git.oblomov.eu Git - linux-2.6/blob - 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 4311 2005-12-05 18:42:01Z sean.hefty $
  36  */
  37
  38 #include <linux/completion.h>
  39 #include <linux/dma-mapping.h>
  40 #include <linux/err.h>
  41 #include <linux/idr.h>
  42 #include <linux/interrupt.h>
  43 #include <linux/pci.h>
  44 #include <linux/rbtree.h>
  45 #include <linux/spinlock.h>
  46 #include <linux/workqueue.h>
  47
  48 #include <rdma/ib_cache.h>
  49 #include <rdma/ib_cm.h>
  50 #include "cm_msgs.h"
  51
  52 MODULE_AUTHOR("Sean Hefty");
  53 MODULE_DESCRIPTION("InfiniBand CM");
  54 MODULE_LICENSE("Dual BSD/GPL");
  55
  56 static void cm_add_one(struct ib_device *device);
  57 static void cm_remove_one(struct ib_device *device);
  58
  59 static struct ib_client cm_client = {
  60         .name   = "cm",
  61         .add    = cm_add_one,
  62         .remove = cm_remove_one
  63 };
  64
  65 static struct ib_cm {
  66         spinlock_t lock;
  67         struct list_head device_list;
  68         rwlock_t device_lock;
  69         struct rb_root listen_service_table;
  70         u64 listen_service_id;
  71         /* struct rb_root peer_service_table; todo: fix peer to peer */
  72         struct rb_root remote_qp_table;
  73         struct rb_root remote_id_table;
  74         struct rb_root remote_sidr_table;
  75         struct idr local_id_table;
  76         struct workqueue_struct *wq;
  77 } cm;
  78
  79 struct cm_port {
  80         struct cm_device *cm_dev;
  81         struct ib_mad_agent *mad_agent;
  82         u8 port_num;
  83 };
  84
  85 struct cm_device {
  86         struct list_head list;
  87         struct ib_device *device;
  88         __be64 ca_guid;
  89         struct cm_port port[0];
  90 };
  91
  92 struct cm_av {
  93         struct cm_port *port;
  94         union ib_gid dgid;
  95         struct ib_ah_attr ah_attr;
  96         u16 pkey_index;
  97         u8 packet_life_time;
  98 };
  99
 100 struct cm_work {
 101         struct work_struct work;
 102         struct list_head list;
 103         struct cm_port *port;
 104         struct ib_mad_recv_wc *mad_recv_wc;     /* Received MADs */
 105         __be32 local_id;                        /* Established / timewait */
 106         __be32 remote_id;
 107         struct ib_cm_event cm_event;
 108         struct ib_sa_path_rec path[0];
 109 };
 110
 111 struct cm_timewait_info {
 112         struct cm_work work;                    /* Must be first. */
 113         struct rb_node remote_qp_node;
 114         struct rb_node remote_id_node;
 115         __be64 remote_ca_guid;
 116         __be32 remote_qpn;
 117         u8 inserted_remote_qp;
 118         u8 inserted_remote_id;
 119 };
 120
 121 struct cm_id_private {
 122         struct ib_cm_id id;
 123
 124         struct rb_node service_node;
 125         struct rb_node sidr_id_node;
 126         spinlock_t lock;        /* Do not acquire inside cm.lock */
 127         struct completion comp;
 128         atomic_t refcount;
 129
 130         struct ib_mad_send_buf *msg;
 131         struct cm_timewait_info *timewait_info;
 132         /* todo: use alternate port on send failure */
 133         struct cm_av av;
 134         struct cm_av alt_av;
 135         struct ib_cm_compare_data *compare_data;
 136
 137         void *private_data;
 138         __be64 tid;
 139         __be32 local_qpn;
 140         __be32 remote_qpn;
 141         enum ib_qp_type qp_type;
 142         __be32 sq_psn;
 143         __be32 rq_psn;
 144         int timeout_ms;
 145         enum ib_mtu path_mtu;
 146         u8 private_data_len;
 147         u8 max_cm_retries;
 148         u8 peer_to_peer;
 149         u8 responder_resources;
 150         u8 initiator_depth;
 151         u8 local_ack_timeout;
 152         u8 retry_count;
 153         u8 rnr_retry_count;
 154         u8 service_timeout;
 155
 156         struct list_head work_list;
 157         atomic_t work_count;
 158 };
 159
 160 static void cm_work_handler(void *data);
 161
 162 static inline void cm_deref_id(struct cm_id_private *cm_id_priv)
 163 {
 164         if (atomic_dec_and_test(&cm_id_priv->refcount))
 165                 complete(&cm_id_priv->comp);
 166 }
 167
 168 static int cm_alloc_msg(struct cm_id_private *cm_id_priv,
 169                         struct ib_mad_send_buf **msg)
 170 {
 171         struct ib_mad_agent *mad_agent;
 172         struct ib_mad_send_buf *m;
 173         struct ib_ah *ah;
 174
 175         mad_agent = cm_id_priv->av.port->mad_agent;
 176         ah = ib_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr);
 177         if (IS_ERR(ah))
 178                 return PTR_ERR(ah);
 179
 180         m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn,
 181                                cm_id_priv->av.pkey_index,
 182                                0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
 183                                GFP_ATOMIC);
 184         if (IS_ERR(m)) {
 185                 ib_destroy_ah(ah);
 186                 return PTR_ERR(m);
 187         }
 188
 189         /* Timeout set by caller if response is expected. */
 190         m->ah = ah;
 191         m->retries = cm_id_priv->max_cm_retries;
 192
 193         atomic_inc(&cm_id_priv->refcount);
 194         m->context[0] = cm_id_priv;
 195         *msg = m;
 196         return 0;
 197 }
 198
 199 static int cm_alloc_response_msg(struct cm_port *port,
 200                                  struct ib_mad_recv_wc *mad_recv_wc,
 201                                  struct ib_mad_send_buf **msg)
 202 {
 203         struct ib_mad_send_buf *m;
 204         struct ib_ah *ah;
 205
 206         ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc,
 207                                   mad_recv_wc->recv_buf.grh, port->port_num);
 208         if (IS_ERR(ah))
 209                 return PTR_ERR(ah);
 210
 211         m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index,
 212                                0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
 213                                GFP_ATOMIC);
 214         if (IS_ERR(m)) {
 215                 ib_destroy_ah(ah);
 216                 return PTR_ERR(m);
 217         }
 218         m->ah = ah;
 219         *msg = m;
 220         return 0;
 221 }
 222
 223 static void cm_free_msg(struct ib_mad_send_buf *msg)
 224 {
 225         ib_destroy_ah(msg->ah);
 226         if (msg->context[0])
 227                 cm_deref_id(msg->context[0]);
 228         ib_free_send_mad(msg);
 229 }
 230
 231 static void * cm_copy_private_data(const void *private_data,
 232                                    u8 private_data_len)
 233 {
 234         void *data;
 235
 236         if (!private_data || !private_data_len)
 237                 return NULL;
 238
 239         data = kmalloc(private_data_len, GFP_KERNEL);
 240         if (!data)
 241                 return ERR_PTR(-ENOMEM);
 242
 243         memcpy(data, private_data, private_data_len);
 244         return data;
 245 }
 246
 247 static void cm_set_private_data(struct cm_id_private *cm_id_priv,
 248                                  void *private_data, u8 private_data_len)
 249 {
 250         if (cm_id_priv->private_data && cm_id_priv->private_data_len)
 251                 kfree(cm_id_priv->private_data);
 252
 253         cm_id_priv->private_data = private_data;
 254         cm_id_priv->private_data_len = private_data_len;
 255 }
 256
 257 static void cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc,
 258                                     struct ib_grh *grh, struct cm_av *av)
 259 {
 260         av->port = port;
 261         av->pkey_index = wc->pkey_index;
 262         ib_init_ah_from_wc(port->cm_dev->device, port->port_num, wc,
 263                            grh, &av->ah_attr);
 264 }
 265
 266 static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av)
 267 {
 268         struct cm_device *cm_dev;
 269         struct cm_port *port = NULL;
 270         unsigned long flags;
 271         int ret;
 272         u8 p;
 273
 274         read_lock_irqsave(&cm.device_lock, flags);
 275         list_for_each_entry(cm_dev, &cm.device_list, list) {
 276                 if (!ib_find_cached_gid(cm_dev->device, &path->sgid,
 277                                         &p, NULL)) {
 278                         port = &cm_dev->port[p-1];
 279                         break;
 280                 }
 281         }
 282         read_unlock_irqrestore(&cm.device_lock, flags);
 283
 284         if (!port)
 285                 return -EINVAL;
 286
 287         ret = ib_find_cached_pkey(cm_dev->device, port->port_num,
 288                                   be16_to_cpu(path->pkey), &av->pkey_index);
 289         if (ret)
 290                 return ret;
 291
 292         av->port = port;
 293         ib_init_ah_from_path(cm_dev->device, port->port_num, path,
 294                              &av->ah_attr);
 295         av->packet_life_time = path->packet_life_time;
 296         return 0;
 297 }
 298
 299 static int cm_alloc_id(struct cm_id_private *cm_id_priv)
 300 {
 301         unsigned long flags;
 302         int ret;
 303         static int next_id;
 304
 305         do {
 306                 spin_lock_irqsave(&cm.lock, flags);
 307                 ret = idr_get_new_above(&cm.local_id_table, cm_id_priv, next_id++,
 308                                         (__force int *) &cm_id_priv->id.local_id);
 309                 spin_unlock_irqrestore(&cm.lock, flags);
 310         } while( (ret == -EAGAIN) && idr_pre_get(&cm.local_id_table, GFP_KERNEL) );
 311         return ret;
 312 }
 313
 314 static void cm_free_id(__be32 local_id)
 315 {
 316         unsigned long flags;
 317
 318         spin_lock_irqsave(&cm.lock, flags);
 319         idr_remove(&cm.local_id_table, (__force int) local_id);
 320         spin_unlock_irqrestore(&cm.lock, flags);
 321 }
 322
 323 static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id)
 324 {
 325         struct cm_id_private *cm_id_priv;
 326
 327         cm_id_priv = idr_find(&cm.local_id_table, (__force int) local_id);
 328         if (cm_id_priv) {
 329                 if (cm_id_priv->id.remote_id == remote_id)
 330                         atomic_inc(&cm_id_priv->refcount);
 331                 else
 332                         cm_id_priv = NULL;
 333         }
 334
 335         return cm_id_priv;
 336 }
 337
 338 static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id)
 339 {
 340         struct cm_id_private *cm_id_priv;
 341         unsigned long flags;
 342
 343         spin_lock_irqsave(&cm.lock, flags);
 344         cm_id_priv = cm_get_id(local_id, remote_id);
 345         spin_unlock_irqrestore(&cm.lock, flags);
 346
 347         return cm_id_priv;
 348 }
 349
 350 static void cm_mask_copy(u8 *dst, u8 *src, u8 *mask)
 351 {
 352         int i;
 353
 354         for (i = 0; i < IB_CM_COMPARE_SIZE / sizeof(unsigned long); i++)
 355                 ((unsigned long *) dst)[i] = ((unsigned long *) src)[i] &
 356                                              ((unsigned long *) mask)[i];
 357 }
 358
 359 static int cm_compare_data(struct ib_cm_compare_data *src_data,
 360                            struct ib_cm_compare_data *dst_data)
 361 {
 362         u8 src[IB_CM_COMPARE_SIZE];
 363         u8 dst[IB_CM_COMPARE_SIZE];
 364
 365         if (!src_data || !dst_data)
 366                 return 0;
 367
 368         cm_mask_copy(src, src_data->data, dst_data->mask);
 369         cm_mask_copy(dst, dst_data->data, src_data->mask);
 370         return memcmp(src, dst, IB_CM_COMPARE_SIZE);
 371 }
 372
 373 static int cm_compare_private_data(u8 *private_data,
 374                                    struct ib_cm_compare_data *dst_data)
 375 {
 376         u8 src[IB_CM_COMPARE_SIZE];
 377
 378         if (!dst_data)
 379                 return 0;
 380
 381         cm_mask_copy(src, private_data, dst_data->mask);
 382         return memcmp(src, dst_data->data, IB_CM_COMPARE_SIZE);
 383 }
 384
 385 static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv)
 386 {
 387         struct rb_node **link = &cm.listen_service_table.rb_node;
 388         struct rb_node *parent = NULL;
 389         struct cm_id_private *cur_cm_id_priv;
 390         __be64 service_id = cm_id_priv->id.service_id;
 391         __be64 service_mask = cm_id_priv->id.service_mask;
 392         int data_cmp;
 393
 394         while (*link) {
 395                 parent = *link;
 396                 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
 397                                           service_node);
 398                 data_cmp = cm_compare_data(cm_id_priv->compare_data,
 399                                            cur_cm_id_priv->compare_data);
 400                 if ((cur_cm_id_priv->id.service_mask & service_id) ==
 401                     (service_mask & cur_cm_id_priv->id.service_id) &&
 402                     (cm_id_priv->id.device == cur_cm_id_priv->id.device) &&
 403                     !data_cmp)
 404                         return cur_cm_id_priv;
 405
 406                 if (cm_id_priv->id.device < cur_cm_id_priv->id.device)
 407                         link = &(*link)->rb_left;
 408                 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device)
 409                         link = &(*link)->rb_right;
 410                 else if (service_id < cur_cm_id_priv->id.service_id)
 411                         link = &(*link)->rb_left;
 412                 else if (service_id > cur_cm_id_priv->id.service_id)
 413                         link = &(*link)->rb_right;
 414                 else if (data_cmp < 0)
 415                         link = &(*link)->rb_left;
 416                 else
 417                         link = &(*link)->rb_right;
 418         }
 419         rb_link_node(&cm_id_priv->service_node, parent, link);
 420         rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table);
 421         return NULL;
 422 }
 423
 424 static struct cm_id_private * cm_find_listen(struct ib_device *device,
 425                                              __be64 service_id,
 426                                              u8 *private_data)
 427 {
 428         struct rb_node *node = cm.listen_service_table.rb_node;
 429         struct cm_id_private *cm_id_priv;
 430         int data_cmp;
 431
 432         while (node) {
 433                 cm_id_priv = rb_entry(node, struct cm_id_private, service_node);
 434                 data_cmp = cm_compare_private_data(private_data,
 435                                                    cm_id_priv->compare_data);
 436                 if ((cm_id_priv->id.service_mask & service_id) ==
 437                      cm_id_priv->id.service_id &&
 438                     (cm_id_priv->id.device == device) && !data_cmp)
 439                         return cm_id_priv;
 440
 441                 if (device < cm_id_priv->id.device)
 442                         node = node->rb_left;
 443                 else if (device > cm_id_priv->id.device)
 444                         node = node->rb_right;
 445                 else if (service_id < cm_id_priv->id.service_id)
 446                         node = node->rb_left;
 447                 else if (service_id > cm_id_priv->id.service_id)
 448                         node = node->rb_right;
 449                 else if (data_cmp < 0)
 450                         node = node->rb_left;
 451                 else
 452                         node = node->rb_right;
 453         }
 454         return NULL;
 455 }
 456
 457 static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info
 458                                                      *timewait_info)
 459 {
 460         struct rb_node **link = &cm.remote_id_table.rb_node;
 461         struct rb_node *parent = NULL;
 462         struct cm_timewait_info *cur_timewait_info;
 463         __be64 remote_ca_guid = timewait_info->remote_ca_guid;
 464         __be32 remote_id = timewait_info->work.remote_id;
 465
 466         while (*link) {
 467                 parent = *link;
 468                 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
 469                                              remote_id_node);
 470                 if (remote_id < cur_timewait_info->work.remote_id)
 471                         link = &(*link)->rb_left;
 472                 else if (remote_id > cur_timewait_info->work.remote_id)
 473                         link = &(*link)->rb_right;
 474                 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid)
 475                         link = &(*link)->rb_left;
 476                 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid)
 477                         link = &(*link)->rb_right;
 478                 else
 479                         return cur_timewait_info;
 480         }
 481         timewait_info->inserted_remote_id = 1;
 482         rb_link_node(&timewait_info->remote_id_node, parent, link);
 483         rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table);
 484         return NULL;
 485 }
 486
 487 static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid,
 488                                                    __be32 remote_id)
 489 {
 490         struct rb_node *node = cm.remote_id_table.rb_node;
 491         struct cm_timewait_info *timewait_info;
 492
 493         while (node) {
 494                 timewait_info = rb_entry(node, struct cm_timewait_info,
 495                                          remote_id_node);
 496                 if (remote_id < timewait_info->work.remote_id)
 497                         node = node->rb_left;
 498                 else if (remote_id > timewait_info->work.remote_id)
 499                         node = node->rb_right;
 500                 else if (remote_ca_guid < timewait_info->remote_ca_guid)
 501                         node = node->rb_left;
 502                 else if (remote_ca_guid > timewait_info->remote_ca_guid)
 503                         node = node->rb_right;
 504                 else
 505                         return timewait_info;
 506         }
 507         return NULL;
 508 }
 509
 510 static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info
 511                                                       *timewait_info)
 512 {
 513         struct rb_node **link = &cm.remote_qp_table.rb_node;
 514         struct rb_node *parent = NULL;
 515         struct cm_timewait_info *cur_timewait_info;
 516         __be64 remote_ca_guid = timewait_info->remote_ca_guid;
 517         __be32 remote_qpn = timewait_info->remote_qpn;
 518
 519         while (*link) {
 520                 parent = *link;
 521                 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
 522                                              remote_qp_node);
 523                 if (remote_qpn < cur_timewait_info->remote_qpn)
 524                         link = &(*link)->rb_left;
 525                 else if (remote_qpn > cur_timewait_info->remote_qpn)
 526                         link = &(*link)->rb_right;
 527                 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid)
 528                         link = &(*link)->rb_left;
 529                 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid)
 530                         link = &(*link)->rb_right;
 531                 else
 532                         return cur_timewait_info;
 533         }
 534         timewait_info->inserted_remote_qp = 1;
 535         rb_link_node(&timewait_info->remote_qp_node, parent, link);
 536         rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table);
 537         return NULL;
 538 }
 539
 540 static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private
 541                                                     *cm_id_priv)
 542 {
 543         struct rb_node **link = &cm.remote_sidr_table.rb_node;
 544         struct rb_node *parent = NULL;
 545         struct cm_id_private *cur_cm_id_priv;
 546         union ib_gid *port_gid = &cm_id_priv->av.dgid;
 547         __be32 remote_id = cm_id_priv->id.remote_id;
 548
 549         while (*link) {
 550                 parent = *link;
 551                 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
 552                                           sidr_id_node);
 553                 if (remote_id < cur_cm_id_priv->id.remote_id)
 554                         link = &(*link)->rb_left;
 555                 else if (remote_id > cur_cm_id_priv->id.remote_id)
 556                         link = &(*link)->rb_right;
 557                 else {
 558                         int cmp;
 559                         cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid,
 560                                      sizeof *port_gid);
 561                         if (cmp < 0)
 562                                 link = &(*link)->rb_left;
 563                         else if (cmp > 0)
 564                                 link = &(*link)->rb_right;
 565                         else
 566                                 return cur_cm_id_priv;
 567                 }
 568         }
 569         rb_link_node(&cm_id_priv->sidr_id_node, parent, link);
 570         rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
 571         return NULL;
 572 }
 573
 574 static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv,
 575                                enum ib_cm_sidr_status status)
 576 {
 577         struct ib_cm_sidr_rep_param param;
 578
 579         memset(&param, 0, sizeof param);
 580         param.status = status;
 581         ib_send_cm_sidr_rep(&cm_id_priv->id, &param);
 582 }
 583
 584 struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
 585                                  ib_cm_handler cm_handler,
 586                                  void *context)
 587 {
 588         struct cm_id_private *cm_id_priv;
 589         int ret;
 590
 591         cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL);
 592         if (!cm_id_priv)
 593                 return ERR_PTR(-ENOMEM);
 594
 595         cm_id_priv->id.state = IB_CM_IDLE;
 596         cm_id_priv->id.device = device;
 597         cm_id_priv->id.cm_handler = cm_handler;
 598         cm_id_priv->id.context = context;
 599         cm_id_priv->id.remote_cm_qpn = 1;
 600         ret = cm_alloc_id(cm_id_priv);
 601         if (ret)
 602                 goto error;
 603
 604         spin_lock_init(&cm_id_priv->lock);
 605         init_completion(&cm_id_priv->comp);
 606         INIT_LIST_HEAD(&cm_id_priv->work_list);
 607         atomic_set(&cm_id_priv->work_count, -1);
 608         atomic_set(&cm_id_priv->refcount, 1);
 609         return &cm_id_priv->id;
 610
 611 error:
 612         kfree(cm_id_priv);
 613         return ERR_PTR(-ENOMEM);
 614 }
 615 EXPORT_SYMBOL(ib_create_cm_id);
 616
 617 static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv)
 618 {
 619         struct cm_work *work;
 620
 621         if (list_empty(&cm_id_priv->work_list))
 622                 return NULL;
 623
 624         work = list_entry(cm_id_priv->work_list.next, struct cm_work, list);
 625         list_del(&work->list);
 626         return work;
 627 }
 628
 629 static void cm_free_work(struct cm_work *work)
 630 {
 631         if (work->mad_recv_wc)
 632                 ib_free_recv_mad(work->mad_recv_wc);
 633         kfree(work);
 634 }
 635
 636 static inline int cm_convert_to_ms(int iba_time)
 637 {
 638         /* approximate conversion to ms from 4.096us x 2^iba_time */
 639         return 1 << max(iba_time - 8, 0);
 640 }
 641
 642 static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info)
 643 {
 644         unsigned long flags;
 645
 646         if (!timewait_info->inserted_remote_id &&
 647             !timewait_info->inserted_remote_qp)
 648             return;
 649
 650         spin_lock_irqsave(&cm.lock, flags);
 651         if (timewait_info->inserted_remote_id) {
 652                 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table);
 653                 timewait_info->inserted_remote_id = 0;
 654         }
 655
 656         if (timewait_info->inserted_remote_qp) {
 657                 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table);
 658                 timewait_info->inserted_remote_qp = 0;
 659         }
 660         spin_unlock_irqrestore(&cm.lock, flags);
 661 }
 662
 663 static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id)
 664 {
 665         struct cm_timewait_info *timewait_info;
 666
 667         timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL);
 668         if (!timewait_info)
 669                 return ERR_PTR(-ENOMEM);
 670
 671         timewait_info->work.local_id = local_id;
 672         INIT_WORK(&timewait_info->work.work, cm_work_handler,
 673                   &timewait_info->work);
 674         timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT;
 675         return timewait_info;
 676 }
 677
 678 static void cm_enter_timewait(struct cm_id_private *cm_id_priv)
 679 {
 680         int wait_time;
 681
 682         /*
 683          * The cm_id could be destroyed by the user before we exit timewait.
 684          * To protect against this, we search for the cm_id after exiting
 685          * timewait before notifying the user that we've exited timewait.
 686          */
 687         cm_id_priv->id.state = IB_CM_TIMEWAIT;
 688         wait_time = cm_convert_to_ms(cm_id_priv->local_ack_timeout);
 689         queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work,
 690                            msecs_to_jiffies(wait_time));
 691         cm_id_priv->timewait_info = NULL;
 692 }
 693
 694 static void cm_reset_to_idle(struct cm_id_private *cm_id_priv)
 695 {
 696         cm_id_priv->id.state = IB_CM_IDLE;
 697         if (cm_id_priv->timewait_info) {
 698                 cm_cleanup_timewait(cm_id_priv->timewait_info);
 699                 kfree(cm_id_priv->timewait_info);
 700                 cm_id_priv->timewait_info = NULL;
 701         }
 702 }
 703
 704 void ib_destroy_cm_id(struct ib_cm_id *cm_id)
 705 {
 706         struct cm_id_private *cm_id_priv;
 707         struct cm_work *work;
 708         unsigned long flags;
 709
 710         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
 711 retest:
 712         spin_lock_irqsave(&cm_id_priv->lock, flags);
 713         switch (cm_id->state) {
 714         case IB_CM_LISTEN:
 715                 cm_id->state = IB_CM_IDLE;
 716                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 717                 spin_lock_irqsave(&cm.lock, flags);
 718                 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table);
 719                 spin_unlock_irqrestore(&cm.lock, flags);
 720                 break;
 721         case IB_CM_SIDR_REQ_SENT:
 722                 cm_id->state = IB_CM_IDLE;
 723                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
 724                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 725                 break;
 726         case IB_CM_SIDR_REQ_RCVD:
 727                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 728                 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT);
 729                 break;
 730         case IB_CM_REQ_SENT:
 731                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
 732                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 733                 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT,
 734                                &cm_id_priv->av.port->cm_dev->ca_guid,
 735                                sizeof cm_id_priv->av.port->cm_dev->ca_guid,
 736                                NULL, 0);
 737                 break;
 738         case IB_CM_MRA_REQ_RCVD:
 739         case IB_CM_REP_SENT:
 740         case IB_CM_MRA_REP_RCVD:
 741                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
 742                 /* Fall through */
 743         case IB_CM_REQ_RCVD:
 744         case IB_CM_MRA_REQ_SENT:
 745         case IB_CM_REP_RCVD:
 746         case IB_CM_MRA_REP_SENT:
 747                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 748                 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
 749                                NULL, 0, NULL, 0);
 750                 break;
 751         case IB_CM_ESTABLISHED:
 752                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 753                 ib_send_cm_dreq(cm_id, NULL, 0);
 754                 goto retest;
 755         case IB_CM_DREQ_SENT:
 756                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
 757                 cm_enter_timewait(cm_id_priv);
 758                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 759                 break;
 760         case IB_CM_DREQ_RCVD:
 761                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 762                 ib_send_cm_drep(cm_id, NULL, 0);
 763                 break;
 764         default:
 765                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 766                 break;
 767         }
 768
 769         cm_free_id(cm_id->local_id);
 770         cm_deref_id(cm_id_priv);
 771         wait_for_completion(&cm_id_priv->comp);
 772         while ((work = cm_dequeue_work(cm_id_priv)) != NULL)
 773                 cm_free_work(work);
 774         kfree(cm_id_priv->compare_data);
 775         kfree(cm_id_priv->private_data);
 776         kfree(cm_id_priv);
 777 }
 778 EXPORT_SYMBOL(ib_destroy_cm_id);
 779
 780 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask,
 781                  struct ib_cm_compare_data *compare_data)
 782 {
 783         struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
 784         unsigned long flags;
 785         int ret = 0;
 786
 787         service_mask = service_mask ? service_mask :
 788                        __constant_cpu_to_be64(~0ULL);
 789         service_id &= service_mask;
 790         if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID &&
 791             (service_id != IB_CM_ASSIGN_SERVICE_ID))
 792                 return -EINVAL;
 793
 794         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
 795         if (cm_id->state != IB_CM_IDLE)
 796                 return -EINVAL;
 797
 798         if (compare_data) {
 799                 cm_id_priv->compare_data = kzalloc(sizeof *compare_data,
 800                                                    GFP_KERNEL);
 801                 if (!cm_id_priv->compare_data)
 802                         return -ENOMEM;
 803                 cm_mask_copy(cm_id_priv->compare_data->data,
 804                              compare_data->data, compare_data->mask);
 805                 memcpy(cm_id_priv->compare_data->mask, compare_data->mask,
 806                        IB_CM_COMPARE_SIZE);
 807         }
 808
 809         cm_id->state = IB_CM_LISTEN;
 810
 811         spin_lock_irqsave(&cm.lock, flags);
 812         if (service_id == IB_CM_ASSIGN_SERVICE_ID) {
 813                 cm_id->service_id = cpu_to_be64(cm.listen_service_id++);
 814                 cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
 815         } else {
 816                 cm_id->service_id = service_id;
 817                 cm_id->service_mask = service_mask;
 818         }
 819         cur_cm_id_priv = cm_insert_listen(cm_id_priv);
 820         spin_unlock_irqrestore(&cm.lock, flags);
 821
 822         if (cur_cm_id_priv) {
 823                 cm_id->state = IB_CM_IDLE;
 824                 kfree(cm_id_priv->compare_data);
 825                 cm_id_priv->compare_data = NULL;
 826                 ret = -EBUSY;
 827         }
 828         return ret;
 829 }
 830 EXPORT_SYMBOL(ib_cm_listen);
 831
 832 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv,
 833                           enum cm_msg_sequence msg_seq)
 834 {
 835         u64 hi_tid, low_tid;
 836
 837         hi_tid   = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32;
 838         low_tid  = (u64) ((__force u32)cm_id_priv->id.local_id |
 839                           (msg_seq << 30));
 840         return cpu_to_be64(hi_tid | low_tid);
 841 }
 842
 843 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr,
 844                               __be16 attr_id, __be64 tid)
 845 {
 846         hdr->base_version  = IB_MGMT_BASE_VERSION;
 847         hdr->mgmt_class    = IB_MGMT_CLASS_CM;
 848         hdr->class_version = IB_CM_CLASS_VERSION;
 849         hdr->method        = IB_MGMT_METHOD_SEND;
 850         hdr->attr_id       = attr_id;
 851         hdr->tid           = tid;
 852 }
 853
 854 static void cm_format_req(struct cm_req_msg *req_msg,
 855                           struct cm_id_private *cm_id_priv,
 856                           struct ib_cm_req_param *param)
 857 {
 858         cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID,
 859                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ));
 860
 861         req_msg->local_comm_id = cm_id_priv->id.local_id;
 862         req_msg->service_id = param->service_id;
 863         req_msg->local_ca_guid = cm_id_priv->av.port->cm_dev->ca_guid;
 864         cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num));
 865         cm_req_set_resp_res(req_msg, param->responder_resources);
 866         cm_req_set_init_depth(req_msg, param->initiator_depth);
 867         cm_req_set_remote_resp_timeout(req_msg,
 868                                        param->remote_cm_response_timeout);
 869         cm_req_set_qp_type(req_msg, param->qp_type);
 870         cm_req_set_flow_ctrl(req_msg, param->flow_control);
 871         cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn));
 872         cm_req_set_local_resp_timeout(req_msg,
 873                                       param->local_cm_response_timeout);
 874         cm_req_set_retry_count(req_msg, param->retry_count);
 875         req_msg->pkey = param->primary_path->pkey;
 876         cm_req_set_path_mtu(req_msg, param->primary_path->mtu);
 877         cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count);
 878         cm_req_set_max_cm_retries(req_msg, param->max_cm_retries);
 879         cm_req_set_srq(req_msg, param->srq);
 880
 881         req_msg->primary_local_lid = param->primary_path->slid;
 882         req_msg->primary_remote_lid = param->primary_path->dlid;
 883         req_msg->primary_local_gid = param->primary_path->sgid;
 884         req_msg->primary_remote_gid = param->primary_path->dgid;
 885         cm_req_set_primary_flow_label(req_msg, param->primary_path->flow_label);
 886         cm_req_set_primary_packet_rate(req_msg, param->primary_path->rate);
 887         req_msg->primary_traffic_class = param->primary_path->traffic_class;
 888         req_msg->primary_hop_limit = param->primary_path->hop_limit;
 889         cm_req_set_primary_sl(req_msg, param->primary_path->sl);
 890         cm_req_set_primary_subnet_local(req_msg, 1); /* local only... */
 891         cm_req_set_primary_local_ack_timeout(req_msg,
 892                 min(31, param->primary_path->packet_life_time + 1));
 893
 894         if (param->alternate_path) {
 895                 req_msg->alt_local_lid = param->alternate_path->slid;
 896                 req_msg->alt_remote_lid = param->alternate_path->dlid;
 897                 req_msg->alt_local_gid = param->alternate_path->sgid;
 898                 req_msg->alt_remote_gid = param->alternate_path->dgid;
 899                 cm_req_set_alt_flow_label(req_msg,
 900                                           param->alternate_path->flow_label);
 901                 cm_req_set_alt_packet_rate(req_msg, param->alternate_path->rate);
 902                 req_msg->alt_traffic_class = param->alternate_path->traffic_class;
 903                 req_msg->alt_hop_limit = param->alternate_path->hop_limit;
 904                 cm_req_set_alt_sl(req_msg, param->alternate_path->sl);
 905                 cm_req_set_alt_subnet_local(req_msg, 1); /* local only... */
 906                 cm_req_set_alt_local_ack_timeout(req_msg,
 907                         min(31, param->alternate_path->packet_life_time + 1));
 908         }
 909
 910         if (param->private_data && param->private_data_len)
 911                 memcpy(req_msg->private_data, param->private_data,
 912                        param->private_data_len);
 913 }
 914
 915 static int cm_validate_req_param(struct ib_cm_req_param *param)
 916 {
 917         /* peer-to-peer not supported */
 918         if (param->peer_to_peer)
 919                 return -EINVAL;
 920
 921         if (!param->primary_path)
 922                 return -EINVAL;
 923
 924         if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC)
 925                 return -EINVAL;
 926
 927         if (param->private_data &&
 928             param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE)
 929                 return -EINVAL;
 930
 931         if (param->alternate_path &&
 932             (param->alternate_path->pkey != param->primary_path->pkey ||
 933              param->alternate_path->mtu != param->primary_path->mtu))
 934                 return -EINVAL;
 935
 936         return 0;
 937 }
 938
 939 int ib_send_cm_req(struct ib_cm_id *cm_id,
 940                    struct ib_cm_req_param *param)
 941 {
 942         struct cm_id_private *cm_id_priv;
 943         struct cm_req_msg *req_msg;
 944         unsigned long flags;
 945         int ret;
 946
 947         ret = cm_validate_req_param(param);
 948         if (ret)
 949                 return ret;
 950
 951         /* Verify that we're not in timewait. */
 952         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
 953         spin_lock_irqsave(&cm_id_priv->lock, flags);
 954         if (cm_id->state != IB_CM_IDLE) {
 955                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 956                 ret = -EINVAL;
 957                 goto out;
 958         }
 959         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 960
 961         cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
 962                                                             id.local_id);
 963         if (IS_ERR(cm_id_priv->timewait_info))
 964                 goto out;
 965
 966         ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av);
 967         if (ret)
 968                 goto error1;
 969         if (param->alternate_path) {
 970                 ret = cm_init_av_by_path(param->alternate_path,
 971                                          &cm_id_priv->alt_av);
 972                 if (ret)
 973                         goto error1;
 974         }
 975         cm_id->service_id = param->service_id;
 976         cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
 977         cm_id_priv->timeout_ms = cm_convert_to_ms(
 978                                     param->primary_path->packet_life_time) * 2 +
 979                                  cm_convert_to_ms(
 980                                     param->remote_cm_response_timeout);
 981         cm_id_priv->max_cm_retries = param->max_cm_retries;
 982         cm_id_priv->initiator_depth = param->initiator_depth;
 983         cm_id_priv->responder_resources = param->responder_resources;
 984         cm_id_priv->retry_count = param->retry_count;
 985         cm_id_priv->path_mtu = param->primary_path->mtu;
 986         cm_id_priv->qp_type = param->qp_type;
 987
 988         ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg);
 989         if (ret)
 990                 goto error1;
 991
 992         req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad;
 993         cm_format_req(req_msg, cm_id_priv, param);
 994         cm_id_priv->tid = req_msg->hdr.tid;
 995         cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms;
 996         cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT;
 997
 998         cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg);
 999         cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg);
1000         cm_id_priv->local_ack_timeout =
1001                                 cm_req_get_primary_local_ack_timeout(req_msg);
1002
1003         spin_lock_irqsave(&cm_id_priv->lock, flags);
1004         ret = ib_post_send_mad(cm_id_priv->msg, NULL);
1005         if (ret) {
1006                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1007                 goto error2;
1008         }
1009         BUG_ON(cm_id->state != IB_CM_IDLE);
1010         cm_id->state = IB_CM_REQ_SENT;
1011         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1012         return 0;
1013
1014 error2: cm_free_msg(cm_id_priv->msg);
1015 error1: kfree(cm_id_priv->timewait_info);
1016 out:    return ret;
1017 }
1018 EXPORT_SYMBOL(ib_send_cm_req);
1019
1020 static int cm_issue_rej(struct cm_port *port,
1021                         struct ib_mad_recv_wc *mad_recv_wc,
1022                         enum ib_cm_rej_reason reason,
1023                         enum cm_msg_response msg_rejected,
1024                         void *ari, u8 ari_length)
1025 {
1026         struct ib_mad_send_buf *msg = NULL;
1027         struct cm_rej_msg *rej_msg, *rcv_msg;
1028         int ret;
1029
1030         ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
1031         if (ret)
1032                 return ret;
1033
1034         /* We just need common CM header information.  Cast to any message. */
1035         rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad;
1036         rej_msg = (struct cm_rej_msg *) msg->mad;
1037
1038         cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid);
1039         rej_msg->remote_comm_id = rcv_msg->local_comm_id;
1040         rej_msg->local_comm_id = rcv_msg->remote_comm_id;
1041         cm_rej_set_msg_rejected(rej_msg, msg_rejected);
1042         rej_msg->reason = cpu_to_be16(reason);
1043
1044         if (ari && ari_length) {
1045                 cm_rej_set_reject_info_len(rej_msg, ari_length);
1046                 memcpy(rej_msg->ari, ari, ari_length);
1047         }
1048
1049         ret = ib_post_send_mad(msg, NULL);
1050         if (ret)
1051                 cm_free_msg(msg);
1052
1053         return ret;
1054 }
1055
1056 static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid,
1057                                     __be32 local_qpn, __be32 remote_qpn)
1058 {
1059         return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) ||
1060                 ((local_ca_guid == remote_ca_guid) &&
1061                  (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn))));
1062 }
1063
1064 static void cm_format_paths_from_req(struct cm_req_msg *req_msg,
1065                                             struct ib_sa_path_rec *primary_path,
1066                                             struct ib_sa_path_rec *alt_path)
1067 {
1068         memset(primary_path, 0, sizeof *primary_path);
1069         primary_path->dgid = req_msg->primary_local_gid;
1070         primary_path->sgid = req_msg->primary_remote_gid;
1071         primary_path->dlid = req_msg->primary_local_lid;
1072         primary_path->slid = req_msg->primary_remote_lid;
1073         primary_path->flow_label = cm_req_get_primary_flow_label(req_msg);
1074         primary_path->hop_limit = req_msg->primary_hop_limit;
1075         primary_path->traffic_class = req_msg->primary_traffic_class;
1076         primary_path->reversible = 1;
1077         primary_path->pkey = req_msg->pkey;
1078         primary_path->sl = cm_req_get_primary_sl(req_msg);
1079         primary_path->mtu_selector = IB_SA_EQ;
1080         primary_path->mtu = cm_req_get_path_mtu(req_msg);
1081         primary_path->rate_selector = IB_SA_EQ;
1082         primary_path->rate = cm_req_get_primary_packet_rate(req_msg);
1083         primary_path->packet_life_time_selector = IB_SA_EQ;
1084         primary_path->packet_life_time =
1085                 cm_req_get_primary_local_ack_timeout(req_msg);
1086         primary_path->packet_life_time -= (primary_path->packet_life_time > 0);
1087
1088         if (req_msg->alt_local_lid) {
1089                 memset(alt_path, 0, sizeof *alt_path);
1090                 alt_path->dgid = req_msg->alt_local_gid;
1091                 alt_path->sgid = req_msg->alt_remote_gid;
1092                 alt_path->dlid = req_msg->alt_local_lid;
1093                 alt_path->slid = req_msg->alt_remote_lid;
1094                 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg);
1095                 alt_path->hop_limit = req_msg->alt_hop_limit;
1096                 alt_path->traffic_class = req_msg->alt_traffic_class;
1097                 alt_path->reversible = 1;
1098                 alt_path->pkey = req_msg->pkey;
1099                 alt_path->sl = cm_req_get_alt_sl(req_msg);
1100                 alt_path->mtu_selector = IB_SA_EQ;
1101                 alt_path->mtu = cm_req_get_path_mtu(req_msg);
1102                 alt_path->rate_selector = IB_SA_EQ;
1103                 alt_path->rate = cm_req_get_alt_packet_rate(req_msg);
1104                 alt_path->packet_life_time_selector = IB_SA_EQ;
1105                 alt_path->packet_life_time =
1106                         cm_req_get_alt_local_ack_timeout(req_msg);
1107                 alt_path->packet_life_time -= (alt_path->packet_life_time > 0);
1108         }
1109 }
1110
1111 static void cm_format_req_event(struct cm_work *work,
1112                                 struct cm_id_private *cm_id_priv,
1113                                 struct ib_cm_id *listen_id)
1114 {
1115         struct cm_req_msg *req_msg;
1116         struct ib_cm_req_event_param *param;
1117
1118         req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1119         param = &work->cm_event.param.req_rcvd;
1120         param->listen_id = listen_id;
1121         param->port = cm_id_priv->av.port->port_num;
1122         param->primary_path = &work->path[0];
1123         if (req_msg->alt_local_lid)
1124                 param->alternate_path = &work->path[1];
1125         else
1126                 param->alternate_path = NULL;
1127         param->remote_ca_guid = req_msg->local_ca_guid;
1128         param->remote_qkey = be32_to_cpu(req_msg->local_qkey);
1129         param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg));
1130         param->qp_type = cm_req_get_qp_type(req_msg);
1131         param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg));
1132         param->responder_resources = cm_req_get_init_depth(req_msg);
1133         param->initiator_depth = cm_req_get_resp_res(req_msg);
1134         param->local_cm_response_timeout =
1135                                         cm_req_get_remote_resp_timeout(req_msg);
1136         param->flow_control = cm_req_get_flow_ctrl(req_msg);
1137         param->remote_cm_response_timeout =
1138                                         cm_req_get_local_resp_timeout(req_msg);
1139         param->retry_count = cm_req_get_retry_count(req_msg);
1140         param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1141         param->srq = cm_req_get_srq(req_msg);
1142         work->cm_event.private_data = &req_msg->private_data;
1143 }
1144
1145 static void cm_process_work(struct cm_id_private *cm_id_priv,
1146                             struct cm_work *work)
1147 {
1148         unsigned long flags;
1149         int ret;
1150
1151         /* We will typically only have the current event to report. */
1152         ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
1153         cm_free_work(work);
1154
1155         while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) {
1156                 spin_lock_irqsave(&cm_id_priv->lock, flags);
1157                 work = cm_dequeue_work(cm_id_priv);
1158                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1159                 BUG_ON(!work);
1160                 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id,
1161                                                 &work->cm_event);
1162                 cm_free_work(work);
1163         }
1164         cm_deref_id(cm_id_priv);
1165         if (ret)
1166                 ib_destroy_cm_id(&cm_id_priv->id);
1167 }
1168
1169 static void cm_format_mra(struct cm_mra_msg *mra_msg,
1170                           struct cm_id_private *cm_id_priv,
1171                           enum cm_msg_response msg_mraed, u8 service_timeout,
1172                           const void *private_data, u8 private_data_len)
1173 {
1174         cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid);
1175         cm_mra_set_msg_mraed(mra_msg, msg_mraed);
1176         mra_msg->local_comm_id = cm_id_priv->id.local_id;
1177         mra_msg->remote_comm_id = cm_id_priv->id.remote_id;
1178         cm_mra_set_service_timeout(mra_msg, service_timeout);
1179
1180         if (private_data && private_data_len)
1181                 memcpy(mra_msg->private_data, private_data, private_data_len);
1182 }
1183
1184 static void cm_format_rej(struct cm_rej_msg *rej_msg,
1185                           struct cm_id_private *cm_id_priv,
1186                           enum ib_cm_rej_reason reason,
1187                           void *ari,
1188                           u8 ari_length,
1189                           const void *private_data,
1190                           u8 private_data_len)
1191 {
1192         cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid);
1193         rej_msg->remote_comm_id = cm_id_priv->id.remote_id;
1194
1195         switch(cm_id_priv->id.state) {
1196         case IB_CM_REQ_RCVD:
1197                 rej_msg->local_comm_id = 0;
1198                 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1199                 break;
1200         case IB_CM_MRA_REQ_SENT:
1201                 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1202                 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1203                 break;
1204         case IB_CM_REP_RCVD:
1205         case IB_CM_MRA_REP_SENT:
1206                 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1207                 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP);
1208                 break;
1209         default:
1210                 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1211                 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER);
1212                 break;
1213         }
1214
1215         rej_msg->reason = cpu_to_be16(reason);
1216         if (ari && ari_length) {
1217                 cm_rej_set_reject_info_len(rej_msg, ari_length);
1218                 memcpy(rej_msg->ari, ari, ari_length);
1219         }
1220
1221         if (private_data && private_data_len)
1222                 memcpy(rej_msg->private_data, private_data, private_data_len);
1223 }
1224
1225 static void cm_dup_req_handler(struct cm_work *work,
1226                                struct cm_id_private *cm_id_priv)
1227 {
1228         struct ib_mad_send_buf *msg = NULL;
1229         unsigned long flags;
1230         int ret;
1231
1232         /* Quick state check to discard duplicate REQs. */
1233         if (cm_id_priv->id.state == IB_CM_REQ_RCVD)
1234                 return;
1235
1236         ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1237         if (ret)
1238                 return;
1239
1240         spin_lock_irqsave(&cm_id_priv->lock, flags);
1241         switch (cm_id_priv->id.state) {
1242         case IB_CM_MRA_REQ_SENT:
1243                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1244                               CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout,
1245                               cm_id_priv->private_data,
1246                               cm_id_priv->private_data_len);
1247                 break;
1248         case IB_CM_TIMEWAIT:
1249                 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv,
1250                               IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0);
1251                 break;
1252         default:
1253                 goto unlock;
1254         }
1255         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1256
1257         ret = ib_post_send_mad(msg, NULL);
1258         if (ret)
1259                 goto free;
1260         return;
1261
1262 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1263 free:   cm_free_msg(msg);
1264 }
1265
1266 static struct cm_id_private * cm_match_req(struct cm_work *work,
1267                                            struct cm_id_private *cm_id_priv)
1268 {
1269         struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv;
1270         struct cm_timewait_info *timewait_info;
1271         struct cm_req_msg *req_msg;
1272         unsigned long flags;
1273
1274         req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1275
1276         /* Check for duplicate REQ and stale connections. */
1277         spin_lock_irqsave(&cm.lock, flags);
1278         timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info);
1279         if (!timewait_info)
1280                 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
1281
1282         if (timewait_info) {
1283                 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
1284                                            timewait_info->work.remote_id);
1285                 spin_unlock_irqrestore(&cm.lock, flags);
1286                 if (cur_cm_id_priv) {
1287                         cm_dup_req_handler(work, cur_cm_id_priv);
1288                         cm_deref_id(cur_cm_id_priv);
1289                 } else
1290                         cm_issue_rej(work->port, work->mad_recv_wc,
1291                                      IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
1292                                      NULL, 0);
1293                 goto error;
1294         }
1295
1296         /* Find matching listen request. */
1297         listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device,
1298                                            req_msg->service_id,
1299                                            req_msg->private_data);
1300         if (!listen_cm_id_priv) {
1301                 spin_unlock_irqrestore(&cm.lock, flags);
1302                 cm_issue_rej(work->port, work->mad_recv_wc,
1303                              IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ,
1304                              NULL, 0);
1305                 goto error;
1306         }
1307         atomic_inc(&listen_cm_id_priv->refcount);
1308         atomic_inc(&cm_id_priv->refcount);
1309         cm_id_priv->id.state = IB_CM_REQ_RCVD;
1310         atomic_inc(&cm_id_priv->work_count);
1311         spin_unlock_irqrestore(&cm.lock, flags);
1312         return listen_cm_id_priv;
1313
1314 error:  cm_cleanup_timewait(cm_id_priv->timewait_info);
1315         return NULL;
1316 }
1317
1318 static int cm_req_handler(struct cm_work *work)
1319 {
1320         struct ib_cm_id *cm_id;
1321         struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
1322         struct cm_req_msg *req_msg;
1323         int ret;
1324
1325         req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1326
1327         cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL);
1328         if (IS_ERR(cm_id))
1329                 return PTR_ERR(cm_id);
1330
1331         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1332         cm_id_priv->id.remote_id = req_msg->local_comm_id;
1333         cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
1334                                 work->mad_recv_wc->recv_buf.grh,
1335                                 &cm_id_priv->av);
1336         cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1337                                                             id.local_id);
1338         if (IS_ERR(cm_id_priv->timewait_info)) {
1339                 ret = PTR_ERR(cm_id_priv->timewait_info);
1340                 goto error1;
1341         }
1342         cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id;
1343         cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid;
1344         cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg);
1345
1346         listen_cm_id_priv = cm_match_req(work, cm_id_priv);
1347         if (!listen_cm_id_priv) {
1348                 ret = -EINVAL;
1349                 goto error2;
1350         }
1351
1352         cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
1353         cm_id_priv->id.context = listen_cm_id_priv->id.context;
1354         cm_id_priv->id.service_id = req_msg->service_id;
1355         cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL);
1356
1357         cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]);
1358         ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av);
1359         if (ret)
1360                 goto error3;
1361         if (req_msg->alt_local_lid) {
1362                 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av);
1363                 if (ret)
1364                         goto error3;
1365         }
1366         cm_id_priv->tid = req_msg->hdr.tid;
1367         cm_id_priv->timeout_ms = cm_convert_to_ms(
1368                                         cm_req_get_local_resp_timeout(req_msg));
1369         cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg);
1370         cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg);
1371         cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg);
1372         cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg);
1373         cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg);
1374         cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg);
1375         cm_id_priv->local_ack_timeout =
1376                                 cm_req_get_primary_local_ack_timeout(req_msg);
1377         cm_id_priv->retry_count = cm_req_get_retry_count(req_msg);
1378         cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1379         cm_id_priv->qp_type = cm_req_get_qp_type(req_msg);
1380
1381         cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
1382         cm_process_work(cm_id_priv, work);
1383         cm_deref_id(listen_cm_id_priv);
1384         return 0;
1385
1386 error3: atomic_dec(&cm_id_priv->refcount);
1387         cm_deref_id(listen_cm_id_priv);
1388         cm_cleanup_timewait(cm_id_priv->timewait_info);
1389 error2: kfree(cm_id_priv->timewait_info);
1390         cm_id_priv->timewait_info = NULL;
1391 error1: ib_destroy_cm_id(&cm_id_priv->id);
1392         return ret;
1393 }
1394
1395 static void cm_format_rep(struct cm_rep_msg *rep_msg,
1396                           struct cm_id_private *cm_id_priv,
1397                           struct ib_cm_rep_param *param)
1398 {
1399         cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid);
1400         rep_msg->local_comm_id = cm_id_priv->id.local_id;
1401         rep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1402         cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num));
1403         cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn));
1404         rep_msg->resp_resources = param->responder_resources;
1405         rep_msg->initiator_depth = param->initiator_depth;
1406         cm_rep_set_target_ack_delay(rep_msg, param->target_ack_delay);
1407         cm_rep_set_failover(rep_msg, param->failover_accepted);
1408         cm_rep_set_flow_ctrl(rep_msg, param->flow_control);
1409         cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count);
1410         cm_rep_set_srq(rep_msg, param->srq);
1411         rep_msg->local_ca_guid = cm_id_priv->av.port->cm_dev->ca_guid;
1412
1413         if (param->private_data && param->private_data_len)
1414                 memcpy(rep_msg->private_data, param->private_data,
1415                        param->private_data_len);
1416 }
1417
1418 int ib_send_cm_rep(struct ib_cm_id *cm_id,
1419                    struct ib_cm_rep_param *param)
1420 {
1421         struct cm_id_private *cm_id_priv;
1422         struct ib_mad_send_buf *msg;
1423         struct cm_rep_msg *rep_msg;
1424         unsigned long flags;
1425         int ret;
1426
1427         if (param->private_data &&
1428             param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE)
1429                 return -EINVAL;
1430
1431         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1432         spin_lock_irqsave(&cm_id_priv->lock, flags);
1433         if (cm_id->state != IB_CM_REQ_RCVD &&
1434             cm_id->state != IB_CM_MRA_REQ_SENT) {
1435                 ret = -EINVAL;
1436                 goto out;
1437         }
1438
1439         ret = cm_alloc_msg(cm_id_priv, &msg);
1440         if (ret)
1441                 goto out;
1442
1443         rep_msg = (struct cm_rep_msg *) msg->mad;
1444         cm_format_rep(rep_msg, cm_id_priv, param);
1445         msg->timeout_ms = cm_id_priv->timeout_ms;
1446         msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;
1447
1448         ret = ib_post_send_mad(msg, NULL);
1449         if (ret) {
1450                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1451                 cm_free_msg(msg);
1452                 return ret;
1453         }
1454
1455         cm_id->state = IB_CM_REP_SENT;
1456         cm_id_priv->msg = msg;
1457         cm_id_priv->initiator_depth = param->initiator_depth;
1458         cm_id_priv->responder_resources = param->responder_resources;
1459         cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg);
1460         cm_id_priv->local_qpn = cm_rep_get_local_qpn(rep_msg);
1461
1462 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1463         return ret;
1464 }
1465 EXPORT_SYMBOL(ib_send_cm_rep);
1466
1467 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg,
1468                           struct cm_id_private *cm_id_priv,
1469                           const void *private_data,
1470                           u8 private_data_len)
1471 {
1472         cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid);
1473         rtu_msg->local_comm_id = cm_id_priv->id.local_id;
1474         rtu_msg->remote_comm_id = cm_id_priv->id.remote_id;
1475
1476         if (private_data && private_data_len)
1477                 memcpy(rtu_msg->private_data, private_data, private_data_len);
1478 }
1479
1480 int ib_send_cm_rtu(struct ib_cm_id *cm_id,
1481                    const void *private_data,
1482                    u8 private_data_len)
1483 {
1484         struct cm_id_private *cm_id_priv;
1485         struct ib_mad_send_buf *msg;
1486         unsigned long flags;
1487         void *data;
1488         int ret;
1489
1490         if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE)
1491                 return -EINVAL;
1492
1493         data = cm_copy_private_data(private_data, private_data_len);
1494         if (IS_ERR(data))
1495                 return PTR_ERR(data);
1496
1497         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1498         spin_lock_irqsave(&cm_id_priv->lock, flags);
1499         if (cm_id->state != IB_CM_REP_RCVD &&
1500             cm_id->state != IB_CM_MRA_REP_SENT) {
1501                 ret = -EINVAL;
1502                 goto error;
1503         }
1504
1505         ret = cm_alloc_msg(cm_id_priv, &msg);
1506         if (ret)
1507                 goto error;
1508
1509         cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1510                       private_data, private_data_len);
1511
1512         ret = ib_post_send_mad(msg, NULL);
1513         if (ret) {
1514                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1515                 cm_free_msg(msg);
1516                 kfree(data);
1517                 return ret;
1518         }
1519
1520         cm_id->state = IB_CM_ESTABLISHED;
1521         cm_set_private_data(cm_id_priv, data, private_data_len);
1522         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1523         return 0;
1524
1525 error:  spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1526         kfree(data);
1527         return ret;
1528 }
1529 EXPORT_SYMBOL(ib_send_cm_rtu);
1530
1531 static void cm_format_rep_event(struct cm_work *work)
1532 {
1533         struct cm_rep_msg *rep_msg;
1534         struct ib_cm_rep_event_param *param;
1535
1536         rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1537         param = &work->cm_event.param.rep_rcvd;
1538         param->remote_ca_guid = rep_msg->local_ca_guid;
1539         param->remote_qkey = be32_to_cpu(rep_msg->local_qkey);
1540         param->remote_qpn = be32_to_cpu(cm_rep_get_local_qpn(rep_msg));
1541         param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg));
1542         param->responder_resources = rep_msg->initiator_depth;
1543         param->initiator_depth = rep_msg->resp_resources;
1544         param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
1545         param->failover_accepted = cm_rep_get_failover(rep_msg);
1546         param->flow_control = cm_rep_get_flow_ctrl(rep_msg);
1547         param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1548         param->srq = cm_rep_get_srq(rep_msg);
1549         work->cm_event.private_data = &rep_msg->private_data;
1550 }
1551
1552 static void cm_dup_rep_handler(struct cm_work *work)
1553 {
1554         struct cm_id_private *cm_id_priv;
1555         struct cm_rep_msg *rep_msg;
1556         struct ib_mad_send_buf *msg = NULL;
1557         unsigned long flags;
1558         int ret;
1559
1560         rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad;
1561         cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id,
1562                                    rep_msg->local_comm_id);
1563         if (!cm_id_priv)
1564                 return;
1565
1566         ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1567         if (ret)
1568                 goto deref;
1569
1570         spin_lock_irqsave(&cm_id_priv->lock, flags);
1571         if (cm_id_priv->id.state == IB_CM_ESTABLISHED)
1572                 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1573                               cm_id_priv->private_data,
1574                               cm_id_priv->private_data_len);
1575         else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT)
1576                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1577                               CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout,
1578                               cm_id_priv->private_data,
1579                               cm_id_priv->private_data_len);
1580         else
1581                 goto unlock;
1582         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1583
1584         ret = ib_post_send_mad(msg, NULL);
1585         if (ret)
1586                 goto free;
1587         goto deref;
1588
1589 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1590 free:   cm_free_msg(msg);
1591 deref:  cm_deref_id(cm_id_priv);
1592 }
1593
1594 static int cm_rep_handler(struct cm_work *work)
1595 {
1596         struct cm_id_private *cm_id_priv;
1597         struct cm_rep_msg *rep_msg;
1598         unsigned long flags;
1599         int ret;
1600
1601         rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1602         cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0);
1603         if (!cm_id_priv) {
1604                 cm_dup_rep_handler(work);
1605                 return -EINVAL;
1606         }
1607
1608         cm_format_rep_event(work);
1609
1610         spin_lock_irqsave(&cm_id_priv->lock, flags);
1611         switch (cm_id_priv->id.state) {
1612         case IB_CM_REQ_SENT:
1613         case IB_CM_MRA_REQ_RCVD:
1614                 break;
1615         default:
1616                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1617                 ret = -EINVAL;
1618                 goto error;
1619         }
1620
1621         cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id;
1622         cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid;
1623         cm_id_priv->timewait_info->remote_qpn = cm_rep_get_local_qpn(rep_msg);
1624
1625         spin_lock(&cm.lock);
1626         /* Check for duplicate REP. */
1627         if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
1628                 spin_unlock(&cm.lock);
1629                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1630                 ret = -EINVAL;
1631                 goto error;
1632         }
1633         /* Check for a stale connection. */
1634         if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) {
1635                 rb_erase(&cm_id_priv->timewait_info->remote_id_node,
1636                          &cm.remote_id_table);
1637                 cm_id_priv->timewait_info->inserted_remote_id = 0;
1638                 spin_unlock(&cm.lock);
1639                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1640                 cm_issue_rej(work->port, work->mad_recv_wc,
1641                              IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP,
1642                              NULL, 0);
1643                 ret = -EINVAL;
1644                 goto error;
1645         }
1646         spin_unlock(&cm.lock);
1647
1648         cm_id_priv->id.state = IB_CM_REP_RCVD;
1649         cm_id_priv->id.remote_id = rep_msg->local_comm_id;
1650         cm_id_priv->remote_qpn = cm_rep_get_local_qpn(rep_msg);
1651         cm_id_priv->initiator_depth = rep_msg->resp_resources;
1652         cm_id_priv->responder_resources = rep_msg->initiator_depth;
1653         cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg);
1654         cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1655
1656         /* todo: handle peer_to_peer */
1657
1658         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1659         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1660         if (!ret)
1661                 list_add_tail(&work->list, &cm_id_priv->work_list);
1662         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1663
1664         if (ret)
1665                 cm_process_work(cm_id_priv, work);
1666         else
1667                 cm_deref_id(cm_id_priv);
1668         return 0;
1669
1670 error:
1671         cm_deref_id(cm_id_priv);
1672         return ret;
1673 }
1674
1675 static int cm_establish_handler(struct cm_work *work)
1676 {
1677         struct cm_id_private *cm_id_priv;
1678         unsigned long flags;
1679         int ret;
1680
1681         /* See comment in ib_cm_establish about lookup. */
1682         cm_id_priv = cm_acquire_id(work->local_id, work->remote_id);
1683         if (!cm_id_priv)
1684                 return -EINVAL;
1685
1686         spin_lock_irqsave(&cm_id_priv->lock, flags);
1687         if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
1688                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1689                 goto out;
1690         }
1691
1692         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1693         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1694         if (!ret)
1695                 list_add_tail(&work->list, &cm_id_priv->work_list);
1696         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1697
1698         if (ret)
1699                 cm_process_work(cm_id_priv, work);
1700         else
1701                 cm_deref_id(cm_id_priv);
1702         return 0;
1703 out:
1704         cm_deref_id(cm_id_priv);
1705         return -EINVAL;
1706 }
1707
1708 static int cm_rtu_handler(struct cm_work *work)
1709 {
1710         struct cm_id_private *cm_id_priv;
1711         struct cm_rtu_msg *rtu_msg;
1712         unsigned long flags;
1713         int ret;
1714
1715         rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad;
1716         cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id,
1717                                    rtu_msg->local_comm_id);
1718         if (!cm_id_priv)
1719                 return -EINVAL;
1720
1721         work->cm_event.private_data = &rtu_msg->private_data;
1722
1723         spin_lock_irqsave(&cm_id_priv->lock, flags);
1724         if (cm_id_priv->id.state != IB_CM_REP_SENT &&
1725             cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
1726                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1727                 goto out;
1728         }
1729         cm_id_priv->id.state = IB_CM_ESTABLISHED;
1730
1731         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1732         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1733         if (!ret)
1734                 list_add_tail(&work->list, &cm_id_priv->work_list);
1735         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1736
1737         if (ret)
1738                 cm_process_work(cm_id_priv, work);
1739         else
1740                 cm_deref_id(cm_id_priv);
1741         return 0;
1742 out:
1743         cm_deref_id(cm_id_priv);
1744         return -EINVAL;
1745 }
1746
1747 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg,
1748                           struct cm_id_private *cm_id_priv,
1749                           const void *private_data,
1750                           u8 private_data_len)
1751 {
1752         cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID,
1753                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ));
1754         dreq_msg->local_comm_id = cm_id_priv->id.local_id;
1755         dreq_msg->remote_comm_id = cm_id_priv->id.remote_id;
1756         cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn);
1757
1758         if (private_data && private_data_len)
1759                 memcpy(dreq_msg->private_data, private_data, private_data_len);
1760 }
1761
1762 int ib_send_cm_dreq(struct ib_cm_id *cm_id,
1763                     const void *private_data,
1764                     u8 private_data_len)
1765 {
1766         struct cm_id_private *cm_id_priv;
1767         struct ib_mad_send_buf *msg;
1768         unsigned long flags;
1769         int ret;
1770
1771         if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE)
1772                 return -EINVAL;
1773
1774         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1775         spin_lock_irqsave(&cm_id_priv->lock, flags);
1776         if (cm_id->state != IB_CM_ESTABLISHED) {
1777                 ret = -EINVAL;
1778                 goto out;
1779         }
1780
1781         ret = cm_alloc_msg(cm_id_priv, &msg);
1782         if (ret) {
1783                 cm_enter_timewait(cm_id_priv);
1784                 goto out;
1785         }
1786
1787         cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv,
1788                        private_data, private_data_len);
1789         msg->timeout_ms = cm_id_priv->timeout_ms;
1790         msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
1791
1792         ret = ib_post_send_mad(msg, NULL);
1793         if (ret) {
1794                 cm_enter_timewait(cm_id_priv);
1795                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1796                 cm_free_msg(msg);
1797                 return ret;
1798         }
1799
1800         cm_id->state = IB_CM_DREQ_SENT;
1801         cm_id_priv->msg = msg;
1802 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1803         return ret;
1804 }
1805 EXPORT_SYMBOL(ib_send_cm_dreq);
1806
1807 static void cm_format_drep(struct cm_drep_msg *drep_msg,
1808                           struct cm_id_private *cm_id_priv,
1809                           const void *private_data,
1810                           u8 private_data_len)
1811 {
1812         cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid);
1813         drep_msg->local_comm_id = cm_id_priv->id.local_id;
1814         drep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1815
1816         if (private_data && private_data_len)
1817                 memcpy(drep_msg->private_data, private_data, private_data_len);
1818 }
1819
1820 int ib_send_cm_drep(struct ib_cm_id *cm_id,
1821                     const void *private_data,
1822                     u8 private_data_len)
1823 {
1824         struct cm_id_private *cm_id_priv;
1825         struct ib_mad_send_buf *msg;
1826         unsigned long flags;
1827         void *data;
1828         int ret;
1829
1830         if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
1831                 return -EINVAL;
1832
1833         data = cm_copy_private_data(private_data, private_data_len);
1834         if (IS_ERR(data))
1835                 return PTR_ERR(data);
1836
1837         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1838         spin_lock_irqsave(&cm_id_priv->lock, flags);
1839         if (cm_id->state != IB_CM_DREQ_RCVD) {
1840                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1841                 kfree(data);
1842                 return -EINVAL;
1843         }
1844
1845         cm_set_private_data(cm_id_priv, data, private_data_len);
1846         cm_enter_timewait(cm_id_priv);
1847
1848         ret = cm_alloc_msg(cm_id_priv, &msg);
1849         if (ret)
1850                 goto out;
1851
1852         cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
1853                        private_data, private_data_len);
1854
1855         ret = ib_post_send_mad(msg, NULL);
1856         if (ret) {
1857                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1858                 cm_free_msg(msg);
1859                 return ret;
1860         }
1861
1862 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1863         return ret;
1864 }
1865 EXPORT_SYMBOL(ib_send_cm_drep);
1866
1867 static int cm_dreq_handler(struct cm_work *work)
1868 {
1869         struct cm_id_private *cm_id_priv;
1870         struct cm_dreq_msg *dreq_msg;
1871         struct ib_mad_send_buf *msg = NULL;
1872         unsigned long flags;
1873         int ret;
1874
1875         dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
1876         cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id,
1877                                    dreq_msg->local_comm_id);
1878         if (!cm_id_priv)
1879                 return -EINVAL;
1880
1881         work->cm_event.private_data = &dreq_msg->private_data;
1882
1883         spin_lock_irqsave(&cm_id_priv->lock, flags);
1884         if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg))
1885                 goto unlock;
1886
1887         switch (cm_id_priv->id.state) {
1888         case IB_CM_REP_SENT:
1889         case IB_CM_DREQ_SENT:
1890                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1891                 break;
1892         case IB_CM_ESTABLISHED:
1893         case IB_CM_MRA_REP_RCVD:
1894                 break;
1895         case IB_CM_TIMEWAIT:
1896                 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
1897                         goto unlock;
1898
1899                 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
1900                                cm_id_priv->private_data,
1901                                cm_id_priv->private_data_len);
1902                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1903
1904                 if (ib_post_send_mad(msg, NULL))
1905                         cm_free_msg(msg);
1906                 goto deref;
1907         default:
1908                 goto unlock;
1909         }
1910         cm_id_priv->id.state = IB_CM_DREQ_RCVD;
1911         cm_id_priv->tid = dreq_msg->hdr.tid;
1912         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1913         if (!ret)
1914                 list_add_tail(&work->list, &cm_id_priv->work_list);
1915         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1916
1917         if (ret)
1918                 cm_process_work(cm_id_priv, work);
1919         else
1920                 cm_deref_id(cm_id_priv);
1921         return 0;
1922
1923 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1924 deref:  cm_deref_id(cm_id_priv);
1925         return -EINVAL;
1926 }
1927
1928 static int cm_drep_handler(struct cm_work *work)
1929 {
1930         struct cm_id_private *cm_id_priv;
1931         struct cm_drep_msg *drep_msg;
1932         unsigned long flags;
1933         int ret;
1934
1935         drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
1936         cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id,
1937                                    drep_msg->local_comm_id);
1938         if (!cm_id_priv)
1939                 return -EINVAL;
1940
1941         work->cm_event.private_data = &drep_msg->private_data;
1942
1943         spin_lock_irqsave(&cm_id_priv->lock, flags);
1944         if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
1945             cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
1946                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1947                 goto out;
1948         }
1949         cm_enter_timewait(cm_id_priv);
1950
1951         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1952         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1953         if (!ret)
1954                 list_add_tail(&work->list, &cm_id_priv->work_list);
1955         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1956
1957         if (ret)
1958                 cm_process_work(cm_id_priv, work);
1959         else
1960                 cm_deref_id(cm_id_priv);
1961         return 0;
1962 out:
1963         cm_deref_id(cm_id_priv);
1964         return -EINVAL;
1965 }
1966
1967 int ib_send_cm_rej(struct ib_cm_id *cm_id,
1968                    enum ib_cm_rej_reason reason,
1969                    void *ari,
1970                    u8 ari_length,
1971                    const void *private_data,
1972                    u8 private_data_len)
1973 {
1974         struct cm_id_private *cm_id_priv;
1975         struct ib_mad_send_buf *msg;
1976         unsigned long flags;
1977         int ret;
1978
1979         if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
1980             (ari && ari_length > IB_CM_REJ_ARI_LENGTH))
1981                 return -EINVAL;
1982
1983         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1984
1985         spin_lock_irqsave(&cm_id_priv->lock, flags);
1986         switch (cm_id->state) {
1987         case IB_CM_REQ_SENT:
1988         case IB_CM_MRA_REQ_RCVD:
1989         case IB_CM_REQ_RCVD:
1990         case IB_CM_MRA_REQ_SENT:
1991         case IB_CM_REP_RCVD:
1992         case IB_CM_MRA_REP_SENT:
1993                 ret = cm_alloc_msg(cm_id_priv, &msg);
1994                 if (!ret)
1995                         cm_format_rej((struct cm_rej_msg *) msg->mad,
1996                                       cm_id_priv, reason, ari, ari_length,
1997                                       private_data, private_data_len);
1998
1999                 cm_reset_to_idle(cm_id_priv);
2000                 break;
2001         case IB_CM_REP_SENT:
2002         case IB_CM_MRA_REP_RCVD:
2003                 ret = cm_alloc_msg(cm_id_priv, &msg);
2004                 if (!ret)
2005                         cm_format_rej((struct cm_rej_msg *) msg->mad,
2006                                       cm_id_priv, reason, ari, ari_length,
2007                                       private_data, private_data_len);
2008
2009                 cm_enter_timewait(cm_id_priv);
2010                 break;
2011         default:
2012                 ret = -EINVAL;
2013                 goto out;
2014         }
2015
2016         if (ret)
2017                 goto out;
2018
2019         ret = ib_post_send_mad(msg, NULL);
2020         if (ret)
2021                 cm_free_msg(msg);
2022
2023 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2024         return ret;
2025 }
2026 EXPORT_SYMBOL(ib_send_cm_rej);
2027
2028 static void cm_format_rej_event(struct cm_work *work)
2029 {
2030         struct cm_rej_msg *rej_msg;
2031         struct ib_cm_rej_event_param *param;
2032
2033         rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2034         param = &work->cm_event.param.rej_rcvd;
2035         param->ari = rej_msg->ari;
2036         param->ari_length = cm_rej_get_reject_info_len(rej_msg);
2037         param->reason = __be16_to_cpu(rej_msg->reason);
2038         work->cm_event.private_data = &rej_msg->private_data;
2039 }
2040
2041 static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
2042 {
2043         struct cm_timewait_info *timewait_info;
2044         struct cm_id_private *cm_id_priv;
2045         unsigned long flags;
2046         __be32 remote_id;
2047
2048         remote_id = rej_msg->local_comm_id;
2049
2050         if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) {
2051                 spin_lock_irqsave(&cm.lock, flags);
2052                 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari),
2053                                                   remote_id);
2054                 if (!timewait_info) {
2055                         spin_unlock_irqrestore(&cm.lock, flags);
2056                         return NULL;
2057                 }
2058                 cm_id_priv = idr_find(&cm.local_id_table,
2059                                       (__force int) timewait_info->work.local_id);
2060                 if (cm_id_priv) {
2061                         if (cm_id_priv->id.remote_id == remote_id)
2062                                 atomic_inc(&cm_id_priv->refcount);
2063                         else
2064                                 cm_id_priv = NULL;
2065                 }
2066                 spin_unlock_irqrestore(&cm.lock, flags);
2067         } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ)
2068                 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0);
2069         else
2070                 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id);
2071
2072         return cm_id_priv;
2073 }
2074
2075 static int cm_rej_handler(struct cm_work *work)
2076 {
2077         struct cm_id_private *cm_id_priv;
2078         struct cm_rej_msg *rej_msg;
2079         unsigned long flags;
2080         int ret;
2081
2082         rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2083         cm_id_priv = cm_acquire_rejected_id(rej_msg);
2084         if (!cm_id_priv)
2085                 return -EINVAL;
2086
2087         cm_format_rej_event(work);
2088
2089         spin_lock_irqsave(&cm_id_priv->lock, flags);
2090         switch (cm_id_priv->id.state) {
2091         case IB_CM_REQ_SENT:
2092         case IB_CM_MRA_REQ_RCVD:
2093         case IB_CM_REP_SENT:
2094         case IB_CM_MRA_REP_RCVD:
2095                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2096                 /* fall through */
2097         case IB_CM_REQ_RCVD:
2098         case IB_CM_MRA_REQ_SENT:
2099                 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN)
2100                         cm_enter_timewait(cm_id_priv);
2101                 else
2102                         cm_reset_to_idle(cm_id_priv);
2103                 break;
2104         case IB_CM_DREQ_SENT:
2105                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2106                 /* fall through */
2107         case IB_CM_REP_RCVD:
2108         case IB_CM_MRA_REP_SENT:
2109         case IB_CM_ESTABLISHED:
2110                 cm_enter_timewait(cm_id_priv);
2111                 break;
2112         default:
2113                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2114                 ret = -EINVAL;
2115                 goto out;
2116         }
2117
2118         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2119         if (!ret)
2120                 list_add_tail(&work->list, &cm_id_priv->work_list);
2121         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2122
2123         if (ret)
2124                 cm_process_work(cm_id_priv, work);
2125         else
2126                 cm_deref_id(cm_id_priv);
2127         return 0;
2128 out:
2129         cm_deref_id(cm_id_priv);
2130         return -EINVAL;
2131 }
2132
2133 int ib_send_cm_mra(struct ib_cm_id *cm_id,
2134                    u8 service_timeout,
2135                    const void *private_data,
2136                    u8 private_data_len)
2137 {
2138         struct cm_id_private *cm_id_priv;
2139         struct ib_mad_send_buf *msg;
2140         void *data;
2141         unsigned long flags;
2142         int ret;
2143
2144         if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE)
2145                 return -EINVAL;
2146
2147         data = cm_copy_private_data(private_data, private_data_len);
2148         if (IS_ERR(data))
2149                 return PTR_ERR(data);
2150
2151         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2152
2153         spin_lock_irqsave(&cm_id_priv->lock, flags);
2154         switch(cm_id_priv->id.state) {
2155         case IB_CM_REQ_RCVD:
2156                 ret = cm_alloc_msg(cm_id_priv, &msg);
2157                 if (ret)
2158                         goto error1;
2159
2160                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2161                               CM_MSG_RESPONSE_REQ, service_timeout,
2162                               private_data, private_data_len);
2163                 ret = ib_post_send_mad(msg, NULL);
2164                 if (ret)
2165                         goto error2;
2166                 cm_id->state = IB_CM_MRA_REQ_SENT;
2167                 break;
2168         case IB_CM_REP_RCVD:
2169                 ret = cm_alloc_msg(cm_id_priv, &msg);
2170                 if (ret)
2171                         goto error1;
2172
2173                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2174                               CM_MSG_RESPONSE_REP, service_timeout,
2175                               private_data, private_data_len);
2176                 ret = ib_post_send_mad(msg, NULL);
2177                 if (ret)
2178                         goto error2;
2179                 cm_id->state = IB_CM_MRA_REP_SENT;
2180                 break;
2181         case IB_CM_ESTABLISHED:
2182                 ret = cm_alloc_msg(cm_id_priv, &msg);
2183                 if (ret)
2184                         goto error1;
2185
2186                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2187                               CM_MSG_RESPONSE_OTHER, service_timeout,
2188                               private_data, private_data_len);
2189                 ret = ib_post_send_mad(msg, NULL);
2190                 if (ret)
2191                         goto error2;
2192                 cm_id->lap_state = IB_CM_MRA_LAP_SENT;
2193                 break;
2194         default:
2195                 ret = -EINVAL;
2196                 goto error1;
2197         }
2198         cm_id_priv->service_timeout = service_timeout;
2199         cm_set_private_data(cm_id_priv, data, private_data_len);
2200         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2201         return 0;
2202
2203 error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2204         kfree(data);
2205         return ret;
2206
2207 error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2208         kfree(data);
2209         cm_free_msg(msg);
2210         return ret;
2211 }
2212 EXPORT_SYMBOL(ib_send_cm_mra);
2213
2214 static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
2215 {
2216         switch (cm_mra_get_msg_mraed(mra_msg)) {
2217         case CM_MSG_RESPONSE_REQ:
2218                 return cm_acquire_id(mra_msg->remote_comm_id, 0);
2219         case CM_MSG_RESPONSE_REP:
2220         case CM_MSG_RESPONSE_OTHER:
2221                 return cm_acquire_id(mra_msg->remote_comm_id,
2222                                      mra_msg->local_comm_id);
2223         default:
2224                 return NULL;
2225         }
2226 }
2227
2228 static int cm_mra_handler(struct cm_work *work)
2229 {
2230         struct cm_id_private *cm_id_priv;
2231         struct cm_mra_msg *mra_msg;
2232         unsigned long flags;
2233         int timeout, ret;
2234
2235         mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
2236         cm_id_priv = cm_acquire_mraed_id(mra_msg);
2237         if (!cm_id_priv)
2238                 return -EINVAL;
2239
2240         work->cm_event.private_data = &mra_msg->private_data;
2241         work->cm_event.param.mra_rcvd.service_timeout =
2242                                         cm_mra_get_service_timeout(mra_msg);
2243         timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) +
2244                   cm_convert_to_ms(cm_id_priv->av.packet_life_time);
2245
2246         spin_lock_irqsave(&cm_id_priv->lock, flags);
2247         switch (cm_id_priv->id.state) {
2248         case IB_CM_REQ_SENT:
2249                 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ ||
2250                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
2251                                   cm_id_priv->msg, timeout))
2252                         goto out;
2253                 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
2254                 break;
2255         case IB_CM_REP_SENT:
2256                 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP ||
2257                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
2258                                   cm_id_priv->msg, timeout))
2259                         goto out;
2260                 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
2261                 break;
2262         case IB_CM_ESTABLISHED:
2263                 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER ||
2264                     cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
2265                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
2266                                   cm_id_priv->msg, timeout))
2267                         goto out;
2268                 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
2269                 break;
2270         default:
2271                 goto out;
2272         }
2273
2274         cm_id_priv->msg->context[1] = (void *) (unsigned long)
2275                                       cm_id_priv->id.state;
2276         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2277         if (!ret)
2278                 list_add_tail(&work->list, &cm_id_priv->work_list);
2279         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2280
2281         if (ret)
2282                 cm_process_work(cm_id_priv, work);
2283         else
2284                 cm_deref_id(cm_id_priv);
2285         return 0;
2286 out:
2287         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2288         cm_deref_id(cm_id_priv);
2289         return -EINVAL;
2290 }
2291
2292 static void cm_format_lap(struct cm_lap_msg *lap_msg,
2293                           struct cm_id_private *cm_id_priv,
2294                           struct ib_sa_path_rec *alternate_path,
2295                           const void *private_data,
2296                           u8 private_data_len)
2297 {
2298         cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID,
2299                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP));
2300         lap_msg->local_comm_id = cm_id_priv->id.local_id;
2301         lap_msg->remote_comm_id = cm_id_priv->id.remote_id;
2302         cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn);
2303         /* todo: need remote CM response timeout */
2304         cm_lap_set_remote_resp_timeout(lap_msg, 0x1F);
2305         lap_msg->alt_local_lid = alternate_path->slid;
2306         lap_msg->alt_remote_lid = alternate_path->dlid;
2307         lap_msg->alt_local_gid = alternate_path->sgid;
2308         lap_msg->alt_remote_gid = alternate_path->dgid;
2309         cm_lap_set_flow_label(lap_msg, alternate_path->flow_label);
2310         cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class);
2311         lap_msg->alt_hop_limit = alternate_path->hop_limit;
2312         cm_lap_set_packet_rate(lap_msg, alternate_path->rate);
2313         cm_lap_set_sl(lap_msg, alternate_path->sl);
2314         cm_lap_set_subnet_local(lap_msg, 1); /* local only... */
2315         cm_lap_set_local_ack_timeout(lap_msg,
2316                 min(31, alternate_path->packet_life_time + 1));
2317
2318         if (private_data && private_data_len)
2319                 memcpy(lap_msg->private_data, private_data, private_data_len);
2320 }
2321
2322 int ib_send_cm_lap(struct ib_cm_id *cm_id,
2323                    struct ib_sa_path_rec *alternate_path,
2324                    const void *private_data,
2325                    u8 private_data_len)
2326 {
2327         struct cm_id_private *cm_id_priv;
2328         struct ib_mad_send_buf *msg;
2329         unsigned long flags;
2330         int ret;
2331
2332         if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE)
2333                 return -EINVAL;
2334
2335         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2336         spin_lock_irqsave(&cm_id_priv->lock, flags);
2337         if (cm_id->state != IB_CM_ESTABLISHED ||
2338             cm_id->lap_state != IB_CM_LAP_IDLE) {
2339                 ret = -EINVAL;
2340                 goto out;
2341         }
2342
2343         ret = cm_alloc_msg(cm_id_priv, &msg);
2344         if (ret)
2345                 goto out;
2346
2347         cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv,
2348                       alternate_path, private_data, private_data_len);
2349         msg->timeout_ms = cm_id_priv->timeout_ms;
2350         msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED;
2351
2352         ret = ib_post_send_mad(msg, NULL);
2353         if (ret) {
2354                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2355                 cm_free_msg(msg);
2356                 return ret;
2357         }
2358
2359         cm_id->lap_state = IB_CM_LAP_SENT;
2360         cm_id_priv->msg = msg;
2361
2362 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2363         return ret;
2364 }
2365 EXPORT_SYMBOL(ib_send_cm_lap);
2366
2367 static void cm_format_path_from_lap(struct ib_sa_path_rec *path,
2368                                     struct cm_lap_msg *lap_msg)
2369 {
2370         memset(path, 0, sizeof *path);
2371         path->dgid = lap_msg->alt_local_gid;
2372         path->sgid = lap_msg->alt_remote_gid;
2373         path->dlid = lap_msg->alt_local_lid;
2374         path->slid = lap_msg->alt_remote_lid;
2375         path->flow_label = cm_lap_get_flow_label(lap_msg);
2376         path->hop_limit = lap_msg->alt_hop_limit;
2377         path->traffic_class = cm_lap_get_traffic_class(lap_msg);
2378         path->reversible = 1;
2379         /* pkey is same as in REQ */
2380         path->sl = cm_lap_get_sl(lap_msg);
2381         path->mtu_selector = IB_SA_EQ;
2382         /* mtu is same as in REQ */
2383         path->rate_selector = IB_SA_EQ;
2384         path->rate = cm_lap_get_packet_rate(lap_msg);
2385         path->packet_life_time_selector = IB_SA_EQ;
2386         path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg);
2387         path->packet_life_time -= (path->packet_life_time > 0);
2388 }
2389
2390 static int cm_lap_handler(struct cm_work *work)
2391 {
2392         struct cm_id_private *cm_id_priv;
2393         struct cm_lap_msg *lap_msg;
2394         struct ib_cm_lap_event_param *param;
2395         struct ib_mad_send_buf *msg = NULL;
2396         unsigned long flags;
2397         int ret;
2398
2399         /* todo: verify LAP request and send reject APR if invalid. */
2400         lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
2401         cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id,
2402                                    lap_msg->local_comm_id);
2403         if (!cm_id_priv)
2404                 return -EINVAL;
2405
2406         param = &work->cm_event.param.lap_rcvd;
2407         param->alternate_path = &work->path[0];
2408         cm_format_path_from_lap(param->alternate_path, lap_msg);
2409         work->cm_event.private_data = &lap_msg->private_data;
2410
2411         spin_lock_irqsave(&cm_id_priv->lock, flags);
2412         if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
2413                 goto unlock;
2414
2415         switch (cm_id_priv->id.lap_state) {
2416         case IB_CM_LAP_IDLE:
2417                 break;
2418         case IB_CM_MRA_LAP_SENT:
2419                 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2420                         goto unlock;
2421
2422                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2423                               CM_MSG_RESPONSE_OTHER,
2424                               cm_id_priv->service_timeout,
2425                               cm_id_priv->private_data,
2426                               cm_id_priv->private_data_len);
2427                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2428
2429                 if (ib_post_send_mad(msg, NULL))
2430                         cm_free_msg(msg);
2431                 goto deref;
2432         default:
2433                 goto unlock;
2434         }
2435
2436         cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
2437         cm_id_priv->tid = lap_msg->hdr.tid;
2438         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2439         if (!ret)
2440                 list_add_tail(&work->list, &cm_id_priv->work_list);
2441         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2442
2443         if (ret)
2444                 cm_process_work(cm_id_priv, work);
2445         else
2446                 cm_deref_id(cm_id_priv);
2447         return 0;
2448
2449 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2450 deref:  cm_deref_id(cm_id_priv);
2451         return -EINVAL;
2452 }
2453
2454 static void cm_format_apr(struct cm_apr_msg *apr_msg,
2455                           struct cm_id_private *cm_id_priv,
2456                           enum ib_cm_apr_status status,
2457                           void *info,
2458                           u8 info_length,
2459                           const void *private_data,
2460                           u8 private_data_len)
2461 {
2462         cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid);
2463         apr_msg->local_comm_id = cm_id_priv->id.local_id;
2464         apr_msg->remote_comm_id = cm_id_priv->id.remote_id;
2465         apr_msg->ap_status = (u8) status;
2466
2467         if (info && info_length) {
2468                 apr_msg->info_length = info_length;
2469                 memcpy(apr_msg->info, info, info_length);
2470         }
2471
2472         if (private_data && private_data_len)
2473                 memcpy(apr_msg->private_data, private_data, private_data_len);
2474 }
2475
2476 int ib_send_cm_apr(struct ib_cm_id *cm_id,
2477                    enum ib_cm_apr_status status,
2478                    void *info,
2479                    u8 info_length,
2480                    const void *private_data,
2481                    u8 private_data_len)
2482 {
2483         struct cm_id_private *cm_id_priv;
2484         struct ib_mad_send_buf *msg;
2485         unsigned long flags;
2486         int ret;
2487
2488         if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) ||
2489             (info && info_length > IB_CM_APR_INFO_LENGTH))
2490                 return -EINVAL;
2491
2492         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2493         spin_lock_irqsave(&cm_id_priv->lock, flags);
2494         if (cm_id->state != IB_CM_ESTABLISHED ||
2495             (cm_id->lap_state != IB_CM_LAP_RCVD &&
2496              cm_id->lap_state != IB_CM_MRA_LAP_SENT)) {
2497                 ret = -EINVAL;
2498                 goto out;
2499         }
2500
2501         ret = cm_alloc_msg(cm_id_priv, &msg);
2502         if (ret)
2503                 goto out;
2504
2505         cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status,
2506                       info, info_length, private_data, private_data_len);
2507         ret = ib_post_send_mad(msg, NULL);
2508         if (ret) {
2509                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2510                 cm_free_msg(msg);
2511                 return ret;
2512         }
2513
2514         cm_id->lap_state = IB_CM_LAP_IDLE;
2515 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2516         return ret;
2517 }
2518 EXPORT_SYMBOL(ib_send_cm_apr);
2519
2520 static int cm_apr_handler(struct cm_work *work)
2521 {
2522         struct cm_id_private *cm_id_priv;
2523         struct cm_apr_msg *apr_msg;
2524         unsigned long flags;
2525         int ret;
2526
2527         apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
2528         cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id,
2529                                    apr_msg->local_comm_id);
2530         if (!cm_id_priv)
2531                 return -EINVAL; /* Unmatched reply. */
2532
2533         work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status;
2534         work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info;
2535         work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length;
2536         work->cm_event.private_data = &apr_msg->private_data;
2537
2538         spin_lock_irqsave(&cm_id_priv->lock, flags);
2539         if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
2540             (cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
2541              cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
2542                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2543                 goto out;
2544         }
2545         cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
2546         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2547         cm_id_priv->msg = NULL;
2548
2549         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2550         if (!ret)
2551                 list_add_tail(&work->list, &cm_id_priv->work_list);
2552         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2553
2554         if (ret)
2555                 cm_process_work(cm_id_priv, work);
2556         else
2557                 cm_deref_id(cm_id_priv);
2558         return 0;
2559 out:
2560         cm_deref_id(cm_id_priv);
2561         return -EINVAL;
2562 }
2563
2564 static int cm_timewait_handler(struct cm_work *work)
2565 {
2566         struct cm_timewait_info *timewait_info;
2567         struct cm_id_private *cm_id_priv;
2568         unsigned long flags;
2569         int ret;
2570
2571         timewait_info = (struct cm_timewait_info *)work;
2572         cm_cleanup_timewait(timewait_info);
2573
2574         cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
2575                                    timewait_info->work.remote_id);
2576         if (!cm_id_priv)
2577                 return -EINVAL;
2578
2579         spin_lock_irqsave(&cm_id_priv->lock, flags);
2580         if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
2581             cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
2582                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2583                 goto out;
2584         }
2585         cm_id_priv->id.state = IB_CM_IDLE;
2586         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2587         if (!ret)
2588                 list_add_tail(&work->list, &cm_id_priv->work_list);
2589         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2590
2591         if (ret)
2592                 cm_process_work(cm_id_priv, work);
2593         else
2594                 cm_deref_id(cm_id_priv);
2595         return 0;
2596 out:
2597         cm_deref_id(cm_id_priv);
2598         return -EINVAL;
2599 }
2600
2601 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
2602                                struct cm_id_private *cm_id_priv,
2603                                struct ib_cm_sidr_req_param *param)
2604 {
2605         cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
2606                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR));
2607         sidr_req_msg->request_id = cm_id_priv->id.local_id;
2608         sidr_req_msg->pkey = cpu_to_be16(param->path->pkey);
2609         sidr_req_msg->service_id = param->service_id;
2610
2611         if (param->private_data && param->private_data_len)
2612                 memcpy(sidr_req_msg->private_data, param->private_data,
2613                        param->private_data_len);
2614 }
2615
2616 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
2617                         struct ib_cm_sidr_req_param *param)
2618 {
2619         struct cm_id_private *cm_id_priv;
2620         struct ib_mad_send_buf *msg;
2621         unsigned long flags;
2622         int ret;
2623
2624         if (!param->path || (param->private_data &&
2625              param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
2626                 return -EINVAL;
2627
2628         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2629         ret = cm_init_av_by_path(param->path, &cm_id_priv->av);
2630         if (ret)
2631                 goto out;
2632
2633         cm_id->service_id = param->service_id;
2634         cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
2635         cm_id_priv->timeout_ms = param->timeout_ms;
2636         cm_id_priv->max_cm_retries = param->max_cm_retries;
2637         ret = cm_alloc_msg(cm_id_priv, &msg);
2638         if (ret)
2639                 goto out;
2640
2641         cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv,
2642                            param);
2643         msg->timeout_ms = cm_id_priv->timeout_ms;
2644         msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT;
2645
2646         spin_lock_irqsave(&cm_id_priv->lock, flags);
2647         if (cm_id->state == IB_CM_IDLE)
2648                 ret = ib_post_send_mad(msg, NULL);
2649         else
2650                 ret = -EINVAL;
2651
2652         if (ret) {
2653                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2654                 cm_free_msg(msg);
2655                 goto out;
2656         }
2657         cm_id->state = IB_CM_SIDR_REQ_SENT;
2658         cm_id_priv->msg = msg;
2659         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2660 out:
2661         return ret;
2662 }
2663 EXPORT_SYMBOL(ib_send_cm_sidr_req);
2664
2665 static void cm_format_sidr_req_event(struct cm_work *work,
2666                                      struct ib_cm_id *listen_id)
2667 {
2668         struct cm_sidr_req_msg *sidr_req_msg;
2669         struct ib_cm_sidr_req_event_param *param;
2670
2671         sidr_req_msg = (struct cm_sidr_req_msg *)
2672                                 work->mad_recv_wc->recv_buf.mad;
2673         param = &work->cm_event.param.sidr_req_rcvd;
2674         param->pkey = __be16_to_cpu(sidr_req_msg->pkey);
2675         param->listen_id = listen_id;
2676         param->port = work->port->port_num;
2677         work->cm_event.private_data = &sidr_req_msg->private_data;
2678 }
2679
2680 static int cm_sidr_req_handler(struct cm_work *work)
2681 {
2682         struct ib_cm_id *cm_id;
2683         struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
2684         struct cm_sidr_req_msg *sidr_req_msg;
2685         struct ib_wc *wc;
2686         unsigned long flags;
2687
2688         cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL);
2689         if (IS_ERR(cm_id))
2690                 return PTR_ERR(cm_id);
2691         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2692
2693         /* Record SGID/SLID and request ID for lookup. */
2694         sidr_req_msg = (struct cm_sidr_req_msg *)
2695                                 work->mad_recv_wc->recv_buf.mad;
2696         wc = work->mad_recv_wc->wc;
2697         cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid);
2698         cm_id_priv->av.dgid.global.interface_id = 0;
2699         cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2700                                 work->mad_recv_wc->recv_buf.grh,
2701                                 &cm_id_priv->av);
2702         cm_id_priv->id.remote_id = sidr_req_msg->request_id;
2703         cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
2704         cm_id_priv->tid = sidr_req_msg->hdr.tid;
2705         atomic_inc(&cm_id_priv->work_count);
2706
2707         spin_lock_irqsave(&cm.lock, flags);
2708         cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
2709         if (cur_cm_id_priv) {
2710                 spin_unlock_irqrestore(&cm.lock, flags);
2711                 goto out; /* Duplicate message. */
2712         }
2713         cur_cm_id_priv = cm_find_listen(cm_id->device,
2714                                         sidr_req_msg->service_id,
2715                                         sidr_req_msg->private_data);
2716         if (!cur_cm_id_priv) {
2717                 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
2718                 spin_unlock_irqrestore(&cm.lock, flags);
2719                 /* todo: reply with no match */
2720                 goto out; /* No match. */
2721         }
2722         atomic_inc(&cur_cm_id_priv->refcount);
2723         spin_unlock_irqrestore(&cm.lock, flags);
2724
2725         cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler;
2726         cm_id_priv->id.context = cur_cm_id_priv->id.context;
2727         cm_id_priv->id.service_id = sidr_req_msg->service_id;
2728         cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL);
2729
2730         cm_format_sidr_req_event(work, &cur_cm_id_priv->id);
2731         cm_process_work(cm_id_priv, work);
2732         cm_deref_id(cur_cm_id_priv);
2733         return 0;
2734 out:
2735         ib_destroy_cm_id(&cm_id_priv->id);
2736         return -EINVAL;
2737 }
2738
2739 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
2740                                struct cm_id_private *cm_id_priv,
2741                                struct ib_cm_sidr_rep_param *param)
2742 {
2743         cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
2744                           cm_id_priv->tid);
2745         sidr_rep_msg->request_id = cm_id_priv->id.remote_id;
2746         sidr_rep_msg->status = param->status;
2747         cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num));
2748         sidr_rep_msg->service_id = cm_id_priv->id.service_id;
2749         sidr_rep_msg->qkey = cpu_to_be32(param->qkey);
2750
2751         if (param->info && param->info_length)
2752                 memcpy(sidr_rep_msg->info, param->info, param->info_length);
2753
2754         if (param->private_data && param->private_data_len)
2755                 memcpy(sidr_rep_msg->private_data, param->private_data,
2756                        param->private_data_len);
2757 }
2758
2759 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
2760                         struct ib_cm_sidr_rep_param *param)
2761 {
2762         struct cm_id_private *cm_id_priv;
2763         struct ib_mad_send_buf *msg;
2764         unsigned long flags;
2765         int ret;
2766
2767         if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
2768             (param->private_data &&
2769              param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE))
2770                 return -EINVAL;
2771
2772         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2773         spin_lock_irqsave(&cm_id_priv->lock, flags);
2774         if (cm_id->state != IB_CM_SIDR_REQ_RCVD) {
2775                 ret = -EINVAL;
2776                 goto error;
2777         }
2778
2779         ret = cm_alloc_msg(cm_id_priv, &msg);
2780         if (ret)
2781                 goto error;
2782
2783         cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
2784                            param);
2785         ret = ib_post_send_mad(msg, NULL);
2786         if (ret) {
2787                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2788                 cm_free_msg(msg);
2789                 return ret;
2790         }
2791         cm_id->state = IB_CM_IDLE;
2792         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2793
2794         spin_lock_irqsave(&cm.lock, flags);
2795         rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
2796         spin_unlock_irqrestore(&cm.lock, flags);
2797         return 0;
2798
2799 error:  spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2800         return ret;
2801 }
2802 EXPORT_SYMBOL(ib_send_cm_sidr_rep);
2803
2804 static void cm_format_sidr_rep_event(struct cm_work *work)
2805 {
2806         struct cm_sidr_rep_msg *sidr_rep_msg;
2807         struct ib_cm_sidr_rep_event_param *param;
2808
2809         sidr_rep_msg = (struct cm_sidr_rep_msg *)
2810                                 work->mad_recv_wc->recv_buf.mad;
2811         param = &work->cm_event.param.sidr_rep_rcvd;
2812         param->status = sidr_rep_msg->status;
2813         param->qkey = be32_to_cpu(sidr_rep_msg->qkey);
2814         param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg));
2815         param->info = &sidr_rep_msg->info;
2816         param->info_len = sidr_rep_msg->info_length;
2817         work->cm_event.private_data = &sidr_rep_msg->private_data;
2818 }
2819
2820 static int cm_sidr_rep_handler(struct cm_work *work)
2821 {
2822         struct cm_sidr_rep_msg *sidr_rep_msg;
2823         struct cm_id_private *cm_id_priv;
2824         unsigned long flags;
2825
2826         sidr_rep_msg = (struct cm_sidr_rep_msg *)
2827                                 work->mad_recv_wc->recv_buf.mad;
2828         cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0);
2829         if (!cm_id_priv)
2830                 return -EINVAL; /* Unmatched reply. */
2831
2832         spin_lock_irqsave(&cm_id_priv->lock, flags);
2833         if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
2834                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2835                 goto out;
2836         }
2837         cm_id_priv->id.state = IB_CM_IDLE;
2838         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2839         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2840
2841         cm_format_sidr_rep_event(work);
2842         cm_process_work(cm_id_priv, work);
2843         return 0;
2844 out:
2845         cm_deref_id(cm_id_priv);
2846         return -EINVAL;
2847 }
2848
2849 static void cm_process_send_error(struct ib_mad_send_buf *msg,
2850                                   enum ib_wc_status wc_status)
2851 {
2852         struct cm_id_private *cm_id_priv;
2853         struct ib_cm_event cm_event;
2854         enum ib_cm_state state;
2855         unsigned long flags;
2856         int ret;
2857
2858         memset(&cm_event, 0, sizeof cm_event);
2859         cm_id_priv = msg->context[0];
2860
2861         /* Discard old sends or ones without a response. */
2862         spin_lock_irqsave(&cm_id_priv->lock, flags);
2863         state = (enum ib_cm_state) (unsigned long) msg->context[1];
2864         if (msg != cm_id_priv->msg || state != cm_id_priv->id.state)
2865                 goto discard;
2866
2867         switch (state) {
2868         case IB_CM_REQ_SENT:
2869         case IB_CM_MRA_REQ_RCVD:
2870                 cm_reset_to_idle(cm_id_priv);
2871                 cm_event.event = IB_CM_REQ_ERROR;
2872                 break;
2873         case IB_CM_REP_SENT:
2874         case IB_CM_MRA_REP_RCVD:
2875                 cm_reset_to_idle(cm_id_priv);
2876                 cm_event.event = IB_CM_REP_ERROR;
2877                 break;
2878         case IB_CM_DREQ_SENT:
2879                 cm_enter_timewait(cm_id_priv);
2880                 cm_event.event = IB_CM_DREQ_ERROR;
2881                 break;
2882         case IB_CM_SIDR_REQ_SENT:
2883                 cm_id_priv->id.state = IB_CM_IDLE;
2884                 cm_event.event = IB_CM_SIDR_REQ_ERROR;
2885                 break;
2886         default:
2887                 goto discard;
2888         }
2889         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2890         cm_event.param.send_status = wc_status;
2891
2892         /* No other events can occur on the cm_id at this point. */
2893         ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
2894         cm_free_msg(msg);
2895         if (ret)
2896                 ib_destroy_cm_id(&cm_id_priv->id);
2897         return;
2898 discard:
2899         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2900         cm_free_msg(msg);
2901 }
2902
2903 static void cm_send_handler(struct ib_mad_agent *mad_agent,
2904                             struct ib_mad_send_wc *mad_send_wc)
2905 {
2906         struct ib_mad_send_buf *msg = mad_send_wc->send_buf;
2907
2908         switch (mad_send_wc->status) {
2909         case IB_WC_SUCCESS:
2910         case IB_WC_WR_FLUSH_ERR:
2911                 cm_free_msg(msg);
2912                 break;
2913         default:
2914                 if (msg->context[0] && msg->context[1])
2915                         cm_process_send_error(msg, mad_send_wc->status);
2916                 else
2917                         cm_free_msg(msg);
2918                 break;
2919         }
2920 }
2921
2922 static void cm_work_handler(void *data)
2923 {
2924         struct cm_work *work = data;
2925         int ret;
2926
2927         switch (work->cm_event.event) {
2928         case IB_CM_REQ_RECEIVED:
2929                 ret = cm_req_handler(work);
2930                 break;
2931         case IB_CM_MRA_RECEIVED:
2932                 ret = cm_mra_handler(work);
2933                 break;
2934         case IB_CM_REJ_RECEIVED:
2935                 ret = cm_rej_handler(work);
2936                 break;
2937         case IB_CM_REP_RECEIVED:
2938                 ret = cm_rep_handler(work);
2939                 break;
2940         case IB_CM_RTU_RECEIVED:
2941                 ret = cm_rtu_handler(work);
2942                 break;
2943         case IB_CM_USER_ESTABLISHED:
2944                 ret = cm_establish_handler(work);
2945                 break;
2946         case IB_CM_DREQ_RECEIVED:
2947                 ret = cm_dreq_handler(work);
2948                 break;
2949         case IB_CM_DREP_RECEIVED:
2950                 ret = cm_drep_handler(work);
2951                 break;
2952         case IB_CM_SIDR_REQ_RECEIVED:
2953                 ret = cm_sidr_req_handler(work);
2954                 break;
2955         case IB_CM_SIDR_REP_RECEIVED:
2956                 ret = cm_sidr_rep_handler(work);
2957                 break;
2958         case IB_CM_LAP_RECEIVED:
2959                 ret = cm_lap_handler(work);
2960                 break;
2961         case IB_CM_APR_RECEIVED:
2962                 ret = cm_apr_handler(work);
2963                 break;
2964         case IB_CM_TIMEWAIT_EXIT:
2965                 ret = cm_timewait_handler(work);
2966                 break;
2967         default:
2968                 ret = -EINVAL;
2969                 break;
2970         }
2971         if (ret)
2972                 cm_free_work(work);
2973 }
2974
2975 int ib_cm_establish(struct ib_cm_id *cm_id)
2976 {
2977         struct cm_id_private *cm_id_priv;
2978         struct cm_work *work;
2979         unsigned long flags;
2980         int ret = 0;
2981
2982         work = kmalloc(sizeof *work, GFP_ATOMIC);
2983         if (!work)
2984                 return -ENOMEM;
2985
2986         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2987         spin_lock_irqsave(&cm_id_priv->lock, flags);
2988         switch (cm_id->state)
2989         {
2990         case IB_CM_REP_SENT:
2991         case IB_CM_MRA_REP_RCVD:
2992                 cm_id->state = IB_CM_ESTABLISHED;
2993                 break;
2994         case IB_CM_ESTABLISHED:
2995                 ret = -EISCONN;
2996                 break;
2997         default:
2998                 ret = -EINVAL;
2999                 break;
3000         }
3001         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3002
3003         if (ret) {
3004                 kfree(work);
3005                 goto out;
3006         }
3007
3008         /*
3009          * The CM worker thread may try to destroy the cm_id before it
3010          * can execute this work item.  To prevent potential deadlock,
3011          * we need to find the cm_id once we're in the context of the
3012          * worker thread, rather than holding a reference on it.
3013          */
3014         INIT_WORK(&work->work, cm_work_handler, work);
3015         work->local_id = cm_id->local_id;
3016         work->remote_id = cm_id->remote_id;
3017         work->mad_recv_wc = NULL;
3018         work->cm_event.event = IB_CM_USER_ESTABLISHED;
3019         queue_work(cm.wq, &work->work);
3020 out:
3021         return ret;
3022 }
3023 EXPORT_SYMBOL(ib_cm_establish);
3024
3025 static void cm_recv_handler(struct ib_mad_agent *mad_agent,
3026                             struct ib_mad_recv_wc *mad_recv_wc)
3027 {
3028         struct cm_work *work;
3029         enum ib_cm_event_type event;
3030         int paths = 0;
3031
3032         switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
3033         case CM_REQ_ATTR_ID:
3034                 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)->
3035                                                     alt_local_lid != 0);
3036                 event = IB_CM_REQ_RECEIVED;
3037                 break;
3038         case CM_MRA_ATTR_ID:
3039                 event = IB_CM_MRA_RECEIVED;
3040                 break;
3041         case CM_REJ_ATTR_ID:
3042                 event = IB_CM_REJ_RECEIVED;
3043                 break;
3044         case CM_REP_ATTR_ID:
3045                 event = IB_CM_REP_RECEIVED;
3046                 break;
3047         case CM_RTU_ATTR_ID:
3048                 event = IB_CM_RTU_RECEIVED;
3049                 break;
3050         case CM_DREQ_ATTR_ID:
3051                 event = IB_CM_DREQ_RECEIVED;
3052                 break;
3053         case CM_DREP_ATTR_ID:
3054                 event = IB_CM_DREP_RECEIVED;
3055                 break;
3056         case CM_SIDR_REQ_ATTR_ID:
3057                 event = IB_CM_SIDR_REQ_RECEIVED;
3058                 break;
3059         case CM_SIDR_REP_ATTR_ID:
3060                 event = IB_CM_SIDR_REP_RECEIVED;
3061                 break;
3062         case CM_LAP_ATTR_ID:
3063                 paths = 1;
3064                 event = IB_CM_LAP_RECEIVED;
3065                 break;
3066         case CM_APR_ATTR_ID:
3067                 event = IB_CM_APR_RECEIVED;
3068                 break;
3069         default:
3070                 ib_free_recv_mad(mad_recv_wc);
3071                 return;
3072         }
3073
3074         work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths,
3075                        GFP_KERNEL);
3076         if (!work) {
3077                 ib_free_recv_mad(mad_recv_wc);
3078                 return;
3079         }
3080
3081         INIT_WORK(&work->work, cm_work_handler, work);
3082         work->cm_event.event = event;
3083         work->mad_recv_wc = mad_recv_wc;
3084         work->port = (struct cm_port *)mad_agent->context;
3085         queue_work(cm.wq, &work->work);
3086 }
3087
3088 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
3089                                 struct ib_qp_attr *qp_attr,
3090                                 int *qp_attr_mask)
3091 {
3092         unsigned long flags;
3093         int ret;
3094
3095         spin_lock_irqsave(&cm_id_priv->lock, flags);
3096         switch (cm_id_priv->id.state) {
3097         case IB_CM_REQ_SENT:
3098         case IB_CM_MRA_REQ_RCVD:
3099         case IB_CM_REQ_RCVD:
3100         case IB_CM_MRA_REQ_SENT:
3101         case IB_CM_REP_RCVD:
3102         case IB_CM_MRA_REP_SENT:
3103         case IB_CM_REP_SENT:
3104         case IB_CM_MRA_REP_RCVD:
3105         case IB_CM_ESTABLISHED:
3106                 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
3107                                 IB_QP_PKEY_INDEX | IB_QP_PORT;
3108                 qp_attr->qp_access_flags = IB_ACCESS_LOCAL_WRITE |
3109                                            IB_ACCESS_REMOTE_WRITE;
3110                 if (cm_id_priv->responder_resources)
3111                         qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ;
3112                 qp_attr->pkey_index = cm_id_priv->av.pkey_index;
3113                 qp_attr->port_num = cm_id_priv->av.port->port_num;
3114                 ret = 0;
3115                 break;
3116         default:
3117                 ret = -EINVAL;
3118                 break;
3119         }
3120         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3121         return ret;
3122 }
3123
3124 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
3125                                struct ib_qp_attr *qp_attr,
3126                                int *qp_attr_mask)
3127 {
3128         unsigned long flags;
3129         int ret;
3130
3131         spin_lock_irqsave(&cm_id_priv->lock, flags);
3132         switch (cm_id_priv->id.state) {
3133         case IB_CM_REQ_RCVD:
3134         case IB_CM_MRA_REQ_SENT:
3135         case IB_CM_REP_RCVD:
3136         case IB_CM_MRA_REP_SENT:
3137         case IB_CM_REP_SENT:
3138         case IB_CM_MRA_REP_RCVD:
3139         case IB_CM_ESTABLISHED:
3140                 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
3141                                 IB_QP_DEST_QPN | IB_QP_RQ_PSN;
3142                 qp_attr->ah_attr = cm_id_priv->av.ah_attr;
3143                 qp_attr->path_mtu = cm_id_priv->path_mtu;
3144                 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
3145                 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
3146                 if (cm_id_priv->qp_type == IB_QPT_RC) {
3147                         *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC |
3148                                          IB_QP_MIN_RNR_TIMER;
3149                         qp_attr->max_dest_rd_atomic =
3150                                         cm_id_priv->responder_resources;
3151                         qp_attr->min_rnr_timer = 0;
3152                 }
3153                 if (cm_id_priv->alt_av.ah_attr.dlid) {
3154                         *qp_attr_mask |= IB_QP_ALT_PATH;
3155                         qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
3156                         qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3157                 }
3158                 ret = 0;
3159                 break;
3160         default:
3161                 ret = -EINVAL;
3162                 break;
3163         }
3164         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3165         return ret;
3166 }
3167
3168 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv,
3169                                struct ib_qp_attr *qp_attr,
3170                                int *qp_attr_mask)
3171 {
3172         unsigned long flags;
3173         int ret;
3174
3175         spin_lock_irqsave(&cm_id_priv->lock, flags);
3176         switch (cm_id_priv->id.state) {
3177         case IB_CM_REP_RCVD:
3178         case IB_CM_MRA_REP_SENT:
3179         case IB_CM_REP_SENT:
3180         case IB_CM_MRA_REP_RCVD:
3181         case IB_CM_ESTABLISHED:
3182                 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN;
3183                 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn);
3184                 if (cm_id_priv->qp_type == IB_QPT_RC) {
3185                         *qp_attr_mask |= IB_QP_TIMEOUT | IB_QP_RETRY_CNT |
3186                                          IB_QP_RNR_RETRY |
3187                                          IB_QP_MAX_QP_RD_ATOMIC;
3188                         qp_attr->timeout = cm_id_priv->local_ack_timeout;
3189                         qp_attr->retry_cnt = cm_id_priv->retry_count;
3190                         qp_attr->rnr_retry = cm_id_priv->rnr_retry_count;
3191                         qp_attr->max_rd_atomic = cm_id_priv->initiator_depth;
3192                 }
3193                 if (cm_id_priv->alt_av.ah_attr.dlid) {
3194                         *qp_attr_mask |= IB_QP_PATH_MIG_STATE;
3195                         qp_attr->path_mig_state = IB_MIG_REARM;
3196                 }
3197                 ret = 0;
3198                 break;
3199         default:
3200                 ret = -EINVAL;
3201                 break;
3202         }
3203         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3204         return ret;
3205 }
3206
3207 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
3208                        struct ib_qp_attr *qp_attr,
3209                        int *qp_attr_mask)
3210 {
3211         struct cm_id_private *cm_id_priv;
3212         int ret;
3213
3214         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3215         switch (qp_attr->qp_state) {
3216         case IB_QPS_INIT:
3217                 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask);
3218                 break;
3219         case IB_QPS_RTR:
3220                 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask);
3221                 break;
3222         case IB_QPS_RTS:
3223                 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask);
3224                 break;
3225         default:
3226                 ret = -EINVAL;
3227                 break;
3228         }
3229         return ret;
3230 }
3231 EXPORT_SYMBOL(ib_cm_init_qp_attr);
3232
3233 static void cm_add_one(struct ib_device *device)
3234 {
3235         struct cm_device *cm_dev;
3236         struct cm_port *port;
3237         struct ib_mad_reg_req reg_req = {
3238                 .mgmt_class = IB_MGMT_CLASS_CM,
3239                 .mgmt_class_version = IB_CM_CLASS_VERSION
3240         };
3241         struct ib_port_modify port_modify = {
3242                 .set_port_cap_mask = IB_PORT_CM_SUP
3243         };
3244         unsigned long flags;
3245         int ret;
3246         u8 i;
3247
3248         cm_dev = kmalloc(sizeof(*cm_dev) + sizeof(*port) *
3249                          device->phys_port_cnt, GFP_KERNEL);
3250         if (!cm_dev)
3251                 return;
3252
3253         cm_dev->device = device;
3254         cm_dev->ca_guid = device->node_guid;
3255
3256         set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
3257         for (i = 1; i <= device->phys_port_cnt; i++) {
3258                 port = &cm_dev->port[i-1];
3259                 port->cm_dev = cm_dev;
3260                 port->port_num = i;
3261                 port->mad_agent = ib_register_mad_agent(device, i,
3262                                                         IB_QPT_GSI,
3263                                                         &reg_req,
3264                                                         0,
3265                                                         cm_send_handler,
3266                                                         cm_recv_handler,
3267                                                         port);
3268                 if (IS_ERR(port->mad_agent))
3269                         goto error1;
3270
3271                 ret = ib_modify_port(device, i, 0, &port_modify);
3272                 if (ret)
3273                         goto error2;
3274         }
3275         ib_set_client_data(device, &cm_client, cm_dev);
3276
3277         write_lock_irqsave(&cm.device_lock, flags);
3278         list_add_tail(&cm_dev->list, &cm.device_list);
3279         write_unlock_irqrestore(&cm.device_lock, flags);
3280         return;
3281
3282 error2:
3283         ib_unregister_mad_agent(port->mad_agent);
3284 error1:
3285         port_modify.set_port_cap_mask = 0;
3286         port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
3287         while (--i) {
3288                 port = &cm_dev->port[i-1];
3289                 ib_modify_port(device, port->port_num, 0, &port_modify);
3290                 ib_unregister_mad_agent(port->mad_agent);
3291         }
3292         kfree(cm_dev);
3293 }
3294
3295 static void cm_remove_one(struct ib_device *device)
3296 {
3297         struct cm_device *cm_dev;
3298         struct cm_port *port;
3299         struct ib_port_modify port_modify = {
3300                 .clr_port_cap_mask = IB_PORT_CM_SUP
3301         };
3302         unsigned long flags;
3303         int i;
3304
3305         cm_dev = ib_get_client_data(device, &cm_client);
3306         if (!cm_dev)
3307                 return;
3308
3309         write_lock_irqsave(&cm.device_lock, flags);
3310         list_del(&cm_dev->list);
3311         write_unlock_irqrestore(&cm.device_lock, flags);
3312
3313         for (i = 1; i <= device->phys_port_cnt; i++) {
3314                 port = &cm_dev->port[i-1];
3315                 ib_modify_port(device, port->port_num, 0, &port_modify);
3316                 ib_unregister_mad_agent(port->mad_agent);
3317         }
3318         kfree(cm_dev);
3319 }
3320
3321 static int __init ib_cm_init(void)
3322 {
3323         int ret;
3324
3325         memset(&cm, 0, sizeof cm);
3326         INIT_LIST_HEAD(&cm.device_list);
3327         rwlock_init(&cm.device_lock);
3328         spin_lock_init(&cm.lock);
3329         cm.listen_service_table = RB_ROOT;
3330         cm.listen_service_id = __constant_be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID);
3331         cm.remote_id_table = RB_ROOT;
3332         cm.remote_qp_table = RB_ROOT;
3333         cm.remote_sidr_table = RB_ROOT;
3334         idr_init(&cm.local_id_table);
3335         idr_pre_get(&cm.local_id_table, GFP_KERNEL);
3336
3337         cm.wq = create_workqueue("ib_cm");
3338         if (!cm.wq)
3339                 return -ENOMEM;
3340
3341         ret = ib_register_client(&cm_client);
3342         if (ret)
3343                 goto error;
3344
3345         return 0;
3346 error:
3347         destroy_workqueue(cm.wq);
3348         return ret;
3349 }
3350
3351 static void __exit ib_cm_cleanup(void)
3352 {
3353         destroy_workqueue(cm.wq);
3354         ib_unregister_client(&cm_client);
3355         idr_destroy(&cm.local_id_table);
3356 }
3357
3358 module_init(ib_cm_init);
3359 module_exit(ib_cm_cleanup);
3360