kernel/drivers/infiniband/core/cm.c

   1 /*
   2  * Copyright (c) 2004-2007 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
  36 #include <linux/completion.h>
  37 #include <linux/dma-mapping.h>
  38 #include <linux/device.h>
  39 #include <linux/module.h>
  40 #include <linux/err.h>
  41 #include <linux/idr.h>
  42 #include <linux/interrupt.h>
  43 #include <linux/random.h>
  44 #include <linux/rbtree.h>
  45 #include <linux/spinlock.h>
  46 #include <linux/slab.h>
  47 #include <linux/sysfs.h>
  48 #include <linux/workqueue.h>
  49 #include <linux/kdev_t.h>
  50 #include <linux/etherdevice.h>
  51
  52 #include <rdma/ib_cache.h>
  53 #include <rdma/ib_cm.h>
  54 #include "cm_msgs.h"
  55
  56 MODULE_AUTHOR("Sean Hefty");
  57 MODULE_DESCRIPTION("InfiniBand CM");
  58 MODULE_LICENSE("Dual BSD/GPL");
  59
  60 static void cm_add_one(struct ib_device *device);
  61 static void cm_remove_one(struct ib_device *device, void *client_data);
  62
  63 static struct ib_client cm_client = {
  64         .name   = "cm",
  65         .add    = cm_add_one,
  66         .remove = cm_remove_one
  67 };
  68
  69 static struct ib_cm {
  70         spinlock_t lock;
  71         struct list_head device_list;
  72         rwlock_t device_lock;
  73         struct rb_root listen_service_table;
  74         u64 listen_service_id;
  75         /* struct rb_root peer_service_table; todo: fix peer to peer */
  76         struct rb_root remote_qp_table;
  77         struct rb_root remote_id_table;
  78         struct rb_root remote_sidr_table;
  79         struct idr local_id_table;
  80         __be32 random_id_operand;
  81         struct list_head timewait_list;
  82         struct workqueue_struct *wq;
  83 } cm;
  84
  85 /* Counter indexes ordered by attribute ID */
  86 enum {
  87         CM_REQ_COUNTER,
  88         CM_MRA_COUNTER,
  89         CM_REJ_COUNTER,
  90         CM_REP_COUNTER,
  91         CM_RTU_COUNTER,
  92         CM_DREQ_COUNTER,
  93         CM_DREP_COUNTER,
  94         CM_SIDR_REQ_COUNTER,
  95         CM_SIDR_REP_COUNTER,
  96         CM_LAP_COUNTER,
  97         CM_APR_COUNTER,
  98         CM_ATTR_COUNT,
  99         CM_ATTR_ID_OFFSET = 0x0010,
 100 };
 101
 102 enum {
 103         CM_XMIT,
 104         CM_XMIT_RETRIES,
 105         CM_RECV,
 106         CM_RECV_DUPLICATES,
 107         CM_COUNTER_GROUPS
 108 };
 109
 110 static char const counter_group_names[CM_COUNTER_GROUPS]
 111                                      [sizeof("cm_rx_duplicates")] = {
 112         "cm_tx_msgs", "cm_tx_retries",
 113         "cm_rx_msgs", "cm_rx_duplicates"
 114 };
 115
 116 struct cm_counter_group {
 117         struct kobject obj;
 118         atomic_long_t counter[CM_ATTR_COUNT];
 119 };
 120
 121 struct cm_counter_attribute {
 122         struct attribute attr;
 123         int index;
 124 };
 125
 126 #define CM_COUNTER_ATTR(_name, _index) \
 127 struct cm_counter_attribute cm_##_name##_counter_attr = { \
 128         .attr = { .name = __stringify(_name), .mode = 0444 }, \
 129         .index = _index \
 130 }
 131
 132 static CM_COUNTER_ATTR(req, CM_REQ_COUNTER);
 133 static CM_COUNTER_ATTR(mra, CM_MRA_COUNTER);
 134 static CM_COUNTER_ATTR(rej, CM_REJ_COUNTER);
 135 static CM_COUNTER_ATTR(rep, CM_REP_COUNTER);
 136 static CM_COUNTER_ATTR(rtu, CM_RTU_COUNTER);
 137 static CM_COUNTER_ATTR(dreq, CM_DREQ_COUNTER);
 138 static CM_COUNTER_ATTR(drep, CM_DREP_COUNTER);
 139 static CM_COUNTER_ATTR(sidr_req, CM_SIDR_REQ_COUNTER);
 140 static CM_COUNTER_ATTR(sidr_rep, CM_SIDR_REP_COUNTER);
 141 static CM_COUNTER_ATTR(lap, CM_LAP_COUNTER);
 142 static CM_COUNTER_ATTR(apr, CM_APR_COUNTER);
 143
 144 static struct attribute *cm_counter_default_attrs[] = {
 145         &cm_req_counter_attr.attr,
 146         &cm_mra_counter_attr.attr,
 147         &cm_rej_counter_attr.attr,
 148         &cm_rep_counter_attr.attr,
 149         &cm_rtu_counter_attr.attr,
 150         &cm_dreq_counter_attr.attr,
 151         &cm_drep_counter_attr.attr,
 152         &cm_sidr_req_counter_attr.attr,
 153         &cm_sidr_rep_counter_attr.attr,
 154         &cm_lap_counter_attr.attr,
 155         &cm_apr_counter_attr.attr,
 156         NULL
 157 };
 158
 159 struct cm_port {
 160         struct cm_device *cm_dev;
 161         struct ib_mad_agent *mad_agent;
 162         struct kobject port_obj;
 163         u8 port_num;
 164         struct cm_counter_group counter_group[CM_COUNTER_GROUPS];
 165 };
 166
 167 struct cm_device {
 168         struct list_head list;
 169         struct ib_device *ib_device;
 170         struct device *device;
 171         u8 ack_delay;
 172         int going_down;
 173         struct cm_port *port[0];
 174 };
 175
 176 struct cm_av {
 177         struct cm_port *port;
 178         union ib_gid dgid;
 179         struct ib_ah_attr ah_attr;
 180         u16 pkey_index;
 181         u8 timeout;
 182 };
 183
 184 struct cm_work {
 185         struct delayed_work work;
 186         struct list_head list;
 187         struct cm_port *port;
 188         struct ib_mad_recv_wc *mad_recv_wc;     /* Received MADs */
 189         __be32 local_id;                        /* Established / timewait */
 190         __be32 remote_id;
 191         struct ib_cm_event cm_event;
 192         struct ib_sa_path_rec path[0];
 193 };
 194
 195 struct cm_timewait_info {
 196         struct cm_work work;                    /* Must be first. */
 197         struct list_head list;
 198         struct rb_node remote_qp_node;
 199         struct rb_node remote_id_node;
 200         __be64 remote_ca_guid;
 201         __be32 remote_qpn;
 202         u8 inserted_remote_qp;
 203         u8 inserted_remote_id;
 204 };
 205
 206 struct cm_id_private {
 207         struct ib_cm_id id;
 208
 209         struct rb_node service_node;
 210         struct rb_node sidr_id_node;
 211         spinlock_t lock;        /* Do not acquire inside cm.lock */
 212         struct completion comp;
 213         atomic_t refcount;
 214         /* Number of clients sharing this ib_cm_id. Only valid for listeners.
 215          * Protected by the cm.lock spinlock. */
 216         int listen_sharecount;
 217
 218         struct ib_mad_send_buf *msg;
 219         struct cm_timewait_info *timewait_info;
 220         /* todo: use alternate port on send failure */
 221         struct cm_av av;
 222         struct cm_av alt_av;
 223
 224         void *private_data;
 225         __be64 tid;
 226         __be32 local_qpn;
 227         __be32 remote_qpn;
 228         enum ib_qp_type qp_type;
 229         __be32 sq_psn;
 230         __be32 rq_psn;
 231         int timeout_ms;
 232         enum ib_mtu path_mtu;
 233         __be16 pkey;
 234         u8 private_data_len;
 235         u8 max_cm_retries;
 236         u8 peer_to_peer;
 237         u8 responder_resources;
 238         u8 initiator_depth;
 239         u8 retry_count;
 240         u8 rnr_retry_count;
 241         u8 service_timeout;
 242         u8 target_ack_delay;
 243
 244         struct list_head work_list;
 245         atomic_t work_count;
 246 };
 247
 248 static void cm_work_handler(struct work_struct *work);
 249
 250 static inline void cm_deref_id(struct cm_id_private *cm_id_priv)
 251 {
 252         if (atomic_dec_and_test(&cm_id_priv->refcount))
 253                 complete(&cm_id_priv->comp);
 254 }
 255
 256 static int cm_alloc_msg(struct cm_id_private *cm_id_priv,
 257                         struct ib_mad_send_buf **msg)
 258 {
 259         struct ib_mad_agent *mad_agent;
 260         struct ib_mad_send_buf *m;
 261         struct ib_ah *ah;
 262
 263         mad_agent = cm_id_priv->av.port->mad_agent;
 264         ah = ib_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr);
 265         if (IS_ERR(ah))
 266                 return PTR_ERR(ah);
 267
 268         m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn,
 269                                cm_id_priv->av.pkey_index,
 270                                0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
 271                                GFP_ATOMIC,
 272                                IB_MGMT_BASE_VERSION);
 273         if (IS_ERR(m)) {
 274                 ib_destroy_ah(ah);
 275                 return PTR_ERR(m);
 276         }
 277
 278         /* Timeout set by caller if response is expected. */
 279         m->ah = ah;
 280         m->retries = cm_id_priv->max_cm_retries;
 281
 282         atomic_inc(&cm_id_priv->refcount);
 283         m->context[0] = cm_id_priv;
 284         *msg = m;
 285         return 0;
 286 }
 287
 288 static int cm_alloc_response_msg(struct cm_port *port,
 289                                  struct ib_mad_recv_wc *mad_recv_wc,
 290                                  struct ib_mad_send_buf **msg)
 291 {
 292         struct ib_mad_send_buf *m;
 293         struct ib_ah *ah;
 294
 295         ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc,
 296                                   mad_recv_wc->recv_buf.grh, port->port_num);
 297         if (IS_ERR(ah))
 298                 return PTR_ERR(ah);
 299
 300         m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index,
 301                                0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
 302                                GFP_ATOMIC,
 303                                IB_MGMT_BASE_VERSION);
 304         if (IS_ERR(m)) {
 305                 ib_destroy_ah(ah);
 306                 return PTR_ERR(m);
 307         }
 308         m->ah = ah;
 309         *msg = m;
 310         return 0;
 311 }
 312
 313 static void cm_free_msg(struct ib_mad_send_buf *msg)
 314 {
 315         ib_destroy_ah(msg->ah);
 316         if (msg->context[0])
 317                 cm_deref_id(msg->context[0]);
 318         ib_free_send_mad(msg);
 319 }
 320
 321 static void * cm_copy_private_data(const void *private_data,
 322                                    u8 private_data_len)
 323 {
 324         void *data;
 325
 326         if (!private_data || !private_data_len)
 327                 return NULL;
 328
 329         data = kmemdup(private_data, private_data_len, GFP_KERNEL);
 330         if (!data)
 331                 return ERR_PTR(-ENOMEM);
 332
 333         return data;
 334 }
 335
 336 static void cm_set_private_data(struct cm_id_private *cm_id_priv,
 337                                  void *private_data, u8 private_data_len)
 338 {
 339         if (cm_id_priv->private_data && cm_id_priv->private_data_len)
 340                 kfree(cm_id_priv->private_data);
 341
 342         cm_id_priv->private_data = private_data;
 343         cm_id_priv->private_data_len = private_data_len;
 344 }
 345
 346 static void cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc,
 347                                     struct ib_grh *grh, struct cm_av *av)
 348 {
 349         av->port = port;
 350         av->pkey_index = wc->pkey_index;
 351         ib_init_ah_from_wc(port->cm_dev->ib_device, port->port_num, wc,
 352                            grh, &av->ah_attr);
 353 }
 354
 355 static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av)
 356 {
 357         struct cm_device *cm_dev;
 358         struct cm_port *port = NULL;
 359         unsigned long flags;
 360         int ret;
 361         u8 p;
 362         struct net_device *ndev = ib_get_ndev_from_path(path);
 363
 364         read_lock_irqsave(&cm.device_lock, flags);
 365         list_for_each_entry(cm_dev, &cm.device_list, list) {
 366                 if (!ib_find_cached_gid(cm_dev->ib_device, &path->sgid,
 367                                         ndev, &p, NULL)) {
 368                         port = cm_dev->port[p-1];
 369                         break;
 370                 }
 371         }
 372         read_unlock_irqrestore(&cm.device_lock, flags);
 373
 374         if (ndev)
 375                 dev_put(ndev);
 376
 377         if (!port)
 378                 return -EINVAL;
 379
 380         ret = ib_find_cached_pkey(cm_dev->ib_device, port->port_num,
 381                                   be16_to_cpu(path->pkey), &av->pkey_index);
 382         if (ret)
 383                 return ret;
 384
 385         av->port = port;
 386         ib_init_ah_from_path(cm_dev->ib_device, port->port_num, path,
 387                              &av->ah_attr);
 388         av->timeout = path->packet_life_time + 1;
 389
 390         return 0;
 391 }
 392
 393 static int cm_alloc_id(struct cm_id_private *cm_id_priv)
 394 {
 395         unsigned long flags;
 396         int id;
 397
 398         idr_preload(GFP_KERNEL);
 399         spin_lock_irqsave(&cm.lock, flags);
 400
 401         id = idr_alloc_cyclic(&cm.local_id_table, cm_id_priv, 0, 0, GFP_NOWAIT);
 402
 403         spin_unlock_irqrestore(&cm.lock, flags);
 404         idr_preload_end();
 405
 406         cm_id_priv->id.local_id = (__force __be32)id ^ cm.random_id_operand;
 407         return id < 0 ? id : 0;
 408 }
 409
 410 static void cm_free_id(__be32 local_id)
 411 {
 412         spin_lock_irq(&cm.lock);
 413         idr_remove(&cm.local_id_table,
 414                    (__force int) (local_id ^ cm.random_id_operand));
 415         spin_unlock_irq(&cm.lock);
 416 }
 417
 418 static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id)
 419 {
 420         struct cm_id_private *cm_id_priv;
 421
 422         cm_id_priv = idr_find(&cm.local_id_table,
 423                               (__force int) (local_id ^ cm.random_id_operand));
 424         if (cm_id_priv) {
 425                 if (cm_id_priv->id.remote_id == remote_id)
 426                         atomic_inc(&cm_id_priv->refcount);
 427                 else
 428                         cm_id_priv = NULL;
 429         }
 430
 431         return cm_id_priv;
 432 }
 433
 434 static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id)
 435 {
 436         struct cm_id_private *cm_id_priv;
 437
 438         spin_lock_irq(&cm.lock);
 439         cm_id_priv = cm_get_id(local_id, remote_id);
 440         spin_unlock_irq(&cm.lock);
 441
 442         return cm_id_priv;
 443 }
 444
 445 /*
 446  * Trivial helpers to strip endian annotation and compare; the
 447  * endianness doesn't actually matter since we just need a stable
 448  * order for the RB tree.
 449  */
 450 static int be32_lt(__be32 a, __be32 b)
 451 {
 452         return (__force u32) a < (__force u32) b;
 453 }
 454
 455 static int be32_gt(__be32 a, __be32 b)
 456 {
 457         return (__force u32) a > (__force u32) b;
 458 }
 459
 460 static int be64_lt(__be64 a, __be64 b)
 461 {
 462         return (__force u64) a < (__force u64) b;
 463 }
 464
 465 static int be64_gt(__be64 a, __be64 b)
 466 {
 467         return (__force u64) a > (__force u64) b;
 468 }
 469
 470 static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv)
 471 {
 472         struct rb_node **link = &cm.listen_service_table.rb_node;
 473         struct rb_node *parent = NULL;
 474         struct cm_id_private *cur_cm_id_priv;
 475         __be64 service_id = cm_id_priv->id.service_id;
 476         __be64 service_mask = cm_id_priv->id.service_mask;
 477
 478         while (*link) {
 479                 parent = *link;
 480                 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
 481                                           service_node);
 482                 if ((cur_cm_id_priv->id.service_mask & service_id) ==
 483                     (service_mask & cur_cm_id_priv->id.service_id) &&
 484                     (cm_id_priv->id.device == cur_cm_id_priv->id.device))
 485                         return cur_cm_id_priv;
 486
 487                 if (cm_id_priv->id.device < cur_cm_id_priv->id.device)
 488                         link = &(*link)->rb_left;
 489                 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device)
 490                         link = &(*link)->rb_right;
 491                 else if (be64_lt(service_id, cur_cm_id_priv->id.service_id))
 492                         link = &(*link)->rb_left;
 493                 else if (be64_gt(service_id, cur_cm_id_priv->id.service_id))
 494                         link = &(*link)->rb_right;
 495                 else
 496                         link = &(*link)->rb_right;
 497         }
 498         rb_link_node(&cm_id_priv->service_node, parent, link);
 499         rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table);
 500         return NULL;
 501 }
 502
 503 static struct cm_id_private * cm_find_listen(struct ib_device *device,
 504                                              __be64 service_id)
 505 {
 506         struct rb_node *node = cm.listen_service_table.rb_node;
 507         struct cm_id_private *cm_id_priv;
 508
 509         while (node) {
 510                 cm_id_priv = rb_entry(node, struct cm_id_private, service_node);
 511                 if ((cm_id_priv->id.service_mask & service_id) ==
 512                      cm_id_priv->id.service_id &&
 513                     (cm_id_priv->id.device == device))
 514                         return cm_id_priv;
 515
 516                 if (device < cm_id_priv->id.device)
 517                         node = node->rb_left;
 518                 else if (device > cm_id_priv->id.device)
 519                         node = node->rb_right;
 520                 else if (be64_lt(service_id, cm_id_priv->id.service_id))
 521                         node = node->rb_left;
 522                 else if (be64_gt(service_id, cm_id_priv->id.service_id))
 523                         node = node->rb_right;
 524                 else
 525                         node = node->rb_right;
 526         }
 527         return NULL;
 528 }
 529
 530 static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info
 531                                                      *timewait_info)
 532 {
 533         struct rb_node **link = &cm.remote_id_table.rb_node;
 534         struct rb_node *parent = NULL;
 535         struct cm_timewait_info *cur_timewait_info;
 536         __be64 remote_ca_guid = timewait_info->remote_ca_guid;
 537         __be32 remote_id = timewait_info->work.remote_id;
 538
 539         while (*link) {
 540                 parent = *link;
 541                 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
 542                                              remote_id_node);
 543                 if (be32_lt(remote_id, cur_timewait_info->work.remote_id))
 544                         link = &(*link)->rb_left;
 545                 else if (be32_gt(remote_id, cur_timewait_info->work.remote_id))
 546                         link = &(*link)->rb_right;
 547                 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
 548                         link = &(*link)->rb_left;
 549                 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
 550                         link = &(*link)->rb_right;
 551                 else
 552                         return cur_timewait_info;
 553         }
 554         timewait_info->inserted_remote_id = 1;
 555         rb_link_node(&timewait_info->remote_id_node, parent, link);
 556         rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table);
 557         return NULL;
 558 }
 559
 560 static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid,
 561                                                    __be32 remote_id)
 562 {
 563         struct rb_node *node = cm.remote_id_table.rb_node;
 564         struct cm_timewait_info *timewait_info;
 565
 566         while (node) {
 567                 timewait_info = rb_entry(node, struct cm_timewait_info,
 568                                          remote_id_node);
 569                 if (be32_lt(remote_id, timewait_info->work.remote_id))
 570                         node = node->rb_left;
 571                 else if (be32_gt(remote_id, timewait_info->work.remote_id))
 572                         node = node->rb_right;
 573                 else if (be64_lt(remote_ca_guid, timewait_info->remote_ca_guid))
 574                         node = node->rb_left;
 575                 else if (be64_gt(remote_ca_guid, timewait_info->remote_ca_guid))
 576                         node = node->rb_right;
 577                 else
 578                         return timewait_info;
 579         }
 580         return NULL;
 581 }
 582
 583 static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info
 584                                                       *timewait_info)
 585 {
 586         struct rb_node **link = &cm.remote_qp_table.rb_node;
 587         struct rb_node *parent = NULL;
 588         struct cm_timewait_info *cur_timewait_info;
 589         __be64 remote_ca_guid = timewait_info->remote_ca_guid;
 590         __be32 remote_qpn = timewait_info->remote_qpn;
 591
 592         while (*link) {
 593                 parent = *link;
 594                 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
 595                                              remote_qp_node);
 596                 if (be32_lt(remote_qpn, cur_timewait_info->remote_qpn))
 597                         link = &(*link)->rb_left;
 598                 else if (be32_gt(remote_qpn, cur_timewait_info->remote_qpn))
 599                         link = &(*link)->rb_right;
 600                 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
 601                         link = &(*link)->rb_left;
 602                 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
 603                         link = &(*link)->rb_right;
 604                 else
 605                         return cur_timewait_info;
 606         }
 607         timewait_info->inserted_remote_qp = 1;
 608         rb_link_node(&timewait_info->remote_qp_node, parent, link);
 609         rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table);
 610         return NULL;
 611 }
 612
 613 static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private
 614                                                     *cm_id_priv)
 615 {
 616         struct rb_node **link = &cm.remote_sidr_table.rb_node;
 617         struct rb_node *parent = NULL;
 618         struct cm_id_private *cur_cm_id_priv;
 619         union ib_gid *port_gid = &cm_id_priv->av.dgid;
 620         __be32 remote_id = cm_id_priv->id.remote_id;
 621
 622         while (*link) {
 623                 parent = *link;
 624                 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
 625                                           sidr_id_node);
 626                 if (be32_lt(remote_id, cur_cm_id_priv->id.remote_id))
 627                         link = &(*link)->rb_left;
 628                 else if (be32_gt(remote_id, cur_cm_id_priv->id.remote_id))
 629                         link = &(*link)->rb_right;
 630                 else {
 631                         int cmp;
 632                         cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid,
 633                                      sizeof *port_gid);
 634                         if (cmp < 0)
 635                                 link = &(*link)->rb_left;
 636                         else if (cmp > 0)
 637                                 link = &(*link)->rb_right;
 638                         else
 639                                 return cur_cm_id_priv;
 640                 }
 641         }
 642         rb_link_node(&cm_id_priv->sidr_id_node, parent, link);
 643         rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
 644         return NULL;
 645 }
 646
 647 static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv,
 648                                enum ib_cm_sidr_status status)
 649 {
 650         struct ib_cm_sidr_rep_param param;
 651
 652         memset(&param, 0, sizeof param);
 653         param.status = status;
 654         ib_send_cm_sidr_rep(&cm_id_priv->id, &param);
 655 }
 656
 657 struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
 658                                  ib_cm_handler cm_handler,
 659                                  void *context)
 660 {
 661         struct cm_id_private *cm_id_priv;
 662         int ret;
 663
 664         cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL);
 665         if (!cm_id_priv)
 666                 return ERR_PTR(-ENOMEM);
 667
 668         cm_id_priv->id.state = IB_CM_IDLE;
 669         cm_id_priv->id.device = device;
 670         cm_id_priv->id.cm_handler = cm_handler;
 671         cm_id_priv->id.context = context;
 672         cm_id_priv->id.remote_cm_qpn = 1;
 673         ret = cm_alloc_id(cm_id_priv);
 674         if (ret)
 675                 goto error;
 676
 677         spin_lock_init(&cm_id_priv->lock);
 678         init_completion(&cm_id_priv->comp);
 679         INIT_LIST_HEAD(&cm_id_priv->work_list);
 680         atomic_set(&cm_id_priv->work_count, -1);
 681         atomic_set(&cm_id_priv->refcount, 1);
 682         return &cm_id_priv->id;
 683
 684 error:
 685         kfree(cm_id_priv);
 686         return ERR_PTR(-ENOMEM);
 687 }
 688 EXPORT_SYMBOL(ib_create_cm_id);
 689
 690 static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv)
 691 {
 692         struct cm_work *work;
 693
 694         if (list_empty(&cm_id_priv->work_list))
 695                 return NULL;
 696
 697         work = list_entry(cm_id_priv->work_list.next, struct cm_work, list);
 698         list_del(&work->list);
 699         return work;
 700 }
 701
 702 static void cm_free_work(struct cm_work *work)
 703 {
 704         if (work->mad_recv_wc)
 705                 ib_free_recv_mad(work->mad_recv_wc);
 706         kfree(work);
 707 }
 708
 709 static inline int cm_convert_to_ms(int iba_time)
 710 {
 711         /* approximate conversion to ms from 4.096us x 2^iba_time */
 712         return 1 << max(iba_time - 8, 0);
 713 }
 714
 715 /*
 716  * calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time
 717  * Because of how ack_timeout is stored, adding one doubles the timeout.
 718  * To avoid large timeouts, select the max(ack_delay, life_time + 1), and
 719  * increment it (round up) only if the other is within 50%.
 720  */
 721 static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time)
 722 {
 723         int ack_timeout = packet_life_time + 1;
 724
 725         if (ack_timeout >= ca_ack_delay)
 726                 ack_timeout += (ca_ack_delay >= (ack_timeout - 1));
 727         else
 728                 ack_timeout = ca_ack_delay +
 729                               (ack_timeout >= (ca_ack_delay - 1));
 730
 731         return min(31, ack_timeout);
 732 }
 733
 734 static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info)
 735 {
 736         if (timewait_info->inserted_remote_id) {
 737                 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table);
 738                 timewait_info->inserted_remote_id = 0;
 739         }
 740
 741         if (timewait_info->inserted_remote_qp) {
 742                 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table);
 743                 timewait_info->inserted_remote_qp = 0;
 744         }
 745 }
 746
 747 static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id)
 748 {
 749         struct cm_timewait_info *timewait_info;
 750
 751         timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL);
 752         if (!timewait_info)
 753                 return ERR_PTR(-ENOMEM);
 754
 755         timewait_info->work.local_id = local_id;
 756         INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler);
 757         timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT;
 758         return timewait_info;
 759 }
 760
 761 static void cm_enter_timewait(struct cm_id_private *cm_id_priv)
 762 {
 763         int wait_time;
 764         unsigned long flags;
 765         struct cm_device *cm_dev;
 766
 767         cm_dev = ib_get_client_data(cm_id_priv->id.device, &cm_client);
 768         if (!cm_dev)
 769                 return;
 770
 771         spin_lock_irqsave(&cm.lock, flags);
 772         cm_cleanup_timewait(cm_id_priv->timewait_info);
 773         list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list);
 774         spin_unlock_irqrestore(&cm.lock, flags);
 775
 776         /*
 777          * The cm_id could be destroyed by the user before we exit timewait.
 778          * To protect against this, we search for the cm_id after exiting
 779          * timewait before notifying the user that we've exited timewait.
 780          */
 781         cm_id_priv->id.state = IB_CM_TIMEWAIT;
 782         wait_time = cm_convert_to_ms(cm_id_priv->av.timeout);
 783
 784         /* Check if the device started its remove_one */
 785         spin_lock_irqsave(&cm.lock, flags);
 786         if (!cm_dev->going_down)
 787                 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work,
 788                                    msecs_to_jiffies(wait_time));
 789         spin_unlock_irqrestore(&cm.lock, flags);
 790
 791         cm_id_priv->timewait_info = NULL;
 792 }
 793
 794 static void cm_reset_to_idle(struct cm_id_private *cm_id_priv)
 795 {
 796         unsigned long flags;
 797
 798         cm_id_priv->id.state = IB_CM_IDLE;
 799         if (cm_id_priv->timewait_info) {
 800                 spin_lock_irqsave(&cm.lock, flags);
 801                 cm_cleanup_timewait(cm_id_priv->timewait_info);
 802                 spin_unlock_irqrestore(&cm.lock, flags);
 803                 kfree(cm_id_priv->timewait_info);
 804                 cm_id_priv->timewait_info = NULL;
 805         }
 806 }
 807
 808 static void cm_destroy_id(struct ib_cm_id *cm_id, int err)
 809 {
 810         struct cm_id_private *cm_id_priv;
 811         struct cm_work *work;
 812
 813         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
 814 retest:
 815         spin_lock_irq(&cm_id_priv->lock);
 816         switch (cm_id->state) {
 817         case IB_CM_LISTEN:
 818                 spin_unlock_irq(&cm_id_priv->lock);
 819
 820                 spin_lock_irq(&cm.lock);
 821                 if (--cm_id_priv->listen_sharecount > 0) {
 822                         /* The id is still shared. */
 823                         cm_deref_id(cm_id_priv);
 824                         spin_unlock_irq(&cm.lock);
 825                         return;
 826                 }
 827                 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table);
 828                 spin_unlock_irq(&cm.lock);
 829                 break;
 830         case IB_CM_SIDR_REQ_SENT:
 831                 cm_id->state = IB_CM_IDLE;
 832                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
 833                 spin_unlock_irq(&cm_id_priv->lock);
 834                 break;
 835         case IB_CM_SIDR_REQ_RCVD:
 836                 spin_unlock_irq(&cm_id_priv->lock);
 837                 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT);
 838                 spin_lock_irq(&cm.lock);
 839                 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node))
 840                         rb_erase(&cm_id_priv->sidr_id_node,
 841                                  &cm.remote_sidr_table);
 842                 spin_unlock_irq(&cm.lock);
 843                 break;
 844         case IB_CM_REQ_SENT:
 845         case IB_CM_MRA_REQ_RCVD:
 846                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
 847                 spin_unlock_irq(&cm_id_priv->lock);
 848                 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT,
 849                                &cm_id_priv->id.device->node_guid,
 850                                sizeof cm_id_priv->id.device->node_guid,
 851                                NULL, 0);
 852                 break;
 853         case IB_CM_REQ_RCVD:
 854                 if (err == -ENOMEM) {
 855                         /* Do not reject to allow future retries. */
 856                         cm_reset_to_idle(cm_id_priv);
 857                         spin_unlock_irq(&cm_id_priv->lock);
 858                 } else {
 859                         spin_unlock_irq(&cm_id_priv->lock);
 860                         ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
 861                                        NULL, 0, NULL, 0);
 862                 }
 863                 break;
 864         case IB_CM_REP_SENT:
 865         case IB_CM_MRA_REP_RCVD:
 866                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
 867                 /* Fall through */
 868         case IB_CM_MRA_REQ_SENT:
 869         case IB_CM_REP_RCVD:
 870         case IB_CM_MRA_REP_SENT:
 871                 spin_unlock_irq(&cm_id_priv->lock);
 872                 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
 873                                NULL, 0, NULL, 0);
 874                 break;
 875         case IB_CM_ESTABLISHED:
 876                 spin_unlock_irq(&cm_id_priv->lock);
 877                 if (cm_id_priv->qp_type == IB_QPT_XRC_TGT)
 878                         break;
 879                 ib_send_cm_dreq(cm_id, NULL, 0);
 880                 goto retest;
 881         case IB_CM_DREQ_SENT:
 882                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
 883                 cm_enter_timewait(cm_id_priv);
 884                 spin_unlock_irq(&cm_id_priv->lock);
 885                 break;
 886         case IB_CM_DREQ_RCVD:
 887                 spin_unlock_irq(&cm_id_priv->lock);
 888                 ib_send_cm_drep(cm_id, NULL, 0);
 889                 break;
 890         default:
 891                 spin_unlock_irq(&cm_id_priv->lock);
 892                 break;
 893         }
 894
 895         cm_free_id(cm_id->local_id);
 896         cm_deref_id(cm_id_priv);
 897         wait_for_completion(&cm_id_priv->comp);
 898         while ((work = cm_dequeue_work(cm_id_priv)) != NULL)
 899                 cm_free_work(work);
 900         kfree(cm_id_priv->private_data);
 901         kfree(cm_id_priv);
 902 }
 903
 904 void ib_destroy_cm_id(struct ib_cm_id *cm_id)
 905 {
 906         cm_destroy_id(cm_id, 0);
 907 }
 908 EXPORT_SYMBOL(ib_destroy_cm_id);
 909
 910 /**
 911  * __ib_cm_listen - Initiates listening on the specified service ID for
 912  *   connection and service ID resolution requests.
 913  * @cm_id: Connection identifier associated with the listen request.
 914  * @service_id: Service identifier matched against incoming connection
 915  *   and service ID resolution requests.  The service ID should be specified
 916  *   network-byte order.  If set to IB_CM_ASSIGN_SERVICE_ID, the CM will
 917  *   assign a service ID to the caller.
 918  * @service_mask: Mask applied to service ID used to listen across a
 919  *   range of service IDs.  If set to 0, the service ID is matched
 920  *   exactly.  This parameter is ignored if %service_id is set to
 921  *   IB_CM_ASSIGN_SERVICE_ID.
 922  */
 923 static int __ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id,
 924                           __be64 service_mask)
 925 {
 926         struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
 927         int ret = 0;
 928
 929         service_mask = service_mask ? service_mask : ~cpu_to_be64(0);
 930         service_id &= service_mask;
 931         if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID &&
 932             (service_id != IB_CM_ASSIGN_SERVICE_ID))
 933                 return -EINVAL;
 934
 935         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
 936         if (cm_id->state != IB_CM_IDLE)
 937                 return -EINVAL;
 938
 939         cm_id->state = IB_CM_LISTEN;
 940         ++cm_id_priv->listen_sharecount;
 941
 942         if (service_id == IB_CM_ASSIGN_SERVICE_ID) {
 943                 cm_id->service_id = cpu_to_be64(cm.listen_service_id++);
 944                 cm_id->service_mask = ~cpu_to_be64(0);
 945         } else {
 946                 cm_id->service_id = service_id;
 947                 cm_id->service_mask = service_mask;
 948         }
 949         cur_cm_id_priv = cm_insert_listen(cm_id_priv);
 950
 951         if (cur_cm_id_priv) {
 952                 cm_id->state = IB_CM_IDLE;
 953                 --cm_id_priv->listen_sharecount;
 954                 ret = -EBUSY;
 955         }
 956         return ret;
 957 }
 958
 959 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask)
 960 {
 961         unsigned long flags;
 962         int ret;
 963
 964         spin_lock_irqsave(&cm.lock, flags);
 965         ret = __ib_cm_listen(cm_id, service_id, service_mask);
 966         spin_unlock_irqrestore(&cm.lock, flags);
 967
 968         return ret;
 969 }
 970 EXPORT_SYMBOL(ib_cm_listen);
 971
 972 /**
 973  * Create a new listening ib_cm_id and listen on the given service ID.
 974  *
 975  * If there's an existing ID listening on that same device and service ID,
 976  * return it.
 977  *
 978  * @device: Device associated with the cm_id.  All related communication will
 979  * be associated with the specified device.
 980  * @cm_handler: Callback invoked to notify the user of CM events.
 981  * @service_id: Service identifier matched against incoming connection
 982  *   and service ID resolution requests.  The service ID should be specified
 983  *   network-byte order.  If set to IB_CM_ASSIGN_SERVICE_ID, the CM will
 984  *   assign a service ID to the caller.
 985  *
 986  * Callers should call ib_destroy_cm_id when done with the listener ID.
 987  */
 988 struct ib_cm_id *ib_cm_insert_listen(struct ib_device *device,
 989                                      ib_cm_handler cm_handler,
 990                                      __be64 service_id)
 991 {
 992         struct cm_id_private *cm_id_priv;
 993         struct ib_cm_id *cm_id;
 994         unsigned long flags;
 995         int err = 0;
 996
 997         /* Create an ID in advance, since the creation may sleep */
 998         cm_id = ib_create_cm_id(device, cm_handler, NULL);
 999         if (IS_ERR(cm_id))
1000                 return cm_id;
1001
1002         spin_lock_irqsave(&cm.lock, flags);
1003
1004         if (service_id == IB_CM_ASSIGN_SERVICE_ID)
1005                 goto new_id;
1006
1007         /* Find an existing ID */
1008         cm_id_priv = cm_find_listen(device, service_id);
1009         if (cm_id_priv) {
1010                 if (cm_id->cm_handler != cm_handler || cm_id->context) {
1011                         /* Sharing an ib_cm_id with different handlers is not
1012                          * supported */
1013                         spin_unlock_irqrestore(&cm.lock, flags);
1014                         return ERR_PTR(-EINVAL);
1015                 }
1016                 atomic_inc(&cm_id_priv->refcount);
1017                 ++cm_id_priv->listen_sharecount;
1018                 spin_unlock_irqrestore(&cm.lock, flags);
1019
1020                 ib_destroy_cm_id(cm_id);
1021                 cm_id = &cm_id_priv->id;
1022                 return cm_id;
1023         }
1024
1025 new_id:
1026         /* Use newly created ID */
1027         err = __ib_cm_listen(cm_id, service_id, 0);
1028
1029         spin_unlock_irqrestore(&cm.lock, flags);
1030
1031         if (err) {
1032                 ib_destroy_cm_id(cm_id);
1033                 return ERR_PTR(err);
1034         }
1035         return cm_id;
1036 }
1037 EXPORT_SYMBOL(ib_cm_insert_listen);
1038
1039 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv,
1040                           enum cm_msg_sequence msg_seq)
1041 {
1042         u64 hi_tid, low_tid;
1043
1044         hi_tid   = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32;
1045         low_tid  = (u64) ((__force u32)cm_id_priv->id.local_id |
1046                           (msg_seq << 30));
1047         return cpu_to_be64(hi_tid | low_tid);
1048 }
1049
1050 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr,
1051                               __be16 attr_id, __be64 tid)
1052 {
1053         hdr->base_version  = IB_MGMT_BASE_VERSION;
1054         hdr->mgmt_class    = IB_MGMT_CLASS_CM;
1055         hdr->class_version = IB_CM_CLASS_VERSION;
1056         hdr->method        = IB_MGMT_METHOD_SEND;
1057         hdr->attr_id       = attr_id;
1058         hdr->tid           = tid;
1059 }
1060
1061 static void cm_format_req(struct cm_req_msg *req_msg,
1062                           struct cm_id_private *cm_id_priv,
1063                           struct ib_cm_req_param *param)
1064 {
1065         struct ib_sa_path_rec *pri_path = param->primary_path;
1066         struct ib_sa_path_rec *alt_path = param->alternate_path;
1067
1068         cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID,
1069                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ));
1070
1071         req_msg->local_comm_id = cm_id_priv->id.local_id;
1072         req_msg->service_id = param->service_id;
1073         req_msg->local_ca_guid = cm_id_priv->id.device->node_guid;
1074         cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num));
1075         cm_req_set_init_depth(req_msg, param->initiator_depth);
1076         cm_req_set_remote_resp_timeout(req_msg,
1077                                        param->remote_cm_response_timeout);
1078         cm_req_set_qp_type(req_msg, param->qp_type);
1079         cm_req_set_flow_ctrl(req_msg, param->flow_control);
1080         cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn));
1081         cm_req_set_local_resp_timeout(req_msg,
1082                                       param->local_cm_response_timeout);
1083         req_msg->pkey = param->primary_path->pkey;
1084         cm_req_set_path_mtu(req_msg, param->primary_path->mtu);
1085         cm_req_set_max_cm_retries(req_msg, param->max_cm_retries);
1086
1087         if (param->qp_type != IB_QPT_XRC_INI) {
1088                 cm_req_set_resp_res(req_msg, param->responder_resources);
1089                 cm_req_set_retry_count(req_msg, param->retry_count);
1090                 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count);
1091                 cm_req_set_srq(req_msg, param->srq);
1092         }
1093
1094         if (pri_path->hop_limit <= 1) {
1095                 req_msg->primary_local_lid = pri_path->slid;
1096                 req_msg->primary_remote_lid = pri_path->dlid;
1097         } else {
1098                 /* Work-around until there's a way to obtain remote LID info */
1099                 req_msg->primary_local_lid = IB_LID_PERMISSIVE;
1100                 req_msg->primary_remote_lid = IB_LID_PERMISSIVE;
1101         }
1102         req_msg->primary_local_gid = pri_path->sgid;
1103         req_msg->primary_remote_gid = pri_path->dgid;
1104         cm_req_set_primary_flow_label(req_msg, pri_path->flow_label);
1105         cm_req_set_primary_packet_rate(req_msg, pri_path->rate);
1106         req_msg->primary_traffic_class = pri_path->traffic_class;
1107         req_msg->primary_hop_limit = pri_path->hop_limit;
1108         cm_req_set_primary_sl(req_msg, pri_path->sl);
1109         cm_req_set_primary_subnet_local(req_msg, (pri_path->hop_limit <= 1));
1110         cm_req_set_primary_local_ack_timeout(req_msg,
1111                 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1112                                pri_path->packet_life_time));
1113
1114         if (alt_path) {
1115                 if (alt_path->hop_limit <= 1) {
1116                         req_msg->alt_local_lid = alt_path->slid;
1117                         req_msg->alt_remote_lid = alt_path->dlid;
1118                 } else {
1119                         req_msg->alt_local_lid = IB_LID_PERMISSIVE;
1120                         req_msg->alt_remote_lid = IB_LID_PERMISSIVE;
1121                 }
1122                 req_msg->alt_local_gid = alt_path->sgid;
1123                 req_msg->alt_remote_gid = alt_path->dgid;
1124                 cm_req_set_alt_flow_label(req_msg,
1125                                           alt_path->flow_label);
1126                 cm_req_set_alt_packet_rate(req_msg, alt_path->rate);
1127                 req_msg->alt_traffic_class = alt_path->traffic_class;
1128                 req_msg->alt_hop_limit = alt_path->hop_limit;
1129                 cm_req_set_alt_sl(req_msg, alt_path->sl);
1130                 cm_req_set_alt_subnet_local(req_msg, (alt_path->hop_limit <= 1));
1131                 cm_req_set_alt_local_ack_timeout(req_msg,
1132                         cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1133                                        alt_path->packet_life_time));
1134         }
1135
1136         if (param->private_data && param->private_data_len)
1137                 memcpy(req_msg->private_data, param->private_data,
1138                        param->private_data_len);
1139 }
1140
1141 static int cm_validate_req_param(struct ib_cm_req_param *param)
1142 {
1143         /* peer-to-peer not supported */
1144         if (param->peer_to_peer)
1145                 return -EINVAL;
1146
1147         if (!param->primary_path)
1148                 return -EINVAL;
1149
1150         if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC &&
1151             param->qp_type != IB_QPT_XRC_INI)
1152                 return -EINVAL;
1153
1154         if (param->private_data &&
1155             param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE)
1156                 return -EINVAL;
1157
1158         if (param->alternate_path &&
1159             (param->alternate_path->pkey != param->primary_path->pkey ||
1160              param->alternate_path->mtu != param->primary_path->mtu))
1161                 return -EINVAL;
1162
1163         return 0;
1164 }
1165
1166 int ib_send_cm_req(struct ib_cm_id *cm_id,
1167                    struct ib_cm_req_param *param)
1168 {
1169         struct cm_id_private *cm_id_priv;
1170         struct cm_req_msg *req_msg;
1171         unsigned long flags;
1172         int ret;
1173
1174         ret = cm_validate_req_param(param);
1175         if (ret)
1176                 return ret;
1177
1178         /* Verify that we're not in timewait. */
1179         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1180         spin_lock_irqsave(&cm_id_priv->lock, flags);
1181         if (cm_id->state != IB_CM_IDLE) {
1182                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1183                 ret = -EINVAL;
1184                 goto out;
1185         }
1186         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1187
1188         cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1189                                                             id.local_id);
1190         if (IS_ERR(cm_id_priv->timewait_info)) {
1191                 ret = PTR_ERR(cm_id_priv->timewait_info);
1192                 goto out;
1193         }
1194
1195         ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av);
1196         if (ret)
1197                 goto error1;
1198         if (param->alternate_path) {
1199                 ret = cm_init_av_by_path(param->alternate_path,
1200                                          &cm_id_priv->alt_av);
1201                 if (ret)
1202                         goto error1;
1203         }
1204         cm_id->service_id = param->service_id;
1205         cm_id->service_mask = ~cpu_to_be64(0);
1206         cm_id_priv->timeout_ms = cm_convert_to_ms(
1207                                     param->primary_path->packet_life_time) * 2 +
1208                                  cm_convert_to_ms(
1209                                     param->remote_cm_response_timeout);
1210         cm_id_priv->max_cm_retries = param->max_cm_retries;
1211         cm_id_priv->initiator_depth = param->initiator_depth;
1212         cm_id_priv->responder_resources = param->responder_resources;
1213         cm_id_priv->retry_count = param->retry_count;
1214         cm_id_priv->path_mtu = param->primary_path->mtu;
1215         cm_id_priv->pkey = param->primary_path->pkey;
1216         cm_id_priv->qp_type = param->qp_type;
1217
1218         ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg);
1219         if (ret)
1220                 goto error1;
1221
1222         req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad;
1223         cm_format_req(req_msg, cm_id_priv, param);
1224         cm_id_priv->tid = req_msg->hdr.tid;
1225         cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms;
1226         cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT;
1227
1228         cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg);
1229         cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg);
1230
1231         spin_lock_irqsave(&cm_id_priv->lock, flags);
1232         ret = ib_post_send_mad(cm_id_priv->msg, NULL);
1233         if (ret) {
1234                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1235                 goto error2;
1236         }
1237         BUG_ON(cm_id->state != IB_CM_IDLE);
1238         cm_id->state = IB_CM_REQ_SENT;
1239         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1240         return 0;
1241
1242 error2: cm_free_msg(cm_id_priv->msg);
1243 error1: kfree(cm_id_priv->timewait_info);
1244 out:    return ret;
1245 }
1246 EXPORT_SYMBOL(ib_send_cm_req);
1247
1248 static int cm_issue_rej(struct cm_port *port,
1249                         struct ib_mad_recv_wc *mad_recv_wc,
1250                         enum ib_cm_rej_reason reason,
1251                         enum cm_msg_response msg_rejected,
1252                         void *ari, u8 ari_length)
1253 {
1254         struct ib_mad_send_buf *msg = NULL;
1255         struct cm_rej_msg *rej_msg, *rcv_msg;
1256         int ret;
1257
1258         ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
1259         if (ret)
1260                 return ret;
1261
1262         /* We just need common CM header information.  Cast to any message. */
1263         rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad;
1264         rej_msg = (struct cm_rej_msg *) msg->mad;
1265
1266         cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid);
1267         rej_msg->remote_comm_id = rcv_msg->local_comm_id;
1268         rej_msg->local_comm_id = rcv_msg->remote_comm_id;
1269         cm_rej_set_msg_rejected(rej_msg, msg_rejected);
1270         rej_msg->reason = cpu_to_be16(reason);
1271
1272         if (ari && ari_length) {
1273                 cm_rej_set_reject_info_len(rej_msg, ari_length);
1274                 memcpy(rej_msg->ari, ari, ari_length);
1275         }
1276
1277         ret = ib_post_send_mad(msg, NULL);
1278         if (ret)
1279                 cm_free_msg(msg);
1280
1281         return ret;
1282 }
1283
1284 static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid,
1285                                     __be32 local_qpn, __be32 remote_qpn)
1286 {
1287         return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) ||
1288                 ((local_ca_guid == remote_ca_guid) &&
1289                  (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn))));
1290 }
1291
1292 static void cm_format_paths_from_req(struct cm_req_msg *req_msg,
1293                                             struct ib_sa_path_rec *primary_path,
1294                                             struct ib_sa_path_rec *alt_path)
1295 {
1296         memset(primary_path, 0, sizeof *primary_path);
1297         primary_path->dgid = req_msg->primary_local_gid;
1298         primary_path->sgid = req_msg->primary_remote_gid;
1299         primary_path->dlid = req_msg->primary_local_lid;
1300         primary_path->slid = req_msg->primary_remote_lid;
1301         primary_path->flow_label = cm_req_get_primary_flow_label(req_msg);
1302         primary_path->hop_limit = req_msg->primary_hop_limit;
1303         primary_path->traffic_class = req_msg->primary_traffic_class;
1304         primary_path->reversible = 1;
1305         primary_path->pkey = req_msg->pkey;
1306         primary_path->sl = cm_req_get_primary_sl(req_msg);
1307         primary_path->mtu_selector = IB_SA_EQ;
1308         primary_path->mtu = cm_req_get_path_mtu(req_msg);
1309         primary_path->rate_selector = IB_SA_EQ;
1310         primary_path->rate = cm_req_get_primary_packet_rate(req_msg);
1311         primary_path->packet_life_time_selector = IB_SA_EQ;
1312         primary_path->packet_life_time =
1313                 cm_req_get_primary_local_ack_timeout(req_msg);
1314         primary_path->packet_life_time -= (primary_path->packet_life_time > 0);
1315         primary_path->service_id = req_msg->service_id;
1316
1317         if (req_msg->alt_local_lid) {
1318                 memset(alt_path, 0, sizeof *alt_path);
1319                 alt_path->dgid = req_msg->alt_local_gid;
1320                 alt_path->sgid = req_msg->alt_remote_gid;
1321                 alt_path->dlid = req_msg->alt_local_lid;
1322                 alt_path->slid = req_msg->alt_remote_lid;
1323                 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg);
1324                 alt_path->hop_limit = req_msg->alt_hop_limit;
1325                 alt_path->traffic_class = req_msg->alt_traffic_class;
1326                 alt_path->reversible = 1;
1327                 alt_path->pkey = req_msg->pkey;
1328                 alt_path->sl = cm_req_get_alt_sl(req_msg);
1329                 alt_path->mtu_selector = IB_SA_EQ;
1330                 alt_path->mtu = cm_req_get_path_mtu(req_msg);
1331                 alt_path->rate_selector = IB_SA_EQ;
1332                 alt_path->rate = cm_req_get_alt_packet_rate(req_msg);
1333                 alt_path->packet_life_time_selector = IB_SA_EQ;
1334                 alt_path->packet_life_time =
1335                         cm_req_get_alt_local_ack_timeout(req_msg);
1336                 alt_path->packet_life_time -= (alt_path->packet_life_time > 0);
1337                 alt_path->service_id = req_msg->service_id;
1338         }
1339 }
1340
1341 static u16 cm_get_bth_pkey(struct cm_work *work)
1342 {
1343         struct ib_device *ib_dev = work->port->cm_dev->ib_device;
1344         u8 port_num = work->port->port_num;
1345         u16 pkey_index = work->mad_recv_wc->wc->pkey_index;
1346         u16 pkey;
1347         int ret;
1348
1349         ret = ib_get_cached_pkey(ib_dev, port_num, pkey_index, &pkey);
1350         if (ret) {
1351                 dev_warn_ratelimited(&ib_dev->dev, "ib_cm: Couldn't retrieve pkey for incoming request (port %d, pkey index %d). %d\n",
1352                                      port_num, pkey_index, ret);
1353                 return 0;
1354         }
1355
1356         return pkey;
1357 }
1358
1359 static void cm_format_req_event(struct cm_work *work,
1360                                 struct cm_id_private *cm_id_priv,
1361                                 struct ib_cm_id *listen_id)
1362 {
1363         struct cm_req_msg *req_msg;
1364         struct ib_cm_req_event_param *param;
1365
1366         req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1367         param = &work->cm_event.param.req_rcvd;
1368         param->listen_id = listen_id;
1369         param->bth_pkey = cm_get_bth_pkey(work);
1370         param->port = cm_id_priv->av.port->port_num;
1371         param->primary_path = &work->path[0];
1372         if (req_msg->alt_local_lid)
1373                 param->alternate_path = &work->path[1];
1374         else
1375                 param->alternate_path = NULL;
1376         param->remote_ca_guid = req_msg->local_ca_guid;
1377         param->remote_qkey = be32_to_cpu(req_msg->local_qkey);
1378         param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg));
1379         param->qp_type = cm_req_get_qp_type(req_msg);
1380         param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg));
1381         param->responder_resources = cm_req_get_init_depth(req_msg);
1382         param->initiator_depth = cm_req_get_resp_res(req_msg);
1383         param->local_cm_response_timeout =
1384                                         cm_req_get_remote_resp_timeout(req_msg);
1385         param->flow_control = cm_req_get_flow_ctrl(req_msg);
1386         param->remote_cm_response_timeout =
1387                                         cm_req_get_local_resp_timeout(req_msg);
1388         param->retry_count = cm_req_get_retry_count(req_msg);
1389         param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1390         param->srq = cm_req_get_srq(req_msg);
1391         work->cm_event.private_data = &req_msg->private_data;
1392 }
1393
1394 static void cm_process_work(struct cm_id_private *cm_id_priv,
1395                             struct cm_work *work)
1396 {
1397         int ret;
1398
1399         /* We will typically only have the current event to report. */
1400         ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
1401         cm_free_work(work);
1402
1403         while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) {
1404                 spin_lock_irq(&cm_id_priv->lock);
1405                 work = cm_dequeue_work(cm_id_priv);
1406                 spin_unlock_irq(&cm_id_priv->lock);
1407                 BUG_ON(!work);
1408                 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id,
1409                                                 &work->cm_event);
1410                 cm_free_work(work);
1411         }
1412         cm_deref_id(cm_id_priv);
1413         if (ret)
1414                 cm_destroy_id(&cm_id_priv->id, ret);
1415 }
1416
1417 static void cm_format_mra(struct cm_mra_msg *mra_msg,
1418                           struct cm_id_private *cm_id_priv,
1419                           enum cm_msg_response msg_mraed, u8 service_timeout,
1420                           const void *private_data, u8 private_data_len)
1421 {
1422         cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid);
1423         cm_mra_set_msg_mraed(mra_msg, msg_mraed);
1424         mra_msg->local_comm_id = cm_id_priv->id.local_id;
1425         mra_msg->remote_comm_id = cm_id_priv->id.remote_id;
1426         cm_mra_set_service_timeout(mra_msg, service_timeout);
1427
1428         if (private_data && private_data_len)
1429                 memcpy(mra_msg->private_data, private_data, private_data_len);
1430 }
1431
1432 static void cm_format_rej(struct cm_rej_msg *rej_msg,
1433                           struct cm_id_private *cm_id_priv,
1434                           enum ib_cm_rej_reason reason,
1435                           void *ari,
1436                           u8 ari_length,
1437                           const void *private_data,
1438                           u8 private_data_len)
1439 {
1440         cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid);
1441         rej_msg->remote_comm_id = cm_id_priv->id.remote_id;
1442
1443         switch(cm_id_priv->id.state) {
1444         case IB_CM_REQ_RCVD:
1445                 rej_msg->local_comm_id = 0;
1446                 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1447                 break;
1448         case IB_CM_MRA_REQ_SENT:
1449                 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1450                 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1451                 break;
1452         case IB_CM_REP_RCVD:
1453         case IB_CM_MRA_REP_SENT:
1454                 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1455                 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP);
1456                 break;
1457         default:
1458                 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1459                 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER);
1460                 break;
1461         }
1462
1463         rej_msg->reason = cpu_to_be16(reason);
1464         if (ari && ari_length) {
1465                 cm_rej_set_reject_info_len(rej_msg, ari_length);
1466                 memcpy(rej_msg->ari, ari, ari_length);
1467         }
1468
1469         if (private_data && private_data_len)
1470                 memcpy(rej_msg->private_data, private_data, private_data_len);
1471 }
1472
1473 static void cm_dup_req_handler(struct cm_work *work,
1474                                struct cm_id_private *cm_id_priv)
1475 {
1476         struct ib_mad_send_buf *msg = NULL;
1477         int ret;
1478
1479         atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
1480                         counter[CM_REQ_COUNTER]);
1481
1482         /* Quick state check to discard duplicate REQs. */
1483         if (cm_id_priv->id.state == IB_CM_REQ_RCVD)
1484                 return;
1485
1486         ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1487         if (ret)
1488                 return;
1489
1490         spin_lock_irq(&cm_id_priv->lock);
1491         switch (cm_id_priv->id.state) {
1492         case IB_CM_MRA_REQ_SENT:
1493                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1494                               CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout,
1495                               cm_id_priv->private_data,
1496                               cm_id_priv->private_data_len);
1497                 break;
1498         case IB_CM_TIMEWAIT:
1499                 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv,
1500                               IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0);
1501                 break;
1502         default:
1503                 goto unlock;
1504         }
1505         spin_unlock_irq(&cm_id_priv->lock);
1506
1507         ret = ib_post_send_mad(msg, NULL);
1508         if (ret)
1509                 goto free;
1510         return;
1511
1512 unlock: spin_unlock_irq(&cm_id_priv->lock);
1513 free:   cm_free_msg(msg);
1514 }
1515
1516 static struct cm_id_private * cm_match_req(struct cm_work *work,
1517                                            struct cm_id_private *cm_id_priv)
1518 {
1519         struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv;
1520         struct cm_timewait_info *timewait_info;
1521         struct cm_req_msg *req_msg;
1522
1523         req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1524
1525         /* Check for possible duplicate REQ. */
1526         spin_lock_irq(&cm.lock);
1527         timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info);
1528         if (timewait_info) {
1529                 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
1530                                            timewait_info->work.remote_id);
1531                 spin_unlock_irq(&cm.lock);
1532                 if (cur_cm_id_priv) {
1533                         cm_dup_req_handler(work, cur_cm_id_priv);
1534                         cm_deref_id(cur_cm_id_priv);
1535                 }
1536                 return NULL;
1537         }
1538
1539         /* Check for stale connections. */
1540         timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
1541         if (timewait_info) {
1542                 cm_cleanup_timewait(cm_id_priv->timewait_info);
1543                 spin_unlock_irq(&cm.lock);
1544                 cm_issue_rej(work->port, work->mad_recv_wc,
1545                              IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
1546                              NULL, 0);
1547                 return NULL;
1548         }
1549
1550         /* Find matching listen request. */
1551         listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device,
1552                                            req_msg->service_id);
1553         if (!listen_cm_id_priv) {
1554                 cm_cleanup_timewait(cm_id_priv->timewait_info);
1555                 spin_unlock_irq(&cm.lock);
1556                 cm_issue_rej(work->port, work->mad_recv_wc,
1557                              IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ,
1558                              NULL, 0);
1559                 goto out;
1560         }
1561         atomic_inc(&listen_cm_id_priv->refcount);
1562         atomic_inc(&cm_id_priv->refcount);
1563         cm_id_priv->id.state = IB_CM_REQ_RCVD;
1564         atomic_inc(&cm_id_priv->work_count);
1565         spin_unlock_irq(&cm.lock);
1566 out:
1567         return listen_cm_id_priv;
1568 }
1569
1570 /*
1571  * Work-around for inter-subnet connections.  If the LIDs are permissive,
1572  * we need to override the LID/SL data in the REQ with the LID information
1573  * in the work completion.
1574  */
1575 static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc)
1576 {
1577         if (!cm_req_get_primary_subnet_local(req_msg)) {
1578                 if (req_msg->primary_local_lid == IB_LID_PERMISSIVE) {
1579                         req_msg->primary_local_lid = cpu_to_be16(wc->slid);
1580                         cm_req_set_primary_sl(req_msg, wc->sl);
1581                 }
1582
1583                 if (req_msg->primary_remote_lid == IB_LID_PERMISSIVE)
1584                         req_msg->primary_remote_lid = cpu_to_be16(wc->dlid_path_bits);
1585         }
1586
1587         if (!cm_req_get_alt_subnet_local(req_msg)) {
1588                 if (req_msg->alt_local_lid == IB_LID_PERMISSIVE) {
1589                         req_msg->alt_local_lid = cpu_to_be16(wc->slid);
1590                         cm_req_set_alt_sl(req_msg, wc->sl);
1591                 }
1592
1593                 if (req_msg->alt_remote_lid == IB_LID_PERMISSIVE)
1594                         req_msg->alt_remote_lid = cpu_to_be16(wc->dlid_path_bits);
1595         }
1596 }
1597
1598 static int cm_req_handler(struct cm_work *work)
1599 {
1600         struct ib_cm_id *cm_id;
1601         struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
1602         struct cm_req_msg *req_msg;
1603         int ret;
1604
1605         req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1606
1607         cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL);
1608         if (IS_ERR(cm_id))
1609                 return PTR_ERR(cm_id);
1610
1611         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1612         cm_id_priv->id.remote_id = req_msg->local_comm_id;
1613         cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
1614                                 work->mad_recv_wc->recv_buf.grh,
1615                                 &cm_id_priv->av);
1616         cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1617                                                             id.local_id);
1618         if (IS_ERR(cm_id_priv->timewait_info)) {
1619                 ret = PTR_ERR(cm_id_priv->timewait_info);
1620                 goto destroy;
1621         }
1622         cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id;
1623         cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid;
1624         cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg);
1625
1626         listen_cm_id_priv = cm_match_req(work, cm_id_priv);
1627         if (!listen_cm_id_priv) {
1628                 ret = -EINVAL;
1629                 kfree(cm_id_priv->timewait_info);
1630                 goto destroy;
1631         }
1632
1633         cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
1634         cm_id_priv->id.context = listen_cm_id_priv->id.context;
1635         cm_id_priv->id.service_id = req_msg->service_id;
1636         cm_id_priv->id.service_mask = ~cpu_to_be64(0);
1637
1638         cm_process_routed_req(req_msg, work->mad_recv_wc->wc);
1639         cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]);
1640
1641         memcpy(work->path[0].dmac, cm_id_priv->av.ah_attr.dmac, ETH_ALEN);
1642         ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av);
1643         if (ret) {
1644                 ib_get_cached_gid(work->port->cm_dev->ib_device,
1645                                   work->port->port_num, 0, &work->path[0].sgid,
1646                                   NULL);
1647                 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID,
1648                                &work->path[0].sgid, sizeof work->path[0].sgid,
1649                                NULL, 0);
1650                 goto rejected;
1651         }
1652         if (req_msg->alt_local_lid) {
1653                 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av);
1654                 if (ret) {
1655                         ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID,
1656                                        &work->path[0].sgid,
1657                                        sizeof work->path[0].sgid, NULL, 0);
1658                         goto rejected;
1659                 }
1660         }
1661         cm_id_priv->tid = req_msg->hdr.tid;
1662         cm_id_priv->timeout_ms = cm_convert_to_ms(
1663                                         cm_req_get_local_resp_timeout(req_msg));
1664         cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg);
1665         cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg);
1666         cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg);
1667         cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg);
1668         cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg);
1669         cm_id_priv->pkey = req_msg->pkey;
1670         cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg);
1671         cm_id_priv->retry_count = cm_req_get_retry_count(req_msg);
1672         cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1673         cm_id_priv->qp_type = cm_req_get_qp_type(req_msg);
1674
1675         cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
1676         cm_process_work(cm_id_priv, work);
1677         cm_deref_id(listen_cm_id_priv);
1678         return 0;
1679
1680 rejected:
1681         atomic_dec(&cm_id_priv->refcount);
1682         cm_deref_id(listen_cm_id_priv);
1683 destroy:
1684         ib_destroy_cm_id(cm_id);
1685         return ret;
1686 }
1687
1688 static void cm_format_rep(struct cm_rep_msg *rep_msg,
1689                           struct cm_id_private *cm_id_priv,
1690                           struct ib_cm_rep_param *param)
1691 {
1692         cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid);
1693         rep_msg->local_comm_id = cm_id_priv->id.local_id;
1694         rep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1695         cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn));
1696         rep_msg->resp_resources = param->responder_resources;
1697         cm_rep_set_target_ack_delay(rep_msg,
1698                                     cm_id_priv->av.port->cm_dev->ack_delay);
1699         cm_rep_set_failover(rep_msg, param->failover_accepted);
1700         cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count);
1701         rep_msg->local_ca_guid = cm_id_priv->id.device->node_guid;
1702
1703         if (cm_id_priv->qp_type != IB_QPT_XRC_TGT) {
1704                 rep_msg->initiator_depth = param->initiator_depth;
1705                 cm_rep_set_flow_ctrl(rep_msg, param->flow_control);
1706                 cm_rep_set_srq(rep_msg, param->srq);
1707                 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num));
1708         } else {
1709                 cm_rep_set_srq(rep_msg, 1);
1710                 cm_rep_set_local_eecn(rep_msg, cpu_to_be32(param->qp_num));
1711         }
1712
1713         if (param->private_data && param->private_data_len)
1714                 memcpy(rep_msg->private_data, param->private_data,
1715                        param->private_data_len);
1716 }
1717
1718 int ib_send_cm_rep(struct ib_cm_id *cm_id,
1719                    struct ib_cm_rep_param *param)
1720 {
1721         struct cm_id_private *cm_id_priv;
1722         struct ib_mad_send_buf *msg;
1723         struct cm_rep_msg *rep_msg;
1724         unsigned long flags;
1725         int ret;
1726
1727         if (param->private_data &&
1728             param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE)
1729                 return -EINVAL;
1730
1731         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1732         spin_lock_irqsave(&cm_id_priv->lock, flags);
1733         if (cm_id->state != IB_CM_REQ_RCVD &&
1734             cm_id->state != IB_CM_MRA_REQ_SENT) {
1735                 ret = -EINVAL;
1736                 goto out;
1737         }
1738
1739         ret = cm_alloc_msg(cm_id_priv, &msg);
1740         if (ret)
1741                 goto out;
1742
1743         rep_msg = (struct cm_rep_msg *) msg->mad;
1744         cm_format_rep(rep_msg, cm_id_priv, param);
1745         msg->timeout_ms = cm_id_priv->timeout_ms;
1746         msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;
1747
1748         ret = ib_post_send_mad(msg, NULL);
1749         if (ret) {
1750                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1751                 cm_free_msg(msg);
1752                 return ret;
1753         }
1754
1755         cm_id->state = IB_CM_REP_SENT;
1756         cm_id_priv->msg = msg;
1757         cm_id_priv->initiator_depth = param->initiator_depth;
1758         cm_id_priv->responder_resources = param->responder_resources;
1759         cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg);
1760         cm_id_priv->local_qpn = cpu_to_be32(param->qp_num & 0xFFFFFF);
1761
1762 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1763         return ret;
1764 }
1765 EXPORT_SYMBOL(ib_send_cm_rep);
1766
1767 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg,
1768                           struct cm_id_private *cm_id_priv,
1769                           const void *private_data,
1770                           u8 private_data_len)
1771 {
1772         cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid);
1773         rtu_msg->local_comm_id = cm_id_priv->id.local_id;
1774         rtu_msg->remote_comm_id = cm_id_priv->id.remote_id;
1775
1776         if (private_data && private_data_len)
1777                 memcpy(rtu_msg->private_data, private_data, private_data_len);
1778 }
1779
1780 int ib_send_cm_rtu(struct ib_cm_id *cm_id,
1781                    const void *private_data,
1782                    u8 private_data_len)
1783 {
1784         struct cm_id_private *cm_id_priv;
1785         struct ib_mad_send_buf *msg;
1786         unsigned long flags;
1787         void *data;
1788         int ret;
1789
1790         if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE)
1791                 return -EINVAL;
1792
1793         data = cm_copy_private_data(private_data, private_data_len);
1794         if (IS_ERR(data))
1795                 return PTR_ERR(data);
1796
1797         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1798         spin_lock_irqsave(&cm_id_priv->lock, flags);
1799         if (cm_id->state != IB_CM_REP_RCVD &&
1800             cm_id->state != IB_CM_MRA_REP_SENT) {
1801                 ret = -EINVAL;
1802                 goto error;
1803         }
1804
1805         ret = cm_alloc_msg(cm_id_priv, &msg);
1806         if (ret)
1807                 goto error;
1808
1809         cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1810                       private_data, private_data_len);
1811
1812         ret = ib_post_send_mad(msg, NULL);
1813         if (ret) {
1814                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1815                 cm_free_msg(msg);
1816                 kfree(data);
1817                 return ret;
1818         }
1819
1820         cm_id->state = IB_CM_ESTABLISHED;
1821         cm_set_private_data(cm_id_priv, data, private_data_len);
1822         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1823         return 0;
1824
1825 error:  spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1826         kfree(data);
1827         return ret;
1828 }
1829 EXPORT_SYMBOL(ib_send_cm_rtu);
1830
1831 static void cm_format_rep_event(struct cm_work *work, enum ib_qp_type qp_type)
1832 {
1833         struct cm_rep_msg *rep_msg;
1834         struct ib_cm_rep_event_param *param;
1835
1836         rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1837         param = &work->cm_event.param.rep_rcvd;
1838         param->remote_ca_guid = rep_msg->local_ca_guid;
1839         param->remote_qkey = be32_to_cpu(rep_msg->local_qkey);
1840         param->remote_qpn = be32_to_cpu(cm_rep_get_qpn(rep_msg, qp_type));
1841         param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg));
1842         param->responder_resources = rep_msg->initiator_depth;
1843         param->initiator_depth = rep_msg->resp_resources;
1844         param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
1845         param->failover_accepted = cm_rep_get_failover(rep_msg);
1846         param->flow_control = cm_rep_get_flow_ctrl(rep_msg);
1847         param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1848         param->srq = cm_rep_get_srq(rep_msg);
1849         work->cm_event.private_data = &rep_msg->private_data;
1850 }
1851
1852 static void cm_dup_rep_handler(struct cm_work *work)
1853 {
1854         struct cm_id_private *cm_id_priv;
1855         struct cm_rep_msg *rep_msg;
1856         struct ib_mad_send_buf *msg = NULL;
1857         int ret;
1858
1859         rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad;
1860         cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id,
1861                                    rep_msg->local_comm_id);
1862         if (!cm_id_priv)
1863                 return;
1864
1865         atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
1866                         counter[CM_REP_COUNTER]);
1867         ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1868         if (ret)
1869                 goto deref;
1870
1871         spin_lock_irq(&cm_id_priv->lock);
1872         if (cm_id_priv->id.state == IB_CM_ESTABLISHED)
1873                 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1874                               cm_id_priv->private_data,
1875                               cm_id_priv->private_data_len);
1876         else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT)
1877                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1878                               CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout,
1879                               cm_id_priv->private_data,
1880                               cm_id_priv->private_data_len);
1881         else
1882                 goto unlock;
1883         spin_unlock_irq(&cm_id_priv->lock);
1884
1885         ret = ib_post_send_mad(msg, NULL);
1886         if (ret)
1887                 goto free;
1888         goto deref;
1889
1890 unlock: spin_unlock_irq(&cm_id_priv->lock);
1891 free:   cm_free_msg(msg);
1892 deref:  cm_deref_id(cm_id_priv);
1893 }
1894
1895 static int cm_rep_handler(struct cm_work *work)
1896 {
1897         struct cm_id_private *cm_id_priv;
1898         struct cm_rep_msg *rep_msg;
1899         int ret;
1900
1901         rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1902         cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0);
1903         if (!cm_id_priv) {
1904                 cm_dup_rep_handler(work);
1905                 return -EINVAL;
1906         }
1907
1908         cm_format_rep_event(work, cm_id_priv->qp_type);
1909
1910         spin_lock_irq(&cm_id_priv->lock);
1911         switch (cm_id_priv->id.state) {
1912         case IB_CM_REQ_SENT:
1913         case IB_CM_MRA_REQ_RCVD:
1914                 break;
1915         default:
1916                 spin_unlock_irq(&cm_id_priv->lock);
1917                 ret = -EINVAL;
1918                 goto error;
1919         }
1920
1921         cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id;
1922         cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid;
1923         cm_id_priv->timewait_info->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type);
1924
1925         spin_lock(&cm.lock);
1926         /* Check for duplicate REP. */
1927         if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
1928                 spin_unlock(&cm.lock);
1929                 spin_unlock_irq(&cm_id_priv->lock);
1930                 ret = -EINVAL;
1931                 goto error;
1932         }
1933         /* Check for a stale connection. */
1934         if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) {
1935                 rb_erase(&cm_id_priv->timewait_info->remote_id_node,
1936                          &cm.remote_id_table);
1937                 cm_id_priv->timewait_info->inserted_remote_id = 0;
1938                 spin_unlock(&cm.lock);
1939                 spin_unlock_irq(&cm_id_priv->lock);
1940                 cm_issue_rej(work->port, work->mad_recv_wc,
1941                              IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP,
1942                              NULL, 0);
1943                 ret = -EINVAL;
1944                 goto error;
1945         }
1946         spin_unlock(&cm.lock);
1947
1948         cm_id_priv->id.state = IB_CM_REP_RCVD;
1949         cm_id_priv->id.remote_id = rep_msg->local_comm_id;
1950         cm_id_priv->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type);
1951         cm_id_priv->initiator_depth = rep_msg->resp_resources;
1952         cm_id_priv->responder_resources = rep_msg->initiator_depth;
1953         cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg);
1954         cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1955         cm_id_priv->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
1956         cm_id_priv->av.timeout =
1957                         cm_ack_timeout(cm_id_priv->target_ack_delay,
1958                                        cm_id_priv->av.timeout - 1);
1959         cm_id_priv->alt_av.timeout =
1960                         cm_ack_timeout(cm_id_priv->target_ack_delay,
1961                                        cm_id_priv->alt_av.timeout - 1);
1962
1963         /* todo: handle peer_to_peer */
1964
1965         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1966         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1967         if (!ret)
1968                 list_add_tail(&work->list, &cm_id_priv->work_list);
1969         spin_unlock_irq(&cm_id_priv->lock);
1970
1971         if (ret)
1972                 cm_process_work(cm_id_priv, work);
1973         else
1974                 cm_deref_id(cm_id_priv);
1975         return 0;
1976
1977 error:
1978         cm_deref_id(cm_id_priv);
1979         return ret;
1980 }
1981
1982 static int cm_establish_handler(struct cm_work *work)
1983 {
1984         struct cm_id_private *cm_id_priv;
1985         int ret;
1986
1987         /* See comment in cm_establish about lookup. */
1988         cm_id_priv = cm_acquire_id(work->local_id, work->remote_id);
1989         if (!cm_id_priv)
1990                 return -EINVAL;
1991
1992         spin_lock_irq(&cm_id_priv->lock);
1993         if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
1994                 spin_unlock_irq(&cm_id_priv->lock);
1995                 goto out;
1996         }
1997
1998         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1999         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2000         if (!ret)
2001                 list_add_tail(&work->list, &cm_id_priv->work_list);
2002         spin_unlock_irq(&cm_id_priv->lock);
2003
2004         if (ret)
2005                 cm_process_work(cm_id_priv, work);
2006         else
2007                 cm_deref_id(cm_id_priv);
2008         return 0;
2009 out:
2010         cm_deref_id(cm_id_priv);
2011         return -EINVAL;
2012 }
2013
2014 static int cm_rtu_handler(struct cm_work *work)
2015 {
2016         struct cm_id_private *cm_id_priv;
2017         struct cm_rtu_msg *rtu_msg;
2018         int ret;
2019
2020         rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad;
2021         cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id,
2022                                    rtu_msg->local_comm_id);
2023         if (!cm_id_priv)
2024                 return -EINVAL;
2025
2026         work->cm_event.private_data = &rtu_msg->private_data;
2027
2028         spin_lock_irq(&cm_id_priv->lock);
2029         if (cm_id_priv->id.state != IB_CM_REP_SENT &&
2030             cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
2031                 spin_unlock_irq(&cm_id_priv->lock);
2032                 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2033                                 counter[CM_RTU_COUNTER]);
2034                 goto out;
2035         }
2036         cm_id_priv->id.state = IB_CM_ESTABLISHED;
2037
2038         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2039         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2040         if (!ret)
2041                 list_add_tail(&work->list, &cm_id_priv->work_list);
2042         spin_unlock_irq(&cm_id_priv->lock);
2043
2044         if (ret)
2045                 cm_process_work(cm_id_priv, work);
2046         else
2047                 cm_deref_id(cm_id_priv);
2048         return 0;
2049 out:
2050         cm_deref_id(cm_id_priv);
2051         return -EINVAL;
2052 }
2053
2054 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg,
2055                           struct cm_id_private *cm_id_priv,
2056                           const void *private_data,
2057                           u8 private_data_len)
2058 {
2059         cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID,
2060                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ));
2061         dreq_msg->local_comm_id = cm_id_priv->id.local_id;
2062         dreq_msg->remote_comm_id = cm_id_priv->id.remote_id;
2063         cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn);
2064
2065         if (private_data && private_data_len)
2066                 memcpy(dreq_msg->private_data, private_data, private_data_len);
2067 }
2068
2069 int ib_send_cm_dreq(struct ib_cm_id *cm_id,
2070                     const void *private_data,
2071                     u8 private_data_len)
2072 {
2073         struct cm_id_private *cm_id_priv;
2074         struct ib_mad_send_buf *msg;
2075         unsigned long flags;
2076         int ret;
2077
2078         if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE)
2079                 return -EINVAL;
2080
2081         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2082         spin_lock_irqsave(&cm_id_priv->lock, flags);
2083         if (cm_id->state != IB_CM_ESTABLISHED) {
2084                 ret = -EINVAL;
2085                 goto out;
2086         }
2087
2088         if (cm_id->lap_state == IB_CM_LAP_SENT ||
2089             cm_id->lap_state == IB_CM_MRA_LAP_RCVD)
2090                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2091
2092         ret = cm_alloc_msg(cm_id_priv, &msg);
2093         if (ret) {
2094                 cm_enter_timewait(cm_id_priv);
2095                 goto out;
2096         }
2097
2098         cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv,
2099                        private_data, private_data_len);
2100         msg->timeout_ms = cm_id_priv->timeout_ms;
2101         msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
2102
2103         ret = ib_post_send_mad(msg, NULL);
2104         if (ret) {
2105                 cm_enter_timewait(cm_id_priv);
2106                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2107                 cm_free_msg(msg);
2108                 return ret;
2109         }
2110
2111         cm_id->state = IB_CM_DREQ_SENT;
2112         cm_id_priv->msg = msg;
2113 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2114         return ret;
2115 }
2116 EXPORT_SYMBOL(ib_send_cm_dreq);
2117
2118 static void cm_format_drep(struct cm_drep_msg *drep_msg,
2119                           struct cm_id_private *cm_id_priv,
2120                           const void *private_data,
2121                           u8 private_data_len)
2122 {
2123         cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid);
2124         drep_msg->local_comm_id = cm_id_priv->id.local_id;
2125         drep_msg->remote_comm_id = cm_id_priv->id.remote_id;
2126
2127         if (private_data && private_data_len)
2128                 memcpy(drep_msg->private_data, private_data, private_data_len);
2129 }
2130
2131 int ib_send_cm_drep(struct ib_cm_id *cm_id,
2132                     const void *private_data,
2133                     u8 private_data_len)
2134 {
2135         struct cm_id_private *cm_id_priv;
2136         struct ib_mad_send_buf *msg;
2137         unsigned long flags;
2138         void *data;
2139         int ret;
2140
2141         if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
2142                 return -EINVAL;
2143
2144         data = cm_copy_private_data(private_data, private_data_len);
2145         if (IS_ERR(data))
2146                 return PTR_ERR(data);
2147
2148         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2149         spin_lock_irqsave(&cm_id_priv->lock, flags);
2150         if (cm_id->state != IB_CM_DREQ_RCVD) {
2151                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2152                 kfree(data);
2153                 return -EINVAL;
2154         }
2155
2156         cm_set_private_data(cm_id_priv, data, private_data_len);
2157         cm_enter_timewait(cm_id_priv);
2158
2159         ret = cm_alloc_msg(cm_id_priv, &msg);
2160         if (ret)
2161                 goto out;
2162
2163         cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2164                        private_data, private_data_len);
2165
2166         ret = ib_post_send_mad(msg, NULL);
2167         if (ret) {
2168                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2169                 cm_free_msg(msg);
2170                 return ret;
2171         }
2172
2173 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2174         return ret;
2175 }
2176 EXPORT_SYMBOL(ib_send_cm_drep);
2177
2178 static int cm_issue_drep(struct cm_port *port,
2179                          struct ib_mad_recv_wc *mad_recv_wc)
2180 {
2181         struct ib_mad_send_buf *msg = NULL;
2182         struct cm_dreq_msg *dreq_msg;
2183         struct cm_drep_msg *drep_msg;
2184         int ret;
2185
2186         ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
2187         if (ret)
2188                 return ret;
2189
2190         dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad;
2191         drep_msg = (struct cm_drep_msg *) msg->mad;
2192
2193         cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid);
2194         drep_msg->remote_comm_id = dreq_msg->local_comm_id;
2195         drep_msg->local_comm_id = dreq_msg->remote_comm_id;
2196
2197         ret = ib_post_send_mad(msg, NULL);
2198         if (ret)
2199                 cm_free_msg(msg);
2200
2201         return ret;
2202 }
2203
2204 static int cm_dreq_handler(struct cm_work *work)
2205 {
2206         struct cm_id_private *cm_id_priv;
2207         struct cm_dreq_msg *dreq_msg;
2208         struct ib_mad_send_buf *msg = NULL;
2209         int ret;
2210
2211         dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
2212         cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id,
2213                                    dreq_msg->local_comm_id);
2214         if (!cm_id_priv) {
2215                 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2216                                 counter[CM_DREQ_COUNTER]);
2217                 cm_issue_drep(work->port, work->mad_recv_wc);
2218                 return -EINVAL;
2219         }
2220
2221         work->cm_event.private_data = &dreq_msg->private_data;
2222
2223         spin_lock_irq(&cm_id_priv->lock);
2224         if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg))
2225                 goto unlock;
2226
2227         switch (cm_id_priv->id.state) {
2228         case IB_CM_REP_SENT:
2229         case IB_CM_DREQ_SENT:
2230                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2231                 break;
2232         case IB_CM_ESTABLISHED:
2233                 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT ||
2234                     cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2235                         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2236                 break;
2237         case IB_CM_MRA_REP_RCVD:
2238                 break;
2239         case IB_CM_TIMEWAIT:
2240                 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2241                                 counter[CM_DREQ_COUNTER]);
2242                 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2243                         goto unlock;
2244
2245                 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2246                                cm_id_priv->private_data,
2247                                cm_id_priv->private_data_len);
2248                 spin_unlock_irq(&cm_id_priv->lock);
2249
2250                 if (ib_post_send_mad(msg, NULL))
2251                         cm_free_msg(msg);
2252                 goto deref;
2253         case IB_CM_DREQ_RCVD:
2254                 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2255                                 counter[CM_DREQ_COUNTER]);
2256                 goto unlock;
2257         default:
2258                 goto unlock;
2259         }
2260         cm_id_priv->id.state = IB_CM_DREQ_RCVD;
2261         cm_id_priv->tid = dreq_msg->hdr.tid;
2262         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2263         if (!ret)
2264                 list_add_tail(&work->list, &cm_id_priv->work_list);
2265         spin_unlock_irq(&cm_id_priv->lock);
2266
2267         if (ret)
2268                 cm_process_work(cm_id_priv, work);
2269         else
2270                 cm_deref_id(cm_id_priv);
2271         return 0;
2272
2273 unlock: spin_unlock_irq(&cm_id_priv->lock);
2274 deref:  cm_deref_id(cm_id_priv);
2275         return -EINVAL;
2276 }
2277
2278 static int cm_drep_handler(struct cm_work *work)
2279 {
2280         struct cm_id_private *cm_id_priv;
2281         struct cm_drep_msg *drep_msg;
2282         int ret;
2283
2284         drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
2285         cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id,
2286                                    drep_msg->local_comm_id);
2287         if (!cm_id_priv)
2288                 return -EINVAL;
2289
2290         work->cm_event.private_data = &drep_msg->private_data;
2291
2292         spin_lock_irq(&cm_id_priv->lock);
2293         if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
2294             cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
2295                 spin_unlock_irq(&cm_id_priv->lock);
2296                 goto out;
2297         }
2298         cm_enter_timewait(cm_id_priv);
2299
2300         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2301         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2302         if (!ret)
2303                 list_add_tail(&work->list, &cm_id_priv->work_list);
2304         spin_unlock_irq(&cm_id_priv->lock);
2305
2306         if (ret)
2307                 cm_process_work(cm_id_priv, work);
2308         else
2309                 cm_deref_id(cm_id_priv);
2310         return 0;
2311 out:
2312         cm_deref_id(cm_id_priv);
2313         return -EINVAL;
2314 }
2315
2316 int ib_send_cm_rej(struct ib_cm_id *cm_id,
2317                    enum ib_cm_rej_reason reason,
2318                    void *ari,
2319                    u8 ari_length,
2320                    const void *private_data,
2321                    u8 private_data_len)
2322 {
2323         struct cm_id_private *cm_id_priv;
2324         struct ib_mad_send_buf *msg;
2325         unsigned long flags;
2326         int ret;
2327
2328         if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
2329             (ari && ari_length > IB_CM_REJ_ARI_LENGTH))
2330                 return -EINVAL;
2331
2332         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2333
2334         spin_lock_irqsave(&cm_id_priv->lock, flags);
2335         switch (cm_id->state) {
2336         case IB_CM_REQ_SENT:
2337         case IB_CM_MRA_REQ_RCVD:
2338         case IB_CM_REQ_RCVD:
2339         case IB_CM_MRA_REQ_SENT:
2340         case IB_CM_REP_RCVD:
2341         case IB_CM_MRA_REP_SENT:
2342                 ret = cm_alloc_msg(cm_id_priv, &msg);
2343                 if (!ret)
2344                         cm_format_rej((struct cm_rej_msg *) msg->mad,
2345                                       cm_id_priv, reason, ari, ari_length,
2346                                       private_data, private_data_len);
2347
2348                 cm_reset_to_idle(cm_id_priv);
2349                 break;
2350         case IB_CM_REP_SENT:
2351         case IB_CM_MRA_REP_RCVD:
2352                 ret = cm_alloc_msg(cm_id_priv, &msg);
2353                 if (!ret)
2354                         cm_format_rej((struct cm_rej_msg *) msg->mad,
2355                                       cm_id_priv, reason, ari, ari_length,
2356                                       private_data, private_data_len);
2357
2358                 cm_enter_timewait(cm_id_priv);
2359                 break;
2360         default:
2361                 ret = -EINVAL;
2362                 goto out;
2363         }
2364
2365         if (ret)
2366                 goto out;
2367
2368         ret = ib_post_send_mad(msg, NULL);
2369         if (ret)
2370                 cm_free_msg(msg);
2371
2372 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2373         return ret;
2374 }
2375 EXPORT_SYMBOL(ib_send_cm_rej);
2376
2377 static void cm_format_rej_event(struct cm_work *work)
2378 {
2379         struct cm_rej_msg *rej_msg;
2380         struct ib_cm_rej_event_param *param;
2381
2382         rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2383         param = &work->cm_event.param.rej_rcvd;
2384         param->ari = rej_msg->ari;
2385         param->ari_length = cm_rej_get_reject_info_len(rej_msg);
2386         param->reason = __be16_to_cpu(rej_msg->reason);
2387         work->cm_event.private_data = &rej_msg->private_data;
2388 }
2389
2390 static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
2391 {
2392         struct cm_timewait_info *timewait_info;
2393         struct cm_id_private *cm_id_priv;
2394         __be32 remote_id;
2395
2396         remote_id = rej_msg->local_comm_id;
2397
2398         if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) {
2399                 spin_lock_irq(&cm.lock);
2400                 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari),
2401                                                   remote_id);
2402                 if (!timewait_info) {
2403                         spin_unlock_irq(&cm.lock);
2404                         return NULL;
2405                 }
2406                 cm_id_priv = idr_find(&cm.local_id_table, (__force int)
2407                                       (timewait_info->work.local_id ^
2408                                        cm.random_id_operand));
2409                 if (cm_id_priv) {
2410                         if (cm_id_priv->id.remote_id == remote_id)
2411                                 atomic_inc(&cm_id_priv->refcount);
2412                         else
2413                                 cm_id_priv = NULL;
2414                 }
2415                 spin_unlock_irq(&cm.lock);
2416         } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ)
2417                 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0);
2418         else
2419                 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id);
2420
2421         return cm_id_priv;
2422 }
2423
2424 static int cm_rej_handler(struct cm_work *work)
2425 {
2426         struct cm_id_private *cm_id_priv;
2427         struct cm_rej_msg *rej_msg;
2428         int ret;
2429
2430         rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2431         cm_id_priv = cm_acquire_rejected_id(rej_msg);
2432         if (!cm_id_priv)
2433                 return -EINVAL;
2434
2435         cm_format_rej_event(work);
2436
2437         spin_lock_irq(&cm_id_priv->lock);
2438         switch (cm_id_priv->id.state) {
2439         case IB_CM_REQ_SENT:
2440         case IB_CM_MRA_REQ_RCVD:
2441         case IB_CM_REP_SENT:
2442         case IB_CM_MRA_REP_RCVD:
2443                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2444                 /* fall through */
2445         case IB_CM_REQ_RCVD:
2446         case IB_CM_MRA_REQ_SENT:
2447                 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN)
2448                         cm_enter_timewait(cm_id_priv);
2449                 else
2450                         cm_reset_to_idle(cm_id_priv);
2451                 break;
2452         case IB_CM_DREQ_SENT:
2453                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2454                 /* fall through */
2455         case IB_CM_REP_RCVD:
2456         case IB_CM_MRA_REP_SENT:
2457                 cm_enter_timewait(cm_id_priv);
2458                 break;
2459         case IB_CM_ESTABLISHED:
2460                 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT ||
2461                     cm_id_priv->id.lap_state == IB_CM_LAP_SENT) {
2462                         if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT)
2463                                 ib_cancel_mad(cm_id_priv->av.port->mad_agent,
2464                                               cm_id_priv->msg);
2465                         cm_enter_timewait(cm_id_priv);
2466                         break;
2467                 }
2468                 /* fall through */
2469         default:
2470                 spin_unlock_irq(&cm_id_priv->lock);
2471                 ret = -EINVAL;
2472                 goto out;
2473         }
2474
2475         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2476         if (!ret)
2477                 list_add_tail(&work->list, &cm_id_priv->work_list);
2478         spin_unlock_irq(&cm_id_priv->lock);
2479
2480         if (ret)
2481                 cm_process_work(cm_id_priv, work);
2482         else
2483                 cm_deref_id(cm_id_priv);
2484         return 0;
2485 out:
2486         cm_deref_id(cm_id_priv);
2487         return -EINVAL;
2488 }
2489
2490 int ib_send_cm_mra(struct ib_cm_id *cm_id,
2491                    u8 service_timeout,
2492                    const void *private_data,
2493                    u8 private_data_len)
2494 {
2495         struct cm_id_private *cm_id_priv;
2496         struct ib_mad_send_buf *msg;
2497         enum ib_cm_state cm_state;
2498         enum ib_cm_lap_state lap_state;
2499         enum cm_msg_response msg_response;
2500         void *data;
2501         unsigned long flags;
2502         int ret;
2503
2504         if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE)
2505                 return -EINVAL;
2506
2507         data = cm_copy_private_data(private_data, private_data_len);
2508         if (IS_ERR(data))
2509                 return PTR_ERR(data);
2510
2511         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2512
2513         spin_lock_irqsave(&cm_id_priv->lock, flags);
2514         switch(cm_id_priv->id.state) {
2515         case IB_CM_REQ_RCVD:
2516                 cm_state = IB_CM_MRA_REQ_SENT;
2517                 lap_state = cm_id->lap_state;
2518                 msg_response = CM_MSG_RESPONSE_REQ;
2519                 break;
2520         case IB_CM_REP_RCVD:
2521                 cm_state = IB_CM_MRA_REP_SENT;
2522                 lap_state = cm_id->lap_state;
2523                 msg_response = CM_MSG_RESPONSE_REP;
2524                 break;
2525         case IB_CM_ESTABLISHED:
2526                 if (cm_id->lap_state == IB_CM_LAP_RCVD) {
2527                         cm_state = cm_id->state;
2528                         lap_state = IB_CM_MRA_LAP_SENT;
2529                         msg_response = CM_MSG_RESPONSE_OTHER;
2530                         break;
2531                 }
2532         default:
2533                 ret = -EINVAL;
2534                 goto error1;
2535         }
2536
2537         if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) {
2538                 ret = cm_alloc_msg(cm_id_priv, &msg);
2539                 if (ret)
2540                         goto error1;
2541
2542                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2543                               msg_response, service_timeout,
2544                               private_data, private_data_len);
2545                 ret = ib_post_send_mad(msg, NULL);
2546                 if (ret)
2547                         goto error2;
2548         }
2549
2550         cm_id->state = cm_state;
2551         cm_id->lap_state = lap_state;
2552         cm_id_priv->service_timeout = service_timeout;
2553         cm_set_private_data(cm_id_priv, data, private_data_len);
2554         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2555         return 0;
2556
2557 error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2558         kfree(data);
2559         return ret;
2560
2561 error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2562         kfree(data);
2563         cm_free_msg(msg);
2564         return ret;
2565 }
2566 EXPORT_SYMBOL(ib_send_cm_mra);
2567
2568 static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
2569 {
2570         switch (cm_mra_get_msg_mraed(mra_msg)) {
2571         case CM_MSG_RESPONSE_REQ:
2572                 return cm_acquire_id(mra_msg->remote_comm_id, 0);
2573         case CM_MSG_RESPONSE_REP:
2574         case CM_MSG_RESPONSE_OTHER:
2575                 return cm_acquire_id(mra_msg->remote_comm_id,
2576                                      mra_msg->local_comm_id);
2577         default:
2578                 return NULL;
2579         }
2580 }
2581
2582 static int cm_mra_handler(struct cm_work *work)
2583 {
2584         struct cm_id_private *cm_id_priv;
2585         struct cm_mra_msg *mra_msg;
2586         int timeout, ret;
2587
2588         mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
2589         cm_id_priv = cm_acquire_mraed_id(mra_msg);
2590         if (!cm_id_priv)
2591                 return -EINVAL;
2592
2593         work->cm_event.private_data = &mra_msg->private_data;
2594         work->cm_event.param.mra_rcvd.service_timeout =
2595                                         cm_mra_get_service_timeout(mra_msg);
2596         timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) +
2597                   cm_convert_to_ms(cm_id_priv->av.timeout);
2598
2599         spin_lock_irq(&cm_id_priv->lock);
2600         switch (cm_id_priv->id.state) {
2601         case IB_CM_REQ_SENT:
2602                 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ ||
2603                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
2604                                   cm_id_priv->msg, timeout))
2605                         goto out;
2606                 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
2607                 break;
2608         case IB_CM_REP_SENT:
2609                 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP ||
2610                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
2611                                   cm_id_priv->msg, timeout))
2612                         goto out;
2613                 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
2614                 break;
2615         case IB_CM_ESTABLISHED:
2616                 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER ||
2617                     cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
2618                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
2619                                   cm_id_priv->msg, timeout)) {
2620                         if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2621                                 atomic_long_inc(&work->port->
2622                                                 counter_group[CM_RECV_DUPLICATES].
2623                                                 counter[CM_MRA_COUNTER]);
2624                         goto out;
2625                 }
2626                 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
2627                 break;
2628         case IB_CM_MRA_REQ_RCVD:
2629         case IB_CM_MRA_REP_RCVD:
2630                 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2631                                 counter[CM_MRA_COUNTER]);
2632                 /* fall through */
2633         default:
2634                 goto out;
2635         }
2636
2637         cm_id_priv->msg->context[1] = (void *) (unsigned long)
2638                                       cm_id_priv->id.state;
2639         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2640         if (!ret)
2641                 list_add_tail(&work->list, &cm_id_priv->work_list);
2642         spin_unlock_irq(&cm_id_priv->lock);
2643
2644         if (ret)
2645                 cm_process_work(cm_id_priv, work);
2646         else
2647                 cm_deref_id(cm_id_priv);
2648         return 0;
2649 out:
2650         spin_unlock_irq(&cm_id_priv->lock);
2651         cm_deref_id(cm_id_priv);
2652         return -EINVAL;
2653 }
2654
2655 static void cm_format_lap(struct cm_lap_msg *lap_msg,
2656                           struct cm_id_private *cm_id_priv,
2657                           struct ib_sa_path_rec *alternate_path,
2658                           const void *private_data,
2659                           u8 private_data_len)
2660 {
2661         cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID,
2662                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP));
2663         lap_msg->local_comm_id = cm_id_priv->id.local_id;
2664         lap_msg->remote_comm_id = cm_id_priv->id.remote_id;
2665         cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn);
2666         /* todo: need remote CM response timeout */
2667         cm_lap_set_remote_resp_timeout(lap_msg, 0x1F);
2668         lap_msg->alt_local_lid = alternate_path->slid;
2669         lap_msg->alt_remote_lid = alternate_path->dlid;
2670         lap_msg->alt_local_gid = alternate_path->sgid;
2671         lap_msg->alt_remote_gid = alternate_path->dgid;
2672         cm_lap_set_flow_label(lap_msg, alternate_path->flow_label);
2673         cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class);
2674         lap_msg->alt_hop_limit = alternate_path->hop_limit;
2675         cm_lap_set_packet_rate(lap_msg, alternate_path->rate);
2676         cm_lap_set_sl(lap_msg, alternate_path->sl);
2677         cm_lap_set_subnet_local(lap_msg, 1); /* local only... */
2678         cm_lap_set_local_ack_timeout(lap_msg,
2679                 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
2680                                alternate_path->packet_life_time));
2681
2682         if (private_data && private_data_len)
2683                 memcpy(lap_msg->private_data, private_data, private_data_len);
2684 }
2685
2686 int ib_send_cm_lap(struct ib_cm_id *cm_id,
2687                    struct ib_sa_path_rec *alternate_path,
2688                    const void *private_data,
2689                    u8 private_data_len)
2690 {
2691         struct cm_id_private *cm_id_priv;
2692         struct ib_mad_send_buf *msg;
2693         unsigned long flags;
2694         int ret;
2695
2696         if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE)
2697                 return -EINVAL;
2698
2699         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2700         spin_lock_irqsave(&cm_id_priv->lock, flags);
2701         if (cm_id->state != IB_CM_ESTABLISHED ||
2702             (cm_id->lap_state != IB_CM_LAP_UNINIT &&
2703              cm_id->lap_state != IB_CM_LAP_IDLE)) {
2704                 ret = -EINVAL;
2705                 goto out;
2706         }
2707
2708         ret = cm_init_av_by_path(alternate_path, &cm_id_priv->alt_av);
2709         if (ret)
2710                 goto out;
2711         cm_id_priv->alt_av.timeout =
2712                         cm_ack_timeout(cm_id_priv->target_ack_delay,
2713                                        cm_id_priv->alt_av.timeout - 1);
2714
2715         ret = cm_alloc_msg(cm_id_priv, &msg);
2716         if (ret)
2717                 goto out;
2718
2719         cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv,
2720                       alternate_path, private_data, private_data_len);
2721         msg->timeout_ms = cm_id_priv->timeout_ms;
2722         msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED;
2723
2724         ret = ib_post_send_mad(msg, NULL);
2725         if (ret) {
2726                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2727                 cm_free_msg(msg);
2728                 return ret;
2729         }
2730
2731         cm_id->lap_state = IB_CM_LAP_SENT;
2732         cm_id_priv->msg = msg;
2733
2734 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2735         return ret;
2736 }
2737 EXPORT_SYMBOL(ib_send_cm_lap);
2738
2739 static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv,
2740                                     struct ib_sa_path_rec *path,
2741                                     struct cm_lap_msg *lap_msg)
2742 {
2743         memset(path, 0, sizeof *path);
2744         path->dgid = lap_msg->alt_local_gid;
2745         path->sgid = lap_msg->alt_remote_gid;
2746         path->dlid = lap_msg->alt_local_lid;
2747         path->slid = lap_msg->alt_remote_lid;
2748         path->flow_label = cm_lap_get_flow_label(lap_msg);
2749         path->hop_limit = lap_msg->alt_hop_limit;
2750         path->traffic_class = cm_lap_get_traffic_class(lap_msg);
2751         path->reversible = 1;
2752         path->pkey = cm_id_priv->pkey;
2753         path->sl = cm_lap_get_sl(lap_msg);
2754         path->mtu_selector = IB_SA_EQ;
2755         path->mtu = cm_id_priv->path_mtu;
2756         path->rate_selector = IB_SA_EQ;
2757         path->rate = cm_lap_get_packet_rate(lap_msg);
2758         path->packet_life_time_selector = IB_SA_EQ;
2759         path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg);
2760         path->packet_life_time -= (path->packet_life_time > 0);
2761 }
2762
2763 static int cm_lap_handler(struct cm_work *work)
2764 {
2765         struct cm_id_private *cm_id_priv;
2766         struct cm_lap_msg *lap_msg;
2767         struct ib_cm_lap_event_param *param;
2768         struct ib_mad_send_buf *msg = NULL;
2769         int ret;
2770
2771         /* todo: verify LAP request and send reject APR if invalid. */
2772         lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
2773         cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id,
2774                                    lap_msg->local_comm_id);
2775         if (!cm_id_priv)
2776                 return -EINVAL;
2777
2778         param = &work->cm_event.param.lap_rcvd;
2779         param->alternate_path = &work->path[0];
2780         cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg);
2781         work->cm_event.private_data = &lap_msg->private_data;
2782
2783         spin_lock_irq(&cm_id_priv->lock);
2784         if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
2785                 goto unlock;
2786
2787         switch (cm_id_priv->id.lap_state) {
2788         case IB_CM_LAP_UNINIT:
2789         case IB_CM_LAP_IDLE:
2790                 break;
2791         case IB_CM_MRA_LAP_SENT:
2792                 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2793                                 counter[CM_LAP_COUNTER]);
2794                 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2795                         goto unlock;
2796
2797                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2798                               CM_MSG_RESPONSE_OTHER,
2799                               cm_id_priv->service_timeout,
2800                               cm_id_priv->private_data,
2801                               cm_id_priv->private_data_len);
2802                 spin_unlock_irq(&cm_id_priv->lock);
2803
2804                 if (ib_post_send_mad(msg, NULL))
2805                         cm_free_msg(msg);
2806                 goto deref;
2807         case IB_CM_LAP_RCVD:
2808                 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2809                                 counter[CM_LAP_COUNTER]);
2810                 goto unlock;
2811         default:
2812                 goto unlock;
2813         }
2814
2815         cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
2816         cm_id_priv->tid = lap_msg->hdr.tid;
2817         cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2818                                 work->mad_recv_wc->recv_buf.grh,
2819                                 &cm_id_priv->av);
2820         cm_init_av_by_path(param->alternate_path, &cm_id_priv->alt_av);
2821         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2822         if (!ret)
2823                 list_add_tail(&work->list, &cm_id_priv->work_list);
2824         spin_unlock_irq(&cm_id_priv->lock);
2825
2826         if (ret)
2827                 cm_process_work(cm_id_priv, work);
2828         else
2829                 cm_deref_id(cm_id_priv);
2830         return 0;
2831
2832 unlock: spin_unlock_irq(&cm_id_priv->lock);
2833 deref:  cm_deref_id(cm_id_priv);
2834         return -EINVAL;
2835 }
2836
2837 static void cm_format_apr(struct cm_apr_msg *apr_msg,
2838                           struct cm_id_private *cm_id_priv,
2839                           enum ib_cm_apr_status status,
2840                           void *info,
2841                           u8 info_length,
2842                           const void *private_data,
2843                           u8 private_data_len)
2844 {
2845         cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid);
2846         apr_msg->local_comm_id = cm_id_priv->id.local_id;
2847         apr_msg->remote_comm_id = cm_id_priv->id.remote_id;
2848         apr_msg->ap_status = (u8) status;
2849
2850         if (info && info_length) {
2851                 apr_msg->info_length = info_length;
2852                 memcpy(apr_msg->info, info, info_length);
2853         }
2854
2855         if (private_data && private_data_len)
2856                 memcpy(apr_msg->private_data, private_data, private_data_len);
2857 }
2858
2859 int ib_send_cm_apr(struct ib_cm_id *cm_id,
2860                    enum ib_cm_apr_status status,
2861                    void *info,
2862                    u8 info_length,
2863                    const void *private_data,
2864                    u8 private_data_len)
2865 {
2866         struct cm_id_private *cm_id_priv;
2867         struct ib_mad_send_buf *msg;
2868         unsigned long flags;
2869         int ret;
2870
2871         if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) ||
2872             (info && info_length > IB_CM_APR_INFO_LENGTH))
2873                 return -EINVAL;
2874
2875         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2876         spin_lock_irqsave(&cm_id_priv->lock, flags);
2877         if (cm_id->state != IB_CM_ESTABLISHED ||
2878             (cm_id->lap_state != IB_CM_LAP_RCVD &&
2879              cm_id->lap_state != IB_CM_MRA_LAP_SENT)) {
2880                 ret = -EINVAL;
2881                 goto out;
2882         }
2883
2884         ret = cm_alloc_msg(cm_id_priv, &msg);
2885         if (ret)
2886                 goto out;
2887
2888         cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status,
2889                       info, info_length, private_data, private_data_len);
2890         ret = ib_post_send_mad(msg, NULL);
2891         if (ret) {
2892                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2893                 cm_free_msg(msg);
2894                 return ret;
2895         }
2896
2897         cm_id->lap_state = IB_CM_LAP_IDLE;
2898 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2899         return ret;
2900 }
2901 EXPORT_SYMBOL(ib_send_cm_apr);
2902
2903 static int cm_apr_handler(struct cm_work *work)
2904 {
2905         struct cm_id_private *cm_id_priv;
2906         struct cm_apr_msg *apr_msg;
2907         int ret;
2908
2909         apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
2910         cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id,
2911                                    apr_msg->local_comm_id);
2912         if (!cm_id_priv)
2913                 return -EINVAL; /* Unmatched reply. */
2914
2915         work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status;
2916         work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info;
2917         work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length;
2918         work->cm_event.private_data = &apr_msg->private_data;
2919
2920         spin_lock_irq(&cm_id_priv->lock);
2921         if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
2922             (cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
2923              cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
2924                 spin_unlock_irq(&cm_id_priv->lock);
2925                 goto out;
2926         }
2927         cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
2928         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2929         cm_id_priv->msg = NULL;
2930
2931         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2932         if (!ret)
2933                 list_add_tail(&work->list, &cm_id_priv->work_list);
2934         spin_unlock_irq(&cm_id_priv->lock);
2935
2936         if (ret)
2937                 cm_process_work(cm_id_priv, work);
2938         else
2939                 cm_deref_id(cm_id_priv);
2940         return 0;
2941 out:
2942         cm_deref_id(cm_id_priv);
2943         return -EINVAL;
2944 }
2945
2946 static int cm_timewait_handler(struct cm_work *work)
2947 {
2948         struct cm_timewait_info *timewait_info;
2949         struct cm_id_private *cm_id_priv;
2950         int ret;
2951
2952         timewait_info = (struct cm_timewait_info *)work;
2953         spin_lock_irq(&cm.lock);
2954         list_del(&timewait_info->list);
2955         spin_unlock_irq(&cm.lock);
2956
2957         cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
2958                                    timewait_info->work.remote_id);
2959         if (!cm_id_priv)
2960                 return -EINVAL;
2961
2962         spin_lock_irq(&cm_id_priv->lock);
2963         if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
2964             cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
2965                 spin_unlock_irq(&cm_id_priv->lock);
2966                 goto out;
2967         }
2968         cm_id_priv->id.state = IB_CM_IDLE;
2969         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2970         if (!ret)
2971                 list_add_tail(&work->list, &cm_id_priv->work_list);
2972         spin_unlock_irq(&cm_id_priv->lock);
2973
2974         if (ret)
2975                 cm_process_work(cm_id_priv, work);
2976         else
2977                 cm_deref_id(cm_id_priv);
2978         return 0;
2979 out:
2980         cm_deref_id(cm_id_priv);
2981         return -EINVAL;
2982 }
2983
2984 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
2985                                struct cm_id_private *cm_id_priv,
2986                                struct ib_cm_sidr_req_param *param)
2987 {
2988         cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
2989                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR));
2990         sidr_req_msg->request_id = cm_id_priv->id.local_id;
2991         sidr_req_msg->pkey = param->path->pkey;
2992         sidr_req_msg->service_id = param->service_id;
2993
2994         if (param->private_data && param->private_data_len)
2995                 memcpy(sidr_req_msg->private_data, param->private_data,
2996                        param->private_data_len);
2997 }
2998
2999 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
3000                         struct ib_cm_sidr_req_param *param)
3001 {
3002         struct cm_id_private *cm_id_priv;
3003         struct ib_mad_send_buf *msg;
3004         unsigned long flags;
3005         int ret;
3006
3007         if (!param->path || (param->private_data &&
3008              param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
3009                 return -EINVAL;
3010
3011         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3012         ret = cm_init_av_by_path(param->path, &cm_id_priv->av);
3013         if (ret)
3014                 goto out;
3015
3016         cm_id->service_id = param->service_id;
3017         cm_id->service_mask = ~cpu_to_be64(0);
3018         cm_id_priv->timeout_ms = param->timeout_ms;
3019         cm_id_priv->max_cm_retries = param->max_cm_retries;
3020         ret = cm_alloc_msg(cm_id_priv, &msg);
3021         if (ret)
3022                 goto out;
3023
3024         cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv,
3025                            param);
3026         msg->timeout_ms = cm_id_priv->timeout_ms;
3027         msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT;
3028
3029         spin_lock_irqsave(&cm_id_priv->lock, flags);
3030         if (cm_id->state == IB_CM_IDLE)
3031                 ret = ib_post_send_mad(msg, NULL);
3032         else
3033                 ret = -EINVAL;
3034
3035         if (ret) {
3036                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3037                 cm_free_msg(msg);
3038                 goto out;
3039         }
3040         cm_id->state = IB_CM_SIDR_REQ_SENT;
3041         cm_id_priv->msg = msg;
3042         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3043 out:
3044         return ret;
3045 }
3046 EXPORT_SYMBOL(ib_send_cm_sidr_req);
3047
3048 static void cm_format_sidr_req_event(struct cm_work *work,
3049                                      struct ib_cm_id *listen_id)
3050 {
3051         struct cm_sidr_req_msg *sidr_req_msg;
3052         struct ib_cm_sidr_req_event_param *param;
3053
3054         sidr_req_msg = (struct cm_sidr_req_msg *)
3055                                 work->mad_recv_wc->recv_buf.mad;
3056         param = &work->cm_event.param.sidr_req_rcvd;
3057         param->pkey = __be16_to_cpu(sidr_req_msg->pkey);
3058         param->listen_id = listen_id;
3059         param->service_id = sidr_req_msg->service_id;
3060         param->bth_pkey = cm_get_bth_pkey(work);
3061         param->port = work->port->port_num;
3062         work->cm_event.private_data = &sidr_req_msg->private_data;
3063 }
3064
3065 static int cm_sidr_req_handler(struct cm_work *work)
3066 {
3067         struct ib_cm_id *cm_id;
3068         struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
3069         struct cm_sidr_req_msg *sidr_req_msg;
3070         struct ib_wc *wc;
3071
3072         cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL);
3073         if (IS_ERR(cm_id))
3074                 return PTR_ERR(cm_id);
3075         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3076
3077         /* Record SGID/SLID and request ID for lookup. */
3078         sidr_req_msg = (struct cm_sidr_req_msg *)
3079                                 work->mad_recv_wc->recv_buf.mad;
3080         wc = work->mad_recv_wc->wc;
3081         cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid);
3082         cm_id_priv->av.dgid.global.interface_id = 0;
3083         cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
3084                                 work->mad_recv_wc->recv_buf.grh,
3085                                 &cm_id_priv->av);
3086         cm_id_priv->id.remote_id = sidr_req_msg->request_id;
3087         cm_id_priv->tid = sidr_req_msg->hdr.tid;
3088         atomic_inc(&cm_id_priv->work_count);
3089
3090         spin_lock_irq(&cm.lock);
3091         cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
3092         if (cur_cm_id_priv) {
3093                 spin_unlock_irq(&cm.lock);
3094                 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
3095                                 counter[CM_SIDR_REQ_COUNTER]);
3096                 goto out; /* Duplicate message. */
3097         }
3098         cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
3099         cur_cm_id_priv = cm_find_listen(cm_id->device,
3100                                         sidr_req_msg->service_id);
3101         if (!cur_cm_id_priv) {
3102                 spin_unlock_irq(&cm.lock);
3103                 cm_reject_sidr_req(cm_id_priv, IB_SIDR_UNSUPPORTED);
3104                 goto out; /* No match. */
3105         }
3106         atomic_inc(&cur_cm_id_priv->refcount);
3107         atomic_inc(&cm_id_priv->refcount);
3108         spin_unlock_irq(&cm.lock);
3109
3110         cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler;
3111         cm_id_priv->id.context = cur_cm_id_priv->id.context;
3112         cm_id_priv->id.service_id = sidr_req_msg->service_id;
3113         cm_id_priv->id.service_mask = ~cpu_to_be64(0);
3114
3115         cm_format_sidr_req_event(work, &cur_cm_id_priv->id);
3116         cm_process_work(cm_id_priv, work);
3117         cm_deref_id(cur_cm_id_priv);
3118         return 0;
3119 out:
3120         ib_destroy_cm_id(&cm_id_priv->id);
3121         return -EINVAL;
3122 }
3123
3124 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
3125                                struct cm_id_private *cm_id_priv,
3126                                struct ib_cm_sidr_rep_param *param)
3127 {
3128         cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
3129                           cm_id_priv->tid);
3130         sidr_rep_msg->request_id = cm_id_priv->id.remote_id;
3131         sidr_rep_msg->status = param->status;
3132         cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num));
3133         sidr_rep_msg->service_id = cm_id_priv->id.service_id;
3134         sidr_rep_msg->qkey = cpu_to_be32(param->qkey);
3135
3136         if (param->info && param->info_length)
3137                 memcpy(sidr_rep_msg->info, param->info, param->info_length);
3138
3139         if (param->private_data && param->private_data_len)
3140                 memcpy(sidr_rep_msg->private_data, param->private_data,
3141                        param->private_data_len);
3142 }
3143
3144 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
3145                         struct ib_cm_sidr_rep_param *param)
3146 {
3147         struct cm_id_private *cm_id_priv;
3148         struct ib_mad_send_buf *msg;
3149         unsigned long flags;
3150         int ret;
3151
3152         if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
3153             (param->private_data &&
3154              param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE))
3155                 return -EINVAL;
3156
3157         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3158         spin_lock_irqsave(&cm_id_priv->lock, flags);
3159         if (cm_id->state != IB_CM_SIDR_REQ_RCVD) {
3160                 ret = -EINVAL;
3161                 goto error;
3162         }
3163
3164         ret = cm_alloc_msg(cm_id_priv, &msg);
3165         if (ret)
3166                 goto error;
3167
3168         cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
3169                            param);
3170         ret = ib_post_send_mad(msg, NULL);
3171         if (ret) {
3172                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3173                 cm_free_msg(msg);
3174                 return ret;
3175         }
3176         cm_id->state = IB_CM_IDLE;
3177         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3178
3179         spin_lock_irqsave(&cm.lock, flags);
3180         if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) {
3181                 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
3182                 RB_CLEAR_NODE(&cm_id_priv->sidr_id_node);
3183         }
3184         spin_unlock_irqrestore(&cm.lock, flags);
3185         return 0;
3186
3187 error:  spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3188         return ret;
3189 }
3190 EXPORT_SYMBOL(ib_send_cm_sidr_rep);
3191
3192 static void cm_format_sidr_rep_event(struct cm_work *work)
3193 {
3194         struct cm_sidr_rep_msg *sidr_rep_msg;
3195         struct ib_cm_sidr_rep_event_param *param;
3196
3197         sidr_rep_msg = (struct cm_sidr_rep_msg *)
3198                                 work->mad_recv_wc->recv_buf.mad;
3199         param = &work->cm_event.param.sidr_rep_rcvd;
3200         param->status = sidr_rep_msg->status;
3201         param->qkey = be32_to_cpu(sidr_rep_msg->qkey);
3202         param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg));
3203         param->info = &sidr_rep_msg->info;
3204         param->info_len = sidr_rep_msg->info_length;
3205         work->cm_event.private_data = &sidr_rep_msg->private_data;
3206 }
3207
3208 static int cm_sidr_rep_handler(struct cm_work *work)
3209 {
3210         struct cm_sidr_rep_msg *sidr_rep_msg;
3211         struct cm_id_private *cm_id_priv;
3212
3213         sidr_rep_msg = (struct cm_sidr_rep_msg *)
3214                                 work->mad_recv_wc->recv_buf.mad;
3215         cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0);
3216         if (!cm_id_priv)
3217                 return -EINVAL; /* Unmatched reply. */
3218
3219         spin_lock_irq(&cm_id_priv->lock);
3220         if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
3221                 spin_unlock_irq(&cm_id_priv->lock);
3222                 goto out;
3223         }
3224         cm_id_priv->id.state = IB_CM_IDLE;
3225         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
3226         spin_unlock_irq(&cm_id_priv->lock);
3227
3228         cm_format_sidr_rep_event(work);
3229         cm_process_work(cm_id_priv, work);
3230         return 0;
3231 out:
3232         cm_deref_id(cm_id_priv);
3233         return -EINVAL;
3234 }
3235
3236 static void cm_process_send_error(struct ib_mad_send_buf *msg,
3237                                   enum ib_wc_status wc_status)
3238 {
3239         struct cm_id_private *cm_id_priv;
3240         struct ib_cm_event cm_event;
3241         enum ib_cm_state state;
3242         int ret;
3243
3244         memset(&cm_event, 0, sizeof cm_event);
3245         cm_id_priv = msg->context[0];
3246
3247         /* Discard old sends or ones without a response. */
3248         spin_lock_irq(&cm_id_priv->lock);
3249         state = (enum ib_cm_state) (unsigned long) msg->context[1];
3250         if (msg != cm_id_priv->msg || state != cm_id_priv->id.state)
3251                 goto discard;
3252
3253         switch (state) {
3254         case IB_CM_REQ_SENT:
3255         case IB_CM_MRA_REQ_RCVD:
3256                 cm_reset_to_idle(cm_id_priv);
3257                 cm_event.event = IB_CM_REQ_ERROR;
3258                 break;
3259         case IB_CM_REP_SENT:
3260         case IB_CM_MRA_REP_RCVD:
3261                 cm_reset_to_idle(cm_id_priv);
3262                 cm_event.event = IB_CM_REP_ERROR;
3263                 break;
3264         case IB_CM_DREQ_SENT:
3265                 cm_enter_timewait(cm_id_priv);
3266                 cm_event.event = IB_CM_DREQ_ERROR;
3267                 break;
3268         case IB_CM_SIDR_REQ_SENT:
3269                 cm_id_priv->id.state = IB_CM_IDLE;
3270                 cm_event.event = IB_CM_SIDR_REQ_ERROR;
3271                 break;
3272         default:
3273                 goto discard;
3274         }
3275         spin_unlock_irq(&cm_id_priv->lock);
3276         cm_event.param.send_status = wc_status;
3277
3278         /* No other events can occur on the cm_id at this point. */
3279         ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
3280         cm_free_msg(msg);
3281         if (ret)
3282                 ib_destroy_cm_id(&cm_id_priv->id);
3283         return;
3284 discard:
3285         spin_unlock_irq(&cm_id_priv->lock);
3286         cm_free_msg(msg);
3287 }
3288
3289 static void cm_send_handler(struct ib_mad_agent *mad_agent,
3290                             struct ib_mad_send_wc *mad_send_wc)
3291 {
3292         struct ib_mad_send_buf *msg = mad_send_wc->send_buf;
3293         struct cm_port *port;
3294         u16 attr_index;
3295
3296         port = mad_agent->context;
3297         attr_index = be16_to_cpu(((struct ib_mad_hdr *)
3298                                   msg->mad)->attr_id) - CM_ATTR_ID_OFFSET;
3299
3300         /*
3301          * If the send was in response to a received message (context[0] is not
3302          * set to a cm_id), and is not a REJ, then it is a send that was
3303          * manually retried.
3304          */
3305         if (!msg->context[0] && (attr_index != CM_REJ_COUNTER))
3306                 msg->retries = 1;
3307
3308         atomic_long_add(1 + msg->retries,
3309                         &port->counter_group[CM_XMIT].counter[attr_index]);
3310         if (msg->retries)
3311                 atomic_long_add(msg->retries,
3312                                 &port->counter_group[CM_XMIT_RETRIES].
3313                                 counter[attr_index]);
3314
3315         switch (mad_send_wc->status) {
3316         case IB_WC_SUCCESS:
3317         case IB_WC_WR_FLUSH_ERR:
3318                 cm_free_msg(msg);
3319                 break;
3320         default:
3321                 if (msg->context[0] && msg->context[1])
3322                         cm_process_send_error(msg, mad_send_wc->status);
3323                 else
3324                         cm_free_msg(msg);
3325                 break;
3326         }
3327 }
3328
3329 static void cm_work_handler(struct work_struct *_work)
3330 {
3331         struct cm_work *work = container_of(_work, struct cm_work, work.work);
3332         int ret;
3333
3334         switch (work->cm_event.event) {
3335         case IB_CM_REQ_RECEIVED:
3336                 ret = cm_req_handler(work);
3337                 break;
3338         case IB_CM_MRA_RECEIVED:
3339                 ret = cm_mra_handler(work);
3340                 break;
3341         case IB_CM_REJ_RECEIVED:
3342                 ret = cm_rej_handler(work);
3343                 break;
3344         case IB_CM_REP_RECEIVED:
3345                 ret = cm_rep_handler(work);
3346                 break;
3347         case IB_CM_RTU_RECEIVED:
3348                 ret = cm_rtu_handler(work);
3349                 break;
3350         case IB_CM_USER_ESTABLISHED:
3351                 ret = cm_establish_handler(work);
3352                 break;
3353         case IB_CM_DREQ_RECEIVED:
3354                 ret = cm_dreq_handler(work);
3355                 break;
3356         case IB_CM_DREP_RECEIVED:
3357                 ret = cm_drep_handler(work);
3358                 break;
3359         case IB_CM_SIDR_REQ_RECEIVED:
3360                 ret = cm_sidr_req_handler(work);
3361                 break;
3362         case IB_CM_SIDR_REP_RECEIVED:
3363                 ret = cm_sidr_rep_handler(work);
3364                 break;
3365         case IB_CM_LAP_RECEIVED:
3366                 ret = cm_lap_handler(work);
3367                 break;
3368         case IB_CM_APR_RECEIVED:
3369                 ret = cm_apr_handler(work);
3370                 break;
3371         case IB_CM_TIMEWAIT_EXIT:
3372                 ret = cm_timewait_handler(work);
3373                 break;
3374         default:
3375                 ret = -EINVAL;
3376                 break;
3377         }
3378         if (ret)
3379                 cm_free_work(work);
3380 }
3381
3382 static int cm_establish(struct ib_cm_id *cm_id)
3383 {
3384         struct cm_id_private *cm_id_priv;
3385         struct cm_work *work;
3386         unsigned long flags;
3387         int ret = 0;
3388         struct cm_device *cm_dev;
3389
3390         cm_dev = ib_get_client_data(cm_id->device, &cm_client);
3391         if (!cm_dev)
3392                 return -ENODEV;
3393
3394         work = kmalloc(sizeof *work, GFP_ATOMIC);
3395         if (!work)
3396                 return -ENOMEM;
3397
3398         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3399         spin_lock_irqsave(&cm_id_priv->lock, flags);
3400         switch (cm_id->state)
3401         {
3402         case IB_CM_REP_SENT:
3403         case IB_CM_MRA_REP_RCVD:
3404                 cm_id->state = IB_CM_ESTABLISHED;
3405                 break;
3406         case IB_CM_ESTABLISHED:
3407                 ret = -EISCONN;
3408                 break;
3409         default:
3410                 ret = -EINVAL;
3411                 break;
3412         }
3413         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3414
3415         if (ret) {
3416                 kfree(work);
3417                 goto out;
3418         }
3419
3420         /*
3421          * The CM worker thread may try to destroy the cm_id before it
3422          * can execute this work item.  To prevent potential deadlock,
3423          * we need to find the cm_id once we're in the context of the
3424          * worker thread, rather than holding a reference on it.
3425          */
3426         INIT_DELAYED_WORK(&work->work, cm_work_handler);
3427         work->local_id = cm_id->local_id;
3428         work->remote_id = cm_id->remote_id;
3429         work->mad_recv_wc = NULL;
3430         work->cm_event.event = IB_CM_USER_ESTABLISHED;
3431
3432         /* Check if the device started its remove_one */
3433         spin_lock_irq(&cm.lock);
3434         if (!cm_dev->going_down) {
3435                 queue_delayed_work(cm.wq, &work->work, 0);
3436         } else {
3437                 kfree(work);
3438                 ret = -ENODEV;
3439         }
3440         spin_unlock_irq(&cm.lock);
3441
3442 out:
3443         return ret;
3444 }
3445
3446 static int cm_migrate(struct ib_cm_id *cm_id)
3447 {
3448         struct cm_id_private *cm_id_priv;
3449         unsigned long flags;
3450         int ret = 0;
3451
3452         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3453         spin_lock_irqsave(&cm_id_priv->lock, flags);
3454         if (cm_id->state == IB_CM_ESTABLISHED &&
3455             (cm_id->lap_state == IB_CM_LAP_UNINIT ||
3456              cm_id->lap_state == IB_CM_LAP_IDLE)) {
3457                 cm_id->lap_state = IB_CM_LAP_IDLE;
3458                 cm_id_priv->av = cm_id_priv->alt_av;
3459         } else
3460                 ret = -EINVAL;
3461         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3462
3463         return ret;
3464 }
3465
3466 int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event)
3467 {
3468         int ret;
3469
3470         switch (event) {
3471         case IB_EVENT_COMM_EST:
3472                 ret = cm_establish(cm_id);
3473                 break;
3474         case IB_EVENT_PATH_MIG:
3475                 ret = cm_migrate(cm_id);
3476                 break;
3477         default:
3478                 ret = -EINVAL;
3479         }
3480         return ret;
3481 }
3482 EXPORT_SYMBOL(ib_cm_notify);
3483
3484 static void cm_recv_handler(struct ib_mad_agent *mad_agent,
3485                             struct ib_mad_recv_wc *mad_recv_wc)
3486 {
3487         struct cm_port *port = mad_agent->context;
3488         struct cm_work *work;
3489         enum ib_cm_event_type event;
3490         u16 attr_id;
3491         int paths = 0;
3492         int going_down = 0;
3493
3494         switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
3495         case CM_REQ_ATTR_ID:
3496                 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)->
3497                                                     alt_local_lid != 0);
3498                 event = IB_CM_REQ_RECEIVED;
3499                 break;
3500         case CM_MRA_ATTR_ID:
3501                 event = IB_CM_MRA_RECEIVED;
3502                 break;
3503         case CM_REJ_ATTR_ID:
3504                 event = IB_CM_REJ_RECEIVED;
3505                 break;
3506         case CM_REP_ATTR_ID:
3507                 event = IB_CM_REP_RECEIVED;
3508                 break;
3509         case CM_RTU_ATTR_ID:
3510                 event = IB_CM_RTU_RECEIVED;
3511                 break;
3512         case CM_DREQ_ATTR_ID:
3513                 event = IB_CM_DREQ_RECEIVED;
3514                 break;
3515         case CM_DREP_ATTR_ID:
3516                 event = IB_CM_DREP_RECEIVED;
3517                 break;
3518         case CM_SIDR_REQ_ATTR_ID:
3519                 event = IB_CM_SIDR_REQ_RECEIVED;
3520                 break;
3521         case CM_SIDR_REP_ATTR_ID:
3522                 event = IB_CM_SIDR_REP_RECEIVED;
3523                 break;
3524         case CM_LAP_ATTR_ID:
3525                 paths = 1;
3526                 event = IB_CM_LAP_RECEIVED;
3527                 break;
3528         case CM_APR_ATTR_ID:
3529                 event = IB_CM_APR_RECEIVED;
3530                 break;
3531         default:
3532                 ib_free_recv_mad(mad_recv_wc);
3533                 return;
3534         }
3535
3536         attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id);
3537         atomic_long_inc(&port->counter_group[CM_RECV].
3538                         counter[attr_id - CM_ATTR_ID_OFFSET]);
3539
3540         work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths,
3541                        GFP_KERNEL);
3542         if (!work) {
3543                 ib_free_recv_mad(mad_recv_wc);
3544                 return;
3545         }
3546
3547         INIT_DELAYED_WORK(&work->work, cm_work_handler);
3548         work->cm_event.event = event;
3549         work->mad_recv_wc = mad_recv_wc;
3550         work->port = port;
3551
3552         /* Check if the device started its remove_one */
3553         spin_lock_irq(&cm.lock);
3554         if (!port->cm_dev->going_down)
3555                 queue_delayed_work(cm.wq, &work->work, 0);
3556         else
3557                 going_down = 1;
3558         spin_unlock_irq(&cm.lock);
3559
3560         if (going_down) {
3561                 kfree(work);
3562                 ib_free_recv_mad(mad_recv_wc);
3563         }
3564 }
3565
3566 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
3567                                 struct ib_qp_attr *qp_attr,
3568                                 int *qp_attr_mask)
3569 {
3570         unsigned long flags;
3571         int ret;
3572
3573         spin_lock_irqsave(&cm_id_priv->lock, flags);
3574         switch (cm_id_priv->id.state) {
3575         case IB_CM_REQ_SENT:
3576         case IB_CM_MRA_REQ_RCVD:
3577         case IB_CM_REQ_RCVD:
3578         case IB_CM_MRA_REQ_SENT:
3579         case IB_CM_REP_RCVD:
3580         case IB_CM_MRA_REP_SENT:
3581         case IB_CM_REP_SENT:
3582         case IB_CM_MRA_REP_RCVD:
3583         case IB_CM_ESTABLISHED:
3584                 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
3585                                 IB_QP_PKEY_INDEX | IB_QP_PORT;
3586                 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE;
3587                 if (cm_id_priv->responder_resources)
3588                         qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ |
3589                                                     IB_ACCESS_REMOTE_ATOMIC;
3590                 qp_attr->pkey_index = cm_id_priv->av.pkey_index;
3591                 qp_attr->port_num = cm_id_priv->av.port->port_num;
3592                 ret = 0;
3593                 break;
3594         default:
3595                 ret = -EINVAL;
3596                 break;
3597         }
3598         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3599         return ret;
3600 }
3601
3602 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
3603                                struct ib_qp_attr *qp_attr,
3604                                int *qp_attr_mask)
3605 {
3606         unsigned long flags;
3607         int ret;
3608
3609         spin_lock_irqsave(&cm_id_priv->lock, flags);
3610         switch (cm_id_priv->id.state) {
3611         case IB_CM_REQ_RCVD:
3612         case IB_CM_MRA_REQ_SENT:
3613         case IB_CM_REP_RCVD:
3614         case IB_CM_MRA_REP_SENT:
3615         case IB_CM_REP_SENT:
3616         case IB_CM_MRA_REP_RCVD:
3617         case IB_CM_ESTABLISHED:
3618                 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
3619                                 IB_QP_DEST_QPN | IB_QP_RQ_PSN;
3620                 qp_attr->ah_attr = cm_id_priv->av.ah_attr;
3621                 qp_attr->path_mtu = cm_id_priv->path_mtu;
3622                 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
3623                 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
3624                 if (cm_id_priv->qp_type == IB_QPT_RC ||
3625                     cm_id_priv->qp_type == IB_QPT_XRC_TGT) {
3626                         *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC |
3627                                          IB_QP_MIN_RNR_TIMER;
3628                         qp_attr->max_dest_rd_atomic =
3629                                         cm_id_priv->responder_resources;
3630                         qp_attr->min_rnr_timer = 0;
3631                 }
3632                 if (cm_id_priv->alt_av.ah_attr.dlid) {
3633                         *qp_attr_mask |= IB_QP_ALT_PATH;
3634                         qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
3635                         qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
3636                         qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
3637                         qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3638                 }
3639                 ret = 0;
3640                 break;
3641         default:
3642                 ret = -EINVAL;
3643                 break;
3644         }
3645         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3646         return ret;
3647 }
3648
3649 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv,
3650                                struct ib_qp_attr *qp_attr,
3651                                int *qp_attr_mask)
3652 {
3653         unsigned long flags;
3654         int ret;
3655
3656         spin_lock_irqsave(&cm_id_priv->lock, flags);
3657         switch (cm_id_priv->id.state) {
3658         /* Allow transition to RTS before sending REP */
3659         case IB_CM_REQ_RCVD:
3660         case IB_CM_MRA_REQ_SENT:
3661
3662         case IB_CM_REP_RCVD:
3663         case IB_CM_MRA_REP_SENT:
3664         case IB_CM_REP_SENT:
3665         case IB_CM_MRA_REP_RCVD:
3666         case IB_CM_ESTABLISHED:
3667                 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) {
3668                         *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN;
3669                         qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn);
3670                         switch (cm_id_priv->qp_type) {
3671                         case IB_QPT_RC:
3672                         case IB_QPT_XRC_INI:
3673                                 *qp_attr_mask |= IB_QP_RETRY_CNT | IB_QP_RNR_RETRY |
3674                                                  IB_QP_MAX_QP_RD_ATOMIC;
3675                                 qp_attr->retry_cnt = cm_id_priv->retry_count;
3676                                 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count;
3677                                 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth;
3678                                 /* fall through */
3679                         case IB_QPT_XRC_TGT:
3680                                 *qp_attr_mask |= IB_QP_TIMEOUT;
3681                                 qp_attr->timeout = cm_id_priv->av.timeout;
3682                                 break;
3683                         default:
3684                                 break;
3685                         }
3686                         if (cm_id_priv->alt_av.ah_attr.dlid) {
3687                                 *qp_attr_mask |= IB_QP_PATH_MIG_STATE;
3688                                 qp_attr->path_mig_state = IB_MIG_REARM;
3689                         }
3690                 } else {
3691                         *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE;
3692                         qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
3693                         qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
3694                         qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
3695                         qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3696                         qp_attr->path_mig_state = IB_MIG_REARM;
3697                 }
3698                 ret = 0;
3699                 break;
3700         default:
3701                 ret = -EINVAL;
3702                 break;
3703         }
3704         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3705         return ret;
3706 }
3707
3708 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
3709                        struct ib_qp_attr *qp_attr,
3710                        int *qp_attr_mask)
3711 {
3712         struct cm_id_private *cm_id_priv;
3713         int ret;
3714
3715         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3716         switch (qp_attr->qp_state) {
3717         case IB_QPS_INIT:
3718                 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask);
3719                 break;
3720         case IB_QPS_RTR:
3721                 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask);
3722                 break;
3723         case IB_QPS_RTS:
3724                 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask);
3725                 break;
3726         default:
3727                 ret = -EINVAL;
3728                 break;
3729         }
3730         return ret;
3731 }
3732 EXPORT_SYMBOL(ib_cm_init_qp_attr);
3733
3734 static void cm_get_ack_delay(struct cm_device *cm_dev)
3735 {
3736         struct ib_device_attr attr;
3737
3738         if (ib_query_device(cm_dev->ib_device, &attr))
3739                 cm_dev->ack_delay = 0; /* acks will rely on packet life time */
3740         else
3741                 cm_dev->ack_delay = attr.local_ca_ack_delay;
3742 }
3743
3744 static ssize_t cm_show_counter(struct kobject *obj, struct attribute *attr,
3745                                char *buf)
3746 {
3747         struct cm_counter_group *group;
3748         struct cm_counter_attribute *cm_attr;
3749
3750         group = container_of(obj, struct cm_counter_group, obj);
3751         cm_attr = container_of(attr, struct cm_counter_attribute, attr);
3752
3753         return sprintf(buf, "%ld\n",
3754                        atomic_long_read(&group->counter[cm_attr->index]));
3755 }
3756
3757 static const struct sysfs_ops cm_counter_ops = {
3758         .show = cm_show_counter
3759 };
3760
3761 static struct kobj_type cm_counter_obj_type = {
3762         .sysfs_ops = &cm_counter_ops,
3763         .default_attrs = cm_counter_default_attrs
3764 };
3765
3766 static void cm_release_port_obj(struct kobject *obj)
3767 {
3768         struct cm_port *cm_port;
3769
3770         cm_port = container_of(obj, struct cm_port, port_obj);
3771         kfree(cm_port);
3772 }
3773
3774 static struct kobj_type cm_port_obj_type = {
3775         .release = cm_release_port_obj
3776 };
3777
3778 static char *cm_devnode(struct device *dev, umode_t *mode)
3779 {
3780         if (mode)
3781                 *mode = 0666;
3782         return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
3783 }
3784
3785 struct class cm_class = {
3786         .owner   = THIS_MODULE,
3787         .name    = "infiniband_cm",
3788         .devnode = cm_devnode,
3789 };
3790 EXPORT_SYMBOL(cm_class);
3791
3792 static int cm_create_port_fs(struct cm_port *port)
3793 {
3794         int i, ret;
3795
3796         ret = kobject_init_and_add(&port->port_obj, &cm_port_obj_type,
3797                                    &port->cm_dev->device->kobj,
3798                                    "%d", port->port_num);
3799         if (ret) {
3800                 kfree(port);
3801                 return ret;
3802         }
3803
3804         for (i = 0; i < CM_COUNTER_GROUPS; i++) {
3805                 ret = kobject_init_and_add(&port->counter_group[i].obj,
3806                                            &cm_counter_obj_type,
3807                                            &port->port_obj,
3808                                            "%s", counter_group_names[i]);
3809                 if (ret)
3810                         goto error;
3811         }
3812
3813         return 0;
3814
3815 error:
3816         while (i--)
3817                 kobject_put(&port->counter_group[i].obj);
3818         kobject_put(&port->port_obj);
3819         return ret;
3820
3821 }
3822
3823 static void cm_remove_port_fs(struct cm_port *port)
3824 {
3825         int i;
3826
3827         for (i = 0; i < CM_COUNTER_GROUPS; i++)
3828                 kobject_put(&port->counter_group[i].obj);
3829
3830         kobject_put(&port->port_obj);
3831 }
3832
3833 static void cm_add_one(struct ib_device *ib_device)
3834 {
3835         struct cm_device *cm_dev;
3836         struct cm_port *port;
3837         struct ib_mad_reg_req reg_req = {
3838                 .mgmt_class = IB_MGMT_CLASS_CM,
3839                 .mgmt_class_version = IB_CM_CLASS_VERSION,
3840         };
3841         struct ib_port_modify port_modify = {
3842                 .set_port_cap_mask = IB_PORT_CM_SUP
3843         };
3844         unsigned long flags;
3845         int ret;
3846         int count = 0;
3847         u8 i;
3848
3849         cm_dev = kzalloc(sizeof(*cm_dev) + sizeof(*port) *
3850                          ib_device->phys_port_cnt, GFP_KERNEL);
3851         if (!cm_dev)
3852                 return;
3853
3854         cm_dev->ib_device = ib_device;
3855         cm_get_ack_delay(cm_dev);
3856         cm_dev->going_down = 0;
3857         cm_dev->device = device_create(&cm_class, &ib_device->dev,
3858                                        MKDEV(0, 0), NULL,
3859                                        "%s", ib_device->name);
3860         if (IS_ERR(cm_dev->device)) {
3861                 kfree(cm_dev);
3862                 return;
3863         }
3864
3865         set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
3866         for (i = 1; i <= ib_device->phys_port_cnt; i++) {
3867                 if (!rdma_cap_ib_cm(ib_device, i))
3868                         continue;
3869
3870                 port = kzalloc(sizeof *port, GFP_KERNEL);
3871                 if (!port)
3872                         goto error1;
3873
3874                 cm_dev->port[i-1] = port;
3875                 port->cm_dev = cm_dev;
3876                 port->port_num = i;
3877
3878                 ret = cm_create_port_fs(port);
3879                 if (ret)
3880                         goto error1;
3881
3882                 port->mad_agent = ib_register_mad_agent(ib_device, i,
3883                                                         IB_QPT_GSI,
3884                                                         &reg_req,
3885                                                         0,
3886                                                         cm_send_handler,
3887                                                         cm_recv_handler,
3888                                                         port,
3889                                                         0);
3890                 if (IS_ERR(port->mad_agent))
3891                         goto error2;
3892
3893                 ret = ib_modify_port(ib_device, i, 0, &port_modify);
3894                 if (ret)
3895                         goto error3;
3896
3897                 count++;
3898         }
3899
3900         if (!count)
3901                 goto free;
3902
3903         ib_set_client_data(ib_device, &cm_client, cm_dev);
3904
3905         write_lock_irqsave(&cm.device_lock, flags);
3906         list_add_tail(&cm_dev->list, &cm.device_list);
3907         write_unlock_irqrestore(&cm.device_lock, flags);
3908         return;
3909
3910 error3:
3911         ib_unregister_mad_agent(port->mad_agent);
3912 error2:
3913         cm_remove_port_fs(port);
3914 error1:
3915         port_modify.set_port_cap_mask = 0;
3916         port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
3917         while (--i) {
3918                 if (!rdma_cap_ib_cm(ib_device, i))
3919                         continue;
3920
3921                 port = cm_dev->port[i-1];
3922                 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
3923                 ib_unregister_mad_agent(port->mad_agent);
3924                 cm_remove_port_fs(port);
3925         }
3926 free:
3927         device_unregister(cm_dev->device);
3928         kfree(cm_dev);
3929 }
3930
3931 static void cm_remove_one(struct ib_device *ib_device, void *client_data)
3932 {
3933         struct cm_device *cm_dev = client_data;
3934         struct cm_port *port;
3935         struct ib_port_modify port_modify = {
3936                 .clr_port_cap_mask = IB_PORT_CM_SUP
3937         };
3938         unsigned long flags;
3939         int i;
3940
3941         if (!cm_dev)
3942                 return;
3943
3944         write_lock_irqsave(&cm.device_lock, flags);
3945         list_del(&cm_dev->list);
3946         write_unlock_irqrestore(&cm.device_lock, flags);
3947
3948         spin_lock_irq(&cm.lock);
3949         cm_dev->going_down = 1;
3950         spin_unlock_irq(&cm.lock);
3951
3952         for (i = 1; i <= ib_device->phys_port_cnt; i++) {
3953                 if (!rdma_cap_ib_cm(ib_device, i))
3954                         continue;
3955
3956                 port = cm_dev->port[i-1];
3957                 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
3958                 /*
3959                  * We flush the queue here after the going_down set, this
3960                  * verify that no new works will be queued in the recv handler,
3961                  * after that we can call the unregister_mad_agent
3962                  */
3963                 flush_workqueue(cm.wq);
3964                 ib_unregister_mad_agent(port->mad_agent);
3965                 cm_remove_port_fs(port);
3966         }
3967         device_unregister(cm_dev->device);
3968         kfree(cm_dev);
3969 }
3970
3971 static int __init ib_cm_init(void)
3972 {
3973         int ret;
3974
3975         memset(&cm, 0, sizeof cm);
3976         INIT_LIST_HEAD(&cm.device_list);
3977         rwlock_init(&cm.device_lock);
3978         spin_lock_init(&cm.lock);
3979         cm.listen_service_table = RB_ROOT;
3980         cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID);
3981         cm.remote_id_table = RB_ROOT;
3982         cm.remote_qp_table = RB_ROOT;
3983         cm.remote_sidr_table = RB_ROOT;
3984         idr_init(&cm.local_id_table);
3985         get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand);
3986         INIT_LIST_HEAD(&cm.timewait_list);
3987
3988         ret = class_register(&cm_class);
3989         if (ret) {
3990                 ret = -ENOMEM;
3991                 goto error1;
3992         }
3993
3994         cm.wq = create_workqueue("ib_cm");
3995         if (!cm.wq) {
3996                 ret = -ENOMEM;
3997                 goto error2;
3998         }
3999
4000         ret = ib_register_client(&cm_client);
4001         if (ret)
4002                 goto error3;
4003
4004         return 0;
4005 error3:
4006         destroy_workqueue(cm.wq);
4007 error2:
4008         class_unregister(&cm_class);
4009 error1:
4010         idr_destroy(&cm.local_id_table);
4011         return ret;
4012 }
4013
4014 static void __exit ib_cm_cleanup(void)
4015 {
4016         struct cm_timewait_info *timewait_info, *tmp;
4017
4018         spin_lock_irq(&cm.lock);
4019         list_for_each_entry(timewait_info, &cm.timewait_list, list)
4020                 cancel_delayed_work(&timewait_info->work.work);
4021         spin_unlock_irq(&cm.lock);
4022
4023         ib_unregister_client(&cm_client);
4024         destroy_workqueue(cm.wq);
4025
4026         list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) {
4027                 list_del(&timewait_info->list);
4028                 kfree(timewait_info);
4029         }
4030
4031         class_unregister(&cm_class);
4032         idr_destroy(&cm.local_id_table);
4033 }
4034
4035 module_init(ib_cm_init);
4036 module_exit(ib_cm_cleanup);
4037