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  * Copyright (c) 2009 HNR Consulting. All rights reserved.
   6  *
   7  * This software is available to you under a choice of one of two
   8  * licenses.  You may choose to be licensed under the terms of the GNU
   9  * General Public License (GPL) Version 2, available from the file
  10  * COPYING in the main directory of this source tree, or the
  11  * OpenIB.org BSD license below:
  12  *
  13  *     Redistribution and use in source and binary forms, with or
  14  *     without modification, are permitted provided that the following
  15  *     conditions are met:
  16  *
  17  *      - Redistributions of source code must retain the above
  18  *        copyright notice, this list of conditions and the following
  19  *        disclaimer.
  20  *
  21  *      - Redistributions in binary form must reproduce the above
  22  *        copyright notice, this list of conditions and the following
  23  *        disclaimer in the documentation and/or other materials
  24  *        provided with the distribution.
  25  *
  26  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  27  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  28  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  29  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  30  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  31  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  32  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  33  * SOFTWARE.
  34  *
  35  */
  36 #include <linux/dma-mapping.h>
  37 #include <linux/slab.h>
  38 #include <linux/module.h>
  39 #include <rdma/ib_cache.h>
  40
  41 #include "mad_priv.h"
  42 #include "mad_rmpp.h"
  43 #include "smi.h"
  44 #include "agent.h"
  45
  46 MODULE_LICENSE("Dual BSD/GPL");
  47 MODULE_DESCRIPTION("kernel IB MAD API");
  48 MODULE_AUTHOR("Hal Rosenstock");
  49 MODULE_AUTHOR("Sean Hefty");
  50
  51 static int mad_sendq_size = IB_MAD_QP_SEND_SIZE;
  52 static int mad_recvq_size = IB_MAD_QP_RECV_SIZE;
  53
  54 module_param_named(send_queue_size, mad_sendq_size, int, 0444);
  55 MODULE_PARM_DESC(send_queue_size, "Size of send queue in number of work requests");
  56 module_param_named(recv_queue_size, mad_recvq_size, int, 0444);
  57 MODULE_PARM_DESC(recv_queue_size, "Size of receive queue in number of work requests");
  58
  59 static struct kmem_cache *ib_mad_cache;
  60
  61 static struct list_head ib_mad_port_list;
  62 static u32 ib_mad_client_id = 0;
  63
  64 /* Port list lock */
  65 static DEFINE_SPINLOCK(ib_mad_port_list_lock);
  66
  67 /* Forward declarations */
  68 static int method_in_use(struct ib_mad_mgmt_method_table **method,
  69                          struct ib_mad_reg_req *mad_reg_req);
  70 static void remove_mad_reg_req(struct ib_mad_agent_private *priv);
  71 static struct ib_mad_agent_private *find_mad_agent(
  72                                         struct ib_mad_port_private *port_priv,
  73                                         struct ib_mad *mad);
  74 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
  75                                     struct ib_mad_private *mad);
  76 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv);
  77 static void timeout_sends(struct work_struct *work);
  78 static void local_completions(struct work_struct *work);
  79 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
  80                               struct ib_mad_agent_private *agent_priv,
  81                               u8 mgmt_class);
  82 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
  83                            struct ib_mad_agent_private *agent_priv);
  84
  85 /*
  86  * Returns a ib_mad_port_private structure or NULL for a device/port
  87  * Assumes ib_mad_port_list_lock is being held
  88  */
  89 static inline struct ib_mad_port_private *
  90 __ib_get_mad_port(struct ib_device *device, int port_num)
  91 {
  92         struct ib_mad_port_private *entry;
  93
  94         list_for_each_entry(entry, &ib_mad_port_list, port_list) {
  95                 if (entry->device == device && entry->port_num == port_num)
  96                         return entry;
  97         }
  98         return NULL;
  99 }
 100
 101 /*
 102  * Wrapper function to return a ib_mad_port_private structure or NULL
 103  * for a device/port
 104  */
 105 static inline struct ib_mad_port_private *
 106 ib_get_mad_port(struct ib_device *device, int port_num)
 107 {
 108         struct ib_mad_port_private *entry;
 109         unsigned long flags;
 110
 111         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
 112         entry = __ib_get_mad_port(device, port_num);
 113         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
 114
 115         return entry;
 116 }
 117
 118 static inline u8 convert_mgmt_class(u8 mgmt_class)
 119 {
 120         /* Alias IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE to 0 */
 121         return mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE ?
 122                 0 : mgmt_class;
 123 }
 124
 125 static int get_spl_qp_index(enum ib_qp_type qp_type)
 126 {
 127         switch (qp_type)
 128         {
 129         case IB_QPT_SMI:
 130                 return 0;
 131         case IB_QPT_GSI:
 132                 return 1;
 133         default:
 134                 return -1;
 135         }
 136 }
 137
 138 static int vendor_class_index(u8 mgmt_class)
 139 {
 140         return mgmt_class - IB_MGMT_CLASS_VENDOR_RANGE2_START;
 141 }
 142
 143 static int is_vendor_class(u8 mgmt_class)
 144 {
 145         if ((mgmt_class < IB_MGMT_CLASS_VENDOR_RANGE2_START) ||
 146             (mgmt_class > IB_MGMT_CLASS_VENDOR_RANGE2_END))
 147                 return 0;
 148         return 1;
 149 }
 150
 151 static int is_vendor_oui(char *oui)
 152 {
 153         if (oui[0] || oui[1] || oui[2])
 154                 return 1;
 155         return 0;
 156 }
 157
 158 static int is_vendor_method_in_use(
 159                 struct ib_mad_mgmt_vendor_class *vendor_class,
 160                 struct ib_mad_reg_req *mad_reg_req)
 161 {
 162         struct ib_mad_mgmt_method_table *method;
 163         int i;
 164
 165         for (i = 0; i < MAX_MGMT_OUI; i++) {
 166                 if (!memcmp(vendor_class->oui[i], mad_reg_req->oui, 3)) {
 167                         method = vendor_class->method_table[i];
 168                         if (method) {
 169                                 if (method_in_use(&method, mad_reg_req))
 170                                         return 1;
 171                                 else
 172                                         break;
 173                         }
 174                 }
 175         }
 176         return 0;
 177 }
 178
 179 int ib_response_mad(struct ib_mad *mad)
 180 {
 181         return ((mad->mad_hdr.method & IB_MGMT_METHOD_RESP) ||
 182                 (mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS) ||
 183                 ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_BM) &&
 184                  (mad->mad_hdr.attr_mod & IB_BM_ATTR_MOD_RESP)));
 185 }
 186 EXPORT_SYMBOL(ib_response_mad);
 187
 188 /*
 189  * ib_register_mad_agent - Register to send/receive MADs
 190  */
 191 struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
 192                                            u8 port_num,
 193                                            enum ib_qp_type qp_type,
 194                                            struct ib_mad_reg_req *mad_reg_req,
 195                                            u8 rmpp_version,
 196                                            ib_mad_send_handler send_handler,
 197                                            ib_mad_recv_handler recv_handler,
 198                                            void *context)
 199 {
 200         struct ib_mad_port_private *port_priv;
 201         struct ib_mad_agent *ret = ERR_PTR(-EINVAL);
 202         struct ib_mad_agent_private *mad_agent_priv;
 203         struct ib_mad_reg_req *reg_req = NULL;
 204         struct ib_mad_mgmt_class_table *class;
 205         struct ib_mad_mgmt_vendor_class_table *vendor;
 206         struct ib_mad_mgmt_vendor_class *vendor_class;
 207         struct ib_mad_mgmt_method_table *method;
 208         int ret2, qpn;
 209         unsigned long flags;
 210         u8 mgmt_class, vclass;
 211
 212         /* Validate parameters */
 213         qpn = get_spl_qp_index(qp_type);
 214         if (qpn == -1)
 215                 goto error1;
 216
 217         if (rmpp_version && rmpp_version != IB_MGMT_RMPP_VERSION)
 218                 goto error1;
 219
 220         /* Validate MAD registration request if supplied */
 221         if (mad_reg_req) {
 222                 if (mad_reg_req->mgmt_class_version >= MAX_MGMT_VERSION)
 223                         goto error1;
 224                 if (!recv_handler)
 225                         goto error1;
 226                 if (mad_reg_req->mgmt_class >= MAX_MGMT_CLASS) {
 227                         /*
 228                          * IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE is the only
 229                          * one in this range currently allowed
 230                          */
 231                         if (mad_reg_req->mgmt_class !=
 232                             IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
 233                                 goto error1;
 234                 } else if (mad_reg_req->mgmt_class == 0) {
 235                         /*
 236                          * Class 0 is reserved in IBA and is used for
 237                          * aliasing of IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE
 238                          */
 239                         goto error1;
 240                 } else if (is_vendor_class(mad_reg_req->mgmt_class)) {
 241                         /*
 242                          * If class is in "new" vendor range,
 243                          * ensure supplied OUI is not zero
 244                          */
 245                         if (!is_vendor_oui(mad_reg_req->oui))
 246                                 goto error1;
 247                 }
 248                 /* Make sure class supplied is consistent with RMPP */
 249                 if (!ib_is_mad_class_rmpp(mad_reg_req->mgmt_class)) {
 250                         if (rmpp_version)
 251                                 goto error1;
 252                 }
 253                 /* Make sure class supplied is consistent with QP type */
 254                 if (qp_type == IB_QPT_SMI) {
 255                         if ((mad_reg_req->mgmt_class !=
 256                                         IB_MGMT_CLASS_SUBN_LID_ROUTED) &&
 257                             (mad_reg_req->mgmt_class !=
 258                                         IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
 259                                 goto error1;
 260                 } else {
 261                         if ((mad_reg_req->mgmt_class ==
 262                                         IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
 263                             (mad_reg_req->mgmt_class ==
 264                                         IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
 265                                 goto error1;
 266                 }
 267         } else {
 268                 /* No registration request supplied */
 269                 if (!send_handler)
 270                         goto error1;
 271         }
 272
 273         /* Validate device and port */
 274         port_priv = ib_get_mad_port(device, port_num);
 275         if (!port_priv) {
 276                 ret = ERR_PTR(-ENODEV);
 277                 goto error1;
 278         }
 279
 280         /* Verify the QP requested is supported.  For example, Ethernet devices
 281          * will not have QP0 */
 282         if (!port_priv->qp_info[qpn].qp) {
 283                 ret = ERR_PTR(-EPROTONOSUPPORT);
 284                 goto error1;
 285         }
 286
 287         /* Allocate structures */
 288         mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL);
 289         if (!mad_agent_priv) {
 290                 ret = ERR_PTR(-ENOMEM);
 291                 goto error1;
 292         }
 293
 294         mad_agent_priv->agent.mr = ib_get_dma_mr(port_priv->qp_info[qpn].qp->pd,
 295                                                  IB_ACCESS_LOCAL_WRITE);
 296         if (IS_ERR(mad_agent_priv->agent.mr)) {
 297                 ret = ERR_PTR(-ENOMEM);
 298                 goto error2;
 299         }
 300
 301         if (mad_reg_req) {
 302                 reg_req = kmemdup(mad_reg_req, sizeof *reg_req, GFP_KERNEL);
 303                 if (!reg_req) {
 304                         ret = ERR_PTR(-ENOMEM);
 305                         goto error3;
 306                 }
 307         }
 308
 309         /* Now, fill in the various structures */
 310         mad_agent_priv->qp_info = &port_priv->qp_info[qpn];
 311         mad_agent_priv->reg_req = reg_req;
 312         mad_agent_priv->agent.rmpp_version = rmpp_version;
 313         mad_agent_priv->agent.device = device;
 314         mad_agent_priv->agent.recv_handler = recv_handler;
 315         mad_agent_priv->agent.send_handler = send_handler;
 316         mad_agent_priv->agent.context = context;
 317         mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp;
 318         mad_agent_priv->agent.port_num = port_num;
 319         spin_lock_init(&mad_agent_priv->lock);
 320         INIT_LIST_HEAD(&mad_agent_priv->send_list);
 321         INIT_LIST_HEAD(&mad_agent_priv->wait_list);
 322         INIT_LIST_HEAD(&mad_agent_priv->done_list);
 323         INIT_LIST_HEAD(&mad_agent_priv->rmpp_list);
 324         INIT_DELAYED_WORK(&mad_agent_priv->timed_work, timeout_sends);
 325         INIT_LIST_HEAD(&mad_agent_priv->local_list);
 326         INIT_WORK(&mad_agent_priv->local_work, local_completions);
 327         atomic_set(&mad_agent_priv->refcount, 1);
 328         init_completion(&mad_agent_priv->comp);
 329
 330         spin_lock_irqsave(&port_priv->reg_lock, flags);
 331         mad_agent_priv->agent.hi_tid = ++ib_mad_client_id;
 332
 333         /*
 334          * Make sure MAD registration (if supplied)
 335          * is non overlapping with any existing ones
 336          */
 337         if (mad_reg_req) {
 338                 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class);
 339                 if (!is_vendor_class(mgmt_class)) {
 340                         class = port_priv->version[mad_reg_req->
 341                                                    mgmt_class_version].class;
 342                         if (class) {
 343                                 method = class->method_table[mgmt_class];
 344                                 if (method) {
 345                                         if (method_in_use(&method,
 346                                                            mad_reg_req))
 347                                                 goto error4;
 348                                 }
 349                         }
 350                         ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv,
 351                                                   mgmt_class);
 352                 } else {
 353                         /* "New" vendor class range */
 354                         vendor = port_priv->version[mad_reg_req->
 355                                                     mgmt_class_version].vendor;
 356                         if (vendor) {
 357                                 vclass = vendor_class_index(mgmt_class);
 358                                 vendor_class = vendor->vendor_class[vclass];
 359                                 if (vendor_class) {
 360                                         if (is_vendor_method_in_use(
 361                                                         vendor_class,
 362                                                         mad_reg_req))
 363                                                 goto error4;
 364                                 }
 365                         }
 366                         ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv);
 367                 }
 368                 if (ret2) {
 369                         ret = ERR_PTR(ret2);
 370                         goto error4;
 371                 }
 372         }
 373
 374         /* Add mad agent into port's agent list */
 375         list_add_tail(&mad_agent_priv->agent_list, &port_priv->agent_list);
 376         spin_unlock_irqrestore(&port_priv->reg_lock, flags);
 377
 378         return &mad_agent_priv->agent;
 379
 380 error4:
 381         spin_unlock_irqrestore(&port_priv->reg_lock, flags);
 382         kfree(reg_req);
 383 error3:
 384         ib_dereg_mr(mad_agent_priv->agent.mr);
 385 error2:
 386         kfree(mad_agent_priv);
 387 error1:
 388         return ret;
 389 }
 390 EXPORT_SYMBOL(ib_register_mad_agent);
 391
 392 static inline int is_snooping_sends(int mad_snoop_flags)
 393 {
 394         return (mad_snoop_flags &
 395                 (/*IB_MAD_SNOOP_POSTED_SENDS |
 396                  IB_MAD_SNOOP_RMPP_SENDS |*/
 397                  IB_MAD_SNOOP_SEND_COMPLETIONS /*|
 398                  IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS*/));
 399 }
 400
 401 static inline int is_snooping_recvs(int mad_snoop_flags)
 402 {
 403         return (mad_snoop_flags &
 404                 (IB_MAD_SNOOP_RECVS /*|
 405                  IB_MAD_SNOOP_RMPP_RECVS*/));
 406 }
 407
 408 static int register_snoop_agent(struct ib_mad_qp_info *qp_info,
 409                                 struct ib_mad_snoop_private *mad_snoop_priv)
 410 {
 411         struct ib_mad_snoop_private **new_snoop_table;
 412         unsigned long flags;
 413         int i;
 414
 415         spin_lock_irqsave(&qp_info->snoop_lock, flags);
 416         /* Check for empty slot in array. */
 417         for (i = 0; i < qp_info->snoop_table_size; i++)
 418                 if (!qp_info->snoop_table[i])
 419                         break;
 420
 421         if (i == qp_info->snoop_table_size) {
 422                 /* Grow table. */
 423                 new_snoop_table = krealloc(qp_info->snoop_table,
 424                                            sizeof mad_snoop_priv *
 425                                            (qp_info->snoop_table_size + 1),
 426                                            GFP_ATOMIC);
 427                 if (!new_snoop_table) {
 428                         i = -ENOMEM;
 429                         goto out;
 430                 }
 431
 432                 qp_info->snoop_table = new_snoop_table;
 433                 qp_info->snoop_table_size++;
 434         }
 435         qp_info->snoop_table[i] = mad_snoop_priv;
 436         atomic_inc(&qp_info->snoop_count);
 437 out:
 438         spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 439         return i;
 440 }
 441
 442 struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device,
 443                                            u8 port_num,
 444                                            enum ib_qp_type qp_type,
 445                                            int mad_snoop_flags,
 446                                            ib_mad_snoop_handler snoop_handler,
 447                                            ib_mad_recv_handler recv_handler,
 448                                            void *context)
 449 {
 450         struct ib_mad_port_private *port_priv;
 451         struct ib_mad_agent *ret;
 452         struct ib_mad_snoop_private *mad_snoop_priv;
 453         int qpn;
 454
 455         /* Validate parameters */
 456         if ((is_snooping_sends(mad_snoop_flags) && !snoop_handler) ||
 457             (is_snooping_recvs(mad_snoop_flags) && !recv_handler)) {
 458                 ret = ERR_PTR(-EINVAL);
 459                 goto error1;
 460         }
 461         qpn = get_spl_qp_index(qp_type);
 462         if (qpn == -1) {
 463                 ret = ERR_PTR(-EINVAL);
 464                 goto error1;
 465         }
 466         port_priv = ib_get_mad_port(device, port_num);
 467         if (!port_priv) {
 468                 ret = ERR_PTR(-ENODEV);
 469                 goto error1;
 470         }
 471         /* Allocate structures */
 472         mad_snoop_priv = kzalloc(sizeof *mad_snoop_priv, GFP_KERNEL);
 473         if (!mad_snoop_priv) {
 474                 ret = ERR_PTR(-ENOMEM);
 475                 goto error1;
 476         }
 477
 478         /* Now, fill in the various structures */
 479         mad_snoop_priv->qp_info = &port_priv->qp_info[qpn];
 480         mad_snoop_priv->agent.device = device;
 481         mad_snoop_priv->agent.recv_handler = recv_handler;
 482         mad_snoop_priv->agent.snoop_handler = snoop_handler;
 483         mad_snoop_priv->agent.context = context;
 484         mad_snoop_priv->agent.qp = port_priv->qp_info[qpn].qp;
 485         mad_snoop_priv->agent.port_num = port_num;
 486         mad_snoop_priv->mad_snoop_flags = mad_snoop_flags;
 487         init_completion(&mad_snoop_priv->comp);
 488         mad_snoop_priv->snoop_index = register_snoop_agent(
 489                                                 &port_priv->qp_info[qpn],
 490                                                 mad_snoop_priv);
 491         if (mad_snoop_priv->snoop_index < 0) {
 492                 ret = ERR_PTR(mad_snoop_priv->snoop_index);
 493                 goto error2;
 494         }
 495
 496         atomic_set(&mad_snoop_priv->refcount, 1);
 497         return &mad_snoop_priv->agent;
 498
 499 error2:
 500         kfree(mad_snoop_priv);
 501 error1:
 502         return ret;
 503 }
 504 EXPORT_SYMBOL(ib_register_mad_snoop);
 505
 506 static inline void deref_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
 507 {
 508         if (atomic_dec_and_test(&mad_agent_priv->refcount))
 509                 complete(&mad_agent_priv->comp);
 510 }
 511
 512 static inline void deref_snoop_agent(struct ib_mad_snoop_private *mad_snoop_priv)
 513 {
 514         if (atomic_dec_and_test(&mad_snoop_priv->refcount))
 515                 complete(&mad_snoop_priv->comp);
 516 }
 517
 518 static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
 519 {
 520         struct ib_mad_port_private *port_priv;
 521         unsigned long flags;
 522
 523         /* Note that we could still be handling received MADs */
 524
 525         /*
 526          * Canceling all sends results in dropping received response
 527          * MADs, preventing us from queuing additional work
 528          */
 529         cancel_mads(mad_agent_priv);
 530         port_priv = mad_agent_priv->qp_info->port_priv;
 531         cancel_delayed_work(&mad_agent_priv->timed_work);
 532
 533         spin_lock_irqsave(&port_priv->reg_lock, flags);
 534         remove_mad_reg_req(mad_agent_priv);
 535         list_del(&mad_agent_priv->agent_list);
 536         spin_unlock_irqrestore(&port_priv->reg_lock, flags);
 537
 538         flush_workqueue(port_priv->wq);
 539         ib_cancel_rmpp_recvs(mad_agent_priv);
 540
 541         deref_mad_agent(mad_agent_priv);
 542         wait_for_completion(&mad_agent_priv->comp);
 543
 544         kfree(mad_agent_priv->reg_req);
 545         ib_dereg_mr(mad_agent_priv->agent.mr);
 546         kfree(mad_agent_priv);
 547 }
 548
 549 static void unregister_mad_snoop(struct ib_mad_snoop_private *mad_snoop_priv)
 550 {
 551         struct ib_mad_qp_info *qp_info;
 552         unsigned long flags;
 553
 554         qp_info = mad_snoop_priv->qp_info;
 555         spin_lock_irqsave(&qp_info->snoop_lock, flags);
 556         qp_info->snoop_table[mad_snoop_priv->snoop_index] = NULL;
 557         atomic_dec(&qp_info->snoop_count);
 558         spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 559
 560         deref_snoop_agent(mad_snoop_priv);
 561         wait_for_completion(&mad_snoop_priv->comp);
 562
 563         kfree(mad_snoop_priv);
 564 }
 565
 566 /*
 567  * ib_unregister_mad_agent - Unregisters a client from using MAD services
 568  */
 569 int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent)
 570 {
 571         struct ib_mad_agent_private *mad_agent_priv;
 572         struct ib_mad_snoop_private *mad_snoop_priv;
 573
 574         /* If the TID is zero, the agent can only snoop. */
 575         if (mad_agent->hi_tid) {
 576                 mad_agent_priv = container_of(mad_agent,
 577                                               struct ib_mad_agent_private,
 578                                               agent);
 579                 unregister_mad_agent(mad_agent_priv);
 580         } else {
 581                 mad_snoop_priv = container_of(mad_agent,
 582                                               struct ib_mad_snoop_private,
 583                                               agent);
 584                 unregister_mad_snoop(mad_snoop_priv);
 585         }
 586         return 0;
 587 }
 588 EXPORT_SYMBOL(ib_unregister_mad_agent);
 589
 590 static void dequeue_mad(struct ib_mad_list_head *mad_list)
 591 {
 592         struct ib_mad_queue *mad_queue;
 593         unsigned long flags;
 594
 595         BUG_ON(!mad_list->mad_queue);
 596         mad_queue = mad_list->mad_queue;
 597         spin_lock_irqsave(&mad_queue->lock, flags);
 598         list_del(&mad_list->list);
 599         mad_queue->count--;
 600         spin_unlock_irqrestore(&mad_queue->lock, flags);
 601 }
 602
 603 static void snoop_send(struct ib_mad_qp_info *qp_info,
 604                        struct ib_mad_send_buf *send_buf,
 605                        struct ib_mad_send_wc *mad_send_wc,
 606                        int mad_snoop_flags)
 607 {
 608         struct ib_mad_snoop_private *mad_snoop_priv;
 609         unsigned long flags;
 610         int i;
 611
 612         spin_lock_irqsave(&qp_info->snoop_lock, flags);
 613         for (i = 0; i < qp_info->snoop_table_size; i++) {
 614                 mad_snoop_priv = qp_info->snoop_table[i];
 615                 if (!mad_snoop_priv ||
 616                     !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
 617                         continue;
 618
 619                 atomic_inc(&mad_snoop_priv->refcount);
 620                 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 621                 mad_snoop_priv->agent.snoop_handler(&mad_snoop_priv->agent,
 622                                                     send_buf, mad_send_wc);
 623                 deref_snoop_agent(mad_snoop_priv);
 624                 spin_lock_irqsave(&qp_info->snoop_lock, flags);
 625         }
 626         spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 627 }
 628
 629 static void snoop_recv(struct ib_mad_qp_info *qp_info,
 630                        struct ib_mad_recv_wc *mad_recv_wc,
 631                        int mad_snoop_flags)
 632 {
 633         struct ib_mad_snoop_private *mad_snoop_priv;
 634         unsigned long flags;
 635         int i;
 636
 637         spin_lock_irqsave(&qp_info->snoop_lock, flags);
 638         for (i = 0; i < qp_info->snoop_table_size; i++) {
 639                 mad_snoop_priv = qp_info->snoop_table[i];
 640                 if (!mad_snoop_priv ||
 641                     !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
 642                         continue;
 643
 644                 atomic_inc(&mad_snoop_priv->refcount);
 645                 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 646                 mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent,
 647                                                    mad_recv_wc);
 648                 deref_snoop_agent(mad_snoop_priv);
 649                 spin_lock_irqsave(&qp_info->snoop_lock, flags);
 650         }
 651         spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 652 }
 653
 654 static void build_smp_wc(struct ib_qp *qp,
 655                          u64 wr_id, u16 slid, u16 pkey_index, u8 port_num,
 656                          struct ib_wc *wc)
 657 {
 658         memset(wc, 0, sizeof *wc);
 659         wc->wr_id = wr_id;
 660         wc->status = IB_WC_SUCCESS;
 661         wc->opcode = IB_WC_RECV;
 662         wc->pkey_index = pkey_index;
 663         wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh);
 664         wc->src_qp = IB_QP0;
 665         wc->qp = qp;
 666         wc->slid = slid;
 667         wc->sl = 0;
 668         wc->dlid_path_bits = 0;
 669         wc->port_num = port_num;
 670 }
 671
 672 /*
 673  * Return 0 if SMP is to be sent
 674  * Return 1 if SMP was consumed locally (whether or not solicited)
 675  * Return < 0 if error
 676  */
 677 static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv,
 678                                   struct ib_mad_send_wr_private *mad_send_wr)
 679 {
 680         int ret = 0;
 681         struct ib_smp *smp = mad_send_wr->send_buf.mad;
 682         unsigned long flags;
 683         struct ib_mad_local_private *local;
 684         struct ib_mad_private *mad_priv;
 685         struct ib_mad_port_private *port_priv;
 686         struct ib_mad_agent_private *recv_mad_agent = NULL;
 687         struct ib_device *device = mad_agent_priv->agent.device;
 688         u8 port_num;
 689         struct ib_wc mad_wc;
 690         struct ib_send_wr *send_wr = &mad_send_wr->send_wr;
 691
 692         if (device->node_type == RDMA_NODE_IB_SWITCH &&
 693             smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
 694                 port_num = send_wr->wr.ud.port_num;
 695         else
 696                 port_num = mad_agent_priv->agent.port_num;
 697
 698         /*
 699          * Directed route handling starts if the initial LID routed part of
 700          * a request or the ending LID routed part of a response is empty.
 701          * If we are at the start of the LID routed part, don't update the
 702          * hop_ptr or hop_cnt.  See section 14.2.2, Vol 1 IB spec.
 703          */
 704         if ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) ==
 705              IB_LID_PERMISSIVE &&
 706              smi_handle_dr_smp_send(smp, device->node_type, port_num) ==
 707              IB_SMI_DISCARD) {
 708                 ret = -EINVAL;
 709                 printk(KERN_ERR PFX "Invalid directed route\n");
 710                 goto out;
 711         }
 712
 713         /* Check to post send on QP or process locally */
 714         if (smi_check_local_smp(smp, device) == IB_SMI_DISCARD &&
 715             smi_check_local_returning_smp(smp, device) == IB_SMI_DISCARD)
 716                 goto out;
 717
 718         local = kmalloc(sizeof *local, GFP_ATOMIC);
 719         if (!local) {
 720                 ret = -ENOMEM;
 721                 printk(KERN_ERR PFX "No memory for ib_mad_local_private\n");
 722                 goto out;
 723         }
 724         local->mad_priv = NULL;
 725         local->recv_mad_agent = NULL;
 726         mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_ATOMIC);
 727         if (!mad_priv) {
 728                 ret = -ENOMEM;
 729                 printk(KERN_ERR PFX "No memory for local response MAD\n");
 730                 kfree(local);
 731                 goto out;
 732         }
 733
 734         build_smp_wc(mad_agent_priv->agent.qp,
 735                      send_wr->wr_id, be16_to_cpu(smp->dr_slid),
 736                      send_wr->wr.ud.pkey_index,
 737                      send_wr->wr.ud.port_num, &mad_wc);
 738
 739         /* No GRH for DR SMP */
 740         ret = device->process_mad(device, 0, port_num, &mad_wc, NULL,
 741                                   (struct ib_mad *)smp,
 742                                   (struct ib_mad *)&mad_priv->mad);
 743         switch (ret)
 744         {
 745         case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
 746                 if (ib_response_mad(&mad_priv->mad.mad) &&
 747                     mad_agent_priv->agent.recv_handler) {
 748                         local->mad_priv = mad_priv;
 749                         local->recv_mad_agent = mad_agent_priv;
 750                         /*
 751                          * Reference MAD agent until receive
 752                          * side of local completion handled
 753                          */
 754                         atomic_inc(&mad_agent_priv->refcount);
 755                 } else
 756                         kmem_cache_free(ib_mad_cache, mad_priv);
 757                 break;
 758         case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
 759                 kmem_cache_free(ib_mad_cache, mad_priv);
 760                 break;
 761         case IB_MAD_RESULT_SUCCESS:
 762                 /* Treat like an incoming receive MAD */
 763                 port_priv = ib_get_mad_port(mad_agent_priv->agent.device,
 764                                             mad_agent_priv->agent.port_num);
 765                 if (port_priv) {
 766                         memcpy(&mad_priv->mad.mad, smp, sizeof(struct ib_mad));
 767                         recv_mad_agent = find_mad_agent(port_priv,
 768                                                         &mad_priv->mad.mad);
 769                 }
 770                 if (!port_priv || !recv_mad_agent) {
 771                         /*
 772                          * No receiving agent so drop packet and
 773                          * generate send completion.
 774                          */
 775                         kmem_cache_free(ib_mad_cache, mad_priv);
 776                         break;
 777                 }
 778                 local->mad_priv = mad_priv;
 779                 local->recv_mad_agent = recv_mad_agent;
 780                 break;
 781         default:
 782                 kmem_cache_free(ib_mad_cache, mad_priv);
 783                 kfree(local);
 784                 ret = -EINVAL;
 785                 goto out;
 786         }
 787
 788         local->mad_send_wr = mad_send_wr;
 789         /* Reference MAD agent until send side of local completion handled */
 790         atomic_inc(&mad_agent_priv->refcount);
 791         /* Queue local completion to local list */
 792         spin_lock_irqsave(&mad_agent_priv->lock, flags);
 793         list_add_tail(&local->completion_list, &mad_agent_priv->local_list);
 794         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
 795         queue_work(mad_agent_priv->qp_info->port_priv->wq,
 796                    &mad_agent_priv->local_work);
 797         ret = 1;
 798 out:
 799         return ret;
 800 }
 801
 802 static int get_pad_size(int hdr_len, int data_len)
 803 {
 804         int seg_size, pad;
 805
 806         seg_size = sizeof(struct ib_mad) - hdr_len;
 807         if (data_len && seg_size) {
 808                 pad = seg_size - data_len % seg_size;
 809                 return pad == seg_size ? 0 : pad;
 810         } else
 811                 return seg_size;
 812 }
 813
 814 static void free_send_rmpp_list(struct ib_mad_send_wr_private *mad_send_wr)
 815 {
 816         struct ib_rmpp_segment *s, *t;
 817
 818         list_for_each_entry_safe(s, t, &mad_send_wr->rmpp_list, list) {
 819                 list_del(&s->list);
 820                 kfree(s);
 821         }
 822 }
 823
 824 static int alloc_send_rmpp_list(struct ib_mad_send_wr_private *send_wr,
 825                                 gfp_t gfp_mask)
 826 {
 827         struct ib_mad_send_buf *send_buf = &send_wr->send_buf;
 828         struct ib_rmpp_mad *rmpp_mad = send_buf->mad;
 829         struct ib_rmpp_segment *seg = NULL;
 830         int left, seg_size, pad;
 831
 832         send_buf->seg_size = sizeof (struct ib_mad) - send_buf->hdr_len;
 833         seg_size = send_buf->seg_size;
 834         pad = send_wr->pad;
 835
 836         /* Allocate data segments. */
 837         for (left = send_buf->data_len + pad; left > 0; left -= seg_size) {
 838                 seg = kmalloc(sizeof (*seg) + seg_size, gfp_mask);
 839                 if (!seg) {
 840                         printk(KERN_ERR "alloc_send_rmpp_segs: RMPP mem "
 841                                "alloc failed for len %zd, gfp %#x\n",
 842                                sizeof (*seg) + seg_size, gfp_mask);
 843                         free_send_rmpp_list(send_wr);
 844                         return -ENOMEM;
 845                 }
 846                 seg->num = ++send_buf->seg_count;
 847                 list_add_tail(&seg->list, &send_wr->rmpp_list);
 848         }
 849
 850         /* Zero any padding */
 851         if (pad)
 852                 memset(seg->data + seg_size - pad, 0, pad);
 853
 854         rmpp_mad->rmpp_hdr.rmpp_version = send_wr->mad_agent_priv->
 855                                           agent.rmpp_version;
 856         rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA;
 857         ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
 858
 859         send_wr->cur_seg = container_of(send_wr->rmpp_list.next,
 860                                         struct ib_rmpp_segment, list);
 861         send_wr->last_ack_seg = send_wr->cur_seg;
 862         return 0;
 863 }
 864
 865 struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
 866                                             u32 remote_qpn, u16 pkey_index,
 867                                             int rmpp_active,
 868                                             int hdr_len, int data_len,
 869                                             gfp_t gfp_mask)
 870 {
 871         struct ib_mad_agent_private *mad_agent_priv;
 872         struct ib_mad_send_wr_private *mad_send_wr;
 873         int pad, message_size, ret, size;
 874         void *buf;
 875
 876         mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
 877                                       agent);
 878         pad = get_pad_size(hdr_len, data_len);
 879         message_size = hdr_len + data_len + pad;
 880
 881         if ((!mad_agent->rmpp_version &&
 882              (rmpp_active || message_size > sizeof(struct ib_mad))) ||
 883             (!rmpp_active && message_size > sizeof(struct ib_mad)))
 884                 return ERR_PTR(-EINVAL);
 885
 886         size = rmpp_active ? hdr_len : sizeof(struct ib_mad);
 887         buf = kzalloc(sizeof *mad_send_wr + size, gfp_mask);
 888         if (!buf)
 889                 return ERR_PTR(-ENOMEM);
 890
 891         mad_send_wr = buf + size;
 892         INIT_LIST_HEAD(&mad_send_wr->rmpp_list);
 893         mad_send_wr->send_buf.mad = buf;
 894         mad_send_wr->send_buf.hdr_len = hdr_len;
 895         mad_send_wr->send_buf.data_len = data_len;
 896         mad_send_wr->pad = pad;
 897
 898         mad_send_wr->mad_agent_priv = mad_agent_priv;
 899         mad_send_wr->sg_list[0].length = hdr_len;
 900         mad_send_wr->sg_list[0].lkey = mad_agent->mr->lkey;
 901         mad_send_wr->sg_list[1].length = sizeof(struct ib_mad) - hdr_len;
 902         mad_send_wr->sg_list[1].lkey = mad_agent->mr->lkey;
 903
 904         mad_send_wr->send_wr.wr_id = (unsigned long) mad_send_wr;
 905         mad_send_wr->send_wr.sg_list = mad_send_wr->sg_list;
 906         mad_send_wr->send_wr.num_sge = 2;
 907         mad_send_wr->send_wr.opcode = IB_WR_SEND;
 908         mad_send_wr->send_wr.send_flags = IB_SEND_SIGNALED;
 909         mad_send_wr->send_wr.wr.ud.remote_qpn = remote_qpn;
 910         mad_send_wr->send_wr.wr.ud.remote_qkey = IB_QP_SET_QKEY;
 911         mad_send_wr->send_wr.wr.ud.pkey_index = pkey_index;
 912
 913         if (rmpp_active) {
 914                 ret = alloc_send_rmpp_list(mad_send_wr, gfp_mask);
 915                 if (ret) {
 916                         kfree(buf);
 917                         return ERR_PTR(ret);
 918                 }
 919         }
 920
 921         mad_send_wr->send_buf.mad_agent = mad_agent;
 922         atomic_inc(&mad_agent_priv->refcount);
 923         return &mad_send_wr->send_buf;
 924 }
 925 EXPORT_SYMBOL(ib_create_send_mad);
 926
 927 int ib_get_mad_data_offset(u8 mgmt_class)
 928 {
 929         if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM)
 930                 return IB_MGMT_SA_HDR;
 931         else if ((mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
 932                  (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
 933                  (mgmt_class == IB_MGMT_CLASS_BIS))
 934                 return IB_MGMT_DEVICE_HDR;
 935         else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
 936                  (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))
 937                 return IB_MGMT_VENDOR_HDR;
 938         else
 939                 return IB_MGMT_MAD_HDR;
 940 }
 941 EXPORT_SYMBOL(ib_get_mad_data_offset);
 942
 943 int ib_is_mad_class_rmpp(u8 mgmt_class)
 944 {
 945         if ((mgmt_class == IB_MGMT_CLASS_SUBN_ADM) ||
 946             (mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
 947             (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
 948             (mgmt_class == IB_MGMT_CLASS_BIS) ||
 949             ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
 950              (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)))
 951                 return 1;
 952         return 0;
 953 }
 954 EXPORT_SYMBOL(ib_is_mad_class_rmpp);
 955
 956 void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num)
 957 {
 958         struct ib_mad_send_wr_private *mad_send_wr;
 959         struct list_head *list;
 960
 961         mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
 962                                    send_buf);
 963         list = &mad_send_wr->cur_seg->list;
 964
 965         if (mad_send_wr->cur_seg->num < seg_num) {
 966                 list_for_each_entry(mad_send_wr->cur_seg, list, list)
 967                         if (mad_send_wr->cur_seg->num == seg_num)
 968                                 break;
 969         } else if (mad_send_wr->cur_seg->num > seg_num) {
 970                 list_for_each_entry_reverse(mad_send_wr->cur_seg, list, list)
 971                         if (mad_send_wr->cur_seg->num == seg_num)
 972                                 break;
 973         }
 974         return mad_send_wr->cur_seg->data;
 975 }
 976 EXPORT_SYMBOL(ib_get_rmpp_segment);
 977
 978 static inline void *ib_get_payload(struct ib_mad_send_wr_private *mad_send_wr)
 979 {
 980         if (mad_send_wr->send_buf.seg_count)
 981                 return ib_get_rmpp_segment(&mad_send_wr->send_buf,
 982                                            mad_send_wr->seg_num);
 983         else
 984                 return mad_send_wr->send_buf.mad +
 985                        mad_send_wr->send_buf.hdr_len;
 986 }
 987
 988 void ib_free_send_mad(struct ib_mad_send_buf *send_buf)
 989 {
 990         struct ib_mad_agent_private *mad_agent_priv;
 991         struct ib_mad_send_wr_private *mad_send_wr;
 992
 993         mad_agent_priv = container_of(send_buf->mad_agent,
 994                                       struct ib_mad_agent_private, agent);
 995         mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
 996                                    send_buf);
 997
 998         free_send_rmpp_list(mad_send_wr);
 999         kfree(send_buf->mad);
1000         deref_mad_agent(mad_agent_priv);
1001 }
1002 EXPORT_SYMBOL(ib_free_send_mad);
1003
1004 int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr)
1005 {
1006         struct ib_mad_qp_info *qp_info;
1007         struct list_head *list;
1008         struct ib_send_wr *bad_send_wr;
1009         struct ib_mad_agent *mad_agent;
1010         struct ib_sge *sge;
1011         unsigned long flags;
1012         int ret;
1013
1014         /* Set WR ID to find mad_send_wr upon completion */
1015         qp_info = mad_send_wr->mad_agent_priv->qp_info;
1016         mad_send_wr->send_wr.wr_id = (unsigned long)&mad_send_wr->mad_list;
1017         mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;
1018
1019         mad_agent = mad_send_wr->send_buf.mad_agent;
1020         sge = mad_send_wr->sg_list;
1021         sge[0].addr = ib_dma_map_single(mad_agent->device,
1022                                         mad_send_wr->send_buf.mad,
1023                                         sge[0].length,
1024                                         DMA_TO_DEVICE);
1025         mad_send_wr->header_mapping = sge[0].addr;
1026
1027         sge[1].addr = ib_dma_map_single(mad_agent->device,
1028                                         ib_get_payload(mad_send_wr),
1029                                         sge[1].length,
1030                                         DMA_TO_DEVICE);
1031         mad_send_wr->payload_mapping = sge[1].addr;
1032
1033         spin_lock_irqsave(&qp_info->send_queue.lock, flags);
1034         if (qp_info->send_queue.count < qp_info->send_queue.max_active) {
1035                 ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr,
1036                                    &bad_send_wr);
1037                 list = &qp_info->send_queue.list;
1038         } else {
1039                 ret = 0;
1040                 list = &qp_info->overflow_list;
1041         }
1042
1043         if (!ret) {
1044                 qp_info->send_queue.count++;
1045                 list_add_tail(&mad_send_wr->mad_list.list, list);
1046         }
1047         spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
1048         if (ret) {
1049                 ib_dma_unmap_single(mad_agent->device,
1050                                     mad_send_wr->header_mapping,
1051                                     sge[0].length, DMA_TO_DEVICE);
1052                 ib_dma_unmap_single(mad_agent->device,
1053                                     mad_send_wr->payload_mapping,
1054                                     sge[1].length, DMA_TO_DEVICE);
1055         }
1056         return ret;
1057 }
1058
1059 /*
1060  * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
1061  *  with the registered client
1062  */
1063 int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
1064                      struct ib_mad_send_buf **bad_send_buf)
1065 {
1066         struct ib_mad_agent_private *mad_agent_priv;
1067         struct ib_mad_send_buf *next_send_buf;
1068         struct ib_mad_send_wr_private *mad_send_wr;
1069         unsigned long flags;
1070         int ret = -EINVAL;
1071
1072         /* Walk list of send WRs and post each on send list */
1073         for (; send_buf; send_buf = next_send_buf) {
1074
1075                 mad_send_wr = container_of(send_buf,
1076                                            struct ib_mad_send_wr_private,
1077                                            send_buf);
1078                 mad_agent_priv = mad_send_wr->mad_agent_priv;
1079
1080                 if (!send_buf->mad_agent->send_handler ||
1081                     (send_buf->timeout_ms &&
1082                      !send_buf->mad_agent->recv_handler)) {
1083                         ret = -EINVAL;
1084                         goto error;
1085                 }
1086
1087                 if (!ib_is_mad_class_rmpp(((struct ib_mad_hdr *) send_buf->mad)->mgmt_class)) {
1088                         if (mad_agent_priv->agent.rmpp_version) {
1089                                 ret = -EINVAL;
1090                                 goto error;
1091                         }
1092                 }
1093
1094                 /*
1095                  * Save pointer to next work request to post in case the
1096                  * current one completes, and the user modifies the work
1097                  * request associated with the completion
1098                  */
1099                 next_send_buf = send_buf->next;
1100                 mad_send_wr->send_wr.wr.ud.ah = send_buf->ah;
1101
1102                 if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class ==
1103                     IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1104                         ret = handle_outgoing_dr_smp(mad_agent_priv,
1105                                                      mad_send_wr);
1106                         if (ret < 0)            /* error */
1107                                 goto error;
1108                         else if (ret == 1)      /* locally consumed */
1109                                 continue;
1110                 }
1111
1112                 mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid;
1113                 /* Timeout will be updated after send completes */
1114                 mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms);
1115                 mad_send_wr->max_retries = send_buf->retries;
1116                 mad_send_wr->retries_left = send_buf->retries;
1117                 send_buf->retries = 0;
1118                 /* Reference for work request to QP + response */
1119                 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0);
1120                 mad_send_wr->status = IB_WC_SUCCESS;
1121
1122                 /* Reference MAD agent until send completes */
1123                 atomic_inc(&mad_agent_priv->refcount);
1124                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1125                 list_add_tail(&mad_send_wr->agent_list,
1126                               &mad_agent_priv->send_list);
1127                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1128
1129                 if (mad_agent_priv->agent.rmpp_version) {
1130                         ret = ib_send_rmpp_mad(mad_send_wr);
1131                         if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED)
1132                                 ret = ib_send_mad(mad_send_wr);
1133                 } else
1134                         ret = ib_send_mad(mad_send_wr);
1135                 if (ret < 0) {
1136                         /* Fail send request */
1137                         spin_lock_irqsave(&mad_agent_priv->lock, flags);
1138                         list_del(&mad_send_wr->agent_list);
1139                         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1140                         atomic_dec(&mad_agent_priv->refcount);
1141                         goto error;
1142                 }
1143         }
1144         return 0;
1145 error:
1146         if (bad_send_buf)
1147                 *bad_send_buf = send_buf;
1148         return ret;
1149 }
1150 EXPORT_SYMBOL(ib_post_send_mad);
1151
1152 /*
1153  * ib_free_recv_mad - Returns data buffers used to receive
1154  *  a MAD to the access layer
1155  */
1156 void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc)
1157 {
1158         struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf;
1159         struct ib_mad_private_header *mad_priv_hdr;
1160         struct ib_mad_private *priv;
1161         struct list_head free_list;
1162
1163         INIT_LIST_HEAD(&free_list);
1164         list_splice_init(&mad_recv_wc->rmpp_list, &free_list);
1165
1166         list_for_each_entry_safe(mad_recv_buf, temp_recv_buf,
1167                                         &free_list, list) {
1168                 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc,
1169                                            recv_buf);
1170                 mad_priv_hdr = container_of(mad_recv_wc,
1171                                             struct ib_mad_private_header,
1172                                             recv_wc);
1173                 priv = container_of(mad_priv_hdr, struct ib_mad_private,
1174                                     header);
1175                 kmem_cache_free(ib_mad_cache, priv);
1176         }
1177 }
1178 EXPORT_SYMBOL(ib_free_recv_mad);
1179
1180 struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
1181                                         u8 rmpp_version,
1182                                         ib_mad_send_handler send_handler,
1183                                         ib_mad_recv_handler recv_handler,
1184                                         void *context)
1185 {
1186         return ERR_PTR(-EINVAL);        /* XXX: for now */
1187 }
1188 EXPORT_SYMBOL(ib_redirect_mad_qp);
1189
1190 int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
1191                       struct ib_wc *wc)
1192 {
1193         printk(KERN_ERR PFX "ib_process_mad_wc() not implemented yet\n");
1194         return 0;
1195 }
1196 EXPORT_SYMBOL(ib_process_mad_wc);
1197
1198 static int method_in_use(struct ib_mad_mgmt_method_table **method,
1199                          struct ib_mad_reg_req *mad_reg_req)
1200 {
1201         int i;
1202
1203         for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS) {
1204                 if ((*method)->agent[i]) {
1205                         printk(KERN_ERR PFX "Method %d already in use\n", i);
1206                         return -EINVAL;
1207                 }
1208         }
1209         return 0;
1210 }
1211
1212 static int allocate_method_table(struct ib_mad_mgmt_method_table **method)
1213 {
1214         /* Allocate management method table */
1215         *method = kzalloc(sizeof **method, GFP_ATOMIC);
1216         if (!*method) {
1217                 printk(KERN_ERR PFX "No memory for "
1218                        "ib_mad_mgmt_method_table\n");
1219                 return -ENOMEM;
1220         }
1221
1222         return 0;
1223 }
1224
1225 /*
1226  * Check to see if there are any methods still in use
1227  */
1228 static int check_method_table(struct ib_mad_mgmt_method_table *method)
1229 {
1230         int i;
1231
1232         for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
1233                 if (method->agent[i])
1234                         return 1;
1235         return 0;
1236 }
1237
1238 /*
1239  * Check to see if there are any method tables for this class still in use
1240  */
1241 static int check_class_table(struct ib_mad_mgmt_class_table *class)
1242 {
1243         int i;
1244
1245         for (i = 0; i < MAX_MGMT_CLASS; i++)
1246                 if (class->method_table[i])
1247                         return 1;
1248         return 0;
1249 }
1250
1251 static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class)
1252 {
1253         int i;
1254
1255         for (i = 0; i < MAX_MGMT_OUI; i++)
1256                 if (vendor_class->method_table[i])
1257                         return 1;
1258         return 0;
1259 }
1260
1261 static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class,
1262                            char *oui)
1263 {
1264         int i;
1265
1266         for (i = 0; i < MAX_MGMT_OUI; i++)
1267                 /* Is there matching OUI for this vendor class ? */
1268                 if (!memcmp(vendor_class->oui[i], oui, 3))
1269                         return i;
1270
1271         return -1;
1272 }
1273
1274 static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor)
1275 {
1276         int i;
1277
1278         for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++)
1279                 if (vendor->vendor_class[i])
1280                         return 1;
1281
1282         return 0;
1283 }
1284
1285 static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method,
1286                                      struct ib_mad_agent_private *agent)
1287 {
1288         int i;
1289
1290         /* Remove any methods for this mad agent */
1291         for (i = 0; i < IB_MGMT_MAX_METHODS; i++) {
1292                 if (method->agent[i] == agent) {
1293                         method->agent[i] = NULL;
1294                 }
1295         }
1296 }
1297
1298 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1299                               struct ib_mad_agent_private *agent_priv,
1300                               u8 mgmt_class)
1301 {
1302         struct ib_mad_port_private *port_priv;
1303         struct ib_mad_mgmt_class_table **class;
1304         struct ib_mad_mgmt_method_table **method;
1305         int i, ret;
1306
1307         port_priv = agent_priv->qp_info->port_priv;
1308         class = &port_priv->version[mad_reg_req->mgmt_class_version].class;
1309         if (!*class) {
1310                 /* Allocate management class table for "new" class version */
1311                 *class = kzalloc(sizeof **class, GFP_ATOMIC);
1312                 if (!*class) {
1313                         printk(KERN_ERR PFX "No memory for "
1314                                "ib_mad_mgmt_class_table\n");
1315                         ret = -ENOMEM;
1316                         goto error1;
1317                 }
1318
1319                 /* Allocate method table for this management class */
1320                 method = &(*class)->method_table[mgmt_class];
1321                 if ((ret = allocate_method_table(method)))
1322                         goto error2;
1323         } else {
1324                 method = &(*class)->method_table[mgmt_class];
1325                 if (!*method) {
1326                         /* Allocate method table for this management class */
1327                         if ((ret = allocate_method_table(method)))
1328                                 goto error1;
1329                 }
1330         }
1331
1332         /* Now, make sure methods are not already in use */
1333         if (method_in_use(method, mad_reg_req))
1334                 goto error3;
1335
1336         /* Finally, add in methods being registered */
1337         for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1338                 (*method)->agent[i] = agent_priv;
1339
1340         return 0;
1341
1342 error3:
1343         /* Remove any methods for this mad agent */
1344         remove_methods_mad_agent(*method, agent_priv);
1345         /* Now, check to see if there are any methods in use */
1346         if (!check_method_table(*method)) {
1347                 /* If not, release management method table */
1348                 kfree(*method);
1349                 *method = NULL;
1350         }
1351         ret = -EINVAL;
1352         goto error1;
1353 error2:
1354         kfree(*class);
1355         *class = NULL;
1356 error1:
1357         return ret;
1358 }
1359
1360 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1361                            struct ib_mad_agent_private *agent_priv)
1362 {
1363         struct ib_mad_port_private *port_priv;
1364         struct ib_mad_mgmt_vendor_class_table **vendor_table;
1365         struct ib_mad_mgmt_vendor_class_table *vendor = NULL;
1366         struct ib_mad_mgmt_vendor_class *vendor_class = NULL;
1367         struct ib_mad_mgmt_method_table **method;
1368         int i, ret = -ENOMEM;
1369         u8 vclass;
1370
1371         /* "New" vendor (with OUI) class */
1372         vclass = vendor_class_index(mad_reg_req->mgmt_class);
1373         port_priv = agent_priv->qp_info->port_priv;
1374         vendor_table = &port_priv->version[
1375                                 mad_reg_req->mgmt_class_version].vendor;
1376         if (!*vendor_table) {
1377                 /* Allocate mgmt vendor class table for "new" class version */
1378                 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC);
1379                 if (!vendor) {
1380                         printk(KERN_ERR PFX "No memory for "
1381                                "ib_mad_mgmt_vendor_class_table\n");
1382                         goto error1;
1383                 }
1384
1385                 *vendor_table = vendor;
1386         }
1387         if (!(*vendor_table)->vendor_class[vclass]) {
1388                 /* Allocate table for this management vendor class */
1389                 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC);
1390                 if (!vendor_class) {
1391                         printk(KERN_ERR PFX "No memory for "
1392                                "ib_mad_mgmt_vendor_class\n");
1393                         goto error2;
1394                 }
1395
1396                 (*vendor_table)->vendor_class[vclass] = vendor_class;
1397         }
1398         for (i = 0; i < MAX_MGMT_OUI; i++) {
1399                 /* Is there matching OUI for this vendor class ? */
1400                 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i],
1401                             mad_reg_req->oui, 3)) {
1402                         method = &(*vendor_table)->vendor_class[
1403                                                 vclass]->method_table[i];
1404                         BUG_ON(!*method);
1405                         goto check_in_use;
1406                 }
1407         }
1408         for (i = 0; i < MAX_MGMT_OUI; i++) {
1409                 /* OUI slot available ? */
1410                 if (!is_vendor_oui((*vendor_table)->vendor_class[
1411                                 vclass]->oui[i])) {
1412                         method = &(*vendor_table)->vendor_class[
1413                                 vclass]->method_table[i];
1414                         BUG_ON(*method);
1415                         /* Allocate method table for this OUI */
1416                         if ((ret = allocate_method_table(method)))
1417                                 goto error3;
1418                         memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
1419                                mad_reg_req->oui, 3);
1420                         goto check_in_use;
1421                 }
1422         }
1423         printk(KERN_ERR PFX "All OUI slots in use\n");
1424         goto error3;
1425
1426 check_in_use:
1427         /* Now, make sure methods are not already in use */
1428         if (method_in_use(method, mad_reg_req))
1429                 goto error4;
1430
1431         /* Finally, add in methods being registered */
1432         for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
1433                 (*method)->agent[i] = agent_priv;
1434
1435         return 0;
1436
1437 error4:
1438         /* Remove any methods for this mad agent */
1439         remove_methods_mad_agent(*method, agent_priv);
1440         /* Now, check to see if there are any methods in use */
1441         if (!check_method_table(*method)) {
1442                 /* If not, release management method table */
1443                 kfree(*method);
1444                 *method = NULL;
1445         }
1446         ret = -EINVAL;
1447 error3:
1448         if (vendor_class) {
1449                 (*vendor_table)->vendor_class[vclass] = NULL;
1450                 kfree(vendor_class);
1451         }
1452 error2:
1453         if (vendor) {
1454                 *vendor_table = NULL;
1455                 kfree(vendor);
1456         }
1457 error1:
1458         return ret;
1459 }
1460
1461 static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv)
1462 {
1463         struct ib_mad_port_private *port_priv;
1464         struct ib_mad_mgmt_class_table *class;
1465         struct ib_mad_mgmt_method_table *method;
1466         struct ib_mad_mgmt_vendor_class_table *vendor;
1467         struct ib_mad_mgmt_vendor_class *vendor_class;
1468         int index;
1469         u8 mgmt_class;
1470
1471         /*
1472          * Was MAD registration request supplied
1473          * with original registration ?
1474          */
1475         if (!agent_priv->reg_req) {
1476                 goto out;
1477         }
1478
1479         port_priv = agent_priv->qp_info->port_priv;
1480         mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class);
1481         class = port_priv->version[
1482                         agent_priv->reg_req->mgmt_class_version].class;
1483         if (!class)
1484                 goto vendor_check;
1485
1486         method = class->method_table[mgmt_class];
1487         if (method) {
1488                 /* Remove any methods for this mad agent */
1489                 remove_methods_mad_agent(method, agent_priv);
1490                 /* Now, check to see if there are any methods still in use */
1491                 if (!check_method_table(method)) {
1492                         /* If not, release management method table */
1493                          kfree(method);
1494                          class->method_table[mgmt_class] = NULL;
1495                          /* Any management classes left ? */
1496                         if (!check_class_table(class)) {
1497                                 /* If not, release management class table */
1498                                 kfree(class);
1499                                 port_priv->version[
1500                                         agent_priv->reg_req->
1501                                         mgmt_class_version].class = NULL;
1502                         }
1503                 }
1504         }
1505
1506 vendor_check:
1507         if (!is_vendor_class(mgmt_class))
1508                 goto out;
1509
1510         /* normalize mgmt_class to vendor range 2 */
1511         mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class);
1512         vendor = port_priv->version[
1513                         agent_priv->reg_req->mgmt_class_version].vendor;
1514
1515         if (!vendor)
1516                 goto out;
1517
1518         vendor_class = vendor->vendor_class[mgmt_class];
1519         if (vendor_class) {
1520                 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui);
1521                 if (index < 0)
1522                         goto out;
1523                 method = vendor_class->method_table[index];
1524                 if (method) {
1525                         /* Remove any methods for this mad agent */
1526                         remove_methods_mad_agent(method, agent_priv);
1527                         /*
1528                          * Now, check to see if there are
1529                          * any methods still in use
1530                          */
1531                         if (!check_method_table(method)) {
1532                                 /* If not, release management method table */
1533                                 kfree(method);
1534                                 vendor_class->method_table[index] = NULL;
1535                                 memset(vendor_class->oui[index], 0, 3);
1536                                 /* Any OUIs left ? */
1537                                 if (!check_vendor_class(vendor_class)) {
1538                                         /* If not, release vendor class table */
1539                                         kfree(vendor_class);
1540                                         vendor->vendor_class[mgmt_class] = NULL;
1541                                         /* Any other vendor classes left ? */
1542                                         if (!check_vendor_table(vendor)) {
1543                                                 kfree(vendor);
1544                                                 port_priv->version[
1545                                                         agent_priv->reg_req->
1546                                                         mgmt_class_version].
1547                                                         vendor = NULL;
1548                                         }
1549                                 }
1550                         }
1551                 }
1552         }
1553
1554 out:
1555         return;
1556 }
1557
1558 static struct ib_mad_agent_private *
1559 find_mad_agent(struct ib_mad_port_private *port_priv,
1560                struct ib_mad *mad)
1561 {
1562         struct ib_mad_agent_private *mad_agent = NULL;
1563         unsigned long flags;
1564
1565         spin_lock_irqsave(&port_priv->reg_lock, flags);
1566         if (ib_response_mad(mad)) {
1567                 u32 hi_tid;
1568                 struct ib_mad_agent_private *entry;
1569
1570                 /*
1571                  * Routing is based on high 32 bits of transaction ID
1572                  * of MAD.
1573                  */
1574                 hi_tid = be64_to_cpu(mad->mad_hdr.tid) >> 32;
1575                 list_for_each_entry(entry, &port_priv->agent_list, agent_list) {
1576                         if (entry->agent.hi_tid == hi_tid) {
1577                                 mad_agent = entry;
1578                                 break;
1579                         }
1580                 }
1581         } else {
1582                 struct ib_mad_mgmt_class_table *class;
1583                 struct ib_mad_mgmt_method_table *method;
1584                 struct ib_mad_mgmt_vendor_class_table *vendor;
1585                 struct ib_mad_mgmt_vendor_class *vendor_class;
1586                 struct ib_vendor_mad *vendor_mad;
1587                 int index;
1588
1589                 /*
1590                  * Routing is based on version, class, and method
1591                  * For "newer" vendor MADs, also based on OUI
1592                  */
1593                 if (mad->mad_hdr.class_version >= MAX_MGMT_VERSION)
1594                         goto out;
1595                 if (!is_vendor_class(mad->mad_hdr.mgmt_class)) {
1596                         class = port_priv->version[
1597                                         mad->mad_hdr.class_version].class;
1598                         if (!class)
1599                                 goto out;
1600                         if (convert_mgmt_class(mad->mad_hdr.mgmt_class) >=
1601                             IB_MGMT_MAX_METHODS)
1602                                 goto out;
1603                         method = class->method_table[convert_mgmt_class(
1604                                                         mad->mad_hdr.mgmt_class)];
1605                         if (method)
1606                                 mad_agent = method->agent[mad->mad_hdr.method &
1607                                                           ~IB_MGMT_METHOD_RESP];
1608                 } else {
1609                         vendor = port_priv->version[
1610                                         mad->mad_hdr.class_version].vendor;
1611                         if (!vendor)
1612                                 goto out;
1613                         vendor_class = vendor->vendor_class[vendor_class_index(
1614                                                 mad->mad_hdr.mgmt_class)];
1615                         if (!vendor_class)
1616                                 goto out;
1617                         /* Find matching OUI */
1618                         vendor_mad = (struct ib_vendor_mad *)mad;
1619                         index = find_vendor_oui(vendor_class, vendor_mad->oui);
1620                         if (index == -1)
1621                                 goto out;
1622                         method = vendor_class->method_table[index];
1623                         if (method) {
1624                                 mad_agent = method->agent[mad->mad_hdr.method &
1625                                                           ~IB_MGMT_METHOD_RESP];
1626                         }
1627                 }
1628         }
1629
1630         if (mad_agent) {
1631                 if (mad_agent->agent.recv_handler)
1632                         atomic_inc(&mad_agent->refcount);
1633                 else {
1634                         printk(KERN_NOTICE PFX "No receive handler for client "
1635                                "%p on port %d\n",
1636                                &mad_agent->agent, port_priv->port_num);
1637                         mad_agent = NULL;
1638                 }
1639         }
1640 out:
1641         spin_unlock_irqrestore(&port_priv->reg_lock, flags);
1642
1643         return mad_agent;
1644 }
1645
1646 static int validate_mad(struct ib_mad *mad, u32 qp_num)
1647 {
1648         int valid = 0;
1649
1650         /* Make sure MAD base version is understood */
1651         if (mad->mad_hdr.base_version != IB_MGMT_BASE_VERSION) {
1652                 printk(KERN_ERR PFX "MAD received with unsupported base "
1653                        "version %d\n", mad->mad_hdr.base_version);
1654                 goto out;
1655         }
1656
1657         /* Filter SMI packets sent to other than QP0 */
1658         if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
1659             (mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
1660                 if (qp_num == 0)
1661                         valid = 1;
1662         } else {
1663                 /* Filter GSI packets sent to QP0 */
1664                 if (qp_num != 0)
1665                         valid = 1;
1666         }
1667
1668 out:
1669         return valid;
1670 }
1671
1672 static int is_data_mad(struct ib_mad_agent_private *mad_agent_priv,
1673                        struct ib_mad_hdr *mad_hdr)
1674 {
1675         struct ib_rmpp_mad *rmpp_mad;
1676
1677         rmpp_mad = (struct ib_rmpp_mad *)mad_hdr;
1678         return !mad_agent_priv->agent.rmpp_version ||
1679                 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
1680                                     IB_MGMT_RMPP_FLAG_ACTIVE) ||
1681                 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA);
1682 }
1683
1684 static inline int rcv_has_same_class(struct ib_mad_send_wr_private *wr,
1685                                      struct ib_mad_recv_wc *rwc)
1686 {
1687         return ((struct ib_mad *)(wr->send_buf.mad))->mad_hdr.mgmt_class ==
1688                 rwc->recv_buf.mad->mad_hdr.mgmt_class;
1689 }
1690
1691 static inline int rcv_has_same_gid(struct ib_mad_agent_private *mad_agent_priv,
1692                                    struct ib_mad_send_wr_private *wr,
1693                                    struct ib_mad_recv_wc *rwc )
1694 {
1695         struct ib_ah_attr attr;
1696         u8 send_resp, rcv_resp;
1697         union ib_gid sgid;
1698         struct ib_device *device = mad_agent_priv->agent.device;
1699         u8 port_num = mad_agent_priv->agent.port_num;
1700         u8 lmc;
1701
1702         send_resp = ib_response_mad((struct ib_mad *)wr->send_buf.mad);
1703         rcv_resp = ib_response_mad(rwc->recv_buf.mad);
1704
1705         if (send_resp == rcv_resp)
1706                 /* both requests, or both responses. GIDs different */
1707                 return 0;
1708
1709         if (ib_query_ah(wr->send_buf.ah, &attr))
1710                 /* Assume not equal, to avoid false positives. */
1711                 return 0;
1712
1713         if (!!(attr.ah_flags & IB_AH_GRH) !=
1714             !!(rwc->wc->wc_flags & IB_WC_GRH))
1715                 /* one has GID, other does not.  Assume different */
1716                 return 0;
1717
1718         if (!send_resp && rcv_resp) {
1719                 /* is request/response. */
1720                 if (!(attr.ah_flags & IB_AH_GRH)) {
1721                         if (ib_get_cached_lmc(device, port_num, &lmc))
1722                                 return 0;
1723                         return (!lmc || !((attr.src_path_bits ^
1724                                            rwc->wc->dlid_path_bits) &
1725                                           ((1 << lmc) - 1)));
1726                 } else {
1727                         if (ib_get_cached_gid(device, port_num,
1728                                               attr.grh.sgid_index, &sgid))
1729                                 return 0;
1730                         return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw,
1731                                        16);
1732                 }
1733         }
1734
1735         if (!(attr.ah_flags & IB_AH_GRH))
1736                 return attr.dlid == rwc->wc->slid;
1737         else
1738                 return !memcmp(attr.grh.dgid.raw, rwc->recv_buf.grh->sgid.raw,
1739                                16);
1740 }
1741
1742 static inline int is_direct(u8 class)
1743 {
1744         return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE);
1745 }
1746
1747 struct ib_mad_send_wr_private*
1748 ib_find_send_mad(struct ib_mad_agent_private *mad_agent_priv,
1749                  struct ib_mad_recv_wc *wc)
1750 {
1751         struct ib_mad_send_wr_private *wr;
1752         struct ib_mad *mad;
1753
1754         mad = (struct ib_mad *)wc->recv_buf.mad;
1755
1756         list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) {
1757                 if ((wr->tid == mad->mad_hdr.tid) &&
1758                     rcv_has_same_class(wr, wc) &&
1759                     /*
1760                      * Don't check GID for direct routed MADs.
1761                      * These might have permissive LIDs.
1762                      */
1763                     (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) ||
1764                      rcv_has_same_gid(mad_agent_priv, wr, wc)))
1765                         return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1766         }
1767
1768         /*
1769          * It's possible to receive the response before we've
1770          * been notified that the send has completed
1771          */
1772         list_for_each_entry(wr, &mad_agent_priv->send_list, agent_list) {
1773                 if (is_data_mad(mad_agent_priv, wr->send_buf.mad) &&
1774                     wr->tid == mad->mad_hdr.tid &&
1775                     wr->timeout &&
1776                     rcv_has_same_class(wr, wc) &&
1777                     /*
1778                      * Don't check GID for direct routed MADs.
1779                      * These might have permissive LIDs.
1780                      */
1781                     (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) ||
1782                      rcv_has_same_gid(mad_agent_priv, wr, wc)))
1783                         /* Verify request has not been canceled */
1784                         return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1785         }
1786         return NULL;
1787 }
1788
1789 void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr)
1790 {
1791         mad_send_wr->timeout = 0;
1792         if (mad_send_wr->refcount == 1)
1793                 list_move_tail(&mad_send_wr->agent_list,
1794                               &mad_send_wr->mad_agent_priv->done_list);
1795 }
1796
1797 static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
1798                                  struct ib_mad_recv_wc *mad_recv_wc)
1799 {
1800         struct ib_mad_send_wr_private *mad_send_wr;
1801         struct ib_mad_send_wc mad_send_wc;
1802         unsigned long flags;
1803
1804         INIT_LIST_HEAD(&mad_recv_wc->rmpp_list);
1805         list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list);
1806         if (mad_agent_priv->agent.rmpp_version) {
1807                 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv,
1808                                                       mad_recv_wc);
1809                 if (!mad_recv_wc) {
1810                         deref_mad_agent(mad_agent_priv);
1811                         return;
1812                 }
1813         }
1814
1815         /* Complete corresponding request */
1816         if (ib_response_mad(mad_recv_wc->recv_buf.mad)) {
1817                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1818                 mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc);
1819                 if (!mad_send_wr) {
1820                         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1821                         ib_free_recv_mad(mad_recv_wc);
1822                         deref_mad_agent(mad_agent_priv);
1823                         return;
1824                 }
1825                 ib_mark_mad_done(mad_send_wr);
1826                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1827
1828                 /* Defined behavior is to complete response before request */
1829                 mad_recv_wc->wc->wr_id = (unsigned long) &mad_send_wr->send_buf;
1830                 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1831                                                    mad_recv_wc);
1832                 atomic_dec(&mad_agent_priv->refcount);
1833
1834                 mad_send_wc.status = IB_WC_SUCCESS;
1835                 mad_send_wc.vendor_err = 0;
1836                 mad_send_wc.send_buf = &mad_send_wr->send_buf;
1837                 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
1838         } else {
1839                 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1840                                                    mad_recv_wc);
1841                 deref_mad_agent(mad_agent_priv);
1842         }
1843 }
1844
1845 static void ib_mad_recv_done_handler(struct ib_mad_port_private *port_priv,
1846                                      struct ib_wc *wc)
1847 {
1848         struct ib_mad_qp_info *qp_info;
1849         struct ib_mad_private_header *mad_priv_hdr;
1850         struct ib_mad_private *recv, *response = NULL;
1851         struct ib_mad_list_head *mad_list;
1852         struct ib_mad_agent_private *mad_agent;
1853         int port_num;
1854
1855         mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
1856         qp_info = mad_list->mad_queue->qp_info;
1857         dequeue_mad(mad_list);
1858
1859         mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header,
1860                                     mad_list);
1861         recv = container_of(mad_priv_hdr, struct ib_mad_private, header);
1862         ib_dma_unmap_single(port_priv->device,
1863                             recv->header.mapping,
1864                             sizeof(struct ib_mad_private) -
1865                               sizeof(struct ib_mad_private_header),
1866                             DMA_FROM_DEVICE);
1867
1868         /* Setup MAD receive work completion from "normal" work completion */
1869         recv->header.wc = *wc;
1870         recv->header.recv_wc.wc = &recv->header.wc;
1871         recv->header.recv_wc.mad_len = sizeof(struct ib_mad);
1872         recv->header.recv_wc.recv_buf.mad = &recv->mad.mad;
1873         recv->header.recv_wc.recv_buf.grh = &recv->grh;
1874
1875         if (atomic_read(&qp_info->snoop_count))
1876                 snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS);
1877
1878         /* Validate MAD */
1879         if (!validate_mad(&recv->mad.mad, qp_info->qp->qp_num))
1880                 goto out;
1881
1882         response = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
1883         if (!response) {
1884                 printk(KERN_ERR PFX "ib_mad_recv_done_handler no memory "
1885                        "for response buffer\n");
1886                 goto out;
1887         }
1888
1889         if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH)
1890                 port_num = wc->port_num;
1891         else
1892                 port_num = port_priv->port_num;
1893
1894         if (recv->mad.mad.mad_hdr.mgmt_class ==
1895             IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1896                 enum smi_forward_action retsmi;
1897
1898                 if (smi_handle_dr_smp_recv(&recv->mad.smp,
1899                                            port_priv->device->node_type,
1900                                            port_num,
1901                                            port_priv->device->phys_port_cnt) ==
1902                                            IB_SMI_DISCARD)
1903                         goto out;
1904
1905                 retsmi = smi_check_forward_dr_smp(&recv->mad.smp);
1906                 if (retsmi == IB_SMI_LOCAL)
1907                         goto local;
1908
1909                 if (retsmi == IB_SMI_SEND) { /* don't forward */
1910                         if (smi_handle_dr_smp_send(&recv->mad.smp,
1911                                                    port_priv->device->node_type,
1912                                                    port_num) == IB_SMI_DISCARD)
1913                                 goto out;
1914
1915                         if (smi_check_local_smp(&recv->mad.smp, port_priv->device) == IB_SMI_DISCARD)
1916                                 goto out;
1917                 } else if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH) {
1918                         /* forward case for switches */
1919                         memcpy(response, recv, sizeof(*response));
1920                         response->header.recv_wc.wc = &response->header.wc;
1921                         response->header.recv_wc.recv_buf.mad = &response->mad.mad;
1922                         response->header.recv_wc.recv_buf.grh = &response->grh;
1923
1924                         agent_send_response(&response->mad.mad,
1925                                             &response->grh, wc,
1926                                             port_priv->device,
1927                                             smi_get_fwd_port(&recv->mad.smp),
1928                                             qp_info->qp->qp_num);
1929
1930                         goto out;
1931                 }
1932         }
1933
1934 local:
1935         /* Give driver "right of first refusal" on incoming MAD */
1936         if (port_priv->device->process_mad) {
1937                 int ret;
1938
1939                 ret = port_priv->device->process_mad(port_priv->device, 0,
1940                                                      port_priv->port_num,
1941                                                      wc, &recv->grh,
1942                                                      &recv->mad.mad,
1943                                                      &response->mad.mad);
1944                 if (ret & IB_MAD_RESULT_SUCCESS) {
1945                         if (ret & IB_MAD_RESULT_CONSUMED)
1946                                 goto out;
1947                         if (ret & IB_MAD_RESULT_REPLY) {
1948                                 agent_send_response(&response->mad.mad,
1949                                                     &recv->grh, wc,
1950                                                     port_priv->device,
1951                                                     port_num,
1952                                                     qp_info->qp->qp_num);
1953                                 goto out;
1954                         }
1955                 }
1956         }
1957
1958         mad_agent = find_mad_agent(port_priv, &recv->mad.mad);
1959         if (mad_agent) {
1960                 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
1961                 /*
1962                  * recv is freed up in error cases in ib_mad_complete_recv
1963                  * or via recv_handler in ib_mad_complete_recv()
1964                  */
1965                 recv = NULL;
1966         }
1967
1968 out:
1969         /* Post another receive request for this QP */
1970         if (response) {
1971                 ib_mad_post_receive_mads(qp_info, response);
1972                 if (recv)
1973                         kmem_cache_free(ib_mad_cache, recv);
1974         } else
1975                 ib_mad_post_receive_mads(qp_info, recv);
1976 }
1977
1978 static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
1979 {
1980         struct ib_mad_send_wr_private *mad_send_wr;
1981         unsigned long delay;
1982
1983         if (list_empty(&mad_agent_priv->wait_list)) {
1984                 __cancel_delayed_work(&mad_agent_priv->timed_work);
1985         } else {
1986                 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
1987                                          struct ib_mad_send_wr_private,
1988                                          agent_list);
1989
1990                 if (time_after(mad_agent_priv->timeout,
1991                                mad_send_wr->timeout)) {
1992                         mad_agent_priv->timeout = mad_send_wr->timeout;
1993                         __cancel_delayed_work(&mad_agent_priv->timed_work);
1994                         delay = mad_send_wr->timeout - jiffies;
1995                         if ((long)delay <= 0)
1996                                 delay = 1;
1997                         queue_delayed_work(mad_agent_priv->qp_info->
1998                                            port_priv->wq,
1999                                            &mad_agent_priv->timed_work, delay);
2000                 }
2001         }
2002 }
2003
2004 static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
2005 {
2006         struct ib_mad_agent_private *mad_agent_priv;
2007         struct ib_mad_send_wr_private *temp_mad_send_wr;
2008         struct list_head *list_item;
2009         unsigned long delay;
2010
2011         mad_agent_priv = mad_send_wr->mad_agent_priv;
2012         list_del(&mad_send_wr->agent_list);
2013
2014         delay = mad_send_wr->timeout;
2015         mad_send_wr->timeout += jiffies;
2016
2017         if (delay) {
2018                 list_for_each_prev(list_item, &mad_agent_priv->wait_list) {
2019                         temp_mad_send_wr = list_entry(list_item,
2020                                                 struct ib_mad_send_wr_private,
2021                                                 agent_list);
2022                         if (time_after(mad_send_wr->timeout,
2023                                        temp_mad_send_wr->timeout))
2024                                 break;
2025                 }
2026         }
2027         else
2028                 list_item = &mad_agent_priv->wait_list;
2029         list_add(&mad_send_wr->agent_list, list_item);
2030
2031         /* Reschedule a work item if we have a shorter timeout */
2032         if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list) {
2033                 __cancel_delayed_work(&mad_agent_priv->timed_work);
2034                 queue_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2035                                    &mad_agent_priv->timed_work, delay);
2036         }
2037 }
2038
2039 void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr,
2040                           int timeout_ms)
2041 {
2042         mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2043         wait_for_response(mad_send_wr);
2044 }
2045
2046 /*
2047  * Process a send work completion
2048  */
2049 void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
2050                              struct ib_mad_send_wc *mad_send_wc)
2051 {
2052         struct ib_mad_agent_private     *mad_agent_priv;
2053         unsigned long                   flags;
2054         int                             ret;
2055
2056         mad_agent_priv = mad_send_wr->mad_agent_priv;
2057         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2058         if (mad_agent_priv->agent.rmpp_version) {
2059                 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc);
2060                 if (ret == IB_RMPP_RESULT_CONSUMED)
2061                         goto done;
2062         } else
2063                 ret = IB_RMPP_RESULT_UNHANDLED;
2064
2065         if (mad_send_wc->status != IB_WC_SUCCESS &&
2066             mad_send_wr->status == IB_WC_SUCCESS) {
2067                 mad_send_wr->status = mad_send_wc->status;
2068                 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2069         }
2070
2071         if (--mad_send_wr->refcount > 0) {
2072                 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout &&
2073                     mad_send_wr->status == IB_WC_SUCCESS) {
2074                         wait_for_response(mad_send_wr);
2075                 }
2076                 goto done;
2077         }
2078
2079         /* Remove send from MAD agent and notify client of completion */
2080         list_del(&mad_send_wr->agent_list);
2081         adjust_timeout(mad_agent_priv);
2082         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2083
2084         if (mad_send_wr->status != IB_WC_SUCCESS )
2085                 mad_send_wc->status = mad_send_wr->status;
2086         if (ret == IB_RMPP_RESULT_INTERNAL)
2087                 ib_rmpp_send_handler(mad_send_wc);
2088         else
2089                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2090                                                    mad_send_wc);
2091
2092         /* Release reference on agent taken when sending */
2093         deref_mad_agent(mad_agent_priv);
2094         return;
2095 done:
2096         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2097 }
2098
2099 static void ib_mad_send_done_handler(struct ib_mad_port_private *port_priv,
2100                                      struct ib_wc *wc)
2101 {
2102         struct ib_mad_send_wr_private   *mad_send_wr, *queued_send_wr;
2103         struct ib_mad_list_head         *mad_list;
2104         struct ib_mad_qp_info           *qp_info;
2105         struct ib_mad_queue             *send_queue;
2106         struct ib_send_wr               *bad_send_wr;
2107         struct ib_mad_send_wc           mad_send_wc;
2108         unsigned long flags;
2109         int ret;
2110
2111         mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2112         mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2113                                    mad_list);
2114         send_queue = mad_list->mad_queue;
2115         qp_info = send_queue->qp_info;
2116
2117 retry:
2118         ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2119                             mad_send_wr->header_mapping,
2120                             mad_send_wr->sg_list[0].length, DMA_TO_DEVICE);
2121         ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2122                             mad_send_wr->payload_mapping,
2123                             mad_send_wr->sg_list[1].length, DMA_TO_DEVICE);
2124         queued_send_wr = NULL;
2125         spin_lock_irqsave(&send_queue->lock, flags);
2126         list_del(&mad_list->list);
2127
2128         /* Move queued send to the send queue */
2129         if (send_queue->count-- > send_queue->max_active) {
2130                 mad_list = container_of(qp_info->overflow_list.next,
2131                                         struct ib_mad_list_head, list);
2132                 queued_send_wr = container_of(mad_list,
2133                                         struct ib_mad_send_wr_private,
2134                                         mad_list);
2135                 list_move_tail(&mad_list->list, &send_queue->list);
2136         }
2137         spin_unlock_irqrestore(&send_queue->lock, flags);
2138
2139         mad_send_wc.send_buf = &mad_send_wr->send_buf;
2140         mad_send_wc.status = wc->status;
2141         mad_send_wc.vendor_err = wc->vendor_err;
2142         if (atomic_read(&qp_info->snoop_count))
2143                 snoop_send(qp_info, &mad_send_wr->send_buf, &mad_send_wc,
2144                            IB_MAD_SNOOP_SEND_COMPLETIONS);
2145         ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
2146
2147         if (queued_send_wr) {
2148                 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr,
2149                                    &bad_send_wr);
2150                 if (ret) {
2151                         printk(KERN_ERR PFX "ib_post_send failed: %d\n", ret);
2152                         mad_send_wr = queued_send_wr;
2153                         wc->status = IB_WC_LOC_QP_OP_ERR;
2154                         goto retry;
2155                 }
2156         }
2157 }
2158
2159 static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info)
2160 {
2161         struct ib_mad_send_wr_private *mad_send_wr;
2162         struct ib_mad_list_head *mad_list;
2163         unsigned long flags;
2164
2165         spin_lock_irqsave(&qp_info->send_queue.lock, flags);
2166         list_for_each_entry(mad_list, &qp_info->send_queue.list, list) {
2167                 mad_send_wr = container_of(mad_list,
2168                                            struct ib_mad_send_wr_private,
2169                                            mad_list);
2170                 mad_send_wr->retry = 1;
2171         }
2172         spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
2173 }
2174
2175 static void mad_error_handler(struct ib_mad_port_private *port_priv,
2176                               struct ib_wc *wc)
2177 {
2178         struct ib_mad_list_head *mad_list;
2179         struct ib_mad_qp_info *qp_info;
2180         struct ib_mad_send_wr_private *mad_send_wr;
2181         int ret;
2182
2183         /* Determine if failure was a send or receive */
2184         mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2185         qp_info = mad_list->mad_queue->qp_info;
2186         if (mad_list->mad_queue == &qp_info->recv_queue)
2187                 /*
2188                  * Receive errors indicate that the QP has entered the error
2189                  * state - error handling/shutdown code will cleanup
2190                  */
2191                 return;
2192
2193         /*
2194          * Send errors will transition the QP to SQE - move
2195          * QP to RTS and repost flushed work requests
2196          */
2197         mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2198                                    mad_list);
2199         if (wc->status == IB_WC_WR_FLUSH_ERR) {
2200                 if (mad_send_wr->retry) {
2201                         /* Repost send */
2202                         struct ib_send_wr *bad_send_wr;
2203
2204                         mad_send_wr->retry = 0;
2205                         ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr,
2206                                         &bad_send_wr);
2207                         if (ret)
2208                                 ib_mad_send_done_handler(port_priv, wc);
2209                 } else
2210                         ib_mad_send_done_handler(port_priv, wc);
2211         } else {
2212                 struct ib_qp_attr *attr;
2213
2214                 /* Transition QP to RTS and fail offending send */
2215                 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2216                 if (attr) {
2217                         attr->qp_state = IB_QPS_RTS;
2218                         attr->cur_qp_state = IB_QPS_SQE;
2219                         ret = ib_modify_qp(qp_info->qp, attr,
2220                                            IB_QP_STATE | IB_QP_CUR_STATE);
2221                         kfree(attr);
2222                         if (ret)
2223                                 printk(KERN_ERR PFX "mad_error_handler - "
2224                                        "ib_modify_qp to RTS : %d\n", ret);
2225                         else
2226                                 mark_sends_for_retry(qp_info);
2227                 }
2228                 ib_mad_send_done_handler(port_priv, wc);
2229         }
2230 }
2231
2232 /*
2233  * IB MAD completion callback
2234  */
2235 static void ib_mad_completion_handler(struct work_struct *work)
2236 {
2237         struct ib_mad_port_private *port_priv;
2238         struct ib_wc wc;
2239
2240         port_priv = container_of(work, struct ib_mad_port_private, work);
2241         ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2242
2243         while (ib_poll_cq(port_priv->cq, 1, &wc) == 1) {
2244                 if (wc.status == IB_WC_SUCCESS) {
2245                         switch (wc.opcode) {
2246                         case IB_WC_SEND:
2247                                 ib_mad_send_done_handler(port_priv, &wc);
2248                                 break;
2249                         case IB_WC_RECV:
2250                                 ib_mad_recv_done_handler(port_priv, &wc);
2251                                 break;
2252                         default:
2253                                 BUG_ON(1);
2254                                 break;
2255                         }
2256                 } else
2257                         mad_error_handler(port_priv, &wc);
2258         }
2259 }
2260
2261 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
2262 {
2263         unsigned long flags;
2264         struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr;
2265         struct ib_mad_send_wc mad_send_wc;
2266         struct list_head cancel_list;
2267
2268         INIT_LIST_HEAD(&cancel_list);
2269
2270         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2271         list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2272                                  &mad_agent_priv->send_list, agent_list) {
2273                 if (mad_send_wr->status == IB_WC_SUCCESS) {
2274                         mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2275                         mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2276                 }
2277         }
2278
2279         /* Empty wait list to prevent receives from finding a request */
2280         list_splice_init(&mad_agent_priv->wait_list, &cancel_list);
2281         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2282
2283         /* Report all cancelled requests */
2284         mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
2285         mad_send_wc.vendor_err = 0;
2286
2287         list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2288                                  &cancel_list, agent_list) {
2289                 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2290                 list_del(&mad_send_wr->agent_list);
2291                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2292                                                    &mad_send_wc);
2293                 atomic_dec(&mad_agent_priv->refcount);
2294         }
2295 }
2296
2297 static struct ib_mad_send_wr_private*
2298 find_send_wr(struct ib_mad_agent_private *mad_agent_priv,
2299              struct ib_mad_send_buf *send_buf)
2300 {
2301         struct ib_mad_send_wr_private *mad_send_wr;
2302
2303         list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
2304                             agent_list) {
2305                 if (&mad_send_wr->send_buf == send_buf)
2306                         return mad_send_wr;
2307         }
2308
2309         list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
2310                             agent_list) {
2311                 if (is_data_mad(mad_agent_priv, mad_send_wr->send_buf.mad) &&
2312                     &mad_send_wr->send_buf == send_buf)
2313                         return mad_send_wr;
2314         }
2315         return NULL;
2316 }
2317
2318 int ib_modify_mad(struct ib_mad_agent *mad_agent,
2319                   struct ib_mad_send_buf *send_buf, u32 timeout_ms)
2320 {
2321         struct ib_mad_agent_private *mad_agent_priv;
2322         struct ib_mad_send_wr_private *mad_send_wr;
2323         unsigned long flags;
2324         int active;
2325
2326         mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
2327                                       agent);
2328         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2329         mad_send_wr = find_send_wr(mad_agent_priv, send_buf);
2330         if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) {
2331                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2332                 return -EINVAL;
2333         }
2334
2335         active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1);
2336         if (!timeout_ms) {
2337                 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2338                 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2339         }
2340
2341         mad_send_wr->send_buf.timeout_ms = timeout_ms;
2342         if (active)
2343                 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2344         else
2345                 ib_reset_mad_timeout(mad_send_wr, timeout_ms);
2346
2347         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2348         return 0;
2349 }
2350 EXPORT_SYMBOL(ib_modify_mad);
2351
2352 void ib_cancel_mad(struct ib_mad_agent *mad_agent,
2353                    struct ib_mad_send_buf *send_buf)
2354 {
2355         ib_modify_mad(mad_agent, send_buf, 0);
2356 }
2357 EXPORT_SYMBOL(ib_cancel_mad);
2358
2359 static void local_completions(struct work_struct *work)
2360 {
2361         struct ib_mad_agent_private *mad_agent_priv;
2362         struct ib_mad_local_private *local;
2363         struct ib_mad_agent_private *recv_mad_agent;
2364         unsigned long flags;
2365         int free_mad;
2366         struct ib_wc wc;
2367         struct ib_mad_send_wc mad_send_wc;
2368
2369         mad_agent_priv =
2370                 container_of(work, struct ib_mad_agent_private, local_work);
2371
2372         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2373         while (!list_empty(&mad_agent_priv->local_list)) {
2374                 local = list_entry(mad_agent_priv->local_list.next,
2375                                    struct ib_mad_local_private,
2376                                    completion_list);
2377                 list_del(&local->completion_list);
2378                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2379                 free_mad = 0;
2380                 if (local->mad_priv) {
2381                         recv_mad_agent = local->recv_mad_agent;
2382                         if (!recv_mad_agent) {
2383                                 printk(KERN_ERR PFX "No receive MAD agent for local completion\n");
2384                                 free_mad = 1;
2385                                 goto local_send_completion;
2386                         }
2387
2388                         /*
2389                          * Defined behavior is to complete response
2390                          * before request
2391                          */
2392                         build_smp_wc(recv_mad_agent->agent.qp,
2393                                      (unsigned long) local->mad_send_wr,
2394                                      be16_to_cpu(IB_LID_PERMISSIVE),
2395                                      0, recv_mad_agent->agent.port_num, &wc);
2396
2397                         local->mad_priv->header.recv_wc.wc = &wc;
2398                         local->mad_priv->header.recv_wc.mad_len =
2399                                                 sizeof(struct ib_mad);
2400                         INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list);
2401                         list_add(&local->mad_priv->header.recv_wc.recv_buf.list,
2402                                  &local->mad_priv->header.recv_wc.rmpp_list);
2403                         local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
2404                         local->mad_priv->header.recv_wc.recv_buf.mad =
2405                                                 &local->mad_priv->mad.mad;
2406                         if (atomic_read(&recv_mad_agent->qp_info->snoop_count))
2407                                 snoop_recv(recv_mad_agent->qp_info,
2408                                           &local->mad_priv->header.recv_wc,
2409                                            IB_MAD_SNOOP_RECVS);
2410                         recv_mad_agent->agent.recv_handler(
2411                                                 &recv_mad_agent->agent,
2412                                                 &local->mad_priv->header.recv_wc);
2413                         spin_lock_irqsave(&recv_mad_agent->lock, flags);
2414                         atomic_dec(&recv_mad_agent->refcount);
2415                         spin_unlock_irqrestore(&recv_mad_agent->lock, flags);
2416                 }
2417
2418 local_send_completion:
2419                 /* Complete send */
2420                 mad_send_wc.status = IB_WC_SUCCESS;
2421                 mad_send_wc.vendor_err = 0;
2422                 mad_send_wc.send_buf = &local->mad_send_wr->send_buf;
2423                 if (atomic_read(&mad_agent_priv->qp_info->snoop_count))
2424                         snoop_send(mad_agent_priv->qp_info,
2425                                    &local->mad_send_wr->send_buf,
2426                                    &mad_send_wc, IB_MAD_SNOOP_SEND_COMPLETIONS);
2427                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2428                                                    &mad_send_wc);
2429
2430                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2431                 atomic_dec(&mad_agent_priv->refcount);
2432                 if (free_mad)
2433                         kmem_cache_free(ib_mad_cache, local->mad_priv);
2434                 kfree(local);
2435         }
2436         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2437 }
2438
2439 static int retry_send(struct ib_mad_send_wr_private *mad_send_wr)
2440 {
2441         int ret;
2442
2443         if (!mad_send_wr->retries_left)
2444                 return -ETIMEDOUT;
2445
2446         mad_send_wr->retries_left--;
2447         mad_send_wr->send_buf.retries++;
2448
2449         mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
2450
2451         if (mad_send_wr->mad_agent_priv->agent.rmpp_version) {
2452                 ret = ib_retry_rmpp(mad_send_wr);
2453                 switch (ret) {
2454                 case IB_RMPP_RESULT_UNHANDLED:
2455                         ret = ib_send_mad(mad_send_wr);
2456                         break;
2457                 case IB_RMPP_RESULT_CONSUMED:
2458                         ret = 0;
2459                         break;
2460                 default:
2461                         ret = -ECOMM;
2462                         break;
2463                 }
2464         } else
2465                 ret = ib_send_mad(mad_send_wr);
2466
2467         if (!ret) {
2468                 mad_send_wr->refcount++;
2469                 list_add_tail(&mad_send_wr->agent_list,
2470                               &mad_send_wr->mad_agent_priv->send_list);
2471         }
2472         return ret;
2473 }
2474
2475 static void timeout_sends(struct work_struct *work)
2476 {
2477         struct ib_mad_agent_private *mad_agent_priv;
2478         struct ib_mad_send_wr_private *mad_send_wr;
2479         struct ib_mad_send_wc mad_send_wc;
2480         unsigned long flags, delay;
2481
2482         mad_agent_priv = container_of(work, struct ib_mad_agent_private,
2483                                       timed_work.work);
2484         mad_send_wc.vendor_err = 0;
2485
2486         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2487         while (!list_empty(&mad_agent_priv->wait_list)) {
2488                 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2489                                          struct ib_mad_send_wr_private,
2490                                          agent_list);
2491
2492                 if (time_after(mad_send_wr->timeout, jiffies)) {
2493                         delay = mad_send_wr->timeout - jiffies;
2494                         if ((long)delay <= 0)
2495                                 delay = 1;
2496                         queue_delayed_work(mad_agent_priv->qp_info->
2497                                            port_priv->wq,
2498                                            &mad_agent_priv->timed_work, delay);
2499                         break;
2500                 }
2501
2502                 list_del(&mad_send_wr->agent_list);
2503                 if (mad_send_wr->status == IB_WC_SUCCESS &&
2504                     !retry_send(mad_send_wr))
2505                         continue;
2506
2507                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2508
2509                 if (mad_send_wr->status == IB_WC_SUCCESS)
2510                         mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR;
2511                 else
2512                         mad_send_wc.status = mad_send_wr->status;
2513                 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2514                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2515                                                    &mad_send_wc);
2516
2517                 atomic_dec(&mad_agent_priv->refcount);
2518                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2519         }
2520         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2521 }
2522
2523 static void ib_mad_thread_completion_handler(struct ib_cq *cq, void *arg)
2524 {
2525         struct ib_mad_port_private *port_priv = cq->cq_context;
2526         unsigned long flags;
2527
2528         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2529         if (!list_empty(&port_priv->port_list))
2530                 queue_work(port_priv->wq, &port_priv->work);
2531         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2532 }
2533
2534 /*
2535  * Allocate receive MADs and post receive WRs for them
2536  */
2537 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
2538                                     struct ib_mad_private *mad)
2539 {
2540         unsigned long flags;
2541         int post, ret;
2542         struct ib_mad_private *mad_priv;
2543         struct ib_sge sg_list;
2544         struct ib_recv_wr recv_wr, *bad_recv_wr;
2545         struct ib_mad_queue *recv_queue = &qp_info->recv_queue;
2546
2547         /* Initialize common scatter list fields */
2548         sg_list.length = sizeof *mad_priv - sizeof mad_priv->header;
2549         sg_list.lkey = (*qp_info->port_priv->mr).lkey;
2550
2551         /* Initialize common receive WR fields */
2552         recv_wr.next = NULL;
2553         recv_wr.sg_list = &sg_list;
2554         recv_wr.num_sge = 1;
2555
2556         do {
2557                 /* Allocate and map receive buffer */
2558                 if (mad) {
2559                         mad_priv = mad;
2560                         mad = NULL;
2561                 } else {
2562                         mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
2563                         if (!mad_priv) {
2564                                 printk(KERN_ERR PFX "No memory for receive buffer\n");
2565                                 ret = -ENOMEM;
2566                                 break;
2567                         }
2568                 }
2569                 sg_list.addr = ib_dma_map_single(qp_info->port_priv->device,
2570                                                  &mad_priv->grh,
2571                                                  sizeof *mad_priv -
2572                                                    sizeof mad_priv->header,
2573                                                  DMA_FROM_DEVICE);
2574                 mad_priv->header.mapping = sg_list.addr;
2575                 recv_wr.wr_id = (unsigned long)&mad_priv->header.mad_list;
2576                 mad_priv->header.mad_list.mad_queue = recv_queue;
2577
2578                 /* Post receive WR */
2579                 spin_lock_irqsave(&recv_queue->lock, flags);
2580                 post = (++recv_queue->count < recv_queue->max_active);
2581                 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list);
2582                 spin_unlock_irqrestore(&recv_queue->lock, flags);
2583                 ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr);
2584                 if (ret) {
2585                         spin_lock_irqsave(&recv_queue->lock, flags);
2586                         list_del(&mad_priv->header.mad_list.list);
2587                         recv_queue->count--;
2588                         spin_unlock_irqrestore(&recv_queue->lock, flags);
2589                         ib_dma_unmap_single(qp_info->port_priv->device,
2590                                             mad_priv->header.mapping,
2591                                             sizeof *mad_priv -
2592                                               sizeof mad_priv->header,
2593                                             DMA_FROM_DEVICE);
2594                         kmem_cache_free(ib_mad_cache, mad_priv);
2595                         printk(KERN_ERR PFX "ib_post_recv failed: %d\n", ret);
2596                         break;
2597                 }
2598         } while (post);
2599
2600         return ret;
2601 }
2602
2603 /*
2604  * Return all the posted receive MADs
2605  */
2606 static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info)
2607 {
2608         struct ib_mad_private_header *mad_priv_hdr;
2609         struct ib_mad_private *recv;
2610         struct ib_mad_list_head *mad_list;
2611
2612         if (!qp_info->qp)
2613                 return;
2614
2615         while (!list_empty(&qp_info->recv_queue.list)) {
2616
2617                 mad_list = list_entry(qp_info->recv_queue.list.next,
2618                                       struct ib_mad_list_head, list);
2619                 mad_priv_hdr = container_of(mad_list,
2620                                             struct ib_mad_private_header,
2621                                             mad_list);
2622                 recv = container_of(mad_priv_hdr, struct ib_mad_private,
2623                                     header);
2624
2625                 /* Remove from posted receive MAD list */
2626                 list_del(&mad_list->list);
2627
2628                 ib_dma_unmap_single(qp_info->port_priv->device,
2629                                     recv->header.mapping,
2630                                     sizeof(struct ib_mad_private) -
2631                                       sizeof(struct ib_mad_private_header),
2632                                     DMA_FROM_DEVICE);
2633                 kmem_cache_free(ib_mad_cache, recv);
2634         }
2635
2636         qp_info->recv_queue.count = 0;
2637 }
2638
2639 /*
2640  * Start the port
2641  */
2642 static int ib_mad_port_start(struct ib_mad_port_private *port_priv)
2643 {
2644         int ret, i;
2645         struct ib_qp_attr *attr;
2646         struct ib_qp *qp;
2647
2648         attr = kmalloc(sizeof *attr, GFP_KERNEL);
2649         if (!attr) {
2650                 printk(KERN_ERR PFX "Couldn't kmalloc ib_qp_attr\n");
2651                 return -ENOMEM;
2652         }
2653
2654         for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2655                 qp = port_priv->qp_info[i].qp;
2656                 if (!qp)
2657                         continue;
2658
2659                 /*
2660                  * PKey index for QP1 is irrelevant but
2661                  * one is needed for the Reset to Init transition
2662                  */
2663                 attr->qp_state = IB_QPS_INIT;
2664                 attr->pkey_index = 0;
2665                 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY;
2666                 ret = ib_modify_qp(qp, attr, IB_QP_STATE |
2667                                              IB_QP_PKEY_INDEX | IB_QP_QKEY);
2668                 if (ret) {
2669                         printk(KERN_ERR PFX "Couldn't change QP%d state to "
2670                                "INIT: %d\n", i, ret);
2671                         goto out;
2672                 }
2673
2674                 attr->qp_state = IB_QPS_RTR;
2675                 ret = ib_modify_qp(qp, attr, IB_QP_STATE);
2676                 if (ret) {
2677                         printk(KERN_ERR PFX "Couldn't change QP%d state to "
2678                                "RTR: %d\n", i, ret);
2679                         goto out;
2680                 }
2681
2682                 attr->qp_state = IB_QPS_RTS;
2683                 attr->sq_psn = IB_MAD_SEND_Q_PSN;
2684                 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN);
2685                 if (ret) {
2686                         printk(KERN_ERR PFX "Couldn't change QP%d state to "
2687                                "RTS: %d\n", i, ret);
2688                         goto out;
2689                 }
2690         }
2691
2692         ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2693         if (ret) {
2694                 printk(KERN_ERR PFX "Failed to request completion "
2695                        "notification: %d\n", ret);
2696                 goto out;
2697         }
2698
2699         for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2700                 if (!port_priv->qp_info[i].qp)
2701                         continue;
2702
2703                 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
2704                 if (ret) {
2705                         printk(KERN_ERR PFX "Couldn't post receive WRs\n");
2706                         goto out;
2707                 }
2708         }
2709 out:
2710         kfree(attr);
2711         return ret;
2712 }
2713
2714 static void qp_event_handler(struct ib_event *event, void *qp_context)
2715 {
2716         struct ib_mad_qp_info   *qp_info = qp_context;
2717
2718         /* It's worse than that! He's dead, Jim! */
2719         printk(KERN_ERR PFX "Fatal error (%d) on MAD QP (%d)\n",
2720                 event->event, qp_info->qp->qp_num);
2721 }
2722
2723 static void init_mad_queue(struct ib_mad_qp_info *qp_info,
2724                            struct ib_mad_queue *mad_queue)
2725 {
2726         mad_queue->qp_info = qp_info;
2727         mad_queue->count = 0;
2728         spin_lock_init(&mad_queue->lock);
2729         INIT_LIST_HEAD(&mad_queue->list);
2730 }
2731
2732 static void init_mad_qp(struct ib_mad_port_private *port_priv,
2733                         struct ib_mad_qp_info *qp_info)
2734 {
2735         qp_info->port_priv = port_priv;
2736         init_mad_queue(qp_info, &qp_info->send_queue);
2737         init_mad_queue(qp_info, &qp_info->recv_queue);
2738         INIT_LIST_HEAD(&qp_info->overflow_list);
2739         spin_lock_init(&qp_info->snoop_lock);
2740         qp_info->snoop_table = NULL;
2741         qp_info->snoop_table_size = 0;
2742         atomic_set(&qp_info->snoop_count, 0);
2743 }
2744
2745 static int create_mad_qp(struct ib_mad_qp_info *qp_info,
2746                          enum ib_qp_type qp_type)
2747 {
2748         struct ib_qp_init_attr  qp_init_attr;
2749         int ret;
2750
2751         memset(&qp_init_attr, 0, sizeof qp_init_attr);
2752         qp_init_attr.send_cq = qp_info->port_priv->cq;
2753         qp_init_attr.recv_cq = qp_info->port_priv->cq;
2754         qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
2755         qp_init_attr.cap.max_send_wr = mad_sendq_size;
2756         qp_init_attr.cap.max_recv_wr = mad_recvq_size;
2757         qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG;
2758         qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG;
2759         qp_init_attr.qp_type = qp_type;
2760         qp_init_attr.port_num = qp_info->port_priv->port_num;
2761         qp_init_attr.qp_context = qp_info;
2762         qp_init_attr.event_handler = qp_event_handler;
2763         qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr);
2764         if (IS_ERR(qp_info->qp)) {
2765                 printk(KERN_ERR PFX "Couldn't create ib_mad QP%d\n",
2766                        get_spl_qp_index(qp_type));
2767                 ret = PTR_ERR(qp_info->qp);
2768                 goto error;
2769         }
2770         /* Use minimum queue sizes unless the CQ is resized */
2771         qp_info->send_queue.max_active = mad_sendq_size;
2772         qp_info->recv_queue.max_active = mad_recvq_size;
2773         return 0;
2774
2775 error:
2776         return ret;
2777 }
2778
2779 static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
2780 {
2781         if (!qp_info->qp)
2782                 return;
2783
2784         ib_destroy_qp(qp_info->qp);
2785         kfree(qp_info->snoop_table);
2786 }
2787
2788 /*
2789  * Open the port
2790  * Create the QP, PD, MR, and CQ if needed
2791  */
2792 static int ib_mad_port_open(struct ib_device *device,
2793                             int port_num)
2794 {
2795         int ret, cq_size;
2796         struct ib_mad_port_private *port_priv;
2797         unsigned long flags;
2798         char name[sizeof "ib_mad123"];
2799         int has_smi;
2800
2801         /* Create new device info */
2802         port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
2803         if (!port_priv) {
2804                 printk(KERN_ERR PFX "No memory for ib_mad_port_private\n");
2805                 return -ENOMEM;
2806         }
2807
2808         port_priv->device = device;
2809         port_priv->port_num = port_num;
2810         spin_lock_init(&port_priv->reg_lock);
2811         INIT_LIST_HEAD(&port_priv->agent_list);
2812         init_mad_qp(port_priv, &port_priv->qp_info[0]);
2813         init_mad_qp(port_priv, &port_priv->qp_info[1]);
2814
2815         cq_size = mad_sendq_size + mad_recvq_size;
2816         has_smi = rdma_port_get_link_layer(device, port_num) == IB_LINK_LAYER_INFINIBAND;
2817         if (has_smi)
2818                 cq_size *= 2;
2819
2820         port_priv->cq = ib_create_cq(port_priv->device,
2821                                      ib_mad_thread_completion_handler,
2822                                      NULL, port_priv, cq_size, 0);
2823         if (IS_ERR(port_priv->cq)) {
2824                 printk(KERN_ERR PFX "Couldn't create ib_mad CQ\n");
2825                 ret = PTR_ERR(port_priv->cq);
2826                 goto error3;
2827         }
2828
2829         port_priv->pd = ib_alloc_pd(device);
2830         if (IS_ERR(port_priv->pd)) {
2831                 printk(KERN_ERR PFX "Couldn't create ib_mad PD\n");
2832                 ret = PTR_ERR(port_priv->pd);
2833                 goto error4;
2834         }
2835
2836         port_priv->mr = ib_get_dma_mr(port_priv->pd, IB_ACCESS_LOCAL_WRITE);
2837         if (IS_ERR(port_priv->mr)) {
2838                 printk(KERN_ERR PFX "Couldn't get ib_mad DMA MR\n");
2839                 ret = PTR_ERR(port_priv->mr);
2840                 goto error5;
2841         }
2842
2843         if (has_smi) {
2844                 ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
2845                 if (ret)
2846                         goto error6;
2847         }
2848         ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI);
2849         if (ret)
2850                 goto error7;
2851
2852         snprintf(name, sizeof name, "ib_mad%d", port_num);
2853         port_priv->wq = create_singlethread_workqueue(name);
2854         if (!port_priv->wq) {
2855                 ret = -ENOMEM;
2856                 goto error8;
2857         }
2858         INIT_WORK(&port_priv->work, ib_mad_completion_handler);
2859
2860         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2861         list_add_tail(&port_priv->port_list, &ib_mad_port_list);
2862         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2863
2864         ret = ib_mad_port_start(port_priv);
2865         if (ret) {
2866                 printk(KERN_ERR PFX "Couldn't start port\n");
2867                 goto error9;
2868         }
2869
2870         return 0;
2871
2872 error9:
2873         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2874         list_del_init(&port_priv->port_list);
2875         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2876
2877         destroy_workqueue(port_priv->wq);
2878 error8:
2879         destroy_mad_qp(&port_priv->qp_info[1]);
2880 error7:
2881         destroy_mad_qp(&port_priv->qp_info[0]);
2882 error6:
2883         ib_dereg_mr(port_priv->mr);
2884 error5:
2885         ib_dealloc_pd(port_priv->pd);
2886 error4:
2887         ib_destroy_cq(port_priv->cq);
2888         cleanup_recv_queue(&port_priv->qp_info[1]);
2889         cleanup_recv_queue(&port_priv->qp_info[0]);
2890 error3:
2891         kfree(port_priv);
2892
2893         return ret;
2894 }
2895
2896 /*
2897  * Close the port
2898  * If there are no classes using the port, free the port
2899  * resources (CQ, MR, PD, QP) and remove the port's info structure
2900  */
2901 static int ib_mad_port_close(struct ib_device *device, int port_num)
2902 {
2903         struct ib_mad_port_private *port_priv;
2904         unsigned long flags;
2905
2906         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2907         port_priv = __ib_get_mad_port(device, port_num);
2908         if (port_priv == NULL) {
2909                 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2910                 printk(KERN_ERR PFX "Port %d not found\n", port_num);
2911                 return -ENODEV;
2912         }
2913         list_del_init(&port_priv->port_list);
2914         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2915
2916         destroy_workqueue(port_priv->wq);
2917         destroy_mad_qp(&port_priv->qp_info[1]);
2918         destroy_mad_qp(&port_priv->qp_info[0]);
2919         ib_dereg_mr(port_priv->mr);
2920         ib_dealloc_pd(port_priv->pd);
2921         ib_destroy_cq(port_priv->cq);
2922         cleanup_recv_queue(&port_priv->qp_info[1]);
2923         cleanup_recv_queue(&port_priv->qp_info[0]);
2924         /* XXX: Handle deallocation of MAD registration tables */
2925
2926         kfree(port_priv);
2927
2928         return 0;
2929 }
2930
2931 static void ib_mad_init_device(struct ib_device *device)
2932 {
2933         int start, end, i;
2934
2935         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
2936                 return;
2937
2938         if (device->node_type == RDMA_NODE_IB_SWITCH) {
2939                 start = 0;
2940                 end   = 0;
2941         } else {
2942                 start = 1;
2943                 end   = device->phys_port_cnt;
2944         }
2945
2946         for (i = start; i <= end; i++) {
2947                 if (ib_mad_port_open(device, i)) {
2948                         printk(KERN_ERR PFX "Couldn't open %s port %d\n",
2949                                device->name, i);
2950                         goto error;
2951                 }
2952                 if (ib_agent_port_open(device, i)) {
2953                         printk(KERN_ERR PFX "Couldn't open %s port %d "
2954                                "for agents\n",
2955                                device->name, i);
2956                         goto error_agent;
2957                 }
2958         }
2959         return;
2960
2961 error_agent:
2962         if (ib_mad_port_close(device, i))
2963                 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2964                        device->name, i);
2965
2966 error:
2967         i--;
2968
2969         while (i >= start) {
2970                 if (ib_agent_port_close(device, i))
2971                         printk(KERN_ERR PFX "Couldn't close %s port %d "
2972                                "for agents\n",
2973                                device->name, i);
2974                 if (ib_mad_port_close(device, i))
2975                         printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2976                                device->name, i);
2977                 i--;
2978         }
2979 }
2980
2981 static void ib_mad_remove_device(struct ib_device *device)
2982 {
2983         int i, num_ports, cur_port;
2984
2985         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
2986                 return;
2987
2988         if (device->node_type == RDMA_NODE_IB_SWITCH) {
2989                 num_ports = 1;
2990                 cur_port = 0;
2991         } else {
2992                 num_ports = device->phys_port_cnt;
2993                 cur_port = 1;
2994         }
2995         for (i = 0; i < num_ports; i++, cur_port++) {
2996                 if (ib_agent_port_close(device, cur_port))
2997                         printk(KERN_ERR PFX "Couldn't close %s port %d "
2998                                "for agents\n",
2999                                device->name, cur_port);
3000                 if (ib_mad_port_close(device, cur_port))
3001                         printk(KERN_ERR PFX "Couldn't close %s port %d\n",
3002                                device->name, cur_port);
3003         }
3004 }
3005
3006 static struct ib_client mad_client = {
3007         .name   = "mad",
3008         .add = ib_mad_init_device,
3009         .remove = ib_mad_remove_device
3010 };
3011
3012 static int __init ib_mad_init_module(void)
3013 {
3014         int ret;
3015
3016         mad_recvq_size = min(mad_recvq_size, IB_MAD_QP_MAX_SIZE);
3017         mad_recvq_size = max(mad_recvq_size, IB_MAD_QP_MIN_SIZE);
3018
3019         mad_sendq_size = min(mad_sendq_size, IB_MAD_QP_MAX_SIZE);
3020         mad_sendq_size = max(mad_sendq_size, IB_MAD_QP_MIN_SIZE);
3021
3022         ib_mad_cache = kmem_cache_create("ib_mad",
3023                                          sizeof(struct ib_mad_private),
3024                                          0,
3025                                          SLAB_HWCACHE_ALIGN,
3026                                          NULL);
3027         if (!ib_mad_cache) {
3028                 printk(KERN_ERR PFX "Couldn't create ib_mad cache\n");
3029                 ret = -ENOMEM;
3030                 goto error1;
3031         }
3032
3033         INIT_LIST_HEAD(&ib_mad_port_list);
3034
3035         if (ib_register_client(&mad_client)) {
3036                 printk(KERN_ERR PFX "Couldn't register ib_mad client\n");
3037                 ret = -EINVAL;
3038                 goto error2;
3039         }
3040
3041         return 0;
3042
3043 error2:
3044         kmem_cache_destroy(ib_mad_cache);
3045 error1:
3046         return ret;
3047 }
3048
3049 static void __exit ib_mad_cleanup_module(void)
3050 {
3051         ib_unregister_client(&mad_client);
3052         kmem_cache_destroy(ib_mad_cache);
3053 }
3054
3055 module_init(ib_mad_init_module);
3056 module_exit(ib_mad_cleanup_module);