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 = kmalloc(sizeof *mad_agent_priv, GFP_KERNEL);
 259         if (!mad_agent_priv) {
 260                 ret = ERR_PTR(-ENOMEM);
 261                 goto error1;
 262         }
 263         memset(mad_agent_priv, 0, sizeof *mad_agent_priv);
 264
 265         mad_agent_priv->agent.mr = ib_get_dma_mr(port_priv->qp_info[qpn].qp->pd,
 266                                                  IB_ACCESS_LOCAL_WRITE);
 267         if (IS_ERR(mad_agent_priv->agent.mr)) {
 268                 ret = ERR_PTR(-ENOMEM);
 269                 goto error2;
 270         }
 271
 272         if (mad_reg_req) {
 273                 reg_req = kmalloc(sizeof *reg_req, GFP_KERNEL);
 274                 if (!reg_req) {
 275                         ret = ERR_PTR(-ENOMEM);
 276                         goto error3;
 277                 }
 278                 /* Make a copy of the MAD registration request */
 279                 memcpy(reg_req, mad_reg_req, sizeof *reg_req);
 280         }
 281
 282         /* Now, fill in the various structures */
 283         mad_agent_priv->qp_info = &port_priv->qp_info[qpn];
 284         mad_agent_priv->reg_req = reg_req;
 285         mad_agent_priv->agent.rmpp_version = rmpp_version;
 286         mad_agent_priv->agent.device = device;
 287         mad_agent_priv->agent.recv_handler = recv_handler;
 288         mad_agent_priv->agent.send_handler = send_handler;
 289         mad_agent_priv->agent.context = context;
 290         mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp;
 291         mad_agent_priv->agent.port_num = port_num;
 292
 293         spin_lock_irqsave(&port_priv->reg_lock, flags);
 294         mad_agent_priv->agent.hi_tid = ++ib_mad_client_id;
 295
 296         /*
 297          * Make sure MAD registration (if supplied)
 298          * is non overlapping with any existing ones
 299          */
 300         if (mad_reg_req) {
 301                 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class);
 302                 if (!is_vendor_class(mgmt_class)) {
 303                         class = port_priv->version[mad_reg_req->
 304                                                    mgmt_class_version].class;
 305                         if (class) {
 306                                 method = class->method_table[mgmt_class];
 307                                 if (method) {
 308                                         if (method_in_use(&method,
 309                                                            mad_reg_req))
 310                                                 goto error4;
 311                                 }
 312                         }
 313                         ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv,
 314                                                   mgmt_class);
 315                 } else {
 316                         /* "New" vendor class range */
 317                         vendor = port_priv->version[mad_reg_req->
 318                                                     mgmt_class_version].vendor;
 319                         if (vendor) {
 320                                 vclass = vendor_class_index(mgmt_class);
 321                                 vendor_class = vendor->vendor_class[vclass];
 322                                 if (vendor_class) {
 323                                         if (is_vendor_method_in_use(
 324                                                         vendor_class,
 325                                                         mad_reg_req))
 326                                                 goto error4;
 327                                 }
 328                         }
 329                         ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv);
 330                 }
 331                 if (ret2) {
 332                         ret = ERR_PTR(ret2);
 333                         goto error4;
 334                 }
 335         }
 336
 337         /* Add mad agent into port's agent list */
 338         list_add_tail(&mad_agent_priv->agent_list, &port_priv->agent_list);
 339         spin_unlock_irqrestore(&port_priv->reg_lock, flags);
 340
 341         spin_lock_init(&mad_agent_priv->lock);
 342         INIT_LIST_HEAD(&mad_agent_priv->send_list);
 343         INIT_LIST_HEAD(&mad_agent_priv->wait_list);
 344         INIT_LIST_HEAD(&mad_agent_priv->done_list);
 345         INIT_LIST_HEAD(&mad_agent_priv->rmpp_list);
 346         INIT_WORK(&mad_agent_priv->timed_work, timeout_sends, mad_agent_priv);
 347         INIT_LIST_HEAD(&mad_agent_priv->local_list);
 348         INIT_WORK(&mad_agent_priv->local_work, local_completions,
 349                    mad_agent_priv);
 350         atomic_set(&mad_agent_priv->refcount, 1);
 351         init_waitqueue_head(&mad_agent_priv->wait);
 352
 353         return &mad_agent_priv->agent;
 354
 355 error4:
 356         spin_unlock_irqrestore(&port_priv->reg_lock, flags);
 357         kfree(reg_req);
 358 error3:
 359         kfree(mad_agent_priv);
 360 error2:
 361         ib_dereg_mr(mad_agent_priv->agent.mr);
 362 error1:
 363         return ret;
 364 }
 365 EXPORT_SYMBOL(ib_register_mad_agent);
 366
 367 static inline int is_snooping_sends(int mad_snoop_flags)
 368 {
 369         return (mad_snoop_flags &
 370                 (/*IB_MAD_SNOOP_POSTED_SENDS |
 371                  IB_MAD_SNOOP_RMPP_SENDS |*/
 372                  IB_MAD_SNOOP_SEND_COMPLETIONS /*|
 373                  IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS*/));
 374 }
 375
 376 static inline int is_snooping_recvs(int mad_snoop_flags)
 377 {
 378         return (mad_snoop_flags &
 379                 (IB_MAD_SNOOP_RECVS /*|
 380                  IB_MAD_SNOOP_RMPP_RECVS*/));
 381 }
 382
 383 static int register_snoop_agent(struct ib_mad_qp_info *qp_info,
 384                                 struct ib_mad_snoop_private *mad_snoop_priv)
 385 {
 386         struct ib_mad_snoop_private **new_snoop_table;
 387         unsigned long flags;
 388         int i;
 389
 390         spin_lock_irqsave(&qp_info->snoop_lock, flags);
 391         /* Check for empty slot in array. */
 392         for (i = 0; i < qp_info->snoop_table_size; i++)
 393                 if (!qp_info->snoop_table[i])
 394                         break;
 395
 396         if (i == qp_info->snoop_table_size) {
 397                 /* Grow table. */
 398                 new_snoop_table = kmalloc(sizeof mad_snoop_priv *
 399                                           qp_info->snoop_table_size + 1,
 400                                           GFP_ATOMIC);
 401                 if (!new_snoop_table) {
 402                         i = -ENOMEM;
 403                         goto out;
 404                 }
 405                 if (qp_info->snoop_table) {
 406                         memcpy(new_snoop_table, qp_info->snoop_table,
 407                                sizeof mad_snoop_priv *
 408                                qp_info->snoop_table_size);
 409                         kfree(qp_info->snoop_table);
 410                 }
 411                 qp_info->snoop_table = new_snoop_table;
 412                 qp_info->snoop_table_size++;
 413         }
 414         qp_info->snoop_table[i] = mad_snoop_priv;
 415         atomic_inc(&qp_info->snoop_count);
 416 out:
 417         spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 418         return i;
 419 }
 420
 421 struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device,
 422                                            u8 port_num,
 423                                            enum ib_qp_type qp_type,
 424                                            int mad_snoop_flags,
 425                                            ib_mad_snoop_handler snoop_handler,
 426                                            ib_mad_recv_handler recv_handler,
 427                                            void *context)
 428 {
 429         struct ib_mad_port_private *port_priv;
 430         struct ib_mad_agent *ret;
 431         struct ib_mad_snoop_private *mad_snoop_priv;
 432         int qpn;
 433
 434         /* Validate parameters */
 435         if ((is_snooping_sends(mad_snoop_flags) && !snoop_handler) ||
 436             (is_snooping_recvs(mad_snoop_flags) && !recv_handler)) {
 437                 ret = ERR_PTR(-EINVAL);
 438                 goto error1;
 439         }
 440         qpn = get_spl_qp_index(qp_type);
 441         if (qpn == -1) {
 442                 ret = ERR_PTR(-EINVAL);
 443                 goto error1;
 444         }
 445         port_priv = ib_get_mad_port(device, port_num);
 446         if (!port_priv) {
 447                 ret = ERR_PTR(-ENODEV);
 448                 goto error1;
 449         }
 450         /* Allocate structures */
 451         mad_snoop_priv = kmalloc(sizeof *mad_snoop_priv, GFP_KERNEL);
 452         if (!mad_snoop_priv) {
 453                 ret = ERR_PTR(-ENOMEM);
 454                 goto error1;
 455         }
 456
 457         /* Now, fill in the various structures */
 458         memset(mad_snoop_priv, 0, sizeof *mad_snoop_priv);
 459         mad_snoop_priv->qp_info = &port_priv->qp_info[qpn];
 460         mad_snoop_priv->agent.device = device;
 461         mad_snoop_priv->agent.recv_handler = recv_handler;
 462         mad_snoop_priv->agent.snoop_handler = snoop_handler;
 463         mad_snoop_priv->agent.context = context;
 464         mad_snoop_priv->agent.qp = port_priv->qp_info[qpn].qp;
 465         mad_snoop_priv->agent.port_num = port_num;
 466         mad_snoop_priv->mad_snoop_flags = mad_snoop_flags;
 467         init_waitqueue_head(&mad_snoop_priv->wait);
 468         mad_snoop_priv->snoop_index = register_snoop_agent(
 469                                                 &port_priv->qp_info[qpn],
 470                                                 mad_snoop_priv);
 471         if (mad_snoop_priv->snoop_index < 0) {
 472                 ret = ERR_PTR(mad_snoop_priv->snoop_index);
 473                 goto error2;
 474         }
 475
 476         atomic_set(&mad_snoop_priv->refcount, 1);
 477         return &mad_snoop_priv->agent;
 478
 479 error2:
 480         kfree(mad_snoop_priv);
 481 error1:
 482         return ret;
 483 }
 484 EXPORT_SYMBOL(ib_register_mad_snoop);
 485
 486 static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
 487 {
 488         struct ib_mad_port_private *port_priv;
 489         unsigned long flags;
 490
 491         /* Note that we could still be handling received MADs */
 492
 493         /*
 494          * Canceling all sends results in dropping received response
 495          * MADs, preventing us from queuing additional work
 496          */
 497         cancel_mads(mad_agent_priv);
 498         port_priv = mad_agent_priv->qp_info->port_priv;
 499         cancel_delayed_work(&mad_agent_priv->timed_work);
 500
 501         spin_lock_irqsave(&port_priv->reg_lock, flags);
 502         remove_mad_reg_req(mad_agent_priv);
 503         list_del(&mad_agent_priv->agent_list);
 504         spin_unlock_irqrestore(&port_priv->reg_lock, flags);
 505
 506         flush_workqueue(port_priv->wq);
 507         ib_cancel_rmpp_recvs(mad_agent_priv);
 508
 509         atomic_dec(&mad_agent_priv->refcount);
 510         wait_event(mad_agent_priv->wait,
 511                    !atomic_read(&mad_agent_priv->refcount));
 512
 513         if (mad_agent_priv->reg_req)
 514                 kfree(mad_agent_priv->reg_req);
 515         ib_dereg_mr(mad_agent_priv->agent.mr);
 516         kfree(mad_agent_priv);
 517 }
 518
 519 static void unregister_mad_snoop(struct ib_mad_snoop_private *mad_snoop_priv)
 520 {
 521         struct ib_mad_qp_info *qp_info;
 522         unsigned long flags;
 523
 524         qp_info = mad_snoop_priv->qp_info;
 525         spin_lock_irqsave(&qp_info->snoop_lock, flags);
 526         qp_info->snoop_table[mad_snoop_priv->snoop_index] = NULL;
 527         atomic_dec(&qp_info->snoop_count);
 528         spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 529
 530         atomic_dec(&mad_snoop_priv->refcount);
 531         wait_event(mad_snoop_priv->wait,
 532                    !atomic_read(&mad_snoop_priv->refcount));
 533
 534         kfree(mad_snoop_priv);
 535 }
 536
 537 /*
 538  * ib_unregister_mad_agent - Unregisters a client from using MAD services
 539  */
 540 int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent)
 541 {
 542         struct ib_mad_agent_private *mad_agent_priv;
 543         struct ib_mad_snoop_private *mad_snoop_priv;
 544
 545         /* If the TID is zero, the agent can only snoop. */
 546         if (mad_agent->hi_tid) {
 547                 mad_agent_priv = container_of(mad_agent,
 548                                               struct ib_mad_agent_private,
 549                                               agent);
 550                 unregister_mad_agent(mad_agent_priv);
 551         } else {
 552                 mad_snoop_priv = container_of(mad_agent,
 553                                               struct ib_mad_snoop_private,
 554                                               agent);
 555                 unregister_mad_snoop(mad_snoop_priv);
 556         }
 557         return 0;
 558 }
 559 EXPORT_SYMBOL(ib_unregister_mad_agent);
 560
 561 static inline int response_mad(struct ib_mad *mad)
 562 {
 563         /* Trap represses are responses although response bit is reset */
 564         return ((mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS) ||
 565                 (mad->mad_hdr.method & IB_MGMT_METHOD_RESP));
 566 }
 567
 568 static void dequeue_mad(struct ib_mad_list_head *mad_list)
 569 {
 570         struct ib_mad_queue *mad_queue;
 571         unsigned long flags;
 572
 573         BUG_ON(!mad_list->mad_queue);
 574         mad_queue = mad_list->mad_queue;
 575         spin_lock_irqsave(&mad_queue->lock, flags);
 576         list_del(&mad_list->list);
 577         mad_queue->count--;
 578         spin_unlock_irqrestore(&mad_queue->lock, flags);
 579 }
 580
 581 static void snoop_send(struct ib_mad_qp_info *qp_info,
 582                        struct ib_mad_send_buf *send_buf,
 583                        struct ib_mad_send_wc *mad_send_wc,
 584                        int mad_snoop_flags)
 585 {
 586         struct ib_mad_snoop_private *mad_snoop_priv;
 587         unsigned long flags;
 588         int i;
 589
 590         spin_lock_irqsave(&qp_info->snoop_lock, flags);
 591         for (i = 0; i < qp_info->snoop_table_size; i++) {
 592                 mad_snoop_priv = qp_info->snoop_table[i];
 593                 if (!mad_snoop_priv ||
 594                     !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
 595                         continue;
 596
 597                 atomic_inc(&mad_snoop_priv->refcount);
 598                 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 599                 mad_snoop_priv->agent.snoop_handler(&mad_snoop_priv->agent,
 600                                                     send_buf, mad_send_wc);
 601                 if (atomic_dec_and_test(&mad_snoop_priv->refcount))
 602                         wake_up(&mad_snoop_priv->wait);
 603                 spin_lock_irqsave(&qp_info->snoop_lock, flags);
 604         }
 605         spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 606 }
 607
 608 static void snoop_recv(struct ib_mad_qp_info *qp_info,
 609                        struct ib_mad_recv_wc *mad_recv_wc,
 610                        int mad_snoop_flags)
 611 {
 612         struct ib_mad_snoop_private *mad_snoop_priv;
 613         unsigned long flags;
 614         int i;
 615
 616         spin_lock_irqsave(&qp_info->snoop_lock, flags);
 617         for (i = 0; i < qp_info->snoop_table_size; i++) {
 618                 mad_snoop_priv = qp_info->snoop_table[i];
 619                 if (!mad_snoop_priv ||
 620                     !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
 621                         continue;
 622
 623                 atomic_inc(&mad_snoop_priv->refcount);
 624                 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 625                 mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent,
 626                                                    mad_recv_wc);
 627                 if (atomic_dec_and_test(&mad_snoop_priv->refcount))
 628                         wake_up(&mad_snoop_priv->wait);
 629                 spin_lock_irqsave(&qp_info->snoop_lock, flags);
 630         }
 631         spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 632 }
 633
 634 static void build_smp_wc(u64 wr_id, u16 slid, u16 pkey_index, u8 port_num,
 635                          struct ib_wc *wc)
 636 {
 637         memset(wc, 0, sizeof *wc);
 638         wc->wr_id = wr_id;
 639         wc->status = IB_WC_SUCCESS;
 640         wc->opcode = IB_WC_RECV;
 641         wc->pkey_index = pkey_index;
 642         wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh);
 643         wc->src_qp = IB_QP0;
 644         wc->qp_num = IB_QP0;
 645         wc->slid = slid;
 646         wc->sl = 0;
 647         wc->dlid_path_bits = 0;
 648         wc->port_num = port_num;
 649 }
 650
 651 /*
 652  * Return 0 if SMP is to be sent
 653  * Return 1 if SMP was consumed locally (whether or not solicited)
 654  * Return < 0 if error
 655  */
 656 static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv,
 657                                   struct ib_mad_send_wr_private *mad_send_wr)
 658 {
 659         int ret;
 660         struct ib_smp *smp = mad_send_wr->send_buf.mad;
 661         unsigned long flags;
 662         struct ib_mad_local_private *local;
 663         struct ib_mad_private *mad_priv;
 664         struct ib_mad_port_private *port_priv;
 665         struct ib_mad_agent_private *recv_mad_agent = NULL;
 666         struct ib_device *device = mad_agent_priv->agent.device;
 667         u8 port_num = mad_agent_priv->agent.port_num;
 668         struct ib_wc mad_wc;
 669         struct ib_send_wr *send_wr = &mad_send_wr->send_wr;
 670
 671         if (!smi_handle_dr_smp_send(smp, device->node_type, port_num)) {
 672                 ret = -EINVAL;
 673                 printk(KERN_ERR PFX "Invalid directed route\n");
 674                 goto out;
 675         }
 676         /* Check to post send on QP or process locally */
 677         ret = smi_check_local_dr_smp(smp, device, port_num);
 678         if (!ret || !device->process_mad)
 679                 goto out;
 680
 681         local = kmalloc(sizeof *local, GFP_ATOMIC);
 682         if (!local) {
 683                 ret = -ENOMEM;
 684                 printk(KERN_ERR PFX "No memory for ib_mad_local_private\n");
 685                 goto out;
 686         }
 687         local->mad_priv = NULL;
 688         local->recv_mad_agent = NULL;
 689         mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_ATOMIC);
 690         if (!mad_priv) {
 691                 ret = -ENOMEM;
 692                 printk(KERN_ERR PFX "No memory for local response MAD\n");
 693                 kfree(local);
 694                 goto out;
 695         }
 696
 697         build_smp_wc(send_wr->wr_id, be16_to_cpu(smp->dr_slid),
 698                      send_wr->wr.ud.pkey_index,
 699                      send_wr->wr.ud.port_num, &mad_wc);
 700
 701         /* No GRH for DR SMP */
 702         ret = device->process_mad(device, 0, port_num, &mad_wc, NULL,
 703                                   (struct ib_mad *)smp,
 704                                   (struct ib_mad *)&mad_priv->mad);
 705         switch (ret)
 706         {
 707         case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
 708                 if (response_mad(&mad_priv->mad.mad) &&
 709                     mad_agent_priv->agent.recv_handler) {
 710                         local->mad_priv = mad_priv;
 711                         local->recv_mad_agent = mad_agent_priv;
 712                         /*
 713                          * Reference MAD agent until receive
 714                          * side of local completion handled
 715                          */
 716                         atomic_inc(&mad_agent_priv->refcount);
 717                 } else
 718                         kmem_cache_free(ib_mad_cache, mad_priv);
 719                 break;
 720         case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
 721                 kmem_cache_free(ib_mad_cache, mad_priv);
 722                 break;
 723         case IB_MAD_RESULT_SUCCESS:
 724                 /* Treat like an incoming receive MAD */
 725                 port_priv = ib_get_mad_port(mad_agent_priv->agent.device,
 726                                             mad_agent_priv->agent.port_num);
 727                 if (port_priv) {
 728                         mad_priv->mad.mad.mad_hdr.tid =
 729                                 ((struct ib_mad *)smp)->mad_hdr.tid;
 730                         recv_mad_agent = find_mad_agent(port_priv,
 731                                                         &mad_priv->mad.mad);
 732                 }
 733                 if (!port_priv || !recv_mad_agent) {
 734                         kmem_cache_free(ib_mad_cache, mad_priv);
 735                         kfree(local);
 736                         ret = 0;
 737                         goto out;
 738                 }
 739                 local->mad_priv = mad_priv;
 740                 local->recv_mad_agent = recv_mad_agent;
 741                 break;
 742         default:
 743                 kmem_cache_free(ib_mad_cache, mad_priv);
 744                 kfree(local);
 745                 ret = -EINVAL;
 746                 goto out;
 747         }
 748
 749         local->mad_send_wr = mad_send_wr;
 750         /* Reference MAD agent until send side of local completion handled */
 751         atomic_inc(&mad_agent_priv->refcount);
 752         /* Queue local completion to local list */
 753         spin_lock_irqsave(&mad_agent_priv->lock, flags);
 754         list_add_tail(&local->completion_list, &mad_agent_priv->local_list);
 755         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
 756         queue_work(mad_agent_priv->qp_info->port_priv->wq,
 757                    &mad_agent_priv->local_work);
 758         ret = 1;
 759 out:
 760         return ret;
 761 }
 762
 763 static int get_buf_length(int hdr_len, int data_len)
 764 {
 765         int seg_size, pad;
 766
 767         seg_size = sizeof(struct ib_mad) - hdr_len;
 768         if (data_len && seg_size) {
 769                 pad = seg_size - data_len % seg_size;
 770                 if (pad == seg_size)
 771                         pad = 0;
 772         } else
 773                 pad = seg_size;
 774         return hdr_len + data_len + pad;
 775 }
 776
 777 struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
 778                                             u32 remote_qpn, u16 pkey_index,
 779                                             int rmpp_active,
 780                                             int hdr_len, int data_len,
 781                                             gfp_t gfp_mask)
 782 {
 783         struct ib_mad_agent_private *mad_agent_priv;
 784         struct ib_mad_send_wr_private *mad_send_wr;
 785         int buf_size;
 786         void *buf;
 787
 788         mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
 789                                       agent);
 790         buf_size = get_buf_length(hdr_len, data_len);
 791
 792         if ((!mad_agent->rmpp_version &&
 793              (rmpp_active || buf_size > sizeof(struct ib_mad))) ||
 794             (!rmpp_active && buf_size > sizeof(struct ib_mad)))
 795                 return ERR_PTR(-EINVAL);
 796
 797         buf = kmalloc(sizeof *mad_send_wr + buf_size, gfp_mask);
 798         if (!buf)
 799                 return ERR_PTR(-ENOMEM);
 800         memset(buf, 0, sizeof *mad_send_wr + buf_size);
 801
 802         mad_send_wr = buf + buf_size;
 803         mad_send_wr->send_buf.mad = buf;
 804
 805         mad_send_wr->mad_agent_priv = mad_agent_priv;
 806         mad_send_wr->sg_list[0].length = buf_size;
 807         mad_send_wr->sg_list[0].lkey = mad_agent->mr->lkey;
 808
 809         mad_send_wr->send_wr.wr_id = (unsigned long) mad_send_wr;
 810         mad_send_wr->send_wr.sg_list = mad_send_wr->sg_list;
 811         mad_send_wr->send_wr.num_sge = 1;
 812         mad_send_wr->send_wr.opcode = IB_WR_SEND;
 813         mad_send_wr->send_wr.send_flags = IB_SEND_SIGNALED;
 814         mad_send_wr->send_wr.wr.ud.remote_qpn = remote_qpn;
 815         mad_send_wr->send_wr.wr.ud.remote_qkey = IB_QP_SET_QKEY;
 816         mad_send_wr->send_wr.wr.ud.pkey_index = pkey_index;
 817
 818         if (rmpp_active) {
 819                 struct ib_rmpp_mad *rmpp_mad = mad_send_wr->send_buf.mad;
 820                 rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(hdr_len -
 821                                                    IB_MGMT_RMPP_HDR + data_len);
 822                 rmpp_mad->rmpp_hdr.rmpp_version = mad_agent->rmpp_version;
 823                 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA;
 824                 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr,
 825                                   IB_MGMT_RMPP_FLAG_ACTIVE);
 826         }
 827
 828         mad_send_wr->send_buf.mad_agent = mad_agent;
 829         atomic_inc(&mad_agent_priv->refcount);
 830         return &mad_send_wr->send_buf;
 831 }
 832 EXPORT_SYMBOL(ib_create_send_mad);
 833
 834 void ib_free_send_mad(struct ib_mad_send_buf *send_buf)
 835 {
 836         struct ib_mad_agent_private *mad_agent_priv;
 837
 838         mad_agent_priv = container_of(send_buf->mad_agent,
 839                                       struct ib_mad_agent_private, agent);
 840         kfree(send_buf->mad);
 841
 842         if (atomic_dec_and_test(&mad_agent_priv->refcount))
 843                 wake_up(&mad_agent_priv->wait);
 844 }
 845 EXPORT_SYMBOL(ib_free_send_mad);
 846
 847 int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr)
 848 {
 849         struct ib_mad_qp_info *qp_info;
 850         struct list_head *list;
 851         struct ib_send_wr *bad_send_wr;
 852         struct ib_mad_agent *mad_agent;
 853         struct ib_sge *sge;
 854         unsigned long flags;
 855         int ret;
 856
 857         /* Set WR ID to find mad_send_wr upon completion */
 858         qp_info = mad_send_wr->mad_agent_priv->qp_info;
 859         mad_send_wr->send_wr.wr_id = (unsigned long)&mad_send_wr->mad_list;
 860         mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;
 861
 862         mad_agent = mad_send_wr->send_buf.mad_agent;
 863         sge = mad_send_wr->sg_list;
 864         sge->addr = dma_map_single(mad_agent->device->dma_device,
 865                                    mad_send_wr->send_buf.mad, sge->length,
 866                                    DMA_TO_DEVICE);
 867         pci_unmap_addr_set(mad_send_wr, mapping, sge->addr);
 868
 869         spin_lock_irqsave(&qp_info->send_queue.lock, flags);
 870         if (qp_info->send_queue.count < qp_info->send_queue.max_active) {
 871                 ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr,
 872                                    &bad_send_wr);
 873                 list = &qp_info->send_queue.list;
 874         } else {
 875                 ret = 0;
 876                 list = &qp_info->overflow_list;
 877         }
 878
 879         if (!ret) {
 880                 qp_info->send_queue.count++;
 881                 list_add_tail(&mad_send_wr->mad_list.list, list);
 882         }
 883         spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
 884         if (ret)
 885                 dma_unmap_single(mad_agent->device->dma_device,
 886                                  pci_unmap_addr(mad_send_wr, mapping),
 887                                  sge->length, DMA_TO_DEVICE);
 888
 889         return ret;
 890 }
 891
 892 /*
 893  * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
 894  *  with the registered client
 895  */
 896 int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
 897                      struct ib_mad_send_buf **bad_send_buf)
 898 {
 899         struct ib_mad_agent_private *mad_agent_priv;
 900         struct ib_mad_send_buf *next_send_buf;
 901         struct ib_mad_send_wr_private *mad_send_wr;
 902         unsigned long flags;
 903         int ret = -EINVAL;
 904
 905         /* Walk list of send WRs and post each on send list */
 906         for (; send_buf; send_buf = next_send_buf) {
 907
 908                 mad_send_wr = container_of(send_buf,
 909                                            struct ib_mad_send_wr_private,
 910                                            send_buf);
 911                 mad_agent_priv = mad_send_wr->mad_agent_priv;
 912
 913                 if (!send_buf->mad_agent->send_handler ||
 914                     (send_buf->timeout_ms &&
 915                      !send_buf->mad_agent->recv_handler)) {
 916                         ret = -EINVAL;
 917                         goto error;
 918                 }
 919
 920                 /*
 921                  * Save pointer to next work request to post in case the
 922                  * current one completes, and the user modifies the work
 923                  * request associated with the completion
 924                  */
 925                 next_send_buf = send_buf->next;
 926                 mad_send_wr->send_wr.wr.ud.ah = send_buf->ah;
 927
 928                 if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class ==
 929                     IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
 930                         ret = handle_outgoing_dr_smp(mad_agent_priv,
 931                                                      mad_send_wr);
 932                         if (ret < 0)            /* error */
 933                                 goto error;
 934                         else if (ret == 1)      /* locally consumed */
 935                                 continue;
 936                 }
 937
 938                 mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid;
 939                 /* Timeout will be updated after send completes */
 940                 mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms);
 941                 mad_send_wr->retries = send_buf->retries;
 942                 /* Reference for work request to QP + response */
 943                 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0);
 944                 mad_send_wr->status = IB_WC_SUCCESS;
 945
 946                 /* Reference MAD agent until send completes */
 947                 atomic_inc(&mad_agent_priv->refcount);
 948                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
 949                 list_add_tail(&mad_send_wr->agent_list,
 950                               &mad_agent_priv->send_list);
 951                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
 952
 953                 if (mad_agent_priv->agent.rmpp_version) {
 954                         ret = ib_send_rmpp_mad(mad_send_wr);
 955                         if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED)
 956                                 ret = ib_send_mad(mad_send_wr);
 957                 } else
 958                         ret = ib_send_mad(mad_send_wr);
 959                 if (ret < 0) {
 960                         /* Fail send request */
 961                         spin_lock_irqsave(&mad_agent_priv->lock, flags);
 962                         list_del(&mad_send_wr->agent_list);
 963                         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
 964                         atomic_dec(&mad_agent_priv->refcount);
 965                         goto error;
 966                 }
 967         }
 968         return 0;
 969 error:
 970         if (bad_send_buf)
 971                 *bad_send_buf = send_buf;
 972         return ret;
 973 }
 974 EXPORT_SYMBOL(ib_post_send_mad);
 975
 976 /*
 977  * ib_free_recv_mad - Returns data buffers used to receive
 978  *  a MAD to the access layer
 979  */
 980 void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc)
 981 {
 982         struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf;
 983         struct ib_mad_private_header *mad_priv_hdr;
 984         struct ib_mad_private *priv;
 985         struct list_head free_list;
 986
 987         INIT_LIST_HEAD(&free_list);
 988         list_splice_init(&mad_recv_wc->rmpp_list, &free_list);
 989
 990         list_for_each_entry_safe(mad_recv_buf, temp_recv_buf,
 991                                         &free_list, list) {
 992                 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc,
 993                                            recv_buf);
 994                 mad_priv_hdr = container_of(mad_recv_wc,
 995                                             struct ib_mad_private_header,
 996                                             recv_wc);
 997                 priv = container_of(mad_priv_hdr, struct ib_mad_private,
 998                                     header);
 999                 kmem_cache_free(ib_mad_cache, priv);
1000         }
1001 }
1002 EXPORT_SYMBOL(ib_free_recv_mad);
1003
1004 struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
1005                                         u8 rmpp_version,
1006                                         ib_mad_send_handler send_handler,
1007                                         ib_mad_recv_handler recv_handler,
1008                                         void *context)
1009 {
1010         return ERR_PTR(-EINVAL);        /* XXX: for now */
1011 }
1012 EXPORT_SYMBOL(ib_redirect_mad_qp);
1013
1014 int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
1015                       struct ib_wc *wc)
1016 {
1017         printk(KERN_ERR PFX "ib_process_mad_wc() not implemented yet\n");
1018         return 0;
1019 }
1020 EXPORT_SYMBOL(ib_process_mad_wc);
1021
1022 static int method_in_use(struct ib_mad_mgmt_method_table **method,
1023                          struct ib_mad_reg_req *mad_reg_req)
1024 {
1025         int i;
1026
1027         for (i = find_first_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS);
1028              i < IB_MGMT_MAX_METHODS;
1029              i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1030                                1+i)) {
1031                 if ((*method)->agent[i]) {
1032                         printk(KERN_ERR PFX "Method %d already in use\n", i);
1033                         return -EINVAL;
1034                 }
1035         }
1036         return 0;
1037 }
1038
1039 static int allocate_method_table(struct ib_mad_mgmt_method_table **method)
1040 {
1041         /* Allocate management method table */
1042         *method = kmalloc(sizeof **method, GFP_ATOMIC);
1043         if (!*method) {
1044                 printk(KERN_ERR PFX "No memory for "
1045                        "ib_mad_mgmt_method_table\n");
1046                 return -ENOMEM;
1047         }
1048         /* Clear management method table */
1049         memset(*method, 0, sizeof **method);
1050
1051         return 0;
1052 }
1053
1054 /*
1055  * Check to see if there are any methods still in use
1056  */
1057 static int check_method_table(struct ib_mad_mgmt_method_table *method)
1058 {
1059         int i;
1060
1061         for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
1062                 if (method->agent[i])
1063                         return 1;
1064         return 0;
1065 }
1066
1067 /*
1068  * Check to see if there are any method tables for this class still in use
1069  */
1070 static int check_class_table(struct ib_mad_mgmt_class_table *class)
1071 {
1072         int i;
1073
1074         for (i = 0; i < MAX_MGMT_CLASS; i++)
1075                 if (class->method_table[i])
1076                         return 1;
1077         return 0;
1078 }
1079
1080 static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class)
1081 {
1082         int i;
1083
1084         for (i = 0; i < MAX_MGMT_OUI; i++)
1085                 if (vendor_class->method_table[i])
1086                         return 1;
1087         return 0;
1088 }
1089
1090 static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class,
1091                            char *oui)
1092 {
1093         int i;
1094
1095         for (i = 0; i < MAX_MGMT_OUI; i++)
1096                 /* Is there matching OUI for this vendor class ? */
1097                 if (!memcmp(vendor_class->oui[i], oui, 3))
1098                         return i;
1099
1100         return -1;
1101 }
1102
1103 static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor)
1104 {
1105         int i;
1106
1107         for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++)
1108                 if (vendor->vendor_class[i])
1109                         return 1;
1110
1111         return 0;
1112 }
1113
1114 static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method,
1115                                      struct ib_mad_agent_private *agent)
1116 {
1117         int i;
1118
1119         /* Remove any methods for this mad agent */
1120         for (i = 0; i < IB_MGMT_MAX_METHODS; i++) {
1121                 if (method->agent[i] == agent) {
1122                         method->agent[i] = NULL;
1123                 }
1124         }
1125 }
1126
1127 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1128                               struct ib_mad_agent_private *agent_priv,
1129                               u8 mgmt_class)
1130 {
1131         struct ib_mad_port_private *port_priv;
1132         struct ib_mad_mgmt_class_table **class;
1133         struct ib_mad_mgmt_method_table **method;
1134         int i, ret;
1135
1136         port_priv = agent_priv->qp_info->port_priv;
1137         class = &port_priv->version[mad_reg_req->mgmt_class_version].class;
1138         if (!*class) {
1139                 /* Allocate management class table for "new" class version */
1140                 *class = kmalloc(sizeof **class, GFP_ATOMIC);
1141                 if (!*class) {
1142                         printk(KERN_ERR PFX "No memory for "
1143                                "ib_mad_mgmt_class_table\n");
1144                         ret = -ENOMEM;
1145                         goto error1;
1146                 }
1147                 /* Clear management class table */
1148                 memset(*class, 0, sizeof(**class));
1149                 /* Allocate method table for this management class */
1150                 method = &(*class)->method_table[mgmt_class];
1151                 if ((ret = allocate_method_table(method)))
1152                         goto error2;
1153         } else {
1154                 method = &(*class)->method_table[mgmt_class];
1155                 if (!*method) {
1156                         /* Allocate method table for this management class */
1157                         if ((ret = allocate_method_table(method)))
1158                                 goto error1;
1159                 }
1160         }
1161
1162         /* Now, make sure methods are not already in use */
1163         if (method_in_use(method, mad_reg_req))
1164                 goto error3;
1165
1166         /* Finally, add in methods being registered */
1167         for (i = find_first_bit(mad_reg_req->method_mask,
1168                                 IB_MGMT_MAX_METHODS);
1169              i < IB_MGMT_MAX_METHODS;
1170              i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1171                                1+i)) {
1172                 (*method)->agent[i] = agent_priv;
1173         }
1174         return 0;
1175
1176 error3:
1177         /* Remove any methods for this mad agent */
1178         remove_methods_mad_agent(*method, agent_priv);
1179         /* Now, check to see if there are any methods in use */
1180         if (!check_method_table(*method)) {
1181                 /* If not, release management method table */
1182                 kfree(*method);
1183                 *method = NULL;
1184         }
1185         ret = -EINVAL;
1186         goto error1;
1187 error2:
1188         kfree(*class);
1189         *class = NULL;
1190 error1:
1191         return ret;
1192 }
1193
1194 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1195                            struct ib_mad_agent_private *agent_priv)
1196 {
1197         struct ib_mad_port_private *port_priv;
1198         struct ib_mad_mgmt_vendor_class_table **vendor_table;
1199         struct ib_mad_mgmt_vendor_class_table *vendor = NULL;
1200         struct ib_mad_mgmt_vendor_class *vendor_class = NULL;
1201         struct ib_mad_mgmt_method_table **method;
1202         int i, ret = -ENOMEM;
1203         u8 vclass;
1204
1205         /* "New" vendor (with OUI) class */
1206         vclass = vendor_class_index(mad_reg_req->mgmt_class);
1207         port_priv = agent_priv->qp_info->port_priv;
1208         vendor_table = &port_priv->version[
1209                                 mad_reg_req->mgmt_class_version].vendor;
1210         if (!*vendor_table) {
1211                 /* Allocate mgmt vendor class table for "new" class version */
1212                 vendor = kmalloc(sizeof *vendor, GFP_ATOMIC);
1213                 if (!vendor) {
1214                         printk(KERN_ERR PFX "No memory for "
1215                                "ib_mad_mgmt_vendor_class_table\n");
1216                         goto error1;
1217                 }
1218                 /* Clear management vendor class table */
1219                 memset(vendor, 0, sizeof(*vendor));
1220                 *vendor_table = vendor;
1221         }
1222         if (!(*vendor_table)->vendor_class[vclass]) {
1223                 /* Allocate table for this management vendor class */
1224                 vendor_class = kmalloc(sizeof *vendor_class, GFP_ATOMIC);
1225                 if (!vendor_class) {
1226                         printk(KERN_ERR PFX "No memory for "
1227                                "ib_mad_mgmt_vendor_class\n");
1228                         goto error2;
1229                 }
1230                 memset(vendor_class, 0, sizeof(*vendor_class));
1231                 (*vendor_table)->vendor_class[vclass] = vendor_class;
1232         }
1233         for (i = 0; i < MAX_MGMT_OUI; i++) {
1234                 /* Is there matching OUI for this vendor class ? */
1235                 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i],
1236                             mad_reg_req->oui, 3)) {
1237                         method = &(*vendor_table)->vendor_class[
1238                                                 vclass]->method_table[i];
1239                         BUG_ON(!*method);
1240                         goto check_in_use;
1241                 }
1242         }
1243         for (i = 0; i < MAX_MGMT_OUI; i++) {
1244                 /* OUI slot available ? */
1245                 if (!is_vendor_oui((*vendor_table)->vendor_class[
1246                                 vclass]->oui[i])) {
1247                         method = &(*vendor_table)->vendor_class[
1248                                 vclass]->method_table[i];
1249                         BUG_ON(*method);
1250                         /* Allocate method table for this OUI */
1251                         if ((ret = allocate_method_table(method)))
1252                                 goto error3;
1253                         memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
1254                                mad_reg_req->oui, 3);
1255                         goto check_in_use;
1256                 }
1257         }
1258         printk(KERN_ERR PFX "All OUI slots in use\n");
1259         goto error3;
1260
1261 check_in_use:
1262         /* Now, make sure methods are not already in use */
1263         if (method_in_use(method, mad_reg_req))
1264                 goto error4;
1265
1266         /* Finally, add in methods being registered */
1267         for (i = find_first_bit(mad_reg_req->method_mask,
1268                                 IB_MGMT_MAX_METHODS);
1269              i < IB_MGMT_MAX_METHODS;
1270              i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1271                                1+i)) {
1272                 (*method)->agent[i] = agent_priv;
1273         }
1274         return 0;
1275
1276 error4:
1277         /* Remove any methods for this mad agent */
1278         remove_methods_mad_agent(*method, agent_priv);
1279         /* Now, check to see if there are any methods in use */
1280         if (!check_method_table(*method)) {
1281                 /* If not, release management method table */
1282                 kfree(*method);
1283                 *method = NULL;
1284         }
1285         ret = -EINVAL;
1286 error3:
1287         if (vendor_class) {
1288                 (*vendor_table)->vendor_class[vclass] = NULL;
1289                 kfree(vendor_class);
1290         }
1291 error2:
1292         if (vendor) {
1293                 *vendor_table = NULL;
1294                 kfree(vendor);
1295         }
1296 error1:
1297         return ret;
1298 }
1299
1300 static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv)
1301 {
1302         struct ib_mad_port_private *port_priv;
1303         struct ib_mad_mgmt_class_table *class;
1304         struct ib_mad_mgmt_method_table *method;
1305         struct ib_mad_mgmt_vendor_class_table *vendor;
1306         struct ib_mad_mgmt_vendor_class *vendor_class;
1307         int index;
1308         u8 mgmt_class;
1309
1310         /*
1311          * Was MAD registration request supplied
1312          * with original registration ?
1313          */
1314         if (!agent_priv->reg_req) {
1315                 goto out;
1316         }
1317
1318         port_priv = agent_priv->qp_info->port_priv;
1319         mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class);
1320         class = port_priv->version[
1321                         agent_priv->reg_req->mgmt_class_version].class;
1322         if (!class)
1323                 goto vendor_check;
1324
1325         method = class->method_table[mgmt_class];
1326         if (method) {
1327                 /* Remove any methods for this mad agent */
1328                 remove_methods_mad_agent(method, agent_priv);
1329                 /* Now, check to see if there are any methods still in use */
1330                 if (!check_method_table(method)) {
1331                         /* If not, release management method table */
1332                          kfree(method);
1333                          class->method_table[mgmt_class] = NULL;
1334                          /* Any management classes left ? */
1335                         if (!check_class_table(class)) {
1336                                 /* If not, release management class table */
1337                                 kfree(class);
1338                                 port_priv->version[
1339                                         agent_priv->reg_req->
1340                                         mgmt_class_version].class = NULL;
1341                         }
1342                 }
1343         }
1344
1345 vendor_check:
1346         if (!is_vendor_class(mgmt_class))
1347                 goto out;
1348
1349         /* normalize mgmt_class to vendor range 2 */
1350         mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class);
1351         vendor = port_priv->version[
1352                         agent_priv->reg_req->mgmt_class_version].vendor;
1353
1354         if (!vendor)
1355                 goto out;
1356
1357         vendor_class = vendor->vendor_class[mgmt_class];
1358         if (vendor_class) {
1359                 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui);
1360                 if (index < 0)
1361                         goto out;
1362                 method = vendor_class->method_table[index];
1363                 if (method) {
1364                         /* Remove any methods for this mad agent */
1365                         remove_methods_mad_agent(method, agent_priv);
1366                         /*
1367                          * Now, check to see if there are
1368                          * any methods still in use
1369                          */
1370                         if (!check_method_table(method)) {
1371                                 /* If not, release management method table */
1372                                 kfree(method);
1373                                 vendor_class->method_table[index] = NULL;
1374                                 memset(vendor_class->oui[index], 0, 3);
1375                                 /* Any OUIs left ? */
1376                                 if (!check_vendor_class(vendor_class)) {
1377                                         /* If not, release vendor class table */
1378                                         kfree(vendor_class);
1379                                         vendor->vendor_class[mgmt_class] = NULL;
1380                                         /* Any other vendor classes left ? */
1381                                         if (!check_vendor_table(vendor)) {
1382                                                 kfree(vendor);
1383                                                 port_priv->version[
1384                                                         agent_priv->reg_req->
1385                                                         mgmt_class_version].
1386                                                         vendor = NULL;
1387                                         }
1388                                 }
1389                         }
1390                 }
1391         }
1392
1393 out:
1394         return;
1395 }
1396
1397 static struct ib_mad_agent_private *
1398 find_mad_agent(struct ib_mad_port_private *port_priv,
1399                struct ib_mad *mad)
1400 {
1401         struct ib_mad_agent_private *mad_agent = NULL;
1402         unsigned long flags;
1403
1404         spin_lock_irqsave(&port_priv->reg_lock, flags);
1405         if (response_mad(mad)) {
1406                 u32 hi_tid;
1407                 struct ib_mad_agent_private *entry;
1408
1409                 /*
1410                  * Routing is based on high 32 bits of transaction ID
1411                  * of MAD.
1412                  */
1413                 hi_tid = be64_to_cpu(mad->mad_hdr.tid) >> 32;
1414                 list_for_each_entry(entry, &port_priv->agent_list, agent_list) {
1415                         if (entry->agent.hi_tid == hi_tid) {
1416                                 mad_agent = entry;
1417                                 break;
1418                         }
1419                 }
1420         } else {
1421                 struct ib_mad_mgmt_class_table *class;
1422                 struct ib_mad_mgmt_method_table *method;
1423                 struct ib_mad_mgmt_vendor_class_table *vendor;
1424                 struct ib_mad_mgmt_vendor_class *vendor_class;
1425                 struct ib_vendor_mad *vendor_mad;
1426                 int index;
1427
1428                 /*
1429                  * Routing is based on version, class, and method
1430                  * For "newer" vendor MADs, also based on OUI
1431                  */
1432                 if (mad->mad_hdr.class_version >= MAX_MGMT_VERSION)
1433                         goto out;
1434                 if (!is_vendor_class(mad->mad_hdr.mgmt_class)) {
1435                         class = port_priv->version[
1436                                         mad->mad_hdr.class_version].class;
1437                         if (!class)
1438                                 goto out;
1439                         method = class->method_table[convert_mgmt_class(
1440                                                         mad->mad_hdr.mgmt_class)];
1441                         if (method)
1442                                 mad_agent = method->agent[mad->mad_hdr.method &
1443                                                           ~IB_MGMT_METHOD_RESP];
1444                 } else {
1445                         vendor = port_priv->version[
1446                                         mad->mad_hdr.class_version].vendor;
1447                         if (!vendor)
1448                                 goto out;
1449                         vendor_class = vendor->vendor_class[vendor_class_index(
1450                                                 mad->mad_hdr.mgmt_class)];
1451                         if (!vendor_class)
1452                                 goto out;
1453                         /* Find matching OUI */
1454                         vendor_mad = (struct ib_vendor_mad *)mad;
1455                         index = find_vendor_oui(vendor_class, vendor_mad->oui);
1456                         if (index == -1)
1457                                 goto out;
1458                         method = vendor_class->method_table[index];
1459                         if (method) {
1460                                 mad_agent = method->agent[mad->mad_hdr.method &
1461                                                           ~IB_MGMT_METHOD_RESP];
1462                         }
1463                 }
1464         }
1465
1466         if (mad_agent) {
1467                 if (mad_agent->agent.recv_handler)
1468                         atomic_inc(&mad_agent->refcount);
1469                 else {
1470                         printk(KERN_NOTICE PFX "No receive handler for client "
1471                                "%p on port %d\n",
1472                                &mad_agent->agent, port_priv->port_num);
1473                         mad_agent = NULL;
1474                 }
1475         }
1476 out:
1477         spin_unlock_irqrestore(&port_priv->reg_lock, flags);
1478
1479         return mad_agent;
1480 }
1481
1482 static int validate_mad(struct ib_mad *mad, u32 qp_num)
1483 {
1484         int valid = 0;
1485
1486         /* Make sure MAD base version is understood */
1487         if (mad->mad_hdr.base_version != IB_MGMT_BASE_VERSION) {
1488                 printk(KERN_ERR PFX "MAD received with unsupported base "
1489                        "version %d\n", mad->mad_hdr.base_version);
1490                 goto out;
1491         }
1492
1493         /* Filter SMI packets sent to other than QP0 */
1494         if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
1495             (mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
1496                 if (qp_num == 0)
1497                         valid = 1;
1498         } else {
1499                 /* Filter GSI packets sent to QP0 */
1500                 if (qp_num != 0)
1501                         valid = 1;
1502         }
1503
1504 out:
1505         return valid;
1506 }
1507
1508 static int is_data_mad(struct ib_mad_agent_private *mad_agent_priv,
1509                        struct ib_mad_hdr *mad_hdr)
1510 {
1511         struct ib_rmpp_mad *rmpp_mad;
1512
1513         rmpp_mad = (struct ib_rmpp_mad *)mad_hdr;
1514         return !mad_agent_priv->agent.rmpp_version ||
1515                 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
1516                                     IB_MGMT_RMPP_FLAG_ACTIVE) ||
1517                 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA);
1518 }
1519
1520 struct ib_mad_send_wr_private*
1521 ib_find_send_mad(struct ib_mad_agent_private *mad_agent_priv, __be64 tid)
1522 {
1523         struct ib_mad_send_wr_private *mad_send_wr;
1524
1525         list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
1526                             agent_list) {
1527                 if (mad_send_wr->tid == tid)
1528                         return mad_send_wr;
1529         }
1530
1531         /*
1532          * It's possible to receive the response before we've
1533          * been notified that the send has completed
1534          */
1535         list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
1536                             agent_list) {
1537                 if (is_data_mad(mad_agent_priv, mad_send_wr->send_buf.mad) &&
1538                     mad_send_wr->tid == tid && mad_send_wr->timeout) {
1539                         /* Verify request has not been canceled */
1540                         return (mad_send_wr->status == IB_WC_SUCCESS) ?
1541                                 mad_send_wr : NULL;
1542                 }
1543         }
1544         return NULL;
1545 }
1546
1547 void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr)
1548 {
1549         mad_send_wr->timeout = 0;
1550         if (mad_send_wr->refcount == 1) {
1551                 list_del(&mad_send_wr->agent_list);
1552                 list_add_tail(&mad_send_wr->agent_list,
1553                               &mad_send_wr->mad_agent_priv->done_list);
1554         }
1555 }
1556
1557 static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
1558                                  struct ib_mad_recv_wc *mad_recv_wc)
1559 {
1560         struct ib_mad_send_wr_private *mad_send_wr;
1561         struct ib_mad_send_wc mad_send_wc;
1562         unsigned long flags;
1563         __be64 tid;
1564
1565         INIT_LIST_HEAD(&mad_recv_wc->rmpp_list);
1566         list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list);
1567         if (mad_agent_priv->agent.rmpp_version) {
1568                 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv,
1569                                                       mad_recv_wc);
1570                 if (!mad_recv_wc) {
1571                         if (atomic_dec_and_test(&mad_agent_priv->refcount))
1572                                 wake_up(&mad_agent_priv->wait);
1573                         return;
1574                 }
1575         }
1576
1577         /* Complete corresponding request */
1578         if (response_mad(mad_recv_wc->recv_buf.mad)) {
1579                 tid = mad_recv_wc->recv_buf.mad->mad_hdr.tid;
1580                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1581                 mad_send_wr = ib_find_send_mad(mad_agent_priv, tid);
1582                 if (!mad_send_wr) {
1583                         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1584                         ib_free_recv_mad(mad_recv_wc);
1585                         if (atomic_dec_and_test(&mad_agent_priv->refcount))
1586                                 wake_up(&mad_agent_priv->wait);
1587                         return;
1588                 }
1589                 ib_mark_mad_done(mad_send_wr);
1590                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1591
1592                 /* Defined behavior is to complete response before request */
1593                 mad_recv_wc->wc->wr_id = (unsigned long) &mad_send_wr->send_buf;
1594                 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1595                                                    mad_recv_wc);
1596                 atomic_dec(&mad_agent_priv->refcount);
1597
1598                 mad_send_wc.status = IB_WC_SUCCESS;
1599                 mad_send_wc.vendor_err = 0;
1600                 mad_send_wc.send_buf = &mad_send_wr->send_buf;
1601                 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
1602         } else {
1603                 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1604                                                    mad_recv_wc);
1605                 if (atomic_dec_and_test(&mad_agent_priv->refcount))
1606                         wake_up(&mad_agent_priv->wait);
1607         }
1608 }
1609
1610 static void ib_mad_recv_done_handler(struct ib_mad_port_private *port_priv,
1611                                      struct ib_wc *wc)
1612 {
1613         struct ib_mad_qp_info *qp_info;
1614         struct ib_mad_private_header *mad_priv_hdr;
1615         struct ib_mad_private *recv, *response;
1616         struct ib_mad_list_head *mad_list;
1617         struct ib_mad_agent_private *mad_agent;
1618
1619         response = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
1620         if (!response)
1621                 printk(KERN_ERR PFX "ib_mad_recv_done_handler no memory "
1622                        "for response buffer\n");
1623
1624         mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
1625         qp_info = mad_list->mad_queue->qp_info;
1626         dequeue_mad(mad_list);
1627
1628         mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header,
1629                                     mad_list);
1630         recv = container_of(mad_priv_hdr, struct ib_mad_private, header);
1631         dma_unmap_single(port_priv->device->dma_device,
1632                          pci_unmap_addr(&recv->header, mapping),
1633                          sizeof(struct ib_mad_private) -
1634                          sizeof(struct ib_mad_private_header),
1635                          DMA_FROM_DEVICE);
1636
1637         /* Setup MAD receive work completion from "normal" work completion */
1638         recv->header.wc = *wc;
1639         recv->header.recv_wc.wc = &recv->header.wc;
1640         recv->header.recv_wc.mad_len = sizeof(struct ib_mad);
1641         recv->header.recv_wc.recv_buf.mad = &recv->mad.mad;
1642         recv->header.recv_wc.recv_buf.grh = &recv->grh;
1643
1644         if (atomic_read(&qp_info->snoop_count))
1645                 snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS);
1646
1647         /* Validate MAD */
1648         if (!validate_mad(&recv->mad.mad, qp_info->qp->qp_num))
1649                 goto out;
1650
1651         if (recv->mad.mad.mad_hdr.mgmt_class ==
1652             IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1653                 if (!smi_handle_dr_smp_recv(&recv->mad.smp,
1654                                             port_priv->device->node_type,
1655                                             port_priv->port_num,
1656                                             port_priv->device->phys_port_cnt))
1657                         goto out;
1658                 if (!smi_check_forward_dr_smp(&recv->mad.smp))
1659                         goto local;
1660                 if (!smi_handle_dr_smp_send(&recv->mad.smp,
1661                                             port_priv->device->node_type,
1662                                             port_priv->port_num))
1663                         goto out;
1664                 if (!smi_check_local_dr_smp(&recv->mad.smp,
1665                                             port_priv->device,
1666                                             port_priv->port_num))
1667                         goto out;
1668         }
1669
1670 local:
1671         /* Give driver "right of first refusal" on incoming MAD */
1672         if (port_priv->device->process_mad) {
1673                 int ret;
1674
1675                 if (!response) {
1676                         printk(KERN_ERR PFX "No memory for response MAD\n");
1677                         /*
1678                          * Is it better to assume that
1679                          * it wouldn't be processed ?
1680                          */
1681                         goto out;
1682                 }
1683
1684                 ret = port_priv->device->process_mad(port_priv->device, 0,
1685                                                      port_priv->port_num,
1686                                                      wc, &recv->grh,
1687                                                      &recv->mad.mad,
1688                                                      &response->mad.mad);
1689                 if (ret & IB_MAD_RESULT_SUCCESS) {
1690                         if (ret & IB_MAD_RESULT_CONSUMED)
1691                                 goto out;
1692                         if (ret & IB_MAD_RESULT_REPLY) {
1693                                 agent_send_response(&response->mad.mad,
1694                                                     &recv->grh, wc,
1695                                                     port_priv->device,
1696                                                     port_priv->port_num,
1697                                                     qp_info->qp->qp_num);
1698                                 goto out;
1699                         }
1700                 }
1701         }
1702
1703         mad_agent = find_mad_agent(port_priv, &recv->mad.mad);
1704         if (mad_agent) {
1705                 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
1706                 /*
1707                  * recv is freed up in error cases in ib_mad_complete_recv
1708                  * or via recv_handler in ib_mad_complete_recv()
1709                  */
1710                 recv = NULL;
1711         }
1712
1713 out:
1714         /* Post another receive request for this QP */
1715         if (response) {
1716                 ib_mad_post_receive_mads(qp_info, response);
1717                 if (recv)
1718                         kmem_cache_free(ib_mad_cache, recv);
1719         } else
1720                 ib_mad_post_receive_mads(qp_info, recv);
1721 }
1722
1723 static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
1724 {
1725         struct ib_mad_send_wr_private *mad_send_wr;
1726         unsigned long delay;
1727
1728         if (list_empty(&mad_agent_priv->wait_list)) {
1729                 cancel_delayed_work(&mad_agent_priv->timed_work);
1730         } else {
1731                 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
1732                                          struct ib_mad_send_wr_private,
1733                                          agent_list);
1734
1735                 if (time_after(mad_agent_priv->timeout,
1736                                mad_send_wr->timeout)) {
1737                         mad_agent_priv->timeout = mad_send_wr->timeout;
1738                         cancel_delayed_work(&mad_agent_priv->timed_work);
1739                         delay = mad_send_wr->timeout - jiffies;
1740                         if ((long)delay <= 0)
1741                                 delay = 1;
1742                         queue_delayed_work(mad_agent_priv->qp_info->
1743                                            port_priv->wq,
1744                                            &mad_agent_priv->timed_work, delay);
1745                 }
1746         }
1747 }
1748
1749 static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
1750 {
1751         struct ib_mad_agent_private *mad_agent_priv;
1752         struct ib_mad_send_wr_private *temp_mad_send_wr;
1753         struct list_head *list_item;
1754         unsigned long delay;
1755
1756         mad_agent_priv = mad_send_wr->mad_agent_priv;
1757         list_del(&mad_send_wr->agent_list);
1758
1759         delay = mad_send_wr->timeout;
1760         mad_send_wr->timeout += jiffies;
1761
1762         if (delay) {
1763                 list_for_each_prev(list_item, &mad_agent_priv->wait_list) {
1764                         temp_mad_send_wr = list_entry(list_item,
1765                                                 struct ib_mad_send_wr_private,
1766                                                 agent_list);
1767                         if (time_after(mad_send_wr->timeout,
1768                                        temp_mad_send_wr->timeout))
1769                                 break;
1770                 }
1771         }
1772         else
1773                 list_item = &mad_agent_priv->wait_list;
1774         list_add(&mad_send_wr->agent_list, list_item);
1775
1776         /* Reschedule a work item if we have a shorter timeout */
1777         if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list) {
1778                 cancel_delayed_work(&mad_agent_priv->timed_work);
1779                 queue_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
1780                                    &mad_agent_priv->timed_work, delay);
1781         }
1782 }
1783
1784 void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr,
1785                           int timeout_ms)
1786 {
1787         mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
1788         wait_for_response(mad_send_wr);
1789 }
1790
1791 /*
1792  * Process a send work completion
1793  */
1794 void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
1795                              struct ib_mad_send_wc *mad_send_wc)
1796 {
1797         struct ib_mad_agent_private     *mad_agent_priv;
1798         unsigned long                   flags;
1799         int                             ret;
1800
1801         mad_agent_priv = mad_send_wr->mad_agent_priv;
1802         spin_lock_irqsave(&mad_agent_priv->lock, flags);
1803         if (mad_agent_priv->agent.rmpp_version) {
1804                 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc);
1805                 if (ret == IB_RMPP_RESULT_CONSUMED)
1806                         goto done;
1807         } else
1808                 ret = IB_RMPP_RESULT_UNHANDLED;
1809
1810         if (mad_send_wc->status != IB_WC_SUCCESS &&
1811             mad_send_wr->status == IB_WC_SUCCESS) {
1812                 mad_send_wr->status = mad_send_wc->status;
1813                 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
1814         }
1815
1816         if (--mad_send_wr->refcount > 0) {
1817                 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout &&
1818                     mad_send_wr->status == IB_WC_SUCCESS) {
1819                         wait_for_response(mad_send_wr);
1820                 }
1821                 goto done;
1822         }
1823
1824         /* Remove send from MAD agent and notify client of completion */
1825         list_del(&mad_send_wr->agent_list);
1826         adjust_timeout(mad_agent_priv);
1827         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1828
1829         if (mad_send_wr->status != IB_WC_SUCCESS )
1830                 mad_send_wc->status = mad_send_wr->status;
1831         if (ret == IB_RMPP_RESULT_INTERNAL)
1832                 ib_rmpp_send_handler(mad_send_wc);
1833         else
1834                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
1835                                                    mad_send_wc);
1836
1837         /* Release reference on agent taken when sending */
1838         if (atomic_dec_and_test(&mad_agent_priv->refcount))
1839                 wake_up(&mad_agent_priv->wait);
1840         return;
1841 done:
1842         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1843 }
1844
1845 static void ib_mad_send_done_handler(struct ib_mad_port_private *port_priv,
1846                                      struct ib_wc *wc)
1847 {
1848         struct ib_mad_send_wr_private   *mad_send_wr, *queued_send_wr;
1849         struct ib_mad_list_head         *mad_list;
1850         struct ib_mad_qp_info           *qp_info;
1851         struct ib_mad_queue             *send_queue;
1852         struct ib_send_wr               *bad_send_wr;
1853         struct ib_mad_send_wc           mad_send_wc;
1854         unsigned long flags;
1855         int ret;
1856
1857         mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
1858         mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
1859                                    mad_list);
1860         send_queue = mad_list->mad_queue;
1861         qp_info = send_queue->qp_info;
1862
1863 retry:
1864         dma_unmap_single(mad_send_wr->send_buf.mad_agent->device->dma_device,
1865                          pci_unmap_addr(mad_send_wr, mapping),
1866                          mad_send_wr->sg_list[0].length, DMA_TO_DEVICE);
1867         queued_send_wr = NULL;
1868         spin_lock_irqsave(&send_queue->lock, flags);
1869         list_del(&mad_list->list);
1870
1871         /* Move queued send to the send queue */
1872         if (send_queue->count-- > send_queue->max_active) {
1873                 mad_list = container_of(qp_info->overflow_list.next,
1874                                         struct ib_mad_list_head, list);
1875                 queued_send_wr = container_of(mad_list,
1876                                         struct ib_mad_send_wr_private,
1877                                         mad_list);
1878                 list_del(&mad_list->list);
1879                 list_add_tail(&mad_list->list, &send_queue->list);
1880         }
1881         spin_unlock_irqrestore(&send_queue->lock, flags);
1882
1883         mad_send_wc.send_buf = &mad_send_wr->send_buf;
1884         mad_send_wc.status = wc->status;
1885         mad_send_wc.vendor_err = wc->vendor_err;
1886         if (atomic_read(&qp_info->snoop_count))
1887                 snoop_send(qp_info, &mad_send_wr->send_buf, &mad_send_wc,
1888                            IB_MAD_SNOOP_SEND_COMPLETIONS);
1889         ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
1890
1891         if (queued_send_wr) {
1892                 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr,
1893                                    &bad_send_wr);
1894                 if (ret) {
1895                         printk(KERN_ERR PFX "ib_post_send failed: %d\n", ret);
1896                         mad_send_wr = queued_send_wr;
1897                         wc->status = IB_WC_LOC_QP_OP_ERR;
1898                         goto retry;
1899                 }
1900         }
1901 }
1902
1903 static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info)
1904 {
1905         struct ib_mad_send_wr_private *mad_send_wr;
1906         struct ib_mad_list_head *mad_list;
1907         unsigned long flags;
1908
1909         spin_lock_irqsave(&qp_info->send_queue.lock, flags);
1910         list_for_each_entry(mad_list, &qp_info->send_queue.list, list) {
1911                 mad_send_wr = container_of(mad_list,
1912                                            struct ib_mad_send_wr_private,
1913                                            mad_list);
1914                 mad_send_wr->retry = 1;
1915         }
1916         spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
1917 }
1918
1919 static void mad_error_handler(struct ib_mad_port_private *port_priv,
1920                               struct ib_wc *wc)
1921 {
1922         struct ib_mad_list_head *mad_list;
1923         struct ib_mad_qp_info *qp_info;
1924         struct ib_mad_send_wr_private *mad_send_wr;
1925         int ret;
1926
1927         /* Determine if failure was a send or receive */
1928         mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
1929         qp_info = mad_list->mad_queue->qp_info;
1930         if (mad_list->mad_queue == &qp_info->recv_queue)
1931                 /*
1932                  * Receive errors indicate that the QP has entered the error
1933                  * state - error handling/shutdown code will cleanup
1934                  */
1935                 return;
1936
1937         /*
1938          * Send errors will transition the QP to SQE - move
1939          * QP to RTS and repost flushed work requests
1940          */
1941         mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
1942                                    mad_list);
1943         if (wc->status == IB_WC_WR_FLUSH_ERR) {
1944                 if (mad_send_wr->retry) {
1945                         /* Repost send */
1946                         struct ib_send_wr *bad_send_wr;
1947
1948                         mad_send_wr->retry = 0;
1949                         ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr,
1950                                         &bad_send_wr);
1951                         if (ret)
1952                                 ib_mad_send_done_handler(port_priv, wc);
1953                 } else
1954                         ib_mad_send_done_handler(port_priv, wc);
1955         } else {
1956                 struct ib_qp_attr *attr;
1957
1958                 /* Transition QP to RTS and fail offending send */
1959                 attr = kmalloc(sizeof *attr, GFP_KERNEL);
1960                 if (attr) {
1961                         attr->qp_state = IB_QPS_RTS;
1962                         attr->cur_qp_state = IB_QPS_SQE;
1963                         ret = ib_modify_qp(qp_info->qp, attr,
1964                                            IB_QP_STATE | IB_QP_CUR_STATE);
1965                         kfree(attr);
1966                         if (ret)
1967                                 printk(KERN_ERR PFX "mad_error_handler - "
1968                                        "ib_modify_qp to RTS : %d\n", ret);
1969                         else
1970                                 mark_sends_for_retry(qp_info);
1971                 }
1972                 ib_mad_send_done_handler(port_priv, wc);
1973         }
1974 }
1975
1976 /*
1977  * IB MAD completion callback
1978  */
1979 static void ib_mad_completion_handler(void *data)
1980 {
1981         struct ib_mad_port_private *port_priv;
1982         struct ib_wc wc;
1983
1984         port_priv = (struct ib_mad_port_private *)data;
1985         ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
1986
1987         while (ib_poll_cq(port_priv->cq, 1, &wc) == 1) {
1988                 if (wc.status == IB_WC_SUCCESS) {
1989                         switch (wc.opcode) {
1990                         case IB_WC_SEND:
1991                                 ib_mad_send_done_handler(port_priv, &wc);
1992                                 break;
1993                         case IB_WC_RECV:
1994                                 ib_mad_recv_done_handler(port_priv, &wc);
1995                                 break;
1996                         default:
1997                                 BUG_ON(1);
1998                                 break;
1999                         }
2000                 } else
2001                         mad_error_handler(port_priv, &wc);
2002         }
2003 }
2004
2005 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
2006 {
2007         unsigned long flags;
2008         struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr;
2009         struct ib_mad_send_wc mad_send_wc;
2010         struct list_head cancel_list;
2011
2012         INIT_LIST_HEAD(&cancel_list);
2013
2014         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2015         list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2016                                  &mad_agent_priv->send_list, agent_list) {
2017                 if (mad_send_wr->status == IB_WC_SUCCESS) {
2018                         mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2019                         mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2020                 }
2021         }
2022
2023         /* Empty wait list to prevent receives from finding a request */
2024         list_splice_init(&mad_agent_priv->wait_list, &cancel_list);
2025         /* Empty local completion list as well */
2026         list_splice_init(&mad_agent_priv->local_list, &cancel_list);
2027         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2028
2029         /* Report all cancelled requests */
2030         mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
2031         mad_send_wc.vendor_err = 0;
2032
2033         list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2034                                  &cancel_list, agent_list) {
2035                 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2036                 list_del(&mad_send_wr->agent_list);
2037                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2038                                                    &mad_send_wc);
2039                 atomic_dec(&mad_agent_priv->refcount);
2040         }
2041 }
2042
2043 static struct ib_mad_send_wr_private*
2044 find_send_wr(struct ib_mad_agent_private *mad_agent_priv,
2045              struct ib_mad_send_buf *send_buf)
2046 {
2047         struct ib_mad_send_wr_private *mad_send_wr;
2048
2049         list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
2050                             agent_list) {
2051                 if (&mad_send_wr->send_buf == send_buf)
2052                         return mad_send_wr;
2053         }
2054
2055         list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
2056                             agent_list) {
2057                 if (is_data_mad(mad_agent_priv, mad_send_wr->send_buf.mad) &&
2058                     &mad_send_wr->send_buf == send_buf)
2059                         return mad_send_wr;
2060         }
2061         return NULL;
2062 }
2063
2064 int ib_modify_mad(struct ib_mad_agent *mad_agent,
2065                   struct ib_mad_send_buf *send_buf, u32 timeout_ms)
2066 {
2067         struct ib_mad_agent_private *mad_agent_priv;
2068         struct ib_mad_send_wr_private *mad_send_wr;
2069         unsigned long flags;
2070         int active;
2071
2072         mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
2073                                       agent);
2074         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2075         mad_send_wr = find_send_wr(mad_agent_priv, send_buf);
2076         if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) {
2077                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2078                 return -EINVAL;
2079         }
2080
2081         active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1);
2082         if (!timeout_ms) {
2083                 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2084                 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2085         }
2086
2087         mad_send_wr->send_buf.timeout_ms = timeout_ms;
2088         if (active)
2089                 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2090         else
2091                 ib_reset_mad_timeout(mad_send_wr, timeout_ms);
2092
2093         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2094         return 0;
2095 }
2096 EXPORT_SYMBOL(ib_modify_mad);
2097
2098 void ib_cancel_mad(struct ib_mad_agent *mad_agent,
2099                    struct ib_mad_send_buf *send_buf)
2100 {
2101         ib_modify_mad(mad_agent, send_buf, 0);
2102 }
2103 EXPORT_SYMBOL(ib_cancel_mad);
2104
2105 static void local_completions(void *data)
2106 {
2107         struct ib_mad_agent_private *mad_agent_priv;
2108         struct ib_mad_local_private *local;
2109         struct ib_mad_agent_private *recv_mad_agent;
2110         unsigned long flags;
2111         int recv = 0;
2112         struct ib_wc wc;
2113         struct ib_mad_send_wc mad_send_wc;
2114
2115         mad_agent_priv = (struct ib_mad_agent_private *)data;
2116
2117         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2118         while (!list_empty(&mad_agent_priv->local_list)) {
2119                 local = list_entry(mad_agent_priv->local_list.next,
2120                                    struct ib_mad_local_private,
2121                                    completion_list);
2122                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2123                 if (local->mad_priv) {
2124                         recv_mad_agent = local->recv_mad_agent;
2125                         if (!recv_mad_agent) {
2126                                 printk(KERN_ERR PFX "No receive MAD agent for local completion\n");
2127                                 goto local_send_completion;
2128                         }
2129
2130                         recv = 1;
2131                         /*
2132                          * Defined behavior is to complete response
2133                          * before request
2134                          */
2135                         build_smp_wc((unsigned long) local->mad_send_wr,
2136                                      be16_to_cpu(IB_LID_PERMISSIVE),
2137                                      0, recv_mad_agent->agent.port_num, &wc);
2138
2139                         local->mad_priv->header.recv_wc.wc = &wc;
2140                         local->mad_priv->header.recv_wc.mad_len =
2141                                                 sizeof(struct ib_mad);
2142                         INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list);
2143                         list_add(&local->mad_priv->header.recv_wc.recv_buf.list,
2144                                  &local->mad_priv->header.recv_wc.rmpp_list);
2145                         local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
2146                         local->mad_priv->header.recv_wc.recv_buf.mad =
2147                                                 &local->mad_priv->mad.mad;
2148                         if (atomic_read(&recv_mad_agent->qp_info->snoop_count))
2149                                 snoop_recv(recv_mad_agent->qp_info,
2150                                           &local->mad_priv->header.recv_wc,
2151                                            IB_MAD_SNOOP_RECVS);
2152                         recv_mad_agent->agent.recv_handler(
2153                                                 &recv_mad_agent->agent,
2154                                                 &local->mad_priv->header.recv_wc);
2155                         spin_lock_irqsave(&recv_mad_agent->lock, flags);
2156                         atomic_dec(&recv_mad_agent->refcount);
2157                         spin_unlock_irqrestore(&recv_mad_agent->lock, flags);
2158                 }
2159
2160 local_send_completion:
2161                 /* Complete send */
2162                 mad_send_wc.status = IB_WC_SUCCESS;
2163                 mad_send_wc.vendor_err = 0;
2164                 mad_send_wc.send_buf = &local->mad_send_wr->send_buf;
2165                 if (atomic_read(&mad_agent_priv->qp_info->snoop_count))
2166                         snoop_send(mad_agent_priv->qp_info,
2167                                    &local->mad_send_wr->send_buf,
2168                                    &mad_send_wc, IB_MAD_SNOOP_SEND_COMPLETIONS);
2169                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2170                                                    &mad_send_wc);
2171
2172                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2173                 list_del(&local->completion_list);
2174                 atomic_dec(&mad_agent_priv->refcount);
2175                 if (!recv)
2176                         kmem_cache_free(ib_mad_cache, local->mad_priv);
2177                 kfree(local);
2178         }
2179         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2180 }
2181
2182 static int retry_send(struct ib_mad_send_wr_private *mad_send_wr)
2183 {
2184         int ret;
2185
2186         if (!mad_send_wr->retries--)
2187                 return -ETIMEDOUT;
2188
2189         mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
2190
2191         if (mad_send_wr->mad_agent_priv->agent.rmpp_version) {
2192                 ret = ib_retry_rmpp(mad_send_wr);
2193                 switch (ret) {
2194                 case IB_RMPP_RESULT_UNHANDLED:
2195                         ret = ib_send_mad(mad_send_wr);
2196                         break;
2197                 case IB_RMPP_RESULT_CONSUMED:
2198                         ret = 0;
2199                         break;
2200                 default:
2201                         ret = -ECOMM;
2202                         break;
2203                 }
2204         } else
2205                 ret = ib_send_mad(mad_send_wr);
2206
2207         if (!ret) {
2208                 mad_send_wr->refcount++;
2209                 list_add_tail(&mad_send_wr->agent_list,
2210                               &mad_send_wr->mad_agent_priv->send_list);
2211         }
2212         return ret;
2213 }
2214
2215 static void timeout_sends(void *data)
2216 {
2217         struct ib_mad_agent_private *mad_agent_priv;
2218         struct ib_mad_send_wr_private *mad_send_wr;
2219         struct ib_mad_send_wc mad_send_wc;
2220         unsigned long flags, delay;
2221
2222         mad_agent_priv = (struct ib_mad_agent_private *)data;
2223         mad_send_wc.vendor_err = 0;
2224
2225         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2226         while (!list_empty(&mad_agent_priv->wait_list)) {
2227                 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2228                                          struct ib_mad_send_wr_private,
2229                                          agent_list);
2230
2231                 if (time_after(mad_send_wr->timeout, jiffies)) {
2232                         delay = mad_send_wr->timeout - jiffies;
2233                         if ((long)delay <= 0)
2234                                 delay = 1;
2235                         queue_delayed_work(mad_agent_priv->qp_info->
2236                                            port_priv->wq,
2237                                            &mad_agent_priv->timed_work, delay);
2238                         break;
2239                 }
2240
2241                 list_del(&mad_send_wr->agent_list);
2242                 if (mad_send_wr->status == IB_WC_SUCCESS &&
2243                     !retry_send(mad_send_wr))
2244                         continue;
2245
2246                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2247
2248                 if (mad_send_wr->status == IB_WC_SUCCESS)
2249                         mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR;
2250                 else
2251                         mad_send_wc.status = mad_send_wr->status;
2252                 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2253                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2254                                                    &mad_send_wc);
2255
2256                 atomic_dec(&mad_agent_priv->refcount);
2257                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2258         }
2259         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2260 }
2261
2262 static void ib_mad_thread_completion_handler(struct ib_cq *cq, void *arg)
2263 {
2264         struct ib_mad_port_private *port_priv = cq->cq_context;
2265
2266         queue_work(port_priv->wq, &port_priv->work);
2267 }
2268
2269 /*
2270  * Allocate receive MADs and post receive WRs for them
2271  */
2272 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
2273                                     struct ib_mad_private *mad)
2274 {
2275         unsigned long flags;
2276         int post, ret;
2277         struct ib_mad_private *mad_priv;
2278         struct ib_sge sg_list;
2279         struct ib_recv_wr recv_wr, *bad_recv_wr;
2280         struct ib_mad_queue *recv_queue = &qp_info->recv_queue;
2281
2282         /* Initialize common scatter list fields */
2283         sg_list.length = sizeof *mad_priv - sizeof mad_priv->header;
2284         sg_list.lkey = (*qp_info->port_priv->mr).lkey;
2285
2286         /* Initialize common receive WR fields */
2287         recv_wr.next = NULL;
2288         recv_wr.sg_list = &sg_list;
2289         recv_wr.num_sge = 1;
2290
2291         do {
2292                 /* Allocate and map receive buffer */
2293                 if (mad) {
2294                         mad_priv = mad;
2295                         mad = NULL;
2296                 } else {
2297                         mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
2298                         if (!mad_priv) {
2299                                 printk(KERN_ERR PFX "No memory for receive buffer\n");
2300                                 ret = -ENOMEM;
2301                                 break;
2302                         }
2303                 }
2304                 sg_list.addr = dma_map_single(qp_info->port_priv->
2305                                                 device->dma_device,
2306                                         &mad_priv->grh,
2307                                         sizeof *mad_priv -
2308                                                 sizeof mad_priv->header,
2309                                         DMA_FROM_DEVICE);
2310                 pci_unmap_addr_set(&mad_priv->header, mapping, sg_list.addr);
2311                 recv_wr.wr_id = (unsigned long)&mad_priv->header.mad_list;
2312                 mad_priv->header.mad_list.mad_queue = recv_queue;
2313
2314                 /* Post receive WR */
2315                 spin_lock_irqsave(&recv_queue->lock, flags);
2316                 post = (++recv_queue->count < recv_queue->max_active);
2317                 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list);
2318                 spin_unlock_irqrestore(&recv_queue->lock, flags);
2319                 ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr);
2320                 if (ret) {
2321                         spin_lock_irqsave(&recv_queue->lock, flags);
2322                         list_del(&mad_priv->header.mad_list.list);
2323                         recv_queue->count--;
2324                         spin_unlock_irqrestore(&recv_queue->lock, flags);
2325                         dma_unmap_single(qp_info->port_priv->device->dma_device,
2326                                          pci_unmap_addr(&mad_priv->header,
2327                                                         mapping),
2328                                          sizeof *mad_priv -
2329                                            sizeof mad_priv->header,
2330                                          DMA_FROM_DEVICE);
2331                         kmem_cache_free(ib_mad_cache, mad_priv);
2332                         printk(KERN_ERR PFX "ib_post_recv failed: %d\n", ret);
2333                         break;
2334                 }
2335         } while (post);
2336
2337         return ret;
2338 }
2339
2340 /*
2341  * Return all the posted receive MADs
2342  */
2343 static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info)
2344 {
2345         struct ib_mad_private_header *mad_priv_hdr;
2346         struct ib_mad_private *recv;
2347         struct ib_mad_list_head *mad_list;
2348
2349         while (!list_empty(&qp_info->recv_queue.list)) {
2350
2351                 mad_list = list_entry(qp_info->recv_queue.list.next,
2352                                       struct ib_mad_list_head, list);
2353                 mad_priv_hdr = container_of(mad_list,
2354                                             struct ib_mad_private_header,
2355                                             mad_list);
2356                 recv = container_of(mad_priv_hdr, struct ib_mad_private,
2357                                     header);
2358
2359                 /* Remove from posted receive MAD list */
2360                 list_del(&mad_list->list);
2361
2362                 dma_unmap_single(qp_info->port_priv->device->dma_device,
2363                                  pci_unmap_addr(&recv->header, mapping),
2364                                  sizeof(struct ib_mad_private) -
2365                                  sizeof(struct ib_mad_private_header),
2366                                  DMA_FROM_DEVICE);
2367                 kmem_cache_free(ib_mad_cache, recv);
2368         }
2369
2370         qp_info->recv_queue.count = 0;
2371 }
2372
2373 /*
2374  * Start the port
2375  */
2376 static int ib_mad_port_start(struct ib_mad_port_private *port_priv)
2377 {
2378         int ret, i;
2379         struct ib_qp_attr *attr;
2380         struct ib_qp *qp;
2381
2382         attr = kmalloc(sizeof *attr, GFP_KERNEL);
2383         if (!attr) {
2384                 printk(KERN_ERR PFX "Couldn't kmalloc ib_qp_attr\n");
2385                 return -ENOMEM;
2386         }
2387
2388         for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2389                 qp = port_priv->qp_info[i].qp;
2390                 /*
2391                  * PKey index for QP1 is irrelevant but
2392                  * one is needed for the Reset to Init transition
2393                  */
2394                 attr->qp_state = IB_QPS_INIT;
2395                 attr->pkey_index = 0;
2396                 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY;
2397                 ret = ib_modify_qp(qp, attr, IB_QP_STATE |
2398                                              IB_QP_PKEY_INDEX | IB_QP_QKEY);
2399                 if (ret) {
2400                         printk(KERN_ERR PFX "Couldn't change QP%d state to "
2401                                "INIT: %d\n", i, ret);
2402                         goto out;
2403                 }
2404
2405                 attr->qp_state = IB_QPS_RTR;
2406                 ret = ib_modify_qp(qp, attr, IB_QP_STATE);
2407                 if (ret) {
2408                         printk(KERN_ERR PFX "Couldn't change QP%d state to "
2409                                "RTR: %d\n", i, ret);
2410                         goto out;
2411                 }
2412
2413                 attr->qp_state = IB_QPS_RTS;
2414                 attr->sq_psn = IB_MAD_SEND_Q_PSN;
2415                 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN);
2416                 if (ret) {
2417                         printk(KERN_ERR PFX "Couldn't change QP%d state to "
2418                                "RTS: %d\n", i, ret);
2419                         goto out;
2420                 }
2421         }
2422
2423         ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2424         if (ret) {
2425                 printk(KERN_ERR PFX "Failed to request completion "
2426                        "notification: %d\n", ret);
2427                 goto out;
2428         }
2429
2430         for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2431                 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
2432                 if (ret) {
2433                         printk(KERN_ERR PFX "Couldn't post receive WRs\n");
2434                         goto out;
2435                 }
2436         }
2437 out:
2438         kfree(attr);
2439         return ret;
2440 }
2441
2442 static void qp_event_handler(struct ib_event *event, void *qp_context)
2443 {
2444         struct ib_mad_qp_info   *qp_info = qp_context;
2445
2446         /* It's worse than that! He's dead, Jim! */
2447         printk(KERN_ERR PFX "Fatal error (%d) on MAD QP (%d)\n",
2448                 event->event, qp_info->qp->qp_num);
2449 }
2450
2451 static void init_mad_queue(struct ib_mad_qp_info *qp_info,
2452                            struct ib_mad_queue *mad_queue)
2453 {
2454         mad_queue->qp_info = qp_info;
2455         mad_queue->count = 0;
2456         spin_lock_init(&mad_queue->lock);
2457         INIT_LIST_HEAD(&mad_queue->list);
2458 }
2459
2460 static void init_mad_qp(struct ib_mad_port_private *port_priv,
2461                         struct ib_mad_qp_info *qp_info)
2462 {
2463         qp_info->port_priv = port_priv;
2464         init_mad_queue(qp_info, &qp_info->send_queue);
2465         init_mad_queue(qp_info, &qp_info->recv_queue);
2466         INIT_LIST_HEAD(&qp_info->overflow_list);
2467         spin_lock_init(&qp_info->snoop_lock);
2468         qp_info->snoop_table = NULL;
2469         qp_info->snoop_table_size = 0;
2470         atomic_set(&qp_info->snoop_count, 0);
2471 }
2472
2473 static int create_mad_qp(struct ib_mad_qp_info *qp_info,
2474                          enum ib_qp_type qp_type)
2475 {
2476         struct ib_qp_init_attr  qp_init_attr;
2477         int ret;
2478
2479         memset(&qp_init_attr, 0, sizeof qp_init_attr);
2480         qp_init_attr.send_cq = qp_info->port_priv->cq;
2481         qp_init_attr.recv_cq = qp_info->port_priv->cq;
2482         qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
2483         qp_init_attr.cap.max_send_wr = IB_MAD_QP_SEND_SIZE;
2484         qp_init_attr.cap.max_recv_wr = IB_MAD_QP_RECV_SIZE;
2485         qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG;
2486         qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG;
2487         qp_init_attr.qp_type = qp_type;
2488         qp_init_attr.port_num = qp_info->port_priv->port_num;
2489         qp_init_attr.qp_context = qp_info;
2490         qp_init_attr.event_handler = qp_event_handler;
2491         qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr);
2492         if (IS_ERR(qp_info->qp)) {
2493                 printk(KERN_ERR PFX "Couldn't create ib_mad QP%d\n",
2494                        get_spl_qp_index(qp_type));
2495                 ret = PTR_ERR(qp_info->qp);
2496                 goto error;
2497         }
2498         /* Use minimum queue sizes unless the CQ is resized */
2499         qp_info->send_queue.max_active = IB_MAD_QP_SEND_SIZE;
2500         qp_info->recv_queue.max_active = IB_MAD_QP_RECV_SIZE;
2501         return 0;
2502
2503 error:
2504         return ret;
2505 }
2506
2507 static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
2508 {
2509         ib_destroy_qp(qp_info->qp);
2510         if (qp_info->snoop_table)
2511                 kfree(qp_info->snoop_table);
2512 }
2513
2514 /*
2515  * Open the port
2516  * Create the QP, PD, MR, and CQ if needed
2517  */
2518 static int ib_mad_port_open(struct ib_device *device,
2519                             int port_num)
2520 {
2521         int ret, cq_size;
2522         struct ib_mad_port_private *port_priv;
2523         unsigned long flags;
2524         char name[sizeof "ib_mad123"];
2525
2526         /* Create new device info */
2527         port_priv = kmalloc(sizeof *port_priv, GFP_KERNEL);
2528         if (!port_priv) {
2529                 printk(KERN_ERR PFX "No memory for ib_mad_port_private\n");
2530                 return -ENOMEM;
2531         }
2532         memset(port_priv, 0, sizeof *port_priv);
2533         port_priv->device = device;
2534         port_priv->port_num = port_num;
2535         spin_lock_init(&port_priv->reg_lock);
2536         INIT_LIST_HEAD(&port_priv->agent_list);
2537         init_mad_qp(port_priv, &port_priv->qp_info[0]);
2538         init_mad_qp(port_priv, &port_priv->qp_info[1]);
2539
2540         cq_size = (IB_MAD_QP_SEND_SIZE + IB_MAD_QP_RECV_SIZE) * 2;
2541         port_priv->cq = ib_create_cq(port_priv->device,
2542                                      ib_mad_thread_completion_handler,
2543                                      NULL, port_priv, cq_size);
2544         if (IS_ERR(port_priv->cq)) {
2545                 printk(KERN_ERR PFX "Couldn't create ib_mad CQ\n");
2546                 ret = PTR_ERR(port_priv->cq);
2547                 goto error3;
2548         }
2549
2550         port_priv->pd = ib_alloc_pd(device);
2551         if (IS_ERR(port_priv->pd)) {
2552                 printk(KERN_ERR PFX "Couldn't create ib_mad PD\n");
2553                 ret = PTR_ERR(port_priv->pd);
2554                 goto error4;
2555         }
2556
2557         port_priv->mr = ib_get_dma_mr(port_priv->pd, IB_ACCESS_LOCAL_WRITE);
2558         if (IS_ERR(port_priv->mr)) {
2559                 printk(KERN_ERR PFX "Couldn't get ib_mad DMA MR\n");
2560                 ret = PTR_ERR(port_priv->mr);
2561                 goto error5;
2562         }
2563
2564         ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
2565         if (ret)
2566                 goto error6;
2567         ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI);
2568         if (ret)
2569                 goto error7;
2570
2571         snprintf(name, sizeof name, "ib_mad%d", port_num);
2572         port_priv->wq = create_singlethread_workqueue(name);
2573         if (!port_priv->wq) {
2574                 ret = -ENOMEM;
2575                 goto error8;
2576         }
2577         INIT_WORK(&port_priv->work, ib_mad_completion_handler, port_priv);
2578
2579         ret = ib_mad_port_start(port_priv);
2580         if (ret) {
2581                 printk(KERN_ERR PFX "Couldn't start port\n");
2582                 goto error9;
2583         }
2584
2585         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2586         list_add_tail(&port_priv->port_list, &ib_mad_port_list);
2587         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2588         return 0;
2589
2590 error9:
2591         destroy_workqueue(port_priv->wq);
2592 error8:
2593         destroy_mad_qp(&port_priv->qp_info[1]);
2594 error7:
2595         destroy_mad_qp(&port_priv->qp_info[0]);
2596 error6:
2597         ib_dereg_mr(port_priv->mr);
2598 error5:
2599         ib_dealloc_pd(port_priv->pd);
2600 error4:
2601         ib_destroy_cq(port_priv->cq);
2602         cleanup_recv_queue(&port_priv->qp_info[1]);
2603         cleanup_recv_queue(&port_priv->qp_info[0]);
2604 error3:
2605         kfree(port_priv);
2606
2607         return ret;
2608 }
2609
2610 /*
2611  * Close the port
2612  * If there are no classes using the port, free the port
2613  * resources (CQ, MR, PD, QP) and remove the port's info structure
2614  */
2615 static int ib_mad_port_close(struct ib_device *device, int port_num)
2616 {
2617         struct ib_mad_port_private *port_priv;
2618         unsigned long flags;
2619
2620         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2621         port_priv = __ib_get_mad_port(device, port_num);
2622         if (port_priv == NULL) {
2623                 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2624                 printk(KERN_ERR PFX "Port %d not found\n", port_num);
2625                 return -ENODEV;
2626         }
2627         list_del(&port_priv->port_list);
2628         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2629
2630         /* Stop processing completions. */
2631         flush_workqueue(port_priv->wq);
2632         destroy_workqueue(port_priv->wq);
2633         destroy_mad_qp(&port_priv->qp_info[1]);
2634         destroy_mad_qp(&port_priv->qp_info[0]);
2635         ib_dereg_mr(port_priv->mr);
2636         ib_dealloc_pd(port_priv->pd);
2637         ib_destroy_cq(port_priv->cq);
2638         cleanup_recv_queue(&port_priv->qp_info[1]);
2639         cleanup_recv_queue(&port_priv->qp_info[0]);
2640         /* XXX: Handle deallocation of MAD registration tables */
2641
2642         kfree(port_priv);
2643
2644         return 0;
2645 }
2646
2647 static void ib_mad_init_device(struct ib_device *device)
2648 {
2649         int start, end, i;
2650
2651         if (device->node_type == IB_NODE_SWITCH) {
2652                 start = 0;
2653                 end   = 0;
2654         } else {
2655                 start = 1;
2656                 end   = device->phys_port_cnt;
2657         }
2658
2659         for (i = start; i <= end; i++) {
2660                 if (ib_mad_port_open(device, i)) {
2661                         printk(KERN_ERR PFX "Couldn't open %s port %d\n",
2662                                device->name, i);
2663                         goto error;
2664                 }
2665                 if (ib_agent_port_open(device, i)) {
2666                         printk(KERN_ERR PFX "Couldn't open %s port %d "
2667                                "for agents\n",
2668                                device->name, i);
2669                         goto error_agent;
2670                 }
2671         }
2672         return;
2673
2674 error_agent:
2675         if (ib_mad_port_close(device, i))
2676                 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2677                        device->name, i);
2678
2679 error:
2680         i--;
2681
2682         while (i >= start) {
2683                 if (ib_agent_port_close(device, i))
2684                         printk(KERN_ERR PFX "Couldn't close %s port %d "
2685                                "for agents\n",
2686                                device->name, i);
2687                 if (ib_mad_port_close(device, i))
2688                         printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2689                                device->name, i);
2690                 i--;
2691         }
2692 }
2693
2694 static void ib_mad_remove_device(struct ib_device *device)
2695 {
2696         int i, num_ports, cur_port;
2697
2698         if (device->node_type == IB_NODE_SWITCH) {
2699                 num_ports = 1;
2700                 cur_port = 0;
2701         } else {
2702                 num_ports = device->phys_port_cnt;
2703                 cur_port = 1;
2704         }
2705         for (i = 0; i < num_ports; i++, cur_port++) {
2706                 if (ib_agent_port_close(device, cur_port))
2707                         printk(KERN_ERR PFX "Couldn't close %s port %d "
2708                                "for agents\n",
2709                                device->name, cur_port);
2710                 if (ib_mad_port_close(device, cur_port))
2711                         printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2712                                device->name, cur_port);
2713         }
2714 }
2715
2716 static struct ib_client mad_client = {
2717         .name   = "mad",
2718         .add = ib_mad_init_device,
2719         .remove = ib_mad_remove_device
2720 };
2721
2722 static int __init ib_mad_init_module(void)
2723 {
2724         int ret;
2725
2726         spin_lock_init(&ib_mad_port_list_lock);
2727
2728         ib_mad_cache = kmem_cache_create("ib_mad",
2729                                          sizeof(struct ib_mad_private),
2730                                          0,
2731                                          SLAB_HWCACHE_ALIGN,
2732                                          NULL,
2733                                          NULL);
2734         if (!ib_mad_cache) {
2735                 printk(KERN_ERR PFX "Couldn't create ib_mad cache\n");
2736                 ret = -ENOMEM;
2737                 goto error1;
2738         }
2739
2740         INIT_LIST_HEAD(&ib_mad_port_list);
2741
2742         if (ib_register_client(&mad_client)) {
2743                 printk(KERN_ERR PFX "Couldn't register ib_mad client\n");
2744                 ret = -EINVAL;
2745                 goto error2;
2746         }
2747
2748         return 0;
2749
2750 error2:
2751         kmem_cache_destroy(ib_mad_cache);
2752 error1:
2753         return ret;
2754 }
2755
2756 static void __exit ib_mad_cleanup_module(void)
2757 {
2758         ib_unregister_client(&mad_client);
2759
2760         if (kmem_cache_destroy(ib_mad_cache)) {
2761                 printk(KERN_DEBUG PFX "Failed to destroy ib_mad cache\n");
2762         }
2763 }
2764
2765 module_init(ib_mad_init_module);
2766 module_exit(ib_mad_cleanup_module);
2767