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

   1 /*
   2  * Copyright (c) 2004-2006 Intel Corporation.  All rights reserved.
   3  * Copyright (c) 2004 Topspin Corporation.  All rights reserved.
   4  * Copyright (c) 2004, 2005 Voltaire Corporation.  All rights reserved.
   5  * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
   6  *
   7  * This software is available to you under a choice of one of two
   8  * licenses.  You may choose to be licensed under the terms of the GNU
   9  * General Public License (GPL) Version 2, available from the file
  10  * COPYING in the main directory of this source tree, or the
  11  * OpenIB.org BSD license below:
  12  *
  13  *     Redistribution and use in source and binary forms, with or
  14  *     without modification, are permitted provided that the following
  15  *     conditions are met:
  16  *
  17  *      - Redistributions of source code must retain the above
  18  *        copyright notice, this list of conditions and the following
  19  *        disclaimer.
  20  *
  21  *      - Redistributions in binary form must reproduce the above
  22  *        copyright notice, this list of conditions and the following
  23  *        disclaimer in the documentation and/or other materials
  24  *        provided with the distribution.
  25  *
  26  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  27  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  28  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  29  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  30  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  31  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  32  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  33  * SOFTWARE.
  34  *
  35  * $Id: cm.c 4311 2005-12-05 18:42:01Z sean.hefty $
  36  */
  37
  38 #include <linux/completion.h>
  39 #include <linux/dma-mapping.h>
  40 #include <linux/err.h>
  41 #include <linux/idr.h>
  42 #include <linux/interrupt.h>
  43 #include <linux/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 delayed_work 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         __be16 pkey;
 151         u8 private_data_len;
 152         u8 max_cm_retries;
 153         u8 peer_to_peer;
 154         u8 responder_resources;
 155         u8 initiator_depth;
 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(struct work_struct *work);
 165
 166 static inline void cm_deref_id(struct cm_id_private *cm_id_priv)
 167 {
 168         if (atomic_dec_and_test(&cm_id_priv->refcount))
 169                 complete(&cm_id_priv->comp);
 170 }
 171
 172 static int cm_alloc_msg(struct cm_id_private *cm_id_priv,
 173                         struct ib_mad_send_buf **msg)
 174 {
 175         struct ib_mad_agent *mad_agent;
 176         struct ib_mad_send_buf *m;
 177         struct ib_ah *ah;
 178
 179         mad_agent = cm_id_priv->av.port->mad_agent;
 180         ah = ib_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr);
 181         if (IS_ERR(ah))
 182                 return PTR_ERR(ah);
 183
 184         m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn,
 185                                cm_id_priv->av.pkey_index,
 186                                0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
 187                                GFP_ATOMIC);
 188         if (IS_ERR(m)) {
 189                 ib_destroy_ah(ah);
 190                 return PTR_ERR(m);
 191         }
 192
 193         /* Timeout set by caller if response is expected. */
 194         m->ah = ah;
 195         m->retries = cm_id_priv->max_cm_retries;
 196
 197         atomic_inc(&cm_id_priv->refcount);
 198         m->context[0] = cm_id_priv;
 199         *msg = m;
 200         return 0;
 201 }
 202
 203 static int cm_alloc_response_msg(struct cm_port *port,
 204                                  struct ib_mad_recv_wc *mad_recv_wc,
 205                                  struct ib_mad_send_buf **msg)
 206 {
 207         struct ib_mad_send_buf *m;
 208         struct ib_ah *ah;
 209
 210         ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc,
 211                                   mad_recv_wc->recv_buf.grh, port->port_num);
 212         if (IS_ERR(ah))
 213                 return PTR_ERR(ah);
 214
 215         m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index,
 216                                0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
 217                                GFP_ATOMIC);
 218         if (IS_ERR(m)) {
 219                 ib_destroy_ah(ah);
 220                 return PTR_ERR(m);
 221         }
 222         m->ah = ah;
 223         *msg = m;
 224         return 0;
 225 }
 226
 227 static void cm_free_msg(struct ib_mad_send_buf *msg)
 228 {
 229         ib_destroy_ah(msg->ah);
 230         if (msg->context[0])
 231                 cm_deref_id(msg->context[0]);
 232         ib_free_send_mad(msg);
 233 }
 234
 235 static void * cm_copy_private_data(const void *private_data,
 236                                    u8 private_data_len)
 237 {
 238         void *data;
 239
 240         if (!private_data || !private_data_len)
 241                 return NULL;
 242
 243         data = kmemdup(private_data, private_data_len, GFP_KERNEL);
 244         if (!data)
 245                 return ERR_PTR(-ENOMEM);
 246
 247         return data;
 248 }
 249
 250 static void cm_set_private_data(struct cm_id_private *cm_id_priv,
 251                                  void *private_data, u8 private_data_len)
 252 {
 253         if (cm_id_priv->private_data && cm_id_priv->private_data_len)
 254                 kfree(cm_id_priv->private_data);
 255
 256         cm_id_priv->private_data = private_data;
 257         cm_id_priv->private_data_len = private_data_len;
 258 }
 259
 260 static void cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc,
 261                                     struct ib_grh *grh, struct cm_av *av)
 262 {
 263         av->port = port;
 264         av->pkey_index = wc->pkey_index;
 265         ib_init_ah_from_wc(port->cm_dev->device, port->port_num, wc,
 266                            grh, &av->ah_attr);
 267 }
 268
 269 static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av)
 270 {
 271         struct cm_device *cm_dev;
 272         struct cm_port *port = NULL;
 273         unsigned long flags;
 274         int ret;
 275         u8 p;
 276
 277         read_lock_irqsave(&cm.device_lock, flags);
 278         list_for_each_entry(cm_dev, &cm.device_list, list) {
 279                 if (!ib_find_cached_gid(cm_dev->device, &path->sgid,
 280                                         &p, NULL)) {
 281                         port = &cm_dev->port[p-1];
 282                         break;
 283                 }
 284         }
 285         read_unlock_irqrestore(&cm.device_lock, flags);
 286
 287         if (!port)
 288                 return -EINVAL;
 289
 290         ret = ib_find_cached_pkey(cm_dev->device, port->port_num,
 291                                   be16_to_cpu(path->pkey), &av->pkey_index);
 292         if (ret)
 293                 return ret;
 294
 295         av->port = port;
 296         ib_init_ah_from_path(cm_dev->device, port->port_num, path,
 297                              &av->ah_attr);
 298         av->packet_life_time = path->packet_life_time;
 299         return 0;
 300 }
 301
 302 static int cm_alloc_id(struct cm_id_private *cm_id_priv)
 303 {
 304         unsigned long flags;
 305         int ret, id;
 306         static int next_id;
 307
 308         do {
 309                 spin_lock_irqsave(&cm.lock, flags);
 310                 ret = idr_get_new_above(&cm.local_id_table, cm_id_priv,
 311                                         next_id++, &id);
 312                 spin_unlock_irqrestore(&cm.lock, flags);
 313         } while( (ret == -EAGAIN) && idr_pre_get(&cm.local_id_table, GFP_KERNEL) );
 314
 315         cm_id_priv->id.local_id = (__force __be32) (id ^ cm.random_id_operand);
 316         return ret;
 317 }
 318
 319 static void cm_free_id(__be32 local_id)
 320 {
 321         unsigned long flags;
 322
 323         spin_lock_irqsave(&cm.lock, flags);
 324         idr_remove(&cm.local_id_table,
 325                    (__force int) (local_id ^ cm.random_id_operand));
 326         spin_unlock_irqrestore(&cm.lock, flags);
 327 }
 328
 329 static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id)
 330 {
 331         struct cm_id_private *cm_id_priv;
 332
 333         cm_id_priv = idr_find(&cm.local_id_table,
 334                               (__force int) (local_id ^ cm.random_id_operand));
 335         if (cm_id_priv) {
 336                 if (cm_id_priv->id.remote_id == remote_id)
 337                         atomic_inc(&cm_id_priv->refcount);
 338                 else
 339                         cm_id_priv = NULL;
 340         }
 341
 342         return cm_id_priv;
 343 }
 344
 345 static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id)
 346 {
 347         struct cm_id_private *cm_id_priv;
 348         unsigned long flags;
 349
 350         spin_lock_irqsave(&cm.lock, flags);
 351         cm_id_priv = cm_get_id(local_id, remote_id);
 352         spin_unlock_irqrestore(&cm.lock, flags);
 353
 354         return cm_id_priv;
 355 }
 356
 357 static void cm_mask_copy(u8 *dst, u8 *src, u8 *mask)
 358 {
 359         int i;
 360
 361         for (i = 0; i < IB_CM_COMPARE_SIZE / sizeof(unsigned long); i++)
 362                 ((unsigned long *) dst)[i] = ((unsigned long *) src)[i] &
 363                                              ((unsigned long *) mask)[i];
 364 }
 365
 366 static int cm_compare_data(struct ib_cm_compare_data *src_data,
 367                            struct ib_cm_compare_data *dst_data)
 368 {
 369         u8 src[IB_CM_COMPARE_SIZE];
 370         u8 dst[IB_CM_COMPARE_SIZE];
 371
 372         if (!src_data || !dst_data)
 373                 return 0;
 374
 375         cm_mask_copy(src, src_data->data, dst_data->mask);
 376         cm_mask_copy(dst, dst_data->data, src_data->mask);
 377         return memcmp(src, dst, IB_CM_COMPARE_SIZE);
 378 }
 379
 380 static int cm_compare_private_data(u8 *private_data,
 381                                    struct ib_cm_compare_data *dst_data)
 382 {
 383         u8 src[IB_CM_COMPARE_SIZE];
 384
 385         if (!dst_data)
 386                 return 0;
 387
 388         cm_mask_copy(src, private_data, dst_data->mask);
 389         return memcmp(src, dst_data->data, IB_CM_COMPARE_SIZE);
 390 }
 391
 392 static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv)
 393 {
 394         struct rb_node **link = &cm.listen_service_table.rb_node;
 395         struct rb_node *parent = NULL;
 396         struct cm_id_private *cur_cm_id_priv;
 397         __be64 service_id = cm_id_priv->id.service_id;
 398         __be64 service_mask = cm_id_priv->id.service_mask;
 399         int data_cmp;
 400
 401         while (*link) {
 402                 parent = *link;
 403                 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
 404                                           service_node);
 405                 data_cmp = cm_compare_data(cm_id_priv->compare_data,
 406                                            cur_cm_id_priv->compare_data);
 407                 if ((cur_cm_id_priv->id.service_mask & service_id) ==
 408                     (service_mask & cur_cm_id_priv->id.service_id) &&
 409                     (cm_id_priv->id.device == cur_cm_id_priv->id.device) &&
 410                     !data_cmp)
 411                         return cur_cm_id_priv;
 412
 413                 if (cm_id_priv->id.device < cur_cm_id_priv->id.device)
 414                         link = &(*link)->rb_left;
 415                 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device)
 416                         link = &(*link)->rb_right;
 417                 else if (service_id < cur_cm_id_priv->id.service_id)
 418                         link = &(*link)->rb_left;
 419                 else if (service_id > cur_cm_id_priv->id.service_id)
 420                         link = &(*link)->rb_right;
 421                 else if (data_cmp < 0)
 422                         link = &(*link)->rb_left;
 423                 else
 424                         link = &(*link)->rb_right;
 425         }
 426         rb_link_node(&cm_id_priv->service_node, parent, link);
 427         rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table);
 428         return NULL;
 429 }
 430
 431 static struct cm_id_private * cm_find_listen(struct ib_device *device,
 432                                              __be64 service_id,
 433                                              u8 *private_data)
 434 {
 435         struct rb_node *node = cm.listen_service_table.rb_node;
 436         struct cm_id_private *cm_id_priv;
 437         int data_cmp;
 438
 439         while (node) {
 440                 cm_id_priv = rb_entry(node, struct cm_id_private, service_node);
 441                 data_cmp = cm_compare_private_data(private_data,
 442                                                    cm_id_priv->compare_data);
 443                 if ((cm_id_priv->id.service_mask & service_id) ==
 444                      cm_id_priv->id.service_id &&
 445                     (cm_id_priv->id.device == device) && !data_cmp)
 446                         return cm_id_priv;
 447
 448                 if (device < cm_id_priv->id.device)
 449                         node = node->rb_left;
 450                 else if (device > cm_id_priv->id.device)
 451                         node = node->rb_right;
 452                 else if (service_id < cm_id_priv->id.service_id)
 453                         node = node->rb_left;
 454                 else if (service_id > cm_id_priv->id.service_id)
 455                         node = node->rb_right;
 456                 else if (data_cmp < 0)
 457                         node = node->rb_left;
 458                 else
 459                         node = node->rb_right;
 460         }
 461         return NULL;
 462 }
 463
 464 static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info
 465                                                      *timewait_info)
 466 {
 467         struct rb_node **link = &cm.remote_id_table.rb_node;
 468         struct rb_node *parent = NULL;
 469         struct cm_timewait_info *cur_timewait_info;
 470         __be64 remote_ca_guid = timewait_info->remote_ca_guid;
 471         __be32 remote_id = timewait_info->work.remote_id;
 472
 473         while (*link) {
 474                 parent = *link;
 475                 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
 476                                              remote_id_node);
 477                 if (remote_id < cur_timewait_info->work.remote_id)
 478                         link = &(*link)->rb_left;
 479                 else if (remote_id > cur_timewait_info->work.remote_id)
 480                         link = &(*link)->rb_right;
 481                 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid)
 482                         link = &(*link)->rb_left;
 483                 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid)
 484                         link = &(*link)->rb_right;
 485                 else
 486                         return cur_timewait_info;
 487         }
 488         timewait_info->inserted_remote_id = 1;
 489         rb_link_node(&timewait_info->remote_id_node, parent, link);
 490         rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table);
 491         return NULL;
 492 }
 493
 494 static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid,
 495                                                    __be32 remote_id)
 496 {
 497         struct rb_node *node = cm.remote_id_table.rb_node;
 498         struct cm_timewait_info *timewait_info;
 499
 500         while (node) {
 501                 timewait_info = rb_entry(node, struct cm_timewait_info,
 502                                          remote_id_node);
 503                 if (remote_id < timewait_info->work.remote_id)
 504                         node = node->rb_left;
 505                 else if (remote_id > timewait_info->work.remote_id)
 506                         node = node->rb_right;
 507                 else if (remote_ca_guid < timewait_info->remote_ca_guid)
 508                         node = node->rb_left;
 509                 else if (remote_ca_guid > timewait_info->remote_ca_guid)
 510                         node = node->rb_right;
 511                 else
 512                         return timewait_info;
 513         }
 514         return NULL;
 515 }
 516
 517 static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info
 518                                                       *timewait_info)
 519 {
 520         struct rb_node **link = &cm.remote_qp_table.rb_node;
 521         struct rb_node *parent = NULL;
 522         struct cm_timewait_info *cur_timewait_info;
 523         __be64 remote_ca_guid = timewait_info->remote_ca_guid;
 524         __be32 remote_qpn = timewait_info->remote_qpn;
 525
 526         while (*link) {
 527                 parent = *link;
 528                 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
 529                                              remote_qp_node);
 530                 if (remote_qpn < cur_timewait_info->remote_qpn)
 531                         link = &(*link)->rb_left;
 532                 else if (remote_qpn > cur_timewait_info->remote_qpn)
 533                         link = &(*link)->rb_right;
 534                 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid)
 535                         link = &(*link)->rb_left;
 536                 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid)
 537                         link = &(*link)->rb_right;
 538                 else
 539                         return cur_timewait_info;
 540         }
 541         timewait_info->inserted_remote_qp = 1;
 542         rb_link_node(&timewait_info->remote_qp_node, parent, link);
 543         rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table);
 544         return NULL;
 545 }
 546
 547 static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private
 548                                                     *cm_id_priv)
 549 {
 550         struct rb_node **link = &cm.remote_sidr_table.rb_node;
 551         struct rb_node *parent = NULL;
 552         struct cm_id_private *cur_cm_id_priv;
 553         union ib_gid *port_gid = &cm_id_priv->av.dgid;
 554         __be32 remote_id = cm_id_priv->id.remote_id;
 555
 556         while (*link) {
 557                 parent = *link;
 558                 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
 559                                           sidr_id_node);
 560                 if (remote_id < cur_cm_id_priv->id.remote_id)
 561                         link = &(*link)->rb_left;
 562                 else if (remote_id > cur_cm_id_priv->id.remote_id)
 563                         link = &(*link)->rb_right;
 564                 else {
 565                         int cmp;
 566                         cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid,
 567                                      sizeof *port_gid);
 568                         if (cmp < 0)
 569                                 link = &(*link)->rb_left;
 570                         else if (cmp > 0)
 571                                 link = &(*link)->rb_right;
 572                         else
 573                                 return cur_cm_id_priv;
 574                 }
 575         }
 576         rb_link_node(&cm_id_priv->sidr_id_node, parent, link);
 577         rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
 578         return NULL;
 579 }
 580
 581 static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv,
 582                                enum ib_cm_sidr_status status)
 583 {
 584         struct ib_cm_sidr_rep_param param;
 585
 586         memset(&param, 0, sizeof param);
 587         param.status = status;
 588         ib_send_cm_sidr_rep(&cm_id_priv->id, &param);
 589 }
 590
 591 struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
 592                                  ib_cm_handler cm_handler,
 593                                  void *context)
 594 {
 595         struct cm_id_private *cm_id_priv;
 596         int ret;
 597
 598         cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL);
 599         if (!cm_id_priv)
 600                 return ERR_PTR(-ENOMEM);
 601
 602         cm_id_priv->id.state = IB_CM_IDLE;
 603         cm_id_priv->id.device = device;
 604         cm_id_priv->id.cm_handler = cm_handler;
 605         cm_id_priv->id.context = context;
 606         cm_id_priv->id.remote_cm_qpn = 1;
 607         ret = cm_alloc_id(cm_id_priv);
 608         if (ret)
 609                 goto error;
 610
 611         spin_lock_init(&cm_id_priv->lock);
 612         init_completion(&cm_id_priv->comp);
 613         INIT_LIST_HEAD(&cm_id_priv->work_list);
 614         atomic_set(&cm_id_priv->work_count, -1);
 615         atomic_set(&cm_id_priv->refcount, 1);
 616         return &cm_id_priv->id;
 617
 618 error:
 619         kfree(cm_id_priv);
 620         return ERR_PTR(-ENOMEM);
 621 }
 622 EXPORT_SYMBOL(ib_create_cm_id);
 623
 624 static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv)
 625 {
 626         struct cm_work *work;
 627
 628         if (list_empty(&cm_id_priv->work_list))
 629                 return NULL;
 630
 631         work = list_entry(cm_id_priv->work_list.next, struct cm_work, list);
 632         list_del(&work->list);
 633         return work;
 634 }
 635
 636 static void cm_free_work(struct cm_work *work)
 637 {
 638         if (work->mad_recv_wc)
 639                 ib_free_recv_mad(work->mad_recv_wc);
 640         kfree(work);
 641 }
 642
 643 static inline int cm_convert_to_ms(int iba_time)
 644 {
 645         /* approximate conversion to ms from 4.096us x 2^iba_time */
 646         return 1 << max(iba_time - 8, 0);
 647 }
 648
 649 static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info)
 650 {
 651         if (timewait_info->inserted_remote_id) {
 652                 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table);
 653                 timewait_info->inserted_remote_id = 0;
 654         }
 655
 656         if (timewait_info->inserted_remote_qp) {
 657                 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table);
 658                 timewait_info->inserted_remote_qp = 0;
 659         }
 660 }
 661
 662 static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id)
 663 {
 664         struct cm_timewait_info *timewait_info;
 665
 666         timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL);
 667         if (!timewait_info)
 668                 return ERR_PTR(-ENOMEM);
 669
 670         timewait_info->work.local_id = local_id;
 671         INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler);
 672         timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT;
 673         return timewait_info;
 674 }
 675
 676 static void cm_enter_timewait(struct cm_id_private *cm_id_priv)
 677 {
 678         int wait_time;
 679         unsigned long flags;
 680
 681         spin_lock_irqsave(&cm.lock, flags);
 682         cm_cleanup_timewait(cm_id_priv->timewait_info);
 683         list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list);
 684         spin_unlock_irqrestore(&cm.lock, flags);
 685
 686         /*
 687          * The cm_id could be destroyed by the user before we exit timewait.
 688          * To protect against this, we search for the cm_id after exiting
 689          * timewait before notifying the user that we've exited timewait.
 690          */
 691         cm_id_priv->id.state = IB_CM_TIMEWAIT;
 692         wait_time = cm_convert_to_ms(cm_id_priv->av.packet_life_time + 1);
 693         queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work,
 694                            msecs_to_jiffies(wait_time));
 695         cm_id_priv->timewait_info = NULL;
 696 }
 697
 698 static void cm_reset_to_idle(struct cm_id_private *cm_id_priv)
 699 {
 700         unsigned long flags;
 701
 702         cm_id_priv->id.state = IB_CM_IDLE;
 703         if (cm_id_priv->timewait_info) {
 704                 spin_lock_irqsave(&cm.lock, flags);
 705                 cm_cleanup_timewait(cm_id_priv->timewait_info);
 706                 spin_unlock_irqrestore(&cm.lock, flags);
 707                 kfree(cm_id_priv->timewait_info);
 708                 cm_id_priv->timewait_info = NULL;
 709         }
 710 }
 711
 712 static void cm_destroy_id(struct ib_cm_id *cm_id, int err)
 713 {
 714         struct cm_id_private *cm_id_priv;
 715         struct cm_work *work;
 716         unsigned long flags;
 717
 718         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
 719 retest:
 720         spin_lock_irqsave(&cm_id_priv->lock, flags);
 721         switch (cm_id->state) {
 722         case IB_CM_LISTEN:
 723                 cm_id->state = IB_CM_IDLE;
 724                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 725                 spin_lock_irqsave(&cm.lock, flags);
 726                 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table);
 727                 spin_unlock_irqrestore(&cm.lock, flags);
 728                 break;
 729         case IB_CM_SIDR_REQ_SENT:
 730                 cm_id->state = IB_CM_IDLE;
 731                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
 732                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 733                 break;
 734         case IB_CM_SIDR_REQ_RCVD:
 735                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 736                 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT);
 737                 break;
 738         case IB_CM_REQ_SENT:
 739                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
 740                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 741                 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT,
 742                                &cm_id_priv->av.port->cm_dev->ca_guid,
 743                                sizeof cm_id_priv->av.port->cm_dev->ca_guid,
 744                                NULL, 0);
 745                 break;
 746         case IB_CM_REQ_RCVD:
 747                 if (err == -ENOMEM) {
 748                         /* Do not reject to allow future retries. */
 749                         cm_reset_to_idle(cm_id_priv);
 750                         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 751                 } else {
 752                         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 753                         ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
 754                                        NULL, 0, NULL, 0);
 755                 }
 756                 break;
 757         case IB_CM_MRA_REQ_RCVD:
 758         case IB_CM_REP_SENT:
 759         case IB_CM_MRA_REP_RCVD:
 760                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
 761                 /* Fall through */
 762         case IB_CM_MRA_REQ_SENT:
 763         case IB_CM_REP_RCVD:
 764         case IB_CM_MRA_REP_SENT:
 765                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 766                 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
 767                                NULL, 0, NULL, 0);
 768                 break;
 769         case IB_CM_ESTABLISHED:
 770                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 771                 ib_send_cm_dreq(cm_id, NULL, 0);
 772                 goto retest;
 773         case IB_CM_DREQ_SENT:
 774                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
 775                 cm_enter_timewait(cm_id_priv);
 776                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 777                 break;
 778         case IB_CM_DREQ_RCVD:
 779                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 780                 ib_send_cm_drep(cm_id, NULL, 0);
 781                 break;
 782         default:
 783                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 784                 break;
 785         }
 786
 787         cm_free_id(cm_id->local_id);
 788         cm_deref_id(cm_id_priv);
 789         wait_for_completion(&cm_id_priv->comp);
 790         while ((work = cm_dequeue_work(cm_id_priv)) != NULL)
 791                 cm_free_work(work);
 792         kfree(cm_id_priv->compare_data);
 793         kfree(cm_id_priv->private_data);
 794         kfree(cm_id_priv);
 795 }
 796
 797 void ib_destroy_cm_id(struct ib_cm_id *cm_id)
 798 {
 799         cm_destroy_id(cm_id, 0);
 800 }
 801 EXPORT_SYMBOL(ib_destroy_cm_id);
 802
 803 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask,
 804                  struct ib_cm_compare_data *compare_data)
 805 {
 806         struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
 807         unsigned long flags;
 808         int ret = 0;
 809
 810         service_mask = service_mask ? service_mask :
 811                        __constant_cpu_to_be64(~0ULL);
 812         service_id &= service_mask;
 813         if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID &&
 814             (service_id != IB_CM_ASSIGN_SERVICE_ID))
 815                 return -EINVAL;
 816
 817         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
 818         if (cm_id->state != IB_CM_IDLE)
 819                 return -EINVAL;
 820
 821         if (compare_data) {
 822                 cm_id_priv->compare_data = kzalloc(sizeof *compare_data,
 823                                                    GFP_KERNEL);
 824                 if (!cm_id_priv->compare_data)
 825                         return -ENOMEM;
 826                 cm_mask_copy(cm_id_priv->compare_data->data,
 827                              compare_data->data, compare_data->mask);
 828                 memcpy(cm_id_priv->compare_data->mask, compare_data->mask,
 829                        IB_CM_COMPARE_SIZE);
 830         }
 831
 832         cm_id->state = IB_CM_LISTEN;
 833
 834         spin_lock_irqsave(&cm.lock, flags);
 835         if (service_id == IB_CM_ASSIGN_SERVICE_ID) {
 836                 cm_id->service_id = cpu_to_be64(cm.listen_service_id++);
 837                 cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
 838         } else {
 839                 cm_id->service_id = service_id;
 840                 cm_id->service_mask = service_mask;
 841         }
 842         cur_cm_id_priv = cm_insert_listen(cm_id_priv);
 843         spin_unlock_irqrestore(&cm.lock, flags);
 844
 845         if (cur_cm_id_priv) {
 846                 cm_id->state = IB_CM_IDLE;
 847                 kfree(cm_id_priv->compare_data);
 848                 cm_id_priv->compare_data = NULL;
 849                 ret = -EBUSY;
 850         }
 851         return ret;
 852 }
 853 EXPORT_SYMBOL(ib_cm_listen);
 854
 855 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv,
 856                           enum cm_msg_sequence msg_seq)
 857 {
 858         u64 hi_tid, low_tid;
 859
 860         hi_tid   = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32;
 861         low_tid  = (u64) ((__force u32)cm_id_priv->id.local_id |
 862                           (msg_seq << 30));
 863         return cpu_to_be64(hi_tid | low_tid);
 864 }
 865
 866 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr,
 867                               __be16 attr_id, __be64 tid)
 868 {
 869         hdr->base_version  = IB_MGMT_BASE_VERSION;
 870         hdr->mgmt_class    = IB_MGMT_CLASS_CM;
 871         hdr->class_version = IB_CM_CLASS_VERSION;
 872         hdr->method        = IB_MGMT_METHOD_SEND;
 873         hdr->attr_id       = attr_id;
 874         hdr->tid           = tid;
 875 }
 876
 877 static void cm_format_req(struct cm_req_msg *req_msg,
 878                           struct cm_id_private *cm_id_priv,
 879                           struct ib_cm_req_param *param)
 880 {
 881         cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID,
 882                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ));
 883
 884         req_msg->local_comm_id = cm_id_priv->id.local_id;
 885         req_msg->service_id = param->service_id;
 886         req_msg->local_ca_guid = cm_id_priv->av.port->cm_dev->ca_guid;
 887         cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num));
 888         cm_req_set_resp_res(req_msg, param->responder_resources);
 889         cm_req_set_init_depth(req_msg, param->initiator_depth);
 890         cm_req_set_remote_resp_timeout(req_msg,
 891                                        param->remote_cm_response_timeout);
 892         cm_req_set_qp_type(req_msg, param->qp_type);
 893         cm_req_set_flow_ctrl(req_msg, param->flow_control);
 894         cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn));
 895         cm_req_set_local_resp_timeout(req_msg,
 896                                       param->local_cm_response_timeout);
 897         cm_req_set_retry_count(req_msg, param->retry_count);
 898         req_msg->pkey = param->primary_path->pkey;
 899         cm_req_set_path_mtu(req_msg, param->primary_path->mtu);
 900         cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count);
 901         cm_req_set_max_cm_retries(req_msg, param->max_cm_retries);
 902         cm_req_set_srq(req_msg, param->srq);
 903
 904         req_msg->primary_local_lid = param->primary_path->slid;
 905         req_msg->primary_remote_lid = param->primary_path->dlid;
 906         req_msg->primary_local_gid = param->primary_path->sgid;
 907         req_msg->primary_remote_gid = param->primary_path->dgid;
 908         cm_req_set_primary_flow_label(req_msg, param->primary_path->flow_label);
 909         cm_req_set_primary_packet_rate(req_msg, param->primary_path->rate);
 910         req_msg->primary_traffic_class = param->primary_path->traffic_class;
 911         req_msg->primary_hop_limit = param->primary_path->hop_limit;
 912         cm_req_set_primary_sl(req_msg, param->primary_path->sl);
 913         cm_req_set_primary_subnet_local(req_msg, 1); /* local only... */
 914         cm_req_set_primary_local_ack_timeout(req_msg,
 915                 min(31, param->primary_path->packet_life_time + 1));
 916
 917         if (param->alternate_path) {
 918                 req_msg->alt_local_lid = param->alternate_path->slid;
 919                 req_msg->alt_remote_lid = param->alternate_path->dlid;
 920                 req_msg->alt_local_gid = param->alternate_path->sgid;
 921                 req_msg->alt_remote_gid = param->alternate_path->dgid;
 922                 cm_req_set_alt_flow_label(req_msg,
 923                                           param->alternate_path->flow_label);
 924                 cm_req_set_alt_packet_rate(req_msg, param->alternate_path->rate);
 925                 req_msg->alt_traffic_class = param->alternate_path->traffic_class;
 926                 req_msg->alt_hop_limit = param->alternate_path->hop_limit;
 927                 cm_req_set_alt_sl(req_msg, param->alternate_path->sl);
 928                 cm_req_set_alt_subnet_local(req_msg, 1); /* local only... */
 929                 cm_req_set_alt_local_ack_timeout(req_msg,
 930                         min(31, param->alternate_path->packet_life_time + 1));
 931         }
 932
 933         if (param->private_data && param->private_data_len)
 934                 memcpy(req_msg->private_data, param->private_data,
 935                        param->private_data_len);
 936 }
 937
 938 static int cm_validate_req_param(struct ib_cm_req_param *param)
 939 {
 940         /* peer-to-peer not supported */
 941         if (param->peer_to_peer)
 942                 return -EINVAL;
 943
 944         if (!param->primary_path)
 945                 return -EINVAL;
 946
 947         if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC)
 948                 return -EINVAL;
 949
 950         if (param->private_data &&
 951             param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE)
 952                 return -EINVAL;
 953
 954         if (param->alternate_path &&
 955             (param->alternate_path->pkey != param->primary_path->pkey ||
 956              param->alternate_path->mtu != param->primary_path->mtu))
 957                 return -EINVAL;
 958
 959         return 0;
 960 }
 961
 962 int ib_send_cm_req(struct ib_cm_id *cm_id,
 963                    struct ib_cm_req_param *param)
 964 {
 965         struct cm_id_private *cm_id_priv;
 966         struct cm_req_msg *req_msg;
 967         unsigned long flags;
 968         int ret;
 969
 970         ret = cm_validate_req_param(param);
 971         if (ret)
 972                 return ret;
 973
 974         /* Verify that we're not in timewait. */
 975         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
 976         spin_lock_irqsave(&cm_id_priv->lock, flags);
 977         if (cm_id->state != IB_CM_IDLE) {
 978                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 979                 ret = -EINVAL;
 980                 goto out;
 981         }
 982         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 983
 984         cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
 985                                                             id.local_id);
 986         if (IS_ERR(cm_id_priv->timewait_info)) {
 987                 ret = PTR_ERR(cm_id_priv->timewait_info);
 988                 goto out;
 989         }
 990
 991         ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av);
 992         if (ret)
 993                 goto error1;
 994         if (param->alternate_path) {
 995                 ret = cm_init_av_by_path(param->alternate_path,
 996                                          &cm_id_priv->alt_av);
 997                 if (ret)
 998                         goto error1;
 999         }
1000         cm_id->service_id = param->service_id;
1001         cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
1002         cm_id_priv->timeout_ms = cm_convert_to_ms(
1003                                     param->primary_path->packet_life_time) * 2 +
1004                                  cm_convert_to_ms(
1005                                     param->remote_cm_response_timeout);
1006         cm_id_priv->max_cm_retries = param->max_cm_retries;
1007         cm_id_priv->initiator_depth = param->initiator_depth;
1008         cm_id_priv->responder_resources = param->responder_resources;
1009         cm_id_priv->retry_count = param->retry_count;
1010         cm_id_priv->path_mtu = param->primary_path->mtu;
1011         cm_id_priv->pkey = param->primary_path->pkey;
1012         cm_id_priv->qp_type = param->qp_type;
1013
1014         ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg);
1015         if (ret)
1016                 goto error1;
1017
1018         req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad;
1019         cm_format_req(req_msg, cm_id_priv, param);
1020         cm_id_priv->tid = req_msg->hdr.tid;
1021         cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms;
1022         cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT;
1023
1024         cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg);
1025         cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg);
1026
1027         spin_lock_irqsave(&cm_id_priv->lock, flags);
1028         ret = ib_post_send_mad(cm_id_priv->msg, NULL);
1029         if (ret) {
1030                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1031                 goto error2;
1032         }
1033         BUG_ON(cm_id->state != IB_CM_IDLE);
1034         cm_id->state = IB_CM_REQ_SENT;
1035         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1036         return 0;
1037
1038 error2: cm_free_msg(cm_id_priv->msg);
1039 error1: kfree(cm_id_priv->timewait_info);
1040 out:    return ret;
1041 }
1042 EXPORT_SYMBOL(ib_send_cm_req);
1043
1044 static int cm_issue_rej(struct cm_port *port,
1045                         struct ib_mad_recv_wc *mad_recv_wc,
1046                         enum ib_cm_rej_reason reason,
1047                         enum cm_msg_response msg_rejected,
1048                         void *ari, u8 ari_length)
1049 {
1050         struct ib_mad_send_buf *msg = NULL;
1051         struct cm_rej_msg *rej_msg, *rcv_msg;
1052         int ret;
1053
1054         ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
1055         if (ret)
1056                 return ret;
1057
1058         /* We just need common CM header information.  Cast to any message. */
1059         rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad;
1060         rej_msg = (struct cm_rej_msg *) msg->mad;
1061
1062         cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid);
1063         rej_msg->remote_comm_id = rcv_msg->local_comm_id;
1064         rej_msg->local_comm_id = rcv_msg->remote_comm_id;
1065         cm_rej_set_msg_rejected(rej_msg, msg_rejected);
1066         rej_msg->reason = cpu_to_be16(reason);
1067
1068         if (ari && ari_length) {
1069                 cm_rej_set_reject_info_len(rej_msg, ari_length);
1070                 memcpy(rej_msg->ari, ari, ari_length);
1071         }
1072
1073         ret = ib_post_send_mad(msg, NULL);
1074         if (ret)
1075                 cm_free_msg(msg);
1076
1077         return ret;
1078 }
1079
1080 static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid,
1081                                     __be32 local_qpn, __be32 remote_qpn)
1082 {
1083         return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) ||
1084                 ((local_ca_guid == remote_ca_guid) &&
1085                  (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn))));
1086 }
1087
1088 static void cm_format_paths_from_req(struct cm_req_msg *req_msg,
1089                                             struct ib_sa_path_rec *primary_path,
1090                                             struct ib_sa_path_rec *alt_path)
1091 {
1092         memset(primary_path, 0, sizeof *primary_path);
1093         primary_path->dgid = req_msg->primary_local_gid;
1094         primary_path->sgid = req_msg->primary_remote_gid;
1095         primary_path->dlid = req_msg->primary_local_lid;
1096         primary_path->slid = req_msg->primary_remote_lid;
1097         primary_path->flow_label = cm_req_get_primary_flow_label(req_msg);
1098         primary_path->hop_limit = req_msg->primary_hop_limit;
1099         primary_path->traffic_class = req_msg->primary_traffic_class;
1100         primary_path->reversible = 1;
1101         primary_path->pkey = req_msg->pkey;
1102         primary_path->sl = cm_req_get_primary_sl(req_msg);
1103         primary_path->mtu_selector = IB_SA_EQ;
1104         primary_path->mtu = cm_req_get_path_mtu(req_msg);
1105         primary_path->rate_selector = IB_SA_EQ;
1106         primary_path->rate = cm_req_get_primary_packet_rate(req_msg);
1107         primary_path->packet_life_time_selector = IB_SA_EQ;
1108         primary_path->packet_life_time =
1109                 cm_req_get_primary_local_ack_timeout(req_msg);
1110         primary_path->packet_life_time -= (primary_path->packet_life_time > 0);
1111
1112         if (req_msg->alt_local_lid) {
1113                 memset(alt_path, 0, sizeof *alt_path);
1114                 alt_path->dgid = req_msg->alt_local_gid;
1115                 alt_path->sgid = req_msg->alt_remote_gid;
1116                 alt_path->dlid = req_msg->alt_local_lid;
1117                 alt_path->slid = req_msg->alt_remote_lid;
1118                 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg);
1119                 alt_path->hop_limit = req_msg->alt_hop_limit;
1120                 alt_path->traffic_class = req_msg->alt_traffic_class;
1121                 alt_path->reversible = 1;
1122                 alt_path->pkey = req_msg->pkey;
1123                 alt_path->sl = cm_req_get_alt_sl(req_msg);
1124                 alt_path->mtu_selector = IB_SA_EQ;
1125                 alt_path->mtu = cm_req_get_path_mtu(req_msg);
1126                 alt_path->rate_selector = IB_SA_EQ;
1127                 alt_path->rate = cm_req_get_alt_packet_rate(req_msg);
1128                 alt_path->packet_life_time_selector = IB_SA_EQ;
1129                 alt_path->packet_life_time =
1130                         cm_req_get_alt_local_ack_timeout(req_msg);
1131                 alt_path->packet_life_time -= (alt_path->packet_life_time > 0);
1132         }
1133 }
1134
1135 static void cm_format_req_event(struct cm_work *work,
1136                                 struct cm_id_private *cm_id_priv,
1137                                 struct ib_cm_id *listen_id)
1138 {
1139         struct cm_req_msg *req_msg;
1140         struct ib_cm_req_event_param *param;
1141
1142         req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1143         param = &work->cm_event.param.req_rcvd;
1144         param->listen_id = listen_id;
1145         param->port = cm_id_priv->av.port->port_num;
1146         param->primary_path = &work->path[0];
1147         if (req_msg->alt_local_lid)
1148                 param->alternate_path = &work->path[1];
1149         else
1150                 param->alternate_path = NULL;
1151         param->remote_ca_guid = req_msg->local_ca_guid;
1152         param->remote_qkey = be32_to_cpu(req_msg->local_qkey);
1153         param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg));
1154         param->qp_type = cm_req_get_qp_type(req_msg);
1155         param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg));
1156         param->responder_resources = cm_req_get_init_depth(req_msg);
1157         param->initiator_depth = cm_req_get_resp_res(req_msg);
1158         param->local_cm_response_timeout =
1159                                         cm_req_get_remote_resp_timeout(req_msg);
1160         param->flow_control = cm_req_get_flow_ctrl(req_msg);
1161         param->remote_cm_response_timeout =
1162                                         cm_req_get_local_resp_timeout(req_msg);
1163         param->retry_count = cm_req_get_retry_count(req_msg);
1164         param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1165         param->srq = cm_req_get_srq(req_msg);
1166         work->cm_event.private_data = &req_msg->private_data;
1167 }
1168
1169 static void cm_process_work(struct cm_id_private *cm_id_priv,
1170                             struct cm_work *work)
1171 {
1172         unsigned long flags;
1173         int ret;
1174
1175         /* We will typically only have the current event to report. */
1176         ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
1177         cm_free_work(work);
1178
1179         while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) {
1180                 spin_lock_irqsave(&cm_id_priv->lock, flags);
1181                 work = cm_dequeue_work(cm_id_priv);
1182                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1183                 BUG_ON(!work);
1184                 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id,
1185                                                 &work->cm_event);
1186                 cm_free_work(work);
1187         }
1188         cm_deref_id(cm_id_priv);
1189         if (ret)
1190                 cm_destroy_id(&cm_id_priv->id, ret);
1191 }
1192
1193 static void cm_format_mra(struct cm_mra_msg *mra_msg,
1194                           struct cm_id_private *cm_id_priv,
1195                           enum cm_msg_response msg_mraed, u8 service_timeout,
1196                           const void *private_data, u8 private_data_len)
1197 {
1198         cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid);
1199         cm_mra_set_msg_mraed(mra_msg, msg_mraed);
1200         mra_msg->local_comm_id = cm_id_priv->id.local_id;
1201         mra_msg->remote_comm_id = cm_id_priv->id.remote_id;
1202         cm_mra_set_service_timeout(mra_msg, service_timeout);
1203
1204         if (private_data && private_data_len)
1205                 memcpy(mra_msg->private_data, private_data, private_data_len);
1206 }
1207
1208 static void cm_format_rej(struct cm_rej_msg *rej_msg,
1209                           struct cm_id_private *cm_id_priv,
1210                           enum ib_cm_rej_reason reason,
1211                           void *ari,
1212                           u8 ari_length,
1213                           const void *private_data,
1214                           u8 private_data_len)
1215 {
1216         cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid);
1217         rej_msg->remote_comm_id = cm_id_priv->id.remote_id;
1218
1219         switch(cm_id_priv->id.state) {
1220         case IB_CM_REQ_RCVD:
1221                 rej_msg->local_comm_id = 0;
1222                 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1223                 break;
1224         case IB_CM_MRA_REQ_SENT:
1225                 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1226                 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1227                 break;
1228         case IB_CM_REP_RCVD:
1229         case IB_CM_MRA_REP_SENT:
1230                 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1231                 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP);
1232                 break;
1233         default:
1234                 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1235                 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER);
1236                 break;
1237         }
1238
1239         rej_msg->reason = cpu_to_be16(reason);
1240         if (ari && ari_length) {
1241                 cm_rej_set_reject_info_len(rej_msg, ari_length);
1242                 memcpy(rej_msg->ari, ari, ari_length);
1243         }
1244
1245         if (private_data && private_data_len)
1246                 memcpy(rej_msg->private_data, private_data, private_data_len);
1247 }
1248
1249 static void cm_dup_req_handler(struct cm_work *work,
1250                                struct cm_id_private *cm_id_priv)
1251 {
1252         struct ib_mad_send_buf *msg = NULL;
1253         unsigned long flags;
1254         int ret;
1255
1256         /* Quick state check to discard duplicate REQs. */
1257         if (cm_id_priv->id.state == IB_CM_REQ_RCVD)
1258                 return;
1259
1260         ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1261         if (ret)
1262                 return;
1263
1264         spin_lock_irqsave(&cm_id_priv->lock, flags);
1265         switch (cm_id_priv->id.state) {
1266         case IB_CM_MRA_REQ_SENT:
1267                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1268                               CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout,
1269                               cm_id_priv->private_data,
1270                               cm_id_priv->private_data_len);
1271                 break;
1272         case IB_CM_TIMEWAIT:
1273                 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv,
1274                               IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0);
1275                 break;
1276         default:
1277                 goto unlock;
1278         }
1279         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1280
1281         ret = ib_post_send_mad(msg, NULL);
1282         if (ret)
1283                 goto free;
1284         return;
1285
1286 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1287 free:   cm_free_msg(msg);
1288 }
1289
1290 static struct cm_id_private * cm_match_req(struct cm_work *work,
1291                                            struct cm_id_private *cm_id_priv)
1292 {
1293         struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv;
1294         struct cm_timewait_info *timewait_info;
1295         struct cm_req_msg *req_msg;
1296         unsigned long flags;
1297
1298         req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1299
1300         /* Check for duplicate REQ and stale connections. */
1301         spin_lock_irqsave(&cm.lock, flags);
1302         timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info);
1303         if (!timewait_info)
1304                 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
1305
1306         if (timewait_info) {
1307                 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
1308                                            timewait_info->work.remote_id);
1309                 cm_cleanup_timewait(cm_id_priv->timewait_info);
1310                 spin_unlock_irqrestore(&cm.lock, flags);
1311                 if (cur_cm_id_priv) {
1312                         cm_dup_req_handler(work, cur_cm_id_priv);
1313                         cm_deref_id(cur_cm_id_priv);
1314                 } else
1315                         cm_issue_rej(work->port, work->mad_recv_wc,
1316                                      IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
1317                                      NULL, 0);
1318                 listen_cm_id_priv = NULL;
1319                 goto out;
1320         }
1321
1322         /* Find matching listen request. */
1323         listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device,
1324                                            req_msg->service_id,
1325                                            req_msg->private_data);
1326         if (!listen_cm_id_priv) {
1327                 cm_cleanup_timewait(cm_id_priv->timewait_info);
1328                 spin_unlock_irqrestore(&cm.lock, flags);
1329                 cm_issue_rej(work->port, work->mad_recv_wc,
1330                              IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ,
1331                              NULL, 0);
1332                 goto out;
1333         }
1334         atomic_inc(&listen_cm_id_priv->refcount);
1335         atomic_inc(&cm_id_priv->refcount);
1336         cm_id_priv->id.state = IB_CM_REQ_RCVD;
1337         atomic_inc(&cm_id_priv->work_count);
1338         spin_unlock_irqrestore(&cm.lock, flags);
1339 out:
1340         return listen_cm_id_priv;
1341 }
1342
1343 static int cm_req_handler(struct cm_work *work)
1344 {
1345         struct ib_cm_id *cm_id;
1346         struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
1347         struct cm_req_msg *req_msg;
1348         int ret;
1349
1350         req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1351
1352         cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL);
1353         if (IS_ERR(cm_id))
1354                 return PTR_ERR(cm_id);
1355
1356         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1357         cm_id_priv->id.remote_id = req_msg->local_comm_id;
1358         cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
1359                                 work->mad_recv_wc->recv_buf.grh,
1360                                 &cm_id_priv->av);
1361         cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1362                                                             id.local_id);
1363         if (IS_ERR(cm_id_priv->timewait_info)) {
1364                 ret = PTR_ERR(cm_id_priv->timewait_info);
1365                 goto destroy;
1366         }
1367         cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id;
1368         cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid;
1369         cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg);
1370
1371         listen_cm_id_priv = cm_match_req(work, cm_id_priv);
1372         if (!listen_cm_id_priv) {
1373                 ret = -EINVAL;
1374                 kfree(cm_id_priv->timewait_info);
1375                 goto destroy;
1376         }
1377
1378         cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
1379         cm_id_priv->id.context = listen_cm_id_priv->id.context;
1380         cm_id_priv->id.service_id = req_msg->service_id;
1381         cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL);
1382
1383         cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]);
1384         ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av);
1385         if (ret) {
1386                 ib_get_cached_gid(work->port->cm_dev->device,
1387                                   work->port->port_num, 0, &work->path[0].sgid);
1388                 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID,
1389                                &work->path[0].sgid, sizeof work->path[0].sgid,
1390                                NULL, 0);
1391                 goto rejected;
1392         }
1393         if (req_msg->alt_local_lid) {
1394                 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av);
1395                 if (ret) {
1396                         ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID,
1397                                        &work->path[0].sgid,
1398                                        sizeof work->path[0].sgid, NULL, 0);
1399                         goto rejected;
1400                 }
1401         }
1402         cm_id_priv->tid = req_msg->hdr.tid;
1403         cm_id_priv->timeout_ms = cm_convert_to_ms(
1404                                         cm_req_get_local_resp_timeout(req_msg));
1405         cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg);
1406         cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg);
1407         cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg);
1408         cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg);
1409         cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg);
1410         cm_id_priv->pkey = req_msg->pkey;
1411         cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg);
1412         cm_id_priv->retry_count = cm_req_get_retry_count(req_msg);
1413         cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1414         cm_id_priv->qp_type = cm_req_get_qp_type(req_msg);
1415
1416         cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
1417         cm_process_work(cm_id_priv, work);
1418         cm_deref_id(listen_cm_id_priv);
1419         return 0;
1420
1421 rejected:
1422         atomic_dec(&cm_id_priv->refcount);
1423         cm_deref_id(listen_cm_id_priv);
1424 destroy:
1425         ib_destroy_cm_id(cm_id);
1426         return ret;
1427 }
1428
1429 static void cm_format_rep(struct cm_rep_msg *rep_msg,
1430                           struct cm_id_private *cm_id_priv,
1431                           struct ib_cm_rep_param *param)
1432 {
1433         cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid);
1434         rep_msg->local_comm_id = cm_id_priv->id.local_id;
1435         rep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1436         cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num));
1437         cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn));
1438         rep_msg->resp_resources = param->responder_resources;
1439         rep_msg->initiator_depth = param->initiator_depth;
1440         cm_rep_set_target_ack_delay(rep_msg, param->target_ack_delay);
1441         cm_rep_set_failover(rep_msg, param->failover_accepted);
1442         cm_rep_set_flow_ctrl(rep_msg, param->flow_control);
1443         cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count);
1444         cm_rep_set_srq(rep_msg, param->srq);
1445         rep_msg->local_ca_guid = cm_id_priv->av.port->cm_dev->ca_guid;
1446
1447         if (param->private_data && param->private_data_len)
1448                 memcpy(rep_msg->private_data, param->private_data,
1449                        param->private_data_len);
1450 }
1451
1452 int ib_send_cm_rep(struct ib_cm_id *cm_id,
1453                    struct ib_cm_rep_param *param)
1454 {
1455         struct cm_id_private *cm_id_priv;
1456         struct ib_mad_send_buf *msg;
1457         struct cm_rep_msg *rep_msg;
1458         unsigned long flags;
1459         int ret;
1460
1461         if (param->private_data &&
1462             param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE)
1463                 return -EINVAL;
1464
1465         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1466         spin_lock_irqsave(&cm_id_priv->lock, flags);
1467         if (cm_id->state != IB_CM_REQ_RCVD &&
1468             cm_id->state != IB_CM_MRA_REQ_SENT) {
1469                 ret = -EINVAL;
1470                 goto out;
1471         }
1472
1473         ret = cm_alloc_msg(cm_id_priv, &msg);
1474         if (ret)
1475                 goto out;
1476
1477         rep_msg = (struct cm_rep_msg *) msg->mad;
1478         cm_format_rep(rep_msg, cm_id_priv, param);
1479         msg->timeout_ms = cm_id_priv->timeout_ms;
1480         msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;
1481
1482         ret = ib_post_send_mad(msg, NULL);
1483         if (ret) {
1484                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1485                 cm_free_msg(msg);
1486                 return ret;
1487         }
1488
1489         cm_id->state = IB_CM_REP_SENT;
1490         cm_id_priv->msg = msg;
1491         cm_id_priv->initiator_depth = param->initiator_depth;
1492         cm_id_priv->responder_resources = param->responder_resources;
1493         cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg);
1494         cm_id_priv->local_qpn = cm_rep_get_local_qpn(rep_msg);
1495
1496 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1497         return ret;
1498 }
1499 EXPORT_SYMBOL(ib_send_cm_rep);
1500
1501 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg,
1502                           struct cm_id_private *cm_id_priv,
1503                           const void *private_data,
1504                           u8 private_data_len)
1505 {
1506         cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid);
1507         rtu_msg->local_comm_id = cm_id_priv->id.local_id;
1508         rtu_msg->remote_comm_id = cm_id_priv->id.remote_id;
1509
1510         if (private_data && private_data_len)
1511                 memcpy(rtu_msg->private_data, private_data, private_data_len);
1512 }
1513
1514 int ib_send_cm_rtu(struct ib_cm_id *cm_id,
1515                    const void *private_data,
1516                    u8 private_data_len)
1517 {
1518         struct cm_id_private *cm_id_priv;
1519         struct ib_mad_send_buf *msg;
1520         unsigned long flags;
1521         void *data;
1522         int ret;
1523
1524         if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE)
1525                 return -EINVAL;
1526
1527         data = cm_copy_private_data(private_data, private_data_len);
1528         if (IS_ERR(data))
1529                 return PTR_ERR(data);
1530
1531         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1532         spin_lock_irqsave(&cm_id_priv->lock, flags);
1533         if (cm_id->state != IB_CM_REP_RCVD &&
1534             cm_id->state != IB_CM_MRA_REP_SENT) {
1535                 ret = -EINVAL;
1536                 goto error;
1537         }
1538
1539         ret = cm_alloc_msg(cm_id_priv, &msg);
1540         if (ret)
1541                 goto error;
1542
1543         cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1544                       private_data, private_data_len);
1545
1546         ret = ib_post_send_mad(msg, NULL);
1547         if (ret) {
1548                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1549                 cm_free_msg(msg);
1550                 kfree(data);
1551                 return ret;
1552         }
1553
1554         cm_id->state = IB_CM_ESTABLISHED;
1555         cm_set_private_data(cm_id_priv, data, private_data_len);
1556         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1557         return 0;
1558
1559 error:  spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1560         kfree(data);
1561         return ret;
1562 }
1563 EXPORT_SYMBOL(ib_send_cm_rtu);
1564
1565 static void cm_format_rep_event(struct cm_work *work)
1566 {
1567         struct cm_rep_msg *rep_msg;
1568         struct ib_cm_rep_event_param *param;
1569
1570         rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1571         param = &work->cm_event.param.rep_rcvd;
1572         param->remote_ca_guid = rep_msg->local_ca_guid;
1573         param->remote_qkey = be32_to_cpu(rep_msg->local_qkey);
1574         param->remote_qpn = be32_to_cpu(cm_rep_get_local_qpn(rep_msg));
1575         param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg));
1576         param->responder_resources = rep_msg->initiator_depth;
1577         param->initiator_depth = rep_msg->resp_resources;
1578         param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
1579         param->failover_accepted = cm_rep_get_failover(rep_msg);
1580         param->flow_control = cm_rep_get_flow_ctrl(rep_msg);
1581         param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1582         param->srq = cm_rep_get_srq(rep_msg);
1583         work->cm_event.private_data = &rep_msg->private_data;
1584 }
1585
1586 static void cm_dup_rep_handler(struct cm_work *work)
1587 {
1588         struct cm_id_private *cm_id_priv;
1589         struct cm_rep_msg *rep_msg;
1590         struct ib_mad_send_buf *msg = NULL;
1591         unsigned long flags;
1592         int ret;
1593
1594         rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad;
1595         cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id,
1596                                    rep_msg->local_comm_id);
1597         if (!cm_id_priv)
1598                 return;
1599
1600         ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1601         if (ret)
1602                 goto deref;
1603
1604         spin_lock_irqsave(&cm_id_priv->lock, flags);
1605         if (cm_id_priv->id.state == IB_CM_ESTABLISHED)
1606                 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1607                               cm_id_priv->private_data,
1608                               cm_id_priv->private_data_len);
1609         else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT)
1610                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1611                               CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout,
1612                               cm_id_priv->private_data,
1613                               cm_id_priv->private_data_len);
1614         else
1615                 goto unlock;
1616         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1617
1618         ret = ib_post_send_mad(msg, NULL);
1619         if (ret)
1620                 goto free;
1621         goto deref;
1622
1623 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1624 free:   cm_free_msg(msg);
1625 deref:  cm_deref_id(cm_id_priv);
1626 }
1627
1628 static int cm_rep_handler(struct cm_work *work)
1629 {
1630         struct cm_id_private *cm_id_priv;
1631         struct cm_rep_msg *rep_msg;
1632         unsigned long flags;
1633         int ret;
1634
1635         rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1636         cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0);
1637         if (!cm_id_priv) {
1638                 cm_dup_rep_handler(work);
1639                 return -EINVAL;
1640         }
1641
1642         cm_format_rep_event(work);
1643
1644         spin_lock_irqsave(&cm_id_priv->lock, flags);
1645         switch (cm_id_priv->id.state) {
1646         case IB_CM_REQ_SENT:
1647         case IB_CM_MRA_REQ_RCVD:
1648                 break;
1649         default:
1650                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1651                 ret = -EINVAL;
1652                 goto error;
1653         }
1654
1655         cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id;
1656         cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid;
1657         cm_id_priv->timewait_info->remote_qpn = cm_rep_get_local_qpn(rep_msg);
1658
1659         spin_lock(&cm.lock);
1660         /* Check for duplicate REP. */
1661         if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
1662                 spin_unlock(&cm.lock);
1663                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1664                 ret = -EINVAL;
1665                 goto error;
1666         }
1667         /* Check for a stale connection. */
1668         if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) {
1669                 rb_erase(&cm_id_priv->timewait_info->remote_id_node,
1670                          &cm.remote_id_table);
1671                 cm_id_priv->timewait_info->inserted_remote_id = 0;
1672                 spin_unlock(&cm.lock);
1673                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1674                 cm_issue_rej(work->port, work->mad_recv_wc,
1675                              IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP,
1676                              NULL, 0);
1677                 ret = -EINVAL;
1678                 goto error;
1679         }
1680         spin_unlock(&cm.lock);
1681
1682         cm_id_priv->id.state = IB_CM_REP_RCVD;
1683         cm_id_priv->id.remote_id = rep_msg->local_comm_id;
1684         cm_id_priv->remote_qpn = cm_rep_get_local_qpn(rep_msg);
1685         cm_id_priv->initiator_depth = rep_msg->resp_resources;
1686         cm_id_priv->responder_resources = rep_msg->initiator_depth;
1687         cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg);
1688         cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1689
1690         /* todo: handle peer_to_peer */
1691
1692         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1693         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1694         if (!ret)
1695                 list_add_tail(&work->list, &cm_id_priv->work_list);
1696         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1697
1698         if (ret)
1699                 cm_process_work(cm_id_priv, work);
1700         else
1701                 cm_deref_id(cm_id_priv);
1702         return 0;
1703
1704 error:
1705         cm_deref_id(cm_id_priv);
1706         return ret;
1707 }
1708
1709 static int cm_establish_handler(struct cm_work *work)
1710 {
1711         struct cm_id_private *cm_id_priv;
1712         unsigned long flags;
1713         int ret;
1714
1715         /* See comment in cm_establish about lookup. */
1716         cm_id_priv = cm_acquire_id(work->local_id, work->remote_id);
1717         if (!cm_id_priv)
1718                 return -EINVAL;
1719
1720         spin_lock_irqsave(&cm_id_priv->lock, flags);
1721         if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
1722                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1723                 goto out;
1724         }
1725
1726         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1727         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1728         if (!ret)
1729                 list_add_tail(&work->list, &cm_id_priv->work_list);
1730         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1731
1732         if (ret)
1733                 cm_process_work(cm_id_priv, work);
1734         else
1735                 cm_deref_id(cm_id_priv);
1736         return 0;
1737 out:
1738         cm_deref_id(cm_id_priv);
1739         return -EINVAL;
1740 }
1741
1742 static int cm_rtu_handler(struct cm_work *work)
1743 {
1744         struct cm_id_private *cm_id_priv;
1745         struct cm_rtu_msg *rtu_msg;
1746         unsigned long flags;
1747         int ret;
1748
1749         rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad;
1750         cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id,
1751                                    rtu_msg->local_comm_id);
1752         if (!cm_id_priv)
1753                 return -EINVAL;
1754
1755         work->cm_event.private_data = &rtu_msg->private_data;
1756
1757         spin_lock_irqsave(&cm_id_priv->lock, flags);
1758         if (cm_id_priv->id.state != IB_CM_REP_SENT &&
1759             cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
1760                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1761                 goto out;
1762         }
1763         cm_id_priv->id.state = IB_CM_ESTABLISHED;
1764
1765         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1766         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1767         if (!ret)
1768                 list_add_tail(&work->list, &cm_id_priv->work_list);
1769         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1770
1771         if (ret)
1772                 cm_process_work(cm_id_priv, work);
1773         else
1774                 cm_deref_id(cm_id_priv);
1775         return 0;
1776 out:
1777         cm_deref_id(cm_id_priv);
1778         return -EINVAL;
1779 }
1780
1781 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg,
1782                           struct cm_id_private *cm_id_priv,
1783                           const void *private_data,
1784                           u8 private_data_len)
1785 {
1786         cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID,
1787                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ));
1788         dreq_msg->local_comm_id = cm_id_priv->id.local_id;
1789         dreq_msg->remote_comm_id = cm_id_priv->id.remote_id;
1790         cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn);
1791
1792         if (private_data && private_data_len)
1793                 memcpy(dreq_msg->private_data, private_data, private_data_len);
1794 }
1795
1796 int ib_send_cm_dreq(struct ib_cm_id *cm_id,
1797                     const void *private_data,
1798                     u8 private_data_len)
1799 {
1800         struct cm_id_private *cm_id_priv;
1801         struct ib_mad_send_buf *msg;
1802         unsigned long flags;
1803         int ret;
1804
1805         if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE)
1806                 return -EINVAL;
1807
1808         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1809         spin_lock_irqsave(&cm_id_priv->lock, flags);
1810         if (cm_id->state != IB_CM_ESTABLISHED) {
1811                 ret = -EINVAL;
1812                 goto out;
1813         }
1814
1815         ret = cm_alloc_msg(cm_id_priv, &msg);
1816         if (ret) {
1817                 cm_enter_timewait(cm_id_priv);
1818                 goto out;
1819         }
1820
1821         cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv,
1822                        private_data, private_data_len);
1823         msg->timeout_ms = cm_id_priv->timeout_ms;
1824         msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
1825
1826         ret = ib_post_send_mad(msg, NULL);
1827         if (ret) {
1828                 cm_enter_timewait(cm_id_priv);
1829                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1830                 cm_free_msg(msg);
1831                 return ret;
1832         }
1833
1834         cm_id->state = IB_CM_DREQ_SENT;
1835         cm_id_priv->msg = msg;
1836 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1837         return ret;
1838 }
1839 EXPORT_SYMBOL(ib_send_cm_dreq);
1840
1841 static void cm_format_drep(struct cm_drep_msg *drep_msg,
1842                           struct cm_id_private *cm_id_priv,
1843                           const void *private_data,
1844                           u8 private_data_len)
1845 {
1846         cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid);
1847         drep_msg->local_comm_id = cm_id_priv->id.local_id;
1848         drep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1849
1850         if (private_data && private_data_len)
1851                 memcpy(drep_msg->private_data, private_data, private_data_len);
1852 }
1853
1854 int ib_send_cm_drep(struct ib_cm_id *cm_id,
1855                     const void *private_data,
1856                     u8 private_data_len)
1857 {
1858         struct cm_id_private *cm_id_priv;
1859         struct ib_mad_send_buf *msg;
1860         unsigned long flags;
1861         void *data;
1862         int ret;
1863
1864         if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
1865                 return -EINVAL;
1866
1867         data = cm_copy_private_data(private_data, private_data_len);
1868         if (IS_ERR(data))
1869                 return PTR_ERR(data);
1870
1871         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1872         spin_lock_irqsave(&cm_id_priv->lock, flags);
1873         if (cm_id->state != IB_CM_DREQ_RCVD) {
1874                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1875                 kfree(data);
1876                 return -EINVAL;
1877         }
1878
1879         cm_set_private_data(cm_id_priv, data, private_data_len);
1880         cm_enter_timewait(cm_id_priv);
1881
1882         ret = cm_alloc_msg(cm_id_priv, &msg);
1883         if (ret)
1884                 goto out;
1885
1886         cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
1887                        private_data, private_data_len);
1888
1889         ret = ib_post_send_mad(msg, NULL);
1890         if (ret) {
1891                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1892                 cm_free_msg(msg);
1893                 return ret;
1894         }
1895
1896 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1897         return ret;
1898 }
1899 EXPORT_SYMBOL(ib_send_cm_drep);
1900
1901 static int cm_issue_drep(struct cm_port *port,
1902                          struct ib_mad_recv_wc *mad_recv_wc)
1903 {
1904         struct ib_mad_send_buf *msg = NULL;
1905         struct cm_dreq_msg *dreq_msg;
1906         struct cm_drep_msg *drep_msg;
1907         int ret;
1908
1909         ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
1910         if (ret)
1911                 return ret;
1912
1913         dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad;
1914         drep_msg = (struct cm_drep_msg *) msg->mad;
1915
1916         cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid);
1917         drep_msg->remote_comm_id = dreq_msg->local_comm_id;
1918         drep_msg->local_comm_id = dreq_msg->remote_comm_id;
1919
1920         ret = ib_post_send_mad(msg, NULL);
1921         if (ret)
1922                 cm_free_msg(msg);
1923
1924         return ret;
1925 }
1926
1927 static int cm_dreq_handler(struct cm_work *work)
1928 {
1929         struct cm_id_private *cm_id_priv;
1930         struct cm_dreq_msg *dreq_msg;
1931         struct ib_mad_send_buf *msg = NULL;
1932         unsigned long flags;
1933         int ret;
1934
1935         dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
1936         cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id,
1937                                    dreq_msg->local_comm_id);
1938         if (!cm_id_priv) {
1939                 cm_issue_drep(work->port, work->mad_recv_wc);
1940                 return -EINVAL;
1941         }
1942
1943         work->cm_event.private_data = &dreq_msg->private_data;
1944
1945         spin_lock_irqsave(&cm_id_priv->lock, flags);
1946         if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg))
1947                 goto unlock;
1948
1949         switch (cm_id_priv->id.state) {
1950         case IB_CM_REP_SENT:
1951         case IB_CM_DREQ_SENT:
1952                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1953                 break;
1954         case IB_CM_ESTABLISHED:
1955         case IB_CM_MRA_REP_RCVD:
1956                 break;
1957         case IB_CM_TIMEWAIT:
1958                 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
1959                         goto unlock;
1960
1961                 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
1962                                cm_id_priv->private_data,
1963                                cm_id_priv->private_data_len);
1964                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1965
1966                 if (ib_post_send_mad(msg, NULL))
1967                         cm_free_msg(msg);
1968                 goto deref;
1969         default:
1970                 goto unlock;
1971         }
1972         cm_id_priv->id.state = IB_CM_DREQ_RCVD;
1973         cm_id_priv->tid = dreq_msg->hdr.tid;
1974         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1975         if (!ret)
1976                 list_add_tail(&work->list, &cm_id_priv->work_list);
1977         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1978
1979         if (ret)
1980                 cm_process_work(cm_id_priv, work);
1981         else
1982                 cm_deref_id(cm_id_priv);
1983         return 0;
1984
1985 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1986 deref:  cm_deref_id(cm_id_priv);
1987         return -EINVAL;
1988 }
1989
1990 static int cm_drep_handler(struct cm_work *work)
1991 {
1992         struct cm_id_private *cm_id_priv;
1993         struct cm_drep_msg *drep_msg;
1994         unsigned long flags;
1995         int ret;
1996
1997         drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
1998         cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id,
1999                                    drep_msg->local_comm_id);
2000         if (!cm_id_priv)
2001                 return -EINVAL;
2002
2003         work->cm_event.private_data = &drep_msg->private_data;
2004
2005         spin_lock_irqsave(&cm_id_priv->lock, flags);
2006         if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
2007             cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
2008                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2009                 goto out;
2010         }
2011         cm_enter_timewait(cm_id_priv);
2012
2013         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2014         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2015         if (!ret)
2016                 list_add_tail(&work->list, &cm_id_priv->work_list);
2017         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2018
2019         if (ret)
2020                 cm_process_work(cm_id_priv, work);
2021         else
2022                 cm_deref_id(cm_id_priv);
2023         return 0;
2024 out:
2025         cm_deref_id(cm_id_priv);
2026         return -EINVAL;
2027 }
2028
2029 int ib_send_cm_rej(struct ib_cm_id *cm_id,
2030                    enum ib_cm_rej_reason reason,
2031                    void *ari,
2032                    u8 ari_length,
2033                    const void *private_data,
2034                    u8 private_data_len)
2035 {
2036         struct cm_id_private *cm_id_priv;
2037         struct ib_mad_send_buf *msg;
2038         unsigned long flags;
2039         int ret;
2040
2041         if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
2042             (ari && ari_length > IB_CM_REJ_ARI_LENGTH))
2043                 return -EINVAL;
2044
2045         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2046
2047         spin_lock_irqsave(&cm_id_priv->lock, flags);
2048         switch (cm_id->state) {
2049         case IB_CM_REQ_SENT:
2050         case IB_CM_MRA_REQ_RCVD:
2051         case IB_CM_REQ_RCVD:
2052         case IB_CM_MRA_REQ_SENT:
2053         case IB_CM_REP_RCVD:
2054         case IB_CM_MRA_REP_SENT:
2055                 ret = cm_alloc_msg(cm_id_priv, &msg);
2056                 if (!ret)
2057                         cm_format_rej((struct cm_rej_msg *) msg->mad,
2058                                       cm_id_priv, reason, ari, ari_length,
2059                                       private_data, private_data_len);
2060
2061                 cm_reset_to_idle(cm_id_priv);
2062                 break;
2063         case IB_CM_REP_SENT:
2064         case IB_CM_MRA_REP_RCVD:
2065                 ret = cm_alloc_msg(cm_id_priv, &msg);
2066                 if (!ret)
2067                         cm_format_rej((struct cm_rej_msg *) msg->mad,
2068                                       cm_id_priv, reason, ari, ari_length,
2069                                       private_data, private_data_len);
2070
2071                 cm_enter_timewait(cm_id_priv);
2072                 break;
2073         default:
2074                 ret = -EINVAL;
2075                 goto out;
2076         }
2077
2078         if (ret)
2079                 goto out;
2080
2081         ret = ib_post_send_mad(msg, NULL);
2082         if (ret)
2083                 cm_free_msg(msg);
2084
2085 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2086         return ret;
2087 }
2088 EXPORT_SYMBOL(ib_send_cm_rej);
2089
2090 static void cm_format_rej_event(struct cm_work *work)
2091 {
2092         struct cm_rej_msg *rej_msg;
2093         struct ib_cm_rej_event_param *param;
2094
2095         rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2096         param = &work->cm_event.param.rej_rcvd;
2097         param->ari = rej_msg->ari;
2098         param->ari_length = cm_rej_get_reject_info_len(rej_msg);
2099         param->reason = __be16_to_cpu(rej_msg->reason);
2100         work->cm_event.private_data = &rej_msg->private_data;
2101 }
2102
2103 static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
2104 {
2105         struct cm_timewait_info *timewait_info;
2106         struct cm_id_private *cm_id_priv;
2107         unsigned long flags;
2108         __be32 remote_id;
2109
2110         remote_id = rej_msg->local_comm_id;
2111
2112         if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) {
2113                 spin_lock_irqsave(&cm.lock, flags);
2114                 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari),
2115                                                   remote_id);
2116                 if (!timewait_info) {
2117                         spin_unlock_irqrestore(&cm.lock, flags);
2118                         return NULL;
2119                 }
2120                 cm_id_priv = idr_find(&cm.local_id_table, (__force int)
2121                                       (timewait_info->work.local_id ^
2122                                        cm.random_id_operand));
2123                 if (cm_id_priv) {
2124                         if (cm_id_priv->id.remote_id == remote_id)
2125                                 atomic_inc(&cm_id_priv->refcount);
2126                         else
2127                                 cm_id_priv = NULL;
2128                 }
2129                 spin_unlock_irqrestore(&cm.lock, flags);
2130         } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ)
2131                 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0);
2132         else
2133                 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id);
2134
2135         return cm_id_priv;
2136 }
2137
2138 static int cm_rej_handler(struct cm_work *work)
2139 {
2140         struct cm_id_private *cm_id_priv;
2141         struct cm_rej_msg *rej_msg;
2142         unsigned long flags;
2143         int ret;
2144
2145         rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2146         cm_id_priv = cm_acquire_rejected_id(rej_msg);
2147         if (!cm_id_priv)
2148                 return -EINVAL;
2149
2150         cm_format_rej_event(work);
2151
2152         spin_lock_irqsave(&cm_id_priv->lock, flags);
2153         switch (cm_id_priv->id.state) {
2154         case IB_CM_REQ_SENT:
2155         case IB_CM_MRA_REQ_RCVD:
2156         case IB_CM_REP_SENT:
2157         case IB_CM_MRA_REP_RCVD:
2158                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2159                 /* fall through */
2160         case IB_CM_REQ_RCVD:
2161         case IB_CM_MRA_REQ_SENT:
2162                 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN)
2163                         cm_enter_timewait(cm_id_priv);
2164                 else
2165                         cm_reset_to_idle(cm_id_priv);
2166                 break;
2167         case IB_CM_DREQ_SENT:
2168                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2169                 /* fall through */
2170         case IB_CM_REP_RCVD:
2171         case IB_CM_MRA_REP_SENT:
2172         case IB_CM_ESTABLISHED:
2173                 cm_enter_timewait(cm_id_priv);
2174                 break;
2175         default:
2176                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2177                 ret = -EINVAL;
2178                 goto out;
2179         }
2180
2181         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2182         if (!ret)
2183                 list_add_tail(&work->list, &cm_id_priv->work_list);
2184         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2185
2186         if (ret)
2187                 cm_process_work(cm_id_priv, work);
2188         else
2189                 cm_deref_id(cm_id_priv);
2190         return 0;
2191 out:
2192         cm_deref_id(cm_id_priv);
2193         return -EINVAL;
2194 }
2195
2196 int ib_send_cm_mra(struct ib_cm_id *cm_id,
2197                    u8 service_timeout,
2198                    const void *private_data,
2199                    u8 private_data_len)
2200 {
2201         struct cm_id_private *cm_id_priv;
2202         struct ib_mad_send_buf *msg;
2203         void *data;
2204         unsigned long flags;
2205         int ret;
2206
2207         if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE)
2208                 return -EINVAL;
2209
2210         data = cm_copy_private_data(private_data, private_data_len);
2211         if (IS_ERR(data))
2212                 return PTR_ERR(data);
2213
2214         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2215
2216         spin_lock_irqsave(&cm_id_priv->lock, flags);
2217         switch(cm_id_priv->id.state) {
2218         case IB_CM_REQ_RCVD:
2219                 ret = cm_alloc_msg(cm_id_priv, &msg);
2220                 if (ret)
2221                         goto error1;
2222
2223                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2224                               CM_MSG_RESPONSE_REQ, service_timeout,
2225                               private_data, private_data_len);
2226                 ret = ib_post_send_mad(msg, NULL);
2227                 if (ret)
2228                         goto error2;
2229                 cm_id->state = IB_CM_MRA_REQ_SENT;
2230                 break;
2231         case IB_CM_REP_RCVD:
2232                 ret = cm_alloc_msg(cm_id_priv, &msg);
2233                 if (ret)
2234                         goto error1;
2235
2236                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2237                               CM_MSG_RESPONSE_REP, service_timeout,
2238                               private_data, private_data_len);
2239                 ret = ib_post_send_mad(msg, NULL);
2240                 if (ret)
2241                         goto error2;
2242                 cm_id->state = IB_CM_MRA_REP_SENT;
2243                 break;
2244         case IB_CM_ESTABLISHED:
2245                 ret = cm_alloc_msg(cm_id_priv, &msg);
2246                 if (ret)
2247                         goto error1;
2248
2249                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2250                               CM_MSG_RESPONSE_OTHER, service_timeout,
2251                               private_data, private_data_len);
2252                 ret = ib_post_send_mad(msg, NULL);
2253                 if (ret)
2254                         goto error2;
2255                 cm_id->lap_state = IB_CM_MRA_LAP_SENT;
2256                 break;
2257         default:
2258                 ret = -EINVAL;
2259                 goto error1;
2260         }
2261         cm_id_priv->service_timeout = service_timeout;
2262         cm_set_private_data(cm_id_priv, data, private_data_len);
2263         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2264         return 0;
2265
2266 error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2267         kfree(data);
2268         return ret;
2269
2270 error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2271         kfree(data);
2272         cm_free_msg(msg);
2273         return ret;
2274 }
2275 EXPORT_SYMBOL(ib_send_cm_mra);
2276
2277 static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
2278 {
2279         switch (cm_mra_get_msg_mraed(mra_msg)) {
2280         case CM_MSG_RESPONSE_REQ:
2281                 return cm_acquire_id(mra_msg->remote_comm_id, 0);
2282         case CM_MSG_RESPONSE_REP:
2283         case CM_MSG_RESPONSE_OTHER:
2284                 return cm_acquire_id(mra_msg->remote_comm_id,
2285                                      mra_msg->local_comm_id);
2286         default:
2287                 return NULL;
2288         }
2289 }
2290
2291 static int cm_mra_handler(struct cm_work *work)
2292 {
2293         struct cm_id_private *cm_id_priv;
2294         struct cm_mra_msg *mra_msg;
2295         unsigned long flags;
2296         int timeout, ret;
2297
2298         mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
2299         cm_id_priv = cm_acquire_mraed_id(mra_msg);
2300         if (!cm_id_priv)
2301                 return -EINVAL;
2302
2303         work->cm_event.private_data = &mra_msg->private_data;
2304         work->cm_event.param.mra_rcvd.service_timeout =
2305                                         cm_mra_get_service_timeout(mra_msg);
2306         timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) +
2307                   cm_convert_to_ms(cm_id_priv->av.packet_life_time);
2308
2309         spin_lock_irqsave(&cm_id_priv->lock, flags);
2310         switch (cm_id_priv->id.state) {
2311         case IB_CM_REQ_SENT:
2312                 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ ||
2313                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
2314                                   cm_id_priv->msg, timeout))
2315                         goto out;
2316                 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
2317                 break;
2318         case IB_CM_REP_SENT:
2319                 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP ||
2320                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
2321                                   cm_id_priv->msg, timeout))
2322                         goto out;
2323                 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
2324                 break;
2325         case IB_CM_ESTABLISHED:
2326                 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER ||
2327                     cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
2328                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
2329                                   cm_id_priv->msg, timeout))
2330                         goto out;
2331                 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
2332                 break;
2333         default:
2334                 goto out;
2335         }
2336
2337         cm_id_priv->msg->context[1] = (void *) (unsigned long)
2338                                       cm_id_priv->id.state;
2339         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2340         if (!ret)
2341                 list_add_tail(&work->list, &cm_id_priv->work_list);
2342         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2343
2344         if (ret)
2345                 cm_process_work(cm_id_priv, work);
2346         else
2347                 cm_deref_id(cm_id_priv);
2348         return 0;
2349 out:
2350         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2351         cm_deref_id(cm_id_priv);
2352         return -EINVAL;
2353 }
2354
2355 static void cm_format_lap(struct cm_lap_msg *lap_msg,
2356                           struct cm_id_private *cm_id_priv,
2357                           struct ib_sa_path_rec *alternate_path,
2358                           const void *private_data,
2359                           u8 private_data_len)
2360 {
2361         cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID,
2362                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP));
2363         lap_msg->local_comm_id = cm_id_priv->id.local_id;
2364         lap_msg->remote_comm_id = cm_id_priv->id.remote_id;
2365         cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn);
2366         /* todo: need remote CM response timeout */
2367         cm_lap_set_remote_resp_timeout(lap_msg, 0x1F);
2368         lap_msg->alt_local_lid = alternate_path->slid;
2369         lap_msg->alt_remote_lid = alternate_path->dlid;
2370         lap_msg->alt_local_gid = alternate_path->sgid;
2371         lap_msg->alt_remote_gid = alternate_path->dgid;
2372         cm_lap_set_flow_label(lap_msg, alternate_path->flow_label);
2373         cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class);
2374         lap_msg->alt_hop_limit = alternate_path->hop_limit;
2375         cm_lap_set_packet_rate(lap_msg, alternate_path->rate);
2376         cm_lap_set_sl(lap_msg, alternate_path->sl);
2377         cm_lap_set_subnet_local(lap_msg, 1); /* local only... */
2378         cm_lap_set_local_ack_timeout(lap_msg,
2379                 min(31, alternate_path->packet_life_time + 1));
2380
2381         if (private_data && private_data_len)
2382                 memcpy(lap_msg->private_data, private_data, private_data_len);
2383 }
2384
2385 int ib_send_cm_lap(struct ib_cm_id *cm_id,
2386                    struct ib_sa_path_rec *alternate_path,
2387                    const void *private_data,
2388                    u8 private_data_len)
2389 {
2390         struct cm_id_private *cm_id_priv;
2391         struct ib_mad_send_buf *msg;
2392         unsigned long flags;
2393         int ret;
2394
2395         if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE)
2396                 return -EINVAL;
2397
2398         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2399         spin_lock_irqsave(&cm_id_priv->lock, flags);
2400         if (cm_id->state != IB_CM_ESTABLISHED ||
2401             (cm_id->lap_state != IB_CM_LAP_UNINIT &&
2402              cm_id->lap_state != IB_CM_LAP_IDLE)) {
2403                 ret = -EINVAL;
2404                 goto out;
2405         }
2406
2407         ret = cm_init_av_by_path(alternate_path, &cm_id_priv->alt_av);
2408         if (ret)
2409                 goto out;
2410
2411         ret = cm_alloc_msg(cm_id_priv, &msg);
2412         if (ret)
2413                 goto out;
2414
2415         cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv,
2416                       alternate_path, private_data, private_data_len);
2417         msg->timeout_ms = cm_id_priv->timeout_ms;
2418         msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED;
2419
2420         ret = ib_post_send_mad(msg, NULL);
2421         if (ret) {
2422                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2423                 cm_free_msg(msg);
2424                 return ret;
2425         }
2426
2427         cm_id->lap_state = IB_CM_LAP_SENT;
2428         cm_id_priv->msg = msg;
2429
2430 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2431         return ret;
2432 }
2433 EXPORT_SYMBOL(ib_send_cm_lap);
2434
2435 static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv,
2436                                     struct ib_sa_path_rec *path,
2437                                     struct cm_lap_msg *lap_msg)
2438 {
2439         memset(path, 0, sizeof *path);
2440         path->dgid = lap_msg->alt_local_gid;
2441         path->sgid = lap_msg->alt_remote_gid;
2442         path->dlid = lap_msg->alt_local_lid;
2443         path->slid = lap_msg->alt_remote_lid;
2444         path->flow_label = cm_lap_get_flow_label(lap_msg);
2445         path->hop_limit = lap_msg->alt_hop_limit;
2446         path->traffic_class = cm_lap_get_traffic_class(lap_msg);
2447         path->reversible = 1;
2448         path->pkey = cm_id_priv->pkey;
2449         path->sl = cm_lap_get_sl(lap_msg);
2450         path->mtu_selector = IB_SA_EQ;
2451         path->mtu = cm_id_priv->path_mtu;
2452         path->rate_selector = IB_SA_EQ;
2453         path->rate = cm_lap_get_packet_rate(lap_msg);
2454         path->packet_life_time_selector = IB_SA_EQ;
2455         path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg);
2456         path->packet_life_time -= (path->packet_life_time > 0);
2457 }
2458
2459 static int cm_lap_handler(struct cm_work *work)
2460 {
2461         struct cm_id_private *cm_id_priv;
2462         struct cm_lap_msg *lap_msg;
2463         struct ib_cm_lap_event_param *param;
2464         struct ib_mad_send_buf *msg = NULL;
2465         unsigned long flags;
2466         int ret;
2467
2468         /* todo: verify LAP request and send reject APR if invalid. */
2469         lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
2470         cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id,
2471                                    lap_msg->local_comm_id);
2472         if (!cm_id_priv)
2473                 return -EINVAL;
2474
2475         param = &work->cm_event.param.lap_rcvd;
2476         param->alternate_path = &work->path[0];
2477         cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg);
2478         work->cm_event.private_data = &lap_msg->private_data;
2479
2480         spin_lock_irqsave(&cm_id_priv->lock, flags);
2481         if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
2482                 goto unlock;
2483
2484         switch (cm_id_priv->id.lap_state) {
2485         case IB_CM_LAP_UNINIT:
2486         case IB_CM_LAP_IDLE:
2487                 break;
2488         case IB_CM_MRA_LAP_SENT:
2489                 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2490                         goto unlock;
2491
2492                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2493                               CM_MSG_RESPONSE_OTHER,
2494                               cm_id_priv->service_timeout,
2495                               cm_id_priv->private_data,
2496                               cm_id_priv->private_data_len);
2497                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2498
2499                 if (ib_post_send_mad(msg, NULL))
2500                         cm_free_msg(msg);
2501                 goto deref;
2502         default:
2503                 goto unlock;
2504         }
2505
2506         cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
2507         cm_id_priv->tid = lap_msg->hdr.tid;
2508         cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2509                                 work->mad_recv_wc->recv_buf.grh,
2510                                 &cm_id_priv->av);
2511         cm_init_av_by_path(param->alternate_path, &cm_id_priv->alt_av);
2512         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2513         if (!ret)
2514                 list_add_tail(&work->list, &cm_id_priv->work_list);
2515         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2516
2517         if (ret)
2518                 cm_process_work(cm_id_priv, work);
2519         else
2520                 cm_deref_id(cm_id_priv);
2521         return 0;
2522
2523 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2524 deref:  cm_deref_id(cm_id_priv);
2525         return -EINVAL;
2526 }
2527
2528 static void cm_format_apr(struct cm_apr_msg *apr_msg,
2529                           struct cm_id_private *cm_id_priv,
2530                           enum ib_cm_apr_status status,
2531                           void *info,
2532                           u8 info_length,
2533                           const void *private_data,
2534                           u8 private_data_len)
2535 {
2536         cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid);
2537         apr_msg->local_comm_id = cm_id_priv->id.local_id;
2538         apr_msg->remote_comm_id = cm_id_priv->id.remote_id;
2539         apr_msg->ap_status = (u8) status;
2540
2541         if (info && info_length) {
2542                 apr_msg->info_length = info_length;
2543                 memcpy(apr_msg->info, info, info_length);
2544         }
2545
2546         if (private_data && private_data_len)
2547                 memcpy(apr_msg->private_data, private_data, private_data_len);
2548 }
2549
2550 int ib_send_cm_apr(struct ib_cm_id *cm_id,
2551                    enum ib_cm_apr_status status,
2552                    void *info,
2553                    u8 info_length,
2554                    const void *private_data,
2555                    u8 private_data_len)
2556 {
2557         struct cm_id_private *cm_id_priv;
2558         struct ib_mad_send_buf *msg;
2559         unsigned long flags;
2560         int ret;
2561
2562         if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) ||
2563             (info && info_length > IB_CM_APR_INFO_LENGTH))
2564                 return -EINVAL;
2565
2566         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2567         spin_lock_irqsave(&cm_id_priv->lock, flags);
2568         if (cm_id->state != IB_CM_ESTABLISHED ||
2569             (cm_id->lap_state != IB_CM_LAP_RCVD &&
2570              cm_id->lap_state != IB_CM_MRA_LAP_SENT)) {
2571                 ret = -EINVAL;
2572                 goto out;
2573         }
2574
2575         ret = cm_alloc_msg(cm_id_priv, &msg);
2576         if (ret)
2577                 goto out;
2578
2579         cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status,
2580                       info, info_length, private_data, private_data_len);
2581         ret = ib_post_send_mad(msg, NULL);
2582         if (ret) {
2583                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2584                 cm_free_msg(msg);
2585                 return ret;
2586         }
2587
2588         cm_id->lap_state = IB_CM_LAP_IDLE;
2589 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2590         return ret;
2591 }
2592 EXPORT_SYMBOL(ib_send_cm_apr);
2593
2594 static int cm_apr_handler(struct cm_work *work)
2595 {
2596         struct cm_id_private *cm_id_priv;
2597         struct cm_apr_msg *apr_msg;
2598         unsigned long flags;
2599         int ret;
2600
2601         apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
2602         cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id,
2603                                    apr_msg->local_comm_id);
2604         if (!cm_id_priv)
2605                 return -EINVAL; /* Unmatched reply. */
2606
2607         work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status;
2608         work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info;
2609         work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length;
2610         work->cm_event.private_data = &apr_msg->private_data;
2611
2612         spin_lock_irqsave(&cm_id_priv->lock, flags);
2613         if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
2614             (cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
2615              cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
2616                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2617                 goto out;
2618         }
2619         cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
2620         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2621         cm_id_priv->msg = NULL;
2622
2623         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2624         if (!ret)
2625                 list_add_tail(&work->list, &cm_id_priv->work_list);
2626         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2627
2628         if (ret)
2629                 cm_process_work(cm_id_priv, work);
2630         else
2631                 cm_deref_id(cm_id_priv);
2632         return 0;
2633 out:
2634         cm_deref_id(cm_id_priv);
2635         return -EINVAL;
2636 }
2637
2638 static int cm_timewait_handler(struct cm_work *work)
2639 {
2640         struct cm_timewait_info *timewait_info;
2641         struct cm_id_private *cm_id_priv;
2642         int ret;
2643
2644         timewait_info = (struct cm_timewait_info *)work;
2645         spin_lock_irq(&cm.lock);
2646         list_del(&timewait_info->list);
2647         spin_unlock_irq(&cm.lock);
2648
2649         cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
2650                                    timewait_info->work.remote_id);
2651         if (!cm_id_priv)
2652                 return -EINVAL;
2653
2654         spin_lock_irq(&cm_id_priv->lock);
2655         if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
2656             cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
2657                 spin_unlock_irq(&cm_id_priv->lock);
2658                 goto out;
2659         }
2660         cm_id_priv->id.state = IB_CM_IDLE;
2661         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2662         if (!ret)
2663                 list_add_tail(&work->list, &cm_id_priv->work_list);
2664         spin_unlock_irq(&cm_id_priv->lock);
2665
2666         if (ret)
2667                 cm_process_work(cm_id_priv, work);
2668         else
2669                 cm_deref_id(cm_id_priv);
2670         return 0;
2671 out:
2672         cm_deref_id(cm_id_priv);
2673         return -EINVAL;
2674 }
2675
2676 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
2677                                struct cm_id_private *cm_id_priv,
2678                                struct ib_cm_sidr_req_param *param)
2679 {
2680         cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
2681                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR));
2682         sidr_req_msg->request_id = cm_id_priv->id.local_id;
2683         sidr_req_msg->pkey = cpu_to_be16(param->path->pkey);
2684         sidr_req_msg->service_id = param->service_id;
2685
2686         if (param->private_data && param->private_data_len)
2687                 memcpy(sidr_req_msg->private_data, param->private_data,
2688                        param->private_data_len);
2689 }
2690
2691 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
2692                         struct ib_cm_sidr_req_param *param)
2693 {
2694         struct cm_id_private *cm_id_priv;
2695         struct ib_mad_send_buf *msg;
2696         unsigned long flags;
2697         int ret;
2698
2699         if (!param->path || (param->private_data &&
2700              param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
2701                 return -EINVAL;
2702
2703         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2704         ret = cm_init_av_by_path(param->path, &cm_id_priv->av);
2705         if (ret)
2706                 goto out;
2707
2708         cm_id->service_id = param->service_id;
2709         cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
2710         cm_id_priv->timeout_ms = param->timeout_ms;
2711         cm_id_priv->max_cm_retries = param->max_cm_retries;
2712         ret = cm_alloc_msg(cm_id_priv, &msg);
2713         if (ret)
2714                 goto out;
2715
2716         cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv,
2717                            param);
2718         msg->timeout_ms = cm_id_priv->timeout_ms;
2719         msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT;
2720
2721         spin_lock_irqsave(&cm_id_priv->lock, flags);
2722         if (cm_id->state == IB_CM_IDLE)
2723                 ret = ib_post_send_mad(msg, NULL);
2724         else
2725                 ret = -EINVAL;
2726
2727         if (ret) {
2728                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2729                 cm_free_msg(msg);
2730                 goto out;
2731         }
2732         cm_id->state = IB_CM_SIDR_REQ_SENT;
2733         cm_id_priv->msg = msg;
2734         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2735 out:
2736         return ret;
2737 }
2738 EXPORT_SYMBOL(ib_send_cm_sidr_req);
2739
2740 static void cm_format_sidr_req_event(struct cm_work *work,
2741                                      struct ib_cm_id *listen_id)
2742 {
2743         struct cm_sidr_req_msg *sidr_req_msg;
2744         struct ib_cm_sidr_req_event_param *param;
2745
2746         sidr_req_msg = (struct cm_sidr_req_msg *)
2747                                 work->mad_recv_wc->recv_buf.mad;
2748         param = &work->cm_event.param.sidr_req_rcvd;
2749         param->pkey = __be16_to_cpu(sidr_req_msg->pkey);
2750         param->listen_id = listen_id;
2751         param->port = work->port->port_num;
2752         work->cm_event.private_data = &sidr_req_msg->private_data;
2753 }
2754
2755 static int cm_sidr_req_handler(struct cm_work *work)
2756 {
2757         struct ib_cm_id *cm_id;
2758         struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
2759         struct cm_sidr_req_msg *sidr_req_msg;
2760         struct ib_wc *wc;
2761         unsigned long flags;
2762
2763         cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL);
2764         if (IS_ERR(cm_id))
2765                 return PTR_ERR(cm_id);
2766         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2767
2768         /* Record SGID/SLID and request ID for lookup. */
2769         sidr_req_msg = (struct cm_sidr_req_msg *)
2770                                 work->mad_recv_wc->recv_buf.mad;
2771         wc = work->mad_recv_wc->wc;
2772         cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid);
2773         cm_id_priv->av.dgid.global.interface_id = 0;
2774         cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2775                                 work->mad_recv_wc->recv_buf.grh,
2776                                 &cm_id_priv->av);
2777         cm_id_priv->id.remote_id = sidr_req_msg->request_id;
2778         cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
2779         cm_id_priv->tid = sidr_req_msg->hdr.tid;
2780         atomic_inc(&cm_id_priv->work_count);
2781
2782         spin_lock_irqsave(&cm.lock, flags);
2783         cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
2784         if (cur_cm_id_priv) {
2785                 spin_unlock_irqrestore(&cm.lock, flags);
2786                 goto out; /* Duplicate message. */
2787         }
2788         cur_cm_id_priv = cm_find_listen(cm_id->device,
2789                                         sidr_req_msg->service_id,
2790                                         sidr_req_msg->private_data);
2791         if (!cur_cm_id_priv) {
2792                 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
2793                 spin_unlock_irqrestore(&cm.lock, flags);
2794                 /* todo: reply with no match */
2795                 goto out; /* No match. */
2796         }
2797         atomic_inc(&cur_cm_id_priv->refcount);
2798         spin_unlock_irqrestore(&cm.lock, flags);
2799
2800         cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler;
2801         cm_id_priv->id.context = cur_cm_id_priv->id.context;
2802         cm_id_priv->id.service_id = sidr_req_msg->service_id;
2803         cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL);
2804
2805         cm_format_sidr_req_event(work, &cur_cm_id_priv->id);
2806         cm_process_work(cm_id_priv, work);
2807         cm_deref_id(cur_cm_id_priv);
2808         return 0;
2809 out:
2810         ib_destroy_cm_id(&cm_id_priv->id);
2811         return -EINVAL;
2812 }
2813
2814 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
2815                                struct cm_id_private *cm_id_priv,
2816                                struct ib_cm_sidr_rep_param *param)
2817 {
2818         cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
2819                           cm_id_priv->tid);
2820         sidr_rep_msg->request_id = cm_id_priv->id.remote_id;
2821         sidr_rep_msg->status = param->status;
2822         cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num));
2823         sidr_rep_msg->service_id = cm_id_priv->id.service_id;
2824         sidr_rep_msg->qkey = cpu_to_be32(param->qkey);
2825
2826         if (param->info && param->info_length)
2827                 memcpy(sidr_rep_msg->info, param->info, param->info_length);
2828
2829         if (param->private_data && param->private_data_len)
2830                 memcpy(sidr_rep_msg->private_data, param->private_data,
2831                        param->private_data_len);
2832 }
2833
2834 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
2835                         struct ib_cm_sidr_rep_param *param)
2836 {
2837         struct cm_id_private *cm_id_priv;
2838         struct ib_mad_send_buf *msg;
2839         unsigned long flags;
2840         int ret;
2841
2842         if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
2843             (param->private_data &&
2844              param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE))
2845                 return -EINVAL;
2846
2847         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2848         spin_lock_irqsave(&cm_id_priv->lock, flags);
2849         if (cm_id->state != IB_CM_SIDR_REQ_RCVD) {
2850                 ret = -EINVAL;
2851                 goto error;
2852         }
2853
2854         ret = cm_alloc_msg(cm_id_priv, &msg);
2855         if (ret)
2856                 goto error;
2857
2858         cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
2859                            param);
2860         ret = ib_post_send_mad(msg, NULL);
2861         if (ret) {
2862                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2863                 cm_free_msg(msg);
2864                 return ret;
2865         }
2866         cm_id->state = IB_CM_IDLE;
2867         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2868
2869         spin_lock_irqsave(&cm.lock, flags);
2870         rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
2871         spin_unlock_irqrestore(&cm.lock, flags);
2872         return 0;
2873
2874 error:  spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2875         return ret;
2876 }
2877 EXPORT_SYMBOL(ib_send_cm_sidr_rep);
2878
2879 static void cm_format_sidr_rep_event(struct cm_work *work)
2880 {
2881         struct cm_sidr_rep_msg *sidr_rep_msg;
2882         struct ib_cm_sidr_rep_event_param *param;
2883
2884         sidr_rep_msg = (struct cm_sidr_rep_msg *)
2885                                 work->mad_recv_wc->recv_buf.mad;
2886         param = &work->cm_event.param.sidr_rep_rcvd;
2887         param->status = sidr_rep_msg->status;
2888         param->qkey = be32_to_cpu(sidr_rep_msg->qkey);
2889         param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg));
2890         param->info = &sidr_rep_msg->info;
2891         param->info_len = sidr_rep_msg->info_length;
2892         work->cm_event.private_data = &sidr_rep_msg->private_data;
2893 }
2894
2895 static int cm_sidr_rep_handler(struct cm_work *work)
2896 {
2897         struct cm_sidr_rep_msg *sidr_rep_msg;
2898         struct cm_id_private *cm_id_priv;
2899         unsigned long flags;
2900
2901         sidr_rep_msg = (struct cm_sidr_rep_msg *)
2902                                 work->mad_recv_wc->recv_buf.mad;
2903         cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0);
2904         if (!cm_id_priv)
2905                 return -EINVAL; /* Unmatched reply. */
2906
2907         spin_lock_irqsave(&cm_id_priv->lock, flags);
2908         if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
2909                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2910                 goto out;
2911         }
2912         cm_id_priv->id.state = IB_CM_IDLE;
2913         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2914         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2915
2916         cm_format_sidr_rep_event(work);
2917         cm_process_work(cm_id_priv, work);
2918         return 0;
2919 out:
2920         cm_deref_id(cm_id_priv);
2921         return -EINVAL;
2922 }
2923
2924 static void cm_process_send_error(struct ib_mad_send_buf *msg,
2925                                   enum ib_wc_status wc_status)
2926 {
2927         struct cm_id_private *cm_id_priv;
2928         struct ib_cm_event cm_event;
2929         enum ib_cm_state state;
2930         unsigned long flags;
2931         int ret;
2932
2933         memset(&cm_event, 0, sizeof cm_event);
2934         cm_id_priv = msg->context[0];
2935
2936         /* Discard old sends or ones without a response. */
2937         spin_lock_irqsave(&cm_id_priv->lock, flags);
2938         state = (enum ib_cm_state) (unsigned long) msg->context[1];
2939         if (msg != cm_id_priv->msg || state != cm_id_priv->id.state)
2940                 goto discard;
2941
2942         switch (state) {
2943         case IB_CM_REQ_SENT:
2944         case IB_CM_MRA_REQ_RCVD:
2945                 cm_reset_to_idle(cm_id_priv);
2946                 cm_event.event = IB_CM_REQ_ERROR;
2947                 break;
2948         case IB_CM_REP_SENT:
2949         case IB_CM_MRA_REP_RCVD:
2950                 cm_reset_to_idle(cm_id_priv);
2951                 cm_event.event = IB_CM_REP_ERROR;
2952                 break;
2953         case IB_CM_DREQ_SENT:
2954                 cm_enter_timewait(cm_id_priv);
2955                 cm_event.event = IB_CM_DREQ_ERROR;
2956                 break;
2957         case IB_CM_SIDR_REQ_SENT:
2958                 cm_id_priv->id.state = IB_CM_IDLE;
2959                 cm_event.event = IB_CM_SIDR_REQ_ERROR;
2960                 break;
2961         default:
2962                 goto discard;
2963         }
2964         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2965         cm_event.param.send_status = wc_status;
2966
2967         /* No other events can occur on the cm_id at this point. */
2968         ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
2969         cm_free_msg(msg);
2970         if (ret)
2971                 ib_destroy_cm_id(&cm_id_priv->id);
2972         return;
2973 discard:
2974         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2975         cm_free_msg(msg);
2976 }
2977
2978 static void cm_send_handler(struct ib_mad_agent *mad_agent,
2979                             struct ib_mad_send_wc *mad_send_wc)
2980 {
2981         struct ib_mad_send_buf *msg = mad_send_wc->send_buf;
2982
2983         switch (mad_send_wc->status) {
2984         case IB_WC_SUCCESS:
2985         case IB_WC_WR_FLUSH_ERR:
2986                 cm_free_msg(msg);
2987                 break;
2988         default:
2989                 if (msg->context[0] && msg->context[1])
2990                         cm_process_send_error(msg, mad_send_wc->status);
2991                 else
2992                         cm_free_msg(msg);
2993                 break;
2994         }
2995 }
2996
2997 static void cm_work_handler(struct work_struct *_work)
2998 {
2999         struct cm_work *work = container_of(_work, struct cm_work, work.work);
3000         int ret;
3001
3002         switch (work->cm_event.event) {
3003         case IB_CM_REQ_RECEIVED:
3004                 ret = cm_req_handler(work);
3005                 break;
3006         case IB_CM_MRA_RECEIVED:
3007                 ret = cm_mra_handler(work);
3008                 break;
3009         case IB_CM_REJ_RECEIVED:
3010                 ret = cm_rej_handler(work);
3011                 break;
3012         case IB_CM_REP_RECEIVED:
3013                 ret = cm_rep_handler(work);
3014                 break;
3015         case IB_CM_RTU_RECEIVED:
3016                 ret = cm_rtu_handler(work);
3017                 break;
3018         case IB_CM_USER_ESTABLISHED:
3019                 ret = cm_establish_handler(work);
3020                 break;
3021         case IB_CM_DREQ_RECEIVED:
3022                 ret = cm_dreq_handler(work);
3023                 break;
3024         case IB_CM_DREP_RECEIVED:
3025                 ret = cm_drep_handler(work);
3026                 break;
3027         case IB_CM_SIDR_REQ_RECEIVED:
3028                 ret = cm_sidr_req_handler(work);
3029                 break;
3030         case IB_CM_SIDR_REP_RECEIVED:
3031                 ret = cm_sidr_rep_handler(work);
3032                 break;
3033         case IB_CM_LAP_RECEIVED:
3034                 ret = cm_lap_handler(work);
3035                 break;
3036         case IB_CM_APR_RECEIVED:
3037                 ret = cm_apr_handler(work);
3038                 break;
3039         case IB_CM_TIMEWAIT_EXIT:
3040                 ret = cm_timewait_handler(work);
3041                 break;
3042         default:
3043                 ret = -EINVAL;
3044                 break;
3045         }
3046         if (ret)
3047                 cm_free_work(work);
3048 }
3049
3050 static int cm_establish(struct ib_cm_id *cm_id)
3051 {
3052         struct cm_id_private *cm_id_priv;
3053         struct cm_work *work;
3054         unsigned long flags;
3055         int ret = 0;
3056
3057         work = kmalloc(sizeof *work, GFP_ATOMIC);
3058         if (!work)
3059                 return -ENOMEM;
3060
3061         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3062         spin_lock_irqsave(&cm_id_priv->lock, flags);
3063         switch (cm_id->state)
3064         {
3065         case IB_CM_REP_SENT:
3066         case IB_CM_MRA_REP_RCVD:
3067                 cm_id->state = IB_CM_ESTABLISHED;
3068                 break;
3069         case IB_CM_ESTABLISHED:
3070                 ret = -EISCONN;
3071                 break;
3072         default:
3073                 ret = -EINVAL;
3074                 break;
3075         }
3076         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3077
3078         if (ret) {
3079                 kfree(work);
3080                 goto out;
3081         }
3082
3083         /*
3084          * The CM worker thread may try to destroy the cm_id before it
3085          * can execute this work item.  To prevent potential deadlock,
3086          * we need to find the cm_id once we're in the context of the
3087          * worker thread, rather than holding a reference on it.
3088          */
3089         INIT_DELAYED_WORK(&work->work, cm_work_handler);
3090         work->local_id = cm_id->local_id;
3091         work->remote_id = cm_id->remote_id;
3092         work->mad_recv_wc = NULL;
3093         work->cm_event.event = IB_CM_USER_ESTABLISHED;
3094         queue_delayed_work(cm.wq, &work->work, 0);
3095 out:
3096         return ret;
3097 }
3098
3099 static int cm_migrate(struct ib_cm_id *cm_id)
3100 {
3101         struct cm_id_private *cm_id_priv;
3102         unsigned long flags;
3103         int ret = 0;
3104
3105         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3106         spin_lock_irqsave(&cm_id_priv->lock, flags);
3107         if (cm_id->state == IB_CM_ESTABLISHED &&
3108             (cm_id->lap_state == IB_CM_LAP_UNINIT ||
3109              cm_id->lap_state == IB_CM_LAP_IDLE)) {
3110                 cm_id->lap_state = IB_CM_LAP_IDLE;
3111                 cm_id_priv->av = cm_id_priv->alt_av;
3112         } else
3113                 ret = -EINVAL;
3114         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3115
3116         return ret;
3117 }
3118
3119 int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event)
3120 {
3121         int ret;
3122
3123         switch (event) {
3124         case IB_EVENT_COMM_EST:
3125                 ret = cm_establish(cm_id);
3126                 break;
3127         case IB_EVENT_PATH_MIG:
3128                 ret = cm_migrate(cm_id);
3129                 break;
3130         default:
3131                 ret = -EINVAL;
3132         }
3133         return ret;
3134 }
3135 EXPORT_SYMBOL(ib_cm_notify);
3136
3137 static void cm_recv_handler(struct ib_mad_agent *mad_agent,
3138                             struct ib_mad_recv_wc *mad_recv_wc)
3139 {
3140         struct cm_work *work;
3141         enum ib_cm_event_type event;
3142         int paths = 0;
3143
3144         switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
3145         case CM_REQ_ATTR_ID:
3146                 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)->
3147                                                     alt_local_lid != 0);
3148                 event = IB_CM_REQ_RECEIVED;
3149                 break;
3150         case CM_MRA_ATTR_ID:
3151                 event = IB_CM_MRA_RECEIVED;
3152                 break;
3153         case CM_REJ_ATTR_ID:
3154                 event = IB_CM_REJ_RECEIVED;
3155                 break;
3156         case CM_REP_ATTR_ID:
3157                 event = IB_CM_REP_RECEIVED;
3158                 break;
3159         case CM_RTU_ATTR_ID:
3160                 event = IB_CM_RTU_RECEIVED;
3161                 break;
3162         case CM_DREQ_ATTR_ID:
3163                 event = IB_CM_DREQ_RECEIVED;
3164                 break;
3165         case CM_DREP_ATTR_ID:
3166                 event = IB_CM_DREP_RECEIVED;
3167                 break;
3168         case CM_SIDR_REQ_ATTR_ID:
3169                 event = IB_CM_SIDR_REQ_RECEIVED;
3170                 break;
3171         case CM_SIDR_REP_ATTR_ID:
3172                 event = IB_CM_SIDR_REP_RECEIVED;
3173                 break;
3174         case CM_LAP_ATTR_ID:
3175                 paths = 1;
3176                 event = IB_CM_LAP_RECEIVED;
3177                 break;
3178         case CM_APR_ATTR_ID:
3179                 event = IB_CM_APR_RECEIVED;
3180                 break;
3181         default:
3182                 ib_free_recv_mad(mad_recv_wc);
3183                 return;
3184         }
3185
3186         work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths,
3187                        GFP_KERNEL);
3188         if (!work) {
3189                 ib_free_recv_mad(mad_recv_wc);
3190                 return;
3191         }
3192
3193         INIT_DELAYED_WORK(&work->work, cm_work_handler);
3194         work->cm_event.event = event;
3195         work->mad_recv_wc = mad_recv_wc;
3196         work->port = (struct cm_port *)mad_agent->context;
3197         queue_delayed_work(cm.wq, &work->work, 0);
3198 }
3199
3200 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
3201                                 struct ib_qp_attr *qp_attr,
3202                                 int *qp_attr_mask)
3203 {
3204         unsigned long flags;
3205         int ret;
3206
3207         spin_lock_irqsave(&cm_id_priv->lock, flags);
3208         switch (cm_id_priv->id.state) {
3209         case IB_CM_REQ_SENT:
3210         case IB_CM_MRA_REQ_RCVD:
3211         case IB_CM_REQ_RCVD:
3212         case IB_CM_MRA_REQ_SENT:
3213         case IB_CM_REP_RCVD:
3214         case IB_CM_MRA_REP_SENT:
3215         case IB_CM_REP_SENT:
3216         case IB_CM_MRA_REP_RCVD:
3217         case IB_CM_ESTABLISHED:
3218                 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
3219                                 IB_QP_PKEY_INDEX | IB_QP_PORT;
3220                 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE;
3221                 if (cm_id_priv->responder_resources)
3222                         qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ |
3223                                                     IB_ACCESS_REMOTE_ATOMIC;
3224                 qp_attr->pkey_index = cm_id_priv->av.pkey_index;
3225                 qp_attr->port_num = cm_id_priv->av.port->port_num;
3226                 ret = 0;
3227                 break;
3228         default:
3229                 ret = -EINVAL;
3230                 break;
3231         }
3232         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3233         return ret;
3234 }
3235
3236 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
3237                                struct ib_qp_attr *qp_attr,
3238                                int *qp_attr_mask)
3239 {
3240         unsigned long flags;
3241         int ret;
3242
3243         spin_lock_irqsave(&cm_id_priv->lock, flags);
3244         switch (cm_id_priv->id.state) {
3245         case IB_CM_REQ_RCVD:
3246         case IB_CM_MRA_REQ_SENT:
3247         case IB_CM_REP_RCVD:
3248         case IB_CM_MRA_REP_SENT:
3249         case IB_CM_REP_SENT:
3250         case IB_CM_MRA_REP_RCVD:
3251         case IB_CM_ESTABLISHED:
3252                 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
3253                                 IB_QP_DEST_QPN | IB_QP_RQ_PSN;
3254                 qp_attr->ah_attr = cm_id_priv->av.ah_attr;
3255                 qp_attr->path_mtu = cm_id_priv->path_mtu;
3256                 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
3257                 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
3258                 if (cm_id_priv->qp_type == IB_QPT_RC) {
3259                         *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC |
3260                                          IB_QP_MIN_RNR_TIMER;
3261                         qp_attr->max_dest_rd_atomic =
3262                                         cm_id_priv->responder_resources;
3263                         qp_attr->min_rnr_timer = 0;
3264                 }
3265                 if (cm_id_priv->alt_av.ah_attr.dlid) {
3266                         *qp_attr_mask |= IB_QP_ALT_PATH;
3267                         qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
3268                         qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
3269                         qp_attr->alt_timeout =
3270                                         cm_id_priv->alt_av.packet_life_time + 1;
3271                         qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3272                 }
3273                 ret = 0;
3274                 break;
3275         default:
3276                 ret = -EINVAL;
3277                 break;
3278         }
3279         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3280         return ret;
3281 }
3282
3283 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv,
3284                                struct ib_qp_attr *qp_attr,
3285                                int *qp_attr_mask)
3286 {
3287         unsigned long flags;
3288         int ret;
3289
3290         spin_lock_irqsave(&cm_id_priv->lock, flags);
3291         switch (cm_id_priv->id.state) {
3292         /* Allow transition to RTS before sending REP */
3293         case IB_CM_REQ_RCVD:
3294         case IB_CM_MRA_REQ_SENT:
3295
3296         case IB_CM_REP_RCVD:
3297         case IB_CM_MRA_REP_SENT:
3298         case IB_CM_REP_SENT:
3299         case IB_CM_MRA_REP_RCVD:
3300         case IB_CM_ESTABLISHED:
3301                 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) {
3302                         *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN;
3303                         qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn);
3304                         if (cm_id_priv->qp_type == IB_QPT_RC) {
3305                                 *qp_attr_mask |= IB_QP_TIMEOUT | IB_QP_RETRY_CNT |
3306                                                  IB_QP_RNR_RETRY |
3307                                                  IB_QP_MAX_QP_RD_ATOMIC;
3308                                 qp_attr->timeout =
3309                                         cm_id_priv->av.packet_life_time + 1;
3310                                 qp_attr->retry_cnt = cm_id_priv->retry_count;
3311                                 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count;
3312                                 qp_attr->max_rd_atomic =
3313                                         cm_id_priv->initiator_depth;
3314                         }
3315                         if (cm_id_priv->alt_av.ah_attr.dlid) {
3316                                 *qp_attr_mask |= IB_QP_PATH_MIG_STATE;
3317                                 qp_attr->path_mig_state = IB_MIG_REARM;
3318                         }
3319                 } else {
3320                         *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE;
3321                         qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
3322                         qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
3323                         qp_attr->alt_timeout =
3324                                 cm_id_priv->alt_av.packet_life_time + 1;
3325                         qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3326                         qp_attr->path_mig_state = IB_MIG_REARM;
3327                 }
3328                 ret = 0;
3329                 break;
3330         default:
3331                 ret = -EINVAL;
3332                 break;
3333         }
3334         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3335         return ret;
3336 }
3337
3338 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
3339                        struct ib_qp_attr *qp_attr,
3340                        int *qp_attr_mask)
3341 {
3342         struct cm_id_private *cm_id_priv;
3343         int ret;
3344
3345         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3346         switch (qp_attr->qp_state) {
3347         case IB_QPS_INIT:
3348                 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask);
3349                 break;
3350         case IB_QPS_RTR:
3351                 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask);
3352                 break;
3353         case IB_QPS_RTS:
3354                 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask);
3355                 break;
3356         default:
3357                 ret = -EINVAL;
3358                 break;
3359         }
3360         return ret;
3361 }
3362 EXPORT_SYMBOL(ib_cm_init_qp_attr);
3363
3364 static void cm_add_one(struct ib_device *device)
3365 {
3366         struct cm_device *cm_dev;
3367         struct cm_port *port;
3368         struct ib_mad_reg_req reg_req = {
3369                 .mgmt_class = IB_MGMT_CLASS_CM,
3370                 .mgmt_class_version = IB_CM_CLASS_VERSION
3371         };
3372         struct ib_port_modify port_modify = {
3373                 .set_port_cap_mask = IB_PORT_CM_SUP
3374         };
3375         unsigned long flags;
3376         int ret;
3377         u8 i;
3378
3379         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
3380                 return;
3381
3382         cm_dev = kmalloc(sizeof(*cm_dev) + sizeof(*port) *
3383                          device->phys_port_cnt, GFP_KERNEL);
3384         if (!cm_dev)
3385                 return;
3386
3387         cm_dev->device = device;
3388         cm_dev->ca_guid = device->node_guid;
3389
3390         set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
3391         for (i = 1; i <= device->phys_port_cnt; i++) {
3392                 port = &cm_dev->port[i-1];
3393                 port->cm_dev = cm_dev;
3394                 port->port_num = i;
3395                 port->mad_agent = ib_register_mad_agent(device, i,
3396                                                         IB_QPT_GSI,
3397                                                         &reg_req,
3398                                                         0,
3399                                                         cm_send_handler,
3400                                                         cm_recv_handler,
3401                                                         port);
3402                 if (IS_ERR(port->mad_agent))
3403                         goto error1;
3404
3405                 ret = ib_modify_port(device, i, 0, &port_modify);
3406                 if (ret)
3407                         goto error2;
3408         }
3409         ib_set_client_data(device, &cm_client, cm_dev);
3410
3411         write_lock_irqsave(&cm.device_lock, flags);
3412         list_add_tail(&cm_dev->list, &cm.device_list);
3413         write_unlock_irqrestore(&cm.device_lock, flags);
3414         return;
3415
3416 error2:
3417         ib_unregister_mad_agent(port->mad_agent);
3418 error1:
3419         port_modify.set_port_cap_mask = 0;
3420         port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
3421         while (--i) {
3422                 port = &cm_dev->port[i-1];
3423                 ib_modify_port(device, port->port_num, 0, &port_modify);
3424                 ib_unregister_mad_agent(port->mad_agent);
3425         }
3426         kfree(cm_dev);
3427 }
3428
3429 static void cm_remove_one(struct ib_device *device)
3430 {
3431         struct cm_device *cm_dev;
3432         struct cm_port *port;
3433         struct ib_port_modify port_modify = {
3434                 .clr_port_cap_mask = IB_PORT_CM_SUP
3435         };
3436         unsigned long flags;
3437         int i;
3438
3439         cm_dev = ib_get_client_data(device, &cm_client);
3440         if (!cm_dev)
3441                 return;
3442
3443         write_lock_irqsave(&cm.device_lock, flags);
3444         list_del(&cm_dev->list);
3445         write_unlock_irqrestore(&cm.device_lock, flags);
3446
3447         for (i = 1; i <= device->phys_port_cnt; i++) {
3448                 port = &cm_dev->port[i-1];
3449                 ib_modify_port(device, port->port_num, 0, &port_modify);
3450                 ib_unregister_mad_agent(port->mad_agent);
3451         }
3452         kfree(cm_dev);
3453 }
3454
3455 static int __init ib_cm_init(void)
3456 {
3457         int ret;
3458
3459         memset(&cm, 0, sizeof cm);
3460         INIT_LIST_HEAD(&cm.device_list);
3461         rwlock_init(&cm.device_lock);
3462         spin_lock_init(&cm.lock);
3463         cm.listen_service_table = RB_ROOT;
3464         cm.listen_service_id = __constant_be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID);
3465         cm.remote_id_table = RB_ROOT;
3466         cm.remote_qp_table = RB_ROOT;
3467         cm.remote_sidr_table = RB_ROOT;
3468         idr_init(&cm.local_id_table);
3469         get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand);
3470         idr_pre_get(&cm.local_id_table, GFP_KERNEL);
3471         INIT_LIST_HEAD(&cm.timewait_list);
3472
3473         cm.wq = create_workqueue("ib_cm");
3474         if (!cm.wq)
3475                 return -ENOMEM;
3476
3477         ret = ib_register_client(&cm_client);
3478         if (ret)
3479                 goto error;
3480
3481         return 0;
3482 error:
3483         destroy_workqueue(cm.wq);
3484         return ret;
3485 }
3486
3487 static void __exit ib_cm_cleanup(void)
3488 {
3489         struct cm_timewait_info *timewait_info, *tmp;
3490
3491         spin_lock_irq(&cm.lock);
3492         list_for_each_entry(timewait_info, &cm.timewait_list, list)
3493                 cancel_delayed_work(&timewait_info->work.work);
3494         spin_unlock_irq(&cm.lock);
3495
3496         destroy_workqueue(cm.wq);
3497
3498         list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) {
3499                 list_del(&timewait_info->list);
3500                 kfree(timewait_info);
3501         }
3502
3503         ib_unregister_client(&cm_client);
3504         idr_destroy(&cm.local_id_table);
3505 }
3506
3507 module_init(ib_cm_init);
3508 module_exit(ib_cm_cleanup);
3509