drivers/infiniband/core/cm.c

   1 /*
   2  * Copyright (c) 2004, 2005 Intel Corporation.  All rights reserved.
   3  * Copyright (c) 2004 Topspin Corporation.  All rights reserved.
   4  * Copyright (c) 2004, 2005 Voltaire Corporation.  All rights reserved.
   5  * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
   6  *
   7  * This software is available to you under a choice of one of two
   8  * licenses.  You may choose to be licensed under the terms of the GNU
   9  * General Public License (GPL) Version 2, available from the file
  10  * COPYING in the main directory of this source tree, or the
  11  * OpenIB.org BSD license below:
  12  *
  13  *     Redistribution and use in source and binary forms, with or
  14  *     without modification, are permitted provided that the following
  15  *     conditions are met:
  16  *
  17  *      - Redistributions of source code must retain the above
  18  *        copyright notice, this list of conditions and the following
  19  *        disclaimer.
  20  *
  21  *      - Redistributions in binary form must reproduce the above
  22  *        copyright notice, this list of conditions and the following
  23  *        disclaimer in the documentation and/or other materials
  24  *        provided with the distribution.
  25  *
  26  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  27  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  28  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  29  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  30  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  31  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  32  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  33  * SOFTWARE.
  34  *
  35  * $Id: cm.c 2821 2005-07-08 17:07:28Z sean.hefty $
  36  */
  37 #include <linux/dma-mapping.h>
  38 #include <linux/err.h>
  39 #include <linux/idr.h>
  40 #include <linux/interrupt.h>
  41 #include <linux/pci.h>
  42 #include <linux/rbtree.h>
  43 #include <linux/spinlock.h>
  44 #include <linux/workqueue.h>
  45
  46 #include <rdma/ib_cache.h>
  47 #include <rdma/ib_cm.h>
  48 #include "cm_msgs.h"
  49
  50 MODULE_AUTHOR("Sean Hefty");
  51 MODULE_DESCRIPTION("InfiniBand CM");
  52 MODULE_LICENSE("Dual BSD/GPL");
  53
  54 static void cm_add_one(struct ib_device *device);
  55 static void cm_remove_one(struct ib_device *device);
  56
  57 static struct ib_client cm_client = {
  58         .name   = "cm",
  59         .add    = cm_add_one,
  60         .remove = cm_remove_one
  61 };
  62
  63 static struct ib_cm {
  64         spinlock_t lock;
  65         struct list_head device_list;
  66         rwlock_t device_lock;
  67         struct rb_root listen_service_table;
  68         u64 listen_service_id;
  69         /* struct rb_root peer_service_table; todo: fix peer to peer */
  70         struct rb_root remote_qp_table;
  71         struct rb_root remote_id_table;
  72         struct rb_root remote_sidr_table;
  73         struct idr local_id_table;
  74         struct workqueue_struct *wq;
  75 } cm;
  76
  77 struct cm_port {
  78         struct cm_device *cm_dev;
  79         struct ib_mad_agent *mad_agent;
  80         u8 port_num;
  81 };
  82
  83 struct cm_device {
  84         struct list_head list;
  85         struct ib_device *device;
  86         __be64 ca_guid;
  87         struct cm_port port[0];
  88 };
  89
  90 struct cm_av {
  91         struct cm_port *port;
  92         union ib_gid dgid;
  93         struct ib_ah_attr ah_attr;
  94         u16 pkey_index;
  95         u8 packet_life_time;
  96 };
  97
  98 struct cm_work {
  99         struct work_struct work;
 100         struct list_head list;
 101         struct cm_port *port;
 102         struct ib_mad_recv_wc *mad_recv_wc;     /* Received MADs */
 103         __be32 local_id;                        /* Established / timewait */
 104         __be32 remote_id;
 105         struct ib_cm_event cm_event;
 106         struct ib_sa_path_rec path[0];
 107 };
 108
 109 struct cm_timewait_info {
 110         struct cm_work work;                    /* Must be first. */
 111         struct rb_node remote_qp_node;
 112         struct rb_node remote_id_node;
 113         __be64 remote_ca_guid;
 114         __be32 remote_qpn;
 115         u8 inserted_remote_qp;
 116         u8 inserted_remote_id;
 117 };
 118
 119 struct cm_id_private {
 120         struct ib_cm_id id;
 121
 122         struct rb_node service_node;
 123         struct rb_node sidr_id_node;
 124         spinlock_t lock;
 125         wait_queue_head_t wait;
 126         atomic_t refcount;
 127
 128         struct ib_mad_send_buf *msg;
 129         struct cm_timewait_info *timewait_info;
 130         /* todo: use alternate port on send failure */
 131         struct cm_av av;
 132         struct cm_av alt_av;
 133
 134         void *private_data;
 135         __be64 tid;
 136         __be32 local_qpn;
 137         __be32 remote_qpn;
 138         enum ib_qp_type qp_type;
 139         __be32 sq_psn;
 140         __be32 rq_psn;
 141         int timeout_ms;
 142         enum ib_mtu path_mtu;
 143         u8 private_data_len;
 144         u8 max_cm_retries;
 145         u8 peer_to_peer;
 146         u8 responder_resources;
 147         u8 initiator_depth;
 148         u8 local_ack_timeout;
 149         u8 retry_count;
 150         u8 rnr_retry_count;
 151         u8 service_timeout;
 152
 153         struct list_head work_list;
 154         atomic_t work_count;
 155 };
 156
 157 static void cm_work_handler(void *data);
 158
 159 static inline void cm_deref_id(struct cm_id_private *cm_id_priv)
 160 {
 161         if (atomic_dec_and_test(&cm_id_priv->refcount))
 162                 wake_up(&cm_id_priv->wait);
 163 }
 164
 165 static int cm_alloc_msg(struct cm_id_private *cm_id_priv,
 166                         struct ib_mad_send_buf **msg)
 167 {
 168         struct ib_mad_agent *mad_agent;
 169         struct ib_mad_send_buf *m;
 170         struct ib_ah *ah;
 171
 172         mad_agent = cm_id_priv->av.port->mad_agent;
 173         ah = ib_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr);
 174         if (IS_ERR(ah))
 175                 return PTR_ERR(ah);
 176
 177         m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn,
 178                                cm_id_priv->av.pkey_index,
 179                                0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
 180                                GFP_ATOMIC);
 181         if (IS_ERR(m)) {
 182                 ib_destroy_ah(ah);
 183                 return PTR_ERR(m);
 184         }
 185
 186         /* Timeout set by caller if response is expected. */
 187         m->ah = ah;
 188         m->retries = cm_id_priv->max_cm_retries;
 189
 190         atomic_inc(&cm_id_priv->refcount);
 191         m->context[0] = cm_id_priv;
 192         *msg = m;
 193         return 0;
 194 }
 195
 196 static int cm_alloc_response_msg(struct cm_port *port,
 197                                  struct ib_mad_recv_wc *mad_recv_wc,
 198                                  struct ib_mad_send_buf **msg)
 199 {
 200         struct ib_mad_send_buf *m;
 201         struct ib_ah *ah;
 202
 203         ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc,
 204                                   mad_recv_wc->recv_buf.grh, port->port_num);
 205         if (IS_ERR(ah))
 206                 return PTR_ERR(ah);
 207
 208         m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index,
 209                                0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
 210                                GFP_ATOMIC);
 211         if (IS_ERR(m)) {
 212                 ib_destroy_ah(ah);
 213                 return PTR_ERR(m);
 214         }
 215         m->ah = ah;
 216         *msg = m;
 217         return 0;
 218 }
 219
 220 static void cm_free_msg(struct ib_mad_send_buf *msg)
 221 {
 222         ib_destroy_ah(msg->ah);
 223         if (msg->context[0])
 224                 cm_deref_id(msg->context[0]);
 225         ib_free_send_mad(msg);
 226 }
 227
 228 static void * cm_copy_private_data(const void *private_data,
 229                                    u8 private_data_len)
 230 {
 231         void *data;
 232
 233         if (!private_data || !private_data_len)
 234                 return NULL;
 235
 236         data = kmalloc(private_data_len, GFP_KERNEL);
 237         if (!data)
 238                 return ERR_PTR(-ENOMEM);
 239
 240         memcpy(data, private_data, private_data_len);
 241         return data;
 242 }
 243
 244 static void cm_set_private_data(struct cm_id_private *cm_id_priv,
 245                                  void *private_data, u8 private_data_len)
 246 {
 247         if (cm_id_priv->private_data && cm_id_priv->private_data_len)
 248                 kfree(cm_id_priv->private_data);
 249
 250         cm_id_priv->private_data = private_data;
 251         cm_id_priv->private_data_len = private_data_len;
 252 }
 253
 254 static void cm_set_ah_attr(struct ib_ah_attr *ah_attr, u8 port_num,
 255                            u16 dlid, u8 sl, u16 src_path_bits)
 256 {
 257         memset(ah_attr, 0, sizeof ah_attr);
 258         ah_attr->dlid = dlid;
 259         ah_attr->sl = sl;
 260         ah_attr->src_path_bits = src_path_bits;
 261         ah_attr->port_num = port_num;
 262 }
 263
 264 static void cm_init_av_for_response(struct cm_port *port,
 265                                     struct ib_wc *wc, struct cm_av *av)
 266 {
 267         av->port = port;
 268         av->pkey_index = wc->pkey_index;
 269         cm_set_ah_attr(&av->ah_attr, port->port_num, wc->slid,
 270                        wc->sl, wc->dlid_path_bits);
 271 }
 272
 273 static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av)
 274 {
 275         struct cm_device *cm_dev;
 276         struct cm_port *port = NULL;
 277         unsigned long flags;
 278         int ret;
 279         u8 p;
 280
 281         read_lock_irqsave(&cm.device_lock, flags);
 282         list_for_each_entry(cm_dev, &cm.device_list, list) {
 283                 if (!ib_find_cached_gid(cm_dev->device, &path->sgid,
 284                                         &p, NULL)) {
 285                         port = &cm_dev->port[p-1];
 286                         break;
 287                 }
 288         }
 289         read_unlock_irqrestore(&cm.device_lock, flags);
 290
 291         if (!port)
 292                 return -EINVAL;
 293
 294         ret = ib_find_cached_pkey(cm_dev->device, port->port_num,
 295                                   be16_to_cpu(path->pkey), &av->pkey_index);
 296         if (ret)
 297                 return ret;
 298
 299         av->port = port;
 300         cm_set_ah_attr(&av->ah_attr, av->port->port_num,
 301                        be16_to_cpu(path->dlid), path->sl,
 302                        be16_to_cpu(path->slid) & 0x7F);
 303         av->packet_life_time = path->packet_life_time;
 304         return 0;
 305 }
 306
 307 static int cm_alloc_id(struct cm_id_private *cm_id_priv)
 308 {
 309         unsigned long flags;
 310         int ret;
 311         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_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id;
1551         cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid;
1552         cm_id_priv->timewait_info->remote_qpn = cm_rep_get_local_qpn(rep_msg);
1553
1554         spin_lock_irqsave(&cm.lock, flags);
1555         /* Check for duplicate REP. */
1556         if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
1557                 spin_unlock_irqrestore(&cm.lock, flags);
1558                 ret = -EINVAL;
1559                 goto error;
1560         }
1561         /* Check for a stale connection. */
1562         if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) {
1563                 spin_unlock_irqrestore(&cm.lock, flags);
1564                 cm_issue_rej(work->port, work->mad_recv_wc,
1565                              IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP,
1566                              NULL, 0);
1567                 ret = -EINVAL;
1568                 goto error;
1569         }
1570         spin_unlock_irqrestore(&cm.lock, flags);
1571
1572         cm_format_rep_event(work);
1573
1574         spin_lock_irqsave(&cm_id_priv->lock, flags);
1575         switch (cm_id_priv->id.state) {
1576         case IB_CM_REQ_SENT:
1577         case IB_CM_MRA_REQ_RCVD:
1578                 break;
1579         default:
1580                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1581                 ret = -EINVAL;
1582                 goto error;
1583         }
1584         cm_id_priv->id.state = IB_CM_REP_RCVD;
1585         cm_id_priv->id.remote_id = rep_msg->local_comm_id;
1586         cm_id_priv->remote_qpn = cm_rep_get_local_qpn(rep_msg);
1587         cm_id_priv->initiator_depth = rep_msg->resp_resources;
1588         cm_id_priv->responder_resources = rep_msg->initiator_depth;
1589         cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg);
1590         cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1591
1592         /* todo: handle peer_to_peer */
1593
1594         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1595         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1596         if (!ret)
1597                 list_add_tail(&work->list, &cm_id_priv->work_list);
1598         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1599
1600         if (ret)
1601                 cm_process_work(cm_id_priv, work);
1602         else
1603                 cm_deref_id(cm_id_priv);
1604         return 0;
1605
1606 error:  cm_cleanup_timewait(cm_id_priv->timewait_info);
1607         cm_deref_id(cm_id_priv);
1608         return ret;
1609 }
1610
1611 static int cm_establish_handler(struct cm_work *work)
1612 {
1613         struct cm_id_private *cm_id_priv;
1614         unsigned long flags;
1615         int ret;
1616
1617         /* See comment in ib_cm_establish about lookup. */
1618         cm_id_priv = cm_acquire_id(work->local_id, work->remote_id);
1619         if (!cm_id_priv)
1620                 return -EINVAL;
1621
1622         spin_lock_irqsave(&cm_id_priv->lock, flags);
1623         if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
1624                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1625                 goto out;
1626         }
1627
1628         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1629         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1630         if (!ret)
1631                 list_add_tail(&work->list, &cm_id_priv->work_list);
1632         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1633
1634         if (ret)
1635                 cm_process_work(cm_id_priv, work);
1636         else
1637                 cm_deref_id(cm_id_priv);
1638         return 0;
1639 out:
1640         cm_deref_id(cm_id_priv);
1641         return -EINVAL;
1642 }
1643
1644 static int cm_rtu_handler(struct cm_work *work)
1645 {
1646         struct cm_id_private *cm_id_priv;
1647         struct cm_rtu_msg *rtu_msg;
1648         unsigned long flags;
1649         int ret;
1650
1651         rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad;
1652         cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id,
1653                                    rtu_msg->local_comm_id);
1654         if (!cm_id_priv)
1655                 return -EINVAL;
1656
1657         work->cm_event.private_data = &rtu_msg->private_data;
1658
1659         spin_lock_irqsave(&cm_id_priv->lock, flags);
1660         if (cm_id_priv->id.state != IB_CM_REP_SENT &&
1661             cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
1662                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1663                 goto out;
1664         }
1665         cm_id_priv->id.state = IB_CM_ESTABLISHED;
1666
1667         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1668         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1669         if (!ret)
1670                 list_add_tail(&work->list, &cm_id_priv->work_list);
1671         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1672
1673         if (ret)
1674                 cm_process_work(cm_id_priv, work);
1675         else
1676                 cm_deref_id(cm_id_priv);
1677         return 0;
1678 out:
1679         cm_deref_id(cm_id_priv);
1680         return -EINVAL;
1681 }
1682
1683 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg,
1684                           struct cm_id_private *cm_id_priv,
1685                           const void *private_data,
1686                           u8 private_data_len)
1687 {
1688         cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID,
1689                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ));
1690         dreq_msg->local_comm_id = cm_id_priv->id.local_id;
1691         dreq_msg->remote_comm_id = cm_id_priv->id.remote_id;
1692         cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn);
1693
1694         if (private_data && private_data_len)
1695                 memcpy(dreq_msg->private_data, private_data, private_data_len);
1696 }
1697
1698 int ib_send_cm_dreq(struct ib_cm_id *cm_id,
1699                     const void *private_data,
1700                     u8 private_data_len)
1701 {
1702         struct cm_id_private *cm_id_priv;
1703         struct ib_mad_send_buf *msg;
1704         unsigned long flags;
1705         int ret;
1706
1707         if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE)
1708                 return -EINVAL;
1709
1710         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1711         spin_lock_irqsave(&cm_id_priv->lock, flags);
1712         if (cm_id->state != IB_CM_ESTABLISHED) {
1713                 ret = -EINVAL;
1714                 goto out;
1715         }
1716
1717         ret = cm_alloc_msg(cm_id_priv, &msg);
1718         if (ret) {
1719                 cm_enter_timewait(cm_id_priv);
1720                 goto out;
1721         }
1722
1723         cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv,
1724                        private_data, private_data_len);
1725         msg->timeout_ms = cm_id_priv->timeout_ms;
1726         msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
1727
1728         ret = ib_post_send_mad(msg, NULL);
1729         if (ret) {
1730                 cm_enter_timewait(cm_id_priv);
1731                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1732                 cm_free_msg(msg);
1733                 return ret;
1734         }
1735
1736         cm_id->state = IB_CM_DREQ_SENT;
1737         cm_id_priv->msg = msg;
1738 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1739         return ret;
1740 }
1741 EXPORT_SYMBOL(ib_send_cm_dreq);
1742
1743 static void cm_format_drep(struct cm_drep_msg *drep_msg,
1744                           struct cm_id_private *cm_id_priv,
1745                           const void *private_data,
1746                           u8 private_data_len)
1747 {
1748         cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid);
1749         drep_msg->local_comm_id = cm_id_priv->id.local_id;
1750         drep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1751
1752         if (private_data && private_data_len)
1753                 memcpy(drep_msg->private_data, private_data, private_data_len);
1754 }
1755
1756 int ib_send_cm_drep(struct ib_cm_id *cm_id,
1757                     const void *private_data,
1758                     u8 private_data_len)
1759 {
1760         struct cm_id_private *cm_id_priv;
1761         struct ib_mad_send_buf *msg;
1762         unsigned long flags;
1763         void *data;
1764         int ret;
1765
1766         if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
1767                 return -EINVAL;
1768
1769         data = cm_copy_private_data(private_data, private_data_len);
1770         if (IS_ERR(data))
1771                 return PTR_ERR(data);
1772
1773         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1774         spin_lock_irqsave(&cm_id_priv->lock, flags);
1775         if (cm_id->state != IB_CM_DREQ_RCVD) {
1776                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1777                 kfree(data);
1778                 return -EINVAL;
1779         }
1780
1781         cm_set_private_data(cm_id_priv, data, private_data_len);
1782         cm_enter_timewait(cm_id_priv);
1783
1784         ret = cm_alloc_msg(cm_id_priv, &msg);
1785         if (ret)
1786                 goto out;
1787
1788         cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
1789                        private_data, private_data_len);
1790
1791         ret = ib_post_send_mad(msg, NULL);
1792         if (ret) {
1793                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1794                 cm_free_msg(msg);
1795                 return ret;
1796         }
1797
1798 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1799         return ret;
1800 }
1801 EXPORT_SYMBOL(ib_send_cm_drep);
1802
1803 static int cm_dreq_handler(struct cm_work *work)
1804 {
1805         struct cm_id_private *cm_id_priv;
1806         struct cm_dreq_msg *dreq_msg;
1807         struct ib_mad_send_buf *msg = NULL;
1808         unsigned long flags;
1809         int ret;
1810
1811         dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
1812         cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id,
1813                                    dreq_msg->local_comm_id);
1814         if (!cm_id_priv)
1815                 return -EINVAL;
1816
1817         work->cm_event.private_data = &dreq_msg->private_data;
1818
1819         spin_lock_irqsave(&cm_id_priv->lock, flags);
1820         if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg))
1821                 goto unlock;
1822
1823         switch (cm_id_priv->id.state) {
1824         case IB_CM_REP_SENT:
1825         case IB_CM_DREQ_SENT:
1826                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1827                 break;
1828         case IB_CM_ESTABLISHED:
1829         case IB_CM_MRA_REP_RCVD:
1830                 break;
1831         case IB_CM_TIMEWAIT:
1832                 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
1833                         goto unlock;
1834
1835                 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
1836                                cm_id_priv->private_data,
1837                                cm_id_priv->private_data_len);
1838                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1839
1840                 if (ib_post_send_mad(msg, NULL))
1841                         cm_free_msg(msg);
1842                 goto deref;
1843         default:
1844                 goto unlock;
1845         }
1846         cm_id_priv->id.state = IB_CM_DREQ_RCVD;
1847         cm_id_priv->tid = dreq_msg->hdr.tid;
1848         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1849         if (!ret)
1850                 list_add_tail(&work->list, &cm_id_priv->work_list);
1851         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1852
1853         if (ret)
1854                 cm_process_work(cm_id_priv, work);
1855         else
1856                 cm_deref_id(cm_id_priv);
1857         return 0;
1858
1859 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1860 deref:  cm_deref_id(cm_id_priv);
1861         return -EINVAL;
1862 }
1863
1864 static int cm_drep_handler(struct cm_work *work)
1865 {
1866         struct cm_id_private *cm_id_priv;
1867         struct cm_drep_msg *drep_msg;
1868         unsigned long flags;
1869         int ret;
1870
1871         drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
1872         cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id,
1873                                    drep_msg->local_comm_id);
1874         if (!cm_id_priv)
1875                 return -EINVAL;
1876
1877         work->cm_event.private_data = &drep_msg->private_data;
1878
1879         spin_lock_irqsave(&cm_id_priv->lock, flags);
1880         if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
1881             cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
1882                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1883                 goto out;
1884         }
1885         cm_enter_timewait(cm_id_priv);
1886
1887         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1888         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1889         if (!ret)
1890                 list_add_tail(&work->list, &cm_id_priv->work_list);
1891         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1892
1893         if (ret)
1894                 cm_process_work(cm_id_priv, work);
1895         else
1896                 cm_deref_id(cm_id_priv);
1897         return 0;
1898 out:
1899         cm_deref_id(cm_id_priv);
1900         return -EINVAL;
1901 }
1902
1903 int ib_send_cm_rej(struct ib_cm_id *cm_id,
1904                    enum ib_cm_rej_reason reason,
1905                    void *ari,
1906                    u8 ari_length,
1907                    const void *private_data,
1908                    u8 private_data_len)
1909 {
1910         struct cm_id_private *cm_id_priv;
1911         struct ib_mad_send_buf *msg;
1912         unsigned long flags;
1913         int ret;
1914
1915         if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
1916             (ari && ari_length > IB_CM_REJ_ARI_LENGTH))
1917                 return -EINVAL;
1918
1919         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1920
1921         spin_lock_irqsave(&cm_id_priv->lock, flags);
1922         switch (cm_id->state) {
1923         case IB_CM_REQ_SENT:
1924         case IB_CM_MRA_REQ_RCVD:
1925         case IB_CM_REQ_RCVD:
1926         case IB_CM_MRA_REQ_SENT:
1927         case IB_CM_REP_RCVD:
1928         case IB_CM_MRA_REP_SENT:
1929                 ret = cm_alloc_msg(cm_id_priv, &msg);
1930                 if (!ret)
1931                         cm_format_rej((struct cm_rej_msg *) msg->mad,
1932                                       cm_id_priv, reason, ari, ari_length,
1933                                       private_data, private_data_len);
1934
1935                 cm_reset_to_idle(cm_id_priv);
1936                 break;
1937         case IB_CM_REP_SENT:
1938         case IB_CM_MRA_REP_RCVD:
1939                 ret = cm_alloc_msg(cm_id_priv, &msg);
1940                 if (!ret)
1941                         cm_format_rej((struct cm_rej_msg *) msg->mad,
1942                                       cm_id_priv, reason, ari, ari_length,
1943                                       private_data, private_data_len);
1944
1945                 cm_enter_timewait(cm_id_priv);
1946                 break;
1947         default:
1948                 ret = -EINVAL;
1949                 goto out;
1950         }
1951
1952         if (ret)
1953                 goto out;
1954
1955         ret = ib_post_send_mad(msg, NULL);
1956         if (ret)
1957                 cm_free_msg(msg);
1958
1959 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1960         return ret;
1961 }
1962 EXPORT_SYMBOL(ib_send_cm_rej);
1963
1964 static void cm_format_rej_event(struct cm_work *work)
1965 {
1966         struct cm_rej_msg *rej_msg;
1967         struct ib_cm_rej_event_param *param;
1968
1969         rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
1970         param = &work->cm_event.param.rej_rcvd;
1971         param->ari = rej_msg->ari;
1972         param->ari_length = cm_rej_get_reject_info_len(rej_msg);
1973         param->reason = __be16_to_cpu(rej_msg->reason);
1974         work->cm_event.private_data = &rej_msg->private_data;
1975 }
1976
1977 static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
1978 {
1979         struct cm_timewait_info *timewait_info;
1980         struct cm_id_private *cm_id_priv;
1981         unsigned long flags;
1982         __be32 remote_id;
1983
1984         remote_id = rej_msg->local_comm_id;
1985
1986         if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) {
1987                 spin_lock_irqsave(&cm.lock, flags);
1988                 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari),
1989                                                   remote_id);
1990                 if (!timewait_info) {
1991                         spin_unlock_irqrestore(&cm.lock, flags);
1992                         return NULL;
1993                 }
1994                 cm_id_priv = idr_find(&cm.local_id_table,
1995                                       (__force int) timewait_info->work.local_id);
1996                 if (cm_id_priv) {
1997                         if (cm_id_priv->id.remote_id == remote_id)
1998                                 atomic_inc(&cm_id_priv->refcount);
1999                         else
2000                                 cm_id_priv = NULL;
2001                 }
2002                 spin_unlock_irqrestore(&cm.lock, flags);
2003         } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ)
2004                 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0);
2005         else
2006                 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id);
2007
2008         return cm_id_priv;
2009 }
2010
2011 static int cm_rej_handler(struct cm_work *work)
2012 {
2013         struct cm_id_private *cm_id_priv;
2014         struct cm_rej_msg *rej_msg;
2015         unsigned long flags;
2016         int ret;
2017
2018         rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2019         cm_id_priv = cm_acquire_rejected_id(rej_msg);
2020         if (!cm_id_priv)
2021                 return -EINVAL;
2022
2023         cm_format_rej_event(work);
2024
2025         spin_lock_irqsave(&cm_id_priv->lock, flags);
2026         switch (cm_id_priv->id.state) {
2027         case IB_CM_REQ_SENT:
2028         case IB_CM_MRA_REQ_RCVD:
2029         case IB_CM_REP_SENT:
2030         case IB_CM_MRA_REP_RCVD:
2031                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2032                 /* fall through */
2033         case IB_CM_REQ_RCVD:
2034         case IB_CM_MRA_REQ_SENT:
2035                 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN)
2036                         cm_enter_timewait(cm_id_priv);
2037                 else
2038                         cm_reset_to_idle(cm_id_priv);
2039                 break;
2040         case IB_CM_DREQ_SENT:
2041                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2042                 /* fall through */
2043         case IB_CM_REP_RCVD:
2044         case IB_CM_MRA_REP_SENT:
2045         case IB_CM_ESTABLISHED:
2046                 cm_enter_timewait(cm_id_priv);
2047                 break;
2048         default:
2049                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2050                 ret = -EINVAL;
2051                 goto out;
2052         }
2053
2054         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2055         if (!ret)
2056                 list_add_tail(&work->list, &cm_id_priv->work_list);
2057         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2058
2059         if (ret)
2060                 cm_process_work(cm_id_priv, work);
2061         else
2062                 cm_deref_id(cm_id_priv);
2063         return 0;
2064 out:
2065         cm_deref_id(cm_id_priv);
2066         return -EINVAL;
2067 }
2068
2069 int ib_send_cm_mra(struct ib_cm_id *cm_id,
2070                    u8 service_timeout,
2071                    const void *private_data,
2072                    u8 private_data_len)
2073 {
2074         struct cm_id_private *cm_id_priv;
2075         struct ib_mad_send_buf *msg;
2076         void *data;
2077         unsigned long flags;
2078         int ret;
2079
2080         if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE)
2081                 return -EINVAL;
2082
2083         data = cm_copy_private_data(private_data, private_data_len);
2084         if (IS_ERR(data))
2085                 return PTR_ERR(data);
2086
2087         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2088
2089         spin_lock_irqsave(&cm_id_priv->lock, flags);
2090         switch(cm_id_priv->id.state) {
2091         case IB_CM_REQ_RCVD:
2092                 ret = cm_alloc_msg(cm_id_priv, &msg);
2093                 if (ret)
2094                         goto error1;
2095
2096                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2097                               CM_MSG_RESPONSE_REQ, service_timeout,
2098                               private_data, private_data_len);
2099                 ret = ib_post_send_mad(msg, NULL);
2100                 if (ret)
2101                         goto error2;
2102                 cm_id->state = IB_CM_MRA_REQ_SENT;
2103                 break;
2104         case IB_CM_REP_RCVD:
2105                 ret = cm_alloc_msg(cm_id_priv, &msg);
2106                 if (ret)
2107                         goto error1;
2108
2109                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2110                               CM_MSG_RESPONSE_REP, service_timeout,
2111                               private_data, private_data_len);
2112                 ret = ib_post_send_mad(msg, NULL);
2113                 if (ret)
2114                         goto error2;
2115                 cm_id->state = IB_CM_MRA_REP_SENT;
2116                 break;
2117         case IB_CM_ESTABLISHED:
2118                 ret = cm_alloc_msg(cm_id_priv, &msg);
2119                 if (ret)
2120                         goto error1;
2121
2122                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2123                               CM_MSG_RESPONSE_OTHER, service_timeout,
2124                               private_data, private_data_len);
2125                 ret = ib_post_send_mad(msg, NULL);
2126                 if (ret)
2127                         goto error2;
2128                 cm_id->lap_state = IB_CM_MRA_LAP_SENT;
2129                 break;
2130         default:
2131                 ret = -EINVAL;
2132                 goto error1;
2133         }
2134         cm_id_priv->service_timeout = service_timeout;
2135         cm_set_private_data(cm_id_priv, data, private_data_len);
2136         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2137         return 0;
2138
2139 error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2140         kfree(data);
2141         return ret;
2142
2143 error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2144         kfree(data);
2145         cm_free_msg(msg);
2146         return ret;
2147 }
2148 EXPORT_SYMBOL(ib_send_cm_mra);
2149
2150 static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
2151 {
2152         switch (cm_mra_get_msg_mraed(mra_msg)) {
2153         case CM_MSG_RESPONSE_REQ:
2154                 return cm_acquire_id(mra_msg->remote_comm_id, 0);
2155         case CM_MSG_RESPONSE_REP:
2156         case CM_MSG_RESPONSE_OTHER:
2157                 return cm_acquire_id(mra_msg->remote_comm_id,
2158                                      mra_msg->local_comm_id);
2159         default:
2160                 return NULL;
2161         }
2162 }
2163
2164 static int cm_mra_handler(struct cm_work *work)
2165 {
2166         struct cm_id_private *cm_id_priv;
2167         struct cm_mra_msg *mra_msg;
2168         unsigned long flags;
2169         int timeout, ret;
2170
2171         mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
2172         cm_id_priv = cm_acquire_mraed_id(mra_msg);
2173         if (!cm_id_priv)
2174                 return -EINVAL;
2175
2176         work->cm_event.private_data = &mra_msg->private_data;
2177         work->cm_event.param.mra_rcvd.service_timeout =
2178                                         cm_mra_get_service_timeout(mra_msg);
2179         timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) +
2180                   cm_convert_to_ms(cm_id_priv->av.packet_life_time);
2181
2182         spin_lock_irqsave(&cm_id_priv->lock, flags);
2183         switch (cm_id_priv->id.state) {
2184         case IB_CM_REQ_SENT:
2185                 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ ||
2186                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
2187                                   cm_id_priv->msg, timeout))
2188                         goto out;
2189                 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
2190                 break;
2191         case IB_CM_REP_SENT:
2192                 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP ||
2193                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
2194                                   cm_id_priv->msg, timeout))
2195                         goto out;
2196                 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
2197                 break;
2198         case IB_CM_ESTABLISHED:
2199                 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER ||
2200                     cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
2201                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
2202                                   cm_id_priv->msg, timeout))
2203                         goto out;
2204                 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
2205                 break;
2206         default:
2207                 goto out;
2208         }
2209
2210         cm_id_priv->msg->context[1] = (void *) (unsigned long)
2211                                       cm_id_priv->id.state;
2212         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2213         if (!ret)
2214                 list_add_tail(&work->list, &cm_id_priv->work_list);
2215         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2216
2217         if (ret)
2218                 cm_process_work(cm_id_priv, work);
2219         else
2220                 cm_deref_id(cm_id_priv);
2221         return 0;
2222 out:
2223         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2224         cm_deref_id(cm_id_priv);
2225         return -EINVAL;
2226 }
2227
2228 static void cm_format_lap(struct cm_lap_msg *lap_msg,
2229                           struct cm_id_private *cm_id_priv,
2230                           struct ib_sa_path_rec *alternate_path,
2231                           const void *private_data,
2232                           u8 private_data_len)
2233 {
2234         cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID,
2235                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP));
2236         lap_msg->local_comm_id = cm_id_priv->id.local_id;
2237         lap_msg->remote_comm_id = cm_id_priv->id.remote_id;
2238         cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn);
2239         /* todo: need remote CM response timeout */
2240         cm_lap_set_remote_resp_timeout(lap_msg, 0x1F);
2241         lap_msg->alt_local_lid = alternate_path->slid;
2242         lap_msg->alt_remote_lid = alternate_path->dlid;
2243         lap_msg->alt_local_gid = alternate_path->sgid;
2244         lap_msg->alt_remote_gid = alternate_path->dgid;
2245         cm_lap_set_flow_label(lap_msg, alternate_path->flow_label);
2246         cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class);
2247         lap_msg->alt_hop_limit = alternate_path->hop_limit;
2248         cm_lap_set_packet_rate(lap_msg, alternate_path->rate);
2249         cm_lap_set_sl(lap_msg, alternate_path->sl);
2250         cm_lap_set_subnet_local(lap_msg, 1); /* local only... */
2251         cm_lap_set_local_ack_timeout(lap_msg,
2252                 min(31, alternate_path->packet_life_time + 1));
2253
2254         if (private_data && private_data_len)
2255                 memcpy(lap_msg->private_data, private_data, private_data_len);
2256 }
2257
2258 int ib_send_cm_lap(struct ib_cm_id *cm_id,
2259                    struct ib_sa_path_rec *alternate_path,
2260                    const void *private_data,
2261                    u8 private_data_len)
2262 {
2263         struct cm_id_private *cm_id_priv;
2264         struct ib_mad_send_buf *msg;
2265         unsigned long flags;
2266         int ret;
2267
2268         if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE)
2269                 return -EINVAL;
2270
2271         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2272         spin_lock_irqsave(&cm_id_priv->lock, flags);
2273         if (cm_id->state != IB_CM_ESTABLISHED ||
2274             cm_id->lap_state != IB_CM_LAP_IDLE) {
2275                 ret = -EINVAL;
2276                 goto out;
2277         }
2278
2279         ret = cm_alloc_msg(cm_id_priv, &msg);
2280         if (ret)
2281                 goto out;
2282
2283         cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv,
2284                       alternate_path, private_data, private_data_len);
2285         msg->timeout_ms = cm_id_priv->timeout_ms;
2286         msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED;
2287
2288         ret = ib_post_send_mad(msg, NULL);
2289         if (ret) {
2290                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2291                 cm_free_msg(msg);
2292                 return ret;
2293         }
2294
2295         cm_id->lap_state = IB_CM_LAP_SENT;
2296         cm_id_priv->msg = msg;
2297
2298 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2299         return ret;
2300 }
2301 EXPORT_SYMBOL(ib_send_cm_lap);
2302
2303 static void cm_format_path_from_lap(struct ib_sa_path_rec *path,
2304                                     struct cm_lap_msg *lap_msg)
2305 {
2306         memset(path, 0, sizeof *path);
2307         path->dgid = lap_msg->alt_local_gid;
2308         path->sgid = lap_msg->alt_remote_gid;
2309         path->dlid = lap_msg->alt_local_lid;
2310         path->slid = lap_msg->alt_remote_lid;
2311         path->flow_label = cm_lap_get_flow_label(lap_msg);
2312         path->hop_limit = lap_msg->alt_hop_limit;
2313         path->traffic_class = cm_lap_get_traffic_class(lap_msg);
2314         path->reversible = 1;
2315         /* pkey is same as in REQ */
2316         path->sl = cm_lap_get_sl(lap_msg);
2317         path->mtu_selector = IB_SA_EQ;
2318         /* mtu is same as in REQ */
2319         path->rate_selector = IB_SA_EQ;
2320         path->rate = cm_lap_get_packet_rate(lap_msg);
2321         path->packet_life_time_selector = IB_SA_EQ;
2322         path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg);
2323         path->packet_life_time -= (path->packet_life_time > 0);
2324 }
2325
2326 static int cm_lap_handler(struct cm_work *work)
2327 {
2328         struct cm_id_private *cm_id_priv;
2329         struct cm_lap_msg *lap_msg;
2330         struct ib_cm_lap_event_param *param;
2331         struct ib_mad_send_buf *msg = NULL;
2332         unsigned long flags;
2333         int ret;
2334
2335         /* todo: verify LAP request and send reject APR if invalid. */
2336         lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
2337         cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id,
2338                                    lap_msg->local_comm_id);
2339         if (!cm_id_priv)
2340                 return -EINVAL;
2341
2342         param = &work->cm_event.param.lap_rcvd;
2343         param->alternate_path = &work->path[0];
2344         cm_format_path_from_lap(param->alternate_path, lap_msg);
2345         work->cm_event.private_data = &lap_msg->private_data;
2346
2347         spin_lock_irqsave(&cm_id_priv->lock, flags);
2348         if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
2349                 goto unlock;
2350
2351         switch (cm_id_priv->id.lap_state) {
2352         case IB_CM_LAP_IDLE:
2353                 break;
2354         case IB_CM_MRA_LAP_SENT:
2355                 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2356                         goto unlock;
2357
2358                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2359                               CM_MSG_RESPONSE_OTHER,
2360                               cm_id_priv->service_timeout,
2361                               cm_id_priv->private_data,
2362                               cm_id_priv->private_data_len);
2363                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2364
2365                 if (ib_post_send_mad(msg, NULL))
2366                         cm_free_msg(msg);
2367                 goto deref;
2368         default:
2369                 goto unlock;
2370         }
2371
2372         cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
2373         cm_id_priv->tid = lap_msg->hdr.tid;
2374         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2375         if (!ret)
2376                 list_add_tail(&work->list, &cm_id_priv->work_list);
2377         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2378
2379         if (ret)
2380                 cm_process_work(cm_id_priv, work);
2381         else
2382                 cm_deref_id(cm_id_priv);
2383         return 0;
2384
2385 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2386 deref:  cm_deref_id(cm_id_priv);
2387         return -EINVAL;
2388 }
2389
2390 static void cm_format_apr(struct cm_apr_msg *apr_msg,
2391                           struct cm_id_private *cm_id_priv,
2392                           enum ib_cm_apr_status status,
2393                           void *info,
2394                           u8 info_length,
2395                           const void *private_data,
2396                           u8 private_data_len)
2397 {
2398         cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid);
2399         apr_msg->local_comm_id = cm_id_priv->id.local_id;
2400         apr_msg->remote_comm_id = cm_id_priv->id.remote_id;
2401         apr_msg->ap_status = (u8) status;
2402
2403         if (info && info_length) {
2404                 apr_msg->info_length = info_length;
2405                 memcpy(apr_msg->info, info, info_length);
2406         }
2407
2408         if (private_data && private_data_len)
2409                 memcpy(apr_msg->private_data, private_data, private_data_len);
2410 }
2411
2412 int ib_send_cm_apr(struct ib_cm_id *cm_id,
2413                    enum ib_cm_apr_status status,
2414                    void *info,
2415                    u8 info_length,
2416                    const void *private_data,
2417                    u8 private_data_len)
2418 {
2419         struct cm_id_private *cm_id_priv;
2420         struct ib_mad_send_buf *msg;
2421         unsigned long flags;
2422         int ret;
2423
2424         if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) ||
2425             (info && info_length > IB_CM_APR_INFO_LENGTH))
2426                 return -EINVAL;
2427
2428         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2429         spin_lock_irqsave(&cm_id_priv->lock, flags);
2430         if (cm_id->state != IB_CM_ESTABLISHED ||
2431             (cm_id->lap_state != IB_CM_LAP_RCVD &&
2432              cm_id->lap_state != IB_CM_MRA_LAP_SENT)) {
2433                 ret = -EINVAL;
2434                 goto out;
2435         }
2436
2437         ret = cm_alloc_msg(cm_id_priv, &msg);
2438         if (ret)
2439                 goto out;
2440
2441         cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status,
2442                       info, info_length, private_data, private_data_len);
2443         ret = ib_post_send_mad(msg, NULL);
2444         if (ret) {
2445                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2446                 cm_free_msg(msg);
2447                 return ret;
2448         }
2449
2450         cm_id->lap_state = IB_CM_LAP_IDLE;
2451 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2452         return ret;
2453 }
2454 EXPORT_SYMBOL(ib_send_cm_apr);
2455
2456 static int cm_apr_handler(struct cm_work *work)
2457 {
2458         struct cm_id_private *cm_id_priv;
2459         struct cm_apr_msg *apr_msg;
2460         unsigned long flags;
2461         int ret;
2462
2463         apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
2464         cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id,
2465                                    apr_msg->local_comm_id);
2466         if (!cm_id_priv)
2467                 return -EINVAL; /* Unmatched reply. */
2468
2469         work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status;
2470         work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info;
2471         work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length;
2472         work->cm_event.private_data = &apr_msg->private_data;
2473
2474         spin_lock_irqsave(&cm_id_priv->lock, flags);
2475         if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
2476             (cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
2477              cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
2478                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2479                 goto out;
2480         }
2481         cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
2482         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2483         cm_id_priv->msg = NULL;
2484
2485         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2486         if (!ret)
2487                 list_add_tail(&work->list, &cm_id_priv->work_list);
2488         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2489
2490         if (ret)
2491                 cm_process_work(cm_id_priv, work);
2492         else
2493                 cm_deref_id(cm_id_priv);
2494         return 0;
2495 out:
2496         cm_deref_id(cm_id_priv);
2497         return -EINVAL;
2498 }
2499
2500 static int cm_timewait_handler(struct cm_work *work)
2501 {
2502         struct cm_timewait_info *timewait_info;
2503         struct cm_id_private *cm_id_priv;
2504         unsigned long flags;
2505         int ret;
2506
2507         timewait_info = (struct cm_timewait_info *)work;
2508         cm_cleanup_timewait(timewait_info);
2509
2510         cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
2511                                    timewait_info->work.remote_id);
2512         if (!cm_id_priv)
2513                 return -EINVAL;
2514
2515         spin_lock_irqsave(&cm_id_priv->lock, flags);
2516         if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
2517             cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
2518                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2519                 goto out;
2520         }
2521         cm_id_priv->id.state = IB_CM_IDLE;
2522         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2523         if (!ret)
2524                 list_add_tail(&work->list, &cm_id_priv->work_list);
2525         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2526
2527         if (ret)
2528                 cm_process_work(cm_id_priv, work);
2529         else
2530                 cm_deref_id(cm_id_priv);
2531         return 0;
2532 out:
2533         cm_deref_id(cm_id_priv);
2534         return -EINVAL;
2535 }
2536
2537 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
2538                                struct cm_id_private *cm_id_priv,
2539                                struct ib_cm_sidr_req_param *param)
2540 {
2541         cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
2542                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR));
2543         sidr_req_msg->request_id = cm_id_priv->id.local_id;
2544         sidr_req_msg->pkey = cpu_to_be16(param->pkey);
2545         sidr_req_msg->service_id = param->service_id;
2546
2547         if (param->private_data && param->private_data_len)
2548                 memcpy(sidr_req_msg->private_data, param->private_data,
2549                        param->private_data_len);
2550 }
2551
2552 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
2553                         struct ib_cm_sidr_req_param *param)
2554 {
2555         struct cm_id_private *cm_id_priv;
2556         struct ib_mad_send_buf *msg;
2557         unsigned long flags;
2558         int ret;
2559
2560         if (!param->path || (param->private_data &&
2561              param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
2562                 return -EINVAL;
2563
2564         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2565         ret = cm_init_av_by_path(param->path, &cm_id_priv->av);
2566         if (ret)
2567                 goto out;
2568
2569         cm_id->service_id = param->service_id;
2570         cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
2571         cm_id_priv->timeout_ms = param->timeout_ms;
2572         cm_id_priv->max_cm_retries = param->max_cm_retries;
2573         ret = cm_alloc_msg(cm_id_priv, &msg);
2574         if (ret)
2575                 goto out;
2576
2577         cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv,
2578                            param);
2579         msg->timeout_ms = cm_id_priv->timeout_ms;
2580         msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT;
2581
2582         spin_lock_irqsave(&cm_id_priv->lock, flags);
2583         if (cm_id->state == IB_CM_IDLE)
2584                 ret = ib_post_send_mad(msg, NULL);
2585         else
2586                 ret = -EINVAL;
2587
2588         if (ret) {
2589                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2590                 cm_free_msg(msg);
2591                 goto out;
2592         }
2593         cm_id->state = IB_CM_SIDR_REQ_SENT;
2594         cm_id_priv->msg = msg;
2595         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2596 out:
2597         return ret;
2598 }
2599 EXPORT_SYMBOL(ib_send_cm_sidr_req);
2600
2601 static void cm_format_sidr_req_event(struct cm_work *work,
2602                                      struct ib_cm_id *listen_id)
2603 {
2604         struct cm_sidr_req_msg *sidr_req_msg;
2605         struct ib_cm_sidr_req_event_param *param;
2606
2607         sidr_req_msg = (struct cm_sidr_req_msg *)
2608                                 work->mad_recv_wc->recv_buf.mad;
2609         param = &work->cm_event.param.sidr_req_rcvd;
2610         param->pkey = __be16_to_cpu(sidr_req_msg->pkey);
2611         param->listen_id = listen_id;
2612         param->port = work->port->port_num;
2613         work->cm_event.private_data = &sidr_req_msg->private_data;
2614 }
2615
2616 static int cm_sidr_req_handler(struct cm_work *work)
2617 {
2618         struct ib_cm_id *cm_id;
2619         struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
2620         struct cm_sidr_req_msg *sidr_req_msg;
2621         struct ib_wc *wc;
2622         unsigned long flags;
2623
2624         cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL);
2625         if (IS_ERR(cm_id))
2626                 return PTR_ERR(cm_id);
2627         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2628
2629         /* Record SGID/SLID and request ID for lookup. */
2630         sidr_req_msg = (struct cm_sidr_req_msg *)
2631                                 work->mad_recv_wc->recv_buf.mad;
2632         wc = work->mad_recv_wc->wc;
2633         cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid);
2634         cm_id_priv->av.dgid.global.interface_id = 0;
2635         cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2636                                 &cm_id_priv->av);
2637         cm_id_priv->id.remote_id = sidr_req_msg->request_id;
2638         cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
2639         cm_id_priv->tid = sidr_req_msg->hdr.tid;
2640         atomic_inc(&cm_id_priv->work_count);
2641
2642         spin_lock_irqsave(&cm.lock, flags);
2643         cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
2644         if (cur_cm_id_priv) {
2645                 spin_unlock_irqrestore(&cm.lock, flags);
2646                 goto out; /* Duplicate message. */
2647         }
2648         cur_cm_id_priv = cm_find_listen(cm_id->device,
2649                                         sidr_req_msg->service_id);
2650         if (!cur_cm_id_priv) {
2651                 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
2652                 spin_unlock_irqrestore(&cm.lock, flags);
2653                 /* todo: reply with no match */
2654                 goto out; /* No match. */
2655         }
2656         atomic_inc(&cur_cm_id_priv->refcount);
2657         spin_unlock_irqrestore(&cm.lock, flags);
2658
2659         cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler;
2660         cm_id_priv->id.context = cur_cm_id_priv->id.context;
2661         cm_id_priv->id.service_id = sidr_req_msg->service_id;
2662         cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL);
2663
2664         cm_format_sidr_req_event(work, &cur_cm_id_priv->id);
2665         cm_process_work(cm_id_priv, work);
2666         cm_deref_id(cur_cm_id_priv);
2667         return 0;
2668 out:
2669         ib_destroy_cm_id(&cm_id_priv->id);
2670         return -EINVAL;
2671 }
2672
2673 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
2674                                struct cm_id_private *cm_id_priv,
2675                                struct ib_cm_sidr_rep_param *param)
2676 {
2677         cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
2678                           cm_id_priv->tid);
2679         sidr_rep_msg->request_id = cm_id_priv->id.remote_id;
2680         sidr_rep_msg->status = param->status;
2681         cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num));
2682         sidr_rep_msg->service_id = cm_id_priv->id.service_id;
2683         sidr_rep_msg->qkey = cpu_to_be32(param->qkey);
2684
2685         if (param->info && param->info_length)
2686                 memcpy(sidr_rep_msg->info, param->info, param->info_length);
2687
2688         if (param->private_data && param->private_data_len)
2689                 memcpy(sidr_rep_msg->private_data, param->private_data,
2690                        param->private_data_len);
2691 }
2692
2693 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
2694                         struct ib_cm_sidr_rep_param *param)
2695 {
2696         struct cm_id_private *cm_id_priv;
2697         struct ib_mad_send_buf *msg;
2698         unsigned long flags;
2699         int ret;
2700
2701         if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
2702             (param->private_data &&
2703              param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE))
2704                 return -EINVAL;
2705
2706         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2707         spin_lock_irqsave(&cm_id_priv->lock, flags);
2708         if (cm_id->state != IB_CM_SIDR_REQ_RCVD) {
2709                 ret = -EINVAL;
2710                 goto error;
2711         }
2712
2713         ret = cm_alloc_msg(cm_id_priv, &msg);
2714         if (ret)
2715                 goto error;
2716
2717         cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
2718                            param);
2719         ret = ib_post_send_mad(msg, NULL);
2720         if (ret) {
2721                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2722                 cm_free_msg(msg);
2723                 return ret;
2724         }
2725         cm_id->state = IB_CM_IDLE;
2726         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2727
2728         spin_lock_irqsave(&cm.lock, flags);
2729         rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
2730         spin_unlock_irqrestore(&cm.lock, flags);
2731         return 0;
2732
2733 error:  spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2734         return ret;
2735 }
2736 EXPORT_SYMBOL(ib_send_cm_sidr_rep);
2737
2738 static void cm_format_sidr_rep_event(struct cm_work *work)
2739 {
2740         struct cm_sidr_rep_msg *sidr_rep_msg;
2741         struct ib_cm_sidr_rep_event_param *param;
2742
2743         sidr_rep_msg = (struct cm_sidr_rep_msg *)
2744                                 work->mad_recv_wc->recv_buf.mad;
2745         param = &work->cm_event.param.sidr_rep_rcvd;
2746         param->status = sidr_rep_msg->status;
2747         param->qkey = be32_to_cpu(sidr_rep_msg->qkey);
2748         param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg));
2749         param->info = &sidr_rep_msg->info;
2750         param->info_len = sidr_rep_msg->info_length;
2751         work->cm_event.private_data = &sidr_rep_msg->private_data;
2752 }
2753
2754 static int cm_sidr_rep_handler(struct cm_work *work)
2755 {
2756         struct cm_sidr_rep_msg *sidr_rep_msg;
2757         struct cm_id_private *cm_id_priv;
2758         unsigned long flags;
2759
2760         sidr_rep_msg = (struct cm_sidr_rep_msg *)
2761                                 work->mad_recv_wc->recv_buf.mad;
2762         cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0);
2763         if (!cm_id_priv)
2764                 return -EINVAL; /* Unmatched reply. */
2765
2766         spin_lock_irqsave(&cm_id_priv->lock, flags);
2767         if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
2768                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2769                 goto out;
2770         }
2771         cm_id_priv->id.state = IB_CM_IDLE;
2772         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2773         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2774
2775         cm_format_sidr_rep_event(work);
2776         cm_process_work(cm_id_priv, work);
2777         return 0;
2778 out:
2779         cm_deref_id(cm_id_priv);
2780         return -EINVAL;
2781 }
2782
2783 static void cm_process_send_error(struct ib_mad_send_buf *msg,
2784                                   enum ib_wc_status wc_status)
2785 {
2786         struct cm_id_private *cm_id_priv;
2787         struct ib_cm_event cm_event;
2788         enum ib_cm_state state;
2789         unsigned long flags;
2790         int ret;
2791
2792         memset(&cm_event, 0, sizeof cm_event);
2793         cm_id_priv = msg->context[0];
2794
2795         /* Discard old sends or ones without a response. */
2796         spin_lock_irqsave(&cm_id_priv->lock, flags);
2797         state = (enum ib_cm_state) (unsigned long) msg->context[1];
2798         if (msg != cm_id_priv->msg || state != cm_id_priv->id.state)
2799                 goto discard;
2800
2801         switch (state) {
2802         case IB_CM_REQ_SENT:
2803         case IB_CM_MRA_REQ_RCVD:
2804                 cm_reset_to_idle(cm_id_priv);
2805                 cm_event.event = IB_CM_REQ_ERROR;
2806                 break;
2807         case IB_CM_REP_SENT:
2808         case IB_CM_MRA_REP_RCVD:
2809                 cm_reset_to_idle(cm_id_priv);
2810                 cm_event.event = IB_CM_REP_ERROR;
2811                 break;
2812         case IB_CM_DREQ_SENT:
2813                 cm_enter_timewait(cm_id_priv);
2814                 cm_event.event = IB_CM_DREQ_ERROR;
2815                 break;
2816         case IB_CM_SIDR_REQ_SENT:
2817                 cm_id_priv->id.state = IB_CM_IDLE;
2818                 cm_event.event = IB_CM_SIDR_REQ_ERROR;
2819                 break;
2820         default:
2821                 goto discard;
2822         }
2823         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2824         cm_event.param.send_status = wc_status;
2825
2826         /* No other events can occur on the cm_id at this point. */
2827         ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
2828         cm_free_msg(msg);
2829         if (ret)
2830                 ib_destroy_cm_id(&cm_id_priv->id);
2831         return;
2832 discard:
2833         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2834         cm_free_msg(msg);
2835 }
2836
2837 static void cm_send_handler(struct ib_mad_agent *mad_agent,
2838                             struct ib_mad_send_wc *mad_send_wc)
2839 {
2840         struct ib_mad_send_buf *msg = mad_send_wc->send_buf;
2841
2842         switch (mad_send_wc->status) {
2843         case IB_WC_SUCCESS:
2844         case IB_WC_WR_FLUSH_ERR:
2845                 cm_free_msg(msg);
2846                 break;
2847         default:
2848                 if (msg->context[0] && msg->context[1])
2849                         cm_process_send_error(msg, mad_send_wc->status);
2850                 else
2851                         cm_free_msg(msg);
2852                 break;
2853         }
2854 }
2855
2856 static void cm_work_handler(void *data)
2857 {
2858         struct cm_work *work = data;
2859         int ret;
2860
2861         switch (work->cm_event.event) {
2862         case IB_CM_REQ_RECEIVED:
2863                 ret = cm_req_handler(work);
2864                 break;
2865         case IB_CM_MRA_RECEIVED:
2866                 ret = cm_mra_handler(work);
2867                 break;
2868         case IB_CM_REJ_RECEIVED:
2869                 ret = cm_rej_handler(work);
2870                 break;
2871         case IB_CM_REP_RECEIVED:
2872                 ret = cm_rep_handler(work);
2873                 break;
2874         case IB_CM_RTU_RECEIVED:
2875                 ret = cm_rtu_handler(work);
2876                 break;
2877         case IB_CM_USER_ESTABLISHED:
2878                 ret = cm_establish_handler(work);
2879                 break;
2880         case IB_CM_DREQ_RECEIVED:
2881                 ret = cm_dreq_handler(work);
2882                 break;
2883         case IB_CM_DREP_RECEIVED:
2884                 ret = cm_drep_handler(work);
2885                 break;
2886         case IB_CM_SIDR_REQ_RECEIVED:
2887                 ret = cm_sidr_req_handler(work);
2888                 break;
2889         case IB_CM_SIDR_REP_RECEIVED:
2890                 ret = cm_sidr_rep_handler(work);
2891                 break;
2892         case IB_CM_LAP_RECEIVED:
2893                 ret = cm_lap_handler(work);
2894                 break;
2895         case IB_CM_APR_RECEIVED:
2896                 ret = cm_apr_handler(work);
2897                 break;
2898         case IB_CM_TIMEWAIT_EXIT:
2899                 ret = cm_timewait_handler(work);
2900                 break;
2901         default:
2902                 ret = -EINVAL;
2903                 break;
2904         }
2905         if (ret)
2906                 cm_free_work(work);
2907 }
2908
2909 int ib_cm_establish(struct ib_cm_id *cm_id)
2910 {
2911         struct cm_id_private *cm_id_priv;
2912         struct cm_work *work;
2913         unsigned long flags;
2914         int ret = 0;
2915
2916         work = kmalloc(sizeof *work, GFP_ATOMIC);
2917         if (!work)
2918                 return -ENOMEM;
2919
2920         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2921         spin_lock_irqsave(&cm_id_priv->lock, flags);
2922         switch (cm_id->state)
2923         {
2924         case IB_CM_REP_SENT:
2925         case IB_CM_MRA_REP_RCVD:
2926                 cm_id->state = IB_CM_ESTABLISHED;
2927                 break;
2928         case IB_CM_ESTABLISHED:
2929                 ret = -EISCONN;
2930                 break;
2931         default:
2932                 ret = -EINVAL;
2933                 break;
2934         }
2935         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2936
2937         if (ret) {
2938                 kfree(work);
2939                 goto out;
2940         }
2941
2942         /*
2943          * The CM worker thread may try to destroy the cm_id before it
2944          * can execute this work item.  To prevent potential deadlock,
2945          * we need to find the cm_id once we're in the context of the
2946          * worker thread, rather than holding a reference on it.
2947          */
2948         INIT_WORK(&work->work, cm_work_handler, work);
2949         work->local_id = cm_id->local_id;
2950         work->remote_id = cm_id->remote_id;
2951         work->mad_recv_wc = NULL;
2952         work->cm_event.event = IB_CM_USER_ESTABLISHED;
2953         queue_work(cm.wq, &work->work);
2954 out:
2955         return ret;
2956 }
2957 EXPORT_SYMBOL(ib_cm_establish);
2958
2959 static void cm_recv_handler(struct ib_mad_agent *mad_agent,
2960                             struct ib_mad_recv_wc *mad_recv_wc)
2961 {
2962         struct cm_work *work;
2963         enum ib_cm_event_type event;
2964         int paths = 0;
2965
2966         switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
2967         case CM_REQ_ATTR_ID:
2968                 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)->
2969                                                     alt_local_lid != 0);
2970                 event = IB_CM_REQ_RECEIVED;
2971                 break;
2972         case CM_MRA_ATTR_ID:
2973                 event = IB_CM_MRA_RECEIVED;
2974                 break;
2975         case CM_REJ_ATTR_ID:
2976                 event = IB_CM_REJ_RECEIVED;
2977                 break;
2978         case CM_REP_ATTR_ID:
2979                 event = IB_CM_REP_RECEIVED;
2980                 break;
2981         case CM_RTU_ATTR_ID:
2982                 event = IB_CM_RTU_RECEIVED;
2983                 break;
2984         case CM_DREQ_ATTR_ID:
2985                 event = IB_CM_DREQ_RECEIVED;
2986                 break;
2987         case CM_DREP_ATTR_ID:
2988                 event = IB_CM_DREP_RECEIVED;
2989                 break;
2990         case CM_SIDR_REQ_ATTR_ID:
2991                 event = IB_CM_SIDR_REQ_RECEIVED;
2992                 break;
2993         case CM_SIDR_REP_ATTR_ID:
2994                 event = IB_CM_SIDR_REP_RECEIVED;
2995                 break;
2996         case CM_LAP_ATTR_ID:
2997                 paths = 1;
2998                 event = IB_CM_LAP_RECEIVED;
2999                 break;
3000         case CM_APR_ATTR_ID:
3001                 event = IB_CM_APR_RECEIVED;
3002                 break;
3003         default:
3004                 ib_free_recv_mad(mad_recv_wc);
3005                 return;
3006         }
3007
3008         work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths,
3009                        GFP_KERNEL);
3010         if (!work) {
3011                 ib_free_recv_mad(mad_recv_wc);
3012                 return;
3013         }
3014
3015         INIT_WORK(&work->work, cm_work_handler, work);
3016         work->cm_event.event = event;
3017         work->mad_recv_wc = mad_recv_wc;
3018         work->port = (struct cm_port *)mad_agent->context;
3019         queue_work(cm.wq, &work->work);
3020 }
3021
3022 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
3023                                 struct ib_qp_attr *qp_attr,
3024                                 int *qp_attr_mask)
3025 {
3026         unsigned long flags;
3027         int ret;
3028
3029         spin_lock_irqsave(&cm_id_priv->lock, flags);
3030         switch (cm_id_priv->id.state) {
3031         case IB_CM_REQ_SENT:
3032         case IB_CM_MRA_REQ_RCVD:
3033         case IB_CM_REQ_RCVD:
3034         case IB_CM_MRA_REQ_SENT:
3035         case IB_CM_REP_RCVD:
3036         case IB_CM_MRA_REP_SENT:
3037         case IB_CM_REP_SENT:
3038         case IB_CM_MRA_REP_RCVD:
3039         case IB_CM_ESTABLISHED:
3040                 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
3041                                 IB_QP_PKEY_INDEX | IB_QP_PORT;
3042                 qp_attr->qp_access_flags = IB_ACCESS_LOCAL_WRITE |
3043                                            IB_ACCESS_REMOTE_WRITE;
3044                 if (cm_id_priv->responder_resources)
3045                         qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ;
3046                 qp_attr->pkey_index = cm_id_priv->av.pkey_index;
3047                 qp_attr->port_num = cm_id_priv->av.port->port_num;
3048                 ret = 0;
3049                 break;
3050         default:
3051                 ret = -EINVAL;
3052                 break;
3053         }
3054         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3055         return ret;
3056 }
3057
3058 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
3059                                struct ib_qp_attr *qp_attr,
3060                                int *qp_attr_mask)
3061 {
3062         unsigned long flags;
3063         int ret;
3064
3065         spin_lock_irqsave(&cm_id_priv->lock, flags);
3066         switch (cm_id_priv->id.state) {
3067         case IB_CM_REQ_RCVD:
3068         case IB_CM_MRA_REQ_SENT:
3069         case IB_CM_REP_RCVD:
3070         case IB_CM_MRA_REP_SENT:
3071         case IB_CM_REP_SENT:
3072         case IB_CM_MRA_REP_RCVD:
3073         case IB_CM_ESTABLISHED:
3074                 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
3075                                 IB_QP_DEST_QPN | IB_QP_RQ_PSN;
3076                 qp_attr->ah_attr = cm_id_priv->av.ah_attr;
3077                 qp_attr->path_mtu = cm_id_priv->path_mtu;
3078                 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
3079                 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
3080                 if (cm_id_priv->qp_type == IB_QPT_RC) {
3081                         *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC |
3082                                          IB_QP_MIN_RNR_TIMER;
3083                         qp_attr->max_dest_rd_atomic =
3084                                         cm_id_priv->responder_resources;
3085                         qp_attr->min_rnr_timer = 0;
3086                 }
3087                 if (cm_id_priv->alt_av.ah_attr.dlid) {
3088                         *qp_attr_mask |= IB_QP_ALT_PATH;
3089                         qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3090                 }
3091                 ret = 0;
3092                 break;
3093         default:
3094                 ret = -EINVAL;
3095                 break;
3096         }
3097         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3098         return ret;
3099 }
3100
3101 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv,
3102                                struct ib_qp_attr *qp_attr,
3103                                int *qp_attr_mask)
3104 {
3105         unsigned long flags;
3106         int ret;
3107
3108         spin_lock_irqsave(&cm_id_priv->lock, flags);
3109         switch (cm_id_priv->id.state) {
3110         case IB_CM_REP_RCVD:
3111         case IB_CM_MRA_REP_SENT:
3112         case IB_CM_REP_SENT:
3113         case IB_CM_MRA_REP_RCVD:
3114         case IB_CM_ESTABLISHED:
3115                 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN;
3116                 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn);
3117                 if (cm_id_priv->qp_type == IB_QPT_RC) {
3118                         *qp_attr_mask |= IB_QP_TIMEOUT | IB_QP_RETRY_CNT |
3119                                          IB_QP_RNR_RETRY |
3120                                          IB_QP_MAX_QP_RD_ATOMIC;
3121                         qp_attr->timeout = cm_id_priv->local_ack_timeout;
3122                         qp_attr->retry_cnt = cm_id_priv->retry_count;
3123                         qp_attr->rnr_retry = cm_id_priv->rnr_retry_count;
3124                         qp_attr->max_rd_atomic = cm_id_priv->initiator_depth;
3125                 }
3126                 if (cm_id_priv->alt_av.ah_attr.dlid) {
3127                         *qp_attr_mask |= IB_QP_PATH_MIG_STATE;
3128                         qp_attr->path_mig_state = IB_MIG_REARM;
3129                 }
3130                 ret = 0;
3131                 break;
3132         default:
3133                 ret = -EINVAL;
3134                 break;
3135         }
3136         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3137         return ret;
3138 }
3139
3140 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
3141                        struct ib_qp_attr *qp_attr,
3142                        int *qp_attr_mask)
3143 {
3144         struct cm_id_private *cm_id_priv;
3145         int ret;
3146
3147         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3148         switch (qp_attr->qp_state) {
3149         case IB_QPS_INIT:
3150                 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask);
3151                 break;
3152         case IB_QPS_RTR:
3153                 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask);
3154                 break;
3155         case IB_QPS_RTS:
3156                 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask);
3157                 break;
3158         default:
3159                 ret = -EINVAL;
3160                 break;
3161         }
3162         return ret;
3163 }
3164 EXPORT_SYMBOL(ib_cm_init_qp_attr);
3165
3166 static void cm_add_one(struct ib_device *device)
3167 {
3168         struct cm_device *cm_dev;
3169         struct cm_port *port;
3170         struct ib_mad_reg_req reg_req = {
3171                 .mgmt_class = IB_MGMT_CLASS_CM,
3172                 .mgmt_class_version = IB_CM_CLASS_VERSION
3173         };
3174         struct ib_port_modify port_modify = {
3175                 .set_port_cap_mask = IB_PORT_CM_SUP
3176         };
3177         unsigned long flags;
3178         int ret;
3179         u8 i;
3180
3181         cm_dev = kmalloc(sizeof(*cm_dev) + sizeof(*port) *
3182                          device->phys_port_cnt, GFP_KERNEL);
3183         if (!cm_dev)
3184                 return;
3185
3186         cm_dev->device = device;
3187         cm_dev->ca_guid = device->node_guid;
3188
3189         set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
3190         for (i = 1; i <= device->phys_port_cnt; i++) {
3191                 port = &cm_dev->port[i-1];
3192                 port->cm_dev = cm_dev;
3193                 port->port_num = i;
3194                 port->mad_agent = ib_register_mad_agent(device, i,
3195                                                         IB_QPT_GSI,
3196                                                         &reg_req,
3197                                                         0,
3198                                                         cm_send_handler,
3199                                                         cm_recv_handler,
3200                                                         port);
3201                 if (IS_ERR(port->mad_agent))
3202                         goto error1;
3203
3204                 ret = ib_modify_port(device, i, 0, &port_modify);
3205                 if (ret)
3206                         goto error2;
3207         }
3208         ib_set_client_data(device, &cm_client, cm_dev);
3209
3210         write_lock_irqsave(&cm.device_lock, flags);
3211         list_add_tail(&cm_dev->list, &cm.device_list);
3212         write_unlock_irqrestore(&cm.device_lock, flags);
3213         return;
3214
3215 error2:
3216         ib_unregister_mad_agent(port->mad_agent);
3217 error1:
3218         port_modify.set_port_cap_mask = 0;
3219         port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
3220         while (--i) {
3221                 port = &cm_dev->port[i-1];
3222                 ib_modify_port(device, port->port_num, 0, &port_modify);
3223                 ib_unregister_mad_agent(port->mad_agent);
3224         }
3225         kfree(cm_dev);
3226 }
3227
3228 static void cm_remove_one(struct ib_device *device)
3229 {
3230         struct cm_device *cm_dev;
3231         struct cm_port *port;
3232         struct ib_port_modify port_modify = {
3233                 .clr_port_cap_mask = IB_PORT_CM_SUP
3234         };
3235         unsigned long flags;
3236         int i;
3237
3238         cm_dev = ib_get_client_data(device, &cm_client);
3239         if (!cm_dev)
3240                 return;
3241
3242         write_lock_irqsave(&cm.device_lock, flags);
3243         list_del(&cm_dev->list);
3244         write_unlock_irqrestore(&cm.device_lock, flags);
3245
3246         for (i = 1; i <= device->phys_port_cnt; i++) {
3247                 port = &cm_dev->port[i-1];
3248                 ib_modify_port(device, port->port_num, 0, &port_modify);
3249                 ib_unregister_mad_agent(port->mad_agent);
3250         }
3251         kfree(cm_dev);
3252 }
3253
3254 static int __init ib_cm_init(void)
3255 {
3256         int ret;
3257
3258         memset(&cm, 0, sizeof cm);
3259         INIT_LIST_HEAD(&cm.device_list);
3260         rwlock_init(&cm.device_lock);
3261         spin_lock_init(&cm.lock);
3262         cm.listen_service_table = RB_ROOT;
3263         cm.listen_service_id = __constant_be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID);
3264         cm.remote_id_table = RB_ROOT;
3265         cm.remote_qp_table = RB_ROOT;
3266         cm.remote_sidr_table = RB_ROOT;
3267         idr_init(&cm.local_id_table);
3268         idr_pre_get(&cm.local_id_table, GFP_KERNEL);
3269
3270         cm.wq = create_workqueue("ib_cm");
3271         if (!cm.wq)
3272                 return -ENOMEM;
3273
3274         ret = ib_register_client(&cm_client);
3275         if (ret)
3276                 goto error;
3277
3278         return 0;
3279 error:
3280         destroy_workqueue(cm.wq);
3281         return ret;
3282 }
3283
3284 static void __exit ib_cm_cleanup(void)
3285 {
3286         flush_workqueue(cm.wq);
3287         destroy_workqueue(cm.wq);
3288         ib_unregister_client(&cm_client);
3289         idr_destroy(&cm.local_id_table);
3290 }
3291
3292 module_init(ib_cm_init);
3293 module_exit(ib_cm_cleanup);
3294