drivers/infiniband/core/cm.c

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