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

   1 /*
   2  * Copyright (c) 2004-2006 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 4311 2005-12-05 18:42:01Z sean.hefty $
  36  */
  37
  38 #include <linux/completion.h>
  39 #include <linux/dma-mapping.h>
  40 #include <linux/err.h>
  41 #include <linux/idr.h>
  42 #include <linux/interrupt.h>
  43 #include <linux/random.h>
  44 #include <linux/rbtree.h>
  45 #include <linux/spinlock.h>
  46 #include <linux/workqueue.h>
  47
  48 #include <rdma/ib_cache.h>
  49 #include <rdma/ib_cm.h>
  50 #include "cm_msgs.h"
  51
  52 MODULE_AUTHOR("Sean Hefty");
  53 MODULE_DESCRIPTION("InfiniBand CM");
  54 MODULE_LICENSE("Dual BSD/GPL");
  55
  56 static void cm_add_one(struct ib_device *device);
  57 static void cm_remove_one(struct ib_device *device);
  58
  59 static struct ib_client cm_client = {
  60         .name   = "cm",
  61         .add    = cm_add_one,
  62         .remove = cm_remove_one
  63 };
  64
  65 static struct ib_cm {
  66         spinlock_t lock;
  67         struct list_head device_list;
  68         rwlock_t device_lock;
  69         struct rb_root listen_service_table;
  70         u64 listen_service_id;
  71         /* struct rb_root peer_service_table; todo: fix peer to peer */
  72         struct rb_root remote_qp_table;
  73         struct rb_root remote_id_table;
  74         struct rb_root remote_sidr_table;
  75         struct idr local_id_table;
  76         __be32 random_id_operand;
  77         struct list_head timewait_list;
  78         struct workqueue_struct *wq;
  79 } cm;
  80
  81 struct cm_port {
  82         struct cm_device *cm_dev;
  83         struct ib_mad_agent *mad_agent;
  84         u8 port_num;
  85 };
  86
  87 struct cm_device {
  88         struct list_head list;
  89         struct ib_device *device;
  90         struct cm_port port[0];
  91 };
  92
  93 struct cm_av {
  94         struct cm_port *port;
  95         union ib_gid dgid;
  96         struct ib_ah_attr ah_attr;
  97         u16 pkey_index;
  98         u8 packet_life_time;
  99 };
 100
 101 struct cm_work {
 102         struct delayed_work work;
 103         struct list_head list;
 104         struct cm_port *port;
 105         struct ib_mad_recv_wc *mad_recv_wc;     /* Received MADs */
 106         __be32 local_id;                        /* Established / timewait */
 107         __be32 remote_id;
 108         struct ib_cm_event cm_event;
 109         struct ib_sa_path_rec path[0];
 110 };
 111
 112 struct cm_timewait_info {
 113         struct cm_work work;                    /* Must be first. */
 114         struct list_head list;
 115         struct rb_node remote_qp_node;
 116         struct rb_node remote_id_node;
 117         __be64 remote_ca_guid;
 118         __be32 remote_qpn;
 119         u8 inserted_remote_qp;
 120         u8 inserted_remote_id;
 121 };
 122
 123 struct cm_id_private {
 124         struct ib_cm_id id;
 125
 126         struct rb_node service_node;
 127         struct rb_node sidr_id_node;
 128         spinlock_t lock;        /* Do not acquire inside cm.lock */
 129         struct completion comp;
 130         atomic_t refcount;
 131
 132         struct ib_mad_send_buf *msg;
 133         struct cm_timewait_info *timewait_info;
 134         /* todo: use alternate port on send failure */
 135         struct cm_av av;
 136         struct cm_av alt_av;
 137         struct ib_cm_compare_data *compare_data;
 138
 139         void *private_data;
 140         __be64 tid;
 141         __be32 local_qpn;
 142         __be32 remote_qpn;
 143         enum ib_qp_type qp_type;
 144         __be32 sq_psn;
 145         __be32 rq_psn;
 146         int timeout_ms;
 147         enum ib_mtu path_mtu;
 148         __be16 pkey;
 149         u8 private_data_len;
 150         u8 max_cm_retries;
 151         u8 peer_to_peer;
 152         u8 responder_resources;
 153         u8 initiator_depth;
 154         u8 retry_count;
 155         u8 rnr_retry_count;
 156         u8 service_timeout;
 157
 158         struct list_head work_list;
 159         atomic_t work_count;
 160 };
 161
 162 static void cm_work_handler(struct work_struct *work);
 163
 164 static inline void cm_deref_id(struct cm_id_private *cm_id_priv)
 165 {
 166         if (atomic_dec_and_test(&cm_id_priv->refcount))
 167                 complete(&cm_id_priv->comp);
 168 }
 169
 170 static int cm_alloc_msg(struct cm_id_private *cm_id_priv,
 171                         struct ib_mad_send_buf **msg)
 172 {
 173         struct ib_mad_agent *mad_agent;
 174         struct ib_mad_send_buf *m;
 175         struct ib_ah *ah;
 176
 177         mad_agent = cm_id_priv->av.port->mad_agent;
 178         ah = ib_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr);
 179         if (IS_ERR(ah))
 180                 return PTR_ERR(ah);
 181
 182         m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn,
 183                                cm_id_priv->av.pkey_index,
 184                                0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
 185                                GFP_ATOMIC);
 186         if (IS_ERR(m)) {
 187                 ib_destroy_ah(ah);
 188                 return PTR_ERR(m);
 189         }
 190
 191         /* Timeout set by caller if response is expected. */
 192         m->ah = ah;
 193         m->retries = cm_id_priv->max_cm_retries;
 194
 195         atomic_inc(&cm_id_priv->refcount);
 196         m->context[0] = cm_id_priv;
 197         *msg = m;
 198         return 0;
 199 }
 200
 201 static int cm_alloc_response_msg(struct cm_port *port,
 202                                  struct ib_mad_recv_wc *mad_recv_wc,
 203                                  struct ib_mad_send_buf **msg)
 204 {
 205         struct ib_mad_send_buf *m;
 206         struct ib_ah *ah;
 207
 208         ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc,
 209                                   mad_recv_wc->recv_buf.grh, port->port_num);
 210         if (IS_ERR(ah))
 211                 return PTR_ERR(ah);
 212
 213         m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index,
 214                                0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
 215                                GFP_ATOMIC);
 216         if (IS_ERR(m)) {
 217                 ib_destroy_ah(ah);
 218                 return PTR_ERR(m);
 219         }
 220         m->ah = ah;
 221         *msg = m;
 222         return 0;
 223 }
 224
 225 static void cm_free_msg(struct ib_mad_send_buf *msg)
 226 {
 227         ib_destroy_ah(msg->ah);
 228         if (msg->context[0])
 229                 cm_deref_id(msg->context[0]);
 230         ib_free_send_mad(msg);
 231 }
 232
 233 static void * cm_copy_private_data(const void *private_data,
 234                                    u8 private_data_len)
 235 {
 236         void *data;
 237
 238         if (!private_data || !private_data_len)
 239                 return NULL;
 240
 241         data = kmemdup(private_data, private_data_len, GFP_KERNEL);
 242         if (!data)
 243                 return ERR_PTR(-ENOMEM);
 244
 245         return data;
 246 }
 247
 248 static void cm_set_private_data(struct cm_id_private *cm_id_priv,
 249                                  void *private_data, u8 private_data_len)
 250 {
 251         if (cm_id_priv->private_data && cm_id_priv->private_data_len)
 252                 kfree(cm_id_priv->private_data);
 253
 254         cm_id_priv->private_data = private_data;
 255         cm_id_priv->private_data_len = private_data_len;
 256 }
 257
 258 static void cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc,
 259                                     struct ib_grh *grh, struct cm_av *av)
 260 {
 261         av->port = port;
 262         av->pkey_index = wc->pkey_index;
 263         ib_init_ah_from_wc(port->cm_dev->device, port->port_num, wc,
 264                            grh, &av->ah_attr);
 265 }
 266
 267 static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av)
 268 {
 269         struct cm_device *cm_dev;
 270         struct cm_port *port = NULL;
 271         unsigned long flags;
 272         int ret;
 273         u8 p;
 274
 275         read_lock_irqsave(&cm.device_lock, flags);
 276         list_for_each_entry(cm_dev, &cm.device_list, list) {
 277                 if (!ib_find_cached_gid(cm_dev->device, &path->sgid,
 278                                         &p, NULL)) {
 279                         port = &cm_dev->port[p-1];
 280                         break;
 281                 }
 282         }
 283         read_unlock_irqrestore(&cm.device_lock, flags);
 284
 285         if (!port)
 286                 return -EINVAL;
 287
 288         ret = ib_find_cached_pkey(cm_dev->device, port->port_num,
 289                                   be16_to_cpu(path->pkey), &av->pkey_index);
 290         if (ret)
 291                 return ret;
 292
 293         av->port = port;
 294         ib_init_ah_from_path(cm_dev->device, port->port_num, path,
 295                              &av->ah_attr);
 296         av->packet_life_time = path->packet_life_time;
 297         return 0;
 298 }
 299
 300 static int cm_alloc_id(struct cm_id_private *cm_id_priv)
 301 {
 302         unsigned long flags;
 303         int ret, id;
 304         static int next_id;
 305
 306         do {
 307                 spin_lock_irqsave(&cm.lock, flags);
 308                 ret = idr_get_new_above(&cm.local_id_table, cm_id_priv,
 309                                         next_id++, &id);
 310                 spin_unlock_irqrestore(&cm.lock, flags);
 311         } while( (ret == -EAGAIN) && idr_pre_get(&cm.local_id_table, GFP_KERNEL) );
 312
 313         cm_id_priv->id.local_id = (__force __be32) (id ^ cm.random_id_operand);
 314         return ret;
 315 }
 316
 317 static void cm_free_id(__be32 local_id)
 318 {
 319         unsigned long flags;
 320
 321         spin_lock_irqsave(&cm.lock, flags);
 322         idr_remove(&cm.local_id_table,
 323                    (__force int) (local_id ^ cm.random_id_operand));
 324         spin_unlock_irqrestore(&cm.lock, flags);
 325 }
 326
 327 static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id)
 328 {
 329         struct cm_id_private *cm_id_priv;
 330
 331         cm_id_priv = idr_find(&cm.local_id_table,
 332                               (__force int) (local_id ^ cm.random_id_operand));
 333         if (cm_id_priv) {
 334                 if (cm_id_priv->id.remote_id == remote_id)
 335                         atomic_inc(&cm_id_priv->refcount);
 336                 else
 337                         cm_id_priv = NULL;
 338         }
 339
 340         return cm_id_priv;
 341 }
 342
 343 static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id)
 344 {
 345         struct cm_id_private *cm_id_priv;
 346         unsigned long flags;
 347
 348         spin_lock_irqsave(&cm.lock, flags);
 349         cm_id_priv = cm_get_id(local_id, remote_id);
 350         spin_unlock_irqrestore(&cm.lock, flags);
 351
 352         return cm_id_priv;
 353 }
 354
 355 static void cm_mask_copy(u8 *dst, u8 *src, u8 *mask)
 356 {
 357         int i;
 358
 359         for (i = 0; i < IB_CM_COMPARE_SIZE / sizeof(unsigned long); i++)
 360                 ((unsigned long *) dst)[i] = ((unsigned long *) src)[i] &
 361                                              ((unsigned long *) mask)[i];
 362 }
 363
 364 static int cm_compare_data(struct ib_cm_compare_data *src_data,
 365                            struct ib_cm_compare_data *dst_data)
 366 {
 367         u8 src[IB_CM_COMPARE_SIZE];
 368         u8 dst[IB_CM_COMPARE_SIZE];
 369
 370         if (!src_data || !dst_data)
 371                 return 0;
 372
 373         cm_mask_copy(src, src_data->data, dst_data->mask);
 374         cm_mask_copy(dst, dst_data->data, src_data->mask);
 375         return memcmp(src, dst, IB_CM_COMPARE_SIZE);
 376 }
 377
 378 static int cm_compare_private_data(u8 *private_data,
 379                                    struct ib_cm_compare_data *dst_data)
 380 {
 381         u8 src[IB_CM_COMPARE_SIZE];
 382
 383         if (!dst_data)
 384                 return 0;
 385
 386         cm_mask_copy(src, private_data, dst_data->mask);
 387         return memcmp(src, dst_data->data, IB_CM_COMPARE_SIZE);
 388 }
 389
 390 static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv)
 391 {
 392         struct rb_node **link = &cm.listen_service_table.rb_node;
 393         struct rb_node *parent = NULL;
 394         struct cm_id_private *cur_cm_id_priv;
 395         __be64 service_id = cm_id_priv->id.service_id;
 396         __be64 service_mask = cm_id_priv->id.service_mask;
 397         int data_cmp;
 398
 399         while (*link) {
 400                 parent = *link;
 401                 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
 402                                           service_node);
 403                 data_cmp = cm_compare_data(cm_id_priv->compare_data,
 404                                            cur_cm_id_priv->compare_data);
 405                 if ((cur_cm_id_priv->id.service_mask & service_id) ==
 406                     (service_mask & cur_cm_id_priv->id.service_id) &&
 407                     (cm_id_priv->id.device == cur_cm_id_priv->id.device) &&
 408                     !data_cmp)
 409                         return cur_cm_id_priv;
 410
 411                 if (cm_id_priv->id.device < cur_cm_id_priv->id.device)
 412                         link = &(*link)->rb_left;
 413                 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device)
 414                         link = &(*link)->rb_right;
 415                 else if (service_id < cur_cm_id_priv->id.service_id)
 416                         link = &(*link)->rb_left;
 417                 else if (service_id > cur_cm_id_priv->id.service_id)
 418                         link = &(*link)->rb_right;
 419                 else if (data_cmp < 0)
 420                         link = &(*link)->rb_left;
 421                 else
 422                         link = &(*link)->rb_right;
 423         }
 424         rb_link_node(&cm_id_priv->service_node, parent, link);
 425         rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table);
 426         return NULL;
 427 }
 428
 429 static struct cm_id_private * cm_find_listen(struct ib_device *device,
 430                                              __be64 service_id,
 431                                              u8 *private_data)
 432 {
 433         struct rb_node *node = cm.listen_service_table.rb_node;
 434         struct cm_id_private *cm_id_priv;
 435         int data_cmp;
 436
 437         while (node) {
 438                 cm_id_priv = rb_entry(node, struct cm_id_private, service_node);
 439                 data_cmp = cm_compare_private_data(private_data,
 440                                                    cm_id_priv->compare_data);
 441                 if ((cm_id_priv->id.service_mask & service_id) ==
 442                      cm_id_priv->id.service_id &&
 443                     (cm_id_priv->id.device == device) && !data_cmp)
 444                         return cm_id_priv;
 445
 446                 if (device < cm_id_priv->id.device)
 447                         node = node->rb_left;
 448                 else if (device > cm_id_priv->id.device)
 449                         node = node->rb_right;
 450                 else if (service_id < cm_id_priv->id.service_id)
 451                         node = node->rb_left;
 452                 else if (service_id > cm_id_priv->id.service_id)
 453                         node = node->rb_right;
 454                 else if (data_cmp < 0)
 455                         node = node->rb_left;
 456                 else
 457                         node = node->rb_right;
 458         }
 459         return NULL;
 460 }
 461
 462 static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info
 463                                                      *timewait_info)
 464 {
 465         struct rb_node **link = &cm.remote_id_table.rb_node;
 466         struct rb_node *parent = NULL;
 467         struct cm_timewait_info *cur_timewait_info;
 468         __be64 remote_ca_guid = timewait_info->remote_ca_guid;
 469         __be32 remote_id = timewait_info->work.remote_id;
 470
 471         while (*link) {
 472                 parent = *link;
 473                 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
 474                                              remote_id_node);
 475                 if (remote_id < cur_timewait_info->work.remote_id)
 476                         link = &(*link)->rb_left;
 477                 else if (remote_id > cur_timewait_info->work.remote_id)
 478                         link = &(*link)->rb_right;
 479                 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid)
 480                         link = &(*link)->rb_left;
 481                 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid)
 482                         link = &(*link)->rb_right;
 483                 else
 484                         return cur_timewait_info;
 485         }
 486         timewait_info->inserted_remote_id = 1;
 487         rb_link_node(&timewait_info->remote_id_node, parent, link);
 488         rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table);
 489         return NULL;
 490 }
 491
 492 static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid,
 493                                                    __be32 remote_id)
 494 {
 495         struct rb_node *node = cm.remote_id_table.rb_node;
 496         struct cm_timewait_info *timewait_info;
 497
 498         while (node) {
 499                 timewait_info = rb_entry(node, struct cm_timewait_info,
 500                                          remote_id_node);
 501                 if (remote_id < timewait_info->work.remote_id)
 502                         node = node->rb_left;
 503                 else if (remote_id > timewait_info->work.remote_id)
 504                         node = node->rb_right;
 505                 else if (remote_ca_guid < timewait_info->remote_ca_guid)
 506                         node = node->rb_left;
 507                 else if (remote_ca_guid > timewait_info->remote_ca_guid)
 508                         node = node->rb_right;
 509                 else
 510                         return timewait_info;
 511         }
 512         return NULL;
 513 }
 514
 515 static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info
 516                                                       *timewait_info)
 517 {
 518         struct rb_node **link = &cm.remote_qp_table.rb_node;
 519         struct rb_node *parent = NULL;
 520         struct cm_timewait_info *cur_timewait_info;
 521         __be64 remote_ca_guid = timewait_info->remote_ca_guid;
 522         __be32 remote_qpn = timewait_info->remote_qpn;
 523
 524         while (*link) {
 525                 parent = *link;
 526                 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
 527                                              remote_qp_node);
 528                 if (remote_qpn < cur_timewait_info->remote_qpn)
 529                         link = &(*link)->rb_left;
 530                 else if (remote_qpn > cur_timewait_info->remote_qpn)
 531                         link = &(*link)->rb_right;
 532                 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid)
 533                         link = &(*link)->rb_left;
 534                 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid)
 535                         link = &(*link)->rb_right;
 536                 else
 537                         return cur_timewait_info;
 538         }
 539         timewait_info->inserted_remote_qp = 1;
 540         rb_link_node(&timewait_info->remote_qp_node, parent, link);
 541         rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table);
 542         return NULL;
 543 }
 544
 545 static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private
 546                                                     *cm_id_priv)
 547 {
 548         struct rb_node **link = &cm.remote_sidr_table.rb_node;
 549         struct rb_node *parent = NULL;
 550         struct cm_id_private *cur_cm_id_priv;
 551         union ib_gid *port_gid = &cm_id_priv->av.dgid;
 552         __be32 remote_id = cm_id_priv->id.remote_id;
 553
 554         while (*link) {
 555                 parent = *link;
 556                 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
 557                                           sidr_id_node);
 558                 if (remote_id < cur_cm_id_priv->id.remote_id)
 559                         link = &(*link)->rb_left;
 560                 else if (remote_id > cur_cm_id_priv->id.remote_id)
 561                         link = &(*link)->rb_right;
 562                 else {
 563                         int cmp;
 564                         cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid,
 565                                      sizeof *port_gid);
 566                         if (cmp < 0)
 567                                 link = &(*link)->rb_left;
 568                         else if (cmp > 0)
 569                                 link = &(*link)->rb_right;
 570                         else
 571                                 return cur_cm_id_priv;
 572                 }
 573         }
 574         rb_link_node(&cm_id_priv->sidr_id_node, parent, link);
 575         rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
 576         return NULL;
 577 }
 578
 579 static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv,
 580                                enum ib_cm_sidr_status status)
 581 {
 582         struct ib_cm_sidr_rep_param param;
 583
 584         memset(&param, 0, sizeof param);
 585         param.status = status;
 586         ib_send_cm_sidr_rep(&cm_id_priv->id, &param);
 587 }
 588
 589 struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
 590                                  ib_cm_handler cm_handler,
 591                                  void *context)
 592 {
 593         struct cm_id_private *cm_id_priv;
 594         int ret;
 595
 596         cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL);
 597         if (!cm_id_priv)
 598                 return ERR_PTR(-ENOMEM);
 599
 600         cm_id_priv->id.state = IB_CM_IDLE;
 601         cm_id_priv->id.device = device;
 602         cm_id_priv->id.cm_handler = cm_handler;
 603         cm_id_priv->id.context = context;
 604         cm_id_priv->id.remote_cm_qpn = 1;
 605         ret = cm_alloc_id(cm_id_priv);
 606         if (ret)
 607                 goto error;
 608
 609         spin_lock_init(&cm_id_priv->lock);
 610         init_completion(&cm_id_priv->comp);
 611         INIT_LIST_HEAD(&cm_id_priv->work_list);
 612         atomic_set(&cm_id_priv->work_count, -1);
 613         atomic_set(&cm_id_priv->refcount, 1);
 614         return &cm_id_priv->id;
 615
 616 error:
 617         kfree(cm_id_priv);
 618         return ERR_PTR(-ENOMEM);
 619 }
 620 EXPORT_SYMBOL(ib_create_cm_id);
 621
 622 static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv)
 623 {
 624         struct cm_work *work;
 625
 626         if (list_empty(&cm_id_priv->work_list))
 627                 return NULL;
 628
 629         work = list_entry(cm_id_priv->work_list.next, struct cm_work, list);
 630         list_del(&work->list);
 631         return work;
 632 }
 633
 634 static void cm_free_work(struct cm_work *work)
 635 {
 636         if (work->mad_recv_wc)
 637                 ib_free_recv_mad(work->mad_recv_wc);
 638         kfree(work);
 639 }
 640
 641 static inline int cm_convert_to_ms(int iba_time)
 642 {
 643         /* approximate conversion to ms from 4.096us x 2^iba_time */
 644         return 1 << max(iba_time - 8, 0);
 645 }
 646
 647 static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info)
 648 {
 649         if (timewait_info->inserted_remote_id) {
 650                 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table);
 651                 timewait_info->inserted_remote_id = 0;
 652         }
 653
 654         if (timewait_info->inserted_remote_qp) {
 655                 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table);
 656                 timewait_info->inserted_remote_qp = 0;
 657         }
 658 }
 659
 660 static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id)
 661 {
 662         struct cm_timewait_info *timewait_info;
 663
 664         timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL);
 665         if (!timewait_info)
 666                 return ERR_PTR(-ENOMEM);
 667
 668         timewait_info->work.local_id = local_id;
 669         INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler);
 670         timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT;
 671         return timewait_info;
 672 }
 673
 674 static void cm_enter_timewait(struct cm_id_private *cm_id_priv)
 675 {
 676         int wait_time;
 677         unsigned long flags;
 678
 679         spin_lock_irqsave(&cm.lock, flags);
 680         cm_cleanup_timewait(cm_id_priv->timewait_info);
 681         list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list);
 682         spin_unlock_irqrestore(&cm.lock, flags);
 683
 684         /*
 685          * The cm_id could be destroyed by the user before we exit timewait.
 686          * To protect against this, we search for the cm_id after exiting
 687          * timewait before notifying the user that we've exited timewait.
 688          */
 689         cm_id_priv->id.state = IB_CM_TIMEWAIT;
 690         wait_time = cm_convert_to_ms(cm_id_priv->av.packet_life_time + 1);
 691         queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work,
 692                            msecs_to_jiffies(wait_time));
 693         cm_id_priv->timewait_info = NULL;
 694 }
 695
 696 static void cm_reset_to_idle(struct cm_id_private *cm_id_priv)
 697 {
 698         unsigned long flags;
 699
 700         cm_id_priv->id.state = IB_CM_IDLE;
 701         if (cm_id_priv->timewait_info) {
 702                 spin_lock_irqsave(&cm.lock, flags);
 703                 cm_cleanup_timewait(cm_id_priv->timewait_info);
 704                 spin_unlock_irqrestore(&cm.lock, flags);
 705                 kfree(cm_id_priv->timewait_info);
 706                 cm_id_priv->timewait_info = NULL;
 707         }
 708 }
 709
 710 static void cm_destroy_id(struct ib_cm_id *cm_id, int err)
 711 {
 712         struct cm_id_private *cm_id_priv;
 713         struct cm_work *work;
 714         unsigned long flags;
 715
 716         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
 717 retest:
 718         spin_lock_irqsave(&cm_id_priv->lock, flags);
 719         switch (cm_id->state) {
 720         case IB_CM_LISTEN:
 721                 cm_id->state = IB_CM_IDLE;
 722                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 723                 spin_lock_irqsave(&cm.lock, flags);
 724                 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table);
 725                 spin_unlock_irqrestore(&cm.lock, flags);
 726                 break;
 727         case IB_CM_SIDR_REQ_SENT:
 728                 cm_id->state = IB_CM_IDLE;
 729                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
 730                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 731                 break;
 732         case IB_CM_SIDR_REQ_RCVD:
 733                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 734                 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT);
 735                 break;
 736         case IB_CM_REQ_SENT:
 737                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
 738                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 739                 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT,
 740                                &cm_id_priv->id.device->node_guid,
 741                                sizeof cm_id_priv->id.device->node_guid,
 742                                NULL, 0);
 743                 break;
 744         case IB_CM_REQ_RCVD:
 745                 if (err == -ENOMEM) {
 746                         /* Do not reject to allow future retries. */
 747                         cm_reset_to_idle(cm_id_priv);
 748                         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 749                 } else {
 750                         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 751                         ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
 752                                        NULL, 0, NULL, 0);
 753                 }
 754                 break;
 755         case IB_CM_MRA_REQ_RCVD:
 756         case IB_CM_REP_SENT:
 757         case IB_CM_MRA_REP_RCVD:
 758                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
 759                 /* Fall through */
 760         case IB_CM_MRA_REQ_SENT:
 761         case IB_CM_REP_RCVD:
 762         case IB_CM_MRA_REP_SENT:
 763                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 764                 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
 765                                NULL, 0, NULL, 0);
 766                 break;
 767         case IB_CM_ESTABLISHED:
 768                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 769                 ib_send_cm_dreq(cm_id, NULL, 0);
 770                 goto retest;
 771         case IB_CM_DREQ_SENT:
 772                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
 773                 cm_enter_timewait(cm_id_priv);
 774                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 775                 break;
 776         case IB_CM_DREQ_RCVD:
 777                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 778                 ib_send_cm_drep(cm_id, NULL, 0);
 779                 break;
 780         default:
 781                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 782                 break;
 783         }
 784
 785         cm_free_id(cm_id->local_id);
 786         cm_deref_id(cm_id_priv);
 787         wait_for_completion(&cm_id_priv->comp);
 788         while ((work = cm_dequeue_work(cm_id_priv)) != NULL)
 789                 cm_free_work(work);
 790         kfree(cm_id_priv->compare_data);
 791         kfree(cm_id_priv->private_data);
 792         kfree(cm_id_priv);
 793 }
 794
 795 void ib_destroy_cm_id(struct ib_cm_id *cm_id)
 796 {
 797         cm_destroy_id(cm_id, 0);
 798 }
 799 EXPORT_SYMBOL(ib_destroy_cm_id);
 800
 801 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask,
 802                  struct ib_cm_compare_data *compare_data)
 803 {
 804         struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
 805         unsigned long flags;
 806         int ret = 0;
 807
 808         service_mask = service_mask ? service_mask :
 809                        __constant_cpu_to_be64(~0ULL);
 810         service_id &= service_mask;
 811         if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID &&
 812             (service_id != IB_CM_ASSIGN_SERVICE_ID))
 813                 return -EINVAL;
 814
 815         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
 816         if (cm_id->state != IB_CM_IDLE)
 817                 return -EINVAL;
 818
 819         if (compare_data) {
 820                 cm_id_priv->compare_data = kzalloc(sizeof *compare_data,
 821                                                    GFP_KERNEL);
 822                 if (!cm_id_priv->compare_data)
 823                         return -ENOMEM;
 824                 cm_mask_copy(cm_id_priv->compare_data->data,
 825                              compare_data->data, compare_data->mask);
 826                 memcpy(cm_id_priv->compare_data->mask, compare_data->mask,
 827                        IB_CM_COMPARE_SIZE);
 828         }
 829
 830         cm_id->state = IB_CM_LISTEN;
 831
 832         spin_lock_irqsave(&cm.lock, flags);
 833         if (service_id == IB_CM_ASSIGN_SERVICE_ID) {
 834                 cm_id->service_id = cpu_to_be64(cm.listen_service_id++);
 835                 cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
 836         } else {
 837                 cm_id->service_id = service_id;
 838                 cm_id->service_mask = service_mask;
 839         }
 840         cur_cm_id_priv = cm_insert_listen(cm_id_priv);
 841         spin_unlock_irqrestore(&cm.lock, flags);
 842
 843         if (cur_cm_id_priv) {
 844                 cm_id->state = IB_CM_IDLE;
 845                 kfree(cm_id_priv->compare_data);
 846                 cm_id_priv->compare_data = NULL;
 847                 ret = -EBUSY;
 848         }
 849         return ret;
 850 }
 851 EXPORT_SYMBOL(ib_cm_listen);
 852
 853 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv,
 854                           enum cm_msg_sequence msg_seq)
 855 {
 856         u64 hi_tid, low_tid;
 857
 858         hi_tid   = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32;
 859         low_tid  = (u64) ((__force u32)cm_id_priv->id.local_id |
 860                           (msg_seq << 30));
 861         return cpu_to_be64(hi_tid | low_tid);
 862 }
 863
 864 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr,
 865                               __be16 attr_id, __be64 tid)
 866 {
 867         hdr->base_version  = IB_MGMT_BASE_VERSION;
 868         hdr->mgmt_class    = IB_MGMT_CLASS_CM;
 869         hdr->class_version = IB_CM_CLASS_VERSION;
 870         hdr->method        = IB_MGMT_METHOD_SEND;
 871         hdr->attr_id       = attr_id;
 872         hdr->tid           = tid;
 873 }
 874
 875 static void cm_format_req(struct cm_req_msg *req_msg,
 876                           struct cm_id_private *cm_id_priv,
 877                           struct ib_cm_req_param *param)
 878 {
 879         cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID,
 880                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ));
 881
 882         req_msg->local_comm_id = cm_id_priv->id.local_id;
 883         req_msg->service_id = param->service_id;
 884         req_msg->local_ca_guid = cm_id_priv->id.device->node_guid;
 885         cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num));
 886         cm_req_set_resp_res(req_msg, param->responder_resources);
 887         cm_req_set_init_depth(req_msg, param->initiator_depth);
 888         cm_req_set_remote_resp_timeout(req_msg,
 889                                        param->remote_cm_response_timeout);
 890         cm_req_set_qp_type(req_msg, param->qp_type);
 891         cm_req_set_flow_ctrl(req_msg, param->flow_control);
 892         cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn));
 893         cm_req_set_local_resp_timeout(req_msg,
 894                                       param->local_cm_response_timeout);
 895         cm_req_set_retry_count(req_msg, param->retry_count);
 896         req_msg->pkey = param->primary_path->pkey;
 897         cm_req_set_path_mtu(req_msg, param->primary_path->mtu);
 898         cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count);
 899         cm_req_set_max_cm_retries(req_msg, param->max_cm_retries);
 900         cm_req_set_srq(req_msg, param->srq);
 901
 902         req_msg->primary_local_lid = param->primary_path->slid;
 903         req_msg->primary_remote_lid = param->primary_path->dlid;
 904         req_msg->primary_local_gid = param->primary_path->sgid;
 905         req_msg->primary_remote_gid = param->primary_path->dgid;
 906         cm_req_set_primary_flow_label(req_msg, param->primary_path->flow_label);
 907         cm_req_set_primary_packet_rate(req_msg, param->primary_path->rate);
 908         req_msg->primary_traffic_class = param->primary_path->traffic_class;
 909         req_msg->primary_hop_limit = param->primary_path->hop_limit;
 910         cm_req_set_primary_sl(req_msg, param->primary_path->sl);
 911         cm_req_set_primary_subnet_local(req_msg, 1); /* local only... */
 912         cm_req_set_primary_local_ack_timeout(req_msg,
 913                 min(31, param->primary_path->packet_life_time + 1));
 914
 915         if (param->alternate_path) {
 916                 req_msg->alt_local_lid = param->alternate_path->slid;
 917                 req_msg->alt_remote_lid = param->alternate_path->dlid;
 918                 req_msg->alt_local_gid = param->alternate_path->sgid;
 919                 req_msg->alt_remote_gid = param->alternate_path->dgid;
 920                 cm_req_set_alt_flow_label(req_msg,
 921                                           param->alternate_path->flow_label);
 922                 cm_req_set_alt_packet_rate(req_msg, param->alternate_path->rate);
 923                 req_msg->alt_traffic_class = param->alternate_path->traffic_class;
 924                 req_msg->alt_hop_limit = param->alternate_path->hop_limit;
 925                 cm_req_set_alt_sl(req_msg, param->alternate_path->sl);
 926                 cm_req_set_alt_subnet_local(req_msg, 1); /* local only... */
 927                 cm_req_set_alt_local_ack_timeout(req_msg,
 928                         min(31, param->alternate_path->packet_life_time + 1));
 929         }
 930
 931         if (param->private_data && param->private_data_len)
 932                 memcpy(req_msg->private_data, param->private_data,
 933                        param->private_data_len);
 934 }
 935
 936 static int cm_validate_req_param(struct ib_cm_req_param *param)
 937 {
 938         /* peer-to-peer not supported */
 939         if (param->peer_to_peer)
 940                 return -EINVAL;
 941
 942         if (!param->primary_path)
 943                 return -EINVAL;
 944
 945         if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC)
 946                 return -EINVAL;
 947
 948         if (param->private_data &&
 949             param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE)
 950                 return -EINVAL;
 951
 952         if (param->alternate_path &&
 953             (param->alternate_path->pkey != param->primary_path->pkey ||
 954              param->alternate_path->mtu != param->primary_path->mtu))
 955                 return -EINVAL;
 956
 957         return 0;
 958 }
 959
 960 int ib_send_cm_req(struct ib_cm_id *cm_id,
 961                    struct ib_cm_req_param *param)
 962 {
 963         struct cm_id_private *cm_id_priv;
 964         struct cm_req_msg *req_msg;
 965         unsigned long flags;
 966         int ret;
 967
 968         ret = cm_validate_req_param(param);
 969         if (ret)
 970                 return ret;
 971
 972         /* Verify that we're not in timewait. */
 973         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
 974         spin_lock_irqsave(&cm_id_priv->lock, flags);
 975         if (cm_id->state != IB_CM_IDLE) {
 976                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 977                 ret = -EINVAL;
 978                 goto out;
 979         }
 980         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 981
 982         cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
 983                                                             id.local_id);
 984         if (IS_ERR(cm_id_priv->timewait_info)) {
 985                 ret = PTR_ERR(cm_id_priv->timewait_info);
 986                 goto out;
 987         }
 988
 989         ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av);
 990         if (ret)
 991                 goto error1;
 992         if (param->alternate_path) {
 993                 ret = cm_init_av_by_path(param->alternate_path,
 994                                          &cm_id_priv->alt_av);
 995                 if (ret)
 996                         goto error1;
 997         }
 998         cm_id->service_id = param->service_id;
 999         cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
1000         cm_id_priv->timeout_ms = cm_convert_to_ms(
1001                                     param->primary_path->packet_life_time) * 2 +
1002                                  cm_convert_to_ms(
1003                                     param->remote_cm_response_timeout);
1004         cm_id_priv->max_cm_retries = param->max_cm_retries;
1005         cm_id_priv->initiator_depth = param->initiator_depth;
1006         cm_id_priv->responder_resources = param->responder_resources;
1007         cm_id_priv->retry_count = param->retry_count;
1008         cm_id_priv->path_mtu = param->primary_path->mtu;
1009         cm_id_priv->pkey = param->primary_path->pkey;
1010         cm_id_priv->qp_type = param->qp_type;
1011
1012         ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg);
1013         if (ret)
1014                 goto error1;
1015
1016         req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad;
1017         cm_format_req(req_msg, cm_id_priv, param);
1018         cm_id_priv->tid = req_msg->hdr.tid;
1019         cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms;
1020         cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT;
1021
1022         cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg);
1023         cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg);
1024
1025         spin_lock_irqsave(&cm_id_priv->lock, flags);
1026         ret = ib_post_send_mad(cm_id_priv->msg, NULL);
1027         if (ret) {
1028                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1029                 goto error2;
1030         }
1031         BUG_ON(cm_id->state != IB_CM_IDLE);
1032         cm_id->state = IB_CM_REQ_SENT;
1033         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1034         return 0;
1035
1036 error2: cm_free_msg(cm_id_priv->msg);
1037 error1: kfree(cm_id_priv->timewait_info);
1038 out:    return ret;
1039 }
1040 EXPORT_SYMBOL(ib_send_cm_req);
1041
1042 static int cm_issue_rej(struct cm_port *port,
1043                         struct ib_mad_recv_wc *mad_recv_wc,
1044                         enum ib_cm_rej_reason reason,
1045                         enum cm_msg_response msg_rejected,
1046                         void *ari, u8 ari_length)
1047 {
1048         struct ib_mad_send_buf *msg = NULL;
1049         struct cm_rej_msg *rej_msg, *rcv_msg;
1050         int ret;
1051
1052         ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
1053         if (ret)
1054                 return ret;
1055
1056         /* We just need common CM header information.  Cast to any message. */
1057         rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad;
1058         rej_msg = (struct cm_rej_msg *) msg->mad;
1059
1060         cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid);
1061         rej_msg->remote_comm_id = rcv_msg->local_comm_id;
1062         rej_msg->local_comm_id = rcv_msg->remote_comm_id;
1063         cm_rej_set_msg_rejected(rej_msg, msg_rejected);
1064         rej_msg->reason = cpu_to_be16(reason);
1065
1066         if (ari && ari_length) {
1067                 cm_rej_set_reject_info_len(rej_msg, ari_length);
1068                 memcpy(rej_msg->ari, ari, ari_length);
1069         }
1070
1071         ret = ib_post_send_mad(msg, NULL);
1072         if (ret)
1073                 cm_free_msg(msg);
1074
1075         return ret;
1076 }
1077
1078 static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid,
1079                                     __be32 local_qpn, __be32 remote_qpn)
1080 {
1081         return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) ||
1082                 ((local_ca_guid == remote_ca_guid) &&
1083                  (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn))));
1084 }
1085
1086 static void cm_format_paths_from_req(struct cm_req_msg *req_msg,
1087                                             struct ib_sa_path_rec *primary_path,
1088                                             struct ib_sa_path_rec *alt_path)
1089 {
1090         memset(primary_path, 0, sizeof *primary_path);
1091         primary_path->dgid = req_msg->primary_local_gid;
1092         primary_path->sgid = req_msg->primary_remote_gid;
1093         primary_path->dlid = req_msg->primary_local_lid;
1094         primary_path->slid = req_msg->primary_remote_lid;
1095         primary_path->flow_label = cm_req_get_primary_flow_label(req_msg);
1096         primary_path->hop_limit = req_msg->primary_hop_limit;
1097         primary_path->traffic_class = req_msg->primary_traffic_class;
1098         primary_path->reversible = 1;
1099         primary_path->pkey = req_msg->pkey;
1100         primary_path->sl = cm_req_get_primary_sl(req_msg);
1101         primary_path->mtu_selector = IB_SA_EQ;
1102         primary_path->mtu = cm_req_get_path_mtu(req_msg);
1103         primary_path->rate_selector = IB_SA_EQ;
1104         primary_path->rate = cm_req_get_primary_packet_rate(req_msg);
1105         primary_path->packet_life_time_selector = IB_SA_EQ;
1106         primary_path->packet_life_time =
1107                 cm_req_get_primary_local_ack_timeout(req_msg);
1108         primary_path->packet_life_time -= (primary_path->packet_life_time > 0);
1109
1110         if (req_msg->alt_local_lid) {
1111                 memset(alt_path, 0, sizeof *alt_path);
1112                 alt_path->dgid = req_msg->alt_local_gid;
1113                 alt_path->sgid = req_msg->alt_remote_gid;
1114                 alt_path->dlid = req_msg->alt_local_lid;
1115                 alt_path->slid = req_msg->alt_remote_lid;
1116                 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg);
1117                 alt_path->hop_limit = req_msg->alt_hop_limit;
1118                 alt_path->traffic_class = req_msg->alt_traffic_class;
1119                 alt_path->reversible = 1;
1120                 alt_path->pkey = req_msg->pkey;
1121                 alt_path->sl = cm_req_get_alt_sl(req_msg);
1122                 alt_path->mtu_selector = IB_SA_EQ;
1123                 alt_path->mtu = cm_req_get_path_mtu(req_msg);
1124                 alt_path->rate_selector = IB_SA_EQ;
1125                 alt_path->rate = cm_req_get_alt_packet_rate(req_msg);
1126                 alt_path->packet_life_time_selector = IB_SA_EQ;
1127                 alt_path->packet_life_time =
1128                         cm_req_get_alt_local_ack_timeout(req_msg);
1129                 alt_path->packet_life_time -= (alt_path->packet_life_time > 0);
1130         }
1131 }
1132
1133 static void cm_format_req_event(struct cm_work *work,
1134                                 struct cm_id_private *cm_id_priv,
1135                                 struct ib_cm_id *listen_id)
1136 {
1137         struct cm_req_msg *req_msg;
1138         struct ib_cm_req_event_param *param;
1139
1140         req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1141         param = &work->cm_event.param.req_rcvd;
1142         param->listen_id = listen_id;
1143         param->port = cm_id_priv->av.port->port_num;
1144         param->primary_path = &work->path[0];
1145         if (req_msg->alt_local_lid)
1146                 param->alternate_path = &work->path[1];
1147         else
1148                 param->alternate_path = NULL;
1149         param->remote_ca_guid = req_msg->local_ca_guid;
1150         param->remote_qkey = be32_to_cpu(req_msg->local_qkey);
1151         param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg));
1152         param->qp_type = cm_req_get_qp_type(req_msg);
1153         param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg));
1154         param->responder_resources = cm_req_get_init_depth(req_msg);
1155         param->initiator_depth = cm_req_get_resp_res(req_msg);
1156         param->local_cm_response_timeout =
1157                                         cm_req_get_remote_resp_timeout(req_msg);
1158         param->flow_control = cm_req_get_flow_ctrl(req_msg);
1159         param->remote_cm_response_timeout =
1160                                         cm_req_get_local_resp_timeout(req_msg);
1161         param->retry_count = cm_req_get_retry_count(req_msg);
1162         param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1163         param->srq = cm_req_get_srq(req_msg);
1164         work->cm_event.private_data = &req_msg->private_data;
1165 }
1166
1167 static void cm_process_work(struct cm_id_private *cm_id_priv,
1168                             struct cm_work *work)
1169 {
1170         unsigned long flags;
1171         int ret;
1172
1173         /* We will typically only have the current event to report. */
1174         ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
1175         cm_free_work(work);
1176
1177         while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) {
1178                 spin_lock_irqsave(&cm_id_priv->lock, flags);
1179                 work = cm_dequeue_work(cm_id_priv);
1180                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1181                 BUG_ON(!work);
1182                 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id,
1183                                                 &work->cm_event);
1184                 cm_free_work(work);
1185         }
1186         cm_deref_id(cm_id_priv);
1187         if (ret)
1188                 cm_destroy_id(&cm_id_priv->id, ret);
1189 }
1190
1191 static void cm_format_mra(struct cm_mra_msg *mra_msg,
1192                           struct cm_id_private *cm_id_priv,
1193                           enum cm_msg_response msg_mraed, u8 service_timeout,
1194                           const void *private_data, u8 private_data_len)
1195 {
1196         cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid);
1197         cm_mra_set_msg_mraed(mra_msg, msg_mraed);
1198         mra_msg->local_comm_id = cm_id_priv->id.local_id;
1199         mra_msg->remote_comm_id = cm_id_priv->id.remote_id;
1200         cm_mra_set_service_timeout(mra_msg, service_timeout);
1201
1202         if (private_data && private_data_len)
1203                 memcpy(mra_msg->private_data, private_data, private_data_len);
1204 }
1205
1206 static void cm_format_rej(struct cm_rej_msg *rej_msg,
1207                           struct cm_id_private *cm_id_priv,
1208                           enum ib_cm_rej_reason reason,
1209                           void *ari,
1210                           u8 ari_length,
1211                           const void *private_data,
1212                           u8 private_data_len)
1213 {
1214         cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid);
1215         rej_msg->remote_comm_id = cm_id_priv->id.remote_id;
1216
1217         switch(cm_id_priv->id.state) {
1218         case IB_CM_REQ_RCVD:
1219                 rej_msg->local_comm_id = 0;
1220                 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1221                 break;
1222         case IB_CM_MRA_REQ_SENT:
1223                 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1224                 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1225                 break;
1226         case IB_CM_REP_RCVD:
1227         case IB_CM_MRA_REP_SENT:
1228                 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1229                 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP);
1230                 break;
1231         default:
1232                 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1233                 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER);
1234                 break;
1235         }
1236
1237         rej_msg->reason = cpu_to_be16(reason);
1238         if (ari && ari_length) {
1239                 cm_rej_set_reject_info_len(rej_msg, ari_length);
1240                 memcpy(rej_msg->ari, ari, ari_length);
1241         }
1242
1243         if (private_data && private_data_len)
1244                 memcpy(rej_msg->private_data, private_data, private_data_len);
1245 }
1246
1247 static void cm_dup_req_handler(struct cm_work *work,
1248                                struct cm_id_private *cm_id_priv)
1249 {
1250         struct ib_mad_send_buf *msg = NULL;
1251         unsigned long flags;
1252         int ret;
1253
1254         /* Quick state check to discard duplicate REQs. */
1255         if (cm_id_priv->id.state == IB_CM_REQ_RCVD)
1256                 return;
1257
1258         ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1259         if (ret)
1260                 return;
1261
1262         spin_lock_irqsave(&cm_id_priv->lock, flags);
1263         switch (cm_id_priv->id.state) {
1264         case IB_CM_MRA_REQ_SENT:
1265                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1266                               CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout,
1267                               cm_id_priv->private_data,
1268                               cm_id_priv->private_data_len);
1269                 break;
1270         case IB_CM_TIMEWAIT:
1271                 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv,
1272                               IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0);
1273                 break;
1274         default:
1275                 goto unlock;
1276         }
1277         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1278
1279         ret = ib_post_send_mad(msg, NULL);
1280         if (ret)
1281                 goto free;
1282         return;
1283
1284 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1285 free:   cm_free_msg(msg);
1286 }
1287
1288 static struct cm_id_private * cm_match_req(struct cm_work *work,
1289                                            struct cm_id_private *cm_id_priv)
1290 {
1291         struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv;
1292         struct cm_timewait_info *timewait_info;
1293         struct cm_req_msg *req_msg;
1294         unsigned long flags;
1295
1296         req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1297
1298         /* Check for duplicate REQ and stale connections. */
1299         spin_lock_irqsave(&cm.lock, flags);
1300         timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info);
1301         if (!timewait_info)
1302                 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
1303
1304         if (timewait_info) {
1305                 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
1306                                            timewait_info->work.remote_id);
1307                 cm_cleanup_timewait(cm_id_priv->timewait_info);
1308                 spin_unlock_irqrestore(&cm.lock, flags);
1309                 if (cur_cm_id_priv) {
1310                         cm_dup_req_handler(work, cur_cm_id_priv);
1311                         cm_deref_id(cur_cm_id_priv);
1312                 } else
1313                         cm_issue_rej(work->port, work->mad_recv_wc,
1314                                      IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
1315                                      NULL, 0);
1316                 listen_cm_id_priv = NULL;
1317                 goto out;
1318         }
1319
1320         /* Find matching listen request. */
1321         listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device,
1322                                            req_msg->service_id,
1323                                            req_msg->private_data);
1324         if (!listen_cm_id_priv) {
1325                 cm_cleanup_timewait(cm_id_priv->timewait_info);
1326                 spin_unlock_irqrestore(&cm.lock, flags);
1327                 cm_issue_rej(work->port, work->mad_recv_wc,
1328                              IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ,
1329                              NULL, 0);
1330                 goto out;
1331         }
1332         atomic_inc(&listen_cm_id_priv->refcount);
1333         atomic_inc(&cm_id_priv->refcount);
1334         cm_id_priv->id.state = IB_CM_REQ_RCVD;
1335         atomic_inc(&cm_id_priv->work_count);
1336         spin_unlock_irqrestore(&cm.lock, flags);
1337 out:
1338         return listen_cm_id_priv;
1339 }
1340
1341 static int cm_req_handler(struct cm_work *work)
1342 {
1343         struct ib_cm_id *cm_id;
1344         struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
1345         struct cm_req_msg *req_msg;
1346         int ret;
1347
1348         req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1349
1350         cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL);
1351         if (IS_ERR(cm_id))
1352                 return PTR_ERR(cm_id);
1353
1354         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1355         cm_id_priv->id.remote_id = req_msg->local_comm_id;
1356         cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
1357                                 work->mad_recv_wc->recv_buf.grh,
1358                                 &cm_id_priv->av);
1359         cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1360                                                             id.local_id);
1361         if (IS_ERR(cm_id_priv->timewait_info)) {
1362                 ret = PTR_ERR(cm_id_priv->timewait_info);
1363                 goto destroy;
1364         }
1365         cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id;
1366         cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid;
1367         cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg);
1368
1369         listen_cm_id_priv = cm_match_req(work, cm_id_priv);
1370         if (!listen_cm_id_priv) {
1371                 ret = -EINVAL;
1372                 kfree(cm_id_priv->timewait_info);
1373                 goto destroy;
1374         }
1375
1376         cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
1377         cm_id_priv->id.context = listen_cm_id_priv->id.context;
1378         cm_id_priv->id.service_id = req_msg->service_id;
1379         cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL);
1380
1381         cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]);
1382         ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av);
1383         if (ret) {
1384                 ib_get_cached_gid(work->port->cm_dev->device,
1385                                   work->port->port_num, 0, &work->path[0].sgid);
1386                 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID,
1387                                &work->path[0].sgid, sizeof work->path[0].sgid,
1388                                NULL, 0);
1389                 goto rejected;
1390         }
1391         if (req_msg->alt_local_lid) {
1392                 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av);
1393                 if (ret) {
1394                         ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID,
1395                                        &work->path[0].sgid,
1396                                        sizeof work->path[0].sgid, NULL, 0);
1397                         goto rejected;
1398                 }
1399         }
1400         cm_id_priv->tid = req_msg->hdr.tid;
1401         cm_id_priv->timeout_ms = cm_convert_to_ms(
1402                                         cm_req_get_local_resp_timeout(req_msg));
1403         cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg);
1404         cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg);
1405         cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg);
1406         cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg);
1407         cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg);
1408         cm_id_priv->pkey = req_msg->pkey;
1409         cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg);
1410         cm_id_priv->retry_count = cm_req_get_retry_count(req_msg);
1411         cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1412         cm_id_priv->qp_type = cm_req_get_qp_type(req_msg);
1413
1414         cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
1415         cm_process_work(cm_id_priv, work);
1416         cm_deref_id(listen_cm_id_priv);
1417         return 0;
1418
1419 rejected:
1420         atomic_dec(&cm_id_priv->refcount);
1421         cm_deref_id(listen_cm_id_priv);
1422 destroy:
1423         ib_destroy_cm_id(cm_id);
1424         return ret;
1425 }
1426
1427 static void cm_format_rep(struct cm_rep_msg *rep_msg,
1428                           struct cm_id_private *cm_id_priv,
1429                           struct ib_cm_rep_param *param)
1430 {
1431         cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid);
1432         rep_msg->local_comm_id = cm_id_priv->id.local_id;
1433         rep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1434         cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num));
1435         cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn));
1436         rep_msg->resp_resources = param->responder_resources;
1437         rep_msg->initiator_depth = param->initiator_depth;
1438         cm_rep_set_target_ack_delay(rep_msg, param->target_ack_delay);
1439         cm_rep_set_failover(rep_msg, param->failover_accepted);
1440         cm_rep_set_flow_ctrl(rep_msg, param->flow_control);
1441         cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count);
1442         cm_rep_set_srq(rep_msg, param->srq);
1443         rep_msg->local_ca_guid = cm_id_priv->id.device->node_guid;
1444
1445         if (param->private_data && param->private_data_len)
1446                 memcpy(rep_msg->private_data, param->private_data,
1447                        param->private_data_len);
1448 }
1449
1450 int ib_send_cm_rep(struct ib_cm_id *cm_id,
1451                    struct ib_cm_rep_param *param)
1452 {
1453         struct cm_id_private *cm_id_priv;
1454         struct ib_mad_send_buf *msg;
1455         struct cm_rep_msg *rep_msg;
1456         unsigned long flags;
1457         int ret;
1458
1459         if (param->private_data &&
1460             param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE)
1461                 return -EINVAL;
1462
1463         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1464         spin_lock_irqsave(&cm_id_priv->lock, flags);
1465         if (cm_id->state != IB_CM_REQ_RCVD &&
1466             cm_id->state != IB_CM_MRA_REQ_SENT) {
1467                 ret = -EINVAL;
1468                 goto out;
1469         }
1470
1471         ret = cm_alloc_msg(cm_id_priv, &msg);
1472         if (ret)
1473                 goto out;
1474
1475         rep_msg = (struct cm_rep_msg *) msg->mad;
1476         cm_format_rep(rep_msg, cm_id_priv, param);
1477         msg->timeout_ms = cm_id_priv->timeout_ms;
1478         msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;
1479
1480         ret = ib_post_send_mad(msg, NULL);
1481         if (ret) {
1482                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1483                 cm_free_msg(msg);
1484                 return ret;
1485         }
1486
1487         cm_id->state = IB_CM_REP_SENT;
1488         cm_id_priv->msg = msg;
1489         cm_id_priv->initiator_depth = param->initiator_depth;
1490         cm_id_priv->responder_resources = param->responder_resources;
1491         cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg);
1492         cm_id_priv->local_qpn = cm_rep_get_local_qpn(rep_msg);
1493
1494 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1495         return ret;
1496 }
1497 EXPORT_SYMBOL(ib_send_cm_rep);
1498
1499 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg,
1500                           struct cm_id_private *cm_id_priv,
1501                           const void *private_data,
1502                           u8 private_data_len)
1503 {
1504         cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid);
1505         rtu_msg->local_comm_id = cm_id_priv->id.local_id;
1506         rtu_msg->remote_comm_id = cm_id_priv->id.remote_id;
1507
1508         if (private_data && private_data_len)
1509                 memcpy(rtu_msg->private_data, private_data, private_data_len);
1510 }
1511
1512 int ib_send_cm_rtu(struct ib_cm_id *cm_id,
1513                    const void *private_data,
1514                    u8 private_data_len)
1515 {
1516         struct cm_id_private *cm_id_priv;
1517         struct ib_mad_send_buf *msg;
1518         unsigned long flags;
1519         void *data;
1520         int ret;
1521
1522         if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE)
1523                 return -EINVAL;
1524
1525         data = cm_copy_private_data(private_data, private_data_len);
1526         if (IS_ERR(data))
1527                 return PTR_ERR(data);
1528
1529         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1530         spin_lock_irqsave(&cm_id_priv->lock, flags);
1531         if (cm_id->state != IB_CM_REP_RCVD &&
1532             cm_id->state != IB_CM_MRA_REP_SENT) {
1533                 ret = -EINVAL;
1534                 goto error;
1535         }
1536
1537         ret = cm_alloc_msg(cm_id_priv, &msg);
1538         if (ret)
1539                 goto error;
1540
1541         cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1542                       private_data, private_data_len);
1543
1544         ret = ib_post_send_mad(msg, NULL);
1545         if (ret) {
1546                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1547                 cm_free_msg(msg);
1548                 kfree(data);
1549                 return ret;
1550         }
1551
1552         cm_id->state = IB_CM_ESTABLISHED;
1553         cm_set_private_data(cm_id_priv, data, private_data_len);
1554         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1555         return 0;
1556
1557 error:  spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1558         kfree(data);
1559         return ret;
1560 }
1561 EXPORT_SYMBOL(ib_send_cm_rtu);
1562
1563 static void cm_format_rep_event(struct cm_work *work)
1564 {
1565         struct cm_rep_msg *rep_msg;
1566         struct ib_cm_rep_event_param *param;
1567
1568         rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1569         param = &work->cm_event.param.rep_rcvd;
1570         param->remote_ca_guid = rep_msg->local_ca_guid;
1571         param->remote_qkey = be32_to_cpu(rep_msg->local_qkey);
1572         param->remote_qpn = be32_to_cpu(cm_rep_get_local_qpn(rep_msg));
1573         param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg));
1574         param->responder_resources = rep_msg->initiator_depth;
1575         param->initiator_depth = rep_msg->resp_resources;
1576         param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
1577         param->failover_accepted = cm_rep_get_failover(rep_msg);
1578         param->flow_control = cm_rep_get_flow_ctrl(rep_msg);
1579         param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1580         param->srq = cm_rep_get_srq(rep_msg);
1581         work->cm_event.private_data = &rep_msg->private_data;
1582 }
1583
1584 static void cm_dup_rep_handler(struct cm_work *work)
1585 {
1586         struct cm_id_private *cm_id_priv;
1587         struct cm_rep_msg *rep_msg;
1588         struct ib_mad_send_buf *msg = NULL;
1589         unsigned long flags;
1590         int ret;
1591
1592         rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad;
1593         cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id,
1594                                    rep_msg->local_comm_id);
1595         if (!cm_id_priv)
1596                 return;
1597
1598         ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1599         if (ret)
1600                 goto deref;
1601
1602         spin_lock_irqsave(&cm_id_priv->lock, flags);
1603         if (cm_id_priv->id.state == IB_CM_ESTABLISHED)
1604                 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1605                               cm_id_priv->private_data,
1606                               cm_id_priv->private_data_len);
1607         else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT)
1608                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1609                               CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout,
1610                               cm_id_priv->private_data,
1611                               cm_id_priv->private_data_len);
1612         else
1613                 goto unlock;
1614         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1615
1616         ret = ib_post_send_mad(msg, NULL);
1617         if (ret)
1618                 goto free;
1619         goto deref;
1620
1621 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1622 free:   cm_free_msg(msg);
1623 deref:  cm_deref_id(cm_id_priv);
1624 }
1625
1626 static int cm_rep_handler(struct cm_work *work)
1627 {
1628         struct cm_id_private *cm_id_priv;
1629         struct cm_rep_msg *rep_msg;
1630         unsigned long flags;
1631         int ret;
1632
1633         rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1634         cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0);
1635         if (!cm_id_priv) {
1636                 cm_dup_rep_handler(work);
1637                 return -EINVAL;
1638         }
1639
1640         cm_format_rep_event(work);
1641
1642         spin_lock_irqsave(&cm_id_priv->lock, flags);
1643         switch (cm_id_priv->id.state) {
1644         case IB_CM_REQ_SENT:
1645         case IB_CM_MRA_REQ_RCVD:
1646                 break;
1647         default:
1648                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1649                 ret = -EINVAL;
1650                 goto error;
1651         }
1652
1653         cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id;
1654         cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid;
1655         cm_id_priv->timewait_info->remote_qpn = cm_rep_get_local_qpn(rep_msg);
1656
1657         spin_lock(&cm.lock);
1658         /* Check for duplicate REP. */
1659         if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
1660                 spin_unlock(&cm.lock);
1661                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1662                 ret = -EINVAL;
1663                 goto error;
1664         }
1665         /* Check for a stale connection. */
1666         if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) {
1667                 rb_erase(&cm_id_priv->timewait_info->remote_id_node,
1668                          &cm.remote_id_table);
1669                 cm_id_priv->timewait_info->inserted_remote_id = 0;
1670                 spin_unlock(&cm.lock);
1671                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1672                 cm_issue_rej(work->port, work->mad_recv_wc,
1673                              IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP,
1674                              NULL, 0);
1675                 ret = -EINVAL;
1676                 goto error;
1677         }
1678         spin_unlock(&cm.lock);
1679
1680         cm_id_priv->id.state = IB_CM_REP_RCVD;
1681         cm_id_priv->id.remote_id = rep_msg->local_comm_id;
1682         cm_id_priv->remote_qpn = cm_rep_get_local_qpn(rep_msg);
1683         cm_id_priv->initiator_depth = rep_msg->resp_resources;
1684         cm_id_priv->responder_resources = rep_msg->initiator_depth;
1685         cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg);
1686         cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1687
1688         /* todo: handle peer_to_peer */
1689
1690         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1691         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1692         if (!ret)
1693                 list_add_tail(&work->list, &cm_id_priv->work_list);
1694         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1695
1696         if (ret)
1697                 cm_process_work(cm_id_priv, work);
1698         else
1699                 cm_deref_id(cm_id_priv);
1700         return 0;
1701
1702 error:
1703         cm_deref_id(cm_id_priv);
1704         return ret;
1705 }
1706
1707 static int cm_establish_handler(struct cm_work *work)
1708 {
1709         struct cm_id_private *cm_id_priv;
1710         unsigned long flags;
1711         int ret;
1712
1713         /* See comment in cm_establish about lookup. */
1714         cm_id_priv = cm_acquire_id(work->local_id, work->remote_id);
1715         if (!cm_id_priv)
1716                 return -EINVAL;
1717
1718         spin_lock_irqsave(&cm_id_priv->lock, flags);
1719         if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
1720                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1721                 goto out;
1722         }
1723
1724         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1725         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1726         if (!ret)
1727                 list_add_tail(&work->list, &cm_id_priv->work_list);
1728         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1729
1730         if (ret)
1731                 cm_process_work(cm_id_priv, work);
1732         else
1733                 cm_deref_id(cm_id_priv);
1734         return 0;
1735 out:
1736         cm_deref_id(cm_id_priv);
1737         return -EINVAL;
1738 }
1739
1740 static int cm_rtu_handler(struct cm_work *work)
1741 {
1742         struct cm_id_private *cm_id_priv;
1743         struct cm_rtu_msg *rtu_msg;
1744         unsigned long flags;
1745         int ret;
1746
1747         rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad;
1748         cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id,
1749                                    rtu_msg->local_comm_id);
1750         if (!cm_id_priv)
1751                 return -EINVAL;
1752
1753         work->cm_event.private_data = &rtu_msg->private_data;
1754
1755         spin_lock_irqsave(&cm_id_priv->lock, flags);
1756         if (cm_id_priv->id.state != IB_CM_REP_SENT &&
1757             cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
1758                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1759                 goto out;
1760         }
1761         cm_id_priv->id.state = IB_CM_ESTABLISHED;
1762
1763         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1764         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1765         if (!ret)
1766                 list_add_tail(&work->list, &cm_id_priv->work_list);
1767         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1768
1769         if (ret)
1770                 cm_process_work(cm_id_priv, work);
1771         else
1772                 cm_deref_id(cm_id_priv);
1773         return 0;
1774 out:
1775         cm_deref_id(cm_id_priv);
1776         return -EINVAL;
1777 }
1778
1779 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg,
1780                           struct cm_id_private *cm_id_priv,
1781                           const void *private_data,
1782                           u8 private_data_len)
1783 {
1784         cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID,
1785                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ));
1786         dreq_msg->local_comm_id = cm_id_priv->id.local_id;
1787         dreq_msg->remote_comm_id = cm_id_priv->id.remote_id;
1788         cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn);
1789
1790         if (private_data && private_data_len)
1791                 memcpy(dreq_msg->private_data, private_data, private_data_len);
1792 }
1793
1794 int ib_send_cm_dreq(struct ib_cm_id *cm_id,
1795                     const void *private_data,
1796                     u8 private_data_len)
1797 {
1798         struct cm_id_private *cm_id_priv;
1799         struct ib_mad_send_buf *msg;
1800         unsigned long flags;
1801         int ret;
1802
1803         if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE)
1804                 return -EINVAL;
1805
1806         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1807         spin_lock_irqsave(&cm_id_priv->lock, flags);
1808         if (cm_id->state != IB_CM_ESTABLISHED) {
1809                 ret = -EINVAL;
1810                 goto out;
1811         }
1812
1813         ret = cm_alloc_msg(cm_id_priv, &msg);
1814         if (ret) {
1815                 cm_enter_timewait(cm_id_priv);
1816                 goto out;
1817         }
1818
1819         cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv,
1820                        private_data, private_data_len);
1821         msg->timeout_ms = cm_id_priv->timeout_ms;
1822         msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
1823
1824         ret = ib_post_send_mad(msg, NULL);
1825         if (ret) {
1826                 cm_enter_timewait(cm_id_priv);
1827                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1828                 cm_free_msg(msg);
1829                 return ret;
1830         }
1831
1832         cm_id->state = IB_CM_DREQ_SENT;
1833         cm_id_priv->msg = msg;
1834 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1835         return ret;
1836 }
1837 EXPORT_SYMBOL(ib_send_cm_dreq);
1838
1839 static void cm_format_drep(struct cm_drep_msg *drep_msg,
1840                           struct cm_id_private *cm_id_priv,
1841                           const void *private_data,
1842                           u8 private_data_len)
1843 {
1844         cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid);
1845         drep_msg->local_comm_id = cm_id_priv->id.local_id;
1846         drep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1847
1848         if (private_data && private_data_len)
1849                 memcpy(drep_msg->private_data, private_data, private_data_len);
1850 }
1851
1852 int ib_send_cm_drep(struct ib_cm_id *cm_id,
1853                     const void *private_data,
1854                     u8 private_data_len)
1855 {
1856         struct cm_id_private *cm_id_priv;
1857         struct ib_mad_send_buf *msg;
1858         unsigned long flags;
1859         void *data;
1860         int ret;
1861
1862         if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
1863                 return -EINVAL;
1864
1865         data = cm_copy_private_data(private_data, private_data_len);
1866         if (IS_ERR(data))
1867                 return PTR_ERR(data);
1868
1869         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1870         spin_lock_irqsave(&cm_id_priv->lock, flags);
1871         if (cm_id->state != IB_CM_DREQ_RCVD) {
1872                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1873                 kfree(data);
1874                 return -EINVAL;
1875         }
1876
1877         cm_set_private_data(cm_id_priv, data, private_data_len);
1878         cm_enter_timewait(cm_id_priv);
1879
1880         ret = cm_alloc_msg(cm_id_priv, &msg);
1881         if (ret)
1882                 goto out;
1883
1884         cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
1885                        private_data, private_data_len);
1886
1887         ret = ib_post_send_mad(msg, NULL);
1888         if (ret) {
1889                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1890                 cm_free_msg(msg);
1891                 return ret;
1892         }
1893
1894 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1895         return ret;
1896 }
1897 EXPORT_SYMBOL(ib_send_cm_drep);
1898
1899 static int cm_issue_drep(struct cm_port *port,
1900                          struct ib_mad_recv_wc *mad_recv_wc)
1901 {
1902         struct ib_mad_send_buf *msg = NULL;
1903         struct cm_dreq_msg *dreq_msg;
1904         struct cm_drep_msg *drep_msg;
1905         int ret;
1906
1907         ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
1908         if (ret)
1909                 return ret;
1910
1911         dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad;
1912         drep_msg = (struct cm_drep_msg *) msg->mad;
1913
1914         cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid);
1915         drep_msg->remote_comm_id = dreq_msg->local_comm_id;
1916         drep_msg->local_comm_id = dreq_msg->remote_comm_id;
1917
1918         ret = ib_post_send_mad(msg, NULL);
1919         if (ret)
1920                 cm_free_msg(msg);
1921
1922         return ret;
1923 }
1924
1925 static int cm_dreq_handler(struct cm_work *work)
1926 {
1927         struct cm_id_private *cm_id_priv;
1928         struct cm_dreq_msg *dreq_msg;
1929         struct ib_mad_send_buf *msg = NULL;
1930         unsigned long flags;
1931         int ret;
1932
1933         dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
1934         cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id,
1935                                    dreq_msg->local_comm_id);
1936         if (!cm_id_priv) {
1937                 cm_issue_drep(work->port, work->mad_recv_wc);
1938                 return -EINVAL;
1939         }
1940
1941         work->cm_event.private_data = &dreq_msg->private_data;
1942
1943         spin_lock_irqsave(&cm_id_priv->lock, flags);
1944         if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg))
1945                 goto unlock;
1946
1947         switch (cm_id_priv->id.state) {
1948         case IB_CM_REP_SENT:
1949         case IB_CM_DREQ_SENT:
1950                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1951                 break;
1952         case IB_CM_ESTABLISHED:
1953         case IB_CM_MRA_REP_RCVD:
1954                 break;
1955         case IB_CM_TIMEWAIT:
1956                 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
1957                         goto unlock;
1958
1959                 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
1960                                cm_id_priv->private_data,
1961                                cm_id_priv->private_data_len);
1962                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1963
1964                 if (ib_post_send_mad(msg, NULL))
1965                         cm_free_msg(msg);
1966                 goto deref;
1967         default:
1968                 goto unlock;
1969         }
1970         cm_id_priv->id.state = IB_CM_DREQ_RCVD;
1971         cm_id_priv->tid = dreq_msg->hdr.tid;
1972         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1973         if (!ret)
1974                 list_add_tail(&work->list, &cm_id_priv->work_list);
1975         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1976
1977         if (ret)
1978                 cm_process_work(cm_id_priv, work);
1979         else
1980                 cm_deref_id(cm_id_priv);
1981         return 0;
1982
1983 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1984 deref:  cm_deref_id(cm_id_priv);
1985         return -EINVAL;
1986 }
1987
1988 static int cm_drep_handler(struct cm_work *work)
1989 {
1990         struct cm_id_private *cm_id_priv;
1991         struct cm_drep_msg *drep_msg;
1992         unsigned long flags;
1993         int ret;
1994
1995         drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
1996         cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id,
1997                                    drep_msg->local_comm_id);
1998         if (!cm_id_priv)
1999                 return -EINVAL;
2000
2001         work->cm_event.private_data = &drep_msg->private_data;
2002
2003         spin_lock_irqsave(&cm_id_priv->lock, flags);
2004         if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
2005             cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
2006                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2007                 goto out;
2008         }
2009         cm_enter_timewait(cm_id_priv);
2010
2011         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2012         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2013         if (!ret)
2014                 list_add_tail(&work->list, &cm_id_priv->work_list);
2015         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2016
2017         if (ret)
2018                 cm_process_work(cm_id_priv, work);
2019         else
2020                 cm_deref_id(cm_id_priv);
2021         return 0;
2022 out:
2023         cm_deref_id(cm_id_priv);
2024         return -EINVAL;
2025 }
2026
2027 int ib_send_cm_rej(struct ib_cm_id *cm_id,
2028                    enum ib_cm_rej_reason reason,
2029                    void *ari,
2030                    u8 ari_length,
2031                    const void *private_data,
2032                    u8 private_data_len)
2033 {
2034         struct cm_id_private *cm_id_priv;
2035         struct ib_mad_send_buf *msg;
2036         unsigned long flags;
2037         int ret;
2038
2039         if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
2040             (ari && ari_length > IB_CM_REJ_ARI_LENGTH))
2041                 return -EINVAL;
2042
2043         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2044
2045         spin_lock_irqsave(&cm_id_priv->lock, flags);
2046         switch (cm_id->state) {
2047         case IB_CM_REQ_SENT:
2048         case IB_CM_MRA_REQ_RCVD:
2049         case IB_CM_REQ_RCVD:
2050         case IB_CM_MRA_REQ_SENT:
2051         case IB_CM_REP_RCVD:
2052         case IB_CM_MRA_REP_SENT:
2053                 ret = cm_alloc_msg(cm_id_priv, &msg);
2054                 if (!ret)
2055                         cm_format_rej((struct cm_rej_msg *) msg->mad,
2056                                       cm_id_priv, reason, ari, ari_length,
2057                                       private_data, private_data_len);
2058
2059                 cm_reset_to_idle(cm_id_priv);
2060                 break;
2061         case IB_CM_REP_SENT:
2062         case IB_CM_MRA_REP_RCVD:
2063                 ret = cm_alloc_msg(cm_id_priv, &msg);
2064                 if (!ret)
2065                         cm_format_rej((struct cm_rej_msg *) msg->mad,
2066                                       cm_id_priv, reason, ari, ari_length,
2067                                       private_data, private_data_len);
2068
2069                 cm_enter_timewait(cm_id_priv);
2070                 break;
2071         default:
2072                 ret = -EINVAL;
2073                 goto out;
2074         }
2075
2076         if (ret)
2077                 goto out;
2078
2079         ret = ib_post_send_mad(msg, NULL);
2080         if (ret)
2081                 cm_free_msg(msg);
2082
2083 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2084         return ret;
2085 }
2086 EXPORT_SYMBOL(ib_send_cm_rej);
2087
2088 static void cm_format_rej_event(struct cm_work *work)
2089 {
2090         struct cm_rej_msg *rej_msg;
2091         struct ib_cm_rej_event_param *param;
2092
2093         rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2094         param = &work->cm_event.param.rej_rcvd;
2095         param->ari = rej_msg->ari;
2096         param->ari_length = cm_rej_get_reject_info_len(rej_msg);
2097         param->reason = __be16_to_cpu(rej_msg->reason);
2098         work->cm_event.private_data = &rej_msg->private_data;
2099 }
2100
2101 static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
2102 {
2103         struct cm_timewait_info *timewait_info;
2104         struct cm_id_private *cm_id_priv;
2105         unsigned long flags;
2106         __be32 remote_id;
2107
2108         remote_id = rej_msg->local_comm_id;
2109
2110         if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) {
2111                 spin_lock_irqsave(&cm.lock, flags);
2112                 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari),
2113                                                   remote_id);
2114                 if (!timewait_info) {
2115                         spin_unlock_irqrestore(&cm.lock, flags);
2116                         return NULL;
2117                 }
2118                 cm_id_priv = idr_find(&cm.local_id_table, (__force int)
2119                                       (timewait_info->work.local_id ^
2120                                        cm.random_id_operand));
2121                 if (cm_id_priv) {
2122                         if (cm_id_priv->id.remote_id == remote_id)
2123                                 atomic_inc(&cm_id_priv->refcount);
2124                         else
2125                                 cm_id_priv = NULL;
2126                 }
2127                 spin_unlock_irqrestore(&cm.lock, flags);
2128         } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ)
2129                 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0);
2130         else
2131                 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id);
2132
2133         return cm_id_priv;
2134 }
2135
2136 static int cm_rej_handler(struct cm_work *work)
2137 {
2138         struct cm_id_private *cm_id_priv;
2139         struct cm_rej_msg *rej_msg;
2140         unsigned long flags;
2141         int ret;
2142
2143         rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2144         cm_id_priv = cm_acquire_rejected_id(rej_msg);
2145         if (!cm_id_priv)
2146                 return -EINVAL;
2147
2148         cm_format_rej_event(work);
2149
2150         spin_lock_irqsave(&cm_id_priv->lock, flags);
2151         switch (cm_id_priv->id.state) {
2152         case IB_CM_REQ_SENT:
2153         case IB_CM_MRA_REQ_RCVD:
2154         case IB_CM_REP_SENT:
2155         case IB_CM_MRA_REP_RCVD:
2156                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2157                 /* fall through */
2158         case IB_CM_REQ_RCVD:
2159         case IB_CM_MRA_REQ_SENT:
2160                 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN)
2161                         cm_enter_timewait(cm_id_priv);
2162                 else
2163                         cm_reset_to_idle(cm_id_priv);
2164                 break;
2165         case IB_CM_DREQ_SENT:
2166                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2167                 /* fall through */
2168         case IB_CM_REP_RCVD:
2169         case IB_CM_MRA_REP_SENT:
2170         case IB_CM_ESTABLISHED:
2171                 cm_enter_timewait(cm_id_priv);
2172                 break;
2173         default:
2174                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2175                 ret = -EINVAL;
2176                 goto out;
2177         }
2178
2179         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2180         if (!ret)
2181                 list_add_tail(&work->list, &cm_id_priv->work_list);
2182         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2183
2184         if (ret)
2185                 cm_process_work(cm_id_priv, work);
2186         else
2187                 cm_deref_id(cm_id_priv);
2188         return 0;
2189 out:
2190         cm_deref_id(cm_id_priv);
2191         return -EINVAL;
2192 }
2193
2194 int ib_send_cm_mra(struct ib_cm_id *cm_id,
2195                    u8 service_timeout,
2196                    const void *private_data,
2197                    u8 private_data_len)
2198 {
2199         struct cm_id_private *cm_id_priv;
2200         struct ib_mad_send_buf *msg;
2201         void *data;
2202         unsigned long flags;
2203         int ret;
2204
2205         if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE)
2206                 return -EINVAL;
2207
2208         data = cm_copy_private_data(private_data, private_data_len);
2209         if (IS_ERR(data))
2210                 return PTR_ERR(data);
2211
2212         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2213
2214         spin_lock_irqsave(&cm_id_priv->lock, flags);
2215         switch(cm_id_priv->id.state) {
2216         case IB_CM_REQ_RCVD:
2217                 ret = cm_alloc_msg(cm_id_priv, &msg);
2218                 if (ret)
2219                         goto error1;
2220
2221                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2222                               CM_MSG_RESPONSE_REQ, service_timeout,
2223                               private_data, private_data_len);
2224                 ret = ib_post_send_mad(msg, NULL);
2225                 if (ret)
2226                         goto error2;
2227                 cm_id->state = IB_CM_MRA_REQ_SENT;
2228                 break;
2229         case IB_CM_REP_RCVD:
2230                 ret = cm_alloc_msg(cm_id_priv, &msg);
2231                 if (ret)
2232                         goto error1;
2233
2234                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2235                               CM_MSG_RESPONSE_REP, service_timeout,
2236                               private_data, private_data_len);
2237                 ret = ib_post_send_mad(msg, NULL);
2238                 if (ret)
2239                         goto error2;
2240                 cm_id->state = IB_CM_MRA_REP_SENT;
2241                 break;
2242         case IB_CM_ESTABLISHED:
2243                 ret = cm_alloc_msg(cm_id_priv, &msg);
2244                 if (ret)
2245                         goto error1;
2246
2247                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2248                               CM_MSG_RESPONSE_OTHER, service_timeout,
2249                               private_data, private_data_len);
2250                 ret = ib_post_send_mad(msg, NULL);
2251                 if (ret)
2252                         goto error2;
2253                 cm_id->lap_state = IB_CM_MRA_LAP_SENT;
2254                 break;
2255         default:
2256                 ret = -EINVAL;
2257                 goto error1;
2258         }
2259         cm_id_priv->service_timeout = service_timeout;
2260         cm_set_private_data(cm_id_priv, data, private_data_len);
2261         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2262         return 0;
2263
2264 error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2265         kfree(data);
2266         return ret;
2267
2268 error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2269         kfree(data);
2270         cm_free_msg(msg);
2271         return ret;
2272 }
2273 EXPORT_SYMBOL(ib_send_cm_mra);
2274
2275 static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
2276 {
2277         switch (cm_mra_get_msg_mraed(mra_msg)) {
2278         case CM_MSG_RESPONSE_REQ:
2279                 return cm_acquire_id(mra_msg->remote_comm_id, 0);
2280         case CM_MSG_RESPONSE_REP:
2281         case CM_MSG_RESPONSE_OTHER:
2282                 return cm_acquire_id(mra_msg->remote_comm_id,
2283                                      mra_msg->local_comm_id);
2284         default:
2285                 return NULL;
2286         }
2287 }
2288
2289 static int cm_mra_handler(struct cm_work *work)
2290 {
2291         struct cm_id_private *cm_id_priv;
2292         struct cm_mra_msg *mra_msg;
2293         unsigned long flags;
2294         int timeout, ret;
2295
2296         mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
2297         cm_id_priv = cm_acquire_mraed_id(mra_msg);
2298         if (!cm_id_priv)
2299                 return -EINVAL;
2300
2301         work->cm_event.private_data = &mra_msg->private_data;
2302         work->cm_event.param.mra_rcvd.service_timeout =
2303                                         cm_mra_get_service_timeout(mra_msg);
2304         timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) +
2305                   cm_convert_to_ms(cm_id_priv->av.packet_life_time);
2306
2307         spin_lock_irqsave(&cm_id_priv->lock, flags);
2308         switch (cm_id_priv->id.state) {
2309         case IB_CM_REQ_SENT:
2310                 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ ||
2311                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
2312                                   cm_id_priv->msg, timeout))
2313                         goto out;
2314                 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
2315                 break;
2316         case IB_CM_REP_SENT:
2317                 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP ||
2318                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
2319                                   cm_id_priv->msg, timeout))
2320                         goto out;
2321                 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
2322                 break;
2323         case IB_CM_ESTABLISHED:
2324                 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER ||
2325                     cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
2326                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
2327                                   cm_id_priv->msg, timeout))
2328                         goto out;
2329                 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
2330                 break;
2331         default:
2332                 goto out;
2333         }
2334
2335         cm_id_priv->msg->context[1] = (void *) (unsigned long)
2336                                       cm_id_priv->id.state;
2337         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2338         if (!ret)
2339                 list_add_tail(&work->list, &cm_id_priv->work_list);
2340         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2341
2342         if (ret)
2343                 cm_process_work(cm_id_priv, work);
2344         else
2345                 cm_deref_id(cm_id_priv);
2346         return 0;
2347 out:
2348         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2349         cm_deref_id(cm_id_priv);
2350         return -EINVAL;
2351 }
2352
2353 static void cm_format_lap(struct cm_lap_msg *lap_msg,
2354                           struct cm_id_private *cm_id_priv,
2355                           struct ib_sa_path_rec *alternate_path,
2356                           const void *private_data,
2357                           u8 private_data_len)
2358 {
2359         cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID,
2360                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP));
2361         lap_msg->local_comm_id = cm_id_priv->id.local_id;
2362         lap_msg->remote_comm_id = cm_id_priv->id.remote_id;
2363         cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn);
2364         /* todo: need remote CM response timeout */
2365         cm_lap_set_remote_resp_timeout(lap_msg, 0x1F);
2366         lap_msg->alt_local_lid = alternate_path->slid;
2367         lap_msg->alt_remote_lid = alternate_path->dlid;
2368         lap_msg->alt_local_gid = alternate_path->sgid;
2369         lap_msg->alt_remote_gid = alternate_path->dgid;
2370         cm_lap_set_flow_label(lap_msg, alternate_path->flow_label);
2371         cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class);
2372         lap_msg->alt_hop_limit = alternate_path->hop_limit;
2373         cm_lap_set_packet_rate(lap_msg, alternate_path->rate);
2374         cm_lap_set_sl(lap_msg, alternate_path->sl);
2375         cm_lap_set_subnet_local(lap_msg, 1); /* local only... */
2376         cm_lap_set_local_ack_timeout(lap_msg,
2377                 min(31, alternate_path->packet_life_time + 1));
2378
2379         if (private_data && private_data_len)
2380                 memcpy(lap_msg->private_data, private_data, private_data_len);
2381 }
2382
2383 int ib_send_cm_lap(struct ib_cm_id *cm_id,
2384                    struct ib_sa_path_rec *alternate_path,
2385                    const void *private_data,
2386                    u8 private_data_len)
2387 {
2388         struct cm_id_private *cm_id_priv;
2389         struct ib_mad_send_buf *msg;
2390         unsigned long flags;
2391         int ret;
2392
2393         if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE)
2394                 return -EINVAL;
2395
2396         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2397         spin_lock_irqsave(&cm_id_priv->lock, flags);
2398         if (cm_id->state != IB_CM_ESTABLISHED ||
2399             (cm_id->lap_state != IB_CM_LAP_UNINIT &&
2400              cm_id->lap_state != IB_CM_LAP_IDLE)) {
2401                 ret = -EINVAL;
2402                 goto out;
2403         }
2404
2405         ret = cm_init_av_by_path(alternate_path, &cm_id_priv->alt_av);
2406         if (ret)
2407                 goto out;
2408
2409         ret = cm_alloc_msg(cm_id_priv, &msg);
2410         if (ret)
2411                 goto out;
2412
2413         cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv,
2414                       alternate_path, private_data, private_data_len);
2415         msg->timeout_ms = cm_id_priv->timeout_ms;
2416         msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED;
2417
2418         ret = ib_post_send_mad(msg, NULL);
2419         if (ret) {
2420                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2421                 cm_free_msg(msg);
2422                 return ret;
2423         }
2424
2425         cm_id->lap_state = IB_CM_LAP_SENT;
2426         cm_id_priv->msg = msg;
2427
2428 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2429         return ret;
2430 }
2431 EXPORT_SYMBOL(ib_send_cm_lap);
2432
2433 static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv,
2434                                     struct ib_sa_path_rec *path,
2435                                     struct cm_lap_msg *lap_msg)
2436 {
2437         memset(path, 0, sizeof *path);
2438         path->dgid = lap_msg->alt_local_gid;
2439         path->sgid = lap_msg->alt_remote_gid;
2440         path->dlid = lap_msg->alt_local_lid;
2441         path->slid = lap_msg->alt_remote_lid;
2442         path->flow_label = cm_lap_get_flow_label(lap_msg);
2443         path->hop_limit = lap_msg->alt_hop_limit;
2444         path->traffic_class = cm_lap_get_traffic_class(lap_msg);
2445         path->reversible = 1;
2446         path->pkey = cm_id_priv->pkey;
2447         path->sl = cm_lap_get_sl(lap_msg);
2448         path->mtu_selector = IB_SA_EQ;
2449         path->mtu = cm_id_priv->path_mtu;
2450         path->rate_selector = IB_SA_EQ;
2451         path->rate = cm_lap_get_packet_rate(lap_msg);
2452         path->packet_life_time_selector = IB_SA_EQ;
2453         path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg);
2454         path->packet_life_time -= (path->packet_life_time > 0);
2455 }
2456
2457 static int cm_lap_handler(struct cm_work *work)
2458 {
2459         struct cm_id_private *cm_id_priv;
2460         struct cm_lap_msg *lap_msg;
2461         struct ib_cm_lap_event_param *param;
2462         struct ib_mad_send_buf *msg = NULL;
2463         unsigned long flags;
2464         int ret;
2465
2466         /* todo: verify LAP request and send reject APR if invalid. */
2467         lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
2468         cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id,
2469                                    lap_msg->local_comm_id);
2470         if (!cm_id_priv)
2471                 return -EINVAL;
2472
2473         param = &work->cm_event.param.lap_rcvd;
2474         param->alternate_path = &work->path[0];
2475         cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg);
2476         work->cm_event.private_data = &lap_msg->private_data;
2477
2478         spin_lock_irqsave(&cm_id_priv->lock, flags);
2479         if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
2480                 goto unlock;
2481
2482         switch (cm_id_priv->id.lap_state) {
2483         case IB_CM_LAP_UNINIT:
2484         case IB_CM_LAP_IDLE:
2485                 break;
2486         case IB_CM_MRA_LAP_SENT:
2487                 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2488                         goto unlock;
2489
2490                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2491                               CM_MSG_RESPONSE_OTHER,
2492                               cm_id_priv->service_timeout,
2493                               cm_id_priv->private_data,
2494                               cm_id_priv->private_data_len);
2495                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2496
2497                 if (ib_post_send_mad(msg, NULL))
2498                         cm_free_msg(msg);
2499                 goto deref;
2500         default:
2501                 goto unlock;
2502         }
2503
2504         cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
2505         cm_id_priv->tid = lap_msg->hdr.tid;
2506         cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2507                                 work->mad_recv_wc->recv_buf.grh,
2508                                 &cm_id_priv->av);
2509         cm_init_av_by_path(param->alternate_path, &cm_id_priv->alt_av);
2510         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2511         if (!ret)
2512                 list_add_tail(&work->list, &cm_id_priv->work_list);
2513         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2514
2515         if (ret)
2516                 cm_process_work(cm_id_priv, work);
2517         else
2518                 cm_deref_id(cm_id_priv);
2519         return 0;
2520
2521 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2522 deref:  cm_deref_id(cm_id_priv);
2523         return -EINVAL;
2524 }
2525
2526 static void cm_format_apr(struct cm_apr_msg *apr_msg,
2527                           struct cm_id_private *cm_id_priv,
2528                           enum ib_cm_apr_status status,
2529                           void *info,
2530                           u8 info_length,
2531                           const void *private_data,
2532                           u8 private_data_len)
2533 {
2534         cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid);
2535         apr_msg->local_comm_id = cm_id_priv->id.local_id;
2536         apr_msg->remote_comm_id = cm_id_priv->id.remote_id;
2537         apr_msg->ap_status = (u8) status;
2538
2539         if (info && info_length) {
2540                 apr_msg->info_length = info_length;
2541                 memcpy(apr_msg->info, info, info_length);
2542         }
2543
2544         if (private_data && private_data_len)
2545                 memcpy(apr_msg->private_data, private_data, private_data_len);
2546 }
2547
2548 int ib_send_cm_apr(struct ib_cm_id *cm_id,
2549                    enum ib_cm_apr_status status,
2550                    void *info,
2551                    u8 info_length,
2552                    const void *private_data,
2553                    u8 private_data_len)
2554 {
2555         struct cm_id_private *cm_id_priv;
2556         struct ib_mad_send_buf *msg;
2557         unsigned long flags;
2558         int ret;
2559
2560         if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) ||
2561             (info && info_length > IB_CM_APR_INFO_LENGTH))
2562                 return -EINVAL;
2563
2564         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2565         spin_lock_irqsave(&cm_id_priv->lock, flags);
2566         if (cm_id->state != IB_CM_ESTABLISHED ||
2567             (cm_id->lap_state != IB_CM_LAP_RCVD &&
2568              cm_id->lap_state != IB_CM_MRA_LAP_SENT)) {
2569                 ret = -EINVAL;
2570                 goto out;
2571         }
2572
2573         ret = cm_alloc_msg(cm_id_priv, &msg);
2574         if (ret)
2575                 goto out;
2576
2577         cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status,
2578                       info, info_length, private_data, private_data_len);
2579         ret = ib_post_send_mad(msg, NULL);
2580         if (ret) {
2581                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2582                 cm_free_msg(msg);
2583                 return ret;
2584         }
2585
2586         cm_id->lap_state = IB_CM_LAP_IDLE;
2587 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2588         return ret;
2589 }
2590 EXPORT_SYMBOL(ib_send_cm_apr);
2591
2592 static int cm_apr_handler(struct cm_work *work)
2593 {
2594         struct cm_id_private *cm_id_priv;
2595         struct cm_apr_msg *apr_msg;
2596         unsigned long flags;
2597         int ret;
2598
2599         apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
2600         cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id,
2601                                    apr_msg->local_comm_id);
2602         if (!cm_id_priv)
2603                 return -EINVAL; /* Unmatched reply. */
2604
2605         work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status;
2606         work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info;
2607         work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length;
2608         work->cm_event.private_data = &apr_msg->private_data;
2609
2610         spin_lock_irqsave(&cm_id_priv->lock, flags);
2611         if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
2612             (cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
2613              cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
2614                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2615                 goto out;
2616         }
2617         cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
2618         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2619         cm_id_priv->msg = NULL;
2620
2621         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2622         if (!ret)
2623                 list_add_tail(&work->list, &cm_id_priv->work_list);
2624         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2625
2626         if (ret)
2627                 cm_process_work(cm_id_priv, work);
2628         else
2629                 cm_deref_id(cm_id_priv);
2630         return 0;
2631 out:
2632         cm_deref_id(cm_id_priv);
2633         return -EINVAL;
2634 }
2635
2636 static int cm_timewait_handler(struct cm_work *work)
2637 {
2638         struct cm_timewait_info *timewait_info;
2639         struct cm_id_private *cm_id_priv;
2640         int ret;
2641
2642         timewait_info = (struct cm_timewait_info *)work;
2643         spin_lock_irq(&cm.lock);
2644         list_del(&timewait_info->list);
2645         spin_unlock_irq(&cm.lock);
2646
2647         cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
2648                                    timewait_info->work.remote_id);
2649         if (!cm_id_priv)
2650                 return -EINVAL;
2651
2652         spin_lock_irq(&cm_id_priv->lock);
2653         if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
2654             cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
2655                 spin_unlock_irq(&cm_id_priv->lock);
2656                 goto out;
2657         }
2658         cm_id_priv->id.state = IB_CM_IDLE;
2659         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2660         if (!ret)
2661                 list_add_tail(&work->list, &cm_id_priv->work_list);
2662         spin_unlock_irq(&cm_id_priv->lock);
2663
2664         if (ret)
2665                 cm_process_work(cm_id_priv, work);
2666         else
2667                 cm_deref_id(cm_id_priv);
2668         return 0;
2669 out:
2670         cm_deref_id(cm_id_priv);
2671         return -EINVAL;
2672 }
2673
2674 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
2675                                struct cm_id_private *cm_id_priv,
2676                                struct ib_cm_sidr_req_param *param)
2677 {
2678         cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
2679                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR));
2680         sidr_req_msg->request_id = cm_id_priv->id.local_id;
2681         sidr_req_msg->pkey = cpu_to_be16(param->path->pkey);
2682         sidr_req_msg->service_id = param->service_id;
2683
2684         if (param->private_data && param->private_data_len)
2685                 memcpy(sidr_req_msg->private_data, param->private_data,
2686                        param->private_data_len);
2687 }
2688
2689 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
2690                         struct ib_cm_sidr_req_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->path || (param->private_data &&
2698              param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
2699                 return -EINVAL;
2700
2701         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2702         ret = cm_init_av_by_path(param->path, &cm_id_priv->av);
2703         if (ret)
2704                 goto out;
2705
2706         cm_id->service_id = param->service_id;
2707         cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
2708         cm_id_priv->timeout_ms = param->timeout_ms;
2709         cm_id_priv->max_cm_retries = param->max_cm_retries;
2710         ret = cm_alloc_msg(cm_id_priv, &msg);
2711         if (ret)
2712                 goto out;
2713
2714         cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv,
2715                            param);
2716         msg->timeout_ms = cm_id_priv->timeout_ms;
2717         msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT;
2718
2719         spin_lock_irqsave(&cm_id_priv->lock, flags);
2720         if (cm_id->state == IB_CM_IDLE)
2721                 ret = ib_post_send_mad(msg, NULL);
2722         else
2723                 ret = -EINVAL;
2724
2725         if (ret) {
2726                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2727                 cm_free_msg(msg);
2728                 goto out;
2729         }
2730         cm_id->state = IB_CM_SIDR_REQ_SENT;
2731         cm_id_priv->msg = msg;
2732         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2733 out:
2734         return ret;
2735 }
2736 EXPORT_SYMBOL(ib_send_cm_sidr_req);
2737
2738 static void cm_format_sidr_req_event(struct cm_work *work,
2739                                      struct ib_cm_id *listen_id)
2740 {
2741         struct cm_sidr_req_msg *sidr_req_msg;
2742         struct ib_cm_sidr_req_event_param *param;
2743
2744         sidr_req_msg = (struct cm_sidr_req_msg *)
2745                                 work->mad_recv_wc->recv_buf.mad;
2746         param = &work->cm_event.param.sidr_req_rcvd;
2747         param->pkey = __be16_to_cpu(sidr_req_msg->pkey);
2748         param->listen_id = listen_id;
2749         param->port = work->port->port_num;
2750         work->cm_event.private_data = &sidr_req_msg->private_data;
2751 }
2752
2753 static int cm_sidr_req_handler(struct cm_work *work)
2754 {
2755         struct ib_cm_id *cm_id;
2756         struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
2757         struct cm_sidr_req_msg *sidr_req_msg;
2758         struct ib_wc *wc;
2759         unsigned long flags;
2760
2761         cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL);
2762         if (IS_ERR(cm_id))
2763                 return PTR_ERR(cm_id);
2764         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2765
2766         /* Record SGID/SLID and request ID for lookup. */
2767         sidr_req_msg = (struct cm_sidr_req_msg *)
2768                                 work->mad_recv_wc->recv_buf.mad;
2769         wc = work->mad_recv_wc->wc;
2770         cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid);
2771         cm_id_priv->av.dgid.global.interface_id = 0;
2772         cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2773                                 work->mad_recv_wc->recv_buf.grh,
2774                                 &cm_id_priv->av);
2775         cm_id_priv->id.remote_id = sidr_req_msg->request_id;
2776         cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
2777         cm_id_priv->tid = sidr_req_msg->hdr.tid;
2778         atomic_inc(&cm_id_priv->work_count);
2779
2780         spin_lock_irqsave(&cm.lock, flags);
2781         cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
2782         if (cur_cm_id_priv) {
2783                 spin_unlock_irqrestore(&cm.lock, flags);
2784                 goto out; /* Duplicate message. */
2785         }
2786         cur_cm_id_priv = cm_find_listen(cm_id->device,
2787                                         sidr_req_msg->service_id,
2788                                         sidr_req_msg->private_data);
2789         if (!cur_cm_id_priv) {
2790                 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
2791                 spin_unlock_irqrestore(&cm.lock, flags);
2792                 /* todo: reply with no match */
2793                 goto out; /* No match. */
2794         }
2795         atomic_inc(&cur_cm_id_priv->refcount);
2796         spin_unlock_irqrestore(&cm.lock, flags);
2797
2798         cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler;
2799         cm_id_priv->id.context = cur_cm_id_priv->id.context;
2800         cm_id_priv->id.service_id = sidr_req_msg->service_id;
2801         cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL);
2802
2803         cm_format_sidr_req_event(work, &cur_cm_id_priv->id);
2804         cm_process_work(cm_id_priv, work);
2805         cm_deref_id(cur_cm_id_priv);
2806         return 0;
2807 out:
2808         ib_destroy_cm_id(&cm_id_priv->id);
2809         return -EINVAL;
2810 }
2811
2812 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
2813                                struct cm_id_private *cm_id_priv,
2814                                struct ib_cm_sidr_rep_param *param)
2815 {
2816         cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
2817                           cm_id_priv->tid);
2818         sidr_rep_msg->request_id = cm_id_priv->id.remote_id;
2819         sidr_rep_msg->status = param->status;
2820         cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num));
2821         sidr_rep_msg->service_id = cm_id_priv->id.service_id;
2822         sidr_rep_msg->qkey = cpu_to_be32(param->qkey);
2823
2824         if (param->info && param->info_length)
2825                 memcpy(sidr_rep_msg->info, param->info, param->info_length);
2826
2827         if (param->private_data && param->private_data_len)
2828                 memcpy(sidr_rep_msg->private_data, param->private_data,
2829                        param->private_data_len);
2830 }
2831
2832 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
2833                         struct ib_cm_sidr_rep_param *param)
2834 {
2835         struct cm_id_private *cm_id_priv;
2836         struct ib_mad_send_buf *msg;
2837         unsigned long flags;
2838         int ret;
2839
2840         if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
2841             (param->private_data &&
2842              param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE))
2843                 return -EINVAL;
2844
2845         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2846         spin_lock_irqsave(&cm_id_priv->lock, flags);
2847         if (cm_id->state != IB_CM_SIDR_REQ_RCVD) {
2848                 ret = -EINVAL;
2849                 goto error;
2850         }
2851
2852         ret = cm_alloc_msg(cm_id_priv, &msg);
2853         if (ret)
2854                 goto error;
2855
2856         cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
2857                            param);
2858         ret = ib_post_send_mad(msg, NULL);
2859         if (ret) {
2860                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2861                 cm_free_msg(msg);
2862                 return ret;
2863         }
2864         cm_id->state = IB_CM_IDLE;
2865         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2866
2867         spin_lock_irqsave(&cm.lock, flags);
2868         rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
2869         spin_unlock_irqrestore(&cm.lock, flags);
2870         return 0;
2871
2872 error:  spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2873         return ret;
2874 }
2875 EXPORT_SYMBOL(ib_send_cm_sidr_rep);
2876
2877 static void cm_format_sidr_rep_event(struct cm_work *work)
2878 {
2879         struct cm_sidr_rep_msg *sidr_rep_msg;
2880         struct ib_cm_sidr_rep_event_param *param;
2881
2882         sidr_rep_msg = (struct cm_sidr_rep_msg *)
2883                                 work->mad_recv_wc->recv_buf.mad;
2884         param = &work->cm_event.param.sidr_rep_rcvd;
2885         param->status = sidr_rep_msg->status;
2886         param->qkey = be32_to_cpu(sidr_rep_msg->qkey);
2887         param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg));
2888         param->info = &sidr_rep_msg->info;
2889         param->info_len = sidr_rep_msg->info_length;
2890         work->cm_event.private_data = &sidr_rep_msg->private_data;
2891 }
2892
2893 static int cm_sidr_rep_handler(struct cm_work *work)
2894 {
2895         struct cm_sidr_rep_msg *sidr_rep_msg;
2896         struct cm_id_private *cm_id_priv;
2897         unsigned long flags;
2898
2899         sidr_rep_msg = (struct cm_sidr_rep_msg *)
2900                                 work->mad_recv_wc->recv_buf.mad;
2901         cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0);
2902         if (!cm_id_priv)
2903                 return -EINVAL; /* Unmatched reply. */
2904
2905         spin_lock_irqsave(&cm_id_priv->lock, flags);
2906         if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
2907                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2908                 goto out;
2909         }
2910         cm_id_priv->id.state = IB_CM_IDLE;
2911         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2912         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2913
2914         cm_format_sidr_rep_event(work);
2915         cm_process_work(cm_id_priv, work);
2916         return 0;
2917 out:
2918         cm_deref_id(cm_id_priv);
2919         return -EINVAL;
2920 }
2921
2922 static void cm_process_send_error(struct ib_mad_send_buf *msg,
2923                                   enum ib_wc_status wc_status)
2924 {
2925         struct cm_id_private *cm_id_priv;
2926         struct ib_cm_event cm_event;
2927         enum ib_cm_state state;
2928         unsigned long flags;
2929         int ret;
2930
2931         memset(&cm_event, 0, sizeof cm_event);
2932         cm_id_priv = msg->context[0];
2933
2934         /* Discard old sends or ones without a response. */
2935         spin_lock_irqsave(&cm_id_priv->lock, flags);
2936         state = (enum ib_cm_state) (unsigned long) msg->context[1];
2937         if (msg != cm_id_priv->msg || state != cm_id_priv->id.state)
2938                 goto discard;
2939
2940         switch (state) {
2941         case IB_CM_REQ_SENT:
2942         case IB_CM_MRA_REQ_RCVD:
2943                 cm_reset_to_idle(cm_id_priv);
2944                 cm_event.event = IB_CM_REQ_ERROR;
2945                 break;
2946         case IB_CM_REP_SENT:
2947         case IB_CM_MRA_REP_RCVD:
2948                 cm_reset_to_idle(cm_id_priv);
2949                 cm_event.event = IB_CM_REP_ERROR;
2950                 break;
2951         case IB_CM_DREQ_SENT:
2952                 cm_enter_timewait(cm_id_priv);
2953                 cm_event.event = IB_CM_DREQ_ERROR;
2954                 break;
2955         case IB_CM_SIDR_REQ_SENT:
2956                 cm_id_priv->id.state = IB_CM_IDLE;
2957                 cm_event.event = IB_CM_SIDR_REQ_ERROR;
2958                 break;
2959         default:
2960                 goto discard;
2961         }
2962         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2963         cm_event.param.send_status = wc_status;
2964
2965         /* No other events can occur on the cm_id at this point. */
2966         ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
2967         cm_free_msg(msg);
2968         if (ret)
2969                 ib_destroy_cm_id(&cm_id_priv->id);
2970         return;
2971 discard:
2972         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2973         cm_free_msg(msg);
2974 }
2975
2976 static void cm_send_handler(struct ib_mad_agent *mad_agent,
2977                             struct ib_mad_send_wc *mad_send_wc)
2978 {
2979         struct ib_mad_send_buf *msg = mad_send_wc->send_buf;
2980
2981         switch (mad_send_wc->status) {
2982         case IB_WC_SUCCESS:
2983         case IB_WC_WR_FLUSH_ERR:
2984                 cm_free_msg(msg);
2985                 break;
2986         default:
2987                 if (msg->context[0] && msg->context[1])
2988                         cm_process_send_error(msg, mad_send_wc->status);
2989                 else
2990                         cm_free_msg(msg);
2991                 break;
2992         }
2993 }
2994
2995 static void cm_work_handler(struct work_struct *_work)
2996 {
2997         struct cm_work *work = container_of(_work, struct cm_work, work.work);
2998         int ret;
2999
3000         switch (work->cm_event.event) {
3001         case IB_CM_REQ_RECEIVED:
3002                 ret = cm_req_handler(work);
3003                 break;
3004         case IB_CM_MRA_RECEIVED:
3005                 ret = cm_mra_handler(work);
3006                 break;
3007         case IB_CM_REJ_RECEIVED:
3008                 ret = cm_rej_handler(work);
3009                 break;
3010         case IB_CM_REP_RECEIVED:
3011                 ret = cm_rep_handler(work);
3012                 break;
3013         case IB_CM_RTU_RECEIVED:
3014                 ret = cm_rtu_handler(work);
3015                 break;
3016         case IB_CM_USER_ESTABLISHED:
3017                 ret = cm_establish_handler(work);
3018                 break;
3019         case IB_CM_DREQ_RECEIVED:
3020                 ret = cm_dreq_handler(work);
3021                 break;
3022         case IB_CM_DREP_RECEIVED:
3023                 ret = cm_drep_handler(work);
3024                 break;
3025         case IB_CM_SIDR_REQ_RECEIVED:
3026                 ret = cm_sidr_req_handler(work);
3027                 break;
3028         case IB_CM_SIDR_REP_RECEIVED:
3029                 ret = cm_sidr_rep_handler(work);
3030                 break;
3031         case IB_CM_LAP_RECEIVED:
3032                 ret = cm_lap_handler(work);
3033                 break;
3034         case IB_CM_APR_RECEIVED:
3035                 ret = cm_apr_handler(work);
3036                 break;
3037         case IB_CM_TIMEWAIT_EXIT:
3038                 ret = cm_timewait_handler(work);
3039                 break;
3040         default:
3041                 ret = -EINVAL;
3042                 break;
3043         }
3044         if (ret)
3045                 cm_free_work(work);
3046 }
3047
3048 static int cm_establish(struct ib_cm_id *cm_id)
3049 {
3050         struct cm_id_private *cm_id_priv;
3051         struct cm_work *work;
3052         unsigned long flags;
3053         int ret = 0;
3054
3055         work = kmalloc(sizeof *work, GFP_ATOMIC);
3056         if (!work)
3057                 return -ENOMEM;
3058
3059         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3060         spin_lock_irqsave(&cm_id_priv->lock, flags);
3061         switch (cm_id->state)
3062         {
3063         case IB_CM_REP_SENT:
3064         case IB_CM_MRA_REP_RCVD:
3065                 cm_id->state = IB_CM_ESTABLISHED;
3066                 break;
3067         case IB_CM_ESTABLISHED:
3068                 ret = -EISCONN;
3069                 break;
3070         default:
3071                 ret = -EINVAL;
3072                 break;
3073         }
3074         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3075
3076         if (ret) {
3077                 kfree(work);
3078                 goto out;
3079         }
3080
3081         /*
3082          * The CM worker thread may try to destroy the cm_id before it
3083          * can execute this work item.  To prevent potential deadlock,
3084          * we need to find the cm_id once we're in the context of the
3085          * worker thread, rather than holding a reference on it.
3086          */
3087         INIT_DELAYED_WORK(&work->work, cm_work_handler);
3088         work->local_id = cm_id->local_id;
3089         work->remote_id = cm_id->remote_id;
3090         work->mad_recv_wc = NULL;
3091         work->cm_event.event = IB_CM_USER_ESTABLISHED;
3092         queue_delayed_work(cm.wq, &work->work, 0);
3093 out:
3094         return ret;
3095 }
3096
3097 static int cm_migrate(struct ib_cm_id *cm_id)
3098 {
3099         struct cm_id_private *cm_id_priv;
3100         unsigned long flags;
3101         int ret = 0;
3102
3103         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3104         spin_lock_irqsave(&cm_id_priv->lock, flags);
3105         if (cm_id->state == IB_CM_ESTABLISHED &&
3106             (cm_id->lap_state == IB_CM_LAP_UNINIT ||
3107              cm_id->lap_state == IB_CM_LAP_IDLE)) {
3108                 cm_id->lap_state = IB_CM_LAP_IDLE;
3109                 cm_id_priv->av = cm_id_priv->alt_av;
3110         } else
3111                 ret = -EINVAL;
3112         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3113
3114         return ret;
3115 }
3116
3117 int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event)
3118 {
3119         int ret;
3120
3121         switch (event) {
3122         case IB_EVENT_COMM_EST:
3123                 ret = cm_establish(cm_id);
3124                 break;
3125         case IB_EVENT_PATH_MIG:
3126                 ret = cm_migrate(cm_id);
3127                 break;
3128         default:
3129                 ret = -EINVAL;
3130         }
3131         return ret;
3132 }
3133 EXPORT_SYMBOL(ib_cm_notify);
3134
3135 static void cm_recv_handler(struct ib_mad_agent *mad_agent,
3136                             struct ib_mad_recv_wc *mad_recv_wc)
3137 {
3138         struct cm_work *work;
3139         enum ib_cm_event_type event;
3140         int paths = 0;
3141
3142         switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
3143         case CM_REQ_ATTR_ID:
3144                 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)->
3145                                                     alt_local_lid != 0);
3146                 event = IB_CM_REQ_RECEIVED;
3147                 break;
3148         case CM_MRA_ATTR_ID:
3149                 event = IB_CM_MRA_RECEIVED;
3150                 break;
3151         case CM_REJ_ATTR_ID:
3152                 event = IB_CM_REJ_RECEIVED;
3153                 break;
3154         case CM_REP_ATTR_ID:
3155                 event = IB_CM_REP_RECEIVED;
3156                 break;
3157         case CM_RTU_ATTR_ID:
3158                 event = IB_CM_RTU_RECEIVED;
3159                 break;
3160         case CM_DREQ_ATTR_ID:
3161                 event = IB_CM_DREQ_RECEIVED;
3162                 break;
3163         case CM_DREP_ATTR_ID:
3164                 event = IB_CM_DREP_RECEIVED;
3165                 break;
3166         case CM_SIDR_REQ_ATTR_ID:
3167                 event = IB_CM_SIDR_REQ_RECEIVED;
3168                 break;
3169         case CM_SIDR_REP_ATTR_ID:
3170                 event = IB_CM_SIDR_REP_RECEIVED;
3171                 break;
3172         case CM_LAP_ATTR_ID:
3173                 paths = 1;
3174                 event = IB_CM_LAP_RECEIVED;
3175                 break;
3176         case CM_APR_ATTR_ID:
3177                 event = IB_CM_APR_RECEIVED;
3178                 break;
3179         default:
3180                 ib_free_recv_mad(mad_recv_wc);
3181                 return;
3182         }
3183
3184         work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths,
3185                        GFP_KERNEL);
3186         if (!work) {
3187                 ib_free_recv_mad(mad_recv_wc);
3188                 return;
3189         }
3190
3191         INIT_DELAYED_WORK(&work->work, cm_work_handler);
3192         work->cm_event.event = event;
3193         work->mad_recv_wc = mad_recv_wc;
3194         work->port = (struct cm_port *)mad_agent->context;
3195         queue_delayed_work(cm.wq, &work->work, 0);
3196 }
3197
3198 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
3199                                 struct ib_qp_attr *qp_attr,
3200                                 int *qp_attr_mask)
3201 {
3202         unsigned long flags;
3203         int ret;
3204
3205         spin_lock_irqsave(&cm_id_priv->lock, flags);
3206         switch (cm_id_priv->id.state) {
3207         case IB_CM_REQ_SENT:
3208         case IB_CM_MRA_REQ_RCVD:
3209         case IB_CM_REQ_RCVD:
3210         case IB_CM_MRA_REQ_SENT:
3211         case IB_CM_REP_RCVD:
3212         case IB_CM_MRA_REP_SENT:
3213         case IB_CM_REP_SENT:
3214         case IB_CM_MRA_REP_RCVD:
3215         case IB_CM_ESTABLISHED:
3216                 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
3217                                 IB_QP_PKEY_INDEX | IB_QP_PORT;
3218                 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE;
3219                 if (cm_id_priv->responder_resources)
3220                         qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ |
3221                                                     IB_ACCESS_REMOTE_ATOMIC;
3222                 qp_attr->pkey_index = cm_id_priv->av.pkey_index;
3223                 qp_attr->port_num = cm_id_priv->av.port->port_num;
3224                 ret = 0;
3225                 break;
3226         default:
3227                 ret = -EINVAL;
3228                 break;
3229         }
3230         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3231         return ret;
3232 }
3233
3234 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
3235                                struct ib_qp_attr *qp_attr,
3236                                int *qp_attr_mask)
3237 {
3238         unsigned long flags;
3239         int ret;
3240
3241         spin_lock_irqsave(&cm_id_priv->lock, flags);
3242         switch (cm_id_priv->id.state) {
3243         case IB_CM_REQ_RCVD:
3244         case IB_CM_MRA_REQ_SENT:
3245         case IB_CM_REP_RCVD:
3246         case IB_CM_MRA_REP_SENT:
3247         case IB_CM_REP_SENT:
3248         case IB_CM_MRA_REP_RCVD:
3249         case IB_CM_ESTABLISHED:
3250                 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
3251                                 IB_QP_DEST_QPN | IB_QP_RQ_PSN;
3252                 qp_attr->ah_attr = cm_id_priv->av.ah_attr;
3253                 qp_attr->path_mtu = cm_id_priv->path_mtu;
3254                 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
3255                 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
3256                 if (cm_id_priv->qp_type == IB_QPT_RC) {
3257                         *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC |
3258                                          IB_QP_MIN_RNR_TIMER;
3259                         qp_attr->max_dest_rd_atomic =
3260                                         cm_id_priv->responder_resources;
3261                         qp_attr->min_rnr_timer = 0;
3262                 }
3263                 if (cm_id_priv->alt_av.ah_attr.dlid) {
3264                         *qp_attr_mask |= IB_QP_ALT_PATH;
3265                         qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
3266                         qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
3267                         qp_attr->alt_timeout =
3268                                         cm_id_priv->alt_av.packet_life_time + 1;
3269                         qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3270                 }
3271                 ret = 0;
3272                 break;
3273         default:
3274                 ret = -EINVAL;
3275                 break;
3276         }
3277         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3278         return ret;
3279 }
3280
3281 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv,
3282                                struct ib_qp_attr *qp_attr,
3283                                int *qp_attr_mask)
3284 {
3285         unsigned long flags;
3286         int ret;
3287
3288         spin_lock_irqsave(&cm_id_priv->lock, flags);
3289         switch (cm_id_priv->id.state) {
3290         /* Allow transition to RTS before sending REP */
3291         case IB_CM_REQ_RCVD:
3292         case IB_CM_MRA_REQ_SENT:
3293
3294         case IB_CM_REP_RCVD:
3295         case IB_CM_MRA_REP_SENT:
3296         case IB_CM_REP_SENT:
3297         case IB_CM_MRA_REP_RCVD:
3298         case IB_CM_ESTABLISHED:
3299                 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) {
3300                         *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN;
3301                         qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn);
3302                         if (cm_id_priv->qp_type == IB_QPT_RC) {
3303                                 *qp_attr_mask |= IB_QP_TIMEOUT | IB_QP_RETRY_CNT |
3304                                                  IB_QP_RNR_RETRY |
3305                                                  IB_QP_MAX_QP_RD_ATOMIC;
3306                                 qp_attr->timeout =
3307                                         cm_id_priv->av.packet_life_time + 1;
3308                                 qp_attr->retry_cnt = cm_id_priv->retry_count;
3309                                 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count;
3310                                 qp_attr->max_rd_atomic =
3311                                         cm_id_priv->initiator_depth;
3312                         }
3313                         if (cm_id_priv->alt_av.ah_attr.dlid) {
3314                                 *qp_attr_mask |= IB_QP_PATH_MIG_STATE;
3315                                 qp_attr->path_mig_state = IB_MIG_REARM;
3316                         }
3317                 } else {
3318                         *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE;
3319                         qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
3320                         qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
3321                         qp_attr->alt_timeout =
3322                                 cm_id_priv->alt_av.packet_life_time + 1;
3323                         qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3324                         qp_attr->path_mig_state = IB_MIG_REARM;
3325                 }
3326                 ret = 0;
3327                 break;
3328         default:
3329                 ret = -EINVAL;
3330                 break;
3331         }
3332         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3333         return ret;
3334 }
3335
3336 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
3337                        struct ib_qp_attr *qp_attr,
3338                        int *qp_attr_mask)
3339 {
3340         struct cm_id_private *cm_id_priv;
3341         int ret;
3342
3343         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3344         switch (qp_attr->qp_state) {
3345         case IB_QPS_INIT:
3346                 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask);
3347                 break;
3348         case IB_QPS_RTR:
3349                 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask);
3350                 break;
3351         case IB_QPS_RTS:
3352                 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask);
3353                 break;
3354         default:
3355                 ret = -EINVAL;
3356                 break;
3357         }
3358         return ret;
3359 }
3360 EXPORT_SYMBOL(ib_cm_init_qp_attr);
3361
3362 static void cm_add_one(struct ib_device *device)
3363 {
3364         struct cm_device *cm_dev;
3365         struct cm_port *port;
3366         struct ib_mad_reg_req reg_req = {
3367                 .mgmt_class = IB_MGMT_CLASS_CM,
3368                 .mgmt_class_version = IB_CM_CLASS_VERSION
3369         };
3370         struct ib_port_modify port_modify = {
3371                 .set_port_cap_mask = IB_PORT_CM_SUP
3372         };
3373         unsigned long flags;
3374         int ret;
3375         u8 i;
3376
3377         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
3378                 return;
3379
3380         cm_dev = kmalloc(sizeof(*cm_dev) + sizeof(*port) *
3381                          device->phys_port_cnt, GFP_KERNEL);
3382         if (!cm_dev)
3383                 return;
3384
3385         cm_dev->device = device;
3386
3387         set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
3388         for (i = 1; i <= device->phys_port_cnt; i++) {
3389                 port = &cm_dev->port[i-1];
3390                 port->cm_dev = cm_dev;
3391                 port->port_num = i;
3392                 port->mad_agent = ib_register_mad_agent(device, i,
3393                                                         IB_QPT_GSI,
3394                                                         &reg_req,
3395                                                         0,
3396                                                         cm_send_handler,
3397                                                         cm_recv_handler,
3398                                                         port);
3399                 if (IS_ERR(port->mad_agent))
3400                         goto error1;
3401
3402                 ret = ib_modify_port(device, i, 0, &port_modify);
3403                 if (ret)
3404                         goto error2;
3405         }
3406         ib_set_client_data(device, &cm_client, cm_dev);
3407
3408         write_lock_irqsave(&cm.device_lock, flags);
3409         list_add_tail(&cm_dev->list, &cm.device_list);
3410         write_unlock_irqrestore(&cm.device_lock, flags);
3411         return;
3412
3413 error2:
3414         ib_unregister_mad_agent(port->mad_agent);
3415 error1:
3416         port_modify.set_port_cap_mask = 0;
3417         port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
3418         while (--i) {
3419                 port = &cm_dev->port[i-1];
3420                 ib_modify_port(device, port->port_num, 0, &port_modify);
3421                 ib_unregister_mad_agent(port->mad_agent);
3422         }
3423         kfree(cm_dev);
3424 }
3425
3426 static void cm_remove_one(struct ib_device *device)
3427 {
3428         struct cm_device *cm_dev;
3429         struct cm_port *port;
3430         struct ib_port_modify port_modify = {
3431                 .clr_port_cap_mask = IB_PORT_CM_SUP
3432         };
3433         unsigned long flags;
3434         int i;
3435
3436         cm_dev = ib_get_client_data(device, &cm_client);
3437         if (!cm_dev)
3438                 return;
3439
3440         write_lock_irqsave(&cm.device_lock, flags);
3441         list_del(&cm_dev->list);
3442         write_unlock_irqrestore(&cm.device_lock, flags);
3443
3444         for (i = 1; i <= device->phys_port_cnt; i++) {
3445                 port = &cm_dev->port[i-1];
3446                 ib_modify_port(device, port->port_num, 0, &port_modify);
3447                 ib_unregister_mad_agent(port->mad_agent);
3448         }
3449         kfree(cm_dev);
3450 }
3451
3452 static int __init ib_cm_init(void)
3453 {
3454         int ret;
3455
3456         memset(&cm, 0, sizeof cm);
3457         INIT_LIST_HEAD(&cm.device_list);
3458         rwlock_init(&cm.device_lock);
3459         spin_lock_init(&cm.lock);
3460         cm.listen_service_table = RB_ROOT;
3461         cm.listen_service_id = __constant_be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID);
3462         cm.remote_id_table = RB_ROOT;
3463         cm.remote_qp_table = RB_ROOT;
3464         cm.remote_sidr_table = RB_ROOT;
3465         idr_init(&cm.local_id_table);
3466         get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand);
3467         idr_pre_get(&cm.local_id_table, GFP_KERNEL);
3468         INIT_LIST_HEAD(&cm.timewait_list);
3469
3470         cm.wq = create_workqueue("ib_cm");
3471         if (!cm.wq)
3472                 return -ENOMEM;
3473
3474         ret = ib_register_client(&cm_client);
3475         if (ret)
3476                 goto error;
3477
3478         return 0;
3479 error:
3480         destroy_workqueue(cm.wq);
3481         return ret;
3482 }
3483
3484 static void __exit ib_cm_cleanup(void)
3485 {
3486         struct cm_timewait_info *timewait_info, *tmp;
3487
3488         spin_lock_irq(&cm.lock);
3489         list_for_each_entry(timewait_info, &cm.timewait_list, list)
3490                 cancel_delayed_work(&timewait_info->work.work);
3491         spin_unlock_irq(&cm.lock);
3492
3493         destroy_workqueue(cm.wq);
3494
3495         list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) {
3496                 list_del(&timewait_info->list);
3497                 kfree(timewait_info);
3498         }
3499
3500         ib_unregister_client(&cm_client);
3501         idr_destroy(&cm.local_id_table);
3502 }
3503
3504 module_init(ib_cm_init);
3505 module_exit(ib_cm_cleanup);
3506