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 = kmalloc(private_data_len, GFP_KERNEL);
 244         if (!data)
 245                 return ERR_PTR(-ENOMEM);
 246
 247         memcpy(data, private_data, private_data_len);
 248         return data;
 249 }
 250
 251 static void cm_set_private_data(struct cm_id_private *cm_id_priv,
 252                                  void *private_data, u8 private_data_len)
 253 {
 254         if (cm_id_priv->private_data && cm_id_priv->private_data_len)
 255                 kfree(cm_id_priv->private_data);
 256
 257         cm_id_priv->private_data = private_data;
 258         cm_id_priv->private_data_len = private_data_len;
 259 }
 260
 261 static void cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc,
 262                                     struct ib_grh *grh, struct cm_av *av)
 263 {
 264         av->port = port;
 265         av->pkey_index = wc->pkey_index;
 266         ib_init_ah_from_wc(port->cm_dev->device, port->port_num, wc,
 267                            grh, &av->ah_attr);
 268 }
 269
 270 static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av)
 271 {
 272         struct cm_device *cm_dev;
 273         struct cm_port *port = NULL;
 274         unsigned long flags;
 275         int ret;
 276         u8 p;
 277
 278         read_lock_irqsave(&cm.device_lock, flags);
 279         list_for_each_entry(cm_dev, &cm.device_list, list) {
 280                 if (!ib_find_cached_gid(cm_dev->device, &path->sgid,
 281                                         &p, NULL)) {
 282                         port = &cm_dev->port[p-1];
 283                         break;
 284                 }
 285         }
 286         read_unlock_irqrestore(&cm.device_lock, flags);
 287
 288         if (!port)
 289                 return -EINVAL;
 290
 291         ret = ib_find_cached_pkey(cm_dev->device, port->port_num,
 292                                   be16_to_cpu(path->pkey), &av->pkey_index);
 293         if (ret)
 294                 return ret;
 295
 296         av->port = port;
 297         ib_init_ah_from_path(cm_dev->device, port->port_num, path,
 298                              &av->ah_attr);
 299         av->packet_life_time = path->packet_life_time;
 300         return 0;
 301 }
 302
 303 static int cm_alloc_id(struct cm_id_private *cm_id_priv)
 304 {
 305         unsigned long flags;
 306         int ret, id;
 307         static int next_id;
 308
 309         do {
 310                 spin_lock_irqsave(&cm.lock, flags);
 311                 ret = idr_get_new_above(&cm.local_id_table, cm_id_priv,
 312                                         next_id++, &id);
 313                 spin_unlock_irqrestore(&cm.lock, flags);
 314         } while( (ret == -EAGAIN) && idr_pre_get(&cm.local_id_table, GFP_KERNEL) );
 315
 316         cm_id_priv->id.local_id = (__force __be32) (id ^ cm.random_id_operand);
 317         return ret;
 318 }
 319
 320 static void cm_free_id(__be32 local_id)
 321 {
 322         unsigned long flags;
 323
 324         spin_lock_irqsave(&cm.lock, flags);
 325         idr_remove(&cm.local_id_table,
 326                    (__force int) (local_id ^ cm.random_id_operand));
 327         spin_unlock_irqrestore(&cm.lock, flags);
 328 }
 329
 330 static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id)
 331 {
 332         struct cm_id_private *cm_id_priv;
 333
 334         cm_id_priv = idr_find(&cm.local_id_table,
 335                               (__force int) (local_id ^ cm.random_id_operand));
 336         if (cm_id_priv) {
 337                 if (cm_id_priv->id.remote_id == remote_id)
 338                         atomic_inc(&cm_id_priv->refcount);
 339                 else
 340                         cm_id_priv = NULL;
 341         }
 342
 343         return cm_id_priv;
 344 }
 345
 346 static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id)
 347 {
 348         struct cm_id_private *cm_id_priv;
 349         unsigned long flags;
 350
 351         spin_lock_irqsave(&cm.lock, flags);
 352         cm_id_priv = cm_get_id(local_id, remote_id);
 353         spin_unlock_irqrestore(&cm.lock, flags);
 354
 355         return cm_id_priv;
 356 }
 357
 358 static void cm_mask_copy(u8 *dst, u8 *src, u8 *mask)
 359 {
 360         int i;
 361
 362         for (i = 0; i < IB_CM_COMPARE_SIZE / sizeof(unsigned long); i++)
 363                 ((unsigned long *) dst)[i] = ((unsigned long *) src)[i] &
 364                                              ((unsigned long *) mask)[i];
 365 }
 366
 367 static int cm_compare_data(struct ib_cm_compare_data *src_data,
 368                            struct ib_cm_compare_data *dst_data)
 369 {
 370         u8 src[IB_CM_COMPARE_SIZE];
 371         u8 dst[IB_CM_COMPARE_SIZE];
 372
 373         if (!src_data || !dst_data)
 374                 return 0;
 375
 376         cm_mask_copy(src, src_data->data, dst_data->mask);
 377         cm_mask_copy(dst, dst_data->data, src_data->mask);
 378         return memcmp(src, dst, IB_CM_COMPARE_SIZE);
 379 }
 380
 381 static int cm_compare_private_data(u8 *private_data,
 382                                    struct ib_cm_compare_data *dst_data)
 383 {
 384         u8 src[IB_CM_COMPARE_SIZE];
 385
 386         if (!dst_data)
 387                 return 0;
 388
 389         cm_mask_copy(src, private_data, dst_data->mask);
 390         return memcmp(src, dst_data->data, IB_CM_COMPARE_SIZE);
 391 }
 392
 393 static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv)
 394 {
 395         struct rb_node **link = &cm.listen_service_table.rb_node;
 396         struct rb_node *parent = NULL;
 397         struct cm_id_private *cur_cm_id_priv;
 398         __be64 service_id = cm_id_priv->id.service_id;
 399         __be64 service_mask = cm_id_priv->id.service_mask;
 400         int data_cmp;
 401
 402         while (*link) {
 403                 parent = *link;
 404                 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
 405                                           service_node);
 406                 data_cmp = cm_compare_data(cm_id_priv->compare_data,
 407                                            cur_cm_id_priv->compare_data);
 408                 if ((cur_cm_id_priv->id.service_mask & service_id) ==
 409                     (service_mask & cur_cm_id_priv->id.service_id) &&
 410                     (cm_id_priv->id.device == cur_cm_id_priv->id.device) &&
 411                     !data_cmp)
 412                         return cur_cm_id_priv;
 413
 414                 if (cm_id_priv->id.device < cur_cm_id_priv->id.device)
 415                         link = &(*link)->rb_left;
 416                 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device)
 417                         link = &(*link)->rb_right;
 418                 else if (service_id < cur_cm_id_priv->id.service_id)
 419                         link = &(*link)->rb_left;
 420                 else if (service_id > cur_cm_id_priv->id.service_id)
 421                         link = &(*link)->rb_right;
 422                 else if (data_cmp < 0)
 423                         link = &(*link)->rb_left;
 424                 else
 425                         link = &(*link)->rb_right;
 426         }
 427         rb_link_node(&cm_id_priv->service_node, parent, link);
 428         rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table);
 429         return NULL;
 430 }
 431
 432 static struct cm_id_private * cm_find_listen(struct ib_device *device,
 433                                              __be64 service_id,
 434                                              u8 *private_data)
 435 {
 436         struct rb_node *node = cm.listen_service_table.rb_node;
 437         struct cm_id_private *cm_id_priv;
 438         int data_cmp;
 439
 440         while (node) {
 441                 cm_id_priv = rb_entry(node, struct cm_id_private, service_node);
 442                 data_cmp = cm_compare_private_data(private_data,
 443                                                    cm_id_priv->compare_data);
 444                 if ((cm_id_priv->id.service_mask & service_id) ==
 445                      cm_id_priv->id.service_id &&
 446                     (cm_id_priv->id.device == device) && !data_cmp)
 447                         return cm_id_priv;
 448
 449                 if (device < cm_id_priv->id.device)
 450                         node = node->rb_left;
 451                 else if (device > cm_id_priv->id.device)
 452                         node = node->rb_right;
 453                 else if (service_id < cm_id_priv->id.service_id)
 454                         node = node->rb_left;
 455                 else if (service_id > cm_id_priv->id.service_id)
 456                         node = node->rb_right;
 457                 else if (data_cmp < 0)
 458                         node = node->rb_left;
 459                 else
 460                         node = node->rb_right;
 461         }
 462         return NULL;
 463 }
 464
 465 static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info
 466                                                      *timewait_info)
 467 {
 468         struct rb_node **link = &cm.remote_id_table.rb_node;
 469         struct rb_node *parent = NULL;
 470         struct cm_timewait_info *cur_timewait_info;
 471         __be64 remote_ca_guid = timewait_info->remote_ca_guid;
 472         __be32 remote_id = timewait_info->work.remote_id;
 473
 474         while (*link) {
 475                 parent = *link;
 476                 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
 477                                              remote_id_node);
 478                 if (remote_id < cur_timewait_info->work.remote_id)
 479                         link = &(*link)->rb_left;
 480                 else if (remote_id > cur_timewait_info->work.remote_id)
 481                         link = &(*link)->rb_right;
 482                 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid)
 483                         link = &(*link)->rb_left;
 484                 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid)
 485                         link = &(*link)->rb_right;
 486                 else
 487                         return cur_timewait_info;
 488         }
 489         timewait_info->inserted_remote_id = 1;
 490         rb_link_node(&timewait_info->remote_id_node, parent, link);
 491         rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table);
 492         return NULL;
 493 }
 494
 495 static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid,
 496                                                    __be32 remote_id)
 497 {
 498         struct rb_node *node = cm.remote_id_table.rb_node;
 499         struct cm_timewait_info *timewait_info;
 500
 501         while (node) {
 502                 timewait_info = rb_entry(node, struct cm_timewait_info,
 503                                          remote_id_node);
 504                 if (remote_id < timewait_info->work.remote_id)
 505                         node = node->rb_left;
 506                 else if (remote_id > timewait_info->work.remote_id)
 507                         node = node->rb_right;
 508                 else if (remote_ca_guid < timewait_info->remote_ca_guid)
 509                         node = node->rb_left;
 510                 else if (remote_ca_guid > timewait_info->remote_ca_guid)
 511                         node = node->rb_right;
 512                 else
 513                         return timewait_info;
 514         }
 515         return NULL;
 516 }
 517
 518 static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info
 519                                                       *timewait_info)
 520 {
 521         struct rb_node **link = &cm.remote_qp_table.rb_node;
 522         struct rb_node *parent = NULL;
 523         struct cm_timewait_info *cur_timewait_info;
 524         __be64 remote_ca_guid = timewait_info->remote_ca_guid;
 525         __be32 remote_qpn = timewait_info->remote_qpn;
 526
 527         while (*link) {
 528                 parent = *link;
 529                 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
 530                                              remote_qp_node);
 531                 if (remote_qpn < cur_timewait_info->remote_qpn)
 532                         link = &(*link)->rb_left;
 533                 else if (remote_qpn > cur_timewait_info->remote_qpn)
 534                         link = &(*link)->rb_right;
 535                 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid)
 536                         link = &(*link)->rb_left;
 537                 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid)
 538                         link = &(*link)->rb_right;
 539                 else
 540                         return cur_timewait_info;
 541         }
 542         timewait_info->inserted_remote_qp = 1;
 543         rb_link_node(&timewait_info->remote_qp_node, parent, link);
 544         rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table);
 545         return NULL;
 546 }
 547
 548 static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private
 549                                                     *cm_id_priv)
 550 {
 551         struct rb_node **link = &cm.remote_sidr_table.rb_node;
 552         struct rb_node *parent = NULL;
 553         struct cm_id_private *cur_cm_id_priv;
 554         union ib_gid *port_gid = &cm_id_priv->av.dgid;
 555         __be32 remote_id = cm_id_priv->id.remote_id;
 556
 557         while (*link) {
 558                 parent = *link;
 559                 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
 560                                           sidr_id_node);
 561                 if (remote_id < cur_cm_id_priv->id.remote_id)
 562                         link = &(*link)->rb_left;
 563                 else if (remote_id > cur_cm_id_priv->id.remote_id)
 564                         link = &(*link)->rb_right;
 565                 else {
 566                         int cmp;
 567                         cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid,
 568                                      sizeof *port_gid);
 569                         if (cmp < 0)
 570                                 link = &(*link)->rb_left;
 571                         else if (cmp > 0)
 572                                 link = &(*link)->rb_right;
 573                         else
 574                                 return cur_cm_id_priv;
 575                 }
 576         }
 577         rb_link_node(&cm_id_priv->sidr_id_node, parent, link);
 578         rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
 579         return NULL;
 580 }
 581
 582 static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv,
 583                                enum ib_cm_sidr_status status)
 584 {
 585         struct ib_cm_sidr_rep_param param;
 586
 587         memset(&param, 0, sizeof param);
 588         param.status = status;
 589         ib_send_cm_sidr_rep(&cm_id_priv->id, &param);
 590 }
 591
 592 struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
 593                                  ib_cm_handler cm_handler,
 594                                  void *context)
 595 {
 596         struct cm_id_private *cm_id_priv;
 597         int ret;
 598
 599         cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL);
 600         if (!cm_id_priv)
 601                 return ERR_PTR(-ENOMEM);
 602
 603         cm_id_priv->id.state = IB_CM_IDLE;
 604         cm_id_priv->id.device = device;
 605         cm_id_priv->id.cm_handler = cm_handler;
 606         cm_id_priv->id.context = context;
 607         cm_id_priv->id.remote_cm_qpn = 1;
 608         ret = cm_alloc_id(cm_id_priv);
 609         if (ret)
 610                 goto error;
 611
 612         spin_lock_init(&cm_id_priv->lock);
 613         init_completion(&cm_id_priv->comp);
 614         INIT_LIST_HEAD(&cm_id_priv->work_list);
 615         atomic_set(&cm_id_priv->work_count, -1);
 616         atomic_set(&cm_id_priv->refcount, 1);
 617         return &cm_id_priv->id;
 618
 619 error:
 620         kfree(cm_id_priv);
 621         return ERR_PTR(-ENOMEM);
 622 }
 623 EXPORT_SYMBOL(ib_create_cm_id);
 624
 625 static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv)
 626 {
 627         struct cm_work *work;
 628
 629         if (list_empty(&cm_id_priv->work_list))
 630                 return NULL;
 631
 632         work = list_entry(cm_id_priv->work_list.next, struct cm_work, list);
 633         list_del(&work->list);
 634         return work;
 635 }
 636
 637 static void cm_free_work(struct cm_work *work)
 638 {
 639         if (work->mad_recv_wc)
 640                 ib_free_recv_mad(work->mad_recv_wc);
 641         kfree(work);
 642 }
 643
 644 static inline int cm_convert_to_ms(int iba_time)
 645 {
 646         /* approximate conversion to ms from 4.096us x 2^iba_time */
 647         return 1 << max(iba_time - 8, 0);
 648 }
 649
 650 static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info)
 651 {
 652         if (timewait_info->inserted_remote_id) {
 653                 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table);
 654                 timewait_info->inserted_remote_id = 0;
 655         }
 656
 657         if (timewait_info->inserted_remote_qp) {
 658                 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table);
 659                 timewait_info->inserted_remote_qp = 0;
 660         }
 661 }
 662
 663 static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id)
 664 {
 665         struct cm_timewait_info *timewait_info;
 666
 667         timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL);
 668         if (!timewait_info)
 669                 return ERR_PTR(-ENOMEM);
 670
 671         timewait_info->work.local_id = local_id;
 672         INIT_WORK(&timewait_info->work.work, cm_work_handler,
 673                   &timewait_info->work);
 674         timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT;
 675         return timewait_info;
 676 }
 677
 678 static void cm_enter_timewait(struct cm_id_private *cm_id_priv)
 679 {
 680         int wait_time;
 681         unsigned long flags;
 682
 683         spin_lock_irqsave(&cm.lock, flags);
 684         cm_cleanup_timewait(cm_id_priv->timewait_info);
 685         list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list);
 686         spin_unlock_irqrestore(&cm.lock, flags);
 687
 688         /*
 689          * The cm_id could be destroyed by the user before we exit timewait.
 690          * To protect against this, we search for the cm_id after exiting
 691          * timewait before notifying the user that we've exited timewait.
 692          */
 693         cm_id_priv->id.state = IB_CM_TIMEWAIT;
 694         wait_time = cm_convert_to_ms(cm_id_priv->local_ack_timeout);
 695         queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work,
 696                            msecs_to_jiffies(wait_time));
 697         cm_id_priv->timewait_info = NULL;
 698 }
 699
 700 static void cm_reset_to_idle(struct cm_id_private *cm_id_priv)
 701 {
 702         unsigned long flags;
 703
 704         cm_id_priv->id.state = IB_CM_IDLE;
 705         if (cm_id_priv->timewait_info) {
 706                 spin_lock_irqsave(&cm.lock, flags);
 707                 cm_cleanup_timewait(cm_id_priv->timewait_info);
 708                 spin_unlock_irqrestore(&cm.lock, flags);
 709                 kfree(cm_id_priv->timewait_info);
 710                 cm_id_priv->timewait_info = NULL;
 711         }
 712 }
 713
 714 static void cm_destroy_id(struct ib_cm_id *cm_id, int err)
 715 {
 716         struct cm_id_private *cm_id_priv;
 717         struct cm_work *work;
 718         unsigned long flags;
 719
 720         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
 721 retest:
 722         spin_lock_irqsave(&cm_id_priv->lock, flags);
 723         switch (cm_id->state) {
 724         case IB_CM_LISTEN:
 725                 cm_id->state = IB_CM_IDLE;
 726                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 727                 spin_lock_irqsave(&cm.lock, flags);
 728                 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table);
 729                 spin_unlock_irqrestore(&cm.lock, flags);
 730                 break;
 731         case IB_CM_SIDR_REQ_SENT:
 732                 cm_id->state = IB_CM_IDLE;
 733                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
 734                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 735                 break;
 736         case IB_CM_SIDR_REQ_RCVD:
 737                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 738                 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT);
 739                 break;
 740         case IB_CM_REQ_SENT:
 741                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
 742                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 743                 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT,
 744                                &cm_id_priv->av.port->cm_dev->ca_guid,
 745                                sizeof cm_id_priv->av.port->cm_dev->ca_guid,
 746                                NULL, 0);
 747                 break;
 748         case IB_CM_REQ_RCVD:
 749                 if (err == -ENOMEM) {
 750                         /* Do not reject to allow future retries. */
 751                         cm_reset_to_idle(cm_id_priv);
 752                         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 753                 } else {
 754                         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 755                         ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
 756                                        NULL, 0, NULL, 0);
 757                 }
 758                 break;
 759         case IB_CM_MRA_REQ_RCVD:
 760         case IB_CM_REP_SENT:
 761         case IB_CM_MRA_REP_RCVD:
 762                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
 763                 /* Fall through */
 764         case IB_CM_MRA_REQ_SENT:
 765         case IB_CM_REP_RCVD:
 766         case IB_CM_MRA_REP_SENT:
 767                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 768                 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
 769                                NULL, 0, NULL, 0);
 770                 break;
 771         case IB_CM_ESTABLISHED:
 772                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 773                 ib_send_cm_dreq(cm_id, NULL, 0);
 774                 goto retest;
 775         case IB_CM_DREQ_SENT:
 776                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
 777                 cm_enter_timewait(cm_id_priv);
 778                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 779                 break;
 780         case IB_CM_DREQ_RCVD:
 781                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 782                 ib_send_cm_drep(cm_id, NULL, 0);
 783                 break;
 784         default:
 785                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 786                 break;
 787         }
 788
 789         cm_free_id(cm_id->local_id);
 790         cm_deref_id(cm_id_priv);
 791         wait_for_completion(&cm_id_priv->comp);
 792         while ((work = cm_dequeue_work(cm_id_priv)) != NULL)
 793                 cm_free_work(work);
 794         kfree(cm_id_priv->compare_data);
 795         kfree(cm_id_priv->private_data);
 796         kfree(cm_id_priv);
 797 }
 798
 799 void ib_destroy_cm_id(struct ib_cm_id *cm_id)
 800 {
 801         cm_destroy_id(cm_id, 0);
 802 }
 803 EXPORT_SYMBOL(ib_destroy_cm_id);
 804
 805 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask,
 806                  struct ib_cm_compare_data *compare_data)
 807 {
 808         struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
 809         unsigned long flags;
 810         int ret = 0;
 811
 812         service_mask = service_mask ? service_mask :
 813                        __constant_cpu_to_be64(~0ULL);
 814         service_id &= service_mask;
 815         if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID &&
 816             (service_id != IB_CM_ASSIGN_SERVICE_ID))
 817                 return -EINVAL;
 818
 819         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
 820         if (cm_id->state != IB_CM_IDLE)
 821                 return -EINVAL;
 822
 823         if (compare_data) {
 824                 cm_id_priv->compare_data = kzalloc(sizeof *compare_data,
 825                                                    GFP_KERNEL);
 826                 if (!cm_id_priv->compare_data)
 827                         return -ENOMEM;
 828                 cm_mask_copy(cm_id_priv->compare_data->data,
 829                              compare_data->data, compare_data->mask);
 830                 memcpy(cm_id_priv->compare_data->mask, compare_data->mask,
 831                        IB_CM_COMPARE_SIZE);
 832         }
 833
 834         cm_id->state = IB_CM_LISTEN;
 835
 836         spin_lock_irqsave(&cm.lock, flags);
 837         if (service_id == IB_CM_ASSIGN_SERVICE_ID) {
 838                 cm_id->service_id = cpu_to_be64(cm.listen_service_id++);
 839                 cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
 840         } else {
 841                 cm_id->service_id = service_id;
 842                 cm_id->service_mask = service_mask;
 843         }
 844         cur_cm_id_priv = cm_insert_listen(cm_id_priv);
 845         spin_unlock_irqrestore(&cm.lock, flags);
 846
 847         if (cur_cm_id_priv) {
 848                 cm_id->state = IB_CM_IDLE;
 849                 kfree(cm_id_priv->compare_data);
 850                 cm_id_priv->compare_data = NULL;
 851                 ret = -EBUSY;
 852         }
 853         return ret;
 854 }
 855 EXPORT_SYMBOL(ib_cm_listen);
 856
 857 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv,
 858                           enum cm_msg_sequence msg_seq)
 859 {
 860         u64 hi_tid, low_tid;
 861
 862         hi_tid   = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32;
 863         low_tid  = (u64) ((__force u32)cm_id_priv->id.local_id |
 864                           (msg_seq << 30));
 865         return cpu_to_be64(hi_tid | low_tid);
 866 }
 867
 868 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr,
 869                               __be16 attr_id, __be64 tid)
 870 {
 871         hdr->base_version  = IB_MGMT_BASE_VERSION;
 872         hdr->mgmt_class    = IB_MGMT_CLASS_CM;
 873         hdr->class_version = IB_CM_CLASS_VERSION;
 874         hdr->method        = IB_MGMT_METHOD_SEND;
 875         hdr->attr_id       = attr_id;
 876         hdr->tid           = tid;
 877 }
 878
 879 static void cm_format_req(struct cm_req_msg *req_msg,
 880                           struct cm_id_private *cm_id_priv,
 881                           struct ib_cm_req_param *param)
 882 {
 883         cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID,
 884                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ));
 885
 886         req_msg->local_comm_id = cm_id_priv->id.local_id;
 887         req_msg->service_id = param->service_id;
 888         req_msg->local_ca_guid = cm_id_priv->av.port->cm_dev->ca_guid;
 889         cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num));
 890         cm_req_set_resp_res(req_msg, param->responder_resources);
 891         cm_req_set_init_depth(req_msg, param->initiator_depth);
 892         cm_req_set_remote_resp_timeout(req_msg,
 893                                        param->remote_cm_response_timeout);
 894         cm_req_set_qp_type(req_msg, param->qp_type);
 895         cm_req_set_flow_ctrl(req_msg, param->flow_control);
 896         cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn));
 897         cm_req_set_local_resp_timeout(req_msg,
 898                                       param->local_cm_response_timeout);
 899         cm_req_set_retry_count(req_msg, param->retry_count);
 900         req_msg->pkey = param->primary_path->pkey;
 901         cm_req_set_path_mtu(req_msg, param->primary_path->mtu);
 902         cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count);
 903         cm_req_set_max_cm_retries(req_msg, param->max_cm_retries);
 904         cm_req_set_srq(req_msg, param->srq);
 905
 906         req_msg->primary_local_lid = param->primary_path->slid;
 907         req_msg->primary_remote_lid = param->primary_path->dlid;
 908         req_msg->primary_local_gid = param->primary_path->sgid;
 909         req_msg->primary_remote_gid = param->primary_path->dgid;
 910         cm_req_set_primary_flow_label(req_msg, param->primary_path->flow_label);
 911         cm_req_set_primary_packet_rate(req_msg, param->primary_path->rate);
 912         req_msg->primary_traffic_class = param->primary_path->traffic_class;
 913         req_msg->primary_hop_limit = param->primary_path->hop_limit;
 914         cm_req_set_primary_sl(req_msg, param->primary_path->sl);
 915         cm_req_set_primary_subnet_local(req_msg, 1); /* local only... */
 916         cm_req_set_primary_local_ack_timeout(req_msg,
 917                 min(31, param->primary_path->packet_life_time + 1));
 918
 919         if (param->alternate_path) {
 920                 req_msg->alt_local_lid = param->alternate_path->slid;
 921                 req_msg->alt_remote_lid = param->alternate_path->dlid;
 922                 req_msg->alt_local_gid = param->alternate_path->sgid;
 923                 req_msg->alt_remote_gid = param->alternate_path->dgid;
 924                 cm_req_set_alt_flow_label(req_msg,
 925                                           param->alternate_path->flow_label);
 926                 cm_req_set_alt_packet_rate(req_msg, param->alternate_path->rate);
 927                 req_msg->alt_traffic_class = param->alternate_path->traffic_class;
 928                 req_msg->alt_hop_limit = param->alternate_path->hop_limit;
 929                 cm_req_set_alt_sl(req_msg, param->alternate_path->sl);
 930                 cm_req_set_alt_subnet_local(req_msg, 1); /* local only... */
 931                 cm_req_set_alt_local_ack_timeout(req_msg,
 932                         min(31, param->alternate_path->packet_life_time + 1));
 933         }
 934
 935         if (param->private_data && param->private_data_len)
 936                 memcpy(req_msg->private_data, param->private_data,
 937                        param->private_data_len);
 938 }
 939
 940 static int cm_validate_req_param(struct ib_cm_req_param *param)
 941 {
 942         /* peer-to-peer not supported */
 943         if (param->peer_to_peer)
 944                 return -EINVAL;
 945
 946         if (!param->primary_path)
 947                 return -EINVAL;
 948
 949         if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC)
 950                 return -EINVAL;
 951
 952         if (param->private_data &&
 953             param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE)
 954                 return -EINVAL;
 955
 956         if (param->alternate_path &&
 957             (param->alternate_path->pkey != param->primary_path->pkey ||
 958              param->alternate_path->mtu != param->primary_path->mtu))
 959                 return -EINVAL;
 960
 961         return 0;
 962 }
 963
 964 int ib_send_cm_req(struct ib_cm_id *cm_id,
 965                    struct ib_cm_req_param *param)
 966 {
 967         struct cm_id_private *cm_id_priv;
 968         struct cm_req_msg *req_msg;
 969         unsigned long flags;
 970         int ret;
 971
 972         ret = cm_validate_req_param(param);
 973         if (ret)
 974                 return ret;
 975
 976         /* Verify that we're not in timewait. */
 977         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
 978         spin_lock_irqsave(&cm_id_priv->lock, flags);
 979         if (cm_id->state != IB_CM_IDLE) {
 980                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 981                 ret = -EINVAL;
 982                 goto out;
 983         }
 984         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 985
 986         cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
 987                                                             id.local_id);
 988         if (IS_ERR(cm_id_priv->timewait_info)) {
 989                 ret = PTR_ERR(cm_id_priv->timewait_info);
 990                 goto out;
 991         }
 992
 993         ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av);
 994         if (ret)
 995                 goto error1;
 996         if (param->alternate_path) {
 997                 ret = cm_init_av_by_path(param->alternate_path,
 998                                          &cm_id_priv->alt_av);
 999                 if (ret)
1000                         goto error1;
1001         }
1002         cm_id->service_id = param->service_id;
1003         cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
1004         cm_id_priv->timeout_ms = cm_convert_to_ms(
1005                                     param->primary_path->packet_life_time) * 2 +
1006                                  cm_convert_to_ms(
1007                                     param->remote_cm_response_timeout);
1008         cm_id_priv->max_cm_retries = param->max_cm_retries;
1009         cm_id_priv->initiator_depth = param->initiator_depth;
1010         cm_id_priv->responder_resources = param->responder_resources;
1011         cm_id_priv->retry_count = param->retry_count;
1012         cm_id_priv->path_mtu = param->primary_path->mtu;
1013         cm_id_priv->qp_type = param->qp_type;
1014
1015         ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg);
1016         if (ret)
1017                 goto error1;
1018
1019         req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad;
1020         cm_format_req(req_msg, cm_id_priv, param);
1021         cm_id_priv->tid = req_msg->hdr.tid;
1022         cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms;
1023         cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT;
1024
1025         cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg);
1026         cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg);
1027         cm_id_priv->local_ack_timeout =
1028                                 cm_req_get_primary_local_ack_timeout(req_msg);
1029
1030         spin_lock_irqsave(&cm_id_priv->lock, flags);
1031         ret = ib_post_send_mad(cm_id_priv->msg, NULL);
1032         if (ret) {
1033                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1034                 goto error2;
1035         }
1036         BUG_ON(cm_id->state != IB_CM_IDLE);
1037         cm_id->state = IB_CM_REQ_SENT;
1038         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1039         return 0;
1040
1041 error2: cm_free_msg(cm_id_priv->msg);
1042 error1: kfree(cm_id_priv->timewait_info);
1043 out:    return ret;
1044 }
1045 EXPORT_SYMBOL(ib_send_cm_req);
1046
1047 static int cm_issue_rej(struct cm_port *port,
1048                         struct ib_mad_recv_wc *mad_recv_wc,
1049                         enum ib_cm_rej_reason reason,
1050                         enum cm_msg_response msg_rejected,
1051                         void *ari, u8 ari_length)
1052 {
1053         struct ib_mad_send_buf *msg = NULL;
1054         struct cm_rej_msg *rej_msg, *rcv_msg;
1055         int ret;
1056
1057         ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
1058         if (ret)
1059                 return ret;
1060
1061         /* We just need common CM header information.  Cast to any message. */
1062         rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad;
1063         rej_msg = (struct cm_rej_msg *) msg->mad;
1064
1065         cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid);
1066         rej_msg->remote_comm_id = rcv_msg->local_comm_id;
1067         rej_msg->local_comm_id = rcv_msg->remote_comm_id;
1068         cm_rej_set_msg_rejected(rej_msg, msg_rejected);
1069         rej_msg->reason = cpu_to_be16(reason);
1070
1071         if (ari && ari_length) {
1072                 cm_rej_set_reject_info_len(rej_msg, ari_length);
1073                 memcpy(rej_msg->ari, ari, ari_length);
1074         }
1075
1076         ret = ib_post_send_mad(msg, NULL);
1077         if (ret)
1078                 cm_free_msg(msg);
1079
1080         return ret;
1081 }
1082
1083 static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid,
1084                                     __be32 local_qpn, __be32 remote_qpn)
1085 {
1086         return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) ||
1087                 ((local_ca_guid == remote_ca_guid) &&
1088                  (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn))));
1089 }
1090
1091 static void cm_format_paths_from_req(struct cm_req_msg *req_msg,
1092                                             struct ib_sa_path_rec *primary_path,
1093                                             struct ib_sa_path_rec *alt_path)
1094 {
1095         memset(primary_path, 0, sizeof *primary_path);
1096         primary_path->dgid = req_msg->primary_local_gid;
1097         primary_path->sgid = req_msg->primary_remote_gid;
1098         primary_path->dlid = req_msg->primary_local_lid;
1099         primary_path->slid = req_msg->primary_remote_lid;
1100         primary_path->flow_label = cm_req_get_primary_flow_label(req_msg);
1101         primary_path->hop_limit = req_msg->primary_hop_limit;
1102         primary_path->traffic_class = req_msg->primary_traffic_class;
1103         primary_path->reversible = 1;
1104         primary_path->pkey = req_msg->pkey;
1105         primary_path->sl = cm_req_get_primary_sl(req_msg);
1106         primary_path->mtu_selector = IB_SA_EQ;
1107         primary_path->mtu = cm_req_get_path_mtu(req_msg);
1108         primary_path->rate_selector = IB_SA_EQ;
1109         primary_path->rate = cm_req_get_primary_packet_rate(req_msg);
1110         primary_path->packet_life_time_selector = IB_SA_EQ;
1111         primary_path->packet_life_time =
1112                 cm_req_get_primary_local_ack_timeout(req_msg);
1113         primary_path->packet_life_time -= (primary_path->packet_life_time > 0);
1114
1115         if (req_msg->alt_local_lid) {
1116                 memset(alt_path, 0, sizeof *alt_path);
1117                 alt_path->dgid = req_msg->alt_local_gid;
1118                 alt_path->sgid = req_msg->alt_remote_gid;
1119                 alt_path->dlid = req_msg->alt_local_lid;
1120                 alt_path->slid = req_msg->alt_remote_lid;
1121                 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg);
1122                 alt_path->hop_limit = req_msg->alt_hop_limit;
1123                 alt_path->traffic_class = req_msg->alt_traffic_class;
1124                 alt_path->reversible = 1;
1125                 alt_path->pkey = req_msg->pkey;
1126                 alt_path->sl = cm_req_get_alt_sl(req_msg);
1127                 alt_path->mtu_selector = IB_SA_EQ;
1128                 alt_path->mtu = cm_req_get_path_mtu(req_msg);
1129                 alt_path->rate_selector = IB_SA_EQ;
1130                 alt_path->rate = cm_req_get_alt_packet_rate(req_msg);
1131                 alt_path->packet_life_time_selector = IB_SA_EQ;
1132                 alt_path->packet_life_time =
1133                         cm_req_get_alt_local_ack_timeout(req_msg);
1134                 alt_path->packet_life_time -= (alt_path->packet_life_time > 0);
1135         }
1136 }
1137
1138 static void cm_format_req_event(struct cm_work *work,
1139                                 struct cm_id_private *cm_id_priv,
1140                                 struct ib_cm_id *listen_id)
1141 {
1142         struct cm_req_msg *req_msg;
1143         struct ib_cm_req_event_param *param;
1144
1145         req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1146         param = &work->cm_event.param.req_rcvd;
1147         param->listen_id = listen_id;
1148         param->port = cm_id_priv->av.port->port_num;
1149         param->primary_path = &work->path[0];
1150         if (req_msg->alt_local_lid)
1151                 param->alternate_path = &work->path[1];
1152         else
1153                 param->alternate_path = NULL;
1154         param->remote_ca_guid = req_msg->local_ca_guid;
1155         param->remote_qkey = be32_to_cpu(req_msg->local_qkey);
1156         param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg));
1157         param->qp_type = cm_req_get_qp_type(req_msg);
1158         param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg));
1159         param->responder_resources = cm_req_get_init_depth(req_msg);
1160         param->initiator_depth = cm_req_get_resp_res(req_msg);
1161         param->local_cm_response_timeout =
1162                                         cm_req_get_remote_resp_timeout(req_msg);
1163         param->flow_control = cm_req_get_flow_ctrl(req_msg);
1164         param->remote_cm_response_timeout =
1165                                         cm_req_get_local_resp_timeout(req_msg);
1166         param->retry_count = cm_req_get_retry_count(req_msg);
1167         param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1168         param->srq = cm_req_get_srq(req_msg);
1169         work->cm_event.private_data = &req_msg->private_data;
1170 }
1171
1172 static void cm_process_work(struct cm_id_private *cm_id_priv,
1173                             struct cm_work *work)
1174 {
1175         unsigned long flags;
1176         int ret;
1177
1178         /* We will typically only have the current event to report. */
1179         ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
1180         cm_free_work(work);
1181
1182         while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) {
1183                 spin_lock_irqsave(&cm_id_priv->lock, flags);
1184                 work = cm_dequeue_work(cm_id_priv);
1185                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1186                 BUG_ON(!work);
1187                 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id,
1188                                                 &work->cm_event);
1189                 cm_free_work(work);
1190         }
1191         cm_deref_id(cm_id_priv);
1192         if (ret)
1193                 cm_destroy_id(&cm_id_priv->id, ret);
1194 }
1195
1196 static void cm_format_mra(struct cm_mra_msg *mra_msg,
1197                           struct cm_id_private *cm_id_priv,
1198                           enum cm_msg_response msg_mraed, u8 service_timeout,
1199                           const void *private_data, u8 private_data_len)
1200 {
1201         cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid);
1202         cm_mra_set_msg_mraed(mra_msg, msg_mraed);
1203         mra_msg->local_comm_id = cm_id_priv->id.local_id;
1204         mra_msg->remote_comm_id = cm_id_priv->id.remote_id;
1205         cm_mra_set_service_timeout(mra_msg, service_timeout);
1206
1207         if (private_data && private_data_len)
1208                 memcpy(mra_msg->private_data, private_data, private_data_len);
1209 }
1210
1211 static void cm_format_rej(struct cm_rej_msg *rej_msg,
1212                           struct cm_id_private *cm_id_priv,
1213                           enum ib_cm_rej_reason reason,
1214                           void *ari,
1215                           u8 ari_length,
1216                           const void *private_data,
1217                           u8 private_data_len)
1218 {
1219         cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid);
1220         rej_msg->remote_comm_id = cm_id_priv->id.remote_id;
1221
1222         switch(cm_id_priv->id.state) {
1223         case IB_CM_REQ_RCVD:
1224                 rej_msg->local_comm_id = 0;
1225                 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1226                 break;
1227         case IB_CM_MRA_REQ_SENT:
1228                 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1229                 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1230                 break;
1231         case IB_CM_REP_RCVD:
1232         case IB_CM_MRA_REP_SENT:
1233                 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1234                 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP);
1235                 break;
1236         default:
1237                 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1238                 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER);
1239                 break;
1240         }
1241
1242         rej_msg->reason = cpu_to_be16(reason);
1243         if (ari && ari_length) {
1244                 cm_rej_set_reject_info_len(rej_msg, ari_length);
1245                 memcpy(rej_msg->ari, ari, ari_length);
1246         }
1247
1248         if (private_data && private_data_len)
1249                 memcpy(rej_msg->private_data, private_data, private_data_len);
1250 }
1251
1252 static void cm_dup_req_handler(struct cm_work *work,
1253                                struct cm_id_private *cm_id_priv)
1254 {
1255         struct ib_mad_send_buf *msg = NULL;
1256         unsigned long flags;
1257         int ret;
1258
1259         /* Quick state check to discard duplicate REQs. */
1260         if (cm_id_priv->id.state == IB_CM_REQ_RCVD)
1261                 return;
1262
1263         ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1264         if (ret)
1265                 return;
1266
1267         spin_lock_irqsave(&cm_id_priv->lock, flags);
1268         switch (cm_id_priv->id.state) {
1269         case IB_CM_MRA_REQ_SENT:
1270                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1271                               CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout,
1272                               cm_id_priv->private_data,
1273                               cm_id_priv->private_data_len);
1274                 break;
1275         case IB_CM_TIMEWAIT:
1276                 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv,
1277                               IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0);
1278                 break;
1279         default:
1280                 goto unlock;
1281         }
1282         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1283
1284         ret = ib_post_send_mad(msg, NULL);
1285         if (ret)
1286                 goto free;
1287         return;
1288
1289 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1290 free:   cm_free_msg(msg);
1291 }
1292
1293 static struct cm_id_private * cm_match_req(struct cm_work *work,
1294                                            struct cm_id_private *cm_id_priv)
1295 {
1296         struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv;
1297         struct cm_timewait_info *timewait_info;
1298         struct cm_req_msg *req_msg;
1299         unsigned long flags;
1300
1301         req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1302
1303         /* Check for duplicate REQ and stale connections. */
1304         spin_lock_irqsave(&cm.lock, flags);
1305         timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info);
1306         if (!timewait_info)
1307                 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
1308
1309         if (timewait_info) {
1310                 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
1311                                            timewait_info->work.remote_id);
1312                 cm_cleanup_timewait(cm_id_priv->timewait_info);
1313                 spin_unlock_irqrestore(&cm.lock, flags);
1314                 if (cur_cm_id_priv) {
1315                         cm_dup_req_handler(work, cur_cm_id_priv);
1316                         cm_deref_id(cur_cm_id_priv);
1317                 } else
1318                         cm_issue_rej(work->port, work->mad_recv_wc,
1319                                      IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
1320                                      NULL, 0);
1321                 listen_cm_id_priv = NULL;
1322                 goto out;
1323         }
1324
1325         /* Find matching listen request. */
1326         listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device,
1327                                            req_msg->service_id,
1328                                            req_msg->private_data);
1329         if (!listen_cm_id_priv) {
1330                 cm_cleanup_timewait(cm_id_priv->timewait_info);
1331                 spin_unlock_irqrestore(&cm.lock, flags);
1332                 cm_issue_rej(work->port, work->mad_recv_wc,
1333                              IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ,
1334                              NULL, 0);
1335                 goto out;
1336         }
1337         atomic_inc(&listen_cm_id_priv->refcount);
1338         atomic_inc(&cm_id_priv->refcount);
1339         cm_id_priv->id.state = IB_CM_REQ_RCVD;
1340         atomic_inc(&cm_id_priv->work_count);
1341         spin_unlock_irqrestore(&cm.lock, flags);
1342 out:
1343         return listen_cm_id_priv;
1344 }
1345
1346 static int cm_req_handler(struct cm_work *work)
1347 {
1348         struct ib_cm_id *cm_id;
1349         struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
1350         struct cm_req_msg *req_msg;
1351         int ret;
1352
1353         req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1354
1355         cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL);
1356         if (IS_ERR(cm_id))
1357                 return PTR_ERR(cm_id);
1358
1359         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1360         cm_id_priv->id.remote_id = req_msg->local_comm_id;
1361         cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
1362                                 work->mad_recv_wc->recv_buf.grh,
1363                                 &cm_id_priv->av);
1364         cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1365                                                             id.local_id);
1366         if (IS_ERR(cm_id_priv->timewait_info)) {
1367                 ret = PTR_ERR(cm_id_priv->timewait_info);
1368                 goto destroy;
1369         }
1370         cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id;
1371         cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid;
1372         cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg);
1373
1374         listen_cm_id_priv = cm_match_req(work, cm_id_priv);
1375         if (!listen_cm_id_priv) {
1376                 ret = -EINVAL;
1377                 kfree(cm_id_priv->timewait_info);
1378                 goto destroy;
1379         }
1380
1381         cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
1382         cm_id_priv->id.context = listen_cm_id_priv->id.context;
1383         cm_id_priv->id.service_id = req_msg->service_id;
1384         cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL);
1385
1386         cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]);
1387         ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av);
1388         if (ret) {
1389                 ib_get_cached_gid(work->port->cm_dev->device,
1390                                   work->port->port_num, 0, &work->path[0].sgid);
1391                 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID,
1392                                &work->path[0].sgid, sizeof work->path[0].sgid,
1393                                NULL, 0);
1394                 goto rejected;
1395         }
1396         if (req_msg->alt_local_lid) {
1397                 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av);
1398                 if (ret) {
1399                         ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID,
1400                                        &work->path[0].sgid,
1401                                        sizeof work->path[0].sgid, NULL, 0);
1402                         goto rejected;
1403                 }
1404         }
1405         cm_id_priv->tid = req_msg->hdr.tid;
1406         cm_id_priv->timeout_ms = cm_convert_to_ms(
1407                                         cm_req_get_local_resp_timeout(req_msg));
1408         cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg);
1409         cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg);
1410         cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg);
1411         cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg);
1412         cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg);
1413         cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg);
1414         cm_id_priv->local_ack_timeout =
1415                                 cm_req_get_primary_local_ack_timeout(req_msg);
1416         cm_id_priv->retry_count = cm_req_get_retry_count(req_msg);
1417         cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1418         cm_id_priv->qp_type = cm_req_get_qp_type(req_msg);
1419
1420         cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
1421         cm_process_work(cm_id_priv, work);
1422         cm_deref_id(listen_cm_id_priv);
1423         return 0;
1424
1425 rejected:
1426         atomic_dec(&cm_id_priv->refcount);
1427         cm_deref_id(listen_cm_id_priv);
1428 destroy:
1429         ib_destroy_cm_id(cm_id);
1430         return ret;
1431 }
1432
1433 static void cm_format_rep(struct cm_rep_msg *rep_msg,
1434                           struct cm_id_private *cm_id_priv,
1435                           struct ib_cm_rep_param *param)
1436 {
1437         cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid);
1438         rep_msg->local_comm_id = cm_id_priv->id.local_id;
1439         rep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1440         cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num));
1441         cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn));
1442         rep_msg->resp_resources = param->responder_resources;
1443         rep_msg->initiator_depth = param->initiator_depth;
1444         cm_rep_set_target_ack_delay(rep_msg, param->target_ack_delay);
1445         cm_rep_set_failover(rep_msg, param->failover_accepted);
1446         cm_rep_set_flow_ctrl(rep_msg, param->flow_control);
1447         cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count);
1448         cm_rep_set_srq(rep_msg, param->srq);
1449         rep_msg->local_ca_guid = cm_id_priv->av.port->cm_dev->ca_guid;
1450
1451         if (param->private_data && param->private_data_len)
1452                 memcpy(rep_msg->private_data, param->private_data,
1453                        param->private_data_len);
1454 }
1455
1456 int ib_send_cm_rep(struct ib_cm_id *cm_id,
1457                    struct ib_cm_rep_param *param)
1458 {
1459         struct cm_id_private *cm_id_priv;
1460         struct ib_mad_send_buf *msg;
1461         struct cm_rep_msg *rep_msg;
1462         unsigned long flags;
1463         int ret;
1464
1465         if (param->private_data &&
1466             param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE)
1467                 return -EINVAL;
1468
1469         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1470         spin_lock_irqsave(&cm_id_priv->lock, flags);
1471         if (cm_id->state != IB_CM_REQ_RCVD &&
1472             cm_id->state != IB_CM_MRA_REQ_SENT) {
1473                 ret = -EINVAL;
1474                 goto out;
1475         }
1476
1477         ret = cm_alloc_msg(cm_id_priv, &msg);
1478         if (ret)
1479                 goto out;
1480
1481         rep_msg = (struct cm_rep_msg *) msg->mad;
1482         cm_format_rep(rep_msg, cm_id_priv, param);
1483         msg->timeout_ms = cm_id_priv->timeout_ms;
1484         msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;
1485
1486         ret = ib_post_send_mad(msg, NULL);
1487         if (ret) {
1488                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1489                 cm_free_msg(msg);
1490                 return ret;
1491         }
1492
1493         cm_id->state = IB_CM_REP_SENT;
1494         cm_id_priv->msg = msg;
1495         cm_id_priv->initiator_depth = param->initiator_depth;
1496         cm_id_priv->responder_resources = param->responder_resources;
1497         cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg);
1498         cm_id_priv->local_qpn = cm_rep_get_local_qpn(rep_msg);
1499
1500 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1501         return ret;
1502 }
1503 EXPORT_SYMBOL(ib_send_cm_rep);
1504
1505 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg,
1506                           struct cm_id_private *cm_id_priv,
1507                           const void *private_data,
1508                           u8 private_data_len)
1509 {
1510         cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid);
1511         rtu_msg->local_comm_id = cm_id_priv->id.local_id;
1512         rtu_msg->remote_comm_id = cm_id_priv->id.remote_id;
1513
1514         if (private_data && private_data_len)
1515                 memcpy(rtu_msg->private_data, private_data, private_data_len);
1516 }
1517
1518 int ib_send_cm_rtu(struct ib_cm_id *cm_id,
1519                    const void *private_data,
1520                    u8 private_data_len)
1521 {
1522         struct cm_id_private *cm_id_priv;
1523         struct ib_mad_send_buf *msg;
1524         unsigned long flags;
1525         void *data;
1526         int ret;
1527
1528         if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE)
1529                 return -EINVAL;
1530
1531         data = cm_copy_private_data(private_data, private_data_len);
1532         if (IS_ERR(data))
1533                 return PTR_ERR(data);
1534
1535         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1536         spin_lock_irqsave(&cm_id_priv->lock, flags);
1537         if (cm_id->state != IB_CM_REP_RCVD &&
1538             cm_id->state != IB_CM_MRA_REP_SENT) {
1539                 ret = -EINVAL;
1540                 goto error;
1541         }
1542
1543         ret = cm_alloc_msg(cm_id_priv, &msg);
1544         if (ret)
1545                 goto error;
1546
1547         cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1548                       private_data, private_data_len);
1549
1550         ret = ib_post_send_mad(msg, NULL);
1551         if (ret) {
1552                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1553                 cm_free_msg(msg);
1554                 kfree(data);
1555                 return ret;
1556         }
1557
1558         cm_id->state = IB_CM_ESTABLISHED;
1559         cm_set_private_data(cm_id_priv, data, private_data_len);
1560         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1561         return 0;
1562
1563 error:  spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1564         kfree(data);
1565         return ret;
1566 }
1567 EXPORT_SYMBOL(ib_send_cm_rtu);
1568
1569 static void cm_format_rep_event(struct cm_work *work)
1570 {
1571         struct cm_rep_msg *rep_msg;
1572         struct ib_cm_rep_event_param *param;
1573
1574         rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1575         param = &work->cm_event.param.rep_rcvd;
1576         param->remote_ca_guid = rep_msg->local_ca_guid;
1577         param->remote_qkey = be32_to_cpu(rep_msg->local_qkey);
1578         param->remote_qpn = be32_to_cpu(cm_rep_get_local_qpn(rep_msg));
1579         param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg));
1580         param->responder_resources = rep_msg->initiator_depth;
1581         param->initiator_depth = rep_msg->resp_resources;
1582         param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
1583         param->failover_accepted = cm_rep_get_failover(rep_msg);
1584         param->flow_control = cm_rep_get_flow_ctrl(rep_msg);
1585         param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1586         param->srq = cm_rep_get_srq(rep_msg);
1587         work->cm_event.private_data = &rep_msg->private_data;
1588 }
1589
1590 static void cm_dup_rep_handler(struct cm_work *work)
1591 {
1592         struct cm_id_private *cm_id_priv;
1593         struct cm_rep_msg *rep_msg;
1594         struct ib_mad_send_buf *msg = NULL;
1595         unsigned long flags;
1596         int ret;
1597
1598         rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad;
1599         cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id,
1600                                    rep_msg->local_comm_id);
1601         if (!cm_id_priv)
1602                 return;
1603
1604         ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1605         if (ret)
1606                 goto deref;
1607
1608         spin_lock_irqsave(&cm_id_priv->lock, flags);
1609         if (cm_id_priv->id.state == IB_CM_ESTABLISHED)
1610                 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1611                               cm_id_priv->private_data,
1612                               cm_id_priv->private_data_len);
1613         else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT)
1614                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1615                               CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout,
1616                               cm_id_priv->private_data,
1617                               cm_id_priv->private_data_len);
1618         else
1619                 goto unlock;
1620         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1621
1622         ret = ib_post_send_mad(msg, NULL);
1623         if (ret)
1624                 goto free;
1625         goto deref;
1626
1627 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1628 free:   cm_free_msg(msg);
1629 deref:  cm_deref_id(cm_id_priv);
1630 }
1631
1632 static int cm_rep_handler(struct cm_work *work)
1633 {
1634         struct cm_id_private *cm_id_priv;
1635         struct cm_rep_msg *rep_msg;
1636         unsigned long flags;
1637         int ret;
1638
1639         rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1640         cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0);
1641         if (!cm_id_priv) {
1642                 cm_dup_rep_handler(work);
1643                 return -EINVAL;
1644         }
1645
1646         cm_format_rep_event(work);
1647
1648         spin_lock_irqsave(&cm_id_priv->lock, flags);
1649         switch (cm_id_priv->id.state) {
1650         case IB_CM_REQ_SENT:
1651         case IB_CM_MRA_REQ_RCVD:
1652                 break;
1653         default:
1654                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1655                 ret = -EINVAL;
1656                 goto error;
1657         }
1658
1659         cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id;
1660         cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid;
1661         cm_id_priv->timewait_info->remote_qpn = cm_rep_get_local_qpn(rep_msg);
1662
1663         spin_lock(&cm.lock);
1664         /* Check for duplicate REP. */
1665         if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
1666                 spin_unlock(&cm.lock);
1667                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1668                 ret = -EINVAL;
1669                 goto error;
1670         }
1671         /* Check for a stale connection. */
1672         if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) {
1673                 rb_erase(&cm_id_priv->timewait_info->remote_id_node,
1674                          &cm.remote_id_table);
1675                 cm_id_priv->timewait_info->inserted_remote_id = 0;
1676                 spin_unlock(&cm.lock);
1677                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1678                 cm_issue_rej(work->port, work->mad_recv_wc,
1679                              IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP,
1680                              NULL, 0);
1681                 ret = -EINVAL;
1682                 goto error;
1683         }
1684         spin_unlock(&cm.lock);
1685
1686         cm_id_priv->id.state = IB_CM_REP_RCVD;
1687         cm_id_priv->id.remote_id = rep_msg->local_comm_id;
1688         cm_id_priv->remote_qpn = cm_rep_get_local_qpn(rep_msg);
1689         cm_id_priv->initiator_depth = rep_msg->resp_resources;
1690         cm_id_priv->responder_resources = rep_msg->initiator_depth;
1691         cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg);
1692         cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1693
1694         /* todo: handle peer_to_peer */
1695
1696         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1697         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1698         if (!ret)
1699                 list_add_tail(&work->list, &cm_id_priv->work_list);
1700         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1701
1702         if (ret)
1703                 cm_process_work(cm_id_priv, work);
1704         else
1705                 cm_deref_id(cm_id_priv);
1706         return 0;
1707
1708 error:
1709         cm_deref_id(cm_id_priv);
1710         return ret;
1711 }
1712
1713 static int cm_establish_handler(struct cm_work *work)
1714 {
1715         struct cm_id_private *cm_id_priv;
1716         unsigned long flags;
1717         int ret;
1718
1719         /* See comment in ib_cm_establish about lookup. */
1720         cm_id_priv = cm_acquire_id(work->local_id, work->remote_id);
1721         if (!cm_id_priv)
1722                 return -EINVAL;
1723
1724         spin_lock_irqsave(&cm_id_priv->lock, flags);
1725         if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
1726                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1727                 goto out;
1728         }
1729
1730         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1731         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1732         if (!ret)
1733                 list_add_tail(&work->list, &cm_id_priv->work_list);
1734         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1735
1736         if (ret)
1737                 cm_process_work(cm_id_priv, work);
1738         else
1739                 cm_deref_id(cm_id_priv);
1740         return 0;
1741 out:
1742         cm_deref_id(cm_id_priv);
1743         return -EINVAL;
1744 }
1745
1746 static int cm_rtu_handler(struct cm_work *work)
1747 {
1748         struct cm_id_private *cm_id_priv;
1749         struct cm_rtu_msg *rtu_msg;
1750         unsigned long flags;
1751         int ret;
1752
1753         rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad;
1754         cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id,
1755                                    rtu_msg->local_comm_id);
1756         if (!cm_id_priv)
1757                 return -EINVAL;
1758
1759         work->cm_event.private_data = &rtu_msg->private_data;
1760
1761         spin_lock_irqsave(&cm_id_priv->lock, flags);
1762         if (cm_id_priv->id.state != IB_CM_REP_SENT &&
1763             cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
1764                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1765                 goto out;
1766         }
1767         cm_id_priv->id.state = IB_CM_ESTABLISHED;
1768
1769         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1770         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1771         if (!ret)
1772                 list_add_tail(&work->list, &cm_id_priv->work_list);
1773         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1774
1775         if (ret)
1776                 cm_process_work(cm_id_priv, work);
1777         else
1778                 cm_deref_id(cm_id_priv);
1779         return 0;
1780 out:
1781         cm_deref_id(cm_id_priv);
1782         return -EINVAL;
1783 }
1784
1785 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg,
1786                           struct cm_id_private *cm_id_priv,
1787                           const void *private_data,
1788                           u8 private_data_len)
1789 {
1790         cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID,
1791                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ));
1792         dreq_msg->local_comm_id = cm_id_priv->id.local_id;
1793         dreq_msg->remote_comm_id = cm_id_priv->id.remote_id;
1794         cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn);
1795
1796         if (private_data && private_data_len)
1797                 memcpy(dreq_msg->private_data, private_data, private_data_len);
1798 }
1799
1800 int ib_send_cm_dreq(struct ib_cm_id *cm_id,
1801                     const void *private_data,
1802                     u8 private_data_len)
1803 {
1804         struct cm_id_private *cm_id_priv;
1805         struct ib_mad_send_buf *msg;
1806         unsigned long flags;
1807         int ret;
1808
1809         if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE)
1810                 return -EINVAL;
1811
1812         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1813         spin_lock_irqsave(&cm_id_priv->lock, flags);
1814         if (cm_id->state != IB_CM_ESTABLISHED) {
1815                 ret = -EINVAL;
1816                 goto out;
1817         }
1818
1819         ret = cm_alloc_msg(cm_id_priv, &msg);
1820         if (ret) {
1821                 cm_enter_timewait(cm_id_priv);
1822                 goto out;
1823         }
1824
1825         cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv,
1826                        private_data, private_data_len);
1827         msg->timeout_ms = cm_id_priv->timeout_ms;
1828         msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
1829
1830         ret = ib_post_send_mad(msg, NULL);
1831         if (ret) {
1832                 cm_enter_timewait(cm_id_priv);
1833                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1834                 cm_free_msg(msg);
1835                 return ret;
1836         }
1837
1838         cm_id->state = IB_CM_DREQ_SENT;
1839         cm_id_priv->msg = msg;
1840 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1841         return ret;
1842 }
1843 EXPORT_SYMBOL(ib_send_cm_dreq);
1844
1845 static void cm_format_drep(struct cm_drep_msg *drep_msg,
1846                           struct cm_id_private *cm_id_priv,
1847                           const void *private_data,
1848                           u8 private_data_len)
1849 {
1850         cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid);
1851         drep_msg->local_comm_id = cm_id_priv->id.local_id;
1852         drep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1853
1854         if (private_data && private_data_len)
1855                 memcpy(drep_msg->private_data, private_data, private_data_len);
1856 }
1857
1858 int ib_send_cm_drep(struct ib_cm_id *cm_id,
1859                     const void *private_data,
1860                     u8 private_data_len)
1861 {
1862         struct cm_id_private *cm_id_priv;
1863         struct ib_mad_send_buf *msg;
1864         unsigned long flags;
1865         void *data;
1866         int ret;
1867
1868         if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
1869                 return -EINVAL;
1870
1871         data = cm_copy_private_data(private_data, private_data_len);
1872         if (IS_ERR(data))
1873                 return PTR_ERR(data);
1874
1875         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1876         spin_lock_irqsave(&cm_id_priv->lock, flags);
1877         if (cm_id->state != IB_CM_DREQ_RCVD) {
1878                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1879                 kfree(data);
1880                 return -EINVAL;
1881         }
1882
1883         cm_set_private_data(cm_id_priv, data, private_data_len);
1884         cm_enter_timewait(cm_id_priv);
1885
1886         ret = cm_alloc_msg(cm_id_priv, &msg);
1887         if (ret)
1888                 goto out;
1889
1890         cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
1891                        private_data, private_data_len);
1892
1893         ret = ib_post_send_mad(msg, NULL);
1894         if (ret) {
1895                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1896                 cm_free_msg(msg);
1897                 return ret;
1898         }
1899
1900 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1901         return ret;
1902 }
1903 EXPORT_SYMBOL(ib_send_cm_drep);
1904
1905 static int cm_issue_drep(struct cm_port *port,
1906                          struct ib_mad_recv_wc *mad_recv_wc)
1907 {
1908         struct ib_mad_send_buf *msg = NULL;
1909         struct cm_dreq_msg *dreq_msg;
1910         struct cm_drep_msg *drep_msg;
1911         int ret;
1912
1913         ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
1914         if (ret)
1915                 return ret;
1916
1917         dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad;
1918         drep_msg = (struct cm_drep_msg *) msg->mad;
1919
1920         cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid);
1921         drep_msg->remote_comm_id = dreq_msg->local_comm_id;
1922         drep_msg->local_comm_id = dreq_msg->remote_comm_id;
1923
1924         ret = ib_post_send_mad(msg, NULL);
1925         if (ret)
1926                 cm_free_msg(msg);
1927
1928         return ret;
1929 }
1930
1931 static int cm_dreq_handler(struct cm_work *work)
1932 {
1933         struct cm_id_private *cm_id_priv;
1934         struct cm_dreq_msg *dreq_msg;
1935         struct ib_mad_send_buf *msg = NULL;
1936         unsigned long flags;
1937         int ret;
1938
1939         dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
1940         cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id,
1941                                    dreq_msg->local_comm_id);
1942         if (!cm_id_priv) {
1943                 cm_issue_drep(work->port, work->mad_recv_wc);
1944                 return -EINVAL;
1945         }
1946
1947         work->cm_event.private_data = &dreq_msg->private_data;
1948
1949         spin_lock_irqsave(&cm_id_priv->lock, flags);
1950         if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg))
1951                 goto unlock;
1952
1953         switch (cm_id_priv->id.state) {
1954         case IB_CM_REP_SENT:
1955         case IB_CM_DREQ_SENT:
1956                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1957                 break;
1958         case IB_CM_ESTABLISHED:
1959         case IB_CM_MRA_REP_RCVD:
1960                 break;
1961         case IB_CM_TIMEWAIT:
1962                 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
1963                         goto unlock;
1964
1965                 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
1966                                cm_id_priv->private_data,
1967                                cm_id_priv->private_data_len);
1968                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1969
1970                 if (ib_post_send_mad(msg, NULL))
1971                         cm_free_msg(msg);
1972                 goto deref;
1973         default:
1974                 goto unlock;
1975         }
1976         cm_id_priv->id.state = IB_CM_DREQ_RCVD;
1977         cm_id_priv->tid = dreq_msg->hdr.tid;
1978         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1979         if (!ret)
1980                 list_add_tail(&work->list, &cm_id_priv->work_list);
1981         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1982
1983         if (ret)
1984                 cm_process_work(cm_id_priv, work);
1985         else
1986                 cm_deref_id(cm_id_priv);
1987         return 0;
1988
1989 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1990 deref:  cm_deref_id(cm_id_priv);
1991         return -EINVAL;
1992 }
1993
1994 static int cm_drep_handler(struct cm_work *work)
1995 {
1996         struct cm_id_private *cm_id_priv;
1997         struct cm_drep_msg *drep_msg;
1998         unsigned long flags;
1999         int ret;
2000
2001         drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
2002         cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id,
2003                                    drep_msg->local_comm_id);
2004         if (!cm_id_priv)
2005                 return -EINVAL;
2006
2007         work->cm_event.private_data = &drep_msg->private_data;
2008
2009         spin_lock_irqsave(&cm_id_priv->lock, flags);
2010         if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
2011             cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
2012                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2013                 goto out;
2014         }
2015         cm_enter_timewait(cm_id_priv);
2016
2017         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2018         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2019         if (!ret)
2020                 list_add_tail(&work->list, &cm_id_priv->work_list);
2021         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2022
2023         if (ret)
2024                 cm_process_work(cm_id_priv, work);
2025         else
2026                 cm_deref_id(cm_id_priv);
2027         return 0;
2028 out:
2029         cm_deref_id(cm_id_priv);
2030         return -EINVAL;
2031 }
2032
2033 int ib_send_cm_rej(struct ib_cm_id *cm_id,
2034                    enum ib_cm_rej_reason reason,
2035                    void *ari,
2036                    u8 ari_length,
2037                    const void *private_data,
2038                    u8 private_data_len)
2039 {
2040         struct cm_id_private *cm_id_priv;
2041         struct ib_mad_send_buf *msg;
2042         unsigned long flags;
2043         int ret;
2044
2045         if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
2046             (ari && ari_length > IB_CM_REJ_ARI_LENGTH))
2047                 return -EINVAL;
2048
2049         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2050
2051         spin_lock_irqsave(&cm_id_priv->lock, flags);
2052         switch (cm_id->state) {
2053         case IB_CM_REQ_SENT:
2054         case IB_CM_MRA_REQ_RCVD:
2055         case IB_CM_REQ_RCVD:
2056         case IB_CM_MRA_REQ_SENT:
2057         case IB_CM_REP_RCVD:
2058         case IB_CM_MRA_REP_SENT:
2059                 ret = cm_alloc_msg(cm_id_priv, &msg);
2060                 if (!ret)
2061                         cm_format_rej((struct cm_rej_msg *) msg->mad,
2062                                       cm_id_priv, reason, ari, ari_length,
2063                                       private_data, private_data_len);
2064
2065                 cm_reset_to_idle(cm_id_priv);
2066                 break;
2067         case IB_CM_REP_SENT:
2068         case IB_CM_MRA_REP_RCVD:
2069                 ret = cm_alloc_msg(cm_id_priv, &msg);
2070                 if (!ret)
2071                         cm_format_rej((struct cm_rej_msg *) msg->mad,
2072                                       cm_id_priv, reason, ari, ari_length,
2073                                       private_data, private_data_len);
2074
2075                 cm_enter_timewait(cm_id_priv);
2076                 break;
2077         default:
2078                 ret = -EINVAL;
2079                 goto out;
2080         }
2081
2082         if (ret)
2083                 goto out;
2084
2085         ret = ib_post_send_mad(msg, NULL);
2086         if (ret)
2087                 cm_free_msg(msg);
2088
2089 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2090         return ret;
2091 }
2092 EXPORT_SYMBOL(ib_send_cm_rej);
2093
2094 static void cm_format_rej_event(struct cm_work *work)
2095 {
2096         struct cm_rej_msg *rej_msg;
2097         struct ib_cm_rej_event_param *param;
2098
2099         rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2100         param = &work->cm_event.param.rej_rcvd;
2101         param->ari = rej_msg->ari;
2102         param->ari_length = cm_rej_get_reject_info_len(rej_msg);
2103         param->reason = __be16_to_cpu(rej_msg->reason);
2104         work->cm_event.private_data = &rej_msg->private_data;
2105 }
2106
2107 static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
2108 {
2109         struct cm_timewait_info *timewait_info;
2110         struct cm_id_private *cm_id_priv;
2111         unsigned long flags;
2112         __be32 remote_id;
2113
2114         remote_id = rej_msg->local_comm_id;
2115
2116         if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) {
2117                 spin_lock_irqsave(&cm.lock, flags);
2118                 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari),
2119                                                   remote_id);
2120                 if (!timewait_info) {
2121                         spin_unlock_irqrestore(&cm.lock, flags);
2122                         return NULL;
2123                 }
2124                 cm_id_priv = idr_find(&cm.local_id_table, (__force int)
2125                                       (timewait_info->work.local_id ^
2126                                        cm.random_id_operand));
2127                 if (cm_id_priv) {
2128                         if (cm_id_priv->id.remote_id == remote_id)
2129                                 atomic_inc(&cm_id_priv->refcount);
2130                         else
2131                                 cm_id_priv = NULL;
2132                 }
2133                 spin_unlock_irqrestore(&cm.lock, flags);
2134         } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ)
2135                 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0);
2136         else
2137                 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id);
2138
2139         return cm_id_priv;
2140 }
2141
2142 static int cm_rej_handler(struct cm_work *work)
2143 {
2144         struct cm_id_private *cm_id_priv;
2145         struct cm_rej_msg *rej_msg;
2146         unsigned long flags;
2147         int ret;
2148
2149         rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2150         cm_id_priv = cm_acquire_rejected_id(rej_msg);
2151         if (!cm_id_priv)
2152                 return -EINVAL;
2153
2154         cm_format_rej_event(work);
2155
2156         spin_lock_irqsave(&cm_id_priv->lock, flags);
2157         switch (cm_id_priv->id.state) {
2158         case IB_CM_REQ_SENT:
2159         case IB_CM_MRA_REQ_RCVD:
2160         case IB_CM_REP_SENT:
2161         case IB_CM_MRA_REP_RCVD:
2162                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2163                 /* fall through */
2164         case IB_CM_REQ_RCVD:
2165         case IB_CM_MRA_REQ_SENT:
2166                 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN)
2167                         cm_enter_timewait(cm_id_priv);
2168                 else
2169                         cm_reset_to_idle(cm_id_priv);
2170                 break;
2171         case IB_CM_DREQ_SENT:
2172                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2173                 /* fall through */
2174         case IB_CM_REP_RCVD:
2175         case IB_CM_MRA_REP_SENT:
2176         case IB_CM_ESTABLISHED:
2177                 cm_enter_timewait(cm_id_priv);
2178                 break;
2179         default:
2180                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2181                 ret = -EINVAL;
2182                 goto out;
2183         }
2184
2185         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2186         if (!ret)
2187                 list_add_tail(&work->list, &cm_id_priv->work_list);
2188         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2189
2190         if (ret)
2191                 cm_process_work(cm_id_priv, work);
2192         else
2193                 cm_deref_id(cm_id_priv);
2194         return 0;
2195 out:
2196         cm_deref_id(cm_id_priv);
2197         return -EINVAL;
2198 }
2199
2200 int ib_send_cm_mra(struct ib_cm_id *cm_id,
2201                    u8 service_timeout,
2202                    const void *private_data,
2203                    u8 private_data_len)
2204 {
2205         struct cm_id_private *cm_id_priv;
2206         struct ib_mad_send_buf *msg;
2207         void *data;
2208         unsigned long flags;
2209         int ret;
2210
2211         if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE)
2212                 return -EINVAL;
2213
2214         data = cm_copy_private_data(private_data, private_data_len);
2215         if (IS_ERR(data))
2216                 return PTR_ERR(data);
2217
2218         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2219
2220         spin_lock_irqsave(&cm_id_priv->lock, flags);
2221         switch(cm_id_priv->id.state) {
2222         case IB_CM_REQ_RCVD:
2223                 ret = cm_alloc_msg(cm_id_priv, &msg);
2224                 if (ret)
2225                         goto error1;
2226
2227                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2228                               CM_MSG_RESPONSE_REQ, service_timeout,
2229                               private_data, private_data_len);
2230                 ret = ib_post_send_mad(msg, NULL);
2231                 if (ret)
2232                         goto error2;
2233                 cm_id->state = IB_CM_MRA_REQ_SENT;
2234                 break;
2235         case IB_CM_REP_RCVD:
2236                 ret = cm_alloc_msg(cm_id_priv, &msg);
2237                 if (ret)
2238                         goto error1;
2239
2240                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2241                               CM_MSG_RESPONSE_REP, service_timeout,
2242                               private_data, private_data_len);
2243                 ret = ib_post_send_mad(msg, NULL);
2244                 if (ret)
2245                         goto error2;
2246                 cm_id->state = IB_CM_MRA_REP_SENT;
2247                 break;
2248         case IB_CM_ESTABLISHED:
2249                 ret = cm_alloc_msg(cm_id_priv, &msg);
2250                 if (ret)
2251                         goto error1;
2252
2253                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2254                               CM_MSG_RESPONSE_OTHER, service_timeout,
2255                               private_data, private_data_len);
2256                 ret = ib_post_send_mad(msg, NULL);
2257                 if (ret)
2258                         goto error2;
2259                 cm_id->lap_state = IB_CM_MRA_LAP_SENT;
2260                 break;
2261         default:
2262                 ret = -EINVAL;
2263                 goto error1;
2264         }
2265         cm_id_priv->service_timeout = service_timeout;
2266         cm_set_private_data(cm_id_priv, data, private_data_len);
2267         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2268         return 0;
2269
2270 error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2271         kfree(data);
2272         return ret;
2273
2274 error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2275         kfree(data);
2276         cm_free_msg(msg);
2277         return ret;
2278 }
2279 EXPORT_SYMBOL(ib_send_cm_mra);
2280
2281 static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
2282 {
2283         switch (cm_mra_get_msg_mraed(mra_msg)) {
2284         case CM_MSG_RESPONSE_REQ:
2285                 return cm_acquire_id(mra_msg->remote_comm_id, 0);
2286         case CM_MSG_RESPONSE_REP:
2287         case CM_MSG_RESPONSE_OTHER:
2288                 return cm_acquire_id(mra_msg->remote_comm_id,
2289                                      mra_msg->local_comm_id);
2290         default:
2291                 return NULL;
2292         }
2293 }
2294
2295 static int cm_mra_handler(struct cm_work *work)
2296 {
2297         struct cm_id_private *cm_id_priv;
2298         struct cm_mra_msg *mra_msg;
2299         unsigned long flags;
2300         int timeout, ret;
2301
2302         mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
2303         cm_id_priv = cm_acquire_mraed_id(mra_msg);
2304         if (!cm_id_priv)
2305                 return -EINVAL;
2306
2307         work->cm_event.private_data = &mra_msg->private_data;
2308         work->cm_event.param.mra_rcvd.service_timeout =
2309                                         cm_mra_get_service_timeout(mra_msg);
2310         timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) +
2311                   cm_convert_to_ms(cm_id_priv->av.packet_life_time);
2312
2313         spin_lock_irqsave(&cm_id_priv->lock, flags);
2314         switch (cm_id_priv->id.state) {
2315         case IB_CM_REQ_SENT:
2316                 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ ||
2317                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
2318                                   cm_id_priv->msg, timeout))
2319                         goto out;
2320                 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
2321                 break;
2322         case IB_CM_REP_SENT:
2323                 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP ||
2324                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
2325                                   cm_id_priv->msg, timeout))
2326                         goto out;
2327                 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
2328                 break;
2329         case IB_CM_ESTABLISHED:
2330                 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER ||
2331                     cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
2332                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
2333                                   cm_id_priv->msg, timeout))
2334                         goto out;
2335                 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
2336                 break;
2337         default:
2338                 goto out;
2339         }
2340
2341         cm_id_priv->msg->context[1] = (void *) (unsigned long)
2342                                       cm_id_priv->id.state;
2343         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2344         if (!ret)
2345                 list_add_tail(&work->list, &cm_id_priv->work_list);
2346         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2347
2348         if (ret)
2349                 cm_process_work(cm_id_priv, work);
2350         else
2351                 cm_deref_id(cm_id_priv);
2352         return 0;
2353 out:
2354         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2355         cm_deref_id(cm_id_priv);
2356         return -EINVAL;
2357 }
2358
2359 static void cm_format_lap(struct cm_lap_msg *lap_msg,
2360                           struct cm_id_private *cm_id_priv,
2361                           struct ib_sa_path_rec *alternate_path,
2362                           const void *private_data,
2363                           u8 private_data_len)
2364 {
2365         cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID,
2366                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP));
2367         lap_msg->local_comm_id = cm_id_priv->id.local_id;
2368         lap_msg->remote_comm_id = cm_id_priv->id.remote_id;
2369         cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn);
2370         /* todo: need remote CM response timeout */
2371         cm_lap_set_remote_resp_timeout(lap_msg, 0x1F);
2372         lap_msg->alt_local_lid = alternate_path->slid;
2373         lap_msg->alt_remote_lid = alternate_path->dlid;
2374         lap_msg->alt_local_gid = alternate_path->sgid;
2375         lap_msg->alt_remote_gid = alternate_path->dgid;
2376         cm_lap_set_flow_label(lap_msg, alternate_path->flow_label);
2377         cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class);
2378         lap_msg->alt_hop_limit = alternate_path->hop_limit;
2379         cm_lap_set_packet_rate(lap_msg, alternate_path->rate);
2380         cm_lap_set_sl(lap_msg, alternate_path->sl);
2381         cm_lap_set_subnet_local(lap_msg, 1); /* local only... */
2382         cm_lap_set_local_ack_timeout(lap_msg,
2383                 min(31, alternate_path->packet_life_time + 1));
2384
2385         if (private_data && private_data_len)
2386                 memcpy(lap_msg->private_data, private_data, private_data_len);
2387 }
2388
2389 int ib_send_cm_lap(struct ib_cm_id *cm_id,
2390                    struct ib_sa_path_rec *alternate_path,
2391                    const void *private_data,
2392                    u8 private_data_len)
2393 {
2394         struct cm_id_private *cm_id_priv;
2395         struct ib_mad_send_buf *msg;
2396         unsigned long flags;
2397         int ret;
2398
2399         if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE)
2400                 return -EINVAL;
2401
2402         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2403         spin_lock_irqsave(&cm_id_priv->lock, flags);
2404         if (cm_id->state != IB_CM_ESTABLISHED ||
2405             cm_id->lap_state != IB_CM_LAP_IDLE) {
2406                 ret = -EINVAL;
2407                 goto out;
2408         }
2409
2410         ret = cm_alloc_msg(cm_id_priv, &msg);
2411         if (ret)
2412                 goto out;
2413
2414         cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv,
2415                       alternate_path, private_data, private_data_len);
2416         msg->timeout_ms = cm_id_priv->timeout_ms;
2417         msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED;
2418
2419         ret = ib_post_send_mad(msg, NULL);
2420         if (ret) {
2421                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2422                 cm_free_msg(msg);
2423                 return ret;
2424         }
2425
2426         cm_id->lap_state = IB_CM_LAP_SENT;
2427         cm_id_priv->msg = msg;
2428
2429 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2430         return ret;
2431 }
2432 EXPORT_SYMBOL(ib_send_cm_lap);
2433
2434 static void cm_format_path_from_lap(struct ib_sa_path_rec *path,
2435                                     struct cm_lap_msg *lap_msg)
2436 {
2437         memset(path, 0, sizeof *path);
2438         path->dgid = lap_msg->alt_local_gid;
2439         path->sgid = lap_msg->alt_remote_gid;
2440         path->dlid = lap_msg->alt_local_lid;
2441         path->slid = lap_msg->alt_remote_lid;
2442         path->flow_label = cm_lap_get_flow_label(lap_msg);
2443         path->hop_limit = lap_msg->alt_hop_limit;
2444         path->traffic_class = cm_lap_get_traffic_class(lap_msg);
2445         path->reversible = 1;
2446         /* pkey is same as in REQ */
2447         path->sl = cm_lap_get_sl(lap_msg);
2448         path->mtu_selector = IB_SA_EQ;
2449         /* mtu is same as in REQ */
2450         path->rate_selector = IB_SA_EQ;
2451         path->rate = cm_lap_get_packet_rate(lap_msg);
2452         path->packet_life_time_selector = IB_SA_EQ;
2453         path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg);
2454         path->packet_life_time -= (path->packet_life_time > 0);
2455 }
2456
2457 static int cm_lap_handler(struct cm_work *work)
2458 {
2459         struct cm_id_private *cm_id_priv;
2460         struct cm_lap_msg *lap_msg;
2461         struct ib_cm_lap_event_param *param;
2462         struct ib_mad_send_buf *msg = NULL;
2463         unsigned long flags;
2464         int ret;
2465
2466         /* todo: verify LAP request and send reject APR if invalid. */
2467         lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
2468         cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id,
2469                                    lap_msg->local_comm_id);
2470         if (!cm_id_priv)
2471                 return -EINVAL;
2472
2473         param = &work->cm_event.param.lap_rcvd;
2474         param->alternate_path = &work->path[0];
2475         cm_format_path_from_lap(param->alternate_path, lap_msg);
2476         work->cm_event.private_data = &lap_msg->private_data;
2477
2478         spin_lock_irqsave(&cm_id_priv->lock, flags);
2479         if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
2480                 goto unlock;
2481
2482         switch (cm_id_priv->id.lap_state) {
2483         case IB_CM_LAP_IDLE:
2484                 break;
2485         case IB_CM_MRA_LAP_SENT:
2486                 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2487                         goto unlock;
2488
2489                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2490                               CM_MSG_RESPONSE_OTHER,
2491                               cm_id_priv->service_timeout,
2492                               cm_id_priv->private_data,
2493                               cm_id_priv->private_data_len);
2494                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2495
2496                 if (ib_post_send_mad(msg, NULL))
2497                         cm_free_msg(msg);
2498                 goto deref;
2499         default:
2500                 goto unlock;
2501         }
2502
2503         cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
2504         cm_id_priv->tid = lap_msg->hdr.tid;
2505         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2506         if (!ret)
2507                 list_add_tail(&work->list, &cm_id_priv->work_list);
2508         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2509
2510         if (ret)
2511                 cm_process_work(cm_id_priv, work);
2512         else
2513                 cm_deref_id(cm_id_priv);
2514         return 0;
2515
2516 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2517 deref:  cm_deref_id(cm_id_priv);
2518         return -EINVAL;
2519 }
2520
2521 static void cm_format_apr(struct cm_apr_msg *apr_msg,
2522                           struct cm_id_private *cm_id_priv,
2523                           enum ib_cm_apr_status status,
2524                           void *info,
2525                           u8 info_length,
2526                           const void *private_data,
2527                           u8 private_data_len)
2528 {
2529         cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid);
2530         apr_msg->local_comm_id = cm_id_priv->id.local_id;
2531         apr_msg->remote_comm_id = cm_id_priv->id.remote_id;
2532         apr_msg->ap_status = (u8) status;
2533
2534         if (info && info_length) {
2535                 apr_msg->info_length = info_length;
2536                 memcpy(apr_msg->info, info, info_length);
2537         }
2538
2539         if (private_data && private_data_len)
2540                 memcpy(apr_msg->private_data, private_data, private_data_len);
2541 }
2542
2543 int ib_send_cm_apr(struct ib_cm_id *cm_id,
2544                    enum ib_cm_apr_status status,
2545                    void *info,
2546                    u8 info_length,
2547                    const void *private_data,
2548                    u8 private_data_len)
2549 {
2550         struct cm_id_private *cm_id_priv;
2551         struct ib_mad_send_buf *msg;
2552         unsigned long flags;
2553         int ret;
2554
2555         if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) ||
2556             (info && info_length > IB_CM_APR_INFO_LENGTH))
2557                 return -EINVAL;
2558
2559         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2560         spin_lock_irqsave(&cm_id_priv->lock, flags);
2561         if (cm_id->state != IB_CM_ESTABLISHED ||
2562             (cm_id->lap_state != IB_CM_LAP_RCVD &&
2563              cm_id->lap_state != IB_CM_MRA_LAP_SENT)) {
2564                 ret = -EINVAL;
2565                 goto out;
2566         }
2567
2568         ret = cm_alloc_msg(cm_id_priv, &msg);
2569         if (ret)
2570                 goto out;
2571
2572         cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status,
2573                       info, info_length, private_data, private_data_len);
2574         ret = ib_post_send_mad(msg, NULL);
2575         if (ret) {
2576                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2577                 cm_free_msg(msg);
2578                 return ret;
2579         }
2580
2581         cm_id->lap_state = IB_CM_LAP_IDLE;
2582 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2583         return ret;
2584 }
2585 EXPORT_SYMBOL(ib_send_cm_apr);
2586
2587 static int cm_apr_handler(struct cm_work *work)
2588 {
2589         struct cm_id_private *cm_id_priv;
2590         struct cm_apr_msg *apr_msg;
2591         unsigned long flags;
2592         int ret;
2593
2594         apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
2595         cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id,
2596                                    apr_msg->local_comm_id);
2597         if (!cm_id_priv)
2598                 return -EINVAL; /* Unmatched reply. */
2599
2600         work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status;
2601         work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info;
2602         work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length;
2603         work->cm_event.private_data = &apr_msg->private_data;
2604
2605         spin_lock_irqsave(&cm_id_priv->lock, flags);
2606         if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
2607             (cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
2608              cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
2609                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2610                 goto out;
2611         }
2612         cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
2613         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2614         cm_id_priv->msg = NULL;
2615
2616         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2617         if (!ret)
2618                 list_add_tail(&work->list, &cm_id_priv->work_list);
2619         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2620
2621         if (ret)
2622                 cm_process_work(cm_id_priv, work);
2623         else
2624                 cm_deref_id(cm_id_priv);
2625         return 0;
2626 out:
2627         cm_deref_id(cm_id_priv);
2628         return -EINVAL;
2629 }
2630
2631 static int cm_timewait_handler(struct cm_work *work)
2632 {
2633         struct cm_timewait_info *timewait_info;
2634         struct cm_id_private *cm_id_priv;
2635         int ret;
2636
2637         timewait_info = (struct cm_timewait_info *)work;
2638         spin_lock_irq(&cm.lock);
2639         list_del(&timewait_info->list);
2640         spin_unlock_irq(&cm.lock);
2641
2642         cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
2643                                    timewait_info->work.remote_id);
2644         if (!cm_id_priv)
2645                 return -EINVAL;
2646
2647         spin_lock_irq(&cm_id_priv->lock);
2648         if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
2649             cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
2650                 spin_unlock_irq(&cm_id_priv->lock);
2651                 goto out;
2652         }
2653         cm_id_priv->id.state = IB_CM_IDLE;
2654         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2655         if (!ret)
2656                 list_add_tail(&work->list, &cm_id_priv->work_list);
2657         spin_unlock_irq(&cm_id_priv->lock);
2658
2659         if (ret)
2660                 cm_process_work(cm_id_priv, work);
2661         else
2662                 cm_deref_id(cm_id_priv);
2663         return 0;
2664 out:
2665         cm_deref_id(cm_id_priv);
2666         return -EINVAL;
2667 }
2668
2669 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
2670                                struct cm_id_private *cm_id_priv,
2671                                struct ib_cm_sidr_req_param *param)
2672 {
2673         cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
2674                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR));
2675         sidr_req_msg->request_id = cm_id_priv->id.local_id;
2676         sidr_req_msg->pkey = cpu_to_be16(param->path->pkey);
2677         sidr_req_msg->service_id = param->service_id;
2678
2679         if (param->private_data && param->private_data_len)
2680                 memcpy(sidr_req_msg->private_data, param->private_data,
2681                        param->private_data_len);
2682 }
2683
2684 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
2685                         struct ib_cm_sidr_req_param *param)
2686 {
2687         struct cm_id_private *cm_id_priv;
2688         struct ib_mad_send_buf *msg;
2689         unsigned long flags;
2690         int ret;
2691
2692         if (!param->path || (param->private_data &&
2693              param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
2694                 return -EINVAL;
2695
2696         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2697         ret = cm_init_av_by_path(param->path, &cm_id_priv->av);
2698         if (ret)
2699                 goto out;
2700
2701         cm_id->service_id = param->service_id;
2702         cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
2703         cm_id_priv->timeout_ms = param->timeout_ms;
2704         cm_id_priv->max_cm_retries = param->max_cm_retries;
2705         ret = cm_alloc_msg(cm_id_priv, &msg);
2706         if (ret)
2707                 goto out;
2708
2709         cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv,
2710                            param);
2711         msg->timeout_ms = cm_id_priv->timeout_ms;
2712         msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT;
2713
2714         spin_lock_irqsave(&cm_id_priv->lock, flags);
2715         if (cm_id->state == IB_CM_IDLE)
2716                 ret = ib_post_send_mad(msg, NULL);
2717         else
2718                 ret = -EINVAL;
2719
2720         if (ret) {
2721                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2722                 cm_free_msg(msg);
2723                 goto out;
2724         }
2725         cm_id->state = IB_CM_SIDR_REQ_SENT;
2726         cm_id_priv->msg = msg;
2727         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2728 out:
2729         return ret;
2730 }
2731 EXPORT_SYMBOL(ib_send_cm_sidr_req);
2732
2733 static void cm_format_sidr_req_event(struct cm_work *work,
2734                                      struct ib_cm_id *listen_id)
2735 {
2736         struct cm_sidr_req_msg *sidr_req_msg;
2737         struct ib_cm_sidr_req_event_param *param;
2738
2739         sidr_req_msg = (struct cm_sidr_req_msg *)
2740                                 work->mad_recv_wc->recv_buf.mad;
2741         param = &work->cm_event.param.sidr_req_rcvd;
2742         param->pkey = __be16_to_cpu(sidr_req_msg->pkey);
2743         param->listen_id = listen_id;
2744         param->port = work->port->port_num;
2745         work->cm_event.private_data = &sidr_req_msg->private_data;
2746 }
2747
2748 static int cm_sidr_req_handler(struct cm_work *work)
2749 {
2750         struct ib_cm_id *cm_id;
2751         struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
2752         struct cm_sidr_req_msg *sidr_req_msg;
2753         struct ib_wc *wc;
2754         unsigned long flags;
2755
2756         cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL);
2757         if (IS_ERR(cm_id))
2758                 return PTR_ERR(cm_id);
2759         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2760
2761         /* Record SGID/SLID and request ID for lookup. */
2762         sidr_req_msg = (struct cm_sidr_req_msg *)
2763                                 work->mad_recv_wc->recv_buf.mad;
2764         wc = work->mad_recv_wc->wc;
2765         cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid);
2766         cm_id_priv->av.dgid.global.interface_id = 0;
2767         cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2768                                 work->mad_recv_wc->recv_buf.grh,
2769                                 &cm_id_priv->av);
2770         cm_id_priv->id.remote_id = sidr_req_msg->request_id;
2771         cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
2772         cm_id_priv->tid = sidr_req_msg->hdr.tid;
2773         atomic_inc(&cm_id_priv->work_count);
2774
2775         spin_lock_irqsave(&cm.lock, flags);
2776         cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
2777         if (cur_cm_id_priv) {
2778                 spin_unlock_irqrestore(&cm.lock, flags);
2779                 goto out; /* Duplicate message. */
2780         }
2781         cur_cm_id_priv = cm_find_listen(cm_id->device,
2782                                         sidr_req_msg->service_id,
2783                                         sidr_req_msg->private_data);
2784         if (!cur_cm_id_priv) {
2785                 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
2786                 spin_unlock_irqrestore(&cm.lock, flags);
2787                 /* todo: reply with no match */
2788                 goto out; /* No match. */
2789         }
2790         atomic_inc(&cur_cm_id_priv->refcount);
2791         spin_unlock_irqrestore(&cm.lock, flags);
2792
2793         cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler;
2794         cm_id_priv->id.context = cur_cm_id_priv->id.context;
2795         cm_id_priv->id.service_id = sidr_req_msg->service_id;
2796         cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL);
2797
2798         cm_format_sidr_req_event(work, &cur_cm_id_priv->id);
2799         cm_process_work(cm_id_priv, work);
2800         cm_deref_id(cur_cm_id_priv);
2801         return 0;
2802 out:
2803         ib_destroy_cm_id(&cm_id_priv->id);
2804         return -EINVAL;
2805 }
2806
2807 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
2808                                struct cm_id_private *cm_id_priv,
2809                                struct ib_cm_sidr_rep_param *param)
2810 {
2811         cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
2812                           cm_id_priv->tid);
2813         sidr_rep_msg->request_id = cm_id_priv->id.remote_id;
2814         sidr_rep_msg->status = param->status;
2815         cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num));
2816         sidr_rep_msg->service_id = cm_id_priv->id.service_id;
2817         sidr_rep_msg->qkey = cpu_to_be32(param->qkey);
2818
2819         if (param->info && param->info_length)
2820                 memcpy(sidr_rep_msg->info, param->info, param->info_length);
2821
2822         if (param->private_data && param->private_data_len)
2823                 memcpy(sidr_rep_msg->private_data, param->private_data,
2824                        param->private_data_len);
2825 }
2826
2827 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
2828                         struct ib_cm_sidr_rep_param *param)
2829 {
2830         struct cm_id_private *cm_id_priv;
2831         struct ib_mad_send_buf *msg;
2832         unsigned long flags;
2833         int ret;
2834
2835         if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
2836             (param->private_data &&
2837              param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE))
2838                 return -EINVAL;
2839
2840         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2841         spin_lock_irqsave(&cm_id_priv->lock, flags);
2842         if (cm_id->state != IB_CM_SIDR_REQ_RCVD) {
2843                 ret = -EINVAL;
2844                 goto error;
2845         }
2846
2847         ret = cm_alloc_msg(cm_id_priv, &msg);
2848         if (ret)
2849                 goto error;
2850
2851         cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
2852                            param);
2853         ret = ib_post_send_mad(msg, NULL);
2854         if (ret) {
2855                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2856                 cm_free_msg(msg);
2857                 return ret;
2858         }
2859         cm_id->state = IB_CM_IDLE;
2860         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2861
2862         spin_lock_irqsave(&cm.lock, flags);
2863         rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
2864         spin_unlock_irqrestore(&cm.lock, flags);
2865         return 0;
2866
2867 error:  spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2868         return ret;
2869 }
2870 EXPORT_SYMBOL(ib_send_cm_sidr_rep);
2871
2872 static void cm_format_sidr_rep_event(struct cm_work *work)
2873 {
2874         struct cm_sidr_rep_msg *sidr_rep_msg;
2875         struct ib_cm_sidr_rep_event_param *param;
2876
2877         sidr_rep_msg = (struct cm_sidr_rep_msg *)
2878                                 work->mad_recv_wc->recv_buf.mad;
2879         param = &work->cm_event.param.sidr_rep_rcvd;
2880         param->status = sidr_rep_msg->status;
2881         param->qkey = be32_to_cpu(sidr_rep_msg->qkey);
2882         param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg));
2883         param->info = &sidr_rep_msg->info;
2884         param->info_len = sidr_rep_msg->info_length;
2885         work->cm_event.private_data = &sidr_rep_msg->private_data;
2886 }
2887
2888 static int cm_sidr_rep_handler(struct cm_work *work)
2889 {
2890         struct cm_sidr_rep_msg *sidr_rep_msg;
2891         struct cm_id_private *cm_id_priv;
2892         unsigned long flags;
2893
2894         sidr_rep_msg = (struct cm_sidr_rep_msg *)
2895                                 work->mad_recv_wc->recv_buf.mad;
2896         cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0);
2897         if (!cm_id_priv)
2898                 return -EINVAL; /* Unmatched reply. */
2899
2900         spin_lock_irqsave(&cm_id_priv->lock, flags);
2901         if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
2902                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2903                 goto out;
2904         }
2905         cm_id_priv->id.state = IB_CM_IDLE;
2906         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2907         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2908
2909         cm_format_sidr_rep_event(work);
2910         cm_process_work(cm_id_priv, work);
2911         return 0;
2912 out:
2913         cm_deref_id(cm_id_priv);
2914         return -EINVAL;
2915 }
2916
2917 static void cm_process_send_error(struct ib_mad_send_buf *msg,
2918                                   enum ib_wc_status wc_status)
2919 {
2920         struct cm_id_private *cm_id_priv;
2921         struct ib_cm_event cm_event;
2922         enum ib_cm_state state;
2923         unsigned long flags;
2924         int ret;
2925
2926         memset(&cm_event, 0, sizeof cm_event);
2927         cm_id_priv = msg->context[0];
2928
2929         /* Discard old sends or ones without a response. */
2930         spin_lock_irqsave(&cm_id_priv->lock, flags);
2931         state = (enum ib_cm_state) (unsigned long) msg->context[1];
2932         if (msg != cm_id_priv->msg || state != cm_id_priv->id.state)
2933                 goto discard;
2934
2935         switch (state) {
2936         case IB_CM_REQ_SENT:
2937         case IB_CM_MRA_REQ_RCVD:
2938                 cm_reset_to_idle(cm_id_priv);
2939                 cm_event.event = IB_CM_REQ_ERROR;
2940                 break;
2941         case IB_CM_REP_SENT:
2942         case IB_CM_MRA_REP_RCVD:
2943                 cm_reset_to_idle(cm_id_priv);
2944                 cm_event.event = IB_CM_REP_ERROR;
2945                 break;
2946         case IB_CM_DREQ_SENT:
2947                 cm_enter_timewait(cm_id_priv);
2948                 cm_event.event = IB_CM_DREQ_ERROR;
2949                 break;
2950         case IB_CM_SIDR_REQ_SENT:
2951                 cm_id_priv->id.state = IB_CM_IDLE;
2952                 cm_event.event = IB_CM_SIDR_REQ_ERROR;
2953                 break;
2954         default:
2955                 goto discard;
2956         }
2957         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2958         cm_event.param.send_status = wc_status;
2959
2960         /* No other events can occur on the cm_id at this point. */
2961         ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
2962         cm_free_msg(msg);
2963         if (ret)
2964                 ib_destroy_cm_id(&cm_id_priv->id);
2965         return;
2966 discard:
2967         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2968         cm_free_msg(msg);
2969 }
2970
2971 static void cm_send_handler(struct ib_mad_agent *mad_agent,
2972                             struct ib_mad_send_wc *mad_send_wc)
2973 {
2974         struct ib_mad_send_buf *msg = mad_send_wc->send_buf;
2975
2976         switch (mad_send_wc->status) {
2977         case IB_WC_SUCCESS:
2978         case IB_WC_WR_FLUSH_ERR:
2979                 cm_free_msg(msg);
2980                 break;
2981         default:
2982                 if (msg->context[0] && msg->context[1])
2983                         cm_process_send_error(msg, mad_send_wc->status);
2984                 else
2985                         cm_free_msg(msg);
2986                 break;
2987         }
2988 }
2989
2990 static void cm_work_handler(void *data)
2991 {
2992         struct cm_work *work = data;
2993         int ret;
2994
2995         switch (work->cm_event.event) {
2996         case IB_CM_REQ_RECEIVED:
2997                 ret = cm_req_handler(work);
2998                 break;
2999         case IB_CM_MRA_RECEIVED:
3000                 ret = cm_mra_handler(work);
3001                 break;
3002         case IB_CM_REJ_RECEIVED:
3003                 ret = cm_rej_handler(work);
3004                 break;
3005         case IB_CM_REP_RECEIVED:
3006                 ret = cm_rep_handler(work);
3007                 break;
3008         case IB_CM_RTU_RECEIVED:
3009                 ret = cm_rtu_handler(work);
3010                 break;
3011         case IB_CM_USER_ESTABLISHED:
3012                 ret = cm_establish_handler(work);
3013                 break;
3014         case IB_CM_DREQ_RECEIVED:
3015                 ret = cm_dreq_handler(work);
3016                 break;
3017         case IB_CM_DREP_RECEIVED:
3018                 ret = cm_drep_handler(work);
3019                 break;
3020         case IB_CM_SIDR_REQ_RECEIVED:
3021                 ret = cm_sidr_req_handler(work);
3022                 break;
3023         case IB_CM_SIDR_REP_RECEIVED:
3024                 ret = cm_sidr_rep_handler(work);
3025                 break;
3026         case IB_CM_LAP_RECEIVED:
3027                 ret = cm_lap_handler(work);
3028                 break;
3029         case IB_CM_APR_RECEIVED:
3030                 ret = cm_apr_handler(work);
3031                 break;
3032         case IB_CM_TIMEWAIT_EXIT:
3033                 ret = cm_timewait_handler(work);
3034                 break;
3035         default:
3036                 ret = -EINVAL;
3037                 break;
3038         }
3039         if (ret)
3040                 cm_free_work(work);
3041 }
3042
3043 int ib_cm_establish(struct ib_cm_id *cm_id)
3044 {
3045         struct cm_id_private *cm_id_priv;
3046         struct cm_work *work;
3047         unsigned long flags;
3048         int ret = 0;
3049
3050         work = kmalloc(sizeof *work, GFP_ATOMIC);
3051         if (!work)
3052                 return -ENOMEM;
3053
3054         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3055         spin_lock_irqsave(&cm_id_priv->lock, flags);
3056         switch (cm_id->state)
3057         {
3058         case IB_CM_REP_SENT:
3059         case IB_CM_MRA_REP_RCVD:
3060                 cm_id->state = IB_CM_ESTABLISHED;
3061                 break;
3062         case IB_CM_ESTABLISHED:
3063                 ret = -EISCONN;
3064                 break;
3065         default:
3066                 ret = -EINVAL;
3067                 break;
3068         }
3069         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3070
3071         if (ret) {
3072                 kfree(work);
3073                 goto out;
3074         }
3075
3076         /*
3077          * The CM worker thread may try to destroy the cm_id before it
3078          * can execute this work item.  To prevent potential deadlock,
3079          * we need to find the cm_id once we're in the context of the
3080          * worker thread, rather than holding a reference on it.
3081          */
3082         INIT_WORK(&work->work, cm_work_handler, work);
3083         work->local_id = cm_id->local_id;
3084         work->remote_id = cm_id->remote_id;
3085         work->mad_recv_wc = NULL;
3086         work->cm_event.event = IB_CM_USER_ESTABLISHED;
3087         queue_work(cm.wq, &work->work);
3088 out:
3089         return ret;
3090 }
3091 EXPORT_SYMBOL(ib_cm_establish);
3092
3093 static void cm_recv_handler(struct ib_mad_agent *mad_agent,
3094                             struct ib_mad_recv_wc *mad_recv_wc)
3095 {
3096         struct cm_work *work;
3097         enum ib_cm_event_type event;
3098         int paths = 0;
3099
3100         switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
3101         case CM_REQ_ATTR_ID:
3102                 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)->
3103                                                     alt_local_lid != 0);
3104                 event = IB_CM_REQ_RECEIVED;
3105                 break;
3106         case CM_MRA_ATTR_ID:
3107                 event = IB_CM_MRA_RECEIVED;
3108                 break;
3109         case CM_REJ_ATTR_ID:
3110                 event = IB_CM_REJ_RECEIVED;
3111                 break;
3112         case CM_REP_ATTR_ID:
3113                 event = IB_CM_REP_RECEIVED;
3114                 break;
3115         case CM_RTU_ATTR_ID:
3116                 event = IB_CM_RTU_RECEIVED;
3117                 break;
3118         case CM_DREQ_ATTR_ID:
3119                 event = IB_CM_DREQ_RECEIVED;
3120                 break;
3121         case CM_DREP_ATTR_ID:
3122                 event = IB_CM_DREP_RECEIVED;
3123                 break;
3124         case CM_SIDR_REQ_ATTR_ID:
3125                 event = IB_CM_SIDR_REQ_RECEIVED;
3126                 break;
3127         case CM_SIDR_REP_ATTR_ID:
3128                 event = IB_CM_SIDR_REP_RECEIVED;
3129                 break;
3130         case CM_LAP_ATTR_ID:
3131                 paths = 1;
3132                 event = IB_CM_LAP_RECEIVED;
3133                 break;
3134         case CM_APR_ATTR_ID:
3135                 event = IB_CM_APR_RECEIVED;
3136                 break;
3137         default:
3138                 ib_free_recv_mad(mad_recv_wc);
3139                 return;
3140         }
3141
3142         work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths,
3143                        GFP_KERNEL);
3144         if (!work) {
3145                 ib_free_recv_mad(mad_recv_wc);
3146                 return;
3147         }
3148
3149         INIT_WORK(&work->work, cm_work_handler, work);
3150         work->cm_event.event = event;
3151         work->mad_recv_wc = mad_recv_wc;
3152         work->port = (struct cm_port *)mad_agent->context;
3153         queue_work(cm.wq, &work->work);
3154 }
3155
3156 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
3157                                 struct ib_qp_attr *qp_attr,
3158                                 int *qp_attr_mask)
3159 {
3160         unsigned long flags;
3161         int ret;
3162
3163         spin_lock_irqsave(&cm_id_priv->lock, flags);
3164         switch (cm_id_priv->id.state) {
3165         case IB_CM_REQ_SENT:
3166         case IB_CM_MRA_REQ_RCVD:
3167         case IB_CM_REQ_RCVD:
3168         case IB_CM_MRA_REQ_SENT:
3169         case IB_CM_REP_RCVD:
3170         case IB_CM_MRA_REP_SENT:
3171         case IB_CM_REP_SENT:
3172         case IB_CM_MRA_REP_RCVD:
3173         case IB_CM_ESTABLISHED:
3174                 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
3175                                 IB_QP_PKEY_INDEX | IB_QP_PORT;
3176                 qp_attr->qp_access_flags = IB_ACCESS_LOCAL_WRITE |
3177                                            IB_ACCESS_REMOTE_WRITE;
3178                 if (cm_id_priv->responder_resources)
3179                         qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ |
3180                                                     IB_ACCESS_REMOTE_ATOMIC;
3181                 qp_attr->pkey_index = cm_id_priv->av.pkey_index;
3182                 qp_attr->port_num = cm_id_priv->av.port->port_num;
3183                 ret = 0;
3184                 break;
3185         default:
3186                 ret = -EINVAL;
3187                 break;
3188         }
3189         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3190         return ret;
3191 }
3192
3193 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
3194                                struct ib_qp_attr *qp_attr,
3195                                int *qp_attr_mask)
3196 {
3197         unsigned long flags;
3198         int ret;
3199
3200         spin_lock_irqsave(&cm_id_priv->lock, flags);
3201         switch (cm_id_priv->id.state) {
3202         case IB_CM_REQ_RCVD:
3203         case IB_CM_MRA_REQ_SENT:
3204         case IB_CM_REP_RCVD:
3205         case IB_CM_MRA_REP_SENT:
3206         case IB_CM_REP_SENT:
3207         case IB_CM_MRA_REP_RCVD:
3208         case IB_CM_ESTABLISHED:
3209                 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
3210                                 IB_QP_DEST_QPN | IB_QP_RQ_PSN;
3211                 qp_attr->ah_attr = cm_id_priv->av.ah_attr;
3212                 qp_attr->path_mtu = cm_id_priv->path_mtu;
3213                 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
3214                 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
3215                 if (cm_id_priv->qp_type == IB_QPT_RC) {
3216                         *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC |
3217                                          IB_QP_MIN_RNR_TIMER;
3218                         qp_attr->max_dest_rd_atomic =
3219                                         cm_id_priv->responder_resources;
3220                         qp_attr->min_rnr_timer = 0;
3221                 }
3222                 if (cm_id_priv->alt_av.ah_attr.dlid) {
3223                         *qp_attr_mask |= IB_QP_ALT_PATH;
3224                         qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
3225                         qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3226                 }
3227                 ret = 0;
3228                 break;
3229         default:
3230                 ret = -EINVAL;
3231                 break;
3232         }
3233         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3234         return ret;
3235 }
3236
3237 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv,
3238                                struct ib_qp_attr *qp_attr,
3239                                int *qp_attr_mask)
3240 {
3241         unsigned long flags;
3242         int ret;
3243
3244         spin_lock_irqsave(&cm_id_priv->lock, flags);
3245         switch (cm_id_priv->id.state) {
3246         case IB_CM_REP_RCVD:
3247         case IB_CM_MRA_REP_SENT:
3248         case IB_CM_REP_SENT:
3249         case IB_CM_MRA_REP_RCVD:
3250         case IB_CM_ESTABLISHED:
3251                 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN;
3252                 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn);
3253                 if (cm_id_priv->qp_type == IB_QPT_RC) {
3254                         *qp_attr_mask |= IB_QP_TIMEOUT | IB_QP_RETRY_CNT |
3255                                          IB_QP_RNR_RETRY |
3256                                          IB_QP_MAX_QP_RD_ATOMIC;
3257                         qp_attr->timeout = cm_id_priv->local_ack_timeout;
3258                         qp_attr->retry_cnt = cm_id_priv->retry_count;
3259                         qp_attr->rnr_retry = cm_id_priv->rnr_retry_count;
3260                         qp_attr->max_rd_atomic = cm_id_priv->initiator_depth;
3261                 }
3262                 if (cm_id_priv->alt_av.ah_attr.dlid) {
3263                         *qp_attr_mask |= IB_QP_PATH_MIG_STATE;
3264                         qp_attr->path_mig_state = IB_MIG_REARM;
3265                 }
3266                 ret = 0;
3267                 break;
3268         default:
3269                 ret = -EINVAL;
3270                 break;
3271         }
3272         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3273         return ret;
3274 }
3275
3276 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
3277                        struct ib_qp_attr *qp_attr,
3278                        int *qp_attr_mask)
3279 {
3280         struct cm_id_private *cm_id_priv;
3281         int ret;
3282
3283         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3284         switch (qp_attr->qp_state) {
3285         case IB_QPS_INIT:
3286                 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask);
3287                 break;
3288         case IB_QPS_RTR:
3289                 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask);
3290                 break;
3291         case IB_QPS_RTS:
3292                 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask);
3293                 break;
3294         default:
3295                 ret = -EINVAL;
3296                 break;
3297         }
3298         return ret;
3299 }
3300 EXPORT_SYMBOL(ib_cm_init_qp_attr);
3301
3302 static void cm_add_one(struct ib_device *device)
3303 {
3304         struct cm_device *cm_dev;
3305         struct cm_port *port;
3306         struct ib_mad_reg_req reg_req = {
3307                 .mgmt_class = IB_MGMT_CLASS_CM,
3308                 .mgmt_class_version = IB_CM_CLASS_VERSION
3309         };
3310         struct ib_port_modify port_modify = {
3311                 .set_port_cap_mask = IB_PORT_CM_SUP
3312         };
3313         unsigned long flags;
3314         int ret;
3315         u8 i;
3316
3317         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
3318                 return;
3319
3320         cm_dev = kmalloc(sizeof(*cm_dev) + sizeof(*port) *
3321                          device->phys_port_cnt, GFP_KERNEL);
3322         if (!cm_dev)
3323                 return;
3324
3325         cm_dev->device = device;
3326         cm_dev->ca_guid = device->node_guid;
3327
3328         set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
3329         for (i = 1; i <= device->phys_port_cnt; i++) {
3330                 port = &cm_dev->port[i-1];
3331                 port->cm_dev = cm_dev;
3332                 port->port_num = i;
3333                 port->mad_agent = ib_register_mad_agent(device, i,
3334                                                         IB_QPT_GSI,
3335                                                         &reg_req,
3336                                                         0,
3337                                                         cm_send_handler,
3338                                                         cm_recv_handler,
3339                                                         port);
3340                 if (IS_ERR(port->mad_agent))
3341                         goto error1;
3342
3343                 ret = ib_modify_port(device, i, 0, &port_modify);
3344                 if (ret)
3345                         goto error2;
3346         }
3347         ib_set_client_data(device, &cm_client, cm_dev);
3348
3349         write_lock_irqsave(&cm.device_lock, flags);
3350         list_add_tail(&cm_dev->list, &cm.device_list);
3351         write_unlock_irqrestore(&cm.device_lock, flags);
3352         return;
3353
3354 error2:
3355         ib_unregister_mad_agent(port->mad_agent);
3356 error1:
3357         port_modify.set_port_cap_mask = 0;
3358         port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
3359         while (--i) {
3360                 port = &cm_dev->port[i-1];
3361                 ib_modify_port(device, port->port_num, 0, &port_modify);
3362                 ib_unregister_mad_agent(port->mad_agent);
3363         }
3364         kfree(cm_dev);
3365 }
3366
3367 static void cm_remove_one(struct ib_device *device)
3368 {
3369         struct cm_device *cm_dev;
3370         struct cm_port *port;
3371         struct ib_port_modify port_modify = {
3372                 .clr_port_cap_mask = IB_PORT_CM_SUP
3373         };
3374         unsigned long flags;
3375         int i;
3376
3377         cm_dev = ib_get_client_data(device, &cm_client);
3378         if (!cm_dev)
3379                 return;
3380
3381         write_lock_irqsave(&cm.device_lock, flags);
3382         list_del(&cm_dev->list);
3383         write_unlock_irqrestore(&cm.device_lock, flags);
3384
3385         for (i = 1; i <= device->phys_port_cnt; i++) {
3386                 port = &cm_dev->port[i-1];
3387                 ib_modify_port(device, port->port_num, 0, &port_modify);
3388                 ib_unregister_mad_agent(port->mad_agent);
3389         }
3390         kfree(cm_dev);
3391 }
3392
3393 static int __init ib_cm_init(void)
3394 {
3395         int ret;
3396
3397         memset(&cm, 0, sizeof cm);
3398         INIT_LIST_HEAD(&cm.device_list);
3399         rwlock_init(&cm.device_lock);
3400         spin_lock_init(&cm.lock);
3401         cm.listen_service_table = RB_ROOT;
3402         cm.listen_service_id = __constant_be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID);
3403         cm.remote_id_table = RB_ROOT;
3404         cm.remote_qp_table = RB_ROOT;
3405         cm.remote_sidr_table = RB_ROOT;
3406         idr_init(&cm.local_id_table);
3407         get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand);
3408         idr_pre_get(&cm.local_id_table, GFP_KERNEL);
3409         INIT_LIST_HEAD(&cm.timewait_list);
3410
3411         cm.wq = create_workqueue("ib_cm");
3412         if (!cm.wq)
3413                 return -ENOMEM;
3414
3415         ret = ib_register_client(&cm_client);
3416         if (ret)
3417                 goto error;
3418
3419         return 0;
3420 error:
3421         destroy_workqueue(cm.wq);
3422         return ret;
3423 }
3424
3425 static void __exit ib_cm_cleanup(void)
3426 {
3427         struct cm_timewait_info *timewait_info, *tmp;
3428
3429         spin_lock_irq(&cm.lock);
3430         list_for_each_entry(timewait_info, &cm.timewait_list, list)
3431                 cancel_delayed_work(&timewait_info->work.work);
3432         spin_unlock_irq(&cm.lock);
3433
3434         destroy_workqueue(cm.wq);
3435
3436         list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) {
3437                 list_del(&timewait_info->list);
3438                 kfree(timewait_info);
3439         }
3440
3441         ib_unregister_client(&cm_client);
3442         idr_destroy(&cm.local_id_table);
3443 }
3444
3445 module_init(ib_cm_init);
3446 module_exit(ib_cm_cleanup);
3447