drivers/infiniband/core/cma.c

   1 /*
   2  * Copyright (c) 2005 Voltaire Inc.  All rights reserved.
   3  * Copyright (c) 2002-2005, Network Appliance, Inc. All rights reserved.
   4  * Copyright (c) 1999-2005, Mellanox Technologies, Inc. All rights reserved.
   5  * Copyright (c) 2005-2006 Intel Corporation.  All rights reserved.
   6  *
   7  * This software is available to you under a choice of one of two
   8  * licenses.  You may choose to be licensed under the terms of the GNU
   9  * General Public License (GPL) Version 2, available from the file
  10  * COPYING in the main directory of this source tree, or the
  11  * OpenIB.org BSD license below:
  12  *
  13  *     Redistribution and use in source and binary forms, with or
  14  *     without modification, are permitted provided that the following
  15  *     conditions are met:
  16  *
  17  *      - Redistributions of source code must retain the above
  18  *        copyright notice, this list of conditions and the following
  19  *        disclaimer.
  20  *
  21  *      - Redistributions in binary form must reproduce the above
  22  *        copyright notice, this list of conditions and the following
  23  *        disclaimer in the documentation and/or other materials
  24  *        provided with the distribution.
  25  *
  26  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  27  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  28  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  29  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  30  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  31  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  32  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  33  * SOFTWARE.
  34  */
  35
  36 #include <linux/completion.h>
  37 #include <linux/in.h>
  38 #include <linux/in6.h>
  39 #include <linux/mutex.h>
  40 #include <linux/random.h>
  41 #include <linux/idr.h>
  42 #include <linux/inetdevice.h>
  43 #include <linux/slab.h>
  44
  45 #include <net/tcp.h>
  46 #include <net/ipv6.h>
  47
  48 #include <rdma/rdma_cm.h>
  49 #include <rdma/rdma_cm_ib.h>
  50 #include <rdma/ib_cache.h>
  51 #include <rdma/ib_cm.h>
  52 #include <rdma/ib_sa.h>
  53 #include <rdma/iw_cm.h>
  54
  55 MODULE_AUTHOR("Sean Hefty");
  56 MODULE_DESCRIPTION("Generic RDMA CM Agent");
  57 MODULE_LICENSE("Dual BSD/GPL");
  58
  59 #define CMA_CM_RESPONSE_TIMEOUT 20
  60 #define CMA_MAX_CM_RETRIES 15
  61 #define CMA_CM_MRA_SETTING (IB_CM_MRA_FLAG_DELAY | 24)
  62
  63 static void cma_add_one(struct ib_device *device);
  64 static void cma_remove_one(struct ib_device *device);
  65
  66 static struct ib_client cma_client = {
  67         .name   = "cma",
  68         .add    = cma_add_one,
  69         .remove = cma_remove_one
  70 };
  71
  72 static struct ib_sa_client sa_client;
  73 static struct rdma_addr_client addr_client;
  74 static LIST_HEAD(dev_list);
  75 static LIST_HEAD(listen_any_list);
  76 static DEFINE_MUTEX(lock);
  77 static struct workqueue_struct *cma_wq;
  78 static DEFINE_IDR(sdp_ps);
  79 static DEFINE_IDR(tcp_ps);
  80 static DEFINE_IDR(udp_ps);
  81 static DEFINE_IDR(ipoib_ps);
  82
  83 struct cma_device {
  84         struct list_head        list;
  85         struct ib_device        *device;
  86         struct completion       comp;
  87         atomic_t                refcount;
  88         struct list_head        id_list;
  89 };
  90
  91 enum cma_state {
  92         CMA_IDLE,
  93         CMA_ADDR_QUERY,
  94         CMA_ADDR_RESOLVED,
  95         CMA_ROUTE_QUERY,
  96         CMA_ROUTE_RESOLVED,
  97         CMA_CONNECT,
  98         CMA_DISCONNECT,
  99         CMA_ADDR_BOUND,
 100         CMA_LISTEN,
 101         CMA_DEVICE_REMOVAL,
 102         CMA_DESTROYING
 103 };
 104
 105 struct rdma_bind_list {
 106         struct idr              *ps;
 107         struct hlist_head       owners;
 108         unsigned short          port;
 109 };
 110
 111 /*
 112  * Device removal can occur at anytime, so we need extra handling to
 113  * serialize notifying the user of device removal with other callbacks.
 114  * We do this by disabling removal notification while a callback is in process,
 115  * and reporting it after the callback completes.
 116  */
 117 struct rdma_id_private {
 118         struct rdma_cm_id       id;
 119
 120         struct rdma_bind_list   *bind_list;
 121         struct hlist_node       node;
 122         struct list_head        list; /* listen_any_list or cma_device.list */
 123         struct list_head        listen_list; /* per device listens */
 124         struct cma_device       *cma_dev;
 125         struct list_head        mc_list;
 126
 127         int                     internal_id;
 128         enum cma_state          state;
 129         spinlock_t              lock;
 130         struct mutex            qp_mutex;
 131
 132         struct completion       comp;
 133         atomic_t                refcount;
 134         struct mutex            handler_mutex;
 135
 136         int                     backlog;
 137         int                     timeout_ms;
 138         struct ib_sa_query      *query;
 139         int                     query_id;
 140         union {
 141                 struct ib_cm_id *ib;
 142                 struct iw_cm_id *iw;
 143         } cm_id;
 144
 145         u32                     seq_num;
 146         u32                     qkey;
 147         u32                     qp_num;
 148         u8                      srq;
 149         u8                      tos;
 150 };
 151
 152 struct cma_multicast {
 153         struct rdma_id_private *id_priv;
 154         union {
 155                 struct ib_sa_multicast *ib;
 156         } multicast;
 157         struct list_head        list;
 158         void                    *context;
 159         struct sockaddr_storage addr;
 160 };
 161
 162 struct cma_work {
 163         struct work_struct      work;
 164         struct rdma_id_private  *id;
 165         enum cma_state          old_state;
 166         enum cma_state          new_state;
 167         struct rdma_cm_event    event;
 168 };
 169
 170 struct cma_ndev_work {
 171         struct work_struct      work;
 172         struct rdma_id_private  *id;
 173         struct rdma_cm_event    event;
 174 };
 175
 176 union cma_ip_addr {
 177         struct in6_addr ip6;
 178         struct {
 179                 __be32 pad[3];
 180                 __be32 addr;
 181         } ip4;
 182 };
 183
 184 struct cma_hdr {
 185         u8 cma_version;
 186         u8 ip_version;  /* IP version: 7:4 */
 187         __be16 port;
 188         union cma_ip_addr src_addr;
 189         union cma_ip_addr dst_addr;
 190 };
 191
 192 struct sdp_hh {
 193         u8 bsdh[16];
 194         u8 sdp_version; /* Major version: 7:4 */
 195         u8 ip_version;  /* IP version: 7:4 */
 196         u8 sdp_specific1[10];
 197         __be16 port;
 198         __be16 sdp_specific2;
 199         union cma_ip_addr src_addr;
 200         union cma_ip_addr dst_addr;
 201 };
 202
 203 struct sdp_hah {
 204         u8 bsdh[16];
 205         u8 sdp_version;
 206 };
 207
 208 #define CMA_VERSION 0x00
 209 #define SDP_MAJ_VERSION 0x2
 210
 211 static int cma_comp(struct rdma_id_private *id_priv, enum cma_state comp)
 212 {
 213         unsigned long flags;
 214         int ret;
 215
 216         spin_lock_irqsave(&id_priv->lock, flags);
 217         ret = (id_priv->state == comp);
 218         spin_unlock_irqrestore(&id_priv->lock, flags);
 219         return ret;
 220 }
 221
 222 static int cma_comp_exch(struct rdma_id_private *id_priv,
 223                          enum cma_state comp, enum cma_state exch)
 224 {
 225         unsigned long flags;
 226         int ret;
 227
 228         spin_lock_irqsave(&id_priv->lock, flags);
 229         if ((ret = (id_priv->state == comp)))
 230                 id_priv->state = exch;
 231         spin_unlock_irqrestore(&id_priv->lock, flags);
 232         return ret;
 233 }
 234
 235 static enum cma_state cma_exch(struct rdma_id_private *id_priv,
 236                                enum cma_state exch)
 237 {
 238         unsigned long flags;
 239         enum cma_state old;
 240
 241         spin_lock_irqsave(&id_priv->lock, flags);
 242         old = id_priv->state;
 243         id_priv->state = exch;
 244         spin_unlock_irqrestore(&id_priv->lock, flags);
 245         return old;
 246 }
 247
 248 static inline u8 cma_get_ip_ver(struct cma_hdr *hdr)
 249 {
 250         return hdr->ip_version >> 4;
 251 }
 252
 253 static inline void cma_set_ip_ver(struct cma_hdr *hdr, u8 ip_ver)
 254 {
 255         hdr->ip_version = (ip_ver << 4) | (hdr->ip_version & 0xF);
 256 }
 257
 258 static inline u8 sdp_get_majv(u8 sdp_version)
 259 {
 260         return sdp_version >> 4;
 261 }
 262
 263 static inline u8 sdp_get_ip_ver(struct sdp_hh *hh)
 264 {
 265         return hh->ip_version >> 4;
 266 }
 267
 268 static inline void sdp_set_ip_ver(struct sdp_hh *hh, u8 ip_ver)
 269 {
 270         hh->ip_version = (ip_ver << 4) | (hh->ip_version & 0xF);
 271 }
 272
 273 static inline int cma_is_ud_ps(enum rdma_port_space ps)
 274 {
 275         return (ps == RDMA_PS_UDP || ps == RDMA_PS_IPOIB);
 276 }
 277
 278 static void cma_attach_to_dev(struct rdma_id_private *id_priv,
 279                               struct cma_device *cma_dev)
 280 {
 281         atomic_inc(&cma_dev->refcount);
 282         id_priv->cma_dev = cma_dev;
 283         id_priv->id.device = cma_dev->device;
 284         list_add_tail(&id_priv->list, &cma_dev->id_list);
 285 }
 286
 287 static inline void cma_deref_dev(struct cma_device *cma_dev)
 288 {
 289         if (atomic_dec_and_test(&cma_dev->refcount))
 290                 complete(&cma_dev->comp);
 291 }
 292
 293 static void cma_detach_from_dev(struct rdma_id_private *id_priv)
 294 {
 295         list_del(&id_priv->list);
 296         cma_deref_dev(id_priv->cma_dev);
 297         id_priv->cma_dev = NULL;
 298 }
 299
 300 static int cma_set_qkey(struct rdma_id_private *id_priv)
 301 {
 302         struct ib_sa_mcmember_rec rec;
 303         int ret = 0;
 304
 305         if (id_priv->qkey)
 306                 return 0;
 307
 308         switch (id_priv->id.ps) {
 309         case RDMA_PS_UDP:
 310                 id_priv->qkey = RDMA_UDP_QKEY;
 311                 break;
 312         case RDMA_PS_IPOIB:
 313                 ib_addr_get_mgid(&id_priv->id.route.addr.dev_addr, &rec.mgid);
 314                 ret = ib_sa_get_mcmember_rec(id_priv->id.device,
 315                                              id_priv->id.port_num, &rec.mgid,
 316                                              &rec);
 317                 if (!ret)
 318                         id_priv->qkey = be32_to_cpu(rec.qkey);
 319                 break;
 320         default:
 321                 break;
 322         }
 323         return ret;
 324 }
 325
 326 static int cma_acquire_dev(struct rdma_id_private *id_priv)
 327 {
 328         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
 329         struct cma_device *cma_dev;
 330         union ib_gid gid;
 331         int ret = -ENODEV;
 332
 333         rdma_addr_get_sgid(dev_addr, &gid);
 334         list_for_each_entry(cma_dev, &dev_list, list) {
 335                 ret = ib_find_cached_gid(cma_dev->device, &gid,
 336                                          &id_priv->id.port_num, NULL);
 337                 if (!ret) {
 338                         cma_attach_to_dev(id_priv, cma_dev);
 339                         break;
 340                 }
 341         }
 342         return ret;
 343 }
 344
 345 static void cma_deref_id(struct rdma_id_private *id_priv)
 346 {
 347         if (atomic_dec_and_test(&id_priv->refcount))
 348                 complete(&id_priv->comp);
 349 }
 350
 351 static int cma_disable_callback(struct rdma_id_private *id_priv,
 352                               enum cma_state state)
 353 {
 354         mutex_lock(&id_priv->handler_mutex);
 355         if (id_priv->state != state) {
 356                 mutex_unlock(&id_priv->handler_mutex);
 357                 return -EINVAL;
 358         }
 359         return 0;
 360 }
 361
 362 static int cma_has_cm_dev(struct rdma_id_private *id_priv)
 363 {
 364         return (id_priv->id.device && id_priv->cm_id.ib);
 365 }
 366
 367 struct rdma_cm_id *rdma_create_id(rdma_cm_event_handler event_handler,
 368                                   void *context, enum rdma_port_space ps)
 369 {
 370         struct rdma_id_private *id_priv;
 371
 372         id_priv = kzalloc(sizeof *id_priv, GFP_KERNEL);
 373         if (!id_priv)
 374                 return ERR_PTR(-ENOMEM);
 375
 376         id_priv->state = CMA_IDLE;
 377         id_priv->id.context = context;
 378         id_priv->id.event_handler = event_handler;
 379         id_priv->id.ps = ps;
 380         spin_lock_init(&id_priv->lock);
 381         mutex_init(&id_priv->qp_mutex);
 382         init_completion(&id_priv->comp);
 383         atomic_set(&id_priv->refcount, 1);
 384         mutex_init(&id_priv->handler_mutex);
 385         INIT_LIST_HEAD(&id_priv->listen_list);
 386         INIT_LIST_HEAD(&id_priv->mc_list);
 387         get_random_bytes(&id_priv->seq_num, sizeof id_priv->seq_num);
 388
 389         return &id_priv->id;
 390 }
 391 EXPORT_SYMBOL(rdma_create_id);
 392
 393 static int cma_init_ud_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
 394 {
 395         struct ib_qp_attr qp_attr;
 396         int qp_attr_mask, ret;
 397
 398         qp_attr.qp_state = IB_QPS_INIT;
 399         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 400         if (ret)
 401                 return ret;
 402
 403         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 404         if (ret)
 405                 return ret;
 406
 407         qp_attr.qp_state = IB_QPS_RTR;
 408         ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
 409         if (ret)
 410                 return ret;
 411
 412         qp_attr.qp_state = IB_QPS_RTS;
 413         qp_attr.sq_psn = 0;
 414         ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE | IB_QP_SQ_PSN);
 415
 416         return ret;
 417 }
 418
 419 static int cma_init_conn_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
 420 {
 421         struct ib_qp_attr qp_attr;
 422         int qp_attr_mask, ret;
 423
 424         qp_attr.qp_state = IB_QPS_INIT;
 425         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 426         if (ret)
 427                 return ret;
 428
 429         return ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 430 }
 431
 432 int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
 433                    struct ib_qp_init_attr *qp_init_attr)
 434 {
 435         struct rdma_id_private *id_priv;
 436         struct ib_qp *qp;
 437         int ret;
 438
 439         id_priv = container_of(id, struct rdma_id_private, id);
 440         if (id->device != pd->device)
 441                 return -EINVAL;
 442
 443         qp = ib_create_qp(pd, qp_init_attr);
 444         if (IS_ERR(qp))
 445                 return PTR_ERR(qp);
 446
 447         if (cma_is_ud_ps(id_priv->id.ps))
 448                 ret = cma_init_ud_qp(id_priv, qp);
 449         else
 450                 ret = cma_init_conn_qp(id_priv, qp);
 451         if (ret)
 452                 goto err;
 453
 454         id->qp = qp;
 455         id_priv->qp_num = qp->qp_num;
 456         id_priv->srq = (qp->srq != NULL);
 457         return 0;
 458 err:
 459         ib_destroy_qp(qp);
 460         return ret;
 461 }
 462 EXPORT_SYMBOL(rdma_create_qp);
 463
 464 void rdma_destroy_qp(struct rdma_cm_id *id)
 465 {
 466         struct rdma_id_private *id_priv;
 467
 468         id_priv = container_of(id, struct rdma_id_private, id);
 469         mutex_lock(&id_priv->qp_mutex);
 470         ib_destroy_qp(id_priv->id.qp);
 471         id_priv->id.qp = NULL;
 472         mutex_unlock(&id_priv->qp_mutex);
 473 }
 474 EXPORT_SYMBOL(rdma_destroy_qp);
 475
 476 static int cma_modify_qp_rtr(struct rdma_id_private *id_priv,
 477                              struct rdma_conn_param *conn_param)
 478 {
 479         struct ib_qp_attr qp_attr;
 480         int qp_attr_mask, ret;
 481
 482         mutex_lock(&id_priv->qp_mutex);
 483         if (!id_priv->id.qp) {
 484                 ret = 0;
 485                 goto out;
 486         }
 487
 488         /* Need to update QP attributes from default values. */
 489         qp_attr.qp_state = IB_QPS_INIT;
 490         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 491         if (ret)
 492                 goto out;
 493
 494         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
 495         if (ret)
 496                 goto out;
 497
 498         qp_attr.qp_state = IB_QPS_RTR;
 499         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 500         if (ret)
 501                 goto out;
 502
 503         if (conn_param)
 504                 qp_attr.max_dest_rd_atomic = conn_param->responder_resources;
 505         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
 506 out:
 507         mutex_unlock(&id_priv->qp_mutex);
 508         return ret;
 509 }
 510
 511 static int cma_modify_qp_rts(struct rdma_id_private *id_priv,
 512                              struct rdma_conn_param *conn_param)
 513 {
 514         struct ib_qp_attr qp_attr;
 515         int qp_attr_mask, ret;
 516
 517         mutex_lock(&id_priv->qp_mutex);
 518         if (!id_priv->id.qp) {
 519                 ret = 0;
 520                 goto out;
 521         }
 522
 523         qp_attr.qp_state = IB_QPS_RTS;
 524         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 525         if (ret)
 526                 goto out;
 527
 528         if (conn_param)
 529                 qp_attr.max_rd_atomic = conn_param->initiator_depth;
 530         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
 531 out:
 532         mutex_unlock(&id_priv->qp_mutex);
 533         return ret;
 534 }
 535
 536 static int cma_modify_qp_err(struct rdma_id_private *id_priv)
 537 {
 538         struct ib_qp_attr qp_attr;
 539         int ret;
 540
 541         mutex_lock(&id_priv->qp_mutex);
 542         if (!id_priv->id.qp) {
 543                 ret = 0;
 544                 goto out;
 545         }
 546
 547         qp_attr.qp_state = IB_QPS_ERR;
 548         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, IB_QP_STATE);
 549 out:
 550         mutex_unlock(&id_priv->qp_mutex);
 551         return ret;
 552 }
 553
 554 static int cma_ib_init_qp_attr(struct rdma_id_private *id_priv,
 555                                struct ib_qp_attr *qp_attr, int *qp_attr_mask)
 556 {
 557         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
 558         int ret;
 559
 560         ret = ib_find_cached_pkey(id_priv->id.device, id_priv->id.port_num,
 561                                   ib_addr_get_pkey(dev_addr),
 562                                   &qp_attr->pkey_index);
 563         if (ret)
 564                 return ret;
 565
 566         qp_attr->port_num = id_priv->id.port_num;
 567         *qp_attr_mask = IB_QP_STATE | IB_QP_PKEY_INDEX | IB_QP_PORT;
 568
 569         if (cma_is_ud_ps(id_priv->id.ps)) {
 570                 ret = cma_set_qkey(id_priv);
 571                 if (ret)
 572                         return ret;
 573
 574                 qp_attr->qkey = id_priv->qkey;
 575                 *qp_attr_mask |= IB_QP_QKEY;
 576         } else {
 577                 qp_attr->qp_access_flags = 0;
 578                 *qp_attr_mask |= IB_QP_ACCESS_FLAGS;
 579         }
 580         return 0;
 581 }
 582
 583 int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
 584                        int *qp_attr_mask)
 585 {
 586         struct rdma_id_private *id_priv;
 587         int ret = 0;
 588
 589         id_priv = container_of(id, struct rdma_id_private, id);
 590         switch (rdma_node_get_transport(id_priv->id.device->node_type)) {
 591         case RDMA_TRANSPORT_IB:
 592                 if (!id_priv->cm_id.ib || cma_is_ud_ps(id_priv->id.ps))
 593                         ret = cma_ib_init_qp_attr(id_priv, qp_attr, qp_attr_mask);
 594                 else
 595                         ret = ib_cm_init_qp_attr(id_priv->cm_id.ib, qp_attr,
 596                                                  qp_attr_mask);
 597                 if (qp_attr->qp_state == IB_QPS_RTR)
 598                         qp_attr->rq_psn = id_priv->seq_num;
 599                 break;
 600         case RDMA_TRANSPORT_IWARP:
 601                 if (!id_priv->cm_id.iw) {
 602                         qp_attr->qp_access_flags = 0;
 603                         *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS;
 604                 } else
 605                         ret = iw_cm_init_qp_attr(id_priv->cm_id.iw, qp_attr,
 606                                                  qp_attr_mask);
 607                 break;
 608         default:
 609                 ret = -ENOSYS;
 610                 break;
 611         }
 612
 613         return ret;
 614 }
 615 EXPORT_SYMBOL(rdma_init_qp_attr);
 616
 617 static inline int cma_zero_addr(struct sockaddr *addr)
 618 {
 619         struct in6_addr *ip6;
 620
 621         if (addr->sa_family == AF_INET)
 622                 return ipv4_is_zeronet(
 623                         ((struct sockaddr_in *)addr)->sin_addr.s_addr);
 624         else {
 625                 ip6 = &((struct sockaddr_in6 *) addr)->sin6_addr;
 626                 return (ip6->s6_addr32[0] | ip6->s6_addr32[1] |
 627                         ip6->s6_addr32[2] | ip6->s6_addr32[3]) == 0;
 628         }
 629 }
 630
 631 static inline int cma_loopback_addr(struct sockaddr *addr)
 632 {
 633         if (addr->sa_family == AF_INET)
 634                 return ipv4_is_loopback(
 635                         ((struct sockaddr_in *) addr)->sin_addr.s_addr);
 636         else
 637                 return ipv6_addr_loopback(
 638                         &((struct sockaddr_in6 *) addr)->sin6_addr);
 639 }
 640
 641 static inline int cma_any_addr(struct sockaddr *addr)
 642 {
 643         return cma_zero_addr(addr) || cma_loopback_addr(addr);
 644 }
 645
 646 static inline __be16 cma_port(struct sockaddr *addr)
 647 {
 648         if (addr->sa_family == AF_INET)
 649                 return ((struct sockaddr_in *) addr)->sin_port;
 650         else
 651                 return ((struct sockaddr_in6 *) addr)->sin6_port;
 652 }
 653
 654 static inline int cma_any_port(struct sockaddr *addr)
 655 {
 656         return !cma_port(addr);
 657 }
 658
 659 static int cma_get_net_info(void *hdr, enum rdma_port_space ps,
 660                             u8 *ip_ver, __be16 *port,
 661                             union cma_ip_addr **src, union cma_ip_addr **dst)
 662 {
 663         switch (ps) {
 664         case RDMA_PS_SDP:
 665                 if (sdp_get_majv(((struct sdp_hh *) hdr)->sdp_version) !=
 666                     SDP_MAJ_VERSION)
 667                         return -EINVAL;
 668
 669                 *ip_ver = sdp_get_ip_ver(hdr);
 670                 *port   = ((struct sdp_hh *) hdr)->port;
 671                 *src    = &((struct sdp_hh *) hdr)->src_addr;
 672                 *dst    = &((struct sdp_hh *) hdr)->dst_addr;
 673                 break;
 674         default:
 675                 if (((struct cma_hdr *) hdr)->cma_version != CMA_VERSION)
 676                         return -EINVAL;
 677
 678                 *ip_ver = cma_get_ip_ver(hdr);
 679                 *port   = ((struct cma_hdr *) hdr)->port;
 680                 *src    = &((struct cma_hdr *) hdr)->src_addr;
 681                 *dst    = &((struct cma_hdr *) hdr)->dst_addr;
 682                 break;
 683         }
 684
 685         if (*ip_ver != 4 && *ip_ver != 6)
 686                 return -EINVAL;
 687         return 0;
 688 }
 689
 690 static void cma_save_net_info(struct rdma_addr *addr,
 691                               struct rdma_addr *listen_addr,
 692                               u8 ip_ver, __be16 port,
 693                               union cma_ip_addr *src, union cma_ip_addr *dst)
 694 {
 695         struct sockaddr_in *listen4, *ip4;
 696         struct sockaddr_in6 *listen6, *ip6;
 697
 698         switch (ip_ver) {
 699         case 4:
 700                 listen4 = (struct sockaddr_in *) &listen_addr->src_addr;
 701                 ip4 = (struct sockaddr_in *) &addr->src_addr;
 702                 ip4->sin_family = listen4->sin_family;
 703                 ip4->sin_addr.s_addr = dst->ip4.addr;
 704                 ip4->sin_port = listen4->sin_port;
 705
 706                 ip4 = (struct sockaddr_in *) &addr->dst_addr;
 707                 ip4->sin_family = listen4->sin_family;
 708                 ip4->sin_addr.s_addr = src->ip4.addr;
 709                 ip4->sin_port = port;
 710                 break;
 711         case 6:
 712                 listen6 = (struct sockaddr_in6 *) &listen_addr->src_addr;
 713                 ip6 = (struct sockaddr_in6 *) &addr->src_addr;
 714                 ip6->sin6_family = listen6->sin6_family;
 715                 ip6->sin6_addr = dst->ip6;
 716                 ip6->sin6_port = listen6->sin6_port;
 717
 718                 ip6 = (struct sockaddr_in6 *) &addr->dst_addr;
 719                 ip6->sin6_family = listen6->sin6_family;
 720                 ip6->sin6_addr = src->ip6;
 721                 ip6->sin6_port = port;
 722                 break;
 723         default:
 724                 break;
 725         }
 726 }
 727
 728 static inline int cma_user_data_offset(enum rdma_port_space ps)
 729 {
 730         switch (ps) {
 731         case RDMA_PS_SDP:
 732                 return 0;
 733         default:
 734                 return sizeof(struct cma_hdr);
 735         }
 736 }
 737
 738 static void cma_cancel_route(struct rdma_id_private *id_priv)
 739 {
 740         switch (rdma_node_get_transport(id_priv->id.device->node_type)) {
 741         case RDMA_TRANSPORT_IB:
 742                 if (id_priv->query)
 743                         ib_sa_cancel_query(id_priv->query_id, id_priv->query);
 744                 break;
 745         default:
 746                 break;
 747         }
 748 }
 749
 750 static void cma_cancel_listens(struct rdma_id_private *id_priv)
 751 {
 752         struct rdma_id_private *dev_id_priv;
 753
 754         /*
 755          * Remove from listen_any_list to prevent added devices from spawning
 756          * additional listen requests.
 757          */
 758         mutex_lock(&lock);
 759         list_del(&id_priv->list);
 760
 761         while (!list_empty(&id_priv->listen_list)) {
 762                 dev_id_priv = list_entry(id_priv->listen_list.next,
 763                                          struct rdma_id_private, listen_list);
 764                 /* sync with device removal to avoid duplicate destruction */
 765                 list_del_init(&dev_id_priv->list);
 766                 list_del(&dev_id_priv->listen_list);
 767                 mutex_unlock(&lock);
 768
 769                 rdma_destroy_id(&dev_id_priv->id);
 770                 mutex_lock(&lock);
 771         }
 772         mutex_unlock(&lock);
 773 }
 774
 775 static void cma_cancel_operation(struct rdma_id_private *id_priv,
 776                                  enum cma_state state)
 777 {
 778         switch (state) {
 779         case CMA_ADDR_QUERY:
 780                 rdma_addr_cancel(&id_priv->id.route.addr.dev_addr);
 781                 break;
 782         case CMA_ROUTE_QUERY:
 783                 cma_cancel_route(id_priv);
 784                 break;
 785         case CMA_LISTEN:
 786                 if (cma_any_addr((struct sockaddr *) &id_priv->id.route.addr.src_addr)
 787                                 && !id_priv->cma_dev)
 788                         cma_cancel_listens(id_priv);
 789                 break;
 790         default:
 791                 break;
 792         }
 793 }
 794
 795 static void cma_release_port(struct rdma_id_private *id_priv)
 796 {
 797         struct rdma_bind_list *bind_list = id_priv->bind_list;
 798
 799         if (!bind_list)
 800                 return;
 801
 802         mutex_lock(&lock);
 803         hlist_del(&id_priv->node);
 804         if (hlist_empty(&bind_list->owners)) {
 805                 idr_remove(bind_list->ps, bind_list->port);
 806                 kfree(bind_list);
 807         }
 808         mutex_unlock(&lock);
 809 }
 810
 811 static void cma_leave_mc_groups(struct rdma_id_private *id_priv)
 812 {
 813         struct cma_multicast *mc;
 814
 815         while (!list_empty(&id_priv->mc_list)) {
 816                 mc = container_of(id_priv->mc_list.next,
 817                                   struct cma_multicast, list);
 818                 list_del(&mc->list);
 819                 ib_sa_free_multicast(mc->multicast.ib);
 820                 kfree(mc);
 821         }
 822 }
 823
 824 void rdma_destroy_id(struct rdma_cm_id *id)
 825 {
 826         struct rdma_id_private *id_priv;
 827         enum cma_state state;
 828
 829         id_priv = container_of(id, struct rdma_id_private, id);
 830         state = cma_exch(id_priv, CMA_DESTROYING);
 831         cma_cancel_operation(id_priv, state);
 832
 833         mutex_lock(&lock);
 834         if (id_priv->cma_dev) {
 835                 mutex_unlock(&lock);
 836                 switch (rdma_node_get_transport(id->device->node_type)) {
 837                 case RDMA_TRANSPORT_IB:
 838                         if (id_priv->cm_id.ib && !IS_ERR(id_priv->cm_id.ib))
 839                                 ib_destroy_cm_id(id_priv->cm_id.ib);
 840                         break;
 841                 case RDMA_TRANSPORT_IWARP:
 842                         if (id_priv->cm_id.iw && !IS_ERR(id_priv->cm_id.iw))
 843                                 iw_destroy_cm_id(id_priv->cm_id.iw);
 844                         break;
 845                 default:
 846                         break;
 847                 }
 848                 cma_leave_mc_groups(id_priv);
 849                 mutex_lock(&lock);
 850                 cma_detach_from_dev(id_priv);
 851         }
 852         mutex_unlock(&lock);
 853
 854         cma_release_port(id_priv);
 855         cma_deref_id(id_priv);
 856         wait_for_completion(&id_priv->comp);
 857
 858         if (id_priv->internal_id)
 859                 cma_deref_id(id_priv->id.context);
 860
 861         kfree(id_priv->id.route.path_rec);
 862         kfree(id_priv);
 863 }
 864 EXPORT_SYMBOL(rdma_destroy_id);
 865
 866 static int cma_rep_recv(struct rdma_id_private *id_priv)
 867 {
 868         int ret;
 869
 870         ret = cma_modify_qp_rtr(id_priv, NULL);
 871         if (ret)
 872                 goto reject;
 873
 874         ret = cma_modify_qp_rts(id_priv, NULL);
 875         if (ret)
 876                 goto reject;
 877
 878         ret = ib_send_cm_rtu(id_priv->cm_id.ib, NULL, 0);
 879         if (ret)
 880                 goto reject;
 881
 882         return 0;
 883 reject:
 884         cma_modify_qp_err(id_priv);
 885         ib_send_cm_rej(id_priv->cm_id.ib, IB_CM_REJ_CONSUMER_DEFINED,
 886                        NULL, 0, NULL, 0);
 887         return ret;
 888 }
 889
 890 static int cma_verify_rep(struct rdma_id_private *id_priv, void *data)
 891 {
 892         if (id_priv->id.ps == RDMA_PS_SDP &&
 893             sdp_get_majv(((struct sdp_hah *) data)->sdp_version) !=
 894             SDP_MAJ_VERSION)
 895                 return -EINVAL;
 896
 897         return 0;
 898 }
 899
 900 static void cma_set_rep_event_data(struct rdma_cm_event *event,
 901                                    struct ib_cm_rep_event_param *rep_data,
 902                                    void *private_data)
 903 {
 904         event->param.conn.private_data = private_data;
 905         event->param.conn.private_data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
 906         event->param.conn.responder_resources = rep_data->responder_resources;
 907         event->param.conn.initiator_depth = rep_data->initiator_depth;
 908         event->param.conn.flow_control = rep_data->flow_control;
 909         event->param.conn.rnr_retry_count = rep_data->rnr_retry_count;
 910         event->param.conn.srq = rep_data->srq;
 911         event->param.conn.qp_num = rep_data->remote_qpn;
 912 }
 913
 914 static int cma_ib_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
 915 {
 916         struct rdma_id_private *id_priv = cm_id->context;
 917         struct rdma_cm_event event;
 918         int ret = 0;
 919
 920         if ((ib_event->event != IB_CM_TIMEWAIT_EXIT &&
 921                 cma_disable_callback(id_priv, CMA_CONNECT)) ||
 922             (ib_event->event == IB_CM_TIMEWAIT_EXIT &&
 923                 cma_disable_callback(id_priv, CMA_DISCONNECT)))
 924                 return 0;
 925
 926         memset(&event, 0, sizeof event);
 927         switch (ib_event->event) {
 928         case IB_CM_REQ_ERROR:
 929         case IB_CM_REP_ERROR:
 930                 event.event = RDMA_CM_EVENT_UNREACHABLE;
 931                 event.status = -ETIMEDOUT;
 932                 break;
 933         case IB_CM_REP_RECEIVED:
 934                 event.status = cma_verify_rep(id_priv, ib_event->private_data);
 935                 if (event.status)
 936                         event.event = RDMA_CM_EVENT_CONNECT_ERROR;
 937                 else if (id_priv->id.qp && id_priv->id.ps != RDMA_PS_SDP) {
 938                         event.status = cma_rep_recv(id_priv);
 939                         event.event = event.status ? RDMA_CM_EVENT_CONNECT_ERROR :
 940                                                      RDMA_CM_EVENT_ESTABLISHED;
 941                 } else
 942                         event.event = RDMA_CM_EVENT_CONNECT_RESPONSE;
 943                 cma_set_rep_event_data(&event, &ib_event->param.rep_rcvd,
 944                                        ib_event->private_data);
 945                 break;
 946         case IB_CM_RTU_RECEIVED:
 947         case IB_CM_USER_ESTABLISHED:
 948                 event.event = RDMA_CM_EVENT_ESTABLISHED;
 949                 break;
 950         case IB_CM_DREQ_ERROR:
 951                 event.status = -ETIMEDOUT; /* fall through */
 952         case IB_CM_DREQ_RECEIVED:
 953         case IB_CM_DREP_RECEIVED:
 954                 if (!cma_comp_exch(id_priv, CMA_CONNECT, CMA_DISCONNECT))
 955                         goto out;
 956                 event.event = RDMA_CM_EVENT_DISCONNECTED;
 957                 break;
 958         case IB_CM_TIMEWAIT_EXIT:
 959                 event.event = RDMA_CM_EVENT_TIMEWAIT_EXIT;
 960                 break;
 961         case IB_CM_MRA_RECEIVED:
 962                 /* ignore event */
 963                 goto out;
 964         case IB_CM_REJ_RECEIVED:
 965                 cma_modify_qp_err(id_priv);
 966                 event.status = ib_event->param.rej_rcvd.reason;
 967                 event.event = RDMA_CM_EVENT_REJECTED;
 968                 event.param.conn.private_data = ib_event->private_data;
 969                 event.param.conn.private_data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
 970                 break;
 971         default:
 972                 printk(KERN_ERR "RDMA CMA: unexpected IB CM event: %d\n",
 973                        ib_event->event);
 974                 goto out;
 975         }
 976
 977         ret = id_priv->id.event_handler(&id_priv->id, &event);
 978         if (ret) {
 979                 /* Destroy the CM ID by returning a non-zero value. */
 980                 id_priv->cm_id.ib = NULL;
 981                 cma_exch(id_priv, CMA_DESTROYING);
 982                 mutex_unlock(&id_priv->handler_mutex);
 983                 rdma_destroy_id(&id_priv->id);
 984                 return ret;
 985         }
 986 out:
 987         mutex_unlock(&id_priv->handler_mutex);
 988         return ret;
 989 }
 990
 991 static struct rdma_id_private *cma_new_conn_id(struct rdma_cm_id *listen_id,
 992                                                struct ib_cm_event *ib_event)
 993 {
 994         struct rdma_id_private *id_priv;
 995         struct rdma_cm_id *id;
 996         struct rdma_route *rt;
 997         union cma_ip_addr *src, *dst;
 998         __be16 port;
 999         u8 ip_ver;
1000         int ret;
1001
1002         if (cma_get_net_info(ib_event->private_data, listen_id->ps,
1003                              &ip_ver, &port, &src, &dst))
1004                 goto err;
1005
1006         id = rdma_create_id(listen_id->event_handler, listen_id->context,
1007                             listen_id->ps);
1008         if (IS_ERR(id))
1009                 goto err;
1010
1011         cma_save_net_info(&id->route.addr, &listen_id->route.addr,
1012                           ip_ver, port, src, dst);
1013
1014         rt = &id->route;
1015         rt->num_paths = ib_event->param.req_rcvd.alternate_path ? 2 : 1;
1016         rt->path_rec = kmalloc(sizeof *rt->path_rec * rt->num_paths,
1017                                GFP_KERNEL);
1018         if (!rt->path_rec)
1019                 goto destroy_id;
1020
1021         rt->path_rec[0] = *ib_event->param.req_rcvd.primary_path;
1022         if (rt->num_paths == 2)
1023                 rt->path_rec[1] = *ib_event->param.req_rcvd.alternate_path;
1024
1025         if (cma_any_addr((struct sockaddr *) &rt->addr.src_addr)) {
1026                 rt->addr.dev_addr.dev_type = ARPHRD_INFINIBAND;
1027                 rdma_addr_set_sgid(&rt->addr.dev_addr, &rt->path_rec[0].sgid);
1028                 ib_addr_set_pkey(&rt->addr.dev_addr, rt->path_rec[0].pkey);
1029         } else {
1030                 ret = rdma_translate_ip((struct sockaddr *) &rt->addr.src_addr,
1031                                         &rt->addr.dev_addr);
1032                 if (ret)
1033                         goto destroy_id;
1034         }
1035         rdma_addr_set_dgid(&rt->addr.dev_addr, &rt->path_rec[0].dgid);
1036
1037         id_priv = container_of(id, struct rdma_id_private, id);
1038         id_priv->state = CMA_CONNECT;
1039         return id_priv;
1040
1041 destroy_id:
1042         rdma_destroy_id(id);
1043 err:
1044         return NULL;
1045 }
1046
1047 static struct rdma_id_private *cma_new_udp_id(struct rdma_cm_id *listen_id,
1048                                               struct ib_cm_event *ib_event)
1049 {
1050         struct rdma_id_private *id_priv;
1051         struct rdma_cm_id *id;
1052         union cma_ip_addr *src, *dst;
1053         __be16 port;
1054         u8 ip_ver;
1055         int ret;
1056
1057         id = rdma_create_id(listen_id->event_handler, listen_id->context,
1058                             listen_id->ps);
1059         if (IS_ERR(id))
1060                 return NULL;
1061
1062
1063         if (cma_get_net_info(ib_event->private_data, listen_id->ps,
1064                              &ip_ver, &port, &src, &dst))
1065                 goto err;
1066
1067         cma_save_net_info(&id->route.addr, &listen_id->route.addr,
1068                           ip_ver, port, src, dst);
1069
1070         if (!cma_any_addr((struct sockaddr *) &id->route.addr.src_addr)) {
1071                 ret = rdma_translate_ip((struct sockaddr *) &id->route.addr.src_addr,
1072                                         &id->route.addr.dev_addr);
1073                 if (ret)
1074                         goto err;
1075         }
1076
1077         id_priv = container_of(id, struct rdma_id_private, id);
1078         id_priv->state = CMA_CONNECT;
1079         return id_priv;
1080 err:
1081         rdma_destroy_id(id);
1082         return NULL;
1083 }
1084
1085 static void cma_set_req_event_data(struct rdma_cm_event *event,
1086                                    struct ib_cm_req_event_param *req_data,
1087                                    void *private_data, int offset)
1088 {
1089         event->param.conn.private_data = private_data + offset;
1090         event->param.conn.private_data_len = IB_CM_REQ_PRIVATE_DATA_SIZE - offset;
1091         event->param.conn.responder_resources = req_data->responder_resources;
1092         event->param.conn.initiator_depth = req_data->initiator_depth;
1093         event->param.conn.flow_control = req_data->flow_control;
1094         event->param.conn.retry_count = req_data->retry_count;
1095         event->param.conn.rnr_retry_count = req_data->rnr_retry_count;
1096         event->param.conn.srq = req_data->srq;
1097         event->param.conn.qp_num = req_data->remote_qpn;
1098 }
1099
1100 static int cma_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
1101 {
1102         struct rdma_id_private *listen_id, *conn_id;
1103         struct rdma_cm_event event;
1104         int offset, ret;
1105
1106         listen_id = cm_id->context;
1107         if (cma_disable_callback(listen_id, CMA_LISTEN))
1108                 return -ECONNABORTED;
1109
1110         memset(&event, 0, sizeof event);
1111         offset = cma_user_data_offset(listen_id->id.ps);
1112         event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
1113         if (cma_is_ud_ps(listen_id->id.ps)) {
1114                 conn_id = cma_new_udp_id(&listen_id->id, ib_event);
1115                 event.param.ud.private_data = ib_event->private_data + offset;
1116                 event.param.ud.private_data_len =
1117                                 IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE - offset;
1118         } else {
1119                 conn_id = cma_new_conn_id(&listen_id->id, ib_event);
1120                 cma_set_req_event_data(&event, &ib_event->param.req_rcvd,
1121                                        ib_event->private_data, offset);
1122         }
1123         if (!conn_id) {
1124                 ret = -ENOMEM;
1125                 goto out;
1126         }
1127
1128         mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
1129         mutex_lock(&lock);
1130         ret = cma_acquire_dev(conn_id);
1131         mutex_unlock(&lock);
1132         if (ret)
1133                 goto release_conn_id;
1134
1135         conn_id->cm_id.ib = cm_id;
1136         cm_id->context = conn_id;
1137         cm_id->cm_handler = cma_ib_handler;
1138
1139         ret = conn_id->id.event_handler(&conn_id->id, &event);
1140         if (!ret) {
1141                 /*
1142                  * Acquire mutex to prevent user executing rdma_destroy_id()
1143                  * while we're accessing the cm_id.
1144                  */
1145                 mutex_lock(&lock);
1146                 if (cma_comp(conn_id, CMA_CONNECT) &&
1147                     !cma_is_ud_ps(conn_id->id.ps))
1148                         ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
1149                 mutex_unlock(&lock);
1150                 mutex_unlock(&conn_id->handler_mutex);
1151                 goto out;
1152         }
1153
1154         /* Destroy the CM ID by returning a non-zero value. */
1155         conn_id->cm_id.ib = NULL;
1156
1157 release_conn_id:
1158         cma_exch(conn_id, CMA_DESTROYING);
1159         mutex_unlock(&conn_id->handler_mutex);
1160         rdma_destroy_id(&conn_id->id);
1161
1162 out:
1163         mutex_unlock(&listen_id->handler_mutex);
1164         return ret;
1165 }
1166
1167 static __be64 cma_get_service_id(enum rdma_port_space ps, struct sockaddr *addr)
1168 {
1169         return cpu_to_be64(((u64)ps << 16) + be16_to_cpu(cma_port(addr)));
1170 }
1171
1172 static void cma_set_compare_data(enum rdma_port_space ps, struct sockaddr *addr,
1173                                  struct ib_cm_compare_data *compare)
1174 {
1175         struct cma_hdr *cma_data, *cma_mask;
1176         struct sdp_hh *sdp_data, *sdp_mask;
1177         __be32 ip4_addr;
1178         struct in6_addr ip6_addr;
1179
1180         memset(compare, 0, sizeof *compare);
1181         cma_data = (void *) compare->data;
1182         cma_mask = (void *) compare->mask;
1183         sdp_data = (void *) compare->data;
1184         sdp_mask = (void *) compare->mask;
1185
1186         switch (addr->sa_family) {
1187         case AF_INET:
1188                 ip4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
1189                 if (ps == RDMA_PS_SDP) {
1190                         sdp_set_ip_ver(sdp_data, 4);
1191                         sdp_set_ip_ver(sdp_mask, 0xF);
1192                         sdp_data->dst_addr.ip4.addr = ip4_addr;
1193                         sdp_mask->dst_addr.ip4.addr = htonl(~0);
1194                 } else {
1195                         cma_set_ip_ver(cma_data, 4);
1196                         cma_set_ip_ver(cma_mask, 0xF);
1197                         cma_data->dst_addr.ip4.addr = ip4_addr;
1198                         cma_mask->dst_addr.ip4.addr = htonl(~0);
1199                 }
1200                 break;
1201         case AF_INET6:
1202                 ip6_addr = ((struct sockaddr_in6 *) addr)->sin6_addr;
1203                 if (ps == RDMA_PS_SDP) {
1204                         sdp_set_ip_ver(sdp_data, 6);
1205                         sdp_set_ip_ver(sdp_mask, 0xF);
1206                         sdp_data->dst_addr.ip6 = ip6_addr;
1207                         memset(&sdp_mask->dst_addr.ip6, 0xFF,
1208                                sizeof sdp_mask->dst_addr.ip6);
1209                 } else {
1210                         cma_set_ip_ver(cma_data, 6);
1211                         cma_set_ip_ver(cma_mask, 0xF);
1212                         cma_data->dst_addr.ip6 = ip6_addr;
1213                         memset(&cma_mask->dst_addr.ip6, 0xFF,
1214                                sizeof cma_mask->dst_addr.ip6);
1215                 }
1216                 break;
1217         default:
1218                 break;
1219         }
1220 }
1221
1222 static int cma_iw_handler(struct iw_cm_id *iw_id, struct iw_cm_event *iw_event)
1223 {
1224         struct rdma_id_private *id_priv = iw_id->context;
1225         struct rdma_cm_event event;
1226         struct sockaddr_in *sin;
1227         int ret = 0;
1228
1229         if (cma_disable_callback(id_priv, CMA_CONNECT))
1230                 return 0;
1231
1232         memset(&event, 0, sizeof event);
1233         switch (iw_event->event) {
1234         case IW_CM_EVENT_CLOSE:
1235                 event.event = RDMA_CM_EVENT_DISCONNECTED;
1236                 break;
1237         case IW_CM_EVENT_CONNECT_REPLY:
1238                 sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1239                 *sin = iw_event->local_addr;
1240                 sin = (struct sockaddr_in *) &id_priv->id.route.addr.dst_addr;
1241                 *sin = iw_event->remote_addr;
1242                 switch (iw_event->status) {
1243                 case 0:
1244                         event.event = RDMA_CM_EVENT_ESTABLISHED;
1245                         break;
1246                 case -ECONNRESET:
1247                 case -ECONNREFUSED:
1248                         event.event = RDMA_CM_EVENT_REJECTED;
1249                         break;
1250                 case -ETIMEDOUT:
1251                         event.event = RDMA_CM_EVENT_UNREACHABLE;
1252                         break;
1253                 default:
1254                         event.event = RDMA_CM_EVENT_CONNECT_ERROR;
1255                         break;
1256                 }
1257                 break;
1258         case IW_CM_EVENT_ESTABLISHED:
1259                 event.event = RDMA_CM_EVENT_ESTABLISHED;
1260                 break;
1261         default:
1262                 BUG_ON(1);
1263         }
1264
1265         event.status = iw_event->status;
1266         event.param.conn.private_data = iw_event->private_data;
1267         event.param.conn.private_data_len = iw_event->private_data_len;
1268         ret = id_priv->id.event_handler(&id_priv->id, &event);
1269         if (ret) {
1270                 /* Destroy the CM ID by returning a non-zero value. */
1271                 id_priv->cm_id.iw = NULL;
1272                 cma_exch(id_priv, CMA_DESTROYING);
1273                 mutex_unlock(&id_priv->handler_mutex);
1274                 rdma_destroy_id(&id_priv->id);
1275                 return ret;
1276         }
1277
1278         mutex_unlock(&id_priv->handler_mutex);
1279         return ret;
1280 }
1281
1282 static int iw_conn_req_handler(struct iw_cm_id *cm_id,
1283                                struct iw_cm_event *iw_event)
1284 {
1285         struct rdma_cm_id *new_cm_id;
1286         struct rdma_id_private *listen_id, *conn_id;
1287         struct sockaddr_in *sin;
1288         struct net_device *dev = NULL;
1289         struct rdma_cm_event event;
1290         int ret;
1291         struct ib_device_attr attr;
1292
1293         listen_id = cm_id->context;
1294         if (cma_disable_callback(listen_id, CMA_LISTEN))
1295                 return -ECONNABORTED;
1296
1297         /* Create a new RDMA id for the new IW CM ID */
1298         new_cm_id = rdma_create_id(listen_id->id.event_handler,
1299                                    listen_id->id.context,
1300                                    RDMA_PS_TCP);
1301         if (IS_ERR(new_cm_id)) {
1302                 ret = -ENOMEM;
1303                 goto out;
1304         }
1305         conn_id = container_of(new_cm_id, struct rdma_id_private, id);
1306         mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
1307         conn_id->state = CMA_CONNECT;
1308
1309         dev = ip_dev_find(&init_net, iw_event->local_addr.sin_addr.s_addr);
1310         if (!dev) {
1311                 ret = -EADDRNOTAVAIL;
1312                 mutex_unlock(&conn_id->handler_mutex);
1313                 rdma_destroy_id(new_cm_id);
1314                 goto out;
1315         }
1316         ret = rdma_copy_addr(&conn_id->id.route.addr.dev_addr, dev, NULL);
1317         if (ret) {
1318                 mutex_unlock(&conn_id->handler_mutex);
1319                 rdma_destroy_id(new_cm_id);
1320                 goto out;
1321         }
1322
1323         mutex_lock(&lock);
1324         ret = cma_acquire_dev(conn_id);
1325         mutex_unlock(&lock);
1326         if (ret) {
1327                 mutex_unlock(&conn_id->handler_mutex);
1328                 rdma_destroy_id(new_cm_id);
1329                 goto out;
1330         }
1331
1332         conn_id->cm_id.iw = cm_id;
1333         cm_id->context = conn_id;
1334         cm_id->cm_handler = cma_iw_handler;
1335
1336         sin = (struct sockaddr_in *) &new_cm_id->route.addr.src_addr;
1337         *sin = iw_event->local_addr;
1338         sin = (struct sockaddr_in *) &new_cm_id->route.addr.dst_addr;
1339         *sin = iw_event->remote_addr;
1340
1341         ret = ib_query_device(conn_id->id.device, &attr);
1342         if (ret) {
1343                 mutex_unlock(&conn_id->handler_mutex);
1344                 rdma_destroy_id(new_cm_id);
1345                 goto out;
1346         }
1347
1348         memset(&event, 0, sizeof event);
1349         event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
1350         event.param.conn.private_data = iw_event->private_data;
1351         event.param.conn.private_data_len = iw_event->private_data_len;
1352         event.param.conn.initiator_depth = attr.max_qp_init_rd_atom;
1353         event.param.conn.responder_resources = attr.max_qp_rd_atom;
1354         ret = conn_id->id.event_handler(&conn_id->id, &event);
1355         if (ret) {
1356                 /* User wants to destroy the CM ID */
1357                 conn_id->cm_id.iw = NULL;
1358                 cma_exch(conn_id, CMA_DESTROYING);
1359                 mutex_unlock(&conn_id->handler_mutex);
1360                 rdma_destroy_id(&conn_id->id);
1361                 goto out;
1362         }
1363
1364         mutex_unlock(&conn_id->handler_mutex);
1365
1366 out:
1367         if (dev)
1368                 dev_put(dev);
1369         mutex_unlock(&listen_id->handler_mutex);
1370         return ret;
1371 }
1372
1373 static int cma_ib_listen(struct rdma_id_private *id_priv)
1374 {
1375         struct ib_cm_compare_data compare_data;
1376         struct sockaddr *addr;
1377         __be64 svc_id;
1378         int ret;
1379
1380         id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device, cma_req_handler,
1381                                             id_priv);
1382         if (IS_ERR(id_priv->cm_id.ib))
1383                 return PTR_ERR(id_priv->cm_id.ib);
1384
1385         addr = (struct sockaddr *) &id_priv->id.route.addr.src_addr;
1386         svc_id = cma_get_service_id(id_priv->id.ps, addr);
1387         if (cma_any_addr(addr))
1388                 ret = ib_cm_listen(id_priv->cm_id.ib, svc_id, 0, NULL);
1389         else {
1390                 cma_set_compare_data(id_priv->id.ps, addr, &compare_data);
1391                 ret = ib_cm_listen(id_priv->cm_id.ib, svc_id, 0, &compare_data);
1392         }
1393
1394         if (ret) {
1395                 ib_destroy_cm_id(id_priv->cm_id.ib);
1396                 id_priv->cm_id.ib = NULL;
1397         }
1398
1399         return ret;
1400 }
1401
1402 static int cma_iw_listen(struct rdma_id_private *id_priv, int backlog)
1403 {
1404         int ret;
1405         struct sockaddr_in *sin;
1406
1407         id_priv->cm_id.iw = iw_create_cm_id(id_priv->id.device,
1408                                             iw_conn_req_handler,
1409                                             id_priv);
1410         if (IS_ERR(id_priv->cm_id.iw))
1411                 return PTR_ERR(id_priv->cm_id.iw);
1412
1413         sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1414         id_priv->cm_id.iw->local_addr = *sin;
1415
1416         ret = iw_cm_listen(id_priv->cm_id.iw, backlog);
1417
1418         if (ret) {
1419                 iw_destroy_cm_id(id_priv->cm_id.iw);
1420                 id_priv->cm_id.iw = NULL;
1421         }
1422
1423         return ret;
1424 }
1425
1426 static int cma_listen_handler(struct rdma_cm_id *id,
1427                               struct rdma_cm_event *event)
1428 {
1429         struct rdma_id_private *id_priv = id->context;
1430
1431         id->context = id_priv->id.context;
1432         id->event_handler = id_priv->id.event_handler;
1433         return id_priv->id.event_handler(id, event);
1434 }
1435
1436 static void cma_listen_on_dev(struct rdma_id_private *id_priv,
1437                               struct cma_device *cma_dev)
1438 {
1439         struct rdma_id_private *dev_id_priv;
1440         struct rdma_cm_id *id;
1441         int ret;
1442
1443         id = rdma_create_id(cma_listen_handler, id_priv, id_priv->id.ps);
1444         if (IS_ERR(id))
1445                 return;
1446
1447         dev_id_priv = container_of(id, struct rdma_id_private, id);
1448
1449         dev_id_priv->state = CMA_ADDR_BOUND;
1450         memcpy(&id->route.addr.src_addr, &id_priv->id.route.addr.src_addr,
1451                ip_addr_size((struct sockaddr *) &id_priv->id.route.addr.src_addr));
1452
1453         cma_attach_to_dev(dev_id_priv, cma_dev);
1454         list_add_tail(&dev_id_priv->listen_list, &id_priv->listen_list);
1455         atomic_inc(&id_priv->refcount);
1456         dev_id_priv->internal_id = 1;
1457
1458         ret = rdma_listen(id, id_priv->backlog);
1459         if (ret)
1460                 printk(KERN_WARNING "RDMA CMA: cma_listen_on_dev, error %d, "
1461                        "listening on device %s\n", ret, cma_dev->device->name);
1462 }
1463
1464 static void cma_listen_on_all(struct rdma_id_private *id_priv)
1465 {
1466         struct cma_device *cma_dev;
1467
1468         mutex_lock(&lock);
1469         list_add_tail(&id_priv->list, &listen_any_list);
1470         list_for_each_entry(cma_dev, &dev_list, list)
1471                 cma_listen_on_dev(id_priv, cma_dev);
1472         mutex_unlock(&lock);
1473 }
1474
1475 int rdma_listen(struct rdma_cm_id *id, int backlog)
1476 {
1477         struct rdma_id_private *id_priv;
1478         int ret;
1479
1480         id_priv = container_of(id, struct rdma_id_private, id);
1481         if (id_priv->state == CMA_IDLE) {
1482                 ((struct sockaddr *) &id->route.addr.src_addr)->sa_family = AF_INET;
1483                 ret = rdma_bind_addr(id, (struct sockaddr *) &id->route.addr.src_addr);
1484                 if (ret)
1485                         return ret;
1486         }
1487
1488         if (!cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_LISTEN))
1489                 return -EINVAL;
1490
1491         id_priv->backlog = backlog;
1492         if (id->device) {
1493                 switch (rdma_node_get_transport(id->device->node_type)) {
1494                 case RDMA_TRANSPORT_IB:
1495                         ret = cma_ib_listen(id_priv);
1496                         if (ret)
1497                                 goto err;
1498                         break;
1499                 case RDMA_TRANSPORT_IWARP:
1500                         ret = cma_iw_listen(id_priv, backlog);
1501                         if (ret)
1502                                 goto err;
1503                         break;
1504                 default:
1505                         ret = -ENOSYS;
1506                         goto err;
1507                 }
1508         } else
1509                 cma_listen_on_all(id_priv);
1510
1511         return 0;
1512 err:
1513         id_priv->backlog = 0;
1514         cma_comp_exch(id_priv, CMA_LISTEN, CMA_ADDR_BOUND);
1515         return ret;
1516 }
1517 EXPORT_SYMBOL(rdma_listen);
1518
1519 void rdma_set_service_type(struct rdma_cm_id *id, int tos)
1520 {
1521         struct rdma_id_private *id_priv;
1522
1523         id_priv = container_of(id, struct rdma_id_private, id);
1524         id_priv->tos = (u8) tos;
1525 }
1526 EXPORT_SYMBOL(rdma_set_service_type);
1527
1528 static void cma_query_handler(int status, struct ib_sa_path_rec *path_rec,
1529                               void *context)
1530 {
1531         struct cma_work *work = context;
1532         struct rdma_route *route;
1533
1534         route = &work->id->id.route;
1535
1536         if (!status) {
1537                 route->num_paths = 1;
1538                 *route->path_rec = *path_rec;
1539         } else {
1540                 work->old_state = CMA_ROUTE_QUERY;
1541                 work->new_state = CMA_ADDR_RESOLVED;
1542                 work->event.event = RDMA_CM_EVENT_ROUTE_ERROR;
1543                 work->event.status = status;
1544         }
1545
1546         queue_work(cma_wq, &work->work);
1547 }
1548
1549 static int cma_query_ib_route(struct rdma_id_private *id_priv, int timeout_ms,
1550                               struct cma_work *work)
1551 {
1552         struct rdma_addr *addr = &id_priv->id.route.addr;
1553         struct ib_sa_path_rec path_rec;
1554         ib_sa_comp_mask comp_mask;
1555         struct sockaddr_in6 *sin6;
1556
1557         memset(&path_rec, 0, sizeof path_rec);
1558         rdma_addr_get_sgid(&addr->dev_addr, &path_rec.sgid);
1559         rdma_addr_get_dgid(&addr->dev_addr, &path_rec.dgid);
1560         path_rec.pkey = cpu_to_be16(ib_addr_get_pkey(&addr->dev_addr));
1561         path_rec.numb_path = 1;
1562         path_rec.reversible = 1;
1563         path_rec.service_id = cma_get_service_id(id_priv->id.ps,
1564                                                         (struct sockaddr *) &addr->dst_addr);
1565
1566         comp_mask = IB_SA_PATH_REC_DGID | IB_SA_PATH_REC_SGID |
1567                     IB_SA_PATH_REC_PKEY | IB_SA_PATH_REC_NUMB_PATH |
1568                     IB_SA_PATH_REC_REVERSIBLE | IB_SA_PATH_REC_SERVICE_ID;
1569
1570         if (addr->src_addr.ss_family == AF_INET) {
1571                 path_rec.qos_class = cpu_to_be16((u16) id_priv->tos);
1572                 comp_mask |= IB_SA_PATH_REC_QOS_CLASS;
1573         } else {
1574                 sin6 = (struct sockaddr_in6 *) &addr->src_addr;
1575                 path_rec.traffic_class = (u8) (be32_to_cpu(sin6->sin6_flowinfo) >> 20);
1576                 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
1577         }
1578
1579         id_priv->query_id = ib_sa_path_rec_get(&sa_client, id_priv->id.device,
1580                                                id_priv->id.port_num, &path_rec,
1581                                                comp_mask, timeout_ms,
1582                                                GFP_KERNEL, cma_query_handler,
1583                                                work, &id_priv->query);
1584
1585         return (id_priv->query_id < 0) ? id_priv->query_id : 0;
1586 }
1587
1588 static void cma_work_handler(struct work_struct *_work)
1589 {
1590         struct cma_work *work = container_of(_work, struct cma_work, work);
1591         struct rdma_id_private *id_priv = work->id;
1592         int destroy = 0;
1593
1594         mutex_lock(&id_priv->handler_mutex);
1595         if (!cma_comp_exch(id_priv, work->old_state, work->new_state))
1596                 goto out;
1597
1598         if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
1599                 cma_exch(id_priv, CMA_DESTROYING);
1600                 destroy = 1;
1601         }
1602 out:
1603         mutex_unlock(&id_priv->handler_mutex);
1604         cma_deref_id(id_priv);
1605         if (destroy)
1606                 rdma_destroy_id(&id_priv->id);
1607         kfree(work);
1608 }
1609
1610 static void cma_ndev_work_handler(struct work_struct *_work)
1611 {
1612         struct cma_ndev_work *work = container_of(_work, struct cma_ndev_work, work);
1613         struct rdma_id_private *id_priv = work->id;
1614         int destroy = 0;
1615
1616         mutex_lock(&id_priv->handler_mutex);
1617         if (id_priv->state == CMA_DESTROYING ||
1618             id_priv->state == CMA_DEVICE_REMOVAL)
1619                 goto out;
1620
1621         if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
1622                 cma_exch(id_priv, CMA_DESTROYING);
1623                 destroy = 1;
1624         }
1625
1626 out:
1627         mutex_unlock(&id_priv->handler_mutex);
1628         cma_deref_id(id_priv);
1629         if (destroy)
1630                 rdma_destroy_id(&id_priv->id);
1631         kfree(work);
1632 }
1633
1634 static int cma_resolve_ib_route(struct rdma_id_private *id_priv, int timeout_ms)
1635 {
1636         struct rdma_route *route = &id_priv->id.route;
1637         struct cma_work *work;
1638         int ret;
1639
1640         work = kzalloc(sizeof *work, GFP_KERNEL);
1641         if (!work)
1642                 return -ENOMEM;
1643
1644         work->id = id_priv;
1645         INIT_WORK(&work->work, cma_work_handler);
1646         work->old_state = CMA_ROUTE_QUERY;
1647         work->new_state = CMA_ROUTE_RESOLVED;
1648         work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
1649
1650         route->path_rec = kmalloc(sizeof *route->path_rec, GFP_KERNEL);
1651         if (!route->path_rec) {
1652                 ret = -ENOMEM;
1653                 goto err1;
1654         }
1655
1656         ret = cma_query_ib_route(id_priv, timeout_ms, work);
1657         if (ret)
1658                 goto err2;
1659
1660         return 0;
1661 err2:
1662         kfree(route->path_rec);
1663         route->path_rec = NULL;
1664 err1:
1665         kfree(work);
1666         return ret;
1667 }
1668
1669 int rdma_set_ib_paths(struct rdma_cm_id *id,
1670                       struct ib_sa_path_rec *path_rec, int num_paths)
1671 {
1672         struct rdma_id_private *id_priv;
1673         int ret;
1674
1675         id_priv = container_of(id, struct rdma_id_private, id);
1676         if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ROUTE_RESOLVED))
1677                 return -EINVAL;
1678
1679         id->route.path_rec = kmemdup(path_rec, sizeof *path_rec * num_paths,
1680                                      GFP_KERNEL);
1681         if (!id->route.path_rec) {
1682                 ret = -ENOMEM;
1683                 goto err;
1684         }
1685
1686         id->route.num_paths = num_paths;
1687         return 0;
1688 err:
1689         cma_comp_exch(id_priv, CMA_ROUTE_RESOLVED, CMA_ADDR_RESOLVED);
1690         return ret;
1691 }
1692 EXPORT_SYMBOL(rdma_set_ib_paths);
1693
1694 static int cma_resolve_iw_route(struct rdma_id_private *id_priv, int timeout_ms)
1695 {
1696         struct cma_work *work;
1697
1698         work = kzalloc(sizeof *work, GFP_KERNEL);
1699         if (!work)
1700                 return -ENOMEM;
1701
1702         work->id = id_priv;
1703         INIT_WORK(&work->work, cma_work_handler);
1704         work->old_state = CMA_ROUTE_QUERY;
1705         work->new_state = CMA_ROUTE_RESOLVED;
1706         work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
1707         queue_work(cma_wq, &work->work);
1708         return 0;
1709 }
1710
1711 int rdma_resolve_route(struct rdma_cm_id *id, int timeout_ms)
1712 {
1713         struct rdma_id_private *id_priv;
1714         int ret;
1715
1716         id_priv = container_of(id, struct rdma_id_private, id);
1717         if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ROUTE_QUERY))
1718                 return -EINVAL;
1719
1720         atomic_inc(&id_priv->refcount);
1721         switch (rdma_node_get_transport(id->device->node_type)) {
1722         case RDMA_TRANSPORT_IB:
1723                 ret = cma_resolve_ib_route(id_priv, timeout_ms);
1724                 break;
1725         case RDMA_TRANSPORT_IWARP:
1726                 ret = cma_resolve_iw_route(id_priv, timeout_ms);
1727                 break;
1728         default:
1729                 ret = -ENOSYS;
1730                 break;
1731         }
1732         if (ret)
1733                 goto err;
1734
1735         return 0;
1736 err:
1737         cma_comp_exch(id_priv, CMA_ROUTE_QUERY, CMA_ADDR_RESOLVED);
1738         cma_deref_id(id_priv);
1739         return ret;
1740 }
1741 EXPORT_SYMBOL(rdma_resolve_route);
1742
1743 static int cma_bind_loopback(struct rdma_id_private *id_priv)
1744 {
1745         struct cma_device *cma_dev;
1746         struct ib_port_attr port_attr;
1747         union ib_gid gid;
1748         u16 pkey;
1749         int ret;
1750         u8 p;
1751
1752         mutex_lock(&lock);
1753         if (list_empty(&dev_list)) {
1754                 ret = -ENODEV;
1755                 goto out;
1756         }
1757         list_for_each_entry(cma_dev, &dev_list, list)
1758                 for (p = 1; p <= cma_dev->device->phys_port_cnt; ++p)
1759                         if (!ib_query_port(cma_dev->device, p, &port_attr) &&
1760                             port_attr.state == IB_PORT_ACTIVE)
1761                                 goto port_found;
1762
1763         p = 1;
1764         cma_dev = list_entry(dev_list.next, struct cma_device, list);
1765
1766 port_found:
1767         ret = ib_get_cached_gid(cma_dev->device, p, 0, &gid);
1768         if (ret)
1769                 goto out;
1770
1771         ret = ib_get_cached_pkey(cma_dev->device, p, 0, &pkey);
1772         if (ret)
1773                 goto out;
1774
1775         id_priv->id.route.addr.dev_addr.dev_type =
1776                 (rdma_node_get_transport(cma_dev->device->node_type) == RDMA_TRANSPORT_IB) ?
1777                 ARPHRD_INFINIBAND : ARPHRD_ETHER;
1778
1779         rdma_addr_set_sgid(&id_priv->id.route.addr.dev_addr, &gid);
1780         ib_addr_set_pkey(&id_priv->id.route.addr.dev_addr, pkey);
1781         id_priv->id.port_num = p;
1782         cma_attach_to_dev(id_priv, cma_dev);
1783 out:
1784         mutex_unlock(&lock);
1785         return ret;
1786 }
1787
1788 static void addr_handler(int status, struct sockaddr *src_addr,
1789                          struct rdma_dev_addr *dev_addr, void *context)
1790 {
1791         struct rdma_id_private *id_priv = context;
1792         struct rdma_cm_event event;
1793
1794         memset(&event, 0, sizeof event);
1795         mutex_lock(&id_priv->handler_mutex);
1796
1797         /*
1798          * Grab mutex to block rdma_destroy_id() from removing the device while
1799          * we're trying to acquire it.
1800          */
1801         mutex_lock(&lock);
1802         if (!cma_comp_exch(id_priv, CMA_ADDR_QUERY, CMA_ADDR_RESOLVED)) {
1803                 mutex_unlock(&lock);
1804                 goto out;
1805         }
1806
1807         if (!status && !id_priv->cma_dev)
1808                 status = cma_acquire_dev(id_priv);
1809         mutex_unlock(&lock);
1810
1811         if (status) {
1812                 if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ADDR_BOUND))
1813                         goto out;
1814                 event.event = RDMA_CM_EVENT_ADDR_ERROR;
1815                 event.status = status;
1816         } else {
1817                 memcpy(&id_priv->id.route.addr.src_addr, src_addr,
1818                        ip_addr_size(src_addr));
1819                 event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
1820         }
1821
1822         if (id_priv->id.event_handler(&id_priv->id, &event)) {
1823                 cma_exch(id_priv, CMA_DESTROYING);
1824                 mutex_unlock(&id_priv->handler_mutex);
1825                 cma_deref_id(id_priv);
1826                 rdma_destroy_id(&id_priv->id);
1827                 return;
1828         }
1829 out:
1830         mutex_unlock(&id_priv->handler_mutex);
1831         cma_deref_id(id_priv);
1832 }
1833
1834 static int cma_resolve_loopback(struct rdma_id_private *id_priv)
1835 {
1836         struct cma_work *work;
1837         struct sockaddr *src, *dst;
1838         union ib_gid gid;
1839         int ret;
1840
1841         work = kzalloc(sizeof *work, GFP_KERNEL);
1842         if (!work)
1843                 return -ENOMEM;
1844
1845         if (!id_priv->cma_dev) {
1846                 ret = cma_bind_loopback(id_priv);
1847                 if (ret)
1848                         goto err;
1849         }
1850
1851         rdma_addr_get_sgid(&id_priv->id.route.addr.dev_addr, &gid);
1852         rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, &gid);
1853
1854         src = (struct sockaddr *) &id_priv->id.route.addr.src_addr;
1855         if (cma_zero_addr(src)) {
1856                 dst = (struct sockaddr *) &id_priv->id.route.addr.dst_addr;
1857                 if ((src->sa_family = dst->sa_family) == AF_INET) {
1858                         ((struct sockaddr_in *) src)->sin_addr.s_addr =
1859                                 ((struct sockaddr_in *) dst)->sin_addr.s_addr;
1860                 } else {
1861                         ipv6_addr_copy(&((struct sockaddr_in6 *) src)->sin6_addr,
1862                                        &((struct sockaddr_in6 *) dst)->sin6_addr);
1863                 }
1864         }
1865
1866         work->id = id_priv;
1867         INIT_WORK(&work->work, cma_work_handler);
1868         work->old_state = CMA_ADDR_QUERY;
1869         work->new_state = CMA_ADDR_RESOLVED;
1870         work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
1871         queue_work(cma_wq, &work->work);
1872         return 0;
1873 err:
1874         kfree(work);
1875         return ret;
1876 }
1877
1878 static int cma_bind_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
1879                          struct sockaddr *dst_addr)
1880 {
1881         if (!src_addr || !src_addr->sa_family) {
1882                 src_addr = (struct sockaddr *) &id->route.addr.src_addr;
1883                 if ((src_addr->sa_family = dst_addr->sa_family) == AF_INET6) {
1884                         ((struct sockaddr_in6 *) src_addr)->sin6_scope_id =
1885                                 ((struct sockaddr_in6 *) dst_addr)->sin6_scope_id;
1886                 }
1887         }
1888         return rdma_bind_addr(id, src_addr);
1889 }
1890
1891 int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
1892                       struct sockaddr *dst_addr, int timeout_ms)
1893 {
1894         struct rdma_id_private *id_priv;
1895         int ret;
1896
1897         id_priv = container_of(id, struct rdma_id_private, id);
1898         if (id_priv->state == CMA_IDLE) {
1899                 ret = cma_bind_addr(id, src_addr, dst_addr);
1900                 if (ret)
1901                         return ret;
1902         }
1903
1904         if (!cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_ADDR_QUERY))
1905                 return -EINVAL;
1906
1907         atomic_inc(&id_priv->refcount);
1908         memcpy(&id->route.addr.dst_addr, dst_addr, ip_addr_size(dst_addr));
1909         if (cma_any_addr(dst_addr))
1910                 ret = cma_resolve_loopback(id_priv);
1911         else
1912                 ret = rdma_resolve_ip(&addr_client, (struct sockaddr *) &id->route.addr.src_addr,
1913                                       dst_addr, &id->route.addr.dev_addr,
1914                                       timeout_ms, addr_handler, id_priv);
1915         if (ret)
1916                 goto err;
1917
1918         return 0;
1919 err:
1920         cma_comp_exch(id_priv, CMA_ADDR_QUERY, CMA_ADDR_BOUND);
1921         cma_deref_id(id_priv);
1922         return ret;
1923 }
1924 EXPORT_SYMBOL(rdma_resolve_addr);
1925
1926 static void cma_bind_port(struct rdma_bind_list *bind_list,
1927                           struct rdma_id_private *id_priv)
1928 {
1929         struct sockaddr_in *sin;
1930
1931         sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1932         sin->sin_port = htons(bind_list->port);
1933         id_priv->bind_list = bind_list;
1934         hlist_add_head(&id_priv->node, &bind_list->owners);
1935 }
1936
1937 static int cma_alloc_port(struct idr *ps, struct rdma_id_private *id_priv,
1938                           unsigned short snum)
1939 {
1940         struct rdma_bind_list *bind_list;
1941         int port, ret;
1942
1943         bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL);
1944         if (!bind_list)
1945                 return -ENOMEM;
1946
1947         do {
1948                 ret = idr_get_new_above(ps, bind_list, snum, &port);
1949         } while ((ret == -EAGAIN) && idr_pre_get(ps, GFP_KERNEL));
1950
1951         if (ret)
1952                 goto err1;
1953
1954         if (port != snum) {
1955                 ret = -EADDRNOTAVAIL;
1956                 goto err2;
1957         }
1958
1959         bind_list->ps = ps;
1960         bind_list->port = (unsigned short) port;
1961         cma_bind_port(bind_list, id_priv);
1962         return 0;
1963 err2:
1964         idr_remove(ps, port);
1965 err1:
1966         kfree(bind_list);
1967         return ret;
1968 }
1969
1970 static int cma_alloc_any_port(struct idr *ps, struct rdma_id_private *id_priv)
1971 {
1972         static unsigned int last_used_port;
1973         int low, high, remaining;
1974         unsigned int rover;
1975
1976         inet_get_local_port_range(&low, &high);
1977         remaining = (high - low) + 1;
1978         rover = net_random() % remaining + low;
1979 retry:
1980         if (last_used_port != rover &&
1981             !idr_find(ps, (unsigned short) rover)) {
1982                 int ret = cma_alloc_port(ps, id_priv, rover);
1983                 /*
1984                  * Remember previously used port number in order to avoid
1985                  * re-using same port immediately after it is closed.
1986                  */
1987                 if (!ret)
1988                         last_used_port = rover;
1989                 if (ret != -EADDRNOTAVAIL)
1990                         return ret;
1991         }
1992         if (--remaining) {
1993                 rover++;
1994                 if ((rover < low) || (rover > high))
1995                         rover = low;
1996                 goto retry;
1997         }
1998         return -EADDRNOTAVAIL;
1999 }
2000
2001 static int cma_use_port(struct idr *ps, struct rdma_id_private *id_priv)
2002 {
2003         struct rdma_id_private *cur_id;
2004         struct sockaddr_in *sin, *cur_sin;
2005         struct rdma_bind_list *bind_list;
2006         struct hlist_node *node;
2007         unsigned short snum;
2008
2009         sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
2010         snum = ntohs(sin->sin_port);
2011         if (snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
2012                 return -EACCES;
2013
2014         bind_list = idr_find(ps, snum);
2015         if (!bind_list)
2016                 return cma_alloc_port(ps, id_priv, snum);
2017
2018         /*
2019          * We don't support binding to any address if anyone is bound to
2020          * a specific address on the same port.
2021          */
2022         if (cma_any_addr((struct sockaddr *) &id_priv->id.route.addr.src_addr))
2023                 return -EADDRNOTAVAIL;
2024
2025         hlist_for_each_entry(cur_id, node, &bind_list->owners, node) {
2026                 if (cma_any_addr((struct sockaddr *) &cur_id->id.route.addr.src_addr))
2027                         return -EADDRNOTAVAIL;
2028
2029                 cur_sin = (struct sockaddr_in *) &cur_id->id.route.addr.src_addr;
2030                 if (sin->sin_addr.s_addr == cur_sin->sin_addr.s_addr)
2031                         return -EADDRINUSE;
2032         }
2033
2034         cma_bind_port(bind_list, id_priv);
2035         return 0;
2036 }
2037
2038 static int cma_get_port(struct rdma_id_private *id_priv)
2039 {
2040         struct idr *ps;
2041         int ret;
2042
2043         switch (id_priv->id.ps) {
2044         case RDMA_PS_SDP:
2045                 ps = &sdp_ps;
2046                 break;
2047         case RDMA_PS_TCP:
2048                 ps = &tcp_ps;
2049                 break;
2050         case RDMA_PS_UDP:
2051                 ps = &udp_ps;
2052                 break;
2053         case RDMA_PS_IPOIB:
2054                 ps = &ipoib_ps;
2055                 break;
2056         default:
2057                 return -EPROTONOSUPPORT;
2058         }
2059
2060         mutex_lock(&lock);
2061         if (cma_any_port((struct sockaddr *) &id_priv->id.route.addr.src_addr))
2062                 ret = cma_alloc_any_port(ps, id_priv);
2063         else
2064                 ret = cma_use_port(ps, id_priv);
2065         mutex_unlock(&lock);
2066
2067         return ret;
2068 }
2069
2070 static int cma_check_linklocal(struct rdma_dev_addr *dev_addr,
2071                                struct sockaddr *addr)
2072 {
2073 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2074         struct sockaddr_in6 *sin6;
2075
2076         if (addr->sa_family != AF_INET6)
2077                 return 0;
2078
2079         sin6 = (struct sockaddr_in6 *) addr;
2080         if ((ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) &&
2081             !sin6->sin6_scope_id)
2082                         return -EINVAL;
2083
2084         dev_addr->bound_dev_if = sin6->sin6_scope_id;
2085 #endif
2086         return 0;
2087 }
2088
2089 int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr)
2090 {
2091         struct rdma_id_private *id_priv;
2092         int ret;
2093
2094         if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6)
2095                 return -EAFNOSUPPORT;
2096
2097         id_priv = container_of(id, struct rdma_id_private, id);
2098         if (!cma_comp_exch(id_priv, CMA_IDLE, CMA_ADDR_BOUND))
2099                 return -EINVAL;
2100
2101         ret = cma_check_linklocal(&id->route.addr.dev_addr, addr);
2102         if (ret)
2103                 goto err1;
2104
2105         if (!cma_any_addr(addr)) {
2106                 ret = rdma_translate_ip(addr, &id->route.addr.dev_addr);
2107                 if (ret)
2108                         goto err1;
2109
2110                 mutex_lock(&lock);
2111                 ret = cma_acquire_dev(id_priv);
2112                 mutex_unlock(&lock);
2113                 if (ret)
2114                         goto err1;
2115         }
2116
2117         memcpy(&id->route.addr.src_addr, addr, ip_addr_size(addr));
2118         ret = cma_get_port(id_priv);
2119         if (ret)
2120                 goto err2;
2121
2122         return 0;
2123 err2:
2124         if (id_priv->cma_dev) {
2125                 mutex_lock(&lock);
2126                 cma_detach_from_dev(id_priv);
2127                 mutex_unlock(&lock);
2128         }
2129 err1:
2130         cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_IDLE);
2131         return ret;
2132 }
2133 EXPORT_SYMBOL(rdma_bind_addr);
2134
2135 static int cma_format_hdr(void *hdr, enum rdma_port_space ps,
2136                           struct rdma_route *route)
2137 {
2138         struct cma_hdr *cma_hdr;
2139         struct sdp_hh *sdp_hdr;
2140
2141         if (route->addr.src_addr.ss_family == AF_INET) {
2142                 struct sockaddr_in *src4, *dst4;
2143
2144                 src4 = (struct sockaddr_in *) &route->addr.src_addr;
2145                 dst4 = (struct sockaddr_in *) &route->addr.dst_addr;
2146
2147                 switch (ps) {
2148                 case RDMA_PS_SDP:
2149                         sdp_hdr = hdr;
2150                         if (sdp_get_majv(sdp_hdr->sdp_version) != SDP_MAJ_VERSION)
2151                                 return -EINVAL;
2152                         sdp_set_ip_ver(sdp_hdr, 4);
2153                         sdp_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
2154                         sdp_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
2155                         sdp_hdr->port = src4->sin_port;
2156                         break;
2157                 default:
2158                         cma_hdr = hdr;
2159                         cma_hdr->cma_version = CMA_VERSION;
2160                         cma_set_ip_ver(cma_hdr, 4);
2161                         cma_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
2162                         cma_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
2163                         cma_hdr->port = src4->sin_port;
2164                         break;
2165                 }
2166         } else {
2167                 struct sockaddr_in6 *src6, *dst6;
2168
2169                 src6 = (struct sockaddr_in6 *) &route->addr.src_addr;
2170                 dst6 = (struct sockaddr_in6 *) &route->addr.dst_addr;
2171
2172                 switch (ps) {
2173                 case RDMA_PS_SDP:
2174                         sdp_hdr = hdr;
2175                         if (sdp_get_majv(sdp_hdr->sdp_version) != SDP_MAJ_VERSION)
2176                                 return -EINVAL;
2177                         sdp_set_ip_ver(sdp_hdr, 6);
2178                         sdp_hdr->src_addr.ip6 = src6->sin6_addr;
2179                         sdp_hdr->dst_addr.ip6 = dst6->sin6_addr;
2180                         sdp_hdr->port = src6->sin6_port;
2181                         break;
2182                 default:
2183                         cma_hdr = hdr;
2184                         cma_hdr->cma_version = CMA_VERSION;
2185                         cma_set_ip_ver(cma_hdr, 6);
2186                         cma_hdr->src_addr.ip6 = src6->sin6_addr;
2187                         cma_hdr->dst_addr.ip6 = dst6->sin6_addr;
2188                         cma_hdr->port = src6->sin6_port;
2189                         break;
2190                 }
2191         }
2192         return 0;
2193 }
2194
2195 static int cma_sidr_rep_handler(struct ib_cm_id *cm_id,
2196                                 struct ib_cm_event *ib_event)
2197 {
2198         struct rdma_id_private *id_priv = cm_id->context;
2199         struct rdma_cm_event event;
2200         struct ib_cm_sidr_rep_event_param *rep = &ib_event->param.sidr_rep_rcvd;
2201         int ret = 0;
2202
2203         if (cma_disable_callback(id_priv, CMA_CONNECT))
2204                 return 0;
2205
2206         memset(&event, 0, sizeof event);
2207         switch (ib_event->event) {
2208         case IB_CM_SIDR_REQ_ERROR:
2209                 event.event = RDMA_CM_EVENT_UNREACHABLE;
2210                 event.status = -ETIMEDOUT;
2211                 break;
2212         case IB_CM_SIDR_REP_RECEIVED:
2213                 event.param.ud.private_data = ib_event->private_data;
2214                 event.param.ud.private_data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
2215                 if (rep->status != IB_SIDR_SUCCESS) {
2216                         event.event = RDMA_CM_EVENT_UNREACHABLE;
2217                         event.status = ib_event->param.sidr_rep_rcvd.status;
2218                         break;
2219                 }
2220                 ret = cma_set_qkey(id_priv);
2221                 if (ret) {
2222                         event.event = RDMA_CM_EVENT_ADDR_ERROR;
2223                         event.status = -EINVAL;
2224                         break;
2225                 }
2226                 if (id_priv->qkey != rep->qkey) {
2227                         event.event = RDMA_CM_EVENT_UNREACHABLE;
2228                         event.status = -EINVAL;
2229                         break;
2230                 }
2231                 ib_init_ah_from_path(id_priv->id.device, id_priv->id.port_num,
2232                                      id_priv->id.route.path_rec,
2233                                      &event.param.ud.ah_attr);
2234                 event.param.ud.qp_num = rep->qpn;
2235                 event.param.ud.qkey = rep->qkey;
2236                 event.event = RDMA_CM_EVENT_ESTABLISHED;
2237                 event.status = 0;
2238                 break;
2239         default:
2240                 printk(KERN_ERR "RDMA CMA: unexpected IB CM event: %d\n",
2241                        ib_event->event);
2242                 goto out;
2243         }
2244
2245         ret = id_priv->id.event_handler(&id_priv->id, &event);
2246         if (ret) {
2247                 /* Destroy the CM ID by returning a non-zero value. */
2248                 id_priv->cm_id.ib = NULL;
2249                 cma_exch(id_priv, CMA_DESTROYING);
2250                 mutex_unlock(&id_priv->handler_mutex);
2251                 rdma_destroy_id(&id_priv->id);
2252                 return ret;
2253         }
2254 out:
2255         mutex_unlock(&id_priv->handler_mutex);
2256         return ret;
2257 }
2258
2259 static int cma_resolve_ib_udp(struct rdma_id_private *id_priv,
2260                               struct rdma_conn_param *conn_param)
2261 {
2262         struct ib_cm_sidr_req_param req;
2263         struct rdma_route *route;
2264         int ret;
2265
2266         req.private_data_len = sizeof(struct cma_hdr) +
2267                                conn_param->private_data_len;
2268         req.private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
2269         if (!req.private_data)
2270                 return -ENOMEM;
2271
2272         if (conn_param->private_data && conn_param->private_data_len)
2273                 memcpy((void *) req.private_data + sizeof(struct cma_hdr),
2274                        conn_param->private_data, conn_param->private_data_len);
2275
2276         route = &id_priv->id.route;
2277         ret = cma_format_hdr((void *) req.private_data, id_priv->id.ps, route);
2278         if (ret)
2279                 goto out;
2280
2281         id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device,
2282                                             cma_sidr_rep_handler, id_priv);
2283         if (IS_ERR(id_priv->cm_id.ib)) {
2284                 ret = PTR_ERR(id_priv->cm_id.ib);
2285                 goto out;
2286         }
2287
2288         req.path = route->path_rec;
2289         req.service_id = cma_get_service_id(id_priv->id.ps,
2290                                             (struct sockaddr *) &route->addr.dst_addr);
2291         req.timeout_ms = 1 << (CMA_CM_RESPONSE_TIMEOUT - 8);
2292         req.max_cm_retries = CMA_MAX_CM_RETRIES;
2293
2294         ret = ib_send_cm_sidr_req(id_priv->cm_id.ib, &req);
2295         if (ret) {
2296                 ib_destroy_cm_id(id_priv->cm_id.ib);
2297                 id_priv->cm_id.ib = NULL;
2298         }
2299 out:
2300         kfree(req.private_data);
2301         return ret;
2302 }
2303
2304 static int cma_connect_ib(struct rdma_id_private *id_priv,
2305                           struct rdma_conn_param *conn_param)
2306 {
2307         struct ib_cm_req_param req;
2308         struct rdma_route *route;
2309         void *private_data;
2310         int offset, ret;
2311
2312         memset(&req, 0, sizeof req);
2313         offset = cma_user_data_offset(id_priv->id.ps);
2314         req.private_data_len = offset + conn_param->private_data_len;
2315         private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
2316         if (!private_data)
2317                 return -ENOMEM;
2318
2319         if (conn_param->private_data && conn_param->private_data_len)
2320                 memcpy(private_data + offset, conn_param->private_data,
2321                        conn_param->private_data_len);
2322
2323         id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device, cma_ib_handler,
2324                                             id_priv);
2325         if (IS_ERR(id_priv->cm_id.ib)) {
2326                 ret = PTR_ERR(id_priv->cm_id.ib);
2327                 goto out;
2328         }
2329
2330         route = &id_priv->id.route;
2331         ret = cma_format_hdr(private_data, id_priv->id.ps, route);
2332         if (ret)
2333                 goto out;
2334         req.private_data = private_data;
2335
2336         req.primary_path = &route->path_rec[0];
2337         if (route->num_paths == 2)
2338                 req.alternate_path = &route->path_rec[1];
2339
2340         req.service_id = cma_get_service_id(id_priv->id.ps,
2341                                             (struct sockaddr *) &route->addr.dst_addr);
2342         req.qp_num = id_priv->qp_num;
2343         req.qp_type = IB_QPT_RC;
2344         req.starting_psn = id_priv->seq_num;
2345         req.responder_resources = conn_param->responder_resources;
2346         req.initiator_depth = conn_param->initiator_depth;
2347         req.flow_control = conn_param->flow_control;
2348         req.retry_count = conn_param->retry_count;
2349         req.rnr_retry_count = conn_param->rnr_retry_count;
2350         req.remote_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
2351         req.local_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
2352         req.max_cm_retries = CMA_MAX_CM_RETRIES;
2353         req.srq = id_priv->srq ? 1 : 0;
2354
2355         ret = ib_send_cm_req(id_priv->cm_id.ib, &req);
2356 out:
2357         if (ret && !IS_ERR(id_priv->cm_id.ib)) {
2358                 ib_destroy_cm_id(id_priv->cm_id.ib);
2359                 id_priv->cm_id.ib = NULL;
2360         }
2361
2362         kfree(private_data);
2363         return ret;
2364 }
2365
2366 static int cma_connect_iw(struct rdma_id_private *id_priv,
2367                           struct rdma_conn_param *conn_param)
2368 {
2369         struct iw_cm_id *cm_id;
2370         struct sockaddr_in* sin;
2371         int ret;
2372         struct iw_cm_conn_param iw_param;
2373
2374         cm_id = iw_create_cm_id(id_priv->id.device, cma_iw_handler, id_priv);
2375         if (IS_ERR(cm_id)) {
2376                 ret = PTR_ERR(cm_id);
2377                 goto out;
2378         }
2379
2380         id_priv->cm_id.iw = cm_id;
2381
2382         sin = (struct sockaddr_in*) &id_priv->id.route.addr.src_addr;
2383         cm_id->local_addr = *sin;
2384
2385         sin = (struct sockaddr_in*) &id_priv->id.route.addr.dst_addr;
2386         cm_id->remote_addr = *sin;
2387
2388         ret = cma_modify_qp_rtr(id_priv, conn_param);
2389         if (ret)
2390                 goto out;
2391
2392         iw_param.ord = conn_param->initiator_depth;
2393         iw_param.ird = conn_param->responder_resources;
2394         iw_param.private_data = conn_param->private_data;
2395         iw_param.private_data_len = conn_param->private_data_len;
2396         if (id_priv->id.qp)
2397                 iw_param.qpn = id_priv->qp_num;
2398         else
2399                 iw_param.qpn = conn_param->qp_num;
2400         ret = iw_cm_connect(cm_id, &iw_param);
2401 out:
2402         if (ret && !IS_ERR(cm_id)) {
2403                 iw_destroy_cm_id(cm_id);
2404                 id_priv->cm_id.iw = NULL;
2405         }
2406         return ret;
2407 }
2408
2409 int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
2410 {
2411         struct rdma_id_private *id_priv;
2412         int ret;
2413
2414         id_priv = container_of(id, struct rdma_id_private, id);
2415         if (!cma_comp_exch(id_priv, CMA_ROUTE_RESOLVED, CMA_CONNECT))
2416                 return -EINVAL;
2417
2418         if (!id->qp) {
2419                 id_priv->qp_num = conn_param->qp_num;
2420                 id_priv->srq = conn_param->srq;
2421         }
2422
2423         switch (rdma_node_get_transport(id->device->node_type)) {
2424         case RDMA_TRANSPORT_IB:
2425                 if (cma_is_ud_ps(id->ps))
2426                         ret = cma_resolve_ib_udp(id_priv, conn_param);
2427                 else
2428                         ret = cma_connect_ib(id_priv, conn_param);
2429                 break;
2430         case RDMA_TRANSPORT_IWARP:
2431                 ret = cma_connect_iw(id_priv, conn_param);
2432                 break;
2433         default:
2434                 ret = -ENOSYS;
2435                 break;
2436         }
2437         if (ret)
2438                 goto err;
2439
2440         return 0;
2441 err:
2442         cma_comp_exch(id_priv, CMA_CONNECT, CMA_ROUTE_RESOLVED);
2443         return ret;
2444 }
2445 EXPORT_SYMBOL(rdma_connect);
2446
2447 static int cma_accept_ib(struct rdma_id_private *id_priv,
2448                          struct rdma_conn_param *conn_param)
2449 {
2450         struct ib_cm_rep_param rep;
2451         int ret;
2452
2453         ret = cma_modify_qp_rtr(id_priv, conn_param);
2454         if (ret)
2455                 goto out;
2456
2457         ret = cma_modify_qp_rts(id_priv, conn_param);
2458         if (ret)
2459                 goto out;
2460
2461         memset(&rep, 0, sizeof rep);
2462         rep.qp_num = id_priv->qp_num;
2463         rep.starting_psn = id_priv->seq_num;
2464         rep.private_data = conn_param->private_data;
2465         rep.private_data_len = conn_param->private_data_len;
2466         rep.responder_resources = conn_param->responder_resources;
2467         rep.initiator_depth = conn_param->initiator_depth;
2468         rep.failover_accepted = 0;
2469         rep.flow_control = conn_param->flow_control;
2470         rep.rnr_retry_count = conn_param->rnr_retry_count;
2471         rep.srq = id_priv->srq ? 1 : 0;
2472
2473         ret = ib_send_cm_rep(id_priv->cm_id.ib, &rep);
2474 out:
2475         return ret;
2476 }
2477
2478 static int cma_accept_iw(struct rdma_id_private *id_priv,
2479                   struct rdma_conn_param *conn_param)
2480 {
2481         struct iw_cm_conn_param iw_param;
2482         int ret;
2483
2484         ret = cma_modify_qp_rtr(id_priv, conn_param);
2485         if (ret)
2486                 return ret;
2487
2488         iw_param.ord = conn_param->initiator_depth;
2489         iw_param.ird = conn_param->responder_resources;
2490         iw_param.private_data = conn_param->private_data;
2491         iw_param.private_data_len = conn_param->private_data_len;
2492         if (id_priv->id.qp) {
2493                 iw_param.qpn = id_priv->qp_num;
2494         } else
2495                 iw_param.qpn = conn_param->qp_num;
2496
2497         return iw_cm_accept(id_priv->cm_id.iw, &iw_param);
2498 }
2499
2500 static int cma_send_sidr_rep(struct rdma_id_private *id_priv,
2501                              enum ib_cm_sidr_status status,
2502                              const void *private_data, int private_data_len)
2503 {
2504         struct ib_cm_sidr_rep_param rep;
2505         int ret;
2506
2507         memset(&rep, 0, sizeof rep);
2508         rep.status = status;
2509         if (status == IB_SIDR_SUCCESS) {
2510                 ret = cma_set_qkey(id_priv);
2511                 if (ret)
2512                         return ret;
2513                 rep.qp_num = id_priv->qp_num;
2514                 rep.qkey = id_priv->qkey;
2515         }
2516         rep.private_data = private_data;
2517         rep.private_data_len = private_data_len;
2518
2519         return ib_send_cm_sidr_rep(id_priv->cm_id.ib, &rep);
2520 }
2521
2522 int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
2523 {
2524         struct rdma_id_private *id_priv;
2525         int ret;
2526
2527         id_priv = container_of(id, struct rdma_id_private, id);
2528         if (!cma_comp(id_priv, CMA_CONNECT))
2529                 return -EINVAL;
2530
2531         if (!id->qp && conn_param) {
2532                 id_priv->qp_num = conn_param->qp_num;
2533                 id_priv->srq = conn_param->srq;
2534         }
2535
2536         switch (rdma_node_get_transport(id->device->node_type)) {
2537         case RDMA_TRANSPORT_IB:
2538                 if (cma_is_ud_ps(id->ps))
2539                         ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
2540                                                 conn_param->private_data,
2541                                                 conn_param->private_data_len);
2542                 else if (conn_param)
2543                         ret = cma_accept_ib(id_priv, conn_param);
2544                 else
2545                         ret = cma_rep_recv(id_priv);
2546                 break;
2547         case RDMA_TRANSPORT_IWARP:
2548                 ret = cma_accept_iw(id_priv, conn_param);
2549                 break;
2550         default:
2551                 ret = -ENOSYS;
2552                 break;
2553         }
2554
2555         if (ret)
2556                 goto reject;
2557
2558         return 0;
2559 reject:
2560         cma_modify_qp_err(id_priv);
2561         rdma_reject(id, NULL, 0);
2562         return ret;
2563 }
2564 EXPORT_SYMBOL(rdma_accept);
2565
2566 int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event)
2567 {
2568         struct rdma_id_private *id_priv;
2569         int ret;
2570
2571         id_priv = container_of(id, struct rdma_id_private, id);
2572         if (!cma_has_cm_dev(id_priv))
2573                 return -EINVAL;
2574
2575         switch (id->device->node_type) {
2576         case RDMA_NODE_IB_CA:
2577                 ret = ib_cm_notify(id_priv->cm_id.ib, event);
2578                 break;
2579         default:
2580                 ret = 0;
2581                 break;
2582         }
2583         return ret;
2584 }
2585 EXPORT_SYMBOL(rdma_notify);
2586
2587 int rdma_reject(struct rdma_cm_id *id, const void *private_data,
2588                 u8 private_data_len)
2589 {
2590         struct rdma_id_private *id_priv;
2591         int ret;
2592
2593         id_priv = container_of(id, struct rdma_id_private, id);
2594         if (!cma_has_cm_dev(id_priv))
2595                 return -EINVAL;
2596
2597         switch (rdma_node_get_transport(id->device->node_type)) {
2598         case RDMA_TRANSPORT_IB:
2599                 if (cma_is_ud_ps(id->ps))
2600                         ret = cma_send_sidr_rep(id_priv, IB_SIDR_REJECT,
2601                                                 private_data, private_data_len);
2602                 else
2603                         ret = ib_send_cm_rej(id_priv->cm_id.ib,
2604                                              IB_CM_REJ_CONSUMER_DEFINED, NULL,
2605                                              0, private_data, private_data_len);
2606                 break;
2607         case RDMA_TRANSPORT_IWARP:
2608                 ret = iw_cm_reject(id_priv->cm_id.iw,
2609                                    private_data, private_data_len);
2610                 break;
2611         default:
2612                 ret = -ENOSYS;
2613                 break;
2614         }
2615         return ret;
2616 }
2617 EXPORT_SYMBOL(rdma_reject);
2618
2619 int rdma_disconnect(struct rdma_cm_id *id)
2620 {
2621         struct rdma_id_private *id_priv;
2622         int ret;
2623
2624         id_priv = container_of(id, struct rdma_id_private, id);
2625         if (!cma_has_cm_dev(id_priv))
2626                 return -EINVAL;
2627
2628         switch (rdma_node_get_transport(id->device->node_type)) {
2629         case RDMA_TRANSPORT_IB:
2630                 ret = cma_modify_qp_err(id_priv);
2631                 if (ret)
2632                         goto out;
2633                 /* Initiate or respond to a disconnect. */
2634                 if (ib_send_cm_dreq(id_priv->cm_id.ib, NULL, 0))
2635                         ib_send_cm_drep(id_priv->cm_id.ib, NULL, 0);
2636                 break;
2637         case RDMA_TRANSPORT_IWARP:
2638                 ret = iw_cm_disconnect(id_priv->cm_id.iw, 0);
2639                 break;
2640         default:
2641                 ret = -EINVAL;
2642                 break;
2643         }
2644 out:
2645         return ret;
2646 }
2647 EXPORT_SYMBOL(rdma_disconnect);
2648
2649 static int cma_ib_mc_handler(int status, struct ib_sa_multicast *multicast)
2650 {
2651         struct rdma_id_private *id_priv;
2652         struct cma_multicast *mc = multicast->context;
2653         struct rdma_cm_event event;
2654         int ret;
2655
2656         id_priv = mc->id_priv;
2657         if (cma_disable_callback(id_priv, CMA_ADDR_BOUND) &&
2658             cma_disable_callback(id_priv, CMA_ADDR_RESOLVED))
2659                 return 0;
2660
2661         mutex_lock(&id_priv->qp_mutex);
2662         if (!status && id_priv->id.qp)
2663                 status = ib_attach_mcast(id_priv->id.qp, &multicast->rec.mgid,
2664                                          multicast->rec.mlid);
2665         mutex_unlock(&id_priv->qp_mutex);
2666
2667         memset(&event, 0, sizeof event);
2668         event.status = status;
2669         event.param.ud.private_data = mc->context;
2670         if (!status) {
2671                 event.event = RDMA_CM_EVENT_MULTICAST_JOIN;
2672                 ib_init_ah_from_mcmember(id_priv->id.device,
2673                                          id_priv->id.port_num, &multicast->rec,
2674                                          &event.param.ud.ah_attr);
2675                 event.param.ud.qp_num = 0xFFFFFF;
2676                 event.param.ud.qkey = be32_to_cpu(multicast->rec.qkey);
2677         } else
2678                 event.event = RDMA_CM_EVENT_MULTICAST_ERROR;
2679
2680         ret = id_priv->id.event_handler(&id_priv->id, &event);
2681         if (ret) {
2682                 cma_exch(id_priv, CMA_DESTROYING);
2683                 mutex_unlock(&id_priv->handler_mutex);
2684                 rdma_destroy_id(&id_priv->id);
2685                 return 0;
2686         }
2687
2688         mutex_unlock(&id_priv->handler_mutex);
2689         return 0;
2690 }
2691
2692 static void cma_set_mgid(struct rdma_id_private *id_priv,
2693                          struct sockaddr *addr, union ib_gid *mgid)
2694 {
2695         unsigned char mc_map[MAX_ADDR_LEN];
2696         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
2697         struct sockaddr_in *sin = (struct sockaddr_in *) addr;
2698         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) addr;
2699
2700         if (cma_any_addr(addr)) {
2701                 memset(mgid, 0, sizeof *mgid);
2702         } else if ((addr->sa_family == AF_INET6) &&
2703                    ((be32_to_cpu(sin6->sin6_addr.s6_addr32[0]) & 0xFFF0FFFF) ==
2704                                                                  0xFF10A01B)) {
2705                 /* IPv6 address is an SA assigned MGID. */
2706                 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
2707         } else if ((addr->sa_family == AF_INET6)) {
2708                 ipv6_ib_mc_map(&sin6->sin6_addr, dev_addr->broadcast, mc_map);
2709                 if (id_priv->id.ps == RDMA_PS_UDP)
2710                         mc_map[7] = 0x01;       /* Use RDMA CM signature */
2711                 *mgid = *(union ib_gid *) (mc_map + 4);
2712         } else {
2713                 ip_ib_mc_map(sin->sin_addr.s_addr, dev_addr->broadcast, mc_map);
2714                 if (id_priv->id.ps == RDMA_PS_UDP)
2715                         mc_map[7] = 0x01;       /* Use RDMA CM signature */
2716                 *mgid = *(union ib_gid *) (mc_map + 4);
2717         }
2718 }
2719
2720 static int cma_join_ib_multicast(struct rdma_id_private *id_priv,
2721                                  struct cma_multicast *mc)
2722 {
2723         struct ib_sa_mcmember_rec rec;
2724         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
2725         ib_sa_comp_mask comp_mask;
2726         int ret;
2727
2728         ib_addr_get_mgid(dev_addr, &rec.mgid);
2729         ret = ib_sa_get_mcmember_rec(id_priv->id.device, id_priv->id.port_num,
2730                                      &rec.mgid, &rec);
2731         if (ret)
2732                 return ret;
2733
2734         cma_set_mgid(id_priv, (struct sockaddr *) &mc->addr, &rec.mgid);
2735         if (id_priv->id.ps == RDMA_PS_UDP)
2736                 rec.qkey = cpu_to_be32(RDMA_UDP_QKEY);
2737         rdma_addr_get_sgid(dev_addr, &rec.port_gid);
2738         rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
2739         rec.join_state = 1;
2740
2741         comp_mask = IB_SA_MCMEMBER_REC_MGID | IB_SA_MCMEMBER_REC_PORT_GID |
2742                     IB_SA_MCMEMBER_REC_PKEY | IB_SA_MCMEMBER_REC_JOIN_STATE |
2743                     IB_SA_MCMEMBER_REC_QKEY | IB_SA_MCMEMBER_REC_SL |
2744                     IB_SA_MCMEMBER_REC_FLOW_LABEL |
2745                     IB_SA_MCMEMBER_REC_TRAFFIC_CLASS;
2746
2747         if (id_priv->id.ps == RDMA_PS_IPOIB)
2748                 comp_mask |= IB_SA_MCMEMBER_REC_RATE |
2749                              IB_SA_MCMEMBER_REC_RATE_SELECTOR;
2750
2751         mc->multicast.ib = ib_sa_join_multicast(&sa_client, id_priv->id.device,
2752                                                 id_priv->id.port_num, &rec,
2753                                                 comp_mask, GFP_KERNEL,
2754                                                 cma_ib_mc_handler, mc);
2755         if (IS_ERR(mc->multicast.ib))
2756                 return PTR_ERR(mc->multicast.ib);
2757
2758         return 0;
2759 }
2760
2761 int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
2762                         void *context)
2763 {
2764         struct rdma_id_private *id_priv;
2765         struct cma_multicast *mc;
2766         int ret;
2767
2768         id_priv = container_of(id, struct rdma_id_private, id);
2769         if (!cma_comp(id_priv, CMA_ADDR_BOUND) &&
2770             !cma_comp(id_priv, CMA_ADDR_RESOLVED))
2771                 return -EINVAL;
2772
2773         mc = kmalloc(sizeof *mc, GFP_KERNEL);
2774         if (!mc)
2775                 return -ENOMEM;
2776
2777         memcpy(&mc->addr, addr, ip_addr_size(addr));
2778         mc->context = context;
2779         mc->id_priv = id_priv;
2780
2781         spin_lock(&id_priv->lock);
2782         list_add(&mc->list, &id_priv->mc_list);
2783         spin_unlock(&id_priv->lock);
2784
2785         switch (rdma_node_get_transport(id->device->node_type)) {
2786         case RDMA_TRANSPORT_IB:
2787                 ret = cma_join_ib_multicast(id_priv, mc);
2788                 break;
2789         default:
2790                 ret = -ENOSYS;
2791                 break;
2792         }
2793
2794         if (ret) {
2795                 spin_lock_irq(&id_priv->lock);
2796                 list_del(&mc->list);
2797                 spin_unlock_irq(&id_priv->lock);
2798                 kfree(mc);
2799         }
2800         return ret;
2801 }
2802 EXPORT_SYMBOL(rdma_join_multicast);
2803
2804 void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr)
2805 {
2806         struct rdma_id_private *id_priv;
2807         struct cma_multicast *mc;
2808
2809         id_priv = container_of(id, struct rdma_id_private, id);
2810         spin_lock_irq(&id_priv->lock);
2811         list_for_each_entry(mc, &id_priv->mc_list, list) {
2812                 if (!memcmp(&mc->addr, addr, ip_addr_size(addr))) {
2813                         list_del(&mc->list);
2814                         spin_unlock_irq(&id_priv->lock);
2815
2816                         if (id->qp)
2817                                 ib_detach_mcast(id->qp,
2818                                                 &mc->multicast.ib->rec.mgid,
2819                                                 mc->multicast.ib->rec.mlid);
2820                         ib_sa_free_multicast(mc->multicast.ib);
2821                         kfree(mc);
2822                         return;
2823                 }
2824         }
2825         spin_unlock_irq(&id_priv->lock);
2826 }
2827 EXPORT_SYMBOL(rdma_leave_multicast);
2828
2829 static int cma_netdev_change(struct net_device *ndev, struct rdma_id_private *id_priv)
2830 {
2831         struct rdma_dev_addr *dev_addr;
2832         struct cma_ndev_work *work;
2833
2834         dev_addr = &id_priv->id.route.addr.dev_addr;
2835
2836         if ((dev_addr->bound_dev_if == ndev->ifindex) &&
2837             memcmp(dev_addr->src_dev_addr, ndev->dev_addr, ndev->addr_len)) {
2838                 printk(KERN_INFO "RDMA CM addr change for ndev %s used by id %p\n",
2839                        ndev->name, &id_priv->id);
2840                 work = kzalloc(sizeof *work, GFP_KERNEL);
2841                 if (!work)
2842                         return -ENOMEM;
2843
2844                 INIT_WORK(&work->work, cma_ndev_work_handler);
2845                 work->id = id_priv;
2846                 work->event.event = RDMA_CM_EVENT_ADDR_CHANGE;
2847                 atomic_inc(&id_priv->refcount);
2848                 queue_work(cma_wq, &work->work);
2849         }
2850
2851         return 0;
2852 }
2853
2854 static int cma_netdev_callback(struct notifier_block *self, unsigned long event,
2855                                void *ctx)
2856 {
2857         struct net_device *ndev = (struct net_device *)ctx;
2858         struct cma_device *cma_dev;
2859         struct rdma_id_private *id_priv;
2860         int ret = NOTIFY_DONE;
2861
2862         if (dev_net(ndev) != &init_net)
2863                 return NOTIFY_DONE;
2864
2865         if (event != NETDEV_BONDING_FAILOVER)
2866                 return NOTIFY_DONE;
2867
2868         if (!(ndev->flags & IFF_MASTER) || !(ndev->priv_flags & IFF_BONDING))
2869                 return NOTIFY_DONE;
2870
2871         mutex_lock(&lock);
2872         list_for_each_entry(cma_dev, &dev_list, list)
2873                 list_for_each_entry(id_priv, &cma_dev->id_list, list) {
2874                         ret = cma_netdev_change(ndev, id_priv);
2875                         if (ret)
2876                                 goto out;
2877                 }
2878
2879 out:
2880         mutex_unlock(&lock);
2881         return ret;
2882 }
2883
2884 static struct notifier_block cma_nb = {
2885         .notifier_call = cma_netdev_callback
2886 };
2887
2888 static void cma_add_one(struct ib_device *device)
2889 {
2890         struct cma_device *cma_dev;
2891         struct rdma_id_private *id_priv;
2892
2893         cma_dev = kmalloc(sizeof *cma_dev, GFP_KERNEL);
2894         if (!cma_dev)
2895                 return;
2896
2897         cma_dev->device = device;
2898
2899         init_completion(&cma_dev->comp);
2900         atomic_set(&cma_dev->refcount, 1);
2901         INIT_LIST_HEAD(&cma_dev->id_list);
2902         ib_set_client_data(device, &cma_client, cma_dev);
2903
2904         mutex_lock(&lock);
2905         list_add_tail(&cma_dev->list, &dev_list);
2906         list_for_each_entry(id_priv, &listen_any_list, list)
2907                 cma_listen_on_dev(id_priv, cma_dev);
2908         mutex_unlock(&lock);
2909 }
2910
2911 static int cma_remove_id_dev(struct rdma_id_private *id_priv)
2912 {
2913         struct rdma_cm_event event;
2914         enum cma_state state;
2915         int ret = 0;
2916
2917         /* Record that we want to remove the device */
2918         state = cma_exch(id_priv, CMA_DEVICE_REMOVAL);
2919         if (state == CMA_DESTROYING)
2920                 return 0;
2921
2922         cma_cancel_operation(id_priv, state);
2923         mutex_lock(&id_priv->handler_mutex);
2924
2925         /* Check for destruction from another callback. */
2926         if (!cma_comp(id_priv, CMA_DEVICE_REMOVAL))
2927                 goto out;
2928
2929         memset(&event, 0, sizeof event);
2930         event.event = RDMA_CM_EVENT_DEVICE_REMOVAL;
2931         ret = id_priv->id.event_handler(&id_priv->id, &event);
2932 out:
2933         mutex_unlock(&id_priv->handler_mutex);
2934         return ret;
2935 }
2936
2937 static void cma_process_remove(struct cma_device *cma_dev)
2938 {
2939         struct rdma_id_private *id_priv;
2940         int ret;
2941
2942         mutex_lock(&lock);
2943         while (!list_empty(&cma_dev->id_list)) {
2944                 id_priv = list_entry(cma_dev->id_list.next,
2945                                      struct rdma_id_private, list);
2946
2947                 list_del(&id_priv->listen_list);
2948                 list_del_init(&id_priv->list);
2949                 atomic_inc(&id_priv->refcount);
2950                 mutex_unlock(&lock);
2951
2952                 ret = id_priv->internal_id ? 1 : cma_remove_id_dev(id_priv);
2953                 cma_deref_id(id_priv);
2954                 if (ret)
2955                         rdma_destroy_id(&id_priv->id);
2956
2957                 mutex_lock(&lock);
2958         }
2959         mutex_unlock(&lock);
2960
2961         cma_deref_dev(cma_dev);
2962         wait_for_completion(&cma_dev->comp);
2963 }
2964
2965 static void cma_remove_one(struct ib_device *device)
2966 {
2967         struct cma_device *cma_dev;
2968
2969         cma_dev = ib_get_client_data(device, &cma_client);
2970         if (!cma_dev)
2971                 return;
2972
2973         mutex_lock(&lock);
2974         list_del(&cma_dev->list);
2975         mutex_unlock(&lock);
2976
2977         cma_process_remove(cma_dev);
2978         kfree(cma_dev);
2979 }
2980
2981 static int __init cma_init(void)
2982 {
2983         int ret;
2984
2985         cma_wq = create_singlethread_workqueue("rdma_cm");
2986         if (!cma_wq)
2987                 return -ENOMEM;
2988
2989         ib_sa_register_client(&sa_client);
2990         rdma_addr_register_client(&addr_client);
2991         register_netdevice_notifier(&cma_nb);
2992
2993         ret = ib_register_client(&cma_client);
2994         if (ret)
2995                 goto err;
2996         return 0;
2997
2998 err:
2999         unregister_netdevice_notifier(&cma_nb);
3000         rdma_addr_unregister_client(&addr_client);
3001         ib_sa_unregister_client(&sa_client);
3002         destroy_workqueue(cma_wq);
3003         return ret;
3004 }
3005
3006 static void __exit cma_cleanup(void)
3007 {
3008         ib_unregister_client(&cma_client);
3009         unregister_netdevice_notifier(&cma_nb);
3010         rdma_addr_unregister_client(&addr_client);
3011         ib_sa_unregister_client(&sa_client);
3012         destroy_workqueue(cma_wq);
3013         idr_destroy(&sdp_ps);
3014         idr_destroy(&tcp_ps);
3015         idr_destroy(&udp_ps);
3016         idr_destroy(&ipoib_ps);
3017 }
3018
3019 module_init(cma_init);
3020 module_exit(cma_cleanup);