git.oblomov.eu Git - linux-2.6/blob - 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
  44 #include <net/tcp.h>
  45 #include <net/ipv6.h>
  46
  47 #include <rdma/rdma_cm.h>
  48 #include <rdma/rdma_cm_ib.h>
  49 #include <rdma/ib_cache.h>
  50 #include <rdma/ib_cm.h>
  51 #include <rdma/ib_sa.h>
  52 #include <rdma/iw_cm.h>
  53
  54 MODULE_AUTHOR("Sean Hefty");
  55 MODULE_DESCRIPTION("Generic RDMA CM Agent");
  56 MODULE_LICENSE("Dual BSD/GPL");
  57
  58 #define CMA_CM_RESPONSE_TIMEOUT 20
  59 #define CMA_MAX_CM_RETRIES 15
  60 #define CMA_CM_MRA_SETTING (IB_CM_MRA_FLAG_DELAY | 24)
  61
  62 static void cma_add_one(struct ib_device *device);
  63 static void cma_remove_one(struct ib_device *device);
  64
  65 static struct ib_client cma_client = {
  66         .name   = "cma",
  67         .add    = cma_add_one,
  68         .remove = cma_remove_one
  69 };
  70
  71 static struct ib_sa_client sa_client;
  72 static struct rdma_addr_client addr_client;
  73 static LIST_HEAD(dev_list);
  74 static LIST_HEAD(listen_any_list);
  75 static DEFINE_MUTEX(lock);
  76 static struct workqueue_struct *cma_wq;
  77 static DEFINE_IDR(sdp_ps);
  78 static DEFINE_IDR(tcp_ps);
  79 static DEFINE_IDR(udp_ps);
  80 static DEFINE_IDR(ipoib_ps);
  81 static int next_port;
  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 ib_device *device, u8 port_num,
 301                         enum rdma_port_space ps,
 302                         struct rdma_dev_addr *dev_addr, u32 *qkey)
 303 {
 304         struct ib_sa_mcmember_rec rec;
 305         int ret = 0;
 306
 307         switch (ps) {
 308         case RDMA_PS_UDP:
 309                 *qkey = RDMA_UDP_QKEY;
 310                 break;
 311         case RDMA_PS_IPOIB:
 312                 ib_addr_get_mgid(dev_addr, &rec.mgid);
 313                 ret = ib_sa_get_mcmember_rec(device, port_num, &rec.mgid, &rec);
 314                 *qkey = be32_to_cpu(rec.qkey);
 315                 break;
 316         default:
 317                 break;
 318         }
 319         return ret;
 320 }
 321
 322 static int cma_acquire_dev(struct rdma_id_private *id_priv)
 323 {
 324         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
 325         struct cma_device *cma_dev;
 326         union ib_gid gid;
 327         int ret = -ENODEV;
 328
 329         switch (rdma_node_get_transport(dev_addr->dev_type)) {
 330         case RDMA_TRANSPORT_IB:
 331                 ib_addr_get_sgid(dev_addr, &gid);
 332                 break;
 333         case RDMA_TRANSPORT_IWARP:
 334                 iw_addr_get_sgid(dev_addr, &gid);
 335                 break;
 336         default:
 337                 return -ENODEV;
 338         }
 339
 340         list_for_each_entry(cma_dev, &dev_list, list) {
 341                 ret = ib_find_cached_gid(cma_dev->device, &gid,
 342                                          &id_priv->id.port_num, NULL);
 343                 if (!ret) {
 344                         ret = cma_set_qkey(cma_dev->device,
 345                                            id_priv->id.port_num,
 346                                            id_priv->id.ps, dev_addr,
 347                                            &id_priv->qkey);
 348                         if (!ret)
 349                                 cma_attach_to_dev(id_priv, cma_dev);
 350                         break;
 351                 }
 352         }
 353         return ret;
 354 }
 355
 356 static void cma_deref_id(struct rdma_id_private *id_priv)
 357 {
 358         if (atomic_dec_and_test(&id_priv->refcount))
 359                 complete(&id_priv->comp);
 360 }
 361
 362 static int cma_disable_callback(struct rdma_id_private *id_priv,
 363                               enum cma_state state)
 364 {
 365         mutex_lock(&id_priv->handler_mutex);
 366         if (id_priv->state != state) {
 367                 mutex_unlock(&id_priv->handler_mutex);
 368                 return -EINVAL;
 369         }
 370         return 0;
 371 }
 372
 373 static int cma_has_cm_dev(struct rdma_id_private *id_priv)
 374 {
 375         return (id_priv->id.device && id_priv->cm_id.ib);
 376 }
 377
 378 struct rdma_cm_id *rdma_create_id(rdma_cm_event_handler event_handler,
 379                                   void *context, enum rdma_port_space ps)
 380 {
 381         struct rdma_id_private *id_priv;
 382
 383         id_priv = kzalloc(sizeof *id_priv, GFP_KERNEL);
 384         if (!id_priv)
 385                 return ERR_PTR(-ENOMEM);
 386
 387         id_priv->state = CMA_IDLE;
 388         id_priv->id.context = context;
 389         id_priv->id.event_handler = event_handler;
 390         id_priv->id.ps = ps;
 391         spin_lock_init(&id_priv->lock);
 392         mutex_init(&id_priv->qp_mutex);
 393         init_completion(&id_priv->comp);
 394         atomic_set(&id_priv->refcount, 1);
 395         mutex_init(&id_priv->handler_mutex);
 396         INIT_LIST_HEAD(&id_priv->listen_list);
 397         INIT_LIST_HEAD(&id_priv->mc_list);
 398         get_random_bytes(&id_priv->seq_num, sizeof id_priv->seq_num);
 399
 400         return &id_priv->id;
 401 }
 402 EXPORT_SYMBOL(rdma_create_id);
 403
 404 static int cma_init_ud_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
 405 {
 406         struct ib_qp_attr qp_attr;
 407         int qp_attr_mask, ret;
 408
 409         qp_attr.qp_state = IB_QPS_INIT;
 410         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 411         if (ret)
 412                 return ret;
 413
 414         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 415         if (ret)
 416                 return ret;
 417
 418         qp_attr.qp_state = IB_QPS_RTR;
 419         ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
 420         if (ret)
 421                 return ret;
 422
 423         qp_attr.qp_state = IB_QPS_RTS;
 424         qp_attr.sq_psn = 0;
 425         ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE | IB_QP_SQ_PSN);
 426
 427         return ret;
 428 }
 429
 430 static int cma_init_conn_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
 431 {
 432         struct ib_qp_attr qp_attr;
 433         int qp_attr_mask, ret;
 434
 435         qp_attr.qp_state = IB_QPS_INIT;
 436         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 437         if (ret)
 438                 return ret;
 439
 440         return ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 441 }
 442
 443 int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
 444                    struct ib_qp_init_attr *qp_init_attr)
 445 {
 446         struct rdma_id_private *id_priv;
 447         struct ib_qp *qp;
 448         int ret;
 449
 450         id_priv = container_of(id, struct rdma_id_private, id);
 451         if (id->device != pd->device)
 452                 return -EINVAL;
 453
 454         qp = ib_create_qp(pd, qp_init_attr);
 455         if (IS_ERR(qp))
 456                 return PTR_ERR(qp);
 457
 458         if (cma_is_ud_ps(id_priv->id.ps))
 459                 ret = cma_init_ud_qp(id_priv, qp);
 460         else
 461                 ret = cma_init_conn_qp(id_priv, qp);
 462         if (ret)
 463                 goto err;
 464
 465         id->qp = qp;
 466         id_priv->qp_num = qp->qp_num;
 467         id_priv->srq = (qp->srq != NULL);
 468         return 0;
 469 err:
 470         ib_destroy_qp(qp);
 471         return ret;
 472 }
 473 EXPORT_SYMBOL(rdma_create_qp);
 474
 475 void rdma_destroy_qp(struct rdma_cm_id *id)
 476 {
 477         struct rdma_id_private *id_priv;
 478
 479         id_priv = container_of(id, struct rdma_id_private, id);
 480         mutex_lock(&id_priv->qp_mutex);
 481         ib_destroy_qp(id_priv->id.qp);
 482         id_priv->id.qp = NULL;
 483         mutex_unlock(&id_priv->qp_mutex);
 484 }
 485 EXPORT_SYMBOL(rdma_destroy_qp);
 486
 487 static int cma_modify_qp_rtr(struct rdma_id_private *id_priv,
 488                              struct rdma_conn_param *conn_param)
 489 {
 490         struct ib_qp_attr qp_attr;
 491         int qp_attr_mask, ret;
 492
 493         mutex_lock(&id_priv->qp_mutex);
 494         if (!id_priv->id.qp) {
 495                 ret = 0;
 496                 goto out;
 497         }
 498
 499         /* Need to update QP attributes from default values. */
 500         qp_attr.qp_state = IB_QPS_INIT;
 501         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 502         if (ret)
 503                 goto out;
 504
 505         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
 506         if (ret)
 507                 goto out;
 508
 509         qp_attr.qp_state = IB_QPS_RTR;
 510         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 511         if (ret)
 512                 goto out;
 513
 514         if (conn_param)
 515                 qp_attr.max_dest_rd_atomic = conn_param->responder_resources;
 516         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
 517 out:
 518         mutex_unlock(&id_priv->qp_mutex);
 519         return ret;
 520 }
 521
 522 static int cma_modify_qp_rts(struct rdma_id_private *id_priv,
 523                              struct rdma_conn_param *conn_param)
 524 {
 525         struct ib_qp_attr qp_attr;
 526         int qp_attr_mask, ret;
 527
 528         mutex_lock(&id_priv->qp_mutex);
 529         if (!id_priv->id.qp) {
 530                 ret = 0;
 531                 goto out;
 532         }
 533
 534         qp_attr.qp_state = IB_QPS_RTS;
 535         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 536         if (ret)
 537                 goto out;
 538
 539         if (conn_param)
 540                 qp_attr.max_rd_atomic = conn_param->initiator_depth;
 541         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
 542 out:
 543         mutex_unlock(&id_priv->qp_mutex);
 544         return ret;
 545 }
 546
 547 static int cma_modify_qp_err(struct rdma_id_private *id_priv)
 548 {
 549         struct ib_qp_attr qp_attr;
 550         int ret;
 551
 552         mutex_lock(&id_priv->qp_mutex);
 553         if (!id_priv->id.qp) {
 554                 ret = 0;
 555                 goto out;
 556         }
 557
 558         qp_attr.qp_state = IB_QPS_ERR;
 559         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, IB_QP_STATE);
 560 out:
 561         mutex_unlock(&id_priv->qp_mutex);
 562         return ret;
 563 }
 564
 565 static int cma_ib_init_qp_attr(struct rdma_id_private *id_priv,
 566                                struct ib_qp_attr *qp_attr, int *qp_attr_mask)
 567 {
 568         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
 569         int ret;
 570
 571         ret = ib_find_cached_pkey(id_priv->id.device, id_priv->id.port_num,
 572                                   ib_addr_get_pkey(dev_addr),
 573                                   &qp_attr->pkey_index);
 574         if (ret)
 575                 return ret;
 576
 577         qp_attr->port_num = id_priv->id.port_num;
 578         *qp_attr_mask = IB_QP_STATE | IB_QP_PKEY_INDEX | IB_QP_PORT;
 579
 580         if (cma_is_ud_ps(id_priv->id.ps)) {
 581                 qp_attr->qkey = id_priv->qkey;
 582                 *qp_attr_mask |= IB_QP_QKEY;
 583         } else {
 584                 qp_attr->qp_access_flags = 0;
 585                 *qp_attr_mask |= IB_QP_ACCESS_FLAGS;
 586         }
 587         return 0;
 588 }
 589
 590 int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
 591                        int *qp_attr_mask)
 592 {
 593         struct rdma_id_private *id_priv;
 594         int ret = 0;
 595
 596         id_priv = container_of(id, struct rdma_id_private, id);
 597         switch (rdma_node_get_transport(id_priv->id.device->node_type)) {
 598         case RDMA_TRANSPORT_IB:
 599                 if (!id_priv->cm_id.ib || cma_is_ud_ps(id_priv->id.ps))
 600                         ret = cma_ib_init_qp_attr(id_priv, qp_attr, qp_attr_mask);
 601                 else
 602                         ret = ib_cm_init_qp_attr(id_priv->cm_id.ib, qp_attr,
 603                                                  qp_attr_mask);
 604                 if (qp_attr->qp_state == IB_QPS_RTR)
 605                         qp_attr->rq_psn = id_priv->seq_num;
 606                 break;
 607         case RDMA_TRANSPORT_IWARP:
 608                 if (!id_priv->cm_id.iw) {
 609                         qp_attr->qp_access_flags = 0;
 610                         *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS;
 611                 } else
 612                         ret = iw_cm_init_qp_attr(id_priv->cm_id.iw, qp_attr,
 613                                                  qp_attr_mask);
 614                 break;
 615         default:
 616                 ret = -ENOSYS;
 617                 break;
 618         }
 619
 620         return ret;
 621 }
 622 EXPORT_SYMBOL(rdma_init_qp_attr);
 623
 624 static inline int cma_zero_addr(struct sockaddr *addr)
 625 {
 626         struct in6_addr *ip6;
 627
 628         if (addr->sa_family == AF_INET)
 629                 return ipv4_is_zeronet(
 630                         ((struct sockaddr_in *)addr)->sin_addr.s_addr);
 631         else {
 632                 ip6 = &((struct sockaddr_in6 *) addr)->sin6_addr;
 633                 return (ip6->s6_addr32[0] | ip6->s6_addr32[1] |
 634                         ip6->s6_addr32[2] | ip6->s6_addr32[3]) == 0;
 635         }
 636 }
 637
 638 static inline int cma_loopback_addr(struct sockaddr *addr)
 639 {
 640         if (addr->sa_family == AF_INET)
 641                 return ipv4_is_loopback(
 642                         ((struct sockaddr_in *) addr)->sin_addr.s_addr);
 643         else
 644                 return ipv6_addr_loopback(
 645                         &((struct sockaddr_in6 *) addr)->sin6_addr);
 646 }
 647
 648 static inline int cma_any_addr(struct sockaddr *addr)
 649 {
 650         return cma_zero_addr(addr) || cma_loopback_addr(addr);
 651 }
 652
 653 static inline __be16 cma_port(struct sockaddr *addr)
 654 {
 655         if (addr->sa_family == AF_INET)
 656                 return ((struct sockaddr_in *) addr)->sin_port;
 657         else
 658                 return ((struct sockaddr_in6 *) addr)->sin6_port;
 659 }
 660
 661 static inline int cma_any_port(struct sockaddr *addr)
 662 {
 663         return !cma_port(addr);
 664 }
 665
 666 static int cma_get_net_info(void *hdr, enum rdma_port_space ps,
 667                             u8 *ip_ver, __be16 *port,
 668                             union cma_ip_addr **src, union cma_ip_addr **dst)
 669 {
 670         switch (ps) {
 671         case RDMA_PS_SDP:
 672                 if (sdp_get_majv(((struct sdp_hh *) hdr)->sdp_version) !=
 673                     SDP_MAJ_VERSION)
 674                         return -EINVAL;
 675
 676                 *ip_ver = sdp_get_ip_ver(hdr);
 677                 *port   = ((struct sdp_hh *) hdr)->port;
 678                 *src    = &((struct sdp_hh *) hdr)->src_addr;
 679                 *dst    = &((struct sdp_hh *) hdr)->dst_addr;
 680                 break;
 681         default:
 682                 if (((struct cma_hdr *) hdr)->cma_version != CMA_VERSION)
 683                         return -EINVAL;
 684
 685                 *ip_ver = cma_get_ip_ver(hdr);
 686                 *port   = ((struct cma_hdr *) hdr)->port;
 687                 *src    = &((struct cma_hdr *) hdr)->src_addr;
 688                 *dst    = &((struct cma_hdr *) hdr)->dst_addr;
 689                 break;
 690         }
 691
 692         if (*ip_ver != 4 && *ip_ver != 6)
 693                 return -EINVAL;
 694         return 0;
 695 }
 696
 697 static void cma_save_net_info(struct rdma_addr *addr,
 698                               struct rdma_addr *listen_addr,
 699                               u8 ip_ver, __be16 port,
 700                               union cma_ip_addr *src, union cma_ip_addr *dst)
 701 {
 702         struct sockaddr_in *listen4, *ip4;
 703         struct sockaddr_in6 *listen6, *ip6;
 704
 705         switch (ip_ver) {
 706         case 4:
 707                 listen4 = (struct sockaddr_in *) &listen_addr->src_addr;
 708                 ip4 = (struct sockaddr_in *) &addr->src_addr;
 709                 ip4->sin_family = listen4->sin_family;
 710                 ip4->sin_addr.s_addr = dst->ip4.addr;
 711                 ip4->sin_port = listen4->sin_port;
 712
 713                 ip4 = (struct sockaddr_in *) &addr->dst_addr;
 714                 ip4->sin_family = listen4->sin_family;
 715                 ip4->sin_addr.s_addr = src->ip4.addr;
 716                 ip4->sin_port = port;
 717                 break;
 718         case 6:
 719                 listen6 = (struct sockaddr_in6 *) &listen_addr->src_addr;
 720                 ip6 = (struct sockaddr_in6 *) &addr->src_addr;
 721                 ip6->sin6_family = listen6->sin6_family;
 722                 ip6->sin6_addr = dst->ip6;
 723                 ip6->sin6_port = listen6->sin6_port;
 724
 725                 ip6 = (struct sockaddr_in6 *) &addr->dst_addr;
 726                 ip6->sin6_family = listen6->sin6_family;
 727                 ip6->sin6_addr = src->ip6;
 728                 ip6->sin6_port = port;
 729                 break;
 730         default:
 731                 break;
 732         }
 733 }
 734
 735 static inline int cma_user_data_offset(enum rdma_port_space ps)
 736 {
 737         switch (ps) {
 738         case RDMA_PS_SDP:
 739                 return 0;
 740         default:
 741                 return sizeof(struct cma_hdr);
 742         }
 743 }
 744
 745 static void cma_cancel_route(struct rdma_id_private *id_priv)
 746 {
 747         switch (rdma_node_get_transport(id_priv->id.device->node_type)) {
 748         case RDMA_TRANSPORT_IB:
 749                 if (id_priv->query)
 750                         ib_sa_cancel_query(id_priv->query_id, id_priv->query);
 751                 break;
 752         default:
 753                 break;
 754         }
 755 }
 756
 757 static void cma_cancel_listens(struct rdma_id_private *id_priv)
 758 {
 759         struct rdma_id_private *dev_id_priv;
 760
 761         /*
 762          * Remove from listen_any_list to prevent added devices from spawning
 763          * additional listen requests.
 764          */
 765         mutex_lock(&lock);
 766         list_del(&id_priv->list);
 767
 768         while (!list_empty(&id_priv->listen_list)) {
 769                 dev_id_priv = list_entry(id_priv->listen_list.next,
 770                                          struct rdma_id_private, listen_list);
 771                 /* sync with device removal to avoid duplicate destruction */
 772                 list_del_init(&dev_id_priv->list);
 773                 list_del(&dev_id_priv->listen_list);
 774                 mutex_unlock(&lock);
 775
 776                 rdma_destroy_id(&dev_id_priv->id);
 777                 mutex_lock(&lock);
 778         }
 779         mutex_unlock(&lock);
 780 }
 781
 782 static void cma_cancel_operation(struct rdma_id_private *id_priv,
 783                                  enum cma_state state)
 784 {
 785         switch (state) {
 786         case CMA_ADDR_QUERY:
 787                 rdma_addr_cancel(&id_priv->id.route.addr.dev_addr);
 788                 break;
 789         case CMA_ROUTE_QUERY:
 790                 cma_cancel_route(id_priv);
 791                 break;
 792         case CMA_LISTEN:
 793                 if (cma_any_addr((struct sockaddr *) &id_priv->id.route.addr.src_addr)
 794                                 && !id_priv->cma_dev)
 795                         cma_cancel_listens(id_priv);
 796                 break;
 797         default:
 798                 break;
 799         }
 800 }
 801
 802 static void cma_release_port(struct rdma_id_private *id_priv)
 803 {
 804         struct rdma_bind_list *bind_list = id_priv->bind_list;
 805
 806         if (!bind_list)
 807                 return;
 808
 809         mutex_lock(&lock);
 810         hlist_del(&id_priv->node);
 811         if (hlist_empty(&bind_list->owners)) {
 812                 idr_remove(bind_list->ps, bind_list->port);
 813                 kfree(bind_list);
 814         }
 815         mutex_unlock(&lock);
 816 }
 817
 818 static void cma_leave_mc_groups(struct rdma_id_private *id_priv)
 819 {
 820         struct cma_multicast *mc;
 821
 822         while (!list_empty(&id_priv->mc_list)) {
 823                 mc = container_of(id_priv->mc_list.next,
 824                                   struct cma_multicast, list);
 825                 list_del(&mc->list);
 826                 ib_sa_free_multicast(mc->multicast.ib);
 827                 kfree(mc);
 828         }
 829 }
 830
 831 void rdma_destroy_id(struct rdma_cm_id *id)
 832 {
 833         struct rdma_id_private *id_priv;
 834         enum cma_state state;
 835
 836         id_priv = container_of(id, struct rdma_id_private, id);
 837         state = cma_exch(id_priv, CMA_DESTROYING);
 838         cma_cancel_operation(id_priv, state);
 839
 840         mutex_lock(&lock);
 841         if (id_priv->cma_dev) {
 842                 mutex_unlock(&lock);
 843                 switch (rdma_node_get_transport(id->device->node_type)) {
 844                 case RDMA_TRANSPORT_IB:
 845                         if (id_priv->cm_id.ib && !IS_ERR(id_priv->cm_id.ib))
 846                                 ib_destroy_cm_id(id_priv->cm_id.ib);
 847                         break;
 848                 case RDMA_TRANSPORT_IWARP:
 849                         if (id_priv->cm_id.iw && !IS_ERR(id_priv->cm_id.iw))
 850                                 iw_destroy_cm_id(id_priv->cm_id.iw);
 851                         break;
 852                 default:
 853                         break;
 854                 }
 855                 cma_leave_mc_groups(id_priv);
 856                 mutex_lock(&lock);
 857                 cma_detach_from_dev(id_priv);
 858         }
 859         mutex_unlock(&lock);
 860
 861         cma_release_port(id_priv);
 862         cma_deref_id(id_priv);
 863         wait_for_completion(&id_priv->comp);
 864
 865         if (id_priv->internal_id)
 866                 cma_deref_id(id_priv->id.context);
 867
 868         kfree(id_priv->id.route.path_rec);
 869         kfree(id_priv);
 870 }
 871 EXPORT_SYMBOL(rdma_destroy_id);
 872
 873 static int cma_rep_recv(struct rdma_id_private *id_priv)
 874 {
 875         int ret;
 876
 877         ret = cma_modify_qp_rtr(id_priv, NULL);
 878         if (ret)
 879                 goto reject;
 880
 881         ret = cma_modify_qp_rts(id_priv, NULL);
 882         if (ret)
 883                 goto reject;
 884
 885         ret = ib_send_cm_rtu(id_priv->cm_id.ib, NULL, 0);
 886         if (ret)
 887                 goto reject;
 888
 889         return 0;
 890 reject:
 891         cma_modify_qp_err(id_priv);
 892         ib_send_cm_rej(id_priv->cm_id.ib, IB_CM_REJ_CONSUMER_DEFINED,
 893                        NULL, 0, NULL, 0);
 894         return ret;
 895 }
 896
 897 static int cma_verify_rep(struct rdma_id_private *id_priv, void *data)
 898 {
 899         if (id_priv->id.ps == RDMA_PS_SDP &&
 900             sdp_get_majv(((struct sdp_hah *) data)->sdp_version) !=
 901             SDP_MAJ_VERSION)
 902                 return -EINVAL;
 903
 904         return 0;
 905 }
 906
 907 static void cma_set_rep_event_data(struct rdma_cm_event *event,
 908                                    struct ib_cm_rep_event_param *rep_data,
 909                                    void *private_data)
 910 {
 911         event->param.conn.private_data = private_data;
 912         event->param.conn.private_data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
 913         event->param.conn.responder_resources = rep_data->responder_resources;
 914         event->param.conn.initiator_depth = rep_data->initiator_depth;
 915         event->param.conn.flow_control = rep_data->flow_control;
 916         event->param.conn.rnr_retry_count = rep_data->rnr_retry_count;
 917         event->param.conn.srq = rep_data->srq;
 918         event->param.conn.qp_num = rep_data->remote_qpn;
 919 }
 920
 921 static int cma_ib_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
 922 {
 923         struct rdma_id_private *id_priv = cm_id->context;
 924         struct rdma_cm_event event;
 925         int ret = 0;
 926
 927         if ((ib_event->event != IB_CM_TIMEWAIT_EXIT &&
 928                 cma_disable_callback(id_priv, CMA_CONNECT)) ||
 929             (ib_event->event == IB_CM_TIMEWAIT_EXIT &&
 930                 cma_disable_callback(id_priv, CMA_DISCONNECT)))
 931                 return 0;
 932
 933         memset(&event, 0, sizeof event);
 934         switch (ib_event->event) {
 935         case IB_CM_REQ_ERROR:
 936         case IB_CM_REP_ERROR:
 937                 event.event = RDMA_CM_EVENT_UNREACHABLE;
 938                 event.status = -ETIMEDOUT;
 939                 break;
 940         case IB_CM_REP_RECEIVED:
 941                 event.status = cma_verify_rep(id_priv, ib_event->private_data);
 942                 if (event.status)
 943                         event.event = RDMA_CM_EVENT_CONNECT_ERROR;
 944                 else if (id_priv->id.qp && id_priv->id.ps != RDMA_PS_SDP) {
 945                         event.status = cma_rep_recv(id_priv);
 946                         event.event = event.status ? RDMA_CM_EVENT_CONNECT_ERROR :
 947                                                      RDMA_CM_EVENT_ESTABLISHED;
 948                 } else
 949                         event.event = RDMA_CM_EVENT_CONNECT_RESPONSE;
 950                 cma_set_rep_event_data(&event, &ib_event->param.rep_rcvd,
 951                                        ib_event->private_data);
 952                 break;
 953         case IB_CM_RTU_RECEIVED:
 954         case IB_CM_USER_ESTABLISHED:
 955                 event.event = RDMA_CM_EVENT_ESTABLISHED;
 956                 break;
 957         case IB_CM_DREQ_ERROR:
 958                 event.status = -ETIMEDOUT; /* fall through */
 959         case IB_CM_DREQ_RECEIVED:
 960         case IB_CM_DREP_RECEIVED:
 961                 if (!cma_comp_exch(id_priv, CMA_CONNECT, CMA_DISCONNECT))
 962                         goto out;
 963                 event.event = RDMA_CM_EVENT_DISCONNECTED;
 964                 break;
 965         case IB_CM_TIMEWAIT_EXIT:
 966                 event.event = RDMA_CM_EVENT_TIMEWAIT_EXIT;
 967                 break;
 968         case IB_CM_MRA_RECEIVED:
 969                 /* ignore event */
 970                 goto out;
 971         case IB_CM_REJ_RECEIVED:
 972                 cma_modify_qp_err(id_priv);
 973                 event.status = ib_event->param.rej_rcvd.reason;
 974                 event.event = RDMA_CM_EVENT_REJECTED;
 975                 event.param.conn.private_data = ib_event->private_data;
 976                 event.param.conn.private_data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
 977                 break;
 978         default:
 979                 printk(KERN_ERR "RDMA CMA: unexpected IB CM event: %d\n",
 980                        ib_event->event);
 981                 goto out;
 982         }
 983
 984         ret = id_priv->id.event_handler(&id_priv->id, &event);
 985         if (ret) {
 986                 /* Destroy the CM ID by returning a non-zero value. */
 987                 id_priv->cm_id.ib = NULL;
 988                 cma_exch(id_priv, CMA_DESTROYING);
 989                 mutex_unlock(&id_priv->handler_mutex);
 990                 rdma_destroy_id(&id_priv->id);
 991                 return ret;
 992         }
 993 out:
 994         mutex_unlock(&id_priv->handler_mutex);
 995         return ret;
 996 }
 997
 998 static struct rdma_id_private *cma_new_conn_id(struct rdma_cm_id *listen_id,
 999                                                struct ib_cm_event *ib_event)
1000 {
1001         struct rdma_id_private *id_priv;
1002         struct rdma_cm_id *id;
1003         struct rdma_route *rt;
1004         union cma_ip_addr *src, *dst;
1005         __be16 port;
1006         u8 ip_ver;
1007         int ret;
1008
1009         if (cma_get_net_info(ib_event->private_data, listen_id->ps,
1010                              &ip_ver, &port, &src, &dst))
1011                 goto err;
1012
1013         id = rdma_create_id(listen_id->event_handler, listen_id->context,
1014                             listen_id->ps);
1015         if (IS_ERR(id))
1016                 goto err;
1017
1018         cma_save_net_info(&id->route.addr, &listen_id->route.addr,
1019                           ip_ver, port, src, dst);
1020
1021         rt = &id->route;
1022         rt->num_paths = ib_event->param.req_rcvd.alternate_path ? 2 : 1;
1023         rt->path_rec = kmalloc(sizeof *rt->path_rec * rt->num_paths,
1024                                GFP_KERNEL);
1025         if (!rt->path_rec)
1026                 goto destroy_id;
1027
1028         rt->path_rec[0] = *ib_event->param.req_rcvd.primary_path;
1029         if (rt->num_paths == 2)
1030                 rt->path_rec[1] = *ib_event->param.req_rcvd.alternate_path;
1031
1032         ib_addr_set_dgid(&rt->addr.dev_addr, &rt->path_rec[0].dgid);
1033         ret = rdma_translate_ip((struct sockaddr *) &id->route.addr.src_addr,
1034                                 &id->route.addr.dev_addr);
1035         if (ret)
1036                 goto destroy_id;
1037
1038         id_priv = container_of(id, struct rdma_id_private, id);
1039         id_priv->state = CMA_CONNECT;
1040         return id_priv;
1041
1042 destroy_id:
1043         rdma_destroy_id(id);
1044 err:
1045         return NULL;
1046 }
1047
1048 static struct rdma_id_private *cma_new_udp_id(struct rdma_cm_id *listen_id,
1049                                               struct ib_cm_event *ib_event)
1050 {
1051         struct rdma_id_private *id_priv;
1052         struct rdma_cm_id *id;
1053         union cma_ip_addr *src, *dst;
1054         __be16 port;
1055         u8 ip_ver;
1056         int ret;
1057
1058         id = rdma_create_id(listen_id->event_handler, listen_id->context,
1059                             listen_id->ps);
1060         if (IS_ERR(id))
1061                 return NULL;
1062
1063
1064         if (cma_get_net_info(ib_event->private_data, listen_id->ps,
1065                              &ip_ver, &port, &src, &dst))
1066                 goto err;
1067
1068         cma_save_net_info(&id->route.addr, &listen_id->route.addr,
1069                           ip_ver, port, src, dst);
1070
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         id_priv = container_of(id, struct rdma_id_private, id);
1077         id_priv->state = CMA_CONNECT;
1078         return id_priv;
1079 err:
1080         rdma_destroy_id(id);
1081         return NULL;
1082 }
1083
1084 static void cma_set_req_event_data(struct rdma_cm_event *event,
1085                                    struct ib_cm_req_event_param *req_data,
1086                                    void *private_data, int offset)
1087 {
1088         event->param.conn.private_data = private_data + offset;
1089         event->param.conn.private_data_len = IB_CM_REQ_PRIVATE_DATA_SIZE - offset;
1090         event->param.conn.responder_resources = req_data->responder_resources;
1091         event->param.conn.initiator_depth = req_data->initiator_depth;
1092         event->param.conn.flow_control = req_data->flow_control;
1093         event->param.conn.retry_count = req_data->retry_count;
1094         event->param.conn.rnr_retry_count = req_data->rnr_retry_count;
1095         event->param.conn.srq = req_data->srq;
1096         event->param.conn.qp_num = req_data->remote_qpn;
1097 }
1098
1099 static int cma_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
1100 {
1101         struct rdma_id_private *listen_id, *conn_id;
1102         struct rdma_cm_event event;
1103         int offset, ret;
1104
1105         listen_id = cm_id->context;
1106         if (cma_disable_callback(listen_id, CMA_LISTEN))
1107                 return -ECONNABORTED;
1108
1109         memset(&event, 0, sizeof event);
1110         offset = cma_user_data_offset(listen_id->id.ps);
1111         event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
1112         if (cma_is_ud_ps(listen_id->id.ps)) {
1113                 conn_id = cma_new_udp_id(&listen_id->id, ib_event);
1114                 event.param.ud.private_data = ib_event->private_data + offset;
1115                 event.param.ud.private_data_len =
1116                                 IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE - offset;
1117         } else {
1118                 conn_id = cma_new_conn_id(&listen_id->id, ib_event);
1119                 cma_set_req_event_data(&event, &ib_event->param.req_rcvd,
1120                                        ib_event->private_data, offset);
1121         }
1122         if (!conn_id) {
1123                 ret = -ENOMEM;
1124                 goto out;
1125         }
1126
1127         mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
1128         mutex_lock(&lock);
1129         ret = cma_acquire_dev(conn_id);
1130         mutex_unlock(&lock);
1131         if (ret)
1132                 goto release_conn_id;
1133
1134         conn_id->cm_id.ib = cm_id;
1135         cm_id->context = conn_id;
1136         cm_id->cm_handler = cma_ib_handler;
1137
1138         ret = conn_id->id.event_handler(&conn_id->id, &event);
1139         if (!ret) {
1140                 /*
1141                  * Acquire mutex to prevent user executing rdma_destroy_id()
1142                  * while we're accessing the cm_id.
1143                  */
1144                 mutex_lock(&lock);
1145                 if (cma_comp(conn_id, CMA_CONNECT) &&
1146                     !cma_is_ud_ps(conn_id->id.ps))
1147                         ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
1148                 mutex_unlock(&lock);
1149                 mutex_unlock(&conn_id->handler_mutex);
1150                 goto out;
1151         }
1152
1153         /* Destroy the CM ID by returning a non-zero value. */
1154         conn_id->cm_id.ib = NULL;
1155
1156 release_conn_id:
1157         cma_exch(conn_id, CMA_DESTROYING);
1158         mutex_unlock(&conn_id->handler_mutex);
1159         rdma_destroy_id(&conn_id->id);
1160
1161 out:
1162         mutex_unlock(&listen_id->handler_mutex);
1163         return ret;
1164 }
1165
1166 static __be64 cma_get_service_id(enum rdma_port_space ps, struct sockaddr *addr)
1167 {
1168         return cpu_to_be64(((u64)ps << 16) + be16_to_cpu(cma_port(addr)));
1169 }
1170
1171 static void cma_set_compare_data(enum rdma_port_space ps, struct sockaddr *addr,
1172                                  struct ib_cm_compare_data *compare)
1173 {
1174         struct cma_hdr *cma_data, *cma_mask;
1175         struct sdp_hh *sdp_data, *sdp_mask;
1176         __be32 ip4_addr;
1177         struct in6_addr ip6_addr;
1178
1179         memset(compare, 0, sizeof *compare);
1180         cma_data = (void *) compare->data;
1181         cma_mask = (void *) compare->mask;
1182         sdp_data = (void *) compare->data;
1183         sdp_mask = (void *) compare->mask;
1184
1185         switch (addr->sa_family) {
1186         case AF_INET:
1187                 ip4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
1188                 if (ps == RDMA_PS_SDP) {
1189                         sdp_set_ip_ver(sdp_data, 4);
1190                         sdp_set_ip_ver(sdp_mask, 0xF);
1191                         sdp_data->dst_addr.ip4.addr = ip4_addr;
1192                         sdp_mask->dst_addr.ip4.addr = htonl(~0);
1193                 } else {
1194                         cma_set_ip_ver(cma_data, 4);
1195                         cma_set_ip_ver(cma_mask, 0xF);
1196                         cma_data->dst_addr.ip4.addr = ip4_addr;
1197                         cma_mask->dst_addr.ip4.addr = htonl(~0);
1198                 }
1199                 break;
1200         case AF_INET6:
1201                 ip6_addr = ((struct sockaddr_in6 *) addr)->sin6_addr;
1202                 if (ps == RDMA_PS_SDP) {
1203                         sdp_set_ip_ver(sdp_data, 6);
1204                         sdp_set_ip_ver(sdp_mask, 0xF);
1205                         sdp_data->dst_addr.ip6 = ip6_addr;
1206                         memset(&sdp_mask->dst_addr.ip6, 0xFF,
1207                                sizeof sdp_mask->dst_addr.ip6);
1208                 } else {
1209                         cma_set_ip_ver(cma_data, 6);
1210                         cma_set_ip_ver(cma_mask, 0xF);
1211                         cma_data->dst_addr.ip6 = ip6_addr;
1212                         memset(&cma_mask->dst_addr.ip6, 0xFF,
1213                                sizeof cma_mask->dst_addr.ip6);
1214                 }
1215                 break;
1216         default:
1217                 break;
1218         }
1219 }
1220
1221 static int cma_iw_handler(struct iw_cm_id *iw_id, struct iw_cm_event *iw_event)
1222 {
1223         struct rdma_id_private *id_priv = iw_id->context;
1224         struct rdma_cm_event event;
1225         struct sockaddr_in *sin;
1226         int ret = 0;
1227
1228         if (cma_disable_callback(id_priv, CMA_CONNECT))
1229                 return 0;
1230
1231         memset(&event, 0, sizeof event);
1232         switch (iw_event->event) {
1233         case IW_CM_EVENT_CLOSE:
1234                 event.event = RDMA_CM_EVENT_DISCONNECTED;
1235                 break;
1236         case IW_CM_EVENT_CONNECT_REPLY:
1237                 sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1238                 *sin = iw_event->local_addr;
1239                 sin = (struct sockaddr_in *) &id_priv->id.route.addr.dst_addr;
1240                 *sin = iw_event->remote_addr;
1241                 switch (iw_event->status) {
1242                 case 0:
1243                         event.event = RDMA_CM_EVENT_ESTABLISHED;
1244                         break;
1245                 case -ECONNRESET:
1246                 case -ECONNREFUSED:
1247                         event.event = RDMA_CM_EVENT_REJECTED;
1248                         break;
1249                 case -ETIMEDOUT:
1250                         event.event = RDMA_CM_EVENT_UNREACHABLE;
1251                         break;
1252                 default:
1253                         event.event = RDMA_CM_EVENT_CONNECT_ERROR;
1254                         break;
1255                 }
1256                 break;
1257         case IW_CM_EVENT_ESTABLISHED:
1258                 event.event = RDMA_CM_EVENT_ESTABLISHED;
1259                 break;
1260         default:
1261                 BUG_ON(1);
1262         }
1263
1264         event.status = iw_event->status;
1265         event.param.conn.private_data = iw_event->private_data;
1266         event.param.conn.private_data_len = iw_event->private_data_len;
1267         ret = id_priv->id.event_handler(&id_priv->id, &event);
1268         if (ret) {
1269                 /* Destroy the CM ID by returning a non-zero value. */
1270                 id_priv->cm_id.iw = NULL;
1271                 cma_exch(id_priv, CMA_DESTROYING);
1272                 mutex_unlock(&id_priv->handler_mutex);
1273                 rdma_destroy_id(&id_priv->id);
1274                 return ret;
1275         }
1276
1277         mutex_unlock(&id_priv->handler_mutex);
1278         return ret;
1279 }
1280
1281 static int iw_conn_req_handler(struct iw_cm_id *cm_id,
1282                                struct iw_cm_event *iw_event)
1283 {
1284         struct rdma_cm_id *new_cm_id;
1285         struct rdma_id_private *listen_id, *conn_id;
1286         struct sockaddr_in *sin;
1287         struct net_device *dev = NULL;
1288         struct rdma_cm_event event;
1289         int ret;
1290         struct ib_device_attr attr;
1291
1292         listen_id = cm_id->context;
1293         if (cma_disable_callback(listen_id, CMA_LISTEN))
1294                 return -ECONNABORTED;
1295
1296         /* Create a new RDMA id for the new IW CM ID */
1297         new_cm_id = rdma_create_id(listen_id->id.event_handler,
1298                                    listen_id->id.context,
1299                                    RDMA_PS_TCP);
1300         if (IS_ERR(new_cm_id)) {
1301                 ret = -ENOMEM;
1302                 goto out;
1303         }
1304         conn_id = container_of(new_cm_id, struct rdma_id_private, id);
1305         mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
1306         conn_id->state = CMA_CONNECT;
1307
1308         dev = ip_dev_find(&init_net, iw_event->local_addr.sin_addr.s_addr);
1309         if (!dev) {
1310                 ret = -EADDRNOTAVAIL;
1311                 mutex_unlock(&conn_id->handler_mutex);
1312                 rdma_destroy_id(new_cm_id);
1313                 goto out;
1314         }
1315         ret = rdma_copy_addr(&conn_id->id.route.addr.dev_addr, dev, NULL);
1316         if (ret) {
1317                 mutex_unlock(&conn_id->handler_mutex);
1318                 rdma_destroy_id(new_cm_id);
1319                 goto out;
1320         }
1321
1322         mutex_lock(&lock);
1323         ret = cma_acquire_dev(conn_id);
1324         mutex_unlock(&lock);
1325         if (ret) {
1326                 mutex_unlock(&conn_id->handler_mutex);
1327                 rdma_destroy_id(new_cm_id);
1328                 goto out;
1329         }
1330
1331         conn_id->cm_id.iw = cm_id;
1332         cm_id->context = conn_id;
1333         cm_id->cm_handler = cma_iw_handler;
1334
1335         sin = (struct sockaddr_in *) &new_cm_id->route.addr.src_addr;
1336         *sin = iw_event->local_addr;
1337         sin = (struct sockaddr_in *) &new_cm_id->route.addr.dst_addr;
1338         *sin = iw_event->remote_addr;
1339
1340         ret = ib_query_device(conn_id->id.device, &attr);
1341         if (ret) {
1342                 mutex_unlock(&conn_id->handler_mutex);
1343                 rdma_destroy_id(new_cm_id);
1344                 goto out;
1345         }
1346
1347         memset(&event, 0, sizeof event);
1348         event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
1349         event.param.conn.private_data = iw_event->private_data;
1350         event.param.conn.private_data_len = iw_event->private_data_len;
1351         event.param.conn.initiator_depth = attr.max_qp_init_rd_atom;
1352         event.param.conn.responder_resources = attr.max_qp_rd_atom;
1353         ret = conn_id->id.event_handler(&conn_id->id, &event);
1354         if (ret) {
1355                 /* User wants to destroy the CM ID */
1356                 conn_id->cm_id.iw = NULL;
1357                 cma_exch(conn_id, CMA_DESTROYING);
1358                 mutex_unlock(&conn_id->handler_mutex);
1359                 rdma_destroy_id(&conn_id->id);
1360                 goto out;
1361         }
1362
1363         mutex_unlock(&conn_id->handler_mutex);
1364
1365 out:
1366         if (dev)
1367                 dev_put(dev);
1368         mutex_unlock(&listen_id->handler_mutex);
1369         return ret;
1370 }
1371
1372 static int cma_ib_listen(struct rdma_id_private *id_priv)
1373 {
1374         struct ib_cm_compare_data compare_data;
1375         struct sockaddr *addr;
1376         __be64 svc_id;
1377         int ret;
1378
1379         id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device, cma_req_handler,
1380                                             id_priv);
1381         if (IS_ERR(id_priv->cm_id.ib))
1382                 return PTR_ERR(id_priv->cm_id.ib);
1383
1384         addr = (struct sockaddr *) &id_priv->id.route.addr.src_addr;
1385         svc_id = cma_get_service_id(id_priv->id.ps, addr);
1386         if (cma_any_addr(addr))
1387                 ret = ib_cm_listen(id_priv->cm_id.ib, svc_id, 0, NULL);
1388         else {
1389                 cma_set_compare_data(id_priv->id.ps, addr, &compare_data);
1390                 ret = ib_cm_listen(id_priv->cm_id.ib, svc_id, 0, &compare_data);
1391         }
1392
1393         if (ret) {
1394                 ib_destroy_cm_id(id_priv->cm_id.ib);
1395                 id_priv->cm_id.ib = NULL;
1396         }
1397
1398         return ret;
1399 }
1400
1401 static int cma_iw_listen(struct rdma_id_private *id_priv, int backlog)
1402 {
1403         int ret;
1404         struct sockaddr_in *sin;
1405
1406         id_priv->cm_id.iw = iw_create_cm_id(id_priv->id.device,
1407                                             iw_conn_req_handler,
1408                                             id_priv);
1409         if (IS_ERR(id_priv->cm_id.iw))
1410                 return PTR_ERR(id_priv->cm_id.iw);
1411
1412         sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1413         id_priv->cm_id.iw->local_addr = *sin;
1414
1415         ret = iw_cm_listen(id_priv->cm_id.iw, backlog);
1416
1417         if (ret) {
1418                 iw_destroy_cm_id(id_priv->cm_id.iw);
1419                 id_priv->cm_id.iw = NULL;
1420         }
1421
1422         return ret;
1423 }
1424
1425 static int cma_listen_handler(struct rdma_cm_id *id,
1426                               struct rdma_cm_event *event)
1427 {
1428         struct rdma_id_private *id_priv = id->context;
1429
1430         id->context = id_priv->id.context;
1431         id->event_handler = id_priv->id.event_handler;
1432         return id_priv->id.event_handler(id, event);
1433 }
1434
1435 static void cma_listen_on_dev(struct rdma_id_private *id_priv,
1436                               struct cma_device *cma_dev)
1437 {
1438         struct rdma_id_private *dev_id_priv;
1439         struct rdma_cm_id *id;
1440         int ret;
1441
1442         id = rdma_create_id(cma_listen_handler, id_priv, id_priv->id.ps);
1443         if (IS_ERR(id))
1444                 return;
1445
1446         dev_id_priv = container_of(id, struct rdma_id_private, id);
1447
1448         dev_id_priv->state = CMA_ADDR_BOUND;
1449         memcpy(&id->route.addr.src_addr, &id_priv->id.route.addr.src_addr,
1450                ip_addr_size((struct sockaddr *) &id_priv->id.route.addr.src_addr));
1451
1452         cma_attach_to_dev(dev_id_priv, cma_dev);
1453         list_add_tail(&dev_id_priv->listen_list, &id_priv->listen_list);
1454         atomic_inc(&id_priv->refcount);
1455         dev_id_priv->internal_id = 1;
1456
1457         ret = rdma_listen(id, id_priv->backlog);
1458         if (ret)
1459                 printk(KERN_WARNING "RDMA CMA: cma_listen_on_dev, error %d, "
1460                        "listening on device %s\n", ret, cma_dev->device->name);
1461 }
1462
1463 static void cma_listen_on_all(struct rdma_id_private *id_priv)
1464 {
1465         struct cma_device *cma_dev;
1466
1467         mutex_lock(&lock);
1468         list_add_tail(&id_priv->list, &listen_any_list);
1469         list_for_each_entry(cma_dev, &dev_list, list)
1470                 cma_listen_on_dev(id_priv, cma_dev);
1471         mutex_unlock(&lock);
1472 }
1473
1474 static int cma_bind_any(struct rdma_cm_id *id, sa_family_t af)
1475 {
1476         struct sockaddr_storage addr_in;
1477
1478         memset(&addr_in, 0, sizeof addr_in);
1479         addr_in.ss_family = af;
1480         return rdma_bind_addr(id, (struct sockaddr *) &addr_in);
1481 }
1482
1483 int rdma_listen(struct rdma_cm_id *id, int backlog)
1484 {
1485         struct rdma_id_private *id_priv;
1486         int ret;
1487
1488         id_priv = container_of(id, struct rdma_id_private, id);
1489         if (id_priv->state == CMA_IDLE) {
1490                 ret = cma_bind_any(id, AF_INET);
1491                 if (ret)
1492                         return ret;
1493         }
1494
1495         if (!cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_LISTEN))
1496                 return -EINVAL;
1497
1498         id_priv->backlog = backlog;
1499         if (id->device) {
1500                 switch (rdma_node_get_transport(id->device->node_type)) {
1501                 case RDMA_TRANSPORT_IB:
1502                         ret = cma_ib_listen(id_priv);
1503                         if (ret)
1504                                 goto err;
1505                         break;
1506                 case RDMA_TRANSPORT_IWARP:
1507                         ret = cma_iw_listen(id_priv, backlog);
1508                         if (ret)
1509                                 goto err;
1510                         break;
1511                 default:
1512                         ret = -ENOSYS;
1513                         goto err;
1514                 }
1515         } else
1516                 cma_listen_on_all(id_priv);
1517
1518         return 0;
1519 err:
1520         id_priv->backlog = 0;
1521         cma_comp_exch(id_priv, CMA_LISTEN, CMA_ADDR_BOUND);
1522         return ret;
1523 }
1524 EXPORT_SYMBOL(rdma_listen);
1525
1526 void rdma_set_service_type(struct rdma_cm_id *id, int tos)
1527 {
1528         struct rdma_id_private *id_priv;
1529
1530         id_priv = container_of(id, struct rdma_id_private, id);
1531         id_priv->tos = (u8) tos;
1532 }
1533 EXPORT_SYMBOL(rdma_set_service_type);
1534
1535 static void cma_query_handler(int status, struct ib_sa_path_rec *path_rec,
1536                               void *context)
1537 {
1538         struct cma_work *work = context;
1539         struct rdma_route *route;
1540
1541         route = &work->id->id.route;
1542
1543         if (!status) {
1544                 route->num_paths = 1;
1545                 *route->path_rec = *path_rec;
1546         } else {
1547                 work->old_state = CMA_ROUTE_QUERY;
1548                 work->new_state = CMA_ADDR_RESOLVED;
1549                 work->event.event = RDMA_CM_EVENT_ROUTE_ERROR;
1550                 work->event.status = status;
1551         }
1552
1553         queue_work(cma_wq, &work->work);
1554 }
1555
1556 static int cma_query_ib_route(struct rdma_id_private *id_priv, int timeout_ms,
1557                               struct cma_work *work)
1558 {
1559         struct rdma_addr *addr = &id_priv->id.route.addr;
1560         struct ib_sa_path_rec path_rec;
1561         ib_sa_comp_mask comp_mask;
1562         struct sockaddr_in6 *sin6;
1563
1564         memset(&path_rec, 0, sizeof path_rec);
1565         ib_addr_get_sgid(&addr->dev_addr, &path_rec.sgid);
1566         ib_addr_get_dgid(&addr->dev_addr, &path_rec.dgid);
1567         path_rec.pkey = cpu_to_be16(ib_addr_get_pkey(&addr->dev_addr));
1568         path_rec.numb_path = 1;
1569         path_rec.reversible = 1;
1570         path_rec.service_id = cma_get_service_id(id_priv->id.ps,
1571                                                         (struct sockaddr *) &addr->dst_addr);
1572
1573         comp_mask = IB_SA_PATH_REC_DGID | IB_SA_PATH_REC_SGID |
1574                     IB_SA_PATH_REC_PKEY | IB_SA_PATH_REC_NUMB_PATH |
1575                     IB_SA_PATH_REC_REVERSIBLE | IB_SA_PATH_REC_SERVICE_ID;
1576
1577         if (addr->src_addr.ss_family == AF_INET) {
1578                 path_rec.qos_class = cpu_to_be16((u16) id_priv->tos);
1579                 comp_mask |= IB_SA_PATH_REC_QOS_CLASS;
1580         } else {
1581                 sin6 = (struct sockaddr_in6 *) &addr->src_addr;
1582                 path_rec.traffic_class = (u8) (be32_to_cpu(sin6->sin6_flowinfo) >> 20);
1583                 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
1584         }
1585
1586         id_priv->query_id = ib_sa_path_rec_get(&sa_client, id_priv->id.device,
1587                                                id_priv->id.port_num, &path_rec,
1588                                                comp_mask, timeout_ms,
1589                                                GFP_KERNEL, cma_query_handler,
1590                                                work, &id_priv->query);
1591
1592         return (id_priv->query_id < 0) ? id_priv->query_id : 0;
1593 }
1594
1595 static void cma_work_handler(struct work_struct *_work)
1596 {
1597         struct cma_work *work = container_of(_work, struct cma_work, work);
1598         struct rdma_id_private *id_priv = work->id;
1599         int destroy = 0;
1600
1601         mutex_lock(&id_priv->handler_mutex);
1602         if (!cma_comp_exch(id_priv, work->old_state, work->new_state))
1603                 goto out;
1604
1605         if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
1606                 cma_exch(id_priv, CMA_DESTROYING);
1607                 destroy = 1;
1608         }
1609 out:
1610         mutex_unlock(&id_priv->handler_mutex);
1611         cma_deref_id(id_priv);
1612         if (destroy)
1613                 rdma_destroy_id(&id_priv->id);
1614         kfree(work);
1615 }
1616
1617 static void cma_ndev_work_handler(struct work_struct *_work)
1618 {
1619         struct cma_ndev_work *work = container_of(_work, struct cma_ndev_work, work);
1620         struct rdma_id_private *id_priv = work->id;
1621         int destroy = 0;
1622
1623         mutex_lock(&id_priv->handler_mutex);
1624         if (id_priv->state == CMA_DESTROYING ||
1625             id_priv->state == CMA_DEVICE_REMOVAL)
1626                 goto out;
1627
1628         if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
1629                 cma_exch(id_priv, CMA_DESTROYING);
1630                 destroy = 1;
1631         }
1632
1633 out:
1634         mutex_unlock(&id_priv->handler_mutex);
1635         cma_deref_id(id_priv);
1636         if (destroy)
1637                 rdma_destroy_id(&id_priv->id);
1638         kfree(work);
1639 }
1640
1641 static int cma_resolve_ib_route(struct rdma_id_private *id_priv, int timeout_ms)
1642 {
1643         struct rdma_route *route = &id_priv->id.route;
1644         struct cma_work *work;
1645         int ret;
1646
1647         work = kzalloc(sizeof *work, GFP_KERNEL);
1648         if (!work)
1649                 return -ENOMEM;
1650
1651         work->id = id_priv;
1652         INIT_WORK(&work->work, cma_work_handler);
1653         work->old_state = CMA_ROUTE_QUERY;
1654         work->new_state = CMA_ROUTE_RESOLVED;
1655         work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
1656
1657         route->path_rec = kmalloc(sizeof *route->path_rec, GFP_KERNEL);
1658         if (!route->path_rec) {
1659                 ret = -ENOMEM;
1660                 goto err1;
1661         }
1662
1663         ret = cma_query_ib_route(id_priv, timeout_ms, work);
1664         if (ret)
1665                 goto err2;
1666
1667         return 0;
1668 err2:
1669         kfree(route->path_rec);
1670         route->path_rec = NULL;
1671 err1:
1672         kfree(work);
1673         return ret;
1674 }
1675
1676 int rdma_set_ib_paths(struct rdma_cm_id *id,
1677                       struct ib_sa_path_rec *path_rec, int num_paths)
1678 {
1679         struct rdma_id_private *id_priv;
1680         int ret;
1681
1682         id_priv = container_of(id, struct rdma_id_private, id);
1683         if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ROUTE_RESOLVED))
1684                 return -EINVAL;
1685
1686         id->route.path_rec = kmalloc(sizeof *path_rec * num_paths, GFP_KERNEL);
1687         if (!id->route.path_rec) {
1688                 ret = -ENOMEM;
1689                 goto err;
1690         }
1691
1692         memcpy(id->route.path_rec, path_rec, sizeof *path_rec * num_paths);
1693         return 0;
1694 err:
1695         cma_comp_exch(id_priv, CMA_ROUTE_RESOLVED, CMA_ADDR_RESOLVED);
1696         return ret;
1697 }
1698 EXPORT_SYMBOL(rdma_set_ib_paths);
1699
1700 static int cma_resolve_iw_route(struct rdma_id_private *id_priv, int timeout_ms)
1701 {
1702         struct cma_work *work;
1703
1704         work = kzalloc(sizeof *work, GFP_KERNEL);
1705         if (!work)
1706                 return -ENOMEM;
1707
1708         work->id = id_priv;
1709         INIT_WORK(&work->work, cma_work_handler);
1710         work->old_state = CMA_ROUTE_QUERY;
1711         work->new_state = CMA_ROUTE_RESOLVED;
1712         work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
1713         queue_work(cma_wq, &work->work);
1714         return 0;
1715 }
1716
1717 int rdma_resolve_route(struct rdma_cm_id *id, int timeout_ms)
1718 {
1719         struct rdma_id_private *id_priv;
1720         int ret;
1721
1722         id_priv = container_of(id, struct rdma_id_private, id);
1723         if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ROUTE_QUERY))
1724                 return -EINVAL;
1725
1726         atomic_inc(&id_priv->refcount);
1727         switch (rdma_node_get_transport(id->device->node_type)) {
1728         case RDMA_TRANSPORT_IB:
1729                 ret = cma_resolve_ib_route(id_priv, timeout_ms);
1730                 break;
1731         case RDMA_TRANSPORT_IWARP:
1732                 ret = cma_resolve_iw_route(id_priv, timeout_ms);
1733                 break;
1734         default:
1735                 ret = -ENOSYS;
1736                 break;
1737         }
1738         if (ret)
1739                 goto err;
1740
1741         return 0;
1742 err:
1743         cma_comp_exch(id_priv, CMA_ROUTE_QUERY, CMA_ADDR_RESOLVED);
1744         cma_deref_id(id_priv);
1745         return ret;
1746 }
1747 EXPORT_SYMBOL(rdma_resolve_route);
1748
1749 static int cma_bind_loopback(struct rdma_id_private *id_priv)
1750 {
1751         struct cma_device *cma_dev;
1752         struct ib_port_attr port_attr;
1753         union ib_gid gid;
1754         u16 pkey;
1755         int ret;
1756         u8 p;
1757
1758         mutex_lock(&lock);
1759         if (list_empty(&dev_list)) {
1760                 ret = -ENODEV;
1761                 goto out;
1762         }
1763         list_for_each_entry(cma_dev, &dev_list, list)
1764                 for (p = 1; p <= cma_dev->device->phys_port_cnt; ++p)
1765                         if (!ib_query_port(cma_dev->device, p, &port_attr) &&
1766                             port_attr.state == IB_PORT_ACTIVE)
1767                                 goto port_found;
1768
1769         p = 1;
1770         cma_dev = list_entry(dev_list.next, struct cma_device, list);
1771
1772 port_found:
1773         ret = ib_get_cached_gid(cma_dev->device, p, 0, &gid);
1774         if (ret)
1775                 goto out;
1776
1777         ret = ib_get_cached_pkey(cma_dev->device, p, 0, &pkey);
1778         if (ret)
1779                 goto out;
1780
1781         ib_addr_set_sgid(&id_priv->id.route.addr.dev_addr, &gid);
1782         ib_addr_set_pkey(&id_priv->id.route.addr.dev_addr, pkey);
1783         id_priv->id.port_num = p;
1784         cma_attach_to_dev(id_priv, cma_dev);
1785 out:
1786         mutex_unlock(&lock);
1787         return ret;
1788 }
1789
1790 static void addr_handler(int status, struct sockaddr *src_addr,
1791                          struct rdma_dev_addr *dev_addr, void *context)
1792 {
1793         struct rdma_id_private *id_priv = context;
1794         struct rdma_cm_event event;
1795
1796         memset(&event, 0, sizeof event);
1797         mutex_lock(&id_priv->handler_mutex);
1798
1799         /*
1800          * Grab mutex to block rdma_destroy_id() from removing the device while
1801          * we're trying to acquire it.
1802          */
1803         mutex_lock(&lock);
1804         if (!cma_comp_exch(id_priv, CMA_ADDR_QUERY, CMA_ADDR_RESOLVED)) {
1805                 mutex_unlock(&lock);
1806                 goto out;
1807         }
1808
1809         if (!status && !id_priv->cma_dev)
1810                 status = cma_acquire_dev(id_priv);
1811         mutex_unlock(&lock);
1812
1813         if (status) {
1814                 if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ADDR_BOUND))
1815                         goto out;
1816                 event.event = RDMA_CM_EVENT_ADDR_ERROR;
1817                 event.status = status;
1818         } else {
1819                 memcpy(&id_priv->id.route.addr.src_addr, src_addr,
1820                        ip_addr_size(src_addr));
1821                 event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
1822         }
1823
1824         if (id_priv->id.event_handler(&id_priv->id, &event)) {
1825                 cma_exch(id_priv, CMA_DESTROYING);
1826                 mutex_unlock(&id_priv->handler_mutex);
1827                 cma_deref_id(id_priv);
1828                 rdma_destroy_id(&id_priv->id);
1829                 return;
1830         }
1831 out:
1832         mutex_unlock(&id_priv->handler_mutex);
1833         cma_deref_id(id_priv);
1834 }
1835
1836 static int cma_resolve_loopback(struct rdma_id_private *id_priv)
1837 {
1838         struct cma_work *work;
1839         struct sockaddr_in *src_in, *dst_in;
1840         union ib_gid gid;
1841         int ret;
1842
1843         work = kzalloc(sizeof *work, GFP_KERNEL);
1844         if (!work)
1845                 return -ENOMEM;
1846
1847         if (!id_priv->cma_dev) {
1848                 ret = cma_bind_loopback(id_priv);
1849                 if (ret)
1850                         goto err;
1851         }
1852
1853         ib_addr_get_sgid(&id_priv->id.route.addr.dev_addr, &gid);
1854         ib_addr_set_dgid(&id_priv->id.route.addr.dev_addr, &gid);
1855
1856         if (cma_zero_addr((struct sockaddr *) &id_priv->id.route.addr.src_addr)) {
1857                 src_in = (struct sockaddr_in *)&id_priv->id.route.addr.src_addr;
1858                 dst_in = (struct sockaddr_in *)&id_priv->id.route.addr.dst_addr;
1859                 src_in->sin_family = dst_in->sin_family;
1860                 src_in->sin_addr.s_addr = dst_in->sin_addr.s_addr;
1861         }
1862
1863         work->id = id_priv;
1864         INIT_WORK(&work->work, cma_work_handler);
1865         work->old_state = CMA_ADDR_QUERY;
1866         work->new_state = CMA_ADDR_RESOLVED;
1867         work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
1868         queue_work(cma_wq, &work->work);
1869         return 0;
1870 err:
1871         kfree(work);
1872         return ret;
1873 }
1874
1875 static int cma_bind_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
1876                          struct sockaddr *dst_addr)
1877 {
1878         if (src_addr && src_addr->sa_family)
1879                 return rdma_bind_addr(id, src_addr);
1880         else
1881                 return cma_bind_any(id, dst_addr->sa_family);
1882 }
1883
1884 int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
1885                       struct sockaddr *dst_addr, int timeout_ms)
1886 {
1887         struct rdma_id_private *id_priv;
1888         int ret;
1889
1890         id_priv = container_of(id, struct rdma_id_private, id);
1891         if (id_priv->state == CMA_IDLE) {
1892                 ret = cma_bind_addr(id, src_addr, dst_addr);
1893                 if (ret)
1894                         return ret;
1895         }
1896
1897         if (!cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_ADDR_QUERY))
1898                 return -EINVAL;
1899
1900         atomic_inc(&id_priv->refcount);
1901         memcpy(&id->route.addr.dst_addr, dst_addr, ip_addr_size(dst_addr));
1902         if (cma_any_addr(dst_addr))
1903                 ret = cma_resolve_loopback(id_priv);
1904         else
1905                 ret = rdma_resolve_ip(&addr_client, (struct sockaddr *) &id->route.addr.src_addr,
1906                                       dst_addr, &id->route.addr.dev_addr,
1907                                       timeout_ms, addr_handler, id_priv);
1908         if (ret)
1909                 goto err;
1910
1911         return 0;
1912 err:
1913         cma_comp_exch(id_priv, CMA_ADDR_QUERY, CMA_ADDR_BOUND);
1914         cma_deref_id(id_priv);
1915         return ret;
1916 }
1917 EXPORT_SYMBOL(rdma_resolve_addr);
1918
1919 static void cma_bind_port(struct rdma_bind_list *bind_list,
1920                           struct rdma_id_private *id_priv)
1921 {
1922         struct sockaddr_in *sin;
1923
1924         sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1925         sin->sin_port = htons(bind_list->port);
1926         id_priv->bind_list = bind_list;
1927         hlist_add_head(&id_priv->node, &bind_list->owners);
1928 }
1929
1930 static int cma_alloc_port(struct idr *ps, struct rdma_id_private *id_priv,
1931                           unsigned short snum)
1932 {
1933         struct rdma_bind_list *bind_list;
1934         int port, ret;
1935
1936         bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL);
1937         if (!bind_list)
1938                 return -ENOMEM;
1939
1940         do {
1941                 ret = idr_get_new_above(ps, bind_list, snum, &port);
1942         } while ((ret == -EAGAIN) && idr_pre_get(ps, GFP_KERNEL));
1943
1944         if (ret)
1945                 goto err1;
1946
1947         if (port != snum) {
1948                 ret = -EADDRNOTAVAIL;
1949                 goto err2;
1950         }
1951
1952         bind_list->ps = ps;
1953         bind_list->port = (unsigned short) port;
1954         cma_bind_port(bind_list, id_priv);
1955         return 0;
1956 err2:
1957         idr_remove(ps, port);
1958 err1:
1959         kfree(bind_list);
1960         return ret;
1961 }
1962
1963 static int cma_alloc_any_port(struct idr *ps, struct rdma_id_private *id_priv)
1964 {
1965         struct rdma_bind_list *bind_list;
1966         int port, ret, low, high;
1967
1968         bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL);
1969         if (!bind_list)
1970                 return -ENOMEM;
1971
1972 retry:
1973         /* FIXME: add proper port randomization per like inet_csk_get_port */
1974         do {
1975                 ret = idr_get_new_above(ps, bind_list, next_port, &port);
1976         } while ((ret == -EAGAIN) && idr_pre_get(ps, GFP_KERNEL));
1977
1978         if (ret)
1979                 goto err1;
1980
1981         inet_get_local_port_range(&low, &high);
1982         if (port > high) {
1983                 if (next_port != low) {
1984                         idr_remove(ps, port);
1985                         next_port = low;
1986                         goto retry;
1987                 }
1988                 ret = -EADDRNOTAVAIL;
1989                 goto err2;
1990         }
1991
1992         if (port == high)
1993                 next_port = low;
1994         else
1995                 next_port = port + 1;
1996
1997         bind_list->ps = ps;
1998         bind_list->port = (unsigned short) port;
1999         cma_bind_port(bind_list, id_priv);
2000         return 0;
2001 err2:
2002         idr_remove(ps, port);
2003 err1:
2004         kfree(bind_list);
2005         return ret;
2006 }
2007
2008 static int cma_use_port(struct idr *ps, struct rdma_id_private *id_priv)
2009 {
2010         struct rdma_id_private *cur_id;
2011         struct sockaddr_in *sin, *cur_sin;
2012         struct rdma_bind_list *bind_list;
2013         struct hlist_node *node;
2014         unsigned short snum;
2015
2016         sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
2017         snum = ntohs(sin->sin_port);
2018         if (snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
2019                 return -EACCES;
2020
2021         bind_list = idr_find(ps, snum);
2022         if (!bind_list)
2023                 return cma_alloc_port(ps, id_priv, snum);
2024
2025         /*
2026          * We don't support binding to any address if anyone is bound to
2027          * a specific address on the same port.
2028          */
2029         if (cma_any_addr((struct sockaddr *) &id_priv->id.route.addr.src_addr))
2030                 return -EADDRNOTAVAIL;
2031
2032         hlist_for_each_entry(cur_id, node, &bind_list->owners, node) {
2033                 if (cma_any_addr((struct sockaddr *) &cur_id->id.route.addr.src_addr))
2034                         return -EADDRNOTAVAIL;
2035
2036                 cur_sin = (struct sockaddr_in *) &cur_id->id.route.addr.src_addr;
2037                 if (sin->sin_addr.s_addr == cur_sin->sin_addr.s_addr)
2038                         return -EADDRINUSE;
2039         }
2040
2041         cma_bind_port(bind_list, id_priv);
2042         return 0;
2043 }
2044
2045 static int cma_get_port(struct rdma_id_private *id_priv)
2046 {
2047         struct idr *ps;
2048         int ret;
2049
2050         switch (id_priv->id.ps) {
2051         case RDMA_PS_SDP:
2052                 ps = &sdp_ps;
2053                 break;
2054         case RDMA_PS_TCP:
2055                 ps = &tcp_ps;
2056                 break;
2057         case RDMA_PS_UDP:
2058                 ps = &udp_ps;
2059                 break;
2060         case RDMA_PS_IPOIB:
2061                 ps = &ipoib_ps;
2062                 break;
2063         default:
2064                 return -EPROTONOSUPPORT;
2065         }
2066
2067         mutex_lock(&lock);
2068         if (cma_any_port((struct sockaddr *) &id_priv->id.route.addr.src_addr))
2069                 ret = cma_alloc_any_port(ps, id_priv);
2070         else
2071                 ret = cma_use_port(ps, id_priv);
2072         mutex_unlock(&lock);
2073
2074         return ret;
2075 }
2076
2077 int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr)
2078 {
2079         struct rdma_id_private *id_priv;
2080         int ret;
2081
2082         if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6)
2083                 return -EAFNOSUPPORT;
2084
2085         id_priv = container_of(id, struct rdma_id_private, id);
2086         if (!cma_comp_exch(id_priv, CMA_IDLE, CMA_ADDR_BOUND))
2087                 return -EINVAL;
2088
2089         if (!cma_any_addr(addr)) {
2090                 ret = rdma_translate_ip(addr, &id->route.addr.dev_addr);
2091                 if (ret)
2092                         goto err1;
2093
2094                 mutex_lock(&lock);
2095                 ret = cma_acquire_dev(id_priv);
2096                 mutex_unlock(&lock);
2097                 if (ret)
2098                         goto err1;
2099         }
2100
2101         memcpy(&id->route.addr.src_addr, addr, ip_addr_size(addr));
2102         ret = cma_get_port(id_priv);
2103         if (ret)
2104                 goto err2;
2105
2106         return 0;
2107 err2:
2108         if (!cma_any_addr(addr)) {
2109                 mutex_lock(&lock);
2110                 cma_detach_from_dev(id_priv);
2111                 mutex_unlock(&lock);
2112         }
2113 err1:
2114         cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_IDLE);
2115         return ret;
2116 }
2117 EXPORT_SYMBOL(rdma_bind_addr);
2118
2119 static int cma_format_hdr(void *hdr, enum rdma_port_space ps,
2120                           struct rdma_route *route)
2121 {
2122         struct cma_hdr *cma_hdr;
2123         struct sdp_hh *sdp_hdr;
2124
2125         if (route->addr.src_addr.ss_family == AF_INET) {
2126                 struct sockaddr_in *src4, *dst4;
2127
2128                 src4 = (struct sockaddr_in *) &route->addr.src_addr;
2129                 dst4 = (struct sockaddr_in *) &route->addr.dst_addr;
2130
2131                 switch (ps) {
2132                 case RDMA_PS_SDP:
2133                         sdp_hdr = hdr;
2134                         if (sdp_get_majv(sdp_hdr->sdp_version) != SDP_MAJ_VERSION)
2135                                 return -EINVAL;
2136                         sdp_set_ip_ver(sdp_hdr, 4);
2137                         sdp_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
2138                         sdp_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
2139                         sdp_hdr->port = src4->sin_port;
2140                         break;
2141                 default:
2142                         cma_hdr = hdr;
2143                         cma_hdr->cma_version = CMA_VERSION;
2144                         cma_set_ip_ver(cma_hdr, 4);
2145                         cma_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
2146                         cma_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
2147                         cma_hdr->port = src4->sin_port;
2148                         break;
2149                 }
2150         } else {
2151                 struct sockaddr_in6 *src6, *dst6;
2152
2153                 src6 = (struct sockaddr_in6 *) &route->addr.src_addr;
2154                 dst6 = (struct sockaddr_in6 *) &route->addr.dst_addr;
2155
2156                 switch (ps) {
2157                 case RDMA_PS_SDP:
2158                         sdp_hdr = hdr;
2159                         if (sdp_get_majv(sdp_hdr->sdp_version) != SDP_MAJ_VERSION)
2160                                 return -EINVAL;
2161                         sdp_set_ip_ver(sdp_hdr, 6);
2162                         sdp_hdr->src_addr.ip6 = src6->sin6_addr;
2163                         sdp_hdr->dst_addr.ip6 = dst6->sin6_addr;
2164                         sdp_hdr->port = src6->sin6_port;
2165                         break;
2166                 default:
2167                         cma_hdr = hdr;
2168                         cma_hdr->cma_version = CMA_VERSION;
2169                         cma_set_ip_ver(cma_hdr, 6);
2170                         cma_hdr->src_addr.ip6 = src6->sin6_addr;
2171                         cma_hdr->dst_addr.ip6 = dst6->sin6_addr;
2172                         cma_hdr->port = src6->sin6_port;
2173                         break;
2174                 }
2175         }
2176         return 0;
2177 }
2178
2179 static int cma_sidr_rep_handler(struct ib_cm_id *cm_id,
2180                                 struct ib_cm_event *ib_event)
2181 {
2182         struct rdma_id_private *id_priv = cm_id->context;
2183         struct rdma_cm_event event;
2184         struct ib_cm_sidr_rep_event_param *rep = &ib_event->param.sidr_rep_rcvd;
2185         int ret = 0;
2186
2187         if (cma_disable_callback(id_priv, CMA_CONNECT))
2188                 return 0;
2189
2190         memset(&event, 0, sizeof event);
2191         switch (ib_event->event) {
2192         case IB_CM_SIDR_REQ_ERROR:
2193                 event.event = RDMA_CM_EVENT_UNREACHABLE;
2194                 event.status = -ETIMEDOUT;
2195                 break;
2196         case IB_CM_SIDR_REP_RECEIVED:
2197                 event.param.ud.private_data = ib_event->private_data;
2198                 event.param.ud.private_data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
2199                 if (rep->status != IB_SIDR_SUCCESS) {
2200                         event.event = RDMA_CM_EVENT_UNREACHABLE;
2201                         event.status = ib_event->param.sidr_rep_rcvd.status;
2202                         break;
2203                 }
2204                 if (id_priv->qkey != rep->qkey) {
2205                         event.event = RDMA_CM_EVENT_UNREACHABLE;
2206                         event.status = -EINVAL;
2207                         break;
2208                 }
2209                 ib_init_ah_from_path(id_priv->id.device, id_priv->id.port_num,
2210                                      id_priv->id.route.path_rec,
2211                                      &event.param.ud.ah_attr);
2212                 event.param.ud.qp_num = rep->qpn;
2213                 event.param.ud.qkey = rep->qkey;
2214                 event.event = RDMA_CM_EVENT_ESTABLISHED;
2215                 event.status = 0;
2216                 break;
2217         default:
2218                 printk(KERN_ERR "RDMA CMA: unexpected IB CM event: %d\n",
2219                        ib_event->event);
2220                 goto out;
2221         }
2222
2223         ret = id_priv->id.event_handler(&id_priv->id, &event);
2224         if (ret) {
2225                 /* Destroy the CM ID by returning a non-zero value. */
2226                 id_priv->cm_id.ib = NULL;
2227                 cma_exch(id_priv, CMA_DESTROYING);
2228                 mutex_unlock(&id_priv->handler_mutex);
2229                 rdma_destroy_id(&id_priv->id);
2230                 return ret;
2231         }
2232 out:
2233         mutex_unlock(&id_priv->handler_mutex);
2234         return ret;
2235 }
2236
2237 static int cma_resolve_ib_udp(struct rdma_id_private *id_priv,
2238                               struct rdma_conn_param *conn_param)
2239 {
2240         struct ib_cm_sidr_req_param req;
2241         struct rdma_route *route;
2242         int ret;
2243
2244         req.private_data_len = sizeof(struct cma_hdr) +
2245                                conn_param->private_data_len;
2246         req.private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
2247         if (!req.private_data)
2248                 return -ENOMEM;
2249
2250         if (conn_param->private_data && conn_param->private_data_len)
2251                 memcpy((void *) req.private_data + sizeof(struct cma_hdr),
2252                        conn_param->private_data, conn_param->private_data_len);
2253
2254         route = &id_priv->id.route;
2255         ret = cma_format_hdr((void *) req.private_data, id_priv->id.ps, route);
2256         if (ret)
2257                 goto out;
2258
2259         id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device,
2260                                             cma_sidr_rep_handler, id_priv);
2261         if (IS_ERR(id_priv->cm_id.ib)) {
2262                 ret = PTR_ERR(id_priv->cm_id.ib);
2263                 goto out;
2264         }
2265
2266         req.path = route->path_rec;
2267         req.service_id = cma_get_service_id(id_priv->id.ps,
2268                                             (struct sockaddr *) &route->addr.dst_addr);
2269         req.timeout_ms = 1 << (CMA_CM_RESPONSE_TIMEOUT - 8);
2270         req.max_cm_retries = CMA_MAX_CM_RETRIES;
2271
2272         ret = ib_send_cm_sidr_req(id_priv->cm_id.ib, &req);
2273         if (ret) {
2274                 ib_destroy_cm_id(id_priv->cm_id.ib);
2275                 id_priv->cm_id.ib = NULL;
2276         }
2277 out:
2278         kfree(req.private_data);
2279         return ret;
2280 }
2281
2282 static int cma_connect_ib(struct rdma_id_private *id_priv,
2283                           struct rdma_conn_param *conn_param)
2284 {
2285         struct ib_cm_req_param req;
2286         struct rdma_route *route;
2287         void *private_data;
2288         int offset, ret;
2289
2290         memset(&req, 0, sizeof req);
2291         offset = cma_user_data_offset(id_priv->id.ps);
2292         req.private_data_len = offset + conn_param->private_data_len;
2293         private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
2294         if (!private_data)
2295                 return -ENOMEM;
2296
2297         if (conn_param->private_data && conn_param->private_data_len)
2298                 memcpy(private_data + offset, conn_param->private_data,
2299                        conn_param->private_data_len);
2300
2301         id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device, cma_ib_handler,
2302                                             id_priv);
2303         if (IS_ERR(id_priv->cm_id.ib)) {
2304                 ret = PTR_ERR(id_priv->cm_id.ib);
2305                 goto out;
2306         }
2307
2308         route = &id_priv->id.route;
2309         ret = cma_format_hdr(private_data, id_priv->id.ps, route);
2310         if (ret)
2311                 goto out;
2312         req.private_data = private_data;
2313
2314         req.primary_path = &route->path_rec[0];
2315         if (route->num_paths == 2)
2316                 req.alternate_path = &route->path_rec[1];
2317
2318         req.service_id = cma_get_service_id(id_priv->id.ps,
2319                                             (struct sockaddr *) &route->addr.dst_addr);
2320         req.qp_num = id_priv->qp_num;
2321         req.qp_type = IB_QPT_RC;
2322         req.starting_psn = id_priv->seq_num;
2323         req.responder_resources = conn_param->responder_resources;
2324         req.initiator_depth = conn_param->initiator_depth;
2325         req.flow_control = conn_param->flow_control;
2326         req.retry_count = conn_param->retry_count;
2327         req.rnr_retry_count = conn_param->rnr_retry_count;
2328         req.remote_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
2329         req.local_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
2330         req.max_cm_retries = CMA_MAX_CM_RETRIES;
2331         req.srq = id_priv->srq ? 1 : 0;
2332
2333         ret = ib_send_cm_req(id_priv->cm_id.ib, &req);
2334 out:
2335         if (ret && !IS_ERR(id_priv->cm_id.ib)) {
2336                 ib_destroy_cm_id(id_priv->cm_id.ib);
2337                 id_priv->cm_id.ib = NULL;
2338         }
2339
2340         kfree(private_data);
2341         return ret;
2342 }
2343
2344 static int cma_connect_iw(struct rdma_id_private *id_priv,
2345                           struct rdma_conn_param *conn_param)
2346 {
2347         struct iw_cm_id *cm_id;
2348         struct sockaddr_in* sin;
2349         int ret;
2350         struct iw_cm_conn_param iw_param;
2351
2352         cm_id = iw_create_cm_id(id_priv->id.device, cma_iw_handler, id_priv);
2353         if (IS_ERR(cm_id)) {
2354                 ret = PTR_ERR(cm_id);
2355                 goto out;
2356         }
2357
2358         id_priv->cm_id.iw = cm_id;
2359
2360         sin = (struct sockaddr_in*) &id_priv->id.route.addr.src_addr;
2361         cm_id->local_addr = *sin;
2362
2363         sin = (struct sockaddr_in*) &id_priv->id.route.addr.dst_addr;
2364         cm_id->remote_addr = *sin;
2365
2366         ret = cma_modify_qp_rtr(id_priv, conn_param);
2367         if (ret)
2368                 goto out;
2369
2370         iw_param.ord = conn_param->initiator_depth;
2371         iw_param.ird = conn_param->responder_resources;
2372         iw_param.private_data = conn_param->private_data;
2373         iw_param.private_data_len = conn_param->private_data_len;
2374         if (id_priv->id.qp)
2375                 iw_param.qpn = id_priv->qp_num;
2376         else
2377                 iw_param.qpn = conn_param->qp_num;
2378         ret = iw_cm_connect(cm_id, &iw_param);
2379 out:
2380         if (ret && !IS_ERR(cm_id)) {
2381                 iw_destroy_cm_id(cm_id);
2382                 id_priv->cm_id.iw = NULL;
2383         }
2384         return ret;
2385 }
2386
2387 int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
2388 {
2389         struct rdma_id_private *id_priv;
2390         int ret;
2391
2392         id_priv = container_of(id, struct rdma_id_private, id);
2393         if (!cma_comp_exch(id_priv, CMA_ROUTE_RESOLVED, CMA_CONNECT))
2394                 return -EINVAL;
2395
2396         if (!id->qp) {
2397                 id_priv->qp_num = conn_param->qp_num;
2398                 id_priv->srq = conn_param->srq;
2399         }
2400
2401         switch (rdma_node_get_transport(id->device->node_type)) {
2402         case RDMA_TRANSPORT_IB:
2403                 if (cma_is_ud_ps(id->ps))
2404                         ret = cma_resolve_ib_udp(id_priv, conn_param);
2405                 else
2406                         ret = cma_connect_ib(id_priv, conn_param);
2407                 break;
2408         case RDMA_TRANSPORT_IWARP:
2409                 ret = cma_connect_iw(id_priv, conn_param);
2410                 break;
2411         default:
2412                 ret = -ENOSYS;
2413                 break;
2414         }
2415         if (ret)
2416                 goto err;
2417
2418         return 0;
2419 err:
2420         cma_comp_exch(id_priv, CMA_CONNECT, CMA_ROUTE_RESOLVED);
2421         return ret;
2422 }
2423 EXPORT_SYMBOL(rdma_connect);
2424
2425 static int cma_accept_ib(struct rdma_id_private *id_priv,
2426                          struct rdma_conn_param *conn_param)
2427 {
2428         struct ib_cm_rep_param rep;
2429         int ret;
2430
2431         ret = cma_modify_qp_rtr(id_priv, conn_param);
2432         if (ret)
2433                 goto out;
2434
2435         ret = cma_modify_qp_rts(id_priv, conn_param);
2436         if (ret)
2437                 goto out;
2438
2439         memset(&rep, 0, sizeof rep);
2440         rep.qp_num = id_priv->qp_num;
2441         rep.starting_psn = id_priv->seq_num;
2442         rep.private_data = conn_param->private_data;
2443         rep.private_data_len = conn_param->private_data_len;
2444         rep.responder_resources = conn_param->responder_resources;
2445         rep.initiator_depth = conn_param->initiator_depth;
2446         rep.failover_accepted = 0;
2447         rep.flow_control = conn_param->flow_control;
2448         rep.rnr_retry_count = conn_param->rnr_retry_count;
2449         rep.srq = id_priv->srq ? 1 : 0;
2450
2451         ret = ib_send_cm_rep(id_priv->cm_id.ib, &rep);
2452 out:
2453         return ret;
2454 }
2455
2456 static int cma_accept_iw(struct rdma_id_private *id_priv,
2457                   struct rdma_conn_param *conn_param)
2458 {
2459         struct iw_cm_conn_param iw_param;
2460         int ret;
2461
2462         ret = cma_modify_qp_rtr(id_priv, conn_param);
2463         if (ret)
2464                 return ret;
2465
2466         iw_param.ord = conn_param->initiator_depth;
2467         iw_param.ird = conn_param->responder_resources;
2468         iw_param.private_data = conn_param->private_data;
2469         iw_param.private_data_len = conn_param->private_data_len;
2470         if (id_priv->id.qp) {
2471                 iw_param.qpn = id_priv->qp_num;
2472         } else
2473                 iw_param.qpn = conn_param->qp_num;
2474
2475         return iw_cm_accept(id_priv->cm_id.iw, &iw_param);
2476 }
2477
2478 static int cma_send_sidr_rep(struct rdma_id_private *id_priv,
2479                              enum ib_cm_sidr_status status,
2480                              const void *private_data, int private_data_len)
2481 {
2482         struct ib_cm_sidr_rep_param rep;
2483
2484         memset(&rep, 0, sizeof rep);
2485         rep.status = status;
2486         if (status == IB_SIDR_SUCCESS) {
2487                 rep.qp_num = id_priv->qp_num;
2488                 rep.qkey = id_priv->qkey;
2489         }
2490         rep.private_data = private_data;
2491         rep.private_data_len = private_data_len;
2492
2493         return ib_send_cm_sidr_rep(id_priv->cm_id.ib, &rep);
2494 }
2495
2496 int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
2497 {
2498         struct rdma_id_private *id_priv;
2499         int ret;
2500
2501         id_priv = container_of(id, struct rdma_id_private, id);
2502         if (!cma_comp(id_priv, CMA_CONNECT))
2503                 return -EINVAL;
2504
2505         if (!id->qp && conn_param) {
2506                 id_priv->qp_num = conn_param->qp_num;
2507                 id_priv->srq = conn_param->srq;
2508         }
2509
2510         switch (rdma_node_get_transport(id->device->node_type)) {
2511         case RDMA_TRANSPORT_IB:
2512                 if (cma_is_ud_ps(id->ps))
2513                         ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
2514                                                 conn_param->private_data,
2515                                                 conn_param->private_data_len);
2516                 else if (conn_param)
2517                         ret = cma_accept_ib(id_priv, conn_param);
2518                 else
2519                         ret = cma_rep_recv(id_priv);
2520                 break;
2521         case RDMA_TRANSPORT_IWARP:
2522                 ret = cma_accept_iw(id_priv, conn_param);
2523                 break;
2524         default:
2525                 ret = -ENOSYS;
2526                 break;
2527         }
2528
2529         if (ret)
2530                 goto reject;
2531
2532         return 0;
2533 reject:
2534         cma_modify_qp_err(id_priv);
2535         rdma_reject(id, NULL, 0);
2536         return ret;
2537 }
2538 EXPORT_SYMBOL(rdma_accept);
2539
2540 int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event)
2541 {
2542         struct rdma_id_private *id_priv;
2543         int ret;
2544
2545         id_priv = container_of(id, struct rdma_id_private, id);
2546         if (!cma_has_cm_dev(id_priv))
2547                 return -EINVAL;
2548
2549         switch (id->device->node_type) {
2550         case RDMA_NODE_IB_CA:
2551                 ret = ib_cm_notify(id_priv->cm_id.ib, event);
2552                 break;
2553         default:
2554                 ret = 0;
2555                 break;
2556         }
2557         return ret;
2558 }
2559 EXPORT_SYMBOL(rdma_notify);
2560
2561 int rdma_reject(struct rdma_cm_id *id, const void *private_data,
2562                 u8 private_data_len)
2563 {
2564         struct rdma_id_private *id_priv;
2565         int ret;
2566
2567         id_priv = container_of(id, struct rdma_id_private, id);
2568         if (!cma_has_cm_dev(id_priv))
2569                 return -EINVAL;
2570
2571         switch (rdma_node_get_transport(id->device->node_type)) {
2572         case RDMA_TRANSPORT_IB:
2573                 if (cma_is_ud_ps(id->ps))
2574                         ret = cma_send_sidr_rep(id_priv, IB_SIDR_REJECT,
2575                                                 private_data, private_data_len);
2576                 else
2577                         ret = ib_send_cm_rej(id_priv->cm_id.ib,
2578                                              IB_CM_REJ_CONSUMER_DEFINED, NULL,
2579                                              0, private_data, private_data_len);
2580                 break;
2581         case RDMA_TRANSPORT_IWARP:
2582                 ret = iw_cm_reject(id_priv->cm_id.iw,
2583                                    private_data, private_data_len);
2584                 break;
2585         default:
2586                 ret = -ENOSYS;
2587                 break;
2588         }
2589         return ret;
2590 }
2591 EXPORT_SYMBOL(rdma_reject);
2592
2593 int rdma_disconnect(struct rdma_cm_id *id)
2594 {
2595         struct rdma_id_private *id_priv;
2596         int ret;
2597
2598         id_priv = container_of(id, struct rdma_id_private, id);
2599         if (!cma_has_cm_dev(id_priv))
2600                 return -EINVAL;
2601
2602         switch (rdma_node_get_transport(id->device->node_type)) {
2603         case RDMA_TRANSPORT_IB:
2604                 ret = cma_modify_qp_err(id_priv);
2605                 if (ret)
2606                         goto out;
2607                 /* Initiate or respond to a disconnect. */
2608                 if (ib_send_cm_dreq(id_priv->cm_id.ib, NULL, 0))
2609                         ib_send_cm_drep(id_priv->cm_id.ib, NULL, 0);
2610                 break;
2611         case RDMA_TRANSPORT_IWARP:
2612                 ret = iw_cm_disconnect(id_priv->cm_id.iw, 0);
2613                 break;
2614         default:
2615                 ret = -EINVAL;
2616                 break;
2617         }
2618 out:
2619         return ret;
2620 }
2621 EXPORT_SYMBOL(rdma_disconnect);
2622
2623 static int cma_ib_mc_handler(int status, struct ib_sa_multicast *multicast)
2624 {
2625         struct rdma_id_private *id_priv;
2626         struct cma_multicast *mc = multicast->context;
2627         struct rdma_cm_event event;
2628         int ret;
2629
2630         id_priv = mc->id_priv;
2631         if (cma_disable_callback(id_priv, CMA_ADDR_BOUND) &&
2632             cma_disable_callback(id_priv, CMA_ADDR_RESOLVED))
2633                 return 0;
2634
2635         mutex_lock(&id_priv->qp_mutex);
2636         if (!status && id_priv->id.qp)
2637                 status = ib_attach_mcast(id_priv->id.qp, &multicast->rec.mgid,
2638                                          multicast->rec.mlid);
2639         mutex_unlock(&id_priv->qp_mutex);
2640
2641         memset(&event, 0, sizeof event);
2642         event.status = status;
2643         event.param.ud.private_data = mc->context;
2644         if (!status) {
2645                 event.event = RDMA_CM_EVENT_MULTICAST_JOIN;
2646                 ib_init_ah_from_mcmember(id_priv->id.device,
2647                                          id_priv->id.port_num, &multicast->rec,
2648                                          &event.param.ud.ah_attr);
2649                 event.param.ud.qp_num = 0xFFFFFF;
2650                 event.param.ud.qkey = be32_to_cpu(multicast->rec.qkey);
2651         } else
2652                 event.event = RDMA_CM_EVENT_MULTICAST_ERROR;
2653
2654         ret = id_priv->id.event_handler(&id_priv->id, &event);
2655         if (ret) {
2656                 cma_exch(id_priv, CMA_DESTROYING);
2657                 mutex_unlock(&id_priv->handler_mutex);
2658                 rdma_destroy_id(&id_priv->id);
2659                 return 0;
2660         }
2661
2662         mutex_unlock(&id_priv->handler_mutex);
2663         return 0;
2664 }
2665
2666 static void cma_set_mgid(struct rdma_id_private *id_priv,
2667                          struct sockaddr *addr, union ib_gid *mgid)
2668 {
2669         unsigned char mc_map[MAX_ADDR_LEN];
2670         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
2671         struct sockaddr_in *sin = (struct sockaddr_in *) addr;
2672         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) addr;
2673
2674         if (cma_any_addr(addr)) {
2675                 memset(mgid, 0, sizeof *mgid);
2676         } else if ((addr->sa_family == AF_INET6) &&
2677                    ((be32_to_cpu(sin6->sin6_addr.s6_addr32[0]) & 0xFF10A01B) ==
2678                                                                  0xFF10A01B)) {
2679                 /* IPv6 address is an SA assigned MGID. */
2680                 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
2681         } else {
2682                 ip_ib_mc_map(sin->sin_addr.s_addr, dev_addr->broadcast, mc_map);
2683                 if (id_priv->id.ps == RDMA_PS_UDP)
2684                         mc_map[7] = 0x01;       /* Use RDMA CM signature */
2685                 *mgid = *(union ib_gid *) (mc_map + 4);
2686         }
2687 }
2688
2689 static int cma_join_ib_multicast(struct rdma_id_private *id_priv,
2690                                  struct cma_multicast *mc)
2691 {
2692         struct ib_sa_mcmember_rec rec;
2693         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
2694         ib_sa_comp_mask comp_mask;
2695         int ret;
2696
2697         ib_addr_get_mgid(dev_addr, &rec.mgid);
2698         ret = ib_sa_get_mcmember_rec(id_priv->id.device, id_priv->id.port_num,
2699                                      &rec.mgid, &rec);
2700         if (ret)
2701                 return ret;
2702
2703         cma_set_mgid(id_priv, (struct sockaddr *) &mc->addr, &rec.mgid);
2704         if (id_priv->id.ps == RDMA_PS_UDP)
2705                 rec.qkey = cpu_to_be32(RDMA_UDP_QKEY);
2706         ib_addr_get_sgid(dev_addr, &rec.port_gid);
2707         rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
2708         rec.join_state = 1;
2709
2710         comp_mask = IB_SA_MCMEMBER_REC_MGID | IB_SA_MCMEMBER_REC_PORT_GID |
2711                     IB_SA_MCMEMBER_REC_PKEY | IB_SA_MCMEMBER_REC_JOIN_STATE |
2712                     IB_SA_MCMEMBER_REC_QKEY | IB_SA_MCMEMBER_REC_SL |
2713                     IB_SA_MCMEMBER_REC_FLOW_LABEL |
2714                     IB_SA_MCMEMBER_REC_TRAFFIC_CLASS;
2715
2716         mc->multicast.ib = ib_sa_join_multicast(&sa_client, id_priv->id.device,
2717                                                 id_priv->id.port_num, &rec,
2718                                                 comp_mask, GFP_KERNEL,
2719                                                 cma_ib_mc_handler, mc);
2720         if (IS_ERR(mc->multicast.ib))
2721                 return PTR_ERR(mc->multicast.ib);
2722
2723         return 0;
2724 }
2725
2726 int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
2727                         void *context)
2728 {
2729         struct rdma_id_private *id_priv;
2730         struct cma_multicast *mc;
2731         int ret;
2732
2733         id_priv = container_of(id, struct rdma_id_private, id);
2734         if (!cma_comp(id_priv, CMA_ADDR_BOUND) &&
2735             !cma_comp(id_priv, CMA_ADDR_RESOLVED))
2736                 return -EINVAL;
2737
2738         mc = kmalloc(sizeof *mc, GFP_KERNEL);
2739         if (!mc)
2740                 return -ENOMEM;
2741
2742         memcpy(&mc->addr, addr, ip_addr_size(addr));
2743         mc->context = context;
2744         mc->id_priv = id_priv;
2745
2746         spin_lock(&id_priv->lock);
2747         list_add(&mc->list, &id_priv->mc_list);
2748         spin_unlock(&id_priv->lock);
2749
2750         switch (rdma_node_get_transport(id->device->node_type)) {
2751         case RDMA_TRANSPORT_IB:
2752                 ret = cma_join_ib_multicast(id_priv, mc);
2753                 break;
2754         default:
2755                 ret = -ENOSYS;
2756                 break;
2757         }
2758
2759         if (ret) {
2760                 spin_lock_irq(&id_priv->lock);
2761                 list_del(&mc->list);
2762                 spin_unlock_irq(&id_priv->lock);
2763                 kfree(mc);
2764         }
2765         return ret;
2766 }
2767 EXPORT_SYMBOL(rdma_join_multicast);
2768
2769 void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr)
2770 {
2771         struct rdma_id_private *id_priv;
2772         struct cma_multicast *mc;
2773
2774         id_priv = container_of(id, struct rdma_id_private, id);
2775         spin_lock_irq(&id_priv->lock);
2776         list_for_each_entry(mc, &id_priv->mc_list, list) {
2777                 if (!memcmp(&mc->addr, addr, ip_addr_size(addr))) {
2778                         list_del(&mc->list);
2779                         spin_unlock_irq(&id_priv->lock);
2780
2781                         if (id->qp)
2782                                 ib_detach_mcast(id->qp,
2783                                                 &mc->multicast.ib->rec.mgid,
2784                                                 mc->multicast.ib->rec.mlid);
2785                         ib_sa_free_multicast(mc->multicast.ib);
2786                         kfree(mc);
2787                         return;
2788                 }
2789         }
2790         spin_unlock_irq(&id_priv->lock);
2791 }
2792 EXPORT_SYMBOL(rdma_leave_multicast);
2793
2794 static int cma_netdev_change(struct net_device *ndev, struct rdma_id_private *id_priv)
2795 {
2796         struct rdma_dev_addr *dev_addr;
2797         struct cma_ndev_work *work;
2798
2799         dev_addr = &id_priv->id.route.addr.dev_addr;
2800
2801         if ((dev_addr->src_dev == ndev) &&
2802             memcmp(dev_addr->src_dev_addr, ndev->dev_addr, ndev->addr_len)) {
2803                 printk(KERN_INFO "RDMA CM addr change for ndev %s used by id %p\n",
2804                        ndev->name, &id_priv->id);
2805                 work = kzalloc(sizeof *work, GFP_KERNEL);
2806                 if (!work)
2807                         return -ENOMEM;
2808
2809                 INIT_WORK(&work->work, cma_ndev_work_handler);
2810                 work->id = id_priv;
2811                 work->event.event = RDMA_CM_EVENT_ADDR_CHANGE;
2812                 atomic_inc(&id_priv->refcount);
2813                 queue_work(cma_wq, &work->work);
2814         }
2815
2816         return 0;
2817 }
2818
2819 static int cma_netdev_callback(struct notifier_block *self, unsigned long event,
2820                                void *ctx)
2821 {
2822         struct net_device *ndev = (struct net_device *)ctx;
2823         struct cma_device *cma_dev;
2824         struct rdma_id_private *id_priv;
2825         int ret = NOTIFY_DONE;
2826
2827         if (dev_net(ndev) != &init_net)
2828                 return NOTIFY_DONE;
2829
2830         if (event != NETDEV_BONDING_FAILOVER)
2831                 return NOTIFY_DONE;
2832
2833         if (!(ndev->flags & IFF_MASTER) || !(ndev->priv_flags & IFF_BONDING))
2834                 return NOTIFY_DONE;
2835
2836         mutex_lock(&lock);
2837         list_for_each_entry(cma_dev, &dev_list, list)
2838                 list_for_each_entry(id_priv, &cma_dev->id_list, list) {
2839                         ret = cma_netdev_change(ndev, id_priv);
2840                         if (ret)
2841                                 goto out;
2842                 }
2843
2844 out:
2845         mutex_unlock(&lock);
2846         return ret;
2847 }
2848
2849 static struct notifier_block cma_nb = {
2850         .notifier_call = cma_netdev_callback
2851 };
2852
2853 static void cma_add_one(struct ib_device *device)
2854 {
2855         struct cma_device *cma_dev;
2856         struct rdma_id_private *id_priv;
2857
2858         cma_dev = kmalloc(sizeof *cma_dev, GFP_KERNEL);
2859         if (!cma_dev)
2860                 return;
2861
2862         cma_dev->device = device;
2863
2864         init_completion(&cma_dev->comp);
2865         atomic_set(&cma_dev->refcount, 1);
2866         INIT_LIST_HEAD(&cma_dev->id_list);
2867         ib_set_client_data(device, &cma_client, cma_dev);
2868
2869         mutex_lock(&lock);
2870         list_add_tail(&cma_dev->list, &dev_list);
2871         list_for_each_entry(id_priv, &listen_any_list, list)
2872                 cma_listen_on_dev(id_priv, cma_dev);
2873         mutex_unlock(&lock);
2874 }
2875
2876 static int cma_remove_id_dev(struct rdma_id_private *id_priv)
2877 {
2878         struct rdma_cm_event event;
2879         enum cma_state state;
2880         int ret = 0;
2881
2882         /* Record that we want to remove the device */
2883         state = cma_exch(id_priv, CMA_DEVICE_REMOVAL);
2884         if (state == CMA_DESTROYING)
2885                 return 0;
2886
2887         cma_cancel_operation(id_priv, state);
2888         mutex_lock(&id_priv->handler_mutex);
2889
2890         /* Check for destruction from another callback. */
2891         if (!cma_comp(id_priv, CMA_DEVICE_REMOVAL))
2892                 goto out;
2893
2894         memset(&event, 0, sizeof event);
2895         event.event = RDMA_CM_EVENT_DEVICE_REMOVAL;
2896         ret = id_priv->id.event_handler(&id_priv->id, &event);
2897 out:
2898         mutex_unlock(&id_priv->handler_mutex);
2899         return ret;
2900 }
2901
2902 static void cma_process_remove(struct cma_device *cma_dev)
2903 {
2904         struct rdma_id_private *id_priv;
2905         int ret;
2906
2907         mutex_lock(&lock);
2908         while (!list_empty(&cma_dev->id_list)) {
2909                 id_priv = list_entry(cma_dev->id_list.next,
2910                                      struct rdma_id_private, list);
2911
2912                 list_del(&id_priv->listen_list);
2913                 list_del_init(&id_priv->list);
2914                 atomic_inc(&id_priv->refcount);
2915                 mutex_unlock(&lock);
2916
2917                 ret = id_priv->internal_id ? 1 : cma_remove_id_dev(id_priv);
2918                 cma_deref_id(id_priv);
2919                 if (ret)
2920                         rdma_destroy_id(&id_priv->id);
2921
2922                 mutex_lock(&lock);
2923         }
2924         mutex_unlock(&lock);
2925
2926         cma_deref_dev(cma_dev);
2927         wait_for_completion(&cma_dev->comp);
2928 }
2929
2930 static void cma_remove_one(struct ib_device *device)
2931 {
2932         struct cma_device *cma_dev;
2933
2934         cma_dev = ib_get_client_data(device, &cma_client);
2935         if (!cma_dev)
2936                 return;
2937
2938         mutex_lock(&lock);
2939         list_del(&cma_dev->list);
2940         mutex_unlock(&lock);
2941
2942         cma_process_remove(cma_dev);
2943         kfree(cma_dev);
2944 }
2945
2946 static int cma_init(void)
2947 {
2948         int ret, low, high, remaining;
2949
2950         get_random_bytes(&next_port, sizeof next_port);
2951         inet_get_local_port_range(&low, &high);
2952         remaining = (high - low) + 1;
2953         next_port = ((unsigned int) next_port % remaining) + low;
2954
2955         cma_wq = create_singlethread_workqueue("rdma_cm");
2956         if (!cma_wq)
2957                 return -ENOMEM;
2958
2959         ib_sa_register_client(&sa_client);
2960         rdma_addr_register_client(&addr_client);
2961         register_netdevice_notifier(&cma_nb);
2962
2963         ret = ib_register_client(&cma_client);
2964         if (ret)
2965                 goto err;
2966         return 0;
2967
2968 err:
2969         unregister_netdevice_notifier(&cma_nb);
2970         rdma_addr_unregister_client(&addr_client);
2971         ib_sa_unregister_client(&sa_client);
2972         destroy_workqueue(cma_wq);
2973         return ret;
2974 }
2975
2976 static void cma_cleanup(void)
2977 {
2978         ib_unregister_client(&cma_client);
2979         unregister_netdevice_notifier(&cma_nb);
2980         rdma_addr_unregister_client(&addr_client);
2981         ib_sa_unregister_client(&sa_client);
2982         destroy_workqueue(cma_wq);
2983         idr_destroy(&sdp_ps);
2984         idr_destroy(&tcp_ps);
2985         idr_destroy(&udp_ps);
2986         idr_destroy(&ipoib_ps);
2987 }
2988
2989 module_init(cma_init);
2990 module_exit(cma_cleanup);