git.oblomov.eu Git - linux-2.6/blob - drivers/infiniband/core/cm.c

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