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

   1 /*
   2  * Copyright (c) 2004, 2005 Voltaire, Inc. All rights reserved.
   3  * Copyright (c) 2005 Intel Corporation.  All rights reserved.
   4  * Copyright (c) 2005 Mellanox Technologies Ltd.  All rights reserved.
   5  *
   6  * This software is available to you under a choice of one of two
   7  * licenses.  You may choose to be licensed under the terms of the GNU
   8  * General Public License (GPL) Version 2, available from the file
   9  * COPYING in the main directory of this source tree, or the
  10  * OpenIB.org BSD license below:
  11  *
  12  *     Redistribution and use in source and binary forms, with or
  13  *     without modification, are permitted provided that the following
  14  *     conditions are met:
  15  *
  16  *      - Redistributions of source code must retain the above
  17  *        copyright notice, this list of conditions and the following
  18  *        disclaimer.
  19  *
  20  *      - Redistributions in binary form must reproduce the above
  21  *        copyright notice, this list of conditions and the following
  22  *        disclaimer in the documentation and/or other materials
  23  *        provided with the distribution.
  24  *
  25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  32  * SOFTWARE.
  33  *
  34  * $Id: mad.c 5596 2006-03-03 01:00:07Z sean.hefty $
  35  */
  36 #include <linux/dma-mapping.h>
  37 #include <rdma/ib_cache.h>
  38
  39 #include "mad_priv.h"
  40 #include "mad_rmpp.h"
  41 #include "smi.h"
  42 #include "agent.h"
  43
  44 MODULE_LICENSE("Dual BSD/GPL");
  45 MODULE_DESCRIPTION("kernel IB MAD API");
  46 MODULE_AUTHOR("Hal Rosenstock");
  47 MODULE_AUTHOR("Sean Hefty");
  48
  49 static kmem_cache_t *ib_mad_cache;
  50
  51 static struct list_head ib_mad_port_list;
  52 static u32 ib_mad_client_id = 0;
  53
  54 /* Port list lock */
  55 static spinlock_t ib_mad_port_list_lock;
  56
  57
  58 /* Forward declarations */
  59 static int method_in_use(struct ib_mad_mgmt_method_table **method,
  60                          struct ib_mad_reg_req *mad_reg_req);
  61 static void remove_mad_reg_req(struct ib_mad_agent_private *priv);
  62 static struct ib_mad_agent_private *find_mad_agent(
  63                                         struct ib_mad_port_private *port_priv,
  64                                         struct ib_mad *mad);
  65 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
  66                                     struct ib_mad_private *mad);
  67 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv);
  68 static void timeout_sends(void *data);
  69 static void local_completions(void *data);
  70 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
  71                               struct ib_mad_agent_private *agent_priv,
  72                               u8 mgmt_class);
  73 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
  74                            struct ib_mad_agent_private *agent_priv);
  75
  76 /*
  77  * Returns a ib_mad_port_private structure or NULL for a device/port
  78  * Assumes ib_mad_port_list_lock is being held
  79  */
  80 static inline struct ib_mad_port_private *
  81 __ib_get_mad_port(struct ib_device *device, int port_num)
  82 {
  83         struct ib_mad_port_private *entry;
  84
  85         list_for_each_entry(entry, &ib_mad_port_list, port_list) {
  86                 if (entry->device == device && entry->port_num == port_num)
  87                         return entry;
  88         }
  89         return NULL;
  90 }
  91
  92 /*
  93  * Wrapper function to return a ib_mad_port_private structure or NULL
  94  * for a device/port
  95  */
  96 static inline struct ib_mad_port_private *
  97 ib_get_mad_port(struct ib_device *device, int port_num)
  98 {
  99         struct ib_mad_port_private *entry;
 100         unsigned long flags;
 101
 102         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
 103         entry = __ib_get_mad_port(device, port_num);
 104         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
 105
 106         return entry;
 107 }
 108
 109 static inline u8 convert_mgmt_class(u8 mgmt_class)
 110 {
 111         /* Alias IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE to 0 */
 112         return mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE ?
 113                 0 : mgmt_class;
 114 }
 115
 116 static int get_spl_qp_index(enum ib_qp_type qp_type)
 117 {
 118         switch (qp_type)
 119         {
 120         case IB_QPT_SMI:
 121                 return 0;
 122         case IB_QPT_GSI:
 123                 return 1;
 124         default:
 125                 return -1;
 126         }
 127 }
 128
 129 static int vendor_class_index(u8 mgmt_class)
 130 {
 131         return mgmt_class - IB_MGMT_CLASS_VENDOR_RANGE2_START;
 132 }
 133
 134 static int is_vendor_class(u8 mgmt_class)
 135 {
 136         if ((mgmt_class < IB_MGMT_CLASS_VENDOR_RANGE2_START) ||
 137             (mgmt_class > IB_MGMT_CLASS_VENDOR_RANGE2_END))
 138                 return 0;
 139         return 1;
 140 }
 141
 142 static int is_vendor_oui(char *oui)
 143 {
 144         if (oui[0] || oui[1] || oui[2])
 145                 return 1;
 146         return 0;
 147 }
 148
 149 static int is_vendor_method_in_use(
 150                 struct ib_mad_mgmt_vendor_class *vendor_class,
 151                 struct ib_mad_reg_req *mad_reg_req)
 152 {
 153         struct ib_mad_mgmt_method_table *method;
 154         int i;
 155
 156         for (i = 0; i < MAX_MGMT_OUI; i++) {
 157                 if (!memcmp(vendor_class->oui[i], mad_reg_req->oui, 3)) {
 158                         method = vendor_class->method_table[i];
 159                         if (method) {
 160                                 if (method_in_use(&method, mad_reg_req))
 161                                         return 1;
 162                                 else
 163                                         break;
 164                         }
 165                 }
 166         }
 167         return 0;
 168 }
 169
 170 /*
 171  * ib_register_mad_agent - Register to send/receive MADs
 172  */
 173 struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
 174                                            u8 port_num,
 175                                            enum ib_qp_type qp_type,
 176                                            struct ib_mad_reg_req *mad_reg_req,
 177                                            u8 rmpp_version,
 178                                            ib_mad_send_handler send_handler,
 179                                            ib_mad_recv_handler recv_handler,
 180                                            void *context)
 181 {
 182         struct ib_mad_port_private *port_priv;
 183         struct ib_mad_agent *ret = ERR_PTR(-EINVAL);
 184         struct ib_mad_agent_private *mad_agent_priv;
 185         struct ib_mad_reg_req *reg_req = NULL;
 186         struct ib_mad_mgmt_class_table *class;
 187         struct ib_mad_mgmt_vendor_class_table *vendor;
 188         struct ib_mad_mgmt_vendor_class *vendor_class;
 189         struct ib_mad_mgmt_method_table *method;
 190         int ret2, qpn;
 191         unsigned long flags;
 192         u8 mgmt_class, vclass;
 193
 194         /* Validate parameters */
 195         qpn = get_spl_qp_index(qp_type);
 196         if (qpn == -1)
 197                 goto error1;
 198
 199         if (rmpp_version && rmpp_version != IB_MGMT_RMPP_VERSION)
 200                 goto error1;
 201
 202         /* Validate MAD registration request if supplied */
 203         if (mad_reg_req) {
 204                 if (mad_reg_req->mgmt_class_version >= MAX_MGMT_VERSION)
 205                         goto error1;
 206                 if (!recv_handler)
 207                         goto error1;
 208                 if (mad_reg_req->mgmt_class >= MAX_MGMT_CLASS) {
 209                         /*
 210                          * IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE is the only
 211                          * one in this range currently allowed
 212                          */
 213                         if (mad_reg_req->mgmt_class !=
 214                             IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
 215                                 goto error1;
 216                 } else if (mad_reg_req->mgmt_class == 0) {
 217                         /*
 218                          * Class 0 is reserved in IBA and is used for
 219                          * aliasing of IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE
 220                          */
 221                         goto error1;
 222                 } else if (is_vendor_class(mad_reg_req->mgmt_class)) {
 223                         /*
 224                          * If class is in "new" vendor range,
 225                          * ensure supplied OUI is not zero
 226                          */
 227                         if (!is_vendor_oui(mad_reg_req->oui))
 228                                 goto error1;
 229                 }
 230                 /* Make sure class supplied is consistent with RMPP */
 231                 if (!ib_is_mad_class_rmpp(mad_reg_req->mgmt_class)) {
 232                         if (rmpp_version)
 233                                 goto error1;
 234                 }
 235                 /* Make sure class supplied is consistent with QP type */
 236                 if (qp_type == IB_QPT_SMI) {
 237                         if ((mad_reg_req->mgmt_class !=
 238                                         IB_MGMT_CLASS_SUBN_LID_ROUTED) &&
 239                             (mad_reg_req->mgmt_class !=
 240                                         IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
 241                                 goto error1;
 242                 } else {
 243                         if ((mad_reg_req->mgmt_class ==
 244                                         IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
 245                             (mad_reg_req->mgmt_class ==
 246                                         IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
 247                                 goto error1;
 248                 }
 249         } else {
 250                 /* No registration request supplied */
 251                 if (!send_handler)
 252                         goto error1;
 253         }
 254
 255         /* Validate device and port */
 256         port_priv = ib_get_mad_port(device, port_num);
 257         if (!port_priv) {
 258                 ret = ERR_PTR(-ENODEV);
 259                 goto error1;
 260         }
 261
 262         /* Allocate structures */
 263         mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL);
 264         if (!mad_agent_priv) {
 265                 ret = ERR_PTR(-ENOMEM);
 266                 goto error1;
 267         }
 268
 269         mad_agent_priv->agent.mr = ib_get_dma_mr(port_priv->qp_info[qpn].qp->pd,
 270                                                  IB_ACCESS_LOCAL_WRITE);
 271         if (IS_ERR(mad_agent_priv->agent.mr)) {
 272                 ret = ERR_PTR(-ENOMEM);
 273                 goto error2;
 274         }
 275
 276         if (mad_reg_req) {
 277                 reg_req = kmalloc(sizeof *reg_req, GFP_KERNEL);
 278                 if (!reg_req) {
 279                         ret = ERR_PTR(-ENOMEM);
 280                         goto error3;
 281                 }
 282                 /* Make a copy of the MAD registration request */
 283                 memcpy(reg_req, mad_reg_req, sizeof *reg_req);
 284         }
 285
 286         /* Now, fill in the various structures */
 287         mad_agent_priv->qp_info = &port_priv->qp_info[qpn];
 288         mad_agent_priv->reg_req = reg_req;
 289         mad_agent_priv->agent.rmpp_version = rmpp_version;
 290         mad_agent_priv->agent.device = device;
 291         mad_agent_priv->agent.recv_handler = recv_handler;
 292         mad_agent_priv->agent.send_handler = send_handler;
 293         mad_agent_priv->agent.context = context;
 294         mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp;
 295         mad_agent_priv->agent.port_num = port_num;
 296
 297         spin_lock_irqsave(&port_priv->reg_lock, flags);
 298         mad_agent_priv->agent.hi_tid = ++ib_mad_client_id;
 299
 300         /*
 301          * Make sure MAD registration (if supplied)
 302          * is non overlapping with any existing ones
 303          */
 304         if (mad_reg_req) {
 305                 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class);
 306                 if (!is_vendor_class(mgmt_class)) {
 307                         class = port_priv->version[mad_reg_req->
 308                                                    mgmt_class_version].class;
 309                         if (class) {
 310                                 method = class->method_table[mgmt_class];
 311                                 if (method) {
 312                                         if (method_in_use(&method,
 313                                                            mad_reg_req))
 314                                                 goto error4;
 315                                 }
 316                         }
 317                         ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv,
 318                                                   mgmt_class);
 319                 } else {
 320                         /* "New" vendor class range */
 321                         vendor = port_priv->version[mad_reg_req->
 322                                                     mgmt_class_version].vendor;
 323                         if (vendor) {
 324                                 vclass = vendor_class_index(mgmt_class);
 325                                 vendor_class = vendor->vendor_class[vclass];
 326                                 if (vendor_class) {
 327                                         if (is_vendor_method_in_use(
 328                                                         vendor_class,
 329                                                         mad_reg_req))
 330                                                 goto error4;
 331                                 }
 332                         }
 333                         ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv);
 334                 }
 335                 if (ret2) {
 336                         ret = ERR_PTR(ret2);
 337                         goto error4;
 338                 }
 339         }
 340
 341         /* Add mad agent into port's agent list */
 342         list_add_tail(&mad_agent_priv->agent_list, &port_priv->agent_list);
 343         spin_unlock_irqrestore(&port_priv->reg_lock, flags);
 344
 345         spin_lock_init(&mad_agent_priv->lock);
 346         INIT_LIST_HEAD(&mad_agent_priv->send_list);
 347         INIT_LIST_HEAD(&mad_agent_priv->wait_list);
 348         INIT_LIST_HEAD(&mad_agent_priv->done_list);
 349         INIT_LIST_HEAD(&mad_agent_priv->rmpp_list);
 350         INIT_WORK(&mad_agent_priv->timed_work, timeout_sends, mad_agent_priv);
 351         INIT_LIST_HEAD(&mad_agent_priv->local_list);
 352         INIT_WORK(&mad_agent_priv->local_work, local_completions,
 353                    mad_agent_priv);
 354         atomic_set(&mad_agent_priv->refcount, 1);
 355         init_completion(&mad_agent_priv->comp);
 356
 357         return &mad_agent_priv->agent;
 358
 359 error4:
 360         spin_unlock_irqrestore(&port_priv->reg_lock, flags);
 361         kfree(reg_req);
 362 error3:
 363         ib_dereg_mr(mad_agent_priv->agent.mr);
 364 error2:
 365         kfree(mad_agent_priv);
 366 error1:
 367         return ret;
 368 }
 369 EXPORT_SYMBOL(ib_register_mad_agent);
 370
 371 static inline int is_snooping_sends(int mad_snoop_flags)
 372 {
 373         return (mad_snoop_flags &
 374                 (/*IB_MAD_SNOOP_POSTED_SENDS |
 375                  IB_MAD_SNOOP_RMPP_SENDS |*/
 376                  IB_MAD_SNOOP_SEND_COMPLETIONS /*|
 377                  IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS*/));
 378 }
 379
 380 static inline int is_snooping_recvs(int mad_snoop_flags)
 381 {
 382         return (mad_snoop_flags &
 383                 (IB_MAD_SNOOP_RECVS /*|
 384                  IB_MAD_SNOOP_RMPP_RECVS*/));
 385 }
 386
 387 static int register_snoop_agent(struct ib_mad_qp_info *qp_info,
 388                                 struct ib_mad_snoop_private *mad_snoop_priv)
 389 {
 390         struct ib_mad_snoop_private **new_snoop_table;
 391         unsigned long flags;
 392         int i;
 393
 394         spin_lock_irqsave(&qp_info->snoop_lock, flags);
 395         /* Check for empty slot in array. */
 396         for (i = 0; i < qp_info->snoop_table_size; i++)
 397                 if (!qp_info->snoop_table[i])
 398                         break;
 399
 400         if (i == qp_info->snoop_table_size) {
 401                 /* Grow table. */
 402                 new_snoop_table = kmalloc(sizeof mad_snoop_priv *
 403                                           qp_info->snoop_table_size + 1,
 404                                           GFP_ATOMIC);
 405                 if (!new_snoop_table) {
 406                         i = -ENOMEM;
 407                         goto out;
 408                 }
 409                 if (qp_info->snoop_table) {
 410                         memcpy(new_snoop_table, qp_info->snoop_table,
 411                                sizeof mad_snoop_priv *
 412                                qp_info->snoop_table_size);
 413                         kfree(qp_info->snoop_table);
 414                 }
 415                 qp_info->snoop_table = new_snoop_table;
 416                 qp_info->snoop_table_size++;
 417         }
 418         qp_info->snoop_table[i] = mad_snoop_priv;
 419         atomic_inc(&qp_info->snoop_count);
 420 out:
 421         spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 422         return i;
 423 }
 424
 425 struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device,
 426                                            u8 port_num,
 427                                            enum ib_qp_type qp_type,
 428                                            int mad_snoop_flags,
 429                                            ib_mad_snoop_handler snoop_handler,
 430                                            ib_mad_recv_handler recv_handler,
 431                                            void *context)
 432 {
 433         struct ib_mad_port_private *port_priv;
 434         struct ib_mad_agent *ret;
 435         struct ib_mad_snoop_private *mad_snoop_priv;
 436         int qpn;
 437
 438         /* Validate parameters */
 439         if ((is_snooping_sends(mad_snoop_flags) && !snoop_handler) ||
 440             (is_snooping_recvs(mad_snoop_flags) && !recv_handler)) {
 441                 ret = ERR_PTR(-EINVAL);
 442                 goto error1;
 443         }
 444         qpn = get_spl_qp_index(qp_type);
 445         if (qpn == -1) {
 446                 ret = ERR_PTR(-EINVAL);
 447                 goto error1;
 448         }
 449         port_priv = ib_get_mad_port(device, port_num);
 450         if (!port_priv) {
 451                 ret = ERR_PTR(-ENODEV);
 452                 goto error1;
 453         }
 454         /* Allocate structures */
 455         mad_snoop_priv = kzalloc(sizeof *mad_snoop_priv, GFP_KERNEL);
 456         if (!mad_snoop_priv) {
 457                 ret = ERR_PTR(-ENOMEM);
 458                 goto error1;
 459         }
 460
 461         /* Now, fill in the various structures */
 462         mad_snoop_priv->qp_info = &port_priv->qp_info[qpn];
 463         mad_snoop_priv->agent.device = device;
 464         mad_snoop_priv->agent.recv_handler = recv_handler;
 465         mad_snoop_priv->agent.snoop_handler = snoop_handler;
 466         mad_snoop_priv->agent.context = context;
 467         mad_snoop_priv->agent.qp = port_priv->qp_info[qpn].qp;
 468         mad_snoop_priv->agent.port_num = port_num;
 469         mad_snoop_priv->mad_snoop_flags = mad_snoop_flags;
 470         init_completion(&mad_snoop_priv->comp);
 471         mad_snoop_priv->snoop_index = register_snoop_agent(
 472                                                 &port_priv->qp_info[qpn],
 473                                                 mad_snoop_priv);
 474         if (mad_snoop_priv->snoop_index < 0) {
 475                 ret = ERR_PTR(mad_snoop_priv->snoop_index);
 476                 goto error2;
 477         }
 478
 479         atomic_set(&mad_snoop_priv->refcount, 1);
 480         return &mad_snoop_priv->agent;
 481
 482 error2:
 483         kfree(mad_snoop_priv);
 484 error1:
 485         return ret;
 486 }
 487 EXPORT_SYMBOL(ib_register_mad_snoop);
 488
 489 static inline void deref_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
 490 {
 491         if (atomic_dec_and_test(&mad_agent_priv->refcount))
 492                 complete(&mad_agent_priv->comp);
 493 }
 494
 495 static inline void deref_snoop_agent(struct ib_mad_snoop_private *mad_snoop_priv)
 496 {
 497         if (atomic_dec_and_test(&mad_snoop_priv->refcount))
 498                 complete(&mad_snoop_priv->comp);
 499 }
 500
 501 static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
 502 {
 503         struct ib_mad_port_private *port_priv;
 504         unsigned long flags;
 505
 506         /* Note that we could still be handling received MADs */
 507
 508         /*
 509          * Canceling all sends results in dropping received response
 510          * MADs, preventing us from queuing additional work
 511          */
 512         cancel_mads(mad_agent_priv);
 513         port_priv = mad_agent_priv->qp_info->port_priv;
 514         cancel_delayed_work(&mad_agent_priv->timed_work);
 515
 516         spin_lock_irqsave(&port_priv->reg_lock, flags);
 517         remove_mad_reg_req(mad_agent_priv);
 518         list_del(&mad_agent_priv->agent_list);
 519         spin_unlock_irqrestore(&port_priv->reg_lock, flags);
 520
 521         flush_workqueue(port_priv->wq);
 522         ib_cancel_rmpp_recvs(mad_agent_priv);
 523
 524         deref_mad_agent(mad_agent_priv);
 525         wait_for_completion(&mad_agent_priv->comp);
 526
 527         kfree(mad_agent_priv->reg_req);
 528         ib_dereg_mr(mad_agent_priv->agent.mr);
 529         kfree(mad_agent_priv);
 530 }
 531
 532 static void unregister_mad_snoop(struct ib_mad_snoop_private *mad_snoop_priv)
 533 {
 534         struct ib_mad_qp_info *qp_info;
 535         unsigned long flags;
 536
 537         qp_info = mad_snoop_priv->qp_info;
 538         spin_lock_irqsave(&qp_info->snoop_lock, flags);
 539         qp_info->snoop_table[mad_snoop_priv->snoop_index] = NULL;
 540         atomic_dec(&qp_info->snoop_count);
 541         spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 542
 543         deref_snoop_agent(mad_snoop_priv);
 544         wait_for_completion(&mad_snoop_priv->comp);
 545
 546         kfree(mad_snoop_priv);
 547 }
 548
 549 /*
 550  * ib_unregister_mad_agent - Unregisters a client from using MAD services
 551  */
 552 int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent)
 553 {
 554         struct ib_mad_agent_private *mad_agent_priv;
 555         struct ib_mad_snoop_private *mad_snoop_priv;
 556
 557         /* If the TID is zero, the agent can only snoop. */
 558         if (mad_agent->hi_tid) {
 559                 mad_agent_priv = container_of(mad_agent,
 560                                               struct ib_mad_agent_private,
 561                                               agent);
 562                 unregister_mad_agent(mad_agent_priv);
 563         } else {
 564                 mad_snoop_priv = container_of(mad_agent,
 565                                               struct ib_mad_snoop_private,
 566                                               agent);
 567                 unregister_mad_snoop(mad_snoop_priv);
 568         }
 569         return 0;
 570 }
 571 EXPORT_SYMBOL(ib_unregister_mad_agent);
 572
 573 static inline int response_mad(struct ib_mad *mad)
 574 {
 575         /* Trap represses are responses although response bit is reset */
 576         return ((mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS) ||
 577                 (mad->mad_hdr.method & IB_MGMT_METHOD_RESP));
 578 }
 579
 580 static void dequeue_mad(struct ib_mad_list_head *mad_list)
 581 {
 582         struct ib_mad_queue *mad_queue;
 583         unsigned long flags;
 584
 585         BUG_ON(!mad_list->mad_queue);
 586         mad_queue = mad_list->mad_queue;
 587         spin_lock_irqsave(&mad_queue->lock, flags);
 588         list_del(&mad_list->list);
 589         mad_queue->count--;
 590         spin_unlock_irqrestore(&mad_queue->lock, flags);
 591 }
 592
 593 static void snoop_send(struct ib_mad_qp_info *qp_info,
 594                        struct ib_mad_send_buf *send_buf,
 595                        struct ib_mad_send_wc *mad_send_wc,
 596                        int mad_snoop_flags)
 597 {
 598         struct ib_mad_snoop_private *mad_snoop_priv;
 599         unsigned long flags;
 600         int i;
 601
 602         spin_lock_irqsave(&qp_info->snoop_lock, flags);
 603         for (i = 0; i < qp_info->snoop_table_size; i++) {
 604                 mad_snoop_priv = qp_info->snoop_table[i];
 605                 if (!mad_snoop_priv ||
 606                     !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
 607                         continue;
 608
 609                 atomic_inc(&mad_snoop_priv->refcount);
 610                 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 611                 mad_snoop_priv->agent.snoop_handler(&mad_snoop_priv->agent,
 612                                                     send_buf, mad_send_wc);
 613                 deref_snoop_agent(mad_snoop_priv);
 614                 spin_lock_irqsave(&qp_info->snoop_lock, flags);
 615         }
 616         spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 617 }
 618
 619 static void snoop_recv(struct ib_mad_qp_info *qp_info,
 620                        struct ib_mad_recv_wc *mad_recv_wc,
 621                        int mad_snoop_flags)
 622 {
 623         struct ib_mad_snoop_private *mad_snoop_priv;
 624         unsigned long flags;
 625         int i;
 626
 627         spin_lock_irqsave(&qp_info->snoop_lock, flags);
 628         for (i = 0; i < qp_info->snoop_table_size; i++) {
 629                 mad_snoop_priv = qp_info->snoop_table[i];
 630                 if (!mad_snoop_priv ||
 631                     !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
 632                         continue;
 633
 634                 atomic_inc(&mad_snoop_priv->refcount);
 635                 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 636                 mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent,
 637                                                    mad_recv_wc);
 638                 deref_snoop_agent(mad_snoop_priv);
 639                 spin_lock_irqsave(&qp_info->snoop_lock, flags);
 640         }
 641         spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 642 }
 643
 644 static void build_smp_wc(u64 wr_id, u16 slid, u16 pkey_index, u8 port_num,
 645                          struct ib_wc *wc)
 646 {
 647         memset(wc, 0, sizeof *wc);
 648         wc->wr_id = wr_id;
 649         wc->status = IB_WC_SUCCESS;
 650         wc->opcode = IB_WC_RECV;
 651         wc->pkey_index = pkey_index;
 652         wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh);
 653         wc->src_qp = IB_QP0;
 654         wc->qp_num = IB_QP0;
 655         wc->slid = slid;
 656         wc->sl = 0;
 657         wc->dlid_path_bits = 0;
 658         wc->port_num = port_num;
 659 }
 660
 661 /*
 662  * Return 0 if SMP is to be sent
 663  * Return 1 if SMP was consumed locally (whether or not solicited)
 664  * Return < 0 if error
 665  */
 666 static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv,
 667                                   struct ib_mad_send_wr_private *mad_send_wr)
 668 {
 669         int ret;
 670         struct ib_smp *smp = mad_send_wr->send_buf.mad;
 671         unsigned long flags;
 672         struct ib_mad_local_private *local;
 673         struct ib_mad_private *mad_priv;
 674         struct ib_mad_port_private *port_priv;
 675         struct ib_mad_agent_private *recv_mad_agent = NULL;
 676         struct ib_device *device = mad_agent_priv->agent.device;
 677         u8 port_num = mad_agent_priv->agent.port_num;
 678         struct ib_wc mad_wc;
 679         struct ib_send_wr *send_wr = &mad_send_wr->send_wr;
 680
 681         /*
 682          * Directed route handling starts if the initial LID routed part of
 683          * a request or the ending LID routed part of a response is empty.
 684          * If we are at the start of the LID routed part, don't update the
 685          * hop_ptr or hop_cnt.  See section 14.2.2, Vol 1 IB spec.
 686          */
 687         if ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) ==
 688              IB_LID_PERMISSIVE &&
 689             !smi_handle_dr_smp_send(smp, device->node_type, port_num)) {
 690                 ret = -EINVAL;
 691                 printk(KERN_ERR PFX "Invalid directed route\n");
 692                 goto out;
 693         }
 694         /* Check to post send on QP or process locally */
 695         ret = smi_check_local_smp(smp, device);
 696         if (!ret)
 697                 goto out;
 698
 699         local = kmalloc(sizeof *local, GFP_ATOMIC);
 700         if (!local) {
 701                 ret = -ENOMEM;
 702                 printk(KERN_ERR PFX "No memory for ib_mad_local_private\n");
 703                 goto out;
 704         }
 705         local->mad_priv = NULL;
 706         local->recv_mad_agent = NULL;
 707         mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_ATOMIC);
 708         if (!mad_priv) {
 709                 ret = -ENOMEM;
 710                 printk(KERN_ERR PFX "No memory for local response MAD\n");
 711                 kfree(local);
 712                 goto out;
 713         }
 714
 715         build_smp_wc(send_wr->wr_id, be16_to_cpu(smp->dr_slid),
 716                      send_wr->wr.ud.pkey_index,
 717                      send_wr->wr.ud.port_num, &mad_wc);
 718
 719         /* No GRH for DR SMP */
 720         ret = device->process_mad(device, 0, port_num, &mad_wc, NULL,
 721                                   (struct ib_mad *)smp,
 722                                   (struct ib_mad *)&mad_priv->mad);
 723         switch (ret)
 724         {
 725         case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
 726                 if (response_mad(&mad_priv->mad.mad) &&
 727                     mad_agent_priv->agent.recv_handler) {
 728                         local->mad_priv = mad_priv;
 729                         local->recv_mad_agent = mad_agent_priv;
 730                         /*
 731                          * Reference MAD agent until receive
 732                          * side of local completion handled
 733                          */
 734                         atomic_inc(&mad_agent_priv->refcount);
 735                 } else
 736                         kmem_cache_free(ib_mad_cache, mad_priv);
 737                 break;
 738         case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
 739                 kmem_cache_free(ib_mad_cache, mad_priv);
 740                 break;
 741         case IB_MAD_RESULT_SUCCESS:
 742                 /* Treat like an incoming receive MAD */
 743                 port_priv = ib_get_mad_port(mad_agent_priv->agent.device,
 744                                             mad_agent_priv->agent.port_num);
 745                 if (port_priv) {
 746                         mad_priv->mad.mad.mad_hdr.tid =
 747                                 ((struct ib_mad *)smp)->mad_hdr.tid;
 748                         recv_mad_agent = find_mad_agent(port_priv,
 749                                                         &mad_priv->mad.mad);
 750                 }
 751                 if (!port_priv || !recv_mad_agent) {
 752                         kmem_cache_free(ib_mad_cache, mad_priv);
 753                         kfree(local);
 754                         ret = 0;
 755                         goto out;
 756                 }
 757                 local->mad_priv = mad_priv;
 758                 local->recv_mad_agent = recv_mad_agent;
 759                 break;
 760         default:
 761                 kmem_cache_free(ib_mad_cache, mad_priv);
 762                 kfree(local);
 763                 ret = -EINVAL;
 764                 goto out;
 765         }
 766
 767         local->mad_send_wr = mad_send_wr;
 768         /* Reference MAD agent until send side of local completion handled */
 769         atomic_inc(&mad_agent_priv->refcount);
 770         /* Queue local completion to local list */
 771         spin_lock_irqsave(&mad_agent_priv->lock, flags);
 772         list_add_tail(&local->completion_list, &mad_agent_priv->local_list);
 773         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
 774         queue_work(mad_agent_priv->qp_info->port_priv->wq,
 775                    &mad_agent_priv->local_work);
 776         ret = 1;
 777 out:
 778         return ret;
 779 }
 780
 781 static int get_pad_size(int hdr_len, int data_len)
 782 {
 783         int seg_size, pad;
 784
 785         seg_size = sizeof(struct ib_mad) - hdr_len;
 786         if (data_len && seg_size) {
 787                 pad = seg_size - data_len % seg_size;
 788                 return pad == seg_size ? 0 : pad;
 789         } else
 790                 return seg_size;
 791 }
 792
 793 static void free_send_rmpp_list(struct ib_mad_send_wr_private *mad_send_wr)
 794 {
 795         struct ib_rmpp_segment *s, *t;
 796
 797         list_for_each_entry_safe(s, t, &mad_send_wr->rmpp_list, list) {
 798                 list_del(&s->list);
 799                 kfree(s);
 800         }
 801 }
 802
 803 static int alloc_send_rmpp_list(struct ib_mad_send_wr_private *send_wr,
 804                                 gfp_t gfp_mask)
 805 {
 806         struct ib_mad_send_buf *send_buf = &send_wr->send_buf;
 807         struct ib_rmpp_mad *rmpp_mad = send_buf->mad;
 808         struct ib_rmpp_segment *seg = NULL;
 809         int left, seg_size, pad;
 810
 811         send_buf->seg_size = sizeof (struct ib_mad) - send_buf->hdr_len;
 812         seg_size = send_buf->seg_size;
 813         pad = send_wr->pad;
 814
 815         /* Allocate data segments. */
 816         for (left = send_buf->data_len + pad; left > 0; left -= seg_size) {
 817                 seg = kmalloc(sizeof (*seg) + seg_size, gfp_mask);
 818                 if (!seg) {
 819                         printk(KERN_ERR "alloc_send_rmpp_segs: RMPP mem "
 820                                "alloc failed for len %zd, gfp %#x\n",
 821                                sizeof (*seg) + seg_size, gfp_mask);
 822                         free_send_rmpp_list(send_wr);
 823                         return -ENOMEM;
 824                 }
 825                 seg->num = ++send_buf->seg_count;
 826                 list_add_tail(&seg->list, &send_wr->rmpp_list);
 827         }
 828
 829         /* Zero any padding */
 830         if (pad)
 831                 memset(seg->data + seg_size - pad, 0, pad);
 832
 833         rmpp_mad->rmpp_hdr.rmpp_version = send_wr->mad_agent_priv->
 834                                           agent.rmpp_version;
 835         rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA;
 836         ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
 837
 838         send_wr->cur_seg = container_of(send_wr->rmpp_list.next,
 839                                         struct ib_rmpp_segment, list);
 840         send_wr->last_ack_seg = send_wr->cur_seg;
 841         return 0;
 842 }
 843
 844 struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
 845                                             u32 remote_qpn, u16 pkey_index,
 846                                             int rmpp_active,
 847                                             int hdr_len, int data_len,
 848                                             gfp_t gfp_mask)
 849 {
 850         struct ib_mad_agent_private *mad_agent_priv;
 851         struct ib_mad_send_wr_private *mad_send_wr;
 852         int pad, message_size, ret, size;
 853         void *buf;
 854
 855         mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
 856                                       agent);
 857         pad = get_pad_size(hdr_len, data_len);
 858         message_size = hdr_len + data_len + pad;
 859
 860         if ((!mad_agent->rmpp_version &&
 861              (rmpp_active || message_size > sizeof(struct ib_mad))) ||
 862             (!rmpp_active && message_size > sizeof(struct ib_mad)))
 863                 return ERR_PTR(-EINVAL);
 864
 865         size = rmpp_active ? hdr_len : sizeof(struct ib_mad);
 866         buf = kzalloc(sizeof *mad_send_wr + size, gfp_mask);
 867         if (!buf)
 868                 return ERR_PTR(-ENOMEM);
 869
 870         mad_send_wr = buf + size;
 871         INIT_LIST_HEAD(&mad_send_wr->rmpp_list);
 872         mad_send_wr->send_buf.mad = buf;
 873         mad_send_wr->send_buf.hdr_len = hdr_len;
 874         mad_send_wr->send_buf.data_len = data_len;
 875         mad_send_wr->pad = pad;
 876
 877         mad_send_wr->mad_agent_priv = mad_agent_priv;
 878         mad_send_wr->sg_list[0].length = hdr_len;
 879         mad_send_wr->sg_list[0].lkey = mad_agent->mr->lkey;
 880         mad_send_wr->sg_list[1].length = sizeof(struct ib_mad) - hdr_len;
 881         mad_send_wr->sg_list[1].lkey = mad_agent->mr->lkey;
 882
 883         mad_send_wr->send_wr.wr_id = (unsigned long) mad_send_wr;
 884         mad_send_wr->send_wr.sg_list = mad_send_wr->sg_list;
 885         mad_send_wr->send_wr.num_sge = 2;
 886         mad_send_wr->send_wr.opcode = IB_WR_SEND;
 887         mad_send_wr->send_wr.send_flags = IB_SEND_SIGNALED;
 888         mad_send_wr->send_wr.wr.ud.remote_qpn = remote_qpn;
 889         mad_send_wr->send_wr.wr.ud.remote_qkey = IB_QP_SET_QKEY;
 890         mad_send_wr->send_wr.wr.ud.pkey_index = pkey_index;
 891
 892         if (rmpp_active) {
 893                 ret = alloc_send_rmpp_list(mad_send_wr, gfp_mask);
 894                 if (ret) {
 895                         kfree(buf);
 896                         return ERR_PTR(ret);
 897                 }
 898         }
 899
 900         mad_send_wr->send_buf.mad_agent = mad_agent;
 901         atomic_inc(&mad_agent_priv->refcount);
 902         return &mad_send_wr->send_buf;
 903 }
 904 EXPORT_SYMBOL(ib_create_send_mad);
 905
 906 int ib_get_mad_data_offset(u8 mgmt_class)
 907 {
 908         if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM)
 909                 return IB_MGMT_SA_HDR;
 910         else if ((mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
 911                  (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
 912                  (mgmt_class == IB_MGMT_CLASS_BIS))
 913                 return IB_MGMT_DEVICE_HDR;
 914         else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
 915                  (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))
 916                 return IB_MGMT_VENDOR_HDR;
 917         else
 918                 return IB_MGMT_MAD_HDR;
 919 }
 920 EXPORT_SYMBOL(ib_get_mad_data_offset);
 921
 922 int ib_is_mad_class_rmpp(u8 mgmt_class)
 923 {
 924         if ((mgmt_class == IB_MGMT_CLASS_SUBN_ADM) ||
 925             (mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
 926             (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
 927             (mgmt_class == IB_MGMT_CLASS_BIS) ||
 928             ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
 929              (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)))
 930                 return 1;
 931         return 0;
 932 }
 933 EXPORT_SYMBOL(ib_is_mad_class_rmpp);
 934
 935 void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num)
 936 {
 937         struct ib_mad_send_wr_private *mad_send_wr;
 938         struct list_head *list;
 939
 940         mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
 941                                    send_buf);
 942         list = &mad_send_wr->cur_seg->list;
 943
 944         if (mad_send_wr->cur_seg->num < seg_num) {
 945                 list_for_each_entry(mad_send_wr->cur_seg, list, list)
 946                         if (mad_send_wr->cur_seg->num == seg_num)
 947                                 break;
 948         } else if (mad_send_wr->cur_seg->num > seg_num) {
 949                 list_for_each_entry_reverse(mad_send_wr->cur_seg, list, list)
 950                         if (mad_send_wr->cur_seg->num == seg_num)
 951                                 break;
 952         }
 953         return mad_send_wr->cur_seg->data;
 954 }
 955 EXPORT_SYMBOL(ib_get_rmpp_segment);
 956
 957 static inline void *ib_get_payload(struct ib_mad_send_wr_private *mad_send_wr)
 958 {
 959         if (mad_send_wr->send_buf.seg_count)
 960                 return ib_get_rmpp_segment(&mad_send_wr->send_buf,
 961                                            mad_send_wr->seg_num);
 962         else
 963                 return mad_send_wr->send_buf.mad +
 964                        mad_send_wr->send_buf.hdr_len;
 965 }
 966
 967 void ib_free_send_mad(struct ib_mad_send_buf *send_buf)
 968 {
 969         struct ib_mad_agent_private *mad_agent_priv;
 970         struct ib_mad_send_wr_private *mad_send_wr;
 971
 972         mad_agent_priv = container_of(send_buf->mad_agent,
 973                                       struct ib_mad_agent_private, agent);
 974         mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
 975                                    send_buf);
 976
 977         free_send_rmpp_list(mad_send_wr);
 978         kfree(send_buf->mad);
 979         deref_mad_agent(mad_agent_priv);
 980 }
 981 EXPORT_SYMBOL(ib_free_send_mad);
 982
 983 int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr)
 984 {
 985         struct ib_mad_qp_info *qp_info;
 986         struct list_head *list;
 987         struct ib_send_wr *bad_send_wr;
 988         struct ib_mad_agent *mad_agent;
 989         struct ib_sge *sge;
 990         unsigned long flags;
 991         int ret;
 992
 993         /* Set WR ID to find mad_send_wr upon completion */
 994         qp_info = mad_send_wr->mad_agent_priv->qp_info;
 995         mad_send_wr->send_wr.wr_id = (unsigned long)&mad_send_wr->mad_list;
 996         mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;
 997
 998         mad_agent = mad_send_wr->send_buf.mad_agent;
 999         sge = mad_send_wr->sg_list;
1000         sge[0].addr = dma_map_single(mad_agent->device->dma_device,
1001                                      mad_send_wr->send_buf.mad,
1002                                      sge[0].length,
1003                                      DMA_TO_DEVICE);
1004         pci_unmap_addr_set(mad_send_wr, header_mapping, sge[0].addr);
1005
1006         sge[1].addr = dma_map_single(mad_agent->device->dma_device,
1007                                      ib_get_payload(mad_send_wr),
1008                                      sge[1].length,
1009                                      DMA_TO_DEVICE);
1010         pci_unmap_addr_set(mad_send_wr, payload_mapping, sge[1].addr);
1011
1012         spin_lock_irqsave(&qp_info->send_queue.lock, flags);
1013         if (qp_info->send_queue.count < qp_info->send_queue.max_active) {
1014                 ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr,
1015                                    &bad_send_wr);
1016                 list = &qp_info->send_queue.list;
1017         } else {
1018                 ret = 0;
1019                 list = &qp_info->overflow_list;
1020         }
1021
1022         if (!ret) {
1023                 qp_info->send_queue.count++;
1024                 list_add_tail(&mad_send_wr->mad_list.list, list);
1025         }
1026         spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
1027         if (ret) {
1028                 dma_unmap_single(mad_agent->device->dma_device,
1029                                  pci_unmap_addr(mad_send_wr, header_mapping),
1030                                  sge[0].length, DMA_TO_DEVICE);
1031                 dma_unmap_single(mad_agent->device->dma_device,
1032                                  pci_unmap_addr(mad_send_wr, payload_mapping),
1033                                  sge[1].length, DMA_TO_DEVICE);
1034         }
1035         return ret;
1036 }
1037
1038 /*
1039  * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
1040  *  with the registered client
1041  */
1042 int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
1043                      struct ib_mad_send_buf **bad_send_buf)
1044 {
1045         struct ib_mad_agent_private *mad_agent_priv;
1046         struct ib_mad_send_buf *next_send_buf;
1047         struct ib_mad_send_wr_private *mad_send_wr;
1048         unsigned long flags;
1049         int ret = -EINVAL;
1050
1051         /* Walk list of send WRs and post each on send list */
1052         for (; send_buf; send_buf = next_send_buf) {
1053
1054                 mad_send_wr = container_of(send_buf,
1055                                            struct ib_mad_send_wr_private,
1056                                            send_buf);
1057                 mad_agent_priv = mad_send_wr->mad_agent_priv;
1058
1059                 if (!send_buf->mad_agent->send_handler ||
1060                     (send_buf->timeout_ms &&
1061                      !send_buf->mad_agent->recv_handler)) {
1062                         ret = -EINVAL;
1063                         goto error;
1064                 }
1065
1066                 if (!ib_is_mad_class_rmpp(((struct ib_mad_hdr *) send_buf->mad)->mgmt_class)) {
1067                         if (mad_agent_priv->agent.rmpp_version) {
1068                                 ret = -EINVAL;
1069                                 goto error;
1070                         }
1071                 }
1072
1073                 /*
1074                  * Save pointer to next work request to post in case the
1075                  * current one completes, and the user modifies the work
1076                  * request associated with the completion
1077                  */
1078                 next_send_buf = send_buf->next;
1079                 mad_send_wr->send_wr.wr.ud.ah = send_buf->ah;
1080
1081                 if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class ==
1082                     IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1083                         ret = handle_outgoing_dr_smp(mad_agent_priv,
1084                                                      mad_send_wr);
1085                         if (ret < 0)            /* error */
1086                                 goto error;
1087                         else if (ret == 1)      /* locally consumed */
1088                                 continue;
1089                 }
1090
1091                 mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid;
1092                 /* Timeout will be updated after send completes */
1093                 mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms);
1094                 mad_send_wr->retries = send_buf->retries;
1095                 /* Reference for work request to QP + response */
1096                 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0);
1097                 mad_send_wr->status = IB_WC_SUCCESS;
1098
1099                 /* Reference MAD agent until send completes */
1100                 atomic_inc(&mad_agent_priv->refcount);
1101                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1102                 list_add_tail(&mad_send_wr->agent_list,
1103                               &mad_agent_priv->send_list);
1104                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1105
1106                 if (mad_agent_priv->agent.rmpp_version) {
1107                         ret = ib_send_rmpp_mad(mad_send_wr);
1108                         if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED)
1109                                 ret = ib_send_mad(mad_send_wr);
1110                 } else
1111                         ret = ib_send_mad(mad_send_wr);
1112                 if (ret < 0) {
1113                         /* Fail send request */
1114                         spin_lock_irqsave(&mad_agent_priv->lock, flags);
1115                         list_del(&mad_send_wr->agent_list);
1116                         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1117                         atomic_dec(&mad_agent_priv->refcount);
1118                         goto error;
1119                 }
1120         }
1121         return 0;
1122 error:
1123         if (bad_send_buf)
1124                 *bad_send_buf = send_buf;
1125         return ret;
1126 }
1127 EXPORT_SYMBOL(ib_post_send_mad);
1128
1129 /*
1130  * ib_free_recv_mad - Returns data buffers used to receive
1131  *  a MAD to the access layer
1132  */
1133 void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc)
1134 {
1135         struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf;
1136         struct ib_mad_private_header *mad_priv_hdr;
1137         struct ib_mad_private *priv;
1138         struct list_head free_list;
1139
1140         INIT_LIST_HEAD(&free_list);
1141         list_splice_init(&mad_recv_wc->rmpp_list, &free_list);
1142
1143         list_for_each_entry_safe(mad_recv_buf, temp_recv_buf,
1144                                         &free_list, list) {
1145                 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc,
1146                                            recv_buf);
1147                 mad_priv_hdr = container_of(mad_recv_wc,
1148                                             struct ib_mad_private_header,
1149                                             recv_wc);
1150                 priv = container_of(mad_priv_hdr, struct ib_mad_private,
1151                                     header);
1152                 kmem_cache_free(ib_mad_cache, priv);
1153         }
1154 }
1155 EXPORT_SYMBOL(ib_free_recv_mad);
1156
1157 struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
1158                                         u8 rmpp_version,
1159                                         ib_mad_send_handler send_handler,
1160                                         ib_mad_recv_handler recv_handler,
1161                                         void *context)
1162 {
1163         return ERR_PTR(-EINVAL);        /* XXX: for now */
1164 }
1165 EXPORT_SYMBOL(ib_redirect_mad_qp);
1166
1167 int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
1168                       struct ib_wc *wc)
1169 {
1170         printk(KERN_ERR PFX "ib_process_mad_wc() not implemented yet\n");
1171         return 0;
1172 }
1173 EXPORT_SYMBOL(ib_process_mad_wc);
1174
1175 static int method_in_use(struct ib_mad_mgmt_method_table **method,
1176                          struct ib_mad_reg_req *mad_reg_req)
1177 {
1178         int i;
1179
1180         for (i = find_first_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS);
1181              i < IB_MGMT_MAX_METHODS;
1182              i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1183                                1+i)) {
1184                 if ((*method)->agent[i]) {
1185                         printk(KERN_ERR PFX "Method %d already in use\n", i);
1186                         return -EINVAL;
1187                 }
1188         }
1189         return 0;
1190 }
1191
1192 static int allocate_method_table(struct ib_mad_mgmt_method_table **method)
1193 {
1194         /* Allocate management method table */
1195         *method = kzalloc(sizeof **method, GFP_ATOMIC);
1196         if (!*method) {
1197                 printk(KERN_ERR PFX "No memory for "
1198                        "ib_mad_mgmt_method_table\n");
1199                 return -ENOMEM;
1200         }
1201
1202         return 0;
1203 }
1204
1205 /*
1206  * Check to see if there are any methods still in use
1207  */
1208 static int check_method_table(struct ib_mad_mgmt_method_table *method)
1209 {
1210         int i;
1211
1212         for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
1213                 if (method->agent[i])
1214                         return 1;
1215         return 0;
1216 }
1217
1218 /*
1219  * Check to see if there are any method tables for this class still in use
1220  */
1221 static int check_class_table(struct ib_mad_mgmt_class_table *class)
1222 {
1223         int i;
1224
1225         for (i = 0; i < MAX_MGMT_CLASS; i++)
1226                 if (class->method_table[i])
1227                         return 1;
1228         return 0;
1229 }
1230
1231 static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class)
1232 {
1233         int i;
1234
1235         for (i = 0; i < MAX_MGMT_OUI; i++)
1236                 if (vendor_class->method_table[i])
1237                         return 1;
1238         return 0;
1239 }
1240
1241 static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class,
1242                            char *oui)
1243 {
1244         int i;
1245
1246         for (i = 0; i < MAX_MGMT_OUI; i++)
1247                 /* Is there matching OUI for this vendor class ? */
1248                 if (!memcmp(vendor_class->oui[i], oui, 3))
1249                         return i;
1250
1251         return -1;
1252 }
1253
1254 static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor)
1255 {
1256         int i;
1257
1258         for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++)
1259                 if (vendor->vendor_class[i])
1260                         return 1;
1261
1262         return 0;
1263 }
1264
1265 static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method,
1266                                      struct ib_mad_agent_private *agent)
1267 {
1268         int i;
1269
1270         /* Remove any methods for this mad agent */
1271         for (i = 0; i < IB_MGMT_MAX_METHODS; i++) {
1272                 if (method->agent[i] == agent) {
1273                         method->agent[i] = NULL;
1274                 }
1275         }
1276 }
1277
1278 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1279                               struct ib_mad_agent_private *agent_priv,
1280                               u8 mgmt_class)
1281 {
1282         struct ib_mad_port_private *port_priv;
1283         struct ib_mad_mgmt_class_table **class;
1284         struct ib_mad_mgmt_method_table **method;
1285         int i, ret;
1286
1287         port_priv = agent_priv->qp_info->port_priv;
1288         class = &port_priv->version[mad_reg_req->mgmt_class_version].class;
1289         if (!*class) {
1290                 /* Allocate management class table for "new" class version */
1291                 *class = kzalloc(sizeof **class, GFP_ATOMIC);
1292                 if (!*class) {
1293                         printk(KERN_ERR PFX "No memory for "
1294                                "ib_mad_mgmt_class_table\n");
1295                         ret = -ENOMEM;
1296                         goto error1;
1297                 }
1298
1299                 /* Allocate method table for this management class */
1300                 method = &(*class)->method_table[mgmt_class];
1301                 if ((ret = allocate_method_table(method)))
1302                         goto error2;
1303         } else {
1304                 method = &(*class)->method_table[mgmt_class];
1305                 if (!*method) {
1306                         /* Allocate method table for this management class */
1307                         if ((ret = allocate_method_table(method)))
1308                                 goto error1;
1309                 }
1310         }
1311
1312         /* Now, make sure methods are not already in use */
1313         if (method_in_use(method, mad_reg_req))
1314                 goto error3;
1315
1316         /* Finally, add in methods being registered */
1317         for (i = find_first_bit(mad_reg_req->method_mask,
1318                                 IB_MGMT_MAX_METHODS);
1319              i < IB_MGMT_MAX_METHODS;
1320              i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1321                                1+i)) {
1322                 (*method)->agent[i] = agent_priv;
1323         }
1324         return 0;
1325
1326 error3:
1327         /* Remove any methods for this mad agent */
1328         remove_methods_mad_agent(*method, agent_priv);
1329         /* Now, check to see if there are any methods in use */
1330         if (!check_method_table(*method)) {
1331                 /* If not, release management method table */
1332                 kfree(*method);
1333                 *method = NULL;
1334         }
1335         ret = -EINVAL;
1336         goto error1;
1337 error2:
1338         kfree(*class);
1339         *class = NULL;
1340 error1:
1341         return ret;
1342 }
1343
1344 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1345                            struct ib_mad_agent_private *agent_priv)
1346 {
1347         struct ib_mad_port_private *port_priv;
1348         struct ib_mad_mgmt_vendor_class_table **vendor_table;
1349         struct ib_mad_mgmt_vendor_class_table *vendor = NULL;
1350         struct ib_mad_mgmt_vendor_class *vendor_class = NULL;
1351         struct ib_mad_mgmt_method_table **method;
1352         int i, ret = -ENOMEM;
1353         u8 vclass;
1354
1355         /* "New" vendor (with OUI) class */
1356         vclass = vendor_class_index(mad_reg_req->mgmt_class);
1357         port_priv = agent_priv->qp_info->port_priv;
1358         vendor_table = &port_priv->version[
1359                                 mad_reg_req->mgmt_class_version].vendor;
1360         if (!*vendor_table) {
1361                 /* Allocate mgmt vendor class table for "new" class version */
1362                 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC);
1363                 if (!vendor) {
1364                         printk(KERN_ERR PFX "No memory for "
1365                                "ib_mad_mgmt_vendor_class_table\n");
1366                         goto error1;
1367                 }
1368
1369                 *vendor_table = vendor;
1370         }
1371         if (!(*vendor_table)->vendor_class[vclass]) {
1372                 /* Allocate table for this management vendor class */
1373                 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC);
1374                 if (!vendor_class) {
1375                         printk(KERN_ERR PFX "No memory for "
1376                                "ib_mad_mgmt_vendor_class\n");
1377                         goto error2;
1378                 }
1379
1380                 (*vendor_table)->vendor_class[vclass] = vendor_class;
1381         }
1382         for (i = 0; i < MAX_MGMT_OUI; i++) {
1383                 /* Is there matching OUI for this vendor class ? */
1384                 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i],
1385                             mad_reg_req->oui, 3)) {
1386                         method = &(*vendor_table)->vendor_class[
1387                                                 vclass]->method_table[i];
1388                         BUG_ON(!*method);
1389                         goto check_in_use;
1390                 }
1391         }
1392         for (i = 0; i < MAX_MGMT_OUI; i++) {
1393                 /* OUI slot available ? */
1394                 if (!is_vendor_oui((*vendor_table)->vendor_class[
1395                                 vclass]->oui[i])) {
1396                         method = &(*vendor_table)->vendor_class[
1397                                 vclass]->method_table[i];
1398                         BUG_ON(*method);
1399                         /* Allocate method table for this OUI */
1400                         if ((ret = allocate_method_table(method)))
1401                                 goto error3;
1402                         memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
1403                                mad_reg_req->oui, 3);
1404                         goto check_in_use;
1405                 }
1406         }
1407         printk(KERN_ERR PFX "All OUI slots in use\n");
1408         goto error3;
1409
1410 check_in_use:
1411         /* Now, make sure methods are not already in use */
1412         if (method_in_use(method, mad_reg_req))
1413                 goto error4;
1414
1415         /* Finally, add in methods being registered */
1416         for (i = find_first_bit(mad_reg_req->method_mask,
1417                                 IB_MGMT_MAX_METHODS);
1418              i < IB_MGMT_MAX_METHODS;
1419              i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1420                                1+i)) {
1421                 (*method)->agent[i] = agent_priv;
1422         }
1423         return 0;
1424
1425 error4:
1426         /* Remove any methods for this mad agent */
1427         remove_methods_mad_agent(*method, agent_priv);
1428         /* Now, check to see if there are any methods in use */
1429         if (!check_method_table(*method)) {
1430                 /* If not, release management method table */
1431                 kfree(*method);
1432                 *method = NULL;
1433         }
1434         ret = -EINVAL;
1435 error3:
1436         if (vendor_class) {
1437                 (*vendor_table)->vendor_class[vclass] = NULL;
1438                 kfree(vendor_class);
1439         }
1440 error2:
1441         if (vendor) {
1442                 *vendor_table = NULL;
1443                 kfree(vendor);
1444         }
1445 error1:
1446         return ret;
1447 }
1448
1449 static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv)
1450 {
1451         struct ib_mad_port_private *port_priv;
1452         struct ib_mad_mgmt_class_table *class;
1453         struct ib_mad_mgmt_method_table *method;
1454         struct ib_mad_mgmt_vendor_class_table *vendor;
1455         struct ib_mad_mgmt_vendor_class *vendor_class;
1456         int index;
1457         u8 mgmt_class;
1458
1459         /*
1460          * Was MAD registration request supplied
1461          * with original registration ?
1462          */
1463         if (!agent_priv->reg_req) {
1464                 goto out;
1465         }
1466
1467         port_priv = agent_priv->qp_info->port_priv;
1468         mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class);
1469         class = port_priv->version[
1470                         agent_priv->reg_req->mgmt_class_version].class;
1471         if (!class)
1472                 goto vendor_check;
1473
1474         method = class->method_table[mgmt_class];
1475         if (method) {
1476                 /* Remove any methods for this mad agent */
1477                 remove_methods_mad_agent(method, agent_priv);
1478                 /* Now, check to see if there are any methods still in use */
1479                 if (!check_method_table(method)) {
1480                         /* If not, release management method table */
1481                          kfree(method);
1482                          class->method_table[mgmt_class] = NULL;
1483                          /* Any management classes left ? */
1484                         if (!check_class_table(class)) {
1485                                 /* If not, release management class table */
1486                                 kfree(class);
1487                                 port_priv->version[
1488                                         agent_priv->reg_req->
1489                                         mgmt_class_version].class = NULL;
1490                         }
1491                 }
1492         }
1493
1494 vendor_check:
1495         if (!is_vendor_class(mgmt_class))
1496                 goto out;
1497
1498         /* normalize mgmt_class to vendor range 2 */
1499         mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class);
1500         vendor = port_priv->version[
1501                         agent_priv->reg_req->mgmt_class_version].vendor;
1502
1503         if (!vendor)
1504                 goto out;
1505
1506         vendor_class = vendor->vendor_class[mgmt_class];
1507         if (vendor_class) {
1508                 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui);
1509                 if (index < 0)
1510                         goto out;
1511                 method = vendor_class->method_table[index];
1512                 if (method) {
1513                         /* Remove any methods for this mad agent */
1514                         remove_methods_mad_agent(method, agent_priv);
1515                         /*
1516                          * Now, check to see if there are
1517                          * any methods still in use
1518                          */
1519                         if (!check_method_table(method)) {
1520                                 /* If not, release management method table */
1521                                 kfree(method);
1522                                 vendor_class->method_table[index] = NULL;
1523                                 memset(vendor_class->oui[index], 0, 3);
1524                                 /* Any OUIs left ? */
1525                                 if (!check_vendor_class(vendor_class)) {
1526                                         /* If not, release vendor class table */
1527                                         kfree(vendor_class);
1528                                         vendor->vendor_class[mgmt_class] = NULL;
1529                                         /* Any other vendor classes left ? */
1530                                         if (!check_vendor_table(vendor)) {
1531                                                 kfree(vendor);
1532                                                 port_priv->version[
1533                                                         agent_priv->reg_req->
1534                                                         mgmt_class_version].
1535                                                         vendor = NULL;
1536                                         }
1537                                 }
1538                         }
1539                 }
1540         }
1541
1542 out:
1543         return;
1544 }
1545
1546 static struct ib_mad_agent_private *
1547 find_mad_agent(struct ib_mad_port_private *port_priv,
1548                struct ib_mad *mad)
1549 {
1550         struct ib_mad_agent_private *mad_agent = NULL;
1551         unsigned long flags;
1552
1553         spin_lock_irqsave(&port_priv->reg_lock, flags);
1554         if (response_mad(mad)) {
1555                 u32 hi_tid;
1556                 struct ib_mad_agent_private *entry;
1557
1558                 /*
1559                  * Routing is based on high 32 bits of transaction ID
1560                  * of MAD.
1561                  */
1562                 hi_tid = be64_to_cpu(mad->mad_hdr.tid) >> 32;
1563                 list_for_each_entry(entry, &port_priv->agent_list, agent_list) {
1564                         if (entry->agent.hi_tid == hi_tid) {
1565                                 mad_agent = entry;
1566                                 break;
1567                         }
1568                 }
1569         } else {
1570                 struct ib_mad_mgmt_class_table *class;
1571                 struct ib_mad_mgmt_method_table *method;
1572                 struct ib_mad_mgmt_vendor_class_table *vendor;
1573                 struct ib_mad_mgmt_vendor_class *vendor_class;
1574                 struct ib_vendor_mad *vendor_mad;
1575                 int index;
1576
1577                 /*
1578                  * Routing is based on version, class, and method
1579                  * For "newer" vendor MADs, also based on OUI
1580                  */
1581                 if (mad->mad_hdr.class_version >= MAX_MGMT_VERSION)
1582                         goto out;
1583                 if (!is_vendor_class(mad->mad_hdr.mgmt_class)) {
1584                         class = port_priv->version[
1585                                         mad->mad_hdr.class_version].class;
1586                         if (!class)
1587                                 goto out;
1588                         method = class->method_table[convert_mgmt_class(
1589                                                         mad->mad_hdr.mgmt_class)];
1590                         if (method)
1591                                 mad_agent = method->agent[mad->mad_hdr.method &
1592                                                           ~IB_MGMT_METHOD_RESP];
1593                 } else {
1594                         vendor = port_priv->version[
1595                                         mad->mad_hdr.class_version].vendor;
1596                         if (!vendor)
1597                                 goto out;
1598                         vendor_class = vendor->vendor_class[vendor_class_index(
1599                                                 mad->mad_hdr.mgmt_class)];
1600                         if (!vendor_class)
1601                                 goto out;
1602                         /* Find matching OUI */
1603                         vendor_mad = (struct ib_vendor_mad *)mad;
1604                         index = find_vendor_oui(vendor_class, vendor_mad->oui);
1605                         if (index == -1)
1606                                 goto out;
1607                         method = vendor_class->method_table[index];
1608                         if (method) {
1609                                 mad_agent = method->agent[mad->mad_hdr.method &
1610                                                           ~IB_MGMT_METHOD_RESP];
1611                         }
1612                 }
1613         }
1614
1615         if (mad_agent) {
1616                 if (mad_agent->agent.recv_handler)
1617                         atomic_inc(&mad_agent->refcount);
1618                 else {
1619                         printk(KERN_NOTICE PFX "No receive handler for client "
1620                                "%p on port %d\n",
1621                                &mad_agent->agent, port_priv->port_num);
1622                         mad_agent = NULL;
1623                 }
1624         }
1625 out:
1626         spin_unlock_irqrestore(&port_priv->reg_lock, flags);
1627
1628         return mad_agent;
1629 }
1630
1631 static int validate_mad(struct ib_mad *mad, u32 qp_num)
1632 {
1633         int valid = 0;
1634
1635         /* Make sure MAD base version is understood */
1636         if (mad->mad_hdr.base_version != IB_MGMT_BASE_VERSION) {
1637                 printk(KERN_ERR PFX "MAD received with unsupported base "
1638                        "version %d\n", mad->mad_hdr.base_version);
1639                 goto out;
1640         }
1641
1642         /* Filter SMI packets sent to other than QP0 */
1643         if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
1644             (mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
1645                 if (qp_num == 0)
1646                         valid = 1;
1647         } else {
1648                 /* Filter GSI packets sent to QP0 */
1649                 if (qp_num != 0)
1650                         valid = 1;
1651         }
1652
1653 out:
1654         return valid;
1655 }
1656
1657 static int is_data_mad(struct ib_mad_agent_private *mad_agent_priv,
1658                        struct ib_mad_hdr *mad_hdr)
1659 {
1660         struct ib_rmpp_mad *rmpp_mad;
1661
1662         rmpp_mad = (struct ib_rmpp_mad *)mad_hdr;
1663         return !mad_agent_priv->agent.rmpp_version ||
1664                 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
1665                                     IB_MGMT_RMPP_FLAG_ACTIVE) ||
1666                 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA);
1667 }
1668
1669 static inline int rcv_has_same_class(struct ib_mad_send_wr_private *wr,
1670                                      struct ib_mad_recv_wc *rwc)
1671 {
1672         return ((struct ib_mad *)(wr->send_buf.mad))->mad_hdr.mgmt_class ==
1673                 rwc->recv_buf.mad->mad_hdr.mgmt_class;
1674 }
1675
1676 static inline int rcv_has_same_gid(struct ib_mad_agent_private *mad_agent_priv,
1677                                    struct ib_mad_send_wr_private *wr,
1678                                    struct ib_mad_recv_wc *rwc )
1679 {
1680         struct ib_ah_attr attr;
1681         u8 send_resp, rcv_resp;
1682         union ib_gid sgid;
1683         struct ib_device *device = mad_agent_priv->agent.device;
1684         u8 port_num = mad_agent_priv->agent.port_num;
1685         u8 lmc;
1686
1687         send_resp = ((struct ib_mad *)(wr->send_buf.mad))->
1688                      mad_hdr.method & IB_MGMT_METHOD_RESP;
1689         rcv_resp = rwc->recv_buf.mad->mad_hdr.method & IB_MGMT_METHOD_RESP;
1690
1691         if (send_resp == rcv_resp)
1692                 /* both requests, or both responses. GIDs different */
1693                 return 0;
1694
1695         if (ib_query_ah(wr->send_buf.ah, &attr))
1696                 /* Assume not equal, to avoid false positives. */
1697                 return 0;
1698
1699         if (!!(attr.ah_flags & IB_AH_GRH) !=
1700             !!(rwc->wc->wc_flags & IB_WC_GRH))
1701                 /* one has GID, other does not.  Assume different */
1702                 return 0;
1703
1704         if (!send_resp && rcv_resp) {
1705                 /* is request/response. */
1706                 if (!(attr.ah_flags & IB_AH_GRH)) {
1707                         if (ib_get_cached_lmc(device, port_num, &lmc))
1708                                 return 0;
1709                         return (!lmc || !((attr.src_path_bits ^
1710                                            rwc->wc->dlid_path_bits) &
1711                                           ((1 << lmc) - 1)));
1712                 } else {
1713                         if (ib_get_cached_gid(device, port_num,
1714                                               attr.grh.sgid_index, &sgid))
1715                                 return 0;
1716                         return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw,
1717                                        16);
1718                 }
1719         }
1720
1721         if (!(attr.ah_flags & IB_AH_GRH))
1722                 return attr.dlid == rwc->wc->slid;
1723         else
1724                 return !memcmp(attr.grh.dgid.raw, rwc->recv_buf.grh->sgid.raw,
1725                                16);
1726 }
1727
1728 static inline int is_direct(u8 class)
1729 {
1730         return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE);
1731 }
1732
1733 struct ib_mad_send_wr_private*
1734 ib_find_send_mad(struct ib_mad_agent_private *mad_agent_priv,
1735                  struct ib_mad_recv_wc *wc)
1736 {
1737         struct ib_mad_send_wr_private *wr;
1738         struct ib_mad *mad;
1739
1740         mad = (struct ib_mad *)wc->recv_buf.mad;
1741
1742         list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) {
1743                 if ((wr->tid == mad->mad_hdr.tid) &&
1744                     rcv_has_same_class(wr, wc) &&
1745                     /*
1746                      * Don't check GID for direct routed MADs.
1747                      * These might have permissive LIDs.
1748                      */
1749                     (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) ||
1750                      rcv_has_same_gid(mad_agent_priv, wr, wc)))
1751                         return wr;
1752         }
1753
1754         /*
1755          * It's possible to receive the response before we've
1756          * been notified that the send has completed
1757          */
1758         list_for_each_entry(wr, &mad_agent_priv->send_list, agent_list) {
1759                 if (is_data_mad(mad_agent_priv, wr->send_buf.mad) &&
1760                     wr->tid == mad->mad_hdr.tid &&
1761                     wr->timeout &&
1762                     rcv_has_same_class(wr, wc) &&
1763                     /*
1764                      * Don't check GID for direct routed MADs.
1765                      * These might have permissive LIDs.
1766                      */
1767                     (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) ||
1768                      rcv_has_same_gid(mad_agent_priv, wr, wc)))
1769                         /* Verify request has not been canceled */
1770                         return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1771         }
1772         return NULL;
1773 }
1774
1775 void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr)
1776 {
1777         mad_send_wr->timeout = 0;
1778         if (mad_send_wr->refcount == 1)
1779                 list_move_tail(&mad_send_wr->agent_list,
1780                               &mad_send_wr->mad_agent_priv->done_list);
1781 }
1782
1783 static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
1784                                  struct ib_mad_recv_wc *mad_recv_wc)
1785 {
1786         struct ib_mad_send_wr_private *mad_send_wr;
1787         struct ib_mad_send_wc mad_send_wc;
1788         unsigned long flags;
1789
1790         INIT_LIST_HEAD(&mad_recv_wc->rmpp_list);
1791         list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list);
1792         if (mad_agent_priv->agent.rmpp_version) {
1793                 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv,
1794                                                       mad_recv_wc);
1795                 if (!mad_recv_wc) {
1796                         deref_mad_agent(mad_agent_priv);
1797                         return;
1798                 }
1799         }
1800
1801         /* Complete corresponding request */
1802         if (response_mad(mad_recv_wc->recv_buf.mad)) {
1803                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1804                 mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc);
1805                 if (!mad_send_wr) {
1806                         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1807                         ib_free_recv_mad(mad_recv_wc);
1808                         deref_mad_agent(mad_agent_priv);
1809                         return;
1810                 }
1811                 ib_mark_mad_done(mad_send_wr);
1812                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1813
1814                 /* Defined behavior is to complete response before request */
1815                 mad_recv_wc->wc->wr_id = (unsigned long) &mad_send_wr->send_buf;
1816                 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1817                                                    mad_recv_wc);
1818                 atomic_dec(&mad_agent_priv->refcount);
1819
1820                 mad_send_wc.status = IB_WC_SUCCESS;
1821                 mad_send_wc.vendor_err = 0;
1822                 mad_send_wc.send_buf = &mad_send_wr->send_buf;
1823                 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
1824         } else {
1825                 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1826                                                    mad_recv_wc);
1827                 deref_mad_agent(mad_agent_priv);
1828         }
1829 }
1830
1831 static void ib_mad_recv_done_handler(struct ib_mad_port_private *port_priv,
1832                                      struct ib_wc *wc)
1833 {
1834         struct ib_mad_qp_info *qp_info;
1835         struct ib_mad_private_header *mad_priv_hdr;
1836         struct ib_mad_private *recv, *response;
1837         struct ib_mad_list_head *mad_list;
1838         struct ib_mad_agent_private *mad_agent;
1839
1840         response = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
1841         if (!response)
1842                 printk(KERN_ERR PFX "ib_mad_recv_done_handler no memory "
1843                        "for response buffer\n");
1844
1845         mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
1846         qp_info = mad_list->mad_queue->qp_info;
1847         dequeue_mad(mad_list);
1848
1849         mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header,
1850                                     mad_list);
1851         recv = container_of(mad_priv_hdr, struct ib_mad_private, header);
1852         dma_unmap_single(port_priv->device->dma_device,
1853                          pci_unmap_addr(&recv->header, mapping),
1854                          sizeof(struct ib_mad_private) -
1855                          sizeof(struct ib_mad_private_header),
1856                          DMA_FROM_DEVICE);
1857
1858         /* Setup MAD receive work completion from "normal" work completion */
1859         recv->header.wc = *wc;
1860         recv->header.recv_wc.wc = &recv->header.wc;
1861         recv->header.recv_wc.mad_len = sizeof(struct ib_mad);
1862         recv->header.recv_wc.recv_buf.mad = &recv->mad.mad;
1863         recv->header.recv_wc.recv_buf.grh = &recv->grh;
1864
1865         if (atomic_read(&qp_info->snoop_count))
1866                 snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS);
1867
1868         /* Validate MAD */
1869         if (!validate_mad(&recv->mad.mad, qp_info->qp->qp_num))
1870                 goto out;
1871
1872         if (recv->mad.mad.mad_hdr.mgmt_class ==
1873             IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1874                 if (!smi_handle_dr_smp_recv(&recv->mad.smp,
1875                                             port_priv->device->node_type,
1876                                             port_priv->port_num,
1877                                             port_priv->device->phys_port_cnt))
1878                         goto out;
1879                 if (!smi_check_forward_dr_smp(&recv->mad.smp))
1880                         goto local;
1881                 if (!smi_handle_dr_smp_send(&recv->mad.smp,
1882                                             port_priv->device->node_type,
1883                                             port_priv->port_num))
1884                         goto out;
1885                 if (!smi_check_local_smp(&recv->mad.smp, port_priv->device))
1886                         goto out;
1887         }
1888
1889 local:
1890         /* Give driver "right of first refusal" on incoming MAD */
1891         if (port_priv->device->process_mad) {
1892                 int ret;
1893
1894                 if (!response) {
1895                         printk(KERN_ERR PFX "No memory for response MAD\n");
1896                         /*
1897                          * Is it better to assume that
1898                          * it wouldn't be processed ?
1899                          */
1900                         goto out;
1901                 }
1902
1903                 ret = port_priv->device->process_mad(port_priv->device, 0,
1904                                                      port_priv->port_num,
1905                                                      wc, &recv->grh,
1906                                                      &recv->mad.mad,
1907                                                      &response->mad.mad);
1908                 if (ret & IB_MAD_RESULT_SUCCESS) {
1909                         if (ret & IB_MAD_RESULT_CONSUMED)
1910                                 goto out;
1911                         if (ret & IB_MAD_RESULT_REPLY) {
1912                                 agent_send_response(&response->mad.mad,
1913                                                     &recv->grh, wc,
1914                                                     port_priv->device,
1915                                                     port_priv->port_num,
1916                                                     qp_info->qp->qp_num);
1917                                 goto out;
1918                         }
1919                 }
1920         }
1921
1922         mad_agent = find_mad_agent(port_priv, &recv->mad.mad);
1923         if (mad_agent) {
1924                 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
1925                 /*
1926                  * recv is freed up in error cases in ib_mad_complete_recv
1927                  * or via recv_handler in ib_mad_complete_recv()
1928                  */
1929                 recv = NULL;
1930         }
1931
1932 out:
1933         /* Post another receive request for this QP */
1934         if (response) {
1935                 ib_mad_post_receive_mads(qp_info, response);
1936                 if (recv)
1937                         kmem_cache_free(ib_mad_cache, recv);
1938         } else
1939                 ib_mad_post_receive_mads(qp_info, recv);
1940 }
1941
1942 static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
1943 {
1944         struct ib_mad_send_wr_private *mad_send_wr;
1945         unsigned long delay;
1946
1947         if (list_empty(&mad_agent_priv->wait_list)) {
1948                 cancel_delayed_work(&mad_agent_priv->timed_work);
1949         } else {
1950                 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
1951                                          struct ib_mad_send_wr_private,
1952                                          agent_list);
1953
1954                 if (time_after(mad_agent_priv->timeout,
1955                                mad_send_wr->timeout)) {
1956                         mad_agent_priv->timeout = mad_send_wr->timeout;
1957                         cancel_delayed_work(&mad_agent_priv->timed_work);
1958                         delay = mad_send_wr->timeout - jiffies;
1959                         if ((long)delay <= 0)
1960                                 delay = 1;
1961                         queue_delayed_work(mad_agent_priv->qp_info->
1962                                            port_priv->wq,
1963                                            &mad_agent_priv->timed_work, delay);
1964                 }
1965         }
1966 }
1967
1968 static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
1969 {
1970         struct ib_mad_agent_private *mad_agent_priv;
1971         struct ib_mad_send_wr_private *temp_mad_send_wr;
1972         struct list_head *list_item;
1973         unsigned long delay;
1974
1975         mad_agent_priv = mad_send_wr->mad_agent_priv;
1976         list_del(&mad_send_wr->agent_list);
1977
1978         delay = mad_send_wr->timeout;
1979         mad_send_wr->timeout += jiffies;
1980
1981         if (delay) {
1982                 list_for_each_prev(list_item, &mad_agent_priv->wait_list) {
1983                         temp_mad_send_wr = list_entry(list_item,
1984                                                 struct ib_mad_send_wr_private,
1985                                                 agent_list);
1986                         if (time_after(mad_send_wr->timeout,
1987                                        temp_mad_send_wr->timeout))
1988                                 break;
1989                 }
1990         }
1991         else
1992                 list_item = &mad_agent_priv->wait_list;
1993         list_add(&mad_send_wr->agent_list, list_item);
1994
1995         /* Reschedule a work item if we have a shorter timeout */
1996         if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list) {
1997                 cancel_delayed_work(&mad_agent_priv->timed_work);
1998                 queue_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
1999                                    &mad_agent_priv->timed_work, delay);
2000         }
2001 }
2002
2003 void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr,
2004                           int timeout_ms)
2005 {
2006         mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2007         wait_for_response(mad_send_wr);
2008 }
2009
2010 /*
2011  * Process a send work completion
2012  */
2013 void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
2014                              struct ib_mad_send_wc *mad_send_wc)
2015 {
2016         struct ib_mad_agent_private     *mad_agent_priv;
2017         unsigned long                   flags;
2018         int                             ret;
2019
2020         mad_agent_priv = mad_send_wr->mad_agent_priv;
2021         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2022         if (mad_agent_priv->agent.rmpp_version) {
2023                 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc);
2024                 if (ret == IB_RMPP_RESULT_CONSUMED)
2025                         goto done;
2026         } else
2027                 ret = IB_RMPP_RESULT_UNHANDLED;
2028
2029         if (mad_send_wc->status != IB_WC_SUCCESS &&
2030             mad_send_wr->status == IB_WC_SUCCESS) {
2031                 mad_send_wr->status = mad_send_wc->status;
2032                 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2033         }
2034
2035         if (--mad_send_wr->refcount > 0) {
2036                 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout &&
2037                     mad_send_wr->status == IB_WC_SUCCESS) {
2038                         wait_for_response(mad_send_wr);
2039                 }
2040                 goto done;
2041         }
2042
2043         /* Remove send from MAD agent and notify client of completion */
2044         list_del(&mad_send_wr->agent_list);
2045         adjust_timeout(mad_agent_priv);
2046         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2047
2048         if (mad_send_wr->status != IB_WC_SUCCESS )
2049                 mad_send_wc->status = mad_send_wr->status;
2050         if (ret == IB_RMPP_RESULT_INTERNAL)
2051                 ib_rmpp_send_handler(mad_send_wc);
2052         else
2053                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2054                                                    mad_send_wc);
2055
2056         /* Release reference on agent taken when sending */
2057         deref_mad_agent(mad_agent_priv);
2058         return;
2059 done:
2060         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2061 }
2062
2063 static void ib_mad_send_done_handler(struct ib_mad_port_private *port_priv,
2064                                      struct ib_wc *wc)
2065 {
2066         struct ib_mad_send_wr_private   *mad_send_wr, *queued_send_wr;
2067         struct ib_mad_list_head         *mad_list;
2068         struct ib_mad_qp_info           *qp_info;
2069         struct ib_mad_queue             *send_queue;
2070         struct ib_send_wr               *bad_send_wr;
2071         struct ib_mad_send_wc           mad_send_wc;
2072         unsigned long flags;
2073         int ret;
2074
2075         mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2076         mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2077                                    mad_list);
2078         send_queue = mad_list->mad_queue;
2079         qp_info = send_queue->qp_info;
2080
2081 retry:
2082         dma_unmap_single(mad_send_wr->send_buf.mad_agent->device->dma_device,
2083                          pci_unmap_addr(mad_send_wr, header_mapping),
2084                          mad_send_wr->sg_list[0].length, DMA_TO_DEVICE);
2085         dma_unmap_single(mad_send_wr->send_buf.mad_agent->device->dma_device,
2086                          pci_unmap_addr(mad_send_wr, payload_mapping),
2087                          mad_send_wr->sg_list[1].length, DMA_TO_DEVICE);
2088         queued_send_wr = NULL;
2089         spin_lock_irqsave(&send_queue->lock, flags);
2090         list_del(&mad_list->list);
2091
2092         /* Move queued send to the send queue */
2093         if (send_queue->count-- > send_queue->max_active) {
2094                 mad_list = container_of(qp_info->overflow_list.next,
2095                                         struct ib_mad_list_head, list);
2096                 queued_send_wr = container_of(mad_list,
2097                                         struct ib_mad_send_wr_private,
2098                                         mad_list);
2099                 list_move_tail(&mad_list->list, &send_queue->list);
2100         }
2101         spin_unlock_irqrestore(&send_queue->lock, flags);
2102
2103         mad_send_wc.send_buf = &mad_send_wr->send_buf;
2104         mad_send_wc.status = wc->status;
2105         mad_send_wc.vendor_err = wc->vendor_err;
2106         if (atomic_read(&qp_info->snoop_count))
2107                 snoop_send(qp_info, &mad_send_wr->send_buf, &mad_send_wc,
2108                            IB_MAD_SNOOP_SEND_COMPLETIONS);
2109         ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
2110
2111         if (queued_send_wr) {
2112                 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr,
2113                                    &bad_send_wr);
2114                 if (ret) {
2115                         printk(KERN_ERR PFX "ib_post_send failed: %d\n", ret);
2116                         mad_send_wr = queued_send_wr;
2117                         wc->status = IB_WC_LOC_QP_OP_ERR;
2118                         goto retry;
2119                 }
2120         }
2121 }
2122
2123 static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info)
2124 {
2125         struct ib_mad_send_wr_private *mad_send_wr;
2126         struct ib_mad_list_head *mad_list;
2127         unsigned long flags;
2128
2129         spin_lock_irqsave(&qp_info->send_queue.lock, flags);
2130         list_for_each_entry(mad_list, &qp_info->send_queue.list, list) {
2131                 mad_send_wr = container_of(mad_list,
2132                                            struct ib_mad_send_wr_private,
2133                                            mad_list);
2134                 mad_send_wr->retry = 1;
2135         }
2136         spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
2137 }
2138
2139 static void mad_error_handler(struct ib_mad_port_private *port_priv,
2140                               struct ib_wc *wc)
2141 {
2142         struct ib_mad_list_head *mad_list;
2143         struct ib_mad_qp_info *qp_info;
2144         struct ib_mad_send_wr_private *mad_send_wr;
2145         int ret;
2146
2147         /* Determine if failure was a send or receive */
2148         mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2149         qp_info = mad_list->mad_queue->qp_info;
2150         if (mad_list->mad_queue == &qp_info->recv_queue)
2151                 /*
2152                  * Receive errors indicate that the QP has entered the error
2153                  * state - error handling/shutdown code will cleanup
2154                  */
2155                 return;
2156
2157         /*
2158          * Send errors will transition the QP to SQE - move
2159          * QP to RTS and repost flushed work requests
2160          */
2161         mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2162                                    mad_list);
2163         if (wc->status == IB_WC_WR_FLUSH_ERR) {
2164                 if (mad_send_wr->retry) {
2165                         /* Repost send */
2166                         struct ib_send_wr *bad_send_wr;
2167
2168                         mad_send_wr->retry = 0;
2169                         ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr,
2170                                         &bad_send_wr);
2171                         if (ret)
2172                                 ib_mad_send_done_handler(port_priv, wc);
2173                 } else
2174                         ib_mad_send_done_handler(port_priv, wc);
2175         } else {
2176                 struct ib_qp_attr *attr;
2177
2178                 /* Transition QP to RTS and fail offending send */
2179                 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2180                 if (attr) {
2181                         attr->qp_state = IB_QPS_RTS;
2182                         attr->cur_qp_state = IB_QPS_SQE;
2183                         ret = ib_modify_qp(qp_info->qp, attr,
2184                                            IB_QP_STATE | IB_QP_CUR_STATE);
2185                         kfree(attr);
2186                         if (ret)
2187                                 printk(KERN_ERR PFX "mad_error_handler - "
2188                                        "ib_modify_qp to RTS : %d\n", ret);
2189                         else
2190                                 mark_sends_for_retry(qp_info);
2191                 }
2192                 ib_mad_send_done_handler(port_priv, wc);
2193         }
2194 }
2195
2196 /*
2197  * IB MAD completion callback
2198  */
2199 static void ib_mad_completion_handler(void *data)
2200 {
2201         struct ib_mad_port_private *port_priv;
2202         struct ib_wc wc;
2203
2204         port_priv = (struct ib_mad_port_private *)data;
2205         ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2206
2207         while (ib_poll_cq(port_priv->cq, 1, &wc) == 1) {
2208                 if (wc.status == IB_WC_SUCCESS) {
2209                         switch (wc.opcode) {
2210                         case IB_WC_SEND:
2211                                 ib_mad_send_done_handler(port_priv, &wc);
2212                                 break;
2213                         case IB_WC_RECV:
2214                                 ib_mad_recv_done_handler(port_priv, &wc);
2215                                 break;
2216                         default:
2217                                 BUG_ON(1);
2218                                 break;
2219                         }
2220                 } else
2221                         mad_error_handler(port_priv, &wc);
2222         }
2223 }
2224
2225 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
2226 {
2227         unsigned long flags;
2228         struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr;
2229         struct ib_mad_send_wc mad_send_wc;
2230         struct list_head cancel_list;
2231
2232         INIT_LIST_HEAD(&cancel_list);
2233
2234         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2235         list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2236                                  &mad_agent_priv->send_list, agent_list) {
2237                 if (mad_send_wr->status == IB_WC_SUCCESS) {
2238                         mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2239                         mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2240                 }
2241         }
2242
2243         /* Empty wait list to prevent receives from finding a request */
2244         list_splice_init(&mad_agent_priv->wait_list, &cancel_list);
2245         /* Empty local completion list as well */
2246         list_splice_init(&mad_agent_priv->local_list, &cancel_list);
2247         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2248
2249         /* Report all cancelled requests */
2250         mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
2251         mad_send_wc.vendor_err = 0;
2252
2253         list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2254                                  &cancel_list, agent_list) {
2255                 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2256                 list_del(&mad_send_wr->agent_list);
2257                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2258                                                    &mad_send_wc);
2259                 atomic_dec(&mad_agent_priv->refcount);
2260         }
2261 }
2262
2263 static struct ib_mad_send_wr_private*
2264 find_send_wr(struct ib_mad_agent_private *mad_agent_priv,
2265              struct ib_mad_send_buf *send_buf)
2266 {
2267         struct ib_mad_send_wr_private *mad_send_wr;
2268
2269         list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
2270                             agent_list) {
2271                 if (&mad_send_wr->send_buf == send_buf)
2272                         return mad_send_wr;
2273         }
2274
2275         list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
2276                             agent_list) {
2277                 if (is_data_mad(mad_agent_priv, mad_send_wr->send_buf.mad) &&
2278                     &mad_send_wr->send_buf == send_buf)
2279                         return mad_send_wr;
2280         }
2281         return NULL;
2282 }
2283
2284 int ib_modify_mad(struct ib_mad_agent *mad_agent,
2285                   struct ib_mad_send_buf *send_buf, u32 timeout_ms)
2286 {
2287         struct ib_mad_agent_private *mad_agent_priv;
2288         struct ib_mad_send_wr_private *mad_send_wr;
2289         unsigned long flags;
2290         int active;
2291
2292         mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
2293                                       agent);
2294         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2295         mad_send_wr = find_send_wr(mad_agent_priv, send_buf);
2296         if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) {
2297                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2298                 return -EINVAL;
2299         }
2300
2301         active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1);
2302         if (!timeout_ms) {
2303                 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2304                 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2305         }
2306
2307         mad_send_wr->send_buf.timeout_ms = timeout_ms;
2308         if (active)
2309                 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2310         else
2311                 ib_reset_mad_timeout(mad_send_wr, timeout_ms);
2312
2313         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2314         return 0;
2315 }
2316 EXPORT_SYMBOL(ib_modify_mad);
2317
2318 void ib_cancel_mad(struct ib_mad_agent *mad_agent,
2319                    struct ib_mad_send_buf *send_buf)
2320 {
2321         ib_modify_mad(mad_agent, send_buf, 0);
2322 }
2323 EXPORT_SYMBOL(ib_cancel_mad);
2324
2325 static void local_completions(void *data)
2326 {
2327         struct ib_mad_agent_private *mad_agent_priv;
2328         struct ib_mad_local_private *local;
2329         struct ib_mad_agent_private *recv_mad_agent;
2330         unsigned long flags;
2331         int recv = 0;
2332         struct ib_wc wc;
2333         struct ib_mad_send_wc mad_send_wc;
2334
2335         mad_agent_priv = (struct ib_mad_agent_private *)data;
2336
2337         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2338         while (!list_empty(&mad_agent_priv->local_list)) {
2339                 local = list_entry(mad_agent_priv->local_list.next,
2340                                    struct ib_mad_local_private,
2341                                    completion_list);
2342                 list_del(&local->completion_list);
2343                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2344                 if (local->mad_priv) {
2345                         recv_mad_agent = local->recv_mad_agent;
2346                         if (!recv_mad_agent) {
2347                                 printk(KERN_ERR PFX "No receive MAD agent for local completion\n");
2348                                 goto local_send_completion;
2349                         }
2350
2351                         recv = 1;
2352                         /*
2353                          * Defined behavior is to complete response
2354                          * before request
2355                          */
2356                         build_smp_wc((unsigned long) local->mad_send_wr,
2357                                      be16_to_cpu(IB_LID_PERMISSIVE),
2358                                      0, recv_mad_agent->agent.port_num, &wc);
2359
2360                         local->mad_priv->header.recv_wc.wc = &wc;
2361                         local->mad_priv->header.recv_wc.mad_len =
2362                                                 sizeof(struct ib_mad);
2363                         INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list);
2364                         list_add(&local->mad_priv->header.recv_wc.recv_buf.list,
2365                                  &local->mad_priv->header.recv_wc.rmpp_list);
2366                         local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
2367                         local->mad_priv->header.recv_wc.recv_buf.mad =
2368                                                 &local->mad_priv->mad.mad;
2369                         if (atomic_read(&recv_mad_agent->qp_info->snoop_count))
2370                                 snoop_recv(recv_mad_agent->qp_info,
2371                                           &local->mad_priv->header.recv_wc,
2372                                            IB_MAD_SNOOP_RECVS);
2373                         recv_mad_agent->agent.recv_handler(
2374                                                 &recv_mad_agent->agent,
2375                                                 &local->mad_priv->header.recv_wc);
2376                         spin_lock_irqsave(&recv_mad_agent->lock, flags);
2377                         atomic_dec(&recv_mad_agent->refcount);
2378                         spin_unlock_irqrestore(&recv_mad_agent->lock, flags);
2379                 }
2380
2381 local_send_completion:
2382                 /* Complete send */
2383                 mad_send_wc.status = IB_WC_SUCCESS;
2384                 mad_send_wc.vendor_err = 0;
2385                 mad_send_wc.send_buf = &local->mad_send_wr->send_buf;
2386                 if (atomic_read(&mad_agent_priv->qp_info->snoop_count))
2387                         snoop_send(mad_agent_priv->qp_info,
2388                                    &local->mad_send_wr->send_buf,
2389                                    &mad_send_wc, IB_MAD_SNOOP_SEND_COMPLETIONS);
2390                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2391                                                    &mad_send_wc);
2392
2393                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2394                 atomic_dec(&mad_agent_priv->refcount);
2395                 if (!recv)
2396                         kmem_cache_free(ib_mad_cache, local->mad_priv);
2397                 kfree(local);
2398         }
2399         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2400 }
2401
2402 static int retry_send(struct ib_mad_send_wr_private *mad_send_wr)
2403 {
2404         int ret;
2405
2406         if (!mad_send_wr->retries--)
2407                 return -ETIMEDOUT;
2408
2409         mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
2410
2411         if (mad_send_wr->mad_agent_priv->agent.rmpp_version) {
2412                 ret = ib_retry_rmpp(mad_send_wr);
2413                 switch (ret) {
2414                 case IB_RMPP_RESULT_UNHANDLED:
2415                         ret = ib_send_mad(mad_send_wr);
2416                         break;
2417                 case IB_RMPP_RESULT_CONSUMED:
2418                         ret = 0;
2419                         break;
2420                 default:
2421                         ret = -ECOMM;
2422                         break;
2423                 }
2424         } else
2425                 ret = ib_send_mad(mad_send_wr);
2426
2427         if (!ret) {
2428                 mad_send_wr->refcount++;
2429                 list_add_tail(&mad_send_wr->agent_list,
2430                               &mad_send_wr->mad_agent_priv->send_list);
2431         }
2432         return ret;
2433 }
2434
2435 static void timeout_sends(void *data)
2436 {
2437         struct ib_mad_agent_private *mad_agent_priv;
2438         struct ib_mad_send_wr_private *mad_send_wr;
2439         struct ib_mad_send_wc mad_send_wc;
2440         unsigned long flags, delay;
2441
2442         mad_agent_priv = (struct ib_mad_agent_private *)data;
2443         mad_send_wc.vendor_err = 0;
2444
2445         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2446         while (!list_empty(&mad_agent_priv->wait_list)) {
2447                 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2448                                          struct ib_mad_send_wr_private,
2449                                          agent_list);
2450
2451                 if (time_after(mad_send_wr->timeout, jiffies)) {
2452                         delay = mad_send_wr->timeout - jiffies;
2453                         if ((long)delay <= 0)
2454                                 delay = 1;
2455                         queue_delayed_work(mad_agent_priv->qp_info->
2456                                            port_priv->wq,
2457                                            &mad_agent_priv->timed_work, delay);
2458                         break;
2459                 }
2460
2461                 list_del(&mad_send_wr->agent_list);
2462                 if (mad_send_wr->status == IB_WC_SUCCESS &&
2463                     !retry_send(mad_send_wr))
2464                         continue;
2465
2466                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2467
2468                 if (mad_send_wr->status == IB_WC_SUCCESS)
2469                         mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR;
2470                 else
2471                         mad_send_wc.status = mad_send_wr->status;
2472                 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2473                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2474                                                    &mad_send_wc);
2475
2476                 atomic_dec(&mad_agent_priv->refcount);
2477                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2478         }
2479         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2480 }
2481
2482 static void ib_mad_thread_completion_handler(struct ib_cq *cq, void *arg)
2483 {
2484         struct ib_mad_port_private *port_priv = cq->cq_context;
2485         unsigned long flags;
2486
2487         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2488         if (!list_empty(&port_priv->port_list))
2489                 queue_work(port_priv->wq, &port_priv->work);
2490         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2491 }
2492
2493 /*
2494  * Allocate receive MADs and post receive WRs for them
2495  */
2496 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
2497                                     struct ib_mad_private *mad)
2498 {
2499         unsigned long flags;
2500         int post, ret;
2501         struct ib_mad_private *mad_priv;
2502         struct ib_sge sg_list;
2503         struct ib_recv_wr recv_wr, *bad_recv_wr;
2504         struct ib_mad_queue *recv_queue = &qp_info->recv_queue;
2505
2506         /* Initialize common scatter list fields */
2507         sg_list.length = sizeof *mad_priv - sizeof mad_priv->header;
2508         sg_list.lkey = (*qp_info->port_priv->mr).lkey;
2509
2510         /* Initialize common receive WR fields */
2511         recv_wr.next = NULL;
2512         recv_wr.sg_list = &sg_list;
2513         recv_wr.num_sge = 1;
2514
2515         do {
2516                 /* Allocate and map receive buffer */
2517                 if (mad) {
2518                         mad_priv = mad;
2519                         mad = NULL;
2520                 } else {
2521                         mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
2522                         if (!mad_priv) {
2523                                 printk(KERN_ERR PFX "No memory for receive buffer\n");
2524                                 ret = -ENOMEM;
2525                                 break;
2526                         }
2527                 }
2528                 sg_list.addr = dma_map_single(qp_info->port_priv->
2529                                                 device->dma_device,
2530                                               &mad_priv->grh,
2531                                               sizeof *mad_priv -
2532                                                 sizeof mad_priv->header,
2533                                               DMA_FROM_DEVICE);
2534                 pci_unmap_addr_set(&mad_priv->header, mapping, sg_list.addr);
2535                 recv_wr.wr_id = (unsigned long)&mad_priv->header.mad_list;
2536                 mad_priv->header.mad_list.mad_queue = recv_queue;
2537
2538                 /* Post receive WR */
2539                 spin_lock_irqsave(&recv_queue->lock, flags);
2540                 post = (++recv_queue->count < recv_queue->max_active);
2541                 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list);
2542                 spin_unlock_irqrestore(&recv_queue->lock, flags);
2543                 ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr);
2544                 if (ret) {
2545                         spin_lock_irqsave(&recv_queue->lock, flags);
2546                         list_del(&mad_priv->header.mad_list.list);
2547                         recv_queue->count--;
2548                         spin_unlock_irqrestore(&recv_queue->lock, flags);
2549                         dma_unmap_single(qp_info->port_priv->device->dma_device,
2550                                          pci_unmap_addr(&mad_priv->header,
2551                                                         mapping),
2552                                          sizeof *mad_priv -
2553                                            sizeof mad_priv->header,
2554                                          DMA_FROM_DEVICE);
2555                         kmem_cache_free(ib_mad_cache, mad_priv);
2556                         printk(KERN_ERR PFX "ib_post_recv failed: %d\n", ret);
2557                         break;
2558                 }
2559         } while (post);
2560
2561         return ret;
2562 }
2563
2564 /*
2565  * Return all the posted receive MADs
2566  */
2567 static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info)
2568 {
2569         struct ib_mad_private_header *mad_priv_hdr;
2570         struct ib_mad_private *recv;
2571         struct ib_mad_list_head *mad_list;
2572
2573         while (!list_empty(&qp_info->recv_queue.list)) {
2574
2575                 mad_list = list_entry(qp_info->recv_queue.list.next,
2576                                       struct ib_mad_list_head, list);
2577                 mad_priv_hdr = container_of(mad_list,
2578                                             struct ib_mad_private_header,
2579                                             mad_list);
2580                 recv = container_of(mad_priv_hdr, struct ib_mad_private,
2581                                     header);
2582
2583                 /* Remove from posted receive MAD list */
2584                 list_del(&mad_list->list);
2585
2586                 dma_unmap_single(qp_info->port_priv->device->dma_device,
2587                                  pci_unmap_addr(&recv->header, mapping),
2588                                  sizeof(struct ib_mad_private) -
2589                                  sizeof(struct ib_mad_private_header),
2590                                  DMA_FROM_DEVICE);
2591                 kmem_cache_free(ib_mad_cache, recv);
2592         }
2593
2594         qp_info->recv_queue.count = 0;
2595 }
2596
2597 /*
2598  * Start the port
2599  */
2600 static int ib_mad_port_start(struct ib_mad_port_private *port_priv)
2601 {
2602         int ret, i;
2603         struct ib_qp_attr *attr;
2604         struct ib_qp *qp;
2605
2606         attr = kmalloc(sizeof *attr, GFP_KERNEL);
2607         if (!attr) {
2608                 printk(KERN_ERR PFX "Couldn't kmalloc ib_qp_attr\n");
2609                 return -ENOMEM;
2610         }
2611
2612         for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2613                 qp = port_priv->qp_info[i].qp;
2614                 /*
2615                  * PKey index for QP1 is irrelevant but
2616                  * one is needed for the Reset to Init transition
2617                  */
2618                 attr->qp_state = IB_QPS_INIT;
2619                 attr->pkey_index = 0;
2620                 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY;
2621                 ret = ib_modify_qp(qp, attr, IB_QP_STATE |
2622                                              IB_QP_PKEY_INDEX | IB_QP_QKEY);
2623                 if (ret) {
2624                         printk(KERN_ERR PFX "Couldn't change QP%d state to "
2625                                "INIT: %d\n", i, ret);
2626                         goto out;
2627                 }
2628
2629                 attr->qp_state = IB_QPS_RTR;
2630                 ret = ib_modify_qp(qp, attr, IB_QP_STATE);
2631                 if (ret) {
2632                         printk(KERN_ERR PFX "Couldn't change QP%d state to "
2633                                "RTR: %d\n", i, ret);
2634                         goto out;
2635                 }
2636
2637                 attr->qp_state = IB_QPS_RTS;
2638                 attr->sq_psn = IB_MAD_SEND_Q_PSN;
2639                 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN);
2640                 if (ret) {
2641                         printk(KERN_ERR PFX "Couldn't change QP%d state to "
2642                                "RTS: %d\n", i, ret);
2643                         goto out;
2644                 }
2645         }
2646
2647         ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2648         if (ret) {
2649                 printk(KERN_ERR PFX "Failed to request completion "
2650                        "notification: %d\n", ret);
2651                 goto out;
2652         }
2653
2654         for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2655                 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
2656                 if (ret) {
2657                         printk(KERN_ERR PFX "Couldn't post receive WRs\n");
2658                         goto out;
2659                 }
2660         }
2661 out:
2662         kfree(attr);
2663         return ret;
2664 }
2665
2666 static void qp_event_handler(struct ib_event *event, void *qp_context)
2667 {
2668         struct ib_mad_qp_info   *qp_info = qp_context;
2669
2670         /* It's worse than that! He's dead, Jim! */
2671         printk(KERN_ERR PFX "Fatal error (%d) on MAD QP (%d)\n",
2672                 event->event, qp_info->qp->qp_num);
2673 }
2674
2675 static void init_mad_queue(struct ib_mad_qp_info *qp_info,
2676                            struct ib_mad_queue *mad_queue)
2677 {
2678         mad_queue->qp_info = qp_info;
2679         mad_queue->count = 0;
2680         spin_lock_init(&mad_queue->lock);
2681         INIT_LIST_HEAD(&mad_queue->list);
2682 }
2683
2684 static void init_mad_qp(struct ib_mad_port_private *port_priv,
2685                         struct ib_mad_qp_info *qp_info)
2686 {
2687         qp_info->port_priv = port_priv;
2688         init_mad_queue(qp_info, &qp_info->send_queue);
2689         init_mad_queue(qp_info, &qp_info->recv_queue);
2690         INIT_LIST_HEAD(&qp_info->overflow_list);
2691         spin_lock_init(&qp_info->snoop_lock);
2692         qp_info->snoop_table = NULL;
2693         qp_info->snoop_table_size = 0;
2694         atomic_set(&qp_info->snoop_count, 0);
2695 }
2696
2697 static int create_mad_qp(struct ib_mad_qp_info *qp_info,
2698                          enum ib_qp_type qp_type)
2699 {
2700         struct ib_qp_init_attr  qp_init_attr;
2701         int ret;
2702
2703         memset(&qp_init_attr, 0, sizeof qp_init_attr);
2704         qp_init_attr.send_cq = qp_info->port_priv->cq;
2705         qp_init_attr.recv_cq = qp_info->port_priv->cq;
2706         qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
2707         qp_init_attr.cap.max_send_wr = IB_MAD_QP_SEND_SIZE;
2708         qp_init_attr.cap.max_recv_wr = IB_MAD_QP_RECV_SIZE;
2709         qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG;
2710         qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG;
2711         qp_init_attr.qp_type = qp_type;
2712         qp_init_attr.port_num = qp_info->port_priv->port_num;
2713         qp_init_attr.qp_context = qp_info;
2714         qp_init_attr.event_handler = qp_event_handler;
2715         qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr);
2716         if (IS_ERR(qp_info->qp)) {
2717                 printk(KERN_ERR PFX "Couldn't create ib_mad QP%d\n",
2718                        get_spl_qp_index(qp_type));
2719                 ret = PTR_ERR(qp_info->qp);
2720                 goto error;
2721         }
2722         /* Use minimum queue sizes unless the CQ is resized */
2723         qp_info->send_queue.max_active = IB_MAD_QP_SEND_SIZE;
2724         qp_info->recv_queue.max_active = IB_MAD_QP_RECV_SIZE;
2725         return 0;
2726
2727 error:
2728         return ret;
2729 }
2730
2731 static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
2732 {
2733         ib_destroy_qp(qp_info->qp);
2734         kfree(qp_info->snoop_table);
2735 }
2736
2737 /*
2738  * Open the port
2739  * Create the QP, PD, MR, and CQ if needed
2740  */
2741 static int ib_mad_port_open(struct ib_device *device,
2742                             int port_num)
2743 {
2744         int ret, cq_size;
2745         struct ib_mad_port_private *port_priv;
2746         unsigned long flags;
2747         char name[sizeof "ib_mad123"];
2748
2749         /* Create new device info */
2750         port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
2751         if (!port_priv) {
2752                 printk(KERN_ERR PFX "No memory for ib_mad_port_private\n");
2753                 return -ENOMEM;
2754         }
2755
2756         port_priv->device = device;
2757         port_priv->port_num = port_num;
2758         spin_lock_init(&port_priv->reg_lock);
2759         INIT_LIST_HEAD(&port_priv->agent_list);
2760         init_mad_qp(port_priv, &port_priv->qp_info[0]);
2761         init_mad_qp(port_priv, &port_priv->qp_info[1]);
2762
2763         cq_size = (IB_MAD_QP_SEND_SIZE + IB_MAD_QP_RECV_SIZE) * 2;
2764         port_priv->cq = ib_create_cq(port_priv->device,
2765                                      ib_mad_thread_completion_handler,
2766                                      NULL, port_priv, cq_size);
2767         if (IS_ERR(port_priv->cq)) {
2768                 printk(KERN_ERR PFX "Couldn't create ib_mad CQ\n");
2769                 ret = PTR_ERR(port_priv->cq);
2770                 goto error3;
2771         }
2772
2773         port_priv->pd = ib_alloc_pd(device);
2774         if (IS_ERR(port_priv->pd)) {
2775                 printk(KERN_ERR PFX "Couldn't create ib_mad PD\n");
2776                 ret = PTR_ERR(port_priv->pd);
2777                 goto error4;
2778         }
2779
2780         port_priv->mr = ib_get_dma_mr(port_priv->pd, IB_ACCESS_LOCAL_WRITE);
2781         if (IS_ERR(port_priv->mr)) {
2782                 printk(KERN_ERR PFX "Couldn't get ib_mad DMA MR\n");
2783                 ret = PTR_ERR(port_priv->mr);
2784                 goto error5;
2785         }
2786
2787         ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
2788         if (ret)
2789                 goto error6;
2790         ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI);
2791         if (ret)
2792                 goto error7;
2793
2794         snprintf(name, sizeof name, "ib_mad%d", port_num);
2795         port_priv->wq = create_singlethread_workqueue(name);
2796         if (!port_priv->wq) {
2797                 ret = -ENOMEM;
2798                 goto error8;
2799         }
2800         INIT_WORK(&port_priv->work, ib_mad_completion_handler, port_priv);
2801
2802         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2803         list_add_tail(&port_priv->port_list, &ib_mad_port_list);
2804         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2805
2806         ret = ib_mad_port_start(port_priv);
2807         if (ret) {
2808                 printk(KERN_ERR PFX "Couldn't start port\n");
2809                 goto error9;
2810         }
2811
2812         return 0;
2813
2814 error9:
2815         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2816         list_del_init(&port_priv->port_list);
2817         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2818
2819         destroy_workqueue(port_priv->wq);
2820 error8:
2821         destroy_mad_qp(&port_priv->qp_info[1]);
2822 error7:
2823         destroy_mad_qp(&port_priv->qp_info[0]);
2824 error6:
2825         ib_dereg_mr(port_priv->mr);
2826 error5:
2827         ib_dealloc_pd(port_priv->pd);
2828 error4:
2829         ib_destroy_cq(port_priv->cq);
2830         cleanup_recv_queue(&port_priv->qp_info[1]);
2831         cleanup_recv_queue(&port_priv->qp_info[0]);
2832 error3:
2833         kfree(port_priv);
2834
2835         return ret;
2836 }
2837
2838 /*
2839  * Close the port
2840  * If there are no classes using the port, free the port
2841  * resources (CQ, MR, PD, QP) and remove the port's info structure
2842  */
2843 static int ib_mad_port_close(struct ib_device *device, int port_num)
2844 {
2845         struct ib_mad_port_private *port_priv;
2846         unsigned long flags;
2847
2848         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2849         port_priv = __ib_get_mad_port(device, port_num);
2850         if (port_priv == NULL) {
2851                 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2852                 printk(KERN_ERR PFX "Port %d not found\n", port_num);
2853                 return -ENODEV;
2854         }
2855         list_del_init(&port_priv->port_list);
2856         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2857
2858         destroy_workqueue(port_priv->wq);
2859         destroy_mad_qp(&port_priv->qp_info[1]);
2860         destroy_mad_qp(&port_priv->qp_info[0]);
2861         ib_dereg_mr(port_priv->mr);
2862         ib_dealloc_pd(port_priv->pd);
2863         ib_destroy_cq(port_priv->cq);
2864         cleanup_recv_queue(&port_priv->qp_info[1]);
2865         cleanup_recv_queue(&port_priv->qp_info[0]);
2866         /* XXX: Handle deallocation of MAD registration tables */
2867
2868         kfree(port_priv);
2869
2870         return 0;
2871 }
2872
2873 static void ib_mad_init_device(struct ib_device *device)
2874 {
2875         int start, end, i;
2876
2877         if (device->node_type == IB_NODE_SWITCH) {
2878                 start = 0;
2879                 end   = 0;
2880         } else {
2881                 start = 1;
2882                 end   = device->phys_port_cnt;
2883         }
2884
2885         for (i = start; i <= end; i++) {
2886                 if (ib_mad_port_open(device, i)) {
2887                         printk(KERN_ERR PFX "Couldn't open %s port %d\n",
2888                                device->name, i);
2889                         goto error;
2890                 }
2891                 if (ib_agent_port_open(device, i)) {
2892                         printk(KERN_ERR PFX "Couldn't open %s port %d "
2893                                "for agents\n",
2894                                device->name, i);
2895                         goto error_agent;
2896                 }
2897         }
2898         return;
2899
2900 error_agent:
2901         if (ib_mad_port_close(device, i))
2902                 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2903                        device->name, i);
2904
2905 error:
2906         i--;
2907
2908         while (i >= start) {
2909                 if (ib_agent_port_close(device, i))
2910                         printk(KERN_ERR PFX "Couldn't close %s port %d "
2911                                "for agents\n",
2912                                device->name, i);
2913                 if (ib_mad_port_close(device, i))
2914                         printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2915                                device->name, i);
2916                 i--;
2917         }
2918 }
2919
2920 static void ib_mad_remove_device(struct ib_device *device)
2921 {
2922         int i, num_ports, cur_port;
2923
2924         if (device->node_type == IB_NODE_SWITCH) {
2925                 num_ports = 1;
2926                 cur_port = 0;
2927         } else {
2928                 num_ports = device->phys_port_cnt;
2929                 cur_port = 1;
2930         }
2931         for (i = 0; i < num_ports; i++, cur_port++) {
2932                 if (ib_agent_port_close(device, cur_port))
2933                         printk(KERN_ERR PFX "Couldn't close %s port %d "
2934                                "for agents\n",
2935                                device->name, cur_port);
2936                 if (ib_mad_port_close(device, cur_port))
2937                         printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2938                                device->name, cur_port);
2939         }
2940 }
2941
2942 static struct ib_client mad_client = {
2943         .name   = "mad",
2944         .add = ib_mad_init_device,
2945         .remove = ib_mad_remove_device
2946 };
2947
2948 static int __init ib_mad_init_module(void)
2949 {
2950         int ret;
2951
2952         spin_lock_init(&ib_mad_port_list_lock);
2953
2954         ib_mad_cache = kmem_cache_create("ib_mad",
2955                                          sizeof(struct ib_mad_private),
2956                                          0,
2957                                          SLAB_HWCACHE_ALIGN,
2958                                          NULL,
2959                                          NULL);
2960         if (!ib_mad_cache) {
2961                 printk(KERN_ERR PFX "Couldn't create ib_mad cache\n");
2962                 ret = -ENOMEM;
2963                 goto error1;
2964         }
2965
2966         INIT_LIST_HEAD(&ib_mad_port_list);
2967
2968         if (ib_register_client(&mad_client)) {
2969                 printk(KERN_ERR PFX "Couldn't register ib_mad client\n");
2970                 ret = -EINVAL;
2971                 goto error2;
2972         }
2973
2974         return 0;
2975
2976 error2:
2977         kmem_cache_destroy(ib_mad_cache);
2978 error1:
2979         return ret;
2980 }
2981
2982 static void __exit ib_mad_cleanup_module(void)
2983 {
2984         ib_unregister_client(&mad_client);
2985
2986         if (kmem_cache_destroy(ib_mad_cache)) {
2987                 printk(KERN_DEBUG PFX "Failed to destroy ib_mad cache\n");
2988         }
2989 }
2990
2991 module_init(ib_mad_init_module);
2992 module_exit(ib_mad_cleanup_module);
2993