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   1 /*
   2  * Copyright (c) 2004, 2005 Intel Corporation.  All rights reserved.
   3  * Copyright (c) 2004 Topspin Corporation.  All rights reserved.
   4  * Copyright (c) 2004, 2005 Voltaire Corporation.  All rights reserved.
   5  * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
   6  *
   7  * This software is available to you under a choice of one of two
   8  * licenses.  You may choose to be licensed under the terms of the GNU
   9  * General Public License (GPL) Version 2, available from the file
  10  * COPYING in the main directory of this source tree, or the
  11  * OpenIB.org BSD license below:
  12  *
  13  *     Redistribution and use in source and binary forms, with or
  14  *     without modification, are permitted provided that the following
  15  *     conditions are met:
  16  *
  17  *      - Redistributions of source code must retain the above
  18  *        copyright notice, this list of conditions and the following
  19  *        disclaimer.
  20  *
  21  *      - Redistributions in binary form must reproduce the above
  22  *        copyright notice, this list of conditions and the following
  23  *        disclaimer in the documentation and/or other materials
  24  *        provided with the distribution.
  25  *
  26  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  27  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  28  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  29  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  30  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  31  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  32  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  33  * SOFTWARE.
  34  *
  35  * $Id: cm.c 2821 2005-07-08 17:07:28Z sean.hefty $
  36  */
  37 #include <linux/dma-mapping.h>
  38 #include <linux/err.h>
  39 #include <linux/idr.h>
  40 #include <linux/interrupt.h>
  41 #include <linux/pci.h>
  42 #include <linux/rbtree.h>
  43 #include <linux/spinlock.h>
  44 #include <linux/workqueue.h>
  45
  46 #include <rdma/ib_cache.h>
  47 #include <rdma/ib_cm.h>
  48 #include "cm_msgs.h"
  49
  50 MODULE_AUTHOR("Sean Hefty");
  51 MODULE_DESCRIPTION("InfiniBand CM");
  52 MODULE_LICENSE("Dual BSD/GPL");
  53
  54 static void cm_add_one(struct ib_device *device);
  55 static void cm_remove_one(struct ib_device *device);
  56
  57 static struct ib_client cm_client = {
  58         .name   = "cm",
  59         .add    = cm_add_one,
  60         .remove = cm_remove_one
  61 };
  62
  63 static struct ib_cm {
  64         spinlock_t lock;
  65         struct list_head device_list;
  66         rwlock_t device_lock;
  67         struct rb_root listen_service_table;
  68         u64 listen_service_id;
  69         /* struct rb_root peer_service_table; todo: fix peer to peer */
  70         struct rb_root remote_qp_table;
  71         struct rb_root remote_id_table;
  72         struct rb_root remote_sidr_table;
  73         struct idr local_id_table;
  74         struct workqueue_struct *wq;
  75 } cm;
  76
  77 struct cm_port {
  78         struct cm_device *cm_dev;
  79         struct ib_mad_agent *mad_agent;
  80         u8 port_num;
  81 };
  82
  83 struct cm_device {
  84         struct list_head list;
  85         struct ib_device *device;
  86         __be64 ca_guid;
  87         struct cm_port port[0];
  88 };
  89
  90 struct cm_av {
  91         struct cm_port *port;
  92         union ib_gid dgid;
  93         struct ib_ah_attr ah_attr;
  94         u16 pkey_index;
  95         u8 packet_life_time;
  96 };
  97
  98 struct cm_work {
  99         struct work_struct work;
 100         struct list_head list;
 101         struct cm_port *port;
 102         struct ib_mad_recv_wc *mad_recv_wc;     /* Received MADs */
 103         __be32 local_id;                        /* Established / timewait */
 104         __be32 remote_id;
 105         struct ib_cm_event cm_event;
 106         struct ib_sa_path_rec path[0];
 107 };
 108
 109 struct cm_timewait_info {
 110         struct cm_work work;                    /* Must be first. */
 111         struct rb_node remote_qp_node;
 112         struct rb_node remote_id_node;
 113         __be64 remote_ca_guid;
 114         __be32 remote_qpn;
 115         u8 inserted_remote_qp;
 116         u8 inserted_remote_id;
 117 };
 118
 119 struct cm_id_private {
 120         struct ib_cm_id id;
 121
 122         struct rb_node service_node;
 123         struct rb_node sidr_id_node;
 124         spinlock_t lock;
 125         wait_queue_head_t wait;
 126         atomic_t refcount;
 127
 128         struct ib_mad_send_buf *msg;
 129         struct cm_timewait_info *timewait_info;
 130         /* todo: use alternate port on send failure */
 131         struct cm_av av;
 132         struct cm_av alt_av;
 133
 134         void *private_data;
 135         __be64 tid;
 136         __be32 local_qpn;
 137         __be32 remote_qpn;
 138         enum ib_qp_type qp_type;
 139         __be32 sq_psn;
 140         __be32 rq_psn;
 141         int timeout_ms;
 142         enum ib_mtu path_mtu;
 143         u8 private_data_len;
 144         u8 max_cm_retries;
 145         u8 peer_to_peer;
 146         u8 responder_resources;
 147         u8 initiator_depth;
 148         u8 local_ack_timeout;
 149         u8 retry_count;
 150         u8 rnr_retry_count;
 151         u8 service_timeout;
 152
 153         struct list_head work_list;
 154         atomic_t work_count;
 155 };
 156
 157 static void cm_work_handler(void *data);
 158
 159 static inline void cm_deref_id(struct cm_id_private *cm_id_priv)
 160 {
 161         if (atomic_dec_and_test(&cm_id_priv->refcount))
 162                 wake_up(&cm_id_priv->wait);
 163 }
 164
 165 static int cm_alloc_msg(struct cm_id_private *cm_id_priv,
 166                         struct ib_mad_send_buf **msg)
 167 {
 168         struct ib_mad_agent *mad_agent;
 169         struct ib_mad_send_buf *m;
 170         struct ib_ah *ah;
 171
 172         mad_agent = cm_id_priv->av.port->mad_agent;
 173         ah = ib_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr);
 174         if (IS_ERR(ah))
 175                 return PTR_ERR(ah);
 176
 177         m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn,
 178                                cm_id_priv->av.pkey_index,
 179                                0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
 180                                GFP_ATOMIC);
 181         if (IS_ERR(m)) {
 182                 ib_destroy_ah(ah);
 183                 return PTR_ERR(m);
 184         }
 185
 186         /* Timeout set by caller if response is expected. */
 187         m->ah = ah;
 188         m->retries = cm_id_priv->max_cm_retries;
 189
 190         atomic_inc(&cm_id_priv->refcount);
 191         m->context[0] = cm_id_priv;
 192         *msg = m;
 193         return 0;
 194 }
 195
 196 static int cm_alloc_response_msg(struct cm_port *port,
 197                                  struct ib_mad_recv_wc *mad_recv_wc,
 198                                  struct ib_mad_send_buf **msg)
 199 {
 200         struct ib_mad_send_buf *m;
 201         struct ib_ah *ah;
 202
 203         ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc,
 204                                   mad_recv_wc->recv_buf.grh, port->port_num);
 205         if (IS_ERR(ah))
 206                 return PTR_ERR(ah);
 207
 208         m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index,
 209                                0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
 210                                GFP_ATOMIC);
 211         if (IS_ERR(m)) {
 212                 ib_destroy_ah(ah);
 213                 return PTR_ERR(m);
 214         }
 215         m->ah = ah;
 216         *msg = m;
 217         return 0;
 218 }
 219
 220 static void cm_free_msg(struct ib_mad_send_buf *msg)
 221 {
 222         ib_destroy_ah(msg->ah);
 223         if (msg->context[0])
 224                 cm_deref_id(msg->context[0]);
 225         ib_free_send_mad(msg);
 226 }
 227
 228 static void * cm_copy_private_data(const void *private_data,
 229                                    u8 private_data_len)
 230 {
 231         void *data;
 232
 233         if (!private_data || !private_data_len)
 234                 return NULL;
 235
 236         data = kmalloc(private_data_len, GFP_KERNEL);
 237         if (!data)
 238                 return ERR_PTR(-ENOMEM);
 239
 240         memcpy(data, private_data, private_data_len);
 241         return data;
 242 }
 243
 244 static void cm_set_private_data(struct cm_id_private *cm_id_priv,
 245                                  void *private_data, u8 private_data_len)
 246 {
 247         if (cm_id_priv->private_data && cm_id_priv->private_data_len)
 248                 kfree(cm_id_priv->private_data);
 249
 250         cm_id_priv->private_data = private_data;
 251         cm_id_priv->private_data_len = private_data_len;
 252 }
 253
 254 static void cm_set_ah_attr(struct ib_ah_attr *ah_attr, u8 port_num,
 255                            u16 dlid, u8 sl, u16 src_path_bits)
 256 {
 257         memset(ah_attr, 0, sizeof ah_attr);
 258         ah_attr->dlid = dlid;
 259         ah_attr->sl = sl;
 260         ah_attr->src_path_bits = src_path_bits;
 261         ah_attr->port_num = port_num;
 262 }
 263
 264 static void cm_init_av_for_response(struct cm_port *port,
 265                                     struct ib_wc *wc, struct cm_av *av)
 266 {
 267         av->port = port;
 268         av->pkey_index = wc->pkey_index;
 269         cm_set_ah_attr(&av->ah_attr, port->port_num, wc->slid,
 270                        wc->sl, wc->dlid_path_bits);
 271 }
 272
 273 static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av)
 274 {
 275         struct cm_device *cm_dev;
 276         struct cm_port *port = NULL;
 277         unsigned long flags;
 278         int ret;
 279         u8 p;
 280
 281         read_lock_irqsave(&cm.device_lock, flags);
 282         list_for_each_entry(cm_dev, &cm.device_list, list) {
 283                 if (!ib_find_cached_gid(cm_dev->device, &path->sgid,
 284                                         &p, NULL)) {
 285                         port = &cm_dev->port[p-1];
 286                         break;
 287                 }
 288         }
 289         read_unlock_irqrestore(&cm.device_lock, flags);
 290
 291         if (!port)
 292                 return -EINVAL;
 293
 294         ret = ib_find_cached_pkey(cm_dev->device, port->port_num,
 295                                   be16_to_cpu(path->pkey), &av->pkey_index);
 296         if (ret)
 297                 return ret;
 298
 299         av->port = port;
 300         cm_set_ah_attr(&av->ah_attr, av->port->port_num,
 301                        be16_to_cpu(path->dlid), path->sl,
 302                        be16_to_cpu(path->slid) & 0x7F);
 303         av->packet_life_time = path->packet_life_time;
 304         return 0;
 305 }
 306
 307 static int cm_alloc_id(struct cm_id_private *cm_id_priv)
 308 {
 309         unsigned long flags;
 310         int ret;
 311
 312         do {
 313                 spin_lock_irqsave(&cm.lock, flags);
 314                 ret = idr_get_new_above(&cm.local_id_table, cm_id_priv, 1,
 315                                         (__force int *) &cm_id_priv->id.local_id);
 316                 spin_unlock_irqrestore(&cm.lock, flags);
 317         } while( (ret == -EAGAIN) && idr_pre_get(&cm.local_id_table, GFP_KERNEL) );
 318         return ret;
 319 }
 320
 321 static void cm_free_id(__be32 local_id)
 322 {
 323         unsigned long flags;
 324
 325         spin_lock_irqsave(&cm.lock, flags);
 326         idr_remove(&cm.local_id_table, (__force int) local_id);
 327         spin_unlock_irqrestore(&cm.lock, flags);
 328 }
 329
 330 static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id)
 331 {
 332         struct cm_id_private *cm_id_priv;
 333
 334         cm_id_priv = idr_find(&cm.local_id_table, (__force int) local_id);
 335         if (cm_id_priv) {
 336                 if (cm_id_priv->id.remote_id == remote_id)
 337                         atomic_inc(&cm_id_priv->refcount);
 338                 else
 339                         cm_id_priv = NULL;
 340         }
 341
 342         return cm_id_priv;
 343 }
 344
 345 static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id)
 346 {
 347         struct cm_id_private *cm_id_priv;
 348         unsigned long flags;
 349
 350         spin_lock_irqsave(&cm.lock, flags);
 351         cm_id_priv = cm_get_id(local_id, remote_id);
 352         spin_unlock_irqrestore(&cm.lock, flags);
 353
 354         return cm_id_priv;
 355 }
 356
 357 static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv)
 358 {
 359         struct rb_node **link = &cm.listen_service_table.rb_node;
 360         struct rb_node *parent = NULL;
 361         struct cm_id_private *cur_cm_id_priv;
 362         __be64 service_id = cm_id_priv->id.service_id;
 363         __be64 service_mask = cm_id_priv->id.service_mask;
 364
 365         while (*link) {
 366                 parent = *link;
 367                 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
 368                                           service_node);
 369                 if ((cur_cm_id_priv->id.service_mask & service_id) ==
 370                     (service_mask & cur_cm_id_priv->id.service_id) &&
 371                     (cm_id_priv->id.device == cur_cm_id_priv->id.device))
 372                         return cur_cm_id_priv;
 373
 374                 if (cm_id_priv->id.device < cur_cm_id_priv->id.device)
 375                         link = &(*link)->rb_left;
 376                 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device)
 377                         link = &(*link)->rb_right;
 378                 else if (service_id < cur_cm_id_priv->id.service_id)
 379                         link = &(*link)->rb_left;
 380                 else
 381                         link = &(*link)->rb_right;
 382         }
 383         rb_link_node(&cm_id_priv->service_node, parent, link);
 384         rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table);
 385         return NULL;
 386 }
 387
 388 static struct cm_id_private * cm_find_listen(struct ib_device *device,
 389                                              __be64 service_id)
 390 {
 391         struct rb_node *node = cm.listen_service_table.rb_node;
 392         struct cm_id_private *cm_id_priv;
 393
 394         while (node) {
 395                 cm_id_priv = rb_entry(node, struct cm_id_private, service_node);
 396                 if ((cm_id_priv->id.service_mask & service_id) ==
 397                      cm_id_priv->id.service_id &&
 398                     (cm_id_priv->id.device == device))
 399                         return cm_id_priv;
 400
 401                 if (device < cm_id_priv->id.device)
 402                         node = node->rb_left;
 403                 else if (device > cm_id_priv->id.device)
 404                         node = node->rb_right;
 405                 else if (service_id < cm_id_priv->id.service_id)
 406                         node = node->rb_left;
 407                 else
 408                         node = node->rb_right;
 409         }
 410         return NULL;
 411 }
 412
 413 static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info
 414                                                      *timewait_info)
 415 {
 416         struct rb_node **link = &cm.remote_id_table.rb_node;
 417         struct rb_node *parent = NULL;
 418         struct cm_timewait_info *cur_timewait_info;
 419         __be64 remote_ca_guid = timewait_info->remote_ca_guid;
 420         __be32 remote_id = timewait_info->work.remote_id;
 421
 422         while (*link) {
 423                 parent = *link;
 424                 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
 425                                              remote_id_node);
 426                 if (remote_id < cur_timewait_info->work.remote_id)
 427                         link = &(*link)->rb_left;
 428                 else if (remote_id > cur_timewait_info->work.remote_id)
 429                         link = &(*link)->rb_right;
 430                 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid)
 431                         link = &(*link)->rb_left;
 432                 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid)
 433                         link = &(*link)->rb_right;
 434                 else
 435                         return cur_timewait_info;
 436         }
 437         timewait_info->inserted_remote_id = 1;
 438         rb_link_node(&timewait_info->remote_id_node, parent, link);
 439         rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table);
 440         return NULL;
 441 }
 442
 443 static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid,
 444                                                    __be32 remote_id)
 445 {
 446         struct rb_node *node = cm.remote_id_table.rb_node;
 447         struct cm_timewait_info *timewait_info;
 448
 449         while (node) {
 450                 timewait_info = rb_entry(node, struct cm_timewait_info,
 451                                          remote_id_node);
 452                 if (remote_id < timewait_info->work.remote_id)
 453                         node = node->rb_left;
 454                 else if (remote_id > timewait_info->work.remote_id)
 455                         node = node->rb_right;
 456                 else if (remote_ca_guid < timewait_info->remote_ca_guid)
 457                         node = node->rb_left;
 458                 else if (remote_ca_guid > timewait_info->remote_ca_guid)
 459                         node = node->rb_right;
 460                 else
 461                         return timewait_info;
 462         }
 463         return NULL;
 464 }
 465
 466 static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info
 467                                                       *timewait_info)
 468 {
 469         struct rb_node **link = &cm.remote_qp_table.rb_node;
 470         struct rb_node *parent = NULL;
 471         struct cm_timewait_info *cur_timewait_info;
 472         __be64 remote_ca_guid = timewait_info->remote_ca_guid;
 473         __be32 remote_qpn = timewait_info->remote_qpn;
 474
 475         while (*link) {
 476                 parent = *link;
 477                 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
 478                                              remote_qp_node);
 479                 if (remote_qpn < cur_timewait_info->remote_qpn)
 480                         link = &(*link)->rb_left;
 481                 else if (remote_qpn > cur_timewait_info->remote_qpn)
 482                         link = &(*link)->rb_right;
 483                 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid)
 484                         link = &(*link)->rb_left;
 485                 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid)
 486                         link = &(*link)->rb_right;
 487                 else
 488                         return cur_timewait_info;
 489         }
 490         timewait_info->inserted_remote_qp = 1;
 491         rb_link_node(&timewait_info->remote_qp_node, parent, link);
 492         rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table);
 493         return NULL;
 494 }
 495
 496 static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private
 497                                                     *cm_id_priv)
 498 {
 499         struct rb_node **link = &cm.remote_sidr_table.rb_node;
 500         struct rb_node *parent = NULL;
 501         struct cm_id_private *cur_cm_id_priv;
 502         union ib_gid *port_gid = &cm_id_priv->av.dgid;
 503         __be32 remote_id = cm_id_priv->id.remote_id;
 504
 505         while (*link) {
 506                 parent = *link;
 507                 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
 508                                           sidr_id_node);
 509                 if (remote_id < cur_cm_id_priv->id.remote_id)
 510                         link = &(*link)->rb_left;
 511                 else if (remote_id > cur_cm_id_priv->id.remote_id)
 512                         link = &(*link)->rb_right;
 513                 else {
 514                         int cmp;
 515                         cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid,
 516                                      sizeof *port_gid);
 517                         if (cmp < 0)
 518                                 link = &(*link)->rb_left;
 519                         else if (cmp > 0)
 520                                 link = &(*link)->rb_right;
 521                         else
 522                                 return cur_cm_id_priv;
 523                 }
 524         }
 525         rb_link_node(&cm_id_priv->sidr_id_node, parent, link);
 526         rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
 527         return NULL;
 528 }
 529
 530 static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv,
 531                                enum ib_cm_sidr_status status)
 532 {
 533         struct ib_cm_sidr_rep_param param;
 534
 535         memset(&param, 0, sizeof param);
 536         param.status = status;
 537         ib_send_cm_sidr_rep(&cm_id_priv->id, &param);
 538 }
 539
 540 struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
 541                                  ib_cm_handler cm_handler,
 542                                  void *context)
 543 {
 544         struct cm_id_private *cm_id_priv;
 545         int ret;
 546
 547         cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL);
 548         if (!cm_id_priv)
 549                 return ERR_PTR(-ENOMEM);
 550
 551         cm_id_priv->id.state = IB_CM_IDLE;
 552         cm_id_priv->id.device = device;
 553         cm_id_priv->id.cm_handler = cm_handler;
 554         cm_id_priv->id.context = context;
 555         cm_id_priv->id.remote_cm_qpn = 1;
 556         ret = cm_alloc_id(cm_id_priv);
 557         if (ret)
 558                 goto error;
 559
 560         spin_lock_init(&cm_id_priv->lock);
 561         init_waitqueue_head(&cm_id_priv->wait);
 562         INIT_LIST_HEAD(&cm_id_priv->work_list);
 563         atomic_set(&cm_id_priv->work_count, -1);
 564         atomic_set(&cm_id_priv->refcount, 1);
 565         return &cm_id_priv->id;
 566
 567 error:
 568         kfree(cm_id_priv);
 569         return ERR_PTR(-ENOMEM);
 570 }
 571 EXPORT_SYMBOL(ib_create_cm_id);
 572
 573 static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv)
 574 {
 575         struct cm_work *work;
 576
 577         if (list_empty(&cm_id_priv->work_list))
 578                 return NULL;
 579
 580         work = list_entry(cm_id_priv->work_list.next, struct cm_work, list);
 581         list_del(&work->list);
 582         return work;
 583 }
 584
 585 static void cm_free_work(struct cm_work *work)
 586 {
 587         if (work->mad_recv_wc)
 588                 ib_free_recv_mad(work->mad_recv_wc);
 589         kfree(work);
 590 }
 591
 592 static inline int cm_convert_to_ms(int iba_time)
 593 {
 594         /* approximate conversion to ms from 4.096us x 2^iba_time */
 595         return 1 << max(iba_time - 8, 0);
 596 }
 597
 598 static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info)
 599 {
 600         unsigned long flags;
 601
 602         if (!timewait_info->inserted_remote_id &&
 603             !timewait_info->inserted_remote_qp)
 604             return;
 605
 606         spin_lock_irqsave(&cm.lock, flags);
 607         if (timewait_info->inserted_remote_id) {
 608                 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table);
 609                 timewait_info->inserted_remote_id = 0;
 610         }
 611
 612         if (timewait_info->inserted_remote_qp) {
 613                 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table);
 614                 timewait_info->inserted_remote_qp = 0;
 615         }
 616         spin_unlock_irqrestore(&cm.lock, flags);
 617 }
 618
 619 static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id)
 620 {
 621         struct cm_timewait_info *timewait_info;
 622
 623         timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL);
 624         if (!timewait_info)
 625                 return ERR_PTR(-ENOMEM);
 626
 627         timewait_info->work.local_id = local_id;
 628         INIT_WORK(&timewait_info->work.work, cm_work_handler,
 629                   &timewait_info->work);
 630         timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT;
 631         return timewait_info;
 632 }
 633
 634 static void cm_enter_timewait(struct cm_id_private *cm_id_priv)
 635 {
 636         int wait_time;
 637
 638         /*
 639          * The cm_id could be destroyed by the user before we exit timewait.
 640          * To protect against this, we search for the cm_id after exiting
 641          * timewait before notifying the user that we've exited timewait.
 642          */
 643         cm_id_priv->id.state = IB_CM_TIMEWAIT;
 644         wait_time = cm_convert_to_ms(cm_id_priv->local_ack_timeout);
 645         queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work,
 646                            msecs_to_jiffies(wait_time));
 647         cm_id_priv->timewait_info = NULL;
 648 }
 649
 650 static void cm_reset_to_idle(struct cm_id_private *cm_id_priv)
 651 {
 652         cm_id_priv->id.state = IB_CM_IDLE;
 653         if (cm_id_priv->timewait_info) {
 654                 cm_cleanup_timewait(cm_id_priv->timewait_info);
 655                 kfree(cm_id_priv->timewait_info);
 656                 cm_id_priv->timewait_info = NULL;
 657         }
 658 }
 659
 660 void ib_destroy_cm_id(struct ib_cm_id *cm_id)
 661 {
 662         struct cm_id_private *cm_id_priv;
 663         struct cm_work *work;
 664         unsigned long flags;
 665
 666         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
 667 retest:
 668         spin_lock_irqsave(&cm_id_priv->lock, flags);
 669         switch (cm_id->state) {
 670         case IB_CM_LISTEN:
 671                 cm_id->state = IB_CM_IDLE;
 672                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 673                 spin_lock_irqsave(&cm.lock, flags);
 674                 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table);
 675                 spin_unlock_irqrestore(&cm.lock, flags);
 676                 break;
 677         case IB_CM_SIDR_REQ_SENT:
 678                 cm_id->state = IB_CM_IDLE;
 679                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
 680                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 681                 break;
 682         case IB_CM_SIDR_REQ_RCVD:
 683                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 684                 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT);
 685                 break;
 686         case IB_CM_REQ_SENT:
 687                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
 688                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 689                 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT,
 690                                &cm_id_priv->av.port->cm_dev->ca_guid,
 691                                sizeof cm_id_priv->av.port->cm_dev->ca_guid,
 692                                NULL, 0);
 693                 break;
 694         case IB_CM_MRA_REQ_RCVD:
 695         case IB_CM_REP_SENT:
 696         case IB_CM_MRA_REP_RCVD:
 697                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
 698                 /* Fall through */
 699         case IB_CM_REQ_RCVD:
 700         case IB_CM_MRA_REQ_SENT:
 701         case IB_CM_REP_RCVD:
 702         case IB_CM_MRA_REP_SENT:
 703                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 704                 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
 705                                NULL, 0, NULL, 0);
 706                 break;
 707         case IB_CM_ESTABLISHED:
 708                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 709                 ib_send_cm_dreq(cm_id, NULL, 0);
 710                 goto retest;
 711         case IB_CM_DREQ_SENT:
 712                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
 713                 cm_enter_timewait(cm_id_priv);
 714                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 715                 break;
 716         case IB_CM_DREQ_RCVD:
 717                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 718                 ib_send_cm_drep(cm_id, NULL, 0);
 719                 break;
 720         default:
 721                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 722                 break;
 723         }
 724
 725         cm_free_id(cm_id->local_id);
 726         atomic_dec(&cm_id_priv->refcount);
 727         wait_event(cm_id_priv->wait, !atomic_read(&cm_id_priv->refcount));
 728         while ((work = cm_dequeue_work(cm_id_priv)) != NULL)
 729                 cm_free_work(work);
 730         if (cm_id_priv->private_data && cm_id_priv->private_data_len)
 731                 kfree(cm_id_priv->private_data);
 732         kfree(cm_id_priv);
 733 }
 734 EXPORT_SYMBOL(ib_destroy_cm_id);
 735
 736 int ib_cm_listen(struct ib_cm_id *cm_id,
 737                  __be64 service_id,
 738                  __be64 service_mask)
 739 {
 740         struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
 741         unsigned long flags;
 742         int ret = 0;
 743
 744         service_mask = service_mask ? service_mask :
 745                        __constant_cpu_to_be64(~0ULL);
 746         service_id &= service_mask;
 747         if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID &&
 748             (service_id != IB_CM_ASSIGN_SERVICE_ID))
 749                 return -EINVAL;
 750
 751         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
 752         BUG_ON(cm_id->state != IB_CM_IDLE);
 753
 754         cm_id->state = IB_CM_LISTEN;
 755
 756         spin_lock_irqsave(&cm.lock, flags);
 757         if (service_id == IB_CM_ASSIGN_SERVICE_ID) {
 758                 cm_id->service_id = cpu_to_be64(cm.listen_service_id++);
 759                 cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
 760         } else {
 761                 cm_id->service_id = service_id;
 762                 cm_id->service_mask = service_mask;
 763         }
 764         cur_cm_id_priv = cm_insert_listen(cm_id_priv);
 765         spin_unlock_irqrestore(&cm.lock, flags);
 766
 767         if (cur_cm_id_priv) {
 768                 cm_id->state = IB_CM_IDLE;
 769                 ret = -EBUSY;
 770         }
 771         return ret;
 772 }
 773 EXPORT_SYMBOL(ib_cm_listen);
 774
 775 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv,
 776                           enum cm_msg_sequence msg_seq)
 777 {
 778         u64 hi_tid, low_tid;
 779
 780         hi_tid   = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32;
 781         low_tid  = (u64) ((__force u32)cm_id_priv->id.local_id |
 782                           (msg_seq << 30));
 783         return cpu_to_be64(hi_tid | low_tid);
 784 }
 785
 786 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr,
 787                               __be16 attr_id, __be64 tid)
 788 {
 789         hdr->base_version  = IB_MGMT_BASE_VERSION;
 790         hdr->mgmt_class    = IB_MGMT_CLASS_CM;
 791         hdr->class_version = IB_CM_CLASS_VERSION;
 792         hdr->method        = IB_MGMT_METHOD_SEND;
 793         hdr->attr_id       = attr_id;
 794         hdr->tid           = tid;
 795 }
 796
 797 static void cm_format_req(struct cm_req_msg *req_msg,
 798                           struct cm_id_private *cm_id_priv,
 799                           struct ib_cm_req_param *param)
 800 {
 801         cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID,
 802                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ));
 803
 804         req_msg->local_comm_id = cm_id_priv->id.local_id;
 805         req_msg->service_id = param->service_id;
 806         req_msg->local_ca_guid = cm_id_priv->av.port->cm_dev->ca_guid;
 807         cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num));
 808         cm_req_set_resp_res(req_msg, param->responder_resources);
 809         cm_req_set_init_depth(req_msg, param->initiator_depth);
 810         cm_req_set_remote_resp_timeout(req_msg,
 811                                        param->remote_cm_response_timeout);
 812         cm_req_set_qp_type(req_msg, param->qp_type);
 813         cm_req_set_flow_ctrl(req_msg, param->flow_control);
 814         cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn));
 815         cm_req_set_local_resp_timeout(req_msg,
 816                                       param->local_cm_response_timeout);
 817         cm_req_set_retry_count(req_msg, param->retry_count);
 818         req_msg->pkey = param->primary_path->pkey;
 819         cm_req_set_path_mtu(req_msg, param->primary_path->mtu);
 820         cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count);
 821         cm_req_set_max_cm_retries(req_msg, param->max_cm_retries);
 822         cm_req_set_srq(req_msg, param->srq);
 823
 824         req_msg->primary_local_lid = param->primary_path->slid;
 825         req_msg->primary_remote_lid = param->primary_path->dlid;
 826         req_msg->primary_local_gid = param->primary_path->sgid;
 827         req_msg->primary_remote_gid = param->primary_path->dgid;
 828         cm_req_set_primary_flow_label(req_msg, param->primary_path->flow_label);
 829         cm_req_set_primary_packet_rate(req_msg, param->primary_path->rate);
 830         req_msg->primary_traffic_class = param->primary_path->traffic_class;
 831         req_msg->primary_hop_limit = param->primary_path->hop_limit;
 832         cm_req_set_primary_sl(req_msg, param->primary_path->sl);
 833         cm_req_set_primary_subnet_local(req_msg, 1); /* local only... */
 834         cm_req_set_primary_local_ack_timeout(req_msg,
 835                 min(31, param->primary_path->packet_life_time + 1));
 836
 837         if (param->alternate_path) {
 838                 req_msg->alt_local_lid = param->alternate_path->slid;
 839                 req_msg->alt_remote_lid = param->alternate_path->dlid;
 840                 req_msg->alt_local_gid = param->alternate_path->sgid;
 841                 req_msg->alt_remote_gid = param->alternate_path->dgid;
 842                 cm_req_set_alt_flow_label(req_msg,
 843                                           param->alternate_path->flow_label);
 844                 cm_req_set_alt_packet_rate(req_msg, param->alternate_path->rate);
 845                 req_msg->alt_traffic_class = param->alternate_path->traffic_class;
 846                 req_msg->alt_hop_limit = param->alternate_path->hop_limit;
 847                 cm_req_set_alt_sl(req_msg, param->alternate_path->sl);
 848                 cm_req_set_alt_subnet_local(req_msg, 1); /* local only... */
 849                 cm_req_set_alt_local_ack_timeout(req_msg,
 850                         min(31, param->alternate_path->packet_life_time + 1));
 851         }
 852
 853         if (param->private_data && param->private_data_len)
 854                 memcpy(req_msg->private_data, param->private_data,
 855                        param->private_data_len);
 856 }
 857
 858 static inline int cm_validate_req_param(struct ib_cm_req_param *param)
 859 {
 860         /* peer-to-peer not supported */
 861         if (param->peer_to_peer)
 862                 return -EINVAL;
 863
 864         if (!param->primary_path)
 865                 return -EINVAL;
 866
 867         if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC)
 868                 return -EINVAL;
 869
 870         if (param->private_data &&
 871             param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE)
 872                 return -EINVAL;
 873
 874         if (param->alternate_path &&
 875             (param->alternate_path->pkey != param->primary_path->pkey ||
 876              param->alternate_path->mtu != param->primary_path->mtu))
 877                 return -EINVAL;
 878
 879         return 0;
 880 }
 881
 882 int ib_send_cm_req(struct ib_cm_id *cm_id,
 883                    struct ib_cm_req_param *param)
 884 {
 885         struct cm_id_private *cm_id_priv;
 886         struct cm_req_msg *req_msg;
 887         unsigned long flags;
 888         int ret;
 889
 890         ret = cm_validate_req_param(param);
 891         if (ret)
 892                 return ret;
 893
 894         /* Verify that we're not in timewait. */
 895         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
 896         spin_lock_irqsave(&cm_id_priv->lock, flags);
 897         if (cm_id->state != IB_CM_IDLE) {
 898                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 899                 ret = -EINVAL;
 900                 goto out;
 901         }
 902         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 903
 904         cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
 905                                                             id.local_id);
 906         if (IS_ERR(cm_id_priv->timewait_info))
 907                 goto out;
 908
 909         ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av);
 910         if (ret)
 911                 goto error1;
 912         if (param->alternate_path) {
 913                 ret = cm_init_av_by_path(param->alternate_path,
 914                                          &cm_id_priv->alt_av);
 915                 if (ret)
 916                         goto error1;
 917         }
 918         cm_id->service_id = param->service_id;
 919         cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
 920         cm_id_priv->timeout_ms = cm_convert_to_ms(
 921                                     param->primary_path->packet_life_time) * 2 +
 922                                  cm_convert_to_ms(
 923                                     param->remote_cm_response_timeout);
 924         cm_id_priv->max_cm_retries = param->max_cm_retries;
 925         cm_id_priv->initiator_depth = param->initiator_depth;
 926         cm_id_priv->responder_resources = param->responder_resources;
 927         cm_id_priv->retry_count = param->retry_count;
 928         cm_id_priv->path_mtu = param->primary_path->mtu;
 929         cm_id_priv->qp_type = param->qp_type;
 930
 931         ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg);
 932         if (ret)
 933                 goto error1;
 934
 935         req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad;
 936         cm_format_req(req_msg, cm_id_priv, param);
 937         cm_id_priv->tid = req_msg->hdr.tid;
 938         cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms;
 939         cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT;
 940
 941         cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg);
 942         cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg);
 943         cm_id_priv->local_ack_timeout =
 944                                 cm_req_get_primary_local_ack_timeout(req_msg);
 945
 946         spin_lock_irqsave(&cm_id_priv->lock, flags);
 947         ret = ib_post_send_mad(cm_id_priv->msg, NULL);
 948         if (ret) {
 949                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 950                 goto error2;
 951         }
 952         BUG_ON(cm_id->state != IB_CM_IDLE);
 953         cm_id->state = IB_CM_REQ_SENT;
 954         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 955         return 0;
 956
 957 error2: cm_free_msg(cm_id_priv->msg);
 958 error1: kfree(cm_id_priv->timewait_info);
 959 out:    return ret;
 960 }
 961 EXPORT_SYMBOL(ib_send_cm_req);
 962
 963 static int cm_issue_rej(struct cm_port *port,
 964                         struct ib_mad_recv_wc *mad_recv_wc,
 965                         enum ib_cm_rej_reason reason,
 966                         enum cm_msg_response msg_rejected,
 967                         void *ari, u8 ari_length)
 968 {
 969         struct ib_mad_send_buf *msg = NULL;
 970         struct cm_rej_msg *rej_msg, *rcv_msg;
 971         int ret;
 972
 973         ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
 974         if (ret)
 975                 return ret;
 976
 977         /* We just need common CM header information.  Cast to any message. */
 978         rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad;
 979         rej_msg = (struct cm_rej_msg *) msg->mad;
 980
 981         cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid);
 982         rej_msg->remote_comm_id = rcv_msg->local_comm_id;
 983         rej_msg->local_comm_id = rcv_msg->remote_comm_id;
 984         cm_rej_set_msg_rejected(rej_msg, msg_rejected);
 985         rej_msg->reason = cpu_to_be16(reason);
 986
 987         if (ari && ari_length) {
 988                 cm_rej_set_reject_info_len(rej_msg, ari_length);
 989                 memcpy(rej_msg->ari, ari, ari_length);
 990         }
 991
 992         ret = ib_post_send_mad(msg, NULL);
 993         if (ret)
 994                 cm_free_msg(msg);
 995
 996         return ret;
 997 }
 998
 999 static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid,
1000                                     __be32 local_qpn, __be32 remote_qpn)
1001 {
1002         return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) ||
1003                 ((local_ca_guid == remote_ca_guid) &&
1004                  (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn))));
1005 }
1006
1007 static inline void cm_format_paths_from_req(struct cm_req_msg *req_msg,
1008                                             struct ib_sa_path_rec *primary_path,
1009                                             struct ib_sa_path_rec *alt_path)
1010 {
1011         memset(primary_path, 0, sizeof *primary_path);
1012         primary_path->dgid = req_msg->primary_local_gid;
1013         primary_path->sgid = req_msg->primary_remote_gid;
1014         primary_path->dlid = req_msg->primary_local_lid;
1015         primary_path->slid = req_msg->primary_remote_lid;
1016         primary_path->flow_label = cm_req_get_primary_flow_label(req_msg);
1017         primary_path->hop_limit = req_msg->primary_hop_limit;
1018         primary_path->traffic_class = req_msg->primary_traffic_class;
1019         primary_path->reversible = 1;
1020         primary_path->pkey = req_msg->pkey;
1021         primary_path->sl = cm_req_get_primary_sl(req_msg);
1022         primary_path->mtu_selector = IB_SA_EQ;
1023         primary_path->mtu = cm_req_get_path_mtu(req_msg);
1024         primary_path->rate_selector = IB_SA_EQ;
1025         primary_path->rate = cm_req_get_primary_packet_rate(req_msg);
1026         primary_path->packet_life_time_selector = IB_SA_EQ;
1027         primary_path->packet_life_time =
1028                 cm_req_get_primary_local_ack_timeout(req_msg);
1029         primary_path->packet_life_time -= (primary_path->packet_life_time > 0);
1030
1031         if (req_msg->alt_local_lid) {
1032                 memset(alt_path, 0, sizeof *alt_path);
1033                 alt_path->dgid = req_msg->alt_local_gid;
1034                 alt_path->sgid = req_msg->alt_remote_gid;
1035                 alt_path->dlid = req_msg->alt_local_lid;
1036                 alt_path->slid = req_msg->alt_remote_lid;
1037                 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg);
1038                 alt_path->hop_limit = req_msg->alt_hop_limit;
1039                 alt_path->traffic_class = req_msg->alt_traffic_class;
1040                 alt_path->reversible = 1;
1041                 alt_path->pkey = req_msg->pkey;
1042                 alt_path->sl = cm_req_get_alt_sl(req_msg);
1043                 alt_path->mtu_selector = IB_SA_EQ;
1044                 alt_path->mtu = cm_req_get_path_mtu(req_msg);
1045                 alt_path->rate_selector = IB_SA_EQ;
1046                 alt_path->rate = cm_req_get_alt_packet_rate(req_msg);
1047                 alt_path->packet_life_time_selector = IB_SA_EQ;
1048                 alt_path->packet_life_time =
1049                         cm_req_get_alt_local_ack_timeout(req_msg);
1050                 alt_path->packet_life_time -= (alt_path->packet_life_time > 0);
1051         }
1052 }
1053
1054 static void cm_format_req_event(struct cm_work *work,
1055                                 struct cm_id_private *cm_id_priv,
1056                                 struct ib_cm_id *listen_id)
1057 {
1058         struct cm_req_msg *req_msg;
1059         struct ib_cm_req_event_param *param;
1060
1061         req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1062         param = &work->cm_event.param.req_rcvd;
1063         param->listen_id = listen_id;
1064         param->port = cm_id_priv->av.port->port_num;
1065         param->primary_path = &work->path[0];
1066         if (req_msg->alt_local_lid)
1067                 param->alternate_path = &work->path[1];
1068         else
1069                 param->alternate_path = NULL;
1070         param->remote_ca_guid = req_msg->local_ca_guid;
1071         param->remote_qkey = be32_to_cpu(req_msg->local_qkey);
1072         param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg));
1073         param->qp_type = cm_req_get_qp_type(req_msg);
1074         param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg));
1075         param->responder_resources = cm_req_get_init_depth(req_msg);
1076         param->initiator_depth = cm_req_get_resp_res(req_msg);
1077         param->local_cm_response_timeout =
1078                                         cm_req_get_remote_resp_timeout(req_msg);
1079         param->flow_control = cm_req_get_flow_ctrl(req_msg);
1080         param->remote_cm_response_timeout =
1081                                         cm_req_get_local_resp_timeout(req_msg);
1082         param->retry_count = cm_req_get_retry_count(req_msg);
1083         param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1084         param->srq = cm_req_get_srq(req_msg);
1085         work->cm_event.private_data = &req_msg->private_data;
1086 }
1087
1088 static void cm_process_work(struct cm_id_private *cm_id_priv,
1089                             struct cm_work *work)
1090 {
1091         unsigned long flags;
1092         int ret;
1093
1094         /* We will typically only have the current event to report. */
1095         ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
1096         cm_free_work(work);
1097
1098         while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) {
1099                 spin_lock_irqsave(&cm_id_priv->lock, flags);
1100                 work = cm_dequeue_work(cm_id_priv);
1101                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1102                 BUG_ON(!work);
1103                 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id,
1104                                                 &work->cm_event);
1105                 cm_free_work(work);
1106         }
1107         cm_deref_id(cm_id_priv);
1108         if (ret)
1109                 ib_destroy_cm_id(&cm_id_priv->id);
1110 }
1111
1112 static void cm_format_mra(struct cm_mra_msg *mra_msg,
1113                           struct cm_id_private *cm_id_priv,
1114                           enum cm_msg_response msg_mraed, u8 service_timeout,
1115                           const void *private_data, u8 private_data_len)
1116 {
1117         cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid);
1118         cm_mra_set_msg_mraed(mra_msg, msg_mraed);
1119         mra_msg->local_comm_id = cm_id_priv->id.local_id;
1120         mra_msg->remote_comm_id = cm_id_priv->id.remote_id;
1121         cm_mra_set_service_timeout(mra_msg, service_timeout);
1122
1123         if (private_data && private_data_len)
1124                 memcpy(mra_msg->private_data, private_data, private_data_len);
1125 }
1126
1127 static void cm_format_rej(struct cm_rej_msg *rej_msg,
1128                           struct cm_id_private *cm_id_priv,
1129                           enum ib_cm_rej_reason reason,
1130                           void *ari,
1131                           u8 ari_length,
1132                           const void *private_data,
1133                           u8 private_data_len)
1134 {
1135         cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid);
1136         rej_msg->remote_comm_id = cm_id_priv->id.remote_id;
1137
1138         switch(cm_id_priv->id.state) {
1139         case IB_CM_REQ_RCVD:
1140                 rej_msg->local_comm_id = 0;
1141                 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1142                 break;
1143         case IB_CM_MRA_REQ_SENT:
1144                 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1145                 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1146                 break;
1147         case IB_CM_REP_RCVD:
1148         case IB_CM_MRA_REP_SENT:
1149                 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1150                 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP);
1151                 break;
1152         default:
1153                 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1154                 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER);
1155                 break;
1156         }
1157
1158         rej_msg->reason = cpu_to_be16(reason);
1159         if (ari && ari_length) {
1160                 cm_rej_set_reject_info_len(rej_msg, ari_length);
1161                 memcpy(rej_msg->ari, ari, ari_length);
1162         }
1163
1164         if (private_data && private_data_len)
1165                 memcpy(rej_msg->private_data, private_data, private_data_len);
1166 }
1167
1168 static void cm_dup_req_handler(struct cm_work *work,
1169                                struct cm_id_private *cm_id_priv)
1170 {
1171         struct ib_mad_send_buf *msg = NULL;
1172         unsigned long flags;
1173         int ret;
1174
1175         /* Quick state check to discard duplicate REQs. */
1176         if (cm_id_priv->id.state == IB_CM_REQ_RCVD)
1177                 return;
1178
1179         ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1180         if (ret)
1181                 return;
1182
1183         spin_lock_irqsave(&cm_id_priv->lock, flags);
1184         switch (cm_id_priv->id.state) {
1185         case IB_CM_MRA_REQ_SENT:
1186                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1187                               CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout,
1188                               cm_id_priv->private_data,
1189                               cm_id_priv->private_data_len);
1190                 break;
1191         case IB_CM_TIMEWAIT:
1192                 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv,
1193                               IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0);
1194                 break;
1195         default:
1196                 goto unlock;
1197         }
1198         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1199
1200         ret = ib_post_send_mad(msg, NULL);
1201         if (ret)
1202                 goto free;
1203         return;
1204
1205 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1206 free:   cm_free_msg(msg);
1207 }
1208
1209 static struct cm_id_private * cm_match_req(struct cm_work *work,
1210                                            struct cm_id_private *cm_id_priv)
1211 {
1212         struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv;
1213         struct cm_timewait_info *timewait_info;
1214         struct cm_req_msg *req_msg;
1215         unsigned long flags;
1216
1217         req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1218
1219         /* Check for duplicate REQ and stale connections. */
1220         spin_lock_irqsave(&cm.lock, flags);
1221         timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info);
1222         if (!timewait_info)
1223                 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
1224
1225         if (timewait_info) {
1226                 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
1227                                            timewait_info->work.remote_id);
1228                 spin_unlock_irqrestore(&cm.lock, flags);
1229                 if (cur_cm_id_priv) {
1230                         cm_dup_req_handler(work, cur_cm_id_priv);
1231                         cm_deref_id(cur_cm_id_priv);
1232                 } else
1233                         cm_issue_rej(work->port, work->mad_recv_wc,
1234                                      IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
1235                                      NULL, 0);
1236                 goto error;
1237         }
1238
1239         /* Find matching listen request. */
1240         listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device,
1241                                            req_msg->service_id);
1242         if (!listen_cm_id_priv) {
1243                 spin_unlock_irqrestore(&cm.lock, flags);
1244                 cm_issue_rej(work->port, work->mad_recv_wc,
1245                              IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ,
1246                              NULL, 0);
1247                 goto error;
1248         }
1249         atomic_inc(&listen_cm_id_priv->refcount);
1250         atomic_inc(&cm_id_priv->refcount);
1251         cm_id_priv->id.state = IB_CM_REQ_RCVD;
1252         atomic_inc(&cm_id_priv->work_count);
1253         spin_unlock_irqrestore(&cm.lock, flags);
1254         return listen_cm_id_priv;
1255
1256 error:  cm_cleanup_timewait(cm_id_priv->timewait_info);
1257         return NULL;
1258 }
1259
1260 static int cm_req_handler(struct cm_work *work)
1261 {
1262         struct ib_cm_id *cm_id;
1263         struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
1264         struct cm_req_msg *req_msg;
1265         int ret;
1266
1267         req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1268
1269         cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL);
1270         if (IS_ERR(cm_id))
1271                 return PTR_ERR(cm_id);
1272
1273         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1274         cm_id_priv->id.remote_id = req_msg->local_comm_id;
1275         cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
1276                                 &cm_id_priv->av);
1277         cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1278                                                             id.local_id);
1279         if (IS_ERR(cm_id_priv->timewait_info)) {
1280                 ret = PTR_ERR(cm_id_priv->timewait_info);
1281                 goto error1;
1282         }
1283         cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id;
1284         cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid;
1285         cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg);
1286
1287         listen_cm_id_priv = cm_match_req(work, cm_id_priv);
1288         if (!listen_cm_id_priv) {
1289                 ret = -EINVAL;
1290                 goto error2;
1291         }
1292
1293         cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
1294         cm_id_priv->id.context = listen_cm_id_priv->id.context;
1295         cm_id_priv->id.service_id = req_msg->service_id;
1296         cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL);
1297
1298         cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]);
1299         ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av);
1300         if (ret)
1301                 goto error3;
1302         if (req_msg->alt_local_lid) {
1303                 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av);
1304                 if (ret)
1305                         goto error3;
1306         }
1307         cm_id_priv->tid = req_msg->hdr.tid;
1308         cm_id_priv->timeout_ms = cm_convert_to_ms(
1309                                         cm_req_get_local_resp_timeout(req_msg));
1310         cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg);
1311         cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg);
1312         cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg);
1313         cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg);
1314         cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg);
1315         cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg);
1316         cm_id_priv->local_ack_timeout =
1317                                 cm_req_get_primary_local_ack_timeout(req_msg);
1318         cm_id_priv->retry_count = cm_req_get_retry_count(req_msg);
1319         cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1320         cm_id_priv->qp_type = cm_req_get_qp_type(req_msg);
1321
1322         cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
1323         cm_process_work(cm_id_priv, work);
1324         cm_deref_id(listen_cm_id_priv);
1325         return 0;
1326
1327 error3: atomic_dec(&cm_id_priv->refcount);
1328         cm_deref_id(listen_cm_id_priv);
1329         cm_cleanup_timewait(cm_id_priv->timewait_info);
1330 error2: kfree(cm_id_priv->timewait_info);
1331         cm_id_priv->timewait_info = NULL;
1332 error1: ib_destroy_cm_id(&cm_id_priv->id);
1333         return ret;
1334 }
1335
1336 static void cm_format_rep(struct cm_rep_msg *rep_msg,
1337                           struct cm_id_private *cm_id_priv,
1338                           struct ib_cm_rep_param *param)
1339 {
1340         cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid);
1341         rep_msg->local_comm_id = cm_id_priv->id.local_id;
1342         rep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1343         cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num));
1344         cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn));
1345         rep_msg->resp_resources = param->responder_resources;
1346         rep_msg->initiator_depth = param->initiator_depth;
1347         cm_rep_set_target_ack_delay(rep_msg, param->target_ack_delay);
1348         cm_rep_set_failover(rep_msg, param->failover_accepted);
1349         cm_rep_set_flow_ctrl(rep_msg, param->flow_control);
1350         cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count);
1351         cm_rep_set_srq(rep_msg, param->srq);
1352         rep_msg->local_ca_guid = cm_id_priv->av.port->cm_dev->ca_guid;
1353
1354         if (param->private_data && param->private_data_len)
1355                 memcpy(rep_msg->private_data, param->private_data,
1356                        param->private_data_len);
1357 }
1358
1359 int ib_send_cm_rep(struct ib_cm_id *cm_id,
1360                    struct ib_cm_rep_param *param)
1361 {
1362         struct cm_id_private *cm_id_priv;
1363         struct ib_mad_send_buf *msg;
1364         struct cm_rep_msg *rep_msg;
1365         unsigned long flags;
1366         int ret;
1367
1368         if (param->private_data &&
1369             param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE)
1370                 return -EINVAL;
1371
1372         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1373         spin_lock_irqsave(&cm_id_priv->lock, flags);
1374         if (cm_id->state != IB_CM_REQ_RCVD &&
1375             cm_id->state != IB_CM_MRA_REQ_SENT) {
1376                 ret = -EINVAL;
1377                 goto out;
1378         }
1379
1380         ret = cm_alloc_msg(cm_id_priv, &msg);
1381         if (ret)
1382                 goto out;
1383
1384         rep_msg = (struct cm_rep_msg *) msg->mad;
1385         cm_format_rep(rep_msg, cm_id_priv, param);
1386         msg->timeout_ms = cm_id_priv->timeout_ms;
1387         msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;
1388
1389         ret = ib_post_send_mad(msg, NULL);
1390         if (ret) {
1391                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1392                 cm_free_msg(msg);
1393                 return ret;
1394         }
1395
1396         cm_id->state = IB_CM_REP_SENT;
1397         cm_id_priv->msg = msg;
1398         cm_id_priv->initiator_depth = param->initiator_depth;
1399         cm_id_priv->responder_resources = param->responder_resources;
1400         cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg);
1401         cm_id_priv->local_qpn = cm_rep_get_local_qpn(rep_msg);
1402
1403 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1404         return ret;
1405 }
1406 EXPORT_SYMBOL(ib_send_cm_rep);
1407
1408 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg,
1409                           struct cm_id_private *cm_id_priv,
1410                           const void *private_data,
1411                           u8 private_data_len)
1412 {
1413         cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid);
1414         rtu_msg->local_comm_id = cm_id_priv->id.local_id;
1415         rtu_msg->remote_comm_id = cm_id_priv->id.remote_id;
1416
1417         if (private_data && private_data_len)
1418                 memcpy(rtu_msg->private_data, private_data, private_data_len);
1419 }
1420
1421 int ib_send_cm_rtu(struct ib_cm_id *cm_id,
1422                    const void *private_data,
1423                    u8 private_data_len)
1424 {
1425         struct cm_id_private *cm_id_priv;
1426         struct ib_mad_send_buf *msg;
1427         unsigned long flags;
1428         void *data;
1429         int ret;
1430
1431         if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE)
1432                 return -EINVAL;
1433
1434         data = cm_copy_private_data(private_data, private_data_len);
1435         if (IS_ERR(data))
1436                 return PTR_ERR(data);
1437
1438         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1439         spin_lock_irqsave(&cm_id_priv->lock, flags);
1440         if (cm_id->state != IB_CM_REP_RCVD &&
1441             cm_id->state != IB_CM_MRA_REP_SENT) {
1442                 ret = -EINVAL;
1443                 goto error;
1444         }
1445
1446         ret = cm_alloc_msg(cm_id_priv, &msg);
1447         if (ret)
1448                 goto error;
1449
1450         cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1451                       private_data, private_data_len);
1452
1453         ret = ib_post_send_mad(msg, NULL);
1454         if (ret) {
1455                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1456                 cm_free_msg(msg);
1457                 kfree(data);
1458                 return ret;
1459         }
1460
1461         cm_id->state = IB_CM_ESTABLISHED;
1462         cm_set_private_data(cm_id_priv, data, private_data_len);
1463         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1464         return 0;
1465
1466 error:  spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1467         kfree(data);
1468         return ret;
1469 }
1470 EXPORT_SYMBOL(ib_send_cm_rtu);
1471
1472 static void cm_format_rep_event(struct cm_work *work)
1473 {
1474         struct cm_rep_msg *rep_msg;
1475         struct ib_cm_rep_event_param *param;
1476
1477         rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1478         param = &work->cm_event.param.rep_rcvd;
1479         param->remote_ca_guid = rep_msg->local_ca_guid;
1480         param->remote_qkey = be32_to_cpu(rep_msg->local_qkey);
1481         param->remote_qpn = be32_to_cpu(cm_rep_get_local_qpn(rep_msg));
1482         param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg));
1483         param->responder_resources = rep_msg->initiator_depth;
1484         param->initiator_depth = rep_msg->resp_resources;
1485         param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
1486         param->failover_accepted = cm_rep_get_failover(rep_msg);
1487         param->flow_control = cm_rep_get_flow_ctrl(rep_msg);
1488         param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1489         param->srq = cm_rep_get_srq(rep_msg);
1490         work->cm_event.private_data = &rep_msg->private_data;
1491 }
1492
1493 static void cm_dup_rep_handler(struct cm_work *work)
1494 {
1495         struct cm_id_private *cm_id_priv;
1496         struct cm_rep_msg *rep_msg;
1497         struct ib_mad_send_buf *msg = NULL;
1498         unsigned long flags;
1499         int ret;
1500
1501         rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad;
1502         cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id,
1503                                    rep_msg->local_comm_id);
1504         if (!cm_id_priv)
1505                 return;
1506
1507         ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1508         if (ret)
1509                 goto deref;
1510
1511         spin_lock_irqsave(&cm_id_priv->lock, flags);
1512         if (cm_id_priv->id.state == IB_CM_ESTABLISHED)
1513                 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1514                               cm_id_priv->private_data,
1515                               cm_id_priv->private_data_len);
1516         else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT)
1517                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1518                               CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout,
1519                               cm_id_priv->private_data,
1520                               cm_id_priv->private_data_len);
1521         else
1522                 goto unlock;
1523         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1524
1525         ret = ib_post_send_mad(msg, NULL);
1526         if (ret)
1527                 goto free;
1528         goto deref;
1529
1530 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1531 free:   cm_free_msg(msg);
1532 deref:  cm_deref_id(cm_id_priv);
1533 }
1534
1535 static int cm_rep_handler(struct cm_work *work)
1536 {
1537         struct cm_id_private *cm_id_priv;
1538         struct cm_rep_msg *rep_msg;
1539         unsigned long flags;
1540         int ret;
1541
1542         rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1543         cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0);
1544         if (!cm_id_priv) {
1545                 cm_dup_rep_handler(work);
1546                 return -EINVAL;
1547         }
1548
1549         cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id;
1550         cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid;
1551         cm_id_priv->timewait_info->remote_qpn = cm_rep_get_local_qpn(rep_msg);
1552
1553         spin_lock_irqsave(&cm.lock, flags);
1554         /* Check for duplicate REP. */
1555         if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
1556                 spin_unlock_irqrestore(&cm.lock, flags);
1557                 ret = -EINVAL;
1558                 goto error;
1559         }
1560         /* Check for a stale connection. */
1561         if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) {
1562                 spin_unlock_irqrestore(&cm.lock, flags);
1563                 cm_issue_rej(work->port, work->mad_recv_wc,
1564                              IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP,
1565                              NULL, 0);
1566                 ret = -EINVAL;
1567                 goto error;
1568         }
1569         spin_unlock_irqrestore(&cm.lock, flags);
1570
1571         cm_format_rep_event(work);
1572
1573         spin_lock_irqsave(&cm_id_priv->lock, flags);
1574         switch (cm_id_priv->id.state) {
1575         case IB_CM_REQ_SENT:
1576         case IB_CM_MRA_REQ_RCVD:
1577                 break;
1578         default:
1579                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1580                 ret = -EINVAL;
1581                 goto error;
1582         }
1583         cm_id_priv->id.state = IB_CM_REP_RCVD;
1584         cm_id_priv->id.remote_id = rep_msg->local_comm_id;
1585         cm_id_priv->remote_qpn = cm_rep_get_local_qpn(rep_msg);
1586         cm_id_priv->initiator_depth = rep_msg->resp_resources;
1587         cm_id_priv->responder_resources = rep_msg->initiator_depth;
1588         cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg);
1589         cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1590
1591         /* todo: handle peer_to_peer */
1592
1593         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1594         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1595         if (!ret)
1596                 list_add_tail(&work->list, &cm_id_priv->work_list);
1597         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1598
1599         if (ret)
1600                 cm_process_work(cm_id_priv, work);
1601         else
1602                 cm_deref_id(cm_id_priv);
1603         return 0;
1604
1605 error:  cm_cleanup_timewait(cm_id_priv->timewait_info);
1606         cm_deref_id(cm_id_priv);
1607         return ret;
1608 }
1609
1610 static int cm_establish_handler(struct cm_work *work)
1611 {
1612         struct cm_id_private *cm_id_priv;
1613         unsigned long flags;
1614         int ret;
1615
1616         /* See comment in ib_cm_establish about lookup. */
1617         cm_id_priv = cm_acquire_id(work->local_id, work->remote_id);
1618         if (!cm_id_priv)
1619                 return -EINVAL;
1620
1621         spin_lock_irqsave(&cm_id_priv->lock, flags);
1622         if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
1623                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1624                 goto out;
1625         }
1626
1627         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1628         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1629         if (!ret)
1630                 list_add_tail(&work->list, &cm_id_priv->work_list);
1631         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1632
1633         if (ret)
1634                 cm_process_work(cm_id_priv, work);
1635         else
1636                 cm_deref_id(cm_id_priv);
1637         return 0;
1638 out:
1639         cm_deref_id(cm_id_priv);
1640         return -EINVAL;
1641 }
1642
1643 static int cm_rtu_handler(struct cm_work *work)
1644 {
1645         struct cm_id_private *cm_id_priv;
1646         struct cm_rtu_msg *rtu_msg;
1647         unsigned long flags;
1648         int ret;
1649
1650         rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad;
1651         cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id,
1652                                    rtu_msg->local_comm_id);
1653         if (!cm_id_priv)
1654                 return -EINVAL;
1655
1656         work->cm_event.private_data = &rtu_msg->private_data;
1657
1658         spin_lock_irqsave(&cm_id_priv->lock, flags);
1659         if (cm_id_priv->id.state != IB_CM_REP_SENT &&
1660             cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
1661                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1662                 goto out;
1663         }
1664         cm_id_priv->id.state = IB_CM_ESTABLISHED;
1665
1666         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1667         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1668         if (!ret)
1669                 list_add_tail(&work->list, &cm_id_priv->work_list);
1670         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1671
1672         if (ret)
1673                 cm_process_work(cm_id_priv, work);
1674         else
1675                 cm_deref_id(cm_id_priv);
1676         return 0;
1677 out:
1678         cm_deref_id(cm_id_priv);
1679         return -EINVAL;
1680 }
1681
1682 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg,
1683                           struct cm_id_private *cm_id_priv,
1684                           const void *private_data,
1685                           u8 private_data_len)
1686 {
1687         cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID,
1688                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ));
1689         dreq_msg->local_comm_id = cm_id_priv->id.local_id;
1690         dreq_msg->remote_comm_id = cm_id_priv->id.remote_id;
1691         cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn);
1692
1693         if (private_data && private_data_len)
1694                 memcpy(dreq_msg->private_data, private_data, private_data_len);
1695 }
1696
1697 int ib_send_cm_dreq(struct ib_cm_id *cm_id,
1698                     const void *private_data,
1699                     u8 private_data_len)
1700 {
1701         struct cm_id_private *cm_id_priv;
1702         struct ib_mad_send_buf *msg;
1703         unsigned long flags;
1704         int ret;
1705
1706         if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE)
1707                 return -EINVAL;
1708
1709         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1710         spin_lock_irqsave(&cm_id_priv->lock, flags);
1711         if (cm_id->state != IB_CM_ESTABLISHED) {
1712                 ret = -EINVAL;
1713                 goto out;
1714         }
1715
1716         ret = cm_alloc_msg(cm_id_priv, &msg);
1717         if (ret) {
1718                 cm_enter_timewait(cm_id_priv);
1719                 goto out;
1720         }
1721
1722         cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv,
1723                        private_data, private_data_len);
1724         msg->timeout_ms = cm_id_priv->timeout_ms;
1725         msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
1726
1727         ret = ib_post_send_mad(msg, NULL);
1728         if (ret) {
1729                 cm_enter_timewait(cm_id_priv);
1730                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1731                 cm_free_msg(msg);
1732                 return ret;
1733         }
1734
1735         cm_id->state = IB_CM_DREQ_SENT;
1736         cm_id_priv->msg = msg;
1737 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1738         return ret;
1739 }
1740 EXPORT_SYMBOL(ib_send_cm_dreq);
1741
1742 static void cm_format_drep(struct cm_drep_msg *drep_msg,
1743                           struct cm_id_private *cm_id_priv,
1744                           const void *private_data,
1745                           u8 private_data_len)
1746 {
1747         cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid);
1748         drep_msg->local_comm_id = cm_id_priv->id.local_id;
1749         drep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1750
1751         if (private_data && private_data_len)
1752                 memcpy(drep_msg->private_data, private_data, private_data_len);
1753 }
1754
1755 int ib_send_cm_drep(struct ib_cm_id *cm_id,
1756                     const void *private_data,
1757                     u8 private_data_len)
1758 {
1759         struct cm_id_private *cm_id_priv;
1760         struct ib_mad_send_buf *msg;
1761         unsigned long flags;
1762         void *data;
1763         int ret;
1764
1765         if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
1766                 return -EINVAL;
1767
1768         data = cm_copy_private_data(private_data, private_data_len);
1769         if (IS_ERR(data))
1770                 return PTR_ERR(data);
1771
1772         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1773         spin_lock_irqsave(&cm_id_priv->lock, flags);
1774         if (cm_id->state != IB_CM_DREQ_RCVD) {
1775                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1776                 kfree(data);
1777                 return -EINVAL;
1778         }
1779
1780         cm_set_private_data(cm_id_priv, data, private_data_len);
1781         cm_enter_timewait(cm_id_priv);
1782
1783         ret = cm_alloc_msg(cm_id_priv, &msg);
1784         if (ret)
1785                 goto out;
1786
1787         cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
1788                        private_data, private_data_len);
1789
1790         ret = ib_post_send_mad(msg, NULL);
1791         if (ret) {
1792                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1793                 cm_free_msg(msg);
1794                 return ret;
1795         }
1796
1797 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1798         return ret;
1799 }
1800 EXPORT_SYMBOL(ib_send_cm_drep);
1801
1802 static int cm_dreq_handler(struct cm_work *work)
1803 {
1804         struct cm_id_private *cm_id_priv;
1805         struct cm_dreq_msg *dreq_msg;
1806         struct ib_mad_send_buf *msg = NULL;
1807         unsigned long flags;
1808         int ret;
1809
1810         dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
1811         cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id,
1812                                    dreq_msg->local_comm_id);
1813         if (!cm_id_priv)
1814                 return -EINVAL;
1815
1816         work->cm_event.private_data = &dreq_msg->private_data;
1817
1818         spin_lock_irqsave(&cm_id_priv->lock, flags);
1819         if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg))
1820                 goto unlock;
1821
1822         switch (cm_id_priv->id.state) {
1823         case IB_CM_REP_SENT:
1824         case IB_CM_DREQ_SENT:
1825                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1826                 break;
1827         case IB_CM_ESTABLISHED:
1828         case IB_CM_MRA_REP_RCVD:
1829                 break;
1830         case IB_CM_TIMEWAIT:
1831                 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
1832                         goto unlock;
1833
1834                 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
1835                                cm_id_priv->private_data,
1836                                cm_id_priv->private_data_len);
1837                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1838
1839                 if (ib_post_send_mad(msg, NULL))
1840                         cm_free_msg(msg);
1841                 goto deref;
1842         default:
1843                 goto unlock;
1844         }
1845         cm_id_priv->id.state = IB_CM_DREQ_RCVD;
1846         cm_id_priv->tid = dreq_msg->hdr.tid;
1847         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1848         if (!ret)
1849                 list_add_tail(&work->list, &cm_id_priv->work_list);
1850         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1851
1852         if (ret)
1853                 cm_process_work(cm_id_priv, work);
1854         else
1855                 cm_deref_id(cm_id_priv);
1856         return 0;
1857
1858 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1859 deref:  cm_deref_id(cm_id_priv);
1860         return -EINVAL;
1861 }
1862
1863 static int cm_drep_handler(struct cm_work *work)
1864 {
1865         struct cm_id_private *cm_id_priv;
1866         struct cm_drep_msg *drep_msg;
1867         unsigned long flags;
1868         int ret;
1869
1870         drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
1871         cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id,
1872                                    drep_msg->local_comm_id);
1873         if (!cm_id_priv)
1874                 return -EINVAL;
1875
1876         work->cm_event.private_data = &drep_msg->private_data;
1877
1878         spin_lock_irqsave(&cm_id_priv->lock, flags);
1879         if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
1880             cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
1881                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1882                 goto out;
1883         }
1884         cm_enter_timewait(cm_id_priv);
1885
1886         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1887         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1888         if (!ret)
1889                 list_add_tail(&work->list, &cm_id_priv->work_list);
1890         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1891
1892         if (ret)
1893                 cm_process_work(cm_id_priv, work);
1894         else
1895                 cm_deref_id(cm_id_priv);
1896         return 0;
1897 out:
1898         cm_deref_id(cm_id_priv);
1899         return -EINVAL;
1900 }
1901
1902 int ib_send_cm_rej(struct ib_cm_id *cm_id,
1903                    enum ib_cm_rej_reason reason,
1904                    void *ari,
1905                    u8 ari_length,
1906                    const void *private_data,
1907                    u8 private_data_len)
1908 {
1909         struct cm_id_private *cm_id_priv;
1910         struct ib_mad_send_buf *msg;
1911         unsigned long flags;
1912         int ret;
1913
1914         if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
1915             (ari && ari_length > IB_CM_REJ_ARI_LENGTH))
1916                 return -EINVAL;
1917
1918         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1919
1920         spin_lock_irqsave(&cm_id_priv->lock, flags);
1921         switch (cm_id->state) {
1922         case IB_CM_REQ_SENT:
1923         case IB_CM_MRA_REQ_RCVD:
1924         case IB_CM_REQ_RCVD:
1925         case IB_CM_MRA_REQ_SENT:
1926         case IB_CM_REP_RCVD:
1927         case IB_CM_MRA_REP_SENT:
1928                 ret = cm_alloc_msg(cm_id_priv, &msg);
1929                 if (!ret)
1930                         cm_format_rej((struct cm_rej_msg *) msg->mad,
1931                                       cm_id_priv, reason, ari, ari_length,
1932                                       private_data, private_data_len);
1933
1934                 cm_reset_to_idle(cm_id_priv);
1935                 break;
1936         case IB_CM_REP_SENT:
1937         case IB_CM_MRA_REP_RCVD:
1938                 ret = cm_alloc_msg(cm_id_priv, &msg);
1939                 if (!ret)
1940                         cm_format_rej((struct cm_rej_msg *) msg->mad,
1941                                       cm_id_priv, reason, ari, ari_length,
1942                                       private_data, private_data_len);
1943
1944                 cm_enter_timewait(cm_id_priv);
1945                 break;
1946         default:
1947                 ret = -EINVAL;
1948                 goto out;
1949         }
1950
1951         if (ret)
1952                 goto out;
1953
1954         ret = ib_post_send_mad(msg, NULL);
1955         if (ret)
1956                 cm_free_msg(msg);
1957
1958 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1959         return ret;
1960 }
1961 EXPORT_SYMBOL(ib_send_cm_rej);
1962
1963 static void cm_format_rej_event(struct cm_work *work)
1964 {
1965         struct cm_rej_msg *rej_msg;
1966         struct ib_cm_rej_event_param *param;
1967
1968         rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
1969         param = &work->cm_event.param.rej_rcvd;
1970         param->ari = rej_msg->ari;
1971         param->ari_length = cm_rej_get_reject_info_len(rej_msg);
1972         param->reason = __be16_to_cpu(rej_msg->reason);
1973         work->cm_event.private_data = &rej_msg->private_data;
1974 }
1975
1976 static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
1977 {
1978         struct cm_timewait_info *timewait_info;
1979         struct cm_id_private *cm_id_priv;
1980         unsigned long flags;
1981         __be32 remote_id;
1982
1983         remote_id = rej_msg->local_comm_id;
1984
1985         if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) {
1986                 spin_lock_irqsave(&cm.lock, flags);
1987                 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari),
1988                                                   remote_id);
1989                 if (!timewait_info) {
1990                         spin_unlock_irqrestore(&cm.lock, flags);
1991                         return NULL;
1992                 }
1993                 cm_id_priv = idr_find(&cm.local_id_table,
1994                                       (__force int) timewait_info->work.local_id);
1995                 if (cm_id_priv) {
1996                         if (cm_id_priv->id.remote_id == remote_id)
1997                                 atomic_inc(&cm_id_priv->refcount);
1998                         else
1999                                 cm_id_priv = NULL;
2000                 }
2001                 spin_unlock_irqrestore(&cm.lock, flags);
2002         } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ)
2003                 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0);
2004         else
2005                 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id);
2006
2007         return cm_id_priv;
2008 }
2009
2010 static int cm_rej_handler(struct cm_work *work)
2011 {
2012         struct cm_id_private *cm_id_priv;
2013         struct cm_rej_msg *rej_msg;
2014         unsigned long flags;
2015         int ret;
2016
2017         rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2018         cm_id_priv = cm_acquire_rejected_id(rej_msg);
2019         if (!cm_id_priv)
2020                 return -EINVAL;
2021
2022         cm_format_rej_event(work);
2023
2024         spin_lock_irqsave(&cm_id_priv->lock, flags);
2025         switch (cm_id_priv->id.state) {
2026         case IB_CM_REQ_SENT:
2027         case IB_CM_MRA_REQ_RCVD:
2028         case IB_CM_REP_SENT:
2029         case IB_CM_MRA_REP_RCVD:
2030                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2031                 /* fall through */
2032         case IB_CM_REQ_RCVD:
2033         case IB_CM_MRA_REQ_SENT:
2034                 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN)
2035                         cm_enter_timewait(cm_id_priv);
2036                 else
2037                         cm_reset_to_idle(cm_id_priv);
2038                 break;
2039         case IB_CM_DREQ_SENT:
2040                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2041                 /* fall through */
2042         case IB_CM_REP_RCVD:
2043         case IB_CM_MRA_REP_SENT:
2044         case IB_CM_ESTABLISHED:
2045                 cm_enter_timewait(cm_id_priv);
2046                 break;
2047         default:
2048                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2049                 ret = -EINVAL;
2050                 goto out;
2051         }
2052
2053         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2054         if (!ret)
2055                 list_add_tail(&work->list, &cm_id_priv->work_list);
2056         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2057
2058         if (ret)
2059                 cm_process_work(cm_id_priv, work);
2060         else
2061                 cm_deref_id(cm_id_priv);
2062         return 0;
2063 out:
2064         cm_deref_id(cm_id_priv);
2065         return -EINVAL;
2066 }
2067
2068 int ib_send_cm_mra(struct ib_cm_id *cm_id,
2069                    u8 service_timeout,
2070                    const void *private_data,
2071                    u8 private_data_len)
2072 {
2073         struct cm_id_private *cm_id_priv;
2074         struct ib_mad_send_buf *msg;
2075         void *data;
2076         unsigned long flags;
2077         int ret;
2078
2079         if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE)
2080                 return -EINVAL;
2081
2082         data = cm_copy_private_data(private_data, private_data_len);
2083         if (IS_ERR(data))
2084                 return PTR_ERR(data);
2085
2086         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2087
2088         spin_lock_irqsave(&cm_id_priv->lock, flags);
2089         switch(cm_id_priv->id.state) {
2090         case IB_CM_REQ_RCVD:
2091                 ret = cm_alloc_msg(cm_id_priv, &msg);
2092                 if (ret)
2093                         goto error1;
2094
2095                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2096                               CM_MSG_RESPONSE_REQ, service_timeout,
2097                               private_data, private_data_len);
2098                 ret = ib_post_send_mad(msg, NULL);
2099                 if (ret)
2100                         goto error2;
2101                 cm_id->state = IB_CM_MRA_REQ_SENT;
2102                 break;
2103         case IB_CM_REP_RCVD:
2104                 ret = cm_alloc_msg(cm_id_priv, &msg);
2105                 if (ret)
2106                         goto error1;
2107
2108                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2109                               CM_MSG_RESPONSE_REP, service_timeout,
2110                               private_data, private_data_len);
2111                 ret = ib_post_send_mad(msg, NULL);
2112                 if (ret)
2113                         goto error2;
2114                 cm_id->state = IB_CM_MRA_REP_SENT;
2115                 break;
2116         case IB_CM_ESTABLISHED:
2117                 ret = cm_alloc_msg(cm_id_priv, &msg);
2118                 if (ret)
2119                         goto error1;
2120
2121                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2122                               CM_MSG_RESPONSE_OTHER, service_timeout,
2123                               private_data, private_data_len);
2124                 ret = ib_post_send_mad(msg, NULL);
2125                 if (ret)
2126                         goto error2;
2127                 cm_id->lap_state = IB_CM_MRA_LAP_SENT;
2128                 break;
2129         default:
2130                 ret = -EINVAL;
2131                 goto error1;
2132         }
2133         cm_id_priv->service_timeout = service_timeout;
2134         cm_set_private_data(cm_id_priv, data, private_data_len);
2135         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2136         return 0;
2137
2138 error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2139         kfree(data);
2140         return ret;
2141
2142 error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2143         kfree(data);
2144         cm_free_msg(msg);
2145         return ret;
2146 }
2147 EXPORT_SYMBOL(ib_send_cm_mra);
2148
2149 static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
2150 {
2151         switch (cm_mra_get_msg_mraed(mra_msg)) {
2152         case CM_MSG_RESPONSE_REQ:
2153                 return cm_acquire_id(mra_msg->remote_comm_id, 0);
2154         case CM_MSG_RESPONSE_REP:
2155         case CM_MSG_RESPONSE_OTHER:
2156                 return cm_acquire_id(mra_msg->remote_comm_id,
2157                                      mra_msg->local_comm_id);
2158         default:
2159                 return NULL;
2160         }
2161 }
2162
2163 static int cm_mra_handler(struct cm_work *work)
2164 {
2165         struct cm_id_private *cm_id_priv;
2166         struct cm_mra_msg *mra_msg;
2167         unsigned long flags;
2168         int timeout, ret;
2169
2170         mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
2171         cm_id_priv = cm_acquire_mraed_id(mra_msg);
2172         if (!cm_id_priv)
2173                 return -EINVAL;
2174
2175         work->cm_event.private_data = &mra_msg->private_data;
2176         work->cm_event.param.mra_rcvd.service_timeout =
2177                                         cm_mra_get_service_timeout(mra_msg);
2178         timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) +
2179                   cm_convert_to_ms(cm_id_priv->av.packet_life_time);
2180
2181         spin_lock_irqsave(&cm_id_priv->lock, flags);
2182         switch (cm_id_priv->id.state) {
2183         case IB_CM_REQ_SENT:
2184                 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ ||
2185                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
2186                                   cm_id_priv->msg, timeout))
2187                         goto out;
2188                 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
2189                 break;
2190         case IB_CM_REP_SENT:
2191                 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP ||
2192                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
2193                                   cm_id_priv->msg, timeout))
2194                         goto out;
2195                 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
2196                 break;
2197         case IB_CM_ESTABLISHED:
2198                 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER ||
2199                     cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
2200                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
2201                                   cm_id_priv->msg, timeout))
2202                         goto out;
2203                 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
2204                 break;
2205         default:
2206                 goto out;
2207         }
2208
2209         cm_id_priv->msg->context[1] = (void *) (unsigned long)
2210                                       cm_id_priv->id.state;
2211         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2212         if (!ret)
2213                 list_add_tail(&work->list, &cm_id_priv->work_list);
2214         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2215
2216         if (ret)
2217                 cm_process_work(cm_id_priv, work);
2218         else
2219                 cm_deref_id(cm_id_priv);
2220         return 0;
2221 out:
2222         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2223         cm_deref_id(cm_id_priv);
2224         return -EINVAL;
2225 }
2226
2227 static void cm_format_lap(struct cm_lap_msg *lap_msg,
2228                           struct cm_id_private *cm_id_priv,
2229                           struct ib_sa_path_rec *alternate_path,
2230                           const void *private_data,
2231                           u8 private_data_len)
2232 {
2233         cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID,
2234                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP));
2235         lap_msg->local_comm_id = cm_id_priv->id.local_id;
2236         lap_msg->remote_comm_id = cm_id_priv->id.remote_id;
2237         cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn);
2238         /* todo: need remote CM response timeout */
2239         cm_lap_set_remote_resp_timeout(lap_msg, 0x1F);
2240         lap_msg->alt_local_lid = alternate_path->slid;
2241         lap_msg->alt_remote_lid = alternate_path->dlid;
2242         lap_msg->alt_local_gid = alternate_path->sgid;
2243         lap_msg->alt_remote_gid = alternate_path->dgid;
2244         cm_lap_set_flow_label(lap_msg, alternate_path->flow_label);
2245         cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class);
2246         lap_msg->alt_hop_limit = alternate_path->hop_limit;
2247         cm_lap_set_packet_rate(lap_msg, alternate_path->rate);
2248         cm_lap_set_sl(lap_msg, alternate_path->sl);
2249         cm_lap_set_subnet_local(lap_msg, 1); /* local only... */
2250         cm_lap_set_local_ack_timeout(lap_msg,
2251                 min(31, alternate_path->packet_life_time + 1));
2252
2253         if (private_data && private_data_len)
2254                 memcpy(lap_msg->private_data, private_data, private_data_len);
2255 }
2256
2257 int ib_send_cm_lap(struct ib_cm_id *cm_id,
2258                    struct ib_sa_path_rec *alternate_path,
2259                    const void *private_data,
2260                    u8 private_data_len)
2261 {
2262         struct cm_id_private *cm_id_priv;
2263         struct ib_mad_send_buf *msg;
2264         unsigned long flags;
2265         int ret;
2266
2267         if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE)
2268                 return -EINVAL;
2269
2270         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2271         spin_lock_irqsave(&cm_id_priv->lock, flags);
2272         if (cm_id->state != IB_CM_ESTABLISHED ||
2273             cm_id->lap_state != IB_CM_LAP_IDLE) {
2274                 ret = -EINVAL;
2275                 goto out;
2276         }
2277
2278         ret = cm_alloc_msg(cm_id_priv, &msg);
2279         if (ret)
2280                 goto out;
2281
2282         cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv,
2283                       alternate_path, private_data, private_data_len);
2284         msg->timeout_ms = cm_id_priv->timeout_ms;
2285         msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED;
2286
2287         ret = ib_post_send_mad(msg, NULL);
2288         if (ret) {
2289                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2290                 cm_free_msg(msg);
2291                 return ret;
2292         }
2293
2294         cm_id->lap_state = IB_CM_LAP_SENT;
2295         cm_id_priv->msg = msg;
2296
2297 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2298         return ret;
2299 }
2300 EXPORT_SYMBOL(ib_send_cm_lap);
2301
2302 static void cm_format_path_from_lap(struct ib_sa_path_rec *path,
2303                                     struct cm_lap_msg *lap_msg)
2304 {
2305         memset(path, 0, sizeof *path);
2306         path->dgid = lap_msg->alt_local_gid;
2307         path->sgid = lap_msg->alt_remote_gid;
2308         path->dlid = lap_msg->alt_local_lid;
2309         path->slid = lap_msg->alt_remote_lid;
2310         path->flow_label = cm_lap_get_flow_label(lap_msg);
2311         path->hop_limit = lap_msg->alt_hop_limit;
2312         path->traffic_class = cm_lap_get_traffic_class(lap_msg);
2313         path->reversible = 1;
2314         /* pkey is same as in REQ */
2315         path->sl = cm_lap_get_sl(lap_msg);
2316         path->mtu_selector = IB_SA_EQ;
2317         /* mtu is same as in REQ */
2318         path->rate_selector = IB_SA_EQ;
2319         path->rate = cm_lap_get_packet_rate(lap_msg);
2320         path->packet_life_time_selector = IB_SA_EQ;
2321         path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg);
2322         path->packet_life_time -= (path->packet_life_time > 0);
2323 }
2324
2325 static int cm_lap_handler(struct cm_work *work)
2326 {
2327         struct cm_id_private *cm_id_priv;
2328         struct cm_lap_msg *lap_msg;
2329         struct ib_cm_lap_event_param *param;
2330         struct ib_mad_send_buf *msg = NULL;
2331         unsigned long flags;
2332         int ret;
2333
2334         /* todo: verify LAP request and send reject APR if invalid. */
2335         lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
2336         cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id,
2337                                    lap_msg->local_comm_id);
2338         if (!cm_id_priv)
2339                 return -EINVAL;
2340
2341         param = &work->cm_event.param.lap_rcvd;
2342         param->alternate_path = &work->path[0];
2343         cm_format_path_from_lap(param->alternate_path, lap_msg);
2344         work->cm_event.private_data = &lap_msg->private_data;
2345
2346         spin_lock_irqsave(&cm_id_priv->lock, flags);
2347         if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
2348                 goto unlock;
2349
2350         switch (cm_id_priv->id.lap_state) {
2351         case IB_CM_LAP_IDLE:
2352                 break;
2353         case IB_CM_MRA_LAP_SENT:
2354                 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2355                         goto unlock;
2356
2357                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2358                               CM_MSG_RESPONSE_OTHER,
2359                               cm_id_priv->service_timeout,
2360                               cm_id_priv->private_data,
2361                               cm_id_priv->private_data_len);
2362                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2363
2364                 if (ib_post_send_mad(msg, NULL))
2365                         cm_free_msg(msg);
2366                 goto deref;
2367         default:
2368                 goto unlock;
2369         }
2370
2371         cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
2372         cm_id_priv->tid = lap_msg->hdr.tid;
2373         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2374         if (!ret)
2375                 list_add_tail(&work->list, &cm_id_priv->work_list);
2376         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2377
2378         if (ret)
2379                 cm_process_work(cm_id_priv, work);
2380         else
2381                 cm_deref_id(cm_id_priv);
2382         return 0;
2383
2384 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2385 deref:  cm_deref_id(cm_id_priv);
2386         return -EINVAL;
2387 }
2388
2389 static void cm_format_apr(struct cm_apr_msg *apr_msg,
2390                           struct cm_id_private *cm_id_priv,
2391                           enum ib_cm_apr_status status,
2392                           void *info,
2393                           u8 info_length,
2394                           const void *private_data,
2395                           u8 private_data_len)
2396 {
2397         cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid);
2398         apr_msg->local_comm_id = cm_id_priv->id.local_id;
2399         apr_msg->remote_comm_id = cm_id_priv->id.remote_id;
2400         apr_msg->ap_status = (u8) status;
2401
2402         if (info && info_length) {
2403                 apr_msg->info_length = info_length;
2404                 memcpy(apr_msg->info, info, info_length);
2405         }
2406
2407         if (private_data && private_data_len)
2408                 memcpy(apr_msg->private_data, private_data, private_data_len);
2409 }
2410
2411 int ib_send_cm_apr(struct ib_cm_id *cm_id,
2412                    enum ib_cm_apr_status status,
2413                    void *info,
2414                    u8 info_length,
2415                    const void *private_data,
2416                    u8 private_data_len)
2417 {
2418         struct cm_id_private *cm_id_priv;
2419         struct ib_mad_send_buf *msg;
2420         unsigned long flags;
2421         int ret;
2422
2423         if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) ||
2424             (info && info_length > IB_CM_APR_INFO_LENGTH))
2425                 return -EINVAL;
2426
2427         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2428         spin_lock_irqsave(&cm_id_priv->lock, flags);
2429         if (cm_id->state != IB_CM_ESTABLISHED ||
2430             (cm_id->lap_state != IB_CM_LAP_RCVD &&
2431              cm_id->lap_state != IB_CM_MRA_LAP_SENT)) {
2432                 ret = -EINVAL;
2433                 goto out;
2434         }
2435
2436         ret = cm_alloc_msg(cm_id_priv, &msg);
2437         if (ret)
2438                 goto out;
2439
2440         cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status,
2441                       info, info_length, private_data, private_data_len);
2442         ret = ib_post_send_mad(msg, NULL);
2443         if (ret) {
2444                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2445                 cm_free_msg(msg);
2446                 return ret;
2447         }
2448
2449         cm_id->lap_state = IB_CM_LAP_IDLE;
2450 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2451         return ret;
2452 }
2453 EXPORT_SYMBOL(ib_send_cm_apr);
2454
2455 static int cm_apr_handler(struct cm_work *work)
2456 {
2457         struct cm_id_private *cm_id_priv;
2458         struct cm_apr_msg *apr_msg;
2459         unsigned long flags;
2460         int ret;
2461
2462         apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
2463         cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id,
2464                                    apr_msg->local_comm_id);
2465         if (!cm_id_priv)
2466                 return -EINVAL; /* Unmatched reply. */
2467
2468         work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status;
2469         work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info;
2470         work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length;
2471         work->cm_event.private_data = &apr_msg->private_data;
2472
2473         spin_lock_irqsave(&cm_id_priv->lock, flags);
2474         if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
2475             (cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
2476              cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
2477                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2478                 goto out;
2479         }
2480         cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
2481         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2482         cm_id_priv->msg = NULL;
2483
2484         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2485         if (!ret)
2486                 list_add_tail(&work->list, &cm_id_priv->work_list);
2487         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2488
2489         if (ret)
2490                 cm_process_work(cm_id_priv, work);
2491         else
2492                 cm_deref_id(cm_id_priv);
2493         return 0;
2494 out:
2495         cm_deref_id(cm_id_priv);
2496         return -EINVAL;
2497 }
2498
2499 static int cm_timewait_handler(struct cm_work *work)
2500 {
2501         struct cm_timewait_info *timewait_info;
2502         struct cm_id_private *cm_id_priv;
2503         unsigned long flags;
2504         int ret;
2505
2506         timewait_info = (struct cm_timewait_info *)work;
2507         cm_cleanup_timewait(timewait_info);
2508
2509         cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
2510                                    timewait_info->work.remote_id);
2511         if (!cm_id_priv)
2512                 return -EINVAL;
2513
2514         spin_lock_irqsave(&cm_id_priv->lock, flags);
2515         if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
2516             cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
2517                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2518                 goto out;
2519         }
2520         cm_id_priv->id.state = IB_CM_IDLE;
2521         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2522         if (!ret)
2523                 list_add_tail(&work->list, &cm_id_priv->work_list);
2524         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2525
2526         if (ret)
2527                 cm_process_work(cm_id_priv, work);
2528         else
2529                 cm_deref_id(cm_id_priv);
2530         return 0;
2531 out:
2532         cm_deref_id(cm_id_priv);
2533         return -EINVAL;
2534 }
2535
2536 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
2537                                struct cm_id_private *cm_id_priv,
2538                                struct ib_cm_sidr_req_param *param)
2539 {
2540         cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
2541                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR));
2542         sidr_req_msg->request_id = cm_id_priv->id.local_id;
2543         sidr_req_msg->pkey = cpu_to_be16(param->pkey);
2544         sidr_req_msg->service_id = param->service_id;
2545
2546         if (param->private_data && param->private_data_len)
2547                 memcpy(sidr_req_msg->private_data, param->private_data,
2548                        param->private_data_len);
2549 }
2550
2551 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
2552                         struct ib_cm_sidr_req_param *param)
2553 {
2554         struct cm_id_private *cm_id_priv;
2555         struct ib_mad_send_buf *msg;
2556         unsigned long flags;
2557         int ret;
2558
2559         if (!param->path || (param->private_data &&
2560              param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
2561                 return -EINVAL;
2562
2563         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2564         ret = cm_init_av_by_path(param->path, &cm_id_priv->av);
2565         if (ret)
2566                 goto out;
2567
2568         cm_id->service_id = param->service_id;
2569         cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
2570         cm_id_priv->timeout_ms = param->timeout_ms;
2571         cm_id_priv->max_cm_retries = param->max_cm_retries;
2572         ret = cm_alloc_msg(cm_id_priv, &msg);
2573         if (ret)
2574                 goto out;
2575
2576         cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv,
2577                            param);
2578         msg->timeout_ms = cm_id_priv->timeout_ms;
2579         msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT;
2580
2581         spin_lock_irqsave(&cm_id_priv->lock, flags);
2582         if (cm_id->state == IB_CM_IDLE)
2583                 ret = ib_post_send_mad(msg, NULL);
2584         else
2585                 ret = -EINVAL;
2586
2587         if (ret) {
2588                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2589                 cm_free_msg(msg);
2590                 goto out;
2591         }
2592         cm_id->state = IB_CM_SIDR_REQ_SENT;
2593         cm_id_priv->msg = msg;
2594         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2595 out:
2596         return ret;
2597 }
2598 EXPORT_SYMBOL(ib_send_cm_sidr_req);
2599
2600 static void cm_format_sidr_req_event(struct cm_work *work,
2601                                      struct ib_cm_id *listen_id)
2602 {
2603         struct cm_sidr_req_msg *sidr_req_msg;
2604         struct ib_cm_sidr_req_event_param *param;
2605
2606         sidr_req_msg = (struct cm_sidr_req_msg *)
2607                                 work->mad_recv_wc->recv_buf.mad;
2608         param = &work->cm_event.param.sidr_req_rcvd;
2609         param->pkey = __be16_to_cpu(sidr_req_msg->pkey);
2610         param->listen_id = listen_id;
2611         param->port = work->port->port_num;
2612         work->cm_event.private_data = &sidr_req_msg->private_data;
2613 }
2614
2615 static int cm_sidr_req_handler(struct cm_work *work)
2616 {
2617         struct ib_cm_id *cm_id;
2618         struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
2619         struct cm_sidr_req_msg *sidr_req_msg;
2620         struct ib_wc *wc;
2621         unsigned long flags;
2622
2623         cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL);
2624         if (IS_ERR(cm_id))
2625                 return PTR_ERR(cm_id);
2626         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2627
2628         /* Record SGID/SLID and request ID for lookup. */
2629         sidr_req_msg = (struct cm_sidr_req_msg *)
2630                                 work->mad_recv_wc->recv_buf.mad;
2631         wc = work->mad_recv_wc->wc;
2632         cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid);
2633         cm_id_priv->av.dgid.global.interface_id = 0;
2634         cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2635                                 &cm_id_priv->av);
2636         cm_id_priv->id.remote_id = sidr_req_msg->request_id;
2637         cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
2638         cm_id_priv->tid = sidr_req_msg->hdr.tid;
2639         atomic_inc(&cm_id_priv->work_count);
2640
2641         spin_lock_irqsave(&cm.lock, flags);
2642         cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
2643         if (cur_cm_id_priv) {
2644                 spin_unlock_irqrestore(&cm.lock, flags);
2645                 goto out; /* Duplicate message. */
2646         }
2647         cur_cm_id_priv = cm_find_listen(cm_id->device,
2648                                         sidr_req_msg->service_id);
2649         if (!cur_cm_id_priv) {
2650                 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
2651                 spin_unlock_irqrestore(&cm.lock, flags);
2652                 /* todo: reply with no match */
2653                 goto out; /* No match. */
2654         }
2655         atomic_inc(&cur_cm_id_priv->refcount);
2656         spin_unlock_irqrestore(&cm.lock, flags);
2657
2658         cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler;
2659         cm_id_priv->id.context = cur_cm_id_priv->id.context;
2660         cm_id_priv->id.service_id = sidr_req_msg->service_id;
2661         cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL);
2662
2663         cm_format_sidr_req_event(work, &cur_cm_id_priv->id);
2664         cm_process_work(cm_id_priv, work);
2665         cm_deref_id(cur_cm_id_priv);
2666         return 0;
2667 out:
2668         ib_destroy_cm_id(&cm_id_priv->id);
2669         return -EINVAL;
2670 }
2671
2672 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
2673                                struct cm_id_private *cm_id_priv,
2674                                struct ib_cm_sidr_rep_param *param)
2675 {
2676         cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
2677                           cm_id_priv->tid);
2678         sidr_rep_msg->request_id = cm_id_priv->id.remote_id;
2679         sidr_rep_msg->status = param->status;
2680         cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num));
2681         sidr_rep_msg->service_id = cm_id_priv->id.service_id;
2682         sidr_rep_msg->qkey = cpu_to_be32(param->qkey);
2683
2684         if (param->info && param->info_length)
2685                 memcpy(sidr_rep_msg->info, param->info, param->info_length);
2686
2687         if (param->private_data && param->private_data_len)
2688                 memcpy(sidr_rep_msg->private_data, param->private_data,
2689                        param->private_data_len);
2690 }
2691
2692 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
2693                         struct ib_cm_sidr_rep_param *param)
2694 {
2695         struct cm_id_private *cm_id_priv;
2696         struct ib_mad_send_buf *msg;
2697         unsigned long flags;
2698         int ret;
2699
2700         if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
2701             (param->private_data &&
2702              param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE))
2703                 return -EINVAL;
2704
2705         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2706         spin_lock_irqsave(&cm_id_priv->lock, flags);
2707         if (cm_id->state != IB_CM_SIDR_REQ_RCVD) {
2708                 ret = -EINVAL;
2709                 goto error;
2710         }
2711
2712         ret = cm_alloc_msg(cm_id_priv, &msg);
2713         if (ret)
2714                 goto error;
2715
2716         cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
2717                            param);
2718         ret = ib_post_send_mad(msg, NULL);
2719         if (ret) {
2720                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2721                 cm_free_msg(msg);
2722                 return ret;
2723         }
2724         cm_id->state = IB_CM_IDLE;
2725         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2726
2727         spin_lock_irqsave(&cm.lock, flags);
2728         rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
2729         spin_unlock_irqrestore(&cm.lock, flags);
2730         return 0;
2731
2732 error:  spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2733         return ret;
2734 }
2735 EXPORT_SYMBOL(ib_send_cm_sidr_rep);
2736
2737 static void cm_format_sidr_rep_event(struct cm_work *work)
2738 {
2739         struct cm_sidr_rep_msg *sidr_rep_msg;
2740         struct ib_cm_sidr_rep_event_param *param;
2741
2742         sidr_rep_msg = (struct cm_sidr_rep_msg *)
2743                                 work->mad_recv_wc->recv_buf.mad;
2744         param = &work->cm_event.param.sidr_rep_rcvd;
2745         param->status = sidr_rep_msg->status;
2746         param->qkey = be32_to_cpu(sidr_rep_msg->qkey);
2747         param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg));
2748         param->info = &sidr_rep_msg->info;
2749         param->info_len = sidr_rep_msg->info_length;
2750         work->cm_event.private_data = &sidr_rep_msg->private_data;
2751 }
2752
2753 static int cm_sidr_rep_handler(struct cm_work *work)
2754 {
2755         struct cm_sidr_rep_msg *sidr_rep_msg;
2756         struct cm_id_private *cm_id_priv;
2757         unsigned long flags;
2758
2759         sidr_rep_msg = (struct cm_sidr_rep_msg *)
2760                                 work->mad_recv_wc->recv_buf.mad;
2761         cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0);
2762         if (!cm_id_priv)
2763                 return -EINVAL; /* Unmatched reply. */
2764
2765         spin_lock_irqsave(&cm_id_priv->lock, flags);
2766         if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
2767                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2768                 goto out;
2769         }
2770         cm_id_priv->id.state = IB_CM_IDLE;
2771         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2772         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2773
2774         cm_format_sidr_rep_event(work);
2775         cm_process_work(cm_id_priv, work);
2776         return 0;
2777 out:
2778         cm_deref_id(cm_id_priv);
2779         return -EINVAL;
2780 }
2781
2782 static void cm_process_send_error(struct ib_mad_send_buf *msg,
2783                                   enum ib_wc_status wc_status)
2784 {
2785         struct cm_id_private *cm_id_priv;
2786         struct ib_cm_event cm_event;
2787         enum ib_cm_state state;
2788         unsigned long flags;
2789         int ret;
2790
2791         memset(&cm_event, 0, sizeof cm_event);
2792         cm_id_priv = msg->context[0];
2793
2794         /* Discard old sends or ones without a response. */
2795         spin_lock_irqsave(&cm_id_priv->lock, flags);
2796         state = (enum ib_cm_state) (unsigned long) msg->context[1];
2797         if (msg != cm_id_priv->msg || state != cm_id_priv->id.state)
2798                 goto discard;
2799
2800         switch (state) {
2801         case IB_CM_REQ_SENT:
2802         case IB_CM_MRA_REQ_RCVD:
2803                 cm_reset_to_idle(cm_id_priv);
2804                 cm_event.event = IB_CM_REQ_ERROR;
2805                 break;
2806         case IB_CM_REP_SENT:
2807         case IB_CM_MRA_REP_RCVD:
2808                 cm_reset_to_idle(cm_id_priv);
2809                 cm_event.event = IB_CM_REP_ERROR;
2810                 break;
2811         case IB_CM_DREQ_SENT:
2812                 cm_enter_timewait(cm_id_priv);
2813                 cm_event.event = IB_CM_DREQ_ERROR;
2814                 break;
2815         case IB_CM_SIDR_REQ_SENT:
2816                 cm_id_priv->id.state = IB_CM_IDLE;
2817                 cm_event.event = IB_CM_SIDR_REQ_ERROR;
2818                 break;
2819         default:
2820                 goto discard;
2821         }
2822         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2823         cm_event.param.send_status = wc_status;
2824
2825         /* No other events can occur on the cm_id at this point. */
2826         ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
2827         cm_free_msg(msg);
2828         if (ret)
2829                 ib_destroy_cm_id(&cm_id_priv->id);
2830         return;
2831 discard:
2832         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2833         cm_free_msg(msg);
2834 }
2835
2836 static void cm_send_handler(struct ib_mad_agent *mad_agent,
2837                             struct ib_mad_send_wc *mad_send_wc)
2838 {
2839         struct ib_mad_send_buf *msg = mad_send_wc->send_buf;
2840
2841         switch (mad_send_wc->status) {
2842         case IB_WC_SUCCESS:
2843         case IB_WC_WR_FLUSH_ERR:
2844                 cm_free_msg(msg);
2845                 break;
2846         default:
2847                 if (msg->context[0] && msg->context[1])
2848                         cm_process_send_error(msg, mad_send_wc->status);
2849                 else
2850                         cm_free_msg(msg);
2851                 break;
2852         }
2853 }
2854
2855 static void cm_work_handler(void *data)
2856 {
2857         struct cm_work *work = data;
2858         int ret;
2859
2860         switch (work->cm_event.event) {
2861         case IB_CM_REQ_RECEIVED:
2862                 ret = cm_req_handler(work);
2863                 break;
2864         case IB_CM_MRA_RECEIVED:
2865                 ret = cm_mra_handler(work);
2866                 break;
2867         case IB_CM_REJ_RECEIVED:
2868                 ret = cm_rej_handler(work);
2869                 break;
2870         case IB_CM_REP_RECEIVED:
2871                 ret = cm_rep_handler(work);
2872                 break;
2873         case IB_CM_RTU_RECEIVED:
2874                 ret = cm_rtu_handler(work);
2875                 break;
2876         case IB_CM_USER_ESTABLISHED:
2877                 ret = cm_establish_handler(work);
2878                 break;
2879         case IB_CM_DREQ_RECEIVED:
2880                 ret = cm_dreq_handler(work);
2881                 break;
2882         case IB_CM_DREP_RECEIVED:
2883                 ret = cm_drep_handler(work);
2884                 break;
2885         case IB_CM_SIDR_REQ_RECEIVED:
2886                 ret = cm_sidr_req_handler(work);
2887                 break;
2888         case IB_CM_SIDR_REP_RECEIVED:
2889                 ret = cm_sidr_rep_handler(work);
2890                 break;
2891         case IB_CM_LAP_RECEIVED:
2892                 ret = cm_lap_handler(work);
2893                 break;
2894         case IB_CM_APR_RECEIVED:
2895                 ret = cm_apr_handler(work);
2896                 break;
2897         case IB_CM_TIMEWAIT_EXIT:
2898                 ret = cm_timewait_handler(work);
2899                 break;
2900         default:
2901                 ret = -EINVAL;
2902                 break;
2903         }
2904         if (ret)
2905                 cm_free_work(work);
2906 }
2907
2908 int ib_cm_establish(struct ib_cm_id *cm_id)
2909 {
2910         struct cm_id_private *cm_id_priv;
2911         struct cm_work *work;
2912         unsigned long flags;
2913         int ret = 0;
2914
2915         work = kmalloc(sizeof *work, GFP_ATOMIC);
2916         if (!work)
2917                 return -ENOMEM;
2918
2919         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2920         spin_lock_irqsave(&cm_id_priv->lock, flags);
2921         switch (cm_id->state)
2922         {
2923         case IB_CM_REP_SENT:
2924         case IB_CM_MRA_REP_RCVD:
2925                 cm_id->state = IB_CM_ESTABLISHED;
2926                 break;
2927         case IB_CM_ESTABLISHED:
2928                 ret = -EISCONN;
2929                 break;
2930         default:
2931                 ret = -EINVAL;
2932                 break;
2933         }
2934         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2935
2936         if (ret) {
2937                 kfree(work);
2938                 goto out;
2939         }
2940
2941         /*
2942          * The CM worker thread may try to destroy the cm_id before it
2943          * can execute this work item.  To prevent potential deadlock,
2944          * we need to find the cm_id once we're in the context of the
2945          * worker thread, rather than holding a reference on it.
2946          */
2947         INIT_WORK(&work->work, cm_work_handler, work);
2948         work->local_id = cm_id->local_id;
2949         work->remote_id = cm_id->remote_id;
2950         work->mad_recv_wc = NULL;
2951         work->cm_event.event = IB_CM_USER_ESTABLISHED;
2952         queue_work(cm.wq, &work->work);
2953 out:
2954         return ret;
2955 }
2956 EXPORT_SYMBOL(ib_cm_establish);
2957
2958 static void cm_recv_handler(struct ib_mad_agent *mad_agent,
2959                             struct ib_mad_recv_wc *mad_recv_wc)
2960 {
2961         struct cm_work *work;
2962         enum ib_cm_event_type event;
2963         int paths = 0;
2964
2965         switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
2966         case CM_REQ_ATTR_ID:
2967                 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)->
2968                                                     alt_local_lid != 0);
2969                 event = IB_CM_REQ_RECEIVED;
2970                 break;
2971         case CM_MRA_ATTR_ID:
2972                 event = IB_CM_MRA_RECEIVED;
2973                 break;
2974         case CM_REJ_ATTR_ID:
2975                 event = IB_CM_REJ_RECEIVED;
2976                 break;
2977         case CM_REP_ATTR_ID:
2978                 event = IB_CM_REP_RECEIVED;
2979                 break;
2980         case CM_RTU_ATTR_ID:
2981                 event = IB_CM_RTU_RECEIVED;
2982                 break;
2983         case CM_DREQ_ATTR_ID:
2984                 event = IB_CM_DREQ_RECEIVED;
2985                 break;
2986         case CM_DREP_ATTR_ID:
2987                 event = IB_CM_DREP_RECEIVED;
2988                 break;
2989         case CM_SIDR_REQ_ATTR_ID:
2990                 event = IB_CM_SIDR_REQ_RECEIVED;
2991                 break;
2992         case CM_SIDR_REP_ATTR_ID:
2993                 event = IB_CM_SIDR_REP_RECEIVED;
2994                 break;
2995         case CM_LAP_ATTR_ID:
2996                 paths = 1;
2997                 event = IB_CM_LAP_RECEIVED;
2998                 break;
2999         case CM_APR_ATTR_ID:
3000                 event = IB_CM_APR_RECEIVED;
3001                 break;
3002         default:
3003                 ib_free_recv_mad(mad_recv_wc);
3004                 return;
3005         }
3006
3007         work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths,
3008                        GFP_KERNEL);
3009         if (!work) {
3010                 ib_free_recv_mad(mad_recv_wc);
3011                 return;
3012         }
3013
3014         INIT_WORK(&work->work, cm_work_handler, work);
3015         work->cm_event.event = event;
3016         work->mad_recv_wc = mad_recv_wc;
3017         work->port = (struct cm_port *)mad_agent->context;
3018         queue_work(cm.wq, &work->work);
3019 }
3020
3021 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
3022                                 struct ib_qp_attr *qp_attr,
3023                                 int *qp_attr_mask)
3024 {
3025         unsigned long flags;
3026         int ret;
3027
3028         spin_lock_irqsave(&cm_id_priv->lock, flags);
3029         switch (cm_id_priv->id.state) {
3030         case IB_CM_REQ_SENT:
3031         case IB_CM_MRA_REQ_RCVD:
3032         case IB_CM_REQ_RCVD:
3033         case IB_CM_MRA_REQ_SENT:
3034         case IB_CM_REP_RCVD:
3035         case IB_CM_MRA_REP_SENT:
3036         case IB_CM_REP_SENT:
3037         case IB_CM_MRA_REP_RCVD:
3038         case IB_CM_ESTABLISHED:
3039                 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
3040                                 IB_QP_PKEY_INDEX | IB_QP_PORT;
3041                 qp_attr->qp_access_flags = IB_ACCESS_LOCAL_WRITE |
3042                                            IB_ACCESS_REMOTE_WRITE;
3043                 if (cm_id_priv->responder_resources)
3044                         qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ;
3045                 qp_attr->pkey_index = cm_id_priv->av.pkey_index;
3046                 qp_attr->port_num = cm_id_priv->av.port->port_num;
3047                 ret = 0;
3048                 break;
3049         default:
3050                 ret = -EINVAL;
3051                 break;
3052         }
3053         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3054         return ret;
3055 }
3056
3057 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
3058                                struct ib_qp_attr *qp_attr,
3059                                int *qp_attr_mask)
3060 {
3061         unsigned long flags;
3062         int ret;
3063
3064         spin_lock_irqsave(&cm_id_priv->lock, flags);
3065         switch (cm_id_priv->id.state) {
3066         case IB_CM_REQ_RCVD:
3067         case IB_CM_MRA_REQ_SENT:
3068         case IB_CM_REP_RCVD:
3069         case IB_CM_MRA_REP_SENT:
3070         case IB_CM_REP_SENT:
3071         case IB_CM_MRA_REP_RCVD:
3072         case IB_CM_ESTABLISHED:
3073                 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
3074                                 IB_QP_DEST_QPN | IB_QP_RQ_PSN;
3075                 qp_attr->ah_attr = cm_id_priv->av.ah_attr;
3076                 qp_attr->path_mtu = cm_id_priv->path_mtu;
3077                 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
3078                 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
3079                 if (cm_id_priv->qp_type == IB_QPT_RC) {
3080                         *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC |
3081                                          IB_QP_MIN_RNR_TIMER;
3082                         qp_attr->max_dest_rd_atomic =
3083                                         cm_id_priv->responder_resources;
3084                         qp_attr->min_rnr_timer = 0;
3085                 }
3086                 if (cm_id_priv->alt_av.ah_attr.dlid) {
3087                         *qp_attr_mask |= IB_QP_ALT_PATH;
3088                         qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3089                 }
3090                 ret = 0;
3091                 break;
3092         default:
3093                 ret = -EINVAL;
3094                 break;
3095         }
3096         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3097         return ret;
3098 }
3099
3100 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv,
3101                                struct ib_qp_attr *qp_attr,
3102                                int *qp_attr_mask)
3103 {
3104         unsigned long flags;
3105         int ret;
3106
3107         spin_lock_irqsave(&cm_id_priv->lock, flags);
3108         switch (cm_id_priv->id.state) {
3109         case IB_CM_REP_RCVD:
3110         case IB_CM_MRA_REP_SENT:
3111         case IB_CM_REP_SENT:
3112         case IB_CM_MRA_REP_RCVD:
3113         case IB_CM_ESTABLISHED:
3114                 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN;
3115                 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn);
3116                 if (cm_id_priv->qp_type == IB_QPT_RC) {
3117                         *qp_attr_mask |= IB_QP_TIMEOUT | IB_QP_RETRY_CNT |
3118                                          IB_QP_RNR_RETRY |
3119                                          IB_QP_MAX_QP_RD_ATOMIC;
3120                         qp_attr->timeout = cm_id_priv->local_ack_timeout;
3121                         qp_attr->retry_cnt = cm_id_priv->retry_count;
3122                         qp_attr->rnr_retry = cm_id_priv->rnr_retry_count;
3123                         qp_attr->max_rd_atomic = cm_id_priv->initiator_depth;
3124                 }
3125                 if (cm_id_priv->alt_av.ah_attr.dlid) {
3126                         *qp_attr_mask |= IB_QP_PATH_MIG_STATE;
3127                         qp_attr->path_mig_state = IB_MIG_REARM;
3128                 }
3129                 ret = 0;
3130                 break;
3131         default:
3132                 ret = -EINVAL;
3133                 break;
3134         }
3135         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3136         return ret;
3137 }
3138
3139 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
3140                        struct ib_qp_attr *qp_attr,
3141                        int *qp_attr_mask)
3142 {
3143         struct cm_id_private *cm_id_priv;
3144         int ret;
3145
3146         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3147         switch (qp_attr->qp_state) {
3148         case IB_QPS_INIT:
3149                 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask);
3150                 break;
3151         case IB_QPS_RTR:
3152                 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask);
3153                 break;
3154         case IB_QPS_RTS:
3155                 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask);
3156                 break;
3157         default:
3158                 ret = -EINVAL;
3159                 break;
3160         }
3161         return ret;
3162 }
3163 EXPORT_SYMBOL(ib_cm_init_qp_attr);
3164
3165 static __be64 cm_get_ca_guid(struct ib_device *device)
3166 {
3167         struct ib_device_attr *device_attr;
3168         __be64 guid;
3169         int ret;
3170
3171         device_attr = kmalloc(sizeof *device_attr, GFP_KERNEL);
3172         if (!device_attr)
3173                 return 0;
3174
3175         ret = ib_query_device(device, device_attr);
3176         guid = ret ? 0 : device_attr->node_guid;
3177         kfree(device_attr);
3178         return guid;
3179 }
3180
3181 static void cm_add_one(struct ib_device *device)
3182 {
3183         struct cm_device *cm_dev;
3184         struct cm_port *port;
3185         struct ib_mad_reg_req reg_req = {
3186                 .mgmt_class = IB_MGMT_CLASS_CM,
3187                 .mgmt_class_version = IB_CM_CLASS_VERSION
3188         };
3189         struct ib_port_modify port_modify = {
3190                 .set_port_cap_mask = IB_PORT_CM_SUP
3191         };
3192         unsigned long flags;
3193         int ret;
3194         u8 i;
3195
3196         cm_dev = kmalloc(sizeof(*cm_dev) + sizeof(*port) *
3197                          device->phys_port_cnt, GFP_KERNEL);
3198         if (!cm_dev)
3199                 return;
3200
3201         cm_dev->device = device;
3202         cm_dev->ca_guid = cm_get_ca_guid(device);
3203         if (!cm_dev->ca_guid)
3204                 goto error1;
3205
3206         set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
3207         for (i = 1; i <= device->phys_port_cnt; i++) {
3208                 port = &cm_dev->port[i-1];
3209                 port->cm_dev = cm_dev;
3210                 port->port_num = i;
3211                 port->mad_agent = ib_register_mad_agent(device, i,
3212                                                         IB_QPT_GSI,
3213                                                         &reg_req,
3214                                                         0,
3215                                                         cm_send_handler,
3216                                                         cm_recv_handler,
3217                                                         port);
3218                 if (IS_ERR(port->mad_agent))
3219                         goto error2;
3220
3221                 ret = ib_modify_port(device, i, 0, &port_modify);
3222                 if (ret)
3223                         goto error3;
3224         }
3225         ib_set_client_data(device, &cm_client, cm_dev);
3226
3227         write_lock_irqsave(&cm.device_lock, flags);
3228         list_add_tail(&cm_dev->list, &cm.device_list);
3229         write_unlock_irqrestore(&cm.device_lock, flags);
3230         return;
3231
3232 error3:
3233         ib_unregister_mad_agent(port->mad_agent);
3234 error2:
3235         port_modify.set_port_cap_mask = 0;
3236         port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
3237         while (--i) {
3238                 port = &cm_dev->port[i-1];
3239                 ib_modify_port(device, port->port_num, 0, &port_modify);
3240                 ib_unregister_mad_agent(port->mad_agent);
3241         }
3242 error1:
3243         kfree(cm_dev);
3244 }
3245
3246 static void cm_remove_one(struct ib_device *device)
3247 {
3248         struct cm_device *cm_dev;
3249         struct cm_port *port;
3250         struct ib_port_modify port_modify = {
3251                 .clr_port_cap_mask = IB_PORT_CM_SUP
3252         };
3253         unsigned long flags;
3254         int i;
3255
3256         cm_dev = ib_get_client_data(device, &cm_client);
3257         if (!cm_dev)
3258                 return;
3259
3260         write_lock_irqsave(&cm.device_lock, flags);
3261         list_del(&cm_dev->list);
3262         write_unlock_irqrestore(&cm.device_lock, flags);
3263
3264         for (i = 1; i <= device->phys_port_cnt; i++) {
3265                 port = &cm_dev->port[i-1];
3266                 ib_modify_port(device, port->port_num, 0, &port_modify);
3267                 ib_unregister_mad_agent(port->mad_agent);
3268         }
3269         kfree(cm_dev);
3270 }
3271
3272 static int __init ib_cm_init(void)
3273 {
3274         int ret;
3275
3276         memset(&cm, 0, sizeof cm);
3277         INIT_LIST_HEAD(&cm.device_list);
3278         rwlock_init(&cm.device_lock);
3279         spin_lock_init(&cm.lock);
3280         cm.listen_service_table = RB_ROOT;
3281         cm.listen_service_id = __constant_be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID);
3282         cm.remote_id_table = RB_ROOT;
3283         cm.remote_qp_table = RB_ROOT;
3284         cm.remote_sidr_table = RB_ROOT;
3285         idr_init(&cm.local_id_table);
3286         idr_pre_get(&cm.local_id_table, GFP_KERNEL);
3287
3288         cm.wq = create_workqueue("ib_cm");
3289         if (!cm.wq)
3290                 return -ENOMEM;
3291
3292         ret = ib_register_client(&cm_client);
3293         if (ret)
3294                 goto error;
3295
3296         return 0;
3297 error:
3298         destroy_workqueue(cm.wq);
3299         return ret;
3300 }
3301
3302 static void __exit ib_cm_cleanup(void)
3303 {
3304         flush_workqueue(cm.wq);
3305         destroy_workqueue(cm.wq);
3306         ib_unregister_client(&cm_client);
3307         idr_destroy(&cm.local_id_table);
3308 }
3309
3310 module_init(ib_cm_init);
3311 module_exit(ib_cm_cleanup);
3312