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 2817 2005-07-07 11:29:26Z halr $
  35  */
  36 #include <linux/dma-mapping.h>
  37
  38 #include "mad_priv.h"
  39 #include "mad_rmpp.h"
  40 #include "smi.h"
  41 #include "agent.h"
  42
  43 MODULE_LICENSE("Dual BSD/GPL");
  44 MODULE_DESCRIPTION("kernel IB MAD API");
  45 MODULE_AUTHOR("Hal Rosenstock");
  46 MODULE_AUTHOR("Sean Hefty");
  47
  48
  49 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 QP type */
 231                 if (qp_type == IB_QPT_SMI) {
 232                         if ((mad_reg_req->mgmt_class !=
 233                                         IB_MGMT_CLASS_SUBN_LID_ROUTED) &&
 234                             (mad_reg_req->mgmt_class !=
 235                                         IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
 236                                 goto error1;
 237                 } else {
 238                         if ((mad_reg_req->mgmt_class ==
 239                                         IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
 240                             (mad_reg_req->mgmt_class ==
 241                                         IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
 242                                 goto error1;
 243                 }
 244         } else {
 245                 /* No registration request supplied */
 246                 if (!send_handler)
 247                         goto error1;
 248         }
 249
 250         /* Validate device and port */
 251         port_priv = ib_get_mad_port(device, port_num);
 252         if (!port_priv) {
 253                 ret = ERR_PTR(-ENODEV);
 254                 goto error1;
 255         }
 256
 257         /* Allocate structures */
 258         mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL);
 259         if (!mad_agent_priv) {
 260                 ret = ERR_PTR(-ENOMEM);
 261                 goto error1;
 262         }
 263
 264         mad_agent_priv->agent.mr = ib_get_dma_mr(port_priv->qp_info[qpn].qp->pd,
 265                                                  IB_ACCESS_LOCAL_WRITE);
 266         if (IS_ERR(mad_agent_priv->agent.mr)) {
 267                 ret = ERR_PTR(-ENOMEM);
 268                 goto error2;
 269         }
 270
 271         if (mad_reg_req) {
 272                 reg_req = kmalloc(sizeof *reg_req, GFP_KERNEL);
 273                 if (!reg_req) {
 274                         ret = ERR_PTR(-ENOMEM);
 275                         goto error3;
 276                 }
 277                 /* Make a copy of the MAD registration request */
 278                 memcpy(reg_req, mad_reg_req, sizeof *reg_req);
 279         }
 280
 281         /* Now, fill in the various structures */
 282         mad_agent_priv->qp_info = &port_priv->qp_info[qpn];
 283         mad_agent_priv->reg_req = reg_req;
 284         mad_agent_priv->agent.rmpp_version = rmpp_version;
 285         mad_agent_priv->agent.device = device;
 286         mad_agent_priv->agent.recv_handler = recv_handler;
 287         mad_agent_priv->agent.send_handler = send_handler;
 288         mad_agent_priv->agent.context = context;
 289         mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp;
 290         mad_agent_priv->agent.port_num = port_num;
 291
 292         spin_lock_irqsave(&port_priv->reg_lock, flags);
 293         mad_agent_priv->agent.hi_tid = ++ib_mad_client_id;
 294
 295         /*
 296          * Make sure MAD registration (if supplied)
 297          * is non overlapping with any existing ones
 298          */
 299         if (mad_reg_req) {
 300                 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class);
 301                 if (!is_vendor_class(mgmt_class)) {
 302                         class = port_priv->version[mad_reg_req->
 303                                                    mgmt_class_version].class;
 304                         if (class) {
 305                                 method = class->method_table[mgmt_class];
 306                                 if (method) {
 307                                         if (method_in_use(&method,
 308                                                            mad_reg_req))
 309                                                 goto error4;
 310                                 }
 311                         }
 312                         ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv,
 313                                                   mgmt_class);
 314                 } else {
 315                         /* "New" vendor class range */
 316                         vendor = port_priv->version[mad_reg_req->
 317                                                     mgmt_class_version].vendor;
 318                         if (vendor) {
 319                                 vclass = vendor_class_index(mgmt_class);
 320                                 vendor_class = vendor->vendor_class[vclass];
 321                                 if (vendor_class) {
 322                                         if (is_vendor_method_in_use(
 323                                                         vendor_class,
 324                                                         mad_reg_req))
 325                                                 goto error4;
 326                                 }
 327                         }
 328                         ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv);
 329                 }
 330                 if (ret2) {
 331                         ret = ERR_PTR(ret2);
 332                         goto error4;
 333                 }
 334         }
 335
 336         /* Add mad agent into port's agent list */
 337         list_add_tail(&mad_agent_priv->agent_list, &port_priv->agent_list);
 338         spin_unlock_irqrestore(&port_priv->reg_lock, flags);
 339
 340         spin_lock_init(&mad_agent_priv->lock);
 341         INIT_LIST_HEAD(&mad_agent_priv->send_list);
 342         INIT_LIST_HEAD(&mad_agent_priv->wait_list);
 343         INIT_LIST_HEAD(&mad_agent_priv->done_list);
 344         INIT_LIST_HEAD(&mad_agent_priv->rmpp_list);
 345         INIT_WORK(&mad_agent_priv->timed_work, timeout_sends, mad_agent_priv);
 346         INIT_LIST_HEAD(&mad_agent_priv->local_list);
 347         INIT_WORK(&mad_agent_priv->local_work, local_completions,
 348                    mad_agent_priv);
 349         atomic_set(&mad_agent_priv->refcount, 1);
 350         init_waitqueue_head(&mad_agent_priv->wait);
 351
 352         return &mad_agent_priv->agent;
 353
 354 error4:
 355         spin_unlock_irqrestore(&port_priv->reg_lock, flags);
 356         kfree(reg_req);
 357 error3:
 358         kfree(mad_agent_priv);
 359 error2:
 360         ib_dereg_mr(mad_agent_priv->agent.mr);
 361 error1:
 362         return ret;
 363 }
 364 EXPORT_SYMBOL(ib_register_mad_agent);
 365
 366 static inline int is_snooping_sends(int mad_snoop_flags)
 367 {
 368         return (mad_snoop_flags &
 369                 (/*IB_MAD_SNOOP_POSTED_SENDS |
 370                  IB_MAD_SNOOP_RMPP_SENDS |*/
 371                  IB_MAD_SNOOP_SEND_COMPLETIONS /*|
 372                  IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS*/));
 373 }
 374
 375 static inline int is_snooping_recvs(int mad_snoop_flags)
 376 {
 377         return (mad_snoop_flags &
 378                 (IB_MAD_SNOOP_RECVS /*|
 379                  IB_MAD_SNOOP_RMPP_RECVS*/));
 380 }
 381
 382 static int register_snoop_agent(struct ib_mad_qp_info *qp_info,
 383                                 struct ib_mad_snoop_private *mad_snoop_priv)
 384 {
 385         struct ib_mad_snoop_private **new_snoop_table;
 386         unsigned long flags;
 387         int i;
 388
 389         spin_lock_irqsave(&qp_info->snoop_lock, flags);
 390         /* Check for empty slot in array. */
 391         for (i = 0; i < qp_info->snoop_table_size; i++)
 392                 if (!qp_info->snoop_table[i])
 393                         break;
 394
 395         if (i == qp_info->snoop_table_size) {
 396                 /* Grow table. */
 397                 new_snoop_table = kmalloc(sizeof mad_snoop_priv *
 398                                           qp_info->snoop_table_size + 1,
 399                                           GFP_ATOMIC);
 400                 if (!new_snoop_table) {
 401                         i = -ENOMEM;
 402                         goto out;
 403                 }
 404                 if (qp_info->snoop_table) {
 405                         memcpy(new_snoop_table, qp_info->snoop_table,
 406                                sizeof mad_snoop_priv *
 407                                qp_info->snoop_table_size);
 408                         kfree(qp_info->snoop_table);
 409                 }
 410                 qp_info->snoop_table = new_snoop_table;
 411                 qp_info->snoop_table_size++;
 412         }
 413         qp_info->snoop_table[i] = mad_snoop_priv;
 414         atomic_inc(&qp_info->snoop_count);
 415 out:
 416         spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 417         return i;
 418 }
 419
 420 struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device,
 421                                            u8 port_num,
 422                                            enum ib_qp_type qp_type,
 423                                            int mad_snoop_flags,
 424                                            ib_mad_snoop_handler snoop_handler,
 425                                            ib_mad_recv_handler recv_handler,
 426                                            void *context)
 427 {
 428         struct ib_mad_port_private *port_priv;
 429         struct ib_mad_agent *ret;
 430         struct ib_mad_snoop_private *mad_snoop_priv;
 431         int qpn;
 432
 433         /* Validate parameters */
 434         if ((is_snooping_sends(mad_snoop_flags) && !snoop_handler) ||
 435             (is_snooping_recvs(mad_snoop_flags) && !recv_handler)) {
 436                 ret = ERR_PTR(-EINVAL);
 437                 goto error1;
 438         }
 439         qpn = get_spl_qp_index(qp_type);
 440         if (qpn == -1) {
 441                 ret = ERR_PTR(-EINVAL);
 442                 goto error1;
 443         }
 444         port_priv = ib_get_mad_port(device, port_num);
 445         if (!port_priv) {
 446                 ret = ERR_PTR(-ENODEV);
 447                 goto error1;
 448         }
 449         /* Allocate structures */
 450         mad_snoop_priv = kzalloc(sizeof *mad_snoop_priv, GFP_KERNEL);
 451         if (!mad_snoop_priv) {
 452                 ret = ERR_PTR(-ENOMEM);
 453                 goto error1;
 454         }
 455
 456         /* Now, fill in the various structures */
 457         mad_snoop_priv->qp_info = &port_priv->qp_info[qpn];
 458         mad_snoop_priv->agent.device = device;
 459         mad_snoop_priv->agent.recv_handler = recv_handler;
 460         mad_snoop_priv->agent.snoop_handler = snoop_handler;
 461         mad_snoop_priv->agent.context = context;
 462         mad_snoop_priv->agent.qp = port_priv->qp_info[qpn].qp;
 463         mad_snoop_priv->agent.port_num = port_num;
 464         mad_snoop_priv->mad_snoop_flags = mad_snoop_flags;
 465         init_waitqueue_head(&mad_snoop_priv->wait);
 466         mad_snoop_priv->snoop_index = register_snoop_agent(
 467                                                 &port_priv->qp_info[qpn],
 468                                                 mad_snoop_priv);
 469         if (mad_snoop_priv->snoop_index < 0) {
 470                 ret = ERR_PTR(mad_snoop_priv->snoop_index);
 471                 goto error2;
 472         }
 473
 474         atomic_set(&mad_snoop_priv->refcount, 1);
 475         return &mad_snoop_priv->agent;
 476
 477 error2:
 478         kfree(mad_snoop_priv);
 479 error1:
 480         return ret;
 481 }
 482 EXPORT_SYMBOL(ib_register_mad_snoop);
 483
 484 static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
 485 {
 486         struct ib_mad_port_private *port_priv;
 487         unsigned long flags;
 488
 489         /* Note that we could still be handling received MADs */
 490
 491         /*
 492          * Canceling all sends results in dropping received response
 493          * MADs, preventing us from queuing additional work
 494          */
 495         cancel_mads(mad_agent_priv);
 496         port_priv = mad_agent_priv->qp_info->port_priv;
 497         cancel_delayed_work(&mad_agent_priv->timed_work);
 498
 499         spin_lock_irqsave(&port_priv->reg_lock, flags);
 500         remove_mad_reg_req(mad_agent_priv);
 501         list_del(&mad_agent_priv->agent_list);
 502         spin_unlock_irqrestore(&port_priv->reg_lock, flags);
 503
 504         flush_workqueue(port_priv->wq);
 505         ib_cancel_rmpp_recvs(mad_agent_priv);
 506
 507         atomic_dec(&mad_agent_priv->refcount);
 508         wait_event(mad_agent_priv->wait,
 509                    !atomic_read(&mad_agent_priv->refcount));
 510
 511         kfree(mad_agent_priv->reg_req);
 512         ib_dereg_mr(mad_agent_priv->agent.mr);
 513         kfree(mad_agent_priv);
 514 }
 515
 516 static void unregister_mad_snoop(struct ib_mad_snoop_private *mad_snoop_priv)
 517 {
 518         struct ib_mad_qp_info *qp_info;
 519         unsigned long flags;
 520
 521         qp_info = mad_snoop_priv->qp_info;
 522         spin_lock_irqsave(&qp_info->snoop_lock, flags);
 523         qp_info->snoop_table[mad_snoop_priv->snoop_index] = NULL;
 524         atomic_dec(&qp_info->snoop_count);
 525         spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 526
 527         atomic_dec(&mad_snoop_priv->refcount);
 528         wait_event(mad_snoop_priv->wait,
 529                    !atomic_read(&mad_snoop_priv->refcount));
 530
 531         kfree(mad_snoop_priv);
 532 }
 533
 534 /*
 535  * ib_unregister_mad_agent - Unregisters a client from using MAD services
 536  */
 537 int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent)
 538 {
 539         struct ib_mad_agent_private *mad_agent_priv;
 540         struct ib_mad_snoop_private *mad_snoop_priv;
 541
 542         /* If the TID is zero, the agent can only snoop. */
 543         if (mad_agent->hi_tid) {
 544                 mad_agent_priv = container_of(mad_agent,
 545                                               struct ib_mad_agent_private,
 546                                               agent);
 547                 unregister_mad_agent(mad_agent_priv);
 548         } else {
 549                 mad_snoop_priv = container_of(mad_agent,
 550                                               struct ib_mad_snoop_private,
 551                                               agent);
 552                 unregister_mad_snoop(mad_snoop_priv);
 553         }
 554         return 0;
 555 }
 556 EXPORT_SYMBOL(ib_unregister_mad_agent);
 557
 558 static inline int response_mad(struct ib_mad *mad)
 559 {
 560         /* Trap represses are responses although response bit is reset */
 561         return ((mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS) ||
 562                 (mad->mad_hdr.method & IB_MGMT_METHOD_RESP));
 563 }
 564
 565 static void dequeue_mad(struct ib_mad_list_head *mad_list)
 566 {
 567         struct ib_mad_queue *mad_queue;
 568         unsigned long flags;
 569
 570         BUG_ON(!mad_list->mad_queue);
 571         mad_queue = mad_list->mad_queue;
 572         spin_lock_irqsave(&mad_queue->lock, flags);
 573         list_del(&mad_list->list);
 574         mad_queue->count--;
 575         spin_unlock_irqrestore(&mad_queue->lock, flags);
 576 }
 577
 578 static void snoop_send(struct ib_mad_qp_info *qp_info,
 579                        struct ib_mad_send_buf *send_buf,
 580                        struct ib_mad_send_wc *mad_send_wc,
 581                        int mad_snoop_flags)
 582 {
 583         struct ib_mad_snoop_private *mad_snoop_priv;
 584         unsigned long flags;
 585         int i;
 586
 587         spin_lock_irqsave(&qp_info->snoop_lock, flags);
 588         for (i = 0; i < qp_info->snoop_table_size; i++) {
 589                 mad_snoop_priv = qp_info->snoop_table[i];
 590                 if (!mad_snoop_priv ||
 591                     !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
 592                         continue;
 593
 594                 atomic_inc(&mad_snoop_priv->refcount);
 595                 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 596                 mad_snoop_priv->agent.snoop_handler(&mad_snoop_priv->agent,
 597                                                     send_buf, mad_send_wc);
 598                 if (atomic_dec_and_test(&mad_snoop_priv->refcount))
 599                         wake_up(&mad_snoop_priv->wait);
 600                 spin_lock_irqsave(&qp_info->snoop_lock, flags);
 601         }
 602         spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 603 }
 604
 605 static void snoop_recv(struct ib_mad_qp_info *qp_info,
 606                        struct ib_mad_recv_wc *mad_recv_wc,
 607                        int mad_snoop_flags)
 608 {
 609         struct ib_mad_snoop_private *mad_snoop_priv;
 610         unsigned long flags;
 611         int i;
 612
 613         spin_lock_irqsave(&qp_info->snoop_lock, flags);
 614         for (i = 0; i < qp_info->snoop_table_size; i++) {
 615                 mad_snoop_priv = qp_info->snoop_table[i];
 616                 if (!mad_snoop_priv ||
 617                     !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
 618                         continue;
 619
 620                 atomic_inc(&mad_snoop_priv->refcount);
 621                 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 622                 mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent,
 623                                                    mad_recv_wc);
 624                 if (atomic_dec_and_test(&mad_snoop_priv->refcount))
 625                         wake_up(&mad_snoop_priv->wait);
 626                 spin_lock_irqsave(&qp_info->snoop_lock, flags);
 627         }
 628         spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 629 }
 630
 631 static void build_smp_wc(u64 wr_id, u16 slid, u16 pkey_index, u8 port_num,
 632                          struct ib_wc *wc)
 633 {
 634         memset(wc, 0, sizeof *wc);
 635         wc->wr_id = wr_id;
 636         wc->status = IB_WC_SUCCESS;
 637         wc->opcode = IB_WC_RECV;
 638         wc->pkey_index = pkey_index;
 639         wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh);
 640         wc->src_qp = IB_QP0;
 641         wc->qp_num = IB_QP0;
 642         wc->slid = slid;
 643         wc->sl = 0;
 644         wc->dlid_path_bits = 0;
 645         wc->port_num = port_num;
 646 }
 647
 648 /*
 649  * Return 0 if SMP is to be sent
 650  * Return 1 if SMP was consumed locally (whether or not solicited)
 651  * Return < 0 if error
 652  */
 653 static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv,
 654                                   struct ib_mad_send_wr_private *mad_send_wr)
 655 {
 656         int ret;
 657         struct ib_smp *smp = mad_send_wr->send_buf.mad;
 658         unsigned long flags;
 659         struct ib_mad_local_private *local;
 660         struct ib_mad_private *mad_priv;
 661         struct ib_mad_port_private *port_priv;
 662         struct ib_mad_agent_private *recv_mad_agent = NULL;
 663         struct ib_device *device = mad_agent_priv->agent.device;
 664         u8 port_num = mad_agent_priv->agent.port_num;
 665         struct ib_wc mad_wc;
 666         struct ib_send_wr *send_wr = &mad_send_wr->send_wr;
 667
 668         if (!smi_handle_dr_smp_send(smp, device->node_type, port_num)) {
 669                 ret = -EINVAL;
 670                 printk(KERN_ERR PFX "Invalid directed route\n");
 671                 goto out;
 672         }
 673         /* Check to post send on QP or process locally */
 674         ret = smi_check_local_dr_smp(smp, device, port_num);
 675         if (!ret || !device->process_mad)
 676                 goto out;
 677
 678         local = kmalloc(sizeof *local, GFP_ATOMIC);
 679         if (!local) {
 680                 ret = -ENOMEM;
 681                 printk(KERN_ERR PFX "No memory for ib_mad_local_private\n");
 682                 goto out;
 683         }
 684         local->mad_priv = NULL;
 685         local->recv_mad_agent = NULL;
 686         mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_ATOMIC);
 687         if (!mad_priv) {
 688                 ret = -ENOMEM;
 689                 printk(KERN_ERR PFX "No memory for local response MAD\n");
 690                 kfree(local);
 691                 goto out;
 692         }
 693
 694         build_smp_wc(send_wr->wr_id, be16_to_cpu(smp->dr_slid),
 695                      send_wr->wr.ud.pkey_index,
 696                      send_wr->wr.ud.port_num, &mad_wc);
 697
 698         /* No GRH for DR SMP */
 699         ret = device->process_mad(device, 0, port_num, &mad_wc, NULL,
 700                                   (struct ib_mad *)smp,
 701                                   (struct ib_mad *)&mad_priv->mad);
 702         switch (ret)
 703         {
 704         case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
 705                 if (response_mad(&mad_priv->mad.mad) &&
 706                     mad_agent_priv->agent.recv_handler) {
 707                         local->mad_priv = mad_priv;
 708                         local->recv_mad_agent = mad_agent_priv;
 709                         /*
 710                          * Reference MAD agent until receive
 711                          * side of local completion handled
 712                          */
 713                         atomic_inc(&mad_agent_priv->refcount);
 714                 } else
 715                         kmem_cache_free(ib_mad_cache, mad_priv);
 716                 break;
 717         case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
 718                 kmem_cache_free(ib_mad_cache, mad_priv);
 719                 break;
 720         case IB_MAD_RESULT_SUCCESS:
 721                 /* Treat like an incoming receive MAD */
 722                 port_priv = ib_get_mad_port(mad_agent_priv->agent.device,
 723                                             mad_agent_priv->agent.port_num);
 724                 if (port_priv) {
 725                         mad_priv->mad.mad.mad_hdr.tid =
 726                                 ((struct ib_mad *)smp)->mad_hdr.tid;
 727                         recv_mad_agent = find_mad_agent(port_priv,
 728                                                         &mad_priv->mad.mad);
 729                 }
 730                 if (!port_priv || !recv_mad_agent) {
 731                         kmem_cache_free(ib_mad_cache, mad_priv);
 732                         kfree(local);
 733                         ret = 0;
 734                         goto out;
 735                 }
 736                 local->mad_priv = mad_priv;
 737                 local->recv_mad_agent = recv_mad_agent;
 738                 break;
 739         default:
 740                 kmem_cache_free(ib_mad_cache, mad_priv);
 741                 kfree(local);
 742                 ret = -EINVAL;
 743                 goto out;
 744         }
 745
 746         local->mad_send_wr = mad_send_wr;
 747         /* Reference MAD agent until send side of local completion handled */
 748         atomic_inc(&mad_agent_priv->refcount);
 749         /* Queue local completion to local list */
 750         spin_lock_irqsave(&mad_agent_priv->lock, flags);
 751         list_add_tail(&local->completion_list, &mad_agent_priv->local_list);
 752         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
 753         queue_work(mad_agent_priv->qp_info->port_priv->wq,
 754                    &mad_agent_priv->local_work);
 755         ret = 1;
 756 out:
 757         return ret;
 758 }
 759
 760 static int get_buf_length(int hdr_len, int data_len)
 761 {
 762         int seg_size, pad;
 763
 764         seg_size = sizeof(struct ib_mad) - hdr_len;
 765         if (data_len && seg_size) {
 766                 pad = seg_size - data_len % seg_size;
 767                 if (pad == seg_size)
 768                         pad = 0;
 769         } else
 770                 pad = seg_size;
 771         return hdr_len + data_len + pad;
 772 }
 773
 774 struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
 775                                             u32 remote_qpn, u16 pkey_index,
 776                                             int rmpp_active,
 777                                             int hdr_len, int data_len,
 778                                             gfp_t gfp_mask)
 779 {
 780         struct ib_mad_agent_private *mad_agent_priv;
 781         struct ib_mad_send_wr_private *mad_send_wr;
 782         int buf_size;
 783         void *buf;
 784
 785         mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
 786                                       agent);
 787         buf_size = get_buf_length(hdr_len, data_len);
 788
 789         if ((!mad_agent->rmpp_version &&
 790              (rmpp_active || buf_size > sizeof(struct ib_mad))) ||
 791             (!rmpp_active && buf_size > sizeof(struct ib_mad)))
 792                 return ERR_PTR(-EINVAL);
 793
 794         buf = kzalloc(sizeof *mad_send_wr + buf_size, gfp_mask);
 795         if (!buf)
 796                 return ERR_PTR(-ENOMEM);
 797
 798         mad_send_wr = buf + buf_size;
 799         mad_send_wr->send_buf.mad = buf;
 800
 801         mad_send_wr->mad_agent_priv = mad_agent_priv;
 802         mad_send_wr->sg_list[0].length = buf_size;
 803         mad_send_wr->sg_list[0].lkey = mad_agent->mr->lkey;
 804
 805         mad_send_wr->send_wr.wr_id = (unsigned long) mad_send_wr;
 806         mad_send_wr->send_wr.sg_list = mad_send_wr->sg_list;
 807         mad_send_wr->send_wr.num_sge = 1;
 808         mad_send_wr->send_wr.opcode = IB_WR_SEND;
 809         mad_send_wr->send_wr.send_flags = IB_SEND_SIGNALED;
 810         mad_send_wr->send_wr.wr.ud.remote_qpn = remote_qpn;
 811         mad_send_wr->send_wr.wr.ud.remote_qkey = IB_QP_SET_QKEY;
 812         mad_send_wr->send_wr.wr.ud.pkey_index = pkey_index;
 813
 814         if (rmpp_active) {
 815                 struct ib_rmpp_mad *rmpp_mad = mad_send_wr->send_buf.mad;
 816                 rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(hdr_len -
 817                                                    IB_MGMT_RMPP_HDR + data_len);
 818                 rmpp_mad->rmpp_hdr.rmpp_version = mad_agent->rmpp_version;
 819                 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA;
 820                 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr,
 821                                   IB_MGMT_RMPP_FLAG_ACTIVE);
 822         }
 823
 824         mad_send_wr->send_buf.mad_agent = mad_agent;
 825         atomic_inc(&mad_agent_priv->refcount);
 826         return &mad_send_wr->send_buf;
 827 }
 828 EXPORT_SYMBOL(ib_create_send_mad);
 829
 830 void ib_free_send_mad(struct ib_mad_send_buf *send_buf)
 831 {
 832         struct ib_mad_agent_private *mad_agent_priv;
 833
 834         mad_agent_priv = container_of(send_buf->mad_agent,
 835                                       struct ib_mad_agent_private, agent);
 836         kfree(send_buf->mad);
 837
 838         if (atomic_dec_and_test(&mad_agent_priv->refcount))
 839                 wake_up(&mad_agent_priv->wait);
 840 }
 841 EXPORT_SYMBOL(ib_free_send_mad);
 842
 843 int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr)
 844 {
 845         struct ib_mad_qp_info *qp_info;
 846         struct list_head *list;
 847         struct ib_send_wr *bad_send_wr;
 848         struct ib_mad_agent *mad_agent;
 849         struct ib_sge *sge;
 850         unsigned long flags;
 851         int ret;
 852
 853         /* Set WR ID to find mad_send_wr upon completion */
 854         qp_info = mad_send_wr->mad_agent_priv->qp_info;
 855         mad_send_wr->send_wr.wr_id = (unsigned long)&mad_send_wr->mad_list;
 856         mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;
 857
 858         mad_agent = mad_send_wr->send_buf.mad_agent;
 859         sge = mad_send_wr->sg_list;
 860         sge->addr = dma_map_single(mad_agent->device->dma_device,
 861                                    mad_send_wr->send_buf.mad, sge->length,
 862                                    DMA_TO_DEVICE);
 863         pci_unmap_addr_set(mad_send_wr, mapping, sge->addr);
 864
 865         spin_lock_irqsave(&qp_info->send_queue.lock, flags);
 866         if (qp_info->send_queue.count < qp_info->send_queue.max_active) {
 867                 ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr,
 868                                    &bad_send_wr);
 869                 list = &qp_info->send_queue.list;
 870         } else {
 871                 ret = 0;
 872                 list = &qp_info->overflow_list;
 873         }
 874
 875         if (!ret) {
 876                 qp_info->send_queue.count++;
 877                 list_add_tail(&mad_send_wr->mad_list.list, list);
 878         }
 879         spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
 880         if (ret)
 881                 dma_unmap_single(mad_agent->device->dma_device,
 882                                  pci_unmap_addr(mad_send_wr, mapping),
 883                                  sge->length, DMA_TO_DEVICE);
 884
 885         return ret;
 886 }
 887
 888 /*
 889  * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
 890  *  with the registered client
 891  */
 892 int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
 893                      struct ib_mad_send_buf **bad_send_buf)
 894 {
 895         struct ib_mad_agent_private *mad_agent_priv;
 896         struct ib_mad_send_buf *next_send_buf;
 897         struct ib_mad_send_wr_private *mad_send_wr;
 898         unsigned long flags;
 899         int ret = -EINVAL;
 900
 901         /* Walk list of send WRs and post each on send list */
 902         for (; send_buf; send_buf = next_send_buf) {
 903
 904                 mad_send_wr = container_of(send_buf,
 905                                            struct ib_mad_send_wr_private,
 906                                            send_buf);
 907                 mad_agent_priv = mad_send_wr->mad_agent_priv;
 908
 909                 if (!send_buf->mad_agent->send_handler ||
 910                     (send_buf->timeout_ms &&
 911                      !send_buf->mad_agent->recv_handler)) {
 912                         ret = -EINVAL;
 913                         goto error;
 914                 }
 915
 916                 /*
 917                  * Save pointer to next work request to post in case the
 918                  * current one completes, and the user modifies the work
 919                  * request associated with the completion
 920                  */
 921                 next_send_buf = send_buf->next;
 922                 mad_send_wr->send_wr.wr.ud.ah = send_buf->ah;
 923
 924                 if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class ==
 925                     IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
 926                         ret = handle_outgoing_dr_smp(mad_agent_priv,
 927                                                      mad_send_wr);
 928                         if (ret < 0)            /* error */
 929                                 goto error;
 930                         else if (ret == 1)      /* locally consumed */
 931                                 continue;
 932                 }
 933
 934                 mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid;
 935                 /* Timeout will be updated after send completes */
 936                 mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms);
 937                 mad_send_wr->retries = send_buf->retries;
 938                 /* Reference for work request to QP + response */
 939                 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0);
 940                 mad_send_wr->status = IB_WC_SUCCESS;
 941
 942                 /* Reference MAD agent until send completes */
 943                 atomic_inc(&mad_agent_priv->refcount);
 944                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
 945                 list_add_tail(&mad_send_wr->agent_list,
 946                               &mad_agent_priv->send_list);
 947                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
 948
 949                 if (mad_agent_priv->agent.rmpp_version) {
 950                         ret = ib_send_rmpp_mad(mad_send_wr);
 951                         if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED)
 952                                 ret = ib_send_mad(mad_send_wr);
 953                 } else
 954                         ret = ib_send_mad(mad_send_wr);
 955                 if (ret < 0) {
 956                         /* Fail send request */
 957                         spin_lock_irqsave(&mad_agent_priv->lock, flags);
 958                         list_del(&mad_send_wr->agent_list);
 959                         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
 960                         atomic_dec(&mad_agent_priv->refcount);
 961                         goto error;
 962                 }
 963         }
 964         return 0;
 965 error:
 966         if (bad_send_buf)
 967                 *bad_send_buf = send_buf;
 968         return ret;
 969 }
 970 EXPORT_SYMBOL(ib_post_send_mad);
 971
 972 /*
 973  * ib_free_recv_mad - Returns data buffers used to receive
 974  *  a MAD to the access layer
 975  */
 976 void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc)
 977 {
 978         struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf;
 979         struct ib_mad_private_header *mad_priv_hdr;
 980         struct ib_mad_private *priv;
 981         struct list_head free_list;
 982
 983         INIT_LIST_HEAD(&free_list);
 984         list_splice_init(&mad_recv_wc->rmpp_list, &free_list);
 985
 986         list_for_each_entry_safe(mad_recv_buf, temp_recv_buf,
 987                                         &free_list, list) {
 988                 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc,
 989                                            recv_buf);
 990                 mad_priv_hdr = container_of(mad_recv_wc,
 991                                             struct ib_mad_private_header,
 992                                             recv_wc);
 993                 priv = container_of(mad_priv_hdr, struct ib_mad_private,
 994                                     header);
 995                 kmem_cache_free(ib_mad_cache, priv);
 996         }
 997 }
 998 EXPORT_SYMBOL(ib_free_recv_mad);
 999
1000 struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
1001                                         u8 rmpp_version,
1002                                         ib_mad_send_handler send_handler,
1003                                         ib_mad_recv_handler recv_handler,
1004                                         void *context)
1005 {
1006         return ERR_PTR(-EINVAL);        /* XXX: for now */
1007 }
1008 EXPORT_SYMBOL(ib_redirect_mad_qp);
1009
1010 int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
1011                       struct ib_wc *wc)
1012 {
1013         printk(KERN_ERR PFX "ib_process_mad_wc() not implemented yet\n");
1014         return 0;
1015 }
1016 EXPORT_SYMBOL(ib_process_mad_wc);
1017
1018 static int method_in_use(struct ib_mad_mgmt_method_table **method,
1019                          struct ib_mad_reg_req *mad_reg_req)
1020 {
1021         int i;
1022
1023         for (i = find_first_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS);
1024              i < IB_MGMT_MAX_METHODS;
1025              i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1026                                1+i)) {
1027                 if ((*method)->agent[i]) {
1028                         printk(KERN_ERR PFX "Method %d already in use\n", i);
1029                         return -EINVAL;
1030                 }
1031         }
1032         return 0;
1033 }
1034
1035 static int allocate_method_table(struct ib_mad_mgmt_method_table **method)
1036 {
1037         /* Allocate management method table */
1038         *method = kzalloc(sizeof **method, GFP_ATOMIC);
1039         if (!*method) {
1040                 printk(KERN_ERR PFX "No memory for "
1041                        "ib_mad_mgmt_method_table\n");
1042                 return -ENOMEM;
1043         }
1044
1045         return 0;
1046 }
1047
1048 /*
1049  * Check to see if there are any methods still in use
1050  */
1051 static int check_method_table(struct ib_mad_mgmt_method_table *method)
1052 {
1053         int i;
1054
1055         for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
1056                 if (method->agent[i])
1057                         return 1;
1058         return 0;
1059 }
1060
1061 /*
1062  * Check to see if there are any method tables for this class still in use
1063  */
1064 static int check_class_table(struct ib_mad_mgmt_class_table *class)
1065 {
1066         int i;
1067
1068         for (i = 0; i < MAX_MGMT_CLASS; i++)
1069                 if (class->method_table[i])
1070                         return 1;
1071         return 0;
1072 }
1073
1074 static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class)
1075 {
1076         int i;
1077
1078         for (i = 0; i < MAX_MGMT_OUI; i++)
1079                 if (vendor_class->method_table[i])
1080                         return 1;
1081         return 0;
1082 }
1083
1084 static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class,
1085                            char *oui)
1086 {
1087         int i;
1088
1089         for (i = 0; i < MAX_MGMT_OUI; i++)
1090                 /* Is there matching OUI for this vendor class ? */
1091                 if (!memcmp(vendor_class->oui[i], oui, 3))
1092                         return i;
1093
1094         return -1;
1095 }
1096
1097 static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor)
1098 {
1099         int i;
1100
1101         for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++)
1102                 if (vendor->vendor_class[i])
1103                         return 1;
1104
1105         return 0;
1106 }
1107
1108 static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method,
1109                                      struct ib_mad_agent_private *agent)
1110 {
1111         int i;
1112
1113         /* Remove any methods for this mad agent */
1114         for (i = 0; i < IB_MGMT_MAX_METHODS; i++) {
1115                 if (method->agent[i] == agent) {
1116                         method->agent[i] = NULL;
1117                 }
1118         }
1119 }
1120
1121 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1122                               struct ib_mad_agent_private *agent_priv,
1123                               u8 mgmt_class)
1124 {
1125         struct ib_mad_port_private *port_priv;
1126         struct ib_mad_mgmt_class_table **class;
1127         struct ib_mad_mgmt_method_table **method;
1128         int i, ret;
1129
1130         port_priv = agent_priv->qp_info->port_priv;
1131         class = &port_priv->version[mad_reg_req->mgmt_class_version].class;
1132         if (!*class) {
1133                 /* Allocate management class table for "new" class version */
1134                 *class = kzalloc(sizeof **class, GFP_ATOMIC);
1135                 if (!*class) {
1136                         printk(KERN_ERR PFX "No memory for "
1137                                "ib_mad_mgmt_class_table\n");
1138                         ret = -ENOMEM;
1139                         goto error1;
1140                 }
1141
1142                 /* Allocate method table for this management class */
1143                 method = &(*class)->method_table[mgmt_class];
1144                 if ((ret = allocate_method_table(method)))
1145                         goto error2;
1146         } else {
1147                 method = &(*class)->method_table[mgmt_class];
1148                 if (!*method) {
1149                         /* Allocate method table for this management class */
1150                         if ((ret = allocate_method_table(method)))
1151                                 goto error1;
1152                 }
1153         }
1154
1155         /* Now, make sure methods are not already in use */
1156         if (method_in_use(method, mad_reg_req))
1157                 goto error3;
1158
1159         /* Finally, add in methods being registered */
1160         for (i = find_first_bit(mad_reg_req->method_mask,
1161                                 IB_MGMT_MAX_METHODS);
1162              i < IB_MGMT_MAX_METHODS;
1163              i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1164                                1+i)) {
1165                 (*method)->agent[i] = agent_priv;
1166         }
1167         return 0;
1168
1169 error3:
1170         /* Remove any methods for this mad agent */
1171         remove_methods_mad_agent(*method, agent_priv);
1172         /* Now, check to see if there are any methods in use */
1173         if (!check_method_table(*method)) {
1174                 /* If not, release management method table */
1175                 kfree(*method);
1176                 *method = NULL;
1177         }
1178         ret = -EINVAL;
1179         goto error1;
1180 error2:
1181         kfree(*class);
1182         *class = NULL;
1183 error1:
1184         return ret;
1185 }
1186
1187 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1188                            struct ib_mad_agent_private *agent_priv)
1189 {
1190         struct ib_mad_port_private *port_priv;
1191         struct ib_mad_mgmt_vendor_class_table **vendor_table;
1192         struct ib_mad_mgmt_vendor_class_table *vendor = NULL;
1193         struct ib_mad_mgmt_vendor_class *vendor_class = NULL;
1194         struct ib_mad_mgmt_method_table **method;
1195         int i, ret = -ENOMEM;
1196         u8 vclass;
1197
1198         /* "New" vendor (with OUI) class */
1199         vclass = vendor_class_index(mad_reg_req->mgmt_class);
1200         port_priv = agent_priv->qp_info->port_priv;
1201         vendor_table = &port_priv->version[
1202                                 mad_reg_req->mgmt_class_version].vendor;
1203         if (!*vendor_table) {
1204                 /* Allocate mgmt vendor class table for "new" class version */
1205                 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC);
1206                 if (!vendor) {
1207                         printk(KERN_ERR PFX "No memory for "
1208                                "ib_mad_mgmt_vendor_class_table\n");
1209                         goto error1;
1210                 }
1211
1212                 *vendor_table = vendor;
1213         }
1214         if (!(*vendor_table)->vendor_class[vclass]) {
1215                 /* Allocate table for this management vendor class */
1216                 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC);
1217                 if (!vendor_class) {
1218                         printk(KERN_ERR PFX "No memory for "
1219                                "ib_mad_mgmt_vendor_class\n");
1220                         goto error2;
1221                 }
1222
1223                 (*vendor_table)->vendor_class[vclass] = vendor_class;
1224         }
1225         for (i = 0; i < MAX_MGMT_OUI; i++) {
1226                 /* Is there matching OUI for this vendor class ? */
1227                 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i],
1228                             mad_reg_req->oui, 3)) {
1229                         method = &(*vendor_table)->vendor_class[
1230                                                 vclass]->method_table[i];
1231                         BUG_ON(!*method);
1232                         goto check_in_use;
1233                 }
1234         }
1235         for (i = 0; i < MAX_MGMT_OUI; i++) {
1236                 /* OUI slot available ? */
1237                 if (!is_vendor_oui((*vendor_table)->vendor_class[
1238                                 vclass]->oui[i])) {
1239                         method = &(*vendor_table)->vendor_class[
1240                                 vclass]->method_table[i];
1241                         BUG_ON(*method);
1242                         /* Allocate method table for this OUI */
1243                         if ((ret = allocate_method_table(method)))
1244                                 goto error3;
1245                         memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
1246                                mad_reg_req->oui, 3);
1247                         goto check_in_use;
1248                 }
1249         }
1250         printk(KERN_ERR PFX "All OUI slots in use\n");
1251         goto error3;
1252
1253 check_in_use:
1254         /* Now, make sure methods are not already in use */
1255         if (method_in_use(method, mad_reg_req))
1256                 goto error4;
1257
1258         /* Finally, add in methods being registered */
1259         for (i = find_first_bit(mad_reg_req->method_mask,
1260                                 IB_MGMT_MAX_METHODS);
1261              i < IB_MGMT_MAX_METHODS;
1262              i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1263                                1+i)) {
1264                 (*method)->agent[i] = agent_priv;
1265         }
1266         return 0;
1267
1268 error4:
1269         /* Remove any methods for this mad agent */
1270         remove_methods_mad_agent(*method, agent_priv);
1271         /* Now, check to see if there are any methods in use */
1272         if (!check_method_table(*method)) {
1273                 /* If not, release management method table */
1274                 kfree(*method);
1275                 *method = NULL;
1276         }
1277         ret = -EINVAL;
1278 error3:
1279         if (vendor_class) {
1280                 (*vendor_table)->vendor_class[vclass] = NULL;
1281                 kfree(vendor_class);
1282         }
1283 error2:
1284         if (vendor) {
1285                 *vendor_table = NULL;
1286                 kfree(vendor);
1287         }
1288 error1:
1289         return ret;
1290 }
1291
1292 static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv)
1293 {
1294         struct ib_mad_port_private *port_priv;
1295         struct ib_mad_mgmt_class_table *class;
1296         struct ib_mad_mgmt_method_table *method;
1297         struct ib_mad_mgmt_vendor_class_table *vendor;
1298         struct ib_mad_mgmt_vendor_class *vendor_class;
1299         int index;
1300         u8 mgmt_class;
1301
1302         /*
1303          * Was MAD registration request supplied
1304          * with original registration ?
1305          */
1306         if (!agent_priv->reg_req) {
1307                 goto out;
1308         }
1309
1310         port_priv = agent_priv->qp_info->port_priv;
1311         mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class);
1312         class = port_priv->version[
1313                         agent_priv->reg_req->mgmt_class_version].class;
1314         if (!class)
1315                 goto vendor_check;
1316
1317         method = class->method_table[mgmt_class];
1318         if (method) {
1319                 /* Remove any methods for this mad agent */
1320                 remove_methods_mad_agent(method, agent_priv);
1321                 /* Now, check to see if there are any methods still in use */
1322                 if (!check_method_table(method)) {
1323                         /* If not, release management method table */
1324                          kfree(method);
1325                          class->method_table[mgmt_class] = NULL;
1326                          /* Any management classes left ? */
1327                         if (!check_class_table(class)) {
1328                                 /* If not, release management class table */
1329                                 kfree(class);
1330                                 port_priv->version[
1331                                         agent_priv->reg_req->
1332                                         mgmt_class_version].class = NULL;
1333                         }
1334                 }
1335         }
1336
1337 vendor_check:
1338         if (!is_vendor_class(mgmt_class))
1339                 goto out;
1340
1341         /* normalize mgmt_class to vendor range 2 */
1342         mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class);
1343         vendor = port_priv->version[
1344                         agent_priv->reg_req->mgmt_class_version].vendor;
1345
1346         if (!vendor)
1347                 goto out;
1348
1349         vendor_class = vendor->vendor_class[mgmt_class];
1350         if (vendor_class) {
1351                 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui);
1352                 if (index < 0)
1353                         goto out;
1354                 method = vendor_class->method_table[index];
1355                 if (method) {
1356                         /* Remove any methods for this mad agent */
1357                         remove_methods_mad_agent(method, agent_priv);
1358                         /*
1359                          * Now, check to see if there are
1360                          * any methods still in use
1361                          */
1362                         if (!check_method_table(method)) {
1363                                 /* If not, release management method table */
1364                                 kfree(method);
1365                                 vendor_class->method_table[index] = NULL;
1366                                 memset(vendor_class->oui[index], 0, 3);
1367                                 /* Any OUIs left ? */
1368                                 if (!check_vendor_class(vendor_class)) {
1369                                         /* If not, release vendor class table */
1370                                         kfree(vendor_class);
1371                                         vendor->vendor_class[mgmt_class] = NULL;
1372                                         /* Any other vendor classes left ? */
1373                                         if (!check_vendor_table(vendor)) {
1374                                                 kfree(vendor);
1375                                                 port_priv->version[
1376                                                         agent_priv->reg_req->
1377                                                         mgmt_class_version].
1378                                                         vendor = NULL;
1379                                         }
1380                                 }
1381                         }
1382                 }
1383         }
1384
1385 out:
1386         return;
1387 }
1388
1389 static struct ib_mad_agent_private *
1390 find_mad_agent(struct ib_mad_port_private *port_priv,
1391                struct ib_mad *mad)
1392 {
1393         struct ib_mad_agent_private *mad_agent = NULL;
1394         unsigned long flags;
1395
1396         spin_lock_irqsave(&port_priv->reg_lock, flags);
1397         if (response_mad(mad)) {
1398                 u32 hi_tid;
1399                 struct ib_mad_agent_private *entry;
1400
1401                 /*
1402                  * Routing is based on high 32 bits of transaction ID
1403                  * of MAD.
1404                  */
1405                 hi_tid = be64_to_cpu(mad->mad_hdr.tid) >> 32;
1406                 list_for_each_entry(entry, &port_priv->agent_list, agent_list) {
1407                         if (entry->agent.hi_tid == hi_tid) {
1408                                 mad_agent = entry;
1409                                 break;
1410                         }
1411                 }
1412         } else {
1413                 struct ib_mad_mgmt_class_table *class;
1414                 struct ib_mad_mgmt_method_table *method;
1415                 struct ib_mad_mgmt_vendor_class_table *vendor;
1416                 struct ib_mad_mgmt_vendor_class *vendor_class;
1417                 struct ib_vendor_mad *vendor_mad;
1418                 int index;
1419
1420                 /*
1421                  * Routing is based on version, class, and method
1422                  * For "newer" vendor MADs, also based on OUI
1423                  */
1424                 if (mad->mad_hdr.class_version >= MAX_MGMT_VERSION)
1425                         goto out;
1426                 if (!is_vendor_class(mad->mad_hdr.mgmt_class)) {
1427                         class = port_priv->version[
1428                                         mad->mad_hdr.class_version].class;
1429                         if (!class)
1430                                 goto out;
1431                         method = class->method_table[convert_mgmt_class(
1432                                                         mad->mad_hdr.mgmt_class)];
1433                         if (method)
1434                                 mad_agent = method->agent[mad->mad_hdr.method &
1435                                                           ~IB_MGMT_METHOD_RESP];
1436                 } else {
1437                         vendor = port_priv->version[
1438                                         mad->mad_hdr.class_version].vendor;
1439                         if (!vendor)
1440                                 goto out;
1441                         vendor_class = vendor->vendor_class[vendor_class_index(
1442                                                 mad->mad_hdr.mgmt_class)];
1443                         if (!vendor_class)
1444                                 goto out;
1445                         /* Find matching OUI */
1446                         vendor_mad = (struct ib_vendor_mad *)mad;
1447                         index = find_vendor_oui(vendor_class, vendor_mad->oui);
1448                         if (index == -1)
1449                                 goto out;
1450                         method = vendor_class->method_table[index];
1451                         if (method) {
1452                                 mad_agent = method->agent[mad->mad_hdr.method &
1453                                                           ~IB_MGMT_METHOD_RESP];
1454                         }
1455                 }
1456         }
1457
1458         if (mad_agent) {
1459                 if (mad_agent->agent.recv_handler)
1460                         atomic_inc(&mad_agent->refcount);
1461                 else {
1462                         printk(KERN_NOTICE PFX "No receive handler for client "
1463                                "%p on port %d\n",
1464                                &mad_agent->agent, port_priv->port_num);
1465                         mad_agent = NULL;
1466                 }
1467         }
1468 out:
1469         spin_unlock_irqrestore(&port_priv->reg_lock, flags);
1470
1471         return mad_agent;
1472 }
1473
1474 static int validate_mad(struct ib_mad *mad, u32 qp_num)
1475 {
1476         int valid = 0;
1477
1478         /* Make sure MAD base version is understood */
1479         if (mad->mad_hdr.base_version != IB_MGMT_BASE_VERSION) {
1480                 printk(KERN_ERR PFX "MAD received with unsupported base "
1481                        "version %d\n", mad->mad_hdr.base_version);
1482                 goto out;
1483         }
1484
1485         /* Filter SMI packets sent to other than QP0 */
1486         if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
1487             (mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
1488                 if (qp_num == 0)
1489                         valid = 1;
1490         } else {
1491                 /* Filter GSI packets sent to QP0 */
1492                 if (qp_num != 0)
1493                         valid = 1;
1494         }
1495
1496 out:
1497         return valid;
1498 }
1499
1500 static int is_data_mad(struct ib_mad_agent_private *mad_agent_priv,
1501                        struct ib_mad_hdr *mad_hdr)
1502 {
1503         struct ib_rmpp_mad *rmpp_mad;
1504
1505         rmpp_mad = (struct ib_rmpp_mad *)mad_hdr;
1506         return !mad_agent_priv->agent.rmpp_version ||
1507                 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
1508                                     IB_MGMT_RMPP_FLAG_ACTIVE) ||
1509                 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA);
1510 }
1511
1512 struct ib_mad_send_wr_private*
1513 ib_find_send_mad(struct ib_mad_agent_private *mad_agent_priv, __be64 tid)
1514 {
1515         struct ib_mad_send_wr_private *mad_send_wr;
1516
1517         list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
1518                             agent_list) {
1519                 if (mad_send_wr->tid == tid)
1520                         return mad_send_wr;
1521         }
1522
1523         /*
1524          * It's possible to receive the response before we've
1525          * been notified that the send has completed
1526          */
1527         list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
1528                             agent_list) {
1529                 if (is_data_mad(mad_agent_priv, mad_send_wr->send_buf.mad) &&
1530                     mad_send_wr->tid == tid && mad_send_wr->timeout) {
1531                         /* Verify request has not been canceled */
1532                         return (mad_send_wr->status == IB_WC_SUCCESS) ?
1533                                 mad_send_wr : NULL;
1534                 }
1535         }
1536         return NULL;
1537 }
1538
1539 void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr)
1540 {
1541         mad_send_wr->timeout = 0;
1542         if (mad_send_wr->refcount == 1) {
1543                 list_del(&mad_send_wr->agent_list);
1544                 list_add_tail(&mad_send_wr->agent_list,
1545                               &mad_send_wr->mad_agent_priv->done_list);
1546         }
1547 }
1548
1549 static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
1550                                  struct ib_mad_recv_wc *mad_recv_wc)
1551 {
1552         struct ib_mad_send_wr_private *mad_send_wr;
1553         struct ib_mad_send_wc mad_send_wc;
1554         unsigned long flags;
1555         __be64 tid;
1556
1557         INIT_LIST_HEAD(&mad_recv_wc->rmpp_list);
1558         list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list);
1559         if (mad_agent_priv->agent.rmpp_version) {
1560                 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv,
1561                                                       mad_recv_wc);
1562                 if (!mad_recv_wc) {
1563                         if (atomic_dec_and_test(&mad_agent_priv->refcount))
1564                                 wake_up(&mad_agent_priv->wait);
1565                         return;
1566                 }
1567         }
1568
1569         /* Complete corresponding request */
1570         if (response_mad(mad_recv_wc->recv_buf.mad)) {
1571                 tid = mad_recv_wc->recv_buf.mad->mad_hdr.tid;
1572                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1573                 mad_send_wr = ib_find_send_mad(mad_agent_priv, tid);
1574                 if (!mad_send_wr) {
1575                         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1576                         ib_free_recv_mad(mad_recv_wc);
1577                         if (atomic_dec_and_test(&mad_agent_priv->refcount))
1578                                 wake_up(&mad_agent_priv->wait);
1579                         return;
1580                 }
1581                 ib_mark_mad_done(mad_send_wr);
1582                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1583
1584                 /* Defined behavior is to complete response before request */
1585                 mad_recv_wc->wc->wr_id = (unsigned long) &mad_send_wr->send_buf;
1586                 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1587                                                    mad_recv_wc);
1588                 atomic_dec(&mad_agent_priv->refcount);
1589
1590                 mad_send_wc.status = IB_WC_SUCCESS;
1591                 mad_send_wc.vendor_err = 0;
1592                 mad_send_wc.send_buf = &mad_send_wr->send_buf;
1593                 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
1594         } else {
1595                 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1596                                                    mad_recv_wc);
1597                 if (atomic_dec_and_test(&mad_agent_priv->refcount))
1598                         wake_up(&mad_agent_priv->wait);
1599         }
1600 }
1601
1602 static void ib_mad_recv_done_handler(struct ib_mad_port_private *port_priv,
1603                                      struct ib_wc *wc)
1604 {
1605         struct ib_mad_qp_info *qp_info;
1606         struct ib_mad_private_header *mad_priv_hdr;
1607         struct ib_mad_private *recv, *response;
1608         struct ib_mad_list_head *mad_list;
1609         struct ib_mad_agent_private *mad_agent;
1610
1611         response = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
1612         if (!response)
1613                 printk(KERN_ERR PFX "ib_mad_recv_done_handler no memory "
1614                        "for response buffer\n");
1615
1616         mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
1617         qp_info = mad_list->mad_queue->qp_info;
1618         dequeue_mad(mad_list);
1619
1620         mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header,
1621                                     mad_list);
1622         recv = container_of(mad_priv_hdr, struct ib_mad_private, header);
1623         dma_unmap_single(port_priv->device->dma_device,
1624                          pci_unmap_addr(&recv->header, mapping),
1625                          sizeof(struct ib_mad_private) -
1626                          sizeof(struct ib_mad_private_header),
1627                          DMA_FROM_DEVICE);
1628
1629         /* Setup MAD receive work completion from "normal" work completion */
1630         recv->header.wc = *wc;
1631         recv->header.recv_wc.wc = &recv->header.wc;
1632         recv->header.recv_wc.mad_len = sizeof(struct ib_mad);
1633         recv->header.recv_wc.recv_buf.mad = &recv->mad.mad;
1634         recv->header.recv_wc.recv_buf.grh = &recv->grh;
1635
1636         if (atomic_read(&qp_info->snoop_count))
1637                 snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS);
1638
1639         /* Validate MAD */
1640         if (!validate_mad(&recv->mad.mad, qp_info->qp->qp_num))
1641                 goto out;
1642
1643         if (recv->mad.mad.mad_hdr.mgmt_class ==
1644             IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1645                 if (!smi_handle_dr_smp_recv(&recv->mad.smp,
1646                                             port_priv->device->node_type,
1647                                             port_priv->port_num,
1648                                             port_priv->device->phys_port_cnt))
1649                         goto out;
1650                 if (!smi_check_forward_dr_smp(&recv->mad.smp))
1651                         goto local;
1652                 if (!smi_handle_dr_smp_send(&recv->mad.smp,
1653                                             port_priv->device->node_type,
1654                                             port_priv->port_num))
1655                         goto out;
1656                 if (!smi_check_local_dr_smp(&recv->mad.smp,
1657                                             port_priv->device,
1658                                             port_priv->port_num))
1659                         goto out;
1660         }
1661
1662 local:
1663         /* Give driver "right of first refusal" on incoming MAD */
1664         if (port_priv->device->process_mad) {
1665                 int ret;
1666
1667                 if (!response) {
1668                         printk(KERN_ERR PFX "No memory for response MAD\n");
1669                         /*
1670                          * Is it better to assume that
1671                          * it wouldn't be processed ?
1672                          */
1673                         goto out;
1674                 }
1675
1676                 ret = port_priv->device->process_mad(port_priv->device, 0,
1677                                                      port_priv->port_num,
1678                                                      wc, &recv->grh,
1679                                                      &recv->mad.mad,
1680                                                      &response->mad.mad);
1681                 if (ret & IB_MAD_RESULT_SUCCESS) {
1682                         if (ret & IB_MAD_RESULT_CONSUMED)
1683                                 goto out;
1684                         if (ret & IB_MAD_RESULT_REPLY) {
1685                                 agent_send_response(&response->mad.mad,
1686                                                     &recv->grh, wc,
1687                                                     port_priv->device,
1688                                                     port_priv->port_num,
1689                                                     qp_info->qp->qp_num);
1690                                 goto out;
1691                         }
1692                 }
1693         }
1694
1695         mad_agent = find_mad_agent(port_priv, &recv->mad.mad);
1696         if (mad_agent) {
1697                 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
1698                 /*
1699                  * recv is freed up in error cases in ib_mad_complete_recv
1700                  * or via recv_handler in ib_mad_complete_recv()
1701                  */
1702                 recv = NULL;
1703         }
1704
1705 out:
1706         /* Post another receive request for this QP */
1707         if (response) {
1708                 ib_mad_post_receive_mads(qp_info, response);
1709                 if (recv)
1710                         kmem_cache_free(ib_mad_cache, recv);
1711         } else
1712                 ib_mad_post_receive_mads(qp_info, recv);
1713 }
1714
1715 static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
1716 {
1717         struct ib_mad_send_wr_private *mad_send_wr;
1718         unsigned long delay;
1719
1720         if (list_empty(&mad_agent_priv->wait_list)) {
1721                 cancel_delayed_work(&mad_agent_priv->timed_work);
1722         } else {
1723                 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
1724                                          struct ib_mad_send_wr_private,
1725                                          agent_list);
1726
1727                 if (time_after(mad_agent_priv->timeout,
1728                                mad_send_wr->timeout)) {
1729                         mad_agent_priv->timeout = mad_send_wr->timeout;
1730                         cancel_delayed_work(&mad_agent_priv->timed_work);
1731                         delay = mad_send_wr->timeout - jiffies;
1732                         if ((long)delay <= 0)
1733                                 delay = 1;
1734                         queue_delayed_work(mad_agent_priv->qp_info->
1735                                            port_priv->wq,
1736                                            &mad_agent_priv->timed_work, delay);
1737                 }
1738         }
1739 }
1740
1741 static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
1742 {
1743         struct ib_mad_agent_private *mad_agent_priv;
1744         struct ib_mad_send_wr_private *temp_mad_send_wr;
1745         struct list_head *list_item;
1746         unsigned long delay;
1747
1748         mad_agent_priv = mad_send_wr->mad_agent_priv;
1749         list_del(&mad_send_wr->agent_list);
1750
1751         delay = mad_send_wr->timeout;
1752         mad_send_wr->timeout += jiffies;
1753
1754         if (delay) {
1755                 list_for_each_prev(list_item, &mad_agent_priv->wait_list) {
1756                         temp_mad_send_wr = list_entry(list_item,
1757                                                 struct ib_mad_send_wr_private,
1758                                                 agent_list);
1759                         if (time_after(mad_send_wr->timeout,
1760                                        temp_mad_send_wr->timeout))
1761                                 break;
1762                 }
1763         }
1764         else
1765                 list_item = &mad_agent_priv->wait_list;
1766         list_add(&mad_send_wr->agent_list, list_item);
1767
1768         /* Reschedule a work item if we have a shorter timeout */
1769         if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list) {
1770                 cancel_delayed_work(&mad_agent_priv->timed_work);
1771                 queue_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
1772                                    &mad_agent_priv->timed_work, delay);
1773         }
1774 }
1775
1776 void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr,
1777                           int timeout_ms)
1778 {
1779         mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
1780         wait_for_response(mad_send_wr);
1781 }
1782
1783 /*
1784  * Process a send work completion
1785  */
1786 void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
1787                              struct ib_mad_send_wc *mad_send_wc)
1788 {
1789         struct ib_mad_agent_private     *mad_agent_priv;
1790         unsigned long                   flags;
1791         int                             ret;
1792
1793         mad_agent_priv = mad_send_wr->mad_agent_priv;
1794         spin_lock_irqsave(&mad_agent_priv->lock, flags);
1795         if (mad_agent_priv->agent.rmpp_version) {
1796                 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc);
1797                 if (ret == IB_RMPP_RESULT_CONSUMED)
1798                         goto done;
1799         } else
1800                 ret = IB_RMPP_RESULT_UNHANDLED;
1801
1802         if (mad_send_wc->status != IB_WC_SUCCESS &&
1803             mad_send_wr->status == IB_WC_SUCCESS) {
1804                 mad_send_wr->status = mad_send_wc->status;
1805                 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
1806         }
1807
1808         if (--mad_send_wr->refcount > 0) {
1809                 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout &&
1810                     mad_send_wr->status == IB_WC_SUCCESS) {
1811                         wait_for_response(mad_send_wr);
1812                 }
1813                 goto done;
1814         }
1815
1816         /* Remove send from MAD agent and notify client of completion */
1817         list_del(&mad_send_wr->agent_list);
1818         adjust_timeout(mad_agent_priv);
1819         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1820
1821         if (mad_send_wr->status != IB_WC_SUCCESS )
1822                 mad_send_wc->status = mad_send_wr->status;
1823         if (ret == IB_RMPP_RESULT_INTERNAL)
1824                 ib_rmpp_send_handler(mad_send_wc);
1825         else
1826                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
1827                                                    mad_send_wc);
1828
1829         /* Release reference on agent taken when sending */
1830         if (atomic_dec_and_test(&mad_agent_priv->refcount))
1831                 wake_up(&mad_agent_priv->wait);
1832         return;
1833 done:
1834         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1835 }
1836
1837 static void ib_mad_send_done_handler(struct ib_mad_port_private *port_priv,
1838                                      struct ib_wc *wc)
1839 {
1840         struct ib_mad_send_wr_private   *mad_send_wr, *queued_send_wr;
1841         struct ib_mad_list_head         *mad_list;
1842         struct ib_mad_qp_info           *qp_info;
1843         struct ib_mad_queue             *send_queue;
1844         struct ib_send_wr               *bad_send_wr;
1845         struct ib_mad_send_wc           mad_send_wc;
1846         unsigned long flags;
1847         int ret;
1848
1849         mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
1850         mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
1851                                    mad_list);
1852         send_queue = mad_list->mad_queue;
1853         qp_info = send_queue->qp_info;
1854
1855 retry:
1856         dma_unmap_single(mad_send_wr->send_buf.mad_agent->device->dma_device,
1857                          pci_unmap_addr(mad_send_wr, mapping),
1858                          mad_send_wr->sg_list[0].length, DMA_TO_DEVICE);
1859         queued_send_wr = NULL;
1860         spin_lock_irqsave(&send_queue->lock, flags);
1861         list_del(&mad_list->list);
1862
1863         /* Move queued send to the send queue */
1864         if (send_queue->count-- > send_queue->max_active) {
1865                 mad_list = container_of(qp_info->overflow_list.next,
1866                                         struct ib_mad_list_head, list);
1867                 queued_send_wr = container_of(mad_list,
1868                                         struct ib_mad_send_wr_private,
1869                                         mad_list);
1870                 list_del(&mad_list->list);
1871                 list_add_tail(&mad_list->list, &send_queue->list);
1872         }
1873         spin_unlock_irqrestore(&send_queue->lock, flags);
1874
1875         mad_send_wc.send_buf = &mad_send_wr->send_buf;
1876         mad_send_wc.status = wc->status;
1877         mad_send_wc.vendor_err = wc->vendor_err;
1878         if (atomic_read(&qp_info->snoop_count))
1879                 snoop_send(qp_info, &mad_send_wr->send_buf, &mad_send_wc,
1880                            IB_MAD_SNOOP_SEND_COMPLETIONS);
1881         ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
1882
1883         if (queued_send_wr) {
1884                 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr,
1885                                    &bad_send_wr);
1886                 if (ret) {
1887                         printk(KERN_ERR PFX "ib_post_send failed: %d\n", ret);
1888                         mad_send_wr = queued_send_wr;
1889                         wc->status = IB_WC_LOC_QP_OP_ERR;
1890                         goto retry;
1891                 }
1892         }
1893 }
1894
1895 static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info)
1896 {
1897         struct ib_mad_send_wr_private *mad_send_wr;
1898         struct ib_mad_list_head *mad_list;
1899         unsigned long flags;
1900
1901         spin_lock_irqsave(&qp_info->send_queue.lock, flags);
1902         list_for_each_entry(mad_list, &qp_info->send_queue.list, list) {
1903                 mad_send_wr = container_of(mad_list,
1904                                            struct ib_mad_send_wr_private,
1905                                            mad_list);
1906                 mad_send_wr->retry = 1;
1907         }
1908         spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
1909 }
1910
1911 static void mad_error_handler(struct ib_mad_port_private *port_priv,
1912                               struct ib_wc *wc)
1913 {
1914         struct ib_mad_list_head *mad_list;
1915         struct ib_mad_qp_info *qp_info;
1916         struct ib_mad_send_wr_private *mad_send_wr;
1917         int ret;
1918
1919         /* Determine if failure was a send or receive */
1920         mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
1921         qp_info = mad_list->mad_queue->qp_info;
1922         if (mad_list->mad_queue == &qp_info->recv_queue)
1923                 /*
1924                  * Receive errors indicate that the QP has entered the error
1925                  * state - error handling/shutdown code will cleanup
1926                  */
1927                 return;
1928
1929         /*
1930          * Send errors will transition the QP to SQE - move
1931          * QP to RTS and repost flushed work requests
1932          */
1933         mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
1934                                    mad_list);
1935         if (wc->status == IB_WC_WR_FLUSH_ERR) {
1936                 if (mad_send_wr->retry) {
1937                         /* Repost send */
1938                         struct ib_send_wr *bad_send_wr;
1939
1940                         mad_send_wr->retry = 0;
1941                         ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr,
1942                                         &bad_send_wr);
1943                         if (ret)
1944                                 ib_mad_send_done_handler(port_priv, wc);
1945                 } else
1946                         ib_mad_send_done_handler(port_priv, wc);
1947         } else {
1948                 struct ib_qp_attr *attr;
1949
1950                 /* Transition QP to RTS and fail offending send */
1951                 attr = kmalloc(sizeof *attr, GFP_KERNEL);
1952                 if (attr) {
1953                         attr->qp_state = IB_QPS_RTS;
1954                         attr->cur_qp_state = IB_QPS_SQE;
1955                         ret = ib_modify_qp(qp_info->qp, attr,
1956                                            IB_QP_STATE | IB_QP_CUR_STATE);
1957                         kfree(attr);
1958                         if (ret)
1959                                 printk(KERN_ERR PFX "mad_error_handler - "
1960                                        "ib_modify_qp to RTS : %d\n", ret);
1961                         else
1962                                 mark_sends_for_retry(qp_info);
1963                 }
1964                 ib_mad_send_done_handler(port_priv, wc);
1965         }
1966 }
1967
1968 /*
1969  * IB MAD completion callback
1970  */
1971 static void ib_mad_completion_handler(void *data)
1972 {
1973         struct ib_mad_port_private *port_priv;
1974         struct ib_wc wc;
1975
1976         port_priv = (struct ib_mad_port_private *)data;
1977         ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
1978
1979         while (ib_poll_cq(port_priv->cq, 1, &wc) == 1) {
1980                 if (wc.status == IB_WC_SUCCESS) {
1981                         switch (wc.opcode) {
1982                         case IB_WC_SEND:
1983                                 ib_mad_send_done_handler(port_priv, &wc);
1984                                 break;
1985                         case IB_WC_RECV:
1986                                 ib_mad_recv_done_handler(port_priv, &wc);
1987                                 break;
1988                         default:
1989                                 BUG_ON(1);
1990                                 break;
1991                         }
1992                 } else
1993                         mad_error_handler(port_priv, &wc);
1994         }
1995 }
1996
1997 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
1998 {
1999         unsigned long flags;
2000         struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr;
2001         struct ib_mad_send_wc mad_send_wc;
2002         struct list_head cancel_list;
2003
2004         INIT_LIST_HEAD(&cancel_list);
2005
2006         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2007         list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2008                                  &mad_agent_priv->send_list, agent_list) {
2009                 if (mad_send_wr->status == IB_WC_SUCCESS) {
2010                         mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2011                         mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2012                 }
2013         }
2014
2015         /* Empty wait list to prevent receives from finding a request */
2016         list_splice_init(&mad_agent_priv->wait_list, &cancel_list);
2017         /* Empty local completion list as well */
2018         list_splice_init(&mad_agent_priv->local_list, &cancel_list);
2019         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2020
2021         /* Report all cancelled requests */
2022         mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
2023         mad_send_wc.vendor_err = 0;
2024
2025         list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2026                                  &cancel_list, agent_list) {
2027                 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2028                 list_del(&mad_send_wr->agent_list);
2029                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2030                                                    &mad_send_wc);
2031                 atomic_dec(&mad_agent_priv->refcount);
2032         }
2033 }
2034
2035 static struct ib_mad_send_wr_private*
2036 find_send_wr(struct ib_mad_agent_private *mad_agent_priv,
2037              struct ib_mad_send_buf *send_buf)
2038 {
2039         struct ib_mad_send_wr_private *mad_send_wr;
2040
2041         list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
2042                             agent_list) {
2043                 if (&mad_send_wr->send_buf == send_buf)
2044                         return mad_send_wr;
2045         }
2046
2047         list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
2048                             agent_list) {
2049                 if (is_data_mad(mad_agent_priv, mad_send_wr->send_buf.mad) &&
2050                     &mad_send_wr->send_buf == send_buf)
2051                         return mad_send_wr;
2052         }
2053         return NULL;
2054 }
2055
2056 int ib_modify_mad(struct ib_mad_agent *mad_agent,
2057                   struct ib_mad_send_buf *send_buf, u32 timeout_ms)
2058 {
2059         struct ib_mad_agent_private *mad_agent_priv;
2060         struct ib_mad_send_wr_private *mad_send_wr;
2061         unsigned long flags;
2062         int active;
2063
2064         mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
2065                                       agent);
2066         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2067         mad_send_wr = find_send_wr(mad_agent_priv, send_buf);
2068         if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) {
2069                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2070                 return -EINVAL;
2071         }
2072
2073         active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1);
2074         if (!timeout_ms) {
2075                 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2076                 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2077         }
2078
2079         mad_send_wr->send_buf.timeout_ms = timeout_ms;
2080         if (active)
2081                 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2082         else
2083                 ib_reset_mad_timeout(mad_send_wr, timeout_ms);
2084
2085         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2086         return 0;
2087 }
2088 EXPORT_SYMBOL(ib_modify_mad);
2089
2090 void ib_cancel_mad(struct ib_mad_agent *mad_agent,
2091                    struct ib_mad_send_buf *send_buf)
2092 {
2093         ib_modify_mad(mad_agent, send_buf, 0);
2094 }
2095 EXPORT_SYMBOL(ib_cancel_mad);
2096
2097 static void local_completions(void *data)
2098 {
2099         struct ib_mad_agent_private *mad_agent_priv;
2100         struct ib_mad_local_private *local;
2101         struct ib_mad_agent_private *recv_mad_agent;
2102         unsigned long flags;
2103         int recv = 0;
2104         struct ib_wc wc;
2105         struct ib_mad_send_wc mad_send_wc;
2106
2107         mad_agent_priv = (struct ib_mad_agent_private *)data;
2108
2109         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2110         while (!list_empty(&mad_agent_priv->local_list)) {
2111                 local = list_entry(mad_agent_priv->local_list.next,
2112                                    struct ib_mad_local_private,
2113                                    completion_list);
2114                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2115                 if (local->mad_priv) {
2116                         recv_mad_agent = local->recv_mad_agent;
2117                         if (!recv_mad_agent) {
2118                                 printk(KERN_ERR PFX "No receive MAD agent for local completion\n");
2119                                 goto local_send_completion;
2120                         }
2121
2122                         recv = 1;
2123                         /*
2124                          * Defined behavior is to complete response
2125                          * before request
2126                          */
2127                         build_smp_wc((unsigned long) local->mad_send_wr,
2128                                      be16_to_cpu(IB_LID_PERMISSIVE),
2129                                      0, recv_mad_agent->agent.port_num, &wc);
2130
2131                         local->mad_priv->header.recv_wc.wc = &wc;
2132                         local->mad_priv->header.recv_wc.mad_len =
2133                                                 sizeof(struct ib_mad);
2134                         INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list);
2135                         list_add(&local->mad_priv->header.recv_wc.recv_buf.list,
2136                                  &local->mad_priv->header.recv_wc.rmpp_list);
2137                         local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
2138                         local->mad_priv->header.recv_wc.recv_buf.mad =
2139                                                 &local->mad_priv->mad.mad;
2140                         if (atomic_read(&recv_mad_agent->qp_info->snoop_count))
2141                                 snoop_recv(recv_mad_agent->qp_info,
2142                                           &local->mad_priv->header.recv_wc,
2143                                            IB_MAD_SNOOP_RECVS);
2144                         recv_mad_agent->agent.recv_handler(
2145                                                 &recv_mad_agent->agent,
2146                                                 &local->mad_priv->header.recv_wc);
2147                         spin_lock_irqsave(&recv_mad_agent->lock, flags);
2148                         atomic_dec(&recv_mad_agent->refcount);
2149                         spin_unlock_irqrestore(&recv_mad_agent->lock, flags);
2150                 }
2151
2152 local_send_completion:
2153                 /* Complete send */
2154                 mad_send_wc.status = IB_WC_SUCCESS;
2155                 mad_send_wc.vendor_err = 0;
2156                 mad_send_wc.send_buf = &local->mad_send_wr->send_buf;
2157                 if (atomic_read(&mad_agent_priv->qp_info->snoop_count))
2158                         snoop_send(mad_agent_priv->qp_info,
2159                                    &local->mad_send_wr->send_buf,
2160                                    &mad_send_wc, IB_MAD_SNOOP_SEND_COMPLETIONS);
2161                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2162                                                    &mad_send_wc);
2163
2164                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2165                 list_del(&local->completion_list);
2166                 atomic_dec(&mad_agent_priv->refcount);
2167                 if (!recv)
2168                         kmem_cache_free(ib_mad_cache, local->mad_priv);
2169                 kfree(local);
2170         }
2171         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2172 }
2173
2174 static int retry_send(struct ib_mad_send_wr_private *mad_send_wr)
2175 {
2176         int ret;
2177
2178         if (!mad_send_wr->retries--)
2179                 return -ETIMEDOUT;
2180
2181         mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
2182
2183         if (mad_send_wr->mad_agent_priv->agent.rmpp_version) {
2184                 ret = ib_retry_rmpp(mad_send_wr);
2185                 switch (ret) {
2186                 case IB_RMPP_RESULT_UNHANDLED:
2187                         ret = ib_send_mad(mad_send_wr);
2188                         break;
2189                 case IB_RMPP_RESULT_CONSUMED:
2190                         ret = 0;
2191                         break;
2192                 default:
2193                         ret = -ECOMM;
2194                         break;
2195                 }
2196         } else
2197                 ret = ib_send_mad(mad_send_wr);
2198
2199         if (!ret) {
2200                 mad_send_wr->refcount++;
2201                 list_add_tail(&mad_send_wr->agent_list,
2202                               &mad_send_wr->mad_agent_priv->send_list);
2203         }
2204         return ret;
2205 }
2206
2207 static void timeout_sends(void *data)
2208 {
2209         struct ib_mad_agent_private *mad_agent_priv;
2210         struct ib_mad_send_wr_private *mad_send_wr;
2211         struct ib_mad_send_wc mad_send_wc;
2212         unsigned long flags, delay;
2213
2214         mad_agent_priv = (struct ib_mad_agent_private *)data;
2215         mad_send_wc.vendor_err = 0;
2216
2217         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2218         while (!list_empty(&mad_agent_priv->wait_list)) {
2219                 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2220                                          struct ib_mad_send_wr_private,
2221                                          agent_list);
2222
2223                 if (time_after(mad_send_wr->timeout, jiffies)) {
2224                         delay = mad_send_wr->timeout - jiffies;
2225                         if ((long)delay <= 0)
2226                                 delay = 1;
2227                         queue_delayed_work(mad_agent_priv->qp_info->
2228                                            port_priv->wq,
2229                                            &mad_agent_priv->timed_work, delay);
2230                         break;
2231                 }
2232
2233                 list_del(&mad_send_wr->agent_list);
2234                 if (mad_send_wr->status == IB_WC_SUCCESS &&
2235                     !retry_send(mad_send_wr))
2236                         continue;
2237
2238                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2239
2240                 if (mad_send_wr->status == IB_WC_SUCCESS)
2241                         mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR;
2242                 else
2243                         mad_send_wc.status = mad_send_wr->status;
2244                 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2245                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2246                                                    &mad_send_wc);
2247
2248                 atomic_dec(&mad_agent_priv->refcount);
2249                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2250         }
2251         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2252 }
2253
2254 static void ib_mad_thread_completion_handler(struct ib_cq *cq, void *arg)
2255 {
2256         struct ib_mad_port_private *port_priv = cq->cq_context;
2257
2258         queue_work(port_priv->wq, &port_priv->work);
2259 }
2260
2261 /*
2262  * Allocate receive MADs and post receive WRs for them
2263  */
2264 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
2265                                     struct ib_mad_private *mad)
2266 {
2267         unsigned long flags;
2268         int post, ret;
2269         struct ib_mad_private *mad_priv;
2270         struct ib_sge sg_list;
2271         struct ib_recv_wr recv_wr, *bad_recv_wr;
2272         struct ib_mad_queue *recv_queue = &qp_info->recv_queue;
2273
2274         /* Initialize common scatter list fields */
2275         sg_list.length = sizeof *mad_priv - sizeof mad_priv->header;
2276         sg_list.lkey = (*qp_info->port_priv->mr).lkey;
2277
2278         /* Initialize common receive WR fields */
2279         recv_wr.next = NULL;
2280         recv_wr.sg_list = &sg_list;
2281         recv_wr.num_sge = 1;
2282
2283         do {
2284                 /* Allocate and map receive buffer */
2285                 if (mad) {
2286                         mad_priv = mad;
2287                         mad = NULL;
2288                 } else {
2289                         mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
2290                         if (!mad_priv) {
2291                                 printk(KERN_ERR PFX "No memory for receive buffer\n");
2292                                 ret = -ENOMEM;
2293                                 break;
2294                         }
2295                 }
2296                 sg_list.addr = dma_map_single(qp_info->port_priv->
2297                                                 device->dma_device,
2298                                         &mad_priv->grh,
2299                                         sizeof *mad_priv -
2300                                                 sizeof mad_priv->header,
2301                                         DMA_FROM_DEVICE);
2302                 pci_unmap_addr_set(&mad_priv->header, mapping, sg_list.addr);
2303                 recv_wr.wr_id = (unsigned long)&mad_priv->header.mad_list;
2304                 mad_priv->header.mad_list.mad_queue = recv_queue;
2305
2306                 /* Post receive WR */
2307                 spin_lock_irqsave(&recv_queue->lock, flags);
2308                 post = (++recv_queue->count < recv_queue->max_active);
2309                 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list);
2310                 spin_unlock_irqrestore(&recv_queue->lock, flags);
2311                 ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr);
2312                 if (ret) {
2313                         spin_lock_irqsave(&recv_queue->lock, flags);
2314                         list_del(&mad_priv->header.mad_list.list);
2315                         recv_queue->count--;
2316                         spin_unlock_irqrestore(&recv_queue->lock, flags);
2317                         dma_unmap_single(qp_info->port_priv->device->dma_device,
2318                                          pci_unmap_addr(&mad_priv->header,
2319                                                         mapping),
2320                                          sizeof *mad_priv -
2321                                            sizeof mad_priv->header,
2322                                          DMA_FROM_DEVICE);
2323                         kmem_cache_free(ib_mad_cache, mad_priv);
2324                         printk(KERN_ERR PFX "ib_post_recv failed: %d\n", ret);
2325                         break;
2326                 }
2327         } while (post);
2328
2329         return ret;
2330 }
2331
2332 /*
2333  * Return all the posted receive MADs
2334  */
2335 static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info)
2336 {
2337         struct ib_mad_private_header *mad_priv_hdr;
2338         struct ib_mad_private *recv;
2339         struct ib_mad_list_head *mad_list;
2340
2341         while (!list_empty(&qp_info->recv_queue.list)) {
2342
2343                 mad_list = list_entry(qp_info->recv_queue.list.next,
2344                                       struct ib_mad_list_head, list);
2345                 mad_priv_hdr = container_of(mad_list,
2346                                             struct ib_mad_private_header,
2347                                             mad_list);
2348                 recv = container_of(mad_priv_hdr, struct ib_mad_private,
2349                                     header);
2350
2351                 /* Remove from posted receive MAD list */
2352                 list_del(&mad_list->list);
2353
2354                 dma_unmap_single(qp_info->port_priv->device->dma_device,
2355                                  pci_unmap_addr(&recv->header, mapping),
2356                                  sizeof(struct ib_mad_private) -
2357                                  sizeof(struct ib_mad_private_header),
2358                                  DMA_FROM_DEVICE);
2359                 kmem_cache_free(ib_mad_cache, recv);
2360         }
2361
2362         qp_info->recv_queue.count = 0;
2363 }
2364
2365 /*
2366  * Start the port
2367  */
2368 static int ib_mad_port_start(struct ib_mad_port_private *port_priv)
2369 {
2370         int ret, i;
2371         struct ib_qp_attr *attr;
2372         struct ib_qp *qp;
2373
2374         attr = kmalloc(sizeof *attr, GFP_KERNEL);
2375         if (!attr) {
2376                 printk(KERN_ERR PFX "Couldn't kmalloc ib_qp_attr\n");
2377                 return -ENOMEM;
2378         }
2379
2380         for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2381                 qp = port_priv->qp_info[i].qp;
2382                 /*
2383                  * PKey index for QP1 is irrelevant but
2384                  * one is needed for the Reset to Init transition
2385                  */
2386                 attr->qp_state = IB_QPS_INIT;
2387                 attr->pkey_index = 0;
2388                 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY;
2389                 ret = ib_modify_qp(qp, attr, IB_QP_STATE |
2390                                              IB_QP_PKEY_INDEX | IB_QP_QKEY);
2391                 if (ret) {
2392                         printk(KERN_ERR PFX "Couldn't change QP%d state to "
2393                                "INIT: %d\n", i, ret);
2394                         goto out;
2395                 }
2396
2397                 attr->qp_state = IB_QPS_RTR;
2398                 ret = ib_modify_qp(qp, attr, IB_QP_STATE);
2399                 if (ret) {
2400                         printk(KERN_ERR PFX "Couldn't change QP%d state to "
2401                                "RTR: %d\n", i, ret);
2402                         goto out;
2403                 }
2404
2405                 attr->qp_state = IB_QPS_RTS;
2406                 attr->sq_psn = IB_MAD_SEND_Q_PSN;
2407                 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN);
2408                 if (ret) {
2409                         printk(KERN_ERR PFX "Couldn't change QP%d state to "
2410                                "RTS: %d\n", i, ret);
2411                         goto out;
2412                 }
2413         }
2414
2415         ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2416         if (ret) {
2417                 printk(KERN_ERR PFX "Failed to request completion "
2418                        "notification: %d\n", ret);
2419                 goto out;
2420         }
2421
2422         for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2423                 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
2424                 if (ret) {
2425                         printk(KERN_ERR PFX "Couldn't post receive WRs\n");
2426                         goto out;
2427                 }
2428         }
2429 out:
2430         kfree(attr);
2431         return ret;
2432 }
2433
2434 static void qp_event_handler(struct ib_event *event, void *qp_context)
2435 {
2436         struct ib_mad_qp_info   *qp_info = qp_context;
2437
2438         /* It's worse than that! He's dead, Jim! */
2439         printk(KERN_ERR PFX "Fatal error (%d) on MAD QP (%d)\n",
2440                 event->event, qp_info->qp->qp_num);
2441 }
2442
2443 static void init_mad_queue(struct ib_mad_qp_info *qp_info,
2444                            struct ib_mad_queue *mad_queue)
2445 {
2446         mad_queue->qp_info = qp_info;
2447         mad_queue->count = 0;
2448         spin_lock_init(&mad_queue->lock);
2449         INIT_LIST_HEAD(&mad_queue->list);
2450 }
2451
2452 static void init_mad_qp(struct ib_mad_port_private *port_priv,
2453                         struct ib_mad_qp_info *qp_info)
2454 {
2455         qp_info->port_priv = port_priv;
2456         init_mad_queue(qp_info, &qp_info->send_queue);
2457         init_mad_queue(qp_info, &qp_info->recv_queue);
2458         INIT_LIST_HEAD(&qp_info->overflow_list);
2459         spin_lock_init(&qp_info->snoop_lock);
2460         qp_info->snoop_table = NULL;
2461         qp_info->snoop_table_size = 0;
2462         atomic_set(&qp_info->snoop_count, 0);
2463 }
2464
2465 static int create_mad_qp(struct ib_mad_qp_info *qp_info,
2466                          enum ib_qp_type qp_type)
2467 {
2468         struct ib_qp_init_attr  qp_init_attr;
2469         int ret;
2470
2471         memset(&qp_init_attr, 0, sizeof qp_init_attr);
2472         qp_init_attr.send_cq = qp_info->port_priv->cq;
2473         qp_init_attr.recv_cq = qp_info->port_priv->cq;
2474         qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
2475         qp_init_attr.cap.max_send_wr = IB_MAD_QP_SEND_SIZE;
2476         qp_init_attr.cap.max_recv_wr = IB_MAD_QP_RECV_SIZE;
2477         qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG;
2478         qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG;
2479         qp_init_attr.qp_type = qp_type;
2480         qp_init_attr.port_num = qp_info->port_priv->port_num;
2481         qp_init_attr.qp_context = qp_info;
2482         qp_init_attr.event_handler = qp_event_handler;
2483         qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr);
2484         if (IS_ERR(qp_info->qp)) {
2485                 printk(KERN_ERR PFX "Couldn't create ib_mad QP%d\n",
2486                        get_spl_qp_index(qp_type));
2487                 ret = PTR_ERR(qp_info->qp);
2488                 goto error;
2489         }
2490         /* Use minimum queue sizes unless the CQ is resized */
2491         qp_info->send_queue.max_active = IB_MAD_QP_SEND_SIZE;
2492         qp_info->recv_queue.max_active = IB_MAD_QP_RECV_SIZE;
2493         return 0;
2494
2495 error:
2496         return ret;
2497 }
2498
2499 static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
2500 {
2501         ib_destroy_qp(qp_info->qp);
2502         kfree(qp_info->snoop_table);
2503 }
2504
2505 /*
2506  * Open the port
2507  * Create the QP, PD, MR, and CQ if needed
2508  */
2509 static int ib_mad_port_open(struct ib_device *device,
2510                             int port_num)
2511 {
2512         int ret, cq_size;
2513         struct ib_mad_port_private *port_priv;
2514         unsigned long flags;
2515         char name[sizeof "ib_mad123"];
2516
2517         /* Create new device info */
2518         port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
2519         if (!port_priv) {
2520                 printk(KERN_ERR PFX "No memory for ib_mad_port_private\n");
2521                 return -ENOMEM;
2522         }
2523
2524         port_priv->device = device;
2525         port_priv->port_num = port_num;
2526         spin_lock_init(&port_priv->reg_lock);
2527         INIT_LIST_HEAD(&port_priv->agent_list);
2528         init_mad_qp(port_priv, &port_priv->qp_info[0]);
2529         init_mad_qp(port_priv, &port_priv->qp_info[1]);
2530
2531         cq_size = (IB_MAD_QP_SEND_SIZE + IB_MAD_QP_RECV_SIZE) * 2;
2532         port_priv->cq = ib_create_cq(port_priv->device,
2533                                      ib_mad_thread_completion_handler,
2534                                      NULL, port_priv, cq_size);
2535         if (IS_ERR(port_priv->cq)) {
2536                 printk(KERN_ERR PFX "Couldn't create ib_mad CQ\n");
2537                 ret = PTR_ERR(port_priv->cq);
2538                 goto error3;
2539         }
2540
2541         port_priv->pd = ib_alloc_pd(device);
2542         if (IS_ERR(port_priv->pd)) {
2543                 printk(KERN_ERR PFX "Couldn't create ib_mad PD\n");
2544                 ret = PTR_ERR(port_priv->pd);
2545                 goto error4;
2546         }
2547
2548         port_priv->mr = ib_get_dma_mr(port_priv->pd, IB_ACCESS_LOCAL_WRITE);
2549         if (IS_ERR(port_priv->mr)) {
2550                 printk(KERN_ERR PFX "Couldn't get ib_mad DMA MR\n");
2551                 ret = PTR_ERR(port_priv->mr);
2552                 goto error5;
2553         }
2554
2555         ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
2556         if (ret)
2557                 goto error6;
2558         ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI);
2559         if (ret)
2560                 goto error7;
2561
2562         snprintf(name, sizeof name, "ib_mad%d", port_num);
2563         port_priv->wq = create_singlethread_workqueue(name);
2564         if (!port_priv->wq) {
2565                 ret = -ENOMEM;
2566                 goto error8;
2567         }
2568         INIT_WORK(&port_priv->work, ib_mad_completion_handler, port_priv);
2569
2570         ret = ib_mad_port_start(port_priv);
2571         if (ret) {
2572                 printk(KERN_ERR PFX "Couldn't start port\n");
2573                 goto error9;
2574         }
2575
2576         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2577         list_add_tail(&port_priv->port_list, &ib_mad_port_list);
2578         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2579         return 0;
2580
2581 error9:
2582         destroy_workqueue(port_priv->wq);
2583 error8:
2584         destroy_mad_qp(&port_priv->qp_info[1]);
2585 error7:
2586         destroy_mad_qp(&port_priv->qp_info[0]);
2587 error6:
2588         ib_dereg_mr(port_priv->mr);
2589 error5:
2590         ib_dealloc_pd(port_priv->pd);
2591 error4:
2592         ib_destroy_cq(port_priv->cq);
2593         cleanup_recv_queue(&port_priv->qp_info[1]);
2594         cleanup_recv_queue(&port_priv->qp_info[0]);
2595 error3:
2596         kfree(port_priv);
2597
2598         return ret;
2599 }
2600
2601 /*
2602  * Close the port
2603  * If there are no classes using the port, free the port
2604  * resources (CQ, MR, PD, QP) and remove the port's info structure
2605  */
2606 static int ib_mad_port_close(struct ib_device *device, int port_num)
2607 {
2608         struct ib_mad_port_private *port_priv;
2609         unsigned long flags;
2610
2611         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2612         port_priv = __ib_get_mad_port(device, port_num);
2613         if (port_priv == NULL) {
2614                 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2615                 printk(KERN_ERR PFX "Port %d not found\n", port_num);
2616                 return -ENODEV;
2617         }
2618         list_del(&port_priv->port_list);
2619         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2620
2621         /* Stop processing completions. */
2622         flush_workqueue(port_priv->wq);
2623         destroy_workqueue(port_priv->wq);
2624         destroy_mad_qp(&port_priv->qp_info[1]);
2625         destroy_mad_qp(&port_priv->qp_info[0]);
2626         ib_dereg_mr(port_priv->mr);
2627         ib_dealloc_pd(port_priv->pd);
2628         ib_destroy_cq(port_priv->cq);
2629         cleanup_recv_queue(&port_priv->qp_info[1]);
2630         cleanup_recv_queue(&port_priv->qp_info[0]);
2631         /* XXX: Handle deallocation of MAD registration tables */
2632
2633         kfree(port_priv);
2634
2635         return 0;
2636 }
2637
2638 static void ib_mad_init_device(struct ib_device *device)
2639 {
2640         int start, end, i;
2641
2642         if (device->node_type == IB_NODE_SWITCH) {
2643                 start = 0;
2644                 end   = 0;
2645         } else {
2646                 start = 1;
2647                 end   = device->phys_port_cnt;
2648         }
2649
2650         for (i = start; i <= end; i++) {
2651                 if (ib_mad_port_open(device, i)) {
2652                         printk(KERN_ERR PFX "Couldn't open %s port %d\n",
2653                                device->name, i);
2654                         goto error;
2655                 }
2656                 if (ib_agent_port_open(device, i)) {
2657                         printk(KERN_ERR PFX "Couldn't open %s port %d "
2658                                "for agents\n",
2659                                device->name, i);
2660                         goto error_agent;
2661                 }
2662         }
2663         return;
2664
2665 error_agent:
2666         if (ib_mad_port_close(device, i))
2667                 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2668                        device->name, i);
2669
2670 error:
2671         i--;
2672
2673         while (i >= start) {
2674                 if (ib_agent_port_close(device, i))
2675                         printk(KERN_ERR PFX "Couldn't close %s port %d "
2676                                "for agents\n",
2677                                device->name, i);
2678                 if (ib_mad_port_close(device, i))
2679                         printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2680                                device->name, i);
2681                 i--;
2682         }
2683 }
2684
2685 static void ib_mad_remove_device(struct ib_device *device)
2686 {
2687         int i, num_ports, cur_port;
2688
2689         if (device->node_type == IB_NODE_SWITCH) {
2690                 num_ports = 1;
2691                 cur_port = 0;
2692         } else {
2693                 num_ports = device->phys_port_cnt;
2694                 cur_port = 1;
2695         }
2696         for (i = 0; i < num_ports; i++, cur_port++) {
2697                 if (ib_agent_port_close(device, cur_port))
2698                         printk(KERN_ERR PFX "Couldn't close %s port %d "
2699                                "for agents\n",
2700                                device->name, cur_port);
2701                 if (ib_mad_port_close(device, cur_port))
2702                         printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2703                                device->name, cur_port);
2704         }
2705 }
2706
2707 static struct ib_client mad_client = {
2708         .name   = "mad",
2709         .add = ib_mad_init_device,
2710         .remove = ib_mad_remove_device
2711 };
2712
2713 static int __init ib_mad_init_module(void)
2714 {
2715         int ret;
2716
2717         spin_lock_init(&ib_mad_port_list_lock);
2718
2719         ib_mad_cache = kmem_cache_create("ib_mad",
2720                                          sizeof(struct ib_mad_private),
2721                                          0,
2722                                          SLAB_HWCACHE_ALIGN,
2723                                          NULL,
2724                                          NULL);
2725         if (!ib_mad_cache) {
2726                 printk(KERN_ERR PFX "Couldn't create ib_mad cache\n");
2727                 ret = -ENOMEM;
2728                 goto error1;
2729         }
2730
2731         INIT_LIST_HEAD(&ib_mad_port_list);
2732
2733         if (ib_register_client(&mad_client)) {
2734                 printk(KERN_ERR PFX "Couldn't register ib_mad client\n");
2735                 ret = -EINVAL;
2736                 goto error2;
2737         }
2738
2739         return 0;
2740
2741 error2:
2742         kmem_cache_destroy(ib_mad_cache);
2743 error1:
2744         return ret;
2745 }
2746
2747 static void __exit ib_mad_cleanup_module(void)
2748 {
2749         ib_unregister_client(&mad_client);
2750
2751         if (kmem_cache_destroy(ib_mad_cache)) {
2752                 printk(KERN_DEBUG PFX "Failed to destroy ib_mad cache\n");
2753         }
2754 }
2755
2756 module_init(ib_mad_init_module);
2757 module_exit(ib_mad_cleanup_module);
2758