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

   1 /*
   2  * Copyright (c) 2004, 2005 Voltaire, Inc. All rights reserved.
   3  * Copyright (c) 2005 Intel Corporation.  All rights reserved.
   4  * Copyright (c) 2005 Mellanox Technologies Ltd.  All rights reserved.
   5  *
   6  * This software is available to you under a choice of one of two
   7  * licenses.  You may choose to be licensed under the terms of the GNU
   8  * General Public License (GPL) Version 2, available from the file
   9  * COPYING in the main directory of this source tree, or the
  10  * OpenIB.org BSD license below:
  11  *
  12  *     Redistribution and use in source and binary forms, with or
  13  *     without modification, are permitted provided that the following
  14  *     conditions are met:
  15  *
  16  *      - Redistributions of source code must retain the above
  17  *        copyright notice, this list of conditions and the following
  18  *        disclaimer.
  19  *
  20  *      - Redistributions in binary form must reproduce the above
  21  *        copyright notice, this list of conditions and the following
  22  *        disclaimer in the documentation and/or other materials
  23  *        provided with the distribution.
  24  *
  25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  32  * SOFTWARE.
  33  *
  34  * $Id: mad.c 2817 2005-07-07 11:29:26Z halr $
  35  */
  36 #include <linux/dma-mapping.h>
  37
  38 #include "mad_priv.h"
  39 #include "mad_rmpp.h"
  40 #include "smi.h"
  41 #include "agent.h"
  42
  43 MODULE_LICENSE("Dual BSD/GPL");
  44 MODULE_DESCRIPTION("kernel IB MAD API");
  45 MODULE_AUTHOR("Hal Rosenstock");
  46 MODULE_AUTHOR("Sean Hefty");
  47
  48
  49 kmem_cache_t *ib_mad_cache;
  50
  51 static struct list_head ib_mad_port_list;
  52 static u32 ib_mad_client_id = 0;
  53
  54 /* Port list lock */
  55 static spinlock_t ib_mad_port_list_lock;
  56
  57
  58 /* Forward declarations */
  59 static int method_in_use(struct ib_mad_mgmt_method_table **method,
  60                          struct ib_mad_reg_req *mad_reg_req);
  61 static void remove_mad_reg_req(struct ib_mad_agent_private *priv);
  62 static struct ib_mad_agent_private *find_mad_agent(
  63                                         struct ib_mad_port_private *port_priv,
  64                                         struct ib_mad *mad);
  65 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
  66                                     struct ib_mad_private *mad);
  67 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv);
  68 static void timeout_sends(void *data);
  69 static void local_completions(void *data);
  70 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
  71                               struct ib_mad_agent_private *agent_priv,
  72                               u8 mgmt_class);
  73 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
  74                            struct ib_mad_agent_private *agent_priv);
  75
  76 /*
  77  * Returns a ib_mad_port_private structure or NULL for a device/port
  78  * Assumes ib_mad_port_list_lock is being held
  79  */
  80 static inline struct ib_mad_port_private *
  81 __ib_get_mad_port(struct ib_device *device, int port_num)
  82 {
  83         struct ib_mad_port_private *entry;
  84
  85         list_for_each_entry(entry, &ib_mad_port_list, port_list) {
  86                 if (entry->device == device && entry->port_num == port_num)
  87                         return entry;
  88         }
  89         return NULL;
  90 }
  91
  92 /*
  93  * Wrapper function to return a ib_mad_port_private structure or NULL
  94  * for a device/port
  95  */
  96 static inline struct ib_mad_port_private *
  97 ib_get_mad_port(struct ib_device *device, int port_num)
  98 {
  99         struct ib_mad_port_private *entry;
 100         unsigned long flags;
 101
 102         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
 103         entry = __ib_get_mad_port(device, port_num);
 104         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
 105
 106         return entry;
 107 }
 108
 109 static inline u8 convert_mgmt_class(u8 mgmt_class)
 110 {
 111         /* Alias IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE to 0 */
 112         return mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE ?
 113                 0 : mgmt_class;
 114 }
 115
 116 static int get_spl_qp_index(enum ib_qp_type qp_type)
 117 {
 118         switch (qp_type)
 119         {
 120         case IB_QPT_SMI:
 121                 return 0;
 122         case IB_QPT_GSI:
 123                 return 1;
 124         default:
 125                 return -1;
 126         }
 127 }
 128
 129 static int vendor_class_index(u8 mgmt_class)
 130 {
 131         return mgmt_class - IB_MGMT_CLASS_VENDOR_RANGE2_START;
 132 }
 133
 134 static int is_vendor_class(u8 mgmt_class)
 135 {
 136         if ((mgmt_class < IB_MGMT_CLASS_VENDOR_RANGE2_START) ||
 137             (mgmt_class > IB_MGMT_CLASS_VENDOR_RANGE2_END))
 138                 return 0;
 139         return 1;
 140 }
 141
 142 static int is_vendor_oui(char *oui)
 143 {
 144         if (oui[0] || oui[1] || oui[2])
 145                 return 1;
 146         return 0;
 147 }
 148
 149 static int is_vendor_method_in_use(
 150                 struct ib_mad_mgmt_vendor_class *vendor_class,
 151                 struct ib_mad_reg_req *mad_reg_req)
 152 {
 153         struct ib_mad_mgmt_method_table *method;
 154         int i;
 155
 156         for (i = 0; i < MAX_MGMT_OUI; i++) {
 157                 if (!memcmp(vendor_class->oui[i], mad_reg_req->oui, 3)) {
 158                         method = vendor_class->method_table[i];
 159                         if (method) {
 160                                 if (method_in_use(&method, mad_reg_req))
 161                                         return 1;
 162                                 else
 163                                         break;
 164                         }
 165                 }
 166         }
 167         return 0;
 168 }
 169
 170 /*
 171  * ib_register_mad_agent - Register to send/receive MADs
 172  */
 173 struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
 174                                            u8 port_num,
 175                                            enum ib_qp_type qp_type,
 176                                            struct ib_mad_reg_req *mad_reg_req,
 177                                            u8 rmpp_version,
 178                                            ib_mad_send_handler send_handler,
 179                                            ib_mad_recv_handler recv_handler,
 180                                            void *context)
 181 {
 182         struct ib_mad_port_private *port_priv;
 183         struct ib_mad_agent *ret = ERR_PTR(-EINVAL);
 184         struct ib_mad_agent_private *mad_agent_priv;
 185         struct ib_mad_reg_req *reg_req = NULL;
 186         struct ib_mad_mgmt_class_table *class;
 187         struct ib_mad_mgmt_vendor_class_table *vendor;
 188         struct ib_mad_mgmt_vendor_class *vendor_class;
 189         struct ib_mad_mgmt_method_table *method;
 190         int ret2, qpn;
 191         unsigned long flags;
 192         u8 mgmt_class, vclass;
 193
 194         /* Validate parameters */
 195         qpn = get_spl_qp_index(qp_type);
 196         if (qpn == -1)
 197                 goto error1;
 198
 199         if (rmpp_version && rmpp_version != IB_MGMT_RMPP_VERSION)
 200                 goto error1;
 201
 202         /* Validate MAD registration request if supplied */
 203         if (mad_reg_req) {
 204                 if (mad_reg_req->mgmt_class_version >= MAX_MGMT_VERSION)
 205                         goto error1;
 206                 if (!recv_handler)
 207                         goto error1;
 208                 if (mad_reg_req->mgmt_class >= MAX_MGMT_CLASS) {
 209                         /*
 210                          * IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE is the only
 211                          * one in this range currently allowed
 212                          */
 213                         if (mad_reg_req->mgmt_class !=
 214                             IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
 215                                 goto error1;
 216                 } else if (mad_reg_req->mgmt_class == 0) {
 217                         /*
 218                          * Class 0 is reserved in IBA and is used for
 219                          * aliasing of IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE
 220                          */
 221                         goto error1;
 222                 } else if (is_vendor_class(mad_reg_req->mgmt_class)) {
 223                         /*
 224                          * If class is in "new" vendor range,
 225                          * ensure supplied OUI is not zero
 226                          */
 227                         if (!is_vendor_oui(mad_reg_req->oui))
 228                                 goto error1;
 229                 }
 230                 /* Make sure class supplied is consistent with QP type */
 231                 if (qp_type == IB_QPT_SMI) {
 232                         if ((mad_reg_req->mgmt_class !=
 233                                         IB_MGMT_CLASS_SUBN_LID_ROUTED) &&
 234                             (mad_reg_req->mgmt_class !=
 235                                         IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
 236                                 goto error1;
 237                 } else {
 238                         if ((mad_reg_req->mgmt_class ==
 239                                         IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
 240                             (mad_reg_req->mgmt_class ==
 241                                         IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
 242                                 goto error1;
 243                 }
 244         } else {
 245                 /* No registration request supplied */
 246                 if (!send_handler)
 247                         goto error1;
 248         }
 249
 250         /* Validate device and port */
 251         port_priv = ib_get_mad_port(device, port_num);
 252         if (!port_priv) {
 253                 ret = ERR_PTR(-ENODEV);
 254                 goto error1;
 255         }
 256
 257         /* Allocate structures */
 258         mad_agent_priv = 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_send_wr *send_wr,
 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_wr, 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_smp *smp,
 658                                   struct ib_send_wr *send_wr)
 659 {
 660         int ret;
 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
 670         if (!smi_handle_dr_smp_send(smp, device->node_type, port_num)) {
 671                 ret = -EINVAL;
 672                 printk(KERN_ERR PFX "Invalid directed route\n");
 673                 goto out;
 674         }
 675         /* Check to post send on QP or process locally */
 676         ret = smi_check_local_dr_smp(smp, device, port_num);
 677         if (!ret || !device->process_mad)
 678                 goto out;
 679
 680         local = kmalloc(sizeof *local, GFP_ATOMIC);
 681         if (!local) {
 682                 ret = -ENOMEM;
 683                 printk(KERN_ERR PFX "No memory for ib_mad_local_private\n");
 684                 goto out;
 685         }
 686         local->mad_priv = NULL;
 687         local->recv_mad_agent = NULL;
 688         mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_ATOMIC);
 689         if (!mad_priv) {
 690                 ret = -ENOMEM;
 691                 printk(KERN_ERR PFX "No memory for local response MAD\n");
 692                 kfree(local);
 693                 goto out;
 694         }
 695
 696         build_smp_wc(send_wr->wr_id, be16_to_cpu(smp->dr_slid),
 697                      send_wr->wr.ud.pkey_index,
 698                      send_wr->wr.ud.port_num, &mad_wc);
 699
 700         /* No GRH for DR SMP */
 701         ret = device->process_mad(device, 0, port_num, &mad_wc, NULL,
 702                                   (struct ib_mad *)smp,
 703                                   (struct ib_mad *)&mad_priv->mad);
 704         switch (ret)
 705         {
 706         case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
 707                 if (response_mad(&mad_priv->mad.mad) &&
 708                     mad_agent_priv->agent.recv_handler) {
 709                         local->mad_priv = mad_priv;
 710                         local->recv_mad_agent = mad_agent_priv;
 711                         /*
 712                          * Reference MAD agent until receive
 713                          * side of local completion handled
 714                          */
 715                         atomic_inc(&mad_agent_priv->refcount);
 716                 } else
 717                         kmem_cache_free(ib_mad_cache, mad_priv);
 718                 break;
 719         case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
 720                 kmem_cache_free(ib_mad_cache, mad_priv);
 721                 break;
 722         case IB_MAD_RESULT_SUCCESS:
 723                 /* Treat like an incoming receive MAD */
 724                 port_priv = ib_get_mad_port(mad_agent_priv->agent.device,
 725                                             mad_agent_priv->agent.port_num);
 726                 if (port_priv) {
 727                         mad_priv->mad.mad.mad_hdr.tid =
 728                                 ((struct ib_mad *)smp)->mad_hdr.tid;
 729                         recv_mad_agent = find_mad_agent(port_priv,
 730                                                         &mad_priv->mad.mad);
 731                 }
 732                 if (!port_priv || !recv_mad_agent) {
 733                         kmem_cache_free(ib_mad_cache, mad_priv);
 734                         kfree(local);
 735                         ret = 0;
 736                         goto out;
 737                 }
 738                 local->mad_priv = mad_priv;
 739                 local->recv_mad_agent = recv_mad_agent;
 740                 break;
 741         default:
 742                 kmem_cache_free(ib_mad_cache, mad_priv);
 743                 kfree(local);
 744                 ret = -EINVAL;
 745                 goto out;
 746         }
 747
 748         local->send_wr = *send_wr;
 749         local->send_wr.sg_list = local->sg_list;
 750         memcpy(local->sg_list, send_wr->sg_list,
 751                sizeof *send_wr->sg_list * send_wr->num_sge);
 752         local->send_wr.next = NULL;
 753         local->tid = send_wr->wr.ud.mad_hdr->tid;
 754         local->wr_id = send_wr->wr_id;
 755         /* Reference MAD agent until send side of local completion handled */
 756         atomic_inc(&mad_agent_priv->refcount);
 757         /* Queue local completion to local list */
 758         spin_lock_irqsave(&mad_agent_priv->lock, flags);
 759         list_add_tail(&local->completion_list, &mad_agent_priv->local_list);
 760         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
 761         queue_work(mad_agent_priv->qp_info->port_priv->wq,
 762                    &mad_agent_priv->local_work);
 763         ret = 1;
 764 out:
 765         return ret;
 766 }
 767
 768 static int get_buf_length(int hdr_len, int data_len)
 769 {
 770         int seg_size, pad;
 771
 772         seg_size = sizeof(struct ib_mad) - hdr_len;
 773         if (data_len && seg_size) {
 774                 pad = seg_size - data_len % seg_size;
 775                 if (pad == seg_size)
 776                         pad = 0;
 777         } else
 778                 pad = seg_size;
 779         return hdr_len + data_len + pad;
 780 }
 781
 782 struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
 783                                             u32 remote_qpn, u16 pkey_index,
 784                                             struct ib_ah *ah, int rmpp_active,
 785                                             int hdr_len, int data_len,
 786                                             unsigned int __nocast gfp_mask)
 787 {
 788         struct ib_mad_agent_private *mad_agent_priv;
 789         struct ib_mad_send_buf *send_buf;
 790         int buf_size;
 791         void *buf;
 792
 793         mad_agent_priv = container_of(mad_agent,
 794                                       struct ib_mad_agent_private, agent);
 795         buf_size = get_buf_length(hdr_len, data_len);
 796
 797         if ((!mad_agent->rmpp_version &&
 798              (rmpp_active || buf_size > sizeof(struct ib_mad))) ||
 799             (!rmpp_active && buf_size > sizeof(struct ib_mad)))
 800                 return ERR_PTR(-EINVAL);
 801
 802         buf = kmalloc(sizeof *send_buf + buf_size, gfp_mask);
 803         if (!buf)
 804                 return ERR_PTR(-ENOMEM);
 805         memset(buf, 0, sizeof *send_buf + buf_size);
 806
 807         send_buf = buf + buf_size;
 808         send_buf->mad = buf;
 809
 810         send_buf->sge.addr = dma_map_single(mad_agent->device->dma_device,
 811                                             buf, buf_size, DMA_TO_DEVICE);
 812         pci_unmap_addr_set(send_buf, mapping, send_buf->sge.addr);
 813         send_buf->sge.length = buf_size;
 814         send_buf->sge.lkey = mad_agent->mr->lkey;
 815
 816         send_buf->send_wr.wr_id = (unsigned long) send_buf;
 817         send_buf->send_wr.sg_list = &send_buf->sge;
 818         send_buf->send_wr.num_sge = 1;
 819         send_buf->send_wr.opcode = IB_WR_SEND;
 820         send_buf->send_wr.send_flags = IB_SEND_SIGNALED;
 821         send_buf->send_wr.wr.ud.ah = ah;
 822         send_buf->send_wr.wr.ud.mad_hdr = &send_buf->mad->mad_hdr;
 823         send_buf->send_wr.wr.ud.remote_qpn = remote_qpn;
 824         send_buf->send_wr.wr.ud.remote_qkey = IB_QP_SET_QKEY;
 825         send_buf->send_wr.wr.ud.pkey_index = pkey_index;
 826
 827         if (rmpp_active) {
 828                 struct ib_rmpp_mad *rmpp_mad;
 829                 rmpp_mad = (struct ib_rmpp_mad *)send_buf->mad;
 830                 rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(hdr_len -
 831                         offsetof(struct ib_rmpp_mad, data) + data_len);
 832                 rmpp_mad->rmpp_hdr.rmpp_version = mad_agent->rmpp_version;
 833                 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA;
 834                 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr,
 835                                   IB_MGMT_RMPP_FLAG_ACTIVE);
 836         }
 837
 838         send_buf->mad_agent = mad_agent;
 839         atomic_inc(&mad_agent_priv->refcount);
 840         return send_buf;
 841 }
 842 EXPORT_SYMBOL(ib_create_send_mad);
 843
 844 void ib_free_send_mad(struct ib_mad_send_buf *send_buf)
 845 {
 846         struct ib_mad_agent_private *mad_agent_priv;
 847
 848         mad_agent_priv = container_of(send_buf->mad_agent,
 849                                       struct ib_mad_agent_private, agent);
 850
 851         dma_unmap_single(send_buf->mad_agent->device->dma_device,
 852                          pci_unmap_addr(send_buf, mapping),
 853                          send_buf->sge.length, DMA_TO_DEVICE);
 854         kfree(send_buf->mad);
 855
 856         if (atomic_dec_and_test(&mad_agent_priv->refcount))
 857                 wake_up(&mad_agent_priv->wait);
 858 }
 859 EXPORT_SYMBOL(ib_free_send_mad);
 860
 861 int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr)
 862 {
 863         struct ib_mad_qp_info *qp_info;
 864         struct ib_send_wr *bad_send_wr;
 865         struct list_head *list;
 866         unsigned long flags;
 867         int ret;
 868
 869         /* Set WR ID to find mad_send_wr upon completion */
 870         qp_info = mad_send_wr->mad_agent_priv->qp_info;
 871         mad_send_wr->send_wr.wr_id = (unsigned long)&mad_send_wr->mad_list;
 872         mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;
 873
 874         spin_lock_irqsave(&qp_info->send_queue.lock, flags);
 875         if (qp_info->send_queue.count < qp_info->send_queue.max_active) {
 876                 ret = ib_post_send(mad_send_wr->mad_agent_priv->agent.qp,
 877                                    &mad_send_wr->send_wr, &bad_send_wr);
 878                 list = &qp_info->send_queue.list;
 879         } else {
 880                 ret = 0;
 881                 list = &qp_info->overflow_list;
 882         }
 883
 884         if (!ret) {
 885                 qp_info->send_queue.count++;
 886                 list_add_tail(&mad_send_wr->mad_list.list, list);
 887         }
 888         spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
 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_agent *mad_agent,
 897                      struct ib_send_wr *send_wr,
 898                      struct ib_send_wr **bad_send_wr)
 899 {
 900         int ret = -EINVAL;
 901         struct ib_mad_agent_private *mad_agent_priv;
 902
 903         /* Validate supplied parameters */
 904         if (!bad_send_wr)
 905                 goto error1;
 906
 907         if (!mad_agent || !send_wr)
 908                 goto error2;
 909
 910         if (!mad_agent->send_handler)
 911                 goto error2;
 912
 913         mad_agent_priv = container_of(mad_agent,
 914                                       struct ib_mad_agent_private,
 915                                       agent);
 916
 917         /* Walk list of send WRs and post each on send list */
 918         while (send_wr) {
 919                 unsigned long                   flags;
 920                 struct ib_send_wr               *next_send_wr;
 921                 struct ib_mad_send_wr_private   *mad_send_wr;
 922                 struct ib_smp                   *smp;
 923
 924                 /* Validate more parameters */
 925                 if (send_wr->num_sge > IB_MAD_SEND_REQ_MAX_SG)
 926                         goto error2;
 927
 928                 if (send_wr->wr.ud.timeout_ms && !mad_agent->recv_handler)
 929                         goto error2;
 930
 931                 if (!send_wr->wr.ud.mad_hdr) {
 932                         printk(KERN_ERR PFX "MAD header must be supplied "
 933                                "in WR %p\n", send_wr);
 934                         goto error2;
 935                 }
 936
 937                 /*
 938                  * Save pointer to next work request to post in case the
 939                  * current one completes, and the user modifies the work
 940                  * request associated with the completion
 941                  */
 942                 next_send_wr = (struct ib_send_wr *)send_wr->next;
 943
 944                 smp = (struct ib_smp *)send_wr->wr.ud.mad_hdr;
 945                 if (smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
 946                         ret = handle_outgoing_dr_smp(mad_agent_priv, smp,
 947                                                      send_wr);
 948                         if (ret < 0)            /* error */
 949                                 goto error2;
 950                         else if (ret == 1)      /* locally consumed */
 951                                 goto next;
 952                 }
 953
 954                 /* Allocate MAD send WR tracking structure */
 955                 mad_send_wr = kmalloc(sizeof *mad_send_wr, GFP_ATOMIC);
 956                 if (!mad_send_wr) {
 957                         printk(KERN_ERR PFX "No memory for "
 958                                "ib_mad_send_wr_private\n");
 959                         ret = -ENOMEM;
 960                         goto error2;
 961                 }
 962                 memset(mad_send_wr, 0, sizeof *mad_send_wr);
 963
 964                 mad_send_wr->send_wr = *send_wr;
 965                 mad_send_wr->send_wr.sg_list = mad_send_wr->sg_list;
 966                 memcpy(mad_send_wr->sg_list, send_wr->sg_list,
 967                        sizeof *send_wr->sg_list * send_wr->num_sge);
 968                 mad_send_wr->wr_id = send_wr->wr_id;
 969                 mad_send_wr->tid = send_wr->wr.ud.mad_hdr->tid;
 970                 mad_send_wr->mad_agent_priv = mad_agent_priv;
 971                 /* Timeout will be updated after send completes */
 972                 mad_send_wr->timeout = msecs_to_jiffies(send_wr->wr.
 973                                                         ud.timeout_ms);
 974                 mad_send_wr->retries = mad_send_wr->send_wr.wr.ud.retries;
 975                 /* One reference for each work request to QP + response */
 976                 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0);
 977                 mad_send_wr->status = IB_WC_SUCCESS;
 978
 979                 /* Reference MAD agent until send completes */
 980                 atomic_inc(&mad_agent_priv->refcount);
 981                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
 982                 list_add_tail(&mad_send_wr->agent_list,
 983                               &mad_agent_priv->send_list);
 984                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
 985
 986                 if (mad_agent_priv->agent.rmpp_version) {
 987                         ret = ib_send_rmpp_mad(mad_send_wr);
 988                         if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED)
 989                                 ret = ib_send_mad(mad_send_wr);
 990                 } else
 991                         ret = ib_send_mad(mad_send_wr);
 992                 if (ret < 0) {
 993                         /* Fail send request */
 994                         spin_lock_irqsave(&mad_agent_priv->lock, flags);
 995                         list_del(&mad_send_wr->agent_list);
 996                         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
 997                         atomic_dec(&mad_agent_priv->refcount);
 998                         goto error2;
 999                 }
1000 next:
1001                 send_wr = next_send_wr;
1002         }
1003         return 0;
1004
1005 error2:
1006         *bad_send_wr = send_wr;
1007 error1:
1008         return ret;
1009 }
1010 EXPORT_SYMBOL(ib_post_send_mad);
1011
1012 /*
1013  * ib_free_recv_mad - Returns data buffers used to receive
1014  *  a MAD to the access layer
1015  */
1016 void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc)
1017 {
1018         struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf;
1019         struct ib_mad_private_header *mad_priv_hdr;
1020         struct ib_mad_private *priv;
1021         struct list_head free_list;
1022
1023         INIT_LIST_HEAD(&free_list);
1024         list_splice_init(&mad_recv_wc->rmpp_list, &free_list);
1025
1026         list_for_each_entry_safe(mad_recv_buf, temp_recv_buf,
1027                                         &free_list, list) {
1028                 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc,
1029                                            recv_buf);
1030                 mad_priv_hdr = container_of(mad_recv_wc,
1031                                             struct ib_mad_private_header,
1032                                             recv_wc);
1033                 priv = container_of(mad_priv_hdr, struct ib_mad_private,
1034                                     header);
1035                 kmem_cache_free(ib_mad_cache, priv);
1036         }
1037 }
1038 EXPORT_SYMBOL(ib_free_recv_mad);
1039
1040 struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
1041                                         u8 rmpp_version,
1042                                         ib_mad_send_handler send_handler,
1043                                         ib_mad_recv_handler recv_handler,
1044                                         void *context)
1045 {
1046         return ERR_PTR(-EINVAL);        /* XXX: for now */
1047 }
1048 EXPORT_SYMBOL(ib_redirect_mad_qp);
1049
1050 int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
1051                       struct ib_wc *wc)
1052 {
1053         printk(KERN_ERR PFX "ib_process_mad_wc() not implemented yet\n");
1054         return 0;
1055 }
1056 EXPORT_SYMBOL(ib_process_mad_wc);
1057
1058 static int method_in_use(struct ib_mad_mgmt_method_table **method,
1059                          struct ib_mad_reg_req *mad_reg_req)
1060 {
1061         int i;
1062
1063         for (i = find_first_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS);
1064              i < IB_MGMT_MAX_METHODS;
1065              i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1066                                1+i)) {
1067                 if ((*method)->agent[i]) {
1068                         printk(KERN_ERR PFX "Method %d already in use\n", i);
1069                         return -EINVAL;
1070                 }
1071         }
1072         return 0;
1073 }
1074
1075 static int allocate_method_table(struct ib_mad_mgmt_method_table **method)
1076 {
1077         /* Allocate management method table */
1078         *method = kmalloc(sizeof **method, GFP_ATOMIC);
1079         if (!*method) {
1080                 printk(KERN_ERR PFX "No memory for "
1081                        "ib_mad_mgmt_method_table\n");
1082                 return -ENOMEM;
1083         }
1084         /* Clear management method table */
1085         memset(*method, 0, sizeof **method);
1086
1087         return 0;
1088 }
1089
1090 /*
1091  * Check to see if there are any methods still in use
1092  */
1093 static int check_method_table(struct ib_mad_mgmt_method_table *method)
1094 {
1095         int i;
1096
1097         for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
1098                 if (method->agent[i])
1099                         return 1;
1100         return 0;
1101 }
1102
1103 /*
1104  * Check to see if there are any method tables for this class still in use
1105  */
1106 static int check_class_table(struct ib_mad_mgmt_class_table *class)
1107 {
1108         int i;
1109
1110         for (i = 0; i < MAX_MGMT_CLASS; i++)
1111                 if (class->method_table[i])
1112                         return 1;
1113         return 0;
1114 }
1115
1116 static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class)
1117 {
1118         int i;
1119
1120         for (i = 0; i < MAX_MGMT_OUI; i++)
1121                 if (vendor_class->method_table[i])
1122                         return 1;
1123         return 0;
1124 }
1125
1126 static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class,
1127                            char *oui)
1128 {
1129         int i;
1130
1131         for (i = 0; i < MAX_MGMT_OUI; i++)
1132                 /* Is there matching OUI for this vendor class ? */
1133                 if (!memcmp(vendor_class->oui[i], oui, 3))
1134                         return i;
1135
1136         return -1;
1137 }
1138
1139 static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor)
1140 {
1141         int i;
1142
1143         for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++)
1144                 if (vendor->vendor_class[i])
1145                         return 1;
1146
1147         return 0;
1148 }
1149
1150 static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method,
1151                                      struct ib_mad_agent_private *agent)
1152 {
1153         int i;
1154
1155         /* Remove any methods for this mad agent */
1156         for (i = 0; i < IB_MGMT_MAX_METHODS; i++) {
1157                 if (method->agent[i] == agent) {
1158                         method->agent[i] = NULL;
1159                 }
1160         }
1161 }
1162
1163 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1164                               struct ib_mad_agent_private *agent_priv,
1165                               u8 mgmt_class)
1166 {
1167         struct ib_mad_port_private *port_priv;
1168         struct ib_mad_mgmt_class_table **class;
1169         struct ib_mad_mgmt_method_table **method;
1170         int i, ret;
1171
1172         port_priv = agent_priv->qp_info->port_priv;
1173         class = &port_priv->version[mad_reg_req->mgmt_class_version].class;
1174         if (!*class) {
1175                 /* Allocate management class table for "new" class version */
1176                 *class = kmalloc(sizeof **class, GFP_ATOMIC);
1177                 if (!*class) {
1178                         printk(KERN_ERR PFX "No memory for "
1179                                "ib_mad_mgmt_class_table\n");
1180                         ret = -ENOMEM;
1181                         goto error1;
1182                 }
1183                 /* Clear management class table */
1184                 memset(*class, 0, sizeof(**class));
1185                 /* Allocate method table for this management class */
1186                 method = &(*class)->method_table[mgmt_class];
1187                 if ((ret = allocate_method_table(method)))
1188                         goto error2;
1189         } else {
1190                 method = &(*class)->method_table[mgmt_class];
1191                 if (!*method) {
1192                         /* Allocate method table for this management class */
1193                         if ((ret = allocate_method_table(method)))
1194                                 goto error1;
1195                 }
1196         }
1197
1198         /* Now, make sure methods are not already in use */
1199         if (method_in_use(method, mad_reg_req))
1200                 goto error3;
1201
1202         /* Finally, add in methods being registered */
1203         for (i = find_first_bit(mad_reg_req->method_mask,
1204                                 IB_MGMT_MAX_METHODS);
1205              i < IB_MGMT_MAX_METHODS;
1206              i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1207                                1+i)) {
1208                 (*method)->agent[i] = agent_priv;
1209         }
1210         return 0;
1211
1212 error3:
1213         /* Remove any methods for this mad agent */
1214         remove_methods_mad_agent(*method, agent_priv);
1215         /* Now, check to see if there are any methods in use */
1216         if (!check_method_table(*method)) {
1217                 /* If not, release management method table */
1218                 kfree(*method);
1219                 *method = NULL;
1220         }
1221         ret = -EINVAL;
1222         goto error1;
1223 error2:
1224         kfree(*class);
1225         *class = NULL;
1226 error1:
1227         return ret;
1228 }
1229
1230 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1231                            struct ib_mad_agent_private *agent_priv)
1232 {
1233         struct ib_mad_port_private *port_priv;
1234         struct ib_mad_mgmt_vendor_class_table **vendor_table;
1235         struct ib_mad_mgmt_vendor_class_table *vendor = NULL;
1236         struct ib_mad_mgmt_vendor_class *vendor_class = NULL;
1237         struct ib_mad_mgmt_method_table **method;
1238         int i, ret = -ENOMEM;
1239         u8 vclass;
1240
1241         /* "New" vendor (with OUI) class */
1242         vclass = vendor_class_index(mad_reg_req->mgmt_class);
1243         port_priv = agent_priv->qp_info->port_priv;
1244         vendor_table = &port_priv->version[
1245                                 mad_reg_req->mgmt_class_version].vendor;
1246         if (!*vendor_table) {
1247                 /* Allocate mgmt vendor class table for "new" class version */
1248                 vendor = kmalloc(sizeof *vendor, GFP_ATOMIC);
1249                 if (!vendor) {
1250                         printk(KERN_ERR PFX "No memory for "
1251                                "ib_mad_mgmt_vendor_class_table\n");
1252                         goto error1;
1253                 }
1254                 /* Clear management vendor class table */
1255                 memset(vendor, 0, sizeof(*vendor));
1256                 *vendor_table = vendor;
1257         }
1258         if (!(*vendor_table)->vendor_class[vclass]) {
1259                 /* Allocate table for this management vendor class */
1260                 vendor_class = kmalloc(sizeof *vendor_class, GFP_ATOMIC);
1261                 if (!vendor_class) {
1262                         printk(KERN_ERR PFX "No memory for "
1263                                "ib_mad_mgmt_vendor_class\n");
1264                         goto error2;
1265                 }
1266                 memset(vendor_class, 0, sizeof(*vendor_class));
1267                 (*vendor_table)->vendor_class[vclass] = vendor_class;
1268         }
1269         for (i = 0; i < MAX_MGMT_OUI; i++) {
1270                 /* Is there matching OUI for this vendor class ? */
1271                 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i],
1272                             mad_reg_req->oui, 3)) {
1273                         method = &(*vendor_table)->vendor_class[
1274                                                 vclass]->method_table[i];
1275                         BUG_ON(!*method);
1276                         goto check_in_use;
1277                 }
1278         }
1279         for (i = 0; i < MAX_MGMT_OUI; i++) {
1280                 /* OUI slot available ? */
1281                 if (!is_vendor_oui((*vendor_table)->vendor_class[
1282                                 vclass]->oui[i])) {
1283                         method = &(*vendor_table)->vendor_class[
1284                                 vclass]->method_table[i];
1285                         BUG_ON(*method);
1286                         /* Allocate method table for this OUI */
1287                         if ((ret = allocate_method_table(method)))
1288                                 goto error3;
1289                         memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
1290                                mad_reg_req->oui, 3);
1291                         goto check_in_use;
1292                 }
1293         }
1294         printk(KERN_ERR PFX "All OUI slots in use\n");
1295         goto error3;
1296
1297 check_in_use:
1298         /* Now, make sure methods are not already in use */
1299         if (method_in_use(method, mad_reg_req))
1300                 goto error4;
1301
1302         /* Finally, add in methods being registered */
1303         for (i = find_first_bit(mad_reg_req->method_mask,
1304                                 IB_MGMT_MAX_METHODS);
1305              i < IB_MGMT_MAX_METHODS;
1306              i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1307                                1+i)) {
1308                 (*method)->agent[i] = agent_priv;
1309         }
1310         return 0;
1311
1312 error4:
1313         /* Remove any methods for this mad agent */
1314         remove_methods_mad_agent(*method, agent_priv);
1315         /* Now, check to see if there are any methods in use */
1316         if (!check_method_table(*method)) {
1317                 /* If not, release management method table */
1318                 kfree(*method);
1319                 *method = NULL;
1320         }
1321         ret = -EINVAL;
1322 error3:
1323         if (vendor_class) {
1324                 (*vendor_table)->vendor_class[vclass] = NULL;
1325                 kfree(vendor_class);
1326         }
1327 error2:
1328         if (vendor) {
1329                 *vendor_table = NULL;
1330                 kfree(vendor);
1331         }
1332 error1:
1333         return ret;
1334 }
1335
1336 static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv)
1337 {
1338         struct ib_mad_port_private *port_priv;
1339         struct ib_mad_mgmt_class_table *class;
1340         struct ib_mad_mgmt_method_table *method;
1341         struct ib_mad_mgmt_vendor_class_table *vendor;
1342         struct ib_mad_mgmt_vendor_class *vendor_class;
1343         int index;
1344         u8 mgmt_class;
1345
1346         /*
1347          * Was MAD registration request supplied
1348          * with original registration ?
1349          */
1350         if (!agent_priv->reg_req) {
1351                 goto out;
1352         }
1353
1354         port_priv = agent_priv->qp_info->port_priv;
1355         mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class);
1356         class = port_priv->version[
1357                         agent_priv->reg_req->mgmt_class_version].class;
1358         if (!class)
1359                 goto vendor_check;
1360
1361         method = class->method_table[mgmt_class];
1362         if (method) {
1363                 /* Remove any methods for this mad agent */
1364                 remove_methods_mad_agent(method, agent_priv);
1365                 /* Now, check to see if there are any methods still in use */
1366                 if (!check_method_table(method)) {
1367                         /* If not, release management method table */
1368                          kfree(method);
1369                          class->method_table[mgmt_class] = NULL;
1370                          /* Any management classes left ? */
1371                         if (!check_class_table(class)) {
1372                                 /* If not, release management class table */
1373                                 kfree(class);
1374                                 port_priv->version[
1375                                         agent_priv->reg_req->
1376                                         mgmt_class_version].class = NULL;
1377                         }
1378                 }
1379         }
1380
1381 vendor_check:
1382         if (!is_vendor_class(mgmt_class))
1383                 goto out;
1384
1385         /* normalize mgmt_class to vendor range 2 */
1386         mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class);
1387         vendor = port_priv->version[
1388                         agent_priv->reg_req->mgmt_class_version].vendor;
1389
1390         if (!vendor)
1391                 goto out;
1392
1393         vendor_class = vendor->vendor_class[mgmt_class];
1394         if (vendor_class) {
1395                 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui);
1396                 if (index < 0)
1397                         goto out;
1398                 method = vendor_class->method_table[index];
1399                 if (method) {
1400                         /* Remove any methods for this mad agent */
1401                         remove_methods_mad_agent(method, agent_priv);
1402                         /*
1403                          * Now, check to see if there are
1404                          * any methods still in use
1405                          */
1406                         if (!check_method_table(method)) {
1407                                 /* If not, release management method table */
1408                                 kfree(method);
1409                                 vendor_class->method_table[index] = NULL;
1410                                 memset(vendor_class->oui[index], 0, 3);
1411                                 /* Any OUIs left ? */
1412                                 if (!check_vendor_class(vendor_class)) {
1413                                         /* If not, release vendor class table */
1414                                         kfree(vendor_class);
1415                                         vendor->vendor_class[mgmt_class] = NULL;
1416                                         /* Any other vendor classes left ? */
1417                                         if (!check_vendor_table(vendor)) {
1418                                                 kfree(vendor);
1419                                                 port_priv->version[
1420                                                         agent_priv->reg_req->
1421                                                         mgmt_class_version].
1422                                                         vendor = NULL;
1423                                         }
1424                                 }
1425                         }
1426                 }
1427         }
1428
1429 out:
1430         return;
1431 }
1432
1433 static struct ib_mad_agent_private *
1434 find_mad_agent(struct ib_mad_port_private *port_priv,
1435                struct ib_mad *mad)
1436 {
1437         struct ib_mad_agent_private *mad_agent = NULL;
1438         unsigned long flags;
1439
1440         spin_lock_irqsave(&port_priv->reg_lock, flags);
1441         if (response_mad(mad)) {
1442                 u32 hi_tid;
1443                 struct ib_mad_agent_private *entry;
1444
1445                 /*
1446                  * Routing is based on high 32 bits of transaction ID
1447                  * of MAD.
1448                  */
1449                 hi_tid = be64_to_cpu(mad->mad_hdr.tid) >> 32;
1450                 list_for_each_entry(entry, &port_priv->agent_list,
1451                                     agent_list) {
1452                         if (entry->agent.hi_tid == hi_tid) {
1453                                 mad_agent = entry;
1454                                 break;
1455                         }
1456                 }
1457         } else {
1458                 struct ib_mad_mgmt_class_table *class;
1459                 struct ib_mad_mgmt_method_table *method;
1460                 struct ib_mad_mgmt_vendor_class_table *vendor;
1461                 struct ib_mad_mgmt_vendor_class *vendor_class;
1462                 struct ib_vendor_mad *vendor_mad;
1463                 int index;
1464
1465                 /*
1466                  * Routing is based on version, class, and method
1467                  * For "newer" vendor MADs, also based on OUI
1468                  */
1469                 if (mad->mad_hdr.class_version >= MAX_MGMT_VERSION)
1470                         goto out;
1471                 if (!is_vendor_class(mad->mad_hdr.mgmt_class)) {
1472                         class = port_priv->version[
1473                                         mad->mad_hdr.class_version].class;
1474                         if (!class)
1475                                 goto out;
1476                         method = class->method_table[convert_mgmt_class(
1477                                                         mad->mad_hdr.mgmt_class)];
1478                         if (method)
1479                                 mad_agent = method->agent[mad->mad_hdr.method &
1480                                                           ~IB_MGMT_METHOD_RESP];
1481                 } else {
1482                         vendor = port_priv->version[
1483                                         mad->mad_hdr.class_version].vendor;
1484                         if (!vendor)
1485                                 goto out;
1486                         vendor_class = vendor->vendor_class[vendor_class_index(
1487                                                 mad->mad_hdr.mgmt_class)];
1488                         if (!vendor_class)
1489                                 goto out;
1490                         /* Find matching OUI */
1491                         vendor_mad = (struct ib_vendor_mad *)mad;
1492                         index = find_vendor_oui(vendor_class, vendor_mad->oui);
1493                         if (index == -1)
1494                                 goto out;
1495                         method = vendor_class->method_table[index];
1496                         if (method) {
1497                                 mad_agent = method->agent[mad->mad_hdr.method &
1498                                                           ~IB_MGMT_METHOD_RESP];
1499                         }
1500                 }
1501         }
1502
1503         if (mad_agent) {
1504                 if (mad_agent->agent.recv_handler)
1505                         atomic_inc(&mad_agent->refcount);
1506                 else {
1507                         printk(KERN_NOTICE PFX "No receive handler for client "
1508                                "%p on port %d\n",
1509                                &mad_agent->agent, port_priv->port_num);
1510                         mad_agent = NULL;
1511                 }
1512         }
1513 out:
1514         spin_unlock_irqrestore(&port_priv->reg_lock, flags);
1515
1516         return mad_agent;
1517 }
1518
1519 static int validate_mad(struct ib_mad *mad, u32 qp_num)
1520 {
1521         int valid = 0;
1522
1523         /* Make sure MAD base version is understood */
1524         if (mad->mad_hdr.base_version != IB_MGMT_BASE_VERSION) {
1525                 printk(KERN_ERR PFX "MAD received with unsupported base "
1526                        "version %d\n", mad->mad_hdr.base_version);
1527                 goto out;
1528         }
1529
1530         /* Filter SMI packets sent to other than QP0 */
1531         if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
1532             (mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
1533                 if (qp_num == 0)
1534                         valid = 1;
1535         } else {
1536                 /* Filter GSI packets sent to QP0 */
1537                 if (qp_num != 0)
1538                         valid = 1;
1539         }
1540
1541 out:
1542         return valid;
1543 }
1544
1545 static int is_data_mad(struct ib_mad_agent_private *mad_agent_priv,
1546                        struct ib_mad_hdr *mad_hdr)
1547 {
1548         struct ib_rmpp_mad *rmpp_mad;
1549
1550         rmpp_mad = (struct ib_rmpp_mad *)mad_hdr;
1551         return !mad_agent_priv->agent.rmpp_version ||
1552                 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
1553                                     IB_MGMT_RMPP_FLAG_ACTIVE) ||
1554                 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA);
1555 }
1556
1557 struct ib_mad_send_wr_private*
1558 ib_find_send_mad(struct ib_mad_agent_private *mad_agent_priv, __be64 tid)
1559 {
1560         struct ib_mad_send_wr_private *mad_send_wr;
1561
1562         list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
1563                             agent_list) {
1564                 if (mad_send_wr->tid == tid)
1565                         return mad_send_wr;
1566         }
1567
1568         /*
1569          * It's possible to receive the response before we've
1570          * been notified that the send has completed
1571          */
1572         list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
1573                             agent_list) {
1574                 if (is_data_mad(mad_agent_priv,
1575                                 mad_send_wr->send_wr.wr.ud.mad_hdr) &&
1576                     mad_send_wr->tid == tid && mad_send_wr->timeout) {
1577                         /* Verify request has not been canceled */
1578                         return (mad_send_wr->status == IB_WC_SUCCESS) ?
1579                                 mad_send_wr : NULL;
1580                 }
1581         }
1582         return NULL;
1583 }
1584
1585 void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr)
1586 {
1587         mad_send_wr->timeout = 0;
1588         if (mad_send_wr->refcount == 1) {
1589                 list_del(&mad_send_wr->agent_list);
1590                 list_add_tail(&mad_send_wr->agent_list,
1591                               &mad_send_wr->mad_agent_priv->done_list);
1592         }
1593 }
1594
1595 static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
1596                                  struct ib_mad_recv_wc *mad_recv_wc)
1597 {
1598         struct ib_mad_send_wr_private *mad_send_wr;
1599         struct ib_mad_send_wc mad_send_wc;
1600         unsigned long flags;
1601         __be64 tid;
1602
1603         INIT_LIST_HEAD(&mad_recv_wc->rmpp_list);
1604         list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list);
1605         if (mad_agent_priv->agent.rmpp_version) {
1606                 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv,
1607                                                       mad_recv_wc);
1608                 if (!mad_recv_wc) {
1609                         if (atomic_dec_and_test(&mad_agent_priv->refcount))
1610                                 wake_up(&mad_agent_priv->wait);
1611                         return;
1612                 }
1613         }
1614
1615         /* Complete corresponding request */
1616         if (response_mad(mad_recv_wc->recv_buf.mad)) {
1617                 tid = mad_recv_wc->recv_buf.mad->mad_hdr.tid;
1618                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1619                 mad_send_wr = ib_find_send_mad(mad_agent_priv, tid);
1620                 if (!mad_send_wr) {
1621                         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1622                         ib_free_recv_mad(mad_recv_wc);
1623                         if (atomic_dec_and_test(&mad_agent_priv->refcount))
1624                                 wake_up(&mad_agent_priv->wait);
1625                         return;
1626                 }
1627                 ib_mark_mad_done(mad_send_wr);
1628                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1629
1630                 /* Defined behavior is to complete response before request */
1631                 mad_recv_wc->wc->wr_id = mad_send_wr->wr_id;
1632                 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1633                                                    mad_recv_wc);
1634                 atomic_dec(&mad_agent_priv->refcount);
1635
1636                 mad_send_wc.status = IB_WC_SUCCESS;
1637                 mad_send_wc.vendor_err = 0;
1638                 mad_send_wc.wr_id = mad_send_wr->wr_id;
1639                 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
1640         } else {
1641                 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1642                                                    mad_recv_wc);
1643                 if (atomic_dec_and_test(&mad_agent_priv->refcount))
1644                         wake_up(&mad_agent_priv->wait);
1645         }
1646 }
1647
1648 static void ib_mad_recv_done_handler(struct ib_mad_port_private *port_priv,
1649                                      struct ib_wc *wc)
1650 {
1651         struct ib_mad_qp_info *qp_info;
1652         struct ib_mad_private_header *mad_priv_hdr;
1653         struct ib_mad_private *recv, *response;
1654         struct ib_mad_list_head *mad_list;
1655         struct ib_mad_agent_private *mad_agent;
1656
1657         response = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
1658         if (!response)
1659                 printk(KERN_ERR PFX "ib_mad_recv_done_handler no memory "
1660                        "for response buffer\n");
1661
1662         mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
1663         qp_info = mad_list->mad_queue->qp_info;
1664         dequeue_mad(mad_list);
1665
1666         mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header,
1667                                     mad_list);
1668         recv = container_of(mad_priv_hdr, struct ib_mad_private, header);
1669         dma_unmap_single(port_priv->device->dma_device,
1670                          pci_unmap_addr(&recv->header, mapping),
1671                          sizeof(struct ib_mad_private) -
1672                          sizeof(struct ib_mad_private_header),
1673                          DMA_FROM_DEVICE);
1674
1675         /* Setup MAD receive work completion from "normal" work completion */
1676         recv->header.wc = *wc;
1677         recv->header.recv_wc.wc = &recv->header.wc;
1678         recv->header.recv_wc.mad_len = sizeof(struct ib_mad);
1679         recv->header.recv_wc.recv_buf.mad = &recv->mad.mad;
1680         recv->header.recv_wc.recv_buf.grh = &recv->grh;
1681
1682         if (atomic_read(&qp_info->snoop_count))
1683                 snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS);
1684
1685         /* Validate MAD */
1686         if (!validate_mad(&recv->mad.mad, qp_info->qp->qp_num))
1687                 goto out;
1688
1689         if (recv->mad.mad.mad_hdr.mgmt_class ==
1690             IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1691                 if (!smi_handle_dr_smp_recv(&recv->mad.smp,
1692                                             port_priv->device->node_type,
1693                                             port_priv->port_num,
1694                                             port_priv->device->phys_port_cnt))
1695                         goto out;
1696                 if (!smi_check_forward_dr_smp(&recv->mad.smp))
1697                         goto local;
1698                 if (!smi_handle_dr_smp_send(&recv->mad.smp,
1699                                             port_priv->device->node_type,
1700                                             port_priv->port_num))
1701                         goto out;
1702                 if (!smi_check_local_dr_smp(&recv->mad.smp,
1703                                             port_priv->device,
1704                                             port_priv->port_num))
1705                         goto out;
1706         }
1707
1708 local:
1709         /* Give driver "right of first refusal" on incoming MAD */
1710         if (port_priv->device->process_mad) {
1711                 int ret;
1712
1713                 if (!response) {
1714                         printk(KERN_ERR PFX "No memory for response MAD\n");
1715                         /*
1716                          * Is it better to assume that
1717                          * it wouldn't be processed ?
1718                          */
1719                         goto out;
1720                 }
1721
1722                 ret = port_priv->device->process_mad(port_priv->device, 0,
1723                                                      port_priv->port_num,
1724                                                      wc, &recv->grh,
1725                                                      &recv->mad.mad,
1726                                                      &response->mad.mad);
1727                 if (ret & IB_MAD_RESULT_SUCCESS) {
1728                         if (ret & IB_MAD_RESULT_CONSUMED)
1729                                 goto out;
1730                         if (ret & IB_MAD_RESULT_REPLY) {
1731                                 /* Send response */
1732                                 if (!agent_send(response, &recv->grh, wc,
1733                                                 port_priv->device,
1734                                                 port_priv->port_num))
1735                                         response = NULL;
1736                                 goto out;
1737                         }
1738                 }
1739         }
1740
1741         mad_agent = find_mad_agent(port_priv, &recv->mad.mad);
1742         if (mad_agent) {
1743                 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
1744                 /*
1745                  * recv is freed up in error cases in ib_mad_complete_recv
1746                  * or via recv_handler in ib_mad_complete_recv()
1747                  */
1748                 recv = NULL;
1749         }
1750
1751 out:
1752         /* Post another receive request for this QP */
1753         if (response) {
1754                 ib_mad_post_receive_mads(qp_info, response);
1755                 if (recv)
1756                         kmem_cache_free(ib_mad_cache, recv);
1757         } else
1758                 ib_mad_post_receive_mads(qp_info, recv);
1759 }
1760
1761 static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
1762 {
1763         struct ib_mad_send_wr_private *mad_send_wr;
1764         unsigned long delay;
1765
1766         if (list_empty(&mad_agent_priv->wait_list)) {
1767                 cancel_delayed_work(&mad_agent_priv->timed_work);
1768         } else {
1769                 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
1770                                          struct ib_mad_send_wr_private,
1771                                          agent_list);
1772
1773                 if (time_after(mad_agent_priv->timeout,
1774                                mad_send_wr->timeout)) {
1775                         mad_agent_priv->timeout = mad_send_wr->timeout;
1776                         cancel_delayed_work(&mad_agent_priv->timed_work);
1777                         delay = mad_send_wr->timeout - jiffies;
1778                         if ((long)delay <= 0)
1779                                 delay = 1;
1780                         queue_delayed_work(mad_agent_priv->qp_info->
1781                                            port_priv->wq,
1782                                            &mad_agent_priv->timed_work, delay);
1783                 }
1784         }
1785 }
1786
1787 static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
1788 {
1789         struct ib_mad_agent_private *mad_agent_priv;
1790         struct ib_mad_send_wr_private *temp_mad_send_wr;
1791         struct list_head *list_item;
1792         unsigned long delay;
1793
1794         mad_agent_priv = mad_send_wr->mad_agent_priv;
1795         list_del(&mad_send_wr->agent_list);
1796
1797         delay = mad_send_wr->timeout;
1798         mad_send_wr->timeout += jiffies;
1799
1800         if (delay) {
1801                 list_for_each_prev(list_item, &mad_agent_priv->wait_list) {
1802                         temp_mad_send_wr = list_entry(list_item,
1803                                                 struct ib_mad_send_wr_private,
1804                                                 agent_list);
1805                         if (time_after(mad_send_wr->timeout,
1806                                        temp_mad_send_wr->timeout))
1807                                 break;
1808                 }
1809         }
1810         else
1811                 list_item = &mad_agent_priv->wait_list;
1812         list_add(&mad_send_wr->agent_list, list_item);
1813
1814         /* Reschedule a work item if we have a shorter timeout */
1815         if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list) {
1816                 cancel_delayed_work(&mad_agent_priv->timed_work);
1817                 queue_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
1818                                    &mad_agent_priv->timed_work, delay);
1819         }
1820 }
1821
1822 void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr,
1823                           int timeout_ms)
1824 {
1825         mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
1826         wait_for_response(mad_send_wr);
1827 }
1828
1829 /*
1830  * Process a send work completion
1831  */
1832 void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
1833                              struct ib_mad_send_wc *mad_send_wc)
1834 {
1835         struct ib_mad_agent_private     *mad_agent_priv;
1836         unsigned long                   flags;
1837         int                             ret;
1838
1839         mad_agent_priv = mad_send_wr->mad_agent_priv;
1840         spin_lock_irqsave(&mad_agent_priv->lock, flags);
1841         if (mad_agent_priv->agent.rmpp_version) {
1842                 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc);
1843                 if (ret == IB_RMPP_RESULT_CONSUMED)
1844                         goto done;
1845         } else
1846                 ret = IB_RMPP_RESULT_UNHANDLED;
1847
1848         if (mad_send_wc->status != IB_WC_SUCCESS &&
1849             mad_send_wr->status == IB_WC_SUCCESS) {
1850                 mad_send_wr->status = mad_send_wc->status;
1851                 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
1852         }
1853
1854         if (--mad_send_wr->refcount > 0) {
1855                 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout &&
1856                     mad_send_wr->status == IB_WC_SUCCESS) {
1857                         wait_for_response(mad_send_wr);
1858                 }
1859                 goto done;
1860         }
1861
1862         /* Remove send from MAD agent and notify client of completion */
1863         list_del(&mad_send_wr->agent_list);
1864         adjust_timeout(mad_agent_priv);
1865         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1866
1867         if (mad_send_wr->status != IB_WC_SUCCESS )
1868                 mad_send_wc->status = mad_send_wr->status;
1869         if (ret != IB_RMPP_RESULT_INTERNAL)
1870                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
1871                                                    mad_send_wc);
1872
1873         /* Release reference on agent taken when sending */
1874         if (atomic_dec_and_test(&mad_agent_priv->refcount))
1875                 wake_up(&mad_agent_priv->wait);
1876
1877         kfree(mad_send_wr);
1878         return;
1879 done:
1880         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1881 }
1882
1883 static void ib_mad_send_done_handler(struct ib_mad_port_private *port_priv,
1884                                      struct ib_wc *wc)
1885 {
1886         struct ib_mad_send_wr_private   *mad_send_wr, *queued_send_wr;
1887         struct ib_mad_list_head         *mad_list;
1888         struct ib_mad_qp_info           *qp_info;
1889         struct ib_mad_queue             *send_queue;
1890         struct ib_send_wr               *bad_send_wr;
1891         unsigned long flags;
1892         int ret;
1893
1894         mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
1895         mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
1896                                    mad_list);
1897         send_queue = mad_list->mad_queue;
1898         qp_info = send_queue->qp_info;
1899
1900 retry:
1901         queued_send_wr = NULL;
1902         spin_lock_irqsave(&send_queue->lock, flags);
1903         list_del(&mad_list->list);
1904
1905         /* Move queued send to the send queue */
1906         if (send_queue->count-- > send_queue->max_active) {
1907                 mad_list = container_of(qp_info->overflow_list.next,
1908                                         struct ib_mad_list_head, list);
1909                 queued_send_wr = container_of(mad_list,
1910                                         struct ib_mad_send_wr_private,
1911                                         mad_list);
1912                 list_del(&mad_list->list);
1913                 list_add_tail(&mad_list->list, &send_queue->list);
1914         }
1915         spin_unlock_irqrestore(&send_queue->lock, flags);
1916
1917         /* Restore client wr_id in WC and complete send */
1918         wc->wr_id = mad_send_wr->wr_id;
1919         if (atomic_read(&qp_info->snoop_count))
1920                 snoop_send(qp_info, &mad_send_wr->send_wr,
1921                            (struct ib_mad_send_wc *)wc,
1922                            IB_MAD_SNOOP_SEND_COMPLETIONS);
1923         ib_mad_complete_send_wr(mad_send_wr, (struct ib_mad_send_wc *)wc);
1924
1925         if (queued_send_wr) {
1926                 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr,
1927                                 &bad_send_wr);
1928                 if (ret) {
1929                         printk(KERN_ERR PFX "ib_post_send failed: %d\n", ret);
1930                         mad_send_wr = queued_send_wr;
1931                         wc->status = IB_WC_LOC_QP_OP_ERR;
1932                         goto retry;
1933                 }
1934         }
1935 }
1936
1937 static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info)
1938 {
1939         struct ib_mad_send_wr_private *mad_send_wr;
1940         struct ib_mad_list_head *mad_list;
1941         unsigned long flags;
1942
1943         spin_lock_irqsave(&qp_info->send_queue.lock, flags);
1944         list_for_each_entry(mad_list, &qp_info->send_queue.list, list) {
1945                 mad_send_wr = container_of(mad_list,
1946                                            struct ib_mad_send_wr_private,
1947                                            mad_list);
1948                 mad_send_wr->retry = 1;
1949         }
1950         spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
1951 }
1952
1953 static void mad_error_handler(struct ib_mad_port_private *port_priv,
1954                               struct ib_wc *wc)
1955 {
1956         struct ib_mad_list_head *mad_list;
1957         struct ib_mad_qp_info *qp_info;
1958         struct ib_mad_send_wr_private *mad_send_wr;
1959         int ret;
1960
1961         /* Determine if failure was a send or receive */
1962         mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
1963         qp_info = mad_list->mad_queue->qp_info;
1964         if (mad_list->mad_queue == &qp_info->recv_queue)
1965                 /*
1966                  * Receive errors indicate that the QP has entered the error
1967                  * state - error handling/shutdown code will cleanup
1968                  */
1969                 return;
1970
1971         /*
1972          * Send errors will transition the QP to SQE - move
1973          * QP to RTS and repost flushed work requests
1974          */
1975         mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
1976                                    mad_list);
1977         if (wc->status == IB_WC_WR_FLUSH_ERR) {
1978                 if (mad_send_wr->retry) {
1979                         /* Repost send */
1980                         struct ib_send_wr *bad_send_wr;
1981
1982                         mad_send_wr->retry = 0;
1983                         ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr,
1984                                         &bad_send_wr);
1985                         if (ret)
1986                                 ib_mad_send_done_handler(port_priv, wc);
1987                 } else
1988                         ib_mad_send_done_handler(port_priv, wc);
1989         } else {
1990                 struct ib_qp_attr *attr;
1991
1992                 /* Transition QP to RTS and fail offending send */
1993                 attr = kmalloc(sizeof *attr, GFP_KERNEL);
1994                 if (attr) {
1995                         attr->qp_state = IB_QPS_RTS;
1996                         attr->cur_qp_state = IB_QPS_SQE;
1997                         ret = ib_modify_qp(qp_info->qp, attr,
1998                                            IB_QP_STATE | IB_QP_CUR_STATE);
1999                         kfree(attr);
2000                         if (ret)
2001                                 printk(KERN_ERR PFX "mad_error_handler - "
2002                                        "ib_modify_qp to RTS : %d\n", ret);
2003                         else
2004                                 mark_sends_for_retry(qp_info);
2005                 }
2006                 ib_mad_send_done_handler(port_priv, wc);
2007         }
2008 }
2009
2010 /*
2011  * IB MAD completion callback
2012  */
2013 static void ib_mad_completion_handler(void *data)
2014 {
2015         struct ib_mad_port_private *port_priv;
2016         struct ib_wc wc;
2017
2018         port_priv = (struct ib_mad_port_private *)data;
2019         ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2020
2021         while (ib_poll_cq(port_priv->cq, 1, &wc) == 1) {
2022                 if (wc.status == IB_WC_SUCCESS) {
2023                         switch (wc.opcode) {
2024                         case IB_WC_SEND:
2025                                 ib_mad_send_done_handler(port_priv, &wc);
2026                                 break;
2027                         case IB_WC_RECV:
2028                                 ib_mad_recv_done_handler(port_priv, &wc);
2029                                 break;
2030                         default:
2031                                 BUG_ON(1);
2032                                 break;
2033                         }
2034                 } else
2035                         mad_error_handler(port_priv, &wc);
2036         }
2037 }
2038
2039 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
2040 {
2041         unsigned long flags;
2042         struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr;
2043         struct ib_mad_send_wc mad_send_wc;
2044         struct list_head cancel_list;
2045
2046         INIT_LIST_HEAD(&cancel_list);
2047
2048         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2049         list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2050                                  &mad_agent_priv->send_list, agent_list) {
2051                 if (mad_send_wr->status == IB_WC_SUCCESS) {
2052                         mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2053                         mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2054                 }
2055         }
2056
2057         /* Empty wait list to prevent receives from finding a request */
2058         list_splice_init(&mad_agent_priv->wait_list, &cancel_list);
2059         /* Empty local completion list as well */
2060         list_splice_init(&mad_agent_priv->local_list, &cancel_list);
2061         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2062
2063         /* Report all cancelled requests */
2064         mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
2065         mad_send_wc.vendor_err = 0;
2066
2067         list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2068                                  &cancel_list, agent_list) {
2069                 mad_send_wc.wr_id = mad_send_wr->wr_id;
2070                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2071                                                    &mad_send_wc);
2072
2073                 list_del(&mad_send_wr->agent_list);
2074                 kfree(mad_send_wr);
2075                 atomic_dec(&mad_agent_priv->refcount);
2076         }
2077 }
2078
2079 static struct ib_mad_send_wr_private*
2080 find_send_by_wr_id(struct ib_mad_agent_private *mad_agent_priv, u64 wr_id)
2081 {
2082         struct ib_mad_send_wr_private *mad_send_wr;
2083
2084         list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
2085                             agent_list) {
2086                 if (mad_send_wr->wr_id == wr_id)
2087                         return mad_send_wr;
2088         }
2089
2090         list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
2091                             agent_list) {
2092                 if (is_data_mad(mad_agent_priv,
2093                                 mad_send_wr->send_wr.wr.ud.mad_hdr) &&
2094                     mad_send_wr->wr_id == wr_id)
2095                         return mad_send_wr;
2096         }
2097         return NULL;
2098 }
2099
2100 int ib_modify_mad(struct ib_mad_agent *mad_agent, u64 wr_id, u32 timeout_ms)
2101 {
2102         struct ib_mad_agent_private *mad_agent_priv;
2103         struct ib_mad_send_wr_private *mad_send_wr;
2104         unsigned long flags;
2105         int active;
2106
2107         mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
2108                                       agent);
2109         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2110         mad_send_wr = find_send_by_wr_id(mad_agent_priv, wr_id);
2111         if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) {
2112                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2113                 return -EINVAL;
2114         }
2115
2116         active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1);
2117         if (!timeout_ms) {
2118                 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2119                 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2120         }
2121
2122         mad_send_wr->send_wr.wr.ud.timeout_ms = timeout_ms;
2123         if (active)
2124                 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2125         else
2126                 ib_reset_mad_timeout(mad_send_wr, timeout_ms);
2127
2128         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2129         return 0;
2130 }
2131 EXPORT_SYMBOL(ib_modify_mad);
2132
2133 void ib_cancel_mad(struct ib_mad_agent *mad_agent, u64 wr_id)
2134 {
2135         ib_modify_mad(mad_agent, wr_id, 0);
2136 }
2137 EXPORT_SYMBOL(ib_cancel_mad);
2138
2139 static void local_completions(void *data)
2140 {
2141         struct ib_mad_agent_private *mad_agent_priv;
2142         struct ib_mad_local_private *local;
2143         struct ib_mad_agent_private *recv_mad_agent;
2144         unsigned long flags;
2145         int recv = 0;
2146         struct ib_wc wc;
2147         struct ib_mad_send_wc mad_send_wc;
2148
2149         mad_agent_priv = (struct ib_mad_agent_private *)data;
2150
2151         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2152         while (!list_empty(&mad_agent_priv->local_list)) {
2153                 local = list_entry(mad_agent_priv->local_list.next,
2154                                    struct ib_mad_local_private,
2155                                    completion_list);
2156                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2157                 if (local->mad_priv) {
2158                         recv_mad_agent = local->recv_mad_agent;
2159                         if (!recv_mad_agent) {
2160                                 printk(KERN_ERR PFX "No receive MAD agent for local completion\n");
2161                                 goto local_send_completion;
2162                         }
2163
2164                         recv = 1;
2165                         /*
2166                          * Defined behavior is to complete response
2167                          * before request
2168                          */
2169                         build_smp_wc(local->wr_id,
2170                                      be16_to_cpu(IB_LID_PERMISSIVE),
2171                                      0 /* pkey index */,
2172                                      recv_mad_agent->agent.port_num, &wc);
2173
2174                         local->mad_priv->header.recv_wc.wc = &wc;
2175                         local->mad_priv->header.recv_wc.mad_len =
2176                                                 sizeof(struct ib_mad);
2177                         INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list);
2178                         list_add(&local->mad_priv->header.recv_wc.recv_buf.list,
2179                                  &local->mad_priv->header.recv_wc.rmpp_list);
2180                         local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
2181                         local->mad_priv->header.recv_wc.recv_buf.mad =
2182                                                 &local->mad_priv->mad.mad;
2183                         if (atomic_read(&recv_mad_agent->qp_info->snoop_count))
2184                                 snoop_recv(recv_mad_agent->qp_info,
2185                                           &local->mad_priv->header.recv_wc,
2186                                            IB_MAD_SNOOP_RECVS);
2187                         recv_mad_agent->agent.recv_handler(
2188                                                 &recv_mad_agent->agent,
2189                                                 &local->mad_priv->header.recv_wc);
2190                         spin_lock_irqsave(&recv_mad_agent->lock, flags);
2191                         atomic_dec(&recv_mad_agent->refcount);
2192                         spin_unlock_irqrestore(&recv_mad_agent->lock, flags);
2193                 }
2194
2195 local_send_completion:
2196                 /* Complete send */
2197                 mad_send_wc.status = IB_WC_SUCCESS;
2198                 mad_send_wc.vendor_err = 0;
2199                 mad_send_wc.wr_id = local->wr_id;
2200                 if (atomic_read(&mad_agent_priv->qp_info->snoop_count))
2201                         snoop_send(mad_agent_priv->qp_info, &local->send_wr,
2202                                   &mad_send_wc,
2203                                    IB_MAD_SNOOP_SEND_COMPLETIONS);
2204                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2205                                                    &mad_send_wc);
2206
2207                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2208                 list_del(&local->completion_list);
2209                 atomic_dec(&mad_agent_priv->refcount);
2210                 if (!recv)
2211                         kmem_cache_free(ib_mad_cache, local->mad_priv);
2212                 kfree(local);
2213         }
2214         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2215 }
2216
2217 static int retry_send(struct ib_mad_send_wr_private *mad_send_wr)
2218 {
2219         int ret;
2220
2221         if (!mad_send_wr->retries--)
2222                 return -ETIMEDOUT;
2223
2224         mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_wr.
2225                                                 wr.ud.timeout_ms);
2226
2227         if (mad_send_wr->mad_agent_priv->agent.rmpp_version) {
2228                 ret = ib_retry_rmpp(mad_send_wr);
2229                 switch (ret) {
2230                 case IB_RMPP_RESULT_UNHANDLED:
2231                         ret = ib_send_mad(mad_send_wr);
2232                         break;
2233                 case IB_RMPP_RESULT_CONSUMED:
2234                         ret = 0;
2235                         break;
2236                 default:
2237                         ret = -ECOMM;
2238                         break;
2239                 }
2240         } else
2241                 ret = ib_send_mad(mad_send_wr);
2242
2243         if (!ret) {
2244                 mad_send_wr->refcount++;
2245                 list_add_tail(&mad_send_wr->agent_list,
2246                               &mad_send_wr->mad_agent_priv->send_list);
2247         }
2248         return ret;
2249 }
2250
2251 static void timeout_sends(void *data)
2252 {
2253         struct ib_mad_agent_private *mad_agent_priv;
2254         struct ib_mad_send_wr_private *mad_send_wr;
2255         struct ib_mad_send_wc mad_send_wc;
2256         unsigned long flags, delay;
2257
2258         mad_agent_priv = (struct ib_mad_agent_private *)data;
2259         mad_send_wc.vendor_err = 0;
2260
2261         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2262         while (!list_empty(&mad_agent_priv->wait_list)) {
2263                 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2264                                          struct ib_mad_send_wr_private,
2265                                          agent_list);
2266
2267                 if (time_after(mad_send_wr->timeout, jiffies)) {
2268                         delay = mad_send_wr->timeout - jiffies;
2269                         if ((long)delay <= 0)
2270                                 delay = 1;
2271                         queue_delayed_work(mad_agent_priv->qp_info->
2272                                            port_priv->wq,
2273                                            &mad_agent_priv->timed_work, delay);
2274                         break;
2275                 }
2276
2277                 list_del(&mad_send_wr->agent_list);
2278                 if (mad_send_wr->status == IB_WC_SUCCESS &&
2279                     !retry_send(mad_send_wr))
2280                         continue;
2281
2282                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2283
2284                 if (mad_send_wr->status == IB_WC_SUCCESS)
2285                         mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR;
2286                 else
2287                         mad_send_wc.status = mad_send_wr->status;
2288                 mad_send_wc.wr_id = mad_send_wr->wr_id;
2289                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2290                                                    &mad_send_wc);
2291
2292                 kfree(mad_send_wr);
2293                 atomic_dec(&mad_agent_priv->refcount);
2294                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2295         }
2296         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2297 }
2298
2299 static void ib_mad_thread_completion_handler(struct ib_cq *cq, void *arg)
2300 {
2301         struct ib_mad_port_private *port_priv = cq->cq_context;
2302
2303         queue_work(port_priv->wq, &port_priv->work);
2304 }
2305
2306 /*
2307  * Allocate receive MADs and post receive WRs for them
2308  */
2309 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
2310                                     struct ib_mad_private *mad)
2311 {
2312         unsigned long flags;
2313         int post, ret;
2314         struct ib_mad_private *mad_priv;
2315         struct ib_sge sg_list;
2316         struct ib_recv_wr recv_wr, *bad_recv_wr;
2317         struct ib_mad_queue *recv_queue = &qp_info->recv_queue;
2318
2319         /* Initialize common scatter list fields */
2320         sg_list.length = sizeof *mad_priv - sizeof mad_priv->header;
2321         sg_list.lkey = (*qp_info->port_priv->mr).lkey;
2322
2323         /* Initialize common receive WR fields */
2324         recv_wr.next = NULL;
2325         recv_wr.sg_list = &sg_list;
2326         recv_wr.num_sge = 1;
2327
2328         do {
2329                 /* Allocate and map receive buffer */
2330                 if (mad) {
2331                         mad_priv = mad;
2332                         mad = NULL;
2333                 } else {
2334                         mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
2335                         if (!mad_priv) {
2336                                 printk(KERN_ERR PFX "No memory for receive buffer\n");
2337                                 ret = -ENOMEM;
2338                                 break;
2339                         }
2340                 }
2341                 sg_list.addr = dma_map_single(qp_info->port_priv->
2342                                                 device->dma_device,
2343                                         &mad_priv->grh,
2344                                         sizeof *mad_priv -
2345                                                 sizeof mad_priv->header,
2346                                         DMA_FROM_DEVICE);
2347                 pci_unmap_addr_set(&mad_priv->header, mapping, sg_list.addr);
2348                 recv_wr.wr_id = (unsigned long)&mad_priv->header.mad_list;
2349                 mad_priv->header.mad_list.mad_queue = recv_queue;
2350
2351                 /* Post receive WR */
2352                 spin_lock_irqsave(&recv_queue->lock, flags);
2353                 post = (++recv_queue->count < recv_queue->max_active);
2354                 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list);
2355                 spin_unlock_irqrestore(&recv_queue->lock, flags);
2356                 ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr);
2357                 if (ret) {
2358                         spin_lock_irqsave(&recv_queue->lock, flags);
2359                         list_del(&mad_priv->header.mad_list.list);
2360                         recv_queue->count--;
2361                         spin_unlock_irqrestore(&recv_queue->lock, flags);
2362                         dma_unmap_single(qp_info->port_priv->device->dma_device,
2363                                          pci_unmap_addr(&mad_priv->header,
2364                                                         mapping),
2365                                          sizeof *mad_priv -
2366                                            sizeof mad_priv->header,
2367                                          DMA_FROM_DEVICE);
2368                         kmem_cache_free(ib_mad_cache, mad_priv);
2369                         printk(KERN_ERR PFX "ib_post_recv failed: %d\n", ret);
2370                         break;
2371                 }
2372         } while (post);
2373
2374         return ret;
2375 }
2376
2377 /*
2378  * Return all the posted receive MADs
2379  */
2380 static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info)
2381 {
2382         struct ib_mad_private_header *mad_priv_hdr;
2383         struct ib_mad_private *recv;
2384         struct ib_mad_list_head *mad_list;
2385
2386         while (!list_empty(&qp_info->recv_queue.list)) {
2387
2388                 mad_list = list_entry(qp_info->recv_queue.list.next,
2389                                       struct ib_mad_list_head, list);
2390                 mad_priv_hdr = container_of(mad_list,
2391                                             struct ib_mad_private_header,
2392                                             mad_list);
2393                 recv = container_of(mad_priv_hdr, struct ib_mad_private,
2394                                     header);
2395
2396                 /* Remove from posted receive MAD list */
2397                 list_del(&mad_list->list);
2398
2399                 dma_unmap_single(qp_info->port_priv->device->dma_device,
2400                                  pci_unmap_addr(&recv->header, mapping),
2401                                  sizeof(struct ib_mad_private) -
2402                                  sizeof(struct ib_mad_private_header),
2403                                  DMA_FROM_DEVICE);
2404                 kmem_cache_free(ib_mad_cache, recv);
2405         }
2406
2407         qp_info->recv_queue.count = 0;
2408 }
2409
2410 /*
2411  * Start the port
2412  */
2413 static int ib_mad_port_start(struct ib_mad_port_private *port_priv)
2414 {
2415         int ret, i;
2416         struct ib_qp_attr *attr;
2417         struct ib_qp *qp;
2418
2419         attr = kmalloc(sizeof *attr, GFP_KERNEL);
2420         if (!attr) {
2421                 printk(KERN_ERR PFX "Couldn't kmalloc ib_qp_attr\n");
2422                 return -ENOMEM;
2423         }
2424
2425         for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2426                 qp = port_priv->qp_info[i].qp;
2427                 /*
2428                  * PKey index for QP1 is irrelevant but
2429                  * one is needed for the Reset to Init transition
2430                  */
2431                 attr->qp_state = IB_QPS_INIT;
2432                 attr->pkey_index = 0;
2433                 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY;
2434                 ret = ib_modify_qp(qp, attr, IB_QP_STATE |
2435                                              IB_QP_PKEY_INDEX | IB_QP_QKEY);
2436                 if (ret) {
2437                         printk(KERN_ERR PFX "Couldn't change QP%d state to "
2438                                "INIT: %d\n", i, ret);
2439                         goto out;
2440                 }
2441
2442                 attr->qp_state = IB_QPS_RTR;
2443                 ret = ib_modify_qp(qp, attr, IB_QP_STATE);
2444                 if (ret) {
2445                         printk(KERN_ERR PFX "Couldn't change QP%d state to "
2446                                "RTR: %d\n", i, ret);
2447                         goto out;
2448                 }
2449
2450                 attr->qp_state = IB_QPS_RTS;
2451                 attr->sq_psn = IB_MAD_SEND_Q_PSN;
2452                 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN);
2453                 if (ret) {
2454                         printk(KERN_ERR PFX "Couldn't change QP%d state to "
2455                                "RTS: %d\n", i, ret);
2456                         goto out;
2457                 }
2458         }
2459
2460         ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2461         if (ret) {
2462                 printk(KERN_ERR PFX "Failed to request completion "
2463                        "notification: %d\n", ret);
2464                 goto out;
2465         }
2466
2467         for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2468                 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
2469                 if (ret) {
2470                         printk(KERN_ERR PFX "Couldn't post receive WRs\n");
2471                         goto out;
2472                 }
2473         }
2474 out:
2475         kfree(attr);
2476         return ret;
2477 }
2478
2479 static void qp_event_handler(struct ib_event *event, void *qp_context)
2480 {
2481         struct ib_mad_qp_info   *qp_info = qp_context;
2482
2483         /* It's worse than that! He's dead, Jim! */
2484         printk(KERN_ERR PFX "Fatal error (%d) on MAD QP (%d)\n",
2485                 event->event, qp_info->qp->qp_num);
2486 }
2487
2488 static void init_mad_queue(struct ib_mad_qp_info *qp_info,
2489                            struct ib_mad_queue *mad_queue)
2490 {
2491         mad_queue->qp_info = qp_info;
2492         mad_queue->count = 0;
2493         spin_lock_init(&mad_queue->lock);
2494         INIT_LIST_HEAD(&mad_queue->list);
2495 }
2496
2497 static void init_mad_qp(struct ib_mad_port_private *port_priv,
2498                         struct ib_mad_qp_info *qp_info)
2499 {
2500         qp_info->port_priv = port_priv;
2501         init_mad_queue(qp_info, &qp_info->send_queue);
2502         init_mad_queue(qp_info, &qp_info->recv_queue);
2503         INIT_LIST_HEAD(&qp_info->overflow_list);
2504         spin_lock_init(&qp_info->snoop_lock);
2505         qp_info->snoop_table = NULL;
2506         qp_info->snoop_table_size = 0;
2507         atomic_set(&qp_info->snoop_count, 0);
2508 }
2509
2510 static int create_mad_qp(struct ib_mad_qp_info *qp_info,
2511                          enum ib_qp_type qp_type)
2512 {
2513         struct ib_qp_init_attr  qp_init_attr;
2514         int ret;
2515
2516         memset(&qp_init_attr, 0, sizeof qp_init_attr);
2517         qp_init_attr.send_cq = qp_info->port_priv->cq;
2518         qp_init_attr.recv_cq = qp_info->port_priv->cq;
2519         qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
2520         qp_init_attr.cap.max_send_wr = IB_MAD_QP_SEND_SIZE;
2521         qp_init_attr.cap.max_recv_wr = IB_MAD_QP_RECV_SIZE;
2522         qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG;
2523         qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG;
2524         qp_init_attr.qp_type = qp_type;
2525         qp_init_attr.port_num = qp_info->port_priv->port_num;
2526         qp_init_attr.qp_context = qp_info;
2527         qp_init_attr.event_handler = qp_event_handler;
2528         qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr);
2529         if (IS_ERR(qp_info->qp)) {
2530                 printk(KERN_ERR PFX "Couldn't create ib_mad QP%d\n",
2531                        get_spl_qp_index(qp_type));
2532                 ret = PTR_ERR(qp_info->qp);
2533                 goto error;
2534         }
2535         /* Use minimum queue sizes unless the CQ is resized */
2536         qp_info->send_queue.max_active = IB_MAD_QP_SEND_SIZE;
2537         qp_info->recv_queue.max_active = IB_MAD_QP_RECV_SIZE;
2538         return 0;
2539
2540 error:
2541         return ret;
2542 }
2543
2544 static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
2545 {
2546         ib_destroy_qp(qp_info->qp);
2547         if (qp_info->snoop_table)
2548                 kfree(qp_info->snoop_table);
2549 }
2550
2551 /*
2552  * Open the port
2553  * Create the QP, PD, MR, and CQ if needed
2554  */
2555 static int ib_mad_port_open(struct ib_device *device,
2556                             int port_num)
2557 {
2558         int ret, cq_size;
2559         struct ib_mad_port_private *port_priv;
2560         unsigned long flags;
2561         char name[sizeof "ib_mad123"];
2562
2563         /* Create new device info */
2564         port_priv = kmalloc(sizeof *port_priv, GFP_KERNEL);
2565         if (!port_priv) {
2566                 printk(KERN_ERR PFX "No memory for ib_mad_port_private\n");
2567                 return -ENOMEM;
2568         }
2569         memset(port_priv, 0, sizeof *port_priv);
2570         port_priv->device = device;
2571         port_priv->port_num = port_num;
2572         spin_lock_init(&port_priv->reg_lock);
2573         INIT_LIST_HEAD(&port_priv->agent_list);
2574         init_mad_qp(port_priv, &port_priv->qp_info[0]);
2575         init_mad_qp(port_priv, &port_priv->qp_info[1]);
2576
2577         cq_size = (IB_MAD_QP_SEND_SIZE + IB_MAD_QP_RECV_SIZE) * 2;
2578         port_priv->cq = ib_create_cq(port_priv->device,
2579                                      ib_mad_thread_completion_handler,
2580                                      NULL, port_priv, cq_size);
2581         if (IS_ERR(port_priv->cq)) {
2582                 printk(KERN_ERR PFX "Couldn't create ib_mad CQ\n");
2583                 ret = PTR_ERR(port_priv->cq);
2584                 goto error3;
2585         }
2586
2587         port_priv->pd = ib_alloc_pd(device);
2588         if (IS_ERR(port_priv->pd)) {
2589                 printk(KERN_ERR PFX "Couldn't create ib_mad PD\n");
2590                 ret = PTR_ERR(port_priv->pd);
2591                 goto error4;
2592         }
2593
2594         port_priv->mr = ib_get_dma_mr(port_priv->pd, IB_ACCESS_LOCAL_WRITE);
2595         if (IS_ERR(port_priv->mr)) {
2596                 printk(KERN_ERR PFX "Couldn't get ib_mad DMA MR\n");
2597                 ret = PTR_ERR(port_priv->mr);
2598                 goto error5;
2599         }
2600
2601         ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
2602         if (ret)
2603                 goto error6;
2604         ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI);
2605         if (ret)
2606                 goto error7;
2607
2608         snprintf(name, sizeof name, "ib_mad%d", port_num);
2609         port_priv->wq = create_singlethread_workqueue(name);
2610         if (!port_priv->wq) {
2611                 ret = -ENOMEM;
2612                 goto error8;
2613         }
2614         INIT_WORK(&port_priv->work, ib_mad_completion_handler, port_priv);
2615
2616         ret = ib_mad_port_start(port_priv);
2617         if (ret) {
2618                 printk(KERN_ERR PFX "Couldn't start port\n");
2619                 goto error9;
2620         }
2621
2622         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2623         list_add_tail(&port_priv->port_list, &ib_mad_port_list);
2624         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2625         return 0;
2626
2627 error9:
2628         destroy_workqueue(port_priv->wq);
2629 error8:
2630         destroy_mad_qp(&port_priv->qp_info[1]);
2631 error7:
2632         destroy_mad_qp(&port_priv->qp_info[0]);
2633 error6:
2634         ib_dereg_mr(port_priv->mr);
2635 error5:
2636         ib_dealloc_pd(port_priv->pd);
2637 error4:
2638         ib_destroy_cq(port_priv->cq);
2639         cleanup_recv_queue(&port_priv->qp_info[1]);
2640         cleanup_recv_queue(&port_priv->qp_info[0]);
2641 error3:
2642         kfree(port_priv);
2643
2644         return ret;
2645 }
2646
2647 /*
2648  * Close the port
2649  * If there are no classes using the port, free the port
2650  * resources (CQ, MR, PD, QP) and remove the port's info structure
2651  */
2652 static int ib_mad_port_close(struct ib_device *device, int port_num)
2653 {
2654         struct ib_mad_port_private *port_priv;
2655         unsigned long flags;
2656
2657         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2658         port_priv = __ib_get_mad_port(device, port_num);
2659         if (port_priv == NULL) {
2660                 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2661                 printk(KERN_ERR PFX "Port %d not found\n", port_num);
2662                 return -ENODEV;
2663         }
2664         list_del(&port_priv->port_list);
2665         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2666
2667         /* Stop processing completions. */
2668         flush_workqueue(port_priv->wq);
2669         destroy_workqueue(port_priv->wq);
2670         destroy_mad_qp(&port_priv->qp_info[1]);
2671         destroy_mad_qp(&port_priv->qp_info[0]);
2672         ib_dereg_mr(port_priv->mr);
2673         ib_dealloc_pd(port_priv->pd);
2674         ib_destroy_cq(port_priv->cq);
2675         cleanup_recv_queue(&port_priv->qp_info[1]);
2676         cleanup_recv_queue(&port_priv->qp_info[0]);
2677         /* XXX: Handle deallocation of MAD registration tables */
2678
2679         kfree(port_priv);
2680
2681         return 0;
2682 }
2683
2684 static void ib_mad_init_device(struct ib_device *device)
2685 {
2686         int num_ports, cur_port, i;
2687
2688         if (device->node_type == IB_NODE_SWITCH) {
2689                 num_ports = 1;
2690                 cur_port = 0;
2691         } else {
2692                 num_ports = device->phys_port_cnt;
2693                 cur_port = 1;
2694         }
2695         for (i = 0; i < num_ports; i++, cur_port++) {
2696                 if (ib_mad_port_open(device, cur_port)) {
2697                         printk(KERN_ERR PFX "Couldn't open %s port %d\n",
2698                                device->name, cur_port);
2699                         goto error_device_open;
2700                 }
2701                 if (ib_agent_port_open(device, cur_port)) {
2702                         printk(KERN_ERR PFX "Couldn't open %s port %d "
2703                                "for agents\n",
2704                                device->name, cur_port);
2705                         goto error_device_open;
2706                 }
2707         }
2708         return;
2709
2710 error_device_open:
2711         while (i > 0) {
2712                 cur_port--;
2713                 if (ib_agent_port_close(device, cur_port))
2714                         printk(KERN_ERR PFX "Couldn't close %s port %d "
2715                                "for agents\n",
2716                                device->name, cur_port);
2717                 if (ib_mad_port_close(device, cur_port))
2718                         printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2719                                device->name, cur_port);
2720                 i--;
2721         }
2722 }
2723
2724 static void ib_mad_remove_device(struct ib_device *device)
2725 {
2726         int i, num_ports, cur_port;
2727
2728         if (device->node_type == IB_NODE_SWITCH) {
2729                 num_ports = 1;
2730                 cur_port = 0;
2731         } else {
2732                 num_ports = device->phys_port_cnt;
2733                 cur_port = 1;
2734         }
2735         for (i = 0; i < num_ports; i++, cur_port++) {
2736                 if (ib_agent_port_close(device, cur_port))
2737                         printk(KERN_ERR PFX "Couldn't close %s port %d "
2738                                "for agents\n",
2739                                device->name, cur_port);
2740                 if (ib_mad_port_close(device, cur_port))
2741                         printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2742                                device->name, cur_port);
2743         }
2744 }
2745
2746 static struct ib_client mad_client = {
2747         .name   = "mad",
2748         .add = ib_mad_init_device,
2749         .remove = ib_mad_remove_device
2750 };
2751
2752 static int __init ib_mad_init_module(void)
2753 {
2754         int ret;
2755
2756         spin_lock_init(&ib_mad_port_list_lock);
2757         spin_lock_init(&ib_agent_port_list_lock);
2758
2759         ib_mad_cache = kmem_cache_create("ib_mad",
2760                                          sizeof(struct ib_mad_private),
2761                                          0,
2762                                          SLAB_HWCACHE_ALIGN,
2763                                          NULL,
2764                                          NULL);
2765         if (!ib_mad_cache) {
2766                 printk(KERN_ERR PFX "Couldn't create ib_mad cache\n");
2767                 ret = -ENOMEM;
2768                 goto error1;
2769         }
2770
2771         INIT_LIST_HEAD(&ib_mad_port_list);
2772
2773         if (ib_register_client(&mad_client)) {
2774                 printk(KERN_ERR PFX "Couldn't register ib_mad client\n");
2775                 ret = -EINVAL;
2776                 goto error2;
2777         }
2778
2779         return 0;
2780
2781 error2:
2782         kmem_cache_destroy(ib_mad_cache);
2783 error1:
2784         return ret;
2785 }
2786
2787 static void __exit ib_mad_cleanup_module(void)
2788 {
2789         ib_unregister_client(&mad_client);
2790
2791         if (kmem_cache_destroy(ib_mad_cache)) {
2792                 printk(KERN_DEBUG PFX "Failed to destroy ib_mad cache\n");
2793         }
2794 }
2795
2796 module_init(ib_mad_init_module);
2797 module_exit(ib_mad_cleanup_module);
2798