drivers/infiniband/core/cma.c

   1 // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
   2 /*
   3  * Copyright (c) 2005 Voltaire Inc.  All rights reserved.
   4  * Copyright (c) 2002-2005, Network Appliance, Inc. All rights reserved.
   5  * Copyright (c) 1999-2019, Mellanox Technologies, Inc. All rights reserved.
   6  * Copyright (c) 2005-2006 Intel Corporation.  All rights reserved.
   7  */
   8
   9 #include <linux/completion.h>
  10 #include <linux/in.h>
  11 #include <linux/in6.h>
  12 #include <linux/mutex.h>
  13 #include <linux/random.h>
  14 #include <linux/igmp.h>
  15 #include <linux/xarray.h>
  16 #include <linux/inetdevice.h>
  17 #include <linux/slab.h>
  18 #include <linux/module.h>
  19 #include <net/route.h>
  20
  21 #include <net/net_namespace.h>
  22 #include <net/netns/generic.h>
  23 #include <net/tcp.h>
  24 #include <net/ipv6.h>
  25 #include <net/ip_fib.h>
  26 #include <net/ip6_route.h>
  27
  28 #include <rdma/rdma_cm.h>
  29 #include <rdma/rdma_cm_ib.h>
  30 #include <rdma/rdma_netlink.h>
  31 #include <rdma/ib.h>
  32 #include <rdma/ib_cache.h>
  33 #include <rdma/ib_cm.h>
  34 #include <rdma/ib_sa.h>
  35 #include <rdma/iw_cm.h>
  36
  37 #include "core_priv.h"
  38 #include "cma_priv.h"
  39 #include "cma_trace.h"
  40
  41 MODULE_AUTHOR("Sean Hefty");
  42 MODULE_DESCRIPTION("Generic RDMA CM Agent");
  43 MODULE_LICENSE("Dual BSD/GPL");
  44
  45 #define CMA_CM_RESPONSE_TIMEOUT 20
  46 #define CMA_QUERY_CLASSPORT_INFO_TIMEOUT 3000
  47 #define CMA_MAX_CM_RETRIES 15
  48 #define CMA_CM_MRA_SETTING (IB_CM_MRA_FLAG_DELAY | 24)
  49 #define CMA_IBOE_PACKET_LIFETIME 18
  50 #define CMA_PREFERRED_ROCE_GID_TYPE IB_GID_TYPE_ROCE_UDP_ENCAP
  51
  52 static const char * const cma_events[] = {
  53         [RDMA_CM_EVENT_ADDR_RESOLVED]    = "address resolved",
  54         [RDMA_CM_EVENT_ADDR_ERROR]       = "address error",
  55         [RDMA_CM_EVENT_ROUTE_RESOLVED]   = "route resolved ",
  56         [RDMA_CM_EVENT_ROUTE_ERROR]      = "route error",
  57         [RDMA_CM_EVENT_CONNECT_REQUEST]  = "connect request",
  58         [RDMA_CM_EVENT_CONNECT_RESPONSE] = "connect response",
  59         [RDMA_CM_EVENT_CONNECT_ERROR]    = "connect error",
  60         [RDMA_CM_EVENT_UNREACHABLE]      = "unreachable",
  61         [RDMA_CM_EVENT_REJECTED]         = "rejected",
  62         [RDMA_CM_EVENT_ESTABLISHED]      = "established",
  63         [RDMA_CM_EVENT_DISCONNECTED]     = "disconnected",
  64         [RDMA_CM_EVENT_DEVICE_REMOVAL]   = "device removal",
  65         [RDMA_CM_EVENT_MULTICAST_JOIN]   = "multicast join",
  66         [RDMA_CM_EVENT_MULTICAST_ERROR]  = "multicast error",
  67         [RDMA_CM_EVENT_ADDR_CHANGE]      = "address change",
  68         [RDMA_CM_EVENT_TIMEWAIT_EXIT]    = "timewait exit",
  69 };
  70
  71 static void cma_set_mgid(struct rdma_id_private *id_priv, struct sockaddr *addr,
  72                          union ib_gid *mgid);
  73
  74 const char *__attribute_const__ rdma_event_msg(enum rdma_cm_event_type event)
  75 {
  76         size_t index = event;
  77
  78         return (index < ARRAY_SIZE(cma_events) && cma_events[index]) ?
  79                         cma_events[index] : "unrecognized event";
  80 }
  81 EXPORT_SYMBOL(rdma_event_msg);
  82
  83 const char *__attribute_const__ rdma_reject_msg(struct rdma_cm_id *id,
  84                                                 int reason)
  85 {
  86         if (rdma_ib_or_roce(id->device, id->port_num))
  87                 return ibcm_reject_msg(reason);
  88
  89         if (rdma_protocol_iwarp(id->device, id->port_num))
  90                 return iwcm_reject_msg(reason);
  91
  92         WARN_ON_ONCE(1);
  93         return "unrecognized transport";
  94 }
  95 EXPORT_SYMBOL(rdma_reject_msg);
  96
  97 /**
  98  * rdma_is_consumer_reject - return true if the consumer rejected the connect
  99  *                           request.
 100  * @id: Communication identifier that received the REJECT event.
 101  * @reason: Value returned in the REJECT event status field.
 102  */
 103 static bool rdma_is_consumer_reject(struct rdma_cm_id *id, int reason)
 104 {
 105         if (rdma_ib_or_roce(id->device, id->port_num))
 106                 return reason == IB_CM_REJ_CONSUMER_DEFINED;
 107
 108         if (rdma_protocol_iwarp(id->device, id->port_num))
 109                 return reason == -ECONNREFUSED;
 110
 111         WARN_ON_ONCE(1);
 112         return false;
 113 }
 114
 115 const void *rdma_consumer_reject_data(struct rdma_cm_id *id,
 116                                       struct rdma_cm_event *ev, u8 *data_len)
 117 {
 118         const void *p;
 119
 120         if (rdma_is_consumer_reject(id, ev->status)) {
 121                 *data_len = ev->param.conn.private_data_len;
 122                 p = ev->param.conn.private_data;
 123         } else {
 124                 *data_len = 0;
 125                 p = NULL;
 126         }
 127         return p;
 128 }
 129 EXPORT_SYMBOL(rdma_consumer_reject_data);
 130
 131 /**
 132  * rdma_iw_cm_id() - return the iw_cm_id pointer for this cm_id.
 133  * @id: Communication Identifier
 134  */
 135 struct iw_cm_id *rdma_iw_cm_id(struct rdma_cm_id *id)
 136 {
 137         struct rdma_id_private *id_priv;
 138
 139         id_priv = container_of(id, struct rdma_id_private, id);
 140         if (id->device->node_type == RDMA_NODE_RNIC)
 141                 return id_priv->cm_id.iw;
 142         return NULL;
 143 }
 144 EXPORT_SYMBOL(rdma_iw_cm_id);
 145
 146 /**
 147  * rdma_res_to_id() - return the rdma_cm_id pointer for this restrack.
 148  * @res: rdma resource tracking entry pointer
 149  */
 150 struct rdma_cm_id *rdma_res_to_id(struct rdma_restrack_entry *res)
 151 {
 152         struct rdma_id_private *id_priv =
 153                 container_of(res, struct rdma_id_private, res);
 154
 155         return &id_priv->id;
 156 }
 157 EXPORT_SYMBOL(rdma_res_to_id);
 158
 159 static int cma_add_one(struct ib_device *device);
 160 static void cma_remove_one(struct ib_device *device, void *client_data);
 161
 162 static struct ib_client cma_client = {
 163         .name   = "cma",
 164         .add    = cma_add_one,
 165         .remove = cma_remove_one
 166 };
 167
 168 static struct ib_sa_client sa_client;
 169 static LIST_HEAD(dev_list);
 170 static LIST_HEAD(listen_any_list);
 171 static DEFINE_MUTEX(lock);
 172 static struct workqueue_struct *cma_wq;
 173 static unsigned int cma_pernet_id;
 174
 175 struct cma_pernet {
 176         struct xarray tcp_ps;
 177         struct xarray udp_ps;
 178         struct xarray ipoib_ps;
 179         struct xarray ib_ps;
 180 };
 181
 182 static struct cma_pernet *cma_pernet(struct net *net)
 183 {
 184         return net_generic(net, cma_pernet_id);
 185 }
 186
 187 static
 188 struct xarray *cma_pernet_xa(struct net *net, enum rdma_ucm_port_space ps)
 189 {
 190         struct cma_pernet *pernet = cma_pernet(net);
 191
 192         switch (ps) {
 193         case RDMA_PS_TCP:
 194                 return &pernet->tcp_ps;
 195         case RDMA_PS_UDP:
 196                 return &pernet->udp_ps;
 197         case RDMA_PS_IPOIB:
 198                 return &pernet->ipoib_ps;
 199         case RDMA_PS_IB:
 200                 return &pernet->ib_ps;
 201         default:
 202                 return NULL;
 203         }
 204 }
 205
 206 struct cma_device {
 207         struct list_head        list;
 208         struct ib_device        *device;
 209         struct completion       comp;
 210         refcount_t refcount;
 211         struct list_head        id_list;
 212         enum ib_gid_type        *default_gid_type;
 213         u8                      *default_roce_tos;
 214 };
 215
 216 struct rdma_bind_list {
 217         enum rdma_ucm_port_space ps;
 218         struct hlist_head       owners;
 219         unsigned short          port;
 220 };
 221
 222 struct class_port_info_context {
 223         struct ib_class_port_info       *class_port_info;
 224         struct ib_device                *device;
 225         struct completion               done;
 226         struct ib_sa_query              *sa_query;
 227         u8                              port_num;
 228 };
 229
 230 static int cma_ps_alloc(struct net *net, enum rdma_ucm_port_space ps,
 231                         struct rdma_bind_list *bind_list, int snum)
 232 {
 233         struct xarray *xa = cma_pernet_xa(net, ps);
 234
 235         return xa_insert(xa, snum, bind_list, GFP_KERNEL);
 236 }
 237
 238 static struct rdma_bind_list *cma_ps_find(struct net *net,
 239                                           enum rdma_ucm_port_space ps, int snum)
 240 {
 241         struct xarray *xa = cma_pernet_xa(net, ps);
 242
 243         return xa_load(xa, snum);
 244 }
 245
 246 static void cma_ps_remove(struct net *net, enum rdma_ucm_port_space ps,
 247                           int snum)
 248 {
 249         struct xarray *xa = cma_pernet_xa(net, ps);
 250
 251         xa_erase(xa, snum);
 252 }
 253
 254 enum {
 255         CMA_OPTION_AFONLY,
 256 };
 257
 258 void cma_dev_get(struct cma_device *cma_dev)
 259 {
 260         refcount_inc(&cma_dev->refcount);
 261 }
 262
 263 void cma_dev_put(struct cma_device *cma_dev)
 264 {
 265         if (refcount_dec_and_test(&cma_dev->refcount))
 266                 complete(&cma_dev->comp);
 267 }
 268
 269 struct cma_device *cma_enum_devices_by_ibdev(cma_device_filter  filter,
 270                                              void               *cookie)
 271 {
 272         struct cma_device *cma_dev;
 273         struct cma_device *found_cma_dev = NULL;
 274
 275         mutex_lock(&lock);
 276
 277         list_for_each_entry(cma_dev, &dev_list, list)
 278                 if (filter(cma_dev->device, cookie)) {
 279                         found_cma_dev = cma_dev;
 280                         break;
 281                 }
 282
 283         if (found_cma_dev)
 284                 cma_dev_get(found_cma_dev);
 285         mutex_unlock(&lock);
 286         return found_cma_dev;
 287 }
 288
 289 int cma_get_default_gid_type(struct cma_device *cma_dev,
 290                              unsigned int port)
 291 {
 292         if (!rdma_is_port_valid(cma_dev->device, port))
 293                 return -EINVAL;
 294
 295         return cma_dev->default_gid_type[port - rdma_start_port(cma_dev->device)];
 296 }
 297
 298 int cma_set_default_gid_type(struct cma_device *cma_dev,
 299                              unsigned int port,
 300                              enum ib_gid_type default_gid_type)
 301 {
 302         unsigned long supported_gids;
 303
 304         if (!rdma_is_port_valid(cma_dev->device, port))
 305                 return -EINVAL;
 306
 307         if (default_gid_type == IB_GID_TYPE_IB &&
 308             rdma_protocol_roce_eth_encap(cma_dev->device, port))
 309                 default_gid_type = IB_GID_TYPE_ROCE;
 310
 311         supported_gids = roce_gid_type_mask_support(cma_dev->device, port);
 312
 313         if (!(supported_gids & 1 << default_gid_type))
 314                 return -EINVAL;
 315
 316         cma_dev->default_gid_type[port - rdma_start_port(cma_dev->device)] =
 317                 default_gid_type;
 318
 319         return 0;
 320 }
 321
 322 int cma_get_default_roce_tos(struct cma_device *cma_dev, unsigned int port)
 323 {
 324         if (!rdma_is_port_valid(cma_dev->device, port))
 325                 return -EINVAL;
 326
 327         return cma_dev->default_roce_tos[port - rdma_start_port(cma_dev->device)];
 328 }
 329
 330 int cma_set_default_roce_tos(struct cma_device *cma_dev, unsigned int port,
 331                              u8 default_roce_tos)
 332 {
 333         if (!rdma_is_port_valid(cma_dev->device, port))
 334                 return -EINVAL;
 335
 336         cma_dev->default_roce_tos[port - rdma_start_port(cma_dev->device)] =
 337                  default_roce_tos;
 338
 339         return 0;
 340 }
 341 struct ib_device *cma_get_ib_dev(struct cma_device *cma_dev)
 342 {
 343         return cma_dev->device;
 344 }
 345
 346 /*
 347  * Device removal can occur at anytime, so we need extra handling to
 348  * serialize notifying the user of device removal with other callbacks.
 349  * We do this by disabling removal notification while a callback is in process,
 350  * and reporting it after the callback completes.
 351  */
 352
 353 struct cma_multicast {
 354         struct rdma_id_private *id_priv;
 355         union {
 356                 struct ib_sa_multicast *sa_mc;
 357                 struct {
 358                         struct work_struct work;
 359                         struct rdma_cm_event event;
 360                 } iboe_join;
 361         };
 362         struct list_head        list;
 363         void                    *context;
 364         struct sockaddr_storage addr;
 365         u8                      join_state;
 366 };
 367
 368 struct cma_work {
 369         struct work_struct      work;
 370         struct rdma_id_private  *id;
 371         enum rdma_cm_state      old_state;
 372         enum rdma_cm_state      new_state;
 373         struct rdma_cm_event    event;
 374 };
 375
 376 union cma_ip_addr {
 377         struct in6_addr ip6;
 378         struct {
 379                 __be32 pad[3];
 380                 __be32 addr;
 381         } ip4;
 382 };
 383
 384 struct cma_hdr {
 385         u8 cma_version;
 386         u8 ip_version;  /* IP version: 7:4 */
 387         __be16 port;
 388         union cma_ip_addr src_addr;
 389         union cma_ip_addr dst_addr;
 390 };
 391
 392 #define CMA_VERSION 0x00
 393
 394 struct cma_req_info {
 395         struct sockaddr_storage listen_addr_storage;
 396         struct sockaddr_storage src_addr_storage;
 397         struct ib_device *device;
 398         union ib_gid local_gid;
 399         __be64 service_id;
 400         int port;
 401         bool has_gid;
 402         u16 pkey;
 403 };
 404
 405 static int cma_comp_exch(struct rdma_id_private *id_priv,
 406                          enum rdma_cm_state comp, enum rdma_cm_state exch)
 407 {
 408         unsigned long flags;
 409         int ret;
 410
 411         /*
 412          * The FSM uses a funny double locking where state is protected by both
 413          * the handler_mutex and the spinlock. State is not allowed to change
 414          * to/from a handler_mutex protected value without also holding
 415          * handler_mutex.
 416          */
 417         if (comp == RDMA_CM_CONNECT || exch == RDMA_CM_CONNECT)
 418                 lockdep_assert_held(&id_priv->handler_mutex);
 419
 420         spin_lock_irqsave(&id_priv->lock, flags);
 421         if ((ret = (id_priv->state == comp)))
 422                 id_priv->state = exch;
 423         spin_unlock_irqrestore(&id_priv->lock, flags);
 424         return ret;
 425 }
 426
 427 static inline u8 cma_get_ip_ver(const struct cma_hdr *hdr)
 428 {
 429         return hdr->ip_version >> 4;
 430 }
 431
 432 static inline void cma_set_ip_ver(struct cma_hdr *hdr, u8 ip_ver)
 433 {
 434         hdr->ip_version = (ip_ver << 4) | (hdr->ip_version & 0xF);
 435 }
 436
 437 static int cma_igmp_send(struct net_device *ndev, union ib_gid *mgid, bool join)
 438 {
 439         struct in_device *in_dev = NULL;
 440
 441         if (ndev) {
 442                 rtnl_lock();
 443                 in_dev = __in_dev_get_rtnl(ndev);
 444                 if (in_dev) {
 445                         if (join)
 446                                 ip_mc_inc_group(in_dev,
 447                                                 *(__be32 *)(mgid->raw + 12));
 448                         else
 449                                 ip_mc_dec_group(in_dev,
 450                                                 *(__be32 *)(mgid->raw + 12));
 451                 }
 452                 rtnl_unlock();
 453         }
 454         return (in_dev) ? 0 : -ENODEV;
 455 }
 456
 457 static void _cma_attach_to_dev(struct rdma_id_private *id_priv,
 458                                struct cma_device *cma_dev)
 459 {
 460         cma_dev_get(cma_dev);
 461         id_priv->cma_dev = cma_dev;
 462         id_priv->id.device = cma_dev->device;
 463         id_priv->id.route.addr.dev_addr.transport =
 464                 rdma_node_get_transport(cma_dev->device->node_type);
 465         list_add_tail(&id_priv->list, &cma_dev->id_list);
 466         rdma_restrack_add(&id_priv->res);
 467
 468         trace_cm_id_attach(id_priv, cma_dev->device);
 469 }
 470
 471 static void cma_attach_to_dev(struct rdma_id_private *id_priv,
 472                               struct cma_device *cma_dev)
 473 {
 474         _cma_attach_to_dev(id_priv, cma_dev);
 475         id_priv->gid_type =
 476                 cma_dev->default_gid_type[id_priv->id.port_num -
 477                                           rdma_start_port(cma_dev->device)];
 478 }
 479
 480 static void cma_release_dev(struct rdma_id_private *id_priv)
 481 {
 482         mutex_lock(&lock);
 483         list_del(&id_priv->list);
 484         cma_dev_put(id_priv->cma_dev);
 485         id_priv->cma_dev = NULL;
 486         if (id_priv->id.route.addr.dev_addr.sgid_attr) {
 487                 rdma_put_gid_attr(id_priv->id.route.addr.dev_addr.sgid_attr);
 488                 id_priv->id.route.addr.dev_addr.sgid_attr = NULL;
 489         }
 490         mutex_unlock(&lock);
 491 }
 492
 493 static inline struct sockaddr *cma_src_addr(struct rdma_id_private *id_priv)
 494 {
 495         return (struct sockaddr *) &id_priv->id.route.addr.src_addr;
 496 }
 497
 498 static inline struct sockaddr *cma_dst_addr(struct rdma_id_private *id_priv)
 499 {
 500         return (struct sockaddr *) &id_priv->id.route.addr.dst_addr;
 501 }
 502
 503 static inline unsigned short cma_family(struct rdma_id_private *id_priv)
 504 {
 505         return id_priv->id.route.addr.src_addr.ss_family;
 506 }
 507
 508 static int cma_set_qkey(struct rdma_id_private *id_priv, u32 qkey)
 509 {
 510         struct ib_sa_mcmember_rec rec;
 511         int ret = 0;
 512
 513         if (id_priv->qkey) {
 514                 if (qkey && id_priv->qkey != qkey)
 515                         return -EINVAL;
 516                 return 0;
 517         }
 518
 519         if (qkey) {
 520                 id_priv->qkey = qkey;
 521                 return 0;
 522         }
 523
 524         switch (id_priv->id.ps) {
 525         case RDMA_PS_UDP:
 526         case RDMA_PS_IB:
 527                 id_priv->qkey = RDMA_UDP_QKEY;
 528                 break;
 529         case RDMA_PS_IPOIB:
 530                 ib_addr_get_mgid(&id_priv->id.route.addr.dev_addr, &rec.mgid);
 531                 ret = ib_sa_get_mcmember_rec(id_priv->id.device,
 532                                              id_priv->id.port_num, &rec.mgid,
 533                                              &rec);
 534                 if (!ret)
 535                         id_priv->qkey = be32_to_cpu(rec.qkey);
 536                 break;
 537         default:
 538                 break;
 539         }
 540         return ret;
 541 }
 542
 543 static void cma_translate_ib(struct sockaddr_ib *sib, struct rdma_dev_addr *dev_addr)
 544 {
 545         dev_addr->dev_type = ARPHRD_INFINIBAND;
 546         rdma_addr_set_sgid(dev_addr, (union ib_gid *) &sib->sib_addr);
 547         ib_addr_set_pkey(dev_addr, ntohs(sib->sib_pkey));
 548 }
 549
 550 static int cma_translate_addr(struct sockaddr *addr, struct rdma_dev_addr *dev_addr)
 551 {
 552         int ret;
 553
 554         if (addr->sa_family != AF_IB) {
 555                 ret = rdma_translate_ip(addr, dev_addr);
 556         } else {
 557                 cma_translate_ib((struct sockaddr_ib *) addr, dev_addr);
 558                 ret = 0;
 559         }
 560
 561         return ret;
 562 }
 563
 564 static const struct ib_gid_attr *
 565 cma_validate_port(struct ib_device *device, u8 port,
 566                   enum ib_gid_type gid_type,
 567                   union ib_gid *gid,
 568                   struct rdma_id_private *id_priv)
 569 {
 570         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
 571         int bound_if_index = dev_addr->bound_dev_if;
 572         const struct ib_gid_attr *sgid_attr;
 573         int dev_type = dev_addr->dev_type;
 574         struct net_device *ndev = NULL;
 575
 576         if (!rdma_dev_access_netns(device, id_priv->id.route.addr.dev_addr.net))
 577                 return ERR_PTR(-ENODEV);
 578
 579         if ((dev_type == ARPHRD_INFINIBAND) && !rdma_protocol_ib(device, port))
 580                 return ERR_PTR(-ENODEV);
 581
 582         if ((dev_type != ARPHRD_INFINIBAND) && rdma_protocol_ib(device, port))
 583                 return ERR_PTR(-ENODEV);
 584
 585         if (dev_type == ARPHRD_ETHER && rdma_protocol_roce(device, port)) {
 586                 ndev = dev_get_by_index(dev_addr->net, bound_if_index);
 587                 if (!ndev)
 588                         return ERR_PTR(-ENODEV);
 589         } else {
 590                 gid_type = IB_GID_TYPE_IB;
 591         }
 592
 593         sgid_attr = rdma_find_gid_by_port(device, gid, gid_type, port, ndev);
 594         if (ndev)
 595                 dev_put(ndev);
 596         return sgid_attr;
 597 }
 598
 599 static void cma_bind_sgid_attr(struct rdma_id_private *id_priv,
 600                                const struct ib_gid_attr *sgid_attr)
 601 {
 602         WARN_ON(id_priv->id.route.addr.dev_addr.sgid_attr);
 603         id_priv->id.route.addr.dev_addr.sgid_attr = sgid_attr;
 604 }
 605
 606 /**
 607  * cma_acquire_dev_by_src_ip - Acquire cma device, port, gid attribute
 608  * based on source ip address.
 609  * @id_priv:    cm_id which should be bound to cma device
 610  *
 611  * cma_acquire_dev_by_src_ip() binds cm id to cma device, port and GID attribute
 612  * based on source IP address. It returns 0 on success or error code otherwise.
 613  * It is applicable to active and passive side cm_id.
 614  */
 615 static int cma_acquire_dev_by_src_ip(struct rdma_id_private *id_priv)
 616 {
 617         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
 618         const struct ib_gid_attr *sgid_attr;
 619         union ib_gid gid, iboe_gid, *gidp;
 620         struct cma_device *cma_dev;
 621         enum ib_gid_type gid_type;
 622         int ret = -ENODEV;
 623         unsigned int port;
 624
 625         if (dev_addr->dev_type != ARPHRD_INFINIBAND &&
 626             id_priv->id.ps == RDMA_PS_IPOIB)
 627                 return -EINVAL;
 628
 629         rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
 630                     &iboe_gid);
 631
 632         memcpy(&gid, dev_addr->src_dev_addr +
 633                rdma_addr_gid_offset(dev_addr), sizeof(gid));
 634
 635         mutex_lock(&lock);
 636         list_for_each_entry(cma_dev, &dev_list, list) {
 637                 rdma_for_each_port (cma_dev->device, port) {
 638                         gidp = rdma_protocol_roce(cma_dev->device, port) ?
 639                                &iboe_gid : &gid;
 640                         gid_type = cma_dev->default_gid_type[port - 1];
 641                         sgid_attr = cma_validate_port(cma_dev->device, port,
 642                                                       gid_type, gidp, id_priv);
 643                         if (!IS_ERR(sgid_attr)) {
 644                                 id_priv->id.port_num = port;
 645                                 cma_bind_sgid_attr(id_priv, sgid_attr);
 646                                 cma_attach_to_dev(id_priv, cma_dev);
 647                                 ret = 0;
 648                                 goto out;
 649                         }
 650                 }
 651         }
 652 out:
 653         mutex_unlock(&lock);
 654         return ret;
 655 }
 656
 657 /**
 658  * cma_ib_acquire_dev - Acquire cma device, port and SGID attribute
 659  * @id_priv:            cm id to bind to cma device
 660  * @listen_id_priv:     listener cm id to match against
 661  * @req:                Pointer to req structure containaining incoming
 662  *                      request information
 663  * cma_ib_acquire_dev() acquires cma device, port and SGID attribute when
 664  * rdma device matches for listen_id and incoming request. It also verifies
 665  * that a GID table entry is present for the source address.
 666  * Returns 0 on success, or returns error code otherwise.
 667  */
 668 static int cma_ib_acquire_dev(struct rdma_id_private *id_priv,
 669                               const struct rdma_id_private *listen_id_priv,
 670                               struct cma_req_info *req)
 671 {
 672         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
 673         const struct ib_gid_attr *sgid_attr;
 674         enum ib_gid_type gid_type;
 675         union ib_gid gid;
 676
 677         if (dev_addr->dev_type != ARPHRD_INFINIBAND &&
 678             id_priv->id.ps == RDMA_PS_IPOIB)
 679                 return -EINVAL;
 680
 681         if (rdma_protocol_roce(req->device, req->port))
 682                 rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
 683                             &gid);
 684         else
 685                 memcpy(&gid, dev_addr->src_dev_addr +
 686                        rdma_addr_gid_offset(dev_addr), sizeof(gid));
 687
 688         gid_type = listen_id_priv->cma_dev->default_gid_type[req->port - 1];
 689         sgid_attr = cma_validate_port(req->device, req->port,
 690                                       gid_type, &gid, id_priv);
 691         if (IS_ERR(sgid_attr))
 692                 return PTR_ERR(sgid_attr);
 693
 694         id_priv->id.port_num = req->port;
 695         cma_bind_sgid_attr(id_priv, sgid_attr);
 696         /* Need to acquire lock to protect against reader
 697          * of cma_dev->id_list such as cma_netdev_callback() and
 698          * cma_process_remove().
 699          */
 700         mutex_lock(&lock);
 701         cma_attach_to_dev(id_priv, listen_id_priv->cma_dev);
 702         mutex_unlock(&lock);
 703         return 0;
 704 }
 705
 706 static int cma_iw_acquire_dev(struct rdma_id_private *id_priv,
 707                               const struct rdma_id_private *listen_id_priv)
 708 {
 709         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
 710         const struct ib_gid_attr *sgid_attr;
 711         struct cma_device *cma_dev;
 712         enum ib_gid_type gid_type;
 713         int ret = -ENODEV;
 714         unsigned int port;
 715         union ib_gid gid;
 716
 717         if (dev_addr->dev_type != ARPHRD_INFINIBAND &&
 718             id_priv->id.ps == RDMA_PS_IPOIB)
 719                 return -EINVAL;
 720
 721         memcpy(&gid, dev_addr->src_dev_addr +
 722                rdma_addr_gid_offset(dev_addr), sizeof(gid));
 723
 724         mutex_lock(&lock);
 725
 726         cma_dev = listen_id_priv->cma_dev;
 727         port = listen_id_priv->id.port_num;
 728         gid_type = listen_id_priv->gid_type;
 729         sgid_attr = cma_validate_port(cma_dev->device, port,
 730                                       gid_type, &gid, id_priv);
 731         if (!IS_ERR(sgid_attr)) {
 732                 id_priv->id.port_num = port;
 733                 cma_bind_sgid_attr(id_priv, sgid_attr);
 734                 ret = 0;
 735                 goto out;
 736         }
 737
 738         list_for_each_entry(cma_dev, &dev_list, list) {
 739                 rdma_for_each_port (cma_dev->device, port) {
 740                         if (listen_id_priv->cma_dev == cma_dev &&
 741                             listen_id_priv->id.port_num == port)
 742                                 continue;
 743
 744                         gid_type = cma_dev->default_gid_type[port - 1];
 745                         sgid_attr = cma_validate_port(cma_dev->device, port,
 746                                                       gid_type, &gid, id_priv);
 747                         if (!IS_ERR(sgid_attr)) {
 748                                 id_priv->id.port_num = port;
 749                                 cma_bind_sgid_attr(id_priv, sgid_attr);
 750                                 ret = 0;
 751                                 goto out;
 752                         }
 753                 }
 754         }
 755
 756 out:
 757         if (!ret)
 758                 cma_attach_to_dev(id_priv, cma_dev);
 759
 760         mutex_unlock(&lock);
 761         return ret;
 762 }
 763
 764 /*
 765  * Select the source IB device and address to reach the destination IB address.
 766  */
 767 static int cma_resolve_ib_dev(struct rdma_id_private *id_priv)
 768 {
 769         struct cma_device *cma_dev, *cur_dev;
 770         struct sockaddr_ib *addr;
 771         union ib_gid gid, sgid, *dgid;
 772         unsigned int p;
 773         u16 pkey, index;
 774         enum ib_port_state port_state;
 775         int i;
 776
 777         cma_dev = NULL;
 778         addr = (struct sockaddr_ib *) cma_dst_addr(id_priv);
 779         dgid = (union ib_gid *) &addr->sib_addr;
 780         pkey = ntohs(addr->sib_pkey);
 781
 782         mutex_lock(&lock);
 783         list_for_each_entry(cur_dev, &dev_list, list) {
 784                 rdma_for_each_port (cur_dev->device, p) {
 785                         if (!rdma_cap_af_ib(cur_dev->device, p))
 786                                 continue;
 787
 788                         if (ib_find_cached_pkey(cur_dev->device, p, pkey, &index))
 789                                 continue;
 790
 791                         if (ib_get_cached_port_state(cur_dev->device, p, &port_state))
 792                                 continue;
 793                         for (i = 0; !rdma_query_gid(cur_dev->device,
 794                                                     p, i, &gid);
 795                              i++) {
 796                                 if (!memcmp(&gid, dgid, sizeof(gid))) {
 797                                         cma_dev = cur_dev;
 798                                         sgid = gid;
 799                                         id_priv->id.port_num = p;
 800                                         goto found;
 801                                 }
 802
 803                                 if (!cma_dev && (gid.global.subnet_prefix ==
 804                                     dgid->global.subnet_prefix) &&
 805                                     port_state == IB_PORT_ACTIVE) {
 806                                         cma_dev = cur_dev;
 807                                         sgid = gid;
 808                                         id_priv->id.port_num = p;
 809                                         goto found;
 810                                 }
 811                         }
 812                 }
 813         }
 814         mutex_unlock(&lock);
 815         return -ENODEV;
 816
 817 found:
 818         cma_attach_to_dev(id_priv, cma_dev);
 819         mutex_unlock(&lock);
 820         addr = (struct sockaddr_ib *)cma_src_addr(id_priv);
 821         memcpy(&addr->sib_addr, &sgid, sizeof(sgid));
 822         cma_translate_ib(addr, &id_priv->id.route.addr.dev_addr);
 823         return 0;
 824 }
 825
 826 static void cma_id_get(struct rdma_id_private *id_priv)
 827 {
 828         refcount_inc(&id_priv->refcount);
 829 }
 830
 831 static void cma_id_put(struct rdma_id_private *id_priv)
 832 {
 833         if (refcount_dec_and_test(&id_priv->refcount))
 834                 complete(&id_priv->comp);
 835 }
 836
 837 static struct rdma_id_private *
 838 __rdma_create_id(struct net *net, rdma_cm_event_handler event_handler,
 839                  void *context, enum rdma_ucm_port_space ps,
 840                  enum ib_qp_type qp_type, const struct rdma_id_private *parent)
 841 {
 842         struct rdma_id_private *id_priv;
 843
 844         id_priv = kzalloc(sizeof *id_priv, GFP_KERNEL);
 845         if (!id_priv)
 846                 return ERR_PTR(-ENOMEM);
 847
 848         id_priv->state = RDMA_CM_IDLE;
 849         id_priv->id.context = context;
 850         id_priv->id.event_handler = event_handler;
 851         id_priv->id.ps = ps;
 852         id_priv->id.qp_type = qp_type;
 853         id_priv->tos_set = false;
 854         id_priv->timeout_set = false;
 855         id_priv->gid_type = IB_GID_TYPE_IB;
 856         spin_lock_init(&id_priv->lock);
 857         mutex_init(&id_priv->qp_mutex);
 858         init_completion(&id_priv->comp);
 859         refcount_set(&id_priv->refcount, 1);
 860         mutex_init(&id_priv->handler_mutex);
 861         INIT_LIST_HEAD(&id_priv->listen_list);
 862         INIT_LIST_HEAD(&id_priv->mc_list);
 863         get_random_bytes(&id_priv->seq_num, sizeof id_priv->seq_num);
 864         id_priv->id.route.addr.dev_addr.net = get_net(net);
 865         id_priv->seq_num &= 0x00ffffff;
 866
 867         rdma_restrack_new(&id_priv->res, RDMA_RESTRACK_CM_ID);
 868         if (parent)
 869                 rdma_restrack_parent_name(&id_priv->res, &parent->res);
 870
 871         return id_priv;
 872 }
 873
 874 struct rdma_cm_id *
 875 __rdma_create_kernel_id(struct net *net, rdma_cm_event_handler event_handler,
 876                         void *context, enum rdma_ucm_port_space ps,
 877                         enum ib_qp_type qp_type, const char *caller)
 878 {
 879         struct rdma_id_private *ret;
 880
 881         ret = __rdma_create_id(net, event_handler, context, ps, qp_type, NULL);
 882         if (IS_ERR(ret))
 883                 return ERR_CAST(ret);
 884
 885         rdma_restrack_set_name(&ret->res, caller);
 886         return &ret->id;
 887 }
 888 EXPORT_SYMBOL(__rdma_create_kernel_id);
 889
 890 struct rdma_cm_id *rdma_create_user_id(rdma_cm_event_handler event_handler,
 891                                        void *context,
 892                                        enum rdma_ucm_port_space ps,
 893                                        enum ib_qp_type qp_type)
 894 {
 895         struct rdma_id_private *ret;
 896
 897         ret = __rdma_create_id(current->nsproxy->net_ns, event_handler, context,
 898                                ps, qp_type, NULL);
 899         if (IS_ERR(ret))
 900                 return ERR_CAST(ret);
 901
 902         rdma_restrack_set_name(&ret->res, NULL);
 903         return &ret->id;
 904 }
 905 EXPORT_SYMBOL(rdma_create_user_id);
 906
 907 static int cma_init_ud_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
 908 {
 909         struct ib_qp_attr qp_attr;
 910         int qp_attr_mask, ret;
 911
 912         qp_attr.qp_state = IB_QPS_INIT;
 913         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 914         if (ret)
 915                 return ret;
 916
 917         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 918         if (ret)
 919                 return ret;
 920
 921         qp_attr.qp_state = IB_QPS_RTR;
 922         ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
 923         if (ret)
 924                 return ret;
 925
 926         qp_attr.qp_state = IB_QPS_RTS;
 927         qp_attr.sq_psn = 0;
 928         ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE | IB_QP_SQ_PSN);
 929
 930         return ret;
 931 }
 932
 933 static int cma_init_conn_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
 934 {
 935         struct ib_qp_attr qp_attr;
 936         int qp_attr_mask, ret;
 937
 938         qp_attr.qp_state = IB_QPS_INIT;
 939         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 940         if (ret)
 941                 return ret;
 942
 943         return ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 944 }
 945
 946 int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
 947                    struct ib_qp_init_attr *qp_init_attr)
 948 {
 949         struct rdma_id_private *id_priv;
 950         struct ib_qp *qp;
 951         int ret;
 952
 953         id_priv = container_of(id, struct rdma_id_private, id);
 954         if (id->device != pd->device) {
 955                 ret = -EINVAL;
 956                 goto out_err;
 957         }
 958
 959         qp_init_attr->port_num = id->port_num;
 960         qp = ib_create_qp(pd, qp_init_attr);
 961         if (IS_ERR(qp)) {
 962                 ret = PTR_ERR(qp);
 963                 goto out_err;
 964         }
 965
 966         if (id->qp_type == IB_QPT_UD)
 967                 ret = cma_init_ud_qp(id_priv, qp);
 968         else
 969                 ret = cma_init_conn_qp(id_priv, qp);
 970         if (ret)
 971                 goto out_destroy;
 972
 973         id->qp = qp;
 974         id_priv->qp_num = qp->qp_num;
 975         id_priv->srq = (qp->srq != NULL);
 976         trace_cm_qp_create(id_priv, pd, qp_init_attr, 0);
 977         return 0;
 978 out_destroy:
 979         ib_destroy_qp(qp);
 980 out_err:
 981         trace_cm_qp_create(id_priv, pd, qp_init_attr, ret);
 982         return ret;
 983 }
 984 EXPORT_SYMBOL(rdma_create_qp);
 985
 986 void rdma_destroy_qp(struct rdma_cm_id *id)
 987 {
 988         struct rdma_id_private *id_priv;
 989
 990         id_priv = container_of(id, struct rdma_id_private, id);
 991         trace_cm_qp_destroy(id_priv);
 992         mutex_lock(&id_priv->qp_mutex);
 993         ib_destroy_qp(id_priv->id.qp);
 994         id_priv->id.qp = NULL;
 995         mutex_unlock(&id_priv->qp_mutex);
 996 }
 997 EXPORT_SYMBOL(rdma_destroy_qp);
 998
 999 static int cma_modify_qp_rtr(struct rdma_id_private *id_priv,
1000                              struct rdma_conn_param *conn_param)
1001 {
1002         struct ib_qp_attr qp_attr;
1003         int qp_attr_mask, ret;
1004
1005         mutex_lock(&id_priv->qp_mutex);
1006         if (!id_priv->id.qp) {
1007                 ret = 0;
1008                 goto out;
1009         }
1010
1011         /* Need to update QP attributes from default values. */
1012         qp_attr.qp_state = IB_QPS_INIT;
1013         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
1014         if (ret)
1015                 goto out;
1016
1017         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
1018         if (ret)
1019                 goto out;
1020
1021         qp_attr.qp_state = IB_QPS_RTR;
1022         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
1023         if (ret)
1024                 goto out;
1025
1026         BUG_ON(id_priv->cma_dev->device != id_priv->id.device);
1027
1028         if (conn_param)
1029                 qp_attr.max_dest_rd_atomic = conn_param->responder_resources;
1030         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
1031 out:
1032         mutex_unlock(&id_priv->qp_mutex);
1033         return ret;
1034 }
1035
1036 static int cma_modify_qp_rts(struct rdma_id_private *id_priv,
1037                              struct rdma_conn_param *conn_param)
1038 {
1039         struct ib_qp_attr qp_attr;
1040         int qp_attr_mask, ret;
1041
1042         mutex_lock(&id_priv->qp_mutex);
1043         if (!id_priv->id.qp) {
1044                 ret = 0;
1045                 goto out;
1046         }
1047
1048         qp_attr.qp_state = IB_QPS_RTS;
1049         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
1050         if (ret)
1051                 goto out;
1052
1053         if (conn_param)
1054                 qp_attr.max_rd_atomic = conn_param->initiator_depth;
1055         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
1056 out:
1057         mutex_unlock(&id_priv->qp_mutex);
1058         return ret;
1059 }
1060
1061 static int cma_modify_qp_err(struct rdma_id_private *id_priv)
1062 {
1063         struct ib_qp_attr qp_attr;
1064         int ret;
1065
1066         mutex_lock(&id_priv->qp_mutex);
1067         if (!id_priv->id.qp) {
1068                 ret = 0;
1069                 goto out;
1070         }
1071
1072         qp_attr.qp_state = IB_QPS_ERR;
1073         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, IB_QP_STATE);
1074 out:
1075         mutex_unlock(&id_priv->qp_mutex);
1076         return ret;
1077 }
1078
1079 static int cma_ib_init_qp_attr(struct rdma_id_private *id_priv,
1080                                struct ib_qp_attr *qp_attr, int *qp_attr_mask)
1081 {
1082         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
1083         int ret;
1084         u16 pkey;
1085
1086         if (rdma_cap_eth_ah(id_priv->id.device, id_priv->id.port_num))
1087                 pkey = 0xffff;
1088         else
1089                 pkey = ib_addr_get_pkey(dev_addr);
1090
1091         ret = ib_find_cached_pkey(id_priv->id.device, id_priv->id.port_num,
1092                                   pkey, &qp_attr->pkey_index);
1093         if (ret)
1094                 return ret;
1095
1096         qp_attr->port_num = id_priv->id.port_num;
1097         *qp_attr_mask = IB_QP_STATE | IB_QP_PKEY_INDEX | IB_QP_PORT;
1098
1099         if (id_priv->id.qp_type == IB_QPT_UD) {
1100                 ret = cma_set_qkey(id_priv, 0);
1101                 if (ret)
1102                         return ret;
1103
1104                 qp_attr->qkey = id_priv->qkey;
1105                 *qp_attr_mask |= IB_QP_QKEY;
1106         } else {
1107                 qp_attr->qp_access_flags = 0;
1108                 *qp_attr_mask |= IB_QP_ACCESS_FLAGS;
1109         }
1110         return 0;
1111 }
1112
1113 int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
1114                        int *qp_attr_mask)
1115 {
1116         struct rdma_id_private *id_priv;
1117         int ret = 0;
1118
1119         id_priv = container_of(id, struct rdma_id_private, id);
1120         if (rdma_cap_ib_cm(id->device, id->port_num)) {
1121                 if (!id_priv->cm_id.ib || (id_priv->id.qp_type == IB_QPT_UD))
1122                         ret = cma_ib_init_qp_attr(id_priv, qp_attr, qp_attr_mask);
1123                 else
1124                         ret = ib_cm_init_qp_attr(id_priv->cm_id.ib, qp_attr,
1125                                                  qp_attr_mask);
1126
1127                 if (qp_attr->qp_state == IB_QPS_RTR)
1128                         qp_attr->rq_psn = id_priv->seq_num;
1129         } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
1130                 if (!id_priv->cm_id.iw) {
1131                         qp_attr->qp_access_flags = 0;
1132                         *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS;
1133                 } else
1134                         ret = iw_cm_init_qp_attr(id_priv->cm_id.iw, qp_attr,
1135                                                  qp_attr_mask);
1136                 qp_attr->port_num = id_priv->id.port_num;
1137                 *qp_attr_mask |= IB_QP_PORT;
1138         } else
1139                 ret = -ENOSYS;
1140
1141         if ((*qp_attr_mask & IB_QP_TIMEOUT) && id_priv->timeout_set)
1142                 qp_attr->timeout = id_priv->timeout;
1143
1144         return ret;
1145 }
1146 EXPORT_SYMBOL(rdma_init_qp_attr);
1147
1148 static inline bool cma_zero_addr(const struct sockaddr *addr)
1149 {
1150         switch (addr->sa_family) {
1151         case AF_INET:
1152                 return ipv4_is_zeronet(((struct sockaddr_in *)addr)->sin_addr.s_addr);
1153         case AF_INET6:
1154                 return ipv6_addr_any(&((struct sockaddr_in6 *)addr)->sin6_addr);
1155         case AF_IB:
1156                 return ib_addr_any(&((struct sockaddr_ib *)addr)->sib_addr);
1157         default:
1158                 return false;
1159         }
1160 }
1161
1162 static inline bool cma_loopback_addr(const struct sockaddr *addr)
1163 {
1164         switch (addr->sa_family) {
1165         case AF_INET:
1166                 return ipv4_is_loopback(
1167                         ((struct sockaddr_in *)addr)->sin_addr.s_addr);
1168         case AF_INET6:
1169                 return ipv6_addr_loopback(
1170                         &((struct sockaddr_in6 *)addr)->sin6_addr);
1171         case AF_IB:
1172                 return ib_addr_loopback(
1173                         &((struct sockaddr_ib *)addr)->sib_addr);
1174         default:
1175                 return false;
1176         }
1177 }
1178
1179 static inline bool cma_any_addr(const struct sockaddr *addr)
1180 {
1181         return cma_zero_addr(addr) || cma_loopback_addr(addr);
1182 }
1183
1184 static int cma_addr_cmp(const struct sockaddr *src, const struct sockaddr *dst)
1185 {
1186         if (src->sa_family != dst->sa_family)
1187                 return -1;
1188
1189         switch (src->sa_family) {
1190         case AF_INET:
1191                 return ((struct sockaddr_in *)src)->sin_addr.s_addr !=
1192                        ((struct sockaddr_in *)dst)->sin_addr.s_addr;
1193         case AF_INET6: {
1194                 struct sockaddr_in6 *src_addr6 = (struct sockaddr_in6 *)src;
1195                 struct sockaddr_in6 *dst_addr6 = (struct sockaddr_in6 *)dst;
1196                 bool link_local;
1197
1198                 if (ipv6_addr_cmp(&src_addr6->sin6_addr,
1199                                           &dst_addr6->sin6_addr))
1200                         return 1;
1201                 link_local = ipv6_addr_type(&dst_addr6->sin6_addr) &
1202                              IPV6_ADDR_LINKLOCAL;
1203                 /* Link local must match their scope_ids */
1204                 return link_local ? (src_addr6->sin6_scope_id !=
1205                                      dst_addr6->sin6_scope_id) :
1206                                     0;
1207         }
1208
1209         default:
1210                 return ib_addr_cmp(&((struct sockaddr_ib *) src)->sib_addr,
1211                                    &((struct sockaddr_ib *) dst)->sib_addr);
1212         }
1213 }
1214
1215 static __be16 cma_port(const struct sockaddr *addr)
1216 {
1217         struct sockaddr_ib *sib;
1218
1219         switch (addr->sa_family) {
1220         case AF_INET:
1221                 return ((struct sockaddr_in *) addr)->sin_port;
1222         case AF_INET6:
1223                 return ((struct sockaddr_in6 *) addr)->sin6_port;
1224         case AF_IB:
1225                 sib = (struct sockaddr_ib *) addr;
1226                 return htons((u16) (be64_to_cpu(sib->sib_sid) &
1227                                     be64_to_cpu(sib->sib_sid_mask)));
1228         default:
1229                 return 0;
1230         }
1231 }
1232
1233 static inline int cma_any_port(const struct sockaddr *addr)
1234 {
1235         return !cma_port(addr);
1236 }
1237
1238 static void cma_save_ib_info(struct sockaddr *src_addr,
1239                              struct sockaddr *dst_addr,
1240                              const struct rdma_cm_id *listen_id,
1241                              const struct sa_path_rec *path)
1242 {
1243         struct sockaddr_ib *listen_ib, *ib;
1244
1245         listen_ib = (struct sockaddr_ib *) &listen_id->route.addr.src_addr;
1246         if (src_addr) {
1247                 ib = (struct sockaddr_ib *)src_addr;
1248                 ib->sib_family = AF_IB;
1249                 if (path) {
1250                         ib->sib_pkey = path->pkey;
1251                         ib->sib_flowinfo = path->flow_label;
1252                         memcpy(&ib->sib_addr, &path->sgid, 16);
1253                         ib->sib_sid = path->service_id;
1254                         ib->sib_scope_id = 0;
1255                 } else {
1256                         ib->sib_pkey = listen_ib->sib_pkey;
1257                         ib->sib_flowinfo = listen_ib->sib_flowinfo;
1258                         ib->sib_addr = listen_ib->sib_addr;
1259                         ib->sib_sid = listen_ib->sib_sid;
1260                         ib->sib_scope_id = listen_ib->sib_scope_id;
1261                 }
1262                 ib->sib_sid_mask = cpu_to_be64(0xffffffffffffffffULL);
1263         }
1264         if (dst_addr) {
1265                 ib = (struct sockaddr_ib *)dst_addr;
1266                 ib->sib_family = AF_IB;
1267                 if (path) {
1268                         ib->sib_pkey = path->pkey;
1269                         ib->sib_flowinfo = path->flow_label;
1270                         memcpy(&ib->sib_addr, &path->dgid, 16);
1271                 }
1272         }
1273 }
1274
1275 static void cma_save_ip4_info(struct sockaddr_in *src_addr,
1276                               struct sockaddr_in *dst_addr,
1277                               struct cma_hdr *hdr,
1278                               __be16 local_port)
1279 {
1280         if (src_addr) {
1281                 *src_addr = (struct sockaddr_in) {
1282                         .sin_family = AF_INET,
1283                         .sin_addr.s_addr = hdr->dst_addr.ip4.addr,
1284                         .sin_port = local_port,
1285                 };
1286         }
1287
1288         if (dst_addr) {
1289                 *dst_addr = (struct sockaddr_in) {
1290                         .sin_family = AF_INET,
1291                         .sin_addr.s_addr = hdr->src_addr.ip4.addr,
1292                         .sin_port = hdr->port,
1293                 };
1294         }
1295 }
1296
1297 static void cma_save_ip6_info(struct sockaddr_in6 *src_addr,
1298                               struct sockaddr_in6 *dst_addr,
1299                               struct cma_hdr *hdr,
1300                               __be16 local_port)
1301 {
1302         if (src_addr) {
1303                 *src_addr = (struct sockaddr_in6) {
1304                         .sin6_family = AF_INET6,
1305                         .sin6_addr = hdr->dst_addr.ip6,
1306                         .sin6_port = local_port,
1307                 };
1308         }
1309
1310         if (dst_addr) {
1311                 *dst_addr = (struct sockaddr_in6) {
1312                         .sin6_family = AF_INET6,
1313                         .sin6_addr = hdr->src_addr.ip6,
1314                         .sin6_port = hdr->port,
1315                 };
1316         }
1317 }
1318
1319 static u16 cma_port_from_service_id(__be64 service_id)
1320 {
1321         return (u16)be64_to_cpu(service_id);
1322 }
1323
1324 static int cma_save_ip_info(struct sockaddr *src_addr,
1325                             struct sockaddr *dst_addr,
1326                             const struct ib_cm_event *ib_event,
1327                             __be64 service_id)
1328 {
1329         struct cma_hdr *hdr;
1330         __be16 port;
1331
1332         hdr = ib_event->private_data;
1333         if (hdr->cma_version != CMA_VERSION)
1334                 return -EINVAL;
1335
1336         port = htons(cma_port_from_service_id(service_id));
1337
1338         switch (cma_get_ip_ver(hdr)) {
1339         case 4:
1340                 cma_save_ip4_info((struct sockaddr_in *)src_addr,
1341                                   (struct sockaddr_in *)dst_addr, hdr, port);
1342                 break;
1343         case 6:
1344                 cma_save_ip6_info((struct sockaddr_in6 *)src_addr,
1345                                   (struct sockaddr_in6 *)dst_addr, hdr, port);
1346                 break;
1347         default:
1348                 return -EAFNOSUPPORT;
1349         }
1350
1351         return 0;
1352 }
1353
1354 static int cma_save_net_info(struct sockaddr *src_addr,
1355                              struct sockaddr *dst_addr,
1356                              const struct rdma_cm_id *listen_id,
1357                              const struct ib_cm_event *ib_event,
1358                              sa_family_t sa_family, __be64 service_id)
1359 {
1360         if (sa_family == AF_IB) {
1361                 if (ib_event->event == IB_CM_REQ_RECEIVED)
1362                         cma_save_ib_info(src_addr, dst_addr, listen_id,
1363                                          ib_event->param.req_rcvd.primary_path);
1364                 else if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED)
1365                         cma_save_ib_info(src_addr, dst_addr, listen_id, NULL);
1366                 return 0;
1367         }
1368
1369         return cma_save_ip_info(src_addr, dst_addr, ib_event, service_id);
1370 }
1371
1372 static int cma_save_req_info(const struct ib_cm_event *ib_event,
1373                              struct cma_req_info *req)
1374 {
1375         const struct ib_cm_req_event_param *req_param =
1376                 &ib_event->param.req_rcvd;
1377         const struct ib_cm_sidr_req_event_param *sidr_param =
1378                 &ib_event->param.sidr_req_rcvd;
1379
1380         switch (ib_event->event) {
1381         case IB_CM_REQ_RECEIVED:
1382                 req->device     = req_param->listen_id->device;
1383                 req->port       = req_param->port;
1384                 memcpy(&req->local_gid, &req_param->primary_path->sgid,
1385                        sizeof(req->local_gid));
1386                 req->has_gid    = true;
1387                 req->service_id = req_param->primary_path->service_id;
1388                 req->pkey       = be16_to_cpu(req_param->primary_path->pkey);
1389                 if (req->pkey != req_param->bth_pkey)
1390                         pr_warn_ratelimited("RDMA CMA: got different BTH P_Key (0x%x) and primary path P_Key (0x%x)\n"
1391                                             "RDMA CMA: in the future this may cause the request to be dropped\n",
1392                                             req_param->bth_pkey, req->pkey);
1393                 break;
1394         case IB_CM_SIDR_REQ_RECEIVED:
1395                 req->device     = sidr_param->listen_id->device;
1396                 req->port       = sidr_param->port;
1397                 req->has_gid    = false;
1398                 req->service_id = sidr_param->service_id;
1399                 req->pkey       = sidr_param->pkey;
1400                 if (req->pkey != sidr_param->bth_pkey)
1401                         pr_warn_ratelimited("RDMA CMA: got different BTH P_Key (0x%x) and SIDR request payload P_Key (0x%x)\n"
1402                                             "RDMA CMA: in the future this may cause the request to be dropped\n",
1403                                             sidr_param->bth_pkey, req->pkey);
1404                 break;
1405         default:
1406                 return -EINVAL;
1407         }
1408
1409         return 0;
1410 }
1411
1412 static bool validate_ipv4_net_dev(struct net_device *net_dev,
1413                                   const struct sockaddr_in *dst_addr,
1414                                   const struct sockaddr_in *src_addr)
1415 {
1416         __be32 daddr = dst_addr->sin_addr.s_addr,
1417                saddr = src_addr->sin_addr.s_addr;
1418         struct fib_result res;
1419         struct flowi4 fl4;
1420         int err;
1421         bool ret;
1422
1423         if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) ||
1424             ipv4_is_lbcast(daddr) || ipv4_is_zeronet(saddr) ||
1425             ipv4_is_zeronet(daddr) || ipv4_is_loopback(daddr) ||
1426             ipv4_is_loopback(saddr))
1427                 return false;
1428
1429         memset(&fl4, 0, sizeof(fl4));
1430         fl4.flowi4_iif = net_dev->ifindex;
1431         fl4.daddr = daddr;
1432         fl4.saddr = saddr;
1433
1434         rcu_read_lock();
1435         err = fib_lookup(dev_net(net_dev), &fl4, &res, 0);
1436         ret = err == 0 && FIB_RES_DEV(res) == net_dev;
1437         rcu_read_unlock();
1438
1439         return ret;
1440 }
1441
1442 static bool validate_ipv6_net_dev(struct net_device *net_dev,
1443                                   const struct sockaddr_in6 *dst_addr,
1444                                   const struct sockaddr_in6 *src_addr)
1445 {
1446 #if IS_ENABLED(CONFIG_IPV6)
1447         const int strict = ipv6_addr_type(&dst_addr->sin6_addr) &
1448                            IPV6_ADDR_LINKLOCAL;
1449         struct rt6_info *rt = rt6_lookup(dev_net(net_dev), &dst_addr->sin6_addr,
1450                                          &src_addr->sin6_addr, net_dev->ifindex,
1451                                          NULL, strict);
1452         bool ret;
1453
1454         if (!rt)
1455                 return false;
1456
1457         ret = rt->rt6i_idev->dev == net_dev;
1458         ip6_rt_put(rt);
1459
1460         return ret;
1461 #else
1462         return false;
1463 #endif
1464 }
1465
1466 static bool validate_net_dev(struct net_device *net_dev,
1467                              const struct sockaddr *daddr,
1468                              const struct sockaddr *saddr)
1469 {
1470         const struct sockaddr_in *daddr4 = (const struct sockaddr_in *)daddr;
1471         const struct sockaddr_in *saddr4 = (const struct sockaddr_in *)saddr;
1472         const struct sockaddr_in6 *daddr6 = (const struct sockaddr_in6 *)daddr;
1473         const struct sockaddr_in6 *saddr6 = (const struct sockaddr_in6 *)saddr;
1474
1475         switch (daddr->sa_family) {
1476         case AF_INET:
1477                 return saddr->sa_family == AF_INET &&
1478                        validate_ipv4_net_dev(net_dev, daddr4, saddr4);
1479
1480         case AF_INET6:
1481                 return saddr->sa_family == AF_INET6 &&
1482                        validate_ipv6_net_dev(net_dev, daddr6, saddr6);
1483
1484         default:
1485                 return false;
1486         }
1487 }
1488
1489 static struct net_device *
1490 roce_get_net_dev_by_cm_event(const struct ib_cm_event *ib_event)
1491 {
1492         const struct ib_gid_attr *sgid_attr = NULL;
1493         struct net_device *ndev;
1494
1495         if (ib_event->event == IB_CM_REQ_RECEIVED)
1496                 sgid_attr = ib_event->param.req_rcvd.ppath_sgid_attr;
1497         else if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED)
1498                 sgid_attr = ib_event->param.sidr_req_rcvd.sgid_attr;
1499
1500         if (!sgid_attr)
1501                 return NULL;
1502
1503         rcu_read_lock();
1504         ndev = rdma_read_gid_attr_ndev_rcu(sgid_attr);
1505         if (IS_ERR(ndev))
1506                 ndev = NULL;
1507         else
1508                 dev_hold(ndev);
1509         rcu_read_unlock();
1510         return ndev;
1511 }
1512
1513 static struct net_device *cma_get_net_dev(const struct ib_cm_event *ib_event,
1514                                           struct cma_req_info *req)
1515 {
1516         struct sockaddr *listen_addr =
1517                         (struct sockaddr *)&req->listen_addr_storage;
1518         struct sockaddr *src_addr = (struct sockaddr *)&req->src_addr_storage;
1519         struct net_device *net_dev;
1520         const union ib_gid *gid = req->has_gid ? &req->local_gid : NULL;
1521         int err;
1522
1523         err = cma_save_ip_info(listen_addr, src_addr, ib_event,
1524                                req->service_id);
1525         if (err)
1526                 return ERR_PTR(err);
1527
1528         if (rdma_protocol_roce(req->device, req->port))
1529                 net_dev = roce_get_net_dev_by_cm_event(ib_event);
1530         else
1531                 net_dev = ib_get_net_dev_by_params(req->device, req->port,
1532                                                    req->pkey,
1533                                                    gid, listen_addr);
1534         if (!net_dev)
1535                 return ERR_PTR(-ENODEV);
1536
1537         return net_dev;
1538 }
1539
1540 static enum rdma_ucm_port_space rdma_ps_from_service_id(__be64 service_id)
1541 {
1542         return (be64_to_cpu(service_id) >> 16) & 0xffff;
1543 }
1544
1545 static bool cma_match_private_data(struct rdma_id_private *id_priv,
1546                                    const struct cma_hdr *hdr)
1547 {
1548         struct sockaddr *addr = cma_src_addr(id_priv);
1549         __be32 ip4_addr;
1550         struct in6_addr ip6_addr;
1551
1552         if (cma_any_addr(addr) && !id_priv->afonly)
1553                 return true;
1554
1555         switch (addr->sa_family) {
1556         case AF_INET:
1557                 ip4_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
1558                 if (cma_get_ip_ver(hdr) != 4)
1559                         return false;
1560                 if (!cma_any_addr(addr) &&
1561                     hdr->dst_addr.ip4.addr != ip4_addr)
1562                         return false;
1563                 break;
1564         case AF_INET6:
1565                 ip6_addr = ((struct sockaddr_in6 *)addr)->sin6_addr;
1566                 if (cma_get_ip_ver(hdr) != 6)
1567                         return false;
1568                 if (!cma_any_addr(addr) &&
1569                     memcmp(&hdr->dst_addr.ip6, &ip6_addr, sizeof(ip6_addr)))
1570                         return false;
1571                 break;
1572         case AF_IB:
1573                 return true;
1574         default:
1575                 return false;
1576         }
1577
1578         return true;
1579 }
1580
1581 static bool cma_protocol_roce(const struct rdma_cm_id *id)
1582 {
1583         struct ib_device *device = id->device;
1584         const int port_num = id->port_num ?: rdma_start_port(device);
1585
1586         return rdma_protocol_roce(device, port_num);
1587 }
1588
1589 static bool cma_is_req_ipv6_ll(const struct cma_req_info *req)
1590 {
1591         const struct sockaddr *daddr =
1592                         (const struct sockaddr *)&req->listen_addr_storage;
1593         const struct sockaddr_in6 *daddr6 = (const struct sockaddr_in6 *)daddr;
1594
1595         /* Returns true if the req is for IPv6 link local */
1596         return (daddr->sa_family == AF_INET6 &&
1597                 (ipv6_addr_type(&daddr6->sin6_addr) & IPV6_ADDR_LINKLOCAL));
1598 }
1599
1600 static bool cma_match_net_dev(const struct rdma_cm_id *id,
1601                               const struct net_device *net_dev,
1602                               const struct cma_req_info *req)
1603 {
1604         const struct rdma_addr *addr = &id->route.addr;
1605
1606         if (!net_dev)
1607                 /* This request is an AF_IB request */
1608                 return (!id->port_num || id->port_num == req->port) &&
1609                        (addr->src_addr.ss_family == AF_IB);
1610
1611         /*
1612          * If the request is not for IPv6 link local, allow matching
1613          * request to any netdevice of the one or multiport rdma device.
1614          */
1615         if (!cma_is_req_ipv6_ll(req))
1616                 return true;
1617         /*
1618          * Net namespaces must match, and if the listner is listening
1619          * on a specific netdevice than netdevice must match as well.
1620          */
1621         if (net_eq(dev_net(net_dev), addr->dev_addr.net) &&
1622             (!!addr->dev_addr.bound_dev_if ==
1623              (addr->dev_addr.bound_dev_if == net_dev->ifindex)))
1624                 return true;
1625         else
1626                 return false;
1627 }
1628
1629 static struct rdma_id_private *cma_find_listener(
1630                 const struct rdma_bind_list *bind_list,
1631                 const struct ib_cm_id *cm_id,
1632                 const struct ib_cm_event *ib_event,
1633                 const struct cma_req_info *req,
1634                 const struct net_device *net_dev)
1635 {
1636         struct rdma_id_private *id_priv, *id_priv_dev;
1637
1638         lockdep_assert_held(&lock);
1639
1640         if (!bind_list)
1641                 return ERR_PTR(-EINVAL);
1642
1643         hlist_for_each_entry(id_priv, &bind_list->owners, node) {
1644                 if (cma_match_private_data(id_priv, ib_event->private_data)) {
1645                         if (id_priv->id.device == cm_id->device &&
1646                             cma_match_net_dev(&id_priv->id, net_dev, req))
1647                                 return id_priv;
1648                         list_for_each_entry(id_priv_dev,
1649                                             &id_priv->listen_list,
1650                                             listen_list) {
1651                                 if (id_priv_dev->id.device == cm_id->device &&
1652                                     cma_match_net_dev(&id_priv_dev->id,
1653                                                       net_dev, req))
1654                                         return id_priv_dev;
1655                         }
1656                 }
1657         }
1658
1659         return ERR_PTR(-EINVAL);
1660 }
1661
1662 static struct rdma_id_private *
1663 cma_ib_id_from_event(struct ib_cm_id *cm_id,
1664                      const struct ib_cm_event *ib_event,
1665                      struct cma_req_info *req,
1666                      struct net_device **net_dev)
1667 {
1668         struct rdma_bind_list *bind_list;
1669         struct rdma_id_private *id_priv;
1670         int err;
1671
1672         err = cma_save_req_info(ib_event, req);
1673         if (err)
1674                 return ERR_PTR(err);
1675
1676         *net_dev = cma_get_net_dev(ib_event, req);
1677         if (IS_ERR(*net_dev)) {
1678                 if (PTR_ERR(*net_dev) == -EAFNOSUPPORT) {
1679                         /* Assuming the protocol is AF_IB */
1680                         *net_dev = NULL;
1681                 } else {
1682                         return ERR_CAST(*net_dev);
1683                 }
1684         }
1685
1686         mutex_lock(&lock);
1687         /*
1688          * Net namespace might be getting deleted while route lookup,
1689          * cm_id lookup is in progress. Therefore, perform netdevice
1690          * validation, cm_id lookup under rcu lock.
1691          * RCU lock along with netdevice state check, synchronizes with
1692          * netdevice migrating to different net namespace and also avoids
1693          * case where net namespace doesn't get deleted while lookup is in
1694          * progress.
1695          * If the device state is not IFF_UP, its properties such as ifindex
1696          * and nd_net cannot be trusted to remain valid without rcu lock.
1697          * net/core/dev.c change_net_namespace() ensures to synchronize with
1698          * ongoing operations on net device after device is closed using
1699          * synchronize_net().
1700          */
1701         rcu_read_lock();
1702         if (*net_dev) {
1703                 /*
1704                  * If netdevice is down, it is likely that it is administratively
1705                  * down or it might be migrating to different namespace.
1706                  * In that case avoid further processing, as the net namespace
1707                  * or ifindex may change.
1708                  */
1709                 if (((*net_dev)->flags & IFF_UP) == 0) {
1710                         id_priv = ERR_PTR(-EHOSTUNREACH);
1711                         goto err;
1712                 }
1713
1714                 if (!validate_net_dev(*net_dev,
1715                                  (struct sockaddr *)&req->listen_addr_storage,
1716                                  (struct sockaddr *)&req->src_addr_storage)) {
1717                         id_priv = ERR_PTR(-EHOSTUNREACH);
1718                         goto err;
1719                 }
1720         }
1721
1722         bind_list = cma_ps_find(*net_dev ? dev_net(*net_dev) : &init_net,
1723                                 rdma_ps_from_service_id(req->service_id),
1724                                 cma_port_from_service_id(req->service_id));
1725         id_priv = cma_find_listener(bind_list, cm_id, ib_event, req, *net_dev);
1726 err:
1727         rcu_read_unlock();
1728         mutex_unlock(&lock);
1729         if (IS_ERR(id_priv) && *net_dev) {
1730                 dev_put(*net_dev);
1731                 *net_dev = NULL;
1732         }
1733         return id_priv;
1734 }
1735
1736 static inline u8 cma_user_data_offset(struct rdma_id_private *id_priv)
1737 {
1738         return cma_family(id_priv) == AF_IB ? 0 : sizeof(struct cma_hdr);
1739 }
1740
1741 static void cma_cancel_route(struct rdma_id_private *id_priv)
1742 {
1743         if (rdma_cap_ib_sa(id_priv->id.device, id_priv->id.port_num)) {
1744                 if (id_priv->query)
1745                         ib_sa_cancel_query(id_priv->query_id, id_priv->query);
1746         }
1747 }
1748
1749 static void cma_cancel_listens(struct rdma_id_private *id_priv)
1750 {
1751         struct rdma_id_private *dev_id_priv;
1752
1753         /*
1754          * Remove from listen_any_list to prevent added devices from spawning
1755          * additional listen requests.
1756          */
1757         mutex_lock(&lock);
1758         list_del(&id_priv->list);
1759
1760         while (!list_empty(&id_priv->listen_list)) {
1761                 dev_id_priv = list_entry(id_priv->listen_list.next,
1762                                          struct rdma_id_private, listen_list);
1763                 /* sync with device removal to avoid duplicate destruction */
1764                 list_del_init(&dev_id_priv->list);
1765                 list_del(&dev_id_priv->listen_list);
1766                 mutex_unlock(&lock);
1767
1768                 rdma_destroy_id(&dev_id_priv->id);
1769                 mutex_lock(&lock);
1770         }
1771         mutex_unlock(&lock);
1772 }
1773
1774 static void cma_cancel_operation(struct rdma_id_private *id_priv,
1775                                  enum rdma_cm_state state)
1776 {
1777         switch (state) {
1778         case RDMA_CM_ADDR_QUERY:
1779                 rdma_addr_cancel(&id_priv->id.route.addr.dev_addr);
1780                 break;
1781         case RDMA_CM_ROUTE_QUERY:
1782                 cma_cancel_route(id_priv);
1783                 break;
1784         case RDMA_CM_LISTEN:
1785                 if (cma_any_addr(cma_src_addr(id_priv)) && !id_priv->cma_dev)
1786                         cma_cancel_listens(id_priv);
1787                 break;
1788         default:
1789                 break;
1790         }
1791 }
1792
1793 static void cma_release_port(struct rdma_id_private *id_priv)
1794 {
1795         struct rdma_bind_list *bind_list = id_priv->bind_list;
1796         struct net *net = id_priv->id.route.addr.dev_addr.net;
1797
1798         if (!bind_list)
1799                 return;
1800
1801         mutex_lock(&lock);
1802         hlist_del(&id_priv->node);
1803         if (hlist_empty(&bind_list->owners)) {
1804                 cma_ps_remove(net, bind_list->ps, bind_list->port);
1805                 kfree(bind_list);
1806         }
1807         mutex_unlock(&lock);
1808 }
1809
1810 static void destroy_mc(struct rdma_id_private *id_priv,
1811                        struct cma_multicast *mc)
1812 {
1813         if (rdma_cap_ib_mcast(id_priv->id.device, id_priv->id.port_num))
1814                 ib_sa_free_multicast(mc->sa_mc);
1815
1816         if (rdma_protocol_roce(id_priv->id.device, id_priv->id.port_num)) {
1817                 struct rdma_dev_addr *dev_addr =
1818                         &id_priv->id.route.addr.dev_addr;
1819                 struct net_device *ndev = NULL;
1820
1821                 if (dev_addr->bound_dev_if)
1822                         ndev = dev_get_by_index(dev_addr->net,
1823                                                 dev_addr->bound_dev_if);
1824                 if (ndev) {
1825                         union ib_gid mgid;
1826
1827                         cma_set_mgid(id_priv, (struct sockaddr *)&mc->addr,
1828                                      &mgid);
1829                         cma_igmp_send(ndev, &mgid, false);
1830                         dev_put(ndev);
1831                 }
1832
1833                 cancel_work_sync(&mc->iboe_join.work);
1834         }
1835         kfree(mc);
1836 }
1837
1838 static void cma_leave_mc_groups(struct rdma_id_private *id_priv)
1839 {
1840         struct cma_multicast *mc;
1841
1842         while (!list_empty(&id_priv->mc_list)) {
1843                 mc = list_first_entry(&id_priv->mc_list, struct cma_multicast,
1844                                       list);
1845                 list_del(&mc->list);
1846                 destroy_mc(id_priv, mc);
1847         }
1848 }
1849
1850 static void _destroy_id(struct rdma_id_private *id_priv,
1851                         enum rdma_cm_state state)
1852 {
1853         cma_cancel_operation(id_priv, state);
1854
1855         if (id_priv->cma_dev) {
1856                 if (rdma_cap_ib_cm(id_priv->id.device, 1)) {
1857                         if (id_priv->cm_id.ib)
1858                                 ib_destroy_cm_id(id_priv->cm_id.ib);
1859                 } else if (rdma_cap_iw_cm(id_priv->id.device, 1)) {
1860                         if (id_priv->cm_id.iw)
1861                                 iw_destroy_cm_id(id_priv->cm_id.iw);
1862                 }
1863                 cma_leave_mc_groups(id_priv);
1864                 cma_release_dev(id_priv);
1865         }
1866
1867         cma_release_port(id_priv);
1868         cma_id_put(id_priv);
1869         wait_for_completion(&id_priv->comp);
1870
1871         if (id_priv->internal_id)
1872                 cma_id_put(id_priv->id.context);
1873
1874         kfree(id_priv->id.route.path_rec);
1875
1876         put_net(id_priv->id.route.addr.dev_addr.net);
1877         rdma_restrack_del(&id_priv->res);
1878         kfree(id_priv);
1879 }
1880
1881 /*
1882  * destroy an ID from within the handler_mutex. This ensures that no other
1883  * handlers can start running concurrently.
1884  */
1885 static void destroy_id_handler_unlock(struct rdma_id_private *id_priv)
1886         __releases(&idprv->handler_mutex)
1887 {
1888         enum rdma_cm_state state;
1889         unsigned long flags;
1890
1891         trace_cm_id_destroy(id_priv);
1892
1893         /*
1894          * Setting the state to destroyed under the handler mutex provides a
1895          * fence against calling handler callbacks. If this is invoked due to
1896          * the failure of a handler callback then it guarentees that no future
1897          * handlers will be called.
1898          */
1899         lockdep_assert_held(&id_priv->handler_mutex);
1900         spin_lock_irqsave(&id_priv->lock, flags);
1901         state = id_priv->state;
1902         id_priv->state = RDMA_CM_DESTROYING;
1903         spin_unlock_irqrestore(&id_priv->lock, flags);
1904         mutex_unlock(&id_priv->handler_mutex);
1905         _destroy_id(id_priv, state);
1906 }
1907
1908 void rdma_destroy_id(struct rdma_cm_id *id)
1909 {
1910         struct rdma_id_private *id_priv =
1911                 container_of(id, struct rdma_id_private, id);
1912
1913         mutex_lock(&id_priv->handler_mutex);
1914         destroy_id_handler_unlock(id_priv);
1915 }
1916 EXPORT_SYMBOL(rdma_destroy_id);
1917
1918 static int cma_rep_recv(struct rdma_id_private *id_priv)
1919 {
1920         int ret;
1921
1922         ret = cma_modify_qp_rtr(id_priv, NULL);
1923         if (ret)
1924                 goto reject;
1925
1926         ret = cma_modify_qp_rts(id_priv, NULL);
1927         if (ret)
1928                 goto reject;
1929
1930         trace_cm_send_rtu(id_priv);
1931         ret = ib_send_cm_rtu(id_priv->cm_id.ib, NULL, 0);
1932         if (ret)
1933                 goto reject;
1934
1935         return 0;
1936 reject:
1937         pr_debug_ratelimited("RDMA CM: CONNECT_ERROR: failed to handle reply. status %d\n", ret);
1938         cma_modify_qp_err(id_priv);
1939         trace_cm_send_rej(id_priv);
1940         ib_send_cm_rej(id_priv->cm_id.ib, IB_CM_REJ_CONSUMER_DEFINED,
1941                        NULL, 0, NULL, 0);
1942         return ret;
1943 }
1944
1945 static void cma_set_rep_event_data(struct rdma_cm_event *event,
1946                                    const struct ib_cm_rep_event_param *rep_data,
1947                                    void *private_data)
1948 {
1949         event->param.conn.private_data = private_data;
1950         event->param.conn.private_data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
1951         event->param.conn.responder_resources = rep_data->responder_resources;
1952         event->param.conn.initiator_depth = rep_data->initiator_depth;
1953         event->param.conn.flow_control = rep_data->flow_control;
1954         event->param.conn.rnr_retry_count = rep_data->rnr_retry_count;
1955         event->param.conn.srq = rep_data->srq;
1956         event->param.conn.qp_num = rep_data->remote_qpn;
1957
1958         event->ece.vendor_id = rep_data->ece.vendor_id;
1959         event->ece.attr_mod = rep_data->ece.attr_mod;
1960 }
1961
1962 static int cma_cm_event_handler(struct rdma_id_private *id_priv,
1963                                 struct rdma_cm_event *event)
1964 {
1965         int ret;
1966
1967         lockdep_assert_held(&id_priv->handler_mutex);
1968
1969         trace_cm_event_handler(id_priv, event);
1970         ret = id_priv->id.event_handler(&id_priv->id, event);
1971         trace_cm_event_done(id_priv, event, ret);
1972         return ret;
1973 }
1974
1975 static int cma_ib_handler(struct ib_cm_id *cm_id,
1976                           const struct ib_cm_event *ib_event)
1977 {
1978         struct rdma_id_private *id_priv = cm_id->context;
1979         struct rdma_cm_event event = {};
1980         enum rdma_cm_state state;
1981         int ret;
1982
1983         mutex_lock(&id_priv->handler_mutex);
1984         state = READ_ONCE(id_priv->state);
1985         if ((ib_event->event != IB_CM_TIMEWAIT_EXIT &&
1986              state != RDMA_CM_CONNECT) ||
1987             (ib_event->event == IB_CM_TIMEWAIT_EXIT &&
1988              state != RDMA_CM_DISCONNECT))
1989                 goto out;
1990
1991         switch (ib_event->event) {
1992         case IB_CM_REQ_ERROR:
1993         case IB_CM_REP_ERROR:
1994                 event.event = RDMA_CM_EVENT_UNREACHABLE;
1995                 event.status = -ETIMEDOUT;
1996                 break;
1997         case IB_CM_REP_RECEIVED:
1998                 if (state == RDMA_CM_CONNECT &&
1999                     (id_priv->id.qp_type != IB_QPT_UD)) {
2000                         trace_cm_send_mra(id_priv);
2001                         ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
2002                 }
2003                 if (id_priv->id.qp) {
2004                         event.status = cma_rep_recv(id_priv);
2005                         event.event = event.status ? RDMA_CM_EVENT_CONNECT_ERROR :
2006                                                      RDMA_CM_EVENT_ESTABLISHED;
2007                 } else {
2008                         event.event = RDMA_CM_EVENT_CONNECT_RESPONSE;
2009                 }
2010                 cma_set_rep_event_data(&event, &ib_event->param.rep_rcvd,
2011                                        ib_event->private_data);
2012                 break;
2013         case IB_CM_RTU_RECEIVED:
2014         case IB_CM_USER_ESTABLISHED:
2015                 event.event = RDMA_CM_EVENT_ESTABLISHED;
2016                 break;
2017         case IB_CM_DREQ_ERROR:
2018                 event.status = -ETIMEDOUT;
2019                 fallthrough;
2020         case IB_CM_DREQ_RECEIVED:
2021         case IB_CM_DREP_RECEIVED:
2022                 if (!cma_comp_exch(id_priv, RDMA_CM_CONNECT,
2023                                    RDMA_CM_DISCONNECT))
2024                         goto out;
2025                 event.event = RDMA_CM_EVENT_DISCONNECTED;
2026                 break;
2027         case IB_CM_TIMEWAIT_EXIT:
2028                 event.event = RDMA_CM_EVENT_TIMEWAIT_EXIT;
2029                 break;
2030         case IB_CM_MRA_RECEIVED:
2031                 /* ignore event */
2032                 goto out;
2033         case IB_CM_REJ_RECEIVED:
2034                 pr_debug_ratelimited("RDMA CM: REJECTED: %s\n", rdma_reject_msg(&id_priv->id,
2035                                                                                 ib_event->param.rej_rcvd.reason));
2036                 cma_modify_qp_err(id_priv);
2037                 event.status = ib_event->param.rej_rcvd.reason;
2038                 event.event = RDMA_CM_EVENT_REJECTED;
2039                 event.param.conn.private_data = ib_event->private_data;
2040                 event.param.conn.private_data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
2041                 break;
2042         default:
2043                 pr_err("RDMA CMA: unexpected IB CM event: %d\n",
2044                        ib_event->event);
2045                 goto out;
2046         }
2047
2048         ret = cma_cm_event_handler(id_priv, &event);
2049         if (ret) {
2050                 /* Destroy the CM ID by returning a non-zero value. */
2051                 id_priv->cm_id.ib = NULL;
2052                 destroy_id_handler_unlock(id_priv);
2053                 return ret;
2054         }
2055 out:
2056         mutex_unlock(&id_priv->handler_mutex);
2057         return 0;
2058 }
2059
2060 static struct rdma_id_private *
2061 cma_ib_new_conn_id(const struct rdma_cm_id *listen_id,
2062                    const struct ib_cm_event *ib_event,
2063                    struct net_device *net_dev)
2064 {
2065         struct rdma_id_private *listen_id_priv;
2066         struct rdma_id_private *id_priv;
2067         struct rdma_cm_id *id;
2068         struct rdma_route *rt;
2069         const sa_family_t ss_family = listen_id->route.addr.src_addr.ss_family;
2070         struct sa_path_rec *path = ib_event->param.req_rcvd.primary_path;
2071         const __be64 service_id =
2072                 ib_event->param.req_rcvd.primary_path->service_id;
2073         int ret;
2074
2075         listen_id_priv = container_of(listen_id, struct rdma_id_private, id);
2076         id_priv = __rdma_create_id(listen_id->route.addr.dev_addr.net,
2077                                    listen_id->event_handler, listen_id->context,
2078                                    listen_id->ps,
2079                                    ib_event->param.req_rcvd.qp_type,
2080                                    listen_id_priv);
2081         if (IS_ERR(id_priv))
2082                 return NULL;
2083
2084         id = &id_priv->id;
2085         if (cma_save_net_info((struct sockaddr *)&id->route.addr.src_addr,
2086                               (struct sockaddr *)&id->route.addr.dst_addr,
2087                               listen_id, ib_event, ss_family, service_id))
2088                 goto err;
2089
2090         rt = &id->route;
2091         rt->num_paths = ib_event->param.req_rcvd.alternate_path ? 2 : 1;
2092         rt->path_rec = kmalloc_array(rt->num_paths, sizeof(*rt->path_rec),
2093                                      GFP_KERNEL);
2094         if (!rt->path_rec)
2095                 goto err;
2096
2097         rt->path_rec[0] = *path;
2098         if (rt->num_paths == 2)
2099                 rt->path_rec[1] = *ib_event->param.req_rcvd.alternate_path;
2100
2101         if (net_dev) {
2102                 rdma_copy_src_l2_addr(&rt->addr.dev_addr, net_dev);
2103         } else {
2104                 if (!cma_protocol_roce(listen_id) &&
2105                     cma_any_addr(cma_src_addr(id_priv))) {
2106                         rt->addr.dev_addr.dev_type = ARPHRD_INFINIBAND;
2107                         rdma_addr_set_sgid(&rt->addr.dev_addr, &rt->path_rec[0].sgid);
2108                         ib_addr_set_pkey(&rt->addr.dev_addr, be16_to_cpu(rt->path_rec[0].pkey));
2109                 } else if (!cma_any_addr(cma_src_addr(id_priv))) {
2110                         ret = cma_translate_addr(cma_src_addr(id_priv), &rt->addr.dev_addr);
2111                         if (ret)
2112                                 goto err;
2113                 }
2114         }
2115         rdma_addr_set_dgid(&rt->addr.dev_addr, &rt->path_rec[0].dgid);
2116
2117         id_priv->state = RDMA_CM_CONNECT;
2118         return id_priv;
2119
2120 err:
2121         rdma_destroy_id(id);
2122         return NULL;
2123 }
2124
2125 static struct rdma_id_private *
2126 cma_ib_new_udp_id(const struct rdma_cm_id *listen_id,
2127                   const struct ib_cm_event *ib_event,
2128                   struct net_device *net_dev)
2129 {
2130         const struct rdma_id_private *listen_id_priv;
2131         struct rdma_id_private *id_priv;
2132         struct rdma_cm_id *id;
2133         const sa_family_t ss_family = listen_id->route.addr.src_addr.ss_family;
2134         struct net *net = listen_id->route.addr.dev_addr.net;
2135         int ret;
2136
2137         listen_id_priv = container_of(listen_id, struct rdma_id_private, id);
2138         id_priv = __rdma_create_id(net, listen_id->event_handler,
2139                                    listen_id->context, listen_id->ps, IB_QPT_UD,
2140                                    listen_id_priv);
2141         if (IS_ERR(id_priv))
2142                 return NULL;
2143
2144         id = &id_priv->id;
2145         if (cma_save_net_info((struct sockaddr *)&id->route.addr.src_addr,
2146                               (struct sockaddr *)&id->route.addr.dst_addr,
2147                               listen_id, ib_event, ss_family,
2148                               ib_event->param.sidr_req_rcvd.service_id))
2149                 goto err;
2150
2151         if (net_dev) {
2152                 rdma_copy_src_l2_addr(&id->route.addr.dev_addr, net_dev);
2153         } else {
2154                 if (!cma_any_addr(cma_src_addr(id_priv))) {
2155                         ret = cma_translate_addr(cma_src_addr(id_priv),
2156                                                  &id->route.addr.dev_addr);
2157                         if (ret)
2158                                 goto err;
2159                 }
2160         }
2161
2162         id_priv->state = RDMA_CM_CONNECT;
2163         return id_priv;
2164 err:
2165         rdma_destroy_id(id);
2166         return NULL;
2167 }
2168
2169 static void cma_set_req_event_data(struct rdma_cm_event *event,
2170                                    const struct ib_cm_req_event_param *req_data,
2171                                    void *private_data, int offset)
2172 {
2173         event->param.conn.private_data = private_data + offset;
2174         event->param.conn.private_data_len = IB_CM_REQ_PRIVATE_DATA_SIZE - offset;
2175         event->param.conn.responder_resources = req_data->responder_resources;
2176         event->param.conn.initiator_depth = req_data->initiator_depth;
2177         event->param.conn.flow_control = req_data->flow_control;
2178         event->param.conn.retry_count = req_data->retry_count;
2179         event->param.conn.rnr_retry_count = req_data->rnr_retry_count;
2180         event->param.conn.srq = req_data->srq;
2181         event->param.conn.qp_num = req_data->remote_qpn;
2182
2183         event->ece.vendor_id = req_data->ece.vendor_id;
2184         event->ece.attr_mod = req_data->ece.attr_mod;
2185 }
2186
2187 static int cma_ib_check_req_qp_type(const struct rdma_cm_id *id,
2188                                     const struct ib_cm_event *ib_event)
2189 {
2190         return (((ib_event->event == IB_CM_REQ_RECEIVED) &&
2191                  (ib_event->param.req_rcvd.qp_type == id->qp_type)) ||
2192                 ((ib_event->event == IB_CM_SIDR_REQ_RECEIVED) &&
2193                  (id->qp_type == IB_QPT_UD)) ||
2194                 (!id->qp_type));
2195 }
2196
2197 static int cma_ib_req_handler(struct ib_cm_id *cm_id,
2198                               const struct ib_cm_event *ib_event)
2199 {
2200         struct rdma_id_private *listen_id, *conn_id = NULL;
2201         struct rdma_cm_event event = {};
2202         struct cma_req_info req = {};
2203         struct net_device *net_dev;
2204         u8 offset;
2205         int ret;
2206
2207         listen_id = cma_ib_id_from_event(cm_id, ib_event, &req, &net_dev);
2208         if (IS_ERR(listen_id))
2209                 return PTR_ERR(listen_id);
2210
2211         trace_cm_req_handler(listen_id, ib_event->event);
2212         if (!cma_ib_check_req_qp_type(&listen_id->id, ib_event)) {
2213                 ret = -EINVAL;
2214                 goto net_dev_put;
2215         }
2216
2217         mutex_lock(&listen_id->handler_mutex);
2218         if (READ_ONCE(listen_id->state) != RDMA_CM_LISTEN) {
2219                 ret = -ECONNABORTED;
2220                 goto err_unlock;
2221         }
2222
2223         offset = cma_user_data_offset(listen_id);
2224         event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
2225         if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED) {
2226                 conn_id = cma_ib_new_udp_id(&listen_id->id, ib_event, net_dev);
2227                 event.param.ud.private_data = ib_event->private_data + offset;
2228                 event.param.ud.private_data_len =
2229                                 IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE - offset;
2230         } else {
2231                 conn_id = cma_ib_new_conn_id(&listen_id->id, ib_event, net_dev);
2232                 cma_set_req_event_data(&event, &ib_event->param.req_rcvd,
2233                                        ib_event->private_data, offset);
2234         }
2235         if (!conn_id) {
2236                 ret = -ENOMEM;
2237                 goto err_unlock;
2238         }
2239
2240         mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
2241         ret = cma_ib_acquire_dev(conn_id, listen_id, &req);
2242         if (ret) {
2243                 destroy_id_handler_unlock(conn_id);
2244                 goto err_unlock;
2245         }
2246
2247         conn_id->cm_id.ib = cm_id;
2248         cm_id->context = conn_id;
2249         cm_id->cm_handler = cma_ib_handler;
2250
2251         ret = cma_cm_event_handler(conn_id, &event);
2252         if (ret) {
2253                 /* Destroy the CM ID by returning a non-zero value. */
2254                 conn_id->cm_id.ib = NULL;
2255                 mutex_unlock(&listen_id->handler_mutex);
2256                 destroy_id_handler_unlock(conn_id);
2257                 goto net_dev_put;
2258         }
2259
2260         if (READ_ONCE(conn_id->state) == RDMA_CM_CONNECT &&
2261             conn_id->id.qp_type != IB_QPT_UD) {
2262                 trace_cm_send_mra(cm_id->context);
2263                 ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
2264         }
2265         mutex_unlock(&conn_id->handler_mutex);
2266
2267 err_unlock:
2268         mutex_unlock(&listen_id->handler_mutex);
2269
2270 net_dev_put:
2271         if (net_dev)
2272                 dev_put(net_dev);
2273
2274         return ret;
2275 }
2276
2277 __be64 rdma_get_service_id(struct rdma_cm_id *id, struct sockaddr *addr)
2278 {
2279         if (addr->sa_family == AF_IB)
2280                 return ((struct sockaddr_ib *) addr)->sib_sid;
2281
2282         return cpu_to_be64(((u64)id->ps << 16) + be16_to_cpu(cma_port(addr)));
2283 }
2284 EXPORT_SYMBOL(rdma_get_service_id);
2285
2286 void rdma_read_gids(struct rdma_cm_id *cm_id, union ib_gid *sgid,
2287                     union ib_gid *dgid)
2288 {
2289         struct rdma_addr *addr = &cm_id->route.addr;
2290
2291         if (!cm_id->device) {
2292                 if (sgid)
2293                         memset(sgid, 0, sizeof(*sgid));
2294                 if (dgid)
2295                         memset(dgid, 0, sizeof(*dgid));
2296                 return;
2297         }
2298
2299         if (rdma_protocol_roce(cm_id->device, cm_id->port_num)) {
2300                 if (sgid)
2301                         rdma_ip2gid((struct sockaddr *)&addr->src_addr, sgid);
2302                 if (dgid)
2303                         rdma_ip2gid((struct sockaddr *)&addr->dst_addr, dgid);
2304         } else {
2305                 if (sgid)
2306                         rdma_addr_get_sgid(&addr->dev_addr, sgid);
2307                 if (dgid)
2308                         rdma_addr_get_dgid(&addr->dev_addr, dgid);
2309         }
2310 }
2311 EXPORT_SYMBOL(rdma_read_gids);
2312
2313 static int cma_iw_handler(struct iw_cm_id *iw_id, struct iw_cm_event *iw_event)
2314 {
2315         struct rdma_id_private *id_priv = iw_id->context;
2316         struct rdma_cm_event event = {};
2317         int ret = 0;
2318         struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr;
2319         struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr;
2320
2321         mutex_lock(&id_priv->handler_mutex);
2322         if (READ_ONCE(id_priv->state) != RDMA_CM_CONNECT)
2323                 goto out;
2324
2325         switch (iw_event->event) {
2326         case IW_CM_EVENT_CLOSE:
2327                 event.event = RDMA_CM_EVENT_DISCONNECTED;
2328                 break;
2329         case IW_CM_EVENT_CONNECT_REPLY:
2330                 memcpy(cma_src_addr(id_priv), laddr,
2331                        rdma_addr_size(laddr));
2332                 memcpy(cma_dst_addr(id_priv), raddr,
2333                        rdma_addr_size(raddr));
2334                 switch (iw_event->status) {
2335                 case 0:
2336                         event.event = RDMA_CM_EVENT_ESTABLISHED;
2337                         event.param.conn.initiator_depth = iw_event->ird;
2338                         event.param.conn.responder_resources = iw_event->ord;
2339                         break;
2340                 case -ECONNRESET:
2341                 case -ECONNREFUSED:
2342                         event.event = RDMA_CM_EVENT_REJECTED;
2343                         break;
2344                 case -ETIMEDOUT:
2345                         event.event = RDMA_CM_EVENT_UNREACHABLE;
2346                         break;
2347                 default:
2348                         event.event = RDMA_CM_EVENT_CONNECT_ERROR;
2349                         break;
2350                 }
2351                 break;
2352         case IW_CM_EVENT_ESTABLISHED:
2353                 event.event = RDMA_CM_EVENT_ESTABLISHED;
2354                 event.param.conn.initiator_depth = iw_event->ird;
2355                 event.param.conn.responder_resources = iw_event->ord;
2356                 break;
2357         default:
2358                 goto out;
2359         }
2360
2361         event.status = iw_event->status;
2362         event.param.conn.private_data = iw_event->private_data;
2363         event.param.conn.private_data_len = iw_event->private_data_len;
2364         ret = cma_cm_event_handler(id_priv, &event);
2365         if (ret) {
2366                 /* Destroy the CM ID by returning a non-zero value. */
2367                 id_priv->cm_id.iw = NULL;
2368                 destroy_id_handler_unlock(id_priv);
2369                 return ret;
2370         }
2371
2372 out:
2373         mutex_unlock(&id_priv->handler_mutex);
2374         return ret;
2375 }
2376
2377 static int iw_conn_req_handler(struct iw_cm_id *cm_id,
2378                                struct iw_cm_event *iw_event)
2379 {
2380         struct rdma_id_private *listen_id, *conn_id;
2381         struct rdma_cm_event event = {};
2382         int ret = -ECONNABORTED;
2383         struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr;
2384         struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr;
2385
2386         event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
2387         event.param.conn.private_data = iw_event->private_data;
2388         event.param.conn.private_data_len = iw_event->private_data_len;
2389         event.param.conn.initiator_depth = iw_event->ird;
2390         event.param.conn.responder_resources = iw_event->ord;
2391
2392         listen_id = cm_id->context;
2393
2394         mutex_lock(&listen_id->handler_mutex);
2395         if (READ_ONCE(listen_id->state) != RDMA_CM_LISTEN)
2396                 goto out;
2397
2398         /* Create a new RDMA id for the new IW CM ID */
2399         conn_id = __rdma_create_id(listen_id->id.route.addr.dev_addr.net,
2400                                    listen_id->id.event_handler,
2401                                    listen_id->id.context, RDMA_PS_TCP,
2402                                    IB_QPT_RC, listen_id);
2403         if (IS_ERR(conn_id)) {
2404                 ret = -ENOMEM;
2405                 goto out;
2406         }
2407         mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
2408         conn_id->state = RDMA_CM_CONNECT;
2409
2410         ret = rdma_translate_ip(laddr, &conn_id->id.route.addr.dev_addr);
2411         if (ret) {
2412                 mutex_unlock(&listen_id->handler_mutex);
2413                 destroy_id_handler_unlock(conn_id);
2414                 return ret;
2415         }
2416
2417         ret = cma_iw_acquire_dev(conn_id, listen_id);
2418         if (ret) {
2419                 mutex_unlock(&listen_id->handler_mutex);
2420                 destroy_id_handler_unlock(conn_id);
2421                 return ret;
2422         }
2423
2424         conn_id->cm_id.iw = cm_id;
2425         cm_id->context = conn_id;
2426         cm_id->cm_handler = cma_iw_handler;
2427
2428         memcpy(cma_src_addr(conn_id), laddr, rdma_addr_size(laddr));
2429         memcpy(cma_dst_addr(conn_id), raddr, rdma_addr_size(raddr));
2430
2431         ret = cma_cm_event_handler(conn_id, &event);
2432         if (ret) {
2433                 /* User wants to destroy the CM ID */
2434                 conn_id->cm_id.iw = NULL;
2435                 mutex_unlock(&listen_id->handler_mutex);
2436                 destroy_id_handler_unlock(conn_id);
2437                 return ret;
2438         }
2439
2440         mutex_unlock(&conn_id->handler_mutex);
2441
2442 out:
2443         mutex_unlock(&listen_id->handler_mutex);
2444         return ret;
2445 }
2446
2447 static int cma_ib_listen(struct rdma_id_private *id_priv)
2448 {
2449         struct sockaddr *addr;
2450         struct ib_cm_id *id;
2451         __be64 svc_id;
2452
2453         addr = cma_src_addr(id_priv);
2454         svc_id = rdma_get_service_id(&id_priv->id, addr);
2455         id = ib_cm_insert_listen(id_priv->id.device,
2456                                  cma_ib_req_handler, svc_id);
2457         if (IS_ERR(id))
2458                 return PTR_ERR(id);
2459         id_priv->cm_id.ib = id;
2460
2461         return 0;
2462 }
2463
2464 static int cma_iw_listen(struct rdma_id_private *id_priv, int backlog)
2465 {
2466         int ret;
2467         struct iw_cm_id *id;
2468
2469         id = iw_create_cm_id(id_priv->id.device,
2470                              iw_conn_req_handler,
2471                              id_priv);
2472         if (IS_ERR(id))
2473                 return PTR_ERR(id);
2474
2475         id->tos = id_priv->tos;
2476         id->tos_set = id_priv->tos_set;
2477         id_priv->cm_id.iw = id;
2478
2479         memcpy(&id_priv->cm_id.iw->local_addr, cma_src_addr(id_priv),
2480                rdma_addr_size(cma_src_addr(id_priv)));
2481
2482         ret = iw_cm_listen(id_priv->cm_id.iw, backlog);
2483
2484         if (ret) {
2485                 iw_destroy_cm_id(id_priv->cm_id.iw);
2486                 id_priv->cm_id.iw = NULL;
2487         }
2488
2489         return ret;
2490 }
2491
2492 static int cma_listen_handler(struct rdma_cm_id *id,
2493                               struct rdma_cm_event *event)
2494 {
2495         struct rdma_id_private *id_priv = id->context;
2496
2497         /* Listening IDs are always destroyed on removal */
2498         if (event->event == RDMA_CM_EVENT_DEVICE_REMOVAL)
2499                 return -1;
2500
2501         id->context = id_priv->id.context;
2502         id->event_handler = id_priv->id.event_handler;
2503         trace_cm_event_handler(id_priv, event);
2504         return id_priv->id.event_handler(id, event);
2505 }
2506
2507 static int cma_listen_on_dev(struct rdma_id_private *id_priv,
2508                              struct cma_device *cma_dev,
2509                              struct rdma_id_private **to_destroy)
2510 {
2511         struct rdma_id_private *dev_id_priv;
2512         struct net *net = id_priv->id.route.addr.dev_addr.net;
2513         int ret;
2514
2515         lockdep_assert_held(&lock);
2516
2517         *to_destroy = NULL;
2518         if (cma_family(id_priv) == AF_IB && !rdma_cap_ib_cm(cma_dev->device, 1))
2519                 return 0;
2520
2521         dev_id_priv =
2522                 __rdma_create_id(net, cma_listen_handler, id_priv,
2523                                  id_priv->id.ps, id_priv->id.qp_type, id_priv);
2524         if (IS_ERR(dev_id_priv))
2525                 return PTR_ERR(dev_id_priv);
2526
2527         dev_id_priv->state = RDMA_CM_ADDR_BOUND;
2528         memcpy(cma_src_addr(dev_id_priv), cma_src_addr(id_priv),
2529                rdma_addr_size(cma_src_addr(id_priv)));
2530
2531         _cma_attach_to_dev(dev_id_priv, cma_dev);
2532         cma_id_get(id_priv);
2533         dev_id_priv->internal_id = 1;
2534         dev_id_priv->afonly = id_priv->afonly;
2535         dev_id_priv->tos_set = id_priv->tos_set;
2536         dev_id_priv->tos = id_priv->tos;
2537
2538         ret = rdma_listen(&dev_id_priv->id, id_priv->backlog);
2539         if (ret)
2540                 goto err_listen;
2541         list_add_tail(&dev_id_priv->listen_list, &id_priv->listen_list);
2542         return 0;
2543 err_listen:
2544         /* Caller must destroy this after releasing lock */
2545         *to_destroy = dev_id_priv;
2546         dev_warn(&cma_dev->device->dev, "RDMA CMA: %s, error %d\n", __func__, ret);
2547         return ret;
2548 }
2549
2550 static int cma_listen_on_all(struct rdma_id_private *id_priv)
2551 {
2552         struct rdma_id_private *to_destroy;
2553         struct cma_device *cma_dev;
2554         int ret;
2555
2556         mutex_lock(&lock);
2557         list_add_tail(&id_priv->list, &listen_any_list);
2558         list_for_each_entry(cma_dev, &dev_list, list) {
2559                 ret = cma_listen_on_dev(id_priv, cma_dev, &to_destroy);
2560                 if (ret) {
2561                         /* Prevent racing with cma_process_remove() */
2562                         if (to_destroy)
2563                                 list_del_init(&to_destroy->list);
2564                         goto err_listen;
2565                 }
2566         }
2567         mutex_unlock(&lock);
2568         return 0;
2569
2570 err_listen:
2571         list_del(&id_priv->list);
2572         mutex_unlock(&lock);
2573         if (to_destroy)
2574                 rdma_destroy_id(&to_destroy->id);
2575         return ret;
2576 }
2577
2578 void rdma_set_service_type(struct rdma_cm_id *id, int tos)
2579 {
2580         struct rdma_id_private *id_priv;
2581
2582         id_priv = container_of(id, struct rdma_id_private, id);
2583         id_priv->tos = (u8) tos;
2584         id_priv->tos_set = true;
2585 }
2586 EXPORT_SYMBOL(rdma_set_service_type);
2587
2588 /**
2589  * rdma_set_ack_timeout() - Set the ack timeout of QP associated
2590  *                          with a connection identifier.
2591  * @id: Communication identifier to associated with service type.
2592  * @timeout: Ack timeout to set a QP, expressed as 4.096 * 2^(timeout) usec.
2593  *
2594  * This function should be called before rdma_connect() on active side,
2595  * and on passive side before rdma_accept(). It is applicable to primary
2596  * path only. The timeout will affect the local side of the QP, it is not
2597  * negotiated with remote side and zero disables the timer. In case it is
2598  * set before rdma_resolve_route, the value will also be used to determine
2599  * PacketLifeTime for RoCE.
2600  *
2601  * Return: 0 for success
2602  */
2603 int rdma_set_ack_timeout(struct rdma_cm_id *id, u8 timeout)
2604 {
2605         struct rdma_id_private *id_priv;
2606
2607         if (id->qp_type != IB_QPT_RC)
2608                 return -EINVAL;
2609
2610         id_priv = container_of(id, struct rdma_id_private, id);
2611         id_priv->timeout = timeout;
2612         id_priv->timeout_set = true;
2613
2614         return 0;
2615 }
2616 EXPORT_SYMBOL(rdma_set_ack_timeout);
2617
2618 static void cma_query_handler(int status, struct sa_path_rec *path_rec,
2619                               void *context)
2620 {
2621         struct cma_work *work = context;
2622         struct rdma_route *route;
2623
2624         route = &work->id->id.route;
2625
2626         if (!status) {
2627                 route->num_paths = 1;
2628                 *route->path_rec = *path_rec;
2629         } else {
2630                 work->old_state = RDMA_CM_ROUTE_QUERY;
2631                 work->new_state = RDMA_CM_ADDR_RESOLVED;
2632                 work->event.event = RDMA_CM_EVENT_ROUTE_ERROR;
2633                 work->event.status = status;
2634                 pr_debug_ratelimited("RDMA CM: ROUTE_ERROR: failed to query path. status %d\n",
2635                                      status);
2636         }
2637
2638         queue_work(cma_wq, &work->work);
2639 }
2640
2641 static int cma_query_ib_route(struct rdma_id_private *id_priv,
2642                               unsigned long timeout_ms, struct cma_work *work)
2643 {
2644         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
2645         struct sa_path_rec path_rec;
2646         ib_sa_comp_mask comp_mask;
2647         struct sockaddr_in6 *sin6;
2648         struct sockaddr_ib *sib;
2649
2650         memset(&path_rec, 0, sizeof path_rec);
2651
2652         if (rdma_cap_opa_ah(id_priv->id.device, id_priv->id.port_num))
2653                 path_rec.rec_type = SA_PATH_REC_TYPE_OPA;
2654         else
2655                 path_rec.rec_type = SA_PATH_REC_TYPE_IB;
2656         rdma_addr_get_sgid(dev_addr, &path_rec.sgid);
2657         rdma_addr_get_dgid(dev_addr, &path_rec.dgid);
2658         path_rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
2659         path_rec.numb_path = 1;
2660         path_rec.reversible = 1;
2661         path_rec.service_id = rdma_get_service_id(&id_priv->id,
2662                                                   cma_dst_addr(id_priv));
2663
2664         comp_mask = IB_SA_PATH_REC_DGID | IB_SA_PATH_REC_SGID |
2665                     IB_SA_PATH_REC_PKEY | IB_SA_PATH_REC_NUMB_PATH |
2666                     IB_SA_PATH_REC_REVERSIBLE | IB_SA_PATH_REC_SERVICE_ID;
2667
2668         switch (cma_family(id_priv)) {
2669         case AF_INET:
2670                 path_rec.qos_class = cpu_to_be16((u16) id_priv->tos);
2671                 comp_mask |= IB_SA_PATH_REC_QOS_CLASS;
2672                 break;
2673         case AF_INET6:
2674                 sin6 = (struct sockaddr_in6 *) cma_src_addr(id_priv);
2675                 path_rec.traffic_class = (u8) (be32_to_cpu(sin6->sin6_flowinfo) >> 20);
2676                 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
2677                 break;
2678         case AF_IB:
2679                 sib = (struct sockaddr_ib *) cma_src_addr(id_priv);
2680                 path_rec.traffic_class = (u8) (be32_to_cpu(sib->sib_flowinfo) >> 20);
2681                 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
2682                 break;
2683         }
2684
2685         id_priv->query_id = ib_sa_path_rec_get(&sa_client, id_priv->id.device,
2686                                                id_priv->id.port_num, &path_rec,
2687                                                comp_mask, timeout_ms,
2688                                                GFP_KERNEL, cma_query_handler,
2689                                                work, &id_priv->query);
2690
2691         return (id_priv->query_id < 0) ? id_priv->query_id : 0;
2692 }
2693
2694 static void cma_iboe_join_work_handler(struct work_struct *work)
2695 {
2696         struct cma_multicast *mc =
2697                 container_of(work, struct cma_multicast, iboe_join.work);
2698         struct rdma_cm_event *event = &mc->iboe_join.event;
2699         struct rdma_id_private *id_priv = mc->id_priv;
2700         int ret;
2701
2702         mutex_lock(&id_priv->handler_mutex);
2703         if (READ_ONCE(id_priv->state) == RDMA_CM_DESTROYING ||
2704             READ_ONCE(id_priv->state) == RDMA_CM_DEVICE_REMOVAL)
2705                 goto out_unlock;
2706
2707         ret = cma_cm_event_handler(id_priv, event);
2708         WARN_ON(ret);
2709
2710 out_unlock:
2711         mutex_unlock(&id_priv->handler_mutex);
2712         if (event->event == RDMA_CM_EVENT_MULTICAST_JOIN)
2713                 rdma_destroy_ah_attr(&event->param.ud.ah_attr);
2714 }
2715
2716 static void cma_work_handler(struct work_struct *_work)
2717 {
2718         struct cma_work *work = container_of(_work, struct cma_work, work);
2719         struct rdma_id_private *id_priv = work->id;
2720
2721         mutex_lock(&id_priv->handler_mutex);
2722         if (READ_ONCE(id_priv->state) == RDMA_CM_DESTROYING ||
2723             READ_ONCE(id_priv->state) == RDMA_CM_DEVICE_REMOVAL)
2724                 goto out_unlock;
2725         if (work->old_state != 0 || work->new_state != 0) {
2726                 if (!cma_comp_exch(id_priv, work->old_state, work->new_state))
2727                         goto out_unlock;
2728         }
2729
2730         if (cma_cm_event_handler(id_priv, &work->event)) {
2731                 cma_id_put(id_priv);
2732                 destroy_id_handler_unlock(id_priv);
2733                 goto out_free;
2734         }
2735
2736 out_unlock:
2737         mutex_unlock(&id_priv->handler_mutex);
2738         cma_id_put(id_priv);
2739 out_free:
2740         if (work->event.event == RDMA_CM_EVENT_MULTICAST_JOIN)
2741                 rdma_destroy_ah_attr(&work->event.param.ud.ah_attr);
2742         kfree(work);
2743 }
2744
2745 static void cma_init_resolve_route_work(struct cma_work *work,
2746                                         struct rdma_id_private *id_priv)
2747 {
2748         work->id = id_priv;
2749         INIT_WORK(&work->work, cma_work_handler);
2750         work->old_state = RDMA_CM_ROUTE_QUERY;
2751         work->new_state = RDMA_CM_ROUTE_RESOLVED;
2752         work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
2753 }
2754
2755 static void enqueue_resolve_addr_work(struct cma_work *work,
2756                                       struct rdma_id_private *id_priv)
2757 {
2758         /* Balances with cma_id_put() in cma_work_handler */
2759         cma_id_get(id_priv);
2760
2761         work->id = id_priv;
2762         INIT_WORK(&work->work, cma_work_handler);
2763         work->old_state = RDMA_CM_ADDR_QUERY;
2764         work->new_state = RDMA_CM_ADDR_RESOLVED;
2765         work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
2766
2767         queue_work(cma_wq, &work->work);
2768 }
2769
2770 static int cma_resolve_ib_route(struct rdma_id_private *id_priv,
2771                                 unsigned long timeout_ms)
2772 {
2773         struct rdma_route *route = &id_priv->id.route;
2774         struct cma_work *work;
2775         int ret;
2776
2777         work = kzalloc(sizeof *work, GFP_KERNEL);
2778         if (!work)
2779                 return -ENOMEM;
2780
2781         cma_init_resolve_route_work(work, id_priv);
2782
2783         route->path_rec = kmalloc(sizeof *route->path_rec, GFP_KERNEL);
2784         if (!route->path_rec) {
2785                 ret = -ENOMEM;
2786                 goto err1;
2787         }
2788
2789         ret = cma_query_ib_route(id_priv, timeout_ms, work);
2790         if (ret)
2791                 goto err2;
2792
2793         return 0;
2794 err2:
2795         kfree(route->path_rec);
2796         route->path_rec = NULL;
2797 err1:
2798         kfree(work);
2799         return ret;
2800 }
2801
2802 static enum ib_gid_type cma_route_gid_type(enum rdma_network_type network_type,
2803                                            unsigned long supported_gids,
2804                                            enum ib_gid_type default_gid)
2805 {
2806         if ((network_type == RDMA_NETWORK_IPV4 ||
2807              network_type == RDMA_NETWORK_IPV6) &&
2808             test_bit(IB_GID_TYPE_ROCE_UDP_ENCAP, &supported_gids))
2809                 return IB_GID_TYPE_ROCE_UDP_ENCAP;
2810
2811         return default_gid;
2812 }
2813
2814 /*
2815  * cma_iboe_set_path_rec_l2_fields() is helper function which sets
2816  * path record type based on GID type.
2817  * It also sets up other L2 fields which includes destination mac address
2818  * netdev ifindex, of the path record.
2819  * It returns the netdev of the bound interface for this path record entry.
2820  */
2821 static struct net_device *
2822 cma_iboe_set_path_rec_l2_fields(struct rdma_id_private *id_priv)
2823 {
2824         struct rdma_route *route = &id_priv->id.route;
2825         enum ib_gid_type gid_type = IB_GID_TYPE_ROCE;
2826         struct rdma_addr *addr = &route->addr;
2827         unsigned long supported_gids;
2828         struct net_device *ndev;
2829
2830         if (!addr->dev_addr.bound_dev_if)
2831                 return NULL;
2832
2833         ndev = dev_get_by_index(addr->dev_addr.net,
2834                                 addr->dev_addr.bound_dev_if);
2835         if (!ndev)
2836                 return NULL;
2837
2838         supported_gids = roce_gid_type_mask_support(id_priv->id.device,
2839                                                     id_priv->id.port_num);
2840         gid_type = cma_route_gid_type(addr->dev_addr.network,
2841                                       supported_gids,
2842                                       id_priv->gid_type);
2843         /* Use the hint from IP Stack to select GID Type */
2844         if (gid_type < ib_network_to_gid_type(addr->dev_addr.network))
2845                 gid_type = ib_network_to_gid_type(addr->dev_addr.network);
2846         route->path_rec->rec_type = sa_conv_gid_to_pathrec_type(gid_type);
2847
2848         route->path_rec->roce.route_resolved = true;
2849         sa_path_set_dmac(route->path_rec, addr->dev_addr.dst_dev_addr);
2850         return ndev;
2851 }
2852
2853 int rdma_set_ib_path(struct rdma_cm_id *id,
2854                      struct sa_path_rec *path_rec)
2855 {
2856         struct rdma_id_private *id_priv;
2857         struct net_device *ndev;
2858         int ret;
2859
2860         id_priv = container_of(id, struct rdma_id_private, id);
2861         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
2862                            RDMA_CM_ROUTE_RESOLVED))
2863                 return -EINVAL;
2864
2865         id->route.path_rec = kmemdup(path_rec, sizeof(*path_rec),
2866                                      GFP_KERNEL);
2867         if (!id->route.path_rec) {
2868                 ret = -ENOMEM;
2869                 goto err;
2870         }
2871
2872         if (rdma_protocol_roce(id->device, id->port_num)) {
2873                 ndev = cma_iboe_set_path_rec_l2_fields(id_priv);
2874                 if (!ndev) {
2875                         ret = -ENODEV;
2876                         goto err_free;
2877                 }
2878                 dev_put(ndev);
2879         }
2880
2881         id->route.num_paths = 1;
2882         return 0;
2883
2884 err_free:
2885         kfree(id->route.path_rec);
2886         id->route.path_rec = NULL;
2887 err:
2888         cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_ADDR_RESOLVED);
2889         return ret;
2890 }
2891 EXPORT_SYMBOL(rdma_set_ib_path);
2892
2893 static int cma_resolve_iw_route(struct rdma_id_private *id_priv)
2894 {
2895         struct cma_work *work;
2896
2897         work = kzalloc(sizeof *work, GFP_KERNEL);
2898         if (!work)
2899                 return -ENOMEM;
2900
2901         cma_init_resolve_route_work(work, id_priv);
2902         queue_work(cma_wq, &work->work);
2903         return 0;
2904 }
2905
2906 static int get_vlan_ndev_tc(struct net_device *vlan_ndev, int prio)
2907 {
2908         struct net_device *dev;
2909
2910         dev = vlan_dev_real_dev(vlan_ndev);
2911         if (dev->num_tc)
2912                 return netdev_get_prio_tc_map(dev, prio);
2913
2914         return (vlan_dev_get_egress_qos_mask(vlan_ndev, prio) &
2915                 VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
2916 }
2917
2918 struct iboe_prio_tc_map {
2919         int input_prio;
2920         int output_tc;
2921         bool found;
2922 };
2923
2924 static int get_lower_vlan_dev_tc(struct net_device *dev,
2925                                  struct netdev_nested_priv *priv)
2926 {
2927         struct iboe_prio_tc_map *map = (struct iboe_prio_tc_map *)priv->data;
2928
2929         if (is_vlan_dev(dev))
2930                 map->output_tc = get_vlan_ndev_tc(dev, map->input_prio);
2931         else if (dev->num_tc)
2932                 map->output_tc = netdev_get_prio_tc_map(dev, map->input_prio);
2933         else
2934                 map->output_tc = 0;
2935         /* We are interested only in first level VLAN device, so always
2936          * return 1 to stop iterating over next level devices.
2937          */
2938         map->found = true;
2939         return 1;
2940 }
2941
2942 static int iboe_tos_to_sl(struct net_device *ndev, int tos)
2943 {
2944         struct iboe_prio_tc_map prio_tc_map = {};
2945         int prio = rt_tos2priority(tos);
2946         struct netdev_nested_priv priv;
2947
2948         /* If VLAN device, get it directly from the VLAN netdev */
2949         if (is_vlan_dev(ndev))
2950                 return get_vlan_ndev_tc(ndev, prio);
2951
2952         prio_tc_map.input_prio = prio;
2953         priv.data = (void *)&prio_tc_map;
2954         rcu_read_lock();
2955         netdev_walk_all_lower_dev_rcu(ndev,
2956                                       get_lower_vlan_dev_tc,
2957                                       &priv);
2958         rcu_read_unlock();
2959         /* If map is found from lower device, use it; Otherwise
2960          * continue with the current netdevice to get priority to tc map.
2961          */
2962         if (prio_tc_map.found)
2963                 return prio_tc_map.output_tc;
2964         else if (ndev->num_tc)
2965                 return netdev_get_prio_tc_map(ndev, prio);
2966         else
2967                 return 0;
2968 }
2969
2970 static __be32 cma_get_roce_udp_flow_label(struct rdma_id_private *id_priv)
2971 {
2972         struct sockaddr_in6 *addr6;
2973         u16 dport, sport;
2974         u32 hash, fl;
2975
2976         addr6 = (struct sockaddr_in6 *)cma_src_addr(id_priv);
2977         fl = be32_to_cpu(addr6->sin6_flowinfo) & IB_GRH_FLOWLABEL_MASK;
2978         if ((cma_family(id_priv) != AF_INET6) || !fl) {
2979                 dport = be16_to_cpu(cma_port(cma_dst_addr(id_priv)));
2980                 sport = be16_to_cpu(cma_port(cma_src_addr(id_priv)));
2981                 hash = (u32)sport * 31 + dport;
2982                 fl = hash & IB_GRH_FLOWLABEL_MASK;
2983         }
2984
2985         return cpu_to_be32(fl);
2986 }
2987
2988 static int cma_resolve_iboe_route(struct rdma_id_private *id_priv)
2989 {
2990         struct rdma_route *route = &id_priv->id.route;
2991         struct rdma_addr *addr = &route->addr;
2992         struct cma_work *work;
2993         int ret;
2994         struct net_device *ndev;
2995
2996         u8 default_roce_tos = id_priv->cma_dev->default_roce_tos[id_priv->id.port_num -
2997                                         rdma_start_port(id_priv->cma_dev->device)];
2998         u8 tos = id_priv->tos_set ? id_priv->tos : default_roce_tos;
2999
3000
3001         work = kzalloc(sizeof *work, GFP_KERNEL);
3002         if (!work)
3003                 return -ENOMEM;
3004
3005         route->path_rec = kzalloc(sizeof *route->path_rec, GFP_KERNEL);
3006         if (!route->path_rec) {
3007                 ret = -ENOMEM;
3008                 goto err1;
3009         }
3010
3011         route->num_paths = 1;
3012
3013         ndev = cma_iboe_set_path_rec_l2_fields(id_priv);
3014         if (!ndev) {
3015                 ret = -ENODEV;
3016                 goto err2;
3017         }
3018
3019         rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
3020                     &route->path_rec->sgid);
3021         rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.dst_addr,
3022                     &route->path_rec->dgid);
3023
3024         if (((struct sockaddr *)&id_priv->id.route.addr.dst_addr)->sa_family != AF_IB)
3025                 /* TODO: get the hoplimit from the inet/inet6 device */
3026                 route->path_rec->hop_limit = addr->dev_addr.hoplimit;
3027         else
3028                 route->path_rec->hop_limit = 1;
3029         route->path_rec->reversible = 1;
3030         route->path_rec->pkey = cpu_to_be16(0xffff);
3031         route->path_rec->mtu_selector = IB_SA_EQ;
3032         route->path_rec->sl = iboe_tos_to_sl(ndev, tos);
3033         route->path_rec->traffic_class = tos;
3034         route->path_rec->mtu = iboe_get_mtu(ndev->mtu);
3035         route->path_rec->rate_selector = IB_SA_EQ;
3036         route->path_rec->rate = iboe_get_rate(ndev);
3037         dev_put(ndev);
3038         route->path_rec->packet_life_time_selector = IB_SA_EQ;
3039         /* In case ACK timeout is set, use this value to calculate
3040          * PacketLifeTime.  As per IBTA 12.7.34,
3041          * local ACK timeout = (2 * PacketLifeTime + Local CA’s ACK delay).
3042          * Assuming a negligible local ACK delay, we can use
3043          * PacketLifeTime = local ACK timeout/2
3044          * as a reasonable approximation for RoCE networks.
3045          */
3046         route->path_rec->packet_life_time = id_priv->timeout_set ?
3047                 id_priv->timeout - 1 : CMA_IBOE_PACKET_LIFETIME;
3048
3049         if (!route->path_rec->mtu) {
3050                 ret = -EINVAL;
3051                 goto err2;
3052         }
3053
3054         if (rdma_protocol_roce_udp_encap(id_priv->id.device,
3055                                          id_priv->id.port_num))
3056                 route->path_rec->flow_label =
3057                         cma_get_roce_udp_flow_label(id_priv);
3058
3059         cma_init_resolve_route_work(work, id_priv);
3060         queue_work(cma_wq, &work->work);
3061
3062         return 0;
3063
3064 err2:
3065         kfree(route->path_rec);
3066         route->path_rec = NULL;
3067         route->num_paths = 0;
3068 err1:
3069         kfree(work);
3070         return ret;
3071 }
3072
3073 int rdma_resolve_route(struct rdma_cm_id *id, unsigned long timeout_ms)
3074 {
3075         struct rdma_id_private *id_priv;
3076         int ret;
3077
3078         id_priv = container_of(id, struct rdma_id_private, id);
3079         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED, RDMA_CM_ROUTE_QUERY))
3080                 return -EINVAL;
3081
3082         cma_id_get(id_priv);
3083         if (rdma_cap_ib_sa(id->device, id->port_num))
3084                 ret = cma_resolve_ib_route(id_priv, timeout_ms);
3085         else if (rdma_protocol_roce(id->device, id->port_num))
3086                 ret = cma_resolve_iboe_route(id_priv);
3087         else if (rdma_protocol_iwarp(id->device, id->port_num))
3088                 ret = cma_resolve_iw_route(id_priv);
3089         else
3090                 ret = -ENOSYS;
3091
3092         if (ret)
3093                 goto err;
3094
3095         return 0;
3096 err:
3097         cma_comp_exch(id_priv, RDMA_CM_ROUTE_QUERY, RDMA_CM_ADDR_RESOLVED);
3098         cma_id_put(id_priv);
3099         return ret;
3100 }
3101 EXPORT_SYMBOL(rdma_resolve_route);
3102
3103 static void cma_set_loopback(struct sockaddr *addr)
3104 {
3105         switch (addr->sa_family) {
3106         case AF_INET:
3107                 ((struct sockaddr_in *) addr)->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
3108                 break;
3109         case AF_INET6:
3110                 ipv6_addr_set(&((struct sockaddr_in6 *) addr)->sin6_addr,
3111                               0, 0, 0, htonl(1));
3112                 break;
3113         default:
3114                 ib_addr_set(&((struct sockaddr_ib *) addr)->sib_addr,
3115                             0, 0, 0, htonl(1));
3116                 break;
3117         }
3118 }
3119
3120 static int cma_bind_loopback(struct rdma_id_private *id_priv)
3121 {
3122         struct cma_device *cma_dev, *cur_dev;
3123         union ib_gid gid;
3124         enum ib_port_state port_state;
3125         unsigned int p;
3126         u16 pkey;
3127         int ret;
3128
3129         cma_dev = NULL;
3130         mutex_lock(&lock);
3131         list_for_each_entry(cur_dev, &dev_list, list) {
3132                 if (cma_family(id_priv) == AF_IB &&
3133                     !rdma_cap_ib_cm(cur_dev->device, 1))
3134                         continue;
3135
3136                 if (!cma_dev)
3137                         cma_dev = cur_dev;
3138
3139                 rdma_for_each_port (cur_dev->device, p) {
3140                         if (!ib_get_cached_port_state(cur_dev->device, p, &port_state) &&
3141                             port_state == IB_PORT_ACTIVE) {
3142                                 cma_dev = cur_dev;
3143                                 goto port_found;
3144                         }
3145                 }
3146         }
3147
3148         if (!cma_dev) {
3149                 ret = -ENODEV;
3150                 goto out;
3151         }
3152
3153         p = 1;
3154
3155 port_found:
3156         ret = rdma_query_gid(cma_dev->device, p, 0, &gid);
3157         if (ret)
3158                 goto out;
3159
3160         ret = ib_get_cached_pkey(cma_dev->device, p, 0, &pkey);
3161         if (ret)
3162                 goto out;
3163
3164         id_priv->id.route.addr.dev_addr.dev_type =
3165                 (rdma_protocol_ib(cma_dev->device, p)) ?
3166                 ARPHRD_INFINIBAND : ARPHRD_ETHER;
3167
3168         rdma_addr_set_sgid(&id_priv->id.route.addr.dev_addr, &gid);
3169         ib_addr_set_pkey(&id_priv->id.route.addr.dev_addr, pkey);
3170         id_priv->id.port_num = p;
3171         cma_attach_to_dev(id_priv, cma_dev);
3172         cma_set_loopback(cma_src_addr(id_priv));
3173 out:
3174         mutex_unlock(&lock);
3175         return ret;
3176 }
3177
3178 static void addr_handler(int status, struct sockaddr *src_addr,
3179                          struct rdma_dev_addr *dev_addr, void *context)
3180 {
3181         struct rdma_id_private *id_priv = context;
3182         struct rdma_cm_event event = {};
3183         struct sockaddr *addr;
3184         struct sockaddr_storage old_addr;
3185
3186         mutex_lock(&id_priv->handler_mutex);
3187         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY,
3188                            RDMA_CM_ADDR_RESOLVED))
3189                 goto out;
3190
3191         /*
3192          * Store the previous src address, so that if we fail to acquire
3193          * matching rdma device, old address can be restored back, which helps
3194          * to cancel the cma listen operation correctly.
3195          */
3196         addr = cma_src_addr(id_priv);
3197         memcpy(&old_addr, addr, rdma_addr_size(addr));
3198         memcpy(addr, src_addr, rdma_addr_size(src_addr));
3199         if (!status && !id_priv->cma_dev) {
3200                 status = cma_acquire_dev_by_src_ip(id_priv);
3201                 if (status)
3202                         pr_debug_ratelimited("RDMA CM: ADDR_ERROR: failed to acquire device. status %d\n",
3203                                              status);
3204         } else if (status) {
3205                 pr_debug_ratelimited("RDMA CM: ADDR_ERROR: failed to resolve IP. status %d\n", status);
3206         }
3207
3208         if (status) {
3209                 memcpy(addr, &old_addr,
3210                        rdma_addr_size((struct sockaddr *)&old_addr));
3211                 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
3212                                    RDMA_CM_ADDR_BOUND))
3213                         goto out;
3214                 event.event = RDMA_CM_EVENT_ADDR_ERROR;
3215                 event.status = status;
3216         } else
3217                 event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
3218
3219         if (cma_cm_event_handler(id_priv, &event)) {
3220                 destroy_id_handler_unlock(id_priv);
3221                 return;
3222         }
3223 out:
3224         mutex_unlock(&id_priv->handler_mutex);
3225 }
3226
3227 static int cma_resolve_loopback(struct rdma_id_private *id_priv)
3228 {
3229         struct cma_work *work;
3230         union ib_gid gid;
3231         int ret;
3232
3233         work = kzalloc(sizeof *work, GFP_KERNEL);
3234         if (!work)
3235                 return -ENOMEM;
3236
3237         if (!id_priv->cma_dev) {
3238                 ret = cma_bind_loopback(id_priv);
3239                 if (ret)
3240                         goto err;
3241         }
3242
3243         rdma_addr_get_sgid(&id_priv->id.route.addr.dev_addr, &gid);
3244         rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, &gid);
3245
3246         enqueue_resolve_addr_work(work, id_priv);
3247         return 0;
3248 err:
3249         kfree(work);
3250         return ret;
3251 }
3252
3253 static int cma_resolve_ib_addr(struct rdma_id_private *id_priv)
3254 {
3255         struct cma_work *work;
3256         int ret;
3257
3258         work = kzalloc(sizeof *work, GFP_KERNEL);
3259         if (!work)
3260                 return -ENOMEM;
3261
3262         if (!id_priv->cma_dev) {
3263                 ret = cma_resolve_ib_dev(id_priv);
3264                 if (ret)
3265                         goto err;
3266         }
3267
3268         rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, (union ib_gid *)
3269                 &(((struct sockaddr_ib *) &id_priv->id.route.addr.dst_addr)->sib_addr));
3270
3271         enqueue_resolve_addr_work(work, id_priv);
3272         return 0;
3273 err:
3274         kfree(work);
3275         return ret;
3276 }
3277
3278 static int cma_bind_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
3279                          const struct sockaddr *dst_addr)
3280 {
3281         if (!src_addr || !src_addr->sa_family) {
3282                 src_addr = (struct sockaddr *) &id->route.addr.src_addr;
3283                 src_addr->sa_family = dst_addr->sa_family;
3284                 if (IS_ENABLED(CONFIG_IPV6) &&
3285                     dst_addr->sa_family == AF_INET6) {
3286                         struct sockaddr_in6 *src_addr6 = (struct sockaddr_in6 *) src_addr;
3287                         struct sockaddr_in6 *dst_addr6 = (struct sockaddr_in6 *) dst_addr;
3288                         src_addr6->sin6_scope_id = dst_addr6->sin6_scope_id;
3289                         if (ipv6_addr_type(&dst_addr6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
3290                                 id->route.addr.dev_addr.bound_dev_if = dst_addr6->sin6_scope_id;
3291                 } else if (dst_addr->sa_family == AF_IB) {
3292                         ((struct sockaddr_ib *) src_addr)->sib_pkey =
3293                                 ((struct sockaddr_ib *) dst_addr)->sib_pkey;
3294                 }
3295         }
3296         return rdma_bind_addr(id, src_addr);
3297 }
3298
3299 /*
3300  * If required, resolve the source address for bind and leave the id_priv in
3301  * state RDMA_CM_ADDR_BOUND. This oddly uses the state to determine the prior
3302  * calls made by ULP, a previously bound ID will not be re-bound and src_addr is
3303  * ignored.
3304  */
3305 static int resolve_prepare_src(struct rdma_id_private *id_priv,
3306                                struct sockaddr *src_addr,
3307                                const struct sockaddr *dst_addr)
3308 {
3309         int ret;
3310
3311         memcpy(cma_dst_addr(id_priv), dst_addr, rdma_addr_size(dst_addr));
3312         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_ADDR_QUERY)) {
3313                 /* For a well behaved ULP state will be RDMA_CM_IDLE */
3314                 ret = cma_bind_addr(&id_priv->id, src_addr, dst_addr);
3315                 if (ret)
3316                         goto err_dst;
3317                 if (WARN_ON(!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND,
3318                                            RDMA_CM_ADDR_QUERY))) {
3319                         ret = -EINVAL;
3320                         goto err_dst;
3321                 }
3322         }
3323
3324         if (cma_family(id_priv) != dst_addr->sa_family) {
3325                 ret = -EINVAL;
3326                 goto err_state;
3327         }
3328         return 0;
3329
3330 err_state:
3331         cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY, RDMA_CM_ADDR_BOUND);
3332 err_dst:
3333         memset(cma_dst_addr(id_priv), 0, rdma_addr_size(dst_addr));
3334         return ret;
3335 }
3336
3337 int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
3338                       const struct sockaddr *dst_addr, unsigned long timeout_ms)
3339 {
3340         struct rdma_id_private *id_priv =
3341                 container_of(id, struct rdma_id_private, id);
3342         int ret;
3343
3344         ret = resolve_prepare_src(id_priv, src_addr, dst_addr);
3345         if (ret)
3346                 return ret;
3347
3348         if (cma_any_addr(dst_addr)) {
3349                 ret = cma_resolve_loopback(id_priv);
3350         } else {
3351                 if (dst_addr->sa_family == AF_IB) {
3352                         ret = cma_resolve_ib_addr(id_priv);
3353                 } else {
3354                         ret = rdma_resolve_ip(cma_src_addr(id_priv), dst_addr,
3355                                               &id->route.addr.dev_addr,
3356                                               timeout_ms, addr_handler,
3357                                               false, id_priv);
3358                 }
3359         }
3360         if (ret)
3361                 goto err;
3362
3363         return 0;
3364 err:
3365         cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY, RDMA_CM_ADDR_BOUND);
3366         return ret;
3367 }
3368 EXPORT_SYMBOL(rdma_resolve_addr);
3369
3370 int rdma_set_reuseaddr(struct rdma_cm_id *id, int reuse)
3371 {
3372         struct rdma_id_private *id_priv;
3373         unsigned long flags;
3374         int ret;
3375
3376         id_priv = container_of(id, struct rdma_id_private, id);
3377         spin_lock_irqsave(&id_priv->lock, flags);
3378         if ((reuse && id_priv->state != RDMA_CM_LISTEN) ||
3379             id_priv->state == RDMA_CM_IDLE) {
3380                 id_priv->reuseaddr = reuse;
3381                 ret = 0;
3382         } else {
3383                 ret = -EINVAL;
3384         }
3385         spin_unlock_irqrestore(&id_priv->lock, flags);
3386         return ret;
3387 }
3388 EXPORT_SYMBOL(rdma_set_reuseaddr);
3389
3390 int rdma_set_afonly(struct rdma_cm_id *id, int afonly)
3391 {
3392         struct rdma_id_private *id_priv;
3393         unsigned long flags;
3394         int ret;
3395
3396         id_priv = container_of(id, struct rdma_id_private, id);
3397         spin_lock_irqsave(&id_priv->lock, flags);
3398         if (id_priv->state == RDMA_CM_IDLE || id_priv->state == RDMA_CM_ADDR_BOUND) {
3399                 id_priv->options |= (1 << CMA_OPTION_AFONLY);
3400                 id_priv->afonly = afonly;
3401                 ret = 0;
3402         } else {
3403                 ret = -EINVAL;
3404         }
3405         spin_unlock_irqrestore(&id_priv->lock, flags);
3406         return ret;
3407 }
3408 EXPORT_SYMBOL(rdma_set_afonly);
3409
3410 static void cma_bind_port(struct rdma_bind_list *bind_list,
3411                           struct rdma_id_private *id_priv)
3412 {
3413         struct sockaddr *addr;
3414         struct sockaddr_ib *sib;
3415         u64 sid, mask;
3416         __be16 port;
3417
3418         lockdep_assert_held(&lock);
3419
3420         addr = cma_src_addr(id_priv);
3421         port = htons(bind_list->port);
3422
3423         switch (addr->sa_family) {
3424         case AF_INET:
3425                 ((struct sockaddr_in *) addr)->sin_port = port;
3426                 break;
3427         case AF_INET6:
3428                 ((struct sockaddr_in6 *) addr)->sin6_port = port;
3429                 break;
3430         case AF_IB:
3431                 sib = (struct sockaddr_ib *) addr;
3432                 sid = be64_to_cpu(sib->sib_sid);
3433                 mask = be64_to_cpu(sib->sib_sid_mask);
3434                 sib->sib_sid = cpu_to_be64((sid & mask) | (u64) ntohs(port));
3435                 sib->sib_sid_mask = cpu_to_be64(~0ULL);
3436                 break;
3437         }
3438         id_priv->bind_list = bind_list;
3439         hlist_add_head(&id_priv->node, &bind_list->owners);
3440 }
3441
3442 static int cma_alloc_port(enum rdma_ucm_port_space ps,
3443                           struct rdma_id_private *id_priv, unsigned short snum)
3444 {
3445         struct rdma_bind_list *bind_list;
3446         int ret;
3447
3448         lockdep_assert_held(&lock);
3449
3450         bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL);
3451         if (!bind_list)
3452                 return -ENOMEM;
3453
3454         ret = cma_ps_alloc(id_priv->id.route.addr.dev_addr.net, ps, bind_list,
3455                            snum);
3456         if (ret < 0)
3457                 goto err;
3458
3459         bind_list->ps = ps;
3460         bind_list->port = snum;
3461         cma_bind_port(bind_list, id_priv);
3462         return 0;
3463 err:
3464         kfree(bind_list);
3465         return ret == -ENOSPC ? -EADDRNOTAVAIL : ret;
3466 }
3467
3468 static int cma_port_is_unique(struct rdma_bind_list *bind_list,
3469                               struct rdma_id_private *id_priv)
3470 {
3471         struct rdma_id_private *cur_id;
3472         struct sockaddr  *daddr = cma_dst_addr(id_priv);
3473         struct sockaddr  *saddr = cma_src_addr(id_priv);
3474         __be16 dport = cma_port(daddr);
3475
3476         lockdep_assert_held(&lock);
3477
3478         hlist_for_each_entry(cur_id, &bind_list->owners, node) {
3479                 struct sockaddr  *cur_daddr = cma_dst_addr(cur_id);
3480                 struct sockaddr  *cur_saddr = cma_src_addr(cur_id);
3481                 __be16 cur_dport = cma_port(cur_daddr);
3482
3483                 if (id_priv == cur_id)
3484                         continue;
3485
3486                 /* different dest port -> unique */
3487                 if (!cma_any_port(daddr) &&
3488                     !cma_any_port(cur_daddr) &&
3489                     (dport != cur_dport))
3490                         continue;
3491
3492                 /* different src address -> unique */
3493                 if (!cma_any_addr(saddr) &&
3494                     !cma_any_addr(cur_saddr) &&
3495                     cma_addr_cmp(saddr, cur_saddr))
3496                         continue;
3497
3498                 /* different dst address -> unique */
3499                 if (!cma_any_addr(daddr) &&
3500                     !cma_any_addr(cur_daddr) &&
3501                     cma_addr_cmp(daddr, cur_daddr))
3502                         continue;
3503
3504                 return -EADDRNOTAVAIL;
3505         }
3506         return 0;
3507 }
3508
3509 static int cma_alloc_any_port(enum rdma_ucm_port_space ps,
3510                               struct rdma_id_private *id_priv)
3511 {
3512         static unsigned int last_used_port;
3513         int low, high, remaining;
3514         unsigned int rover;
3515         struct net *net = id_priv->id.route.addr.dev_addr.net;
3516
3517         lockdep_assert_held(&lock);
3518
3519         inet_get_local_port_range(net, &low, &high);
3520         remaining = (high - low) + 1;
3521         rover = prandom_u32() % remaining + low;
3522 retry:
3523         if (last_used_port != rover) {
3524                 struct rdma_bind_list *bind_list;
3525                 int ret;
3526
3527                 bind_list = cma_ps_find(net, ps, (unsigned short)rover);
3528
3529                 if (!bind_list) {
3530                         ret = cma_alloc_port(ps, id_priv, rover);
3531                 } else {
3532                         ret = cma_port_is_unique(bind_list, id_priv);
3533                         if (!ret)
3534                                 cma_bind_port(bind_list, id_priv);
3535                 }
3536                 /*
3537                  * Remember previously used port number in order to avoid
3538                  * re-using same port immediately after it is closed.
3539                  */
3540                 if (!ret)
3541                         last_used_port = rover;
3542                 if (ret != -EADDRNOTAVAIL)
3543                         return ret;
3544         }
3545         if (--remaining) {
3546                 rover++;
3547                 if ((rover < low) || (rover > high))
3548                         rover = low;
3549                 goto retry;
3550         }
3551         return -EADDRNOTAVAIL;
3552 }
3553
3554 /*
3555  * Check that the requested port is available.  This is called when trying to
3556  * bind to a specific port, or when trying to listen on a bound port.  In
3557  * the latter case, the provided id_priv may already be on the bind_list, but
3558  * we still need to check that it's okay to start listening.
3559  */
3560 static int cma_check_port(struct rdma_bind_list *bind_list,
3561                           struct rdma_id_private *id_priv, uint8_t reuseaddr)
3562 {
3563         struct rdma_id_private *cur_id;
3564         struct sockaddr *addr, *cur_addr;
3565
3566         lockdep_assert_held(&lock);
3567
3568         addr = cma_src_addr(id_priv);
3569         hlist_for_each_entry(cur_id, &bind_list->owners, node) {
3570                 if (id_priv == cur_id)
3571                         continue;
3572
3573                 if (reuseaddr && cur_id->reuseaddr)
3574                         continue;
3575
3576                 cur_addr = cma_src_addr(cur_id);
3577                 if (id_priv->afonly && cur_id->afonly &&
3578                     (addr->sa_family != cur_addr->sa_family))
3579                         continue;
3580
3581                 if (cma_any_addr(addr) || cma_any_addr(cur_addr))
3582                         return -EADDRNOTAVAIL;
3583
3584                 if (!cma_addr_cmp(addr, cur_addr))
3585                         return -EADDRINUSE;
3586         }
3587         return 0;
3588 }
3589
3590 static int cma_use_port(enum rdma_ucm_port_space ps,
3591                         struct rdma_id_private *id_priv)
3592 {
3593         struct rdma_bind_list *bind_list;
3594         unsigned short snum;
3595         int ret;
3596
3597         lockdep_assert_held(&lock);
3598
3599         snum = ntohs(cma_port(cma_src_addr(id_priv)));
3600         if (snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
3601                 return -EACCES;
3602
3603         bind_list = cma_ps_find(id_priv->id.route.addr.dev_addr.net, ps, snum);
3604         if (!bind_list) {
3605                 ret = cma_alloc_port(ps, id_priv, snum);
3606         } else {
3607                 ret = cma_check_port(bind_list, id_priv, id_priv->reuseaddr);
3608                 if (!ret)
3609                         cma_bind_port(bind_list, id_priv);
3610         }
3611         return ret;
3612 }
3613
3614 static enum rdma_ucm_port_space
3615 cma_select_inet_ps(struct rdma_id_private *id_priv)
3616 {
3617         switch (id_priv->id.ps) {
3618         case RDMA_PS_TCP:
3619         case RDMA_PS_UDP:
3620         case RDMA_PS_IPOIB:
3621         case RDMA_PS_IB:
3622                 return id_priv->id.ps;
3623         default:
3624
3625                 return 0;
3626         }
3627 }
3628
3629 static enum rdma_ucm_port_space
3630 cma_select_ib_ps(struct rdma_id_private *id_priv)
3631 {
3632         enum rdma_ucm_port_space ps = 0;
3633         struct sockaddr_ib *sib;
3634         u64 sid_ps, mask, sid;
3635
3636         sib = (struct sockaddr_ib *) cma_src_addr(id_priv);
3637         mask = be64_to_cpu(sib->sib_sid_mask) & RDMA_IB_IP_PS_MASK;
3638         sid = be64_to_cpu(sib->sib_sid) & mask;
3639
3640         if ((id_priv->id.ps == RDMA_PS_IB) && (sid == (RDMA_IB_IP_PS_IB & mask))) {
3641                 sid_ps = RDMA_IB_IP_PS_IB;
3642                 ps = RDMA_PS_IB;
3643         } else if (((id_priv->id.ps == RDMA_PS_IB) || (id_priv->id.ps == RDMA_PS_TCP)) &&
3644                    (sid == (RDMA_IB_IP_PS_TCP & mask))) {
3645                 sid_ps = RDMA_IB_IP_PS_TCP;
3646                 ps = RDMA_PS_TCP;
3647         } else if (((id_priv->id.ps == RDMA_PS_IB) || (id_priv->id.ps == RDMA_PS_UDP)) &&
3648                    (sid == (RDMA_IB_IP_PS_UDP & mask))) {
3649                 sid_ps = RDMA_IB_IP_PS_UDP;
3650                 ps = RDMA_PS_UDP;
3651         }
3652
3653         if (ps) {
3654                 sib->sib_sid = cpu_to_be64(sid_ps | ntohs(cma_port((struct sockaddr *) sib)));
3655                 sib->sib_sid_mask = cpu_to_be64(RDMA_IB_IP_PS_MASK |
3656                                                 be64_to_cpu(sib->sib_sid_mask));
3657         }
3658         return ps;
3659 }
3660
3661 static int cma_get_port(struct rdma_id_private *id_priv)
3662 {
3663         enum rdma_ucm_port_space ps;
3664         int ret;
3665
3666         if (cma_family(id_priv) != AF_IB)
3667                 ps = cma_select_inet_ps(id_priv);
3668         else
3669                 ps = cma_select_ib_ps(id_priv);
3670         if (!ps)
3671                 return -EPROTONOSUPPORT;
3672
3673         mutex_lock(&lock);
3674         if (cma_any_port(cma_src_addr(id_priv)))
3675                 ret = cma_alloc_any_port(ps, id_priv);
3676         else
3677                 ret = cma_use_port(ps, id_priv);
3678         mutex_unlock(&lock);
3679
3680         return ret;
3681 }
3682
3683 static int cma_check_linklocal(struct rdma_dev_addr *dev_addr,
3684                                struct sockaddr *addr)
3685 {
3686 #if IS_ENABLED(CONFIG_IPV6)
3687         struct sockaddr_in6 *sin6;
3688
3689         if (addr->sa_family != AF_INET6)
3690                 return 0;
3691
3692         sin6 = (struct sockaddr_in6 *) addr;
3693
3694         if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
3695                 return 0;
3696
3697         if (!sin6->sin6_scope_id)
3698                         return -EINVAL;
3699
3700         dev_addr->bound_dev_if = sin6->sin6_scope_id;
3701 #endif
3702         return 0;
3703 }
3704
3705 int rdma_listen(struct rdma_cm_id *id, int backlog)
3706 {
3707         struct rdma_id_private *id_priv =
3708                 container_of(id, struct rdma_id_private, id);
3709         int ret;
3710
3711         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_LISTEN)) {
3712                 /* For a well behaved ULP state will be RDMA_CM_IDLE */
3713                 id->route.addr.src_addr.ss_family = AF_INET;
3714                 ret = rdma_bind_addr(id, cma_src_addr(id_priv));
3715                 if (ret)
3716                         return ret;
3717                 if (WARN_ON(!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND,
3718                                            RDMA_CM_LISTEN)))
3719                         return -EINVAL;
3720         }
3721
3722         /*
3723          * Once the ID reaches RDMA_CM_LISTEN it is not allowed to be reusable
3724          * any more, and has to be unique in the bind list.
3725          */
3726         if (id_priv->reuseaddr) {
3727                 mutex_lock(&lock);
3728                 ret = cma_check_port(id_priv->bind_list, id_priv, 0);
3729                 if (!ret)
3730                         id_priv->reuseaddr = 0;
3731                 mutex_unlock(&lock);
3732                 if (ret)
3733                         goto err;
3734         }
3735
3736         id_priv->backlog = backlog;
3737         if (id->device) {
3738                 if (rdma_cap_ib_cm(id->device, 1)) {
3739                         ret = cma_ib_listen(id_priv);
3740                         if (ret)
3741                                 goto err;
3742                 } else if (rdma_cap_iw_cm(id->device, 1)) {
3743                         ret = cma_iw_listen(id_priv, backlog);
3744                         if (ret)
3745                                 goto err;
3746                 } else {
3747                         ret = -ENOSYS;
3748                         goto err;
3749                 }
3750         } else {
3751                 ret = cma_listen_on_all(id_priv);
3752                 if (ret)
3753                         goto err;
3754         }
3755
3756         return 0;
3757 err:
3758         id_priv->backlog = 0;
3759         /*
3760          * All the failure paths that lead here will not allow the req_handler's
3761          * to have run.
3762          */
3763         cma_comp_exch(id_priv, RDMA_CM_LISTEN, RDMA_CM_ADDR_BOUND);
3764         return ret;
3765 }
3766 EXPORT_SYMBOL(rdma_listen);
3767
3768 int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr)
3769 {
3770         struct rdma_id_private *id_priv;
3771         int ret;
3772         struct sockaddr  *daddr;
3773
3774         if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6 &&
3775             addr->sa_family != AF_IB)
3776                 return -EAFNOSUPPORT;
3777
3778         id_priv = container_of(id, struct rdma_id_private, id);
3779         if (!cma_comp_exch(id_priv, RDMA_CM_IDLE, RDMA_CM_ADDR_BOUND))
3780                 return -EINVAL;
3781
3782         ret = cma_check_linklocal(&id->route.addr.dev_addr, addr);
3783         if (ret)
3784                 goto err1;
3785
3786         memcpy(cma_src_addr(id_priv), addr, rdma_addr_size(addr));
3787         if (!cma_any_addr(addr)) {
3788                 ret = cma_translate_addr(addr, &id->route.addr.dev_addr);
3789                 if (ret)
3790                         goto err1;
3791
3792                 ret = cma_acquire_dev_by_src_ip(id_priv);
3793                 if (ret)
3794                         goto err1;
3795         }
3796
3797         if (!(id_priv->options & (1 << CMA_OPTION_AFONLY))) {
3798                 if (addr->sa_family == AF_INET)
3799                         id_priv->afonly = 1;
3800 #if IS_ENABLED(CONFIG_IPV6)
3801                 else if (addr->sa_family == AF_INET6) {
3802                         struct net *net = id_priv->id.route.addr.dev_addr.net;
3803
3804                         id_priv->afonly = net->ipv6.sysctl.bindv6only;
3805                 }
3806 #endif
3807         }
3808         daddr = cma_dst_addr(id_priv);
3809         daddr->sa_family = addr->sa_family;
3810
3811         ret = cma_get_port(id_priv);
3812         if (ret)
3813                 goto err2;
3814
3815         return 0;
3816 err2:
3817         if (id_priv->cma_dev)
3818                 cma_release_dev(id_priv);
3819 err1:
3820         cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_IDLE);
3821         return ret;
3822 }
3823 EXPORT_SYMBOL(rdma_bind_addr);
3824
3825 static int cma_format_hdr(void *hdr, struct rdma_id_private *id_priv)
3826 {
3827         struct cma_hdr *cma_hdr;
3828
3829         cma_hdr = hdr;
3830         cma_hdr->cma_version = CMA_VERSION;
3831         if (cma_family(id_priv) == AF_INET) {
3832                 struct sockaddr_in *src4, *dst4;
3833
3834                 src4 = (struct sockaddr_in *) cma_src_addr(id_priv);
3835                 dst4 = (struct sockaddr_in *) cma_dst_addr(id_priv);
3836
3837                 cma_set_ip_ver(cma_hdr, 4);
3838                 cma_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
3839                 cma_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
3840                 cma_hdr->port = src4->sin_port;
3841         } else if (cma_family(id_priv) == AF_INET6) {
3842                 struct sockaddr_in6 *src6, *dst6;
3843
3844                 src6 = (struct sockaddr_in6 *) cma_src_addr(id_priv);
3845                 dst6 = (struct sockaddr_in6 *) cma_dst_addr(id_priv);
3846
3847                 cma_set_ip_ver(cma_hdr, 6);
3848                 cma_hdr->src_addr.ip6 = src6->sin6_addr;
3849                 cma_hdr->dst_addr.ip6 = dst6->sin6_addr;
3850                 cma_hdr->port = src6->sin6_port;
3851         }
3852         return 0;
3853 }
3854
3855 static int cma_sidr_rep_handler(struct ib_cm_id *cm_id,
3856                                 const struct ib_cm_event *ib_event)
3857 {
3858         struct rdma_id_private *id_priv = cm_id->context;
3859         struct rdma_cm_event event = {};
3860         const struct ib_cm_sidr_rep_event_param *rep =
3861                                 &ib_event->param.sidr_rep_rcvd;
3862         int ret;
3863
3864         mutex_lock(&id_priv->handler_mutex);
3865         if (READ_ONCE(id_priv->state) != RDMA_CM_CONNECT)
3866                 goto out;
3867
3868         switch (ib_event->event) {
3869         case IB_CM_SIDR_REQ_ERROR:
3870                 event.event = RDMA_CM_EVENT_UNREACHABLE;
3871                 event.status = -ETIMEDOUT;
3872                 break;
3873         case IB_CM_SIDR_REP_RECEIVED:
3874                 event.param.ud.private_data = ib_event->private_data;
3875                 event.param.ud.private_data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
3876                 if (rep->status != IB_SIDR_SUCCESS) {
3877                         event.event = RDMA_CM_EVENT_UNREACHABLE;
3878                         event.status = ib_event->param.sidr_rep_rcvd.status;
3879                         pr_debug_ratelimited("RDMA CM: UNREACHABLE: bad SIDR reply. status %d\n",
3880                                              event.status);
3881                         break;
3882                 }
3883                 ret = cma_set_qkey(id_priv, rep->qkey);
3884                 if (ret) {
3885                         pr_debug_ratelimited("RDMA CM: ADDR_ERROR: failed to set qkey. status %d\n", ret);
3886                         event.event = RDMA_CM_EVENT_ADDR_ERROR;
3887                         event.status = ret;
3888                         break;
3889                 }
3890                 ib_init_ah_attr_from_path(id_priv->id.device,
3891                                           id_priv->id.port_num,
3892                                           id_priv->id.route.path_rec,
3893                                           &event.param.ud.ah_attr,
3894                                           rep->sgid_attr);
3895                 event.param.ud.qp_num = rep->qpn;
3896                 event.param.ud.qkey = rep->qkey;
3897                 event.event = RDMA_CM_EVENT_ESTABLISHED;
3898                 event.status = 0;
3899                 break;
3900         default:
3901                 pr_err("RDMA CMA: unexpected IB CM event: %d\n",
3902                        ib_event->event);
3903                 goto out;
3904         }
3905
3906         ret = cma_cm_event_handler(id_priv, &event);
3907
3908         rdma_destroy_ah_attr(&event.param.ud.ah_attr);
3909         if (ret) {
3910                 /* Destroy the CM ID by returning a non-zero value. */
3911                 id_priv->cm_id.ib = NULL;
3912                 destroy_id_handler_unlock(id_priv);
3913                 return ret;
3914         }
3915 out:
3916         mutex_unlock(&id_priv->handler_mutex);
3917         return 0;
3918 }
3919
3920 static int cma_resolve_ib_udp(struct rdma_id_private *id_priv,
3921                               struct rdma_conn_param *conn_param)
3922 {
3923         struct ib_cm_sidr_req_param req;
3924         struct ib_cm_id *id;
3925         void *private_data;
3926         u8 offset;
3927         int ret;
3928
3929         memset(&req, 0, sizeof req);
3930         offset = cma_user_data_offset(id_priv);
3931         req.private_data_len = offset + conn_param->private_data_len;
3932         if (req.private_data_len < conn_param->private_data_len)
3933                 return -EINVAL;
3934
3935         if (req.private_data_len) {
3936                 private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
3937                 if (!private_data)
3938                         return -ENOMEM;
3939         } else {
3940                 private_data = NULL;
3941         }
3942
3943         if (conn_param->private_data && conn_param->private_data_len)
3944                 memcpy(private_data + offset, conn_param->private_data,
3945                        conn_param->private_data_len);
3946
3947         if (private_data) {
3948                 ret = cma_format_hdr(private_data, id_priv);
3949                 if (ret)
3950                         goto out;
3951                 req.private_data = private_data;
3952         }
3953
3954         id = ib_create_cm_id(id_priv->id.device, cma_sidr_rep_handler,
3955                              id_priv);
3956         if (IS_ERR(id)) {
3957                 ret = PTR_ERR(id);
3958                 goto out;
3959         }
3960         id_priv->cm_id.ib = id;
3961
3962         req.path = id_priv->id.route.path_rec;
3963         req.sgid_attr = id_priv->id.route.addr.dev_addr.sgid_attr;
3964         req.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
3965         req.timeout_ms = 1 << (CMA_CM_RESPONSE_TIMEOUT - 8);
3966         req.max_cm_retries = CMA_MAX_CM_RETRIES;
3967
3968         trace_cm_send_sidr_req(id_priv);
3969         ret = ib_send_cm_sidr_req(id_priv->cm_id.ib, &req);
3970         if (ret) {
3971                 ib_destroy_cm_id(id_priv->cm_id.ib);
3972                 id_priv->cm_id.ib = NULL;
3973         }
3974 out:
3975         kfree(private_data);
3976         return ret;
3977 }
3978
3979 static int cma_connect_ib(struct rdma_id_private *id_priv,
3980                           struct rdma_conn_param *conn_param)
3981 {
3982         struct ib_cm_req_param req;
3983         struct rdma_route *route;
3984         void *private_data;
3985         struct ib_cm_id *id;
3986         u8 offset;
3987         int ret;
3988
3989         memset(&req, 0, sizeof req);
3990         offset = cma_user_data_offset(id_priv);
3991         req.private_data_len = offset + conn_param->private_data_len;
3992         if (req.private_data_len < conn_param->private_data_len)
3993                 return -EINVAL;
3994
3995         if (req.private_data_len) {
3996                 private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
3997                 if (!private_data)
3998                         return -ENOMEM;
3999         } else {
4000                 private_data = NULL;
4001         }
4002
4003         if (conn_param->private_data && conn_param->private_data_len)
4004                 memcpy(private_data + offset, conn_param->private_data,
4005                        conn_param->private_data_len);
4006
4007         id = ib_create_cm_id(id_priv->id.device, cma_ib_handler, id_priv);
4008         if (IS_ERR(id)) {
4009                 ret = PTR_ERR(id);
4010                 goto out;
4011         }
4012         id_priv->cm_id.ib = id;
4013
4014         route = &id_priv->id.route;
4015         if (private_data) {
4016                 ret = cma_format_hdr(private_data, id_priv);
4017                 if (ret)
4018                         goto out;
4019                 req.private_data = private_data;
4020         }
4021
4022         req.primary_path = &route->path_rec[0];
4023         if (route->num_paths == 2)
4024                 req.alternate_path = &route->path_rec[1];
4025
4026         req.ppath_sgid_attr = id_priv->id.route.addr.dev_addr.sgid_attr;
4027         /* Alternate path SGID attribute currently unsupported */
4028         req.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
4029         req.qp_num = id_priv->qp_num;
4030         req.qp_type = id_priv->id.qp_type;
4031         req.starting_psn = id_priv->seq_num;
4032         req.responder_resources = conn_param->responder_resources;
4033         req.initiator_depth = conn_param->initiator_depth;
4034         req.flow_control = conn_param->flow_control;
4035         req.retry_count = min_t(u8, 7, conn_param->retry_count);
4036         req.rnr_retry_count = min_t(u8, 7, conn_param->rnr_retry_count);
4037         req.remote_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
4038         req.local_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
4039         req.max_cm_retries = CMA_MAX_CM_RETRIES;
4040         req.srq = id_priv->srq ? 1 : 0;
4041         req.ece.vendor_id = id_priv->ece.vendor_id;
4042         req.ece.attr_mod = id_priv->ece.attr_mod;
4043
4044         trace_cm_send_req(id_priv);
4045         ret = ib_send_cm_req(id_priv->cm_id.ib, &req);
4046 out:
4047         if (ret && !IS_ERR(id)) {
4048                 ib_destroy_cm_id(id);
4049                 id_priv->cm_id.ib = NULL;
4050         }
4051
4052         kfree(private_data);
4053         return ret;
4054 }
4055
4056 static int cma_connect_iw(struct rdma_id_private *id_priv,
4057                           struct rdma_conn_param *conn_param)
4058 {
4059         struct iw_cm_id *cm_id;
4060         int ret;
4061         struct iw_cm_conn_param iw_param;
4062
4063         cm_id = iw_create_cm_id(id_priv->id.device, cma_iw_handler, id_priv);
4064         if (IS_ERR(cm_id))
4065                 return PTR_ERR(cm_id);
4066
4067         cm_id->tos = id_priv->tos;
4068         cm_id->tos_set = id_priv->tos_set;
4069         id_priv->cm_id.iw = cm_id;
4070
4071         memcpy(&cm_id->local_addr, cma_src_addr(id_priv),
4072                rdma_addr_size(cma_src_addr(id_priv)));
4073         memcpy(&cm_id->remote_addr, cma_dst_addr(id_priv),
4074                rdma_addr_size(cma_dst_addr(id_priv)));
4075
4076         ret = cma_modify_qp_rtr(id_priv, conn_param);
4077         if (ret)
4078                 goto out;
4079
4080         if (conn_param) {
4081                 iw_param.ord = conn_param->initiator_depth;
4082                 iw_param.ird = conn_param->responder_resources;
4083                 iw_param.private_data = conn_param->private_data;
4084                 iw_param.private_data_len = conn_param->private_data_len;
4085                 iw_param.qpn = id_priv->id.qp ? id_priv->qp_num : conn_param->qp_num;
4086         } else {
4087                 memset(&iw_param, 0, sizeof iw_param);
4088                 iw_param.qpn = id_priv->qp_num;
4089         }
4090         ret = iw_cm_connect(cm_id, &iw_param);
4091 out:
4092         if (ret) {
4093                 iw_destroy_cm_id(cm_id);
4094                 id_priv->cm_id.iw = NULL;
4095         }
4096         return ret;
4097 }
4098
4099 /**
4100  * rdma_connect_locked - Initiate an active connection request.
4101  * @id: Connection identifier to connect.
4102  * @conn_param: Connection information used for connected QPs.
4103  *
4104  * Same as rdma_connect() but can only be called from the
4105  * RDMA_CM_EVENT_ROUTE_RESOLVED handler callback.
4106  */
4107 int rdma_connect_locked(struct rdma_cm_id *id,
4108                         struct rdma_conn_param *conn_param)
4109 {
4110         struct rdma_id_private *id_priv =
4111                 container_of(id, struct rdma_id_private, id);
4112         int ret;
4113
4114         if (!cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_CONNECT))
4115                 return -EINVAL;
4116
4117         if (!id->qp) {
4118                 id_priv->qp_num = conn_param->qp_num;
4119                 id_priv->srq = conn_param->srq;
4120         }
4121
4122         if (rdma_cap_ib_cm(id->device, id->port_num)) {
4123                 if (id->qp_type == IB_QPT_UD)
4124                         ret = cma_resolve_ib_udp(id_priv, conn_param);
4125                 else
4126                         ret = cma_connect_ib(id_priv, conn_param);
4127         } else if (rdma_cap_iw_cm(id->device, id->port_num))
4128                 ret = cma_connect_iw(id_priv, conn_param);
4129         else
4130                 ret = -ENOSYS;
4131         if (ret)
4132                 goto err_state;
4133         return 0;
4134 err_state:
4135         cma_comp_exch(id_priv, RDMA_CM_CONNECT, RDMA_CM_ROUTE_RESOLVED);
4136         return ret;
4137 }
4138 EXPORT_SYMBOL(rdma_connect_locked);
4139
4140 /**
4141  * rdma_connect - Initiate an active connection request.
4142  * @id: Connection identifier to connect.
4143  * @conn_param: Connection information used for connected QPs.
4144  *
4145  * Users must have resolved a route for the rdma_cm_id to connect with by having
4146  * called rdma_resolve_route before calling this routine.
4147  *
4148  * This call will either connect to a remote QP or obtain remote QP information
4149  * for unconnected rdma_cm_id's.  The actual operation is based on the
4150  * rdma_cm_id's port space.
4151  */
4152 int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
4153 {
4154         struct rdma_id_private *id_priv =
4155                 container_of(id, struct rdma_id_private, id);
4156         int ret;
4157
4158         mutex_lock(&id_priv->handler_mutex);
4159         ret = rdma_connect_locked(id, conn_param);
4160         mutex_unlock(&id_priv->handler_mutex);
4161         return ret;
4162 }
4163 EXPORT_SYMBOL(rdma_connect);
4164
4165 /**
4166  * rdma_connect_ece - Initiate an active connection request with ECE data.
4167  * @id: Connection identifier to connect.
4168  * @conn_param: Connection information used for connected QPs.
4169  * @ece: ECE parameters
4170  *
4171  * See rdma_connect() explanation.
4172  */
4173 int rdma_connect_ece(struct rdma_cm_id *id, struct rdma_conn_param *conn_param,
4174                      struct rdma_ucm_ece *ece)
4175 {
4176         struct rdma_id_private *id_priv =
4177                 container_of(id, struct rdma_id_private, id);
4178
4179         id_priv->ece.vendor_id = ece->vendor_id;
4180         id_priv->ece.attr_mod = ece->attr_mod;
4181
4182         return rdma_connect(id, conn_param);
4183 }
4184 EXPORT_SYMBOL(rdma_connect_ece);
4185
4186 static int cma_accept_ib(struct rdma_id_private *id_priv,
4187                          struct rdma_conn_param *conn_param)
4188 {
4189         struct ib_cm_rep_param rep;
4190         int ret;
4191
4192         ret = cma_modify_qp_rtr(id_priv, conn_param);
4193         if (ret)
4194                 goto out;
4195
4196         ret = cma_modify_qp_rts(id_priv, conn_param);
4197         if (ret)
4198                 goto out;
4199
4200         memset(&rep, 0, sizeof rep);
4201         rep.qp_num = id_priv->qp_num;
4202         rep.starting_psn = id_priv->seq_num;
4203         rep.private_data = conn_param->private_data;
4204         rep.private_data_len = conn_param->private_data_len;
4205         rep.responder_resources = conn_param->responder_resources;
4206         rep.initiator_depth = conn_param->initiator_depth;
4207         rep.failover_accepted = 0;
4208         rep.flow_control = conn_param->flow_control;
4209         rep.rnr_retry_count = min_t(u8, 7, conn_param->rnr_retry_count);
4210         rep.srq = id_priv->srq ? 1 : 0;
4211         rep.ece.vendor_id = id_priv->ece.vendor_id;
4212         rep.ece.attr_mod = id_priv->ece.attr_mod;
4213
4214         trace_cm_send_rep(id_priv);
4215         ret = ib_send_cm_rep(id_priv->cm_id.ib, &rep);
4216 out:
4217         return ret;
4218 }
4219
4220 static int cma_accept_iw(struct rdma_id_private *id_priv,
4221                   struct rdma_conn_param *conn_param)
4222 {
4223         struct iw_cm_conn_param iw_param;
4224         int ret;
4225
4226         if (!conn_param)
4227                 return -EINVAL;
4228
4229         ret = cma_modify_qp_rtr(id_priv, conn_param);
4230         if (ret)
4231                 return ret;
4232
4233         iw_param.ord = conn_param->initiator_depth;
4234         iw_param.ird = conn_param->responder_resources;
4235         iw_param.private_data = conn_param->private_data;
4236         iw_param.private_data_len = conn_param->private_data_len;
4237         if (id_priv->id.qp) {
4238                 iw_param.qpn = id_priv->qp_num;
4239         } else
4240                 iw_param.qpn = conn_param->qp_num;
4241
4242         return iw_cm_accept(id_priv->cm_id.iw, &iw_param);
4243 }
4244
4245 static int cma_send_sidr_rep(struct rdma_id_private *id_priv,
4246                              enum ib_cm_sidr_status status, u32 qkey,
4247                              const void *private_data, int private_data_len)
4248 {
4249         struct ib_cm_sidr_rep_param rep;
4250         int ret;
4251
4252         memset(&rep, 0, sizeof rep);
4253         rep.status = status;
4254         if (status == IB_SIDR_SUCCESS) {
4255                 ret = cma_set_qkey(id_priv, qkey);
4256                 if (ret)
4257                         return ret;
4258                 rep.qp_num = id_priv->qp_num;
4259                 rep.qkey = id_priv->qkey;
4260
4261                 rep.ece.vendor_id = id_priv->ece.vendor_id;
4262                 rep.ece.attr_mod = id_priv->ece.attr_mod;
4263         }
4264
4265         rep.private_data = private_data;
4266         rep.private_data_len = private_data_len;
4267
4268         trace_cm_send_sidr_rep(id_priv);
4269         return ib_send_cm_sidr_rep(id_priv->cm_id.ib, &rep);
4270 }
4271
4272 /**
4273  * rdma_accept - Called to accept a connection request or response.
4274  * @id: Connection identifier associated with the request.
4275  * @conn_param: Information needed to establish the connection.  This must be
4276  *   provided if accepting a connection request.  If accepting a connection
4277  *   response, this parameter must be NULL.
4278  *
4279  * Typically, this routine is only called by the listener to accept a connection
4280  * request.  It must also be called on the active side of a connection if the
4281  * user is performing their own QP transitions.
4282  *
4283  * In the case of error, a reject message is sent to the remote side and the
4284  * state of the qp associated with the id is modified to error, such that any
4285  * previously posted receive buffers would be flushed.
4286  *
4287  * This function is for use by kernel ULPs and must be called from under the
4288  * handler callback.
4289  */
4290 int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
4291 {
4292         struct rdma_id_private *id_priv =
4293                 container_of(id, struct rdma_id_private, id);
4294         int ret;
4295
4296         lockdep_assert_held(&id_priv->handler_mutex);
4297
4298         if (READ_ONCE(id_priv->state) != RDMA_CM_CONNECT)
4299                 return -EINVAL;
4300
4301         if (!id->qp && conn_param) {
4302                 id_priv->qp_num = conn_param->qp_num;
4303                 id_priv->srq = conn_param->srq;
4304         }
4305
4306         if (rdma_cap_ib_cm(id->device, id->port_num)) {
4307                 if (id->qp_type == IB_QPT_UD) {
4308                         if (conn_param)
4309                                 ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
4310                                                         conn_param->qkey,
4311                                                         conn_param->private_data,
4312                                                         conn_param->private_data_len);
4313                         else
4314                                 ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
4315                                                         0, NULL, 0);
4316                 } else {
4317                         if (conn_param)
4318                                 ret = cma_accept_ib(id_priv, conn_param);
4319                         else
4320                                 ret = cma_rep_recv(id_priv);
4321                 }
4322         } else if (rdma_cap_iw_cm(id->device, id->port_num))
4323                 ret = cma_accept_iw(id_priv, conn_param);
4324         else
4325                 ret = -ENOSYS;
4326
4327         if (ret)
4328                 goto reject;
4329
4330         return 0;
4331 reject:
4332         cma_modify_qp_err(id_priv);
4333         rdma_reject(id, NULL, 0, IB_CM_REJ_CONSUMER_DEFINED);
4334         return ret;
4335 }
4336 EXPORT_SYMBOL(rdma_accept);
4337
4338 int rdma_accept_ece(struct rdma_cm_id *id, struct rdma_conn_param *conn_param,
4339                     struct rdma_ucm_ece *ece)
4340 {
4341         struct rdma_id_private *id_priv =
4342                 container_of(id, struct rdma_id_private, id);
4343
4344         id_priv->ece.vendor_id = ece->vendor_id;
4345         id_priv->ece.attr_mod = ece->attr_mod;
4346
4347         return rdma_accept(id, conn_param);
4348 }
4349 EXPORT_SYMBOL(rdma_accept_ece);
4350
4351 void rdma_lock_handler(struct rdma_cm_id *id)
4352 {
4353         struct rdma_id_private *id_priv =
4354                 container_of(id, struct rdma_id_private, id);
4355
4356         mutex_lock(&id_priv->handler_mutex);
4357 }
4358 EXPORT_SYMBOL(rdma_lock_handler);
4359
4360 void rdma_unlock_handler(struct rdma_cm_id *id)
4361 {
4362         struct rdma_id_private *id_priv =
4363                 container_of(id, struct rdma_id_private, id);
4364
4365         mutex_unlock(&id_priv->handler_mutex);
4366 }
4367 EXPORT_SYMBOL(rdma_unlock_handler);
4368
4369 int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event)
4370 {
4371         struct rdma_id_private *id_priv;
4372         int ret;
4373
4374         id_priv = container_of(id, struct rdma_id_private, id);
4375         if (!id_priv->cm_id.ib)
4376                 return -EINVAL;
4377
4378         switch (id->device->node_type) {
4379         case RDMA_NODE_IB_CA:
4380                 ret = ib_cm_notify(id_priv->cm_id.ib, event);
4381                 break;
4382         default:
4383                 ret = 0;
4384                 break;
4385         }
4386         return ret;
4387 }
4388 EXPORT_SYMBOL(rdma_notify);
4389
4390 int rdma_reject(struct rdma_cm_id *id, const void *private_data,
4391                 u8 private_data_len, u8 reason)
4392 {
4393         struct rdma_id_private *id_priv;
4394         int ret;
4395
4396         id_priv = container_of(id, struct rdma_id_private, id);
4397         if (!id_priv->cm_id.ib)
4398                 return -EINVAL;
4399
4400         if (rdma_cap_ib_cm(id->device, id->port_num)) {
4401                 if (id->qp_type == IB_QPT_UD) {
4402                         ret = cma_send_sidr_rep(id_priv, IB_SIDR_REJECT, 0,
4403                                                 private_data, private_data_len);
4404                 } else {
4405                         trace_cm_send_rej(id_priv);
4406                         ret = ib_send_cm_rej(id_priv->cm_id.ib, reason, NULL, 0,
4407                                              private_data, private_data_len);
4408                 }
4409         } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
4410                 ret = iw_cm_reject(id_priv->cm_id.iw,
4411                                    private_data, private_data_len);
4412         } else
4413                 ret = -ENOSYS;
4414
4415         return ret;
4416 }
4417 EXPORT_SYMBOL(rdma_reject);
4418
4419 int rdma_disconnect(struct rdma_cm_id *id)
4420 {
4421         struct rdma_id_private *id_priv;
4422         int ret;
4423
4424         id_priv = container_of(id, struct rdma_id_private, id);
4425         if (!id_priv->cm_id.ib)
4426                 return -EINVAL;
4427
4428         if (rdma_cap_ib_cm(id->device, id->port_num)) {
4429                 ret = cma_modify_qp_err(id_priv);
4430                 if (ret)
4431                         goto out;
4432                 /* Initiate or respond to a disconnect. */
4433                 trace_cm_disconnect(id_priv);
4434                 if (ib_send_cm_dreq(id_priv->cm_id.ib, NULL, 0)) {
4435                         if (!ib_send_cm_drep(id_priv->cm_id.ib, NULL, 0))
4436                                 trace_cm_sent_drep(id_priv);
4437                 } else {
4438                         trace_cm_sent_dreq(id_priv);
4439                 }
4440         } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
4441                 ret = iw_cm_disconnect(id_priv->cm_id.iw, 0);
4442         } else
4443                 ret = -EINVAL;
4444
4445 out:
4446         return ret;
4447 }
4448 EXPORT_SYMBOL(rdma_disconnect);
4449
4450 static void cma_make_mc_event(int status, struct rdma_id_private *id_priv,
4451                               struct ib_sa_multicast *multicast,
4452                               struct rdma_cm_event *event,
4453                               struct cma_multicast *mc)
4454 {
4455         struct rdma_dev_addr *dev_addr;
4456         enum ib_gid_type gid_type;
4457         struct net_device *ndev;
4458
4459         if (!status)
4460                 status = cma_set_qkey(id_priv, be32_to_cpu(multicast->rec.qkey));
4461         else
4462                 pr_debug_ratelimited("RDMA CM: MULTICAST_ERROR: failed to join multicast. status %d\n",
4463                                      status);
4464
4465         event->status = status;
4466         event->param.ud.private_data = mc->context;
4467         if (status) {
4468                 event->event = RDMA_CM_EVENT_MULTICAST_ERROR;
4469                 return;
4470         }
4471
4472         dev_addr = &id_priv->id.route.addr.dev_addr;
4473         ndev = dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if);
4474         gid_type =
4475                 id_priv->cma_dev
4476                         ->default_gid_type[id_priv->id.port_num -
4477                                            rdma_start_port(
4478                                                    id_priv->cma_dev->device)];
4479
4480         event->event = RDMA_CM_EVENT_MULTICAST_JOIN;
4481         if (ib_init_ah_from_mcmember(id_priv->id.device, id_priv->id.port_num,
4482                                      &multicast->rec, ndev, gid_type,
4483                                      &event->param.ud.ah_attr)) {
4484                 event->event = RDMA_CM_EVENT_MULTICAST_ERROR;
4485                 goto out;
4486         }
4487
4488         event->param.ud.qp_num = 0xFFFFFF;
4489         event->param.ud.qkey = be32_to_cpu(multicast->rec.qkey);
4490
4491 out:
4492         if (ndev)
4493                 dev_put(ndev);
4494 }
4495
4496 static int cma_ib_mc_handler(int status, struct ib_sa_multicast *multicast)
4497 {
4498         struct cma_multicast *mc = multicast->context;
4499         struct rdma_id_private *id_priv = mc->id_priv;
4500         struct rdma_cm_event event = {};
4501         int ret = 0;
4502
4503         mutex_lock(&id_priv->handler_mutex);
4504         if (READ_ONCE(id_priv->state) == RDMA_CM_DEVICE_REMOVAL ||
4505             READ_ONCE(id_priv->state) == RDMA_CM_DESTROYING)
4506                 goto out;
4507
4508         cma_make_mc_event(status, id_priv, multicast, &event, mc);
4509         ret = cma_cm_event_handler(id_priv, &event);
4510         rdma_destroy_ah_attr(&event.param.ud.ah_attr);
4511         WARN_ON(ret);
4512
4513 out:
4514         mutex_unlock(&id_priv->handler_mutex);
4515         return 0;
4516 }
4517
4518 static void cma_set_mgid(struct rdma_id_private *id_priv,
4519                          struct sockaddr *addr, union ib_gid *mgid)
4520 {
4521         unsigned char mc_map[MAX_ADDR_LEN];
4522         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
4523         struct sockaddr_in *sin = (struct sockaddr_in *) addr;
4524         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) addr;
4525
4526         if (cma_any_addr(addr)) {
4527                 memset(mgid, 0, sizeof *mgid);
4528         } else if ((addr->sa_family == AF_INET6) &&
4529                    ((be32_to_cpu(sin6->sin6_addr.s6_addr32[0]) & 0xFFF0FFFF) ==
4530                                                                  0xFF10A01B)) {
4531                 /* IPv6 address is an SA assigned MGID. */
4532                 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
4533         } else if (addr->sa_family == AF_IB) {
4534                 memcpy(mgid, &((struct sockaddr_ib *) addr)->sib_addr, sizeof *mgid);
4535         } else if (addr->sa_family == AF_INET6) {
4536                 ipv6_ib_mc_map(&sin6->sin6_addr, dev_addr->broadcast, mc_map);
4537                 if (id_priv->id.ps == RDMA_PS_UDP)
4538                         mc_map[7] = 0x01;       /* Use RDMA CM signature */
4539                 *mgid = *(union ib_gid *) (mc_map + 4);
4540         } else {
4541                 ip_ib_mc_map(sin->sin_addr.s_addr, dev_addr->broadcast, mc_map);
4542                 if (id_priv->id.ps == RDMA_PS_UDP)
4543                         mc_map[7] = 0x01;       /* Use RDMA CM signature */
4544                 *mgid = *(union ib_gid *) (mc_map + 4);
4545         }
4546 }
4547
4548 static int cma_join_ib_multicast(struct rdma_id_private *id_priv,
4549                                  struct cma_multicast *mc)
4550 {
4551         struct ib_sa_mcmember_rec rec;
4552         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
4553         ib_sa_comp_mask comp_mask;
4554         int ret;
4555
4556         ib_addr_get_mgid(dev_addr, &rec.mgid);
4557         ret = ib_sa_get_mcmember_rec(id_priv->id.device, id_priv->id.port_num,
4558                                      &rec.mgid, &rec);
4559         if (ret)
4560                 return ret;
4561
4562         ret = cma_set_qkey(id_priv, 0);
4563         if (ret)
4564                 return ret;
4565
4566         cma_set_mgid(id_priv, (struct sockaddr *) &mc->addr, &rec.mgid);
4567         rec.qkey = cpu_to_be32(id_priv->qkey);
4568         rdma_addr_get_sgid(dev_addr, &rec.port_gid);
4569         rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
4570         rec.join_state = mc->join_state;
4571
4572         comp_mask = IB_SA_MCMEMBER_REC_MGID | IB_SA_MCMEMBER_REC_PORT_GID |
4573                     IB_SA_MCMEMBER_REC_PKEY | IB_SA_MCMEMBER_REC_JOIN_STATE |
4574                     IB_SA_MCMEMBER_REC_QKEY | IB_SA_MCMEMBER_REC_SL |
4575                     IB_SA_MCMEMBER_REC_FLOW_LABEL |
4576                     IB_SA_MCMEMBER_REC_TRAFFIC_CLASS;
4577
4578         if (id_priv->id.ps == RDMA_PS_IPOIB)
4579                 comp_mask |= IB_SA_MCMEMBER_REC_RATE |
4580                              IB_SA_MCMEMBER_REC_RATE_SELECTOR |
4581                              IB_SA_MCMEMBER_REC_MTU_SELECTOR |
4582                              IB_SA_MCMEMBER_REC_MTU |
4583                              IB_SA_MCMEMBER_REC_HOP_LIMIT;
4584
4585         mc->sa_mc = ib_sa_join_multicast(&sa_client, id_priv->id.device,
4586                                          id_priv->id.port_num, &rec, comp_mask,
4587                                          GFP_KERNEL, cma_ib_mc_handler, mc);
4588         return PTR_ERR_OR_ZERO(mc->sa_mc);
4589 }
4590
4591 static void cma_iboe_set_mgid(struct sockaddr *addr, union ib_gid *mgid,
4592                               enum ib_gid_type gid_type)
4593 {
4594         struct sockaddr_in *sin = (struct sockaddr_in *)addr;
4595         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr;
4596
4597         if (cma_any_addr(addr)) {
4598                 memset(mgid, 0, sizeof *mgid);
4599         } else if (addr->sa_family == AF_INET6) {
4600                 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
4601         } else {
4602                 mgid->raw[0] =
4603                         (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) ? 0 : 0xff;
4604                 mgid->raw[1] =
4605                         (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) ? 0 : 0x0e;
4606                 mgid->raw[2] = 0;
4607                 mgid->raw[3] = 0;
4608                 mgid->raw[4] = 0;
4609                 mgid->raw[5] = 0;
4610                 mgid->raw[6] = 0;
4611                 mgid->raw[7] = 0;
4612                 mgid->raw[8] = 0;
4613                 mgid->raw[9] = 0;
4614                 mgid->raw[10] = 0xff;
4615                 mgid->raw[11] = 0xff;
4616                 *(__be32 *)(&mgid->raw[12]) = sin->sin_addr.s_addr;
4617         }
4618 }
4619
4620 static int cma_iboe_join_multicast(struct rdma_id_private *id_priv,
4621                                    struct cma_multicast *mc)
4622 {
4623         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
4624         int err = 0;
4625         struct sockaddr *addr = (struct sockaddr *)&mc->addr;
4626         struct net_device *ndev = NULL;
4627         struct ib_sa_multicast ib;
4628         enum ib_gid_type gid_type;
4629         bool send_only;
4630
4631         send_only = mc->join_state == BIT(SENDONLY_FULLMEMBER_JOIN);
4632
4633         if (cma_zero_addr(addr))
4634                 return -EINVAL;
4635
4636         gid_type = id_priv->cma_dev->default_gid_type[id_priv->id.port_num -
4637                    rdma_start_port(id_priv->cma_dev->device)];
4638         cma_iboe_set_mgid(addr, &ib.rec.mgid, gid_type);
4639
4640         ib.rec.pkey = cpu_to_be16(0xffff);
4641         if (id_priv->id.ps == RDMA_PS_UDP)
4642                 ib.rec.qkey = cpu_to_be32(RDMA_UDP_QKEY);
4643
4644         if (dev_addr->bound_dev_if)
4645                 ndev = dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if);
4646         if (!ndev)
4647                 return -ENODEV;
4648
4649         ib.rec.rate = iboe_get_rate(ndev);
4650         ib.rec.hop_limit = 1;
4651         ib.rec.mtu = iboe_get_mtu(ndev->mtu);
4652
4653         if (addr->sa_family == AF_INET) {
4654                 if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) {
4655                         ib.rec.hop_limit = IPV6_DEFAULT_HOPLIMIT;
4656                         if (!send_only) {
4657                                 err = cma_igmp_send(ndev, &ib.rec.mgid,
4658                                                     true);
4659                         }
4660                 }
4661         } else {
4662                 if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP)
4663                         err = -ENOTSUPP;
4664         }
4665         dev_put(ndev);
4666         if (err || !ib.rec.mtu)
4667                 return err ?: -EINVAL;
4668
4669         rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
4670                     &ib.rec.port_gid);
4671         INIT_WORK(&mc->iboe_join.work, cma_iboe_join_work_handler);
4672         cma_make_mc_event(0, id_priv, &ib, &mc->iboe_join.event, mc);
4673         queue_work(cma_wq, &mc->iboe_join.work);
4674         return 0;
4675 }
4676
4677 int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
4678                         u8 join_state, void *context)
4679 {
4680         struct rdma_id_private *id_priv =
4681                 container_of(id, struct rdma_id_private, id);
4682         struct cma_multicast *mc;
4683         int ret;
4684
4685         /* Not supported for kernel QPs */
4686         if (WARN_ON(id->qp))
4687                 return -EINVAL;
4688
4689         /* ULP is calling this wrong. */
4690         if (!id->device || (READ_ONCE(id_priv->state) != RDMA_CM_ADDR_BOUND &&
4691                             READ_ONCE(id_priv->state) != RDMA_CM_ADDR_RESOLVED))
4692                 return -EINVAL;
4693
4694         mc = kzalloc(sizeof(*mc), GFP_KERNEL);
4695         if (!mc)
4696                 return -ENOMEM;
4697
4698         memcpy(&mc->addr, addr, rdma_addr_size(addr));
4699         mc->context = context;
4700         mc->id_priv = id_priv;
4701         mc->join_state = join_state;
4702
4703         if (rdma_protocol_roce(id->device, id->port_num)) {
4704                 ret = cma_iboe_join_multicast(id_priv, mc);
4705                 if (ret)
4706                         goto out_err;
4707         } else if (rdma_cap_ib_mcast(id->device, id->port_num)) {
4708                 ret = cma_join_ib_multicast(id_priv, mc);
4709                 if (ret)
4710                         goto out_err;
4711         } else {
4712                 ret = -ENOSYS;
4713                 goto out_err;
4714         }
4715
4716         spin_lock(&id_priv->lock);
4717         list_add(&mc->list, &id_priv->mc_list);
4718         spin_unlock(&id_priv->lock);
4719
4720         return 0;
4721 out_err:
4722         kfree(mc);
4723         return ret;
4724 }
4725 EXPORT_SYMBOL(rdma_join_multicast);
4726
4727 void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr)
4728 {
4729         struct rdma_id_private *id_priv;
4730         struct cma_multicast *mc;
4731
4732         id_priv = container_of(id, struct rdma_id_private, id);
4733         spin_lock_irq(&id_priv->lock);
4734         list_for_each_entry(mc, &id_priv->mc_list, list) {
4735                 if (memcmp(&mc->addr, addr, rdma_addr_size(addr)) != 0)
4736                         continue;
4737                 list_del(&mc->list);
4738                 spin_unlock_irq(&id_priv->lock);
4739
4740                 WARN_ON(id_priv->cma_dev->device != id->device);
4741                 destroy_mc(id_priv, mc);
4742                 return;
4743         }
4744         spin_unlock_irq(&id_priv->lock);
4745 }
4746 EXPORT_SYMBOL(rdma_leave_multicast);
4747
4748 static int cma_netdev_change(struct net_device *ndev, struct rdma_id_private *id_priv)
4749 {
4750         struct rdma_dev_addr *dev_addr;
4751         struct cma_work *work;
4752
4753         dev_addr = &id_priv->id.route.addr.dev_addr;
4754
4755         if ((dev_addr->bound_dev_if == ndev->ifindex) &&
4756             (net_eq(dev_net(ndev), dev_addr->net)) &&
4757             memcmp(dev_addr->src_dev_addr, ndev->dev_addr, ndev->addr_len)) {
4758                 pr_info("RDMA CM addr change for ndev %s used by id %p\n",
4759                         ndev->name, &id_priv->id);
4760                 work = kzalloc(sizeof *work, GFP_KERNEL);
4761                 if (!work)
4762                         return -ENOMEM;
4763
4764                 INIT_WORK(&work->work, cma_work_handler);
4765                 work->id = id_priv;
4766                 work->event.event = RDMA_CM_EVENT_ADDR_CHANGE;
4767                 cma_id_get(id_priv);
4768                 queue_work(cma_wq, &work->work);
4769         }
4770
4771         return 0;
4772 }
4773
4774 static int cma_netdev_callback(struct notifier_block *self, unsigned long event,
4775                                void *ptr)
4776 {
4777         struct net_device *ndev = netdev_notifier_info_to_dev(ptr);
4778         struct cma_device *cma_dev;
4779         struct rdma_id_private *id_priv;
4780         int ret = NOTIFY_DONE;
4781
4782         if (event != NETDEV_BONDING_FAILOVER)
4783                 return NOTIFY_DONE;
4784
4785         if (!netif_is_bond_master(ndev))
4786                 return NOTIFY_DONE;
4787
4788         mutex_lock(&lock);
4789         list_for_each_entry(cma_dev, &dev_list, list)
4790                 list_for_each_entry(id_priv, &cma_dev->id_list, list) {
4791                         ret = cma_netdev_change(ndev, id_priv);
4792                         if (ret)
4793                                 goto out;
4794                 }
4795
4796 out:
4797         mutex_unlock(&lock);
4798         return ret;
4799 }
4800
4801 static struct notifier_block cma_nb = {
4802         .notifier_call = cma_netdev_callback
4803 };
4804
4805 static void cma_send_device_removal_put(struct rdma_id_private *id_priv)
4806 {
4807         struct rdma_cm_event event = { .event = RDMA_CM_EVENT_DEVICE_REMOVAL };
4808         enum rdma_cm_state state;
4809         unsigned long flags;
4810
4811         mutex_lock(&id_priv->handler_mutex);
4812         /* Record that we want to remove the device */
4813         spin_lock_irqsave(&id_priv->lock, flags);
4814         state = id_priv->state;
4815         if (state == RDMA_CM_DESTROYING || state == RDMA_CM_DEVICE_REMOVAL) {
4816                 spin_unlock_irqrestore(&id_priv->lock, flags);
4817                 mutex_unlock(&id_priv->handler_mutex);
4818                 cma_id_put(id_priv);
4819                 return;
4820         }
4821         id_priv->state = RDMA_CM_DEVICE_REMOVAL;
4822         spin_unlock_irqrestore(&id_priv->lock, flags);
4823
4824         if (cma_cm_event_handler(id_priv, &event)) {
4825                 /*
4826                  * At this point the ULP promises it won't call
4827                  * rdma_destroy_id() concurrently
4828                  */
4829                 cma_id_put(id_priv);
4830                 mutex_unlock(&id_priv->handler_mutex);
4831                 trace_cm_id_destroy(id_priv);
4832                 _destroy_id(id_priv, state);
4833                 return;
4834         }
4835         mutex_unlock(&id_priv->handler_mutex);
4836
4837         /*
4838          * If this races with destroy then the thread that first assigns state
4839          * to a destroying does the cancel.
4840          */
4841         cma_cancel_operation(id_priv, state);
4842         cma_id_put(id_priv);
4843 }
4844
4845 static void cma_process_remove(struct cma_device *cma_dev)
4846 {
4847         mutex_lock(&lock);
4848         while (!list_empty(&cma_dev->id_list)) {
4849                 struct rdma_id_private *id_priv = list_first_entry(
4850                         &cma_dev->id_list, struct rdma_id_private, list);
4851
4852                 list_del(&id_priv->listen_list);
4853                 list_del_init(&id_priv->list);
4854                 cma_id_get(id_priv);
4855                 mutex_unlock(&lock);
4856
4857                 cma_send_device_removal_put(id_priv);
4858
4859                 mutex_lock(&lock);
4860         }
4861         mutex_unlock(&lock);
4862
4863         cma_dev_put(cma_dev);
4864         wait_for_completion(&cma_dev->comp);
4865 }
4866
4867 static int cma_add_one(struct ib_device *device)
4868 {
4869         struct rdma_id_private *to_destroy;
4870         struct cma_device *cma_dev;
4871         struct rdma_id_private *id_priv;
4872         unsigned int i;
4873         unsigned long supported_gids = 0;
4874         int ret;
4875
4876         cma_dev = kmalloc(sizeof(*cma_dev), GFP_KERNEL);
4877         if (!cma_dev)
4878                 return -ENOMEM;
4879
4880         cma_dev->device = device;
4881         cma_dev->default_gid_type = kcalloc(device->phys_port_cnt,
4882                                             sizeof(*cma_dev->default_gid_type),
4883                                             GFP_KERNEL);
4884         if (!cma_dev->default_gid_type) {
4885                 ret = -ENOMEM;
4886                 goto free_cma_dev;
4887         }
4888
4889         cma_dev->default_roce_tos = kcalloc(device->phys_port_cnt,
4890                                             sizeof(*cma_dev->default_roce_tos),
4891                                             GFP_KERNEL);
4892         if (!cma_dev->default_roce_tos) {
4893                 ret = -ENOMEM;
4894                 goto free_gid_type;
4895         }
4896
4897         rdma_for_each_port (device, i) {
4898                 supported_gids = roce_gid_type_mask_support(device, i);
4899                 WARN_ON(!supported_gids);
4900                 if (supported_gids & (1 << CMA_PREFERRED_ROCE_GID_TYPE))
4901                         cma_dev->default_gid_type[i - rdma_start_port(device)] =
4902                                 CMA_PREFERRED_ROCE_GID_TYPE;
4903                 else
4904                         cma_dev->default_gid_type[i - rdma_start_port(device)] =
4905                                 find_first_bit(&supported_gids, BITS_PER_LONG);
4906                 cma_dev->default_roce_tos[i - rdma_start_port(device)] = 0;
4907         }
4908
4909         init_completion(&cma_dev->comp);
4910         refcount_set(&cma_dev->refcount, 1);
4911         INIT_LIST_HEAD(&cma_dev->id_list);
4912         ib_set_client_data(device, &cma_client, cma_dev);
4913
4914         mutex_lock(&lock);
4915         list_add_tail(&cma_dev->list, &dev_list);
4916         list_for_each_entry(id_priv, &listen_any_list, list) {
4917                 ret = cma_listen_on_dev(id_priv, cma_dev, &to_destroy);
4918                 if (ret)
4919                         goto free_listen;
4920         }
4921         mutex_unlock(&lock);
4922
4923         trace_cm_add_one(device);
4924         return 0;
4925
4926 free_listen:
4927         list_del(&cma_dev->list);
4928         mutex_unlock(&lock);
4929
4930         /* cma_process_remove() will delete to_destroy */
4931         cma_process_remove(cma_dev);
4932         kfree(cma_dev->default_roce_tos);
4933 free_gid_type:
4934         kfree(cma_dev->default_gid_type);
4935
4936 free_cma_dev:
4937         kfree(cma_dev);
4938         return ret;
4939 }
4940
4941 static void cma_remove_one(struct ib_device *device, void *client_data)
4942 {
4943         struct cma_device *cma_dev = client_data;
4944
4945         trace_cm_remove_one(device);
4946
4947         mutex_lock(&lock);
4948         list_del(&cma_dev->list);
4949         mutex_unlock(&lock);
4950
4951         cma_process_remove(cma_dev);
4952         kfree(cma_dev->default_roce_tos);
4953         kfree(cma_dev->default_gid_type);
4954         kfree(cma_dev);
4955 }
4956
4957 static int cma_init_net(struct net *net)
4958 {
4959         struct cma_pernet *pernet = cma_pernet(net);
4960
4961         xa_init(&pernet->tcp_ps);
4962         xa_init(&pernet->udp_ps);
4963         xa_init(&pernet->ipoib_ps);
4964         xa_init(&pernet->ib_ps);
4965
4966         return 0;
4967 }
4968
4969 static void cma_exit_net(struct net *net)
4970 {
4971         struct cma_pernet *pernet = cma_pernet(net);
4972
4973         WARN_ON(!xa_empty(&pernet->tcp_ps));
4974         WARN_ON(!xa_empty(&pernet->udp_ps));
4975         WARN_ON(!xa_empty(&pernet->ipoib_ps));
4976         WARN_ON(!xa_empty(&pernet->ib_ps));
4977 }
4978
4979 static struct pernet_operations cma_pernet_operations = {
4980         .init = cma_init_net,
4981         .exit = cma_exit_net,
4982         .id = &cma_pernet_id,
4983         .size = sizeof(struct cma_pernet),
4984 };
4985
4986 static int __init cma_init(void)
4987 {
4988         int ret;
4989
4990         /*
4991          * There is a rare lock ordering dependency in cma_netdev_callback()
4992          * that only happens when bonding is enabled. Teach lockdep that rtnl
4993          * must never be nested under lock so it can find these without having
4994          * to test with bonding.
4995          */
4996         if (IS_ENABLED(CONFIG_LOCKDEP)) {
4997                 rtnl_lock();
4998                 mutex_lock(&lock);
4999                 mutex_unlock(&lock);
5000                 rtnl_unlock();
5001         }
5002
5003         cma_wq = alloc_ordered_workqueue("rdma_cm", WQ_MEM_RECLAIM);
5004         if (!cma_wq)
5005                 return -ENOMEM;
5006
5007         ret = register_pernet_subsys(&cma_pernet_operations);
5008         if (ret)
5009                 goto err_wq;
5010
5011         ib_sa_register_client(&sa_client);
5012         register_netdevice_notifier(&cma_nb);
5013
5014         ret = ib_register_client(&cma_client);
5015         if (ret)
5016                 goto err;
5017
5018         ret = cma_configfs_init();
5019         if (ret)
5020                 goto err_ib;
5021
5022         return 0;
5023
5024 err_ib:
5025         ib_unregister_client(&cma_client);
5026 err:
5027         unregister_netdevice_notifier(&cma_nb);
5028         ib_sa_unregister_client(&sa_client);
5029         unregister_pernet_subsys(&cma_pernet_operations);
5030 err_wq:
5031         destroy_workqueue(cma_wq);
5032         return ret;
5033 }
5034
5035 static void __exit cma_cleanup(void)
5036 {
5037         cma_configfs_exit();
5038         ib_unregister_client(&cma_client);
5039         unregister_netdevice_notifier(&cma_nb);
5040         ib_sa_unregister_client(&sa_client);
5041         unregister_pernet_subsys(&cma_pernet_operations);
5042         destroy_workqueue(cma_wq);
5043 }
5044
5045 module_init(cma_init);
5046 module_exit(cma_cleanup);