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 static void cm_destroy_id(struct ib_cm_id *cm_id, int err)
 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_REQ_RCVD:
 739                 if (err == -ENOMEM) {
 740                         /* Do not reject to allow future retries. */
 741                         cm_reset_to_idle(cm_id_priv);
 742                         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 743                 } else {
 744                         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 745                         ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
 746                                        NULL, 0, NULL, 0);
 747                 }
 748                 break;
 749         case IB_CM_MRA_REQ_RCVD:
 750         case IB_CM_REP_SENT:
 751         case IB_CM_MRA_REP_RCVD:
 752                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
 753                 /* Fall through */
 754         case IB_CM_MRA_REQ_SENT:
 755         case IB_CM_REP_RCVD:
 756         case IB_CM_MRA_REP_SENT:
 757                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 758                 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
 759                                NULL, 0, NULL, 0);
 760                 break;
 761         case IB_CM_ESTABLISHED:
 762                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 763                 ib_send_cm_dreq(cm_id, NULL, 0);
 764                 goto retest;
 765         case IB_CM_DREQ_SENT:
 766                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
 767                 cm_enter_timewait(cm_id_priv);
 768                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 769                 break;
 770         case IB_CM_DREQ_RCVD:
 771                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 772                 ib_send_cm_drep(cm_id, NULL, 0);
 773                 break;
 774         default:
 775                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 776                 break;
 777         }
 778
 779         cm_free_id(cm_id->local_id);
 780         cm_deref_id(cm_id_priv);
 781         wait_for_completion(&cm_id_priv->comp);
 782         while ((work = cm_dequeue_work(cm_id_priv)) != NULL)
 783                 cm_free_work(work);
 784         kfree(cm_id_priv->compare_data);
 785         kfree(cm_id_priv->private_data);
 786         kfree(cm_id_priv);
 787 }
 788
 789 void ib_destroy_cm_id(struct ib_cm_id *cm_id)
 790 {
 791         cm_destroy_id(cm_id, 0);
 792 }
 793 EXPORT_SYMBOL(ib_destroy_cm_id);
 794
 795 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask,
 796                  struct ib_cm_compare_data *compare_data)
 797 {
 798         struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
 799         unsigned long flags;
 800         int ret = 0;
 801
 802         service_mask = service_mask ? service_mask :
 803                        __constant_cpu_to_be64(~0ULL);
 804         service_id &= service_mask;
 805         if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID &&
 806             (service_id != IB_CM_ASSIGN_SERVICE_ID))
 807                 return -EINVAL;
 808
 809         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
 810         if (cm_id->state != IB_CM_IDLE)
 811                 return -EINVAL;
 812
 813         if (compare_data) {
 814                 cm_id_priv->compare_data = kzalloc(sizeof *compare_data,
 815                                                    GFP_KERNEL);
 816                 if (!cm_id_priv->compare_data)
 817                         return -ENOMEM;
 818                 cm_mask_copy(cm_id_priv->compare_data->data,
 819                              compare_data->data, compare_data->mask);
 820                 memcpy(cm_id_priv->compare_data->mask, compare_data->mask,
 821                        IB_CM_COMPARE_SIZE);
 822         }
 823
 824         cm_id->state = IB_CM_LISTEN;
 825
 826         spin_lock_irqsave(&cm.lock, flags);
 827         if (service_id == IB_CM_ASSIGN_SERVICE_ID) {
 828                 cm_id->service_id = cpu_to_be64(cm.listen_service_id++);
 829                 cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
 830         } else {
 831                 cm_id->service_id = service_id;
 832                 cm_id->service_mask = service_mask;
 833         }
 834         cur_cm_id_priv = cm_insert_listen(cm_id_priv);
 835         spin_unlock_irqrestore(&cm.lock, flags);
 836
 837         if (cur_cm_id_priv) {
 838                 cm_id->state = IB_CM_IDLE;
 839                 kfree(cm_id_priv->compare_data);
 840                 cm_id_priv->compare_data = NULL;
 841                 ret = -EBUSY;
 842         }
 843         return ret;
 844 }
 845 EXPORT_SYMBOL(ib_cm_listen);
 846
 847 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv,
 848                           enum cm_msg_sequence msg_seq)
 849 {
 850         u64 hi_tid, low_tid;
 851
 852         hi_tid   = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32;
 853         low_tid  = (u64) ((__force u32)cm_id_priv->id.local_id |
 854                           (msg_seq << 30));
 855         return cpu_to_be64(hi_tid | low_tid);
 856 }
 857
 858 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr,
 859                               __be16 attr_id, __be64 tid)
 860 {
 861         hdr->base_version  = IB_MGMT_BASE_VERSION;
 862         hdr->mgmt_class    = IB_MGMT_CLASS_CM;
 863         hdr->class_version = IB_CM_CLASS_VERSION;
 864         hdr->method        = IB_MGMT_METHOD_SEND;
 865         hdr->attr_id       = attr_id;
 866         hdr->tid           = tid;
 867 }
 868
 869 static void cm_format_req(struct cm_req_msg *req_msg,
 870                           struct cm_id_private *cm_id_priv,
 871                           struct ib_cm_req_param *param)
 872 {
 873         cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID,
 874                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ));
 875
 876         req_msg->local_comm_id = cm_id_priv->id.local_id;
 877         req_msg->service_id = param->service_id;
 878         req_msg->local_ca_guid = cm_id_priv->av.port->cm_dev->ca_guid;
 879         cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num));
 880         cm_req_set_resp_res(req_msg, param->responder_resources);
 881         cm_req_set_init_depth(req_msg, param->initiator_depth);
 882         cm_req_set_remote_resp_timeout(req_msg,
 883                                        param->remote_cm_response_timeout);
 884         cm_req_set_qp_type(req_msg, param->qp_type);
 885         cm_req_set_flow_ctrl(req_msg, param->flow_control);
 886         cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn));
 887         cm_req_set_local_resp_timeout(req_msg,
 888                                       param->local_cm_response_timeout);
 889         cm_req_set_retry_count(req_msg, param->retry_count);
 890         req_msg->pkey = param->primary_path->pkey;
 891         cm_req_set_path_mtu(req_msg, param->primary_path->mtu);
 892         cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count);
 893         cm_req_set_max_cm_retries(req_msg, param->max_cm_retries);
 894         cm_req_set_srq(req_msg, param->srq);
 895
 896         req_msg->primary_local_lid = param->primary_path->slid;
 897         req_msg->primary_remote_lid = param->primary_path->dlid;
 898         req_msg->primary_local_gid = param->primary_path->sgid;
 899         req_msg->primary_remote_gid = param->primary_path->dgid;
 900         cm_req_set_primary_flow_label(req_msg, param->primary_path->flow_label);
 901         cm_req_set_primary_packet_rate(req_msg, param->primary_path->rate);
 902         req_msg->primary_traffic_class = param->primary_path->traffic_class;
 903         req_msg->primary_hop_limit = param->primary_path->hop_limit;
 904         cm_req_set_primary_sl(req_msg, param->primary_path->sl);
 905         cm_req_set_primary_subnet_local(req_msg, 1); /* local only... */
 906         cm_req_set_primary_local_ack_timeout(req_msg,
 907                 min(31, param->primary_path->packet_life_time + 1));
 908
 909         if (param->alternate_path) {
 910                 req_msg->alt_local_lid = param->alternate_path->slid;
 911                 req_msg->alt_remote_lid = param->alternate_path->dlid;
 912                 req_msg->alt_local_gid = param->alternate_path->sgid;
 913                 req_msg->alt_remote_gid = param->alternate_path->dgid;
 914                 cm_req_set_alt_flow_label(req_msg,
 915                                           param->alternate_path->flow_label);
 916                 cm_req_set_alt_packet_rate(req_msg, param->alternate_path->rate);
 917                 req_msg->alt_traffic_class = param->alternate_path->traffic_class;
 918                 req_msg->alt_hop_limit = param->alternate_path->hop_limit;
 919                 cm_req_set_alt_sl(req_msg, param->alternate_path->sl);
 920                 cm_req_set_alt_subnet_local(req_msg, 1); /* local only... */
 921                 cm_req_set_alt_local_ack_timeout(req_msg,
 922                         min(31, param->alternate_path->packet_life_time + 1));
 923         }
 924
 925         if (param->private_data && param->private_data_len)
 926                 memcpy(req_msg->private_data, param->private_data,
 927                        param->private_data_len);
 928 }
 929
 930 static int cm_validate_req_param(struct ib_cm_req_param *param)
 931 {
 932         /* peer-to-peer not supported */
 933         if (param->peer_to_peer)
 934                 return -EINVAL;
 935
 936         if (!param->primary_path)
 937                 return -EINVAL;
 938
 939         if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC)
 940                 return -EINVAL;
 941
 942         if (param->private_data &&
 943             param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE)
 944                 return -EINVAL;
 945
 946         if (param->alternate_path &&
 947             (param->alternate_path->pkey != param->primary_path->pkey ||
 948              param->alternate_path->mtu != param->primary_path->mtu))
 949                 return -EINVAL;
 950
 951         return 0;
 952 }
 953
 954 int ib_send_cm_req(struct ib_cm_id *cm_id,
 955                    struct ib_cm_req_param *param)
 956 {
 957         struct cm_id_private *cm_id_priv;
 958         struct cm_req_msg *req_msg;
 959         unsigned long flags;
 960         int ret;
 961
 962         ret = cm_validate_req_param(param);
 963         if (ret)
 964                 return ret;
 965
 966         /* Verify that we're not in timewait. */
 967         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
 968         spin_lock_irqsave(&cm_id_priv->lock, flags);
 969         if (cm_id->state != IB_CM_IDLE) {
 970                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 971                 ret = -EINVAL;
 972                 goto out;
 973         }
 974         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 975
 976         cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
 977                                                             id.local_id);
 978         if (IS_ERR(cm_id_priv->timewait_info)) {
 979                 ret = PTR_ERR(cm_id_priv->timewait_info);
 980                 goto out;
 981         }
 982
 983         ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av);
 984         if (ret)
 985                 goto error1;
 986         if (param->alternate_path) {
 987                 ret = cm_init_av_by_path(param->alternate_path,
 988                                          &cm_id_priv->alt_av);
 989                 if (ret)
 990                         goto error1;
 991         }
 992         cm_id->service_id = param->service_id;
 993         cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
 994         cm_id_priv->timeout_ms = cm_convert_to_ms(
 995                                     param->primary_path->packet_life_time) * 2 +
 996                                  cm_convert_to_ms(
 997                                     param->remote_cm_response_timeout);
 998         cm_id_priv->max_cm_retries = param->max_cm_retries;
 999         cm_id_priv->initiator_depth = param->initiator_depth;
1000         cm_id_priv->responder_resources = param->responder_resources;
1001         cm_id_priv->retry_count = param->retry_count;
1002         cm_id_priv->path_mtu = param->primary_path->mtu;
1003         cm_id_priv->qp_type = param->qp_type;
1004
1005         ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg);
1006         if (ret)
1007                 goto error1;
1008
1009         req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad;
1010         cm_format_req(req_msg, cm_id_priv, param);
1011         cm_id_priv->tid = req_msg->hdr.tid;
1012         cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms;
1013         cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT;
1014
1015         cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg);
1016         cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg);
1017         cm_id_priv->local_ack_timeout =
1018                                 cm_req_get_primary_local_ack_timeout(req_msg);
1019
1020         spin_lock_irqsave(&cm_id_priv->lock, flags);
1021         ret = ib_post_send_mad(cm_id_priv->msg, NULL);
1022         if (ret) {
1023                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1024                 goto error2;
1025         }
1026         BUG_ON(cm_id->state != IB_CM_IDLE);
1027         cm_id->state = IB_CM_REQ_SENT;
1028         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1029         return 0;
1030
1031 error2: cm_free_msg(cm_id_priv->msg);
1032 error1: kfree(cm_id_priv->timewait_info);
1033 out:    return ret;
1034 }
1035 EXPORT_SYMBOL(ib_send_cm_req);
1036
1037 static int cm_issue_rej(struct cm_port *port,
1038                         struct ib_mad_recv_wc *mad_recv_wc,
1039                         enum ib_cm_rej_reason reason,
1040                         enum cm_msg_response msg_rejected,
1041                         void *ari, u8 ari_length)
1042 {
1043         struct ib_mad_send_buf *msg = NULL;
1044         struct cm_rej_msg *rej_msg, *rcv_msg;
1045         int ret;
1046
1047         ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
1048         if (ret)
1049                 return ret;
1050
1051         /* We just need common CM header information.  Cast to any message. */
1052         rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad;
1053         rej_msg = (struct cm_rej_msg *) msg->mad;
1054
1055         cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid);
1056         rej_msg->remote_comm_id = rcv_msg->local_comm_id;
1057         rej_msg->local_comm_id = rcv_msg->remote_comm_id;
1058         cm_rej_set_msg_rejected(rej_msg, msg_rejected);
1059         rej_msg->reason = cpu_to_be16(reason);
1060
1061         if (ari && ari_length) {
1062                 cm_rej_set_reject_info_len(rej_msg, ari_length);
1063                 memcpy(rej_msg->ari, ari, ari_length);
1064         }
1065
1066         ret = ib_post_send_mad(msg, NULL);
1067         if (ret)
1068                 cm_free_msg(msg);
1069
1070         return ret;
1071 }
1072
1073 static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid,
1074                                     __be32 local_qpn, __be32 remote_qpn)
1075 {
1076         return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) ||
1077                 ((local_ca_guid == remote_ca_guid) &&
1078                  (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn))));
1079 }
1080
1081 static void cm_format_paths_from_req(struct cm_req_msg *req_msg,
1082                                             struct ib_sa_path_rec *primary_path,
1083                                             struct ib_sa_path_rec *alt_path)
1084 {
1085         memset(primary_path, 0, sizeof *primary_path);
1086         primary_path->dgid = req_msg->primary_local_gid;
1087         primary_path->sgid = req_msg->primary_remote_gid;
1088         primary_path->dlid = req_msg->primary_local_lid;
1089         primary_path->slid = req_msg->primary_remote_lid;
1090         primary_path->flow_label = cm_req_get_primary_flow_label(req_msg);
1091         primary_path->hop_limit = req_msg->primary_hop_limit;
1092         primary_path->traffic_class = req_msg->primary_traffic_class;
1093         primary_path->reversible = 1;
1094         primary_path->pkey = req_msg->pkey;
1095         primary_path->sl = cm_req_get_primary_sl(req_msg);
1096         primary_path->mtu_selector = IB_SA_EQ;
1097         primary_path->mtu = cm_req_get_path_mtu(req_msg);
1098         primary_path->rate_selector = IB_SA_EQ;
1099         primary_path->rate = cm_req_get_primary_packet_rate(req_msg);
1100         primary_path->packet_life_time_selector = IB_SA_EQ;
1101         primary_path->packet_life_time =
1102                 cm_req_get_primary_local_ack_timeout(req_msg);
1103         primary_path->packet_life_time -= (primary_path->packet_life_time > 0);
1104
1105         if (req_msg->alt_local_lid) {
1106                 memset(alt_path, 0, sizeof *alt_path);
1107                 alt_path->dgid = req_msg->alt_local_gid;
1108                 alt_path->sgid = req_msg->alt_remote_gid;
1109                 alt_path->dlid = req_msg->alt_local_lid;
1110                 alt_path->slid = req_msg->alt_remote_lid;
1111                 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg);
1112                 alt_path->hop_limit = req_msg->alt_hop_limit;
1113                 alt_path->traffic_class = req_msg->alt_traffic_class;
1114                 alt_path->reversible = 1;
1115                 alt_path->pkey = req_msg->pkey;
1116                 alt_path->sl = cm_req_get_alt_sl(req_msg);
1117                 alt_path->mtu_selector = IB_SA_EQ;
1118                 alt_path->mtu = cm_req_get_path_mtu(req_msg);
1119                 alt_path->rate_selector = IB_SA_EQ;
1120                 alt_path->rate = cm_req_get_alt_packet_rate(req_msg);
1121                 alt_path->packet_life_time_selector = IB_SA_EQ;
1122                 alt_path->packet_life_time =
1123                         cm_req_get_alt_local_ack_timeout(req_msg);
1124                 alt_path->packet_life_time -= (alt_path->packet_life_time > 0);
1125         }
1126 }
1127
1128 static void cm_format_req_event(struct cm_work *work,
1129                                 struct cm_id_private *cm_id_priv,
1130                                 struct ib_cm_id *listen_id)
1131 {
1132         struct cm_req_msg *req_msg;
1133         struct ib_cm_req_event_param *param;
1134
1135         req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1136         param = &work->cm_event.param.req_rcvd;
1137         param->listen_id = listen_id;
1138         param->port = cm_id_priv->av.port->port_num;
1139         param->primary_path = &work->path[0];
1140         if (req_msg->alt_local_lid)
1141                 param->alternate_path = &work->path[1];
1142         else
1143                 param->alternate_path = NULL;
1144         param->remote_ca_guid = req_msg->local_ca_guid;
1145         param->remote_qkey = be32_to_cpu(req_msg->local_qkey);
1146         param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg));
1147         param->qp_type = cm_req_get_qp_type(req_msg);
1148         param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg));
1149         param->responder_resources = cm_req_get_init_depth(req_msg);
1150         param->initiator_depth = cm_req_get_resp_res(req_msg);
1151         param->local_cm_response_timeout =
1152                                         cm_req_get_remote_resp_timeout(req_msg);
1153         param->flow_control = cm_req_get_flow_ctrl(req_msg);
1154         param->remote_cm_response_timeout =
1155                                         cm_req_get_local_resp_timeout(req_msg);
1156         param->retry_count = cm_req_get_retry_count(req_msg);
1157         param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1158         param->srq = cm_req_get_srq(req_msg);
1159         work->cm_event.private_data = &req_msg->private_data;
1160 }
1161
1162 static void cm_process_work(struct cm_id_private *cm_id_priv,
1163                             struct cm_work *work)
1164 {
1165         unsigned long flags;
1166         int ret;
1167
1168         /* We will typically only have the current event to report. */
1169         ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
1170         cm_free_work(work);
1171
1172         while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) {
1173                 spin_lock_irqsave(&cm_id_priv->lock, flags);
1174                 work = cm_dequeue_work(cm_id_priv);
1175                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1176                 BUG_ON(!work);
1177                 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id,
1178                                                 &work->cm_event);
1179                 cm_free_work(work);
1180         }
1181         cm_deref_id(cm_id_priv);
1182         if (ret)
1183                 cm_destroy_id(&cm_id_priv->id, ret);
1184 }
1185
1186 static void cm_format_mra(struct cm_mra_msg *mra_msg,
1187                           struct cm_id_private *cm_id_priv,
1188                           enum cm_msg_response msg_mraed, u8 service_timeout,
1189                           const void *private_data, u8 private_data_len)
1190 {
1191         cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid);
1192         cm_mra_set_msg_mraed(mra_msg, msg_mraed);
1193         mra_msg->local_comm_id = cm_id_priv->id.local_id;
1194         mra_msg->remote_comm_id = cm_id_priv->id.remote_id;
1195         cm_mra_set_service_timeout(mra_msg, service_timeout);
1196
1197         if (private_data && private_data_len)
1198                 memcpy(mra_msg->private_data, private_data, private_data_len);
1199 }
1200
1201 static void cm_format_rej(struct cm_rej_msg *rej_msg,
1202                           struct cm_id_private *cm_id_priv,
1203                           enum ib_cm_rej_reason reason,
1204                           void *ari,
1205                           u8 ari_length,
1206                           const void *private_data,
1207                           u8 private_data_len)
1208 {
1209         cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid);
1210         rej_msg->remote_comm_id = cm_id_priv->id.remote_id;
1211
1212         switch(cm_id_priv->id.state) {
1213         case IB_CM_REQ_RCVD:
1214                 rej_msg->local_comm_id = 0;
1215                 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1216                 break;
1217         case IB_CM_MRA_REQ_SENT:
1218                 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1219                 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1220                 break;
1221         case IB_CM_REP_RCVD:
1222         case IB_CM_MRA_REP_SENT:
1223                 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1224                 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP);
1225                 break;
1226         default:
1227                 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1228                 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER);
1229                 break;
1230         }
1231
1232         rej_msg->reason = cpu_to_be16(reason);
1233         if (ari && ari_length) {
1234                 cm_rej_set_reject_info_len(rej_msg, ari_length);
1235                 memcpy(rej_msg->ari, ari, ari_length);
1236         }
1237
1238         if (private_data && private_data_len)
1239                 memcpy(rej_msg->private_data, private_data, private_data_len);
1240 }
1241
1242 static void cm_dup_req_handler(struct cm_work *work,
1243                                struct cm_id_private *cm_id_priv)
1244 {
1245         struct ib_mad_send_buf *msg = NULL;
1246         unsigned long flags;
1247         int ret;
1248
1249         /* Quick state check to discard duplicate REQs. */
1250         if (cm_id_priv->id.state == IB_CM_REQ_RCVD)
1251                 return;
1252
1253         ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1254         if (ret)
1255                 return;
1256
1257         spin_lock_irqsave(&cm_id_priv->lock, flags);
1258         switch (cm_id_priv->id.state) {
1259         case IB_CM_MRA_REQ_SENT:
1260                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1261                               CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout,
1262                               cm_id_priv->private_data,
1263                               cm_id_priv->private_data_len);
1264                 break;
1265         case IB_CM_TIMEWAIT:
1266                 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv,
1267                               IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0);
1268                 break;
1269         default:
1270                 goto unlock;
1271         }
1272         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1273
1274         ret = ib_post_send_mad(msg, NULL);
1275         if (ret)
1276                 goto free;
1277         return;
1278
1279 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1280 free:   cm_free_msg(msg);
1281 }
1282
1283 static struct cm_id_private * cm_match_req(struct cm_work *work,
1284                                            struct cm_id_private *cm_id_priv)
1285 {
1286         struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv;
1287         struct cm_timewait_info *timewait_info;
1288         struct cm_req_msg *req_msg;
1289         unsigned long flags;
1290
1291         req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1292
1293         /* Check for duplicate REQ and stale connections. */
1294         spin_lock_irqsave(&cm.lock, flags);
1295         timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info);
1296         if (!timewait_info)
1297                 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
1298
1299         if (timewait_info) {
1300                 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
1301                                            timewait_info->work.remote_id);
1302                 spin_unlock_irqrestore(&cm.lock, flags);
1303                 if (cur_cm_id_priv) {
1304                         cm_dup_req_handler(work, cur_cm_id_priv);
1305                         cm_deref_id(cur_cm_id_priv);
1306                 } else
1307                         cm_issue_rej(work->port, work->mad_recv_wc,
1308                                      IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
1309                                      NULL, 0);
1310                 goto error;
1311         }
1312
1313         /* Find matching listen request. */
1314         listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device,
1315                                            req_msg->service_id,
1316                                            req_msg->private_data);
1317         if (!listen_cm_id_priv) {
1318                 spin_unlock_irqrestore(&cm.lock, flags);
1319                 cm_issue_rej(work->port, work->mad_recv_wc,
1320                              IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ,
1321                              NULL, 0);
1322                 goto error;
1323         }
1324         atomic_inc(&listen_cm_id_priv->refcount);
1325         atomic_inc(&cm_id_priv->refcount);
1326         cm_id_priv->id.state = IB_CM_REQ_RCVD;
1327         atomic_inc(&cm_id_priv->work_count);
1328         spin_unlock_irqrestore(&cm.lock, flags);
1329         return listen_cm_id_priv;
1330
1331 error:  cm_cleanup_timewait(cm_id_priv->timewait_info);
1332         return NULL;
1333 }
1334
1335 static int cm_req_handler(struct cm_work *work)
1336 {
1337         struct ib_cm_id *cm_id;
1338         struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
1339         struct cm_req_msg *req_msg;
1340         int ret;
1341
1342         req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1343
1344         cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL);
1345         if (IS_ERR(cm_id))
1346                 return PTR_ERR(cm_id);
1347
1348         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1349         cm_id_priv->id.remote_id = req_msg->local_comm_id;
1350         cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
1351                                 work->mad_recv_wc->recv_buf.grh,
1352                                 &cm_id_priv->av);
1353         cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1354                                                             id.local_id);
1355         if (IS_ERR(cm_id_priv->timewait_info)) {
1356                 ret = PTR_ERR(cm_id_priv->timewait_info);
1357                 goto error1;
1358         }
1359         cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id;
1360         cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid;
1361         cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg);
1362
1363         listen_cm_id_priv = cm_match_req(work, cm_id_priv);
1364         if (!listen_cm_id_priv) {
1365                 ret = -EINVAL;
1366                 goto error2;
1367         }
1368
1369         cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
1370         cm_id_priv->id.context = listen_cm_id_priv->id.context;
1371         cm_id_priv->id.service_id = req_msg->service_id;
1372         cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL);
1373
1374         cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]);
1375         ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av);
1376         if (ret)
1377                 goto error3;
1378         if (req_msg->alt_local_lid) {
1379                 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av);
1380                 if (ret)
1381                         goto error3;
1382         }
1383         cm_id_priv->tid = req_msg->hdr.tid;
1384         cm_id_priv->timeout_ms = cm_convert_to_ms(
1385                                         cm_req_get_local_resp_timeout(req_msg));
1386         cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg);
1387         cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg);
1388         cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg);
1389         cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg);
1390         cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg);
1391         cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg);
1392         cm_id_priv->local_ack_timeout =
1393                                 cm_req_get_primary_local_ack_timeout(req_msg);
1394         cm_id_priv->retry_count = cm_req_get_retry_count(req_msg);
1395         cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1396         cm_id_priv->qp_type = cm_req_get_qp_type(req_msg);
1397
1398         cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
1399         cm_process_work(cm_id_priv, work);
1400         cm_deref_id(listen_cm_id_priv);
1401         return 0;
1402
1403 error3: atomic_dec(&cm_id_priv->refcount);
1404         cm_deref_id(listen_cm_id_priv);
1405         cm_cleanup_timewait(cm_id_priv->timewait_info);
1406 error2: kfree(cm_id_priv->timewait_info);
1407         cm_id_priv->timewait_info = NULL;
1408 error1: ib_destroy_cm_id(&cm_id_priv->id);
1409         return ret;
1410 }
1411
1412 static void cm_format_rep(struct cm_rep_msg *rep_msg,
1413                           struct cm_id_private *cm_id_priv,
1414                           struct ib_cm_rep_param *param)
1415 {
1416         cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid);
1417         rep_msg->local_comm_id = cm_id_priv->id.local_id;
1418         rep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1419         cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num));
1420         cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn));
1421         rep_msg->resp_resources = param->responder_resources;
1422         rep_msg->initiator_depth = param->initiator_depth;
1423         cm_rep_set_target_ack_delay(rep_msg, param->target_ack_delay);
1424         cm_rep_set_failover(rep_msg, param->failover_accepted);
1425         cm_rep_set_flow_ctrl(rep_msg, param->flow_control);
1426         cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count);
1427         cm_rep_set_srq(rep_msg, param->srq);
1428         rep_msg->local_ca_guid = cm_id_priv->av.port->cm_dev->ca_guid;
1429
1430         if (param->private_data && param->private_data_len)
1431                 memcpy(rep_msg->private_data, param->private_data,
1432                        param->private_data_len);
1433 }
1434
1435 int ib_send_cm_rep(struct ib_cm_id *cm_id,
1436                    struct ib_cm_rep_param *param)
1437 {
1438         struct cm_id_private *cm_id_priv;
1439         struct ib_mad_send_buf *msg;
1440         struct cm_rep_msg *rep_msg;
1441         unsigned long flags;
1442         int ret;
1443
1444         if (param->private_data &&
1445             param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE)
1446                 return -EINVAL;
1447
1448         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1449         spin_lock_irqsave(&cm_id_priv->lock, flags);
1450         if (cm_id->state != IB_CM_REQ_RCVD &&
1451             cm_id->state != IB_CM_MRA_REQ_SENT) {
1452                 ret = -EINVAL;
1453                 goto out;
1454         }
1455
1456         ret = cm_alloc_msg(cm_id_priv, &msg);
1457         if (ret)
1458                 goto out;
1459
1460         rep_msg = (struct cm_rep_msg *) msg->mad;
1461         cm_format_rep(rep_msg, cm_id_priv, param);
1462         msg->timeout_ms = cm_id_priv->timeout_ms;
1463         msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;
1464
1465         ret = ib_post_send_mad(msg, NULL);
1466         if (ret) {
1467                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1468                 cm_free_msg(msg);
1469                 return ret;
1470         }
1471
1472         cm_id->state = IB_CM_REP_SENT;
1473         cm_id_priv->msg = msg;
1474         cm_id_priv->initiator_depth = param->initiator_depth;
1475         cm_id_priv->responder_resources = param->responder_resources;
1476         cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg);
1477         cm_id_priv->local_qpn = cm_rep_get_local_qpn(rep_msg);
1478
1479 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1480         return ret;
1481 }
1482 EXPORT_SYMBOL(ib_send_cm_rep);
1483
1484 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg,
1485                           struct cm_id_private *cm_id_priv,
1486                           const void *private_data,
1487                           u8 private_data_len)
1488 {
1489         cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid);
1490         rtu_msg->local_comm_id = cm_id_priv->id.local_id;
1491         rtu_msg->remote_comm_id = cm_id_priv->id.remote_id;
1492
1493         if (private_data && private_data_len)
1494                 memcpy(rtu_msg->private_data, private_data, private_data_len);
1495 }
1496
1497 int ib_send_cm_rtu(struct ib_cm_id *cm_id,
1498                    const void *private_data,
1499                    u8 private_data_len)
1500 {
1501         struct cm_id_private *cm_id_priv;
1502         struct ib_mad_send_buf *msg;
1503         unsigned long flags;
1504         void *data;
1505         int ret;
1506
1507         if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE)
1508                 return -EINVAL;
1509
1510         data = cm_copy_private_data(private_data, private_data_len);
1511         if (IS_ERR(data))
1512                 return PTR_ERR(data);
1513
1514         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1515         spin_lock_irqsave(&cm_id_priv->lock, flags);
1516         if (cm_id->state != IB_CM_REP_RCVD &&
1517             cm_id->state != IB_CM_MRA_REP_SENT) {
1518                 ret = -EINVAL;
1519                 goto error;
1520         }
1521
1522         ret = cm_alloc_msg(cm_id_priv, &msg);
1523         if (ret)
1524                 goto error;
1525
1526         cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1527                       private_data, private_data_len);
1528
1529         ret = ib_post_send_mad(msg, NULL);
1530         if (ret) {
1531                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1532                 cm_free_msg(msg);
1533                 kfree(data);
1534                 return ret;
1535         }
1536
1537         cm_id->state = IB_CM_ESTABLISHED;
1538         cm_set_private_data(cm_id_priv, data, private_data_len);
1539         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1540         return 0;
1541
1542 error:  spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1543         kfree(data);
1544         return ret;
1545 }
1546 EXPORT_SYMBOL(ib_send_cm_rtu);
1547
1548 static void cm_format_rep_event(struct cm_work *work)
1549 {
1550         struct cm_rep_msg *rep_msg;
1551         struct ib_cm_rep_event_param *param;
1552
1553         rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1554         param = &work->cm_event.param.rep_rcvd;
1555         param->remote_ca_guid = rep_msg->local_ca_guid;
1556         param->remote_qkey = be32_to_cpu(rep_msg->local_qkey);
1557         param->remote_qpn = be32_to_cpu(cm_rep_get_local_qpn(rep_msg));
1558         param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg));
1559         param->responder_resources = rep_msg->initiator_depth;
1560         param->initiator_depth = rep_msg->resp_resources;
1561         param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
1562         param->failover_accepted = cm_rep_get_failover(rep_msg);
1563         param->flow_control = cm_rep_get_flow_ctrl(rep_msg);
1564         param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1565         param->srq = cm_rep_get_srq(rep_msg);
1566         work->cm_event.private_data = &rep_msg->private_data;
1567 }
1568
1569 static void cm_dup_rep_handler(struct cm_work *work)
1570 {
1571         struct cm_id_private *cm_id_priv;
1572         struct cm_rep_msg *rep_msg;
1573         struct ib_mad_send_buf *msg = NULL;
1574         unsigned long flags;
1575         int ret;
1576
1577         rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad;
1578         cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id,
1579                                    rep_msg->local_comm_id);
1580         if (!cm_id_priv)
1581                 return;
1582
1583         ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1584         if (ret)
1585                 goto deref;
1586
1587         spin_lock_irqsave(&cm_id_priv->lock, flags);
1588         if (cm_id_priv->id.state == IB_CM_ESTABLISHED)
1589                 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1590                               cm_id_priv->private_data,
1591                               cm_id_priv->private_data_len);
1592         else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT)
1593                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1594                               CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout,
1595                               cm_id_priv->private_data,
1596                               cm_id_priv->private_data_len);
1597         else
1598                 goto unlock;
1599         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1600
1601         ret = ib_post_send_mad(msg, NULL);
1602         if (ret)
1603                 goto free;
1604         goto deref;
1605
1606 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1607 free:   cm_free_msg(msg);
1608 deref:  cm_deref_id(cm_id_priv);
1609 }
1610
1611 static int cm_rep_handler(struct cm_work *work)
1612 {
1613         struct cm_id_private *cm_id_priv;
1614         struct cm_rep_msg *rep_msg;
1615         unsigned long flags;
1616         int ret;
1617
1618         rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1619         cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0);
1620         if (!cm_id_priv) {
1621                 cm_dup_rep_handler(work);
1622                 return -EINVAL;
1623         }
1624
1625         cm_format_rep_event(work);
1626
1627         spin_lock_irqsave(&cm_id_priv->lock, flags);
1628         switch (cm_id_priv->id.state) {
1629         case IB_CM_REQ_SENT:
1630         case IB_CM_MRA_REQ_RCVD:
1631                 break;
1632         default:
1633                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1634                 ret = -EINVAL;
1635                 goto error;
1636         }
1637
1638         cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id;
1639         cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid;
1640         cm_id_priv->timewait_info->remote_qpn = cm_rep_get_local_qpn(rep_msg);
1641
1642         spin_lock(&cm.lock);
1643         /* Check for duplicate REP. */
1644         if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
1645                 spin_unlock(&cm.lock);
1646                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1647                 ret = -EINVAL;
1648                 goto error;
1649         }
1650         /* Check for a stale connection. */
1651         if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) {
1652                 rb_erase(&cm_id_priv->timewait_info->remote_id_node,
1653                          &cm.remote_id_table);
1654                 cm_id_priv->timewait_info->inserted_remote_id = 0;
1655                 spin_unlock(&cm.lock);
1656                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1657                 cm_issue_rej(work->port, work->mad_recv_wc,
1658                              IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP,
1659                              NULL, 0);
1660                 ret = -EINVAL;
1661                 goto error;
1662         }
1663         spin_unlock(&cm.lock);
1664
1665         cm_id_priv->id.state = IB_CM_REP_RCVD;
1666         cm_id_priv->id.remote_id = rep_msg->local_comm_id;
1667         cm_id_priv->remote_qpn = cm_rep_get_local_qpn(rep_msg);
1668         cm_id_priv->initiator_depth = rep_msg->resp_resources;
1669         cm_id_priv->responder_resources = rep_msg->initiator_depth;
1670         cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg);
1671         cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1672
1673         /* todo: handle peer_to_peer */
1674
1675         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1676         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1677         if (!ret)
1678                 list_add_tail(&work->list, &cm_id_priv->work_list);
1679         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1680
1681         if (ret)
1682                 cm_process_work(cm_id_priv, work);
1683         else
1684                 cm_deref_id(cm_id_priv);
1685         return 0;
1686
1687 error:
1688         cm_deref_id(cm_id_priv);
1689         return ret;
1690 }
1691
1692 static int cm_establish_handler(struct cm_work *work)
1693 {
1694         struct cm_id_private *cm_id_priv;
1695         unsigned long flags;
1696         int ret;
1697
1698         /* See comment in ib_cm_establish about lookup. */
1699         cm_id_priv = cm_acquire_id(work->local_id, work->remote_id);
1700         if (!cm_id_priv)
1701                 return -EINVAL;
1702
1703         spin_lock_irqsave(&cm_id_priv->lock, flags);
1704         if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
1705                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1706                 goto out;
1707         }
1708
1709         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1710         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1711         if (!ret)
1712                 list_add_tail(&work->list, &cm_id_priv->work_list);
1713         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1714
1715         if (ret)
1716                 cm_process_work(cm_id_priv, work);
1717         else
1718                 cm_deref_id(cm_id_priv);
1719         return 0;
1720 out:
1721         cm_deref_id(cm_id_priv);
1722         return -EINVAL;
1723 }
1724
1725 static int cm_rtu_handler(struct cm_work *work)
1726 {
1727         struct cm_id_private *cm_id_priv;
1728         struct cm_rtu_msg *rtu_msg;
1729         unsigned long flags;
1730         int ret;
1731
1732         rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad;
1733         cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id,
1734                                    rtu_msg->local_comm_id);
1735         if (!cm_id_priv)
1736                 return -EINVAL;
1737
1738         work->cm_event.private_data = &rtu_msg->private_data;
1739
1740         spin_lock_irqsave(&cm_id_priv->lock, flags);
1741         if (cm_id_priv->id.state != IB_CM_REP_SENT &&
1742             cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
1743                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1744                 goto out;
1745         }
1746         cm_id_priv->id.state = IB_CM_ESTABLISHED;
1747
1748         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1749         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1750         if (!ret)
1751                 list_add_tail(&work->list, &cm_id_priv->work_list);
1752         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1753
1754         if (ret)
1755                 cm_process_work(cm_id_priv, work);
1756         else
1757                 cm_deref_id(cm_id_priv);
1758         return 0;
1759 out:
1760         cm_deref_id(cm_id_priv);
1761         return -EINVAL;
1762 }
1763
1764 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg,
1765                           struct cm_id_private *cm_id_priv,
1766                           const void *private_data,
1767                           u8 private_data_len)
1768 {
1769         cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID,
1770                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ));
1771         dreq_msg->local_comm_id = cm_id_priv->id.local_id;
1772         dreq_msg->remote_comm_id = cm_id_priv->id.remote_id;
1773         cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn);
1774
1775         if (private_data && private_data_len)
1776                 memcpy(dreq_msg->private_data, private_data, private_data_len);
1777 }
1778
1779 int ib_send_cm_dreq(struct ib_cm_id *cm_id,
1780                     const void *private_data,
1781                     u8 private_data_len)
1782 {
1783         struct cm_id_private *cm_id_priv;
1784         struct ib_mad_send_buf *msg;
1785         unsigned long flags;
1786         int ret;
1787
1788         if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE)
1789                 return -EINVAL;
1790
1791         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1792         spin_lock_irqsave(&cm_id_priv->lock, flags);
1793         if (cm_id->state != IB_CM_ESTABLISHED) {
1794                 ret = -EINVAL;
1795                 goto out;
1796         }
1797
1798         ret = cm_alloc_msg(cm_id_priv, &msg);
1799         if (ret) {
1800                 cm_enter_timewait(cm_id_priv);
1801                 goto out;
1802         }
1803
1804         cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv,
1805                        private_data, private_data_len);
1806         msg->timeout_ms = cm_id_priv->timeout_ms;
1807         msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
1808
1809         ret = ib_post_send_mad(msg, NULL);
1810         if (ret) {
1811                 cm_enter_timewait(cm_id_priv);
1812                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1813                 cm_free_msg(msg);
1814                 return ret;
1815         }
1816
1817         cm_id->state = IB_CM_DREQ_SENT;
1818         cm_id_priv->msg = msg;
1819 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1820         return ret;
1821 }
1822 EXPORT_SYMBOL(ib_send_cm_dreq);
1823
1824 static void cm_format_drep(struct cm_drep_msg *drep_msg,
1825                           struct cm_id_private *cm_id_priv,
1826                           const void *private_data,
1827                           u8 private_data_len)
1828 {
1829         cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid);
1830         drep_msg->local_comm_id = cm_id_priv->id.local_id;
1831         drep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1832
1833         if (private_data && private_data_len)
1834                 memcpy(drep_msg->private_data, private_data, private_data_len);
1835 }
1836
1837 int ib_send_cm_drep(struct ib_cm_id *cm_id,
1838                     const void *private_data,
1839                     u8 private_data_len)
1840 {
1841         struct cm_id_private *cm_id_priv;
1842         struct ib_mad_send_buf *msg;
1843         unsigned long flags;
1844         void *data;
1845         int ret;
1846
1847         if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
1848                 return -EINVAL;
1849
1850         data = cm_copy_private_data(private_data, private_data_len);
1851         if (IS_ERR(data))
1852                 return PTR_ERR(data);
1853
1854         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1855         spin_lock_irqsave(&cm_id_priv->lock, flags);
1856         if (cm_id->state != IB_CM_DREQ_RCVD) {
1857                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1858                 kfree(data);
1859                 return -EINVAL;
1860         }
1861
1862         cm_set_private_data(cm_id_priv, data, private_data_len);
1863         cm_enter_timewait(cm_id_priv);
1864
1865         ret = cm_alloc_msg(cm_id_priv, &msg);
1866         if (ret)
1867                 goto out;
1868
1869         cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
1870                        private_data, private_data_len);
1871
1872         ret = ib_post_send_mad(msg, NULL);
1873         if (ret) {
1874                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1875                 cm_free_msg(msg);
1876                 return ret;
1877         }
1878
1879 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1880         return ret;
1881 }
1882 EXPORT_SYMBOL(ib_send_cm_drep);
1883
1884 static int cm_dreq_handler(struct cm_work *work)
1885 {
1886         struct cm_id_private *cm_id_priv;
1887         struct cm_dreq_msg *dreq_msg;
1888         struct ib_mad_send_buf *msg = NULL;
1889         unsigned long flags;
1890         int ret;
1891
1892         dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
1893         cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id,
1894                                    dreq_msg->local_comm_id);
1895         if (!cm_id_priv)
1896                 return -EINVAL;
1897
1898         work->cm_event.private_data = &dreq_msg->private_data;
1899
1900         spin_lock_irqsave(&cm_id_priv->lock, flags);
1901         if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg))
1902                 goto unlock;
1903
1904         switch (cm_id_priv->id.state) {
1905         case IB_CM_REP_SENT:
1906         case IB_CM_DREQ_SENT:
1907                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1908                 break;
1909         case IB_CM_ESTABLISHED:
1910         case IB_CM_MRA_REP_RCVD:
1911                 break;
1912         case IB_CM_TIMEWAIT:
1913                 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
1914                         goto unlock;
1915
1916                 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
1917                                cm_id_priv->private_data,
1918                                cm_id_priv->private_data_len);
1919                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1920
1921                 if (ib_post_send_mad(msg, NULL))
1922                         cm_free_msg(msg);
1923                 goto deref;
1924         default:
1925                 goto unlock;
1926         }
1927         cm_id_priv->id.state = IB_CM_DREQ_RCVD;
1928         cm_id_priv->tid = dreq_msg->hdr.tid;
1929         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1930         if (!ret)
1931                 list_add_tail(&work->list, &cm_id_priv->work_list);
1932         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1933
1934         if (ret)
1935                 cm_process_work(cm_id_priv, work);
1936         else
1937                 cm_deref_id(cm_id_priv);
1938         return 0;
1939
1940 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1941 deref:  cm_deref_id(cm_id_priv);
1942         return -EINVAL;
1943 }
1944
1945 static int cm_drep_handler(struct cm_work *work)
1946 {
1947         struct cm_id_private *cm_id_priv;
1948         struct cm_drep_msg *drep_msg;
1949         unsigned long flags;
1950         int ret;
1951
1952         drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
1953         cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id,
1954                                    drep_msg->local_comm_id);
1955         if (!cm_id_priv)
1956                 return -EINVAL;
1957
1958         work->cm_event.private_data = &drep_msg->private_data;
1959
1960         spin_lock_irqsave(&cm_id_priv->lock, flags);
1961         if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
1962             cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
1963                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1964                 goto out;
1965         }
1966         cm_enter_timewait(cm_id_priv);
1967
1968         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1969         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1970         if (!ret)
1971                 list_add_tail(&work->list, &cm_id_priv->work_list);
1972         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1973
1974         if (ret)
1975                 cm_process_work(cm_id_priv, work);
1976         else
1977                 cm_deref_id(cm_id_priv);
1978         return 0;
1979 out:
1980         cm_deref_id(cm_id_priv);
1981         return -EINVAL;
1982 }
1983
1984 int ib_send_cm_rej(struct ib_cm_id *cm_id,
1985                    enum ib_cm_rej_reason reason,
1986                    void *ari,
1987                    u8 ari_length,
1988                    const void *private_data,
1989                    u8 private_data_len)
1990 {
1991         struct cm_id_private *cm_id_priv;
1992         struct ib_mad_send_buf *msg;
1993         unsigned long flags;
1994         int ret;
1995
1996         if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
1997             (ari && ari_length > IB_CM_REJ_ARI_LENGTH))
1998                 return -EINVAL;
1999
2000         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2001
2002         spin_lock_irqsave(&cm_id_priv->lock, flags);
2003         switch (cm_id->state) {
2004         case IB_CM_REQ_SENT:
2005         case IB_CM_MRA_REQ_RCVD:
2006         case IB_CM_REQ_RCVD:
2007         case IB_CM_MRA_REQ_SENT:
2008         case IB_CM_REP_RCVD:
2009         case IB_CM_MRA_REP_SENT:
2010                 ret = cm_alloc_msg(cm_id_priv, &msg);
2011                 if (!ret)
2012                         cm_format_rej((struct cm_rej_msg *) msg->mad,
2013                                       cm_id_priv, reason, ari, ari_length,
2014                                       private_data, private_data_len);
2015
2016                 cm_reset_to_idle(cm_id_priv);
2017                 break;
2018         case IB_CM_REP_SENT:
2019         case IB_CM_MRA_REP_RCVD:
2020                 ret = cm_alloc_msg(cm_id_priv, &msg);
2021                 if (!ret)
2022                         cm_format_rej((struct cm_rej_msg *) msg->mad,
2023                                       cm_id_priv, reason, ari, ari_length,
2024                                       private_data, private_data_len);
2025
2026                 cm_enter_timewait(cm_id_priv);
2027                 break;
2028         default:
2029                 ret = -EINVAL;
2030                 goto out;
2031         }
2032
2033         if (ret)
2034                 goto out;
2035
2036         ret = ib_post_send_mad(msg, NULL);
2037         if (ret)
2038                 cm_free_msg(msg);
2039
2040 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2041         return ret;
2042 }
2043 EXPORT_SYMBOL(ib_send_cm_rej);
2044
2045 static void cm_format_rej_event(struct cm_work *work)
2046 {
2047         struct cm_rej_msg *rej_msg;
2048         struct ib_cm_rej_event_param *param;
2049
2050         rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2051         param = &work->cm_event.param.rej_rcvd;
2052         param->ari = rej_msg->ari;
2053         param->ari_length = cm_rej_get_reject_info_len(rej_msg);
2054         param->reason = __be16_to_cpu(rej_msg->reason);
2055         work->cm_event.private_data = &rej_msg->private_data;
2056 }
2057
2058 static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
2059 {
2060         struct cm_timewait_info *timewait_info;
2061         struct cm_id_private *cm_id_priv;
2062         unsigned long flags;
2063         __be32 remote_id;
2064
2065         remote_id = rej_msg->local_comm_id;
2066
2067         if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) {
2068                 spin_lock_irqsave(&cm.lock, flags);
2069                 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari),
2070                                                   remote_id);
2071                 if (!timewait_info) {
2072                         spin_unlock_irqrestore(&cm.lock, flags);
2073                         return NULL;
2074                 }
2075                 cm_id_priv = idr_find(&cm.local_id_table,
2076                                       (__force int) timewait_info->work.local_id);
2077                 if (cm_id_priv) {
2078                         if (cm_id_priv->id.remote_id == remote_id)
2079                                 atomic_inc(&cm_id_priv->refcount);
2080                         else
2081                                 cm_id_priv = NULL;
2082                 }
2083                 spin_unlock_irqrestore(&cm.lock, flags);
2084         } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ)
2085                 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0);
2086         else
2087                 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id);
2088
2089         return cm_id_priv;
2090 }
2091
2092 static int cm_rej_handler(struct cm_work *work)
2093 {
2094         struct cm_id_private *cm_id_priv;
2095         struct cm_rej_msg *rej_msg;
2096         unsigned long flags;
2097         int ret;
2098
2099         rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2100         cm_id_priv = cm_acquire_rejected_id(rej_msg);
2101         if (!cm_id_priv)
2102                 return -EINVAL;
2103
2104         cm_format_rej_event(work);
2105
2106         spin_lock_irqsave(&cm_id_priv->lock, flags);
2107         switch (cm_id_priv->id.state) {
2108         case IB_CM_REQ_SENT:
2109         case IB_CM_MRA_REQ_RCVD:
2110         case IB_CM_REP_SENT:
2111         case IB_CM_MRA_REP_RCVD:
2112                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2113                 /* fall through */
2114         case IB_CM_REQ_RCVD:
2115         case IB_CM_MRA_REQ_SENT:
2116                 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN)
2117                         cm_enter_timewait(cm_id_priv);
2118                 else
2119                         cm_reset_to_idle(cm_id_priv);
2120                 break;
2121         case IB_CM_DREQ_SENT:
2122                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2123                 /* fall through */
2124         case IB_CM_REP_RCVD:
2125         case IB_CM_MRA_REP_SENT:
2126         case IB_CM_ESTABLISHED:
2127                 cm_enter_timewait(cm_id_priv);
2128                 break;
2129         default:
2130                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2131                 ret = -EINVAL;
2132                 goto out;
2133         }
2134
2135         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2136         if (!ret)
2137                 list_add_tail(&work->list, &cm_id_priv->work_list);
2138         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2139
2140         if (ret)
2141                 cm_process_work(cm_id_priv, work);
2142         else
2143                 cm_deref_id(cm_id_priv);
2144         return 0;
2145 out:
2146         cm_deref_id(cm_id_priv);
2147         return -EINVAL;
2148 }
2149
2150 int ib_send_cm_mra(struct ib_cm_id *cm_id,
2151                    u8 service_timeout,
2152                    const void *private_data,
2153                    u8 private_data_len)
2154 {
2155         struct cm_id_private *cm_id_priv;
2156         struct ib_mad_send_buf *msg;
2157         void *data;
2158         unsigned long flags;
2159         int ret;
2160
2161         if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE)
2162                 return -EINVAL;
2163
2164         data = cm_copy_private_data(private_data, private_data_len);
2165         if (IS_ERR(data))
2166                 return PTR_ERR(data);
2167
2168         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2169
2170         spin_lock_irqsave(&cm_id_priv->lock, flags);
2171         switch(cm_id_priv->id.state) {
2172         case IB_CM_REQ_RCVD:
2173                 ret = cm_alloc_msg(cm_id_priv, &msg);
2174                 if (ret)
2175                         goto error1;
2176
2177                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2178                               CM_MSG_RESPONSE_REQ, service_timeout,
2179                               private_data, private_data_len);
2180                 ret = ib_post_send_mad(msg, NULL);
2181                 if (ret)
2182                         goto error2;
2183                 cm_id->state = IB_CM_MRA_REQ_SENT;
2184                 break;
2185         case IB_CM_REP_RCVD:
2186                 ret = cm_alloc_msg(cm_id_priv, &msg);
2187                 if (ret)
2188                         goto error1;
2189
2190                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2191                               CM_MSG_RESPONSE_REP, service_timeout,
2192                               private_data, private_data_len);
2193                 ret = ib_post_send_mad(msg, NULL);
2194                 if (ret)
2195                         goto error2;
2196                 cm_id->state = IB_CM_MRA_REP_SENT;
2197                 break;
2198         case IB_CM_ESTABLISHED:
2199                 ret = cm_alloc_msg(cm_id_priv, &msg);
2200                 if (ret)
2201                         goto error1;
2202
2203                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2204                               CM_MSG_RESPONSE_OTHER, service_timeout,
2205                               private_data, private_data_len);
2206                 ret = ib_post_send_mad(msg, NULL);
2207                 if (ret)
2208                         goto error2;
2209                 cm_id->lap_state = IB_CM_MRA_LAP_SENT;
2210                 break;
2211         default:
2212                 ret = -EINVAL;
2213                 goto error1;
2214         }
2215         cm_id_priv->service_timeout = service_timeout;
2216         cm_set_private_data(cm_id_priv, data, private_data_len);
2217         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2218         return 0;
2219
2220 error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2221         kfree(data);
2222         return ret;
2223
2224 error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2225         kfree(data);
2226         cm_free_msg(msg);
2227         return ret;
2228 }
2229 EXPORT_SYMBOL(ib_send_cm_mra);
2230
2231 static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
2232 {
2233         switch (cm_mra_get_msg_mraed(mra_msg)) {
2234         case CM_MSG_RESPONSE_REQ:
2235                 return cm_acquire_id(mra_msg->remote_comm_id, 0);
2236         case CM_MSG_RESPONSE_REP:
2237         case CM_MSG_RESPONSE_OTHER:
2238                 return cm_acquire_id(mra_msg->remote_comm_id,
2239                                      mra_msg->local_comm_id);
2240         default:
2241                 return NULL;
2242         }
2243 }
2244
2245 static int cm_mra_handler(struct cm_work *work)
2246 {
2247         struct cm_id_private *cm_id_priv;
2248         struct cm_mra_msg *mra_msg;
2249         unsigned long flags;
2250         int timeout, ret;
2251
2252         mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
2253         cm_id_priv = cm_acquire_mraed_id(mra_msg);
2254         if (!cm_id_priv)
2255                 return -EINVAL;
2256
2257         work->cm_event.private_data = &mra_msg->private_data;
2258         work->cm_event.param.mra_rcvd.service_timeout =
2259                                         cm_mra_get_service_timeout(mra_msg);
2260         timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) +
2261                   cm_convert_to_ms(cm_id_priv->av.packet_life_time);
2262
2263         spin_lock_irqsave(&cm_id_priv->lock, flags);
2264         switch (cm_id_priv->id.state) {
2265         case IB_CM_REQ_SENT:
2266                 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ ||
2267                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
2268                                   cm_id_priv->msg, timeout))
2269                         goto out;
2270                 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
2271                 break;
2272         case IB_CM_REP_SENT:
2273                 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP ||
2274                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
2275                                   cm_id_priv->msg, timeout))
2276                         goto out;
2277                 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
2278                 break;
2279         case IB_CM_ESTABLISHED:
2280                 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER ||
2281                     cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
2282                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
2283                                   cm_id_priv->msg, timeout))
2284                         goto out;
2285                 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
2286                 break;
2287         default:
2288                 goto out;
2289         }
2290
2291         cm_id_priv->msg->context[1] = (void *) (unsigned long)
2292                                       cm_id_priv->id.state;
2293         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2294         if (!ret)
2295                 list_add_tail(&work->list, &cm_id_priv->work_list);
2296         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2297
2298         if (ret)
2299                 cm_process_work(cm_id_priv, work);
2300         else
2301                 cm_deref_id(cm_id_priv);
2302         return 0;
2303 out:
2304         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2305         cm_deref_id(cm_id_priv);
2306         return -EINVAL;
2307 }
2308
2309 static void cm_format_lap(struct cm_lap_msg *lap_msg,
2310                           struct cm_id_private *cm_id_priv,
2311                           struct ib_sa_path_rec *alternate_path,
2312                           const void *private_data,
2313                           u8 private_data_len)
2314 {
2315         cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID,
2316                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP));
2317         lap_msg->local_comm_id = cm_id_priv->id.local_id;
2318         lap_msg->remote_comm_id = cm_id_priv->id.remote_id;
2319         cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn);
2320         /* todo: need remote CM response timeout */
2321         cm_lap_set_remote_resp_timeout(lap_msg, 0x1F);
2322         lap_msg->alt_local_lid = alternate_path->slid;
2323         lap_msg->alt_remote_lid = alternate_path->dlid;
2324         lap_msg->alt_local_gid = alternate_path->sgid;
2325         lap_msg->alt_remote_gid = alternate_path->dgid;
2326         cm_lap_set_flow_label(lap_msg, alternate_path->flow_label);
2327         cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class);
2328         lap_msg->alt_hop_limit = alternate_path->hop_limit;
2329         cm_lap_set_packet_rate(lap_msg, alternate_path->rate);
2330         cm_lap_set_sl(lap_msg, alternate_path->sl);
2331         cm_lap_set_subnet_local(lap_msg, 1); /* local only... */
2332         cm_lap_set_local_ack_timeout(lap_msg,
2333                 min(31, alternate_path->packet_life_time + 1));
2334
2335         if (private_data && private_data_len)
2336                 memcpy(lap_msg->private_data, private_data, private_data_len);
2337 }
2338
2339 int ib_send_cm_lap(struct ib_cm_id *cm_id,
2340                    struct ib_sa_path_rec *alternate_path,
2341                    const void *private_data,
2342                    u8 private_data_len)
2343 {
2344         struct cm_id_private *cm_id_priv;
2345         struct ib_mad_send_buf *msg;
2346         unsigned long flags;
2347         int ret;
2348
2349         if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE)
2350                 return -EINVAL;
2351
2352         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2353         spin_lock_irqsave(&cm_id_priv->lock, flags);
2354         if (cm_id->state != IB_CM_ESTABLISHED ||
2355             cm_id->lap_state != IB_CM_LAP_IDLE) {
2356                 ret = -EINVAL;
2357                 goto out;
2358         }
2359
2360         ret = cm_alloc_msg(cm_id_priv, &msg);
2361         if (ret)
2362                 goto out;
2363
2364         cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv,
2365                       alternate_path, private_data, private_data_len);
2366         msg->timeout_ms = cm_id_priv->timeout_ms;
2367         msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED;
2368
2369         ret = ib_post_send_mad(msg, NULL);
2370         if (ret) {
2371                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2372                 cm_free_msg(msg);
2373                 return ret;
2374         }
2375
2376         cm_id->lap_state = IB_CM_LAP_SENT;
2377         cm_id_priv->msg = msg;
2378
2379 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2380         return ret;
2381 }
2382 EXPORT_SYMBOL(ib_send_cm_lap);
2383
2384 static void cm_format_path_from_lap(struct ib_sa_path_rec *path,
2385                                     struct cm_lap_msg *lap_msg)
2386 {
2387         memset(path, 0, sizeof *path);
2388         path->dgid = lap_msg->alt_local_gid;
2389         path->sgid = lap_msg->alt_remote_gid;
2390         path->dlid = lap_msg->alt_local_lid;
2391         path->slid = lap_msg->alt_remote_lid;
2392         path->flow_label = cm_lap_get_flow_label(lap_msg);
2393         path->hop_limit = lap_msg->alt_hop_limit;
2394         path->traffic_class = cm_lap_get_traffic_class(lap_msg);
2395         path->reversible = 1;
2396         /* pkey is same as in REQ */
2397         path->sl = cm_lap_get_sl(lap_msg);
2398         path->mtu_selector = IB_SA_EQ;
2399         /* mtu is same as in REQ */
2400         path->rate_selector = IB_SA_EQ;
2401         path->rate = cm_lap_get_packet_rate(lap_msg);
2402         path->packet_life_time_selector = IB_SA_EQ;
2403         path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg);
2404         path->packet_life_time -= (path->packet_life_time > 0);
2405 }
2406
2407 static int cm_lap_handler(struct cm_work *work)
2408 {
2409         struct cm_id_private *cm_id_priv;
2410         struct cm_lap_msg *lap_msg;
2411         struct ib_cm_lap_event_param *param;
2412         struct ib_mad_send_buf *msg = NULL;
2413         unsigned long flags;
2414         int ret;
2415
2416         /* todo: verify LAP request and send reject APR if invalid. */
2417         lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
2418         cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id,
2419                                    lap_msg->local_comm_id);
2420         if (!cm_id_priv)
2421                 return -EINVAL;
2422
2423         param = &work->cm_event.param.lap_rcvd;
2424         param->alternate_path = &work->path[0];
2425         cm_format_path_from_lap(param->alternate_path, lap_msg);
2426         work->cm_event.private_data = &lap_msg->private_data;
2427
2428         spin_lock_irqsave(&cm_id_priv->lock, flags);
2429         if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
2430                 goto unlock;
2431
2432         switch (cm_id_priv->id.lap_state) {
2433         case IB_CM_LAP_IDLE:
2434                 break;
2435         case IB_CM_MRA_LAP_SENT:
2436                 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2437                         goto unlock;
2438
2439                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2440                               CM_MSG_RESPONSE_OTHER,
2441                               cm_id_priv->service_timeout,
2442                               cm_id_priv->private_data,
2443                               cm_id_priv->private_data_len);
2444                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2445
2446                 if (ib_post_send_mad(msg, NULL))
2447                         cm_free_msg(msg);
2448                 goto deref;
2449         default:
2450                 goto unlock;
2451         }
2452
2453         cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
2454         cm_id_priv->tid = lap_msg->hdr.tid;
2455         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2456         if (!ret)
2457                 list_add_tail(&work->list, &cm_id_priv->work_list);
2458         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2459
2460         if (ret)
2461                 cm_process_work(cm_id_priv, work);
2462         else
2463                 cm_deref_id(cm_id_priv);
2464         return 0;
2465
2466 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2467 deref:  cm_deref_id(cm_id_priv);
2468         return -EINVAL;
2469 }
2470
2471 static void cm_format_apr(struct cm_apr_msg *apr_msg,
2472                           struct cm_id_private *cm_id_priv,
2473                           enum ib_cm_apr_status status,
2474                           void *info,
2475                           u8 info_length,
2476                           const void *private_data,
2477                           u8 private_data_len)
2478 {
2479         cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid);
2480         apr_msg->local_comm_id = cm_id_priv->id.local_id;
2481         apr_msg->remote_comm_id = cm_id_priv->id.remote_id;
2482         apr_msg->ap_status = (u8) status;
2483
2484         if (info && info_length) {
2485                 apr_msg->info_length = info_length;
2486                 memcpy(apr_msg->info, info, info_length);
2487         }
2488
2489         if (private_data && private_data_len)
2490                 memcpy(apr_msg->private_data, private_data, private_data_len);
2491 }
2492
2493 int ib_send_cm_apr(struct ib_cm_id *cm_id,
2494                    enum ib_cm_apr_status status,
2495                    void *info,
2496                    u8 info_length,
2497                    const void *private_data,
2498                    u8 private_data_len)
2499 {
2500         struct cm_id_private *cm_id_priv;
2501         struct ib_mad_send_buf *msg;
2502         unsigned long flags;
2503         int ret;
2504
2505         if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) ||
2506             (info && info_length > IB_CM_APR_INFO_LENGTH))
2507                 return -EINVAL;
2508
2509         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2510         spin_lock_irqsave(&cm_id_priv->lock, flags);
2511         if (cm_id->state != IB_CM_ESTABLISHED ||
2512             (cm_id->lap_state != IB_CM_LAP_RCVD &&
2513              cm_id->lap_state != IB_CM_MRA_LAP_SENT)) {
2514                 ret = -EINVAL;
2515                 goto out;
2516         }
2517
2518         ret = cm_alloc_msg(cm_id_priv, &msg);
2519         if (ret)
2520                 goto out;
2521
2522         cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status,
2523                       info, info_length, private_data, private_data_len);
2524         ret = ib_post_send_mad(msg, NULL);
2525         if (ret) {
2526                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2527                 cm_free_msg(msg);
2528                 return ret;
2529         }
2530
2531         cm_id->lap_state = IB_CM_LAP_IDLE;
2532 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2533         return ret;
2534 }
2535 EXPORT_SYMBOL(ib_send_cm_apr);
2536
2537 static int cm_apr_handler(struct cm_work *work)
2538 {
2539         struct cm_id_private *cm_id_priv;
2540         struct cm_apr_msg *apr_msg;
2541         unsigned long flags;
2542         int ret;
2543
2544         apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
2545         cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id,
2546                                    apr_msg->local_comm_id);
2547         if (!cm_id_priv)
2548                 return -EINVAL; /* Unmatched reply. */
2549
2550         work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status;
2551         work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info;
2552         work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length;
2553         work->cm_event.private_data = &apr_msg->private_data;
2554
2555         spin_lock_irqsave(&cm_id_priv->lock, flags);
2556         if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
2557             (cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
2558              cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
2559                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2560                 goto out;
2561         }
2562         cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
2563         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2564         cm_id_priv->msg = NULL;
2565
2566         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2567         if (!ret)
2568                 list_add_tail(&work->list, &cm_id_priv->work_list);
2569         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2570
2571         if (ret)
2572                 cm_process_work(cm_id_priv, work);
2573         else
2574                 cm_deref_id(cm_id_priv);
2575         return 0;
2576 out:
2577         cm_deref_id(cm_id_priv);
2578         return -EINVAL;
2579 }
2580
2581 static int cm_timewait_handler(struct cm_work *work)
2582 {
2583         struct cm_timewait_info *timewait_info;
2584         struct cm_id_private *cm_id_priv;
2585         unsigned long flags;
2586         int ret;
2587
2588         timewait_info = (struct cm_timewait_info *)work;
2589         cm_cleanup_timewait(timewait_info);
2590
2591         cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
2592                                    timewait_info->work.remote_id);
2593         if (!cm_id_priv)
2594                 return -EINVAL;
2595
2596         spin_lock_irqsave(&cm_id_priv->lock, flags);
2597         if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
2598             cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
2599                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2600                 goto out;
2601         }
2602         cm_id_priv->id.state = IB_CM_IDLE;
2603         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2604         if (!ret)
2605                 list_add_tail(&work->list, &cm_id_priv->work_list);
2606         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2607
2608         if (ret)
2609                 cm_process_work(cm_id_priv, work);
2610         else
2611                 cm_deref_id(cm_id_priv);
2612         return 0;
2613 out:
2614         cm_deref_id(cm_id_priv);
2615         return -EINVAL;
2616 }
2617
2618 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
2619                                struct cm_id_private *cm_id_priv,
2620                                struct ib_cm_sidr_req_param *param)
2621 {
2622         cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
2623                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR));
2624         sidr_req_msg->request_id = cm_id_priv->id.local_id;
2625         sidr_req_msg->pkey = cpu_to_be16(param->path->pkey);
2626         sidr_req_msg->service_id = param->service_id;
2627
2628         if (param->private_data && param->private_data_len)
2629                 memcpy(sidr_req_msg->private_data, param->private_data,
2630                        param->private_data_len);
2631 }
2632
2633 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
2634                         struct ib_cm_sidr_req_param *param)
2635 {
2636         struct cm_id_private *cm_id_priv;
2637         struct ib_mad_send_buf *msg;
2638         unsigned long flags;
2639         int ret;
2640
2641         if (!param->path || (param->private_data &&
2642              param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
2643                 return -EINVAL;
2644
2645         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2646         ret = cm_init_av_by_path(param->path, &cm_id_priv->av);
2647         if (ret)
2648                 goto out;
2649
2650         cm_id->service_id = param->service_id;
2651         cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
2652         cm_id_priv->timeout_ms = param->timeout_ms;
2653         cm_id_priv->max_cm_retries = param->max_cm_retries;
2654         ret = cm_alloc_msg(cm_id_priv, &msg);
2655         if (ret)
2656                 goto out;
2657
2658         cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv,
2659                            param);
2660         msg->timeout_ms = cm_id_priv->timeout_ms;
2661         msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT;
2662
2663         spin_lock_irqsave(&cm_id_priv->lock, flags);
2664         if (cm_id->state == IB_CM_IDLE)
2665                 ret = ib_post_send_mad(msg, NULL);
2666         else
2667                 ret = -EINVAL;
2668
2669         if (ret) {
2670                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2671                 cm_free_msg(msg);
2672                 goto out;
2673         }
2674         cm_id->state = IB_CM_SIDR_REQ_SENT;
2675         cm_id_priv->msg = msg;
2676         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2677 out:
2678         return ret;
2679 }
2680 EXPORT_SYMBOL(ib_send_cm_sidr_req);
2681
2682 static void cm_format_sidr_req_event(struct cm_work *work,
2683                                      struct ib_cm_id *listen_id)
2684 {
2685         struct cm_sidr_req_msg *sidr_req_msg;
2686         struct ib_cm_sidr_req_event_param *param;
2687
2688         sidr_req_msg = (struct cm_sidr_req_msg *)
2689                                 work->mad_recv_wc->recv_buf.mad;
2690         param = &work->cm_event.param.sidr_req_rcvd;
2691         param->pkey = __be16_to_cpu(sidr_req_msg->pkey);
2692         param->listen_id = listen_id;
2693         param->port = work->port->port_num;
2694         work->cm_event.private_data = &sidr_req_msg->private_data;
2695 }
2696
2697 static int cm_sidr_req_handler(struct cm_work *work)
2698 {
2699         struct ib_cm_id *cm_id;
2700         struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
2701         struct cm_sidr_req_msg *sidr_req_msg;
2702         struct ib_wc *wc;
2703         unsigned long flags;
2704
2705         cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL);
2706         if (IS_ERR(cm_id))
2707                 return PTR_ERR(cm_id);
2708         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2709
2710         /* Record SGID/SLID and request ID for lookup. */
2711         sidr_req_msg = (struct cm_sidr_req_msg *)
2712                                 work->mad_recv_wc->recv_buf.mad;
2713         wc = work->mad_recv_wc->wc;
2714         cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid);
2715         cm_id_priv->av.dgid.global.interface_id = 0;
2716         cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2717                                 work->mad_recv_wc->recv_buf.grh,
2718                                 &cm_id_priv->av);
2719         cm_id_priv->id.remote_id = sidr_req_msg->request_id;
2720         cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
2721         cm_id_priv->tid = sidr_req_msg->hdr.tid;
2722         atomic_inc(&cm_id_priv->work_count);
2723
2724         spin_lock_irqsave(&cm.lock, flags);
2725         cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
2726         if (cur_cm_id_priv) {
2727                 spin_unlock_irqrestore(&cm.lock, flags);
2728                 goto out; /* Duplicate message. */
2729         }
2730         cur_cm_id_priv = cm_find_listen(cm_id->device,
2731                                         sidr_req_msg->service_id,
2732                                         sidr_req_msg->private_data);
2733         if (!cur_cm_id_priv) {
2734                 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
2735                 spin_unlock_irqrestore(&cm.lock, flags);
2736                 /* todo: reply with no match */
2737                 goto out; /* No match. */
2738         }
2739         atomic_inc(&cur_cm_id_priv->refcount);
2740         spin_unlock_irqrestore(&cm.lock, flags);
2741
2742         cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler;
2743         cm_id_priv->id.context = cur_cm_id_priv->id.context;
2744         cm_id_priv->id.service_id = sidr_req_msg->service_id;
2745         cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL);
2746
2747         cm_format_sidr_req_event(work, &cur_cm_id_priv->id);
2748         cm_process_work(cm_id_priv, work);
2749         cm_deref_id(cur_cm_id_priv);
2750         return 0;
2751 out:
2752         ib_destroy_cm_id(&cm_id_priv->id);
2753         return -EINVAL;
2754 }
2755
2756 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
2757                                struct cm_id_private *cm_id_priv,
2758                                struct ib_cm_sidr_rep_param *param)
2759 {
2760         cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
2761                           cm_id_priv->tid);
2762         sidr_rep_msg->request_id = cm_id_priv->id.remote_id;
2763         sidr_rep_msg->status = param->status;
2764         cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num));
2765         sidr_rep_msg->service_id = cm_id_priv->id.service_id;
2766         sidr_rep_msg->qkey = cpu_to_be32(param->qkey);
2767
2768         if (param->info && param->info_length)
2769                 memcpy(sidr_rep_msg->info, param->info, param->info_length);
2770
2771         if (param->private_data && param->private_data_len)
2772                 memcpy(sidr_rep_msg->private_data, param->private_data,
2773                        param->private_data_len);
2774 }
2775
2776 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
2777                         struct ib_cm_sidr_rep_param *param)
2778 {
2779         struct cm_id_private *cm_id_priv;
2780         struct ib_mad_send_buf *msg;
2781         unsigned long flags;
2782         int ret;
2783
2784         if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
2785             (param->private_data &&
2786              param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE))
2787                 return -EINVAL;
2788
2789         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2790         spin_lock_irqsave(&cm_id_priv->lock, flags);
2791         if (cm_id->state != IB_CM_SIDR_REQ_RCVD) {
2792                 ret = -EINVAL;
2793                 goto error;
2794         }
2795
2796         ret = cm_alloc_msg(cm_id_priv, &msg);
2797         if (ret)
2798                 goto error;
2799
2800         cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
2801                            param);
2802         ret = ib_post_send_mad(msg, NULL);
2803         if (ret) {
2804                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2805                 cm_free_msg(msg);
2806                 return ret;
2807         }
2808         cm_id->state = IB_CM_IDLE;
2809         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2810
2811         spin_lock_irqsave(&cm.lock, flags);
2812         rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
2813         spin_unlock_irqrestore(&cm.lock, flags);
2814         return 0;
2815
2816 error:  spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2817         return ret;
2818 }
2819 EXPORT_SYMBOL(ib_send_cm_sidr_rep);
2820
2821 static void cm_format_sidr_rep_event(struct cm_work *work)
2822 {
2823         struct cm_sidr_rep_msg *sidr_rep_msg;
2824         struct ib_cm_sidr_rep_event_param *param;
2825
2826         sidr_rep_msg = (struct cm_sidr_rep_msg *)
2827                                 work->mad_recv_wc->recv_buf.mad;
2828         param = &work->cm_event.param.sidr_rep_rcvd;
2829         param->status = sidr_rep_msg->status;
2830         param->qkey = be32_to_cpu(sidr_rep_msg->qkey);
2831         param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg));
2832         param->info = &sidr_rep_msg->info;
2833         param->info_len = sidr_rep_msg->info_length;
2834         work->cm_event.private_data = &sidr_rep_msg->private_data;
2835 }
2836
2837 static int cm_sidr_rep_handler(struct cm_work *work)
2838 {
2839         struct cm_sidr_rep_msg *sidr_rep_msg;
2840         struct cm_id_private *cm_id_priv;
2841         unsigned long flags;
2842
2843         sidr_rep_msg = (struct cm_sidr_rep_msg *)
2844                                 work->mad_recv_wc->recv_buf.mad;
2845         cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0);
2846         if (!cm_id_priv)
2847                 return -EINVAL; /* Unmatched reply. */
2848
2849         spin_lock_irqsave(&cm_id_priv->lock, flags);
2850         if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
2851                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2852                 goto out;
2853         }
2854         cm_id_priv->id.state = IB_CM_IDLE;
2855         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2856         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2857
2858         cm_format_sidr_rep_event(work);
2859         cm_process_work(cm_id_priv, work);
2860         return 0;
2861 out:
2862         cm_deref_id(cm_id_priv);
2863         return -EINVAL;
2864 }
2865
2866 static void cm_process_send_error(struct ib_mad_send_buf *msg,
2867                                   enum ib_wc_status wc_status)
2868 {
2869         struct cm_id_private *cm_id_priv;
2870         struct ib_cm_event cm_event;
2871         enum ib_cm_state state;
2872         unsigned long flags;
2873         int ret;
2874
2875         memset(&cm_event, 0, sizeof cm_event);
2876         cm_id_priv = msg->context[0];
2877
2878         /* Discard old sends or ones without a response. */
2879         spin_lock_irqsave(&cm_id_priv->lock, flags);
2880         state = (enum ib_cm_state) (unsigned long) msg->context[1];
2881         if (msg != cm_id_priv->msg || state != cm_id_priv->id.state)
2882                 goto discard;
2883
2884         switch (state) {
2885         case IB_CM_REQ_SENT:
2886         case IB_CM_MRA_REQ_RCVD:
2887                 cm_reset_to_idle(cm_id_priv);
2888                 cm_event.event = IB_CM_REQ_ERROR;
2889                 break;
2890         case IB_CM_REP_SENT:
2891         case IB_CM_MRA_REP_RCVD:
2892                 cm_reset_to_idle(cm_id_priv);
2893                 cm_event.event = IB_CM_REP_ERROR;
2894                 break;
2895         case IB_CM_DREQ_SENT:
2896                 cm_enter_timewait(cm_id_priv);
2897                 cm_event.event = IB_CM_DREQ_ERROR;
2898                 break;
2899         case IB_CM_SIDR_REQ_SENT:
2900                 cm_id_priv->id.state = IB_CM_IDLE;
2901                 cm_event.event = IB_CM_SIDR_REQ_ERROR;
2902                 break;
2903         default:
2904                 goto discard;
2905         }
2906         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2907         cm_event.param.send_status = wc_status;
2908
2909         /* No other events can occur on the cm_id at this point. */
2910         ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
2911         cm_free_msg(msg);
2912         if (ret)
2913                 ib_destroy_cm_id(&cm_id_priv->id);
2914         return;
2915 discard:
2916         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2917         cm_free_msg(msg);
2918 }
2919
2920 static void cm_send_handler(struct ib_mad_agent *mad_agent,
2921                             struct ib_mad_send_wc *mad_send_wc)
2922 {
2923         struct ib_mad_send_buf *msg = mad_send_wc->send_buf;
2924
2925         switch (mad_send_wc->status) {
2926         case IB_WC_SUCCESS:
2927         case IB_WC_WR_FLUSH_ERR:
2928                 cm_free_msg(msg);
2929                 break;
2930         default:
2931                 if (msg->context[0] && msg->context[1])
2932                         cm_process_send_error(msg, mad_send_wc->status);
2933                 else
2934                         cm_free_msg(msg);
2935                 break;
2936         }
2937 }
2938
2939 static void cm_work_handler(void *data)
2940 {
2941         struct cm_work *work = data;
2942         int ret;
2943
2944         switch (work->cm_event.event) {
2945         case IB_CM_REQ_RECEIVED:
2946                 ret = cm_req_handler(work);
2947                 break;
2948         case IB_CM_MRA_RECEIVED:
2949                 ret = cm_mra_handler(work);
2950                 break;
2951         case IB_CM_REJ_RECEIVED:
2952                 ret = cm_rej_handler(work);
2953                 break;
2954         case IB_CM_REP_RECEIVED:
2955                 ret = cm_rep_handler(work);
2956                 break;
2957         case IB_CM_RTU_RECEIVED:
2958                 ret = cm_rtu_handler(work);
2959                 break;
2960         case IB_CM_USER_ESTABLISHED:
2961                 ret = cm_establish_handler(work);
2962                 break;
2963         case IB_CM_DREQ_RECEIVED:
2964                 ret = cm_dreq_handler(work);
2965                 break;
2966         case IB_CM_DREP_RECEIVED:
2967                 ret = cm_drep_handler(work);
2968                 break;
2969         case IB_CM_SIDR_REQ_RECEIVED:
2970                 ret = cm_sidr_req_handler(work);
2971                 break;
2972         case IB_CM_SIDR_REP_RECEIVED:
2973                 ret = cm_sidr_rep_handler(work);
2974                 break;
2975         case IB_CM_LAP_RECEIVED:
2976                 ret = cm_lap_handler(work);
2977                 break;
2978         case IB_CM_APR_RECEIVED:
2979                 ret = cm_apr_handler(work);
2980                 break;
2981         case IB_CM_TIMEWAIT_EXIT:
2982                 ret = cm_timewait_handler(work);
2983                 break;
2984         default:
2985                 ret = -EINVAL;
2986                 break;
2987         }
2988         if (ret)
2989                 cm_free_work(work);
2990 }
2991
2992 int ib_cm_establish(struct ib_cm_id *cm_id)
2993 {
2994         struct cm_id_private *cm_id_priv;
2995         struct cm_work *work;
2996         unsigned long flags;
2997         int ret = 0;
2998
2999         work = kmalloc(sizeof *work, GFP_ATOMIC);
3000         if (!work)
3001                 return -ENOMEM;
3002
3003         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3004         spin_lock_irqsave(&cm_id_priv->lock, flags);
3005         switch (cm_id->state)
3006         {
3007         case IB_CM_REP_SENT:
3008         case IB_CM_MRA_REP_RCVD:
3009                 cm_id->state = IB_CM_ESTABLISHED;
3010                 break;
3011         case IB_CM_ESTABLISHED:
3012                 ret = -EISCONN;
3013                 break;
3014         default:
3015                 ret = -EINVAL;
3016                 break;
3017         }
3018         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3019
3020         if (ret) {
3021                 kfree(work);
3022                 goto out;
3023         }
3024
3025         /*
3026          * The CM worker thread may try to destroy the cm_id before it
3027          * can execute this work item.  To prevent potential deadlock,
3028          * we need to find the cm_id once we're in the context of the
3029          * worker thread, rather than holding a reference on it.
3030          */
3031         INIT_WORK(&work->work, cm_work_handler, work);
3032         work->local_id = cm_id->local_id;
3033         work->remote_id = cm_id->remote_id;
3034         work->mad_recv_wc = NULL;
3035         work->cm_event.event = IB_CM_USER_ESTABLISHED;
3036         queue_work(cm.wq, &work->work);
3037 out:
3038         return ret;
3039 }
3040 EXPORT_SYMBOL(ib_cm_establish);
3041
3042 static void cm_recv_handler(struct ib_mad_agent *mad_agent,
3043                             struct ib_mad_recv_wc *mad_recv_wc)
3044 {
3045         struct cm_work *work;
3046         enum ib_cm_event_type event;
3047         int paths = 0;
3048
3049         switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
3050         case CM_REQ_ATTR_ID:
3051                 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)->
3052                                                     alt_local_lid != 0);
3053                 event = IB_CM_REQ_RECEIVED;
3054                 break;
3055         case CM_MRA_ATTR_ID:
3056                 event = IB_CM_MRA_RECEIVED;
3057                 break;
3058         case CM_REJ_ATTR_ID:
3059                 event = IB_CM_REJ_RECEIVED;
3060                 break;
3061         case CM_REP_ATTR_ID:
3062                 event = IB_CM_REP_RECEIVED;
3063                 break;
3064         case CM_RTU_ATTR_ID:
3065                 event = IB_CM_RTU_RECEIVED;
3066                 break;
3067         case CM_DREQ_ATTR_ID:
3068                 event = IB_CM_DREQ_RECEIVED;
3069                 break;
3070         case CM_DREP_ATTR_ID:
3071                 event = IB_CM_DREP_RECEIVED;
3072                 break;
3073         case CM_SIDR_REQ_ATTR_ID:
3074                 event = IB_CM_SIDR_REQ_RECEIVED;
3075                 break;
3076         case CM_SIDR_REP_ATTR_ID:
3077                 event = IB_CM_SIDR_REP_RECEIVED;
3078                 break;
3079         case CM_LAP_ATTR_ID:
3080                 paths = 1;
3081                 event = IB_CM_LAP_RECEIVED;
3082                 break;
3083         case CM_APR_ATTR_ID:
3084                 event = IB_CM_APR_RECEIVED;
3085                 break;
3086         default:
3087                 ib_free_recv_mad(mad_recv_wc);
3088                 return;
3089         }
3090
3091         work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths,
3092                        GFP_KERNEL);
3093         if (!work) {
3094                 ib_free_recv_mad(mad_recv_wc);
3095                 return;
3096         }
3097
3098         INIT_WORK(&work->work, cm_work_handler, work);
3099         work->cm_event.event = event;
3100         work->mad_recv_wc = mad_recv_wc;
3101         work->port = (struct cm_port *)mad_agent->context;
3102         queue_work(cm.wq, &work->work);
3103 }
3104
3105 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
3106                                 struct ib_qp_attr *qp_attr,
3107                                 int *qp_attr_mask)
3108 {
3109         unsigned long flags;
3110         int ret;
3111
3112         spin_lock_irqsave(&cm_id_priv->lock, flags);
3113         switch (cm_id_priv->id.state) {
3114         case IB_CM_REQ_SENT:
3115         case IB_CM_MRA_REQ_RCVD:
3116         case IB_CM_REQ_RCVD:
3117         case IB_CM_MRA_REQ_SENT:
3118         case IB_CM_REP_RCVD:
3119         case IB_CM_MRA_REP_SENT:
3120         case IB_CM_REP_SENT:
3121         case IB_CM_MRA_REP_RCVD:
3122         case IB_CM_ESTABLISHED:
3123                 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
3124                                 IB_QP_PKEY_INDEX | IB_QP_PORT;
3125                 qp_attr->qp_access_flags = IB_ACCESS_LOCAL_WRITE |
3126                                            IB_ACCESS_REMOTE_WRITE;
3127                 if (cm_id_priv->responder_resources)
3128                         qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ;
3129                 qp_attr->pkey_index = cm_id_priv->av.pkey_index;
3130                 qp_attr->port_num = cm_id_priv->av.port->port_num;
3131                 ret = 0;
3132                 break;
3133         default:
3134                 ret = -EINVAL;
3135                 break;
3136         }
3137         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3138         return ret;
3139 }
3140
3141 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
3142                                struct ib_qp_attr *qp_attr,
3143                                int *qp_attr_mask)
3144 {
3145         unsigned long flags;
3146         int ret;
3147
3148         spin_lock_irqsave(&cm_id_priv->lock, flags);
3149         switch (cm_id_priv->id.state) {
3150         case IB_CM_REQ_RCVD:
3151         case IB_CM_MRA_REQ_SENT:
3152         case IB_CM_REP_RCVD:
3153         case IB_CM_MRA_REP_SENT:
3154         case IB_CM_REP_SENT:
3155         case IB_CM_MRA_REP_RCVD:
3156         case IB_CM_ESTABLISHED:
3157                 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
3158                                 IB_QP_DEST_QPN | IB_QP_RQ_PSN;
3159                 qp_attr->ah_attr = cm_id_priv->av.ah_attr;
3160                 qp_attr->path_mtu = cm_id_priv->path_mtu;
3161                 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
3162                 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
3163                 if (cm_id_priv->qp_type == IB_QPT_RC) {
3164                         *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC |
3165                                          IB_QP_MIN_RNR_TIMER;
3166                         qp_attr->max_dest_rd_atomic =
3167                                         cm_id_priv->responder_resources;
3168                         qp_attr->min_rnr_timer = 0;
3169                 }
3170                 if (cm_id_priv->alt_av.ah_attr.dlid) {
3171                         *qp_attr_mask |= IB_QP_ALT_PATH;
3172                         qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
3173                         qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3174                 }
3175                 ret = 0;
3176                 break;
3177         default:
3178                 ret = -EINVAL;
3179                 break;
3180         }
3181         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3182         return ret;
3183 }
3184
3185 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv,
3186                                struct ib_qp_attr *qp_attr,
3187                                int *qp_attr_mask)
3188 {
3189         unsigned long flags;
3190         int ret;
3191
3192         spin_lock_irqsave(&cm_id_priv->lock, flags);
3193         switch (cm_id_priv->id.state) {
3194         case IB_CM_REP_RCVD:
3195         case IB_CM_MRA_REP_SENT:
3196         case IB_CM_REP_SENT:
3197         case IB_CM_MRA_REP_RCVD:
3198         case IB_CM_ESTABLISHED:
3199                 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN;
3200                 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn);
3201                 if (cm_id_priv->qp_type == IB_QPT_RC) {
3202                         *qp_attr_mask |= IB_QP_TIMEOUT | IB_QP_RETRY_CNT |
3203                                          IB_QP_RNR_RETRY |
3204                                          IB_QP_MAX_QP_RD_ATOMIC;
3205                         qp_attr->timeout = cm_id_priv->local_ack_timeout;
3206                         qp_attr->retry_cnt = cm_id_priv->retry_count;
3207                         qp_attr->rnr_retry = cm_id_priv->rnr_retry_count;
3208                         qp_attr->max_rd_atomic = cm_id_priv->initiator_depth;
3209                 }
3210                 if (cm_id_priv->alt_av.ah_attr.dlid) {
3211                         *qp_attr_mask |= IB_QP_PATH_MIG_STATE;
3212                         qp_attr->path_mig_state = IB_MIG_REARM;
3213                 }
3214                 ret = 0;
3215                 break;
3216         default:
3217                 ret = -EINVAL;
3218                 break;
3219         }
3220         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3221         return ret;
3222 }
3223
3224 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
3225                        struct ib_qp_attr *qp_attr,
3226                        int *qp_attr_mask)
3227 {
3228         struct cm_id_private *cm_id_priv;
3229         int ret;
3230
3231         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3232         switch (qp_attr->qp_state) {
3233         case IB_QPS_INIT:
3234                 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask);
3235                 break;
3236         case IB_QPS_RTR:
3237                 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask);
3238                 break;
3239         case IB_QPS_RTS:
3240                 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask);
3241                 break;
3242         default:
3243                 ret = -EINVAL;
3244                 break;
3245         }
3246         return ret;
3247 }
3248 EXPORT_SYMBOL(ib_cm_init_qp_attr);
3249
3250 static void cm_add_one(struct ib_device *device)
3251 {
3252         struct cm_device *cm_dev;
3253         struct cm_port *port;
3254         struct ib_mad_reg_req reg_req = {
3255                 .mgmt_class = IB_MGMT_CLASS_CM,
3256                 .mgmt_class_version = IB_CM_CLASS_VERSION
3257         };
3258         struct ib_port_modify port_modify = {
3259                 .set_port_cap_mask = IB_PORT_CM_SUP
3260         };
3261         unsigned long flags;
3262         int ret;
3263         u8 i;
3264
3265         cm_dev = kmalloc(sizeof(*cm_dev) + sizeof(*port) *
3266                          device->phys_port_cnt, GFP_KERNEL);
3267         if (!cm_dev)
3268                 return;
3269
3270         cm_dev->device = device;
3271         cm_dev->ca_guid = device->node_guid;
3272
3273         set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
3274         for (i = 1; i <= device->phys_port_cnt; i++) {
3275                 port = &cm_dev->port[i-1];
3276                 port->cm_dev = cm_dev;
3277                 port->port_num = i;
3278                 port->mad_agent = ib_register_mad_agent(device, i,
3279                                                         IB_QPT_GSI,
3280                                                         &reg_req,
3281                                                         0,
3282                                                         cm_send_handler,
3283                                                         cm_recv_handler,
3284                                                         port);
3285                 if (IS_ERR(port->mad_agent))
3286                         goto error1;
3287
3288                 ret = ib_modify_port(device, i, 0, &port_modify);
3289                 if (ret)
3290                         goto error2;
3291         }
3292         ib_set_client_data(device, &cm_client, cm_dev);
3293
3294         write_lock_irqsave(&cm.device_lock, flags);
3295         list_add_tail(&cm_dev->list, &cm.device_list);
3296         write_unlock_irqrestore(&cm.device_lock, flags);
3297         return;
3298
3299 error2:
3300         ib_unregister_mad_agent(port->mad_agent);
3301 error1:
3302         port_modify.set_port_cap_mask = 0;
3303         port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
3304         while (--i) {
3305                 port = &cm_dev->port[i-1];
3306                 ib_modify_port(device, port->port_num, 0, &port_modify);
3307                 ib_unregister_mad_agent(port->mad_agent);
3308         }
3309         kfree(cm_dev);
3310 }
3311
3312 static void cm_remove_one(struct ib_device *device)
3313 {
3314         struct cm_device *cm_dev;
3315         struct cm_port *port;
3316         struct ib_port_modify port_modify = {
3317                 .clr_port_cap_mask = IB_PORT_CM_SUP
3318         };
3319         unsigned long flags;
3320         int i;
3321
3322         cm_dev = ib_get_client_data(device, &cm_client);
3323         if (!cm_dev)
3324                 return;
3325
3326         write_lock_irqsave(&cm.device_lock, flags);
3327         list_del(&cm_dev->list);
3328         write_unlock_irqrestore(&cm.device_lock, flags);
3329
3330         for (i = 1; i <= device->phys_port_cnt; i++) {
3331                 port = &cm_dev->port[i-1];
3332                 ib_modify_port(device, port->port_num, 0, &port_modify);
3333                 ib_unregister_mad_agent(port->mad_agent);
3334         }
3335         kfree(cm_dev);
3336 }
3337
3338 static int __init ib_cm_init(void)
3339 {
3340         int ret;
3341
3342         memset(&cm, 0, sizeof cm);
3343         INIT_LIST_HEAD(&cm.device_list);
3344         rwlock_init(&cm.device_lock);
3345         spin_lock_init(&cm.lock);
3346         cm.listen_service_table = RB_ROOT;
3347         cm.listen_service_id = __constant_be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID);
3348         cm.remote_id_table = RB_ROOT;
3349         cm.remote_qp_table = RB_ROOT;
3350         cm.remote_sidr_table = RB_ROOT;
3351         idr_init(&cm.local_id_table);
3352         idr_pre_get(&cm.local_id_table, GFP_KERNEL);
3353
3354         cm.wq = create_workqueue("ib_cm");
3355         if (!cm.wq)
3356                 return -ENOMEM;
3357
3358         ret = ib_register_client(&cm_client);
3359         if (ret)
3360                 goto error;
3361
3362         return 0;
3363 error:
3364         destroy_workqueue(cm.wq);
3365         return ret;
3366 }
3367
3368 static void __exit ib_cm_cleanup(void)
3369 {
3370         destroy_workqueue(cm.wq);
3371         ib_unregister_client(&cm_client);
3372         idr_destroy(&cm.local_id_table);
3373 }
3374
3375 module_init(ib_cm_init);
3376 module_exit(ib_cm_cleanup);
3377