SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/infiniband/core/mad.c

   1 /*
   2  * Copyright (c) 2004-2007 Voltaire, Inc. All rights reserved.
   3  * Copyright (c) 2005 Intel Corporation.  All rights reserved.
   4  * Copyright (c) 2005 Mellanox Technologies Ltd.  All rights reserved.
   5  *
   6  * This software is available to you under a choice of one of two
   7  * licenses.  You may choose to be licensed under the terms of the GNU
   8  * General Public License (GPL) Version 2, available from the file
   9  * COPYING in the main directory of this source tree, or the
  10  * OpenIB.org BSD license below:
  11  *
  12  *     Redistribution and use in source and binary forms, with or
  13  *     without modification, are permitted provided that the following
  14  *     conditions are met:
  15  *
  16  *      - Redistributions of source code must retain the above
  17  *        copyright notice, this list of conditions and the following
  18  *        disclaimer.
  19  *
  20  *      - Redistributions in binary form must reproduce the above
  21  *        copyright notice, this list of conditions and the following
  22  *        disclaimer in the documentation and/or other materials
  23  *        provided with the distribution.
  24  *
  25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  32  * SOFTWARE.
  33  *
  34  */
  35 #include <linux/dma-mapping.h>
  36 #include <rdma/ib_cache.h>
  37
  38 #include "mad_priv.h"
  39 #include "mad_rmpp.h"
  40 #include "smi.h"
  41 #include "agent.h"
  42
  43 MODULE_LICENSE("Dual BSD/GPL");
  44 MODULE_DESCRIPTION("kernel IB MAD API");
  45 MODULE_AUTHOR("Hal Rosenstock");
  46 MODULE_AUTHOR("Sean Hefty");
  47
  48 static struct kmem_cache *ib_mad_cache;
  49
  50 static struct list_head ib_mad_port_list;
  51 static u32 ib_mad_client_id = 0;
  52
  53 /* Port list lock */
  54 static spinlock_t ib_mad_port_list_lock;
  55
  56
  57 /* Forward declarations */
  58 static int method_in_use(struct ib_mad_mgmt_method_table **method,
  59                          struct ib_mad_reg_req *mad_reg_req);
  60 static void remove_mad_reg_req(struct ib_mad_agent_private *priv);
  61 static struct ib_mad_agent_private *find_mad_agent(
  62                                         struct ib_mad_port_private *port_priv,
  63                                         struct ib_mad *mad);
  64 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
  65                                     struct ib_mad_private *mad);
  66 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv);
  67 static void timeout_sends(struct work_struct *work);
  68 static void local_completions(struct work_struct *work);
  69 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
  70                               struct ib_mad_agent_private *agent_priv,
  71                               u8 mgmt_class);
  72 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
  73                            struct ib_mad_agent_private *agent_priv);
  74
  75 /*
  76  * Returns a ib_mad_port_private structure or NULL for a device/port
  77  * Assumes ib_mad_port_list_lock is being held
  78  */
  79 static inline struct ib_mad_port_private *
  80 __ib_get_mad_port(struct ib_device *device, int port_num)
  81 {
  82         struct ib_mad_port_private *entry;
  83
  84         list_for_each_entry(entry, &ib_mad_port_list, port_list) {
  85                 if (entry->device == device && entry->port_num == port_num)
  86                         return entry;
  87         }
  88         return NULL;
  89 }
  90
  91 /*
  92  * Wrapper function to return a ib_mad_port_private structure or NULL
  93  * for a device/port
  94  */
  95 static inline struct ib_mad_port_private *
  96 ib_get_mad_port(struct ib_device *device, int port_num)
  97 {
  98         struct ib_mad_port_private *entry;
  99         unsigned long flags;
 100
 101         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
 102         entry = __ib_get_mad_port(device, port_num);
 103         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
 104
 105         return entry;
 106 }
 107
 108 static inline u8 convert_mgmt_class(u8 mgmt_class)
 109 {
 110         /* Alias IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE to 0 */
 111         return mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE ?
 112                 0 : mgmt_class;
 113 }
 114
 115 static int get_spl_qp_index(enum ib_qp_type qp_type)
 116 {
 117         switch (qp_type)
 118         {
 119         case IB_QPT_SMI:
 120                 return 0;
 121         case IB_QPT_GSI:
 122                 return 1;
 123         default:
 124                 return -1;
 125         }
 126 }
 127
 128 static int vendor_class_index(u8 mgmt_class)
 129 {
 130         return mgmt_class - IB_MGMT_CLASS_VENDOR_RANGE2_START;
 131 }
 132
 133 static int is_vendor_class(u8 mgmt_class)
 134 {
 135         if ((mgmt_class < IB_MGMT_CLASS_VENDOR_RANGE2_START) ||
 136             (mgmt_class > IB_MGMT_CLASS_VENDOR_RANGE2_END))
 137                 return 0;
 138         return 1;
 139 }
 140
 141 static int is_vendor_oui(char *oui)
 142 {
 143         if (oui[0] || oui[1] || oui[2])
 144                 return 1;
 145         return 0;
 146 }
 147
 148 static int is_vendor_method_in_use(
 149                 struct ib_mad_mgmt_vendor_class *vendor_class,
 150                 struct ib_mad_reg_req *mad_reg_req)
 151 {
 152         struct ib_mad_mgmt_method_table *method;
 153         int i;
 154
 155         for (i = 0; i < MAX_MGMT_OUI; i++) {
 156                 if (!memcmp(vendor_class->oui[i], mad_reg_req->oui, 3)) {
 157                         method = vendor_class->method_table[i];
 158                         if (method) {
 159                                 if (method_in_use(&method, mad_reg_req))
 160                                         return 1;
 161                                 else
 162                                         break;
 163                         }
 164                 }
 165         }
 166         return 0;
 167 }
 168
 169 int ib_response_mad(struct ib_mad *mad)
 170 {
 171         return ((mad->mad_hdr.method & IB_MGMT_METHOD_RESP) ||
 172                 (mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS) ||
 173                 ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_BM) &&
 174                  (mad->mad_hdr.attr_mod & IB_BM_ATTR_MOD_RESP)));
 175 }
 176 EXPORT_SYMBOL(ib_response_mad);
 177
 178 /*
 179  * ib_register_mad_agent - Register to send/receive MADs
 180  */
 181 struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
 182                                            u8 port_num,
 183                                            enum ib_qp_type qp_type,
 184                                            struct ib_mad_reg_req *mad_reg_req,
 185                                            u8 rmpp_version,
 186                                            ib_mad_send_handler send_handler,
 187                                            ib_mad_recv_handler recv_handler,
 188                                            void *context)
 189 {
 190         struct ib_mad_port_private *port_priv;
 191         struct ib_mad_agent *ret = ERR_PTR(-EINVAL);
 192         struct ib_mad_agent_private *mad_agent_priv;
 193         struct ib_mad_reg_req *reg_req = NULL;
 194         struct ib_mad_mgmt_class_table *class;
 195         struct ib_mad_mgmt_vendor_class_table *vendor;
 196         struct ib_mad_mgmt_vendor_class *vendor_class;
 197         struct ib_mad_mgmt_method_table *method;
 198         int ret2, qpn;
 199         unsigned long flags;
 200         u8 mgmt_class, vclass;
 201
 202         /* Validate parameters */
 203         qpn = get_spl_qp_index(qp_type);
 204         if (qpn == -1)
 205                 goto error1;
 206
 207         if (rmpp_version && rmpp_version != IB_MGMT_RMPP_VERSION)
 208                 goto error1;
 209
 210         /* Validate MAD registration request if supplied */
 211         if (mad_reg_req) {
 212                 if (mad_reg_req->mgmt_class_version >= MAX_MGMT_VERSION)
 213                         goto error1;
 214                 if (!recv_handler)
 215                         goto error1;
 216                 if (mad_reg_req->mgmt_class >= MAX_MGMT_CLASS) {
 217                         /*
 218                          * IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE is the only
 219                          * one in this range currently allowed
 220                          */
 221                         if (mad_reg_req->mgmt_class !=
 222                             IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
 223                                 goto error1;
 224                 } else if (mad_reg_req->mgmt_class == 0) {
 225                         /*
 226                          * Class 0 is reserved in IBA and is used for
 227                          * aliasing of IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE
 228                          */
 229                         goto error1;
 230                 } else if (is_vendor_class(mad_reg_req->mgmt_class)) {
 231                         /*
 232                          * If class is in "new" vendor range,
 233                          * ensure supplied OUI is not zero
 234                          */
 235                         if (!is_vendor_oui(mad_reg_req->oui))
 236                                 goto error1;
 237                 }
 238                 /* Make sure class supplied is consistent with RMPP */
 239                 if (!ib_is_mad_class_rmpp(mad_reg_req->mgmt_class)) {
 240                         if (rmpp_version)
 241                                 goto error1;
 242                 }
 243                 /* Make sure class supplied is consistent with QP type */
 244                 if (qp_type == IB_QPT_SMI) {
 245                         if ((mad_reg_req->mgmt_class !=
 246                                         IB_MGMT_CLASS_SUBN_LID_ROUTED) &&
 247                             (mad_reg_req->mgmt_class !=
 248                                         IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
 249                                 goto error1;
 250                 } else {
 251                         if ((mad_reg_req->mgmt_class ==
 252                                         IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
 253                             (mad_reg_req->mgmt_class ==
 254                                         IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE))
 255                                 goto error1;
 256                 }
 257         } else {
 258                 /* No registration request supplied */
 259                 if (!send_handler)
 260                         goto error1;
 261         }
 262
 263         /* Validate device and port */
 264         port_priv = ib_get_mad_port(device, port_num);
 265         if (!port_priv) {
 266                 ret = ERR_PTR(-ENODEV);
 267                 goto error1;
 268         }
 269
 270         /* Allocate structures */
 271         mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL);
 272         if (!mad_agent_priv) {
 273                 ret = ERR_PTR(-ENOMEM);
 274                 goto error1;
 275         }
 276
 277         mad_agent_priv->agent.mr = ib_get_dma_mr(port_priv->qp_info[qpn].qp->pd,
 278                                                  IB_ACCESS_LOCAL_WRITE);
 279         if (IS_ERR(mad_agent_priv->agent.mr)) {
 280                 ret = ERR_PTR(-ENOMEM);
 281                 goto error2;
 282         }
 283
 284         if (mad_reg_req) {
 285                 reg_req = kmalloc(sizeof *reg_req, GFP_KERNEL);
 286                 if (!reg_req) {
 287                         ret = ERR_PTR(-ENOMEM);
 288                         goto error3;
 289                 }
 290                 /* Make a copy of the MAD registration request */
 291                 memcpy(reg_req, mad_reg_req, sizeof *reg_req);
 292         }
 293
 294         /* Now, fill in the various structures */
 295         mad_agent_priv->qp_info = &port_priv->qp_info[qpn];
 296         mad_agent_priv->reg_req = reg_req;
 297         mad_agent_priv->agent.rmpp_version = rmpp_version;
 298         mad_agent_priv->agent.device = device;
 299         mad_agent_priv->agent.recv_handler = recv_handler;
 300         mad_agent_priv->agent.send_handler = send_handler;
 301         mad_agent_priv->agent.context = context;
 302         mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp;
 303         mad_agent_priv->agent.port_num = port_num;
 304
 305         spin_lock_irqsave(&port_priv->reg_lock, flags);
 306         mad_agent_priv->agent.hi_tid = ++ib_mad_client_id;
 307
 308         /*
 309          * Make sure MAD registration (if supplied)
 310          * is non overlapping with any existing ones
 311          */
 312         if (mad_reg_req) {
 313                 mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class);
 314                 if (!is_vendor_class(mgmt_class)) {
 315                         class = port_priv->version[mad_reg_req->
 316                                                    mgmt_class_version].class;
 317                         if (class) {
 318                                 method = class->method_table[mgmt_class];
 319                                 if (method) {
 320                                         if (method_in_use(&method,
 321                                                            mad_reg_req))
 322                                                 goto error4;
 323                                 }
 324                         }
 325                         ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv,
 326                                                   mgmt_class);
 327                 } else {
 328                         /* "New" vendor class range */
 329                         vendor = port_priv->version[mad_reg_req->
 330                                                     mgmt_class_version].vendor;
 331                         if (vendor) {
 332                                 vclass = vendor_class_index(mgmt_class);
 333                                 vendor_class = vendor->vendor_class[vclass];
 334                                 if (vendor_class) {
 335                                         if (is_vendor_method_in_use(
 336                                                         vendor_class,
 337                                                         mad_reg_req))
 338                                                 goto error4;
 339                                 }
 340                         }
 341                         ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv);
 342                 }
 343                 if (ret2) {
 344                         ret = ERR_PTR(ret2);
 345                         goto error4;
 346                 }
 347         }
 348
 349         /* Add mad agent into port's agent list */
 350         list_add_tail(&mad_agent_priv->agent_list, &port_priv->agent_list);
 351         spin_unlock_irqrestore(&port_priv->reg_lock, flags);
 352
 353         spin_lock_init(&mad_agent_priv->lock);
 354         INIT_LIST_HEAD(&mad_agent_priv->send_list);
 355         INIT_LIST_HEAD(&mad_agent_priv->wait_list);
 356         INIT_LIST_HEAD(&mad_agent_priv->done_list);
 357         INIT_LIST_HEAD(&mad_agent_priv->rmpp_list);
 358         INIT_DELAYED_WORK(&mad_agent_priv->timed_work, timeout_sends);
 359         INIT_LIST_HEAD(&mad_agent_priv->local_list);
 360         INIT_WORK(&mad_agent_priv->local_work, local_completions);
 361         atomic_set(&mad_agent_priv->refcount, 1);
 362         init_completion(&mad_agent_priv->comp);
 363
 364         return &mad_agent_priv->agent;
 365
 366 error4:
 367         spin_unlock_irqrestore(&port_priv->reg_lock, flags);
 368         kfree(reg_req);
 369 error3:
 370         ib_dereg_mr(mad_agent_priv->agent.mr);
 371 error2:
 372         kfree(mad_agent_priv);
 373 error1:
 374         return ret;
 375 }
 376 EXPORT_SYMBOL(ib_register_mad_agent);
 377
 378 static inline int is_snooping_sends(int mad_snoop_flags)
 379 {
 380         return (mad_snoop_flags &
 381                 (/*IB_MAD_SNOOP_POSTED_SENDS |
 382                  IB_MAD_SNOOP_RMPP_SENDS |*/
 383                  IB_MAD_SNOOP_SEND_COMPLETIONS /*|
 384                  IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS*/));
 385 }
 386
 387 static inline int is_snooping_recvs(int mad_snoop_flags)
 388 {
 389         return (mad_snoop_flags &
 390                 (IB_MAD_SNOOP_RECVS /*|
 391                  IB_MAD_SNOOP_RMPP_RECVS*/));
 392 }
 393
 394 static int register_snoop_agent(struct ib_mad_qp_info *qp_info,
 395                                 struct ib_mad_snoop_private *mad_snoop_priv)
 396 {
 397         struct ib_mad_snoop_private **new_snoop_table;
 398         unsigned long flags;
 399         int i;
 400
 401         spin_lock_irqsave(&qp_info->snoop_lock, flags);
 402         /* Check for empty slot in array. */
 403         for (i = 0; i < qp_info->snoop_table_size; i++)
 404                 if (!qp_info->snoop_table[i])
 405                         break;
 406
 407         if (i == qp_info->snoop_table_size) {
 408                 /* Grow table. */
 409                 new_snoop_table = kmalloc(sizeof mad_snoop_priv *
 410                                           qp_info->snoop_table_size + 1,
 411                                           GFP_ATOMIC);
 412                 if (!new_snoop_table) {
 413                         i = -ENOMEM;
 414                         goto out;
 415                 }
 416                 if (qp_info->snoop_table) {
 417                         memcpy(new_snoop_table, qp_info->snoop_table,
 418                                sizeof mad_snoop_priv *
 419                                qp_info->snoop_table_size);
 420                         kfree(qp_info->snoop_table);
 421                 }
 422                 qp_info->snoop_table = new_snoop_table;
 423                 qp_info->snoop_table_size++;
 424         }
 425         qp_info->snoop_table[i] = mad_snoop_priv;
 426         atomic_inc(&qp_info->snoop_count);
 427 out:
 428         spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 429         return i;
 430 }
 431
 432 struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device,
 433                                            u8 port_num,
 434                                            enum ib_qp_type qp_type,
 435                                            int mad_snoop_flags,
 436                                            ib_mad_snoop_handler snoop_handler,
 437                                            ib_mad_recv_handler recv_handler,
 438                                            void *context)
 439 {
 440         struct ib_mad_port_private *port_priv;
 441         struct ib_mad_agent *ret;
 442         struct ib_mad_snoop_private *mad_snoop_priv;
 443         int qpn;
 444
 445         /* Validate parameters */
 446         if ((is_snooping_sends(mad_snoop_flags) && !snoop_handler) ||
 447             (is_snooping_recvs(mad_snoop_flags) && !recv_handler)) {
 448                 ret = ERR_PTR(-EINVAL);
 449                 goto error1;
 450         }
 451         qpn = get_spl_qp_index(qp_type);
 452         if (qpn == -1) {
 453                 ret = ERR_PTR(-EINVAL);
 454                 goto error1;
 455         }
 456         port_priv = ib_get_mad_port(device, port_num);
 457         if (!port_priv) {
 458                 ret = ERR_PTR(-ENODEV);
 459                 goto error1;
 460         }
 461         /* Allocate structures */
 462         mad_snoop_priv = kzalloc(sizeof *mad_snoop_priv, GFP_KERNEL);
 463         if (!mad_snoop_priv) {
 464                 ret = ERR_PTR(-ENOMEM);
 465                 goto error1;
 466         }
 467
 468         /* Now, fill in the various structures */
 469         mad_snoop_priv->qp_info = &port_priv->qp_info[qpn];
 470         mad_snoop_priv->agent.device = device;
 471         mad_snoop_priv->agent.recv_handler = recv_handler;
 472         mad_snoop_priv->agent.snoop_handler = snoop_handler;
 473         mad_snoop_priv->agent.context = context;
 474         mad_snoop_priv->agent.qp = port_priv->qp_info[qpn].qp;
 475         mad_snoop_priv->agent.port_num = port_num;
 476         mad_snoop_priv->mad_snoop_flags = mad_snoop_flags;
 477         init_completion(&mad_snoop_priv->comp);
 478         mad_snoop_priv->snoop_index = register_snoop_agent(
 479                                                 &port_priv->qp_info[qpn],
 480                                                 mad_snoop_priv);
 481         if (mad_snoop_priv->snoop_index < 0) {
 482                 ret = ERR_PTR(mad_snoop_priv->snoop_index);
 483                 goto error2;
 484         }
 485
 486         atomic_set(&mad_snoop_priv->refcount, 1);
 487         return &mad_snoop_priv->agent;
 488
 489 error2:
 490         kfree(mad_snoop_priv);
 491 error1:
 492         return ret;
 493 }
 494 EXPORT_SYMBOL(ib_register_mad_snoop);
 495
 496 static inline void deref_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
 497 {
 498         if (atomic_dec_and_test(&mad_agent_priv->refcount))
 499                 complete(&mad_agent_priv->comp);
 500 }
 501
 502 static inline void deref_snoop_agent(struct ib_mad_snoop_private *mad_snoop_priv)
 503 {
 504         if (atomic_dec_and_test(&mad_snoop_priv->refcount))
 505                 complete(&mad_snoop_priv->comp);
 506 }
 507
 508 static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
 509 {
 510         struct ib_mad_port_private *port_priv;
 511         unsigned long flags;
 512
 513         /* Note that we could still be handling received MADs */
 514
 515         /*
 516          * Canceling all sends results in dropping received response
 517          * MADs, preventing us from queuing additional work
 518          */
 519         cancel_mads(mad_agent_priv);
 520         port_priv = mad_agent_priv->qp_info->port_priv;
 521         cancel_delayed_work(&mad_agent_priv->timed_work);
 522
 523         spin_lock_irqsave(&port_priv->reg_lock, flags);
 524         remove_mad_reg_req(mad_agent_priv);
 525         list_del(&mad_agent_priv->agent_list);
 526         spin_unlock_irqrestore(&port_priv->reg_lock, flags);
 527
 528         flush_workqueue(port_priv->wq);
 529         ib_cancel_rmpp_recvs(mad_agent_priv);
 530
 531         deref_mad_agent(mad_agent_priv);
 532         wait_for_completion(&mad_agent_priv->comp);
 533
 534         kfree(mad_agent_priv->reg_req);
 535         ib_dereg_mr(mad_agent_priv->agent.mr);
 536         kfree(mad_agent_priv);
 537 }
 538
 539 static void unregister_mad_snoop(struct ib_mad_snoop_private *mad_snoop_priv)
 540 {
 541         struct ib_mad_qp_info *qp_info;
 542         unsigned long flags;
 543
 544         qp_info = mad_snoop_priv->qp_info;
 545         spin_lock_irqsave(&qp_info->snoop_lock, flags);
 546         qp_info->snoop_table[mad_snoop_priv->snoop_index] = NULL;
 547         atomic_dec(&qp_info->snoop_count);
 548         spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 549
 550         deref_snoop_agent(mad_snoop_priv);
 551         wait_for_completion(&mad_snoop_priv->comp);
 552
 553         kfree(mad_snoop_priv);
 554 }
 555
 556 /*
 557  * ib_unregister_mad_agent - Unregisters a client from using MAD services
 558  */
 559 int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent)
 560 {
 561         struct ib_mad_agent_private *mad_agent_priv;
 562         struct ib_mad_snoop_private *mad_snoop_priv;
 563
 564         /* If the TID is zero, the agent can only snoop. */
 565         if (mad_agent->hi_tid) {
 566                 mad_agent_priv = container_of(mad_agent,
 567                                               struct ib_mad_agent_private,
 568                                               agent);
 569                 unregister_mad_agent(mad_agent_priv);
 570         } else {
 571                 mad_snoop_priv = container_of(mad_agent,
 572                                               struct ib_mad_snoop_private,
 573                                               agent);
 574                 unregister_mad_snoop(mad_snoop_priv);
 575         }
 576         return 0;
 577 }
 578 EXPORT_SYMBOL(ib_unregister_mad_agent);
 579
 580 static void dequeue_mad(struct ib_mad_list_head *mad_list)
 581 {
 582         struct ib_mad_queue *mad_queue;
 583         unsigned long flags;
 584
 585         BUG_ON(!mad_list->mad_queue);
 586         mad_queue = mad_list->mad_queue;
 587         spin_lock_irqsave(&mad_queue->lock, flags);
 588         list_del(&mad_list->list);
 589         mad_queue->count--;
 590         spin_unlock_irqrestore(&mad_queue->lock, flags);
 591 }
 592
 593 static void snoop_send(struct ib_mad_qp_info *qp_info,
 594                        struct ib_mad_send_buf *send_buf,
 595                        struct ib_mad_send_wc *mad_send_wc,
 596                        int mad_snoop_flags)
 597 {
 598         struct ib_mad_snoop_private *mad_snoop_priv;
 599         unsigned long flags;
 600         int i;
 601
 602         spin_lock_irqsave(&qp_info->snoop_lock, flags);
 603         for (i = 0; i < qp_info->snoop_table_size; i++) {
 604                 mad_snoop_priv = qp_info->snoop_table[i];
 605                 if (!mad_snoop_priv ||
 606                     !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
 607                         continue;
 608
 609                 atomic_inc(&mad_snoop_priv->refcount);
 610                 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 611                 mad_snoop_priv->agent.snoop_handler(&mad_snoop_priv->agent,
 612                                                     send_buf, mad_send_wc);
 613                 deref_snoop_agent(mad_snoop_priv);
 614                 spin_lock_irqsave(&qp_info->snoop_lock, flags);
 615         }
 616         spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 617 }
 618
 619 static void snoop_recv(struct ib_mad_qp_info *qp_info,
 620                        struct ib_mad_recv_wc *mad_recv_wc,
 621                        int mad_snoop_flags)
 622 {
 623         struct ib_mad_snoop_private *mad_snoop_priv;
 624         unsigned long flags;
 625         int i;
 626
 627         spin_lock_irqsave(&qp_info->snoop_lock, flags);
 628         for (i = 0; i < qp_info->snoop_table_size; i++) {
 629                 mad_snoop_priv = qp_info->snoop_table[i];
 630                 if (!mad_snoop_priv ||
 631                     !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
 632                         continue;
 633
 634                 atomic_inc(&mad_snoop_priv->refcount);
 635                 spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 636                 mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent,
 637                                                    mad_recv_wc);
 638                 deref_snoop_agent(mad_snoop_priv);
 639                 spin_lock_irqsave(&qp_info->snoop_lock, flags);
 640         }
 641         spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
 642 }
 643
 644 static void build_smp_wc(struct ib_qp *qp,
 645                          u64 wr_id, u16 slid, u16 pkey_index, u8 port_num,
 646                          struct ib_wc *wc)
 647 {
 648         memset(wc, 0, sizeof *wc);
 649         wc->wr_id = wr_id;
 650         wc->status = IB_WC_SUCCESS;
 651         wc->opcode = IB_WC_RECV;
 652         wc->pkey_index = pkey_index;
 653         wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh);
 654         wc->src_qp = IB_QP0;
 655         wc->qp = qp;
 656         wc->slid = slid;
 657         wc->sl = 0;
 658         wc->dlid_path_bits = 0;
 659         wc->port_num = port_num;
 660 }
 661
 662 /*
 663  * Return 0 if SMP is to be sent
 664  * Return 1 if SMP was consumed locally (whether or not solicited)
 665  * Return < 0 if error
 666  */
 667 static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv,
 668                                   struct ib_mad_send_wr_private *mad_send_wr)
 669 {
 670         int ret = 0;
 671         struct ib_smp *smp = mad_send_wr->send_buf.mad;
 672         unsigned long flags;
 673         struct ib_mad_local_private *local;
 674         struct ib_mad_private *mad_priv;
 675         struct ib_mad_port_private *port_priv;
 676         struct ib_mad_agent_private *recv_mad_agent = NULL;
 677         struct ib_device *device = mad_agent_priv->agent.device;
 678         u8 port_num;
 679         struct ib_wc mad_wc;
 680         struct ib_send_wr *send_wr = &mad_send_wr->send_wr;
 681
 682         if (device->node_type == RDMA_NODE_IB_SWITCH &&
 683             smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
 684                 port_num = send_wr->wr.ud.port_num;
 685         else
 686                 port_num = mad_agent_priv->agent.port_num;
 687
 688         /*
 689          * Directed route handling starts if the initial LID routed part of
 690          * a request or the ending LID routed part of a response is empty.
 691          * If we are at the start of the LID routed part, don't update the
 692          * hop_ptr or hop_cnt.  See section 14.2.2, Vol 1 IB spec.
 693          */
 694         if ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) ==
 695              IB_LID_PERMISSIVE &&
 696              smi_handle_dr_smp_send(smp, device->node_type, port_num) ==
 697              IB_SMI_DISCARD) {
 698                 ret = -EINVAL;
 699                 printk(KERN_ERR PFX "Invalid directed route\n");
 700                 goto out;
 701         }
 702
 703         /* Check to post send on QP or process locally */
 704         if (smi_check_local_smp(smp, device) == IB_SMI_DISCARD)
 705                 goto out;
 706
 707         local = kmalloc(sizeof *local, GFP_ATOMIC);
 708         if (!local) {
 709                 ret = -ENOMEM;
 710                 printk(KERN_ERR PFX "No memory for ib_mad_local_private\n");
 711                 goto out;
 712         }
 713         local->mad_priv = NULL;
 714         local->recv_mad_agent = NULL;
 715         mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_ATOMIC);
 716         if (!mad_priv) {
 717                 ret = -ENOMEM;
 718                 printk(KERN_ERR PFX "No memory for local response MAD\n");
 719                 kfree(local);
 720                 goto out;
 721         }
 722
 723         build_smp_wc(mad_agent_priv->agent.qp,
 724                      send_wr->wr_id, be16_to_cpu(smp->dr_slid),
 725                      send_wr->wr.ud.pkey_index,
 726                      send_wr->wr.ud.port_num, &mad_wc);
 727
 728         /* No GRH for DR SMP */
 729         ret = device->process_mad(device, 0, port_num, &mad_wc, NULL,
 730                                   (struct ib_mad *)smp,
 731                                   (struct ib_mad *)&mad_priv->mad);
 732         switch (ret)
 733         {
 734         case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
 735                 if (ib_response_mad(&mad_priv->mad.mad) &&
 736                     mad_agent_priv->agent.recv_handler) {
 737                         local->mad_priv = mad_priv;
 738                         local->recv_mad_agent = mad_agent_priv;
 739                         /*
 740                          * Reference MAD agent until receive
 741                          * side of local completion handled
 742                          */
 743                         atomic_inc(&mad_agent_priv->refcount);
 744                 } else
 745                         kmem_cache_free(ib_mad_cache, mad_priv);
 746                 break;
 747         case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
 748                 kmem_cache_free(ib_mad_cache, mad_priv);
 749                 break;
 750         case IB_MAD_RESULT_SUCCESS:
 751                 /* Treat like an incoming receive MAD */
 752                 port_priv = ib_get_mad_port(mad_agent_priv->agent.device,
 753                                             mad_agent_priv->agent.port_num);
 754                 if (port_priv) {
 755                         mad_priv->mad.mad.mad_hdr.tid =
 756                                 ((struct ib_mad *)smp)->mad_hdr.tid;
 757                         recv_mad_agent = find_mad_agent(port_priv,
 758                                                         &mad_priv->mad.mad);
 759                 }
 760                 if (!port_priv || !recv_mad_agent) {
 761                         kmem_cache_free(ib_mad_cache, mad_priv);
 762                         kfree(local);
 763                         ret = 0;
 764                         goto out;
 765                 }
 766                 local->mad_priv = mad_priv;
 767                 local->recv_mad_agent = recv_mad_agent;
 768                 break;
 769         default:
 770                 kmem_cache_free(ib_mad_cache, mad_priv);
 771                 kfree(local);
 772                 ret = -EINVAL;
 773                 goto out;
 774         }
 775
 776         local->mad_send_wr = mad_send_wr;
 777         /* Reference MAD agent until send side of local completion handled */
 778         atomic_inc(&mad_agent_priv->refcount);
 779         /* Queue local completion to local list */
 780         spin_lock_irqsave(&mad_agent_priv->lock, flags);
 781         list_add_tail(&local->completion_list, &mad_agent_priv->local_list);
 782         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
 783         queue_work(mad_agent_priv->qp_info->port_priv->wq,
 784                    &mad_agent_priv->local_work);
 785         ret = 1;
 786 out:
 787         return ret;
 788 }
 789
 790 static int get_pad_size(int hdr_len, int data_len)
 791 {
 792         int seg_size, pad;
 793
 794         seg_size = sizeof(struct ib_mad) - hdr_len;
 795         if (data_len && seg_size) {
 796                 pad = seg_size - data_len % seg_size;
 797                 return pad == seg_size ? 0 : pad;
 798         } else
 799                 return seg_size;
 800 }
 801
 802 static void free_send_rmpp_list(struct ib_mad_send_wr_private *mad_send_wr)
 803 {
 804         struct ib_rmpp_segment *s, *t;
 805
 806         list_for_each_entry_safe(s, t, &mad_send_wr->rmpp_list, list) {
 807                 list_del(&s->list);
 808                 kfree(s);
 809         }
 810 }
 811
 812 static int alloc_send_rmpp_list(struct ib_mad_send_wr_private *send_wr,
 813                                 gfp_t gfp_mask)
 814 {
 815         struct ib_mad_send_buf *send_buf = &send_wr->send_buf;
 816         struct ib_rmpp_mad *rmpp_mad = send_buf->mad;
 817         struct ib_rmpp_segment *seg = NULL;
 818         int left, seg_size, pad;
 819
 820         send_buf->seg_size = sizeof (struct ib_mad) - send_buf->hdr_len;
 821         seg_size = send_buf->seg_size;
 822         pad = send_wr->pad;
 823
 824         /* Allocate data segments. */
 825         for (left = send_buf->data_len + pad; left > 0; left -= seg_size) {
 826                 seg = kmalloc(sizeof (*seg) + seg_size, gfp_mask);
 827                 if (!seg) {
 828                         printk(KERN_ERR "alloc_send_rmpp_segs: RMPP mem "
 829                                "alloc failed for len %zd, gfp %#x\n",
 830                                sizeof (*seg) + seg_size, gfp_mask);
 831                         free_send_rmpp_list(send_wr);
 832                         return -ENOMEM;
 833                 }
 834                 seg->num = ++send_buf->seg_count;
 835                 list_add_tail(&seg->list, &send_wr->rmpp_list);
 836         }
 837
 838         /* Zero any padding */
 839         if (pad)
 840                 memset(seg->data + seg_size - pad, 0, pad);
 841
 842         rmpp_mad->rmpp_hdr.rmpp_version = send_wr->mad_agent_priv->
 843                                           agent.rmpp_version;
 844         rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA;
 845         ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
 846
 847         send_wr->cur_seg = container_of(send_wr->rmpp_list.next,
 848                                         struct ib_rmpp_segment, list);
 849         send_wr->last_ack_seg = send_wr->cur_seg;
 850         return 0;
 851 }
 852
 853 struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
 854                                             u32 remote_qpn, u16 pkey_index,
 855                                             int rmpp_active,
 856                                             int hdr_len, int data_len,
 857                                             gfp_t gfp_mask)
 858 {
 859         struct ib_mad_agent_private *mad_agent_priv;
 860         struct ib_mad_send_wr_private *mad_send_wr;
 861         int pad, message_size, ret, size;
 862         void *buf;
 863
 864         mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
 865                                       agent);
 866         pad = get_pad_size(hdr_len, data_len);
 867         message_size = hdr_len + data_len + pad;
 868
 869         if ((!mad_agent->rmpp_version &&
 870              (rmpp_active || message_size > sizeof(struct ib_mad))) ||
 871             (!rmpp_active && message_size > sizeof(struct ib_mad)))
 872                 return ERR_PTR(-EINVAL);
 873
 874         size = rmpp_active ? hdr_len : sizeof(struct ib_mad);
 875         buf = kzalloc(sizeof *mad_send_wr + size, gfp_mask);
 876         if (!buf)
 877                 return ERR_PTR(-ENOMEM);
 878
 879         mad_send_wr = buf + size;
 880         INIT_LIST_HEAD(&mad_send_wr->rmpp_list);
 881         mad_send_wr->send_buf.mad = buf;
 882         mad_send_wr->send_buf.hdr_len = hdr_len;
 883         mad_send_wr->send_buf.data_len = data_len;
 884         mad_send_wr->pad = pad;
 885
 886         mad_send_wr->mad_agent_priv = mad_agent_priv;
 887         mad_send_wr->sg_list[0].length = hdr_len;
 888         mad_send_wr->sg_list[0].lkey = mad_agent->mr->lkey;
 889         mad_send_wr->sg_list[1].length = sizeof(struct ib_mad) - hdr_len;
 890         mad_send_wr->sg_list[1].lkey = mad_agent->mr->lkey;
 891
 892         mad_send_wr->send_wr.wr_id = (unsigned long) mad_send_wr;
 893         mad_send_wr->send_wr.sg_list = mad_send_wr->sg_list;
 894         mad_send_wr->send_wr.num_sge = 2;
 895         mad_send_wr->send_wr.opcode = IB_WR_SEND;
 896         mad_send_wr->send_wr.send_flags = IB_SEND_SIGNALED;
 897         mad_send_wr->send_wr.wr.ud.remote_qpn = remote_qpn;
 898         mad_send_wr->send_wr.wr.ud.remote_qkey = IB_QP_SET_QKEY;
 899         mad_send_wr->send_wr.wr.ud.pkey_index = pkey_index;
 900
 901         if (rmpp_active) {
 902                 ret = alloc_send_rmpp_list(mad_send_wr, gfp_mask);
 903                 if (ret) {
 904                         kfree(buf);
 905                         return ERR_PTR(ret);
 906                 }
 907         }
 908
 909         mad_send_wr->send_buf.mad_agent = mad_agent;
 910         atomic_inc(&mad_agent_priv->refcount);
 911         return &mad_send_wr->send_buf;
 912 }
 913 EXPORT_SYMBOL(ib_create_send_mad);
 914
 915 int ib_get_mad_data_offset(u8 mgmt_class)
 916 {
 917         if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM)
 918                 return IB_MGMT_SA_HDR;
 919         else if ((mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
 920                  (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
 921                  (mgmt_class == IB_MGMT_CLASS_BIS))
 922                 return IB_MGMT_DEVICE_HDR;
 923         else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
 924                  (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))
 925                 return IB_MGMT_VENDOR_HDR;
 926         else
 927                 return IB_MGMT_MAD_HDR;
 928 }
 929 EXPORT_SYMBOL(ib_get_mad_data_offset);
 930
 931 int ib_is_mad_class_rmpp(u8 mgmt_class)
 932 {
 933         if ((mgmt_class == IB_MGMT_CLASS_SUBN_ADM) ||
 934             (mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
 935             (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
 936             (mgmt_class == IB_MGMT_CLASS_BIS) ||
 937             ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
 938              (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)))
 939                 return 1;
 940         return 0;
 941 }
 942 EXPORT_SYMBOL(ib_is_mad_class_rmpp);
 943
 944 void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num)
 945 {
 946         struct ib_mad_send_wr_private *mad_send_wr;
 947         struct list_head *list;
 948
 949         mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
 950                                    send_buf);
 951         list = &mad_send_wr->cur_seg->list;
 952
 953         if (mad_send_wr->cur_seg->num < seg_num) {
 954                 list_for_each_entry(mad_send_wr->cur_seg, list, list)
 955                         if (mad_send_wr->cur_seg->num == seg_num)
 956                                 break;
 957         } else if (mad_send_wr->cur_seg->num > seg_num) {
 958                 list_for_each_entry_reverse(mad_send_wr->cur_seg, list, list)
 959                         if (mad_send_wr->cur_seg->num == seg_num)
 960                                 break;
 961         }
 962         return mad_send_wr->cur_seg->data;
 963 }
 964 EXPORT_SYMBOL(ib_get_rmpp_segment);
 965
 966 static inline void *ib_get_payload(struct ib_mad_send_wr_private *mad_send_wr)
 967 {
 968         if (mad_send_wr->send_buf.seg_count)
 969                 return ib_get_rmpp_segment(&mad_send_wr->send_buf,
 970                                            mad_send_wr->seg_num);
 971         else
 972                 return mad_send_wr->send_buf.mad +
 973                        mad_send_wr->send_buf.hdr_len;
 974 }
 975
 976 void ib_free_send_mad(struct ib_mad_send_buf *send_buf)
 977 {
 978         struct ib_mad_agent_private *mad_agent_priv;
 979         struct ib_mad_send_wr_private *mad_send_wr;
 980
 981         mad_agent_priv = container_of(send_buf->mad_agent,
 982                                       struct ib_mad_agent_private, agent);
 983         mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
 984                                    send_buf);
 985
 986         free_send_rmpp_list(mad_send_wr);
 987         kfree(send_buf->mad);
 988         deref_mad_agent(mad_agent_priv);
 989 }
 990 EXPORT_SYMBOL(ib_free_send_mad);
 991
 992 int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr)
 993 {
 994         struct ib_mad_qp_info *qp_info;
 995         struct list_head *list;
 996         struct ib_send_wr *bad_send_wr;
 997         struct ib_mad_agent *mad_agent;
 998         struct ib_sge *sge;
 999         unsigned long flags;
1000         int ret;
1001
1002         /* Set WR ID to find mad_send_wr upon completion */
1003         qp_info = mad_send_wr->mad_agent_priv->qp_info;
1004         mad_send_wr->send_wr.wr_id = (unsigned long)&mad_send_wr->mad_list;
1005         mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;
1006
1007         mad_agent = mad_send_wr->send_buf.mad_agent;
1008         sge = mad_send_wr->sg_list;
1009         sge[0].addr = ib_dma_map_single(mad_agent->device,
1010                                         mad_send_wr->send_buf.mad,
1011                                         sge[0].length,
1012                                         DMA_TO_DEVICE);
1013         mad_send_wr->header_mapping = sge[0].addr;
1014
1015         sge[1].addr = ib_dma_map_single(mad_agent->device,
1016                                         ib_get_payload(mad_send_wr),
1017                                         sge[1].length,
1018                                         DMA_TO_DEVICE);
1019         mad_send_wr->payload_mapping = sge[1].addr;
1020
1021         spin_lock_irqsave(&qp_info->send_queue.lock, flags);
1022         if (qp_info->send_queue.count < qp_info->send_queue.max_active) {
1023                 ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr,
1024                                    &bad_send_wr);
1025                 list = &qp_info->send_queue.list;
1026         } else {
1027                 ret = 0;
1028                 list = &qp_info->overflow_list;
1029         }
1030
1031         if (!ret) {
1032                 qp_info->send_queue.count++;
1033                 list_add_tail(&mad_send_wr->mad_list.list, list);
1034         }
1035         spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
1036         if (ret) {
1037                 ib_dma_unmap_single(mad_agent->device,
1038                                     mad_send_wr->header_mapping,
1039                                     sge[0].length, DMA_TO_DEVICE);
1040                 ib_dma_unmap_single(mad_agent->device,
1041                                     mad_send_wr->payload_mapping,
1042                                     sge[1].length, DMA_TO_DEVICE);
1043         }
1044         return ret;
1045 }
1046
1047 /*
1048  * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
1049  *  with the registered client
1050  */
1051 int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
1052                      struct ib_mad_send_buf **bad_send_buf)
1053 {
1054         struct ib_mad_agent_private *mad_agent_priv;
1055         struct ib_mad_send_buf *next_send_buf;
1056         struct ib_mad_send_wr_private *mad_send_wr;
1057         unsigned long flags;
1058         int ret = -EINVAL;
1059
1060         /* Walk list of send WRs and post each on send list */
1061         for (; send_buf; send_buf = next_send_buf) {
1062
1063                 mad_send_wr = container_of(send_buf,
1064                                            struct ib_mad_send_wr_private,
1065                                            send_buf);
1066                 mad_agent_priv = mad_send_wr->mad_agent_priv;
1067
1068                 if (!send_buf->mad_agent->send_handler ||
1069                     (send_buf->timeout_ms &&
1070                      !send_buf->mad_agent->recv_handler)) {
1071                         ret = -EINVAL;
1072                         goto error;
1073                 }
1074
1075                 if (!ib_is_mad_class_rmpp(((struct ib_mad_hdr *) send_buf->mad)->mgmt_class)) {
1076                         if (mad_agent_priv->agent.rmpp_version) {
1077                                 ret = -EINVAL;
1078                                 goto error;
1079                         }
1080                 }
1081
1082                 /*
1083                  * Save pointer to next work request to post in case the
1084                  * current one completes, and the user modifies the work
1085                  * request associated with the completion
1086                  */
1087                 next_send_buf = send_buf->next;
1088                 mad_send_wr->send_wr.wr.ud.ah = send_buf->ah;
1089
1090                 if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class ==
1091                     IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1092                         ret = handle_outgoing_dr_smp(mad_agent_priv,
1093                                                      mad_send_wr);
1094                         if (ret < 0)            /* error */
1095                                 goto error;
1096                         else if (ret == 1)      /* locally consumed */
1097                                 continue;
1098                 }
1099
1100                 mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid;
1101                 /* Timeout will be updated after send completes */
1102                 mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms);
1103                 mad_send_wr->retries = send_buf->retries;
1104                 /* Reference for work request to QP + response */
1105                 mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0);
1106                 mad_send_wr->status = IB_WC_SUCCESS;
1107
1108                 /* Reference MAD agent until send completes */
1109                 atomic_inc(&mad_agent_priv->refcount);
1110                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1111                 list_add_tail(&mad_send_wr->agent_list,
1112                               &mad_agent_priv->send_list);
1113                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1114
1115                 if (mad_agent_priv->agent.rmpp_version) {
1116                         ret = ib_send_rmpp_mad(mad_send_wr);
1117                         if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED)
1118                                 ret = ib_send_mad(mad_send_wr);
1119                 } else
1120                         ret = ib_send_mad(mad_send_wr);
1121                 if (ret < 0) {
1122                         /* Fail send request */
1123                         spin_lock_irqsave(&mad_agent_priv->lock, flags);
1124                         list_del(&mad_send_wr->agent_list);
1125                         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1126                         atomic_dec(&mad_agent_priv->refcount);
1127                         goto error;
1128                 }
1129         }
1130         return 0;
1131 error:
1132         if (bad_send_buf)
1133                 *bad_send_buf = send_buf;
1134         return ret;
1135 }
1136 EXPORT_SYMBOL(ib_post_send_mad);
1137
1138 /*
1139  * ib_free_recv_mad - Returns data buffers used to receive
1140  *  a MAD to the access layer
1141  */
1142 void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc)
1143 {
1144         struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf;
1145         struct ib_mad_private_header *mad_priv_hdr;
1146         struct ib_mad_private *priv;
1147         struct list_head free_list;
1148
1149         INIT_LIST_HEAD(&free_list);
1150         list_splice_init(&mad_recv_wc->rmpp_list, &free_list);
1151
1152         list_for_each_entry_safe(mad_recv_buf, temp_recv_buf,
1153                                         &free_list, list) {
1154                 mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc,
1155                                            recv_buf);
1156                 mad_priv_hdr = container_of(mad_recv_wc,
1157                                             struct ib_mad_private_header,
1158                                             recv_wc);
1159                 priv = container_of(mad_priv_hdr, struct ib_mad_private,
1160                                     header);
1161                 kmem_cache_free(ib_mad_cache, priv);
1162         }
1163 }
1164 EXPORT_SYMBOL(ib_free_recv_mad);
1165
1166 struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
1167                                         u8 rmpp_version,
1168                                         ib_mad_send_handler send_handler,
1169                                         ib_mad_recv_handler recv_handler,
1170                                         void *context)
1171 {
1172         return ERR_PTR(-EINVAL);        /* XXX: for now */
1173 }
1174 EXPORT_SYMBOL(ib_redirect_mad_qp);
1175
1176 int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
1177                       struct ib_wc *wc)
1178 {
1179         printk(KERN_ERR PFX "ib_process_mad_wc() not implemented yet\n");
1180         return 0;
1181 }
1182 EXPORT_SYMBOL(ib_process_mad_wc);
1183
1184 static int method_in_use(struct ib_mad_mgmt_method_table **method,
1185                          struct ib_mad_reg_req *mad_reg_req)
1186 {
1187         int i;
1188
1189         for (i = find_first_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS);
1190              i < IB_MGMT_MAX_METHODS;
1191              i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1192                                1+i)) {
1193                 if ((*method)->agent[i]) {
1194                         printk(KERN_ERR PFX "Method %d already in use\n", i);
1195                         return -EINVAL;
1196                 }
1197         }
1198         return 0;
1199 }
1200
1201 static int allocate_method_table(struct ib_mad_mgmt_method_table **method)
1202 {
1203         /* Allocate management method table */
1204         *method = kzalloc(sizeof **method, GFP_ATOMIC);
1205         if (!*method) {
1206                 printk(KERN_ERR PFX "No memory for "
1207                        "ib_mad_mgmt_method_table\n");
1208                 return -ENOMEM;
1209         }
1210
1211         return 0;
1212 }
1213
1214 /*
1215  * Check to see if there are any methods still in use
1216  */
1217 static int check_method_table(struct ib_mad_mgmt_method_table *method)
1218 {
1219         int i;
1220
1221         for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
1222                 if (method->agent[i])
1223                         return 1;
1224         return 0;
1225 }
1226
1227 /*
1228  * Check to see if there are any method tables for this class still in use
1229  */
1230 static int check_class_table(struct ib_mad_mgmt_class_table *class)
1231 {
1232         int i;
1233
1234         for (i = 0; i < MAX_MGMT_CLASS; i++)
1235                 if (class->method_table[i])
1236                         return 1;
1237         return 0;
1238 }
1239
1240 static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class)
1241 {
1242         int i;
1243
1244         for (i = 0; i < MAX_MGMT_OUI; i++)
1245                 if (vendor_class->method_table[i])
1246                         return 1;
1247         return 0;
1248 }
1249
1250 static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class,
1251                            char *oui)
1252 {
1253         int i;
1254
1255         for (i = 0; i < MAX_MGMT_OUI; i++)
1256                 /* Is there matching OUI for this vendor class ? */
1257                 if (!memcmp(vendor_class->oui[i], oui, 3))
1258                         return i;
1259
1260         return -1;
1261 }
1262
1263 static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor)
1264 {
1265         int i;
1266
1267         for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++)
1268                 if (vendor->vendor_class[i])
1269                         return 1;
1270
1271         return 0;
1272 }
1273
1274 static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method,
1275                                      struct ib_mad_agent_private *agent)
1276 {
1277         int i;
1278
1279         /* Remove any methods for this mad agent */
1280         for (i = 0; i < IB_MGMT_MAX_METHODS; i++) {
1281                 if (method->agent[i] == agent) {
1282                         method->agent[i] = NULL;
1283                 }
1284         }
1285 }
1286
1287 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1288                               struct ib_mad_agent_private *agent_priv,
1289                               u8 mgmt_class)
1290 {
1291         struct ib_mad_port_private *port_priv;
1292         struct ib_mad_mgmt_class_table **class;
1293         struct ib_mad_mgmt_method_table **method;
1294         int i, ret;
1295
1296         port_priv = agent_priv->qp_info->port_priv;
1297         class = &port_priv->version[mad_reg_req->mgmt_class_version].class;
1298         if (!*class) {
1299                 /* Allocate management class table for "new" class version */
1300                 *class = kzalloc(sizeof **class, GFP_ATOMIC);
1301                 if (!*class) {
1302                         printk(KERN_ERR PFX "No memory for "
1303                                "ib_mad_mgmt_class_table\n");
1304                         ret = -ENOMEM;
1305                         goto error1;
1306                 }
1307
1308                 /* Allocate method table for this management class */
1309                 method = &(*class)->method_table[mgmt_class];
1310                 if ((ret = allocate_method_table(method)))
1311                         goto error2;
1312         } else {
1313                 method = &(*class)->method_table[mgmt_class];
1314                 if (!*method) {
1315                         /* Allocate method table for this management class */
1316                         if ((ret = allocate_method_table(method)))
1317                                 goto error1;
1318                 }
1319         }
1320
1321         /* Now, make sure methods are not already in use */
1322         if (method_in_use(method, mad_reg_req))
1323                 goto error3;
1324
1325         /* Finally, add in methods being registered */
1326         for (i = find_first_bit(mad_reg_req->method_mask,
1327                                 IB_MGMT_MAX_METHODS);
1328              i < IB_MGMT_MAX_METHODS;
1329              i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1330                                1+i)) {
1331                 (*method)->agent[i] = agent_priv;
1332         }
1333         return 0;
1334
1335 error3:
1336         /* Remove any methods for this mad agent */
1337         remove_methods_mad_agent(*method, agent_priv);
1338         /* Now, check to see if there are any methods in use */
1339         if (!check_method_table(*method)) {
1340                 /* If not, release management method table */
1341                 kfree(*method);
1342                 *method = NULL;
1343         }
1344         ret = -EINVAL;
1345         goto error1;
1346 error2:
1347         kfree(*class);
1348         *class = NULL;
1349 error1:
1350         return ret;
1351 }
1352
1353 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
1354                            struct ib_mad_agent_private *agent_priv)
1355 {
1356         struct ib_mad_port_private *port_priv;
1357         struct ib_mad_mgmt_vendor_class_table **vendor_table;
1358         struct ib_mad_mgmt_vendor_class_table *vendor = NULL;
1359         struct ib_mad_mgmt_vendor_class *vendor_class = NULL;
1360         struct ib_mad_mgmt_method_table **method;
1361         int i, ret = -ENOMEM;
1362         u8 vclass;
1363
1364         /* "New" vendor (with OUI) class */
1365         vclass = vendor_class_index(mad_reg_req->mgmt_class);
1366         port_priv = agent_priv->qp_info->port_priv;
1367         vendor_table = &port_priv->version[
1368                                 mad_reg_req->mgmt_class_version].vendor;
1369         if (!*vendor_table) {
1370                 /* Allocate mgmt vendor class table for "new" class version */
1371                 vendor = kzalloc(sizeof *vendor, GFP_ATOMIC);
1372                 if (!vendor) {
1373                         printk(KERN_ERR PFX "No memory for "
1374                                "ib_mad_mgmt_vendor_class_table\n");
1375                         goto error1;
1376                 }
1377
1378                 *vendor_table = vendor;
1379         }
1380         if (!(*vendor_table)->vendor_class[vclass]) {
1381                 /* Allocate table for this management vendor class */
1382                 vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC);
1383                 if (!vendor_class) {
1384                         printk(KERN_ERR PFX "No memory for "
1385                                "ib_mad_mgmt_vendor_class\n");
1386                         goto error2;
1387                 }
1388
1389                 (*vendor_table)->vendor_class[vclass] = vendor_class;
1390         }
1391         for (i = 0; i < MAX_MGMT_OUI; i++) {
1392                 /* Is there matching OUI for this vendor class ? */
1393                 if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i],
1394                             mad_reg_req->oui, 3)) {
1395                         method = &(*vendor_table)->vendor_class[
1396                                                 vclass]->method_table[i];
1397                         BUG_ON(!*method);
1398                         goto check_in_use;
1399                 }
1400         }
1401         for (i = 0; i < MAX_MGMT_OUI; i++) {
1402                 /* OUI slot available ? */
1403                 if (!is_vendor_oui((*vendor_table)->vendor_class[
1404                                 vclass]->oui[i])) {
1405                         method = &(*vendor_table)->vendor_class[
1406                                 vclass]->method_table[i];
1407                         BUG_ON(*method);
1408                         /* Allocate method table for this OUI */
1409                         if ((ret = allocate_method_table(method)))
1410                                 goto error3;
1411                         memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
1412                                mad_reg_req->oui, 3);
1413                         goto check_in_use;
1414                 }
1415         }
1416         printk(KERN_ERR PFX "All OUI slots in use\n");
1417         goto error3;
1418
1419 check_in_use:
1420         /* Now, make sure methods are not already in use */
1421         if (method_in_use(method, mad_reg_req))
1422                 goto error4;
1423
1424         /* Finally, add in methods being registered */
1425         for (i = find_first_bit(mad_reg_req->method_mask,
1426                                 IB_MGMT_MAX_METHODS);
1427              i < IB_MGMT_MAX_METHODS;
1428              i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
1429                                1+i)) {
1430                 (*method)->agent[i] = agent_priv;
1431         }
1432         return 0;
1433
1434 error4:
1435         /* Remove any methods for this mad agent */
1436         remove_methods_mad_agent(*method, agent_priv);
1437         /* Now, check to see if there are any methods in use */
1438         if (!check_method_table(*method)) {
1439                 /* If not, release management method table */
1440                 kfree(*method);
1441                 *method = NULL;
1442         }
1443         ret = -EINVAL;
1444 error3:
1445         if (vendor_class) {
1446                 (*vendor_table)->vendor_class[vclass] = NULL;
1447                 kfree(vendor_class);
1448         }
1449 error2:
1450         if (vendor) {
1451                 *vendor_table = NULL;
1452                 kfree(vendor);
1453         }
1454 error1:
1455         return ret;
1456 }
1457
1458 static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv)
1459 {
1460         struct ib_mad_port_private *port_priv;
1461         struct ib_mad_mgmt_class_table *class;
1462         struct ib_mad_mgmt_method_table *method;
1463         struct ib_mad_mgmt_vendor_class_table *vendor;
1464         struct ib_mad_mgmt_vendor_class *vendor_class;
1465         int index;
1466         u8 mgmt_class;
1467
1468         /*
1469          * Was MAD registration request supplied
1470          * with original registration ?
1471          */
1472         if (!agent_priv->reg_req) {
1473                 goto out;
1474         }
1475
1476         port_priv = agent_priv->qp_info->port_priv;
1477         mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class);
1478         class = port_priv->version[
1479                         agent_priv->reg_req->mgmt_class_version].class;
1480         if (!class)
1481                 goto vendor_check;
1482
1483         method = class->method_table[mgmt_class];
1484         if (method) {
1485                 /* Remove any methods for this mad agent */
1486                 remove_methods_mad_agent(method, agent_priv);
1487                 /* Now, check to see if there are any methods still in use */
1488                 if (!check_method_table(method)) {
1489                         /* If not, release management method table */
1490                          kfree(method);
1491                          class->method_table[mgmt_class] = NULL;
1492                          /* Any management classes left ? */
1493                         if (!check_class_table(class)) {
1494                                 /* If not, release management class table */
1495                                 kfree(class);
1496                                 port_priv->version[
1497                                         agent_priv->reg_req->
1498                                         mgmt_class_version].class = NULL;
1499                         }
1500                 }
1501         }
1502
1503 vendor_check:
1504         if (!is_vendor_class(mgmt_class))
1505                 goto out;
1506
1507         /* normalize mgmt_class to vendor range 2 */
1508         mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class);
1509         vendor = port_priv->version[
1510                         agent_priv->reg_req->mgmt_class_version].vendor;
1511
1512         if (!vendor)
1513                 goto out;
1514
1515         vendor_class = vendor->vendor_class[mgmt_class];
1516         if (vendor_class) {
1517                 index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui);
1518                 if (index < 0)
1519                         goto out;
1520                 method = vendor_class->method_table[index];
1521                 if (method) {
1522                         /* Remove any methods for this mad agent */
1523                         remove_methods_mad_agent(method, agent_priv);
1524                         /*
1525                          * Now, check to see if there are
1526                          * any methods still in use
1527                          */
1528                         if (!check_method_table(method)) {
1529                                 /* If not, release management method table */
1530                                 kfree(method);
1531                                 vendor_class->method_table[index] = NULL;
1532                                 memset(vendor_class->oui[index], 0, 3);
1533                                 /* Any OUIs left ? */
1534                                 if (!check_vendor_class(vendor_class)) {
1535                                         /* If not, release vendor class table */
1536                                         kfree(vendor_class);
1537                                         vendor->vendor_class[mgmt_class] = NULL;
1538                                         /* Any other vendor classes left ? */
1539                                         if (!check_vendor_table(vendor)) {
1540                                                 kfree(vendor);
1541                                                 port_priv->version[
1542                                                         agent_priv->reg_req->
1543                                                         mgmt_class_version].
1544                                                         vendor = NULL;
1545                                         }
1546                                 }
1547                         }
1548                 }
1549         }
1550
1551 out:
1552         return;
1553 }
1554
1555 static struct ib_mad_agent_private *
1556 find_mad_agent(struct ib_mad_port_private *port_priv,
1557                struct ib_mad *mad)
1558 {
1559         struct ib_mad_agent_private *mad_agent = NULL;
1560         unsigned long flags;
1561
1562         spin_lock_irqsave(&port_priv->reg_lock, flags);
1563         if (ib_response_mad(mad)) {
1564                 u32 hi_tid;
1565                 struct ib_mad_agent_private *entry;
1566
1567                 /*
1568                  * Routing is based on high 32 bits of transaction ID
1569                  * of MAD.
1570                  */
1571                 hi_tid = be64_to_cpu(mad->mad_hdr.tid) >> 32;
1572                 list_for_each_entry(entry, &port_priv->agent_list, agent_list) {
1573                         if (entry->agent.hi_tid == hi_tid) {
1574                                 mad_agent = entry;
1575                                 break;
1576                         }
1577                 }
1578         } else {
1579                 struct ib_mad_mgmt_class_table *class;
1580                 struct ib_mad_mgmt_method_table *method;
1581                 struct ib_mad_mgmt_vendor_class_table *vendor;
1582                 struct ib_mad_mgmt_vendor_class *vendor_class;
1583                 struct ib_vendor_mad *vendor_mad;
1584                 int index;
1585
1586                 /*
1587                  * Routing is based on version, class, and method
1588                  * For "newer" vendor MADs, also based on OUI
1589                  */
1590                 if (mad->mad_hdr.class_version >= MAX_MGMT_VERSION)
1591                         goto out;
1592                 if (!is_vendor_class(mad->mad_hdr.mgmt_class)) {
1593                         class = port_priv->version[
1594                                         mad->mad_hdr.class_version].class;
1595                         if (!class)
1596                                 goto out;
1597                         method = class->method_table[convert_mgmt_class(
1598                                                         mad->mad_hdr.mgmt_class)];
1599                         if (method)
1600                                 mad_agent = method->agent[mad->mad_hdr.method &
1601                                                           ~IB_MGMT_METHOD_RESP];
1602                 } else {
1603                         vendor = port_priv->version[
1604                                         mad->mad_hdr.class_version].vendor;
1605                         if (!vendor)
1606                                 goto out;
1607                         vendor_class = vendor->vendor_class[vendor_class_index(
1608                                                 mad->mad_hdr.mgmt_class)];
1609                         if (!vendor_class)
1610                                 goto out;
1611                         /* Find matching OUI */
1612                         vendor_mad = (struct ib_vendor_mad *)mad;
1613                         index = find_vendor_oui(vendor_class, vendor_mad->oui);
1614                         if (index == -1)
1615                                 goto out;
1616                         method = vendor_class->method_table[index];
1617                         if (method) {
1618                                 mad_agent = method->agent[mad->mad_hdr.method &
1619                                                           ~IB_MGMT_METHOD_RESP];
1620                         }
1621                 }
1622         }
1623
1624         if (mad_agent) {
1625                 if (mad_agent->agent.recv_handler)
1626                         atomic_inc(&mad_agent->refcount);
1627                 else {
1628                         printk(KERN_NOTICE PFX "No receive handler for client "
1629                                "%p on port %d\n",
1630                                &mad_agent->agent, port_priv->port_num);
1631                         mad_agent = NULL;
1632                 }
1633         }
1634 out:
1635         spin_unlock_irqrestore(&port_priv->reg_lock, flags);
1636
1637         return mad_agent;
1638 }
1639
1640 static int validate_mad(struct ib_mad *mad, u32 qp_num)
1641 {
1642         int valid = 0;
1643
1644         /* Make sure MAD base version is understood */
1645         if (mad->mad_hdr.base_version != IB_MGMT_BASE_VERSION) {
1646                 printk(KERN_ERR PFX "MAD received with unsupported base "
1647                        "version %d\n", mad->mad_hdr.base_version);
1648                 goto out;
1649         }
1650
1651         /* Filter SMI packets sent to other than QP0 */
1652         if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
1653             (mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
1654                 if (qp_num == 0)
1655                         valid = 1;
1656         } else {
1657                 /* Filter GSI packets sent to QP0 */
1658                 if (qp_num != 0)
1659                         valid = 1;
1660         }
1661
1662 out:
1663         return valid;
1664 }
1665
1666 static int is_data_mad(struct ib_mad_agent_private *mad_agent_priv,
1667                        struct ib_mad_hdr *mad_hdr)
1668 {
1669         struct ib_rmpp_mad *rmpp_mad;
1670
1671         rmpp_mad = (struct ib_rmpp_mad *)mad_hdr;
1672         return !mad_agent_priv->agent.rmpp_version ||
1673                 !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
1674                                     IB_MGMT_RMPP_FLAG_ACTIVE) ||
1675                 (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA);
1676 }
1677
1678 static inline int rcv_has_same_class(struct ib_mad_send_wr_private *wr,
1679                                      struct ib_mad_recv_wc *rwc)
1680 {
1681         return ((struct ib_mad *)(wr->send_buf.mad))->mad_hdr.mgmt_class ==
1682                 rwc->recv_buf.mad->mad_hdr.mgmt_class;
1683 }
1684
1685 static inline int rcv_has_same_gid(struct ib_mad_agent_private *mad_agent_priv,
1686                                    struct ib_mad_send_wr_private *wr,
1687                                    struct ib_mad_recv_wc *rwc )
1688 {
1689         struct ib_ah_attr attr;
1690         u8 send_resp, rcv_resp;
1691         union ib_gid sgid;
1692         struct ib_device *device = mad_agent_priv->agent.device;
1693         u8 port_num = mad_agent_priv->agent.port_num;
1694         u8 lmc;
1695
1696         send_resp = ((struct ib_mad *)(wr->send_buf.mad))->
1697                      mad_hdr.method & IB_MGMT_METHOD_RESP;
1698         rcv_resp = rwc->recv_buf.mad->mad_hdr.method & IB_MGMT_METHOD_RESP;
1699
1700         if (send_resp == rcv_resp)
1701                 /* both requests, or both responses. GIDs different */
1702                 return 0;
1703
1704         if (ib_query_ah(wr->send_buf.ah, &attr))
1705                 /* Assume not equal, to avoid false positives. */
1706                 return 0;
1707
1708         if (!!(attr.ah_flags & IB_AH_GRH) !=
1709             !!(rwc->wc->wc_flags & IB_WC_GRH))
1710                 /* one has GID, other does not.  Assume different */
1711                 return 0;
1712
1713         if (!send_resp && rcv_resp) {
1714                 /* is request/response. */
1715                 if (!(attr.ah_flags & IB_AH_GRH)) {
1716                         if (ib_get_cached_lmc(device, port_num, &lmc))
1717                                 return 0;
1718                         return (!lmc || !((attr.src_path_bits ^
1719                                            rwc->wc->dlid_path_bits) &
1720                                           ((1 << lmc) - 1)));
1721                 } else {
1722                         if (ib_get_cached_gid(device, port_num,
1723                                               attr.grh.sgid_index, &sgid))
1724                                 return 0;
1725                         return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw,
1726                                        16);
1727                 }
1728         }
1729
1730         if (!(attr.ah_flags & IB_AH_GRH))
1731                 return attr.dlid == rwc->wc->slid;
1732         else
1733                 return !memcmp(attr.grh.dgid.raw, rwc->recv_buf.grh->sgid.raw,
1734                                16);
1735 }
1736
1737 static inline int is_direct(u8 class)
1738 {
1739         return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE);
1740 }
1741
1742 struct ib_mad_send_wr_private*
1743 ib_find_send_mad(struct ib_mad_agent_private *mad_agent_priv,
1744                  struct ib_mad_recv_wc *wc)
1745 {
1746         struct ib_mad_send_wr_private *wr;
1747         struct ib_mad *mad;
1748
1749         mad = (struct ib_mad *)wc->recv_buf.mad;
1750
1751         list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) {
1752                 if ((wr->tid == mad->mad_hdr.tid) &&
1753                     rcv_has_same_class(wr, wc) &&
1754                     /*
1755                      * Don't check GID for direct routed MADs.
1756                      * These might have permissive LIDs.
1757                      */
1758                     (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) ||
1759                      rcv_has_same_gid(mad_agent_priv, wr, wc)))
1760                         return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1761         }
1762
1763         /*
1764          * It's possible to receive the response before we've
1765          * been notified that the send has completed
1766          */
1767         list_for_each_entry(wr, &mad_agent_priv->send_list, agent_list) {
1768                 if (is_data_mad(mad_agent_priv, wr->send_buf.mad) &&
1769                     wr->tid == mad->mad_hdr.tid &&
1770                     wr->timeout &&
1771                     rcv_has_same_class(wr, wc) &&
1772                     /*
1773                      * Don't check GID for direct routed MADs.
1774                      * These might have permissive LIDs.
1775                      */
1776                     (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) ||
1777                      rcv_has_same_gid(mad_agent_priv, wr, wc)))
1778                         /* Verify request has not been canceled */
1779                         return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
1780         }
1781         return NULL;
1782 }
1783
1784 void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr)
1785 {
1786         mad_send_wr->timeout = 0;
1787         if (mad_send_wr->refcount == 1)
1788                 list_move_tail(&mad_send_wr->agent_list,
1789                               &mad_send_wr->mad_agent_priv->done_list);
1790 }
1791
1792 static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
1793                                  struct ib_mad_recv_wc *mad_recv_wc)
1794 {
1795         struct ib_mad_send_wr_private *mad_send_wr;
1796         struct ib_mad_send_wc mad_send_wc;
1797         unsigned long flags;
1798
1799         INIT_LIST_HEAD(&mad_recv_wc->rmpp_list);
1800         list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list);
1801         if (mad_agent_priv->agent.rmpp_version) {
1802                 mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv,
1803                                                       mad_recv_wc);
1804                 if (!mad_recv_wc) {
1805                         deref_mad_agent(mad_agent_priv);
1806                         return;
1807                 }
1808         }
1809
1810         /* Complete corresponding request */
1811         if (ib_response_mad(mad_recv_wc->recv_buf.mad)) {
1812                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
1813                 mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc);
1814                 if (!mad_send_wr) {
1815                         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1816                         ib_free_recv_mad(mad_recv_wc);
1817                         deref_mad_agent(mad_agent_priv);
1818                         return;
1819                 }
1820                 ib_mark_mad_done(mad_send_wr);
1821                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
1822
1823                 /* Defined behavior is to complete response before request */
1824                 mad_recv_wc->wc->wr_id = (unsigned long) &mad_send_wr->send_buf;
1825                 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1826                                                    mad_recv_wc);
1827                 atomic_dec(&mad_agent_priv->refcount);
1828
1829                 mad_send_wc.status = IB_WC_SUCCESS;
1830                 mad_send_wc.vendor_err = 0;
1831                 mad_send_wc.send_buf = &mad_send_wr->send_buf;
1832                 ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
1833         } else {
1834                 mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
1835                                                    mad_recv_wc);
1836                 deref_mad_agent(mad_agent_priv);
1837         }
1838 }
1839
1840 static void ib_mad_recv_done_handler(struct ib_mad_port_private *port_priv,
1841                                      struct ib_wc *wc)
1842 {
1843         struct ib_mad_qp_info *qp_info;
1844         struct ib_mad_private_header *mad_priv_hdr;
1845         struct ib_mad_private *recv, *response;
1846         struct ib_mad_list_head *mad_list;
1847         struct ib_mad_agent_private *mad_agent;
1848         int port_num;
1849
1850         response = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
1851         if (!response)
1852                 printk(KERN_ERR PFX "ib_mad_recv_done_handler no memory "
1853                        "for response buffer\n");
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         if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH)
1883                 port_num = wc->port_num;
1884         else
1885                 port_num = port_priv->port_num;
1886
1887         if (recv->mad.mad.mad_hdr.mgmt_class ==
1888             IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
1889                 enum smi_forward_action retsmi;
1890
1891                 if (smi_handle_dr_smp_recv(&recv->mad.smp,
1892                                            port_priv->device->node_type,
1893                                            port_num,
1894                                            port_priv->device->phys_port_cnt) ==
1895                                            IB_SMI_DISCARD)
1896                         goto out;
1897
1898                 retsmi = smi_check_forward_dr_smp(&recv->mad.smp);
1899                 if (retsmi == IB_SMI_LOCAL)
1900                         goto local;
1901
1902                 if (retsmi == IB_SMI_SEND) { /* don't forward */
1903                         if (smi_handle_dr_smp_send(&recv->mad.smp,
1904                                                    port_priv->device->node_type,
1905                                                    port_num) == IB_SMI_DISCARD)
1906                                 goto out;
1907
1908                         if (smi_check_local_smp(&recv->mad.smp, port_priv->device) == IB_SMI_DISCARD)
1909                                 goto out;
1910                 } else if (port_priv->device->node_type == RDMA_NODE_IB_SWITCH) {
1911                         /* forward case for switches */
1912                         memcpy(response, recv, sizeof(*response));
1913                         response->header.recv_wc.wc = &response->header.wc;
1914                         response->header.recv_wc.recv_buf.mad = &response->mad.mad;
1915                         response->header.recv_wc.recv_buf.grh = &response->grh;
1916
1917                         if (!agent_send_response(&response->mad.mad,
1918                                                  &response->grh, wc,
1919                                                  port_priv->device,
1920                                                  smi_get_fwd_port(&recv->mad.smp),
1921                                                  qp_info->qp->qp_num))
1922                                 response = NULL;
1923
1924                         goto out;
1925                 }
1926         }
1927
1928 local:
1929         /* Give driver "right of first refusal" on incoming MAD */
1930         if (port_priv->device->process_mad) {
1931                 int ret;
1932
1933                 if (!response) {
1934                         printk(KERN_ERR PFX "No memory for response MAD\n");
1935                         /*
1936                          * Is it better to assume that
1937                          * it wouldn't be processed ?
1938                          */
1939                         goto out;
1940                 }
1941
1942                 ret = port_priv->device->process_mad(port_priv->device, 0,
1943                                                      port_priv->port_num,
1944                                                      wc, &recv->grh,
1945                                                      &recv->mad.mad,
1946                                                      &response->mad.mad);
1947                 if (ret & IB_MAD_RESULT_SUCCESS) {
1948                         if (ret & IB_MAD_RESULT_CONSUMED)
1949                                 goto out;
1950                         if (ret & IB_MAD_RESULT_REPLY) {
1951                                 agent_send_response(&response->mad.mad,
1952                                                     &recv->grh, wc,
1953                                                     port_priv->device,
1954                                                     port_num,
1955                                                     qp_info->qp->qp_num);
1956                                 goto out;
1957                         }
1958                 }
1959         }
1960
1961         mad_agent = find_mad_agent(port_priv, &recv->mad.mad);
1962         if (mad_agent) {
1963                 ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
1964                 /*
1965                  * recv is freed up in error cases in ib_mad_complete_recv
1966                  * or via recv_handler in ib_mad_complete_recv()
1967                  */
1968                 recv = NULL;
1969         }
1970
1971 out:
1972         /* Post another receive request for this QP */
1973         if (response) {
1974                 ib_mad_post_receive_mads(qp_info, response);
1975                 if (recv)
1976                         kmem_cache_free(ib_mad_cache, recv);
1977         } else
1978                 ib_mad_post_receive_mads(qp_info, recv);
1979 }
1980
1981 static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
1982 {
1983         struct ib_mad_send_wr_private *mad_send_wr;
1984         unsigned long delay;
1985
1986         if (list_empty(&mad_agent_priv->wait_list)) {
1987                 cancel_delayed_work(&mad_agent_priv->timed_work);
1988         } else {
1989                 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
1990                                          struct ib_mad_send_wr_private,
1991                                          agent_list);
1992
1993                 if (time_after(mad_agent_priv->timeout,
1994                                mad_send_wr->timeout)) {
1995                         mad_agent_priv->timeout = mad_send_wr->timeout;
1996                         cancel_delayed_work(&mad_agent_priv->timed_work);
1997                         delay = mad_send_wr->timeout - jiffies;
1998                         if ((long)delay <= 0)
1999                                 delay = 1;
2000                         queue_delayed_work(mad_agent_priv->qp_info->
2001                                            port_priv->wq,
2002                                            &mad_agent_priv->timed_work, delay);
2003                 }
2004         }
2005 }
2006
2007 static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
2008 {
2009         struct ib_mad_agent_private *mad_agent_priv;
2010         struct ib_mad_send_wr_private *temp_mad_send_wr;
2011         struct list_head *list_item;
2012         unsigned long delay;
2013
2014         mad_agent_priv = mad_send_wr->mad_agent_priv;
2015         list_del(&mad_send_wr->agent_list);
2016
2017         delay = mad_send_wr->timeout;
2018         mad_send_wr->timeout += jiffies;
2019
2020         if (delay) {
2021                 list_for_each_prev(list_item, &mad_agent_priv->wait_list) {
2022                         temp_mad_send_wr = list_entry(list_item,
2023                                                 struct ib_mad_send_wr_private,
2024                                                 agent_list);
2025                         if (time_after(mad_send_wr->timeout,
2026                                        temp_mad_send_wr->timeout))
2027                                 break;
2028                 }
2029         }
2030         else
2031                 list_item = &mad_agent_priv->wait_list;
2032         list_add(&mad_send_wr->agent_list, list_item);
2033
2034         /* Reschedule a work item if we have a shorter timeout */
2035         if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list) {
2036                 cancel_delayed_work(&mad_agent_priv->timed_work);
2037                 queue_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
2038                                    &mad_agent_priv->timed_work, delay);
2039         }
2040 }
2041
2042 void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr,
2043                           int timeout_ms)
2044 {
2045         mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2046         wait_for_response(mad_send_wr);
2047 }
2048
2049 /*
2050  * Process a send work completion
2051  */
2052 void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
2053                              struct ib_mad_send_wc *mad_send_wc)
2054 {
2055         struct ib_mad_agent_private     *mad_agent_priv;
2056         unsigned long                   flags;
2057         int                             ret;
2058
2059         mad_agent_priv = mad_send_wr->mad_agent_priv;
2060         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2061         if (mad_agent_priv->agent.rmpp_version) {
2062                 ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc);
2063                 if (ret == IB_RMPP_RESULT_CONSUMED)
2064                         goto done;
2065         } else
2066                 ret = IB_RMPP_RESULT_UNHANDLED;
2067
2068         if (mad_send_wc->status != IB_WC_SUCCESS &&
2069             mad_send_wr->status == IB_WC_SUCCESS) {
2070                 mad_send_wr->status = mad_send_wc->status;
2071                 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2072         }
2073
2074         if (--mad_send_wr->refcount > 0) {
2075                 if (mad_send_wr->refcount == 1 && mad_send_wr->timeout &&
2076                     mad_send_wr->status == IB_WC_SUCCESS) {
2077                         wait_for_response(mad_send_wr);
2078                 }
2079                 goto done;
2080         }
2081
2082         /* Remove send from MAD agent and notify client of completion */
2083         list_del(&mad_send_wr->agent_list);
2084         adjust_timeout(mad_agent_priv);
2085         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2086
2087         if (mad_send_wr->status != IB_WC_SUCCESS )
2088                 mad_send_wc->status = mad_send_wr->status;
2089         if (ret == IB_RMPP_RESULT_INTERNAL)
2090                 ib_rmpp_send_handler(mad_send_wc);
2091         else
2092                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2093                                                    mad_send_wc);
2094
2095         /* Release reference on agent taken when sending */
2096         deref_mad_agent(mad_agent_priv);
2097         return;
2098 done:
2099         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2100 }
2101
2102 static void ib_mad_send_done_handler(struct ib_mad_port_private *port_priv,
2103                                      struct ib_wc *wc)
2104 {
2105         struct ib_mad_send_wr_private   *mad_send_wr, *queued_send_wr;
2106         struct ib_mad_list_head         *mad_list;
2107         struct ib_mad_qp_info           *qp_info;
2108         struct ib_mad_queue             *send_queue;
2109         struct ib_send_wr               *bad_send_wr;
2110         struct ib_mad_send_wc           mad_send_wc;
2111         unsigned long flags;
2112         int ret;
2113
2114         mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2115         mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2116                                    mad_list);
2117         send_queue = mad_list->mad_queue;
2118         qp_info = send_queue->qp_info;
2119
2120 retry:
2121         ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2122                             mad_send_wr->header_mapping,
2123                             mad_send_wr->sg_list[0].length, DMA_TO_DEVICE);
2124         ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
2125                             mad_send_wr->payload_mapping,
2126                             mad_send_wr->sg_list[1].length, DMA_TO_DEVICE);
2127         queued_send_wr = NULL;
2128         spin_lock_irqsave(&send_queue->lock, flags);
2129         list_del(&mad_list->list);
2130
2131         /* Move queued send to the send queue */
2132         if (send_queue->count-- > send_queue->max_active) {
2133                 mad_list = container_of(qp_info->overflow_list.next,
2134                                         struct ib_mad_list_head, list);
2135                 queued_send_wr = container_of(mad_list,
2136                                         struct ib_mad_send_wr_private,
2137                                         mad_list);
2138                 list_move_tail(&mad_list->list, &send_queue->list);
2139         }
2140         spin_unlock_irqrestore(&send_queue->lock, flags);
2141
2142         mad_send_wc.send_buf = &mad_send_wr->send_buf;
2143         mad_send_wc.status = wc->status;
2144         mad_send_wc.vendor_err = wc->vendor_err;
2145         if (atomic_read(&qp_info->snoop_count))
2146                 snoop_send(qp_info, &mad_send_wr->send_buf, &mad_send_wc,
2147                            IB_MAD_SNOOP_SEND_COMPLETIONS);
2148         ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
2149
2150         if (queued_send_wr) {
2151                 ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr,
2152                                    &bad_send_wr);
2153                 if (ret) {
2154                         printk(KERN_ERR PFX "ib_post_send failed: %d\n", ret);
2155                         mad_send_wr = queued_send_wr;
2156                         wc->status = IB_WC_LOC_QP_OP_ERR;
2157                         goto retry;
2158                 }
2159         }
2160 }
2161
2162 static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info)
2163 {
2164         struct ib_mad_send_wr_private *mad_send_wr;
2165         struct ib_mad_list_head *mad_list;
2166         unsigned long flags;
2167
2168         spin_lock_irqsave(&qp_info->send_queue.lock, flags);
2169         list_for_each_entry(mad_list, &qp_info->send_queue.list, list) {
2170                 mad_send_wr = container_of(mad_list,
2171                                            struct ib_mad_send_wr_private,
2172                                            mad_list);
2173                 mad_send_wr->retry = 1;
2174         }
2175         spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
2176 }
2177
2178 static void mad_error_handler(struct ib_mad_port_private *port_priv,
2179                               struct ib_wc *wc)
2180 {
2181         struct ib_mad_list_head *mad_list;
2182         struct ib_mad_qp_info *qp_info;
2183         struct ib_mad_send_wr_private *mad_send_wr;
2184         int ret;
2185
2186         /* Determine if failure was a send or receive */
2187         mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
2188         qp_info = mad_list->mad_queue->qp_info;
2189         if (mad_list->mad_queue == &qp_info->recv_queue)
2190                 /*
2191                  * Receive errors indicate that the QP has entered the error
2192                  * state - error handling/shutdown code will cleanup
2193                  */
2194                 return;
2195
2196         /*
2197          * Send errors will transition the QP to SQE - move
2198          * QP to RTS and repost flushed work requests
2199          */
2200         mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
2201                                    mad_list);
2202         if (wc->status == IB_WC_WR_FLUSH_ERR) {
2203                 if (mad_send_wr->retry) {
2204                         /* Repost send */
2205                         struct ib_send_wr *bad_send_wr;
2206
2207                         mad_send_wr->retry = 0;
2208                         ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr,
2209                                         &bad_send_wr);
2210                         if (ret)
2211                                 ib_mad_send_done_handler(port_priv, wc);
2212                 } else
2213                         ib_mad_send_done_handler(port_priv, wc);
2214         } else {
2215                 struct ib_qp_attr *attr;
2216
2217                 /* Transition QP to RTS and fail offending send */
2218                 attr = kmalloc(sizeof *attr, GFP_KERNEL);
2219                 if (attr) {
2220                         attr->qp_state = IB_QPS_RTS;
2221                         attr->cur_qp_state = IB_QPS_SQE;
2222                         ret = ib_modify_qp(qp_info->qp, attr,
2223                                            IB_QP_STATE | IB_QP_CUR_STATE);
2224                         kfree(attr);
2225                         if (ret)
2226                                 printk(KERN_ERR PFX "mad_error_handler - "
2227                                        "ib_modify_qp to RTS : %d\n", ret);
2228                         else
2229                                 mark_sends_for_retry(qp_info);
2230                 }
2231                 ib_mad_send_done_handler(port_priv, wc);
2232         }
2233 }
2234
2235 /*
2236  * IB MAD completion callback
2237  */
2238 static void ib_mad_completion_handler(struct work_struct *work)
2239 {
2240         struct ib_mad_port_private *port_priv;
2241         struct ib_wc wc;
2242
2243         port_priv = container_of(work, struct ib_mad_port_private, work);
2244         ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2245
2246         while (ib_poll_cq(port_priv->cq, 1, &wc) == 1) {
2247                 if (wc.status == IB_WC_SUCCESS) {
2248                         switch (wc.opcode) {
2249                         case IB_WC_SEND:
2250                                 ib_mad_send_done_handler(port_priv, &wc);
2251                                 break;
2252                         case IB_WC_RECV:
2253                                 ib_mad_recv_done_handler(port_priv, &wc);
2254                                 break;
2255                         default:
2256                                 BUG_ON(1);
2257                                 break;
2258                         }
2259                 } else
2260                         mad_error_handler(port_priv, &wc);
2261         }
2262 }
2263
2264 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
2265 {
2266         unsigned long flags;
2267         struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr;
2268         struct ib_mad_send_wc mad_send_wc;
2269         struct list_head cancel_list;
2270
2271         INIT_LIST_HEAD(&cancel_list);
2272
2273         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2274         list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2275                                  &mad_agent_priv->send_list, agent_list) {
2276                 if (mad_send_wr->status == IB_WC_SUCCESS) {
2277                         mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2278                         mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2279                 }
2280         }
2281
2282         /* Empty wait list to prevent receives from finding a request */
2283         list_splice_init(&mad_agent_priv->wait_list, &cancel_list);
2284         /* Empty local completion list as well */
2285         list_splice_init(&mad_agent_priv->local_list, &cancel_list);
2286         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2287
2288         /* Report all cancelled requests */
2289         mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
2290         mad_send_wc.vendor_err = 0;
2291
2292         list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
2293                                  &cancel_list, agent_list) {
2294                 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2295                 list_del(&mad_send_wr->agent_list);
2296                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2297                                                    &mad_send_wc);
2298                 atomic_dec(&mad_agent_priv->refcount);
2299         }
2300 }
2301
2302 static struct ib_mad_send_wr_private*
2303 find_send_wr(struct ib_mad_agent_private *mad_agent_priv,
2304              struct ib_mad_send_buf *send_buf)
2305 {
2306         struct ib_mad_send_wr_private *mad_send_wr;
2307
2308         list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
2309                             agent_list) {
2310                 if (&mad_send_wr->send_buf == send_buf)
2311                         return mad_send_wr;
2312         }
2313
2314         list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
2315                             agent_list) {
2316                 if (is_data_mad(mad_agent_priv, mad_send_wr->send_buf.mad) &&
2317                     &mad_send_wr->send_buf == send_buf)
2318                         return mad_send_wr;
2319         }
2320         return NULL;
2321 }
2322
2323 int ib_modify_mad(struct ib_mad_agent *mad_agent,
2324                   struct ib_mad_send_buf *send_buf, u32 timeout_ms)
2325 {
2326         struct ib_mad_agent_private *mad_agent_priv;
2327         struct ib_mad_send_wr_private *mad_send_wr;
2328         unsigned long flags;
2329         int active;
2330
2331         mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
2332                                       agent);
2333         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2334         mad_send_wr = find_send_wr(mad_agent_priv, send_buf);
2335         if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) {
2336                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2337                 return -EINVAL;
2338         }
2339
2340         active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1);
2341         if (!timeout_ms) {
2342                 mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
2343                 mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
2344         }
2345
2346         mad_send_wr->send_buf.timeout_ms = timeout_ms;
2347         if (active)
2348                 mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
2349         else
2350                 ib_reset_mad_timeout(mad_send_wr, timeout_ms);
2351
2352         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2353         return 0;
2354 }
2355 EXPORT_SYMBOL(ib_modify_mad);
2356
2357 void ib_cancel_mad(struct ib_mad_agent *mad_agent,
2358                    struct ib_mad_send_buf *send_buf)
2359 {
2360         ib_modify_mad(mad_agent, send_buf, 0);
2361 }
2362 EXPORT_SYMBOL(ib_cancel_mad);
2363
2364 static void local_completions(struct work_struct *work)
2365 {
2366         struct ib_mad_agent_private *mad_agent_priv;
2367         struct ib_mad_local_private *local;
2368         struct ib_mad_agent_private *recv_mad_agent;
2369         unsigned long flags;
2370         int recv = 0;
2371         struct ib_wc wc;
2372         struct ib_mad_send_wc mad_send_wc;
2373
2374         mad_agent_priv =
2375                 container_of(work, struct ib_mad_agent_private, local_work);
2376
2377         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2378         while (!list_empty(&mad_agent_priv->local_list)) {
2379                 local = list_entry(mad_agent_priv->local_list.next,
2380                                    struct ib_mad_local_private,
2381                                    completion_list);
2382                 list_del(&local->completion_list);
2383                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2384                 if (local->mad_priv) {
2385                         recv_mad_agent = local->recv_mad_agent;
2386                         if (!recv_mad_agent) {
2387                                 printk(KERN_ERR PFX "No receive MAD agent for local completion\n");
2388                                 goto local_send_completion;
2389                         }
2390
2391                         recv = 1;
2392                         /*
2393                          * Defined behavior is to complete response
2394                          * before request
2395                          */
2396                         build_smp_wc(recv_mad_agent->agent.qp,
2397                                      (unsigned long) local->mad_send_wr,
2398                                      be16_to_cpu(IB_LID_PERMISSIVE),
2399                                      0, recv_mad_agent->agent.port_num, &wc);
2400
2401                         local->mad_priv->header.recv_wc.wc = &wc;
2402                         local->mad_priv->header.recv_wc.mad_len =
2403                                                 sizeof(struct ib_mad);
2404                         INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list);
2405                         list_add(&local->mad_priv->header.recv_wc.recv_buf.list,
2406                                  &local->mad_priv->header.recv_wc.rmpp_list);
2407                         local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
2408                         local->mad_priv->header.recv_wc.recv_buf.mad =
2409                                                 &local->mad_priv->mad.mad;
2410                         if (atomic_read(&recv_mad_agent->qp_info->snoop_count))
2411                                 snoop_recv(recv_mad_agent->qp_info,
2412                                           &local->mad_priv->header.recv_wc,
2413                                            IB_MAD_SNOOP_RECVS);
2414                         recv_mad_agent->agent.recv_handler(
2415                                                 &recv_mad_agent->agent,
2416                                                 &local->mad_priv->header.recv_wc);
2417                         spin_lock_irqsave(&recv_mad_agent->lock, flags);
2418                         atomic_dec(&recv_mad_agent->refcount);
2419                         spin_unlock_irqrestore(&recv_mad_agent->lock, flags);
2420                 }
2421
2422 local_send_completion:
2423                 /* Complete send */
2424                 mad_send_wc.status = IB_WC_SUCCESS;
2425                 mad_send_wc.vendor_err = 0;
2426                 mad_send_wc.send_buf = &local->mad_send_wr->send_buf;
2427                 if (atomic_read(&mad_agent_priv->qp_info->snoop_count))
2428                         snoop_send(mad_agent_priv->qp_info,
2429                                    &local->mad_send_wr->send_buf,
2430                                    &mad_send_wc, IB_MAD_SNOOP_SEND_COMPLETIONS);
2431                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2432                                                    &mad_send_wc);
2433
2434                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2435                 atomic_dec(&mad_agent_priv->refcount);
2436                 if (!recv)
2437                         kmem_cache_free(ib_mad_cache, local->mad_priv);
2438                 kfree(local);
2439         }
2440         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2441 }
2442
2443 static int retry_send(struct ib_mad_send_wr_private *mad_send_wr)
2444 {
2445         int ret;
2446
2447         if (!mad_send_wr->retries--)
2448                 return -ETIMEDOUT;
2449
2450         mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
2451
2452         if (mad_send_wr->mad_agent_priv->agent.rmpp_version) {
2453                 ret = ib_retry_rmpp(mad_send_wr);
2454                 switch (ret) {
2455                 case IB_RMPP_RESULT_UNHANDLED:
2456                         ret = ib_send_mad(mad_send_wr);
2457                         break;
2458                 case IB_RMPP_RESULT_CONSUMED:
2459                         ret = 0;
2460                         break;
2461                 default:
2462                         ret = -ECOMM;
2463                         break;
2464                 }
2465         } else
2466                 ret = ib_send_mad(mad_send_wr);
2467
2468         if (!ret) {
2469                 mad_send_wr->refcount++;
2470                 list_add_tail(&mad_send_wr->agent_list,
2471                               &mad_send_wr->mad_agent_priv->send_list);
2472         }
2473         return ret;
2474 }
2475
2476 static void timeout_sends(struct work_struct *work)
2477 {
2478         struct ib_mad_agent_private *mad_agent_priv;
2479         struct ib_mad_send_wr_private *mad_send_wr;
2480         struct ib_mad_send_wc mad_send_wc;
2481         unsigned long flags, delay;
2482
2483         mad_agent_priv = container_of(work, struct ib_mad_agent_private,
2484                                       timed_work.work);
2485         mad_send_wc.vendor_err = 0;
2486
2487         spin_lock_irqsave(&mad_agent_priv->lock, flags);
2488         while (!list_empty(&mad_agent_priv->wait_list)) {
2489                 mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
2490                                          struct ib_mad_send_wr_private,
2491                                          agent_list);
2492
2493                 if (time_after(mad_send_wr->timeout, jiffies)) {
2494                         delay = mad_send_wr->timeout - jiffies;
2495                         if ((long)delay <= 0)
2496                                 delay = 1;
2497                         queue_delayed_work(mad_agent_priv->qp_info->
2498                                            port_priv->wq,
2499                                            &mad_agent_priv->timed_work, delay);
2500                         break;
2501                 }
2502
2503                 list_del(&mad_send_wr->agent_list);
2504                 if (mad_send_wr->status == IB_WC_SUCCESS &&
2505                     !retry_send(mad_send_wr))
2506                         continue;
2507
2508                 spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2509
2510                 if (mad_send_wr->status == IB_WC_SUCCESS)
2511                         mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR;
2512                 else
2513                         mad_send_wc.status = mad_send_wr->status;
2514                 mad_send_wc.send_buf = &mad_send_wr->send_buf;
2515                 mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
2516                                                    &mad_send_wc);
2517
2518                 atomic_dec(&mad_agent_priv->refcount);
2519                 spin_lock_irqsave(&mad_agent_priv->lock, flags);
2520         }
2521         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
2522 }
2523
2524 static void ib_mad_thread_completion_handler(struct ib_cq *cq, void *arg)
2525 {
2526         struct ib_mad_port_private *port_priv = cq->cq_context;
2527         unsigned long flags;
2528
2529         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2530         if (!list_empty(&port_priv->port_list))
2531                 queue_work(port_priv->wq, &port_priv->work);
2532         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2533 }
2534
2535 /*
2536  * Allocate receive MADs and post receive WRs for them
2537  */
2538 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
2539                                     struct ib_mad_private *mad)
2540 {
2541         unsigned long flags;
2542         int post, ret;
2543         struct ib_mad_private *mad_priv;
2544         struct ib_sge sg_list;
2545         struct ib_recv_wr recv_wr, *bad_recv_wr;
2546         struct ib_mad_queue *recv_queue = &qp_info->recv_queue;
2547
2548         /* Initialize common scatter list fields */
2549         sg_list.length = sizeof *mad_priv - sizeof mad_priv->header;
2550         sg_list.lkey = (*qp_info->port_priv->mr).lkey;
2551
2552         /* Initialize common receive WR fields */
2553         recv_wr.next = NULL;
2554         recv_wr.sg_list = &sg_list;
2555         recv_wr.num_sge = 1;
2556
2557         do {
2558                 /* Allocate and map receive buffer */
2559                 if (mad) {
2560                         mad_priv = mad;
2561                         mad = NULL;
2562                 } else {
2563                         mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
2564                         if (!mad_priv) {
2565                                 printk(KERN_ERR PFX "No memory for receive buffer\n");
2566                                 ret = -ENOMEM;
2567                                 break;
2568                         }
2569                 }
2570                 sg_list.addr = ib_dma_map_single(qp_info->port_priv->device,
2571                                                  &mad_priv->grh,
2572                                                  sizeof *mad_priv -
2573                                                    sizeof mad_priv->header,
2574                                                  DMA_FROM_DEVICE);
2575                 mad_priv->header.mapping = sg_list.addr;
2576                 recv_wr.wr_id = (unsigned long)&mad_priv->header.mad_list;
2577                 mad_priv->header.mad_list.mad_queue = recv_queue;
2578
2579                 /* Post receive WR */
2580                 spin_lock_irqsave(&recv_queue->lock, flags);
2581                 post = (++recv_queue->count < recv_queue->max_active);
2582                 list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list);
2583                 spin_unlock_irqrestore(&recv_queue->lock, flags);
2584                 ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr);
2585                 if (ret) {
2586                         spin_lock_irqsave(&recv_queue->lock, flags);
2587                         list_del(&mad_priv->header.mad_list.list);
2588                         recv_queue->count--;
2589                         spin_unlock_irqrestore(&recv_queue->lock, flags);
2590                         ib_dma_unmap_single(qp_info->port_priv->device,
2591                                             mad_priv->header.mapping,
2592                                             sizeof *mad_priv -
2593                                               sizeof mad_priv->header,
2594                                             DMA_FROM_DEVICE);
2595                         kmem_cache_free(ib_mad_cache, mad_priv);
2596                         printk(KERN_ERR PFX "ib_post_recv failed: %d\n", ret);
2597                         break;
2598                 }
2599         } while (post);
2600
2601         return ret;
2602 }
2603
2604 /*
2605  * Return all the posted receive MADs
2606  */
2607 static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info)
2608 {
2609         struct ib_mad_private_header *mad_priv_hdr;
2610         struct ib_mad_private *recv;
2611         struct ib_mad_list_head *mad_list;
2612
2613         while (!list_empty(&qp_info->recv_queue.list)) {
2614
2615                 mad_list = list_entry(qp_info->recv_queue.list.next,
2616                                       struct ib_mad_list_head, list);
2617                 mad_priv_hdr = container_of(mad_list,
2618                                             struct ib_mad_private_header,
2619                                             mad_list);
2620                 recv = container_of(mad_priv_hdr, struct ib_mad_private,
2621                                     header);
2622
2623                 /* Remove from posted receive MAD list */
2624                 list_del(&mad_list->list);
2625
2626                 ib_dma_unmap_single(qp_info->port_priv->device,
2627                                     recv->header.mapping,
2628                                     sizeof(struct ib_mad_private) -
2629                                       sizeof(struct ib_mad_private_header),
2630                                     DMA_FROM_DEVICE);
2631                 kmem_cache_free(ib_mad_cache, recv);
2632         }
2633
2634         qp_info->recv_queue.count = 0;
2635 }
2636
2637 /*
2638  * Start the port
2639  */
2640 static int ib_mad_port_start(struct ib_mad_port_private *port_priv)
2641 {
2642         int ret, i;
2643         struct ib_qp_attr *attr;
2644         struct ib_qp *qp;
2645
2646         attr = kmalloc(sizeof *attr, GFP_KERNEL);
2647         if (!attr) {
2648                 printk(KERN_ERR PFX "Couldn't kmalloc ib_qp_attr\n");
2649                 return -ENOMEM;
2650         }
2651
2652         for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2653                 qp = port_priv->qp_info[i].qp;
2654                 /*
2655                  * PKey index for QP1 is irrelevant but
2656                  * one is needed for the Reset to Init transition
2657                  */
2658                 attr->qp_state = IB_QPS_INIT;
2659                 attr->pkey_index = 0;
2660                 attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY;
2661                 ret = ib_modify_qp(qp, attr, IB_QP_STATE |
2662                                              IB_QP_PKEY_INDEX | IB_QP_QKEY);
2663                 if (ret) {
2664                         printk(KERN_ERR PFX "Couldn't change QP%d state to "
2665                                "INIT: %d\n", i, ret);
2666                         goto out;
2667                 }
2668
2669                 attr->qp_state = IB_QPS_RTR;
2670                 ret = ib_modify_qp(qp, attr, IB_QP_STATE);
2671                 if (ret) {
2672                         printk(KERN_ERR PFX "Couldn't change QP%d state to "
2673                                "RTR: %d\n", i, ret);
2674                         goto out;
2675                 }
2676
2677                 attr->qp_state = IB_QPS_RTS;
2678                 attr->sq_psn = IB_MAD_SEND_Q_PSN;
2679                 ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN);
2680                 if (ret) {
2681                         printk(KERN_ERR PFX "Couldn't change QP%d state to "
2682                                "RTS: %d\n", i, ret);
2683                         goto out;
2684                 }
2685         }
2686
2687         ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
2688         if (ret) {
2689                 printk(KERN_ERR PFX "Failed to request completion "
2690                        "notification: %d\n", ret);
2691                 goto out;
2692         }
2693
2694         for (i = 0; i < IB_MAD_QPS_CORE; i++) {
2695                 ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
2696                 if (ret) {
2697                         printk(KERN_ERR PFX "Couldn't post receive WRs\n");
2698                         goto out;
2699                 }
2700         }
2701 out:
2702         kfree(attr);
2703         return ret;
2704 }
2705
2706 static void qp_event_handler(struct ib_event *event, void *qp_context)
2707 {
2708         struct ib_mad_qp_info   *qp_info = qp_context;
2709
2710         /* It's worse than that! He's dead, Jim! */
2711         printk(KERN_ERR PFX "Fatal error (%d) on MAD QP (%d)\n",
2712                 event->event, qp_info->qp->qp_num);
2713 }
2714
2715 static void init_mad_queue(struct ib_mad_qp_info *qp_info,
2716                            struct ib_mad_queue *mad_queue)
2717 {
2718         mad_queue->qp_info = qp_info;
2719         mad_queue->count = 0;
2720         spin_lock_init(&mad_queue->lock);
2721         INIT_LIST_HEAD(&mad_queue->list);
2722 }
2723
2724 static void init_mad_qp(struct ib_mad_port_private *port_priv,
2725                         struct ib_mad_qp_info *qp_info)
2726 {
2727         qp_info->port_priv = port_priv;
2728         init_mad_queue(qp_info, &qp_info->send_queue);
2729         init_mad_queue(qp_info, &qp_info->recv_queue);
2730         INIT_LIST_HEAD(&qp_info->overflow_list);
2731         spin_lock_init(&qp_info->snoop_lock);
2732         qp_info->snoop_table = NULL;
2733         qp_info->snoop_table_size = 0;
2734         atomic_set(&qp_info->snoop_count, 0);
2735 }
2736
2737 static int create_mad_qp(struct ib_mad_qp_info *qp_info,
2738                          enum ib_qp_type qp_type)
2739 {
2740         struct ib_qp_init_attr  qp_init_attr;
2741         int ret;
2742
2743         memset(&qp_init_attr, 0, sizeof qp_init_attr);
2744         qp_init_attr.send_cq = qp_info->port_priv->cq;
2745         qp_init_attr.recv_cq = qp_info->port_priv->cq;
2746         qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
2747         qp_init_attr.cap.max_send_wr = IB_MAD_QP_SEND_SIZE;
2748         qp_init_attr.cap.max_recv_wr = IB_MAD_QP_RECV_SIZE;
2749         qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG;
2750         qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG;
2751         qp_init_attr.qp_type = qp_type;
2752         qp_init_attr.port_num = qp_info->port_priv->port_num;
2753         qp_init_attr.qp_context = qp_info;
2754         qp_init_attr.event_handler = qp_event_handler;
2755         qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr);
2756         if (IS_ERR(qp_info->qp)) {
2757                 printk(KERN_ERR PFX "Couldn't create ib_mad QP%d\n",
2758                        get_spl_qp_index(qp_type));
2759                 ret = PTR_ERR(qp_info->qp);
2760                 goto error;
2761         }
2762         /* Use minimum queue sizes unless the CQ is resized */
2763         qp_info->send_queue.max_active = IB_MAD_QP_SEND_SIZE;
2764         qp_info->recv_queue.max_active = IB_MAD_QP_RECV_SIZE;
2765         return 0;
2766
2767 error:
2768         return ret;
2769 }
2770
2771 static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
2772 {
2773         ib_destroy_qp(qp_info->qp);
2774         kfree(qp_info->snoop_table);
2775 }
2776
2777 /*
2778  * Open the port
2779  * Create the QP, PD, MR, and CQ if needed
2780  */
2781 static int ib_mad_port_open(struct ib_device *device,
2782                             int port_num)
2783 {
2784         int ret, cq_size;
2785         struct ib_mad_port_private *port_priv;
2786         unsigned long flags;
2787         char name[sizeof "ib_mad123"];
2788
2789         /* Create new device info */
2790         port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
2791         if (!port_priv) {
2792                 printk(KERN_ERR PFX "No memory for ib_mad_port_private\n");
2793                 return -ENOMEM;
2794         }
2795
2796         port_priv->device = device;
2797         port_priv->port_num = port_num;
2798         spin_lock_init(&port_priv->reg_lock);
2799         INIT_LIST_HEAD(&port_priv->agent_list);
2800         init_mad_qp(port_priv, &port_priv->qp_info[0]);
2801         init_mad_qp(port_priv, &port_priv->qp_info[1]);
2802
2803         cq_size = (IB_MAD_QP_SEND_SIZE + IB_MAD_QP_RECV_SIZE) * 2;
2804         port_priv->cq = ib_create_cq(port_priv->device,
2805                                      ib_mad_thread_completion_handler,
2806                                      NULL, port_priv, cq_size, 0);
2807         if (IS_ERR(port_priv->cq)) {
2808                 printk(KERN_ERR PFX "Couldn't create ib_mad CQ\n");
2809                 ret = PTR_ERR(port_priv->cq);
2810                 goto error3;
2811         }
2812
2813         port_priv->pd = ib_alloc_pd(device);
2814         if (IS_ERR(port_priv->pd)) {
2815                 printk(KERN_ERR PFX "Couldn't create ib_mad PD\n");
2816                 ret = PTR_ERR(port_priv->pd);
2817                 goto error4;
2818         }
2819
2820         port_priv->mr = ib_get_dma_mr(port_priv->pd, IB_ACCESS_LOCAL_WRITE);
2821         if (IS_ERR(port_priv->mr)) {
2822                 printk(KERN_ERR PFX "Couldn't get ib_mad DMA MR\n");
2823                 ret = PTR_ERR(port_priv->mr);
2824                 goto error5;
2825         }
2826
2827         ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
2828         if (ret)
2829                 goto error6;
2830         ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI);
2831         if (ret)
2832                 goto error7;
2833
2834         snprintf(name, sizeof name, "ib_mad%d", port_num);
2835         port_priv->wq = create_singlethread_workqueue(name);
2836         if (!port_priv->wq) {
2837                 ret = -ENOMEM;
2838                 goto error8;
2839         }
2840         INIT_WORK(&port_priv->work, ib_mad_completion_handler);
2841
2842         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2843         list_add_tail(&port_priv->port_list, &ib_mad_port_list);
2844         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2845
2846         ret = ib_mad_port_start(port_priv);
2847         if (ret) {
2848                 printk(KERN_ERR PFX "Couldn't start port\n");
2849                 goto error9;
2850         }
2851
2852         return 0;
2853
2854 error9:
2855         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2856         list_del_init(&port_priv->port_list);
2857         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2858
2859         destroy_workqueue(port_priv->wq);
2860 error8:
2861         destroy_mad_qp(&port_priv->qp_info[1]);
2862 error7:
2863         destroy_mad_qp(&port_priv->qp_info[0]);
2864 error6:
2865         ib_dereg_mr(port_priv->mr);
2866 error5:
2867         ib_dealloc_pd(port_priv->pd);
2868 error4:
2869         ib_destroy_cq(port_priv->cq);
2870         cleanup_recv_queue(&port_priv->qp_info[1]);
2871         cleanup_recv_queue(&port_priv->qp_info[0]);
2872 error3:
2873         kfree(port_priv);
2874
2875         return ret;
2876 }
2877
2878 /*
2879  * Close the port
2880  * If there are no classes using the port, free the port
2881  * resources (CQ, MR, PD, QP) and remove the port's info structure
2882  */
2883 static int ib_mad_port_close(struct ib_device *device, int port_num)
2884 {
2885         struct ib_mad_port_private *port_priv;
2886         unsigned long flags;
2887
2888         spin_lock_irqsave(&ib_mad_port_list_lock, flags);
2889         port_priv = __ib_get_mad_port(device, port_num);
2890         if (port_priv == NULL) {
2891                 spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2892                 printk(KERN_ERR PFX "Port %d not found\n", port_num);
2893                 return -ENODEV;
2894         }
2895         list_del_init(&port_priv->port_list);
2896         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
2897
2898         destroy_workqueue(port_priv->wq);
2899         destroy_mad_qp(&port_priv->qp_info[1]);
2900         destroy_mad_qp(&port_priv->qp_info[0]);
2901         ib_dereg_mr(port_priv->mr);
2902         ib_dealloc_pd(port_priv->pd);
2903         ib_destroy_cq(port_priv->cq);
2904         cleanup_recv_queue(&port_priv->qp_info[1]);
2905         cleanup_recv_queue(&port_priv->qp_info[0]);
2906         /* XXX: Handle deallocation of MAD registration tables */
2907
2908         kfree(port_priv);
2909
2910         return 0;
2911 }
2912
2913 static void ib_mad_init_device(struct ib_device *device)
2914 {
2915         int start, end, i;
2916
2917         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
2918                 return;
2919
2920         if (device->node_type == RDMA_NODE_IB_SWITCH) {
2921                 start = 0;
2922                 end   = 0;
2923         } else {
2924                 start = 1;
2925                 end   = device->phys_port_cnt;
2926         }
2927
2928         for (i = start; i <= end; i++) {
2929                 if (ib_mad_port_open(device, i)) {
2930                         printk(KERN_ERR PFX "Couldn't open %s port %d\n",
2931                                device->name, i);
2932                         goto error;
2933                 }
2934                 if (ib_agent_port_open(device, i)) {
2935                         printk(KERN_ERR PFX "Couldn't open %s port %d "
2936                                "for agents\n",
2937                                device->name, i);
2938                         goto error_agent;
2939                 }
2940         }
2941         return;
2942
2943 error_agent:
2944         if (ib_mad_port_close(device, i))
2945                 printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2946                        device->name, i);
2947
2948 error:
2949         i--;
2950
2951         while (i >= start) {
2952                 if (ib_agent_port_close(device, i))
2953                         printk(KERN_ERR PFX "Couldn't close %s port %d "
2954                                "for agents\n",
2955                                device->name, i);
2956                 if (ib_mad_port_close(device, i))
2957                         printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2958                                device->name, i);
2959                 i--;
2960         }
2961 }
2962
2963 static void ib_mad_remove_device(struct ib_device *device)
2964 {
2965         int i, num_ports, cur_port;
2966
2967         if (device->node_type == RDMA_NODE_IB_SWITCH) {
2968                 num_ports = 1;
2969                 cur_port = 0;
2970         } else {
2971                 num_ports = device->phys_port_cnt;
2972                 cur_port = 1;
2973         }
2974         for (i = 0; i < num_ports; i++, cur_port++) {
2975                 if (ib_agent_port_close(device, cur_port))
2976                         printk(KERN_ERR PFX "Couldn't close %s port %d "
2977                                "for agents\n",
2978                                device->name, cur_port);
2979                 if (ib_mad_port_close(device, cur_port))
2980                         printk(KERN_ERR PFX "Couldn't close %s port %d\n",
2981                                device->name, cur_port);
2982         }
2983 }
2984
2985 static struct ib_client mad_client = {
2986         .name   = "mad",
2987         .add = ib_mad_init_device,
2988         .remove = ib_mad_remove_device
2989 };
2990
2991 static int __init ib_mad_init_module(void)
2992 {
2993         int ret;
2994
2995         spin_lock_init(&ib_mad_port_list_lock);
2996
2997         ib_mad_cache = kmem_cache_create("ib_mad",
2998                                          sizeof(struct ib_mad_private),
2999                                          0,
3000                                          SLAB_HWCACHE_ALIGN,
3001                                          NULL,
3002                                          NULL);
3003         if (!ib_mad_cache) {
3004                 printk(KERN_ERR PFX "Couldn't create ib_mad cache\n");
3005                 ret = -ENOMEM;
3006                 goto error1;
3007         }
3008
3009         INIT_LIST_HEAD(&ib_mad_port_list);
3010
3011         if (ib_register_client(&mad_client)) {
3012                 printk(KERN_ERR PFX "Couldn't register ib_mad client\n");
3013                 ret = -EINVAL;
3014                 goto error2;
3015         }
3016
3017         return 0;
3018
3019 error2:
3020         kmem_cache_destroy(ib_mad_cache);
3021 error1:
3022         return ret;
3023 }
3024
3025 static void __exit ib_mad_cleanup_module(void)
3026 {
3027         ib_unregister_client(&mad_client);
3028         kmem_cache_destroy(ib_mad_cache);
3029 }
3030
3031 module_init(ib_mad_init_module);
3032 module_exit(ib_mad_cleanup_module);
3033