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
 305         spin_lock_irqsave(&port_priv->reg_lock, flags);
 306         mad_agent_priv->agent.hi_tid = ++ib_mad_client_id;
 307
 308         /*
 309          * Make sure MAD registration (if supplied)
 310          * is non overlapping with any existing ones
 311          */
 312         if (mad_reg_req) {
 313                 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class);
 314                 if (!is_vendor_class(mgmt_class)) {
 315                         class = port_priv->version[mad_reg_req->
 316                                                    mgmt_class_version].class;
 317                         if (class) {
 318                                 method = class->method_table[mgmt_class];
 319                                 if (method) {
 320                                         if (method_in_use(&method,
 321                                                            mad_reg_req))
 322                                                 goto error4;
 323                                 }
 324                         }
 325                         ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv,
 326                                                   mgmt_class);
 327                 } else {
 328                         /* "New" vendor class range */
 329                         vendor = port_priv->version[mad_reg_req->
 330                                                     mgmt_class_version].vendor;
 331                         if (vendor) {
 332                                 vclass = vendor_class_index(mgmt_class);
 333                                 vendor_class = vendor->vendor_class[vclass];
 334                                 if (vendor_class) {
 335                                         if (is_vendor_method_in_use(
 336                                                         vendor_class,
 337                                                         mad_reg_req))
 338                                                 goto error4;
 339                                 }
 340                         }
 341                         ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv);
 342                 }
 343                 if (ret2) {
 344                         ret = ERR_PTR(ret2);
 345                         goto error4;
 346                 }
 347         }
 348
 349         /* Add mad agent into port's agent list */
 350         list_add_tail(&mad_agent_priv->agent_list, &port_priv->agent_list);
 351         spin_unlock_irqrestore(&port_priv->reg_lock, flags);
 352
 353         spin_lock_init(&mad_agent_priv->lock);
 354         INIT_LIST_HEAD(&mad_agent_priv->send_list);
 355         INIT_LIST_HEAD(&mad_agent_priv->wait_list);
 356         INIT_LIST_HEAD(&mad_agent_priv->done_list);
 357         INIT_LIST_HEAD(&mad_agent_priv->rmpp_list);
 358         INIT_DELAYED_WORK(&mad_agent_priv->timed_work, timeout_sends);
 359         INIT_LIST_HEAD(&mad_agent_priv->local_list);
 360         INIT_WORK(&mad_agent_priv->local_work, local_completions);
 361         atomic_set(&mad_agent_priv->refcount, 1);
 362         init_completion(&mad_agent_priv->comp);
 363
 364         return &mad_agent_priv->agent;
 365
 366 error4:
 367         spin_unlock_irqrestore(&port_priv->reg_lock, flags);
 368         kfree(reg_req);
 369 error3:
 370         ib_dereg_mr(mad_agent_priv->agent.mr);
 371 error2:
 372         kfree(mad_agent_priv);
 373 error1:
 374         return ret;
 375 }
 376 EXPORT_SYMBOL(ib_register_mad_agent);
 377
 378 static inline int is_snooping_sends(int mad_snoop_flags)
 379 {
 380         return (mad_snoop_flags &
 381                 (/*IB_MAD_SNOOP_POSTED_SENDS |
 382                  IB_MAD_SNOOP_RMPP_SENDS |*/
 383                  IB_MAD_SNOOP_SEND_COMPLETIONS /*|
 384                  IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS*/));
 385 }
 386
 387 static inline int is_snooping_recvs(int mad_snoop_flags)
 388 {
 389         return (mad_snoop_flags &
 390                 (IB_MAD_SNOOP_RECVS /*|
 391                  IB_MAD_SNOOP_RMPP_RECVS*/));
 392 }
 393
 394 static int register_snoop_agent(struct ib_mad_qp_info *qp_info,
 395                                 struct ib_mad_snoop_private *mad_snoop_priv)
 396 {
 397         struct ib_mad_snoop_private **new_snoop_table;
 398         unsigned long flags;
 399         int i;
 400
 401         spin_lock_irqsave(&qp_info->snoop_lock, flags);
 402         /* Check for empty slot in array. */
 403         for (i = 0; i < qp_info->snoop_table_size; i++)
 404                 if (!qp_info->snoop_table[i])
 405                         break;
 406
 407         if (i == qp_info->snoop_table_size) {
 408                 /* Grow table. */
 409                 new_snoop_table = kmalloc(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                 if (qp_info->snoop_table) {
 417                         memcpy(new_snoop_table, qp_info->snoop_table,
 418                                sizeof mad_snoop_priv *
 419                                qp_info->snoop_table_size);
 420                         kfree(qp_info->snoop_table);
 421                 }
 422                 qp_info->snoop_table = new_snoop_table;
 423                 qp_info->snoop_table_size++;
 424         }
 425         qp_info->snoop_table[i] = mad_snoop_priv;
 426         atomic_inc(&qp_info->snoop_count);
 427 out:
 428         spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 429         return i;
 430 }
 431
 432 struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device,
 433                                            u8 port_num,
 434                                            enum ib_qp_type qp_type,
 435                                            int mad_snoop_flags,
 436                                            ib_mad_snoop_handler snoop_handler,
 437                                            ib_mad_recv_handler recv_handler,
 438                                            void *context)
 439 {
 440         struct ib_mad_port_private *port_priv;
 441         struct ib_mad_agent *ret;
 442         struct ib_mad_snoop_private *mad_snoop_priv;
 443         int qpn;
 444
 445         /* Validate parameters */
 446         if ((is_snooping_sends(mad_snoop_flags) && !snoop_handler) ||
 447             (is_snooping_recvs(mad_snoop_flags) && !recv_handler)) {
 448                 ret = ERR_PTR(-EINVAL);
 449                 goto error1;
 450         }
 451         qpn = get_spl_qp_index(qp_type);
 452         if (qpn == -1) {
 453                 ret = ERR_PTR(-EINVAL);
 454                 goto error1;
 455         }
 456         port_priv = ib_get_mad_port(device, port_num);
 457         if (!port_priv) {
 458                 ret = ERR_PTR(-ENODEV);
 459                 goto error1;
 460         }
 461         /* Allocate structures */
 462         mad_snoop_priv = kzalloc(sizeof *mad_snoop_priv, GFP_KERNEL);
 463         if (!mad_snoop_priv) {
 464                 ret = ERR_PTR(-ENOMEM);
 465                 goto error1;
 466         }
 467
 468         /* Now, fill in the various structures */
 469         mad_snoop_priv->qp_info = &port_priv->qp_info[qpn];
 470         mad_snoop_priv->agent.device = device;
 471         mad_snoop_priv->agent.recv_handler = recv_handler;
 472         mad_snoop_priv->agent.snoop_handler = snoop_handler;
 473         mad_snoop_priv->agent.context = context;
 474         mad_snoop_priv->agent.qp = port_priv->qp_info[qpn].qp;
 475         mad_snoop_priv->agent.port_num = port_num;
 476         mad_snoop_priv->mad_snoop_flags = mad_snoop_flags;
 477         init_completion(&mad_snoop_priv->comp);
 478         mad_snoop_priv->snoop_index = register_snoop_agent(
 479                                                 &port_priv->qp_info[qpn],
 480                                                 mad_snoop_priv);
 481         if (mad_snoop_priv->snoop_index < 0) {
 482                 ret = ERR_PTR(mad_snoop_priv->snoop_index);
 483                 goto error2;
 484         }
 485
 486         atomic_set(&mad_snoop_priv->refcount, 1);
 487         return &mad_snoop_priv->agent;
 488
 489 error2:
 490         kfree(mad_snoop_priv);
 491 error1:
 492         return ret;
 493 }
 494 EXPORT_SYMBOL(ib_register_mad_snoop);
 495
 496 static inline void deref_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
 497 {
 498         if (atomic_dec_and_test(&mad_agent_priv->refcount))
 499                 complete(&mad_agent_priv->comp);
 500 }
 501
 502 static inline void deref_snoop_agent(struct ib_mad_snoop_private *mad_snoop_priv)
 503 {
 504         if (atomic_dec_and_test(&mad_snoop_priv->refcount))
 505                 complete(&mad_snoop_priv->comp);
 506 }
 507
 508 static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
 509 {
 510         struct ib_mad_port_private *port_priv;
 511         unsigned long flags;
 512
 513         /* Note that we could still be handling received MADs */
 514
 515         /*
 516          * Canceling all sends results in dropping received response
 517          * MADs, preventing us from queuing additional work
 518          */
 519         cancel_mads(mad_agent_priv);
 520         port_priv = mad_agent_priv->qp_info->port_priv;
 521         cancel_delayed_work(&mad_agent_priv->timed_work);
 522
 523         spin_lock_irqsave(&port_priv->reg_lock, flags);
 524         remove_mad_reg_req(mad_agent_priv);
 525         list_del(&mad_agent_priv->agent_list);
 526         spin_unlock_irqrestore(&port_priv->reg_lock, flags);
 527
 528         flush_workqueue(port_priv->wq);
 529         ib_cancel_rmpp_recvs(mad_agent_priv);
 530
 531         deref_mad_agent(mad_agent_priv);
 532         wait_for_completion(&mad_agent_priv->comp);
 533
 534         kfree(mad_agent_priv->reg_req);
 535         ib_dereg_mr(mad_agent_priv->agent.mr);
 536         kfree(mad_agent_priv);
 537 }
 538
 539 static void unregister_mad_snoop(struct ib_mad_snoop_private *mad_snoop_priv)
 540 {
 541         struct ib_mad_qp_info *qp_info;
 542         unsigned long flags;
 543
 544         qp_info = mad_snoop_priv->qp_info;
 545         spin_lock_irqsave(&qp_info->snoop_lock, flags);
 546         qp_info->snoop_table[mad_snoop_priv->snoop_index] = NULL;
 547         atomic_dec(&qp_info->snoop_count);
 548         spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 549
 550         deref_snoop_agent(mad_snoop_priv);
 551         wait_for_completion(&mad_snoop_priv->comp);
 552
 553         kfree(mad_snoop_priv);
 554 }
 555
 556 /*
 557  * ib_unregister_mad_agent - Unregisters a client from using MAD services
 558  */
 559 int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent)
 560 {
 561         struct ib_mad_agent_private *mad_agent_priv;
 562         struct ib_mad_snoop_private *mad_snoop_priv;
 563
 564         /* If the TID is zero, the agent can only snoop. */
 565         if (mad_agent->hi_tid) {
 566                 mad_agent_priv = container_of(mad_agent,
 567                                               struct ib_mad_agent_private,
 568                                               agent);
 569                 unregister_mad_agent(mad_agent_priv);
 570         } else {
 571                 mad_snoop_priv = container_of(mad_agent,
 572                                               struct ib_mad_snoop_private,
 573                                               agent);
 574                 unregister_mad_snoop(mad_snoop_priv);
 575         }
 576         return 0;
 577 }
 578 EXPORT_SYMBOL(ib_unregister_mad_agent);
 579
 580 static void dequeue_mad(struct ib_mad_list_head *mad_list)
 581 {
 582         struct ib_mad_queue *mad_queue;
 583         unsigned long flags;
 584
 585         BUG_ON(!mad_list->mad_queue);
 586         mad_queue = mad_list->mad_queue;
 587         spin_lock_irqsave(&mad_queue->lock, flags);
 588         list_del(&mad_list->list);
 589         mad_queue->count--;
 590         spin_unlock_irqrestore(&mad_queue->lock, flags);
 591 }
 592
 593 static void snoop_send(struct ib_mad_qp_info *qp_info,
 594                        struct ib_mad_send_buf *send_buf,
 595                        struct ib_mad_send_wc *mad_send_wc,
 596                        int mad_snoop_flags)
 597 {
 598         struct ib_mad_snoop_private *mad_snoop_priv;
 599         unsigned long flags;
 600         int i;
 601
 602         spin_lock_irqsave(&qp_info->snoop_lock, flags);
 603         for (i = 0; i < qp_info->snoop_table_size; i++) {
 604                 mad_snoop_priv = qp_info->snoop_table[i];
 605                 if (!mad_snoop_priv ||
 606                     !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
 607                         continue;
 608
 609                 atomic_inc(&mad_snoop_priv->refcount);
 610                 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 611                 mad_snoop_priv->agent.snoop_handler(&mad_snoop_priv->agent,
 612                                                     send_buf, mad_send_wc);
 613                 deref_snoop_agent(mad_snoop_priv);
 614                 spin_lock_irqsave(&qp_info->snoop_lock, flags);
 615         }
 616         spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 617 }
 618
 619 static void snoop_recv(struct ib_mad_qp_info *qp_info,
 620                        struct ib_mad_recv_wc *mad_recv_wc,
 621                        int mad_snoop_flags)
 622 {
 623         struct ib_mad_snoop_private *mad_snoop_priv;
 624         unsigned long flags;
 625         int i;
 626
 627         spin_lock_irqsave(&qp_info->snoop_lock, flags);
 628         for (i = 0; i < qp_info->snoop_table_size; i++) {
 629                 mad_snoop_priv = qp_info->snoop_table[i];
 630                 if (!mad_snoop_priv ||
 631                     !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
 632                         continue;
 633
 634                 atomic_inc(&mad_snoop_priv->refcount);
 635                 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 636                 mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent,
 637                                                    mad_recv_wc);
 638                 deref_snoop_agent(mad_snoop_priv);
 639                 spin_lock_irqsave(&qp_info->snoop_lock, flags);
 640         }
 641         spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 642 }
 643
 644 static void build_smp_wc(struct ib_qp *qp,
 645                          u64 wr_id, u16 slid, u16 pkey_index, u8 port_num,
 646                          struct ib_wc *wc)
 647 {
 648         memset(wc, 0, sizeof *wc);
 649         wc->wr_id = wr_id;
 650         wc->status = IB_WC_SUCCESS;
 651         wc->opcode = IB_WC_RECV;
 652         wc->pkey_index = pkey_index;
 653         wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh);
 654         wc->src_qp = IB_QP0;
 655         wc->qp = qp;
 656         wc->slid = slid;
 657         wc->sl = 0;
 658         wc->dlid_path_bits = 0;
 659         wc->port_num = port_num;
 660 }
 661
 662 /*
 663  * Return 0 if SMP is to be sent
 664  * Return 1 if SMP was consumed locally (whether or not solicited)
 665  * Return < 0 if error
 666  */
 667 static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv,
 668                                   struct ib_mad_send_wr_private *mad_send_wr)
 669 {
 670         int ret = 0;
 671         struct ib_smp *smp = mad_send_wr->send_buf.mad;
 672         unsigned long flags;
 673         struct ib_mad_local_private *local;
 674         struct ib_mad_private *mad_priv;
 675         struct ib_mad_port_private *port_priv;
 676         struct ib_mad_agent_private *recv_mad_agent = NULL;
 677         struct ib_device *device = mad_agent_priv->agent.device;
 678         u8 port_num;
 679         struct ib_wc mad_wc;
 680         struct ib_send_wr *send_wr = &mad_send_wr->send_wr;
 681
 682         if (device->node_type == RDMA_NODE_IB_SWITCH &&
 683             smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
 684                 port_num = send_wr->wr.ud.port_num;
 685         else
 686                 port_num = mad_agent_priv->agent.port_num;
 687
 688         /*
 689          * Directed route handling starts if the initial LID routed part of
 690          * a request or the ending LID routed part of a response is empty.
 691          * If we are at the start of the LID routed part, don't update the
 692          * hop_ptr or hop_cnt.  See section 14.2.2, Vol 1 IB spec.
 693          */
 694         if ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) ==
 695              IB_LID_PERMISSIVE &&
 696              smi_handle_dr_smp_send(smp, device->node_type, port_num) ==
 697              IB_SMI_DISCARD) {
 698                 ret = -EINVAL;
 699                 printk(KERN_ERR PFX "Invalid directed route\n");
 700                 goto out;
 701         }
 702
 703         /* Check to post send on QP or process locally */
 704         if (smi_check_local_smp(smp, device) == IB_SMI_DISCARD &&
 705             smi_check_local_returning_smp(smp, device) == IB_SMI_DISCARD)
 706                 goto out;
 707
 708         local = kmalloc(sizeof *local, GFP_ATOMIC);
 709         if (!local) {
 710                 ret = -ENOMEM;
 711                 printk(KERN_ERR PFX "No memory for ib_mad_local_private\n");
 712                 goto out;
 713         }
 714         local->mad_priv = NULL;
 715         local->recv_mad_agent = NULL;
 716         mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_ATOMIC);
 717         if (!mad_priv) {
 718                 ret = -ENOMEM;
 719                 printk(KERN_ERR PFX "No memory for local response MAD\n");
 720                 kfree(local);
 721                 goto out;
 722         }
 723
 724         build_smp_wc(mad_agent_priv->agent.qp,
 725                      send_wr->wr_id, be16_to_cpu(smp->dr_slid),
 726                      send_wr->wr.ud.pkey_index,
 727                      send_wr->wr.ud.port_num, &mad_wc);
 728
 729         /* No GRH for DR SMP */
 730         ret = device->process_mad(device, 0, port_num, &mad_wc, NULL,
 731                                   (struct ib_mad *)smp,
 732                                   (struct ib_mad *)&mad_priv->mad);
 733         switch (ret)
 734         {
 735         case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
 736                 if (ib_response_mad(&mad_priv->mad.mad) &&
 737                     mad_agent_priv->agent.recv_handler) {
 738                         local->mad_priv = mad_priv;
 739                         local->recv_mad_agent = mad_agent_priv;
 740                         /*
 741                          * Reference MAD agent until receive
 742                          * side of local completion handled
 743                          */
 744                         atomic_inc(&mad_agent_priv->refcount);
 745                 } else
 746                         kmem_cache_free(ib_mad_cache, mad_priv);
 747                 break;
 748         case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
 749                 kmem_cache_free(ib_mad_cache, mad_priv);
 750                 kfree(local);
 751                 ret = 1;
 752                 goto out;
 753         case IB_MAD_RESULT_SUCCESS:
 754                 /* Treat like an incoming receive MAD */
 755                 port_priv = ib_get_mad_port(mad_agent_priv->agent.device,
 756                                             mad_agent_priv->agent.port_num);
 757                 if (port_priv) {
 758                         memcpy(&mad_priv->mad.mad, smp, sizeof(struct ib_mad));
 759                         recv_mad_agent = find_mad_agent(port_priv,
 760                                                         &mad_priv->mad.mad);
 761                 }
 762                 if (!port_priv || !recv_mad_agent) {
 763                         kmem_cache_free(ib_mad_cache, mad_priv);
 764                         kfree(local);
 765                         ret = 0;
 766                         goto out;
 767                 }
 768                 local->mad_priv = mad_priv;
 769                 local->recv_mad_agent = recv_mad_agent;
 770                 break;
 771         default:
 772                 kmem_cache_free(ib_mad_cache, mad_priv);
 773                 kfree(local);
 774                 ret = -EINVAL;
 775                 goto out;
 776         }
 777
 778         local->mad_send_wr = mad_send_wr;
 779         /* Reference MAD agent until send side of local completion handled */
 780         atomic_inc(&mad_agent_priv->refcount);
 781         /* Queue local completion to local list */
 782         spin_lock_irqsave(&mad_agent_priv->lock, flags);
 783         list_add_tail(&local->completion_list, &mad_agent_priv->local_list);
 784         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
 785         queue_work(mad_agent_priv->qp_info->port_priv->wq,
 786                    &mad_agent_priv->local_work);
 787         ret = 1;
 788 out:
 789         return ret;
 790 }
 791
 792 static int get_pad_size(int hdr_len, int data_len)
 793 {
 794         int seg_size, pad;
 795
 796         seg_size = sizeof(struct ib_mad) - hdr_len;
 797         if (data_len && seg_size) {
 798                 pad = seg_size - data_len % seg_size;
 799                 return pad == seg_size ? 0 : pad;
 800         } else
 801                 return seg_size;
 802 }
 803
 804 static void free_send_rmpp_list(struct ib_mad_send_wr_private *mad_send_wr)
 805 {
 806         struct ib_rmpp_segment *s, *t;
 807
 808         list_for_each_entry_safe(s, t, &mad_send_wr->rmpp_list, list) {
 809                 list_del(&s->list);
 810                 kfree(s);
 811         }
 812 }
 813
 814 static int alloc_send_rmpp_list(struct ib_mad_send_wr_private *send_wr,
 815                                 gfp_t gfp_mask)
 816 {
 817         struct ib_mad_send_buf *send_buf = &send_wr->send_buf;
 818         struct ib_rmpp_mad *rmpp_mad = send_buf->mad;
 819         struct ib_rmpp_segment *seg = NULL;
 820         int left, seg_size, pad;
 821
 822         send_buf->seg_size = sizeof (struct ib_mad) - send_buf->hdr_len;
 823         seg_size = send_buf->seg_size;
 824         pad = send_wr->pad;
 825
 826         /* Allocate data segments. */
 827         for (left = send_buf->data_len + pad; left > 0; left -= seg_size) {
 828                 seg = kmalloc(sizeof (*seg) + seg_size, gfp_mask);
 829                 if (!seg) {
 830                         printk(KERN_ERR "alloc_send_rmpp_segs: RMPP mem "
 831                                "alloc failed for len %zd, gfp %#x\n",
 832                                sizeof (*seg) + seg_size, gfp_mask);
 833                         free_send_rmpp_list(send_wr);
 834                         return -ENOMEM;
 835                 }
 836                 seg->num = ++send_buf->seg_count;
 837                 list_add_tail(&seg->list, &send_wr->rmpp_list);
 838         }
 839
 840         /* Zero any padding */
 841         if (pad)
 842                 memset(seg->data + seg_size - pad, 0, pad);
 843
 844         rmpp_mad->rmpp_hdr.rmpp_version = send_wr->mad_agent_priv->
 845                                           agent.rmpp_version;
 846         rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA;
 847         ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
 848
 849         send_wr->cur_seg = container_of(send_wr->rmpp_list.next,
 850                                         struct ib_rmpp_segment, list);
 851         send_wr->last_ack_seg = send_wr->cur_seg;
 852         return 0;
 853 }
 854
 855 struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
 856                                             u32 remote_qpn, u16 pkey_index,
 857                                             int rmpp_active,
 858                                             int hdr_len, int data_len,
 859                                             gfp_t gfp_mask)
 860 {
 861         struct ib_mad_agent_private *mad_agent_priv;
 862         struct ib_mad_send_wr_private *mad_send_wr;
 863         int pad, message_size, ret, size;
 864         void *buf;
 865
 866         mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
 867                                       agent);
 868         pad = get_pad_size(hdr_len, data_len);
 869         message_size = hdr_len + data_len + pad;
 870
 871         if ((!mad_agent->rmpp_version &&
 872              (rmpp_active || message_size > sizeof(struct ib_mad))) ||
 873             (!rmpp_active && message_size > sizeof(struct ib_mad)))
 874                 return ERR_PTR(-EINVAL);
 875
 876         size = rmpp_active ? hdr_len : sizeof(struct ib_mad);
 877         buf = kzalloc(sizeof *mad_send_wr + size, gfp_mask);
 878         if (!buf)
 879                 return ERR_PTR(-ENOMEM);
 880
 881         mad_send_wr = buf + size;
 882         INIT_LIST_HEAD(&mad_send_wr->rmpp_list);
 883         mad_send_wr->send_buf.mad = buf;
 884         mad_send_wr->send_buf.hdr_len = hdr_len;
 885         mad_send_wr->send_buf.data_len = data_len;
 886         mad_send_wr->pad = pad;
 887
 888         mad_send_wr->mad_agent_priv = mad_agent_priv;
 889         mad_send_wr->sg_list[0].length = hdr_len;
 890         mad_send_wr->sg_list[0].lkey = mad_agent->mr->lkey;
 891         mad_send_wr->sg_list[1].length = sizeof(struct ib_mad) - hdr_len;
 892         mad_send_wr->sg_list[1].lkey = mad_agent->mr->lkey;
 893
 894         mad_send_wr->send_wr.wr_id = (unsigned long) mad_send_wr;
 895         mad_send_wr->send_wr.sg_list = mad_send_wr->sg_list;
 896         mad_send_wr->send_wr.num_sge = 2;
 897         mad_send_wr->send_wr.opcode = IB_WR_SEND;
 898         mad_send_wr->send_wr.send_flags = IB_SEND_SIGNALED;
 899         mad_send_wr->send_wr.wr.ud.remote_qpn = remote_qpn;
 900         mad_send_wr->send_wr.wr.ud.remote_qkey = IB_QP_SET_QKEY;
 901         mad_send_wr->send_wr.wr.ud.pkey_index = pkey_index;
 902
 903         if (rmpp_active) {
 904                 ret = alloc_send_rmpp_list(mad_send_wr, gfp_mask);
 905                 if (ret) {
 906                         kfree(buf);
 907                         return ERR_PTR(ret);
 908                 }
 909         }
 910
 911         mad_send_wr->send_buf.mad_agent = mad_agent;
 912         atomic_inc(&mad_agent_priv->refcount);
 913         return &mad_send_wr->send_buf;
 914 }
 915 EXPORT_SYMBOL(ib_create_send_mad);
 916
 917 int ib_get_mad_data_offset(u8 mgmt_class)
 918 {
 919         if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM)
 920                 return IB_MGMT_SA_HDR;
 921         else if ((mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
 922                  (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
 923                  (mgmt_class == IB_MGMT_CLASS_BIS))
 924                 return IB_MGMT_DEVICE_HDR;
 925         else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
 926                  (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))
 927                 return IB_MGMT_VENDOR_HDR;
 928         else
 929                 return IB_MGMT_MAD_HDR;
 930 }
 931 EXPORT_SYMBOL(ib_get_mad_data_offset);
 932
 933 int ib_is_mad_class_rmpp(u8 mgmt_class)
 934 {
 935         if ((mgmt_class == IB_MGMT_CLASS_SUBN_ADM) ||
 936             (mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
 937             (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
 938             (mgmt_class == IB_MGMT_CLASS_BIS) ||
 939             ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
 940              (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)))
 941                 return 1;
 942         return 0;
 943 }
 944 EXPORT_SYMBOL(ib_is_mad_class_rmpp);
 945
 946 void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num)
 947 {
 948         struct ib_mad_send_wr_private *mad_send_wr;
 949         struct list_head *list;
 950
 951         mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
 952                                    send_buf);
 953         list = &mad_send_wr->cur_seg->list;
 954
 955         if (mad_send_wr->cur_seg->num < seg_num) {
 956                 list_for_each_entry(mad_send_wr->cur_seg, list, list)
 957                         if (mad_send_wr->cur_seg->num == seg_num)
 958                                 break;
 959         } else if (mad_send_wr->cur_seg->num > seg_num) {
 960                 list_for_each_entry_reverse(mad_send_wr->cur_seg, list, list)
 961                         if (mad_send_wr->cur_seg->num == seg_num)
 962                                 break;
 963         }
 964         return mad_send_wr->cur_seg->data;
 965 }
 966 EXPORT_SYMBOL(ib_get_rmpp_segment);
 967
 968 static inline void *ib_get_payload(struct ib_mad_send_wr_private *mad_send_wr)
 969 {
 970         if (mad_send_wr->send_buf.seg_count)
 971                 return ib_get_rmpp_segment(&mad_send_wr->send_buf,
 972                                            mad_send_wr->seg_num);
 973         else
 974                 return mad_send_wr->send_buf.mad +
 975                        mad_send_wr->send_buf.hdr_len;
 976 }
 977
 978 void ib_free_send_mad(struct ib_mad_send_buf *send_buf)
 979 {
 980         struct ib_mad_agent_private *mad_agent_priv;
 981         struct ib_mad_send_wr_private *mad_send_wr;
 982
 983         mad_agent_priv = container_of(send_buf->mad_agent,
 984                                       struct ib_mad_agent_private, agent);
 985         mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
 986                                    send_buf);
 987
 988         free_send_rmpp_list(mad_send_wr);
 989         kfree(send_buf->mad);
 990         deref_mad_agent(mad_agent_priv);
 991 }
 992 EXPORT_SYMBOL(ib_free_send_mad);
 993
 994 int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr)
 995 {
 996         struct ib_mad_qp_info *qp_info;
 997         struct list_head *list;
 998         struct ib_send_wr *bad_send_wr;
 999         struct ib_mad_agent *mad_agent;
1000         struct ib_sge *sge;
1001         unsigned long flags;
1002         int ret;
1003
1004         /* Set WR ID to find mad_send_wr upon completion */
1005         qp_info = mad_send_wr->mad_agent_priv->qp_info;
1006         mad_send_wr->send_wr.wr_id = (unsigned long)&mad_send_wr->mad_list;
1007         mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;
1008
1009         mad_agent = mad_send_wr->send_buf.mad_agent;
1010         sge = mad_send_wr->sg_list;
1011         sge[0].addr = ib_dma_map_single(mad_agent->device,
1012                                         mad_send_wr->send_buf.mad,
1013                                         sge[0].length,
1014                                         DMA_TO_DEVICE);
1015         mad_send_wr->header_mapping = sge[0].addr;
1016
1017         sge[1].addr = ib_dma_map_single(mad_agent->device,
1018                                         ib_get_payload(mad_send_wr),
1019                                         sge[1].length,
1020                                         DMA_TO_DEVICE);
1021         mad_send_wr->payload_mapping = sge[1].addr;
1022
1023         spin_lock_irqsave(&qp_info->send_queue.lock, flags);
1024         if (qp_info->send_queue.count < qp_info->send_queue.max_active) {
1025                 ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr,
1026                                    &bad_send_wr);
1027                 list = &qp_info->send_queue.list;
1028         } else {
1029                 ret = 0;
1030                 list = &qp_info->overflow_list;
1031         }
1032
1033         if (!ret) {
1034                 qp_info->send_queue.count++;
1035                 list_add_tail(&mad_send_wr->mad_list.list, list);
1036         }
1037         spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
1038         if (ret) {
1039                 ib_dma_unmap_single(mad_agent->device,
1040                                     mad_send_wr->header_mapping,
1041                                     sge[0].length, DMA_TO_DEVICE);
1042                 ib_dma_unmap_single(mad_agent->device,
1043                                     mad_send_wr->payload_mapping,
1044                                     sge[1].length, DMA_TO_DEVICE);
1045         }
1046         return ret;
1047 }
1048
1049 /*
1050  * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
1051  *  with the registered client
1052  */
1053 int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
1054                      struct ib_mad_send_buf **bad_send_buf)
1055 {
1056         struct ib_mad_agent_private *mad_agent_priv;
1057         struct ib_mad_send_buf *next_send_buf;
1058         struct ib_mad_send_wr_private *mad_send_wr;
1059         unsigned long flags;
1060         int ret = -EINVAL;
1061
1062         /* Walk list of send WRs and post each on send list */
1063         for (; send_buf; send_buf = next_send_buf) {
1064
1065                 mad_send_wr = container_of(send_buf,
1066                                            struct ib_mad_send_wr_private,
1067                                            send_buf);
1068                 mad_agent_priv = mad_send_wr->mad_agent_priv;
1069
1070                 if (!send_buf->mad_agent->send_handler ||
1071                     (send_buf->timeout_ms &&
1072                      !send_buf->mad_agent->recv_handler)) {
1073                         ret = -EINVAL;
1074                         goto error;
1075                 }
1076
1077                 if (!ib_is_mad_class_rmpp(((struct ib_mad_hdr *) send_buf->mad)->mgmt_class)) {
1078                         if (mad_agent_priv->agent.rmpp_version) {
1079                                 ret = -EINVAL;
1080                                 goto error;
1081                         }
1082                 }
1083
1084                 /*
1085                  * Save pointer to next work request to post in case the
1086                  * current one completes, and the user modifies the work
1087                  * request associated with the completion
1088                  */
1089                 next_send_buf = send_buf->next;
1090                 mad_send_wr->send_wr.wr.ud.ah = send_buf->ah;
1091
1092                 if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class ==
1093                     IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1094                         ret = handle_outgoing_dr_smp(mad_agent_priv,
1095                                                      mad_send_wr);
1096                         if (ret < 0)            /* error */
1097                                 goto error;
1098                         else if (ret == 1)      /* locally consumed */
1099                                 continue;
1100                 }
1101
1102                 mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid;
1103                 /* Timeout will be updated after send completes */
1104                 mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms);
1105                 mad_send_wr->max_retries = send_buf->retries;
1106                 mad_send_wr->retries_left = send_buf->retries;
1107                 send_buf->retries = 0;
1108                 /* Reference for work request to QP + response */
1109                 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0);
1110                 mad_send_wr->status = IB_WC_SUCCESS;
1111
1112                 /* Reference MAD agent until send completes */
1113                 atomic_inc(&mad_agent_priv->refcount);
1114                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1115                 list_add_tail(&mad_send_wr->agent_list,
1116                               &mad_agent_priv->send_list);
1117                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1118
1119                 if (mad_agent_priv->agent.rmpp_version) {
1120                         ret = ib_send_rmpp_mad(mad_send_wr);
1121                         if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED)
1122                                 ret = ib_send_mad(mad_send_wr);
1123                 } else
1124                         ret = ib_send_mad(mad_send_wr);
1125                 if (ret < 0) {
1126                         /* Fail send request */
1127                         spin_lock_irqsave(&mad_agent_priv->lock, flags);
1128                         list_del(&mad_send_wr->agent_list);
1129                         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1130                         atomic_dec(&mad_agent_priv->refcount);
1131                         goto error;
1132                 }
1133         }
1134         return 0;
1135 error:
1136         if (bad_send_buf)
1137                 *bad_send_buf = send_buf;
1138         return ret;
1139 }
1140 EXPORT_SYMBOL(ib_post_send_mad);
1141
1142 /*
1143  * ib_free_recv_mad - Returns data buffers used to receive
1144  *  a MAD to the access layer
1145  */
1146 void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc)
1147 {
1148         struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf;
1149         struct ib_mad_private_header *mad_priv_hdr;
1150         struct ib_mad_private *priv;
1151         struct list_head free_list;
1152
1153         INIT_LIST_HEAD(&free_list);
1154         list_splice_init(&mad_recv_wc->rmpp_list, &free_list);
1155
1156         list_for_each_entry_safe(mad_recv_buf, temp_recv_buf,
1157                                         &free_list, list) {
1158                 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc,
1159                                            recv_buf);
1160                 mad_priv_hdr = container_of(mad_recv_wc,
1161                                             struct ib_mad_private_header,
1162                                             recv_wc);
1163                 priv = container_of(mad_priv_hdr, struct ib_mad_private,
1164                                     header);
1165                 kmem_cache_free(ib_mad_cache, priv);
1166         }
1167 }
1168 EXPORT_SYMBOL(ib_free_recv_mad);
1169
1170 struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
1171                                         u8 rmpp_version,
1172                                         ib_mad_send_handler send_handler,
1173                                         ib_mad_recv_handler recv_handler,
1174                                         void *context)
1175 {
1176         return ERR_PTR(-EINVAL);        /* XXX: for now */
1177 }
1178 EXPORT_SYMBOL(ib_redirect_mad_qp);
1179
1180 int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
1181                       struct ib_wc *wc)
1182 {
1183         printk(KERN_ERR PFX "ib_process_mad_wc() not implemented yet\n");
1184         return 0;
1185 }
1186 EXPORT_SYMBOL(ib_process_mad_wc);
1187
1188 static int method_in_use(struct ib_mad_mgmt_method_table **method,
1189                          struct ib_mad_reg_req *mad_reg_req)
1190 {
1191         int i;
1192
1193         for (i = find_first_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS);
1194              i < IB_MGMT_MAX_METHODS;
1195              i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1196                                1+i)) {
1197                 if ((*method)->agent[i]) {
1198                         printk(KERN_ERR PFX "Method %d already in use\n", i);
1199                         return -EINVAL;
1200                 }
1201         }
1202         return 0;
1203 }
1204
1205 static int allocate_method_table(struct ib_mad_mgmt_method_table **method)
1206 {
1207         /* Allocate management method table */
1208         *method = kzalloc(sizeof **method, GFP_ATOMIC);
1209         if (!*method) {
1210                 printk(KERN_ERR PFX "No memory for "
1211                        "ib_mad_mgmt_method_table\n");
1212                 return -ENOMEM;
1213         }
1214
1215         return 0;
1216 }
1217
1218 /*
1219  * Check to see if there are any methods still in use
1220  */
1221 static int check_method_table(struct ib_mad_mgmt_method_table *method)
1222 {
1223         int i;
1224
1225         for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
1226                 if (method->agent[i])
1227                         return 1;
1228         return 0;
1229 }
1230
1231 /*
1232  * Check to see if there are any method tables for this class still in use
1233  */
1234 static int check_class_table(struct ib_mad_mgmt_class_table *class)
1235 {
1236         int i;
1237
1238         for (i = 0; i < MAX_MGMT_CLASS; i++)
1239                 if (class->method_table[i])
1240                         return 1;
1241         return 0;
1242 }
1243
1244 static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class)
1245 {
1246         int i;
1247
1248         for (i = 0; i < MAX_MGMT_OUI; i++)
1249                 if (vendor_class->method_table[i])
1250                         return 1;
1251         return 0;
1252 }
1253
1254 static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class,
1255                            char *oui)
1256 {
1257         int i;
1258
1259         for (i = 0; i < MAX_MGMT_OUI; i++)
1260                 /* Is there matching OUI for this vendor class ? */
1261                 if (!memcmp(vendor_class->oui[i], oui, 3))
1262                         return i;
1263
1264         return -1;
1265 }
1266
1267 static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor)
1268 {
1269         int i;
1270
1271         for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++)
1272                 if (vendor->vendor_class[i])
1273                         return 1;
1274
1275         return 0;
1276 }
1277
1278 static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method,
1279                                      struct ib_mad_agent_private *agent)
1280 {
1281         int i;
1282
1283         /* Remove any methods for this mad agent */
1284         for (i = 0; i < IB_MGMT_MAX_METHODS; i++) {
1285                 if (method->agent[i] == agent) {
1286                         method->agent[i] = NULL;
1287                 }
1288         }
1289 }
1290
1291 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1292                               struct ib_mad_agent_private *agent_priv,
1293                               u8 mgmt_class)
1294 {
1295         struct ib_mad_port_private *port_priv;
1296         struct ib_mad_mgmt_class_table **class;
1297         struct ib_mad_mgmt_method_table **method;
1298         int i, ret;
1299
1300         port_priv = agent_priv->qp_info->port_priv;
1301         class = &port_priv->version[mad_reg_req->mgmt_class_version].class;
1302         if (!*class) {
1303                 /* Allocate management class table for "new" class version */
1304                 *class = kzalloc(sizeof **class, GFP_ATOMIC);
1305                 if (!*class) {
1306                         printk(KERN_ERR PFX "No memory for "
1307                                "ib_mad_mgmt_class_table\n");
1308                         ret = -ENOMEM;
1309                         goto error1;
1310                 }
1311
1312                 /* Allocate method table for this management class */
1313                 method = &(*class)->method_table[mgmt_class];
1314                 if ((ret = allocate_method_table(method)))
1315                         goto error2;
1316         } else {
1317                 method = &(*class)->method_table[mgmt_class];
1318                 if (!*method) {
1319                         /* Allocate method table for this management class */
1320                         if ((ret = allocate_method_table(method)))
1321                                 goto error1;
1322                 }
1323         }
1324
1325         /* Now, make sure methods are not already in use */
1326         if (method_in_use(method, mad_reg_req))
1327                 goto error3;
1328
1329         /* Finally, add in methods being registered */
1330         for (i = find_first_bit(mad_reg_req->method_mask,
1331                                 IB_MGMT_MAX_METHODS);
1332              i < IB_MGMT_MAX_METHODS;
1333              i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1334                                1+i)) {
1335                 (*method)->agent[i] = agent_priv;
1336         }
1337         return 0;
1338
1339 error3:
1340         /* Remove any methods for this mad agent */
1341         remove_methods_mad_agent(*method, agent_priv);
1342         /* Now, check to see if there are any methods in use */
1343         if (!check_method_table(*method)) {
1344                 /* If not, release management method table */
1345                 kfree(*method);
1346                 *method = NULL;
1347         }
1348         ret = -EINVAL;
1349         goto error1;
1350 error2:
1351         kfree(*class);
1352         *class = NULL;
1353 error1:
1354         return ret;
1355 }
1356
1357 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1358                            struct ib_mad_agent_private *agent_priv)
1359 {
1360         struct ib_mad_port_private *port_priv;
1361         struct ib_mad_mgmt_vendor_class_table **vendor_table;
1362         struct ib_mad_mgmt_vendor_class_table *vendor = NULL;
1363         struct ib_mad_mgmt_vendor_class *vendor_class = NULL;
1364         struct ib_mad_mgmt_method_table **method;
1365         int i, ret = -ENOMEM;
1366         u8 vclass;
1367
1368         /* "New" vendor (with OUI) class */
1369         vclass = vendor_class_index(mad_reg_req->mgmt_class);
1370         port_priv = agent_priv->qp_info->port_priv;
1371         vendor_table = &port_priv->version[
1372                                 mad_reg_req->mgmt_class_version].vendor;
1373         if (!*vendor_table) {
1374                 /* Allocate mgmt vendor class table for "new" class version */
1375                 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC);
1376                 if (!vendor) {
1377                         printk(KERN_ERR PFX "No memory for "
1378                                "ib_mad_mgmt_vendor_class_table\n");
1379                         goto error1;
1380                 }
1381
1382                 *vendor_table = vendor;
1383         }
1384         if (!(*vendor_table)->vendor_class[vclass]) {
1385                 /* Allocate table for this management vendor class */
1386                 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC);
1387                 if (!vendor_class) {
1388                         printk(KERN_ERR PFX "No memory for "
1389                                "ib_mad_mgmt_vendor_class\n");
1390                         goto error2;
1391                 }
1392
1393                 (*vendor_table)->vendor_class[vclass] = vendor_class;
1394         }
1395         for (i = 0; i < MAX_MGMT_OUI; i++) {
1396                 /* Is there matching OUI for this vendor class ? */
1397                 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i],
1398                             mad_reg_req->oui, 3)) {
1399                         method = &(*vendor_table)->vendor_class[
1400                                                 vclass]->method_table[i];
1401                         BUG_ON(!*method);
1402                         goto check_in_use;
1403                 }
1404         }
1405         for (i = 0; i < MAX_MGMT_OUI; i++) {
1406                 /* OUI slot available ? */
1407                 if (!is_vendor_oui((*vendor_table)->vendor_class[
1408                                 vclass]->oui[i])) {
1409                         method = &(*vendor_table)->vendor_class[
1410                                 vclass]->method_table[i];
1411                         BUG_ON(*method);
1412                         /* Allocate method table for this OUI */
1413                         if ((ret = allocate_method_table(method)))
1414                                 goto error3;
1415                         memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
1416                                mad_reg_req->oui, 3);
1417                         goto check_in_use;
1418                 }
1419         }
1420         printk(KERN_ERR PFX "All OUI slots in use\n");
1421         goto error3;
1422
1423 check_in_use:
1424         /* Now, make sure methods are not already in use */
1425         if (method_in_use(method, mad_reg_req))
1426                 goto error4;
1427
1428         /* Finally, add in methods being registered */
1429         for (i = find_first_bit(mad_reg_req->method_mask,
1430                                 IB_MGMT_MAX_METHODS);
1431              i < IB_MGMT_MAX_METHODS;
1432              i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1433                                1+i)) {
1434                 (*method)->agent[i] = agent_priv;
1435         }
1436         return 0;
1437
1438 error4:
1439         /* Remove any methods for this mad agent */
1440         remove_methods_mad_agent(*method, agent_priv);
1441         /* Now, check to see if there are any methods in use */
1442         if (!check_method_table(*method)) {
1443                 /* If not, release management method table */
1444                 kfree(*method);
1445                 *method = NULL;
1446         }
1447         ret = -EINVAL;
1448 error3:
1449         if (vendor_class) {
1450                 (*vendor_table)->vendor_class[vclass] = NULL;
1451                 kfree(vendor_class);
1452         }
1453 error2:
1454         if (vendor) {
1455                 *vendor_table = NULL;
1456                 kfree(vendor);
1457         }
1458 error1:
1459         return ret;
1460 }
1461
1462 static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv)
1463 {
1464         struct ib_mad_port_private *port_priv;
1465         struct ib_mad_mgmt_class_table *class;
1466         struct ib_mad_mgmt_method_table *method;
1467         struct ib_mad_mgmt_vendor_class_table *vendor;
1468         struct ib_mad_mgmt_vendor_class *vendor_class;
1469         int index;
1470         u8 mgmt_class;
1471
1472         /*
1473          * Was MAD registration request supplied
1474          * with original registration ?
1475          */
1476         if (!agent_priv->reg_req) {
1477                 goto out;
1478         }
1479
1480         port_priv = agent_priv->qp_info->port_priv;
1481         mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class);
1482         class = port_priv->version[
1483                         agent_priv->reg_req->mgmt_class_version].class;
1484         if (!class)
1485                 goto vendor_check;
1486
1487         method = class->method_table[mgmt_class];
1488         if (method) {
1489                 /* Remove any methods for this mad agent */
1490                 remove_methods_mad_agent(method, agent_priv);
1491                 /* Now, check to see if there are any methods still in use */
1492                 if (!check_method_table(method)) {
1493                         /* If not, release management method table */
1494                          kfree(method);
1495                          class->method_table[mgmt_class] = NULL;
1496                          /* Any management classes left ? */
1497                         if (!check_class_table(class)) {
1498                                 /* If not, release management class table */
1499                                 kfree(class);
1500                                 port_priv->version[
1501                                         agent_priv->reg_req->
1502                                         mgmt_class_version].class = NULL;
1503                         }
1504                 }
1505         }
1506
1507 vendor_check:
1508         if (!is_vendor_class(mgmt_class))
1509                 goto out;
1510
1511         /* normalize mgmt_class to vendor range 2 */
1512         mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class);
1513         vendor = port_priv->version[
1514                         agent_priv->reg_req->mgmt_class_version].vendor;
1515
1516         if (!vendor)
1517                 goto out;
1518
1519         vendor_class = vendor->vendor_class[mgmt_class];
1520         if (vendor_class) {
1521                 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui);
1522                 if (index < 0)
1523                         goto out;
1524                 method = vendor_class->method_table[index];
1525                 if (method) {
1526                         /* Remove any methods for this mad agent */
1527                         remove_methods_mad_agent(method, agent_priv);
1528                         /*
1529                          * Now, check to see if there are
1530                          * any methods still in use
1531                          */
1532                         if (!check_method_table(method)) {
1533                                 /* If not, release management method table */
1534                                 kfree(method);
1535                                 vendor_class->method_table[index] = NULL;
1536                                 memset(vendor_class->oui[index], 0, 3);
1537                                 /* Any OUIs left ? */
1538                                 if (!check_vendor_class(vendor_class)) {
1539                                         /* If not, release vendor class table */
1540                                         kfree(vendor_class);
1541                                         vendor->vendor_class[mgmt_class] = NULL;
1542                                         /* Any other vendor classes left ? */
1543                                         if (!check_vendor_table(vendor)) {
1544                                                 kfree(vendor);
1545                                                 port_priv->version[
1546                                                         agent_priv->reg_req->
1547                                                         mgmt_class_version].
1548                                                         vendor = NULL;
1549                                         }
1550                                 }
1551                         }
1552                 }
1553         }
1554
1555 out:
1556         return;
1557 }
1558
1559 static struct ib_mad_agent_private *
1560 find_mad_agent(struct ib_mad_port_private *port_priv,
1561                struct ib_mad *mad)
1562 {
1563         struct ib_mad_agent_private *mad_agent = NULL;
1564         unsigned long flags;
1565
1566         spin_lock_irqsave(&port_priv->reg_lock, flags);
1567         if (ib_response_mad(mad)) {
1568                 u32 hi_tid;
1569                 struct ib_mad_agent_private *entry;
1570
1571                 /*
1572                  * Routing is based on high 32 bits of transaction ID
1573                  * of MAD.
1574                  */
1575                 hi_tid = be64_to_cpu(mad->mad_hdr.tid) >> 32;
1576                 list_for_each_entry(entry, &port_priv->agent_list, agent_list) {
1577                         if (entry->agent.hi_tid == hi_tid) {
1578                                 mad_agent = entry;
1579                                 break;
1580                         }
1581                 }
1582         } else {
1583                 struct ib_mad_mgmt_class_table *class;
1584                 struct ib_mad_mgmt_method_table *method;
1585                 struct ib_mad_mgmt_vendor_class_table *vendor;
1586                 struct ib_mad_mgmt_vendor_class *vendor_class;
1587                 struct ib_vendor_mad *vendor_mad;
1588                 int index;
1589
1590                 /*
1591                  * Routing is based on version, class, and method
1592                  * For "newer" vendor MADs, also based on OUI
1593                  */
1594                 if (mad->mad_hdr.class_version >= MAX_MGMT_VERSION)
1595                         goto out;
1596                 if (!is_vendor_class(mad->mad_hdr.mgmt_class)) {
1597                         class = port_priv->version[
1598                                         mad->mad_hdr.class_version].class;
1599                         if (!class)
1600                                 goto out;
1601                         method = class->method_table[convert_mgmt_class(
1602                                                         mad->mad_hdr.mgmt_class)];
1603                         if (method)
1604                                 mad_agent = method->agent[mad->mad_hdr.method &
1605                                                           ~IB_MGMT_METHOD_RESP];
1606                 } else {
1607                         vendor = port_priv->version[
1608                                         mad->mad_hdr.class_version].vendor;
1609                         if (!vendor)
1610                                 goto out;
1611                         vendor_class = vendor->vendor_class[vendor_class_index(
1612                                                 mad->mad_hdr.mgmt_class)];
1613                         if (!vendor_class)
1614                                 goto out;
1615                         /* Find matching OUI */
1616                         vendor_mad = (struct ib_vendor_mad *)mad;
1617                         index = find_vendor_oui(vendor_class, vendor_mad->oui);
1618                         if (index == -1)
1619                                 goto out;
1620                         method = vendor_class->method_table[index];
1621                         if (method) {
1622                                 mad_agent = method->agent[mad->mad_hdr.method &
1623                                                           ~IB_MGMT_METHOD_RESP];
1624                         }
1625                 }
1626         }
1627
1628         if (mad_agent) {
1629                 if (mad_agent->agent.recv_handler)
1630                         atomic_inc(&mad_agent->refcount);
1631                 else {
1632                         printk(KERN_NOTICE PFX "No receive handler for client "
1633                                "%p on port %d\n",
1634                                &mad_agent->agent, port_priv->port_num);
1635                         mad_agent = NULL;
1636                 }
1637         }
1638 out:
1639         spin_unlock_irqrestore(&port_priv->reg_lock, flags);
1640
1641         return mad_agent;
1642 }
1643
1644 static int validate_mad(struct ib_mad *mad, u32 qp_num)
1645 {
1646         int valid = 0;
1647
1648         /* Make sure MAD base version is understood */
1649         if (mad->mad_hdr.base_version != IB_MGMT_BASE_VERSION) {
1650                 printk(KERN_ERR PFX "MAD received with unsupported base "
1651                        "version %d\n", mad->mad_hdr.base_version);
1652                 goto out;
1653         }
1654
1655         /* Filter SMI packets sent to other than QP0 */
1656         if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
1657             (mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
1658                 if (qp_num == 0)
1659                         valid = 1;
1660         } else {
1661                 /* Filter GSI packets sent to QP0 */
1662                 if (qp_num != 0)
1663                         valid = 1;
1664         }
1665
1666 out:
1667         return valid;
1668 }
1669
1670 static int is_data_mad(struct ib_mad_agent_private *mad_agent_priv,
1671                        struct ib_mad_hdr *mad_hdr)
1672 {
1673         struct ib_rmpp_mad *rmpp_mad;
1674
1675         rmpp_mad = (struct ib_rmpp_mad *)mad_hdr;
1676         return !mad_agent_priv->agent.rmpp_version ||
1677                 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
1678                                     IB_MGMT_RMPP_FLAG_ACTIVE) ||
1679                 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA);
1680 }
1681
1682 static inline int rcv_has_same_class(struct ib_mad_send_wr_private *wr,
1683                                      struct ib_mad_recv_wc *rwc)
1684 {
1685         return ((struct ib_mad *)(wr->send_buf.mad))->mad_hdr.mgmt_class ==
1686                 rwc->recv_buf.mad->mad_hdr.mgmt_class;
1687 }
1688
1689 static inline int rcv_has_same_gid(struct ib_mad_agent_private *mad_agent_priv,
1690                                    struct ib_mad_send_wr_private *wr,
1691                                    struct ib_mad_recv_wc *rwc )
1692 {
1693         struct ib_ah_attr attr;
1694         u8 send_resp, rcv_resp;
1695         union ib_gid sgid;
1696         struct ib_device *device = mad_agent_priv->agent.device;
1697         u8 port_num = mad_agent_priv->agent.port_num;
1698         u8 lmc;
1699
1700         send_resp = ib_response_mad((struct ib_mad *)wr->send_buf.mad);
1701         rcv_resp = ib_response_mad(rwc->recv_buf.mad);
1702
1703         if (send_resp == rcv_resp)
1704                 /* both requests, or both responses. GIDs different */
1705                 return 0;
1706
1707         if (ib_query_ah(wr->send_buf.ah, &attr))
1708                 /* Assume not equal, to avoid false positives. */
1709                 return 0;
1710
1711         if (!!(attr.ah_flags & IB_AH_GRH) !=
1712             !!(rwc->wc->wc_flags & IB_WC_GRH))
1713                 /* one has GID, other does not.  Assume different */
1714                 return 0;
1715
1716         if (!send_resp && rcv_resp) {
1717                 /* is request/response. */
1718                 if (!(attr.ah_flags & IB_AH_GRH)) {
1719                         if (ib_get_cached_lmc(device, port_num, &lmc))
1720                                 return 0;
1721                         return (!lmc || !((attr.src_path_bits ^
1722                                            rwc->wc->dlid_path_bits) &
1723                                           ((1 << lmc) - 1)));
1724                 } else {
1725                         if (ib_get_cached_gid(device, port_num,
1726                                               attr.grh.sgid_index, &sgid))
1727                                 return 0;
1728                         return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw,
1729                                        16);
1730                 }
1731         }
1732
1733         if (!(attr.ah_flags & IB_AH_GRH))
1734                 return attr.dlid == rwc->wc->slid;
1735         else
1736                 return !memcmp(attr.grh.dgid.raw, rwc->recv_buf.grh->sgid.raw,
1737                                16);
1738 }
1739
1740 static inline int is_direct(u8 class)
1741 {
1742         return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE);
1743 }
1744
1745 struct ib_mad_send_wr_private*
1746 ib_find_send_mad(struct ib_mad_agent_private *mad_agent_priv,
1747                  struct ib_mad_recv_wc *wc)
1748 {
1749         struct ib_mad_send_wr_private *wr;
1750         struct ib_mad *mad;
1751
1752         mad = (struct ib_mad *)wc->recv_buf.mad;
1753
1754         list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) {
1755                 if ((wr->tid == mad->mad_hdr.tid) &&
1756                     rcv_has_same_class(wr, wc) &&
1757                     /*
1758                      * Don't check GID for direct routed MADs.
1759                      * These might have permissive LIDs.
1760                      */
1761                     (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) ||
1762                      rcv_has_same_gid(mad_agent_priv, wr, wc)))
1763                         return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1764         }
1765
1766         /*
1767          * It's possible to receive the response before we've
1768          * been notified that the send has completed
1769          */
1770         list_for_each_entry(wr, &mad_agent_priv->send_list, agent_list) {
1771                 if (is_data_mad(mad_agent_priv, wr->send_buf.mad) &&
1772                     wr->tid == mad->mad_hdr.tid &&
1773                     wr->timeout &&
1774                     rcv_has_same_class(wr, wc) &&
1775                     /*
1776                      * Don't check GID for direct routed MADs.
1777                      * These might have permissive LIDs.
1778                      */
1779                     (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) ||
1780                      rcv_has_same_gid(mad_agent_priv, wr, wc)))
1781                         /* Verify request has not been canceled */
1782                         return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1783         }
1784         return NULL;
1785 }
1786
1787 void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr)
1788 {
1789         mad_send_wr->timeout = 0;
1790         if (mad_send_wr->refcount == 1)
1791                 list_move_tail(&mad_send_wr->agent_list,
1792                               &mad_send_wr->mad_agent_priv->done_list);
1793 }
1794
1795 static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
1796                                  struct ib_mad_recv_wc *mad_recv_wc)
1797 {
1798         struct ib_mad_send_wr_private *mad_send_wr;
1799         struct ib_mad_send_wc mad_send_wc;
1800         unsigned long flags;
1801
1802         INIT_LIST_HEAD(&mad_recv_wc->rmpp_list);
1803         list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list);
1804         if (mad_agent_priv->agent.rmpp_version) {
1805                 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv,
1806                                                       mad_recv_wc);
1807                 if (!mad_recv_wc) {
1808                         deref_mad_agent(mad_agent_priv);
1809                         return;
1810                 }
1811         }
1812
1813         /* Complete corresponding request */
1814         if (ib_response_mad(mad_recv_wc->recv_buf.mad)) {
1815                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1816                 mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc);
1817                 if (!mad_send_wr) {
1818                         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1819                         ib_free_recv_mad(mad_recv_wc);
1820                         deref_mad_agent(mad_agent_priv);
1821                         return;
1822                 }
1823                 ib_mark_mad_done(mad_send_wr);
1824                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1825
1826                 /* Defined behavior is to complete response before request */
1827                 mad_recv_wc->wc->wr_id = (unsigned long) &mad_send_wr->send_buf;
1828                 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1829                                                    mad_recv_wc);
1830                 atomic_dec(&mad_agent_priv->refcount);
1831
1832                 mad_send_wc.status = IB_WC_SUCCESS;
1833                 mad_send_wc.vendor_err = 0;
1834                 mad_send_wc.send_buf = &mad_send_wr->send_buf;
1835                 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
1836         } else {
1837                 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1838                                                    mad_recv_wc);
1839                 deref_mad_agent(mad_agent_priv);
1840         }
1841 }
1842
1843 static void ib_mad_recv_done_handler(struct ib_mad_port_private *port_priv,
1844                                      struct ib_wc *wc)
1845 {
1846         struct ib_mad_qp_info *qp_info;
1847         struct ib_mad_private_header *mad_priv_hdr;
1848         struct ib_mad_private *recv, *response = NULL;
1849         struct ib_mad_list_head *mad_list;
1850         struct ib_mad_agent_private *mad_agent;
1851         int port_num;
1852
1853         mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
1854         qp_info = mad_list->mad_queue->qp_info;
1855         dequeue_mad(mad_list);
1856
1857         mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header,
1858                                     mad_list);
1859         recv = container_of(mad_priv_hdr, struct ib_mad_private, header);
1860         ib_dma_unmap_single(port_priv->device,
1861                             recv->header.mapping,
1862                             sizeof(struct ib_mad_private) -
1863                               sizeof(struct ib_mad_private_header),
1864                             DMA_FROM_DEVICE);
1865
1866         /* Setup MAD receive work completion from "normal" work completion */
1867         recv->header.wc = *wc;
1868         recv->header.recv_wc.wc = &recv->header.wc;
1869         recv->header.recv_wc.mad_len = sizeof(struct ib_mad);
1870         recv->header.recv_wc.recv_buf.mad = &recv->mad.mad;
1871         recv->header.recv_wc.recv_buf.grh = &recv->grh;
1872
1873         if (atomic_read(&qp_info->snoop_count))
1874                 snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS);
1875
1876         /* Validate MAD */
1877         if (!validate_mad(&recv->mad.mad, qp_info->qp->qp_num))
1878                 goto out;
1879
1880         response = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
1881         if (!response) {
1882                 printk(KERN_ERR PFX "ib_mad_recv_done_handler no memory "
1883                        "for response buffer\n");
1884                 goto out;
1885         }
1886
1887         if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH)
1888                 port_num = wc->port_num;
1889         else
1890                 port_num = port_priv->port_num;
1891
1892         if (recv->mad.mad.mad_hdr.mgmt_class ==
1893             IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1894                 enum smi_forward_action retsmi;
1895
1896                 if (smi_handle_dr_smp_recv(&recv->mad.smp,
1897                                            port_priv->device->node_type,
1898                                            port_num,
1899                                            port_priv->device->phys_port_cnt) ==
1900                                            IB_SMI_DISCARD)
1901                         goto out;
1902
1903                 retsmi = smi_check_forward_dr_smp(&recv->mad.smp);
1904                 if (retsmi == IB_SMI_LOCAL)
1905                         goto local;
1906
1907                 if (retsmi == IB_SMI_SEND) { /* don't forward */
1908                         if (smi_handle_dr_smp_send(&recv->mad.smp,
1909                                                    port_priv->device->node_type,
1910                                                    port_num) == IB_SMI_DISCARD)
1911                                 goto out;
1912
1913                         if (smi_check_local_smp(&recv->mad.smp, port_priv->device) == IB_SMI_DISCARD)
1914                                 goto out;
1915                 } else if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH) {
1916                         /* forward case for switches */
1917                         memcpy(response, recv, sizeof(*response));
1918                         response->header.recv_wc.wc = &response->header.wc;
1919                         response->header.recv_wc.recv_buf.mad = &response->mad.mad;
1920                         response->header.recv_wc.recv_buf.grh = &response->grh;
1921
1922                         agent_send_response(&response->mad.mad,
1923                                             &response->grh, wc,
1924                                             port_priv->device,
1925                                             smi_get_fwd_port(&recv->mad.smp),
1926                                             qp_info->qp->qp_num);
1927
1928                         goto out;
1929                 }
1930         }
1931
1932 local:
1933         /* Give driver "right of first refusal" on incoming MAD */
1934         if (port_priv->device->process_mad) {
1935                 int ret;
1936
1937                 ret = port_priv->device->process_mad(port_priv->device, 0,
1938                                                      port_priv->port_num,
1939                                                      wc, &recv->grh,
1940                                                      &recv->mad.mad,
1941                                                      &response->mad.mad);
1942                 if (ret & IB_MAD_RESULT_SUCCESS) {
1943                         if (ret & IB_MAD_RESULT_CONSUMED)
1944                                 goto out;
1945                         if (ret & IB_MAD_RESULT_REPLY) {
1946                                 agent_send_response(&response->mad.mad,
1947                                                     &recv->grh, wc,
1948                                                     port_priv->device,
1949                                                     port_num,
1950                                                     qp_info->qp->qp_num);
1951                                 goto out;
1952                         }
1953                 }
1954         }
1955
1956         mad_agent = find_mad_agent(port_priv, &recv->mad.mad);
1957         if (mad_agent) {
1958                 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
1959                 /*
1960                  * recv is freed up in error cases in ib_mad_complete_recv
1961                  * or via recv_handler in ib_mad_complete_recv()
1962                  */
1963                 recv = NULL;
1964         }
1965
1966 out:
1967         /* Post another receive request for this QP */
1968         if (response) {
1969                 ib_mad_post_receive_mads(qp_info, response);
1970                 if (recv)
1971                         kmem_cache_free(ib_mad_cache, recv);
1972         } else
1973                 ib_mad_post_receive_mads(qp_info, recv);
1974 }
1975
1976 static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
1977 {
1978         struct ib_mad_send_wr_private *mad_send_wr;
1979         unsigned long delay;
1980
1981         if (list_empty(&mad_agent_priv->wait_list)) {
1982                 cancel_delayed_work(&mad_agent_priv->timed_work);
1983         } else {
1984                 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
1985                                          struct ib_mad_send_wr_private,
1986                                          agent_list);
1987
1988                 if (time_after(mad_agent_priv->timeout,
1989                                mad_send_wr->timeout)) {
1990                         mad_agent_priv->timeout = mad_send_wr->timeout;
1991                         cancel_delayed_work(&mad_agent_priv->timed_work);
1992                         delay = mad_send_wr->timeout - jiffies;
1993                         if ((long)delay <= 0)
1994                                 delay = 1;
1995                         queue_delayed_work(mad_agent_priv->qp_info->
1996                                            port_priv->wq,
1997                                            &mad_agent_priv->timed_work, delay);
1998                 }
1999         }
2000 }
2001
2002 static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
2003 {
2004         struct ib_mad_agent_private *mad_agent_priv;
2005         struct ib_mad_send_wr_private *temp_mad_send_wr;
2006         struct list_head *list_item;
2007         unsigned long delay;
2008
2009         mad_agent_priv = mad_send_wr->mad_agent_priv;
2010         list_del(&mad_send_wr->agent_list);
2011
2012         delay = mad_send_wr->timeout;
2013         mad_send_wr->timeout += jiffies;
2014
2015         if (delay) {
2016                 list_for_each_prev(list_item, &mad_agent_priv->wait_list) {
2017                         temp_mad_send_wr = list_entry(list_item,
2018                                                 struct ib_mad_send_wr_private,
2019                                                 agent_list);
2020                         if (time_after(mad_send_wr->timeout,
2021                                        temp_mad_send_wr->timeout))
2022                                 break;
2023                 }
2024         }
2025         else
2026                 list_item = &mad_agent_priv->wait_list;
2027         list_add(&mad_send_wr->agent_list, list_item);
2028
2029         /* Reschedule a work item if we have a shorter timeout */
2030         if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list) {
2031                 cancel_delayed_work(&mad_agent_priv->timed_work);
2032                 queue_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2033                                    &mad_agent_priv->timed_work, delay);
2034         }
2035 }
2036
2037 void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr,
2038                           int timeout_ms)
2039 {
2040         mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2041         wait_for_response(mad_send_wr);
2042 }
2043
2044 /*
2045  * Process a send work completion
2046  */
2047 void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
2048                              struct ib_mad_send_wc *mad_send_wc)
2049 {
2050         struct ib_mad_agent_private     *mad_agent_priv;
2051         unsigned long                   flags;
2052         int                             ret;
2053
2054         mad_agent_priv = mad_send_wr->mad_agent_priv;
2055         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2056         if (mad_agent_priv->agent.rmpp_version) {
2057                 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc);
2058                 if (ret == IB_RMPP_RESULT_CONSUMED)
2059                         goto done;
2060         } else
2061                 ret = IB_RMPP_RESULT_UNHANDLED;
2062
2063         if (mad_send_wc->status != IB_WC_SUCCESS &&
2064             mad_send_wr->status == IB_WC_SUCCESS) {
2065                 mad_send_wr->status = mad_send_wc->status;
2066                 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2067         }
2068
2069         if (--mad_send_wr->refcount > 0) {
2070                 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout &&
2071                     mad_send_wr->status == IB_WC_SUCCESS) {
2072                         wait_for_response(mad_send_wr);
2073                 }
2074                 goto done;
2075         }
2076
2077         /* Remove send from MAD agent and notify client of completion */
2078         list_del(&mad_send_wr->agent_list);
2079         adjust_timeout(mad_agent_priv);
2080         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2081
2082         if (mad_send_wr->status != IB_WC_SUCCESS )
2083                 mad_send_wc->status = mad_send_wr->status;
2084         if (ret == IB_RMPP_RESULT_INTERNAL)
2085                 ib_rmpp_send_handler(mad_send_wc);
2086         else
2087                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2088                                                    mad_send_wc);
2089
2090         /* Release reference on agent taken when sending */
2091         deref_mad_agent(mad_agent_priv);
2092         return;
2093 done:
2094         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2095 }
2096
2097 static void ib_mad_send_done_handler(struct ib_mad_port_private *port_priv,
2098                                      struct ib_wc *wc)
2099 {
2100         struct ib_mad_send_wr_private   *mad_send_wr, *queued_send_wr;
2101         struct ib_mad_list_head         *mad_list;
2102         struct ib_mad_qp_info           *qp_info;
2103         struct ib_mad_queue             *send_queue;
2104         struct ib_send_wr               *bad_send_wr;
2105         struct ib_mad_send_wc           mad_send_wc;
2106         unsigned long flags;
2107         int ret;
2108
2109         mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2110         mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2111                                    mad_list);
2112         send_queue = mad_list->mad_queue;
2113         qp_info = send_queue->qp_info;
2114
2115 retry:
2116         ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2117                             mad_send_wr->header_mapping,
2118                             mad_send_wr->sg_list[0].length, DMA_TO_DEVICE);
2119         ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2120                             mad_send_wr->payload_mapping,
2121                             mad_send_wr->sg_list[1].length, DMA_TO_DEVICE);
2122         queued_send_wr = NULL;
2123         spin_lock_irqsave(&send_queue->lock, flags);
2124         list_del(&mad_list->list);
2125
2126         /* Move queued send to the send queue */
2127         if (send_queue->count-- > send_queue->max_active) {
2128                 mad_list = container_of(qp_info->overflow_list.next,
2129                                         struct ib_mad_list_head, list);
2130                 queued_send_wr = container_of(mad_list,
2131                                         struct ib_mad_send_wr_private,
2132                                         mad_list);
2133                 list_move_tail(&mad_list->list, &send_queue->list);
2134         }
2135         spin_unlock_irqrestore(&send_queue->lock, flags);
2136
2137         mad_send_wc.send_buf = &mad_send_wr->send_buf;
2138         mad_send_wc.status = wc->status;
2139         mad_send_wc.vendor_err = wc->vendor_err;
2140         if (atomic_read(&qp_info->snoop_count))
2141                 snoop_send(qp_info, &mad_send_wr->send_buf, &mad_send_wc,
2142                            IB_MAD_SNOOP_SEND_COMPLETIONS);
2143         ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
2144
2145         if (queued_send_wr) {
2146                 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr,
2147                                    &bad_send_wr);
2148                 if (ret) {
2149                         printk(KERN_ERR PFX "ib_post_send failed: %d\n", ret);
2150                         mad_send_wr = queued_send_wr;
2151                         wc->status = IB_WC_LOC_QP_OP_ERR;
2152                         goto retry;
2153                 }
2154         }
2155 }
2156
2157 static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info)
2158 {
2159         struct ib_mad_send_wr_private *mad_send_wr;
2160         struct ib_mad_list_head *mad_list;
2161         unsigned long flags;
2162
2163         spin_lock_irqsave(&qp_info->send_queue.lock, flags);
2164         list_for_each_entry(mad_list, &qp_info->send_queue.list, list) {
2165                 mad_send_wr = container_of(mad_list,
2166                                            struct ib_mad_send_wr_private,
2167                                            mad_list);
2168                 mad_send_wr->retry = 1;
2169         }
2170         spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
2171 }
2172
2173 static void mad_error_handler(struct ib_mad_port_private *port_priv,
2174                               struct ib_wc *wc)
2175 {
2176         struct ib_mad_list_head *mad_list;
2177         struct ib_mad_qp_info *qp_info;
2178         struct ib_mad_send_wr_private *mad_send_wr;
2179         int ret;
2180
2181         /* Determine if failure was a send or receive */
2182         mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2183         qp_info = mad_list->mad_queue->qp_info;
2184         if (mad_list->mad_queue == &qp_info->recv_queue)
2185                 /*
2186                  * Receive errors indicate that the QP has entered the error
2187                  * state - error handling/shutdown code will cleanup
2188                  */
2189                 return;
2190
2191         /*
2192          * Send errors will transition the QP to SQE - move
2193          * QP to RTS and repost flushed work requests
2194          */
2195         mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2196                                    mad_list);
2197         if (wc->status == IB_WC_WR_FLUSH_ERR) {
2198                 if (mad_send_wr->retry) {
2199                         /* Repost send */
2200                         struct ib_send_wr *bad_send_wr;
2201
2202                         mad_send_wr->retry = 0;
2203                         ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr,
2204                                         &bad_send_wr);
2205                         if (ret)
2206                                 ib_mad_send_done_handler(port_priv, wc);
2207                 } else
2208                         ib_mad_send_done_handler(port_priv, wc);
2209         } else {
2210                 struct ib_qp_attr *attr;
2211
2212                 /* Transition QP to RTS and fail offending send */
2213                 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2214                 if (attr) {
2215                         attr->qp_state = IB_QPS_RTS;
2216                         attr->cur_qp_state = IB_QPS_SQE;
2217                         ret = ib_modify_qp(qp_info->qp, attr,
2218                                            IB_QP_STATE | IB_QP_CUR_STATE);
2219                         kfree(attr);
2220                         if (ret)
2221                                 printk(KERN_ERR PFX "mad_error_handler - "
2222                                        "ib_modify_qp to RTS : %d\n", ret);
2223                         else
2224                                 mark_sends_for_retry(qp_info);
2225                 }
2226                 ib_mad_send_done_handler(port_priv, wc);
2227         }
2228 }
2229
2230 /*
2231  * IB MAD completion callback
2232  */
2233 static void ib_mad_completion_handler(struct work_struct *work)
2234 {
2235         struct ib_mad_port_private *port_priv;
2236         struct ib_wc wc;
2237
2238         port_priv = container_of(work, struct ib_mad_port_private, work);
2239         ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2240
2241         while (ib_poll_cq(port_priv->cq, 1, &wc) == 1) {
2242                 if (wc.status == IB_WC_SUCCESS) {
2243                         switch (wc.opcode) {
2244                         case IB_WC_SEND:
2245                                 ib_mad_send_done_handler(port_priv, &wc);
2246                                 break;
2247                         case IB_WC_RECV:
2248                                 ib_mad_recv_done_handler(port_priv, &wc);
2249                                 break;
2250                         default:
2251                                 BUG_ON(1);
2252                                 break;
2253                         }
2254                 } else
2255                         mad_error_handler(port_priv, &wc);
2256         }
2257 }
2258
2259 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
2260 {
2261         unsigned long flags;
2262         struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr;
2263         struct ib_mad_send_wc mad_send_wc;
2264         struct list_head cancel_list;
2265
2266         INIT_LIST_HEAD(&cancel_list);
2267
2268         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2269         list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2270                                  &mad_agent_priv->send_list, agent_list) {
2271                 if (mad_send_wr->status == IB_WC_SUCCESS) {
2272                         mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2273                         mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2274                 }
2275         }
2276
2277         /* Empty wait list to prevent receives from finding a request */
2278         list_splice_init(&mad_agent_priv->wait_list, &cancel_list);
2279         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2280
2281         /* Report all cancelled requests */
2282         mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
2283         mad_send_wc.vendor_err = 0;
2284
2285         list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2286                                  &cancel_list, agent_list) {
2287                 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2288                 list_del(&mad_send_wr->agent_list);
2289                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2290                                                    &mad_send_wc);
2291                 atomic_dec(&mad_agent_priv->refcount);
2292         }
2293 }
2294
2295 static struct ib_mad_send_wr_private*
2296 find_send_wr(struct ib_mad_agent_private *mad_agent_priv,
2297              struct ib_mad_send_buf *send_buf)
2298 {
2299         struct ib_mad_send_wr_private *mad_send_wr;
2300
2301         list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
2302                             agent_list) {
2303                 if (&mad_send_wr->send_buf == send_buf)
2304                         return mad_send_wr;
2305         }
2306
2307         list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
2308                             agent_list) {
2309                 if (is_data_mad(mad_agent_priv, mad_send_wr->send_buf.mad) &&
2310                     &mad_send_wr->send_buf == send_buf)
2311                         return mad_send_wr;
2312         }
2313         return NULL;
2314 }
2315
2316 int ib_modify_mad(struct ib_mad_agent *mad_agent,
2317                   struct ib_mad_send_buf *send_buf, u32 timeout_ms)
2318 {
2319         struct ib_mad_agent_private *mad_agent_priv;
2320         struct ib_mad_send_wr_private *mad_send_wr;
2321         unsigned long flags;
2322         int active;
2323
2324         mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
2325                                       agent);
2326         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2327         mad_send_wr = find_send_wr(mad_agent_priv, send_buf);
2328         if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) {
2329                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2330                 return -EINVAL;
2331         }
2332
2333         active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1);
2334         if (!timeout_ms) {
2335                 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2336                 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2337         }
2338
2339         mad_send_wr->send_buf.timeout_ms = timeout_ms;
2340         if (active)
2341                 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2342         else
2343                 ib_reset_mad_timeout(mad_send_wr, timeout_ms);
2344
2345         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2346         return 0;
2347 }
2348 EXPORT_SYMBOL(ib_modify_mad);
2349
2350 void ib_cancel_mad(struct ib_mad_agent *mad_agent,
2351                    struct ib_mad_send_buf *send_buf)
2352 {
2353         ib_modify_mad(mad_agent, send_buf, 0);
2354 }
2355 EXPORT_SYMBOL(ib_cancel_mad);
2356
2357 static void local_completions(struct work_struct *work)
2358 {
2359         struct ib_mad_agent_private *mad_agent_priv;
2360         struct ib_mad_local_private *local;
2361         struct ib_mad_agent_private *recv_mad_agent;
2362         unsigned long flags;
2363         int recv = 0;
2364         struct ib_wc wc;
2365         struct ib_mad_send_wc mad_send_wc;
2366
2367         mad_agent_priv =
2368                 container_of(work, struct ib_mad_agent_private, local_work);
2369
2370         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2371         while (!list_empty(&mad_agent_priv->local_list)) {
2372                 local = list_entry(mad_agent_priv->local_list.next,
2373                                    struct ib_mad_local_private,
2374                                    completion_list);
2375                 list_del(&local->completion_list);
2376                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2377                 if (local->mad_priv) {
2378                         recv_mad_agent = local->recv_mad_agent;
2379                         if (!recv_mad_agent) {
2380                                 printk(KERN_ERR PFX "No receive MAD agent for local completion\n");
2381                                 goto local_send_completion;
2382                         }
2383
2384                         recv = 1;
2385                         /*
2386                          * Defined behavior is to complete response
2387                          * before request
2388                          */
2389                         build_smp_wc(recv_mad_agent->agent.qp,
2390                                      (unsigned long) local->mad_send_wr,
2391                                      be16_to_cpu(IB_LID_PERMISSIVE),
2392                                      0, recv_mad_agent->agent.port_num, &wc);
2393
2394                         local->mad_priv->header.recv_wc.wc = &wc;
2395                         local->mad_priv->header.recv_wc.mad_len =
2396                                                 sizeof(struct ib_mad);
2397                         INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list);
2398                         list_add(&local->mad_priv->header.recv_wc.recv_buf.list,
2399                                  &local->mad_priv->header.recv_wc.rmpp_list);
2400                         local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
2401                         local->mad_priv->header.recv_wc.recv_buf.mad =
2402                                                 &local->mad_priv->mad.mad;
2403                         if (atomic_read(&recv_mad_agent->qp_info->snoop_count))
2404                                 snoop_recv(recv_mad_agent->qp_info,
2405                                           &local->mad_priv->header.recv_wc,
2406                                            IB_MAD_SNOOP_RECVS);
2407                         recv_mad_agent->agent.recv_handler(
2408                                                 &recv_mad_agent->agent,
2409                                                 &local->mad_priv->header.recv_wc);
2410                         spin_lock_irqsave(&recv_mad_agent->lock, flags);
2411                         atomic_dec(&recv_mad_agent->refcount);
2412                         spin_unlock_irqrestore(&recv_mad_agent->lock, flags);
2413                 }
2414
2415 local_send_completion:
2416                 /* Complete send */
2417                 mad_send_wc.status = IB_WC_SUCCESS;
2418                 mad_send_wc.vendor_err = 0;
2419                 mad_send_wc.send_buf = &local->mad_send_wr->send_buf;
2420                 if (atomic_read(&mad_agent_priv->qp_info->snoop_count))
2421                         snoop_send(mad_agent_priv->qp_info,
2422                                    &local->mad_send_wr->send_buf,
2423                                    &mad_send_wc, IB_MAD_SNOOP_SEND_COMPLETIONS);
2424                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2425                                                    &mad_send_wc);
2426
2427                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2428                 atomic_dec(&mad_agent_priv->refcount);
2429                 if (!recv)
2430                         kmem_cache_free(ib_mad_cache, local->mad_priv);
2431                 kfree(local);
2432         }
2433         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2434 }
2435
2436 static int retry_send(struct ib_mad_send_wr_private *mad_send_wr)
2437 {
2438         int ret;
2439
2440         if (!mad_send_wr->retries_left)
2441                 return -ETIMEDOUT;
2442
2443         mad_send_wr->retries_left--;
2444         mad_send_wr->send_buf.retries++;
2445
2446         mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
2447
2448         if (mad_send_wr->mad_agent_priv->agent.rmpp_version) {
2449                 ret = ib_retry_rmpp(mad_send_wr);
2450                 switch (ret) {
2451                 case IB_RMPP_RESULT_UNHANDLED:
2452                         ret = ib_send_mad(mad_send_wr);
2453                         break;
2454                 case IB_RMPP_RESULT_CONSUMED:
2455                         ret = 0;
2456                         break;
2457                 default:
2458                         ret = -ECOMM;
2459                         break;
2460                 }
2461         } else
2462                 ret = ib_send_mad(mad_send_wr);
2463
2464         if (!ret) {
2465                 mad_send_wr->refcount++;
2466                 list_add_tail(&mad_send_wr->agent_list,
2467                               &mad_send_wr->mad_agent_priv->send_list);
2468         }
2469         return ret;
2470 }
2471
2472 static void timeout_sends(struct work_struct *work)
2473 {
2474         struct ib_mad_agent_private *mad_agent_priv;
2475         struct ib_mad_send_wr_private *mad_send_wr;
2476         struct ib_mad_send_wc mad_send_wc;
2477         unsigned long flags, delay;
2478
2479         mad_agent_priv = container_of(work, struct ib_mad_agent_private,
2480                                       timed_work.work);
2481         mad_send_wc.vendor_err = 0;
2482
2483         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2484         while (!list_empty(&mad_agent_priv->wait_list)) {
2485                 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2486                                          struct ib_mad_send_wr_private,
2487                                          agent_list);
2488
2489                 if (time_after(mad_send_wr->timeout, jiffies)) {
2490                         delay = mad_send_wr->timeout - jiffies;
2491                         if ((long)delay <= 0)
2492                                 delay = 1;
2493                         queue_delayed_work(mad_agent_priv->qp_info->
2494                                            port_priv->wq,
2495                                            &mad_agent_priv->timed_work, delay);
2496                         break;
2497                 }
2498
2499                 list_del(&mad_send_wr->agent_list);
2500                 if (mad_send_wr->status == IB_WC_SUCCESS &&
2501                     !retry_send(mad_send_wr))
2502                         continue;
2503
2504                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2505
2506                 if (mad_send_wr->status == IB_WC_SUCCESS)
2507                         mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR;
2508                 else
2509                         mad_send_wc.status = mad_send_wr->status;
2510                 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2511                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2512                                                    &mad_send_wc);
2513
2514                 atomic_dec(&mad_agent_priv->refcount);
2515                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2516         }
2517         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2518 }
2519
2520 static void ib_mad_thread_completion_handler(struct ib_cq *cq, void *arg)
2521 {
2522         struct ib_mad_port_private *port_priv = cq->cq_context;
2523         unsigned long flags;
2524
2525         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2526         if (!list_empty(&port_priv->port_list))
2527                 queue_work(port_priv->wq, &port_priv->work);
2528         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2529 }
2530
2531 /*
2532  * Allocate receive MADs and post receive WRs for them
2533  */
2534 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
2535                                     struct ib_mad_private *mad)
2536 {
2537         unsigned long flags;
2538         int post, ret;
2539         struct ib_mad_private *mad_priv;
2540         struct ib_sge sg_list;
2541         struct ib_recv_wr recv_wr, *bad_recv_wr;
2542         struct ib_mad_queue *recv_queue = &qp_info->recv_queue;
2543
2544         /* Initialize common scatter list fields */
2545         sg_list.length = sizeof *mad_priv - sizeof mad_priv->header;
2546         sg_list.lkey = (*qp_info->port_priv->mr).lkey;
2547
2548         /* Initialize common receive WR fields */
2549         recv_wr.next = NULL;
2550         recv_wr.sg_list = &sg_list;
2551         recv_wr.num_sge = 1;
2552
2553         do {
2554                 /* Allocate and map receive buffer */
2555                 if (mad) {
2556                         mad_priv = mad;
2557                         mad = NULL;
2558                 } else {
2559                         mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
2560                         if (!mad_priv) {
2561                                 printk(KERN_ERR PFX "No memory for receive buffer\n");
2562                                 ret = -ENOMEM;
2563                                 break;
2564                         }
2565                 }
2566                 sg_list.addr = ib_dma_map_single(qp_info->port_priv->device,
2567                                                  &mad_priv->grh,
2568                                                  sizeof *mad_priv -
2569                                                    sizeof mad_priv->header,
2570                                                  DMA_FROM_DEVICE);
2571                 mad_priv->header.mapping = sg_list.addr;
2572                 recv_wr.wr_id = (unsigned long)&mad_priv->header.mad_list;
2573                 mad_priv->header.mad_list.mad_queue = recv_queue;
2574
2575                 /* Post receive WR */
2576                 spin_lock_irqsave(&recv_queue->lock, flags);
2577                 post = (++recv_queue->count < recv_queue->max_active);
2578                 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list);
2579                 spin_unlock_irqrestore(&recv_queue->lock, flags);
2580                 ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr);
2581                 if (ret) {
2582                         spin_lock_irqsave(&recv_queue->lock, flags);
2583                         list_del(&mad_priv->header.mad_list.list);
2584                         recv_queue->count--;
2585                         spin_unlock_irqrestore(&recv_queue->lock, flags);
2586                         ib_dma_unmap_single(qp_info->port_priv->device,
2587                                             mad_priv->header.mapping,
2588                                             sizeof *mad_priv -
2589                                               sizeof mad_priv->header,
2590                                             DMA_FROM_DEVICE);
2591                         kmem_cache_free(ib_mad_cache, mad_priv);
2592                         printk(KERN_ERR PFX "ib_post_recv failed: %d\n", ret);
2593                         break;
2594                 }
2595         } while (post);
2596
2597         return ret;
2598 }
2599
2600 /*
2601  * Return all the posted receive MADs
2602  */
2603 static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info)
2604 {
2605         struct ib_mad_private_header *mad_priv_hdr;
2606         struct ib_mad_private *recv;
2607         struct ib_mad_list_head *mad_list;
2608
2609         while (!list_empty(&qp_info->recv_queue.list)) {
2610
2611                 mad_list = list_entry(qp_info->recv_queue.list.next,
2612                                       struct ib_mad_list_head, list);
2613                 mad_priv_hdr = container_of(mad_list,
2614                                             struct ib_mad_private_header,
2615                                             mad_list);
2616                 recv = container_of(mad_priv_hdr, struct ib_mad_private,
2617                                     header);
2618
2619                 /* Remove from posted receive MAD list */
2620                 list_del(&mad_list->list);
2621
2622                 ib_dma_unmap_single(qp_info->port_priv->device,
2623                                     recv->header.mapping,
2624                                     sizeof(struct ib_mad_private) -
2625                                       sizeof(struct ib_mad_private_header),
2626                                     DMA_FROM_DEVICE);
2627                 kmem_cache_free(ib_mad_cache, recv);
2628         }
2629
2630         qp_info->recv_queue.count = 0;
2631 }
2632
2633 /*
2634  * Start the port
2635  */
2636 static int ib_mad_port_start(struct ib_mad_port_private *port_priv)
2637 {
2638         int ret, i;
2639         struct ib_qp_attr *attr;
2640         struct ib_qp *qp;
2641
2642         attr = kmalloc(sizeof *attr, GFP_KERNEL);
2643         if (!attr) {
2644                 printk(KERN_ERR PFX "Couldn't kmalloc ib_qp_attr\n");
2645                 return -ENOMEM;
2646         }
2647
2648         for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2649                 qp = port_priv->qp_info[i].qp;
2650                 /*
2651                  * PKey index for QP1 is irrelevant but
2652                  * one is needed for the Reset to Init transition
2653                  */
2654                 attr->qp_state = IB_QPS_INIT;
2655                 attr->pkey_index = 0;
2656                 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY;
2657                 ret = ib_modify_qp(qp, attr, IB_QP_STATE |
2658                                              IB_QP_PKEY_INDEX | IB_QP_QKEY);
2659                 if (ret) {
2660                         printk(KERN_ERR PFX "Couldn't change QP%d state to "
2661                                "INIT: %d\n", i, ret);
2662                         goto out;
2663                 }
2664
2665                 attr->qp_state = IB_QPS_RTR;
2666                 ret = ib_modify_qp(qp, attr, IB_QP_STATE);
2667                 if (ret) {
2668                         printk(KERN_ERR PFX "Couldn't change QP%d state to "
2669                                "RTR: %d\n", i, ret);
2670                         goto out;
2671                 }
2672
2673                 attr->qp_state = IB_QPS_RTS;
2674                 attr->sq_psn = IB_MAD_SEND_Q_PSN;
2675                 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN);
2676                 if (ret) {
2677                         printk(KERN_ERR PFX "Couldn't change QP%d state to "
2678                                "RTS: %d\n", i, ret);
2679                         goto out;
2680                 }
2681         }
2682
2683         ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2684         if (ret) {
2685                 printk(KERN_ERR PFX "Failed to request completion "
2686                        "notification: %d\n", ret);
2687                 goto out;
2688         }
2689
2690         for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2691                 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
2692                 if (ret) {
2693                         printk(KERN_ERR PFX "Couldn't post receive WRs\n");
2694                         goto out;
2695                 }
2696         }
2697 out:
2698         kfree(attr);
2699         return ret;
2700 }
2701
2702 static void qp_event_handler(struct ib_event *event, void *qp_context)
2703 {
2704         struct ib_mad_qp_info   *qp_info = qp_context;
2705
2706         /* It's worse than that! He's dead, Jim! */
2707         printk(KERN_ERR PFX "Fatal error (%d) on MAD QP (%d)\n",
2708                 event->event, qp_info->qp->qp_num);
2709 }
2710
2711 static void init_mad_queue(struct ib_mad_qp_info *qp_info,
2712                            struct ib_mad_queue *mad_queue)
2713 {
2714         mad_queue->qp_info = qp_info;
2715         mad_queue->count = 0;
2716         spin_lock_init(&mad_queue->lock);
2717         INIT_LIST_HEAD(&mad_queue->list);
2718 }
2719
2720 static void init_mad_qp(struct ib_mad_port_private *port_priv,
2721                         struct ib_mad_qp_info *qp_info)
2722 {
2723         qp_info->port_priv = port_priv;
2724         init_mad_queue(qp_info, &qp_info->send_queue);
2725         init_mad_queue(qp_info, &qp_info->recv_queue);
2726         INIT_LIST_HEAD(&qp_info->overflow_list);
2727         spin_lock_init(&qp_info->snoop_lock);
2728         qp_info->snoop_table = NULL;
2729         qp_info->snoop_table_size = 0;
2730         atomic_set(&qp_info->snoop_count, 0);
2731 }
2732
2733 static int create_mad_qp(struct ib_mad_qp_info *qp_info,
2734                          enum ib_qp_type qp_type)
2735 {
2736         struct ib_qp_init_attr  qp_init_attr;
2737         int ret;
2738
2739         memset(&qp_init_attr, 0, sizeof qp_init_attr);
2740         qp_init_attr.send_cq = qp_info->port_priv->cq;
2741         qp_init_attr.recv_cq = qp_info->port_priv->cq;
2742         qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
2743         qp_init_attr.cap.max_send_wr = IB_MAD_QP_SEND_SIZE;
2744         qp_init_attr.cap.max_recv_wr = IB_MAD_QP_RECV_SIZE;
2745         qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG;
2746         qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG;
2747         qp_init_attr.qp_type = qp_type;
2748         qp_init_attr.port_num = qp_info->port_priv->port_num;
2749         qp_init_attr.qp_context = qp_info;
2750         qp_init_attr.event_handler = qp_event_handler;
2751         qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr);
2752         if (IS_ERR(qp_info->qp)) {
2753                 printk(KERN_ERR PFX "Couldn't create ib_mad QP%d\n",
2754                        get_spl_qp_index(qp_type));
2755                 ret = PTR_ERR(qp_info->qp);
2756                 goto error;
2757         }
2758         /* Use minimum queue sizes unless the CQ is resized */
2759         qp_info->send_queue.max_active = IB_MAD_QP_SEND_SIZE;
2760         qp_info->recv_queue.max_active = IB_MAD_QP_RECV_SIZE;
2761         return 0;
2762
2763 error:
2764         return ret;
2765 }
2766
2767 static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
2768 {
2769         ib_destroy_qp(qp_info->qp);
2770         kfree(qp_info->snoop_table);
2771 }
2772
2773 /*
2774  * Open the port
2775  * Create the QP, PD, MR, and CQ if needed
2776  */
2777 static int ib_mad_port_open(struct ib_device *device,
2778                             int port_num)
2779 {
2780         int ret, cq_size;
2781         struct ib_mad_port_private *port_priv;
2782         unsigned long flags;
2783         char name[sizeof "ib_mad123"];
2784
2785         /* Create new device info */
2786         port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
2787         if (!port_priv) {
2788                 printk(KERN_ERR PFX "No memory for ib_mad_port_private\n");
2789                 return -ENOMEM;
2790         }
2791
2792         port_priv->device = device;
2793         port_priv->port_num = port_num;
2794         spin_lock_init(&port_priv->reg_lock);
2795         INIT_LIST_HEAD(&port_priv->agent_list);
2796         init_mad_qp(port_priv, &port_priv->qp_info[0]);
2797         init_mad_qp(port_priv, &port_priv->qp_info[1]);
2798
2799         cq_size = (IB_MAD_QP_SEND_SIZE + IB_MAD_QP_RECV_SIZE) * 2;
2800         port_priv->cq = ib_create_cq(port_priv->device,
2801                                      ib_mad_thread_completion_handler,
2802                                      NULL, port_priv, cq_size, 0);
2803         if (IS_ERR(port_priv->cq)) {
2804                 printk(KERN_ERR PFX "Couldn't create ib_mad CQ\n");
2805                 ret = PTR_ERR(port_priv->cq);
2806                 goto error3;
2807         }
2808
2809         port_priv->pd = ib_alloc_pd(device);
2810         if (IS_ERR(port_priv->pd)) {
2811                 printk(KERN_ERR PFX "Couldn't create ib_mad PD\n");
2812                 ret = PTR_ERR(port_priv->pd);
2813                 goto error4;
2814         }
2815
2816         port_priv->mr = ib_get_dma_mr(port_priv->pd, IB_ACCESS_LOCAL_WRITE);
2817         if (IS_ERR(port_priv->mr)) {
2818                 printk(KERN_ERR PFX "Couldn't get ib_mad DMA MR\n");
2819                 ret = PTR_ERR(port_priv->mr);
2820                 goto error5;
2821         }
2822
2823         ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
2824         if (ret)
2825                 goto error6;
2826         ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI);
2827         if (ret)
2828                 goto error7;
2829
2830         snprintf(name, sizeof name, "ib_mad%d", port_num);
2831         port_priv->wq = create_singlethread_workqueue(name);
2832         if (!port_priv->wq) {
2833                 ret = -ENOMEM;
2834                 goto error8;
2835         }
2836         INIT_WORK(&port_priv->work, ib_mad_completion_handler);
2837
2838         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2839         list_add_tail(&port_priv->port_list, &ib_mad_port_list);
2840         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2841
2842         ret = ib_mad_port_start(port_priv);
2843         if (ret) {
2844                 printk(KERN_ERR PFX "Couldn't start port\n");
2845                 goto error9;
2846         }
2847
2848         return 0;
2849
2850 error9:
2851         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2852         list_del_init(&port_priv->port_list);
2853         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2854
2855         destroy_workqueue(port_priv->wq);
2856 error8:
2857         destroy_mad_qp(&port_priv->qp_info[1]);
2858 error7:
2859         destroy_mad_qp(&port_priv->qp_info[0]);
2860 error6:
2861         ib_dereg_mr(port_priv->mr);
2862 error5:
2863         ib_dealloc_pd(port_priv->pd);
2864 error4:
2865         ib_destroy_cq(port_priv->cq);
2866         cleanup_recv_queue(&port_priv->qp_info[1]);
2867         cleanup_recv_queue(&port_priv->qp_info[0]);
2868 error3:
2869         kfree(port_priv);
2870
2871         return ret;
2872 }
2873
2874 /*
2875  * Close the port
2876  * If there are no classes using the port, free the port
2877  * resources (CQ, MR, PD, QP) and remove the port's info structure
2878  */
2879 static int ib_mad_port_close(struct ib_device *device, int port_num)
2880 {
2881         struct ib_mad_port_private *port_priv;
2882         unsigned long flags;
2883
2884         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2885         port_priv = __ib_get_mad_port(device, port_num);
2886         if (port_priv == NULL) {
2887                 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2888                 printk(KERN_ERR PFX "Port %d not found\n", port_num);
2889                 return -ENODEV;
2890         }
2891         list_del_init(&port_priv->port_list);
2892         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2893
2894         destroy_workqueue(port_priv->wq);
2895         destroy_mad_qp(&port_priv->qp_info[1]);
2896         destroy_mad_qp(&port_priv->qp_info[0]);
2897         ib_dereg_mr(port_priv->mr);
2898         ib_dealloc_pd(port_priv->pd);
2899         ib_destroy_cq(port_priv->cq);
2900         cleanup_recv_queue(&port_priv->qp_info[1]);
2901         cleanup_recv_queue(&port_priv->qp_info[0]);
2902         /* XXX: Handle deallocation of MAD registration tables */
2903
2904         kfree(port_priv);
2905
2906         return 0;
2907 }
2908
2909 static void ib_mad_init_device(struct ib_device *device)
2910 {
2911         int start, end, i;
2912
2913         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
2914                 return;
2915
2916         if (device->node_type == RDMA_NODE_IB_SWITCH) {
2917                 start = 0;
2918                 end   = 0;
2919         } else {
2920                 start = 1;
2921                 end   = device->phys_port_cnt;
2922         }
2923
2924         for (i = start; i <= end; i++) {
2925                 if (ib_mad_port_open(device, i)) {
2926                         printk(KERN_ERR PFX "Couldn't open %s port %d\n",
2927                                device->name, i);
2928                         goto error;
2929                 }
2930                 if (ib_agent_port_open(device, i)) {
2931                         printk(KERN_ERR PFX "Couldn't open %s port %d "
2932                                "for agents\n",
2933                                device->name, i);
2934                         goto error_agent;
2935                 }
2936         }
2937         return;
2938
2939 error_agent:
2940         if (ib_mad_port_close(device, i))
2941                 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2942                        device->name, i);
2943
2944 error:
2945         i--;
2946
2947         while (i >= start) {
2948                 if (ib_agent_port_close(device, i))
2949                         printk(KERN_ERR PFX "Couldn't close %s port %d "
2950                                "for agents\n",
2951                                device->name, i);
2952                 if (ib_mad_port_close(device, i))
2953                         printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2954                                device->name, i);
2955                 i--;
2956         }
2957 }
2958
2959 static void ib_mad_remove_device(struct ib_device *device)
2960 {
2961         int i, num_ports, cur_port;
2962
2963         if (device->node_type == RDMA_NODE_IB_SWITCH) {
2964                 num_ports = 1;
2965                 cur_port = 0;
2966         } else {
2967                 num_ports = device->phys_port_cnt;
2968                 cur_port = 1;
2969         }
2970         for (i = 0; i < num_ports; i++, cur_port++) {
2971                 if (ib_agent_port_close(device, cur_port))
2972                         printk(KERN_ERR PFX "Couldn't close %s port %d "
2973                                "for agents\n",
2974                                device->name, cur_port);
2975                 if (ib_mad_port_close(device, cur_port))
2976                         printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2977                                device->name, cur_port);
2978         }
2979 }
2980
2981 static struct ib_client mad_client = {
2982         .name   = "mad",
2983         .add = ib_mad_init_device,
2984         .remove = ib_mad_remove_device
2985 };
2986
2987 static int __init ib_mad_init_module(void)
2988 {
2989         int ret;
2990
2991         spin_lock_init(&ib_mad_port_list_lock);
2992
2993         ib_mad_cache = kmem_cache_create("ib_mad",
2994                                          sizeof(struct ib_mad_private),
2995                                          0,
2996                                          SLAB_HWCACHE_ALIGN,
2997                                          NULL);
2998         if (!ib_mad_cache) {
2999                 printk(KERN_ERR PFX "Couldn't create ib_mad cache\n");
3000                 ret = -ENOMEM;
3001                 goto error1;
3002         }
3003
3004         INIT_LIST_HEAD(&ib_mad_port_list);
3005
3006         if (ib_register_client(&mad_client)) {
3007                 printk(KERN_ERR PFX "Couldn't register ib_mad client\n");
3008                 ret = -EINVAL;
3009                 goto error2;
3010         }
3011
3012         return 0;
3013
3014 error2:
3015         kmem_cache_destroy(ib_mad_cache);
3016 error1:
3017         return ret;
3018 }
3019
3020 static void __exit ib_mad_cleanup_module(void)
3021 {
3022         ib_unregister_client(&mad_client);
3023         kmem_cache_destroy(ib_mad_cache);
3024 }
3025
3026 module_init(ib_mad_init_module);
3027 module_exit(ib_mad_cleanup_module);
3028