drivers/infiniband/core/mad.c

   1 /*
   2  * Copyright (c) 2004-2007 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  */
  35 #include <linux/dma-mapping.h>
  36 #include <rdma/ib_cache.h>
  37
  38 #include "mad_priv.h"
  39 #include "mad_rmpp.h"
  40 #include "smi.h"
  41 #include "agent.h"
  42
  43 MODULE_LICENSE("Dual BSD/GPL");
  44 MODULE_DESCRIPTION("kernel IB MAD API");
  45 MODULE_AUTHOR("Hal Rosenstock");
  46 MODULE_AUTHOR("Sean Hefty");
  47
  48 static struct kmem_cache *ib_mad_cache;
  49
  50 static struct list_head ib_mad_port_list;
  51 static u32 ib_mad_client_id = 0;
  52
  53 /* Port list lock */
  54 static spinlock_t ib_mad_port_list_lock;
  55
  56
  57 /* Forward declarations */
  58 static int method_in_use(struct ib_mad_mgmt_method_table **method,
  59                          struct ib_mad_reg_req *mad_reg_req);
  60 static void remove_mad_reg_req(struct ib_mad_agent_private *priv);
  61 static struct ib_mad_agent_private *find_mad_agent(
  62                                         struct ib_mad_port_private *port_priv,
  63                                         struct ib_mad *mad);
  64 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
  65                                     struct ib_mad_private *mad);
  66 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv);
  67 static void timeout_sends(struct work_struct *work);
  68 static void local_completions(struct work_struct *work);
  69 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
  70                               struct ib_mad_agent_private *agent_priv,
  71                               u8 mgmt_class);
  72 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
  73                            struct ib_mad_agent_private *agent_priv);
  74
  75 /*
  76  * Returns a ib_mad_port_private structure or NULL for a device/port
  77  * Assumes ib_mad_port_list_lock is being held
  78  */
  79 static inline struct ib_mad_port_private *
  80 __ib_get_mad_port(struct ib_device *device, int port_num)
  81 {
  82         struct ib_mad_port_private *entry;
  83
  84         list_for_each_entry(entry, &ib_mad_port_list, port_list) {
  85                 if (entry->device == device && entry->port_num == port_num)
  86                         return entry;
  87         }
  88         return NULL;
  89 }
  90
  91 /*
  92  * Wrapper function to return a ib_mad_port_private structure or NULL
  93  * for a device/port
  94  */
  95 static inline struct ib_mad_port_private *
  96 ib_get_mad_port(struct ib_device *device, int port_num)
  97 {
  98         struct ib_mad_port_private *entry;
  99         unsigned long flags;
 100
 101         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
 102         entry = __ib_get_mad_port(device, port_num);
 103         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
 104
 105         return entry;
 106 }
 107
 108 static inline u8 convert_mgmt_class(u8 mgmt_class)
 109 {
 110         /* Alias IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE to 0 */
 111         return mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE ?
 112                 0 : mgmt_class;
 113 }
 114
 115 static int get_spl_qp_index(enum ib_qp_type qp_type)
 116 {
 117         switch (qp_type)
 118         {
 119         case IB_QPT_SMI:
 120                 return 0;
 121         case IB_QPT_GSI:
 122                 return 1;
 123         default:
 124                 return -1;
 125         }
 126 }
 127
 128 static int vendor_class_index(u8 mgmt_class)
 129 {
 130         return mgmt_class - IB_MGMT_CLASS_VENDOR_RANGE2_START;
 131 }
 132
 133 static int is_vendor_class(u8 mgmt_class)
 134 {
 135         if ((mgmt_class < IB_MGMT_CLASS_VENDOR_RANGE2_START) ||
 136             (mgmt_class > IB_MGMT_CLASS_VENDOR_RANGE2_END))
 137                 return 0;
 138         return 1;
 139 }
 140
 141 static int is_vendor_oui(char *oui)
 142 {
 143         if (oui[0] || oui[1] || oui[2])
 144                 return 1;
 145         return 0;
 146 }
 147
 148 static int is_vendor_method_in_use(
 149                 struct ib_mad_mgmt_vendor_class *vendor_class,
 150                 struct ib_mad_reg_req *mad_reg_req)
 151 {
 152         struct ib_mad_mgmt_method_table *method;
 153         int i;
 154
 155         for (i = 0; i < MAX_MGMT_OUI; i++) {
 156                 if (!memcmp(vendor_class->oui[i], mad_reg_req->oui, 3)) {
 157                         method = vendor_class->method_table[i];
 158                         if (method) {
 159                                 if (method_in_use(&method, mad_reg_req))
 160                                         return 1;
 161                                 else
 162                                         break;
 163                         }
 164                 }
 165         }
 166         return 0;
 167 }
 168
 169 int ib_response_mad(struct ib_mad *mad)
 170 {
 171         return ((mad->mad_hdr.method & IB_MGMT_METHOD_RESP) ||
 172                 (mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS) ||
 173                 ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_BM) &&
 174                  (mad->mad_hdr.attr_mod & IB_BM_ATTR_MOD_RESP)));
 175 }
 176 EXPORT_SYMBOL(ib_response_mad);
 177
 178 /*
 179  * ib_register_mad_agent - Register to send/receive MADs
 180  */
 181 struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
 182                                            u8 port_num,
 183                                            enum ib_qp_type qp_type,
 184                                            struct ib_mad_reg_req *mad_reg_req,
 185                                            u8 rmpp_version,
 186                                            ib_mad_send_handler send_handler,
 187                                            ib_mad_recv_handler recv_handler,
 188                                            void *context)
 189 {
 190         struct ib_mad_port_private *port_priv;
 191         struct ib_mad_agent *ret = ERR_PTR(-EINVAL);
 192         struct ib_mad_agent_private *mad_agent_priv;
 193         struct ib_mad_reg_req *reg_req = NULL;
 194         struct ib_mad_mgmt_class_table *class;
 195         struct ib_mad_mgmt_vendor_class_table *vendor;
 196         struct ib_mad_mgmt_vendor_class *vendor_class;
 197         struct ib_mad_mgmt_method_table *method;
 198         int ret2, qpn;
 199         unsigned long flags;
 200         u8 mgmt_class, vclass;
 201
 202         /* Validate parameters */
 203         qpn = get_spl_qp_index(qp_type);
 204         if (qpn == -1)
 205                 goto error1;
 206
 207         if (rmpp_version && rmpp_version != IB_MGMT_RMPP_VERSION)
 208                 goto error1;
 209
 210         /* Validate MAD registration request if supplied */
 211         if (mad_reg_req) {
 212                 if (mad_reg_req->mgmt_class_version >= MAX_MGMT_VERSION)
 213                         goto error1;
 214                 if (!recv_handler)
 215                         goto error1;
 216                 if (mad_reg_req->mgmt_class >= MAX_MGMT_CLASS) {
 217                         /*
 218                          * IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE is the only
 219                          * one in this range currently allowed
 220                          */
 221                         if (mad_reg_req->mgmt_class !=
 222                             IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
 223                                 goto error1;
 224                 } else if (mad_reg_req->mgmt_class == 0) {
 225                         /*
 226                          * Class 0 is reserved in IBA and is used for
 227                          * aliasing of IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE
 228                          */
 229                         goto error1;
 230                 } else if (is_vendor_class(mad_reg_req->mgmt_class)) {
 231                         /*
 232                          * If class is in "new" vendor range,
 233                          * ensure supplied OUI is not zero
 234                          */
 235                         if (!is_vendor_oui(mad_reg_req->oui))
 236                                 goto error1;
 237                 }
 238                 /* Make sure class supplied is consistent with RMPP */
 239                 if (!ib_is_mad_class_rmpp(mad_reg_req->mgmt_class)) {
 240                         if (rmpp_version)
 241                                 goto error1;
 242                 }
 243                 /* Make sure class supplied is consistent with QP type */
 244                 if (qp_type == IB_QPT_SMI) {
 245                         if ((mad_reg_req->mgmt_class !=
 246                                         IB_MGMT_CLASS_SUBN_LID_ROUTED) &&
 247                             (mad_reg_req->mgmt_class !=
 248                                         IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
 249                                 goto error1;
 250                 } else {
 251                         if ((mad_reg_req->mgmt_class ==
 252                                         IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
 253                             (mad_reg_req->mgmt_class ==
 254                                         IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
 255                                 goto error1;
 256                 }
 257         } else {
 258                 /* No registration request supplied */
 259                 if (!send_handler)
 260                         goto error1;
 261         }
 262
 263         /* Validate device and port */
 264         port_priv = ib_get_mad_port(device, port_num);
 265         if (!port_priv) {
 266                 ret = ERR_PTR(-ENODEV);
 267                 goto error1;
 268         }
 269
 270         /* Allocate structures */
 271         mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL);
 272         if (!mad_agent_priv) {
 273                 ret = ERR_PTR(-ENOMEM);
 274                 goto error1;
 275         }
 276
 277         mad_agent_priv->agent.mr = ib_get_dma_mr(port_priv->qp_info[qpn].qp->pd,
 278                                                  IB_ACCESS_LOCAL_WRITE);
 279         if (IS_ERR(mad_agent_priv->agent.mr)) {
 280                 ret = ERR_PTR(-ENOMEM);
 281                 goto error2;
 282         }
 283
 284         if (mad_reg_req) {
 285                 reg_req = kmalloc(sizeof *reg_req, GFP_KERNEL);
 286                 if (!reg_req) {
 287                         ret = ERR_PTR(-ENOMEM);
 288                         goto error3;
 289                 }
 290                 /* Make a copy of the MAD registration request */
 291                 memcpy(reg_req, mad_reg_req, sizeof *reg_req);
 292         }
 293
 294         /* Now, fill in the various structures */
 295         mad_agent_priv->qp_info = &port_priv->qp_info[qpn];
 296         mad_agent_priv->reg_req = reg_req;
 297         mad_agent_priv->agent.rmpp_version = rmpp_version;
 298         mad_agent_priv->agent.device = device;
 299         mad_agent_priv->agent.recv_handler = recv_handler;
 300         mad_agent_priv->agent.send_handler = send_handler;
 301         mad_agent_priv->agent.context = context;
 302         mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp;
 303         mad_agent_priv->agent.port_num = port_num;
 304         spin_lock_init(&mad_agent_priv->lock);
 305         INIT_LIST_HEAD(&mad_agent_priv->send_list);
 306         INIT_LIST_HEAD(&mad_agent_priv->wait_list);
 307         INIT_LIST_HEAD(&mad_agent_priv->done_list);
 308         INIT_LIST_HEAD(&mad_agent_priv->rmpp_list);
 309         INIT_DELAYED_WORK(&mad_agent_priv->timed_work, timeout_sends);
 310         INIT_LIST_HEAD(&mad_agent_priv->local_list);
 311         INIT_WORK(&mad_agent_priv->local_work, local_completions);
 312         atomic_set(&mad_agent_priv->refcount, 1);
 313         init_completion(&mad_agent_priv->comp);
 314
 315         spin_lock_irqsave(&port_priv->reg_lock, flags);
 316         mad_agent_priv->agent.hi_tid = ++ib_mad_client_id;
 317
 318         /*
 319          * Make sure MAD registration (if supplied)
 320          * is non overlapping with any existing ones
 321          */
 322         if (mad_reg_req) {
 323                 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class);
 324                 if (!is_vendor_class(mgmt_class)) {
 325                         class = port_priv->version[mad_reg_req->
 326                                                    mgmt_class_version].class;
 327                         if (class) {
 328                                 method = class->method_table[mgmt_class];
 329                                 if (method) {
 330                                         if (method_in_use(&method,
 331                                                            mad_reg_req))
 332                                                 goto error4;
 333                                 }
 334                         }
 335                         ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv,
 336                                                   mgmt_class);
 337                 } else {
 338                         /* "New" vendor class range */
 339                         vendor = port_priv->version[mad_reg_req->
 340                                                     mgmt_class_version].vendor;
 341                         if (vendor) {
 342                                 vclass = vendor_class_index(mgmt_class);
 343                                 vendor_class = vendor->vendor_class[vclass];
 344                                 if (vendor_class) {
 345                                         if (is_vendor_method_in_use(
 346                                                         vendor_class,
 347                                                         mad_reg_req))
 348                                                 goto error4;
 349                                 }
 350                         }
 351                         ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv);
 352                 }
 353                 if (ret2) {
 354                         ret = ERR_PTR(ret2);
 355                         goto error4;
 356                 }
 357         }
 358
 359         /* Add mad agent into port's agent list */
 360         list_add_tail(&mad_agent_priv->agent_list, &port_priv->agent_list);
 361         spin_unlock_irqrestore(&port_priv->reg_lock, flags);
 362
 363         return &mad_agent_priv->agent;
 364
 365 error4:
 366         spin_unlock_irqrestore(&port_priv->reg_lock, flags);
 367         kfree(reg_req);
 368 error3:
 369         ib_dereg_mr(mad_agent_priv->agent.mr);
 370 error2:
 371         kfree(mad_agent_priv);
 372 error1:
 373         return ret;
 374 }
 375 EXPORT_SYMBOL(ib_register_mad_agent);
 376
 377 static inline int is_snooping_sends(int mad_snoop_flags)
 378 {
 379         return (mad_snoop_flags &
 380                 (/*IB_MAD_SNOOP_POSTED_SENDS |
 381                  IB_MAD_SNOOP_RMPP_SENDS |*/
 382                  IB_MAD_SNOOP_SEND_COMPLETIONS /*|
 383                  IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS*/));
 384 }
 385
 386 static inline int is_snooping_recvs(int mad_snoop_flags)
 387 {
 388         return (mad_snoop_flags &
 389                 (IB_MAD_SNOOP_RECVS /*|
 390                  IB_MAD_SNOOP_RMPP_RECVS*/));
 391 }
 392
 393 static int register_snoop_agent(struct ib_mad_qp_info *qp_info,
 394                                 struct ib_mad_snoop_private *mad_snoop_priv)
 395 {
 396         struct ib_mad_snoop_private **new_snoop_table;
 397         unsigned long flags;
 398         int i;
 399
 400         spin_lock_irqsave(&qp_info->snoop_lock, flags);
 401         /* Check for empty slot in array. */
 402         for (i = 0; i < qp_info->snoop_table_size; i++)
 403                 if (!qp_info->snoop_table[i])
 404                         break;
 405
 406         if (i == qp_info->snoop_table_size) {
 407                 /* Grow table. */
 408                 new_snoop_table = krealloc(qp_info->snoop_table,
 409                                            sizeof mad_snoop_priv *
 410                                            (qp_info->snoop_table_size + 1),
 411                                            GFP_ATOMIC);
 412                 if (!new_snoop_table) {
 413                         i = -ENOMEM;
 414                         goto out;
 415                 }
 416
 417                 qp_info->snoop_table = new_snoop_table;
 418                 qp_info->snoop_table_size++;
 419         }
 420         qp_info->snoop_table[i] = mad_snoop_priv;
 421         atomic_inc(&qp_info->snoop_count);
 422 out:
 423         spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 424         return i;
 425 }
 426
 427 struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device,
 428                                            u8 port_num,
 429                                            enum ib_qp_type qp_type,
 430                                            int mad_snoop_flags,
 431                                            ib_mad_snoop_handler snoop_handler,
 432                                            ib_mad_recv_handler recv_handler,
 433                                            void *context)
 434 {
 435         struct ib_mad_port_private *port_priv;
 436         struct ib_mad_agent *ret;
 437         struct ib_mad_snoop_private *mad_snoop_priv;
 438         int qpn;
 439
 440         /* Validate parameters */
 441         if ((is_snooping_sends(mad_snoop_flags) && !snoop_handler) ||
 442             (is_snooping_recvs(mad_snoop_flags) && !recv_handler)) {
 443                 ret = ERR_PTR(-EINVAL);
 444                 goto error1;
 445         }
 446         qpn = get_spl_qp_index(qp_type);
 447         if (qpn == -1) {
 448                 ret = ERR_PTR(-EINVAL);
 449                 goto error1;
 450         }
 451         port_priv = ib_get_mad_port(device, port_num);
 452         if (!port_priv) {
 453                 ret = ERR_PTR(-ENODEV);
 454                 goto error1;
 455         }
 456         /* Allocate structures */
 457         mad_snoop_priv = kzalloc(sizeof *mad_snoop_priv, GFP_KERNEL);
 458         if (!mad_snoop_priv) {
 459                 ret = ERR_PTR(-ENOMEM);
 460                 goto error1;
 461         }
 462
 463         /* Now, fill in the various structures */
 464         mad_snoop_priv->qp_info = &port_priv->qp_info[qpn];
 465         mad_snoop_priv->agent.device = device;
 466         mad_snoop_priv->agent.recv_handler = recv_handler;
 467         mad_snoop_priv->agent.snoop_handler = snoop_handler;
 468         mad_snoop_priv->agent.context = context;
 469         mad_snoop_priv->agent.qp = port_priv->qp_info[qpn].qp;
 470         mad_snoop_priv->agent.port_num = port_num;
 471         mad_snoop_priv->mad_snoop_flags = mad_snoop_flags;
 472         init_completion(&mad_snoop_priv->comp);
 473         mad_snoop_priv->snoop_index = register_snoop_agent(
 474                                                 &port_priv->qp_info[qpn],
 475                                                 mad_snoop_priv);
 476         if (mad_snoop_priv->snoop_index < 0) {
 477                 ret = ERR_PTR(mad_snoop_priv->snoop_index);
 478                 goto error2;
 479         }
 480
 481         atomic_set(&mad_snoop_priv->refcount, 1);
 482         return &mad_snoop_priv->agent;
 483
 484 error2:
 485         kfree(mad_snoop_priv);
 486 error1:
 487         return ret;
 488 }
 489 EXPORT_SYMBOL(ib_register_mad_snoop);
 490
 491 static inline void deref_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
 492 {
 493         if (atomic_dec_and_test(&mad_agent_priv->refcount))
 494                 complete(&mad_agent_priv->comp);
 495 }
 496
 497 static inline void deref_snoop_agent(struct ib_mad_snoop_private *mad_snoop_priv)
 498 {
 499         if (atomic_dec_and_test(&mad_snoop_priv->refcount))
 500                 complete(&mad_snoop_priv->comp);
 501 }
 502
 503 static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
 504 {
 505         struct ib_mad_port_private *port_priv;
 506         unsigned long flags;
 507
 508         /* Note that we could still be handling received MADs */
 509
 510         /*
 511          * Canceling all sends results in dropping received response
 512          * MADs, preventing us from queuing additional work
 513          */
 514         cancel_mads(mad_agent_priv);
 515         port_priv = mad_agent_priv->qp_info->port_priv;
 516         cancel_delayed_work(&mad_agent_priv->timed_work);
 517
 518         spin_lock_irqsave(&port_priv->reg_lock, flags);
 519         remove_mad_reg_req(mad_agent_priv);
 520         list_del(&mad_agent_priv->agent_list);
 521         spin_unlock_irqrestore(&port_priv->reg_lock, flags);
 522
 523         flush_workqueue(port_priv->wq);
 524         ib_cancel_rmpp_recvs(mad_agent_priv);
 525
 526         deref_mad_agent(mad_agent_priv);
 527         wait_for_completion(&mad_agent_priv->comp);
 528
 529         kfree(mad_agent_priv->reg_req);
 530         ib_dereg_mr(mad_agent_priv->agent.mr);
 531         kfree(mad_agent_priv);
 532 }
 533
 534 static void unregister_mad_snoop(struct ib_mad_snoop_private *mad_snoop_priv)
 535 {
 536         struct ib_mad_qp_info *qp_info;
 537         unsigned long flags;
 538
 539         qp_info = mad_snoop_priv->qp_info;
 540         spin_lock_irqsave(&qp_info->snoop_lock, flags);
 541         qp_info->snoop_table[mad_snoop_priv->snoop_index] = NULL;
 542         atomic_dec(&qp_info->snoop_count);
 543         spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 544
 545         deref_snoop_agent(mad_snoop_priv);
 546         wait_for_completion(&mad_snoop_priv->comp);
 547
 548         kfree(mad_snoop_priv);
 549 }
 550
 551 /*
 552  * ib_unregister_mad_agent - Unregisters a client from using MAD services
 553  */
 554 int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent)
 555 {
 556         struct ib_mad_agent_private *mad_agent_priv;
 557         struct ib_mad_snoop_private *mad_snoop_priv;
 558
 559         /* If the TID is zero, the agent can only snoop. */
 560         if (mad_agent->hi_tid) {
 561                 mad_agent_priv = container_of(mad_agent,
 562                                               struct ib_mad_agent_private,
 563                                               agent);
 564                 unregister_mad_agent(mad_agent_priv);
 565         } else {
 566                 mad_snoop_priv = container_of(mad_agent,
 567                                               struct ib_mad_snoop_private,
 568                                               agent);
 569                 unregister_mad_snoop(mad_snoop_priv);
 570         }
 571         return 0;
 572 }
 573 EXPORT_SYMBOL(ib_unregister_mad_agent);
 574
 575 static void dequeue_mad(struct ib_mad_list_head *mad_list)
 576 {
 577         struct ib_mad_queue *mad_queue;
 578         unsigned long flags;
 579
 580         BUG_ON(!mad_list->mad_queue);
 581         mad_queue = mad_list->mad_queue;
 582         spin_lock_irqsave(&mad_queue->lock, flags);
 583         list_del(&mad_list->list);
 584         mad_queue->count--;
 585         spin_unlock_irqrestore(&mad_queue->lock, flags);
 586 }
 587
 588 static void snoop_send(struct ib_mad_qp_info *qp_info,
 589                        struct ib_mad_send_buf *send_buf,
 590                        struct ib_mad_send_wc *mad_send_wc,
 591                        int mad_snoop_flags)
 592 {
 593         struct ib_mad_snoop_private *mad_snoop_priv;
 594         unsigned long flags;
 595         int i;
 596
 597         spin_lock_irqsave(&qp_info->snoop_lock, flags);
 598         for (i = 0; i < qp_info->snoop_table_size; i++) {
 599                 mad_snoop_priv = qp_info->snoop_table[i];
 600                 if (!mad_snoop_priv ||
 601                     !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
 602                         continue;
 603
 604                 atomic_inc(&mad_snoop_priv->refcount);
 605                 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 606                 mad_snoop_priv->agent.snoop_handler(&mad_snoop_priv->agent,
 607                                                     send_buf, mad_send_wc);
 608                 deref_snoop_agent(mad_snoop_priv);
 609                 spin_lock_irqsave(&qp_info->snoop_lock, flags);
 610         }
 611         spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 612 }
 613
 614 static void snoop_recv(struct ib_mad_qp_info *qp_info,
 615                        struct ib_mad_recv_wc *mad_recv_wc,
 616                        int mad_snoop_flags)
 617 {
 618         struct ib_mad_snoop_private *mad_snoop_priv;
 619         unsigned long flags;
 620         int i;
 621
 622         spin_lock_irqsave(&qp_info->snoop_lock, flags);
 623         for (i = 0; i < qp_info->snoop_table_size; i++) {
 624                 mad_snoop_priv = qp_info->snoop_table[i];
 625                 if (!mad_snoop_priv ||
 626                     !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
 627                         continue;
 628
 629                 atomic_inc(&mad_snoop_priv->refcount);
 630                 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 631                 mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent,
 632                                                    mad_recv_wc);
 633                 deref_snoop_agent(mad_snoop_priv);
 634                 spin_lock_irqsave(&qp_info->snoop_lock, flags);
 635         }
 636         spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 637 }
 638
 639 static void build_smp_wc(struct ib_qp *qp,
 640                          u64 wr_id, u16 slid, u16 pkey_index, u8 port_num,
 641                          struct ib_wc *wc)
 642 {
 643         memset(wc, 0, sizeof *wc);
 644         wc->wr_id = wr_id;
 645         wc->status = IB_WC_SUCCESS;
 646         wc->opcode = IB_WC_RECV;
 647         wc->pkey_index = pkey_index;
 648         wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh);
 649         wc->src_qp = IB_QP0;
 650         wc->qp = qp;
 651         wc->slid = slid;
 652         wc->sl = 0;
 653         wc->dlid_path_bits = 0;
 654         wc->port_num = port_num;
 655 }
 656
 657 /*
 658  * Return 0 if SMP is to be sent
 659  * Return 1 if SMP was consumed locally (whether or not solicited)
 660  * Return < 0 if error
 661  */
 662 static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv,
 663                                   struct ib_mad_send_wr_private *mad_send_wr)
 664 {
 665         int ret = 0;
 666         struct ib_smp *smp = mad_send_wr->send_buf.mad;
 667         unsigned long flags;
 668         struct ib_mad_local_private *local;
 669         struct ib_mad_private *mad_priv;
 670         struct ib_mad_port_private *port_priv;
 671         struct ib_mad_agent_private *recv_mad_agent = NULL;
 672         struct ib_device *device = mad_agent_priv->agent.device;
 673         u8 port_num;
 674         struct ib_wc mad_wc;
 675         struct ib_send_wr *send_wr = &mad_send_wr->send_wr;
 676
 677         if (device->node_type == RDMA_NODE_IB_SWITCH &&
 678             smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
 679                 port_num = send_wr->wr.ud.port_num;
 680         else
 681                 port_num = mad_agent_priv->agent.port_num;
 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              IB_SMI_DISCARD) {
 693                 ret = -EINVAL;
 694                 printk(KERN_ERR PFX "Invalid directed route\n");
 695                 goto out;
 696         }
 697
 698         /* Check to post send on QP or process locally */
 699         if (smi_check_local_smp(smp, device) == IB_SMI_DISCARD &&
 700             smi_check_local_returning_smp(smp, device) == IB_SMI_DISCARD)
 701                 goto out;
 702
 703         local = kmalloc(sizeof *local, GFP_ATOMIC);
 704         if (!local) {
 705                 ret = -ENOMEM;
 706                 printk(KERN_ERR PFX "No memory for ib_mad_local_private\n");
 707                 goto out;
 708         }
 709         local->mad_priv = NULL;
 710         local->recv_mad_agent = NULL;
 711         mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_ATOMIC);
 712         if (!mad_priv) {
 713                 ret = -ENOMEM;
 714                 printk(KERN_ERR PFX "No memory for local response MAD\n");
 715                 kfree(local);
 716                 goto out;
 717         }
 718
 719         build_smp_wc(mad_agent_priv->agent.qp,
 720                      send_wr->wr_id, be16_to_cpu(smp->dr_slid),
 721                      send_wr->wr.ud.pkey_index,
 722                      send_wr->wr.ud.port_num, &mad_wc);
 723
 724         /* No GRH for DR SMP */
 725         ret = device->process_mad(device, 0, port_num, &mad_wc, NULL,
 726                                   (struct ib_mad *)smp,
 727                                   (struct ib_mad *)&mad_priv->mad);
 728         switch (ret)
 729         {
 730         case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
 731                 if (ib_response_mad(&mad_priv->mad.mad) &&
 732                     mad_agent_priv->agent.recv_handler) {
 733                         local->mad_priv = mad_priv;
 734                         local->recv_mad_agent = mad_agent_priv;
 735                         /*
 736                          * Reference MAD agent until receive
 737                          * side of local completion handled
 738                          */
 739                         atomic_inc(&mad_agent_priv->refcount);
 740                 } else
 741                         kmem_cache_free(ib_mad_cache, mad_priv);
 742                 break;
 743         case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
 744                 kmem_cache_free(ib_mad_cache, mad_priv);
 745                 break;
 746         case IB_MAD_RESULT_SUCCESS:
 747                 /* Treat like an incoming receive MAD */
 748                 port_priv = ib_get_mad_port(mad_agent_priv->agent.device,
 749                                             mad_agent_priv->agent.port_num);
 750                 if (port_priv) {
 751                         memcpy(&mad_priv->mad.mad, smp, sizeof(struct ib_mad));
 752                         recv_mad_agent = find_mad_agent(port_priv,
 753                                                         &mad_priv->mad.mad);
 754                 }
 755                 if (!port_priv || !recv_mad_agent) {
 756                         /*
 757                          * No receiving agent so drop packet and
 758                          * generate send completion.
 759                          */
 760                         kmem_cache_free(ib_mad_cache, mad_priv);
 761                         break;
 762                 }
 763                 local->mad_priv = mad_priv;
 764                 local->recv_mad_agent = recv_mad_agent;
 765                 break;
 766         default:
 767                 kmem_cache_free(ib_mad_cache, mad_priv);
 768                 kfree(local);
 769                 ret = -EINVAL;
 770                 goto out;
 771         }
 772
 773         local->mad_send_wr = mad_send_wr;
 774         /* Reference MAD agent until send side of local completion handled */
 775         atomic_inc(&mad_agent_priv->refcount);
 776         /* Queue local completion to local list */
 777         spin_lock_irqsave(&mad_agent_priv->lock, flags);
 778         list_add_tail(&local->completion_list, &mad_agent_priv->local_list);
 779         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
 780         queue_work(mad_agent_priv->qp_info->port_priv->wq,
 781                    &mad_agent_priv->local_work);
 782         ret = 1;
 783 out:
 784         return ret;
 785 }
 786
 787 static int get_pad_size(int hdr_len, int data_len)
 788 {
 789         int seg_size, pad;
 790
 791         seg_size = sizeof(struct ib_mad) - hdr_len;
 792         if (data_len && seg_size) {
 793                 pad = seg_size - data_len % seg_size;
 794                 return pad == seg_size ? 0 : pad;
 795         } else
 796                 return seg_size;
 797 }
 798
 799 static void free_send_rmpp_list(struct ib_mad_send_wr_private *mad_send_wr)
 800 {
 801         struct ib_rmpp_segment *s, *t;
 802
 803         list_for_each_entry_safe(s, t, &mad_send_wr->rmpp_list, list) {
 804                 list_del(&s->list);
 805                 kfree(s);
 806         }
 807 }
 808
 809 static int alloc_send_rmpp_list(struct ib_mad_send_wr_private *send_wr,
 810                                 gfp_t gfp_mask)
 811 {
 812         struct ib_mad_send_buf *send_buf = &send_wr->send_buf;
 813         struct ib_rmpp_mad *rmpp_mad = send_buf->mad;
 814         struct ib_rmpp_segment *seg = NULL;
 815         int left, seg_size, pad;
 816
 817         send_buf->seg_size = sizeof (struct ib_mad) - send_buf->hdr_len;
 818         seg_size = send_buf->seg_size;
 819         pad = send_wr->pad;
 820
 821         /* Allocate data segments. */
 822         for (left = send_buf->data_len + pad; left > 0; left -= seg_size) {
 823                 seg = kmalloc(sizeof (*seg) + seg_size, gfp_mask);
 824                 if (!seg) {
 825                         printk(KERN_ERR "alloc_send_rmpp_segs: RMPP mem "
 826                                "alloc failed for len %zd, gfp %#x\n",
 827                                sizeof (*seg) + seg_size, gfp_mask);
 828                         free_send_rmpp_list(send_wr);
 829                         return -ENOMEM;
 830                 }
 831                 seg->num = ++send_buf->seg_count;
 832                 list_add_tail(&seg->list, &send_wr->rmpp_list);
 833         }
 834
 835         /* Zero any padding */
 836         if (pad)
 837                 memset(seg->data + seg_size - pad, 0, pad);
 838
 839         rmpp_mad->rmpp_hdr.rmpp_version = send_wr->mad_agent_priv->
 840                                           agent.rmpp_version;
 841         rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA;
 842         ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
 843
 844         send_wr->cur_seg = container_of(send_wr->rmpp_list.next,
 845                                         struct ib_rmpp_segment, list);
 846         send_wr->last_ack_seg = send_wr->cur_seg;
 847         return 0;
 848 }
 849
 850 struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
 851                                             u32 remote_qpn, u16 pkey_index,
 852                                             int rmpp_active,
 853                                             int hdr_len, int data_len,
 854                                             gfp_t gfp_mask)
 855 {
 856         struct ib_mad_agent_private *mad_agent_priv;
 857         struct ib_mad_send_wr_private *mad_send_wr;
 858         int pad, message_size, ret, size;
 859         void *buf;
 860
 861         mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
 862                                       agent);
 863         pad = get_pad_size(hdr_len, data_len);
 864         message_size = hdr_len + data_len + pad;
 865
 866         if ((!mad_agent->rmpp_version &&
 867              (rmpp_active || message_size > sizeof(struct ib_mad))) ||
 868             (!rmpp_active && message_size > sizeof(struct ib_mad)))
 869                 return ERR_PTR(-EINVAL);
 870
 871         size = rmpp_active ? hdr_len : sizeof(struct ib_mad);
 872         buf = kzalloc(sizeof *mad_send_wr + size, gfp_mask);
 873         if (!buf)
 874                 return ERR_PTR(-ENOMEM);
 875
 876         mad_send_wr = buf + size;
 877         INIT_LIST_HEAD(&mad_send_wr->rmpp_list);
 878         mad_send_wr->send_buf.mad = buf;
 879         mad_send_wr->send_buf.hdr_len = hdr_len;
 880         mad_send_wr->send_buf.data_len = data_len;
 881         mad_send_wr->pad = pad;
 882
 883         mad_send_wr->mad_agent_priv = mad_agent_priv;
 884         mad_send_wr->sg_list[0].length = hdr_len;
 885         mad_send_wr->sg_list[0].lkey = mad_agent->mr->lkey;
 886         mad_send_wr->sg_list[1].length = sizeof(struct ib_mad) - hdr_len;
 887         mad_send_wr->sg_list[1].lkey = mad_agent->mr->lkey;
 888
 889         mad_send_wr->send_wr.wr_id = (unsigned long) mad_send_wr;
 890         mad_send_wr->send_wr.sg_list = mad_send_wr->sg_list;
 891         mad_send_wr->send_wr.num_sge = 2;
 892         mad_send_wr->send_wr.opcode = IB_WR_SEND;
 893         mad_send_wr->send_wr.send_flags = IB_SEND_SIGNALED;
 894         mad_send_wr->send_wr.wr.ud.remote_qpn = remote_qpn;
 895         mad_send_wr->send_wr.wr.ud.remote_qkey = IB_QP_SET_QKEY;
 896         mad_send_wr->send_wr.wr.ud.pkey_index = pkey_index;
 897
 898         if (rmpp_active) {
 899                 ret = alloc_send_rmpp_list(mad_send_wr, gfp_mask);
 900                 if (ret) {
 901                         kfree(buf);
 902                         return ERR_PTR(ret);
 903                 }
 904         }
 905
 906         mad_send_wr->send_buf.mad_agent = mad_agent;
 907         atomic_inc(&mad_agent_priv->refcount);
 908         return &mad_send_wr->send_buf;
 909 }
 910 EXPORT_SYMBOL(ib_create_send_mad);
 911
 912 int ib_get_mad_data_offset(u8 mgmt_class)
 913 {
 914         if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM)
 915                 return IB_MGMT_SA_HDR;
 916         else if ((mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
 917                  (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
 918                  (mgmt_class == IB_MGMT_CLASS_BIS))
 919                 return IB_MGMT_DEVICE_HDR;
 920         else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
 921                  (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))
 922                 return IB_MGMT_VENDOR_HDR;
 923         else
 924                 return IB_MGMT_MAD_HDR;
 925 }
 926 EXPORT_SYMBOL(ib_get_mad_data_offset);
 927
 928 int ib_is_mad_class_rmpp(u8 mgmt_class)
 929 {
 930         if ((mgmt_class == IB_MGMT_CLASS_SUBN_ADM) ||
 931             (mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
 932             (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
 933             (mgmt_class == IB_MGMT_CLASS_BIS) ||
 934             ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
 935              (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)))
 936                 return 1;
 937         return 0;
 938 }
 939 EXPORT_SYMBOL(ib_is_mad_class_rmpp);
 940
 941 void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num)
 942 {
 943         struct ib_mad_send_wr_private *mad_send_wr;
 944         struct list_head *list;
 945
 946         mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
 947                                    send_buf);
 948         list = &mad_send_wr->cur_seg->list;
 949
 950         if (mad_send_wr->cur_seg->num < seg_num) {
 951                 list_for_each_entry(mad_send_wr->cur_seg, list, list)
 952                         if (mad_send_wr->cur_seg->num == seg_num)
 953                                 break;
 954         } else if (mad_send_wr->cur_seg->num > seg_num) {
 955                 list_for_each_entry_reverse(mad_send_wr->cur_seg, list, list)
 956                         if (mad_send_wr->cur_seg->num == seg_num)
 957                                 break;
 958         }
 959         return mad_send_wr->cur_seg->data;
 960 }
 961 EXPORT_SYMBOL(ib_get_rmpp_segment);
 962
 963 static inline void *ib_get_payload(struct ib_mad_send_wr_private *mad_send_wr)
 964 {
 965         if (mad_send_wr->send_buf.seg_count)
 966                 return ib_get_rmpp_segment(&mad_send_wr->send_buf,
 967                                            mad_send_wr->seg_num);
 968         else
 969                 return mad_send_wr->send_buf.mad +
 970                        mad_send_wr->send_buf.hdr_len;
 971 }
 972
 973 void ib_free_send_mad(struct ib_mad_send_buf *send_buf)
 974 {
 975         struct ib_mad_agent_private *mad_agent_priv;
 976         struct ib_mad_send_wr_private *mad_send_wr;
 977
 978         mad_agent_priv = container_of(send_buf->mad_agent,
 979                                       struct ib_mad_agent_private, agent);
 980         mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
 981                                    send_buf);
 982
 983         free_send_rmpp_list(mad_send_wr);
 984         kfree(send_buf->mad);
 985         deref_mad_agent(mad_agent_priv);
 986 }
 987 EXPORT_SYMBOL(ib_free_send_mad);
 988
 989 int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr)
 990 {
 991         struct ib_mad_qp_info *qp_info;
 992         struct list_head *list;
 993         struct ib_send_wr *bad_send_wr;
 994         struct ib_mad_agent *mad_agent;
 995         struct ib_sge *sge;
 996         unsigned long flags;
 997         int ret;
 998
 999         /* Set WR ID to find mad_send_wr upon completion */
1000         qp_info = mad_send_wr->mad_agent_priv->qp_info;
1001         mad_send_wr->send_wr.wr_id = (unsigned long)&mad_send_wr->mad_list;
1002         mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;
1003
1004         mad_agent = mad_send_wr->send_buf.mad_agent;
1005         sge = mad_send_wr->sg_list;
1006         sge[0].addr = ib_dma_map_single(mad_agent->device,
1007                                         mad_send_wr->send_buf.mad,
1008                                         sge[0].length,
1009                                         DMA_TO_DEVICE);
1010         mad_send_wr->header_mapping = sge[0].addr;
1011
1012         sge[1].addr = ib_dma_map_single(mad_agent->device,
1013                                         ib_get_payload(mad_send_wr),
1014                                         sge[1].length,
1015                                         DMA_TO_DEVICE);
1016         mad_send_wr->payload_mapping = sge[1].addr;
1017
1018         spin_lock_irqsave(&qp_info->send_queue.lock, flags);
1019         if (qp_info->send_queue.count < qp_info->send_queue.max_active) {
1020                 ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr,
1021                                    &bad_send_wr);
1022                 list = &qp_info->send_queue.list;
1023         } else {
1024                 ret = 0;
1025                 list = &qp_info->overflow_list;
1026         }
1027
1028         if (!ret) {
1029                 qp_info->send_queue.count++;
1030                 list_add_tail(&mad_send_wr->mad_list.list, list);
1031         }
1032         spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
1033         if (ret) {
1034                 ib_dma_unmap_single(mad_agent->device,
1035                                     mad_send_wr->header_mapping,
1036                                     sge[0].length, DMA_TO_DEVICE);
1037                 ib_dma_unmap_single(mad_agent->device,
1038                                     mad_send_wr->payload_mapping,
1039                                     sge[1].length, DMA_TO_DEVICE);
1040         }
1041         return ret;
1042 }
1043
1044 /*
1045  * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
1046  *  with the registered client
1047  */
1048 int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
1049                      struct ib_mad_send_buf **bad_send_buf)
1050 {
1051         struct ib_mad_agent_private *mad_agent_priv;
1052         struct ib_mad_send_buf *next_send_buf;
1053         struct ib_mad_send_wr_private *mad_send_wr;
1054         unsigned long flags;
1055         int ret = -EINVAL;
1056
1057         /* Walk list of send WRs and post each on send list */
1058         for (; send_buf; send_buf = next_send_buf) {
1059
1060                 mad_send_wr = container_of(send_buf,
1061                                            struct ib_mad_send_wr_private,
1062                                            send_buf);
1063                 mad_agent_priv = mad_send_wr->mad_agent_priv;
1064
1065                 if (!send_buf->mad_agent->send_handler ||
1066                     (send_buf->timeout_ms &&
1067                      !send_buf->mad_agent->recv_handler)) {
1068                         ret = -EINVAL;
1069                         goto error;
1070                 }
1071
1072                 if (!ib_is_mad_class_rmpp(((struct ib_mad_hdr *) send_buf->mad)->mgmt_class)) {
1073                         if (mad_agent_priv->agent.rmpp_version) {
1074                                 ret = -EINVAL;
1075                                 goto error;
1076                         }
1077                 }
1078
1079                 /*
1080                  * Save pointer to next work request to post in case the
1081                  * current one completes, and the user modifies the work
1082                  * request associated with the completion
1083                  */
1084                 next_send_buf = send_buf->next;
1085                 mad_send_wr->send_wr.wr.ud.ah = send_buf->ah;
1086
1087                 if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class ==
1088                     IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1089                         ret = handle_outgoing_dr_smp(mad_agent_priv,
1090                                                      mad_send_wr);
1091                         if (ret < 0)            /* error */
1092                                 goto error;
1093                         else if (ret == 1)      /* locally consumed */
1094                                 continue;
1095                 }
1096
1097                 mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid;
1098                 /* Timeout will be updated after send completes */
1099                 mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms);
1100                 mad_send_wr->max_retries = send_buf->retries;
1101                 mad_send_wr->retries_left = send_buf->retries;
1102                 send_buf->retries = 0;
1103                 /* Reference for work request to QP + response */
1104                 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0);
1105                 mad_send_wr->status = IB_WC_SUCCESS;
1106
1107                 /* Reference MAD agent until send completes */
1108                 atomic_inc(&mad_agent_priv->refcount);
1109                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1110                 list_add_tail(&mad_send_wr->agent_list,
1111                               &mad_agent_priv->send_list);
1112                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1113
1114                 if (mad_agent_priv->agent.rmpp_version) {
1115                         ret = ib_send_rmpp_mad(mad_send_wr);
1116                         if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED)
1117                                 ret = ib_send_mad(mad_send_wr);
1118                 } else
1119                         ret = ib_send_mad(mad_send_wr);
1120                 if (ret < 0) {
1121                         /* Fail send request */
1122                         spin_lock_irqsave(&mad_agent_priv->lock, flags);
1123                         list_del(&mad_send_wr->agent_list);
1124                         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1125                         atomic_dec(&mad_agent_priv->refcount);
1126                         goto error;
1127                 }
1128         }
1129         return 0;
1130 error:
1131         if (bad_send_buf)
1132                 *bad_send_buf = send_buf;
1133         return ret;
1134 }
1135 EXPORT_SYMBOL(ib_post_send_mad);
1136
1137 /*
1138  * ib_free_recv_mad - Returns data buffers used to receive
1139  *  a MAD to the access layer
1140  */
1141 void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc)
1142 {
1143         struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf;
1144         struct ib_mad_private_header *mad_priv_hdr;
1145         struct ib_mad_private *priv;
1146         struct list_head free_list;
1147
1148         INIT_LIST_HEAD(&free_list);
1149         list_splice_init(&mad_recv_wc->rmpp_list, &free_list);
1150
1151         list_for_each_entry_safe(mad_recv_buf, temp_recv_buf,
1152                                         &free_list, list) {
1153                 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc,
1154                                            recv_buf);
1155                 mad_priv_hdr = container_of(mad_recv_wc,
1156                                             struct ib_mad_private_header,
1157                                             recv_wc);
1158                 priv = container_of(mad_priv_hdr, struct ib_mad_private,
1159                                     header);
1160                 kmem_cache_free(ib_mad_cache, priv);
1161         }
1162 }
1163 EXPORT_SYMBOL(ib_free_recv_mad);
1164
1165 struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
1166                                         u8 rmpp_version,
1167                                         ib_mad_send_handler send_handler,
1168                                         ib_mad_recv_handler recv_handler,
1169                                         void *context)
1170 {
1171         return ERR_PTR(-EINVAL);        /* XXX: for now */
1172 }
1173 EXPORT_SYMBOL(ib_redirect_mad_qp);
1174
1175 int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
1176                       struct ib_wc *wc)
1177 {
1178         printk(KERN_ERR PFX "ib_process_mad_wc() not implemented yet\n");
1179         return 0;
1180 }
1181 EXPORT_SYMBOL(ib_process_mad_wc);
1182
1183 static int method_in_use(struct ib_mad_mgmt_method_table **method,
1184                          struct ib_mad_reg_req *mad_reg_req)
1185 {
1186         int i;
1187
1188         for (i = find_first_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS);
1189              i < IB_MGMT_MAX_METHODS;
1190              i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1191                                1+i)) {
1192                 if ((*method)->agent[i]) {
1193                         printk(KERN_ERR PFX "Method %d already in use\n", i);
1194                         return -EINVAL;
1195                 }
1196         }
1197         return 0;
1198 }
1199
1200 static int allocate_method_table(struct ib_mad_mgmt_method_table **method)
1201 {
1202         /* Allocate management method table */
1203         *method = kzalloc(sizeof **method, GFP_ATOMIC);
1204         if (!*method) {
1205                 printk(KERN_ERR PFX "No memory for "
1206                        "ib_mad_mgmt_method_table\n");
1207                 return -ENOMEM;
1208         }
1209
1210         return 0;
1211 }
1212
1213 /*
1214  * Check to see if there are any methods still in use
1215  */
1216 static int check_method_table(struct ib_mad_mgmt_method_table *method)
1217 {
1218         int i;
1219
1220         for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
1221                 if (method->agent[i])
1222                         return 1;
1223         return 0;
1224 }
1225
1226 /*
1227  * Check to see if there are any method tables for this class still in use
1228  */
1229 static int check_class_table(struct ib_mad_mgmt_class_table *class)
1230 {
1231         int i;
1232
1233         for (i = 0; i < MAX_MGMT_CLASS; i++)
1234                 if (class->method_table[i])
1235                         return 1;
1236         return 0;
1237 }
1238
1239 static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class)
1240 {
1241         int i;
1242
1243         for (i = 0; i < MAX_MGMT_OUI; i++)
1244                 if (vendor_class->method_table[i])
1245                         return 1;
1246         return 0;
1247 }
1248
1249 static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class,
1250                            char *oui)
1251 {
1252         int i;
1253
1254         for (i = 0; i < MAX_MGMT_OUI; i++)
1255                 /* Is there matching OUI for this vendor class ? */
1256                 if (!memcmp(vendor_class->oui[i], oui, 3))
1257                         return i;
1258
1259         return -1;
1260 }
1261
1262 static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor)
1263 {
1264         int i;
1265
1266         for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++)
1267                 if (vendor->vendor_class[i])
1268                         return 1;
1269
1270         return 0;
1271 }
1272
1273 static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method,
1274                                      struct ib_mad_agent_private *agent)
1275 {
1276         int i;
1277
1278         /* Remove any methods for this mad agent */
1279         for (i = 0; i < IB_MGMT_MAX_METHODS; i++) {
1280                 if (method->agent[i] == agent) {
1281                         method->agent[i] = NULL;
1282                 }
1283         }
1284 }
1285
1286 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1287                               struct ib_mad_agent_private *agent_priv,
1288                               u8 mgmt_class)
1289 {
1290         struct ib_mad_port_private *port_priv;
1291         struct ib_mad_mgmt_class_table **class;
1292         struct ib_mad_mgmt_method_table **method;
1293         int i, ret;
1294
1295         port_priv = agent_priv->qp_info->port_priv;
1296         class = &port_priv->version[mad_reg_req->mgmt_class_version].class;
1297         if (!*class) {
1298                 /* Allocate management class table for "new" class version */
1299                 *class = kzalloc(sizeof **class, GFP_ATOMIC);
1300                 if (!*class) {
1301                         printk(KERN_ERR PFX "No memory for "
1302                                "ib_mad_mgmt_class_table\n");
1303                         ret = -ENOMEM;
1304                         goto error1;
1305                 }
1306
1307                 /* Allocate method table for this management class */
1308                 method = &(*class)->method_table[mgmt_class];
1309                 if ((ret = allocate_method_table(method)))
1310                         goto error2;
1311         } else {
1312                 method = &(*class)->method_table[mgmt_class];
1313                 if (!*method) {
1314                         /* Allocate method table for this management class */
1315                         if ((ret = allocate_method_table(method)))
1316                                 goto error1;
1317                 }
1318         }
1319
1320         /* Now, make sure methods are not already in use */
1321         if (method_in_use(method, mad_reg_req))
1322                 goto error3;
1323
1324         /* Finally, add in methods being registered */
1325         for (i = find_first_bit(mad_reg_req->method_mask,
1326                                 IB_MGMT_MAX_METHODS);
1327              i < IB_MGMT_MAX_METHODS;
1328              i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1329                                1+i)) {
1330                 (*method)->agent[i] = agent_priv;
1331         }
1332         return 0;
1333
1334 error3:
1335         /* Remove any methods for this mad agent */
1336         remove_methods_mad_agent(*method, agent_priv);
1337         /* Now, check to see if there are any methods in use */
1338         if (!check_method_table(*method)) {
1339                 /* If not, release management method table */
1340                 kfree(*method);
1341                 *method = NULL;
1342         }
1343         ret = -EINVAL;
1344         goto error1;
1345 error2:
1346         kfree(*class);
1347         *class = NULL;
1348 error1:
1349         return ret;
1350 }
1351
1352 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1353                            struct ib_mad_agent_private *agent_priv)
1354 {
1355         struct ib_mad_port_private *port_priv;
1356         struct ib_mad_mgmt_vendor_class_table **vendor_table;
1357         struct ib_mad_mgmt_vendor_class_table *vendor = NULL;
1358         struct ib_mad_mgmt_vendor_class *vendor_class = NULL;
1359         struct ib_mad_mgmt_method_table **method;
1360         int i, ret = -ENOMEM;
1361         u8 vclass;
1362
1363         /* "New" vendor (with OUI) class */
1364         vclass = vendor_class_index(mad_reg_req->mgmt_class);
1365         port_priv = agent_priv->qp_info->port_priv;
1366         vendor_table = &port_priv->version[
1367                                 mad_reg_req->mgmt_class_version].vendor;
1368         if (!*vendor_table) {
1369                 /* Allocate mgmt vendor class table for "new" class version */
1370                 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC);
1371                 if (!vendor) {
1372                         printk(KERN_ERR PFX "No memory for "
1373                                "ib_mad_mgmt_vendor_class_table\n");
1374                         goto error1;
1375                 }
1376
1377                 *vendor_table = vendor;
1378         }
1379         if (!(*vendor_table)->vendor_class[vclass]) {
1380                 /* Allocate table for this management vendor class */
1381                 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC);
1382                 if (!vendor_class) {
1383                         printk(KERN_ERR PFX "No memory for "
1384                                "ib_mad_mgmt_vendor_class\n");
1385                         goto error2;
1386                 }
1387
1388                 (*vendor_table)->vendor_class[vclass] = vendor_class;
1389         }
1390         for (i = 0; i < MAX_MGMT_OUI; i++) {
1391                 /* Is there matching OUI for this vendor class ? */
1392                 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i],
1393                             mad_reg_req->oui, 3)) {
1394                         method = &(*vendor_table)->vendor_class[
1395                                                 vclass]->method_table[i];
1396                         BUG_ON(!*method);
1397                         goto check_in_use;
1398                 }
1399         }
1400         for (i = 0; i < MAX_MGMT_OUI; i++) {
1401                 /* OUI slot available ? */
1402                 if (!is_vendor_oui((*vendor_table)->vendor_class[
1403                                 vclass]->oui[i])) {
1404                         method = &(*vendor_table)->vendor_class[
1405                                 vclass]->method_table[i];
1406                         BUG_ON(*method);
1407                         /* Allocate method table for this OUI */
1408                         if ((ret = allocate_method_table(method)))
1409                                 goto error3;
1410                         memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
1411                                mad_reg_req->oui, 3);
1412                         goto check_in_use;
1413                 }
1414         }
1415         printk(KERN_ERR PFX "All OUI slots in use\n");
1416         goto error3;
1417
1418 check_in_use:
1419         /* Now, make sure methods are not already in use */
1420         if (method_in_use(method, mad_reg_req))
1421                 goto error4;
1422
1423         /* Finally, add in methods being registered */
1424         for (i = find_first_bit(mad_reg_req->method_mask,
1425                                 IB_MGMT_MAX_METHODS);
1426              i < IB_MGMT_MAX_METHODS;
1427              i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1428                                1+i)) {
1429                 (*method)->agent[i] = agent_priv;
1430         }
1431         return 0;
1432
1433 error4:
1434         /* Remove any methods for this mad agent */
1435         remove_methods_mad_agent(*method, agent_priv);
1436         /* Now, check to see if there are any methods in use */
1437         if (!check_method_table(*method)) {
1438                 /* If not, release management method table */
1439                 kfree(*method);
1440                 *method = NULL;
1441         }
1442         ret = -EINVAL;
1443 error3:
1444         if (vendor_class) {
1445                 (*vendor_table)->vendor_class[vclass] = NULL;
1446                 kfree(vendor_class);
1447         }
1448 error2:
1449         if (vendor) {
1450                 *vendor_table = NULL;
1451                 kfree(vendor);
1452         }
1453 error1:
1454         return ret;
1455 }
1456
1457 static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv)
1458 {
1459         struct ib_mad_port_private *port_priv;
1460         struct ib_mad_mgmt_class_table *class;
1461         struct ib_mad_mgmt_method_table *method;
1462         struct ib_mad_mgmt_vendor_class_table *vendor;
1463         struct ib_mad_mgmt_vendor_class *vendor_class;
1464         int index;
1465         u8 mgmt_class;
1466
1467         /*
1468          * Was MAD registration request supplied
1469          * with original registration ?
1470          */
1471         if (!agent_priv->reg_req) {
1472                 goto out;
1473         }
1474
1475         port_priv = agent_priv->qp_info->port_priv;
1476         mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class);
1477         class = port_priv->version[
1478                         agent_priv->reg_req->mgmt_class_version].class;
1479         if (!class)
1480                 goto vendor_check;
1481
1482         method = class->method_table[mgmt_class];
1483         if (method) {
1484                 /* Remove any methods for this mad agent */
1485                 remove_methods_mad_agent(method, agent_priv);
1486                 /* Now, check to see if there are any methods still in use */
1487                 if (!check_method_table(method)) {
1488                         /* If not, release management method table */
1489                          kfree(method);
1490                          class->method_table[mgmt_class] = NULL;
1491                          /* Any management classes left ? */
1492                         if (!check_class_table(class)) {
1493                                 /* If not, release management class table */
1494                                 kfree(class);
1495                                 port_priv->version[
1496                                         agent_priv->reg_req->
1497                                         mgmt_class_version].class = NULL;
1498                         }
1499                 }
1500         }
1501
1502 vendor_check:
1503         if (!is_vendor_class(mgmt_class))
1504                 goto out;
1505
1506         /* normalize mgmt_class to vendor range 2 */
1507         mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class);
1508         vendor = port_priv->version[
1509                         agent_priv->reg_req->mgmt_class_version].vendor;
1510
1511         if (!vendor)
1512                 goto out;
1513
1514         vendor_class = vendor->vendor_class[mgmt_class];
1515         if (vendor_class) {
1516                 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui);
1517                 if (index < 0)
1518                         goto out;
1519                 method = vendor_class->method_table[index];
1520                 if (method) {
1521                         /* Remove any methods for this mad agent */
1522                         remove_methods_mad_agent(method, agent_priv);
1523                         /*
1524                          * Now, check to see if there are
1525                          * any methods still in use
1526                          */
1527                         if (!check_method_table(method)) {
1528                                 /* If not, release management method table */
1529                                 kfree(method);
1530                                 vendor_class->method_table[index] = NULL;
1531                                 memset(vendor_class->oui[index], 0, 3);
1532                                 /* Any OUIs left ? */
1533                                 if (!check_vendor_class(vendor_class)) {
1534                                         /* If not, release vendor class table */
1535                                         kfree(vendor_class);
1536                                         vendor->vendor_class[mgmt_class] = NULL;
1537                                         /* Any other vendor classes left ? */
1538                                         if (!check_vendor_table(vendor)) {
1539                                                 kfree(vendor);
1540                                                 port_priv->version[
1541                                                         agent_priv->reg_req->
1542                                                         mgmt_class_version].
1543                                                         vendor = NULL;
1544                                         }
1545                                 }
1546                         }
1547                 }
1548         }
1549
1550 out:
1551         return;
1552 }
1553
1554 static struct ib_mad_agent_private *
1555 find_mad_agent(struct ib_mad_port_private *port_priv,
1556                struct ib_mad *mad)
1557 {
1558         struct ib_mad_agent_private *mad_agent = NULL;
1559         unsigned long flags;
1560
1561         spin_lock_irqsave(&port_priv->reg_lock, flags);
1562         if (ib_response_mad(mad)) {
1563                 u32 hi_tid;
1564                 struct ib_mad_agent_private *entry;
1565
1566                 /*
1567                  * Routing is based on high 32 bits of transaction ID
1568                  * of MAD.
1569                  */
1570                 hi_tid = be64_to_cpu(mad->mad_hdr.tid) >> 32;
1571                 list_for_each_entry(entry, &port_priv->agent_list, agent_list) {
1572                         if (entry->agent.hi_tid == hi_tid) {
1573                                 mad_agent = entry;
1574                                 break;
1575                         }
1576                 }
1577         } else {
1578                 struct ib_mad_mgmt_class_table *class;
1579                 struct ib_mad_mgmt_method_table *method;
1580                 struct ib_mad_mgmt_vendor_class_table *vendor;
1581                 struct ib_mad_mgmt_vendor_class *vendor_class;
1582                 struct ib_vendor_mad *vendor_mad;
1583                 int index;
1584
1585                 /*
1586                  * Routing is based on version, class, and method
1587                  * For "newer" vendor MADs, also based on OUI
1588                  */
1589                 if (mad->mad_hdr.class_version >= MAX_MGMT_VERSION)
1590                         goto out;
1591                 if (!is_vendor_class(mad->mad_hdr.mgmt_class)) {
1592                         class = port_priv->version[
1593                                         mad->mad_hdr.class_version].class;
1594                         if (!class)
1595                                 goto out;
1596                         method = class->method_table[convert_mgmt_class(
1597                                                         mad->mad_hdr.mgmt_class)];
1598                         if (method)
1599                                 mad_agent = method->agent[mad->mad_hdr.method &
1600                                                           ~IB_MGMT_METHOD_RESP];
1601                 } else {
1602                         vendor = port_priv->version[
1603                                         mad->mad_hdr.class_version].vendor;
1604                         if (!vendor)
1605                                 goto out;
1606                         vendor_class = vendor->vendor_class[vendor_class_index(
1607                                                 mad->mad_hdr.mgmt_class)];
1608                         if (!vendor_class)
1609                                 goto out;
1610                         /* Find matching OUI */
1611                         vendor_mad = (struct ib_vendor_mad *)mad;
1612                         index = find_vendor_oui(vendor_class, vendor_mad->oui);
1613                         if (index == -1)
1614                                 goto out;
1615                         method = vendor_class->method_table[index];
1616                         if (method) {
1617                                 mad_agent = method->agent[mad->mad_hdr.method &
1618                                                           ~IB_MGMT_METHOD_RESP];
1619                         }
1620                 }
1621         }
1622
1623         if (mad_agent) {
1624                 if (mad_agent->agent.recv_handler)
1625                         atomic_inc(&mad_agent->refcount);
1626                 else {
1627                         printk(KERN_NOTICE PFX "No receive handler for client "
1628                                "%p on port %d\n",
1629                                &mad_agent->agent, port_priv->port_num);
1630                         mad_agent = NULL;
1631                 }
1632         }
1633 out:
1634         spin_unlock_irqrestore(&port_priv->reg_lock, flags);
1635
1636         return mad_agent;
1637 }
1638
1639 static int validate_mad(struct ib_mad *mad, u32 qp_num)
1640 {
1641         int valid = 0;
1642
1643         /* Make sure MAD base version is understood */
1644         if (mad->mad_hdr.base_version != IB_MGMT_BASE_VERSION) {
1645                 printk(KERN_ERR PFX "MAD received with unsupported base "
1646                        "version %d\n", mad->mad_hdr.base_version);
1647                 goto out;
1648         }
1649
1650         /* Filter SMI packets sent to other than QP0 */
1651         if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
1652             (mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
1653                 if (qp_num == 0)
1654                         valid = 1;
1655         } else {
1656                 /* Filter GSI packets sent to QP0 */
1657                 if (qp_num != 0)
1658                         valid = 1;
1659         }
1660
1661 out:
1662         return valid;
1663 }
1664
1665 static int is_data_mad(struct ib_mad_agent_private *mad_agent_priv,
1666                        struct ib_mad_hdr *mad_hdr)
1667 {
1668         struct ib_rmpp_mad *rmpp_mad;
1669
1670         rmpp_mad = (struct ib_rmpp_mad *)mad_hdr;
1671         return !mad_agent_priv->agent.rmpp_version ||
1672                 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
1673                                     IB_MGMT_RMPP_FLAG_ACTIVE) ||
1674                 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA);
1675 }
1676
1677 static inline int rcv_has_same_class(struct ib_mad_send_wr_private *wr,
1678                                      struct ib_mad_recv_wc *rwc)
1679 {
1680         return ((struct ib_mad *)(wr->send_buf.mad))->mad_hdr.mgmt_class ==
1681                 rwc->recv_buf.mad->mad_hdr.mgmt_class;
1682 }
1683
1684 static inline int rcv_has_same_gid(struct ib_mad_agent_private *mad_agent_priv,
1685                                    struct ib_mad_send_wr_private *wr,
1686                                    struct ib_mad_recv_wc *rwc )
1687 {
1688         struct ib_ah_attr attr;
1689         u8 send_resp, rcv_resp;
1690         union ib_gid sgid;
1691         struct ib_device *device = mad_agent_priv->agent.device;
1692         u8 port_num = mad_agent_priv->agent.port_num;
1693         u8 lmc;
1694
1695         send_resp = ib_response_mad((struct ib_mad *)wr->send_buf.mad);
1696         rcv_resp = ib_response_mad(rwc->recv_buf.mad);
1697
1698         if (send_resp == rcv_resp)
1699                 /* both requests, or both responses. GIDs different */
1700                 return 0;
1701
1702         if (ib_query_ah(wr->send_buf.ah, &attr))
1703                 /* Assume not equal, to avoid false positives. */
1704                 return 0;
1705
1706         if (!!(attr.ah_flags & IB_AH_GRH) !=
1707             !!(rwc->wc->wc_flags & IB_WC_GRH))
1708                 /* one has GID, other does not.  Assume different */
1709                 return 0;
1710
1711         if (!send_resp && rcv_resp) {
1712                 /* is request/response. */
1713                 if (!(attr.ah_flags & IB_AH_GRH)) {
1714                         if (ib_get_cached_lmc(device, port_num, &lmc))
1715                                 return 0;
1716                         return (!lmc || !((attr.src_path_bits ^
1717                                            rwc->wc->dlid_path_bits) &
1718                                           ((1 << lmc) - 1)));
1719                 } else {
1720                         if (ib_get_cached_gid(device, port_num,
1721                                               attr.grh.sgid_index, &sgid))
1722                                 return 0;
1723                         return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw,
1724                                        16);
1725                 }
1726         }
1727
1728         if (!(attr.ah_flags & IB_AH_GRH))
1729                 return attr.dlid == rwc->wc->slid;
1730         else
1731                 return !memcmp(attr.grh.dgid.raw, rwc->recv_buf.grh->sgid.raw,
1732                                16);
1733 }
1734
1735 static inline int is_direct(u8 class)
1736 {
1737         return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE);
1738 }
1739
1740 struct ib_mad_send_wr_private*
1741 ib_find_send_mad(struct ib_mad_agent_private *mad_agent_priv,
1742                  struct ib_mad_recv_wc *wc)
1743 {
1744         struct ib_mad_send_wr_private *wr;
1745         struct ib_mad *mad;
1746
1747         mad = (struct ib_mad *)wc->recv_buf.mad;
1748
1749         list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) {
1750                 if ((wr->tid == mad->mad_hdr.tid) &&
1751                     rcv_has_same_class(wr, wc) &&
1752                     /*
1753                      * Don't check GID for direct routed MADs.
1754                      * These might have permissive LIDs.
1755                      */
1756                     (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) ||
1757                      rcv_has_same_gid(mad_agent_priv, wr, wc)))
1758                         return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1759         }
1760
1761         /*
1762          * It's possible to receive the response before we've
1763          * been notified that the send has completed
1764          */
1765         list_for_each_entry(wr, &mad_agent_priv->send_list, agent_list) {
1766                 if (is_data_mad(mad_agent_priv, wr->send_buf.mad) &&
1767                     wr->tid == mad->mad_hdr.tid &&
1768                     wr->timeout &&
1769                     rcv_has_same_class(wr, wc) &&
1770                     /*
1771                      * Don't check GID for direct routed MADs.
1772                      * These might have permissive LIDs.
1773                      */
1774                     (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) ||
1775                      rcv_has_same_gid(mad_agent_priv, wr, wc)))
1776                         /* Verify request has not been canceled */
1777                         return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1778         }
1779         return NULL;
1780 }
1781
1782 void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr)
1783 {
1784         mad_send_wr->timeout = 0;
1785         if (mad_send_wr->refcount == 1)
1786                 list_move_tail(&mad_send_wr->agent_list,
1787                               &mad_send_wr->mad_agent_priv->done_list);
1788 }
1789
1790 static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
1791                                  struct ib_mad_recv_wc *mad_recv_wc)
1792 {
1793         struct ib_mad_send_wr_private *mad_send_wr;
1794         struct ib_mad_send_wc mad_send_wc;
1795         unsigned long flags;
1796
1797         INIT_LIST_HEAD(&mad_recv_wc->rmpp_list);
1798         list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list);
1799         if (mad_agent_priv->agent.rmpp_version) {
1800                 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv,
1801                                                       mad_recv_wc);
1802                 if (!mad_recv_wc) {
1803                         deref_mad_agent(mad_agent_priv);
1804                         return;
1805                 }
1806         }
1807
1808         /* Complete corresponding request */
1809         if (ib_response_mad(mad_recv_wc->recv_buf.mad)) {
1810                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1811                 mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc);
1812                 if (!mad_send_wr) {
1813                         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1814                         ib_free_recv_mad(mad_recv_wc);
1815                         deref_mad_agent(mad_agent_priv);
1816                         return;
1817                 }
1818                 ib_mark_mad_done(mad_send_wr);
1819                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1820
1821                 /* Defined behavior is to complete response before request */
1822                 mad_recv_wc->wc->wr_id = (unsigned long) &mad_send_wr->send_buf;
1823                 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1824                                                    mad_recv_wc);
1825                 atomic_dec(&mad_agent_priv->refcount);
1826
1827                 mad_send_wc.status = IB_WC_SUCCESS;
1828                 mad_send_wc.vendor_err = 0;
1829                 mad_send_wc.send_buf = &mad_send_wr->send_buf;
1830                 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
1831         } else {
1832                 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1833                                                    mad_recv_wc);
1834                 deref_mad_agent(mad_agent_priv);
1835         }
1836 }
1837
1838 static void ib_mad_recv_done_handler(struct ib_mad_port_private *port_priv,
1839                                      struct ib_wc *wc)
1840 {
1841         struct ib_mad_qp_info *qp_info;
1842         struct ib_mad_private_header *mad_priv_hdr;
1843         struct ib_mad_private *recv, *response = NULL;
1844         struct ib_mad_list_head *mad_list;
1845         struct ib_mad_agent_private *mad_agent;
1846         int port_num;
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         response = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
1876         if (!response) {
1877                 printk(KERN_ERR PFX "ib_mad_recv_done_handler no memory "
1878                        "for response buffer\n");
1879                 goto out;
1880         }
1881
1882         if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH)
1883                 port_num = wc->port_num;
1884         else
1885                 port_num = port_priv->port_num;
1886
1887         if (recv->mad.mad.mad_hdr.mgmt_class ==
1888             IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1889                 enum smi_forward_action retsmi;
1890
1891                 if (smi_handle_dr_smp_recv(&recv->mad.smp,
1892                                            port_priv->device->node_type,
1893                                            port_num,
1894                                            port_priv->device->phys_port_cnt) ==
1895                                            IB_SMI_DISCARD)
1896                         goto out;
1897
1898                 retsmi = smi_check_forward_dr_smp(&recv->mad.smp);
1899                 if (retsmi == IB_SMI_LOCAL)
1900                         goto local;
1901
1902                 if (retsmi == IB_SMI_SEND) { /* don't forward */
1903                         if (smi_handle_dr_smp_send(&recv->mad.smp,
1904                                                    port_priv->device->node_type,
1905                                                    port_num) == IB_SMI_DISCARD)
1906                                 goto out;
1907
1908                         if (smi_check_local_smp(&recv->mad.smp, port_priv->device) == IB_SMI_DISCARD)
1909                                 goto out;
1910                 } else if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH) {
1911                         /* forward case for switches */
1912                         memcpy(response, recv, sizeof(*response));
1913                         response->header.recv_wc.wc = &response->header.wc;
1914                         response->header.recv_wc.recv_buf.mad = &response->mad.mad;
1915                         response->header.recv_wc.recv_buf.grh = &response->grh;
1916
1917                         agent_send_response(&response->mad.mad,
1918                                             &response->grh, wc,
1919                                             port_priv->device,
1920                                             smi_get_fwd_port(&recv->mad.smp),
1921                                             qp_info->qp->qp_num);
1922
1923                         goto out;
1924                 }
1925         }
1926
1927 local:
1928         /* Give driver "right of first refusal" on incoming MAD */
1929         if (port_priv->device->process_mad) {
1930                 int ret;
1931
1932                 ret = port_priv->device->process_mad(port_priv->device, 0,
1933                                                      port_priv->port_num,
1934                                                      wc, &recv->grh,
1935                                                      &recv->mad.mad,
1936                                                      &response->mad.mad);
1937                 if (ret & IB_MAD_RESULT_SUCCESS) {
1938                         if (ret & IB_MAD_RESULT_CONSUMED)
1939                                 goto out;
1940                         if (ret & IB_MAD_RESULT_REPLY) {
1941                                 agent_send_response(&response->mad.mad,
1942                                                     &recv->grh, wc,
1943                                                     port_priv->device,
1944                                                     port_num,
1945                                                     qp_info->qp->qp_num);
1946                                 goto out;
1947                         }
1948                 }
1949         }
1950
1951         mad_agent = find_mad_agent(port_priv, &recv->mad.mad);
1952         if (mad_agent) {
1953                 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
1954                 /*
1955                  * recv is freed up in error cases in ib_mad_complete_recv
1956                  * or via recv_handler in ib_mad_complete_recv()
1957                  */
1958                 recv = NULL;
1959         }
1960
1961 out:
1962         /* Post another receive request for this QP */
1963         if (response) {
1964                 ib_mad_post_receive_mads(qp_info, response);
1965                 if (recv)
1966                         kmem_cache_free(ib_mad_cache, recv);
1967         } else
1968                 ib_mad_post_receive_mads(qp_info, recv);
1969 }
1970
1971 static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
1972 {
1973         struct ib_mad_send_wr_private *mad_send_wr;
1974         unsigned long delay;
1975
1976         if (list_empty(&mad_agent_priv->wait_list)) {
1977                 cancel_delayed_work(&mad_agent_priv->timed_work);
1978         } else {
1979                 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
1980                                          struct ib_mad_send_wr_private,
1981                                          agent_list);
1982
1983                 if (time_after(mad_agent_priv->timeout,
1984                                mad_send_wr->timeout)) {
1985                         mad_agent_priv->timeout = mad_send_wr->timeout;
1986                         cancel_delayed_work(&mad_agent_priv->timed_work);
1987                         delay = mad_send_wr->timeout - jiffies;
1988                         if ((long)delay <= 0)
1989                                 delay = 1;
1990                         queue_delayed_work(mad_agent_priv->qp_info->
1991                                            port_priv->wq,
1992                                            &mad_agent_priv->timed_work, delay);
1993                 }
1994         }
1995 }
1996
1997 static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
1998 {
1999         struct ib_mad_agent_private *mad_agent_priv;
2000         struct ib_mad_send_wr_private *temp_mad_send_wr;
2001         struct list_head *list_item;
2002         unsigned long delay;
2003
2004         mad_agent_priv = mad_send_wr->mad_agent_priv;
2005         list_del(&mad_send_wr->agent_list);
2006
2007         delay = mad_send_wr->timeout;
2008         mad_send_wr->timeout += jiffies;
2009
2010         if (delay) {
2011                 list_for_each_prev(list_item, &mad_agent_priv->wait_list) {
2012                         temp_mad_send_wr = list_entry(list_item,
2013                                                 struct ib_mad_send_wr_private,
2014                                                 agent_list);
2015                         if (time_after(mad_send_wr->timeout,
2016                                        temp_mad_send_wr->timeout))
2017                                 break;
2018                 }
2019         }
2020         else
2021                 list_item = &mad_agent_priv->wait_list;
2022         list_add(&mad_send_wr->agent_list, list_item);
2023
2024         /* Reschedule a work item if we have a shorter timeout */
2025         if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list) {
2026                 cancel_delayed_work(&mad_agent_priv->timed_work);
2027                 queue_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2028                                    &mad_agent_priv->timed_work, delay);
2029         }
2030 }
2031
2032 void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr,
2033                           int timeout_ms)
2034 {
2035         mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2036         wait_for_response(mad_send_wr);
2037 }
2038
2039 /*
2040  * Process a send work completion
2041  */
2042 void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
2043                              struct ib_mad_send_wc *mad_send_wc)
2044 {
2045         struct ib_mad_agent_private     *mad_agent_priv;
2046         unsigned long                   flags;
2047         int                             ret;
2048
2049         mad_agent_priv = mad_send_wr->mad_agent_priv;
2050         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2051         if (mad_agent_priv->agent.rmpp_version) {
2052                 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc);
2053                 if (ret == IB_RMPP_RESULT_CONSUMED)
2054                         goto done;
2055         } else
2056                 ret = IB_RMPP_RESULT_UNHANDLED;
2057
2058         if (mad_send_wc->status != IB_WC_SUCCESS &&
2059             mad_send_wr->status == IB_WC_SUCCESS) {
2060                 mad_send_wr->status = mad_send_wc->status;
2061                 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2062         }
2063
2064         if (--mad_send_wr->refcount > 0) {
2065                 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout &&
2066                     mad_send_wr->status == IB_WC_SUCCESS) {
2067                         wait_for_response(mad_send_wr);
2068                 }
2069                 goto done;
2070         }
2071
2072         /* Remove send from MAD agent and notify client of completion */
2073         list_del(&mad_send_wr->agent_list);
2074         adjust_timeout(mad_agent_priv);
2075         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2076
2077         if (mad_send_wr->status != IB_WC_SUCCESS )
2078                 mad_send_wc->status = mad_send_wr->status;
2079         if (ret == IB_RMPP_RESULT_INTERNAL)
2080                 ib_rmpp_send_handler(mad_send_wc);
2081         else
2082                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2083                                                    mad_send_wc);
2084
2085         /* Release reference on agent taken when sending */
2086         deref_mad_agent(mad_agent_priv);
2087         return;
2088 done:
2089         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2090 }
2091
2092 static void ib_mad_send_done_handler(struct ib_mad_port_private *port_priv,
2093                                      struct ib_wc *wc)
2094 {
2095         struct ib_mad_send_wr_private   *mad_send_wr, *queued_send_wr;
2096         struct ib_mad_list_head         *mad_list;
2097         struct ib_mad_qp_info           *qp_info;
2098         struct ib_mad_queue             *send_queue;
2099         struct ib_send_wr               *bad_send_wr;
2100         struct ib_mad_send_wc           mad_send_wc;
2101         unsigned long flags;
2102         int ret;
2103
2104         mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2105         mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2106                                    mad_list);
2107         send_queue = mad_list->mad_queue;
2108         qp_info = send_queue->qp_info;
2109
2110 retry:
2111         ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2112                             mad_send_wr->header_mapping,
2113                             mad_send_wr->sg_list[0].length, DMA_TO_DEVICE);
2114         ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2115                             mad_send_wr->payload_mapping,
2116                             mad_send_wr->sg_list[1].length, DMA_TO_DEVICE);
2117         queued_send_wr = NULL;
2118         spin_lock_irqsave(&send_queue->lock, flags);
2119         list_del(&mad_list->list);
2120
2121         /* Move queued send to the send queue */
2122         if (send_queue->count-- > send_queue->max_active) {
2123                 mad_list = container_of(qp_info->overflow_list.next,
2124                                         struct ib_mad_list_head, list);
2125                 queued_send_wr = container_of(mad_list,
2126                                         struct ib_mad_send_wr_private,
2127                                         mad_list);
2128                 list_move_tail(&mad_list->list, &send_queue->list);
2129         }
2130         spin_unlock_irqrestore(&send_queue->lock, flags);
2131
2132         mad_send_wc.send_buf = &mad_send_wr->send_buf;
2133         mad_send_wc.status = wc->status;
2134         mad_send_wc.vendor_err = wc->vendor_err;
2135         if (atomic_read(&qp_info->snoop_count))
2136                 snoop_send(qp_info, &mad_send_wr->send_buf, &mad_send_wc,
2137                            IB_MAD_SNOOP_SEND_COMPLETIONS);
2138         ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
2139
2140         if (queued_send_wr) {
2141                 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr,
2142                                    &bad_send_wr);
2143                 if (ret) {
2144                         printk(KERN_ERR PFX "ib_post_send failed: %d\n", ret);
2145                         mad_send_wr = queued_send_wr;
2146                         wc->status = IB_WC_LOC_QP_OP_ERR;
2147                         goto retry;
2148                 }
2149         }
2150 }
2151
2152 static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info)
2153 {
2154         struct ib_mad_send_wr_private *mad_send_wr;
2155         struct ib_mad_list_head *mad_list;
2156         unsigned long flags;
2157
2158         spin_lock_irqsave(&qp_info->send_queue.lock, flags);
2159         list_for_each_entry(mad_list, &qp_info->send_queue.list, list) {
2160                 mad_send_wr = container_of(mad_list,
2161                                            struct ib_mad_send_wr_private,
2162                                            mad_list);
2163                 mad_send_wr->retry = 1;
2164         }
2165         spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
2166 }
2167
2168 static void mad_error_handler(struct ib_mad_port_private *port_priv,
2169                               struct ib_wc *wc)
2170 {
2171         struct ib_mad_list_head *mad_list;
2172         struct ib_mad_qp_info *qp_info;
2173         struct ib_mad_send_wr_private *mad_send_wr;
2174         int ret;
2175
2176         /* Determine if failure was a send or receive */
2177         mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2178         qp_info = mad_list->mad_queue->qp_info;
2179         if (mad_list->mad_queue == &qp_info->recv_queue)
2180                 /*
2181                  * Receive errors indicate that the QP has entered the error
2182                  * state - error handling/shutdown code will cleanup
2183                  */
2184                 return;
2185
2186         /*
2187          * Send errors will transition the QP to SQE - move
2188          * QP to RTS and repost flushed work requests
2189          */
2190         mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2191                                    mad_list);
2192         if (wc->status == IB_WC_WR_FLUSH_ERR) {
2193                 if (mad_send_wr->retry) {
2194                         /* Repost send */
2195                         struct ib_send_wr *bad_send_wr;
2196
2197                         mad_send_wr->retry = 0;
2198                         ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr,
2199                                         &bad_send_wr);
2200                         if (ret)
2201                                 ib_mad_send_done_handler(port_priv, wc);
2202                 } else
2203                         ib_mad_send_done_handler(port_priv, wc);
2204         } else {
2205                 struct ib_qp_attr *attr;
2206
2207                 /* Transition QP to RTS and fail offending send */
2208                 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2209                 if (attr) {
2210                         attr->qp_state = IB_QPS_RTS;
2211                         attr->cur_qp_state = IB_QPS_SQE;
2212                         ret = ib_modify_qp(qp_info->qp, attr,
2213                                            IB_QP_STATE | IB_QP_CUR_STATE);
2214                         kfree(attr);
2215                         if (ret)
2216                                 printk(KERN_ERR PFX "mad_error_handler - "
2217                                        "ib_modify_qp to RTS : %d\n", ret);
2218                         else
2219                                 mark_sends_for_retry(qp_info);
2220                 }
2221                 ib_mad_send_done_handler(port_priv, wc);
2222         }
2223 }
2224
2225 /*
2226  * IB MAD completion callback
2227  */
2228 static void ib_mad_completion_handler(struct work_struct *work)
2229 {
2230         struct ib_mad_port_private *port_priv;
2231         struct ib_wc wc;
2232
2233         port_priv = container_of(work, struct ib_mad_port_private, work);
2234         ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2235
2236         while (ib_poll_cq(port_priv->cq, 1, &wc) == 1) {
2237                 if (wc.status == IB_WC_SUCCESS) {
2238                         switch (wc.opcode) {
2239                         case IB_WC_SEND:
2240                                 ib_mad_send_done_handler(port_priv, &wc);
2241                                 break;
2242                         case IB_WC_RECV:
2243                                 ib_mad_recv_done_handler(port_priv, &wc);
2244                                 break;
2245                         default:
2246                                 BUG_ON(1);
2247                                 break;
2248                         }
2249                 } else
2250                         mad_error_handler(port_priv, &wc);
2251         }
2252 }
2253
2254 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
2255 {
2256         unsigned long flags;
2257         struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr;
2258         struct ib_mad_send_wc mad_send_wc;
2259         struct list_head cancel_list;
2260
2261         INIT_LIST_HEAD(&cancel_list);
2262
2263         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2264         list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2265                                  &mad_agent_priv->send_list, agent_list) {
2266                 if (mad_send_wr->status == IB_WC_SUCCESS) {
2267                         mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2268                         mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2269                 }
2270         }
2271
2272         /* Empty wait list to prevent receives from finding a request */
2273         list_splice_init(&mad_agent_priv->wait_list, &cancel_list);
2274         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2275
2276         /* Report all cancelled requests */
2277         mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
2278         mad_send_wc.vendor_err = 0;
2279
2280         list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2281                                  &cancel_list, agent_list) {
2282                 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2283                 list_del(&mad_send_wr->agent_list);
2284                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2285                                                    &mad_send_wc);
2286                 atomic_dec(&mad_agent_priv->refcount);
2287         }
2288 }
2289
2290 static struct ib_mad_send_wr_private*
2291 find_send_wr(struct ib_mad_agent_private *mad_agent_priv,
2292              struct ib_mad_send_buf *send_buf)
2293 {
2294         struct ib_mad_send_wr_private *mad_send_wr;
2295
2296         list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
2297                             agent_list) {
2298                 if (&mad_send_wr->send_buf == send_buf)
2299                         return mad_send_wr;
2300         }
2301
2302         list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
2303                             agent_list) {
2304                 if (is_data_mad(mad_agent_priv, mad_send_wr->send_buf.mad) &&
2305                     &mad_send_wr->send_buf == send_buf)
2306                         return mad_send_wr;
2307         }
2308         return NULL;
2309 }
2310
2311 int ib_modify_mad(struct ib_mad_agent *mad_agent,
2312                   struct ib_mad_send_buf *send_buf, u32 timeout_ms)
2313 {
2314         struct ib_mad_agent_private *mad_agent_priv;
2315         struct ib_mad_send_wr_private *mad_send_wr;
2316         unsigned long flags;
2317         int active;
2318
2319         mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
2320                                       agent);
2321         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2322         mad_send_wr = find_send_wr(mad_agent_priv, send_buf);
2323         if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) {
2324                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2325                 return -EINVAL;
2326         }
2327
2328         active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1);
2329         if (!timeout_ms) {
2330                 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2331                 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2332         }
2333
2334         mad_send_wr->send_buf.timeout_ms = timeout_ms;
2335         if (active)
2336                 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2337         else
2338                 ib_reset_mad_timeout(mad_send_wr, timeout_ms);
2339
2340         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2341         return 0;
2342 }
2343 EXPORT_SYMBOL(ib_modify_mad);
2344
2345 void ib_cancel_mad(struct ib_mad_agent *mad_agent,
2346                    struct ib_mad_send_buf *send_buf)
2347 {
2348         ib_modify_mad(mad_agent, send_buf, 0);
2349 }
2350 EXPORT_SYMBOL(ib_cancel_mad);
2351
2352 static void local_completions(struct work_struct *work)
2353 {
2354         struct ib_mad_agent_private *mad_agent_priv;
2355         struct ib_mad_local_private *local;
2356         struct ib_mad_agent_private *recv_mad_agent;
2357         unsigned long flags;
2358         int free_mad;
2359         struct ib_wc wc;
2360         struct ib_mad_send_wc mad_send_wc;
2361
2362         mad_agent_priv =
2363                 container_of(work, struct ib_mad_agent_private, local_work);
2364
2365         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2366         while (!list_empty(&mad_agent_priv->local_list)) {
2367                 local = list_entry(mad_agent_priv->local_list.next,
2368                                    struct ib_mad_local_private,
2369                                    completion_list);
2370                 list_del(&local->completion_list);
2371                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2372                 free_mad = 0;
2373                 if (local->mad_priv) {
2374                         recv_mad_agent = local->recv_mad_agent;
2375                         if (!recv_mad_agent) {
2376                                 printk(KERN_ERR PFX "No receive MAD agent for local completion\n");
2377                                 free_mad = 1;
2378                                 goto local_send_completion;
2379                         }
2380
2381                         /*
2382                          * Defined behavior is to complete response
2383                          * before request
2384                          */
2385                         build_smp_wc(recv_mad_agent->agent.qp,
2386                                      (unsigned long) local->mad_send_wr,
2387                                      be16_to_cpu(IB_LID_PERMISSIVE),
2388                                      0, recv_mad_agent->agent.port_num, &wc);
2389
2390                         local->mad_priv->header.recv_wc.wc = &wc;
2391                         local->mad_priv->header.recv_wc.mad_len =
2392                                                 sizeof(struct ib_mad);
2393                         INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list);
2394                         list_add(&local->mad_priv->header.recv_wc.recv_buf.list,
2395                                  &local->mad_priv->header.recv_wc.rmpp_list);
2396                         local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
2397                         local->mad_priv->header.recv_wc.recv_buf.mad =
2398                                                 &local->mad_priv->mad.mad;
2399                         if (atomic_read(&recv_mad_agent->qp_info->snoop_count))
2400                                 snoop_recv(recv_mad_agent->qp_info,
2401                                           &local->mad_priv->header.recv_wc,
2402                                            IB_MAD_SNOOP_RECVS);
2403                         recv_mad_agent->agent.recv_handler(
2404                                                 &recv_mad_agent->agent,
2405                                                 &local->mad_priv->header.recv_wc);
2406                         spin_lock_irqsave(&recv_mad_agent->lock, flags);
2407                         atomic_dec(&recv_mad_agent->refcount);
2408                         spin_unlock_irqrestore(&recv_mad_agent->lock, flags);
2409                 }
2410
2411 local_send_completion:
2412                 /* Complete send */
2413                 mad_send_wc.status = IB_WC_SUCCESS;
2414                 mad_send_wc.vendor_err = 0;
2415                 mad_send_wc.send_buf = &local->mad_send_wr->send_buf;
2416                 if (atomic_read(&mad_agent_priv->qp_info->snoop_count))
2417                         snoop_send(mad_agent_priv->qp_info,
2418                                    &local->mad_send_wr->send_buf,
2419                                    &mad_send_wc, IB_MAD_SNOOP_SEND_COMPLETIONS);
2420                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2421                                                    &mad_send_wc);
2422
2423                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2424                 atomic_dec(&mad_agent_priv->refcount);
2425                 if (free_mad)
2426                         kmem_cache_free(ib_mad_cache, local->mad_priv);
2427                 kfree(local);
2428         }
2429         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2430 }
2431
2432 static int retry_send(struct ib_mad_send_wr_private *mad_send_wr)
2433 {
2434         int ret;
2435
2436         if (!mad_send_wr->retries_left)
2437                 return -ETIMEDOUT;
2438
2439         mad_send_wr->retries_left--;
2440         mad_send_wr->send_buf.retries++;
2441
2442         mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
2443
2444         if (mad_send_wr->mad_agent_priv->agent.rmpp_version) {
2445                 ret = ib_retry_rmpp(mad_send_wr);
2446                 switch (ret) {
2447                 case IB_RMPP_RESULT_UNHANDLED:
2448                         ret = ib_send_mad(mad_send_wr);
2449                         break;
2450                 case IB_RMPP_RESULT_CONSUMED:
2451                         ret = 0;
2452                         break;
2453                 default:
2454                         ret = -ECOMM;
2455                         break;
2456                 }
2457         } else
2458                 ret = ib_send_mad(mad_send_wr);
2459
2460         if (!ret) {
2461                 mad_send_wr->refcount++;
2462                 list_add_tail(&mad_send_wr->agent_list,
2463                               &mad_send_wr->mad_agent_priv->send_list);
2464         }
2465         return ret;
2466 }
2467
2468 static void timeout_sends(struct work_struct *work)
2469 {
2470         struct ib_mad_agent_private *mad_agent_priv;
2471         struct ib_mad_send_wr_private *mad_send_wr;
2472         struct ib_mad_send_wc mad_send_wc;
2473         unsigned long flags, delay;
2474
2475         mad_agent_priv = container_of(work, struct ib_mad_agent_private,
2476                                       timed_work.work);
2477         mad_send_wc.vendor_err = 0;
2478
2479         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2480         while (!list_empty(&mad_agent_priv->wait_list)) {
2481                 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2482                                          struct ib_mad_send_wr_private,
2483                                          agent_list);
2484
2485                 if (time_after(mad_send_wr->timeout, jiffies)) {
2486                         delay = mad_send_wr->timeout - jiffies;
2487                         if ((long)delay <= 0)
2488                                 delay = 1;
2489                         queue_delayed_work(mad_agent_priv->qp_info->
2490                                            port_priv->wq,
2491                                            &mad_agent_priv->timed_work, delay);
2492                         break;
2493                 }
2494
2495                 list_del(&mad_send_wr->agent_list);
2496                 if (mad_send_wr->status == IB_WC_SUCCESS &&
2497                     !retry_send(mad_send_wr))
2498                         continue;
2499
2500                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2501
2502                 if (mad_send_wr->status == IB_WC_SUCCESS)
2503                         mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR;
2504                 else
2505                         mad_send_wc.status = mad_send_wr->status;
2506                 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2507                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2508                                                    &mad_send_wc);
2509
2510                 atomic_dec(&mad_agent_priv->refcount);
2511                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2512         }
2513         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2514 }
2515
2516 static void ib_mad_thread_completion_handler(struct ib_cq *cq, void *arg)
2517 {
2518         struct ib_mad_port_private *port_priv = cq->cq_context;
2519         unsigned long flags;
2520
2521         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2522         if (!list_empty(&port_priv->port_list))
2523                 queue_work(port_priv->wq, &port_priv->work);
2524         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2525 }
2526
2527 /*
2528  * Allocate receive MADs and post receive WRs for them
2529  */
2530 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
2531                                     struct ib_mad_private *mad)
2532 {
2533         unsigned long flags;
2534         int post, ret;
2535         struct ib_mad_private *mad_priv;
2536         struct ib_sge sg_list;
2537         struct ib_recv_wr recv_wr, *bad_recv_wr;
2538         struct ib_mad_queue *recv_queue = &qp_info->recv_queue;
2539
2540         /* Initialize common scatter list fields */
2541         sg_list.length = sizeof *mad_priv - sizeof mad_priv->header;
2542         sg_list.lkey = (*qp_info->port_priv->mr).lkey;
2543
2544         /* Initialize common receive WR fields */
2545         recv_wr.next = NULL;
2546         recv_wr.sg_list = &sg_list;
2547         recv_wr.num_sge = 1;
2548
2549         do {
2550                 /* Allocate and map receive buffer */
2551                 if (mad) {
2552                         mad_priv = mad;
2553                         mad = NULL;
2554                 } else {
2555                         mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
2556                         if (!mad_priv) {
2557                                 printk(KERN_ERR PFX "No memory for receive buffer\n");
2558                                 ret = -ENOMEM;
2559                                 break;
2560                         }
2561                 }
2562                 sg_list.addr = ib_dma_map_single(qp_info->port_priv->device,
2563                                                  &mad_priv->grh,
2564                                                  sizeof *mad_priv -
2565                                                    sizeof mad_priv->header,
2566                                                  DMA_FROM_DEVICE);
2567                 mad_priv->header.mapping = sg_list.addr;
2568                 recv_wr.wr_id = (unsigned long)&mad_priv->header.mad_list;
2569                 mad_priv->header.mad_list.mad_queue = recv_queue;
2570
2571                 /* Post receive WR */
2572                 spin_lock_irqsave(&recv_queue->lock, flags);
2573                 post = (++recv_queue->count < recv_queue->max_active);
2574                 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list);
2575                 spin_unlock_irqrestore(&recv_queue->lock, flags);
2576                 ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr);
2577                 if (ret) {
2578                         spin_lock_irqsave(&recv_queue->lock, flags);
2579                         list_del(&mad_priv->header.mad_list.list);
2580                         recv_queue->count--;
2581                         spin_unlock_irqrestore(&recv_queue->lock, flags);
2582                         ib_dma_unmap_single(qp_info->port_priv->device,
2583                                             mad_priv->header.mapping,
2584                                             sizeof *mad_priv -
2585                                               sizeof mad_priv->header,
2586                                             DMA_FROM_DEVICE);
2587                         kmem_cache_free(ib_mad_cache, mad_priv);
2588                         printk(KERN_ERR PFX "ib_post_recv failed: %d\n", ret);
2589                         break;
2590                 }
2591         } while (post);
2592
2593         return ret;
2594 }
2595
2596 /*
2597  * Return all the posted receive MADs
2598  */
2599 static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info)
2600 {
2601         struct ib_mad_private_header *mad_priv_hdr;
2602         struct ib_mad_private *recv;
2603         struct ib_mad_list_head *mad_list;
2604
2605         while (!list_empty(&qp_info->recv_queue.list)) {
2606
2607                 mad_list = list_entry(qp_info->recv_queue.list.next,
2608                                       struct ib_mad_list_head, list);
2609                 mad_priv_hdr = container_of(mad_list,
2610                                             struct ib_mad_private_header,
2611                                             mad_list);
2612                 recv = container_of(mad_priv_hdr, struct ib_mad_private,
2613                                     header);
2614
2615                 /* Remove from posted receive MAD list */
2616                 list_del(&mad_list->list);
2617
2618                 ib_dma_unmap_single(qp_info->port_priv->device,
2619                                     recv->header.mapping,
2620                                     sizeof(struct ib_mad_private) -
2621                                       sizeof(struct ib_mad_private_header),
2622                                     DMA_FROM_DEVICE);
2623                 kmem_cache_free(ib_mad_cache, recv);
2624         }
2625
2626         qp_info->recv_queue.count = 0;
2627 }
2628
2629 /*
2630  * Start the port
2631  */
2632 static int ib_mad_port_start(struct ib_mad_port_private *port_priv)
2633 {
2634         int ret, i;
2635         struct ib_qp_attr *attr;
2636         struct ib_qp *qp;
2637
2638         attr = kmalloc(sizeof *attr, GFP_KERNEL);
2639         if (!attr) {
2640                 printk(KERN_ERR PFX "Couldn't kmalloc ib_qp_attr\n");
2641                 return -ENOMEM;
2642         }
2643
2644         for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2645                 qp = port_priv->qp_info[i].qp;
2646                 /*
2647                  * PKey index for QP1 is irrelevant but
2648                  * one is needed for the Reset to Init transition
2649                  */
2650                 attr->qp_state = IB_QPS_INIT;
2651                 attr->pkey_index = 0;
2652                 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY;
2653                 ret = ib_modify_qp(qp, attr, IB_QP_STATE |
2654                                              IB_QP_PKEY_INDEX | IB_QP_QKEY);
2655                 if (ret) {
2656                         printk(KERN_ERR PFX "Couldn't change QP%d state to "
2657                                "INIT: %d\n", i, ret);
2658                         goto out;
2659                 }
2660
2661                 attr->qp_state = IB_QPS_RTR;
2662                 ret = ib_modify_qp(qp, attr, IB_QP_STATE);
2663                 if (ret) {
2664                         printk(KERN_ERR PFX "Couldn't change QP%d state to "
2665                                "RTR: %d\n", i, ret);
2666                         goto out;
2667                 }
2668
2669                 attr->qp_state = IB_QPS_RTS;
2670                 attr->sq_psn = IB_MAD_SEND_Q_PSN;
2671                 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN);
2672                 if (ret) {
2673                         printk(KERN_ERR PFX "Couldn't change QP%d state to "
2674                                "RTS: %d\n", i, ret);
2675                         goto out;
2676                 }
2677         }
2678
2679         ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2680         if (ret) {
2681                 printk(KERN_ERR PFX "Failed to request completion "
2682                        "notification: %d\n", ret);
2683                 goto out;
2684         }
2685
2686         for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2687                 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
2688                 if (ret) {
2689                         printk(KERN_ERR PFX "Couldn't post receive WRs\n");
2690                         goto out;
2691                 }
2692         }
2693 out:
2694         kfree(attr);
2695         return ret;
2696 }
2697
2698 static void qp_event_handler(struct ib_event *event, void *qp_context)
2699 {
2700         struct ib_mad_qp_info   *qp_info = qp_context;
2701
2702         /* It's worse than that! He's dead, Jim! */
2703         printk(KERN_ERR PFX "Fatal error (%d) on MAD QP (%d)\n",
2704                 event->event, qp_info->qp->qp_num);
2705 }
2706
2707 static void init_mad_queue(struct ib_mad_qp_info *qp_info,
2708                            struct ib_mad_queue *mad_queue)
2709 {
2710         mad_queue->qp_info = qp_info;
2711         mad_queue->count = 0;
2712         spin_lock_init(&mad_queue->lock);
2713         INIT_LIST_HEAD(&mad_queue->list);
2714 }
2715
2716 static void init_mad_qp(struct ib_mad_port_private *port_priv,
2717                         struct ib_mad_qp_info *qp_info)
2718 {
2719         qp_info->port_priv = port_priv;
2720         init_mad_queue(qp_info, &qp_info->send_queue);
2721         init_mad_queue(qp_info, &qp_info->recv_queue);
2722         INIT_LIST_HEAD(&qp_info->overflow_list);
2723         spin_lock_init(&qp_info->snoop_lock);
2724         qp_info->snoop_table = NULL;
2725         qp_info->snoop_table_size = 0;
2726         atomic_set(&qp_info->snoop_count, 0);
2727 }
2728
2729 static int create_mad_qp(struct ib_mad_qp_info *qp_info,
2730                          enum ib_qp_type qp_type)
2731 {
2732         struct ib_qp_init_attr  qp_init_attr;
2733         int ret;
2734
2735         memset(&qp_init_attr, 0, sizeof qp_init_attr);
2736         qp_init_attr.send_cq = qp_info->port_priv->cq;
2737         qp_init_attr.recv_cq = qp_info->port_priv->cq;
2738         qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
2739         qp_init_attr.cap.max_send_wr = IB_MAD_QP_SEND_SIZE;
2740         qp_init_attr.cap.max_recv_wr = IB_MAD_QP_RECV_SIZE;
2741         qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG;
2742         qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG;
2743         qp_init_attr.qp_type = qp_type;
2744         qp_init_attr.port_num = qp_info->port_priv->port_num;
2745         qp_init_attr.qp_context = qp_info;
2746         qp_init_attr.event_handler = qp_event_handler;
2747         qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr);
2748         if (IS_ERR(qp_info->qp)) {
2749                 printk(KERN_ERR PFX "Couldn't create ib_mad QP%d\n",
2750                        get_spl_qp_index(qp_type));
2751                 ret = PTR_ERR(qp_info->qp);
2752                 goto error;
2753         }
2754         /* Use minimum queue sizes unless the CQ is resized */
2755         qp_info->send_queue.max_active = IB_MAD_QP_SEND_SIZE;
2756         qp_info->recv_queue.max_active = IB_MAD_QP_RECV_SIZE;
2757         return 0;
2758
2759 error:
2760         return ret;
2761 }
2762
2763 static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
2764 {
2765         ib_destroy_qp(qp_info->qp);
2766         kfree(qp_info->snoop_table);
2767 }
2768
2769 /*
2770  * Open the port
2771  * Create the QP, PD, MR, and CQ if needed
2772  */
2773 static int ib_mad_port_open(struct ib_device *device,
2774                             int port_num)
2775 {
2776         int ret, cq_size;
2777         struct ib_mad_port_private *port_priv;
2778         unsigned long flags;
2779         char name[sizeof "ib_mad123"];
2780
2781         /* Create new device info */
2782         port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
2783         if (!port_priv) {
2784                 printk(KERN_ERR PFX "No memory for ib_mad_port_private\n");
2785                 return -ENOMEM;
2786         }
2787
2788         port_priv->device = device;
2789         port_priv->port_num = port_num;
2790         spin_lock_init(&port_priv->reg_lock);
2791         INIT_LIST_HEAD(&port_priv->agent_list);
2792         init_mad_qp(port_priv, &port_priv->qp_info[0]);
2793         init_mad_qp(port_priv, &port_priv->qp_info[1]);
2794
2795         cq_size = (IB_MAD_QP_SEND_SIZE + IB_MAD_QP_RECV_SIZE) * 2;
2796         port_priv->cq = ib_create_cq(port_priv->device,
2797                                      ib_mad_thread_completion_handler,
2798                                      NULL, port_priv, cq_size, 0);
2799         if (IS_ERR(port_priv->cq)) {
2800                 printk(KERN_ERR PFX "Couldn't create ib_mad CQ\n");
2801                 ret = PTR_ERR(port_priv->cq);
2802                 goto error3;
2803         }
2804
2805         port_priv->pd = ib_alloc_pd(device);
2806         if (IS_ERR(port_priv->pd)) {
2807                 printk(KERN_ERR PFX "Couldn't create ib_mad PD\n");
2808                 ret = PTR_ERR(port_priv->pd);
2809                 goto error4;
2810         }
2811
2812         port_priv->mr = ib_get_dma_mr(port_priv->pd, IB_ACCESS_LOCAL_WRITE);
2813         if (IS_ERR(port_priv->mr)) {
2814                 printk(KERN_ERR PFX "Couldn't get ib_mad DMA MR\n");
2815                 ret = PTR_ERR(port_priv->mr);
2816                 goto error5;
2817         }
2818
2819         ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
2820         if (ret)
2821                 goto error6;
2822         ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI);
2823         if (ret)
2824                 goto error7;
2825
2826         snprintf(name, sizeof name, "ib_mad%d", port_num);
2827         port_priv->wq = create_singlethread_workqueue(name);
2828         if (!port_priv->wq) {
2829                 ret = -ENOMEM;
2830                 goto error8;
2831         }
2832         INIT_WORK(&port_priv->work, ib_mad_completion_handler);
2833
2834         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2835         list_add_tail(&port_priv->port_list, &ib_mad_port_list);
2836         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2837
2838         ret = ib_mad_port_start(port_priv);
2839         if (ret) {
2840                 printk(KERN_ERR PFX "Couldn't start port\n");
2841                 goto error9;
2842         }
2843
2844         return 0;
2845
2846 error9:
2847         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2848         list_del_init(&port_priv->port_list);
2849         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2850
2851         destroy_workqueue(port_priv->wq);
2852 error8:
2853         destroy_mad_qp(&port_priv->qp_info[1]);
2854 error7:
2855         destroy_mad_qp(&port_priv->qp_info[0]);
2856 error6:
2857         ib_dereg_mr(port_priv->mr);
2858 error5:
2859         ib_dealloc_pd(port_priv->pd);
2860 error4:
2861         ib_destroy_cq(port_priv->cq);
2862         cleanup_recv_queue(&port_priv->qp_info[1]);
2863         cleanup_recv_queue(&port_priv->qp_info[0]);
2864 error3:
2865         kfree(port_priv);
2866
2867         return ret;
2868 }
2869
2870 /*
2871  * Close the port
2872  * If there are no classes using the port, free the port
2873  * resources (CQ, MR, PD, QP) and remove the port's info structure
2874  */
2875 static int ib_mad_port_close(struct ib_device *device, int port_num)
2876 {
2877         struct ib_mad_port_private *port_priv;
2878         unsigned long flags;
2879
2880         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2881         port_priv = __ib_get_mad_port(device, port_num);
2882         if (port_priv == NULL) {
2883                 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2884                 printk(KERN_ERR PFX "Port %d not found\n", port_num);
2885                 return -ENODEV;
2886         }
2887         list_del_init(&port_priv->port_list);
2888         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2889
2890         destroy_workqueue(port_priv->wq);
2891         destroy_mad_qp(&port_priv->qp_info[1]);
2892         destroy_mad_qp(&port_priv->qp_info[0]);
2893         ib_dereg_mr(port_priv->mr);
2894         ib_dealloc_pd(port_priv->pd);
2895         ib_destroy_cq(port_priv->cq);
2896         cleanup_recv_queue(&port_priv->qp_info[1]);
2897         cleanup_recv_queue(&port_priv->qp_info[0]);
2898         /* XXX: Handle deallocation of MAD registration tables */
2899
2900         kfree(port_priv);
2901
2902         return 0;
2903 }
2904
2905 static void ib_mad_init_device(struct ib_device *device)
2906 {
2907         int start, end, i;
2908
2909         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
2910                 return;
2911
2912         if (device->node_type == RDMA_NODE_IB_SWITCH) {
2913                 start = 0;
2914                 end   = 0;
2915         } else {
2916                 start = 1;
2917                 end   = device->phys_port_cnt;
2918         }
2919
2920         for (i = start; i <= end; i++) {
2921                 if (ib_mad_port_open(device, i)) {
2922                         printk(KERN_ERR PFX "Couldn't open %s port %d\n",
2923                                device->name, i);
2924                         goto error;
2925                 }
2926                 if (ib_agent_port_open(device, i)) {
2927                         printk(KERN_ERR PFX "Couldn't open %s port %d "
2928                                "for agents\n",
2929                                device->name, i);
2930                         goto error_agent;
2931                 }
2932         }
2933         return;
2934
2935 error_agent:
2936         if (ib_mad_port_close(device, i))
2937                 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2938                        device->name, i);
2939
2940 error:
2941         i--;
2942
2943         while (i >= start) {
2944                 if (ib_agent_port_close(device, i))
2945                         printk(KERN_ERR PFX "Couldn't close %s port %d "
2946                                "for agents\n",
2947                                device->name, i);
2948                 if (ib_mad_port_close(device, i))
2949                         printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2950                                device->name, i);
2951                 i--;
2952         }
2953 }
2954
2955 static void ib_mad_remove_device(struct ib_device *device)
2956 {
2957         int i, num_ports, cur_port;
2958
2959         if (device->node_type == RDMA_NODE_IB_SWITCH) {
2960                 num_ports = 1;
2961                 cur_port = 0;
2962         } else {
2963                 num_ports = device->phys_port_cnt;
2964                 cur_port = 1;
2965         }
2966         for (i = 0; i < num_ports; i++, cur_port++) {
2967                 if (ib_agent_port_close(device, cur_port))
2968                         printk(KERN_ERR PFX "Couldn't close %s port %d "
2969                                "for agents\n",
2970                                device->name, cur_port);
2971                 if (ib_mad_port_close(device, cur_port))
2972                         printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2973                                device->name, cur_port);
2974         }
2975 }
2976
2977 static struct ib_client mad_client = {
2978         .name   = "mad",
2979         .add = ib_mad_init_device,
2980         .remove = ib_mad_remove_device
2981 };
2982
2983 static int __init ib_mad_init_module(void)
2984 {
2985         int ret;
2986
2987         spin_lock_init(&ib_mad_port_list_lock);
2988
2989         ib_mad_cache = kmem_cache_create("ib_mad",
2990                                          sizeof(struct ib_mad_private),
2991                                          0,
2992                                          SLAB_HWCACHE_ALIGN,
2993                                          NULL);
2994         if (!ib_mad_cache) {
2995                 printk(KERN_ERR PFX "Couldn't create ib_mad cache\n");
2996                 ret = -ENOMEM;
2997                 goto error1;
2998         }
2999
3000         INIT_LIST_HEAD(&ib_mad_port_list);
3001
3002         if (ib_register_client(&mad_client)) {
3003                 printk(KERN_ERR PFX "Couldn't register ib_mad client\n");
3004                 ret = -EINVAL;
3005                 goto error2;
3006         }
3007
3008         return 0;
3009
3010 error2:
3011         kmem_cache_destroy(ib_mad_cache);
3012 error1:
3013         return ret;
3014 }
3015
3016 static void __exit ib_mad_cleanup_module(void)
3017 {
3018         ib_unregister_client(&mad_client);
3019         kmem_cache_destroy(ib_mad_cache);
3020 }
3021
3022 module_init(ib_mad_init_module);
3023 module_exit(ib_mad_cleanup_module);
3024