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/pci.h>
  44 #include <linux/random.h>
  45 #include <linux/rbtree.h>
  46 #include <linux/spinlock.h>
  47 #include <linux/workqueue.h>
  48
  49 #include <rdma/ib_cache.h>
  50 #include <rdma/ib_cm.h>
  51 #include "cm_msgs.h"
  52
  53 MODULE_AUTHOR("Sean Hefty");
  54 MODULE_DESCRIPTION("InfiniBand CM");
  55 MODULE_LICENSE("Dual BSD/GPL");
  56
  57 static void cm_add_one(struct ib_device *device);
  58 static void cm_remove_one(struct ib_device *device);
  59
  60 static struct ib_client cm_client = {
  61         .name   = "cm",
  62         .add    = cm_add_one,
  63         .remove = cm_remove_one
  64 };
  65
  66 static struct ib_cm {
  67         spinlock_t lock;
  68         struct list_head device_list;
  69         rwlock_t device_lock;
  70         struct rb_root listen_service_table;
  71         u64 listen_service_id;
  72         /* struct rb_root peer_service_table; todo: fix peer to peer */
  73         struct rb_root remote_qp_table;
  74         struct rb_root remote_id_table;
  75         struct rb_root remote_sidr_table;
  76         struct idr local_id_table;
  77         __be32 random_id_operand;
  78         struct list_head timewait_list;
  79         struct workqueue_struct *wq;
  80 } cm;
  81
  82 struct cm_port {
  83         struct cm_device *cm_dev;
  84         struct ib_mad_agent *mad_agent;
  85         u8 port_num;
  86 };
  87
  88 struct cm_device {
  89         struct list_head list;
  90         struct ib_device *device;
  91         __be64 ca_guid;
  92         struct cm_port port[0];
  93 };
  94
  95 struct cm_av {
  96         struct cm_port *port;
  97         union ib_gid dgid;
  98         struct ib_ah_attr ah_attr;
  99         u16 pkey_index;
 100         u8 packet_life_time;
 101 };
 102
 103 struct cm_work {
 104         struct work_struct work;
 105         struct list_head list;
 106         struct cm_port *port;
 107         struct ib_mad_recv_wc *mad_recv_wc;     /* Received MADs */
 108         __be32 local_id;                        /* Established / timewait */
 109         __be32 remote_id;
 110         struct ib_cm_event cm_event;
 111         struct ib_sa_path_rec path[0];
 112 };
 113
 114 struct cm_timewait_info {
 115         struct cm_work work;                    /* Must be first. */
 116         struct list_head list;
 117         struct rb_node remote_qp_node;
 118         struct rb_node remote_id_node;
 119         __be64 remote_ca_guid;
 120         __be32 remote_qpn;
 121         u8 inserted_remote_qp;
 122         u8 inserted_remote_id;
 123 };
 124
 125 struct cm_id_private {
 126         struct ib_cm_id id;
 127
 128         struct rb_node service_node;
 129         struct rb_node sidr_id_node;
 130         spinlock_t lock;        /* Do not acquire inside cm.lock */
 131         struct completion comp;
 132         atomic_t refcount;
 133
 134         struct ib_mad_send_buf *msg;
 135         struct cm_timewait_info *timewait_info;
 136         /* todo: use alternate port on send failure */
 137         struct cm_av av;
 138         struct cm_av alt_av;
 139         struct ib_cm_compare_data *compare_data;
 140
 141         void *private_data;
 142         __be64 tid;
 143         __be32 local_qpn;
 144         __be32 remote_qpn;
 145         enum ib_qp_type qp_type;
 146         __be32 sq_psn;
 147         __be32 rq_psn;
 148         int timeout_ms;
 149         enum ib_mtu path_mtu;
 150         u8 private_data_len;
 151         u8 max_cm_retries;
 152         u8 peer_to_peer;
 153         u8 responder_resources;
 154         u8 initiator_depth;
 155         u8 local_ack_timeout;
 156         u8 retry_count;
 157         u8 rnr_retry_count;
 158         u8 service_timeout;
 159
 160         struct list_head work_list;
 161         atomic_t work_count;
 162 };
 163
 164 static void cm_work_handler(void *data);
 165
 166 static inline void cm_deref_id(struct cm_id_private *cm_id_priv)
 167 {
 168         if (atomic_dec_and_test(&cm_id_priv->refcount))
 169                 complete(&cm_id_priv->comp);
 170 }
 171
 172 static int cm_alloc_msg(struct cm_id_private *cm_id_priv,
 173                         struct ib_mad_send_buf **msg)
 174 {
 175         struct ib_mad_agent *mad_agent;
 176         struct ib_mad_send_buf *m;
 177         struct ib_ah *ah;
 178
 179         mad_agent = cm_id_priv->av.port->mad_agent;
 180         ah = ib_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr);
 181         if (IS_ERR(ah))
 182                 return PTR_ERR(ah);
 183
 184         m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn,
 185                                cm_id_priv->av.pkey_index,
 186                                0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
 187                                GFP_ATOMIC);
 188         if (IS_ERR(m)) {
 189                 ib_destroy_ah(ah);
 190                 return PTR_ERR(m);
 191         }
 192
 193         /* Timeout set by caller if response is expected. */
 194         m->ah = ah;
 195         m->retries = cm_id_priv->max_cm_retries;
 196
 197         atomic_inc(&cm_id_priv->refcount);
 198         m->context[0] = cm_id_priv;
 199         *msg = m;
 200         return 0;
 201 }
 202
 203 static int cm_alloc_response_msg(struct cm_port *port,
 204                                  struct ib_mad_recv_wc *mad_recv_wc,
 205                                  struct ib_mad_send_buf **msg)
 206 {
 207         struct ib_mad_send_buf *m;
 208         struct ib_ah *ah;
 209
 210         ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc,
 211                                   mad_recv_wc->recv_buf.grh, port->port_num);
 212         if (IS_ERR(ah))
 213                 return PTR_ERR(ah);
 214
 215         m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index,
 216                                0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
 217                                GFP_ATOMIC);
 218         if (IS_ERR(m)) {
 219                 ib_destroy_ah(ah);
 220                 return PTR_ERR(m);
 221         }
 222         m->ah = ah;
 223         *msg = m;
 224         return 0;
 225 }
 226
 227 static void cm_free_msg(struct ib_mad_send_buf *msg)
 228 {
 229         ib_destroy_ah(msg->ah);
 230         if (msg->context[0])
 231                 cm_deref_id(msg->context[0]);
 232         ib_free_send_mad(msg);
 233 }
 234
 235 static void * cm_copy_private_data(const void *private_data,
 236                                    u8 private_data_len)
 237 {
 238         void *data;
 239
 240         if (!private_data || !private_data_len)
 241                 return NULL;
 242
 243         data = kmemdup(private_data, private_data_len, GFP_KERNEL);
 244         if (!data)
 245                 return ERR_PTR(-ENOMEM);
 246
 247         return data;
 248 }
 249
 250 static void cm_set_private_data(struct cm_id_private *cm_id_priv,
 251                                  void *private_data, u8 private_data_len)
 252 {
 253         if (cm_id_priv->private_data && cm_id_priv->private_data_len)
 254                 kfree(cm_id_priv->private_data);
 255
 256         cm_id_priv->private_data = private_data;
 257         cm_id_priv->private_data_len = private_data_len;
 258 }
 259
 260 static void cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc,
 261                                     struct ib_grh *grh, struct cm_av *av)
 262 {
 263         av->port = port;
 264         av->pkey_index = wc->pkey_index;
 265         ib_init_ah_from_wc(port->cm_dev->device, port->port_num, wc,
 266                            grh, &av->ah_attr);
 267 }
 268
 269 static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av)
 270 {
 271         struct cm_device *cm_dev;
 272         struct cm_port *port = NULL;
 273         unsigned long flags;
 274         int ret;
 275         u8 p;
 276
 277         read_lock_irqsave(&cm.device_lock, flags);
 278         list_for_each_entry(cm_dev, &cm.device_list, list) {
 279                 if (!ib_find_cached_gid(cm_dev->device, &path->sgid,
 280                                         &p, NULL)) {
 281                         port = &cm_dev->port[p-1];
 282                         break;
 283                 }
 284         }
 285         read_unlock_irqrestore(&cm.device_lock, flags);
 286
 287         if (!port)
 288                 return -EINVAL;
 289
 290         ret = ib_find_cached_pkey(cm_dev->device, port->port_num,
 291                                   be16_to_cpu(path->pkey), &av->pkey_index);
 292         if (ret)
 293                 return ret;
 294
 295         av->port = port;
 296         ib_init_ah_from_path(cm_dev->device, port->port_num, path,
 297                              &av->ah_attr);
 298         av->packet_life_time = path->packet_life_time;
 299         return 0;
 300 }
 301
 302 static int cm_alloc_id(struct cm_id_private *cm_id_priv)
 303 {
 304         unsigned long flags;
 305         int ret, id;
 306         static int next_id;
 307
 308         do {
 309                 spin_lock_irqsave(&cm.lock, flags);
 310                 ret = idr_get_new_above(&cm.local_id_table, cm_id_priv,
 311                                         next_id++, &id);
 312                 spin_unlock_irqrestore(&cm.lock, flags);
 313         } while( (ret == -EAGAIN) && idr_pre_get(&cm.local_id_table, GFP_KERNEL) );
 314
 315         cm_id_priv->id.local_id = (__force __be32) (id ^ cm.random_id_operand);
 316         return ret;
 317 }
 318
 319 static void cm_free_id(__be32 local_id)
 320 {
 321         unsigned long flags;
 322
 323         spin_lock_irqsave(&cm.lock, flags);
 324         idr_remove(&cm.local_id_table,
 325                    (__force int) (local_id ^ cm.random_id_operand));
 326         spin_unlock_irqrestore(&cm.lock, flags);
 327 }
 328
 329 static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id)
 330 {
 331         struct cm_id_private *cm_id_priv;
 332
 333         cm_id_priv = idr_find(&cm.local_id_table,
 334                               (__force int) (local_id ^ cm.random_id_operand));
 335         if (cm_id_priv) {
 336                 if (cm_id_priv->id.remote_id == remote_id)
 337                         atomic_inc(&cm_id_priv->refcount);
 338                 else
 339                         cm_id_priv = NULL;
 340         }
 341
 342         return cm_id_priv;
 343 }
 344
 345 static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id)
 346 {
 347         struct cm_id_private *cm_id_priv;
 348         unsigned long flags;
 349
 350         spin_lock_irqsave(&cm.lock, flags);
 351         cm_id_priv = cm_get_id(local_id, remote_id);
 352         spin_unlock_irqrestore(&cm.lock, flags);
 353
 354         return cm_id_priv;
 355 }
 356
 357 static void cm_mask_copy(u8 *dst, u8 *src, u8 *mask)
 358 {
 359         int i;
 360
 361         for (i = 0; i < IB_CM_COMPARE_SIZE / sizeof(unsigned long); i++)
 362                 ((unsigned long *) dst)[i] = ((unsigned long *) src)[i] &
 363                                              ((unsigned long *) mask)[i];
 364 }
 365
 366 static int cm_compare_data(struct ib_cm_compare_data *src_data,
 367                            struct ib_cm_compare_data *dst_data)
 368 {
 369         u8 src[IB_CM_COMPARE_SIZE];
 370         u8 dst[IB_CM_COMPARE_SIZE];
 371
 372         if (!src_data || !dst_data)
 373                 return 0;
 374
 375         cm_mask_copy(src, src_data->data, dst_data->mask);
 376         cm_mask_copy(dst, dst_data->data, src_data->mask);
 377         return memcmp(src, dst, IB_CM_COMPARE_SIZE);
 378 }
 379
 380 static int cm_compare_private_data(u8 *private_data,
 381                                    struct ib_cm_compare_data *dst_data)
 382 {
 383         u8 src[IB_CM_COMPARE_SIZE];
 384
 385         if (!dst_data)
 386                 return 0;
 387
 388         cm_mask_copy(src, private_data, dst_data->mask);
 389         return memcmp(src, dst_data->data, IB_CM_COMPARE_SIZE);
 390 }
 391
 392 static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv)
 393 {
 394         struct rb_node **link = &cm.listen_service_table.rb_node;
 395         struct rb_node *parent = NULL;
 396         struct cm_id_private *cur_cm_id_priv;
 397         __be64 service_id = cm_id_priv->id.service_id;
 398         __be64 service_mask = cm_id_priv->id.service_mask;
 399         int data_cmp;
 400
 401         while (*link) {
 402                 parent = *link;
 403                 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
 404                                           service_node);
 405                 data_cmp = cm_compare_data(cm_id_priv->compare_data,
 406                                            cur_cm_id_priv->compare_data);
 407                 if ((cur_cm_id_priv->id.service_mask & service_id) ==
 408                     (service_mask & cur_cm_id_priv->id.service_id) &&
 409                     (cm_id_priv->id.device == cur_cm_id_priv->id.device) &&
 410                     !data_cmp)
 411                         return cur_cm_id_priv;
 412
 413                 if (cm_id_priv->id.device < cur_cm_id_priv->id.device)
 414                         link = &(*link)->rb_left;
 415                 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device)
 416                         link = &(*link)->rb_right;
 417                 else if (service_id < cur_cm_id_priv->id.service_id)
 418                         link = &(*link)->rb_left;
 419                 else if (service_id > cur_cm_id_priv->id.service_id)
 420                         link = &(*link)->rb_right;
 421                 else if (data_cmp < 0)
 422                         link = &(*link)->rb_left;
 423                 else
 424                         link = &(*link)->rb_right;
 425         }
 426         rb_link_node(&cm_id_priv->service_node, parent, link);
 427         rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table);
 428         return NULL;
 429 }
 430
 431 static struct cm_id_private * cm_find_listen(struct ib_device *device,
 432                                              __be64 service_id,
 433                                              u8 *private_data)
 434 {
 435         struct rb_node *node = cm.listen_service_table.rb_node;
 436         struct cm_id_private *cm_id_priv;
 437         int data_cmp;
 438
 439         while (node) {
 440                 cm_id_priv = rb_entry(node, struct cm_id_private, service_node);
 441                 data_cmp = cm_compare_private_data(private_data,
 442                                                    cm_id_priv->compare_data);
 443                 if ((cm_id_priv->id.service_mask & service_id) ==
 444                      cm_id_priv->id.service_id &&
 445                     (cm_id_priv->id.device == device) && !data_cmp)
 446                         return cm_id_priv;
 447
 448                 if (device < cm_id_priv->id.device)
 449                         node = node->rb_left;
 450                 else if (device > cm_id_priv->id.device)
 451                         node = node->rb_right;
 452                 else if (service_id < cm_id_priv->id.service_id)
 453                         node = node->rb_left;
 454                 else if (service_id > cm_id_priv->id.service_id)
 455                         node = node->rb_right;
 456                 else if (data_cmp < 0)
 457                         node = node->rb_left;
 458                 else
 459                         node = node->rb_right;
 460         }
 461         return NULL;
 462 }
 463
 464 static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info
 465                                                      *timewait_info)
 466 {
 467         struct rb_node **link = &cm.remote_id_table.rb_node;
 468         struct rb_node *parent = NULL;
 469         struct cm_timewait_info *cur_timewait_info;
 470         __be64 remote_ca_guid = timewait_info->remote_ca_guid;
 471         __be32 remote_id = timewait_info->work.remote_id;
 472
 473         while (*link) {
 474                 parent = *link;
 475                 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
 476                                              remote_id_node);
 477                 if (remote_id < cur_timewait_info->work.remote_id)
 478                         link = &(*link)->rb_left;
 479                 else if (remote_id > cur_timewait_info->work.remote_id)
 480                         link = &(*link)->rb_right;
 481                 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid)
 482                         link = &(*link)->rb_left;
 483                 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid)
 484                         link = &(*link)->rb_right;
 485                 else
 486                         return cur_timewait_info;
 487         }
 488         timewait_info->inserted_remote_id = 1;
 489         rb_link_node(&timewait_info->remote_id_node, parent, link);
 490         rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table);
 491         return NULL;
 492 }
 493
 494 static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid,
 495                                                    __be32 remote_id)
 496 {
 497         struct rb_node *node = cm.remote_id_table.rb_node;
 498         struct cm_timewait_info *timewait_info;
 499
 500         while (node) {
 501                 timewait_info = rb_entry(node, struct cm_timewait_info,
 502                                          remote_id_node);
 503                 if (remote_id < timewait_info->work.remote_id)
 504                         node = node->rb_left;
 505                 else if (remote_id > timewait_info->work.remote_id)
 506                         node = node->rb_right;
 507                 else if (remote_ca_guid < timewait_info->remote_ca_guid)
 508                         node = node->rb_left;
 509                 else if (remote_ca_guid > timewait_info->remote_ca_guid)
 510                         node = node->rb_right;
 511                 else
 512                         return timewait_info;
 513         }
 514         return NULL;
 515 }
 516
 517 static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info
 518                                                       *timewait_info)
 519 {
 520         struct rb_node **link = &cm.remote_qp_table.rb_node;
 521         struct rb_node *parent = NULL;
 522         struct cm_timewait_info *cur_timewait_info;
 523         __be64 remote_ca_guid = timewait_info->remote_ca_guid;
 524         __be32 remote_qpn = timewait_info->remote_qpn;
 525
 526         while (*link) {
 527                 parent = *link;
 528                 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
 529                                              remote_qp_node);
 530                 if (remote_qpn < cur_timewait_info->remote_qpn)
 531                         link = &(*link)->rb_left;
 532                 else if (remote_qpn > cur_timewait_info->remote_qpn)
 533                         link = &(*link)->rb_right;
 534                 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid)
 535                         link = &(*link)->rb_left;
 536                 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid)
 537                         link = &(*link)->rb_right;
 538                 else
 539                         return cur_timewait_info;
 540         }
 541         timewait_info->inserted_remote_qp = 1;
 542         rb_link_node(&timewait_info->remote_qp_node, parent, link);
 543         rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table);
 544         return NULL;
 545 }
 546
 547 static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private
 548                                                     *cm_id_priv)
 549 {
 550         struct rb_node **link = &cm.remote_sidr_table.rb_node;
 551         struct rb_node *parent = NULL;
 552         struct cm_id_private *cur_cm_id_priv;
 553         union ib_gid *port_gid = &cm_id_priv->av.dgid;
 554         __be32 remote_id = cm_id_priv->id.remote_id;
 555
 556         while (*link) {
 557                 parent = *link;
 558                 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
 559                                           sidr_id_node);
 560                 if (remote_id < cur_cm_id_priv->id.remote_id)
 561                         link = &(*link)->rb_left;
 562                 else if (remote_id > cur_cm_id_priv->id.remote_id)
 563                         link = &(*link)->rb_right;
 564                 else {
 565                         int cmp;
 566                         cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid,
 567                                      sizeof *port_gid);
 568                         if (cmp < 0)
 569                                 link = &(*link)->rb_left;
 570                         else if (cmp > 0)
 571                                 link = &(*link)->rb_right;
 572                         else
 573                                 return cur_cm_id_priv;
 574                 }
 575         }
 576         rb_link_node(&cm_id_priv->sidr_id_node, parent, link);
 577         rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
 578         return NULL;
 579 }
 580
 581 static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv,
 582                                enum ib_cm_sidr_status status)
 583 {
 584         struct ib_cm_sidr_rep_param param;
 585
 586         memset(&param, 0, sizeof param);
 587         param.status = status;
 588         ib_send_cm_sidr_rep(&cm_id_priv->id, &param);
 589 }
 590
 591 struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
 592                                  ib_cm_handler cm_handler,
 593                                  void *context)
 594 {
 595         struct cm_id_private *cm_id_priv;
 596         int ret;
 597
 598         cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL);
 599         if (!cm_id_priv)
 600                 return ERR_PTR(-ENOMEM);
 601
 602         cm_id_priv->id.state = IB_CM_IDLE;
 603         cm_id_priv->id.device = device;
 604         cm_id_priv->id.cm_handler = cm_handler;
 605         cm_id_priv->id.context = context;
 606         cm_id_priv->id.remote_cm_qpn = 1;
 607         ret = cm_alloc_id(cm_id_priv);
 608         if (ret)
 609                 goto error;
 610
 611         spin_lock_init(&cm_id_priv->lock);
 612         init_completion(&cm_id_priv->comp);
 613         INIT_LIST_HEAD(&cm_id_priv->work_list);
 614         atomic_set(&cm_id_priv->work_count, -1);
 615         atomic_set(&cm_id_priv->refcount, 1);
 616         return &cm_id_priv->id;
 617
 618 error:
 619         kfree(cm_id_priv);
 620         return ERR_PTR(-ENOMEM);
 621 }
 622 EXPORT_SYMBOL(ib_create_cm_id);
 623
 624 static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv)
 625 {
 626         struct cm_work *work;
 627
 628         if (list_empty(&cm_id_priv->work_list))
 629                 return NULL;
 630
 631         work = list_entry(cm_id_priv->work_list.next, struct cm_work, list);
 632         list_del(&work->list);
 633         return work;
 634 }
 635
 636 static void cm_free_work(struct cm_work *work)
 637 {
 638         if (work->mad_recv_wc)
 639                 ib_free_recv_mad(work->mad_recv_wc);
 640         kfree(work);
 641 }
 642
 643 static inline int cm_convert_to_ms(int iba_time)
 644 {
 645         /* approximate conversion to ms from 4.096us x 2^iba_time */
 646         return 1 << max(iba_time - 8, 0);
 647 }
 648
 649 static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info)
 650 {
 651         if (timewait_info->inserted_remote_id) {
 652                 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table);
 653                 timewait_info->inserted_remote_id = 0;
 654         }
 655
 656         if (timewait_info->inserted_remote_qp) {
 657                 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table);
 658                 timewait_info->inserted_remote_qp = 0;
 659         }
 660 }
 661
 662 static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id)
 663 {
 664         struct cm_timewait_info *timewait_info;
 665
 666         timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL);
 667         if (!timewait_info)
 668                 return ERR_PTR(-ENOMEM);
 669
 670         timewait_info->work.local_id = local_id;
 671         INIT_WORK(&timewait_info->work.work, cm_work_handler,
 672                   &timewait_info->work);
 673         timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT;
 674         return timewait_info;
 675 }
 676
 677 static void cm_enter_timewait(struct cm_id_private *cm_id_priv)
 678 {
 679         int wait_time;
 680         unsigned long flags;
 681
 682         spin_lock_irqsave(&cm.lock, flags);
 683         cm_cleanup_timewait(cm_id_priv->timewait_info);
 684         list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list);
 685         spin_unlock_irqrestore(&cm.lock, flags);
 686
 687         /*
 688          * The cm_id could be destroyed by the user before we exit timewait.
 689          * To protect against this, we search for the cm_id after exiting
 690          * timewait before notifying the user that we've exited timewait.
 691          */
 692         cm_id_priv->id.state = IB_CM_TIMEWAIT;
 693         wait_time = cm_convert_to_ms(cm_id_priv->local_ack_timeout);
 694         queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work,
 695                            msecs_to_jiffies(wait_time));
 696         cm_id_priv->timewait_info = NULL;
 697 }
 698
 699 static void cm_reset_to_idle(struct cm_id_private *cm_id_priv)
 700 {
 701         unsigned long flags;
 702
 703         cm_id_priv->id.state = IB_CM_IDLE;
 704         if (cm_id_priv->timewait_info) {
 705                 spin_lock_irqsave(&cm.lock, flags);
 706                 cm_cleanup_timewait(cm_id_priv->timewait_info);
 707                 spin_unlock_irqrestore(&cm.lock, flags);
 708                 kfree(cm_id_priv->timewait_info);
 709                 cm_id_priv->timewait_info = NULL;
 710         }
 711 }
 712
 713 static void cm_destroy_id(struct ib_cm_id *cm_id, int err)
 714 {
 715         struct cm_id_private *cm_id_priv;
 716         struct cm_work *work;
 717         unsigned long flags;
 718
 719         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
 720 retest:
 721         spin_lock_irqsave(&cm_id_priv->lock, flags);
 722         switch (cm_id->state) {
 723         case IB_CM_LISTEN:
 724                 cm_id->state = IB_CM_IDLE;
 725                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 726                 spin_lock_irqsave(&cm.lock, flags);
 727                 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table);
 728                 spin_unlock_irqrestore(&cm.lock, flags);
 729                 break;
 730         case IB_CM_SIDR_REQ_SENT:
 731                 cm_id->state = IB_CM_IDLE;
 732                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
 733                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 734                 break;
 735         case IB_CM_SIDR_REQ_RCVD:
 736                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 737                 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT);
 738                 break;
 739         case IB_CM_REQ_SENT:
 740                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
 741                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 742                 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT,
 743                                &cm_id_priv->av.port->cm_dev->ca_guid,
 744                                sizeof cm_id_priv->av.port->cm_dev->ca_guid,
 745                                NULL, 0);
 746                 break;
 747         case IB_CM_REQ_RCVD:
 748                 if (err == -ENOMEM) {
 749                         /* Do not reject to allow future retries. */
 750                         cm_reset_to_idle(cm_id_priv);
 751                         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 752                 } else {
 753                         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 754                         ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
 755                                        NULL, 0, NULL, 0);
 756                 }
 757                 break;
 758         case IB_CM_MRA_REQ_RCVD:
 759         case IB_CM_REP_SENT:
 760         case IB_CM_MRA_REP_RCVD:
 761                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
 762                 /* Fall through */
 763         case IB_CM_MRA_REQ_SENT:
 764         case IB_CM_REP_RCVD:
 765         case IB_CM_MRA_REP_SENT:
 766                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 767                 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
 768                                NULL, 0, NULL, 0);
 769                 break;
 770         case IB_CM_ESTABLISHED:
 771                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 772                 ib_send_cm_dreq(cm_id, NULL, 0);
 773                 goto retest;
 774         case IB_CM_DREQ_SENT:
 775                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
 776                 cm_enter_timewait(cm_id_priv);
 777                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 778                 break;
 779         case IB_CM_DREQ_RCVD:
 780                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 781                 ib_send_cm_drep(cm_id, NULL, 0);
 782                 break;
 783         default:
 784                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 785                 break;
 786         }
 787
 788         cm_free_id(cm_id->local_id);
 789         cm_deref_id(cm_id_priv);
 790         wait_for_completion(&cm_id_priv->comp);
 791         while ((work = cm_dequeue_work(cm_id_priv)) != NULL)
 792                 cm_free_work(work);
 793         kfree(cm_id_priv->compare_data);
 794         kfree(cm_id_priv->private_data);
 795         kfree(cm_id_priv);
 796 }
 797
 798 void ib_destroy_cm_id(struct ib_cm_id *cm_id)
 799 {
 800         cm_destroy_id(cm_id, 0);
 801 }
 802 EXPORT_SYMBOL(ib_destroy_cm_id);
 803
 804 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask,
 805                  struct ib_cm_compare_data *compare_data)
 806 {
 807         struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
 808         unsigned long flags;
 809         int ret = 0;
 810
 811         service_mask = service_mask ? service_mask :
 812                        __constant_cpu_to_be64(~0ULL);
 813         service_id &= service_mask;
 814         if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID &&
 815             (service_id != IB_CM_ASSIGN_SERVICE_ID))
 816                 return -EINVAL;
 817
 818         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
 819         if (cm_id->state != IB_CM_IDLE)
 820                 return -EINVAL;
 821
 822         if (compare_data) {
 823                 cm_id_priv->compare_data = kzalloc(sizeof *compare_data,
 824                                                    GFP_KERNEL);
 825                 if (!cm_id_priv->compare_data)
 826                         return -ENOMEM;
 827                 cm_mask_copy(cm_id_priv->compare_data->data,
 828                              compare_data->data, compare_data->mask);
 829                 memcpy(cm_id_priv->compare_data->mask, compare_data->mask,
 830                        IB_CM_COMPARE_SIZE);
 831         }
 832
 833         cm_id->state = IB_CM_LISTEN;
 834
 835         spin_lock_irqsave(&cm.lock, flags);
 836         if (service_id == IB_CM_ASSIGN_SERVICE_ID) {
 837                 cm_id->service_id = cpu_to_be64(cm.listen_service_id++);
 838                 cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
 839         } else {
 840                 cm_id->service_id = service_id;
 841                 cm_id->service_mask = service_mask;
 842         }
 843         cur_cm_id_priv = cm_insert_listen(cm_id_priv);
 844         spin_unlock_irqrestore(&cm.lock, flags);
 845
 846         if (cur_cm_id_priv) {
 847                 cm_id->state = IB_CM_IDLE;
 848                 kfree(cm_id_priv->compare_data);
 849                 cm_id_priv->compare_data = NULL;
 850                 ret = -EBUSY;
 851         }
 852         return ret;
 853 }
 854 EXPORT_SYMBOL(ib_cm_listen);
 855
 856 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv,
 857                           enum cm_msg_sequence msg_seq)
 858 {
 859         u64 hi_tid, low_tid;
 860
 861         hi_tid   = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32;
 862         low_tid  = (u64) ((__force u32)cm_id_priv->id.local_id |
 863                           (msg_seq << 30));
 864         return cpu_to_be64(hi_tid | low_tid);
 865 }
 866
 867 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr,
 868                               __be16 attr_id, __be64 tid)
 869 {
 870         hdr->base_version  = IB_MGMT_BASE_VERSION;
 871         hdr->mgmt_class    = IB_MGMT_CLASS_CM;
 872         hdr->class_version = IB_CM_CLASS_VERSION;
 873         hdr->method        = IB_MGMT_METHOD_SEND;
 874         hdr->attr_id       = attr_id;
 875         hdr->tid           = tid;
 876 }
 877
 878 static void cm_format_req(struct cm_req_msg *req_msg,
 879                           struct cm_id_private *cm_id_priv,
 880                           struct ib_cm_req_param *param)
 881 {
 882         cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID,
 883                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ));
 884
 885         req_msg->local_comm_id = cm_id_priv->id.local_id;
 886         req_msg->service_id = param->service_id;
 887         req_msg->local_ca_guid = cm_id_priv->av.port->cm_dev->ca_guid;
 888         cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num));
 889         cm_req_set_resp_res(req_msg, param->responder_resources);
 890         cm_req_set_init_depth(req_msg, param->initiator_depth);
 891         cm_req_set_remote_resp_timeout(req_msg,
 892                                        param->remote_cm_response_timeout);
 893         cm_req_set_qp_type(req_msg, param->qp_type);
 894         cm_req_set_flow_ctrl(req_msg, param->flow_control);
 895         cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn));
 896         cm_req_set_local_resp_timeout(req_msg,
 897                                       param->local_cm_response_timeout);
 898         cm_req_set_retry_count(req_msg, param->retry_count);
 899         req_msg->pkey = param->primary_path->pkey;
 900         cm_req_set_path_mtu(req_msg, param->primary_path->mtu);
 901         cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count);
 902         cm_req_set_max_cm_retries(req_msg, param->max_cm_retries);
 903         cm_req_set_srq(req_msg, param->srq);
 904
 905         req_msg->primary_local_lid = param->primary_path->slid;
 906         req_msg->primary_remote_lid = param->primary_path->dlid;
 907         req_msg->primary_local_gid = param->primary_path->sgid;
 908         req_msg->primary_remote_gid = param->primary_path->dgid;
 909         cm_req_set_primary_flow_label(req_msg, param->primary_path->flow_label);
 910         cm_req_set_primary_packet_rate(req_msg, param->primary_path->rate);
 911         req_msg->primary_traffic_class = param->primary_path->traffic_class;
 912         req_msg->primary_hop_limit = param->primary_path->hop_limit;
 913         cm_req_set_primary_sl(req_msg, param->primary_path->sl);
 914         cm_req_set_primary_subnet_local(req_msg, 1); /* local only... */
 915         cm_req_set_primary_local_ack_timeout(req_msg,
 916                 min(31, param->primary_path->packet_life_time + 1));
 917
 918         if (param->alternate_path) {
 919                 req_msg->alt_local_lid = param->alternate_path->slid;
 920                 req_msg->alt_remote_lid = param->alternate_path->dlid;
 921                 req_msg->alt_local_gid = param->alternate_path->sgid;
 922                 req_msg->alt_remote_gid = param->alternate_path->dgid;
 923                 cm_req_set_alt_flow_label(req_msg,
 924                                           param->alternate_path->flow_label);
 925                 cm_req_set_alt_packet_rate(req_msg, param->alternate_path->rate);
 926                 req_msg->alt_traffic_class = param->alternate_path->traffic_class;
 927                 req_msg->alt_hop_limit = param->alternate_path->hop_limit;
 928                 cm_req_set_alt_sl(req_msg, param->alternate_path->sl);
 929                 cm_req_set_alt_subnet_local(req_msg, 1); /* local only... */
 930                 cm_req_set_alt_local_ack_timeout(req_msg,
 931                         min(31, param->alternate_path->packet_life_time + 1));
 932         }
 933
 934         if (param->private_data && param->private_data_len)
 935                 memcpy(req_msg->private_data, param->private_data,
 936                        param->private_data_len);
 937 }
 938
 939 static int cm_validate_req_param(struct ib_cm_req_param *param)
 940 {
 941         /* peer-to-peer not supported */
 942         if (param->peer_to_peer)
 943                 return -EINVAL;
 944
 945         if (!param->primary_path)
 946                 return -EINVAL;
 947
 948         if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC)
 949                 return -EINVAL;
 950
 951         if (param->private_data &&
 952             param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE)
 953                 return -EINVAL;
 954
 955         if (param->alternate_path &&
 956             (param->alternate_path->pkey != param->primary_path->pkey ||
 957              param->alternate_path->mtu != param->primary_path->mtu))
 958                 return -EINVAL;
 959
 960         return 0;
 961 }
 962
 963 int ib_send_cm_req(struct ib_cm_id *cm_id,
 964                    struct ib_cm_req_param *param)
 965 {
 966         struct cm_id_private *cm_id_priv;
 967         struct cm_req_msg *req_msg;
 968         unsigned long flags;
 969         int ret;
 970
 971         ret = cm_validate_req_param(param);
 972         if (ret)
 973                 return ret;
 974
 975         /* Verify that we're not in timewait. */
 976         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
 977         spin_lock_irqsave(&cm_id_priv->lock, flags);
 978         if (cm_id->state != IB_CM_IDLE) {
 979                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 980                 ret = -EINVAL;
 981                 goto out;
 982         }
 983         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 984
 985         cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
 986                                                             id.local_id);
 987         if (IS_ERR(cm_id_priv->timewait_info)) {
 988                 ret = PTR_ERR(cm_id_priv->timewait_info);
 989                 goto out;
 990         }
 991
 992         ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av);
 993         if (ret)
 994                 goto error1;
 995         if (param->alternate_path) {
 996                 ret = cm_init_av_by_path(param->alternate_path,
 997                                          &cm_id_priv->alt_av);
 998                 if (ret)
 999                         goto error1;
1000         }
1001         cm_id->service_id = param->service_id;
1002         cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
1003         cm_id_priv->timeout_ms = cm_convert_to_ms(
1004                                     param->primary_path->packet_life_time) * 2 +
1005                                  cm_convert_to_ms(
1006                                     param->remote_cm_response_timeout);
1007         cm_id_priv->max_cm_retries = param->max_cm_retries;
1008         cm_id_priv->initiator_depth = param->initiator_depth;
1009         cm_id_priv->responder_resources = param->responder_resources;
1010         cm_id_priv->retry_count = param->retry_count;
1011         cm_id_priv->path_mtu = param->primary_path->mtu;
1012         cm_id_priv->qp_type = param->qp_type;
1013
1014         ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg);
1015         if (ret)
1016                 goto error1;
1017
1018         req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad;
1019         cm_format_req(req_msg, cm_id_priv, param);
1020         cm_id_priv->tid = req_msg->hdr.tid;
1021         cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms;
1022         cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT;
1023
1024         cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg);
1025         cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg);
1026         cm_id_priv->local_ack_timeout =
1027                                 cm_req_get_primary_local_ack_timeout(req_msg);
1028
1029         spin_lock_irqsave(&cm_id_priv->lock, flags);
1030         ret = ib_post_send_mad(cm_id_priv->msg, NULL);
1031         if (ret) {
1032                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1033                 goto error2;
1034         }
1035         BUG_ON(cm_id->state != IB_CM_IDLE);
1036         cm_id->state = IB_CM_REQ_SENT;
1037         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1038         return 0;
1039
1040 error2: cm_free_msg(cm_id_priv->msg);
1041 error1: kfree(cm_id_priv->timewait_info);
1042 out:    return ret;
1043 }
1044 EXPORT_SYMBOL(ib_send_cm_req);
1045
1046 static int cm_issue_rej(struct cm_port *port,
1047                         struct ib_mad_recv_wc *mad_recv_wc,
1048                         enum ib_cm_rej_reason reason,
1049                         enum cm_msg_response msg_rejected,
1050                         void *ari, u8 ari_length)
1051 {
1052         struct ib_mad_send_buf *msg = NULL;
1053         struct cm_rej_msg *rej_msg, *rcv_msg;
1054         int ret;
1055
1056         ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
1057         if (ret)
1058                 return ret;
1059
1060         /* We just need common CM header information.  Cast to any message. */
1061         rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad;
1062         rej_msg = (struct cm_rej_msg *) msg->mad;
1063
1064         cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid);
1065         rej_msg->remote_comm_id = rcv_msg->local_comm_id;
1066         rej_msg->local_comm_id = rcv_msg->remote_comm_id;
1067         cm_rej_set_msg_rejected(rej_msg, msg_rejected);
1068         rej_msg->reason = cpu_to_be16(reason);
1069
1070         if (ari && ari_length) {
1071                 cm_rej_set_reject_info_len(rej_msg, ari_length);
1072                 memcpy(rej_msg->ari, ari, ari_length);
1073         }
1074
1075         ret = ib_post_send_mad(msg, NULL);
1076         if (ret)
1077                 cm_free_msg(msg);
1078
1079         return ret;
1080 }
1081
1082 static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid,
1083                                     __be32 local_qpn, __be32 remote_qpn)
1084 {
1085         return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) ||
1086                 ((local_ca_guid == remote_ca_guid) &&
1087                  (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn))));
1088 }
1089
1090 static void cm_format_paths_from_req(struct cm_req_msg *req_msg,
1091                                             struct ib_sa_path_rec *primary_path,
1092                                             struct ib_sa_path_rec *alt_path)
1093 {
1094         memset(primary_path, 0, sizeof *primary_path);
1095         primary_path->dgid = req_msg->primary_local_gid;
1096         primary_path->sgid = req_msg->primary_remote_gid;
1097         primary_path->dlid = req_msg->primary_local_lid;
1098         primary_path->slid = req_msg->primary_remote_lid;
1099         primary_path->flow_label = cm_req_get_primary_flow_label(req_msg);
1100         primary_path->hop_limit = req_msg->primary_hop_limit;
1101         primary_path->traffic_class = req_msg->primary_traffic_class;
1102         primary_path->reversible = 1;
1103         primary_path->pkey = req_msg->pkey;
1104         primary_path->sl = cm_req_get_primary_sl(req_msg);
1105         primary_path->mtu_selector = IB_SA_EQ;
1106         primary_path->mtu = cm_req_get_path_mtu(req_msg);
1107         primary_path->rate_selector = IB_SA_EQ;
1108         primary_path->rate = cm_req_get_primary_packet_rate(req_msg);
1109         primary_path->packet_life_time_selector = IB_SA_EQ;
1110         primary_path->packet_life_time =
1111                 cm_req_get_primary_local_ack_timeout(req_msg);
1112         primary_path->packet_life_time -= (primary_path->packet_life_time > 0);
1113
1114         if (req_msg->alt_local_lid) {
1115                 memset(alt_path, 0, sizeof *alt_path);
1116                 alt_path->dgid = req_msg->alt_local_gid;
1117                 alt_path->sgid = req_msg->alt_remote_gid;
1118                 alt_path->dlid = req_msg->alt_local_lid;
1119                 alt_path->slid = req_msg->alt_remote_lid;
1120                 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg);
1121                 alt_path->hop_limit = req_msg->alt_hop_limit;
1122                 alt_path->traffic_class = req_msg->alt_traffic_class;
1123                 alt_path->reversible = 1;
1124                 alt_path->pkey = req_msg->pkey;
1125                 alt_path->sl = cm_req_get_alt_sl(req_msg);
1126                 alt_path->mtu_selector = IB_SA_EQ;
1127                 alt_path->mtu = cm_req_get_path_mtu(req_msg);
1128                 alt_path->rate_selector = IB_SA_EQ;
1129                 alt_path->rate = cm_req_get_alt_packet_rate(req_msg);
1130                 alt_path->packet_life_time_selector = IB_SA_EQ;
1131                 alt_path->packet_life_time =
1132                         cm_req_get_alt_local_ack_timeout(req_msg);
1133                 alt_path->packet_life_time -= (alt_path->packet_life_time > 0);
1134         }
1135 }
1136
1137 static void cm_format_req_event(struct cm_work *work,
1138                                 struct cm_id_private *cm_id_priv,
1139                                 struct ib_cm_id *listen_id)
1140 {
1141         struct cm_req_msg *req_msg;
1142         struct ib_cm_req_event_param *param;
1143
1144         req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1145         param = &work->cm_event.param.req_rcvd;
1146         param->listen_id = listen_id;
1147         param->port = cm_id_priv->av.port->port_num;
1148         param->primary_path = &work->path[0];
1149         if (req_msg->alt_local_lid)
1150                 param->alternate_path = &work->path[1];
1151         else
1152                 param->alternate_path = NULL;
1153         param->remote_ca_guid = req_msg->local_ca_guid;
1154         param->remote_qkey = be32_to_cpu(req_msg->local_qkey);
1155         param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg));
1156         param->qp_type = cm_req_get_qp_type(req_msg);
1157         param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg));
1158         param->responder_resources = cm_req_get_init_depth(req_msg);
1159         param->initiator_depth = cm_req_get_resp_res(req_msg);
1160         param->local_cm_response_timeout =
1161                                         cm_req_get_remote_resp_timeout(req_msg);
1162         param->flow_control = cm_req_get_flow_ctrl(req_msg);
1163         param->remote_cm_response_timeout =
1164                                         cm_req_get_local_resp_timeout(req_msg);
1165         param->retry_count = cm_req_get_retry_count(req_msg);
1166         param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1167         param->srq = cm_req_get_srq(req_msg);
1168         work->cm_event.private_data = &req_msg->private_data;
1169 }
1170
1171 static void cm_process_work(struct cm_id_private *cm_id_priv,
1172                             struct cm_work *work)
1173 {
1174         unsigned long flags;
1175         int ret;
1176
1177         /* We will typically only have the current event to report. */
1178         ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
1179         cm_free_work(work);
1180
1181         while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) {
1182                 spin_lock_irqsave(&cm_id_priv->lock, flags);
1183                 work = cm_dequeue_work(cm_id_priv);
1184                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1185                 BUG_ON(!work);
1186                 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id,
1187                                                 &work->cm_event);
1188                 cm_free_work(work);
1189         }
1190         cm_deref_id(cm_id_priv);
1191         if (ret)
1192                 cm_destroy_id(&cm_id_priv->id, ret);
1193 }
1194
1195 static void cm_format_mra(struct cm_mra_msg *mra_msg,
1196                           struct cm_id_private *cm_id_priv,
1197                           enum cm_msg_response msg_mraed, u8 service_timeout,
1198                           const void *private_data, u8 private_data_len)
1199 {
1200         cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid);
1201         cm_mra_set_msg_mraed(mra_msg, msg_mraed);
1202         mra_msg->local_comm_id = cm_id_priv->id.local_id;
1203         mra_msg->remote_comm_id = cm_id_priv->id.remote_id;
1204         cm_mra_set_service_timeout(mra_msg, service_timeout);
1205
1206         if (private_data && private_data_len)
1207                 memcpy(mra_msg->private_data, private_data, private_data_len);
1208 }
1209
1210 static void cm_format_rej(struct cm_rej_msg *rej_msg,
1211                           struct cm_id_private *cm_id_priv,
1212                           enum ib_cm_rej_reason reason,
1213                           void *ari,
1214                           u8 ari_length,
1215                           const void *private_data,
1216                           u8 private_data_len)
1217 {
1218         cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid);
1219         rej_msg->remote_comm_id = cm_id_priv->id.remote_id;
1220
1221         switch(cm_id_priv->id.state) {
1222         case IB_CM_REQ_RCVD:
1223                 rej_msg->local_comm_id = 0;
1224                 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1225                 break;
1226         case IB_CM_MRA_REQ_SENT:
1227                 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1228                 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1229                 break;
1230         case IB_CM_REP_RCVD:
1231         case IB_CM_MRA_REP_SENT:
1232                 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1233                 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP);
1234                 break;
1235         default:
1236                 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1237                 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER);
1238                 break;
1239         }
1240
1241         rej_msg->reason = cpu_to_be16(reason);
1242         if (ari && ari_length) {
1243                 cm_rej_set_reject_info_len(rej_msg, ari_length);
1244                 memcpy(rej_msg->ari, ari, ari_length);
1245         }
1246
1247         if (private_data && private_data_len)
1248                 memcpy(rej_msg->private_data, private_data, private_data_len);
1249 }
1250
1251 static void cm_dup_req_handler(struct cm_work *work,
1252                                struct cm_id_private *cm_id_priv)
1253 {
1254         struct ib_mad_send_buf *msg = NULL;
1255         unsigned long flags;
1256         int ret;
1257
1258         /* Quick state check to discard duplicate REQs. */
1259         if (cm_id_priv->id.state == IB_CM_REQ_RCVD)
1260                 return;
1261
1262         ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1263         if (ret)
1264                 return;
1265
1266         spin_lock_irqsave(&cm_id_priv->lock, flags);
1267         switch (cm_id_priv->id.state) {
1268         case IB_CM_MRA_REQ_SENT:
1269                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1270                               CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout,
1271                               cm_id_priv->private_data,
1272                               cm_id_priv->private_data_len);
1273                 break;
1274         case IB_CM_TIMEWAIT:
1275                 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv,
1276                               IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0);
1277                 break;
1278         default:
1279                 goto unlock;
1280         }
1281         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1282
1283         ret = ib_post_send_mad(msg, NULL);
1284         if (ret)
1285                 goto free;
1286         return;
1287
1288 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1289 free:   cm_free_msg(msg);
1290 }
1291
1292 static struct cm_id_private * cm_match_req(struct cm_work *work,
1293                                            struct cm_id_private *cm_id_priv)
1294 {
1295         struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv;
1296         struct cm_timewait_info *timewait_info;
1297         struct cm_req_msg *req_msg;
1298         unsigned long flags;
1299
1300         req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1301
1302         /* Check for duplicate REQ and stale connections. */
1303         spin_lock_irqsave(&cm.lock, flags);
1304         timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info);
1305         if (!timewait_info)
1306                 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
1307
1308         if (timewait_info) {
1309                 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
1310                                            timewait_info->work.remote_id);
1311                 cm_cleanup_timewait(cm_id_priv->timewait_info);
1312                 spin_unlock_irqrestore(&cm.lock, flags);
1313                 if (cur_cm_id_priv) {
1314                         cm_dup_req_handler(work, cur_cm_id_priv);
1315                         cm_deref_id(cur_cm_id_priv);
1316                 } else
1317                         cm_issue_rej(work->port, work->mad_recv_wc,
1318                                      IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
1319                                      NULL, 0);
1320                 listen_cm_id_priv = NULL;
1321                 goto out;
1322         }
1323
1324         /* Find matching listen request. */
1325         listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device,
1326                                            req_msg->service_id,
1327                                            req_msg->private_data);
1328         if (!listen_cm_id_priv) {
1329                 cm_cleanup_timewait(cm_id_priv->timewait_info);
1330                 spin_unlock_irqrestore(&cm.lock, flags);
1331                 cm_issue_rej(work->port, work->mad_recv_wc,
1332                              IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ,
1333                              NULL, 0);
1334                 goto out;
1335         }
1336         atomic_inc(&listen_cm_id_priv->refcount);
1337         atomic_inc(&cm_id_priv->refcount);
1338         cm_id_priv->id.state = IB_CM_REQ_RCVD;
1339         atomic_inc(&cm_id_priv->work_count);
1340         spin_unlock_irqrestore(&cm.lock, flags);
1341 out:
1342         return listen_cm_id_priv;
1343 }
1344
1345 static int cm_req_handler(struct cm_work *work)
1346 {
1347         struct ib_cm_id *cm_id;
1348         struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
1349         struct cm_req_msg *req_msg;
1350         int ret;
1351
1352         req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1353
1354         cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL);
1355         if (IS_ERR(cm_id))
1356                 return PTR_ERR(cm_id);
1357
1358         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1359         cm_id_priv->id.remote_id = req_msg->local_comm_id;
1360         cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
1361                                 work->mad_recv_wc->recv_buf.grh,
1362                                 &cm_id_priv->av);
1363         cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1364                                                             id.local_id);
1365         if (IS_ERR(cm_id_priv->timewait_info)) {
1366                 ret = PTR_ERR(cm_id_priv->timewait_info);
1367                 goto destroy;
1368         }
1369         cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id;
1370         cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid;
1371         cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg);
1372
1373         listen_cm_id_priv = cm_match_req(work, cm_id_priv);
1374         if (!listen_cm_id_priv) {
1375                 ret = -EINVAL;
1376                 kfree(cm_id_priv->timewait_info);
1377                 goto destroy;
1378         }
1379
1380         cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
1381         cm_id_priv->id.context = listen_cm_id_priv->id.context;
1382         cm_id_priv->id.service_id = req_msg->service_id;
1383         cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL);
1384
1385         cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]);
1386         ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av);
1387         if (ret) {
1388                 ib_get_cached_gid(work->port->cm_dev->device,
1389                                   work->port->port_num, 0, &work->path[0].sgid);
1390                 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID,
1391                                &work->path[0].sgid, sizeof work->path[0].sgid,
1392                                NULL, 0);
1393                 goto rejected;
1394         }
1395         if (req_msg->alt_local_lid) {
1396                 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av);
1397                 if (ret) {
1398                         ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID,
1399                                        &work->path[0].sgid,
1400                                        sizeof work->path[0].sgid, NULL, 0);
1401                         goto rejected;
1402                 }
1403         }
1404         cm_id_priv->tid = req_msg->hdr.tid;
1405         cm_id_priv->timeout_ms = cm_convert_to_ms(
1406                                         cm_req_get_local_resp_timeout(req_msg));
1407         cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg);
1408         cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg);
1409         cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg);
1410         cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg);
1411         cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg);
1412         cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg);
1413         cm_id_priv->local_ack_timeout =
1414                                 cm_req_get_primary_local_ack_timeout(req_msg);
1415         cm_id_priv->retry_count = cm_req_get_retry_count(req_msg);
1416         cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1417         cm_id_priv->qp_type = cm_req_get_qp_type(req_msg);
1418
1419         cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
1420         cm_process_work(cm_id_priv, work);
1421         cm_deref_id(listen_cm_id_priv);
1422         return 0;
1423
1424 rejected:
1425         atomic_dec(&cm_id_priv->refcount);
1426         cm_deref_id(listen_cm_id_priv);
1427 destroy:
1428         ib_destroy_cm_id(cm_id);
1429         return ret;
1430 }
1431
1432 static void cm_format_rep(struct cm_rep_msg *rep_msg,
1433                           struct cm_id_private *cm_id_priv,
1434                           struct ib_cm_rep_param *param)
1435 {
1436         cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid);
1437         rep_msg->local_comm_id = cm_id_priv->id.local_id;
1438         rep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1439         cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num));
1440         cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn));
1441         rep_msg->resp_resources = param->responder_resources;
1442         rep_msg->initiator_depth = param->initiator_depth;
1443         cm_rep_set_target_ack_delay(rep_msg, param->target_ack_delay);
1444         cm_rep_set_failover(rep_msg, param->failover_accepted);
1445         cm_rep_set_flow_ctrl(rep_msg, param->flow_control);
1446         cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count);
1447         cm_rep_set_srq(rep_msg, param->srq);
1448         rep_msg->local_ca_guid = cm_id_priv->av.port->cm_dev->ca_guid;
1449
1450         if (param->private_data && param->private_data_len)
1451                 memcpy(rep_msg->private_data, param->private_data,
1452                        param->private_data_len);
1453 }
1454
1455 int ib_send_cm_rep(struct ib_cm_id *cm_id,
1456                    struct ib_cm_rep_param *param)
1457 {
1458         struct cm_id_private *cm_id_priv;
1459         struct ib_mad_send_buf *msg;
1460         struct cm_rep_msg *rep_msg;
1461         unsigned long flags;
1462         int ret;
1463
1464         if (param->private_data &&
1465             param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE)
1466                 return -EINVAL;
1467
1468         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1469         spin_lock_irqsave(&cm_id_priv->lock, flags);
1470         if (cm_id->state != IB_CM_REQ_RCVD &&
1471             cm_id->state != IB_CM_MRA_REQ_SENT) {
1472                 ret = -EINVAL;
1473                 goto out;
1474         }
1475
1476         ret = cm_alloc_msg(cm_id_priv, &msg);
1477         if (ret)
1478                 goto out;
1479
1480         rep_msg = (struct cm_rep_msg *) msg->mad;
1481         cm_format_rep(rep_msg, cm_id_priv, param);
1482         msg->timeout_ms = cm_id_priv->timeout_ms;
1483         msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;
1484
1485         ret = ib_post_send_mad(msg, NULL);
1486         if (ret) {
1487                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1488                 cm_free_msg(msg);
1489                 return ret;
1490         }
1491
1492         cm_id->state = IB_CM_REP_SENT;
1493         cm_id_priv->msg = msg;
1494         cm_id_priv->initiator_depth = param->initiator_depth;
1495         cm_id_priv->responder_resources = param->responder_resources;
1496         cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg);
1497         cm_id_priv->local_qpn = cm_rep_get_local_qpn(rep_msg);
1498
1499 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1500         return ret;
1501 }
1502 EXPORT_SYMBOL(ib_send_cm_rep);
1503
1504 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg,
1505                           struct cm_id_private *cm_id_priv,
1506                           const void *private_data,
1507                           u8 private_data_len)
1508 {
1509         cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid);
1510         rtu_msg->local_comm_id = cm_id_priv->id.local_id;
1511         rtu_msg->remote_comm_id = cm_id_priv->id.remote_id;
1512
1513         if (private_data && private_data_len)
1514                 memcpy(rtu_msg->private_data, private_data, private_data_len);
1515 }
1516
1517 int ib_send_cm_rtu(struct ib_cm_id *cm_id,
1518                    const void *private_data,
1519                    u8 private_data_len)
1520 {
1521         struct cm_id_private *cm_id_priv;
1522         struct ib_mad_send_buf *msg;
1523         unsigned long flags;
1524         void *data;
1525         int ret;
1526
1527         if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE)
1528                 return -EINVAL;
1529
1530         data = cm_copy_private_data(private_data, private_data_len);
1531         if (IS_ERR(data))
1532                 return PTR_ERR(data);
1533
1534         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1535         spin_lock_irqsave(&cm_id_priv->lock, flags);
1536         if (cm_id->state != IB_CM_REP_RCVD &&
1537             cm_id->state != IB_CM_MRA_REP_SENT) {
1538                 ret = -EINVAL;
1539                 goto error;
1540         }
1541
1542         ret = cm_alloc_msg(cm_id_priv, &msg);
1543         if (ret)
1544                 goto error;
1545
1546         cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1547                       private_data, private_data_len);
1548
1549         ret = ib_post_send_mad(msg, NULL);
1550         if (ret) {
1551                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1552                 cm_free_msg(msg);
1553                 kfree(data);
1554                 return ret;
1555         }
1556
1557         cm_id->state = IB_CM_ESTABLISHED;
1558         cm_set_private_data(cm_id_priv, data, private_data_len);
1559         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1560         return 0;
1561
1562 error:  spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1563         kfree(data);
1564         return ret;
1565 }
1566 EXPORT_SYMBOL(ib_send_cm_rtu);
1567
1568 static void cm_format_rep_event(struct cm_work *work)
1569 {
1570         struct cm_rep_msg *rep_msg;
1571         struct ib_cm_rep_event_param *param;
1572
1573         rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1574         param = &work->cm_event.param.rep_rcvd;
1575         param->remote_ca_guid = rep_msg->local_ca_guid;
1576         param->remote_qkey = be32_to_cpu(rep_msg->local_qkey);
1577         param->remote_qpn = be32_to_cpu(cm_rep_get_local_qpn(rep_msg));
1578         param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg));
1579         param->responder_resources = rep_msg->initiator_depth;
1580         param->initiator_depth = rep_msg->resp_resources;
1581         param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
1582         param->failover_accepted = cm_rep_get_failover(rep_msg);
1583         param->flow_control = cm_rep_get_flow_ctrl(rep_msg);
1584         param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1585         param->srq = cm_rep_get_srq(rep_msg);
1586         work->cm_event.private_data = &rep_msg->private_data;
1587 }
1588
1589 static void cm_dup_rep_handler(struct cm_work *work)
1590 {
1591         struct cm_id_private *cm_id_priv;
1592         struct cm_rep_msg *rep_msg;
1593         struct ib_mad_send_buf *msg = NULL;
1594         unsigned long flags;
1595         int ret;
1596
1597         rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad;
1598         cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id,
1599                                    rep_msg->local_comm_id);
1600         if (!cm_id_priv)
1601                 return;
1602
1603         ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1604         if (ret)
1605                 goto deref;
1606
1607         spin_lock_irqsave(&cm_id_priv->lock, flags);
1608         if (cm_id_priv->id.state == IB_CM_ESTABLISHED)
1609                 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1610                               cm_id_priv->private_data,
1611                               cm_id_priv->private_data_len);
1612         else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT)
1613                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1614                               CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout,
1615                               cm_id_priv->private_data,
1616                               cm_id_priv->private_data_len);
1617         else
1618                 goto unlock;
1619         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1620
1621         ret = ib_post_send_mad(msg, NULL);
1622         if (ret)
1623                 goto free;
1624         goto deref;
1625
1626 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1627 free:   cm_free_msg(msg);
1628 deref:  cm_deref_id(cm_id_priv);
1629 }
1630
1631 static int cm_rep_handler(struct cm_work *work)
1632 {
1633         struct cm_id_private *cm_id_priv;
1634         struct cm_rep_msg *rep_msg;
1635         unsigned long flags;
1636         int ret;
1637
1638         rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1639         cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0);
1640         if (!cm_id_priv) {
1641                 cm_dup_rep_handler(work);
1642                 return -EINVAL;
1643         }
1644
1645         cm_format_rep_event(work);
1646
1647         spin_lock_irqsave(&cm_id_priv->lock, flags);
1648         switch (cm_id_priv->id.state) {
1649         case IB_CM_REQ_SENT:
1650         case IB_CM_MRA_REQ_RCVD:
1651                 break;
1652         default:
1653                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1654                 ret = -EINVAL;
1655                 goto error;
1656         }
1657
1658         cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id;
1659         cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid;
1660         cm_id_priv->timewait_info->remote_qpn = cm_rep_get_local_qpn(rep_msg);
1661
1662         spin_lock(&cm.lock);
1663         /* Check for duplicate REP. */
1664         if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
1665                 spin_unlock(&cm.lock);
1666                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1667                 ret = -EINVAL;
1668                 goto error;
1669         }
1670         /* Check for a stale connection. */
1671         if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) {
1672                 rb_erase(&cm_id_priv->timewait_info->remote_id_node,
1673                          &cm.remote_id_table);
1674                 cm_id_priv->timewait_info->inserted_remote_id = 0;
1675                 spin_unlock(&cm.lock);
1676                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1677                 cm_issue_rej(work->port, work->mad_recv_wc,
1678                              IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP,
1679                              NULL, 0);
1680                 ret = -EINVAL;
1681                 goto error;
1682         }
1683         spin_unlock(&cm.lock);
1684
1685         cm_id_priv->id.state = IB_CM_REP_RCVD;
1686         cm_id_priv->id.remote_id = rep_msg->local_comm_id;
1687         cm_id_priv->remote_qpn = cm_rep_get_local_qpn(rep_msg);
1688         cm_id_priv->initiator_depth = rep_msg->resp_resources;
1689         cm_id_priv->responder_resources = rep_msg->initiator_depth;
1690         cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg);
1691         cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1692
1693         /* todo: handle peer_to_peer */
1694
1695         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1696         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1697         if (!ret)
1698                 list_add_tail(&work->list, &cm_id_priv->work_list);
1699         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1700
1701         if (ret)
1702                 cm_process_work(cm_id_priv, work);
1703         else
1704                 cm_deref_id(cm_id_priv);
1705         return 0;
1706
1707 error:
1708         cm_deref_id(cm_id_priv);
1709         return ret;
1710 }
1711
1712 static int cm_establish_handler(struct cm_work *work)
1713 {
1714         struct cm_id_private *cm_id_priv;
1715         unsigned long flags;
1716         int ret;
1717
1718         /* See comment in ib_cm_establish about lookup. */
1719         cm_id_priv = cm_acquire_id(work->local_id, work->remote_id);
1720         if (!cm_id_priv)
1721                 return -EINVAL;
1722
1723         spin_lock_irqsave(&cm_id_priv->lock, flags);
1724         if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
1725                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1726                 goto out;
1727         }
1728
1729         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1730         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1731         if (!ret)
1732                 list_add_tail(&work->list, &cm_id_priv->work_list);
1733         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1734
1735         if (ret)
1736                 cm_process_work(cm_id_priv, work);
1737         else
1738                 cm_deref_id(cm_id_priv);
1739         return 0;
1740 out:
1741         cm_deref_id(cm_id_priv);
1742         return -EINVAL;
1743 }
1744
1745 static int cm_rtu_handler(struct cm_work *work)
1746 {
1747         struct cm_id_private *cm_id_priv;
1748         struct cm_rtu_msg *rtu_msg;
1749         unsigned long flags;
1750         int ret;
1751
1752         rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad;
1753         cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id,
1754                                    rtu_msg->local_comm_id);
1755         if (!cm_id_priv)
1756                 return -EINVAL;
1757
1758         work->cm_event.private_data = &rtu_msg->private_data;
1759
1760         spin_lock_irqsave(&cm_id_priv->lock, flags);
1761         if (cm_id_priv->id.state != IB_CM_REP_SENT &&
1762             cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
1763                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1764                 goto out;
1765         }
1766         cm_id_priv->id.state = IB_CM_ESTABLISHED;
1767
1768         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1769         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1770         if (!ret)
1771                 list_add_tail(&work->list, &cm_id_priv->work_list);
1772         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1773
1774         if (ret)
1775                 cm_process_work(cm_id_priv, work);
1776         else
1777                 cm_deref_id(cm_id_priv);
1778         return 0;
1779 out:
1780         cm_deref_id(cm_id_priv);
1781         return -EINVAL;
1782 }
1783
1784 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg,
1785                           struct cm_id_private *cm_id_priv,
1786                           const void *private_data,
1787                           u8 private_data_len)
1788 {
1789         cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID,
1790                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ));
1791         dreq_msg->local_comm_id = cm_id_priv->id.local_id;
1792         dreq_msg->remote_comm_id = cm_id_priv->id.remote_id;
1793         cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn);
1794
1795         if (private_data && private_data_len)
1796                 memcpy(dreq_msg->private_data, private_data, private_data_len);
1797 }
1798
1799 int ib_send_cm_dreq(struct ib_cm_id *cm_id,
1800                     const void *private_data,
1801                     u8 private_data_len)
1802 {
1803         struct cm_id_private *cm_id_priv;
1804         struct ib_mad_send_buf *msg;
1805         unsigned long flags;
1806         int ret;
1807
1808         if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE)
1809                 return -EINVAL;
1810
1811         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1812         spin_lock_irqsave(&cm_id_priv->lock, flags);
1813         if (cm_id->state != IB_CM_ESTABLISHED) {
1814                 ret = -EINVAL;
1815                 goto out;
1816         }
1817
1818         ret = cm_alloc_msg(cm_id_priv, &msg);
1819         if (ret) {
1820                 cm_enter_timewait(cm_id_priv);
1821                 goto out;
1822         }
1823
1824         cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv,
1825                        private_data, private_data_len);
1826         msg->timeout_ms = cm_id_priv->timeout_ms;
1827         msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
1828
1829         ret = ib_post_send_mad(msg, NULL);
1830         if (ret) {
1831                 cm_enter_timewait(cm_id_priv);
1832                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1833                 cm_free_msg(msg);
1834                 return ret;
1835         }
1836
1837         cm_id->state = IB_CM_DREQ_SENT;
1838         cm_id_priv->msg = msg;
1839 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1840         return ret;
1841 }
1842 EXPORT_SYMBOL(ib_send_cm_dreq);
1843
1844 static void cm_format_drep(struct cm_drep_msg *drep_msg,
1845                           struct cm_id_private *cm_id_priv,
1846                           const void *private_data,
1847                           u8 private_data_len)
1848 {
1849         cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid);
1850         drep_msg->local_comm_id = cm_id_priv->id.local_id;
1851         drep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1852
1853         if (private_data && private_data_len)
1854                 memcpy(drep_msg->private_data, private_data, private_data_len);
1855 }
1856
1857 int ib_send_cm_drep(struct ib_cm_id *cm_id,
1858                     const void *private_data,
1859                     u8 private_data_len)
1860 {
1861         struct cm_id_private *cm_id_priv;
1862         struct ib_mad_send_buf *msg;
1863         unsigned long flags;
1864         void *data;
1865         int ret;
1866
1867         if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
1868                 return -EINVAL;
1869
1870         data = cm_copy_private_data(private_data, private_data_len);
1871         if (IS_ERR(data))
1872                 return PTR_ERR(data);
1873
1874         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1875         spin_lock_irqsave(&cm_id_priv->lock, flags);
1876         if (cm_id->state != IB_CM_DREQ_RCVD) {
1877                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1878                 kfree(data);
1879                 return -EINVAL;
1880         }
1881
1882         cm_set_private_data(cm_id_priv, data, private_data_len);
1883         cm_enter_timewait(cm_id_priv);
1884
1885         ret = cm_alloc_msg(cm_id_priv, &msg);
1886         if (ret)
1887                 goto out;
1888
1889         cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
1890                        private_data, private_data_len);
1891
1892         ret = ib_post_send_mad(msg, NULL);
1893         if (ret) {
1894                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1895                 cm_free_msg(msg);
1896                 return ret;
1897         }
1898
1899 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1900         return ret;
1901 }
1902 EXPORT_SYMBOL(ib_send_cm_drep);
1903
1904 static int cm_issue_drep(struct cm_port *port,
1905                          struct ib_mad_recv_wc *mad_recv_wc)
1906 {
1907         struct ib_mad_send_buf *msg = NULL;
1908         struct cm_dreq_msg *dreq_msg;
1909         struct cm_drep_msg *drep_msg;
1910         int ret;
1911
1912         ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
1913         if (ret)
1914                 return ret;
1915
1916         dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad;
1917         drep_msg = (struct cm_drep_msg *) msg->mad;
1918
1919         cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid);
1920         drep_msg->remote_comm_id = dreq_msg->local_comm_id;
1921         drep_msg->local_comm_id = dreq_msg->remote_comm_id;
1922
1923         ret = ib_post_send_mad(msg, NULL);
1924         if (ret)
1925                 cm_free_msg(msg);
1926
1927         return ret;
1928 }
1929
1930 static int cm_dreq_handler(struct cm_work *work)
1931 {
1932         struct cm_id_private *cm_id_priv;
1933         struct cm_dreq_msg *dreq_msg;
1934         struct ib_mad_send_buf *msg = NULL;
1935         unsigned long flags;
1936         int ret;
1937
1938         dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
1939         cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id,
1940                                    dreq_msg->local_comm_id);
1941         if (!cm_id_priv) {
1942                 cm_issue_drep(work->port, work->mad_recv_wc);
1943                 return -EINVAL;
1944         }
1945
1946         work->cm_event.private_data = &dreq_msg->private_data;
1947
1948         spin_lock_irqsave(&cm_id_priv->lock, flags);
1949         if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg))
1950                 goto unlock;
1951
1952         switch (cm_id_priv->id.state) {
1953         case IB_CM_REP_SENT:
1954         case IB_CM_DREQ_SENT:
1955                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1956                 break;
1957         case IB_CM_ESTABLISHED:
1958         case IB_CM_MRA_REP_RCVD:
1959                 break;
1960         case IB_CM_TIMEWAIT:
1961                 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
1962                         goto unlock;
1963
1964                 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
1965                                cm_id_priv->private_data,
1966                                cm_id_priv->private_data_len);
1967                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1968
1969                 if (ib_post_send_mad(msg, NULL))
1970                         cm_free_msg(msg);
1971                 goto deref;
1972         default:
1973                 goto unlock;
1974         }
1975         cm_id_priv->id.state = IB_CM_DREQ_RCVD;
1976         cm_id_priv->tid = dreq_msg->hdr.tid;
1977         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1978         if (!ret)
1979                 list_add_tail(&work->list, &cm_id_priv->work_list);
1980         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1981
1982         if (ret)
1983                 cm_process_work(cm_id_priv, work);
1984         else
1985                 cm_deref_id(cm_id_priv);
1986         return 0;
1987
1988 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1989 deref:  cm_deref_id(cm_id_priv);
1990         return -EINVAL;
1991 }
1992
1993 static int cm_drep_handler(struct cm_work *work)
1994 {
1995         struct cm_id_private *cm_id_priv;
1996         struct cm_drep_msg *drep_msg;
1997         unsigned long flags;
1998         int ret;
1999
2000         drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
2001         cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id,
2002                                    drep_msg->local_comm_id);
2003         if (!cm_id_priv)
2004                 return -EINVAL;
2005
2006         work->cm_event.private_data = &drep_msg->private_data;
2007
2008         spin_lock_irqsave(&cm_id_priv->lock, flags);
2009         if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
2010             cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
2011                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2012                 goto out;
2013         }
2014         cm_enter_timewait(cm_id_priv);
2015
2016         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2017         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2018         if (!ret)
2019                 list_add_tail(&work->list, &cm_id_priv->work_list);
2020         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2021
2022         if (ret)
2023                 cm_process_work(cm_id_priv, work);
2024         else
2025                 cm_deref_id(cm_id_priv);
2026         return 0;
2027 out:
2028         cm_deref_id(cm_id_priv);
2029         return -EINVAL;
2030 }
2031
2032 int ib_send_cm_rej(struct ib_cm_id *cm_id,
2033                    enum ib_cm_rej_reason reason,
2034                    void *ari,
2035                    u8 ari_length,
2036                    const void *private_data,
2037                    u8 private_data_len)
2038 {
2039         struct cm_id_private *cm_id_priv;
2040         struct ib_mad_send_buf *msg;
2041         unsigned long flags;
2042         int ret;
2043
2044         if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
2045             (ari && ari_length > IB_CM_REJ_ARI_LENGTH))
2046                 return -EINVAL;
2047
2048         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2049
2050         spin_lock_irqsave(&cm_id_priv->lock, flags);
2051         switch (cm_id->state) {
2052         case IB_CM_REQ_SENT:
2053         case IB_CM_MRA_REQ_RCVD:
2054         case IB_CM_REQ_RCVD:
2055         case IB_CM_MRA_REQ_SENT:
2056         case IB_CM_REP_RCVD:
2057         case IB_CM_MRA_REP_SENT:
2058                 ret = cm_alloc_msg(cm_id_priv, &msg);
2059                 if (!ret)
2060                         cm_format_rej((struct cm_rej_msg *) msg->mad,
2061                                       cm_id_priv, reason, ari, ari_length,
2062                                       private_data, private_data_len);
2063
2064                 cm_reset_to_idle(cm_id_priv);
2065                 break;
2066         case IB_CM_REP_SENT:
2067         case IB_CM_MRA_REP_RCVD:
2068                 ret = cm_alloc_msg(cm_id_priv, &msg);
2069                 if (!ret)
2070                         cm_format_rej((struct cm_rej_msg *) msg->mad,
2071                                       cm_id_priv, reason, ari, ari_length,
2072                                       private_data, private_data_len);
2073
2074                 cm_enter_timewait(cm_id_priv);
2075                 break;
2076         default:
2077                 ret = -EINVAL;
2078                 goto out;
2079         }
2080
2081         if (ret)
2082                 goto out;
2083
2084         ret = ib_post_send_mad(msg, NULL);
2085         if (ret)
2086                 cm_free_msg(msg);
2087
2088 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2089         return ret;
2090 }
2091 EXPORT_SYMBOL(ib_send_cm_rej);
2092
2093 static void cm_format_rej_event(struct cm_work *work)
2094 {
2095         struct cm_rej_msg *rej_msg;
2096         struct ib_cm_rej_event_param *param;
2097
2098         rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2099         param = &work->cm_event.param.rej_rcvd;
2100         param->ari = rej_msg->ari;
2101         param->ari_length = cm_rej_get_reject_info_len(rej_msg);
2102         param->reason = __be16_to_cpu(rej_msg->reason);
2103         work->cm_event.private_data = &rej_msg->private_data;
2104 }
2105
2106 static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
2107 {
2108         struct cm_timewait_info *timewait_info;
2109         struct cm_id_private *cm_id_priv;
2110         unsigned long flags;
2111         __be32 remote_id;
2112
2113         remote_id = rej_msg->local_comm_id;
2114
2115         if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) {
2116                 spin_lock_irqsave(&cm.lock, flags);
2117                 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari),
2118                                                   remote_id);
2119                 if (!timewait_info) {
2120                         spin_unlock_irqrestore(&cm.lock, flags);
2121                         return NULL;
2122                 }
2123                 cm_id_priv = idr_find(&cm.local_id_table, (__force int)
2124                                       (timewait_info->work.local_id ^
2125                                        cm.random_id_operand));
2126                 if (cm_id_priv) {
2127                         if (cm_id_priv->id.remote_id == remote_id)
2128                                 atomic_inc(&cm_id_priv->refcount);
2129                         else
2130                                 cm_id_priv = NULL;
2131                 }
2132                 spin_unlock_irqrestore(&cm.lock, flags);
2133         } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ)
2134                 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0);
2135         else
2136                 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id);
2137
2138         return cm_id_priv;
2139 }
2140
2141 static int cm_rej_handler(struct cm_work *work)
2142 {
2143         struct cm_id_private *cm_id_priv;
2144         struct cm_rej_msg *rej_msg;
2145         unsigned long flags;
2146         int ret;
2147
2148         rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2149         cm_id_priv = cm_acquire_rejected_id(rej_msg);
2150         if (!cm_id_priv)
2151                 return -EINVAL;
2152
2153         cm_format_rej_event(work);
2154
2155         spin_lock_irqsave(&cm_id_priv->lock, flags);
2156         switch (cm_id_priv->id.state) {
2157         case IB_CM_REQ_SENT:
2158         case IB_CM_MRA_REQ_RCVD:
2159         case IB_CM_REP_SENT:
2160         case IB_CM_MRA_REP_RCVD:
2161                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2162                 /* fall through */
2163         case IB_CM_REQ_RCVD:
2164         case IB_CM_MRA_REQ_SENT:
2165                 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN)
2166                         cm_enter_timewait(cm_id_priv);
2167                 else
2168                         cm_reset_to_idle(cm_id_priv);
2169                 break;
2170         case IB_CM_DREQ_SENT:
2171                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2172                 /* fall through */
2173         case IB_CM_REP_RCVD:
2174         case IB_CM_MRA_REP_SENT:
2175         case IB_CM_ESTABLISHED:
2176                 cm_enter_timewait(cm_id_priv);
2177                 break;
2178         default:
2179                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2180                 ret = -EINVAL;
2181                 goto out;
2182         }
2183
2184         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2185         if (!ret)
2186                 list_add_tail(&work->list, &cm_id_priv->work_list);
2187         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2188
2189         if (ret)
2190                 cm_process_work(cm_id_priv, work);
2191         else
2192                 cm_deref_id(cm_id_priv);
2193         return 0;
2194 out:
2195         cm_deref_id(cm_id_priv);
2196         return -EINVAL;
2197 }
2198
2199 int ib_send_cm_mra(struct ib_cm_id *cm_id,
2200                    u8 service_timeout,
2201                    const void *private_data,
2202                    u8 private_data_len)
2203 {
2204         struct cm_id_private *cm_id_priv;
2205         struct ib_mad_send_buf *msg;
2206         void *data;
2207         unsigned long flags;
2208         int ret;
2209
2210         if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE)
2211                 return -EINVAL;
2212
2213         data = cm_copy_private_data(private_data, private_data_len);
2214         if (IS_ERR(data))
2215                 return PTR_ERR(data);
2216
2217         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2218
2219         spin_lock_irqsave(&cm_id_priv->lock, flags);
2220         switch(cm_id_priv->id.state) {
2221         case IB_CM_REQ_RCVD:
2222                 ret = cm_alloc_msg(cm_id_priv, &msg);
2223                 if (ret)
2224                         goto error1;
2225
2226                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2227                               CM_MSG_RESPONSE_REQ, service_timeout,
2228                               private_data, private_data_len);
2229                 ret = ib_post_send_mad(msg, NULL);
2230                 if (ret)
2231                         goto error2;
2232                 cm_id->state = IB_CM_MRA_REQ_SENT;
2233                 break;
2234         case IB_CM_REP_RCVD:
2235                 ret = cm_alloc_msg(cm_id_priv, &msg);
2236                 if (ret)
2237                         goto error1;
2238
2239                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2240                               CM_MSG_RESPONSE_REP, service_timeout,
2241                               private_data, private_data_len);
2242                 ret = ib_post_send_mad(msg, NULL);
2243                 if (ret)
2244                         goto error2;
2245                 cm_id->state = IB_CM_MRA_REP_SENT;
2246                 break;
2247         case IB_CM_ESTABLISHED:
2248                 ret = cm_alloc_msg(cm_id_priv, &msg);
2249                 if (ret)
2250                         goto error1;
2251
2252                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2253                               CM_MSG_RESPONSE_OTHER, service_timeout,
2254                               private_data, private_data_len);
2255                 ret = ib_post_send_mad(msg, NULL);
2256                 if (ret)
2257                         goto error2;
2258                 cm_id->lap_state = IB_CM_MRA_LAP_SENT;
2259                 break;
2260         default:
2261                 ret = -EINVAL;
2262                 goto error1;
2263         }
2264         cm_id_priv->service_timeout = service_timeout;
2265         cm_set_private_data(cm_id_priv, data, private_data_len);
2266         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2267         return 0;
2268
2269 error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2270         kfree(data);
2271         return ret;
2272
2273 error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2274         kfree(data);
2275         cm_free_msg(msg);
2276         return ret;
2277 }
2278 EXPORT_SYMBOL(ib_send_cm_mra);
2279
2280 static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
2281 {
2282         switch (cm_mra_get_msg_mraed(mra_msg)) {
2283         case CM_MSG_RESPONSE_REQ:
2284                 return cm_acquire_id(mra_msg->remote_comm_id, 0);
2285         case CM_MSG_RESPONSE_REP:
2286         case CM_MSG_RESPONSE_OTHER:
2287                 return cm_acquire_id(mra_msg->remote_comm_id,
2288                                      mra_msg->local_comm_id);
2289         default:
2290                 return NULL;
2291         }
2292 }
2293
2294 static int cm_mra_handler(struct cm_work *work)
2295 {
2296         struct cm_id_private *cm_id_priv;
2297         struct cm_mra_msg *mra_msg;
2298         unsigned long flags;
2299         int timeout, ret;
2300
2301         mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
2302         cm_id_priv = cm_acquire_mraed_id(mra_msg);
2303         if (!cm_id_priv)
2304                 return -EINVAL;
2305
2306         work->cm_event.private_data = &mra_msg->private_data;
2307         work->cm_event.param.mra_rcvd.service_timeout =
2308                                         cm_mra_get_service_timeout(mra_msg);
2309         timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) +
2310                   cm_convert_to_ms(cm_id_priv->av.packet_life_time);
2311
2312         spin_lock_irqsave(&cm_id_priv->lock, flags);
2313         switch (cm_id_priv->id.state) {
2314         case IB_CM_REQ_SENT:
2315                 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ ||
2316                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
2317                                   cm_id_priv->msg, timeout))
2318                         goto out;
2319                 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
2320                 break;
2321         case IB_CM_REP_SENT:
2322                 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP ||
2323                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
2324                                   cm_id_priv->msg, timeout))
2325                         goto out;
2326                 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
2327                 break;
2328         case IB_CM_ESTABLISHED:
2329                 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER ||
2330                     cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
2331                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
2332                                   cm_id_priv->msg, timeout))
2333                         goto out;
2334                 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
2335                 break;
2336         default:
2337                 goto out;
2338         }
2339
2340         cm_id_priv->msg->context[1] = (void *) (unsigned long)
2341                                       cm_id_priv->id.state;
2342         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2343         if (!ret)
2344                 list_add_tail(&work->list, &cm_id_priv->work_list);
2345         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2346
2347         if (ret)
2348                 cm_process_work(cm_id_priv, work);
2349         else
2350                 cm_deref_id(cm_id_priv);
2351         return 0;
2352 out:
2353         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2354         cm_deref_id(cm_id_priv);
2355         return -EINVAL;
2356 }
2357
2358 static void cm_format_lap(struct cm_lap_msg *lap_msg,
2359                           struct cm_id_private *cm_id_priv,
2360                           struct ib_sa_path_rec *alternate_path,
2361                           const void *private_data,
2362                           u8 private_data_len)
2363 {
2364         cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID,
2365                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP));
2366         lap_msg->local_comm_id = cm_id_priv->id.local_id;
2367         lap_msg->remote_comm_id = cm_id_priv->id.remote_id;
2368         cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn);
2369         /* todo: need remote CM response timeout */
2370         cm_lap_set_remote_resp_timeout(lap_msg, 0x1F);
2371         lap_msg->alt_local_lid = alternate_path->slid;
2372         lap_msg->alt_remote_lid = alternate_path->dlid;
2373         lap_msg->alt_local_gid = alternate_path->sgid;
2374         lap_msg->alt_remote_gid = alternate_path->dgid;
2375         cm_lap_set_flow_label(lap_msg, alternate_path->flow_label);
2376         cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class);
2377         lap_msg->alt_hop_limit = alternate_path->hop_limit;
2378         cm_lap_set_packet_rate(lap_msg, alternate_path->rate);
2379         cm_lap_set_sl(lap_msg, alternate_path->sl);
2380         cm_lap_set_subnet_local(lap_msg, 1); /* local only... */
2381         cm_lap_set_local_ack_timeout(lap_msg,
2382                 min(31, alternate_path->packet_life_time + 1));
2383
2384         if (private_data && private_data_len)
2385                 memcpy(lap_msg->private_data, private_data, private_data_len);
2386 }
2387
2388 int ib_send_cm_lap(struct ib_cm_id *cm_id,
2389                    struct ib_sa_path_rec *alternate_path,
2390                    const void *private_data,
2391                    u8 private_data_len)
2392 {
2393         struct cm_id_private *cm_id_priv;
2394         struct ib_mad_send_buf *msg;
2395         unsigned long flags;
2396         int ret;
2397
2398         if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE)
2399                 return -EINVAL;
2400
2401         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2402         spin_lock_irqsave(&cm_id_priv->lock, flags);
2403         if (cm_id->state != IB_CM_ESTABLISHED ||
2404             cm_id->lap_state != IB_CM_LAP_IDLE) {
2405                 ret = -EINVAL;
2406                 goto out;
2407         }
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 ib_sa_path_rec *path,
2434                                     struct cm_lap_msg *lap_msg)
2435 {
2436         memset(path, 0, sizeof *path);
2437         path->dgid = lap_msg->alt_local_gid;
2438         path->sgid = lap_msg->alt_remote_gid;
2439         path->dlid = lap_msg->alt_local_lid;
2440         path->slid = lap_msg->alt_remote_lid;
2441         path->flow_label = cm_lap_get_flow_label(lap_msg);
2442         path->hop_limit = lap_msg->alt_hop_limit;
2443         path->traffic_class = cm_lap_get_traffic_class(lap_msg);
2444         path->reversible = 1;
2445         /* pkey is same as in REQ */
2446         path->sl = cm_lap_get_sl(lap_msg);
2447         path->mtu_selector = IB_SA_EQ;
2448         /* mtu is same as in REQ */
2449         path->rate_selector = IB_SA_EQ;
2450         path->rate = cm_lap_get_packet_rate(lap_msg);
2451         path->packet_life_time_selector = IB_SA_EQ;
2452         path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg);
2453         path->packet_life_time -= (path->packet_life_time > 0);
2454 }
2455
2456 static int cm_lap_handler(struct cm_work *work)
2457 {
2458         struct cm_id_private *cm_id_priv;
2459         struct cm_lap_msg *lap_msg;
2460         struct ib_cm_lap_event_param *param;
2461         struct ib_mad_send_buf *msg = NULL;
2462         unsigned long flags;
2463         int ret;
2464
2465         /* todo: verify LAP request and send reject APR if invalid. */
2466         lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
2467         cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id,
2468                                    lap_msg->local_comm_id);
2469         if (!cm_id_priv)
2470                 return -EINVAL;
2471
2472         param = &work->cm_event.param.lap_rcvd;
2473         param->alternate_path = &work->path[0];
2474         cm_format_path_from_lap(param->alternate_path, lap_msg);
2475         work->cm_event.private_data = &lap_msg->private_data;
2476
2477         spin_lock_irqsave(&cm_id_priv->lock, flags);
2478         if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
2479                 goto unlock;
2480
2481         switch (cm_id_priv->id.lap_state) {
2482         case IB_CM_LAP_IDLE:
2483                 break;
2484         case IB_CM_MRA_LAP_SENT:
2485                 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2486                         goto unlock;
2487
2488                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2489                               CM_MSG_RESPONSE_OTHER,
2490                               cm_id_priv->service_timeout,
2491                               cm_id_priv->private_data,
2492                               cm_id_priv->private_data_len);
2493                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2494
2495                 if (ib_post_send_mad(msg, NULL))
2496                         cm_free_msg(msg);
2497                 goto deref;
2498         default:
2499                 goto unlock;
2500         }
2501
2502         cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
2503         cm_id_priv->tid = lap_msg->hdr.tid;
2504         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2505         if (!ret)
2506                 list_add_tail(&work->list, &cm_id_priv->work_list);
2507         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2508
2509         if (ret)
2510                 cm_process_work(cm_id_priv, work);
2511         else
2512                 cm_deref_id(cm_id_priv);
2513         return 0;
2514
2515 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2516 deref:  cm_deref_id(cm_id_priv);
2517         return -EINVAL;
2518 }
2519
2520 static void cm_format_apr(struct cm_apr_msg *apr_msg,
2521                           struct cm_id_private *cm_id_priv,
2522                           enum ib_cm_apr_status status,
2523                           void *info,
2524                           u8 info_length,
2525                           const void *private_data,
2526                           u8 private_data_len)
2527 {
2528         cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid);
2529         apr_msg->local_comm_id = cm_id_priv->id.local_id;
2530         apr_msg->remote_comm_id = cm_id_priv->id.remote_id;
2531         apr_msg->ap_status = (u8) status;
2532
2533         if (info && info_length) {
2534                 apr_msg->info_length = info_length;
2535                 memcpy(apr_msg->info, info, info_length);
2536         }
2537
2538         if (private_data && private_data_len)
2539                 memcpy(apr_msg->private_data, private_data, private_data_len);
2540 }
2541
2542 int ib_send_cm_apr(struct ib_cm_id *cm_id,
2543                    enum ib_cm_apr_status status,
2544                    void *info,
2545                    u8 info_length,
2546                    const void *private_data,
2547                    u8 private_data_len)
2548 {
2549         struct cm_id_private *cm_id_priv;
2550         struct ib_mad_send_buf *msg;
2551         unsigned long flags;
2552         int ret;
2553
2554         if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) ||
2555             (info && info_length > IB_CM_APR_INFO_LENGTH))
2556                 return -EINVAL;
2557
2558         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2559         spin_lock_irqsave(&cm_id_priv->lock, flags);
2560         if (cm_id->state != IB_CM_ESTABLISHED ||
2561             (cm_id->lap_state != IB_CM_LAP_RCVD &&
2562              cm_id->lap_state != IB_CM_MRA_LAP_SENT)) {
2563                 ret = -EINVAL;
2564                 goto out;
2565         }
2566
2567         ret = cm_alloc_msg(cm_id_priv, &msg);
2568         if (ret)
2569                 goto out;
2570
2571         cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status,
2572                       info, info_length, private_data, private_data_len);
2573         ret = ib_post_send_mad(msg, NULL);
2574         if (ret) {
2575                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2576                 cm_free_msg(msg);
2577                 return ret;
2578         }
2579
2580         cm_id->lap_state = IB_CM_LAP_IDLE;
2581 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2582         return ret;
2583 }
2584 EXPORT_SYMBOL(ib_send_cm_apr);
2585
2586 static int cm_apr_handler(struct cm_work *work)
2587 {
2588         struct cm_id_private *cm_id_priv;
2589         struct cm_apr_msg *apr_msg;
2590         unsigned long flags;
2591         int ret;
2592
2593         apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
2594         cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id,
2595                                    apr_msg->local_comm_id);
2596         if (!cm_id_priv)
2597                 return -EINVAL; /* Unmatched reply. */
2598
2599         work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status;
2600         work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info;
2601         work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length;
2602         work->cm_event.private_data = &apr_msg->private_data;
2603
2604         spin_lock_irqsave(&cm_id_priv->lock, flags);
2605         if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
2606             (cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
2607              cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
2608                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2609                 goto out;
2610         }
2611         cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
2612         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2613         cm_id_priv->msg = NULL;
2614
2615         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2616         if (!ret)
2617                 list_add_tail(&work->list, &cm_id_priv->work_list);
2618         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2619
2620         if (ret)
2621                 cm_process_work(cm_id_priv, work);
2622         else
2623                 cm_deref_id(cm_id_priv);
2624         return 0;
2625 out:
2626         cm_deref_id(cm_id_priv);
2627         return -EINVAL;
2628 }
2629
2630 static int cm_timewait_handler(struct cm_work *work)
2631 {
2632         struct cm_timewait_info *timewait_info;
2633         struct cm_id_private *cm_id_priv;
2634         int ret;
2635
2636         timewait_info = (struct cm_timewait_info *)work;
2637         spin_lock_irq(&cm.lock);
2638         list_del(&timewait_info->list);
2639         spin_unlock_irq(&cm.lock);
2640
2641         cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
2642                                    timewait_info->work.remote_id);
2643         if (!cm_id_priv)
2644                 return -EINVAL;
2645
2646         spin_lock_irq(&cm_id_priv->lock);
2647         if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
2648             cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
2649                 spin_unlock_irq(&cm_id_priv->lock);
2650                 goto out;
2651         }
2652         cm_id_priv->id.state = IB_CM_IDLE;
2653         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2654         if (!ret)
2655                 list_add_tail(&work->list, &cm_id_priv->work_list);
2656         spin_unlock_irq(&cm_id_priv->lock);
2657
2658         if (ret)
2659                 cm_process_work(cm_id_priv, work);
2660         else
2661                 cm_deref_id(cm_id_priv);
2662         return 0;
2663 out:
2664         cm_deref_id(cm_id_priv);
2665         return -EINVAL;
2666 }
2667
2668 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
2669                                struct cm_id_private *cm_id_priv,
2670                                struct ib_cm_sidr_req_param *param)
2671 {
2672         cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
2673                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR));
2674         sidr_req_msg->request_id = cm_id_priv->id.local_id;
2675         sidr_req_msg->pkey = cpu_to_be16(param->path->pkey);
2676         sidr_req_msg->service_id = param->service_id;
2677
2678         if (param->private_data && param->private_data_len)
2679                 memcpy(sidr_req_msg->private_data, param->private_data,
2680                        param->private_data_len);
2681 }
2682
2683 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
2684                         struct ib_cm_sidr_req_param *param)
2685 {
2686         struct cm_id_private *cm_id_priv;
2687         struct ib_mad_send_buf *msg;
2688         unsigned long flags;
2689         int ret;
2690
2691         if (!param->path || (param->private_data &&
2692              param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
2693                 return -EINVAL;
2694
2695         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2696         ret = cm_init_av_by_path(param->path, &cm_id_priv->av);
2697         if (ret)
2698                 goto out;
2699
2700         cm_id->service_id = param->service_id;
2701         cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
2702         cm_id_priv->timeout_ms = param->timeout_ms;
2703         cm_id_priv->max_cm_retries = param->max_cm_retries;
2704         ret = cm_alloc_msg(cm_id_priv, &msg);
2705         if (ret)
2706                 goto out;
2707
2708         cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv,
2709                            param);
2710         msg->timeout_ms = cm_id_priv->timeout_ms;
2711         msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT;
2712
2713         spin_lock_irqsave(&cm_id_priv->lock, flags);
2714         if (cm_id->state == IB_CM_IDLE)
2715                 ret = ib_post_send_mad(msg, NULL);
2716         else
2717                 ret = -EINVAL;
2718
2719         if (ret) {
2720                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2721                 cm_free_msg(msg);
2722                 goto out;
2723         }
2724         cm_id->state = IB_CM_SIDR_REQ_SENT;
2725         cm_id_priv->msg = msg;
2726         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2727 out:
2728         return ret;
2729 }
2730 EXPORT_SYMBOL(ib_send_cm_sidr_req);
2731
2732 static void cm_format_sidr_req_event(struct cm_work *work,
2733                                      struct ib_cm_id *listen_id)
2734 {
2735         struct cm_sidr_req_msg *sidr_req_msg;
2736         struct ib_cm_sidr_req_event_param *param;
2737
2738         sidr_req_msg = (struct cm_sidr_req_msg *)
2739                                 work->mad_recv_wc->recv_buf.mad;
2740         param = &work->cm_event.param.sidr_req_rcvd;
2741         param->pkey = __be16_to_cpu(sidr_req_msg->pkey);
2742         param->listen_id = listen_id;
2743         param->port = work->port->port_num;
2744         work->cm_event.private_data = &sidr_req_msg->private_data;
2745 }
2746
2747 static int cm_sidr_req_handler(struct cm_work *work)
2748 {
2749         struct ib_cm_id *cm_id;
2750         struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
2751         struct cm_sidr_req_msg *sidr_req_msg;
2752         struct ib_wc *wc;
2753         unsigned long flags;
2754
2755         cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL);
2756         if (IS_ERR(cm_id))
2757                 return PTR_ERR(cm_id);
2758         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2759
2760         /* Record SGID/SLID and request ID for lookup. */
2761         sidr_req_msg = (struct cm_sidr_req_msg *)
2762                                 work->mad_recv_wc->recv_buf.mad;
2763         wc = work->mad_recv_wc->wc;
2764         cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid);
2765         cm_id_priv->av.dgid.global.interface_id = 0;
2766         cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2767                                 work->mad_recv_wc->recv_buf.grh,
2768                                 &cm_id_priv->av);
2769         cm_id_priv->id.remote_id = sidr_req_msg->request_id;
2770         cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
2771         cm_id_priv->tid = sidr_req_msg->hdr.tid;
2772         atomic_inc(&cm_id_priv->work_count);
2773
2774         spin_lock_irqsave(&cm.lock, flags);
2775         cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
2776         if (cur_cm_id_priv) {
2777                 spin_unlock_irqrestore(&cm.lock, flags);
2778                 goto out; /* Duplicate message. */
2779         }
2780         cur_cm_id_priv = cm_find_listen(cm_id->device,
2781                                         sidr_req_msg->service_id,
2782                                         sidr_req_msg->private_data);
2783         if (!cur_cm_id_priv) {
2784                 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
2785                 spin_unlock_irqrestore(&cm.lock, flags);
2786                 /* todo: reply with no match */
2787                 goto out; /* No match. */
2788         }
2789         atomic_inc(&cur_cm_id_priv->refcount);
2790         spin_unlock_irqrestore(&cm.lock, flags);
2791
2792         cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler;
2793         cm_id_priv->id.context = cur_cm_id_priv->id.context;
2794         cm_id_priv->id.service_id = sidr_req_msg->service_id;
2795         cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL);
2796
2797         cm_format_sidr_req_event(work, &cur_cm_id_priv->id);
2798         cm_process_work(cm_id_priv, work);
2799         cm_deref_id(cur_cm_id_priv);
2800         return 0;
2801 out:
2802         ib_destroy_cm_id(&cm_id_priv->id);
2803         return -EINVAL;
2804 }
2805
2806 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
2807                                struct cm_id_private *cm_id_priv,
2808                                struct ib_cm_sidr_rep_param *param)
2809 {
2810         cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
2811                           cm_id_priv->tid);
2812         sidr_rep_msg->request_id = cm_id_priv->id.remote_id;
2813         sidr_rep_msg->status = param->status;
2814         cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num));
2815         sidr_rep_msg->service_id = cm_id_priv->id.service_id;
2816         sidr_rep_msg->qkey = cpu_to_be32(param->qkey);
2817
2818         if (param->info && param->info_length)
2819                 memcpy(sidr_rep_msg->info, param->info, param->info_length);
2820
2821         if (param->private_data && param->private_data_len)
2822                 memcpy(sidr_rep_msg->private_data, param->private_data,
2823                        param->private_data_len);
2824 }
2825
2826 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
2827                         struct ib_cm_sidr_rep_param *param)
2828 {
2829         struct cm_id_private *cm_id_priv;
2830         struct ib_mad_send_buf *msg;
2831         unsigned long flags;
2832         int ret;
2833
2834         if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
2835             (param->private_data &&
2836              param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE))
2837                 return -EINVAL;
2838
2839         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2840         spin_lock_irqsave(&cm_id_priv->lock, flags);
2841         if (cm_id->state != IB_CM_SIDR_REQ_RCVD) {
2842                 ret = -EINVAL;
2843                 goto error;
2844         }
2845
2846         ret = cm_alloc_msg(cm_id_priv, &msg);
2847         if (ret)
2848                 goto error;
2849
2850         cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
2851                            param);
2852         ret = ib_post_send_mad(msg, NULL);
2853         if (ret) {
2854                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2855                 cm_free_msg(msg);
2856                 return ret;
2857         }
2858         cm_id->state = IB_CM_IDLE;
2859         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2860
2861         spin_lock_irqsave(&cm.lock, flags);
2862         rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
2863         spin_unlock_irqrestore(&cm.lock, flags);
2864         return 0;
2865
2866 error:  spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2867         return ret;
2868 }
2869 EXPORT_SYMBOL(ib_send_cm_sidr_rep);
2870
2871 static void cm_format_sidr_rep_event(struct cm_work *work)
2872 {
2873         struct cm_sidr_rep_msg *sidr_rep_msg;
2874         struct ib_cm_sidr_rep_event_param *param;
2875
2876         sidr_rep_msg = (struct cm_sidr_rep_msg *)
2877                                 work->mad_recv_wc->recv_buf.mad;
2878         param = &work->cm_event.param.sidr_rep_rcvd;
2879         param->status = sidr_rep_msg->status;
2880         param->qkey = be32_to_cpu(sidr_rep_msg->qkey);
2881         param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg));
2882         param->info = &sidr_rep_msg->info;
2883         param->info_len = sidr_rep_msg->info_length;
2884         work->cm_event.private_data = &sidr_rep_msg->private_data;
2885 }
2886
2887 static int cm_sidr_rep_handler(struct cm_work *work)
2888 {
2889         struct cm_sidr_rep_msg *sidr_rep_msg;
2890         struct cm_id_private *cm_id_priv;
2891         unsigned long flags;
2892
2893         sidr_rep_msg = (struct cm_sidr_rep_msg *)
2894                                 work->mad_recv_wc->recv_buf.mad;
2895         cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0);
2896         if (!cm_id_priv)
2897                 return -EINVAL; /* Unmatched reply. */
2898
2899         spin_lock_irqsave(&cm_id_priv->lock, flags);
2900         if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
2901                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2902                 goto out;
2903         }
2904         cm_id_priv->id.state = IB_CM_IDLE;
2905         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2906         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2907
2908         cm_format_sidr_rep_event(work);
2909         cm_process_work(cm_id_priv, work);
2910         return 0;
2911 out:
2912         cm_deref_id(cm_id_priv);
2913         return -EINVAL;
2914 }
2915
2916 static void cm_process_send_error(struct ib_mad_send_buf *msg,
2917                                   enum ib_wc_status wc_status)
2918 {
2919         struct cm_id_private *cm_id_priv;
2920         struct ib_cm_event cm_event;
2921         enum ib_cm_state state;
2922         unsigned long flags;
2923         int ret;
2924
2925         memset(&cm_event, 0, sizeof cm_event);
2926         cm_id_priv = msg->context[0];
2927
2928         /* Discard old sends or ones without a response. */
2929         spin_lock_irqsave(&cm_id_priv->lock, flags);
2930         state = (enum ib_cm_state) (unsigned long) msg->context[1];
2931         if (msg != cm_id_priv->msg || state != cm_id_priv->id.state)
2932                 goto discard;
2933
2934         switch (state) {
2935         case IB_CM_REQ_SENT:
2936         case IB_CM_MRA_REQ_RCVD:
2937                 cm_reset_to_idle(cm_id_priv);
2938                 cm_event.event = IB_CM_REQ_ERROR;
2939                 break;
2940         case IB_CM_REP_SENT:
2941         case IB_CM_MRA_REP_RCVD:
2942                 cm_reset_to_idle(cm_id_priv);
2943                 cm_event.event = IB_CM_REP_ERROR;
2944                 break;
2945         case IB_CM_DREQ_SENT:
2946                 cm_enter_timewait(cm_id_priv);
2947                 cm_event.event = IB_CM_DREQ_ERROR;
2948                 break;
2949         case IB_CM_SIDR_REQ_SENT:
2950                 cm_id_priv->id.state = IB_CM_IDLE;
2951                 cm_event.event = IB_CM_SIDR_REQ_ERROR;
2952                 break;
2953         default:
2954                 goto discard;
2955         }
2956         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2957         cm_event.param.send_status = wc_status;
2958
2959         /* No other events can occur on the cm_id at this point. */
2960         ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
2961         cm_free_msg(msg);
2962         if (ret)
2963                 ib_destroy_cm_id(&cm_id_priv->id);
2964         return;
2965 discard:
2966         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2967         cm_free_msg(msg);
2968 }
2969
2970 static void cm_send_handler(struct ib_mad_agent *mad_agent,
2971                             struct ib_mad_send_wc *mad_send_wc)
2972 {
2973         struct ib_mad_send_buf *msg = mad_send_wc->send_buf;
2974
2975         switch (mad_send_wc->status) {
2976         case IB_WC_SUCCESS:
2977         case IB_WC_WR_FLUSH_ERR:
2978                 cm_free_msg(msg);
2979                 break;
2980         default:
2981                 if (msg->context[0] && msg->context[1])
2982                         cm_process_send_error(msg, mad_send_wc->status);
2983                 else
2984                         cm_free_msg(msg);
2985                 break;
2986         }
2987 }
2988
2989 static void cm_work_handler(void *data)
2990 {
2991         struct cm_work *work = data;
2992         int ret;
2993
2994         switch (work->cm_event.event) {
2995         case IB_CM_REQ_RECEIVED:
2996                 ret = cm_req_handler(work);
2997                 break;
2998         case IB_CM_MRA_RECEIVED:
2999                 ret = cm_mra_handler(work);
3000                 break;
3001         case IB_CM_REJ_RECEIVED:
3002                 ret = cm_rej_handler(work);
3003                 break;
3004         case IB_CM_REP_RECEIVED:
3005                 ret = cm_rep_handler(work);
3006                 break;
3007         case IB_CM_RTU_RECEIVED:
3008                 ret = cm_rtu_handler(work);
3009                 break;
3010         case IB_CM_USER_ESTABLISHED:
3011                 ret = cm_establish_handler(work);
3012                 break;
3013         case IB_CM_DREQ_RECEIVED:
3014                 ret = cm_dreq_handler(work);
3015                 break;
3016         case IB_CM_DREP_RECEIVED:
3017                 ret = cm_drep_handler(work);
3018                 break;
3019         case IB_CM_SIDR_REQ_RECEIVED:
3020                 ret = cm_sidr_req_handler(work);
3021                 break;
3022         case IB_CM_SIDR_REP_RECEIVED:
3023                 ret = cm_sidr_rep_handler(work);
3024                 break;
3025         case IB_CM_LAP_RECEIVED:
3026                 ret = cm_lap_handler(work);
3027                 break;
3028         case IB_CM_APR_RECEIVED:
3029                 ret = cm_apr_handler(work);
3030                 break;
3031         case IB_CM_TIMEWAIT_EXIT:
3032                 ret = cm_timewait_handler(work);
3033                 break;
3034         default:
3035                 ret = -EINVAL;
3036                 break;
3037         }
3038         if (ret)
3039                 cm_free_work(work);
3040 }
3041
3042 int ib_cm_establish(struct ib_cm_id *cm_id)
3043 {
3044         struct cm_id_private *cm_id_priv;
3045         struct cm_work *work;
3046         unsigned long flags;
3047         int ret = 0;
3048
3049         work = kmalloc(sizeof *work, GFP_ATOMIC);
3050         if (!work)
3051                 return -ENOMEM;
3052
3053         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3054         spin_lock_irqsave(&cm_id_priv->lock, flags);
3055         switch (cm_id->state)
3056         {
3057         case IB_CM_REP_SENT:
3058         case IB_CM_MRA_REP_RCVD:
3059                 cm_id->state = IB_CM_ESTABLISHED;
3060                 break;
3061         case IB_CM_ESTABLISHED:
3062                 ret = -EISCONN;
3063                 break;
3064         default:
3065                 ret = -EINVAL;
3066                 break;
3067         }
3068         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3069
3070         if (ret) {
3071                 kfree(work);
3072                 goto out;
3073         }
3074
3075         /*
3076          * The CM worker thread may try to destroy the cm_id before it
3077          * can execute this work item.  To prevent potential deadlock,
3078          * we need to find the cm_id once we're in the context of the
3079          * worker thread, rather than holding a reference on it.
3080          */
3081         INIT_WORK(&work->work, cm_work_handler, work);
3082         work->local_id = cm_id->local_id;
3083         work->remote_id = cm_id->remote_id;
3084         work->mad_recv_wc = NULL;
3085         work->cm_event.event = IB_CM_USER_ESTABLISHED;
3086         queue_work(cm.wq, &work->work);
3087 out:
3088         return ret;
3089 }
3090 EXPORT_SYMBOL(ib_cm_establish);
3091
3092 static void cm_recv_handler(struct ib_mad_agent *mad_agent,
3093                             struct ib_mad_recv_wc *mad_recv_wc)
3094 {
3095         struct cm_work *work;
3096         enum ib_cm_event_type event;
3097         int paths = 0;
3098
3099         switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
3100         case CM_REQ_ATTR_ID:
3101                 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)->
3102                                                     alt_local_lid != 0);
3103                 event = IB_CM_REQ_RECEIVED;
3104                 break;
3105         case CM_MRA_ATTR_ID:
3106                 event = IB_CM_MRA_RECEIVED;
3107                 break;
3108         case CM_REJ_ATTR_ID:
3109                 event = IB_CM_REJ_RECEIVED;
3110                 break;
3111         case CM_REP_ATTR_ID:
3112                 event = IB_CM_REP_RECEIVED;
3113                 break;
3114         case CM_RTU_ATTR_ID:
3115                 event = IB_CM_RTU_RECEIVED;
3116                 break;
3117         case CM_DREQ_ATTR_ID:
3118                 event = IB_CM_DREQ_RECEIVED;
3119                 break;
3120         case CM_DREP_ATTR_ID:
3121                 event = IB_CM_DREP_RECEIVED;
3122                 break;
3123         case CM_SIDR_REQ_ATTR_ID:
3124                 event = IB_CM_SIDR_REQ_RECEIVED;
3125                 break;
3126         case CM_SIDR_REP_ATTR_ID:
3127                 event = IB_CM_SIDR_REP_RECEIVED;
3128                 break;
3129         case CM_LAP_ATTR_ID:
3130                 paths = 1;
3131                 event = IB_CM_LAP_RECEIVED;
3132                 break;
3133         case CM_APR_ATTR_ID:
3134                 event = IB_CM_APR_RECEIVED;
3135                 break;
3136         default:
3137                 ib_free_recv_mad(mad_recv_wc);
3138                 return;
3139         }
3140
3141         work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths,
3142                        GFP_KERNEL);
3143         if (!work) {
3144                 ib_free_recv_mad(mad_recv_wc);
3145                 return;
3146         }
3147
3148         INIT_WORK(&work->work, cm_work_handler, work);
3149         work->cm_event.event = event;
3150         work->mad_recv_wc = mad_recv_wc;
3151         work->port = (struct cm_port *)mad_agent->context;
3152         queue_work(cm.wq, &work->work);
3153 }
3154
3155 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
3156                                 struct ib_qp_attr *qp_attr,
3157                                 int *qp_attr_mask)
3158 {
3159         unsigned long flags;
3160         int ret;
3161
3162         spin_lock_irqsave(&cm_id_priv->lock, flags);
3163         switch (cm_id_priv->id.state) {
3164         case IB_CM_REQ_SENT:
3165         case IB_CM_MRA_REQ_RCVD:
3166         case IB_CM_REQ_RCVD:
3167         case IB_CM_MRA_REQ_SENT:
3168         case IB_CM_REP_RCVD:
3169         case IB_CM_MRA_REP_SENT:
3170         case IB_CM_REP_SENT:
3171         case IB_CM_MRA_REP_RCVD:
3172         case IB_CM_ESTABLISHED:
3173                 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
3174                                 IB_QP_PKEY_INDEX | IB_QP_PORT;
3175                 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE;
3176                 if (cm_id_priv->responder_resources)
3177                         qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ |
3178                                                     IB_ACCESS_REMOTE_ATOMIC;
3179                 qp_attr->pkey_index = cm_id_priv->av.pkey_index;
3180                 qp_attr->port_num = cm_id_priv->av.port->port_num;
3181                 ret = 0;
3182                 break;
3183         default:
3184                 ret = -EINVAL;
3185                 break;
3186         }
3187         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3188         return ret;
3189 }
3190
3191 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
3192                                struct ib_qp_attr *qp_attr,
3193                                int *qp_attr_mask)
3194 {
3195         unsigned long flags;
3196         int ret;
3197
3198         spin_lock_irqsave(&cm_id_priv->lock, flags);
3199         switch (cm_id_priv->id.state) {
3200         case IB_CM_REQ_RCVD:
3201         case IB_CM_MRA_REQ_SENT:
3202         case IB_CM_REP_RCVD:
3203         case IB_CM_MRA_REP_SENT:
3204         case IB_CM_REP_SENT:
3205         case IB_CM_MRA_REP_RCVD:
3206         case IB_CM_ESTABLISHED:
3207                 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
3208                                 IB_QP_DEST_QPN | IB_QP_RQ_PSN;
3209                 qp_attr->ah_attr = cm_id_priv->av.ah_attr;
3210                 qp_attr->path_mtu = cm_id_priv->path_mtu;
3211                 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
3212                 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
3213                 if (cm_id_priv->qp_type == IB_QPT_RC) {
3214                         *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC |
3215                                          IB_QP_MIN_RNR_TIMER;
3216                         qp_attr->max_dest_rd_atomic =
3217                                         cm_id_priv->responder_resources;
3218                         qp_attr->min_rnr_timer = 0;
3219                 }
3220                 if (cm_id_priv->alt_av.ah_attr.dlid) {
3221                         *qp_attr_mask |= IB_QP_ALT_PATH;
3222                         qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
3223                         qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3224                 }
3225                 ret = 0;
3226                 break;
3227         default:
3228                 ret = -EINVAL;
3229                 break;
3230         }
3231         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3232         return ret;
3233 }
3234
3235 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv,
3236                                struct ib_qp_attr *qp_attr,
3237                                int *qp_attr_mask)
3238 {
3239         unsigned long flags;
3240         int ret;
3241
3242         spin_lock_irqsave(&cm_id_priv->lock, flags);
3243         switch (cm_id_priv->id.state) {
3244         case IB_CM_REP_RCVD:
3245         case IB_CM_MRA_REP_SENT:
3246         case IB_CM_REP_SENT:
3247         case IB_CM_MRA_REP_RCVD:
3248         case IB_CM_ESTABLISHED:
3249                 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN;
3250                 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn);
3251                 if (cm_id_priv->qp_type == IB_QPT_RC) {
3252                         *qp_attr_mask |= IB_QP_TIMEOUT | IB_QP_RETRY_CNT |
3253                                          IB_QP_RNR_RETRY |
3254                                          IB_QP_MAX_QP_RD_ATOMIC;
3255                         qp_attr->timeout = cm_id_priv->local_ack_timeout;
3256                         qp_attr->retry_cnt = cm_id_priv->retry_count;
3257                         qp_attr->rnr_retry = cm_id_priv->rnr_retry_count;
3258                         qp_attr->max_rd_atomic = cm_id_priv->initiator_depth;
3259                 }
3260                 if (cm_id_priv->alt_av.ah_attr.dlid) {
3261                         *qp_attr_mask |= IB_QP_PATH_MIG_STATE;
3262                         qp_attr->path_mig_state = IB_MIG_REARM;
3263                 }
3264                 ret = 0;
3265                 break;
3266         default:
3267                 ret = -EINVAL;
3268                 break;
3269         }
3270         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3271         return ret;
3272 }
3273
3274 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
3275                        struct ib_qp_attr *qp_attr,
3276                        int *qp_attr_mask)
3277 {
3278         struct cm_id_private *cm_id_priv;
3279         int ret;
3280
3281         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3282         switch (qp_attr->qp_state) {
3283         case IB_QPS_INIT:
3284                 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask);
3285                 break;
3286         case IB_QPS_RTR:
3287                 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask);
3288                 break;
3289         case IB_QPS_RTS:
3290                 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask);
3291                 break;
3292         default:
3293                 ret = -EINVAL;
3294                 break;
3295         }
3296         return ret;
3297 }
3298 EXPORT_SYMBOL(ib_cm_init_qp_attr);
3299
3300 static void cm_add_one(struct ib_device *device)
3301 {
3302         struct cm_device *cm_dev;
3303         struct cm_port *port;
3304         struct ib_mad_reg_req reg_req = {
3305                 .mgmt_class = IB_MGMT_CLASS_CM,
3306                 .mgmt_class_version = IB_CM_CLASS_VERSION
3307         };
3308         struct ib_port_modify port_modify = {
3309                 .set_port_cap_mask = IB_PORT_CM_SUP
3310         };
3311         unsigned long flags;
3312         int ret;
3313         u8 i;
3314
3315         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
3316                 return;
3317
3318         cm_dev = kmalloc(sizeof(*cm_dev) + sizeof(*port) *
3319                          device->phys_port_cnt, GFP_KERNEL);
3320         if (!cm_dev)
3321                 return;
3322
3323         cm_dev->device = device;
3324         cm_dev->ca_guid = device->node_guid;
3325
3326         set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
3327         for (i = 1; i <= device->phys_port_cnt; i++) {
3328                 port = &cm_dev->port[i-1];
3329                 port->cm_dev = cm_dev;
3330                 port->port_num = i;
3331                 port->mad_agent = ib_register_mad_agent(device, i,
3332                                                         IB_QPT_GSI,
3333                                                         &reg_req,
3334                                                         0,
3335                                                         cm_send_handler,
3336                                                         cm_recv_handler,
3337                                                         port);
3338                 if (IS_ERR(port->mad_agent))
3339                         goto error1;
3340
3341                 ret = ib_modify_port(device, i, 0, &port_modify);
3342                 if (ret)
3343                         goto error2;
3344         }
3345         ib_set_client_data(device, &cm_client, cm_dev);
3346
3347         write_lock_irqsave(&cm.device_lock, flags);
3348         list_add_tail(&cm_dev->list, &cm.device_list);
3349         write_unlock_irqrestore(&cm.device_lock, flags);
3350         return;
3351
3352 error2:
3353         ib_unregister_mad_agent(port->mad_agent);
3354 error1:
3355         port_modify.set_port_cap_mask = 0;
3356         port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
3357         while (--i) {
3358                 port = &cm_dev->port[i-1];
3359                 ib_modify_port(device, port->port_num, 0, &port_modify);
3360                 ib_unregister_mad_agent(port->mad_agent);
3361         }
3362         kfree(cm_dev);
3363 }
3364
3365 static void cm_remove_one(struct ib_device *device)
3366 {
3367         struct cm_device *cm_dev;
3368         struct cm_port *port;
3369         struct ib_port_modify port_modify = {
3370                 .clr_port_cap_mask = IB_PORT_CM_SUP
3371         };
3372         unsigned long flags;
3373         int i;
3374
3375         cm_dev = ib_get_client_data(device, &cm_client);
3376         if (!cm_dev)
3377                 return;
3378
3379         write_lock_irqsave(&cm.device_lock, flags);
3380         list_del(&cm_dev->list);
3381         write_unlock_irqrestore(&cm.device_lock, flags);
3382
3383         for (i = 1; i <= device->phys_port_cnt; i++) {
3384                 port = &cm_dev->port[i-1];
3385                 ib_modify_port(device, port->port_num, 0, &port_modify);
3386                 ib_unregister_mad_agent(port->mad_agent);
3387         }
3388         kfree(cm_dev);
3389 }
3390
3391 static int __init ib_cm_init(void)
3392 {
3393         int ret;
3394
3395         memset(&cm, 0, sizeof cm);
3396         INIT_LIST_HEAD(&cm.device_list);
3397         rwlock_init(&cm.device_lock);
3398         spin_lock_init(&cm.lock);
3399         cm.listen_service_table = RB_ROOT;
3400         cm.listen_service_id = __constant_be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID);
3401         cm.remote_id_table = RB_ROOT;
3402         cm.remote_qp_table = RB_ROOT;
3403         cm.remote_sidr_table = RB_ROOT;
3404         idr_init(&cm.local_id_table);
3405         get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand);
3406         idr_pre_get(&cm.local_id_table, GFP_KERNEL);
3407         INIT_LIST_HEAD(&cm.timewait_list);
3408
3409         cm.wq = create_workqueue("ib_cm");
3410         if (!cm.wq)
3411                 return -ENOMEM;
3412
3413         ret = ib_register_client(&cm_client);
3414         if (ret)
3415                 goto error;
3416
3417         return 0;
3418 error:
3419         destroy_workqueue(cm.wq);
3420         return ret;
3421 }
3422
3423 static void __exit ib_cm_cleanup(void)
3424 {
3425         struct cm_timewait_info *timewait_info, *tmp;
3426
3427         spin_lock_irq(&cm.lock);
3428         list_for_each_entry(timewait_info, &cm.timewait_list, list)
3429                 cancel_delayed_work(&timewait_info->work.work);
3430         spin_unlock_irq(&cm.lock);
3431
3432         destroy_workqueue(cm.wq);
3433
3434         list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) {
3435                 list_del(&timewait_info->list);
3436                 kfree(timewait_info);
3437         }
3438
3439         ib_unregister_client(&cm_client);
3440         idr_destroy(&cm.local_id_table);
3441 }
3442
3443 module_init(ib_cm_init);
3444 module_exit(ib_cm_cleanup);
3445