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                                         path->gid_type, 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         union ib_gid gid;
1604         struct ib_gid_attr gid_attr;
1605         int ret;
1606
1607         req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1608
1609         cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL);
1610         if (IS_ERR(cm_id))
1611                 return PTR_ERR(cm_id);
1612
1613         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1614         cm_id_priv->id.remote_id = req_msg->local_comm_id;
1615         cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
1616                                 work->mad_recv_wc->recv_buf.grh,
1617                                 &cm_id_priv->av);
1618         cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1619                                                             id.local_id);
1620         if (IS_ERR(cm_id_priv->timewait_info)) {
1621                 ret = PTR_ERR(cm_id_priv->timewait_info);
1622                 goto destroy;
1623         }
1624         cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id;
1625         cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid;
1626         cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg);
1627
1628         listen_cm_id_priv = cm_match_req(work, cm_id_priv);
1629         if (!listen_cm_id_priv) {
1630                 ret = -EINVAL;
1631                 kfree(cm_id_priv->timewait_info);
1632                 goto destroy;
1633         }
1634
1635         cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
1636         cm_id_priv->id.context = listen_cm_id_priv->id.context;
1637         cm_id_priv->id.service_id = req_msg->service_id;
1638         cm_id_priv->id.service_mask = ~cpu_to_be64(0);
1639
1640         cm_process_routed_req(req_msg, work->mad_recv_wc->wc);
1641         cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]);
1642
1643         memcpy(work->path[0].dmac, cm_id_priv->av.ah_attr.dmac, ETH_ALEN);
1644         work->path[0].hop_limit = cm_id_priv->av.ah_attr.grh.hop_limit;
1645         ret = ib_get_cached_gid(work->port->cm_dev->ib_device,
1646                                 work->port->port_num,
1647                                 cm_id_priv->av.ah_attr.grh.sgid_index,
1648                                 &gid, &gid_attr);
1649         if (!ret) {
1650                 if (gid_attr.ndev) {
1651                         work->path[0].ifindex = gid_attr.ndev->ifindex;
1652                         work->path[0].net = dev_net(gid_attr.ndev);
1653                         dev_put(gid_attr.ndev);
1654                 }
1655                 work->path[0].gid_type = gid_attr.gid_type;
1656                 ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av);
1657         }
1658         if (ret) {
1659                 int err = ib_get_cached_gid(work->port->cm_dev->ib_device,
1660                                             work->port->port_num, 0,
1661                                             &work->path[0].sgid,
1662                                             &gid_attr);
1663                 if (!err && gid_attr.ndev) {
1664                         work->path[0].ifindex = gid_attr.ndev->ifindex;
1665                         work->path[0].net = dev_net(gid_attr.ndev);
1666                         dev_put(gid_attr.ndev);
1667                 }
1668                 work->path[0].gid_type = gid_attr.gid_type;
1669                 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID,
1670                                &work->path[0].sgid, sizeof work->path[0].sgid,
1671                                NULL, 0);
1672                 goto rejected;
1673         }
1674         if (req_msg->alt_local_lid) {
1675                 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av);
1676                 if (ret) {
1677                         ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID,
1678                                        &work->path[0].sgid,
1679                                        sizeof work->path[0].sgid, NULL, 0);
1680                         goto rejected;
1681                 }
1682         }
1683         cm_id_priv->tid = req_msg->hdr.tid;
1684         cm_id_priv->timeout_ms = cm_convert_to_ms(
1685                                         cm_req_get_local_resp_timeout(req_msg));
1686         cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg);
1687         cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg);
1688         cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg);
1689         cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg);
1690         cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg);
1691         cm_id_priv->pkey = req_msg->pkey;
1692         cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg);
1693         cm_id_priv->retry_count = cm_req_get_retry_count(req_msg);
1694         cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1695         cm_id_priv->qp_type = cm_req_get_qp_type(req_msg);
1696
1697         cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
1698         cm_process_work(cm_id_priv, work);
1699         cm_deref_id(listen_cm_id_priv);
1700         return 0;
1701
1702 rejected:
1703         atomic_dec(&cm_id_priv->refcount);
1704         cm_deref_id(listen_cm_id_priv);
1705 destroy:
1706         ib_destroy_cm_id(cm_id);
1707         return ret;
1708 }
1709
1710 static void cm_format_rep(struct cm_rep_msg *rep_msg,
1711                           struct cm_id_private *cm_id_priv,
1712                           struct ib_cm_rep_param *param)
1713 {
1714         cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid);
1715         rep_msg->local_comm_id = cm_id_priv->id.local_id;
1716         rep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1717         cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn));
1718         rep_msg->resp_resources = param->responder_resources;
1719         cm_rep_set_target_ack_delay(rep_msg,
1720                                     cm_id_priv->av.port->cm_dev->ack_delay);
1721         cm_rep_set_failover(rep_msg, param->failover_accepted);
1722         cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count);
1723         rep_msg->local_ca_guid = cm_id_priv->id.device->node_guid;
1724
1725         if (cm_id_priv->qp_type != IB_QPT_XRC_TGT) {
1726                 rep_msg->initiator_depth = param->initiator_depth;
1727                 cm_rep_set_flow_ctrl(rep_msg, param->flow_control);
1728                 cm_rep_set_srq(rep_msg, param->srq);
1729                 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num));
1730         } else {
1731                 cm_rep_set_srq(rep_msg, 1);
1732                 cm_rep_set_local_eecn(rep_msg, cpu_to_be32(param->qp_num));
1733         }
1734
1735         if (param->private_data && param->private_data_len)
1736                 memcpy(rep_msg->private_data, param->private_data,
1737                        param->private_data_len);
1738 }
1739
1740 int ib_send_cm_rep(struct ib_cm_id *cm_id,
1741                    struct ib_cm_rep_param *param)
1742 {
1743         struct cm_id_private *cm_id_priv;
1744         struct ib_mad_send_buf *msg;
1745         struct cm_rep_msg *rep_msg;
1746         unsigned long flags;
1747         int ret;
1748
1749         if (param->private_data &&
1750             param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE)
1751                 return -EINVAL;
1752
1753         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1754         spin_lock_irqsave(&cm_id_priv->lock, flags);
1755         if (cm_id->state != IB_CM_REQ_RCVD &&
1756             cm_id->state != IB_CM_MRA_REQ_SENT) {
1757                 ret = -EINVAL;
1758                 goto out;
1759         }
1760
1761         ret = cm_alloc_msg(cm_id_priv, &msg);
1762         if (ret)
1763                 goto out;
1764
1765         rep_msg = (struct cm_rep_msg *) msg->mad;
1766         cm_format_rep(rep_msg, cm_id_priv, param);
1767         msg->timeout_ms = cm_id_priv->timeout_ms;
1768         msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;
1769
1770         ret = ib_post_send_mad(msg, NULL);
1771         if (ret) {
1772                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1773                 cm_free_msg(msg);
1774                 return ret;
1775         }
1776
1777         cm_id->state = IB_CM_REP_SENT;
1778         cm_id_priv->msg = msg;
1779         cm_id_priv->initiator_depth = param->initiator_depth;
1780         cm_id_priv->responder_resources = param->responder_resources;
1781         cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg);
1782         cm_id_priv->local_qpn = cpu_to_be32(param->qp_num & 0xFFFFFF);
1783
1784 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1785         return ret;
1786 }
1787 EXPORT_SYMBOL(ib_send_cm_rep);
1788
1789 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg,
1790                           struct cm_id_private *cm_id_priv,
1791                           const void *private_data,
1792                           u8 private_data_len)
1793 {
1794         cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid);
1795         rtu_msg->local_comm_id = cm_id_priv->id.local_id;
1796         rtu_msg->remote_comm_id = cm_id_priv->id.remote_id;
1797
1798         if (private_data && private_data_len)
1799                 memcpy(rtu_msg->private_data, private_data, private_data_len);
1800 }
1801
1802 int ib_send_cm_rtu(struct ib_cm_id *cm_id,
1803                    const void *private_data,
1804                    u8 private_data_len)
1805 {
1806         struct cm_id_private *cm_id_priv;
1807         struct ib_mad_send_buf *msg;
1808         unsigned long flags;
1809         void *data;
1810         int ret;
1811
1812         if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE)
1813                 return -EINVAL;
1814
1815         data = cm_copy_private_data(private_data, private_data_len);
1816         if (IS_ERR(data))
1817                 return PTR_ERR(data);
1818
1819         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1820         spin_lock_irqsave(&cm_id_priv->lock, flags);
1821         if (cm_id->state != IB_CM_REP_RCVD &&
1822             cm_id->state != IB_CM_MRA_REP_SENT) {
1823                 ret = -EINVAL;
1824                 goto error;
1825         }
1826
1827         ret = cm_alloc_msg(cm_id_priv, &msg);
1828         if (ret)
1829                 goto error;
1830
1831         cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1832                       private_data, private_data_len);
1833
1834         ret = ib_post_send_mad(msg, NULL);
1835         if (ret) {
1836                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1837                 cm_free_msg(msg);
1838                 kfree(data);
1839                 return ret;
1840         }
1841
1842         cm_id->state = IB_CM_ESTABLISHED;
1843         cm_set_private_data(cm_id_priv, data, private_data_len);
1844         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1845         return 0;
1846
1847 error:  spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1848         kfree(data);
1849         return ret;
1850 }
1851 EXPORT_SYMBOL(ib_send_cm_rtu);
1852
1853 static void cm_format_rep_event(struct cm_work *work, enum ib_qp_type qp_type)
1854 {
1855         struct cm_rep_msg *rep_msg;
1856         struct ib_cm_rep_event_param *param;
1857
1858         rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1859         param = &work->cm_event.param.rep_rcvd;
1860         param->remote_ca_guid = rep_msg->local_ca_guid;
1861         param->remote_qkey = be32_to_cpu(rep_msg->local_qkey);
1862         param->remote_qpn = be32_to_cpu(cm_rep_get_qpn(rep_msg, qp_type));
1863         param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg));
1864         param->responder_resources = rep_msg->initiator_depth;
1865         param->initiator_depth = rep_msg->resp_resources;
1866         param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
1867         param->failover_accepted = cm_rep_get_failover(rep_msg);
1868         param->flow_control = cm_rep_get_flow_ctrl(rep_msg);
1869         param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1870         param->srq = cm_rep_get_srq(rep_msg);
1871         work->cm_event.private_data = &rep_msg->private_data;
1872 }
1873
1874 static void cm_dup_rep_handler(struct cm_work *work)
1875 {
1876         struct cm_id_private *cm_id_priv;
1877         struct cm_rep_msg *rep_msg;
1878         struct ib_mad_send_buf *msg = NULL;
1879         int ret;
1880
1881         rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad;
1882         cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id,
1883                                    rep_msg->local_comm_id);
1884         if (!cm_id_priv)
1885                 return;
1886
1887         atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
1888                         counter[CM_REP_COUNTER]);
1889         ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1890         if (ret)
1891                 goto deref;
1892
1893         spin_lock_irq(&cm_id_priv->lock);
1894         if (cm_id_priv->id.state == IB_CM_ESTABLISHED)
1895                 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1896                               cm_id_priv->private_data,
1897                               cm_id_priv->private_data_len);
1898         else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT)
1899                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1900                               CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout,
1901                               cm_id_priv->private_data,
1902                               cm_id_priv->private_data_len);
1903         else
1904                 goto unlock;
1905         spin_unlock_irq(&cm_id_priv->lock);
1906
1907         ret = ib_post_send_mad(msg, NULL);
1908         if (ret)
1909                 goto free;
1910         goto deref;
1911
1912 unlock: spin_unlock_irq(&cm_id_priv->lock);
1913 free:   cm_free_msg(msg);
1914 deref:  cm_deref_id(cm_id_priv);
1915 }
1916
1917 static int cm_rep_handler(struct cm_work *work)
1918 {
1919         struct cm_id_private *cm_id_priv;
1920         struct cm_rep_msg *rep_msg;
1921         int ret;
1922
1923         rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1924         cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0);
1925         if (!cm_id_priv) {
1926                 cm_dup_rep_handler(work);
1927                 return -EINVAL;
1928         }
1929
1930         cm_format_rep_event(work, cm_id_priv->qp_type);
1931
1932         spin_lock_irq(&cm_id_priv->lock);
1933         switch (cm_id_priv->id.state) {
1934         case IB_CM_REQ_SENT:
1935         case IB_CM_MRA_REQ_RCVD:
1936                 break;
1937         default:
1938                 spin_unlock_irq(&cm_id_priv->lock);
1939                 ret = -EINVAL;
1940                 goto error;
1941         }
1942
1943         cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id;
1944         cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid;
1945         cm_id_priv->timewait_info->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type);
1946
1947         spin_lock(&cm.lock);
1948         /* Check for duplicate REP. */
1949         if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
1950                 spin_unlock(&cm.lock);
1951                 spin_unlock_irq(&cm_id_priv->lock);
1952                 ret = -EINVAL;
1953                 goto error;
1954         }
1955         /* Check for a stale connection. */
1956         if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) {
1957                 rb_erase(&cm_id_priv->timewait_info->remote_id_node,
1958                          &cm.remote_id_table);
1959                 cm_id_priv->timewait_info->inserted_remote_id = 0;
1960                 spin_unlock(&cm.lock);
1961                 spin_unlock_irq(&cm_id_priv->lock);
1962                 cm_issue_rej(work->port, work->mad_recv_wc,
1963                              IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP,
1964                              NULL, 0);
1965                 ret = -EINVAL;
1966                 goto error;
1967         }
1968         spin_unlock(&cm.lock);
1969
1970         cm_id_priv->id.state = IB_CM_REP_RCVD;
1971         cm_id_priv->id.remote_id = rep_msg->local_comm_id;
1972         cm_id_priv->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type);
1973         cm_id_priv->initiator_depth = rep_msg->resp_resources;
1974         cm_id_priv->responder_resources = rep_msg->initiator_depth;
1975         cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg);
1976         cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1977         cm_id_priv->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
1978         cm_id_priv->av.timeout =
1979                         cm_ack_timeout(cm_id_priv->target_ack_delay,
1980                                        cm_id_priv->av.timeout - 1);
1981         cm_id_priv->alt_av.timeout =
1982                         cm_ack_timeout(cm_id_priv->target_ack_delay,
1983                                        cm_id_priv->alt_av.timeout - 1);
1984
1985         /* todo: handle peer_to_peer */
1986
1987         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1988         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1989         if (!ret)
1990                 list_add_tail(&work->list, &cm_id_priv->work_list);
1991         spin_unlock_irq(&cm_id_priv->lock);
1992
1993         if (ret)
1994                 cm_process_work(cm_id_priv, work);
1995         else
1996                 cm_deref_id(cm_id_priv);
1997         return 0;
1998
1999 error:
2000         cm_deref_id(cm_id_priv);
2001         return ret;
2002 }
2003
2004 static int cm_establish_handler(struct cm_work *work)
2005 {
2006         struct cm_id_private *cm_id_priv;
2007         int ret;
2008
2009         /* See comment in cm_establish about lookup. */
2010         cm_id_priv = cm_acquire_id(work->local_id, work->remote_id);
2011         if (!cm_id_priv)
2012                 return -EINVAL;
2013
2014         spin_lock_irq(&cm_id_priv->lock);
2015         if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
2016                 spin_unlock_irq(&cm_id_priv->lock);
2017                 goto out;
2018         }
2019
2020         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2021         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2022         if (!ret)
2023                 list_add_tail(&work->list, &cm_id_priv->work_list);
2024         spin_unlock_irq(&cm_id_priv->lock);
2025
2026         if (ret)
2027                 cm_process_work(cm_id_priv, work);
2028         else
2029                 cm_deref_id(cm_id_priv);
2030         return 0;
2031 out:
2032         cm_deref_id(cm_id_priv);
2033         return -EINVAL;
2034 }
2035
2036 static int cm_rtu_handler(struct cm_work *work)
2037 {
2038         struct cm_id_private *cm_id_priv;
2039         struct cm_rtu_msg *rtu_msg;
2040         int ret;
2041
2042         rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad;
2043         cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id,
2044                                    rtu_msg->local_comm_id);
2045         if (!cm_id_priv)
2046                 return -EINVAL;
2047
2048         work->cm_event.private_data = &rtu_msg->private_data;
2049
2050         spin_lock_irq(&cm_id_priv->lock);
2051         if (cm_id_priv->id.state != IB_CM_REP_SENT &&
2052             cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
2053                 spin_unlock_irq(&cm_id_priv->lock);
2054                 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2055                                 counter[CM_RTU_COUNTER]);
2056                 goto out;
2057         }
2058         cm_id_priv->id.state = IB_CM_ESTABLISHED;
2059
2060         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2061         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2062         if (!ret)
2063                 list_add_tail(&work->list, &cm_id_priv->work_list);
2064         spin_unlock_irq(&cm_id_priv->lock);
2065
2066         if (ret)
2067                 cm_process_work(cm_id_priv, work);
2068         else
2069                 cm_deref_id(cm_id_priv);
2070         return 0;
2071 out:
2072         cm_deref_id(cm_id_priv);
2073         return -EINVAL;
2074 }
2075
2076 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg,
2077                           struct cm_id_private *cm_id_priv,
2078                           const void *private_data,
2079                           u8 private_data_len)
2080 {
2081         cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID,
2082                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ));
2083         dreq_msg->local_comm_id = cm_id_priv->id.local_id;
2084         dreq_msg->remote_comm_id = cm_id_priv->id.remote_id;
2085         cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn);
2086
2087         if (private_data && private_data_len)
2088                 memcpy(dreq_msg->private_data, private_data, private_data_len);
2089 }
2090
2091 int ib_send_cm_dreq(struct ib_cm_id *cm_id,
2092                     const void *private_data,
2093                     u8 private_data_len)
2094 {
2095         struct cm_id_private *cm_id_priv;
2096         struct ib_mad_send_buf *msg;
2097         unsigned long flags;
2098         int ret;
2099
2100         if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE)
2101                 return -EINVAL;
2102
2103         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2104         spin_lock_irqsave(&cm_id_priv->lock, flags);
2105         if (cm_id->state != IB_CM_ESTABLISHED) {
2106                 ret = -EINVAL;
2107                 goto out;
2108         }
2109
2110         if (cm_id->lap_state == IB_CM_LAP_SENT ||
2111             cm_id->lap_state == IB_CM_MRA_LAP_RCVD)
2112                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2113
2114         ret = cm_alloc_msg(cm_id_priv, &msg);
2115         if (ret) {
2116                 cm_enter_timewait(cm_id_priv);
2117                 goto out;
2118         }
2119
2120         cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv,
2121                        private_data, private_data_len);
2122         msg->timeout_ms = cm_id_priv->timeout_ms;
2123         msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
2124
2125         ret = ib_post_send_mad(msg, NULL);
2126         if (ret) {
2127                 cm_enter_timewait(cm_id_priv);
2128                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2129                 cm_free_msg(msg);
2130                 return ret;
2131         }
2132
2133         cm_id->state = IB_CM_DREQ_SENT;
2134         cm_id_priv->msg = msg;
2135 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2136         return ret;
2137 }
2138 EXPORT_SYMBOL(ib_send_cm_dreq);
2139
2140 static void cm_format_drep(struct cm_drep_msg *drep_msg,
2141                           struct cm_id_private *cm_id_priv,
2142                           const void *private_data,
2143                           u8 private_data_len)
2144 {
2145         cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid);
2146         drep_msg->local_comm_id = cm_id_priv->id.local_id;
2147         drep_msg->remote_comm_id = cm_id_priv->id.remote_id;
2148
2149         if (private_data && private_data_len)
2150                 memcpy(drep_msg->private_data, private_data, private_data_len);
2151 }
2152
2153 int ib_send_cm_drep(struct ib_cm_id *cm_id,
2154                     const void *private_data,
2155                     u8 private_data_len)
2156 {
2157         struct cm_id_private *cm_id_priv;
2158         struct ib_mad_send_buf *msg;
2159         unsigned long flags;
2160         void *data;
2161         int ret;
2162
2163         if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
2164                 return -EINVAL;
2165
2166         data = cm_copy_private_data(private_data, private_data_len);
2167         if (IS_ERR(data))
2168                 return PTR_ERR(data);
2169
2170         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2171         spin_lock_irqsave(&cm_id_priv->lock, flags);
2172         if (cm_id->state != IB_CM_DREQ_RCVD) {
2173                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2174                 kfree(data);
2175                 return -EINVAL;
2176         }
2177
2178         cm_set_private_data(cm_id_priv, data, private_data_len);
2179         cm_enter_timewait(cm_id_priv);
2180
2181         ret = cm_alloc_msg(cm_id_priv, &msg);
2182         if (ret)
2183                 goto out;
2184
2185         cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2186                        private_data, private_data_len);
2187
2188         ret = ib_post_send_mad(msg, NULL);
2189         if (ret) {
2190                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2191                 cm_free_msg(msg);
2192                 return ret;
2193         }
2194
2195 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2196         return ret;
2197 }
2198 EXPORT_SYMBOL(ib_send_cm_drep);
2199
2200 static int cm_issue_drep(struct cm_port *port,
2201                          struct ib_mad_recv_wc *mad_recv_wc)
2202 {
2203         struct ib_mad_send_buf *msg = NULL;
2204         struct cm_dreq_msg *dreq_msg;
2205         struct cm_drep_msg *drep_msg;
2206         int ret;
2207
2208         ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
2209         if (ret)
2210                 return ret;
2211
2212         dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad;
2213         drep_msg = (struct cm_drep_msg *) msg->mad;
2214
2215         cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid);
2216         drep_msg->remote_comm_id = dreq_msg->local_comm_id;
2217         drep_msg->local_comm_id = dreq_msg->remote_comm_id;
2218
2219         ret = ib_post_send_mad(msg, NULL);
2220         if (ret)
2221                 cm_free_msg(msg);
2222
2223         return ret;
2224 }
2225
2226 static int cm_dreq_handler(struct cm_work *work)
2227 {
2228         struct cm_id_private *cm_id_priv;
2229         struct cm_dreq_msg *dreq_msg;
2230         struct ib_mad_send_buf *msg = NULL;
2231         int ret;
2232
2233         dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
2234         cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id,
2235                                    dreq_msg->local_comm_id);
2236         if (!cm_id_priv) {
2237                 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2238                                 counter[CM_DREQ_COUNTER]);
2239                 cm_issue_drep(work->port, work->mad_recv_wc);
2240                 return -EINVAL;
2241         }
2242
2243         work->cm_event.private_data = &dreq_msg->private_data;
2244
2245         spin_lock_irq(&cm_id_priv->lock);
2246         if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg))
2247                 goto unlock;
2248
2249         switch (cm_id_priv->id.state) {
2250         case IB_CM_REP_SENT:
2251         case IB_CM_DREQ_SENT:
2252                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2253                 break;
2254         case IB_CM_ESTABLISHED:
2255                 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT ||
2256                     cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2257                         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2258                 break;
2259         case IB_CM_MRA_REP_RCVD:
2260                 break;
2261         case IB_CM_TIMEWAIT:
2262                 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2263                                 counter[CM_DREQ_COUNTER]);
2264                 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2265                         goto unlock;
2266
2267                 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2268                                cm_id_priv->private_data,
2269                                cm_id_priv->private_data_len);
2270                 spin_unlock_irq(&cm_id_priv->lock);
2271
2272                 if (ib_post_send_mad(msg, NULL))
2273                         cm_free_msg(msg);
2274                 goto deref;
2275         case IB_CM_DREQ_RCVD:
2276                 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2277                                 counter[CM_DREQ_COUNTER]);
2278                 goto unlock;
2279         default:
2280                 goto unlock;
2281         }
2282         cm_id_priv->id.state = IB_CM_DREQ_RCVD;
2283         cm_id_priv->tid = dreq_msg->hdr.tid;
2284         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2285         if (!ret)
2286                 list_add_tail(&work->list, &cm_id_priv->work_list);
2287         spin_unlock_irq(&cm_id_priv->lock);
2288
2289         if (ret)
2290                 cm_process_work(cm_id_priv, work);
2291         else
2292                 cm_deref_id(cm_id_priv);
2293         return 0;
2294
2295 unlock: spin_unlock_irq(&cm_id_priv->lock);
2296 deref:  cm_deref_id(cm_id_priv);
2297         return -EINVAL;
2298 }
2299
2300 static int cm_drep_handler(struct cm_work *work)
2301 {
2302         struct cm_id_private *cm_id_priv;
2303         struct cm_drep_msg *drep_msg;
2304         int ret;
2305
2306         drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
2307         cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id,
2308                                    drep_msg->local_comm_id);
2309         if (!cm_id_priv)
2310                 return -EINVAL;
2311
2312         work->cm_event.private_data = &drep_msg->private_data;
2313
2314         spin_lock_irq(&cm_id_priv->lock);
2315         if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
2316             cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
2317                 spin_unlock_irq(&cm_id_priv->lock);
2318                 goto out;
2319         }
2320         cm_enter_timewait(cm_id_priv);
2321
2322         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2323         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2324         if (!ret)
2325                 list_add_tail(&work->list, &cm_id_priv->work_list);
2326         spin_unlock_irq(&cm_id_priv->lock);
2327
2328         if (ret)
2329                 cm_process_work(cm_id_priv, work);
2330         else
2331                 cm_deref_id(cm_id_priv);
2332         return 0;
2333 out:
2334         cm_deref_id(cm_id_priv);
2335         return -EINVAL;
2336 }
2337
2338 int ib_send_cm_rej(struct ib_cm_id *cm_id,
2339                    enum ib_cm_rej_reason reason,
2340                    void *ari,
2341                    u8 ari_length,
2342                    const void *private_data,
2343                    u8 private_data_len)
2344 {
2345         struct cm_id_private *cm_id_priv;
2346         struct ib_mad_send_buf *msg;
2347         unsigned long flags;
2348         int ret;
2349
2350         if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
2351             (ari && ari_length > IB_CM_REJ_ARI_LENGTH))
2352                 return -EINVAL;
2353
2354         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2355
2356         spin_lock_irqsave(&cm_id_priv->lock, flags);
2357         switch (cm_id->state) {
2358         case IB_CM_REQ_SENT:
2359         case IB_CM_MRA_REQ_RCVD:
2360         case IB_CM_REQ_RCVD:
2361         case IB_CM_MRA_REQ_SENT:
2362         case IB_CM_REP_RCVD:
2363         case IB_CM_MRA_REP_SENT:
2364                 ret = cm_alloc_msg(cm_id_priv, &msg);
2365                 if (!ret)
2366                         cm_format_rej((struct cm_rej_msg *) msg->mad,
2367                                       cm_id_priv, reason, ari, ari_length,
2368                                       private_data, private_data_len);
2369
2370                 cm_reset_to_idle(cm_id_priv);
2371                 break;
2372         case IB_CM_REP_SENT:
2373         case IB_CM_MRA_REP_RCVD:
2374                 ret = cm_alloc_msg(cm_id_priv, &msg);
2375                 if (!ret)
2376                         cm_format_rej((struct cm_rej_msg *) msg->mad,
2377                                       cm_id_priv, reason, ari, ari_length,
2378                                       private_data, private_data_len);
2379
2380                 cm_enter_timewait(cm_id_priv);
2381                 break;
2382         default:
2383                 ret = -EINVAL;
2384                 goto out;
2385         }
2386
2387         if (ret)
2388                 goto out;
2389
2390         ret = ib_post_send_mad(msg, NULL);
2391         if (ret)
2392                 cm_free_msg(msg);
2393
2394 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2395         return ret;
2396 }
2397 EXPORT_SYMBOL(ib_send_cm_rej);
2398
2399 static void cm_format_rej_event(struct cm_work *work)
2400 {
2401         struct cm_rej_msg *rej_msg;
2402         struct ib_cm_rej_event_param *param;
2403
2404         rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2405         param = &work->cm_event.param.rej_rcvd;
2406         param->ari = rej_msg->ari;
2407         param->ari_length = cm_rej_get_reject_info_len(rej_msg);
2408         param->reason = __be16_to_cpu(rej_msg->reason);
2409         work->cm_event.private_data = &rej_msg->private_data;
2410 }
2411
2412 static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
2413 {
2414         struct cm_timewait_info *timewait_info;
2415         struct cm_id_private *cm_id_priv;
2416         __be32 remote_id;
2417
2418         remote_id = rej_msg->local_comm_id;
2419
2420         if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) {
2421                 spin_lock_irq(&cm.lock);
2422                 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari),
2423                                                   remote_id);
2424                 if (!timewait_info) {
2425                         spin_unlock_irq(&cm.lock);
2426                         return NULL;
2427                 }
2428                 cm_id_priv = idr_find(&cm.local_id_table, (__force int)
2429                                       (timewait_info->work.local_id ^
2430                                        cm.random_id_operand));
2431                 if (cm_id_priv) {
2432                         if (cm_id_priv->id.remote_id == remote_id)
2433                                 atomic_inc(&cm_id_priv->refcount);
2434                         else
2435                                 cm_id_priv = NULL;
2436                 }
2437                 spin_unlock_irq(&cm.lock);
2438         } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ)
2439                 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0);
2440         else
2441                 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id);
2442
2443         return cm_id_priv;
2444 }
2445
2446 static int cm_rej_handler(struct cm_work *work)
2447 {
2448         struct cm_id_private *cm_id_priv;
2449         struct cm_rej_msg *rej_msg;
2450         int ret;
2451
2452         rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2453         cm_id_priv = cm_acquire_rejected_id(rej_msg);
2454         if (!cm_id_priv)
2455                 return -EINVAL;
2456
2457         cm_format_rej_event(work);
2458
2459         spin_lock_irq(&cm_id_priv->lock);
2460         switch (cm_id_priv->id.state) {
2461         case IB_CM_REQ_SENT:
2462         case IB_CM_MRA_REQ_RCVD:
2463         case IB_CM_REP_SENT:
2464         case IB_CM_MRA_REP_RCVD:
2465                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2466                 /* fall through */
2467         case IB_CM_REQ_RCVD:
2468         case IB_CM_MRA_REQ_SENT:
2469                 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN)
2470                         cm_enter_timewait(cm_id_priv);
2471                 else
2472                         cm_reset_to_idle(cm_id_priv);
2473                 break;
2474         case IB_CM_DREQ_SENT:
2475                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2476                 /* fall through */
2477         case IB_CM_REP_RCVD:
2478         case IB_CM_MRA_REP_SENT:
2479                 cm_enter_timewait(cm_id_priv);
2480                 break;
2481         case IB_CM_ESTABLISHED:
2482                 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT ||
2483                     cm_id_priv->id.lap_state == IB_CM_LAP_SENT) {
2484                         if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT)
2485                                 ib_cancel_mad(cm_id_priv->av.port->mad_agent,
2486                                               cm_id_priv->msg);
2487                         cm_enter_timewait(cm_id_priv);
2488                         break;
2489                 }
2490                 /* fall through */
2491         default:
2492                 spin_unlock_irq(&cm_id_priv->lock);
2493                 ret = -EINVAL;
2494                 goto out;
2495         }
2496
2497         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2498         if (!ret)
2499                 list_add_tail(&work->list, &cm_id_priv->work_list);
2500         spin_unlock_irq(&cm_id_priv->lock);
2501
2502         if (ret)
2503                 cm_process_work(cm_id_priv, work);
2504         else
2505                 cm_deref_id(cm_id_priv);
2506         return 0;
2507 out:
2508         cm_deref_id(cm_id_priv);
2509         return -EINVAL;
2510 }
2511
2512 int ib_send_cm_mra(struct ib_cm_id *cm_id,
2513                    u8 service_timeout,
2514                    const void *private_data,
2515                    u8 private_data_len)
2516 {
2517         struct cm_id_private *cm_id_priv;
2518         struct ib_mad_send_buf *msg;
2519         enum ib_cm_state cm_state;
2520         enum ib_cm_lap_state lap_state;
2521         enum cm_msg_response msg_response;
2522         void *data;
2523         unsigned long flags;
2524         int ret;
2525
2526         if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE)
2527                 return -EINVAL;
2528
2529         data = cm_copy_private_data(private_data, private_data_len);
2530         if (IS_ERR(data))
2531                 return PTR_ERR(data);
2532
2533         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2534
2535         spin_lock_irqsave(&cm_id_priv->lock, flags);
2536         switch(cm_id_priv->id.state) {
2537         case IB_CM_REQ_RCVD:
2538                 cm_state = IB_CM_MRA_REQ_SENT;
2539                 lap_state = cm_id->lap_state;
2540                 msg_response = CM_MSG_RESPONSE_REQ;
2541                 break;
2542         case IB_CM_REP_RCVD:
2543                 cm_state = IB_CM_MRA_REP_SENT;
2544                 lap_state = cm_id->lap_state;
2545                 msg_response = CM_MSG_RESPONSE_REP;
2546                 break;
2547         case IB_CM_ESTABLISHED:
2548                 if (cm_id->lap_state == IB_CM_LAP_RCVD) {
2549                         cm_state = cm_id->state;
2550                         lap_state = IB_CM_MRA_LAP_SENT;
2551                         msg_response = CM_MSG_RESPONSE_OTHER;
2552                         break;
2553                 }
2554         default:
2555                 ret = -EINVAL;
2556                 goto error1;
2557         }
2558
2559         if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) {
2560                 ret = cm_alloc_msg(cm_id_priv, &msg);
2561                 if (ret)
2562                         goto error1;
2563
2564                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2565                               msg_response, service_timeout,
2566                               private_data, private_data_len);
2567                 ret = ib_post_send_mad(msg, NULL);
2568                 if (ret)
2569                         goto error2;
2570         }
2571
2572         cm_id->state = cm_state;
2573         cm_id->lap_state = lap_state;
2574         cm_id_priv->service_timeout = service_timeout;
2575         cm_set_private_data(cm_id_priv, data, private_data_len);
2576         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2577         return 0;
2578
2579 error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2580         kfree(data);
2581         return ret;
2582
2583 error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2584         kfree(data);
2585         cm_free_msg(msg);
2586         return ret;
2587 }
2588 EXPORT_SYMBOL(ib_send_cm_mra);
2589
2590 static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
2591 {
2592         switch (cm_mra_get_msg_mraed(mra_msg)) {
2593         case CM_MSG_RESPONSE_REQ:
2594                 return cm_acquire_id(mra_msg->remote_comm_id, 0);
2595         case CM_MSG_RESPONSE_REP:
2596         case CM_MSG_RESPONSE_OTHER:
2597                 return cm_acquire_id(mra_msg->remote_comm_id,
2598                                      mra_msg->local_comm_id);
2599         default:
2600                 return NULL;
2601         }
2602 }
2603
2604 static int cm_mra_handler(struct cm_work *work)
2605 {
2606         struct cm_id_private *cm_id_priv;
2607         struct cm_mra_msg *mra_msg;
2608         int timeout, ret;
2609
2610         mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
2611         cm_id_priv = cm_acquire_mraed_id(mra_msg);
2612         if (!cm_id_priv)
2613                 return -EINVAL;
2614
2615         work->cm_event.private_data = &mra_msg->private_data;
2616         work->cm_event.param.mra_rcvd.service_timeout =
2617                                         cm_mra_get_service_timeout(mra_msg);
2618         timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) +
2619                   cm_convert_to_ms(cm_id_priv->av.timeout);
2620
2621         spin_lock_irq(&cm_id_priv->lock);
2622         switch (cm_id_priv->id.state) {
2623         case IB_CM_REQ_SENT:
2624                 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ ||
2625                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
2626                                   cm_id_priv->msg, timeout))
2627                         goto out;
2628                 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
2629                 break;
2630         case IB_CM_REP_SENT:
2631                 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP ||
2632                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
2633                                   cm_id_priv->msg, timeout))
2634                         goto out;
2635                 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
2636                 break;
2637         case IB_CM_ESTABLISHED:
2638                 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER ||
2639                     cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
2640                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
2641                                   cm_id_priv->msg, timeout)) {
2642                         if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2643                                 atomic_long_inc(&work->port->
2644                                                 counter_group[CM_RECV_DUPLICATES].
2645                                                 counter[CM_MRA_COUNTER]);
2646                         goto out;
2647                 }
2648                 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
2649                 break;
2650         case IB_CM_MRA_REQ_RCVD:
2651         case IB_CM_MRA_REP_RCVD:
2652                 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2653                                 counter[CM_MRA_COUNTER]);
2654                 /* fall through */
2655         default:
2656                 goto out;
2657         }
2658
2659         cm_id_priv->msg->context[1] = (void *) (unsigned long)
2660                                       cm_id_priv->id.state;
2661         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2662         if (!ret)
2663                 list_add_tail(&work->list, &cm_id_priv->work_list);
2664         spin_unlock_irq(&cm_id_priv->lock);
2665
2666         if (ret)
2667                 cm_process_work(cm_id_priv, work);
2668         else
2669                 cm_deref_id(cm_id_priv);
2670         return 0;
2671 out:
2672         spin_unlock_irq(&cm_id_priv->lock);
2673         cm_deref_id(cm_id_priv);
2674         return -EINVAL;
2675 }
2676
2677 static void cm_format_lap(struct cm_lap_msg *lap_msg,
2678                           struct cm_id_private *cm_id_priv,
2679                           struct ib_sa_path_rec *alternate_path,
2680                           const void *private_data,
2681                           u8 private_data_len)
2682 {
2683         cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID,
2684                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP));
2685         lap_msg->local_comm_id = cm_id_priv->id.local_id;
2686         lap_msg->remote_comm_id = cm_id_priv->id.remote_id;
2687         cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn);
2688         /* todo: need remote CM response timeout */
2689         cm_lap_set_remote_resp_timeout(lap_msg, 0x1F);
2690         lap_msg->alt_local_lid = alternate_path->slid;
2691         lap_msg->alt_remote_lid = alternate_path->dlid;
2692         lap_msg->alt_local_gid = alternate_path->sgid;
2693         lap_msg->alt_remote_gid = alternate_path->dgid;
2694         cm_lap_set_flow_label(lap_msg, alternate_path->flow_label);
2695         cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class);
2696         lap_msg->alt_hop_limit = alternate_path->hop_limit;
2697         cm_lap_set_packet_rate(lap_msg, alternate_path->rate);
2698         cm_lap_set_sl(lap_msg, alternate_path->sl);
2699         cm_lap_set_subnet_local(lap_msg, 1); /* local only... */
2700         cm_lap_set_local_ack_timeout(lap_msg,
2701                 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
2702                                alternate_path->packet_life_time));
2703
2704         if (private_data && private_data_len)
2705                 memcpy(lap_msg->private_data, private_data, private_data_len);
2706 }
2707
2708 int ib_send_cm_lap(struct ib_cm_id *cm_id,
2709                    struct ib_sa_path_rec *alternate_path,
2710                    const void *private_data,
2711                    u8 private_data_len)
2712 {
2713         struct cm_id_private *cm_id_priv;
2714         struct ib_mad_send_buf *msg;
2715         unsigned long flags;
2716         int ret;
2717
2718         if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE)
2719                 return -EINVAL;
2720
2721         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2722         spin_lock_irqsave(&cm_id_priv->lock, flags);
2723         if (cm_id->state != IB_CM_ESTABLISHED ||
2724             (cm_id->lap_state != IB_CM_LAP_UNINIT &&
2725              cm_id->lap_state != IB_CM_LAP_IDLE)) {
2726                 ret = -EINVAL;
2727                 goto out;
2728         }
2729
2730         ret = cm_init_av_by_path(alternate_path, &cm_id_priv->alt_av);
2731         if (ret)
2732                 goto out;
2733         cm_id_priv->alt_av.timeout =
2734                         cm_ack_timeout(cm_id_priv->target_ack_delay,
2735                                        cm_id_priv->alt_av.timeout - 1);
2736
2737         ret = cm_alloc_msg(cm_id_priv, &msg);
2738         if (ret)
2739                 goto out;
2740
2741         cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv,
2742                       alternate_path, private_data, private_data_len);
2743         msg->timeout_ms = cm_id_priv->timeout_ms;
2744         msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED;
2745
2746         ret = ib_post_send_mad(msg, NULL);
2747         if (ret) {
2748                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2749                 cm_free_msg(msg);
2750                 return ret;
2751         }
2752
2753         cm_id->lap_state = IB_CM_LAP_SENT;
2754         cm_id_priv->msg = msg;
2755
2756 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2757         return ret;
2758 }
2759 EXPORT_SYMBOL(ib_send_cm_lap);
2760
2761 static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv,
2762                                     struct ib_sa_path_rec *path,
2763                                     struct cm_lap_msg *lap_msg)
2764 {
2765         memset(path, 0, sizeof *path);
2766         path->dgid = lap_msg->alt_local_gid;
2767         path->sgid = lap_msg->alt_remote_gid;
2768         path->dlid = lap_msg->alt_local_lid;
2769         path->slid = lap_msg->alt_remote_lid;
2770         path->flow_label = cm_lap_get_flow_label(lap_msg);
2771         path->hop_limit = lap_msg->alt_hop_limit;
2772         path->traffic_class = cm_lap_get_traffic_class(lap_msg);
2773         path->reversible = 1;
2774         path->pkey = cm_id_priv->pkey;
2775         path->sl = cm_lap_get_sl(lap_msg);
2776         path->mtu_selector = IB_SA_EQ;
2777         path->mtu = cm_id_priv->path_mtu;
2778         path->rate_selector = IB_SA_EQ;
2779         path->rate = cm_lap_get_packet_rate(lap_msg);
2780         path->packet_life_time_selector = IB_SA_EQ;
2781         path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg);
2782         path->packet_life_time -= (path->packet_life_time > 0);
2783 }
2784
2785 static int cm_lap_handler(struct cm_work *work)
2786 {
2787         struct cm_id_private *cm_id_priv;
2788         struct cm_lap_msg *lap_msg;
2789         struct ib_cm_lap_event_param *param;
2790         struct ib_mad_send_buf *msg = NULL;
2791         int ret;
2792
2793         /* todo: verify LAP request and send reject APR if invalid. */
2794         lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
2795         cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id,
2796                                    lap_msg->local_comm_id);
2797         if (!cm_id_priv)
2798                 return -EINVAL;
2799
2800         param = &work->cm_event.param.lap_rcvd;
2801         param->alternate_path = &work->path[0];
2802         cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg);
2803         work->cm_event.private_data = &lap_msg->private_data;
2804
2805         spin_lock_irq(&cm_id_priv->lock);
2806         if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
2807                 goto unlock;
2808
2809         switch (cm_id_priv->id.lap_state) {
2810         case IB_CM_LAP_UNINIT:
2811         case IB_CM_LAP_IDLE:
2812                 break;
2813         case IB_CM_MRA_LAP_SENT:
2814                 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2815                                 counter[CM_LAP_COUNTER]);
2816                 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2817                         goto unlock;
2818
2819                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2820                               CM_MSG_RESPONSE_OTHER,
2821                               cm_id_priv->service_timeout,
2822                               cm_id_priv->private_data,
2823                               cm_id_priv->private_data_len);
2824                 spin_unlock_irq(&cm_id_priv->lock);
2825
2826                 if (ib_post_send_mad(msg, NULL))
2827                         cm_free_msg(msg);
2828                 goto deref;
2829         case IB_CM_LAP_RCVD:
2830                 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2831                                 counter[CM_LAP_COUNTER]);
2832                 goto unlock;
2833         default:
2834                 goto unlock;
2835         }
2836
2837         cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
2838         cm_id_priv->tid = lap_msg->hdr.tid;
2839         cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2840                                 work->mad_recv_wc->recv_buf.grh,
2841                                 &cm_id_priv->av);
2842         cm_init_av_by_path(param->alternate_path, &cm_id_priv->alt_av);
2843         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2844         if (!ret)
2845                 list_add_tail(&work->list, &cm_id_priv->work_list);
2846         spin_unlock_irq(&cm_id_priv->lock);
2847
2848         if (ret)
2849                 cm_process_work(cm_id_priv, work);
2850         else
2851                 cm_deref_id(cm_id_priv);
2852         return 0;
2853
2854 unlock: spin_unlock_irq(&cm_id_priv->lock);
2855 deref:  cm_deref_id(cm_id_priv);
2856         return -EINVAL;
2857 }
2858
2859 static void cm_format_apr(struct cm_apr_msg *apr_msg,
2860                           struct cm_id_private *cm_id_priv,
2861                           enum ib_cm_apr_status status,
2862                           void *info,
2863                           u8 info_length,
2864                           const void *private_data,
2865                           u8 private_data_len)
2866 {
2867         cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid);
2868         apr_msg->local_comm_id = cm_id_priv->id.local_id;
2869         apr_msg->remote_comm_id = cm_id_priv->id.remote_id;
2870         apr_msg->ap_status = (u8) status;
2871
2872         if (info && info_length) {
2873                 apr_msg->info_length = info_length;
2874                 memcpy(apr_msg->info, info, info_length);
2875         }
2876
2877         if (private_data && private_data_len)
2878                 memcpy(apr_msg->private_data, private_data, private_data_len);
2879 }
2880
2881 int ib_send_cm_apr(struct ib_cm_id *cm_id,
2882                    enum ib_cm_apr_status status,
2883                    void *info,
2884                    u8 info_length,
2885                    const void *private_data,
2886                    u8 private_data_len)
2887 {
2888         struct cm_id_private *cm_id_priv;
2889         struct ib_mad_send_buf *msg;
2890         unsigned long flags;
2891         int ret;
2892
2893         if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) ||
2894             (info && info_length > IB_CM_APR_INFO_LENGTH))
2895                 return -EINVAL;
2896
2897         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2898         spin_lock_irqsave(&cm_id_priv->lock, flags);
2899         if (cm_id->state != IB_CM_ESTABLISHED ||
2900             (cm_id->lap_state != IB_CM_LAP_RCVD &&
2901              cm_id->lap_state != IB_CM_MRA_LAP_SENT)) {
2902                 ret = -EINVAL;
2903                 goto out;
2904         }
2905
2906         ret = cm_alloc_msg(cm_id_priv, &msg);
2907         if (ret)
2908                 goto out;
2909
2910         cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status,
2911                       info, info_length, private_data, private_data_len);
2912         ret = ib_post_send_mad(msg, NULL);
2913         if (ret) {
2914                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2915                 cm_free_msg(msg);
2916                 return ret;
2917         }
2918
2919         cm_id->lap_state = IB_CM_LAP_IDLE;
2920 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2921         return ret;
2922 }
2923 EXPORT_SYMBOL(ib_send_cm_apr);
2924
2925 static int cm_apr_handler(struct cm_work *work)
2926 {
2927         struct cm_id_private *cm_id_priv;
2928         struct cm_apr_msg *apr_msg;
2929         int ret;
2930
2931         apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
2932         cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id,
2933                                    apr_msg->local_comm_id);
2934         if (!cm_id_priv)
2935                 return -EINVAL; /* Unmatched reply. */
2936
2937         work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status;
2938         work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info;
2939         work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length;
2940         work->cm_event.private_data = &apr_msg->private_data;
2941
2942         spin_lock_irq(&cm_id_priv->lock);
2943         if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
2944             (cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
2945              cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
2946                 spin_unlock_irq(&cm_id_priv->lock);
2947                 goto out;
2948         }
2949         cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
2950         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2951         cm_id_priv->msg = NULL;
2952
2953         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2954         if (!ret)
2955                 list_add_tail(&work->list, &cm_id_priv->work_list);
2956         spin_unlock_irq(&cm_id_priv->lock);
2957
2958         if (ret)
2959                 cm_process_work(cm_id_priv, work);
2960         else
2961                 cm_deref_id(cm_id_priv);
2962         return 0;
2963 out:
2964         cm_deref_id(cm_id_priv);
2965         return -EINVAL;
2966 }
2967
2968 static int cm_timewait_handler(struct cm_work *work)
2969 {
2970         struct cm_timewait_info *timewait_info;
2971         struct cm_id_private *cm_id_priv;
2972         int ret;
2973
2974         timewait_info = (struct cm_timewait_info *)work;
2975         spin_lock_irq(&cm.lock);
2976         list_del(&timewait_info->list);
2977         spin_unlock_irq(&cm.lock);
2978
2979         cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
2980                                    timewait_info->work.remote_id);
2981         if (!cm_id_priv)
2982                 return -EINVAL;
2983
2984         spin_lock_irq(&cm_id_priv->lock);
2985         if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
2986             cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
2987                 spin_unlock_irq(&cm_id_priv->lock);
2988                 goto out;
2989         }
2990         cm_id_priv->id.state = IB_CM_IDLE;
2991         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2992         if (!ret)
2993                 list_add_tail(&work->list, &cm_id_priv->work_list);
2994         spin_unlock_irq(&cm_id_priv->lock);
2995
2996         if (ret)
2997                 cm_process_work(cm_id_priv, work);
2998         else
2999                 cm_deref_id(cm_id_priv);
3000         return 0;
3001 out:
3002         cm_deref_id(cm_id_priv);
3003         return -EINVAL;
3004 }
3005
3006 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
3007                                struct cm_id_private *cm_id_priv,
3008                                struct ib_cm_sidr_req_param *param)
3009 {
3010         cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
3011                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR));
3012         sidr_req_msg->request_id = cm_id_priv->id.local_id;
3013         sidr_req_msg->pkey = param->path->pkey;
3014         sidr_req_msg->service_id = param->service_id;
3015
3016         if (param->private_data && param->private_data_len)
3017                 memcpy(sidr_req_msg->private_data, param->private_data,
3018                        param->private_data_len);
3019 }
3020
3021 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
3022                         struct ib_cm_sidr_req_param *param)
3023 {
3024         struct cm_id_private *cm_id_priv;
3025         struct ib_mad_send_buf *msg;
3026         unsigned long flags;
3027         int ret;
3028
3029         if (!param->path || (param->private_data &&
3030              param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
3031                 return -EINVAL;
3032
3033         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3034         ret = cm_init_av_by_path(param->path, &cm_id_priv->av);
3035         if (ret)
3036                 goto out;
3037
3038         cm_id->service_id = param->service_id;
3039         cm_id->service_mask = ~cpu_to_be64(0);
3040         cm_id_priv->timeout_ms = param->timeout_ms;
3041         cm_id_priv->max_cm_retries = param->max_cm_retries;
3042         ret = cm_alloc_msg(cm_id_priv, &msg);
3043         if (ret)
3044                 goto out;
3045
3046         cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv,
3047                            param);
3048         msg->timeout_ms = cm_id_priv->timeout_ms;
3049         msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT;
3050
3051         spin_lock_irqsave(&cm_id_priv->lock, flags);
3052         if (cm_id->state == IB_CM_IDLE)
3053                 ret = ib_post_send_mad(msg, NULL);
3054         else
3055                 ret = -EINVAL;
3056
3057         if (ret) {
3058                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3059                 cm_free_msg(msg);
3060                 goto out;
3061         }
3062         cm_id->state = IB_CM_SIDR_REQ_SENT;
3063         cm_id_priv->msg = msg;
3064         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3065 out:
3066         return ret;
3067 }
3068 EXPORT_SYMBOL(ib_send_cm_sidr_req);
3069
3070 static void cm_format_sidr_req_event(struct cm_work *work,
3071                                      struct ib_cm_id *listen_id)
3072 {
3073         struct cm_sidr_req_msg *sidr_req_msg;
3074         struct ib_cm_sidr_req_event_param *param;
3075
3076         sidr_req_msg = (struct cm_sidr_req_msg *)
3077                                 work->mad_recv_wc->recv_buf.mad;
3078         param = &work->cm_event.param.sidr_req_rcvd;
3079         param->pkey = __be16_to_cpu(sidr_req_msg->pkey);
3080         param->listen_id = listen_id;
3081         param->service_id = sidr_req_msg->service_id;
3082         param->bth_pkey = cm_get_bth_pkey(work);
3083         param->port = work->port->port_num;
3084         work->cm_event.private_data = &sidr_req_msg->private_data;
3085 }
3086
3087 static int cm_sidr_req_handler(struct cm_work *work)
3088 {
3089         struct ib_cm_id *cm_id;
3090         struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
3091         struct cm_sidr_req_msg *sidr_req_msg;
3092         struct ib_wc *wc;
3093
3094         cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL);
3095         if (IS_ERR(cm_id))
3096                 return PTR_ERR(cm_id);
3097         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3098
3099         /* Record SGID/SLID and request ID for lookup. */
3100         sidr_req_msg = (struct cm_sidr_req_msg *)
3101                                 work->mad_recv_wc->recv_buf.mad;
3102         wc = work->mad_recv_wc->wc;
3103         cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid);
3104         cm_id_priv->av.dgid.global.interface_id = 0;
3105         cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
3106                                 work->mad_recv_wc->recv_buf.grh,
3107                                 &cm_id_priv->av);
3108         cm_id_priv->id.remote_id = sidr_req_msg->request_id;
3109         cm_id_priv->tid = sidr_req_msg->hdr.tid;
3110         atomic_inc(&cm_id_priv->work_count);
3111
3112         spin_lock_irq(&cm.lock);
3113         cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
3114         if (cur_cm_id_priv) {
3115                 spin_unlock_irq(&cm.lock);
3116                 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
3117                                 counter[CM_SIDR_REQ_COUNTER]);
3118                 goto out; /* Duplicate message. */
3119         }
3120         cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
3121         cur_cm_id_priv = cm_find_listen(cm_id->device,
3122                                         sidr_req_msg->service_id);
3123         if (!cur_cm_id_priv) {
3124                 spin_unlock_irq(&cm.lock);
3125                 cm_reject_sidr_req(cm_id_priv, IB_SIDR_UNSUPPORTED);
3126                 goto out; /* No match. */
3127         }
3128         atomic_inc(&cur_cm_id_priv->refcount);
3129         atomic_inc(&cm_id_priv->refcount);
3130         spin_unlock_irq(&cm.lock);
3131
3132         cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler;
3133         cm_id_priv->id.context = cur_cm_id_priv->id.context;
3134         cm_id_priv->id.service_id = sidr_req_msg->service_id;
3135         cm_id_priv->id.service_mask = ~cpu_to_be64(0);
3136
3137         cm_format_sidr_req_event(work, &cur_cm_id_priv->id);
3138         cm_process_work(cm_id_priv, work);
3139         cm_deref_id(cur_cm_id_priv);
3140         return 0;
3141 out:
3142         ib_destroy_cm_id(&cm_id_priv->id);
3143         return -EINVAL;
3144 }
3145
3146 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
3147                                struct cm_id_private *cm_id_priv,
3148                                struct ib_cm_sidr_rep_param *param)
3149 {
3150         cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
3151                           cm_id_priv->tid);
3152         sidr_rep_msg->request_id = cm_id_priv->id.remote_id;
3153         sidr_rep_msg->status = param->status;
3154         cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num));
3155         sidr_rep_msg->service_id = cm_id_priv->id.service_id;
3156         sidr_rep_msg->qkey = cpu_to_be32(param->qkey);
3157
3158         if (param->info && param->info_length)
3159                 memcpy(sidr_rep_msg->info, param->info, param->info_length);
3160
3161         if (param->private_data && param->private_data_len)
3162                 memcpy(sidr_rep_msg->private_data, param->private_data,
3163                        param->private_data_len);
3164 }
3165
3166 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
3167                         struct ib_cm_sidr_rep_param *param)
3168 {
3169         struct cm_id_private *cm_id_priv;
3170         struct ib_mad_send_buf *msg;
3171         unsigned long flags;
3172         int ret;
3173
3174         if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
3175             (param->private_data &&
3176              param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE))
3177                 return -EINVAL;
3178
3179         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3180         spin_lock_irqsave(&cm_id_priv->lock, flags);
3181         if (cm_id->state != IB_CM_SIDR_REQ_RCVD) {
3182                 ret = -EINVAL;
3183                 goto error;
3184         }
3185
3186         ret = cm_alloc_msg(cm_id_priv, &msg);
3187         if (ret)
3188                 goto error;
3189
3190         cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
3191                            param);
3192         ret = ib_post_send_mad(msg, NULL);
3193         if (ret) {
3194                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3195                 cm_free_msg(msg);
3196                 return ret;
3197         }
3198         cm_id->state = IB_CM_IDLE;
3199         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3200
3201         spin_lock_irqsave(&cm.lock, flags);
3202         if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) {
3203                 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
3204                 RB_CLEAR_NODE(&cm_id_priv->sidr_id_node);
3205         }
3206         spin_unlock_irqrestore(&cm.lock, flags);
3207         return 0;
3208
3209 error:  spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3210         return ret;
3211 }
3212 EXPORT_SYMBOL(ib_send_cm_sidr_rep);
3213
3214 static void cm_format_sidr_rep_event(struct cm_work *work)
3215 {
3216         struct cm_sidr_rep_msg *sidr_rep_msg;
3217         struct ib_cm_sidr_rep_event_param *param;
3218
3219         sidr_rep_msg = (struct cm_sidr_rep_msg *)
3220                                 work->mad_recv_wc->recv_buf.mad;
3221         param = &work->cm_event.param.sidr_rep_rcvd;
3222         param->status = sidr_rep_msg->status;
3223         param->qkey = be32_to_cpu(sidr_rep_msg->qkey);
3224         param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg));
3225         param->info = &sidr_rep_msg->info;
3226         param->info_len = sidr_rep_msg->info_length;
3227         work->cm_event.private_data = &sidr_rep_msg->private_data;
3228 }
3229
3230 static int cm_sidr_rep_handler(struct cm_work *work)
3231 {
3232         struct cm_sidr_rep_msg *sidr_rep_msg;
3233         struct cm_id_private *cm_id_priv;
3234
3235         sidr_rep_msg = (struct cm_sidr_rep_msg *)
3236                                 work->mad_recv_wc->recv_buf.mad;
3237         cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0);
3238         if (!cm_id_priv)
3239                 return -EINVAL; /* Unmatched reply. */
3240
3241         spin_lock_irq(&cm_id_priv->lock);
3242         if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
3243                 spin_unlock_irq(&cm_id_priv->lock);
3244                 goto out;
3245         }
3246         cm_id_priv->id.state = IB_CM_IDLE;
3247         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
3248         spin_unlock_irq(&cm_id_priv->lock);
3249
3250         cm_format_sidr_rep_event(work);
3251         cm_process_work(cm_id_priv, work);
3252         return 0;
3253 out:
3254         cm_deref_id(cm_id_priv);
3255         return -EINVAL;
3256 }
3257
3258 static void cm_process_send_error(struct ib_mad_send_buf *msg,
3259                                   enum ib_wc_status wc_status)
3260 {
3261         struct cm_id_private *cm_id_priv;
3262         struct ib_cm_event cm_event;
3263         enum ib_cm_state state;
3264         int ret;
3265
3266         memset(&cm_event, 0, sizeof cm_event);
3267         cm_id_priv = msg->context[0];
3268
3269         /* Discard old sends or ones without a response. */
3270         spin_lock_irq(&cm_id_priv->lock);
3271         state = (enum ib_cm_state) (unsigned long) msg->context[1];
3272         if (msg != cm_id_priv->msg || state != cm_id_priv->id.state)
3273                 goto discard;
3274
3275         switch (state) {
3276         case IB_CM_REQ_SENT:
3277         case IB_CM_MRA_REQ_RCVD:
3278                 cm_reset_to_idle(cm_id_priv);
3279                 cm_event.event = IB_CM_REQ_ERROR;
3280                 break;
3281         case IB_CM_REP_SENT:
3282         case IB_CM_MRA_REP_RCVD:
3283                 cm_reset_to_idle(cm_id_priv);
3284                 cm_event.event = IB_CM_REP_ERROR;
3285                 break;
3286         case IB_CM_DREQ_SENT:
3287                 cm_enter_timewait(cm_id_priv);
3288                 cm_event.event = IB_CM_DREQ_ERROR;
3289                 break;
3290         case IB_CM_SIDR_REQ_SENT:
3291                 cm_id_priv->id.state = IB_CM_IDLE;
3292                 cm_event.event = IB_CM_SIDR_REQ_ERROR;
3293                 break;
3294         default:
3295                 goto discard;
3296         }
3297         spin_unlock_irq(&cm_id_priv->lock);
3298         cm_event.param.send_status = wc_status;
3299
3300         /* No other events can occur on the cm_id at this point. */
3301         ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
3302         cm_free_msg(msg);
3303         if (ret)
3304                 ib_destroy_cm_id(&cm_id_priv->id);
3305         return;
3306 discard:
3307         spin_unlock_irq(&cm_id_priv->lock);
3308         cm_free_msg(msg);
3309 }
3310
3311 static void cm_send_handler(struct ib_mad_agent *mad_agent,
3312                             struct ib_mad_send_wc *mad_send_wc)
3313 {
3314         struct ib_mad_send_buf *msg = mad_send_wc->send_buf;
3315         struct cm_port *port;
3316         u16 attr_index;
3317
3318         port = mad_agent->context;
3319         attr_index = be16_to_cpu(((struct ib_mad_hdr *)
3320                                   msg->mad)->attr_id) - CM_ATTR_ID_OFFSET;
3321
3322         /*
3323          * If the send was in response to a received message (context[0] is not
3324          * set to a cm_id), and is not a REJ, then it is a send that was
3325          * manually retried.
3326          */
3327         if (!msg->context[0] && (attr_index != CM_REJ_COUNTER))
3328                 msg->retries = 1;
3329
3330         atomic_long_add(1 + msg->retries,
3331                         &port->counter_group[CM_XMIT].counter[attr_index]);
3332         if (msg->retries)
3333                 atomic_long_add(msg->retries,
3334                                 &port->counter_group[CM_XMIT_RETRIES].
3335                                 counter[attr_index]);
3336
3337         switch (mad_send_wc->status) {
3338         case IB_WC_SUCCESS:
3339         case IB_WC_WR_FLUSH_ERR:
3340                 cm_free_msg(msg);
3341                 break;
3342         default:
3343                 if (msg->context[0] && msg->context[1])
3344                         cm_process_send_error(msg, mad_send_wc->status);
3345                 else
3346                         cm_free_msg(msg);
3347                 break;
3348         }
3349 }
3350
3351 static void cm_work_handler(struct work_struct *_work)
3352 {
3353         struct cm_work *work = container_of(_work, struct cm_work, work.work);
3354         int ret;
3355
3356         switch (work->cm_event.event) {
3357         case IB_CM_REQ_RECEIVED:
3358                 ret = cm_req_handler(work);
3359                 break;
3360         case IB_CM_MRA_RECEIVED:
3361                 ret = cm_mra_handler(work);
3362                 break;
3363         case IB_CM_REJ_RECEIVED:
3364                 ret = cm_rej_handler(work);
3365                 break;
3366         case IB_CM_REP_RECEIVED:
3367                 ret = cm_rep_handler(work);
3368                 break;
3369         case IB_CM_RTU_RECEIVED:
3370                 ret = cm_rtu_handler(work);
3371                 break;
3372         case IB_CM_USER_ESTABLISHED:
3373                 ret = cm_establish_handler(work);
3374                 break;
3375         case IB_CM_DREQ_RECEIVED:
3376                 ret = cm_dreq_handler(work);
3377                 break;
3378         case IB_CM_DREP_RECEIVED:
3379                 ret = cm_drep_handler(work);
3380                 break;
3381         case IB_CM_SIDR_REQ_RECEIVED:
3382                 ret = cm_sidr_req_handler(work);
3383                 break;
3384         case IB_CM_SIDR_REP_RECEIVED:
3385                 ret = cm_sidr_rep_handler(work);
3386                 break;
3387         case IB_CM_LAP_RECEIVED:
3388                 ret = cm_lap_handler(work);
3389                 break;
3390         case IB_CM_APR_RECEIVED:
3391                 ret = cm_apr_handler(work);
3392                 break;
3393         case IB_CM_TIMEWAIT_EXIT:
3394                 ret = cm_timewait_handler(work);
3395                 break;
3396         default:
3397                 ret = -EINVAL;
3398                 break;
3399         }
3400         if (ret)
3401                 cm_free_work(work);
3402 }
3403
3404 static int cm_establish(struct ib_cm_id *cm_id)
3405 {
3406         struct cm_id_private *cm_id_priv;
3407         struct cm_work *work;
3408         unsigned long flags;
3409         int ret = 0;
3410         struct cm_device *cm_dev;
3411
3412         cm_dev = ib_get_client_data(cm_id->device, &cm_client);
3413         if (!cm_dev)
3414                 return -ENODEV;
3415
3416         work = kmalloc(sizeof *work, GFP_ATOMIC);
3417         if (!work)
3418                 return -ENOMEM;
3419
3420         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3421         spin_lock_irqsave(&cm_id_priv->lock, flags);
3422         switch (cm_id->state)
3423         {
3424         case IB_CM_REP_SENT:
3425         case IB_CM_MRA_REP_RCVD:
3426                 cm_id->state = IB_CM_ESTABLISHED;
3427                 break;
3428         case IB_CM_ESTABLISHED:
3429                 ret = -EISCONN;
3430                 break;
3431         default:
3432                 ret = -EINVAL;
3433                 break;
3434         }
3435         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3436
3437         if (ret) {
3438                 kfree(work);
3439                 goto out;
3440         }
3441
3442         /*
3443          * The CM worker thread may try to destroy the cm_id before it
3444          * can execute this work item.  To prevent potential deadlock,
3445          * we need to find the cm_id once we're in the context of the
3446          * worker thread, rather than holding a reference on it.
3447          */
3448         INIT_DELAYED_WORK(&work->work, cm_work_handler);
3449         work->local_id = cm_id->local_id;
3450         work->remote_id = cm_id->remote_id;
3451         work->mad_recv_wc = NULL;
3452         work->cm_event.event = IB_CM_USER_ESTABLISHED;
3453
3454         /* Check if the device started its remove_one */
3455         spin_lock_irqsave(&cm.lock, flags);
3456         if (!cm_dev->going_down) {
3457                 queue_delayed_work(cm.wq, &work->work, 0);
3458         } else {
3459                 kfree(work);
3460                 ret = -ENODEV;
3461         }
3462         spin_unlock_irqrestore(&cm.lock, flags);
3463
3464 out:
3465         return ret;
3466 }
3467
3468 static int cm_migrate(struct ib_cm_id *cm_id)
3469 {
3470         struct cm_id_private *cm_id_priv;
3471         unsigned long flags;
3472         int ret = 0;
3473
3474         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3475         spin_lock_irqsave(&cm_id_priv->lock, flags);
3476         if (cm_id->state == IB_CM_ESTABLISHED &&
3477             (cm_id->lap_state == IB_CM_LAP_UNINIT ||
3478              cm_id->lap_state == IB_CM_LAP_IDLE)) {
3479                 cm_id->lap_state = IB_CM_LAP_IDLE;
3480                 cm_id_priv->av = cm_id_priv->alt_av;
3481         } else
3482                 ret = -EINVAL;
3483         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3484
3485         return ret;
3486 }
3487
3488 int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event)
3489 {
3490         int ret;
3491
3492         switch (event) {
3493         case IB_EVENT_COMM_EST:
3494                 ret = cm_establish(cm_id);
3495                 break;
3496         case IB_EVENT_PATH_MIG:
3497                 ret = cm_migrate(cm_id);
3498                 break;
3499         default:
3500                 ret = -EINVAL;
3501         }
3502         return ret;
3503 }
3504 EXPORT_SYMBOL(ib_cm_notify);
3505
3506 static void cm_recv_handler(struct ib_mad_agent *mad_agent,
3507                             struct ib_mad_send_buf *send_buf,
3508                             struct ib_mad_recv_wc *mad_recv_wc)
3509 {
3510         struct cm_port *port = mad_agent->context;
3511         struct cm_work *work;
3512         enum ib_cm_event_type event;
3513         u16 attr_id;
3514         int paths = 0;
3515         int going_down = 0;
3516
3517         switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
3518         case CM_REQ_ATTR_ID:
3519                 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)->
3520                                                     alt_local_lid != 0);
3521                 event = IB_CM_REQ_RECEIVED;
3522                 break;
3523         case CM_MRA_ATTR_ID:
3524                 event = IB_CM_MRA_RECEIVED;
3525                 break;
3526         case CM_REJ_ATTR_ID:
3527                 event = IB_CM_REJ_RECEIVED;
3528                 break;
3529         case CM_REP_ATTR_ID:
3530                 event = IB_CM_REP_RECEIVED;
3531                 break;
3532         case CM_RTU_ATTR_ID:
3533                 event = IB_CM_RTU_RECEIVED;
3534                 break;
3535         case CM_DREQ_ATTR_ID:
3536                 event = IB_CM_DREQ_RECEIVED;
3537                 break;
3538         case CM_DREP_ATTR_ID:
3539                 event = IB_CM_DREP_RECEIVED;
3540                 break;
3541         case CM_SIDR_REQ_ATTR_ID:
3542                 event = IB_CM_SIDR_REQ_RECEIVED;
3543                 break;
3544         case CM_SIDR_REP_ATTR_ID:
3545                 event = IB_CM_SIDR_REP_RECEIVED;
3546                 break;
3547         case CM_LAP_ATTR_ID:
3548                 paths = 1;
3549                 event = IB_CM_LAP_RECEIVED;
3550                 break;
3551         case CM_APR_ATTR_ID:
3552                 event = IB_CM_APR_RECEIVED;
3553                 break;
3554         default:
3555                 ib_free_recv_mad(mad_recv_wc);
3556                 return;
3557         }
3558
3559         attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id);
3560         atomic_long_inc(&port->counter_group[CM_RECV].
3561                         counter[attr_id - CM_ATTR_ID_OFFSET]);
3562
3563         work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths,
3564                        GFP_KERNEL);
3565         if (!work) {
3566                 ib_free_recv_mad(mad_recv_wc);
3567                 return;
3568         }
3569
3570         INIT_DELAYED_WORK(&work->work, cm_work_handler);
3571         work->cm_event.event = event;
3572         work->mad_recv_wc = mad_recv_wc;
3573         work->port = port;
3574
3575         /* Check if the device started its remove_one */
3576         spin_lock_irq(&cm.lock);
3577         if (!port->cm_dev->going_down)
3578                 queue_delayed_work(cm.wq, &work->work, 0);
3579         else
3580                 going_down = 1;
3581         spin_unlock_irq(&cm.lock);
3582
3583         if (going_down) {
3584                 kfree(work);
3585                 ib_free_recv_mad(mad_recv_wc);
3586         }
3587 }
3588
3589 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
3590                                 struct ib_qp_attr *qp_attr,
3591                                 int *qp_attr_mask)
3592 {
3593         unsigned long flags;
3594         int ret;
3595
3596         spin_lock_irqsave(&cm_id_priv->lock, flags);
3597         switch (cm_id_priv->id.state) {
3598         case IB_CM_REQ_SENT:
3599         case IB_CM_MRA_REQ_RCVD:
3600         case IB_CM_REQ_RCVD:
3601         case IB_CM_MRA_REQ_SENT:
3602         case IB_CM_REP_RCVD:
3603         case IB_CM_MRA_REP_SENT:
3604         case IB_CM_REP_SENT:
3605         case IB_CM_MRA_REP_RCVD:
3606         case IB_CM_ESTABLISHED:
3607                 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
3608                                 IB_QP_PKEY_INDEX | IB_QP_PORT;
3609                 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE;
3610                 if (cm_id_priv->responder_resources)
3611                         qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ |
3612                                                     IB_ACCESS_REMOTE_ATOMIC;
3613                 qp_attr->pkey_index = cm_id_priv->av.pkey_index;
3614                 qp_attr->port_num = cm_id_priv->av.port->port_num;
3615                 ret = 0;
3616                 break;
3617         default:
3618                 ret = -EINVAL;
3619                 break;
3620         }
3621         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3622         return ret;
3623 }
3624
3625 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
3626                                struct ib_qp_attr *qp_attr,
3627                                int *qp_attr_mask)
3628 {
3629         unsigned long flags;
3630         int ret;
3631
3632         spin_lock_irqsave(&cm_id_priv->lock, flags);
3633         switch (cm_id_priv->id.state) {
3634         case IB_CM_REQ_RCVD:
3635         case IB_CM_MRA_REQ_SENT:
3636         case IB_CM_REP_RCVD:
3637         case IB_CM_MRA_REP_SENT:
3638         case IB_CM_REP_SENT:
3639         case IB_CM_MRA_REP_RCVD:
3640         case IB_CM_ESTABLISHED:
3641                 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
3642                                 IB_QP_DEST_QPN | IB_QP_RQ_PSN;
3643                 qp_attr->ah_attr = cm_id_priv->av.ah_attr;
3644                 qp_attr->path_mtu = cm_id_priv->path_mtu;
3645                 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
3646                 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
3647                 if (cm_id_priv->qp_type == IB_QPT_RC ||
3648                     cm_id_priv->qp_type == IB_QPT_XRC_TGT) {
3649                         *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC |
3650                                          IB_QP_MIN_RNR_TIMER;
3651                         qp_attr->max_dest_rd_atomic =
3652                                         cm_id_priv->responder_resources;
3653                         qp_attr->min_rnr_timer = 0;
3654                 }
3655                 if (cm_id_priv->alt_av.ah_attr.dlid) {
3656                         *qp_attr_mask |= IB_QP_ALT_PATH;
3657                         qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
3658                         qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
3659                         qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
3660                         qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3661                 }
3662                 ret = 0;
3663                 break;
3664         default:
3665                 ret = -EINVAL;
3666                 break;
3667         }
3668         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3669         return ret;
3670 }
3671
3672 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv,
3673                                struct ib_qp_attr *qp_attr,
3674                                int *qp_attr_mask)
3675 {
3676         unsigned long flags;
3677         int ret;
3678
3679         spin_lock_irqsave(&cm_id_priv->lock, flags);
3680         switch (cm_id_priv->id.state) {
3681         /* Allow transition to RTS before sending REP */
3682         case IB_CM_REQ_RCVD:
3683         case IB_CM_MRA_REQ_SENT:
3684
3685         case IB_CM_REP_RCVD:
3686         case IB_CM_MRA_REP_SENT:
3687         case IB_CM_REP_SENT:
3688         case IB_CM_MRA_REP_RCVD:
3689         case IB_CM_ESTABLISHED:
3690                 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) {
3691                         *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN;
3692                         qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn);
3693                         switch (cm_id_priv->qp_type) {
3694                         case IB_QPT_RC:
3695                         case IB_QPT_XRC_INI:
3696                                 *qp_attr_mask |= IB_QP_RETRY_CNT | IB_QP_RNR_RETRY |
3697                                                  IB_QP_MAX_QP_RD_ATOMIC;
3698                                 qp_attr->retry_cnt = cm_id_priv->retry_count;
3699                                 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count;
3700                                 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth;
3701                                 /* fall through */
3702                         case IB_QPT_XRC_TGT:
3703                                 *qp_attr_mask |= IB_QP_TIMEOUT;
3704                                 qp_attr->timeout = cm_id_priv->av.timeout;
3705                                 break;
3706                         default:
3707                                 break;
3708                         }
3709                         if (cm_id_priv->alt_av.ah_attr.dlid) {
3710                                 *qp_attr_mask |= IB_QP_PATH_MIG_STATE;
3711                                 qp_attr->path_mig_state = IB_MIG_REARM;
3712                         }
3713                 } else {
3714                         *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE;
3715                         qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
3716                         qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
3717                         qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
3718                         qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3719                         qp_attr->path_mig_state = IB_MIG_REARM;
3720                 }
3721                 ret = 0;
3722                 break;
3723         default:
3724                 ret = -EINVAL;
3725                 break;
3726         }
3727         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3728         return ret;
3729 }
3730
3731 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
3732                        struct ib_qp_attr *qp_attr,
3733                        int *qp_attr_mask)
3734 {
3735         struct cm_id_private *cm_id_priv;
3736         int ret;
3737
3738         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3739         switch (qp_attr->qp_state) {
3740         case IB_QPS_INIT:
3741                 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask);
3742                 break;
3743         case IB_QPS_RTR:
3744                 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask);
3745                 break;
3746         case IB_QPS_RTS:
3747                 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask);
3748                 break;
3749         default:
3750                 ret = -EINVAL;
3751                 break;
3752         }
3753         return ret;
3754 }
3755 EXPORT_SYMBOL(ib_cm_init_qp_attr);
3756
3757 static ssize_t cm_show_counter(struct kobject *obj, struct attribute *attr,
3758                                char *buf)
3759 {
3760         struct cm_counter_group *group;
3761         struct cm_counter_attribute *cm_attr;
3762
3763         group = container_of(obj, struct cm_counter_group, obj);
3764         cm_attr = container_of(attr, struct cm_counter_attribute, attr);
3765
3766         return sprintf(buf, "%ld\n",
3767                        atomic_long_read(&group->counter[cm_attr->index]));
3768 }
3769
3770 static const struct sysfs_ops cm_counter_ops = {
3771         .show = cm_show_counter
3772 };
3773
3774 static struct kobj_type cm_counter_obj_type = {
3775         .sysfs_ops = &cm_counter_ops,
3776         .default_attrs = cm_counter_default_attrs
3777 };
3778
3779 static void cm_release_port_obj(struct kobject *obj)
3780 {
3781         struct cm_port *cm_port;
3782
3783         cm_port = container_of(obj, struct cm_port, port_obj);
3784         kfree(cm_port);
3785 }
3786
3787 static struct kobj_type cm_port_obj_type = {
3788         .release = cm_release_port_obj
3789 };
3790
3791 static char *cm_devnode(struct device *dev, umode_t *mode)
3792 {
3793         if (mode)
3794                 *mode = 0666;
3795         return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
3796 }
3797
3798 struct class cm_class = {
3799         .owner   = THIS_MODULE,
3800         .name    = "infiniband_cm",
3801         .devnode = cm_devnode,
3802 };
3803 EXPORT_SYMBOL(cm_class);
3804
3805 static int cm_create_port_fs(struct cm_port *port)
3806 {
3807         int i, ret;
3808
3809         ret = kobject_init_and_add(&port->port_obj, &cm_port_obj_type,
3810                                    &port->cm_dev->device->kobj,
3811                                    "%d", port->port_num);
3812         if (ret) {
3813                 kfree(port);
3814                 return ret;
3815         }
3816
3817         for (i = 0; i < CM_COUNTER_GROUPS; i++) {
3818                 ret = kobject_init_and_add(&port->counter_group[i].obj,
3819                                            &cm_counter_obj_type,
3820                                            &port->port_obj,
3821                                            "%s", counter_group_names[i]);
3822                 if (ret)
3823                         goto error;
3824         }
3825
3826         return 0;
3827
3828 error:
3829         while (i--)
3830                 kobject_put(&port->counter_group[i].obj);
3831         kobject_put(&port->port_obj);
3832         return ret;
3833
3834 }
3835
3836 static void cm_remove_port_fs(struct cm_port *port)
3837 {
3838         int i;
3839
3840         for (i = 0; i < CM_COUNTER_GROUPS; i++)
3841                 kobject_put(&port->counter_group[i].obj);
3842
3843         kobject_put(&port->port_obj);
3844 }
3845
3846 static void cm_add_one(struct ib_device *ib_device)
3847 {
3848         struct cm_device *cm_dev;
3849         struct cm_port *port;
3850         struct ib_mad_reg_req reg_req = {
3851                 .mgmt_class = IB_MGMT_CLASS_CM,
3852                 .mgmt_class_version = IB_CM_CLASS_VERSION,
3853         };
3854         struct ib_port_modify port_modify = {
3855                 .set_port_cap_mask = IB_PORT_CM_SUP
3856         };
3857         unsigned long flags;
3858         int ret;
3859         int count = 0;
3860         u8 i;
3861
3862         cm_dev = kzalloc(sizeof(*cm_dev) + sizeof(*port) *
3863                          ib_device->phys_port_cnt, GFP_KERNEL);
3864         if (!cm_dev)
3865                 return;
3866
3867         cm_dev->ib_device = ib_device;
3868         cm_dev->ack_delay = ib_device->attrs.local_ca_ack_delay;
3869         cm_dev->going_down = 0;
3870         cm_dev->device = device_create(&cm_class, &ib_device->dev,
3871                                        MKDEV(0, 0), NULL,
3872                                        "%s", ib_device->name);
3873         if (IS_ERR(cm_dev->device)) {
3874                 kfree(cm_dev);
3875                 return;
3876         }
3877
3878         set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
3879         for (i = 1; i <= ib_device->phys_port_cnt; i++) {
3880                 if (!rdma_cap_ib_cm(ib_device, i))
3881                         continue;
3882
3883                 port = kzalloc(sizeof *port, GFP_KERNEL);
3884                 if (!port)
3885                         goto error1;
3886
3887                 cm_dev->port[i-1] = port;
3888                 port->cm_dev = cm_dev;
3889                 port->port_num = i;
3890
3891                 ret = cm_create_port_fs(port);
3892                 if (ret)
3893                         goto error1;
3894
3895                 port->mad_agent = ib_register_mad_agent(ib_device, i,
3896                                                         IB_QPT_GSI,
3897                                                         &reg_req,
3898                                                         0,
3899                                                         cm_send_handler,
3900                                                         cm_recv_handler,
3901                                                         port,
3902                                                         0);
3903                 if (IS_ERR(port->mad_agent))
3904                         goto error2;
3905
3906                 ret = ib_modify_port(ib_device, i, 0, &port_modify);
3907                 if (ret)
3908                         goto error3;
3909
3910                 count++;
3911         }
3912
3913         if (!count)
3914                 goto free;
3915
3916         ib_set_client_data(ib_device, &cm_client, cm_dev);
3917
3918         write_lock_irqsave(&cm.device_lock, flags);
3919         list_add_tail(&cm_dev->list, &cm.device_list);
3920         write_unlock_irqrestore(&cm.device_lock, flags);
3921         return;
3922
3923 error3:
3924         ib_unregister_mad_agent(port->mad_agent);
3925 error2:
3926         cm_remove_port_fs(port);
3927 error1:
3928         port_modify.set_port_cap_mask = 0;
3929         port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
3930         while (--i) {
3931                 if (!rdma_cap_ib_cm(ib_device, i))
3932                         continue;
3933
3934                 port = cm_dev->port[i-1];
3935                 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
3936                 ib_unregister_mad_agent(port->mad_agent);
3937                 cm_remove_port_fs(port);
3938         }
3939 free:
3940         device_unregister(cm_dev->device);
3941         kfree(cm_dev);
3942 }
3943
3944 static void cm_remove_one(struct ib_device *ib_device, void *client_data)
3945 {
3946         struct cm_device *cm_dev = client_data;
3947         struct cm_port *port;
3948         struct ib_port_modify port_modify = {
3949                 .clr_port_cap_mask = IB_PORT_CM_SUP
3950         };
3951         unsigned long flags;
3952         int i;
3953
3954         if (!cm_dev)
3955                 return;
3956
3957         write_lock_irqsave(&cm.device_lock, flags);
3958         list_del(&cm_dev->list);
3959         write_unlock_irqrestore(&cm.device_lock, flags);
3960
3961         spin_lock_irq(&cm.lock);
3962         cm_dev->going_down = 1;
3963         spin_unlock_irq(&cm.lock);
3964
3965         for (i = 1; i <= ib_device->phys_port_cnt; i++) {
3966                 if (!rdma_cap_ib_cm(ib_device, i))
3967                         continue;
3968
3969                 port = cm_dev->port[i-1];
3970                 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
3971                 /*
3972                  * We flush the queue here after the going_down set, this
3973                  * verify that no new works will be queued in the recv handler,
3974                  * after that we can call the unregister_mad_agent
3975                  */
3976                 flush_workqueue(cm.wq);
3977                 ib_unregister_mad_agent(port->mad_agent);
3978                 cm_remove_port_fs(port);
3979         }
3980         device_unregister(cm_dev->device);
3981         kfree(cm_dev);
3982 }
3983
3984 static int __init ib_cm_init(void)
3985 {
3986         int ret;
3987
3988         memset(&cm, 0, sizeof cm);
3989         INIT_LIST_HEAD(&cm.device_list);
3990         rwlock_init(&cm.device_lock);
3991         spin_lock_init(&cm.lock);
3992         cm.listen_service_table = RB_ROOT;
3993         cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID);
3994         cm.remote_id_table = RB_ROOT;
3995         cm.remote_qp_table = RB_ROOT;
3996         cm.remote_sidr_table = RB_ROOT;
3997         idr_init(&cm.local_id_table);
3998         get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand);
3999         INIT_LIST_HEAD(&cm.timewait_list);
4000
4001         ret = class_register(&cm_class);
4002         if (ret) {
4003                 ret = -ENOMEM;
4004                 goto error1;
4005         }
4006
4007         cm.wq = create_workqueue("ib_cm");
4008         if (!cm.wq) {
4009                 ret = -ENOMEM;
4010                 goto error2;
4011         }
4012
4013         ret = ib_register_client(&cm_client);
4014         if (ret)
4015                 goto error3;
4016
4017         return 0;
4018 error3:
4019         destroy_workqueue(cm.wq);
4020 error2:
4021         class_unregister(&cm_class);
4022 error1:
4023         idr_destroy(&cm.local_id_table);
4024         return ret;
4025 }
4026
4027 static void __exit ib_cm_cleanup(void)
4028 {
4029         struct cm_timewait_info *timewait_info, *tmp;
4030
4031         spin_lock_irq(&cm.lock);
4032         list_for_each_entry(timewait_info, &cm.timewait_list, list)
4033                 cancel_delayed_work(&timewait_info->work.work);
4034         spin_unlock_irq(&cm.lock);
4035
4036         ib_unregister_client(&cm_client);
4037         destroy_workqueue(cm.wq);
4038
4039         list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) {
4040                 list_del(&timewait_info->list);
4041                 kfree(timewait_info);
4042         }
4043
4044         class_unregister(&cm_class);
4045         idr_destroy(&cm.local_id_table);
4046 }
4047
4048 module_init(ib_cm_init);
4049 module_exit(ib_cm_cleanup);
4050