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   1 /*
   2  * Copyright (c) 2005 Voltaire Inc.  All rights reserved.
   3  * Copyright (c) 2002-2005, Network Appliance, Inc. All rights reserved.
   4  * Copyright (c) 1999-2005, Mellanox Technologies, Inc. All rights reserved.
   5  * Copyright (c) 2005-2006 Intel Corporation.  All rights reserved.
   6  *
   7  * This software is available to you under a choice of one of two
   8  * licenses.  You may choose to be licensed under the terms of the GNU
   9  * General Public License (GPL) Version 2, available from the file
  10  * COPYING in the main directory of this source tree, or the
  11  * OpenIB.org BSD license below:
  12  *
  13  *     Redistribution and use in source and binary forms, with or
  14  *     without modification, are permitted provided that the following
  15  *     conditions are met:
  16  *
  17  *      - Redistributions of source code must retain the above
  18  *        copyright notice, this list of conditions and the following
  19  *        disclaimer.
  20  *
  21  *      - Redistributions in binary form must reproduce the above
  22  *        copyright notice, this list of conditions and the following
  23  *        disclaimer in the documentation and/or other materials
  24  *        provided with the distribution.
  25  *
  26  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  27  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  28  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  29  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  30  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  31  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  32  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  33  * SOFTWARE.
  34  */
  35
  36 #include <linux/completion.h>
  37 #include <linux/in.h>
  38 #include <linux/in6.h>
  39 #include <linux/mutex.h>
  40 #include <linux/random.h>
  41 #include <linux/idr.h>
  42 #include <linux/inetdevice.h>
  43 #include <linux/slab.h>
  44
  45 #include <net/tcp.h>
  46 #include <net/ipv6.h>
  47
  48 #include <rdma/rdma_cm.h>
  49 #include <rdma/rdma_cm_ib.h>
  50 #include <rdma/ib_cache.h>
  51 #include <rdma/ib_cm.h>
  52 #include <rdma/ib_sa.h>
  53 #include <rdma/iw_cm.h>
  54
  55 MODULE_AUTHOR("Sean Hefty");
  56 MODULE_DESCRIPTION("Generic RDMA CM Agent");
  57 MODULE_LICENSE("Dual BSD/GPL");
  58
  59 #define CMA_CM_RESPONSE_TIMEOUT 20
  60 #define CMA_MAX_CM_RETRIES 15
  61 #define CMA_CM_MRA_SETTING (IB_CM_MRA_FLAG_DELAY | 24)
  62
  63 static void cma_add_one(struct ib_device *device);
  64 static void cma_remove_one(struct ib_device *device);
  65
  66 static struct ib_client cma_client = {
  67         .name   = "cma",
  68         .add    = cma_add_one,
  69         .remove = cma_remove_one
  70 };
  71
  72 static struct ib_sa_client sa_client;
  73 static struct rdma_addr_client addr_client;
  74 static LIST_HEAD(dev_list);
  75 static LIST_HEAD(listen_any_list);
  76 static DEFINE_MUTEX(lock);
  77 static struct workqueue_struct *cma_wq;
  78 static DEFINE_IDR(sdp_ps);
  79 static DEFINE_IDR(tcp_ps);
  80 static DEFINE_IDR(udp_ps);
  81 static DEFINE_IDR(ipoib_ps);
  82 static int next_port;
  83
  84 struct cma_device {
  85         struct list_head        list;
  86         struct ib_device        *device;
  87         struct completion       comp;
  88         atomic_t                refcount;
  89         struct list_head        id_list;
  90 };
  91
  92 enum cma_state {
  93         CMA_IDLE,
  94         CMA_ADDR_QUERY,
  95         CMA_ADDR_RESOLVED,
  96         CMA_ROUTE_QUERY,
  97         CMA_ROUTE_RESOLVED,
  98         CMA_CONNECT,
  99         CMA_DISCONNECT,
 100         CMA_ADDR_BOUND,
 101         CMA_LISTEN,
 102         CMA_DEVICE_REMOVAL,
 103         CMA_DESTROYING
 104 };
 105
 106 struct rdma_bind_list {
 107         struct idr              *ps;
 108         struct hlist_head       owners;
 109         unsigned short          port;
 110 };
 111
 112 /*
 113  * Device removal can occur at anytime, so we need extra handling to
 114  * serialize notifying the user of device removal with other callbacks.
 115  * We do this by disabling removal notification while a callback is in process,
 116  * and reporting it after the callback completes.
 117  */
 118 struct rdma_id_private {
 119         struct rdma_cm_id       id;
 120
 121         struct rdma_bind_list   *bind_list;
 122         struct hlist_node       node;
 123         struct list_head        list; /* listen_any_list or cma_device.list */
 124         struct list_head        listen_list; /* per device listens */
 125         struct cma_device       *cma_dev;
 126         struct list_head        mc_list;
 127
 128         int                     internal_id;
 129         enum cma_state          state;
 130         spinlock_t              lock;
 131         struct mutex            qp_mutex;
 132
 133         struct completion       comp;
 134         atomic_t                refcount;
 135         struct mutex            handler_mutex;
 136
 137         int                     backlog;
 138         int                     timeout_ms;
 139         struct ib_sa_query      *query;
 140         int                     query_id;
 141         union {
 142                 struct ib_cm_id *ib;
 143                 struct iw_cm_id *iw;
 144         } cm_id;
 145
 146         u32                     seq_num;
 147         u32                     qkey;
 148         u32                     qp_num;
 149         u8                      srq;
 150         u8                      tos;
 151 };
 152
 153 struct cma_multicast {
 154         struct rdma_id_private *id_priv;
 155         union {
 156                 struct ib_sa_multicast *ib;
 157         } multicast;
 158         struct list_head        list;
 159         void                    *context;
 160         struct sockaddr_storage addr;
 161 };
 162
 163 struct cma_work {
 164         struct work_struct      work;
 165         struct rdma_id_private  *id;
 166         enum cma_state          old_state;
 167         enum cma_state          new_state;
 168         struct rdma_cm_event    event;
 169 };
 170
 171 struct cma_ndev_work {
 172         struct work_struct      work;
 173         struct rdma_id_private  *id;
 174         struct rdma_cm_event    event;
 175 };
 176
 177 union cma_ip_addr {
 178         struct in6_addr ip6;
 179         struct {
 180                 __be32 pad[3];
 181                 __be32 addr;
 182         } ip4;
 183 };
 184
 185 struct cma_hdr {
 186         u8 cma_version;
 187         u8 ip_version;  /* IP version: 7:4 */
 188         __be16 port;
 189         union cma_ip_addr src_addr;
 190         union cma_ip_addr dst_addr;
 191 };
 192
 193 struct sdp_hh {
 194         u8 bsdh[16];
 195         u8 sdp_version; /* Major version: 7:4 */
 196         u8 ip_version;  /* IP version: 7:4 */
 197         u8 sdp_specific1[10];
 198         __be16 port;
 199         __be16 sdp_specific2;
 200         union cma_ip_addr src_addr;
 201         union cma_ip_addr dst_addr;
 202 };
 203
 204 struct sdp_hah {
 205         u8 bsdh[16];
 206         u8 sdp_version;
 207 };
 208
 209 #define CMA_VERSION 0x00
 210 #define SDP_MAJ_VERSION 0x2
 211
 212 static int cma_comp(struct rdma_id_private *id_priv, enum cma_state comp)
 213 {
 214         unsigned long flags;
 215         int ret;
 216
 217         spin_lock_irqsave(&id_priv->lock, flags);
 218         ret = (id_priv->state == comp);
 219         spin_unlock_irqrestore(&id_priv->lock, flags);
 220         return ret;
 221 }
 222
 223 static int cma_comp_exch(struct rdma_id_private *id_priv,
 224                          enum cma_state comp, enum cma_state exch)
 225 {
 226         unsigned long flags;
 227         int ret;
 228
 229         spin_lock_irqsave(&id_priv->lock, flags);
 230         if ((ret = (id_priv->state == comp)))
 231                 id_priv->state = exch;
 232         spin_unlock_irqrestore(&id_priv->lock, flags);
 233         return ret;
 234 }
 235
 236 static enum cma_state cma_exch(struct rdma_id_private *id_priv,
 237                                enum cma_state exch)
 238 {
 239         unsigned long flags;
 240         enum cma_state old;
 241
 242         spin_lock_irqsave(&id_priv->lock, flags);
 243         old = id_priv->state;
 244         id_priv->state = exch;
 245         spin_unlock_irqrestore(&id_priv->lock, flags);
 246         return old;
 247 }
 248
 249 static inline u8 cma_get_ip_ver(struct cma_hdr *hdr)
 250 {
 251         return hdr->ip_version >> 4;
 252 }
 253
 254 static inline void cma_set_ip_ver(struct cma_hdr *hdr, u8 ip_ver)
 255 {
 256         hdr->ip_version = (ip_ver << 4) | (hdr->ip_version & 0xF);
 257 }
 258
 259 static inline u8 sdp_get_majv(u8 sdp_version)
 260 {
 261         return sdp_version >> 4;
 262 }
 263
 264 static inline u8 sdp_get_ip_ver(struct sdp_hh *hh)
 265 {
 266         return hh->ip_version >> 4;
 267 }
 268
 269 static inline void sdp_set_ip_ver(struct sdp_hh *hh, u8 ip_ver)
 270 {
 271         hh->ip_version = (ip_ver << 4) | (hh->ip_version & 0xF);
 272 }
 273
 274 static inline int cma_is_ud_ps(enum rdma_port_space ps)
 275 {
 276         return (ps == RDMA_PS_UDP || ps == RDMA_PS_IPOIB);
 277 }
 278
 279 static void cma_attach_to_dev(struct rdma_id_private *id_priv,
 280                               struct cma_device *cma_dev)
 281 {
 282         atomic_inc(&cma_dev->refcount);
 283         id_priv->cma_dev = cma_dev;
 284         id_priv->id.device = cma_dev->device;
 285         list_add_tail(&id_priv->list, &cma_dev->id_list);
 286 }
 287
 288 static inline void cma_deref_dev(struct cma_device *cma_dev)
 289 {
 290         if (atomic_dec_and_test(&cma_dev->refcount))
 291                 complete(&cma_dev->comp);
 292 }
 293
 294 static void cma_detach_from_dev(struct rdma_id_private *id_priv)
 295 {
 296         list_del(&id_priv->list);
 297         cma_deref_dev(id_priv->cma_dev);
 298         id_priv->cma_dev = NULL;
 299 }
 300
 301 static int cma_set_qkey(struct rdma_id_private *id_priv)
 302 {
 303         struct ib_sa_mcmember_rec rec;
 304         int ret = 0;
 305
 306         if (id_priv->qkey)
 307                 return 0;
 308
 309         switch (id_priv->id.ps) {
 310         case RDMA_PS_UDP:
 311                 id_priv->qkey = RDMA_UDP_QKEY;
 312                 break;
 313         case RDMA_PS_IPOIB:
 314                 ib_addr_get_mgid(&id_priv->id.route.addr.dev_addr, &rec.mgid);
 315                 ret = ib_sa_get_mcmember_rec(id_priv->id.device,
 316                                              id_priv->id.port_num, &rec.mgid,
 317                                              &rec);
 318                 if (!ret)
 319                         id_priv->qkey = be32_to_cpu(rec.qkey);
 320                 break;
 321         default:
 322                 break;
 323         }
 324         return ret;
 325 }
 326
 327 static int cma_acquire_dev(struct rdma_id_private *id_priv)
 328 {
 329         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
 330         struct cma_device *cma_dev;
 331         union ib_gid gid;
 332         int ret = -ENODEV;
 333
 334         rdma_addr_get_sgid(dev_addr, &gid);
 335         list_for_each_entry(cma_dev, &dev_list, list) {
 336                 ret = ib_find_cached_gid(cma_dev->device, &gid,
 337                                          &id_priv->id.port_num, NULL);
 338                 if (!ret) {
 339                         cma_attach_to_dev(id_priv, cma_dev);
 340                         break;
 341                 }
 342         }
 343         return ret;
 344 }
 345
 346 static void cma_deref_id(struct rdma_id_private *id_priv)
 347 {
 348         if (atomic_dec_and_test(&id_priv->refcount))
 349                 complete(&id_priv->comp);
 350 }
 351
 352 static int cma_disable_callback(struct rdma_id_private *id_priv,
 353                               enum cma_state state)
 354 {
 355         mutex_lock(&id_priv->handler_mutex);
 356         if (id_priv->state != state) {
 357                 mutex_unlock(&id_priv->handler_mutex);
 358                 return -EINVAL;
 359         }
 360         return 0;
 361 }
 362
 363 static int cma_has_cm_dev(struct rdma_id_private *id_priv)
 364 {
 365         return (id_priv->id.device && id_priv->cm_id.ib);
 366 }
 367
 368 struct rdma_cm_id *rdma_create_id(rdma_cm_event_handler event_handler,
 369                                   void *context, enum rdma_port_space ps)
 370 {
 371         struct rdma_id_private *id_priv;
 372
 373         id_priv = kzalloc(sizeof *id_priv, GFP_KERNEL);
 374         if (!id_priv)
 375                 return ERR_PTR(-ENOMEM);
 376
 377         id_priv->state = CMA_IDLE;
 378         id_priv->id.context = context;
 379         id_priv->id.event_handler = event_handler;
 380         id_priv->id.ps = ps;
 381         spin_lock_init(&id_priv->lock);
 382         mutex_init(&id_priv->qp_mutex);
 383         init_completion(&id_priv->comp);
 384         atomic_set(&id_priv->refcount, 1);
 385         mutex_init(&id_priv->handler_mutex);
 386         INIT_LIST_HEAD(&id_priv->listen_list);
 387         INIT_LIST_HEAD(&id_priv->mc_list);
 388         get_random_bytes(&id_priv->seq_num, sizeof id_priv->seq_num);
 389
 390         return &id_priv->id;
 391 }
 392 EXPORT_SYMBOL(rdma_create_id);
 393
 394 static int cma_init_ud_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
 395 {
 396         struct ib_qp_attr qp_attr;
 397         int qp_attr_mask, ret;
 398
 399         qp_attr.qp_state = IB_QPS_INIT;
 400         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 401         if (ret)
 402                 return ret;
 403
 404         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 405         if (ret)
 406                 return ret;
 407
 408         qp_attr.qp_state = IB_QPS_RTR;
 409         ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
 410         if (ret)
 411                 return ret;
 412
 413         qp_attr.qp_state = IB_QPS_RTS;
 414         qp_attr.sq_psn = 0;
 415         ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE | IB_QP_SQ_PSN);
 416
 417         return ret;
 418 }
 419
 420 static int cma_init_conn_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
 421 {
 422         struct ib_qp_attr qp_attr;
 423         int qp_attr_mask, ret;
 424
 425         qp_attr.qp_state = IB_QPS_INIT;
 426         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 427         if (ret)
 428                 return ret;
 429
 430         return ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 431 }
 432
 433 int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
 434                    struct ib_qp_init_attr *qp_init_attr)
 435 {
 436         struct rdma_id_private *id_priv;
 437         struct ib_qp *qp;
 438         int ret;
 439
 440         id_priv = container_of(id, struct rdma_id_private, id);
 441         if (id->device != pd->device)
 442                 return -EINVAL;
 443
 444         qp = ib_create_qp(pd, qp_init_attr);
 445         if (IS_ERR(qp))
 446                 return PTR_ERR(qp);
 447
 448         if (cma_is_ud_ps(id_priv->id.ps))
 449                 ret = cma_init_ud_qp(id_priv, qp);
 450         else
 451                 ret = cma_init_conn_qp(id_priv, qp);
 452         if (ret)
 453                 goto err;
 454
 455         id->qp = qp;
 456         id_priv->qp_num = qp->qp_num;
 457         id_priv->srq = (qp->srq != NULL);
 458         return 0;
 459 err:
 460         ib_destroy_qp(qp);
 461         return ret;
 462 }
 463 EXPORT_SYMBOL(rdma_create_qp);
 464
 465 void rdma_destroy_qp(struct rdma_cm_id *id)
 466 {
 467         struct rdma_id_private *id_priv;
 468
 469         id_priv = container_of(id, struct rdma_id_private, id);
 470         mutex_lock(&id_priv->qp_mutex);
 471         ib_destroy_qp(id_priv->id.qp);
 472         id_priv->id.qp = NULL;
 473         mutex_unlock(&id_priv->qp_mutex);
 474 }
 475 EXPORT_SYMBOL(rdma_destroy_qp);
 476
 477 static int cma_modify_qp_rtr(struct rdma_id_private *id_priv,
 478                              struct rdma_conn_param *conn_param)
 479 {
 480         struct ib_qp_attr qp_attr;
 481         int qp_attr_mask, ret;
 482
 483         mutex_lock(&id_priv->qp_mutex);
 484         if (!id_priv->id.qp) {
 485                 ret = 0;
 486                 goto out;
 487         }
 488
 489         /* Need to update QP attributes from default values. */
 490         qp_attr.qp_state = IB_QPS_INIT;
 491         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 492         if (ret)
 493                 goto out;
 494
 495         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
 496         if (ret)
 497                 goto out;
 498
 499         qp_attr.qp_state = IB_QPS_RTR;
 500         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 501         if (ret)
 502                 goto out;
 503
 504         if (conn_param)
 505                 qp_attr.max_dest_rd_atomic = conn_param->responder_resources;
 506         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
 507 out:
 508         mutex_unlock(&id_priv->qp_mutex);
 509         return ret;
 510 }
 511
 512 static int cma_modify_qp_rts(struct rdma_id_private *id_priv,
 513                              struct rdma_conn_param *conn_param)
 514 {
 515         struct ib_qp_attr qp_attr;
 516         int qp_attr_mask, ret;
 517
 518         mutex_lock(&id_priv->qp_mutex);
 519         if (!id_priv->id.qp) {
 520                 ret = 0;
 521                 goto out;
 522         }
 523
 524         qp_attr.qp_state = IB_QPS_RTS;
 525         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 526         if (ret)
 527                 goto out;
 528
 529         if (conn_param)
 530                 qp_attr.max_rd_atomic = conn_param->initiator_depth;
 531         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
 532 out:
 533         mutex_unlock(&id_priv->qp_mutex);
 534         return ret;
 535 }
 536
 537 static int cma_modify_qp_err(struct rdma_id_private *id_priv)
 538 {
 539         struct ib_qp_attr qp_attr;
 540         int ret;
 541
 542         mutex_lock(&id_priv->qp_mutex);
 543         if (!id_priv->id.qp) {
 544                 ret = 0;
 545                 goto out;
 546         }
 547
 548         qp_attr.qp_state = IB_QPS_ERR;
 549         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, IB_QP_STATE);
 550 out:
 551         mutex_unlock(&id_priv->qp_mutex);
 552         return ret;
 553 }
 554
 555 static int cma_ib_init_qp_attr(struct rdma_id_private *id_priv,
 556                                struct ib_qp_attr *qp_attr, int *qp_attr_mask)
 557 {
 558         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
 559         int ret;
 560
 561         ret = ib_find_cached_pkey(id_priv->id.device, id_priv->id.port_num,
 562                                   ib_addr_get_pkey(dev_addr),
 563                                   &qp_attr->pkey_index);
 564         if (ret)
 565                 return ret;
 566
 567         qp_attr->port_num = id_priv->id.port_num;
 568         *qp_attr_mask = IB_QP_STATE | IB_QP_PKEY_INDEX | IB_QP_PORT;
 569
 570         if (cma_is_ud_ps(id_priv->id.ps)) {
 571                 ret = cma_set_qkey(id_priv);
 572                 if (ret)
 573                         return ret;
 574
 575                 qp_attr->qkey = id_priv->qkey;
 576                 *qp_attr_mask |= IB_QP_QKEY;
 577         } else {
 578                 qp_attr->qp_access_flags = 0;
 579                 *qp_attr_mask |= IB_QP_ACCESS_FLAGS;
 580         }
 581         return 0;
 582 }
 583
 584 int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
 585                        int *qp_attr_mask)
 586 {
 587         struct rdma_id_private *id_priv;
 588         int ret = 0;
 589
 590         id_priv = container_of(id, struct rdma_id_private, id);
 591         switch (rdma_node_get_transport(id_priv->id.device->node_type)) {
 592         case RDMA_TRANSPORT_IB:
 593                 if (!id_priv->cm_id.ib || cma_is_ud_ps(id_priv->id.ps))
 594                         ret = cma_ib_init_qp_attr(id_priv, qp_attr, qp_attr_mask);
 595                 else
 596                         ret = ib_cm_init_qp_attr(id_priv->cm_id.ib, qp_attr,
 597                                                  qp_attr_mask);
 598                 if (qp_attr->qp_state == IB_QPS_RTR)
 599                         qp_attr->rq_psn = id_priv->seq_num;
 600                 break;
 601         case RDMA_TRANSPORT_IWARP:
 602                 if (!id_priv->cm_id.iw) {
 603                         qp_attr->qp_access_flags = 0;
 604                         *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS;
 605                 } else
 606                         ret = iw_cm_init_qp_attr(id_priv->cm_id.iw, qp_attr,
 607                                                  qp_attr_mask);
 608                 break;
 609         default:
 610                 ret = -ENOSYS;
 611                 break;
 612         }
 613
 614         return ret;
 615 }
 616 EXPORT_SYMBOL(rdma_init_qp_attr);
 617
 618 static inline int cma_zero_addr(struct sockaddr *addr)
 619 {
 620         struct in6_addr *ip6;
 621
 622         if (addr->sa_family == AF_INET)
 623                 return ipv4_is_zeronet(
 624                         ((struct sockaddr_in *)addr)->sin_addr.s_addr);
 625         else {
 626                 ip6 = &((struct sockaddr_in6 *) addr)->sin6_addr;
 627                 return (ip6->s6_addr32[0] | ip6->s6_addr32[1] |
 628                         ip6->s6_addr32[2] | ip6->s6_addr32[3]) == 0;
 629         }
 630 }
 631
 632 static inline int cma_loopback_addr(struct sockaddr *addr)
 633 {
 634         if (addr->sa_family == AF_INET)
 635                 return ipv4_is_loopback(
 636                         ((struct sockaddr_in *) addr)->sin_addr.s_addr);
 637         else
 638                 return ipv6_addr_loopback(
 639                         &((struct sockaddr_in6 *) addr)->sin6_addr);
 640 }
 641
 642 static inline int cma_any_addr(struct sockaddr *addr)
 643 {
 644         return cma_zero_addr(addr) || cma_loopback_addr(addr);
 645 }
 646
 647 static inline __be16 cma_port(struct sockaddr *addr)
 648 {
 649         if (addr->sa_family == AF_INET)
 650                 return ((struct sockaddr_in *) addr)->sin_port;
 651         else
 652                 return ((struct sockaddr_in6 *) addr)->sin6_port;
 653 }
 654
 655 static inline int cma_any_port(struct sockaddr *addr)
 656 {
 657         return !cma_port(addr);
 658 }
 659
 660 static int cma_get_net_info(void *hdr, enum rdma_port_space ps,
 661                             u8 *ip_ver, __be16 *port,
 662                             union cma_ip_addr **src, union cma_ip_addr **dst)
 663 {
 664         switch (ps) {
 665         case RDMA_PS_SDP:
 666                 if (sdp_get_majv(((struct sdp_hh *) hdr)->sdp_version) !=
 667                     SDP_MAJ_VERSION)
 668                         return -EINVAL;
 669
 670                 *ip_ver = sdp_get_ip_ver(hdr);
 671                 *port   = ((struct sdp_hh *) hdr)->port;
 672                 *src    = &((struct sdp_hh *) hdr)->src_addr;
 673                 *dst    = &((struct sdp_hh *) hdr)->dst_addr;
 674                 break;
 675         default:
 676                 if (((struct cma_hdr *) hdr)->cma_version != CMA_VERSION)
 677                         return -EINVAL;
 678
 679                 *ip_ver = cma_get_ip_ver(hdr);
 680                 *port   = ((struct cma_hdr *) hdr)->port;
 681                 *src    = &((struct cma_hdr *) hdr)->src_addr;
 682                 *dst    = &((struct cma_hdr *) hdr)->dst_addr;
 683                 break;
 684         }
 685
 686         if (*ip_ver != 4 && *ip_ver != 6)
 687                 return -EINVAL;
 688         return 0;
 689 }
 690
 691 static void cma_save_net_info(struct rdma_addr *addr,
 692                               struct rdma_addr *listen_addr,
 693                               u8 ip_ver, __be16 port,
 694                               union cma_ip_addr *src, union cma_ip_addr *dst)
 695 {
 696         struct sockaddr_in *listen4, *ip4;
 697         struct sockaddr_in6 *listen6, *ip6;
 698
 699         switch (ip_ver) {
 700         case 4:
 701                 listen4 = (struct sockaddr_in *) &listen_addr->src_addr;
 702                 ip4 = (struct sockaddr_in *) &addr->src_addr;
 703                 ip4->sin_family = listen4->sin_family;
 704                 ip4->sin_addr.s_addr = dst->ip4.addr;
 705                 ip4->sin_port = listen4->sin_port;
 706
 707                 ip4 = (struct sockaddr_in *) &addr->dst_addr;
 708                 ip4->sin_family = listen4->sin_family;
 709                 ip4->sin_addr.s_addr = src->ip4.addr;
 710                 ip4->sin_port = port;
 711                 break;
 712         case 6:
 713                 listen6 = (struct sockaddr_in6 *) &listen_addr->src_addr;
 714                 ip6 = (struct sockaddr_in6 *) &addr->src_addr;
 715                 ip6->sin6_family = listen6->sin6_family;
 716                 ip6->sin6_addr = dst->ip6;
 717                 ip6->sin6_port = listen6->sin6_port;
 718
 719                 ip6 = (struct sockaddr_in6 *) &addr->dst_addr;
 720                 ip6->sin6_family = listen6->sin6_family;
 721                 ip6->sin6_addr = src->ip6;
 722                 ip6->sin6_port = port;
 723                 break;
 724         default:
 725                 break;
 726         }
 727 }
 728
 729 static inline int cma_user_data_offset(enum rdma_port_space ps)
 730 {
 731         switch (ps) {
 732         case RDMA_PS_SDP:
 733                 return 0;
 734         default:
 735                 return sizeof(struct cma_hdr);
 736         }
 737 }
 738
 739 static void cma_cancel_route(struct rdma_id_private *id_priv)
 740 {
 741         switch (rdma_node_get_transport(id_priv->id.device->node_type)) {
 742         case RDMA_TRANSPORT_IB:
 743                 if (id_priv->query)
 744                         ib_sa_cancel_query(id_priv->query_id, id_priv->query);
 745                 break;
 746         default:
 747                 break;
 748         }
 749 }
 750
 751 static void cma_cancel_listens(struct rdma_id_private *id_priv)
 752 {
 753         struct rdma_id_private *dev_id_priv;
 754
 755         /*
 756          * Remove from listen_any_list to prevent added devices from spawning
 757          * additional listen requests.
 758          */
 759         mutex_lock(&lock);
 760         list_del(&id_priv->list);
 761
 762         while (!list_empty(&id_priv->listen_list)) {
 763                 dev_id_priv = list_entry(id_priv->listen_list.next,
 764                                          struct rdma_id_private, listen_list);
 765                 /* sync with device removal to avoid duplicate destruction */
 766                 list_del_init(&dev_id_priv->list);
 767                 list_del(&dev_id_priv->listen_list);
 768                 mutex_unlock(&lock);
 769
 770                 rdma_destroy_id(&dev_id_priv->id);
 771                 mutex_lock(&lock);
 772         }
 773         mutex_unlock(&lock);
 774 }
 775
 776 static void cma_cancel_operation(struct rdma_id_private *id_priv,
 777                                  enum cma_state state)
 778 {
 779         switch (state) {
 780         case CMA_ADDR_QUERY:
 781                 rdma_addr_cancel(&id_priv->id.route.addr.dev_addr);
 782                 break;
 783         case CMA_ROUTE_QUERY:
 784                 cma_cancel_route(id_priv);
 785                 break;
 786         case CMA_LISTEN:
 787                 if (cma_any_addr((struct sockaddr *) &id_priv->id.route.addr.src_addr)
 788                                 && !id_priv->cma_dev)
 789                         cma_cancel_listens(id_priv);
 790                 break;
 791         default:
 792                 break;
 793         }
 794 }
 795
 796 static void cma_release_port(struct rdma_id_private *id_priv)
 797 {
 798         struct rdma_bind_list *bind_list = id_priv->bind_list;
 799
 800         if (!bind_list)
 801                 return;
 802
 803         mutex_lock(&lock);
 804         hlist_del(&id_priv->node);
 805         if (hlist_empty(&bind_list->owners)) {
 806                 idr_remove(bind_list->ps, bind_list->port);
 807                 kfree(bind_list);
 808         }
 809         mutex_unlock(&lock);
 810 }
 811
 812 static void cma_leave_mc_groups(struct rdma_id_private *id_priv)
 813 {
 814         struct cma_multicast *mc;
 815
 816         while (!list_empty(&id_priv->mc_list)) {
 817                 mc = container_of(id_priv->mc_list.next,
 818                                   struct cma_multicast, list);
 819                 list_del(&mc->list);
 820                 ib_sa_free_multicast(mc->multicast.ib);
 821                 kfree(mc);
 822         }
 823 }
 824
 825 void rdma_destroy_id(struct rdma_cm_id *id)
 826 {
 827         struct rdma_id_private *id_priv;
 828         enum cma_state state;
 829
 830         id_priv = container_of(id, struct rdma_id_private, id);
 831         state = cma_exch(id_priv, CMA_DESTROYING);
 832         cma_cancel_operation(id_priv, state);
 833
 834         mutex_lock(&lock);
 835         if (id_priv->cma_dev) {
 836                 mutex_unlock(&lock);
 837                 switch (rdma_node_get_transport(id->device->node_type)) {
 838                 case RDMA_TRANSPORT_IB:
 839                         if (id_priv->cm_id.ib && !IS_ERR(id_priv->cm_id.ib))
 840                                 ib_destroy_cm_id(id_priv->cm_id.ib);
 841                         break;
 842                 case RDMA_TRANSPORT_IWARP:
 843                         if (id_priv->cm_id.iw && !IS_ERR(id_priv->cm_id.iw))
 844                                 iw_destroy_cm_id(id_priv->cm_id.iw);
 845                         break;
 846                 default:
 847                         break;
 848                 }
 849                 cma_leave_mc_groups(id_priv);
 850                 mutex_lock(&lock);
 851                 cma_detach_from_dev(id_priv);
 852         }
 853         mutex_unlock(&lock);
 854
 855         cma_release_port(id_priv);
 856         cma_deref_id(id_priv);
 857         wait_for_completion(&id_priv->comp);
 858
 859         if (id_priv->internal_id)
 860                 cma_deref_id(id_priv->id.context);
 861
 862         kfree(id_priv->id.route.path_rec);
 863         kfree(id_priv);
 864 }
 865 EXPORT_SYMBOL(rdma_destroy_id);
 866
 867 static int cma_rep_recv(struct rdma_id_private *id_priv)
 868 {
 869         int ret;
 870
 871         ret = cma_modify_qp_rtr(id_priv, NULL);
 872         if (ret)
 873                 goto reject;
 874
 875         ret = cma_modify_qp_rts(id_priv, NULL);
 876         if (ret)
 877                 goto reject;
 878
 879         ret = ib_send_cm_rtu(id_priv->cm_id.ib, NULL, 0);
 880         if (ret)
 881                 goto reject;
 882
 883         return 0;
 884 reject:
 885         cma_modify_qp_err(id_priv);
 886         ib_send_cm_rej(id_priv->cm_id.ib, IB_CM_REJ_CONSUMER_DEFINED,
 887                        NULL, 0, NULL, 0);
 888         return ret;
 889 }
 890
 891 static int cma_verify_rep(struct rdma_id_private *id_priv, void *data)
 892 {
 893         if (id_priv->id.ps == RDMA_PS_SDP &&
 894             sdp_get_majv(((struct sdp_hah *) data)->sdp_version) !=
 895             SDP_MAJ_VERSION)
 896                 return -EINVAL;
 897
 898         return 0;
 899 }
 900
 901 static void cma_set_rep_event_data(struct rdma_cm_event *event,
 902                                    struct ib_cm_rep_event_param *rep_data,
 903                                    void *private_data)
 904 {
 905         event->param.conn.private_data = private_data;
 906         event->param.conn.private_data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
 907         event->param.conn.responder_resources = rep_data->responder_resources;
 908         event->param.conn.initiator_depth = rep_data->initiator_depth;
 909         event->param.conn.flow_control = rep_data->flow_control;
 910         event->param.conn.rnr_retry_count = rep_data->rnr_retry_count;
 911         event->param.conn.srq = rep_data->srq;
 912         event->param.conn.qp_num = rep_data->remote_qpn;
 913 }
 914
 915 static int cma_ib_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
 916 {
 917         struct rdma_id_private *id_priv = cm_id->context;
 918         struct rdma_cm_event event;
 919         int ret = 0;
 920
 921         if ((ib_event->event != IB_CM_TIMEWAIT_EXIT &&
 922                 cma_disable_callback(id_priv, CMA_CONNECT)) ||
 923             (ib_event->event == IB_CM_TIMEWAIT_EXIT &&
 924                 cma_disable_callback(id_priv, CMA_DISCONNECT)))
 925                 return 0;
 926
 927         memset(&event, 0, sizeof event);
 928         switch (ib_event->event) {
 929         case IB_CM_REQ_ERROR:
 930         case IB_CM_REP_ERROR:
 931                 event.event = RDMA_CM_EVENT_UNREACHABLE;
 932                 event.status = -ETIMEDOUT;
 933                 break;
 934         case IB_CM_REP_RECEIVED:
 935                 event.status = cma_verify_rep(id_priv, ib_event->private_data);
 936                 if (event.status)
 937                         event.event = RDMA_CM_EVENT_CONNECT_ERROR;
 938                 else if (id_priv->id.qp && id_priv->id.ps != RDMA_PS_SDP) {
 939                         event.status = cma_rep_recv(id_priv);
 940                         event.event = event.status ? RDMA_CM_EVENT_CONNECT_ERROR :
 941                                                      RDMA_CM_EVENT_ESTABLISHED;
 942                 } else
 943                         event.event = RDMA_CM_EVENT_CONNECT_RESPONSE;
 944                 cma_set_rep_event_data(&event, &ib_event->param.rep_rcvd,
 945                                        ib_event->private_data);
 946                 break;
 947         case IB_CM_RTU_RECEIVED:
 948         case IB_CM_USER_ESTABLISHED:
 949                 event.event = RDMA_CM_EVENT_ESTABLISHED;
 950                 break;
 951         case IB_CM_DREQ_ERROR:
 952                 event.status = -ETIMEDOUT; /* fall through */
 953         case IB_CM_DREQ_RECEIVED:
 954         case IB_CM_DREP_RECEIVED:
 955                 if (!cma_comp_exch(id_priv, CMA_CONNECT, CMA_DISCONNECT))
 956                         goto out;
 957                 event.event = RDMA_CM_EVENT_DISCONNECTED;
 958                 break;
 959         case IB_CM_TIMEWAIT_EXIT:
 960                 event.event = RDMA_CM_EVENT_TIMEWAIT_EXIT;
 961                 break;
 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\n",
 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                 mutex_unlock(&id_priv->handler_mutex);
 984                 rdma_destroy_id(&id_priv->id);
 985                 return ret;
 986         }
 987 out:
 988         mutex_unlock(&id_priv->handler_mutex);
 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         __be16 port;
1000         u8 ip_ver;
1001         int ret;
1002
1003         if (cma_get_net_info(ib_event->private_data, listen_id->ps,
1004                              &ip_ver, &port, &src, &dst))
1005                 goto err;
1006
1007         id = rdma_create_id(listen_id->event_handler, listen_id->context,
1008                             listen_id->ps);
1009         if (IS_ERR(id))
1010                 goto err;
1011
1012         cma_save_net_info(&id->route.addr, &listen_id->route.addr,
1013                           ip_ver, port, src, dst);
1014
1015         rt = &id->route;
1016         rt->num_paths = ib_event->param.req_rcvd.alternate_path ? 2 : 1;
1017         rt->path_rec = kmalloc(sizeof *rt->path_rec * rt->num_paths,
1018                                GFP_KERNEL);
1019         if (!rt->path_rec)
1020                 goto destroy_id;
1021
1022         rt->path_rec[0] = *ib_event->param.req_rcvd.primary_path;
1023         if (rt->num_paths == 2)
1024                 rt->path_rec[1] = *ib_event->param.req_rcvd.alternate_path;
1025
1026         if (cma_any_addr((struct sockaddr *) &rt->addr.src_addr)) {
1027                 rt->addr.dev_addr.dev_type = ARPHRD_INFINIBAND;
1028                 rdma_addr_set_sgid(&rt->addr.dev_addr, &rt->path_rec[0].sgid);
1029                 ib_addr_set_pkey(&rt->addr.dev_addr, rt->path_rec[0].pkey);
1030         } else {
1031                 ret = rdma_translate_ip((struct sockaddr *) &rt->addr.src_addr,
1032                                         &rt->addr.dev_addr);
1033                 if (ret)
1034                         goto destroy_id;
1035         }
1036         rdma_addr_set_dgid(&rt->addr.dev_addr, &rt->path_rec[0].dgid);
1037
1038         id_priv = container_of(id, struct rdma_id_private, id);
1039         id_priv->state = CMA_CONNECT;
1040         return id_priv;
1041
1042 destroy_id:
1043         rdma_destroy_id(id);
1044 err:
1045         return NULL;
1046 }
1047
1048 static struct rdma_id_private *cma_new_udp_id(struct rdma_cm_id *listen_id,
1049                                               struct ib_cm_event *ib_event)
1050 {
1051         struct rdma_id_private *id_priv;
1052         struct rdma_cm_id *id;
1053         union cma_ip_addr *src, *dst;
1054         __be16 port;
1055         u8 ip_ver;
1056         int ret;
1057
1058         id = rdma_create_id(listen_id->event_handler, listen_id->context,
1059                             listen_id->ps);
1060         if (IS_ERR(id))
1061                 return NULL;
1062
1063
1064         if (cma_get_net_info(ib_event->private_data, listen_id->ps,
1065                              &ip_ver, &port, &src, &dst))
1066                 goto err;
1067
1068         cma_save_net_info(&id->route.addr, &listen_id->route.addr,
1069                           ip_ver, port, src, dst);
1070
1071         if (!cma_any_addr((struct sockaddr *) &id->route.addr.src_addr)) {
1072                 ret = rdma_translate_ip((struct sockaddr *) &id->route.addr.src_addr,
1073                                         &id->route.addr.dev_addr);
1074                 if (ret)
1075                         goto err;
1076         }
1077
1078         id_priv = container_of(id, struct rdma_id_private, id);
1079         id_priv->state = CMA_CONNECT;
1080         return id_priv;
1081 err:
1082         rdma_destroy_id(id);
1083         return NULL;
1084 }
1085
1086 static void cma_set_req_event_data(struct rdma_cm_event *event,
1087                                    struct ib_cm_req_event_param *req_data,
1088                                    void *private_data, int offset)
1089 {
1090         event->param.conn.private_data = private_data + offset;
1091         event->param.conn.private_data_len = IB_CM_REQ_PRIVATE_DATA_SIZE - offset;
1092         event->param.conn.responder_resources = req_data->responder_resources;
1093         event->param.conn.initiator_depth = req_data->initiator_depth;
1094         event->param.conn.flow_control = req_data->flow_control;
1095         event->param.conn.retry_count = req_data->retry_count;
1096         event->param.conn.rnr_retry_count = req_data->rnr_retry_count;
1097         event->param.conn.srq = req_data->srq;
1098         event->param.conn.qp_num = req_data->remote_qpn;
1099 }
1100
1101 static int cma_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
1102 {
1103         struct rdma_id_private *listen_id, *conn_id;
1104         struct rdma_cm_event event;
1105         int offset, ret;
1106
1107         listen_id = cm_id->context;
1108         if (cma_disable_callback(listen_id, CMA_LISTEN))
1109                 return -ECONNABORTED;
1110
1111         memset(&event, 0, sizeof event);
1112         offset = cma_user_data_offset(listen_id->id.ps);
1113         event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
1114         if (cma_is_ud_ps(listen_id->id.ps)) {
1115                 conn_id = cma_new_udp_id(&listen_id->id, ib_event);
1116                 event.param.ud.private_data = ib_event->private_data + offset;
1117                 event.param.ud.private_data_len =
1118                                 IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE - offset;
1119         } else {
1120                 conn_id = cma_new_conn_id(&listen_id->id, ib_event);
1121                 cma_set_req_event_data(&event, &ib_event->param.req_rcvd,
1122                                        ib_event->private_data, offset);
1123         }
1124         if (!conn_id) {
1125                 ret = -ENOMEM;
1126                 goto out;
1127         }
1128
1129         mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
1130         mutex_lock(&lock);
1131         ret = cma_acquire_dev(conn_id);
1132         mutex_unlock(&lock);
1133         if (ret)
1134                 goto release_conn_id;
1135
1136         conn_id->cm_id.ib = cm_id;
1137         cm_id->context = conn_id;
1138         cm_id->cm_handler = cma_ib_handler;
1139
1140         ret = conn_id->id.event_handler(&conn_id->id, &event);
1141         if (!ret) {
1142                 /*
1143                  * Acquire mutex to prevent user executing rdma_destroy_id()
1144                  * while we're accessing the cm_id.
1145                  */
1146                 mutex_lock(&lock);
1147                 if (cma_comp(conn_id, CMA_CONNECT) &&
1148                     !cma_is_ud_ps(conn_id->id.ps))
1149                         ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
1150                 mutex_unlock(&lock);
1151                 mutex_unlock(&conn_id->handler_mutex);
1152                 goto out;
1153         }
1154
1155         /* Destroy the CM ID by returning a non-zero value. */
1156         conn_id->cm_id.ib = NULL;
1157
1158 release_conn_id:
1159         cma_exch(conn_id, CMA_DESTROYING);
1160         mutex_unlock(&conn_id->handler_mutex);
1161         rdma_destroy_id(&conn_id->id);
1162
1163 out:
1164         mutex_unlock(&listen_id->handler_mutex);
1165         return ret;
1166 }
1167
1168 static __be64 cma_get_service_id(enum rdma_port_space ps, struct sockaddr *addr)
1169 {
1170         return cpu_to_be64(((u64)ps << 16) + be16_to_cpu(cma_port(addr)));
1171 }
1172
1173 static void cma_set_compare_data(enum rdma_port_space ps, struct sockaddr *addr,
1174                                  struct ib_cm_compare_data *compare)
1175 {
1176         struct cma_hdr *cma_data, *cma_mask;
1177         struct sdp_hh *sdp_data, *sdp_mask;
1178         __be32 ip4_addr;
1179         struct in6_addr ip6_addr;
1180
1181         memset(compare, 0, sizeof *compare);
1182         cma_data = (void *) compare->data;
1183         cma_mask = (void *) compare->mask;
1184         sdp_data = (void *) compare->data;
1185         sdp_mask = (void *) compare->mask;
1186
1187         switch (addr->sa_family) {
1188         case AF_INET:
1189                 ip4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
1190                 if (ps == RDMA_PS_SDP) {
1191                         sdp_set_ip_ver(sdp_data, 4);
1192                         sdp_set_ip_ver(sdp_mask, 0xF);
1193                         sdp_data->dst_addr.ip4.addr = ip4_addr;
1194                         sdp_mask->dst_addr.ip4.addr = htonl(~0);
1195                 } else {
1196                         cma_set_ip_ver(cma_data, 4);
1197                         cma_set_ip_ver(cma_mask, 0xF);
1198                         cma_data->dst_addr.ip4.addr = ip4_addr;
1199                         cma_mask->dst_addr.ip4.addr = htonl(~0);
1200                 }
1201                 break;
1202         case AF_INET6:
1203                 ip6_addr = ((struct sockaddr_in6 *) addr)->sin6_addr;
1204                 if (ps == RDMA_PS_SDP) {
1205                         sdp_set_ip_ver(sdp_data, 6);
1206                         sdp_set_ip_ver(sdp_mask, 0xF);
1207                         sdp_data->dst_addr.ip6 = ip6_addr;
1208                         memset(&sdp_mask->dst_addr.ip6, 0xFF,
1209                                sizeof sdp_mask->dst_addr.ip6);
1210                 } else {
1211                         cma_set_ip_ver(cma_data, 6);
1212                         cma_set_ip_ver(cma_mask, 0xF);
1213                         cma_data->dst_addr.ip6 = ip6_addr;
1214                         memset(&cma_mask->dst_addr.ip6, 0xFF,
1215                                sizeof cma_mask->dst_addr.ip6);
1216                 }
1217                 break;
1218         default:
1219                 break;
1220         }
1221 }
1222
1223 static int cma_iw_handler(struct iw_cm_id *iw_id, struct iw_cm_event *iw_event)
1224 {
1225         struct rdma_id_private *id_priv = iw_id->context;
1226         struct rdma_cm_event event;
1227         struct sockaddr_in *sin;
1228         int ret = 0;
1229
1230         if (cma_disable_callback(id_priv, CMA_CONNECT))
1231                 return 0;
1232
1233         memset(&event, 0, sizeof event);
1234         switch (iw_event->event) {
1235         case IW_CM_EVENT_CLOSE:
1236                 event.event = RDMA_CM_EVENT_DISCONNECTED;
1237                 break;
1238         case IW_CM_EVENT_CONNECT_REPLY:
1239                 sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1240                 *sin = iw_event->local_addr;
1241                 sin = (struct sockaddr_in *) &id_priv->id.route.addr.dst_addr;
1242                 *sin = iw_event->remote_addr;
1243                 switch (iw_event->status) {
1244                 case 0:
1245                         event.event = RDMA_CM_EVENT_ESTABLISHED;
1246                         break;
1247                 case -ECONNRESET:
1248                 case -ECONNREFUSED:
1249                         event.event = RDMA_CM_EVENT_REJECTED;
1250                         break;
1251                 case -ETIMEDOUT:
1252                         event.event = RDMA_CM_EVENT_UNREACHABLE;
1253                         break;
1254                 default:
1255                         event.event = RDMA_CM_EVENT_CONNECT_ERROR;
1256                         break;
1257                 }
1258                 break;
1259         case IW_CM_EVENT_ESTABLISHED:
1260                 event.event = RDMA_CM_EVENT_ESTABLISHED;
1261                 break;
1262         default:
1263                 BUG_ON(1);
1264         }
1265
1266         event.status = iw_event->status;
1267         event.param.conn.private_data = iw_event->private_data;
1268         event.param.conn.private_data_len = iw_event->private_data_len;
1269         ret = id_priv->id.event_handler(&id_priv->id, &event);
1270         if (ret) {
1271                 /* Destroy the CM ID by returning a non-zero value. */
1272                 id_priv->cm_id.iw = NULL;
1273                 cma_exch(id_priv, CMA_DESTROYING);
1274                 mutex_unlock(&id_priv->handler_mutex);
1275                 rdma_destroy_id(&id_priv->id);
1276                 return ret;
1277         }
1278
1279         mutex_unlock(&id_priv->handler_mutex);
1280         return ret;
1281 }
1282
1283 static int iw_conn_req_handler(struct iw_cm_id *cm_id,
1284                                struct iw_cm_event *iw_event)
1285 {
1286         struct rdma_cm_id *new_cm_id;
1287         struct rdma_id_private *listen_id, *conn_id;
1288         struct sockaddr_in *sin;
1289         struct net_device *dev = NULL;
1290         struct rdma_cm_event event;
1291         int ret;
1292         struct ib_device_attr attr;
1293
1294         listen_id = cm_id->context;
1295         if (cma_disable_callback(listen_id, CMA_LISTEN))
1296                 return -ECONNABORTED;
1297
1298         /* Create a new RDMA id for the new IW CM ID */
1299         new_cm_id = rdma_create_id(listen_id->id.event_handler,
1300                                    listen_id->id.context,
1301                                    RDMA_PS_TCP);
1302         if (IS_ERR(new_cm_id)) {
1303                 ret = -ENOMEM;
1304                 goto out;
1305         }
1306         conn_id = container_of(new_cm_id, struct rdma_id_private, id);
1307         mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
1308         conn_id->state = CMA_CONNECT;
1309
1310         dev = ip_dev_find(&init_net, iw_event->local_addr.sin_addr.s_addr);
1311         if (!dev) {
1312                 ret = -EADDRNOTAVAIL;
1313                 mutex_unlock(&conn_id->handler_mutex);
1314                 rdma_destroy_id(new_cm_id);
1315                 goto out;
1316         }
1317         ret = rdma_copy_addr(&conn_id->id.route.addr.dev_addr, dev, NULL);
1318         if (ret) {
1319                 mutex_unlock(&conn_id->handler_mutex);
1320                 rdma_destroy_id(new_cm_id);
1321                 goto out;
1322         }
1323
1324         mutex_lock(&lock);
1325         ret = cma_acquire_dev(conn_id);
1326         mutex_unlock(&lock);
1327         if (ret) {
1328                 mutex_unlock(&conn_id->handler_mutex);
1329                 rdma_destroy_id(new_cm_id);
1330                 goto out;
1331         }
1332
1333         conn_id->cm_id.iw = cm_id;
1334         cm_id->context = conn_id;
1335         cm_id->cm_handler = cma_iw_handler;
1336
1337         sin = (struct sockaddr_in *) &new_cm_id->route.addr.src_addr;
1338         *sin = iw_event->local_addr;
1339         sin = (struct sockaddr_in *) &new_cm_id->route.addr.dst_addr;
1340         *sin = iw_event->remote_addr;
1341
1342         ret = ib_query_device(conn_id->id.device, &attr);
1343         if (ret) {
1344                 mutex_unlock(&conn_id->handler_mutex);
1345                 rdma_destroy_id(new_cm_id);
1346                 goto out;
1347         }
1348
1349         memset(&event, 0, sizeof event);
1350         event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
1351         event.param.conn.private_data = iw_event->private_data;
1352         event.param.conn.private_data_len = iw_event->private_data_len;
1353         event.param.conn.initiator_depth = attr.max_qp_init_rd_atom;
1354         event.param.conn.responder_resources = attr.max_qp_rd_atom;
1355         ret = conn_id->id.event_handler(&conn_id->id, &event);
1356         if (ret) {
1357                 /* User wants to destroy the CM ID */
1358                 conn_id->cm_id.iw = NULL;
1359                 cma_exch(conn_id, CMA_DESTROYING);
1360                 mutex_unlock(&conn_id->handler_mutex);
1361                 rdma_destroy_id(&conn_id->id);
1362                 goto out;
1363         }
1364
1365         mutex_unlock(&conn_id->handler_mutex);
1366
1367 out:
1368         if (dev)
1369                 dev_put(dev);
1370         mutex_unlock(&listen_id->handler_mutex);
1371         return ret;
1372 }
1373
1374 static int cma_ib_listen(struct rdma_id_private *id_priv)
1375 {
1376         struct ib_cm_compare_data compare_data;
1377         struct sockaddr *addr;
1378         __be64 svc_id;
1379         int ret;
1380
1381         id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device, cma_req_handler,
1382                                             id_priv);
1383         if (IS_ERR(id_priv->cm_id.ib))
1384                 return PTR_ERR(id_priv->cm_id.ib);
1385
1386         addr = (struct sockaddr *) &id_priv->id.route.addr.src_addr;
1387         svc_id = cma_get_service_id(id_priv->id.ps, addr);
1388         if (cma_any_addr(addr))
1389                 ret = ib_cm_listen(id_priv->cm_id.ib, svc_id, 0, NULL);
1390         else {
1391                 cma_set_compare_data(id_priv->id.ps, addr, &compare_data);
1392                 ret = ib_cm_listen(id_priv->cm_id.ib, svc_id, 0, &compare_data);
1393         }
1394
1395         if (ret) {
1396                 ib_destroy_cm_id(id_priv->cm_id.ib);
1397                 id_priv->cm_id.ib = NULL;
1398         }
1399
1400         return ret;
1401 }
1402
1403 static int cma_iw_listen(struct rdma_id_private *id_priv, int backlog)
1404 {
1405         int ret;
1406         struct sockaddr_in *sin;
1407
1408         id_priv->cm_id.iw = iw_create_cm_id(id_priv->id.device,
1409                                             iw_conn_req_handler,
1410                                             id_priv);
1411         if (IS_ERR(id_priv->cm_id.iw))
1412                 return PTR_ERR(id_priv->cm_id.iw);
1413
1414         sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1415         id_priv->cm_id.iw->local_addr = *sin;
1416
1417         ret = iw_cm_listen(id_priv->cm_id.iw, backlog);
1418
1419         if (ret) {
1420                 iw_destroy_cm_id(id_priv->cm_id.iw);
1421                 id_priv->cm_id.iw = NULL;
1422         }
1423
1424         return ret;
1425 }
1426
1427 static int cma_listen_handler(struct rdma_cm_id *id,
1428                               struct rdma_cm_event *event)
1429 {
1430         struct rdma_id_private *id_priv = id->context;
1431
1432         id->context = id_priv->id.context;
1433         id->event_handler = id_priv->id.event_handler;
1434         return id_priv->id.event_handler(id, event);
1435 }
1436
1437 static void cma_listen_on_dev(struct rdma_id_private *id_priv,
1438                               struct cma_device *cma_dev)
1439 {
1440         struct rdma_id_private *dev_id_priv;
1441         struct rdma_cm_id *id;
1442         int ret;
1443
1444         id = rdma_create_id(cma_listen_handler, id_priv, id_priv->id.ps);
1445         if (IS_ERR(id))
1446                 return;
1447
1448         dev_id_priv = container_of(id, struct rdma_id_private, id);
1449
1450         dev_id_priv->state = CMA_ADDR_BOUND;
1451         memcpy(&id->route.addr.src_addr, &id_priv->id.route.addr.src_addr,
1452                ip_addr_size((struct sockaddr *) &id_priv->id.route.addr.src_addr));
1453
1454         cma_attach_to_dev(dev_id_priv, cma_dev);
1455         list_add_tail(&dev_id_priv->listen_list, &id_priv->listen_list);
1456         atomic_inc(&id_priv->refcount);
1457         dev_id_priv->internal_id = 1;
1458
1459         ret = rdma_listen(id, id_priv->backlog);
1460         if (ret)
1461                 printk(KERN_WARNING "RDMA CMA: cma_listen_on_dev, error %d, "
1462                        "listening on device %s\n", ret, cma_dev->device->name);
1463 }
1464
1465 static void cma_listen_on_all(struct rdma_id_private *id_priv)
1466 {
1467         struct cma_device *cma_dev;
1468
1469         mutex_lock(&lock);
1470         list_add_tail(&id_priv->list, &listen_any_list);
1471         list_for_each_entry(cma_dev, &dev_list, list)
1472                 cma_listen_on_dev(id_priv, cma_dev);
1473         mutex_unlock(&lock);
1474 }
1475
1476 int rdma_listen(struct rdma_cm_id *id, int backlog)
1477 {
1478         struct rdma_id_private *id_priv;
1479         int ret;
1480
1481         id_priv = container_of(id, struct rdma_id_private, id);
1482         if (id_priv->state == CMA_IDLE) {
1483                 ((struct sockaddr *) &id->route.addr.src_addr)->sa_family = AF_INET;
1484                 ret = rdma_bind_addr(id, (struct sockaddr *) &id->route.addr.src_addr);
1485                 if (ret)
1486                         return ret;
1487         }
1488
1489         if (!cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_LISTEN))
1490                 return -EINVAL;
1491
1492         id_priv->backlog = backlog;
1493         if (id->device) {
1494                 switch (rdma_node_get_transport(id->device->node_type)) {
1495                 case RDMA_TRANSPORT_IB:
1496                         ret = cma_ib_listen(id_priv);
1497                         if (ret)
1498                                 goto err;
1499                         break;
1500                 case RDMA_TRANSPORT_IWARP:
1501                         ret = cma_iw_listen(id_priv, backlog);
1502                         if (ret)
1503                                 goto err;
1504                         break;
1505                 default:
1506                         ret = -ENOSYS;
1507                         goto err;
1508                 }
1509         } else
1510                 cma_listen_on_all(id_priv);
1511
1512         return 0;
1513 err:
1514         id_priv->backlog = 0;
1515         cma_comp_exch(id_priv, CMA_LISTEN, CMA_ADDR_BOUND);
1516         return ret;
1517 }
1518 EXPORT_SYMBOL(rdma_listen);
1519
1520 void rdma_set_service_type(struct rdma_cm_id *id, int tos)
1521 {
1522         struct rdma_id_private *id_priv;
1523
1524         id_priv = container_of(id, struct rdma_id_private, id);
1525         id_priv->tos = (u8) tos;
1526 }
1527 EXPORT_SYMBOL(rdma_set_service_type);
1528
1529 static void cma_query_handler(int status, struct ib_sa_path_rec *path_rec,
1530                               void *context)
1531 {
1532         struct cma_work *work = context;
1533         struct rdma_route *route;
1534
1535         route = &work->id->id.route;
1536
1537         if (!status) {
1538                 route->num_paths = 1;
1539                 *route->path_rec = *path_rec;
1540         } else {
1541                 work->old_state = CMA_ROUTE_QUERY;
1542                 work->new_state = CMA_ADDR_RESOLVED;
1543                 work->event.event = RDMA_CM_EVENT_ROUTE_ERROR;
1544                 work->event.status = status;
1545         }
1546
1547         queue_work(cma_wq, &work->work);
1548 }
1549
1550 static int cma_query_ib_route(struct rdma_id_private *id_priv, int timeout_ms,
1551                               struct cma_work *work)
1552 {
1553         struct rdma_addr *addr = &id_priv->id.route.addr;
1554         struct ib_sa_path_rec path_rec;
1555         ib_sa_comp_mask comp_mask;
1556         struct sockaddr_in6 *sin6;
1557
1558         memset(&path_rec, 0, sizeof path_rec);
1559         rdma_addr_get_sgid(&addr->dev_addr, &path_rec.sgid);
1560         rdma_addr_get_dgid(&addr->dev_addr, &path_rec.dgid);
1561         path_rec.pkey = cpu_to_be16(ib_addr_get_pkey(&addr->dev_addr));
1562         path_rec.numb_path = 1;
1563         path_rec.reversible = 1;
1564         path_rec.service_id = cma_get_service_id(id_priv->id.ps,
1565                                                         (struct sockaddr *) &addr->dst_addr);
1566
1567         comp_mask = IB_SA_PATH_REC_DGID | IB_SA_PATH_REC_SGID |
1568                     IB_SA_PATH_REC_PKEY | IB_SA_PATH_REC_NUMB_PATH |
1569                     IB_SA_PATH_REC_REVERSIBLE | IB_SA_PATH_REC_SERVICE_ID;
1570
1571         if (addr->src_addr.ss_family == AF_INET) {
1572                 path_rec.qos_class = cpu_to_be16((u16) id_priv->tos);
1573                 comp_mask |= IB_SA_PATH_REC_QOS_CLASS;
1574         } else {
1575                 sin6 = (struct sockaddr_in6 *) &addr->src_addr;
1576                 path_rec.traffic_class = (u8) (be32_to_cpu(sin6->sin6_flowinfo) >> 20);
1577                 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
1578         }
1579
1580         id_priv->query_id = ib_sa_path_rec_get(&sa_client, id_priv->id.device,
1581                                                id_priv->id.port_num, &path_rec,
1582                                                comp_mask, timeout_ms,
1583                                                GFP_KERNEL, cma_query_handler,
1584                                                work, &id_priv->query);
1585
1586         return (id_priv->query_id < 0) ? id_priv->query_id : 0;
1587 }
1588
1589 static void cma_work_handler(struct work_struct *_work)
1590 {
1591         struct cma_work *work = container_of(_work, struct cma_work, work);
1592         struct rdma_id_private *id_priv = work->id;
1593         int destroy = 0;
1594
1595         mutex_lock(&id_priv->handler_mutex);
1596         if (!cma_comp_exch(id_priv, work->old_state, work->new_state))
1597                 goto out;
1598
1599         if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
1600                 cma_exch(id_priv, CMA_DESTROYING);
1601                 destroy = 1;
1602         }
1603 out:
1604         mutex_unlock(&id_priv->handler_mutex);
1605         cma_deref_id(id_priv);
1606         if (destroy)
1607                 rdma_destroy_id(&id_priv->id);
1608         kfree(work);
1609 }
1610
1611 static void cma_ndev_work_handler(struct work_struct *_work)
1612 {
1613         struct cma_ndev_work *work = container_of(_work, struct cma_ndev_work, work);
1614         struct rdma_id_private *id_priv = work->id;
1615         int destroy = 0;
1616
1617         mutex_lock(&id_priv->handler_mutex);
1618         if (id_priv->state == CMA_DESTROYING ||
1619             id_priv->state == CMA_DEVICE_REMOVAL)
1620                 goto out;
1621
1622         if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
1623                 cma_exch(id_priv, CMA_DESTROYING);
1624                 destroy = 1;
1625         }
1626
1627 out:
1628         mutex_unlock(&id_priv->handler_mutex);
1629         cma_deref_id(id_priv);
1630         if (destroy)
1631                 rdma_destroy_id(&id_priv->id);
1632         kfree(work);
1633 }
1634
1635 static int cma_resolve_ib_route(struct rdma_id_private *id_priv, int timeout_ms)
1636 {
1637         struct rdma_route *route = &id_priv->id.route;
1638         struct cma_work *work;
1639         int ret;
1640
1641         work = kzalloc(sizeof *work, GFP_KERNEL);
1642         if (!work)
1643                 return -ENOMEM;
1644
1645         work->id = id_priv;
1646         INIT_WORK(&work->work, cma_work_handler);
1647         work->old_state = CMA_ROUTE_QUERY;
1648         work->new_state = CMA_ROUTE_RESOLVED;
1649         work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
1650
1651         route->path_rec = kmalloc(sizeof *route->path_rec, GFP_KERNEL);
1652         if (!route->path_rec) {
1653                 ret = -ENOMEM;
1654                 goto err1;
1655         }
1656
1657         ret = cma_query_ib_route(id_priv, timeout_ms, work);
1658         if (ret)
1659                 goto err2;
1660
1661         return 0;
1662 err2:
1663         kfree(route->path_rec);
1664         route->path_rec = NULL;
1665 err1:
1666         kfree(work);
1667         return ret;
1668 }
1669
1670 int rdma_set_ib_paths(struct rdma_cm_id *id,
1671                       struct ib_sa_path_rec *path_rec, int num_paths)
1672 {
1673         struct rdma_id_private *id_priv;
1674         int ret;
1675
1676         id_priv = container_of(id, struct rdma_id_private, id);
1677         if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ROUTE_RESOLVED))
1678                 return -EINVAL;
1679
1680         id->route.path_rec = kmalloc(sizeof *path_rec * num_paths, GFP_KERNEL);
1681         if (!id->route.path_rec) {
1682                 ret = -ENOMEM;
1683                 goto err;
1684         }
1685
1686         memcpy(id->route.path_rec, path_rec, sizeof *path_rec * num_paths);
1687         return 0;
1688 err:
1689         cma_comp_exch(id_priv, CMA_ROUTE_RESOLVED, CMA_ADDR_RESOLVED);
1690         return ret;
1691 }
1692 EXPORT_SYMBOL(rdma_set_ib_paths);
1693
1694 static int cma_resolve_iw_route(struct rdma_id_private *id_priv, int timeout_ms)
1695 {
1696         struct cma_work *work;
1697
1698         work = kzalloc(sizeof *work, GFP_KERNEL);
1699         if (!work)
1700                 return -ENOMEM;
1701
1702         work->id = id_priv;
1703         INIT_WORK(&work->work, cma_work_handler);
1704         work->old_state = CMA_ROUTE_QUERY;
1705         work->new_state = CMA_ROUTE_RESOLVED;
1706         work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
1707         queue_work(cma_wq, &work->work);
1708         return 0;
1709 }
1710
1711 int rdma_resolve_route(struct rdma_cm_id *id, int timeout_ms)
1712 {
1713         struct rdma_id_private *id_priv;
1714         int ret;
1715
1716         id_priv = container_of(id, struct rdma_id_private, id);
1717         if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ROUTE_QUERY))
1718                 return -EINVAL;
1719
1720         atomic_inc(&id_priv->refcount);
1721         switch (rdma_node_get_transport(id->device->node_type)) {
1722         case RDMA_TRANSPORT_IB:
1723                 ret = cma_resolve_ib_route(id_priv, timeout_ms);
1724                 break;
1725         case RDMA_TRANSPORT_IWARP:
1726                 ret = cma_resolve_iw_route(id_priv, timeout_ms);
1727                 break;
1728         default:
1729                 ret = -ENOSYS;
1730                 break;
1731         }
1732         if (ret)
1733                 goto err;
1734
1735         return 0;
1736 err:
1737         cma_comp_exch(id_priv, CMA_ROUTE_QUERY, CMA_ADDR_RESOLVED);
1738         cma_deref_id(id_priv);
1739         return ret;
1740 }
1741 EXPORT_SYMBOL(rdma_resolve_route);
1742
1743 static int cma_bind_loopback(struct rdma_id_private *id_priv)
1744 {
1745         struct cma_device *cma_dev;
1746         struct ib_port_attr port_attr;
1747         union ib_gid gid;
1748         u16 pkey;
1749         int ret;
1750         u8 p;
1751
1752         mutex_lock(&lock);
1753         if (list_empty(&dev_list)) {
1754                 ret = -ENODEV;
1755                 goto out;
1756         }
1757         list_for_each_entry(cma_dev, &dev_list, list)
1758                 for (p = 1; p <= cma_dev->device->phys_port_cnt; ++p)
1759                         if (!ib_query_port(cma_dev->device, p, &port_attr) &&
1760                             port_attr.state == IB_PORT_ACTIVE)
1761                                 goto port_found;
1762
1763         p = 1;
1764         cma_dev = list_entry(dev_list.next, struct cma_device, list);
1765
1766 port_found:
1767         ret = ib_get_cached_gid(cma_dev->device, p, 0, &gid);
1768         if (ret)
1769                 goto out;
1770
1771         ret = ib_get_cached_pkey(cma_dev->device, p, 0, &pkey);
1772         if (ret)
1773                 goto out;
1774
1775         id_priv->id.route.addr.dev_addr.dev_type =
1776                 (rdma_node_get_transport(cma_dev->device->node_type) == RDMA_TRANSPORT_IB) ?
1777                 ARPHRD_INFINIBAND : ARPHRD_ETHER;
1778
1779         rdma_addr_set_sgid(&id_priv->id.route.addr.dev_addr, &gid);
1780         ib_addr_set_pkey(&id_priv->id.route.addr.dev_addr, pkey);
1781         id_priv->id.port_num = p;
1782         cma_attach_to_dev(id_priv, cma_dev);
1783 out:
1784         mutex_unlock(&lock);
1785         return ret;
1786 }
1787
1788 static void addr_handler(int status, struct sockaddr *src_addr,
1789                          struct rdma_dev_addr *dev_addr, void *context)
1790 {
1791         struct rdma_id_private *id_priv = context;
1792         struct rdma_cm_event event;
1793
1794         memset(&event, 0, sizeof event);
1795         mutex_lock(&id_priv->handler_mutex);
1796
1797         /*
1798          * Grab mutex to block rdma_destroy_id() from removing the device while
1799          * we're trying to acquire it.
1800          */
1801         mutex_lock(&lock);
1802         if (!cma_comp_exch(id_priv, CMA_ADDR_QUERY, CMA_ADDR_RESOLVED)) {
1803                 mutex_unlock(&lock);
1804                 goto out;
1805         }
1806
1807         if (!status && !id_priv->cma_dev)
1808                 status = cma_acquire_dev(id_priv);
1809         mutex_unlock(&lock);
1810
1811         if (status) {
1812                 if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ADDR_BOUND))
1813                         goto out;
1814                 event.event = RDMA_CM_EVENT_ADDR_ERROR;
1815                 event.status = status;
1816         } else {
1817                 memcpy(&id_priv->id.route.addr.src_addr, src_addr,
1818                        ip_addr_size(src_addr));
1819                 event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
1820         }
1821
1822         if (id_priv->id.event_handler(&id_priv->id, &event)) {
1823                 cma_exch(id_priv, CMA_DESTROYING);
1824                 mutex_unlock(&id_priv->handler_mutex);
1825                 cma_deref_id(id_priv);
1826                 rdma_destroy_id(&id_priv->id);
1827                 return;
1828         }
1829 out:
1830         mutex_unlock(&id_priv->handler_mutex);
1831         cma_deref_id(id_priv);
1832 }
1833
1834 static int cma_resolve_loopback(struct rdma_id_private *id_priv)
1835 {
1836         struct cma_work *work;
1837         struct sockaddr *src, *dst;
1838         union ib_gid gid;
1839         int ret;
1840
1841         work = kzalloc(sizeof *work, GFP_KERNEL);
1842         if (!work)
1843                 return -ENOMEM;
1844
1845         if (!id_priv->cma_dev) {
1846                 ret = cma_bind_loopback(id_priv);
1847                 if (ret)
1848                         goto err;
1849         }
1850
1851         rdma_addr_get_sgid(&id_priv->id.route.addr.dev_addr, &gid);
1852         rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, &gid);
1853
1854         src = (struct sockaddr *) &id_priv->id.route.addr.src_addr;
1855         if (cma_zero_addr(src)) {
1856                 dst = (struct sockaddr *) &id_priv->id.route.addr.dst_addr;
1857                 if ((src->sa_family = dst->sa_family) == AF_INET) {
1858                         ((struct sockaddr_in *) src)->sin_addr.s_addr =
1859                                 ((struct sockaddr_in *) dst)->sin_addr.s_addr;
1860                 } else {
1861                         ipv6_addr_copy(&((struct sockaddr_in6 *) src)->sin6_addr,
1862                                        &((struct sockaddr_in6 *) dst)->sin6_addr);
1863                 }
1864         }
1865
1866         work->id = id_priv;
1867         INIT_WORK(&work->work, cma_work_handler);
1868         work->old_state = CMA_ADDR_QUERY;
1869         work->new_state = CMA_ADDR_RESOLVED;
1870         work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
1871         queue_work(cma_wq, &work->work);
1872         return 0;
1873 err:
1874         kfree(work);
1875         return ret;
1876 }
1877
1878 static int cma_bind_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
1879                          struct sockaddr *dst_addr)
1880 {
1881         if (!src_addr || !src_addr->sa_family) {
1882                 src_addr = (struct sockaddr *) &id->route.addr.src_addr;
1883                 if ((src_addr->sa_family = dst_addr->sa_family) == AF_INET6) {
1884                         ((struct sockaddr_in6 *) src_addr)->sin6_scope_id =
1885                                 ((struct sockaddr_in6 *) dst_addr)->sin6_scope_id;
1886                 }
1887         }
1888         return rdma_bind_addr(id, src_addr);
1889 }
1890
1891 int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
1892                       struct sockaddr *dst_addr, int timeout_ms)
1893 {
1894         struct rdma_id_private *id_priv;
1895         int ret;
1896
1897         id_priv = container_of(id, struct rdma_id_private, id);
1898         if (id_priv->state == CMA_IDLE) {
1899                 ret = cma_bind_addr(id, src_addr, dst_addr);
1900                 if (ret)
1901                         return ret;
1902         }
1903
1904         if (!cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_ADDR_QUERY))
1905                 return -EINVAL;
1906
1907         atomic_inc(&id_priv->refcount);
1908         memcpy(&id->route.addr.dst_addr, dst_addr, ip_addr_size(dst_addr));
1909         if (cma_any_addr(dst_addr))
1910                 ret = cma_resolve_loopback(id_priv);
1911         else
1912                 ret = rdma_resolve_ip(&addr_client, (struct sockaddr *) &id->route.addr.src_addr,
1913                                       dst_addr, &id->route.addr.dev_addr,
1914                                       timeout_ms, addr_handler, id_priv);
1915         if (ret)
1916                 goto err;
1917
1918         return 0;
1919 err:
1920         cma_comp_exch(id_priv, CMA_ADDR_QUERY, CMA_ADDR_BOUND);
1921         cma_deref_id(id_priv);
1922         return ret;
1923 }
1924 EXPORT_SYMBOL(rdma_resolve_addr);
1925
1926 static void cma_bind_port(struct rdma_bind_list *bind_list,
1927                           struct rdma_id_private *id_priv)
1928 {
1929         struct sockaddr_in *sin;
1930
1931         sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1932         sin->sin_port = htons(bind_list->port);
1933         id_priv->bind_list = bind_list;
1934         hlist_add_head(&id_priv->node, &bind_list->owners);
1935 }
1936
1937 static int cma_alloc_port(struct idr *ps, struct rdma_id_private *id_priv,
1938                           unsigned short snum)
1939 {
1940         struct rdma_bind_list *bind_list;
1941         int port, ret;
1942
1943         bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL);
1944         if (!bind_list)
1945                 return -ENOMEM;
1946
1947         do {
1948                 ret = idr_get_new_above(ps, bind_list, snum, &port);
1949         } while ((ret == -EAGAIN) && idr_pre_get(ps, GFP_KERNEL));
1950
1951         if (ret)
1952                 goto err1;
1953
1954         if (port != snum) {
1955                 ret = -EADDRNOTAVAIL;
1956                 goto err2;
1957         }
1958
1959         bind_list->ps = ps;
1960         bind_list->port = (unsigned short) port;
1961         cma_bind_port(bind_list, id_priv);
1962         return 0;
1963 err2:
1964         idr_remove(ps, port);
1965 err1:
1966         kfree(bind_list);
1967         return ret;
1968 }
1969
1970 static int cma_alloc_any_port(struct idr *ps, struct rdma_id_private *id_priv)
1971 {
1972         struct rdma_bind_list *bind_list;
1973         int port, ret, low, high;
1974
1975         bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL);
1976         if (!bind_list)
1977                 return -ENOMEM;
1978
1979 retry:
1980         /* FIXME: add proper port randomization per like inet_csk_get_port */
1981         do {
1982                 ret = idr_get_new_above(ps, bind_list, next_port, &port);
1983         } while ((ret == -EAGAIN) && idr_pre_get(ps, GFP_KERNEL));
1984
1985         if (ret)
1986                 goto err1;
1987
1988         inet_get_local_port_range(&low, &high);
1989         if (port > high) {
1990                 if (next_port != low) {
1991                         idr_remove(ps, port);
1992                         next_port = low;
1993                         goto retry;
1994                 }
1995                 ret = -EADDRNOTAVAIL;
1996                 goto err2;
1997         }
1998
1999         if (port == high)
2000                 next_port = low;
2001         else
2002                 next_port = port + 1;
2003
2004         bind_list->ps = ps;
2005         bind_list->port = (unsigned short) port;
2006         cma_bind_port(bind_list, id_priv);
2007         return 0;
2008 err2:
2009         idr_remove(ps, port);
2010 err1:
2011         kfree(bind_list);
2012         return ret;
2013 }
2014
2015 static int cma_use_port(struct idr *ps, struct rdma_id_private *id_priv)
2016 {
2017         struct rdma_id_private *cur_id;
2018         struct sockaddr_in *sin, *cur_sin;
2019         struct rdma_bind_list *bind_list;
2020         struct hlist_node *node;
2021         unsigned short snum;
2022
2023         sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
2024         snum = ntohs(sin->sin_port);
2025         if (snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
2026                 return -EACCES;
2027
2028         bind_list = idr_find(ps, snum);
2029         if (!bind_list)
2030                 return cma_alloc_port(ps, id_priv, snum);
2031
2032         /*
2033          * We don't support binding to any address if anyone is bound to
2034          * a specific address on the same port.
2035          */
2036         if (cma_any_addr((struct sockaddr *) &id_priv->id.route.addr.src_addr))
2037                 return -EADDRNOTAVAIL;
2038
2039         hlist_for_each_entry(cur_id, node, &bind_list->owners, node) {
2040                 if (cma_any_addr((struct sockaddr *) &cur_id->id.route.addr.src_addr))
2041                         return -EADDRNOTAVAIL;
2042
2043                 cur_sin = (struct sockaddr_in *) &cur_id->id.route.addr.src_addr;
2044                 if (sin->sin_addr.s_addr == cur_sin->sin_addr.s_addr)
2045                         return -EADDRINUSE;
2046         }
2047
2048         cma_bind_port(bind_list, id_priv);
2049         return 0;
2050 }
2051
2052 static int cma_get_port(struct rdma_id_private *id_priv)
2053 {
2054         struct idr *ps;
2055         int ret;
2056
2057         switch (id_priv->id.ps) {
2058         case RDMA_PS_SDP:
2059                 ps = &sdp_ps;
2060                 break;
2061         case RDMA_PS_TCP:
2062                 ps = &tcp_ps;
2063                 break;
2064         case RDMA_PS_UDP:
2065                 ps = &udp_ps;
2066                 break;
2067         case RDMA_PS_IPOIB:
2068                 ps = &ipoib_ps;
2069                 break;
2070         default:
2071                 return -EPROTONOSUPPORT;
2072         }
2073
2074         mutex_lock(&lock);
2075         if (cma_any_port((struct sockaddr *) &id_priv->id.route.addr.src_addr))
2076                 ret = cma_alloc_any_port(ps, id_priv);
2077         else
2078                 ret = cma_use_port(ps, id_priv);
2079         mutex_unlock(&lock);
2080
2081         return ret;
2082 }
2083
2084 static int cma_check_linklocal(struct rdma_dev_addr *dev_addr,
2085                                struct sockaddr *addr)
2086 {
2087 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2088         struct sockaddr_in6 *sin6;
2089
2090         if (addr->sa_family != AF_INET6)
2091                 return 0;
2092
2093         sin6 = (struct sockaddr_in6 *) addr;
2094         if ((ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) &&
2095             !sin6->sin6_scope_id)
2096                         return -EINVAL;
2097
2098         dev_addr->bound_dev_if = sin6->sin6_scope_id;
2099 #endif
2100         return 0;
2101 }
2102
2103 int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr)
2104 {
2105         struct rdma_id_private *id_priv;
2106         int ret;
2107
2108         if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6)
2109                 return -EAFNOSUPPORT;
2110
2111         id_priv = container_of(id, struct rdma_id_private, id);
2112         if (!cma_comp_exch(id_priv, CMA_IDLE, CMA_ADDR_BOUND))
2113                 return -EINVAL;
2114
2115         ret = cma_check_linklocal(&id->route.addr.dev_addr, addr);
2116         if (ret)
2117                 goto err1;
2118
2119         if (!cma_any_addr(addr)) {
2120                 ret = rdma_translate_ip(addr, &id->route.addr.dev_addr);
2121                 if (ret)
2122                         goto err1;
2123
2124                 mutex_lock(&lock);
2125                 ret = cma_acquire_dev(id_priv);
2126                 mutex_unlock(&lock);
2127                 if (ret)
2128                         goto err1;
2129         }
2130
2131         memcpy(&id->route.addr.src_addr, addr, ip_addr_size(addr));
2132         ret = cma_get_port(id_priv);
2133         if (ret)
2134                 goto err2;
2135
2136         return 0;
2137 err2:
2138         if (id_priv->cma_dev) {
2139                 mutex_lock(&lock);
2140                 cma_detach_from_dev(id_priv);
2141                 mutex_unlock(&lock);
2142         }
2143 err1:
2144         cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_IDLE);
2145         return ret;
2146 }
2147 EXPORT_SYMBOL(rdma_bind_addr);
2148
2149 static int cma_format_hdr(void *hdr, enum rdma_port_space ps,
2150                           struct rdma_route *route)
2151 {
2152         struct cma_hdr *cma_hdr;
2153         struct sdp_hh *sdp_hdr;
2154
2155         if (route->addr.src_addr.ss_family == AF_INET) {
2156                 struct sockaddr_in *src4, *dst4;
2157
2158                 src4 = (struct sockaddr_in *) &route->addr.src_addr;
2159                 dst4 = (struct sockaddr_in *) &route->addr.dst_addr;
2160
2161                 switch (ps) {
2162                 case RDMA_PS_SDP:
2163                         sdp_hdr = hdr;
2164                         if (sdp_get_majv(sdp_hdr->sdp_version) != SDP_MAJ_VERSION)
2165                                 return -EINVAL;
2166                         sdp_set_ip_ver(sdp_hdr, 4);
2167                         sdp_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
2168                         sdp_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
2169                         sdp_hdr->port = src4->sin_port;
2170                         break;
2171                 default:
2172                         cma_hdr = hdr;
2173                         cma_hdr->cma_version = CMA_VERSION;
2174                         cma_set_ip_ver(cma_hdr, 4);
2175                         cma_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
2176                         cma_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
2177                         cma_hdr->port = src4->sin_port;
2178                         break;
2179                 }
2180         } else {
2181                 struct sockaddr_in6 *src6, *dst6;
2182
2183                 src6 = (struct sockaddr_in6 *) &route->addr.src_addr;
2184                 dst6 = (struct sockaddr_in6 *) &route->addr.dst_addr;
2185
2186                 switch (ps) {
2187                 case RDMA_PS_SDP:
2188                         sdp_hdr = hdr;
2189                         if (sdp_get_majv(sdp_hdr->sdp_version) != SDP_MAJ_VERSION)
2190                                 return -EINVAL;
2191                         sdp_set_ip_ver(sdp_hdr, 6);
2192                         sdp_hdr->src_addr.ip6 = src6->sin6_addr;
2193                         sdp_hdr->dst_addr.ip6 = dst6->sin6_addr;
2194                         sdp_hdr->port = src6->sin6_port;
2195                         break;
2196                 default:
2197                         cma_hdr = hdr;
2198                         cma_hdr->cma_version = CMA_VERSION;
2199                         cma_set_ip_ver(cma_hdr, 6);
2200                         cma_hdr->src_addr.ip6 = src6->sin6_addr;
2201                         cma_hdr->dst_addr.ip6 = dst6->sin6_addr;
2202                         cma_hdr->port = src6->sin6_port;
2203                         break;
2204                 }
2205         }
2206         return 0;
2207 }
2208
2209 static int cma_sidr_rep_handler(struct ib_cm_id *cm_id,
2210                                 struct ib_cm_event *ib_event)
2211 {
2212         struct rdma_id_private *id_priv = cm_id->context;
2213         struct rdma_cm_event event;
2214         struct ib_cm_sidr_rep_event_param *rep = &ib_event->param.sidr_rep_rcvd;
2215         int ret = 0;
2216
2217         if (cma_disable_callback(id_priv, CMA_CONNECT))
2218                 return 0;
2219
2220         memset(&event, 0, sizeof event);
2221         switch (ib_event->event) {
2222         case IB_CM_SIDR_REQ_ERROR:
2223                 event.event = RDMA_CM_EVENT_UNREACHABLE;
2224                 event.status = -ETIMEDOUT;
2225                 break;
2226         case IB_CM_SIDR_REP_RECEIVED:
2227                 event.param.ud.private_data = ib_event->private_data;
2228                 event.param.ud.private_data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
2229                 if (rep->status != IB_SIDR_SUCCESS) {
2230                         event.event = RDMA_CM_EVENT_UNREACHABLE;
2231                         event.status = ib_event->param.sidr_rep_rcvd.status;
2232                         break;
2233                 }
2234                 ret = cma_set_qkey(id_priv);
2235                 if (ret) {
2236                         event.event = RDMA_CM_EVENT_ADDR_ERROR;
2237                         event.status = -EINVAL;
2238                         break;
2239                 }
2240                 if (id_priv->qkey != rep->qkey) {
2241                         event.event = RDMA_CM_EVENT_UNREACHABLE;
2242                         event.status = -EINVAL;
2243                         break;
2244                 }
2245                 ib_init_ah_from_path(id_priv->id.device, id_priv->id.port_num,
2246                                      id_priv->id.route.path_rec,
2247                                      &event.param.ud.ah_attr);
2248                 event.param.ud.qp_num = rep->qpn;
2249                 event.param.ud.qkey = rep->qkey;
2250                 event.event = RDMA_CM_EVENT_ESTABLISHED;
2251                 event.status = 0;
2252                 break;
2253         default:
2254                 printk(KERN_ERR "RDMA CMA: unexpected IB CM event: %d\n",
2255                        ib_event->event);
2256                 goto out;
2257         }
2258
2259         ret = id_priv->id.event_handler(&id_priv->id, &event);
2260         if (ret) {
2261                 /* Destroy the CM ID by returning a non-zero value. */
2262                 id_priv->cm_id.ib = NULL;
2263                 cma_exch(id_priv, CMA_DESTROYING);
2264                 mutex_unlock(&id_priv->handler_mutex);
2265                 rdma_destroy_id(&id_priv->id);
2266                 return ret;
2267         }
2268 out:
2269         mutex_unlock(&id_priv->handler_mutex);
2270         return ret;
2271 }
2272
2273 static int cma_resolve_ib_udp(struct rdma_id_private *id_priv,
2274                               struct rdma_conn_param *conn_param)
2275 {
2276         struct ib_cm_sidr_req_param req;
2277         struct rdma_route *route;
2278         int ret;
2279
2280         req.private_data_len = sizeof(struct cma_hdr) +
2281                                conn_param->private_data_len;
2282         req.private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
2283         if (!req.private_data)
2284                 return -ENOMEM;
2285
2286         if (conn_param->private_data && conn_param->private_data_len)
2287                 memcpy((void *) req.private_data + sizeof(struct cma_hdr),
2288                        conn_param->private_data, conn_param->private_data_len);
2289
2290         route = &id_priv->id.route;
2291         ret = cma_format_hdr((void *) req.private_data, id_priv->id.ps, route);
2292         if (ret)
2293                 goto out;
2294
2295         id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device,
2296                                             cma_sidr_rep_handler, id_priv);
2297         if (IS_ERR(id_priv->cm_id.ib)) {
2298                 ret = PTR_ERR(id_priv->cm_id.ib);
2299                 goto out;
2300         }
2301
2302         req.path = route->path_rec;
2303         req.service_id = cma_get_service_id(id_priv->id.ps,
2304                                             (struct sockaddr *) &route->addr.dst_addr);
2305         req.timeout_ms = 1 << (CMA_CM_RESPONSE_TIMEOUT - 8);
2306         req.max_cm_retries = CMA_MAX_CM_RETRIES;
2307
2308         ret = ib_send_cm_sidr_req(id_priv->cm_id.ib, &req);
2309         if (ret) {
2310                 ib_destroy_cm_id(id_priv->cm_id.ib);
2311                 id_priv->cm_id.ib = NULL;
2312         }
2313 out:
2314         kfree(req.private_data);
2315         return ret;
2316 }
2317
2318 static int cma_connect_ib(struct rdma_id_private *id_priv,
2319                           struct rdma_conn_param *conn_param)
2320 {
2321         struct ib_cm_req_param req;
2322         struct rdma_route *route;
2323         void *private_data;
2324         int offset, ret;
2325
2326         memset(&req, 0, sizeof req);
2327         offset = cma_user_data_offset(id_priv->id.ps);
2328         req.private_data_len = offset + conn_param->private_data_len;
2329         private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
2330         if (!private_data)
2331                 return -ENOMEM;
2332
2333         if (conn_param->private_data && conn_param->private_data_len)
2334                 memcpy(private_data + offset, conn_param->private_data,
2335                        conn_param->private_data_len);
2336
2337         id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device, cma_ib_handler,
2338                                             id_priv);
2339         if (IS_ERR(id_priv->cm_id.ib)) {
2340                 ret = PTR_ERR(id_priv->cm_id.ib);
2341                 goto out;
2342         }
2343
2344         route = &id_priv->id.route;
2345         ret = cma_format_hdr(private_data, id_priv->id.ps, route);
2346         if (ret)
2347                 goto out;
2348         req.private_data = private_data;
2349
2350         req.primary_path = &route->path_rec[0];
2351         if (route->num_paths == 2)
2352                 req.alternate_path = &route->path_rec[1];
2353
2354         req.service_id = cma_get_service_id(id_priv->id.ps,
2355                                             (struct sockaddr *) &route->addr.dst_addr);
2356         req.qp_num = id_priv->qp_num;
2357         req.qp_type = IB_QPT_RC;
2358         req.starting_psn = id_priv->seq_num;
2359         req.responder_resources = conn_param->responder_resources;
2360         req.initiator_depth = conn_param->initiator_depth;
2361         req.flow_control = conn_param->flow_control;
2362         req.retry_count = conn_param->retry_count;
2363         req.rnr_retry_count = conn_param->rnr_retry_count;
2364         req.remote_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
2365         req.local_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
2366         req.max_cm_retries = CMA_MAX_CM_RETRIES;
2367         req.srq = id_priv->srq ? 1 : 0;
2368
2369         ret = ib_send_cm_req(id_priv->cm_id.ib, &req);
2370 out:
2371         if (ret && !IS_ERR(id_priv->cm_id.ib)) {
2372                 ib_destroy_cm_id(id_priv->cm_id.ib);
2373                 id_priv->cm_id.ib = NULL;
2374         }
2375
2376         kfree(private_data);
2377         return ret;
2378 }
2379
2380 static int cma_connect_iw(struct rdma_id_private *id_priv,
2381                           struct rdma_conn_param *conn_param)
2382 {
2383         struct iw_cm_id *cm_id;
2384         struct sockaddr_in* sin;
2385         int ret;
2386         struct iw_cm_conn_param iw_param;
2387
2388         cm_id = iw_create_cm_id(id_priv->id.device, cma_iw_handler, id_priv);
2389         if (IS_ERR(cm_id)) {
2390                 ret = PTR_ERR(cm_id);
2391                 goto out;
2392         }
2393
2394         id_priv->cm_id.iw = cm_id;
2395
2396         sin = (struct sockaddr_in*) &id_priv->id.route.addr.src_addr;
2397         cm_id->local_addr = *sin;
2398
2399         sin = (struct sockaddr_in*) &id_priv->id.route.addr.dst_addr;
2400         cm_id->remote_addr = *sin;
2401
2402         ret = cma_modify_qp_rtr(id_priv, conn_param);
2403         if (ret)
2404                 goto out;
2405
2406         iw_param.ord = conn_param->initiator_depth;
2407         iw_param.ird = conn_param->responder_resources;
2408         iw_param.private_data = conn_param->private_data;
2409         iw_param.private_data_len = conn_param->private_data_len;
2410         if (id_priv->id.qp)
2411                 iw_param.qpn = id_priv->qp_num;
2412         else
2413                 iw_param.qpn = conn_param->qp_num;
2414         ret = iw_cm_connect(cm_id, &iw_param);
2415 out:
2416         if (ret && !IS_ERR(cm_id)) {
2417                 iw_destroy_cm_id(cm_id);
2418                 id_priv->cm_id.iw = NULL;
2419         }
2420         return ret;
2421 }
2422
2423 int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
2424 {
2425         struct rdma_id_private *id_priv;
2426         int ret;
2427
2428         id_priv = container_of(id, struct rdma_id_private, id);
2429         if (!cma_comp_exch(id_priv, CMA_ROUTE_RESOLVED, CMA_CONNECT))
2430                 return -EINVAL;
2431
2432         if (!id->qp) {
2433                 id_priv->qp_num = conn_param->qp_num;
2434                 id_priv->srq = conn_param->srq;
2435         }
2436
2437         switch (rdma_node_get_transport(id->device->node_type)) {
2438         case RDMA_TRANSPORT_IB:
2439                 if (cma_is_ud_ps(id->ps))
2440                         ret = cma_resolve_ib_udp(id_priv, conn_param);
2441                 else
2442                         ret = cma_connect_ib(id_priv, conn_param);
2443                 break;
2444         case RDMA_TRANSPORT_IWARP:
2445                 ret = cma_connect_iw(id_priv, conn_param);
2446                 break;
2447         default:
2448                 ret = -ENOSYS;
2449                 break;
2450         }
2451         if (ret)
2452                 goto err;
2453
2454         return 0;
2455 err:
2456         cma_comp_exch(id_priv, CMA_CONNECT, CMA_ROUTE_RESOLVED);
2457         return ret;
2458 }
2459 EXPORT_SYMBOL(rdma_connect);
2460
2461 static int cma_accept_ib(struct rdma_id_private *id_priv,
2462                          struct rdma_conn_param *conn_param)
2463 {
2464         struct ib_cm_rep_param rep;
2465         int ret;
2466
2467         ret = cma_modify_qp_rtr(id_priv, conn_param);
2468         if (ret)
2469                 goto out;
2470
2471         ret = cma_modify_qp_rts(id_priv, conn_param);
2472         if (ret)
2473                 goto out;
2474
2475         memset(&rep, 0, sizeof rep);
2476         rep.qp_num = id_priv->qp_num;
2477         rep.starting_psn = id_priv->seq_num;
2478         rep.private_data = conn_param->private_data;
2479         rep.private_data_len = conn_param->private_data_len;
2480         rep.responder_resources = conn_param->responder_resources;
2481         rep.initiator_depth = conn_param->initiator_depth;
2482         rep.failover_accepted = 0;
2483         rep.flow_control = conn_param->flow_control;
2484         rep.rnr_retry_count = conn_param->rnr_retry_count;
2485         rep.srq = id_priv->srq ? 1 : 0;
2486
2487         ret = ib_send_cm_rep(id_priv->cm_id.ib, &rep);
2488 out:
2489         return ret;
2490 }
2491
2492 static int cma_accept_iw(struct rdma_id_private *id_priv,
2493                   struct rdma_conn_param *conn_param)
2494 {
2495         struct iw_cm_conn_param iw_param;
2496         int ret;
2497
2498         ret = cma_modify_qp_rtr(id_priv, conn_param);
2499         if (ret)
2500                 return ret;
2501
2502         iw_param.ord = conn_param->initiator_depth;
2503         iw_param.ird = conn_param->responder_resources;
2504         iw_param.private_data = conn_param->private_data;
2505         iw_param.private_data_len = conn_param->private_data_len;
2506         if (id_priv->id.qp) {
2507                 iw_param.qpn = id_priv->qp_num;
2508         } else
2509                 iw_param.qpn = conn_param->qp_num;
2510
2511         return iw_cm_accept(id_priv->cm_id.iw, &iw_param);
2512 }
2513
2514 static int cma_send_sidr_rep(struct rdma_id_private *id_priv,
2515                              enum ib_cm_sidr_status status,
2516                              const void *private_data, int private_data_len)
2517 {
2518         struct ib_cm_sidr_rep_param rep;
2519         int ret;
2520
2521         memset(&rep, 0, sizeof rep);
2522         rep.status = status;
2523         if (status == IB_SIDR_SUCCESS) {
2524                 ret = cma_set_qkey(id_priv);
2525                 if (ret)
2526                         return ret;
2527                 rep.qp_num = id_priv->qp_num;
2528                 rep.qkey = id_priv->qkey;
2529         }
2530         rep.private_data = private_data;
2531         rep.private_data_len = private_data_len;
2532
2533         return ib_send_cm_sidr_rep(id_priv->cm_id.ib, &rep);
2534 }
2535
2536 int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
2537 {
2538         struct rdma_id_private *id_priv;
2539         int ret;
2540
2541         id_priv = container_of(id, struct rdma_id_private, id);
2542         if (!cma_comp(id_priv, CMA_CONNECT))
2543                 return -EINVAL;
2544
2545         if (!id->qp && conn_param) {
2546                 id_priv->qp_num = conn_param->qp_num;
2547                 id_priv->srq = conn_param->srq;
2548         }
2549
2550         switch (rdma_node_get_transport(id->device->node_type)) {
2551         case RDMA_TRANSPORT_IB:
2552                 if (cma_is_ud_ps(id->ps))
2553                         ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
2554                                                 conn_param->private_data,
2555                                                 conn_param->private_data_len);
2556                 else if (conn_param)
2557                         ret = cma_accept_ib(id_priv, conn_param);
2558                 else
2559                         ret = cma_rep_recv(id_priv);
2560                 break;
2561         case RDMA_TRANSPORT_IWARP:
2562                 ret = cma_accept_iw(id_priv, conn_param);
2563                 break;
2564         default:
2565                 ret = -ENOSYS;
2566                 break;
2567         }
2568
2569         if (ret)
2570                 goto reject;
2571
2572         return 0;
2573 reject:
2574         cma_modify_qp_err(id_priv);
2575         rdma_reject(id, NULL, 0);
2576         return ret;
2577 }
2578 EXPORT_SYMBOL(rdma_accept);
2579
2580 int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event)
2581 {
2582         struct rdma_id_private *id_priv;
2583         int ret;
2584
2585         id_priv = container_of(id, struct rdma_id_private, id);
2586         if (!cma_has_cm_dev(id_priv))
2587                 return -EINVAL;
2588
2589         switch (id->device->node_type) {
2590         case RDMA_NODE_IB_CA:
2591                 ret = ib_cm_notify(id_priv->cm_id.ib, event);
2592                 break;
2593         default:
2594                 ret = 0;
2595                 break;
2596         }
2597         return ret;
2598 }
2599 EXPORT_SYMBOL(rdma_notify);
2600
2601 int rdma_reject(struct rdma_cm_id *id, const void *private_data,
2602                 u8 private_data_len)
2603 {
2604         struct rdma_id_private *id_priv;
2605         int ret;
2606
2607         id_priv = container_of(id, struct rdma_id_private, id);
2608         if (!cma_has_cm_dev(id_priv))
2609                 return -EINVAL;
2610
2611         switch (rdma_node_get_transport(id->device->node_type)) {
2612         case RDMA_TRANSPORT_IB:
2613                 if (cma_is_ud_ps(id->ps))
2614                         ret = cma_send_sidr_rep(id_priv, IB_SIDR_REJECT,
2615                                                 private_data, private_data_len);
2616                 else
2617                         ret = ib_send_cm_rej(id_priv->cm_id.ib,
2618                                              IB_CM_REJ_CONSUMER_DEFINED, NULL,
2619                                              0, private_data, private_data_len);
2620                 break;
2621         case RDMA_TRANSPORT_IWARP:
2622                 ret = iw_cm_reject(id_priv->cm_id.iw,
2623                                    private_data, private_data_len);
2624                 break;
2625         default:
2626                 ret = -ENOSYS;
2627                 break;
2628         }
2629         return ret;
2630 }
2631 EXPORT_SYMBOL(rdma_reject);
2632
2633 int rdma_disconnect(struct rdma_cm_id *id)
2634 {
2635         struct rdma_id_private *id_priv;
2636         int ret;
2637
2638         id_priv = container_of(id, struct rdma_id_private, id);
2639         if (!cma_has_cm_dev(id_priv))
2640                 return -EINVAL;
2641
2642         switch (rdma_node_get_transport(id->device->node_type)) {
2643         case RDMA_TRANSPORT_IB:
2644                 ret = cma_modify_qp_err(id_priv);
2645                 if (ret)
2646                         goto out;
2647                 /* Initiate or respond to a disconnect. */
2648                 if (ib_send_cm_dreq(id_priv->cm_id.ib, NULL, 0))
2649                         ib_send_cm_drep(id_priv->cm_id.ib, NULL, 0);
2650                 break;
2651         case RDMA_TRANSPORT_IWARP:
2652                 ret = iw_cm_disconnect(id_priv->cm_id.iw, 0);
2653                 break;
2654         default:
2655                 ret = -EINVAL;
2656                 break;
2657         }
2658 out:
2659         return ret;
2660 }
2661 EXPORT_SYMBOL(rdma_disconnect);
2662
2663 static int cma_ib_mc_handler(int status, struct ib_sa_multicast *multicast)
2664 {
2665         struct rdma_id_private *id_priv;
2666         struct cma_multicast *mc = multicast->context;
2667         struct rdma_cm_event event;
2668         int ret;
2669
2670         id_priv = mc->id_priv;
2671         if (cma_disable_callback(id_priv, CMA_ADDR_BOUND) &&
2672             cma_disable_callback(id_priv, CMA_ADDR_RESOLVED))
2673                 return 0;
2674
2675         mutex_lock(&id_priv->qp_mutex);
2676         if (!status && id_priv->id.qp)
2677                 status = ib_attach_mcast(id_priv->id.qp, &multicast->rec.mgid,
2678                                          multicast->rec.mlid);
2679         mutex_unlock(&id_priv->qp_mutex);
2680
2681         memset(&event, 0, sizeof event);
2682         event.status = status;
2683         event.param.ud.private_data = mc->context;
2684         if (!status) {
2685                 event.event = RDMA_CM_EVENT_MULTICAST_JOIN;
2686                 ib_init_ah_from_mcmember(id_priv->id.device,
2687                                          id_priv->id.port_num, &multicast->rec,
2688                                          &event.param.ud.ah_attr);
2689                 event.param.ud.qp_num = 0xFFFFFF;
2690                 event.param.ud.qkey = be32_to_cpu(multicast->rec.qkey);
2691         } else
2692                 event.event = RDMA_CM_EVENT_MULTICAST_ERROR;
2693
2694         ret = id_priv->id.event_handler(&id_priv->id, &event);
2695         if (ret) {
2696                 cma_exch(id_priv, CMA_DESTROYING);
2697                 mutex_unlock(&id_priv->handler_mutex);
2698                 rdma_destroy_id(&id_priv->id);
2699                 return 0;
2700         }
2701
2702         mutex_unlock(&id_priv->handler_mutex);
2703         return 0;
2704 }
2705
2706 static void cma_set_mgid(struct rdma_id_private *id_priv,
2707                          struct sockaddr *addr, union ib_gid *mgid)
2708 {
2709         unsigned char mc_map[MAX_ADDR_LEN];
2710         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
2711         struct sockaddr_in *sin = (struct sockaddr_in *) addr;
2712         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) addr;
2713
2714         if (cma_any_addr(addr)) {
2715                 memset(mgid, 0, sizeof *mgid);
2716         } else if ((addr->sa_family == AF_INET6) &&
2717                    ((be32_to_cpu(sin6->sin6_addr.s6_addr32[0]) & 0xFFF0FFFF) ==
2718                                                                  0xFF10A01B)) {
2719                 /* IPv6 address is an SA assigned MGID. */
2720                 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
2721         } else if ((addr->sa_family == AF_INET6)) {
2722                 ipv6_ib_mc_map(&sin6->sin6_addr, dev_addr->broadcast, mc_map);
2723                 if (id_priv->id.ps == RDMA_PS_UDP)
2724                         mc_map[7] = 0x01;       /* Use RDMA CM signature */
2725                 *mgid = *(union ib_gid *) (mc_map + 4);
2726         } else {
2727                 ip_ib_mc_map(sin->sin_addr.s_addr, dev_addr->broadcast, mc_map);
2728                 if (id_priv->id.ps == RDMA_PS_UDP)
2729                         mc_map[7] = 0x01;       /* Use RDMA CM signature */
2730                 *mgid = *(union ib_gid *) (mc_map + 4);
2731         }
2732 }
2733
2734 static int cma_join_ib_multicast(struct rdma_id_private *id_priv,
2735                                  struct cma_multicast *mc)
2736 {
2737         struct ib_sa_mcmember_rec rec;
2738         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
2739         ib_sa_comp_mask comp_mask;
2740         int ret;
2741
2742         ib_addr_get_mgid(dev_addr, &rec.mgid);
2743         ret = ib_sa_get_mcmember_rec(id_priv->id.device, id_priv->id.port_num,
2744                                      &rec.mgid, &rec);
2745         if (ret)
2746                 return ret;
2747
2748         cma_set_mgid(id_priv, (struct sockaddr *) &mc->addr, &rec.mgid);
2749         if (id_priv->id.ps == RDMA_PS_UDP)
2750                 rec.qkey = cpu_to_be32(RDMA_UDP_QKEY);
2751         rdma_addr_get_sgid(dev_addr, &rec.port_gid);
2752         rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
2753         rec.join_state = 1;
2754
2755         comp_mask = IB_SA_MCMEMBER_REC_MGID | IB_SA_MCMEMBER_REC_PORT_GID |
2756                     IB_SA_MCMEMBER_REC_PKEY | IB_SA_MCMEMBER_REC_JOIN_STATE |
2757                     IB_SA_MCMEMBER_REC_QKEY | IB_SA_MCMEMBER_REC_SL |
2758                     IB_SA_MCMEMBER_REC_FLOW_LABEL |
2759                     IB_SA_MCMEMBER_REC_TRAFFIC_CLASS;
2760
2761         if (id_priv->id.ps == RDMA_PS_IPOIB)
2762                 comp_mask |= IB_SA_MCMEMBER_REC_RATE |
2763                              IB_SA_MCMEMBER_REC_RATE_SELECTOR;
2764
2765         mc->multicast.ib = ib_sa_join_multicast(&sa_client, id_priv->id.device,
2766                                                 id_priv->id.port_num, &rec,
2767                                                 comp_mask, GFP_KERNEL,
2768                                                 cma_ib_mc_handler, mc);
2769         if (IS_ERR(mc->multicast.ib))
2770                 return PTR_ERR(mc->multicast.ib);
2771
2772         return 0;
2773 }
2774
2775 int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
2776                         void *context)
2777 {
2778         struct rdma_id_private *id_priv;
2779         struct cma_multicast *mc;
2780         int ret;
2781
2782         id_priv = container_of(id, struct rdma_id_private, id);
2783         if (!cma_comp(id_priv, CMA_ADDR_BOUND) &&
2784             !cma_comp(id_priv, CMA_ADDR_RESOLVED))
2785                 return -EINVAL;
2786
2787         mc = kmalloc(sizeof *mc, GFP_KERNEL);
2788         if (!mc)
2789                 return -ENOMEM;
2790
2791         memcpy(&mc->addr, addr, ip_addr_size(addr));
2792         mc->context = context;
2793         mc->id_priv = id_priv;
2794
2795         spin_lock(&id_priv->lock);
2796         list_add(&mc->list, &id_priv->mc_list);
2797         spin_unlock(&id_priv->lock);
2798
2799         switch (rdma_node_get_transport(id->device->node_type)) {
2800         case RDMA_TRANSPORT_IB:
2801                 ret = cma_join_ib_multicast(id_priv, mc);
2802                 break;
2803         default:
2804                 ret = -ENOSYS;
2805                 break;
2806         }
2807
2808         if (ret) {
2809                 spin_lock_irq(&id_priv->lock);
2810                 list_del(&mc->list);
2811                 spin_unlock_irq(&id_priv->lock);
2812                 kfree(mc);
2813         }
2814         return ret;
2815 }
2816 EXPORT_SYMBOL(rdma_join_multicast);
2817
2818 void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr)
2819 {
2820         struct rdma_id_private *id_priv;
2821         struct cma_multicast *mc;
2822
2823         id_priv = container_of(id, struct rdma_id_private, id);
2824         spin_lock_irq(&id_priv->lock);
2825         list_for_each_entry(mc, &id_priv->mc_list, list) {
2826                 if (!memcmp(&mc->addr, addr, ip_addr_size(addr))) {
2827                         list_del(&mc->list);
2828                         spin_unlock_irq(&id_priv->lock);
2829
2830                         if (id->qp)
2831                                 ib_detach_mcast(id->qp,
2832                                                 &mc->multicast.ib->rec.mgid,
2833                                                 mc->multicast.ib->rec.mlid);
2834                         ib_sa_free_multicast(mc->multicast.ib);
2835                         kfree(mc);
2836                         return;
2837                 }
2838         }
2839         spin_unlock_irq(&id_priv->lock);
2840 }
2841 EXPORT_SYMBOL(rdma_leave_multicast);
2842
2843 static int cma_netdev_change(struct net_device *ndev, struct rdma_id_private *id_priv)
2844 {
2845         struct rdma_dev_addr *dev_addr;
2846         struct cma_ndev_work *work;
2847
2848         dev_addr = &id_priv->id.route.addr.dev_addr;
2849
2850         if ((dev_addr->bound_dev_if == ndev->ifindex) &&
2851             memcmp(dev_addr->src_dev_addr, ndev->dev_addr, ndev->addr_len)) {
2852                 printk(KERN_INFO "RDMA CM addr change for ndev %s used by id %p\n",
2853                        ndev->name, &id_priv->id);
2854                 work = kzalloc(sizeof *work, GFP_KERNEL);
2855                 if (!work)
2856                         return -ENOMEM;
2857
2858                 INIT_WORK(&work->work, cma_ndev_work_handler);
2859                 work->id = id_priv;
2860                 work->event.event = RDMA_CM_EVENT_ADDR_CHANGE;
2861                 atomic_inc(&id_priv->refcount);
2862                 queue_work(cma_wq, &work->work);
2863         }
2864
2865         return 0;
2866 }
2867
2868 static int cma_netdev_callback(struct notifier_block *self, unsigned long event,
2869                                void *ctx)
2870 {
2871         struct net_device *ndev = (struct net_device *)ctx;
2872         struct cma_device *cma_dev;
2873         struct rdma_id_private *id_priv;
2874         int ret = NOTIFY_DONE;
2875
2876         if (dev_net(ndev) != &init_net)
2877                 return NOTIFY_DONE;
2878
2879         if (event != NETDEV_BONDING_FAILOVER)
2880                 return NOTIFY_DONE;
2881
2882         if (!(ndev->flags & IFF_MASTER) || !(ndev->priv_flags & IFF_BONDING))
2883                 return NOTIFY_DONE;
2884
2885         mutex_lock(&lock);
2886         list_for_each_entry(cma_dev, &dev_list, list)
2887                 list_for_each_entry(id_priv, &cma_dev->id_list, list) {
2888                         ret = cma_netdev_change(ndev, id_priv);
2889                         if (ret)
2890                                 goto out;
2891                 }
2892
2893 out:
2894         mutex_unlock(&lock);
2895         return ret;
2896 }
2897
2898 static struct notifier_block cma_nb = {
2899         .notifier_call = cma_netdev_callback
2900 };
2901
2902 static void cma_add_one(struct ib_device *device)
2903 {
2904         struct cma_device *cma_dev;
2905         struct rdma_id_private *id_priv;
2906
2907         cma_dev = kmalloc(sizeof *cma_dev, GFP_KERNEL);
2908         if (!cma_dev)
2909                 return;
2910
2911         cma_dev->device = device;
2912
2913         init_completion(&cma_dev->comp);
2914         atomic_set(&cma_dev->refcount, 1);
2915         INIT_LIST_HEAD(&cma_dev->id_list);
2916         ib_set_client_data(device, &cma_client, cma_dev);
2917
2918         mutex_lock(&lock);
2919         list_add_tail(&cma_dev->list, &dev_list);
2920         list_for_each_entry(id_priv, &listen_any_list, list)
2921                 cma_listen_on_dev(id_priv, cma_dev);
2922         mutex_unlock(&lock);
2923 }
2924
2925 static int cma_remove_id_dev(struct rdma_id_private *id_priv)
2926 {
2927         struct rdma_cm_event event;
2928         enum cma_state state;
2929         int ret = 0;
2930
2931         /* Record that we want to remove the device */
2932         state = cma_exch(id_priv, CMA_DEVICE_REMOVAL);
2933         if (state == CMA_DESTROYING)
2934                 return 0;
2935
2936         cma_cancel_operation(id_priv, state);
2937         mutex_lock(&id_priv->handler_mutex);
2938
2939         /* Check for destruction from another callback. */
2940         if (!cma_comp(id_priv, CMA_DEVICE_REMOVAL))
2941                 goto out;
2942
2943         memset(&event, 0, sizeof event);
2944         event.event = RDMA_CM_EVENT_DEVICE_REMOVAL;
2945         ret = id_priv->id.event_handler(&id_priv->id, &event);
2946 out:
2947         mutex_unlock(&id_priv->handler_mutex);
2948         return ret;
2949 }
2950
2951 static void cma_process_remove(struct cma_device *cma_dev)
2952 {
2953         struct rdma_id_private *id_priv;
2954         int ret;
2955
2956         mutex_lock(&lock);
2957         while (!list_empty(&cma_dev->id_list)) {
2958                 id_priv = list_entry(cma_dev->id_list.next,
2959                                      struct rdma_id_private, list);
2960
2961                 list_del(&id_priv->listen_list);
2962                 list_del_init(&id_priv->list);
2963                 atomic_inc(&id_priv->refcount);
2964                 mutex_unlock(&lock);
2965
2966                 ret = id_priv->internal_id ? 1 : cma_remove_id_dev(id_priv);
2967                 cma_deref_id(id_priv);
2968                 if (ret)
2969                         rdma_destroy_id(&id_priv->id);
2970
2971                 mutex_lock(&lock);
2972         }
2973         mutex_unlock(&lock);
2974
2975         cma_deref_dev(cma_dev);
2976         wait_for_completion(&cma_dev->comp);
2977 }
2978
2979 static void cma_remove_one(struct ib_device *device)
2980 {
2981         struct cma_device *cma_dev;
2982
2983         cma_dev = ib_get_client_data(device, &cma_client);
2984         if (!cma_dev)
2985                 return;
2986
2987         mutex_lock(&lock);
2988         list_del(&cma_dev->list);
2989         mutex_unlock(&lock);
2990
2991         cma_process_remove(cma_dev);
2992         kfree(cma_dev);
2993 }
2994
2995 static int __init cma_init(void)
2996 {
2997         int ret, low, high, remaining;
2998
2999         get_random_bytes(&next_port, sizeof next_port);
3000         inet_get_local_port_range(&low, &high);
3001         remaining = (high - low) + 1;
3002         next_port = ((unsigned int) next_port % remaining) + low;
3003
3004         cma_wq = create_singlethread_workqueue("rdma_cm");
3005         if (!cma_wq)
3006                 return -ENOMEM;
3007
3008         ib_sa_register_client(&sa_client);
3009         rdma_addr_register_client(&addr_client);
3010         register_netdevice_notifier(&cma_nb);
3011
3012         ret = ib_register_client(&cma_client);
3013         if (ret)
3014                 goto err;
3015         return 0;
3016
3017 err:
3018         unregister_netdevice_notifier(&cma_nb);
3019         rdma_addr_unregister_client(&addr_client);
3020         ib_sa_unregister_client(&sa_client);
3021         destroy_workqueue(cma_wq);
3022         return ret;
3023 }
3024
3025 static void __exit cma_cleanup(void)
3026 {
3027         ib_unregister_client(&cma_client);
3028         unregister_netdevice_notifier(&cma_nb);
3029         rdma_addr_unregister_client(&addr_client);
3030         ib_sa_unregister_client(&sa_client);
3031         destroy_workqueue(cma_wq);
3032         idr_destroy(&sdp_ps);
3033         idr_destroy(&tcp_ps);
3034         idr_destroy(&udp_ps);
3035         idr_destroy(&ipoib_ps);
3036 }
3037
3038 module_init(cma_init);
3039 module_exit(cma_cleanup);