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 licensed under one of the following licenses:
   8  *
   9  * 1) under the terms of the "Common Public License 1.0" a copy of which is
  10  *    available from the Open Source Initiative, see
  11  *    http://www.opensource.org/licenses/cpl.php.
  12  *
  13  * 2) under the terms of the "The BSD License" a copy of which is
  14  *    available from the Open Source Initiative, see
  15  *    http://www.opensource.org/licenses/bsd-license.php.
  16  *
  17  * 3) under the terms of the "GNU General Public License (GPL) Version 2" a
  18  *    copy of which is available from the Open Source Initiative, see
  19  *    http://www.opensource.org/licenses/gpl-license.php.
  20  *
  21  * Licensee has the right to choose one of the above licenses.
  22  *
  23  * Redistributions of source code must retain the above copyright
  24  * notice and one of the license notices.
  25  *
  26  * Redistributions in binary form must reproduce both the above copyright
  27  * notice, one of the license notices in the documentation
  28  * and/or other materials provided with the distribution.
  29  *
  30  */
  31
  32 #include <linux/completion.h>
  33 #include <linux/in.h>
  34 #include <linux/in6.h>
  35 #include <linux/mutex.h>
  36 #include <linux/random.h>
  37 #include <linux/idr.h>
  38 #include <linux/inetdevice.h>
  39
  40 #include <net/tcp.h>
  41
  42 #include <rdma/rdma_cm.h>
  43 #include <rdma/rdma_cm_ib.h>
  44 #include <rdma/ib_cache.h>
  45 #include <rdma/ib_cm.h>
  46 #include <rdma/ib_sa.h>
  47 #include <rdma/iw_cm.h>
  48
  49 MODULE_AUTHOR("Sean Hefty");
  50 MODULE_DESCRIPTION("Generic RDMA CM Agent");
  51 MODULE_LICENSE("Dual BSD/GPL");
  52
  53 #define CMA_CM_RESPONSE_TIMEOUT 20
  54 #define CMA_MAX_CM_RETRIES 15
  55 #define CMA_CM_MRA_SETTING (IB_CM_MRA_FLAG_DELAY | 24)
  56
  57 static void cma_add_one(struct ib_device *device);
  58 static void cma_remove_one(struct ib_device *device);
  59
  60 static struct ib_client cma_client = {
  61         .name   = "cma",
  62         .add    = cma_add_one,
  63         .remove = cma_remove_one
  64 };
  65
  66 static struct ib_sa_client sa_client;
  67 static struct rdma_addr_client addr_client;
  68 static LIST_HEAD(dev_list);
  69 static LIST_HEAD(listen_any_list);
  70 static DEFINE_MUTEX(lock);
  71 static struct workqueue_struct *cma_wq;
  72 static DEFINE_IDR(sdp_ps);
  73 static DEFINE_IDR(tcp_ps);
  74 static DEFINE_IDR(udp_ps);
  75 static DEFINE_IDR(ipoib_ps);
  76 static int next_port;
  77
  78 struct cma_device {
  79         struct list_head        list;
  80         struct ib_device        *device;
  81         struct completion       comp;
  82         atomic_t                refcount;
  83         struct list_head        id_list;
  84 };
  85
  86 enum cma_state {
  87         CMA_IDLE,
  88         CMA_ADDR_QUERY,
  89         CMA_ADDR_RESOLVED,
  90         CMA_ROUTE_QUERY,
  91         CMA_ROUTE_RESOLVED,
  92         CMA_CONNECT,
  93         CMA_DISCONNECT,
  94         CMA_ADDR_BOUND,
  95         CMA_LISTEN,
  96         CMA_DEVICE_REMOVAL,
  97         CMA_DESTROYING
  98 };
  99
 100 struct rdma_bind_list {
 101         struct idr              *ps;
 102         struct hlist_head       owners;
 103         unsigned short          port;
 104 };
 105
 106 /*
 107  * Device removal can occur at anytime, so we need extra handling to
 108  * serialize notifying the user of device removal with other callbacks.
 109  * We do this by disabling removal notification while a callback is in process,
 110  * and reporting it after the callback completes.
 111  */
 112 struct rdma_id_private {
 113         struct rdma_cm_id       id;
 114
 115         struct rdma_bind_list   *bind_list;
 116         struct hlist_node       node;
 117         struct list_head        list; /* listen_any_list or cma_device.list */
 118         struct list_head        listen_list; /* per device listens */
 119         struct cma_device       *cma_dev;
 120         struct list_head        mc_list;
 121
 122         int                     internal_id;
 123         enum cma_state          state;
 124         spinlock_t              lock;
 125         struct mutex            qp_mutex;
 126
 127         struct completion       comp;
 128         atomic_t                refcount;
 129         wait_queue_head_t       wait_remove;
 130         atomic_t                dev_remove;
 131
 132         int                     backlog;
 133         int                     timeout_ms;
 134         struct ib_sa_query      *query;
 135         int                     query_id;
 136         union {
 137                 struct ib_cm_id *ib;
 138                 struct iw_cm_id *iw;
 139         } cm_id;
 140
 141         u32                     seq_num;
 142         u32                     qkey;
 143         u32                     qp_num;
 144         u8                      srq;
 145         u8                      tos;
 146 };
 147
 148 struct cma_multicast {
 149         struct rdma_id_private *id_priv;
 150         union {
 151                 struct ib_sa_multicast *ib;
 152         } multicast;
 153         struct list_head        list;
 154         void                    *context;
 155         struct sockaddr         addr;
 156         u8                      pad[sizeof(struct sockaddr_in6) -
 157                                     sizeof(struct sockaddr)];
 158 };
 159
 160 struct cma_work {
 161         struct work_struct      work;
 162         struct rdma_id_private  *id;
 163         enum cma_state          old_state;
 164         enum cma_state          new_state;
 165         struct rdma_cm_event    event;
 166 };
 167
 168 union cma_ip_addr {
 169         struct in6_addr ip6;
 170         struct {
 171                 __u32 pad[3];
 172                 __u32 addr;
 173         } ip4;
 174 };
 175
 176 struct cma_hdr {
 177         u8 cma_version;
 178         u8 ip_version;  /* IP version: 7:4 */
 179         __u16 port;
 180         union cma_ip_addr src_addr;
 181         union cma_ip_addr dst_addr;
 182 };
 183
 184 struct sdp_hh {
 185         u8 bsdh[16];
 186         u8 sdp_version; /* Major version: 7:4 */
 187         u8 ip_version;  /* IP version: 7:4 */
 188         u8 sdp_specific1[10];
 189         __u16 port;
 190         __u16 sdp_specific2;
 191         union cma_ip_addr src_addr;
 192         union cma_ip_addr dst_addr;
 193 };
 194
 195 struct sdp_hah {
 196         u8 bsdh[16];
 197         u8 sdp_version;
 198 };
 199
 200 #define CMA_VERSION 0x00
 201 #define SDP_MAJ_VERSION 0x2
 202
 203 static int cma_comp(struct rdma_id_private *id_priv, enum cma_state comp)
 204 {
 205         unsigned long flags;
 206         int ret;
 207
 208         spin_lock_irqsave(&id_priv->lock, flags);
 209         ret = (id_priv->state == comp);
 210         spin_unlock_irqrestore(&id_priv->lock, flags);
 211         return ret;
 212 }
 213
 214 static int cma_comp_exch(struct rdma_id_private *id_priv,
 215                          enum cma_state comp, enum cma_state exch)
 216 {
 217         unsigned long flags;
 218         int ret;
 219
 220         spin_lock_irqsave(&id_priv->lock, flags);
 221         if ((ret = (id_priv->state == comp)))
 222                 id_priv->state = exch;
 223         spin_unlock_irqrestore(&id_priv->lock, flags);
 224         return ret;
 225 }
 226
 227 static enum cma_state cma_exch(struct rdma_id_private *id_priv,
 228                                enum cma_state exch)
 229 {
 230         unsigned long flags;
 231         enum cma_state old;
 232
 233         spin_lock_irqsave(&id_priv->lock, flags);
 234         old = id_priv->state;
 235         id_priv->state = exch;
 236         spin_unlock_irqrestore(&id_priv->lock, flags);
 237         return old;
 238 }
 239
 240 static inline u8 cma_get_ip_ver(struct cma_hdr *hdr)
 241 {
 242         return hdr->ip_version >> 4;
 243 }
 244
 245 static inline void cma_set_ip_ver(struct cma_hdr *hdr, u8 ip_ver)
 246 {
 247         hdr->ip_version = (ip_ver << 4) | (hdr->ip_version & 0xF);
 248 }
 249
 250 static inline u8 sdp_get_majv(u8 sdp_version)
 251 {
 252         return sdp_version >> 4;
 253 }
 254
 255 static inline u8 sdp_get_ip_ver(struct sdp_hh *hh)
 256 {
 257         return hh->ip_version >> 4;
 258 }
 259
 260 static inline void sdp_set_ip_ver(struct sdp_hh *hh, u8 ip_ver)
 261 {
 262         hh->ip_version = (ip_ver << 4) | (hh->ip_version & 0xF);
 263 }
 264
 265 static inline int cma_is_ud_ps(enum rdma_port_space ps)
 266 {
 267         return (ps == RDMA_PS_UDP || ps == RDMA_PS_IPOIB);
 268 }
 269
 270 static void cma_attach_to_dev(struct rdma_id_private *id_priv,
 271                               struct cma_device *cma_dev)
 272 {
 273         atomic_inc(&cma_dev->refcount);
 274         id_priv->cma_dev = cma_dev;
 275         id_priv->id.device = cma_dev->device;
 276         list_add_tail(&id_priv->list, &cma_dev->id_list);
 277 }
 278
 279 static inline void cma_deref_dev(struct cma_device *cma_dev)
 280 {
 281         if (atomic_dec_and_test(&cma_dev->refcount))
 282                 complete(&cma_dev->comp);
 283 }
 284
 285 static void cma_detach_from_dev(struct rdma_id_private *id_priv)
 286 {
 287         list_del(&id_priv->list);
 288         cma_deref_dev(id_priv->cma_dev);
 289         id_priv->cma_dev = NULL;
 290 }
 291
 292 static int cma_set_qkey(struct ib_device *device, u8 port_num,
 293                         enum rdma_port_space ps,
 294                         struct rdma_dev_addr *dev_addr, u32 *qkey)
 295 {
 296         struct ib_sa_mcmember_rec rec;
 297         int ret = 0;
 298
 299         switch (ps) {
 300         case RDMA_PS_UDP:
 301                 *qkey = RDMA_UDP_QKEY;
 302                 break;
 303         case RDMA_PS_IPOIB:
 304                 ib_addr_get_mgid(dev_addr, &rec.mgid);
 305                 ret = ib_sa_get_mcmember_rec(device, port_num, &rec.mgid, &rec);
 306                 *qkey = be32_to_cpu(rec.qkey);
 307                 break;
 308         default:
 309                 break;
 310         }
 311         return ret;
 312 }
 313
 314 static int cma_acquire_dev(struct rdma_id_private *id_priv)
 315 {
 316         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
 317         struct cma_device *cma_dev;
 318         union ib_gid gid;
 319         int ret = -ENODEV;
 320
 321         switch (rdma_node_get_transport(dev_addr->dev_type)) {
 322         case RDMA_TRANSPORT_IB:
 323                 ib_addr_get_sgid(dev_addr, &gid);
 324                 break;
 325         case RDMA_TRANSPORT_IWARP:
 326                 iw_addr_get_sgid(dev_addr, &gid);
 327                 break;
 328         default:
 329                 return -ENODEV;
 330         }
 331
 332         list_for_each_entry(cma_dev, &dev_list, list) {
 333                 ret = ib_find_cached_gid(cma_dev->device, &gid,
 334                                          &id_priv->id.port_num, NULL);
 335                 if (!ret) {
 336                         ret = cma_set_qkey(cma_dev->device,
 337                                            id_priv->id.port_num,
 338                                            id_priv->id.ps, dev_addr,
 339                                            &id_priv->qkey);
 340                         if (!ret)
 341                                 cma_attach_to_dev(id_priv, cma_dev);
 342                         break;
 343                 }
 344         }
 345         return ret;
 346 }
 347
 348 static void cma_deref_id(struct rdma_id_private *id_priv)
 349 {
 350         if (atomic_dec_and_test(&id_priv->refcount))
 351                 complete(&id_priv->comp);
 352 }
 353
 354 static int cma_disable_remove(struct rdma_id_private *id_priv,
 355                               enum cma_state state)
 356 {
 357         unsigned long flags;
 358         int ret;
 359
 360         spin_lock_irqsave(&id_priv->lock, flags);
 361         if (id_priv->state == state) {
 362                 atomic_inc(&id_priv->dev_remove);
 363                 ret = 0;
 364         } else
 365                 ret = -EINVAL;
 366         spin_unlock_irqrestore(&id_priv->lock, flags);
 367         return ret;
 368 }
 369
 370 static void cma_enable_remove(struct rdma_id_private *id_priv)
 371 {
 372         if (atomic_dec_and_test(&id_priv->dev_remove))
 373                 wake_up(&id_priv->wait_remove);
 374 }
 375
 376 static int cma_has_cm_dev(struct rdma_id_private *id_priv)
 377 {
 378         return (id_priv->id.device && id_priv->cm_id.ib);
 379 }
 380
 381 struct rdma_cm_id *rdma_create_id(rdma_cm_event_handler event_handler,
 382                                   void *context, enum rdma_port_space ps)
 383 {
 384         struct rdma_id_private *id_priv;
 385
 386         id_priv = kzalloc(sizeof *id_priv, GFP_KERNEL);
 387         if (!id_priv)
 388                 return ERR_PTR(-ENOMEM);
 389
 390         id_priv->state = CMA_IDLE;
 391         id_priv->id.context = context;
 392         id_priv->id.event_handler = event_handler;
 393         id_priv->id.ps = ps;
 394         spin_lock_init(&id_priv->lock);
 395         mutex_init(&id_priv->qp_mutex);
 396         init_completion(&id_priv->comp);
 397         atomic_set(&id_priv->refcount, 1);
 398         init_waitqueue_head(&id_priv->wait_remove);
 399         atomic_set(&id_priv->dev_remove, 0);
 400         INIT_LIST_HEAD(&id_priv->listen_list);
 401         INIT_LIST_HEAD(&id_priv->mc_list);
 402         get_random_bytes(&id_priv->seq_num, sizeof id_priv->seq_num);
 403
 404         return &id_priv->id;
 405 }
 406 EXPORT_SYMBOL(rdma_create_id);
 407
 408 static int cma_init_ud_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
 409 {
 410         struct ib_qp_attr qp_attr;
 411         int qp_attr_mask, ret;
 412
 413         qp_attr.qp_state = IB_QPS_INIT;
 414         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 415         if (ret)
 416                 return ret;
 417
 418         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 419         if (ret)
 420                 return ret;
 421
 422         qp_attr.qp_state = IB_QPS_RTR;
 423         ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
 424         if (ret)
 425                 return ret;
 426
 427         qp_attr.qp_state = IB_QPS_RTS;
 428         qp_attr.sq_psn = 0;
 429         ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE | IB_QP_SQ_PSN);
 430
 431         return ret;
 432 }
 433
 434 static int cma_init_conn_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
 435 {
 436         struct ib_qp_attr qp_attr;
 437         int qp_attr_mask, ret;
 438
 439         qp_attr.qp_state = IB_QPS_INIT;
 440         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 441         if (ret)
 442                 return ret;
 443
 444         return ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 445 }
 446
 447 int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
 448                    struct ib_qp_init_attr *qp_init_attr)
 449 {
 450         struct rdma_id_private *id_priv;
 451         struct ib_qp *qp;
 452         int ret;
 453
 454         id_priv = container_of(id, struct rdma_id_private, id);
 455         if (id->device != pd->device)
 456                 return -EINVAL;
 457
 458         qp = ib_create_qp(pd, qp_init_attr);
 459         if (IS_ERR(qp))
 460                 return PTR_ERR(qp);
 461
 462         if (cma_is_ud_ps(id_priv->id.ps))
 463                 ret = cma_init_ud_qp(id_priv, qp);
 464         else
 465                 ret = cma_init_conn_qp(id_priv, qp);
 466         if (ret)
 467                 goto err;
 468
 469         id->qp = qp;
 470         id_priv->qp_num = qp->qp_num;
 471         id_priv->srq = (qp->srq != NULL);
 472         return 0;
 473 err:
 474         ib_destroy_qp(qp);
 475         return ret;
 476 }
 477 EXPORT_SYMBOL(rdma_create_qp);
 478
 479 void rdma_destroy_qp(struct rdma_cm_id *id)
 480 {
 481         struct rdma_id_private *id_priv;
 482
 483         id_priv = container_of(id, struct rdma_id_private, id);
 484         mutex_lock(&id_priv->qp_mutex);
 485         ib_destroy_qp(id_priv->id.qp);
 486         id_priv->id.qp = NULL;
 487         mutex_unlock(&id_priv->qp_mutex);
 488 }
 489 EXPORT_SYMBOL(rdma_destroy_qp);
 490
 491 static int cma_modify_qp_rtr(struct rdma_id_private *id_priv,
 492                              struct rdma_conn_param *conn_param)
 493 {
 494         struct ib_qp_attr qp_attr;
 495         int qp_attr_mask, ret;
 496
 497         mutex_lock(&id_priv->qp_mutex);
 498         if (!id_priv->id.qp) {
 499                 ret = 0;
 500                 goto out;
 501         }
 502
 503         /* Need to update QP attributes from default values. */
 504         qp_attr.qp_state = IB_QPS_INIT;
 505         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 506         if (ret)
 507                 goto out;
 508
 509         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
 510         if (ret)
 511                 goto out;
 512
 513         qp_attr.qp_state = IB_QPS_RTR;
 514         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 515         if (ret)
 516                 goto out;
 517
 518         if (conn_param)
 519                 qp_attr.max_dest_rd_atomic = conn_param->responder_resources;
 520         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
 521 out:
 522         mutex_unlock(&id_priv->qp_mutex);
 523         return ret;
 524 }
 525
 526 static int cma_modify_qp_rts(struct rdma_id_private *id_priv,
 527                              struct rdma_conn_param *conn_param)
 528 {
 529         struct ib_qp_attr qp_attr;
 530         int qp_attr_mask, ret;
 531
 532         mutex_lock(&id_priv->qp_mutex);
 533         if (!id_priv->id.qp) {
 534                 ret = 0;
 535                 goto out;
 536         }
 537
 538         qp_attr.qp_state = IB_QPS_RTS;
 539         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 540         if (ret)
 541                 goto out;
 542
 543         if (conn_param)
 544                 qp_attr.max_rd_atomic = conn_param->initiator_depth;
 545         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
 546 out:
 547         mutex_unlock(&id_priv->qp_mutex);
 548         return ret;
 549 }
 550
 551 static int cma_modify_qp_err(struct rdma_id_private *id_priv)
 552 {
 553         struct ib_qp_attr qp_attr;
 554         int ret;
 555
 556         mutex_lock(&id_priv->qp_mutex);
 557         if (!id_priv->id.qp) {
 558                 ret = 0;
 559                 goto out;
 560         }
 561
 562         qp_attr.qp_state = IB_QPS_ERR;
 563         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, IB_QP_STATE);
 564 out:
 565         mutex_unlock(&id_priv->qp_mutex);
 566         return ret;
 567 }
 568
 569 static int cma_ib_init_qp_attr(struct rdma_id_private *id_priv,
 570                                struct ib_qp_attr *qp_attr, int *qp_attr_mask)
 571 {
 572         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
 573         int ret;
 574
 575         ret = ib_find_cached_pkey(id_priv->id.device, id_priv->id.port_num,
 576                                   ib_addr_get_pkey(dev_addr),
 577                                   &qp_attr->pkey_index);
 578         if (ret)
 579                 return ret;
 580
 581         qp_attr->port_num = id_priv->id.port_num;
 582         *qp_attr_mask = IB_QP_STATE | IB_QP_PKEY_INDEX | IB_QP_PORT;
 583
 584         if (cma_is_ud_ps(id_priv->id.ps)) {
 585                 qp_attr->qkey = id_priv->qkey;
 586                 *qp_attr_mask |= IB_QP_QKEY;
 587         } else {
 588                 qp_attr->qp_access_flags = 0;
 589                 *qp_attr_mask |= IB_QP_ACCESS_FLAGS;
 590         }
 591         return 0;
 592 }
 593
 594 int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
 595                        int *qp_attr_mask)
 596 {
 597         struct rdma_id_private *id_priv;
 598         int ret = 0;
 599
 600         id_priv = container_of(id, struct rdma_id_private, id);
 601         switch (rdma_node_get_transport(id_priv->id.device->node_type)) {
 602         case RDMA_TRANSPORT_IB:
 603                 if (!id_priv->cm_id.ib || cma_is_ud_ps(id_priv->id.ps))
 604                         ret = cma_ib_init_qp_attr(id_priv, qp_attr, qp_attr_mask);
 605                 else
 606                         ret = ib_cm_init_qp_attr(id_priv->cm_id.ib, qp_attr,
 607                                                  qp_attr_mask);
 608                 if (qp_attr->qp_state == IB_QPS_RTR)
 609                         qp_attr->rq_psn = id_priv->seq_num;
 610                 break;
 611         case RDMA_TRANSPORT_IWARP:
 612                 if (!id_priv->cm_id.iw) {
 613                         qp_attr->qp_access_flags = 0;
 614                         *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS;
 615                 } else
 616                         ret = iw_cm_init_qp_attr(id_priv->cm_id.iw, qp_attr,
 617                                                  qp_attr_mask);
 618                 break;
 619         default:
 620                 ret = -ENOSYS;
 621                 break;
 622         }
 623
 624         return ret;
 625 }
 626 EXPORT_SYMBOL(rdma_init_qp_attr);
 627
 628 static inline int cma_zero_addr(struct sockaddr *addr)
 629 {
 630         struct in6_addr *ip6;
 631
 632         if (addr->sa_family == AF_INET)
 633                 return ipv4_is_zeronet(
 634                         ((struct sockaddr_in *)addr)->sin_addr.s_addr);
 635         else {
 636                 ip6 = &((struct sockaddr_in6 *) addr)->sin6_addr;
 637                 return (ip6->s6_addr32[0] | ip6->s6_addr32[1] |
 638                         ip6->s6_addr32[2] | ip6->s6_addr32[3]) == 0;
 639         }
 640 }
 641
 642 static inline int cma_loopback_addr(struct sockaddr *addr)
 643 {
 644         return ipv4_is_loopback(((struct sockaddr_in *) addr)->sin_addr.s_addr);
 645 }
 646
 647 static inline int cma_any_addr(struct sockaddr *addr)
 648 {
 649         return cma_zero_addr(addr) || cma_loopback_addr(addr);
 650 }
 651
 652 static inline __be16 cma_port(struct sockaddr *addr)
 653 {
 654         if (addr->sa_family == AF_INET)
 655                 return ((struct sockaddr_in *) addr)->sin_port;
 656         else
 657                 return ((struct sockaddr_in6 *) addr)->sin6_port;
 658 }
 659
 660 static inline int cma_any_port(struct sockaddr *addr)
 661 {
 662         return !cma_port(addr);
 663 }
 664
 665 static int cma_get_net_info(void *hdr, enum rdma_port_space ps,
 666                             u8 *ip_ver, __u16 *port,
 667                             union cma_ip_addr **src, union cma_ip_addr **dst)
 668 {
 669         switch (ps) {
 670         case RDMA_PS_SDP:
 671                 if (sdp_get_majv(((struct sdp_hh *) hdr)->sdp_version) !=
 672                     SDP_MAJ_VERSION)
 673                         return -EINVAL;
 674
 675                 *ip_ver = sdp_get_ip_ver(hdr);
 676                 *port   = ((struct sdp_hh *) hdr)->port;
 677                 *src    = &((struct sdp_hh *) hdr)->src_addr;
 678                 *dst    = &((struct sdp_hh *) hdr)->dst_addr;
 679                 break;
 680         default:
 681                 if (((struct cma_hdr *) hdr)->cma_version != CMA_VERSION)
 682                         return -EINVAL;
 683
 684                 *ip_ver = cma_get_ip_ver(hdr);
 685                 *port   = ((struct cma_hdr *) hdr)->port;
 686                 *src    = &((struct cma_hdr *) hdr)->src_addr;
 687                 *dst    = &((struct cma_hdr *) hdr)->dst_addr;
 688                 break;
 689         }
 690
 691         if (*ip_ver != 4 && *ip_ver != 6)
 692                 return -EINVAL;
 693         return 0;
 694 }
 695
 696 static void cma_save_net_info(struct rdma_addr *addr,
 697                               struct rdma_addr *listen_addr,
 698                               u8 ip_ver, __u16 port,
 699                               union cma_ip_addr *src, union cma_ip_addr *dst)
 700 {
 701         struct sockaddr_in *listen4, *ip4;
 702         struct sockaddr_in6 *listen6, *ip6;
 703
 704         switch (ip_ver) {
 705         case 4:
 706                 listen4 = (struct sockaddr_in *) &listen_addr->src_addr;
 707                 ip4 = (struct sockaddr_in *) &addr->src_addr;
 708                 ip4->sin_family = listen4->sin_family;
 709                 ip4->sin_addr.s_addr = dst->ip4.addr;
 710                 ip4->sin_port = listen4->sin_port;
 711
 712                 ip4 = (struct sockaddr_in *) &addr->dst_addr;
 713                 ip4->sin_family = listen4->sin_family;
 714                 ip4->sin_addr.s_addr = src->ip4.addr;
 715                 ip4->sin_port = port;
 716                 break;
 717         case 6:
 718                 listen6 = (struct sockaddr_in6 *) &listen_addr->src_addr;
 719                 ip6 = (struct sockaddr_in6 *) &addr->src_addr;
 720                 ip6->sin6_family = listen6->sin6_family;
 721                 ip6->sin6_addr = dst->ip6;
 722                 ip6->sin6_port = listen6->sin6_port;
 723
 724                 ip6 = (struct sockaddr_in6 *) &addr->dst_addr;
 725                 ip6->sin6_family = listen6->sin6_family;
 726                 ip6->sin6_addr = src->ip6;
 727                 ip6->sin6_port = port;
 728                 break;
 729         default:
 730                 break;
 731         }
 732 }
 733
 734 static inline int cma_user_data_offset(enum rdma_port_space ps)
 735 {
 736         switch (ps) {
 737         case RDMA_PS_SDP:
 738                 return 0;
 739         default:
 740                 return sizeof(struct cma_hdr);
 741         }
 742 }
 743
 744 static void cma_cancel_route(struct rdma_id_private *id_priv)
 745 {
 746         switch (rdma_node_get_transport(id_priv->id.device->node_type)) {
 747         case RDMA_TRANSPORT_IB:
 748                 if (id_priv->query)
 749                         ib_sa_cancel_query(id_priv->query_id, id_priv->query);
 750                 break;
 751         default:
 752                 break;
 753         }
 754 }
 755
 756 static void cma_cancel_listens(struct rdma_id_private *id_priv)
 757 {
 758         struct rdma_id_private *dev_id_priv;
 759
 760         /*
 761          * Remove from listen_any_list to prevent added devices from spawning
 762          * additional listen requests.
 763          */
 764         mutex_lock(&lock);
 765         list_del(&id_priv->list);
 766
 767         while (!list_empty(&id_priv->listen_list)) {
 768                 dev_id_priv = list_entry(id_priv->listen_list.next,
 769                                          struct rdma_id_private, listen_list);
 770                 /* sync with device removal to avoid duplicate destruction */
 771                 list_del_init(&dev_id_priv->list);
 772                 list_del(&dev_id_priv->listen_list);
 773                 mutex_unlock(&lock);
 774
 775                 rdma_destroy_id(&dev_id_priv->id);
 776                 mutex_lock(&lock);
 777         }
 778         mutex_unlock(&lock);
 779 }
 780
 781 static void cma_cancel_operation(struct rdma_id_private *id_priv,
 782                                  enum cma_state state)
 783 {
 784         switch (state) {
 785         case CMA_ADDR_QUERY:
 786                 rdma_addr_cancel(&id_priv->id.route.addr.dev_addr);
 787                 break;
 788         case CMA_ROUTE_QUERY:
 789                 cma_cancel_route(id_priv);
 790                 break;
 791         case CMA_LISTEN:
 792                 if (cma_any_addr(&id_priv->id.route.addr.src_addr) &&
 793                     !id_priv->cma_dev)
 794                         cma_cancel_listens(id_priv);
 795                 break;
 796         default:
 797                 break;
 798         }
 799 }
 800
 801 static void cma_release_port(struct rdma_id_private *id_priv)
 802 {
 803         struct rdma_bind_list *bind_list = id_priv->bind_list;
 804
 805         if (!bind_list)
 806                 return;
 807
 808         mutex_lock(&lock);
 809         hlist_del(&id_priv->node);
 810         if (hlist_empty(&bind_list->owners)) {
 811                 idr_remove(bind_list->ps, bind_list->port);
 812                 kfree(bind_list);
 813         }
 814         mutex_unlock(&lock);
 815 }
 816
 817 static void cma_leave_mc_groups(struct rdma_id_private *id_priv)
 818 {
 819         struct cma_multicast *mc;
 820
 821         while (!list_empty(&id_priv->mc_list)) {
 822                 mc = container_of(id_priv->mc_list.next,
 823                                   struct cma_multicast, list);
 824                 list_del(&mc->list);
 825                 ib_sa_free_multicast(mc->multicast.ib);
 826                 kfree(mc);
 827         }
 828 }
 829
 830 void rdma_destroy_id(struct rdma_cm_id *id)
 831 {
 832         struct rdma_id_private *id_priv;
 833         enum cma_state state;
 834
 835         id_priv = container_of(id, struct rdma_id_private, id);
 836         state = cma_exch(id_priv, CMA_DESTROYING);
 837         cma_cancel_operation(id_priv, state);
 838
 839         mutex_lock(&lock);
 840         if (id_priv->cma_dev) {
 841                 mutex_unlock(&lock);
 842                 switch (rdma_node_get_transport(id->device->node_type)) {
 843                 case RDMA_TRANSPORT_IB:
 844                         if (id_priv->cm_id.ib && !IS_ERR(id_priv->cm_id.ib))
 845                                 ib_destroy_cm_id(id_priv->cm_id.ib);
 846                         break;
 847                 case RDMA_TRANSPORT_IWARP:
 848                         if (id_priv->cm_id.iw && !IS_ERR(id_priv->cm_id.iw))
 849                                 iw_destroy_cm_id(id_priv->cm_id.iw);
 850                         break;
 851                 default:
 852                         break;
 853                 }
 854                 cma_leave_mc_groups(id_priv);
 855                 mutex_lock(&lock);
 856                 cma_detach_from_dev(id_priv);
 857         }
 858         mutex_unlock(&lock);
 859
 860         cma_release_port(id_priv);
 861         cma_deref_id(id_priv);
 862         wait_for_completion(&id_priv->comp);
 863
 864         if (id_priv->internal_id)
 865                 cma_deref_id(id_priv->id.context);
 866
 867         kfree(id_priv->id.route.path_rec);
 868         kfree(id_priv);
 869 }
 870 EXPORT_SYMBOL(rdma_destroy_id);
 871
 872 static int cma_rep_recv(struct rdma_id_private *id_priv)
 873 {
 874         int ret;
 875
 876         ret = cma_modify_qp_rtr(id_priv, NULL);
 877         if (ret)
 878                 goto reject;
 879
 880         ret = cma_modify_qp_rts(id_priv, NULL);
 881         if (ret)
 882                 goto reject;
 883
 884         ret = ib_send_cm_rtu(id_priv->cm_id.ib, NULL, 0);
 885         if (ret)
 886                 goto reject;
 887
 888         return 0;
 889 reject:
 890         cma_modify_qp_err(id_priv);
 891         ib_send_cm_rej(id_priv->cm_id.ib, IB_CM_REJ_CONSUMER_DEFINED,
 892                        NULL, 0, NULL, 0);
 893         return ret;
 894 }
 895
 896 static int cma_verify_rep(struct rdma_id_private *id_priv, void *data)
 897 {
 898         if (id_priv->id.ps == RDMA_PS_SDP &&
 899             sdp_get_majv(((struct sdp_hah *) data)->sdp_version) !=
 900             SDP_MAJ_VERSION)
 901                 return -EINVAL;
 902
 903         return 0;
 904 }
 905
 906 static void cma_set_rep_event_data(struct rdma_cm_event *event,
 907                                    struct ib_cm_rep_event_param *rep_data,
 908                                    void *private_data)
 909 {
 910         event->param.conn.private_data = private_data;
 911         event->param.conn.private_data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
 912         event->param.conn.responder_resources = rep_data->responder_resources;
 913         event->param.conn.initiator_depth = rep_data->initiator_depth;
 914         event->param.conn.flow_control = rep_data->flow_control;
 915         event->param.conn.rnr_retry_count = rep_data->rnr_retry_count;
 916         event->param.conn.srq = rep_data->srq;
 917         event->param.conn.qp_num = rep_data->remote_qpn;
 918 }
 919
 920 static int cma_ib_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
 921 {
 922         struct rdma_id_private *id_priv = cm_id->context;
 923         struct rdma_cm_event event;
 924         int ret = 0;
 925
 926         if (cma_disable_remove(id_priv, CMA_CONNECT))
 927                 return 0;
 928
 929         memset(&event, 0, sizeof event);
 930         switch (ib_event->event) {
 931         case IB_CM_REQ_ERROR:
 932         case IB_CM_REP_ERROR:
 933                 event.event = RDMA_CM_EVENT_UNREACHABLE;
 934                 event.status = -ETIMEDOUT;
 935                 break;
 936         case IB_CM_REP_RECEIVED:
 937                 event.status = cma_verify_rep(id_priv, ib_event->private_data);
 938                 if (event.status)
 939                         event.event = RDMA_CM_EVENT_CONNECT_ERROR;
 940                 else if (id_priv->id.qp && id_priv->id.ps != RDMA_PS_SDP) {
 941                         event.status = cma_rep_recv(id_priv);
 942                         event.event = event.status ? RDMA_CM_EVENT_CONNECT_ERROR :
 943                                                      RDMA_CM_EVENT_ESTABLISHED;
 944                 } else
 945                         event.event = RDMA_CM_EVENT_CONNECT_RESPONSE;
 946                 cma_set_rep_event_data(&event, &ib_event->param.rep_rcvd,
 947                                        ib_event->private_data);
 948                 break;
 949         case IB_CM_RTU_RECEIVED:
 950         case IB_CM_USER_ESTABLISHED:
 951                 event.event = RDMA_CM_EVENT_ESTABLISHED;
 952                 break;
 953         case IB_CM_DREQ_ERROR:
 954                 event.status = -ETIMEDOUT; /* fall through */
 955         case IB_CM_DREQ_RECEIVED:
 956         case IB_CM_DREP_RECEIVED:
 957                 if (!cma_comp_exch(id_priv, CMA_CONNECT, CMA_DISCONNECT))
 958                         goto out;
 959                 event.event = RDMA_CM_EVENT_DISCONNECTED;
 960                 break;
 961         case IB_CM_TIMEWAIT_EXIT:
 962         case IB_CM_MRA_RECEIVED:
 963                 /* ignore event */
 964                 goto out;
 965         case IB_CM_REJ_RECEIVED:
 966                 cma_modify_qp_err(id_priv);
 967                 event.status = ib_event->param.rej_rcvd.reason;
 968                 event.event = RDMA_CM_EVENT_REJECTED;
 969                 event.param.conn.private_data = ib_event->private_data;
 970                 event.param.conn.private_data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
 971                 break;
 972         default:
 973                 printk(KERN_ERR "RDMA CMA: unexpected IB CM event: %d",
 974                        ib_event->event);
 975                 goto out;
 976         }
 977
 978         ret = id_priv->id.event_handler(&id_priv->id, &event);
 979         if (ret) {
 980                 /* Destroy the CM ID by returning a non-zero value. */
 981                 id_priv->cm_id.ib = NULL;
 982                 cma_exch(id_priv, CMA_DESTROYING);
 983                 cma_enable_remove(id_priv);
 984                 rdma_destroy_id(&id_priv->id);
 985                 return ret;
 986         }
 987 out:
 988         cma_enable_remove(id_priv);
 989         return ret;
 990 }
 991
 992 static struct rdma_id_private *cma_new_conn_id(struct rdma_cm_id *listen_id,
 993                                                struct ib_cm_event *ib_event)
 994 {
 995         struct rdma_id_private *id_priv;
 996         struct rdma_cm_id *id;
 997         struct rdma_route *rt;
 998         union cma_ip_addr *src, *dst;
 999         __u16 port;
1000         u8 ip_ver;
1001
1002         if (cma_get_net_info(ib_event->private_data, listen_id->ps,
1003                              &ip_ver, &port, &src, &dst))
1004                 goto err;
1005
1006         id = rdma_create_id(listen_id->event_handler, listen_id->context,
1007                             listen_id->ps);
1008         if (IS_ERR(id))
1009                 goto err;
1010
1011         cma_save_net_info(&id->route.addr, &listen_id->route.addr,
1012                           ip_ver, port, src, dst);
1013
1014         rt = &id->route;
1015         rt->num_paths = ib_event->param.req_rcvd.alternate_path ? 2 : 1;
1016         rt->path_rec = kmalloc(sizeof *rt->path_rec * rt->num_paths,
1017                                GFP_KERNEL);
1018         if (!rt->path_rec)
1019                 goto destroy_id;
1020
1021         rt->path_rec[0] = *ib_event->param.req_rcvd.primary_path;
1022         if (rt->num_paths == 2)
1023                 rt->path_rec[1] = *ib_event->param.req_rcvd.alternate_path;
1024
1025         ib_addr_set_sgid(&rt->addr.dev_addr, &rt->path_rec[0].sgid);
1026         ib_addr_set_dgid(&rt->addr.dev_addr, &rt->path_rec[0].dgid);
1027         ib_addr_set_pkey(&rt->addr.dev_addr, be16_to_cpu(rt->path_rec[0].pkey));
1028         rt->addr.dev_addr.dev_type = RDMA_NODE_IB_CA;
1029
1030         id_priv = container_of(id, struct rdma_id_private, id);
1031         id_priv->state = CMA_CONNECT;
1032         return id_priv;
1033
1034 destroy_id:
1035         rdma_destroy_id(id);
1036 err:
1037         return NULL;
1038 }
1039
1040 static struct rdma_id_private *cma_new_udp_id(struct rdma_cm_id *listen_id,
1041                                               struct ib_cm_event *ib_event)
1042 {
1043         struct rdma_id_private *id_priv;
1044         struct rdma_cm_id *id;
1045         union cma_ip_addr *src, *dst;
1046         __u16 port;
1047         u8 ip_ver;
1048         int ret;
1049
1050         id = rdma_create_id(listen_id->event_handler, listen_id->context,
1051                             listen_id->ps);
1052         if (IS_ERR(id))
1053                 return NULL;
1054
1055
1056         if (cma_get_net_info(ib_event->private_data, listen_id->ps,
1057                              &ip_ver, &port, &src, &dst))
1058                 goto err;
1059
1060         cma_save_net_info(&id->route.addr, &listen_id->route.addr,
1061                           ip_ver, port, src, dst);
1062
1063         ret = rdma_translate_ip(&id->route.addr.src_addr,
1064                                 &id->route.addr.dev_addr);
1065         if (ret)
1066                 goto err;
1067
1068         id_priv = container_of(id, struct rdma_id_private, id);
1069         id_priv->state = CMA_CONNECT;
1070         return id_priv;
1071 err:
1072         rdma_destroy_id(id);
1073         return NULL;
1074 }
1075
1076 static void cma_set_req_event_data(struct rdma_cm_event *event,
1077                                    struct ib_cm_req_event_param *req_data,
1078                                    void *private_data, int offset)
1079 {
1080         event->param.conn.private_data = private_data + offset;
1081         event->param.conn.private_data_len = IB_CM_REQ_PRIVATE_DATA_SIZE - offset;
1082         event->param.conn.responder_resources = req_data->responder_resources;
1083         event->param.conn.initiator_depth = req_data->initiator_depth;
1084         event->param.conn.flow_control = req_data->flow_control;
1085         event->param.conn.retry_count = req_data->retry_count;
1086         event->param.conn.rnr_retry_count = req_data->rnr_retry_count;
1087         event->param.conn.srq = req_data->srq;
1088         event->param.conn.qp_num = req_data->remote_qpn;
1089 }
1090
1091 static int cma_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
1092 {
1093         struct rdma_id_private *listen_id, *conn_id;
1094         struct rdma_cm_event event;
1095         int offset, ret;
1096
1097         listen_id = cm_id->context;
1098         if (cma_disable_remove(listen_id, CMA_LISTEN))
1099                 return -ECONNABORTED;
1100
1101         memset(&event, 0, sizeof event);
1102         offset = cma_user_data_offset(listen_id->id.ps);
1103         event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
1104         if (cma_is_ud_ps(listen_id->id.ps)) {
1105                 conn_id = cma_new_udp_id(&listen_id->id, ib_event);
1106                 event.param.ud.private_data = ib_event->private_data + offset;
1107                 event.param.ud.private_data_len =
1108                                 IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE - offset;
1109         } else {
1110                 ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
1111                 conn_id = cma_new_conn_id(&listen_id->id, ib_event);
1112                 cma_set_req_event_data(&event, &ib_event->param.req_rcvd,
1113                                        ib_event->private_data, offset);
1114         }
1115         if (!conn_id) {
1116                 ret = -ENOMEM;
1117                 goto out;
1118         }
1119
1120         atomic_inc(&conn_id->dev_remove);
1121         mutex_lock(&lock);
1122         ret = cma_acquire_dev(conn_id);
1123         mutex_unlock(&lock);
1124         if (ret)
1125                 goto release_conn_id;
1126
1127         conn_id->cm_id.ib = cm_id;
1128         cm_id->context = conn_id;
1129         cm_id->cm_handler = cma_ib_handler;
1130
1131         ret = conn_id->id.event_handler(&conn_id->id, &event);
1132         if (!ret) {
1133                 cma_enable_remove(conn_id);
1134                 goto out;
1135         }
1136
1137         /* Destroy the CM ID by returning a non-zero value. */
1138         conn_id->cm_id.ib = NULL;
1139
1140 release_conn_id:
1141         cma_exch(conn_id, CMA_DESTROYING);
1142         cma_enable_remove(conn_id);
1143         rdma_destroy_id(&conn_id->id);
1144
1145 out:
1146         cma_enable_remove(listen_id);
1147         return ret;
1148 }
1149
1150 static __be64 cma_get_service_id(enum rdma_port_space ps, struct sockaddr *addr)
1151 {
1152         return cpu_to_be64(((u64)ps << 16) + be16_to_cpu(cma_port(addr)));
1153 }
1154
1155 static void cma_set_compare_data(enum rdma_port_space ps, struct sockaddr *addr,
1156                                  struct ib_cm_compare_data *compare)
1157 {
1158         struct cma_hdr *cma_data, *cma_mask;
1159         struct sdp_hh *sdp_data, *sdp_mask;
1160         __u32 ip4_addr;
1161         struct in6_addr ip6_addr;
1162
1163         memset(compare, 0, sizeof *compare);
1164         cma_data = (void *) compare->data;
1165         cma_mask = (void *) compare->mask;
1166         sdp_data = (void *) compare->data;
1167         sdp_mask = (void *) compare->mask;
1168
1169         switch (addr->sa_family) {
1170         case AF_INET:
1171                 ip4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
1172                 if (ps == RDMA_PS_SDP) {
1173                         sdp_set_ip_ver(sdp_data, 4);
1174                         sdp_set_ip_ver(sdp_mask, 0xF);
1175                         sdp_data->dst_addr.ip4.addr = ip4_addr;
1176                         sdp_mask->dst_addr.ip4.addr = ~0;
1177                 } else {
1178                         cma_set_ip_ver(cma_data, 4);
1179                         cma_set_ip_ver(cma_mask, 0xF);
1180                         cma_data->dst_addr.ip4.addr = ip4_addr;
1181                         cma_mask->dst_addr.ip4.addr = ~0;
1182                 }
1183                 break;
1184         case AF_INET6:
1185                 ip6_addr = ((struct sockaddr_in6 *) addr)->sin6_addr;
1186                 if (ps == RDMA_PS_SDP) {
1187                         sdp_set_ip_ver(sdp_data, 6);
1188                         sdp_set_ip_ver(sdp_mask, 0xF);
1189                         sdp_data->dst_addr.ip6 = ip6_addr;
1190                         memset(&sdp_mask->dst_addr.ip6, 0xFF,
1191                                sizeof sdp_mask->dst_addr.ip6);
1192                 } else {
1193                         cma_set_ip_ver(cma_data, 6);
1194                         cma_set_ip_ver(cma_mask, 0xF);
1195                         cma_data->dst_addr.ip6 = ip6_addr;
1196                         memset(&cma_mask->dst_addr.ip6, 0xFF,
1197                                sizeof cma_mask->dst_addr.ip6);
1198                 }
1199                 break;
1200         default:
1201                 break;
1202         }
1203 }
1204
1205 static int cma_iw_handler(struct iw_cm_id *iw_id, struct iw_cm_event *iw_event)
1206 {
1207         struct rdma_id_private *id_priv = iw_id->context;
1208         struct rdma_cm_event event;
1209         struct sockaddr_in *sin;
1210         int ret = 0;
1211
1212         if (cma_disable_remove(id_priv, CMA_CONNECT))
1213                 return 0;
1214
1215         memset(&event, 0, sizeof event);
1216         switch (iw_event->event) {
1217         case IW_CM_EVENT_CLOSE:
1218                 event.event = RDMA_CM_EVENT_DISCONNECTED;
1219                 break;
1220         case IW_CM_EVENT_CONNECT_REPLY:
1221                 sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1222                 *sin = iw_event->local_addr;
1223                 sin = (struct sockaddr_in *) &id_priv->id.route.addr.dst_addr;
1224                 *sin = iw_event->remote_addr;
1225                 switch (iw_event->status) {
1226                 case 0:
1227                         event.event = RDMA_CM_EVENT_ESTABLISHED;
1228                         break;
1229                 case -ECONNRESET:
1230                 case -ECONNREFUSED:
1231                         event.event = RDMA_CM_EVENT_REJECTED;
1232                         break;
1233                 case -ETIMEDOUT:
1234                         event.event = RDMA_CM_EVENT_UNREACHABLE;
1235                         break;
1236                 default:
1237                         event.event = RDMA_CM_EVENT_CONNECT_ERROR;
1238                         break;
1239                 }
1240                 break;
1241         case IW_CM_EVENT_ESTABLISHED:
1242                 event.event = RDMA_CM_EVENT_ESTABLISHED;
1243                 break;
1244         default:
1245                 BUG_ON(1);
1246         }
1247
1248         event.status = iw_event->status;
1249         event.param.conn.private_data = iw_event->private_data;
1250         event.param.conn.private_data_len = iw_event->private_data_len;
1251         ret = id_priv->id.event_handler(&id_priv->id, &event);
1252         if (ret) {
1253                 /* Destroy the CM ID by returning a non-zero value. */
1254                 id_priv->cm_id.iw = NULL;
1255                 cma_exch(id_priv, CMA_DESTROYING);
1256                 cma_enable_remove(id_priv);
1257                 rdma_destroy_id(&id_priv->id);
1258                 return ret;
1259         }
1260
1261         cma_enable_remove(id_priv);
1262         return ret;
1263 }
1264
1265 static int iw_conn_req_handler(struct iw_cm_id *cm_id,
1266                                struct iw_cm_event *iw_event)
1267 {
1268         struct rdma_cm_id *new_cm_id;
1269         struct rdma_id_private *listen_id, *conn_id;
1270         struct sockaddr_in *sin;
1271         struct net_device *dev = NULL;
1272         struct rdma_cm_event event;
1273         int ret;
1274         struct ib_device_attr attr;
1275
1276         listen_id = cm_id->context;
1277         if (cma_disable_remove(listen_id, CMA_LISTEN))
1278                 return -ECONNABORTED;
1279
1280         /* Create a new RDMA id for the new IW CM ID */
1281         new_cm_id = rdma_create_id(listen_id->id.event_handler,
1282                                    listen_id->id.context,
1283                                    RDMA_PS_TCP);
1284         if (!new_cm_id) {
1285                 ret = -ENOMEM;
1286                 goto out;
1287         }
1288         conn_id = container_of(new_cm_id, struct rdma_id_private, id);
1289         atomic_inc(&conn_id->dev_remove);
1290         conn_id->state = CMA_CONNECT;
1291
1292         dev = ip_dev_find(&init_net, iw_event->local_addr.sin_addr.s_addr);
1293         if (!dev) {
1294                 ret = -EADDRNOTAVAIL;
1295                 cma_enable_remove(conn_id);
1296                 rdma_destroy_id(new_cm_id);
1297                 goto out;
1298         }
1299         ret = rdma_copy_addr(&conn_id->id.route.addr.dev_addr, dev, NULL);
1300         if (ret) {
1301                 cma_enable_remove(conn_id);
1302                 rdma_destroy_id(new_cm_id);
1303                 goto out;
1304         }
1305
1306         mutex_lock(&lock);
1307         ret = cma_acquire_dev(conn_id);
1308         mutex_unlock(&lock);
1309         if (ret) {
1310                 cma_enable_remove(conn_id);
1311                 rdma_destroy_id(new_cm_id);
1312                 goto out;
1313         }
1314
1315         conn_id->cm_id.iw = cm_id;
1316         cm_id->context = conn_id;
1317         cm_id->cm_handler = cma_iw_handler;
1318
1319         sin = (struct sockaddr_in *) &new_cm_id->route.addr.src_addr;
1320         *sin = iw_event->local_addr;
1321         sin = (struct sockaddr_in *) &new_cm_id->route.addr.dst_addr;
1322         *sin = iw_event->remote_addr;
1323
1324         ret = ib_query_device(conn_id->id.device, &attr);
1325         if (ret) {
1326                 cma_enable_remove(conn_id);
1327                 rdma_destroy_id(new_cm_id);
1328                 goto out;
1329         }
1330
1331         memset(&event, 0, sizeof event);
1332         event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
1333         event.param.conn.private_data = iw_event->private_data;
1334         event.param.conn.private_data_len = iw_event->private_data_len;
1335         event.param.conn.initiator_depth = attr.max_qp_init_rd_atom;
1336         event.param.conn.responder_resources = attr.max_qp_rd_atom;
1337         ret = conn_id->id.event_handler(&conn_id->id, &event);
1338         if (ret) {
1339                 /* User wants to destroy the CM ID */
1340                 conn_id->cm_id.iw = NULL;
1341                 cma_exch(conn_id, CMA_DESTROYING);
1342                 cma_enable_remove(conn_id);
1343                 rdma_destroy_id(&conn_id->id);
1344         }
1345
1346 out:
1347         if (dev)
1348                 dev_put(dev);
1349         cma_enable_remove(listen_id);
1350         return ret;
1351 }
1352
1353 static int cma_ib_listen(struct rdma_id_private *id_priv)
1354 {
1355         struct ib_cm_compare_data compare_data;
1356         struct sockaddr *addr;
1357         __be64 svc_id;
1358         int ret;
1359
1360         id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device, cma_req_handler,
1361                                             id_priv);
1362         if (IS_ERR(id_priv->cm_id.ib))
1363                 return PTR_ERR(id_priv->cm_id.ib);
1364
1365         addr = &id_priv->id.route.addr.src_addr;
1366         svc_id = cma_get_service_id(id_priv->id.ps, addr);
1367         if (cma_any_addr(addr))
1368                 ret = ib_cm_listen(id_priv->cm_id.ib, svc_id, 0, NULL);
1369         else {
1370                 cma_set_compare_data(id_priv->id.ps, addr, &compare_data);
1371                 ret = ib_cm_listen(id_priv->cm_id.ib, svc_id, 0, &compare_data);
1372         }
1373
1374         if (ret) {
1375                 ib_destroy_cm_id(id_priv->cm_id.ib);
1376                 id_priv->cm_id.ib = NULL;
1377         }
1378
1379         return ret;
1380 }
1381
1382 static int cma_iw_listen(struct rdma_id_private *id_priv, int backlog)
1383 {
1384         int ret;
1385         struct sockaddr_in *sin;
1386
1387         id_priv->cm_id.iw = iw_create_cm_id(id_priv->id.device,
1388                                             iw_conn_req_handler,
1389                                             id_priv);
1390         if (IS_ERR(id_priv->cm_id.iw))
1391                 return PTR_ERR(id_priv->cm_id.iw);
1392
1393         sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1394         id_priv->cm_id.iw->local_addr = *sin;
1395
1396         ret = iw_cm_listen(id_priv->cm_id.iw, backlog);
1397
1398         if (ret) {
1399                 iw_destroy_cm_id(id_priv->cm_id.iw);
1400                 id_priv->cm_id.iw = NULL;
1401         }
1402
1403         return ret;
1404 }
1405
1406 static int cma_listen_handler(struct rdma_cm_id *id,
1407                               struct rdma_cm_event *event)
1408 {
1409         struct rdma_id_private *id_priv = id->context;
1410
1411         id->context = id_priv->id.context;
1412         id->event_handler = id_priv->id.event_handler;
1413         return id_priv->id.event_handler(id, event);
1414 }
1415
1416 static void cma_listen_on_dev(struct rdma_id_private *id_priv,
1417                               struct cma_device *cma_dev)
1418 {
1419         struct rdma_id_private *dev_id_priv;
1420         struct rdma_cm_id *id;
1421         int ret;
1422
1423         id = rdma_create_id(cma_listen_handler, id_priv, id_priv->id.ps);
1424         if (IS_ERR(id))
1425                 return;
1426
1427         dev_id_priv = container_of(id, struct rdma_id_private, id);
1428
1429         dev_id_priv->state = CMA_ADDR_BOUND;
1430         memcpy(&id->route.addr.src_addr, &id_priv->id.route.addr.src_addr,
1431                ip_addr_size(&id_priv->id.route.addr.src_addr));
1432
1433         cma_attach_to_dev(dev_id_priv, cma_dev);
1434         list_add_tail(&dev_id_priv->listen_list, &id_priv->listen_list);
1435         atomic_inc(&id_priv->refcount);
1436         dev_id_priv->internal_id = 1;
1437
1438         ret = rdma_listen(id, id_priv->backlog);
1439         if (ret)
1440                 printk(KERN_WARNING "RDMA CMA: cma_listen_on_dev, error %d, "
1441                        "listening on device %s", ret, cma_dev->device->name);
1442 }
1443
1444 static void cma_listen_on_all(struct rdma_id_private *id_priv)
1445 {
1446         struct cma_device *cma_dev;
1447
1448         mutex_lock(&lock);
1449         list_add_tail(&id_priv->list, &listen_any_list);
1450         list_for_each_entry(cma_dev, &dev_list, list)
1451                 cma_listen_on_dev(id_priv, cma_dev);
1452         mutex_unlock(&lock);
1453 }
1454
1455 static int cma_bind_any(struct rdma_cm_id *id, sa_family_t af)
1456 {
1457         struct sockaddr_in addr_in;
1458
1459         memset(&addr_in, 0, sizeof addr_in);
1460         addr_in.sin_family = af;
1461         return rdma_bind_addr(id, (struct sockaddr *) &addr_in);
1462 }
1463
1464 int rdma_listen(struct rdma_cm_id *id, int backlog)
1465 {
1466         struct rdma_id_private *id_priv;
1467         int ret;
1468
1469         id_priv = container_of(id, struct rdma_id_private, id);
1470         if (id_priv->state == CMA_IDLE) {
1471                 ret = cma_bind_any(id, AF_INET);
1472                 if (ret)
1473                         return ret;
1474         }
1475
1476         if (!cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_LISTEN))
1477                 return -EINVAL;
1478
1479         id_priv->backlog = backlog;
1480         if (id->device) {
1481                 switch (rdma_node_get_transport(id->device->node_type)) {
1482                 case RDMA_TRANSPORT_IB:
1483                         ret = cma_ib_listen(id_priv);
1484                         if (ret)
1485                                 goto err;
1486                         break;
1487                 case RDMA_TRANSPORT_IWARP:
1488                         ret = cma_iw_listen(id_priv, backlog);
1489                         if (ret)
1490                                 goto err;
1491                         break;
1492                 default:
1493                         ret = -ENOSYS;
1494                         goto err;
1495                 }
1496         } else
1497                 cma_listen_on_all(id_priv);
1498
1499         return 0;
1500 err:
1501         id_priv->backlog = 0;
1502         cma_comp_exch(id_priv, CMA_LISTEN, CMA_ADDR_BOUND);
1503         return ret;
1504 }
1505 EXPORT_SYMBOL(rdma_listen);
1506
1507 void rdma_set_service_type(struct rdma_cm_id *id, int tos)
1508 {
1509         struct rdma_id_private *id_priv;
1510
1511         id_priv = container_of(id, struct rdma_id_private, id);
1512         id_priv->tos = (u8) tos;
1513 }
1514 EXPORT_SYMBOL(rdma_set_service_type);
1515
1516 static void cma_query_handler(int status, struct ib_sa_path_rec *path_rec,
1517                               void *context)
1518 {
1519         struct cma_work *work = context;
1520         struct rdma_route *route;
1521
1522         route = &work->id->id.route;
1523
1524         if (!status) {
1525                 route->num_paths = 1;
1526                 *route->path_rec = *path_rec;
1527         } else {
1528                 work->old_state = CMA_ROUTE_QUERY;
1529                 work->new_state = CMA_ADDR_RESOLVED;
1530                 work->event.event = RDMA_CM_EVENT_ROUTE_ERROR;
1531                 work->event.status = status;
1532         }
1533
1534         queue_work(cma_wq, &work->work);
1535 }
1536
1537 static int cma_query_ib_route(struct rdma_id_private *id_priv, int timeout_ms,
1538                               struct cma_work *work)
1539 {
1540         struct rdma_addr *addr = &id_priv->id.route.addr;
1541         struct ib_sa_path_rec path_rec;
1542         ib_sa_comp_mask comp_mask;
1543         struct sockaddr_in6 *sin6;
1544
1545         memset(&path_rec, 0, sizeof path_rec);
1546         ib_addr_get_sgid(&addr->dev_addr, &path_rec.sgid);
1547         ib_addr_get_dgid(&addr->dev_addr, &path_rec.dgid);
1548         path_rec.pkey = cpu_to_be16(ib_addr_get_pkey(&addr->dev_addr));
1549         path_rec.numb_path = 1;
1550         path_rec.reversible = 1;
1551         path_rec.service_id = cma_get_service_id(id_priv->id.ps, &addr->dst_addr);
1552
1553         comp_mask = IB_SA_PATH_REC_DGID | IB_SA_PATH_REC_SGID |
1554                     IB_SA_PATH_REC_PKEY | IB_SA_PATH_REC_NUMB_PATH |
1555                     IB_SA_PATH_REC_REVERSIBLE | IB_SA_PATH_REC_SERVICE_ID;
1556
1557         if (addr->src_addr.sa_family == AF_INET) {
1558                 path_rec.qos_class = cpu_to_be16((u16) id_priv->tos);
1559                 comp_mask |= IB_SA_PATH_REC_QOS_CLASS;
1560         } else {
1561                 sin6 = (struct sockaddr_in6 *) &addr->src_addr;
1562                 path_rec.traffic_class = (u8) (be32_to_cpu(sin6->sin6_flowinfo) >> 20);
1563                 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
1564         }
1565
1566         id_priv->query_id = ib_sa_path_rec_get(&sa_client, id_priv->id.device,
1567                                                id_priv->id.port_num, &path_rec,
1568                                                comp_mask, timeout_ms,
1569                                                GFP_KERNEL, cma_query_handler,
1570                                                work, &id_priv->query);
1571
1572         return (id_priv->query_id < 0) ? id_priv->query_id : 0;
1573 }
1574
1575 static void cma_work_handler(struct work_struct *_work)
1576 {
1577         struct cma_work *work = container_of(_work, struct cma_work, work);
1578         struct rdma_id_private *id_priv = work->id;
1579         int destroy = 0;
1580
1581         atomic_inc(&id_priv->dev_remove);
1582         if (!cma_comp_exch(id_priv, work->old_state, work->new_state))
1583                 goto out;
1584
1585         if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
1586                 cma_exch(id_priv, CMA_DESTROYING);
1587                 destroy = 1;
1588         }
1589 out:
1590         cma_enable_remove(id_priv);
1591         cma_deref_id(id_priv);
1592         if (destroy)
1593                 rdma_destroy_id(&id_priv->id);
1594         kfree(work);
1595 }
1596
1597 static int cma_resolve_ib_route(struct rdma_id_private *id_priv, int timeout_ms)
1598 {
1599         struct rdma_route *route = &id_priv->id.route;
1600         struct cma_work *work;
1601         int ret;
1602
1603         work = kzalloc(sizeof *work, GFP_KERNEL);
1604         if (!work)
1605                 return -ENOMEM;
1606
1607         work->id = id_priv;
1608         INIT_WORK(&work->work, cma_work_handler);
1609         work->old_state = CMA_ROUTE_QUERY;
1610         work->new_state = CMA_ROUTE_RESOLVED;
1611         work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
1612
1613         route->path_rec = kmalloc(sizeof *route->path_rec, GFP_KERNEL);
1614         if (!route->path_rec) {
1615                 ret = -ENOMEM;
1616                 goto err1;
1617         }
1618
1619         ret = cma_query_ib_route(id_priv, timeout_ms, work);
1620         if (ret)
1621                 goto err2;
1622
1623         return 0;
1624 err2:
1625         kfree(route->path_rec);
1626         route->path_rec = NULL;
1627 err1:
1628         kfree(work);
1629         return ret;
1630 }
1631
1632 int rdma_set_ib_paths(struct rdma_cm_id *id,
1633                       struct ib_sa_path_rec *path_rec, int num_paths)
1634 {
1635         struct rdma_id_private *id_priv;
1636         int ret;
1637
1638         id_priv = container_of(id, struct rdma_id_private, id);
1639         if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ROUTE_RESOLVED))
1640                 return -EINVAL;
1641
1642         id->route.path_rec = kmalloc(sizeof *path_rec * num_paths, GFP_KERNEL);
1643         if (!id->route.path_rec) {
1644                 ret = -ENOMEM;
1645                 goto err;
1646         }
1647
1648         memcpy(id->route.path_rec, path_rec, sizeof *path_rec * num_paths);
1649         return 0;
1650 err:
1651         cma_comp_exch(id_priv, CMA_ROUTE_RESOLVED, CMA_ADDR_RESOLVED);
1652         return ret;
1653 }
1654 EXPORT_SYMBOL(rdma_set_ib_paths);
1655
1656 static int cma_resolve_iw_route(struct rdma_id_private *id_priv, int timeout_ms)
1657 {
1658         struct cma_work *work;
1659
1660         work = kzalloc(sizeof *work, GFP_KERNEL);
1661         if (!work)
1662                 return -ENOMEM;
1663
1664         work->id = id_priv;
1665         INIT_WORK(&work->work, cma_work_handler);
1666         work->old_state = CMA_ROUTE_QUERY;
1667         work->new_state = CMA_ROUTE_RESOLVED;
1668         work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
1669         queue_work(cma_wq, &work->work);
1670         return 0;
1671 }
1672
1673 int rdma_resolve_route(struct rdma_cm_id *id, int timeout_ms)
1674 {
1675         struct rdma_id_private *id_priv;
1676         int ret;
1677
1678         id_priv = container_of(id, struct rdma_id_private, id);
1679         if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ROUTE_QUERY))
1680                 return -EINVAL;
1681
1682         atomic_inc(&id_priv->refcount);
1683         switch (rdma_node_get_transport(id->device->node_type)) {
1684         case RDMA_TRANSPORT_IB:
1685                 ret = cma_resolve_ib_route(id_priv, timeout_ms);
1686                 break;
1687         case RDMA_TRANSPORT_IWARP:
1688                 ret = cma_resolve_iw_route(id_priv, timeout_ms);
1689                 break;
1690         default:
1691                 ret = -ENOSYS;
1692                 break;
1693         }
1694         if (ret)
1695                 goto err;
1696
1697         return 0;
1698 err:
1699         cma_comp_exch(id_priv, CMA_ROUTE_QUERY, CMA_ADDR_RESOLVED);
1700         cma_deref_id(id_priv);
1701         return ret;
1702 }
1703 EXPORT_SYMBOL(rdma_resolve_route);
1704
1705 static int cma_bind_loopback(struct rdma_id_private *id_priv)
1706 {
1707         struct cma_device *cma_dev;
1708         struct ib_port_attr port_attr;
1709         union ib_gid gid;
1710         u16 pkey;
1711         int ret;
1712         u8 p;
1713
1714         mutex_lock(&lock);
1715         if (list_empty(&dev_list)) {
1716                 ret = -ENODEV;
1717                 goto out;
1718         }
1719         list_for_each_entry(cma_dev, &dev_list, list)
1720                 for (p = 1; p <= cma_dev->device->phys_port_cnt; ++p)
1721                         if (!ib_query_port(cma_dev->device, p, &port_attr) &&
1722                             port_attr.state == IB_PORT_ACTIVE)
1723                                 goto port_found;
1724
1725         p = 1;
1726         cma_dev = list_entry(dev_list.next, struct cma_device, list);
1727
1728 port_found:
1729         ret = ib_get_cached_gid(cma_dev->device, p, 0, &gid);
1730         if (ret)
1731                 goto out;
1732
1733         ret = ib_get_cached_pkey(cma_dev->device, p, 0, &pkey);
1734         if (ret)
1735                 goto out;
1736
1737         ib_addr_set_sgid(&id_priv->id.route.addr.dev_addr, &gid);
1738         ib_addr_set_pkey(&id_priv->id.route.addr.dev_addr, pkey);
1739         id_priv->id.port_num = p;
1740         cma_attach_to_dev(id_priv, cma_dev);
1741 out:
1742         mutex_unlock(&lock);
1743         return ret;
1744 }
1745
1746 static void addr_handler(int status, struct sockaddr *src_addr,
1747                          struct rdma_dev_addr *dev_addr, void *context)
1748 {
1749         struct rdma_id_private *id_priv = context;
1750         struct rdma_cm_event event;
1751
1752         memset(&event, 0, sizeof event);
1753         atomic_inc(&id_priv->dev_remove);
1754
1755         /*
1756          * Grab mutex to block rdma_destroy_id() from removing the device while
1757          * we're trying to acquire it.
1758          */
1759         mutex_lock(&lock);
1760         if (!cma_comp_exch(id_priv, CMA_ADDR_QUERY, CMA_ADDR_RESOLVED)) {
1761                 mutex_unlock(&lock);
1762                 goto out;
1763         }
1764
1765         if (!status && !id_priv->cma_dev)
1766                 status = cma_acquire_dev(id_priv);
1767         mutex_unlock(&lock);
1768
1769         if (status) {
1770                 if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ADDR_BOUND))
1771                         goto out;
1772                 event.event = RDMA_CM_EVENT_ADDR_ERROR;
1773                 event.status = status;
1774         } else {
1775                 memcpy(&id_priv->id.route.addr.src_addr, src_addr,
1776                        ip_addr_size(src_addr));
1777                 event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
1778         }
1779
1780         if (id_priv->id.event_handler(&id_priv->id, &event)) {
1781                 cma_exch(id_priv, CMA_DESTROYING);
1782                 cma_enable_remove(id_priv);
1783                 cma_deref_id(id_priv);
1784                 rdma_destroy_id(&id_priv->id);
1785                 return;
1786         }
1787 out:
1788         cma_enable_remove(id_priv);
1789         cma_deref_id(id_priv);
1790 }
1791
1792 static int cma_resolve_loopback(struct rdma_id_private *id_priv)
1793 {
1794         struct cma_work *work;
1795         struct sockaddr_in *src_in, *dst_in;
1796         union ib_gid gid;
1797         int ret;
1798
1799         work = kzalloc(sizeof *work, GFP_KERNEL);
1800         if (!work)
1801                 return -ENOMEM;
1802
1803         if (!id_priv->cma_dev) {
1804                 ret = cma_bind_loopback(id_priv);
1805                 if (ret)
1806                         goto err;
1807         }
1808
1809         ib_addr_get_sgid(&id_priv->id.route.addr.dev_addr, &gid);
1810         ib_addr_set_dgid(&id_priv->id.route.addr.dev_addr, &gid);
1811
1812         if (cma_zero_addr(&id_priv->id.route.addr.src_addr)) {
1813                 src_in = (struct sockaddr_in *)&id_priv->id.route.addr.src_addr;
1814                 dst_in = (struct sockaddr_in *)&id_priv->id.route.addr.dst_addr;
1815                 src_in->sin_family = dst_in->sin_family;
1816                 src_in->sin_addr.s_addr = dst_in->sin_addr.s_addr;
1817         }
1818
1819         work->id = id_priv;
1820         INIT_WORK(&work->work, cma_work_handler);
1821         work->old_state = CMA_ADDR_QUERY;
1822         work->new_state = CMA_ADDR_RESOLVED;
1823         work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
1824         queue_work(cma_wq, &work->work);
1825         return 0;
1826 err:
1827         kfree(work);
1828         return ret;
1829 }
1830
1831 static int cma_bind_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
1832                          struct sockaddr *dst_addr)
1833 {
1834         if (src_addr && src_addr->sa_family)
1835                 return rdma_bind_addr(id, src_addr);
1836         else
1837                 return cma_bind_any(id, dst_addr->sa_family);
1838 }
1839
1840 int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
1841                       struct sockaddr *dst_addr, int timeout_ms)
1842 {
1843         struct rdma_id_private *id_priv;
1844         int ret;
1845
1846         id_priv = container_of(id, struct rdma_id_private, id);
1847         if (id_priv->state == CMA_IDLE) {
1848                 ret = cma_bind_addr(id, src_addr, dst_addr);
1849                 if (ret)
1850                         return ret;
1851         }
1852
1853         if (!cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_ADDR_QUERY))
1854                 return -EINVAL;
1855
1856         atomic_inc(&id_priv->refcount);
1857         memcpy(&id->route.addr.dst_addr, dst_addr, ip_addr_size(dst_addr));
1858         if (cma_any_addr(dst_addr))
1859                 ret = cma_resolve_loopback(id_priv);
1860         else
1861                 ret = rdma_resolve_ip(&addr_client, &id->route.addr.src_addr,
1862                                       dst_addr, &id->route.addr.dev_addr,
1863                                       timeout_ms, addr_handler, id_priv);
1864         if (ret)
1865                 goto err;
1866
1867         return 0;
1868 err:
1869         cma_comp_exch(id_priv, CMA_ADDR_QUERY, CMA_ADDR_BOUND);
1870         cma_deref_id(id_priv);
1871         return ret;
1872 }
1873 EXPORT_SYMBOL(rdma_resolve_addr);
1874
1875 static void cma_bind_port(struct rdma_bind_list *bind_list,
1876                           struct rdma_id_private *id_priv)
1877 {
1878         struct sockaddr_in *sin;
1879
1880         sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1881         sin->sin_port = htons(bind_list->port);
1882         id_priv->bind_list = bind_list;
1883         hlist_add_head(&id_priv->node, &bind_list->owners);
1884 }
1885
1886 static int cma_alloc_port(struct idr *ps, struct rdma_id_private *id_priv,
1887                           unsigned short snum)
1888 {
1889         struct rdma_bind_list *bind_list;
1890         int port, ret;
1891
1892         bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL);
1893         if (!bind_list)
1894                 return -ENOMEM;
1895
1896         do {
1897                 ret = idr_get_new_above(ps, bind_list, snum, &port);
1898         } while ((ret == -EAGAIN) && idr_pre_get(ps, GFP_KERNEL));
1899
1900         if (ret)
1901                 goto err1;
1902
1903         if (port != snum) {
1904                 ret = -EADDRNOTAVAIL;
1905                 goto err2;
1906         }
1907
1908         bind_list->ps = ps;
1909         bind_list->port = (unsigned short) port;
1910         cma_bind_port(bind_list, id_priv);
1911         return 0;
1912 err2:
1913         idr_remove(ps, port);
1914 err1:
1915         kfree(bind_list);
1916         return ret;
1917 }
1918
1919 static int cma_alloc_any_port(struct idr *ps, struct rdma_id_private *id_priv)
1920 {
1921         struct rdma_bind_list *bind_list;
1922         int port, ret, low, high;
1923
1924         bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL);
1925         if (!bind_list)
1926                 return -ENOMEM;
1927
1928 retry:
1929         /* FIXME: add proper port randomization per like inet_csk_get_port */
1930         do {
1931                 ret = idr_get_new_above(ps, bind_list, next_port, &port);
1932         } while ((ret == -EAGAIN) && idr_pre_get(ps, GFP_KERNEL));
1933
1934         if (ret)
1935                 goto err1;
1936
1937         inet_get_local_port_range(&low, &high);
1938         if (port > high) {
1939                 if (next_port != low) {
1940                         idr_remove(ps, port);
1941                         next_port = low;
1942                         goto retry;
1943                 }
1944                 ret = -EADDRNOTAVAIL;
1945                 goto err2;
1946         }
1947
1948         if (port == high)
1949                 next_port = low;
1950         else
1951                 next_port = port + 1;
1952
1953         bind_list->ps = ps;
1954         bind_list->port = (unsigned short) port;
1955         cma_bind_port(bind_list, id_priv);
1956         return 0;
1957 err2:
1958         idr_remove(ps, port);
1959 err1:
1960         kfree(bind_list);
1961         return ret;
1962 }
1963
1964 static int cma_use_port(struct idr *ps, struct rdma_id_private *id_priv)
1965 {
1966         struct rdma_id_private *cur_id;
1967         struct sockaddr_in *sin, *cur_sin;
1968         struct rdma_bind_list *bind_list;
1969         struct hlist_node *node;
1970         unsigned short snum;
1971
1972         sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1973         snum = ntohs(sin->sin_port);
1974         if (snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
1975                 return -EACCES;
1976
1977         bind_list = idr_find(ps, snum);
1978         if (!bind_list)
1979                 return cma_alloc_port(ps, id_priv, snum);
1980
1981         /*
1982          * We don't support binding to any address if anyone is bound to
1983          * a specific address on the same port.
1984          */
1985         if (cma_any_addr(&id_priv->id.route.addr.src_addr))
1986                 return -EADDRNOTAVAIL;
1987
1988         hlist_for_each_entry(cur_id, node, &bind_list->owners, node) {
1989                 if (cma_any_addr(&cur_id->id.route.addr.src_addr))
1990                         return -EADDRNOTAVAIL;
1991
1992                 cur_sin = (struct sockaddr_in *) &cur_id->id.route.addr.src_addr;
1993                 if (sin->sin_addr.s_addr == cur_sin->sin_addr.s_addr)
1994                         return -EADDRINUSE;
1995         }
1996
1997         cma_bind_port(bind_list, id_priv);
1998         return 0;
1999 }
2000
2001 static int cma_get_port(struct rdma_id_private *id_priv)
2002 {
2003         struct idr *ps;
2004         int ret;
2005
2006         switch (id_priv->id.ps) {
2007         case RDMA_PS_SDP:
2008                 ps = &sdp_ps;
2009                 break;
2010         case RDMA_PS_TCP:
2011                 ps = &tcp_ps;
2012                 break;
2013         case RDMA_PS_UDP:
2014                 ps = &udp_ps;
2015                 break;
2016         case RDMA_PS_IPOIB:
2017                 ps = &ipoib_ps;
2018                 break;
2019         default:
2020                 return -EPROTONOSUPPORT;
2021         }
2022
2023         mutex_lock(&lock);
2024         if (cma_any_port(&id_priv->id.route.addr.src_addr))
2025                 ret = cma_alloc_any_port(ps, id_priv);
2026         else
2027                 ret = cma_use_port(ps, id_priv);
2028         mutex_unlock(&lock);
2029
2030         return ret;
2031 }
2032
2033 int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr)
2034 {
2035         struct rdma_id_private *id_priv;
2036         int ret;
2037
2038         if (addr->sa_family != AF_INET)
2039                 return -EAFNOSUPPORT;
2040
2041         id_priv = container_of(id, struct rdma_id_private, id);
2042         if (!cma_comp_exch(id_priv, CMA_IDLE, CMA_ADDR_BOUND))
2043                 return -EINVAL;
2044
2045         if (!cma_any_addr(addr)) {
2046                 ret = rdma_translate_ip(addr, &id->route.addr.dev_addr);
2047                 if (ret)
2048                         goto err1;
2049
2050                 mutex_lock(&lock);
2051                 ret = cma_acquire_dev(id_priv);
2052                 mutex_unlock(&lock);
2053                 if (ret)
2054                         goto err1;
2055         }
2056
2057         memcpy(&id->route.addr.src_addr, addr, ip_addr_size(addr));
2058         ret = cma_get_port(id_priv);
2059         if (ret)
2060                 goto err2;
2061
2062         return 0;
2063 err2:
2064         if (!cma_any_addr(addr)) {
2065                 mutex_lock(&lock);
2066                 cma_detach_from_dev(id_priv);
2067                 mutex_unlock(&lock);
2068         }
2069 err1:
2070         cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_IDLE);
2071         return ret;
2072 }
2073 EXPORT_SYMBOL(rdma_bind_addr);
2074
2075 static int cma_format_hdr(void *hdr, enum rdma_port_space ps,
2076                           struct rdma_route *route)
2077 {
2078         struct sockaddr_in *src4, *dst4;
2079         struct cma_hdr *cma_hdr;
2080         struct sdp_hh *sdp_hdr;
2081
2082         src4 = (struct sockaddr_in *) &route->addr.src_addr;
2083         dst4 = (struct sockaddr_in *) &route->addr.dst_addr;
2084
2085         switch (ps) {
2086         case RDMA_PS_SDP:
2087                 sdp_hdr = hdr;
2088                 if (sdp_get_majv(sdp_hdr->sdp_version) != SDP_MAJ_VERSION)
2089                         return -EINVAL;
2090                 sdp_set_ip_ver(sdp_hdr, 4);
2091                 sdp_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
2092                 sdp_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
2093                 sdp_hdr->port = src4->sin_port;
2094                 break;
2095         default:
2096                 cma_hdr = hdr;
2097                 cma_hdr->cma_version = CMA_VERSION;
2098                 cma_set_ip_ver(cma_hdr, 4);
2099                 cma_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
2100                 cma_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
2101                 cma_hdr->port = src4->sin_port;
2102                 break;
2103         }
2104         return 0;
2105 }
2106
2107 static int cma_sidr_rep_handler(struct ib_cm_id *cm_id,
2108                                 struct ib_cm_event *ib_event)
2109 {
2110         struct rdma_id_private *id_priv = cm_id->context;
2111         struct rdma_cm_event event;
2112         struct ib_cm_sidr_rep_event_param *rep = &ib_event->param.sidr_rep_rcvd;
2113         int ret = 0;
2114
2115         if (cma_disable_remove(id_priv, CMA_CONNECT))
2116                 return 0;
2117
2118         memset(&event, 0, sizeof event);
2119         switch (ib_event->event) {
2120         case IB_CM_SIDR_REQ_ERROR:
2121                 event.event = RDMA_CM_EVENT_UNREACHABLE;
2122                 event.status = -ETIMEDOUT;
2123                 break;
2124         case IB_CM_SIDR_REP_RECEIVED:
2125                 event.param.ud.private_data = ib_event->private_data;
2126                 event.param.ud.private_data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
2127                 if (rep->status != IB_SIDR_SUCCESS) {
2128                         event.event = RDMA_CM_EVENT_UNREACHABLE;
2129                         event.status = ib_event->param.sidr_rep_rcvd.status;
2130                         break;
2131                 }
2132                 if (id_priv->qkey != rep->qkey) {
2133                         event.event = RDMA_CM_EVENT_UNREACHABLE;
2134                         event.status = -EINVAL;
2135                         break;
2136                 }
2137                 ib_init_ah_from_path(id_priv->id.device, id_priv->id.port_num,
2138                                      id_priv->id.route.path_rec,
2139                                      &event.param.ud.ah_attr);
2140                 event.param.ud.qp_num = rep->qpn;
2141                 event.param.ud.qkey = rep->qkey;
2142                 event.event = RDMA_CM_EVENT_ESTABLISHED;
2143                 event.status = 0;
2144                 break;
2145         default:
2146                 printk(KERN_ERR "RDMA CMA: unexpected IB CM event: %d",
2147                        ib_event->event);
2148                 goto out;
2149         }
2150
2151         ret = id_priv->id.event_handler(&id_priv->id, &event);
2152         if (ret) {
2153                 /* Destroy the CM ID by returning a non-zero value. */
2154                 id_priv->cm_id.ib = NULL;
2155                 cma_exch(id_priv, CMA_DESTROYING);
2156                 cma_enable_remove(id_priv);
2157                 rdma_destroy_id(&id_priv->id);
2158                 return ret;
2159         }
2160 out:
2161         cma_enable_remove(id_priv);
2162         return ret;
2163 }
2164
2165 static int cma_resolve_ib_udp(struct rdma_id_private *id_priv,
2166                               struct rdma_conn_param *conn_param)
2167 {
2168         struct ib_cm_sidr_req_param req;
2169         struct rdma_route *route;
2170         int ret;
2171
2172         req.private_data_len = sizeof(struct cma_hdr) +
2173                                conn_param->private_data_len;
2174         req.private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
2175         if (!req.private_data)
2176                 return -ENOMEM;
2177
2178         if (conn_param->private_data && conn_param->private_data_len)
2179                 memcpy((void *) req.private_data + sizeof(struct cma_hdr),
2180                        conn_param->private_data, conn_param->private_data_len);
2181
2182         route = &id_priv->id.route;
2183         ret = cma_format_hdr((void *) req.private_data, id_priv->id.ps, route);
2184         if (ret)
2185                 goto out;
2186
2187         id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device,
2188                                             cma_sidr_rep_handler, id_priv);
2189         if (IS_ERR(id_priv->cm_id.ib)) {
2190                 ret = PTR_ERR(id_priv->cm_id.ib);
2191                 goto out;
2192         }
2193
2194         req.path = route->path_rec;
2195         req.service_id = cma_get_service_id(id_priv->id.ps,
2196                                             &route->addr.dst_addr);
2197         req.timeout_ms = 1 << (CMA_CM_RESPONSE_TIMEOUT - 8);
2198         req.max_cm_retries = CMA_MAX_CM_RETRIES;
2199
2200         ret = ib_send_cm_sidr_req(id_priv->cm_id.ib, &req);
2201         if (ret) {
2202                 ib_destroy_cm_id(id_priv->cm_id.ib);
2203                 id_priv->cm_id.ib = NULL;
2204         }
2205 out:
2206         kfree(req.private_data);
2207         return ret;
2208 }
2209
2210 static int cma_connect_ib(struct rdma_id_private *id_priv,
2211                           struct rdma_conn_param *conn_param)
2212 {
2213         struct ib_cm_req_param req;
2214         struct rdma_route *route;
2215         void *private_data;
2216         int offset, ret;
2217
2218         memset(&req, 0, sizeof req);
2219         offset = cma_user_data_offset(id_priv->id.ps);
2220         req.private_data_len = offset + conn_param->private_data_len;
2221         private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
2222         if (!private_data)
2223                 return -ENOMEM;
2224
2225         if (conn_param->private_data && conn_param->private_data_len)
2226                 memcpy(private_data + offset, conn_param->private_data,
2227                        conn_param->private_data_len);
2228
2229         id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device, cma_ib_handler,
2230                                             id_priv);
2231         if (IS_ERR(id_priv->cm_id.ib)) {
2232                 ret = PTR_ERR(id_priv->cm_id.ib);
2233                 goto out;
2234         }
2235
2236         route = &id_priv->id.route;
2237         ret = cma_format_hdr(private_data, id_priv->id.ps, route);
2238         if (ret)
2239                 goto out;
2240         req.private_data = private_data;
2241
2242         req.primary_path = &route->path_rec[0];
2243         if (route->num_paths == 2)
2244                 req.alternate_path = &route->path_rec[1];
2245
2246         req.service_id = cma_get_service_id(id_priv->id.ps,
2247                                             &route->addr.dst_addr);
2248         req.qp_num = id_priv->qp_num;
2249         req.qp_type = IB_QPT_RC;
2250         req.starting_psn = id_priv->seq_num;
2251         req.responder_resources = conn_param->responder_resources;
2252         req.initiator_depth = conn_param->initiator_depth;
2253         req.flow_control = conn_param->flow_control;
2254         req.retry_count = conn_param->retry_count;
2255         req.rnr_retry_count = conn_param->rnr_retry_count;
2256         req.remote_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
2257         req.local_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
2258         req.max_cm_retries = CMA_MAX_CM_RETRIES;
2259         req.srq = id_priv->srq ? 1 : 0;
2260
2261         ret = ib_send_cm_req(id_priv->cm_id.ib, &req);
2262 out:
2263         if (ret && !IS_ERR(id_priv->cm_id.ib)) {
2264                 ib_destroy_cm_id(id_priv->cm_id.ib);
2265                 id_priv->cm_id.ib = NULL;
2266         }
2267
2268         kfree(private_data);
2269         return ret;
2270 }
2271
2272 static int cma_connect_iw(struct rdma_id_private *id_priv,
2273                           struct rdma_conn_param *conn_param)
2274 {
2275         struct iw_cm_id *cm_id;
2276         struct sockaddr_in* sin;
2277         int ret;
2278         struct iw_cm_conn_param iw_param;
2279
2280         cm_id = iw_create_cm_id(id_priv->id.device, cma_iw_handler, id_priv);
2281         if (IS_ERR(cm_id)) {
2282                 ret = PTR_ERR(cm_id);
2283                 goto out;
2284         }
2285
2286         id_priv->cm_id.iw = cm_id;
2287
2288         sin = (struct sockaddr_in*) &id_priv->id.route.addr.src_addr;
2289         cm_id->local_addr = *sin;
2290
2291         sin = (struct sockaddr_in*) &id_priv->id.route.addr.dst_addr;
2292         cm_id->remote_addr = *sin;
2293
2294         ret = cma_modify_qp_rtr(id_priv, conn_param);
2295         if (ret)
2296                 goto out;
2297
2298         iw_param.ord = conn_param->initiator_depth;
2299         iw_param.ird = conn_param->responder_resources;
2300         iw_param.private_data = conn_param->private_data;
2301         iw_param.private_data_len = conn_param->private_data_len;
2302         if (id_priv->id.qp)
2303                 iw_param.qpn = id_priv->qp_num;
2304         else
2305                 iw_param.qpn = conn_param->qp_num;
2306         ret = iw_cm_connect(cm_id, &iw_param);
2307 out:
2308         if (ret && !IS_ERR(cm_id)) {
2309                 iw_destroy_cm_id(cm_id);
2310                 id_priv->cm_id.iw = NULL;
2311         }
2312         return ret;
2313 }
2314
2315 int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
2316 {
2317         struct rdma_id_private *id_priv;
2318         int ret;
2319
2320         id_priv = container_of(id, struct rdma_id_private, id);
2321         if (!cma_comp_exch(id_priv, CMA_ROUTE_RESOLVED, CMA_CONNECT))
2322                 return -EINVAL;
2323
2324         if (!id->qp) {
2325                 id_priv->qp_num = conn_param->qp_num;
2326                 id_priv->srq = conn_param->srq;
2327         }
2328
2329         switch (rdma_node_get_transport(id->device->node_type)) {
2330         case RDMA_TRANSPORT_IB:
2331                 if (cma_is_ud_ps(id->ps))
2332                         ret = cma_resolve_ib_udp(id_priv, conn_param);
2333                 else
2334                         ret = cma_connect_ib(id_priv, conn_param);
2335                 break;
2336         case RDMA_TRANSPORT_IWARP:
2337                 ret = cma_connect_iw(id_priv, conn_param);
2338                 break;
2339         default:
2340                 ret = -ENOSYS;
2341                 break;
2342         }
2343         if (ret)
2344                 goto err;
2345
2346         return 0;
2347 err:
2348         cma_comp_exch(id_priv, CMA_CONNECT, CMA_ROUTE_RESOLVED);
2349         return ret;
2350 }
2351 EXPORT_SYMBOL(rdma_connect);
2352
2353 static int cma_accept_ib(struct rdma_id_private *id_priv,
2354                          struct rdma_conn_param *conn_param)
2355 {
2356         struct ib_cm_rep_param rep;
2357         int ret;
2358
2359         ret = cma_modify_qp_rtr(id_priv, conn_param);
2360         if (ret)
2361                 goto out;
2362
2363         ret = cma_modify_qp_rts(id_priv, conn_param);
2364         if (ret)
2365                 goto out;
2366
2367         memset(&rep, 0, sizeof rep);
2368         rep.qp_num = id_priv->qp_num;
2369         rep.starting_psn = id_priv->seq_num;
2370         rep.private_data = conn_param->private_data;
2371         rep.private_data_len = conn_param->private_data_len;
2372         rep.responder_resources = conn_param->responder_resources;
2373         rep.initiator_depth = conn_param->initiator_depth;
2374         rep.failover_accepted = 0;
2375         rep.flow_control = conn_param->flow_control;
2376         rep.rnr_retry_count = conn_param->rnr_retry_count;
2377         rep.srq = id_priv->srq ? 1 : 0;
2378
2379         ret = ib_send_cm_rep(id_priv->cm_id.ib, &rep);
2380 out:
2381         return ret;
2382 }
2383
2384 static int cma_accept_iw(struct rdma_id_private *id_priv,
2385                   struct rdma_conn_param *conn_param)
2386 {
2387         struct iw_cm_conn_param iw_param;
2388         int ret;
2389
2390         ret = cma_modify_qp_rtr(id_priv, conn_param);
2391         if (ret)
2392                 return ret;
2393
2394         iw_param.ord = conn_param->initiator_depth;
2395         iw_param.ird = conn_param->responder_resources;
2396         iw_param.private_data = conn_param->private_data;
2397         iw_param.private_data_len = conn_param->private_data_len;
2398         if (id_priv->id.qp) {
2399                 iw_param.qpn = id_priv->qp_num;
2400         } else
2401                 iw_param.qpn = conn_param->qp_num;
2402
2403         return iw_cm_accept(id_priv->cm_id.iw, &iw_param);
2404 }
2405
2406 static int cma_send_sidr_rep(struct rdma_id_private *id_priv,
2407                              enum ib_cm_sidr_status status,
2408                              const void *private_data, int private_data_len)
2409 {
2410         struct ib_cm_sidr_rep_param rep;
2411
2412         memset(&rep, 0, sizeof rep);
2413         rep.status = status;
2414         if (status == IB_SIDR_SUCCESS) {
2415                 rep.qp_num = id_priv->qp_num;
2416                 rep.qkey = id_priv->qkey;
2417         }
2418         rep.private_data = private_data;
2419         rep.private_data_len = private_data_len;
2420
2421         return ib_send_cm_sidr_rep(id_priv->cm_id.ib, &rep);
2422 }
2423
2424 int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
2425 {
2426         struct rdma_id_private *id_priv;
2427         int ret;
2428
2429         id_priv = container_of(id, struct rdma_id_private, id);
2430         if (!cma_comp(id_priv, CMA_CONNECT))
2431                 return -EINVAL;
2432
2433         if (!id->qp && conn_param) {
2434                 id_priv->qp_num = conn_param->qp_num;
2435                 id_priv->srq = conn_param->srq;
2436         }
2437
2438         switch (rdma_node_get_transport(id->device->node_type)) {
2439         case RDMA_TRANSPORT_IB:
2440                 if (cma_is_ud_ps(id->ps))
2441                         ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
2442                                                 conn_param->private_data,
2443                                                 conn_param->private_data_len);
2444                 else if (conn_param)
2445                         ret = cma_accept_ib(id_priv, conn_param);
2446                 else
2447                         ret = cma_rep_recv(id_priv);
2448                 break;
2449         case RDMA_TRANSPORT_IWARP:
2450                 ret = cma_accept_iw(id_priv, conn_param);
2451                 break;
2452         default:
2453                 ret = -ENOSYS;
2454                 break;
2455         }
2456
2457         if (ret)
2458                 goto reject;
2459
2460         return 0;
2461 reject:
2462         cma_modify_qp_err(id_priv);
2463         rdma_reject(id, NULL, 0);
2464         return ret;
2465 }
2466 EXPORT_SYMBOL(rdma_accept);
2467
2468 int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event)
2469 {
2470         struct rdma_id_private *id_priv;
2471         int ret;
2472
2473         id_priv = container_of(id, struct rdma_id_private, id);
2474         if (!cma_has_cm_dev(id_priv))
2475                 return -EINVAL;
2476
2477         switch (id->device->node_type) {
2478         case RDMA_NODE_IB_CA:
2479                 ret = ib_cm_notify(id_priv->cm_id.ib, event);
2480                 break;
2481         default:
2482                 ret = 0;
2483                 break;
2484         }
2485         return ret;
2486 }
2487 EXPORT_SYMBOL(rdma_notify);
2488
2489 int rdma_reject(struct rdma_cm_id *id, const void *private_data,
2490                 u8 private_data_len)
2491 {
2492         struct rdma_id_private *id_priv;
2493         int ret;
2494
2495         id_priv = container_of(id, struct rdma_id_private, id);
2496         if (!cma_has_cm_dev(id_priv))
2497                 return -EINVAL;
2498
2499         switch (rdma_node_get_transport(id->device->node_type)) {
2500         case RDMA_TRANSPORT_IB:
2501                 if (cma_is_ud_ps(id->ps))
2502                         ret = cma_send_sidr_rep(id_priv, IB_SIDR_REJECT,
2503                                                 private_data, private_data_len);
2504                 else
2505                         ret = ib_send_cm_rej(id_priv->cm_id.ib,
2506                                              IB_CM_REJ_CONSUMER_DEFINED, NULL,
2507                                              0, private_data, private_data_len);
2508                 break;
2509         case RDMA_TRANSPORT_IWARP:
2510                 ret = iw_cm_reject(id_priv->cm_id.iw,
2511                                    private_data, private_data_len);
2512                 break;
2513         default:
2514                 ret = -ENOSYS;
2515                 break;
2516         }
2517         return ret;
2518 }
2519 EXPORT_SYMBOL(rdma_reject);
2520
2521 int rdma_disconnect(struct rdma_cm_id *id)
2522 {
2523         struct rdma_id_private *id_priv;
2524         int ret;
2525
2526         id_priv = container_of(id, struct rdma_id_private, id);
2527         if (!cma_has_cm_dev(id_priv))
2528                 return -EINVAL;
2529
2530         switch (rdma_node_get_transport(id->device->node_type)) {
2531         case RDMA_TRANSPORT_IB:
2532                 ret = cma_modify_qp_err(id_priv);
2533                 if (ret)
2534                         goto out;
2535                 /* Initiate or respond to a disconnect. */
2536                 if (ib_send_cm_dreq(id_priv->cm_id.ib, NULL, 0))
2537                         ib_send_cm_drep(id_priv->cm_id.ib, NULL, 0);
2538                 break;
2539         case RDMA_TRANSPORT_IWARP:
2540                 ret = iw_cm_disconnect(id_priv->cm_id.iw, 0);
2541                 break;
2542         default:
2543                 ret = -EINVAL;
2544                 break;
2545         }
2546 out:
2547         return ret;
2548 }
2549 EXPORT_SYMBOL(rdma_disconnect);
2550
2551 static int cma_ib_mc_handler(int status, struct ib_sa_multicast *multicast)
2552 {
2553         struct rdma_id_private *id_priv;
2554         struct cma_multicast *mc = multicast->context;
2555         struct rdma_cm_event event;
2556         int ret;
2557
2558         id_priv = mc->id_priv;
2559         if (cma_disable_remove(id_priv, CMA_ADDR_BOUND) &&
2560             cma_disable_remove(id_priv, CMA_ADDR_RESOLVED))
2561                 return 0;
2562
2563         mutex_lock(&id_priv->qp_mutex);
2564         if (!status && id_priv->id.qp)
2565                 status = ib_attach_mcast(id_priv->id.qp, &multicast->rec.mgid,
2566                                          multicast->rec.mlid);
2567         mutex_unlock(&id_priv->qp_mutex);
2568
2569         memset(&event, 0, sizeof event);
2570         event.status = status;
2571         event.param.ud.private_data = mc->context;
2572         if (!status) {
2573                 event.event = RDMA_CM_EVENT_MULTICAST_JOIN;
2574                 ib_init_ah_from_mcmember(id_priv->id.device,
2575                                          id_priv->id.port_num, &multicast->rec,
2576                                          &event.param.ud.ah_attr);
2577                 event.param.ud.qp_num = 0xFFFFFF;
2578                 event.param.ud.qkey = be32_to_cpu(multicast->rec.qkey);
2579         } else
2580                 event.event = RDMA_CM_EVENT_MULTICAST_ERROR;
2581
2582         ret = id_priv->id.event_handler(&id_priv->id, &event);
2583         if (ret) {
2584                 cma_exch(id_priv, CMA_DESTROYING);
2585                 cma_enable_remove(id_priv);
2586                 rdma_destroy_id(&id_priv->id);
2587                 return 0;
2588         }
2589
2590         cma_enable_remove(id_priv);
2591         return 0;
2592 }
2593
2594 static void cma_set_mgid(struct rdma_id_private *id_priv,
2595                          struct sockaddr *addr, union ib_gid *mgid)
2596 {
2597         unsigned char mc_map[MAX_ADDR_LEN];
2598         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
2599         struct sockaddr_in *sin = (struct sockaddr_in *) addr;
2600         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) addr;
2601
2602         if (cma_any_addr(addr)) {
2603                 memset(mgid, 0, sizeof *mgid);
2604         } else if ((addr->sa_family == AF_INET6) &&
2605                    ((be32_to_cpu(sin6->sin6_addr.s6_addr32[0]) & 0xFF10A01B) ==
2606                                                                  0xFF10A01B)) {
2607                 /* IPv6 address is an SA assigned MGID. */
2608                 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
2609         } else {
2610                 ip_ib_mc_map(sin->sin_addr.s_addr, dev_addr->broadcast, mc_map);
2611                 if (id_priv->id.ps == RDMA_PS_UDP)
2612                         mc_map[7] = 0x01;       /* Use RDMA CM signature */
2613                 *mgid = *(union ib_gid *) (mc_map + 4);
2614         }
2615 }
2616
2617 static int cma_join_ib_multicast(struct rdma_id_private *id_priv,
2618                                  struct cma_multicast *mc)
2619 {
2620         struct ib_sa_mcmember_rec rec;
2621         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
2622         ib_sa_comp_mask comp_mask;
2623         int ret;
2624
2625         ib_addr_get_mgid(dev_addr, &rec.mgid);
2626         ret = ib_sa_get_mcmember_rec(id_priv->id.device, id_priv->id.port_num,
2627                                      &rec.mgid, &rec);
2628         if (ret)
2629                 return ret;
2630
2631         cma_set_mgid(id_priv, &mc->addr, &rec.mgid);
2632         if (id_priv->id.ps == RDMA_PS_UDP)
2633                 rec.qkey = cpu_to_be32(RDMA_UDP_QKEY);
2634         ib_addr_get_sgid(dev_addr, &rec.port_gid);
2635         rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
2636         rec.join_state = 1;
2637
2638         comp_mask = IB_SA_MCMEMBER_REC_MGID | IB_SA_MCMEMBER_REC_PORT_GID |
2639                     IB_SA_MCMEMBER_REC_PKEY | IB_SA_MCMEMBER_REC_JOIN_STATE |
2640                     IB_SA_MCMEMBER_REC_QKEY | IB_SA_MCMEMBER_REC_SL |
2641                     IB_SA_MCMEMBER_REC_FLOW_LABEL |
2642                     IB_SA_MCMEMBER_REC_TRAFFIC_CLASS;
2643
2644         mc->multicast.ib = ib_sa_join_multicast(&sa_client, id_priv->id.device,
2645                                                 id_priv->id.port_num, &rec,
2646                                                 comp_mask, GFP_KERNEL,
2647                                                 cma_ib_mc_handler, mc);
2648         if (IS_ERR(mc->multicast.ib))
2649                 return PTR_ERR(mc->multicast.ib);
2650
2651         return 0;
2652 }
2653
2654 int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
2655                         void *context)
2656 {
2657         struct rdma_id_private *id_priv;
2658         struct cma_multicast *mc;
2659         int ret;
2660
2661         id_priv = container_of(id, struct rdma_id_private, id);
2662         if (!cma_comp(id_priv, CMA_ADDR_BOUND) &&
2663             !cma_comp(id_priv, CMA_ADDR_RESOLVED))
2664                 return -EINVAL;
2665
2666         mc = kmalloc(sizeof *mc, GFP_KERNEL);
2667         if (!mc)
2668                 return -ENOMEM;
2669
2670         memcpy(&mc->addr, addr, ip_addr_size(addr));
2671         mc->context = context;
2672         mc->id_priv = id_priv;
2673
2674         spin_lock(&id_priv->lock);
2675         list_add(&mc->list, &id_priv->mc_list);
2676         spin_unlock(&id_priv->lock);
2677
2678         switch (rdma_node_get_transport(id->device->node_type)) {
2679         case RDMA_TRANSPORT_IB:
2680                 ret = cma_join_ib_multicast(id_priv, mc);
2681                 break;
2682         default:
2683                 ret = -ENOSYS;
2684                 break;
2685         }
2686
2687         if (ret) {
2688                 spin_lock_irq(&id_priv->lock);
2689                 list_del(&mc->list);
2690                 spin_unlock_irq(&id_priv->lock);
2691                 kfree(mc);
2692         }
2693         return ret;
2694 }
2695 EXPORT_SYMBOL(rdma_join_multicast);
2696
2697 void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr)
2698 {
2699         struct rdma_id_private *id_priv;
2700         struct cma_multicast *mc;
2701
2702         id_priv = container_of(id, struct rdma_id_private, id);
2703         spin_lock_irq(&id_priv->lock);
2704         list_for_each_entry(mc, &id_priv->mc_list, list) {
2705                 if (!memcmp(&mc->addr, addr, ip_addr_size(addr))) {
2706                         list_del(&mc->list);
2707                         spin_unlock_irq(&id_priv->lock);
2708
2709                         if (id->qp)
2710                                 ib_detach_mcast(id->qp,
2711                                                 &mc->multicast.ib->rec.mgid,
2712                                                 mc->multicast.ib->rec.mlid);
2713                         ib_sa_free_multicast(mc->multicast.ib);
2714                         kfree(mc);
2715                         return;
2716                 }
2717         }
2718         spin_unlock_irq(&id_priv->lock);
2719 }
2720 EXPORT_SYMBOL(rdma_leave_multicast);
2721
2722 static void cma_add_one(struct ib_device *device)
2723 {
2724         struct cma_device *cma_dev;
2725         struct rdma_id_private *id_priv;
2726
2727         cma_dev = kmalloc(sizeof *cma_dev, GFP_KERNEL);
2728         if (!cma_dev)
2729                 return;
2730
2731         cma_dev->device = device;
2732
2733         init_completion(&cma_dev->comp);
2734         atomic_set(&cma_dev->refcount, 1);
2735         INIT_LIST_HEAD(&cma_dev->id_list);
2736         ib_set_client_data(device, &cma_client, cma_dev);
2737
2738         mutex_lock(&lock);
2739         list_add_tail(&cma_dev->list, &dev_list);
2740         list_for_each_entry(id_priv, &listen_any_list, list)
2741                 cma_listen_on_dev(id_priv, cma_dev);
2742         mutex_unlock(&lock);
2743 }
2744
2745 static int cma_remove_id_dev(struct rdma_id_private *id_priv)
2746 {
2747         struct rdma_cm_event event;
2748         enum cma_state state;
2749
2750         /* Record that we want to remove the device */
2751         state = cma_exch(id_priv, CMA_DEVICE_REMOVAL);
2752         if (state == CMA_DESTROYING)
2753                 return 0;
2754
2755         cma_cancel_operation(id_priv, state);
2756         wait_event(id_priv->wait_remove, !atomic_read(&id_priv->dev_remove));
2757
2758         /* Check for destruction from another callback. */
2759         if (!cma_comp(id_priv, CMA_DEVICE_REMOVAL))
2760                 return 0;
2761
2762         memset(&event, 0, sizeof event);
2763         event.event = RDMA_CM_EVENT_DEVICE_REMOVAL;
2764         return id_priv->id.event_handler(&id_priv->id, &event);
2765 }
2766
2767 static void cma_process_remove(struct cma_device *cma_dev)
2768 {
2769         struct rdma_id_private *id_priv;
2770         int ret;
2771
2772         mutex_lock(&lock);
2773         while (!list_empty(&cma_dev->id_list)) {
2774                 id_priv = list_entry(cma_dev->id_list.next,
2775                                      struct rdma_id_private, list);
2776
2777                 list_del(&id_priv->listen_list);
2778                 list_del_init(&id_priv->list);
2779                 atomic_inc(&id_priv->refcount);
2780                 mutex_unlock(&lock);
2781
2782                 ret = id_priv->internal_id ? 1 : cma_remove_id_dev(id_priv);
2783                 cma_deref_id(id_priv);
2784                 if (ret)
2785                         rdma_destroy_id(&id_priv->id);
2786
2787                 mutex_lock(&lock);
2788         }
2789         mutex_unlock(&lock);
2790
2791         cma_deref_dev(cma_dev);
2792         wait_for_completion(&cma_dev->comp);
2793 }
2794
2795 static void cma_remove_one(struct ib_device *device)
2796 {
2797         struct cma_device *cma_dev;
2798
2799         cma_dev = ib_get_client_data(device, &cma_client);
2800         if (!cma_dev)
2801                 return;
2802
2803         mutex_lock(&lock);
2804         list_del(&cma_dev->list);
2805         mutex_unlock(&lock);
2806
2807         cma_process_remove(cma_dev);
2808         kfree(cma_dev);
2809 }
2810
2811 static int cma_init(void)
2812 {
2813         int ret, low, high, remaining;
2814
2815         get_random_bytes(&next_port, sizeof next_port);
2816         inet_get_local_port_range(&low, &high);
2817         remaining = (high - low) + 1;
2818         next_port = ((unsigned int) next_port % remaining) + low;
2819
2820         cma_wq = create_singlethread_workqueue("rdma_cm");
2821         if (!cma_wq)
2822                 return -ENOMEM;
2823
2824         ib_sa_register_client(&sa_client);
2825         rdma_addr_register_client(&addr_client);
2826
2827         ret = ib_register_client(&cma_client);
2828         if (ret)
2829                 goto err;
2830         return 0;
2831
2832 err:
2833         rdma_addr_unregister_client(&addr_client);
2834         ib_sa_unregister_client(&sa_client);
2835         destroy_workqueue(cma_wq);
2836         return ret;
2837 }
2838
2839 static void cma_cleanup(void)
2840 {
2841         ib_unregister_client(&cma_client);
2842         rdma_addr_unregister_client(&addr_client);
2843         ib_sa_unregister_client(&sa_client);
2844         destroy_workqueue(cma_wq);
2845         idr_destroy(&sdp_ps);
2846         idr_destroy(&tcp_ps);
2847         idr_destroy(&udp_ps);
2848         idr_destroy(&ipoib_ps);
2849 }
2850
2851 module_init(cma_init);
2852 module_exit(cma_cleanup);