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   1 /*
   2  * Copyright (c) 2004-2006 Intel Corporation.  All rights reserved.
   3  * Copyright (c) 2004 Topspin Corporation.  All rights reserved.
   4  * Copyright (c) 2004, 2005 Voltaire Corporation.  All rights reserved.
   5  * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
   6  *
   7  * This software is available to you under a choice of one of two
   8  * licenses.  You may choose to be licensed under the terms of the GNU
   9  * General Public License (GPL) Version 2, available from the file
  10  * COPYING in the main directory of this source tree, or the
  11  * OpenIB.org BSD license below:
  12  *
  13  *     Redistribution and use in source and binary forms, with or
  14  *     without modification, are permitted provided that the following
  15  *     conditions are met:
  16  *
  17  *      - Redistributions of source code must retain the above
  18  *        copyright notice, this list of conditions and the following
  19  *        disclaimer.
  20  *
  21  *      - Redistributions in binary form must reproduce the above
  22  *        copyright notice, this list of conditions and the following
  23  *        disclaimer in the documentation and/or other materials
  24  *        provided with the distribution.
  25  *
  26  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  27  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  28  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  29  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  30  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  31  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  32  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  33  * SOFTWARE.
  34  *
  35  * $Id: cm.c 4311 2005-12-05 18:42:01Z sean.hefty $
  36  */
  37
  38 #include <linux/completion.h>
  39 #include <linux/dma-mapping.h>
  40 #include <linux/err.h>
  41 #include <linux/idr.h>
  42 #include <linux/interrupt.h>
  43 #include <linux/pci.h>
  44 #include <linux/random.h>
  45 #include <linux/rbtree.h>
  46 #include <linux/spinlock.h>
  47 #include <linux/workqueue.h>
  48
  49 #include <rdma/ib_cache.h>
  50 #include <rdma/ib_cm.h>
  51 #include "cm_msgs.h"
  52
  53 MODULE_AUTHOR("Sean Hefty");
  54 MODULE_DESCRIPTION("InfiniBand CM");
  55 MODULE_LICENSE("Dual BSD/GPL");
  56
  57 static void cm_add_one(struct ib_device *device);
  58 static void cm_remove_one(struct ib_device *device);
  59
  60 static struct ib_client cm_client = {
  61         .name   = "cm",
  62         .add    = cm_add_one,
  63         .remove = cm_remove_one
  64 };
  65
  66 static struct ib_cm {
  67         spinlock_t lock;
  68         struct list_head device_list;
  69         rwlock_t device_lock;
  70         struct rb_root listen_service_table;
  71         u64 listen_service_id;
  72         /* struct rb_root peer_service_table; todo: fix peer to peer */
  73         struct rb_root remote_qp_table;
  74         struct rb_root remote_id_table;
  75         struct rb_root remote_sidr_table;
  76         struct idr local_id_table;
  77         __be32 random_id_operand;
  78         struct 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         __be64 ca_guid;
  91         struct cm_port port[0];
  92 };
  93
  94 struct cm_av {
  95         struct cm_port *port;
  96         union ib_gid dgid;
  97         struct ib_ah_attr ah_attr;
  98         u16 pkey_index;
  99         u8 packet_life_time;
 100 };
 101
 102 struct cm_work {
 103         struct work_struct work;
 104         struct list_head list;
 105         struct cm_port *port;
 106         struct ib_mad_recv_wc *mad_recv_wc;     /* Received MADs */
 107         __be32 local_id;                        /* Established / timewait */
 108         __be32 remote_id;
 109         struct ib_cm_event cm_event;
 110         struct ib_sa_path_rec path[0];
 111 };
 112
 113 struct cm_timewait_info {
 114         struct cm_work work;                    /* Must be first. */
 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         u8 private_data_len;
 149         u8 max_cm_retries;
 150         u8 peer_to_peer;
 151         u8 responder_resources;
 152         u8 initiator_depth;
 153         u8 local_ack_timeout;
 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(void *data);
 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 = kmalloc(private_data_len, GFP_KERNEL);
 242         if (!data)
 243                 return ERR_PTR(-ENOMEM);
 244
 245         memcpy(data, private_data, private_data_len);
 246         return data;
 247 }
 248
 249 static void cm_set_private_data(struct cm_id_private *cm_id_priv,
 250                                  void *private_data, u8 private_data_len)
 251 {
 252         if (cm_id_priv->private_data && cm_id_priv->private_data_len)
 253                 kfree(cm_id_priv->private_data);
 254
 255         cm_id_priv->private_data = private_data;
 256         cm_id_priv->private_data_len = private_data_len;
 257 }
 258
 259 static void cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc,
 260                                     struct ib_grh *grh, struct cm_av *av)
 261 {
 262         av->port = port;
 263         av->pkey_index = wc->pkey_index;
 264         ib_init_ah_from_wc(port->cm_dev->device, port->port_num, wc,
 265                            grh, &av->ah_attr);
 266 }
 267
 268 static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av)
 269 {
 270         struct cm_device *cm_dev;
 271         struct cm_port *port = NULL;
 272         unsigned long flags;
 273         int ret;
 274         u8 p;
 275
 276         read_lock_irqsave(&cm.device_lock, flags);
 277         list_for_each_entry(cm_dev, &cm.device_list, list) {
 278                 if (!ib_find_cached_gid(cm_dev->device, &path->sgid,
 279                                         &p, NULL)) {
 280                         port = &cm_dev->port[p-1];
 281                         break;
 282                 }
 283         }
 284         read_unlock_irqrestore(&cm.device_lock, flags);
 285
 286         if (!port)
 287                 return -EINVAL;
 288
 289         ret = ib_find_cached_pkey(cm_dev->device, port->port_num,
 290                                   be16_to_cpu(path->pkey), &av->pkey_index);
 291         if (ret)
 292                 return ret;
 293
 294         av->port = port;
 295         ib_init_ah_from_path(cm_dev->device, port->port_num, path,
 296                              &av->ah_attr);
 297         av->packet_life_time = path->packet_life_time;
 298         return 0;
 299 }
 300
 301 static int cm_alloc_id(struct cm_id_private *cm_id_priv)
 302 {
 303         unsigned long flags;
 304         int ret, id;
 305         static int next_id;
 306
 307         do {
 308                 spin_lock_irqsave(&cm.lock, flags);
 309                 ret = idr_get_new_above(&cm.local_id_table, cm_id_priv,
 310                                         next_id++, &id);
 311                 spin_unlock_irqrestore(&cm.lock, flags);
 312         } while( (ret == -EAGAIN) && idr_pre_get(&cm.local_id_table, GFP_KERNEL) );
 313
 314         cm_id_priv->id.local_id = (__force __be32) (id ^ cm.random_id_operand);
 315         return ret;
 316 }
 317
 318 static void cm_free_id(__be32 local_id)
 319 {
 320         unsigned long flags;
 321
 322         spin_lock_irqsave(&cm.lock, flags);
 323         idr_remove(&cm.local_id_table,
 324                    (__force int) (local_id ^ cm.random_id_operand));
 325         spin_unlock_irqrestore(&cm.lock, flags);
 326 }
 327
 328 static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id)
 329 {
 330         struct cm_id_private *cm_id_priv;
 331
 332         cm_id_priv = idr_find(&cm.local_id_table,
 333                               (__force int) (local_id ^ cm.random_id_operand));
 334         if (cm_id_priv) {
 335                 if (cm_id_priv->id.remote_id == remote_id)
 336                         atomic_inc(&cm_id_priv->refcount);
 337                 else
 338                         cm_id_priv = NULL;
 339         }
 340
 341         return cm_id_priv;
 342 }
 343
 344 static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id)
 345 {
 346         struct cm_id_private *cm_id_priv;
 347         unsigned long flags;
 348
 349         spin_lock_irqsave(&cm.lock, flags);
 350         cm_id_priv = cm_get_id(local_id, remote_id);
 351         spin_unlock_irqrestore(&cm.lock, flags);
 352
 353         return cm_id_priv;
 354 }
 355
 356 static void cm_mask_copy(u8 *dst, u8 *src, u8 *mask)
 357 {
 358         int i;
 359
 360         for (i = 0; i < IB_CM_COMPARE_SIZE / sizeof(unsigned long); i++)
 361                 ((unsigned long *) dst)[i] = ((unsigned long *) src)[i] &
 362                                              ((unsigned long *) mask)[i];
 363 }
 364
 365 static int cm_compare_data(struct ib_cm_compare_data *src_data,
 366                            struct ib_cm_compare_data *dst_data)
 367 {
 368         u8 src[IB_CM_COMPARE_SIZE];
 369         u8 dst[IB_CM_COMPARE_SIZE];
 370
 371         if (!src_data || !dst_data)
 372                 return 0;
 373
 374         cm_mask_copy(src, src_data->data, dst_data->mask);
 375         cm_mask_copy(dst, dst_data->data, src_data->mask);
 376         return memcmp(src, dst, IB_CM_COMPARE_SIZE);
 377 }
 378
 379 static int cm_compare_private_data(u8 *private_data,
 380                                    struct ib_cm_compare_data *dst_data)
 381 {
 382         u8 src[IB_CM_COMPARE_SIZE];
 383
 384         if (!dst_data)
 385                 return 0;
 386
 387         cm_mask_copy(src, private_data, dst_data->mask);
 388         return memcmp(src, dst_data->data, IB_CM_COMPARE_SIZE);
 389 }
 390
 391 static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv)
 392 {
 393         struct rb_node **link = &cm.listen_service_table.rb_node;
 394         struct rb_node *parent = NULL;
 395         struct cm_id_private *cur_cm_id_priv;
 396         __be64 service_id = cm_id_priv->id.service_id;
 397         __be64 service_mask = cm_id_priv->id.service_mask;
 398         int data_cmp;
 399
 400         while (*link) {
 401                 parent = *link;
 402                 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
 403                                           service_node);
 404                 data_cmp = cm_compare_data(cm_id_priv->compare_data,
 405                                            cur_cm_id_priv->compare_data);
 406                 if ((cur_cm_id_priv->id.service_mask & service_id) ==
 407                     (service_mask & cur_cm_id_priv->id.service_id) &&
 408                     (cm_id_priv->id.device == cur_cm_id_priv->id.device) &&
 409                     !data_cmp)
 410                         return cur_cm_id_priv;
 411
 412                 if (cm_id_priv->id.device < cur_cm_id_priv->id.device)
 413                         link = &(*link)->rb_left;
 414                 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device)
 415                         link = &(*link)->rb_right;
 416                 else if (service_id < cur_cm_id_priv->id.service_id)
 417                         link = &(*link)->rb_left;
 418                 else if (service_id > cur_cm_id_priv->id.service_id)
 419                         link = &(*link)->rb_right;
 420                 else if (data_cmp < 0)
 421                         link = &(*link)->rb_left;
 422                 else
 423                         link = &(*link)->rb_right;
 424         }
 425         rb_link_node(&cm_id_priv->service_node, parent, link);
 426         rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table);
 427         return NULL;
 428 }
 429
 430 static struct cm_id_private * cm_find_listen(struct ib_device *device,
 431                                              __be64 service_id,
 432                                              u8 *private_data)
 433 {
 434         struct rb_node *node = cm.listen_service_table.rb_node;
 435         struct cm_id_private *cm_id_priv;
 436         int data_cmp;
 437
 438         while (node) {
 439                 cm_id_priv = rb_entry(node, struct cm_id_private, service_node);
 440                 data_cmp = cm_compare_private_data(private_data,
 441                                                    cm_id_priv->compare_data);
 442                 if ((cm_id_priv->id.service_mask & service_id) ==
 443                      cm_id_priv->id.service_id &&
 444                     (cm_id_priv->id.device == device) && !data_cmp)
 445                         return cm_id_priv;
 446
 447                 if (device < cm_id_priv->id.device)
 448                         node = node->rb_left;
 449                 else if (device > cm_id_priv->id.device)
 450                         node = node->rb_right;
 451                 else if (service_id < cm_id_priv->id.service_id)
 452                         node = node->rb_left;
 453                 else if (service_id > cm_id_priv->id.service_id)
 454                         node = node->rb_right;
 455                 else if (data_cmp < 0)
 456                         node = node->rb_left;
 457                 else
 458                         node = node->rb_right;
 459         }
 460         return NULL;
 461 }
 462
 463 static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info
 464                                                      *timewait_info)
 465 {
 466         struct rb_node **link = &cm.remote_id_table.rb_node;
 467         struct rb_node *parent = NULL;
 468         struct cm_timewait_info *cur_timewait_info;
 469         __be64 remote_ca_guid = timewait_info->remote_ca_guid;
 470         __be32 remote_id = timewait_info->work.remote_id;
 471
 472         while (*link) {
 473                 parent = *link;
 474                 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
 475                                              remote_id_node);
 476                 if (remote_id < cur_timewait_info->work.remote_id)
 477                         link = &(*link)->rb_left;
 478                 else if (remote_id > cur_timewait_info->work.remote_id)
 479                         link = &(*link)->rb_right;
 480                 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid)
 481                         link = &(*link)->rb_left;
 482                 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid)
 483                         link = &(*link)->rb_right;
 484                 else
 485                         return cur_timewait_info;
 486         }
 487         timewait_info->inserted_remote_id = 1;
 488         rb_link_node(&timewait_info->remote_id_node, parent, link);
 489         rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table);
 490         return NULL;
 491 }
 492
 493 static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid,
 494                                                    __be32 remote_id)
 495 {
 496         struct rb_node *node = cm.remote_id_table.rb_node;
 497         struct cm_timewait_info *timewait_info;
 498
 499         while (node) {
 500                 timewait_info = rb_entry(node, struct cm_timewait_info,
 501                                          remote_id_node);
 502                 if (remote_id < timewait_info->work.remote_id)
 503                         node = node->rb_left;
 504                 else if (remote_id > timewait_info->work.remote_id)
 505                         node = node->rb_right;
 506                 else if (remote_ca_guid < timewait_info->remote_ca_guid)
 507                         node = node->rb_left;
 508                 else if (remote_ca_guid > timewait_info->remote_ca_guid)
 509                         node = node->rb_right;
 510                 else
 511                         return timewait_info;
 512         }
 513         return NULL;
 514 }
 515
 516 static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info
 517                                                       *timewait_info)
 518 {
 519         struct rb_node **link = &cm.remote_qp_table.rb_node;
 520         struct rb_node *parent = NULL;
 521         struct cm_timewait_info *cur_timewait_info;
 522         __be64 remote_ca_guid = timewait_info->remote_ca_guid;
 523         __be32 remote_qpn = timewait_info->remote_qpn;
 524
 525         while (*link) {
 526                 parent = *link;
 527                 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
 528                                              remote_qp_node);
 529                 if (remote_qpn < cur_timewait_info->remote_qpn)
 530                         link = &(*link)->rb_left;
 531                 else if (remote_qpn > cur_timewait_info->remote_qpn)
 532                         link = &(*link)->rb_right;
 533                 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid)
 534                         link = &(*link)->rb_left;
 535                 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid)
 536                         link = &(*link)->rb_right;
 537                 else
 538                         return cur_timewait_info;
 539         }
 540         timewait_info->inserted_remote_qp = 1;
 541         rb_link_node(&timewait_info->remote_qp_node, parent, link);
 542         rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table);
 543         return NULL;
 544 }
 545
 546 static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private
 547                                                     *cm_id_priv)
 548 {
 549         struct rb_node **link = &cm.remote_sidr_table.rb_node;
 550         struct rb_node *parent = NULL;
 551         struct cm_id_private *cur_cm_id_priv;
 552         union ib_gid *port_gid = &cm_id_priv->av.dgid;
 553         __be32 remote_id = cm_id_priv->id.remote_id;
 554
 555         while (*link) {
 556                 parent = *link;
 557                 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
 558                                           sidr_id_node);
 559                 if (remote_id < cur_cm_id_priv->id.remote_id)
 560                         link = &(*link)->rb_left;
 561                 else if (remote_id > cur_cm_id_priv->id.remote_id)
 562                         link = &(*link)->rb_right;
 563                 else {
 564                         int cmp;
 565                         cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid,
 566                                      sizeof *port_gid);
 567                         if (cmp < 0)
 568                                 link = &(*link)->rb_left;
 569                         else if (cmp > 0)
 570                                 link = &(*link)->rb_right;
 571                         else
 572                                 return cur_cm_id_priv;
 573                 }
 574         }
 575         rb_link_node(&cm_id_priv->sidr_id_node, parent, link);
 576         rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
 577         return NULL;
 578 }
 579
 580 static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv,
 581                                enum ib_cm_sidr_status status)
 582 {
 583         struct ib_cm_sidr_rep_param param;
 584
 585         memset(&param, 0, sizeof param);
 586         param.status = status;
 587         ib_send_cm_sidr_rep(&cm_id_priv->id, &param);
 588 }
 589
 590 struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
 591                                  ib_cm_handler cm_handler,
 592                                  void *context)
 593 {
 594         struct cm_id_private *cm_id_priv;
 595         int ret;
 596
 597         cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL);
 598         if (!cm_id_priv)
 599                 return ERR_PTR(-ENOMEM);
 600
 601         cm_id_priv->id.state = IB_CM_IDLE;
 602         cm_id_priv->id.device = device;
 603         cm_id_priv->id.cm_handler = cm_handler;
 604         cm_id_priv->id.context = context;
 605         cm_id_priv->id.remote_cm_qpn = 1;
 606         ret = cm_alloc_id(cm_id_priv);
 607         if (ret)
 608                 goto error;
 609
 610         spin_lock_init(&cm_id_priv->lock);
 611         init_completion(&cm_id_priv->comp);
 612         INIT_LIST_HEAD(&cm_id_priv->work_list);
 613         atomic_set(&cm_id_priv->work_count, -1);
 614         atomic_set(&cm_id_priv->refcount, 1);
 615         return &cm_id_priv->id;
 616
 617 error:
 618         kfree(cm_id_priv);
 619         return ERR_PTR(-ENOMEM);
 620 }
 621 EXPORT_SYMBOL(ib_create_cm_id);
 622
 623 static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv)
 624 {
 625         struct cm_work *work;
 626
 627         if (list_empty(&cm_id_priv->work_list))
 628                 return NULL;
 629
 630         work = list_entry(cm_id_priv->work_list.next, struct cm_work, list);
 631         list_del(&work->list);
 632         return work;
 633 }
 634
 635 static void cm_free_work(struct cm_work *work)
 636 {
 637         if (work->mad_recv_wc)
 638                 ib_free_recv_mad(work->mad_recv_wc);
 639         kfree(work);
 640 }
 641
 642 static inline int cm_convert_to_ms(int iba_time)
 643 {
 644         /* approximate conversion to ms from 4.096us x 2^iba_time */
 645         return 1 << max(iba_time - 8, 0);
 646 }
 647
 648 static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info)
 649 {
 650         unsigned long flags;
 651
 652         if (!timewait_info->inserted_remote_id &&
 653             !timewait_info->inserted_remote_qp)
 654             return;
 655
 656         spin_lock_irqsave(&cm.lock, flags);
 657         if (timewait_info->inserted_remote_id) {
 658                 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table);
 659                 timewait_info->inserted_remote_id = 0;
 660         }
 661
 662         if (timewait_info->inserted_remote_qp) {
 663                 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table);
 664                 timewait_info->inserted_remote_qp = 0;
 665         }
 666         spin_unlock_irqrestore(&cm.lock, flags);
 667 }
 668
 669 static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id)
 670 {
 671         struct cm_timewait_info *timewait_info;
 672
 673         timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL);
 674         if (!timewait_info)
 675                 return ERR_PTR(-ENOMEM);
 676
 677         timewait_info->work.local_id = local_id;
 678         INIT_WORK(&timewait_info->work.work, cm_work_handler,
 679                   &timewait_info->work);
 680         timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT;
 681         return timewait_info;
 682 }
 683
 684 static void cm_enter_timewait(struct cm_id_private *cm_id_priv)
 685 {
 686         int wait_time;
 687
 688         /*
 689          * The cm_id could be destroyed by the user before we exit timewait.
 690          * To protect against this, we search for the cm_id after exiting
 691          * timewait before notifying the user that we've exited timewait.
 692          */
 693         cm_id_priv->id.state = IB_CM_TIMEWAIT;
 694         wait_time = cm_convert_to_ms(cm_id_priv->local_ack_timeout);
 695         queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work,
 696                            msecs_to_jiffies(wait_time));
 697         cm_id_priv->timewait_info = NULL;
 698 }
 699
 700 static void cm_reset_to_idle(struct cm_id_private *cm_id_priv)
 701 {
 702         cm_id_priv->id.state = IB_CM_IDLE;
 703         if (cm_id_priv->timewait_info) {
 704                 cm_cleanup_timewait(cm_id_priv->timewait_info);
 705                 kfree(cm_id_priv->timewait_info);
 706                 cm_id_priv->timewait_info = NULL;
 707         }
 708 }
 709
 710 static void cm_destroy_id(struct ib_cm_id *cm_id, int err)
 711 {
 712         struct cm_id_private *cm_id_priv;
 713         struct cm_work *work;
 714         unsigned long flags;
 715
 716         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
 717 retest:
 718         spin_lock_irqsave(&cm_id_priv->lock, flags);
 719         switch (cm_id->state) {
 720         case IB_CM_LISTEN:
 721                 cm_id->state = IB_CM_IDLE;
 722                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 723                 spin_lock_irqsave(&cm.lock, flags);
 724                 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table);
 725                 spin_unlock_irqrestore(&cm.lock, flags);
 726                 break;
 727         case IB_CM_SIDR_REQ_SENT:
 728                 cm_id->state = IB_CM_IDLE;
 729                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
 730                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 731                 break;
 732         case IB_CM_SIDR_REQ_RCVD:
 733                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 734                 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT);
 735                 break;
 736         case IB_CM_REQ_SENT:
 737                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
 738                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 739                 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT,
 740                                &cm_id_priv->av.port->cm_dev->ca_guid,
 741                                sizeof cm_id_priv->av.port->cm_dev->ca_guid,
 742                                NULL, 0);
 743                 break;
 744         case IB_CM_REQ_RCVD:
 745                 if (err == -ENOMEM) {
 746                         /* Do not reject to allow future retries. */
 747                         cm_reset_to_idle(cm_id_priv);
 748                         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 749                 } else {
 750                         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 751                         ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
 752                                        NULL, 0, NULL, 0);
 753                 }
 754                 break;
 755         case IB_CM_MRA_REQ_RCVD:
 756         case IB_CM_REP_SENT:
 757         case IB_CM_MRA_REP_RCVD:
 758                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
 759                 /* Fall through */
 760         case IB_CM_MRA_REQ_SENT:
 761         case IB_CM_REP_RCVD:
 762         case IB_CM_MRA_REP_SENT:
 763                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 764                 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
 765                                NULL, 0, NULL, 0);
 766                 break;
 767         case IB_CM_ESTABLISHED:
 768                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 769                 ib_send_cm_dreq(cm_id, NULL, 0);
 770                 goto retest;
 771         case IB_CM_DREQ_SENT:
 772                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
 773                 cm_enter_timewait(cm_id_priv);
 774                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 775                 break;
 776         case IB_CM_DREQ_RCVD:
 777                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 778                 ib_send_cm_drep(cm_id, NULL, 0);
 779                 break;
 780         default:
 781                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 782                 break;
 783         }
 784
 785         cm_free_id(cm_id->local_id);
 786         cm_deref_id(cm_id_priv);
 787         wait_for_completion(&cm_id_priv->comp);
 788         while ((work = cm_dequeue_work(cm_id_priv)) != NULL)
 789                 cm_free_work(work);
 790         kfree(cm_id_priv->compare_data);
 791         kfree(cm_id_priv->private_data);
 792         kfree(cm_id_priv);
 793 }
 794
 795 void ib_destroy_cm_id(struct ib_cm_id *cm_id)
 796 {
 797         cm_destroy_id(cm_id, 0);
 798 }
 799 EXPORT_SYMBOL(ib_destroy_cm_id);
 800
 801 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask,
 802                  struct ib_cm_compare_data *compare_data)
 803 {
 804         struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
 805         unsigned long flags;
 806         int ret = 0;
 807
 808         service_mask = service_mask ? service_mask :
 809                        __constant_cpu_to_be64(~0ULL);
 810         service_id &= service_mask;
 811         if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID &&
 812             (service_id != IB_CM_ASSIGN_SERVICE_ID))
 813                 return -EINVAL;
 814
 815         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
 816         if (cm_id->state != IB_CM_IDLE)
 817                 return -EINVAL;
 818
 819         if (compare_data) {
 820                 cm_id_priv->compare_data = kzalloc(sizeof *compare_data,
 821                                                    GFP_KERNEL);
 822                 if (!cm_id_priv->compare_data)
 823                         return -ENOMEM;
 824                 cm_mask_copy(cm_id_priv->compare_data->data,
 825                              compare_data->data, compare_data->mask);
 826                 memcpy(cm_id_priv->compare_data->mask, compare_data->mask,
 827                        IB_CM_COMPARE_SIZE);
 828         }
 829
 830         cm_id->state = IB_CM_LISTEN;
 831
 832         spin_lock_irqsave(&cm.lock, flags);
 833         if (service_id == IB_CM_ASSIGN_SERVICE_ID) {
 834                 cm_id->service_id = cpu_to_be64(cm.listen_service_id++);
 835                 cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
 836         } else {
 837                 cm_id->service_id = service_id;
 838                 cm_id->service_mask = service_mask;
 839         }
 840         cur_cm_id_priv = cm_insert_listen(cm_id_priv);
 841         spin_unlock_irqrestore(&cm.lock, flags);
 842
 843         if (cur_cm_id_priv) {
 844                 cm_id->state = IB_CM_IDLE;
 845                 kfree(cm_id_priv->compare_data);
 846                 cm_id_priv->compare_data = NULL;
 847                 ret = -EBUSY;
 848         }
 849         return ret;
 850 }
 851 EXPORT_SYMBOL(ib_cm_listen);
 852
 853 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv,
 854                           enum cm_msg_sequence msg_seq)
 855 {
 856         u64 hi_tid, low_tid;
 857
 858         hi_tid   = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32;
 859         low_tid  = (u64) ((__force u32)cm_id_priv->id.local_id |
 860                           (msg_seq << 30));
 861         return cpu_to_be64(hi_tid | low_tid);
 862 }
 863
 864 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr,
 865                               __be16 attr_id, __be64 tid)
 866 {
 867         hdr->base_version  = IB_MGMT_BASE_VERSION;
 868         hdr->mgmt_class    = IB_MGMT_CLASS_CM;
 869         hdr->class_version = IB_CM_CLASS_VERSION;
 870         hdr->method        = IB_MGMT_METHOD_SEND;
 871         hdr->attr_id       = attr_id;
 872         hdr->tid           = tid;
 873 }
 874
 875 static void cm_format_req(struct cm_req_msg *req_msg,
 876                           struct cm_id_private *cm_id_priv,
 877                           struct ib_cm_req_param *param)
 878 {
 879         cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID,
 880                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ));
 881
 882         req_msg->local_comm_id = cm_id_priv->id.local_id;
 883         req_msg->service_id = param->service_id;
 884         req_msg->local_ca_guid = cm_id_priv->av.port->cm_dev->ca_guid;
 885         cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num));
 886         cm_req_set_resp_res(req_msg, param->responder_resources);
 887         cm_req_set_init_depth(req_msg, param->initiator_depth);
 888         cm_req_set_remote_resp_timeout(req_msg,
 889                                        param->remote_cm_response_timeout);
 890         cm_req_set_qp_type(req_msg, param->qp_type);
 891         cm_req_set_flow_ctrl(req_msg, param->flow_control);
 892         cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn));
 893         cm_req_set_local_resp_timeout(req_msg,
 894                                       param->local_cm_response_timeout);
 895         cm_req_set_retry_count(req_msg, param->retry_count);
 896         req_msg->pkey = param->primary_path->pkey;
 897         cm_req_set_path_mtu(req_msg, param->primary_path->mtu);
 898         cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count);
 899         cm_req_set_max_cm_retries(req_msg, param->max_cm_retries);
 900         cm_req_set_srq(req_msg, param->srq);
 901
 902         req_msg->primary_local_lid = param->primary_path->slid;
 903         req_msg->primary_remote_lid = param->primary_path->dlid;
 904         req_msg->primary_local_gid = param->primary_path->sgid;
 905         req_msg->primary_remote_gid = param->primary_path->dgid;
 906         cm_req_set_primary_flow_label(req_msg, param->primary_path->flow_label);
 907         cm_req_set_primary_packet_rate(req_msg, param->primary_path->rate);
 908         req_msg->primary_traffic_class = param->primary_path->traffic_class;
 909         req_msg->primary_hop_limit = param->primary_path->hop_limit;
 910         cm_req_set_primary_sl(req_msg, param->primary_path->sl);
 911         cm_req_set_primary_subnet_local(req_msg, 1); /* local only... */
 912         cm_req_set_primary_local_ack_timeout(req_msg,
 913                 min(31, param->primary_path->packet_life_time + 1));
 914
 915         if (param->alternate_path) {
 916                 req_msg->alt_local_lid = param->alternate_path->slid;
 917                 req_msg->alt_remote_lid = param->alternate_path->dlid;
 918                 req_msg->alt_local_gid = param->alternate_path->sgid;
 919                 req_msg->alt_remote_gid = param->alternate_path->dgid;
 920                 cm_req_set_alt_flow_label(req_msg,
 921                                           param->alternate_path->flow_label);
 922                 cm_req_set_alt_packet_rate(req_msg, param->alternate_path->rate);
 923                 req_msg->alt_traffic_class = param->alternate_path->traffic_class;
 924                 req_msg->alt_hop_limit = param->alternate_path->hop_limit;
 925                 cm_req_set_alt_sl(req_msg, param->alternate_path->sl);
 926                 cm_req_set_alt_subnet_local(req_msg, 1); /* local only... */
 927                 cm_req_set_alt_local_ack_timeout(req_msg,
 928                         min(31, param->alternate_path->packet_life_time + 1));
 929         }
 930
 931         if (param->private_data && param->private_data_len)
 932                 memcpy(req_msg->private_data, param->private_data,
 933                        param->private_data_len);
 934 }
 935
 936 static int cm_validate_req_param(struct ib_cm_req_param *param)
 937 {
 938         /* peer-to-peer not supported */
 939         if (param->peer_to_peer)
 940                 return -EINVAL;
 941
 942         if (!param->primary_path)
 943                 return -EINVAL;
 944
 945         if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC)
 946                 return -EINVAL;
 947
 948         if (param->private_data &&
 949             param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE)
 950                 return -EINVAL;
 951
 952         if (param->alternate_path &&
 953             (param->alternate_path->pkey != param->primary_path->pkey ||
 954              param->alternate_path->mtu != param->primary_path->mtu))
 955                 return -EINVAL;
 956
 957         return 0;
 958 }
 959
 960 int ib_send_cm_req(struct ib_cm_id *cm_id,
 961                    struct ib_cm_req_param *param)
 962 {
 963         struct cm_id_private *cm_id_priv;
 964         struct cm_req_msg *req_msg;
 965         unsigned long flags;
 966         int ret;
 967
 968         ret = cm_validate_req_param(param);
 969         if (ret)
 970                 return ret;
 971
 972         /* Verify that we're not in timewait. */
 973         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
 974         spin_lock_irqsave(&cm_id_priv->lock, flags);
 975         if (cm_id->state != IB_CM_IDLE) {
 976                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 977                 ret = -EINVAL;
 978                 goto out;
 979         }
 980         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 981
 982         cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
 983                                                             id.local_id);
 984         if (IS_ERR(cm_id_priv->timewait_info)) {
 985                 ret = PTR_ERR(cm_id_priv->timewait_info);
 986                 goto out;
 987         }
 988
 989         ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av);
 990         if (ret)
 991                 goto error1;
 992         if (param->alternate_path) {
 993                 ret = cm_init_av_by_path(param->alternate_path,
 994                                          &cm_id_priv->alt_av);
 995                 if (ret)
 996                         goto error1;
 997         }
 998         cm_id->service_id = param->service_id;
 999         cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
1000         cm_id_priv->timeout_ms = cm_convert_to_ms(
1001                                     param->primary_path->packet_life_time) * 2 +
1002                                  cm_convert_to_ms(
1003                                     param->remote_cm_response_timeout);
1004         cm_id_priv->max_cm_retries = param->max_cm_retries;
1005         cm_id_priv->initiator_depth = param->initiator_depth;
1006         cm_id_priv->responder_resources = param->responder_resources;
1007         cm_id_priv->retry_count = param->retry_count;
1008         cm_id_priv->path_mtu = param->primary_path->mtu;
1009         cm_id_priv->qp_type = param->qp_type;
1010
1011         ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg);
1012         if (ret)
1013                 goto error1;
1014
1015         req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad;
1016         cm_format_req(req_msg, cm_id_priv, param);
1017         cm_id_priv->tid = req_msg->hdr.tid;
1018         cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms;
1019         cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT;
1020
1021         cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg);
1022         cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg);
1023         cm_id_priv->local_ack_timeout =
1024                                 cm_req_get_primary_local_ack_timeout(req_msg);
1025
1026         spin_lock_irqsave(&cm_id_priv->lock, flags);
1027         ret = ib_post_send_mad(cm_id_priv->msg, NULL);
1028         if (ret) {
1029                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1030                 goto error2;
1031         }
1032         BUG_ON(cm_id->state != IB_CM_IDLE);
1033         cm_id->state = IB_CM_REQ_SENT;
1034         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1035         return 0;
1036
1037 error2: cm_free_msg(cm_id_priv->msg);
1038 error1: kfree(cm_id_priv->timewait_info);
1039 out:    return ret;
1040 }
1041 EXPORT_SYMBOL(ib_send_cm_req);
1042
1043 static int cm_issue_rej(struct cm_port *port,
1044                         struct ib_mad_recv_wc *mad_recv_wc,
1045                         enum ib_cm_rej_reason reason,
1046                         enum cm_msg_response msg_rejected,
1047                         void *ari, u8 ari_length)
1048 {
1049         struct ib_mad_send_buf *msg = NULL;
1050         struct cm_rej_msg *rej_msg, *rcv_msg;
1051         int ret;
1052
1053         ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
1054         if (ret)
1055                 return ret;
1056
1057         /* We just need common CM header information.  Cast to any message. */
1058         rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad;
1059         rej_msg = (struct cm_rej_msg *) msg->mad;
1060
1061         cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid);
1062         rej_msg->remote_comm_id = rcv_msg->local_comm_id;
1063         rej_msg->local_comm_id = rcv_msg->remote_comm_id;
1064         cm_rej_set_msg_rejected(rej_msg, msg_rejected);
1065         rej_msg->reason = cpu_to_be16(reason);
1066
1067         if (ari && ari_length) {
1068                 cm_rej_set_reject_info_len(rej_msg, ari_length);
1069                 memcpy(rej_msg->ari, ari, ari_length);
1070         }
1071
1072         ret = ib_post_send_mad(msg, NULL);
1073         if (ret)
1074                 cm_free_msg(msg);
1075
1076         return ret;
1077 }
1078
1079 static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid,
1080                                     __be32 local_qpn, __be32 remote_qpn)
1081 {
1082         return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) ||
1083                 ((local_ca_guid == remote_ca_guid) &&
1084                  (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn))));
1085 }
1086
1087 static void cm_format_paths_from_req(struct cm_req_msg *req_msg,
1088                                             struct ib_sa_path_rec *primary_path,
1089                                             struct ib_sa_path_rec *alt_path)
1090 {
1091         memset(primary_path, 0, sizeof *primary_path);
1092         primary_path->dgid = req_msg->primary_local_gid;
1093         primary_path->sgid = req_msg->primary_remote_gid;
1094         primary_path->dlid = req_msg->primary_local_lid;
1095         primary_path->slid = req_msg->primary_remote_lid;
1096         primary_path->flow_label = cm_req_get_primary_flow_label(req_msg);
1097         primary_path->hop_limit = req_msg->primary_hop_limit;
1098         primary_path->traffic_class = req_msg->primary_traffic_class;
1099         primary_path->reversible = 1;
1100         primary_path->pkey = req_msg->pkey;
1101         primary_path->sl = cm_req_get_primary_sl(req_msg);
1102         primary_path->mtu_selector = IB_SA_EQ;
1103         primary_path->mtu = cm_req_get_path_mtu(req_msg);
1104         primary_path->rate_selector = IB_SA_EQ;
1105         primary_path->rate = cm_req_get_primary_packet_rate(req_msg);
1106         primary_path->packet_life_time_selector = IB_SA_EQ;
1107         primary_path->packet_life_time =
1108                 cm_req_get_primary_local_ack_timeout(req_msg);
1109         primary_path->packet_life_time -= (primary_path->packet_life_time > 0);
1110
1111         if (req_msg->alt_local_lid) {
1112                 memset(alt_path, 0, sizeof *alt_path);
1113                 alt_path->dgid = req_msg->alt_local_gid;
1114                 alt_path->sgid = req_msg->alt_remote_gid;
1115                 alt_path->dlid = req_msg->alt_local_lid;
1116                 alt_path->slid = req_msg->alt_remote_lid;
1117                 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg);
1118                 alt_path->hop_limit = req_msg->alt_hop_limit;
1119                 alt_path->traffic_class = req_msg->alt_traffic_class;
1120                 alt_path->reversible = 1;
1121                 alt_path->pkey = req_msg->pkey;
1122                 alt_path->sl = cm_req_get_alt_sl(req_msg);
1123                 alt_path->mtu_selector = IB_SA_EQ;
1124                 alt_path->mtu = cm_req_get_path_mtu(req_msg);
1125                 alt_path->rate_selector = IB_SA_EQ;
1126                 alt_path->rate = cm_req_get_alt_packet_rate(req_msg);
1127                 alt_path->packet_life_time_selector = IB_SA_EQ;
1128                 alt_path->packet_life_time =
1129                         cm_req_get_alt_local_ack_timeout(req_msg);
1130                 alt_path->packet_life_time -= (alt_path->packet_life_time > 0);
1131         }
1132 }
1133
1134 static void cm_format_req_event(struct cm_work *work,
1135                                 struct cm_id_private *cm_id_priv,
1136                                 struct ib_cm_id *listen_id)
1137 {
1138         struct cm_req_msg *req_msg;
1139         struct ib_cm_req_event_param *param;
1140
1141         req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1142         param = &work->cm_event.param.req_rcvd;
1143         param->listen_id = listen_id;
1144         param->port = cm_id_priv->av.port->port_num;
1145         param->primary_path = &work->path[0];
1146         if (req_msg->alt_local_lid)
1147                 param->alternate_path = &work->path[1];
1148         else
1149                 param->alternate_path = NULL;
1150         param->remote_ca_guid = req_msg->local_ca_guid;
1151         param->remote_qkey = be32_to_cpu(req_msg->local_qkey);
1152         param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg));
1153         param->qp_type = cm_req_get_qp_type(req_msg);
1154         param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg));
1155         param->responder_resources = cm_req_get_init_depth(req_msg);
1156         param->initiator_depth = cm_req_get_resp_res(req_msg);
1157         param->local_cm_response_timeout =
1158                                         cm_req_get_remote_resp_timeout(req_msg);
1159         param->flow_control = cm_req_get_flow_ctrl(req_msg);
1160         param->remote_cm_response_timeout =
1161                                         cm_req_get_local_resp_timeout(req_msg);
1162         param->retry_count = cm_req_get_retry_count(req_msg);
1163         param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1164         param->srq = cm_req_get_srq(req_msg);
1165         work->cm_event.private_data = &req_msg->private_data;
1166 }
1167
1168 static void cm_process_work(struct cm_id_private *cm_id_priv,
1169                             struct cm_work *work)
1170 {
1171         unsigned long flags;
1172         int ret;
1173
1174         /* We will typically only have the current event to report. */
1175         ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
1176         cm_free_work(work);
1177
1178         while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) {
1179                 spin_lock_irqsave(&cm_id_priv->lock, flags);
1180                 work = cm_dequeue_work(cm_id_priv);
1181                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1182                 BUG_ON(!work);
1183                 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id,
1184                                                 &work->cm_event);
1185                 cm_free_work(work);
1186         }
1187         cm_deref_id(cm_id_priv);
1188         if (ret)
1189                 cm_destroy_id(&cm_id_priv->id, ret);
1190 }
1191
1192 static void cm_format_mra(struct cm_mra_msg *mra_msg,
1193                           struct cm_id_private *cm_id_priv,
1194                           enum cm_msg_response msg_mraed, u8 service_timeout,
1195                           const void *private_data, u8 private_data_len)
1196 {
1197         cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid);
1198         cm_mra_set_msg_mraed(mra_msg, msg_mraed);
1199         mra_msg->local_comm_id = cm_id_priv->id.local_id;
1200         mra_msg->remote_comm_id = cm_id_priv->id.remote_id;
1201         cm_mra_set_service_timeout(mra_msg, service_timeout);
1202
1203         if (private_data && private_data_len)
1204                 memcpy(mra_msg->private_data, private_data, private_data_len);
1205 }
1206
1207 static void cm_format_rej(struct cm_rej_msg *rej_msg,
1208                           struct cm_id_private *cm_id_priv,
1209                           enum ib_cm_rej_reason reason,
1210                           void *ari,
1211                           u8 ari_length,
1212                           const void *private_data,
1213                           u8 private_data_len)
1214 {
1215         cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid);
1216         rej_msg->remote_comm_id = cm_id_priv->id.remote_id;
1217
1218         switch(cm_id_priv->id.state) {
1219         case IB_CM_REQ_RCVD:
1220                 rej_msg->local_comm_id = 0;
1221                 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1222                 break;
1223         case IB_CM_MRA_REQ_SENT:
1224                 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1225                 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1226                 break;
1227         case IB_CM_REP_RCVD:
1228         case IB_CM_MRA_REP_SENT:
1229                 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1230                 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP);
1231                 break;
1232         default:
1233                 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1234                 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER);
1235                 break;
1236         }
1237
1238         rej_msg->reason = cpu_to_be16(reason);
1239         if (ari && ari_length) {
1240                 cm_rej_set_reject_info_len(rej_msg, ari_length);
1241                 memcpy(rej_msg->ari, ari, ari_length);
1242         }
1243
1244         if (private_data && private_data_len)
1245                 memcpy(rej_msg->private_data, private_data, private_data_len);
1246 }
1247
1248 static void cm_dup_req_handler(struct cm_work *work,
1249                                struct cm_id_private *cm_id_priv)
1250 {
1251         struct ib_mad_send_buf *msg = NULL;
1252         unsigned long flags;
1253         int ret;
1254
1255         /* Quick state check to discard duplicate REQs. */
1256         if (cm_id_priv->id.state == IB_CM_REQ_RCVD)
1257                 return;
1258
1259         ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1260         if (ret)
1261                 return;
1262
1263         spin_lock_irqsave(&cm_id_priv->lock, flags);
1264         switch (cm_id_priv->id.state) {
1265         case IB_CM_MRA_REQ_SENT:
1266                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1267                               CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout,
1268                               cm_id_priv->private_data,
1269                               cm_id_priv->private_data_len);
1270                 break;
1271         case IB_CM_TIMEWAIT:
1272                 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv,
1273                               IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0);
1274                 break;
1275         default:
1276                 goto unlock;
1277         }
1278         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1279
1280         ret = ib_post_send_mad(msg, NULL);
1281         if (ret)
1282                 goto free;
1283         return;
1284
1285 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1286 free:   cm_free_msg(msg);
1287 }
1288
1289 static struct cm_id_private * cm_match_req(struct cm_work *work,
1290                                            struct cm_id_private *cm_id_priv)
1291 {
1292         struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv;
1293         struct cm_timewait_info *timewait_info;
1294         struct cm_req_msg *req_msg;
1295         unsigned long flags;
1296
1297         req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1298
1299         /* Check for duplicate REQ and stale connections. */
1300         spin_lock_irqsave(&cm.lock, flags);
1301         timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info);
1302         if (!timewait_info)
1303                 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
1304
1305         if (timewait_info) {
1306                 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
1307                                            timewait_info->work.remote_id);
1308                 spin_unlock_irqrestore(&cm.lock, flags);
1309                 if (cur_cm_id_priv) {
1310                         cm_dup_req_handler(work, cur_cm_id_priv);
1311                         cm_deref_id(cur_cm_id_priv);
1312                 } else
1313                         cm_issue_rej(work->port, work->mad_recv_wc,
1314                                      IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
1315                                      NULL, 0);
1316                 goto error;
1317         }
1318
1319         /* Find matching listen request. */
1320         listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device,
1321                                            req_msg->service_id,
1322                                            req_msg->private_data);
1323         if (!listen_cm_id_priv) {
1324                 spin_unlock_irqrestore(&cm.lock, flags);
1325                 cm_issue_rej(work->port, work->mad_recv_wc,
1326                              IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ,
1327                              NULL, 0);
1328                 goto error;
1329         }
1330         atomic_inc(&listen_cm_id_priv->refcount);
1331         atomic_inc(&cm_id_priv->refcount);
1332         cm_id_priv->id.state = IB_CM_REQ_RCVD;
1333         atomic_inc(&cm_id_priv->work_count);
1334         spin_unlock_irqrestore(&cm.lock, flags);
1335         return listen_cm_id_priv;
1336
1337 error:  cm_cleanup_timewait(cm_id_priv->timewait_info);
1338         return NULL;
1339 }
1340
1341 static int cm_req_handler(struct cm_work *work)
1342 {
1343         struct ib_cm_id *cm_id;
1344         struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
1345         struct cm_req_msg *req_msg;
1346         int ret;
1347
1348         req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1349
1350         cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL);
1351         if (IS_ERR(cm_id))
1352                 return PTR_ERR(cm_id);
1353
1354         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1355         cm_id_priv->id.remote_id = req_msg->local_comm_id;
1356         cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
1357                                 work->mad_recv_wc->recv_buf.grh,
1358                                 &cm_id_priv->av);
1359         cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1360                                                             id.local_id);
1361         if (IS_ERR(cm_id_priv->timewait_info)) {
1362                 ret = PTR_ERR(cm_id_priv->timewait_info);
1363                 goto destroy;
1364         }
1365         cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id;
1366         cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid;
1367         cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg);
1368
1369         listen_cm_id_priv = cm_match_req(work, cm_id_priv);
1370         if (!listen_cm_id_priv) {
1371                 ret = -EINVAL;
1372                 kfree(cm_id_priv->timewait_info);
1373                 goto destroy;
1374         }
1375
1376         cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
1377         cm_id_priv->id.context = listen_cm_id_priv->id.context;
1378         cm_id_priv->id.service_id = req_msg->service_id;
1379         cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL);
1380
1381         cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]);
1382         ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av);
1383         if (ret) {
1384                 ib_get_cached_gid(work->port->cm_dev->device,
1385                                   work->port->port_num, 0, &work->path[0].sgid);
1386                 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID,
1387                                &work->path[0].sgid, sizeof work->path[0].sgid,
1388                                NULL, 0);
1389                 goto rejected;
1390         }
1391         if (req_msg->alt_local_lid) {
1392                 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av);
1393                 if (ret) {
1394                         ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID,
1395                                        &work->path[0].sgid,
1396                                        sizeof work->path[0].sgid, NULL, 0);
1397                         goto rejected;
1398                 }
1399         }
1400         cm_id_priv->tid = req_msg->hdr.tid;
1401         cm_id_priv->timeout_ms = cm_convert_to_ms(
1402                                         cm_req_get_local_resp_timeout(req_msg));
1403         cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg);
1404         cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg);
1405         cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg);
1406         cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg);
1407         cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg);
1408         cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg);
1409         cm_id_priv->local_ack_timeout =
1410                                 cm_req_get_primary_local_ack_timeout(req_msg);
1411         cm_id_priv->retry_count = cm_req_get_retry_count(req_msg);
1412         cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1413         cm_id_priv->qp_type = cm_req_get_qp_type(req_msg);
1414
1415         cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
1416         cm_process_work(cm_id_priv, work);
1417         cm_deref_id(listen_cm_id_priv);
1418         return 0;
1419
1420 rejected:
1421         atomic_dec(&cm_id_priv->refcount);
1422         cm_deref_id(listen_cm_id_priv);
1423 destroy:
1424         ib_destroy_cm_id(cm_id);
1425         return ret;
1426 }
1427
1428 static void cm_format_rep(struct cm_rep_msg *rep_msg,
1429                           struct cm_id_private *cm_id_priv,
1430                           struct ib_cm_rep_param *param)
1431 {
1432         cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid);
1433         rep_msg->local_comm_id = cm_id_priv->id.local_id;
1434         rep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1435         cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num));
1436         cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn));
1437         rep_msg->resp_resources = param->responder_resources;
1438         rep_msg->initiator_depth = param->initiator_depth;
1439         cm_rep_set_target_ack_delay(rep_msg, param->target_ack_delay);
1440         cm_rep_set_failover(rep_msg, param->failover_accepted);
1441         cm_rep_set_flow_ctrl(rep_msg, param->flow_control);
1442         cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count);
1443         cm_rep_set_srq(rep_msg, param->srq);
1444         rep_msg->local_ca_guid = cm_id_priv->av.port->cm_dev->ca_guid;
1445
1446         if (param->private_data && param->private_data_len)
1447                 memcpy(rep_msg->private_data, param->private_data,
1448                        param->private_data_len);
1449 }
1450
1451 int ib_send_cm_rep(struct ib_cm_id *cm_id,
1452                    struct ib_cm_rep_param *param)
1453 {
1454         struct cm_id_private *cm_id_priv;
1455         struct ib_mad_send_buf *msg;
1456         struct cm_rep_msg *rep_msg;
1457         unsigned long flags;
1458         int ret;
1459
1460         if (param->private_data &&
1461             param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE)
1462                 return -EINVAL;
1463
1464         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1465         spin_lock_irqsave(&cm_id_priv->lock, flags);
1466         if (cm_id->state != IB_CM_REQ_RCVD &&
1467             cm_id->state != IB_CM_MRA_REQ_SENT) {
1468                 ret = -EINVAL;
1469                 goto out;
1470         }
1471
1472         ret = cm_alloc_msg(cm_id_priv, &msg);
1473         if (ret)
1474                 goto out;
1475
1476         rep_msg = (struct cm_rep_msg *) msg->mad;
1477         cm_format_rep(rep_msg, cm_id_priv, param);
1478         msg->timeout_ms = cm_id_priv->timeout_ms;
1479         msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;
1480
1481         ret = ib_post_send_mad(msg, NULL);
1482         if (ret) {
1483                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1484                 cm_free_msg(msg);
1485                 return ret;
1486         }
1487
1488         cm_id->state = IB_CM_REP_SENT;
1489         cm_id_priv->msg = msg;
1490         cm_id_priv->initiator_depth = param->initiator_depth;
1491         cm_id_priv->responder_resources = param->responder_resources;
1492         cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg);
1493         cm_id_priv->local_qpn = cm_rep_get_local_qpn(rep_msg);
1494
1495 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1496         return ret;
1497 }
1498 EXPORT_SYMBOL(ib_send_cm_rep);
1499
1500 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg,
1501                           struct cm_id_private *cm_id_priv,
1502                           const void *private_data,
1503                           u8 private_data_len)
1504 {
1505         cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid);
1506         rtu_msg->local_comm_id = cm_id_priv->id.local_id;
1507         rtu_msg->remote_comm_id = cm_id_priv->id.remote_id;
1508
1509         if (private_data && private_data_len)
1510                 memcpy(rtu_msg->private_data, private_data, private_data_len);
1511 }
1512
1513 int ib_send_cm_rtu(struct ib_cm_id *cm_id,
1514                    const void *private_data,
1515                    u8 private_data_len)
1516 {
1517         struct cm_id_private *cm_id_priv;
1518         struct ib_mad_send_buf *msg;
1519         unsigned long flags;
1520         void *data;
1521         int ret;
1522
1523         if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE)
1524                 return -EINVAL;
1525
1526         data = cm_copy_private_data(private_data, private_data_len);
1527         if (IS_ERR(data))
1528                 return PTR_ERR(data);
1529
1530         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1531         spin_lock_irqsave(&cm_id_priv->lock, flags);
1532         if (cm_id->state != IB_CM_REP_RCVD &&
1533             cm_id->state != IB_CM_MRA_REP_SENT) {
1534                 ret = -EINVAL;
1535                 goto error;
1536         }
1537
1538         ret = cm_alloc_msg(cm_id_priv, &msg);
1539         if (ret)
1540                 goto error;
1541
1542         cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1543                       private_data, private_data_len);
1544
1545         ret = ib_post_send_mad(msg, NULL);
1546         if (ret) {
1547                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1548                 cm_free_msg(msg);
1549                 kfree(data);
1550                 return ret;
1551         }
1552
1553         cm_id->state = IB_CM_ESTABLISHED;
1554         cm_set_private_data(cm_id_priv, data, private_data_len);
1555         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1556         return 0;
1557
1558 error:  spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1559         kfree(data);
1560         return ret;
1561 }
1562 EXPORT_SYMBOL(ib_send_cm_rtu);
1563
1564 static void cm_format_rep_event(struct cm_work *work)
1565 {
1566         struct cm_rep_msg *rep_msg;
1567         struct ib_cm_rep_event_param *param;
1568
1569         rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1570         param = &work->cm_event.param.rep_rcvd;
1571         param->remote_ca_guid = rep_msg->local_ca_guid;
1572         param->remote_qkey = be32_to_cpu(rep_msg->local_qkey);
1573         param->remote_qpn = be32_to_cpu(cm_rep_get_local_qpn(rep_msg));
1574         param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg));
1575         param->responder_resources = rep_msg->initiator_depth;
1576         param->initiator_depth = rep_msg->resp_resources;
1577         param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
1578         param->failover_accepted = cm_rep_get_failover(rep_msg);
1579         param->flow_control = cm_rep_get_flow_ctrl(rep_msg);
1580         param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1581         param->srq = cm_rep_get_srq(rep_msg);
1582         work->cm_event.private_data = &rep_msg->private_data;
1583 }
1584
1585 static void cm_dup_rep_handler(struct cm_work *work)
1586 {
1587         struct cm_id_private *cm_id_priv;
1588         struct cm_rep_msg *rep_msg;
1589         struct ib_mad_send_buf *msg = NULL;
1590         unsigned long flags;
1591         int ret;
1592
1593         rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad;
1594         cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id,
1595                                    rep_msg->local_comm_id);
1596         if (!cm_id_priv)
1597                 return;
1598
1599         ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1600         if (ret)
1601                 goto deref;
1602
1603         spin_lock_irqsave(&cm_id_priv->lock, flags);
1604         if (cm_id_priv->id.state == IB_CM_ESTABLISHED)
1605                 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1606                               cm_id_priv->private_data,
1607                               cm_id_priv->private_data_len);
1608         else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT)
1609                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1610                               CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout,
1611                               cm_id_priv->private_data,
1612                               cm_id_priv->private_data_len);
1613         else
1614                 goto unlock;
1615         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1616
1617         ret = ib_post_send_mad(msg, NULL);
1618         if (ret)
1619                 goto free;
1620         goto deref;
1621
1622 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1623 free:   cm_free_msg(msg);
1624 deref:  cm_deref_id(cm_id_priv);
1625 }
1626
1627 static int cm_rep_handler(struct cm_work *work)
1628 {
1629         struct cm_id_private *cm_id_priv;
1630         struct cm_rep_msg *rep_msg;
1631         unsigned long flags;
1632         int ret;
1633
1634         rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1635         cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0);
1636         if (!cm_id_priv) {
1637                 cm_dup_rep_handler(work);
1638                 return -EINVAL;
1639         }
1640
1641         cm_format_rep_event(work);
1642
1643         spin_lock_irqsave(&cm_id_priv->lock, flags);
1644         switch (cm_id_priv->id.state) {
1645         case IB_CM_REQ_SENT:
1646         case IB_CM_MRA_REQ_RCVD:
1647                 break;
1648         default:
1649                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1650                 ret = -EINVAL;
1651                 goto error;
1652         }
1653
1654         cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id;
1655         cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid;
1656         cm_id_priv->timewait_info->remote_qpn = cm_rep_get_local_qpn(rep_msg);
1657
1658         spin_lock(&cm.lock);
1659         /* Check for duplicate REP. */
1660         if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
1661                 spin_unlock(&cm.lock);
1662                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1663                 ret = -EINVAL;
1664                 goto error;
1665         }
1666         /* Check for a stale connection. */
1667         if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) {
1668                 rb_erase(&cm_id_priv->timewait_info->remote_id_node,
1669                          &cm.remote_id_table);
1670                 cm_id_priv->timewait_info->inserted_remote_id = 0;
1671                 spin_unlock(&cm.lock);
1672                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1673                 cm_issue_rej(work->port, work->mad_recv_wc,
1674                              IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP,
1675                              NULL, 0);
1676                 ret = -EINVAL;
1677                 goto error;
1678         }
1679         spin_unlock(&cm.lock);
1680
1681         cm_id_priv->id.state = IB_CM_REP_RCVD;
1682         cm_id_priv->id.remote_id = rep_msg->local_comm_id;
1683         cm_id_priv->remote_qpn = cm_rep_get_local_qpn(rep_msg);
1684         cm_id_priv->initiator_depth = rep_msg->resp_resources;
1685         cm_id_priv->responder_resources = rep_msg->initiator_depth;
1686         cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg);
1687         cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1688
1689         /* todo: handle peer_to_peer */
1690
1691         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1692         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1693         if (!ret)
1694                 list_add_tail(&work->list, &cm_id_priv->work_list);
1695         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1696
1697         if (ret)
1698                 cm_process_work(cm_id_priv, work);
1699         else
1700                 cm_deref_id(cm_id_priv);
1701         return 0;
1702
1703 error:
1704         cm_deref_id(cm_id_priv);
1705         return ret;
1706 }
1707
1708 static int cm_establish_handler(struct cm_work *work)
1709 {
1710         struct cm_id_private *cm_id_priv;
1711         unsigned long flags;
1712         int ret;
1713
1714         /* See comment in ib_cm_establish about lookup. */
1715         cm_id_priv = cm_acquire_id(work->local_id, work->remote_id);
1716         if (!cm_id_priv)
1717                 return -EINVAL;
1718
1719         spin_lock_irqsave(&cm_id_priv->lock, flags);
1720         if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
1721                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1722                 goto out;
1723         }
1724
1725         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1726         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1727         if (!ret)
1728                 list_add_tail(&work->list, &cm_id_priv->work_list);
1729         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1730
1731         if (ret)
1732                 cm_process_work(cm_id_priv, work);
1733         else
1734                 cm_deref_id(cm_id_priv);
1735         return 0;
1736 out:
1737         cm_deref_id(cm_id_priv);
1738         return -EINVAL;
1739 }
1740
1741 static int cm_rtu_handler(struct cm_work *work)
1742 {
1743         struct cm_id_private *cm_id_priv;
1744         struct cm_rtu_msg *rtu_msg;
1745         unsigned long flags;
1746         int ret;
1747
1748         rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad;
1749         cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id,
1750                                    rtu_msg->local_comm_id);
1751         if (!cm_id_priv)
1752                 return -EINVAL;
1753
1754         work->cm_event.private_data = &rtu_msg->private_data;
1755
1756         spin_lock_irqsave(&cm_id_priv->lock, flags);
1757         if (cm_id_priv->id.state != IB_CM_REP_SENT &&
1758             cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
1759                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1760                 goto out;
1761         }
1762         cm_id_priv->id.state = IB_CM_ESTABLISHED;
1763
1764         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1765         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1766         if (!ret)
1767                 list_add_tail(&work->list, &cm_id_priv->work_list);
1768         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1769
1770         if (ret)
1771                 cm_process_work(cm_id_priv, work);
1772         else
1773                 cm_deref_id(cm_id_priv);
1774         return 0;
1775 out:
1776         cm_deref_id(cm_id_priv);
1777         return -EINVAL;
1778 }
1779
1780 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg,
1781                           struct cm_id_private *cm_id_priv,
1782                           const void *private_data,
1783                           u8 private_data_len)
1784 {
1785         cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID,
1786                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ));
1787         dreq_msg->local_comm_id = cm_id_priv->id.local_id;
1788         dreq_msg->remote_comm_id = cm_id_priv->id.remote_id;
1789         cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn);
1790
1791         if (private_data && private_data_len)
1792                 memcpy(dreq_msg->private_data, private_data, private_data_len);
1793 }
1794
1795 int ib_send_cm_dreq(struct ib_cm_id *cm_id,
1796                     const void *private_data,
1797                     u8 private_data_len)
1798 {
1799         struct cm_id_private *cm_id_priv;
1800         struct ib_mad_send_buf *msg;
1801         unsigned long flags;
1802         int ret;
1803
1804         if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE)
1805                 return -EINVAL;
1806
1807         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1808         spin_lock_irqsave(&cm_id_priv->lock, flags);
1809         if (cm_id->state != IB_CM_ESTABLISHED) {
1810                 ret = -EINVAL;
1811                 goto out;
1812         }
1813
1814         ret = cm_alloc_msg(cm_id_priv, &msg);
1815         if (ret) {
1816                 cm_enter_timewait(cm_id_priv);
1817                 goto out;
1818         }
1819
1820         cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv,
1821                        private_data, private_data_len);
1822         msg->timeout_ms = cm_id_priv->timeout_ms;
1823         msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
1824
1825         ret = ib_post_send_mad(msg, NULL);
1826         if (ret) {
1827                 cm_enter_timewait(cm_id_priv);
1828                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1829                 cm_free_msg(msg);
1830                 return ret;
1831         }
1832
1833         cm_id->state = IB_CM_DREQ_SENT;
1834         cm_id_priv->msg = msg;
1835 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1836         return ret;
1837 }
1838 EXPORT_SYMBOL(ib_send_cm_dreq);
1839
1840 static void cm_format_drep(struct cm_drep_msg *drep_msg,
1841                           struct cm_id_private *cm_id_priv,
1842                           const void *private_data,
1843                           u8 private_data_len)
1844 {
1845         cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid);
1846         drep_msg->local_comm_id = cm_id_priv->id.local_id;
1847         drep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1848
1849         if (private_data && private_data_len)
1850                 memcpy(drep_msg->private_data, private_data, private_data_len);
1851 }
1852
1853 int ib_send_cm_drep(struct ib_cm_id *cm_id,
1854                     const void *private_data,
1855                     u8 private_data_len)
1856 {
1857         struct cm_id_private *cm_id_priv;
1858         struct ib_mad_send_buf *msg;
1859         unsigned long flags;
1860         void *data;
1861         int ret;
1862
1863         if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
1864                 return -EINVAL;
1865
1866         data = cm_copy_private_data(private_data, private_data_len);
1867         if (IS_ERR(data))
1868                 return PTR_ERR(data);
1869
1870         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1871         spin_lock_irqsave(&cm_id_priv->lock, flags);
1872         if (cm_id->state != IB_CM_DREQ_RCVD) {
1873                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1874                 kfree(data);
1875                 return -EINVAL;
1876         }
1877
1878         cm_set_private_data(cm_id_priv, data, private_data_len);
1879         cm_enter_timewait(cm_id_priv);
1880
1881         ret = cm_alloc_msg(cm_id_priv, &msg);
1882         if (ret)
1883                 goto out;
1884
1885         cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
1886                        private_data, private_data_len);
1887
1888         ret = ib_post_send_mad(msg, NULL);
1889         if (ret) {
1890                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1891                 cm_free_msg(msg);
1892                 return ret;
1893         }
1894
1895 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1896         return ret;
1897 }
1898 EXPORT_SYMBOL(ib_send_cm_drep);
1899
1900 static int cm_dreq_handler(struct cm_work *work)
1901 {
1902         struct cm_id_private *cm_id_priv;
1903         struct cm_dreq_msg *dreq_msg;
1904         struct ib_mad_send_buf *msg = NULL;
1905         unsigned long flags;
1906         int ret;
1907
1908         dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
1909         cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id,
1910                                    dreq_msg->local_comm_id);
1911         if (!cm_id_priv)
1912                 return -EINVAL;
1913
1914         work->cm_event.private_data = &dreq_msg->private_data;
1915
1916         spin_lock_irqsave(&cm_id_priv->lock, flags);
1917         if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg))
1918                 goto unlock;
1919
1920         switch (cm_id_priv->id.state) {
1921         case IB_CM_REP_SENT:
1922         case IB_CM_DREQ_SENT:
1923                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1924                 break;
1925         case IB_CM_ESTABLISHED:
1926         case IB_CM_MRA_REP_RCVD:
1927                 break;
1928         case IB_CM_TIMEWAIT:
1929                 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
1930                         goto unlock;
1931
1932                 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
1933                                cm_id_priv->private_data,
1934                                cm_id_priv->private_data_len);
1935                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1936
1937                 if (ib_post_send_mad(msg, NULL))
1938                         cm_free_msg(msg);
1939                 goto deref;
1940         default:
1941                 goto unlock;
1942         }
1943         cm_id_priv->id.state = IB_CM_DREQ_RCVD;
1944         cm_id_priv->tid = dreq_msg->hdr.tid;
1945         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1946         if (!ret)
1947                 list_add_tail(&work->list, &cm_id_priv->work_list);
1948         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1949
1950         if (ret)
1951                 cm_process_work(cm_id_priv, work);
1952         else
1953                 cm_deref_id(cm_id_priv);
1954         return 0;
1955
1956 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1957 deref:  cm_deref_id(cm_id_priv);
1958         return -EINVAL;
1959 }
1960
1961 static int cm_drep_handler(struct cm_work *work)
1962 {
1963         struct cm_id_private *cm_id_priv;
1964         struct cm_drep_msg *drep_msg;
1965         unsigned long flags;
1966         int ret;
1967
1968         drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
1969         cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id,
1970                                    drep_msg->local_comm_id);
1971         if (!cm_id_priv)
1972                 return -EINVAL;
1973
1974         work->cm_event.private_data = &drep_msg->private_data;
1975
1976         spin_lock_irqsave(&cm_id_priv->lock, flags);
1977         if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
1978             cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
1979                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1980                 goto out;
1981         }
1982         cm_enter_timewait(cm_id_priv);
1983
1984         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1985         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1986         if (!ret)
1987                 list_add_tail(&work->list, &cm_id_priv->work_list);
1988         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1989
1990         if (ret)
1991                 cm_process_work(cm_id_priv, work);
1992         else
1993                 cm_deref_id(cm_id_priv);
1994         return 0;
1995 out:
1996         cm_deref_id(cm_id_priv);
1997         return -EINVAL;
1998 }
1999
2000 int ib_send_cm_rej(struct ib_cm_id *cm_id,
2001                    enum ib_cm_rej_reason reason,
2002                    void *ari,
2003                    u8 ari_length,
2004                    const void *private_data,
2005                    u8 private_data_len)
2006 {
2007         struct cm_id_private *cm_id_priv;
2008         struct ib_mad_send_buf *msg;
2009         unsigned long flags;
2010         int ret;
2011
2012         if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
2013             (ari && ari_length > IB_CM_REJ_ARI_LENGTH))
2014                 return -EINVAL;
2015
2016         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2017
2018         spin_lock_irqsave(&cm_id_priv->lock, flags);
2019         switch (cm_id->state) {
2020         case IB_CM_REQ_SENT:
2021         case IB_CM_MRA_REQ_RCVD:
2022         case IB_CM_REQ_RCVD:
2023         case IB_CM_MRA_REQ_SENT:
2024         case IB_CM_REP_RCVD:
2025         case IB_CM_MRA_REP_SENT:
2026                 ret = cm_alloc_msg(cm_id_priv, &msg);
2027                 if (!ret)
2028                         cm_format_rej((struct cm_rej_msg *) msg->mad,
2029                                       cm_id_priv, reason, ari, ari_length,
2030                                       private_data, private_data_len);
2031
2032                 cm_reset_to_idle(cm_id_priv);
2033                 break;
2034         case IB_CM_REP_SENT:
2035         case IB_CM_MRA_REP_RCVD:
2036                 ret = cm_alloc_msg(cm_id_priv, &msg);
2037                 if (!ret)
2038                         cm_format_rej((struct cm_rej_msg *) msg->mad,
2039                                       cm_id_priv, reason, ari, ari_length,
2040                                       private_data, private_data_len);
2041
2042                 cm_enter_timewait(cm_id_priv);
2043                 break;
2044         default:
2045                 ret = -EINVAL;
2046                 goto out;
2047         }
2048
2049         if (ret)
2050                 goto out;
2051
2052         ret = ib_post_send_mad(msg, NULL);
2053         if (ret)
2054                 cm_free_msg(msg);
2055
2056 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2057         return ret;
2058 }
2059 EXPORT_SYMBOL(ib_send_cm_rej);
2060
2061 static void cm_format_rej_event(struct cm_work *work)
2062 {
2063         struct cm_rej_msg *rej_msg;
2064         struct ib_cm_rej_event_param *param;
2065
2066         rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2067         param = &work->cm_event.param.rej_rcvd;
2068         param->ari = rej_msg->ari;
2069         param->ari_length = cm_rej_get_reject_info_len(rej_msg);
2070         param->reason = __be16_to_cpu(rej_msg->reason);
2071         work->cm_event.private_data = &rej_msg->private_data;
2072 }
2073
2074 static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
2075 {
2076         struct cm_timewait_info *timewait_info;
2077         struct cm_id_private *cm_id_priv;
2078         unsigned long flags;
2079         __be32 remote_id;
2080
2081         remote_id = rej_msg->local_comm_id;
2082
2083         if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) {
2084                 spin_lock_irqsave(&cm.lock, flags);
2085                 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari),
2086                                                   remote_id);
2087                 if (!timewait_info) {
2088                         spin_unlock_irqrestore(&cm.lock, flags);
2089                         return NULL;
2090                 }
2091                 cm_id_priv = idr_find(&cm.local_id_table, (__force int)
2092                                       (timewait_info->work.local_id ^
2093                                        cm.random_id_operand));
2094                 if (cm_id_priv) {
2095                         if (cm_id_priv->id.remote_id == remote_id)
2096                                 atomic_inc(&cm_id_priv->refcount);
2097                         else
2098                                 cm_id_priv = NULL;
2099                 }
2100                 spin_unlock_irqrestore(&cm.lock, flags);
2101         } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ)
2102                 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0);
2103         else
2104                 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id);
2105
2106         return cm_id_priv;
2107 }
2108
2109 static int cm_rej_handler(struct cm_work *work)
2110 {
2111         struct cm_id_private *cm_id_priv;
2112         struct cm_rej_msg *rej_msg;
2113         unsigned long flags;
2114         int ret;
2115
2116         rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2117         cm_id_priv = cm_acquire_rejected_id(rej_msg);
2118         if (!cm_id_priv)
2119                 return -EINVAL;
2120
2121         cm_format_rej_event(work);
2122
2123         spin_lock_irqsave(&cm_id_priv->lock, flags);
2124         switch (cm_id_priv->id.state) {
2125         case IB_CM_REQ_SENT:
2126         case IB_CM_MRA_REQ_RCVD:
2127         case IB_CM_REP_SENT:
2128         case IB_CM_MRA_REP_RCVD:
2129                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2130                 /* fall through */
2131         case IB_CM_REQ_RCVD:
2132         case IB_CM_MRA_REQ_SENT:
2133                 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN)
2134                         cm_enter_timewait(cm_id_priv);
2135                 else
2136                         cm_reset_to_idle(cm_id_priv);
2137                 break;
2138         case IB_CM_DREQ_SENT:
2139                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2140                 /* fall through */
2141         case IB_CM_REP_RCVD:
2142         case IB_CM_MRA_REP_SENT:
2143         case IB_CM_ESTABLISHED:
2144                 cm_enter_timewait(cm_id_priv);
2145                 break;
2146         default:
2147                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2148                 ret = -EINVAL;
2149                 goto out;
2150         }
2151
2152         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2153         if (!ret)
2154                 list_add_tail(&work->list, &cm_id_priv->work_list);
2155         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2156
2157         if (ret)
2158                 cm_process_work(cm_id_priv, work);
2159         else
2160                 cm_deref_id(cm_id_priv);
2161         return 0;
2162 out:
2163         cm_deref_id(cm_id_priv);
2164         return -EINVAL;
2165 }
2166
2167 int ib_send_cm_mra(struct ib_cm_id *cm_id,
2168                    u8 service_timeout,
2169                    const void *private_data,
2170                    u8 private_data_len)
2171 {
2172         struct cm_id_private *cm_id_priv;
2173         struct ib_mad_send_buf *msg;
2174         void *data;
2175         unsigned long flags;
2176         int ret;
2177
2178         if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE)
2179                 return -EINVAL;
2180
2181         data = cm_copy_private_data(private_data, private_data_len);
2182         if (IS_ERR(data))
2183                 return PTR_ERR(data);
2184
2185         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2186
2187         spin_lock_irqsave(&cm_id_priv->lock, flags);
2188         switch(cm_id_priv->id.state) {
2189         case IB_CM_REQ_RCVD:
2190                 ret = cm_alloc_msg(cm_id_priv, &msg);
2191                 if (ret)
2192                         goto error1;
2193
2194                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2195                               CM_MSG_RESPONSE_REQ, service_timeout,
2196                               private_data, private_data_len);
2197                 ret = ib_post_send_mad(msg, NULL);
2198                 if (ret)
2199                         goto error2;
2200                 cm_id->state = IB_CM_MRA_REQ_SENT;
2201                 break;
2202         case IB_CM_REP_RCVD:
2203                 ret = cm_alloc_msg(cm_id_priv, &msg);
2204                 if (ret)
2205                         goto error1;
2206
2207                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2208                               CM_MSG_RESPONSE_REP, service_timeout,
2209                               private_data, private_data_len);
2210                 ret = ib_post_send_mad(msg, NULL);
2211                 if (ret)
2212                         goto error2;
2213                 cm_id->state = IB_CM_MRA_REP_SENT;
2214                 break;
2215         case IB_CM_ESTABLISHED:
2216                 ret = cm_alloc_msg(cm_id_priv, &msg);
2217                 if (ret)
2218                         goto error1;
2219
2220                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2221                               CM_MSG_RESPONSE_OTHER, service_timeout,
2222                               private_data, private_data_len);
2223                 ret = ib_post_send_mad(msg, NULL);
2224                 if (ret)
2225                         goto error2;
2226                 cm_id->lap_state = IB_CM_MRA_LAP_SENT;
2227                 break;
2228         default:
2229                 ret = -EINVAL;
2230                 goto error1;
2231         }
2232         cm_id_priv->service_timeout = service_timeout;
2233         cm_set_private_data(cm_id_priv, data, private_data_len);
2234         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2235         return 0;
2236
2237 error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2238         kfree(data);
2239         return ret;
2240
2241 error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2242         kfree(data);
2243         cm_free_msg(msg);
2244         return ret;
2245 }
2246 EXPORT_SYMBOL(ib_send_cm_mra);
2247
2248 static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
2249 {
2250         switch (cm_mra_get_msg_mraed(mra_msg)) {
2251         case CM_MSG_RESPONSE_REQ:
2252                 return cm_acquire_id(mra_msg->remote_comm_id, 0);
2253         case CM_MSG_RESPONSE_REP:
2254         case CM_MSG_RESPONSE_OTHER:
2255                 return cm_acquire_id(mra_msg->remote_comm_id,
2256                                      mra_msg->local_comm_id);
2257         default:
2258                 return NULL;
2259         }
2260 }
2261
2262 static int cm_mra_handler(struct cm_work *work)
2263 {
2264         struct cm_id_private *cm_id_priv;
2265         struct cm_mra_msg *mra_msg;
2266         unsigned long flags;
2267         int timeout, ret;
2268
2269         mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
2270         cm_id_priv = cm_acquire_mraed_id(mra_msg);
2271         if (!cm_id_priv)
2272                 return -EINVAL;
2273
2274         work->cm_event.private_data = &mra_msg->private_data;
2275         work->cm_event.param.mra_rcvd.service_timeout =
2276                                         cm_mra_get_service_timeout(mra_msg);
2277         timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) +
2278                   cm_convert_to_ms(cm_id_priv->av.packet_life_time);
2279
2280         spin_lock_irqsave(&cm_id_priv->lock, flags);
2281         switch (cm_id_priv->id.state) {
2282         case IB_CM_REQ_SENT:
2283                 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ ||
2284                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
2285                                   cm_id_priv->msg, timeout))
2286                         goto out;
2287                 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
2288                 break;
2289         case IB_CM_REP_SENT:
2290                 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP ||
2291                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
2292                                   cm_id_priv->msg, timeout))
2293                         goto out;
2294                 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
2295                 break;
2296         case IB_CM_ESTABLISHED:
2297                 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER ||
2298                     cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
2299                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
2300                                   cm_id_priv->msg, timeout))
2301                         goto out;
2302                 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
2303                 break;
2304         default:
2305                 goto out;
2306         }
2307
2308         cm_id_priv->msg->context[1] = (void *) (unsigned long)
2309                                       cm_id_priv->id.state;
2310         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2311         if (!ret)
2312                 list_add_tail(&work->list, &cm_id_priv->work_list);
2313         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2314
2315         if (ret)
2316                 cm_process_work(cm_id_priv, work);
2317         else
2318                 cm_deref_id(cm_id_priv);
2319         return 0;
2320 out:
2321         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2322         cm_deref_id(cm_id_priv);
2323         return -EINVAL;
2324 }
2325
2326 static void cm_format_lap(struct cm_lap_msg *lap_msg,
2327                           struct cm_id_private *cm_id_priv,
2328                           struct ib_sa_path_rec *alternate_path,
2329                           const void *private_data,
2330                           u8 private_data_len)
2331 {
2332         cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID,
2333                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP));
2334         lap_msg->local_comm_id = cm_id_priv->id.local_id;
2335         lap_msg->remote_comm_id = cm_id_priv->id.remote_id;
2336         cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn);
2337         /* todo: need remote CM response timeout */
2338         cm_lap_set_remote_resp_timeout(lap_msg, 0x1F);
2339         lap_msg->alt_local_lid = alternate_path->slid;
2340         lap_msg->alt_remote_lid = alternate_path->dlid;
2341         lap_msg->alt_local_gid = alternate_path->sgid;
2342         lap_msg->alt_remote_gid = alternate_path->dgid;
2343         cm_lap_set_flow_label(lap_msg, alternate_path->flow_label);
2344         cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class);
2345         lap_msg->alt_hop_limit = alternate_path->hop_limit;
2346         cm_lap_set_packet_rate(lap_msg, alternate_path->rate);
2347         cm_lap_set_sl(lap_msg, alternate_path->sl);
2348         cm_lap_set_subnet_local(lap_msg, 1); /* local only... */
2349         cm_lap_set_local_ack_timeout(lap_msg,
2350                 min(31, alternate_path->packet_life_time + 1));
2351
2352         if (private_data && private_data_len)
2353                 memcpy(lap_msg->private_data, private_data, private_data_len);
2354 }
2355
2356 int ib_send_cm_lap(struct ib_cm_id *cm_id,
2357                    struct ib_sa_path_rec *alternate_path,
2358                    const void *private_data,
2359                    u8 private_data_len)
2360 {
2361         struct cm_id_private *cm_id_priv;
2362         struct ib_mad_send_buf *msg;
2363         unsigned long flags;
2364         int ret;
2365
2366         if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE)
2367                 return -EINVAL;
2368
2369         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2370         spin_lock_irqsave(&cm_id_priv->lock, flags);
2371         if (cm_id->state != IB_CM_ESTABLISHED ||
2372             cm_id->lap_state != IB_CM_LAP_IDLE) {
2373                 ret = -EINVAL;
2374                 goto out;
2375         }
2376
2377         ret = cm_alloc_msg(cm_id_priv, &msg);
2378         if (ret)
2379                 goto out;
2380
2381         cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv,
2382                       alternate_path, private_data, private_data_len);
2383         msg->timeout_ms = cm_id_priv->timeout_ms;
2384         msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED;
2385
2386         ret = ib_post_send_mad(msg, NULL);
2387         if (ret) {
2388                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2389                 cm_free_msg(msg);
2390                 return ret;
2391         }
2392
2393         cm_id->lap_state = IB_CM_LAP_SENT;
2394         cm_id_priv->msg = msg;
2395
2396 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2397         return ret;
2398 }
2399 EXPORT_SYMBOL(ib_send_cm_lap);
2400
2401 static void cm_format_path_from_lap(struct ib_sa_path_rec *path,
2402                                     struct cm_lap_msg *lap_msg)
2403 {
2404         memset(path, 0, sizeof *path);
2405         path->dgid = lap_msg->alt_local_gid;
2406         path->sgid = lap_msg->alt_remote_gid;
2407         path->dlid = lap_msg->alt_local_lid;
2408         path->slid = lap_msg->alt_remote_lid;
2409         path->flow_label = cm_lap_get_flow_label(lap_msg);
2410         path->hop_limit = lap_msg->alt_hop_limit;
2411         path->traffic_class = cm_lap_get_traffic_class(lap_msg);
2412         path->reversible = 1;
2413         /* pkey is same as in REQ */
2414         path->sl = cm_lap_get_sl(lap_msg);
2415         path->mtu_selector = IB_SA_EQ;
2416         /* mtu is same as in REQ */
2417         path->rate_selector = IB_SA_EQ;
2418         path->rate = cm_lap_get_packet_rate(lap_msg);
2419         path->packet_life_time_selector = IB_SA_EQ;
2420         path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg);
2421         path->packet_life_time -= (path->packet_life_time > 0);
2422 }
2423
2424 static int cm_lap_handler(struct cm_work *work)
2425 {
2426         struct cm_id_private *cm_id_priv;
2427         struct cm_lap_msg *lap_msg;
2428         struct ib_cm_lap_event_param *param;
2429         struct ib_mad_send_buf *msg = NULL;
2430         unsigned long flags;
2431         int ret;
2432
2433         /* todo: verify LAP request and send reject APR if invalid. */
2434         lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
2435         cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id,
2436                                    lap_msg->local_comm_id);
2437         if (!cm_id_priv)
2438                 return -EINVAL;
2439
2440         param = &work->cm_event.param.lap_rcvd;
2441         param->alternate_path = &work->path[0];
2442         cm_format_path_from_lap(param->alternate_path, lap_msg);
2443         work->cm_event.private_data = &lap_msg->private_data;
2444
2445         spin_lock_irqsave(&cm_id_priv->lock, flags);
2446         if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
2447                 goto unlock;
2448
2449         switch (cm_id_priv->id.lap_state) {
2450         case IB_CM_LAP_IDLE:
2451                 break;
2452         case IB_CM_MRA_LAP_SENT:
2453                 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2454                         goto unlock;
2455
2456                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2457                               CM_MSG_RESPONSE_OTHER,
2458                               cm_id_priv->service_timeout,
2459                               cm_id_priv->private_data,
2460                               cm_id_priv->private_data_len);
2461                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2462
2463                 if (ib_post_send_mad(msg, NULL))
2464                         cm_free_msg(msg);
2465                 goto deref;
2466         default:
2467                 goto unlock;
2468         }
2469
2470         cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
2471         cm_id_priv->tid = lap_msg->hdr.tid;
2472         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2473         if (!ret)
2474                 list_add_tail(&work->list, &cm_id_priv->work_list);
2475         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2476
2477         if (ret)
2478                 cm_process_work(cm_id_priv, work);
2479         else
2480                 cm_deref_id(cm_id_priv);
2481         return 0;
2482
2483 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2484 deref:  cm_deref_id(cm_id_priv);
2485         return -EINVAL;
2486 }
2487
2488 static void cm_format_apr(struct cm_apr_msg *apr_msg,
2489                           struct cm_id_private *cm_id_priv,
2490                           enum ib_cm_apr_status status,
2491                           void *info,
2492                           u8 info_length,
2493                           const void *private_data,
2494                           u8 private_data_len)
2495 {
2496         cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid);
2497         apr_msg->local_comm_id = cm_id_priv->id.local_id;
2498         apr_msg->remote_comm_id = cm_id_priv->id.remote_id;
2499         apr_msg->ap_status = (u8) status;
2500
2501         if (info && info_length) {
2502                 apr_msg->info_length = info_length;
2503                 memcpy(apr_msg->info, info, info_length);
2504         }
2505
2506         if (private_data && private_data_len)
2507                 memcpy(apr_msg->private_data, private_data, private_data_len);
2508 }
2509
2510 int ib_send_cm_apr(struct ib_cm_id *cm_id,
2511                    enum ib_cm_apr_status status,
2512                    void *info,
2513                    u8 info_length,
2514                    const void *private_data,
2515                    u8 private_data_len)
2516 {
2517         struct cm_id_private *cm_id_priv;
2518         struct ib_mad_send_buf *msg;
2519         unsigned long flags;
2520         int ret;
2521
2522         if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) ||
2523             (info && info_length > IB_CM_APR_INFO_LENGTH))
2524                 return -EINVAL;
2525
2526         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2527         spin_lock_irqsave(&cm_id_priv->lock, flags);
2528         if (cm_id->state != IB_CM_ESTABLISHED ||
2529             (cm_id->lap_state != IB_CM_LAP_RCVD &&
2530              cm_id->lap_state != IB_CM_MRA_LAP_SENT)) {
2531                 ret = -EINVAL;
2532                 goto out;
2533         }
2534
2535         ret = cm_alloc_msg(cm_id_priv, &msg);
2536         if (ret)
2537                 goto out;
2538
2539         cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status,
2540                       info, info_length, private_data, private_data_len);
2541         ret = ib_post_send_mad(msg, NULL);
2542         if (ret) {
2543                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2544                 cm_free_msg(msg);
2545                 return ret;
2546         }
2547
2548         cm_id->lap_state = IB_CM_LAP_IDLE;
2549 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2550         return ret;
2551 }
2552 EXPORT_SYMBOL(ib_send_cm_apr);
2553
2554 static int cm_apr_handler(struct cm_work *work)
2555 {
2556         struct cm_id_private *cm_id_priv;
2557         struct cm_apr_msg *apr_msg;
2558         unsigned long flags;
2559         int ret;
2560
2561         apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
2562         cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id,
2563                                    apr_msg->local_comm_id);
2564         if (!cm_id_priv)
2565                 return -EINVAL; /* Unmatched reply. */
2566
2567         work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status;
2568         work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info;
2569         work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length;
2570         work->cm_event.private_data = &apr_msg->private_data;
2571
2572         spin_lock_irqsave(&cm_id_priv->lock, flags);
2573         if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
2574             (cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
2575              cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
2576                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2577                 goto out;
2578         }
2579         cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
2580         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2581         cm_id_priv->msg = NULL;
2582
2583         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2584         if (!ret)
2585                 list_add_tail(&work->list, &cm_id_priv->work_list);
2586         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2587
2588         if (ret)
2589                 cm_process_work(cm_id_priv, work);
2590         else
2591                 cm_deref_id(cm_id_priv);
2592         return 0;
2593 out:
2594         cm_deref_id(cm_id_priv);
2595         return -EINVAL;
2596 }
2597
2598 static int cm_timewait_handler(struct cm_work *work)
2599 {
2600         struct cm_timewait_info *timewait_info;
2601         struct cm_id_private *cm_id_priv;
2602         unsigned long flags;
2603         int ret;
2604
2605         timewait_info = (struct cm_timewait_info *)work;
2606         cm_cleanup_timewait(timewait_info);
2607
2608         cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
2609                                    timewait_info->work.remote_id);
2610         if (!cm_id_priv)
2611                 return -EINVAL;
2612
2613         spin_lock_irqsave(&cm_id_priv->lock, flags);
2614         if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
2615             cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
2616                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2617                 goto out;
2618         }
2619         cm_id_priv->id.state = IB_CM_IDLE;
2620         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2621         if (!ret)
2622                 list_add_tail(&work->list, &cm_id_priv->work_list);
2623         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2624
2625         if (ret)
2626                 cm_process_work(cm_id_priv, work);
2627         else
2628                 cm_deref_id(cm_id_priv);
2629         return 0;
2630 out:
2631         cm_deref_id(cm_id_priv);
2632         return -EINVAL;
2633 }
2634
2635 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
2636                                struct cm_id_private *cm_id_priv,
2637                                struct ib_cm_sidr_req_param *param)
2638 {
2639         cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
2640                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR));
2641         sidr_req_msg->request_id = cm_id_priv->id.local_id;
2642         sidr_req_msg->pkey = cpu_to_be16(param->path->pkey);
2643         sidr_req_msg->service_id = param->service_id;
2644
2645         if (param->private_data && param->private_data_len)
2646                 memcpy(sidr_req_msg->private_data, param->private_data,
2647                        param->private_data_len);
2648 }
2649
2650 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
2651                         struct ib_cm_sidr_req_param *param)
2652 {
2653         struct cm_id_private *cm_id_priv;
2654         struct ib_mad_send_buf *msg;
2655         unsigned long flags;
2656         int ret;
2657
2658         if (!param->path || (param->private_data &&
2659              param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
2660                 return -EINVAL;
2661
2662         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2663         ret = cm_init_av_by_path(param->path, &cm_id_priv->av);
2664         if (ret)
2665                 goto out;
2666
2667         cm_id->service_id = param->service_id;
2668         cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
2669         cm_id_priv->timeout_ms = param->timeout_ms;
2670         cm_id_priv->max_cm_retries = param->max_cm_retries;
2671         ret = cm_alloc_msg(cm_id_priv, &msg);
2672         if (ret)
2673                 goto out;
2674
2675         cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv,
2676                            param);
2677         msg->timeout_ms = cm_id_priv->timeout_ms;
2678         msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT;
2679
2680         spin_lock_irqsave(&cm_id_priv->lock, flags);
2681         if (cm_id->state == IB_CM_IDLE)
2682                 ret = ib_post_send_mad(msg, NULL);
2683         else
2684                 ret = -EINVAL;
2685
2686         if (ret) {
2687                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2688                 cm_free_msg(msg);
2689                 goto out;
2690         }
2691         cm_id->state = IB_CM_SIDR_REQ_SENT;
2692         cm_id_priv->msg = msg;
2693         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2694 out:
2695         return ret;
2696 }
2697 EXPORT_SYMBOL(ib_send_cm_sidr_req);
2698
2699 static void cm_format_sidr_req_event(struct cm_work *work,
2700                                      struct ib_cm_id *listen_id)
2701 {
2702         struct cm_sidr_req_msg *sidr_req_msg;
2703         struct ib_cm_sidr_req_event_param *param;
2704
2705         sidr_req_msg = (struct cm_sidr_req_msg *)
2706                                 work->mad_recv_wc->recv_buf.mad;
2707         param = &work->cm_event.param.sidr_req_rcvd;
2708         param->pkey = __be16_to_cpu(sidr_req_msg->pkey);
2709         param->listen_id = listen_id;
2710         param->port = work->port->port_num;
2711         work->cm_event.private_data = &sidr_req_msg->private_data;
2712 }
2713
2714 static int cm_sidr_req_handler(struct cm_work *work)
2715 {
2716         struct ib_cm_id *cm_id;
2717         struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
2718         struct cm_sidr_req_msg *sidr_req_msg;
2719         struct ib_wc *wc;
2720         unsigned long flags;
2721
2722         cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL);
2723         if (IS_ERR(cm_id))
2724                 return PTR_ERR(cm_id);
2725         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2726
2727         /* Record SGID/SLID and request ID for lookup. */
2728         sidr_req_msg = (struct cm_sidr_req_msg *)
2729                                 work->mad_recv_wc->recv_buf.mad;
2730         wc = work->mad_recv_wc->wc;
2731         cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid);
2732         cm_id_priv->av.dgid.global.interface_id = 0;
2733         cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2734                                 work->mad_recv_wc->recv_buf.grh,
2735                                 &cm_id_priv->av);
2736         cm_id_priv->id.remote_id = sidr_req_msg->request_id;
2737         cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
2738         cm_id_priv->tid = sidr_req_msg->hdr.tid;
2739         atomic_inc(&cm_id_priv->work_count);
2740
2741         spin_lock_irqsave(&cm.lock, flags);
2742         cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
2743         if (cur_cm_id_priv) {
2744                 spin_unlock_irqrestore(&cm.lock, flags);
2745                 goto out; /* Duplicate message. */
2746         }
2747         cur_cm_id_priv = cm_find_listen(cm_id->device,
2748                                         sidr_req_msg->service_id,
2749                                         sidr_req_msg->private_data);
2750         if (!cur_cm_id_priv) {
2751                 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
2752                 spin_unlock_irqrestore(&cm.lock, flags);
2753                 /* todo: reply with no match */
2754                 goto out; /* No match. */
2755         }
2756         atomic_inc(&cur_cm_id_priv->refcount);
2757         spin_unlock_irqrestore(&cm.lock, flags);
2758
2759         cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler;
2760         cm_id_priv->id.context = cur_cm_id_priv->id.context;
2761         cm_id_priv->id.service_id = sidr_req_msg->service_id;
2762         cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL);
2763
2764         cm_format_sidr_req_event(work, &cur_cm_id_priv->id);
2765         cm_process_work(cm_id_priv, work);
2766         cm_deref_id(cur_cm_id_priv);
2767         return 0;
2768 out:
2769         ib_destroy_cm_id(&cm_id_priv->id);
2770         return -EINVAL;
2771 }
2772
2773 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
2774                                struct cm_id_private *cm_id_priv,
2775                                struct ib_cm_sidr_rep_param *param)
2776 {
2777         cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
2778                           cm_id_priv->tid);
2779         sidr_rep_msg->request_id = cm_id_priv->id.remote_id;
2780         sidr_rep_msg->status = param->status;
2781         cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num));
2782         sidr_rep_msg->service_id = cm_id_priv->id.service_id;
2783         sidr_rep_msg->qkey = cpu_to_be32(param->qkey);
2784
2785         if (param->info && param->info_length)
2786                 memcpy(sidr_rep_msg->info, param->info, param->info_length);
2787
2788         if (param->private_data && param->private_data_len)
2789                 memcpy(sidr_rep_msg->private_data, param->private_data,
2790                        param->private_data_len);
2791 }
2792
2793 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
2794                         struct ib_cm_sidr_rep_param *param)
2795 {
2796         struct cm_id_private *cm_id_priv;
2797         struct ib_mad_send_buf *msg;
2798         unsigned long flags;
2799         int ret;
2800
2801         if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
2802             (param->private_data &&
2803              param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE))
2804                 return -EINVAL;
2805
2806         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2807         spin_lock_irqsave(&cm_id_priv->lock, flags);
2808         if (cm_id->state != IB_CM_SIDR_REQ_RCVD) {
2809                 ret = -EINVAL;
2810                 goto error;
2811         }
2812
2813         ret = cm_alloc_msg(cm_id_priv, &msg);
2814         if (ret)
2815                 goto error;
2816
2817         cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
2818                            param);
2819         ret = ib_post_send_mad(msg, NULL);
2820         if (ret) {
2821                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2822                 cm_free_msg(msg);
2823                 return ret;
2824         }
2825         cm_id->state = IB_CM_IDLE;
2826         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2827
2828         spin_lock_irqsave(&cm.lock, flags);
2829         rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
2830         spin_unlock_irqrestore(&cm.lock, flags);
2831         return 0;
2832
2833 error:  spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2834         return ret;
2835 }
2836 EXPORT_SYMBOL(ib_send_cm_sidr_rep);
2837
2838 static void cm_format_sidr_rep_event(struct cm_work *work)
2839 {
2840         struct cm_sidr_rep_msg *sidr_rep_msg;
2841         struct ib_cm_sidr_rep_event_param *param;
2842
2843         sidr_rep_msg = (struct cm_sidr_rep_msg *)
2844                                 work->mad_recv_wc->recv_buf.mad;
2845         param = &work->cm_event.param.sidr_rep_rcvd;
2846         param->status = sidr_rep_msg->status;
2847         param->qkey = be32_to_cpu(sidr_rep_msg->qkey);
2848         param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg));
2849         param->info = &sidr_rep_msg->info;
2850         param->info_len = sidr_rep_msg->info_length;
2851         work->cm_event.private_data = &sidr_rep_msg->private_data;
2852 }
2853
2854 static int cm_sidr_rep_handler(struct cm_work *work)
2855 {
2856         struct cm_sidr_rep_msg *sidr_rep_msg;
2857         struct cm_id_private *cm_id_priv;
2858         unsigned long flags;
2859
2860         sidr_rep_msg = (struct cm_sidr_rep_msg *)
2861                                 work->mad_recv_wc->recv_buf.mad;
2862         cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0);
2863         if (!cm_id_priv)
2864                 return -EINVAL; /* Unmatched reply. */
2865
2866         spin_lock_irqsave(&cm_id_priv->lock, flags);
2867         if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
2868                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2869                 goto out;
2870         }
2871         cm_id_priv->id.state = IB_CM_IDLE;
2872         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2873         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2874
2875         cm_format_sidr_rep_event(work);
2876         cm_process_work(cm_id_priv, work);
2877         return 0;
2878 out:
2879         cm_deref_id(cm_id_priv);
2880         return -EINVAL;
2881 }
2882
2883 static void cm_process_send_error(struct ib_mad_send_buf *msg,
2884                                   enum ib_wc_status wc_status)
2885 {
2886         struct cm_id_private *cm_id_priv;
2887         struct ib_cm_event cm_event;
2888         enum ib_cm_state state;
2889         unsigned long flags;
2890         int ret;
2891
2892         memset(&cm_event, 0, sizeof cm_event);
2893         cm_id_priv = msg->context[0];
2894
2895         /* Discard old sends or ones without a response. */
2896         spin_lock_irqsave(&cm_id_priv->lock, flags);
2897         state = (enum ib_cm_state) (unsigned long) msg->context[1];
2898         if (msg != cm_id_priv->msg || state != cm_id_priv->id.state)
2899                 goto discard;
2900
2901         switch (state) {
2902         case IB_CM_REQ_SENT:
2903         case IB_CM_MRA_REQ_RCVD:
2904                 cm_reset_to_idle(cm_id_priv);
2905                 cm_event.event = IB_CM_REQ_ERROR;
2906                 break;
2907         case IB_CM_REP_SENT:
2908         case IB_CM_MRA_REP_RCVD:
2909                 cm_reset_to_idle(cm_id_priv);
2910                 cm_event.event = IB_CM_REP_ERROR;
2911                 break;
2912         case IB_CM_DREQ_SENT:
2913                 cm_enter_timewait(cm_id_priv);
2914                 cm_event.event = IB_CM_DREQ_ERROR;
2915                 break;
2916         case IB_CM_SIDR_REQ_SENT:
2917                 cm_id_priv->id.state = IB_CM_IDLE;
2918                 cm_event.event = IB_CM_SIDR_REQ_ERROR;
2919                 break;
2920         default:
2921                 goto discard;
2922         }
2923         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2924         cm_event.param.send_status = wc_status;
2925
2926         /* No other events can occur on the cm_id at this point. */
2927         ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
2928         cm_free_msg(msg);
2929         if (ret)
2930                 ib_destroy_cm_id(&cm_id_priv->id);
2931         return;
2932 discard:
2933         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2934         cm_free_msg(msg);
2935 }
2936
2937 static void cm_send_handler(struct ib_mad_agent *mad_agent,
2938                             struct ib_mad_send_wc *mad_send_wc)
2939 {
2940         struct ib_mad_send_buf *msg = mad_send_wc->send_buf;
2941
2942         switch (mad_send_wc->status) {
2943         case IB_WC_SUCCESS:
2944         case IB_WC_WR_FLUSH_ERR:
2945                 cm_free_msg(msg);
2946                 break;
2947         default:
2948                 if (msg->context[0] && msg->context[1])
2949                         cm_process_send_error(msg, mad_send_wc->status);
2950                 else
2951                         cm_free_msg(msg);
2952                 break;
2953         }
2954 }
2955
2956 static void cm_work_handler(void *data)
2957 {
2958         struct cm_work *work = data;
2959         int ret;
2960
2961         switch (work->cm_event.event) {
2962         case IB_CM_REQ_RECEIVED:
2963                 ret = cm_req_handler(work);
2964                 break;
2965         case IB_CM_MRA_RECEIVED:
2966                 ret = cm_mra_handler(work);
2967                 break;
2968         case IB_CM_REJ_RECEIVED:
2969                 ret = cm_rej_handler(work);
2970                 break;
2971         case IB_CM_REP_RECEIVED:
2972                 ret = cm_rep_handler(work);
2973                 break;
2974         case IB_CM_RTU_RECEIVED:
2975                 ret = cm_rtu_handler(work);
2976                 break;
2977         case IB_CM_USER_ESTABLISHED:
2978                 ret = cm_establish_handler(work);
2979                 break;
2980         case IB_CM_DREQ_RECEIVED:
2981                 ret = cm_dreq_handler(work);
2982                 break;
2983         case IB_CM_DREP_RECEIVED:
2984                 ret = cm_drep_handler(work);
2985                 break;
2986         case IB_CM_SIDR_REQ_RECEIVED:
2987                 ret = cm_sidr_req_handler(work);
2988                 break;
2989         case IB_CM_SIDR_REP_RECEIVED:
2990                 ret = cm_sidr_rep_handler(work);
2991                 break;
2992         case IB_CM_LAP_RECEIVED:
2993                 ret = cm_lap_handler(work);
2994                 break;
2995         case IB_CM_APR_RECEIVED:
2996                 ret = cm_apr_handler(work);
2997                 break;
2998         case IB_CM_TIMEWAIT_EXIT:
2999                 ret = cm_timewait_handler(work);
3000                 break;
3001         default:
3002                 ret = -EINVAL;
3003                 break;
3004         }
3005         if (ret)
3006                 cm_free_work(work);
3007 }
3008
3009 int ib_cm_establish(struct ib_cm_id *cm_id)
3010 {
3011         struct cm_id_private *cm_id_priv;
3012         struct cm_work *work;
3013         unsigned long flags;
3014         int ret = 0;
3015
3016         work = kmalloc(sizeof *work, GFP_ATOMIC);
3017         if (!work)
3018                 return -ENOMEM;
3019
3020         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3021         spin_lock_irqsave(&cm_id_priv->lock, flags);
3022         switch (cm_id->state)
3023         {
3024         case IB_CM_REP_SENT:
3025         case IB_CM_MRA_REP_RCVD:
3026                 cm_id->state = IB_CM_ESTABLISHED;
3027                 break;
3028         case IB_CM_ESTABLISHED:
3029                 ret = -EISCONN;
3030                 break;
3031         default:
3032                 ret = -EINVAL;
3033                 break;
3034         }
3035         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3036
3037         if (ret) {
3038                 kfree(work);
3039                 goto out;
3040         }
3041
3042         /*
3043          * The CM worker thread may try to destroy the cm_id before it
3044          * can execute this work item.  To prevent potential deadlock,
3045          * we need to find the cm_id once we're in the context of the
3046          * worker thread, rather than holding a reference on it.
3047          */
3048         INIT_WORK(&work->work, cm_work_handler, work);
3049         work->local_id = cm_id->local_id;
3050         work->remote_id = cm_id->remote_id;
3051         work->mad_recv_wc = NULL;
3052         work->cm_event.event = IB_CM_USER_ESTABLISHED;
3053         queue_work(cm.wq, &work->work);
3054 out:
3055         return ret;
3056 }
3057 EXPORT_SYMBOL(ib_cm_establish);
3058
3059 static void cm_recv_handler(struct ib_mad_agent *mad_agent,
3060                             struct ib_mad_recv_wc *mad_recv_wc)
3061 {
3062         struct cm_work *work;
3063         enum ib_cm_event_type event;
3064         int paths = 0;
3065
3066         switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
3067         case CM_REQ_ATTR_ID:
3068                 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)->
3069                                                     alt_local_lid != 0);
3070                 event = IB_CM_REQ_RECEIVED;
3071                 break;
3072         case CM_MRA_ATTR_ID:
3073                 event = IB_CM_MRA_RECEIVED;
3074                 break;
3075         case CM_REJ_ATTR_ID:
3076                 event = IB_CM_REJ_RECEIVED;
3077                 break;
3078         case CM_REP_ATTR_ID:
3079                 event = IB_CM_REP_RECEIVED;
3080                 break;
3081         case CM_RTU_ATTR_ID:
3082                 event = IB_CM_RTU_RECEIVED;
3083                 break;
3084         case CM_DREQ_ATTR_ID:
3085                 event = IB_CM_DREQ_RECEIVED;
3086                 break;
3087         case CM_DREP_ATTR_ID:
3088                 event = IB_CM_DREP_RECEIVED;
3089                 break;
3090         case CM_SIDR_REQ_ATTR_ID:
3091                 event = IB_CM_SIDR_REQ_RECEIVED;
3092                 break;
3093         case CM_SIDR_REP_ATTR_ID:
3094                 event = IB_CM_SIDR_REP_RECEIVED;
3095                 break;
3096         case CM_LAP_ATTR_ID:
3097                 paths = 1;
3098                 event = IB_CM_LAP_RECEIVED;
3099                 break;
3100         case CM_APR_ATTR_ID:
3101                 event = IB_CM_APR_RECEIVED;
3102                 break;
3103         default:
3104                 ib_free_recv_mad(mad_recv_wc);
3105                 return;
3106         }
3107
3108         work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths,
3109                        GFP_KERNEL);
3110         if (!work) {
3111                 ib_free_recv_mad(mad_recv_wc);
3112                 return;
3113         }
3114
3115         INIT_WORK(&work->work, cm_work_handler, work);
3116         work->cm_event.event = event;
3117         work->mad_recv_wc = mad_recv_wc;
3118         work->port = (struct cm_port *)mad_agent->context;
3119         queue_work(cm.wq, &work->work);
3120 }
3121
3122 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
3123                                 struct ib_qp_attr *qp_attr,
3124                                 int *qp_attr_mask)
3125 {
3126         unsigned long flags;
3127         int ret;
3128
3129         spin_lock_irqsave(&cm_id_priv->lock, flags);
3130         switch (cm_id_priv->id.state) {
3131         case IB_CM_REQ_SENT:
3132         case IB_CM_MRA_REQ_RCVD:
3133         case IB_CM_REQ_RCVD:
3134         case IB_CM_MRA_REQ_SENT:
3135         case IB_CM_REP_RCVD:
3136         case IB_CM_MRA_REP_SENT:
3137         case IB_CM_REP_SENT:
3138         case IB_CM_MRA_REP_RCVD:
3139         case IB_CM_ESTABLISHED:
3140                 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
3141                                 IB_QP_PKEY_INDEX | IB_QP_PORT;
3142                 qp_attr->qp_access_flags = IB_ACCESS_LOCAL_WRITE |
3143                                            IB_ACCESS_REMOTE_WRITE;
3144                 if (cm_id_priv->responder_resources)
3145                         qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ |
3146                                                     IB_ACCESS_REMOTE_ATOMIC;
3147                 qp_attr->pkey_index = cm_id_priv->av.pkey_index;
3148                 qp_attr->port_num = cm_id_priv->av.port->port_num;
3149                 ret = 0;
3150                 break;
3151         default:
3152                 ret = -EINVAL;
3153                 break;
3154         }
3155         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3156         return ret;
3157 }
3158
3159 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
3160                                struct ib_qp_attr *qp_attr,
3161                                int *qp_attr_mask)
3162 {
3163         unsigned long flags;
3164         int ret;
3165
3166         spin_lock_irqsave(&cm_id_priv->lock, flags);
3167         switch (cm_id_priv->id.state) {
3168         case IB_CM_REQ_RCVD:
3169         case IB_CM_MRA_REQ_SENT:
3170         case IB_CM_REP_RCVD:
3171         case IB_CM_MRA_REP_SENT:
3172         case IB_CM_REP_SENT:
3173         case IB_CM_MRA_REP_RCVD:
3174         case IB_CM_ESTABLISHED:
3175                 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
3176                                 IB_QP_DEST_QPN | IB_QP_RQ_PSN;
3177                 qp_attr->ah_attr = cm_id_priv->av.ah_attr;
3178                 qp_attr->path_mtu = cm_id_priv->path_mtu;
3179                 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
3180                 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
3181                 if (cm_id_priv->qp_type == IB_QPT_RC) {
3182                         *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC |
3183                                          IB_QP_MIN_RNR_TIMER;
3184                         qp_attr->max_dest_rd_atomic =
3185                                         cm_id_priv->responder_resources;
3186                         qp_attr->min_rnr_timer = 0;
3187                 }
3188                 if (cm_id_priv->alt_av.ah_attr.dlid) {
3189                         *qp_attr_mask |= IB_QP_ALT_PATH;
3190                         qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
3191                         qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3192                 }
3193                 ret = 0;
3194                 break;
3195         default:
3196                 ret = -EINVAL;
3197                 break;
3198         }
3199         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3200         return ret;
3201 }
3202
3203 static int cm_init_qp_rts_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_REP_RCVD:
3213         case IB_CM_MRA_REP_SENT:
3214         case IB_CM_REP_SENT:
3215         case IB_CM_MRA_REP_RCVD:
3216         case IB_CM_ESTABLISHED:
3217                 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN;
3218                 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn);
3219                 if (cm_id_priv->qp_type == IB_QPT_RC) {
3220                         *qp_attr_mask |= IB_QP_TIMEOUT | IB_QP_RETRY_CNT |
3221                                          IB_QP_RNR_RETRY |
3222                                          IB_QP_MAX_QP_RD_ATOMIC;
3223                         qp_attr->timeout = cm_id_priv->local_ack_timeout;
3224                         qp_attr->retry_cnt = cm_id_priv->retry_count;
3225                         qp_attr->rnr_retry = cm_id_priv->rnr_retry_count;
3226                         qp_attr->max_rd_atomic = cm_id_priv->initiator_depth;
3227                 }
3228                 if (cm_id_priv->alt_av.ah_attr.dlid) {
3229                         *qp_attr_mask |= IB_QP_PATH_MIG_STATE;
3230                         qp_attr->path_mig_state = IB_MIG_REARM;
3231                 }
3232                 ret = 0;
3233                 break;
3234         default:
3235                 ret = -EINVAL;
3236                 break;
3237         }
3238         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3239         return ret;
3240 }
3241
3242 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
3243                        struct ib_qp_attr *qp_attr,
3244                        int *qp_attr_mask)
3245 {
3246         struct cm_id_private *cm_id_priv;
3247         int ret;
3248
3249         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3250         switch (qp_attr->qp_state) {
3251         case IB_QPS_INIT:
3252                 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask);
3253                 break;
3254         case IB_QPS_RTR:
3255                 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask);
3256                 break;
3257         case IB_QPS_RTS:
3258                 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask);
3259                 break;
3260         default:
3261                 ret = -EINVAL;
3262                 break;
3263         }
3264         return ret;
3265 }
3266 EXPORT_SYMBOL(ib_cm_init_qp_attr);
3267
3268 static void cm_add_one(struct ib_device *device)
3269 {
3270         struct cm_device *cm_dev;
3271         struct cm_port *port;
3272         struct ib_mad_reg_req reg_req = {
3273                 .mgmt_class = IB_MGMT_CLASS_CM,
3274                 .mgmt_class_version = IB_CM_CLASS_VERSION
3275         };
3276         struct ib_port_modify port_modify = {
3277                 .set_port_cap_mask = IB_PORT_CM_SUP
3278         };
3279         unsigned long flags;
3280         int ret;
3281         u8 i;
3282
3283         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
3284                 return;
3285
3286         cm_dev = kmalloc(sizeof(*cm_dev) + sizeof(*port) *
3287                          device->phys_port_cnt, GFP_KERNEL);
3288         if (!cm_dev)
3289                 return;
3290
3291         cm_dev->device = device;
3292         cm_dev->ca_guid = device->node_guid;
3293
3294         set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
3295         for (i = 1; i <= device->phys_port_cnt; i++) {
3296                 port = &cm_dev->port[i-1];
3297                 port->cm_dev = cm_dev;
3298                 port->port_num = i;
3299                 port->mad_agent = ib_register_mad_agent(device, i,
3300                                                         IB_QPT_GSI,
3301                                                         &reg_req,
3302                                                         0,
3303                                                         cm_send_handler,
3304                                                         cm_recv_handler,
3305                                                         port);
3306                 if (IS_ERR(port->mad_agent))
3307                         goto error1;
3308
3309                 ret = ib_modify_port(device, i, 0, &port_modify);
3310                 if (ret)
3311                         goto error2;
3312         }
3313         ib_set_client_data(device, &cm_client, cm_dev);
3314
3315         write_lock_irqsave(&cm.device_lock, flags);
3316         list_add_tail(&cm_dev->list, &cm.device_list);
3317         write_unlock_irqrestore(&cm.device_lock, flags);
3318         return;
3319
3320 error2:
3321         ib_unregister_mad_agent(port->mad_agent);
3322 error1:
3323         port_modify.set_port_cap_mask = 0;
3324         port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
3325         while (--i) {
3326                 port = &cm_dev->port[i-1];
3327                 ib_modify_port(device, port->port_num, 0, &port_modify);
3328                 ib_unregister_mad_agent(port->mad_agent);
3329         }
3330         kfree(cm_dev);
3331 }
3332
3333 static void cm_remove_one(struct ib_device *device)
3334 {
3335         struct cm_device *cm_dev;
3336         struct cm_port *port;
3337         struct ib_port_modify port_modify = {
3338                 .clr_port_cap_mask = IB_PORT_CM_SUP
3339         };
3340         unsigned long flags;
3341         int i;
3342
3343         cm_dev = ib_get_client_data(device, &cm_client);
3344         if (!cm_dev)
3345                 return;
3346
3347         write_lock_irqsave(&cm.device_lock, flags);
3348         list_del(&cm_dev->list);
3349         write_unlock_irqrestore(&cm.device_lock, flags);
3350
3351         for (i = 1; i <= device->phys_port_cnt; i++) {
3352                 port = &cm_dev->port[i-1];
3353                 ib_modify_port(device, port->port_num, 0, &port_modify);
3354                 ib_unregister_mad_agent(port->mad_agent);
3355         }
3356         kfree(cm_dev);
3357 }
3358
3359 static int __init ib_cm_init(void)
3360 {
3361         int ret;
3362
3363         memset(&cm, 0, sizeof cm);
3364         INIT_LIST_HEAD(&cm.device_list);
3365         rwlock_init(&cm.device_lock);
3366         spin_lock_init(&cm.lock);
3367         cm.listen_service_table = RB_ROOT;
3368         cm.listen_service_id = __constant_be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID);
3369         cm.remote_id_table = RB_ROOT;
3370         cm.remote_qp_table = RB_ROOT;
3371         cm.remote_sidr_table = RB_ROOT;
3372         idr_init(&cm.local_id_table);
3373         get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand);
3374         idr_pre_get(&cm.local_id_table, GFP_KERNEL);
3375
3376         cm.wq = create_workqueue("ib_cm");
3377         if (!cm.wq)
3378                 return -ENOMEM;
3379
3380         ret = ib_register_client(&cm_client);
3381         if (ret)
3382                 goto error;
3383
3384         return 0;
3385 error:
3386         destroy_workqueue(cm.wq);
3387         return ret;
3388 }
3389
3390 static void __exit ib_cm_cleanup(void)
3391 {
3392         destroy_workqueue(cm.wq);
3393         ib_unregister_client(&cm_client);
3394         idr_destroy(&cm.local_id_table);
3395 }
3396
3397 module_init(ib_cm_init);
3398 module_exit(ib_cm_cleanup);
3399