drivers/infiniband/core/cm.c

   1 /*
   2  * Copyright (c) 2004, 2005 Intel Corporation.  All rights reserved.
   3  * Copyright (c) 2004 Topspin Corporation.  All rights reserved.
   4  * Copyright (c) 2004, 2005 Voltaire Corporation.  All rights reserved.
   5  * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
   6  *
   7  * This software is available to you under a choice of one of two
   8  * licenses.  You may choose to be licensed under the terms of the GNU
   9  * General Public License (GPL) Version 2, available from the file
  10  * COPYING in the main directory of this source tree, or the
  11  * OpenIB.org BSD license below:
  12  *
  13  *     Redistribution and use in source and binary forms, with or
  14  *     without modification, are permitted provided that the following
  15  *     conditions are met:
  16  *
  17  *      - Redistributions of source code must retain the above
  18  *        copyright notice, this list of conditions and the following
  19  *        disclaimer.
  20  *
  21  *      - Redistributions in binary form must reproduce the above
  22  *        copyright notice, this list of conditions and the following
  23  *        disclaimer in the documentation and/or other materials
  24  *        provided with the distribution.
  25  *
  26  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  27  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  28  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  29  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  30  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  31  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  32  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  33  * SOFTWARE.
  34  *
  35  * $Id: cm.c 2821 2005-07-08 17:07:28Z sean.hefty $
  36  */
  37 #include <linux/dma-mapping.h>
  38 #include <linux/err.h>
  39 #include <linux/idr.h>
  40 #include <linux/interrupt.h>
  41 #include <linux/pci.h>
  42 #include <linux/rbtree.h>
  43 #include <linux/spinlock.h>
  44 #include <linux/workqueue.h>
  45
  46 #include <rdma/ib_cache.h>
  47 #include <rdma/ib_cm.h>
  48 #include "cm_msgs.h"
  49
  50 MODULE_AUTHOR("Sean Hefty");
  51 MODULE_DESCRIPTION("InfiniBand CM");
  52 MODULE_LICENSE("Dual BSD/GPL");
  53
  54 static void cm_add_one(struct ib_device *device);
  55 static void cm_remove_one(struct ib_device *device);
  56
  57 static struct ib_client cm_client = {
  58         .name   = "cm",
  59         .add    = cm_add_one,
  60         .remove = cm_remove_one
  61 };
  62
  63 static struct ib_cm {
  64         spinlock_t lock;
  65         struct list_head device_list;
  66         rwlock_t device_lock;
  67         struct rb_root listen_service_table;
  68         u64 listen_service_id;
  69         /* struct rb_root peer_service_table; todo: fix peer to peer */
  70         struct rb_root remote_qp_table;
  71         struct rb_root remote_id_table;
  72         struct rb_root remote_sidr_table;
  73         struct idr local_id_table;
  74         struct workqueue_struct *wq;
  75 } cm;
  76
  77 struct cm_port {
  78         struct cm_device *cm_dev;
  79         struct ib_mad_agent *mad_agent;
  80         u8 port_num;
  81 };
  82
  83 struct cm_device {
  84         struct list_head list;
  85         struct ib_device *device;
  86         __be64 ca_guid;
  87         struct cm_port port[0];
  88 };
  89
  90 struct cm_av {
  91         struct cm_port *port;
  92         union ib_gid dgid;
  93         struct ib_ah_attr ah_attr;
  94         u16 pkey_index;
  95         u8 packet_life_time;
  96 };
  97
  98 struct cm_work {
  99         struct work_struct work;
 100         struct list_head list;
 101         struct cm_port *port;
 102         struct ib_mad_recv_wc *mad_recv_wc;     /* Received MADs */
 103         __be32 local_id;                        /* Established / timewait */
 104         __be32 remote_id;
 105         struct ib_cm_event cm_event;
 106         struct ib_sa_path_rec path[0];
 107 };
 108
 109 struct cm_timewait_info {
 110         struct cm_work work;                    /* Must be first. */
 111         struct rb_node remote_qp_node;
 112         struct rb_node remote_id_node;
 113         __be64 remote_ca_guid;
 114         __be32 remote_qpn;
 115         u8 inserted_remote_qp;
 116         u8 inserted_remote_id;
 117 };
 118
 119 struct cm_id_private {
 120         struct ib_cm_id id;
 121
 122         struct rb_node service_node;
 123         struct rb_node sidr_id_node;
 124         spinlock_t lock;
 125         wait_queue_head_t wait;
 126         atomic_t refcount;
 127
 128         struct ib_mad_send_buf *msg;
 129         struct cm_timewait_info *timewait_info;
 130         /* todo: use alternate port on send failure */
 131         struct cm_av av;
 132         struct cm_av alt_av;
 133
 134         void *private_data;
 135         __be64 tid;
 136         __be32 local_qpn;
 137         __be32 remote_qpn;
 138         enum ib_qp_type qp_type;
 139         __be32 sq_psn;
 140         __be32 rq_psn;
 141         int timeout_ms;
 142         enum ib_mtu path_mtu;
 143         u8 private_data_len;
 144         u8 max_cm_retries;
 145         u8 peer_to_peer;
 146         u8 responder_resources;
 147         u8 initiator_depth;
 148         u8 local_ack_timeout;
 149         u8 retry_count;
 150         u8 rnr_retry_count;
 151         u8 service_timeout;
 152
 153         struct list_head work_list;
 154         atomic_t work_count;
 155 };
 156
 157 static void cm_work_handler(void *data);
 158
 159 static inline void cm_deref_id(struct cm_id_private *cm_id_priv)
 160 {
 161         if (atomic_dec_and_test(&cm_id_priv->refcount))
 162                 wake_up(&cm_id_priv->wait);
 163 }
 164
 165 static int cm_alloc_msg(struct cm_id_private *cm_id_priv,
 166                         struct ib_mad_send_buf **msg)
 167 {
 168         struct ib_mad_agent *mad_agent;
 169         struct ib_mad_send_buf *m;
 170         struct ib_ah *ah;
 171
 172         mad_agent = cm_id_priv->av.port->mad_agent;
 173         ah = ib_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr);
 174         if (IS_ERR(ah))
 175                 return PTR_ERR(ah);
 176
 177         m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn,
 178                                cm_id_priv->av.pkey_index,
 179                                0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
 180                                GFP_ATOMIC);
 181         if (IS_ERR(m)) {
 182                 ib_destroy_ah(ah);
 183                 return PTR_ERR(m);
 184         }
 185
 186         /* Timeout set by caller if response is expected. */
 187         m->ah = ah;
 188         m->retries = cm_id_priv->max_cm_retries;
 189
 190         atomic_inc(&cm_id_priv->refcount);
 191         m->context[0] = cm_id_priv;
 192         *msg = m;
 193         return 0;
 194 }
 195
 196 static int cm_alloc_response_msg(struct cm_port *port,
 197                                  struct ib_mad_recv_wc *mad_recv_wc,
 198                                  struct ib_mad_send_buf **msg)
 199 {
 200         struct ib_mad_send_buf *m;
 201         struct ib_ah *ah;
 202
 203         ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc,
 204                                   mad_recv_wc->recv_buf.grh, port->port_num);
 205         if (IS_ERR(ah))
 206                 return PTR_ERR(ah);
 207
 208         m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index,
 209                                0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
 210                                GFP_ATOMIC);
 211         if (IS_ERR(m)) {
 212                 ib_destroy_ah(ah);
 213                 return PTR_ERR(m);
 214         }
 215         m->ah = ah;
 216         *msg = m;
 217         return 0;
 218 }
 219
 220 static void cm_free_msg(struct ib_mad_send_buf *msg)
 221 {
 222         ib_destroy_ah(msg->ah);
 223         if (msg->context[0])
 224                 cm_deref_id(msg->context[0]);
 225         ib_free_send_mad(msg);
 226 }
 227
 228 static void * cm_copy_private_data(const void *private_data,
 229                                    u8 private_data_len)
 230 {
 231         void *data;
 232
 233         if (!private_data || !private_data_len)
 234                 return NULL;
 235
 236         data = kmalloc(private_data_len, GFP_KERNEL);
 237         if (!data)
 238                 return ERR_PTR(-ENOMEM);
 239
 240         memcpy(data, private_data, private_data_len);
 241         return data;
 242 }
 243
 244 static void cm_set_private_data(struct cm_id_private *cm_id_priv,
 245                                  void *private_data, u8 private_data_len)
 246 {
 247         if (cm_id_priv->private_data && cm_id_priv->private_data_len)
 248                 kfree(cm_id_priv->private_data);
 249
 250         cm_id_priv->private_data = private_data;
 251         cm_id_priv->private_data_len = private_data_len;
 252 }
 253
 254 static void cm_set_ah_attr(struct ib_ah_attr *ah_attr, u8 port_num,
 255                            u16 dlid, u8 sl, u16 src_path_bits)
 256 {
 257         memset(ah_attr, 0, sizeof ah_attr);
 258         ah_attr->dlid = dlid;
 259         ah_attr->sl = sl;
 260         ah_attr->src_path_bits = src_path_bits;
 261         ah_attr->port_num = port_num;
 262 }
 263
 264 static void cm_init_av_for_response(struct cm_port *port,
 265                                     struct ib_wc *wc, struct cm_av *av)
 266 {
 267         av->port = port;
 268         av->pkey_index = wc->pkey_index;
 269         cm_set_ah_attr(&av->ah_attr, port->port_num, wc->slid,
 270                        wc->sl, wc->dlid_path_bits);
 271 }
 272
 273 static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av)
 274 {
 275         struct cm_device *cm_dev;
 276         struct cm_port *port = NULL;
 277         unsigned long flags;
 278         int ret;
 279         u8 p;
 280
 281         read_lock_irqsave(&cm.device_lock, flags);
 282         list_for_each_entry(cm_dev, &cm.device_list, list) {
 283                 if (!ib_find_cached_gid(cm_dev->device, &path->sgid,
 284                                         &p, NULL)) {
 285                         port = &cm_dev->port[p-1];
 286                         break;
 287                 }
 288         }
 289         read_unlock_irqrestore(&cm.device_lock, flags);
 290
 291         if (!port)
 292                 return -EINVAL;
 293
 294         ret = ib_find_cached_pkey(cm_dev->device, port->port_num,
 295                                   be16_to_cpu(path->pkey), &av->pkey_index);
 296         if (ret)
 297                 return ret;
 298
 299         av->port = port;
 300         cm_set_ah_attr(&av->ah_attr, av->port->port_num,
 301                        be16_to_cpu(path->dlid), path->sl,
 302                        be16_to_cpu(path->slid) & 0x7F);
 303         av->packet_life_time = path->packet_life_time;
 304         return 0;
 305 }
 306
 307 static int cm_alloc_id(struct cm_id_private *cm_id_priv)
 308 {
 309         unsigned long flags;
 310         int ret;
 311
 312         do {
 313                 spin_lock_irqsave(&cm.lock, flags);
 314                 ret = idr_get_new_above(&cm.local_id_table, cm_id_priv, 1,
 315                                         (__force int *) &cm_id_priv->id.local_id);
 316                 spin_unlock_irqrestore(&cm.lock, flags);
 317         } while( (ret == -EAGAIN) && idr_pre_get(&cm.local_id_table, GFP_KERNEL) );
 318         return ret;
 319 }
 320
 321 static void cm_free_id(__be32 local_id)
 322 {
 323         unsigned long flags;
 324
 325         spin_lock_irqsave(&cm.lock, flags);
 326         idr_remove(&cm.local_id_table, (__force int) local_id);
 327         spin_unlock_irqrestore(&cm.lock, flags);
 328 }
 329
 330 static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id)
 331 {
 332         struct cm_id_private *cm_id_priv;
 333
 334         cm_id_priv = idr_find(&cm.local_id_table, (__force int) local_id);
 335         if (cm_id_priv) {
 336                 if (cm_id_priv->id.remote_id == remote_id)
 337                         atomic_inc(&cm_id_priv->refcount);
 338                 else
 339                         cm_id_priv = NULL;
 340         }
 341
 342         return cm_id_priv;
 343 }
 344
 345 static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id)
 346 {
 347         struct cm_id_private *cm_id_priv;
 348         unsigned long flags;
 349
 350         spin_lock_irqsave(&cm.lock, flags);
 351         cm_id_priv = cm_get_id(local_id, remote_id);
 352         spin_unlock_irqrestore(&cm.lock, flags);
 353
 354         return cm_id_priv;
 355 }
 356
 357 static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv)
 358 {
 359         struct rb_node **link = &cm.listen_service_table.rb_node;
 360         struct rb_node *parent = NULL;
 361         struct cm_id_private *cur_cm_id_priv;
 362         __be64 service_id = cm_id_priv->id.service_id;
 363         __be64 service_mask = cm_id_priv->id.service_mask;
 364
 365         while (*link) {
 366                 parent = *link;
 367                 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
 368                                           service_node);
 369                 if ((cur_cm_id_priv->id.service_mask & service_id) ==
 370                     (service_mask & cur_cm_id_priv->id.service_id) &&
 371                     (cm_id_priv->id.device == cur_cm_id_priv->id.device))
 372                         return cur_cm_id_priv;
 373
 374                 if (cm_id_priv->id.device < cur_cm_id_priv->id.device)
 375                         link = &(*link)->rb_left;
 376                 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device)
 377                         link = &(*link)->rb_right;
 378                 else if (service_id < cur_cm_id_priv->id.service_id)
 379                         link = &(*link)->rb_left;
 380                 else
 381                         link = &(*link)->rb_right;
 382         }
 383         rb_link_node(&cm_id_priv->service_node, parent, link);
 384         rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table);
 385         return NULL;
 386 }
 387
 388 static struct cm_id_private * cm_find_listen(struct ib_device *device,
 389                                              __be64 service_id)
 390 {
 391         struct rb_node *node = cm.listen_service_table.rb_node;
 392         struct cm_id_private *cm_id_priv;
 393
 394         while (node) {
 395                 cm_id_priv = rb_entry(node, struct cm_id_private, service_node);
 396                 if ((cm_id_priv->id.service_mask & service_id) ==
 397                      cm_id_priv->id.service_id &&
 398                     (cm_id_priv->id.device == device))
 399                         return cm_id_priv;
 400
 401                 if (device < cm_id_priv->id.device)
 402                         node = node->rb_left;
 403                 else if (device > cm_id_priv->id.device)
 404                         node = node->rb_right;
 405                 else if (service_id < cm_id_priv->id.service_id)
 406                         node = node->rb_left;
 407                 else
 408                         node = node->rb_right;
 409         }
 410         return NULL;
 411 }
 412
 413 static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info
 414                                                      *timewait_info)
 415 {
 416         struct rb_node **link = &cm.remote_id_table.rb_node;
 417         struct rb_node *parent = NULL;
 418         struct cm_timewait_info *cur_timewait_info;
 419         __be64 remote_ca_guid = timewait_info->remote_ca_guid;
 420         __be32 remote_id = timewait_info->work.remote_id;
 421
 422         while (*link) {
 423                 parent = *link;
 424                 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
 425                                              remote_id_node);
 426                 if (remote_id < cur_timewait_info->work.remote_id)
 427                         link = &(*link)->rb_left;
 428                 else if (remote_id > cur_timewait_info->work.remote_id)
 429                         link = &(*link)->rb_right;
 430                 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid)
 431                         link = &(*link)->rb_left;
 432                 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid)
 433                         link = &(*link)->rb_right;
 434                 else
 435                         return cur_timewait_info;
 436         }
 437         timewait_info->inserted_remote_id = 1;
 438         rb_link_node(&timewait_info->remote_id_node, parent, link);
 439         rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table);
 440         return NULL;
 441 }
 442
 443 static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid,
 444                                                    __be32 remote_id)
 445 {
 446         struct rb_node *node = cm.remote_id_table.rb_node;
 447         struct cm_timewait_info *timewait_info;
 448
 449         while (node) {
 450                 timewait_info = rb_entry(node, struct cm_timewait_info,
 451                                          remote_id_node);
 452                 if (remote_id < timewait_info->work.remote_id)
 453                         node = node->rb_left;
 454                 else if (remote_id > timewait_info->work.remote_id)
 455                         node = node->rb_right;
 456                 else if (remote_ca_guid < timewait_info->remote_ca_guid)
 457                         node = node->rb_left;
 458                 else if (remote_ca_guid > timewait_info->remote_ca_guid)
 459                         node = node->rb_right;
 460                 else
 461                         return timewait_info;
 462         }
 463         return NULL;
 464 }
 465
 466 static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info
 467                                                       *timewait_info)
 468 {
 469         struct rb_node **link = &cm.remote_qp_table.rb_node;
 470         struct rb_node *parent = NULL;
 471         struct cm_timewait_info *cur_timewait_info;
 472         __be64 remote_ca_guid = timewait_info->remote_ca_guid;
 473         __be32 remote_qpn = timewait_info->remote_qpn;
 474
 475         while (*link) {
 476                 parent = *link;
 477                 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
 478                                              remote_qp_node);
 479                 if (remote_qpn < cur_timewait_info->remote_qpn)
 480                         link = &(*link)->rb_left;
 481                 else if (remote_qpn > cur_timewait_info->remote_qpn)
 482                         link = &(*link)->rb_right;
 483                 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid)
 484                         link = &(*link)->rb_left;
 485                 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid)
 486                         link = &(*link)->rb_right;
 487                 else
 488                         return cur_timewait_info;
 489         }
 490         timewait_info->inserted_remote_qp = 1;
 491         rb_link_node(&timewait_info->remote_qp_node, parent, link);
 492         rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table);
 493         return NULL;
 494 }
 495
 496 static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private
 497                                                     *cm_id_priv)
 498 {
 499         struct rb_node **link = &cm.remote_sidr_table.rb_node;
 500         struct rb_node *parent = NULL;
 501         struct cm_id_private *cur_cm_id_priv;
 502         union ib_gid *port_gid = &cm_id_priv->av.dgid;
 503         __be32 remote_id = cm_id_priv->id.remote_id;
 504
 505         while (*link) {
 506                 parent = *link;
 507                 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
 508                                           sidr_id_node);
 509                 if (remote_id < cur_cm_id_priv->id.remote_id)
 510                         link = &(*link)->rb_left;
 511                 else if (remote_id > cur_cm_id_priv->id.remote_id)
 512                         link = &(*link)->rb_right;
 513                 else {
 514                         int cmp;
 515                         cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid,
 516                                      sizeof *port_gid);
 517                         if (cmp < 0)
 518                                 link = &(*link)->rb_left;
 519                         else if (cmp > 0)
 520                                 link = &(*link)->rb_right;
 521                         else
 522                                 return cur_cm_id_priv;
 523                 }
 524         }
 525         rb_link_node(&cm_id_priv->sidr_id_node, parent, link);
 526         rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
 527         return NULL;
 528 }
 529
 530 static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv,
 531                                enum ib_cm_sidr_status status)
 532 {
 533         struct ib_cm_sidr_rep_param param;
 534
 535         memset(&param, 0, sizeof param);
 536         param.status = status;
 537         ib_send_cm_sidr_rep(&cm_id_priv->id, &param);
 538 }
 539
 540 struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
 541                                  ib_cm_handler cm_handler,
 542                                  void *context)
 543 {
 544         struct cm_id_private *cm_id_priv;
 545         int ret;
 546
 547         cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL);
 548         if (!cm_id_priv)
 549                 return ERR_PTR(-ENOMEM);
 550
 551         cm_id_priv->id.state = IB_CM_IDLE;
 552         cm_id_priv->id.device = device;
 553         cm_id_priv->id.cm_handler = cm_handler;
 554         cm_id_priv->id.context = context;
 555         cm_id_priv->id.remote_cm_qpn = 1;
 556         ret = cm_alloc_id(cm_id_priv);
 557         if (ret)
 558                 goto error;
 559
 560         spin_lock_init(&cm_id_priv->lock);
 561         init_waitqueue_head(&cm_id_priv->wait);
 562         INIT_LIST_HEAD(&cm_id_priv->work_list);
 563         atomic_set(&cm_id_priv->work_count, -1);
 564         atomic_set(&cm_id_priv->refcount, 1);
 565         return &cm_id_priv->id;
 566
 567 error:
 568         kfree(cm_id_priv);
 569         return ERR_PTR(-ENOMEM);
 570 }
 571 EXPORT_SYMBOL(ib_create_cm_id);
 572
 573 static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv)
 574 {
 575         struct cm_work *work;
 576
 577         if (list_empty(&cm_id_priv->work_list))
 578                 return NULL;
 579
 580         work = list_entry(cm_id_priv->work_list.next, struct cm_work, list);
 581         list_del(&work->list);
 582         return work;
 583 }
 584
 585 static void cm_free_work(struct cm_work *work)
 586 {
 587         if (work->mad_recv_wc)
 588                 ib_free_recv_mad(work->mad_recv_wc);
 589         kfree(work);
 590 }
 591
 592 static inline int cm_convert_to_ms(int iba_time)
 593 {
 594         /* approximate conversion to ms from 4.096us x 2^iba_time */
 595         return 1 << max(iba_time - 8, 0);
 596 }
 597
 598 static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info)
 599 {
 600         unsigned long flags;
 601
 602         if (!timewait_info->inserted_remote_id &&
 603             !timewait_info->inserted_remote_qp)
 604             return;
 605
 606         spin_lock_irqsave(&cm.lock, flags);
 607         if (timewait_info->inserted_remote_id) {
 608                 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table);
 609                 timewait_info->inserted_remote_id = 0;
 610         }
 611
 612         if (timewait_info->inserted_remote_qp) {
 613                 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table);
 614                 timewait_info->inserted_remote_qp = 0;
 615         }
 616         spin_unlock_irqrestore(&cm.lock, flags);
 617 }
 618
 619 static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id)
 620 {
 621         struct cm_timewait_info *timewait_info;
 622
 623         timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL);
 624         if (!timewait_info)
 625                 return ERR_PTR(-ENOMEM);
 626
 627         timewait_info->work.local_id = local_id;
 628         INIT_WORK(&timewait_info->work.work, cm_work_handler,
 629                   &timewait_info->work);
 630         timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT;
 631         return timewait_info;
 632 }
 633
 634 static void cm_enter_timewait(struct cm_id_private *cm_id_priv)
 635 {
 636         int wait_time;
 637
 638         /*
 639          * The cm_id could be destroyed by the user before we exit timewait.
 640          * To protect against this, we search for the cm_id after exiting
 641          * timewait before notifying the user that we've exited timewait.
 642          */
 643         cm_id_priv->id.state = IB_CM_TIMEWAIT;
 644         wait_time = cm_convert_to_ms(cm_id_priv->local_ack_timeout);
 645         queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work,
 646                            msecs_to_jiffies(wait_time));
 647         cm_id_priv->timewait_info = NULL;
 648 }
 649
 650 static void cm_reset_to_idle(struct cm_id_private *cm_id_priv)
 651 {
 652         cm_id_priv->id.state = IB_CM_IDLE;
 653         if (cm_id_priv->timewait_info) {
 654                 cm_cleanup_timewait(cm_id_priv->timewait_info);
 655                 kfree(cm_id_priv->timewait_info);
 656                 cm_id_priv->timewait_info = NULL;
 657         }
 658 }
 659
 660 void ib_destroy_cm_id(struct ib_cm_id *cm_id)
 661 {
 662         struct cm_id_private *cm_id_priv;
 663         struct cm_work *work;
 664         unsigned long flags;
 665
 666         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
 667 retest:
 668         spin_lock_irqsave(&cm_id_priv->lock, flags);
 669         switch (cm_id->state) {
 670         case IB_CM_LISTEN:
 671                 cm_id->state = IB_CM_IDLE;
 672                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 673                 spin_lock_irqsave(&cm.lock, flags);
 674                 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table);
 675                 spin_unlock_irqrestore(&cm.lock, flags);
 676                 break;
 677         case IB_CM_SIDR_REQ_SENT:
 678                 cm_id->state = IB_CM_IDLE;
 679                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
 680                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 681                 break;
 682         case IB_CM_SIDR_REQ_RCVD:
 683                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 684                 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT);
 685                 break;
 686         case IB_CM_REQ_SENT:
 687         case IB_CM_MRA_REQ_RCVD:
 688         case IB_CM_REP_SENT:
 689         case IB_CM_MRA_REP_RCVD:
 690                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
 691                 /* Fall through */
 692         case IB_CM_REQ_RCVD:
 693         case IB_CM_MRA_REQ_SENT:
 694         case IB_CM_REP_RCVD:
 695         case IB_CM_MRA_REP_SENT:
 696                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 697                 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT,
 698                                &cm_id_priv->av.port->cm_dev->ca_guid,
 699                                sizeof cm_id_priv->av.port->cm_dev->ca_guid,
 700                                NULL, 0);
 701                 break;
 702         case IB_CM_ESTABLISHED:
 703                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 704                 ib_send_cm_dreq(cm_id, NULL, 0);
 705                 goto retest;
 706         case IB_CM_DREQ_SENT:
 707                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
 708                 cm_enter_timewait(cm_id_priv);
 709                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 710                 break;
 711         case IB_CM_DREQ_RCVD:
 712                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 713                 ib_send_cm_drep(cm_id, NULL, 0);
 714                 break;
 715         default:
 716                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 717                 break;
 718         }
 719
 720         cm_free_id(cm_id->local_id);
 721         atomic_dec(&cm_id_priv->refcount);
 722         wait_event(cm_id_priv->wait, !atomic_read(&cm_id_priv->refcount));
 723         while ((work = cm_dequeue_work(cm_id_priv)) != NULL)
 724                 cm_free_work(work);
 725         if (cm_id_priv->private_data && cm_id_priv->private_data_len)
 726                 kfree(cm_id_priv->private_data);
 727         kfree(cm_id_priv);
 728 }
 729 EXPORT_SYMBOL(ib_destroy_cm_id);
 730
 731 int ib_cm_listen(struct ib_cm_id *cm_id,
 732                  __be64 service_id,
 733                  __be64 service_mask)
 734 {
 735         struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
 736         unsigned long flags;
 737         int ret = 0;
 738
 739         service_mask = service_mask ? service_mask :
 740                        __constant_cpu_to_be64(~0ULL);
 741         service_id &= service_mask;
 742         if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID &&
 743             (service_id != IB_CM_ASSIGN_SERVICE_ID))
 744                 return -EINVAL;
 745
 746         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
 747         BUG_ON(cm_id->state != IB_CM_IDLE);
 748
 749         cm_id->state = IB_CM_LISTEN;
 750
 751         spin_lock_irqsave(&cm.lock, flags);
 752         if (service_id == IB_CM_ASSIGN_SERVICE_ID) {
 753                 cm_id->service_id = cpu_to_be64(cm.listen_service_id++);
 754                 cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
 755         } else {
 756                 cm_id->service_id = service_id;
 757                 cm_id->service_mask = service_mask;
 758         }
 759         cur_cm_id_priv = cm_insert_listen(cm_id_priv);
 760         spin_unlock_irqrestore(&cm.lock, flags);
 761
 762         if (cur_cm_id_priv) {
 763                 cm_id->state = IB_CM_IDLE;
 764                 ret = -EBUSY;
 765         }
 766         return ret;
 767 }
 768 EXPORT_SYMBOL(ib_cm_listen);
 769
 770 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv,
 771                           enum cm_msg_sequence msg_seq)
 772 {
 773         u64 hi_tid, low_tid;
 774
 775         hi_tid   = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32;
 776         low_tid  = (u64) ((__force u32)cm_id_priv->id.local_id |
 777                           (msg_seq << 30));
 778         return cpu_to_be64(hi_tid | low_tid);
 779 }
 780
 781 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr,
 782                               __be16 attr_id, __be64 tid)
 783 {
 784         hdr->base_version  = IB_MGMT_BASE_VERSION;
 785         hdr->mgmt_class    = IB_MGMT_CLASS_CM;
 786         hdr->class_version = IB_CM_CLASS_VERSION;
 787         hdr->method        = IB_MGMT_METHOD_SEND;
 788         hdr->attr_id       = attr_id;
 789         hdr->tid           = tid;
 790 }
 791
 792 static void cm_format_req(struct cm_req_msg *req_msg,
 793                           struct cm_id_private *cm_id_priv,
 794                           struct ib_cm_req_param *param)
 795 {
 796         cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID,
 797                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ));
 798
 799         req_msg->local_comm_id = cm_id_priv->id.local_id;
 800         req_msg->service_id = param->service_id;
 801         req_msg->local_ca_guid = cm_id_priv->av.port->cm_dev->ca_guid;
 802         cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num));
 803         cm_req_set_resp_res(req_msg, param->responder_resources);
 804         cm_req_set_init_depth(req_msg, param->initiator_depth);
 805         cm_req_set_remote_resp_timeout(req_msg,
 806                                        param->remote_cm_response_timeout);
 807         cm_req_set_qp_type(req_msg, param->qp_type);
 808         cm_req_set_flow_ctrl(req_msg, param->flow_control);
 809         cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn));
 810         cm_req_set_local_resp_timeout(req_msg,
 811                                       param->local_cm_response_timeout);
 812         cm_req_set_retry_count(req_msg, param->retry_count);
 813         req_msg->pkey = param->primary_path->pkey;
 814         cm_req_set_path_mtu(req_msg, param->primary_path->mtu);
 815         cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count);
 816         cm_req_set_max_cm_retries(req_msg, param->max_cm_retries);
 817         cm_req_set_srq(req_msg, param->srq);
 818
 819         req_msg->primary_local_lid = param->primary_path->slid;
 820         req_msg->primary_remote_lid = param->primary_path->dlid;
 821         req_msg->primary_local_gid = param->primary_path->sgid;
 822         req_msg->primary_remote_gid = param->primary_path->dgid;
 823         cm_req_set_primary_flow_label(req_msg, param->primary_path->flow_label);
 824         cm_req_set_primary_packet_rate(req_msg, param->primary_path->rate);
 825         req_msg->primary_traffic_class = param->primary_path->traffic_class;
 826         req_msg->primary_hop_limit = param->primary_path->hop_limit;
 827         cm_req_set_primary_sl(req_msg, param->primary_path->sl);
 828         cm_req_set_primary_subnet_local(req_msg, 1); /* local only... */
 829         cm_req_set_primary_local_ack_timeout(req_msg,
 830                 min(31, param->primary_path->packet_life_time + 1));
 831
 832         if (param->alternate_path) {
 833                 req_msg->alt_local_lid = param->alternate_path->slid;
 834                 req_msg->alt_remote_lid = param->alternate_path->dlid;
 835                 req_msg->alt_local_gid = param->alternate_path->sgid;
 836                 req_msg->alt_remote_gid = param->alternate_path->dgid;
 837                 cm_req_set_alt_flow_label(req_msg,
 838                                           param->alternate_path->flow_label);
 839                 cm_req_set_alt_packet_rate(req_msg, param->alternate_path->rate);
 840                 req_msg->alt_traffic_class = param->alternate_path->traffic_class;
 841                 req_msg->alt_hop_limit = param->alternate_path->hop_limit;
 842                 cm_req_set_alt_sl(req_msg, param->alternate_path->sl);
 843                 cm_req_set_alt_subnet_local(req_msg, 1); /* local only... */
 844                 cm_req_set_alt_local_ack_timeout(req_msg,
 845                         min(31, param->alternate_path->packet_life_time + 1));
 846         }
 847
 848         if (param->private_data && param->private_data_len)
 849                 memcpy(req_msg->private_data, param->private_data,
 850                        param->private_data_len);
 851 }
 852
 853 static inline int cm_validate_req_param(struct ib_cm_req_param *param)
 854 {
 855         /* peer-to-peer not supported */
 856         if (param->peer_to_peer)
 857                 return -EINVAL;
 858
 859         if (!param->primary_path)
 860                 return -EINVAL;
 861
 862         if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC)
 863                 return -EINVAL;
 864
 865         if (param->private_data &&
 866             param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE)
 867                 return -EINVAL;
 868
 869         if (param->alternate_path &&
 870             (param->alternate_path->pkey != param->primary_path->pkey ||
 871              param->alternate_path->mtu != param->primary_path->mtu))
 872                 return -EINVAL;
 873
 874         return 0;
 875 }
 876
 877 int ib_send_cm_req(struct ib_cm_id *cm_id,
 878                    struct ib_cm_req_param *param)
 879 {
 880         struct cm_id_private *cm_id_priv;
 881         struct cm_req_msg *req_msg;
 882         unsigned long flags;
 883         int ret;
 884
 885         ret = cm_validate_req_param(param);
 886         if (ret)
 887                 return ret;
 888
 889         /* Verify that we're not in timewait. */
 890         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
 891         spin_lock_irqsave(&cm_id_priv->lock, flags);
 892         if (cm_id->state != IB_CM_IDLE) {
 893                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 894                 ret = -EINVAL;
 895                 goto out;
 896         }
 897         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 898
 899         cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
 900                                                             id.local_id);
 901         if (IS_ERR(cm_id_priv->timewait_info))
 902                 goto out;
 903
 904         ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av);
 905         if (ret)
 906                 goto error1;
 907         if (param->alternate_path) {
 908                 ret = cm_init_av_by_path(param->alternate_path,
 909                                          &cm_id_priv->alt_av);
 910                 if (ret)
 911                         goto error1;
 912         }
 913         cm_id->service_id = param->service_id;
 914         cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
 915         cm_id_priv->timeout_ms = cm_convert_to_ms(
 916                                     param->primary_path->packet_life_time) * 2 +
 917                                  cm_convert_to_ms(
 918                                     param->remote_cm_response_timeout);
 919         cm_id_priv->max_cm_retries = param->max_cm_retries;
 920         cm_id_priv->initiator_depth = param->initiator_depth;
 921         cm_id_priv->responder_resources = param->responder_resources;
 922         cm_id_priv->retry_count = param->retry_count;
 923         cm_id_priv->path_mtu = param->primary_path->mtu;
 924         cm_id_priv->qp_type = param->qp_type;
 925
 926         ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg);
 927         if (ret)
 928                 goto error1;
 929
 930         req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad;
 931         cm_format_req(req_msg, cm_id_priv, param);
 932         cm_id_priv->tid = req_msg->hdr.tid;
 933         cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms;
 934         cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT;
 935
 936         cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg);
 937         cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg);
 938         cm_id_priv->local_ack_timeout =
 939                                 cm_req_get_primary_local_ack_timeout(req_msg);
 940
 941         spin_lock_irqsave(&cm_id_priv->lock, flags);
 942         ret = ib_post_send_mad(cm_id_priv->msg, NULL);
 943         if (ret) {
 944                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 945                 goto error2;
 946         }
 947         BUG_ON(cm_id->state != IB_CM_IDLE);
 948         cm_id->state = IB_CM_REQ_SENT;
 949         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 950         return 0;
 951
 952 error2: cm_free_msg(cm_id_priv->msg);
 953 error1: kfree(cm_id_priv->timewait_info);
 954 out:    return ret;
 955 }
 956 EXPORT_SYMBOL(ib_send_cm_req);
 957
 958 static int cm_issue_rej(struct cm_port *port,
 959                         struct ib_mad_recv_wc *mad_recv_wc,
 960                         enum ib_cm_rej_reason reason,
 961                         enum cm_msg_response msg_rejected,
 962                         void *ari, u8 ari_length)
 963 {
 964         struct ib_mad_send_buf *msg = NULL;
 965         struct cm_rej_msg *rej_msg, *rcv_msg;
 966         int ret;
 967
 968         ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
 969         if (ret)
 970                 return ret;
 971
 972         /* We just need common CM header information.  Cast to any message. */
 973         rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad;
 974         rej_msg = (struct cm_rej_msg *) msg->mad;
 975
 976         cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid);
 977         rej_msg->remote_comm_id = rcv_msg->local_comm_id;
 978         rej_msg->local_comm_id = rcv_msg->remote_comm_id;
 979         cm_rej_set_msg_rejected(rej_msg, msg_rejected);
 980         rej_msg->reason = cpu_to_be16(reason);
 981
 982         if (ari && ari_length) {
 983                 cm_rej_set_reject_info_len(rej_msg, ari_length);
 984                 memcpy(rej_msg->ari, ari, ari_length);
 985         }
 986
 987         ret = ib_post_send_mad(msg, NULL);
 988         if (ret)
 989                 cm_free_msg(msg);
 990
 991         return ret;
 992 }
 993
 994 static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid,
 995                                     __be32 local_qpn, __be32 remote_qpn)
 996 {
 997         return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) ||
 998                 ((local_ca_guid == remote_ca_guid) &&
 999                  (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn))));
1000 }
1001
1002 static inline void cm_format_paths_from_req(struct cm_req_msg *req_msg,
1003                                             struct ib_sa_path_rec *primary_path,
1004                                             struct ib_sa_path_rec *alt_path)
1005 {
1006         memset(primary_path, 0, sizeof *primary_path);
1007         primary_path->dgid = req_msg->primary_local_gid;
1008         primary_path->sgid = req_msg->primary_remote_gid;
1009         primary_path->dlid = req_msg->primary_local_lid;
1010         primary_path->slid = req_msg->primary_remote_lid;
1011         primary_path->flow_label = cm_req_get_primary_flow_label(req_msg);
1012         primary_path->hop_limit = req_msg->primary_hop_limit;
1013         primary_path->traffic_class = req_msg->primary_traffic_class;
1014         primary_path->reversible = 1;
1015         primary_path->pkey = req_msg->pkey;
1016         primary_path->sl = cm_req_get_primary_sl(req_msg);
1017         primary_path->mtu_selector = IB_SA_EQ;
1018         primary_path->mtu = cm_req_get_path_mtu(req_msg);
1019         primary_path->rate_selector = IB_SA_EQ;
1020         primary_path->rate = cm_req_get_primary_packet_rate(req_msg);
1021         primary_path->packet_life_time_selector = IB_SA_EQ;
1022         primary_path->packet_life_time =
1023                 cm_req_get_primary_local_ack_timeout(req_msg);
1024         primary_path->packet_life_time -= (primary_path->packet_life_time > 0);
1025
1026         if (req_msg->alt_local_lid) {
1027                 memset(alt_path, 0, sizeof *alt_path);
1028                 alt_path->dgid = req_msg->alt_local_gid;
1029                 alt_path->sgid = req_msg->alt_remote_gid;
1030                 alt_path->dlid = req_msg->alt_local_lid;
1031                 alt_path->slid = req_msg->alt_remote_lid;
1032                 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg);
1033                 alt_path->hop_limit = req_msg->alt_hop_limit;
1034                 alt_path->traffic_class = req_msg->alt_traffic_class;
1035                 alt_path->reversible = 1;
1036                 alt_path->pkey = req_msg->pkey;
1037                 alt_path->sl = cm_req_get_alt_sl(req_msg);
1038                 alt_path->mtu_selector = IB_SA_EQ;
1039                 alt_path->mtu = cm_req_get_path_mtu(req_msg);
1040                 alt_path->rate_selector = IB_SA_EQ;
1041                 alt_path->rate = cm_req_get_alt_packet_rate(req_msg);
1042                 alt_path->packet_life_time_selector = IB_SA_EQ;
1043                 alt_path->packet_life_time =
1044                         cm_req_get_alt_local_ack_timeout(req_msg);
1045                 alt_path->packet_life_time -= (alt_path->packet_life_time > 0);
1046         }
1047 }
1048
1049 static void cm_format_req_event(struct cm_work *work,
1050                                 struct cm_id_private *cm_id_priv,
1051                                 struct ib_cm_id *listen_id)
1052 {
1053         struct cm_req_msg *req_msg;
1054         struct ib_cm_req_event_param *param;
1055
1056         req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1057         param = &work->cm_event.param.req_rcvd;
1058         param->listen_id = listen_id;
1059         param->port = cm_id_priv->av.port->port_num;
1060         param->primary_path = &work->path[0];
1061         if (req_msg->alt_local_lid)
1062                 param->alternate_path = &work->path[1];
1063         else
1064                 param->alternate_path = NULL;
1065         param->remote_ca_guid = req_msg->local_ca_guid;
1066         param->remote_qkey = be32_to_cpu(req_msg->local_qkey);
1067         param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg));
1068         param->qp_type = cm_req_get_qp_type(req_msg);
1069         param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg));
1070         param->responder_resources = cm_req_get_init_depth(req_msg);
1071         param->initiator_depth = cm_req_get_resp_res(req_msg);
1072         param->local_cm_response_timeout =
1073                                         cm_req_get_remote_resp_timeout(req_msg);
1074         param->flow_control = cm_req_get_flow_ctrl(req_msg);
1075         param->remote_cm_response_timeout =
1076                                         cm_req_get_local_resp_timeout(req_msg);
1077         param->retry_count = cm_req_get_retry_count(req_msg);
1078         param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1079         param->srq = cm_req_get_srq(req_msg);
1080         work->cm_event.private_data = &req_msg->private_data;
1081 }
1082
1083 static void cm_process_work(struct cm_id_private *cm_id_priv,
1084                             struct cm_work *work)
1085 {
1086         unsigned long flags;
1087         int ret;
1088
1089         /* We will typically only have the current event to report. */
1090         ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
1091         cm_free_work(work);
1092
1093         while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) {
1094                 spin_lock_irqsave(&cm_id_priv->lock, flags);
1095                 work = cm_dequeue_work(cm_id_priv);
1096                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1097                 BUG_ON(!work);
1098                 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id,
1099                                                 &work->cm_event);
1100                 cm_free_work(work);
1101         }
1102         cm_deref_id(cm_id_priv);
1103         if (ret)
1104                 ib_destroy_cm_id(&cm_id_priv->id);
1105 }
1106
1107 static void cm_format_mra(struct cm_mra_msg *mra_msg,
1108                           struct cm_id_private *cm_id_priv,
1109                           enum cm_msg_response msg_mraed, u8 service_timeout,
1110                           const void *private_data, u8 private_data_len)
1111 {
1112         cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid);
1113         cm_mra_set_msg_mraed(mra_msg, msg_mraed);
1114         mra_msg->local_comm_id = cm_id_priv->id.local_id;
1115         mra_msg->remote_comm_id = cm_id_priv->id.remote_id;
1116         cm_mra_set_service_timeout(mra_msg, service_timeout);
1117
1118         if (private_data && private_data_len)
1119                 memcpy(mra_msg->private_data, private_data, private_data_len);
1120 }
1121
1122 static void cm_format_rej(struct cm_rej_msg *rej_msg,
1123                           struct cm_id_private *cm_id_priv,
1124                           enum ib_cm_rej_reason reason,
1125                           void *ari,
1126                           u8 ari_length,
1127                           const void *private_data,
1128                           u8 private_data_len)
1129 {
1130         cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid);
1131         rej_msg->remote_comm_id = cm_id_priv->id.remote_id;
1132
1133         switch(cm_id_priv->id.state) {
1134         case IB_CM_REQ_RCVD:
1135                 rej_msg->local_comm_id = 0;
1136                 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1137                 break;
1138         case IB_CM_MRA_REQ_SENT:
1139                 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1140                 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1141                 break;
1142         case IB_CM_REP_RCVD:
1143         case IB_CM_MRA_REP_SENT:
1144                 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1145                 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP);
1146                 break;
1147         default:
1148                 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1149                 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER);
1150                 break;
1151         }
1152
1153         rej_msg->reason = cpu_to_be16(reason);
1154         if (ari && ari_length) {
1155                 cm_rej_set_reject_info_len(rej_msg, ari_length);
1156                 memcpy(rej_msg->ari, ari, ari_length);
1157         }
1158
1159         if (private_data && private_data_len)
1160                 memcpy(rej_msg->private_data, private_data, private_data_len);
1161 }
1162
1163 static void cm_dup_req_handler(struct cm_work *work,
1164                                struct cm_id_private *cm_id_priv)
1165 {
1166         struct ib_mad_send_buf *msg = NULL;
1167         unsigned long flags;
1168         int ret;
1169
1170         /* Quick state check to discard duplicate REQs. */
1171         if (cm_id_priv->id.state == IB_CM_REQ_RCVD)
1172                 return;
1173
1174         ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1175         if (ret)
1176                 return;
1177
1178         spin_lock_irqsave(&cm_id_priv->lock, flags);
1179         switch (cm_id_priv->id.state) {
1180         case IB_CM_MRA_REQ_SENT:
1181                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1182                               CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout,
1183                               cm_id_priv->private_data,
1184                               cm_id_priv->private_data_len);
1185                 break;
1186         case IB_CM_TIMEWAIT:
1187                 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv,
1188                               IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0);
1189                 break;
1190         default:
1191                 goto unlock;
1192         }
1193         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1194
1195         ret = ib_post_send_mad(msg, NULL);
1196         if (ret)
1197                 goto free;
1198         return;
1199
1200 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1201 free:   cm_free_msg(msg);
1202 }
1203
1204 static struct cm_id_private * cm_match_req(struct cm_work *work,
1205                                            struct cm_id_private *cm_id_priv)
1206 {
1207         struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv;
1208         struct cm_timewait_info *timewait_info;
1209         struct cm_req_msg *req_msg;
1210         unsigned long flags;
1211
1212         req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1213
1214         /* Check for duplicate REQ and stale connections. */
1215         spin_lock_irqsave(&cm.lock, flags);
1216         timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info);
1217         if (!timewait_info)
1218                 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
1219
1220         if (timewait_info) {
1221                 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
1222                                            timewait_info->work.remote_id);
1223                 spin_unlock_irqrestore(&cm.lock, flags);
1224                 if (cur_cm_id_priv) {
1225                         cm_dup_req_handler(work, cur_cm_id_priv);
1226                         cm_deref_id(cur_cm_id_priv);
1227                 } else
1228                         cm_issue_rej(work->port, work->mad_recv_wc,
1229                                      IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
1230                                      NULL, 0);
1231                 goto error;
1232         }
1233
1234         /* Find matching listen request. */
1235         listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device,
1236                                            req_msg->service_id);
1237         if (!listen_cm_id_priv) {
1238                 spin_unlock_irqrestore(&cm.lock, flags);
1239                 cm_issue_rej(work->port, work->mad_recv_wc,
1240                              IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ,
1241                              NULL, 0);
1242                 goto error;
1243         }
1244         atomic_inc(&listen_cm_id_priv->refcount);
1245         atomic_inc(&cm_id_priv->refcount);
1246         cm_id_priv->id.state = IB_CM_REQ_RCVD;
1247         atomic_inc(&cm_id_priv->work_count);
1248         spin_unlock_irqrestore(&cm.lock, flags);
1249         return listen_cm_id_priv;
1250
1251 error:  cm_cleanup_timewait(cm_id_priv->timewait_info);
1252         return NULL;
1253 }
1254
1255 static int cm_req_handler(struct cm_work *work)
1256 {
1257         struct ib_cm_id *cm_id;
1258         struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
1259         struct cm_req_msg *req_msg;
1260         int ret;
1261
1262         req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1263
1264         cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL);
1265         if (IS_ERR(cm_id))
1266                 return PTR_ERR(cm_id);
1267
1268         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1269         cm_id_priv->id.remote_id = req_msg->local_comm_id;
1270         cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
1271                                 &cm_id_priv->av);
1272         cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1273                                                             id.local_id);
1274         if (IS_ERR(cm_id_priv->timewait_info)) {
1275                 ret = PTR_ERR(cm_id_priv->timewait_info);
1276                 goto error1;
1277         }
1278         cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id;
1279         cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid;
1280         cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg);
1281
1282         listen_cm_id_priv = cm_match_req(work, cm_id_priv);
1283         if (!listen_cm_id_priv) {
1284                 ret = -EINVAL;
1285                 goto error2;
1286         }
1287
1288         cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
1289         cm_id_priv->id.context = listen_cm_id_priv->id.context;
1290         cm_id_priv->id.service_id = req_msg->service_id;
1291         cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL);
1292
1293         cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]);
1294         ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av);
1295         if (ret)
1296                 goto error3;
1297         if (req_msg->alt_local_lid) {
1298                 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av);
1299                 if (ret)
1300                         goto error3;
1301         }
1302         cm_id_priv->tid = req_msg->hdr.tid;
1303         cm_id_priv->timeout_ms = cm_convert_to_ms(
1304                                         cm_req_get_local_resp_timeout(req_msg));
1305         cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg);
1306         cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg);
1307         cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg);
1308         cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg);
1309         cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg);
1310         cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg);
1311         cm_id_priv->local_ack_timeout =
1312                                 cm_req_get_primary_local_ack_timeout(req_msg);
1313         cm_id_priv->retry_count = cm_req_get_retry_count(req_msg);
1314         cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1315         cm_id_priv->qp_type = cm_req_get_qp_type(req_msg);
1316
1317         cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
1318         cm_process_work(cm_id_priv, work);
1319         cm_deref_id(listen_cm_id_priv);
1320         return 0;
1321
1322 error3: atomic_dec(&cm_id_priv->refcount);
1323         cm_deref_id(listen_cm_id_priv);
1324         cm_cleanup_timewait(cm_id_priv->timewait_info);
1325 error2: kfree(cm_id_priv->timewait_info);
1326         cm_id_priv->timewait_info = NULL;
1327 error1: ib_destroy_cm_id(&cm_id_priv->id);
1328         return ret;
1329 }
1330
1331 static void cm_format_rep(struct cm_rep_msg *rep_msg,
1332                           struct cm_id_private *cm_id_priv,
1333                           struct ib_cm_rep_param *param)
1334 {
1335         cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid);
1336         rep_msg->local_comm_id = cm_id_priv->id.local_id;
1337         rep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1338         cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num));
1339         cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn));
1340         rep_msg->resp_resources = param->responder_resources;
1341         rep_msg->initiator_depth = param->initiator_depth;
1342         cm_rep_set_target_ack_delay(rep_msg, param->target_ack_delay);
1343         cm_rep_set_failover(rep_msg, param->failover_accepted);
1344         cm_rep_set_flow_ctrl(rep_msg, param->flow_control);
1345         cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count);
1346         cm_rep_set_srq(rep_msg, param->srq);
1347         rep_msg->local_ca_guid = cm_id_priv->av.port->cm_dev->ca_guid;
1348
1349         if (param->private_data && param->private_data_len)
1350                 memcpy(rep_msg->private_data, param->private_data,
1351                        param->private_data_len);
1352 }
1353
1354 int ib_send_cm_rep(struct ib_cm_id *cm_id,
1355                    struct ib_cm_rep_param *param)
1356 {
1357         struct cm_id_private *cm_id_priv;
1358         struct ib_mad_send_buf *msg;
1359         struct cm_rep_msg *rep_msg;
1360         unsigned long flags;
1361         int ret;
1362
1363         if (param->private_data &&
1364             param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE)
1365                 return -EINVAL;
1366
1367         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1368         spin_lock_irqsave(&cm_id_priv->lock, flags);
1369         if (cm_id->state != IB_CM_REQ_RCVD &&
1370             cm_id->state != IB_CM_MRA_REQ_SENT) {
1371                 ret = -EINVAL;
1372                 goto out;
1373         }
1374
1375         ret = cm_alloc_msg(cm_id_priv, &msg);
1376         if (ret)
1377                 goto out;
1378
1379         rep_msg = (struct cm_rep_msg *) msg->mad;
1380         cm_format_rep(rep_msg, cm_id_priv, param);
1381         msg->timeout_ms = cm_id_priv->timeout_ms;
1382         msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;
1383
1384         ret = ib_post_send_mad(msg, NULL);
1385         if (ret) {
1386                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1387                 cm_free_msg(msg);
1388                 return ret;
1389         }
1390
1391         cm_id->state = IB_CM_REP_SENT;
1392         cm_id_priv->msg = msg;
1393         cm_id_priv->initiator_depth = param->initiator_depth;
1394         cm_id_priv->responder_resources = param->responder_resources;
1395         cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg);
1396         cm_id_priv->local_qpn = cm_rep_get_local_qpn(rep_msg);
1397
1398 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1399         return ret;
1400 }
1401 EXPORT_SYMBOL(ib_send_cm_rep);
1402
1403 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg,
1404                           struct cm_id_private *cm_id_priv,
1405                           const void *private_data,
1406                           u8 private_data_len)
1407 {
1408         cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid);
1409         rtu_msg->local_comm_id = cm_id_priv->id.local_id;
1410         rtu_msg->remote_comm_id = cm_id_priv->id.remote_id;
1411
1412         if (private_data && private_data_len)
1413                 memcpy(rtu_msg->private_data, private_data, private_data_len);
1414 }
1415
1416 int ib_send_cm_rtu(struct ib_cm_id *cm_id,
1417                    const void *private_data,
1418                    u8 private_data_len)
1419 {
1420         struct cm_id_private *cm_id_priv;
1421         struct ib_mad_send_buf *msg;
1422         unsigned long flags;
1423         void *data;
1424         int ret;
1425
1426         if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE)
1427                 return -EINVAL;
1428
1429         data = cm_copy_private_data(private_data, private_data_len);
1430         if (IS_ERR(data))
1431                 return PTR_ERR(data);
1432
1433         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1434         spin_lock_irqsave(&cm_id_priv->lock, flags);
1435         if (cm_id->state != IB_CM_REP_RCVD &&
1436             cm_id->state != IB_CM_MRA_REP_SENT) {
1437                 ret = -EINVAL;
1438                 goto error;
1439         }
1440
1441         ret = cm_alloc_msg(cm_id_priv, &msg);
1442         if (ret)
1443                 goto error;
1444
1445         cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1446                       private_data, private_data_len);
1447
1448         ret = ib_post_send_mad(msg, NULL);
1449         if (ret) {
1450                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1451                 cm_free_msg(msg);
1452                 kfree(data);
1453                 return ret;
1454         }
1455
1456         cm_id->state = IB_CM_ESTABLISHED;
1457         cm_set_private_data(cm_id_priv, data, private_data_len);
1458         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1459         return 0;
1460
1461 error:  spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1462         kfree(data);
1463         return ret;
1464 }
1465 EXPORT_SYMBOL(ib_send_cm_rtu);
1466
1467 static void cm_format_rep_event(struct cm_work *work)
1468 {
1469         struct cm_rep_msg *rep_msg;
1470         struct ib_cm_rep_event_param *param;
1471
1472         rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1473         param = &work->cm_event.param.rep_rcvd;
1474         param->remote_ca_guid = rep_msg->local_ca_guid;
1475         param->remote_qkey = be32_to_cpu(rep_msg->local_qkey);
1476         param->remote_qpn = be32_to_cpu(cm_rep_get_local_qpn(rep_msg));
1477         param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg));
1478         param->responder_resources = rep_msg->initiator_depth;
1479         param->initiator_depth = rep_msg->resp_resources;
1480         param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
1481         param->failover_accepted = cm_rep_get_failover(rep_msg);
1482         param->flow_control = cm_rep_get_flow_ctrl(rep_msg);
1483         param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1484         param->srq = cm_rep_get_srq(rep_msg);
1485         work->cm_event.private_data = &rep_msg->private_data;
1486 }
1487
1488 static void cm_dup_rep_handler(struct cm_work *work)
1489 {
1490         struct cm_id_private *cm_id_priv;
1491         struct cm_rep_msg *rep_msg;
1492         struct ib_mad_send_buf *msg = NULL;
1493         unsigned long flags;
1494         int ret;
1495
1496         rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad;
1497         cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id,
1498                                    rep_msg->local_comm_id);
1499         if (!cm_id_priv)
1500                 return;
1501
1502         ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1503         if (ret)
1504                 goto deref;
1505
1506         spin_lock_irqsave(&cm_id_priv->lock, flags);
1507         if (cm_id_priv->id.state == IB_CM_ESTABLISHED)
1508                 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1509                               cm_id_priv->private_data,
1510                               cm_id_priv->private_data_len);
1511         else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT)
1512                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1513                               CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout,
1514                               cm_id_priv->private_data,
1515                               cm_id_priv->private_data_len);
1516         else
1517                 goto unlock;
1518         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1519
1520         ret = ib_post_send_mad(msg, NULL);
1521         if (ret)
1522                 goto free;
1523         goto deref;
1524
1525 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1526 free:   cm_free_msg(msg);
1527 deref:  cm_deref_id(cm_id_priv);
1528 }
1529
1530 static int cm_rep_handler(struct cm_work *work)
1531 {
1532         struct cm_id_private *cm_id_priv;
1533         struct cm_rep_msg *rep_msg;
1534         unsigned long flags;
1535         int ret;
1536
1537         rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1538         cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0);
1539         if (!cm_id_priv) {
1540                 cm_dup_rep_handler(work);
1541                 return -EINVAL;
1542         }
1543
1544         cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id;
1545         cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid;
1546         cm_id_priv->timewait_info->remote_qpn = cm_rep_get_local_qpn(rep_msg);
1547
1548         spin_lock_irqsave(&cm.lock, flags);
1549         /* Check for duplicate REP. */
1550         if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
1551                 spin_unlock_irqrestore(&cm.lock, flags);
1552                 ret = -EINVAL;
1553                 goto error;
1554         }
1555         /* Check for a stale connection. */
1556         if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) {
1557                 spin_unlock_irqrestore(&cm.lock, flags);
1558                 cm_issue_rej(work->port, work->mad_recv_wc,
1559                              IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP,
1560                              NULL, 0);
1561                 ret = -EINVAL;
1562                 goto error;
1563         }
1564         spin_unlock_irqrestore(&cm.lock, flags);
1565
1566         cm_format_rep_event(work);
1567
1568         spin_lock_irqsave(&cm_id_priv->lock, flags);
1569         switch (cm_id_priv->id.state) {
1570         case IB_CM_REQ_SENT:
1571         case IB_CM_MRA_REQ_RCVD:
1572                 break;
1573         default:
1574                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1575                 ret = -EINVAL;
1576                 goto error;
1577         }
1578         cm_id_priv->id.state = IB_CM_REP_RCVD;
1579         cm_id_priv->id.remote_id = rep_msg->local_comm_id;
1580         cm_id_priv->remote_qpn = cm_rep_get_local_qpn(rep_msg);
1581         cm_id_priv->initiator_depth = rep_msg->resp_resources;
1582         cm_id_priv->responder_resources = rep_msg->initiator_depth;
1583         cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg);
1584         cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1585
1586         /* todo: handle peer_to_peer */
1587
1588         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1589         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1590         if (!ret)
1591                 list_add_tail(&work->list, &cm_id_priv->work_list);
1592         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1593
1594         if (ret)
1595                 cm_process_work(cm_id_priv, work);
1596         else
1597                 cm_deref_id(cm_id_priv);
1598         return 0;
1599
1600 error:  cm_cleanup_timewait(cm_id_priv->timewait_info);
1601         cm_deref_id(cm_id_priv);
1602         return ret;
1603 }
1604
1605 static int cm_establish_handler(struct cm_work *work)
1606 {
1607         struct cm_id_private *cm_id_priv;
1608         unsigned long flags;
1609         int ret;
1610
1611         /* See comment in ib_cm_establish about lookup. */
1612         cm_id_priv = cm_acquire_id(work->local_id, work->remote_id);
1613         if (!cm_id_priv)
1614                 return -EINVAL;
1615
1616         spin_lock_irqsave(&cm_id_priv->lock, flags);
1617         if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
1618                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1619                 goto out;
1620         }
1621
1622         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1623         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1624         if (!ret)
1625                 list_add_tail(&work->list, &cm_id_priv->work_list);
1626         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1627
1628         if (ret)
1629                 cm_process_work(cm_id_priv, work);
1630         else
1631                 cm_deref_id(cm_id_priv);
1632         return 0;
1633 out:
1634         cm_deref_id(cm_id_priv);
1635         return -EINVAL;
1636 }
1637
1638 static int cm_rtu_handler(struct cm_work *work)
1639 {
1640         struct cm_id_private *cm_id_priv;
1641         struct cm_rtu_msg *rtu_msg;
1642         unsigned long flags;
1643         int ret;
1644
1645         rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad;
1646         cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id,
1647                                    rtu_msg->local_comm_id);
1648         if (!cm_id_priv)
1649                 return -EINVAL;
1650
1651         work->cm_event.private_data = &rtu_msg->private_data;
1652
1653         spin_lock_irqsave(&cm_id_priv->lock, flags);
1654         if (cm_id_priv->id.state != IB_CM_REP_SENT &&
1655             cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
1656                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1657                 goto out;
1658         }
1659         cm_id_priv->id.state = IB_CM_ESTABLISHED;
1660
1661         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1662         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1663         if (!ret)
1664                 list_add_tail(&work->list, &cm_id_priv->work_list);
1665         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1666
1667         if (ret)
1668                 cm_process_work(cm_id_priv, work);
1669         else
1670                 cm_deref_id(cm_id_priv);
1671         return 0;
1672 out:
1673         cm_deref_id(cm_id_priv);
1674         return -EINVAL;
1675 }
1676
1677 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg,
1678                           struct cm_id_private *cm_id_priv,
1679                           const void *private_data,
1680                           u8 private_data_len)
1681 {
1682         cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID,
1683                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ));
1684         dreq_msg->local_comm_id = cm_id_priv->id.local_id;
1685         dreq_msg->remote_comm_id = cm_id_priv->id.remote_id;
1686         cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn);
1687
1688         if (private_data && private_data_len)
1689                 memcpy(dreq_msg->private_data, private_data, private_data_len);
1690 }
1691
1692 int ib_send_cm_dreq(struct ib_cm_id *cm_id,
1693                     const void *private_data,
1694                     u8 private_data_len)
1695 {
1696         struct cm_id_private *cm_id_priv;
1697         struct ib_mad_send_buf *msg;
1698         unsigned long flags;
1699         int ret;
1700
1701         if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE)
1702                 return -EINVAL;
1703
1704         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1705         spin_lock_irqsave(&cm_id_priv->lock, flags);
1706         if (cm_id->state != IB_CM_ESTABLISHED) {
1707                 ret = -EINVAL;
1708                 goto out;
1709         }
1710
1711         ret = cm_alloc_msg(cm_id_priv, &msg);
1712         if (ret) {
1713                 cm_enter_timewait(cm_id_priv);
1714                 goto out;
1715         }
1716
1717         cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv,
1718                        private_data, private_data_len);
1719         msg->timeout_ms = cm_id_priv->timeout_ms;
1720         msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
1721
1722         ret = ib_post_send_mad(msg, NULL);
1723         if (ret) {
1724                 cm_enter_timewait(cm_id_priv);
1725                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1726                 cm_free_msg(msg);
1727                 return ret;
1728         }
1729
1730         cm_id->state = IB_CM_DREQ_SENT;
1731         cm_id_priv->msg = msg;
1732 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1733         return ret;
1734 }
1735 EXPORT_SYMBOL(ib_send_cm_dreq);
1736
1737 static void cm_format_drep(struct cm_drep_msg *drep_msg,
1738                           struct cm_id_private *cm_id_priv,
1739                           const void *private_data,
1740                           u8 private_data_len)
1741 {
1742         cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid);
1743         drep_msg->local_comm_id = cm_id_priv->id.local_id;
1744         drep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1745
1746         if (private_data && private_data_len)
1747                 memcpy(drep_msg->private_data, private_data, private_data_len);
1748 }
1749
1750 int ib_send_cm_drep(struct ib_cm_id *cm_id,
1751                     const void *private_data,
1752                     u8 private_data_len)
1753 {
1754         struct cm_id_private *cm_id_priv;
1755         struct ib_mad_send_buf *msg;
1756         unsigned long flags;
1757         void *data;
1758         int ret;
1759
1760         if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
1761                 return -EINVAL;
1762
1763         data = cm_copy_private_data(private_data, private_data_len);
1764         if (IS_ERR(data))
1765                 return PTR_ERR(data);
1766
1767         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1768         spin_lock_irqsave(&cm_id_priv->lock, flags);
1769         if (cm_id->state != IB_CM_DREQ_RCVD) {
1770                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1771                 kfree(data);
1772                 return -EINVAL;
1773         }
1774
1775         cm_set_private_data(cm_id_priv, data, private_data_len);
1776         cm_enter_timewait(cm_id_priv);
1777
1778         ret = cm_alloc_msg(cm_id_priv, &msg);
1779         if (ret)
1780                 goto out;
1781
1782         cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
1783                        private_data, private_data_len);
1784
1785         ret = ib_post_send_mad(msg, NULL);
1786         if (ret) {
1787                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1788                 cm_free_msg(msg);
1789                 return ret;
1790         }
1791
1792 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1793         return ret;
1794 }
1795 EXPORT_SYMBOL(ib_send_cm_drep);
1796
1797 static int cm_dreq_handler(struct cm_work *work)
1798 {
1799         struct cm_id_private *cm_id_priv;
1800         struct cm_dreq_msg *dreq_msg;
1801         struct ib_mad_send_buf *msg = NULL;
1802         unsigned long flags;
1803         int ret;
1804
1805         dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
1806         cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id,
1807                                    dreq_msg->local_comm_id);
1808         if (!cm_id_priv)
1809                 return -EINVAL;
1810
1811         work->cm_event.private_data = &dreq_msg->private_data;
1812
1813         spin_lock_irqsave(&cm_id_priv->lock, flags);
1814         if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg))
1815                 goto unlock;
1816
1817         switch (cm_id_priv->id.state) {
1818         case IB_CM_REP_SENT:
1819         case IB_CM_DREQ_SENT:
1820                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1821                 break;
1822         case IB_CM_ESTABLISHED:
1823         case IB_CM_MRA_REP_RCVD:
1824                 break;
1825         case IB_CM_TIMEWAIT:
1826                 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
1827                         goto unlock;
1828
1829                 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
1830                                cm_id_priv->private_data,
1831                                cm_id_priv->private_data_len);
1832                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1833
1834                 if (ib_post_send_mad(msg, NULL))
1835                         cm_free_msg(msg);
1836                 goto deref;
1837         default:
1838                 goto unlock;
1839         }
1840         cm_id_priv->id.state = IB_CM_DREQ_RCVD;
1841         cm_id_priv->tid = dreq_msg->hdr.tid;
1842         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1843         if (!ret)
1844                 list_add_tail(&work->list, &cm_id_priv->work_list);
1845         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1846
1847         if (ret)
1848                 cm_process_work(cm_id_priv, work);
1849         else
1850                 cm_deref_id(cm_id_priv);
1851         return 0;
1852
1853 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1854 deref:  cm_deref_id(cm_id_priv);
1855         return -EINVAL;
1856 }
1857
1858 static int cm_drep_handler(struct cm_work *work)
1859 {
1860         struct cm_id_private *cm_id_priv;
1861         struct cm_drep_msg *drep_msg;
1862         unsigned long flags;
1863         int ret;
1864
1865         drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
1866         cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id,
1867                                    drep_msg->local_comm_id);
1868         if (!cm_id_priv)
1869                 return -EINVAL;
1870
1871         work->cm_event.private_data = &drep_msg->private_data;
1872
1873         spin_lock_irqsave(&cm_id_priv->lock, flags);
1874         if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
1875             cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
1876                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1877                 goto out;
1878         }
1879         cm_enter_timewait(cm_id_priv);
1880
1881         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1882         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1883         if (!ret)
1884                 list_add_tail(&work->list, &cm_id_priv->work_list);
1885         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1886
1887         if (ret)
1888                 cm_process_work(cm_id_priv, work);
1889         else
1890                 cm_deref_id(cm_id_priv);
1891         return 0;
1892 out:
1893         cm_deref_id(cm_id_priv);
1894         return -EINVAL;
1895 }
1896
1897 int ib_send_cm_rej(struct ib_cm_id *cm_id,
1898                    enum ib_cm_rej_reason reason,
1899                    void *ari,
1900                    u8 ari_length,
1901                    const void *private_data,
1902                    u8 private_data_len)
1903 {
1904         struct cm_id_private *cm_id_priv;
1905         struct ib_mad_send_buf *msg;
1906         unsigned long flags;
1907         int ret;
1908
1909         if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
1910             (ari && ari_length > IB_CM_REJ_ARI_LENGTH))
1911                 return -EINVAL;
1912
1913         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1914
1915         spin_lock_irqsave(&cm_id_priv->lock, flags);
1916         switch (cm_id->state) {
1917         case IB_CM_REQ_SENT:
1918         case IB_CM_MRA_REQ_RCVD:
1919         case IB_CM_REQ_RCVD:
1920         case IB_CM_MRA_REQ_SENT:
1921         case IB_CM_REP_RCVD:
1922         case IB_CM_MRA_REP_SENT:
1923                 ret = cm_alloc_msg(cm_id_priv, &msg);
1924                 if (!ret)
1925                         cm_format_rej((struct cm_rej_msg *) msg->mad,
1926                                       cm_id_priv, reason, ari, ari_length,
1927                                       private_data, private_data_len);
1928
1929                 cm_reset_to_idle(cm_id_priv);
1930                 break;
1931         case IB_CM_REP_SENT:
1932         case IB_CM_MRA_REP_RCVD:
1933                 ret = cm_alloc_msg(cm_id_priv, &msg);
1934                 if (!ret)
1935                         cm_format_rej((struct cm_rej_msg *) msg->mad,
1936                                       cm_id_priv, reason, ari, ari_length,
1937                                       private_data, private_data_len);
1938
1939                 cm_enter_timewait(cm_id_priv);
1940                 break;
1941         default:
1942                 ret = -EINVAL;
1943                 goto out;
1944         }
1945
1946         if (ret)
1947                 goto out;
1948
1949         ret = ib_post_send_mad(msg, NULL);
1950         if (ret)
1951                 cm_free_msg(msg);
1952
1953 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1954         return ret;
1955 }
1956 EXPORT_SYMBOL(ib_send_cm_rej);
1957
1958 static void cm_format_rej_event(struct cm_work *work)
1959 {
1960         struct cm_rej_msg *rej_msg;
1961         struct ib_cm_rej_event_param *param;
1962
1963         rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
1964         param = &work->cm_event.param.rej_rcvd;
1965         param->ari = rej_msg->ari;
1966         param->ari_length = cm_rej_get_reject_info_len(rej_msg);
1967         param->reason = __be16_to_cpu(rej_msg->reason);
1968         work->cm_event.private_data = &rej_msg->private_data;
1969 }
1970
1971 static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
1972 {
1973         struct cm_timewait_info *timewait_info;
1974         struct cm_id_private *cm_id_priv;
1975         unsigned long flags;
1976         __be32 remote_id;
1977
1978         remote_id = rej_msg->local_comm_id;
1979
1980         if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) {
1981                 spin_lock_irqsave(&cm.lock, flags);
1982                 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari),
1983                                                   remote_id);
1984                 if (!timewait_info) {
1985                         spin_unlock_irqrestore(&cm.lock, flags);
1986                         return NULL;
1987                 }
1988                 cm_id_priv = idr_find(&cm.local_id_table,
1989                                       (__force int) timewait_info->work.local_id);
1990                 if (cm_id_priv) {
1991                         if (cm_id_priv->id.remote_id == remote_id)
1992                                 atomic_inc(&cm_id_priv->refcount);
1993                         else
1994                                 cm_id_priv = NULL;
1995                 }
1996                 spin_unlock_irqrestore(&cm.lock, flags);
1997         } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ)
1998                 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0);
1999         else
2000                 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id);
2001
2002         return cm_id_priv;
2003 }
2004
2005 static int cm_rej_handler(struct cm_work *work)
2006 {
2007         struct cm_id_private *cm_id_priv;
2008         struct cm_rej_msg *rej_msg;
2009         unsigned long flags;
2010         int ret;
2011
2012         rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2013         cm_id_priv = cm_acquire_rejected_id(rej_msg);
2014         if (!cm_id_priv)
2015                 return -EINVAL;
2016
2017         cm_format_rej_event(work);
2018
2019         spin_lock_irqsave(&cm_id_priv->lock, flags);
2020         switch (cm_id_priv->id.state) {
2021         case IB_CM_REQ_SENT:
2022         case IB_CM_MRA_REQ_RCVD:
2023         case IB_CM_REP_SENT:
2024         case IB_CM_MRA_REP_RCVD:
2025                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2026                 /* fall through */
2027         case IB_CM_REQ_RCVD:
2028         case IB_CM_MRA_REQ_SENT:
2029                 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN)
2030                         cm_enter_timewait(cm_id_priv);
2031                 else
2032                         cm_reset_to_idle(cm_id_priv);
2033                 break;
2034         case IB_CM_DREQ_SENT:
2035                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2036                 /* fall through */
2037         case IB_CM_REP_RCVD:
2038         case IB_CM_MRA_REP_SENT:
2039         case IB_CM_ESTABLISHED:
2040                 cm_enter_timewait(cm_id_priv);
2041                 break;
2042         default:
2043                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2044                 ret = -EINVAL;
2045                 goto out;
2046         }
2047
2048         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2049         if (!ret)
2050                 list_add_tail(&work->list, &cm_id_priv->work_list);
2051         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2052
2053         if (ret)
2054                 cm_process_work(cm_id_priv, work);
2055         else
2056                 cm_deref_id(cm_id_priv);
2057         return 0;
2058 out:
2059         cm_deref_id(cm_id_priv);
2060         return -EINVAL;
2061 }
2062
2063 int ib_send_cm_mra(struct ib_cm_id *cm_id,
2064                    u8 service_timeout,
2065                    const void *private_data,
2066                    u8 private_data_len)
2067 {
2068         struct cm_id_private *cm_id_priv;
2069         struct ib_mad_send_buf *msg;
2070         void *data;
2071         unsigned long flags;
2072         int ret;
2073
2074         if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE)
2075                 return -EINVAL;
2076
2077         data = cm_copy_private_data(private_data, private_data_len);
2078         if (IS_ERR(data))
2079                 return PTR_ERR(data);
2080
2081         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2082
2083         spin_lock_irqsave(&cm_id_priv->lock, flags);
2084         switch(cm_id_priv->id.state) {
2085         case IB_CM_REQ_RCVD:
2086                 ret = cm_alloc_msg(cm_id_priv, &msg);
2087                 if (ret)
2088                         goto error1;
2089
2090                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2091                               CM_MSG_RESPONSE_REQ, service_timeout,
2092                               private_data, private_data_len);
2093                 ret = ib_post_send_mad(msg, NULL);
2094                 if (ret)
2095                         goto error2;
2096                 cm_id->state = IB_CM_MRA_REQ_SENT;
2097                 break;
2098         case IB_CM_REP_RCVD:
2099                 ret = cm_alloc_msg(cm_id_priv, &msg);
2100                 if (ret)
2101                         goto error1;
2102
2103                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2104                               CM_MSG_RESPONSE_REP, service_timeout,
2105                               private_data, private_data_len);
2106                 ret = ib_post_send_mad(msg, NULL);
2107                 if (ret)
2108                         goto error2;
2109                 cm_id->state = IB_CM_MRA_REP_SENT;
2110                 break;
2111         case IB_CM_ESTABLISHED:
2112                 ret = cm_alloc_msg(cm_id_priv, &msg);
2113                 if (ret)
2114                         goto error1;
2115
2116                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2117                               CM_MSG_RESPONSE_OTHER, service_timeout,
2118                               private_data, private_data_len);
2119                 ret = ib_post_send_mad(msg, NULL);
2120                 if (ret)
2121                         goto error2;
2122                 cm_id->lap_state = IB_CM_MRA_LAP_SENT;
2123                 break;
2124         default:
2125                 ret = -EINVAL;
2126                 goto error1;
2127         }
2128         cm_id_priv->service_timeout = service_timeout;
2129         cm_set_private_data(cm_id_priv, data, private_data_len);
2130         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2131         return 0;
2132
2133 error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2134         kfree(data);
2135         return ret;
2136
2137 error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2138         kfree(data);
2139         cm_free_msg(msg);
2140         return ret;
2141 }
2142 EXPORT_SYMBOL(ib_send_cm_mra);
2143
2144 static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
2145 {
2146         switch (cm_mra_get_msg_mraed(mra_msg)) {
2147         case CM_MSG_RESPONSE_REQ:
2148                 return cm_acquire_id(mra_msg->remote_comm_id, 0);
2149         case CM_MSG_RESPONSE_REP:
2150         case CM_MSG_RESPONSE_OTHER:
2151                 return cm_acquire_id(mra_msg->remote_comm_id,
2152                                      mra_msg->local_comm_id);
2153         default:
2154                 return NULL;
2155         }
2156 }
2157
2158 static int cm_mra_handler(struct cm_work *work)
2159 {
2160         struct cm_id_private *cm_id_priv;
2161         struct cm_mra_msg *mra_msg;
2162         unsigned long flags;
2163         int timeout, ret;
2164
2165         mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
2166         cm_id_priv = cm_acquire_mraed_id(mra_msg);
2167         if (!cm_id_priv)
2168                 return -EINVAL;
2169
2170         work->cm_event.private_data = &mra_msg->private_data;
2171         work->cm_event.param.mra_rcvd.service_timeout =
2172                                         cm_mra_get_service_timeout(mra_msg);
2173         timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) +
2174                   cm_convert_to_ms(cm_id_priv->av.packet_life_time);
2175
2176         spin_lock_irqsave(&cm_id_priv->lock, flags);
2177         switch (cm_id_priv->id.state) {
2178         case IB_CM_REQ_SENT:
2179                 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ ||
2180                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
2181                                   cm_id_priv->msg, timeout))
2182                         goto out;
2183                 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
2184                 break;
2185         case IB_CM_REP_SENT:
2186                 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP ||
2187                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
2188                                   cm_id_priv->msg, timeout))
2189                         goto out;
2190                 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
2191                 break;
2192         case IB_CM_ESTABLISHED:
2193                 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER ||
2194                     cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
2195                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
2196                                   cm_id_priv->msg, timeout))
2197                         goto out;
2198                 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
2199                 break;
2200         default:
2201                 goto out;
2202         }
2203
2204         cm_id_priv->msg->context[1] = (void *) (unsigned long)
2205                                       cm_id_priv->id.state;
2206         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2207         if (!ret)
2208                 list_add_tail(&work->list, &cm_id_priv->work_list);
2209         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2210
2211         if (ret)
2212                 cm_process_work(cm_id_priv, work);
2213         else
2214                 cm_deref_id(cm_id_priv);
2215         return 0;
2216 out:
2217         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2218         cm_deref_id(cm_id_priv);
2219         return -EINVAL;
2220 }
2221
2222 static void cm_format_lap(struct cm_lap_msg *lap_msg,
2223                           struct cm_id_private *cm_id_priv,
2224                           struct ib_sa_path_rec *alternate_path,
2225                           const void *private_data,
2226                           u8 private_data_len)
2227 {
2228         cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID,
2229                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP));
2230         lap_msg->local_comm_id = cm_id_priv->id.local_id;
2231         lap_msg->remote_comm_id = cm_id_priv->id.remote_id;
2232         cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn);
2233         /* todo: need remote CM response timeout */
2234         cm_lap_set_remote_resp_timeout(lap_msg, 0x1F);
2235         lap_msg->alt_local_lid = alternate_path->slid;
2236         lap_msg->alt_remote_lid = alternate_path->dlid;
2237         lap_msg->alt_local_gid = alternate_path->sgid;
2238         lap_msg->alt_remote_gid = alternate_path->dgid;
2239         cm_lap_set_flow_label(lap_msg, alternate_path->flow_label);
2240         cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class);
2241         lap_msg->alt_hop_limit = alternate_path->hop_limit;
2242         cm_lap_set_packet_rate(lap_msg, alternate_path->rate);
2243         cm_lap_set_sl(lap_msg, alternate_path->sl);
2244         cm_lap_set_subnet_local(lap_msg, 1); /* local only... */
2245         cm_lap_set_local_ack_timeout(lap_msg,
2246                 min(31, alternate_path->packet_life_time + 1));
2247
2248         if (private_data && private_data_len)
2249                 memcpy(lap_msg->private_data, private_data, private_data_len);
2250 }
2251
2252 int ib_send_cm_lap(struct ib_cm_id *cm_id,
2253                    struct ib_sa_path_rec *alternate_path,
2254                    const void *private_data,
2255                    u8 private_data_len)
2256 {
2257         struct cm_id_private *cm_id_priv;
2258         struct ib_mad_send_buf *msg;
2259         unsigned long flags;
2260         int ret;
2261
2262         if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE)
2263                 return -EINVAL;
2264
2265         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2266         spin_lock_irqsave(&cm_id_priv->lock, flags);
2267         if (cm_id->state != IB_CM_ESTABLISHED ||
2268             cm_id->lap_state != IB_CM_LAP_IDLE) {
2269                 ret = -EINVAL;
2270                 goto out;
2271         }
2272
2273         ret = cm_alloc_msg(cm_id_priv, &msg);
2274         if (ret)
2275                 goto out;
2276
2277         cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv,
2278                       alternate_path, private_data, private_data_len);
2279         msg->timeout_ms = cm_id_priv->timeout_ms;
2280         msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED;
2281
2282         ret = ib_post_send_mad(msg, NULL);
2283         if (ret) {
2284                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2285                 cm_free_msg(msg);
2286                 return ret;
2287         }
2288
2289         cm_id->lap_state = IB_CM_LAP_SENT;
2290         cm_id_priv->msg = msg;
2291
2292 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2293         return ret;
2294 }
2295 EXPORT_SYMBOL(ib_send_cm_lap);
2296
2297 static void cm_format_path_from_lap(struct ib_sa_path_rec *path,
2298                                     struct cm_lap_msg *lap_msg)
2299 {
2300         memset(path, 0, sizeof *path);
2301         path->dgid = lap_msg->alt_local_gid;
2302         path->sgid = lap_msg->alt_remote_gid;
2303         path->dlid = lap_msg->alt_local_lid;
2304         path->slid = lap_msg->alt_remote_lid;
2305         path->flow_label = cm_lap_get_flow_label(lap_msg);
2306         path->hop_limit = lap_msg->alt_hop_limit;
2307         path->traffic_class = cm_lap_get_traffic_class(lap_msg);
2308         path->reversible = 1;
2309         /* pkey is same as in REQ */
2310         path->sl = cm_lap_get_sl(lap_msg);
2311         path->mtu_selector = IB_SA_EQ;
2312         /* mtu is same as in REQ */
2313         path->rate_selector = IB_SA_EQ;
2314         path->rate = cm_lap_get_packet_rate(lap_msg);
2315         path->packet_life_time_selector = IB_SA_EQ;
2316         path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg);
2317         path->packet_life_time -= (path->packet_life_time > 0);
2318 }
2319
2320 static int cm_lap_handler(struct cm_work *work)
2321 {
2322         struct cm_id_private *cm_id_priv;
2323         struct cm_lap_msg *lap_msg;
2324         struct ib_cm_lap_event_param *param;
2325         struct ib_mad_send_buf *msg = NULL;
2326         unsigned long flags;
2327         int ret;
2328
2329         /* todo: verify LAP request and send reject APR if invalid. */
2330         lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
2331         cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id,
2332                                    lap_msg->local_comm_id);
2333         if (!cm_id_priv)
2334                 return -EINVAL;
2335
2336         param = &work->cm_event.param.lap_rcvd;
2337         param->alternate_path = &work->path[0];
2338         cm_format_path_from_lap(param->alternate_path, lap_msg);
2339         work->cm_event.private_data = &lap_msg->private_data;
2340
2341         spin_lock_irqsave(&cm_id_priv->lock, flags);
2342         if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
2343                 goto unlock;
2344
2345         switch (cm_id_priv->id.lap_state) {
2346         case IB_CM_LAP_IDLE:
2347                 break;
2348         case IB_CM_MRA_LAP_SENT:
2349                 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2350                         goto unlock;
2351
2352                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2353                               CM_MSG_RESPONSE_OTHER,
2354                               cm_id_priv->service_timeout,
2355                               cm_id_priv->private_data,
2356                               cm_id_priv->private_data_len);
2357                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2358
2359                 if (ib_post_send_mad(msg, NULL))
2360                         cm_free_msg(msg);
2361                 goto deref;
2362         default:
2363                 goto unlock;
2364         }
2365
2366         cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
2367         cm_id_priv->tid = lap_msg->hdr.tid;
2368         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2369         if (!ret)
2370                 list_add_tail(&work->list, &cm_id_priv->work_list);
2371         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2372
2373         if (ret)
2374                 cm_process_work(cm_id_priv, work);
2375         else
2376                 cm_deref_id(cm_id_priv);
2377         return 0;
2378
2379 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2380 deref:  cm_deref_id(cm_id_priv);
2381         return -EINVAL;
2382 }
2383
2384 static void cm_format_apr(struct cm_apr_msg *apr_msg,
2385                           struct cm_id_private *cm_id_priv,
2386                           enum ib_cm_apr_status status,
2387                           void *info,
2388                           u8 info_length,
2389                           const void *private_data,
2390                           u8 private_data_len)
2391 {
2392         cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid);
2393         apr_msg->local_comm_id = cm_id_priv->id.local_id;
2394         apr_msg->remote_comm_id = cm_id_priv->id.remote_id;
2395         apr_msg->ap_status = (u8) status;
2396
2397         if (info && info_length) {
2398                 apr_msg->info_length = info_length;
2399                 memcpy(apr_msg->info, info, info_length);
2400         }
2401
2402         if (private_data && private_data_len)
2403                 memcpy(apr_msg->private_data, private_data, private_data_len);
2404 }
2405
2406 int ib_send_cm_apr(struct ib_cm_id *cm_id,
2407                    enum ib_cm_apr_status status,
2408                    void *info,
2409                    u8 info_length,
2410                    const void *private_data,
2411                    u8 private_data_len)
2412 {
2413         struct cm_id_private *cm_id_priv;
2414         struct ib_mad_send_buf *msg;
2415         unsigned long flags;
2416         int ret;
2417
2418         if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) ||
2419             (info && info_length > IB_CM_APR_INFO_LENGTH))
2420                 return -EINVAL;
2421
2422         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2423         spin_lock_irqsave(&cm_id_priv->lock, flags);
2424         if (cm_id->state != IB_CM_ESTABLISHED ||
2425             (cm_id->lap_state != IB_CM_LAP_RCVD &&
2426              cm_id->lap_state != IB_CM_MRA_LAP_SENT)) {
2427                 ret = -EINVAL;
2428                 goto out;
2429         }
2430
2431         ret = cm_alloc_msg(cm_id_priv, &msg);
2432         if (ret)
2433                 goto out;
2434
2435         cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status,
2436                       info, info_length, private_data, private_data_len);
2437         ret = ib_post_send_mad(msg, NULL);
2438         if (ret) {
2439                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2440                 cm_free_msg(msg);
2441                 return ret;
2442         }
2443
2444         cm_id->lap_state = IB_CM_LAP_IDLE;
2445 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2446         return ret;
2447 }
2448 EXPORT_SYMBOL(ib_send_cm_apr);
2449
2450 static int cm_apr_handler(struct cm_work *work)
2451 {
2452         struct cm_id_private *cm_id_priv;
2453         struct cm_apr_msg *apr_msg;
2454         unsigned long flags;
2455         int ret;
2456
2457         apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
2458         cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id,
2459                                    apr_msg->local_comm_id);
2460         if (!cm_id_priv)
2461                 return -EINVAL; /* Unmatched reply. */
2462
2463         work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status;
2464         work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info;
2465         work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length;
2466         work->cm_event.private_data = &apr_msg->private_data;
2467
2468         spin_lock_irqsave(&cm_id_priv->lock, flags);
2469         if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
2470             (cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
2471              cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
2472                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2473                 goto out;
2474         }
2475         cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
2476         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2477         cm_id_priv->msg = NULL;
2478
2479         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2480         if (!ret)
2481                 list_add_tail(&work->list, &cm_id_priv->work_list);
2482         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2483
2484         if (ret)
2485                 cm_process_work(cm_id_priv, work);
2486         else
2487                 cm_deref_id(cm_id_priv);
2488         return 0;
2489 out:
2490         cm_deref_id(cm_id_priv);
2491         return -EINVAL;
2492 }
2493
2494 static int cm_timewait_handler(struct cm_work *work)
2495 {
2496         struct cm_timewait_info *timewait_info;
2497         struct cm_id_private *cm_id_priv;
2498         unsigned long flags;
2499         int ret;
2500
2501         timewait_info = (struct cm_timewait_info *)work;
2502         cm_cleanup_timewait(timewait_info);
2503
2504         cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
2505                                    timewait_info->work.remote_id);
2506         if (!cm_id_priv)
2507                 return -EINVAL;
2508
2509         spin_lock_irqsave(&cm_id_priv->lock, flags);
2510         if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
2511             cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
2512                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2513                 goto out;
2514         }
2515         cm_id_priv->id.state = IB_CM_IDLE;
2516         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2517         if (!ret)
2518                 list_add_tail(&work->list, &cm_id_priv->work_list);
2519         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2520
2521         if (ret)
2522                 cm_process_work(cm_id_priv, work);
2523         else
2524                 cm_deref_id(cm_id_priv);
2525         return 0;
2526 out:
2527         cm_deref_id(cm_id_priv);
2528         return -EINVAL;
2529 }
2530
2531 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
2532                                struct cm_id_private *cm_id_priv,
2533                                struct ib_cm_sidr_req_param *param)
2534 {
2535         cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
2536                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR));
2537         sidr_req_msg->request_id = cm_id_priv->id.local_id;
2538         sidr_req_msg->pkey = cpu_to_be16(param->pkey);
2539         sidr_req_msg->service_id = param->service_id;
2540
2541         if (param->private_data && param->private_data_len)
2542                 memcpy(sidr_req_msg->private_data, param->private_data,
2543                        param->private_data_len);
2544 }
2545
2546 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
2547                         struct ib_cm_sidr_req_param *param)
2548 {
2549         struct cm_id_private *cm_id_priv;
2550         struct ib_mad_send_buf *msg;
2551         unsigned long flags;
2552         int ret;
2553
2554         if (!param->path || (param->private_data &&
2555              param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
2556                 return -EINVAL;
2557
2558         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2559         ret = cm_init_av_by_path(param->path, &cm_id_priv->av);
2560         if (ret)
2561                 goto out;
2562
2563         cm_id->service_id = param->service_id;
2564         cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
2565         cm_id_priv->timeout_ms = param->timeout_ms;
2566         cm_id_priv->max_cm_retries = param->max_cm_retries;
2567         ret = cm_alloc_msg(cm_id_priv, &msg);
2568         if (ret)
2569                 goto out;
2570
2571         cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv,
2572                            param);
2573         msg->timeout_ms = cm_id_priv->timeout_ms;
2574         msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT;
2575
2576         spin_lock_irqsave(&cm_id_priv->lock, flags);
2577         if (cm_id->state == IB_CM_IDLE)
2578                 ret = ib_post_send_mad(msg, NULL);
2579         else
2580                 ret = -EINVAL;
2581
2582         if (ret) {
2583                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2584                 cm_free_msg(msg);
2585                 goto out;
2586         }
2587         cm_id->state = IB_CM_SIDR_REQ_SENT;
2588         cm_id_priv->msg = msg;
2589         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2590 out:
2591         return ret;
2592 }
2593 EXPORT_SYMBOL(ib_send_cm_sidr_req);
2594
2595 static void cm_format_sidr_req_event(struct cm_work *work,
2596                                      struct ib_cm_id *listen_id)
2597 {
2598         struct cm_sidr_req_msg *sidr_req_msg;
2599         struct ib_cm_sidr_req_event_param *param;
2600
2601         sidr_req_msg = (struct cm_sidr_req_msg *)
2602                                 work->mad_recv_wc->recv_buf.mad;
2603         param = &work->cm_event.param.sidr_req_rcvd;
2604         param->pkey = __be16_to_cpu(sidr_req_msg->pkey);
2605         param->listen_id = listen_id;
2606         param->port = work->port->port_num;
2607         work->cm_event.private_data = &sidr_req_msg->private_data;
2608 }
2609
2610 static int cm_sidr_req_handler(struct cm_work *work)
2611 {
2612         struct ib_cm_id *cm_id;
2613         struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
2614         struct cm_sidr_req_msg *sidr_req_msg;
2615         struct ib_wc *wc;
2616         unsigned long flags;
2617
2618         cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL);
2619         if (IS_ERR(cm_id))
2620                 return PTR_ERR(cm_id);
2621         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2622
2623         /* Record SGID/SLID and request ID for lookup. */
2624         sidr_req_msg = (struct cm_sidr_req_msg *)
2625                                 work->mad_recv_wc->recv_buf.mad;
2626         wc = work->mad_recv_wc->wc;
2627         cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid);
2628         cm_id_priv->av.dgid.global.interface_id = 0;
2629         cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2630                                 &cm_id_priv->av);
2631         cm_id_priv->id.remote_id = sidr_req_msg->request_id;
2632         cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
2633         cm_id_priv->tid = sidr_req_msg->hdr.tid;
2634         atomic_inc(&cm_id_priv->work_count);
2635
2636         spin_lock_irqsave(&cm.lock, flags);
2637         cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
2638         if (cur_cm_id_priv) {
2639                 spin_unlock_irqrestore(&cm.lock, flags);
2640                 goto out; /* Duplicate message. */
2641         }
2642         cur_cm_id_priv = cm_find_listen(cm_id->device,
2643                                         sidr_req_msg->service_id);
2644         if (!cur_cm_id_priv) {
2645                 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
2646                 spin_unlock_irqrestore(&cm.lock, flags);
2647                 /* todo: reply with no match */
2648                 goto out; /* No match. */
2649         }
2650         atomic_inc(&cur_cm_id_priv->refcount);
2651         spin_unlock_irqrestore(&cm.lock, flags);
2652
2653         cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler;
2654         cm_id_priv->id.context = cur_cm_id_priv->id.context;
2655         cm_id_priv->id.service_id = sidr_req_msg->service_id;
2656         cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL);
2657
2658         cm_format_sidr_req_event(work, &cur_cm_id_priv->id);
2659         cm_process_work(cm_id_priv, work);
2660         cm_deref_id(cur_cm_id_priv);
2661         return 0;
2662 out:
2663         ib_destroy_cm_id(&cm_id_priv->id);
2664         return -EINVAL;
2665 }
2666
2667 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
2668                                struct cm_id_private *cm_id_priv,
2669                                struct ib_cm_sidr_rep_param *param)
2670 {
2671         cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
2672                           cm_id_priv->tid);
2673         sidr_rep_msg->request_id = cm_id_priv->id.remote_id;
2674         sidr_rep_msg->status = param->status;
2675         cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num));
2676         sidr_rep_msg->service_id = cm_id_priv->id.service_id;
2677         sidr_rep_msg->qkey = cpu_to_be32(param->qkey);
2678
2679         if (param->info && param->info_length)
2680                 memcpy(sidr_rep_msg->info, param->info, param->info_length);
2681
2682         if (param->private_data && param->private_data_len)
2683                 memcpy(sidr_rep_msg->private_data, param->private_data,
2684                        param->private_data_len);
2685 }
2686
2687 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
2688                         struct ib_cm_sidr_rep_param *param)
2689 {
2690         struct cm_id_private *cm_id_priv;
2691         struct ib_mad_send_buf *msg;
2692         unsigned long flags;
2693         int ret;
2694
2695         if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
2696             (param->private_data &&
2697              param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE))
2698                 return -EINVAL;
2699
2700         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2701         spin_lock_irqsave(&cm_id_priv->lock, flags);
2702         if (cm_id->state != IB_CM_SIDR_REQ_RCVD) {
2703                 ret = -EINVAL;
2704                 goto error;
2705         }
2706
2707         ret = cm_alloc_msg(cm_id_priv, &msg);
2708         if (ret)
2709                 goto error;
2710
2711         cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
2712                            param);
2713         ret = ib_post_send_mad(msg, NULL);
2714         if (ret) {
2715                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2716                 cm_free_msg(msg);
2717                 return ret;
2718         }
2719         cm_id->state = IB_CM_IDLE;
2720         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2721
2722         spin_lock_irqsave(&cm.lock, flags);
2723         rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
2724         spin_unlock_irqrestore(&cm.lock, flags);
2725         return 0;
2726
2727 error:  spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2728         return ret;
2729 }
2730 EXPORT_SYMBOL(ib_send_cm_sidr_rep);
2731
2732 static void cm_format_sidr_rep_event(struct cm_work *work)
2733 {
2734         struct cm_sidr_rep_msg *sidr_rep_msg;
2735         struct ib_cm_sidr_rep_event_param *param;
2736
2737         sidr_rep_msg = (struct cm_sidr_rep_msg *)
2738                                 work->mad_recv_wc->recv_buf.mad;
2739         param = &work->cm_event.param.sidr_rep_rcvd;
2740         param->status = sidr_rep_msg->status;
2741         param->qkey = be32_to_cpu(sidr_rep_msg->qkey);
2742         param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg));
2743         param->info = &sidr_rep_msg->info;
2744         param->info_len = sidr_rep_msg->info_length;
2745         work->cm_event.private_data = &sidr_rep_msg->private_data;
2746 }
2747
2748 static int cm_sidr_rep_handler(struct cm_work *work)
2749 {
2750         struct cm_sidr_rep_msg *sidr_rep_msg;
2751         struct cm_id_private *cm_id_priv;
2752         unsigned long flags;
2753
2754         sidr_rep_msg = (struct cm_sidr_rep_msg *)
2755                                 work->mad_recv_wc->recv_buf.mad;
2756         cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0);
2757         if (!cm_id_priv)
2758                 return -EINVAL; /* Unmatched reply. */
2759
2760         spin_lock_irqsave(&cm_id_priv->lock, flags);
2761         if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
2762                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2763                 goto out;
2764         }
2765         cm_id_priv->id.state = IB_CM_IDLE;
2766         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2767         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2768
2769         cm_format_sidr_rep_event(work);
2770         cm_process_work(cm_id_priv, work);
2771         return 0;
2772 out:
2773         cm_deref_id(cm_id_priv);
2774         return -EINVAL;
2775 }
2776
2777 static void cm_process_send_error(struct ib_mad_send_buf *msg,
2778                                   enum ib_wc_status wc_status)
2779 {
2780         struct cm_id_private *cm_id_priv;
2781         struct ib_cm_event cm_event;
2782         enum ib_cm_state state;
2783         unsigned long flags;
2784         int ret;
2785
2786         memset(&cm_event, 0, sizeof cm_event);
2787         cm_id_priv = msg->context[0];
2788
2789         /* Discard old sends or ones without a response. */
2790         spin_lock_irqsave(&cm_id_priv->lock, flags);
2791         state = (enum ib_cm_state) (unsigned long) msg->context[1];
2792         if (msg != cm_id_priv->msg || state != cm_id_priv->id.state)
2793                 goto discard;
2794
2795         switch (state) {
2796         case IB_CM_REQ_SENT:
2797         case IB_CM_MRA_REQ_RCVD:
2798                 cm_reset_to_idle(cm_id_priv);
2799                 cm_event.event = IB_CM_REQ_ERROR;
2800                 break;
2801         case IB_CM_REP_SENT:
2802         case IB_CM_MRA_REP_RCVD:
2803                 cm_reset_to_idle(cm_id_priv);
2804                 cm_event.event = IB_CM_REP_ERROR;
2805                 break;
2806         case IB_CM_DREQ_SENT:
2807                 cm_enter_timewait(cm_id_priv);
2808                 cm_event.event = IB_CM_DREQ_ERROR;
2809                 break;
2810         case IB_CM_SIDR_REQ_SENT:
2811                 cm_id_priv->id.state = IB_CM_IDLE;
2812                 cm_event.event = IB_CM_SIDR_REQ_ERROR;
2813                 break;
2814         default:
2815                 goto discard;
2816         }
2817         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2818         cm_event.param.send_status = wc_status;
2819
2820         /* No other events can occur on the cm_id at this point. */
2821         ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
2822         cm_free_msg(msg);
2823         if (ret)
2824                 ib_destroy_cm_id(&cm_id_priv->id);
2825         return;
2826 discard:
2827         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2828         cm_free_msg(msg);
2829 }
2830
2831 static void cm_send_handler(struct ib_mad_agent *mad_agent,
2832                             struct ib_mad_send_wc *mad_send_wc)
2833 {
2834         struct ib_mad_send_buf *msg = mad_send_wc->send_buf;
2835
2836         switch (mad_send_wc->status) {
2837         case IB_WC_SUCCESS:
2838         case IB_WC_WR_FLUSH_ERR:
2839                 cm_free_msg(msg);
2840                 break;
2841         default:
2842                 if (msg->context[0] && msg->context[1])
2843                         cm_process_send_error(msg, mad_send_wc->status);
2844                 else
2845                         cm_free_msg(msg);
2846                 break;
2847         }
2848 }
2849
2850 static void cm_work_handler(void *data)
2851 {
2852         struct cm_work *work = data;
2853         int ret;
2854
2855         switch (work->cm_event.event) {
2856         case IB_CM_REQ_RECEIVED:
2857                 ret = cm_req_handler(work);
2858                 break;
2859         case IB_CM_MRA_RECEIVED:
2860                 ret = cm_mra_handler(work);
2861                 break;
2862         case IB_CM_REJ_RECEIVED:
2863                 ret = cm_rej_handler(work);
2864                 break;
2865         case IB_CM_REP_RECEIVED:
2866                 ret = cm_rep_handler(work);
2867                 break;
2868         case IB_CM_RTU_RECEIVED:
2869                 ret = cm_rtu_handler(work);
2870                 break;
2871         case IB_CM_USER_ESTABLISHED:
2872                 ret = cm_establish_handler(work);
2873                 break;
2874         case IB_CM_DREQ_RECEIVED:
2875                 ret = cm_dreq_handler(work);
2876                 break;
2877         case IB_CM_DREP_RECEIVED:
2878                 ret = cm_drep_handler(work);
2879                 break;
2880         case IB_CM_SIDR_REQ_RECEIVED:
2881                 ret = cm_sidr_req_handler(work);
2882                 break;
2883         case IB_CM_SIDR_REP_RECEIVED:
2884                 ret = cm_sidr_rep_handler(work);
2885                 break;
2886         case IB_CM_LAP_RECEIVED:
2887                 ret = cm_lap_handler(work);
2888                 break;
2889         case IB_CM_APR_RECEIVED:
2890                 ret = cm_apr_handler(work);
2891                 break;
2892         case IB_CM_TIMEWAIT_EXIT:
2893                 ret = cm_timewait_handler(work);
2894                 break;
2895         default:
2896                 ret = -EINVAL;
2897                 break;
2898         }
2899         if (ret)
2900                 cm_free_work(work);
2901 }
2902
2903 int ib_cm_establish(struct ib_cm_id *cm_id)
2904 {
2905         struct cm_id_private *cm_id_priv;
2906         struct cm_work *work;
2907         unsigned long flags;
2908         int ret = 0;
2909
2910         work = kmalloc(sizeof *work, GFP_ATOMIC);
2911         if (!work)
2912                 return -ENOMEM;
2913
2914         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2915         spin_lock_irqsave(&cm_id_priv->lock, flags);
2916         switch (cm_id->state)
2917         {
2918         case IB_CM_REP_SENT:
2919         case IB_CM_MRA_REP_RCVD:
2920                 cm_id->state = IB_CM_ESTABLISHED;
2921                 break;
2922         case IB_CM_ESTABLISHED:
2923                 ret = -EISCONN;
2924                 break;
2925         default:
2926                 ret = -EINVAL;
2927                 break;
2928         }
2929         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2930
2931         if (ret) {
2932                 kfree(work);
2933                 goto out;
2934         }
2935
2936         /*
2937          * The CM worker thread may try to destroy the cm_id before it
2938          * can execute this work item.  To prevent potential deadlock,
2939          * we need to find the cm_id once we're in the context of the
2940          * worker thread, rather than holding a reference on it.
2941          */
2942         INIT_WORK(&work->work, cm_work_handler, work);
2943         work->local_id = cm_id->local_id;
2944         work->remote_id = cm_id->remote_id;
2945         work->mad_recv_wc = NULL;
2946         work->cm_event.event = IB_CM_USER_ESTABLISHED;
2947         queue_work(cm.wq, &work->work);
2948 out:
2949         return ret;
2950 }
2951 EXPORT_SYMBOL(ib_cm_establish);
2952
2953 static void cm_recv_handler(struct ib_mad_agent *mad_agent,
2954                             struct ib_mad_recv_wc *mad_recv_wc)
2955 {
2956         struct cm_work *work;
2957         enum ib_cm_event_type event;
2958         int paths = 0;
2959
2960         switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
2961         case CM_REQ_ATTR_ID:
2962                 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)->
2963                                                     alt_local_lid != 0);
2964                 event = IB_CM_REQ_RECEIVED;
2965                 break;
2966         case CM_MRA_ATTR_ID:
2967                 event = IB_CM_MRA_RECEIVED;
2968                 break;
2969         case CM_REJ_ATTR_ID:
2970                 event = IB_CM_REJ_RECEIVED;
2971                 break;
2972         case CM_REP_ATTR_ID:
2973                 event = IB_CM_REP_RECEIVED;
2974                 break;
2975         case CM_RTU_ATTR_ID:
2976                 event = IB_CM_RTU_RECEIVED;
2977                 break;
2978         case CM_DREQ_ATTR_ID:
2979                 event = IB_CM_DREQ_RECEIVED;
2980                 break;
2981         case CM_DREP_ATTR_ID:
2982                 event = IB_CM_DREP_RECEIVED;
2983                 break;
2984         case CM_SIDR_REQ_ATTR_ID:
2985                 event = IB_CM_SIDR_REQ_RECEIVED;
2986                 break;
2987         case CM_SIDR_REP_ATTR_ID:
2988                 event = IB_CM_SIDR_REP_RECEIVED;
2989                 break;
2990         case CM_LAP_ATTR_ID:
2991                 paths = 1;
2992                 event = IB_CM_LAP_RECEIVED;
2993                 break;
2994         case CM_APR_ATTR_ID:
2995                 event = IB_CM_APR_RECEIVED;
2996                 break;
2997         default:
2998                 ib_free_recv_mad(mad_recv_wc);
2999                 return;
3000         }
3001
3002         work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths,
3003                        GFP_KERNEL);
3004         if (!work) {
3005                 ib_free_recv_mad(mad_recv_wc);
3006                 return;
3007         }
3008
3009         INIT_WORK(&work->work, cm_work_handler, work);
3010         work->cm_event.event = event;
3011         work->mad_recv_wc = mad_recv_wc;
3012         work->port = (struct cm_port *)mad_agent->context;
3013         queue_work(cm.wq, &work->work);
3014 }
3015
3016 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
3017                                 struct ib_qp_attr *qp_attr,
3018                                 int *qp_attr_mask)
3019 {
3020         unsigned long flags;
3021         int ret;
3022
3023         spin_lock_irqsave(&cm_id_priv->lock, flags);
3024         switch (cm_id_priv->id.state) {
3025         case IB_CM_REQ_SENT:
3026         case IB_CM_MRA_REQ_RCVD:
3027         case IB_CM_REQ_RCVD:
3028         case IB_CM_MRA_REQ_SENT:
3029         case IB_CM_REP_RCVD:
3030         case IB_CM_MRA_REP_SENT:
3031         case IB_CM_REP_SENT:
3032         case IB_CM_MRA_REP_RCVD:
3033         case IB_CM_ESTABLISHED:
3034                 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
3035                                 IB_QP_PKEY_INDEX | IB_QP_PORT;
3036                 qp_attr->qp_access_flags = IB_ACCESS_LOCAL_WRITE |
3037                                            IB_ACCESS_REMOTE_WRITE;
3038                 if (cm_id_priv->responder_resources)
3039                         qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ;
3040                 qp_attr->pkey_index = cm_id_priv->av.pkey_index;
3041                 qp_attr->port_num = cm_id_priv->av.port->port_num;
3042                 ret = 0;
3043                 break;
3044         default:
3045                 ret = -EINVAL;
3046                 break;
3047         }
3048         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3049         return ret;
3050 }
3051
3052 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
3053                                struct ib_qp_attr *qp_attr,
3054                                int *qp_attr_mask)
3055 {
3056         unsigned long flags;
3057         int ret;
3058
3059         spin_lock_irqsave(&cm_id_priv->lock, flags);
3060         switch (cm_id_priv->id.state) {
3061         case IB_CM_REQ_RCVD:
3062         case IB_CM_MRA_REQ_SENT:
3063         case IB_CM_REP_RCVD:
3064         case IB_CM_MRA_REP_SENT:
3065         case IB_CM_REP_SENT:
3066         case IB_CM_MRA_REP_RCVD:
3067         case IB_CM_ESTABLISHED:
3068                 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
3069                                 IB_QP_DEST_QPN | IB_QP_RQ_PSN;
3070                 qp_attr->ah_attr = cm_id_priv->av.ah_attr;
3071                 qp_attr->path_mtu = cm_id_priv->path_mtu;
3072                 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
3073                 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
3074                 if (cm_id_priv->qp_type == IB_QPT_RC) {
3075                         *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC |
3076                                          IB_QP_MIN_RNR_TIMER;
3077                         qp_attr->max_dest_rd_atomic =
3078                                         cm_id_priv->responder_resources;
3079                         qp_attr->min_rnr_timer = 0;
3080                 }
3081                 if (cm_id_priv->alt_av.ah_attr.dlid) {
3082                         *qp_attr_mask |= IB_QP_ALT_PATH;
3083                         qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3084                 }
3085                 ret = 0;
3086                 break;
3087         default:
3088                 ret = -EINVAL;
3089                 break;
3090         }
3091         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3092         return ret;
3093 }
3094
3095 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv,
3096                                struct ib_qp_attr *qp_attr,
3097                                int *qp_attr_mask)
3098 {
3099         unsigned long flags;
3100         int ret;
3101
3102         spin_lock_irqsave(&cm_id_priv->lock, flags);
3103         switch (cm_id_priv->id.state) {
3104         case IB_CM_REP_RCVD:
3105         case IB_CM_MRA_REP_SENT:
3106         case IB_CM_REP_SENT:
3107         case IB_CM_MRA_REP_RCVD:
3108         case IB_CM_ESTABLISHED:
3109                 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN;
3110                 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn);
3111                 if (cm_id_priv->qp_type == IB_QPT_RC) {
3112                         *qp_attr_mask |= IB_QP_TIMEOUT | IB_QP_RETRY_CNT |
3113                                          IB_QP_RNR_RETRY |
3114                                          IB_QP_MAX_QP_RD_ATOMIC;
3115                         qp_attr->timeout = cm_id_priv->local_ack_timeout;
3116                         qp_attr->retry_cnt = cm_id_priv->retry_count;
3117                         qp_attr->rnr_retry = cm_id_priv->rnr_retry_count;
3118                         qp_attr->max_rd_atomic = cm_id_priv->initiator_depth;
3119                 }
3120                 if (cm_id_priv->alt_av.ah_attr.dlid) {
3121                         *qp_attr_mask |= IB_QP_PATH_MIG_STATE;
3122                         qp_attr->path_mig_state = IB_MIG_REARM;
3123                 }
3124                 ret = 0;
3125                 break;
3126         default:
3127                 ret = -EINVAL;
3128                 break;
3129         }
3130         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3131         return ret;
3132 }
3133
3134 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
3135                        struct ib_qp_attr *qp_attr,
3136                        int *qp_attr_mask)
3137 {
3138         struct cm_id_private *cm_id_priv;
3139         int ret;
3140
3141         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3142         switch (qp_attr->qp_state) {
3143         case IB_QPS_INIT:
3144                 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask);
3145                 break;
3146         case IB_QPS_RTR:
3147                 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask);
3148                 break;
3149         case IB_QPS_RTS:
3150                 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask);
3151                 break;
3152         default:
3153                 ret = -EINVAL;
3154                 break;
3155         }
3156         return ret;
3157 }
3158 EXPORT_SYMBOL(ib_cm_init_qp_attr);
3159
3160 static __be64 cm_get_ca_guid(struct ib_device *device)
3161 {
3162         struct ib_device_attr *device_attr;
3163         __be64 guid;
3164         int ret;
3165
3166         device_attr = kmalloc(sizeof *device_attr, GFP_KERNEL);
3167         if (!device_attr)
3168                 return 0;
3169
3170         ret = ib_query_device(device, device_attr);
3171         guid = ret ? 0 : device_attr->node_guid;
3172         kfree(device_attr);
3173         return guid;
3174 }
3175
3176 static void cm_add_one(struct ib_device *device)
3177 {
3178         struct cm_device *cm_dev;
3179         struct cm_port *port;
3180         struct ib_mad_reg_req reg_req = {
3181                 .mgmt_class = IB_MGMT_CLASS_CM,
3182                 .mgmt_class_version = IB_CM_CLASS_VERSION
3183         };
3184         struct ib_port_modify port_modify = {
3185                 .set_port_cap_mask = IB_PORT_CM_SUP
3186         };
3187         unsigned long flags;
3188         int ret;
3189         u8 i;
3190
3191         cm_dev = kmalloc(sizeof(*cm_dev) + sizeof(*port) *
3192                          device->phys_port_cnt, GFP_KERNEL);
3193         if (!cm_dev)
3194                 return;
3195
3196         cm_dev->device = device;
3197         cm_dev->ca_guid = cm_get_ca_guid(device);
3198         if (!cm_dev->ca_guid)
3199                 goto error1;
3200
3201         set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
3202         for (i = 1; i <= device->phys_port_cnt; i++) {
3203                 port = &cm_dev->port[i-1];
3204                 port->cm_dev = cm_dev;
3205                 port->port_num = i;
3206                 port->mad_agent = ib_register_mad_agent(device, i,
3207                                                         IB_QPT_GSI,
3208                                                         &reg_req,
3209                                                         0,
3210                                                         cm_send_handler,
3211                                                         cm_recv_handler,
3212                                                         port);
3213                 if (IS_ERR(port->mad_agent))
3214                         goto error2;
3215
3216                 ret = ib_modify_port(device, i, 0, &port_modify);
3217                 if (ret)
3218                         goto error3;
3219         }
3220         ib_set_client_data(device, &cm_client, cm_dev);
3221
3222         write_lock_irqsave(&cm.device_lock, flags);
3223         list_add_tail(&cm_dev->list, &cm.device_list);
3224         write_unlock_irqrestore(&cm.device_lock, flags);
3225         return;
3226
3227 error3:
3228         ib_unregister_mad_agent(port->mad_agent);
3229 error2:
3230         port_modify.set_port_cap_mask = 0;
3231         port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
3232         while (--i) {
3233                 port = &cm_dev->port[i-1];
3234                 ib_modify_port(device, port->port_num, 0, &port_modify);
3235                 ib_unregister_mad_agent(port->mad_agent);
3236         }
3237 error1:
3238         kfree(cm_dev);
3239 }
3240
3241 static void cm_remove_one(struct ib_device *device)
3242 {
3243         struct cm_device *cm_dev;
3244         struct cm_port *port;
3245         struct ib_port_modify port_modify = {
3246                 .clr_port_cap_mask = IB_PORT_CM_SUP
3247         };
3248         unsigned long flags;
3249         int i;
3250
3251         cm_dev = ib_get_client_data(device, &cm_client);
3252         if (!cm_dev)
3253                 return;
3254
3255         write_lock_irqsave(&cm.device_lock, flags);
3256         list_del(&cm_dev->list);
3257         write_unlock_irqrestore(&cm.device_lock, flags);
3258
3259         for (i = 1; i <= device->phys_port_cnt; i++) {
3260                 port = &cm_dev->port[i-1];
3261                 ib_modify_port(device, port->port_num, 0, &port_modify);
3262                 ib_unregister_mad_agent(port->mad_agent);
3263         }
3264         kfree(cm_dev);
3265 }
3266
3267 static int __init ib_cm_init(void)
3268 {
3269         int ret;
3270
3271         memset(&cm, 0, sizeof cm);
3272         INIT_LIST_HEAD(&cm.device_list);
3273         rwlock_init(&cm.device_lock);
3274         spin_lock_init(&cm.lock);
3275         cm.listen_service_table = RB_ROOT;
3276         cm.listen_service_id = __constant_be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID);
3277         cm.remote_id_table = RB_ROOT;
3278         cm.remote_qp_table = RB_ROOT;
3279         cm.remote_sidr_table = RB_ROOT;
3280         idr_init(&cm.local_id_table);
3281         idr_pre_get(&cm.local_id_table, GFP_KERNEL);
3282
3283         cm.wq = create_workqueue("ib_cm");
3284         if (!cm.wq)
3285                 return -ENOMEM;
3286
3287         ret = ib_register_client(&cm_client);
3288         if (ret)
3289                 goto error;
3290
3291         return 0;
3292 error:
3293         destroy_workqueue(cm.wq);
3294         return ret;
3295 }
3296
3297 static void __exit ib_cm_cleanup(void)
3298 {
3299         flush_workqueue(cm.wq);
3300         destroy_workqueue(cm.wq);
3301         ib_unregister_client(&cm_client);
3302         idr_destroy(&cm.local_id_table);
3303 }
3304
3305 module_init(ib_cm_init);
3306 module_exit(ib_cm_cleanup);
3307