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 16
  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             __builtin_object_size(sa, 0) >= sizeof(struct sockaddr_in)) {
 484                 return memcmp(&((struct sockaddr_in *)sa)->sin_addr,
 485                               &((struct sockaddr_in *)sb)->sin_addr,
 486                               sizeof(((struct sockaddr_in *)sa)->sin_addr));
 487         }
 488
 489         if (sa->sa_family == AF_INET6 &&
 490             __builtin_object_size(sa, 0) >= sizeof(struct sockaddr_in6)) {
 491                 return ipv6_addr_cmp(&((struct sockaddr_in6 *)sa)->sin6_addr,
 492                                      &((struct sockaddr_in6 *)sb)->sin6_addr);
 493         }
 494
 495         return -1;
 496 }
 497
 498 static int cma_add_id_to_tree(struct rdma_id_private *node_id_priv)
 499 {
 500         struct rb_node **new, *parent = NULL;
 501         struct id_table_entry *this, *node;
 502         unsigned long flags;
 503         int result;
 504
 505         node = kzalloc(sizeof(*node), GFP_KERNEL);
 506         if (!node)
 507                 return -ENOMEM;
 508
 509         spin_lock_irqsave(&id_table_lock, flags);
 510         new = &id_table.rb_node;
 511         while (*new) {
 512                 this = container_of(*new, struct id_table_entry, rb_node);
 513                 result = compare_netdev_and_ip(
 514                         node_id_priv->id.route.addr.dev_addr.bound_dev_if,
 515                         cma_dst_addr(node_id_priv), this);
 516
 517                 parent = *new;
 518                 if (result < 0)
 519                         new = &((*new)->rb_left);
 520                 else if (result > 0)
 521                         new = &((*new)->rb_right);
 522                 else {
 523                         list_add_tail(&node_id_priv->id_list_entry,
 524                                       &this->id_list);
 525                         kfree(node);
 526                         goto unlock;
 527                 }
 528         }
 529
 530         INIT_LIST_HEAD(&node->id_list);
 531         list_add_tail(&node_id_priv->id_list_entry, &node->id_list);
 532
 533         rb_link_node(&node->rb_node, parent, new);
 534         rb_insert_color(&node->rb_node, &id_table);
 535
 536 unlock:
 537         spin_unlock_irqrestore(&id_table_lock, flags);
 538         return 0;
 539 }
 540
 541 static struct id_table_entry *
 542 node_from_ndev_ip(struct rb_root *root, int ifindex, struct sockaddr *sa)
 543 {
 544         struct rb_node *node = root->rb_node;
 545         struct id_table_entry *data;
 546         int result;
 547
 548         while (node) {
 549                 data = container_of(node, struct id_table_entry, rb_node);
 550                 result = compare_netdev_and_ip(ifindex, sa, data);
 551                 if (result < 0)
 552                         node = node->rb_left;
 553                 else if (result > 0)
 554                         node = node->rb_right;
 555                 else
 556                         return data;
 557         }
 558
 559         return NULL;
 560 }
 561
 562 static void cma_remove_id_from_tree(struct rdma_id_private *id_priv)
 563 {
 564         struct id_table_entry *data;
 565         unsigned long flags;
 566
 567         spin_lock_irqsave(&id_table_lock, flags);
 568         if (list_empty(&id_priv->id_list_entry))
 569                 goto out;
 570
 571         data = node_from_ndev_ip(&id_table,
 572                                  id_priv->id.route.addr.dev_addr.bound_dev_if,
 573                                  cma_dst_addr(id_priv));
 574         if (!data)
 575                 goto out;
 576
 577         list_del_init(&id_priv->id_list_entry);
 578         if (list_empty(&data->id_list)) {
 579                 rb_erase(&data->rb_node, &id_table);
 580                 kfree(data);
 581         }
 582 out:
 583         spin_unlock_irqrestore(&id_table_lock, flags);
 584 }
 585
 586 static void _cma_attach_to_dev(struct rdma_id_private *id_priv,
 587                                struct cma_device *cma_dev)
 588 {
 589         cma_dev_get(cma_dev);
 590         id_priv->cma_dev = cma_dev;
 591         id_priv->id.device = cma_dev->device;
 592         id_priv->id.route.addr.dev_addr.transport =
 593                 rdma_node_get_transport(cma_dev->device->node_type);
 594         list_add_tail(&id_priv->device_item, &cma_dev->id_list);
 595
 596         trace_cm_id_attach(id_priv, cma_dev->device);
 597 }
 598
 599 static void cma_attach_to_dev(struct rdma_id_private *id_priv,
 600                               struct cma_device *cma_dev)
 601 {
 602         _cma_attach_to_dev(id_priv, cma_dev);
 603         id_priv->gid_type =
 604                 cma_dev->default_gid_type[id_priv->id.port_num -
 605                                           rdma_start_port(cma_dev->device)];
 606 }
 607
 608 static void cma_release_dev(struct rdma_id_private *id_priv)
 609 {
 610         mutex_lock(&lock);
 611         list_del_init(&id_priv->device_item);
 612         cma_dev_put(id_priv->cma_dev);
 613         id_priv->cma_dev = NULL;
 614         id_priv->id.device = NULL;
 615         if (id_priv->id.route.addr.dev_addr.sgid_attr) {
 616                 rdma_put_gid_attr(id_priv->id.route.addr.dev_addr.sgid_attr);
 617                 id_priv->id.route.addr.dev_addr.sgid_attr = NULL;
 618         }
 619         mutex_unlock(&lock);
 620 }
 621
 622 static inline unsigned short cma_family(struct rdma_id_private *id_priv)
 623 {
 624         return id_priv->id.route.addr.src_addr.ss_family;
 625 }
 626
 627 static int cma_set_default_qkey(struct rdma_id_private *id_priv)
 628 {
 629         struct ib_sa_mcmember_rec rec;
 630         int ret = 0;
 631
 632         switch (id_priv->id.ps) {
 633         case RDMA_PS_UDP:
 634         case RDMA_PS_IB:
 635                 id_priv->qkey = RDMA_UDP_QKEY;
 636                 break;
 637         case RDMA_PS_IPOIB:
 638                 ib_addr_get_mgid(&id_priv->id.route.addr.dev_addr, &rec.mgid);
 639                 ret = ib_sa_get_mcmember_rec(id_priv->id.device,
 640                                              id_priv->id.port_num, &rec.mgid,
 641                                              &rec);
 642                 if (!ret)
 643                         id_priv->qkey = be32_to_cpu(rec.qkey);
 644                 break;
 645         default:
 646                 break;
 647         }
 648         return ret;
 649 }
 650
 651 static int cma_set_qkey(struct rdma_id_private *id_priv, u32 qkey)
 652 {
 653         if (!qkey ||
 654             (id_priv->qkey && (id_priv->qkey != qkey)))
 655                 return -EINVAL;
 656
 657         id_priv->qkey = qkey;
 658         return 0;
 659 }
 660
 661 static void cma_translate_ib(struct sockaddr_ib *sib, struct rdma_dev_addr *dev_addr)
 662 {
 663         dev_addr->dev_type = ARPHRD_INFINIBAND;
 664         rdma_addr_set_sgid(dev_addr, (union ib_gid *) &sib->sib_addr);
 665         ib_addr_set_pkey(dev_addr, ntohs(sib->sib_pkey));
 666 }
 667
 668 static int cma_translate_addr(struct sockaddr *addr, struct rdma_dev_addr *dev_addr)
 669 {
 670         int ret;
 671
 672         if (addr->sa_family != AF_IB) {
 673                 ret = rdma_translate_ip(addr, dev_addr);
 674         } else {
 675                 cma_translate_ib((struct sockaddr_ib *) addr, dev_addr);
 676                 ret = 0;
 677         }
 678
 679         return ret;
 680 }
 681
 682 static const struct ib_gid_attr *
 683 cma_validate_port(struct ib_device *device, u32 port,
 684                   enum ib_gid_type gid_type,
 685                   union ib_gid *gid,
 686                   struct rdma_id_private *id_priv)
 687 {
 688         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
 689         const struct ib_gid_attr *sgid_attr = ERR_PTR(-ENODEV);
 690         int bound_if_index = dev_addr->bound_dev_if;
 691         int dev_type = dev_addr->dev_type;
 692         struct net_device *ndev = NULL;
 693
 694         if (!rdma_dev_access_netns(device, id_priv->id.route.addr.dev_addr.net))
 695                 goto out;
 696
 697         if ((dev_type == ARPHRD_INFINIBAND) && !rdma_protocol_ib(device, port))
 698                 goto out;
 699
 700         if ((dev_type != ARPHRD_INFINIBAND) && rdma_protocol_ib(device, port))
 701                 goto out;
 702
 703         /*
 704          * For drivers that do not associate more than one net device with
 705          * their gid tables, such as iWARP drivers, it is sufficient to
 706          * return the first table entry.
 707          *
 708          * Other driver classes might be included in the future.
 709          */
 710         if (rdma_protocol_iwarp(device, port)) {
 711                 sgid_attr = rdma_get_gid_attr(device, port, 0);
 712                 if (IS_ERR(sgid_attr))
 713                         goto out;
 714
 715                 rcu_read_lock();
 716                 ndev = rcu_dereference(sgid_attr->ndev);
 717                 if (!net_eq(dev_net(ndev), dev_addr->net) ||
 718                     ndev->ifindex != bound_if_index)
 719                         sgid_attr = ERR_PTR(-ENODEV);
 720                 rcu_read_unlock();
 721                 goto out;
 722         }
 723
 724         if (dev_type == ARPHRD_ETHER && rdma_protocol_roce(device, port)) {
 725                 ndev = dev_get_by_index(dev_addr->net, bound_if_index);
 726                 if (!ndev)
 727                         goto out;
 728         } else {
 729                 gid_type = IB_GID_TYPE_IB;
 730         }
 731
 732         sgid_attr = rdma_find_gid_by_port(device, gid, gid_type, port, ndev);
 733         dev_put(ndev);
 734 out:
 735         return sgid_attr;
 736 }
 737
 738 static void cma_bind_sgid_attr(struct rdma_id_private *id_priv,
 739                                const struct ib_gid_attr *sgid_attr)
 740 {
 741         WARN_ON(id_priv->id.route.addr.dev_addr.sgid_attr);
 742         id_priv->id.route.addr.dev_addr.sgid_attr = sgid_attr;
 743 }
 744
 745 /**
 746  * cma_acquire_dev_by_src_ip - Acquire cma device, port, gid attribute
 747  * based on source ip address.
 748  * @id_priv:    cm_id which should be bound to cma device
 749  *
 750  * cma_acquire_dev_by_src_ip() binds cm id to cma device, port and GID attribute
 751  * based on source IP address. It returns 0 on success or error code otherwise.
 752  * It is applicable to active and passive side cm_id.
 753  */
 754 static int cma_acquire_dev_by_src_ip(struct rdma_id_private *id_priv)
 755 {
 756         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
 757         const struct ib_gid_attr *sgid_attr;
 758         union ib_gid gid, iboe_gid, *gidp;
 759         struct cma_device *cma_dev;
 760         enum ib_gid_type gid_type;
 761         int ret = -ENODEV;
 762         u32 port;
 763
 764         if (dev_addr->dev_type != ARPHRD_INFINIBAND &&
 765             id_priv->id.ps == RDMA_PS_IPOIB)
 766                 return -EINVAL;
 767
 768         rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
 769                     &iboe_gid);
 770
 771         memcpy(&gid, dev_addr->src_dev_addr +
 772                rdma_addr_gid_offset(dev_addr), sizeof(gid));
 773
 774         mutex_lock(&lock);
 775         list_for_each_entry(cma_dev, &dev_list, list) {
 776                 rdma_for_each_port (cma_dev->device, port) {
 777                         gidp = rdma_protocol_roce(cma_dev->device, port) ?
 778                                &iboe_gid : &gid;
 779                         gid_type = cma_dev->default_gid_type[port - 1];
 780                         sgid_attr = cma_validate_port(cma_dev->device, port,
 781                                                       gid_type, gidp, id_priv);
 782                         if (!IS_ERR(sgid_attr)) {
 783                                 id_priv->id.port_num = port;
 784                                 cma_bind_sgid_attr(id_priv, sgid_attr);
 785                                 cma_attach_to_dev(id_priv, cma_dev);
 786                                 ret = 0;
 787                                 goto out;
 788                         }
 789                 }
 790         }
 791 out:
 792         mutex_unlock(&lock);
 793         return ret;
 794 }
 795
 796 /**
 797  * cma_ib_acquire_dev - Acquire cma device, port and SGID attribute
 798  * @id_priv:            cm id to bind to cma device
 799  * @listen_id_priv:     listener cm id to match against
 800  * @req:                Pointer to req structure containaining incoming
 801  *                      request information
 802  * cma_ib_acquire_dev() acquires cma device, port and SGID attribute when
 803  * rdma device matches for listen_id and incoming request. It also verifies
 804  * that a GID table entry is present for the source address.
 805  * Returns 0 on success, or returns error code otherwise.
 806  */
 807 static int cma_ib_acquire_dev(struct rdma_id_private *id_priv,
 808                               const struct rdma_id_private *listen_id_priv,
 809                               struct cma_req_info *req)
 810 {
 811         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
 812         const struct ib_gid_attr *sgid_attr;
 813         enum ib_gid_type gid_type;
 814         union ib_gid gid;
 815
 816         if (dev_addr->dev_type != ARPHRD_INFINIBAND &&
 817             id_priv->id.ps == RDMA_PS_IPOIB)
 818                 return -EINVAL;
 819
 820         if (rdma_protocol_roce(req->device, req->port))
 821                 rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
 822                             &gid);
 823         else
 824                 memcpy(&gid, dev_addr->src_dev_addr +
 825                        rdma_addr_gid_offset(dev_addr), sizeof(gid));
 826
 827         gid_type = listen_id_priv->cma_dev->default_gid_type[req->port - 1];
 828         sgid_attr = cma_validate_port(req->device, req->port,
 829                                       gid_type, &gid, id_priv);
 830         if (IS_ERR(sgid_attr))
 831                 return PTR_ERR(sgid_attr);
 832
 833         id_priv->id.port_num = req->port;
 834         cma_bind_sgid_attr(id_priv, sgid_attr);
 835         /* Need to acquire lock to protect against reader
 836          * of cma_dev->id_list such as cma_netdev_callback() and
 837          * cma_process_remove().
 838          */
 839         mutex_lock(&lock);
 840         cma_attach_to_dev(id_priv, listen_id_priv->cma_dev);
 841         mutex_unlock(&lock);
 842         rdma_restrack_add(&id_priv->res);
 843         return 0;
 844 }
 845
 846 static int cma_iw_acquire_dev(struct rdma_id_private *id_priv,
 847                               const struct rdma_id_private *listen_id_priv)
 848 {
 849         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
 850         const struct ib_gid_attr *sgid_attr;
 851         struct cma_device *cma_dev;
 852         enum ib_gid_type gid_type;
 853         int ret = -ENODEV;
 854         union ib_gid gid;
 855         u32 port;
 856
 857         if (dev_addr->dev_type != ARPHRD_INFINIBAND &&
 858             id_priv->id.ps == RDMA_PS_IPOIB)
 859                 return -EINVAL;
 860
 861         memcpy(&gid, dev_addr->src_dev_addr +
 862                rdma_addr_gid_offset(dev_addr), sizeof(gid));
 863
 864         mutex_lock(&lock);
 865
 866         cma_dev = listen_id_priv->cma_dev;
 867         port = listen_id_priv->id.port_num;
 868         gid_type = listen_id_priv->gid_type;
 869         sgid_attr = cma_validate_port(cma_dev->device, port,
 870                                       gid_type, &gid, id_priv);
 871         if (!IS_ERR(sgid_attr)) {
 872                 id_priv->id.port_num = port;
 873                 cma_bind_sgid_attr(id_priv, sgid_attr);
 874                 ret = 0;
 875                 goto out;
 876         }
 877
 878         list_for_each_entry(cma_dev, &dev_list, list) {
 879                 rdma_for_each_port (cma_dev->device, port) {
 880                         if (listen_id_priv->cma_dev == cma_dev &&
 881                             listen_id_priv->id.port_num == port)
 882                                 continue;
 883
 884                         gid_type = cma_dev->default_gid_type[port - 1];
 885                         sgid_attr = cma_validate_port(cma_dev->device, port,
 886                                                       gid_type, &gid, id_priv);
 887                         if (!IS_ERR(sgid_attr)) {
 888                                 id_priv->id.port_num = port;
 889                                 cma_bind_sgid_attr(id_priv, sgid_attr);
 890                                 ret = 0;
 891                                 goto out;
 892                         }
 893                 }
 894         }
 895
 896 out:
 897         if (!ret) {
 898                 cma_attach_to_dev(id_priv, cma_dev);
 899                 rdma_restrack_add(&id_priv->res);
 900         }
 901
 902         mutex_unlock(&lock);
 903         return ret;
 904 }
 905
 906 /*
 907  * Select the source IB device and address to reach the destination IB address.
 908  */
 909 static int cma_resolve_ib_dev(struct rdma_id_private *id_priv)
 910 {
 911         struct cma_device *cma_dev, *cur_dev;
 912         struct sockaddr_ib *addr;
 913         union ib_gid gid, sgid, *dgid;
 914         unsigned int p;
 915         u16 pkey, index;
 916         enum ib_port_state port_state;
 917         int ret;
 918         int i;
 919
 920         cma_dev = NULL;
 921         addr = (struct sockaddr_ib *) cma_dst_addr(id_priv);
 922         dgid = (union ib_gid *) &addr->sib_addr;
 923         pkey = ntohs(addr->sib_pkey);
 924
 925         mutex_lock(&lock);
 926         list_for_each_entry(cur_dev, &dev_list, list) {
 927                 rdma_for_each_port (cur_dev->device, p) {
 928                         if (!rdma_cap_af_ib(cur_dev->device, p))
 929                                 continue;
 930
 931                         if (ib_find_cached_pkey(cur_dev->device, p, pkey, &index))
 932                                 continue;
 933
 934                         if (ib_get_cached_port_state(cur_dev->device, p, &port_state))
 935                                 continue;
 936
 937                         for (i = 0; i < cur_dev->device->port_data[p].immutable.gid_tbl_len;
 938                              ++i) {
 939                                 ret = rdma_query_gid(cur_dev->device, p, i,
 940                                                      &gid);
 941                                 if (ret)
 942                                         continue;
 943
 944                                 if (!memcmp(&gid, dgid, sizeof(gid))) {
 945                                         cma_dev = cur_dev;
 946                                         sgid = gid;
 947                                         id_priv->id.port_num = p;
 948                                         goto found;
 949                                 }
 950
 951                                 if (!cma_dev && (gid.global.subnet_prefix ==
 952                                     dgid->global.subnet_prefix) &&
 953                                     port_state == IB_PORT_ACTIVE) {
 954                                         cma_dev = cur_dev;
 955                                         sgid = gid;
 956                                         id_priv->id.port_num = p;
 957                                         goto found;
 958                                 }
 959                         }
 960                 }
 961         }
 962         mutex_unlock(&lock);
 963         return -ENODEV;
 964
 965 found:
 966         cma_attach_to_dev(id_priv, cma_dev);
 967         rdma_restrack_add(&id_priv->res);
 968         mutex_unlock(&lock);
 969         addr = (struct sockaddr_ib *)cma_src_addr(id_priv);
 970         memcpy(&addr->sib_addr, &sgid, sizeof(sgid));
 971         cma_translate_ib(addr, &id_priv->id.route.addr.dev_addr);
 972         return 0;
 973 }
 974
 975 static void cma_id_get(struct rdma_id_private *id_priv)
 976 {
 977         refcount_inc(&id_priv->refcount);
 978 }
 979
 980 static void cma_id_put(struct rdma_id_private *id_priv)
 981 {
 982         if (refcount_dec_and_test(&id_priv->refcount))
 983                 complete(&id_priv->comp);
 984 }
 985
 986 static struct rdma_id_private *
 987 __rdma_create_id(struct net *net, rdma_cm_event_handler event_handler,
 988                  void *context, enum rdma_ucm_port_space ps,
 989                  enum ib_qp_type qp_type, const struct rdma_id_private *parent)
 990 {
 991         struct rdma_id_private *id_priv;
 992
 993         id_priv = kzalloc(sizeof *id_priv, GFP_KERNEL);
 994         if (!id_priv)
 995                 return ERR_PTR(-ENOMEM);
 996
 997         id_priv->state = RDMA_CM_IDLE;
 998         id_priv->id.context = context;
 999         id_priv->id.event_handler = event_handler;
1000         id_priv->id.ps = ps;
1001         id_priv->id.qp_type = qp_type;
1002         id_priv->tos_set = false;
1003         id_priv->timeout_set = false;
1004         id_priv->min_rnr_timer_set = false;
1005         id_priv->gid_type = IB_GID_TYPE_IB;
1006         spin_lock_init(&id_priv->lock);
1007         mutex_init(&id_priv->qp_mutex);
1008         init_completion(&id_priv->comp);
1009         refcount_set(&id_priv->refcount, 1);
1010         mutex_init(&id_priv->handler_mutex);
1011         INIT_LIST_HEAD(&id_priv->device_item);
1012         INIT_LIST_HEAD(&id_priv->id_list_entry);
1013         INIT_LIST_HEAD(&id_priv->listen_list);
1014         INIT_LIST_HEAD(&id_priv->mc_list);
1015         get_random_bytes(&id_priv->seq_num, sizeof id_priv->seq_num);
1016         id_priv->id.route.addr.dev_addr.net = get_net(net);
1017         id_priv->seq_num &= 0x00ffffff;
1018
1019         rdma_restrack_new(&id_priv->res, RDMA_RESTRACK_CM_ID);
1020         if (parent)
1021                 rdma_restrack_parent_name(&id_priv->res, &parent->res);
1022
1023         return id_priv;
1024 }
1025
1026 struct rdma_cm_id *
1027 __rdma_create_kernel_id(struct net *net, rdma_cm_event_handler event_handler,
1028                         void *context, enum rdma_ucm_port_space ps,
1029                         enum ib_qp_type qp_type, const char *caller)
1030 {
1031         struct rdma_id_private *ret;
1032
1033         ret = __rdma_create_id(net, event_handler, context, ps, qp_type, NULL);
1034         if (IS_ERR(ret))
1035                 return ERR_CAST(ret);
1036
1037         rdma_restrack_set_name(&ret->res, caller);
1038         return &ret->id;
1039 }
1040 EXPORT_SYMBOL(__rdma_create_kernel_id);
1041
1042 struct rdma_cm_id *rdma_create_user_id(rdma_cm_event_handler event_handler,
1043                                        void *context,
1044                                        enum rdma_ucm_port_space ps,
1045                                        enum ib_qp_type qp_type)
1046 {
1047         struct rdma_id_private *ret;
1048
1049         ret = __rdma_create_id(current->nsproxy->net_ns, event_handler, context,
1050                                ps, qp_type, NULL);
1051         if (IS_ERR(ret))
1052                 return ERR_CAST(ret);
1053
1054         rdma_restrack_set_name(&ret->res, NULL);
1055         return &ret->id;
1056 }
1057 EXPORT_SYMBOL(rdma_create_user_id);
1058
1059 static int cma_init_ud_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
1060 {
1061         struct ib_qp_attr qp_attr;
1062         int qp_attr_mask, ret;
1063
1064         qp_attr.qp_state = IB_QPS_INIT;
1065         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
1066         if (ret)
1067                 return ret;
1068
1069         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
1070         if (ret)
1071                 return ret;
1072
1073         qp_attr.qp_state = IB_QPS_RTR;
1074         ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
1075         if (ret)
1076                 return ret;
1077
1078         qp_attr.qp_state = IB_QPS_RTS;
1079         qp_attr.sq_psn = 0;
1080         ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE | IB_QP_SQ_PSN);
1081
1082         return ret;
1083 }
1084
1085 static int cma_init_conn_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
1086 {
1087         struct ib_qp_attr qp_attr;
1088         int qp_attr_mask, ret;
1089
1090         qp_attr.qp_state = IB_QPS_INIT;
1091         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
1092         if (ret)
1093                 return ret;
1094
1095         return ib_modify_qp(qp, &qp_attr, qp_attr_mask);
1096 }
1097
1098 int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
1099                    struct ib_qp_init_attr *qp_init_attr)
1100 {
1101         struct rdma_id_private *id_priv;
1102         struct ib_qp *qp;
1103         int ret;
1104
1105         id_priv = container_of(id, struct rdma_id_private, id);
1106         if (id->device != pd->device) {
1107                 ret = -EINVAL;
1108                 goto out_err;
1109         }
1110
1111         qp_init_attr->port_num = id->port_num;
1112         qp = ib_create_qp(pd, qp_init_attr);
1113         if (IS_ERR(qp)) {
1114                 ret = PTR_ERR(qp);
1115                 goto out_err;
1116         }
1117
1118         if (id->qp_type == IB_QPT_UD)
1119                 ret = cma_init_ud_qp(id_priv, qp);
1120         else
1121                 ret = cma_init_conn_qp(id_priv, qp);
1122         if (ret)
1123                 goto out_destroy;
1124
1125         id->qp = qp;
1126         id_priv->qp_num = qp->qp_num;
1127         id_priv->srq = (qp->srq != NULL);
1128         trace_cm_qp_create(id_priv, pd, qp_init_attr, 0);
1129         return 0;
1130 out_destroy:
1131         ib_destroy_qp(qp);
1132 out_err:
1133         trace_cm_qp_create(id_priv, pd, qp_init_attr, ret);
1134         return ret;
1135 }
1136 EXPORT_SYMBOL(rdma_create_qp);
1137
1138 void rdma_destroy_qp(struct rdma_cm_id *id)
1139 {
1140         struct rdma_id_private *id_priv;
1141
1142         id_priv = container_of(id, struct rdma_id_private, id);
1143         trace_cm_qp_destroy(id_priv);
1144         mutex_lock(&id_priv->qp_mutex);
1145         ib_destroy_qp(id_priv->id.qp);
1146         id_priv->id.qp = NULL;
1147         mutex_unlock(&id_priv->qp_mutex);
1148 }
1149 EXPORT_SYMBOL(rdma_destroy_qp);
1150
1151 static int cma_modify_qp_rtr(struct rdma_id_private *id_priv,
1152                              struct rdma_conn_param *conn_param)
1153 {
1154         struct ib_qp_attr qp_attr;
1155         int qp_attr_mask, ret;
1156
1157         mutex_lock(&id_priv->qp_mutex);
1158         if (!id_priv->id.qp) {
1159                 ret = 0;
1160                 goto out;
1161         }
1162
1163         /* Need to update QP attributes from default values. */
1164         qp_attr.qp_state = IB_QPS_INIT;
1165         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
1166         if (ret)
1167                 goto out;
1168
1169         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
1170         if (ret)
1171                 goto out;
1172
1173         qp_attr.qp_state = IB_QPS_RTR;
1174         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
1175         if (ret)
1176                 goto out;
1177
1178         BUG_ON(id_priv->cma_dev->device != id_priv->id.device);
1179
1180         if (conn_param)
1181                 qp_attr.max_dest_rd_atomic = conn_param->responder_resources;
1182         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
1183 out:
1184         mutex_unlock(&id_priv->qp_mutex);
1185         return ret;
1186 }
1187
1188 static int cma_modify_qp_rts(struct rdma_id_private *id_priv,
1189                              struct rdma_conn_param *conn_param)
1190 {
1191         struct ib_qp_attr qp_attr;
1192         int qp_attr_mask, ret;
1193
1194         mutex_lock(&id_priv->qp_mutex);
1195         if (!id_priv->id.qp) {
1196                 ret = 0;
1197                 goto out;
1198         }
1199
1200         qp_attr.qp_state = IB_QPS_RTS;
1201         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
1202         if (ret)
1203                 goto out;
1204
1205         if (conn_param)
1206                 qp_attr.max_rd_atomic = conn_param->initiator_depth;
1207         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
1208 out:
1209         mutex_unlock(&id_priv->qp_mutex);
1210         return ret;
1211 }
1212
1213 static int cma_modify_qp_err(struct rdma_id_private *id_priv)
1214 {
1215         struct ib_qp_attr qp_attr;
1216         int ret;
1217
1218         mutex_lock(&id_priv->qp_mutex);
1219         if (!id_priv->id.qp) {
1220                 ret = 0;
1221                 goto out;
1222         }
1223
1224         qp_attr.qp_state = IB_QPS_ERR;
1225         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, IB_QP_STATE);
1226 out:
1227         mutex_unlock(&id_priv->qp_mutex);
1228         return ret;
1229 }
1230
1231 static int cma_ib_init_qp_attr(struct rdma_id_private *id_priv,
1232                                struct ib_qp_attr *qp_attr, int *qp_attr_mask)
1233 {
1234         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
1235         int ret;
1236         u16 pkey;
1237
1238         if (rdma_cap_eth_ah(id_priv->id.device, id_priv->id.port_num))
1239                 pkey = 0xffff;
1240         else
1241                 pkey = ib_addr_get_pkey(dev_addr);
1242
1243         ret = ib_find_cached_pkey(id_priv->id.device, id_priv->id.port_num,
1244                                   pkey, &qp_attr->pkey_index);
1245         if (ret)
1246                 return ret;
1247
1248         qp_attr->port_num = id_priv->id.port_num;
1249         *qp_attr_mask = IB_QP_STATE | IB_QP_PKEY_INDEX | IB_QP_PORT;
1250
1251         if (id_priv->id.qp_type == IB_QPT_UD) {
1252                 ret = cma_set_default_qkey(id_priv);
1253                 if (ret)
1254                         return ret;
1255
1256                 qp_attr->qkey = id_priv->qkey;
1257                 *qp_attr_mask |= IB_QP_QKEY;
1258         } else {
1259                 qp_attr->qp_access_flags = 0;
1260                 *qp_attr_mask |= IB_QP_ACCESS_FLAGS;
1261         }
1262         return 0;
1263 }
1264
1265 int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
1266                        int *qp_attr_mask)
1267 {
1268         struct rdma_id_private *id_priv;
1269         int ret = 0;
1270
1271         id_priv = container_of(id, struct rdma_id_private, id);
1272         if (rdma_cap_ib_cm(id->device, id->port_num)) {
1273                 if (!id_priv->cm_id.ib || (id_priv->id.qp_type == IB_QPT_UD))
1274                         ret = cma_ib_init_qp_attr(id_priv, qp_attr, qp_attr_mask);
1275                 else
1276                         ret = ib_cm_init_qp_attr(id_priv->cm_id.ib, qp_attr,
1277                                                  qp_attr_mask);
1278
1279                 if (qp_attr->qp_state == IB_QPS_RTR)
1280                         qp_attr->rq_psn = id_priv->seq_num;
1281         } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
1282                 if (!id_priv->cm_id.iw) {
1283                         qp_attr->qp_access_flags = 0;
1284                         *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS;
1285                 } else
1286                         ret = iw_cm_init_qp_attr(id_priv->cm_id.iw, qp_attr,
1287                                                  qp_attr_mask);
1288                 qp_attr->port_num = id_priv->id.port_num;
1289                 *qp_attr_mask |= IB_QP_PORT;
1290         } else {
1291                 ret = -ENOSYS;
1292         }
1293
1294         if ((*qp_attr_mask & IB_QP_TIMEOUT) && id_priv->timeout_set)
1295                 qp_attr->timeout = id_priv->timeout;
1296
1297         if ((*qp_attr_mask & IB_QP_MIN_RNR_TIMER) && id_priv->min_rnr_timer_set)
1298                 qp_attr->min_rnr_timer = id_priv->min_rnr_timer;
1299
1300         return ret;
1301 }
1302 EXPORT_SYMBOL(rdma_init_qp_attr);
1303
1304 static inline bool cma_zero_addr(const struct sockaddr *addr)
1305 {
1306         switch (addr->sa_family) {
1307         case AF_INET:
1308                 return ipv4_is_zeronet(((struct sockaddr_in *)addr)->sin_addr.s_addr);
1309         case AF_INET6:
1310                 return ipv6_addr_any(&((struct sockaddr_in6 *)addr)->sin6_addr);
1311         case AF_IB:
1312                 return ib_addr_any(&((struct sockaddr_ib *)addr)->sib_addr);
1313         default:
1314                 return false;
1315         }
1316 }
1317
1318 static inline bool cma_loopback_addr(const struct sockaddr *addr)
1319 {
1320         switch (addr->sa_family) {
1321         case AF_INET:
1322                 return ipv4_is_loopback(
1323                         ((struct sockaddr_in *)addr)->sin_addr.s_addr);
1324         case AF_INET6:
1325                 return ipv6_addr_loopback(
1326                         &((struct sockaddr_in6 *)addr)->sin6_addr);
1327         case AF_IB:
1328                 return ib_addr_loopback(
1329                         &((struct sockaddr_ib *)addr)->sib_addr);
1330         default:
1331                 return false;
1332         }
1333 }
1334
1335 static inline bool cma_any_addr(const struct sockaddr *addr)
1336 {
1337         return cma_zero_addr(addr) || cma_loopback_addr(addr);
1338 }
1339
1340 static int cma_addr_cmp(const struct sockaddr *src, const struct sockaddr *dst)
1341 {
1342         if (src->sa_family != dst->sa_family)
1343                 return -1;
1344
1345         switch (src->sa_family) {
1346         case AF_INET:
1347                 return ((struct sockaddr_in *)src)->sin_addr.s_addr !=
1348                        ((struct sockaddr_in *)dst)->sin_addr.s_addr;
1349         case AF_INET6: {
1350                 struct sockaddr_in6 *src_addr6 = (struct sockaddr_in6 *)src;
1351                 struct sockaddr_in6 *dst_addr6 = (struct sockaddr_in6 *)dst;
1352                 bool link_local;
1353
1354                 if (ipv6_addr_cmp(&src_addr6->sin6_addr,
1355                                           &dst_addr6->sin6_addr))
1356                         return 1;
1357                 link_local = ipv6_addr_type(&dst_addr6->sin6_addr) &
1358                              IPV6_ADDR_LINKLOCAL;
1359                 /* Link local must match their scope_ids */
1360                 return link_local ? (src_addr6->sin6_scope_id !=
1361                                      dst_addr6->sin6_scope_id) :
1362                                     0;
1363         }
1364
1365         default:
1366                 return ib_addr_cmp(&((struct sockaddr_ib *) src)->sib_addr,
1367                                    &((struct sockaddr_ib *) dst)->sib_addr);
1368         }
1369 }
1370
1371 static __be16 cma_port(const struct sockaddr *addr)
1372 {
1373         struct sockaddr_ib *sib;
1374
1375         switch (addr->sa_family) {
1376         case AF_INET:
1377                 return ((struct sockaddr_in *) addr)->sin_port;
1378         case AF_INET6:
1379                 return ((struct sockaddr_in6 *) addr)->sin6_port;
1380         case AF_IB:
1381                 sib = (struct sockaddr_ib *) addr;
1382                 return htons((u16) (be64_to_cpu(sib->sib_sid) &
1383                                     be64_to_cpu(sib->sib_sid_mask)));
1384         default:
1385                 return 0;
1386         }
1387 }
1388
1389 static inline int cma_any_port(const struct sockaddr *addr)
1390 {
1391         return !cma_port(addr);
1392 }
1393
1394 static void cma_save_ib_info(struct sockaddr *src_addr,
1395                              struct sockaddr *dst_addr,
1396                              const struct rdma_cm_id *listen_id,
1397                              const struct sa_path_rec *path)
1398 {
1399         struct sockaddr_ib *listen_ib, *ib;
1400
1401         listen_ib = (struct sockaddr_ib *) &listen_id->route.addr.src_addr;
1402         if (src_addr) {
1403                 ib = (struct sockaddr_ib *)src_addr;
1404                 ib->sib_family = AF_IB;
1405                 if (path) {
1406                         ib->sib_pkey = path->pkey;
1407                         ib->sib_flowinfo = path->flow_label;
1408                         memcpy(&ib->sib_addr, &path->sgid, 16);
1409                         ib->sib_sid = path->service_id;
1410                         ib->sib_scope_id = 0;
1411                 } else {
1412                         ib->sib_pkey = listen_ib->sib_pkey;
1413                         ib->sib_flowinfo = listen_ib->sib_flowinfo;
1414                         ib->sib_addr = listen_ib->sib_addr;
1415                         ib->sib_sid = listen_ib->sib_sid;
1416                         ib->sib_scope_id = listen_ib->sib_scope_id;
1417                 }
1418                 ib->sib_sid_mask = cpu_to_be64(0xffffffffffffffffULL);
1419         }
1420         if (dst_addr) {
1421                 ib = (struct sockaddr_ib *)dst_addr;
1422                 ib->sib_family = AF_IB;
1423                 if (path) {
1424                         ib->sib_pkey = path->pkey;
1425                         ib->sib_flowinfo = path->flow_label;
1426                         memcpy(&ib->sib_addr, &path->dgid, 16);
1427                 }
1428         }
1429 }
1430
1431 static void cma_save_ip4_info(struct sockaddr_in *src_addr,
1432                               struct sockaddr_in *dst_addr,
1433                               struct cma_hdr *hdr,
1434                               __be16 local_port)
1435 {
1436         if (src_addr) {
1437                 *src_addr = (struct sockaddr_in) {
1438                         .sin_family = AF_INET,
1439                         .sin_addr.s_addr = hdr->dst_addr.ip4.addr,
1440                         .sin_port = local_port,
1441                 };
1442         }
1443
1444         if (dst_addr) {
1445                 *dst_addr = (struct sockaddr_in) {
1446                         .sin_family = AF_INET,
1447                         .sin_addr.s_addr = hdr->src_addr.ip4.addr,
1448                         .sin_port = hdr->port,
1449                 };
1450         }
1451 }
1452
1453 static void cma_save_ip6_info(struct sockaddr_in6 *src_addr,
1454                               struct sockaddr_in6 *dst_addr,
1455                               struct cma_hdr *hdr,
1456                               __be16 local_port)
1457 {
1458         if (src_addr) {
1459                 *src_addr = (struct sockaddr_in6) {
1460                         .sin6_family = AF_INET6,
1461                         .sin6_addr = hdr->dst_addr.ip6,
1462                         .sin6_port = local_port,
1463                 };
1464         }
1465
1466         if (dst_addr) {
1467                 *dst_addr = (struct sockaddr_in6) {
1468                         .sin6_family = AF_INET6,
1469                         .sin6_addr = hdr->src_addr.ip6,
1470                         .sin6_port = hdr->port,
1471                 };
1472         }
1473 }
1474
1475 static u16 cma_port_from_service_id(__be64 service_id)
1476 {
1477         return (u16)be64_to_cpu(service_id);
1478 }
1479
1480 static int cma_save_ip_info(struct sockaddr *src_addr,
1481                             struct sockaddr *dst_addr,
1482                             const struct ib_cm_event *ib_event,
1483                             __be64 service_id)
1484 {
1485         struct cma_hdr *hdr;
1486         __be16 port;
1487
1488         hdr = ib_event->private_data;
1489         if (hdr->cma_version != CMA_VERSION)
1490                 return -EINVAL;
1491
1492         port = htons(cma_port_from_service_id(service_id));
1493
1494         switch (cma_get_ip_ver(hdr)) {
1495         case 4:
1496                 cma_save_ip4_info((struct sockaddr_in *)src_addr,
1497                                   (struct sockaddr_in *)dst_addr, hdr, port);
1498                 break;
1499         case 6:
1500                 cma_save_ip6_info((struct sockaddr_in6 *)src_addr,
1501                                   (struct sockaddr_in6 *)dst_addr, hdr, port);
1502                 break;
1503         default:
1504                 return -EAFNOSUPPORT;
1505         }
1506
1507         return 0;
1508 }
1509
1510 static int cma_save_net_info(struct sockaddr *src_addr,
1511                              struct sockaddr *dst_addr,
1512                              const struct rdma_cm_id *listen_id,
1513                              const struct ib_cm_event *ib_event,
1514                              sa_family_t sa_family, __be64 service_id)
1515 {
1516         if (sa_family == AF_IB) {
1517                 if (ib_event->event == IB_CM_REQ_RECEIVED)
1518                         cma_save_ib_info(src_addr, dst_addr, listen_id,
1519                                          ib_event->param.req_rcvd.primary_path);
1520                 else if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED)
1521                         cma_save_ib_info(src_addr, dst_addr, listen_id, NULL);
1522                 return 0;
1523         }
1524
1525         return cma_save_ip_info(src_addr, dst_addr, ib_event, service_id);
1526 }
1527
1528 static int cma_save_req_info(const struct ib_cm_event *ib_event,
1529                              struct cma_req_info *req)
1530 {
1531         const struct ib_cm_req_event_param *req_param =
1532                 &ib_event->param.req_rcvd;
1533         const struct ib_cm_sidr_req_event_param *sidr_param =
1534                 &ib_event->param.sidr_req_rcvd;
1535
1536         switch (ib_event->event) {
1537         case IB_CM_REQ_RECEIVED:
1538                 req->device     = req_param->listen_id->device;
1539                 req->port       = req_param->port;
1540                 memcpy(&req->local_gid, &req_param->primary_path->sgid,
1541                        sizeof(req->local_gid));
1542                 req->has_gid    = true;
1543                 req->service_id = req_param->primary_path->service_id;
1544                 req->pkey       = be16_to_cpu(req_param->primary_path->pkey);
1545                 if (req->pkey != req_param->bth_pkey)
1546                         pr_warn_ratelimited("RDMA CMA: got different BTH P_Key (0x%x) and primary path P_Key (0x%x)\n"
1547                                             "RDMA CMA: in the future this may cause the request to be dropped\n",
1548                                             req_param->bth_pkey, req->pkey);
1549                 break;
1550         case IB_CM_SIDR_REQ_RECEIVED:
1551                 req->device     = sidr_param->listen_id->device;
1552                 req->port       = sidr_param->port;
1553                 req->has_gid    = false;
1554                 req->service_id = sidr_param->service_id;
1555                 req->pkey       = sidr_param->pkey;
1556                 if (req->pkey != sidr_param->bth_pkey)
1557                         pr_warn_ratelimited("RDMA CMA: got different BTH P_Key (0x%x) and SIDR request payload P_Key (0x%x)\n"
1558                                             "RDMA CMA: in the future this may cause the request to be dropped\n",
1559                                             sidr_param->bth_pkey, req->pkey);
1560                 break;
1561         default:
1562                 return -EINVAL;
1563         }
1564
1565         return 0;
1566 }
1567
1568 static bool validate_ipv4_net_dev(struct net_device *net_dev,
1569                                   const struct sockaddr_in *dst_addr,
1570                                   const struct sockaddr_in *src_addr)
1571 {
1572         __be32 daddr = dst_addr->sin_addr.s_addr,
1573                saddr = src_addr->sin_addr.s_addr;
1574         struct fib_result res;
1575         struct flowi4 fl4;
1576         int err;
1577         bool ret;
1578
1579         if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) ||
1580             ipv4_is_lbcast(daddr) || ipv4_is_zeronet(saddr) ||
1581             ipv4_is_zeronet(daddr) || ipv4_is_loopback(daddr) ||
1582             ipv4_is_loopback(saddr))
1583                 return false;
1584
1585         memset(&fl4, 0, sizeof(fl4));
1586         fl4.flowi4_oif = net_dev->ifindex;
1587         fl4.daddr = daddr;
1588         fl4.saddr = saddr;
1589
1590         rcu_read_lock();
1591         err = fib_lookup(dev_net(net_dev), &fl4, &res, 0);
1592         ret = err == 0 && FIB_RES_DEV(res) == net_dev;
1593         rcu_read_unlock();
1594
1595         return ret;
1596 }
1597
1598 static bool validate_ipv6_net_dev(struct net_device *net_dev,
1599                                   const struct sockaddr_in6 *dst_addr,
1600                                   const struct sockaddr_in6 *src_addr)
1601 {
1602 #if IS_ENABLED(CONFIG_IPV6)
1603         const int strict = ipv6_addr_type(&dst_addr->sin6_addr) &
1604                            IPV6_ADDR_LINKLOCAL;
1605         struct rt6_info *rt = rt6_lookup(dev_net(net_dev), &dst_addr->sin6_addr,
1606                                          &src_addr->sin6_addr, net_dev->ifindex,
1607                                          NULL, strict);
1608         bool ret;
1609
1610         if (!rt)
1611                 return false;
1612
1613         ret = rt->rt6i_idev->dev == net_dev;
1614         ip6_rt_put(rt);
1615
1616         return ret;
1617 #else
1618         return false;
1619 #endif
1620 }
1621
1622 static bool validate_net_dev(struct net_device *net_dev,
1623                              const struct sockaddr *daddr,
1624                              const struct sockaddr *saddr)
1625 {
1626         const struct sockaddr_in *daddr4 = (const struct sockaddr_in *)daddr;
1627         const struct sockaddr_in *saddr4 = (const struct sockaddr_in *)saddr;
1628         const struct sockaddr_in6 *daddr6 = (const struct sockaddr_in6 *)daddr;
1629         const struct sockaddr_in6 *saddr6 = (const struct sockaddr_in6 *)saddr;
1630
1631         switch (daddr->sa_family) {
1632         case AF_INET:
1633                 return saddr->sa_family == AF_INET &&
1634                        validate_ipv4_net_dev(net_dev, daddr4, saddr4);
1635
1636         case AF_INET6:
1637                 return saddr->sa_family == AF_INET6 &&
1638                        validate_ipv6_net_dev(net_dev, daddr6, saddr6);
1639
1640         default:
1641                 return false;
1642         }
1643 }
1644
1645 static struct net_device *
1646 roce_get_net_dev_by_cm_event(const struct ib_cm_event *ib_event)
1647 {
1648         const struct ib_gid_attr *sgid_attr = NULL;
1649         struct net_device *ndev;
1650
1651         if (ib_event->event == IB_CM_REQ_RECEIVED)
1652                 sgid_attr = ib_event->param.req_rcvd.ppath_sgid_attr;
1653         else if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED)
1654                 sgid_attr = ib_event->param.sidr_req_rcvd.sgid_attr;
1655
1656         if (!sgid_attr)
1657                 return NULL;
1658
1659         rcu_read_lock();
1660         ndev = rdma_read_gid_attr_ndev_rcu(sgid_attr);
1661         if (IS_ERR(ndev))
1662                 ndev = NULL;
1663         else
1664                 dev_hold(ndev);
1665         rcu_read_unlock();
1666         return ndev;
1667 }
1668
1669 static struct net_device *cma_get_net_dev(const struct ib_cm_event *ib_event,
1670                                           struct cma_req_info *req)
1671 {
1672         struct sockaddr *listen_addr =
1673                         (struct sockaddr *)&req->listen_addr_storage;
1674         struct sockaddr *src_addr = (struct sockaddr *)&req->src_addr_storage;
1675         struct net_device *net_dev;
1676         const union ib_gid *gid = req->has_gid ? &req->local_gid : NULL;
1677         int err;
1678
1679         err = cma_save_ip_info(listen_addr, src_addr, ib_event,
1680                                req->service_id);
1681         if (err)
1682                 return ERR_PTR(err);
1683
1684         if (rdma_protocol_roce(req->device, req->port))
1685                 net_dev = roce_get_net_dev_by_cm_event(ib_event);
1686         else
1687                 net_dev = ib_get_net_dev_by_params(req->device, req->port,
1688                                                    req->pkey,
1689                                                    gid, listen_addr);
1690         if (!net_dev)
1691                 return ERR_PTR(-ENODEV);
1692
1693         return net_dev;
1694 }
1695
1696 static enum rdma_ucm_port_space rdma_ps_from_service_id(__be64 service_id)
1697 {
1698         return (be64_to_cpu(service_id) >> 16) & 0xffff;
1699 }
1700
1701 static bool cma_match_private_data(struct rdma_id_private *id_priv,
1702                                    const struct cma_hdr *hdr)
1703 {
1704         struct sockaddr *addr = cma_src_addr(id_priv);
1705         __be32 ip4_addr;
1706         struct in6_addr ip6_addr;
1707
1708         if (cma_any_addr(addr) && !id_priv->afonly)
1709                 return true;
1710
1711         switch (addr->sa_family) {
1712         case AF_INET:
1713                 ip4_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
1714                 if (cma_get_ip_ver(hdr) != 4)
1715                         return false;
1716                 if (!cma_any_addr(addr) &&
1717                     hdr->dst_addr.ip4.addr != ip4_addr)
1718                         return false;
1719                 break;
1720         case AF_INET6:
1721                 ip6_addr = ((struct sockaddr_in6 *)addr)->sin6_addr;
1722                 if (cma_get_ip_ver(hdr) != 6)
1723                         return false;
1724                 if (!cma_any_addr(addr) &&
1725                     memcmp(&hdr->dst_addr.ip6, &ip6_addr, sizeof(ip6_addr)))
1726                         return false;
1727                 break;
1728         case AF_IB:
1729                 return true;
1730         default:
1731                 return false;
1732         }
1733
1734         return true;
1735 }
1736
1737 static bool cma_protocol_roce(const struct rdma_cm_id *id)
1738 {
1739         struct ib_device *device = id->device;
1740         const u32 port_num = id->port_num ?: rdma_start_port(device);
1741
1742         return rdma_protocol_roce(device, port_num);
1743 }
1744
1745 static bool cma_is_req_ipv6_ll(const struct cma_req_info *req)
1746 {
1747         const struct sockaddr *daddr =
1748                         (const struct sockaddr *)&req->listen_addr_storage;
1749         const struct sockaddr_in6 *daddr6 = (const struct sockaddr_in6 *)daddr;
1750
1751         /* Returns true if the req is for IPv6 link local */
1752         return (daddr->sa_family == AF_INET6 &&
1753                 (ipv6_addr_type(&daddr6->sin6_addr) & IPV6_ADDR_LINKLOCAL));
1754 }
1755
1756 static bool cma_match_net_dev(const struct rdma_cm_id *id,
1757                               const struct net_device *net_dev,
1758                               const struct cma_req_info *req)
1759 {
1760         const struct rdma_addr *addr = &id->route.addr;
1761
1762         if (!net_dev)
1763                 /* This request is an AF_IB request */
1764                 return (!id->port_num || id->port_num == req->port) &&
1765                        (addr->src_addr.ss_family == AF_IB);
1766
1767         /*
1768          * If the request is not for IPv6 link local, allow matching
1769          * request to any netdevice of the one or multiport rdma device.
1770          */
1771         if (!cma_is_req_ipv6_ll(req))
1772                 return true;
1773         /*
1774          * Net namespaces must match, and if the listner is listening
1775          * on a specific netdevice than netdevice must match as well.
1776          */
1777         if (net_eq(dev_net(net_dev), addr->dev_addr.net) &&
1778             (!!addr->dev_addr.bound_dev_if ==
1779              (addr->dev_addr.bound_dev_if == net_dev->ifindex)))
1780                 return true;
1781         else
1782                 return false;
1783 }
1784
1785 static struct rdma_id_private *cma_find_listener(
1786                 const struct rdma_bind_list *bind_list,
1787                 const struct ib_cm_id *cm_id,
1788                 const struct ib_cm_event *ib_event,
1789                 const struct cma_req_info *req,
1790                 const struct net_device *net_dev)
1791 {
1792         struct rdma_id_private *id_priv, *id_priv_dev;
1793
1794         lockdep_assert_held(&lock);
1795
1796         if (!bind_list)
1797                 return ERR_PTR(-EINVAL);
1798
1799         hlist_for_each_entry(id_priv, &bind_list->owners, node) {
1800                 if (cma_match_private_data(id_priv, ib_event->private_data)) {
1801                         if (id_priv->id.device == cm_id->device &&
1802                             cma_match_net_dev(&id_priv->id, net_dev, req))
1803                                 return id_priv;
1804                         list_for_each_entry(id_priv_dev,
1805                                             &id_priv->listen_list,
1806                                             listen_item) {
1807                                 if (id_priv_dev->id.device == cm_id->device &&
1808                                     cma_match_net_dev(&id_priv_dev->id,
1809                                                       net_dev, req))
1810                                         return id_priv_dev;
1811                         }
1812                 }
1813         }
1814
1815         return ERR_PTR(-EINVAL);
1816 }
1817
1818 static struct rdma_id_private *
1819 cma_ib_id_from_event(struct ib_cm_id *cm_id,
1820                      const struct ib_cm_event *ib_event,
1821                      struct cma_req_info *req,
1822                      struct net_device **net_dev)
1823 {
1824         struct rdma_bind_list *bind_list;
1825         struct rdma_id_private *id_priv;
1826         int err;
1827
1828         err = cma_save_req_info(ib_event, req);
1829         if (err)
1830                 return ERR_PTR(err);
1831
1832         *net_dev = cma_get_net_dev(ib_event, req);
1833         if (IS_ERR(*net_dev)) {
1834                 if (PTR_ERR(*net_dev) == -EAFNOSUPPORT) {
1835                         /* Assuming the protocol is AF_IB */
1836                         *net_dev = NULL;
1837                 } else {
1838                         return ERR_CAST(*net_dev);
1839                 }
1840         }
1841
1842         mutex_lock(&lock);
1843         /*
1844          * Net namespace might be getting deleted while route lookup,
1845          * cm_id lookup is in progress. Therefore, perform netdevice
1846          * validation, cm_id lookup under rcu lock.
1847          * RCU lock along with netdevice state check, synchronizes with
1848          * netdevice migrating to different net namespace and also avoids
1849          * case where net namespace doesn't get deleted while lookup is in
1850          * progress.
1851          * If the device state is not IFF_UP, its properties such as ifindex
1852          * and nd_net cannot be trusted to remain valid without rcu lock.
1853          * net/core/dev.c change_net_namespace() ensures to synchronize with
1854          * ongoing operations on net device after device is closed using
1855          * synchronize_net().
1856          */
1857         rcu_read_lock();
1858         if (*net_dev) {
1859                 /*
1860                  * If netdevice is down, it is likely that it is administratively
1861                  * down or it might be migrating to different namespace.
1862                  * In that case avoid further processing, as the net namespace
1863                  * or ifindex may change.
1864                  */
1865                 if (((*net_dev)->flags & IFF_UP) == 0) {
1866                         id_priv = ERR_PTR(-EHOSTUNREACH);
1867                         goto err;
1868                 }
1869
1870                 if (!validate_net_dev(*net_dev,
1871                                  (struct sockaddr *)&req->src_addr_storage,
1872                                  (struct sockaddr *)&req->listen_addr_storage)) {
1873                         id_priv = ERR_PTR(-EHOSTUNREACH);
1874                         goto err;
1875                 }
1876         }
1877
1878         bind_list = cma_ps_find(*net_dev ? dev_net(*net_dev) : &init_net,
1879                                 rdma_ps_from_service_id(req->service_id),
1880                                 cma_port_from_service_id(req->service_id));
1881         id_priv = cma_find_listener(bind_list, cm_id, ib_event, req, *net_dev);
1882 err:
1883         rcu_read_unlock();
1884         mutex_unlock(&lock);
1885         if (IS_ERR(id_priv) && *net_dev) {
1886                 dev_put(*net_dev);
1887                 *net_dev = NULL;
1888         }
1889         return id_priv;
1890 }
1891
1892 static inline u8 cma_user_data_offset(struct rdma_id_private *id_priv)
1893 {
1894         return cma_family(id_priv) == AF_IB ? 0 : sizeof(struct cma_hdr);
1895 }
1896
1897 static void cma_cancel_route(struct rdma_id_private *id_priv)
1898 {
1899         if (rdma_cap_ib_sa(id_priv->id.device, id_priv->id.port_num)) {
1900                 if (id_priv->query)
1901                         ib_sa_cancel_query(id_priv->query_id, id_priv->query);
1902         }
1903 }
1904
1905 static void _cma_cancel_listens(struct rdma_id_private *id_priv)
1906 {
1907         struct rdma_id_private *dev_id_priv;
1908
1909         lockdep_assert_held(&lock);
1910
1911         /*
1912          * Remove from listen_any_list to prevent added devices from spawning
1913          * additional listen requests.
1914          */
1915         list_del_init(&id_priv->listen_any_item);
1916
1917         while (!list_empty(&id_priv->listen_list)) {
1918                 dev_id_priv =
1919                         list_first_entry(&id_priv->listen_list,
1920                                          struct rdma_id_private, listen_item);
1921                 /* sync with device removal to avoid duplicate destruction */
1922                 list_del_init(&dev_id_priv->device_item);
1923                 list_del_init(&dev_id_priv->listen_item);
1924                 mutex_unlock(&lock);
1925
1926                 rdma_destroy_id(&dev_id_priv->id);
1927                 mutex_lock(&lock);
1928         }
1929 }
1930
1931 static void cma_cancel_listens(struct rdma_id_private *id_priv)
1932 {
1933         mutex_lock(&lock);
1934         _cma_cancel_listens(id_priv);
1935         mutex_unlock(&lock);
1936 }
1937
1938 static void cma_cancel_operation(struct rdma_id_private *id_priv,
1939                                  enum rdma_cm_state state)
1940 {
1941         switch (state) {
1942         case RDMA_CM_ADDR_QUERY:
1943                 /*
1944                  * We can avoid doing the rdma_addr_cancel() based on state,
1945                  * only RDMA_CM_ADDR_QUERY has a work that could still execute.
1946                  * Notice that the addr_handler work could still be exiting
1947                  * outside this state, however due to the interaction with the
1948                  * handler_mutex the work is guaranteed not to touch id_priv
1949                  * during exit.
1950                  */
1951                 rdma_addr_cancel(&id_priv->id.route.addr.dev_addr);
1952                 break;
1953         case RDMA_CM_ROUTE_QUERY:
1954                 cma_cancel_route(id_priv);
1955                 break;
1956         case RDMA_CM_LISTEN:
1957                 if (cma_any_addr(cma_src_addr(id_priv)) && !id_priv->cma_dev)
1958                         cma_cancel_listens(id_priv);
1959                 break;
1960         default:
1961                 break;
1962         }
1963 }
1964
1965 static void cma_release_port(struct rdma_id_private *id_priv)
1966 {
1967         struct rdma_bind_list *bind_list = id_priv->bind_list;
1968         struct net *net = id_priv->id.route.addr.dev_addr.net;
1969
1970         if (!bind_list)
1971                 return;
1972
1973         mutex_lock(&lock);
1974         hlist_del(&id_priv->node);
1975         if (hlist_empty(&bind_list->owners)) {
1976                 cma_ps_remove(net, bind_list->ps, bind_list->port);
1977                 kfree(bind_list);
1978         }
1979         mutex_unlock(&lock);
1980 }
1981
1982 static void destroy_mc(struct rdma_id_private *id_priv,
1983                        struct cma_multicast *mc)
1984 {
1985         bool send_only = mc->join_state == BIT(SENDONLY_FULLMEMBER_JOIN);
1986
1987         if (rdma_cap_ib_mcast(id_priv->id.device, id_priv->id.port_num))
1988                 ib_sa_free_multicast(mc->sa_mc);
1989
1990         if (rdma_protocol_roce(id_priv->id.device, id_priv->id.port_num)) {
1991                 struct rdma_dev_addr *dev_addr =
1992                         &id_priv->id.route.addr.dev_addr;
1993                 struct net_device *ndev = NULL;
1994
1995                 if (dev_addr->bound_dev_if)
1996                         ndev = dev_get_by_index(dev_addr->net,
1997                                                 dev_addr->bound_dev_if);
1998                 if (ndev && !send_only) {
1999                         enum ib_gid_type gid_type;
2000                         union ib_gid mgid;
2001
2002                         gid_type = id_priv->cma_dev->default_gid_type
2003                                            [id_priv->id.port_num -
2004                                             rdma_start_port(
2005                                                     id_priv->cma_dev->device)];
2006                         cma_iboe_set_mgid((struct sockaddr *)&mc->addr, &mgid,
2007                                           gid_type);
2008                         cma_igmp_send(ndev, &mgid, false);
2009                 }
2010                 dev_put(ndev);
2011
2012                 cancel_work_sync(&mc->iboe_join.work);
2013         }
2014         kfree(mc);
2015 }
2016
2017 static void cma_leave_mc_groups(struct rdma_id_private *id_priv)
2018 {
2019         struct cma_multicast *mc;
2020
2021         while (!list_empty(&id_priv->mc_list)) {
2022                 mc = list_first_entry(&id_priv->mc_list, struct cma_multicast,
2023                                       list);
2024                 list_del(&mc->list);
2025                 destroy_mc(id_priv, mc);
2026         }
2027 }
2028
2029 static void _destroy_id(struct rdma_id_private *id_priv,
2030                         enum rdma_cm_state state)
2031 {
2032         cma_cancel_operation(id_priv, state);
2033
2034         rdma_restrack_del(&id_priv->res);
2035         cma_remove_id_from_tree(id_priv);
2036         if (id_priv->cma_dev) {
2037                 if (rdma_cap_ib_cm(id_priv->id.device, 1)) {
2038                         if (id_priv->cm_id.ib)
2039                                 ib_destroy_cm_id(id_priv->cm_id.ib);
2040                 } else if (rdma_cap_iw_cm(id_priv->id.device, 1)) {
2041                         if (id_priv->cm_id.iw)
2042                                 iw_destroy_cm_id(id_priv->cm_id.iw);
2043                 }
2044                 cma_leave_mc_groups(id_priv);
2045                 cma_release_dev(id_priv);
2046         }
2047
2048         cma_release_port(id_priv);
2049         cma_id_put(id_priv);
2050         wait_for_completion(&id_priv->comp);
2051
2052         if (id_priv->internal_id)
2053                 cma_id_put(id_priv->id.context);
2054
2055         kfree(id_priv->id.route.path_rec);
2056         kfree(id_priv->id.route.path_rec_inbound);
2057         kfree(id_priv->id.route.path_rec_outbound);
2058
2059         put_net(id_priv->id.route.addr.dev_addr.net);
2060         kfree(id_priv);
2061 }
2062
2063 /*
2064  * destroy an ID from within the handler_mutex. This ensures that no other
2065  * handlers can start running concurrently.
2066  */
2067 static void destroy_id_handler_unlock(struct rdma_id_private *id_priv)
2068         __releases(&idprv->handler_mutex)
2069 {
2070         enum rdma_cm_state state;
2071         unsigned long flags;
2072
2073         trace_cm_id_destroy(id_priv);
2074
2075         /*
2076          * Setting the state to destroyed under the handler mutex provides a
2077          * fence against calling handler callbacks. If this is invoked due to
2078          * the failure of a handler callback then it guarentees that no future
2079          * handlers will be called.
2080          */
2081         lockdep_assert_held(&id_priv->handler_mutex);
2082         spin_lock_irqsave(&id_priv->lock, flags);
2083         state = id_priv->state;
2084         id_priv->state = RDMA_CM_DESTROYING;
2085         spin_unlock_irqrestore(&id_priv->lock, flags);
2086         mutex_unlock(&id_priv->handler_mutex);
2087         _destroy_id(id_priv, state);
2088 }
2089
2090 void rdma_destroy_id(struct rdma_cm_id *id)
2091 {
2092         struct rdma_id_private *id_priv =
2093                 container_of(id, struct rdma_id_private, id);
2094
2095         mutex_lock(&id_priv->handler_mutex);
2096         destroy_id_handler_unlock(id_priv);
2097 }
2098 EXPORT_SYMBOL(rdma_destroy_id);
2099
2100 static int cma_rep_recv(struct rdma_id_private *id_priv)
2101 {
2102         int ret;
2103
2104         ret = cma_modify_qp_rtr(id_priv, NULL);
2105         if (ret)
2106                 goto reject;
2107
2108         ret = cma_modify_qp_rts(id_priv, NULL);
2109         if (ret)
2110                 goto reject;
2111
2112         trace_cm_send_rtu(id_priv);
2113         ret = ib_send_cm_rtu(id_priv->cm_id.ib, NULL, 0);
2114         if (ret)
2115                 goto reject;
2116
2117         return 0;
2118 reject:
2119         pr_debug_ratelimited("RDMA CM: CONNECT_ERROR: failed to handle reply. status %d\n", ret);
2120         cma_modify_qp_err(id_priv);
2121         trace_cm_send_rej(id_priv);
2122         ib_send_cm_rej(id_priv->cm_id.ib, IB_CM_REJ_CONSUMER_DEFINED,
2123                        NULL, 0, NULL, 0);
2124         return ret;
2125 }
2126
2127 static void cma_set_rep_event_data(struct rdma_cm_event *event,
2128                                    const struct ib_cm_rep_event_param *rep_data,
2129                                    void *private_data)
2130 {
2131         event->param.conn.private_data = private_data;
2132         event->param.conn.private_data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
2133         event->param.conn.responder_resources = rep_data->responder_resources;
2134         event->param.conn.initiator_depth = rep_data->initiator_depth;
2135         event->param.conn.flow_control = rep_data->flow_control;
2136         event->param.conn.rnr_retry_count = rep_data->rnr_retry_count;
2137         event->param.conn.srq = rep_data->srq;
2138         event->param.conn.qp_num = rep_data->remote_qpn;
2139
2140         event->ece.vendor_id = rep_data->ece.vendor_id;
2141         event->ece.attr_mod = rep_data->ece.attr_mod;
2142 }
2143
2144 static int cma_cm_event_handler(struct rdma_id_private *id_priv,
2145                                 struct rdma_cm_event *event)
2146 {
2147         int ret;
2148
2149         lockdep_assert_held(&id_priv->handler_mutex);
2150
2151         trace_cm_event_handler(id_priv, event);
2152         ret = id_priv->id.event_handler(&id_priv->id, event);
2153         trace_cm_event_done(id_priv, event, ret);
2154         return ret;
2155 }
2156
2157 static int cma_ib_handler(struct ib_cm_id *cm_id,
2158                           const struct ib_cm_event *ib_event)
2159 {
2160         struct rdma_id_private *id_priv = cm_id->context;
2161         struct rdma_cm_event event = {};
2162         enum rdma_cm_state state;
2163         int ret;
2164
2165         mutex_lock(&id_priv->handler_mutex);
2166         state = READ_ONCE(id_priv->state);
2167         if ((ib_event->event != IB_CM_TIMEWAIT_EXIT &&
2168              state != RDMA_CM_CONNECT) ||
2169             (ib_event->event == IB_CM_TIMEWAIT_EXIT &&
2170              state != RDMA_CM_DISCONNECT))
2171                 goto out;
2172
2173         switch (ib_event->event) {
2174         case IB_CM_REQ_ERROR:
2175         case IB_CM_REP_ERROR:
2176                 event.event = RDMA_CM_EVENT_UNREACHABLE;
2177                 event.status = -ETIMEDOUT;
2178                 break;
2179         case IB_CM_REP_RECEIVED:
2180                 if (state == RDMA_CM_CONNECT &&
2181                     (id_priv->id.qp_type != IB_QPT_UD)) {
2182                         trace_cm_send_mra(id_priv);
2183                         ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
2184                 }
2185                 if (id_priv->id.qp) {
2186                         event.status = cma_rep_recv(id_priv);
2187                         event.event = event.status ? RDMA_CM_EVENT_CONNECT_ERROR :
2188                                                      RDMA_CM_EVENT_ESTABLISHED;
2189                 } else {
2190                         event.event = RDMA_CM_EVENT_CONNECT_RESPONSE;
2191                 }
2192                 cma_set_rep_event_data(&event, &ib_event->param.rep_rcvd,
2193                                        ib_event->private_data);
2194                 break;
2195         case IB_CM_RTU_RECEIVED:
2196         case IB_CM_USER_ESTABLISHED:
2197                 event.event = RDMA_CM_EVENT_ESTABLISHED;
2198                 break;
2199         case IB_CM_DREQ_ERROR:
2200                 event.status = -ETIMEDOUT;
2201                 fallthrough;
2202         case IB_CM_DREQ_RECEIVED:
2203         case IB_CM_DREP_RECEIVED:
2204                 if (!cma_comp_exch(id_priv, RDMA_CM_CONNECT,
2205                                    RDMA_CM_DISCONNECT))
2206                         goto out;
2207                 event.event = RDMA_CM_EVENT_DISCONNECTED;
2208                 break;
2209         case IB_CM_TIMEWAIT_EXIT:
2210                 event.event = RDMA_CM_EVENT_TIMEWAIT_EXIT;
2211                 break;
2212         case IB_CM_MRA_RECEIVED:
2213                 /* ignore event */
2214                 goto out;
2215         case IB_CM_REJ_RECEIVED:
2216                 pr_debug_ratelimited("RDMA CM: REJECTED: %s\n", rdma_reject_msg(&id_priv->id,
2217                                                                                 ib_event->param.rej_rcvd.reason));
2218                 cma_modify_qp_err(id_priv);
2219                 event.status = ib_event->param.rej_rcvd.reason;
2220                 event.event = RDMA_CM_EVENT_REJECTED;
2221                 event.param.conn.private_data = ib_event->private_data;
2222                 event.param.conn.private_data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
2223                 break;
2224         default:
2225                 pr_err("RDMA CMA: unexpected IB CM event: %d\n",
2226                        ib_event->event);
2227                 goto out;
2228         }
2229
2230         ret = cma_cm_event_handler(id_priv, &event);
2231         if (ret) {
2232                 /* Destroy the CM ID by returning a non-zero value. */
2233                 id_priv->cm_id.ib = NULL;
2234                 destroy_id_handler_unlock(id_priv);
2235                 return ret;
2236         }
2237 out:
2238         mutex_unlock(&id_priv->handler_mutex);
2239         return 0;
2240 }
2241
2242 static struct rdma_id_private *
2243 cma_ib_new_conn_id(const struct rdma_cm_id *listen_id,
2244                    const struct ib_cm_event *ib_event,
2245                    struct net_device *net_dev)
2246 {
2247         struct rdma_id_private *listen_id_priv;
2248         struct rdma_id_private *id_priv;
2249         struct rdma_cm_id *id;
2250         struct rdma_route *rt;
2251         const sa_family_t ss_family = listen_id->route.addr.src_addr.ss_family;
2252         struct sa_path_rec *path = ib_event->param.req_rcvd.primary_path;
2253         const __be64 service_id =
2254                 ib_event->param.req_rcvd.primary_path->service_id;
2255         int ret;
2256
2257         listen_id_priv = container_of(listen_id, struct rdma_id_private, id);
2258         id_priv = __rdma_create_id(listen_id->route.addr.dev_addr.net,
2259                                    listen_id->event_handler, listen_id->context,
2260                                    listen_id->ps,
2261                                    ib_event->param.req_rcvd.qp_type,
2262                                    listen_id_priv);
2263         if (IS_ERR(id_priv))
2264                 return NULL;
2265
2266         id = &id_priv->id;
2267         if (cma_save_net_info((struct sockaddr *)&id->route.addr.src_addr,
2268                               (struct sockaddr *)&id->route.addr.dst_addr,
2269                               listen_id, ib_event, ss_family, service_id))
2270                 goto err;
2271
2272         rt = &id->route;
2273         rt->num_pri_alt_paths = ib_event->param.req_rcvd.alternate_path ? 2 : 1;
2274         rt->path_rec = kmalloc_array(rt->num_pri_alt_paths,
2275                                      sizeof(*rt->path_rec), GFP_KERNEL);
2276         if (!rt->path_rec)
2277                 goto err;
2278
2279         rt->path_rec[0] = *path;
2280         if (rt->num_pri_alt_paths == 2)
2281                 rt->path_rec[1] = *ib_event->param.req_rcvd.alternate_path;
2282
2283         if (net_dev) {
2284                 rdma_copy_src_l2_addr(&rt->addr.dev_addr, net_dev);
2285         } else {
2286                 if (!cma_protocol_roce(listen_id) &&
2287                     cma_any_addr(cma_src_addr(id_priv))) {
2288                         rt->addr.dev_addr.dev_type = ARPHRD_INFINIBAND;
2289                         rdma_addr_set_sgid(&rt->addr.dev_addr, &rt->path_rec[0].sgid);
2290                         ib_addr_set_pkey(&rt->addr.dev_addr, be16_to_cpu(rt->path_rec[0].pkey));
2291                 } else if (!cma_any_addr(cma_src_addr(id_priv))) {
2292                         ret = cma_translate_addr(cma_src_addr(id_priv), &rt->addr.dev_addr);
2293                         if (ret)
2294                                 goto err;
2295                 }
2296         }
2297         rdma_addr_set_dgid(&rt->addr.dev_addr, &rt->path_rec[0].dgid);
2298
2299         id_priv->state = RDMA_CM_CONNECT;
2300         return id_priv;
2301
2302 err:
2303         rdma_destroy_id(id);
2304         return NULL;
2305 }
2306
2307 static struct rdma_id_private *
2308 cma_ib_new_udp_id(const struct rdma_cm_id *listen_id,
2309                   const struct ib_cm_event *ib_event,
2310                   struct net_device *net_dev)
2311 {
2312         const struct rdma_id_private *listen_id_priv;
2313         struct rdma_id_private *id_priv;
2314         struct rdma_cm_id *id;
2315         const sa_family_t ss_family = listen_id->route.addr.src_addr.ss_family;
2316         struct net *net = listen_id->route.addr.dev_addr.net;
2317         int ret;
2318
2319         listen_id_priv = container_of(listen_id, struct rdma_id_private, id);
2320         id_priv = __rdma_create_id(net, listen_id->event_handler,
2321                                    listen_id->context, listen_id->ps, IB_QPT_UD,
2322                                    listen_id_priv);
2323         if (IS_ERR(id_priv))
2324                 return NULL;
2325
2326         id = &id_priv->id;
2327         if (cma_save_net_info((struct sockaddr *)&id->route.addr.src_addr,
2328                               (struct sockaddr *)&id->route.addr.dst_addr,
2329                               listen_id, ib_event, ss_family,
2330                               ib_event->param.sidr_req_rcvd.service_id))
2331                 goto err;
2332
2333         if (net_dev) {
2334                 rdma_copy_src_l2_addr(&id->route.addr.dev_addr, net_dev);
2335         } else {
2336                 if (!cma_any_addr(cma_src_addr(id_priv))) {
2337                         ret = cma_translate_addr(cma_src_addr(id_priv),
2338                                                  &id->route.addr.dev_addr);
2339                         if (ret)
2340                                 goto err;
2341                 }
2342         }
2343
2344         id_priv->state = RDMA_CM_CONNECT;
2345         return id_priv;
2346 err:
2347         rdma_destroy_id(id);
2348         return NULL;
2349 }
2350
2351 static void cma_set_req_event_data(struct rdma_cm_event *event,
2352                                    const struct ib_cm_req_event_param *req_data,
2353                                    void *private_data, int offset)
2354 {
2355         event->param.conn.private_data = private_data + offset;
2356         event->param.conn.private_data_len = IB_CM_REQ_PRIVATE_DATA_SIZE - offset;
2357         event->param.conn.responder_resources = req_data->responder_resources;
2358         event->param.conn.initiator_depth = req_data->initiator_depth;
2359         event->param.conn.flow_control = req_data->flow_control;
2360         event->param.conn.retry_count = req_data->retry_count;
2361         event->param.conn.rnr_retry_count = req_data->rnr_retry_count;
2362         event->param.conn.srq = req_data->srq;
2363         event->param.conn.qp_num = req_data->remote_qpn;
2364
2365         event->ece.vendor_id = req_data->ece.vendor_id;
2366         event->ece.attr_mod = req_data->ece.attr_mod;
2367 }
2368
2369 static int cma_ib_check_req_qp_type(const struct rdma_cm_id *id,
2370                                     const struct ib_cm_event *ib_event)
2371 {
2372         return (((ib_event->event == IB_CM_REQ_RECEIVED) &&
2373                  (ib_event->param.req_rcvd.qp_type == id->qp_type)) ||
2374                 ((ib_event->event == IB_CM_SIDR_REQ_RECEIVED) &&
2375                  (id->qp_type == IB_QPT_UD)) ||
2376                 (!id->qp_type));
2377 }
2378
2379 static int cma_ib_req_handler(struct ib_cm_id *cm_id,
2380                               const struct ib_cm_event *ib_event)
2381 {
2382         struct rdma_id_private *listen_id, *conn_id = NULL;
2383         struct rdma_cm_event event = {};
2384         struct cma_req_info req = {};
2385         struct net_device *net_dev;
2386         u8 offset;
2387         int ret;
2388
2389         listen_id = cma_ib_id_from_event(cm_id, ib_event, &req, &net_dev);
2390         if (IS_ERR(listen_id))
2391                 return PTR_ERR(listen_id);
2392
2393         trace_cm_req_handler(listen_id, ib_event->event);
2394         if (!cma_ib_check_req_qp_type(&listen_id->id, ib_event)) {
2395                 ret = -EINVAL;
2396                 goto net_dev_put;
2397         }
2398
2399         mutex_lock(&listen_id->handler_mutex);
2400         if (READ_ONCE(listen_id->state) != RDMA_CM_LISTEN) {
2401                 ret = -ECONNABORTED;
2402                 goto err_unlock;
2403         }
2404
2405         offset = cma_user_data_offset(listen_id);
2406         event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
2407         if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED) {
2408                 conn_id = cma_ib_new_udp_id(&listen_id->id, ib_event, net_dev);
2409                 event.param.ud.private_data = ib_event->private_data + offset;
2410                 event.param.ud.private_data_len =
2411                                 IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE - offset;
2412         } else {
2413                 conn_id = cma_ib_new_conn_id(&listen_id->id, ib_event, net_dev);
2414                 cma_set_req_event_data(&event, &ib_event->param.req_rcvd,
2415                                        ib_event->private_data, offset);
2416         }
2417         if (!conn_id) {
2418                 ret = -ENOMEM;
2419                 goto err_unlock;
2420         }
2421
2422         mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
2423         ret = cma_ib_acquire_dev(conn_id, listen_id, &req);
2424         if (ret) {
2425                 destroy_id_handler_unlock(conn_id);
2426                 goto err_unlock;
2427         }
2428
2429         conn_id->cm_id.ib = cm_id;
2430         cm_id->context = conn_id;
2431         cm_id->cm_handler = cma_ib_handler;
2432
2433         ret = cma_cm_event_handler(conn_id, &event);
2434         if (ret) {
2435                 /* Destroy the CM ID by returning a non-zero value. */
2436                 conn_id->cm_id.ib = NULL;
2437                 mutex_unlock(&listen_id->handler_mutex);
2438                 destroy_id_handler_unlock(conn_id);
2439                 goto net_dev_put;
2440         }
2441
2442         if (READ_ONCE(conn_id->state) == RDMA_CM_CONNECT &&
2443             conn_id->id.qp_type != IB_QPT_UD) {
2444                 trace_cm_send_mra(cm_id->context);
2445                 ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
2446         }
2447         mutex_unlock(&conn_id->handler_mutex);
2448
2449 err_unlock:
2450         mutex_unlock(&listen_id->handler_mutex);
2451
2452 net_dev_put:
2453         dev_put(net_dev);
2454
2455         return ret;
2456 }
2457
2458 __be64 rdma_get_service_id(struct rdma_cm_id *id, struct sockaddr *addr)
2459 {
2460         if (addr->sa_family == AF_IB)
2461                 return ((struct sockaddr_ib *) addr)->sib_sid;
2462
2463         return cpu_to_be64(((u64)id->ps << 16) + be16_to_cpu(cma_port(addr)));
2464 }
2465 EXPORT_SYMBOL(rdma_get_service_id);
2466
2467 void rdma_read_gids(struct rdma_cm_id *cm_id, union ib_gid *sgid,
2468                     union ib_gid *dgid)
2469 {
2470         struct rdma_addr *addr = &cm_id->route.addr;
2471
2472         if (!cm_id->device) {
2473                 if (sgid)
2474                         memset(sgid, 0, sizeof(*sgid));
2475                 if (dgid)
2476                         memset(dgid, 0, sizeof(*dgid));
2477                 return;
2478         }
2479
2480         if (rdma_protocol_roce(cm_id->device, cm_id->port_num)) {
2481                 if (sgid)
2482                         rdma_ip2gid((struct sockaddr *)&addr->src_addr, sgid);
2483                 if (dgid)
2484                         rdma_ip2gid((struct sockaddr *)&addr->dst_addr, dgid);
2485         } else {
2486                 if (sgid)
2487                         rdma_addr_get_sgid(&addr->dev_addr, sgid);
2488                 if (dgid)
2489                         rdma_addr_get_dgid(&addr->dev_addr, dgid);
2490         }
2491 }
2492 EXPORT_SYMBOL(rdma_read_gids);
2493
2494 static int cma_iw_handler(struct iw_cm_id *iw_id, struct iw_cm_event *iw_event)
2495 {
2496         struct rdma_id_private *id_priv = iw_id->context;
2497         struct rdma_cm_event event = {};
2498         int ret = 0;
2499         struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr;
2500         struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr;
2501
2502         mutex_lock(&id_priv->handler_mutex);
2503         if (READ_ONCE(id_priv->state) != RDMA_CM_CONNECT)
2504                 goto out;
2505
2506         switch (iw_event->event) {
2507         case IW_CM_EVENT_CLOSE:
2508                 event.event = RDMA_CM_EVENT_DISCONNECTED;
2509                 break;
2510         case IW_CM_EVENT_CONNECT_REPLY:
2511                 memcpy(cma_src_addr(id_priv), laddr,
2512                        rdma_addr_size(laddr));
2513                 memcpy(cma_dst_addr(id_priv), raddr,
2514                        rdma_addr_size(raddr));
2515                 switch (iw_event->status) {
2516                 case 0:
2517                         event.event = RDMA_CM_EVENT_ESTABLISHED;
2518                         event.param.conn.initiator_depth = iw_event->ird;
2519                         event.param.conn.responder_resources = iw_event->ord;
2520                         break;
2521                 case -ECONNRESET:
2522                 case -ECONNREFUSED:
2523                         event.event = RDMA_CM_EVENT_REJECTED;
2524                         break;
2525                 case -ETIMEDOUT:
2526                         event.event = RDMA_CM_EVENT_UNREACHABLE;
2527                         break;
2528                 default:
2529                         event.event = RDMA_CM_EVENT_CONNECT_ERROR;
2530                         break;
2531                 }
2532                 break;
2533         case IW_CM_EVENT_ESTABLISHED:
2534                 event.event = RDMA_CM_EVENT_ESTABLISHED;
2535                 event.param.conn.initiator_depth = iw_event->ird;
2536                 event.param.conn.responder_resources = iw_event->ord;
2537                 break;
2538         default:
2539                 goto out;
2540         }
2541
2542         event.status = iw_event->status;
2543         event.param.conn.private_data = iw_event->private_data;
2544         event.param.conn.private_data_len = iw_event->private_data_len;
2545         ret = cma_cm_event_handler(id_priv, &event);
2546         if (ret) {
2547                 /* Destroy the CM ID by returning a non-zero value. */
2548                 id_priv->cm_id.iw = NULL;
2549                 destroy_id_handler_unlock(id_priv);
2550                 return ret;
2551         }
2552
2553 out:
2554         mutex_unlock(&id_priv->handler_mutex);
2555         return ret;
2556 }
2557
2558 static int iw_conn_req_handler(struct iw_cm_id *cm_id,
2559                                struct iw_cm_event *iw_event)
2560 {
2561         struct rdma_id_private *listen_id, *conn_id;
2562         struct rdma_cm_event event = {};
2563         int ret = -ECONNABORTED;
2564         struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr;
2565         struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr;
2566
2567         event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
2568         event.param.conn.private_data = iw_event->private_data;
2569         event.param.conn.private_data_len = iw_event->private_data_len;
2570         event.param.conn.initiator_depth = iw_event->ird;
2571         event.param.conn.responder_resources = iw_event->ord;
2572
2573         listen_id = cm_id->context;
2574
2575         mutex_lock(&listen_id->handler_mutex);
2576         if (READ_ONCE(listen_id->state) != RDMA_CM_LISTEN)
2577                 goto out;
2578
2579         /* Create a new RDMA id for the new IW CM ID */
2580         conn_id = __rdma_create_id(listen_id->id.route.addr.dev_addr.net,
2581                                    listen_id->id.event_handler,
2582                                    listen_id->id.context, RDMA_PS_TCP,
2583                                    IB_QPT_RC, listen_id);
2584         if (IS_ERR(conn_id)) {
2585                 ret = -ENOMEM;
2586                 goto out;
2587         }
2588         mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
2589         conn_id->state = RDMA_CM_CONNECT;
2590
2591         ret = rdma_translate_ip(laddr, &conn_id->id.route.addr.dev_addr);
2592         if (ret) {
2593                 mutex_unlock(&listen_id->handler_mutex);
2594                 destroy_id_handler_unlock(conn_id);
2595                 return ret;
2596         }
2597
2598         ret = cma_iw_acquire_dev(conn_id, listen_id);
2599         if (ret) {
2600                 mutex_unlock(&listen_id->handler_mutex);
2601                 destroy_id_handler_unlock(conn_id);
2602                 return ret;
2603         }
2604
2605         conn_id->cm_id.iw = cm_id;
2606         cm_id->context = conn_id;
2607         cm_id->cm_handler = cma_iw_handler;
2608
2609         memcpy(cma_src_addr(conn_id), laddr, rdma_addr_size(laddr));
2610         memcpy(cma_dst_addr(conn_id), raddr, rdma_addr_size(raddr));
2611
2612         ret = cma_cm_event_handler(conn_id, &event);
2613         if (ret) {
2614                 /* User wants to destroy the CM ID */
2615                 conn_id->cm_id.iw = NULL;
2616                 mutex_unlock(&listen_id->handler_mutex);
2617                 destroy_id_handler_unlock(conn_id);
2618                 return ret;
2619         }
2620
2621         mutex_unlock(&conn_id->handler_mutex);
2622
2623 out:
2624         mutex_unlock(&listen_id->handler_mutex);
2625         return ret;
2626 }
2627
2628 static int cma_ib_listen(struct rdma_id_private *id_priv)
2629 {
2630         struct sockaddr *addr;
2631         struct ib_cm_id *id;
2632         __be64 svc_id;
2633
2634         addr = cma_src_addr(id_priv);
2635         svc_id = rdma_get_service_id(&id_priv->id, addr);
2636         id = ib_cm_insert_listen(id_priv->id.device,
2637                                  cma_ib_req_handler, svc_id);
2638         if (IS_ERR(id))
2639                 return PTR_ERR(id);
2640         id_priv->cm_id.ib = id;
2641
2642         return 0;
2643 }
2644
2645 static int cma_iw_listen(struct rdma_id_private *id_priv, int backlog)
2646 {
2647         int ret;
2648         struct iw_cm_id *id;
2649
2650         id = iw_create_cm_id(id_priv->id.device,
2651                              iw_conn_req_handler,
2652                              id_priv);
2653         if (IS_ERR(id))
2654                 return PTR_ERR(id);
2655
2656         mutex_lock(&id_priv->qp_mutex);
2657         id->tos = id_priv->tos;
2658         id->tos_set = id_priv->tos_set;
2659         mutex_unlock(&id_priv->qp_mutex);
2660         id->afonly = id_priv->afonly;
2661         id_priv->cm_id.iw = id;
2662
2663         memcpy(&id_priv->cm_id.iw->local_addr, cma_src_addr(id_priv),
2664                rdma_addr_size(cma_src_addr(id_priv)));
2665
2666         ret = iw_cm_listen(id_priv->cm_id.iw, backlog);
2667
2668         if (ret) {
2669                 iw_destroy_cm_id(id_priv->cm_id.iw);
2670                 id_priv->cm_id.iw = NULL;
2671         }
2672
2673         return ret;
2674 }
2675
2676 static int cma_listen_handler(struct rdma_cm_id *id,
2677                               struct rdma_cm_event *event)
2678 {
2679         struct rdma_id_private *id_priv = id->context;
2680
2681         /* Listening IDs are always destroyed on removal */
2682         if (event->event == RDMA_CM_EVENT_DEVICE_REMOVAL)
2683                 return -1;
2684
2685         id->context = id_priv->id.context;
2686         id->event_handler = id_priv->id.event_handler;
2687         trace_cm_event_handler(id_priv, event);
2688         return id_priv->id.event_handler(id, event);
2689 }
2690
2691 static int cma_listen_on_dev(struct rdma_id_private *id_priv,
2692                              struct cma_device *cma_dev,
2693                              struct rdma_id_private **to_destroy)
2694 {
2695         struct rdma_id_private *dev_id_priv;
2696         struct net *net = id_priv->id.route.addr.dev_addr.net;
2697         int ret;
2698
2699         lockdep_assert_held(&lock);
2700
2701         *to_destroy = NULL;
2702         if (cma_family(id_priv) == AF_IB && !rdma_cap_ib_cm(cma_dev->device, 1))
2703                 return 0;
2704
2705         dev_id_priv =
2706                 __rdma_create_id(net, cma_listen_handler, id_priv,
2707                                  id_priv->id.ps, id_priv->id.qp_type, id_priv);
2708         if (IS_ERR(dev_id_priv))
2709                 return PTR_ERR(dev_id_priv);
2710
2711         dev_id_priv->state = RDMA_CM_ADDR_BOUND;
2712         memcpy(cma_src_addr(dev_id_priv), cma_src_addr(id_priv),
2713                rdma_addr_size(cma_src_addr(id_priv)));
2714
2715         _cma_attach_to_dev(dev_id_priv, cma_dev);
2716         rdma_restrack_add(&dev_id_priv->res);
2717         cma_id_get(id_priv);
2718         dev_id_priv->internal_id = 1;
2719         dev_id_priv->afonly = id_priv->afonly;
2720         mutex_lock(&id_priv->qp_mutex);
2721         dev_id_priv->tos_set = id_priv->tos_set;
2722         dev_id_priv->tos = id_priv->tos;
2723         mutex_unlock(&id_priv->qp_mutex);
2724
2725         ret = rdma_listen(&dev_id_priv->id, id_priv->backlog);
2726         if (ret)
2727                 goto err_listen;
2728         list_add_tail(&dev_id_priv->listen_item, &id_priv->listen_list);
2729         return 0;
2730 err_listen:
2731         /* Caller must destroy this after releasing lock */
2732         *to_destroy = dev_id_priv;
2733         dev_warn(&cma_dev->device->dev, "RDMA CMA: %s, error %d\n", __func__, ret);
2734         return ret;
2735 }
2736
2737 static int cma_listen_on_all(struct rdma_id_private *id_priv)
2738 {
2739         struct rdma_id_private *to_destroy;
2740         struct cma_device *cma_dev;
2741         int ret;
2742
2743         mutex_lock(&lock);
2744         list_add_tail(&id_priv->listen_any_item, &listen_any_list);
2745         list_for_each_entry(cma_dev, &dev_list, list) {
2746                 ret = cma_listen_on_dev(id_priv, cma_dev, &to_destroy);
2747                 if (ret) {
2748                         /* Prevent racing with cma_process_remove() */
2749                         if (to_destroy)
2750                                 list_del_init(&to_destroy->device_item);
2751                         goto err_listen;
2752                 }
2753         }
2754         mutex_unlock(&lock);
2755         return 0;
2756
2757 err_listen:
2758         _cma_cancel_listens(id_priv);
2759         mutex_unlock(&lock);
2760         if (to_destroy)
2761                 rdma_destroy_id(&to_destroy->id);
2762         return ret;
2763 }
2764
2765 void rdma_set_service_type(struct rdma_cm_id *id, int tos)
2766 {
2767         struct rdma_id_private *id_priv;
2768
2769         id_priv = container_of(id, struct rdma_id_private, id);
2770         mutex_lock(&id_priv->qp_mutex);
2771         id_priv->tos = (u8) tos;
2772         id_priv->tos_set = true;
2773         mutex_unlock(&id_priv->qp_mutex);
2774 }
2775 EXPORT_SYMBOL(rdma_set_service_type);
2776
2777 /**
2778  * rdma_set_ack_timeout() - Set the ack timeout of QP associated
2779  *                          with a connection identifier.
2780  * @id: Communication identifier to associated with service type.
2781  * @timeout: Ack timeout to set a QP, expressed as 4.096 * 2^(timeout) usec.
2782  *
2783  * This function should be called before rdma_connect() on active side,
2784  * and on passive side before rdma_accept(). It is applicable to primary
2785  * path only. The timeout will affect the local side of the QP, it is not
2786  * negotiated with remote side and zero disables the timer. In case it is
2787  * set before rdma_resolve_route, the value will also be used to determine
2788  * PacketLifeTime for RoCE.
2789  *
2790  * Return: 0 for success
2791  */
2792 int rdma_set_ack_timeout(struct rdma_cm_id *id, u8 timeout)
2793 {
2794         struct rdma_id_private *id_priv;
2795
2796         if (id->qp_type != IB_QPT_RC && id->qp_type != IB_QPT_XRC_INI)
2797                 return -EINVAL;
2798
2799         id_priv = container_of(id, struct rdma_id_private, id);
2800         mutex_lock(&id_priv->qp_mutex);
2801         id_priv->timeout = timeout;
2802         id_priv->timeout_set = true;
2803         mutex_unlock(&id_priv->qp_mutex);
2804
2805         return 0;
2806 }
2807 EXPORT_SYMBOL(rdma_set_ack_timeout);
2808
2809 /**
2810  * rdma_set_min_rnr_timer() - Set the minimum RNR Retry timer of the
2811  *                            QP associated with a connection identifier.
2812  * @id: Communication identifier to associated with service type.
2813  * @min_rnr_timer: 5-bit value encoded as Table 45: "Encoding for RNR NAK
2814  *                 Timer Field" in the IBTA specification.
2815  *
2816  * This function should be called before rdma_connect() on active
2817  * side, and on passive side before rdma_accept(). The timer value
2818  * will be associated with the local QP. When it receives a send it is
2819  * not read to handle, typically if the receive queue is empty, an RNR
2820  * Retry NAK is returned to the requester with the min_rnr_timer
2821  * encoded. The requester will then wait at least the time specified
2822  * in the NAK before retrying. The default is zero, which translates
2823  * to a minimum RNR Timer value of 655 ms.
2824  *
2825  * Return: 0 for success
2826  */
2827 int rdma_set_min_rnr_timer(struct rdma_cm_id *id, u8 min_rnr_timer)
2828 {
2829         struct rdma_id_private *id_priv;
2830
2831         /* It is a five-bit value */
2832         if (min_rnr_timer & 0xe0)
2833                 return -EINVAL;
2834
2835         if (WARN_ON(id->qp_type != IB_QPT_RC && id->qp_type != IB_QPT_XRC_TGT))
2836                 return -EINVAL;
2837
2838         id_priv = container_of(id, struct rdma_id_private, id);
2839         mutex_lock(&id_priv->qp_mutex);
2840         id_priv->min_rnr_timer = min_rnr_timer;
2841         id_priv->min_rnr_timer_set = true;
2842         mutex_unlock(&id_priv->qp_mutex);
2843
2844         return 0;
2845 }
2846 EXPORT_SYMBOL(rdma_set_min_rnr_timer);
2847
2848 static int route_set_path_rec_inbound(struct cma_work *work,
2849                                       struct sa_path_rec *path_rec)
2850 {
2851         struct rdma_route *route = &work->id->id.route;
2852
2853         if (!route->path_rec_inbound) {
2854                 route->path_rec_inbound =
2855                         kzalloc(sizeof(*route->path_rec_inbound), GFP_KERNEL);
2856                 if (!route->path_rec_inbound)
2857                         return -ENOMEM;
2858         }
2859
2860         *route->path_rec_inbound = *path_rec;
2861         return 0;
2862 }
2863
2864 static int route_set_path_rec_outbound(struct cma_work *work,
2865                                        struct sa_path_rec *path_rec)
2866 {
2867         struct rdma_route *route = &work->id->id.route;
2868
2869         if (!route->path_rec_outbound) {
2870                 route->path_rec_outbound =
2871                         kzalloc(sizeof(*route->path_rec_outbound), GFP_KERNEL);
2872                 if (!route->path_rec_outbound)
2873                         return -ENOMEM;
2874         }
2875
2876         *route->path_rec_outbound = *path_rec;
2877         return 0;
2878 }
2879
2880 static void cma_query_handler(int status, struct sa_path_rec *path_rec,
2881                               unsigned int num_prs, void *context)
2882 {
2883         struct cma_work *work = context;
2884         struct rdma_route *route;
2885         int i;
2886
2887         route = &work->id->id.route;
2888
2889         if (status)
2890                 goto fail;
2891
2892         for (i = 0; i < num_prs; i++) {
2893                 if (!path_rec[i].flags || (path_rec[i].flags & IB_PATH_GMP))
2894                         *route->path_rec = path_rec[i];
2895                 else if (path_rec[i].flags & IB_PATH_INBOUND)
2896                         status = route_set_path_rec_inbound(work, &path_rec[i]);
2897                 else if (path_rec[i].flags & IB_PATH_OUTBOUND)
2898                         status = route_set_path_rec_outbound(work,
2899                                                              &path_rec[i]);
2900                 else
2901                         status = -EINVAL;
2902
2903                 if (status)
2904                         goto fail;
2905         }
2906
2907         route->num_pri_alt_paths = 1;
2908         queue_work(cma_wq, &work->work);
2909         return;
2910
2911 fail:
2912         work->old_state = RDMA_CM_ROUTE_QUERY;
2913         work->new_state = RDMA_CM_ADDR_RESOLVED;
2914         work->event.event = RDMA_CM_EVENT_ROUTE_ERROR;
2915         work->event.status = status;
2916         pr_debug_ratelimited("RDMA CM: ROUTE_ERROR: failed to query path. status %d\n",
2917                              status);
2918         queue_work(cma_wq, &work->work);
2919 }
2920
2921 static int cma_query_ib_route(struct rdma_id_private *id_priv,
2922                               unsigned long timeout_ms, struct cma_work *work)
2923 {
2924         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
2925         struct sa_path_rec path_rec;
2926         ib_sa_comp_mask comp_mask;
2927         struct sockaddr_in6 *sin6;
2928         struct sockaddr_ib *sib;
2929
2930         memset(&path_rec, 0, sizeof path_rec);
2931
2932         if (rdma_cap_opa_ah(id_priv->id.device, id_priv->id.port_num))
2933                 path_rec.rec_type = SA_PATH_REC_TYPE_OPA;
2934         else
2935                 path_rec.rec_type = SA_PATH_REC_TYPE_IB;
2936         rdma_addr_get_sgid(dev_addr, &path_rec.sgid);
2937         rdma_addr_get_dgid(dev_addr, &path_rec.dgid);
2938         path_rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
2939         path_rec.numb_path = 1;
2940         path_rec.reversible = 1;
2941         path_rec.service_id = rdma_get_service_id(&id_priv->id,
2942                                                   cma_dst_addr(id_priv));
2943
2944         comp_mask = IB_SA_PATH_REC_DGID | IB_SA_PATH_REC_SGID |
2945                     IB_SA_PATH_REC_PKEY | IB_SA_PATH_REC_NUMB_PATH |
2946                     IB_SA_PATH_REC_REVERSIBLE | IB_SA_PATH_REC_SERVICE_ID;
2947
2948         switch (cma_family(id_priv)) {
2949         case AF_INET:
2950                 path_rec.qos_class = cpu_to_be16((u16) id_priv->tos);
2951                 comp_mask |= IB_SA_PATH_REC_QOS_CLASS;
2952                 break;
2953         case AF_INET6:
2954                 sin6 = (struct sockaddr_in6 *) cma_src_addr(id_priv);
2955                 path_rec.traffic_class = (u8) (be32_to_cpu(sin6->sin6_flowinfo) >> 20);
2956                 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
2957                 break;
2958         case AF_IB:
2959                 sib = (struct sockaddr_ib *) cma_src_addr(id_priv);
2960                 path_rec.traffic_class = (u8) (be32_to_cpu(sib->sib_flowinfo) >> 20);
2961                 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
2962                 break;
2963         }
2964
2965         id_priv->query_id = ib_sa_path_rec_get(&sa_client, id_priv->id.device,
2966                                                id_priv->id.port_num, &path_rec,
2967                                                comp_mask, timeout_ms,
2968                                                GFP_KERNEL, cma_query_handler,
2969                                                work, &id_priv->query);
2970
2971         return (id_priv->query_id < 0) ? id_priv->query_id : 0;
2972 }
2973
2974 static void cma_iboe_join_work_handler(struct work_struct *work)
2975 {
2976         struct cma_multicast *mc =
2977                 container_of(work, struct cma_multicast, iboe_join.work);
2978         struct rdma_cm_event *event = &mc->iboe_join.event;
2979         struct rdma_id_private *id_priv = mc->id_priv;
2980         int ret;
2981
2982         mutex_lock(&id_priv->handler_mutex);
2983         if (READ_ONCE(id_priv->state) == RDMA_CM_DESTROYING ||
2984             READ_ONCE(id_priv->state) == RDMA_CM_DEVICE_REMOVAL)
2985                 goto out_unlock;
2986
2987         ret = cma_cm_event_handler(id_priv, event);
2988         WARN_ON(ret);
2989
2990 out_unlock:
2991         mutex_unlock(&id_priv->handler_mutex);
2992         if (event->event == RDMA_CM_EVENT_MULTICAST_JOIN)
2993                 rdma_destroy_ah_attr(&event->param.ud.ah_attr);
2994 }
2995
2996 static void cma_work_handler(struct work_struct *_work)
2997 {
2998         struct cma_work *work = container_of(_work, struct cma_work, work);
2999         struct rdma_id_private *id_priv = work->id;
3000
3001         mutex_lock(&id_priv->handler_mutex);
3002         if (READ_ONCE(id_priv->state) == RDMA_CM_DESTROYING ||
3003             READ_ONCE(id_priv->state) == RDMA_CM_DEVICE_REMOVAL)
3004                 goto out_unlock;
3005         if (work->old_state != 0 || work->new_state != 0) {
3006                 if (!cma_comp_exch(id_priv, work->old_state, work->new_state))
3007                         goto out_unlock;
3008         }
3009
3010         if (cma_cm_event_handler(id_priv, &work->event)) {
3011                 cma_id_put(id_priv);
3012                 destroy_id_handler_unlock(id_priv);
3013                 goto out_free;
3014         }
3015
3016 out_unlock:
3017         mutex_unlock(&id_priv->handler_mutex);
3018         cma_id_put(id_priv);
3019 out_free:
3020         if (work->event.event == RDMA_CM_EVENT_MULTICAST_JOIN)
3021                 rdma_destroy_ah_attr(&work->event.param.ud.ah_attr);
3022         kfree(work);
3023 }
3024
3025 static void cma_init_resolve_route_work(struct cma_work *work,
3026                                         struct rdma_id_private *id_priv)
3027 {
3028         work->id = id_priv;
3029         INIT_WORK(&work->work, cma_work_handler);
3030         work->old_state = RDMA_CM_ROUTE_QUERY;
3031         work->new_state = RDMA_CM_ROUTE_RESOLVED;
3032         work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
3033 }
3034
3035 static void enqueue_resolve_addr_work(struct cma_work *work,
3036                                       struct rdma_id_private *id_priv)
3037 {
3038         /* Balances with cma_id_put() in cma_work_handler */
3039         cma_id_get(id_priv);
3040
3041         work->id = id_priv;
3042         INIT_WORK(&work->work, cma_work_handler);
3043         work->old_state = RDMA_CM_ADDR_QUERY;
3044         work->new_state = RDMA_CM_ADDR_RESOLVED;
3045         work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
3046
3047         queue_work(cma_wq, &work->work);
3048 }
3049
3050 static int cma_resolve_ib_route(struct rdma_id_private *id_priv,
3051                                 unsigned long timeout_ms)
3052 {
3053         struct rdma_route *route = &id_priv->id.route;
3054         struct cma_work *work;
3055         int ret;
3056
3057         work = kzalloc(sizeof *work, GFP_KERNEL);
3058         if (!work)
3059                 return -ENOMEM;
3060
3061         cma_init_resolve_route_work(work, id_priv);
3062
3063         if (!route->path_rec)
3064                 route->path_rec = kmalloc(sizeof *route->path_rec, GFP_KERNEL);
3065         if (!route->path_rec) {
3066                 ret = -ENOMEM;
3067                 goto err1;
3068         }
3069
3070         ret = cma_query_ib_route(id_priv, timeout_ms, work);
3071         if (ret)
3072                 goto err2;
3073
3074         return 0;
3075 err2:
3076         kfree(route->path_rec);
3077         route->path_rec = NULL;
3078 err1:
3079         kfree(work);
3080         return ret;
3081 }
3082
3083 static enum ib_gid_type cma_route_gid_type(enum rdma_network_type network_type,
3084                                            unsigned long supported_gids,
3085                                            enum ib_gid_type default_gid)
3086 {
3087         if ((network_type == RDMA_NETWORK_IPV4 ||
3088              network_type == RDMA_NETWORK_IPV6) &&
3089             test_bit(IB_GID_TYPE_ROCE_UDP_ENCAP, &supported_gids))
3090                 return IB_GID_TYPE_ROCE_UDP_ENCAP;
3091
3092         return default_gid;
3093 }
3094
3095 /*
3096  * cma_iboe_set_path_rec_l2_fields() is helper function which sets
3097  * path record type based on GID type.
3098  * It also sets up other L2 fields which includes destination mac address
3099  * netdev ifindex, of the path record.
3100  * It returns the netdev of the bound interface for this path record entry.
3101  */
3102 static struct net_device *
3103 cma_iboe_set_path_rec_l2_fields(struct rdma_id_private *id_priv)
3104 {
3105         struct rdma_route *route = &id_priv->id.route;
3106         enum ib_gid_type gid_type = IB_GID_TYPE_ROCE;
3107         struct rdma_addr *addr = &route->addr;
3108         unsigned long supported_gids;
3109         struct net_device *ndev;
3110
3111         if (!addr->dev_addr.bound_dev_if)
3112                 return NULL;
3113
3114         ndev = dev_get_by_index(addr->dev_addr.net,
3115                                 addr->dev_addr.bound_dev_if);
3116         if (!ndev)
3117                 return NULL;
3118
3119         supported_gids = roce_gid_type_mask_support(id_priv->id.device,
3120                                                     id_priv->id.port_num);
3121         gid_type = cma_route_gid_type(addr->dev_addr.network,
3122                                       supported_gids,
3123                                       id_priv->gid_type);
3124         /* Use the hint from IP Stack to select GID Type */
3125         if (gid_type < ib_network_to_gid_type(addr->dev_addr.network))
3126                 gid_type = ib_network_to_gid_type(addr->dev_addr.network);
3127         route->path_rec->rec_type = sa_conv_gid_to_pathrec_type(gid_type);
3128
3129         route->path_rec->roce.route_resolved = true;
3130         sa_path_set_dmac(route->path_rec, addr->dev_addr.dst_dev_addr);
3131         return ndev;
3132 }
3133
3134 int rdma_set_ib_path(struct rdma_cm_id *id,
3135                      struct sa_path_rec *path_rec)
3136 {
3137         struct rdma_id_private *id_priv;
3138         struct net_device *ndev;
3139         int ret;
3140
3141         id_priv = container_of(id, struct rdma_id_private, id);
3142         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
3143                            RDMA_CM_ROUTE_RESOLVED))
3144                 return -EINVAL;
3145
3146         id->route.path_rec = kmemdup(path_rec, sizeof(*path_rec),
3147                                      GFP_KERNEL);
3148         if (!id->route.path_rec) {
3149                 ret = -ENOMEM;
3150                 goto err;
3151         }
3152
3153         if (rdma_protocol_roce(id->device, id->port_num)) {
3154                 ndev = cma_iboe_set_path_rec_l2_fields(id_priv);
3155                 if (!ndev) {
3156                         ret = -ENODEV;
3157                         goto err_free;
3158                 }
3159                 dev_put(ndev);
3160         }
3161
3162         id->route.num_pri_alt_paths = 1;
3163         return 0;
3164
3165 err_free:
3166         kfree(id->route.path_rec);
3167         id->route.path_rec = NULL;
3168 err:
3169         cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_ADDR_RESOLVED);
3170         return ret;
3171 }
3172 EXPORT_SYMBOL(rdma_set_ib_path);
3173
3174 static int cma_resolve_iw_route(struct rdma_id_private *id_priv)
3175 {
3176         struct cma_work *work;
3177
3178         work = kzalloc(sizeof *work, GFP_KERNEL);
3179         if (!work)
3180                 return -ENOMEM;
3181
3182         cma_init_resolve_route_work(work, id_priv);
3183         queue_work(cma_wq, &work->work);
3184         return 0;
3185 }
3186
3187 static int get_vlan_ndev_tc(struct net_device *vlan_ndev, int prio)
3188 {
3189         struct net_device *dev;
3190
3191         dev = vlan_dev_real_dev(vlan_ndev);
3192         if (dev->num_tc)
3193                 return netdev_get_prio_tc_map(dev, prio);
3194
3195         return (vlan_dev_get_egress_qos_mask(vlan_ndev, prio) &
3196                 VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
3197 }
3198
3199 struct iboe_prio_tc_map {
3200         int input_prio;
3201         int output_tc;
3202         bool found;
3203 };
3204
3205 static int get_lower_vlan_dev_tc(struct net_device *dev,
3206                                  struct netdev_nested_priv *priv)
3207 {
3208         struct iboe_prio_tc_map *map = (struct iboe_prio_tc_map *)priv->data;
3209
3210         if (is_vlan_dev(dev))
3211                 map->output_tc = get_vlan_ndev_tc(dev, map->input_prio);
3212         else if (dev->num_tc)
3213                 map->output_tc = netdev_get_prio_tc_map(dev, map->input_prio);
3214         else
3215                 map->output_tc = 0;
3216         /* We are interested only in first level VLAN device, so always
3217          * return 1 to stop iterating over next level devices.
3218          */
3219         map->found = true;
3220         return 1;
3221 }
3222
3223 static int iboe_tos_to_sl(struct net_device *ndev, int tos)
3224 {
3225         struct iboe_prio_tc_map prio_tc_map = {};
3226         int prio = rt_tos2priority(tos);
3227         struct netdev_nested_priv priv;
3228
3229         /* If VLAN device, get it directly from the VLAN netdev */
3230         if (is_vlan_dev(ndev))
3231                 return get_vlan_ndev_tc(ndev, prio);
3232
3233         prio_tc_map.input_prio = prio;
3234         priv.data = (void *)&prio_tc_map;
3235         rcu_read_lock();
3236         netdev_walk_all_lower_dev_rcu(ndev,
3237                                       get_lower_vlan_dev_tc,
3238                                       &priv);
3239         rcu_read_unlock();
3240         /* If map is found from lower device, use it; Otherwise
3241          * continue with the current netdevice to get priority to tc map.
3242          */
3243         if (prio_tc_map.found)
3244                 return prio_tc_map.output_tc;
3245         else if (ndev->num_tc)
3246                 return netdev_get_prio_tc_map(ndev, prio);
3247         else
3248                 return 0;
3249 }
3250
3251 static __be32 cma_get_roce_udp_flow_label(struct rdma_id_private *id_priv)
3252 {
3253         struct sockaddr_in6 *addr6;
3254         u16 dport, sport;
3255         u32 hash, fl;
3256
3257         addr6 = (struct sockaddr_in6 *)cma_src_addr(id_priv);
3258         fl = be32_to_cpu(addr6->sin6_flowinfo) & IB_GRH_FLOWLABEL_MASK;
3259         if ((cma_family(id_priv) != AF_INET6) || !fl) {
3260                 dport = be16_to_cpu(cma_port(cma_dst_addr(id_priv)));
3261                 sport = be16_to_cpu(cma_port(cma_src_addr(id_priv)));
3262                 hash = (u32)sport * 31 + dport;
3263                 fl = hash & IB_GRH_FLOWLABEL_MASK;
3264         }
3265
3266         return cpu_to_be32(fl);
3267 }
3268
3269 static int cma_resolve_iboe_route(struct rdma_id_private *id_priv)
3270 {
3271         struct rdma_route *route = &id_priv->id.route;
3272         struct rdma_addr *addr = &route->addr;
3273         struct cma_work *work;
3274         int ret;
3275         struct net_device *ndev;
3276
3277         u8 default_roce_tos = id_priv->cma_dev->default_roce_tos[id_priv->id.port_num -
3278                                         rdma_start_port(id_priv->cma_dev->device)];
3279         u8 tos;
3280
3281         mutex_lock(&id_priv->qp_mutex);
3282         tos = id_priv->tos_set ? id_priv->tos : default_roce_tos;
3283         mutex_unlock(&id_priv->qp_mutex);
3284
3285         work = kzalloc(sizeof *work, GFP_KERNEL);
3286         if (!work)
3287                 return -ENOMEM;
3288
3289         route->path_rec = kzalloc(sizeof *route->path_rec, GFP_KERNEL);
3290         if (!route->path_rec) {
3291                 ret = -ENOMEM;
3292                 goto err1;
3293         }
3294
3295         route->num_pri_alt_paths = 1;
3296
3297         ndev = cma_iboe_set_path_rec_l2_fields(id_priv);
3298         if (!ndev) {
3299                 ret = -ENODEV;
3300                 goto err2;
3301         }
3302
3303         rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
3304                     &route->path_rec->sgid);
3305         rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.dst_addr,
3306                     &route->path_rec->dgid);
3307
3308         if (((struct sockaddr *)&id_priv->id.route.addr.dst_addr)->sa_family != AF_IB)
3309                 /* TODO: get the hoplimit from the inet/inet6 device */
3310                 route->path_rec->hop_limit = addr->dev_addr.hoplimit;
3311         else
3312                 route->path_rec->hop_limit = 1;
3313         route->path_rec->reversible = 1;
3314         route->path_rec->pkey = cpu_to_be16(0xffff);
3315         route->path_rec->mtu_selector = IB_SA_EQ;
3316         route->path_rec->sl = iboe_tos_to_sl(ndev, tos);
3317         route->path_rec->traffic_class = tos;
3318         route->path_rec->mtu = iboe_get_mtu(ndev->mtu);
3319         route->path_rec->rate_selector = IB_SA_EQ;
3320         route->path_rec->rate = IB_RATE_PORT_CURRENT;
3321         dev_put(ndev);
3322         route->path_rec->packet_life_time_selector = IB_SA_EQ;
3323         /* In case ACK timeout is set, use this value to calculate
3324          * PacketLifeTime.  As per IBTA 12.7.34,
3325          * local ACK timeout = (2 * PacketLifeTime + Local CA’s ACK delay).
3326          * Assuming a negligible local ACK delay, we can use
3327          * PacketLifeTime = local ACK timeout/2
3328          * as a reasonable approximation for RoCE networks.
3329          */
3330         mutex_lock(&id_priv->qp_mutex);
3331         if (id_priv->timeout_set && id_priv->timeout)
3332                 route->path_rec->packet_life_time = id_priv->timeout - 1;
3333         else
3334                 route->path_rec->packet_life_time = CMA_IBOE_PACKET_LIFETIME;
3335         mutex_unlock(&id_priv->qp_mutex);
3336
3337         if (!route->path_rec->mtu) {
3338                 ret = -EINVAL;
3339                 goto err2;
3340         }
3341
3342         if (rdma_protocol_roce_udp_encap(id_priv->id.device,
3343                                          id_priv->id.port_num))
3344                 route->path_rec->flow_label =
3345                         cma_get_roce_udp_flow_label(id_priv);
3346
3347         cma_init_resolve_route_work(work, id_priv);
3348         queue_work(cma_wq, &work->work);
3349
3350         return 0;
3351
3352 err2:
3353         kfree(route->path_rec);
3354         route->path_rec = NULL;
3355         route->num_pri_alt_paths = 0;
3356 err1:
3357         kfree(work);
3358         return ret;
3359 }
3360
3361 int rdma_resolve_route(struct rdma_cm_id *id, unsigned long timeout_ms)
3362 {
3363         struct rdma_id_private *id_priv;
3364         int ret;
3365
3366         if (!timeout_ms)
3367                 return -EINVAL;
3368
3369         id_priv = container_of(id, struct rdma_id_private, id);
3370         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED, RDMA_CM_ROUTE_QUERY))
3371                 return -EINVAL;
3372
3373         cma_id_get(id_priv);
3374         if (rdma_cap_ib_sa(id->device, id->port_num))
3375                 ret = cma_resolve_ib_route(id_priv, timeout_ms);
3376         else if (rdma_protocol_roce(id->device, id->port_num)) {
3377                 ret = cma_resolve_iboe_route(id_priv);
3378                 if (!ret)
3379                         cma_add_id_to_tree(id_priv);
3380         }
3381         else if (rdma_protocol_iwarp(id->device, id->port_num))
3382                 ret = cma_resolve_iw_route(id_priv);
3383         else
3384                 ret = -ENOSYS;
3385
3386         if (ret)
3387                 goto err;
3388
3389         return 0;
3390 err:
3391         cma_comp_exch(id_priv, RDMA_CM_ROUTE_QUERY, RDMA_CM_ADDR_RESOLVED);
3392         cma_id_put(id_priv);
3393         return ret;
3394 }
3395 EXPORT_SYMBOL(rdma_resolve_route);
3396
3397 static void cma_set_loopback(struct sockaddr *addr)
3398 {
3399         switch (addr->sa_family) {
3400         case AF_INET:
3401                 ((struct sockaddr_in *) addr)->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
3402                 break;
3403         case AF_INET6:
3404                 ipv6_addr_set(&((struct sockaddr_in6 *) addr)->sin6_addr,
3405                               0, 0, 0, htonl(1));
3406                 break;
3407         default:
3408                 ib_addr_set(&((struct sockaddr_ib *) addr)->sib_addr,
3409                             0, 0, 0, htonl(1));
3410                 break;
3411         }
3412 }
3413
3414 static int cma_bind_loopback(struct rdma_id_private *id_priv)
3415 {
3416         struct cma_device *cma_dev, *cur_dev;
3417         union ib_gid gid;
3418         enum ib_port_state port_state;
3419         unsigned int p;
3420         u16 pkey;
3421         int ret;
3422
3423         cma_dev = NULL;
3424         mutex_lock(&lock);
3425         list_for_each_entry(cur_dev, &dev_list, list) {
3426                 if (cma_family(id_priv) == AF_IB &&
3427                     !rdma_cap_ib_cm(cur_dev->device, 1))
3428                         continue;
3429
3430                 if (!cma_dev)
3431                         cma_dev = cur_dev;
3432
3433                 rdma_for_each_port (cur_dev->device, p) {
3434                         if (!ib_get_cached_port_state(cur_dev->device, p, &port_state) &&
3435                             port_state == IB_PORT_ACTIVE) {
3436                                 cma_dev = cur_dev;
3437                                 goto port_found;
3438                         }
3439                 }
3440         }
3441
3442         if (!cma_dev) {
3443                 ret = -ENODEV;
3444                 goto out;
3445         }
3446
3447         p = 1;
3448
3449 port_found:
3450         ret = rdma_query_gid(cma_dev->device, p, 0, &gid);
3451         if (ret)
3452                 goto out;
3453
3454         ret = ib_get_cached_pkey(cma_dev->device, p, 0, &pkey);
3455         if (ret)
3456                 goto out;
3457
3458         id_priv->id.route.addr.dev_addr.dev_type =
3459                 (rdma_protocol_ib(cma_dev->device, p)) ?
3460                 ARPHRD_INFINIBAND : ARPHRD_ETHER;
3461
3462         rdma_addr_set_sgid(&id_priv->id.route.addr.dev_addr, &gid);
3463         ib_addr_set_pkey(&id_priv->id.route.addr.dev_addr, pkey);
3464         id_priv->id.port_num = p;
3465         cma_attach_to_dev(id_priv, cma_dev);
3466         rdma_restrack_add(&id_priv->res);
3467         cma_set_loopback(cma_src_addr(id_priv));
3468 out:
3469         mutex_unlock(&lock);
3470         return ret;
3471 }
3472
3473 static void addr_handler(int status, struct sockaddr *src_addr,
3474                          struct rdma_dev_addr *dev_addr, void *context)
3475 {
3476         struct rdma_id_private *id_priv = context;
3477         struct rdma_cm_event event = {};
3478         struct sockaddr *addr;
3479         struct sockaddr_storage old_addr;
3480
3481         mutex_lock(&id_priv->handler_mutex);
3482         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY,
3483                            RDMA_CM_ADDR_RESOLVED))
3484                 goto out;
3485
3486         /*
3487          * Store the previous src address, so that if we fail to acquire
3488          * matching rdma device, old address can be restored back, which helps
3489          * to cancel the cma listen operation correctly.
3490          */
3491         addr = cma_src_addr(id_priv);
3492         memcpy(&old_addr, addr, rdma_addr_size(addr));
3493         memcpy(addr, src_addr, rdma_addr_size(src_addr));
3494         if (!status && !id_priv->cma_dev) {
3495                 status = cma_acquire_dev_by_src_ip(id_priv);
3496                 if (status)
3497                         pr_debug_ratelimited("RDMA CM: ADDR_ERROR: failed to acquire device. status %d\n",
3498                                              status);
3499                 rdma_restrack_add(&id_priv->res);
3500         } else if (status) {
3501                 pr_debug_ratelimited("RDMA CM: ADDR_ERROR: failed to resolve IP. status %d\n", status);
3502         }
3503
3504         if (status) {
3505                 memcpy(addr, &old_addr,
3506                        rdma_addr_size((struct sockaddr *)&old_addr));
3507                 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
3508                                    RDMA_CM_ADDR_BOUND))
3509                         goto out;
3510                 event.event = RDMA_CM_EVENT_ADDR_ERROR;
3511                 event.status = status;
3512         } else
3513                 event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
3514
3515         if (cma_cm_event_handler(id_priv, &event)) {
3516                 destroy_id_handler_unlock(id_priv);
3517                 return;
3518         }
3519 out:
3520         mutex_unlock(&id_priv->handler_mutex);
3521 }
3522
3523 static int cma_resolve_loopback(struct rdma_id_private *id_priv)
3524 {
3525         struct cma_work *work;
3526         union ib_gid gid;
3527         int ret;
3528
3529         work = kzalloc(sizeof *work, GFP_KERNEL);
3530         if (!work)
3531                 return -ENOMEM;
3532
3533         if (!id_priv->cma_dev) {
3534                 ret = cma_bind_loopback(id_priv);
3535                 if (ret)
3536                         goto err;
3537         }
3538
3539         rdma_addr_get_sgid(&id_priv->id.route.addr.dev_addr, &gid);
3540         rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, &gid);
3541
3542         enqueue_resolve_addr_work(work, id_priv);
3543         return 0;
3544 err:
3545         kfree(work);
3546         return ret;
3547 }
3548
3549 static int cma_resolve_ib_addr(struct rdma_id_private *id_priv)
3550 {
3551         struct cma_work *work;
3552         int ret;
3553
3554         work = kzalloc(sizeof *work, GFP_KERNEL);
3555         if (!work)
3556                 return -ENOMEM;
3557
3558         if (!id_priv->cma_dev) {
3559                 ret = cma_resolve_ib_dev(id_priv);
3560                 if (ret)
3561                         goto err;
3562         }
3563
3564         rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, (union ib_gid *)
3565                 &(((struct sockaddr_ib *) &id_priv->id.route.addr.dst_addr)->sib_addr));
3566
3567         enqueue_resolve_addr_work(work, id_priv);
3568         return 0;
3569 err:
3570         kfree(work);
3571         return ret;
3572 }
3573
3574 int rdma_set_reuseaddr(struct rdma_cm_id *id, int reuse)
3575 {
3576         struct rdma_id_private *id_priv;
3577         unsigned long flags;
3578         int ret;
3579
3580         id_priv = container_of(id, struct rdma_id_private, id);
3581         spin_lock_irqsave(&id_priv->lock, flags);
3582         if ((reuse && id_priv->state != RDMA_CM_LISTEN) ||
3583             id_priv->state == RDMA_CM_IDLE) {
3584                 id_priv->reuseaddr = reuse;
3585                 ret = 0;
3586         } else {
3587                 ret = -EINVAL;
3588         }
3589         spin_unlock_irqrestore(&id_priv->lock, flags);
3590         return ret;
3591 }
3592 EXPORT_SYMBOL(rdma_set_reuseaddr);
3593
3594 int rdma_set_afonly(struct rdma_cm_id *id, int afonly)
3595 {
3596         struct rdma_id_private *id_priv;
3597         unsigned long flags;
3598         int ret;
3599
3600         id_priv = container_of(id, struct rdma_id_private, id);
3601         spin_lock_irqsave(&id_priv->lock, flags);
3602         if (id_priv->state == RDMA_CM_IDLE || id_priv->state == RDMA_CM_ADDR_BOUND) {
3603                 id_priv->options |= (1 << CMA_OPTION_AFONLY);
3604                 id_priv->afonly = afonly;
3605                 ret = 0;
3606         } else {
3607                 ret = -EINVAL;
3608         }
3609         spin_unlock_irqrestore(&id_priv->lock, flags);
3610         return ret;
3611 }
3612 EXPORT_SYMBOL(rdma_set_afonly);
3613
3614 static void cma_bind_port(struct rdma_bind_list *bind_list,
3615                           struct rdma_id_private *id_priv)
3616 {
3617         struct sockaddr *addr;
3618         struct sockaddr_ib *sib;
3619         u64 sid, mask;
3620         __be16 port;
3621
3622         lockdep_assert_held(&lock);
3623
3624         addr = cma_src_addr(id_priv);
3625         port = htons(bind_list->port);
3626
3627         switch (addr->sa_family) {
3628         case AF_INET:
3629                 ((struct sockaddr_in *) addr)->sin_port = port;
3630                 break;
3631         case AF_INET6:
3632                 ((struct sockaddr_in6 *) addr)->sin6_port = port;
3633                 break;
3634         case AF_IB:
3635                 sib = (struct sockaddr_ib *) addr;
3636                 sid = be64_to_cpu(sib->sib_sid);
3637                 mask = be64_to_cpu(sib->sib_sid_mask);
3638                 sib->sib_sid = cpu_to_be64((sid & mask) | (u64) ntohs(port));
3639                 sib->sib_sid_mask = cpu_to_be64(~0ULL);
3640                 break;
3641         }
3642         id_priv->bind_list = bind_list;
3643         hlist_add_head(&id_priv->node, &bind_list->owners);
3644 }
3645
3646 static int cma_alloc_port(enum rdma_ucm_port_space ps,
3647                           struct rdma_id_private *id_priv, unsigned short snum)
3648 {
3649         struct rdma_bind_list *bind_list;
3650         int ret;
3651
3652         lockdep_assert_held(&lock);
3653
3654         bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL);
3655         if (!bind_list)
3656                 return -ENOMEM;
3657
3658         ret = cma_ps_alloc(id_priv->id.route.addr.dev_addr.net, ps, bind_list,
3659                            snum);
3660         if (ret < 0)
3661                 goto err;
3662
3663         bind_list->ps = ps;
3664         bind_list->port = snum;
3665         cma_bind_port(bind_list, id_priv);
3666         return 0;
3667 err:
3668         kfree(bind_list);
3669         return ret == -ENOSPC ? -EADDRNOTAVAIL : ret;
3670 }
3671
3672 static int cma_port_is_unique(struct rdma_bind_list *bind_list,
3673                               struct rdma_id_private *id_priv)
3674 {
3675         struct rdma_id_private *cur_id;
3676         struct sockaddr  *daddr = cma_dst_addr(id_priv);
3677         struct sockaddr  *saddr = cma_src_addr(id_priv);
3678         __be16 dport = cma_port(daddr);
3679
3680         lockdep_assert_held(&lock);
3681
3682         hlist_for_each_entry(cur_id, &bind_list->owners, node) {
3683                 struct sockaddr  *cur_daddr = cma_dst_addr(cur_id);
3684                 struct sockaddr  *cur_saddr = cma_src_addr(cur_id);
3685                 __be16 cur_dport = cma_port(cur_daddr);
3686
3687                 if (id_priv == cur_id)
3688                         continue;
3689
3690                 /* different dest port -> unique */
3691                 if (!cma_any_port(daddr) &&
3692                     !cma_any_port(cur_daddr) &&
3693                     (dport != cur_dport))
3694                         continue;
3695
3696                 /* different src address -> unique */
3697                 if (!cma_any_addr(saddr) &&
3698                     !cma_any_addr(cur_saddr) &&
3699                     cma_addr_cmp(saddr, cur_saddr))
3700                         continue;
3701
3702                 /* different dst address -> unique */
3703                 if (!cma_any_addr(daddr) &&
3704                     !cma_any_addr(cur_daddr) &&
3705                     cma_addr_cmp(daddr, cur_daddr))
3706                         continue;
3707
3708                 return -EADDRNOTAVAIL;
3709         }
3710         return 0;
3711 }
3712
3713 static int cma_alloc_any_port(enum rdma_ucm_port_space ps,
3714                               struct rdma_id_private *id_priv)
3715 {
3716         static unsigned int last_used_port;
3717         int low, high, remaining;
3718         unsigned int rover;
3719         struct net *net = id_priv->id.route.addr.dev_addr.net;
3720
3721         lockdep_assert_held(&lock);
3722
3723         inet_get_local_port_range(net, &low, &high);
3724         remaining = (high - low) + 1;
3725         rover = get_random_u32_inclusive(low, remaining + low - 1);
3726 retry:
3727         if (last_used_port != rover) {
3728                 struct rdma_bind_list *bind_list;
3729                 int ret;
3730
3731                 bind_list = cma_ps_find(net, ps, (unsigned short)rover);
3732
3733                 if (!bind_list) {
3734                         ret = cma_alloc_port(ps, id_priv, rover);
3735                 } else {
3736                         ret = cma_port_is_unique(bind_list, id_priv);
3737                         if (!ret)
3738                                 cma_bind_port(bind_list, id_priv);
3739                 }
3740                 /*
3741                  * Remember previously used port number in order to avoid
3742                  * re-using same port immediately after it is closed.
3743                  */
3744                 if (!ret)
3745                         last_used_port = rover;
3746                 if (ret != -EADDRNOTAVAIL)
3747                         return ret;
3748         }
3749         if (--remaining) {
3750                 rover++;
3751                 if ((rover < low) || (rover > high))
3752                         rover = low;
3753                 goto retry;
3754         }
3755         return -EADDRNOTAVAIL;
3756 }
3757
3758 /*
3759  * Check that the requested port is available.  This is called when trying to
3760  * bind to a specific port, or when trying to listen on a bound port.  In
3761  * the latter case, the provided id_priv may already be on the bind_list, but
3762  * we still need to check that it's okay to start listening.
3763  */
3764 static int cma_check_port(struct rdma_bind_list *bind_list,
3765                           struct rdma_id_private *id_priv, uint8_t reuseaddr)
3766 {
3767         struct rdma_id_private *cur_id;
3768         struct sockaddr *addr, *cur_addr;
3769
3770         lockdep_assert_held(&lock);
3771
3772         addr = cma_src_addr(id_priv);
3773         hlist_for_each_entry(cur_id, &bind_list->owners, node) {
3774                 if (id_priv == cur_id)
3775                         continue;
3776
3777                 if (reuseaddr && cur_id->reuseaddr)
3778                         continue;
3779
3780                 cur_addr = cma_src_addr(cur_id);
3781                 if (id_priv->afonly && cur_id->afonly &&
3782                     (addr->sa_family != cur_addr->sa_family))
3783                         continue;
3784
3785                 if (cma_any_addr(addr) || cma_any_addr(cur_addr))
3786                         return -EADDRNOTAVAIL;
3787
3788                 if (!cma_addr_cmp(addr, cur_addr))
3789                         return -EADDRINUSE;
3790         }
3791         return 0;
3792 }
3793
3794 static int cma_use_port(enum rdma_ucm_port_space ps,
3795                         struct rdma_id_private *id_priv)
3796 {
3797         struct rdma_bind_list *bind_list;
3798         unsigned short snum;
3799         int ret;
3800
3801         lockdep_assert_held(&lock);
3802
3803         snum = ntohs(cma_port(cma_src_addr(id_priv)));
3804         if (snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
3805                 return -EACCES;
3806
3807         bind_list = cma_ps_find(id_priv->id.route.addr.dev_addr.net, ps, snum);
3808         if (!bind_list) {
3809                 ret = cma_alloc_port(ps, id_priv, snum);
3810         } else {
3811                 ret = cma_check_port(bind_list, id_priv, id_priv->reuseaddr);
3812                 if (!ret)
3813                         cma_bind_port(bind_list, id_priv);
3814         }
3815         return ret;
3816 }
3817
3818 static enum rdma_ucm_port_space
3819 cma_select_inet_ps(struct rdma_id_private *id_priv)
3820 {
3821         switch (id_priv->id.ps) {
3822         case RDMA_PS_TCP:
3823         case RDMA_PS_UDP:
3824         case RDMA_PS_IPOIB:
3825         case RDMA_PS_IB:
3826                 return id_priv->id.ps;
3827         default:
3828
3829                 return 0;
3830         }
3831 }
3832
3833 static enum rdma_ucm_port_space
3834 cma_select_ib_ps(struct rdma_id_private *id_priv)
3835 {
3836         enum rdma_ucm_port_space ps = 0;
3837         struct sockaddr_ib *sib;
3838         u64 sid_ps, mask, sid;
3839
3840         sib = (struct sockaddr_ib *) cma_src_addr(id_priv);
3841         mask = be64_to_cpu(sib->sib_sid_mask) & RDMA_IB_IP_PS_MASK;
3842         sid = be64_to_cpu(sib->sib_sid) & mask;
3843
3844         if ((id_priv->id.ps == RDMA_PS_IB) && (sid == (RDMA_IB_IP_PS_IB & mask))) {
3845                 sid_ps = RDMA_IB_IP_PS_IB;
3846                 ps = RDMA_PS_IB;
3847         } else if (((id_priv->id.ps == RDMA_PS_IB) || (id_priv->id.ps == RDMA_PS_TCP)) &&
3848                    (sid == (RDMA_IB_IP_PS_TCP & mask))) {
3849                 sid_ps = RDMA_IB_IP_PS_TCP;
3850                 ps = RDMA_PS_TCP;
3851         } else if (((id_priv->id.ps == RDMA_PS_IB) || (id_priv->id.ps == RDMA_PS_UDP)) &&
3852                    (sid == (RDMA_IB_IP_PS_UDP & mask))) {
3853                 sid_ps = RDMA_IB_IP_PS_UDP;
3854                 ps = RDMA_PS_UDP;
3855         }
3856
3857         if (ps) {
3858                 sib->sib_sid = cpu_to_be64(sid_ps | ntohs(cma_port((struct sockaddr *) sib)));
3859                 sib->sib_sid_mask = cpu_to_be64(RDMA_IB_IP_PS_MASK |
3860                                                 be64_to_cpu(sib->sib_sid_mask));
3861         }
3862         return ps;
3863 }
3864
3865 static int cma_get_port(struct rdma_id_private *id_priv)
3866 {
3867         enum rdma_ucm_port_space ps;
3868         int ret;
3869
3870         if (cma_family(id_priv) != AF_IB)
3871                 ps = cma_select_inet_ps(id_priv);
3872         else
3873                 ps = cma_select_ib_ps(id_priv);
3874         if (!ps)
3875                 return -EPROTONOSUPPORT;
3876
3877         mutex_lock(&lock);
3878         if (cma_any_port(cma_src_addr(id_priv)))
3879                 ret = cma_alloc_any_port(ps, id_priv);
3880         else
3881                 ret = cma_use_port(ps, id_priv);
3882         mutex_unlock(&lock);
3883
3884         return ret;
3885 }
3886
3887 static int cma_check_linklocal(struct rdma_dev_addr *dev_addr,
3888                                struct sockaddr *addr)
3889 {
3890 #if IS_ENABLED(CONFIG_IPV6)
3891         struct sockaddr_in6 *sin6;
3892
3893         if (addr->sa_family != AF_INET6)
3894                 return 0;
3895
3896         sin6 = (struct sockaddr_in6 *) addr;
3897
3898         if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
3899                 return 0;
3900
3901         if (!sin6->sin6_scope_id)
3902                         return -EINVAL;
3903
3904         dev_addr->bound_dev_if = sin6->sin6_scope_id;
3905 #endif
3906         return 0;
3907 }
3908
3909 int rdma_listen(struct rdma_cm_id *id, int backlog)
3910 {
3911         struct rdma_id_private *id_priv =
3912                 container_of(id, struct rdma_id_private, id);
3913         int ret;
3914
3915         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_LISTEN)) {
3916                 struct sockaddr_in any_in = {
3917                         .sin_family = AF_INET,
3918                         .sin_addr.s_addr = htonl(INADDR_ANY),
3919                 };
3920
3921                 /* For a well behaved ULP state will be RDMA_CM_IDLE */
3922                 ret = rdma_bind_addr(id, (struct sockaddr *)&any_in);
3923                 if (ret)
3924                         return ret;
3925                 if (WARN_ON(!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND,
3926                                            RDMA_CM_LISTEN)))
3927                         return -EINVAL;
3928         }
3929
3930         /*
3931          * Once the ID reaches RDMA_CM_LISTEN it is not allowed to be reusable
3932          * any more, and has to be unique in the bind list.
3933          */
3934         if (id_priv->reuseaddr) {
3935                 mutex_lock(&lock);
3936                 ret = cma_check_port(id_priv->bind_list, id_priv, 0);
3937                 if (!ret)
3938                         id_priv->reuseaddr = 0;
3939                 mutex_unlock(&lock);
3940                 if (ret)
3941                         goto err;
3942         }
3943
3944         id_priv->backlog = backlog;
3945         if (id_priv->cma_dev) {
3946                 if (rdma_cap_ib_cm(id->device, 1)) {
3947                         ret = cma_ib_listen(id_priv);
3948                         if (ret)
3949                                 goto err;
3950                 } else if (rdma_cap_iw_cm(id->device, 1)) {
3951                         ret = cma_iw_listen(id_priv, backlog);
3952                         if (ret)
3953                                 goto err;
3954                 } else {
3955                         ret = -ENOSYS;
3956                         goto err;
3957                 }
3958         } else {
3959                 ret = cma_listen_on_all(id_priv);
3960                 if (ret)
3961                         goto err;
3962         }
3963
3964         return 0;
3965 err:
3966         id_priv->backlog = 0;
3967         /*
3968          * All the failure paths that lead here will not allow the req_handler's
3969          * to have run.
3970          */
3971         cma_comp_exch(id_priv, RDMA_CM_LISTEN, RDMA_CM_ADDR_BOUND);
3972         return ret;
3973 }
3974 EXPORT_SYMBOL(rdma_listen);
3975
3976 static int rdma_bind_addr_dst(struct rdma_id_private *id_priv,
3977                               struct sockaddr *addr, const struct sockaddr *daddr)
3978 {
3979         struct sockaddr *id_daddr;
3980         int ret;
3981
3982         if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6 &&
3983             addr->sa_family != AF_IB)
3984                 return -EAFNOSUPPORT;
3985
3986         if (!cma_comp_exch(id_priv, RDMA_CM_IDLE, RDMA_CM_ADDR_BOUND))
3987                 return -EINVAL;
3988
3989         ret = cma_check_linklocal(&id_priv->id.route.addr.dev_addr, addr);
3990         if (ret)
3991                 goto err1;
3992
3993         memcpy(cma_src_addr(id_priv), addr, rdma_addr_size(addr));
3994         if (!cma_any_addr(addr)) {
3995                 ret = cma_translate_addr(addr, &id_priv->id.route.addr.dev_addr);
3996                 if (ret)
3997                         goto err1;
3998
3999                 ret = cma_acquire_dev_by_src_ip(id_priv);
4000                 if (ret)
4001                         goto err1;
4002         }
4003
4004         if (!(id_priv->options & (1 << CMA_OPTION_AFONLY))) {
4005                 if (addr->sa_family == AF_INET)
4006                         id_priv->afonly = 1;
4007 #if IS_ENABLED(CONFIG_IPV6)
4008                 else if (addr->sa_family == AF_INET6) {
4009                         struct net *net = id_priv->id.route.addr.dev_addr.net;
4010
4011                         id_priv->afonly = net->ipv6.sysctl.bindv6only;
4012                 }
4013 #endif
4014         }
4015         id_daddr = cma_dst_addr(id_priv);
4016         if (daddr != id_daddr)
4017                 memcpy(id_daddr, daddr, rdma_addr_size(addr));
4018         id_daddr->sa_family = addr->sa_family;
4019
4020         ret = cma_get_port(id_priv);
4021         if (ret)
4022                 goto err2;
4023
4024         if (!cma_any_addr(addr))
4025                 rdma_restrack_add(&id_priv->res);
4026         return 0;
4027 err2:
4028         if (id_priv->cma_dev)
4029                 cma_release_dev(id_priv);
4030 err1:
4031         cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_IDLE);
4032         return ret;
4033 }
4034
4035 static int cma_bind_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
4036                          const struct sockaddr *dst_addr)
4037 {
4038         struct rdma_id_private *id_priv =
4039                 container_of(id, struct rdma_id_private, id);
4040         struct sockaddr_storage zero_sock = {};
4041
4042         if (src_addr && src_addr->sa_family)
4043                 return rdma_bind_addr_dst(id_priv, src_addr, dst_addr);
4044
4045         /*
4046          * When the src_addr is not specified, automatically supply an any addr
4047          */
4048         zero_sock.ss_family = dst_addr->sa_family;
4049         if (IS_ENABLED(CONFIG_IPV6) && dst_addr->sa_family == AF_INET6) {
4050                 struct sockaddr_in6 *src_addr6 =
4051                         (struct sockaddr_in6 *)&zero_sock;
4052                 struct sockaddr_in6 *dst_addr6 =
4053                         (struct sockaddr_in6 *)dst_addr;
4054
4055                 src_addr6->sin6_scope_id = dst_addr6->sin6_scope_id;
4056                 if (ipv6_addr_type(&dst_addr6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
4057                         id->route.addr.dev_addr.bound_dev_if =
4058                                 dst_addr6->sin6_scope_id;
4059         } else if (dst_addr->sa_family == AF_IB) {
4060                 ((struct sockaddr_ib *)&zero_sock)->sib_pkey =
4061                         ((struct sockaddr_ib *)dst_addr)->sib_pkey;
4062         }
4063         return rdma_bind_addr_dst(id_priv, (struct sockaddr *)&zero_sock, dst_addr);
4064 }
4065
4066 /*
4067  * If required, resolve the source address for bind and leave the id_priv in
4068  * state RDMA_CM_ADDR_BOUND. This oddly uses the state to determine the prior
4069  * calls made by ULP, a previously bound ID will not be re-bound and src_addr is
4070  * ignored.
4071  */
4072 static int resolve_prepare_src(struct rdma_id_private *id_priv,
4073                                struct sockaddr *src_addr,
4074                                const struct sockaddr *dst_addr)
4075 {
4076         int ret;
4077
4078         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_ADDR_QUERY)) {
4079                 /* For a well behaved ULP state will be RDMA_CM_IDLE */
4080                 ret = cma_bind_addr(&id_priv->id, src_addr, dst_addr);
4081                 if (ret)
4082                         return ret;
4083                 if (WARN_ON(!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND,
4084                                            RDMA_CM_ADDR_QUERY)))
4085                         return -EINVAL;
4086
4087         } else {
4088                 memcpy(cma_dst_addr(id_priv), dst_addr, rdma_addr_size(dst_addr));
4089         }
4090
4091         if (cma_family(id_priv) != dst_addr->sa_family) {
4092                 ret = -EINVAL;
4093                 goto err_state;
4094         }
4095         return 0;
4096
4097 err_state:
4098         cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY, RDMA_CM_ADDR_BOUND);
4099         return ret;
4100 }
4101
4102 int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
4103                       const struct sockaddr *dst_addr, unsigned long timeout_ms)
4104 {
4105         struct rdma_id_private *id_priv =
4106                 container_of(id, struct rdma_id_private, id);
4107         int ret;
4108
4109         ret = resolve_prepare_src(id_priv, src_addr, dst_addr);
4110         if (ret)
4111                 return ret;
4112
4113         if (cma_any_addr(dst_addr)) {
4114                 ret = cma_resolve_loopback(id_priv);
4115         } else {
4116                 if (dst_addr->sa_family == AF_IB) {
4117                         ret = cma_resolve_ib_addr(id_priv);
4118                 } else {
4119                         /*
4120                          * The FSM can return back to RDMA_CM_ADDR_BOUND after
4121                          * rdma_resolve_ip() is called, eg through the error
4122                          * path in addr_handler(). If this happens the existing
4123                          * request must be canceled before issuing a new one.
4124                          * Since canceling a request is a bit slow and this
4125                          * oddball path is rare, keep track once a request has
4126                          * been issued. The track turns out to be a permanent
4127                          * state since this is the only cancel as it is
4128                          * immediately before rdma_resolve_ip().
4129                          */
4130                         if (id_priv->used_resolve_ip)
4131                                 rdma_addr_cancel(&id->route.addr.dev_addr);
4132                         else
4133                                 id_priv->used_resolve_ip = 1;
4134                         ret = rdma_resolve_ip(cma_src_addr(id_priv), dst_addr,
4135                                               &id->route.addr.dev_addr,
4136                                               timeout_ms, addr_handler,
4137                                               false, id_priv);
4138                 }
4139         }
4140         if (ret)
4141                 goto err;
4142
4143         return 0;
4144 err:
4145         cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY, RDMA_CM_ADDR_BOUND);
4146         return ret;
4147 }
4148 EXPORT_SYMBOL(rdma_resolve_addr);
4149
4150 int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr)
4151 {
4152         struct rdma_id_private *id_priv =
4153                 container_of(id, struct rdma_id_private, id);
4154
4155         return rdma_bind_addr_dst(id_priv, addr, cma_dst_addr(id_priv));
4156 }
4157 EXPORT_SYMBOL(rdma_bind_addr);
4158
4159 static int cma_format_hdr(void *hdr, struct rdma_id_private *id_priv)
4160 {
4161         struct cma_hdr *cma_hdr;
4162
4163         cma_hdr = hdr;
4164         cma_hdr->cma_version = CMA_VERSION;
4165         if (cma_family(id_priv) == AF_INET) {
4166                 struct sockaddr_in *src4, *dst4;
4167
4168                 src4 = (struct sockaddr_in *) cma_src_addr(id_priv);
4169                 dst4 = (struct sockaddr_in *) cma_dst_addr(id_priv);
4170
4171                 cma_set_ip_ver(cma_hdr, 4);
4172                 cma_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
4173                 cma_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
4174                 cma_hdr->port = src4->sin_port;
4175         } else if (cma_family(id_priv) == AF_INET6) {
4176                 struct sockaddr_in6 *src6, *dst6;
4177
4178                 src6 = (struct sockaddr_in6 *) cma_src_addr(id_priv);
4179                 dst6 = (struct sockaddr_in6 *) cma_dst_addr(id_priv);
4180
4181                 cma_set_ip_ver(cma_hdr, 6);
4182                 cma_hdr->src_addr.ip6 = src6->sin6_addr;
4183                 cma_hdr->dst_addr.ip6 = dst6->sin6_addr;
4184                 cma_hdr->port = src6->sin6_port;
4185         }
4186         return 0;
4187 }
4188
4189 static int cma_sidr_rep_handler(struct ib_cm_id *cm_id,
4190                                 const struct ib_cm_event *ib_event)
4191 {
4192         struct rdma_id_private *id_priv = cm_id->context;
4193         struct rdma_cm_event event = {};
4194         const struct ib_cm_sidr_rep_event_param *rep =
4195                                 &ib_event->param.sidr_rep_rcvd;
4196         int ret;
4197
4198         mutex_lock(&id_priv->handler_mutex);
4199         if (READ_ONCE(id_priv->state) != RDMA_CM_CONNECT)
4200                 goto out;
4201
4202         switch (ib_event->event) {
4203         case IB_CM_SIDR_REQ_ERROR:
4204                 event.event = RDMA_CM_EVENT_UNREACHABLE;
4205                 event.status = -ETIMEDOUT;
4206                 break;
4207         case IB_CM_SIDR_REP_RECEIVED:
4208                 event.param.ud.private_data = ib_event->private_data;
4209                 event.param.ud.private_data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
4210                 if (rep->status != IB_SIDR_SUCCESS) {
4211                         event.event = RDMA_CM_EVENT_UNREACHABLE;
4212                         event.status = ib_event->param.sidr_rep_rcvd.status;
4213                         pr_debug_ratelimited("RDMA CM: UNREACHABLE: bad SIDR reply. status %d\n",
4214                                              event.status);
4215                         break;
4216                 }
4217                 ret = cma_set_qkey(id_priv, rep->qkey);
4218                 if (ret) {
4219                         pr_debug_ratelimited("RDMA CM: ADDR_ERROR: failed to set qkey. status %d\n", ret);
4220                         event.event = RDMA_CM_EVENT_ADDR_ERROR;
4221                         event.status = ret;
4222                         break;
4223                 }
4224                 ib_init_ah_attr_from_path(id_priv->id.device,
4225                                           id_priv->id.port_num,
4226                                           id_priv->id.route.path_rec,
4227                                           &event.param.ud.ah_attr,
4228                                           rep->sgid_attr);
4229                 event.param.ud.qp_num = rep->qpn;
4230                 event.param.ud.qkey = rep->qkey;
4231                 event.event = RDMA_CM_EVENT_ESTABLISHED;
4232                 event.status = 0;
4233                 break;
4234         default:
4235                 pr_err("RDMA CMA: unexpected IB CM event: %d\n",
4236                        ib_event->event);
4237                 goto out;
4238         }
4239
4240         ret = cma_cm_event_handler(id_priv, &event);
4241
4242         rdma_destroy_ah_attr(&event.param.ud.ah_attr);
4243         if (ret) {
4244                 /* Destroy the CM ID by returning a non-zero value. */
4245                 id_priv->cm_id.ib = NULL;
4246                 destroy_id_handler_unlock(id_priv);
4247                 return ret;
4248         }
4249 out:
4250         mutex_unlock(&id_priv->handler_mutex);
4251         return 0;
4252 }
4253
4254 static int cma_resolve_ib_udp(struct rdma_id_private *id_priv,
4255                               struct rdma_conn_param *conn_param)
4256 {
4257         struct ib_cm_sidr_req_param req;
4258         struct ib_cm_id *id;
4259         void *private_data;
4260         u8 offset;
4261         int ret;
4262
4263         memset(&req, 0, sizeof req);
4264         offset = cma_user_data_offset(id_priv);
4265         if (check_add_overflow(offset, conn_param->private_data_len, &req.private_data_len))
4266                 return -EINVAL;
4267
4268         if (req.private_data_len) {
4269                 private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
4270                 if (!private_data)
4271                         return -ENOMEM;
4272         } else {
4273                 private_data = NULL;
4274         }
4275
4276         if (conn_param->private_data && conn_param->private_data_len)
4277                 memcpy(private_data + offset, conn_param->private_data,
4278                        conn_param->private_data_len);
4279
4280         if (private_data) {
4281                 ret = cma_format_hdr(private_data, id_priv);
4282                 if (ret)
4283                         goto out;
4284                 req.private_data = private_data;
4285         }
4286
4287         id = ib_create_cm_id(id_priv->id.device, cma_sidr_rep_handler,
4288                              id_priv);
4289         if (IS_ERR(id)) {
4290                 ret = PTR_ERR(id);
4291                 goto out;
4292         }
4293         id_priv->cm_id.ib = id;
4294
4295         req.path = id_priv->id.route.path_rec;
4296         req.sgid_attr = id_priv->id.route.addr.dev_addr.sgid_attr;
4297         req.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
4298         req.timeout_ms = 1 << (CMA_CM_RESPONSE_TIMEOUT - 8);
4299         req.max_cm_retries = CMA_MAX_CM_RETRIES;
4300
4301         trace_cm_send_sidr_req(id_priv);
4302         ret = ib_send_cm_sidr_req(id_priv->cm_id.ib, &req);
4303         if (ret) {
4304                 ib_destroy_cm_id(id_priv->cm_id.ib);
4305                 id_priv->cm_id.ib = NULL;
4306         }
4307 out:
4308         kfree(private_data);
4309         return ret;
4310 }
4311
4312 static int cma_connect_ib(struct rdma_id_private *id_priv,
4313                           struct rdma_conn_param *conn_param)
4314 {
4315         struct ib_cm_req_param req;
4316         struct rdma_route *route;
4317         void *private_data;
4318         struct ib_cm_id *id;
4319         u8 offset;
4320         int ret;
4321
4322         memset(&req, 0, sizeof req);
4323         offset = cma_user_data_offset(id_priv);
4324         if (check_add_overflow(offset, conn_param->private_data_len, &req.private_data_len))
4325                 return -EINVAL;
4326
4327         if (req.private_data_len) {
4328                 private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
4329                 if (!private_data)
4330                         return -ENOMEM;
4331         } else {
4332                 private_data = NULL;
4333         }
4334
4335         if (conn_param->private_data && conn_param->private_data_len)
4336                 memcpy(private_data + offset, conn_param->private_data,
4337                        conn_param->private_data_len);
4338
4339         id = ib_create_cm_id(id_priv->id.device, cma_ib_handler, id_priv);
4340         if (IS_ERR(id)) {
4341                 ret = PTR_ERR(id);
4342                 goto out;
4343         }
4344         id_priv->cm_id.ib = id;
4345
4346         route = &id_priv->id.route;
4347         if (private_data) {
4348                 ret = cma_format_hdr(private_data, id_priv);
4349                 if (ret)
4350                         goto out;
4351                 req.private_data = private_data;
4352         }
4353
4354         req.primary_path = &route->path_rec[0];
4355         req.primary_path_inbound = route->path_rec_inbound;
4356         req.primary_path_outbound = route->path_rec_outbound;
4357         if (route->num_pri_alt_paths == 2)
4358                 req.alternate_path = &route->path_rec[1];
4359
4360         req.ppath_sgid_attr = id_priv->id.route.addr.dev_addr.sgid_attr;
4361         /* Alternate path SGID attribute currently unsupported */
4362         req.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
4363         req.qp_num = id_priv->qp_num;
4364         req.qp_type = id_priv->id.qp_type;
4365         req.starting_psn = id_priv->seq_num;
4366         req.responder_resources = conn_param->responder_resources;
4367         req.initiator_depth = conn_param->initiator_depth;
4368         req.flow_control = conn_param->flow_control;
4369         req.retry_count = min_t(u8, 7, conn_param->retry_count);
4370         req.rnr_retry_count = min_t(u8, 7, conn_param->rnr_retry_count);
4371         req.remote_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
4372         req.local_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
4373         req.max_cm_retries = CMA_MAX_CM_RETRIES;
4374         req.srq = id_priv->srq ? 1 : 0;
4375         req.ece.vendor_id = id_priv->ece.vendor_id;
4376         req.ece.attr_mod = id_priv->ece.attr_mod;
4377
4378         trace_cm_send_req(id_priv);
4379         ret = ib_send_cm_req(id_priv->cm_id.ib, &req);
4380 out:
4381         if (ret && !IS_ERR(id)) {
4382                 ib_destroy_cm_id(id);
4383                 id_priv->cm_id.ib = NULL;
4384         }
4385
4386         kfree(private_data);
4387         return ret;
4388 }
4389
4390 static int cma_connect_iw(struct rdma_id_private *id_priv,
4391                           struct rdma_conn_param *conn_param)
4392 {
4393         struct iw_cm_id *cm_id;
4394         int ret;
4395         struct iw_cm_conn_param iw_param;
4396
4397         cm_id = iw_create_cm_id(id_priv->id.device, cma_iw_handler, id_priv);
4398         if (IS_ERR(cm_id))
4399                 return PTR_ERR(cm_id);
4400
4401         mutex_lock(&id_priv->qp_mutex);
4402         cm_id->tos = id_priv->tos;
4403         cm_id->tos_set = id_priv->tos_set;
4404         mutex_unlock(&id_priv->qp_mutex);
4405
4406         id_priv->cm_id.iw = cm_id;
4407
4408         memcpy(&cm_id->local_addr, cma_src_addr(id_priv),
4409                rdma_addr_size(cma_src_addr(id_priv)));
4410         memcpy(&cm_id->remote_addr, cma_dst_addr(id_priv),
4411                rdma_addr_size(cma_dst_addr(id_priv)));
4412
4413         ret = cma_modify_qp_rtr(id_priv, conn_param);
4414         if (ret)
4415                 goto out;
4416
4417         if (conn_param) {
4418                 iw_param.ord = conn_param->initiator_depth;
4419                 iw_param.ird = conn_param->responder_resources;
4420                 iw_param.private_data = conn_param->private_data;
4421                 iw_param.private_data_len = conn_param->private_data_len;
4422                 iw_param.qpn = id_priv->id.qp ? id_priv->qp_num : conn_param->qp_num;
4423         } else {
4424                 memset(&iw_param, 0, sizeof iw_param);
4425                 iw_param.qpn = id_priv->qp_num;
4426         }
4427         ret = iw_cm_connect(cm_id, &iw_param);
4428 out:
4429         if (ret) {
4430                 iw_destroy_cm_id(cm_id);
4431                 id_priv->cm_id.iw = NULL;
4432         }
4433         return ret;
4434 }
4435
4436 /**
4437  * rdma_connect_locked - Initiate an active connection request.
4438  * @id: Connection identifier to connect.
4439  * @conn_param: Connection information used for connected QPs.
4440  *
4441  * Same as rdma_connect() but can only be called from the
4442  * RDMA_CM_EVENT_ROUTE_RESOLVED handler callback.
4443  */
4444 int rdma_connect_locked(struct rdma_cm_id *id,
4445                         struct rdma_conn_param *conn_param)
4446 {
4447         struct rdma_id_private *id_priv =
4448                 container_of(id, struct rdma_id_private, id);
4449         int ret;
4450
4451         if (!cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_CONNECT))
4452                 return -EINVAL;
4453
4454         if (!id->qp) {
4455                 id_priv->qp_num = conn_param->qp_num;
4456                 id_priv->srq = conn_param->srq;
4457         }
4458
4459         if (rdma_cap_ib_cm(id->device, id->port_num)) {
4460                 if (id->qp_type == IB_QPT_UD)
4461                         ret = cma_resolve_ib_udp(id_priv, conn_param);
4462                 else
4463                         ret = cma_connect_ib(id_priv, conn_param);
4464         } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
4465                 ret = cma_connect_iw(id_priv, conn_param);
4466         } else {
4467                 ret = -ENOSYS;
4468         }
4469         if (ret)
4470                 goto err_state;
4471         return 0;
4472 err_state:
4473         cma_comp_exch(id_priv, RDMA_CM_CONNECT, RDMA_CM_ROUTE_RESOLVED);
4474         return ret;
4475 }
4476 EXPORT_SYMBOL(rdma_connect_locked);
4477
4478 /**
4479  * rdma_connect - Initiate an active connection request.
4480  * @id: Connection identifier to connect.
4481  * @conn_param: Connection information used for connected QPs.
4482  *
4483  * Users must have resolved a route for the rdma_cm_id to connect with by having
4484  * called rdma_resolve_route before calling this routine.
4485  *
4486  * This call will either connect to a remote QP or obtain remote QP information
4487  * for unconnected rdma_cm_id's.  The actual operation is based on the
4488  * rdma_cm_id's port space.
4489  */
4490 int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
4491 {
4492         struct rdma_id_private *id_priv =
4493                 container_of(id, struct rdma_id_private, id);
4494         int ret;
4495
4496         mutex_lock(&id_priv->handler_mutex);
4497         ret = rdma_connect_locked(id, conn_param);
4498         mutex_unlock(&id_priv->handler_mutex);
4499         return ret;
4500 }
4501 EXPORT_SYMBOL(rdma_connect);
4502
4503 /**
4504  * rdma_connect_ece - Initiate an active connection request with ECE data.
4505  * @id: Connection identifier to connect.
4506  * @conn_param: Connection information used for connected QPs.
4507  * @ece: ECE parameters
4508  *
4509  * See rdma_connect() explanation.
4510  */
4511 int rdma_connect_ece(struct rdma_cm_id *id, struct rdma_conn_param *conn_param,
4512                      struct rdma_ucm_ece *ece)
4513 {
4514         struct rdma_id_private *id_priv =
4515                 container_of(id, struct rdma_id_private, id);
4516
4517         id_priv->ece.vendor_id = ece->vendor_id;
4518         id_priv->ece.attr_mod = ece->attr_mod;
4519
4520         return rdma_connect(id, conn_param);
4521 }
4522 EXPORT_SYMBOL(rdma_connect_ece);
4523
4524 static int cma_accept_ib(struct rdma_id_private *id_priv,
4525                          struct rdma_conn_param *conn_param)
4526 {
4527         struct ib_cm_rep_param rep;
4528         int ret;
4529
4530         ret = cma_modify_qp_rtr(id_priv, conn_param);
4531         if (ret)
4532                 goto out;
4533
4534         ret = cma_modify_qp_rts(id_priv, conn_param);
4535         if (ret)
4536                 goto out;
4537
4538         memset(&rep, 0, sizeof rep);
4539         rep.qp_num = id_priv->qp_num;
4540         rep.starting_psn = id_priv->seq_num;
4541         rep.private_data = conn_param->private_data;
4542         rep.private_data_len = conn_param->private_data_len;
4543         rep.responder_resources = conn_param->responder_resources;
4544         rep.initiator_depth = conn_param->initiator_depth;
4545         rep.failover_accepted = 0;
4546         rep.flow_control = conn_param->flow_control;
4547         rep.rnr_retry_count = min_t(u8, 7, conn_param->rnr_retry_count);
4548         rep.srq = id_priv->srq ? 1 : 0;
4549         rep.ece.vendor_id = id_priv->ece.vendor_id;
4550         rep.ece.attr_mod = id_priv->ece.attr_mod;
4551
4552         trace_cm_send_rep(id_priv);
4553         ret = ib_send_cm_rep(id_priv->cm_id.ib, &rep);
4554 out:
4555         return ret;
4556 }
4557
4558 static int cma_accept_iw(struct rdma_id_private *id_priv,
4559                   struct rdma_conn_param *conn_param)
4560 {
4561         struct iw_cm_conn_param iw_param;
4562         int ret;
4563
4564         if (!conn_param)
4565                 return -EINVAL;
4566
4567         ret = cma_modify_qp_rtr(id_priv, conn_param);
4568         if (ret)
4569                 return ret;
4570
4571         iw_param.ord = conn_param->initiator_depth;
4572         iw_param.ird = conn_param->responder_resources;
4573         iw_param.private_data = conn_param->private_data;
4574         iw_param.private_data_len = conn_param->private_data_len;
4575         if (id_priv->id.qp)
4576                 iw_param.qpn = id_priv->qp_num;
4577         else
4578                 iw_param.qpn = conn_param->qp_num;
4579
4580         return iw_cm_accept(id_priv->cm_id.iw, &iw_param);
4581 }
4582
4583 static int cma_send_sidr_rep(struct rdma_id_private *id_priv,
4584                              enum ib_cm_sidr_status status, u32 qkey,
4585                              const void *private_data, int private_data_len)
4586 {
4587         struct ib_cm_sidr_rep_param rep;
4588         int ret;
4589
4590         memset(&rep, 0, sizeof rep);
4591         rep.status = status;
4592         if (status == IB_SIDR_SUCCESS) {
4593                 if (qkey)
4594                         ret = cma_set_qkey(id_priv, qkey);
4595                 else
4596                         ret = cma_set_default_qkey(id_priv);
4597                 if (ret)
4598                         return ret;
4599                 rep.qp_num = id_priv->qp_num;
4600                 rep.qkey = id_priv->qkey;
4601
4602                 rep.ece.vendor_id = id_priv->ece.vendor_id;
4603                 rep.ece.attr_mod = id_priv->ece.attr_mod;
4604         }
4605
4606         rep.private_data = private_data;
4607         rep.private_data_len = private_data_len;
4608
4609         trace_cm_send_sidr_rep(id_priv);
4610         return ib_send_cm_sidr_rep(id_priv->cm_id.ib, &rep);
4611 }
4612
4613 /**
4614  * rdma_accept - Called to accept a connection request or response.
4615  * @id: Connection identifier associated with the request.
4616  * @conn_param: Information needed to establish the connection.  This must be
4617  *   provided if accepting a connection request.  If accepting a connection
4618  *   response, this parameter must be NULL.
4619  *
4620  * Typically, this routine is only called by the listener to accept a connection
4621  * request.  It must also be called on the active side of a connection if the
4622  * user is performing their own QP transitions.
4623  *
4624  * In the case of error, a reject message is sent to the remote side and the
4625  * state of the qp associated with the id is modified to error, such that any
4626  * previously posted receive buffers would be flushed.
4627  *
4628  * This function is for use by kernel ULPs and must be called from under the
4629  * handler callback.
4630  */
4631 int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
4632 {
4633         struct rdma_id_private *id_priv =
4634                 container_of(id, struct rdma_id_private, id);
4635         int ret;
4636
4637         lockdep_assert_held(&id_priv->handler_mutex);
4638
4639         if (READ_ONCE(id_priv->state) != RDMA_CM_CONNECT)
4640                 return -EINVAL;
4641
4642         if (!id->qp && conn_param) {
4643                 id_priv->qp_num = conn_param->qp_num;
4644                 id_priv->srq = conn_param->srq;
4645         }
4646
4647         if (rdma_cap_ib_cm(id->device, id->port_num)) {
4648                 if (id->qp_type == IB_QPT_UD) {
4649                         if (conn_param)
4650                                 ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
4651                                                         conn_param->qkey,
4652                                                         conn_param->private_data,
4653                                                         conn_param->private_data_len);
4654                         else
4655                                 ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
4656                                                         0, NULL, 0);
4657                 } else {
4658                         if (conn_param)
4659                                 ret = cma_accept_ib(id_priv, conn_param);
4660                         else
4661                                 ret = cma_rep_recv(id_priv);
4662                 }
4663         } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
4664                 ret = cma_accept_iw(id_priv, conn_param);
4665         } else {
4666                 ret = -ENOSYS;
4667         }
4668         if (ret)
4669                 goto reject;
4670
4671         return 0;
4672 reject:
4673         cma_modify_qp_err(id_priv);
4674         rdma_reject(id, NULL, 0, IB_CM_REJ_CONSUMER_DEFINED);
4675         return ret;
4676 }
4677 EXPORT_SYMBOL(rdma_accept);
4678
4679 int rdma_accept_ece(struct rdma_cm_id *id, struct rdma_conn_param *conn_param,
4680                     struct rdma_ucm_ece *ece)
4681 {
4682         struct rdma_id_private *id_priv =
4683                 container_of(id, struct rdma_id_private, id);
4684
4685         id_priv->ece.vendor_id = ece->vendor_id;
4686         id_priv->ece.attr_mod = ece->attr_mod;
4687
4688         return rdma_accept(id, conn_param);
4689 }
4690 EXPORT_SYMBOL(rdma_accept_ece);
4691
4692 void rdma_lock_handler(struct rdma_cm_id *id)
4693 {
4694         struct rdma_id_private *id_priv =
4695                 container_of(id, struct rdma_id_private, id);
4696
4697         mutex_lock(&id_priv->handler_mutex);
4698 }
4699 EXPORT_SYMBOL(rdma_lock_handler);
4700
4701 void rdma_unlock_handler(struct rdma_cm_id *id)
4702 {
4703         struct rdma_id_private *id_priv =
4704                 container_of(id, struct rdma_id_private, id);
4705
4706         mutex_unlock(&id_priv->handler_mutex);
4707 }
4708 EXPORT_SYMBOL(rdma_unlock_handler);
4709
4710 int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event)
4711 {
4712         struct rdma_id_private *id_priv;
4713         int ret;
4714
4715         id_priv = container_of(id, struct rdma_id_private, id);
4716         if (!id_priv->cm_id.ib)
4717                 return -EINVAL;
4718
4719         switch (id->device->node_type) {
4720         case RDMA_NODE_IB_CA:
4721                 ret = ib_cm_notify(id_priv->cm_id.ib, event);
4722                 break;
4723         default:
4724                 ret = 0;
4725                 break;
4726         }
4727         return ret;
4728 }
4729 EXPORT_SYMBOL(rdma_notify);
4730
4731 int rdma_reject(struct rdma_cm_id *id, const void *private_data,
4732                 u8 private_data_len, u8 reason)
4733 {
4734         struct rdma_id_private *id_priv;
4735         int ret;
4736
4737         id_priv = container_of(id, struct rdma_id_private, id);
4738         if (!id_priv->cm_id.ib)
4739                 return -EINVAL;
4740
4741         if (rdma_cap_ib_cm(id->device, id->port_num)) {
4742                 if (id->qp_type == IB_QPT_UD) {
4743                         ret = cma_send_sidr_rep(id_priv, IB_SIDR_REJECT, 0,
4744                                                 private_data, private_data_len);
4745                 } else {
4746                         trace_cm_send_rej(id_priv);
4747                         ret = ib_send_cm_rej(id_priv->cm_id.ib, reason, NULL, 0,
4748                                              private_data, private_data_len);
4749                 }
4750         } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
4751                 ret = iw_cm_reject(id_priv->cm_id.iw,
4752                                    private_data, private_data_len);
4753         } else {
4754                 ret = -ENOSYS;
4755         }
4756
4757         return ret;
4758 }
4759 EXPORT_SYMBOL(rdma_reject);
4760
4761 int rdma_disconnect(struct rdma_cm_id *id)
4762 {
4763         struct rdma_id_private *id_priv;
4764         int ret;
4765
4766         id_priv = container_of(id, struct rdma_id_private, id);
4767         if (!id_priv->cm_id.ib)
4768                 return -EINVAL;
4769
4770         if (rdma_cap_ib_cm(id->device, id->port_num)) {
4771                 ret = cma_modify_qp_err(id_priv);
4772                 if (ret)
4773                         goto out;
4774                 /* Initiate or respond to a disconnect. */
4775                 trace_cm_disconnect(id_priv);
4776                 if (ib_send_cm_dreq(id_priv->cm_id.ib, NULL, 0)) {
4777                         if (!ib_send_cm_drep(id_priv->cm_id.ib, NULL, 0))
4778                                 trace_cm_sent_drep(id_priv);
4779                 } else {
4780                         trace_cm_sent_dreq(id_priv);
4781                 }
4782         } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
4783                 ret = iw_cm_disconnect(id_priv->cm_id.iw, 0);
4784         } else
4785                 ret = -EINVAL;
4786
4787 out:
4788         return ret;
4789 }
4790 EXPORT_SYMBOL(rdma_disconnect);
4791
4792 static void cma_make_mc_event(int status, struct rdma_id_private *id_priv,
4793                               struct ib_sa_multicast *multicast,
4794                               struct rdma_cm_event *event,
4795                               struct cma_multicast *mc)
4796 {
4797         struct rdma_dev_addr *dev_addr;
4798         enum ib_gid_type gid_type;
4799         struct net_device *ndev;
4800
4801         if (status)
4802                 pr_debug_ratelimited("RDMA CM: MULTICAST_ERROR: failed to join multicast. status %d\n",
4803                                      status);
4804
4805         event->status = status;
4806         event->param.ud.private_data = mc->context;
4807         if (status) {
4808                 event->event = RDMA_CM_EVENT_MULTICAST_ERROR;
4809                 return;
4810         }
4811
4812         dev_addr = &id_priv->id.route.addr.dev_addr;
4813         ndev = dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if);
4814         gid_type =
4815                 id_priv->cma_dev
4816                         ->default_gid_type[id_priv->id.port_num -
4817                                            rdma_start_port(
4818                                                    id_priv->cma_dev->device)];
4819
4820         event->event = RDMA_CM_EVENT_MULTICAST_JOIN;
4821         if (ib_init_ah_from_mcmember(id_priv->id.device, id_priv->id.port_num,
4822                                      &multicast->rec, ndev, gid_type,
4823                                      &event->param.ud.ah_attr)) {
4824                 event->event = RDMA_CM_EVENT_MULTICAST_ERROR;
4825                 goto out;
4826         }
4827
4828         event->param.ud.qp_num = 0xFFFFFF;
4829         event->param.ud.qkey = id_priv->qkey;
4830
4831 out:
4832         dev_put(ndev);
4833 }
4834
4835 static int cma_ib_mc_handler(int status, struct ib_sa_multicast *multicast)
4836 {
4837         struct cma_multicast *mc = multicast->context;
4838         struct rdma_id_private *id_priv = mc->id_priv;
4839         struct rdma_cm_event event = {};
4840         int ret = 0;
4841
4842         mutex_lock(&id_priv->handler_mutex);
4843         if (READ_ONCE(id_priv->state) == RDMA_CM_DEVICE_REMOVAL ||
4844             READ_ONCE(id_priv->state) == RDMA_CM_DESTROYING)
4845                 goto out;
4846
4847         ret = cma_set_qkey(id_priv, be32_to_cpu(multicast->rec.qkey));
4848         if (!ret) {
4849                 cma_make_mc_event(status, id_priv, multicast, &event, mc);
4850                 ret = cma_cm_event_handler(id_priv, &event);
4851         }
4852         rdma_destroy_ah_attr(&event.param.ud.ah_attr);
4853         WARN_ON(ret);
4854
4855 out:
4856         mutex_unlock(&id_priv->handler_mutex);
4857         return 0;
4858 }
4859
4860 static void cma_set_mgid(struct rdma_id_private *id_priv,
4861                          struct sockaddr *addr, union ib_gid *mgid)
4862 {
4863         unsigned char mc_map[MAX_ADDR_LEN];
4864         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
4865         struct sockaddr_in *sin = (struct sockaddr_in *) addr;
4866         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) addr;
4867
4868         if (cma_any_addr(addr)) {
4869                 memset(mgid, 0, sizeof *mgid);
4870         } else if ((addr->sa_family == AF_INET6) &&
4871                    ((be32_to_cpu(sin6->sin6_addr.s6_addr32[0]) & 0xFFF0FFFF) ==
4872                                                                  0xFF10A01B)) {
4873                 /* IPv6 address is an SA assigned MGID. */
4874                 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
4875         } else if (addr->sa_family == AF_IB) {
4876                 memcpy(mgid, &((struct sockaddr_ib *) addr)->sib_addr, sizeof *mgid);
4877         } else if (addr->sa_family == AF_INET6) {
4878                 ipv6_ib_mc_map(&sin6->sin6_addr, dev_addr->broadcast, mc_map);
4879                 if (id_priv->id.ps == RDMA_PS_UDP)
4880                         mc_map[7] = 0x01;       /* Use RDMA CM signature */
4881                 *mgid = *(union ib_gid *) (mc_map + 4);
4882         } else {
4883                 ip_ib_mc_map(sin->sin_addr.s_addr, dev_addr->broadcast, mc_map);
4884                 if (id_priv->id.ps == RDMA_PS_UDP)
4885                         mc_map[7] = 0x01;       /* Use RDMA CM signature */
4886                 *mgid = *(union ib_gid *) (mc_map + 4);
4887         }
4888 }
4889
4890 static int cma_join_ib_multicast(struct rdma_id_private *id_priv,
4891                                  struct cma_multicast *mc)
4892 {
4893         struct ib_sa_mcmember_rec rec;
4894         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
4895         ib_sa_comp_mask comp_mask;
4896         int ret;
4897
4898         ib_addr_get_mgid(dev_addr, &rec.mgid);
4899         ret = ib_sa_get_mcmember_rec(id_priv->id.device, id_priv->id.port_num,
4900                                      &rec.mgid, &rec);
4901         if (ret)
4902                 return ret;
4903
4904         if (!id_priv->qkey) {
4905                 ret = cma_set_default_qkey(id_priv);
4906                 if (ret)
4907                         return ret;
4908         }
4909
4910         cma_set_mgid(id_priv, (struct sockaddr *) &mc->addr, &rec.mgid);
4911         rec.qkey = cpu_to_be32(id_priv->qkey);
4912         rdma_addr_get_sgid(dev_addr, &rec.port_gid);
4913         rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
4914         rec.join_state = mc->join_state;
4915
4916         comp_mask = IB_SA_MCMEMBER_REC_MGID | IB_SA_MCMEMBER_REC_PORT_GID |
4917                     IB_SA_MCMEMBER_REC_PKEY | IB_SA_MCMEMBER_REC_JOIN_STATE |
4918                     IB_SA_MCMEMBER_REC_QKEY | IB_SA_MCMEMBER_REC_SL |
4919                     IB_SA_MCMEMBER_REC_FLOW_LABEL |
4920                     IB_SA_MCMEMBER_REC_TRAFFIC_CLASS;
4921
4922         if (id_priv->id.ps == RDMA_PS_IPOIB)
4923                 comp_mask |= IB_SA_MCMEMBER_REC_RATE |
4924                              IB_SA_MCMEMBER_REC_RATE_SELECTOR |
4925                              IB_SA_MCMEMBER_REC_MTU_SELECTOR |
4926                              IB_SA_MCMEMBER_REC_MTU |
4927                              IB_SA_MCMEMBER_REC_HOP_LIMIT;
4928
4929         mc->sa_mc = ib_sa_join_multicast(&sa_client, id_priv->id.device,
4930                                          id_priv->id.port_num, &rec, comp_mask,
4931                                          GFP_KERNEL, cma_ib_mc_handler, mc);
4932         return PTR_ERR_OR_ZERO(mc->sa_mc);
4933 }
4934
4935 static void cma_iboe_set_mgid(struct sockaddr *addr, union ib_gid *mgid,
4936                               enum ib_gid_type gid_type)
4937 {
4938         struct sockaddr_in *sin = (struct sockaddr_in *)addr;
4939         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr;
4940
4941         if (cma_any_addr(addr)) {
4942                 memset(mgid, 0, sizeof *mgid);
4943         } else if (addr->sa_family == AF_INET6) {
4944                 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
4945         } else {
4946                 mgid->raw[0] =
4947                         (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) ? 0 : 0xff;
4948                 mgid->raw[1] =
4949                         (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) ? 0 : 0x0e;
4950                 mgid->raw[2] = 0;
4951                 mgid->raw[3] = 0;
4952                 mgid->raw[4] = 0;
4953                 mgid->raw[5] = 0;
4954                 mgid->raw[6] = 0;
4955                 mgid->raw[7] = 0;
4956                 mgid->raw[8] = 0;
4957                 mgid->raw[9] = 0;
4958                 mgid->raw[10] = 0xff;
4959                 mgid->raw[11] = 0xff;
4960                 *(__be32 *)(&mgid->raw[12]) = sin->sin_addr.s_addr;
4961         }
4962 }
4963
4964 static int cma_iboe_join_multicast(struct rdma_id_private *id_priv,
4965                                    struct cma_multicast *mc)
4966 {
4967         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
4968         int err = 0;
4969         struct sockaddr *addr = (struct sockaddr *)&mc->addr;
4970         struct net_device *ndev = NULL;
4971         struct ib_sa_multicast ib;
4972         enum ib_gid_type gid_type;
4973         bool send_only;
4974
4975         send_only = mc->join_state == BIT(SENDONLY_FULLMEMBER_JOIN);
4976
4977         if (cma_zero_addr(addr))
4978                 return -EINVAL;
4979
4980         gid_type = id_priv->cma_dev->default_gid_type[id_priv->id.port_num -
4981                    rdma_start_port(id_priv->cma_dev->device)];
4982         cma_iboe_set_mgid(addr, &ib.rec.mgid, gid_type);
4983
4984         ib.rec.pkey = cpu_to_be16(0xffff);
4985         if (dev_addr->bound_dev_if)
4986                 ndev = dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if);
4987         if (!ndev)
4988                 return -ENODEV;
4989
4990         ib.rec.rate = IB_RATE_PORT_CURRENT;
4991         ib.rec.hop_limit = 1;
4992         ib.rec.mtu = iboe_get_mtu(ndev->mtu);
4993
4994         if (addr->sa_family == AF_INET) {
4995                 if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) {
4996                         ib.rec.hop_limit = IPV6_DEFAULT_HOPLIMIT;
4997                         if (!send_only) {
4998                                 err = cma_igmp_send(ndev, &ib.rec.mgid,
4999                                                     true);
5000                         }
5001                 }
5002         } else {
5003                 if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP)
5004                         err = -ENOTSUPP;
5005         }
5006         dev_put(ndev);
5007         if (err || !ib.rec.mtu)
5008                 return err ?: -EINVAL;
5009
5010         if (!id_priv->qkey)
5011                 cma_set_default_qkey(id_priv);
5012
5013         rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
5014                     &ib.rec.port_gid);
5015         INIT_WORK(&mc->iboe_join.work, cma_iboe_join_work_handler);
5016         cma_make_mc_event(0, id_priv, &ib, &mc->iboe_join.event, mc);
5017         queue_work(cma_wq, &mc->iboe_join.work);
5018         return 0;
5019 }
5020
5021 int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
5022                         u8 join_state, void *context)
5023 {
5024         struct rdma_id_private *id_priv =
5025                 container_of(id, struct rdma_id_private, id);
5026         struct cma_multicast *mc;
5027         int ret;
5028
5029         /* Not supported for kernel QPs */
5030         if (WARN_ON(id->qp))
5031                 return -EINVAL;
5032
5033         /* ULP is calling this wrong. */
5034         if (!id->device || (READ_ONCE(id_priv->state) != RDMA_CM_ADDR_BOUND &&
5035                             READ_ONCE(id_priv->state) != RDMA_CM_ADDR_RESOLVED))
5036                 return -EINVAL;
5037
5038         if (id_priv->id.qp_type != IB_QPT_UD)
5039                 return -EINVAL;
5040
5041         mc = kzalloc(sizeof(*mc), GFP_KERNEL);
5042         if (!mc)
5043                 return -ENOMEM;
5044
5045         memcpy(&mc->addr, addr, rdma_addr_size(addr));
5046         mc->context = context;
5047         mc->id_priv = id_priv;
5048         mc->join_state = join_state;
5049
5050         if (rdma_protocol_roce(id->device, id->port_num)) {
5051                 ret = cma_iboe_join_multicast(id_priv, mc);
5052                 if (ret)
5053                         goto out_err;
5054         } else if (rdma_cap_ib_mcast(id->device, id->port_num)) {
5055                 ret = cma_join_ib_multicast(id_priv, mc);
5056                 if (ret)
5057                         goto out_err;
5058         } else {
5059                 ret = -ENOSYS;
5060                 goto out_err;
5061         }
5062
5063         spin_lock(&id_priv->lock);
5064         list_add(&mc->list, &id_priv->mc_list);
5065         spin_unlock(&id_priv->lock);
5066
5067         return 0;
5068 out_err:
5069         kfree(mc);
5070         return ret;
5071 }
5072 EXPORT_SYMBOL(rdma_join_multicast);
5073
5074 void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr)
5075 {
5076         struct rdma_id_private *id_priv;
5077         struct cma_multicast *mc;
5078
5079         id_priv = container_of(id, struct rdma_id_private, id);
5080         spin_lock_irq(&id_priv->lock);
5081         list_for_each_entry(mc, &id_priv->mc_list, list) {
5082                 if (memcmp(&mc->addr, addr, rdma_addr_size(addr)) != 0)
5083                         continue;
5084                 list_del(&mc->list);
5085                 spin_unlock_irq(&id_priv->lock);
5086
5087                 WARN_ON(id_priv->cma_dev->device != id->device);
5088                 destroy_mc(id_priv, mc);
5089                 return;
5090         }
5091         spin_unlock_irq(&id_priv->lock);
5092 }
5093 EXPORT_SYMBOL(rdma_leave_multicast);
5094
5095 static int cma_netdev_change(struct net_device *ndev, struct rdma_id_private *id_priv)
5096 {
5097         struct rdma_dev_addr *dev_addr;
5098         struct cma_work *work;
5099
5100         dev_addr = &id_priv->id.route.addr.dev_addr;
5101
5102         if ((dev_addr->bound_dev_if == ndev->ifindex) &&
5103             (net_eq(dev_net(ndev), dev_addr->net)) &&
5104             memcmp(dev_addr->src_dev_addr, ndev->dev_addr, ndev->addr_len)) {
5105                 pr_info("RDMA CM addr change for ndev %s used by id %p\n",
5106                         ndev->name, &id_priv->id);
5107                 work = kzalloc(sizeof *work, GFP_KERNEL);
5108                 if (!work)
5109                         return -ENOMEM;
5110
5111                 INIT_WORK(&work->work, cma_work_handler);
5112                 work->id = id_priv;
5113                 work->event.event = RDMA_CM_EVENT_ADDR_CHANGE;
5114                 cma_id_get(id_priv);
5115                 queue_work(cma_wq, &work->work);
5116         }
5117
5118         return 0;
5119 }
5120
5121 static int cma_netdev_callback(struct notifier_block *self, unsigned long event,
5122                                void *ptr)
5123 {
5124         struct net_device *ndev = netdev_notifier_info_to_dev(ptr);
5125         struct cma_device *cma_dev;
5126         struct rdma_id_private *id_priv;
5127         int ret = NOTIFY_DONE;
5128
5129         if (event != NETDEV_BONDING_FAILOVER)
5130                 return NOTIFY_DONE;
5131
5132         if (!netif_is_bond_master(ndev))
5133                 return NOTIFY_DONE;
5134
5135         mutex_lock(&lock);
5136         list_for_each_entry(cma_dev, &dev_list, list)
5137                 list_for_each_entry(id_priv, &cma_dev->id_list, device_item) {
5138                         ret = cma_netdev_change(ndev, id_priv);
5139                         if (ret)
5140                                 goto out;
5141                 }
5142
5143 out:
5144         mutex_unlock(&lock);
5145         return ret;
5146 }
5147
5148 static void cma_netevent_work_handler(struct work_struct *_work)
5149 {
5150         struct rdma_id_private *id_priv =
5151                 container_of(_work, struct rdma_id_private, id.net_work);
5152         struct rdma_cm_event event = {};
5153
5154         mutex_lock(&id_priv->handler_mutex);
5155
5156         if (READ_ONCE(id_priv->state) == RDMA_CM_DESTROYING ||
5157             READ_ONCE(id_priv->state) == RDMA_CM_DEVICE_REMOVAL)
5158                 goto out_unlock;
5159
5160         event.event = RDMA_CM_EVENT_UNREACHABLE;
5161         event.status = -ETIMEDOUT;
5162
5163         if (cma_cm_event_handler(id_priv, &event)) {
5164                 __acquire(&id_priv->handler_mutex);
5165                 id_priv->cm_id.ib = NULL;
5166                 cma_id_put(id_priv);
5167                 destroy_id_handler_unlock(id_priv);
5168                 return;
5169         }
5170
5171 out_unlock:
5172         mutex_unlock(&id_priv->handler_mutex);
5173         cma_id_put(id_priv);
5174 }
5175
5176 static int cma_netevent_callback(struct notifier_block *self,
5177                                  unsigned long event, void *ctx)
5178 {
5179         struct id_table_entry *ips_node = NULL;
5180         struct rdma_id_private *current_id;
5181         struct neighbour *neigh = ctx;
5182         unsigned long flags;
5183
5184         if (event != NETEVENT_NEIGH_UPDATE)
5185                 return NOTIFY_DONE;
5186
5187         spin_lock_irqsave(&id_table_lock, flags);
5188         if (neigh->tbl->family == AF_INET6) {
5189                 struct sockaddr_in6 neigh_sock_6;
5190
5191                 neigh_sock_6.sin6_family = AF_INET6;
5192                 neigh_sock_6.sin6_addr = *(struct in6_addr *)neigh->primary_key;
5193                 ips_node = node_from_ndev_ip(&id_table, neigh->dev->ifindex,
5194                                              (struct sockaddr *)&neigh_sock_6);
5195         } else if (neigh->tbl->family == AF_INET) {
5196                 struct sockaddr_in neigh_sock_4;
5197
5198                 neigh_sock_4.sin_family = AF_INET;
5199                 neigh_sock_4.sin_addr.s_addr = *(__be32 *)(neigh->primary_key);
5200                 ips_node = node_from_ndev_ip(&id_table, neigh->dev->ifindex,
5201                                              (struct sockaddr *)&neigh_sock_4);
5202         } else
5203                 goto out;
5204
5205         if (!ips_node)
5206                 goto out;
5207
5208         list_for_each_entry(current_id, &ips_node->id_list, id_list_entry) {
5209                 if (!memcmp(current_id->id.route.addr.dev_addr.dst_dev_addr,
5210                            neigh->ha, ETH_ALEN))
5211                         continue;
5212                 INIT_WORK(&current_id->id.net_work, cma_netevent_work_handler);
5213                 cma_id_get(current_id);
5214                 queue_work(cma_wq, &current_id->id.net_work);
5215         }
5216 out:
5217         spin_unlock_irqrestore(&id_table_lock, flags);
5218         return NOTIFY_DONE;
5219 }
5220
5221 static struct notifier_block cma_nb = {
5222         .notifier_call = cma_netdev_callback
5223 };
5224
5225 static struct notifier_block cma_netevent_cb = {
5226         .notifier_call = cma_netevent_callback
5227 };
5228
5229 static void cma_send_device_removal_put(struct rdma_id_private *id_priv)
5230 {
5231         struct rdma_cm_event event = { .event = RDMA_CM_EVENT_DEVICE_REMOVAL };
5232         enum rdma_cm_state state;
5233         unsigned long flags;
5234
5235         mutex_lock(&id_priv->handler_mutex);
5236         /* Record that we want to remove the device */
5237         spin_lock_irqsave(&id_priv->lock, flags);
5238         state = id_priv->state;
5239         if (state == RDMA_CM_DESTROYING || state == RDMA_CM_DEVICE_REMOVAL) {
5240                 spin_unlock_irqrestore(&id_priv->lock, flags);
5241                 mutex_unlock(&id_priv->handler_mutex);
5242                 cma_id_put(id_priv);
5243                 return;
5244         }
5245         id_priv->state = RDMA_CM_DEVICE_REMOVAL;
5246         spin_unlock_irqrestore(&id_priv->lock, flags);
5247
5248         if (cma_cm_event_handler(id_priv, &event)) {
5249                 /*
5250                  * At this point the ULP promises it won't call
5251                  * rdma_destroy_id() concurrently
5252                  */
5253                 cma_id_put(id_priv);
5254                 mutex_unlock(&id_priv->handler_mutex);
5255                 trace_cm_id_destroy(id_priv);
5256                 _destroy_id(id_priv, state);
5257                 return;
5258         }
5259         mutex_unlock(&id_priv->handler_mutex);
5260
5261         /*
5262          * If this races with destroy then the thread that first assigns state
5263          * to a destroying does the cancel.
5264          */
5265         cma_cancel_operation(id_priv, state);
5266         cma_id_put(id_priv);
5267 }
5268
5269 static void cma_process_remove(struct cma_device *cma_dev)
5270 {
5271         mutex_lock(&lock);
5272         while (!list_empty(&cma_dev->id_list)) {
5273                 struct rdma_id_private *id_priv = list_first_entry(
5274                         &cma_dev->id_list, struct rdma_id_private, device_item);
5275
5276                 list_del_init(&id_priv->listen_item);
5277                 list_del_init(&id_priv->device_item);
5278                 cma_id_get(id_priv);
5279                 mutex_unlock(&lock);
5280
5281                 cma_send_device_removal_put(id_priv);
5282
5283                 mutex_lock(&lock);
5284         }
5285         mutex_unlock(&lock);
5286
5287         cma_dev_put(cma_dev);
5288         wait_for_completion(&cma_dev->comp);
5289 }
5290
5291 static bool cma_supported(struct ib_device *device)
5292 {
5293         u32 i;
5294
5295         rdma_for_each_port(device, i) {
5296                 if (rdma_cap_ib_cm(device, i) || rdma_cap_iw_cm(device, i))
5297                         return true;
5298         }
5299         return false;
5300 }
5301
5302 static int cma_add_one(struct ib_device *device)
5303 {
5304         struct rdma_id_private *to_destroy;
5305         struct cma_device *cma_dev;
5306         struct rdma_id_private *id_priv;
5307         unsigned long supported_gids = 0;
5308         int ret;
5309         u32 i;
5310
5311         if (!cma_supported(device))
5312                 return -EOPNOTSUPP;
5313
5314         cma_dev = kmalloc(sizeof(*cma_dev), GFP_KERNEL);
5315         if (!cma_dev)
5316                 return -ENOMEM;
5317
5318         cma_dev->device = device;
5319         cma_dev->default_gid_type = kcalloc(device->phys_port_cnt,
5320                                             sizeof(*cma_dev->default_gid_type),
5321                                             GFP_KERNEL);
5322         if (!cma_dev->default_gid_type) {
5323                 ret = -ENOMEM;
5324                 goto free_cma_dev;
5325         }
5326
5327         cma_dev->default_roce_tos = kcalloc(device->phys_port_cnt,
5328                                             sizeof(*cma_dev->default_roce_tos),
5329                                             GFP_KERNEL);
5330         if (!cma_dev->default_roce_tos) {
5331                 ret = -ENOMEM;
5332                 goto free_gid_type;
5333         }
5334
5335         rdma_for_each_port (device, i) {
5336                 supported_gids = roce_gid_type_mask_support(device, i);
5337                 WARN_ON(!supported_gids);
5338                 if (supported_gids & (1 << CMA_PREFERRED_ROCE_GID_TYPE))
5339                         cma_dev->default_gid_type[i - rdma_start_port(device)] =
5340                                 CMA_PREFERRED_ROCE_GID_TYPE;
5341                 else
5342                         cma_dev->default_gid_type[i - rdma_start_port(device)] =
5343                                 find_first_bit(&supported_gids, BITS_PER_LONG);
5344                 cma_dev->default_roce_tos[i - rdma_start_port(device)] = 0;
5345         }
5346
5347         init_completion(&cma_dev->comp);
5348         refcount_set(&cma_dev->refcount, 1);
5349         INIT_LIST_HEAD(&cma_dev->id_list);
5350         ib_set_client_data(device, &cma_client, cma_dev);
5351
5352         mutex_lock(&lock);
5353         list_add_tail(&cma_dev->list, &dev_list);
5354         list_for_each_entry(id_priv, &listen_any_list, listen_any_item) {
5355                 ret = cma_listen_on_dev(id_priv, cma_dev, &to_destroy);
5356                 if (ret)
5357                         goto free_listen;
5358         }
5359         mutex_unlock(&lock);
5360
5361         trace_cm_add_one(device);
5362         return 0;
5363
5364 free_listen:
5365         list_del(&cma_dev->list);
5366         mutex_unlock(&lock);
5367
5368         /* cma_process_remove() will delete to_destroy */
5369         cma_process_remove(cma_dev);
5370         kfree(cma_dev->default_roce_tos);
5371 free_gid_type:
5372         kfree(cma_dev->default_gid_type);
5373
5374 free_cma_dev:
5375         kfree(cma_dev);
5376         return ret;
5377 }
5378
5379 static void cma_remove_one(struct ib_device *device, void *client_data)
5380 {
5381         struct cma_device *cma_dev = client_data;
5382
5383         trace_cm_remove_one(device);
5384
5385         mutex_lock(&lock);
5386         list_del(&cma_dev->list);
5387         mutex_unlock(&lock);
5388
5389         cma_process_remove(cma_dev);
5390         kfree(cma_dev->default_roce_tos);
5391         kfree(cma_dev->default_gid_type);
5392         kfree(cma_dev);
5393 }
5394
5395 static int cma_init_net(struct net *net)
5396 {
5397         struct cma_pernet *pernet = cma_pernet(net);
5398
5399         xa_init(&pernet->tcp_ps);
5400         xa_init(&pernet->udp_ps);
5401         xa_init(&pernet->ipoib_ps);
5402         xa_init(&pernet->ib_ps);
5403
5404         return 0;
5405 }
5406
5407 static void cma_exit_net(struct net *net)
5408 {
5409         struct cma_pernet *pernet = cma_pernet(net);
5410
5411         WARN_ON(!xa_empty(&pernet->tcp_ps));
5412         WARN_ON(!xa_empty(&pernet->udp_ps));
5413         WARN_ON(!xa_empty(&pernet->ipoib_ps));
5414         WARN_ON(!xa_empty(&pernet->ib_ps));
5415 }
5416
5417 static struct pernet_operations cma_pernet_operations = {
5418         .init = cma_init_net,
5419         .exit = cma_exit_net,
5420         .id = &cma_pernet_id,
5421         .size = sizeof(struct cma_pernet),
5422 };
5423
5424 static int __init cma_init(void)
5425 {
5426         int ret;
5427
5428         /*
5429          * There is a rare lock ordering dependency in cma_netdev_callback()
5430          * that only happens when bonding is enabled. Teach lockdep that rtnl
5431          * must never be nested under lock so it can find these without having
5432          * to test with bonding.
5433          */
5434         if (IS_ENABLED(CONFIG_LOCKDEP)) {
5435                 rtnl_lock();
5436                 mutex_lock(&lock);
5437                 mutex_unlock(&lock);
5438                 rtnl_unlock();
5439         }
5440
5441         cma_wq = alloc_ordered_workqueue("rdma_cm", WQ_MEM_RECLAIM);
5442         if (!cma_wq)
5443                 return -ENOMEM;
5444
5445         ret = register_pernet_subsys(&cma_pernet_operations);
5446         if (ret)
5447                 goto err_wq;
5448
5449         ib_sa_register_client(&sa_client);
5450         register_netdevice_notifier(&cma_nb);
5451         register_netevent_notifier(&cma_netevent_cb);
5452
5453         ret = ib_register_client(&cma_client);
5454         if (ret)
5455                 goto err;
5456
5457         ret = cma_configfs_init();
5458         if (ret)
5459                 goto err_ib;
5460
5461         return 0;
5462
5463 err_ib:
5464         ib_unregister_client(&cma_client);
5465 err:
5466         unregister_netevent_notifier(&cma_netevent_cb);
5467         unregister_netdevice_notifier(&cma_nb);
5468         ib_sa_unregister_client(&sa_client);
5469         unregister_pernet_subsys(&cma_pernet_operations);
5470 err_wq:
5471         destroy_workqueue(cma_wq);
5472         return ret;
5473 }
5474
5475 static void __exit cma_cleanup(void)
5476 {
5477         cma_configfs_exit();
5478         ib_unregister_client(&cma_client);
5479         unregister_netevent_notifier(&cma_netevent_cb);
5480         unregister_netdevice_notifier(&cma_nb);
5481         ib_sa_unregister_client(&sa_client);
5482         unregister_pernet_subsys(&cma_pernet_operations);
5483         destroy_workqueue(cma_wq);
5484 }
5485
5486 module_init(cma_init);
5487 module_exit(cma_cleanup);