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

   1 /*
   2  * Copyright (c) 2004, 2005 Voltaire, Inc. All rights reserved.
   3  * Copyright (c) 2005 Intel Corporation.  All rights reserved.
   4  * Copyright (c) 2005 Mellanox Technologies Ltd.  All rights reserved.
   5  *
   6  * This software is available to you under a choice of one of two
   7  * licenses.  You may choose to be licensed under the terms of the GNU
   8  * General Public License (GPL) Version 2, available from the file
   9  * COPYING in the main directory of this source tree, or the
  10  * OpenIB.org BSD license below:
  11  *
  12  *     Redistribution and use in source and binary forms, with or
  13  *     without modification, are permitted provided that the following
  14  *     conditions are met:
  15  *
  16  *      - Redistributions of source code must retain the above
  17  *        copyright notice, this list of conditions and the following
  18  *        disclaimer.
  19  *
  20  *      - Redistributions in binary form must reproduce the above
  21  *        copyright notice, this list of conditions and the following
  22  *        disclaimer in the documentation and/or other materials
  23  *        provided with the distribution.
  24  *
  25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  32  * SOFTWARE.
  33  *
  34  * $Id: mad.c 5596 2006-03-03 01:00:07Z sean.hefty $
  35  */
  36 #include <linux/dma-mapping.h>
  37 #include <rdma/ib_cache.h>
  38
  39 #include "mad_priv.h"
  40 #include "mad_rmpp.h"
  41 #include "smi.h"
  42 #include "agent.h"
  43
  44 MODULE_LICENSE("Dual BSD/GPL");
  45 MODULE_DESCRIPTION("kernel IB MAD API");
  46 MODULE_AUTHOR("Hal Rosenstock");
  47 MODULE_AUTHOR("Sean Hefty");
  48
  49 static struct kmem_cache *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(struct work_struct *work);
  69 static void local_completions(struct work_struct *work);
  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 int ib_response_mad(struct ib_mad *mad)
 171 {
 172         return ((mad->mad_hdr.method & IB_MGMT_METHOD_RESP) ||
 173                 (mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS) ||
 174                 ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_BM) &&
 175                  (mad->mad_hdr.attr_mod & IB_BM_ATTR_MOD_RESP)));
 176 }
 177 EXPORT_SYMBOL(ib_response_mad);
 178
 179 /*
 180  * ib_register_mad_agent - Register to send/receive MADs
 181  */
 182 struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
 183                                            u8 port_num,
 184                                            enum ib_qp_type qp_type,
 185                                            struct ib_mad_reg_req *mad_reg_req,
 186                                            u8 rmpp_version,
 187                                            ib_mad_send_handler send_handler,
 188                                            ib_mad_recv_handler recv_handler,
 189                                            void *context)
 190 {
 191         struct ib_mad_port_private *port_priv;
 192         struct ib_mad_agent *ret = ERR_PTR(-EINVAL);
 193         struct ib_mad_agent_private *mad_agent_priv;
 194         struct ib_mad_reg_req *reg_req = NULL;
 195         struct ib_mad_mgmt_class_table *class;
 196         struct ib_mad_mgmt_vendor_class_table *vendor;
 197         struct ib_mad_mgmt_vendor_class *vendor_class;
 198         struct ib_mad_mgmt_method_table *method;
 199         int ret2, qpn;
 200         unsigned long flags;
 201         u8 mgmt_class, vclass;
 202
 203         /* Validate parameters */
 204         qpn = get_spl_qp_index(qp_type);
 205         if (qpn == -1)
 206                 goto error1;
 207
 208         if (rmpp_version && rmpp_version != IB_MGMT_RMPP_VERSION)
 209                 goto error1;
 210
 211         /* Validate MAD registration request if supplied */
 212         if (mad_reg_req) {
 213                 if (mad_reg_req->mgmt_class_version >= MAX_MGMT_VERSION)
 214                         goto error1;
 215                 if (!recv_handler)
 216                         goto error1;
 217                 if (mad_reg_req->mgmt_class >= MAX_MGMT_CLASS) {
 218                         /*
 219                          * IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE is the only
 220                          * one in this range currently allowed
 221                          */
 222                         if (mad_reg_req->mgmt_class !=
 223                             IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
 224                                 goto error1;
 225                 } else if (mad_reg_req->mgmt_class == 0) {
 226                         /*
 227                          * Class 0 is reserved in IBA and is used for
 228                          * aliasing of IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE
 229                          */
 230                         goto error1;
 231                 } else if (is_vendor_class(mad_reg_req->mgmt_class)) {
 232                         /*
 233                          * If class is in "new" vendor range,
 234                          * ensure supplied OUI is not zero
 235                          */
 236                         if (!is_vendor_oui(mad_reg_req->oui))
 237                                 goto error1;
 238                 }
 239                 /* Make sure class supplied is consistent with RMPP */
 240                 if (!ib_is_mad_class_rmpp(mad_reg_req->mgmt_class)) {
 241                         if (rmpp_version)
 242                                 goto error1;
 243                 }
 244                 /* Make sure class supplied is consistent with QP type */
 245                 if (qp_type == IB_QPT_SMI) {
 246                         if ((mad_reg_req->mgmt_class !=
 247                                         IB_MGMT_CLASS_SUBN_LID_ROUTED) &&
 248                             (mad_reg_req->mgmt_class !=
 249                                         IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
 250                                 goto error1;
 251                 } else {
 252                         if ((mad_reg_req->mgmt_class ==
 253                                         IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
 254                             (mad_reg_req->mgmt_class ==
 255                                         IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
 256                                 goto error1;
 257                 }
 258         } else {
 259                 /* No registration request supplied */
 260                 if (!send_handler)
 261                         goto error1;
 262         }
 263
 264         /* Validate device and port */
 265         port_priv = ib_get_mad_port(device, port_num);
 266         if (!port_priv) {
 267                 ret = ERR_PTR(-ENODEV);
 268                 goto error1;
 269         }
 270
 271         /* Allocate structures */
 272         mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL);
 273         if (!mad_agent_priv) {
 274                 ret = ERR_PTR(-ENOMEM);
 275                 goto error1;
 276         }
 277
 278         mad_agent_priv->agent.mr = ib_get_dma_mr(port_priv->qp_info[qpn].qp->pd,
 279                                                  IB_ACCESS_LOCAL_WRITE);
 280         if (IS_ERR(mad_agent_priv->agent.mr)) {
 281                 ret = ERR_PTR(-ENOMEM);
 282                 goto error2;
 283         }
 284
 285         if (mad_reg_req) {
 286                 reg_req = kmalloc(sizeof *reg_req, GFP_KERNEL);
 287                 if (!reg_req) {
 288                         ret = ERR_PTR(-ENOMEM);
 289                         goto error3;
 290                 }
 291                 /* Make a copy of the MAD registration request */
 292                 memcpy(reg_req, mad_reg_req, sizeof *reg_req);
 293         }
 294
 295         /* Now, fill in the various structures */
 296         mad_agent_priv->qp_info = &port_priv->qp_info[qpn];
 297         mad_agent_priv->reg_req = reg_req;
 298         mad_agent_priv->agent.rmpp_version = rmpp_version;
 299         mad_agent_priv->agent.device = device;
 300         mad_agent_priv->agent.recv_handler = recv_handler;
 301         mad_agent_priv->agent.send_handler = send_handler;
 302         mad_agent_priv->agent.context = context;
 303         mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp;
 304         mad_agent_priv->agent.port_num = port_num;
 305
 306         spin_lock_irqsave(&port_priv->reg_lock, flags);
 307         mad_agent_priv->agent.hi_tid = ++ib_mad_client_id;
 308
 309         /*
 310          * Make sure MAD registration (if supplied)
 311          * is non overlapping with any existing ones
 312          */
 313         if (mad_reg_req) {
 314                 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class);
 315                 if (!is_vendor_class(mgmt_class)) {
 316                         class = port_priv->version[mad_reg_req->
 317                                                    mgmt_class_version].class;
 318                         if (class) {
 319                                 method = class->method_table[mgmt_class];
 320                                 if (method) {
 321                                         if (method_in_use(&method,
 322                                                            mad_reg_req))
 323                                                 goto error4;
 324                                 }
 325                         }
 326                         ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv,
 327                                                   mgmt_class);
 328                 } else {
 329                         /* "New" vendor class range */
 330                         vendor = port_priv->version[mad_reg_req->
 331                                                     mgmt_class_version].vendor;
 332                         if (vendor) {
 333                                 vclass = vendor_class_index(mgmt_class);
 334                                 vendor_class = vendor->vendor_class[vclass];
 335                                 if (vendor_class) {
 336                                         if (is_vendor_method_in_use(
 337                                                         vendor_class,
 338                                                         mad_reg_req))
 339                                                 goto error4;
 340                                 }
 341                         }
 342                         ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv);
 343                 }
 344                 if (ret2) {
 345                         ret = ERR_PTR(ret2);
 346                         goto error4;
 347                 }
 348         }
 349
 350         /* Add mad agent into port's agent list */
 351         list_add_tail(&mad_agent_priv->agent_list, &port_priv->agent_list);
 352         spin_unlock_irqrestore(&port_priv->reg_lock, flags);
 353
 354         spin_lock_init(&mad_agent_priv->lock);
 355         INIT_LIST_HEAD(&mad_agent_priv->send_list);
 356         INIT_LIST_HEAD(&mad_agent_priv->wait_list);
 357         INIT_LIST_HEAD(&mad_agent_priv->done_list);
 358         INIT_LIST_HEAD(&mad_agent_priv->rmpp_list);
 359         INIT_DELAYED_WORK(&mad_agent_priv->timed_work, timeout_sends);
 360         INIT_LIST_HEAD(&mad_agent_priv->local_list);
 361         INIT_WORK(&mad_agent_priv->local_work, local_completions);
 362         atomic_set(&mad_agent_priv->refcount, 1);
 363         init_completion(&mad_agent_priv->comp);
 364
 365         return &mad_agent_priv->agent;
 366
 367 error4:
 368         spin_unlock_irqrestore(&port_priv->reg_lock, flags);
 369         kfree(reg_req);
 370 error3:
 371         ib_dereg_mr(mad_agent_priv->agent.mr);
 372 error2:
 373         kfree(mad_agent_priv);
 374 error1:
 375         return ret;
 376 }
 377 EXPORT_SYMBOL(ib_register_mad_agent);
 378
 379 static inline int is_snooping_sends(int mad_snoop_flags)
 380 {
 381         return (mad_snoop_flags &
 382                 (/*IB_MAD_SNOOP_POSTED_SENDS |
 383                  IB_MAD_SNOOP_RMPP_SENDS |*/
 384                  IB_MAD_SNOOP_SEND_COMPLETIONS /*|
 385                  IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS*/));
 386 }
 387
 388 static inline int is_snooping_recvs(int mad_snoop_flags)
 389 {
 390         return (mad_snoop_flags &
 391                 (IB_MAD_SNOOP_RECVS /*|
 392                  IB_MAD_SNOOP_RMPP_RECVS*/));
 393 }
 394
 395 static int register_snoop_agent(struct ib_mad_qp_info *qp_info,
 396                                 struct ib_mad_snoop_private *mad_snoop_priv)
 397 {
 398         struct ib_mad_snoop_private **new_snoop_table;
 399         unsigned long flags;
 400         int i;
 401
 402         spin_lock_irqsave(&qp_info->snoop_lock, flags);
 403         /* Check for empty slot in array. */
 404         for (i = 0; i < qp_info->snoop_table_size; i++)
 405                 if (!qp_info->snoop_table[i])
 406                         break;
 407
 408         if (i == qp_info->snoop_table_size) {
 409                 /* Grow table. */
 410                 new_snoop_table = kmalloc(sizeof mad_snoop_priv *
 411                                           qp_info->snoop_table_size + 1,
 412                                           GFP_ATOMIC);
 413                 if (!new_snoop_table) {
 414                         i = -ENOMEM;
 415                         goto out;
 416                 }
 417                 if (qp_info->snoop_table) {
 418                         memcpy(new_snoop_table, qp_info->snoop_table,
 419                                sizeof mad_snoop_priv *
 420                                qp_info->snoop_table_size);
 421                         kfree(qp_info->snoop_table);
 422                 }
 423                 qp_info->snoop_table = new_snoop_table;
 424                 qp_info->snoop_table_size++;
 425         }
 426         qp_info->snoop_table[i] = mad_snoop_priv;
 427         atomic_inc(&qp_info->snoop_count);
 428 out:
 429         spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 430         return i;
 431 }
 432
 433 struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device,
 434                                            u8 port_num,
 435                                            enum ib_qp_type qp_type,
 436                                            int mad_snoop_flags,
 437                                            ib_mad_snoop_handler snoop_handler,
 438                                            ib_mad_recv_handler recv_handler,
 439                                            void *context)
 440 {
 441         struct ib_mad_port_private *port_priv;
 442         struct ib_mad_agent *ret;
 443         struct ib_mad_snoop_private *mad_snoop_priv;
 444         int qpn;
 445
 446         /* Validate parameters */
 447         if ((is_snooping_sends(mad_snoop_flags) && !snoop_handler) ||
 448             (is_snooping_recvs(mad_snoop_flags) && !recv_handler)) {
 449                 ret = ERR_PTR(-EINVAL);
 450                 goto error1;
 451         }
 452         qpn = get_spl_qp_index(qp_type);
 453         if (qpn == -1) {
 454                 ret = ERR_PTR(-EINVAL);
 455                 goto error1;
 456         }
 457         port_priv = ib_get_mad_port(device, port_num);
 458         if (!port_priv) {
 459                 ret = ERR_PTR(-ENODEV);
 460                 goto error1;
 461         }
 462         /* Allocate structures */
 463         mad_snoop_priv = kzalloc(sizeof *mad_snoop_priv, GFP_KERNEL);
 464         if (!mad_snoop_priv) {
 465                 ret = ERR_PTR(-ENOMEM);
 466                 goto error1;
 467         }
 468
 469         /* Now, fill in the various structures */
 470         mad_snoop_priv->qp_info = &port_priv->qp_info[qpn];
 471         mad_snoop_priv->agent.device = device;
 472         mad_snoop_priv->agent.recv_handler = recv_handler;
 473         mad_snoop_priv->agent.snoop_handler = snoop_handler;
 474         mad_snoop_priv->agent.context = context;
 475         mad_snoop_priv->agent.qp = port_priv->qp_info[qpn].qp;
 476         mad_snoop_priv->agent.port_num = port_num;
 477         mad_snoop_priv->mad_snoop_flags = mad_snoop_flags;
 478         init_completion(&mad_snoop_priv->comp);
 479         mad_snoop_priv->snoop_index = register_snoop_agent(
 480                                                 &port_priv->qp_info[qpn],
 481                                                 mad_snoop_priv);
 482         if (mad_snoop_priv->snoop_index < 0) {
 483                 ret = ERR_PTR(mad_snoop_priv->snoop_index);
 484                 goto error2;
 485         }
 486
 487         atomic_set(&mad_snoop_priv->refcount, 1);
 488         return &mad_snoop_priv->agent;
 489
 490 error2:
 491         kfree(mad_snoop_priv);
 492 error1:
 493         return ret;
 494 }
 495 EXPORT_SYMBOL(ib_register_mad_snoop);
 496
 497 static inline void deref_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
 498 {
 499         if (atomic_dec_and_test(&mad_agent_priv->refcount))
 500                 complete(&mad_agent_priv->comp);
 501 }
 502
 503 static inline void deref_snoop_agent(struct ib_mad_snoop_private *mad_snoop_priv)
 504 {
 505         if (atomic_dec_and_test(&mad_snoop_priv->refcount))
 506                 complete(&mad_snoop_priv->comp);
 507 }
 508
 509 static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
 510 {
 511         struct ib_mad_port_private *port_priv;
 512         unsigned long flags;
 513
 514         /* Note that we could still be handling received MADs */
 515
 516         /*
 517          * Canceling all sends results in dropping received response
 518          * MADs, preventing us from queuing additional work
 519          */
 520         cancel_mads(mad_agent_priv);
 521         port_priv = mad_agent_priv->qp_info->port_priv;
 522         cancel_delayed_work(&mad_agent_priv->timed_work);
 523
 524         spin_lock_irqsave(&port_priv->reg_lock, flags);
 525         remove_mad_reg_req(mad_agent_priv);
 526         list_del(&mad_agent_priv->agent_list);
 527         spin_unlock_irqrestore(&port_priv->reg_lock, flags);
 528
 529         flush_workqueue(port_priv->wq);
 530         ib_cancel_rmpp_recvs(mad_agent_priv);
 531
 532         deref_mad_agent(mad_agent_priv);
 533         wait_for_completion(&mad_agent_priv->comp);
 534
 535         kfree(mad_agent_priv->reg_req);
 536         ib_dereg_mr(mad_agent_priv->agent.mr);
 537         kfree(mad_agent_priv);
 538 }
 539
 540 static void unregister_mad_snoop(struct ib_mad_snoop_private *mad_snoop_priv)
 541 {
 542         struct ib_mad_qp_info *qp_info;
 543         unsigned long flags;
 544
 545         qp_info = mad_snoop_priv->qp_info;
 546         spin_lock_irqsave(&qp_info->snoop_lock, flags);
 547         qp_info->snoop_table[mad_snoop_priv->snoop_index] = NULL;
 548         atomic_dec(&qp_info->snoop_count);
 549         spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 550
 551         deref_snoop_agent(mad_snoop_priv);
 552         wait_for_completion(&mad_snoop_priv->comp);
 553
 554         kfree(mad_snoop_priv);
 555 }
 556
 557 /*
 558  * ib_unregister_mad_agent - Unregisters a client from using MAD services
 559  */
 560 int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent)
 561 {
 562         struct ib_mad_agent_private *mad_agent_priv;
 563         struct ib_mad_snoop_private *mad_snoop_priv;
 564
 565         /* If the TID is zero, the agent can only snoop. */
 566         if (mad_agent->hi_tid) {
 567                 mad_agent_priv = container_of(mad_agent,
 568                                               struct ib_mad_agent_private,
 569                                               agent);
 570                 unregister_mad_agent(mad_agent_priv);
 571         } else {
 572                 mad_snoop_priv = container_of(mad_agent,
 573                                               struct ib_mad_snoop_private,
 574                                               agent);
 575                 unregister_mad_snoop(mad_snoop_priv);
 576         }
 577         return 0;
 578 }
 579 EXPORT_SYMBOL(ib_unregister_mad_agent);
 580
 581 static void dequeue_mad(struct ib_mad_list_head *mad_list)
 582 {
 583         struct ib_mad_queue *mad_queue;
 584         unsigned long flags;
 585
 586         BUG_ON(!mad_list->mad_queue);
 587         mad_queue = mad_list->mad_queue;
 588         spin_lock_irqsave(&mad_queue->lock, flags);
 589         list_del(&mad_list->list);
 590         mad_queue->count--;
 591         spin_unlock_irqrestore(&mad_queue->lock, flags);
 592 }
 593
 594 static void snoop_send(struct ib_mad_qp_info *qp_info,
 595                        struct ib_mad_send_buf *send_buf,
 596                        struct ib_mad_send_wc *mad_send_wc,
 597                        int mad_snoop_flags)
 598 {
 599         struct ib_mad_snoop_private *mad_snoop_priv;
 600         unsigned long flags;
 601         int i;
 602
 603         spin_lock_irqsave(&qp_info->snoop_lock, flags);
 604         for (i = 0; i < qp_info->snoop_table_size; i++) {
 605                 mad_snoop_priv = qp_info->snoop_table[i];
 606                 if (!mad_snoop_priv ||
 607                     !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
 608                         continue;
 609
 610                 atomic_inc(&mad_snoop_priv->refcount);
 611                 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 612                 mad_snoop_priv->agent.snoop_handler(&mad_snoop_priv->agent,
 613                                                     send_buf, mad_send_wc);
 614                 deref_snoop_agent(mad_snoop_priv);
 615                 spin_lock_irqsave(&qp_info->snoop_lock, flags);
 616         }
 617         spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 618 }
 619
 620 static void snoop_recv(struct ib_mad_qp_info *qp_info,
 621                        struct ib_mad_recv_wc *mad_recv_wc,
 622                        int mad_snoop_flags)
 623 {
 624         struct ib_mad_snoop_private *mad_snoop_priv;
 625         unsigned long flags;
 626         int i;
 627
 628         spin_lock_irqsave(&qp_info->snoop_lock, flags);
 629         for (i = 0; i < qp_info->snoop_table_size; i++) {
 630                 mad_snoop_priv = qp_info->snoop_table[i];
 631                 if (!mad_snoop_priv ||
 632                     !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
 633                         continue;
 634
 635                 atomic_inc(&mad_snoop_priv->refcount);
 636                 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 637                 mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent,
 638                                                    mad_recv_wc);
 639                 deref_snoop_agent(mad_snoop_priv);
 640                 spin_lock_irqsave(&qp_info->snoop_lock, flags);
 641         }
 642         spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 643 }
 644
 645 static void build_smp_wc(struct ib_qp *qp,
 646                          u64 wr_id, u16 slid, u16 pkey_index, u8 port_num,
 647                          struct ib_wc *wc)
 648 {
 649         memset(wc, 0, sizeof *wc);
 650         wc->wr_id = wr_id;
 651         wc->status = IB_WC_SUCCESS;
 652         wc->opcode = IB_WC_RECV;
 653         wc->pkey_index = pkey_index;
 654         wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh);
 655         wc->src_qp = IB_QP0;
 656         wc->qp = qp;
 657         wc->slid = slid;
 658         wc->sl = 0;
 659         wc->dlid_path_bits = 0;
 660         wc->port_num = port_num;
 661 }
 662
 663 /*
 664  * Return 0 if SMP is to be sent
 665  * Return 1 if SMP was consumed locally (whether or not solicited)
 666  * Return < 0 if error
 667  */
 668 static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv,
 669                                   struct ib_mad_send_wr_private *mad_send_wr)
 670 {
 671         int ret;
 672         struct ib_smp *smp = mad_send_wr->send_buf.mad;
 673         unsigned long flags;
 674         struct ib_mad_local_private *local;
 675         struct ib_mad_private *mad_priv;
 676         struct ib_mad_port_private *port_priv;
 677         struct ib_mad_agent_private *recv_mad_agent = NULL;
 678         struct ib_device *device = mad_agent_priv->agent.device;
 679         u8 port_num = mad_agent_priv->agent.port_num;
 680         struct ib_wc mad_wc;
 681         struct ib_send_wr *send_wr = &mad_send_wr->send_wr;
 682
 683         /*
 684          * Directed route handling starts if the initial LID routed part of
 685          * a request or the ending LID routed part of a response is empty.
 686          * If we are at the start of the LID routed part, don't update the
 687          * hop_ptr or hop_cnt.  See section 14.2.2, Vol 1 IB spec.
 688          */
 689         if ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) ==
 690              IB_LID_PERMISSIVE &&
 691             !smi_handle_dr_smp_send(smp, device->node_type, port_num)) {
 692                 ret = -EINVAL;
 693                 printk(KERN_ERR PFX "Invalid directed route\n");
 694                 goto out;
 695         }
 696         /* Check to post send on QP or process locally */
 697         ret = smi_check_local_smp(smp, device);
 698         if (!ret)
 699                 goto out;
 700
 701         local = kmalloc(sizeof *local, GFP_ATOMIC);
 702         if (!local) {
 703                 ret = -ENOMEM;
 704                 printk(KERN_ERR PFX "No memory for ib_mad_local_private\n");
 705                 goto out;
 706         }
 707         local->mad_priv = NULL;
 708         local->recv_mad_agent = NULL;
 709         mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_ATOMIC);
 710         if (!mad_priv) {
 711                 ret = -ENOMEM;
 712                 printk(KERN_ERR PFX "No memory for local response MAD\n");
 713                 kfree(local);
 714                 goto out;
 715         }
 716
 717         build_smp_wc(mad_agent_priv->agent.qp,
 718                      send_wr->wr_id, be16_to_cpu(smp->dr_slid),
 719                      send_wr->wr.ud.pkey_index,
 720                      send_wr->wr.ud.port_num, &mad_wc);
 721
 722         /* No GRH for DR SMP */
 723         ret = device->process_mad(device, 0, port_num, &mad_wc, NULL,
 724                                   (struct ib_mad *)smp,
 725                                   (struct ib_mad *)&mad_priv->mad);
 726         switch (ret)
 727         {
 728         case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
 729                 if (ib_response_mad(&mad_priv->mad.mad) &&
 730                     mad_agent_priv->agent.recv_handler) {
 731                         local->mad_priv = mad_priv;
 732                         local->recv_mad_agent = mad_agent_priv;
 733                         /*
 734                          * Reference MAD agent until receive
 735                          * side of local completion handled
 736                          */
 737                         atomic_inc(&mad_agent_priv->refcount);
 738                 } else
 739                         kmem_cache_free(ib_mad_cache, mad_priv);
 740                 break;
 741         case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
 742                 kmem_cache_free(ib_mad_cache, mad_priv);
 743                 break;
 744         case IB_MAD_RESULT_SUCCESS:
 745                 /* Treat like an incoming receive MAD */
 746                 port_priv = ib_get_mad_port(mad_agent_priv->agent.device,
 747                                             mad_agent_priv->agent.port_num);
 748                 if (port_priv) {
 749                         mad_priv->mad.mad.mad_hdr.tid =
 750                                 ((struct ib_mad *)smp)->mad_hdr.tid;
 751                         recv_mad_agent = find_mad_agent(port_priv,
 752                                                         &mad_priv->mad.mad);
 753                 }
 754                 if (!port_priv || !recv_mad_agent) {
 755                         kmem_cache_free(ib_mad_cache, mad_priv);
 756                         kfree(local);
 757                         ret = 0;
 758                         goto out;
 759                 }
 760                 local->mad_priv = mad_priv;
 761                 local->recv_mad_agent = recv_mad_agent;
 762                 break;
 763         default:
 764                 kmem_cache_free(ib_mad_cache, mad_priv);
 765                 kfree(local);
 766                 ret = -EINVAL;
 767                 goto out;
 768         }
 769
 770         local->mad_send_wr = mad_send_wr;
 771         /* Reference MAD agent until send side of local completion handled */
 772         atomic_inc(&mad_agent_priv->refcount);
 773         /* Queue local completion to local list */
 774         spin_lock_irqsave(&mad_agent_priv->lock, flags);
 775         list_add_tail(&local->completion_list, &mad_agent_priv->local_list);
 776         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
 777         queue_work(mad_agent_priv->qp_info->port_priv->wq,
 778                    &mad_agent_priv->local_work);
 779         ret = 1;
 780 out:
 781         return ret;
 782 }
 783
 784 static int get_pad_size(int hdr_len, int data_len)
 785 {
 786         int seg_size, pad;
 787
 788         seg_size = sizeof(struct ib_mad) - hdr_len;
 789         if (data_len && seg_size) {
 790                 pad = seg_size - data_len % seg_size;
 791                 return pad == seg_size ? 0 : pad;
 792         } else
 793                 return seg_size;
 794 }
 795
 796 static void free_send_rmpp_list(struct ib_mad_send_wr_private *mad_send_wr)
 797 {
 798         struct ib_rmpp_segment *s, *t;
 799
 800         list_for_each_entry_safe(s, t, &mad_send_wr->rmpp_list, list) {
 801                 list_del(&s->list);
 802                 kfree(s);
 803         }
 804 }
 805
 806 static int alloc_send_rmpp_list(struct ib_mad_send_wr_private *send_wr,
 807                                 gfp_t gfp_mask)
 808 {
 809         struct ib_mad_send_buf *send_buf = &send_wr->send_buf;
 810         struct ib_rmpp_mad *rmpp_mad = send_buf->mad;
 811         struct ib_rmpp_segment *seg = NULL;
 812         int left, seg_size, pad;
 813
 814         send_buf->seg_size = sizeof (struct ib_mad) - send_buf->hdr_len;
 815         seg_size = send_buf->seg_size;
 816         pad = send_wr->pad;
 817
 818         /* Allocate data segments. */
 819         for (left = send_buf->data_len + pad; left > 0; left -= seg_size) {
 820                 seg = kmalloc(sizeof (*seg) + seg_size, gfp_mask);
 821                 if (!seg) {
 822                         printk(KERN_ERR "alloc_send_rmpp_segs: RMPP mem "
 823                                "alloc failed for len %zd, gfp %#x\n",
 824                                sizeof (*seg) + seg_size, gfp_mask);
 825                         free_send_rmpp_list(send_wr);
 826                         return -ENOMEM;
 827                 }
 828                 seg->num = ++send_buf->seg_count;
 829                 list_add_tail(&seg->list, &send_wr->rmpp_list);
 830         }
 831
 832         /* Zero any padding */
 833         if (pad)
 834                 memset(seg->data + seg_size - pad, 0, pad);
 835
 836         rmpp_mad->rmpp_hdr.rmpp_version = send_wr->mad_agent_priv->
 837                                           agent.rmpp_version;
 838         rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA;
 839         ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
 840
 841         send_wr->cur_seg = container_of(send_wr->rmpp_list.next,
 842                                         struct ib_rmpp_segment, list);
 843         send_wr->last_ack_seg = send_wr->cur_seg;
 844         return 0;
 845 }
 846
 847 struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
 848                                             u32 remote_qpn, u16 pkey_index,
 849                                             int rmpp_active,
 850                                             int hdr_len, int data_len,
 851                                             gfp_t gfp_mask)
 852 {
 853         struct ib_mad_agent_private *mad_agent_priv;
 854         struct ib_mad_send_wr_private *mad_send_wr;
 855         int pad, message_size, ret, size;
 856         void *buf;
 857
 858         mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
 859                                       agent);
 860         pad = get_pad_size(hdr_len, data_len);
 861         message_size = hdr_len + data_len + pad;
 862
 863         if ((!mad_agent->rmpp_version &&
 864              (rmpp_active || message_size > sizeof(struct ib_mad))) ||
 865             (!rmpp_active && message_size > sizeof(struct ib_mad)))
 866                 return ERR_PTR(-EINVAL);
 867
 868         size = rmpp_active ? hdr_len : sizeof(struct ib_mad);
 869         buf = kzalloc(sizeof *mad_send_wr + size, gfp_mask);
 870         if (!buf)
 871                 return ERR_PTR(-ENOMEM);
 872
 873         mad_send_wr = buf + size;
 874         INIT_LIST_HEAD(&mad_send_wr->rmpp_list);
 875         mad_send_wr->send_buf.mad = buf;
 876         mad_send_wr->send_buf.hdr_len = hdr_len;
 877         mad_send_wr->send_buf.data_len = data_len;
 878         mad_send_wr->pad = pad;
 879
 880         mad_send_wr->mad_agent_priv = mad_agent_priv;
 881         mad_send_wr->sg_list[0].length = hdr_len;
 882         mad_send_wr->sg_list[0].lkey = mad_agent->mr->lkey;
 883         mad_send_wr->sg_list[1].length = sizeof(struct ib_mad) - hdr_len;
 884         mad_send_wr->sg_list[1].lkey = mad_agent->mr->lkey;
 885
 886         mad_send_wr->send_wr.wr_id = (unsigned long) mad_send_wr;
 887         mad_send_wr->send_wr.sg_list = mad_send_wr->sg_list;
 888         mad_send_wr->send_wr.num_sge = 2;
 889         mad_send_wr->send_wr.opcode = IB_WR_SEND;
 890         mad_send_wr->send_wr.send_flags = IB_SEND_SIGNALED;
 891         mad_send_wr->send_wr.wr.ud.remote_qpn = remote_qpn;
 892         mad_send_wr->send_wr.wr.ud.remote_qkey = IB_QP_SET_QKEY;
 893         mad_send_wr->send_wr.wr.ud.pkey_index = pkey_index;
 894
 895         if (rmpp_active) {
 896                 ret = alloc_send_rmpp_list(mad_send_wr, gfp_mask);
 897                 if (ret) {
 898                         kfree(buf);
 899                         return ERR_PTR(ret);
 900                 }
 901         }
 902
 903         mad_send_wr->send_buf.mad_agent = mad_agent;
 904         atomic_inc(&mad_agent_priv->refcount);
 905         return &mad_send_wr->send_buf;
 906 }
 907 EXPORT_SYMBOL(ib_create_send_mad);
 908
 909 int ib_get_mad_data_offset(u8 mgmt_class)
 910 {
 911         if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM)
 912                 return IB_MGMT_SA_HDR;
 913         else if ((mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
 914                  (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
 915                  (mgmt_class == IB_MGMT_CLASS_BIS))
 916                 return IB_MGMT_DEVICE_HDR;
 917         else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
 918                  (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))
 919                 return IB_MGMT_VENDOR_HDR;
 920         else
 921                 return IB_MGMT_MAD_HDR;
 922 }
 923 EXPORT_SYMBOL(ib_get_mad_data_offset);
 924
 925 int ib_is_mad_class_rmpp(u8 mgmt_class)
 926 {
 927         if ((mgmt_class == IB_MGMT_CLASS_SUBN_ADM) ||
 928             (mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
 929             (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
 930             (mgmt_class == IB_MGMT_CLASS_BIS) ||
 931             ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
 932              (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)))
 933                 return 1;
 934         return 0;
 935 }
 936 EXPORT_SYMBOL(ib_is_mad_class_rmpp);
 937
 938 void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num)
 939 {
 940         struct ib_mad_send_wr_private *mad_send_wr;
 941         struct list_head *list;
 942
 943         mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
 944                                    send_buf);
 945         list = &mad_send_wr->cur_seg->list;
 946
 947         if (mad_send_wr->cur_seg->num < seg_num) {
 948                 list_for_each_entry(mad_send_wr->cur_seg, list, list)
 949                         if (mad_send_wr->cur_seg->num == seg_num)
 950                                 break;
 951         } else if (mad_send_wr->cur_seg->num > seg_num) {
 952                 list_for_each_entry_reverse(mad_send_wr->cur_seg, list, list)
 953                         if (mad_send_wr->cur_seg->num == seg_num)
 954                                 break;
 955         }
 956         return mad_send_wr->cur_seg->data;
 957 }
 958 EXPORT_SYMBOL(ib_get_rmpp_segment);
 959
 960 static inline void *ib_get_payload(struct ib_mad_send_wr_private *mad_send_wr)
 961 {
 962         if (mad_send_wr->send_buf.seg_count)
 963                 return ib_get_rmpp_segment(&mad_send_wr->send_buf,
 964                                            mad_send_wr->seg_num);
 965         else
 966                 return mad_send_wr->send_buf.mad +
 967                        mad_send_wr->send_buf.hdr_len;
 968 }
 969
 970 void ib_free_send_mad(struct ib_mad_send_buf *send_buf)
 971 {
 972         struct ib_mad_agent_private *mad_agent_priv;
 973         struct ib_mad_send_wr_private *mad_send_wr;
 974
 975         mad_agent_priv = container_of(send_buf->mad_agent,
 976                                       struct ib_mad_agent_private, agent);
 977         mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
 978                                    send_buf);
 979
 980         free_send_rmpp_list(mad_send_wr);
 981         kfree(send_buf->mad);
 982         deref_mad_agent(mad_agent_priv);
 983 }
 984 EXPORT_SYMBOL(ib_free_send_mad);
 985
 986 int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr)
 987 {
 988         struct ib_mad_qp_info *qp_info;
 989         struct list_head *list;
 990         struct ib_send_wr *bad_send_wr;
 991         struct ib_mad_agent *mad_agent;
 992         struct ib_sge *sge;
 993         unsigned long flags;
 994         int ret;
 995
 996         /* Set WR ID to find mad_send_wr upon completion */
 997         qp_info = mad_send_wr->mad_agent_priv->qp_info;
 998         mad_send_wr->send_wr.wr_id = (unsigned long)&mad_send_wr->mad_list;
 999         mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;
1000
1001         mad_agent = mad_send_wr->send_buf.mad_agent;
1002         sge = mad_send_wr->sg_list;
1003         sge[0].addr = ib_dma_map_single(mad_agent->device,
1004                                         mad_send_wr->send_buf.mad,
1005                                         sge[0].length,
1006                                         DMA_TO_DEVICE);
1007         mad_send_wr->header_mapping = sge[0].addr;
1008
1009         sge[1].addr = ib_dma_map_single(mad_agent->device,
1010                                         ib_get_payload(mad_send_wr),
1011                                         sge[1].length,
1012                                         DMA_TO_DEVICE);
1013         mad_send_wr->payload_mapping = sge[1].addr;
1014
1015         spin_lock_irqsave(&qp_info->send_queue.lock, flags);
1016         if (qp_info->send_queue.count < qp_info->send_queue.max_active) {
1017                 ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr,
1018                                    &bad_send_wr);
1019                 list = &qp_info->send_queue.list;
1020         } else {
1021                 ret = 0;
1022                 list = &qp_info->overflow_list;
1023         }
1024
1025         if (!ret) {
1026                 qp_info->send_queue.count++;
1027                 list_add_tail(&mad_send_wr->mad_list.list, list);
1028         }
1029         spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
1030         if (ret) {
1031                 ib_dma_unmap_single(mad_agent->device,
1032                                     mad_send_wr->header_mapping,
1033                                     sge[0].length, DMA_TO_DEVICE);
1034                 ib_dma_unmap_single(mad_agent->device,
1035                                     mad_send_wr->payload_mapping,
1036                                     sge[1].length, DMA_TO_DEVICE);
1037         }
1038         return ret;
1039 }
1040
1041 /*
1042  * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
1043  *  with the registered client
1044  */
1045 int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
1046                      struct ib_mad_send_buf **bad_send_buf)
1047 {
1048         struct ib_mad_agent_private *mad_agent_priv;
1049         struct ib_mad_send_buf *next_send_buf;
1050         struct ib_mad_send_wr_private *mad_send_wr;
1051         unsigned long flags;
1052         int ret = -EINVAL;
1053
1054         /* Walk list of send WRs and post each on send list */
1055         for (; send_buf; send_buf = next_send_buf) {
1056
1057                 mad_send_wr = container_of(send_buf,
1058                                            struct ib_mad_send_wr_private,
1059                                            send_buf);
1060                 mad_agent_priv = mad_send_wr->mad_agent_priv;
1061
1062                 if (!send_buf->mad_agent->send_handler ||
1063                     (send_buf->timeout_ms &&
1064                      !send_buf->mad_agent->recv_handler)) {
1065                         ret = -EINVAL;
1066                         goto error;
1067                 }
1068
1069                 if (!ib_is_mad_class_rmpp(((struct ib_mad_hdr *) send_buf->mad)->mgmt_class)) {
1070                         if (mad_agent_priv->agent.rmpp_version) {
1071                                 ret = -EINVAL;
1072                                 goto error;
1073                         }
1074                 }
1075
1076                 /*
1077                  * Save pointer to next work request to post in case the
1078                  * current one completes, and the user modifies the work
1079                  * request associated with the completion
1080                  */
1081                 next_send_buf = send_buf->next;
1082                 mad_send_wr->send_wr.wr.ud.ah = send_buf->ah;
1083
1084                 if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class ==
1085                     IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1086                         ret = handle_outgoing_dr_smp(mad_agent_priv,
1087                                                      mad_send_wr);
1088                         if (ret < 0)            /* error */
1089                                 goto error;
1090                         else if (ret == 1)      /* locally consumed */
1091                                 continue;
1092                 }
1093
1094                 mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid;
1095                 /* Timeout will be updated after send completes */
1096                 mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms);
1097                 mad_send_wr->retries = send_buf->retries;
1098                 /* Reference for work request to QP + response */
1099                 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0);
1100                 mad_send_wr->status = IB_WC_SUCCESS;
1101
1102                 /* Reference MAD agent until send completes */
1103                 atomic_inc(&mad_agent_priv->refcount);
1104                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1105                 list_add_tail(&mad_send_wr->agent_list,
1106                               &mad_agent_priv->send_list);
1107                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1108
1109                 if (mad_agent_priv->agent.rmpp_version) {
1110                         ret = ib_send_rmpp_mad(mad_send_wr);
1111                         if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED)
1112                                 ret = ib_send_mad(mad_send_wr);
1113                 } else
1114                         ret = ib_send_mad(mad_send_wr);
1115                 if (ret < 0) {
1116                         /* Fail send request */
1117                         spin_lock_irqsave(&mad_agent_priv->lock, flags);
1118                         list_del(&mad_send_wr->agent_list);
1119                         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1120                         atomic_dec(&mad_agent_priv->refcount);
1121                         goto error;
1122                 }
1123         }
1124         return 0;
1125 error:
1126         if (bad_send_buf)
1127                 *bad_send_buf = send_buf;
1128         return ret;
1129 }
1130 EXPORT_SYMBOL(ib_post_send_mad);
1131
1132 /*
1133  * ib_free_recv_mad - Returns data buffers used to receive
1134  *  a MAD to the access layer
1135  */
1136 void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc)
1137 {
1138         struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf;
1139         struct ib_mad_private_header *mad_priv_hdr;
1140         struct ib_mad_private *priv;
1141         struct list_head free_list;
1142
1143         INIT_LIST_HEAD(&free_list);
1144         list_splice_init(&mad_recv_wc->rmpp_list, &free_list);
1145
1146         list_for_each_entry_safe(mad_recv_buf, temp_recv_buf,
1147                                         &free_list, list) {
1148                 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc,
1149                                            recv_buf);
1150                 mad_priv_hdr = container_of(mad_recv_wc,
1151                                             struct ib_mad_private_header,
1152                                             recv_wc);
1153                 priv = container_of(mad_priv_hdr, struct ib_mad_private,
1154                                     header);
1155                 kmem_cache_free(ib_mad_cache, priv);
1156         }
1157 }
1158 EXPORT_SYMBOL(ib_free_recv_mad);
1159
1160 struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
1161                                         u8 rmpp_version,
1162                                         ib_mad_send_handler send_handler,
1163                                         ib_mad_recv_handler recv_handler,
1164                                         void *context)
1165 {
1166         return ERR_PTR(-EINVAL);        /* XXX: for now */
1167 }
1168 EXPORT_SYMBOL(ib_redirect_mad_qp);
1169
1170 int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
1171                       struct ib_wc *wc)
1172 {
1173         printk(KERN_ERR PFX "ib_process_mad_wc() not implemented yet\n");
1174         return 0;
1175 }
1176 EXPORT_SYMBOL(ib_process_mad_wc);
1177
1178 static int method_in_use(struct ib_mad_mgmt_method_table **method,
1179                          struct ib_mad_reg_req *mad_reg_req)
1180 {
1181         int i;
1182
1183         for (i = find_first_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS);
1184              i < IB_MGMT_MAX_METHODS;
1185              i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1186                                1+i)) {
1187                 if ((*method)->agent[i]) {
1188                         printk(KERN_ERR PFX "Method %d already in use\n", i);
1189                         return -EINVAL;
1190                 }
1191         }
1192         return 0;
1193 }
1194
1195 static int allocate_method_table(struct ib_mad_mgmt_method_table **method)
1196 {
1197         /* Allocate management method table */
1198         *method = kzalloc(sizeof **method, GFP_ATOMIC);
1199         if (!*method) {
1200                 printk(KERN_ERR PFX "No memory for "
1201                        "ib_mad_mgmt_method_table\n");
1202                 return -ENOMEM;
1203         }
1204
1205         return 0;
1206 }
1207
1208 /*
1209  * Check to see if there are any methods still in use
1210  */
1211 static int check_method_table(struct ib_mad_mgmt_method_table *method)
1212 {
1213         int i;
1214
1215         for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
1216                 if (method->agent[i])
1217                         return 1;
1218         return 0;
1219 }
1220
1221 /*
1222  * Check to see if there are any method tables for this class still in use
1223  */
1224 static int check_class_table(struct ib_mad_mgmt_class_table *class)
1225 {
1226         int i;
1227
1228         for (i = 0; i < MAX_MGMT_CLASS; i++)
1229                 if (class->method_table[i])
1230                         return 1;
1231         return 0;
1232 }
1233
1234 static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class)
1235 {
1236         int i;
1237
1238         for (i = 0; i < MAX_MGMT_OUI; i++)
1239                 if (vendor_class->method_table[i])
1240                         return 1;
1241         return 0;
1242 }
1243
1244 static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class,
1245                            char *oui)
1246 {
1247         int i;
1248
1249         for (i = 0; i < MAX_MGMT_OUI; i++)
1250                 /* Is there matching OUI for this vendor class ? */
1251                 if (!memcmp(vendor_class->oui[i], oui, 3))
1252                         return i;
1253
1254         return -1;
1255 }
1256
1257 static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor)
1258 {
1259         int i;
1260
1261         for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++)
1262                 if (vendor->vendor_class[i])
1263                         return 1;
1264
1265         return 0;
1266 }
1267
1268 static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method,
1269                                      struct ib_mad_agent_private *agent)
1270 {
1271         int i;
1272
1273         /* Remove any methods for this mad agent */
1274         for (i = 0; i < IB_MGMT_MAX_METHODS; i++) {
1275                 if (method->agent[i] == agent) {
1276                         method->agent[i] = NULL;
1277                 }
1278         }
1279 }
1280
1281 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1282                               struct ib_mad_agent_private *agent_priv,
1283                               u8 mgmt_class)
1284 {
1285         struct ib_mad_port_private *port_priv;
1286         struct ib_mad_mgmt_class_table **class;
1287         struct ib_mad_mgmt_method_table **method;
1288         int i, ret;
1289
1290         port_priv = agent_priv->qp_info->port_priv;
1291         class = &port_priv->version[mad_reg_req->mgmt_class_version].class;
1292         if (!*class) {
1293                 /* Allocate management class table for "new" class version */
1294                 *class = kzalloc(sizeof **class, GFP_ATOMIC);
1295                 if (!*class) {
1296                         printk(KERN_ERR PFX "No memory for "
1297                                "ib_mad_mgmt_class_table\n");
1298                         ret = -ENOMEM;
1299                         goto error1;
1300                 }
1301
1302                 /* Allocate method table for this management class */
1303                 method = &(*class)->method_table[mgmt_class];
1304                 if ((ret = allocate_method_table(method)))
1305                         goto error2;
1306         } else {
1307                 method = &(*class)->method_table[mgmt_class];
1308                 if (!*method) {
1309                         /* Allocate method table for this management class */
1310                         if ((ret = allocate_method_table(method)))
1311                                 goto error1;
1312                 }
1313         }
1314
1315         /* Now, make sure methods are not already in use */
1316         if (method_in_use(method, mad_reg_req))
1317                 goto error3;
1318
1319         /* Finally, add in methods being registered */
1320         for (i = find_first_bit(mad_reg_req->method_mask,
1321                                 IB_MGMT_MAX_METHODS);
1322              i < IB_MGMT_MAX_METHODS;
1323              i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1324                                1+i)) {
1325                 (*method)->agent[i] = agent_priv;
1326         }
1327         return 0;
1328
1329 error3:
1330         /* Remove any methods for this mad agent */
1331         remove_methods_mad_agent(*method, agent_priv);
1332         /* Now, check to see if there are any methods in use */
1333         if (!check_method_table(*method)) {
1334                 /* If not, release management method table */
1335                 kfree(*method);
1336                 *method = NULL;
1337         }
1338         ret = -EINVAL;
1339         goto error1;
1340 error2:
1341         kfree(*class);
1342         *class = NULL;
1343 error1:
1344         return ret;
1345 }
1346
1347 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1348                            struct ib_mad_agent_private *agent_priv)
1349 {
1350         struct ib_mad_port_private *port_priv;
1351         struct ib_mad_mgmt_vendor_class_table **vendor_table;
1352         struct ib_mad_mgmt_vendor_class_table *vendor = NULL;
1353         struct ib_mad_mgmt_vendor_class *vendor_class = NULL;
1354         struct ib_mad_mgmt_method_table **method;
1355         int i, ret = -ENOMEM;
1356         u8 vclass;
1357
1358         /* "New" vendor (with OUI) class */
1359         vclass = vendor_class_index(mad_reg_req->mgmt_class);
1360         port_priv = agent_priv->qp_info->port_priv;
1361         vendor_table = &port_priv->version[
1362                                 mad_reg_req->mgmt_class_version].vendor;
1363         if (!*vendor_table) {
1364                 /* Allocate mgmt vendor class table for "new" class version */
1365                 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC);
1366                 if (!vendor) {
1367                         printk(KERN_ERR PFX "No memory for "
1368                                "ib_mad_mgmt_vendor_class_table\n");
1369                         goto error1;
1370                 }
1371
1372                 *vendor_table = vendor;
1373         }
1374         if (!(*vendor_table)->vendor_class[vclass]) {
1375                 /* Allocate table for this management vendor class */
1376                 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC);
1377                 if (!vendor_class) {
1378                         printk(KERN_ERR PFX "No memory for "
1379                                "ib_mad_mgmt_vendor_class\n");
1380                         goto error2;
1381                 }
1382
1383                 (*vendor_table)->vendor_class[vclass] = vendor_class;
1384         }
1385         for (i = 0; i < MAX_MGMT_OUI; i++) {
1386                 /* Is there matching OUI for this vendor class ? */
1387                 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i],
1388                             mad_reg_req->oui, 3)) {
1389                         method = &(*vendor_table)->vendor_class[
1390                                                 vclass]->method_table[i];
1391                         BUG_ON(!*method);
1392                         goto check_in_use;
1393                 }
1394         }
1395         for (i = 0; i < MAX_MGMT_OUI; i++) {
1396                 /* OUI slot available ? */
1397                 if (!is_vendor_oui((*vendor_table)->vendor_class[
1398                                 vclass]->oui[i])) {
1399                         method = &(*vendor_table)->vendor_class[
1400                                 vclass]->method_table[i];
1401                         BUG_ON(*method);
1402                         /* Allocate method table for this OUI */
1403                         if ((ret = allocate_method_table(method)))
1404                                 goto error3;
1405                         memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
1406                                mad_reg_req->oui, 3);
1407                         goto check_in_use;
1408                 }
1409         }
1410         printk(KERN_ERR PFX "All OUI slots in use\n");
1411         goto error3;
1412
1413 check_in_use:
1414         /* Now, make sure methods are not already in use */
1415         if (method_in_use(method, mad_reg_req))
1416                 goto error4;
1417
1418         /* Finally, add in methods being registered */
1419         for (i = find_first_bit(mad_reg_req->method_mask,
1420                                 IB_MGMT_MAX_METHODS);
1421              i < IB_MGMT_MAX_METHODS;
1422              i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1423                                1+i)) {
1424                 (*method)->agent[i] = agent_priv;
1425         }
1426         return 0;
1427
1428 error4:
1429         /* Remove any methods for this mad agent */
1430         remove_methods_mad_agent(*method, agent_priv);
1431         /* Now, check to see if there are any methods in use */
1432         if (!check_method_table(*method)) {
1433                 /* If not, release management method table */
1434                 kfree(*method);
1435                 *method = NULL;
1436         }
1437         ret = -EINVAL;
1438 error3:
1439         if (vendor_class) {
1440                 (*vendor_table)->vendor_class[vclass] = NULL;
1441                 kfree(vendor_class);
1442         }
1443 error2:
1444         if (vendor) {
1445                 *vendor_table = NULL;
1446                 kfree(vendor);
1447         }
1448 error1:
1449         return ret;
1450 }
1451
1452 static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv)
1453 {
1454         struct ib_mad_port_private *port_priv;
1455         struct ib_mad_mgmt_class_table *class;
1456         struct ib_mad_mgmt_method_table *method;
1457         struct ib_mad_mgmt_vendor_class_table *vendor;
1458         struct ib_mad_mgmt_vendor_class *vendor_class;
1459         int index;
1460         u8 mgmt_class;
1461
1462         /*
1463          * Was MAD registration request supplied
1464          * with original registration ?
1465          */
1466         if (!agent_priv->reg_req) {
1467                 goto out;
1468         }
1469
1470         port_priv = agent_priv->qp_info->port_priv;
1471         mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class);
1472         class = port_priv->version[
1473                         agent_priv->reg_req->mgmt_class_version].class;
1474         if (!class)
1475                 goto vendor_check;
1476
1477         method = class->method_table[mgmt_class];
1478         if (method) {
1479                 /* Remove any methods for this mad agent */
1480                 remove_methods_mad_agent(method, agent_priv);
1481                 /* Now, check to see if there are any methods still in use */
1482                 if (!check_method_table(method)) {
1483                         /* If not, release management method table */
1484                          kfree(method);
1485                          class->method_table[mgmt_class] = NULL;
1486                          /* Any management classes left ? */
1487                         if (!check_class_table(class)) {
1488                                 /* If not, release management class table */
1489                                 kfree(class);
1490                                 port_priv->version[
1491                                         agent_priv->reg_req->
1492                                         mgmt_class_version].class = NULL;
1493                         }
1494                 }
1495         }
1496
1497 vendor_check:
1498         if (!is_vendor_class(mgmt_class))
1499                 goto out;
1500
1501         /* normalize mgmt_class to vendor range 2 */
1502         mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class);
1503         vendor = port_priv->version[
1504                         agent_priv->reg_req->mgmt_class_version].vendor;
1505
1506         if (!vendor)
1507                 goto out;
1508
1509         vendor_class = vendor->vendor_class[mgmt_class];
1510         if (vendor_class) {
1511                 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui);
1512                 if (index < 0)
1513                         goto out;
1514                 method = vendor_class->method_table[index];
1515                 if (method) {
1516                         /* Remove any methods for this mad agent */
1517                         remove_methods_mad_agent(method, agent_priv);
1518                         /*
1519                          * Now, check to see if there are
1520                          * any methods still in use
1521                          */
1522                         if (!check_method_table(method)) {
1523                                 /* If not, release management method table */
1524                                 kfree(method);
1525                                 vendor_class->method_table[index] = NULL;
1526                                 memset(vendor_class->oui[index], 0, 3);
1527                                 /* Any OUIs left ? */
1528                                 if (!check_vendor_class(vendor_class)) {
1529                                         /* If not, release vendor class table */
1530                                         kfree(vendor_class);
1531                                         vendor->vendor_class[mgmt_class] = NULL;
1532                                         /* Any other vendor classes left ? */
1533                                         if (!check_vendor_table(vendor)) {
1534                                                 kfree(vendor);
1535                                                 port_priv->version[
1536                                                         agent_priv->reg_req->
1537                                                         mgmt_class_version].
1538                                                         vendor = NULL;
1539                                         }
1540                                 }
1541                         }
1542                 }
1543         }
1544
1545 out:
1546         return;
1547 }
1548
1549 static struct ib_mad_agent_private *
1550 find_mad_agent(struct ib_mad_port_private *port_priv,
1551                struct ib_mad *mad)
1552 {
1553         struct ib_mad_agent_private *mad_agent = NULL;
1554         unsigned long flags;
1555
1556         spin_lock_irqsave(&port_priv->reg_lock, flags);
1557         if (ib_response_mad(mad)) {
1558                 u32 hi_tid;
1559                 struct ib_mad_agent_private *entry;
1560
1561                 /*
1562                  * Routing is based on high 32 bits of transaction ID
1563                  * of MAD.
1564                  */
1565                 hi_tid = be64_to_cpu(mad->mad_hdr.tid) >> 32;
1566                 list_for_each_entry(entry, &port_priv->agent_list, agent_list) {
1567                         if (entry->agent.hi_tid == hi_tid) {
1568                                 mad_agent = entry;
1569                                 break;
1570                         }
1571                 }
1572         } else {
1573                 struct ib_mad_mgmt_class_table *class;
1574                 struct ib_mad_mgmt_method_table *method;
1575                 struct ib_mad_mgmt_vendor_class_table *vendor;
1576                 struct ib_mad_mgmt_vendor_class *vendor_class;
1577                 struct ib_vendor_mad *vendor_mad;
1578                 int index;
1579
1580                 /*
1581                  * Routing is based on version, class, and method
1582                  * For "newer" vendor MADs, also based on OUI
1583                  */
1584                 if (mad->mad_hdr.class_version >= MAX_MGMT_VERSION)
1585                         goto out;
1586                 if (!is_vendor_class(mad->mad_hdr.mgmt_class)) {
1587                         class = port_priv->version[
1588                                         mad->mad_hdr.class_version].class;
1589                         if (!class)
1590                                 goto out;
1591                         method = class->method_table[convert_mgmt_class(
1592                                                         mad->mad_hdr.mgmt_class)];
1593                         if (method)
1594                                 mad_agent = method->agent[mad->mad_hdr.method &
1595                                                           ~IB_MGMT_METHOD_RESP];
1596                 } else {
1597                         vendor = port_priv->version[
1598                                         mad->mad_hdr.class_version].vendor;
1599                         if (!vendor)
1600                                 goto out;
1601                         vendor_class = vendor->vendor_class[vendor_class_index(
1602                                                 mad->mad_hdr.mgmt_class)];
1603                         if (!vendor_class)
1604                                 goto out;
1605                         /* Find matching OUI */
1606                         vendor_mad = (struct ib_vendor_mad *)mad;
1607                         index = find_vendor_oui(vendor_class, vendor_mad->oui);
1608                         if (index == -1)
1609                                 goto out;
1610                         method = vendor_class->method_table[index];
1611                         if (method) {
1612                                 mad_agent = method->agent[mad->mad_hdr.method &
1613                                                           ~IB_MGMT_METHOD_RESP];
1614                         }
1615                 }
1616         }
1617
1618         if (mad_agent) {
1619                 if (mad_agent->agent.recv_handler)
1620                         atomic_inc(&mad_agent->refcount);
1621                 else {
1622                         printk(KERN_NOTICE PFX "No receive handler for client "
1623                                "%p on port %d\n",
1624                                &mad_agent->agent, port_priv->port_num);
1625                         mad_agent = NULL;
1626                 }
1627         }
1628 out:
1629         spin_unlock_irqrestore(&port_priv->reg_lock, flags);
1630
1631         return mad_agent;
1632 }
1633
1634 static int validate_mad(struct ib_mad *mad, u32 qp_num)
1635 {
1636         int valid = 0;
1637
1638         /* Make sure MAD base version is understood */
1639         if (mad->mad_hdr.base_version != IB_MGMT_BASE_VERSION) {
1640                 printk(KERN_ERR PFX "MAD received with unsupported base "
1641                        "version %d\n", mad->mad_hdr.base_version);
1642                 goto out;
1643         }
1644
1645         /* Filter SMI packets sent to other than QP0 */
1646         if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
1647             (mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
1648                 if (qp_num == 0)
1649                         valid = 1;
1650         } else {
1651                 /* Filter GSI packets sent to QP0 */
1652                 if (qp_num != 0)
1653                         valid = 1;
1654         }
1655
1656 out:
1657         return valid;
1658 }
1659
1660 static int is_data_mad(struct ib_mad_agent_private *mad_agent_priv,
1661                        struct ib_mad_hdr *mad_hdr)
1662 {
1663         struct ib_rmpp_mad *rmpp_mad;
1664
1665         rmpp_mad = (struct ib_rmpp_mad *)mad_hdr;
1666         return !mad_agent_priv->agent.rmpp_version ||
1667                 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
1668                                     IB_MGMT_RMPP_FLAG_ACTIVE) ||
1669                 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA);
1670 }
1671
1672 static inline int rcv_has_same_class(struct ib_mad_send_wr_private *wr,
1673                                      struct ib_mad_recv_wc *rwc)
1674 {
1675         return ((struct ib_mad *)(wr->send_buf.mad))->mad_hdr.mgmt_class ==
1676                 rwc->recv_buf.mad->mad_hdr.mgmt_class;
1677 }
1678
1679 static inline int rcv_has_same_gid(struct ib_mad_agent_private *mad_agent_priv,
1680                                    struct ib_mad_send_wr_private *wr,
1681                                    struct ib_mad_recv_wc *rwc )
1682 {
1683         struct ib_ah_attr attr;
1684         u8 send_resp, rcv_resp;
1685         union ib_gid sgid;
1686         struct ib_device *device = mad_agent_priv->agent.device;
1687         u8 port_num = mad_agent_priv->agent.port_num;
1688         u8 lmc;
1689
1690         send_resp = ((struct ib_mad *)(wr->send_buf.mad))->
1691                      mad_hdr.method & IB_MGMT_METHOD_RESP;
1692         rcv_resp = rwc->recv_buf.mad->mad_hdr.method & IB_MGMT_METHOD_RESP;
1693
1694         if (send_resp == rcv_resp)
1695                 /* both requests, or both responses. GIDs different */
1696                 return 0;
1697
1698         if (ib_query_ah(wr->send_buf.ah, &attr))
1699                 /* Assume not equal, to avoid false positives. */
1700                 return 0;
1701
1702         if (!!(attr.ah_flags & IB_AH_GRH) !=
1703             !!(rwc->wc->wc_flags & IB_WC_GRH))
1704                 /* one has GID, other does not.  Assume different */
1705                 return 0;
1706
1707         if (!send_resp && rcv_resp) {
1708                 /* is request/response. */
1709                 if (!(attr.ah_flags & IB_AH_GRH)) {
1710                         if (ib_get_cached_lmc(device, port_num, &lmc))
1711                                 return 0;
1712                         return (!lmc || !((attr.src_path_bits ^
1713                                            rwc->wc->dlid_path_bits) &
1714                                           ((1 << lmc) - 1)));
1715                 } else {
1716                         if (ib_get_cached_gid(device, port_num,
1717                                               attr.grh.sgid_index, &sgid))
1718                                 return 0;
1719                         return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw,
1720                                        16);
1721                 }
1722         }
1723
1724         if (!(attr.ah_flags & IB_AH_GRH))
1725                 return attr.dlid == rwc->wc->slid;
1726         else
1727                 return !memcmp(attr.grh.dgid.raw, rwc->recv_buf.grh->sgid.raw,
1728                                16);
1729 }
1730
1731 static inline int is_direct(u8 class)
1732 {
1733         return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE);
1734 }
1735
1736 struct ib_mad_send_wr_private*
1737 ib_find_send_mad(struct ib_mad_agent_private *mad_agent_priv,
1738                  struct ib_mad_recv_wc *wc)
1739 {
1740         struct ib_mad_send_wr_private *wr;
1741         struct ib_mad *mad;
1742
1743         mad = (struct ib_mad *)wc->recv_buf.mad;
1744
1745         list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) {
1746                 if ((wr->tid == mad->mad_hdr.tid) &&
1747                     rcv_has_same_class(wr, wc) &&
1748                     /*
1749                      * Don't check GID for direct routed MADs.
1750                      * These might have permissive LIDs.
1751                      */
1752                     (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) ||
1753                      rcv_has_same_gid(mad_agent_priv, wr, wc)))
1754                         return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1755         }
1756
1757         /*
1758          * It's possible to receive the response before we've
1759          * been notified that the send has completed
1760          */
1761         list_for_each_entry(wr, &mad_agent_priv->send_list, agent_list) {
1762                 if (is_data_mad(mad_agent_priv, wr->send_buf.mad) &&
1763                     wr->tid == mad->mad_hdr.tid &&
1764                     wr->timeout &&
1765                     rcv_has_same_class(wr, wc) &&
1766                     /*
1767                      * Don't check GID for direct routed MADs.
1768                      * These might have permissive LIDs.
1769                      */
1770                     (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) ||
1771                      rcv_has_same_gid(mad_agent_priv, wr, wc)))
1772                         /* Verify request has not been canceled */
1773                         return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1774         }
1775         return NULL;
1776 }
1777
1778 void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr)
1779 {
1780         mad_send_wr->timeout = 0;
1781         if (mad_send_wr->refcount == 1)
1782                 list_move_tail(&mad_send_wr->agent_list,
1783                               &mad_send_wr->mad_agent_priv->done_list);
1784 }
1785
1786 static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
1787                                  struct ib_mad_recv_wc *mad_recv_wc)
1788 {
1789         struct ib_mad_send_wr_private *mad_send_wr;
1790         struct ib_mad_send_wc mad_send_wc;
1791         unsigned long flags;
1792
1793         INIT_LIST_HEAD(&mad_recv_wc->rmpp_list);
1794         list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list);
1795         if (mad_agent_priv->agent.rmpp_version) {
1796                 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv,
1797                                                       mad_recv_wc);
1798                 if (!mad_recv_wc) {
1799                         deref_mad_agent(mad_agent_priv);
1800                         return;
1801                 }
1802         }
1803
1804         /* Complete corresponding request */
1805         if (ib_response_mad(mad_recv_wc->recv_buf.mad)) {
1806                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1807                 mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc);
1808                 if (!mad_send_wr) {
1809                         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1810                         ib_free_recv_mad(mad_recv_wc);
1811                         deref_mad_agent(mad_agent_priv);
1812                         return;
1813                 }
1814                 ib_mark_mad_done(mad_send_wr);
1815                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1816
1817                 /* Defined behavior is to complete response before request */
1818                 mad_recv_wc->wc->wr_id = (unsigned long) &mad_send_wr->send_buf;
1819                 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1820                                                    mad_recv_wc);
1821                 atomic_dec(&mad_agent_priv->refcount);
1822
1823                 mad_send_wc.status = IB_WC_SUCCESS;
1824                 mad_send_wc.vendor_err = 0;
1825                 mad_send_wc.send_buf = &mad_send_wr->send_buf;
1826                 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
1827         } else {
1828                 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1829                                                    mad_recv_wc);
1830                 deref_mad_agent(mad_agent_priv);
1831         }
1832 }
1833
1834 static void ib_mad_recv_done_handler(struct ib_mad_port_private *port_priv,
1835                                      struct ib_wc *wc)
1836 {
1837         struct ib_mad_qp_info *qp_info;
1838         struct ib_mad_private_header *mad_priv_hdr;
1839         struct ib_mad_private *recv, *response;
1840         struct ib_mad_list_head *mad_list;
1841         struct ib_mad_agent_private *mad_agent;
1842
1843         response = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
1844         if (!response)
1845                 printk(KERN_ERR PFX "ib_mad_recv_done_handler no memory "
1846                        "for response buffer\n");
1847
1848         mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
1849         qp_info = mad_list->mad_queue->qp_info;
1850         dequeue_mad(mad_list);
1851
1852         mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header,
1853                                     mad_list);
1854         recv = container_of(mad_priv_hdr, struct ib_mad_private, header);
1855         ib_dma_unmap_single(port_priv->device,
1856                             recv->header.mapping,
1857                             sizeof(struct ib_mad_private) -
1858                               sizeof(struct ib_mad_private_header),
1859                             DMA_FROM_DEVICE);
1860
1861         /* Setup MAD receive work completion from "normal" work completion */
1862         recv->header.wc = *wc;
1863         recv->header.recv_wc.wc = &recv->header.wc;
1864         recv->header.recv_wc.mad_len = sizeof(struct ib_mad);
1865         recv->header.recv_wc.recv_buf.mad = &recv->mad.mad;
1866         recv->header.recv_wc.recv_buf.grh = &recv->grh;
1867
1868         if (atomic_read(&qp_info->snoop_count))
1869                 snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS);
1870
1871         /* Validate MAD */
1872         if (!validate_mad(&recv->mad.mad, qp_info->qp->qp_num))
1873                 goto out;
1874
1875         if (recv->mad.mad.mad_hdr.mgmt_class ==
1876             IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1877                 if (!smi_handle_dr_smp_recv(&recv->mad.smp,
1878                                             port_priv->device->node_type,
1879                                             port_priv->port_num,
1880                                             port_priv->device->phys_port_cnt))
1881                         goto out;
1882                 if (!smi_check_forward_dr_smp(&recv->mad.smp))
1883                         goto local;
1884                 if (!smi_handle_dr_smp_send(&recv->mad.smp,
1885                                             port_priv->device->node_type,
1886                                             port_priv->port_num))
1887                         goto out;
1888                 if (!smi_check_local_smp(&recv->mad.smp, port_priv->device))
1889                         goto out;
1890         }
1891
1892 local:
1893         /* Give driver "right of first refusal" on incoming MAD */
1894         if (port_priv->device->process_mad) {
1895                 int ret;
1896
1897                 if (!response) {
1898                         printk(KERN_ERR PFX "No memory for response MAD\n");
1899                         /*
1900                          * Is it better to assume that
1901                          * it wouldn't be processed ?
1902                          */
1903                         goto out;
1904                 }
1905
1906                 ret = port_priv->device->process_mad(port_priv->device, 0,
1907                                                      port_priv->port_num,
1908                                                      wc, &recv->grh,
1909                                                      &recv->mad.mad,
1910                                                      &response->mad.mad);
1911                 if (ret & IB_MAD_RESULT_SUCCESS) {
1912                         if (ret & IB_MAD_RESULT_CONSUMED)
1913                                 goto out;
1914                         if (ret & IB_MAD_RESULT_REPLY) {
1915                                 agent_send_response(&response->mad.mad,
1916                                                     &recv->grh, wc,
1917                                                     port_priv->device,
1918                                                     port_priv->port_num,
1919                                                     qp_info->qp->qp_num);
1920                                 goto out;
1921                         }
1922                 }
1923         }
1924
1925         mad_agent = find_mad_agent(port_priv, &recv->mad.mad);
1926         if (mad_agent) {
1927                 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
1928                 /*
1929                  * recv is freed up in error cases in ib_mad_complete_recv
1930                  * or via recv_handler in ib_mad_complete_recv()
1931                  */
1932                 recv = NULL;
1933         }
1934
1935 out:
1936         /* Post another receive request for this QP */
1937         if (response) {
1938                 ib_mad_post_receive_mads(qp_info, response);
1939                 if (recv)
1940                         kmem_cache_free(ib_mad_cache, recv);
1941         } else
1942                 ib_mad_post_receive_mads(qp_info, recv);
1943 }
1944
1945 static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
1946 {
1947         struct ib_mad_send_wr_private *mad_send_wr;
1948         unsigned long delay;
1949
1950         if (list_empty(&mad_agent_priv->wait_list)) {
1951                 cancel_delayed_work(&mad_agent_priv->timed_work);
1952         } else {
1953                 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
1954                                          struct ib_mad_send_wr_private,
1955                                          agent_list);
1956
1957                 if (time_after(mad_agent_priv->timeout,
1958                                mad_send_wr->timeout)) {
1959                         mad_agent_priv->timeout = mad_send_wr->timeout;
1960                         cancel_delayed_work(&mad_agent_priv->timed_work);
1961                         delay = mad_send_wr->timeout - jiffies;
1962                         if ((long)delay <= 0)
1963                                 delay = 1;
1964                         queue_delayed_work(mad_agent_priv->qp_info->
1965                                            port_priv->wq,
1966                                            &mad_agent_priv->timed_work, delay);
1967                 }
1968         }
1969 }
1970
1971 static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
1972 {
1973         struct ib_mad_agent_private *mad_agent_priv;
1974         struct ib_mad_send_wr_private *temp_mad_send_wr;
1975         struct list_head *list_item;
1976         unsigned long delay;
1977
1978         mad_agent_priv = mad_send_wr->mad_agent_priv;
1979         list_del(&mad_send_wr->agent_list);
1980
1981         delay = mad_send_wr->timeout;
1982         mad_send_wr->timeout += jiffies;
1983
1984         if (delay) {
1985                 list_for_each_prev(list_item, &mad_agent_priv->wait_list) {
1986                         temp_mad_send_wr = list_entry(list_item,
1987                                                 struct ib_mad_send_wr_private,
1988                                                 agent_list);
1989                         if (time_after(mad_send_wr->timeout,
1990                                        temp_mad_send_wr->timeout))
1991                                 break;
1992                 }
1993         }
1994         else
1995                 list_item = &mad_agent_priv->wait_list;
1996         list_add(&mad_send_wr->agent_list, list_item);
1997
1998         /* Reschedule a work item if we have a shorter timeout */
1999         if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list) {
2000                 cancel_delayed_work(&mad_agent_priv->timed_work);
2001                 queue_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2002                                    &mad_agent_priv->timed_work, delay);
2003         }
2004 }
2005
2006 void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr,
2007                           int timeout_ms)
2008 {
2009         mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2010         wait_for_response(mad_send_wr);
2011 }
2012
2013 /*
2014  * Process a send work completion
2015  */
2016 void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
2017                              struct ib_mad_send_wc *mad_send_wc)
2018 {
2019         struct ib_mad_agent_private     *mad_agent_priv;
2020         unsigned long                   flags;
2021         int                             ret;
2022
2023         mad_agent_priv = mad_send_wr->mad_agent_priv;
2024         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2025         if (mad_agent_priv->agent.rmpp_version) {
2026                 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc);
2027                 if (ret == IB_RMPP_RESULT_CONSUMED)
2028                         goto done;
2029         } else
2030                 ret = IB_RMPP_RESULT_UNHANDLED;
2031
2032         if (mad_send_wc->status != IB_WC_SUCCESS &&
2033             mad_send_wr->status == IB_WC_SUCCESS) {
2034                 mad_send_wr->status = mad_send_wc->status;
2035                 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2036         }
2037
2038         if (--mad_send_wr->refcount > 0) {
2039                 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout &&
2040                     mad_send_wr->status == IB_WC_SUCCESS) {
2041                         wait_for_response(mad_send_wr);
2042                 }
2043                 goto done;
2044         }
2045
2046         /* Remove send from MAD agent and notify client of completion */
2047         list_del(&mad_send_wr->agent_list);
2048         adjust_timeout(mad_agent_priv);
2049         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2050
2051         if (mad_send_wr->status != IB_WC_SUCCESS )
2052                 mad_send_wc->status = mad_send_wr->status;
2053         if (ret == IB_RMPP_RESULT_INTERNAL)
2054                 ib_rmpp_send_handler(mad_send_wc);
2055         else
2056                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2057                                                    mad_send_wc);
2058
2059         /* Release reference on agent taken when sending */
2060         deref_mad_agent(mad_agent_priv);
2061         return;
2062 done:
2063         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2064 }
2065
2066 static void ib_mad_send_done_handler(struct ib_mad_port_private *port_priv,
2067                                      struct ib_wc *wc)
2068 {
2069         struct ib_mad_send_wr_private   *mad_send_wr, *queued_send_wr;
2070         struct ib_mad_list_head         *mad_list;
2071         struct ib_mad_qp_info           *qp_info;
2072         struct ib_mad_queue             *send_queue;
2073         struct ib_send_wr               *bad_send_wr;
2074         struct ib_mad_send_wc           mad_send_wc;
2075         unsigned long flags;
2076         int ret;
2077
2078         mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2079         mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2080                                    mad_list);
2081         send_queue = mad_list->mad_queue;
2082         qp_info = send_queue->qp_info;
2083
2084 retry:
2085         ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2086                             mad_send_wr->header_mapping,
2087                             mad_send_wr->sg_list[0].length, DMA_TO_DEVICE);
2088         ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2089                             mad_send_wr->payload_mapping,
2090                             mad_send_wr->sg_list[1].length, DMA_TO_DEVICE);
2091         queued_send_wr = NULL;
2092         spin_lock_irqsave(&send_queue->lock, flags);
2093         list_del(&mad_list->list);
2094
2095         /* Move queued send to the send queue */
2096         if (send_queue->count-- > send_queue->max_active) {
2097                 mad_list = container_of(qp_info->overflow_list.next,
2098                                         struct ib_mad_list_head, list);
2099                 queued_send_wr = container_of(mad_list,
2100                                         struct ib_mad_send_wr_private,
2101                                         mad_list);
2102                 list_move_tail(&mad_list->list, &send_queue->list);
2103         }
2104         spin_unlock_irqrestore(&send_queue->lock, flags);
2105
2106         mad_send_wc.send_buf = &mad_send_wr->send_buf;
2107         mad_send_wc.status = wc->status;
2108         mad_send_wc.vendor_err = wc->vendor_err;
2109         if (atomic_read(&qp_info->snoop_count))
2110                 snoop_send(qp_info, &mad_send_wr->send_buf, &mad_send_wc,
2111                            IB_MAD_SNOOP_SEND_COMPLETIONS);
2112         ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
2113
2114         if (queued_send_wr) {
2115                 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr,
2116                                    &bad_send_wr);
2117                 if (ret) {
2118                         printk(KERN_ERR PFX "ib_post_send failed: %d\n", ret);
2119                         mad_send_wr = queued_send_wr;
2120                         wc->status = IB_WC_LOC_QP_OP_ERR;
2121                         goto retry;
2122                 }
2123         }
2124 }
2125
2126 static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info)
2127 {
2128         struct ib_mad_send_wr_private *mad_send_wr;
2129         struct ib_mad_list_head *mad_list;
2130         unsigned long flags;
2131
2132         spin_lock_irqsave(&qp_info->send_queue.lock, flags);
2133         list_for_each_entry(mad_list, &qp_info->send_queue.list, list) {
2134                 mad_send_wr = container_of(mad_list,
2135                                            struct ib_mad_send_wr_private,
2136                                            mad_list);
2137                 mad_send_wr->retry = 1;
2138         }
2139         spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
2140 }
2141
2142 static void mad_error_handler(struct ib_mad_port_private *port_priv,
2143                               struct ib_wc *wc)
2144 {
2145         struct ib_mad_list_head *mad_list;
2146         struct ib_mad_qp_info *qp_info;
2147         struct ib_mad_send_wr_private *mad_send_wr;
2148         int ret;
2149
2150         /* Determine if failure was a send or receive */
2151         mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2152         qp_info = mad_list->mad_queue->qp_info;
2153         if (mad_list->mad_queue == &qp_info->recv_queue)
2154                 /*
2155                  * Receive errors indicate that the QP has entered the error
2156                  * state - error handling/shutdown code will cleanup
2157                  */
2158                 return;
2159
2160         /*
2161          * Send errors will transition the QP to SQE - move
2162          * QP to RTS and repost flushed work requests
2163          */
2164         mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2165                                    mad_list);
2166         if (wc->status == IB_WC_WR_FLUSH_ERR) {
2167                 if (mad_send_wr->retry) {
2168                         /* Repost send */
2169                         struct ib_send_wr *bad_send_wr;
2170
2171                         mad_send_wr->retry = 0;
2172                         ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr,
2173                                         &bad_send_wr);
2174                         if (ret)
2175                                 ib_mad_send_done_handler(port_priv, wc);
2176                 } else
2177                         ib_mad_send_done_handler(port_priv, wc);
2178         } else {
2179                 struct ib_qp_attr *attr;
2180
2181                 /* Transition QP to RTS and fail offending send */
2182                 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2183                 if (attr) {
2184                         attr->qp_state = IB_QPS_RTS;
2185                         attr->cur_qp_state = IB_QPS_SQE;
2186                         ret = ib_modify_qp(qp_info->qp, attr,
2187                                            IB_QP_STATE | IB_QP_CUR_STATE);
2188                         kfree(attr);
2189                         if (ret)
2190                                 printk(KERN_ERR PFX "mad_error_handler - "
2191                                        "ib_modify_qp to RTS : %d\n", ret);
2192                         else
2193                                 mark_sends_for_retry(qp_info);
2194                 }
2195                 ib_mad_send_done_handler(port_priv, wc);
2196         }
2197 }
2198
2199 /*
2200  * IB MAD completion callback
2201  */
2202 static void ib_mad_completion_handler(struct work_struct *work)
2203 {
2204         struct ib_mad_port_private *port_priv;
2205         struct ib_wc wc;
2206
2207         port_priv = container_of(work, struct ib_mad_port_private, work);
2208         ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2209
2210         while (ib_poll_cq(port_priv->cq, 1, &wc) == 1) {
2211                 if (wc.status == IB_WC_SUCCESS) {
2212                         switch (wc.opcode) {
2213                         case IB_WC_SEND:
2214                                 ib_mad_send_done_handler(port_priv, &wc);
2215                                 break;
2216                         case IB_WC_RECV:
2217                                 ib_mad_recv_done_handler(port_priv, &wc);
2218                                 break;
2219                         default:
2220                                 BUG_ON(1);
2221                                 break;
2222                         }
2223                 } else
2224                         mad_error_handler(port_priv, &wc);
2225         }
2226 }
2227
2228 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
2229 {
2230         unsigned long flags;
2231         struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr;
2232         struct ib_mad_send_wc mad_send_wc;
2233         struct list_head cancel_list;
2234
2235         INIT_LIST_HEAD(&cancel_list);
2236
2237         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2238         list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2239                                  &mad_agent_priv->send_list, agent_list) {
2240                 if (mad_send_wr->status == IB_WC_SUCCESS) {
2241                         mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2242                         mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2243                 }
2244         }
2245
2246         /* Empty wait list to prevent receives from finding a request */
2247         list_splice_init(&mad_agent_priv->wait_list, &cancel_list);
2248         /* Empty local completion list as well */
2249         list_splice_init(&mad_agent_priv->local_list, &cancel_list);
2250         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2251
2252         /* Report all cancelled requests */
2253         mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
2254         mad_send_wc.vendor_err = 0;
2255
2256         list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2257                                  &cancel_list, agent_list) {
2258                 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2259                 list_del(&mad_send_wr->agent_list);
2260                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2261                                                    &mad_send_wc);
2262                 atomic_dec(&mad_agent_priv->refcount);
2263         }
2264 }
2265
2266 static struct ib_mad_send_wr_private*
2267 find_send_wr(struct ib_mad_agent_private *mad_agent_priv,
2268              struct ib_mad_send_buf *send_buf)
2269 {
2270         struct ib_mad_send_wr_private *mad_send_wr;
2271
2272         list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
2273                             agent_list) {
2274                 if (&mad_send_wr->send_buf == send_buf)
2275                         return mad_send_wr;
2276         }
2277
2278         list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
2279                             agent_list) {
2280                 if (is_data_mad(mad_agent_priv, mad_send_wr->send_buf.mad) &&
2281                     &mad_send_wr->send_buf == send_buf)
2282                         return mad_send_wr;
2283         }
2284         return NULL;
2285 }
2286
2287 int ib_modify_mad(struct ib_mad_agent *mad_agent,
2288                   struct ib_mad_send_buf *send_buf, u32 timeout_ms)
2289 {
2290         struct ib_mad_agent_private *mad_agent_priv;
2291         struct ib_mad_send_wr_private *mad_send_wr;
2292         unsigned long flags;
2293         int active;
2294
2295         mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
2296                                       agent);
2297         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2298         mad_send_wr = find_send_wr(mad_agent_priv, send_buf);
2299         if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) {
2300                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2301                 return -EINVAL;
2302         }
2303
2304         active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1);
2305         if (!timeout_ms) {
2306                 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2307                 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2308         }
2309
2310         mad_send_wr->send_buf.timeout_ms = timeout_ms;
2311         if (active)
2312                 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2313         else
2314                 ib_reset_mad_timeout(mad_send_wr, timeout_ms);
2315
2316         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2317         return 0;
2318 }
2319 EXPORT_SYMBOL(ib_modify_mad);
2320
2321 void ib_cancel_mad(struct ib_mad_agent *mad_agent,
2322                    struct ib_mad_send_buf *send_buf)
2323 {
2324         ib_modify_mad(mad_agent, send_buf, 0);
2325 }
2326 EXPORT_SYMBOL(ib_cancel_mad);
2327
2328 static void local_completions(struct work_struct *work)
2329 {
2330         struct ib_mad_agent_private *mad_agent_priv;
2331         struct ib_mad_local_private *local;
2332         struct ib_mad_agent_private *recv_mad_agent;
2333         unsigned long flags;
2334         int recv = 0;
2335         struct ib_wc wc;
2336         struct ib_mad_send_wc mad_send_wc;
2337
2338         mad_agent_priv =
2339                 container_of(work, struct ib_mad_agent_private, local_work);
2340
2341         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2342         while (!list_empty(&mad_agent_priv->local_list)) {
2343                 local = list_entry(mad_agent_priv->local_list.next,
2344                                    struct ib_mad_local_private,
2345                                    completion_list);
2346                 list_del(&local->completion_list);
2347                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2348                 if (local->mad_priv) {
2349                         recv_mad_agent = local->recv_mad_agent;
2350                         if (!recv_mad_agent) {
2351                                 printk(KERN_ERR PFX "No receive MAD agent for local completion\n");
2352                                 goto local_send_completion;
2353                         }
2354
2355                         recv = 1;
2356                         /*
2357                          * Defined behavior is to complete response
2358                          * before request
2359                          */
2360                         build_smp_wc(recv_mad_agent->agent.qp,
2361                                      (unsigned long) local->mad_send_wr,
2362                                      be16_to_cpu(IB_LID_PERMISSIVE),
2363                                      0, recv_mad_agent->agent.port_num, &wc);
2364
2365                         local->mad_priv->header.recv_wc.wc = &wc;
2366                         local->mad_priv->header.recv_wc.mad_len =
2367                                                 sizeof(struct ib_mad);
2368                         INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list);
2369                         list_add(&local->mad_priv->header.recv_wc.recv_buf.list,
2370                                  &local->mad_priv->header.recv_wc.rmpp_list);
2371                         local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
2372                         local->mad_priv->header.recv_wc.recv_buf.mad =
2373                                                 &local->mad_priv->mad.mad;
2374                         if (atomic_read(&recv_mad_agent->qp_info->snoop_count))
2375                                 snoop_recv(recv_mad_agent->qp_info,
2376                                           &local->mad_priv->header.recv_wc,
2377                                            IB_MAD_SNOOP_RECVS);
2378                         recv_mad_agent->agent.recv_handler(
2379                                                 &recv_mad_agent->agent,
2380                                                 &local->mad_priv->header.recv_wc);
2381                         spin_lock_irqsave(&recv_mad_agent->lock, flags);
2382                         atomic_dec(&recv_mad_agent->refcount);
2383                         spin_unlock_irqrestore(&recv_mad_agent->lock, flags);
2384                 }
2385
2386 local_send_completion:
2387                 /* Complete send */
2388                 mad_send_wc.status = IB_WC_SUCCESS;
2389                 mad_send_wc.vendor_err = 0;
2390                 mad_send_wc.send_buf = &local->mad_send_wr->send_buf;
2391                 if (atomic_read(&mad_agent_priv->qp_info->snoop_count))
2392                         snoop_send(mad_agent_priv->qp_info,
2393                                    &local->mad_send_wr->send_buf,
2394                                    &mad_send_wc, IB_MAD_SNOOP_SEND_COMPLETIONS);
2395                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2396                                                    &mad_send_wc);
2397
2398                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2399                 atomic_dec(&mad_agent_priv->refcount);
2400                 if (!recv)
2401                         kmem_cache_free(ib_mad_cache, local->mad_priv);
2402                 kfree(local);
2403         }
2404         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2405 }
2406
2407 static int retry_send(struct ib_mad_send_wr_private *mad_send_wr)
2408 {
2409         int ret;
2410
2411         if (!mad_send_wr->retries--)
2412                 return -ETIMEDOUT;
2413
2414         mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
2415
2416         if (mad_send_wr->mad_agent_priv->agent.rmpp_version) {
2417                 ret = ib_retry_rmpp(mad_send_wr);
2418                 switch (ret) {
2419                 case IB_RMPP_RESULT_UNHANDLED:
2420                         ret = ib_send_mad(mad_send_wr);
2421                         break;
2422                 case IB_RMPP_RESULT_CONSUMED:
2423                         ret = 0;
2424                         break;
2425                 default:
2426                         ret = -ECOMM;
2427                         break;
2428                 }
2429         } else
2430                 ret = ib_send_mad(mad_send_wr);
2431
2432         if (!ret) {
2433                 mad_send_wr->refcount++;
2434                 list_add_tail(&mad_send_wr->agent_list,
2435                               &mad_send_wr->mad_agent_priv->send_list);
2436         }
2437         return ret;
2438 }
2439
2440 static void timeout_sends(struct work_struct *work)
2441 {
2442         struct ib_mad_agent_private *mad_agent_priv;
2443         struct ib_mad_send_wr_private *mad_send_wr;
2444         struct ib_mad_send_wc mad_send_wc;
2445         unsigned long flags, delay;
2446
2447         mad_agent_priv = container_of(work, struct ib_mad_agent_private,
2448                                       timed_work.work);
2449         mad_send_wc.vendor_err = 0;
2450
2451         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2452         while (!list_empty(&mad_agent_priv->wait_list)) {
2453                 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2454                                          struct ib_mad_send_wr_private,
2455                                          agent_list);
2456
2457                 if (time_after(mad_send_wr->timeout, jiffies)) {
2458                         delay = mad_send_wr->timeout - jiffies;
2459                         if ((long)delay <= 0)
2460                                 delay = 1;
2461                         queue_delayed_work(mad_agent_priv->qp_info->
2462                                            port_priv->wq,
2463                                            &mad_agent_priv->timed_work, delay);
2464                         break;
2465                 }
2466
2467                 list_del(&mad_send_wr->agent_list);
2468                 if (mad_send_wr->status == IB_WC_SUCCESS &&
2469                     !retry_send(mad_send_wr))
2470                         continue;
2471
2472                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2473
2474                 if (mad_send_wr->status == IB_WC_SUCCESS)
2475                         mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR;
2476                 else
2477                         mad_send_wc.status = mad_send_wr->status;
2478                 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2479                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2480                                                    &mad_send_wc);
2481
2482                 atomic_dec(&mad_agent_priv->refcount);
2483                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2484         }
2485         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2486 }
2487
2488 static void ib_mad_thread_completion_handler(struct ib_cq *cq, void *arg)
2489 {
2490         struct ib_mad_port_private *port_priv = cq->cq_context;
2491         unsigned long flags;
2492
2493         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2494         if (!list_empty(&port_priv->port_list))
2495                 queue_work(port_priv->wq, &port_priv->work);
2496         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2497 }
2498
2499 /*
2500  * Allocate receive MADs and post receive WRs for them
2501  */
2502 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
2503                                     struct ib_mad_private *mad)
2504 {
2505         unsigned long flags;
2506         int post, ret;
2507         struct ib_mad_private *mad_priv;
2508         struct ib_sge sg_list;
2509         struct ib_recv_wr recv_wr, *bad_recv_wr;
2510         struct ib_mad_queue *recv_queue = &qp_info->recv_queue;
2511
2512         /* Initialize common scatter list fields */
2513         sg_list.length = sizeof *mad_priv - sizeof mad_priv->header;
2514         sg_list.lkey = (*qp_info->port_priv->mr).lkey;
2515
2516         /* Initialize common receive WR fields */
2517         recv_wr.next = NULL;
2518         recv_wr.sg_list = &sg_list;
2519         recv_wr.num_sge = 1;
2520
2521         do {
2522                 /* Allocate and map receive buffer */
2523                 if (mad) {
2524                         mad_priv = mad;
2525                         mad = NULL;
2526                 } else {
2527                         mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
2528                         if (!mad_priv) {
2529                                 printk(KERN_ERR PFX "No memory for receive buffer\n");
2530                                 ret = -ENOMEM;
2531                                 break;
2532                         }
2533                 }
2534                 sg_list.addr = ib_dma_map_single(qp_info->port_priv->device,
2535                                                  &mad_priv->grh,
2536                                                  sizeof *mad_priv -
2537                                                    sizeof mad_priv->header,
2538                                                  DMA_FROM_DEVICE);
2539                 mad_priv->header.mapping = sg_list.addr;
2540                 recv_wr.wr_id = (unsigned long)&mad_priv->header.mad_list;
2541                 mad_priv->header.mad_list.mad_queue = recv_queue;
2542
2543                 /* Post receive WR */
2544                 spin_lock_irqsave(&recv_queue->lock, flags);
2545                 post = (++recv_queue->count < recv_queue->max_active);
2546                 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list);
2547                 spin_unlock_irqrestore(&recv_queue->lock, flags);
2548                 ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr);
2549                 if (ret) {
2550                         spin_lock_irqsave(&recv_queue->lock, flags);
2551                         list_del(&mad_priv->header.mad_list.list);
2552                         recv_queue->count--;
2553                         spin_unlock_irqrestore(&recv_queue->lock, flags);
2554                         ib_dma_unmap_single(qp_info->port_priv->device,
2555                                             mad_priv->header.mapping,
2556                                             sizeof *mad_priv -
2557                                               sizeof mad_priv->header,
2558                                             DMA_FROM_DEVICE);
2559                         kmem_cache_free(ib_mad_cache, mad_priv);
2560                         printk(KERN_ERR PFX "ib_post_recv failed: %d\n", ret);
2561                         break;
2562                 }
2563         } while (post);
2564
2565         return ret;
2566 }
2567
2568 /*
2569  * Return all the posted receive MADs
2570  */
2571 static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info)
2572 {
2573         struct ib_mad_private_header *mad_priv_hdr;
2574         struct ib_mad_private *recv;
2575         struct ib_mad_list_head *mad_list;
2576
2577         while (!list_empty(&qp_info->recv_queue.list)) {
2578
2579                 mad_list = list_entry(qp_info->recv_queue.list.next,
2580                                       struct ib_mad_list_head, list);
2581                 mad_priv_hdr = container_of(mad_list,
2582                                             struct ib_mad_private_header,
2583                                             mad_list);
2584                 recv = container_of(mad_priv_hdr, struct ib_mad_private,
2585                                     header);
2586
2587                 /* Remove from posted receive MAD list */
2588                 list_del(&mad_list->list);
2589
2590                 ib_dma_unmap_single(qp_info->port_priv->device,
2591                                     recv->header.mapping,
2592                                     sizeof(struct ib_mad_private) -
2593                                       sizeof(struct ib_mad_private_header),
2594                                     DMA_FROM_DEVICE);
2595                 kmem_cache_free(ib_mad_cache, recv);
2596         }
2597
2598         qp_info->recv_queue.count = 0;
2599 }
2600
2601 /*
2602  * Start the port
2603  */
2604 static int ib_mad_port_start(struct ib_mad_port_private *port_priv)
2605 {
2606         int ret, i;
2607         struct ib_qp_attr *attr;
2608         struct ib_qp *qp;
2609
2610         attr = kmalloc(sizeof *attr, GFP_KERNEL);
2611         if (!attr) {
2612                 printk(KERN_ERR PFX "Couldn't kmalloc ib_qp_attr\n");
2613                 return -ENOMEM;
2614         }
2615
2616         for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2617                 qp = port_priv->qp_info[i].qp;
2618                 /*
2619                  * PKey index for QP1 is irrelevant but
2620                  * one is needed for the Reset to Init transition
2621                  */
2622                 attr->qp_state = IB_QPS_INIT;
2623                 attr->pkey_index = 0;
2624                 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY;
2625                 ret = ib_modify_qp(qp, attr, IB_QP_STATE |
2626                                              IB_QP_PKEY_INDEX | IB_QP_QKEY);
2627                 if (ret) {
2628                         printk(KERN_ERR PFX "Couldn't change QP%d state to "
2629                                "INIT: %d\n", i, ret);
2630                         goto out;
2631                 }
2632
2633                 attr->qp_state = IB_QPS_RTR;
2634                 ret = ib_modify_qp(qp, attr, IB_QP_STATE);
2635                 if (ret) {
2636                         printk(KERN_ERR PFX "Couldn't change QP%d state to "
2637                                "RTR: %d\n", i, ret);
2638                         goto out;
2639                 }
2640
2641                 attr->qp_state = IB_QPS_RTS;
2642                 attr->sq_psn = IB_MAD_SEND_Q_PSN;
2643                 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN);
2644                 if (ret) {
2645                         printk(KERN_ERR PFX "Couldn't change QP%d state to "
2646                                "RTS: %d\n", i, ret);
2647                         goto out;
2648                 }
2649         }
2650
2651         ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2652         if (ret) {
2653                 printk(KERN_ERR PFX "Failed to request completion "
2654                        "notification: %d\n", ret);
2655                 goto out;
2656         }
2657
2658         for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2659                 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
2660                 if (ret) {
2661                         printk(KERN_ERR PFX "Couldn't post receive WRs\n");
2662                         goto out;
2663                 }
2664         }
2665 out:
2666         kfree(attr);
2667         return ret;
2668 }
2669
2670 static void qp_event_handler(struct ib_event *event, void *qp_context)
2671 {
2672         struct ib_mad_qp_info   *qp_info = qp_context;
2673
2674         /* It's worse than that! He's dead, Jim! */
2675         printk(KERN_ERR PFX "Fatal error (%d) on MAD QP (%d)\n",
2676                 event->event, qp_info->qp->qp_num);
2677 }
2678
2679 static void init_mad_queue(struct ib_mad_qp_info *qp_info,
2680                            struct ib_mad_queue *mad_queue)
2681 {
2682         mad_queue->qp_info = qp_info;
2683         mad_queue->count = 0;
2684         spin_lock_init(&mad_queue->lock);
2685         INIT_LIST_HEAD(&mad_queue->list);
2686 }
2687
2688 static void init_mad_qp(struct ib_mad_port_private *port_priv,
2689                         struct ib_mad_qp_info *qp_info)
2690 {
2691         qp_info->port_priv = port_priv;
2692         init_mad_queue(qp_info, &qp_info->send_queue);
2693         init_mad_queue(qp_info, &qp_info->recv_queue);
2694         INIT_LIST_HEAD(&qp_info->overflow_list);
2695         spin_lock_init(&qp_info->snoop_lock);
2696         qp_info->snoop_table = NULL;
2697         qp_info->snoop_table_size = 0;
2698         atomic_set(&qp_info->snoop_count, 0);
2699 }
2700
2701 static int create_mad_qp(struct ib_mad_qp_info *qp_info,
2702                          enum ib_qp_type qp_type)
2703 {
2704         struct ib_qp_init_attr  qp_init_attr;
2705         int ret;
2706
2707         memset(&qp_init_attr, 0, sizeof qp_init_attr);
2708         qp_init_attr.send_cq = qp_info->port_priv->cq;
2709         qp_init_attr.recv_cq = qp_info->port_priv->cq;
2710         qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
2711         qp_init_attr.cap.max_send_wr = IB_MAD_QP_SEND_SIZE;
2712         qp_init_attr.cap.max_recv_wr = IB_MAD_QP_RECV_SIZE;
2713         qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG;
2714         qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG;
2715         qp_init_attr.qp_type = qp_type;
2716         qp_init_attr.port_num = qp_info->port_priv->port_num;
2717         qp_init_attr.qp_context = qp_info;
2718         qp_init_attr.event_handler = qp_event_handler;
2719         qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr);
2720         if (IS_ERR(qp_info->qp)) {
2721                 printk(KERN_ERR PFX "Couldn't create ib_mad QP%d\n",
2722                        get_spl_qp_index(qp_type));
2723                 ret = PTR_ERR(qp_info->qp);
2724                 goto error;
2725         }
2726         /* Use minimum queue sizes unless the CQ is resized */
2727         qp_info->send_queue.max_active = IB_MAD_QP_SEND_SIZE;
2728         qp_info->recv_queue.max_active = IB_MAD_QP_RECV_SIZE;
2729         return 0;
2730
2731 error:
2732         return ret;
2733 }
2734
2735 static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
2736 {
2737         ib_destroy_qp(qp_info->qp);
2738         kfree(qp_info->snoop_table);
2739 }
2740
2741 /*
2742  * Open the port
2743  * Create the QP, PD, MR, and CQ if needed
2744  */
2745 static int ib_mad_port_open(struct ib_device *device,
2746                             int port_num)
2747 {
2748         int ret, cq_size;
2749         struct ib_mad_port_private *port_priv;
2750         unsigned long flags;
2751         char name[sizeof "ib_mad123"];
2752
2753         /* Create new device info */
2754         port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
2755         if (!port_priv) {
2756                 printk(KERN_ERR PFX "No memory for ib_mad_port_private\n");
2757                 return -ENOMEM;
2758         }
2759
2760         port_priv->device = device;
2761         port_priv->port_num = port_num;
2762         spin_lock_init(&port_priv->reg_lock);
2763         INIT_LIST_HEAD(&port_priv->agent_list);
2764         init_mad_qp(port_priv, &port_priv->qp_info[0]);
2765         init_mad_qp(port_priv, &port_priv->qp_info[1]);
2766
2767         cq_size = (IB_MAD_QP_SEND_SIZE + IB_MAD_QP_RECV_SIZE) * 2;
2768         port_priv->cq = ib_create_cq(port_priv->device,
2769                                      ib_mad_thread_completion_handler,
2770                                      NULL, port_priv, cq_size);
2771         if (IS_ERR(port_priv->cq)) {
2772                 printk(KERN_ERR PFX "Couldn't create ib_mad CQ\n");
2773                 ret = PTR_ERR(port_priv->cq);
2774                 goto error3;
2775         }
2776
2777         port_priv->pd = ib_alloc_pd(device);
2778         if (IS_ERR(port_priv->pd)) {
2779                 printk(KERN_ERR PFX "Couldn't create ib_mad PD\n");
2780                 ret = PTR_ERR(port_priv->pd);
2781                 goto error4;
2782         }
2783
2784         port_priv->mr = ib_get_dma_mr(port_priv->pd, IB_ACCESS_LOCAL_WRITE);
2785         if (IS_ERR(port_priv->mr)) {
2786                 printk(KERN_ERR PFX "Couldn't get ib_mad DMA MR\n");
2787                 ret = PTR_ERR(port_priv->mr);
2788                 goto error5;
2789         }
2790
2791         ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
2792         if (ret)
2793                 goto error6;
2794         ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI);
2795         if (ret)
2796                 goto error7;
2797
2798         snprintf(name, sizeof name, "ib_mad%d", port_num);
2799         port_priv->wq = create_singlethread_workqueue(name);
2800         if (!port_priv->wq) {
2801                 ret = -ENOMEM;
2802                 goto error8;
2803         }
2804         INIT_WORK(&port_priv->work, ib_mad_completion_handler);
2805
2806         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2807         list_add_tail(&port_priv->port_list, &ib_mad_port_list);
2808         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2809
2810         ret = ib_mad_port_start(port_priv);
2811         if (ret) {
2812                 printk(KERN_ERR PFX "Couldn't start port\n");
2813                 goto error9;
2814         }
2815
2816         return 0;
2817
2818 error9:
2819         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2820         list_del_init(&port_priv->port_list);
2821         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2822
2823         destroy_workqueue(port_priv->wq);
2824 error8:
2825         destroy_mad_qp(&port_priv->qp_info[1]);
2826 error7:
2827         destroy_mad_qp(&port_priv->qp_info[0]);
2828 error6:
2829         ib_dereg_mr(port_priv->mr);
2830 error5:
2831         ib_dealloc_pd(port_priv->pd);
2832 error4:
2833         ib_destroy_cq(port_priv->cq);
2834         cleanup_recv_queue(&port_priv->qp_info[1]);
2835         cleanup_recv_queue(&port_priv->qp_info[0]);
2836 error3:
2837         kfree(port_priv);
2838
2839         return ret;
2840 }
2841
2842 /*
2843  * Close the port
2844  * If there are no classes using the port, free the port
2845  * resources (CQ, MR, PD, QP) and remove the port's info structure
2846  */
2847 static int ib_mad_port_close(struct ib_device *device, int port_num)
2848 {
2849         struct ib_mad_port_private *port_priv;
2850         unsigned long flags;
2851
2852         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2853         port_priv = __ib_get_mad_port(device, port_num);
2854         if (port_priv == NULL) {
2855                 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2856                 printk(KERN_ERR PFX "Port %d not found\n", port_num);
2857                 return -ENODEV;
2858         }
2859         list_del_init(&port_priv->port_list);
2860         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2861
2862         destroy_workqueue(port_priv->wq);
2863         destroy_mad_qp(&port_priv->qp_info[1]);
2864         destroy_mad_qp(&port_priv->qp_info[0]);
2865         ib_dereg_mr(port_priv->mr);
2866         ib_dealloc_pd(port_priv->pd);
2867         ib_destroy_cq(port_priv->cq);
2868         cleanup_recv_queue(&port_priv->qp_info[1]);
2869         cleanup_recv_queue(&port_priv->qp_info[0]);
2870         /* XXX: Handle deallocation of MAD registration tables */
2871
2872         kfree(port_priv);
2873
2874         return 0;
2875 }
2876
2877 static void ib_mad_init_device(struct ib_device *device)
2878 {
2879         int start, end, i;
2880
2881         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
2882                 return;
2883
2884         if (device->node_type == RDMA_NODE_IB_SWITCH) {
2885                 start = 0;
2886                 end   = 0;
2887         } else {
2888                 start = 1;
2889                 end   = device->phys_port_cnt;
2890         }
2891
2892         for (i = start; i <= end; i++) {
2893                 if (ib_mad_port_open(device, i)) {
2894                         printk(KERN_ERR PFX "Couldn't open %s port %d\n",
2895                                device->name, i);
2896                         goto error;
2897                 }
2898                 if (ib_agent_port_open(device, i)) {
2899                         printk(KERN_ERR PFX "Couldn't open %s port %d "
2900                                "for agents\n",
2901                                device->name, i);
2902                         goto error_agent;
2903                 }
2904         }
2905         return;
2906
2907 error_agent:
2908         if (ib_mad_port_close(device, i))
2909                 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2910                        device->name, i);
2911
2912 error:
2913         i--;
2914
2915         while (i >= start) {
2916                 if (ib_agent_port_close(device, i))
2917                         printk(KERN_ERR PFX "Couldn't close %s port %d "
2918                                "for agents\n",
2919                                device->name, i);
2920                 if (ib_mad_port_close(device, i))
2921                         printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2922                                device->name, i);
2923                 i--;
2924         }
2925 }
2926
2927 static void ib_mad_remove_device(struct ib_device *device)
2928 {
2929         int i, num_ports, cur_port;
2930
2931         if (device->node_type == RDMA_NODE_IB_SWITCH) {
2932                 num_ports = 1;
2933                 cur_port = 0;
2934         } else {
2935                 num_ports = device->phys_port_cnt;
2936                 cur_port = 1;
2937         }
2938         for (i = 0; i < num_ports; i++, cur_port++) {
2939                 if (ib_agent_port_close(device, cur_port))
2940                         printk(KERN_ERR PFX "Couldn't close %s port %d "
2941                                "for agents\n",
2942                                device->name, cur_port);
2943                 if (ib_mad_port_close(device, cur_port))
2944                         printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2945                                device->name, cur_port);
2946         }
2947 }
2948
2949 static struct ib_client mad_client = {
2950         .name   = "mad",
2951         .add = ib_mad_init_device,
2952         .remove = ib_mad_remove_device
2953 };
2954
2955 static int __init ib_mad_init_module(void)
2956 {
2957         int ret;
2958
2959         spin_lock_init(&ib_mad_port_list_lock);
2960
2961         ib_mad_cache = kmem_cache_create("ib_mad",
2962                                          sizeof(struct ib_mad_private),
2963                                          0,
2964                                          SLAB_HWCACHE_ALIGN,
2965                                          NULL,
2966                                          NULL);
2967         if (!ib_mad_cache) {
2968                 printk(KERN_ERR PFX "Couldn't create ib_mad cache\n");
2969                 ret = -ENOMEM;
2970                 goto error1;
2971         }
2972
2973         INIT_LIST_HEAD(&ib_mad_port_list);
2974
2975         if (ib_register_client(&mad_client)) {
2976                 printk(KERN_ERR PFX "Couldn't register ib_mad client\n");
2977                 ret = -EINVAL;
2978                 goto error2;
2979         }
2980
2981         return 0;
2982
2983 error2:
2984         kmem_cache_destroy(ib_mad_cache);
2985 error1:
2986         return ret;
2987 }
2988
2989 static void __exit ib_mad_cleanup_module(void)
2990 {
2991         ib_unregister_client(&mad_client);
2992         kmem_cache_destroy(ib_mad_cache);
2993 }
2994
2995 module_init(ib_mad_init_module);
2996 module_exit(ib_mad_cleanup_module);
2997