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

   1 /*
   2  * Copyright (c) 2004-2006 Intel Corporation.  All rights reserved.
   3  * Copyright (c) 2004 Topspin Corporation.  All rights reserved.
   4  * Copyright (c) 2004, 2005 Voltaire Corporation.  All rights reserved.
   5  * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
   6  *
   7  * This software is available to you under a choice of one of two
   8  * licenses.  You may choose to be licensed under the terms of the GNU
   9  * General Public License (GPL) Version 2, available from the file
  10  * COPYING in the main directory of this source tree, or the
  11  * OpenIB.org BSD license below:
  12  *
  13  *     Redistribution and use in source and binary forms, with or
  14  *     without modification, are permitted provided that the following
  15  *     conditions are met:
  16  *
  17  *      - Redistributions of source code must retain the above
  18  *        copyright notice, this list of conditions and the following
  19  *        disclaimer.
  20  *
  21  *      - Redistributions in binary form must reproduce the above
  22  *        copyright notice, this list of conditions and the following
  23  *        disclaimer in the documentation and/or other materials
  24  *        provided with the distribution.
  25  *
  26  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  27  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  28  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  29  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  30  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  31  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  32  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  33  * SOFTWARE.
  34  *
  35  * $Id: cm.c 4311 2005-12-05 18:42:01Z sean.hefty $
  36  */
  37
  38 #include <linux/completion.h>
  39 #include <linux/dma-mapping.h>
  40 #include <linux/err.h>
  41 #include <linux/idr.h>
  42 #include <linux/interrupt.h>
  43 #include <linux/random.h>
  44 #include <linux/rbtree.h>
  45 #include <linux/spinlock.h>
  46 #include <linux/workqueue.h>
  47
  48 #include <rdma/ib_cache.h>
  49 #include <rdma/ib_cm.h>
  50 #include "cm_msgs.h"
  51
  52 MODULE_AUTHOR("Sean Hefty");
  53 MODULE_DESCRIPTION("InfiniBand CM");
  54 MODULE_LICENSE("Dual BSD/GPL");
  55
  56 static void cm_add_one(struct ib_device *device);
  57 static void cm_remove_one(struct ib_device *device);
  58
  59 static struct ib_client cm_client = {
  60         .name   = "cm",
  61         .add    = cm_add_one,
  62         .remove = cm_remove_one
  63 };
  64
  65 static struct ib_cm {
  66         spinlock_t lock;
  67         struct list_head device_list;
  68         rwlock_t device_lock;
  69         struct rb_root listen_service_table;
  70         u64 listen_service_id;
  71         /* struct rb_root peer_service_table; todo: fix peer to peer */
  72         struct rb_root remote_qp_table;
  73         struct rb_root remote_id_table;
  74         struct rb_root remote_sidr_table;
  75         struct idr local_id_table;
  76         __be32 random_id_operand;
  77         struct list_head timewait_list;
  78         struct workqueue_struct *wq;
  79 } cm;
  80
  81 struct cm_port {
  82         struct cm_device *cm_dev;
  83         struct ib_mad_agent *mad_agent;
  84         u8 port_num;
  85 };
  86
  87 struct cm_device {
  88         struct list_head list;
  89         struct ib_device *device;
  90         struct cm_port port[0];
  91 };
  92
  93 struct cm_av {
  94         struct cm_port *port;
  95         union ib_gid dgid;
  96         struct ib_ah_attr ah_attr;
  97         u16 pkey_index;
  98         u8 packet_life_time;
  99 };
 100
 101 struct cm_work {
 102         struct delayed_work work;
 103         struct list_head list;
 104         struct cm_port *port;
 105         struct ib_mad_recv_wc *mad_recv_wc;     /* Received MADs */
 106         __be32 local_id;                        /* Established / timewait */
 107         __be32 remote_id;
 108         struct ib_cm_event cm_event;
 109         struct ib_sa_path_rec path[0];
 110 };
 111
 112 struct cm_timewait_info {
 113         struct cm_work work;                    /* Must be first. */
 114         struct list_head list;
 115         struct rb_node remote_qp_node;
 116         struct rb_node remote_id_node;
 117         __be64 remote_ca_guid;
 118         __be32 remote_qpn;
 119         u8 inserted_remote_qp;
 120         u8 inserted_remote_id;
 121 };
 122
 123 struct cm_id_private {
 124         struct ib_cm_id id;
 125
 126         struct rb_node service_node;
 127         struct rb_node sidr_id_node;
 128         spinlock_t lock;        /* Do not acquire inside cm.lock */
 129         struct completion comp;
 130         atomic_t refcount;
 131
 132         struct ib_mad_send_buf *msg;
 133         struct cm_timewait_info *timewait_info;
 134         /* todo: use alternate port on send failure */
 135         struct cm_av av;
 136         struct cm_av alt_av;
 137         struct ib_cm_compare_data *compare_data;
 138
 139         void *private_data;
 140         __be64 tid;
 141         __be32 local_qpn;
 142         __be32 remote_qpn;
 143         enum ib_qp_type qp_type;
 144         __be32 sq_psn;
 145         __be32 rq_psn;
 146         int timeout_ms;
 147         enum ib_mtu path_mtu;
 148         __be16 pkey;
 149         u8 private_data_len;
 150         u8 max_cm_retries;
 151         u8 peer_to_peer;
 152         u8 responder_resources;
 153         u8 initiator_depth;
 154         u8 retry_count;
 155         u8 rnr_retry_count;
 156         u8 service_timeout;
 157
 158         struct list_head work_list;
 159         atomic_t work_count;
 160 };
 161
 162 static void cm_work_handler(struct work_struct *work);
 163
 164 static inline void cm_deref_id(struct cm_id_private *cm_id_priv)
 165 {
 166         if (atomic_dec_and_test(&cm_id_priv->refcount))
 167                 complete(&cm_id_priv->comp);
 168 }
 169
 170 static int cm_alloc_msg(struct cm_id_private *cm_id_priv,
 171                         struct ib_mad_send_buf **msg)
 172 {
 173         struct ib_mad_agent *mad_agent;
 174         struct ib_mad_send_buf *m;
 175         struct ib_ah *ah;
 176
 177         mad_agent = cm_id_priv->av.port->mad_agent;
 178         ah = ib_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr);
 179         if (IS_ERR(ah))
 180                 return PTR_ERR(ah);
 181
 182         m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn,
 183                                cm_id_priv->av.pkey_index,
 184                                0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
 185                                GFP_ATOMIC);
 186         if (IS_ERR(m)) {
 187                 ib_destroy_ah(ah);
 188                 return PTR_ERR(m);
 189         }
 190
 191         /* Timeout set by caller if response is expected. */
 192         m->ah = ah;
 193         m->retries = cm_id_priv->max_cm_retries;
 194
 195         atomic_inc(&cm_id_priv->refcount);
 196         m->context[0] = cm_id_priv;
 197         *msg = m;
 198         return 0;
 199 }
 200
 201 static int cm_alloc_response_msg(struct cm_port *port,
 202                                  struct ib_mad_recv_wc *mad_recv_wc,
 203                                  struct ib_mad_send_buf **msg)
 204 {
 205         struct ib_mad_send_buf *m;
 206         struct ib_ah *ah;
 207
 208         ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc,
 209                                   mad_recv_wc->recv_buf.grh, port->port_num);
 210         if (IS_ERR(ah))
 211                 return PTR_ERR(ah);
 212
 213         m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index,
 214                                0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
 215                                GFP_ATOMIC);
 216         if (IS_ERR(m)) {
 217                 ib_destroy_ah(ah);
 218                 return PTR_ERR(m);
 219         }
 220         m->ah = ah;
 221         *msg = m;
 222         return 0;
 223 }
 224
 225 static void cm_free_msg(struct ib_mad_send_buf *msg)
 226 {
 227         ib_destroy_ah(msg->ah);
 228         if (msg->context[0])
 229                 cm_deref_id(msg->context[0]);
 230         ib_free_send_mad(msg);
 231 }
 232
 233 static void * cm_copy_private_data(const void *private_data,
 234                                    u8 private_data_len)
 235 {
 236         void *data;
 237
 238         if (!private_data || !private_data_len)
 239                 return NULL;
 240
 241         data = kmemdup(private_data, private_data_len, GFP_KERNEL);
 242         if (!data)
 243                 return ERR_PTR(-ENOMEM);
 244
 245         return data;
 246 }
 247
 248 static void cm_set_private_data(struct cm_id_private *cm_id_priv,
 249                                  void *private_data, u8 private_data_len)
 250 {
 251         if (cm_id_priv->private_data && cm_id_priv->private_data_len)
 252                 kfree(cm_id_priv->private_data);
 253
 254         cm_id_priv->private_data = private_data;
 255         cm_id_priv->private_data_len = private_data_len;
 256 }
 257
 258 static void cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc,
 259                                     struct ib_grh *grh, struct cm_av *av)
 260 {
 261         av->port = port;
 262         av->pkey_index = wc->pkey_index;
 263         ib_init_ah_from_wc(port->cm_dev->device, port->port_num, wc,
 264                            grh, &av->ah_attr);
 265 }
 266
 267 static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av)
 268 {
 269         struct cm_device *cm_dev;
 270         struct cm_port *port = NULL;
 271         unsigned long flags;
 272         int ret;
 273         u8 p;
 274
 275         read_lock_irqsave(&cm.device_lock, flags);
 276         list_for_each_entry(cm_dev, &cm.device_list, list) {
 277                 if (!ib_find_cached_gid(cm_dev->device, &path->sgid,
 278                                         &p, NULL)) {
 279                         port = &cm_dev->port[p-1];
 280                         break;
 281                 }
 282         }
 283         read_unlock_irqrestore(&cm.device_lock, flags);
 284
 285         if (!port)
 286                 return -EINVAL;
 287
 288         ret = ib_find_cached_pkey(cm_dev->device, port->port_num,
 289                                   be16_to_cpu(path->pkey), &av->pkey_index);
 290         if (ret)
 291                 return ret;
 292
 293         av->port = port;
 294         ib_init_ah_from_path(cm_dev->device, port->port_num, path,
 295                              &av->ah_attr);
 296         av->packet_life_time = path->packet_life_time;
 297         return 0;
 298 }
 299
 300 static int cm_alloc_id(struct cm_id_private *cm_id_priv)
 301 {
 302         unsigned long flags;
 303         int ret, id;
 304         static int next_id;
 305
 306         do {
 307                 spin_lock_irqsave(&cm.lock, flags);
 308                 ret = idr_get_new_above(&cm.local_id_table, cm_id_priv,
 309                                         next_id, &id);
 310                 if (!ret)
 311                         next_id = ((unsigned) id + 1) & MAX_ID_MASK;
 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->id.device->node_guid,
 743                                sizeof cm_id_priv->id.device->node_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->id.device->node_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 possible duplicate REQ. */
1301         spin_lock_irqsave(&cm.lock, flags);
1302         timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info);
1303         if (timewait_info) {
1304                 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
1305                                            timewait_info->work.remote_id);
1306                 spin_unlock_irqrestore(&cm.lock, flags);
1307                 if (cur_cm_id_priv) {
1308                         cm_dup_req_handler(work, cur_cm_id_priv);
1309                         cm_deref_id(cur_cm_id_priv);
1310                 }
1311                 return NULL;
1312         }
1313
1314         /* Check for stale connections. */
1315         timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
1316         if (timewait_info) {
1317                 cm_cleanup_timewait(cm_id_priv->timewait_info);
1318                 spin_unlock_irqrestore(&cm.lock, flags);
1319                 cm_issue_rej(work->port, work->mad_recv_wc,
1320                              IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
1321                              NULL, 0);
1322                 return NULL;
1323         }
1324
1325         /* Find matching listen request. */
1326         listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device,
1327                                            req_msg->service_id,
1328                                            req_msg->private_data);
1329         if (!listen_cm_id_priv) {
1330                 cm_cleanup_timewait(cm_id_priv->timewait_info);
1331                 spin_unlock_irqrestore(&cm.lock, flags);
1332                 cm_issue_rej(work->port, work->mad_recv_wc,
1333                              IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ,
1334                              NULL, 0);
1335                 goto out;
1336         }
1337         atomic_inc(&listen_cm_id_priv->refcount);
1338         atomic_inc(&cm_id_priv->refcount);
1339         cm_id_priv->id.state = IB_CM_REQ_RCVD;
1340         atomic_inc(&cm_id_priv->work_count);
1341         spin_unlock_irqrestore(&cm.lock, flags);
1342 out:
1343         return listen_cm_id_priv;
1344 }
1345
1346 static int cm_req_handler(struct cm_work *work)
1347 {
1348         struct ib_cm_id *cm_id;
1349         struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
1350         struct cm_req_msg *req_msg;
1351         int ret;
1352
1353         req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1354
1355         cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL);
1356         if (IS_ERR(cm_id))
1357                 return PTR_ERR(cm_id);
1358
1359         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1360         cm_id_priv->id.remote_id = req_msg->local_comm_id;
1361         cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
1362                                 work->mad_recv_wc->recv_buf.grh,
1363                                 &cm_id_priv->av);
1364         cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1365                                                             id.local_id);
1366         if (IS_ERR(cm_id_priv->timewait_info)) {
1367                 ret = PTR_ERR(cm_id_priv->timewait_info);
1368                 goto destroy;
1369         }
1370         cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id;
1371         cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid;
1372         cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg);
1373
1374         listen_cm_id_priv = cm_match_req(work, cm_id_priv);
1375         if (!listen_cm_id_priv) {
1376                 ret = -EINVAL;
1377                 kfree(cm_id_priv->timewait_info);
1378                 goto destroy;
1379         }
1380
1381         cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
1382         cm_id_priv->id.context = listen_cm_id_priv->id.context;
1383         cm_id_priv->id.service_id = req_msg->service_id;
1384         cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL);
1385
1386         cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]);
1387         ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av);
1388         if (ret) {
1389                 ib_get_cached_gid(work->port->cm_dev->device,
1390                                   work->port->port_num, 0, &work->path[0].sgid);
1391                 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID,
1392                                &work->path[0].sgid, sizeof work->path[0].sgid,
1393                                NULL, 0);
1394                 goto rejected;
1395         }
1396         if (req_msg->alt_local_lid) {
1397                 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av);
1398                 if (ret) {
1399                         ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID,
1400                                        &work->path[0].sgid,
1401                                        sizeof work->path[0].sgid, NULL, 0);
1402                         goto rejected;
1403                 }
1404         }
1405         cm_id_priv->tid = req_msg->hdr.tid;
1406         cm_id_priv->timeout_ms = cm_convert_to_ms(
1407                                         cm_req_get_local_resp_timeout(req_msg));
1408         cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg);
1409         cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg);
1410         cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg);
1411         cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg);
1412         cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg);
1413         cm_id_priv->pkey = req_msg->pkey;
1414         cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg);
1415         cm_id_priv->retry_count = cm_req_get_retry_count(req_msg);
1416         cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1417         cm_id_priv->qp_type = cm_req_get_qp_type(req_msg);
1418
1419         cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
1420         cm_process_work(cm_id_priv, work);
1421         cm_deref_id(listen_cm_id_priv);
1422         return 0;
1423
1424 rejected:
1425         atomic_dec(&cm_id_priv->refcount);
1426         cm_deref_id(listen_cm_id_priv);
1427 destroy:
1428         ib_destroy_cm_id(cm_id);
1429         return ret;
1430 }
1431
1432 static void cm_format_rep(struct cm_rep_msg *rep_msg,
1433                           struct cm_id_private *cm_id_priv,
1434                           struct ib_cm_rep_param *param)
1435 {
1436         cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid);
1437         rep_msg->local_comm_id = cm_id_priv->id.local_id;
1438         rep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1439         cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num));
1440         cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn));
1441         rep_msg->resp_resources = param->responder_resources;
1442         rep_msg->initiator_depth = param->initiator_depth;
1443         cm_rep_set_target_ack_delay(rep_msg, param->target_ack_delay);
1444         cm_rep_set_failover(rep_msg, param->failover_accepted);
1445         cm_rep_set_flow_ctrl(rep_msg, param->flow_control);
1446         cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count);
1447         cm_rep_set_srq(rep_msg, param->srq);
1448         rep_msg->local_ca_guid = cm_id_priv->id.device->node_guid;
1449
1450         if (param->private_data && param->private_data_len)
1451                 memcpy(rep_msg->private_data, param->private_data,
1452                        param->private_data_len);
1453 }
1454
1455 int ib_send_cm_rep(struct ib_cm_id *cm_id,
1456                    struct ib_cm_rep_param *param)
1457 {
1458         struct cm_id_private *cm_id_priv;
1459         struct ib_mad_send_buf *msg;
1460         struct cm_rep_msg *rep_msg;
1461         unsigned long flags;
1462         int ret;
1463
1464         if (param->private_data &&
1465             param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE)
1466                 return -EINVAL;
1467
1468         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1469         spin_lock_irqsave(&cm_id_priv->lock, flags);
1470         if (cm_id->state != IB_CM_REQ_RCVD &&
1471             cm_id->state != IB_CM_MRA_REQ_SENT) {
1472                 ret = -EINVAL;
1473                 goto out;
1474         }
1475
1476         ret = cm_alloc_msg(cm_id_priv, &msg);
1477         if (ret)
1478                 goto out;
1479
1480         rep_msg = (struct cm_rep_msg *) msg->mad;
1481         cm_format_rep(rep_msg, cm_id_priv, param);
1482         msg->timeout_ms = cm_id_priv->timeout_ms;
1483         msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;
1484
1485         ret = ib_post_send_mad(msg, NULL);
1486         if (ret) {
1487                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1488                 cm_free_msg(msg);
1489                 return ret;
1490         }
1491
1492         cm_id->state = IB_CM_REP_SENT;
1493         cm_id_priv->msg = msg;
1494         cm_id_priv->initiator_depth = param->initiator_depth;
1495         cm_id_priv->responder_resources = param->responder_resources;
1496         cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg);
1497         cm_id_priv->local_qpn = cm_rep_get_local_qpn(rep_msg);
1498
1499 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1500         return ret;
1501 }
1502 EXPORT_SYMBOL(ib_send_cm_rep);
1503
1504 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg,
1505                           struct cm_id_private *cm_id_priv,
1506                           const void *private_data,
1507                           u8 private_data_len)
1508 {
1509         cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid);
1510         rtu_msg->local_comm_id = cm_id_priv->id.local_id;
1511         rtu_msg->remote_comm_id = cm_id_priv->id.remote_id;
1512
1513         if (private_data && private_data_len)
1514                 memcpy(rtu_msg->private_data, private_data, private_data_len);
1515 }
1516
1517 int ib_send_cm_rtu(struct ib_cm_id *cm_id,
1518                    const void *private_data,
1519                    u8 private_data_len)
1520 {
1521         struct cm_id_private *cm_id_priv;
1522         struct ib_mad_send_buf *msg;
1523         unsigned long flags;
1524         void *data;
1525         int ret;
1526
1527         if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE)
1528                 return -EINVAL;
1529
1530         data = cm_copy_private_data(private_data, private_data_len);
1531         if (IS_ERR(data))
1532                 return PTR_ERR(data);
1533
1534         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1535         spin_lock_irqsave(&cm_id_priv->lock, flags);
1536         if (cm_id->state != IB_CM_REP_RCVD &&
1537             cm_id->state != IB_CM_MRA_REP_SENT) {
1538                 ret = -EINVAL;
1539                 goto error;
1540         }
1541
1542         ret = cm_alloc_msg(cm_id_priv, &msg);
1543         if (ret)
1544                 goto error;
1545
1546         cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1547                       private_data, private_data_len);
1548
1549         ret = ib_post_send_mad(msg, NULL);
1550         if (ret) {
1551                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1552                 cm_free_msg(msg);
1553                 kfree(data);
1554                 return ret;
1555         }
1556
1557         cm_id->state = IB_CM_ESTABLISHED;
1558         cm_set_private_data(cm_id_priv, data, private_data_len);
1559         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1560         return 0;
1561
1562 error:  spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1563         kfree(data);
1564         return ret;
1565 }
1566 EXPORT_SYMBOL(ib_send_cm_rtu);
1567
1568 static void cm_format_rep_event(struct cm_work *work)
1569 {
1570         struct cm_rep_msg *rep_msg;
1571         struct ib_cm_rep_event_param *param;
1572
1573         rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1574         param = &work->cm_event.param.rep_rcvd;
1575         param->remote_ca_guid = rep_msg->local_ca_guid;
1576         param->remote_qkey = be32_to_cpu(rep_msg->local_qkey);
1577         param->remote_qpn = be32_to_cpu(cm_rep_get_local_qpn(rep_msg));
1578         param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg));
1579         param->responder_resources = rep_msg->initiator_depth;
1580         param->initiator_depth = rep_msg->resp_resources;
1581         param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
1582         param->failover_accepted = cm_rep_get_failover(rep_msg);
1583         param->flow_control = cm_rep_get_flow_ctrl(rep_msg);
1584         param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1585         param->srq = cm_rep_get_srq(rep_msg);
1586         work->cm_event.private_data = &rep_msg->private_data;
1587 }
1588
1589 static void cm_dup_rep_handler(struct cm_work *work)
1590 {
1591         struct cm_id_private *cm_id_priv;
1592         struct cm_rep_msg *rep_msg;
1593         struct ib_mad_send_buf *msg = NULL;
1594         unsigned long flags;
1595         int ret;
1596
1597         rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad;
1598         cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id,
1599                                    rep_msg->local_comm_id);
1600         if (!cm_id_priv)
1601                 return;
1602
1603         ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1604         if (ret)
1605                 goto deref;
1606
1607         spin_lock_irqsave(&cm_id_priv->lock, flags);
1608         if (cm_id_priv->id.state == IB_CM_ESTABLISHED)
1609                 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1610                               cm_id_priv->private_data,
1611                               cm_id_priv->private_data_len);
1612         else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT)
1613                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1614                               CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout,
1615                               cm_id_priv->private_data,
1616                               cm_id_priv->private_data_len);
1617         else
1618                 goto unlock;
1619         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1620
1621         ret = ib_post_send_mad(msg, NULL);
1622         if (ret)
1623                 goto free;
1624         goto deref;
1625
1626 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1627 free:   cm_free_msg(msg);
1628 deref:  cm_deref_id(cm_id_priv);
1629 }
1630
1631 static int cm_rep_handler(struct cm_work *work)
1632 {
1633         struct cm_id_private *cm_id_priv;
1634         struct cm_rep_msg *rep_msg;
1635         unsigned long flags;
1636         int ret;
1637
1638         rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1639         cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0);
1640         if (!cm_id_priv) {
1641                 cm_dup_rep_handler(work);
1642                 return -EINVAL;
1643         }
1644
1645         cm_format_rep_event(work);
1646
1647         spin_lock_irqsave(&cm_id_priv->lock, flags);
1648         switch (cm_id_priv->id.state) {
1649         case IB_CM_REQ_SENT:
1650         case IB_CM_MRA_REQ_RCVD:
1651                 break;
1652         default:
1653                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1654                 ret = -EINVAL;
1655                 goto error;
1656         }
1657
1658         cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id;
1659         cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid;
1660         cm_id_priv->timewait_info->remote_qpn = cm_rep_get_local_qpn(rep_msg);
1661
1662         spin_lock(&cm.lock);
1663         /* Check for duplicate REP. */
1664         if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
1665                 spin_unlock(&cm.lock);
1666                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1667                 ret = -EINVAL;
1668                 goto error;
1669         }
1670         /* Check for a stale connection. */
1671         if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) {
1672                 rb_erase(&cm_id_priv->timewait_info->remote_id_node,
1673                          &cm.remote_id_table);
1674                 cm_id_priv->timewait_info->inserted_remote_id = 0;
1675                 spin_unlock(&cm.lock);
1676                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1677                 cm_issue_rej(work->port, work->mad_recv_wc,
1678                              IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP,
1679                              NULL, 0);
1680                 ret = -EINVAL;
1681                 goto error;
1682         }
1683         spin_unlock(&cm.lock);
1684
1685         cm_id_priv->id.state = IB_CM_REP_RCVD;
1686         cm_id_priv->id.remote_id = rep_msg->local_comm_id;
1687         cm_id_priv->remote_qpn = cm_rep_get_local_qpn(rep_msg);
1688         cm_id_priv->initiator_depth = rep_msg->resp_resources;
1689         cm_id_priv->responder_resources = rep_msg->initiator_depth;
1690         cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg);
1691         cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1692
1693         /* todo: handle peer_to_peer */
1694
1695         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1696         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1697         if (!ret)
1698                 list_add_tail(&work->list, &cm_id_priv->work_list);
1699         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1700
1701         if (ret)
1702                 cm_process_work(cm_id_priv, work);
1703         else
1704                 cm_deref_id(cm_id_priv);
1705         return 0;
1706
1707 error:
1708         cm_deref_id(cm_id_priv);
1709         return ret;
1710 }
1711
1712 static int cm_establish_handler(struct cm_work *work)
1713 {
1714         struct cm_id_private *cm_id_priv;
1715         unsigned long flags;
1716         int ret;
1717
1718         /* See comment in cm_establish about lookup. */
1719         cm_id_priv = cm_acquire_id(work->local_id, work->remote_id);
1720         if (!cm_id_priv)
1721                 return -EINVAL;
1722
1723         spin_lock_irqsave(&cm_id_priv->lock, flags);
1724         if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
1725                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1726                 goto out;
1727         }
1728
1729         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1730         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1731         if (!ret)
1732                 list_add_tail(&work->list, &cm_id_priv->work_list);
1733         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1734
1735         if (ret)
1736                 cm_process_work(cm_id_priv, work);
1737         else
1738                 cm_deref_id(cm_id_priv);
1739         return 0;
1740 out:
1741         cm_deref_id(cm_id_priv);
1742         return -EINVAL;
1743 }
1744
1745 static int cm_rtu_handler(struct cm_work *work)
1746 {
1747         struct cm_id_private *cm_id_priv;
1748         struct cm_rtu_msg *rtu_msg;
1749         unsigned long flags;
1750         int ret;
1751
1752         rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad;
1753         cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id,
1754                                    rtu_msg->local_comm_id);
1755         if (!cm_id_priv)
1756                 return -EINVAL;
1757
1758         work->cm_event.private_data = &rtu_msg->private_data;
1759
1760         spin_lock_irqsave(&cm_id_priv->lock, flags);
1761         if (cm_id_priv->id.state != IB_CM_REP_SENT &&
1762             cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
1763                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1764                 goto out;
1765         }
1766         cm_id_priv->id.state = IB_CM_ESTABLISHED;
1767
1768         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1769         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1770         if (!ret)
1771                 list_add_tail(&work->list, &cm_id_priv->work_list);
1772         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1773
1774         if (ret)
1775                 cm_process_work(cm_id_priv, work);
1776         else
1777                 cm_deref_id(cm_id_priv);
1778         return 0;
1779 out:
1780         cm_deref_id(cm_id_priv);
1781         return -EINVAL;
1782 }
1783
1784 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg,
1785                           struct cm_id_private *cm_id_priv,
1786                           const void *private_data,
1787                           u8 private_data_len)
1788 {
1789         cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID,
1790                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ));
1791         dreq_msg->local_comm_id = cm_id_priv->id.local_id;
1792         dreq_msg->remote_comm_id = cm_id_priv->id.remote_id;
1793         cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn);
1794
1795         if (private_data && private_data_len)
1796                 memcpy(dreq_msg->private_data, private_data, private_data_len);
1797 }
1798
1799 int ib_send_cm_dreq(struct ib_cm_id *cm_id,
1800                     const void *private_data,
1801                     u8 private_data_len)
1802 {
1803         struct cm_id_private *cm_id_priv;
1804         struct ib_mad_send_buf *msg;
1805         unsigned long flags;
1806         int ret;
1807
1808         if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE)
1809                 return -EINVAL;
1810
1811         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1812         spin_lock_irqsave(&cm_id_priv->lock, flags);
1813         if (cm_id->state != IB_CM_ESTABLISHED) {
1814                 ret = -EINVAL;
1815                 goto out;
1816         }
1817
1818         ret = cm_alloc_msg(cm_id_priv, &msg);
1819         if (ret) {
1820                 cm_enter_timewait(cm_id_priv);
1821                 goto out;
1822         }
1823
1824         cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv,
1825                        private_data, private_data_len);
1826         msg->timeout_ms = cm_id_priv->timeout_ms;
1827         msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
1828
1829         ret = ib_post_send_mad(msg, NULL);
1830         if (ret) {
1831                 cm_enter_timewait(cm_id_priv);
1832                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1833                 cm_free_msg(msg);
1834                 return ret;
1835         }
1836
1837         cm_id->state = IB_CM_DREQ_SENT;
1838         cm_id_priv->msg = msg;
1839 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1840         return ret;
1841 }
1842 EXPORT_SYMBOL(ib_send_cm_dreq);
1843
1844 static void cm_format_drep(struct cm_drep_msg *drep_msg,
1845                           struct cm_id_private *cm_id_priv,
1846                           const void *private_data,
1847                           u8 private_data_len)
1848 {
1849         cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid);
1850         drep_msg->local_comm_id = cm_id_priv->id.local_id;
1851         drep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1852
1853         if (private_data && private_data_len)
1854                 memcpy(drep_msg->private_data, private_data, private_data_len);
1855 }
1856
1857 int ib_send_cm_drep(struct ib_cm_id *cm_id,
1858                     const void *private_data,
1859                     u8 private_data_len)
1860 {
1861         struct cm_id_private *cm_id_priv;
1862         struct ib_mad_send_buf *msg;
1863         unsigned long flags;
1864         void *data;
1865         int ret;
1866
1867         if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
1868                 return -EINVAL;
1869
1870         data = cm_copy_private_data(private_data, private_data_len);
1871         if (IS_ERR(data))
1872                 return PTR_ERR(data);
1873
1874         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1875         spin_lock_irqsave(&cm_id_priv->lock, flags);
1876         if (cm_id->state != IB_CM_DREQ_RCVD) {
1877                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1878                 kfree(data);
1879                 return -EINVAL;
1880         }
1881
1882         cm_set_private_data(cm_id_priv, data, private_data_len);
1883         cm_enter_timewait(cm_id_priv);
1884
1885         ret = cm_alloc_msg(cm_id_priv, &msg);
1886         if (ret)
1887                 goto out;
1888
1889         cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
1890                        private_data, private_data_len);
1891
1892         ret = ib_post_send_mad(msg, NULL);
1893         if (ret) {
1894                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1895                 cm_free_msg(msg);
1896                 return ret;
1897         }
1898
1899 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1900         return ret;
1901 }
1902 EXPORT_SYMBOL(ib_send_cm_drep);
1903
1904 static int cm_issue_drep(struct cm_port *port,
1905                          struct ib_mad_recv_wc *mad_recv_wc)
1906 {
1907         struct ib_mad_send_buf *msg = NULL;
1908         struct cm_dreq_msg *dreq_msg;
1909         struct cm_drep_msg *drep_msg;
1910         int ret;
1911
1912         ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
1913         if (ret)
1914                 return ret;
1915
1916         dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad;
1917         drep_msg = (struct cm_drep_msg *) msg->mad;
1918
1919         cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid);
1920         drep_msg->remote_comm_id = dreq_msg->local_comm_id;
1921         drep_msg->local_comm_id = dreq_msg->remote_comm_id;
1922
1923         ret = ib_post_send_mad(msg, NULL);
1924         if (ret)
1925                 cm_free_msg(msg);
1926
1927         return ret;
1928 }
1929
1930 static int cm_dreq_handler(struct cm_work *work)
1931 {
1932         struct cm_id_private *cm_id_priv;
1933         struct cm_dreq_msg *dreq_msg;
1934         struct ib_mad_send_buf *msg = NULL;
1935         unsigned long flags;
1936         int ret;
1937
1938         dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
1939         cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id,
1940                                    dreq_msg->local_comm_id);
1941         if (!cm_id_priv) {
1942                 cm_issue_drep(work->port, work->mad_recv_wc);
1943                 return -EINVAL;
1944         }
1945
1946         work->cm_event.private_data = &dreq_msg->private_data;
1947
1948         spin_lock_irqsave(&cm_id_priv->lock, flags);
1949         if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg))
1950                 goto unlock;
1951
1952         switch (cm_id_priv->id.state) {
1953         case IB_CM_REP_SENT:
1954         case IB_CM_DREQ_SENT:
1955                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1956                 break;
1957         case IB_CM_ESTABLISHED:
1958         case IB_CM_MRA_REP_RCVD:
1959                 break;
1960         case IB_CM_TIMEWAIT:
1961                 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
1962                         goto unlock;
1963
1964                 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
1965                                cm_id_priv->private_data,
1966                                cm_id_priv->private_data_len);
1967                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1968
1969                 if (ib_post_send_mad(msg, NULL))
1970                         cm_free_msg(msg);
1971                 goto deref;
1972         default:
1973                 goto unlock;
1974         }
1975         cm_id_priv->id.state = IB_CM_DREQ_RCVD;
1976         cm_id_priv->tid = dreq_msg->hdr.tid;
1977         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1978         if (!ret)
1979                 list_add_tail(&work->list, &cm_id_priv->work_list);
1980         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1981
1982         if (ret)
1983                 cm_process_work(cm_id_priv, work);
1984         else
1985                 cm_deref_id(cm_id_priv);
1986         return 0;
1987
1988 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1989 deref:  cm_deref_id(cm_id_priv);
1990         return -EINVAL;
1991 }
1992
1993 static int cm_drep_handler(struct cm_work *work)
1994 {
1995         struct cm_id_private *cm_id_priv;
1996         struct cm_drep_msg *drep_msg;
1997         unsigned long flags;
1998         int ret;
1999
2000         drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
2001         cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id,
2002                                    drep_msg->local_comm_id);
2003         if (!cm_id_priv)
2004                 return -EINVAL;
2005
2006         work->cm_event.private_data = &drep_msg->private_data;
2007
2008         spin_lock_irqsave(&cm_id_priv->lock, flags);
2009         if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
2010             cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
2011                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2012                 goto out;
2013         }
2014         cm_enter_timewait(cm_id_priv);
2015
2016         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2017         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2018         if (!ret)
2019                 list_add_tail(&work->list, &cm_id_priv->work_list);
2020         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2021
2022         if (ret)
2023                 cm_process_work(cm_id_priv, work);
2024         else
2025                 cm_deref_id(cm_id_priv);
2026         return 0;
2027 out:
2028         cm_deref_id(cm_id_priv);
2029         return -EINVAL;
2030 }
2031
2032 int ib_send_cm_rej(struct ib_cm_id *cm_id,
2033                    enum ib_cm_rej_reason reason,
2034                    void *ari,
2035                    u8 ari_length,
2036                    const void *private_data,
2037                    u8 private_data_len)
2038 {
2039         struct cm_id_private *cm_id_priv;
2040         struct ib_mad_send_buf *msg;
2041         unsigned long flags;
2042         int ret;
2043
2044         if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
2045             (ari && ari_length > IB_CM_REJ_ARI_LENGTH))
2046                 return -EINVAL;
2047
2048         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2049
2050         spin_lock_irqsave(&cm_id_priv->lock, flags);
2051         switch (cm_id->state) {
2052         case IB_CM_REQ_SENT:
2053         case IB_CM_MRA_REQ_RCVD:
2054         case IB_CM_REQ_RCVD:
2055         case IB_CM_MRA_REQ_SENT:
2056         case IB_CM_REP_RCVD:
2057         case IB_CM_MRA_REP_SENT:
2058                 ret = cm_alloc_msg(cm_id_priv, &msg);
2059                 if (!ret)
2060                         cm_format_rej((struct cm_rej_msg *) msg->mad,
2061                                       cm_id_priv, reason, ari, ari_length,
2062                                       private_data, private_data_len);
2063
2064                 cm_reset_to_idle(cm_id_priv);
2065                 break;
2066         case IB_CM_REP_SENT:
2067         case IB_CM_MRA_REP_RCVD:
2068                 ret = cm_alloc_msg(cm_id_priv, &msg);
2069                 if (!ret)
2070                         cm_format_rej((struct cm_rej_msg *) msg->mad,
2071                                       cm_id_priv, reason, ari, ari_length,
2072                                       private_data, private_data_len);
2073
2074                 cm_enter_timewait(cm_id_priv);
2075                 break;
2076         default:
2077                 ret = -EINVAL;
2078                 goto out;
2079         }
2080
2081         if (ret)
2082                 goto out;
2083
2084         ret = ib_post_send_mad(msg, NULL);
2085         if (ret)
2086                 cm_free_msg(msg);
2087
2088 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2089         return ret;
2090 }
2091 EXPORT_SYMBOL(ib_send_cm_rej);
2092
2093 static void cm_format_rej_event(struct cm_work *work)
2094 {
2095         struct cm_rej_msg *rej_msg;
2096         struct ib_cm_rej_event_param *param;
2097
2098         rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2099         param = &work->cm_event.param.rej_rcvd;
2100         param->ari = rej_msg->ari;
2101         param->ari_length = cm_rej_get_reject_info_len(rej_msg);
2102         param->reason = __be16_to_cpu(rej_msg->reason);
2103         work->cm_event.private_data = &rej_msg->private_data;
2104 }
2105
2106 static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
2107 {
2108         struct cm_timewait_info *timewait_info;
2109         struct cm_id_private *cm_id_priv;
2110         unsigned long flags;
2111         __be32 remote_id;
2112
2113         remote_id = rej_msg->local_comm_id;
2114
2115         if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) {
2116                 spin_lock_irqsave(&cm.lock, flags);
2117                 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari),
2118                                                   remote_id);
2119                 if (!timewait_info) {
2120                         spin_unlock_irqrestore(&cm.lock, flags);
2121                         return NULL;
2122                 }
2123                 cm_id_priv = idr_find(&cm.local_id_table, (__force int)
2124                                       (timewait_info->work.local_id ^
2125                                        cm.random_id_operand));
2126                 if (cm_id_priv) {
2127                         if (cm_id_priv->id.remote_id == remote_id)
2128                                 atomic_inc(&cm_id_priv->refcount);
2129                         else
2130                                 cm_id_priv = NULL;
2131                 }
2132                 spin_unlock_irqrestore(&cm.lock, flags);
2133         } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ)
2134                 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0);
2135         else
2136                 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id);
2137
2138         return cm_id_priv;
2139 }
2140
2141 static int cm_rej_handler(struct cm_work *work)
2142 {
2143         struct cm_id_private *cm_id_priv;
2144         struct cm_rej_msg *rej_msg;
2145         unsigned long flags;
2146         int ret;
2147
2148         rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2149         cm_id_priv = cm_acquire_rejected_id(rej_msg);
2150         if (!cm_id_priv)
2151                 return -EINVAL;
2152
2153         cm_format_rej_event(work);
2154
2155         spin_lock_irqsave(&cm_id_priv->lock, flags);
2156         switch (cm_id_priv->id.state) {
2157         case IB_CM_REQ_SENT:
2158         case IB_CM_MRA_REQ_RCVD:
2159         case IB_CM_REP_SENT:
2160         case IB_CM_MRA_REP_RCVD:
2161                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2162                 /* fall through */
2163         case IB_CM_REQ_RCVD:
2164         case IB_CM_MRA_REQ_SENT:
2165                 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN)
2166                         cm_enter_timewait(cm_id_priv);
2167                 else
2168                         cm_reset_to_idle(cm_id_priv);
2169                 break;
2170         case IB_CM_DREQ_SENT:
2171                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2172                 /* fall through */
2173         case IB_CM_REP_RCVD:
2174         case IB_CM_MRA_REP_SENT:
2175         case IB_CM_ESTABLISHED:
2176                 cm_enter_timewait(cm_id_priv);
2177                 break;
2178         default:
2179                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2180                 ret = -EINVAL;
2181                 goto out;
2182         }
2183
2184         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2185         if (!ret)
2186                 list_add_tail(&work->list, &cm_id_priv->work_list);
2187         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2188
2189         if (ret)
2190                 cm_process_work(cm_id_priv, work);
2191         else
2192                 cm_deref_id(cm_id_priv);
2193         return 0;
2194 out:
2195         cm_deref_id(cm_id_priv);
2196         return -EINVAL;
2197 }
2198
2199 int ib_send_cm_mra(struct ib_cm_id *cm_id,
2200                    u8 service_timeout,
2201                    const void *private_data,
2202                    u8 private_data_len)
2203 {
2204         struct cm_id_private *cm_id_priv;
2205         struct ib_mad_send_buf *msg;
2206         void *data;
2207         unsigned long flags;
2208         int ret;
2209
2210         if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE)
2211                 return -EINVAL;
2212
2213         data = cm_copy_private_data(private_data, private_data_len);
2214         if (IS_ERR(data))
2215                 return PTR_ERR(data);
2216
2217         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2218
2219         spin_lock_irqsave(&cm_id_priv->lock, flags);
2220         switch(cm_id_priv->id.state) {
2221         case IB_CM_REQ_RCVD:
2222                 ret = cm_alloc_msg(cm_id_priv, &msg);
2223                 if (ret)
2224                         goto error1;
2225
2226                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2227                               CM_MSG_RESPONSE_REQ, service_timeout,
2228                               private_data, private_data_len);
2229                 ret = ib_post_send_mad(msg, NULL);
2230                 if (ret)
2231                         goto error2;
2232                 cm_id->state = IB_CM_MRA_REQ_SENT;
2233                 break;
2234         case IB_CM_REP_RCVD:
2235                 ret = cm_alloc_msg(cm_id_priv, &msg);
2236                 if (ret)
2237                         goto error1;
2238
2239                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2240                               CM_MSG_RESPONSE_REP, service_timeout,
2241                               private_data, private_data_len);
2242                 ret = ib_post_send_mad(msg, NULL);
2243                 if (ret)
2244                         goto error2;
2245                 cm_id->state = IB_CM_MRA_REP_SENT;
2246                 break;
2247         case IB_CM_ESTABLISHED:
2248                 ret = cm_alloc_msg(cm_id_priv, &msg);
2249                 if (ret)
2250                         goto error1;
2251
2252                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2253                               CM_MSG_RESPONSE_OTHER, service_timeout,
2254                               private_data, private_data_len);
2255                 ret = ib_post_send_mad(msg, NULL);
2256                 if (ret)
2257                         goto error2;
2258                 cm_id->lap_state = IB_CM_MRA_LAP_SENT;
2259                 break;
2260         default:
2261                 ret = -EINVAL;
2262                 goto error1;
2263         }
2264         cm_id_priv->service_timeout = service_timeout;
2265         cm_set_private_data(cm_id_priv, data, private_data_len);
2266         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2267         return 0;
2268
2269 error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2270         kfree(data);
2271         return ret;
2272
2273 error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2274         kfree(data);
2275         cm_free_msg(msg);
2276         return ret;
2277 }
2278 EXPORT_SYMBOL(ib_send_cm_mra);
2279
2280 static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
2281 {
2282         switch (cm_mra_get_msg_mraed(mra_msg)) {
2283         case CM_MSG_RESPONSE_REQ:
2284                 return cm_acquire_id(mra_msg->remote_comm_id, 0);
2285         case CM_MSG_RESPONSE_REP:
2286         case CM_MSG_RESPONSE_OTHER:
2287                 return cm_acquire_id(mra_msg->remote_comm_id,
2288                                      mra_msg->local_comm_id);
2289         default:
2290                 return NULL;
2291         }
2292 }
2293
2294 static int cm_mra_handler(struct cm_work *work)
2295 {
2296         struct cm_id_private *cm_id_priv;
2297         struct cm_mra_msg *mra_msg;
2298         unsigned long flags;
2299         int timeout, ret;
2300
2301         mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
2302         cm_id_priv = cm_acquire_mraed_id(mra_msg);
2303         if (!cm_id_priv)
2304                 return -EINVAL;
2305
2306         work->cm_event.private_data = &mra_msg->private_data;
2307         work->cm_event.param.mra_rcvd.service_timeout =
2308                                         cm_mra_get_service_timeout(mra_msg);
2309         timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) +
2310                   cm_convert_to_ms(cm_id_priv->av.packet_life_time);
2311
2312         spin_lock_irqsave(&cm_id_priv->lock, flags);
2313         switch (cm_id_priv->id.state) {
2314         case IB_CM_REQ_SENT:
2315                 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ ||
2316                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
2317                                   cm_id_priv->msg, timeout))
2318                         goto out;
2319                 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
2320                 break;
2321         case IB_CM_REP_SENT:
2322                 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP ||
2323                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
2324                                   cm_id_priv->msg, timeout))
2325                         goto out;
2326                 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
2327                 break;
2328         case IB_CM_ESTABLISHED:
2329                 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER ||
2330                     cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
2331                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
2332                                   cm_id_priv->msg, timeout))
2333                         goto out;
2334                 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
2335                 break;
2336         default:
2337                 goto out;
2338         }
2339
2340         cm_id_priv->msg->context[1] = (void *) (unsigned long)
2341                                       cm_id_priv->id.state;
2342         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2343         if (!ret)
2344                 list_add_tail(&work->list, &cm_id_priv->work_list);
2345         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2346
2347         if (ret)
2348                 cm_process_work(cm_id_priv, work);
2349         else
2350                 cm_deref_id(cm_id_priv);
2351         return 0;
2352 out:
2353         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2354         cm_deref_id(cm_id_priv);
2355         return -EINVAL;
2356 }
2357
2358 static void cm_format_lap(struct cm_lap_msg *lap_msg,
2359                           struct cm_id_private *cm_id_priv,
2360                           struct ib_sa_path_rec *alternate_path,
2361                           const void *private_data,
2362                           u8 private_data_len)
2363 {
2364         cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID,
2365                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP));
2366         lap_msg->local_comm_id = cm_id_priv->id.local_id;
2367         lap_msg->remote_comm_id = cm_id_priv->id.remote_id;
2368         cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn);
2369         /* todo: need remote CM response timeout */
2370         cm_lap_set_remote_resp_timeout(lap_msg, 0x1F);
2371         lap_msg->alt_local_lid = alternate_path->slid;
2372         lap_msg->alt_remote_lid = alternate_path->dlid;
2373         lap_msg->alt_local_gid = alternate_path->sgid;
2374         lap_msg->alt_remote_gid = alternate_path->dgid;
2375         cm_lap_set_flow_label(lap_msg, alternate_path->flow_label);
2376         cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class);
2377         lap_msg->alt_hop_limit = alternate_path->hop_limit;
2378         cm_lap_set_packet_rate(lap_msg, alternate_path->rate);
2379         cm_lap_set_sl(lap_msg, alternate_path->sl);
2380         cm_lap_set_subnet_local(lap_msg, 1); /* local only... */
2381         cm_lap_set_local_ack_timeout(lap_msg,
2382                 min(31, alternate_path->packet_life_time + 1));
2383
2384         if (private_data && private_data_len)
2385                 memcpy(lap_msg->private_data, private_data, private_data_len);
2386 }
2387
2388 int ib_send_cm_lap(struct ib_cm_id *cm_id,
2389                    struct ib_sa_path_rec *alternate_path,
2390                    const void *private_data,
2391                    u8 private_data_len)
2392 {
2393         struct cm_id_private *cm_id_priv;
2394         struct ib_mad_send_buf *msg;
2395         unsigned long flags;
2396         int ret;
2397
2398         if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE)
2399                 return -EINVAL;
2400
2401         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2402         spin_lock_irqsave(&cm_id_priv->lock, flags);
2403         if (cm_id->state != IB_CM_ESTABLISHED ||
2404             (cm_id->lap_state != IB_CM_LAP_UNINIT &&
2405              cm_id->lap_state != IB_CM_LAP_IDLE)) {
2406                 ret = -EINVAL;
2407                 goto out;
2408         }
2409
2410         ret = cm_init_av_by_path(alternate_path, &cm_id_priv->alt_av);
2411         if (ret)
2412                 goto out;
2413
2414         ret = cm_alloc_msg(cm_id_priv, &msg);
2415         if (ret)
2416                 goto out;
2417
2418         cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv,
2419                       alternate_path, private_data, private_data_len);
2420         msg->timeout_ms = cm_id_priv->timeout_ms;
2421         msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED;
2422
2423         ret = ib_post_send_mad(msg, NULL);
2424         if (ret) {
2425                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2426                 cm_free_msg(msg);
2427                 return ret;
2428         }
2429
2430         cm_id->lap_state = IB_CM_LAP_SENT;
2431         cm_id_priv->msg = msg;
2432
2433 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2434         return ret;
2435 }
2436 EXPORT_SYMBOL(ib_send_cm_lap);
2437
2438 static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv,
2439                                     struct ib_sa_path_rec *path,
2440                                     struct cm_lap_msg *lap_msg)
2441 {
2442         memset(path, 0, sizeof *path);
2443         path->dgid = lap_msg->alt_local_gid;
2444         path->sgid = lap_msg->alt_remote_gid;
2445         path->dlid = lap_msg->alt_local_lid;
2446         path->slid = lap_msg->alt_remote_lid;
2447         path->flow_label = cm_lap_get_flow_label(lap_msg);
2448         path->hop_limit = lap_msg->alt_hop_limit;
2449         path->traffic_class = cm_lap_get_traffic_class(lap_msg);
2450         path->reversible = 1;
2451         path->pkey = cm_id_priv->pkey;
2452         path->sl = cm_lap_get_sl(lap_msg);
2453         path->mtu_selector = IB_SA_EQ;
2454         path->mtu = cm_id_priv->path_mtu;
2455         path->rate_selector = IB_SA_EQ;
2456         path->rate = cm_lap_get_packet_rate(lap_msg);
2457         path->packet_life_time_selector = IB_SA_EQ;
2458         path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg);
2459         path->packet_life_time -= (path->packet_life_time > 0);
2460 }
2461
2462 static int cm_lap_handler(struct cm_work *work)
2463 {
2464         struct cm_id_private *cm_id_priv;
2465         struct cm_lap_msg *lap_msg;
2466         struct ib_cm_lap_event_param *param;
2467         struct ib_mad_send_buf *msg = NULL;
2468         unsigned long flags;
2469         int ret;
2470
2471         /* todo: verify LAP request and send reject APR if invalid. */
2472         lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
2473         cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id,
2474                                    lap_msg->local_comm_id);
2475         if (!cm_id_priv)
2476                 return -EINVAL;
2477
2478         param = &work->cm_event.param.lap_rcvd;
2479         param->alternate_path = &work->path[0];
2480         cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg);
2481         work->cm_event.private_data = &lap_msg->private_data;
2482
2483         spin_lock_irqsave(&cm_id_priv->lock, flags);
2484         if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
2485                 goto unlock;
2486
2487         switch (cm_id_priv->id.lap_state) {
2488         case IB_CM_LAP_UNINIT:
2489         case IB_CM_LAP_IDLE:
2490                 break;
2491         case IB_CM_MRA_LAP_SENT:
2492                 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2493                         goto unlock;
2494
2495                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2496                               CM_MSG_RESPONSE_OTHER,
2497                               cm_id_priv->service_timeout,
2498                               cm_id_priv->private_data,
2499                               cm_id_priv->private_data_len);
2500                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2501
2502                 if (ib_post_send_mad(msg, NULL))
2503                         cm_free_msg(msg);
2504                 goto deref;
2505         default:
2506                 goto unlock;
2507         }
2508
2509         cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
2510         cm_id_priv->tid = lap_msg->hdr.tid;
2511         cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2512                                 work->mad_recv_wc->recv_buf.grh,
2513                                 &cm_id_priv->av);
2514         cm_init_av_by_path(param->alternate_path, &cm_id_priv->alt_av);
2515         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2516         if (!ret)
2517                 list_add_tail(&work->list, &cm_id_priv->work_list);
2518         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2519
2520         if (ret)
2521                 cm_process_work(cm_id_priv, work);
2522         else
2523                 cm_deref_id(cm_id_priv);
2524         return 0;
2525
2526 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2527 deref:  cm_deref_id(cm_id_priv);
2528         return -EINVAL;
2529 }
2530
2531 static void cm_format_apr(struct cm_apr_msg *apr_msg,
2532                           struct cm_id_private *cm_id_priv,
2533                           enum ib_cm_apr_status status,
2534                           void *info,
2535                           u8 info_length,
2536                           const void *private_data,
2537                           u8 private_data_len)
2538 {
2539         cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid);
2540         apr_msg->local_comm_id = cm_id_priv->id.local_id;
2541         apr_msg->remote_comm_id = cm_id_priv->id.remote_id;
2542         apr_msg->ap_status = (u8) status;
2543
2544         if (info && info_length) {
2545                 apr_msg->info_length = info_length;
2546                 memcpy(apr_msg->info, info, info_length);
2547         }
2548
2549         if (private_data && private_data_len)
2550                 memcpy(apr_msg->private_data, private_data, private_data_len);
2551 }
2552
2553 int ib_send_cm_apr(struct ib_cm_id *cm_id,
2554                    enum ib_cm_apr_status status,
2555                    void *info,
2556                    u8 info_length,
2557                    const void *private_data,
2558                    u8 private_data_len)
2559 {
2560         struct cm_id_private *cm_id_priv;
2561         struct ib_mad_send_buf *msg;
2562         unsigned long flags;
2563         int ret;
2564
2565         if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) ||
2566             (info && info_length > IB_CM_APR_INFO_LENGTH))
2567                 return -EINVAL;
2568
2569         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2570         spin_lock_irqsave(&cm_id_priv->lock, flags);
2571         if (cm_id->state != IB_CM_ESTABLISHED ||
2572             (cm_id->lap_state != IB_CM_LAP_RCVD &&
2573              cm_id->lap_state != IB_CM_MRA_LAP_SENT)) {
2574                 ret = -EINVAL;
2575                 goto out;
2576         }
2577
2578         ret = cm_alloc_msg(cm_id_priv, &msg);
2579         if (ret)
2580                 goto out;
2581
2582         cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status,
2583                       info, info_length, private_data, private_data_len);
2584         ret = ib_post_send_mad(msg, NULL);
2585         if (ret) {
2586                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2587                 cm_free_msg(msg);
2588                 return ret;
2589         }
2590
2591         cm_id->lap_state = IB_CM_LAP_IDLE;
2592 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2593         return ret;
2594 }
2595 EXPORT_SYMBOL(ib_send_cm_apr);
2596
2597 static int cm_apr_handler(struct cm_work *work)
2598 {
2599         struct cm_id_private *cm_id_priv;
2600         struct cm_apr_msg *apr_msg;
2601         unsigned long flags;
2602         int ret;
2603
2604         apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
2605         cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id,
2606                                    apr_msg->local_comm_id);
2607         if (!cm_id_priv)
2608                 return -EINVAL; /* Unmatched reply. */
2609
2610         work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status;
2611         work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info;
2612         work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length;
2613         work->cm_event.private_data = &apr_msg->private_data;
2614
2615         spin_lock_irqsave(&cm_id_priv->lock, flags);
2616         if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
2617             (cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
2618              cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
2619                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2620                 goto out;
2621         }
2622         cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
2623         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2624         cm_id_priv->msg = NULL;
2625
2626         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2627         if (!ret)
2628                 list_add_tail(&work->list, &cm_id_priv->work_list);
2629         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2630
2631         if (ret)
2632                 cm_process_work(cm_id_priv, work);
2633         else
2634                 cm_deref_id(cm_id_priv);
2635         return 0;
2636 out:
2637         cm_deref_id(cm_id_priv);
2638         return -EINVAL;
2639 }
2640
2641 static int cm_timewait_handler(struct cm_work *work)
2642 {
2643         struct cm_timewait_info *timewait_info;
2644         struct cm_id_private *cm_id_priv;
2645         int ret;
2646
2647         timewait_info = (struct cm_timewait_info *)work;
2648         spin_lock_irq(&cm.lock);
2649         list_del(&timewait_info->list);
2650         spin_unlock_irq(&cm.lock);
2651
2652         cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
2653                                    timewait_info->work.remote_id);
2654         if (!cm_id_priv)
2655                 return -EINVAL;
2656
2657         spin_lock_irq(&cm_id_priv->lock);
2658         if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
2659             cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
2660                 spin_unlock_irq(&cm_id_priv->lock);
2661                 goto out;
2662         }
2663         cm_id_priv->id.state = IB_CM_IDLE;
2664         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2665         if (!ret)
2666                 list_add_tail(&work->list, &cm_id_priv->work_list);
2667         spin_unlock_irq(&cm_id_priv->lock);
2668
2669         if (ret)
2670                 cm_process_work(cm_id_priv, work);
2671         else
2672                 cm_deref_id(cm_id_priv);
2673         return 0;
2674 out:
2675         cm_deref_id(cm_id_priv);
2676         return -EINVAL;
2677 }
2678
2679 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
2680                                struct cm_id_private *cm_id_priv,
2681                                struct ib_cm_sidr_req_param *param)
2682 {
2683         cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
2684                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR));
2685         sidr_req_msg->request_id = cm_id_priv->id.local_id;
2686         sidr_req_msg->pkey = cpu_to_be16(param->path->pkey);
2687         sidr_req_msg->service_id = param->service_id;
2688
2689         if (param->private_data && param->private_data_len)
2690                 memcpy(sidr_req_msg->private_data, param->private_data,
2691                        param->private_data_len);
2692 }
2693
2694 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
2695                         struct ib_cm_sidr_req_param *param)
2696 {
2697         struct cm_id_private *cm_id_priv;
2698         struct ib_mad_send_buf *msg;
2699         unsigned long flags;
2700         int ret;
2701
2702         if (!param->path || (param->private_data &&
2703              param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
2704                 return -EINVAL;
2705
2706         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2707         ret = cm_init_av_by_path(param->path, &cm_id_priv->av);
2708         if (ret)
2709                 goto out;
2710
2711         cm_id->service_id = param->service_id;
2712         cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
2713         cm_id_priv->timeout_ms = param->timeout_ms;
2714         cm_id_priv->max_cm_retries = param->max_cm_retries;
2715         ret = cm_alloc_msg(cm_id_priv, &msg);
2716         if (ret)
2717                 goto out;
2718
2719         cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv,
2720                            param);
2721         msg->timeout_ms = cm_id_priv->timeout_ms;
2722         msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT;
2723
2724         spin_lock_irqsave(&cm_id_priv->lock, flags);
2725         if (cm_id->state == IB_CM_IDLE)
2726                 ret = ib_post_send_mad(msg, NULL);
2727         else
2728                 ret = -EINVAL;
2729
2730         if (ret) {
2731                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2732                 cm_free_msg(msg);
2733                 goto out;
2734         }
2735         cm_id->state = IB_CM_SIDR_REQ_SENT;
2736         cm_id_priv->msg = msg;
2737         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2738 out:
2739         return ret;
2740 }
2741 EXPORT_SYMBOL(ib_send_cm_sidr_req);
2742
2743 static void cm_format_sidr_req_event(struct cm_work *work,
2744                                      struct ib_cm_id *listen_id)
2745 {
2746         struct cm_sidr_req_msg *sidr_req_msg;
2747         struct ib_cm_sidr_req_event_param *param;
2748
2749         sidr_req_msg = (struct cm_sidr_req_msg *)
2750                                 work->mad_recv_wc->recv_buf.mad;
2751         param = &work->cm_event.param.sidr_req_rcvd;
2752         param->pkey = __be16_to_cpu(sidr_req_msg->pkey);
2753         param->listen_id = listen_id;
2754         param->port = work->port->port_num;
2755         work->cm_event.private_data = &sidr_req_msg->private_data;
2756 }
2757
2758 static int cm_sidr_req_handler(struct cm_work *work)
2759 {
2760         struct ib_cm_id *cm_id;
2761         struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
2762         struct cm_sidr_req_msg *sidr_req_msg;
2763         struct ib_wc *wc;
2764         unsigned long flags;
2765
2766         cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL);
2767         if (IS_ERR(cm_id))
2768                 return PTR_ERR(cm_id);
2769         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2770
2771         /* Record SGID/SLID and request ID for lookup. */
2772         sidr_req_msg = (struct cm_sidr_req_msg *)
2773                                 work->mad_recv_wc->recv_buf.mad;
2774         wc = work->mad_recv_wc->wc;
2775         cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid);
2776         cm_id_priv->av.dgid.global.interface_id = 0;
2777         cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2778                                 work->mad_recv_wc->recv_buf.grh,
2779                                 &cm_id_priv->av);
2780         cm_id_priv->id.remote_id = sidr_req_msg->request_id;
2781         cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
2782         cm_id_priv->tid = sidr_req_msg->hdr.tid;
2783         atomic_inc(&cm_id_priv->work_count);
2784
2785         spin_lock_irqsave(&cm.lock, flags);
2786         cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
2787         if (cur_cm_id_priv) {
2788                 spin_unlock_irqrestore(&cm.lock, flags);
2789                 goto out; /* Duplicate message. */
2790         }
2791         cur_cm_id_priv = cm_find_listen(cm_id->device,
2792                                         sidr_req_msg->service_id,
2793                                         sidr_req_msg->private_data);
2794         if (!cur_cm_id_priv) {
2795                 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
2796                 spin_unlock_irqrestore(&cm.lock, flags);
2797                 /* todo: reply with no match */
2798                 goto out; /* No match. */
2799         }
2800         atomic_inc(&cur_cm_id_priv->refcount);
2801         spin_unlock_irqrestore(&cm.lock, flags);
2802
2803         cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler;
2804         cm_id_priv->id.context = cur_cm_id_priv->id.context;
2805         cm_id_priv->id.service_id = sidr_req_msg->service_id;
2806         cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL);
2807
2808         cm_format_sidr_req_event(work, &cur_cm_id_priv->id);
2809         cm_process_work(cm_id_priv, work);
2810         cm_deref_id(cur_cm_id_priv);
2811         return 0;
2812 out:
2813         ib_destroy_cm_id(&cm_id_priv->id);
2814         return -EINVAL;
2815 }
2816
2817 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
2818                                struct cm_id_private *cm_id_priv,
2819                                struct ib_cm_sidr_rep_param *param)
2820 {
2821         cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
2822                           cm_id_priv->tid);
2823         sidr_rep_msg->request_id = cm_id_priv->id.remote_id;
2824         sidr_rep_msg->status = param->status;
2825         cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num));
2826         sidr_rep_msg->service_id = cm_id_priv->id.service_id;
2827         sidr_rep_msg->qkey = cpu_to_be32(param->qkey);
2828
2829         if (param->info && param->info_length)
2830                 memcpy(sidr_rep_msg->info, param->info, param->info_length);
2831
2832         if (param->private_data && param->private_data_len)
2833                 memcpy(sidr_rep_msg->private_data, param->private_data,
2834                        param->private_data_len);
2835 }
2836
2837 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
2838                         struct ib_cm_sidr_rep_param *param)
2839 {
2840         struct cm_id_private *cm_id_priv;
2841         struct ib_mad_send_buf *msg;
2842         unsigned long flags;
2843         int ret;
2844
2845         if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
2846             (param->private_data &&
2847              param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE))
2848                 return -EINVAL;
2849
2850         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2851         spin_lock_irqsave(&cm_id_priv->lock, flags);
2852         if (cm_id->state != IB_CM_SIDR_REQ_RCVD) {
2853                 ret = -EINVAL;
2854                 goto error;
2855         }
2856
2857         ret = cm_alloc_msg(cm_id_priv, &msg);
2858         if (ret)
2859                 goto error;
2860
2861         cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
2862                            param);
2863         ret = ib_post_send_mad(msg, NULL);
2864         if (ret) {
2865                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2866                 cm_free_msg(msg);
2867                 return ret;
2868         }
2869         cm_id->state = IB_CM_IDLE;
2870         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2871
2872         spin_lock_irqsave(&cm.lock, flags);
2873         rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
2874         spin_unlock_irqrestore(&cm.lock, flags);
2875         return 0;
2876
2877 error:  spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2878         return ret;
2879 }
2880 EXPORT_SYMBOL(ib_send_cm_sidr_rep);
2881
2882 static void cm_format_sidr_rep_event(struct cm_work *work)
2883 {
2884         struct cm_sidr_rep_msg *sidr_rep_msg;
2885         struct ib_cm_sidr_rep_event_param *param;
2886
2887         sidr_rep_msg = (struct cm_sidr_rep_msg *)
2888                                 work->mad_recv_wc->recv_buf.mad;
2889         param = &work->cm_event.param.sidr_rep_rcvd;
2890         param->status = sidr_rep_msg->status;
2891         param->qkey = be32_to_cpu(sidr_rep_msg->qkey);
2892         param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg));
2893         param->info = &sidr_rep_msg->info;
2894         param->info_len = sidr_rep_msg->info_length;
2895         work->cm_event.private_data = &sidr_rep_msg->private_data;
2896 }
2897
2898 static int cm_sidr_rep_handler(struct cm_work *work)
2899 {
2900         struct cm_sidr_rep_msg *sidr_rep_msg;
2901         struct cm_id_private *cm_id_priv;
2902         unsigned long flags;
2903
2904         sidr_rep_msg = (struct cm_sidr_rep_msg *)
2905                                 work->mad_recv_wc->recv_buf.mad;
2906         cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0);
2907         if (!cm_id_priv)
2908                 return -EINVAL; /* Unmatched reply. */
2909
2910         spin_lock_irqsave(&cm_id_priv->lock, flags);
2911         if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
2912                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2913                 goto out;
2914         }
2915         cm_id_priv->id.state = IB_CM_IDLE;
2916         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2917         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2918
2919         cm_format_sidr_rep_event(work);
2920         cm_process_work(cm_id_priv, work);
2921         return 0;
2922 out:
2923         cm_deref_id(cm_id_priv);
2924         return -EINVAL;
2925 }
2926
2927 static void cm_process_send_error(struct ib_mad_send_buf *msg,
2928                                   enum ib_wc_status wc_status)
2929 {
2930         struct cm_id_private *cm_id_priv;
2931         struct ib_cm_event cm_event;
2932         enum ib_cm_state state;
2933         unsigned long flags;
2934         int ret;
2935
2936         memset(&cm_event, 0, sizeof cm_event);
2937         cm_id_priv = msg->context[0];
2938
2939         /* Discard old sends or ones without a response. */
2940         spin_lock_irqsave(&cm_id_priv->lock, flags);
2941         state = (enum ib_cm_state) (unsigned long) msg->context[1];
2942         if (msg != cm_id_priv->msg || state != cm_id_priv->id.state)
2943                 goto discard;
2944
2945         switch (state) {
2946         case IB_CM_REQ_SENT:
2947         case IB_CM_MRA_REQ_RCVD:
2948                 cm_reset_to_idle(cm_id_priv);
2949                 cm_event.event = IB_CM_REQ_ERROR;
2950                 break;
2951         case IB_CM_REP_SENT:
2952         case IB_CM_MRA_REP_RCVD:
2953                 cm_reset_to_idle(cm_id_priv);
2954                 cm_event.event = IB_CM_REP_ERROR;
2955                 break;
2956         case IB_CM_DREQ_SENT:
2957                 cm_enter_timewait(cm_id_priv);
2958                 cm_event.event = IB_CM_DREQ_ERROR;
2959                 break;
2960         case IB_CM_SIDR_REQ_SENT:
2961                 cm_id_priv->id.state = IB_CM_IDLE;
2962                 cm_event.event = IB_CM_SIDR_REQ_ERROR;
2963                 break;
2964         default:
2965                 goto discard;
2966         }
2967         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2968         cm_event.param.send_status = wc_status;
2969
2970         /* No other events can occur on the cm_id at this point. */
2971         ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
2972         cm_free_msg(msg);
2973         if (ret)
2974                 ib_destroy_cm_id(&cm_id_priv->id);
2975         return;
2976 discard:
2977         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2978         cm_free_msg(msg);
2979 }
2980
2981 static void cm_send_handler(struct ib_mad_agent *mad_agent,
2982                             struct ib_mad_send_wc *mad_send_wc)
2983 {
2984         struct ib_mad_send_buf *msg = mad_send_wc->send_buf;
2985
2986         switch (mad_send_wc->status) {
2987         case IB_WC_SUCCESS:
2988         case IB_WC_WR_FLUSH_ERR:
2989                 cm_free_msg(msg);
2990                 break;
2991         default:
2992                 if (msg->context[0] && msg->context[1])
2993                         cm_process_send_error(msg, mad_send_wc->status);
2994                 else
2995                         cm_free_msg(msg);
2996                 break;
2997         }
2998 }
2999
3000 static void cm_work_handler(struct work_struct *_work)
3001 {
3002         struct cm_work *work = container_of(_work, struct cm_work, work.work);
3003         int ret;
3004
3005         switch (work->cm_event.event) {
3006         case IB_CM_REQ_RECEIVED:
3007                 ret = cm_req_handler(work);
3008                 break;
3009         case IB_CM_MRA_RECEIVED:
3010                 ret = cm_mra_handler(work);
3011                 break;
3012         case IB_CM_REJ_RECEIVED:
3013                 ret = cm_rej_handler(work);
3014                 break;
3015         case IB_CM_REP_RECEIVED:
3016                 ret = cm_rep_handler(work);
3017                 break;
3018         case IB_CM_RTU_RECEIVED:
3019                 ret = cm_rtu_handler(work);
3020                 break;
3021         case IB_CM_USER_ESTABLISHED:
3022                 ret = cm_establish_handler(work);
3023                 break;
3024         case IB_CM_DREQ_RECEIVED:
3025                 ret = cm_dreq_handler(work);
3026                 break;
3027         case IB_CM_DREP_RECEIVED:
3028                 ret = cm_drep_handler(work);
3029                 break;
3030         case IB_CM_SIDR_REQ_RECEIVED:
3031                 ret = cm_sidr_req_handler(work);
3032                 break;
3033         case IB_CM_SIDR_REP_RECEIVED:
3034                 ret = cm_sidr_rep_handler(work);
3035                 break;
3036         case IB_CM_LAP_RECEIVED:
3037                 ret = cm_lap_handler(work);
3038                 break;
3039         case IB_CM_APR_RECEIVED:
3040                 ret = cm_apr_handler(work);
3041                 break;
3042         case IB_CM_TIMEWAIT_EXIT:
3043                 ret = cm_timewait_handler(work);
3044                 break;
3045         default:
3046                 ret = -EINVAL;
3047                 break;
3048         }
3049         if (ret)
3050                 cm_free_work(work);
3051 }
3052
3053 static int cm_establish(struct ib_cm_id *cm_id)
3054 {
3055         struct cm_id_private *cm_id_priv;
3056         struct cm_work *work;
3057         unsigned long flags;
3058         int ret = 0;
3059
3060         work = kmalloc(sizeof *work, GFP_ATOMIC);
3061         if (!work)
3062                 return -ENOMEM;
3063
3064         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3065         spin_lock_irqsave(&cm_id_priv->lock, flags);
3066         switch (cm_id->state)
3067         {
3068         case IB_CM_REP_SENT:
3069         case IB_CM_MRA_REP_RCVD:
3070                 cm_id->state = IB_CM_ESTABLISHED;
3071                 break;
3072         case IB_CM_ESTABLISHED:
3073                 ret = -EISCONN;
3074                 break;
3075         default:
3076                 ret = -EINVAL;
3077                 break;
3078         }
3079         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3080
3081         if (ret) {
3082                 kfree(work);
3083                 goto out;
3084         }
3085
3086         /*
3087          * The CM worker thread may try to destroy the cm_id before it
3088          * can execute this work item.  To prevent potential deadlock,
3089          * we need to find the cm_id once we're in the context of the
3090          * worker thread, rather than holding a reference on it.
3091          */
3092         INIT_DELAYED_WORK(&work->work, cm_work_handler);
3093         work->local_id = cm_id->local_id;
3094         work->remote_id = cm_id->remote_id;
3095         work->mad_recv_wc = NULL;
3096         work->cm_event.event = IB_CM_USER_ESTABLISHED;
3097         queue_delayed_work(cm.wq, &work->work, 0);
3098 out:
3099         return ret;
3100 }
3101
3102 static int cm_migrate(struct ib_cm_id *cm_id)
3103 {
3104         struct cm_id_private *cm_id_priv;
3105         unsigned long flags;
3106         int ret = 0;
3107
3108         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3109         spin_lock_irqsave(&cm_id_priv->lock, flags);
3110         if (cm_id->state == IB_CM_ESTABLISHED &&
3111             (cm_id->lap_state == IB_CM_LAP_UNINIT ||
3112              cm_id->lap_state == IB_CM_LAP_IDLE)) {
3113                 cm_id->lap_state = IB_CM_LAP_IDLE;
3114                 cm_id_priv->av = cm_id_priv->alt_av;
3115         } else
3116                 ret = -EINVAL;
3117         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3118
3119         return ret;
3120 }
3121
3122 int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event)
3123 {
3124         int ret;
3125
3126         switch (event) {
3127         case IB_EVENT_COMM_EST:
3128                 ret = cm_establish(cm_id);
3129                 break;
3130         case IB_EVENT_PATH_MIG:
3131                 ret = cm_migrate(cm_id);
3132                 break;
3133         default:
3134                 ret = -EINVAL;
3135         }
3136         return ret;
3137 }
3138 EXPORT_SYMBOL(ib_cm_notify);
3139
3140 static void cm_recv_handler(struct ib_mad_agent *mad_agent,
3141                             struct ib_mad_recv_wc *mad_recv_wc)
3142 {
3143         struct cm_work *work;
3144         enum ib_cm_event_type event;
3145         int paths = 0;
3146
3147         switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
3148         case CM_REQ_ATTR_ID:
3149                 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)->
3150                                                     alt_local_lid != 0);
3151                 event = IB_CM_REQ_RECEIVED;
3152                 break;
3153         case CM_MRA_ATTR_ID:
3154                 event = IB_CM_MRA_RECEIVED;
3155                 break;
3156         case CM_REJ_ATTR_ID:
3157                 event = IB_CM_REJ_RECEIVED;
3158                 break;
3159         case CM_REP_ATTR_ID:
3160                 event = IB_CM_REP_RECEIVED;
3161                 break;
3162         case CM_RTU_ATTR_ID:
3163                 event = IB_CM_RTU_RECEIVED;
3164                 break;
3165         case CM_DREQ_ATTR_ID:
3166                 event = IB_CM_DREQ_RECEIVED;
3167                 break;
3168         case CM_DREP_ATTR_ID:
3169                 event = IB_CM_DREP_RECEIVED;
3170                 break;
3171         case CM_SIDR_REQ_ATTR_ID:
3172                 event = IB_CM_SIDR_REQ_RECEIVED;
3173                 break;
3174         case CM_SIDR_REP_ATTR_ID:
3175                 event = IB_CM_SIDR_REP_RECEIVED;
3176                 break;
3177         case CM_LAP_ATTR_ID:
3178                 paths = 1;
3179                 event = IB_CM_LAP_RECEIVED;
3180                 break;
3181         case CM_APR_ATTR_ID:
3182                 event = IB_CM_APR_RECEIVED;
3183                 break;
3184         default:
3185                 ib_free_recv_mad(mad_recv_wc);
3186                 return;
3187         }
3188
3189         work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths,
3190                        GFP_KERNEL);
3191         if (!work) {
3192                 ib_free_recv_mad(mad_recv_wc);
3193                 return;
3194         }
3195
3196         INIT_DELAYED_WORK(&work->work, cm_work_handler);
3197         work->cm_event.event = event;
3198         work->mad_recv_wc = mad_recv_wc;
3199         work->port = (struct cm_port *)mad_agent->context;
3200         queue_delayed_work(cm.wq, &work->work, 0);
3201 }
3202
3203 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
3204                                 struct ib_qp_attr *qp_attr,
3205                                 int *qp_attr_mask)
3206 {
3207         unsigned long flags;
3208         int ret;
3209
3210         spin_lock_irqsave(&cm_id_priv->lock, flags);
3211         switch (cm_id_priv->id.state) {
3212         case IB_CM_REQ_SENT:
3213         case IB_CM_MRA_REQ_RCVD:
3214         case IB_CM_REQ_RCVD:
3215         case IB_CM_MRA_REQ_SENT:
3216         case IB_CM_REP_RCVD:
3217         case IB_CM_MRA_REP_SENT:
3218         case IB_CM_REP_SENT:
3219         case IB_CM_MRA_REP_RCVD:
3220         case IB_CM_ESTABLISHED:
3221                 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
3222                                 IB_QP_PKEY_INDEX | IB_QP_PORT;
3223                 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE;
3224                 if (cm_id_priv->responder_resources)
3225                         qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ |
3226                                                     IB_ACCESS_REMOTE_ATOMIC;
3227                 qp_attr->pkey_index = cm_id_priv->av.pkey_index;
3228                 qp_attr->port_num = cm_id_priv->av.port->port_num;
3229                 ret = 0;
3230                 break;
3231         default:
3232                 ret = -EINVAL;
3233                 break;
3234         }
3235         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3236         return ret;
3237 }
3238
3239 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
3240                                struct ib_qp_attr *qp_attr,
3241                                int *qp_attr_mask)
3242 {
3243         unsigned long flags;
3244         int ret;
3245
3246         spin_lock_irqsave(&cm_id_priv->lock, flags);
3247         switch (cm_id_priv->id.state) {
3248         case IB_CM_REQ_RCVD:
3249         case IB_CM_MRA_REQ_SENT:
3250         case IB_CM_REP_RCVD:
3251         case IB_CM_MRA_REP_SENT:
3252         case IB_CM_REP_SENT:
3253         case IB_CM_MRA_REP_RCVD:
3254         case IB_CM_ESTABLISHED:
3255                 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
3256                                 IB_QP_DEST_QPN | IB_QP_RQ_PSN;
3257                 qp_attr->ah_attr = cm_id_priv->av.ah_attr;
3258                 qp_attr->path_mtu = cm_id_priv->path_mtu;
3259                 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
3260                 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
3261                 if (cm_id_priv->qp_type == IB_QPT_RC) {
3262                         *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC |
3263                                          IB_QP_MIN_RNR_TIMER;
3264                         qp_attr->max_dest_rd_atomic =
3265                                         cm_id_priv->responder_resources;
3266                         qp_attr->min_rnr_timer = 0;
3267                 }
3268                 if (cm_id_priv->alt_av.ah_attr.dlid) {
3269                         *qp_attr_mask |= IB_QP_ALT_PATH;
3270                         qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
3271                         qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
3272                         qp_attr->alt_timeout =
3273                                         cm_id_priv->alt_av.packet_life_time + 1;
3274                         qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3275                 }
3276                 ret = 0;
3277                 break;
3278         default:
3279                 ret = -EINVAL;
3280                 break;
3281         }
3282         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3283         return ret;
3284 }
3285
3286 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv,
3287                                struct ib_qp_attr *qp_attr,
3288                                int *qp_attr_mask)
3289 {
3290         unsigned long flags;
3291         int ret;
3292
3293         spin_lock_irqsave(&cm_id_priv->lock, flags);
3294         switch (cm_id_priv->id.state) {
3295         /* Allow transition to RTS before sending REP */
3296         case IB_CM_REQ_RCVD:
3297         case IB_CM_MRA_REQ_SENT:
3298
3299         case IB_CM_REP_RCVD:
3300         case IB_CM_MRA_REP_SENT:
3301         case IB_CM_REP_SENT:
3302         case IB_CM_MRA_REP_RCVD:
3303         case IB_CM_ESTABLISHED:
3304                 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) {
3305                         *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN;
3306                         qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn);
3307                         if (cm_id_priv->qp_type == IB_QPT_RC) {
3308                                 *qp_attr_mask |= IB_QP_TIMEOUT | IB_QP_RETRY_CNT |
3309                                                  IB_QP_RNR_RETRY |
3310                                                  IB_QP_MAX_QP_RD_ATOMIC;
3311                                 qp_attr->timeout =
3312                                         cm_id_priv->av.packet_life_time + 1;
3313                                 qp_attr->retry_cnt = cm_id_priv->retry_count;
3314                                 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count;
3315                                 qp_attr->max_rd_atomic =
3316                                         cm_id_priv->initiator_depth;
3317                         }
3318                         if (cm_id_priv->alt_av.ah_attr.dlid) {
3319                                 *qp_attr_mask |= IB_QP_PATH_MIG_STATE;
3320                                 qp_attr->path_mig_state = IB_MIG_REARM;
3321                         }
3322                 } else {
3323                         *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE;
3324                         qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
3325                         qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
3326                         qp_attr->alt_timeout =
3327                                 cm_id_priv->alt_av.packet_life_time + 1;
3328                         qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3329                         qp_attr->path_mig_state = IB_MIG_REARM;
3330                 }
3331                 ret = 0;
3332                 break;
3333         default:
3334                 ret = -EINVAL;
3335                 break;
3336         }
3337         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3338         return ret;
3339 }
3340
3341 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
3342                        struct ib_qp_attr *qp_attr,
3343                        int *qp_attr_mask)
3344 {
3345         struct cm_id_private *cm_id_priv;
3346         int ret;
3347
3348         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3349         switch (qp_attr->qp_state) {
3350         case IB_QPS_INIT:
3351                 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask);
3352                 break;
3353         case IB_QPS_RTR:
3354                 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask);
3355                 break;
3356         case IB_QPS_RTS:
3357                 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask);
3358                 break;
3359         default:
3360                 ret = -EINVAL;
3361                 break;
3362         }
3363         return ret;
3364 }
3365 EXPORT_SYMBOL(ib_cm_init_qp_attr);
3366
3367 static void cm_add_one(struct ib_device *device)
3368 {
3369         struct cm_device *cm_dev;
3370         struct cm_port *port;
3371         struct ib_mad_reg_req reg_req = {
3372                 .mgmt_class = IB_MGMT_CLASS_CM,
3373                 .mgmt_class_version = IB_CM_CLASS_VERSION
3374         };
3375         struct ib_port_modify port_modify = {
3376                 .set_port_cap_mask = IB_PORT_CM_SUP
3377         };
3378         unsigned long flags;
3379         int ret;
3380         u8 i;
3381
3382         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
3383                 return;
3384
3385         cm_dev = kmalloc(sizeof(*cm_dev) + sizeof(*port) *
3386                          device->phys_port_cnt, GFP_KERNEL);
3387         if (!cm_dev)
3388                 return;
3389
3390         cm_dev->device = device;
3391
3392         set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
3393         for (i = 1; i <= device->phys_port_cnt; i++) {
3394                 port = &cm_dev->port[i-1];
3395                 port->cm_dev = cm_dev;
3396                 port->port_num = i;
3397                 port->mad_agent = ib_register_mad_agent(device, i,
3398                                                         IB_QPT_GSI,
3399                                                         &reg_req,
3400                                                         0,
3401                                                         cm_send_handler,
3402                                                         cm_recv_handler,
3403                                                         port);
3404                 if (IS_ERR(port->mad_agent))
3405                         goto error1;
3406
3407                 ret = ib_modify_port(device, i, 0, &port_modify);
3408                 if (ret)
3409                         goto error2;
3410         }
3411         ib_set_client_data(device, &cm_client, cm_dev);
3412
3413         write_lock_irqsave(&cm.device_lock, flags);
3414         list_add_tail(&cm_dev->list, &cm.device_list);
3415         write_unlock_irqrestore(&cm.device_lock, flags);
3416         return;
3417
3418 error2:
3419         ib_unregister_mad_agent(port->mad_agent);
3420 error1:
3421         port_modify.set_port_cap_mask = 0;
3422         port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
3423         while (--i) {
3424                 port = &cm_dev->port[i-1];
3425                 ib_modify_port(device, port->port_num, 0, &port_modify);
3426                 ib_unregister_mad_agent(port->mad_agent);
3427         }
3428         kfree(cm_dev);
3429 }
3430
3431 static void cm_remove_one(struct ib_device *device)
3432 {
3433         struct cm_device *cm_dev;
3434         struct cm_port *port;
3435         struct ib_port_modify port_modify = {
3436                 .clr_port_cap_mask = IB_PORT_CM_SUP
3437         };
3438         unsigned long flags;
3439         int i;
3440
3441         cm_dev = ib_get_client_data(device, &cm_client);
3442         if (!cm_dev)
3443                 return;
3444
3445         write_lock_irqsave(&cm.device_lock, flags);
3446         list_del(&cm_dev->list);
3447         write_unlock_irqrestore(&cm.device_lock, flags);
3448
3449         for (i = 1; i <= device->phys_port_cnt; i++) {
3450                 port = &cm_dev->port[i-1];
3451                 ib_modify_port(device, port->port_num, 0, &port_modify);
3452                 ib_unregister_mad_agent(port->mad_agent);
3453         }
3454         kfree(cm_dev);
3455 }
3456
3457 static int __init ib_cm_init(void)
3458 {
3459         int ret;
3460
3461         memset(&cm, 0, sizeof cm);
3462         INIT_LIST_HEAD(&cm.device_list);
3463         rwlock_init(&cm.device_lock);
3464         spin_lock_init(&cm.lock);
3465         cm.listen_service_table = RB_ROOT;
3466         cm.listen_service_id = __constant_be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID);
3467         cm.remote_id_table = RB_ROOT;
3468         cm.remote_qp_table = RB_ROOT;
3469         cm.remote_sidr_table = RB_ROOT;
3470         idr_init(&cm.local_id_table);
3471         get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand);
3472         idr_pre_get(&cm.local_id_table, GFP_KERNEL);
3473         INIT_LIST_HEAD(&cm.timewait_list);
3474
3475         cm.wq = create_workqueue("ib_cm");
3476         if (!cm.wq)
3477                 return -ENOMEM;
3478
3479         ret = ib_register_client(&cm_client);
3480         if (ret)
3481                 goto error;
3482
3483         return 0;
3484 error:
3485         destroy_workqueue(cm.wq);
3486         return ret;
3487 }
3488
3489 static void __exit ib_cm_cleanup(void)
3490 {
3491         struct cm_timewait_info *timewait_info, *tmp;
3492
3493         spin_lock_irq(&cm.lock);
3494         list_for_each_entry(timewait_info, &cm.timewait_list, list)
3495                 cancel_delayed_work(&timewait_info->work.work);
3496         spin_unlock_irq(&cm.lock);
3497
3498         destroy_workqueue(cm.wq);
3499
3500         list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) {
3501                 list_del(&timewait_info->list);
3502                 kfree(timewait_info);
3503         }
3504
3505         ib_unregister_client(&cm_client);
3506         idr_destroy(&cm.local_id_table);
3507 }
3508
3509 module_init(ib_cm_init);
3510 module_exit(ib_cm_cleanup);
3511