drivers/infiniband/core/cma.c

   1 /*
   2  * Copyright (c) 2005 Voltaire Inc.  All rights reserved.
   3  * Copyright (c) 2002-2005, Network Appliance, Inc. All rights reserved.
   4  * Copyright (c) 1999-2005, Mellanox Technologies, Inc. All rights reserved.
   5  * Copyright (c) 2005-2006 Intel Corporation.  All rights reserved.
   6  *
   7  * This Software is licensed under one of the following licenses:
   8  *
   9  * 1) under the terms of the "Common Public License 1.0" a copy of which is
  10  *    available from the Open Source Initiative, see
  11  *    http://www.opensource.org/licenses/cpl.php.
  12  *
  13  * 2) under the terms of the "The BSD License" a copy of which is
  14  *    available from the Open Source Initiative, see
  15  *    http://www.opensource.org/licenses/bsd-license.php.
  16  *
  17  * 3) under the terms of the "GNU General Public License (GPL) Version 2" a
  18  *    copy of which is available from the Open Source Initiative, see
  19  *    http://www.opensource.org/licenses/gpl-license.php.
  20  *
  21  * Licensee has the right to choose one of the above licenses.
  22  *
  23  * Redistributions of source code must retain the above copyright
  24  * notice and one of the license notices.
  25  *
  26  * Redistributions in binary form must reproduce both the above copyright
  27  * notice, one of the license notices in the documentation
  28  * and/or other materials provided with the distribution.
  29  *
  30  */
  31
  32 #include <linux/completion.h>
  33 #include <linux/in.h>
  34 #include <linux/in6.h>
  35 #include <linux/mutex.h>
  36 #include <linux/random.h>
  37 #include <linux/idr.h>
  38 #include <linux/inetdevice.h>
  39
  40 #include <net/tcp.h>
  41
  42 #include <rdma/rdma_cm.h>
  43 #include <rdma/rdma_cm_ib.h>
  44 #include <rdma/ib_cache.h>
  45 #include <rdma/ib_cm.h>
  46 #include <rdma/ib_sa.h>
  47 #include <rdma/iw_cm.h>
  48
  49 MODULE_AUTHOR("Sean Hefty");
  50 MODULE_DESCRIPTION("Generic RDMA CM Agent");
  51 MODULE_LICENSE("Dual BSD/GPL");
  52
  53 #define CMA_CM_RESPONSE_TIMEOUT 20
  54 #define CMA_MAX_CM_RETRIES 15
  55
  56 static void cma_add_one(struct ib_device *device);
  57 static void cma_remove_one(struct ib_device *device);
  58
  59 static struct ib_client cma_client = {
  60         .name   = "cma",
  61         .add    = cma_add_one,
  62         .remove = cma_remove_one
  63 };
  64
  65 static struct ib_sa_client sa_client;
  66 static struct rdma_addr_client addr_client;
  67 static LIST_HEAD(dev_list);
  68 static LIST_HEAD(listen_any_list);
  69 static DEFINE_MUTEX(lock);
  70 static struct workqueue_struct *cma_wq;
  71 static DEFINE_IDR(sdp_ps);
  72 static DEFINE_IDR(tcp_ps);
  73
  74 struct cma_device {
  75         struct list_head        list;
  76         struct ib_device        *device;
  77         __be64                  node_guid;
  78         struct completion       comp;
  79         atomic_t                refcount;
  80         struct list_head        id_list;
  81 };
  82
  83 enum cma_state {
  84         CMA_IDLE,
  85         CMA_ADDR_QUERY,
  86         CMA_ADDR_RESOLVED,
  87         CMA_ROUTE_QUERY,
  88         CMA_ROUTE_RESOLVED,
  89         CMA_CONNECT,
  90         CMA_DISCONNECT,
  91         CMA_ADDR_BOUND,
  92         CMA_LISTEN,
  93         CMA_DEVICE_REMOVAL,
  94         CMA_DESTROYING
  95 };
  96
  97 struct rdma_bind_list {
  98         struct idr              *ps;
  99         struct hlist_head       owners;
 100         unsigned short          port;
 101 };
 102
 103 /*
 104  * Device removal can occur at anytime, so we need extra handling to
 105  * serialize notifying the user of device removal with other callbacks.
 106  * We do this by disabling removal notification while a callback is in process,
 107  * and reporting it after the callback completes.
 108  */
 109 struct rdma_id_private {
 110         struct rdma_cm_id       id;
 111
 112         struct rdma_bind_list   *bind_list;
 113         struct hlist_node       node;
 114         struct list_head        list;
 115         struct list_head        listen_list;
 116         struct cma_device       *cma_dev;
 117
 118         enum cma_state          state;
 119         spinlock_t              lock;
 120         struct completion       comp;
 121         atomic_t                refcount;
 122         wait_queue_head_t       wait_remove;
 123         atomic_t                dev_remove;
 124
 125         int                     backlog;
 126         int                     timeout_ms;
 127         struct ib_sa_query      *query;
 128         int                     query_id;
 129         union {
 130                 struct ib_cm_id *ib;
 131                 struct iw_cm_id *iw;
 132         } cm_id;
 133
 134         u32                     seq_num;
 135         u32                     qp_num;
 136         u8                      srq;
 137 };
 138
 139 struct cma_work {
 140         struct work_struct      work;
 141         struct rdma_id_private  *id;
 142         enum cma_state          old_state;
 143         enum cma_state          new_state;
 144         struct rdma_cm_event    event;
 145 };
 146
 147 union cma_ip_addr {
 148         struct in6_addr ip6;
 149         struct {
 150                 __u32 pad[3];
 151                 __u32 addr;
 152         } ip4;
 153 };
 154
 155 struct cma_hdr {
 156         u8 cma_version;
 157         u8 ip_version;  /* IP version: 7:4 */
 158         __u16 port;
 159         union cma_ip_addr src_addr;
 160         union cma_ip_addr dst_addr;
 161 };
 162
 163 struct sdp_hh {
 164         u8 bsdh[16];
 165         u8 sdp_version; /* Major version: 7:4 */
 166         u8 ip_version;  /* IP version: 7:4 */
 167         u8 sdp_specific1[10];
 168         __u16 port;
 169         __u16 sdp_specific2;
 170         union cma_ip_addr src_addr;
 171         union cma_ip_addr dst_addr;
 172 };
 173
 174 struct sdp_hah {
 175         u8 bsdh[16];
 176         u8 sdp_version;
 177 };
 178
 179 #define CMA_VERSION 0x00
 180 #define SDP_MAJ_VERSION 0x2
 181
 182 static int cma_comp(struct rdma_id_private *id_priv, enum cma_state comp)
 183 {
 184         unsigned long flags;
 185         int ret;
 186
 187         spin_lock_irqsave(&id_priv->lock, flags);
 188         ret = (id_priv->state == comp);
 189         spin_unlock_irqrestore(&id_priv->lock, flags);
 190         return ret;
 191 }
 192
 193 static int cma_comp_exch(struct rdma_id_private *id_priv,
 194                          enum cma_state comp, enum cma_state exch)
 195 {
 196         unsigned long flags;
 197         int ret;
 198
 199         spin_lock_irqsave(&id_priv->lock, flags);
 200         if ((ret = (id_priv->state == comp)))
 201                 id_priv->state = exch;
 202         spin_unlock_irqrestore(&id_priv->lock, flags);
 203         return ret;
 204 }
 205
 206 static enum cma_state cma_exch(struct rdma_id_private *id_priv,
 207                                enum cma_state exch)
 208 {
 209         unsigned long flags;
 210         enum cma_state old;
 211
 212         spin_lock_irqsave(&id_priv->lock, flags);
 213         old = id_priv->state;
 214         id_priv->state = exch;
 215         spin_unlock_irqrestore(&id_priv->lock, flags);
 216         return old;
 217 }
 218
 219 static inline u8 cma_get_ip_ver(struct cma_hdr *hdr)
 220 {
 221         return hdr->ip_version >> 4;
 222 }
 223
 224 static inline void cma_set_ip_ver(struct cma_hdr *hdr, u8 ip_ver)
 225 {
 226         hdr->ip_version = (ip_ver << 4) | (hdr->ip_version & 0xF);
 227 }
 228
 229 static inline u8 sdp_get_majv(u8 sdp_version)
 230 {
 231         return sdp_version >> 4;
 232 }
 233
 234 static inline u8 sdp_get_ip_ver(struct sdp_hh *hh)
 235 {
 236         return hh->ip_version >> 4;
 237 }
 238
 239 static inline void sdp_set_ip_ver(struct sdp_hh *hh, u8 ip_ver)
 240 {
 241         hh->ip_version = (ip_ver << 4) | (hh->ip_version & 0xF);
 242 }
 243
 244 static void cma_attach_to_dev(struct rdma_id_private *id_priv,
 245                               struct cma_device *cma_dev)
 246 {
 247         atomic_inc(&cma_dev->refcount);
 248         id_priv->cma_dev = cma_dev;
 249         id_priv->id.device = cma_dev->device;
 250         list_add_tail(&id_priv->list, &cma_dev->id_list);
 251 }
 252
 253 static inline void cma_deref_dev(struct cma_device *cma_dev)
 254 {
 255         if (atomic_dec_and_test(&cma_dev->refcount))
 256                 complete(&cma_dev->comp);
 257 }
 258
 259 static void cma_detach_from_dev(struct rdma_id_private *id_priv)
 260 {
 261         list_del(&id_priv->list);
 262         cma_deref_dev(id_priv->cma_dev);
 263         id_priv->cma_dev = NULL;
 264 }
 265
 266 static int cma_acquire_dev(struct rdma_id_private *id_priv)
 267 {
 268         enum rdma_node_type dev_type = id_priv->id.route.addr.dev_addr.dev_type;
 269         struct cma_device *cma_dev;
 270         union ib_gid gid;
 271         int ret = -ENODEV;
 272
 273         switch (rdma_node_get_transport(dev_type)) {
 274         case RDMA_TRANSPORT_IB:
 275                 ib_addr_get_sgid(&id_priv->id.route.addr.dev_addr, &gid);
 276                 break;
 277         case RDMA_TRANSPORT_IWARP:
 278                 iw_addr_get_sgid(&id_priv->id.route.addr.dev_addr, &gid);
 279                 break;
 280         default:
 281                 return -ENODEV;
 282         }
 283
 284         list_for_each_entry(cma_dev, &dev_list, list) {
 285                 ret = ib_find_cached_gid(cma_dev->device, &gid,
 286                                          &id_priv->id.port_num, NULL);
 287                 if (!ret) {
 288                         cma_attach_to_dev(id_priv, cma_dev);
 289                         break;
 290                 }
 291         }
 292         return ret;
 293 }
 294
 295 static void cma_deref_id(struct rdma_id_private *id_priv)
 296 {
 297         if (atomic_dec_and_test(&id_priv->refcount))
 298                 complete(&id_priv->comp);
 299 }
 300
 301 static void cma_release_remove(struct rdma_id_private *id_priv)
 302 {
 303         if (atomic_dec_and_test(&id_priv->dev_remove))
 304                 wake_up(&id_priv->wait_remove);
 305 }
 306
 307 struct rdma_cm_id *rdma_create_id(rdma_cm_event_handler event_handler,
 308                                   void *context, enum rdma_port_space ps)
 309 {
 310         struct rdma_id_private *id_priv;
 311
 312         id_priv = kzalloc(sizeof *id_priv, GFP_KERNEL);
 313         if (!id_priv)
 314                 return ERR_PTR(-ENOMEM);
 315
 316         id_priv->state = CMA_IDLE;
 317         id_priv->id.context = context;
 318         id_priv->id.event_handler = event_handler;
 319         id_priv->id.ps = ps;
 320         spin_lock_init(&id_priv->lock);
 321         init_completion(&id_priv->comp);
 322         atomic_set(&id_priv->refcount, 1);
 323         init_waitqueue_head(&id_priv->wait_remove);
 324         atomic_set(&id_priv->dev_remove, 0);
 325         INIT_LIST_HEAD(&id_priv->listen_list);
 326         get_random_bytes(&id_priv->seq_num, sizeof id_priv->seq_num);
 327
 328         return &id_priv->id;
 329 }
 330 EXPORT_SYMBOL(rdma_create_id);
 331
 332 static int cma_init_ib_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
 333 {
 334         struct ib_qp_attr qp_attr;
 335         struct rdma_dev_addr *dev_addr;
 336         int ret;
 337
 338         dev_addr = &id_priv->id.route.addr.dev_addr;
 339         ret = ib_find_cached_pkey(id_priv->id.device, id_priv->id.port_num,
 340                                   ib_addr_get_pkey(dev_addr),
 341                                   &qp_attr.pkey_index);
 342         if (ret)
 343                 return ret;
 344
 345         qp_attr.qp_state = IB_QPS_INIT;
 346         qp_attr.qp_access_flags = 0;
 347         qp_attr.port_num = id_priv->id.port_num;
 348         return ib_modify_qp(qp, &qp_attr, IB_QP_STATE | IB_QP_ACCESS_FLAGS |
 349                                           IB_QP_PKEY_INDEX | IB_QP_PORT);
 350 }
 351
 352 static int cma_init_iw_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
 353 {
 354         struct ib_qp_attr qp_attr;
 355
 356         qp_attr.qp_state = IB_QPS_INIT;
 357         qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE;
 358
 359         return ib_modify_qp(qp, &qp_attr, IB_QP_STATE | IB_QP_ACCESS_FLAGS);
 360 }
 361
 362 int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
 363                    struct ib_qp_init_attr *qp_init_attr)
 364 {
 365         struct rdma_id_private *id_priv;
 366         struct ib_qp *qp;
 367         int ret;
 368
 369         id_priv = container_of(id, struct rdma_id_private, id);
 370         if (id->device != pd->device)
 371                 return -EINVAL;
 372
 373         qp = ib_create_qp(pd, qp_init_attr);
 374         if (IS_ERR(qp))
 375                 return PTR_ERR(qp);
 376
 377         switch (rdma_node_get_transport(id->device->node_type)) {
 378         case RDMA_TRANSPORT_IB:
 379                 ret = cma_init_ib_qp(id_priv, qp);
 380                 break;
 381         case RDMA_TRANSPORT_IWARP:
 382                 ret = cma_init_iw_qp(id_priv, qp);
 383                 break;
 384         default:
 385                 ret = -ENOSYS;
 386                 break;
 387         }
 388
 389         if (ret)
 390                 goto err;
 391
 392         id->qp = qp;
 393         id_priv->qp_num = qp->qp_num;
 394         id_priv->srq = (qp->srq != NULL);
 395         return 0;
 396 err:
 397         ib_destroy_qp(qp);
 398         return ret;
 399 }
 400 EXPORT_SYMBOL(rdma_create_qp);
 401
 402 void rdma_destroy_qp(struct rdma_cm_id *id)
 403 {
 404         ib_destroy_qp(id->qp);
 405 }
 406 EXPORT_SYMBOL(rdma_destroy_qp);
 407
 408 static int cma_modify_qp_rtr(struct rdma_cm_id *id)
 409 {
 410         struct ib_qp_attr qp_attr;
 411         int qp_attr_mask, ret;
 412
 413         if (!id->qp)
 414                 return 0;
 415
 416         /* Need to update QP attributes from default values. */
 417         qp_attr.qp_state = IB_QPS_INIT;
 418         ret = rdma_init_qp_attr(id, &qp_attr, &qp_attr_mask);
 419         if (ret)
 420                 return ret;
 421
 422         ret = ib_modify_qp(id->qp, &qp_attr, qp_attr_mask);
 423         if (ret)
 424                 return ret;
 425
 426         qp_attr.qp_state = IB_QPS_RTR;
 427         ret = rdma_init_qp_attr(id, &qp_attr, &qp_attr_mask);
 428         if (ret)
 429                 return ret;
 430
 431         return ib_modify_qp(id->qp, &qp_attr, qp_attr_mask);
 432 }
 433
 434 static int cma_modify_qp_rts(struct rdma_cm_id *id)
 435 {
 436         struct ib_qp_attr qp_attr;
 437         int qp_attr_mask, ret;
 438
 439         if (!id->qp)
 440                 return 0;
 441
 442         qp_attr.qp_state = IB_QPS_RTS;
 443         ret = rdma_init_qp_attr(id, &qp_attr, &qp_attr_mask);
 444         if (ret)
 445                 return ret;
 446
 447         return ib_modify_qp(id->qp, &qp_attr, qp_attr_mask);
 448 }
 449
 450 static int cma_modify_qp_err(struct rdma_cm_id *id)
 451 {
 452         struct ib_qp_attr qp_attr;
 453
 454         if (!id->qp)
 455                 return 0;
 456
 457         qp_attr.qp_state = IB_QPS_ERR;
 458         return ib_modify_qp(id->qp, &qp_attr, IB_QP_STATE);
 459 }
 460
 461 int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
 462                        int *qp_attr_mask)
 463 {
 464         struct rdma_id_private *id_priv;
 465         int ret;
 466
 467         id_priv = container_of(id, struct rdma_id_private, id);
 468         switch (rdma_node_get_transport(id_priv->id.device->node_type)) {
 469         case RDMA_TRANSPORT_IB:
 470                 ret = ib_cm_init_qp_attr(id_priv->cm_id.ib, qp_attr,
 471                                          qp_attr_mask);
 472                 if (qp_attr->qp_state == IB_QPS_RTR)
 473                         qp_attr->rq_psn = id_priv->seq_num;
 474                 break;
 475         case RDMA_TRANSPORT_IWARP:
 476                 ret = iw_cm_init_qp_attr(id_priv->cm_id.iw, qp_attr,
 477                                         qp_attr_mask);
 478                 break;
 479         default:
 480                 ret = -ENOSYS;
 481                 break;
 482         }
 483
 484         return ret;
 485 }
 486 EXPORT_SYMBOL(rdma_init_qp_attr);
 487
 488 static inline int cma_zero_addr(struct sockaddr *addr)
 489 {
 490         struct in6_addr *ip6;
 491
 492         if (addr->sa_family == AF_INET)
 493                 return ZERONET(((struct sockaddr_in *) addr)->sin_addr.s_addr);
 494         else {
 495                 ip6 = &((struct sockaddr_in6 *) addr)->sin6_addr;
 496                 return (ip6->s6_addr32[0] | ip6->s6_addr32[1] |
 497                         ip6->s6_addr32[2] | ip6->s6_addr32[3]) == 0;
 498         }
 499 }
 500
 501 static inline int cma_loopback_addr(struct sockaddr *addr)
 502 {
 503         return LOOPBACK(((struct sockaddr_in *) addr)->sin_addr.s_addr);
 504 }
 505
 506 static inline int cma_any_addr(struct sockaddr *addr)
 507 {
 508         return cma_zero_addr(addr) || cma_loopback_addr(addr);
 509 }
 510
 511 static inline int cma_any_port(struct sockaddr *addr)
 512 {
 513         return !((struct sockaddr_in *) addr)->sin_port;
 514 }
 515
 516 static int cma_get_net_info(void *hdr, enum rdma_port_space ps,
 517                             u8 *ip_ver, __u16 *port,
 518                             union cma_ip_addr **src, union cma_ip_addr **dst)
 519 {
 520         switch (ps) {
 521         case RDMA_PS_SDP:
 522                 if (sdp_get_majv(((struct sdp_hh *) hdr)->sdp_version) !=
 523                     SDP_MAJ_VERSION)
 524                         return -EINVAL;
 525
 526                 *ip_ver = sdp_get_ip_ver(hdr);
 527                 *port   = ((struct sdp_hh *) hdr)->port;
 528                 *src    = &((struct sdp_hh *) hdr)->src_addr;
 529                 *dst    = &((struct sdp_hh *) hdr)->dst_addr;
 530                 break;
 531         default:
 532                 if (((struct cma_hdr *) hdr)->cma_version != CMA_VERSION)
 533                         return -EINVAL;
 534
 535                 *ip_ver = cma_get_ip_ver(hdr);
 536                 *port   = ((struct cma_hdr *) hdr)->port;
 537                 *src    = &((struct cma_hdr *) hdr)->src_addr;
 538                 *dst    = &((struct cma_hdr *) hdr)->dst_addr;
 539                 break;
 540         }
 541
 542         if (*ip_ver != 4 && *ip_ver != 6)
 543                 return -EINVAL;
 544         return 0;
 545 }
 546
 547 static void cma_save_net_info(struct rdma_addr *addr,
 548                               struct rdma_addr *listen_addr,
 549                               u8 ip_ver, __u16 port,
 550                               union cma_ip_addr *src, union cma_ip_addr *dst)
 551 {
 552         struct sockaddr_in *listen4, *ip4;
 553         struct sockaddr_in6 *listen6, *ip6;
 554
 555         switch (ip_ver) {
 556         case 4:
 557                 listen4 = (struct sockaddr_in *) &listen_addr->src_addr;
 558                 ip4 = (struct sockaddr_in *) &addr->src_addr;
 559                 ip4->sin_family = listen4->sin_family;
 560                 ip4->sin_addr.s_addr = dst->ip4.addr;
 561                 ip4->sin_port = listen4->sin_port;
 562
 563                 ip4 = (struct sockaddr_in *) &addr->dst_addr;
 564                 ip4->sin_family = listen4->sin_family;
 565                 ip4->sin_addr.s_addr = src->ip4.addr;
 566                 ip4->sin_port = port;
 567                 break;
 568         case 6:
 569                 listen6 = (struct sockaddr_in6 *) &listen_addr->src_addr;
 570                 ip6 = (struct sockaddr_in6 *) &addr->src_addr;
 571                 ip6->sin6_family = listen6->sin6_family;
 572                 ip6->sin6_addr = dst->ip6;
 573                 ip6->sin6_port = listen6->sin6_port;
 574
 575                 ip6 = (struct sockaddr_in6 *) &addr->dst_addr;
 576                 ip6->sin6_family = listen6->sin6_family;
 577                 ip6->sin6_addr = src->ip6;
 578                 ip6->sin6_port = port;
 579                 break;
 580         default:
 581                 break;
 582         }
 583 }
 584
 585 static inline int cma_user_data_offset(enum rdma_port_space ps)
 586 {
 587         switch (ps) {
 588         case RDMA_PS_SDP:
 589                 return 0;
 590         default:
 591                 return sizeof(struct cma_hdr);
 592         }
 593 }
 594
 595 static void cma_cancel_route(struct rdma_id_private *id_priv)
 596 {
 597         switch (rdma_node_get_transport(id_priv->id.device->node_type)) {
 598         case RDMA_TRANSPORT_IB:
 599                 if (id_priv->query)
 600                         ib_sa_cancel_query(id_priv->query_id, id_priv->query);
 601                 break;
 602         default:
 603                 break;
 604         }
 605 }
 606
 607 static inline int cma_internal_listen(struct rdma_id_private *id_priv)
 608 {
 609         return (id_priv->state == CMA_LISTEN) && id_priv->cma_dev &&
 610                cma_any_addr(&id_priv->id.route.addr.src_addr);
 611 }
 612
 613 static void cma_destroy_listen(struct rdma_id_private *id_priv)
 614 {
 615         cma_exch(id_priv, CMA_DESTROYING);
 616
 617         if (id_priv->cma_dev) {
 618                 switch (rdma_node_get_transport(id_priv->id.device->node_type)) {
 619                 case RDMA_TRANSPORT_IB:
 620                         if (id_priv->cm_id.ib && !IS_ERR(id_priv->cm_id.ib))
 621                                 ib_destroy_cm_id(id_priv->cm_id.ib);
 622                         break;
 623                 case RDMA_TRANSPORT_IWARP:
 624                         if (id_priv->cm_id.iw && !IS_ERR(id_priv->cm_id.iw))
 625                                 iw_destroy_cm_id(id_priv->cm_id.iw);
 626                         break;
 627                 default:
 628                         break;
 629                 }
 630                 cma_detach_from_dev(id_priv);
 631         }
 632         list_del(&id_priv->listen_list);
 633
 634         cma_deref_id(id_priv);
 635         wait_for_completion(&id_priv->comp);
 636
 637         kfree(id_priv);
 638 }
 639
 640 static void cma_cancel_listens(struct rdma_id_private *id_priv)
 641 {
 642         struct rdma_id_private *dev_id_priv;
 643
 644         mutex_lock(&lock);
 645         list_del(&id_priv->list);
 646
 647         while (!list_empty(&id_priv->listen_list)) {
 648                 dev_id_priv = list_entry(id_priv->listen_list.next,
 649                                          struct rdma_id_private, listen_list);
 650                 cma_destroy_listen(dev_id_priv);
 651         }
 652         mutex_unlock(&lock);
 653 }
 654
 655 static void cma_cancel_operation(struct rdma_id_private *id_priv,
 656                                  enum cma_state state)
 657 {
 658         switch (state) {
 659         case CMA_ADDR_QUERY:
 660                 rdma_addr_cancel(&id_priv->id.route.addr.dev_addr);
 661                 break;
 662         case CMA_ROUTE_QUERY:
 663                 cma_cancel_route(id_priv);
 664                 break;
 665         case CMA_LISTEN:
 666                 if (cma_any_addr(&id_priv->id.route.addr.src_addr) &&
 667                     !id_priv->cma_dev)
 668                         cma_cancel_listens(id_priv);
 669                 break;
 670         default:
 671                 break;
 672         }
 673 }
 674
 675 static void cma_release_port(struct rdma_id_private *id_priv)
 676 {
 677         struct rdma_bind_list *bind_list = id_priv->bind_list;
 678
 679         if (!bind_list)
 680                 return;
 681
 682         mutex_lock(&lock);
 683         hlist_del(&id_priv->node);
 684         if (hlist_empty(&bind_list->owners)) {
 685                 idr_remove(bind_list->ps, bind_list->port);
 686                 kfree(bind_list);
 687         }
 688         mutex_unlock(&lock);
 689 }
 690
 691 void rdma_destroy_id(struct rdma_cm_id *id)
 692 {
 693         struct rdma_id_private *id_priv;
 694         enum cma_state state;
 695
 696         id_priv = container_of(id, struct rdma_id_private, id);
 697         state = cma_exch(id_priv, CMA_DESTROYING);
 698         cma_cancel_operation(id_priv, state);
 699
 700         mutex_lock(&lock);
 701         if (id_priv->cma_dev) {
 702                 mutex_unlock(&lock);
 703                 switch (rdma_node_get_transport(id->device->node_type)) {
 704                 case RDMA_TRANSPORT_IB:
 705                         if (id_priv->cm_id.ib && !IS_ERR(id_priv->cm_id.ib))
 706                                 ib_destroy_cm_id(id_priv->cm_id.ib);
 707                         break;
 708                 case RDMA_TRANSPORT_IWARP:
 709                         if (id_priv->cm_id.iw && !IS_ERR(id_priv->cm_id.iw))
 710                                 iw_destroy_cm_id(id_priv->cm_id.iw);
 711                         break;
 712                 default:
 713                         break;
 714                 }
 715                 mutex_lock(&lock);
 716                 cma_detach_from_dev(id_priv);
 717         }
 718         mutex_unlock(&lock);
 719
 720         cma_release_port(id_priv);
 721         cma_deref_id(id_priv);
 722         wait_for_completion(&id_priv->comp);
 723
 724         kfree(id_priv->id.route.path_rec);
 725         kfree(id_priv);
 726 }
 727 EXPORT_SYMBOL(rdma_destroy_id);
 728
 729 static int cma_rep_recv(struct rdma_id_private *id_priv)
 730 {
 731         int ret;
 732
 733         ret = cma_modify_qp_rtr(&id_priv->id);
 734         if (ret)
 735                 goto reject;
 736
 737         ret = cma_modify_qp_rts(&id_priv->id);
 738         if (ret)
 739                 goto reject;
 740
 741         ret = ib_send_cm_rtu(id_priv->cm_id.ib, NULL, 0);
 742         if (ret)
 743                 goto reject;
 744
 745         return 0;
 746 reject:
 747         cma_modify_qp_err(&id_priv->id);
 748         ib_send_cm_rej(id_priv->cm_id.ib, IB_CM_REJ_CONSUMER_DEFINED,
 749                        NULL, 0, NULL, 0);
 750         return ret;
 751 }
 752
 753 static int cma_verify_rep(struct rdma_id_private *id_priv, void *data)
 754 {
 755         if (id_priv->id.ps == RDMA_PS_SDP &&
 756             sdp_get_majv(((struct sdp_hah *) data)->sdp_version) !=
 757             SDP_MAJ_VERSION)
 758                 return -EINVAL;
 759
 760         return 0;
 761 }
 762
 763 static int cma_rtu_recv(struct rdma_id_private *id_priv)
 764 {
 765         int ret;
 766
 767         ret = cma_modify_qp_rts(&id_priv->id);
 768         if (ret)
 769                 goto reject;
 770
 771         return 0;
 772 reject:
 773         cma_modify_qp_err(&id_priv->id);
 774         ib_send_cm_rej(id_priv->cm_id.ib, IB_CM_REJ_CONSUMER_DEFINED,
 775                        NULL, 0, NULL, 0);
 776         return ret;
 777 }
 778
 779 static void cma_set_rep_event_data(struct rdma_cm_event *event,
 780                                    struct ib_cm_rep_event_param *rep_data,
 781                                    void *private_data)
 782 {
 783         event->param.conn.private_data = private_data;
 784         event->param.conn.private_data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
 785         event->param.conn.responder_resources = rep_data->responder_resources;
 786         event->param.conn.initiator_depth = rep_data->initiator_depth;
 787         event->param.conn.flow_control = rep_data->flow_control;
 788         event->param.conn.rnr_retry_count = rep_data->rnr_retry_count;
 789         event->param.conn.srq = rep_data->srq;
 790         event->param.conn.qp_num = rep_data->remote_qpn;
 791 }
 792
 793 static int cma_ib_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
 794 {
 795         struct rdma_id_private *id_priv = cm_id->context;
 796         struct rdma_cm_event event;
 797         int ret = 0;
 798
 799         atomic_inc(&id_priv->dev_remove);
 800         if (!cma_comp(id_priv, CMA_CONNECT))
 801                 goto out;
 802
 803         memset(&event, 0, sizeof event);
 804         switch (ib_event->event) {
 805         case IB_CM_REQ_ERROR:
 806         case IB_CM_REP_ERROR:
 807                 event.event = RDMA_CM_EVENT_UNREACHABLE;
 808                 event.status = -ETIMEDOUT;
 809                 break;
 810         case IB_CM_REP_RECEIVED:
 811                 event.status = cma_verify_rep(id_priv, ib_event->private_data);
 812                 if (event.status)
 813                         event.event = RDMA_CM_EVENT_CONNECT_ERROR;
 814                 else if (id_priv->id.qp && id_priv->id.ps != RDMA_PS_SDP) {
 815                         event.status = cma_rep_recv(id_priv);
 816                         event.event = event.status ? RDMA_CM_EVENT_CONNECT_ERROR :
 817                                                      RDMA_CM_EVENT_ESTABLISHED;
 818                 } else
 819                         event.event = RDMA_CM_EVENT_CONNECT_RESPONSE;
 820                 cma_set_rep_event_data(&event, &ib_event->param.rep_rcvd,
 821                                        ib_event->private_data);
 822                 break;
 823         case IB_CM_RTU_RECEIVED:
 824                 event.status = cma_rtu_recv(id_priv);
 825                 event.event = event.status ? RDMA_CM_EVENT_CONNECT_ERROR :
 826                                              RDMA_CM_EVENT_ESTABLISHED;
 827                 break;
 828         case IB_CM_DREQ_ERROR:
 829                 event.status = -ETIMEDOUT; /* fall through */
 830         case IB_CM_DREQ_RECEIVED:
 831         case IB_CM_DREP_RECEIVED:
 832                 if (!cma_comp_exch(id_priv, CMA_CONNECT, CMA_DISCONNECT))
 833                         goto out;
 834                 event.event = RDMA_CM_EVENT_DISCONNECTED;
 835                 break;
 836         case IB_CM_TIMEWAIT_EXIT:
 837         case IB_CM_MRA_RECEIVED:
 838                 /* ignore event */
 839                 goto out;
 840         case IB_CM_REJ_RECEIVED:
 841                 cma_modify_qp_err(&id_priv->id);
 842                 event.status = ib_event->param.rej_rcvd.reason;
 843                 event.event = RDMA_CM_EVENT_REJECTED;
 844                 event.param.conn.private_data = ib_event->private_data;
 845                 event.param.conn.private_data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
 846                 break;
 847         default:
 848                 printk(KERN_ERR "RDMA CMA: unexpected IB CM event: %d",
 849                        ib_event->event);
 850                 goto out;
 851         }
 852
 853         ret = id_priv->id.event_handler(&id_priv->id, &event);
 854         if (ret) {
 855                 /* Destroy the CM ID by returning a non-zero value. */
 856                 id_priv->cm_id.ib = NULL;
 857                 cma_exch(id_priv, CMA_DESTROYING);
 858                 cma_release_remove(id_priv);
 859                 rdma_destroy_id(&id_priv->id);
 860                 return ret;
 861         }
 862 out:
 863         cma_release_remove(id_priv);
 864         return ret;
 865 }
 866
 867 static struct rdma_id_private *cma_new_id(struct rdma_cm_id *listen_id,
 868                                           struct ib_cm_event *ib_event)
 869 {
 870         struct rdma_id_private *id_priv;
 871         struct rdma_cm_id *id;
 872         struct rdma_route *rt;
 873         union cma_ip_addr *src, *dst;
 874         __u16 port;
 875         u8 ip_ver;
 876
 877         if (cma_get_net_info(ib_event->private_data, listen_id->ps,
 878                              &ip_ver, &port, &src, &dst))
 879                 goto err;
 880
 881         id = rdma_create_id(listen_id->event_handler, listen_id->context,
 882                             listen_id->ps);
 883         if (IS_ERR(id))
 884                 goto err;
 885
 886         cma_save_net_info(&id->route.addr, &listen_id->route.addr,
 887                           ip_ver, port, src, dst);
 888
 889         rt = &id->route;
 890         rt->num_paths = ib_event->param.req_rcvd.alternate_path ? 2 : 1;
 891         rt->path_rec = kmalloc(sizeof *rt->path_rec * rt->num_paths,
 892                                GFP_KERNEL);
 893         if (!rt->path_rec)
 894                 goto destroy_id;
 895
 896         rt->path_rec[0] = *ib_event->param.req_rcvd.primary_path;
 897         if (rt->num_paths == 2)
 898                 rt->path_rec[1] = *ib_event->param.req_rcvd.alternate_path;
 899
 900         ib_addr_set_sgid(&rt->addr.dev_addr, &rt->path_rec[0].sgid);
 901         ib_addr_set_dgid(&rt->addr.dev_addr, &rt->path_rec[0].dgid);
 902         ib_addr_set_pkey(&rt->addr.dev_addr, be16_to_cpu(rt->path_rec[0].pkey));
 903         rt->addr.dev_addr.dev_type = RDMA_NODE_IB_CA;
 904
 905         id_priv = container_of(id, struct rdma_id_private, id);
 906         id_priv->state = CMA_CONNECT;
 907         return id_priv;
 908
 909 destroy_id:
 910         rdma_destroy_id(id);
 911 err:
 912         return NULL;
 913 }
 914
 915 static void cma_set_req_event_data(struct rdma_cm_event *event,
 916                                    struct ib_cm_req_event_param *req_data,
 917                                    void *private_data, int offset)
 918 {
 919         event->param.conn.private_data = private_data + offset;
 920         event->param.conn.private_data_len = IB_CM_REQ_PRIVATE_DATA_SIZE - offset;
 921         event->param.conn.responder_resources = req_data->responder_resources;
 922         event->param.conn.initiator_depth = req_data->initiator_depth;
 923         event->param.conn.flow_control = req_data->flow_control;
 924         event->param.conn.retry_count = req_data->retry_count;
 925         event->param.conn.rnr_retry_count = req_data->rnr_retry_count;
 926         event->param.conn.srq = req_data->srq;
 927         event->param.conn.qp_num = req_data->remote_qpn;
 928 }
 929
 930 static int cma_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
 931 {
 932         struct rdma_id_private *listen_id, *conn_id;
 933         struct rdma_cm_event event;
 934         int offset, ret;
 935
 936         listen_id = cm_id->context;
 937         atomic_inc(&listen_id->dev_remove);
 938         if (!cma_comp(listen_id, CMA_LISTEN)) {
 939                 ret = -ECONNABORTED;
 940                 goto out;
 941         }
 942
 943         conn_id = cma_new_id(&listen_id->id, ib_event);
 944         if (!conn_id) {
 945                 ret = -ENOMEM;
 946                 goto out;
 947         }
 948
 949         atomic_inc(&conn_id->dev_remove);
 950         mutex_lock(&lock);
 951         ret = cma_acquire_dev(conn_id);
 952         mutex_unlock(&lock);
 953         if (ret)
 954                 goto release_conn_id;
 955
 956         conn_id->cm_id.ib = cm_id;
 957         cm_id->context = conn_id;
 958         cm_id->cm_handler = cma_ib_handler;
 959
 960         offset = cma_user_data_offset(listen_id->id.ps);
 961         memset(&event, 0, sizeof event);
 962         event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
 963         cma_set_req_event_data(&event, &ib_event->param.req_rcvd,
 964                                ib_event->private_data, offset);
 965         ret = conn_id->id.event_handler(&conn_id->id, &event);
 966         if (!ret)
 967                 goto out;
 968
 969         /* Destroy the CM ID by returning a non-zero value. */
 970         conn_id->cm_id.ib = NULL;
 971
 972 release_conn_id:
 973         cma_exch(conn_id, CMA_DESTROYING);
 974         cma_release_remove(conn_id);
 975         rdma_destroy_id(&conn_id->id);
 976
 977 out:
 978         cma_release_remove(listen_id);
 979         return ret;
 980 }
 981
 982 static __be64 cma_get_service_id(enum rdma_port_space ps, struct sockaddr *addr)
 983 {
 984         return cpu_to_be64(((u64)ps << 16) +
 985                be16_to_cpu(((struct sockaddr_in *) addr)->sin_port));
 986 }
 987
 988 static void cma_set_compare_data(enum rdma_port_space ps, struct sockaddr *addr,
 989                                  struct ib_cm_compare_data *compare)
 990 {
 991         struct cma_hdr *cma_data, *cma_mask;
 992         struct sdp_hh *sdp_data, *sdp_mask;
 993         __u32 ip4_addr;
 994         struct in6_addr ip6_addr;
 995
 996         memset(compare, 0, sizeof *compare);
 997         cma_data = (void *) compare->data;
 998         cma_mask = (void *) compare->mask;
 999         sdp_data = (void *) compare->data;
1000         sdp_mask = (void *) compare->mask;
1001
1002         switch (addr->sa_family) {
1003         case AF_INET:
1004                 ip4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
1005                 if (ps == RDMA_PS_SDP) {
1006                         sdp_set_ip_ver(sdp_data, 4);
1007                         sdp_set_ip_ver(sdp_mask, 0xF);
1008                         sdp_data->dst_addr.ip4.addr = ip4_addr;
1009                         sdp_mask->dst_addr.ip4.addr = ~0;
1010                 } else {
1011                         cma_set_ip_ver(cma_data, 4);
1012                         cma_set_ip_ver(cma_mask, 0xF);
1013                         cma_data->dst_addr.ip4.addr = ip4_addr;
1014                         cma_mask->dst_addr.ip4.addr = ~0;
1015                 }
1016                 break;
1017         case AF_INET6:
1018                 ip6_addr = ((struct sockaddr_in6 *) addr)->sin6_addr;
1019                 if (ps == RDMA_PS_SDP) {
1020                         sdp_set_ip_ver(sdp_data, 6);
1021                         sdp_set_ip_ver(sdp_mask, 0xF);
1022                         sdp_data->dst_addr.ip6 = ip6_addr;
1023                         memset(&sdp_mask->dst_addr.ip6, 0xFF,
1024                                sizeof sdp_mask->dst_addr.ip6);
1025                 } else {
1026                         cma_set_ip_ver(cma_data, 6);
1027                         cma_set_ip_ver(cma_mask, 0xF);
1028                         cma_data->dst_addr.ip6 = ip6_addr;
1029                         memset(&cma_mask->dst_addr.ip6, 0xFF,
1030                                sizeof cma_mask->dst_addr.ip6);
1031                 }
1032                 break;
1033         default:
1034                 break;
1035         }
1036 }
1037
1038 static int cma_iw_handler(struct iw_cm_id *iw_id, struct iw_cm_event *iw_event)
1039 {
1040         struct rdma_id_private *id_priv = iw_id->context;
1041         struct rdma_cm_event event;
1042         struct sockaddr_in *sin;
1043         int ret = 0;
1044
1045         memset(&event, 0, sizeof event);
1046         atomic_inc(&id_priv->dev_remove);
1047
1048         switch (iw_event->event) {
1049         case IW_CM_EVENT_CLOSE:
1050                 event.event = RDMA_CM_EVENT_DISCONNECTED;
1051                 break;
1052         case IW_CM_EVENT_CONNECT_REPLY:
1053                 sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1054                 *sin = iw_event->local_addr;
1055                 sin = (struct sockaddr_in *) &id_priv->id.route.addr.dst_addr;
1056                 *sin = iw_event->remote_addr;
1057                 if (iw_event->status)
1058                         event.event = RDMA_CM_EVENT_REJECTED;
1059                 else
1060                         event.event = RDMA_CM_EVENT_ESTABLISHED;
1061                 break;
1062         case IW_CM_EVENT_ESTABLISHED:
1063                 event.event = RDMA_CM_EVENT_ESTABLISHED;
1064                 break;
1065         default:
1066                 BUG_ON(1);
1067         }
1068
1069         event.status = iw_event->status;
1070         event.param.conn.private_data = iw_event->private_data;
1071         event.param.conn.private_data_len = iw_event->private_data_len;
1072         ret = id_priv->id.event_handler(&id_priv->id, &event);
1073         if (ret) {
1074                 /* Destroy the CM ID by returning a non-zero value. */
1075                 id_priv->cm_id.iw = NULL;
1076                 cma_exch(id_priv, CMA_DESTROYING);
1077                 cma_release_remove(id_priv);
1078                 rdma_destroy_id(&id_priv->id);
1079                 return ret;
1080         }
1081
1082         cma_release_remove(id_priv);
1083         return ret;
1084 }
1085
1086 static int iw_conn_req_handler(struct iw_cm_id *cm_id,
1087                                struct iw_cm_event *iw_event)
1088 {
1089         struct rdma_cm_id *new_cm_id;
1090         struct rdma_id_private *listen_id, *conn_id;
1091         struct sockaddr_in *sin;
1092         struct net_device *dev = NULL;
1093         struct rdma_cm_event event;
1094         int ret;
1095
1096         listen_id = cm_id->context;
1097         atomic_inc(&listen_id->dev_remove);
1098         if (!cma_comp(listen_id, CMA_LISTEN)) {
1099                 ret = -ECONNABORTED;
1100                 goto out;
1101         }
1102
1103         /* Create a new RDMA id for the new IW CM ID */
1104         new_cm_id = rdma_create_id(listen_id->id.event_handler,
1105                                    listen_id->id.context,
1106                                    RDMA_PS_TCP);
1107         if (!new_cm_id) {
1108                 ret = -ENOMEM;
1109                 goto out;
1110         }
1111         conn_id = container_of(new_cm_id, struct rdma_id_private, id);
1112         atomic_inc(&conn_id->dev_remove);
1113         conn_id->state = CMA_CONNECT;
1114
1115         dev = ip_dev_find(iw_event->local_addr.sin_addr.s_addr);
1116         if (!dev) {
1117                 ret = -EADDRNOTAVAIL;
1118                 cma_release_remove(conn_id);
1119                 rdma_destroy_id(new_cm_id);
1120                 goto out;
1121         }
1122         ret = rdma_copy_addr(&conn_id->id.route.addr.dev_addr, dev, NULL);
1123         if (ret) {
1124                 cma_release_remove(conn_id);
1125                 rdma_destroy_id(new_cm_id);
1126                 goto out;
1127         }
1128
1129         mutex_lock(&lock);
1130         ret = cma_acquire_dev(conn_id);
1131         mutex_unlock(&lock);
1132         if (ret) {
1133                 cma_release_remove(conn_id);
1134                 rdma_destroy_id(new_cm_id);
1135                 goto out;
1136         }
1137
1138         conn_id->cm_id.iw = cm_id;
1139         cm_id->context = conn_id;
1140         cm_id->cm_handler = cma_iw_handler;
1141
1142         sin = (struct sockaddr_in *) &new_cm_id->route.addr.src_addr;
1143         *sin = iw_event->local_addr;
1144         sin = (struct sockaddr_in *) &new_cm_id->route.addr.dst_addr;
1145         *sin = iw_event->remote_addr;
1146
1147         memset(&event, 0, sizeof event);
1148         event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
1149         event.param.conn.private_data = iw_event->private_data;
1150         event.param.conn.private_data_len = iw_event->private_data_len;
1151         ret = conn_id->id.event_handler(&conn_id->id, &event);
1152         if (ret) {
1153                 /* User wants to destroy the CM ID */
1154                 conn_id->cm_id.iw = NULL;
1155                 cma_exch(conn_id, CMA_DESTROYING);
1156                 cma_release_remove(conn_id);
1157                 rdma_destroy_id(&conn_id->id);
1158         }
1159
1160 out:
1161         if (dev)
1162                 dev_put(dev);
1163         cma_release_remove(listen_id);
1164         return ret;
1165 }
1166
1167 static int cma_ib_listen(struct rdma_id_private *id_priv)
1168 {
1169         struct ib_cm_compare_data compare_data;
1170         struct sockaddr *addr;
1171         __be64 svc_id;
1172         int ret;
1173
1174         id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device, cma_req_handler,
1175                                             id_priv);
1176         if (IS_ERR(id_priv->cm_id.ib))
1177                 return PTR_ERR(id_priv->cm_id.ib);
1178
1179         addr = &id_priv->id.route.addr.src_addr;
1180         svc_id = cma_get_service_id(id_priv->id.ps, addr);
1181         if (cma_any_addr(addr))
1182                 ret = ib_cm_listen(id_priv->cm_id.ib, svc_id, 0, NULL);
1183         else {
1184                 cma_set_compare_data(id_priv->id.ps, addr, &compare_data);
1185                 ret = ib_cm_listen(id_priv->cm_id.ib, svc_id, 0, &compare_data);
1186         }
1187
1188         if (ret) {
1189                 ib_destroy_cm_id(id_priv->cm_id.ib);
1190                 id_priv->cm_id.ib = NULL;
1191         }
1192
1193         return ret;
1194 }
1195
1196 static int cma_iw_listen(struct rdma_id_private *id_priv, int backlog)
1197 {
1198         int ret;
1199         struct sockaddr_in *sin;
1200
1201         id_priv->cm_id.iw = iw_create_cm_id(id_priv->id.device,
1202                                             iw_conn_req_handler,
1203                                             id_priv);
1204         if (IS_ERR(id_priv->cm_id.iw))
1205                 return PTR_ERR(id_priv->cm_id.iw);
1206
1207         sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1208         id_priv->cm_id.iw->local_addr = *sin;
1209
1210         ret = iw_cm_listen(id_priv->cm_id.iw, backlog);
1211
1212         if (ret) {
1213                 iw_destroy_cm_id(id_priv->cm_id.iw);
1214                 id_priv->cm_id.iw = NULL;
1215         }
1216
1217         return ret;
1218 }
1219
1220 static int cma_listen_handler(struct rdma_cm_id *id,
1221                               struct rdma_cm_event *event)
1222 {
1223         struct rdma_id_private *id_priv = id->context;
1224
1225         id->context = id_priv->id.context;
1226         id->event_handler = id_priv->id.event_handler;
1227         return id_priv->id.event_handler(id, event);
1228 }
1229
1230 static void cma_listen_on_dev(struct rdma_id_private *id_priv,
1231                               struct cma_device *cma_dev)
1232 {
1233         struct rdma_id_private *dev_id_priv;
1234         struct rdma_cm_id *id;
1235         int ret;
1236
1237         id = rdma_create_id(cma_listen_handler, id_priv, id_priv->id.ps);
1238         if (IS_ERR(id))
1239                 return;
1240
1241         dev_id_priv = container_of(id, struct rdma_id_private, id);
1242
1243         dev_id_priv->state = CMA_ADDR_BOUND;
1244         memcpy(&id->route.addr.src_addr, &id_priv->id.route.addr.src_addr,
1245                ip_addr_size(&id_priv->id.route.addr.src_addr));
1246
1247         cma_attach_to_dev(dev_id_priv, cma_dev);
1248         list_add_tail(&dev_id_priv->listen_list, &id_priv->listen_list);
1249
1250         ret = rdma_listen(id, id_priv->backlog);
1251         if (ret)
1252                 goto err;
1253
1254         return;
1255 err:
1256         cma_destroy_listen(dev_id_priv);
1257 }
1258
1259 static void cma_listen_on_all(struct rdma_id_private *id_priv)
1260 {
1261         struct cma_device *cma_dev;
1262
1263         mutex_lock(&lock);
1264         list_add_tail(&id_priv->list, &listen_any_list);
1265         list_for_each_entry(cma_dev, &dev_list, list)
1266                 cma_listen_on_dev(id_priv, cma_dev);
1267         mutex_unlock(&lock);
1268 }
1269
1270 static int cma_bind_any(struct rdma_cm_id *id, sa_family_t af)
1271 {
1272         struct sockaddr_in addr_in;
1273
1274         memset(&addr_in, 0, sizeof addr_in);
1275         addr_in.sin_family = af;
1276         return rdma_bind_addr(id, (struct sockaddr *) &addr_in);
1277 }
1278
1279 int rdma_listen(struct rdma_cm_id *id, int backlog)
1280 {
1281         struct rdma_id_private *id_priv;
1282         int ret;
1283
1284         id_priv = container_of(id, struct rdma_id_private, id);
1285         if (id_priv->state == CMA_IDLE) {
1286                 ret = cma_bind_any(id, AF_INET);
1287                 if (ret)
1288                         return ret;
1289         }
1290
1291         if (!cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_LISTEN))
1292                 return -EINVAL;
1293
1294         id_priv->backlog = backlog;
1295         if (id->device) {
1296                 switch (rdma_node_get_transport(id->device->node_type)) {
1297                 case RDMA_TRANSPORT_IB:
1298                         ret = cma_ib_listen(id_priv);
1299                         if (ret)
1300                                 goto err;
1301                         break;
1302                 case RDMA_TRANSPORT_IWARP:
1303                         ret = cma_iw_listen(id_priv, backlog);
1304                         if (ret)
1305                                 goto err;
1306                         break;
1307                 default:
1308                         ret = -ENOSYS;
1309                         goto err;
1310                 }
1311         } else
1312                 cma_listen_on_all(id_priv);
1313
1314         return 0;
1315 err:
1316         id_priv->backlog = 0;
1317         cma_comp_exch(id_priv, CMA_LISTEN, CMA_ADDR_BOUND);
1318         return ret;
1319 }
1320 EXPORT_SYMBOL(rdma_listen);
1321
1322 static void cma_query_handler(int status, struct ib_sa_path_rec *path_rec,
1323                               void *context)
1324 {
1325         struct cma_work *work = context;
1326         struct rdma_route *route;
1327
1328         route = &work->id->id.route;
1329
1330         if (!status) {
1331                 route->num_paths = 1;
1332                 *route->path_rec = *path_rec;
1333         } else {
1334                 work->old_state = CMA_ROUTE_QUERY;
1335                 work->new_state = CMA_ADDR_RESOLVED;
1336                 work->event.event = RDMA_CM_EVENT_ROUTE_ERROR;
1337                 work->event.status = status;
1338         }
1339
1340         queue_work(cma_wq, &work->work);
1341 }
1342
1343 static int cma_query_ib_route(struct rdma_id_private *id_priv, int timeout_ms,
1344                               struct cma_work *work)
1345 {
1346         struct rdma_dev_addr *addr = &id_priv->id.route.addr.dev_addr;
1347         struct ib_sa_path_rec path_rec;
1348
1349         memset(&path_rec, 0, sizeof path_rec);
1350         ib_addr_get_sgid(addr, &path_rec.sgid);
1351         ib_addr_get_dgid(addr, &path_rec.dgid);
1352         path_rec.pkey = cpu_to_be16(ib_addr_get_pkey(addr));
1353         path_rec.numb_path = 1;
1354
1355         id_priv->query_id = ib_sa_path_rec_get(&sa_client, id_priv->id.device,
1356                                 id_priv->id.port_num, &path_rec,
1357                                 IB_SA_PATH_REC_DGID | IB_SA_PATH_REC_SGID |
1358                                 IB_SA_PATH_REC_PKEY | IB_SA_PATH_REC_NUMB_PATH,
1359                                 timeout_ms, GFP_KERNEL,
1360                                 cma_query_handler, work, &id_priv->query);
1361
1362         return (id_priv->query_id < 0) ? id_priv->query_id : 0;
1363 }
1364
1365 static void cma_work_handler(struct work_struct *_work)
1366 {
1367         struct cma_work *work = container_of(_work, struct cma_work, work);
1368         struct rdma_id_private *id_priv = work->id;
1369         int destroy = 0;
1370
1371         atomic_inc(&id_priv->dev_remove);
1372         if (!cma_comp_exch(id_priv, work->old_state, work->new_state))
1373                 goto out;
1374
1375         if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
1376                 cma_exch(id_priv, CMA_DESTROYING);
1377                 destroy = 1;
1378         }
1379 out:
1380         cma_release_remove(id_priv);
1381         cma_deref_id(id_priv);
1382         if (destroy)
1383                 rdma_destroy_id(&id_priv->id);
1384         kfree(work);
1385 }
1386
1387 static int cma_resolve_ib_route(struct rdma_id_private *id_priv, int timeout_ms)
1388 {
1389         struct rdma_route *route = &id_priv->id.route;
1390         struct cma_work *work;
1391         int ret;
1392
1393         work = kzalloc(sizeof *work, GFP_KERNEL);
1394         if (!work)
1395                 return -ENOMEM;
1396
1397         work->id = id_priv;
1398         INIT_WORK(&work->work, cma_work_handler);
1399         work->old_state = CMA_ROUTE_QUERY;
1400         work->new_state = CMA_ROUTE_RESOLVED;
1401         work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
1402
1403         route->path_rec = kmalloc(sizeof *route->path_rec, GFP_KERNEL);
1404         if (!route->path_rec) {
1405                 ret = -ENOMEM;
1406                 goto err1;
1407         }
1408
1409         ret = cma_query_ib_route(id_priv, timeout_ms, work);
1410         if (ret)
1411                 goto err2;
1412
1413         return 0;
1414 err2:
1415         kfree(route->path_rec);
1416         route->path_rec = NULL;
1417 err1:
1418         kfree(work);
1419         return ret;
1420 }
1421
1422 int rdma_set_ib_paths(struct rdma_cm_id *id,
1423                       struct ib_sa_path_rec *path_rec, int num_paths)
1424 {
1425         struct rdma_id_private *id_priv;
1426         int ret;
1427
1428         id_priv = container_of(id, struct rdma_id_private, id);
1429         if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ROUTE_RESOLVED))
1430                 return -EINVAL;
1431
1432         id->route.path_rec = kmalloc(sizeof *path_rec * num_paths, GFP_KERNEL);
1433         if (!id->route.path_rec) {
1434                 ret = -ENOMEM;
1435                 goto err;
1436         }
1437
1438         memcpy(id->route.path_rec, path_rec, sizeof *path_rec * num_paths);
1439         return 0;
1440 err:
1441         cma_comp_exch(id_priv, CMA_ROUTE_RESOLVED, CMA_ADDR_RESOLVED);
1442         return ret;
1443 }
1444 EXPORT_SYMBOL(rdma_set_ib_paths);
1445
1446 static int cma_resolve_iw_route(struct rdma_id_private *id_priv, int timeout_ms)
1447 {
1448         struct cma_work *work;
1449
1450         work = kzalloc(sizeof *work, GFP_KERNEL);
1451         if (!work)
1452                 return -ENOMEM;
1453
1454         work->id = id_priv;
1455         INIT_WORK(&work->work, cma_work_handler);
1456         work->old_state = CMA_ROUTE_QUERY;
1457         work->new_state = CMA_ROUTE_RESOLVED;
1458         work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
1459         queue_work(cma_wq, &work->work);
1460         return 0;
1461 }
1462
1463 int rdma_resolve_route(struct rdma_cm_id *id, int timeout_ms)
1464 {
1465         struct rdma_id_private *id_priv;
1466         int ret;
1467
1468         id_priv = container_of(id, struct rdma_id_private, id);
1469         if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ROUTE_QUERY))
1470                 return -EINVAL;
1471
1472         atomic_inc(&id_priv->refcount);
1473         switch (rdma_node_get_transport(id->device->node_type)) {
1474         case RDMA_TRANSPORT_IB:
1475                 ret = cma_resolve_ib_route(id_priv, timeout_ms);
1476                 break;
1477         case RDMA_TRANSPORT_IWARP:
1478                 ret = cma_resolve_iw_route(id_priv, timeout_ms);
1479                 break;
1480         default:
1481                 ret = -ENOSYS;
1482                 break;
1483         }
1484         if (ret)
1485                 goto err;
1486
1487         return 0;
1488 err:
1489         cma_comp_exch(id_priv, CMA_ROUTE_QUERY, CMA_ADDR_RESOLVED);
1490         cma_deref_id(id_priv);
1491         return ret;
1492 }
1493 EXPORT_SYMBOL(rdma_resolve_route);
1494
1495 static int cma_bind_loopback(struct rdma_id_private *id_priv)
1496 {
1497         struct cma_device *cma_dev;
1498         struct ib_port_attr port_attr;
1499         union ib_gid gid;
1500         u16 pkey;
1501         int ret;
1502         u8 p;
1503
1504         mutex_lock(&lock);
1505         if (list_empty(&dev_list)) {
1506                 ret = -ENODEV;
1507                 goto out;
1508         }
1509         list_for_each_entry(cma_dev, &dev_list, list)
1510                 for (p = 1; p <= cma_dev->device->phys_port_cnt; ++p)
1511                         if (!ib_query_port(cma_dev->device, p, &port_attr) &&
1512                             port_attr.state == IB_PORT_ACTIVE)
1513                                 goto port_found;
1514
1515         p = 1;
1516         cma_dev = list_entry(dev_list.next, struct cma_device, list);
1517
1518 port_found:
1519         ret = ib_get_cached_gid(cma_dev->device, p, 0, &gid);
1520         if (ret)
1521                 goto out;
1522
1523         ret = ib_get_cached_pkey(cma_dev->device, p, 0, &pkey);
1524         if (ret)
1525                 goto out;
1526
1527         ib_addr_set_sgid(&id_priv->id.route.addr.dev_addr, &gid);
1528         ib_addr_set_pkey(&id_priv->id.route.addr.dev_addr, pkey);
1529         id_priv->id.port_num = p;
1530         cma_attach_to_dev(id_priv, cma_dev);
1531 out:
1532         mutex_unlock(&lock);
1533         return ret;
1534 }
1535
1536 static void addr_handler(int status, struct sockaddr *src_addr,
1537                          struct rdma_dev_addr *dev_addr, void *context)
1538 {
1539         struct rdma_id_private *id_priv = context;
1540         struct rdma_cm_event event;
1541
1542         memset(&event, 0, sizeof event);
1543         atomic_inc(&id_priv->dev_remove);
1544
1545         /*
1546          * Grab mutex to block rdma_destroy_id() from removing the device while
1547          * we're trying to acquire it.
1548          */
1549         mutex_lock(&lock);
1550         if (!cma_comp_exch(id_priv, CMA_ADDR_QUERY, CMA_ADDR_RESOLVED)) {
1551                 mutex_unlock(&lock);
1552                 goto out;
1553         }
1554
1555         if (!status && !id_priv->cma_dev)
1556                 status = cma_acquire_dev(id_priv);
1557         mutex_unlock(&lock);
1558
1559         if (status) {
1560                 if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ADDR_BOUND))
1561                         goto out;
1562                 event.event = RDMA_CM_EVENT_ADDR_ERROR;
1563                 event.status = status;
1564         } else {
1565                 memcpy(&id_priv->id.route.addr.src_addr, src_addr,
1566                        ip_addr_size(src_addr));
1567                 event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
1568         }
1569
1570         if (id_priv->id.event_handler(&id_priv->id, &event)) {
1571                 cma_exch(id_priv, CMA_DESTROYING);
1572                 cma_release_remove(id_priv);
1573                 cma_deref_id(id_priv);
1574                 rdma_destroy_id(&id_priv->id);
1575                 return;
1576         }
1577 out:
1578         cma_release_remove(id_priv);
1579         cma_deref_id(id_priv);
1580 }
1581
1582 static int cma_resolve_loopback(struct rdma_id_private *id_priv)
1583 {
1584         struct cma_work *work;
1585         struct sockaddr_in *src_in, *dst_in;
1586         union ib_gid gid;
1587         int ret;
1588
1589         work = kzalloc(sizeof *work, GFP_KERNEL);
1590         if (!work)
1591                 return -ENOMEM;
1592
1593         if (!id_priv->cma_dev) {
1594                 ret = cma_bind_loopback(id_priv);
1595                 if (ret)
1596                         goto err;
1597         }
1598
1599         ib_addr_get_sgid(&id_priv->id.route.addr.dev_addr, &gid);
1600         ib_addr_set_dgid(&id_priv->id.route.addr.dev_addr, &gid);
1601
1602         if (cma_zero_addr(&id_priv->id.route.addr.src_addr)) {
1603                 src_in = (struct sockaddr_in *)&id_priv->id.route.addr.src_addr;
1604                 dst_in = (struct sockaddr_in *)&id_priv->id.route.addr.dst_addr;
1605                 src_in->sin_family = dst_in->sin_family;
1606                 src_in->sin_addr.s_addr = dst_in->sin_addr.s_addr;
1607         }
1608
1609         work->id = id_priv;
1610         INIT_WORK(&work->work, cma_work_handler);
1611         work->old_state = CMA_ADDR_QUERY;
1612         work->new_state = CMA_ADDR_RESOLVED;
1613         work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
1614         queue_work(cma_wq, &work->work);
1615         return 0;
1616 err:
1617         kfree(work);
1618         return ret;
1619 }
1620
1621 static int cma_bind_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
1622                          struct sockaddr *dst_addr)
1623 {
1624         if (src_addr && src_addr->sa_family)
1625                 return rdma_bind_addr(id, src_addr);
1626         else
1627                 return cma_bind_any(id, dst_addr->sa_family);
1628 }
1629
1630 int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
1631                       struct sockaddr *dst_addr, int timeout_ms)
1632 {
1633         struct rdma_id_private *id_priv;
1634         int ret;
1635
1636         id_priv = container_of(id, struct rdma_id_private, id);
1637         if (id_priv->state == CMA_IDLE) {
1638                 ret = cma_bind_addr(id, src_addr, dst_addr);
1639                 if (ret)
1640                         return ret;
1641         }
1642
1643         if (!cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_ADDR_QUERY))
1644                 return -EINVAL;
1645
1646         atomic_inc(&id_priv->refcount);
1647         memcpy(&id->route.addr.dst_addr, dst_addr, ip_addr_size(dst_addr));
1648         if (cma_any_addr(dst_addr))
1649                 ret = cma_resolve_loopback(id_priv);
1650         else
1651                 ret = rdma_resolve_ip(&addr_client, &id->route.addr.src_addr,
1652                                       dst_addr, &id->route.addr.dev_addr,
1653                                       timeout_ms, addr_handler, id_priv);
1654         if (ret)
1655                 goto err;
1656
1657         return 0;
1658 err:
1659         cma_comp_exch(id_priv, CMA_ADDR_QUERY, CMA_ADDR_BOUND);
1660         cma_deref_id(id_priv);
1661         return ret;
1662 }
1663 EXPORT_SYMBOL(rdma_resolve_addr);
1664
1665 static void cma_bind_port(struct rdma_bind_list *bind_list,
1666                           struct rdma_id_private *id_priv)
1667 {
1668         struct sockaddr_in *sin;
1669
1670         sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1671         sin->sin_port = htons(bind_list->port);
1672         id_priv->bind_list = bind_list;
1673         hlist_add_head(&id_priv->node, &bind_list->owners);
1674 }
1675
1676 static int cma_alloc_port(struct idr *ps, struct rdma_id_private *id_priv,
1677                           unsigned short snum)
1678 {
1679         struct rdma_bind_list *bind_list;
1680         int port, start, ret;
1681
1682         bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL);
1683         if (!bind_list)
1684                 return -ENOMEM;
1685
1686         start = snum ? snum : sysctl_local_port_range[0];
1687
1688         do {
1689                 ret = idr_get_new_above(ps, bind_list, start, &port);
1690         } while ((ret == -EAGAIN) && idr_pre_get(ps, GFP_KERNEL));
1691
1692         if (ret)
1693                 goto err;
1694
1695         if ((snum && port != snum) ||
1696             (!snum && port > sysctl_local_port_range[1])) {
1697                 idr_remove(ps, port);
1698                 ret = -EADDRNOTAVAIL;
1699                 goto err;
1700         }
1701
1702         bind_list->ps = ps;
1703         bind_list->port = (unsigned short) port;
1704         cma_bind_port(bind_list, id_priv);
1705         return 0;
1706 err:
1707         kfree(bind_list);
1708         return ret;
1709 }
1710
1711 static int cma_use_port(struct idr *ps, struct rdma_id_private *id_priv)
1712 {
1713         struct rdma_id_private *cur_id;
1714         struct sockaddr_in *sin, *cur_sin;
1715         struct rdma_bind_list *bind_list;
1716         struct hlist_node *node;
1717         unsigned short snum;
1718
1719         sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1720         snum = ntohs(sin->sin_port);
1721         if (snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
1722                 return -EACCES;
1723
1724         bind_list = idr_find(ps, snum);
1725         if (!bind_list)
1726                 return cma_alloc_port(ps, id_priv, snum);
1727
1728         /*
1729          * We don't support binding to any address if anyone is bound to
1730          * a specific address on the same port.
1731          */
1732         if (cma_any_addr(&id_priv->id.route.addr.src_addr))
1733                 return -EADDRNOTAVAIL;
1734
1735         hlist_for_each_entry(cur_id, node, &bind_list->owners, node) {
1736                 if (cma_any_addr(&cur_id->id.route.addr.src_addr))
1737                         return -EADDRNOTAVAIL;
1738
1739                 cur_sin = (struct sockaddr_in *) &cur_id->id.route.addr.src_addr;
1740                 if (sin->sin_addr.s_addr == cur_sin->sin_addr.s_addr)
1741                         return -EADDRINUSE;
1742         }
1743
1744         cma_bind_port(bind_list, id_priv);
1745         return 0;
1746 }
1747
1748 static int cma_get_port(struct rdma_id_private *id_priv)
1749 {
1750         struct idr *ps;
1751         int ret;
1752
1753         switch (id_priv->id.ps) {
1754         case RDMA_PS_SDP:
1755                 ps = &sdp_ps;
1756                 break;
1757         case RDMA_PS_TCP:
1758                 ps = &tcp_ps;
1759                 break;
1760         default:
1761                 return -EPROTONOSUPPORT;
1762         }
1763
1764         mutex_lock(&lock);
1765         if (cma_any_port(&id_priv->id.route.addr.src_addr))
1766                 ret = cma_alloc_port(ps, id_priv, 0);
1767         else
1768                 ret = cma_use_port(ps, id_priv);
1769         mutex_unlock(&lock);
1770
1771         return ret;
1772 }
1773
1774 int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr)
1775 {
1776         struct rdma_id_private *id_priv;
1777         int ret;
1778
1779         if (addr->sa_family != AF_INET)
1780                 return -EAFNOSUPPORT;
1781
1782         id_priv = container_of(id, struct rdma_id_private, id);
1783         if (!cma_comp_exch(id_priv, CMA_IDLE, CMA_ADDR_BOUND))
1784                 return -EINVAL;
1785
1786         if (!cma_any_addr(addr)) {
1787                 ret = rdma_translate_ip(addr, &id->route.addr.dev_addr);
1788                 if (ret)
1789                         goto err1;
1790
1791                 mutex_lock(&lock);
1792                 ret = cma_acquire_dev(id_priv);
1793                 mutex_unlock(&lock);
1794                 if (ret)
1795                         goto err1;
1796         }
1797
1798         memcpy(&id->route.addr.src_addr, addr, ip_addr_size(addr));
1799         ret = cma_get_port(id_priv);
1800         if (ret)
1801                 goto err2;
1802
1803         return 0;
1804 err2:
1805         if (!cma_any_addr(addr)) {
1806                 mutex_lock(&lock);
1807                 cma_detach_from_dev(id_priv);
1808                 mutex_unlock(&lock);
1809         }
1810 err1:
1811         cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_IDLE);
1812         return ret;
1813 }
1814 EXPORT_SYMBOL(rdma_bind_addr);
1815
1816 static int cma_format_hdr(void *hdr, enum rdma_port_space ps,
1817                           struct rdma_route *route)
1818 {
1819         struct sockaddr_in *src4, *dst4;
1820         struct cma_hdr *cma_hdr;
1821         struct sdp_hh *sdp_hdr;
1822
1823         src4 = (struct sockaddr_in *) &route->addr.src_addr;
1824         dst4 = (struct sockaddr_in *) &route->addr.dst_addr;
1825
1826         switch (ps) {
1827         case RDMA_PS_SDP:
1828                 sdp_hdr = hdr;
1829                 if (sdp_get_majv(sdp_hdr->sdp_version) != SDP_MAJ_VERSION)
1830                         return -EINVAL;
1831                 sdp_set_ip_ver(sdp_hdr, 4);
1832                 sdp_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
1833                 sdp_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
1834                 sdp_hdr->port = src4->sin_port;
1835                 break;
1836         default:
1837                 cma_hdr = hdr;
1838                 cma_hdr->cma_version = CMA_VERSION;
1839                 cma_set_ip_ver(cma_hdr, 4);
1840                 cma_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
1841                 cma_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
1842                 cma_hdr->port = src4->sin_port;
1843                 break;
1844         }
1845         return 0;
1846 }
1847
1848 static int cma_connect_ib(struct rdma_id_private *id_priv,
1849                           struct rdma_conn_param *conn_param)
1850 {
1851         struct ib_cm_req_param req;
1852         struct rdma_route *route;
1853         void *private_data;
1854         int offset, ret;
1855
1856         memset(&req, 0, sizeof req);
1857         offset = cma_user_data_offset(id_priv->id.ps);
1858         req.private_data_len = offset + conn_param->private_data_len;
1859         private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
1860         if (!private_data)
1861                 return -ENOMEM;
1862
1863         if (conn_param->private_data && conn_param->private_data_len)
1864                 memcpy(private_data + offset, conn_param->private_data,
1865                        conn_param->private_data_len);
1866
1867         id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device, cma_ib_handler,
1868                                             id_priv);
1869         if (IS_ERR(id_priv->cm_id.ib)) {
1870                 ret = PTR_ERR(id_priv->cm_id.ib);
1871                 goto out;
1872         }
1873
1874         route = &id_priv->id.route;
1875         ret = cma_format_hdr(private_data, id_priv->id.ps, route);
1876         if (ret)
1877                 goto out;
1878         req.private_data = private_data;
1879
1880         req.primary_path = &route->path_rec[0];
1881         if (route->num_paths == 2)
1882                 req.alternate_path = &route->path_rec[1];
1883
1884         req.service_id = cma_get_service_id(id_priv->id.ps,
1885                                             &route->addr.dst_addr);
1886         req.qp_num = id_priv->qp_num;
1887         req.qp_type = IB_QPT_RC;
1888         req.starting_psn = id_priv->seq_num;
1889         req.responder_resources = conn_param->responder_resources;
1890         req.initiator_depth = conn_param->initiator_depth;
1891         req.flow_control = conn_param->flow_control;
1892         req.retry_count = conn_param->retry_count;
1893         req.rnr_retry_count = conn_param->rnr_retry_count;
1894         req.remote_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
1895         req.local_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
1896         req.max_cm_retries = CMA_MAX_CM_RETRIES;
1897         req.srq = id_priv->srq ? 1 : 0;
1898
1899         ret = ib_send_cm_req(id_priv->cm_id.ib, &req);
1900 out:
1901         if (ret && !IS_ERR(id_priv->cm_id.ib)) {
1902                 ib_destroy_cm_id(id_priv->cm_id.ib);
1903                 id_priv->cm_id.ib = NULL;
1904         }
1905
1906         kfree(private_data);
1907         return ret;
1908 }
1909
1910 static int cma_connect_iw(struct rdma_id_private *id_priv,
1911                           struct rdma_conn_param *conn_param)
1912 {
1913         struct iw_cm_id *cm_id;
1914         struct sockaddr_in* sin;
1915         int ret;
1916         struct iw_cm_conn_param iw_param;
1917
1918         cm_id = iw_create_cm_id(id_priv->id.device, cma_iw_handler, id_priv);
1919         if (IS_ERR(cm_id)) {
1920                 ret = PTR_ERR(cm_id);
1921                 goto out;
1922         }
1923
1924         id_priv->cm_id.iw = cm_id;
1925
1926         sin = (struct sockaddr_in*) &id_priv->id.route.addr.src_addr;
1927         cm_id->local_addr = *sin;
1928
1929         sin = (struct sockaddr_in*) &id_priv->id.route.addr.dst_addr;
1930         cm_id->remote_addr = *sin;
1931
1932         ret = cma_modify_qp_rtr(&id_priv->id);
1933         if (ret)
1934                 goto out;
1935
1936         iw_param.ord = conn_param->initiator_depth;
1937         iw_param.ird = conn_param->responder_resources;
1938         iw_param.private_data = conn_param->private_data;
1939         iw_param.private_data_len = conn_param->private_data_len;
1940         if (id_priv->id.qp)
1941                 iw_param.qpn = id_priv->qp_num;
1942         else
1943                 iw_param.qpn = conn_param->qp_num;
1944         ret = iw_cm_connect(cm_id, &iw_param);
1945 out:
1946         if (ret && !IS_ERR(cm_id)) {
1947                 iw_destroy_cm_id(cm_id);
1948                 id_priv->cm_id.iw = NULL;
1949         }
1950         return ret;
1951 }
1952
1953 int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
1954 {
1955         struct rdma_id_private *id_priv;
1956         int ret;
1957
1958         id_priv = container_of(id, struct rdma_id_private, id);
1959         if (!cma_comp_exch(id_priv, CMA_ROUTE_RESOLVED, CMA_CONNECT))
1960                 return -EINVAL;
1961
1962         if (!id->qp) {
1963                 id_priv->qp_num = conn_param->qp_num;
1964                 id_priv->srq = conn_param->srq;
1965         }
1966
1967         switch (rdma_node_get_transport(id->device->node_type)) {
1968         case RDMA_TRANSPORT_IB:
1969                 ret = cma_connect_ib(id_priv, conn_param);
1970                 break;
1971         case RDMA_TRANSPORT_IWARP:
1972                 ret = cma_connect_iw(id_priv, conn_param);
1973                 break;
1974         default:
1975                 ret = -ENOSYS;
1976                 break;
1977         }
1978         if (ret)
1979                 goto err;
1980
1981         return 0;
1982 err:
1983         cma_comp_exch(id_priv, CMA_CONNECT, CMA_ROUTE_RESOLVED);
1984         return ret;
1985 }
1986 EXPORT_SYMBOL(rdma_connect);
1987
1988 static int cma_accept_ib(struct rdma_id_private *id_priv,
1989                          struct rdma_conn_param *conn_param)
1990 {
1991         struct ib_cm_rep_param rep;
1992         int ret;
1993
1994         ret = cma_modify_qp_rtr(&id_priv->id);
1995         if (ret)
1996                 return ret;
1997
1998         memset(&rep, 0, sizeof rep);
1999         rep.qp_num = id_priv->qp_num;
2000         rep.starting_psn = id_priv->seq_num;
2001         rep.private_data = conn_param->private_data;
2002         rep.private_data_len = conn_param->private_data_len;
2003         rep.responder_resources = conn_param->responder_resources;
2004         rep.initiator_depth = conn_param->initiator_depth;
2005         rep.target_ack_delay = CMA_CM_RESPONSE_TIMEOUT;
2006         rep.failover_accepted = 0;
2007         rep.flow_control = conn_param->flow_control;
2008         rep.rnr_retry_count = conn_param->rnr_retry_count;
2009         rep.srq = id_priv->srq ? 1 : 0;
2010
2011         return ib_send_cm_rep(id_priv->cm_id.ib, &rep);
2012 }
2013
2014 static int cma_accept_iw(struct rdma_id_private *id_priv,
2015                   struct rdma_conn_param *conn_param)
2016 {
2017         struct iw_cm_conn_param iw_param;
2018         int ret;
2019
2020         ret = cma_modify_qp_rtr(&id_priv->id);
2021         if (ret)
2022                 return ret;
2023
2024         iw_param.ord = conn_param->initiator_depth;
2025         iw_param.ird = conn_param->responder_resources;
2026         iw_param.private_data = conn_param->private_data;
2027         iw_param.private_data_len = conn_param->private_data_len;
2028         if (id_priv->id.qp) {
2029                 iw_param.qpn = id_priv->qp_num;
2030         } else
2031                 iw_param.qpn = conn_param->qp_num;
2032
2033         return iw_cm_accept(id_priv->cm_id.iw, &iw_param);
2034 }
2035
2036 int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
2037 {
2038         struct rdma_id_private *id_priv;
2039         int ret;
2040
2041         id_priv = container_of(id, struct rdma_id_private, id);
2042         if (!cma_comp(id_priv, CMA_CONNECT))
2043                 return -EINVAL;
2044
2045         if (!id->qp && conn_param) {
2046                 id_priv->qp_num = conn_param->qp_num;
2047                 id_priv->srq = conn_param->srq;
2048         }
2049
2050         switch (rdma_node_get_transport(id->device->node_type)) {
2051         case RDMA_TRANSPORT_IB:
2052                 if (conn_param)
2053                         ret = cma_accept_ib(id_priv, conn_param);
2054                 else
2055                         ret = cma_rep_recv(id_priv);
2056                 break;
2057         case RDMA_TRANSPORT_IWARP:
2058                 ret = cma_accept_iw(id_priv, conn_param);
2059                 break;
2060         default:
2061                 ret = -ENOSYS;
2062                 break;
2063         }
2064
2065         if (ret)
2066                 goto reject;
2067
2068         return 0;
2069 reject:
2070         cma_modify_qp_err(id);
2071         rdma_reject(id, NULL, 0);
2072         return ret;
2073 }
2074 EXPORT_SYMBOL(rdma_accept);
2075
2076 int rdma_reject(struct rdma_cm_id *id, const void *private_data,
2077                 u8 private_data_len)
2078 {
2079         struct rdma_id_private *id_priv;
2080         int ret;
2081
2082         id_priv = container_of(id, struct rdma_id_private, id);
2083         if (!cma_comp(id_priv, CMA_CONNECT))
2084                 return -EINVAL;
2085
2086         switch (rdma_node_get_transport(id->device->node_type)) {
2087         case RDMA_TRANSPORT_IB:
2088                 ret = ib_send_cm_rej(id_priv->cm_id.ib,
2089                                      IB_CM_REJ_CONSUMER_DEFINED, NULL, 0,
2090                                      private_data, private_data_len);
2091                 break;
2092         case RDMA_TRANSPORT_IWARP:
2093                 ret = iw_cm_reject(id_priv->cm_id.iw,
2094                                    private_data, private_data_len);
2095                 break;
2096         default:
2097                 ret = -ENOSYS;
2098                 break;
2099         }
2100         return ret;
2101 }
2102 EXPORT_SYMBOL(rdma_reject);
2103
2104 int rdma_disconnect(struct rdma_cm_id *id)
2105 {
2106         struct rdma_id_private *id_priv;
2107         int ret;
2108
2109         id_priv = container_of(id, struct rdma_id_private, id);
2110         if (!cma_comp(id_priv, CMA_CONNECT) &&
2111             !cma_comp(id_priv, CMA_DISCONNECT))
2112                 return -EINVAL;
2113
2114         switch (rdma_node_get_transport(id->device->node_type)) {
2115         case RDMA_TRANSPORT_IB:
2116                 ret = cma_modify_qp_err(id);
2117                 if (ret)
2118                         goto out;
2119                 /* Initiate or respond to a disconnect. */
2120                 if (ib_send_cm_dreq(id_priv->cm_id.ib, NULL, 0))
2121                         ib_send_cm_drep(id_priv->cm_id.ib, NULL, 0);
2122                 break;
2123         case RDMA_TRANSPORT_IWARP:
2124                 ret = iw_cm_disconnect(id_priv->cm_id.iw, 0);
2125                 break;
2126         default:
2127                 ret = -EINVAL;
2128                 break;
2129         }
2130 out:
2131         return ret;
2132 }
2133 EXPORT_SYMBOL(rdma_disconnect);
2134
2135 static void cma_add_one(struct ib_device *device)
2136 {
2137         struct cma_device *cma_dev;
2138         struct rdma_id_private *id_priv;
2139
2140         cma_dev = kmalloc(sizeof *cma_dev, GFP_KERNEL);
2141         if (!cma_dev)
2142                 return;
2143
2144         cma_dev->device = device;
2145         cma_dev->node_guid = device->node_guid;
2146
2147         init_completion(&cma_dev->comp);
2148         atomic_set(&cma_dev->refcount, 1);
2149         INIT_LIST_HEAD(&cma_dev->id_list);
2150         ib_set_client_data(device, &cma_client, cma_dev);
2151
2152         mutex_lock(&lock);
2153         list_add_tail(&cma_dev->list, &dev_list);
2154         list_for_each_entry(id_priv, &listen_any_list, list)
2155                 cma_listen_on_dev(id_priv, cma_dev);
2156         mutex_unlock(&lock);
2157 }
2158
2159 static int cma_remove_id_dev(struct rdma_id_private *id_priv)
2160 {
2161         struct rdma_cm_event event;
2162         enum cma_state state;
2163
2164         /* Record that we want to remove the device */
2165         state = cma_exch(id_priv, CMA_DEVICE_REMOVAL);
2166         if (state == CMA_DESTROYING)
2167                 return 0;
2168
2169         cma_cancel_operation(id_priv, state);
2170         wait_event(id_priv->wait_remove, !atomic_read(&id_priv->dev_remove));
2171
2172         /* Check for destruction from another callback. */
2173         if (!cma_comp(id_priv, CMA_DEVICE_REMOVAL))
2174                 return 0;
2175
2176         memset(&event, 0, sizeof event);
2177         event.event = RDMA_CM_EVENT_DEVICE_REMOVAL;
2178         return id_priv->id.event_handler(&id_priv->id, &event);
2179 }
2180
2181 static void cma_process_remove(struct cma_device *cma_dev)
2182 {
2183         struct rdma_id_private *id_priv;
2184         int ret;
2185
2186         mutex_lock(&lock);
2187         while (!list_empty(&cma_dev->id_list)) {
2188                 id_priv = list_entry(cma_dev->id_list.next,
2189                                      struct rdma_id_private, list);
2190
2191                 if (cma_internal_listen(id_priv)) {
2192                         cma_destroy_listen(id_priv);
2193                         continue;
2194                 }
2195
2196                 list_del_init(&id_priv->list);
2197                 atomic_inc(&id_priv->refcount);
2198                 mutex_unlock(&lock);
2199
2200                 ret = cma_remove_id_dev(id_priv);
2201                 cma_deref_id(id_priv);
2202                 if (ret)
2203                         rdma_destroy_id(&id_priv->id);
2204
2205                 mutex_lock(&lock);
2206         }
2207         mutex_unlock(&lock);
2208
2209         cma_deref_dev(cma_dev);
2210         wait_for_completion(&cma_dev->comp);
2211 }
2212
2213 static void cma_remove_one(struct ib_device *device)
2214 {
2215         struct cma_device *cma_dev;
2216
2217         cma_dev = ib_get_client_data(device, &cma_client);
2218         if (!cma_dev)
2219                 return;
2220
2221         mutex_lock(&lock);
2222         list_del(&cma_dev->list);
2223         mutex_unlock(&lock);
2224
2225         cma_process_remove(cma_dev);
2226         kfree(cma_dev);
2227 }
2228
2229 static int cma_init(void)
2230 {
2231         int ret;
2232
2233         cma_wq = create_singlethread_workqueue("rdma_cm_wq");
2234         if (!cma_wq)
2235                 return -ENOMEM;
2236
2237         ib_sa_register_client(&sa_client);
2238         rdma_addr_register_client(&addr_client);
2239
2240         ret = ib_register_client(&cma_client);
2241         if (ret)
2242                 goto err;
2243         return 0;
2244
2245 err:
2246         rdma_addr_unregister_client(&addr_client);
2247         ib_sa_unregister_client(&sa_client);
2248         destroy_workqueue(cma_wq);
2249         return ret;
2250 }
2251
2252 static void cma_cleanup(void)
2253 {
2254         ib_unregister_client(&cma_client);
2255         rdma_addr_unregister_client(&addr_client);
2256         ib_sa_unregister_client(&sa_client);
2257         destroy_workqueue(cma_wq);
2258         idr_destroy(&sdp_ps);
2259         idr_destroy(&tcp_ps);
2260 }
2261
2262 module_init(cma_init);
2263 module_exit(cma_cleanup);