drivers/infiniband/core/cm.c

   1 /*
   2  * Copyright (c) 2004, 2005 Intel Corporation.  All rights reserved.
   3  * Copyright (c) 2004 Topspin Corporation.  All rights reserved.
   4  * Copyright (c) 2004, 2005 Voltaire Corporation.  All rights reserved.
   5  * Copyright (c) 2005 Sun Microsystems, Inc. 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  * $Id: cm.c 2821 2005-07-08 17:07:28Z sean.hefty $
  36  */
  37 #include <linux/dma-mapping.h>
  38 #include <linux/err.h>
  39 #include <linux/idr.h>
  40 #include <linux/interrupt.h>
  41 #include <linux/pci.h>
  42 #include <linux/rbtree.h>
  43 #include <linux/spinlock.h>
  44 #include <linux/workqueue.h>
  45
  46 #include <rdma/ib_cache.h>
  47 #include <rdma/ib_cm.h>
  48 #include "cm_msgs.h"
  49
  50 MODULE_AUTHOR("Sean Hefty");
  51 MODULE_DESCRIPTION("InfiniBand CM");
  52 MODULE_LICENSE("Dual BSD/GPL");
  53
  54 static void cm_add_one(struct ib_device *device);
  55 static void cm_remove_one(struct ib_device *device);
  56
  57 static struct ib_client cm_client = {
  58         .name   = "cm",
  59         .add    = cm_add_one,
  60         .remove = cm_remove_one
  61 };
  62
  63 static struct ib_cm {
  64         spinlock_t lock;
  65         struct list_head device_list;
  66         rwlock_t device_lock;
  67         struct rb_root listen_service_table;
  68         u64 listen_service_id;
  69         /* struct rb_root peer_service_table; todo: fix peer to peer */
  70         struct rb_root remote_qp_table;
  71         struct rb_root remote_id_table;
  72         struct rb_root remote_sidr_table;
  73         struct idr local_id_table;
  74         struct workqueue_struct *wq;
  75 } cm;
  76
  77 struct cm_port {
  78         struct cm_device *cm_dev;
  79         struct ib_mad_agent *mad_agent;
  80         u8 port_num;
  81 };
  82
  83 struct cm_device {
  84         struct list_head list;
  85         struct ib_device *device;
  86         __be64 ca_guid;
  87         struct cm_port port[0];
  88 };
  89
  90 struct cm_av {
  91         struct cm_port *port;
  92         union ib_gid dgid;
  93         struct ib_ah_attr ah_attr;
  94         u16 pkey_index;
  95         u8 packet_life_time;
  96 };
  97
  98 struct cm_work {
  99         struct work_struct work;
 100         struct list_head list;
 101         struct cm_port *port;
 102         struct ib_mad_recv_wc *mad_recv_wc;     /* Received MADs */
 103         __be32 local_id;                        /* Established / timewait */
 104         __be32 remote_id;
 105         struct ib_cm_event cm_event;
 106         struct ib_sa_path_rec path[0];
 107 };
 108
 109 struct cm_timewait_info {
 110         struct cm_work work;                    /* Must be first. */
 111         struct rb_node remote_qp_node;
 112         struct rb_node remote_id_node;
 113         __be64 remote_ca_guid;
 114         __be32 remote_qpn;
 115         u8 inserted_remote_qp;
 116         u8 inserted_remote_id;
 117 };
 118
 119 struct cm_id_private {
 120         struct ib_cm_id id;
 121
 122         struct rb_node service_node;
 123         struct rb_node sidr_id_node;
 124         spinlock_t lock;
 125         wait_queue_head_t wait;
 126         atomic_t refcount;
 127
 128         struct ib_mad_send_buf *msg;
 129         struct cm_timewait_info *timewait_info;
 130         /* todo: use alternate port on send failure */
 131         struct cm_av av;
 132         struct cm_av alt_av;
 133
 134         void *private_data;
 135         __be64 tid;
 136         __be32 local_qpn;
 137         __be32 remote_qpn;
 138         __be32 sq_psn;
 139         __be32 rq_psn;
 140         int timeout_ms;
 141         enum ib_mtu path_mtu;
 142         u8 private_data_len;
 143         u8 max_cm_retries;
 144         u8 peer_to_peer;
 145         u8 responder_resources;
 146         u8 initiator_depth;
 147         u8 local_ack_timeout;
 148         u8 retry_count;
 149         u8 rnr_retry_count;
 150         u8 service_timeout;
 151
 152         struct list_head work_list;
 153         atomic_t work_count;
 154 };
 155
 156 static void cm_work_handler(void *data);
 157
 158 static inline void cm_deref_id(struct cm_id_private *cm_id_priv)
 159 {
 160         if (atomic_dec_and_test(&cm_id_priv->refcount))
 161                 wake_up(&cm_id_priv->wait);
 162 }
 163
 164 static int cm_alloc_msg(struct cm_id_private *cm_id_priv,
 165                         struct ib_mad_send_buf **msg)
 166 {
 167         struct ib_mad_agent *mad_agent;
 168         struct ib_mad_send_buf *m;
 169         struct ib_ah *ah;
 170
 171         mad_agent = cm_id_priv->av.port->mad_agent;
 172         ah = ib_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr);
 173         if (IS_ERR(ah))
 174                 return PTR_ERR(ah);
 175
 176         m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn,
 177                                cm_id_priv->av.pkey_index,
 178                                ah, 0, sizeof(struct ib_mad_hdr),
 179                                sizeof(struct ib_mad)-sizeof(struct ib_mad_hdr),
 180                                GFP_ATOMIC);
 181         if (IS_ERR(m)) {
 182                 ib_destroy_ah(ah);
 183                 return PTR_ERR(m);
 184         }
 185
 186         /* Timeout set by caller if response is expected. */
 187         m->send_wr.wr.ud.retries = cm_id_priv->max_cm_retries;
 188
 189         atomic_inc(&cm_id_priv->refcount);
 190         m->context[0] = cm_id_priv;
 191         *msg = m;
 192         return 0;
 193 }
 194
 195 static int cm_alloc_response_msg(struct cm_port *port,
 196                                  struct ib_mad_recv_wc *mad_recv_wc,
 197                                  struct ib_mad_send_buf **msg)
 198 {
 199         struct ib_mad_send_buf *m;
 200         struct ib_ah *ah;
 201
 202         ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc,
 203                                   mad_recv_wc->recv_buf.grh, port->port_num);
 204         if (IS_ERR(ah))
 205                 return PTR_ERR(ah);
 206
 207         m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index,
 208                                ah, 0, sizeof(struct ib_mad_hdr),
 209                                sizeof(struct ib_mad)-sizeof(struct ib_mad_hdr),
 210                                GFP_ATOMIC);
 211         if (IS_ERR(m)) {
 212                 ib_destroy_ah(ah);
 213                 return PTR_ERR(m);
 214         }
 215         *msg = m;
 216         return 0;
 217 }
 218
 219 static void cm_free_msg(struct ib_mad_send_buf *msg)
 220 {
 221         ib_destroy_ah(msg->send_wr.wr.ud.ah);
 222         if (msg->context[0])
 223                 cm_deref_id(msg->context[0]);
 224         ib_free_send_mad(msg);
 225 }
 226
 227 static void * cm_copy_private_data(const void *private_data,
 228                                    u8 private_data_len)
 229 {
 230         void *data;
 231
 232         if (!private_data || !private_data_len)
 233                 return NULL;
 234
 235         data = kmalloc(private_data_len, GFP_KERNEL);
 236         if (!data)
 237                 return ERR_PTR(-ENOMEM);
 238
 239         memcpy(data, private_data, private_data_len);
 240         return data;
 241 }
 242
 243 static void cm_set_private_data(struct cm_id_private *cm_id_priv,
 244                                  void *private_data, u8 private_data_len)
 245 {
 246         if (cm_id_priv->private_data && cm_id_priv->private_data_len)
 247                 kfree(cm_id_priv->private_data);
 248
 249         cm_id_priv->private_data = private_data;
 250         cm_id_priv->private_data_len = private_data_len;
 251 }
 252
 253 static void cm_set_ah_attr(struct ib_ah_attr *ah_attr, u8 port_num,
 254                            u16 dlid, u8 sl, u16 src_path_bits)
 255 {
 256         memset(ah_attr, 0, sizeof ah_attr);
 257         ah_attr->dlid = dlid;
 258         ah_attr->sl = sl;
 259         ah_attr->src_path_bits = src_path_bits;
 260         ah_attr->port_num = port_num;
 261 }
 262
 263 static void cm_init_av_for_response(struct cm_port *port,
 264                                     struct ib_wc *wc, struct cm_av *av)
 265 {
 266         av->port = port;
 267         av->pkey_index = wc->pkey_index;
 268         cm_set_ah_attr(&av->ah_attr, port->port_num, wc->slid,
 269                        wc->sl, wc->dlid_path_bits);
 270 }
 271
 272 static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av)
 273 {
 274         struct cm_device *cm_dev;
 275         struct cm_port *port = NULL;
 276         unsigned long flags;
 277         int ret;
 278         u8 p;
 279
 280         read_lock_irqsave(&cm.device_lock, flags);
 281         list_for_each_entry(cm_dev, &cm.device_list, list) {
 282                 if (!ib_find_cached_gid(cm_dev->device, &path->sgid,
 283                                         &p, NULL)) {
 284                         port = &cm_dev->port[p-1];
 285                         break;
 286                 }
 287         }
 288         read_unlock_irqrestore(&cm.device_lock, flags);
 289
 290         if (!port)
 291                 return -EINVAL;
 292
 293         ret = ib_find_cached_pkey(cm_dev->device, port->port_num,
 294                                   be16_to_cpu(path->pkey), &av->pkey_index);
 295         if (ret)
 296                 return ret;
 297
 298         av->port = port;
 299         cm_set_ah_attr(&av->ah_attr, av->port->port_num,
 300                        be16_to_cpu(path->dlid), path->sl,
 301                        be16_to_cpu(path->slid) & 0x7F);
 302         av->packet_life_time = path->packet_life_time;
 303         return 0;
 304 }
 305
 306 static int cm_alloc_id(struct cm_id_private *cm_id_priv)
 307 {
 308         unsigned long flags;
 309         int ret;
 310
 311         do {
 312                 spin_lock_irqsave(&cm.lock, flags);
 313                 ret = idr_get_new_above(&cm.local_id_table, cm_id_priv, 1,
 314                                         (__force int *) &cm_id_priv->id.local_id);
 315                 spin_unlock_irqrestore(&cm.lock, flags);
 316         } while( (ret == -EAGAIN) && idr_pre_get(&cm.local_id_table, GFP_KERNEL) );
 317         return ret;
 318 }
 319
 320 static void cm_free_id(__be32 local_id)
 321 {
 322         unsigned long flags;
 323
 324         spin_lock_irqsave(&cm.lock, flags);
 325         idr_remove(&cm.local_id_table, (__force int) local_id);
 326         spin_unlock_irqrestore(&cm.lock, flags);
 327 }
 328
 329 static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id)
 330 {
 331         struct cm_id_private *cm_id_priv;
 332
 333         cm_id_priv = idr_find(&cm.local_id_table, (__force int) local_id);
 334         if (cm_id_priv) {
 335                 if (cm_id_priv->id.remote_id == remote_id)
 336                         atomic_inc(&cm_id_priv->refcount);
 337                 else
 338                         cm_id_priv = NULL;
 339         }
 340
 341         return cm_id_priv;
 342 }
 343
 344 static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id)
 345 {
 346         struct cm_id_private *cm_id_priv;
 347         unsigned long flags;
 348
 349         spin_lock_irqsave(&cm.lock, flags);
 350         cm_id_priv = cm_get_id(local_id, remote_id);
 351         spin_unlock_irqrestore(&cm.lock, flags);
 352
 353         return cm_id_priv;
 354 }
 355
 356 static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv)
 357 {
 358         struct rb_node **link = &cm.listen_service_table.rb_node;
 359         struct rb_node *parent = NULL;
 360         struct cm_id_private *cur_cm_id_priv;
 361         __be64 service_id = cm_id_priv->id.service_id;
 362         __be64 service_mask = cm_id_priv->id.service_mask;
 363
 364         while (*link) {
 365                 parent = *link;
 366                 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
 367                                           service_node);
 368                 if ((cur_cm_id_priv->id.service_mask & service_id) ==
 369                     (service_mask & cur_cm_id_priv->id.service_id) &&
 370                     (cm_id_priv->id.device == cur_cm_id_priv->id.device))
 371                         return cur_cm_id_priv;
 372
 373                 if (cm_id_priv->id.device < cur_cm_id_priv->id.device)
 374                         link = &(*link)->rb_left;
 375                 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device)
 376                         link = &(*link)->rb_right;
 377                 else if (service_id < cur_cm_id_priv->id.service_id)
 378                         link = &(*link)->rb_left;
 379                 else
 380                         link = &(*link)->rb_right;
 381         }
 382         rb_link_node(&cm_id_priv->service_node, parent, link);
 383         rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table);
 384         return NULL;
 385 }
 386
 387 static struct cm_id_private * cm_find_listen(struct ib_device *device,
 388                                              __be64 service_id)
 389 {
 390         struct rb_node *node = cm.listen_service_table.rb_node;
 391         struct cm_id_private *cm_id_priv;
 392
 393         while (node) {
 394                 cm_id_priv = rb_entry(node, struct cm_id_private, service_node);
 395                 if ((cm_id_priv->id.service_mask & service_id) ==
 396                      cm_id_priv->id.service_id &&
 397                     (cm_id_priv->id.device == device))
 398                         return cm_id_priv;
 399
 400                 if (device < cm_id_priv->id.device)
 401                         node = node->rb_left;
 402                 else if (device > cm_id_priv->id.device)
 403                         node = node->rb_right;
 404                 else if (service_id < cm_id_priv->id.service_id)
 405                         node = node->rb_left;
 406                 else
 407                         node = node->rb_right;
 408         }
 409         return NULL;
 410 }
 411
 412 static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info
 413                                                      *timewait_info)
 414 {
 415         struct rb_node **link = &cm.remote_id_table.rb_node;
 416         struct rb_node *parent = NULL;
 417         struct cm_timewait_info *cur_timewait_info;
 418         __be64 remote_ca_guid = timewait_info->remote_ca_guid;
 419         __be32 remote_id = timewait_info->work.remote_id;
 420
 421         while (*link) {
 422                 parent = *link;
 423                 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
 424                                              remote_id_node);
 425                 if (remote_id < cur_timewait_info->work.remote_id)
 426                         link = &(*link)->rb_left;
 427                 else if (remote_id > cur_timewait_info->work.remote_id)
 428                         link = &(*link)->rb_right;
 429                 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid)
 430                         link = &(*link)->rb_left;
 431                 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid)
 432                         link = &(*link)->rb_right;
 433                 else
 434                         return cur_timewait_info;
 435         }
 436         timewait_info->inserted_remote_id = 1;
 437         rb_link_node(&timewait_info->remote_id_node, parent, link);
 438         rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table);
 439         return NULL;
 440 }
 441
 442 static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid,
 443                                                    __be32 remote_id)
 444 {
 445         struct rb_node *node = cm.remote_id_table.rb_node;
 446         struct cm_timewait_info *timewait_info;
 447
 448         while (node) {
 449                 timewait_info = rb_entry(node, struct cm_timewait_info,
 450                                          remote_id_node);
 451                 if (remote_id < timewait_info->work.remote_id)
 452                         node = node->rb_left;
 453                 else if (remote_id > timewait_info->work.remote_id)
 454                         node = node->rb_right;
 455                 else if (remote_ca_guid < timewait_info->remote_ca_guid)
 456                         node = node->rb_left;
 457                 else if (remote_ca_guid > timewait_info->remote_ca_guid)
 458                         node = node->rb_right;
 459                 else
 460                         return timewait_info;
 461         }
 462         return NULL;
 463 }
 464
 465 static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info
 466                                                       *timewait_info)
 467 {
 468         struct rb_node **link = &cm.remote_qp_table.rb_node;
 469         struct rb_node *parent = NULL;
 470         struct cm_timewait_info *cur_timewait_info;
 471         __be64 remote_ca_guid = timewait_info->remote_ca_guid;
 472         __be32 remote_qpn = timewait_info->remote_qpn;
 473
 474         while (*link) {
 475                 parent = *link;
 476                 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
 477                                              remote_qp_node);
 478                 if (remote_qpn < cur_timewait_info->remote_qpn)
 479                         link = &(*link)->rb_left;
 480                 else if (remote_qpn > cur_timewait_info->remote_qpn)
 481                         link = &(*link)->rb_right;
 482                 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid)
 483                         link = &(*link)->rb_left;
 484                 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid)
 485                         link = &(*link)->rb_right;
 486                 else
 487                         return cur_timewait_info;
 488         }
 489         timewait_info->inserted_remote_qp = 1;
 490         rb_link_node(&timewait_info->remote_qp_node, parent, link);
 491         rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table);
 492         return NULL;
 493 }
 494
 495 static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private
 496                                                     *cm_id_priv)
 497 {
 498         struct rb_node **link = &cm.remote_sidr_table.rb_node;
 499         struct rb_node *parent = NULL;
 500         struct cm_id_private *cur_cm_id_priv;
 501         union ib_gid *port_gid = &cm_id_priv->av.dgid;
 502         __be32 remote_id = cm_id_priv->id.remote_id;
 503
 504         while (*link) {
 505                 parent = *link;
 506                 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
 507                                           sidr_id_node);
 508                 if (remote_id < cur_cm_id_priv->id.remote_id)
 509                         link = &(*link)->rb_left;
 510                 else if (remote_id > cur_cm_id_priv->id.remote_id)
 511                         link = &(*link)->rb_right;
 512                 else {
 513                         int cmp;
 514                         cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid,
 515                                      sizeof *port_gid);
 516                         if (cmp < 0)
 517                                 link = &(*link)->rb_left;
 518                         else if (cmp > 0)
 519                                 link = &(*link)->rb_right;
 520                         else
 521                                 return cur_cm_id_priv;
 522                 }
 523         }
 524         rb_link_node(&cm_id_priv->sidr_id_node, parent, link);
 525         rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
 526         return NULL;
 527 }
 528
 529 static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv,
 530                                enum ib_cm_sidr_status status)
 531 {
 532         struct ib_cm_sidr_rep_param param;
 533
 534         memset(&param, 0, sizeof param);
 535         param.status = status;
 536         ib_send_cm_sidr_rep(&cm_id_priv->id, &param);
 537 }
 538
 539 struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
 540                                  ib_cm_handler cm_handler,
 541                                  void *context)
 542 {
 543         struct cm_id_private *cm_id_priv;
 544         int ret;
 545
 546         cm_id_priv = kmalloc(sizeof *cm_id_priv, GFP_KERNEL);
 547         if (!cm_id_priv)
 548                 return ERR_PTR(-ENOMEM);
 549
 550         memset(cm_id_priv, 0, sizeof *cm_id_priv);
 551         cm_id_priv->id.state = IB_CM_IDLE;
 552         cm_id_priv->id.device = device;
 553         cm_id_priv->id.cm_handler = cm_handler;
 554         cm_id_priv->id.context = context;
 555         cm_id_priv->id.remote_cm_qpn = 1;
 556         ret = cm_alloc_id(cm_id_priv);
 557         if (ret)
 558                 goto error;
 559
 560         spin_lock_init(&cm_id_priv->lock);
 561         init_waitqueue_head(&cm_id_priv->wait);
 562         INIT_LIST_HEAD(&cm_id_priv->work_list);
 563         atomic_set(&cm_id_priv->work_count, -1);
 564         atomic_set(&cm_id_priv->refcount, 1);
 565         return &cm_id_priv->id;
 566
 567 error:
 568         kfree(cm_id_priv);
 569         return ERR_PTR(-ENOMEM);
 570 }
 571 EXPORT_SYMBOL(ib_create_cm_id);
 572
 573 static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv)
 574 {
 575         struct cm_work *work;
 576
 577         if (list_empty(&cm_id_priv->work_list))
 578                 return NULL;
 579
 580         work = list_entry(cm_id_priv->work_list.next, struct cm_work, list);
 581         list_del(&work->list);
 582         return work;
 583 }
 584
 585 static void cm_free_work(struct cm_work *work)
 586 {
 587         if (work->mad_recv_wc)
 588                 ib_free_recv_mad(work->mad_recv_wc);
 589         kfree(work);
 590 }
 591
 592 static inline int cm_convert_to_ms(int iba_time)
 593 {
 594         /* approximate conversion to ms from 4.096us x 2^iba_time */
 595         return 1 << max(iba_time - 8, 0);
 596 }
 597
 598 static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info)
 599 {
 600         unsigned long flags;
 601
 602         if (!timewait_info->inserted_remote_id &&
 603             !timewait_info->inserted_remote_qp)
 604             return;
 605
 606         spin_lock_irqsave(&cm.lock, flags);
 607         if (timewait_info->inserted_remote_id) {
 608                 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table);
 609                 timewait_info->inserted_remote_id = 0;
 610         }
 611
 612         if (timewait_info->inserted_remote_qp) {
 613                 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table);
 614                 timewait_info->inserted_remote_qp = 0;
 615         }
 616         spin_unlock_irqrestore(&cm.lock, flags);
 617 }
 618
 619 static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id)
 620 {
 621         struct cm_timewait_info *timewait_info;
 622
 623         timewait_info = kmalloc(sizeof *timewait_info, GFP_KERNEL);
 624         if (!timewait_info)
 625                 return ERR_PTR(-ENOMEM);
 626         memset(timewait_info, 0, sizeof *timewait_info);
 627
 628         timewait_info->work.local_id = local_id;
 629         INIT_WORK(&timewait_info->work.work, cm_work_handler,
 630                   &timewait_info->work);
 631         timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT;
 632         return timewait_info;
 633 }
 634
 635 static void cm_enter_timewait(struct cm_id_private *cm_id_priv)
 636 {
 637         int wait_time;
 638
 639         /*
 640          * The cm_id could be destroyed by the user before we exit timewait.
 641          * To protect against this, we search for the cm_id after exiting
 642          * timewait before notifying the user that we've exited timewait.
 643          */
 644         cm_id_priv->id.state = IB_CM_TIMEWAIT;
 645         wait_time = cm_convert_to_ms(cm_id_priv->local_ack_timeout);
 646         queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work,
 647                            msecs_to_jiffies(wait_time));
 648         cm_id_priv->timewait_info = NULL;
 649 }
 650
 651 static void cm_reset_to_idle(struct cm_id_private *cm_id_priv)
 652 {
 653         cm_id_priv->id.state = IB_CM_IDLE;
 654         if (cm_id_priv->timewait_info) {
 655                 cm_cleanup_timewait(cm_id_priv->timewait_info);
 656                 kfree(cm_id_priv->timewait_info);
 657                 cm_id_priv->timewait_info = NULL;
 658         }
 659 }
 660
 661 void ib_destroy_cm_id(struct ib_cm_id *cm_id)
 662 {
 663         struct cm_id_private *cm_id_priv;
 664         struct cm_work *work;
 665         unsigned long flags;
 666
 667         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
 668 retest:
 669         spin_lock_irqsave(&cm_id_priv->lock, flags);
 670         switch (cm_id->state) {
 671         case IB_CM_LISTEN:
 672                 cm_id->state = IB_CM_IDLE;
 673                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 674                 spin_lock_irqsave(&cm.lock, flags);
 675                 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table);
 676                 spin_unlock_irqrestore(&cm.lock, flags);
 677                 break;
 678         case IB_CM_SIDR_REQ_SENT:
 679                 cm_id->state = IB_CM_IDLE;
 680                 ib_cancel_mad(cm_id_priv->av.port->mad_agent,
 681                               (unsigned long) cm_id_priv->msg);
 682                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 683                 break;
 684         case IB_CM_SIDR_REQ_RCVD:
 685                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 686                 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT);
 687                 break;
 688         case IB_CM_REQ_SENT:
 689         case IB_CM_MRA_REQ_RCVD:
 690         case IB_CM_REP_SENT:
 691         case IB_CM_MRA_REP_RCVD:
 692                 ib_cancel_mad(cm_id_priv->av.port->mad_agent,
 693                               (unsigned long) cm_id_priv->msg);
 694                 /* Fall through */
 695         case IB_CM_REQ_RCVD:
 696         case IB_CM_MRA_REQ_SENT:
 697         case IB_CM_REP_RCVD:
 698         case IB_CM_MRA_REP_SENT:
 699                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 700                 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT,
 701                                &cm_id_priv->av.port->cm_dev->ca_guid,
 702                                sizeof cm_id_priv->av.port->cm_dev->ca_guid,
 703                                NULL, 0);
 704                 break;
 705         case IB_CM_ESTABLISHED:
 706                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 707                 ib_send_cm_dreq(cm_id, NULL, 0);
 708                 goto retest;
 709         case IB_CM_DREQ_SENT:
 710                 ib_cancel_mad(cm_id_priv->av.port->mad_agent,
 711                               (unsigned long) cm_id_priv->msg);
 712                 cm_enter_timewait(cm_id_priv);
 713                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 714                 break;
 715         case IB_CM_DREQ_RCVD:
 716                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 717                 ib_send_cm_drep(cm_id, NULL, 0);
 718                 break;
 719         default:
 720                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 721                 break;
 722         }
 723
 724         cm_free_id(cm_id->local_id);
 725         atomic_dec(&cm_id_priv->refcount);
 726         wait_event(cm_id_priv->wait, !atomic_read(&cm_id_priv->refcount));
 727         while ((work = cm_dequeue_work(cm_id_priv)) != NULL)
 728                 cm_free_work(work);
 729         if (cm_id_priv->private_data && cm_id_priv->private_data_len)
 730                 kfree(cm_id_priv->private_data);
 731         kfree(cm_id_priv);
 732 }
 733 EXPORT_SYMBOL(ib_destroy_cm_id);
 734
 735 int ib_cm_listen(struct ib_cm_id *cm_id,
 736                  __be64 service_id,
 737                  __be64 service_mask)
 738 {
 739         struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
 740         unsigned long flags;
 741         int ret = 0;
 742
 743         service_mask = service_mask ? service_mask :
 744                        __constant_cpu_to_be64(~0ULL);
 745         service_id &= service_mask;
 746         if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID &&
 747             (service_id != IB_CM_ASSIGN_SERVICE_ID))
 748                 return -EINVAL;
 749
 750         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
 751         BUG_ON(cm_id->state != IB_CM_IDLE);
 752
 753         cm_id->state = IB_CM_LISTEN;
 754
 755         spin_lock_irqsave(&cm.lock, flags);
 756         if (service_id == IB_CM_ASSIGN_SERVICE_ID) {
 757                 cm_id->service_id = cpu_to_be64(cm.listen_service_id++);
 758                 cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
 759         } else {
 760                 cm_id->service_id = service_id;
 761                 cm_id->service_mask = service_mask;
 762         }
 763         cur_cm_id_priv = cm_insert_listen(cm_id_priv);
 764         spin_unlock_irqrestore(&cm.lock, flags);
 765
 766         if (cur_cm_id_priv) {
 767                 cm_id->state = IB_CM_IDLE;
 768                 ret = -EBUSY;
 769         }
 770         return ret;
 771 }
 772 EXPORT_SYMBOL(ib_cm_listen);
 773
 774 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv,
 775                           enum cm_msg_sequence msg_seq)
 776 {
 777         u64 hi_tid, low_tid;
 778
 779         hi_tid   = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32;
 780         low_tid  = (u64) ((__force u32)cm_id_priv->id.local_id |
 781                           (msg_seq << 30));
 782         return cpu_to_be64(hi_tid | low_tid);
 783 }
 784
 785 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr,
 786                               __be16 attr_id, __be64 tid)
 787 {
 788         hdr->base_version  = IB_MGMT_BASE_VERSION;
 789         hdr->mgmt_class    = IB_MGMT_CLASS_CM;
 790         hdr->class_version = IB_CM_CLASS_VERSION;
 791         hdr->method        = IB_MGMT_METHOD_SEND;
 792         hdr->attr_id       = attr_id;
 793         hdr->tid           = tid;
 794 }
 795
 796 static void cm_format_req(struct cm_req_msg *req_msg,
 797                           struct cm_id_private *cm_id_priv,
 798                           struct ib_cm_req_param *param)
 799 {
 800         cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID,
 801                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ));
 802
 803         req_msg->local_comm_id = cm_id_priv->id.local_id;
 804         req_msg->service_id = param->service_id;
 805         req_msg->local_ca_guid = cm_id_priv->av.port->cm_dev->ca_guid;
 806         cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num));
 807         cm_req_set_resp_res(req_msg, param->responder_resources);
 808         cm_req_set_init_depth(req_msg, param->initiator_depth);
 809         cm_req_set_remote_resp_timeout(req_msg,
 810                                        param->remote_cm_response_timeout);
 811         cm_req_set_qp_type(req_msg, param->qp_type);
 812         cm_req_set_flow_ctrl(req_msg, param->flow_control);
 813         cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn));
 814         cm_req_set_local_resp_timeout(req_msg,
 815                                       param->local_cm_response_timeout);
 816         cm_req_set_retry_count(req_msg, param->retry_count);
 817         req_msg->pkey = param->primary_path->pkey;
 818         cm_req_set_path_mtu(req_msg, param->primary_path->mtu);
 819         cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count);
 820         cm_req_set_max_cm_retries(req_msg, param->max_cm_retries);
 821         cm_req_set_srq(req_msg, param->srq);
 822
 823         req_msg->primary_local_lid = param->primary_path->slid;
 824         req_msg->primary_remote_lid = param->primary_path->dlid;
 825         req_msg->primary_local_gid = param->primary_path->sgid;
 826         req_msg->primary_remote_gid = param->primary_path->dgid;
 827         cm_req_set_primary_flow_label(req_msg, param->primary_path->flow_label);
 828         cm_req_set_primary_packet_rate(req_msg, param->primary_path->rate);
 829         req_msg->primary_traffic_class = param->primary_path->traffic_class;
 830         req_msg->primary_hop_limit = param->primary_path->hop_limit;
 831         cm_req_set_primary_sl(req_msg, param->primary_path->sl);
 832         cm_req_set_primary_subnet_local(req_msg, 1); /* local only... */
 833         cm_req_set_primary_local_ack_timeout(req_msg,
 834                 min(31, param->primary_path->packet_life_time + 1));
 835
 836         if (param->alternate_path) {
 837                 req_msg->alt_local_lid = param->alternate_path->slid;
 838                 req_msg->alt_remote_lid = param->alternate_path->dlid;
 839                 req_msg->alt_local_gid = param->alternate_path->sgid;
 840                 req_msg->alt_remote_gid = param->alternate_path->dgid;
 841                 cm_req_set_alt_flow_label(req_msg,
 842                                           param->alternate_path->flow_label);
 843                 cm_req_set_alt_packet_rate(req_msg, param->alternate_path->rate);
 844                 req_msg->alt_traffic_class = param->alternate_path->traffic_class;
 845                 req_msg->alt_hop_limit = param->alternate_path->hop_limit;
 846                 cm_req_set_alt_sl(req_msg, param->alternate_path->sl);
 847                 cm_req_set_alt_subnet_local(req_msg, 1); /* local only... */
 848                 cm_req_set_alt_local_ack_timeout(req_msg,
 849                         min(31, param->alternate_path->packet_life_time + 1));
 850         }
 851
 852         if (param->private_data && param->private_data_len)
 853                 memcpy(req_msg->private_data, param->private_data,
 854                        param->private_data_len);
 855 }
 856
 857 static inline int cm_validate_req_param(struct ib_cm_req_param *param)
 858 {
 859         /* peer-to-peer not supported */
 860         if (param->peer_to_peer)
 861                 return -EINVAL;
 862
 863         if (!param->primary_path)
 864                 return -EINVAL;
 865
 866         if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC)
 867                 return -EINVAL;
 868
 869         if (param->private_data &&
 870             param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE)
 871                 return -EINVAL;
 872
 873         if (param->alternate_path &&
 874             (param->alternate_path->pkey != param->primary_path->pkey ||
 875              param->alternate_path->mtu != param->primary_path->mtu))
 876                 return -EINVAL;
 877
 878         return 0;
 879 }
 880
 881 int ib_send_cm_req(struct ib_cm_id *cm_id,
 882                    struct ib_cm_req_param *param)
 883 {
 884         struct cm_id_private *cm_id_priv;
 885         struct ib_send_wr *bad_send_wr;
 886         struct cm_req_msg *req_msg;
 887         unsigned long flags;
 888         int ret;
 889
 890         ret = cm_validate_req_param(param);
 891         if (ret)
 892                 return ret;
 893
 894         /* Verify that we're not in timewait. */
 895         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
 896         spin_lock_irqsave(&cm_id_priv->lock, flags);
 897         if (cm_id->state != IB_CM_IDLE) {
 898                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 899                 ret = -EINVAL;
 900                 goto out;
 901         }
 902         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 903
 904         cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
 905                                                             id.local_id);
 906         if (IS_ERR(cm_id_priv->timewait_info))
 907                 goto out;
 908
 909         ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av);
 910         if (ret)
 911                 goto error1;
 912         if (param->alternate_path) {
 913                 ret = cm_init_av_by_path(param->alternate_path,
 914                                          &cm_id_priv->alt_av);
 915                 if (ret)
 916                         goto error1;
 917         }
 918         cm_id->service_id = param->service_id;
 919         cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
 920         cm_id_priv->timeout_ms = cm_convert_to_ms(
 921                                     param->primary_path->packet_life_time) * 2 +
 922                                  cm_convert_to_ms(
 923                                     param->remote_cm_response_timeout);
 924         cm_id_priv->max_cm_retries = param->max_cm_retries;
 925         cm_id_priv->initiator_depth = param->initiator_depth;
 926         cm_id_priv->responder_resources = param->responder_resources;
 927         cm_id_priv->retry_count = param->retry_count;
 928         cm_id_priv->path_mtu = param->primary_path->mtu;
 929
 930         ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg);
 931         if (ret)
 932                 goto error1;
 933
 934         req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad;
 935         cm_format_req(req_msg, cm_id_priv, param);
 936         cm_id_priv->tid = req_msg->hdr.tid;
 937         cm_id_priv->msg->send_wr.wr.ud.timeout_ms = cm_id_priv->timeout_ms;
 938         cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT;
 939
 940         cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg);
 941         cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg);
 942         cm_id_priv->local_ack_timeout =
 943                                 cm_req_get_primary_local_ack_timeout(req_msg);
 944
 945         spin_lock_irqsave(&cm_id_priv->lock, flags);
 946         ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent,
 947                                 &cm_id_priv->msg->send_wr, &bad_send_wr);
 948         if (ret) {
 949                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 950                 goto error2;
 951         }
 952         BUG_ON(cm_id->state != IB_CM_IDLE);
 953         cm_id->state = IB_CM_REQ_SENT;
 954         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 955         return 0;
 956
 957 error2: cm_free_msg(cm_id_priv->msg);
 958 error1: kfree(cm_id_priv->timewait_info);
 959 out:    return ret;
 960 }
 961 EXPORT_SYMBOL(ib_send_cm_req);
 962
 963 static int cm_issue_rej(struct cm_port *port,
 964                         struct ib_mad_recv_wc *mad_recv_wc,
 965                         enum ib_cm_rej_reason reason,
 966                         enum cm_msg_response msg_rejected,
 967                         void *ari, u8 ari_length)
 968 {
 969         struct ib_mad_send_buf *msg = NULL;
 970         struct ib_send_wr *bad_send_wr;
 971         struct cm_rej_msg *rej_msg, *rcv_msg;
 972         int ret;
 973
 974         ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
 975         if (ret)
 976                 return ret;
 977
 978         /* We just need common CM header information.  Cast to any message. */
 979         rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad;
 980         rej_msg = (struct cm_rej_msg *) msg->mad;
 981
 982         cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid);
 983         rej_msg->remote_comm_id = rcv_msg->local_comm_id;
 984         rej_msg->local_comm_id = rcv_msg->remote_comm_id;
 985         cm_rej_set_msg_rejected(rej_msg, msg_rejected);
 986         rej_msg->reason = cpu_to_be16(reason);
 987
 988         if (ari && ari_length) {
 989                 cm_rej_set_reject_info_len(rej_msg, ari_length);
 990                 memcpy(rej_msg->ari, ari, ari_length);
 991         }
 992
 993         ret = ib_post_send_mad(port->mad_agent, &msg->send_wr, &bad_send_wr);
 994         if (ret)
 995                 cm_free_msg(msg);
 996
 997         return ret;
 998 }
 999
1000 static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid,
1001                                     __be32 local_qpn, __be32 remote_qpn)
1002 {
1003         return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) ||
1004                 ((local_ca_guid == remote_ca_guid) &&
1005                  (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn))));
1006 }
1007
1008 static inline void cm_format_paths_from_req(struct cm_req_msg *req_msg,
1009                                             struct ib_sa_path_rec *primary_path,
1010                                             struct ib_sa_path_rec *alt_path)
1011 {
1012         memset(primary_path, 0, sizeof *primary_path);
1013         primary_path->dgid = req_msg->primary_local_gid;
1014         primary_path->sgid = req_msg->primary_remote_gid;
1015         primary_path->dlid = req_msg->primary_local_lid;
1016         primary_path->slid = req_msg->primary_remote_lid;
1017         primary_path->flow_label = cm_req_get_primary_flow_label(req_msg);
1018         primary_path->hop_limit = req_msg->primary_hop_limit;
1019         primary_path->traffic_class = req_msg->primary_traffic_class;
1020         primary_path->reversible = 1;
1021         primary_path->pkey = req_msg->pkey;
1022         primary_path->sl = cm_req_get_primary_sl(req_msg);
1023         primary_path->mtu_selector = IB_SA_EQ;
1024         primary_path->mtu = cm_req_get_path_mtu(req_msg);
1025         primary_path->rate_selector = IB_SA_EQ;
1026         primary_path->rate = cm_req_get_primary_packet_rate(req_msg);
1027         primary_path->packet_life_time_selector = IB_SA_EQ;
1028         primary_path->packet_life_time =
1029                 cm_req_get_primary_local_ack_timeout(req_msg);
1030         primary_path->packet_life_time -= (primary_path->packet_life_time > 0);
1031
1032         if (req_msg->alt_local_lid) {
1033                 memset(alt_path, 0, sizeof *alt_path);
1034                 alt_path->dgid = req_msg->alt_local_gid;
1035                 alt_path->sgid = req_msg->alt_remote_gid;
1036                 alt_path->dlid = req_msg->alt_local_lid;
1037                 alt_path->slid = req_msg->alt_remote_lid;
1038                 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg);
1039                 alt_path->hop_limit = req_msg->alt_hop_limit;
1040                 alt_path->traffic_class = req_msg->alt_traffic_class;
1041                 alt_path->reversible = 1;
1042                 alt_path->pkey = req_msg->pkey;
1043                 alt_path->sl = cm_req_get_alt_sl(req_msg);
1044                 alt_path->mtu_selector = IB_SA_EQ;
1045                 alt_path->mtu = cm_req_get_path_mtu(req_msg);
1046                 alt_path->rate_selector = IB_SA_EQ;
1047                 alt_path->rate = cm_req_get_alt_packet_rate(req_msg);
1048                 alt_path->packet_life_time_selector = IB_SA_EQ;
1049                 alt_path->packet_life_time =
1050                         cm_req_get_alt_local_ack_timeout(req_msg);
1051                 alt_path->packet_life_time -= (alt_path->packet_life_time > 0);
1052         }
1053 }
1054
1055 static void cm_format_req_event(struct cm_work *work,
1056                                 struct cm_id_private *cm_id_priv,
1057                                 struct ib_cm_id *listen_id)
1058 {
1059         struct cm_req_msg *req_msg;
1060         struct ib_cm_req_event_param *param;
1061
1062         req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1063         param = &work->cm_event.param.req_rcvd;
1064         param->listen_id = listen_id;
1065         param->port = cm_id_priv->av.port->port_num;
1066         param->primary_path = &work->path[0];
1067         if (req_msg->alt_local_lid)
1068                 param->alternate_path = &work->path[1];
1069         else
1070                 param->alternate_path = NULL;
1071         param->remote_ca_guid = req_msg->local_ca_guid;
1072         param->remote_qkey = be32_to_cpu(req_msg->local_qkey);
1073         param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg));
1074         param->qp_type = cm_req_get_qp_type(req_msg);
1075         param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg));
1076         param->responder_resources = cm_req_get_init_depth(req_msg);
1077         param->initiator_depth = cm_req_get_resp_res(req_msg);
1078         param->local_cm_response_timeout =
1079                                         cm_req_get_remote_resp_timeout(req_msg);
1080         param->flow_control = cm_req_get_flow_ctrl(req_msg);
1081         param->remote_cm_response_timeout =
1082                                         cm_req_get_local_resp_timeout(req_msg);
1083         param->retry_count = cm_req_get_retry_count(req_msg);
1084         param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1085         param->srq = cm_req_get_srq(req_msg);
1086         work->cm_event.private_data = &req_msg->private_data;
1087 }
1088
1089 static void cm_process_work(struct cm_id_private *cm_id_priv,
1090                             struct cm_work *work)
1091 {
1092         unsigned long flags;
1093         int ret;
1094
1095         /* We will typically only have the current event to report. */
1096         ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
1097         cm_free_work(work);
1098
1099         while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) {
1100                 spin_lock_irqsave(&cm_id_priv->lock, flags);
1101                 work = cm_dequeue_work(cm_id_priv);
1102                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1103                 BUG_ON(!work);
1104                 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id,
1105                                                 &work->cm_event);
1106                 cm_free_work(work);
1107         }
1108         cm_deref_id(cm_id_priv);
1109         if (ret)
1110                 ib_destroy_cm_id(&cm_id_priv->id);
1111 }
1112
1113 static void cm_format_mra(struct cm_mra_msg *mra_msg,
1114                           struct cm_id_private *cm_id_priv,
1115                           enum cm_msg_response msg_mraed, u8 service_timeout,
1116                           const void *private_data, u8 private_data_len)
1117 {
1118         cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid);
1119         cm_mra_set_msg_mraed(mra_msg, msg_mraed);
1120         mra_msg->local_comm_id = cm_id_priv->id.local_id;
1121         mra_msg->remote_comm_id = cm_id_priv->id.remote_id;
1122         cm_mra_set_service_timeout(mra_msg, service_timeout);
1123
1124         if (private_data && private_data_len)
1125                 memcpy(mra_msg->private_data, private_data, private_data_len);
1126 }
1127
1128 static void cm_format_rej(struct cm_rej_msg *rej_msg,
1129                           struct cm_id_private *cm_id_priv,
1130                           enum ib_cm_rej_reason reason,
1131                           void *ari,
1132                           u8 ari_length,
1133                           const void *private_data,
1134                           u8 private_data_len)
1135 {
1136         cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid);
1137         rej_msg->remote_comm_id = cm_id_priv->id.remote_id;
1138
1139         switch(cm_id_priv->id.state) {
1140         case IB_CM_REQ_RCVD:
1141                 rej_msg->local_comm_id = 0;
1142                 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1143                 break;
1144         case IB_CM_MRA_REQ_SENT:
1145                 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1146                 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1147                 break;
1148         case IB_CM_REP_RCVD:
1149         case IB_CM_MRA_REP_SENT:
1150                 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1151                 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP);
1152                 break;
1153         default:
1154                 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1155                 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER);
1156                 break;
1157         }
1158
1159         rej_msg->reason = cpu_to_be16(reason);
1160         if (ari && ari_length) {
1161                 cm_rej_set_reject_info_len(rej_msg, ari_length);
1162                 memcpy(rej_msg->ari, ari, ari_length);
1163         }
1164
1165         if (private_data && private_data_len)
1166                 memcpy(rej_msg->private_data, private_data, private_data_len);
1167 }
1168
1169 static void cm_dup_req_handler(struct cm_work *work,
1170                                struct cm_id_private *cm_id_priv)
1171 {
1172         struct ib_mad_send_buf *msg = NULL;
1173         struct ib_send_wr *bad_send_wr;
1174         unsigned long flags;
1175         int ret;
1176
1177         /* Quick state check to discard duplicate REQs. */
1178         if (cm_id_priv->id.state == IB_CM_REQ_RCVD)
1179                 return;
1180
1181         ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1182         if (ret)
1183                 return;
1184
1185         spin_lock_irqsave(&cm_id_priv->lock, flags);
1186         switch (cm_id_priv->id.state) {
1187         case IB_CM_MRA_REQ_SENT:
1188                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1189                               CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout,
1190                               cm_id_priv->private_data,
1191                               cm_id_priv->private_data_len);
1192                 break;
1193         case IB_CM_TIMEWAIT:
1194                 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv,
1195                               IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0);
1196                 break;
1197         default:
1198                 goto unlock;
1199         }
1200         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1201
1202         ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent, &msg->send_wr,
1203                                &bad_send_wr);
1204         if (ret)
1205                 goto free;
1206         return;
1207
1208 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1209 free:   cm_free_msg(msg);
1210 }
1211
1212 static struct cm_id_private * cm_match_req(struct cm_work *work,
1213                                            struct cm_id_private *cm_id_priv)
1214 {
1215         struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv;
1216         struct cm_timewait_info *timewait_info;
1217         struct cm_req_msg *req_msg;
1218         unsigned long flags;
1219
1220         req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1221
1222         /* Check for duplicate REQ and stale connections. */
1223         spin_lock_irqsave(&cm.lock, flags);
1224         timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info);
1225         if (!timewait_info)
1226                 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
1227
1228         if (timewait_info) {
1229                 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
1230                                            timewait_info->work.remote_id);
1231                 spin_unlock_irqrestore(&cm.lock, flags);
1232                 if (cur_cm_id_priv) {
1233                         cm_dup_req_handler(work, cur_cm_id_priv);
1234                         cm_deref_id(cur_cm_id_priv);
1235                 } else
1236                         cm_issue_rej(work->port, work->mad_recv_wc,
1237                                      IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
1238                                      NULL, 0);
1239                 goto error;
1240         }
1241
1242         /* Find matching listen request. */
1243         listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device,
1244                                            req_msg->service_id);
1245         if (!listen_cm_id_priv) {
1246                 spin_unlock_irqrestore(&cm.lock, flags);
1247                 cm_issue_rej(work->port, work->mad_recv_wc,
1248                              IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ,
1249                              NULL, 0);
1250                 goto error;
1251         }
1252         atomic_inc(&listen_cm_id_priv->refcount);
1253         atomic_inc(&cm_id_priv->refcount);
1254         cm_id_priv->id.state = IB_CM_REQ_RCVD;
1255         atomic_inc(&cm_id_priv->work_count);
1256         spin_unlock_irqrestore(&cm.lock, flags);
1257         return listen_cm_id_priv;
1258
1259 error:  cm_cleanup_timewait(cm_id_priv->timewait_info);
1260         return NULL;
1261 }
1262
1263 static int cm_req_handler(struct cm_work *work)
1264 {
1265         struct ib_cm_id *cm_id;
1266         struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
1267         struct cm_req_msg *req_msg;
1268         int ret;
1269
1270         req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1271
1272         cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL);
1273         if (IS_ERR(cm_id))
1274                 return PTR_ERR(cm_id);
1275
1276         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1277         cm_id_priv->id.remote_id = req_msg->local_comm_id;
1278         cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
1279                                 &cm_id_priv->av);
1280         cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1281                                                             id.local_id);
1282         if (IS_ERR(cm_id_priv->timewait_info)) {
1283                 ret = PTR_ERR(cm_id_priv->timewait_info);
1284                 goto error1;
1285         }
1286         cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id;
1287         cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid;
1288         cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg);
1289
1290         listen_cm_id_priv = cm_match_req(work, cm_id_priv);
1291         if (!listen_cm_id_priv) {
1292                 ret = -EINVAL;
1293                 goto error2;
1294         }
1295
1296         cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
1297         cm_id_priv->id.context = listen_cm_id_priv->id.context;
1298         cm_id_priv->id.service_id = req_msg->service_id;
1299         cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL);
1300
1301         cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]);
1302         ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av);
1303         if (ret)
1304                 goto error3;
1305         if (req_msg->alt_local_lid) {
1306                 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av);
1307                 if (ret)
1308                         goto error3;
1309         }
1310         cm_id_priv->tid = req_msg->hdr.tid;
1311         cm_id_priv->timeout_ms = cm_convert_to_ms(
1312                                         cm_req_get_local_resp_timeout(req_msg));
1313         cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg);
1314         cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg);
1315         cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg);
1316         cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg);
1317         cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg);
1318         cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg);
1319         cm_id_priv->local_ack_timeout =
1320                                 cm_req_get_primary_local_ack_timeout(req_msg);
1321         cm_id_priv->retry_count = cm_req_get_retry_count(req_msg);
1322         cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1323
1324         cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
1325         cm_process_work(cm_id_priv, work);
1326         cm_deref_id(listen_cm_id_priv);
1327         return 0;
1328
1329 error3: atomic_dec(&cm_id_priv->refcount);
1330         cm_deref_id(listen_cm_id_priv);
1331         cm_cleanup_timewait(cm_id_priv->timewait_info);
1332 error2: kfree(cm_id_priv->timewait_info);
1333         cm_id_priv->timewait_info = NULL;
1334 error1: ib_destroy_cm_id(&cm_id_priv->id);
1335         return ret;
1336 }
1337
1338 static void cm_format_rep(struct cm_rep_msg *rep_msg,
1339                           struct cm_id_private *cm_id_priv,
1340                           struct ib_cm_rep_param *param)
1341 {
1342         cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid);
1343         rep_msg->local_comm_id = cm_id_priv->id.local_id;
1344         rep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1345         cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num));
1346         cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn));
1347         rep_msg->resp_resources = param->responder_resources;
1348         rep_msg->initiator_depth = param->initiator_depth;
1349         cm_rep_set_target_ack_delay(rep_msg, param->target_ack_delay);
1350         cm_rep_set_failover(rep_msg, param->failover_accepted);
1351         cm_rep_set_flow_ctrl(rep_msg, param->flow_control);
1352         cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count);
1353         cm_rep_set_srq(rep_msg, param->srq);
1354         rep_msg->local_ca_guid = cm_id_priv->av.port->cm_dev->ca_guid;
1355
1356         if (param->private_data && param->private_data_len)
1357                 memcpy(rep_msg->private_data, param->private_data,
1358                        param->private_data_len);
1359 }
1360
1361 int ib_send_cm_rep(struct ib_cm_id *cm_id,
1362                    struct ib_cm_rep_param *param)
1363 {
1364         struct cm_id_private *cm_id_priv;
1365         struct ib_mad_send_buf *msg;
1366         struct cm_rep_msg *rep_msg;
1367         struct ib_send_wr *bad_send_wr;
1368         unsigned long flags;
1369         int ret;
1370
1371         if (param->private_data &&
1372             param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE)
1373                 return -EINVAL;
1374
1375         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1376         spin_lock_irqsave(&cm_id_priv->lock, flags);
1377         if (cm_id->state != IB_CM_REQ_RCVD &&
1378             cm_id->state != IB_CM_MRA_REQ_SENT) {
1379                 ret = -EINVAL;
1380                 goto out;
1381         }
1382
1383         ret = cm_alloc_msg(cm_id_priv, &msg);
1384         if (ret)
1385                 goto out;
1386
1387         rep_msg = (struct cm_rep_msg *) msg->mad;
1388         cm_format_rep(rep_msg, cm_id_priv, param);
1389         msg->send_wr.wr.ud.timeout_ms = cm_id_priv->timeout_ms;
1390         msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;
1391
1392         ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent,
1393                                &msg->send_wr, &bad_send_wr);
1394         if (ret) {
1395                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1396                 cm_free_msg(msg);
1397                 return ret;
1398         }
1399
1400         cm_id->state = IB_CM_REP_SENT;
1401         cm_id_priv->msg = msg;
1402         cm_id_priv->initiator_depth = param->initiator_depth;
1403         cm_id_priv->responder_resources = param->responder_resources;
1404         cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg);
1405         cm_id_priv->local_qpn = cm_rep_get_local_qpn(rep_msg);
1406
1407 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1408         return ret;
1409 }
1410 EXPORT_SYMBOL(ib_send_cm_rep);
1411
1412 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg,
1413                           struct cm_id_private *cm_id_priv,
1414                           const void *private_data,
1415                           u8 private_data_len)
1416 {
1417         cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid);
1418         rtu_msg->local_comm_id = cm_id_priv->id.local_id;
1419         rtu_msg->remote_comm_id = cm_id_priv->id.remote_id;
1420
1421         if (private_data && private_data_len)
1422                 memcpy(rtu_msg->private_data, private_data, private_data_len);
1423 }
1424
1425 int ib_send_cm_rtu(struct ib_cm_id *cm_id,
1426                    const void *private_data,
1427                    u8 private_data_len)
1428 {
1429         struct cm_id_private *cm_id_priv;
1430         struct ib_mad_send_buf *msg;
1431         struct ib_send_wr *bad_send_wr;
1432         unsigned long flags;
1433         void *data;
1434         int ret;
1435
1436         if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE)
1437                 return -EINVAL;
1438
1439         data = cm_copy_private_data(private_data, private_data_len);
1440         if (IS_ERR(data))
1441                 return PTR_ERR(data);
1442
1443         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1444         spin_lock_irqsave(&cm_id_priv->lock, flags);
1445         if (cm_id->state != IB_CM_REP_RCVD &&
1446             cm_id->state != IB_CM_MRA_REP_SENT) {
1447                 ret = -EINVAL;
1448                 goto error;
1449         }
1450
1451         ret = cm_alloc_msg(cm_id_priv, &msg);
1452         if (ret)
1453                 goto error;
1454
1455         cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1456                       private_data, private_data_len);
1457
1458         ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent,
1459                                &msg->send_wr, &bad_send_wr);
1460         if (ret) {
1461                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1462                 cm_free_msg(msg);
1463                 kfree(data);
1464                 return ret;
1465         }
1466
1467         cm_id->state = IB_CM_ESTABLISHED;
1468         cm_set_private_data(cm_id_priv, data, private_data_len);
1469         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1470         return 0;
1471
1472 error:  spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1473         kfree(data);
1474         return ret;
1475 }
1476 EXPORT_SYMBOL(ib_send_cm_rtu);
1477
1478 static void cm_format_rep_event(struct cm_work *work)
1479 {
1480         struct cm_rep_msg *rep_msg;
1481         struct ib_cm_rep_event_param *param;
1482
1483         rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1484         param = &work->cm_event.param.rep_rcvd;
1485         param->remote_ca_guid = rep_msg->local_ca_guid;
1486         param->remote_qkey = be32_to_cpu(rep_msg->local_qkey);
1487         param->remote_qpn = be32_to_cpu(cm_rep_get_local_qpn(rep_msg));
1488         param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg));
1489         param->responder_resources = rep_msg->initiator_depth;
1490         param->initiator_depth = rep_msg->resp_resources;
1491         param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
1492         param->failover_accepted = cm_rep_get_failover(rep_msg);
1493         param->flow_control = cm_rep_get_flow_ctrl(rep_msg);
1494         param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1495         param->srq = cm_rep_get_srq(rep_msg);
1496         work->cm_event.private_data = &rep_msg->private_data;
1497 }
1498
1499 static void cm_dup_rep_handler(struct cm_work *work)
1500 {
1501         struct cm_id_private *cm_id_priv;
1502         struct cm_rep_msg *rep_msg;
1503         struct ib_mad_send_buf *msg = NULL;
1504         struct ib_send_wr *bad_send_wr;
1505         unsigned long flags;
1506         int ret;
1507
1508         rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad;
1509         cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id,
1510                                    rep_msg->local_comm_id);
1511         if (!cm_id_priv)
1512                 return;
1513
1514         ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1515         if (ret)
1516                 goto deref;
1517
1518         spin_lock_irqsave(&cm_id_priv->lock, flags);
1519         if (cm_id_priv->id.state == IB_CM_ESTABLISHED)
1520                 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1521                               cm_id_priv->private_data,
1522                               cm_id_priv->private_data_len);
1523         else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT)
1524                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1525                               CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout,
1526                               cm_id_priv->private_data,
1527                               cm_id_priv->private_data_len);
1528         else
1529                 goto unlock;
1530         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1531
1532         ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent, &msg->send_wr,
1533                                &bad_send_wr);
1534         if (ret)
1535                 goto free;
1536         goto deref;
1537
1538 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1539 free:   cm_free_msg(msg);
1540 deref:  cm_deref_id(cm_id_priv);
1541 }
1542
1543 static int cm_rep_handler(struct cm_work *work)
1544 {
1545         struct cm_id_private *cm_id_priv;
1546         struct cm_rep_msg *rep_msg;
1547         unsigned long flags;
1548         int ret;
1549
1550         rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1551         cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0);
1552         if (!cm_id_priv) {
1553                 cm_dup_rep_handler(work);
1554                 return -EINVAL;
1555         }
1556
1557         cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id;
1558         cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid;
1559         cm_id_priv->timewait_info->remote_qpn = cm_rep_get_local_qpn(rep_msg);
1560
1561         spin_lock_irqsave(&cm.lock, flags);
1562         /* Check for duplicate REP. */
1563         if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
1564                 spin_unlock_irqrestore(&cm.lock, flags);
1565                 ret = -EINVAL;
1566                 goto error;
1567         }
1568         /* Check for a stale connection. */
1569         if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) {
1570                 spin_unlock_irqrestore(&cm.lock, flags);
1571                 cm_issue_rej(work->port, work->mad_recv_wc,
1572                              IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP,
1573                              NULL, 0);
1574                 ret = -EINVAL;
1575                 goto error;
1576         }
1577         spin_unlock_irqrestore(&cm.lock, flags);
1578
1579         cm_format_rep_event(work);
1580
1581         spin_lock_irqsave(&cm_id_priv->lock, flags);
1582         switch (cm_id_priv->id.state) {
1583         case IB_CM_REQ_SENT:
1584         case IB_CM_MRA_REQ_RCVD:
1585                 break;
1586         default:
1587                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1588                 ret = -EINVAL;
1589                 goto error;
1590         }
1591         cm_id_priv->id.state = IB_CM_REP_RCVD;
1592         cm_id_priv->id.remote_id = rep_msg->local_comm_id;
1593         cm_id_priv->remote_qpn = cm_rep_get_local_qpn(rep_msg);
1594         cm_id_priv->initiator_depth = rep_msg->resp_resources;
1595         cm_id_priv->responder_resources = rep_msg->initiator_depth;
1596         cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg);
1597         cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1598
1599         /* todo: handle peer_to_peer */
1600
1601         ib_cancel_mad(cm_id_priv->av.port->mad_agent,
1602                       (unsigned long) cm_id_priv->msg);
1603         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1604         if (!ret)
1605                 list_add_tail(&work->list, &cm_id_priv->work_list);
1606         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1607
1608         if (ret)
1609                 cm_process_work(cm_id_priv, work);
1610         else
1611                 cm_deref_id(cm_id_priv);
1612         return 0;
1613
1614 error:  cm_cleanup_timewait(cm_id_priv->timewait_info);
1615         cm_deref_id(cm_id_priv);
1616         return ret;
1617 }
1618
1619 static int cm_establish_handler(struct cm_work *work)
1620 {
1621         struct cm_id_private *cm_id_priv;
1622         unsigned long flags;
1623         int ret;
1624
1625         /* See comment in ib_cm_establish about lookup. */
1626         cm_id_priv = cm_acquire_id(work->local_id, work->remote_id);
1627         if (!cm_id_priv)
1628                 return -EINVAL;
1629
1630         spin_lock_irqsave(&cm_id_priv->lock, flags);
1631         if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
1632                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1633                 goto out;
1634         }
1635
1636         ib_cancel_mad(cm_id_priv->av.port->mad_agent,
1637                       (unsigned long) cm_id_priv->msg);
1638         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1639         if (!ret)
1640                 list_add_tail(&work->list, &cm_id_priv->work_list);
1641         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1642
1643         if (ret)
1644                 cm_process_work(cm_id_priv, work);
1645         else
1646                 cm_deref_id(cm_id_priv);
1647         return 0;
1648 out:
1649         cm_deref_id(cm_id_priv);
1650         return -EINVAL;
1651 }
1652
1653 static int cm_rtu_handler(struct cm_work *work)
1654 {
1655         struct cm_id_private *cm_id_priv;
1656         struct cm_rtu_msg *rtu_msg;
1657         unsigned long flags;
1658         int ret;
1659
1660         rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad;
1661         cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id,
1662                                    rtu_msg->local_comm_id);
1663         if (!cm_id_priv)
1664                 return -EINVAL;
1665
1666         work->cm_event.private_data = &rtu_msg->private_data;
1667
1668         spin_lock_irqsave(&cm_id_priv->lock, flags);
1669         if (cm_id_priv->id.state != IB_CM_REP_SENT &&
1670             cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
1671                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1672                 goto out;
1673         }
1674         cm_id_priv->id.state = IB_CM_ESTABLISHED;
1675
1676         ib_cancel_mad(cm_id_priv->av.port->mad_agent,
1677                       (unsigned long) cm_id_priv->msg);
1678         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1679         if (!ret)
1680                 list_add_tail(&work->list, &cm_id_priv->work_list);
1681         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1682
1683         if (ret)
1684                 cm_process_work(cm_id_priv, work);
1685         else
1686                 cm_deref_id(cm_id_priv);
1687         return 0;
1688 out:
1689         cm_deref_id(cm_id_priv);
1690         return -EINVAL;
1691 }
1692
1693 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg,
1694                           struct cm_id_private *cm_id_priv,
1695                           const void *private_data,
1696                           u8 private_data_len)
1697 {
1698         cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID,
1699                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ));
1700         dreq_msg->local_comm_id = cm_id_priv->id.local_id;
1701         dreq_msg->remote_comm_id = cm_id_priv->id.remote_id;
1702         cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn);
1703
1704         if (private_data && private_data_len)
1705                 memcpy(dreq_msg->private_data, private_data, private_data_len);
1706 }
1707
1708 int ib_send_cm_dreq(struct ib_cm_id *cm_id,
1709                     const void *private_data,
1710                     u8 private_data_len)
1711 {
1712         struct cm_id_private *cm_id_priv;
1713         struct ib_mad_send_buf *msg;
1714         struct ib_send_wr *bad_send_wr;
1715         unsigned long flags;
1716         int ret;
1717
1718         if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE)
1719                 return -EINVAL;
1720
1721         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1722         spin_lock_irqsave(&cm_id_priv->lock, flags);
1723         if (cm_id->state != IB_CM_ESTABLISHED) {
1724                 ret = -EINVAL;
1725                 goto out;
1726         }
1727
1728         ret = cm_alloc_msg(cm_id_priv, &msg);
1729         if (ret) {
1730                 cm_enter_timewait(cm_id_priv);
1731                 goto out;
1732         }
1733
1734         cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv,
1735                        private_data, private_data_len);
1736         msg->send_wr.wr.ud.timeout_ms = cm_id_priv->timeout_ms;
1737         msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
1738
1739         ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent,
1740                                &msg->send_wr, &bad_send_wr);
1741         if (ret) {
1742                 cm_enter_timewait(cm_id_priv);
1743                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1744                 cm_free_msg(msg);
1745                 return ret;
1746         }
1747
1748         cm_id->state = IB_CM_DREQ_SENT;
1749         cm_id_priv->msg = msg;
1750 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1751         return ret;
1752 }
1753 EXPORT_SYMBOL(ib_send_cm_dreq);
1754
1755 static void cm_format_drep(struct cm_drep_msg *drep_msg,
1756                           struct cm_id_private *cm_id_priv,
1757                           const void *private_data,
1758                           u8 private_data_len)
1759 {
1760         cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid);
1761         drep_msg->local_comm_id = cm_id_priv->id.local_id;
1762         drep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1763
1764         if (private_data && private_data_len)
1765                 memcpy(drep_msg->private_data, private_data, private_data_len);
1766 }
1767
1768 int ib_send_cm_drep(struct ib_cm_id *cm_id,
1769                     const void *private_data,
1770                     u8 private_data_len)
1771 {
1772         struct cm_id_private *cm_id_priv;
1773         struct ib_mad_send_buf *msg;
1774         struct ib_send_wr *bad_send_wr;
1775         unsigned long flags;
1776         void *data;
1777         int ret;
1778
1779         if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
1780                 return -EINVAL;
1781
1782         data = cm_copy_private_data(private_data, private_data_len);
1783         if (IS_ERR(data))
1784                 return PTR_ERR(data);
1785
1786         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1787         spin_lock_irqsave(&cm_id_priv->lock, flags);
1788         if (cm_id->state != IB_CM_DREQ_RCVD) {
1789                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1790                 kfree(data);
1791                 return -EINVAL;
1792         }
1793
1794         cm_set_private_data(cm_id_priv, data, private_data_len);
1795         cm_enter_timewait(cm_id_priv);
1796
1797         ret = cm_alloc_msg(cm_id_priv, &msg);
1798         if (ret)
1799                 goto out;
1800
1801         cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
1802                        private_data, private_data_len);
1803
1804         ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent, &msg->send_wr,
1805                                &bad_send_wr);
1806         if (ret) {
1807                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1808                 cm_free_msg(msg);
1809                 return ret;
1810         }
1811
1812 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1813         return ret;
1814 }
1815 EXPORT_SYMBOL(ib_send_cm_drep);
1816
1817 static int cm_dreq_handler(struct cm_work *work)
1818 {
1819         struct cm_id_private *cm_id_priv;
1820         struct cm_dreq_msg *dreq_msg;
1821         struct ib_mad_send_buf *msg = NULL;
1822         struct ib_send_wr *bad_send_wr;
1823         unsigned long flags;
1824         int ret;
1825
1826         dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
1827         cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id,
1828                                    dreq_msg->local_comm_id);
1829         if (!cm_id_priv)
1830                 return -EINVAL;
1831
1832         work->cm_event.private_data = &dreq_msg->private_data;
1833
1834         spin_lock_irqsave(&cm_id_priv->lock, flags);
1835         if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg))
1836                 goto unlock;
1837
1838         switch (cm_id_priv->id.state) {
1839         case IB_CM_REP_SENT:
1840         case IB_CM_DREQ_SENT:
1841                 ib_cancel_mad(cm_id_priv->av.port->mad_agent,
1842                               (unsigned long) cm_id_priv->msg);
1843                 break;
1844         case IB_CM_ESTABLISHED:
1845         case IB_CM_MRA_REP_RCVD:
1846                 break;
1847         case IB_CM_TIMEWAIT:
1848                 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
1849                         goto unlock;
1850
1851                 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
1852                                cm_id_priv->private_data,
1853                                cm_id_priv->private_data_len);
1854                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1855
1856                 if (ib_post_send_mad(cm_id_priv->av.port->mad_agent,
1857                                      &msg->send_wr, &bad_send_wr))
1858                         cm_free_msg(msg);
1859                 goto deref;
1860         default:
1861                 goto unlock;
1862         }
1863         cm_id_priv->id.state = IB_CM_DREQ_RCVD;
1864         cm_id_priv->tid = dreq_msg->hdr.tid;
1865         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1866         if (!ret)
1867                 list_add_tail(&work->list, &cm_id_priv->work_list);
1868         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1869
1870         if (ret)
1871                 cm_process_work(cm_id_priv, work);
1872         else
1873                 cm_deref_id(cm_id_priv);
1874         return 0;
1875
1876 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1877 deref:  cm_deref_id(cm_id_priv);
1878         return -EINVAL;
1879 }
1880
1881 static int cm_drep_handler(struct cm_work *work)
1882 {
1883         struct cm_id_private *cm_id_priv;
1884         struct cm_drep_msg *drep_msg;
1885         unsigned long flags;
1886         int ret;
1887
1888         drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
1889         cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id,
1890                                    drep_msg->local_comm_id);
1891         if (!cm_id_priv)
1892                 return -EINVAL;
1893
1894         work->cm_event.private_data = &drep_msg->private_data;
1895
1896         spin_lock_irqsave(&cm_id_priv->lock, flags);
1897         if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
1898             cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
1899                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1900                 goto out;
1901         }
1902         cm_enter_timewait(cm_id_priv);
1903
1904         ib_cancel_mad(cm_id_priv->av.port->mad_agent,
1905                       (unsigned long) cm_id_priv->msg);
1906         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1907         if (!ret)
1908                 list_add_tail(&work->list, &cm_id_priv->work_list);
1909         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1910
1911         if (ret)
1912                 cm_process_work(cm_id_priv, work);
1913         else
1914                 cm_deref_id(cm_id_priv);
1915         return 0;
1916 out:
1917         cm_deref_id(cm_id_priv);
1918         return -EINVAL;
1919 }
1920
1921 int ib_send_cm_rej(struct ib_cm_id *cm_id,
1922                    enum ib_cm_rej_reason reason,
1923                    void *ari,
1924                    u8 ari_length,
1925                    const void *private_data,
1926                    u8 private_data_len)
1927 {
1928         struct cm_id_private *cm_id_priv;
1929         struct ib_mad_send_buf *msg;
1930         struct ib_send_wr *bad_send_wr;
1931         unsigned long flags;
1932         int ret;
1933
1934         if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
1935             (ari && ari_length > IB_CM_REJ_ARI_LENGTH))
1936                 return -EINVAL;
1937
1938         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1939
1940         spin_lock_irqsave(&cm_id_priv->lock, flags);
1941         switch (cm_id->state) {
1942         case IB_CM_REQ_SENT:
1943         case IB_CM_MRA_REQ_RCVD:
1944         case IB_CM_REQ_RCVD:
1945         case IB_CM_MRA_REQ_SENT:
1946         case IB_CM_REP_RCVD:
1947         case IB_CM_MRA_REP_SENT:
1948                 ret = cm_alloc_msg(cm_id_priv, &msg);
1949                 if (!ret)
1950                         cm_format_rej((struct cm_rej_msg *) msg->mad,
1951                                       cm_id_priv, reason, ari, ari_length,
1952                                       private_data, private_data_len);
1953
1954                 cm_reset_to_idle(cm_id_priv);
1955                 break;
1956         case IB_CM_REP_SENT:
1957         case IB_CM_MRA_REP_RCVD:
1958                 ret = cm_alloc_msg(cm_id_priv, &msg);
1959                 if (!ret)
1960                         cm_format_rej((struct cm_rej_msg *) msg->mad,
1961                                       cm_id_priv, reason, ari, ari_length,
1962                                       private_data, private_data_len);
1963
1964                 cm_enter_timewait(cm_id_priv);
1965                 break;
1966         default:
1967                 ret = -EINVAL;
1968                 goto out;
1969         }
1970
1971         if (ret)
1972                 goto out;
1973
1974         ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent,
1975                                &msg->send_wr, &bad_send_wr);
1976         if (ret)
1977                 cm_free_msg(msg);
1978
1979 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1980         return ret;
1981 }
1982 EXPORT_SYMBOL(ib_send_cm_rej);
1983
1984 static void cm_format_rej_event(struct cm_work *work)
1985 {
1986         struct cm_rej_msg *rej_msg;
1987         struct ib_cm_rej_event_param *param;
1988
1989         rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
1990         param = &work->cm_event.param.rej_rcvd;
1991         param->ari = rej_msg->ari;
1992         param->ari_length = cm_rej_get_reject_info_len(rej_msg);
1993         param->reason = __be16_to_cpu(rej_msg->reason);
1994         work->cm_event.private_data = &rej_msg->private_data;
1995 }
1996
1997 static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
1998 {
1999         struct cm_timewait_info *timewait_info;
2000         struct cm_id_private *cm_id_priv;
2001         unsigned long flags;
2002         __be32 remote_id;
2003
2004         remote_id = rej_msg->local_comm_id;
2005
2006         if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) {
2007                 spin_lock_irqsave(&cm.lock, flags);
2008                 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari),
2009                                                   remote_id);
2010                 if (!timewait_info) {
2011                         spin_unlock_irqrestore(&cm.lock, flags);
2012                         return NULL;
2013                 }
2014                 cm_id_priv = idr_find(&cm.local_id_table,
2015                                       (__force int) timewait_info->work.local_id);
2016                 if (cm_id_priv) {
2017                         if (cm_id_priv->id.remote_id == remote_id)
2018                                 atomic_inc(&cm_id_priv->refcount);
2019                         else
2020                                 cm_id_priv = NULL;
2021                 }
2022                 spin_unlock_irqrestore(&cm.lock, flags);
2023         } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ)
2024                 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0);
2025         else
2026                 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id);
2027
2028         return cm_id_priv;
2029 }
2030
2031 static int cm_rej_handler(struct cm_work *work)
2032 {
2033         struct cm_id_private *cm_id_priv;
2034         struct cm_rej_msg *rej_msg;
2035         unsigned long flags;
2036         int ret;
2037
2038         rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2039         cm_id_priv = cm_acquire_rejected_id(rej_msg);
2040         if (!cm_id_priv)
2041                 return -EINVAL;
2042
2043         cm_format_rej_event(work);
2044
2045         spin_lock_irqsave(&cm_id_priv->lock, flags);
2046         switch (cm_id_priv->id.state) {
2047         case IB_CM_REQ_SENT:
2048         case IB_CM_MRA_REQ_RCVD:
2049         case IB_CM_REP_SENT:
2050         case IB_CM_MRA_REP_RCVD:
2051                 ib_cancel_mad(cm_id_priv->av.port->mad_agent,
2052                               (unsigned long) cm_id_priv->msg);
2053                 /* fall through */
2054         case IB_CM_REQ_RCVD:
2055         case IB_CM_MRA_REQ_SENT:
2056                 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN)
2057                         cm_enter_timewait(cm_id_priv);
2058                 else
2059                         cm_reset_to_idle(cm_id_priv);
2060                 break;
2061         case IB_CM_DREQ_SENT:
2062                 ib_cancel_mad(cm_id_priv->av.port->mad_agent,
2063                               (unsigned long) cm_id_priv->msg);
2064                 /* fall through */
2065         case IB_CM_REP_RCVD:
2066         case IB_CM_MRA_REP_SENT:
2067         case IB_CM_ESTABLISHED:
2068                 cm_enter_timewait(cm_id_priv);
2069                 break;
2070         default:
2071                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2072                 ret = -EINVAL;
2073                 goto out;
2074         }
2075
2076         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2077         if (!ret)
2078                 list_add_tail(&work->list, &cm_id_priv->work_list);
2079         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2080
2081         if (ret)
2082                 cm_process_work(cm_id_priv, work);
2083         else
2084                 cm_deref_id(cm_id_priv);
2085         return 0;
2086 out:
2087         cm_deref_id(cm_id_priv);
2088         return -EINVAL;
2089 }
2090
2091 int ib_send_cm_mra(struct ib_cm_id *cm_id,
2092                    u8 service_timeout,
2093                    const void *private_data,
2094                    u8 private_data_len)
2095 {
2096         struct cm_id_private *cm_id_priv;
2097         struct ib_mad_send_buf *msg;
2098         struct ib_send_wr *bad_send_wr;
2099         void *data;
2100         unsigned long flags;
2101         int ret;
2102
2103         if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE)
2104                 return -EINVAL;
2105
2106         data = cm_copy_private_data(private_data, private_data_len);
2107         if (IS_ERR(data))
2108                 return PTR_ERR(data);
2109
2110         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2111
2112         spin_lock_irqsave(&cm_id_priv->lock, flags);
2113         switch(cm_id_priv->id.state) {
2114         case IB_CM_REQ_RCVD:
2115                 ret = cm_alloc_msg(cm_id_priv, &msg);
2116                 if (ret)
2117                         goto error1;
2118
2119                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2120                               CM_MSG_RESPONSE_REQ, service_timeout,
2121                               private_data, private_data_len);
2122                 ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent,
2123                                        &msg->send_wr, &bad_send_wr);
2124                 if (ret)
2125                         goto error2;
2126                 cm_id->state = IB_CM_MRA_REQ_SENT;
2127                 break;
2128         case IB_CM_REP_RCVD:
2129                 ret = cm_alloc_msg(cm_id_priv, &msg);
2130                 if (ret)
2131                         goto error1;
2132
2133                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2134                               CM_MSG_RESPONSE_REP, service_timeout,
2135                               private_data, private_data_len);
2136                 ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent,
2137                                        &msg->send_wr, &bad_send_wr);
2138                 if (ret)
2139                         goto error2;
2140                 cm_id->state = IB_CM_MRA_REP_SENT;
2141                 break;
2142         case IB_CM_ESTABLISHED:
2143                 ret = cm_alloc_msg(cm_id_priv, &msg);
2144                 if (ret)
2145                         goto error1;
2146
2147                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2148                               CM_MSG_RESPONSE_OTHER, service_timeout,
2149                               private_data, private_data_len);
2150                 ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent,
2151                                        &msg->send_wr, &bad_send_wr);
2152                 if (ret)
2153                         goto error2;
2154                 cm_id->lap_state = IB_CM_MRA_LAP_SENT;
2155                 break;
2156         default:
2157                 ret = -EINVAL;
2158                 goto error1;
2159         }
2160         cm_id_priv->service_timeout = service_timeout;
2161         cm_set_private_data(cm_id_priv, data, private_data_len);
2162         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2163         return 0;
2164
2165 error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2166         kfree(data);
2167         return ret;
2168
2169 error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2170         kfree(data);
2171         cm_free_msg(msg);
2172         return ret;
2173 }
2174 EXPORT_SYMBOL(ib_send_cm_mra);
2175
2176 static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
2177 {
2178         switch (cm_mra_get_msg_mraed(mra_msg)) {
2179         case CM_MSG_RESPONSE_REQ:
2180                 return cm_acquire_id(mra_msg->remote_comm_id, 0);
2181         case CM_MSG_RESPONSE_REP:
2182         case CM_MSG_RESPONSE_OTHER:
2183                 return cm_acquire_id(mra_msg->remote_comm_id,
2184                                      mra_msg->local_comm_id);
2185         default:
2186                 return NULL;
2187         }
2188 }
2189
2190 static int cm_mra_handler(struct cm_work *work)
2191 {
2192         struct cm_id_private *cm_id_priv;
2193         struct cm_mra_msg *mra_msg;
2194         unsigned long flags;
2195         int timeout, ret;
2196
2197         mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
2198         cm_id_priv = cm_acquire_mraed_id(mra_msg);
2199         if (!cm_id_priv)
2200                 return -EINVAL;
2201
2202         work->cm_event.private_data = &mra_msg->private_data;
2203         work->cm_event.param.mra_rcvd.service_timeout =
2204                                         cm_mra_get_service_timeout(mra_msg);
2205         timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) +
2206                   cm_convert_to_ms(cm_id_priv->av.packet_life_time);
2207
2208         spin_lock_irqsave(&cm_id_priv->lock, flags);
2209         switch (cm_id_priv->id.state) {
2210         case IB_CM_REQ_SENT:
2211                 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ ||
2212                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
2213                                   (unsigned long) cm_id_priv->msg, timeout))
2214                         goto out;
2215                 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
2216                 break;
2217         case IB_CM_REP_SENT:
2218                 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP ||
2219                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
2220                                   (unsigned long) cm_id_priv->msg, timeout))
2221                         goto out;
2222                 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
2223                 break;
2224         case IB_CM_ESTABLISHED:
2225                 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER ||
2226                     cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
2227                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
2228                                   (unsigned long) cm_id_priv->msg, timeout))
2229                         goto out;
2230                 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
2231                 break;
2232         default:
2233                 goto out;
2234         }
2235
2236         cm_id_priv->msg->context[1] = (void *) (unsigned long)
2237                                       cm_id_priv->id.state;
2238         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2239         if (!ret)
2240                 list_add_tail(&work->list, &cm_id_priv->work_list);
2241         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2242
2243         if (ret)
2244                 cm_process_work(cm_id_priv, work);
2245         else
2246                 cm_deref_id(cm_id_priv);
2247         return 0;
2248 out:
2249         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2250         cm_deref_id(cm_id_priv);
2251         return -EINVAL;
2252 }
2253
2254 static void cm_format_lap(struct cm_lap_msg *lap_msg,
2255                           struct cm_id_private *cm_id_priv,
2256                           struct ib_sa_path_rec *alternate_path,
2257                           const void *private_data,
2258                           u8 private_data_len)
2259 {
2260         cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID,
2261                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP));
2262         lap_msg->local_comm_id = cm_id_priv->id.local_id;
2263         lap_msg->remote_comm_id = cm_id_priv->id.remote_id;
2264         cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn);
2265         /* todo: need remote CM response timeout */
2266         cm_lap_set_remote_resp_timeout(lap_msg, 0x1F);
2267         lap_msg->alt_local_lid = alternate_path->slid;
2268         lap_msg->alt_remote_lid = alternate_path->dlid;
2269         lap_msg->alt_local_gid = alternate_path->sgid;
2270         lap_msg->alt_remote_gid = alternate_path->dgid;
2271         cm_lap_set_flow_label(lap_msg, alternate_path->flow_label);
2272         cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class);
2273         lap_msg->alt_hop_limit = alternate_path->hop_limit;
2274         cm_lap_set_packet_rate(lap_msg, alternate_path->rate);
2275         cm_lap_set_sl(lap_msg, alternate_path->sl);
2276         cm_lap_set_subnet_local(lap_msg, 1); /* local only... */
2277         cm_lap_set_local_ack_timeout(lap_msg,
2278                 min(31, alternate_path->packet_life_time + 1));
2279
2280         if (private_data && private_data_len)
2281                 memcpy(lap_msg->private_data, private_data, private_data_len);
2282 }
2283
2284 int ib_send_cm_lap(struct ib_cm_id *cm_id,
2285                    struct ib_sa_path_rec *alternate_path,
2286                    const void *private_data,
2287                    u8 private_data_len)
2288 {
2289         struct cm_id_private *cm_id_priv;
2290         struct ib_mad_send_buf *msg;
2291         struct ib_send_wr *bad_send_wr;
2292         unsigned long flags;
2293         int ret;
2294
2295         if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE)
2296                 return -EINVAL;
2297
2298         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2299         spin_lock_irqsave(&cm_id_priv->lock, flags);
2300         if (cm_id->state != IB_CM_ESTABLISHED ||
2301             cm_id->lap_state != IB_CM_LAP_IDLE) {
2302                 ret = -EINVAL;
2303                 goto out;
2304         }
2305
2306         ret = cm_alloc_msg(cm_id_priv, &msg);
2307         if (ret)
2308                 goto out;
2309
2310         cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv,
2311                       alternate_path, private_data, private_data_len);
2312         msg->send_wr.wr.ud.timeout_ms = cm_id_priv->timeout_ms;
2313         msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED;
2314
2315         ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent,
2316                                &msg->send_wr, &bad_send_wr);
2317         if (ret) {
2318                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2319                 cm_free_msg(msg);
2320                 return ret;
2321         }
2322
2323         cm_id->lap_state = IB_CM_LAP_SENT;
2324         cm_id_priv->msg = msg;
2325
2326 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2327         return ret;
2328 }
2329 EXPORT_SYMBOL(ib_send_cm_lap);
2330
2331 static void cm_format_path_from_lap(struct ib_sa_path_rec *path,
2332                                     struct cm_lap_msg *lap_msg)
2333 {
2334         memset(path, 0, sizeof *path);
2335         path->dgid = lap_msg->alt_local_gid;
2336         path->sgid = lap_msg->alt_remote_gid;
2337         path->dlid = lap_msg->alt_local_lid;
2338         path->slid = lap_msg->alt_remote_lid;
2339         path->flow_label = cm_lap_get_flow_label(lap_msg);
2340         path->hop_limit = lap_msg->alt_hop_limit;
2341         path->traffic_class = cm_lap_get_traffic_class(lap_msg);
2342         path->reversible = 1;
2343         /* pkey is same as in REQ */
2344         path->sl = cm_lap_get_sl(lap_msg);
2345         path->mtu_selector = IB_SA_EQ;
2346         /* mtu is same as in REQ */
2347         path->rate_selector = IB_SA_EQ;
2348         path->rate = cm_lap_get_packet_rate(lap_msg);
2349         path->packet_life_time_selector = IB_SA_EQ;
2350         path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg);
2351         path->packet_life_time -= (path->packet_life_time > 0);
2352 }
2353
2354 static int cm_lap_handler(struct cm_work *work)
2355 {
2356         struct cm_id_private *cm_id_priv;
2357         struct cm_lap_msg *lap_msg;
2358         struct ib_cm_lap_event_param *param;
2359         struct ib_mad_send_buf *msg = NULL;
2360         struct ib_send_wr *bad_send_wr;
2361         unsigned long flags;
2362         int ret;
2363
2364         /* todo: verify LAP request and send reject APR if invalid. */
2365         lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
2366         cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id,
2367                                    lap_msg->local_comm_id);
2368         if (!cm_id_priv)
2369                 return -EINVAL;
2370
2371         param = &work->cm_event.param.lap_rcvd;
2372         param->alternate_path = &work->path[0];
2373         cm_format_path_from_lap(param->alternate_path, lap_msg);
2374         work->cm_event.private_data = &lap_msg->private_data;
2375
2376         spin_lock_irqsave(&cm_id_priv->lock, flags);
2377         if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
2378                 goto unlock;
2379
2380         switch (cm_id_priv->id.lap_state) {
2381         case IB_CM_LAP_IDLE:
2382                 break;
2383         case IB_CM_MRA_LAP_SENT:
2384                 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2385                         goto unlock;
2386
2387                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2388                               CM_MSG_RESPONSE_OTHER,
2389                               cm_id_priv->service_timeout,
2390                               cm_id_priv->private_data,
2391                               cm_id_priv->private_data_len);
2392                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2393
2394                 if (ib_post_send_mad(cm_id_priv->av.port->mad_agent,
2395                                      &msg->send_wr, &bad_send_wr))
2396                         cm_free_msg(msg);
2397                 goto deref;
2398         default:
2399                 goto unlock;
2400         }
2401
2402         cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
2403         cm_id_priv->tid = lap_msg->hdr.tid;
2404         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2405         if (!ret)
2406                 list_add_tail(&work->list, &cm_id_priv->work_list);
2407         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2408
2409         if (ret)
2410                 cm_process_work(cm_id_priv, work);
2411         else
2412                 cm_deref_id(cm_id_priv);
2413         return 0;
2414
2415 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2416 deref:  cm_deref_id(cm_id_priv);
2417         return -EINVAL;
2418 }
2419
2420 static void cm_format_apr(struct cm_apr_msg *apr_msg,
2421                           struct cm_id_private *cm_id_priv,
2422                           enum ib_cm_apr_status status,
2423                           void *info,
2424                           u8 info_length,
2425                           const void *private_data,
2426                           u8 private_data_len)
2427 {
2428         cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid);
2429         apr_msg->local_comm_id = cm_id_priv->id.local_id;
2430         apr_msg->remote_comm_id = cm_id_priv->id.remote_id;
2431         apr_msg->ap_status = (u8) status;
2432
2433         if (info && info_length) {
2434                 apr_msg->info_length = info_length;
2435                 memcpy(apr_msg->info, info, info_length);
2436         }
2437
2438         if (private_data && private_data_len)
2439                 memcpy(apr_msg->private_data, private_data, private_data_len);
2440 }
2441
2442 int ib_send_cm_apr(struct ib_cm_id *cm_id,
2443                    enum ib_cm_apr_status status,
2444                    void *info,
2445                    u8 info_length,
2446                    const void *private_data,
2447                    u8 private_data_len)
2448 {
2449         struct cm_id_private *cm_id_priv;
2450         struct ib_mad_send_buf *msg;
2451         struct ib_send_wr *bad_send_wr;
2452         unsigned long flags;
2453         int ret;
2454
2455         if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) ||
2456             (info && info_length > IB_CM_APR_INFO_LENGTH))
2457                 return -EINVAL;
2458
2459         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2460         spin_lock_irqsave(&cm_id_priv->lock, flags);
2461         if (cm_id->state != IB_CM_ESTABLISHED ||
2462             (cm_id->lap_state != IB_CM_LAP_RCVD &&
2463              cm_id->lap_state != IB_CM_MRA_LAP_SENT)) {
2464                 ret = -EINVAL;
2465                 goto out;
2466         }
2467
2468         ret = cm_alloc_msg(cm_id_priv, &msg);
2469         if (ret)
2470                 goto out;
2471
2472         cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status,
2473                       info, info_length, private_data, private_data_len);
2474         ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent,
2475                                &msg->send_wr, &bad_send_wr);
2476         if (ret) {
2477                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2478                 cm_free_msg(msg);
2479                 return ret;
2480         }
2481
2482         cm_id->lap_state = IB_CM_LAP_IDLE;
2483 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2484         return ret;
2485 }
2486 EXPORT_SYMBOL(ib_send_cm_apr);
2487
2488 static int cm_apr_handler(struct cm_work *work)
2489 {
2490         struct cm_id_private *cm_id_priv;
2491         struct cm_apr_msg *apr_msg;
2492         unsigned long flags;
2493         int ret;
2494
2495         apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
2496         cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id,
2497                                    apr_msg->local_comm_id);
2498         if (!cm_id_priv)
2499                 return -EINVAL; /* Unmatched reply. */
2500
2501         work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status;
2502         work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info;
2503         work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length;
2504         work->cm_event.private_data = &apr_msg->private_data;
2505
2506         spin_lock_irqsave(&cm_id_priv->lock, flags);
2507         if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
2508             (cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
2509              cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
2510                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2511                 goto out;
2512         }
2513         cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
2514         ib_cancel_mad(cm_id_priv->av.port->mad_agent,
2515                       (unsigned long) cm_id_priv->msg);
2516         cm_id_priv->msg = NULL;
2517
2518         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2519         if (!ret)
2520                 list_add_tail(&work->list, &cm_id_priv->work_list);
2521         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2522
2523         if (ret)
2524                 cm_process_work(cm_id_priv, work);
2525         else
2526                 cm_deref_id(cm_id_priv);
2527         return 0;
2528 out:
2529         cm_deref_id(cm_id_priv);
2530         return -EINVAL;
2531 }
2532
2533 static int cm_timewait_handler(struct cm_work *work)
2534 {
2535         struct cm_timewait_info *timewait_info;
2536         struct cm_id_private *cm_id_priv;
2537         unsigned long flags;
2538         int ret;
2539
2540         timewait_info = (struct cm_timewait_info *)work;
2541         cm_cleanup_timewait(timewait_info);
2542
2543         cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
2544                                    timewait_info->work.remote_id);
2545         if (!cm_id_priv)
2546                 return -EINVAL;
2547
2548         spin_lock_irqsave(&cm_id_priv->lock, flags);
2549         if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
2550             cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
2551                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2552                 goto out;
2553         }
2554         cm_id_priv->id.state = IB_CM_IDLE;
2555         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2556         if (!ret)
2557                 list_add_tail(&work->list, &cm_id_priv->work_list);
2558         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2559
2560         if (ret)
2561                 cm_process_work(cm_id_priv, work);
2562         else
2563                 cm_deref_id(cm_id_priv);
2564         return 0;
2565 out:
2566         cm_deref_id(cm_id_priv);
2567         return -EINVAL;
2568 }
2569
2570 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
2571                                struct cm_id_private *cm_id_priv,
2572                                struct ib_cm_sidr_req_param *param)
2573 {
2574         cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
2575                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR));
2576         sidr_req_msg->request_id = cm_id_priv->id.local_id;
2577         sidr_req_msg->pkey = cpu_to_be16(param->pkey);
2578         sidr_req_msg->service_id = param->service_id;
2579
2580         if (param->private_data && param->private_data_len)
2581                 memcpy(sidr_req_msg->private_data, param->private_data,
2582                        param->private_data_len);
2583 }
2584
2585 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
2586                         struct ib_cm_sidr_req_param *param)
2587 {
2588         struct cm_id_private *cm_id_priv;
2589         struct ib_mad_send_buf *msg;
2590         struct ib_send_wr *bad_send_wr;
2591         unsigned long flags;
2592         int ret;
2593
2594         if (!param->path || (param->private_data &&
2595              param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
2596                 return -EINVAL;
2597
2598         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2599         ret = cm_init_av_by_path(param->path, &cm_id_priv->av);
2600         if (ret)
2601                 goto out;
2602
2603         cm_id->service_id = param->service_id;
2604         cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
2605         cm_id_priv->timeout_ms = param->timeout_ms;
2606         cm_id_priv->max_cm_retries = param->max_cm_retries;
2607         ret = cm_alloc_msg(cm_id_priv, &msg);
2608         if (ret)
2609                 goto out;
2610
2611         cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv,
2612                            param);
2613         msg->send_wr.wr.ud.timeout_ms = cm_id_priv->timeout_ms;
2614         msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT;
2615
2616         spin_lock_irqsave(&cm_id_priv->lock, flags);
2617         if (cm_id->state == IB_CM_IDLE)
2618                 ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent,
2619                                        &msg->send_wr, &bad_send_wr);
2620         else
2621                 ret = -EINVAL;
2622
2623         if (ret) {
2624                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2625                 cm_free_msg(msg);
2626                 goto out;
2627         }
2628         cm_id->state = IB_CM_SIDR_REQ_SENT;
2629         cm_id_priv->msg = msg;
2630         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2631 out:
2632         return ret;
2633 }
2634 EXPORT_SYMBOL(ib_send_cm_sidr_req);
2635
2636 static void cm_format_sidr_req_event(struct cm_work *work,
2637                                      struct ib_cm_id *listen_id)
2638 {
2639         struct cm_sidr_req_msg *sidr_req_msg;
2640         struct ib_cm_sidr_req_event_param *param;
2641
2642         sidr_req_msg = (struct cm_sidr_req_msg *)
2643                                 work->mad_recv_wc->recv_buf.mad;
2644         param = &work->cm_event.param.sidr_req_rcvd;
2645         param->pkey = __be16_to_cpu(sidr_req_msg->pkey);
2646         param->listen_id = listen_id;
2647         param->port = work->port->port_num;
2648         work->cm_event.private_data = &sidr_req_msg->private_data;
2649 }
2650
2651 static int cm_sidr_req_handler(struct cm_work *work)
2652 {
2653         struct ib_cm_id *cm_id;
2654         struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
2655         struct cm_sidr_req_msg *sidr_req_msg;
2656         struct ib_wc *wc;
2657         unsigned long flags;
2658
2659         cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL);
2660         if (IS_ERR(cm_id))
2661                 return PTR_ERR(cm_id);
2662         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2663
2664         /* Record SGID/SLID and request ID for lookup. */
2665         sidr_req_msg = (struct cm_sidr_req_msg *)
2666                                 work->mad_recv_wc->recv_buf.mad;
2667         wc = work->mad_recv_wc->wc;
2668         cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid);
2669         cm_id_priv->av.dgid.global.interface_id = 0;
2670         cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2671                                 &cm_id_priv->av);
2672         cm_id_priv->id.remote_id = sidr_req_msg->request_id;
2673         cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
2674         cm_id_priv->tid = sidr_req_msg->hdr.tid;
2675         atomic_inc(&cm_id_priv->work_count);
2676
2677         spin_lock_irqsave(&cm.lock, flags);
2678         cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
2679         if (cur_cm_id_priv) {
2680                 spin_unlock_irqrestore(&cm.lock, flags);
2681                 goto out; /* Duplicate message. */
2682         }
2683         cur_cm_id_priv = cm_find_listen(cm_id->device,
2684                                         sidr_req_msg->service_id);
2685         if (!cur_cm_id_priv) {
2686                 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
2687                 spin_unlock_irqrestore(&cm.lock, flags);
2688                 /* todo: reply with no match */
2689                 goto out; /* No match. */
2690         }
2691         atomic_inc(&cur_cm_id_priv->refcount);
2692         spin_unlock_irqrestore(&cm.lock, flags);
2693
2694         cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler;
2695         cm_id_priv->id.context = cur_cm_id_priv->id.context;
2696         cm_id_priv->id.service_id = sidr_req_msg->service_id;
2697         cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL);
2698
2699         cm_format_sidr_req_event(work, &cur_cm_id_priv->id);
2700         cm_process_work(cm_id_priv, work);
2701         cm_deref_id(cur_cm_id_priv);
2702         return 0;
2703 out:
2704         ib_destroy_cm_id(&cm_id_priv->id);
2705         return -EINVAL;
2706 }
2707
2708 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
2709                                struct cm_id_private *cm_id_priv,
2710                                struct ib_cm_sidr_rep_param *param)
2711 {
2712         cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
2713                           cm_id_priv->tid);
2714         sidr_rep_msg->request_id = cm_id_priv->id.remote_id;
2715         sidr_rep_msg->status = param->status;
2716         cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num));
2717         sidr_rep_msg->service_id = cm_id_priv->id.service_id;
2718         sidr_rep_msg->qkey = cpu_to_be32(param->qkey);
2719
2720         if (param->info && param->info_length)
2721                 memcpy(sidr_rep_msg->info, param->info, param->info_length);
2722
2723         if (param->private_data && param->private_data_len)
2724                 memcpy(sidr_rep_msg->private_data, param->private_data,
2725                        param->private_data_len);
2726 }
2727
2728 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
2729                         struct ib_cm_sidr_rep_param *param)
2730 {
2731         struct cm_id_private *cm_id_priv;
2732         struct ib_mad_send_buf *msg;
2733         struct ib_send_wr *bad_send_wr;
2734         unsigned long flags;
2735         int ret;
2736
2737         if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
2738             (param->private_data &&
2739              param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE))
2740                 return -EINVAL;
2741
2742         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2743         spin_lock_irqsave(&cm_id_priv->lock, flags);
2744         if (cm_id->state != IB_CM_SIDR_REQ_RCVD) {
2745                 ret = -EINVAL;
2746                 goto error;
2747         }
2748
2749         ret = cm_alloc_msg(cm_id_priv, &msg);
2750         if (ret)
2751                 goto error;
2752
2753         cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
2754                            param);
2755         ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent,
2756                                &msg->send_wr, &bad_send_wr);
2757         if (ret) {
2758                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2759                 cm_free_msg(msg);
2760                 return ret;
2761         }
2762         cm_id->state = IB_CM_IDLE;
2763         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2764
2765         spin_lock_irqsave(&cm.lock, flags);
2766         rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
2767         spin_unlock_irqrestore(&cm.lock, flags);
2768         return 0;
2769
2770 error:  spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2771         return ret;
2772 }
2773 EXPORT_SYMBOL(ib_send_cm_sidr_rep);
2774
2775 static void cm_format_sidr_rep_event(struct cm_work *work)
2776 {
2777         struct cm_sidr_rep_msg *sidr_rep_msg;
2778         struct ib_cm_sidr_rep_event_param *param;
2779
2780         sidr_rep_msg = (struct cm_sidr_rep_msg *)
2781                                 work->mad_recv_wc->recv_buf.mad;
2782         param = &work->cm_event.param.sidr_rep_rcvd;
2783         param->status = sidr_rep_msg->status;
2784         param->qkey = be32_to_cpu(sidr_rep_msg->qkey);
2785         param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg));
2786         param->info = &sidr_rep_msg->info;
2787         param->info_len = sidr_rep_msg->info_length;
2788         work->cm_event.private_data = &sidr_rep_msg->private_data;
2789 }
2790
2791 static int cm_sidr_rep_handler(struct cm_work *work)
2792 {
2793         struct cm_sidr_rep_msg *sidr_rep_msg;
2794         struct cm_id_private *cm_id_priv;
2795         unsigned long flags;
2796
2797         sidr_rep_msg = (struct cm_sidr_rep_msg *)
2798                                 work->mad_recv_wc->recv_buf.mad;
2799         cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0);
2800         if (!cm_id_priv)
2801                 return -EINVAL; /* Unmatched reply. */
2802
2803         spin_lock_irqsave(&cm_id_priv->lock, flags);
2804         if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
2805                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2806                 goto out;
2807         }
2808         cm_id_priv->id.state = IB_CM_IDLE;
2809         ib_cancel_mad(cm_id_priv->av.port->mad_agent,
2810                       (unsigned long) cm_id_priv->msg);
2811         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2812
2813         cm_format_sidr_rep_event(work);
2814         cm_process_work(cm_id_priv, work);
2815         return 0;
2816 out:
2817         cm_deref_id(cm_id_priv);
2818         return -EINVAL;
2819 }
2820
2821 static void cm_process_send_error(struct ib_mad_send_buf *msg,
2822                                   enum ib_wc_status wc_status)
2823 {
2824         struct cm_id_private *cm_id_priv;
2825         struct ib_cm_event cm_event;
2826         enum ib_cm_state state;
2827         unsigned long flags;
2828         int ret;
2829
2830         memset(&cm_event, 0, sizeof cm_event);
2831         cm_id_priv = msg->context[0];
2832
2833         /* Discard old sends or ones without a response. */
2834         spin_lock_irqsave(&cm_id_priv->lock, flags);
2835         state = (enum ib_cm_state) (unsigned long) msg->context[1];
2836         if (msg != cm_id_priv->msg || state != cm_id_priv->id.state)
2837                 goto discard;
2838
2839         switch (state) {
2840         case IB_CM_REQ_SENT:
2841         case IB_CM_MRA_REQ_RCVD:
2842                 cm_reset_to_idle(cm_id_priv);
2843                 cm_event.event = IB_CM_REQ_ERROR;
2844                 break;
2845         case IB_CM_REP_SENT:
2846         case IB_CM_MRA_REP_RCVD:
2847                 cm_reset_to_idle(cm_id_priv);
2848                 cm_event.event = IB_CM_REP_ERROR;
2849                 break;
2850         case IB_CM_DREQ_SENT:
2851                 cm_enter_timewait(cm_id_priv);
2852                 cm_event.event = IB_CM_DREQ_ERROR;
2853                 break;
2854         case IB_CM_SIDR_REQ_SENT:
2855                 cm_id_priv->id.state = IB_CM_IDLE;
2856                 cm_event.event = IB_CM_SIDR_REQ_ERROR;
2857                 break;
2858         default:
2859                 goto discard;
2860         }
2861         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2862         cm_event.param.send_status = wc_status;
2863
2864         /* No other events can occur on the cm_id at this point. */
2865         ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
2866         cm_free_msg(msg);
2867         if (ret)
2868                 ib_destroy_cm_id(&cm_id_priv->id);
2869         return;
2870 discard:
2871         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2872         cm_free_msg(msg);
2873 }
2874
2875 static void cm_send_handler(struct ib_mad_agent *mad_agent,
2876                             struct ib_mad_send_wc *mad_send_wc)
2877 {
2878         struct ib_mad_send_buf *msg;
2879
2880         msg = (struct ib_mad_send_buf *)(unsigned long)mad_send_wc->wr_id;
2881
2882         switch (mad_send_wc->status) {
2883         case IB_WC_SUCCESS:
2884         case IB_WC_WR_FLUSH_ERR:
2885                 cm_free_msg(msg);
2886                 break;
2887         default:
2888                 if (msg->context[0] && msg->context[1])
2889                         cm_process_send_error(msg, mad_send_wc->status);
2890                 else
2891                         cm_free_msg(msg);
2892                 break;
2893         }
2894 }
2895
2896 static void cm_work_handler(void *data)
2897 {
2898         struct cm_work *work = data;
2899         int ret;
2900
2901         switch (work->cm_event.event) {
2902         case IB_CM_REQ_RECEIVED:
2903                 ret = cm_req_handler(work);
2904                 break;
2905         case IB_CM_MRA_RECEIVED:
2906                 ret = cm_mra_handler(work);
2907                 break;
2908         case IB_CM_REJ_RECEIVED:
2909                 ret = cm_rej_handler(work);
2910                 break;
2911         case IB_CM_REP_RECEIVED:
2912                 ret = cm_rep_handler(work);
2913                 break;
2914         case IB_CM_RTU_RECEIVED:
2915                 ret = cm_rtu_handler(work);
2916                 break;
2917         case IB_CM_USER_ESTABLISHED:
2918                 ret = cm_establish_handler(work);
2919                 break;
2920         case IB_CM_DREQ_RECEIVED:
2921                 ret = cm_dreq_handler(work);
2922                 break;
2923         case IB_CM_DREP_RECEIVED:
2924                 ret = cm_drep_handler(work);
2925                 break;
2926         case IB_CM_SIDR_REQ_RECEIVED:
2927                 ret = cm_sidr_req_handler(work);
2928                 break;
2929         case IB_CM_SIDR_REP_RECEIVED:
2930                 ret = cm_sidr_rep_handler(work);
2931                 break;
2932         case IB_CM_LAP_RECEIVED:
2933                 ret = cm_lap_handler(work);
2934                 break;
2935         case IB_CM_APR_RECEIVED:
2936                 ret = cm_apr_handler(work);
2937                 break;
2938         case IB_CM_TIMEWAIT_EXIT:
2939                 ret = cm_timewait_handler(work);
2940                 break;
2941         default:
2942                 ret = -EINVAL;
2943                 break;
2944         }
2945         if (ret)
2946                 cm_free_work(work);
2947 }
2948
2949 int ib_cm_establish(struct ib_cm_id *cm_id)
2950 {
2951         struct cm_id_private *cm_id_priv;
2952         struct cm_work *work;
2953         unsigned long flags;
2954         int ret = 0;
2955
2956         work = kmalloc(sizeof *work, GFP_ATOMIC);
2957         if (!work)
2958                 return -ENOMEM;
2959
2960         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2961         spin_lock_irqsave(&cm_id_priv->lock, flags);
2962         switch (cm_id->state)
2963         {
2964         case IB_CM_REP_SENT:
2965         case IB_CM_MRA_REP_RCVD:
2966                 cm_id->state = IB_CM_ESTABLISHED;
2967                 break;
2968         case IB_CM_ESTABLISHED:
2969                 ret = -EISCONN;
2970                 break;
2971         default:
2972                 ret = -EINVAL;
2973                 break;
2974         }
2975         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2976
2977         if (ret) {
2978                 kfree(work);
2979                 goto out;
2980         }
2981
2982         /*
2983          * The CM worker thread may try to destroy the cm_id before it
2984          * can execute this work item.  To prevent potential deadlock,
2985          * we need to find the cm_id once we're in the context of the
2986          * worker thread, rather than holding a reference on it.
2987          */
2988         INIT_WORK(&work->work, cm_work_handler, work);
2989         work->local_id = cm_id->local_id;
2990         work->remote_id = cm_id->remote_id;
2991         work->mad_recv_wc = NULL;
2992         work->cm_event.event = IB_CM_USER_ESTABLISHED;
2993         queue_work(cm.wq, &work->work);
2994 out:
2995         return ret;
2996 }
2997 EXPORT_SYMBOL(ib_cm_establish);
2998
2999 static void cm_recv_handler(struct ib_mad_agent *mad_agent,
3000                             struct ib_mad_recv_wc *mad_recv_wc)
3001 {
3002         struct cm_work *work;
3003         enum ib_cm_event_type event;
3004         int paths = 0;
3005
3006         switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
3007         case CM_REQ_ATTR_ID:
3008                 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)->
3009                                                     alt_local_lid != 0);
3010                 event = IB_CM_REQ_RECEIVED;
3011                 break;
3012         case CM_MRA_ATTR_ID:
3013                 event = IB_CM_MRA_RECEIVED;
3014                 break;
3015         case CM_REJ_ATTR_ID:
3016                 event = IB_CM_REJ_RECEIVED;
3017                 break;
3018         case CM_REP_ATTR_ID:
3019                 event = IB_CM_REP_RECEIVED;
3020                 break;
3021         case CM_RTU_ATTR_ID:
3022                 event = IB_CM_RTU_RECEIVED;
3023                 break;
3024         case CM_DREQ_ATTR_ID:
3025                 event = IB_CM_DREQ_RECEIVED;
3026                 break;
3027         case CM_DREP_ATTR_ID:
3028                 event = IB_CM_DREP_RECEIVED;
3029                 break;
3030         case CM_SIDR_REQ_ATTR_ID:
3031                 event = IB_CM_SIDR_REQ_RECEIVED;
3032                 break;
3033         case CM_SIDR_REP_ATTR_ID:
3034                 event = IB_CM_SIDR_REP_RECEIVED;
3035                 break;
3036         case CM_LAP_ATTR_ID:
3037                 paths = 1;
3038                 event = IB_CM_LAP_RECEIVED;
3039                 break;
3040         case CM_APR_ATTR_ID:
3041                 event = IB_CM_APR_RECEIVED;
3042                 break;
3043         default:
3044                 ib_free_recv_mad(mad_recv_wc);
3045                 return;
3046         }
3047
3048         work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths,
3049                        GFP_KERNEL);
3050         if (!work) {
3051                 ib_free_recv_mad(mad_recv_wc);
3052                 return;
3053         }
3054
3055         INIT_WORK(&work->work, cm_work_handler, work);
3056         work->cm_event.event = event;
3057         work->mad_recv_wc = mad_recv_wc;
3058         work->port = (struct cm_port *)mad_agent->context;
3059         queue_work(cm.wq, &work->work);
3060 }
3061
3062 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
3063                                 struct ib_qp_attr *qp_attr,
3064                                 int *qp_attr_mask)
3065 {
3066         unsigned long flags;
3067         int ret;
3068
3069         spin_lock_irqsave(&cm_id_priv->lock, flags);
3070         switch (cm_id_priv->id.state) {
3071         case IB_CM_REQ_SENT:
3072         case IB_CM_MRA_REQ_RCVD:
3073         case IB_CM_REQ_RCVD:
3074         case IB_CM_MRA_REQ_SENT:
3075         case IB_CM_REP_RCVD:
3076         case IB_CM_MRA_REP_SENT:
3077         case IB_CM_REP_SENT:
3078         case IB_CM_MRA_REP_RCVD:
3079         case IB_CM_ESTABLISHED:
3080                 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
3081                                 IB_QP_PKEY_INDEX | IB_QP_PORT;
3082                 qp_attr->qp_access_flags = IB_ACCESS_LOCAL_WRITE;
3083                 if (cm_id_priv->responder_resources)
3084                         qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_WRITE |
3085                                                     IB_ACCESS_REMOTE_READ;
3086                 qp_attr->pkey_index = cm_id_priv->av.pkey_index;
3087                 qp_attr->port_num = cm_id_priv->av.port->port_num;
3088                 ret = 0;
3089                 break;
3090         default:
3091                 ret = -EINVAL;
3092                 break;
3093         }
3094         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3095         return ret;
3096 }
3097
3098 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
3099                                struct ib_qp_attr *qp_attr,
3100                                int *qp_attr_mask)
3101 {
3102         unsigned long flags;
3103         int ret;
3104
3105         spin_lock_irqsave(&cm_id_priv->lock, flags);
3106         switch (cm_id_priv->id.state) {
3107         case IB_CM_REQ_RCVD:
3108         case IB_CM_MRA_REQ_SENT:
3109         case IB_CM_REP_RCVD:
3110         case IB_CM_MRA_REP_SENT:
3111         case IB_CM_REP_SENT:
3112         case IB_CM_MRA_REP_RCVD:
3113         case IB_CM_ESTABLISHED:
3114                 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
3115                                 IB_QP_DEST_QPN | IB_QP_RQ_PSN |
3116                                 IB_QP_MAX_DEST_RD_ATOMIC | IB_QP_MIN_RNR_TIMER;
3117                 qp_attr->ah_attr = cm_id_priv->av.ah_attr;
3118                 qp_attr->path_mtu = cm_id_priv->path_mtu;
3119                 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
3120                 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
3121                 qp_attr->max_dest_rd_atomic = cm_id_priv->responder_resources;
3122                 qp_attr->min_rnr_timer = 0;
3123                 if (cm_id_priv->alt_av.ah_attr.dlid) {
3124                         *qp_attr_mask |= IB_QP_ALT_PATH;
3125                         qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3126                 }
3127                 ret = 0;
3128                 break;
3129         default:
3130                 ret = -EINVAL;
3131                 break;
3132         }
3133         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3134         return ret;
3135 }
3136
3137 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv,
3138                                struct ib_qp_attr *qp_attr,
3139                                int *qp_attr_mask)
3140 {
3141         unsigned long flags;
3142         int ret;
3143
3144         spin_lock_irqsave(&cm_id_priv->lock, flags);
3145         switch (cm_id_priv->id.state) {
3146         case IB_CM_REP_RCVD:
3147         case IB_CM_MRA_REP_SENT:
3148         case IB_CM_REP_SENT:
3149         case IB_CM_MRA_REP_RCVD:
3150         case IB_CM_ESTABLISHED:
3151                 *qp_attr_mask = IB_QP_STATE | IB_QP_TIMEOUT | IB_QP_RETRY_CNT |
3152                                 IB_QP_RNR_RETRY | IB_QP_SQ_PSN |
3153                                 IB_QP_MAX_QP_RD_ATOMIC;
3154                 qp_attr->timeout = cm_id_priv->local_ack_timeout;
3155                 qp_attr->retry_cnt = cm_id_priv->retry_count;
3156                 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count;
3157                 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn);
3158                 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth;
3159                 if (cm_id_priv->alt_av.ah_attr.dlid) {
3160                         *qp_attr_mask |= IB_QP_PATH_MIG_STATE;
3161                         qp_attr->path_mig_state = IB_MIG_REARM;
3162                 }
3163                 ret = 0;
3164                 break;
3165         default:
3166                 ret = -EINVAL;
3167                 break;
3168         }
3169         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3170         return ret;
3171 }
3172
3173 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
3174                        struct ib_qp_attr *qp_attr,
3175                        int *qp_attr_mask)
3176 {
3177         struct cm_id_private *cm_id_priv;
3178         int ret;
3179
3180         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3181         switch (qp_attr->qp_state) {
3182         case IB_QPS_INIT:
3183                 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask);
3184                 break;
3185         case IB_QPS_RTR:
3186                 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask);
3187                 break;
3188         case IB_QPS_RTS:
3189                 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask);
3190                 break;
3191         default:
3192                 ret = -EINVAL;
3193                 break;
3194         }
3195         return ret;
3196 }
3197 EXPORT_SYMBOL(ib_cm_init_qp_attr);
3198
3199 static __be64 cm_get_ca_guid(struct ib_device *device)
3200 {
3201         struct ib_device_attr *device_attr;
3202         __be64 guid;
3203         int ret;
3204
3205         device_attr = kmalloc(sizeof *device_attr, GFP_KERNEL);
3206         if (!device_attr)
3207                 return 0;
3208
3209         ret = ib_query_device(device, device_attr);
3210         guid = ret ? 0 : device_attr->node_guid;
3211         kfree(device_attr);
3212         return guid;
3213 }
3214
3215 static void cm_add_one(struct ib_device *device)
3216 {
3217         struct cm_device *cm_dev;
3218         struct cm_port *port;
3219         struct ib_mad_reg_req reg_req = {
3220                 .mgmt_class = IB_MGMT_CLASS_CM,
3221                 .mgmt_class_version = IB_CM_CLASS_VERSION
3222         };
3223         struct ib_port_modify port_modify = {
3224                 .set_port_cap_mask = IB_PORT_CM_SUP
3225         };
3226         unsigned long flags;
3227         int ret;
3228         u8 i;
3229
3230         cm_dev = kmalloc(sizeof(*cm_dev) + sizeof(*port) *
3231                          device->phys_port_cnt, GFP_KERNEL);
3232         if (!cm_dev)
3233                 return;
3234
3235         cm_dev->device = device;
3236         cm_dev->ca_guid = cm_get_ca_guid(device);
3237         if (!cm_dev->ca_guid)
3238                 goto error1;
3239
3240         set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
3241         for (i = 1; i <= device->phys_port_cnt; i++) {
3242                 port = &cm_dev->port[i-1];
3243                 port->cm_dev = cm_dev;
3244                 port->port_num = i;
3245                 port->mad_agent = ib_register_mad_agent(device, i,
3246                                                         IB_QPT_GSI,
3247                                                         &reg_req,
3248                                                         0,
3249                                                         cm_send_handler,
3250                                                         cm_recv_handler,
3251                                                         port);
3252                 if (IS_ERR(port->mad_agent))
3253                         goto error2;
3254
3255                 ret = ib_modify_port(device, i, 0, &port_modify);
3256                 if (ret)
3257                         goto error3;
3258         }
3259         ib_set_client_data(device, &cm_client, cm_dev);
3260
3261         write_lock_irqsave(&cm.device_lock, flags);
3262         list_add_tail(&cm_dev->list, &cm.device_list);
3263         write_unlock_irqrestore(&cm.device_lock, flags);
3264         return;
3265
3266 error3:
3267         ib_unregister_mad_agent(port->mad_agent);
3268 error2:
3269         port_modify.set_port_cap_mask = 0;
3270         port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
3271         while (--i) {
3272                 port = &cm_dev->port[i-1];
3273                 ib_modify_port(device, port->port_num, 0, &port_modify);
3274                 ib_unregister_mad_agent(port->mad_agent);
3275         }
3276 error1:
3277         kfree(cm_dev);
3278 }
3279
3280 static void cm_remove_one(struct ib_device *device)
3281 {
3282         struct cm_device *cm_dev;
3283         struct cm_port *port;
3284         struct ib_port_modify port_modify = {
3285                 .clr_port_cap_mask = IB_PORT_CM_SUP
3286         };
3287         unsigned long flags;
3288         int i;
3289
3290         cm_dev = ib_get_client_data(device, &cm_client);
3291         if (!cm_dev)
3292                 return;
3293
3294         write_lock_irqsave(&cm.device_lock, flags);
3295         list_del(&cm_dev->list);
3296         write_unlock_irqrestore(&cm.device_lock, flags);
3297
3298         for (i = 1; i <= device->phys_port_cnt; i++) {
3299                 port = &cm_dev->port[i-1];
3300                 ib_modify_port(device, port->port_num, 0, &port_modify);
3301                 ib_unregister_mad_agent(port->mad_agent);
3302         }
3303         kfree(cm_dev);
3304 }
3305
3306 static int __init ib_cm_init(void)
3307 {
3308         int ret;
3309
3310         memset(&cm, 0, sizeof cm);
3311         INIT_LIST_HEAD(&cm.device_list);
3312         rwlock_init(&cm.device_lock);
3313         spin_lock_init(&cm.lock);
3314         cm.listen_service_table = RB_ROOT;
3315         cm.listen_service_id = __constant_be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID);
3316         cm.remote_id_table = RB_ROOT;
3317         cm.remote_qp_table = RB_ROOT;
3318         cm.remote_sidr_table = RB_ROOT;
3319         idr_init(&cm.local_id_table);
3320         idr_pre_get(&cm.local_id_table, GFP_KERNEL);
3321
3322         cm.wq = create_workqueue("ib_cm");
3323         if (!cm.wq)
3324                 return -ENOMEM;
3325
3326         ret = ib_register_client(&cm_client);
3327         if (ret)
3328                 goto error;
3329
3330         return 0;
3331 error:
3332         destroy_workqueue(cm.wq);
3333         return ret;
3334 }
3335
3336 static void __exit ib_cm_cleanup(void)
3337 {
3338         flush_workqueue(cm.wq);
3339         destroy_workqueue(cm.wq);
3340         ib_unregister_client(&cm_client);
3341         idr_destroy(&cm.local_id_table);
3342 }
3343
3344 module_init(ib_cm_init);
3345 module_exit(ib_cm_cleanup);
3346