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