_data;
4313         }
4314
4315         req.primary_path = &route->path_rec[0];
4316         req.primary_path_inbound = route->path_rec_inbound;
4317         req.primary_path_outbound = route->path_rec_outbound;
4318         if (route->num_pri_alt_paths == 2)
4319                 req.alternate_path = &route->path_rec[1];
4320
4321         req.ppath_sgid_attr = id_priv->id.route.addr.dev_addr.sgid_attr;
4322         /* Alternate path SGID attribute currently unsupported */
4323         req.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
4324         req.qp_num = id_priv->qp_num;
4325         req.qp_type = id_priv->id.qp_type;
4326         req.starting_psn = id_priv->seq_num;
4327         req.responder_resources = conn_param->responder_resources;
4328         req.initiator_depth = conn_param->initiator_depth;
4329         req.flow_control = conn_param->flow_control;
4330         req.retry_count = min_t(u8, 7, conn_param->retry_count);
4331         req.rnr_retry_count = min_t(u8, 7, conn_param->rnr_retry_count);
4332         req.remote_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
4333         req.local_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
4334         req.max_cm_retries = CMA_MAX_CM_RETRIES;
4335         req.srq = id_priv->srq ? 1 : 0;
4336         req.ece.vendor_id = id_priv->ece.vendor_id;
4337         req.ece.attr_mod = id_priv->ece.attr_mod;
4338
4339         trace_cm_send_req(id_priv);
4340         ret = ib_send_cm_req(id_priv->cm_id.ib, &req);
4341 out:
4342         if (ret && !IS_ERR(id)) {
4343                 ib_destroy_cm_id(id);
4344                 id_priv->cm_id.ib = NULL;
4345         }
4346
4347         kfree(private_data);
4348         return ret;
4349 }
4350
4351 static int cma_connect_iw(struct rdma_id_private *id_priv,
4352                           struct rdma_conn_param *conn_param)
4353 {
4354         struct iw_cm_id *cm_id;
4355         int ret;
4356         struct iw_cm_conn_param iw_param;
4357
4358         cm_id = iw_create_cm_id(id_priv->id.device, cma_iw_handler, id_priv);
4359         if (IS_ERR(cm_id))
4360                 return PTR_ERR(cm_id);
4361
4362         mutex_lock(&id_priv->qp_mutex);
4363         cm_id->tos = id_priv->tos;
4364         cm_id->tos_set = id_priv->tos_set;
4365         mutex_unlock(&id_priv->qp_mutex);
4366
4367         id_priv->cm_id.iw = cm_id;
4368
4369         memcpy(&cm_id->local_addr, cma_src_addr(id_priv),
4370                rdma_addr_size(cma_src_addr(id_priv)));
4371         memcpy(&cm_id->remote_addr, cma_dst_addr(id_priv),
4372                rdma_addr_size(cma_dst_addr(id_priv)));
4373
4374         ret = cma_modify_qp_rtr(id_priv, conn_param);
4375         if (ret)
4376                 goto out;
4377
4378         if (conn_param) {
4379                 iw_param.ord = conn_param->initiator_depth;
4380                 iw_param.ird = conn_param->responder_resources;
4381                 iw_param.private_data = conn_param->private_data;
4382                 iw_param.private_data_len = conn_param->private_data_len;
4383                 iw_param.qpn = id_priv->id.qp ? id_priv->qp_num : conn_param->qp_num;
4384         } else {
4385                 memset(&iw_param, 0, sizeof iw_param);
4386                 iw_param.qpn = id_priv->qp_num;
4387         }
4388         ret = iw_cm_connect(cm_id, &iw_param);
4389 out:
4390         if (ret) {
4391                 iw_destroy_cm_id(cm_id);
4392                 id_priv->cm_id.iw = NULL;
4393         }
4394         return ret;
4395 }
4396
4397 /**
4398  * rdma_connect_locked - Initiate an active connection request.
4399  * @id: Connection identifier to connect.
4400  * @conn_param: Connection information used for connected QPs.
4401  *
4402  * Same as rdma_connect() but can only be called from the
4403  * RDMA_CM_EVENT_ROUTE_RESOLVED handler callback.
4404  */
4405 int rdma_connect_locked(struct rdma_cm_id *id,
4406                         struct rdma_conn_param *conn_param)
4407 {
4408         struct rdma_id_private *id_priv =
4409                 container_of(id, struct rdma_id_private, id);
4410         int ret;
4411
4412         if (!cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_CONNECT))
4413                 return -EINVAL;
4414
4415         if (!id->qp) {
4416                 id_priv->qp_num = conn_param->qp_num;
4417                 id_priv->srq = conn_param->srq;
4418         }
4419
4420         if (rdma_cap_ib_cm(id->device, id->port_num)) {
4421                 if (id->qp_type == IB_QPT_UD)
4422                         ret = cma_resolve_ib_udp(id_priv, conn_param);
4423                 else
4424                         ret = cma_connect_ib(id_priv, conn_param);
4425         } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
4426                 ret = cma_connect_iw(id_priv, conn_param);
4427         } else {
4428                 ret = -ENOSYS;
4429         }
4430         if (ret)
4431                 goto err_state;
4432         return 0;
4433 err_state:
4434         cma_comp_exch(id_priv, RDMA_CM_CONNECT, RDMA_CM_ROUTE_RESOLVED);
4435         return ret;
4436 }
4437 EXPORT_SYMBOL(rdma_connect_locked);
4438
4439 /**
4440  * rdma_connect - Initiate an active connection request.
4441  * @id: Connection identifier to connect.
4442  * @conn_param: Connection information used for connected QPs.
4443  *
4444  * Users must have resolved a route for the rdma_cm_id to connect with by having
4445  * called rdma_resolve_route before calling this routine.
4446  *
4447  * This call will either connect to a remote QP or obtain remote QP information
4448  * for unconnected rdma_cm_id's.  The actual operation is based on the
4449  * rdma_cm_id's port space.
4450  */
4451 int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
4452 {
4453         struct rdma_id_private *id_priv =
4454                 container_of(id, struct rdma_id_private, id);
4455         int ret;
4456
4457         mutex_lock(&id_priv->handler_mutex);
4458         ret = rdma_connect_locked(id, conn_param);
4459         mutex_unlock(&id_priv->handler_mutex);
4460         return ret;
4461 }
4462 EXPORT_SYMBOL(rdma_connect);
4463
4464 /**
4465  * rdma_connect_ece - Initiate an active connection request with ECE data.
4466  * @id: Connection identifier to connect.
4467  * @conn_param: Connection information used for connected QPs.
4468  * @ece: ECE parameters
4469  *
4470  * See rdma_connect() explanation.
4471  */
4472 int rdma_connect_ece(struct rdma_cm_id *id, struct rdma_conn_param *conn_param,
4473                      struct rdma_ucm_ece *ece)
4474 {
4475         struct rdma_id_private *id_priv =
4476                 container_of(id, struct rdma_id_private, id);
4477
4478         id_priv->ece.vendor_id = ece->vendor_id;
4479         id_priv->ece.attr_mod = ece->attr_mod;
4480
4481         return rdma_connect(id, conn_param);
4482 }
4483 EXPORT_SYMBOL(rdma_connect_ece);
4484
4485 static int cma_accept_ib(struct rdma_id_private *id_priv,
4486                          struct rdma_conn_param *conn_param)
4487 {
4488         struct ib_cm_rep_param rep;
4489         int ret;
4490
4491         ret = cma_modify_qp_rtr(id_priv, conn_param);
4492         if (ret)
4493                 goto out;
4494
4495         ret = cma_modify_qp_rts(id_priv, conn_param);
4496         if (ret)
4497                 goto out;
4498
4499         memset(&rep, 0, sizeof rep);
4500         rep.qp_num = id_priv->qp_num;
4501         rep.starting_psn = id_priv->seq_num;
4502         rep.private_data = conn_param->private_data;
4503         rep.private_data_len = conn_param->private_data_len;
4504         rep.responder_resources = conn_param->responder_resources;
4505         rep.initiator_depth = conn_param->initiator_depth;
4506         rep.failover_accepted = 0;
4507         rep.flow_control = conn_param->flow_control;
4508         rep.rnr_retry_count = min_t(u8, 7, conn_param->rnr_retry_count);
4509         rep.srq = id_priv->srq ? 1 : 0;
4510         rep.ece.vendor_id = id_priv->ece.vendor_id;
4511         rep.ece.attr_mod = id_priv->ece.attr_mod;
4512
4513         trace_cm_send_rep(id_priv);
4514         ret = ib_send_cm_rep(id_priv->cm_id.ib, &rep);
4515 out:
4516         return ret;
4517 }
4518
4519 static int cma_accept_iw(struct rdma_id_private *id_priv,
4520                   struct rdma_conn_param *conn_param)
4521 {
4522         struct iw_cm_conn_param iw_param;
4523         int ret;
4524
4525         if (!conn_param)
4526                 return -EINVAL;
4527
4528         ret = cma_modify_qp_rtr(id_priv, conn_param);
4529         if (ret)
4530                 return ret;
4531
4532         iw_param.ord = conn_param->initiator_depth;
4533         iw_param.ird = conn_param->responder_resources;
4534         iw_param.private_data = conn_param->private_data;
4535         iw_param.private_data_len = conn_param->private_data_len;
4536         if (id_priv->id.qp)
4537                 iw_param.qpn = id_priv->qp_num;
4538         else
4539                 iw_param.qpn = conn_param->qp_num;
4540
4541         return iw_cm_accept(id_priv->cm_id.iw, &iw_param);
4542 }
4543
4544 static int cma_send_sidr_rep(struct rdma_id_private *id_priv,
4545                              enum ib_cm_sidr_status status, u32 qkey,
4546                              const void *private_data, int private_data_len)
4547 {
4548         struct ib_cm_sidr_rep_param rep;
4549         int ret;
4550
4551         memset(&rep, 0, sizeof rep);
4552         rep.status = status;
4553         if (status == IB_SIDR_SUCCESS) {
4554                 ret = cma_set_qkey(id_priv, qkey);
4555                 if (ret)
4556                         return ret;
4557                 rep.qp_num = id_priv->qp_num;
4558                 rep.qkey = id_priv->qkey;
4559
4560                 rep.ece.vendor_id = id_priv->ece.vendor_id;
4561                 rep.ece.attr_mod = id_priv->ece.attr_mod;
4562         }
4563
4564         rep.private_data = private_data;
4565         rep.private_data_len = private_data_len;
4566
4567         trace_cm_send_sidr_rep(id_priv);
4568         return ib_send_cm_sidr_rep(id_priv->cm_id.ib, &rep);
4569 }
4570
4571 /**
4572  * rdma_accept - Called to accept a connection request or response.
4573  * @id: Connection identifier associated with the request.
4574  * @conn_param: Information needed to establish the connection.  This must be
4575  *   provided if accepting a connection request.  If accepting a connection
4576  *   response, this parameter must be NULL.
4577  *
4578  * Typically, this routine is only called by the listener to accept a connection
4579  * request.  It must also be called on the active side of a connection if the
4580  * user is performing their own QP transitions.
4581  *
4582  * In the case of error, a reject message is sent to the remote side and the
4583  * state of the qp associated with the id is modified to error, such that any
4584  * previously posted receive buffers would be flushed.
4585  *
4586  * This function is for use by kernel ULPs and must be called from under the
4587  * handler callback.
4588  */
4589 int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
4590 {
4591         struct rdma_id_private *id_priv =
4592                 container_of(id, struct rdma_id_private, id);
4593         int ret;
4594
4595         lockdep_assert_held(&id_priv->handler_mutex);
4596
4597         if (READ_ONCE(id_priv->state) != RDMA_CM_CONNECT)
4598                 return -EINVAL;
4599
4600         if (!id->qp && conn_param) {
4601                 id_priv->qp_num = conn_param->qp_num;
4602                 id_priv->srq = conn_param->srq;
4603         }
4604
4605         if (rdma_cap_ib_cm(id->device, id->port_num)) {
4606                 if (id->qp_type == IB_QPT_UD) {
4607                         if (conn_param)
4608                                 ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
4609                                                         conn_param->qkey,
4610                                                         conn_param->private_data,
4611                                                         conn_param->private_data_len);
4612                         else
4613                                 ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
4614                                                         0, NULL, 0);
4615                 } else {
4616                         if (conn_param)
4617                                 ret = cma_accept_ib(id_priv, conn_param);
4618                         else
4619                                 ret = cma_rep_recv(id_priv);
4620                 }
4621         } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
4622                 ret = cma_accept_iw(id_priv, conn_param);
4623         } else {
4624                 ret = -ENOSYS;
4625         }
4626         if (ret)
4627                 goto reject;
4628
4629         return 0;
4630 reject:
4631         cma_modify_qp_err(id_priv);
4632         rdma_reject(id, NULL, 0, IB_CM_REJ_CONSUMER_DEFINED);
4633         return ret;
4634 }
4635 EXPORT_SYMBOL(rdma_accept);
4636
4637 int rdma_accept_ece(struct rdma_cm_id *id, struct rdma_conn_param *conn_param,
4638                     struct rdma_ucm_ece *ece)
4639 {
4640         struct rdma_id_private *id_priv =
4641                 container_of(id, struct rdma_id_private, id);
4642
4643         id_priv->ece.vendor_id = ece->vendor_id;
4644         id_priv->ece.attr_mod = ece->attr_mod;
4645
4646         return rdma_accept(id, conn_param);
4647 }
4648 EXPORT_SYMBOL(rdma_accept_ece);
4649
4650 void rdma_lock_handler(struct rdma_cm_id *id)
4651 {
4652         struct rdma_id_private *id_priv =
4653                 container_of(id, struct rdma_id_private, id);
4654
4655         mutex_lock(&id_priv->handler_mutex);
4656 }
4657 EXPORT_SYMBOL(rdma_lock_handler);
4658
4659 void rdma_unlock_handler(struct rdma_cm_id *id)
4660 {
4661         struct rdma_id_private *id_priv =
4662                 container_of(id, struct rdma_id_private, id);
4663
4664         mutex_unlock(&id_priv->handler_mutex);
4665 }
4666 EXPORT_SYMBOL(rdma_unlock_handler);
4667
4668 int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event)
4669 {
4670         struct rdma_id_private *id_priv;
4671         int ret;
4672
4673         id_priv = container_of(id, struct rdma_id_private, id);
4674         if (!id_priv->cm_id.ib)
4675                 return -EINVAL;
4676
4677         switch (id->device->node_type) {
4678         case RDMA_NODE_IB_CA:
4679                 ret = ib_cm_notify(id_priv->cm_id.ib, event);
4680                 break;
4681         default:
4682                 ret = 0;
4683                 break;
4684         }
4685         return ret;
4686 }
4687 EXPORT_SYMBOL(rdma_notify);
4688
4689 int rdma_reject(struct rdma_cm_id *id, const void *private_data,
4690                 u8 private_data_len, u8 reason)
4691 {
4692         struct rdma_id_private *id_priv;
4693         int ret;
4694
4695         id_priv = container_of(id, struct rdma_id_private, id);
4696         if (!id_priv->cm_id.ib)
4697                 return -EINVAL;
4698
4699         if (rdma_cap_ib_cm(id->device, id->port_num)) {
4700                 if (id->qp_type == IB_QPT_UD) {
4701                         ret = cma_send_sidr_rep(id_priv, IB_SIDR_REJECT, 0,
4702                                                 private_data, private_data_len);
4703                 } else {
4704                         trace_cm_send_rej(id_priv);
4705                         ret = ib_send_cm_rej(id_priv->cm_id.ib, reason, NULL, 0,
4706                                              private_data, private_data_len);
4707                 }
4708         } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
4709                 ret = iw_cm_reject(id_priv->cm_id.iw,
4710                                    private_data, private_data_len);
4711         } else {
4712                 ret = -ENOSYS;
4713         }
4714
4715         return ret;
4716 }
4717 EXPORT_SYMBOL(rdma_reject);
4718
4719 int rdma_disconnect(struct rdma_cm_id *id)
4720 {
4721         struct rdma_id_private *id_priv;
4722         int ret;
4723
4724         id_priv = container_of(id, struct rdma_id_private, id);
4725         if (!id_priv->cm_id.ib)
4726                 return -EINVAL;
4727
4728         if (rdma_cap_ib_cm(id->device, id->port_num)) {
4729                 ret = cma_modify_qp_err(id_priv);
4730                 if (ret)
4731                         goto out;
4732                 /* Initiate or respond to a disconnect. */
4733                 trace_cm_disconnect(id_priv);
4734                 if (ib_send_cm_dreq(id_priv->cm_id.ib, NULL, 0)) {
4735                         if (!ib_send_cm_drep(id_priv->cm_id.ib, NULL, 0))
4736                                 trace_cm_sent_drep(id_priv);
4737                 } else {
4738                         trace_cm_sent_dreq(id_priv);
4739                 }
4740         } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
4741                 ret = iw_cm_disconnect(id_priv->cm_id.iw, 0);
4742         } else
4743                 ret = -EINVAL;
4744
4745 out:
4746         return ret;
4747 }
4748 EXPORT_SYMBOL(rdma_disconnect);
4749
4750 static void cma_make_mc_event(int status, struct rdma_id_private *id_priv,
4751                               struct ib_sa_multicast *multicast,
4752                               struct rdma_cm_event *event,
4753                               struct cma_multicast *mc)
4754 {
4755         struct rdma_dev_addr *dev_addr;
4756         enum ib_gid_type gid_type;
4757         struct net_device *ndev;
4758
4759         if (!status)
4760                 status = cma_set_qkey(id_priv, be32_to_cpu(multicast->rec.qkey));
4761         else
4762                 pr_debug_ratelimited("RDMA CM: MULTICAST_ERROR: failed to join multicast. status %d\n",
4763                                      status);
4764
4765         event->status = status;
4766         event->param.ud.private_data = mc->context;
4767         if (status) {
4768                 event->event = RDMA_CM_EVENT_MULTICAST_ERROR;
4769                 return;
4770         }
4771
4772         dev_addr = &id_priv->id.route.addr.dev_addr;
4773         ndev = dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if);
4774         gid_type =
4775                 id_priv->cma_dev
4776                         ->default_gid_type[id_priv->id.port_num -
4777                                            rdma_start_port(
4778                                                    id_priv->cma_dev->device)];
4779
4780         event->event = RDMA_CM_EVENT_MULTICAST_JOIN;
4781         if (ib_init_ah_from_mcmember(id_priv->id.device, id_priv->id.port_num,
4782                                      &multicast->rec, ndev, gid_type,
4783                                      &event->param.ud.ah_attr)) {
4784                 event->event = RDMA_CM_EVENT_MULTICAST_ERROR;
4785                 goto out;
4786         }
4787
4788         event->param.ud.qp_num = 0xFFFFFF;
4789         event->param.ud.qkey = be32_to_cpu(multicast->rec.qkey);
4790
4791 out:
4792         if (ndev)
4793                 dev_put(ndev);
4794 }
4795
4796 static int cma_ib_mc_handler(int status, struct ib_sa_multicast *multicast)
4797 {
4798         struct cma_multicast *mc = multicast->context;
4799         struct rdma_id_private *id_priv = mc->id_priv;
4800         struct rdma_cm_event event = {};
4801         int ret = 0;
4802
4803         mutex_lock(&id_priv->handler_mutex);
4804         if (READ_ONCE(id_priv->state) == RDMA_CM_DEVICE_REMOVAL ||
4805             READ_ONCE(id_priv->state) == RDMA_CM_DESTROYING)
4806                 goto out;
4807
4808         cma_make_mc_event(status, id_priv, multicast, &event, mc);
4809         ret = cma_cm_event_handler(id_priv, &event);
4810         rdma_destroy_ah_attr(&event.param.ud.ah_attr);
4811         WARN_ON(ret);
4812
4813 out:
4814         mutex_unlock(&id_priv->handler_mutex);
4815         return 0;
4816 }
4817
4818 static void cma_set_mgid(struct rdma_id_private *id_priv,
4819                          struct sockaddr *addr, union ib_gid *mgid)
4820 {
4821         unsigned char mc_map[MAX_ADDR_LEN];
4822         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
4823         struct sockaddr_in *sin = (struct sockaddr_in *) addr;
4824         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) addr;
4825
4826         if (cma_any_addr(addr)) {
4827                 memset(mgid, 0, sizeof *mgid);
4828         } else if ((addr->sa_family == AF_INET6) &&
4829                    ((be32_to_cpu(sin6->sin6_addr.s6_addr32[0]) & 0xFFF0FFFF) ==
4830                                                                  0xFF10A01B)) {
4831                 /* IPv6 address is an SA assigned MGID. */
4832                 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
4833         } else if (addr->sa_family == AF_IB) {
4834                 memcpy(mgid, &((struct sockaddr_ib *) addr)->sib_addr, sizeof *mgid);
4835         } else if (addr->sa_family == AF_INET6) {
4836                 ipv6_ib_mc_map(&sin6->sin6_addr, dev_addr->broadcast, mc_map);
4837                 if (id_priv->id.ps == RDMA_PS_UDP)
4838                         mc_map[7] = 0x01;       /* Use RDMA CM signature */
4839                 *mgid = *(union ib_gid *) (mc_map + 4);
4840         } else {
4841                 ip_ib_mc_map(sin->sin_addr.s_addr, dev_addr->broadcast, mc_map);
4842                 if (id_priv->id.ps == RDMA_PS_UDP)
4843                         mc_map[7] = 0x01;       /* Use RDMA CM signature */
4844                 *mgid = *(union ib_gid *) (mc_map + 4);
4845         }
4846 }
4847
4848 static int cma_join_ib_multicast(struct rdma_id_private *id_priv,
4849                                  struct cma_multicast *mc)
4850 {
4851         struct ib_sa_mcmember_rec rec;
4852         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
4853         ib_sa_comp_mask comp_mask;
4854         int ret;
4855
4856         ib_addr_get_mgid(dev_addr, &rec.mgid);
4857         ret = ib_sa_get_mcmember_rec(id_priv->id.device, id_priv->id.port_num,
4858                                      &rec.mgid, &rec);
4859         if (ret)
4860                 return ret;
4861
4862         ret = cma_set_qkey(id_priv, 0);
4863         if (ret)
4864                 return ret;
4865
4866         cma_set_mgid(id_priv, (struct sockaddr *) &mc->addr, &rec.mgid);
4867         rec.qkey = cpu_to_be32(id_priv->qkey);
4868         rdma_addr_get_sgid(dev_addr, &rec.port_gid);
4869         rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
4870         rec.join_state = mc->join_state;
4871
4872         comp_mask = IB_SA_MCMEMBER_REC_MGID | IB_SA_MCMEMBER_REC_PORT_GID |
4873                     IB_SA_MCMEMBER_REC_PKEY | IB_SA_MCMEMBER_REC_JOIN_STATE |
4874                     IB_SA_MCMEMBER_REC_QKEY | IB_SA_MCMEMBER_REC_SL |
4875                     IB_SA_MCMEMBER_REC_FLOW_LABEL |
4876                     IB_SA_MCMEMBER_REC_TRAFFIC_CLASS;
4877
4878         if (id_priv->id.ps == RDMA_PS_IPOIB)
4879                 comp_mask |= IB_SA_MCMEMBER_REC_RATE |
4880                              IB_SA_MCMEMBER_REC_RATE_SELECTOR |
4881                              IB_SA_MCMEMBER_REC_MTU_SELECTOR |
4882                              IB_SA_MCMEMBER_REC_MTU |
4883                              IB_SA_MCMEMBER_REC_HOP_LIMIT;
4884
4885         mc->sa_mc = ib_sa_join_multicast(&sa_client, id_priv->id.device,
4886                                          id_priv->id.port_num, &rec, comp_mask,
4887                                          GFP_KERNEL, cma_ib_mc_handler, mc);
4888         return PTR_ERR_OR_ZERO(mc->sa_mc);
4889 }
4890
4891 static void cma_iboe_set_mgid(struct sockaddr *addr, union ib_gid *mgid,
4892                               enum ib_gid_type gid_type)
4893 {
4894         struct sockaddr_in *sin = (struct sockaddr_in *)addr;
4895         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr;
4896
4897         if (cma_any_addr(addr)) {
4898                 memset(mgid, 0, sizeof *mgid);
4899         } else if (addr->sa_family == AF_INET6) {
4900                 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
4901         } else {
4902                 mgid->raw[0] =
4903                         (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) ? 0 : 0xff;
4904                 mgid->raw[1] =
4905                         (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) ? 0 : 0x0e;
4906                 mgid->raw[2] = 0;
4907                 mgid->raw[3] = 0;
4908                 mgid->raw[4] = 0;
4909                 mgid->raw[5] = 0;
4910                 mgid->raw[6] = 0;
4911                 mgid->raw[7] = 0;
4912                 mgid->raw[8] = 0;
4913                 mgid->raw[9] = 0;
4914                 mgid->raw[10] = 0xff;
4915                 mgid->raw[11] = 0xff;
4916                 *(__be32 *)(&mgid->raw[12]) = sin->sin_addr.s_addr;
4917         }
4918 }
4919
4920 static int cma_iboe_join_multicast(struct rdma_id_private *id_priv,
4921                                    struct cma_multicast *mc)
4922 {
4923         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
4924         int err = 0;
4925         struct sockaddr *addr = (struct sockaddr *)&mc->addr;
4926         struct net_device *ndev = NULL;
4927         struct ib_sa_multicast ib;
4928         enum ib_gid_type gid_type;
4929         bool send_only;
4930
4931         send_only = mc->join_state == BIT(SENDONLY_FULLMEMBER_JOIN);
4932
4933         if (cma_zero_addr(addr))
4934                 return -EINVAL;
4935
4936         gid_type = id_priv->cma_dev->default_gid_type[id_priv->id.port_num -
4937                    rdma_start_port(id_priv->cma_dev->device)];
4938         cma_iboe_set_mgid(addr, &ib.rec.mgid, gid_type);
4939
4940         ib.rec.pkey = cpu_to_be16(0xffff);
4941         if (id_priv->id.ps == RDMA_PS_UDP)
4942                 ib.rec.qkey = cpu_to_be32(RDMA_UDP_QKEY);
4943
4944         if (dev_addr->bound_dev_if)
4945                 ndev = dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if);
4946         if (!ndev)
4947                 return -ENODEV;
4948
4949         ib.rec.rate = iboe_get_rate(ndev);
4950         ib.rec.hop_limit = 1;
4951         ib.rec.mtu = iboe_get_mtu(ndev->mtu);
4952
4953         if (addr->sa_family == AF_INET) {
4954                 if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) {
4955                         ib.rec.hop_limit = IPV6_DEFAULT_HOPLIMIT;
4956                         if (!send_only) {
4957                                 err = cma_igmp_send(ndev, &ib.rec.mgid,
4958                                                     true);
4959                         }
4960                 }
4961         } else {
4962                 if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP)
4963                         err = -ENOTSUPP;
4964         }
4965         dev_put(ndev);
4966         if (err || !ib.rec.mtu)
4967                 return err ?: -EINVAL;
4968
4969         rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
4970                     &ib.rec.port_gid);
4971         INIT_WORK(&mc->iboe_join.work, cma_iboe_join_work_handler);
4972         cma_make_mc_event(0, id_priv, &ib, &mc->iboe_join.event, mc);
4973         queue_work(cma_wq, &mc->iboe_join.work);
4974         return 0;
4975 }
4976
4977 int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
4978                         u8 join_state, void *context)
4979 {
4980         struct rdma_id_private *id_priv =
4981                 container_of(id, struct rdma_id_private, id);
4982         struct cma_multicast *mc;
4983         int ret;
4984
4985         /* Not supported for kernel QPs */
4986         if (WARN_ON(id->qp))
4987                 return -EINVAL;
4988
4989         /* ULP is calling this wrong. */
4990         if (!id->device || (READ_ONCE(id_priv->state) != RDMA_CM_ADDR_BOUND &&
4991                             READ_ONCE(id_priv->state) != RDMA_CM_ADDR_RESOLVED))
4992                 return -EINVAL;
4993
4994         mc = kzalloc(sizeof(*mc), GFP_KERNEL);
4995         if (!mc)
4996                 return -ENOMEM;
4997
4998         memcpy(&mc->addr, addr, rdma_addr_size(addr));
4999         mc->context = context;
5000         mc->id_priv = id_priv;
5001         mc->join_state = join_state;
5002
5003         if (rdma_protocol_roce(id->device, id->port_num)) {
5004                 ret = cma_iboe_join_multicast(id_priv, mc);
5005                 if (ret)
5006                         goto out_err;
5007         } else if (rdma_cap_ib_mcast(id->device, id->port_num)) {
5008                 ret = cma_join_ib_multicast(id_priv, mc);
5009                 if (ret)
5010                         goto out_err;
5011         } else {
5012                 ret = -ENOSYS;
5013                 goto out_err;
5014         }
5015
5016         spin_lock(&id_priv->lock);
5017         list_add(&mc->list, &id_priv->mc_list);
5018         spin_unlock(&id_priv->lock);
5019
5020         return 0;
5021 out_err:
5022         kfree(mc);
5023         return ret;
5024 }
5025 EXPORT_SYMBOL(rdma_join_multicast);
5026
5027 void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr)
5028 {
5029         struct rdma_id_private *id_priv;
5030         struct cma_multicast *mc;
5031
5032         id_priv = container_of(id, struct rdma_id_private, id);
5033         spin_lock_irq(&id_priv->lock);
5034         list_for_each_entry(mc, &id_priv->mc_list, list) {
5035                 if (memcmp(&mc->addr, addr, rdma_addr_size(addr)) != 0)
5036                         continue;
5037                 list_del(&mc->list);
5038                 spin_unlock_irq(&id_priv->lock);
5039
5040                 WARN_ON(id_priv->cma_dev->device != id->device);
5041                 destroy_mc(id_priv, mc);
5042                 return;
5043         }
5044         spin_unlock_irq(&id_priv->lock);
5045 }
5046 EXPORT_SYMBOL(rdma_leave_multicast);
5047
5048 static int cma_netdev_change(struct net_device *ndev, struct rdma_id_private *id_priv)
5049 {
5050         struct rdma_dev_addr *dev_addr;
5051         struct cma_work *work;
5052
5053         dev_addr = &id_priv->id.route.addr.dev_addr;
5054
5055         if ((dev_addr->bound_dev_if == ndev->ifindex) &&
5056             (net_eq(dev_net(ndev), dev_addr->net)) &&
5057             memcmp(dev_addr->src_dev_addr, ndev->dev_addr, ndev->addr_len)) {
5058                 pr_info("RDMA CM addr change for ndev %s used by id %p\n",
5059                         ndev->name, &id_priv->id);
5060                 work = kzalloc(sizeof *work, GFP_KERNEL);
5061                 if (!work)
5062                         return -ENOMEM;
5063
5064                 INIT_WORK(&work->work, cma_work_handler);
5065                 work->id = id_priv;
5066                 work->event.event = RDMA_CM_EVENT_ADDR_CHANGE;
5067                 cma_id_get(id_priv);
5068                 queue_work(cma_wq, &work->work);
5069         }
5070
5071         return 0;
5072 }
5073
5074 static int cma_netdev_callback(struct notifier_block *self, unsigned long event,
5075                                void *ptr)
5076 {
5077         struct net_device *ndev = netdev_notifier_info_to_dev(ptr);
5078         struct cma_device *cma_dev;
5079         struct rdma_id_private *id_priv;
5080         int ret = NOTIFY_DONE;
5081
5082         if (event != NETDEV_BONDING_FAILOVER)
5083                 return NOTIFY_DONE;
5084
5085         if (!netif_is_bond_master(ndev))
5086                 return NOTIFY_DONE;
5087
5088         mutex_lock(&lock);
5089         list_for_each_entry(cma_dev, &dev_list, list)
5090                 list_for_each_entry(id_priv, &cma_dev->id_list, device_item) {
5091                         ret = cma_netdev_change(ndev, id_priv);
5092                         if (ret)
5093                                 goto out;
5094                 }
5095
5096 out:
5097         mutex_unlock(&lock);
5098         return ret;
5099 }
5100
5101 static void cma_netevent_work_handler(struct work_struct *_work)
5102 {
5103         struct rdma_id_private *id_priv =
5104                 container_of(_work, struct rdma_id_private, id.net_work);
5105         struct rdma_cm_event event = {};
5106
5107         mutex_lock(&id_priv->handler_mutex);
5108
5109         if (READ_ONCE(id_priv->state) == RDMA_CM_DESTROYING ||
5110             READ_ONCE(id_priv->state) == RDMA_CM_DEVICE_REMOVAL)
5111                 goto out_unlock;
5112
5113         event.event = RDMA_CM_EVENT_UNREACHABLE;
5114         event.status = -ETIMEDOUT;
5115
5116         if (cma_cm_event_handler(id_priv, &event)) {
5117                 __acquire(&id_priv->handler_mutex);
5118                 id_priv->cm_id.ib = NULL;
5119                 cma_id_put(id_priv);
5120                 destroy_id_handler_unlock(id_priv);
5121                 return;
5122         }
5123
5124 out_unlock:
5125         mutex_unlock(&id_priv->handler_mutex);
5126         cma_id_put(id_priv);
5127 }
5128
5129 static int cma_netevent_callback(struct notifier_block *self,
5130                                  unsigned long event, void *ctx)
5131 {
5132         struct id_table_entry *ips_node = NULL;
5133         struct rdma_id_private *current_id;
5134         struct neighbour *neigh = ctx;
5135         unsigned long flags;
5136
5137         if (event != NETEVENT_NEIGH_UPDATE)
5138                 return NOTIFY_DONE;
5139
5140         spin_lock_irqsave(&id_table_lock, flags);
5141         if (neigh->tbl->family == AF_INET6) {
5142                 struct sockaddr_in6 neigh_sock_6;
5143
5144                 neigh_sock_6.sin6_family = AF_INET6;
5145                 neigh_sock_6.sin6_addr = *(struct in6_addr *)neigh->primary_key;
5146                 ips_node = node_from_ndev_ip(&id_table, neigh->dev->ifindex,
5147                                              (struct sockaddr *)&neigh_sock_6);
5148         } else if (neigh->tbl->family == AF_INET) {
5149                 struct sockaddr_in neigh_sock_4;
5150
5151                 neigh_sock_4.sin_family = AF_INET;
5152                 neigh_sock_4.sin_addr.s_addr = *(__be32 *)(neigh->primary_key);
5153                 ips_node = node_from_ndev_ip(&id_table, neigh->dev->ifindex,
5154                                              (struct sockaddr *)&neigh_sock_4);
5155         } else
5156                 goto out;
5157
5158         if (!ips_node)
5159                 goto out;
5160
5161         list_for_each_entry(current_id, &ips_node->id_list, id_list_entry) {
5162                 if (!memcmp(current_id->id.route.addr.dev_addr.dst_dev_addr,
5163                            neigh->ha, ETH_ALEN))
5164                         continue;
5165                 INIT_WORK(&current_id->id.net_work, cma_netevent_work_handler);
5166                 cma_id_get(current_id);
5167                 queue_work(cma_wq, &current_id->id.net_work);
5168         }
5169 out:
5170         spin_unlock_irqrestore(&id_table_lock, flags);
5171         return NOTIFY_DONE;
5172 }
5173
5174 static struct notifier_block cma_nb = {
5175         .notifier_call = cma_netdev_callback
5176 };
5177
5178 static struct notifier_block cma_netevent_cb = {
5179         .notifier_call = cma_netevent_callback
5180 };
5181
5182 static void cma_send_device_removal_put(struct rdma_id_private *id_priv)
5183 {
5184         struct rdma_cm_event event = { .event = RDMA_CM_EVENT_DEVICE_REMOVAL };
5185         enum rdma_cm_state state;
5186         unsigned long flags;
5187
5188         mutex_lock(&id_priv->handler_mutex);
5189         /* Record that we want to remove the device */
5190         spin_lock_irqsave(&id_priv->lock, flags);
5191         state = id_priv->state;
5192         if (state == RDMA_CM_DESTROYING || state == RDMA_CM_DEVICE_REMOVAL) {
5193                 spin_unlock_irqrestore(&id_priv->lock, flags);
5194                 mutex_unlock(&id_priv->handler_mutex);
5195                 cma_id_put(id_priv);
5196                 return;
5197         }
5198         id_priv->state = RDMA_CM_DEVICE_REMOVAL;
5199         spin_unlock_irqrestore(&id_priv->lock, flags);
5200
5201         if (cma_cm_event_handler(id_priv, &event)) {
5202                 /*
5203                  * At this point the ULP promises it won't call
5204                  * rdma_destroy_id() concurrently
5205                  */
5206                 cma_id_put(id_priv);
5207                 mutex_unlock(&id_priv->handler_mutex);
5208                 trace_cm_id_destroy(id_priv);
5209                 _destroy_id(id_priv, state);
5210                 return;
5211         }
5212         mutex_unlock(&id_priv->handler_mutex);
5213
5214         /*
5215          * If this races with destroy then the thread that first assigns state
5216          * to a destroying does the cancel.
5217          */
5218         cma_cancel_operation(id_priv, state);
5219         cma_id_put(id_priv);
5220 }
5221
5222 static void cma_process_remove(struct cma_device *cma_dev)
5223 {
5224         mutex_lock(&lock);
5225         while (!list_empty(&cma_dev->id_list)) {
5226                 struct rdma_id_private *id_priv = list_first_entry(
5227                         &cma_dev->id_list, struct rdma_id_private, device_item);
5228
5229                 list_del_init(&id_priv->listen_item);
5230                 list_del_init(&id_priv->device_item);
5231                 cma_id_get(id_priv);
5232                 mutex_unlock(&lock);
5233
5234                 cma_send_device_removal_put(id_priv);
5235
5236                 mutex_lock(&lock);
5237         }
5238         mutex_unlock(&lock);
5239
5240         cma_dev_put(cma_dev);
5241         wait_for_completion(&cma_dev->comp);
5242 }
5243
5244 static bool cma_supported(struct ib_device *device)
5245 {
5246         u32 i;
5247
5248         rdma_for_each_port(device, i) {
5249                 if (rdma_cap_ib_cm(device, i) || rdma_cap_iw_cm(device, i))
5250                         return true;
5251         }
5252         return false;
5253 }
5254
5255 static int cma_add_one(struct ib_device *device)
5256 {
5257         struct rdma_id_private *to_destroy;
5258         struct cma_device *cma_dev;
5259         struct rdma_id_private *id_priv;
5260         unsigned long supported_gids = 0;
5261         int ret;
5262         u32 i;
5263
5264         if (!cma_supported(device))
5265                 return -EOPNOTSUPP;
5266
5267         cma_dev = kmalloc(sizeof(*cma_dev), GFP_KERNEL);
5268         if (!cma_dev)
5269                 return -ENOMEM;
5270
5271         cma_dev->device = device;
5272         cma_dev->default_gid_type = kcalloc(device->phys_port_cnt,
5273                                             sizeof(*cma_dev->default_gid_type),
5274                                             GFP_KERNEL);
5275         if (!cma_dev->default_gid_type) {
5276                 ret = -ENOMEM;
5277                 goto free_cma_dev;
5278         }
5279
5280         cma_dev->default_roce_tos = kcalloc(device->phys_port_cnt,
5281                                             sizeof(*cma_dev->default_roce_tos),
5282                                             GFP_KERNEL);
5283         if (!cma_dev->default_roce_tos) {
5284                 ret = -ENOMEM;
5285                 goto free_gid_type;
5286         }
5287
5288         rdma_for_each_port (device, i) {
5289                 supported_gids = roce_gid_type_mask_support(device, i);
5290                 WARN_ON(!supported_gids);
5291                 if (supported_gids & (1 << CMA_PREFERRED_ROCE_GID_TYPE))
5292                         cma_dev->default_gid_type[i - rdma_start_port(device)] =
5293                                 CMA_PREFERRED_ROCE_GID_TYPE;
5294                 else
5295                         cma_dev->default_gid_type[i - rdma_start_port(device)] =
5296                                 find_first_bit(&supported_gids, BITS_PER_LONG);
5297                 cma_dev->default_roce_tos[i - rdma_start_port(device)] = 0;
5298         }
5299
5300         init_completion(&cma_dev->comp);
5301         refcount_set(&cma_dev->refcount, 1);
5302         INIT_LIST_HEAD(&cma_dev->id_list);
5303         ib_set_client_data(device, &cma_client, cma_dev);
5304
5305         mutex_lock(&lock);
5306         list_add_tail(&cma_dev->list, &dev_list);
5307         list_for_each_entry(id_priv, &listen_any_list, listen_any_item) {
5308                 ret = cma_listen_on_dev(id_priv, cma_dev, &to_destroy);
5309                 if (ret)
5310                         goto free_listen;
5311         }
5312         mutex_unlock(&lock);
5313
5314         trace_cm_add_one(device);
5315         return 0;
5316
5317 free_listen:
5318         list_del(&cma_dev->list);
5319         mutex_unlock(&lock);
5320
5321         /* cma_process_remove() will delete to_destroy */
5322         cma_process_remove(cma_dev);
5323         kfree(cma_dev->default_roce_tos);
5324 free_gid_type:
5325         kfree(cma_dev->default_gid_type);
5326
5327 free_cma_dev:
5328         kfree(cma_dev);
5329         return ret;
5330 }
5331
5332 static void cma_remove_one(struct ib_device *device, void *client_data)
5333 {
5334         struct cma_device *cma_dev = client_data;
5335
5336         trace_cm_remove_one(device);
5337
5338         mutex_lock(&lock);
5339         list_del(&cma_dev->list);
5340         mutex_unlock(&lock);
5341
5342         cma_process_remove(cma_dev);
5343         kfree(cma_dev->default_roce_tos);
5344         kfree(cma_dev->default_gid_type);
5345         kfree(cma_dev);
5346 }
5347
5348 static int cma_init_net(struct net *net)
5349 {
5350         struct cma_pernet *pernet = cma_pernet(net);
5351
5352         xa_init(&pernet->tcp_ps);
5353         xa_init(&pernet->udp_ps);
5354         xa_init(&pernet->ipoib_ps);
5355         xa_init(&pernet->ib_ps);
5356
5357         return 0;
5358 }
5359
5360 static void cma_exit_net(struct net *net)
5361 {
5362         struct cma_pernet *pernet = cma_pernet(net);
5363
5364         WARN_ON(!xa_empty(&pernet->tcp_ps));
5365         WARN_ON(!xa_empty(&pernet->udp_ps));
5366         WARN_ON(!xa_empty(&pernet->ipoib_ps));
5367         WARN_ON(!xa_empty(&pernet->ib_ps));
5368 }
5369
5370 static struct pernet_operations cma_pernet_operations = {
5371         .init = cma_init_net,
5372         .exit = cma_exit_net,
5373         .id = &cma_pernet_id,
5374         .size = sizeof(struct cma_pernet),
5375 };
5376
5377 static int __init cma_init(void)
5378 {
5379         int ret;
5380
5381         /*
5382          * There is a rare lock ordering dependency in cma_netdev_callback()
5383          * that only happens when bonding is enabled. Teach lockdep that rtnl
5384          * must never be nested under lock so it can find these without having
5385          * to test with bonding.
5386          */
5387         if (IS_ENABLED(CONFIG_LOCKDEP)) {
5388                 rtnl_lock();
5389                 mutex_lock(&lock);
5390                 mutex_unlock(&lock);
5391                 rtnl_unlock();
5392         }
5393
5394         cma_wq = alloc_ordered_workqueue("rdma_cm", WQ_MEM_RECLAIM);
5395         if (!cma_wq)
5396                 return -ENOMEM;
5397
5398         ret = register_pernet_subsys(&cma_pernet_operations);
5399         if (ret)
5400                 goto err_wq;
5401
5402         ib_sa_register_client(&sa_client);
5403         register_netdevice_notifier(&cma_nb);
5404         register_netevent_notifier(&cma_netevent_cb);
5405
5406         ret = ib_register_client(&cma_client);
5407         if (ret)
5408                 goto err;
5409
5410         ret = cma_configfs_init();
5411         if (ret)
5412                 goto err_ib;
5413
5414         return 0;
5415
5416 err_ib:
5417         ib_unregister_client(&cma_client);
5418 err:
5419         unregister_netevent_notifier(&cma_netevent_cb);
5420         unregister_netdevice_notifier(&cma_nb);
5421         ib_sa_unregister_client(&sa_client);
5422         unregister_pernet_subsys(&cma_pernet_operations);
5423 err_wq:
5424         destroy_workqueue(cma_wq);
5425         return ret;
5426 }
5427
5428 static void __exit cma_cleanup(void)
5429 {
5430         cma_configfs_exit();
5431         ib_unregister_client(&cma_client);
5432         unregister_netevent_notifier(&cma_netevent_cb);
5433         unregister_netdevice_notifier(&cma_nb);
5434         ib_sa_unregister_client(&sa_client);
5435         unregister_pernet_subsys(&cma_pernet_operations);
5436         destroy_workqueue(cma_wq);
5437 }
5438
5439 module_init(cma_init);
5440 module_exit(cma_cleanup);